JP2020094559A - Hermetic type compressor and freezer - Google Patents

Abstract

To provide a hermetic type compressor capable of restraining increase of a sliding loss.SOLUTION: A compression element 106 of a hermetic type compressor 100 has:a crank shaft 134 having a main shaft part 155 and an eccentric shaft part 156; a block 123 having a cylindrical cylinder bore 124; and a piston 125 coupled with the eccentric shaft part via a connection rod 158, and provided movably forward and backward in the cylinder bore. A first frame 136 having a first bearing hole 141, and journaling a first portion 152 of the main shaft part inserted in the first bearing hole on an inner periphery, a second frame 138 having a second bearing hole 150, journaling a second portion 154 provided on a side opposite to the eccentric shaft part across the first portion at the main shaft part and inserted in the second bearing hole on an inner periphery, and arranged to sandwich an electric element 104 between it and the second frame, and a first connection part 137 and a second connection part 139 connected to the first frame and the second frame are integrally formed on the block.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hermetic compressor and a refrigeration system.

As a conventional hermetic compressor, the compressor disclosed in Patent Document 1 is known. In this compressor, a main frame that pivotally supports the upper end of the crankshaft and a bearing frame that pivotally supports the lower end of the crankshaft are connected to each other.

CN203962324 publication

In the compressor of Patent Document 1, it is difficult to assemble the bearing holes of the main frame and the bearing holes of the bearing frame so that the precision of the coaxiality between them becomes high. Further, even if the main frame and the bearing frame are assembled so that the bearing holes are coaxial with each other, the coaxiality of the bearing holes may be lowered due to a shock during transportation of the compressor. When the coaxiality of the bearing hole is reduced in this way, sliding loss between the crankshaft and the main frame and the bearing frame is increased.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a hermetic compressor and a refrigeration apparatus capable of suppressing an increase in sliding loss.

A hermetic compressor according to an aspect of the present invention includes a compression element that compresses a refrigerant gas, a rotor and a stator, an electric element that drives the compression element, the compression element, and the electric element. And a crankshaft having a main shaft portion and an eccentric shaft portion eccentrically provided on the main shaft portion, a block having a cylindrical cylinder bore, and the eccentric shaft. And a piston that is reciprocally provided in the cylinder bore, and has a first bearing hole in the block, and is inserted into the first bearing hole. Has a first frame for axially supporting the first portion of the main shaft portion on the inner peripheral surface and a second bearing hole, and is located on the opposite side of the main shaft portion from the side of the eccentric shaft portion with the first portion interposed therebetween. A second frame that is provided and that axially supports the second portion that is inserted into the second bearing hole on the inner peripheral surface and that is arranged so as to sandwich the electric element between the second frame and the first frame; , A first connecting portion and a second connecting portion connected to the first frame and the second frame are integrally formed.

A refrigeration apparatus according to another aspect of the present invention includes a refrigeration cycle in which a hermetic compressor, a radiator, a decompression device, and a heat absorber are annularly connected by a pipe.

INDUSTRIAL APPLICABILITY The present invention has an effect that it is possible to provide a hermetic compressor and a refrigerating apparatus that have the above-mentioned configuration and can suppress an increase in sliding loss.

The above objects, other objects, features, and advantages of the present invention will become apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings.

It is sectional drawing which shows the hermetic type compressor which concerns on Embodiment 1 of this invention. It is the figure which looked at the block and electric element of Drawing 1 from the upper part. It is the figure which looked at the block and electric element of Drawing 1 from the bottom. It is sectional drawing which shows schematically the refrigeration apparatus which concerns on Embodiment 2 of this invention.

A hermetic compressor according to a first aspect of the present invention includes a compression element for compressing a refrigerant gas, a rotor and a stator, and an electric element for driving the compression element, and the compression element and the electric element. And a crankshaft having an eccentric shaft portion eccentrically provided on the main shaft portion, and a block having a cylindrical cylinder bore,
A piston that is connected to the eccentric shaft portion via a connecting rod and that is reciprocally provided in the cylinder bore; the block has a first bearing hole; and the first bearing A first frame that axially supports an inner peripheral surface of a first portion of the main shaft portion that is inserted into the hole; and a second bearing hole, and the main shaft portion has the eccentric shaft portion side with the first portion interposed therebetween. A second portion that is provided on the opposite side and that axially supports a second portion that is inserted into the second bearing hole at an inner peripheral surface and that is arranged so as to sandwich the electric element with the first frame. Two frames and a first connecting portion and a second connecting portion connected to the first frame and the second frame are integrally formed.

According to this configuration, the first frame and the second frame are connected by the first connecting portion and the second connecting portion, and these are integrally formed in the block. Therefore, the first bearing hole of the first frame and the second bearing hole of the second frame can be simultaneously processed, and the block can be formed so as to be arranged coaxially. Further, since the first frame and the second frame are connected at two places, the block has high rigidity, so that the processing distortion in the block can be reduced and the accuracy of the coaxiality can be improved. Therefore, it is possible to suppress an increase in sliding loss between the main shaft portion inserted into these bearing holes and the frame (inner peripheral surface of the frame) around each bearing hole.

In the hermetic compressor according to the second invention, the first connecting portion and the second connecting portion may be arranged in the reciprocating direction of the piston so that the main shaft portion is sandwiched between the first connecting portion and the second connecting portion.

