JP2013057285A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent wear generated in a thrust surface or a thrust washer in a compressor including the thrust washer between the thrust surface and a rotator, where the wear is generated because a cooling gas sucked along with lubricant is remained in a thrust part, sufficient lubricant is not supplied to a thrust sliding part.SOLUTION: The hermetic compressor includes: the thrust surface 184; a thrust surface groove 162 communicating the inside of a bearing 126 with the outside of the bearing 126 through the thrust surface 184; the thrust washer 164 provided between a bearing end surface and the rotator 154; and a notch 166 in the inner circumference of the thrust washer 164. Accordingly, the sufficient lubricant supplied to the thrust sliding part suppresses the wear generated in the thrust surface 184 or the thrust washer 164, thus preventing an increase of input.

Description

  The present invention relates to a hermetic compressor used in a refrigerator-freezer or the like.

  In recent years, high efficiency and high reliability for reducing power consumption are desired for compressors used in refrigeration apparatuses such as refrigerators and refrigerators.

  Conventionally, this type of compressor employs a thrust washer for the purpose of improving efficiency and increasing reliability, and has a structure in which a shaft can freely rotate with respect to a bearing (for example, see Patent Document 1).

  The conventional compressor will be described below with reference to the drawings.

  4 is a longitudinal sectional view of a conventional compressor, FIG. 5 is an enlarged view of a main part of the conventional compressor, FIG. 6 is a diagram of a thrust washer of the conventional compressor, and FIG. 7 is another conventional compressor. FIG. 8 is an enlarged view of a main part of the conventional compressor, and FIG. 9 is a view of a thrust washer viewed from a thrust sliding surface of the conventional compressor.

  4, 5, and 6, the hermetic container 1 stores an electric element 2 including a stator 52 and a rotor 54, and a compression element 4 that is rotationally driven by the electric element 2. The lubricating oil 6 is stored. The electric element 2 and the compression element 4 are assembled together to form a compression mechanism 8, and the compression mechanism 8 is elastically supported in the sealed container 1 by a plurality of coil springs (not shown).

  A cylindrical compression chamber 22 is formed in the cylinder block 20 constituting the compression element 4, and a piston 24 is reciprocally inserted into the compression chamber 22. A bearing 26 is fixed to the upper part of the cylinder block 20, a thrust surface 28 is formed on the bearing end surface of the bearing 26, and a thrust surface groove 60 that communicates the inside of the bearing with the outside of the bearing is formed on the thrust surface 28. Has been. A thrust washer 62 is disposed between the thrust surface 28 and the rotor 54.

  The shaft 30 includes a main shaft portion 34 that is pivotally supported by the bearing 26 in the vertical direction and has a spiral oil supply groove 32 on the outer periphery, and an eccentric shaft portion 36 formed below the main shaft portion 34. 36 and the piston 24 are connected by a connecting mechanism 44.

  Further, a pipe-shaped oil supply pipe 42 is press-fitted into an oil supply hole (not shown) formed at the lower end of the eccentric shaft portion 36, and one end of the oil supply pipe 42 communicates with the spiral oil supply groove 32 from the oil supply hole. ing.

  The electric element 2 includes a stator 52 fixed above the cylinder block 20 and a rotor 54 fixed to the main shaft portion 34 of the shaft 30 by shrink fitting or the like.

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

  When the electric element 2 is energized from an external power source, the rotor 54 rotates and the shaft 30 rotates accordingly. Along with the rotation of the shaft 30, the rotation (turning) motion of the eccentric shaft portion 36 is transmitted to the piston 24 through the coupling mechanism 44, and the piston 24 reciprocates in the compression chamber 22, and the compression element 4 is predetermined. Perform the compression operation.

  By this operation, the refrigerant gas is sucked into the compression chamber 22 from the cooling system (not shown), compressed, and then discharged again to the cooling system.

  At this time, the oil supply pipe 42 draws up the lubricating oil 6 by centrifugal force, lubricates each sliding portion (not shown), and is guided from the helical oil supply groove 32 to the outer periphery of the bearing 26 through the thrust surface groove 60. . At that time, a part of the lubricating oil 6 is supplied to the thrust surface 28 and the thrust washer 62, lubricates the thrust sliding portion, prevents wear of the thrust surface 28 and the thrust washer 62, and ensures reliability.

