JP2012087712A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic compressor that does not seal refrigerant gas in a cavity of a piston pin.SOLUTION: A piston 23 configuring a compression element 15 arranged in a sealed container 1 includes: a piston-pin hole 37; and the cylindrical piston pin 35 inserted into the piston-pin hole 37 and having the cavity 49. In addition, the piston pin 35 and the piston 23 includes a fist through-hole 51a and a second through-hole 39 which communicate the cavity 49 of the piston pin 35 into the sealed container 1. As a result, sealing of the refrigerant gas having leaked to the cavity 49 of the piston pin 35 is prevented, and vibration of the compressor associated with a blowout of the sealed refrigerant gas is reduced.

Description

  The present invention relates to a hermetic compressor used in a refrigeration cycle apparatus such as a refrigerator-freezer.

  Some conventional hermetic compressors include a lock pin that allows a part of refrigerant gas to flow out from a piston in order to reduce noise during operation (see, for example, Patent Document 1).

  Hereinafter, the conventional hermetic compressor will be described with reference to the drawings.

  FIG. 8 is a longitudinal sectional view of a conventional hermetic compressor described in Patent Document 1. FIG. 9 is a cross-sectional view of the conventional hermetic compressor. FIG. 10 is an enlarged cross-sectional view of a main part of the conventional hermetic compressor.

  8 to 10, the sealed container 101 includes a discharge pipe 102 and a suction pipe 103 connected to a cooling system (not shown), stores lubricating oil 105 in the bottom 104, and rotates with the stator 106. An electric element 108 composed of a child 107 and a compression element 109 driven thereby are accommodated.

  The compression element 109 is elastically supported in the sealed container 101 by a plurality of coil springs 111, a cylinder 113 having a compression chamber 112, a piston 114 reciprocally inserted into the compression chamber 112, and a main shaft. Shaft 118 having a portion 115 and an eccentric shaft portion 116, a bearing portion 117 that supports the eccentric shaft portion 116 side, a connecting rod 120 that connects the eccentric shaft portion 116 and the piston 114, and a piston that connects the piston 114 and the connecting rod 120. The rotor 121 is fixed to the main shaft portion 115, and the stator 106 is fixed to the cylinder 113.

  As shown in FIG. 10, the piston 114 has a piston pin hole 125 on the side of the anti-compression chamber 112 and a pin hole 126 that penetrates the piston pin hole 125.

  The connecting rod 20 includes a large end portion 130 loosely fitted to the eccentric shaft portion 116 and a small end portion 131 that substantially coincides with the piston pin hole 125 of the piston 114.

  The substantially cylindrical piston pin 121 includes a hollow portion 132 and a lock pin hole 133, and is fitted and press-fitted into the piston pin hole 125 of the piston 114 and the small end portion 131 of the connecting rod 120. The hole 126 and the lock pin hole 133 of the piston pin 121 are connected, and the connecting rod 120 and the piston 114 are connected so as to be swingable.

  The operation of the hermetic compressor configured as described above will be described below.

  When the electric element 108 is energized, the rotor 107 rotates, and the shaft 118 is also rotationally driven accordingly. At this time, the eccentric rotational motion of the eccentric shaft portion 116 is transmitted to the piston 114 via the connecting rod 120, so that the piston 114 reciprocates in the compression chamber 112.

As the piston 114 reciprocates, the refrigerant in the sealed container 101 is sucked into the compression chamber 112 from the suction muffler 137, and low-pressure refrigerant passes through the suction pipe 103 from the cooling system (not shown). Flows in.

  The refrigerant sucked into the compression chamber 112 is compressed by the movement of the piston 114, and the compressed refrigerant gas flows into the cooling system.

  At this time, a part of the refrigerant gas in the middle of compression leaks from the clearance between the piston 114 and the cylinder 113, and the refrigerant gas enters the cavity 132 of the piston pin 121 and enters the low-pressure sealed container 1 from the lock pin 134. It was leaking.