According to the present invention, a large force acts on the block in the reciprocating direction by the reciprocating motion of the piston. This force can be received by the first connecting portion and the second connecting portion arranged in the reciprocating direction, and the inclination of the cylinder bore, the first bearing hole, and the second bearing hole in the block can be prevented. Therefore, it is possible to reduce an increase in sliding friction between the cylinder bore and the piston due to the inclination, and between the frame (inner peripheral surface of the frame) around each bearing hole and the main shaft portion.

A hermetic compressor according to a third invention is the hermetic compressor according to the first or second invention, wherein the stator has an iron core and a winding wound around the iron core, and is orthogonal to the reciprocating direction of the piston. In the direction, a portion of the iron core that is not wound by the winding may be exposed from at least one end of the first frame and the second frame on the stator.

According to the present invention, the area of the winding exposed from the first frame and the second frame is increased, and the iron core is exposed from the first frame and the second frame. For this reason, even if the iron core is heated due to heat generation of the winding due to energization, heat is radiated from the winding and the exposed portion of the iron core. As a result, it is possible to suppress a decrease in the efficiency of the electric element due to a temperature increase.

A hermetic compressor according to a fourth aspect is the hermetic compressor according to any one of the first to third aspects, wherein the rotor is fixed to a third portion of the main shaft portion between the first portion and the second portion. And a diameter of the third portion is smaller than a diameter of the first portion and larger than a diameter of the second portion.

According to the invention, the diameter of the second part is smaller than the diameter of the third part. Accordingly, when the second portion is passed through the fixed portion and then inserted into the second bearing hole, it is difficult for the second portion to contact the fixed portion, and damage to the second portion and the fixed portion can be prevented.

Also, the diameter of the first portion is larger than the diameter of the third portion. As a result, the second portion is inserted into the fixed portion, and then the third portion is press-fitted into the fixed portion. At this time, the first portion on the side opposite to the second portion side contacts the fixing portion without being inserted into the fixing portion. Therefore, it is possible to easily position the third portion of the fixed portion.

In the hermetic compressor according to the fifth invention, in any one of the first to fourth inventions, the electric element may be driven by an inverter circuit at a plurality of frequencies. According to the present invention, even if the frequency for driving the electric element is changed by the inverter circuit, it is possible to suppress an increase in sliding loss between the first frame and the second frame and the main shaft portion.

A refrigeration system according to a sixth aspect of the present invention includes a refrigeration cycle in which the hermetic compressor, the radiator, the decompression device, and the heat absorber according to any one of the first to fifth aspects of the invention are annularly connected by a pipe. According to the present invention, the energy efficiency and productivity of the refrigeration system can be improved by using the hermetic compressor as described above.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. In addition, the eccentric shaft portion side of the crankshaft is described as an upper side and the opposite side is a lower side than the main shaft side, but the arrangement of the hermetic compressor is not limited to this.

(Embodiment 1)
<Structure of hermetic compressor>
As shown in FIGS. 1 to 3, the hermetic compressor 100 according to the first embodiment is a device that pumps a refrigerant gas 112, and is used, for example, in a refrigeration cycle. Examples of the apparatus using the refrigeration cycle include household appliances and business appliances. The household appliances include, for example, a refrigerating device such as an electric refrigerator, an air conditioner, and the like, and the commercial devices include, for example, a commercial showcase and a refrigerating device such as a vending machine.

The hermetic compressor 100 includes a compressor body 108 and a hermetic container 102, and the compressor body 108 includes an electric element 104 and a compression element 106. The closed container 102 is formed by, for example, drawing an iron plate. The airtight container 102 houses the compressor body 108 in an internal space and hermetically seals the internal space. The compressor body 108 is elastically supported by the closed container 102 by an elastic member such as a suspension spring 110.

In addition, a refrigerant gas 112 is enclosed in the closed container 102, and a lubricating oil 114 is stored therein. As the refrigerant gas 112, for example, a heat medium such as hydrocarbon R600a having a low global warming potential is used. The lubricating oil 114 is used to lubricate the compression element 106, for example, and is stored in the lower portion of the closed container 102.

Further, a suction pipe (not shown) and a discharge pipe (not shown) are connected to the closed container 102. One end of the suction pipe and the discharge pipe communicate with the internal space of the closed container 102, and the other end is connected to a pipe (not shown) of the refrigeration cycle. As a result, the refrigerant gas 112 flows into the closed container 102 through the suction pipe, is compressed by the compression element 106 in the closed container 102, and is discharged through the discharge pipe.

The electric element 104 has a stator 119 and a rotor 120, which drive the compression element 106. The rotor 120 has, for example, a yoke 121 and a magnet 122, and the yoke 121 has a base surface portion 121a, a side surface portion 121b, and a fixed portion 121c.

The fixing portion 121c has a cylindrical shape and has a first through hole 121d. The base portion 121a has an annular shape and extends from the lower portion of the fixed portion 121c to the outside in the radial direction. The fixed portion 121c may extend below the base surface portion 121a.

The side surface portion 121b has a cylindrical shape, is provided coaxially with the fixing portion 121c so as to surround the periphery of the fixing portion 121c, and extends upward from the outer peripheral edge of the base surface portion 121a. The stator 119 is arranged above the base surface portion 121a and inside the side surface portion 121b. Therefore, the periphery of the stator 119 is surrounded by the rotor 120.