  In another conventional compressor, as shown in FIGS. 7, 8, and 9, the thrust washer 64 is provided on the thrust sliding surface of the thrust washer 64 without providing the thrust surface groove 60 on the thrust surface 28. A groove 66 that communicates the inner periphery with the outer periphery of the thrust washer 64 is provided, and the lubricating oil 6 is supplied to the thrust sliding portion to obtain the same effect.

Japanese Patent Laid-Open No. 62-247187

  However, in the above conventional configuration, the refrigerant gas pumped together with the lubricating oil 6 from the oil supply pipe 42 stays in the thrust portion, and the lubricating oil 6 is not sufficiently supplied to the thrust sliding portion, so that the thrust surface 28 and the thrust washer 62 are There was a possibility that it was worn and reliability was lowered. Further, in order to cool the compression element 4, the amount of the lubricating oil 6 discharged from the thrust surface groove 60 must be increased. For this reason, if the flow path area of the thrust surface groove 60 is increased, the lubricating oil 6 flows through the bottom without filling the thrust surface groove 60, so that the lubricating oil 6 may not be sufficiently supplied to the thrust sliding portion. .

  On the other hand, when the groove 66 is provided as in the thrust washer 64, it is difficult to secure a large amount of lubricating oil discharge, and gas is entrained in the thrust sliding portion together with the lubricating oil 6 so that the thrust sliding portion There is a possibility that the lubricating oil 6 is not sufficiently supplied, and the thrust surface 28 and the thrust washer 64 are worn and reliability is lowered.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a highly efficient and highly reliable compressor that suppresses the occurrence of wear on the thrust surface and thrust washer of a bearing and suppresses an increase in input. And

  In order to solve the above-described conventional problems, a compressor according to the present invention includes a thrust surface groove that communicates the inside of the bearing with the outside of the bearing on the surface of the bearing end surface, a thrust surface provided on the bearing end surface, and a bearing with the thrust surface. A thrust surface groove that communicates the inside with the outside of the bearing, a thrust washer provided between the bearing end surface and the rotor, and a notch on the inner peripheral side of the thrust washer.

  As a result, sufficient lubricating oil can be supplied to the thrust sliding portion, so that the occurrence of wear on the thrust surface and the thrust washer of the bearing can be suppressed, and an increase in input can be suppressed.

The compressor of the present invention is a thrust washer provided between a bearing end face and a rotor, and a notch portion is provided on the inner peripheral side of the thrust washer, and generation of wear on the thrust surface of the bearing and the thrust washer. Therefore, it is possible to provide a highly efficient and highly reliable compressor that suppresses the increase in input.

1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention. The principal part enlarged view of the hermetic compressor in Embodiment 1 of this invention The figure of the thrust washer seen from the anti-thrust sliding surface of the hermetic compressor in Embodiment 1 of the present invention Vertical section of a conventional compressor Enlarged view of the main parts of a conventional compressor Figure of thrust washer of conventional compressor Vertical section of another conventional compressor Main part enlarged view of another conventional compressor Figure of thrust washer seen from the thrust sliding surface of another conventional compressor

  According to the first aspect of the present invention, there is provided an electric element having a stator and a rotor in a sealed container in which lubricating oil is stored, and a compression element disposed below the electric element and driven by the electric element. And the compression element includes a shaft having a main shaft portion to which an eccentric shaft portion and the rotor are fixed, a cylinder block having a compression chamber, a piston reciprocating in the compression chamber, and the piston A coupling mechanism that couples the eccentric shaft portion, a bearing that is provided in the cylinder block and supports the main shaft portion of the shaft, a thrust surface that is provided on the bearing end surface, and the thrust surface A thrust surface groove that communicates between the inside of the bearing and the outside of the bearing, and a thrust washer provided between the bearing end surface and the rotor, and the inner peripheral side of the thrust washer It is provided with a cutout portion.

  By adopting such a configuration, the refrigerant gas pumped up together with the lubricating oil from the oil supply pipe is discharged from the notch in the upper part of the thrust part, and the lubricating oil lubricates the thrust sliding part while flowing through the thrust surface groove. Can do. As a result, it is possible to suppress the occurrence of wear on the thrust surface of the bearing and the thrust washer, suppress an increase in input, and provide a highly efficient and highly reliable compressor.

  The invention according to claim 2 is the washer according to claim 1, wherein the notch portion of the thrust washer and the outer peripheral portion of the thrust washer communicate with the surface of the anti-thrust sliding surface of the thrust washer. A surface groove is provided.

