JP2009180189A - Compressor manufacturing method - Google Patents

Abstract

An object of the present invention is to provide a compressor manufacturing method capable of realizing cost reduction by reducing the amount of material used without significantly increasing raw material costs.
In the compressor manufacturing method according to the present invention, in the first internal component preparation step, first internal components 23 and 824 having first welds 23b and 824w on the outer periphery are prepared. In the second internal component preparation step, second internal components 24 and 825 having second welds 24d and 825w on the outer periphery are prepared. In the butting process, the first internal part and the second internal part are butted so that the first welded part and the second welded part come into contact with each other. In the joining step, the first welded part and the second welded part are laser welded to join the first internal part and the second internal part.
[Selection] Figure 2

Description

  The present invention relates to a method for manufacturing a compressor.

Today, compressor manufacturing sites are required to reduce the amount of materials used for the purpose of cost reduction. In response to this requirement, a proposal has been made in the past that “laser welding or electron beam welding is used instead of bolt fastening as a fixing method of internal parts (for example, a fixed scroll, a housing, etc.) of the compressor”. Certainly, if laser welding or electron beam welding is used in this way, the bolting allowance of internal parts can be eliminated, and the thickness of the fastening part of the internal parts can be made thin by taking advantage of low distortion joining. Therefore, the amount of material used for the internal parts can be reduced.
Japanese Patent Laid-Open No. 2-204693

  However, when laser welding or electron beam welding is performed on an internal part made of flake graphite cast iron such as FC250, many small cracks are generated in the welded part, which causes a problem in the quality of the internal part after welding. On the other hand, in order to perform laser welding and electron beam welding without defects, it is sufficient to form the internal parts from low-carbon steel. The effect cannot be fully enjoyed, and the seizure resistance deteriorates when applied to an internal part that involves sliding.

  An object of the present invention is to provide a compressor capable of fastening internal parts without causing quality problems, and reducing the amount of material used without significantly increasing raw material costs, thereby realizing cost reduction. It is to provide a manufacturing method.

  The compressor manufacturing method according to the first aspect of the present invention includes a first internal component preparation step, a second internal component preparation step, a butting step, and a joining step. In the present invention, the first internal component preparation step and the second internal component preparation step may be performed before or after, or may be performed simultaneously. In the first internal component preparation step, a first internal component is prepared. The first internal component has a first main body portion and a first welded portion. A 1st main-body part consists of "the cast iron which has a carbon content of 3.0 weight%-4.0 weight% and is difficult to laser-weld." Here, “a cast iron difficult to laser weld having a carbon content of 3.0 wt% to 4.0 wt%” is a cast iron in which defects such as minute cracks occur during laser welding. Specifically, it is flake graphite cast iron, spheroidal graphite cast iron, and the like. The first weld consists of “low carbon steel having a carbon content of less than 0.3% by weight” or “laser weldable cast iron having a carbon content of 2.0% to 2.7% by weight”. . Such parts can be formed by a technique such as casting. And this 1st welding part is integrally provided with the 1st main-body part in at least one part of the outer periphery of a 1st main-body part. In the second internal component preparation step, a second internal component is prepared. The “internal parts” referred to here are, for example, a fixed scroll and a housing of a scroll compressor, a head and a cylinder of a rotary compressor, and the like. The second internal part has a second main body portion and a second welded portion. The second main body portion may be made of “laser-weld cast iron having a carbon content of 3.0% by weight to 4.0% by weight” or “a carbon content of less than 0.3% by weight”. It may consist of “low carbon steel” or “laser weldable cast iron having a carbon content of 2.0 wt% to 2.7 wt%”. The second weld consists of “low carbon steel with a carbon content of less than 0.3% by weight” or “laser weldable cast iron with a carbon content of 2.0% to 2.7% by weight”. . The “laser-weldable cast iron having a carbon content of 2.0 wt% to 2.7 wt%” is cast iron that does not cause defects such as minute cracks during laser welding. Cast iron composing articles molded by semi-molten or semi-solid die-casting method (resulting in heat treatment of chilled molded product to obtain desired strength and structure, resulting in fine spherical crystals of carbon component) Cast iron dispersed in the components). In addition, when a 2nd main-body part and a 2nd welding part are formed with a different material, a 2nd internal component can be formed by methods, such as casting. And this 2nd welding part is integrally provided with a 2nd main-body part in at least one part of the outer periphery of a 2nd main-body part. In the butting process, the first internal part and the second internal part are butted so that the first welded part and the second welded part come into contact with each other. In the joining step, the first welded part and the second welded part are laser welded to join the first internal part and the second internal part.

  In this compressor manufacturing method, laser welding is used for fastening the first internal part and the second internal part. For this reason, if the manufacturing method of this compressor is utilized, while the bolting allowance of an internal component can be excluded, the thickness of the fastening part of an internal component can be made thin using the advantage of low distortion joining. . Therefore, if the manufacturing method of this compressor is utilized, the usage-amount of the material of an internal component can be reduced. Further, in this compressor manufacturing method, the first main body portion of the first internal part is made of “cast iron difficult to weld by laser having a carbon content of 3.0 wt% to 4.0 wt%”, and the first welding. “Low carbon steel with a carbon content of less than 0.3% by weight” or “laser weldable cast iron with a carbon content of 2.0% to 2.7% by weight”, which is expensive only in the part, is used. The For this reason, if this compressor manufacturing method is used, the amount of material used can be reduced and the cost can be reduced without significantly increasing the raw material cost. Further, when the first main body portion is a sliding portion, the occurrence of seizure can be sufficiently suppressed. In this compressor manufacturing method, both the first welded portion and the second welded portion are “low carbon steel having a carbon content of less than 0.3 wt%” or “2.0 wt% to 2.7 wt%. Is formed from a laser-weldable cast iron having a carbon content of%. For this reason, if this compressor manufacturing method is used, the first internal part and the second internal part can be fastened without causing a quality problem.

  As described above, if this compressor manufacturing method is used, internal parts can be fastened without causing quality problems, and the amount of materials used can be reduced without significantly increasing the cost of raw materials, thereby reducing costs. Can be realized.

  In the present invention, when the internal component is a fixed scroll or a housing of the scroll compressor, the diameter of the scroll compressor can be reduced. For this reason, other inner portions can be made smaller, and further cost reduction can be realized.

  The compressor manufacturing method according to the second invention is the compressor manufacturing method according to the first invention, wherein the second main body portion has a carbon content of “3.0 wt% to 4.0 wt%. It consists of cast iron that is difficult to laser weld.

  For this reason, if the manufacturing method of this compressor is utilized, the raise of raw material cost can further be suppressed. Therefore, if this compressor manufacturing method is used, the effect of cost reduction can be made more remarkable.

  A compressor manufacturing method according to a third aspect of the present invention is the compressor manufacturing method according to the first or second aspect of the present invention, wherein the first welded portion has an annular shape. Moreover, the 2nd welding part is exhibiting the cyclic | annular form. And in a joining process, the 1st welding part and the 2nd welding part are laser-welded over the perimeter, and the 1st internal part and the 2nd internal part are joined.

  For this reason, if the manufacturing method of this compressor is utilized, the sealing performance of a 1st internal component and a 2nd internal component can be ensured.

  A compressor manufacturing method according to a fourth aspect of the present invention includes a first internal component preparation step, a second internal component preparation step, a butting step, a pin insertion step, and a fixing step. In the present invention, the matching step and the pin insertion step may be performed simultaneously. In the first internal component preparation step, a first internal component is prepared. The first internal component has a main body portion, a welded portion, and a first through hole. The main body may be made of “a cast iron difficult to laser weld having a carbon content of 3.0 wt% to 4.0 wt%” or “a low content having a carbon content of less than 0.3 wt%. It may consist of “carbon steel” or “laser-weldable cast iron having a carbon content of 2.0% to 2.7% by weight”. The weld consists of “low carbon steel with a carbon content of less than 0.3% by weight” or “laser weldable cast iron with a carbon content of 2.0% to 2.7% by weight”. In addition, when a main-body part and a welding part are formed with a different material, a 1st internal component can be formed by methods, such as casting. And this welding part is integrally provided with the main-body part in at least one part of the outer periphery of a main-body part. The first through hole penetrates the welded portion. In the second internal component preparation step, a second internal component is prepared. The “internal parts” referred to here are, for example, a fixed scroll and a housing of a scroll compressor, a head and a cylinder of a rotary compressor, and the like. The second internal part consists of “cast iron difficult to laser weld with a carbon content of 3.0 wt% to 4.0 wt%”. And this 2nd internal component has a 2nd through-hole. In the butting step, the first internal component and the second internal component are butted so that the first through hole and the second through hole communicate with each other. In the pin insertion process, at least the small diameter portion can be “low carbon steel having a carbon content of less than 0.3 wt%” or “laser weldable having a carbon content of 2.0 wt% to 2.7 wt%” The insertion pin made of “cast iron” is inserted into the first through hole and the second through hole so that the small diameter portion is located on the first internal component side and the large diameter portion is located on the second internal component side. In the fixing step, the welded portion and the small-diameter portion of the insertion pin are laser welded to fix the second internal component to the first internal component. The “insertion pin” here is, for example, a rivet or a taper pin. When the insertion pin is a rivet, the small diameter portion is the main body portion and the large diameter portion is the head portion.