The magnet 122 is attached to the inner peripheral surface of the side surface portion 121b between the side surface portion 121b and the stator 119. As a result, the rotor 120 rotates around the stator 119. Therefore, the electric element 104 is an outer rotor type motor.

The stator 119 has a substantially cylindrical shape, is arranged coaxially with the rotor 120 inside the rotor 120, and has an iron core (fixed iron core 116) and a winding 118. The fixed iron core 116 is formed by laminating a plurality of laminated steel plates, for example, and the laminated steel plate is formed of an electromagnetic steel plate such as a silicon steel plate.

The fixed iron core 116 has, for example, a substantially cylindrical shape, and has a second through hole 116a extending in the vertical direction. The fixed iron core 116 has an inner peripheral surface surrounding the second through hole 116a and an outer peripheral surface on the opposite side in the radial direction. A plurality of grooves (slots) are provided on the outer peripheral surface.

The slot is recessed from the outer peripheral surface toward the inner peripheral surface and extends in the vertical direction. Therefore, the fixed iron core 116 is provided with a cylindrical central cylindrical portion 116b between the inner peripheral surface and the slot in the radial direction. In addition, the plurality of slots are arranged at intervals in the circumferential direction, and partition walls 117 are provided between the adjacent slots. The partition wall portion 117 extends radially outward from a portion corresponding to the outer peripheral surface of the central cylindrical portion 116b.

The winding 118 is, for example, an insulated wire in which the surface of a conductor such as copper is covered with an insulating layer such as enamel. The winding 118 is connected to the inverter circuit 101 connected to the power supply. The drive frequency of the electric element 104 is controlled by the inverter circuit 101, and the electric element 104 is driven at a plurality of frequencies.

The winding 118 is inserted into the slot of the fixed iron core 116 and wound around the partition wall 117. As a result, the plurality of winding portions 118a around which the winding 118 is wound are arranged in a cylindrical shape so as to surround the center cylindrical portion 116b. The inner diameter R1 of the cylindrical shape formed by the plurality of winding portions 118a is equal to or larger than the outer diameter of the central cylindrical portion 116b, and the central cylindrical portion 116b is not covered by the winding portion 118a.

Part or all of the partition 117 is covered with the winding part 118a. When a part of the partition wall 117 is covered with the winding part 118a, the space between the winding part 118a and the central cylindrical part 116b in the partition wall 117 appears to the outside.

Further, the central cylindrical portion 116b is provided with a plurality of first insertion holes 116c. The first insertion hole 116c is arranged around the second through hole 116a, extends in the vertical direction, and penetrates the fixed iron core 116.

The compression element 106 comprises a crankshaft 134, a piston 125, a connecting rod 158 and a block 123. The direction in which the piston 125 reciprocates is referred to as the reciprocating direction, the direction of the central axis of the crankshaft 134 is referred to as the axial direction, and the reciprocating direction and the direction orthogonal to the axial direction are referred to as orthogonal directions. Further, a case where the axial direction of the crankshaft 134 extends in the vertical direction will be described, but the arrangement direction of the hermetic compressor 100 is not limited to this.

The crankshaft 134 is formed of a highly rigid casting or the like, and has a main shaft portion 155, an eccentric shaft portion 156, and a flange portion 157. The main shaft portion 155 and the eccentric shaft portion 156 are columnar shapes whose central axes extend in the axial direction, and the eccentric shaft portion 156 is provided eccentrically with respect to the main shaft portion 155. The collar portion 157 is provided between the eccentric shaft portion 156 and the main shaft portion 155 in the axial direction, and extends in the direction orthogonal to the axial direction.

The main shaft portion 155 has a first portion 152, a second portion 154 and a third portion 153. The first portion 152, the third portion 153, and the second portion 154 are each cylindrical and are coaxially arranged in this order. In the axial direction, the upper end of the first portion 152 is connected to the eccentric shaft portion 156 via the collar portion 157, the lower end of the first portion 152 is connected to the upper end of the third portion 153, and the lower end of the third portion 153 is It is connected to the upper end of the second portion 154.

The diameter ΦF of the third portion 153 is smaller than the diameter ΦE of the first portion 152 and larger than the diameter ΦG of the second portion 154. For this reason, the diameter of the main shaft portion 155 gradually decreases from the eccentric shaft portion 156 side (upper end side) toward the opposite side (lower end side). The lower portion of the second portion 154 is immersed in the lubricating oil 114.

In addition, the diameter ΦF of the third portion 153 is set around the first through hole 121d so that the third portion 153 of the main shaft portion 155 is press-fitted and fixed in the first through hole 121d of the fixing portion 121c of the rotor 120. It is slightly larger than the diameter of the inner peripheral surface of the surrounding fixed portion 121c (the inner diameter of the fixed portion 121c, the diameter of the first through hole 121d). Therefore, the diameter ΦE of the first portion 152 is larger than the inner diameter of the fixed portion 121c, and the diameter ΦG of the second portion 154 is smaller than the inner diameter of the fixed portion 121c.

The block 123 has a cylinder bore 124. The cylinder bore 124 has a cylindrical shape whose central axis extends in the reciprocating direction. A piston 125 is reciprocally fitted in the cylinder bore 124 from one opening side of the cylinder bore 124. The other opening 126 of the cylinder bore 124 is covered with a valve plate 128, and the valve plate 128 is fixed to the cylinder bore 124 by a cylinder head 132. As a result, the compression chamber 130 surrounded by the cylinder bore 124, the piston 125 and the valve plate 128 is formed.