  Thus, in addition to the refrigerant gas discharged from the notch portion at the top of the thrust portion, lubricating oil that cannot be discharged from the thrust surface groove can be discharged from the washer surface groove. As a result, a cooling effect due to an increase in the amount of lubricating oil can be obtained, the lubrication state of each sliding portion including the thrust sliding portion can be improved, and high reliability can be obtained.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a circumferential groove is provided inside the bearing end surface.

  Accordingly, the lubricating oil can be stored in the thrust portion, and the lubricating oil and the refrigerant gas can be easily separated. As a result, it is possible to prevent the refrigerant gas from being caught in the thrust sliding portion and to obtain higher reliability.

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 an enlarged view of a main part of the hermetic compressor according to the first embodiment, and FIG. It is the figure of the thrust washer seen from the anti-thrust sliding surface of the hermetic type compressor.

  1 to 3, an electric element 102 including a stator 152 and a rotor 154 and a compression element 104 that is rotationally driven by the electric element 102 are accommodated in a sealed container 101, and a lubricating oil is provided at the bottom. 106 is stored. The electric element 102 and the compression element 104 are assembled together to form a compression mechanism 108, and the compression mechanism 108 is elastically supported in the sealed container 101 by a plurality of coil springs (not shown).

  A cylindrical compression chamber 122 is formed in the cylinder block 120 constituting the compression element 104, and a piston 124 is fitted into the compression chamber 122 so as to reciprocate. A bearing 126 is fixed to the upper part of the cylinder block 120, a thrust end surface 184 is formed on the bearing end surface 180 above the bearing 126, and a circumferential groove 160 is formed on the inner side. As an example of the circumferential groove 160, a configuration similar to chamfering can be assumed, but a machining shape that takes into account the amount of the lubricating oil 106 stored therein is required.

  The thrust surface 184 is provided with a thrust surface groove 162 that communicates the inside of the bearing 126 with the outside of the bearing 126.

  A thrust washer 164 is disposed between the thrust surface 184 and the rotor 154 so as to be slidable with the thrust surface 184. The thrust washer 164 is provided with a notch 166 on the inner peripheral side, and a washer surface groove 168 that connects the notch 166 and the outer periphery of the thrust washer 164 is formed on the anti-thrust sliding surface. .

  The shaft 130 includes a main shaft portion 134 that is pivotally supported by the bearing 126 in the vertical direction and has a spiral oil supply groove 132 on the outer periphery, and an eccentric shaft portion 136 formed below the main shaft portion 134. The eccentric shaft portion 136 and the piston 124 are connected by a connecting mechanism 144.

  An oil supply pipe 142 is press-fitted into an oil supply hole (not shown) formed at the lower end of the eccentric shaft portion 136. The oil supply pipe 142 communicates with the spiral oil supply groove 132 through an oil supply hole.

  Further, the rotor 154 is fixed to the main shaft portion 134 of the shaft 130 by shrink fitting or the like.

  About the compressor comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  When the electric element 102 is energized from an external power source (not shown), the rotor 154 rotates and the shaft 130 rotates accordingly. Along with the rotation of the shaft 130, the rotational (turning) motion of the eccentric shaft portion 136 is converted into a reciprocating motion by the connecting mechanism 144 and transmitted to the piston 124, so that the piston 124 reciprocates within the compression chamber 122. The compression element 104 performs a predetermined compression operation.

  As a result, the refrigerant gas is sucked into the compression chamber 122 from a cooling system (not shown), compressed here, and then discharged to the cooling system again.

  The lubricating oil 106 stored at the bottom of the sealed container 101 is agitated by an oil supply pipe 142 that rotates as the shaft 130 rotates. Thereby, the lubricating oil 106 includes bubbles of the refrigerant gas.

  The lubricating oil 106 containing bubbles of the refrigerant gas is pumped up from the oil supply pipe 142 by a centrifugal pump, lubricates each sliding portion such as the eccentric shaft portion 136, and a part of the lubricating oil 106 is formed in a spiral shape. It is guided from the oil supply groove 132 to the circumferential groove 160. The lubricating oil 106 guided to the circumferential groove 160 is pushed in the outer peripheral direction of the bearing end surface 180 by the centrifugal force accompanying the rotation of the oil supply groove 132, and is discharged from the thrust surface groove 162 to the outside of the bearing 126. At this time, part of the lubricating oil 106 lubricates the thrust sliding portion of the thrust surface 184 and the thrust washer 164.

