JP2007270679A - Hermetic rotary compressor - Google Patents

Abstract

A high-efficiency, low-noise hermetic rotary compressor is obtained by reducing distortion of a cylinder closing surface caused by fixing a discharge muffler.
An electric device, a rolling piston, a cylinder that houses the rolling piston, a flange that is fastened to the cylinder, closes the upper and lower end surfaces of the cylinder, and forms a compression chamber. The upper and lower bearings 5 and 6 having cylindrical portions that support the rotating shaft 3 that transmits the output of the device 2 and the opposite side of the lower bearing 6 to the side of the compression chamber are covered with a space to reduce the discharge noise of the refrigerant gas. The discharge muffler 10 fixed to the lower bearing 6 is a hermetic rotary compressor provided in the hermetic container 1, and the outer periphery of the discharge muffler 10 is formed in a flat step portion 10a, and the flat step portion 10a. Is pressed and in close contact with the lower surface of the outer periphery of the collar portion 6A of the lower bearing 6, and the discharge muffler 10 is pressed and in close contact with the lower end surface of the cylindrical portion 6B of the lower bearing 6 via the ring-shaped elastic member 11.
[Selection] Figure 1

Description

  The present invention relates to a hermetic rotary compressor used in a refrigerating and air conditioning system such as a room air conditioner, a packaged air conditioner, and a refrigerator, and more particularly to its structure.

  The hermetic rotary compressor includes an electric device, a rolling piston driven by the electric device, a cylinder that houses the rolling piston, and a compression chamber that is fastened to the cylinder and closes the upper and lower end surfaces of the cylinder. And a discharge muffler fixed to the bearing that covers the opposite side of the side surface of the compression chamber with a space and reduces the discharge noise of the refrigerant gas. In a sealed container. As such a hermetic rotary compressor, conventionally, when a discharge muffler is bolted to the lower bearing, the discharge muffler is press-fitted into the outer peripheral side surface of the lower bearing and hermetically sealed, and the lower end surface of the bearing portion is also sealed. A method of providing an elastic body and hermetically sealing each time a holding fixture for fixing the elastic body is pressed (for example, Patent Document 1) or a stepped structure with the outer peripheral portion of the discharge muffler as a flat support portion. There has been a method (for example, Patent Document 2) in which the bearing is sealed in close contact with the bearing.

Japanese Utility Model Publication No.59-24985 Utility registration No. 3077783

  However, in the conventional hermetic rotary compressor, since the discharge muffler is press-fitted into the outer peripheral side surface of the bearing collar, the cylinder closing surface of the bearing is distorted and deformed toward the compression chamber, and this strain causes a clearance from the rolling piston. There was a problem of reduction in compression efficiency and noise generation due to narrowing and high sliding loss.

  Further, in the case of a system in which an elastic body is provided on the lower end surface of the bearing and hermetically sealed as if the holder for fixing the elastic body is pressed, the number of parts increases and there is a problem in terms of cost.

  Furthermore, in the method in which a flat part is provided on the outer periphery of the discharge muffler to form a stepped structure, and the discharge muffler is tightly sealed to the outer periphery of the bearing using the flat part, the cylindrical part of the bearing that the discharge muffler contacts There is also a problem that the bearing is strongly pressed at the end face, and the cylinder closing surface of the bearing is distorted and deformed toward the compression chamber.

The present invention has been made to solve the above-described problems. The main object of the present invention is to reduce distortion deformation of the cylinder closing surface caused by fixing the discharge muffler, and to obtain a highly efficient and low noise hermetic rotary compressor. That is.
At the same time, it is to obtain a low-cost, high-efficiency, low-noise hermetic rotary compressor by simplifying the structure when fixing the discharge muffler.

  The present invention relates to an electric device, a rolling piston driven by the electric device, a cylinder that houses the rolling piston, and a flange that is fastened to the cylinder and closes the upper and lower end surfaces of the cylinder to form a compression chamber. And an upper and lower bearing having a cylindrical portion that supports a rotating shaft that transmits the output of the electric device, and a space opposite to the side of the compression chamber of the lower bearing is covered to reduce the discharge noise of the refrigerant gas. A hermetic rotary compressor having a discharge muffler fixed to the lower bearing in a sealed container, wherein an outer peripheral portion of the discharge muffler is formed in a flat step portion, and the flat step portion is formed on the lower bearing. The discharge muffler is pressed and brought into close contact with the lower end surface of the cylindrical portion of the lower bearing through a ring-shaped elastic member.