The piston 125 is connected to one end of the connecting rod 158 by a piston pin inserted into a small hole portion of the connecting rod 158. An eccentric shaft portion 156 is fitted in the large hole portion at the other end of the connecting rod 158. As a result, the piston 125 is connected to the eccentric shaft portion 156 via the connecting rod 158. The central axis of the piston pin is arranged parallel to the central axis of the eccentric shaft portion 156.

Therefore, the piston 125 reciprocates in the cylinder bore 124 due to the rotation of the eccentric shaft portion 156. At this time, the suction valve is opened, and the refrigerant gas 112 is sucked into the compression chamber 130 from the suction hole of the valve plate 128 covering the compression chamber 130.

On the other hand, the suction hole is closed by the suction valve, and the refrigerant gas 112 compressed in the compression chamber 130 is discharged from the compression chamber 130 to the discharge space of the cylinder head 132 via the discharge hole of the valve plate 128. Then, the refrigerant gas 112 is discharged from the hermetic compressor 100 by the discharge pipe communicating with the discharge space.

In addition to the cylinder bore 124, the block 123 has a first frame 136, a second frame 138, and a pair of connecting portions (first connecting portion 137 and second connecting portion 139), which are integrally formed. ing. Therefore, the number of parts can be suppressed and the product cost can be suppressed. In addition, these parts are not required to be assembled and workability is excellent.

As shown in FIGS. 1 and 2, the first frame 136 is a substantially plate-shaped body, and has a shaft support portion 140 and a thrust surface 142. The shaft support 140 has a cylindrical shape and projects downward from the surrounding portion. The first bearing hole 141 of the shaft support 140 extends in the axial direction and is arranged, for example, in the center of the first frame 136 in the orthogonal direction.

The first portion 152 of the main shaft portion 155 is rotatably inserted into the first bearing hole 141. The inner peripheral surface (first sliding surface) of the first frame 136 forming the first bearing hole 141 pivotally supports the first portion 152. Therefore, of the outer peripheral surface of the first portion 152, the portion (first sliding surface) facing the first sliding surface slides on the first sliding surface.

Further, the shaft support 140 is provided with a plurality of second insertion holes 147. The second insertion hole 147 is arranged so as to surround the periphery of the first bearing hole 141, and extends upward from the lower surface (mounting surface 146) of the shaft support 140.

The upper surface (thrust surface 142) of the first frame 136 extends in a direction orthogonal to the axial direction. A ball bearing 144 is arranged on the thrust surface 142 so as to surround the first bearing hole 141. The ball bearing 144 supports the load of the crankshaft 134 between the thrust surface 142 and the flange portion 157 of the crankshaft 134.

The first frame 136 has, for example, a substantially I-shape when viewed from above, and has a pair of end portions (first base end portion 136a and first tip end portion 136b) and a first extending portion provided therebetween. It has 136c. The shaft support 140 is arranged in the first extending portion 136c.

The first base end portion 136a is arranged closer to the cylinder bore 124 than the first tip end portion 136b in the reciprocating direction, and is arranged below the compression chamber 130 of the cylinder bore 124. For example, the first base end portion 136a has a rectangular shape when viewed from above, and the length S11 in the reciprocating direction is shorter than the width W11 in the orthogonal direction.

The first tip portion 136b has a substantially rectangular shape when viewed from above, and the side facing the closed container 102 is curved. Thus, the sharp corners of the first tip 136b do not hit the closed container 102, and damage to the closed container 102 and the first tip 136b can be prevented. In addition, for example, the width W12 in the orthogonal direction of the first tip portion 136b is longer than the length S12 in the reciprocating direction, and is the same as or substantially the same as the width W11 of the first base end portion 136a.

One end of the first extending portion 136c is connected to the first base end portion 136a and the other end thereof is connected to the first tip end portion 136b, and the first extension end 136c is reciprocated between the first base end portion 136a and the first tip end portion 136b. It is extended. For example, in the first extending portion 136c, the width W13 in the orthogonal direction is shorter than the length S13 in the reciprocating direction, and is shorter than the width W11 of the first base end portion 136a and the width W12 of the first tip end portion 136b. The center lines of the first base end portion 136a, the first tip end portion 136b, and the first extending portion 136c in the orthogonal direction are on the same straight line.

Therefore, the first frame 136 is provided with a first recess 136d that is recessed from each one side of the first base end portion 136a and the first tip end portion 136b in the orthogonal direction to one side of the first extending portion 136c. Further, the first frame 136 is provided with a first recess 136d that is recessed from each of the other sides of the first base end portion 136a and the first tip end portion 136b in the orthogonal direction to the other side of the first extending portion 136c. Thus, the first extending portion 136c is sandwiched between the pair of first recesses 136d in the orthogonal direction.

As shown in FIGS. 1 and 3, the second frame 138 is a substantially plate-shaped member, is arranged below the first frame 136 in parallel with the first frame 136, and has a second bearing hole 150. ing. The second bearing hole 150 extends in the axial direction and is arranged, for example, in the center of the second frame 138 in the orthogonal direction. For example, the first frame 136 and the second frame 138 are coaxially machined so that the central axis of the first bearing hole 141 and the central axis of the second bearing hole 150 are on the same straight line.