Japanese Utility Model Publication No. 61-173783

  However, in the conventional configuration, the refrigerant gas leaked from the clearance between the piston 114 and the cylinder 113 flows into the cavity 132 of the piston pin 121 after the middle stage of the compression process, and the refrigerant gas that flows in flows out of the lock pin 34. However, since the passage cross-sectional area formed around the lock pin 134 is not sufficient for the refrigerant gas flowing into the cavity 132 of the piston pin 121, pressure loss resistance is generated when the refrigerant gas is discharged, and the refrigerant The gas was difficult to flow out.

  Therefore, in the conventional configuration, the refrigerant gas remaining in the cavity 132 of the piston pin 121 is blown into the sealed container 101 at a stroke when the cavity 132 of the piston pin 121 communicates with the low-pressure sealed container 101. As a result, the refrigerant gas that flows out at once becomes an excitation source, which may cause the closed container 101 to resonate and increase noise.

  The present invention solves the above-described conventional problems, and suppresses the containment of the refrigerant gas in the cavity of the piston pin, suppresses a sudden jet of the refrigerant gas, and reduces vibration and noise. For the purpose.

  In order to solve the above-described conventional problems, a hermetic compressor according to the present invention has a configuration in which an eccentric shaft portion provided on a shaft and a piston pin provided on a piston and having a hollow portion are connected via a connecting rod. The piston and the piston pin are provided with communication means for always communicating the cavity of the piston pin and the inside of the sealed container.

  Thereby, even if the refrigerant gas leaked from the compression chamber flows into the cavity of the piston pin, it can quickly flow out from the communicating means into the sealed container.

  Therefore, with the operation of the compression element, the refrigerant gas confined in the cavity of the piston pin is not injected all at once, so that the vibration and noise associated with the injection and discharge of the refrigerant gas can be reduced.

  In the hermetic compressor of the present invention, the refrigerant gas leaked from the compression chamber into the cavity of the piston pin cannot be contained in the cavity of the piston pin, so that the refrigerant gas that has flowed into the cavity of the piston pin along with the operation of the compression element Are not injected all at once, and vibration and noise associated with the injection and discharge of the refrigerant gas can be reduced, and a hermetic compression with low vibration and low noise can be achieved.

1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention. Cross-sectional view of hermetic compressor in the first embodiment The expanded sectional view of the compression element part of the hermetic compressor in Embodiment 1 Sectional drawing of the piston part of the hermetic compressor in Embodiment 2 of this invention The rear view of the piston part of the hermetic compressor in Embodiment 2 Sectional drawing of the piston part of the hermetic compressor in Embodiment 3 of this invention The rear view of the piston part of the hermetic compressor in Embodiment 3 Vertical section of a conventional hermetic compressor Cross-sectional view of a conventional hermetic compressor Main section enlarged sectional view of a conventional hermetic compressor

  According to the first aspect of the present invention, an electric element and a compression element driven by the electric element are provided in a sealed container, and the compression element has at least a main shaft portion and an eccentric shaft portion, and the electric element A shaft that is driven by the cylinder, a cylinder that forms a compression chamber, a piston that reciprocates in the compression chamber, and a connecting rod that has one end connected to the eccentric shaft portion and the other end connected to the piston. Furthermore, the piston is provided with a piston pin hole penetrating in the diametrical direction of the piston, and a cylindrical piston pin inserted into the piston pin hole and having a hollow portion, and the piston and the connecting rod are connected. The piston pin passes through an annular small end provided at the other end of the connecting rod, and the piston pin and the piston The cavity of Sutonpin is provided with a communicating means for communicating to said closed vessel.

  With this configuration, the refrigerant gas leaking from the compression chamber and flowing into the cavity of the piston pin can be discharged into the sealed container through the communication means. As a result, with the operation of the compression element, the refrigerant gas confined in the cavity of the piston pin is not injected at a stretch, and the vibration and noise associated with the injection and discharge of the refrigerant gas can be reduced.

  According to a second aspect of the present invention, in the first aspect of the present invention, the communication means includes a first through hole penetrating from the peripheral wall of the piston pin to the cavity portion, and a side wall surface of the anti-compression chamber of the piston. The second through hole is provided through the piston pin hole and communicates with the first through hole when the piston pin is mounted.