  An electric device; a rolling piston driven by the electric device; a cylinder that houses the rolling piston; a flange that is fastened to the cylinder and closes the upper and lower end surfaces of the cylinder to form a compression chamber; The upper and lower bearings having a cylindrical portion that supports the rotating shaft that transmits the output of the electric device, and the opposite side of the lower bearing to the side surface of the compression chamber covers a space to reduce the discharge noise of the refrigerant gas A hermetic rotary compressor having a discharge muffler fixed to a lower bearing in a sealed container, wherein an outer periphery of the discharge muffler is formed as a flat step portion, and the flat step portion is a flange of the lower bearing. The discharge muffler is pressed and brought into close contact with an annular groove formed in the lower end surface of the cylindrical portion of the lower bearing.

  Furthermore, an electric device, a rolling piston driven by the electric device, a cylinder that houses the rolling piston, a flange that is fastened to the cylinder and closes the upper and lower end surfaces of the cylinder to form a compression chamber, and the electric motor An upper and lower bearing having a cylindrical portion that supports a rotating shaft that transmits the output of the apparatus, and a side opposite to the side of the compression chamber of one of the upper and lower bearings is covered with a space to discharge refrigerant gas. A hermetic rotary compressor having a discharge muffler for reducing refrigerant in a sealed container, the discharge port for discharging refrigerant gas into the discharge muffler formed by the one bearing and the discharge muffler Formed on the discharge valve seat thin wall portion of the bearing, and the compression chamber side surface of the discharge valve seat thin wall portion is a concave surface recessed from the compression chamber side surface of the bearing other than the discharge valve seat thin wall portion.

  According to the present invention, the outer peripheral portion of the discharge muffler is formed in a flat step portion, and the flat step portion is pressed and brought into close contact with the lower surface of the lower outer peripheral portion of the lower bearing, and the ring-shaped elastic member is attached to the lower end surface of the cylindrical portion of the lower bearing Since the discharge muffler is pressed and brought into close contact with each other through the member, the close contact portions are sealed, and distortion deformation of the cylinder closing surface of the lower bearing toward the compression chamber is reduced. Therefore, sliding loss between the lower bearing and the rolling piston is reduced, and a hermetic rotary compressor with high compression efficiency, high efficiency and low noise can be obtained. In addition, since the effect can be realized with a simpler structure as compared with Patent Document 1, etc., an inexpensive and high-performance hermetic rotary compressor can be obtained.

  An annular groove formed on the lower end surface of the bottom portion of the cylindrical portion of the lower bearing, wherein the outer peripheral portion of the discharge muffler is formed into a flat step portion, and the flat step portion is pressed and brought into close contact with the lower surface of the outer peripheral portion of the lower bearing. Even if the discharge muffler is pressed and brought into close contact with each other, substantially the same effect as described above can be obtained.

  Further, a discharge port for discharging refrigerant gas into a discharge muffler formed by the one bearing and the discharge muffler is formed in the discharge valve seat thin portion of the one bearing, and the compression of the discharge valve seat thin portion Since the chamber side surface is a concave surface that is recessed from the compression chamber side surface of the bearing other than the discharge valve seat thin portion, even if the discharge valve seat thin portion is distorted to the compression chamber side during compressor operation, the rolling piston In addition, a high efficiency hermetic rotary compressor with low sliding loss can be obtained without reducing the clearance.

Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a longitudinal sectional view of a hermetic rotary compressor according to Embodiment 1 of the present invention, and FIG. 2 is a detailed bottom view of the hermetic rotary compressor according to Embodiment 1. FIG.

  As shown in FIG. 1, the hermetic rotary compressor according to the first embodiment includes an electric device 2 such as an electric motor in a hermetic container 1, a rotating shaft 3 that transmits a rotation output of the electric device 2, and an electric device 2. The cylinder 4 disposed at the bottom, the top and bottom open end surfaces of the cylinder 4 are closed, the compression chamber 14 is formed and the top and bottom bearings (upper bearing 5 and lower bearing 6) that support the rotating shaft 3, and the eccentric portion of the rotating shaft 3 A rolling piston 9 that is integrally fitted and mounted and accommodated in a cylinder 4 and a discharge muffler 10 that is fixed to the lower bearing 6 are provided.