The second portion 154 of the main shaft portion 155 is rotatably inserted into the second bearing hole 150. An inner peripheral surface (second slid surface) of the second frame 138 surrounding the second bearing hole 150 pivotally supports the second portion 154. Therefore, a portion (second sliding surface) of the outer peripheral surface of the second portion 154 facing the second sliding surface slides on the second sliding surface. Further, the lower end of the second portion 154 projects below the lower surface of the second frame 138.

The second frame 138 has, for example, a substantially I-shape when viewed from below, and has a pair of end portions (a second base end portion 138a and a second tip portion 138b) and a second extending portion provided therebetween. 138c. The second bearing hole 150 is arranged in the second extending portion 138c.

The second proximal end portion 138a is arranged closer to the cylinder bore 124 than the second distal end portion 138b in the reciprocating direction. For example, the second base end portion 138a has a rectangular shape when viewed from above, and the length S21 in the reciprocating direction is shorter than the width W21 in the orthogonal direction.

The second tip portion 138b has a substantially rectangular shape when viewed from above, and the side facing the closed container 102 is curved. Thereby, the sharp corners of the second tip 138b do not hit the closed container 102, and damage to the closed container 102 and the second tip 138b can be prevented. Further, for example, the width W22 in the orthogonal direction of the second distal end portion 138b is longer than the length S22 in the reciprocating direction, and is the same as or substantially the same as the width W21 of the second base end portion 138a.

The second extending portion 138c has one end connected to the second proximal end portion 138a and the other end connected to the second distal end portion 138b, and is reciprocally moved between the second proximal end portion 138a and the second distal end portion 138b. It is extended. For example, in the second extending portion 138c, the width W23 in the orthogonal direction is shorter than the length S23 in the reciprocating direction, and is shorter than the width W21 of the second base end portion 138a and the width W22 of the second tip end portion 138b. The center lines of the second base end portion 138a, the second tip end portion 138b, and the second extending portion 138c in the orthogonal direction are on the same straight line.

Therefore, the second frame 138 is provided with a second recess 138d that is recessed from each one side of the second base end portion 138a and the second tip end portion 138b in the orthogonal direction to one side of the second extending portion 138c. Further, the second frame 138 is provided with a second recess 138d that is recessed from the other side of the second base end portion 138a and the second tip end portion 138b in the orthogonal direction to the other side of the second extending portion 138c. Thus, in the orthogonal direction, the second extending portion 138c is sandwiched between the pair of second recesses 138d.

The first connecting portion 137 and the second connecting portion 139 are plate-shaped or columnar, and extend in the axial direction between the first frame 136 and the second frame 138. The first connecting portion 137 and the second connecting portion 139 are arranged so as to sandwich the main shaft portion 155 between them in the reciprocating direction.

The first connecting portion 137 is arranged below the cylinder bore 124 so that the cylinder bores 124 overlap in the axial direction, and is arranged closer to the cylinder bore 124 than the second connecting portion 139 in the reciprocating direction.

For example, the length from the first bearing hole 141 to the first connecting portion 137 is equal to the length from the first bearing hole 141 to the second connecting portion 139, and the length from the second bearing hole 150 to the first connecting portion 137. The length is equal to the length from the second bearing hole 150 to the second connecting portion 139. As a result, the first connecting portion 137 and the second connecting portion 139 are arranged equidistant from the main shaft portion 155 inserted into the first bearing hole 141 and the second connecting portion 139.

The first connection portion 137 is connected to one end (first base end portion 136a) of the first frame 136 and one end (second base end portion 138a) of the second frame 138 in the reciprocating direction. The second connection portion 139 is connected to the other end (first tip portion 136b) of the first frame 136 and the other end (second tip portion 138b) of the second frame 138 in the reciprocating direction. Therefore, when viewed in the orthogonal direction, the first frame 136, the second frame 138, the first connecting portion 137, and the second connecting portion 139 are arranged in a square shape (rectangular shape).

Therefore, as shown in FIGS. 1 to 3, the block 123 is provided with an accommodation space surrounded by the first frame 136, the second frame 138, the first connecting portion 137, and the second connecting portion 139. A pair of openings (the first opening 133 and the second opening 135) of this accommodation space are open to the side surfaces of the block 123 in the orthogonal direction. The first opening 133 and the second opening 135 are arranged so as to sandwich the main shaft portion 155 between them in the orthogonal direction.

In the accommodation space of the block 123, it is sandwiched between the first frame 136 and the second frame 138 in the axial direction, and is sandwiched between the first connecting portion 137 and the second connecting portion 139 in the reciprocating direction. A motorized element 104 is housed. In the orthogonal direction, the electric element 104 is exposed to the outside from the accommodation space through the first opening 133 and the second opening 135.

In this accommodation space, the upper surface of the central cylindrical portion 116b of the stator 119 of the electric element 104 is brought into contact with the mounting surface 146 of the block 123, and the second insertion hole 147 of the shaft support portion 140 and the first insertion hole of the central cylindrical portion 116b. A fixing member 148 such as a bolt is inserted in 116c. Then, by fastening the fixing member 148, the fixed iron core 116 is fixed to the shaft support 140, and the stator 119 is attached to the first frame 136.

Here, the first frame 136 is arranged on the stator 119. The width W13 of the first extending portion 136c of the first frame 136 is smaller than the inner diameter R1 of the winding portion 118a. Therefore, the winding portion 118a and the portion of the fixed iron core 116 that is not covered by the winding portion 118a are exposed from the first recesses 136d on both sides of the first extending portion 136c.