  In this compressor manufacturing method, the small-diameter portion of the insertion pin and the welded portion of the first internal component are fastened by laser welding while the second internal component is supported by the large-diameter portion of the insertion pin. For this reason, in this compressor manufacturing method, the insertion cost of the insertion pin is required, but the engagement cost of the insertion pin is smaller than that of the bolt. Therefore, if this compressor manufacturing method is used, the thickness of the fastening part of the internal part can be reduced by taking advantage of the low strain bonding. Therefore, if the manufacturing method of this compressor is utilized, the usage-amount of the material of an internal component can be reduced. Further, in this compressor manufacturing method, the second internal component is made of “cast iron that has a carbon content of 3.0 wt% to 4.0 wt% and is difficult to laser weld”. For this reason, if this compressor manufacturing method is used, the amount of material used can be reduced and the cost can be reduced without significantly increasing the raw material cost. Moreover, when the main body part and the second internal part of the first internal part are sliding parts, the occurrence of seizure can be sufficiently suppressed. Moreover, in this compressor manufacturing method, both the welded portion and the small diameter portion of the insertion pin are “low carbon steel having a carbon content of less than 0.3 wt%” or “2.0 wt% to 2.7 wt%. Is formed from a laser-weldable cast iron having a carbon content of%. For this reason, if this compressor manufacturing method is used, the first internal part and the second internal part can be fastened without causing a quality problem. Further, in this compressor manufacturing method, a pin insertion step is provided. For this reason, if the manufacturing method of this compressor is utilized, the fastening position of a 1st internal component and a 2nd internal component can be stabilized.

  As described above, if this compressor manufacturing method is used, internal parts can be fastened without causing quality problems, and the amount of materials used can be reduced without significantly increasing the cost of raw materials, thereby reducing costs. Can be realized.

  In the present invention, when the internal component is a fixed scroll or a housing of the scroll compressor, the diameter of the scroll compressor can be reduced. For this reason, other inner portions can be made smaller, and further cost reduction can be realized.

  A compressor manufacturing method according to a fifth invention is the compressor manufacturing method according to the fourth invention, wherein the insertion pin tapers from the end of the second through hole toward the end of the first through hole. This is a taper pin. Further, the first through hole and the second through hole have a shape corresponding to the shape of the insertion pin.

  A compressor manufacturing method according to a sixth aspect of the present invention is the compressor manufacturing method according to the fourth aspect of the present invention, wherein the insertion pin is a rivet having a head on the second through hole side. The head of the rivet may be accommodated in the second internal part, or may be outside the second internal part.

  A compressor manufacturing method according to a seventh aspect of the present invention includes a first internal component preparation step, a second internal component preparation step, a butting step, and a fixing step. In the first internal component preparation step, a first internal component is prepared. The first internal part consists of “a cast iron difficult to laser weld with a carbon content of 3.0 wt% to 4.0 wt%”. And this 1st internal component has a 1st main-body part and a collar part. The brim portion is provided on one side of the first main body portion. Further, the brim portion is provided so as to protrude outward from the outer periphery of the first main body portion. In the second internal component preparation step, a second internal component is prepared. The “internal parts” referred to here are, for example, a fixed scroll and a housing of a scroll compressor, a head and a cylinder of a rotary compressor, and the like. The second internal part consists of “cast iron difficult to laser weld with a carbon content of 3.0 wt% to 4.0 wt%”. And this 1st internal component has a 2nd main-body part, a wall part, and a recessed part. The wall portion is erected on the outer peripheral portion of the second main body portion. The recess opens on the inner peripheral surface of the wall. In the butting step, the first internal component and the second internal component are butted so that the concave portion opposes the vicinity of the boundary between the main body portion and the flange portion. In the fixing step, the melted solution obtained by melting the melted material is infiltrated into the recesses and contacted with the flanges, and then the melted solution is solidified so that the first internal component becomes the second internal component. Fixed. The filler material is melted by arc discharge, gas, plasma, electron beam, laser light or the like.

  In this compressor manufacturing method, the melt is infiltrated into the recess and is brought into contact with the flange, and then the melt is solidified and the first internal component is fixed to the second internal component. For this reason, if the manufacturing method of this compressor is utilized, while the bolting allowance of an internal component can be excluded, the thickness of the fastening part of an internal component can be made thin using the advantage of low distortion joining. . Therefore, if the manufacturing method of this compressor is utilized, the usage-amount of the material of an internal component can be reduced. Moreover, in this compressor manufacturing method, the first internal part and the second internal part are both made of “cast iron difficult to laser weld having a carbon content of 3.0 wt% to 4.0 wt%”. For this reason, if this compressor manufacturing method is used, the amount of material used can be reduced and the cost can be reduced without significantly increasing the raw material cost. Further, when the first internal part and the second internal part are sliding parts, the occurrence of seizure can be sufficiently suppressed. In the compressor manufacturing method, the first internal component and the second internal component are not directly laser-welded. For this reason, if this compressor manufacturing method is used, the first internal part and the second internal part can be fastened without causing a quality problem.

  As described above, if this compressor manufacturing method is used, internal parts can be fastened without causing quality problems, and the amount of materials used can be reduced without significantly increasing the cost of raw materials, thereby reducing costs. Can be realized.

  In the present invention, when the internal component is a fixed scroll or a housing of the scroll compressor, the diameter of the scroll compressor can be reduced. For this reason, other inner portions can be made smaller, and further cost reduction can be realized.

  By using the compressor manufacturing method according to the first invention, internal parts can be fastened without causing quality problems, and the amount of material used can be reduced without significantly increasing raw material costs, thereby reducing costs. Can be realized. In the present invention, when the internal component is a fixed scroll or a housing of the scroll compressor, the diameter of the scroll compressor can be reduced. For this reason, other inner portions can be made smaller, and further cost reduction can be realized.

  If the method for manufacturing a compressor according to the second invention is used, the increase in raw material costs can be further suppressed. Therefore, if this compressor manufacturing method is used, the effect of cost reduction can be made more remarkable.

  If the manufacturing method of the compressor concerning the 3rd invention is used, the seal nature of the 1st internal parts and the 2nd internal parts can be secured.

  By using the compressor manufacturing method according to the fourth aspect of the invention, internal parts can be fastened without causing quality problems, and the amount of material used can be reduced without significantly increasing raw material costs, thereby reducing costs. Can be realized. In the present invention, when the internal component is a fixed scroll or a housing of the scroll compressor, the diameter of the scroll compressor can be reduced. For this reason, other inner portions can be made smaller, and further cost reduction can be realized.

  If the compressor manufacturing method according to the seventh invention is used, internal parts can be fastened without causing quality problems, and the amount of material used can be reduced without significantly increasing raw material costs, thereby reducing costs. Can be realized. In the present invention, when the internal component is a fixed scroll or a housing of the scroll compressor, the diameter of the scroll compressor can be reduced. For this reason, other inner portions can be made smaller, and further cost reduction can be realized.

-First embodiment-
The high / low pressure dome type scroll compressor 1 according to the first embodiment of the present invention constitutes a refrigerant circuit together with an evaporator, a condenser, an expansion mechanism, and the like, and plays a role of compressing a gas refrigerant in the refrigerant circuit. As shown in FIG. 1, mainly, a substantially cylindrical sealed dome-shaped casing 10, a scroll compression mechanism 15, an Oldham ring 39, a crankshaft 17, a drive motor 16, a lower main bearing 60, and a suction pipe. 19 and a discharge pipe 20. Hereinafter, the components of the high / low pressure dome type scroll compressor 1 will be described in detail.

<Details of components of high-low pressure dome type scroll compressor>
(1) Casing The casing 10 is welded to the substantially cylindrical trunk casing portion 11, the bowl-shaped upper wall portion 12 welded to the upper end of the trunk casing portion 11, and the lower end of the trunk casing portion 11. And a bowl-shaped bottom wall portion 13. The casing 10 mainly accommodates a scroll compression mechanism 15 that compresses a gas refrigerant and a drive motor 16 that is disposed below the scroll compression mechanism 15. The scroll compression mechanism 15 and the drive motor 16 are connected by a crankshaft 17 arranged so as to extend in the vertical direction in the casing 10. As a result, a gap space 18 is generated between the scroll compression mechanism 15 and the drive motor 16.

(2) Scroll Compression Mechanism As shown in FIG. 1, the scroll compression mechanism 15 mainly includes a housing 23, a fixed scroll 24 disposed in close contact with the housing 23, and a movable meshing with the fixed scroll 24. And a scroll 26. Hereinafter, the components of the scroll compression mechanism 15 will be described in detail.

a) Housing As shown in FIG. 2, the housing 23 is mainly composed of a main body portion 23 a and an annular welded portion 23 b provided at the upper end of the outer periphery of the main body portion 23 a so as to protrude outward from the outer periphery of the main body portion 23 a. It consists of. In the present embodiment, the main body portion 23a is formed by casting from FC250 flake graphite cast iron, and the welded portion 23b is formed from cast iron having a relatively low carbon content by semi-molten die casting. . In addition, this welding part 23b is integrated with the main-body part 23a. A method of integrating the welded portion 23b with the main body portion 23a will be described in detail later.

  As shown in FIG. 1, the housing 23 is press-fitted and fixed to the body casing portion 11 over the entire outer circumferential surface of the main body portion 23 a in the circumferential direction. That is, the body casing part 11 and the housing 23 are in close contact with each other in an airtight manner over the entire circumference. For this reason, the inside of the casing 10 is partitioned into a high pressure space 28 below the housing 23 and a low pressure space 29 above the housing 23. The main body 23a is formed with a housing recess 31 that is recessed at the center of the upper surface and a bearing 32 that extends downward from the center of the lower surface. A bearing hole 33 penetrating in the vertical direction is formed in the bearing portion 32, and the main shaft portion 17 b of the crankshaft 17 is rotatably fitted in the bearing hole 33 via a bearing 34.

b) Fixed Scroll The fixed scroll 24 mainly includes an end plate 24a, a spiral (involute) wrap 24b formed on the lower surface of the end plate 24a, an outer peripheral wall 24c surrounding the wrap 24b, and an outer peripheral lower end of the outer peripheral wall 24c. And a welded portion 24d provided so as to protrude outward from the outer periphery of the outer peripheral wall 24c. A discharge passage 41 that communicates with the compression chamber 40 (described later) and an enlarged recess 42 that communicates with the discharge passage 41 are formed in the end plate 24a. The discharge passage 41 is formed so as to extend in the vertical direction at the central portion of the end plate 24a. The enlarged recess 42 is recessed on the upper surface of the end plate 24a. A lid 44 is fastened and fixed to the upper surface of the fixed scroll 24 by bolts 44 a so as to close the enlarged concave portion 42. And the expansion chamber 42, ie, the muffler space 45, which silences the operation sound of the scroll compression mechanism 15 by covering the enlarged recess 42 with the lid 44 is formed. The fixed scroll 24 and the lid 44 are sealed by being brought into close contact via a packing (not shown).