The upper bearing 5 and the lower bearing are fastened and fixed to the cylinder 4 by 6 bolts 7 and 8. In the upper bearing 5 and the lower bearing 6, a portion that is fastened to the cylinder 4 and closes the cylinder 4 to form a compression chamber is a flange portion, and a portion that supports the rotating shaft 3 that transmits the output of the electric device 2. It is called a cylinder part. And those of the lower bearing 6 are particularly expressed as a flange portion 6A and a cylindrical portion 6B. The discharge muffler 10 is fastened and fixed to the flange 6A of the lower bearing 6 with bolts 8.
The hermetic rotary compressor further includes a ring-shaped elastic member (for example, a resin or rubber member) provided between the lower end surface 6b of the cylindrical portion 6B of the lower bearing 6 and the annular protrusion 10b of the discharge muffler 10 corresponding thereto. 11) A discharge pipe 12 for sending the refrigerant gas to the refrigeration air conditioning system, an accumulator 13 for storing the refrigerant flowing in from the refrigeration circuit, and a suction pipe 15 for guiding the refrigerant from the accumulator 13 to the compression chamber 14 in the cylinder 4 are provided.

  The discharge muffler 10 has a stepped structure having a flat stepped portion 10a in contact with the outer peripheral lower surface 6a of the flange portion 6A of the lower bearing 6 on the outer peripheral portion, and the flat loaded step portion 10a is formed on the outer peripheral lower surface 6a of the flange portion 6A. It is pressed and brought into close contact with each other and is in a sealed state. Further, the discharge muffler 10 is formed as an annular protrusion 10b in which a portion corresponding to the lower end surface 6b of the cylindrical portion 6B of the lower bearing 6 protrudes in an annular shape, and the annular protrusion 10b is interposed between the lower bearing 6 and the elastic member 11. The cylinder portion 6B is pressed and brought into close contact with the lower end surface 6b of the cylinder portion 6B to be in a sealed state. The pressing between the flat shoulder portion 10a and the flange portion 6A outer peripheral lower surface 6a and the pressing between the annular projection portion 10b and the cylindrical portion 6B lower end surface 6b are caused by fastening the bolt 8 between the discharge muffler 10 and the lower bearing 6. Yes.

Next, the operation of the hermetic rotary compressor configured as described above will be described. The rotational force of the electric device 2 is transmitted to the rolling piston 9 by the rotating shaft 3. Then, the rolling piston 9 fitted and attached to the eccentric portion of the rotating shaft 3 in the compression chamber 14 in the cylinder 4 performs eccentric rotational movement, whereby the refrigerant gas is sucked into the compression chamber 14 from the suction pipe 15. Compressed. The compressed refrigerant gas is discharged from the discharge port 16 provided in the lower bearing 6 into the discharge muffler 10 and then guided into the hermetic container 1 to cool the electric device 2 to be provided at the upper part of the container 1. The discharged discharge pipe 12 flows into the refrigeration air conditioning system.
An accumulator 13 provided adjacent to the sealed container 1 gas-liquid separates the refrigerant returned from the refrigeration cycle and prevents the liquid refrigerant from flowing into the cylinder 4 through the suction pipe 15.

  The discharge muffler 10 attached to the lower bearing 6 has a function of reducing the discharge sound of the refrigerant gas, but the lower bearing is provided so that the refrigerant gas does not blow out into the refrigerating machine oil 17 stored at the bottom of the sealed container 1. The discharge muffler 10 is closely attached to 6 and sealed. The refrigerant gas discharged into the discharge muffler 10 is discharged into the sealed container 1 after being guided upward from the flow path that penetrates the cylinder 4. The refrigerating machine oil 17 is supplied to each sliding part by utilizing the centrifugal force generated in the hollow hole provided inside the rotating shaft 3 as the rotating shaft 3 rotates. The hole 10c is smaller than the diameter of the hollow hole of the rotating shaft 3, and increases the flow rate of the refrigerating machine oil 17 passing therethrough and increases the oil supply force.