<Operation of hermetic compressor>
In the hermetic compressor 100, when the stator 119 of the electric element 104 is energized from the power supply via the inverter circuit 101, a magnetic field is generated in the stator 119 and the rotor 120 rotates. By controlling the power supply frequency of the frequency of this current by the inverter circuit 101, the rotation speed of the rotor 120 changes according to the frequency.

This rotation causes the crankshaft 134 to rotate, and the piston 125 reciprocates in the cylinder bore 124 as the eccentric shaft portion 156 rotates. As a result, the refrigerant gas 112 is sucked into the compression chamber 130, compressed in the compression chamber 130, and discharged from the compression chamber 130.

<Assembly of hermetic compressor>
For example, the rotor 120 of the electric element 104 is positioned below the stator 119, and the electric element 104 is put into the accommodation space from the first opening 133 or the second opening 135 in the block 123. Then, the central cylindrical portion 116b of the stator 119 is brought into contact with the mounting surface 146 of the block 123, and the fixing member 148 is inserted into the second insertion hole 147 of the shaft supporting portion 140 and the first insertion hole 116c of the central cylindrical portion 116b. Then, the fixing member 148 is fastened. As a result, the stator 119 is attached to the block 123.

At this time, the widths W11, W12, W13 of the first frame 136 are smaller than the diameter Re of the annular space between the rotor 120 and the stator 119. The diameter Re is the inner diameter of the rotor 120. Therefore, the annular space is exposed from both ends of the first frame 136 in the orthogonal direction. Insert multiple leaves of the centering jig into this annular space. As a result, the dimensions between the rotor 120 and the stator 119 are made uniform, and the rotor 120 and the stator 119 are centered.

Then, in the first bearing hole 141 of the first frame 136, the second through hole 116a of the stator 119, the first through hole 121d of the fixing portion 121c, and the second bearing hole 150 of the second frame 138 in this order, The portion 155 is inserted from the second portion 154 side. The diameter of the second portion 154 is smaller than the diameter of each of the first bearing hole 141 and the first through hole 121d. Therefore, the second portion 154 can be inserted into the second bearing hole 150 without the second portion 154 hitting the first frame 136 and the fixing portion 121c. Accordingly, damage to the first frame 136 and the second portion 154 can be prevented.

Then, the third portion 153 is press-fitted into the first through hole 121d. As a result, the first through hole 121d and the main shaft portion 155 are coaxially arranged with respect to the first bearing hole 141 and the second bearing hole 150.

Further, the diameter ΦE of the first portion 152 is larger than the diameter ΦF of the third portion 153, and a step surface that expands from the third portion 153 to the first portion 152 is provided between them. The diameter ΦE of the first portion 152 is larger than the diameter of the first through hole 121d into which the third portion 153 is inserted. Accordingly, after the third portion 153 is press-fitted into the first through hole 121d, the step surface contacts the upper end of the fixed portion 121c. Accordingly, the fixing portion 121c and the third portion 153 can be easily positioned.

Subsequently, the leaf is extracted from the annular space, and the centering jig is removed from the electric element 104. Then, the block 123 is attached to the closed container 102 by the suspension spring 110. The suspension spring 110 has one end fixed to the bottom of the closed container 102 and the other end fixed to the lower surface of the second frame 138 of the block 123 by the support member 111.

The support member 111 is provided on each of the second proximal end portion 138a and the second distal end portion 138b of the second frame 138. As a result, the support members 111 are arranged so as to be separated from each other, so that the block 123 can be stably supported with respect to the closed container 102.

<Action and effect>
In the block 123, the first frame 136, the second frame 138, the first connection portion 137, and the second connection portion 139 are integrally formed, and the first frame 136 and the second frame 138 are connected to the first connection portion 137 and the second connection portion. They are connected by the part 139. As a result, the rigidity of the first frame 136 and the second frame 138 is improved, so that the first frame 136 and the first bearing hole 141 of the first frame 136 and the second bearing hole 150 of the second frame 138 at the time of simultaneous processing are The distortion of the second frame 138 can be reduced, and the accuracy of the concentricity of the first bearing hole 141 and the second bearing hole 150 can be improved. Therefore, between the first sliding surface of the first bearing hole 141 and the first sliding surface of the main shaft portion 155, and between the second sliding surface of the second bearing hole 150 and the second sliding surface of the main shaft portion 155. Twisting between the moving surface can be prevented. As a result, it is possible to suppress an increase in input power to the electric element 104 and realize the highly efficient hermetic compressor 100.

Further, the first connecting portion 137 is arranged below the cylinder bore 124 via the first frame 136, and the first connecting portion 137 and the second connecting portion 139 are arranged in the reciprocating direction of the piston 125 with the main shaft portion 155 interposed therebetween. There is. Accordingly, even when a large load acts on the cylinder bore 124 and the first frame 136 in the compression stroke of the piston 125, the load is received by the first connecting portion 137 and the second connecting portion 139, so that the cylinder bore 124 and The inclination of the first frame 136 can be suppressed. Therefore, it is possible to prevent twisting between the cylinder bore 124 and the piston 125, and between the first frame 136 and the main shaft portion 155.

Further, in the block 123, the first frame 136 and the second frame 138 are integrally formed. For this reason, for example, even if the block 123 collides with the closed container 102 due to shaking during transportation, the first bearing hole 141 of the first frame 136 and the second bearing hole 150 of the second frame 138 are unlikely to shift. Therefore, the twisting of the main shaft portion 155 due to the misalignment between the first bearing hole 141 and the second bearing hole 150 can be prevented.