  In the present embodiment, the welded portion 24d is formed from cast iron having a relatively low carbon content by a semi-molten die-casting method. Is attached) by casting from FC250 flake graphite cast iron. The welded portion 24d is integrated with the outer peripheral wall 24c. A method of integrating the welded portion 24d with the outer peripheral wall 24c will be described in detail later.

c) Movable Scroll The movable scroll 26 mainly includes an end plate 26a, a spiral (involute) wrap 26b formed on the upper surface of the end plate 26a, a bearing portion 26c formed on the lower surface of the end plate 26a, and the end plate 26a. It is comprised from the groove part (not shown) formed in the both ends. The movable scroll 26 is supported by the housing 23 by fitting an Oldham ring 39 into the groove. Further, the eccentric shaft portion 17a of the crankshaft 17 is fitted into the bearing portion 26c. The movable scroll 26 revolves in the housing 23 without being rotated by the rotation of the crankshaft 17 by being incorporated in the scroll compression mechanism 15 in this way. The wrap 26b of the movable scroll 26 is meshed with the wrap 24b of the fixed scroll 24, and a compression chamber 40 is formed between the contact portions of both the wraps 24b and 26b. In the compression chamber 40, the volume between the laps 24b and 26b contracts toward the center as the movable scroll 26 revolves. In the high-low pressure dome type scroll compressor 1 according to the present embodiment, the gas refrigerant is compressed in this way.

d) Others In the scroll compression mechanism 15, a communication passage 46 is formed across the fixed scroll 24 and the housing 23. The communication passage 46 is formed so that a scroll-side passage 47 formed in the fixed scroll 24 and a housing-side passage 48 formed in the housing 23 communicate with each other. The upper end of the communication passage 46, that is, the upper end of the scroll side passage 47 opens into the enlarged recess 42, and the lower end of the communication passage 46, that is, the lower end of the housing side passage 48 opens into the lower end surface of the housing 23. In other words, the lower end opening of the housing side passage 48 constitutes a discharge port 49 through which the refrigerant in the communication passage 46 flows out into the gap space 18.

(3) Oldham ring The Oldham ring 39 is a member for preventing the rotational movement of the movable scroll 26 as described above, and is fitted into an Oldham groove (not shown) formed in the housing 23. The Oldham groove is an oval groove and is disposed at a position facing each other in the housing 23.

(4) Crankshaft As shown in FIG. 1, the crankshaft 17 is a substantially cylindrical integrally formed part, and mainly includes an eccentric shaft portion 17 a, a main shaft portion 17 b, a balance weight portion 17 c, and a countershaft portion 17 d. It has. The eccentric shaft portion 17 a is accommodated in the bearing portion 26 c of the movable scroll 26. The main shaft portion 17 b is accommodated in the bearing hole 33 of the housing 23 via the bearing 34. The auxiliary shaft portion 17d is accommodated in the lower main bearing 60.

(5) Drive Motor The drive motor 16 is a DC motor in the present embodiment, and mainly includes an annular stator 51 fixed to the inner wall surface of the casing 10 and a slight gap (air gap) inside the stator 51. The rotor 52 is rotatably accommodated with a passage). The drive motor 16 is arranged such that the upper end of the coil end 53 formed on the upper side of the stator 51 is at substantially the same height as the lower end of the bearing portion 32 of the housing 23.

  In the stator 51, a copper wire is wound around a tooth portion, and a coil end 53 is formed above and below. Further, the outer peripheral surface of the stator 51 is provided with core cut portions that are notched at a plurality of locations from the upper end surface to the lower end surface of the stator 51 and at predetermined intervals in the circumferential direction. The core cut portion forms a motor cooling passage 55 extending in the vertical direction between the body casing portion 11 and the stator 51.

  The rotor 52 is drivably coupled to the movable scroll 26 of the scroll compression mechanism 15 via a crankshaft 17 that is disposed in the axial center of the trunk casing 11 so as to extend in the vertical direction. A guide plate 58 that guides the refrigerant that has flowed out of the discharge port 49 of the communication passage 46 to the motor cooling passage 55 is disposed in the gap space 18.

(6) Lower Main Bearing The lower main bearing 60 is disposed in the lower space below the drive motor 16. The lower main bearing 60 is fixed to the body casing portion 11 and constitutes a lower end bearing of the crankshaft 17 and supports the auxiliary shaft portion 17d of the crankshaft 17.

(7) Suction Pipe The suction pipe 19 is for guiding the refrigerant in the refrigerant circuit to the scroll compression mechanism 15 and is fitted into the upper wall portion 12 of the casing 10 in an airtight manner. The suction pipe 19 penetrates the low pressure space 29 in the vertical direction, and an inner end portion is fitted into the fixed scroll 24.

(8) Discharge pipe The discharge pipe 20 is for discharging the refrigerant in the casing 10 to the outside of the casing 10, and is fitted into the body casing portion 11 of the casing 10 in an airtight manner. The discharge pipe 20 has an inner end 36 that is formed in a cylindrical shape extending in the vertical direction and is fixed to the lower end of the housing 23. The inner end opening of the discharge pipe 20, that is, the inflow port, is opened downward.

<Method for Manufacturing Welded Portion of Housing and Welded Portion of Fixed Scroll>
In the present embodiment, the welded portion 23b of the housing 23 and the welded portion 24d of the fixed scroll 24 are manufactured by the following manufacturing method.

(1) Raw material In this Embodiment, as an iron raw material used as the raw material of the welding parts 23b and 24d, C: 2.3-2.4 wt%, Si: 1.95-2.05 wt%, Mn: 0.6 A billet to which ~ 0.7 wt%, P: <0.035 wt%, S: <0.04 wt%, Cr: 0.00 to 0.50 wt%, Ni: 0.50 to 1.00 wt% is added. Adopted. In addition, the weight ratio here is a ratio with respect to the whole quantity. Here, the “billet” means a material before final molding which is formed into a cylindrical shape or the like by a continuous casting apparatus after the iron material having the above components is melted in a melting furnace. Here, the C and Si contents are such that the tensile strength and tensile modulus are higher than those of flake graphite cast iron, and a component base having a complicated shape (the one before becoming the final component) is molded. It is determined to satisfy both of the appropriate fluidity to do. The content of Ni is determined so as to constitute a metal composition suitable for improving the toughness of the metal structure and preventing surface cracks during molding.

(2) Manufacturing process The welds 23b and 24d are manufactured through a semi-molten die-cast molding process, a heat treatment process, and a final finishing process. Hereinafter, each process is explained in full detail.

a) Semi-molten die-cast molding process In the semi-molten die-cast molding process, first, the billet is heated to a high frequency to be in a semi-molten state. Next, when the billet in the semi-molten state is poured into a predetermined mold, the billet is formed into a desired shape while applying a predetermined pressure with a die casting machine to obtain a weld base. Then, when the weld base is taken out of the mold and rapidly cooled, the metal structure of the weld base is entirely whitened. The welded portion base is slightly larger than the finally obtained welded portions 23b and 24d, and the welded portion base becomes a final welded portion in which a machining allowance is removed in a subsequent final finishing step.

b) Heat treatment step In the heat treatment step, the weld base after the semi-molten die casting step is heat treated. In this heat treatment step, the metal structure of the weld base changes from a whitened structure to a metal structure composed of pearlite / ferrite matrix and granular graphite. The graphitization and pearlization of the whitened structure can be adjusted by adjusting the heat treatment temperature, holding time, cooling rate, and the like. For example, as described in Honda R & D Technical Review Vol.14 No.1 paper "Study on the semi-melting technology of iron", cooling at 0.05 to 0.10 ° C / sec after holding at 950 ° C for 60 minutes By slowly cooling in the furnace at a speed, tensile strength of about 500 MPa to 700 MPa, HB150 (HRB81 (converted value from SAE J417 hardness conversion table)) to HB200 (HRB96 (SAE J417 hardness conversion table) A metal structure having a hardness of the order of conversion))) can be obtained. Such a metal structure is soft and excellent in machinability because it has a ferrite center, but there is a possibility of forming a cutting edge during machining and reducing the tool life. In addition, after holding at 1000 ° C. for 60 minutes, air cooling, and further holding for a predetermined time at a temperature slightly lower than the initial temperature and then air cooling, tensile strength of about 600 MPa to 900 MPa, HB200 (HRB96 (SAE J 417 hardness conversion) Conversion value from table)) to HB250 (HRB105, HRC26 (conversion value from SAE J417 hardness conversion table, HRB105 is a reference value because it exceeds the effective practical range of the test type))) A metal structure can be obtained. In such a metal structure, those having hardness equivalent to flake graphite cast iron have machinability equivalent to flake graphite cast iron, and machinability compared to spheroidal graphite cast iron having equivalent ductility and toughness. Is excellent. In addition, by holding the oil at 1000 ° C. for 60 minutes, cooling with oil, and holding the air at a temperature slightly lower than the initial temperature for a predetermined time and then cooling with air, tensile strength of about 800 MPa to 1300 MPa, HB250 (HRB105, HRC26 (SAE J 417 Conversion value from hardness conversion table, HRB105 is a reference value because it exceeds the effective practical range of test type))-HB350 (HRB122, HRC41 (converted value from SAE J417 hardness conversion table, HRB122) It is possible to obtain a metal structure having a hardness of a reference level because it exceeds the effective practical range of the test type. Such a metal structure is hard because it has a pearlite center and is inferior in machinability, but has excellent wear resistance.

c) Final Finishing Process In the final finishing process, the weld base is machined to complete the welds 23b and 24d. Note that the welds 23b and 24d thus manufactured do not cause minute cracks or the like even when irradiated with laser light. In the present embodiment, the standard value of the center line surface roughness (Ra) of the lower surface Ps2 (see FIG. 2) of the welded portion 24d of the fixed scroll 24 is 0.6 to 1.2 μm, and the flatness The standard value is set to 0.01 to 0.03 mm. The standard value of the center line surface roughness (Ra) of the upper surface Ps1 (see FIG. 2) of the welded portion 23b of the housing 23 is 0.6 to 1.2 μm, and the standard value of flatness is 0.01. It is set to -0.03mm. Furthermore, 0.07 mm chamfering is performed on the outer peripheral end of the lower surface Ps2 of the welded portion 24d of the fixed scroll 24 and the outer peripheral end of the upper surface Ps1 of the welded portion 23b of the housing 23 as shown in FIG.