As described above, the lower bearing 6 and the discharge muffler 10 fixed to the cylinder 4 need to be sealed so that the refrigerant gas does not blow out into the refrigerating machine oil 17 stored at the bottom of the hermetic container 1. It is. For this reason, as shown in FIG. 2, a ring-shaped elastic member 11 is attached to the lower end surface 6 b of the cylindrical portion 6 </ b> B of the lower bearing 6, and the annular projection 10 b of the discharge muffler 10 is made elastic by the fastening force of the bolt 8. The lower end surface 6b of the cylindrical portion 6B of the lower bearing 6 is pressed through the seal, and the portion is tightly sealed. At this time, the elastic member 11 has an effect of suppressing the pressure of the discharge muffler 10 that is too strong to obtain an appropriate pressure and increasing the degree of adhesion.
In addition, the discharge muffler 10 has a stepped structure in which the outer peripheral portion of the discharge muffler 10 has a flat stepped portion 10 a, and the flange portion 6 A outer peripheral lower surface 6 a of the lower bearing 6 is attached to the flat stepped portion 10 a by the fastening force of the bolt 8. Is pressed so that the flat shoulder 10a of the discharge muffler 10 is tightly sealed to the flange 6A outer peripheral lower surface 6a of the lower bearing 6.

  FIG. 3 is a comparative explanatory view of distortion deformation generated on the cylinder closing surface of the lower bearing 6 in accordance with the fixing mode of the discharge muffler 10. FIG. 3C is a state diagram in the case of the first embodiment, and the strain deformation generated on the cylinder closing surface of the lower bearing 6 is indicated by a broken line. On the other hand, FIG. 3A shows a configuration in the case where the elastic member 11 is not provided on the lower end surface 6b of the cylinder portion 6B, and FIG. 3B shows that the elastic member 11 is provided, but the flange portion 6A of the lower bearing 6 is provided. The discharge muffler 10 is press-fitted and sealed on the outer peripheral side surface 6c, and the distortion deformation generated on the cylinder closing surface of the lower bearing 6 in these cases is indicated by a broken line. The black arrow in FIG. 3 indicates the pressing force that the discharge muffler 10 acts on the lower bearing 6.

In the hermetic rotary compressor of the first embodiment, the flat step portion 10a on the outer peripheral portion of the discharge muffler 10 is tightly sealed to the lower surface 6a of the outer periphery 6A of the lower bearing 6 and the lower end surface 6b of the cylindrical portion 6B of the lower bearing 6 is sealed. Thus, the discharge muffler 10 is tightly sealed via the ring-shaped elastic member 11, thereby reducing the stress generated on the cylinder closing surface of the lower bearing 6. The distortion deformation generated on the cylinder closing surface of the lower bearing 6 at this time can be expressed as indicated by a broken line in FIG.
On the other hand, in FIGS. 3A and 3B, the stress generated on the cylinder closing surface of the lower bearing 6 due to the pressing force that the discharge muffler 10 acts on the lower bearing 6 is shown in FIG. Therefore, the distortion deformation generated on the cylinder closing surface of the lower bearing 6 increases as compared with FIG. 3C, as indicated by the broken lines in FIG. 3A and FIG. 3B, respectively. .

  According to the hermetic rotary compressor of the first embodiment, the flat step portion 10a on the outer peripheral portion of the discharge muffler 10 is tightly sealed to the flange portion 6A outer peripheral lower surface 6a of the lower bearing 6 and the bottom portion 6B of the lower bearing 6 is below the cylinder portion 6B. Since the discharge muffler 10 is tightly sealed to the end surface 6b via the ring-shaped elastic member 11, the stress generated on the cylinder closing surface of the lower bearing 6 is reduced, so that the lower bearing 6 and the discharge muffler 10 are fastened. The distortion deformation of the cylinder closing surface of the lower bearing 6 is reduced as compared with the conventional fixing method. Thereby, a compressor with low sliding loss, high efficiency, and low noise can be obtained.

  Further, the lower bearing 6 and the discharge muffler 10 are tightly sealed by pressing the lower end surface 6b of the cylindrical portion 6B of the lower bearing 6 with the ring-shaped elastic member 11 by the annular protrusion 10b of the discharge muffler 10. Compared to the conventional method in which an elastic body is provided on the lower end surface of the bearing portion and hermetically sealed with a discharge muffler every time the holder for fixing the elastic member is pressed, a low-cost compressor is obtained. Contribute.