  By adopting such a configuration, the refrigerant gas that has flowed into the cavity of the piston pin is discharged from the first through hole and the second through hole toward the anti-compression chamber. The refrigerant gas flowing into the section can be discharged without forcing. As a result, the refrigerant gas discharged from the hollow portion is not compressed more than necessary or jetted out and can suppress the generation of vibration and noise. Moreover, the hole processing as a communication means becomes easy and productivity can be improved.

  According to a third aspect of the present invention, in the second aspect of the present invention, the piston and the piston pin are each provided with a pin hole extending in the same direction and coaxially with the first through hole and the second through hole. A lock pin is fitted into the pin hole.

  With this configuration, it is possible to prevent the piston pin from rotating in the piston pin hole provided in the piston. As a result, the communication state of the first through hole and the second through hole can be maintained, and a passage that always communicates the cavity of the piston pin into the sealed container can be maintained. Therefore, it is possible to stabilize the vibration and noise suppression operation.

  The invention according to claim 4 is the invention according to claim 3, wherein the diameter or shape of the second through hole provided in the piston is different from or different from the diameter of the pin hole provided in the piston. It is what.

  With this configuration, the direction of rotation of the piston can be confirmed. As a result, when inserting the piston into the compression chamber, when the directionality (fixed position angle) is required for the piston, the second through hole or the pin hole can be used as the direction confirmation means (marker) of the piston, Incorrect assembly can be prevented and the assembly workability can be improved.

  According to a fifth aspect of the present invention, in the third or fourth aspect of the present invention, the first through hole and the pin hole provided in the piston pin are formed at positions symmetrical with respect to the center of the piston pin. In addition, the first through hole and the pin hole have the same diameter.

  With this configuration, the lock pin can be inserted into the first through hole, and as a result, there is no directionality in the insertion of the piston pin into the piston pin hole, and the assembly workability can be improved.

  The invention according to claim 6 is the invention according to claim 1, wherein the communication means is provided in a piston pin hole provided in the piston and an outer peripheral edge of the piston, and extends over the piston pin hole. It is comprised from the extended notch part.

  With this configuration, the refrigerant gas flowing into the cavity of the piston pin can be discharged into the sealed container from the piston pin hole provided in the piston through the notch provided in the outer peripheral edge of the piston. it can. As a result, with the operation of the compression element, the refrigerant gas confined in the cavity of the piston pin does not inject at a stroke, so that the vibration and noise associated with the injection / outflow of the refrigerant gas can be reduced. Further, since the communication means is configured using the piston pin hole, the number of processing steps for forming the communication means can be reduced, and productivity can be increased.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a hermetic compressor according to the first embodiment of the present invention, FIG. 2 is a transverse sectional view of the hermetic compressor according to the first embodiment, and FIG. 3 is a hermetic type according to the first embodiment. It is an expanded sectional view of the compression element part of a compressor.

  1, 2, and 3, the sealed container 1 includes a discharge pipe 3 and a suction pipe 4 that are connected to a cooling system (not shown), and a lubricating oil 7 is stored in the bottom inside. Furthermore, an electric element 13 composed of the stator 9 and the rotor 11, a compression element 15 driven by the electric element 13, and a suction muffler 55 through which the refrigerant before being sucked into the compression element 15 pass are accommodated. ing.

  The compression element 15 is elastically supported in the hermetic container 1 by a plurality of coil springs 17, and includes a cylinder 21 that forms a compression chamber 19 together with a valve plate 15b in which a discharge port 15a is formed and a cylinder head 15c, and a compression chamber. 19, a reciprocatingly inserted piston 23, a shaft 31 including a main shaft portion 25 and an eccentric shaft portion 27, a bearing portion 29 that supports the eccentric shaft portion 27 side of the shaft 31, and an eccentric shaft portion 27. And a connecting rod 33 for connecting the piston 23 and a piston pin 35 for connecting the piston 23 and the connecting rod 33.

  Further, the rotor 11 is fixed to the main shaft portion 25, and the stator 9 is fixed to the cylinder 21.