<Method for Manufacturing Fixed Scroll and Housing>
The housing 23 and the fixed scroll 24 are molded from cast iron of FC250 by a sand casting method. In addition, hot water is poured into the sand mold in a state where the welded portions 23b and 24d are previously charged at predetermined positions, and respective base bodies are formed. Then, after roughing these substrates, finishing is performed to obtain the housing 23 and the fixed scroll 24. If it does in this way, the fixed scroll 24 with which the housing 23 in which the welding part 23b was integrated with the main-body part 23a and the welding part 24d was integrated with the main-body part 24M can be obtained.

<Method of joining housing and fixed scroll>
In the present embodiment, the housing 23 and the fixed scroll 24 are fastened not by bolting but by laser welding as shown in FIGS. Specifically, after incorporating the crankshaft 17, the movable scroll 26, the Oldham ring 39, etc. into the housing 23, the upper surface Ps1 of the welded portion 23b of the housing 23 and the lower surface Ps2 of the welded portion 24d of the fixed scroll 24 are brought into contact with each other. In a state where the housing 23 and the fixed scroll 24 are pressed from both sides, a fiber laser beam LS having a spot diameter of φ0.3 mm is irradiated so as to sandwich the contact surface between the lower surface Ps2 and the upper surface Ps1. At this time, the irradiation position of the fiber laser beam LS is the upper side of the chamfered surface of the welded portion 24d of the fixed scroll 24 or the lower side of the chamfered surface of the welded portion 23b of the housing 23 when viewed along the laser beam irradiation direction. This line is adjusted as a reference line. Further, the output / welding speed of the fiber laser beam LS is adjusted so that the heat input amount per unit length in the welding progress direction is 50 ± 5 (J / mm). Moreover, in this Embodiment, the contact surface is laser-welded over the perimeter. In the present embodiment, laser welding is performed from the outer periphery to the inner periphery. That is, the entire contact surface is laser welded.

<Flow of gas refrigerant during operation of high / low pressure dome type scroll compressor>
When the drive motor 16 is driven, the crankshaft 17 rotates, and the revolving operation is performed without rotating the movable scroll. Then, the low-pressure gas refrigerant is sucked into the compression chamber 40 from the peripheral side of the compression chamber 40 through the suction pipe 19 and is compressed as the volume of the compression chamber 40 changes, and becomes a high-pressure gas refrigerant. The high-pressure gas refrigerant is discharged from the central portion of the compression chamber 40 through the discharge passage 41 to the muffler space 45, and then passes through the communication passage 46, the scroll side passage 47, the housing side passage 48, and the discharge port 49. Then, it flows out into the gap space 18 and flows downward between the guide plate 58 and the inner surface of the body casing portion 11. When the gas refrigerant flows downward between the guide plate 58 and the inner surface of the body casing portion 11, a part of the gas refrigerant is diverted to form a circle between the guide plate 58 and the drive motor 16. Flow in the direction. At this time, the lubricating oil mixed in the gas refrigerant is separated. On the other hand, the other part of the diverted gas refrigerant flows downward in the motor cooling passage 55, flows to the lower motor space, and then reverses to become an air gap passage between the stator 51 and the rotor 52, or to communicate therewith. It flows upward through the motor cooling passage 55 on the side facing the passage 46 (left side in FIG. 1). Thereafter, the gas refrigerant that has passed through the guide plate 58 and the gas refrigerant that has flowed through the air gap passage or the motor cooling passage 55 merge in the gap space 18 and flow into the discharge pipe 20 from the inner end 36 of the discharge pipe 20. And discharged outside the casing 10. The gas refrigerant discharged to the outside of the casing 10 circulates through the refrigerant circuit, and is again sucked into the scroll compression mechanism 15 through the suction pipe 19 and compressed.

<Characteristics of the high and low pressure dome type scroll compressor according to the first embodiment>
(1)
In the manufacture of the high and low pressure dome type scroll compressor 1 according to the first embodiment, laser welding is used for fastening the housing 23 and the fixed scroll 24 instead of bolt fastening. For this reason, in the high and low pressure dome type scroll compressor 1, the bolting allowance is eliminated from the housing 23 and the fixed scroll 24, and the thickness of the fastening portion of the housing 23 and the fixed scroll 24 is reduced. Therefore, in the high-low pressure dome type scroll compressor 1, the amount of material used for the housing 23 and the fixed scroll 24 is reduced and the diameter is reduced.

(2)
In the manufacture of the high and low pressure dome type scroll compressor 1 according to the first embodiment, the main body portion 23b of the housing 23 and the main body portion 24M of the fixed scroll 24 are formed of cast iron of FC250. For this reason, in this high and low pressure dome type scroll compressor 1, material cost is suppressed and seizure resistance is sufficiently secured.

(3)
In the high-low pressure dome-type scroll compressor 1 according to the first embodiment, the welded portion 23b of the housing 23 and the welded portion 24d of the fixed scroll 24 are both semi-molten die from cast iron having a carbon content of 2.3 to 2.4 wt%. Molded by the cast molding method. Parts manufactured in this manner do not cause minute cracks even when irradiated with laser light. For this reason, in the high-low pressure dome type scroll compressor 1, the housing 23 and the fixed scroll 24 are well welded.

(4)
In the high-low pressure dome-type scroll compressor 1 according to the first embodiment, when laser welding the welded portions 23b and 24d, the heat input per unit length in the welding direction is 50 ± 5 (J / mm). The output of the fiber laser beam LS and the welding speed are adjusted. For this reason, in this high and low pressure dome type scroll compressor 1, the tensile strength of the laser welded portion W can be maintained at 80% or more, and 0.4 to 0.5 (fatigue limit / cast iron in the plane bending test). Strength).

(5)
In the high and low pressure dome type scroll compressor 1 according to the first embodiment, fiber laser light LS is used when laser welding the welded portions 23b and 24d. For this reason, in this high and low pressure dome type scroll compressor 1, since deep penetration is obtained at the time of laser welding, low heat input joining becomes possible.

(6)
In the high and low pressure dome type scroll compressor 1 according to the first embodiment, fiber laser light LS having a spot diameter of φ0.3 mm is used in laser welding. For this reason, in this high-low pressure dome-type scroll compressor 1, it is possible to prevent poor penetration due to misalignment of the welding position.

(7)
In the high and low pressure dome type scroll compressor 1 according to the first embodiment, the standard value of the center line surface roughness (Ra) of the lower surface Ps2 of the welded portion 24d of the fixed scroll 24 and the upper surface Ps1 of the welded portion 23b of the housing 23 is 0. The standard value of flatness is 0.01 to 0.03 mm. For this reason, in this high-low pressure dome-type scroll compressor 1, it is possible to prevent welding defects while maintaining performance and reliability.

(8)
In the high and low pressure dome type scroll compressor 1 according to the first embodiment, the contact surfaces of the welded portions 23b and 24d are laser welded over the entire circumference. For this reason, in this high-low pressure dome-type scroll compressor 1, a reliable seal can be achieved as compared with the bolt fastening, and an improvement in performance can be expected. Therefore, the high-low pressure dome type scroll compressor 1 can compress a high-pressure refrigerant such as carbon dioxide.

(9)
In the high and low pressure dome type scroll compressor 1 according to the first embodiment, the contact portion between the upper surface Ps1 of the welded portion 23b of the housing 23 and the lower surface Ps2 of the welded portion 24d of the fixed scroll 24 is directly laser-welded. For this reason, in this high and low pressure dome type scroll compressor 1, the welding quality of the housing 23 and the fixed scroll 24 can be made high.

(10)
In the high and low pressure dome type scroll compressor 1 according to the first embodiment, almost all of the contact portion between the upper surface Ps1 of the welded portion 23b of the housing 23 and the lower surface Ps2 of the welded portion 24d of the fixed scroll 24 is laser-welded. . For this reason, in this high and low pressure dome type scroll compressor 1, the starting point of fatigue failure can be eliminated. Therefore, the high-low pressure dome type scroll compressor 1 can compress a high-pressure refrigerant such as carbon dioxide.

(11)
In the high-low pressure dome type scroll compressor 1 according to the first embodiment, no filler material is used in performing laser welding. For this reason, the high and low pressure dome type scroll compressor 1 can be provided to the market at a low cost.

(12)
In the high and low pressure dome-type scroll compressor 1 according to the first embodiment, when the irradiation position of the fiber laser light LS is viewed along the laser light irradiation direction, the upper side of the chamfered surface of the welded portion 24d of the fixed scroll 24 or the housing. 23, the lower line of the chamfered surface of the welded portion 23b is adjusted as a reference line. And this chamfer is 1/4 or less of the spot diameter of a fiber laser beam. For this reason, in this high-low pressure dome-type scroll compressor 1, it is possible to prevent laser beam position shift and focus position shift.

<Modification of First Embodiment>
(A)
In the previous embodiment, the hermetic type high / low pressure dome type scroll compressor 1 is employed. However, the compressor may be a high pressure dome type compressor or a low pressure dome type compressor. Moreover, a semi-hermetic type or an open type compressor may be used.