  On the other hand, the bubbles of the refrigerant gas pumped together with the lubricating oil 106 into the circumferential groove 160 are separated above the lubricating oil 106 accumulated in the circumferential groove 160, pass through the notch 166 of the thrust washer 164, and the surface of the thrust washer It is discharged from the groove 168.

  Thereby, the refrigerant gas is prevented from being caught in the thrust sliding portion, and the lubricating oil 106 can be supplied to the thrust sliding portion. As a result, the occurrence of wear on the thrust surface 184 and the thrust washer 164 of the bearing 126 can be suppressed, and high reliability can be obtained.

  Furthermore, since the lubrication state of the thrust sliding portion can be improved, an increase in the input of the thrust sliding portion can be suppressed, and high efficiency can be obtained.

  Further, when the temperature of the compression element 104 increases due to the operation of the compressor, the viscosity of the lubricating oil 106 decreases, and the amount of the lubricating oil 106 pumped up from the oil supply groove 132 increases, the lubricating oil 106 from the thrust surface groove 162 increases. It becomes a condition that makes it difficult to discharge.

  Even in such a situation, the configuration of the first embodiment can discharge the lubricating oil 106 together with the refrigerant gas from the washer surface groove 168 through the notch 166 of the thrust washer 164. For this reason, the amount of the lubricating oil 106 flowing through the shaft 130 can be increased, and the temperature rise of the compression element 104 can be suppressed.

  Thereby, the viscosity fall of the lubricating oil 106 of the sliding part resulting from the temperature rise of the compression element 104 can be reduced, generation | occurrence | production of abrasion of a sliding part can be suppressed, and high reliability can be acquired.

  Further, by suppressing the temperature rise of the compression element 104, the refrigerant gas returned from the cooling system can be sucked into the compression chamber 122 without increasing the temperature and the refrigeration capacity can be improved, so that high efficiency can be obtained. .

  In the first embodiment, the compressor having the structure in which the compression element 104 is disposed below the electric element 102 has been described as an example. However, the compression element 104 is disposed above the electric element 102. It can be easily understood by those skilled in the art that even in a compressor having the above structure, this structure can be adopted in the bearing portion to which a thrust load similarly acts, and the same effect can be obtained.

  As described above, the compressor according to the present invention includes the thrust washer provided between the receiving end surface and the rotor, and the notch portion provided on the inner peripheral side of the thrust washer. Since it is possible to provide a highly efficient and highly reliable compressor that suppresses the occurrence of wear in the thrust washer and suppresses an increase in input, it can be applied to applications such as vending machines, refrigeration showcases, and dehumidifiers.

DESCRIPTION OF SYMBOLS 101 Airtight container 102 Electric element 104 Compression element 106 Lubricating oil 120 Cylinder block 122 Compression chamber 124 Piston 126 Bearing 130 Shaft 134 Main shaft part 136 Eccentric shaft part 144 Connection mechanism 152 Stator 154 Rotor 160 Circumferential groove 162 Thrust surface groove 164 Thrust washer 166 Notch 168 Thrust washer surface groove 184 Thrust surface

Claims (3)

In an airtight container storing lubricating oil, an electric element including a stator and a rotor, and a compression element disposed below the electric element and driven by the electric element are accommodated, and the compression element is A shaft having an eccentric shaft portion and a main shaft portion to which the rotor is fixed, a cylinder block having a compression chamber, a piston reciprocating in the compression chamber, and the piston and the eccentric shaft portion are connected. A coupling mechanism; a bearing provided on the cylinder block and supporting the main shaft portion of the shaft; a thrust surface provided on the bearing end surface; and the inside of the bearing and the outside of the bearing communicate with each other on the thrust surface. Sealing structure including a thrust surface groove, a thrust washer provided between the bearing end surface and the rotor, and a notch provided on the inner peripheral side of the thrust washer Compressor. 2. The hermetic compressor according to claim 1, wherein a washer surface groove that communicates a notch portion of the thrust washer and an outer peripheral portion of the thrust washer is provided on a surface of the anti-thrust sliding surface of the thrust washer. The hermetic compressor according to claim 1, wherein a circumferential groove is provided inside the bearing end surface.