  As shown in FIG. 3, the piston 23 is formed with a piston pin hole 37 penetrating in the diametrical direction on the opposite side of the compression chamber 19, and is further axially sandwiched by a connecting hole 35a into which the connecting rod 33 is inserted. A circular second through hole 39a and a circular second pin hole 39b are provided at positions where are symmetrical. The second through hole 39a and the second pin hole 39b can have the same diameter. However, in the first embodiment, the diameter of the second through hole 39a is larger than the diameter of the second pin hole 39b. It is set large.

  Further, a protrusion 43 is provided on the front end surface of the piston 23 on the compression chamber side so as to be immersed into the discharge port 15a when the piston 23 is in the vicinity of the top dead center. The protrusion 43 and the discharge port 15a are located offset from the axis of the piston 23 having a circular cross section.

  Further, on the outer periphery of the piston 23, a step portion 41 communicating with the piston pin hole 37 is formed in the vicinity of the piston pin hole 37.

  Further, the piston pin 35 is formed in a cylindrical shape by providing a hollow portion 49 that is open at both ends. Further, in a state where the piston pin 35 is assembled into a fixed position in the piston 23, the second through hole 39a and the second pin hole 39b Opposing circular first through holes 51a and circular first pin holes 51b are provided. Here, the first pin hole 51b and the second pin hole 39b are formed to have substantially the same diameter.

  The connecting rod 33 includes a large end 45 that is loosely fitted to the eccentric shaft portion 27, and a small end 47 that loosely fits to the piston pin 35 in the connection hole 35 a of the piston 23.

  The substantially cylindrical piston pin 35 is inserted into a piston pin hole 37 formed in the piston 23 and passes through the small end portion 47 of the connecting rod 33. In this state, the rod-like lock pin 53 is press-fitted into the first pin hole 51b and the second pin hole 39b, whereby the piston 23, the piston pin 35, and the connecting rod 33 are connected and disconnected. The lock pin 53 is provided with a minute groove 53a extending in the axial direction, and communicates with the cavity 49 of the piston pin 35 and the inside of the sealed container 1. The lock pin 53 is not limited to a rod shape, and may be a spring pin of an appropriate shape having a known configuration.

  The operation and action of the hermetic compressor configured as described above will be described below. Here, in the first embodiment, the refrigerant used in the hermetic compressor is a natural refrigerant having a low global warming coefficient. As an example, R600a which is a hydrocarbon refrigerant is used.

  When the electric element 13 is energized, the rotor 11 rotates and the shaft 31 is driven to rotate. At this time, the connecting rod 33 converts the eccentric rotational motion of the eccentric shaft portion 27 into a reciprocating motion, whereby the piston 23 reciprocates in the compression chamber 19.

  As the piston 23 reciprocates, the refrigerant in the sealed container 1 is sucked into the compression chamber 19 from the suction muffler 55, and the refrigerant from the cooling system flows into the sealed container 1 through the suction pipe 4.

  The refrigerant sucked into the compression chamber 19 is compressed by the movement of the piston 23, discharged from the discharge port 15a, and then discharged from the discharge pipe 3 to the cooling system.

  Here, along with the compression operation of the piston 23, the protrusion 43 provided on the piston 23 immerses into the discharge port 15a when the piston 23 reaches the vicinity of the top dead center, and reduces the internal volume of the discharge port 15a. It acts to reduce the refrigerant gas remaining in the discharge port 15a and increase the efficiency of the hermetic compressor.

  In the refrigerant suction, compression, and discharge operations described above, in the compression element 15, part of the compressed refrigerant leaks from the clearance between the piston 23 and the cylinder 21 after the middle stage of the compression stroke, and the refrigerant gas flows to the outer periphery of the piston 23. Flows into the cavity 49 of the piston pin 35 from the stepped portion 41 provided on the piston pin 35.

  A part of the refrigerant gas flowing into the cavity 49 tries to flow into the low-pressure sealed container 1 from the recessed groove 53a provided in the lock pin 53, but the recessed groove 53a has a small passage cross-sectional area of the refrigerant gas. Therefore, the refrigerant gas is not configured to be discharged smoothly and in large quantities.