(B)
In the high-low pressure dome type scroll compressor 1 according to the previous embodiment, the Oldham ring 39 is employed as the rotation prevention mechanism, but a pin, a ball coupling, a crank, or the like may be employed as the rotation prevention mechanism.

(C)
In the previous embodiment, the case where the high / low pressure dome type scroll compressor 1 is used in the refrigerant circuit has been described as an example. However, the application is not limited to air conditioning, and is used alone or incorporated in a system. A compressor, a blower, a supercharger, a pump, or the like may be used.

(D)
The high and low pressure dome type scroll compressor 1 according to the previous embodiment has a lubricating oil, but it is an oilless or oil-free (no need to have oil) type compressor, blower, and supercharger. It may be a pump.

(E)
In the high and low pressure dome type scroll compressor 1 according to the previous embodiment, the welded portion 23b of the housing 23 and the welded portion 24d of the fixed scroll 24 are formed by a semi-molten die casting method, and the weight is 2.3 to 2.4 wt%. However, the carbon amount may be 2.0 wt% or more and 2.7 wt% or less.

(F)
In the high / low pressure dome type scroll compressor 1 according to the previous embodiment, the welded portion 23b of the housing 23 and the welded portion 24d of the fixed scroll 24 are formed by the semi-molten die casting method. May be formed by a semi-solid die casting method.

(G)
In the laser welding according to the previous embodiment, the fiber laser beam LS having a spot diameter of φ0.3 mm is used, but the spot diameter may be from φ0.2 mm to φ0.7 mm.

(H)
Although fiber laser light is used in laser welding according to the previous embodiment, other types of laser light may be used.

(I)
In the high and low pressure dome type scroll compressor 1 according to the previous embodiment, the center line surface roughness (Ra) of the lower surface Ps2 of the welded portion 24d of the fixed scroll 24 and the upper surface Ps1 of the welded portion 23b of the housing 23 before laser welding. Although the standard value was 0.6 to 1.2 μm, the standard value of the center line surface roughness (Ra) may be 1.2 μm or less.

(J)
In the high-low pressure dome type scroll compressor 1 according to the previous embodiment, the standard value of flatness of the lower surface Ps2 of the welded portion 24d of the fixed scroll 24 and the upper surface Ps1 of the welded portion 23b of the housing 23 before laser welding is 0.01. The standard value of flatness should just be 0.03 mm or less.

(K)
In the high and low pressure dome type scroll compressor 1 according to the previous embodiment, chamfering of 0.07 mm is performed on the outer peripheral end of the lower surface of the welded portion 24d of the fixed scroll 24 and the outer peripheral end of the upper surface Ps1 of the welded portion 23b of the housing 23. However, the size of the chamfer may be larger than 0 mm and not more than 1/4 of the spot diameter of the laser beam.

(L)
In laser welding according to the previous embodiment, the output and welding speed of the fiber laser light LS were adjusted so that the heat input per unit length in the welding direction was 50 ± 5 (J / mm). The amount of heat may be 10 (J / mm) or more and 70 (J / mm) or less.

(M)
In the previous embodiment, the welded portions 23b and 24d have an annular shape, but the welded portion may have a block shape. In such a case, hot water is poured in a state where the welds are arranged at predetermined positions in the sand mold, and the housing base and the fixed scroll base are formed. Then, after these substrates are roughly processed and finished to form the housing and the fixed scroll, the welded portion of the housing and the welded portion of the fixed scroll are brought into contact with each other, and only the welded portion is laser-welded.

(N)
In the previous embodiment, the welded portions 23b and 24d were formed from cast iron having a carbon content of 2.3 to 2.4 wt% by a semi-molten die casting method, but the welded portions 23b and 24d have a carbon content of 0. It may be formed from less than 3 wt% low carbon steel.

(O)
In the previous embodiment, the main body portion 23a of the housing 23 and the main body portion 24M of the fixed scroll 24 are formed of cast iron of FC250, but one of the housing 23 and the fixed scroll 24 has a carbon content of 2.3 to 2. It may be formed by a semi-molten die casting method from 4 wt% cast iron.

(P)
In the previous embodiment, the main body portion 23a of the housing 23 and the main body portion 24M of the fixed scroll 24 are formed of cast iron of FC250. However, the main body portion 23a of the housing 23 and the main body portion 24M of the fixed scroll 24 are other than FC250. It may be formed from cast iron having a relatively high carbon content.

-Second Embodiment-
The high and low pressure dome type scroll compressor according to the second embodiment is generally the same as the high and low pressure dome type scroll compressor according to the first embodiment except for the molding method of the housing and the fixed scroll, and the fastening method of the housing and the fixed scroll. Are the same. Therefore, in this embodiment, only the molding method of the housing and the fixed scroll and the fastening method of the housing and the fixed scroll will be described.

<Method for Manufacturing Fixed Scroll and Housing>
The housing 23 is completed through roughing and finishing after a base is molded from cast iron of FC250 by sand casting. In this finishing process, the fastening portion 123b is formed with a truncated conical through hole PB1 whose diameter decreases from the lower end toward the upper end (see FIG. 4).

  On the other hand, the fixed scroll 24 is completed through roughing and finishing after the base body is formed by pouring cast iron of FC250 into the sand mold with the welded portion 24d placed in a predetermined position in the sand mold. To do. In this way, the fixed scroll 24 in which the welded portion 24d is integrated with the main body portion 24M can be obtained. In the finishing process, a truncated conical through-hole PB2 whose diameter decreases from the lower end toward the upper end is formed in the welded portion 24d (see FIG. 4). Note that the angle formed by the axis of the through hole PB2 and the bus is the same as the angle formed by the axis of the through hole PB1 of the housing 23 and the bus. The radius of the opening at the lower end of the through hole PB2 is the same as the radius of the opening at the upper end of the through hole PB1 of the housing 23. That is, the lower surface Ps2 of the welded portion 24d of the fixed scroll 24 and the upper surface Ps1 of the fastening portion 123b of the housing 23 so that the lower end opening of the through hole PB2 of the fixed scroll 24 and the upper end opening of the through hole PB1 of the housing 23 coincide. When contacted, the through hole PB2 of the fixed scroll 24 and the through hole PB1 of the housing 23 form a truncated conical through hole PB3 as shown in FIG.

<Method of joining housing and fixed scroll>
In the present embodiment, the housing 23 and the fixed scroll 24 are fastened not by bolting but by laser welding of the welded portion 24d of the fixed scroll 24 and the taper pin 71 as shown in FIGS. Specifically, after the crankshaft 17, the movable scroll 26, the Oldham ring 39, and the like are incorporated in the housing 23, the lower end opening of the through hole PB2 of the fixed scroll 24 and the upper end opening of the through hole PB1 of the housing 23 coincide. In the state where the upper surface Ps1 of the fastening portion 123b of the housing 23 and the lower surface Ps2 of the welded portion 24d of the fixed scroll 24 are brought into contact with each other, the housing 23 and the fixed scroll 24 are pressed from both sides, and the taper pin 71 is inserted into the through hole PB3. Then, the laser beam LS is irradiated to laser-weld the small diameter portion SD of the taper pin 71 to the welded portion 24d of the fixed scroll 24. The taper pin 71 is made of a low carbon steel having a carbon content of less than 0.3 wt%. Further, in FIG. 5, the welded portion is indicated by reference sign W2.

<Characteristics of High / Low Pressure Dome Scroll Compressor according to Second Embodiment>
(1)
In the manufacture of the high and low pressure dome type scroll compressor according to the second embodiment, the small diameter portion SD of the taper pin 71 and the welded portion 24d of the fixed scroll 24 are in a state where the housing 23 is supported by the large diameter portion LD of the taper pin 71. Fastened by laser welding. For this reason, in this high and low pressure dome type scroll compressor, the hooking portion of the taper pin 71 is required for the welding portion 24d of the fixed scroll 24 and the fastening portion 123b of the housing. And less. Therefore, in the high and low pressure dome type scroll compressor, the thickness of the fastening portion of the housing 23 or the fixed scroll 24 can be reduced by taking advantage of the low distortion joining. As a result, in the high and low pressure dome type scroll compressor, the amount of material used for the housing 23 and the fixed scroll 24 is reduced and the diameter is reduced.

(2)
In the manufacture of the high and low pressure dome type scroll compressor according to the second embodiment, the main body portion 24M of the housing 23 and the fixed scroll 24 is formed of cast iron of FC250. For this reason, in this high and low pressure dome type scroll compressor, material cost is suppressed and seizure resistance is sufficiently secured.

(3)
In the high and low pressure dome type scroll compressor according to the second embodiment, the welded portion 24d of the fixed scroll 24 is formed from cast iron having a carbon content of 2.3 to 2.4 wt% by a semi-molten die casting method, and a taper pin. 71 is formed from a low carbon steel having a carbon content of less than 0.3 wt%. Such a component does not cause minute cracks even when irradiated with laser light. For this reason, in this high and low pressure dome type scroll compressor, the housing 23 and the fixed scroll 24 are well welded.

(4)
In the manufacture of the high and low pressure dome type scroll compressor according to the second embodiment, the taper pin 71 is used. For this reason, in this manufacturing, the fastening position of the housing 23 and the fixed scroll 24 can be stabilized.

<Modification of Second Embodiment>
(A)
In the previous embodiment, the taper pin 71 is used for joining the housing 23 and the fixed scroll 24, but a rivet 72 may be used as shown in FIGS. In such a case, a cylindrical through hole PB11 is formed in the fastening portion 123b of the housing 23. A cylindrical through hole PB12 having the same diameter as the through hole PB11 of the housing 23 is formed in the welded portion 24d of the fixed scroll 24. That is, when the lower surface Ps2 of the welded portion 24d of the fixed scroll 24 and the upper surface Ps1 of the fastening portion 123b of the housing 23 are brought into contact with each other so that the through hole PB12 of the fixed scroll 24 and the through hole PB11 of the housing 23 coincide with each other, The through hole PB12 of the fixed scroll 24 and the through hole PB11 of the housing 23 form a cylindrical through hole PB13 as shown in FIG. In this case, the rivet 72 is inserted into the through hole PB13 so that the head 72a is positioned on the housing 23 side.