Embodiment 2. FIG.
FIG. 4 is a detailed view of the bottom of a hermetic rotary compressor according to Embodiment 2 of the present invention, and an enlarged view of a part of the round frame is added. In addition, the same code | symbol is attached | subjected to the same structure as Embodiment 1, and detailed description is abbreviate | omitted.

  As shown in FIG. 4, the second embodiment replaces the ring-shaped elastic member 11 used in the first embodiment with the tight contact at the lower end surface 6 b of the cylindrical portion 6 </ b> B of the lower bearing 6. This is performed using the annular groove 6d formed in the lower end surface 6b of the portion 6B, and is otherwise the same as in the first embodiment.

  That is, when the annular groove 6d is formed in the lower end surface 6b of the cylindrical portion 6B of the lower bearing 6 and the discharge muffler 10 is fastened to the lower bearing 6 by the bolt 8, the annular protrusion of the discharge muffler 10 is generated by the fastening force. 10b presses the annular groove 6d, the annular protrusion 10b comes into close contact with the portion of the annular groove 6d, and the lower bearing 6 and the discharge muffler 10 are sealed by the groove 6d.

  According to the hermetic rotary compressor of the second embodiment, when the discharge muffler 10 is fastened and fixed to the lower bearing 6 with the bolts 8, it is elastically deformed so that the curved portion of the annular protrusion 10b of the discharge muffler spreads. As a result, the pressure on the lower end surface 6b of the cylindrical portion 6B of the lower bearing 6 is adjusted appropriately, so that the lower bearing 6 and the discharge muffler 10 can be connected in a state where distortion deformation of the cylinder closing surface of the lower bearing 6 is reduced. Can be sealed. As a result, performance degradation and noise increase due to an increase in sliding loss due to distortion deformation on the side surface of the compression chamber are prevented, and the same effect as in the first embodiment can be obtained.

  Further, this method of tightly sealing the lower bearing 6 and the discharge muffler 10 by pressing the annular protrusion 10b of the discharge muffler 10 against the annular groove d of the lower end surface 6b of the cylindrical portion 6B of the lower bearing 6 is a conventional method. Compared to a method in which an elastic body is provided on the lower end surface of the bearing portion and hermetically sealed with a discharge muffler every time the holder for fixing the elastic body is pressed, the number of parts is reduced, contributing to obtaining a low-cost compressor.

Embodiment 3 FIG.
5 is a detailed view of the bottom of a hermetic rotary compressor according to Embodiment 3 of the present invention. In addition, the same code | symbol is attached | subjected to the same structure as Embodiment 1, and detailed description is abbreviate | omitted.

  As shown in FIG. 5, also in the third embodiment, the outer peripheral portion of the discharge muffler 10 has a stepped structure formed in the flat stepped portion 10a as in the first and second embodiments. However, in the third embodiment, the flange portion 6A of the lower bearing 6 is extended to the outer periphery (outside) from the contact portion with the end surface of the cylinder 4, and the flat step portion 10a of the discharge muffler 10 is provided at the outer peripheral end of the extension portion. A flat surface 6a 'for receiving is provided, and the flat surface 6a' and the flat step portion 10a are tightly sealed.

  In the first embodiment and the second embodiment, since the flat stepped portion 10a provided on the outer periphery of the discharge muffler 10 is configured to be located inside the contact surface of the lower bearing 6 with the cylinder 4, the lower bearing 6, the outer diameter of the discharge muffler 10 is reduced and the sealed muffler space is reduced accordingly (for reference, FIG. The outer peripheral position of the discharge muffler 10 in the case of the first embodiment and the second embodiment is indicated by a broken line). Therefore, the configuration of the third embodiment is adopted in order to maintain the muffler space in the same size as the conventional one and to make the muffler effect of the discharge muffler 10 sufficient.

  According to the hermetic rotary compressor of the third embodiment, the flat surface 6a ′ of the lower bearing 6 brim portion 6A that receives the flat shoulder portion 10a of the outer peripheral portion of the discharge muffler 10 is brought into contact with the cylinder 4 of the lower bearing 6. Since the structure is provided at the outer peripheral (outside) position of the surface, a discharge muffler inner volume equivalent to the method in which the discharge muffler 10 is press-fitted into the outer peripheral side surface of the flange portion 6A of the lower bearing 6 is obtained. Thereby, in addition to the effects of the first and second embodiments, a compressor that does not impair the silencing effect of the discharge muffler 10 can be obtained. In addition, the flat bearing surface 6a ′ of the third embodiment is changed to the second embodiment. You may apply.