  However, in the first embodiment, the first through hole 51a is provided in the piston pin 35 separately from the first pin hole 51b and the second pin hole 39b in which the lock pin 53 is fitted, and the piston 23 is provided with the first pin hole 51b. Since the second through hole 39a that communicates with the one through hole 51a is provided, the refrigerant gas that has flowed into the cavity 49 passes through the first through hole 51a and the second through hole 39a as shown by the arrows in FIG. It can flow out smoothly into the sealed container 1.

  Therefore, even if the refrigerant gas leaked into the cavity 49 of the piston pin 35 flows in the middle of the compression stroke, the refrigerant gas is not contained in the cavity 49 of the piston pin 35 and always flows out into the sealed container 1. can do.

  As a result, the refrigerant gas is confined in the cavity 132 of the piston pin 121 as in the prior art, and is not ejected at the moment when the cavity 132 of the piston pin 121 communicates with the inside of the sealed container 101.

  Therefore, it is possible to suppress the occurrence of vibration associated with the ejection of the refrigerant gas, suppress the resonance of the hermetic container 1, and configure a hermetic compressor with low vibration and low noise.

  Further, since the step portion 41 provided on the outer periphery of the piston 23 does not come into contact with the cylinder 21, the sliding area between the piston 23 and the cylinder 21 can be reduced and the sliding loss can be reduced. In addition, the step portion 41 is a factor that easily accumulates the refrigerant gas leaked into the cavity portion 49 of the piston pin 35 after the middle stage of the compression process, and causes an increase in noise. Since the refrigerant gas flow path between the cavity 49 of the piston pin 35 and the inside of the sealed container 1 is sufficiently secured by the 51a and the second through hole 39a, the refrigerant is also provided in the step portion 41 in addition to the cavity 49 of the piston pin 35. The refrigerant gas always flows out into the sealed container 1 without accumulating gas.

  Therefore, in spite of the provision of the step portion 41, it is possible to reduce the work amount of the hermetic compressor and to suppress the vibration associated with the refrigerant gas outflow.

  Further, in the first embodiment, since the protrusion 43 is provided on the front end surface of the piston 23 on the compression chamber 19 side, the direction in which the piston 23 is inserted into the cylinder 21 is inevitably determined. When the direction is set, the projection 43 collides with the valve plate 15b or the like and is damaged.

  In order to prevent this, in the first embodiment, the diameter of the second through hole 39a provided in the piston 23 is set larger than the diameter of the second pin hole 39b.

  Therefore, when the direction of the piston 23 is rotated 180 ° in the rotational direction and is erroneously inserted into the cylinder 21, the second through hole 39a is positioned upward in FIG. When trying to press-fit through the through-hole 39a, play with the lock pin 53 is large, and it is possible to effectively urge the operator to be alerted, and to suppress quality defects associated with incorrect assembly.

  As a measure for preventing such erroneous assembly, it is possible to make the shape of the hole different from the shape of the second pin hole 39b, such as making the second through hole 39a a square hole. I can expect.

  In addition, the second through hole 39a formed in the piston 23 and the first through hole 51b formed in the piston pin 35 are circular. However, in the case of a compressed gas flow path having the same cross-sectional area, the circular one is larger than the polygon. However, the pressure loss resistance can be reduced, the compressed gas can be discharged into the sealed container 1 more smoothly, and the workability is also good.

  In addition, since the density of the R600a refrigerant is smaller than that of the R134a refrigerant conventionally used in refrigerators or the like, it is necessary to increase the cylinder volume of the cylinder 21 in order to obtain the same refrigeration capacity as the compressor of the R134a refrigerant. To do.

  As a result, the piston 23 has an increased outer diameter, and the entire length of the piston pin 35 is increased accordingly. Accordingly, the volume of the cavity 49 of the piston pin 35 is also increased, and the volume for containing the refrigerant gas is increased. In the first embodiment, the first through hole 51a in which the lock pin 53 is not inserted and the first through hole 51a are inserted. The refrigerant gas in the cavity 49 can always flow out into the sealed container 1 by the two through holes 39a.