  As shown in FIGS. 7 and 8, a recess RS that accommodates the head portion 72 a of the rivet 72 may be formed at the lower end portion of the fastening portion 123 b of the housing 23.

  In this modification, the rivet 72 is formed from a low carbon steel having a carbon content of less than 0.3 wt%, or is formed by the same method as the welded portions 23b and 24d of the first embodiment. Further, the rivet 72 only needs to be formed from a material that can be laser-welded at the tip of the foot 72b.

  Moreover, in FIG.7 and FIG.9, the welding part is shown by the code | symbol W3.

(B)
In the previous embodiment, the welded portion 24d was formed from cast iron having a carbon content of 2.3 to 2.4 wt% by a semi-molten die casting method, but the welded portion 24d has a carbon content of less than 0.3 wt%. May be formed from a low carbon steel.

(C)
In the previous embodiment, the main body portion 24M of the fixed scroll 24 is formed of cast iron of FC250, but the entire fixed scroll 24 is made of cast iron having a carbon content of 2.3 to 2.4 wt% by a semi-molten die casting method. It may be molded.

(D)
In the previous embodiment, the taper pin 71 was formed from low carbon steel having a carbon content of less than 0.3 wt%. However, the taper pin 71 may be formed by the same method as the welded portions 23b and 24d of the first embodiment. Good.

(E)
In the previous embodiment, the taper pin 71 was formed from a low carbon steel having a carbon content of less than 0.3 wt%. However, the taper pin 71 may be formed as long as the small diameter portion SD is formed from a material that can be laser welded.

(F)
In the previous embodiment, the main body portion 24M of the fixed scroll 24 is formed of cast iron of FC250. However, the main body portion 24M of the fixed scroll 24 may be formed of cast iron having a relatively high carbon content other than FC250. .

-Third embodiment-
The high and low pressure dome type scroll compressor according to the third embodiment is generally the same as the high and low pressure dome type scroll compressor according to the first embodiment except for the method of forming the housing and the fixed scroll and the method of fastening the housing and the fixed scroll. Are the same. Therefore, only the molding method of the housing and the fixed scroll and the fastening method of the housing and the fixed scroll will be described below.

<Method for Manufacturing Fixed Scroll and Housing>
The housing 23 and the fixed scroll 24 are molded from cast iron of FC250 by a sand casting method. In the present embodiment, the welded portion is not charged into the sand mold. Further, in the present embodiment, the fixed scroll has a main body portion 24M that is smaller in diameter than the first and second embodiments, and protrudes outward from the outer periphery on the opening side of the outer peripheral wall 24c. A flange portion 24e is formed. As shown in FIG. 10, the housing 23 mainly includes a main body portion 23a and an outer peripheral wall 23e extending upward from the upper end surface of the outer periphery of the main body portion 23a. The outer peripheral wall 23e is formed with a plurality of depressions 23e that open to the inner peripheral surface. The recess 23e is a boundary line between the outer peripheral wall 24c of the fixed scroll 24 and the flange 24e in a state where the upper surface Ps11 of the main body 23a of the housing 23 and the lower surface Ps12 of the flange 24e of the fixed scroll 24 are abutted. It is formed to oppose the neighboring portion 24f.

<Method of joining housing and fixed scroll>
In the present embodiment, the housing 23 and the fixed scroll 24 are fastened not by bolting but by the wedge action of the filler material W4 as shown in FIG. Specifically, after incorporating the crankshaft 17, the movable scroll 26, the Oldham ring 39, etc. into the housing 23, the upper surface Ps11 of the main body portion 23a of the housing 23 and the lower surface Ps12 of the flange portion 24e of the fixed scroll 24 are brought into contact with each other. In a state where the housing 23 and the fixed scroll 24 are pressed from both sides, the welding rod 75 is heated by the laser beam LS in the recess 23e of the housing 23 and the gap OS between the outer peripheral wall 223b of the housing and the flange portion 24e of the fixed scroll 24. The melt solution obtained by pouring is poured in, and it waits for a melt solution to solidify.

<Characteristics of High / Low Pressure Dome Scroll Compressor According to Third Embodiment>
(1)
In the manufacture of the high and low pressure dome type scroll compressor according to the third embodiment, the melt is infiltrated into the recess 23e and is brought into contact with the flange portion 24e of the fixed scroll 24, and then the melt is solidified to fix the fixed scroll. 24 is fixed to the housing 23. For this reason, in this high and low pressure dome type scroll compressor, it is possible to eliminate the bolting allowance of the housing 23 and the fixed scroll 24 and to make use of the advantage of low distortion joining, the thickness of the fastening portion of the housing 23 and the fixed scroll 24. The thickness can be reduced. Therefore, in this high and low pressure dome type scroll compressor, the amount of material used for the housing 23 and the fixed scroll 24 is reduced and the diameter is reduced.

(2)
In the high-low pressure dome type scroll compressor according to the third embodiment, the housing 23 and the fixed scroll 24 are both made of FC250 cast iron. For this reason, in this high and low pressure dome type scroll compressor, material cost is suppressed and seizure resistance is sufficiently secured.

(3)
In the high and low pressure dome type scroll compressor according to the second embodiment, the housing 23 and the fixed scroll 24 are not directly laser-welded. For this reason, in this high and low pressure dome type scroll compressor, the housing 23 and the fixed scroll 24 can be fastened without causing a quality problem.

<Modification of Third Embodiment>
In the previous embodiment, both the housing 23 and the fixed scroll 24 are formed from cast iron of FC250. However, both the housing 23 and the fixed scroll 24 may be formed from cast iron having a relatively high carbon content other than FC250. . Moreover, either one of the housing 23 and the fixed scroll 24 may be formed from cast iron of FC250, and the other may be formed from other cast iron.

-Fourth embodiment-
As shown in FIG. 13, the oscillating rotary compressor 801 according to the fourth embodiment is a 2-cylinder oscillating rotary compressor, mainly a cylindrical hermetic dome-shaped casing 810, The rotary rotary compression mechanism 815, the drive motor 816, the suction pipe 819, the discharge pipe 820, and the muffler 860 are included. Note that an accumulator (gas-liquid separator) 895 is attached to a casing 810 in the oscillating rotary compressor 801. Hereinafter, the components of the oscillating rotary compressor 801 will be described in detail.

<Details of swinging rotary compressor components>
(1) Casing The casing 810 includes a substantially cylindrical trunk casing portion 811, a bowl-shaped upper wall portion 812 that covers the upper end of the trunk casing portion 811, and a bowl-shaped bottom that covers the lower end of the trunk casing portion 811. And a wall portion 813. The casing 810 mainly accommodates a swinging rotary compression mechanism 815 that compresses a gas refrigerant and a drive motor 816 disposed above the swinging rotary compression mechanism 815. The oscillating rotary compression mechanism 815 and the drive motor 816 are connected by a crankshaft 817 arranged so as to extend in the vertical direction in the casing 810.

(2) Oscillating rotary compression mechanism As shown in FIGS. 13 and 15, the oscillating rotary compression mechanism 815 mainly includes a crankshaft 817, a piston 821, a bush 822, a front head 823, The first cylinder block 824, the middle plate 825, the second cylinder block 826, and the rear head 827 are configured. In the present embodiment, the front head 823, the first cylinder block 824, the middle plate 825, the second cylinder block 826, and the rear head 827 are integrally fastened by laser welding. In the present embodiment, the oscillating rotary compression mechanism 815 is immersed in the lubricating oil L stored at the bottom of the casing 810, and the oscillating rotary compression mechanism 815 has no difference in the lubricating oil L. It is designed to be pressurized. Hereinafter, the components of the oscillating rotary compression mechanism 815 will be described in detail.

a) First Cylinder Block As shown in FIG. 14, the first cylinder block 824 is formed with a cylinder hole 824a, a suction hole 824b, a discharge passage 824c, a bush accommodation hole 824d, and a blade accommodation hole 824e. As shown in FIGS. 13 and 14, the cylinder hole 824a is a cylindrical hole that penetrates along the thickness direction. The suction hole 824b penetrates from the outer peripheral wall surface to the cylinder hole 824a. The discharge path 824c is formed by cutting out a part of the inner peripheral side of the cylindrical portion that forms the cylinder hole 824a. The bush accommodating hole 824d is a hole penetrating along the thickness direction, and is disposed between the suction hole 824b and the discharge path 824c when viewed along the thickness direction. The blade accommodation hole 824e is a hole that penetrates along the plate thickness direction and communicates with the bush accommodation hole 824d.

  In the first cylinder block 824, the eccentric shaft portion 817a of the crankshaft 817 and the roller portion 821a of the piston 821 are accommodated in the cylinder hole 824a, and the blade portion 821b and the bush 822 of the piston 821 are accommodated in the bush accommodation hole 824d. When the blade portion 821b of the piston 821 is accommodated in the blade accommodation hole 824e, the discharge path 824c is fitted to the front head 823 and the middle plate 825 so as to face the front head 823 (see FIG. 15). As a result, a first cylinder chamber Rc1 is formed in the oscillating rotary compression mechanism 815. The first cylinder chamber Rc1 includes a suction chamber that communicates with the suction hole 824b by the piston 821, and a discharge chamber that communicates with the discharge passage 824c. It will be divided into.