Embodiment 4 FIG.
6 is a detailed view of the bottom of a hermetic rotary compressor according to Embodiment 4 of the present invention. In addition, the same code | symbol is attached | subjected to the same structure as Embodiment 1, and detailed description is abbreviate | omitted.

  As shown in FIG. 6, in Embodiment 4, the discharge muffler 10 is press-fitted and fixed to the outer periphery 6e of the lower end region of the cylindrical portion 6A of the lower bearing 6, and the lower bearing 6 and the discharge muffler 10 are not bolted. It is what. Accordingly, a concave portion having a diameter slightly smaller than the outer diameter of the outer periphery 6e of the lower end region of the cylindrical portion 6A is formed in advance in a portion corresponding to the lower end region of the lower bearing 6 cylindrical portion 6A of the discharge muffler 10. Further, the inner circumference of the lower end region of the cylindrical portion 6A of the lower bearing 6 is larger than the other basic diameter portion, and even if the portion is distorted by the press-fitting of the discharge muffler 10, the distorted deformation protrudes inward from the basic diameter portion. To prevent you from doing. In addition, this enlarged diameter part is called the deformation | transformation relief part 6f here.

  According to the configuration of the fourth embodiment, the discharge muffler 10 is press-fitted and fixed to the outer periphery 6e of the lower end region of the cylindrical portion 6A of the lower bearing 6. The outer periphery of the discharge muffler 10 is the same as in the first and second embodiments. The flat stepped portion 10a of the discharge muffler 10 is pressed by the press-fitting of the discharge muffler 10 and the flange 6A outer peripheral lower surface 6a of the lower bearing 6 Is pressed and tightly sealed. A ring-shaped elastic member 11 is attached to the lower end surface 6b of the cylindrical portion 6B of the lower bearing 6, and the annular protrusion 10b of the discharge muffler 10 presses it. With this configuration, the pressing force of the flat step portion 10a of the discharge muffler 10 against the flange 6A outer peripheral lower surface 6a of the lower bearing 6 is appropriately set without being too strong, and the elastic member 11 is excessively caused by the annular protrusion 10b of the discharge muffler 10. The discharge muffler 10 can be tightly sealed to the lower bearing 6 without absorbing a pressing force and causing the cylinder blocking surface of the lower bearing 6 to be distorted and deformed. Thereby, the sliding loss resulting from the distortion deformation of the compression chamber 14 side surface can be suppressed, and a highly efficient and low noise compressor can be obtained.

  In addition, since the deformation relief portion 6f having an enlarged diameter is provided on the inner diameter side corresponding to the outer periphery 6e of the lower end region of the cylindrical portion 6B of the lower bearing 6 into which the discharge muffler 10 is press-fitted, the discharge muffler 10 is press-fitted and fixed. Even if distortion occurs in the cylindrical portion 6B at this time, the deformation relief portion 6f prevents the distortion deformation from protruding inward from the basic inner diameter of the lower bearing 6. For this reason, it is possible to prevent performance degradation and noise increase due to an increase in sliding loss between the lower bearing 6 and the rotary shaft 3 due to strain deformation.

  Further, since the discharge muffler 10 is press-fitted and fixed to the lower bearing 6 and the bolts are not fastened between them, the local stress generated in the bolt fastening portion is not generated. Therefore, the entire outer periphery of the discharge muffler 10 is evenly distributed. Since the force which presses the lower bearing 6 is applied, the discharge muffler 10 and the lower bearing 6 are reliably hermetically sealed, and a highly efficient compressor with low leakage loss and sliding loss can be obtained. Note that this configuration in which the discharge muffler 10 is press-fitted into the cylindrical portion 6B of the lower bearing 6 may be applied to the second embodiment.

Embodiment 5 FIG.
FIG. 7 is a detailed view of the bottom of the hermetic rotary compressor, and is an explanatory view (a) in which the discharge valve seat thin portion 18 has no concave surface and a side sectional view of the discharge valve seat thin portion 18 according to Embodiment 5 (b). ) And a plan view (c). In addition, the same code | symbol is attached | subjected to the same structure as Embodiment 1, and detailed description is abbreviate | omitted.