Further, the electric element 104 is driven by the inverter circuit 101 at a plurality of frequencies. At this time, the higher the frequency of the electric element 104, the faster the rotor 120 rotates with respect to the stator 119. Further, the smaller the frequency of the electric element 104, the more difficult it becomes to form an oil film of the lubricating oil 114 on each sliding surface and each sliding surface. In any case, the main shaft portion 155 is likely to be twisted due to the misalignment between the first bearing hole 141 and the second bearing hole 150. On the other hand, since the misalignment is prevented by the first connecting portion 137 and the second connecting portion 139, it is possible to suppress the occurrence of prying and the increase in input power due to prying.

As shown in FIG. 2, since the width W13 of the first extending portion 136c of the first frame 136 is smaller than the inner diameter R1 of the winding portion 118a, the pair of first recesses 136d sandwiching the first extending portion 136c therebetween. Thus, the winding portion 118a and the fixed iron core 116 are exposed. As a result, even if the winding 118 and the fixed iron core 116 are heated by the energization of the winding 118, the heat is radiated from the first recess 136d. Moreover, since the heat radiation area of the winding 118 is expanded, the amount of heat radiation from the winding 118 is increased. Therefore, it is possible to suppress a decrease in efficiency of the electric element 104 due to heat.

As shown in FIG. 3, the second frame 138 covers the rotor 120. However, due to the pair of second concave portions 138d, the width of the second extending portion 138c of the second frame 138 is narrower than that of the second base end portion 138a and the second tip end portion 138b in the orthogonal direction. The width W23 of the second extending portion 138c is larger than the outer diameter R2 of the fixed portion 121c and smaller than the outer diameter R3 of the base surface portion 121a. Therefore, the second concave portion 138d shortens the distance from the first opening 133 and the second opening 135 to the fixing portion 121c. Therefore, the fixing portion 121c and the main shaft portion 155 can be easily fixed such as by welding, and the workability is excellent.

Furthermore, by providing the first recess 136d in the first frame 136 and the second recess 138d in the second frame 138, the first frame 136 and the second frame 138 can be downsized. Therefore, for example, when the block 123 is manufactured by casting, the first frame 136 and the second frame 138 can be easily cast out, and the block 123 can be molded. Therefore, the number of processing steps can be reduced and the productivity can be improved.

On the other hand, in the first frame 136, the width of the first base end portion 136a and the first tip end portion 136b connected to the first connection portion 137 and the second connection portion 139 is made larger than the width of the first extension portion 136c. You can In addition, in the second frame 138, the width of the second base end portion 138a and the second tip end portion 138b connected to the first connecting portion 137 and the second connecting portion 139 may be made larger than the width of the second extending portion 138c. You can Therefore, the first frame 136 and the second frame 138 can be more firmly connected to the first connecting portion 137 and the second connecting portion 139, and the inclination of the first frame 136 and the second frame 138 can be prevented. it can.

<Modification 1>
In FIG. 1, the base portion 121 a of the rotor 120 is arranged below the stator 119. However, the base surface portion 121a of the rotor 120 may be arranged above the stator 119. In this case, the lower surface of the fixed iron core 116 of the stator 119 is brought into contact with the upper surface of the second frame 138, and the fixing member 148 is inserted into the first insertion hole 116c of the fixed iron core 116 and the insertion hole of the second frame 138 and fastened. By doing so, the iron core and the first frame 136 may be fixed.

In this case, the width W23 of the second extending portion 138c of the second frame 138 is smaller than the inner diameter R1 of the winding portion 118a. Therefore, the portion of the fixed iron core 116 that is not covered by the winding portion 118a is exposed from the pair of second recesses 138d that sandwich the second extending portion 138c therebetween. Therefore, the heat of the fixed iron core 116 can be radiated from the second recess 138d, and the reduction in the efficiency of the hermetic compressor 100 due to the heat can be reduced.

<Modification 2>
In FIG. 1, the electric element 104 is an outer rotor type motor in which a stator 119 is arranged inside the rotor 120. On the other hand, as the electric element 104, an inner rotor type motor in which the rotor 120 is arranged inside the stator 119 may be used. Also in this case, since the first frame 136, the second frame 138, the first connection portion 137, and the second connection portion 139 are integrally formed in the block 123, the work can be performed while suppressing an increase in sliding loss. It is possible to improve the sex.

The diameter Re of the annular space is the inner diameter of the annular stator 119. In this case, the widths W11, W12, W13 of the first frame 136 are smaller than the diameter Re of the annular space. Therefore, similarly to the above, the stator 119 and the rotor 120 can be attached to the block 123 while being coaxial with each other.

<Modification 3>
In FIG. 1, the compressor body 108 is housed in the closed casing 102 so that the eccentric shaft portion 156 is located above the main shaft portion 155. On the other hand, the compressor body 108 may be housed in the closed casing 102 so that the eccentric shaft portion 156 is located below the main shaft portion 155.

In this case, in the block 123, the first frame 136 is arranged below the second frame 138. Therefore, the suspension spring 110 is fixed to the lower surface of the first frame 136 via the support member.

(Embodiment 2)
The refrigerating apparatus 200 according to the second embodiment includes a housing 201 and a refrigerating cycle 210, as shown in FIG. Hereinafter, a refrigerator will be described as the refrigerating apparatus 200, but the refrigerating apparatus 200 is not limited to the refrigerator.