  The first cylinder block 824 is provided with a welded portion 824w on a part of the outer periphery. This welded part 824w is formed by cast iron with a carbon content of 2.3 to 2.4 wt% by a semi-molten die casting method, or the carbon content of 0 as in the welded parts 23b and 24d according to the first embodiment. It is formed from a low carbon steel of less than 3 wt%, and is incorporated into the first cylinder block 824 by the same method as the method according to the first embodiment. That is, in the present embodiment, the portions other than the welded portion 824w of the first cylinder block 824 are formed from FC250 cast iron. Then, as shown in FIG. 1, this welded portion 824w is laser welded to the welded portion 823w of the front head 823 and the welded portion 825w of the middle plate 825 by the same method as that shown in the first embodiment. The

b) Second cylinder block As in the first cylinder block 824, the second cylinder block 826 includes a cylinder hole 826a, a suction hole 826b, a discharge passage 826c, a bush accommodation hole 826d, and a blade accommodation hole, as shown in FIG. 826e is formed. As shown in FIGS. 13 and 14, the cylinder hole 826a is a cylindrical hole penetrating along the plate thickness direction. The suction hole 826b penetrates from the outer peripheral wall surface to the cylinder hole 826a. The discharge path 826c is formed by cutting out a part of the inner peripheral side of the cylindrical portion that forms the cylinder hole 826a. The bush accommodating hole 826d is a hole penetrating along the plate thickness direction, and is disposed between the suction hole 826b and the discharge passage 826c when viewed along the plate thickness direction. The blade accommodation hole 826e is a hole that penetrates along the plate thickness direction and communicates with the bush accommodation hole 826d.

  In the second cylinder block 826, the eccentric shaft portion 817b of the crankshaft 817 and the roller portion 821a of the piston 821 are accommodated in the cylinder hole 826a, and the blade portion 821b and the bush 822 of the piston 821 are accommodated in the bush accommodation hole 826d. When the blade portion 821b of the piston 821 is accommodated in the blade accommodation hole 826e, the discharge path 826c is fitted to the rear head 827 and the middle plate 825 so as to face the rear head 827 side (see FIG. 15). As a result, a second cylinder chamber Rc2 is formed in the oscillating rotary compression mechanism 815. The second cylinder chamber Rc2 includes a suction chamber that communicates with the suction hole 826b by the piston 821, and a discharge chamber that communicates with the discharge path 826c. It will be divided into.

  Further, the second cylinder block 826 is provided with a welded portion 826w on a part of the outer periphery. This welded portion 826w is formed from a cast iron having a carbon content of 2.3 to 2.4 wt% by a semi-molten die casting method, as in the welded portions 23b and 24d according to the first embodiment, or has a carbon content of 0. It is formed from a low carbon steel of less than 3 wt%, and is incorporated into the second cylinder block 826 by the same method as the method according to the first embodiment. That is, in this embodiment, the portion other than the welded portion 826w of the second cylinder block 826 is formed from FC250 cast iron. Then, as shown in FIG. 1, the welded portion 826w is laser welded to the welded portion 825w of the middle plate 825 and the welded portion 827w of the rear head 827 by the same method as that shown in the first embodiment. .

c) Crankshaft The crankshaft 817 is provided with two eccentric shaft portions 817a and 817b at one end. The two eccentric shaft portions 817a and 817b are formed such that their eccentric shafts face each other across the central axis of the crankshaft 817. The crankshaft 817 is fixed to the rotor 852 of the drive motor 816 on the side where the eccentric shaft portions 817a and 817b are not provided.

d) Piston The piston 821 has a substantially cylindrical roller portion 821a and a blade portion 821b protruding outward in the radial direction of the roller portion 821a. The roller portion 821a is inserted into the cylinder holes 824a and 826a of the cylinder blocks 824 and 826 while being fitted to the eccentric shaft portions 817a and 817b of the crankshaft 817. Accordingly, when the crankshaft 817 rotates, the roller portion 821a performs a revolving motion around the rotation shaft of the crankshaft 817. The blade portion 821b is accommodated in the bush accommodation holes 824d and 826d and the blade accommodation holes 824e and 826e. As a result, the blade portion 821b swings and moves back and forth along the longitudinal direction.

e) Bush The bush 822 is a substantially semi-cylindrical member, and is accommodated in the bush accommodation holes 824d and 826d so as to sandwich the blade portion 821b of the piston 821.

f) Front Head The front head 823 is a member that covers the discharge path 824c side of the first cylinder block 824, and is fitted in the casing 810. A bearing portion 823a is formed on the front head 823, and a crankshaft 817 is inserted into the bearing portion 823a. Further, the front head 823 has an opening 823 b for guiding the refrigerant gas flowing through the discharge passage 824 c formed in the first cylinder block 824 to the discharge pipe 820. And this opening 823b is obstruct | occluded or open | released by the discharge valve (not shown) for preventing the back flow of refrigerant gas.

  The front head 823 is provided with a welded portion 823w at a position facing the welded portion 824w of the first cylinder block 824. This welded portion 823w is formed by cast iron with a carbon content of 2.3 to 2.4 wt% by a semi-molten die casting method, similarly to the welded portions 23b and 24d according to the first embodiment, or a carbon content of 0 It is formed from a low carbon steel of less than 3 wt% and is incorporated into the front head 823 by a method similar to the method according to the first embodiment. That is, in the present embodiment, the portion other than the welded portion 823w of the front head 823 is formed from FC250 cast iron. And this welding part 823w is laser-welded to the welding part 824w of the 1st cylinder block 824 by the method similar to the method shown by 1st Embodiment, as FIG. 1 shows.

g) Rear Head The rear head 827 covers the discharge path 826c side of the second cylinder block 826. The rear head 827 is formed with a bearing portion 827a, and a crankshaft 817 is inserted into the bearing portion 827a. The rear head 827 has an opening (not shown) for guiding the refrigerant gas flowing through the discharge passage 826 c formed in the second cylinder block 826 to the discharge pipe 820. And this opening is obstruct | occluded or open | released by the discharge valve (not shown) for preventing the reverse flow of refrigerant gas.

  The rear head 827 is provided with a welded portion 827w on a part of the outer periphery. The welded portion 827w is formed by a semi-molten die casting method from cast iron having a carbon content of 2.3 to 2.4 wt%, as in the welded portions 23b and 24d according to the first embodiment, or a carbon content of 0 It is formed from a low carbon steel of less than 3 wt% and is incorporated into the rear head 827 by the same method as the method according to the first embodiment. That is, in the present embodiment, the portion other than the welded portion 827w of the rear head 827 is formed from FC250 cast iron. And this welding part 827w is laser-welded to the welding part 826w of the 2nd cylinder block 826 by the method similar to the method shown by 1st Embodiment, as FIG. 1 shows.

h) Middle Plate The middle plate 825 is disposed between the first cylinder block 824 and the second cylinder block 826, and partitions the first cylinder chamber Rc1 and the second cylinder chamber Rc2.

  Further, the middle plate 825 is provided with a welded portion 825 w at a part of the outer periphery. This welded portion 825w is formed from cast iron having a carbon content of 2.3 to 2.4 wt% by a semi-molten die casting method, as in the welded portions 23b and 24d according to the first embodiment, or has a carbon content of 0. It is formed from a low carbon steel of less than 3 wt%, and is incorporated into the middle plate 825 by the same method as the method according to the first embodiment. In other words, in the present embodiment, the portion other than the welded portion 825w of the middle plate 825 is formed from FC250 cast iron. Then, as shown in FIG. 1, the welded portion 825 w is welded to the welded portion 824 w of the first cylinder block 824 and the welded portion 826 w of the second cylinder block 826 by a method similar to the method shown in the first embodiment. Laser welded.

(3) Drive Motor The drive motor 816 is a DC motor in the present embodiment, and mainly includes an annular stator 851 fixed to the inner wall surface of the casing 810 and a slight gap (air gap) inside the stator 851. And a rotor 852 accommodated rotatably with a passage).

  In the stator 851, a copper wire is wound around a tooth portion (not shown), and coil ends 853 are formed above and below. In addition, a core cut portion (not shown) is formed on the outer peripheral surface of the stator 851 from the upper end surface to the lower end surface of the stator 851 and notched at a plurality of locations at predetermined intervals in the circumferential direction. .

  A crankshaft 817 is fixed to the rotor 852 along the rotation axis.

(4) Suction pipe The suction pipe 819 is provided so as to penetrate the casing 810, and one end thereof is fitted into suction holes 824b and 826b formed in the first cylinder block 824 and the second cylinder block 826, The other end is fitted in the accumulator 895.

(5) Discharge Pipe The discharge pipe 820 is provided so as to penetrate the upper wall portion 812 of the casing 810.

(6) Muffler The muffler 860 is for muting the discharge sound of the refrigerant gas, and is attached to the front head 823.

<Operation of oscillating rotary compressor>
When the drive motor 816 is driven, the eccentric shaft portions 817a and 817b rotate eccentrically around the crankshaft 817, and the roller portion 821a fitted to the eccentric shaft portions 817a and 817b has the outer circumferential surface of the cylinder chamber Rc1, Revolves in contact with the inner peripheral surface of Rc2. As the roller portion 821a revolves in the cylinder chambers Rc1 and Rc2, the blade portion 821b moves forward and backward while being held by the bushes 822 on both sides. Then, the low-pressure refrigerant gas is sucked into the suction chamber from the suction pipe 819 and compressed in the discharge chamber to be high pressure, and then the high-pressure refrigerant gas is discharged from the discharge passages 824c and 826c.

<Features of oscillating rotary compressor>
(1)
In the manufacture of the oscillating rotary compressor 801 according to the fourth embodiment, laser welding is used instead of bolt fastening for fastening the front head 823, the cylinder blocks 824, 826, the middle plate 825, and the rear head 827. For this reason, in this oscillating rotary compressor 801, the bolting allowance is eliminated from the front head 823, the cylinder blocks 824, 826, the middle plate 825, and the rear head 827, and the front head 823, the cylinder blocks 824, 826, the middle plate 825 are eliminated. And the thickness of the fastening part of the rear head 827 is made thin. Therefore, in the oscillating rotary compressor 801, the amount of materials used for the front head 823, the cylinder blocks 824, 826, the middle plate 825, and the rear head 827 is reduced.