  In the fifth embodiment, the discharge port 16 that discharges the refrigerant gas into the discharge muffler formed by one of the upper bearing 6 or the lower bearing 6 and the discharge muffler 10 has the one of the bearings 5 and 6. The discharge valve seat thin portion 18 is formed as a concave surface 19 in which the compression chamber side surface of the discharge valve seat thin portion 18 is recessed from the compression chamber side surface other than the discharge valve seat thin portion 18.

  The cross-sectional view of FIG. 7A basically has the same configuration as that of FIG. 1 and FIG. 2 of the first embodiment. On the other hand, in the side sectional view of FIG. 7B and the plan view of FIG. 7C, the side surface of the compression chamber of the discharge valve seat thin portion 18 formed in the lower bearing 6 is the discharge valve seat thin portion 18. It represents that it is a concave surface 19 that is recessed from the compression chamber 14 side surface of the lower bearing 6 other than the above.

  The discharge port 16 for discharging the refrigerant gas into the discharge muffler 10 is opened and closed by a cantilevered discharge valve 20. In order to reduce the pressure loss of the discharged refrigerant gas, the discharge port 16 is disposed between the compression chamber 14 and the discharge valve 20. Therefore, it is necessary to reduce the dead volume formed as much as possible. For this reason, the discharge port 16 and the discharge valve 20 are provided in the discharge valve seat thin portion 18 which is a thin portion formed in the collar portion 6A of the lower bearing 6.

  However, when the discharge valve seat thin portion 18 is used as a reference, the pressure Pc in the compression chamber 14 during the operation of the compressor is smaller than the pressure Pd in the discharge muffler 10. 7 (a), as indicated by the broken line in the round frame, the deformation may occur in the compression chamber side. When this distortion deformation occurs, the clearance with the rolling piston is narrowed, leading to a decrease in compression efficiency and an increase in noise due to an increase in sliding loss.

  Therefore, as shown in FIGS. 7B and 7C, the portion on the compression chamber 14 side corresponding to the discharge valve seat thin portion 18 of the lower bearing collar 6A is about several μm with respect to the other portions. The processed concave surface 19 is used as a deformation relief portion 19.

  According to the hermetic rotary compressor of the fifth embodiment, by providing the deformation relief portion 19, even if the discharge valve seat thin portion 18 is distorted and deformed toward the compression chamber 14 during the operation of the compressor, the rolling piston 9 and Therefore, a high-efficiency compressor with reduced sliding loss can be obtained.

  Here, the combination with the first embodiment is shown as an example, but the configuration of the concave surface 19 of the discharge valve seat thin portion 18 shown in the fifth embodiment is exemplified in the second to fourth embodiments or here. It may be combined with other forms that are not provided, for example, a configuration in which the upper bearing 6 is provided with the discharge muffler 10 and the discharge port 16.

1 is a longitudinal sectional view of a hermetic rotary compressor according to Embodiment 1 of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a bottom detail view of a hermetic rotary compressor according to a first embodiment of the present invention. It is comparative explanatory drawing of the distortion deformation which arose in the cylinder obstruction | occlusion surface of the lower bearing according to the fixed aspect of a discharge muffler. It is a bottom detail drawing of the hermetic type rotary compressor concerning Embodiment 2 of this invention. It is a bottom detail drawing of a closed type rotary compressor concerning Embodiment 3 of this invention. It is a bottom detail drawing of the closed type rotary compressor which concerns on Embodiment 4 of this invention. It is detail drawing of the bottom part of a hermetic type rotary compressor, Comprising: (a) when discharge valve seat thin part does not have a concave surface, and sectional side view (b) which shows discharge valve seat thin part concerning Embodiment 5 And a plan view (c).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container, 2 Electric drive device, 3 Rotating shaft, 4 Cylinder, 5 Upper bearing, 6 Lower bearing, 6A Bottom bearing collar, 6B Bottom bearing cylinder, 6a Bottom bearing collar lower surface, 6a 'Flat Surface, 6b lower end surface of the cylindrical portion of the lower bearing, 6d annular groove on the lower end surface of the cylindrical portion of the lower bearing, 6e outer periphery of the lower end region of the cylindrical portion of the lower bearing, 6f deformation relief portion (expanded diameter portion) of the lower end region of the cylindrical portion, 7 upper bearing Fastening bolt, 8 Lower bearing fastening bolt, 9 Rolling piston, 10 Discharge muffler, 10a Flat stepped portion on the outer periphery of the discharge muffler, 10b Ring protrusion of the discharge muffler, 10c Oil supply hole of the discharge muffler, 11 Ring-shaped elastic member, 12 Discharge pipe, 13 accumulator, 14 compression chamber, 15 suction pipe, 16 discharge port, 17 refrigerating machine oil, 18 discharge valve seat thin part, 19 deformation relief part (concave surface) of discharge valve seat thin part, 20 discharge valve.