  When the piston pin 35 is installed upside down, the first through hole 51a becomes the first pin hole 51b and the first pin hole 51b becomes the first through hole 51a. Even if the refrigerant gas flows into the hollow portion 49, it can be smoothly discharged into the sealed container 1 without being contained.

(Embodiment 2)
FIG. 4 is a cross-sectional view of the piston portion of the hermetic compressor according to the second embodiment of the present invention. FIG. 5 is a rear view of the piston of the hermetic compressor according to the second embodiment when viewed from the side opposite to the compression chamber. Since the overall configuration of the hermetic compressor is the same as that of the first embodiment, the description thereof will be omitted, and here, the configuration and operational effects different from those of the first embodiment will be described. Further, the same constituent elements as those of the first embodiment will be described with the same reference numerals.

  In the first embodiment, the refrigerant gas confined in the cavity 49 of the piston pin 35 is allowed to flow out, and the piston is located at a position where the axis is symmetric with respect to the connecting hole 35a into which the connecting rod 33 is inserted. 23 is provided with a second through hole 39a and a second pin hole 39b, and the piston pin 35 is further provided with a first through hole 51a and a first pin hole 51b. As shown in FIGS. 4 and 5, the piston 23 is provided with one through hole 59, and the piston pin 35 is provided with a pin hole 60 at a position where the axial center is symmetric with respect to the coupling hole 35a. It is configured.

  Further, the through hole 59 and the pin hole 60 are formed in a daruma shape in which the small circle portions 59a and 60a and the large circle portions 59b and 60b are overlapped, respectively, and the small circle portions 59a and 60a have the same diameter, The large circular portions 59b and 60b are also formed with the same diameter.

  In the assembled state of the piston 23, the connecting rod 33, and the piston pin 35, the lock pin 53 is press-fitted into the small circle portions 59a and 60a, and the large circle portions 59b and 60b are in communication with each other. Further, one of the pin holes 60 provided in the piston pin 35 is closed by the inner wall of the piston pin hole 37.

  In the above configuration, the piston 23 is inserted into the cylinder 21 and constitutes the compression element 15.

  In the compression stroke, a part of the compressed refrigerant gas leaks from the clearance between the piston 23 and the cylinder 21 and flows into the cavity 49 of the piston pin 35. The refrigerant gas that has flowed into the cavity 49 is shown in FIG. As indicated by the arrows, the gas flows out of the through holes 59 and the large circular portions 59b and 60b of the pin hole 60 into the sealed container 1.

  Therefore, as in the first embodiment, the refrigerant gas can always flow out into the sealed container 1 without confining the refrigerant gas in the cavity 49 of the piston pin 35, and the vibration accompanying the ejection of the refrigerant gas Can be suppressed, the resonance of the sealed container 1 can be suppressed, and a hermetic compressor with low vibration and low noise can be configured.

  Further, since the piston pin 35 can be incorporated upside down, it is not necessary to keep in mind the direction. Further, the piston 23 has a single through hole 59 so that the direction of the piston 23 is known. It becomes a mark, and it can also be suppressed that it is incorporated in a state where it is rotated 180 ° during insertion into the cylinder 21 (a state in which the top and bottom are reversed in FIG. 4). Therefore, the assembly quality can be stabilized.

(Embodiment 3)
FIG. 6 is a cross-sectional view of the piston portion of the hermetic compressor according to the second embodiment of the present invention. FIG. 7 is a rear view of the piston of the hermetic compressor according to the second embodiment as viewed from the side opposite to the compression chamber. Since the overall configuration of the hermetic compressor is the same as that of the first embodiment, the description thereof is omitted, and here, the configuration and the operational effects different from those of the first and second embodiments will be described. Further, the same constituent elements as those of the first embodiment will be described with the same reference numerals.