The housing 201 includes a main body 202 and a door 203. The main body 202 has, for example, a rectangular parallelepiped shape, and has an opening and five walls. The door 203 is attached to the main body 202 so as to open and close the opening of the main body 202. The wall of the main body 202 and the door 203 are formed of a heat insulating material, and the internal space surrounded by the main body 202 and the door 203 is thermally insulated from the outside.

For example, a partition wall 208 is arranged in the internal space of the housing 201, and the internal space is partitioned by the partition wall 208 into a storage space 204 and a machine room 206. Articles are stored in the storage space 204, and a blower (not shown) is arranged therein.

The refrigeration cycle 210 is a circuit in which a refrigerant circulates (refrigerant circuit), and includes a hermetic compressor 100, a radiator 214, a decompression device 216, and a heat absorber 218, which are annularly connected by a pipe 220. There is. For example, the hermetic compressor 100, the radiator 214, and the decompression device 216 are arranged in the machine room 206, and the heat absorber 218 is arranged in the storage space 204.

In the refrigeration cycle 210, the refrigerant gas 112 compressed by the hermetic compressor 100 releases heat in the radiator 214 to become a liquid refrigerant at room temperature and high pressure. Then, the liquid refrigerant has a low pressure in the decompression device 216, absorbs heat in the heat absorber 218, is vaporized into the low-temperature and low-pressure refrigerant gas 112, and returns to the hermetic compressor 100.

The air cooled by the heat absorber 218 is circulated in the storage space 204 by a blower as shown by an arrow M in FIG. As a result, the storage space 204 is cooled.

As described above, in the refrigeration system 200, the first frame 136 and the second frame 138 are integrally formed in the block 123 of the hermetic compressor 100. As a result, an increase in sliding loss of the hermetic compressor 100 is suppressed, an increase in power consumption of the refrigerating apparatus 200 is suppressed, energy efficiency of the refrigerating apparatus 200 is improved, and the hermetic compressor 100 is also suppressed. Wear is reduced and the life of the refrigerating apparatus 200 is extended. Further, since the assembling workability is improved in the hermetic compressor 100, the productivity of the refrigeration system 200 can be increased.

It should be noted that the above description should be construed as an example only, and the present invention is provided for the purpose of teaching those skilled in the art the best mode for carrying out the present invention. The details of structure and/or function may be changed substantially without departing from the spirit of the invention.

INDUSTRIAL APPLICABILITY The hermetic compressor and the refrigerating apparatus of the present invention are useful as a hermetic compressor and a refrigerating apparatus that can suppress an increase in sliding loss.

100: Hermetic compressor 101: Inverter circuit 102: Hermetic container 104: Electric element 106: Compression element 112: Refrigerant gas 116: Fixed iron core (iron core)
118: Winding 119: Stator 120: Rotor 121c: Fixed part 123: Block 124: Cylinder bore 125: Piston 134: Crankshaft 136: First frame (bearing)
137: first connecting portion 138: second frame (bearing)
139: second connection part 141: first bearing hole 150: second bearing hole 152: first part 153: third part 154: second part 155: main shaft part 156: eccentric shaft part 158: connecting rod 200: refrigeration device 210 : Refrigeration cycle 214: radiator 216: decompression device 218: heat absorber 220: piping

Claims (6)

A compression element for compressing the refrigerant gas,
An electric element having a rotor and a stator, and driving the compression element;
A hermetic container that houses the compression element and the electric element,
The compression element is
A crankshaft having a main shaft portion and an eccentric shaft portion eccentrically provided on the main shaft portion;
A block having a cylindrical cylinder bore,
A piston that is connected to the eccentric shaft portion via a connecting rod and that is reciprocally provided in the cylinder bore;
In the block,
A first frame having a first bearing hole and axially supporting an inner peripheral surface of a first portion of the main shaft portion inserted into the first bearing hole;
A second bearing hole is provided, the second portion is provided on the opposite side of the main shaft portion opposite to the eccentric shaft portion side with the first portion interposed therebetween, and the second portion inserted into the second bearing hole is formed on the inner peripheral surface. A second frame that is axially supported and that is arranged so as to sandwich the electric element between the first frame and the first frame;
A hermetic compressor in which a first connecting portion and a second connecting portion connected to the first frame and the second frame are integrally formed. The hermetic compressor according to claim 1, wherein the first connecting portion and the second connecting portion are arranged in the reciprocating direction of the piston so as to sandwich the main shaft portion between each other. The stator has an iron core and a winding wound around the iron core,
In a direction orthogonal to the reciprocating direction of the piston, a portion of the iron core that is not wound by the winding is exposed from at least one end of the first frame and the second frame on the stator. The hermetic compressor according to claim 1 or 2. The rotor has a cylindrical fixing portion fixed to a third portion of the main shaft portion between the first portion and the second portion,
The hermetic compressor according to any one of claims 1 to 3, wherein a diameter of the third portion is smaller than a diameter of the first portion and larger than a diameter of the second portion. The hermetic compressor according to any one of claims 1 to 4, wherein the electric element is driven by an inverter circuit at a plurality of frequencies. A refrigeration system comprising a refrigeration cycle in which the hermetic compressor according to any one of claims 1 to 5, a radiator, a pressure reducing device, and a heat absorber are annularly connected by a pipe.

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