Claims (6)

An electric device, a rolling piston driven by the electric device, a cylinder that houses the rolling piston, a flange that is fastened to the cylinder and closes the upper and lower end surfaces of the cylinder to form a compression chamber, and the electric device An upper and lower bearing having a cylindrical portion that supports a rotating shaft that transmits the output of the lower bearing, and a lower bearing that covers a side opposite to the side surface of the compression chamber of the lower bearing so as to reduce the discharge noise of the refrigerant gas. A hermetic rotary compressor equipped with a fixed discharge muffler in a hermetic container,
An outer periphery of the discharge muffler is formed as a flat step, and the flat step is pressed against and closely contacted with a lower surface of the outer periphery of the flange portion of the lower bearing, and a ring-shaped elastic member is provided on the lower end surface of the cylindrical portion of the lower bearing. A hermetic rotary compressor, wherein the discharge muffler is pressed and brought into close contact. An electric device, a rolling piston driven by the electric device, a cylinder that houses the rolling piston, a flange that is fastened to the cylinder and closes the upper and lower end surfaces of the cylinder to form a compression chamber, and the electric device An upper and lower bearing having a cylindrical portion that supports a rotating shaft that transmits the output of the lower bearing, and a lower bearing that covers a side opposite to the side surface of the compression chamber of the lower bearing so as to reduce the discharge noise of the refrigerant gas. A hermetic rotary compressor equipped with a fixed discharge muffler in a hermetic container,
An outer peripheral portion of the discharge muffler is formed in a flat step portion, and the flat step portion is pressed and brought into close contact with a lower surface of the outer periphery of the flange portion of the lower bearing, and an annular groove formed in a lower end surface of the cylindrical portion of the lower bearing A hermetic rotary compressor characterized in that a discharge muffler is pressed and brought into close contact.   The sealed rotation according to claim 1 or 2, wherein the discharge muffler is press-fitted and fixed to the outer periphery of the lower end region of the cylindrical portion of the lower bearing whose inner periphery is expanded in diameter from other regions. Compressor.   The hermetic rotary compressor according to any one of claims 1 to 3, wherein the lower bearing has a flat surface that receives the flat step portion of the discharge muffler at an outer peripheral position from a contact portion with the cylinder. .   A discharge port for discharging refrigerant gas into a discharge muffler formed by the lower bearing and the discharge muffler is formed in the discharge valve seat thin portion of the lower bearing, and the side surface of the compression chamber of the discharge valve seat thin portion is The hermetic rotary compressor according to any one of claims 1 to 4, wherein the rotary bearing is a concave surface recessed from the compression chamber side surface of the lower bearing other than the discharge valve seat thin portion. An electric device, a rolling piston driven by the electric device, a cylinder that houses the rolling piston, a flange that is fastened to the cylinder and closes the upper and lower end surfaces of the cylinder to form a compression chamber, and the electric device The upper and lower bearings having a cylindrical portion that supports the rotating shaft that transmits the output of the first and second bearings, and the opposite side of the one of the upper and lower bearings to the side of the compression chamber is covered with a space to discharge refrigerant gas. A hermetic rotary compressor equipped with a reduced discharge muffler in a hermetic container,
A discharge port for discharging refrigerant gas into a discharge muffler formed by the one bearing and the discharge muffler is formed in the discharge valve seat thin portion of the one bearing, and the side surface of the compression chamber of the discharge valve seat thin portion Is a concave surface recessed from the compression chamber side surface of the bearing other than the discharge valve seat thin portion.

Images