  In the first and second embodiments, the configuration in which the first through-hole 51a and the second through-hole 39a are in communication with each other, or the through-hole 59 is used as the configuration for allowing the refrigerant gas confined in the cavity 49 of the piston pin 35 to flow out. In the third embodiment, the chamfered portions 71 formed at both ends of the piston pin hole 37 are used as shown in FIGS. 6 and 7. , And a notch 72 provided on the outer peripheral edge of the piston 23 is formed across the chamfered portion 71 of the piston pin hole 37.

  In the above configuration, the piston 23 is inserted into the cylinder 21 and constitutes the compression element 15.

  In the compression stroke, part of the compressed refrigerant gas leaks from the clearance between the piston 23 and the cylinder 21 and flows into the cavity 49 of the piston pin 35, but the chamfered portion 71 of the piston pin hole 37 passes through the notch 72. Since the refrigerant gas that has flowed into the cavity 49 passes through the chamfered portion 71 and the cutout portion 72 as shown by the arrows in FIG. Spill to

Therefore, as in the first and second embodiments, the refrigerant gas can always flow out into the sealed container 1 without confining the refrigerant gas in the cavity 49 of the piston pin 35, and the refrigerant gas is ejected. Generation of vibration can be suppressed, resonance of the sealed container 1 can be suppressed, and a hermetic compressor with low vibration and low noise can be configured.

  Also, since the piston pin 35 can be incorporated upside down, it is not necessary to keep in mind the direction, and the piston 23 is also oriented in the direction of the piston 23 because the notch 72 is one place. It becomes a mark to know, and it is also possible to suppress the incorporation in a state where it is rotated 180 ° in the insertion into the cylinder 21 (a state in which the top and bottom are reversed in FIG. 6). Therefore, the assembly quality can be stabilized.

  As described above, the hermetic compressor according to the present invention provides a hermetic compressor that does not contain refrigerant gas in the cavity of the piston pin. In addition to a home air conditioner and a home refrigerator / freezer, In addition, it can also be applied to commercial refrigeration cycle systems such as vending machines.

DESCRIPTION OF SYMBOLS 1 Airtight container 13 Electric element 15 Compression element 19 Compression chamber 21 Cylinder 23 Piston 31 Shaft 33 Connecting rod 35 Piston pin 37 Piston pin hole 39a Second through hole 39b Second pin hole 47 Small end part 49 Cavity part 51a First through hole 51b First pin hole 53 Lock pin 59 Through hole 60 Pin hole 71 Chamfered portion 72 Notch

Claims (6)

An electric element and a compression element driven by the electric element are provided in the sealed container, and the compression element includes at least a main shaft portion and an eccentric shaft portion, and a shaft driven by the electric element, and a compression chamber And a piston that reciprocates in the compression chamber, a connecting rod having one end connected to the eccentric shaft portion and the other end connected to the piston, and the piston includes the piston. A piston pin hole penetrating in the diametrical direction, a cylindrical piston pin inserted into the piston pin hole and having a hollow portion, and a connecting configuration of the piston and the connecting rod is provided at the other end of the connecting rod. The piston pin is configured to pass through a small annular end, and the piston pin cavity is provided in front of the piston pin and the piston. Hermetic compressor provided with a communicating means for communicating with the closed vessel. The communication means is provided through the first through hole penetrating from the peripheral wall of the piston pin to the cavity, and through the piston pin hole from the side wall surface of the anti-compression chamber of the piston, and when the piston pin is mounted The hermetic compressor according to claim 1, wherein the hermetic compressor is configured by a second through hole communicating with the first through hole. The pin and the piston pin are provided with pin holes extending in the same direction and in the same direction as the first through hole and the second through hole, respectively, and a lock pin is fitted in the pin hole. Hermetic compressor. The hermetic compressor according to claim 3, wherein the diameter or shape of the second through hole provided in the piston is different from or different from the diameter of the pin hole provided in the piston. The first through hole and the pin hole provided in the piston pin are formed at positions symmetrical with respect to the center of the piston pin, and the first through hole and the pin hole have the same diameter. 4. The hermetic compressor according to 4. 2. The hermetic compressor according to claim 1, wherein the communication means includes a piston pin hole provided in the piston and a notch provided on an outer peripheral edge of the piston and extending over the piston pin hole. .