(2)
In the manufacture of the oscillating rotary compressor 801 according to the fourth embodiment, the front head 823, the cylinder blocks 824, 826, the middle plate 825, and the rear head 827 are formed of cast iron of FC250 except for the welded portion. For this reason, in this oscillating rotary compressor 801, the material cost is suppressed and seizure resistance is sufficiently secured.

(3)
In the oscillating rotary compressor 801 according to the fourth embodiment, the front head 823, the cylinder blocks 824, 826, the middle plate 825, and the welded portions 823w, 824w, 825w, 826w, 827w of the rear head 827 all have a carbon content of 2. It is molded from a cast iron of 3 to 2.4 wt% by a semi-molten die casting method or from a low carbon steel having a carbon content of less than 0.3 wt%. Parts manufactured in this manner do not cause minute cracks even when irradiated with laser light. For this reason, in this oscillating rotary compressor 801, the front head 823, the cylinder blocks 824, 826, the middle plate 825, and the rear head 827 are well welded.

<Modification of Fourth Embodiment>
(A)
In the previous embodiment, the front head 823, the cylinder blocks 824, 826, the middle plate 825, and the rear head 827 of the oscillating rotary compressor 801 are welded parts 823w, 824w, 825w, 826w formed from a material that can be laser welded. 827w is incorporated, and the welded portions 823w, 824w, 825w, 826w, and 827w are laser-welded to form a swinging rotary compression mechanism 815. Here, such a welding portion incorporation technique or laser welding technique may be applied to the cylinder block 924 of the rotary compressor 901 as shown in FIG. 16 and 17, reference numeral 924a indicates a cylinder hole, reference numeral 924c indicates a discharge passage, reference numeral 924b indicates a suction hole, reference numeral 924d indicates a vane housing groove, reference numeral 924w indicates a welded portion, Reference numeral 917 indicates a crankshaft, reference numeral 917a indicates an eccentric shaft portion of the crankshaft, reference numeral 922 indicates a vane, reference numeral 921 indicates a roller, reference numeral 923 indicates a spring, and reference numeral Rc3 indicates a cylinder chamber. .

(B)
In the present invention, the oscillating rotary compressor according to the fourth embodiment and the rotary compressor according to the modified example (A), the contents shown in the second embodiment and the third embodiment, the first embodiment, The contents of modifications of the second embodiment and the third embodiment can be applied as appropriate.

  The compressor manufacturing method according to the present invention is capable of fastening internal parts without causing quality problems, and reducing the amount of material used without significantly increasing raw material costs, thereby realizing cost reduction. This contributes to lowering the price and making the compressor more compact.

It is a longitudinal cross-sectional view of the high-low pressure dome type scroll compressor which concerns on 1st Embodiment of this invention. It is an enlarged view of a housing and a fixed scroll before laser welding in the high and low pressure dome type scroll compressor concerning a 1st embodiment of the present invention. It is an enlarged view of the housing and fixed scroll after laser welding in the high-low pressure dome type scroll compressor concerning a 1st embodiment of the present invention. It is an enlarged view of a housing and a fixed scroll before laser welding in a high and low pressure dome type scroll compressor according to a second embodiment of the present invention. It is an enlarged view of a housing and a fixed scroll after laser welding in a high and low pressure dome type scroll compressor according to a second embodiment of the present invention. It is an enlarged view of a housing and a fixed scroll after laser welding in a high and low pressure dome type scroll compressor according to an example of a modification (A) of the second embodiment of the present invention. It is an enlarged view of a housing and a fixed scroll after laser welding in a high and low pressure dome type scroll compressor according to an example of a modification (A) of the second embodiment of the present invention. It is an enlarged view of a housing and a fixed scroll after laser welding in a high and low pressure dome type scroll compressor according to another example of the modification (A) of the second embodiment of the present invention. It is an enlarged view of a housing and a fixed scroll after laser welding in a high and low pressure dome type scroll compressor according to another example of the modification (A) of the second embodiment of the present invention. It is an enlarged view of a housing and a fixed scroll before a fixing operation in a high and low pressure dome type scroll compressor according to a third embodiment of the present invention. It is an enlarged view of a housing and a fixed scroll during a fixing operation in a high and low pressure dome type scroll compressor according to a third embodiment of the present invention. It is an enlarged view of a housing and a fixed scroll after a fixing operation in a high and low pressure dome type scroll compressor according to a third embodiment of the present invention. It is a longitudinal cross-sectional view of the rocking | swiveling rotary compressor which concerns on 4th Embodiment of this invention. It is a top view of the cylinder block of the rocking | fluctuation type rotary compressor which concerns on 4th Embodiment of this invention. It is a cross-sectional view of a cylinder chamber of an oscillating rotary compressor according to a fourth embodiment of the present invention. It is a top view of the cylinder block of the rotary compressor which concerns on the modification (A) of 4th Embodiment of this invention. It is a cross-sectional view of the cylinder chamber of the rotary compressor which concerns on the modification (A) of 4th Embodiment of this invention.

Explanation of symbols

23 Housing (first internal part)
23a Main body (first main body)
23b Welded part (first welded part)
23e depression (recess)
24 Fixed scroll (second internal part)
24d welded part (second welded part)
24e collar part 24f boundary line vicinity part of main body part and collar part of fixed scroll 24M main body part (second main body part)
71 Tapered pin (insertion pin)
72 rivets (plug pins)
72a Head of rivet (large diameter part)
72b Foot of rivet (small diameter part)
75 Welding rod (filler material)
223b The outer peripheral wall (wall part) of the housing
823 Front head 823w Front head weld 824 First cylinder block 824w First cylinder block weld 825 Middle plate 825w Middle plate weld 826 Second cylinder block 826w Second cylinder block weld 827 Rear head 827w Rear head weld Portion 924 Cylinder block 924w Cylinder block weld PB1 Housing through hole (second through hole)
PB2 Fixed scroll through hole (first through hole)
PB11 Housing through hole (second through hole)
PB12 Fixed scroll through hole (first through hole)
SD Small diameter part of taper pin

Claims (7)

A first body portion (23a) comprising “a cast iron difficult to weld by laser having a carbon content of 3.0 wt% to 4.0 wt%”; and “low carbon having a carbon content of less than 0.3 wt% Steel "or" laser-weldable cast iron having a carbon content of 2.0 wt% to 2.7 wt% "and provided integrally with the first main body at least at a part of the outer periphery of the first main body A first internal component preparation step of preparing a first internal component (23,824) having a first welded portion (23b, 824w),
Second body portion (24M) and "low carbon steel having a carbon content of less than 0.3 wt%" or "laser weldable cast iron having a carbon content of 2.0 wt% to 2.7 wt%" A second internal part (24,825) having a second welded portion (24d, 825w) provided integrally with the second main body portion on at least a part of the outer periphery of the second main body portion. 2 internal parts preparation process,
A butting step of matching the first internal part and the second internal part so that the first weld and the second weld are in contact with each other;
A method of manufacturing a compressor, comprising: a joining step of joining the first internal part and the second internal part by laser welding the first welded part and the second welded part. 2. The method of manufacturing a compressor according to claim 1, wherein the second main body portion is made of “cast iron having a carbon content of 3.0 wt% to 4.0 wt% that is difficult to laser weld”. The first weld has an annular shape,
The second weld has an annular shape,
The said 1st welding part and the said 2nd welding part are laser-welded over the perimeter in the said joining process, The said 1st internal component and the said 2nd internal component are joined. Manufacturing method of the compressor. From the main body (24M) and “low carbon steel having a carbon content of less than 0.3% by weight” or “laser weldable cast iron having a carbon content of 2.0% to 2.7% by weight” A first internal component (24) having a welded portion (24d) provided integrally with the main body portion on at least a part of the outer periphery of the main body portion, and first through holes (PB2, PB12) penetrating the welded portion. A first internal part preparation step for preparing
A second comprising a second internal part (23) comprising a second through hole (PB1, PB11), comprising "a cast iron difficult to laser weld having a carbon content of 3.0 wt% to 4.0 wt%". Internal parts preparation process,
A butting step of abutting the first internal part and the second internal part so that the first through hole and the second through hole communicate with each other;
Laser weldable cast iron having at least a small diameter portion (72b, SD) having a carbon content of less than 0.3% by weight or a carbon content of 2.0% to 2.7% by weight , The first through hole and the insertion pin (71, 72) in such a manner that the small diameter portion is positioned on the first internal component side and the large diameter portion (72a) is positioned on the second internal component side. A pin insertion step of inserting into the second through hole;
A method of manufacturing a compressor comprising: a fixing step of fixing the second internal part to the first internal part by laser welding the welded portion and a small diameter portion of the insertion pin. The insertion pin is a taper pin that tapers from the end of the second through hole toward the end of the first through hole.
The method of manufacturing a compressor according to claim 4, wherein the first through hole and the second through hole have a shape corresponding to a shape of the insertion pin. The method of manufacturing a compressor according to claim 4, wherein the insertion pin is a rivet having a head on the second through hole side. It consists of "a cast iron that is difficult to laser weld with a carbon content of 3.0 wt% to 4.0 wt%", and is provided on one side of the first main body portion (24M) and the first main body portion. A first internal component preparation step of preparing a first internal component (24) having a flange portion (24e) provided so as to protrude outward from the outer periphery of
The second main body portion (23a) and a wall standing on the outer peripheral portion of the second main body portion, consisting of “cast iron difficult to weld by laser having a carbon content of 3.0 wt% to 4.0 wt%” A second internal component preparation step of preparing a second internal component (23) having a portion (223b) and a recess (23e) that opens to the inner peripheral surface of the wall portion;
A butting step in which the first internal component and the second internal component are abutted so that the concave portion opposes a boundary vicinity portion (24f) between the main body portion and the flange portion;
After the melt solution obtained by melting the melt material (75) is infiltrated into the concave portion and brought into contact with the flange portion, the melt solution is solidified so that the first internal part is replaced with the second internal component. A method for manufacturing a compressor comprising a fixing step for fixing to a component.

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