JP2014080945A - Hermetic type compressor and refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic type compressor which uses a thrust ball bearing, makes a lower race into an elastic form to eliminate a support member and reduce a number of components for the thrust ball bearing, and thereby achieves high productivity.SOLUTION: A thrust ball bearing 276 includes: multiple balls 266 held by a holder part 268; and an upper race 264 and a lower race 270 which are respectively disposed above and below the balls 266. The lower race 270 is made into an elastic form that allows inclination of the upper race 264. The form of the lower race eliminates a support member disposed below a conventional thrust ball bearing 276 thereby reducing the number of components of the thrust ball bearing 276 and improving the productivity.

Description

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

  In recent years, with regard to hermetic compressors used in electric refrigerator-freezers, high efficiency for reducing power consumption, low noise, and high reliability are desired.

  Conventionally, this type of hermetic compressor employs a rolling bearing as a thrust bearing to improve efficiency (for example, see Patent Document 1).

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

  FIG. 13 is a longitudinal sectional view of a conventional hermetic compressor described in Patent Document 1, FIG. 14 is an enlarged view of a main part of a conventional thrust ball bearing, and FIG. 15 is a perspective view of a support member.

  In FIG. 12, lubricating oil 4 is stored at the bottom of the sealed container 2, and the compressor body 6 is elastically supported by the suspension container 8 with respect to the sealed container 2.

  The compressor body 6 includes an electric element 10 and a compression element 12 disposed above the electric element 10. The electric element 10 includes a stator 14 and a rotor 16.

  The shaft 18 of the compression element 12 includes a main shaft portion 20 and an eccentric shaft portion 22. The main shaft portion 20 is rotatably supported by a main bearing 26 of the cylinder block 24 and the rotor 16 is fixed. . And it has the structure of the cantilever bearing which supports the main axis | shaft part 20 arrange | positioned only in the lower side of the eccentric shaft part 22 with the main bearing 26 with respect to the eccentric shaft part 22 to which a load acts.

  The shaft 18 includes an oil supply mechanism 29 including a spiral groove 28 provided on the surface of the main shaft portion 20.

  The piston 30 is reciprocally inserted into a cylinder 34 having a substantially cylindrical inner surface formed in the cylinder block 24. Further, the coupling means 36 couples the eccentric shaft portion 22 and the piston 30 by fitting the hole portions provided at both ends into the piston pin 38 and the eccentric shaft portion 22 attached to the piston 30, respectively.

  The cylinder 34 and the piston 30 form a compression chamber 48 together with the valve plate 46 attached to the opening end surface of the cylinder 34. Further, the cylinder head 50 is fixed so as to cover the valve plate 46 and cover it.

  The suction muffler 52 is molded from a resin such as PBT, forms a sound deadening space inside, and is held between the valve plate 46 and the cylinder head 50.

  Next, the thrust ball bearing will be described.

  In FIG. 14, the main bearing 26 has a thrust surface 60 that is a flat portion perpendicular to the shaft center, and a tubular extension 62 that extends further upward than the thrust surface 60 and has an inner surface facing the main shaft portion 20. ing.

  On the outer diameter side of the tubular extension 62, an upper race 64, a ball 66 held by a holder 68, a lower race 70, and a support member 72 are sequentially disposed on the thrust surface 60, and a thrust ball bearing 76 is provided. It is configured.

  The upper race 64 and the lower race 70 are annular and metal flat plates, and the upper and lower surfaces are parallel. The holder portion 68 has an annular shape, and accommodates the balls 66 in a plurality of holes provided in the circumferential direction so as to be freely rollable.

  As shown in FIG. 15, the support member 72 is an annular metal plate provided with lower projections 72 a and 72 b and upper projections 72 c and 72 d. These protrusions are formed with curved surfaces having the same radius, and are arranged such that a line connecting the vertices of the lower protrusions 72a and 72b and a line connecting the vertices of the upper protrusions 72c and 72d are at right angles. The protrusions 72a and 72b are in contact with the thrust surface 60 in a line contact state, and the upper protrusions 72c and 72d are in contact with the lower race 70 in a line contact state. A flange portion 74 of the shaft 18 is seated on the upper surface of the upper race 64.

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

  When the electric element 10 is energized, the rotor 16 rotates together with the main shaft portion 20 by the rotating magnetic field generated in the stator 14. Due to the rotation of the main shaft portion 20, the eccentric shaft portion 22 moves eccentrically, and the eccentric movement of the eccentric shaft portion 22 is transmitted to the piston 30 via the connecting means 36, and the piston 30 reciprocates within the cylinder 34.

  The refrigerant returned from the refrigeration cycle (not shown) outside the hermetic container 2 is introduced into the compression chamber 48 via the suction muffler 52, and is compressed by the piston 30 in the compression chamber 48, and the compressed refrigerant is sealed. It is sent to a refrigeration cycle (not shown) outside the container 2.

  The lower end of the shaft 18 is immersed in the lubricating oil 4, and when the shaft 18 rotates, the lubricating oil 4 is supplied to each part of the compression element 12 by the oil supply mechanism 28 and lubricates the sliding portion.

  Next, the thrust ball bearing 76 will be described.

  The thrust ball bearing 76 is a rolling bearing in which the ball 66 rolls in a point contact with the upper race 64 and the lower race 70 and can rotate while supporting a vertical load such as the weight of the shaft 18 and the rotor 16. is there. Rolling bearings have less friction than commonly used thrust bearings in the form of sliding bearings, and in recent years, they have been increasingly used to increase efficiency.

  The holder portion 68 is positioned at the inner diameter portion by the outer diameter surface of the tubular extension portion 62, and the ball 66 rolls on the upper surfaces of the upper race 64 and the lower race 70 on a certain radius. Since both the upper race 64 and the lower race 70 are flat, there is no function of regulating the horizontal position, so that even if the horizontal positions of the upper race 64 and the lower race 70 are slightly shifted, extra force is generated in the horizontal direction. There is nothing.

  Further, in the configuration of the cantilever bearing, the shaft 18 can be avoided from being slightly inclined in the range of the gap between the main shaft portion 20 and the main bearing 26 due to a load generated when the piston 30 compresses the refrigerant in the compression chamber 48. Absent. However, the centering function of the support member 72 maintains the upper race 64 and the lower race 70 in a parallel state, equalizing the load acting on each ball 66 and preventing the life of the thrust ball bearing 76 from being reduced. Yes.

  Further, by providing elasticity to the support member 72, circular dents caused by the balls 66 are caused on the rolling surfaces of the upper race 64 and the lower race 70 where the ball 66 of the thrust ball bearing rolls due to an impact such as a drop during transportation. Prevents it from occurring.

JP 2005-500476 Gazette

  However, in the above conventional configuration, since a support member is added in addition to the ball, the holder portion, the upper race, and the lower race necessary for reducing the friction that is the original function of the thrust ball bearing, the thrust ball bearing There has been a problem that the number of parts increases and productivity decreases. The present invention solves the above-mentioned problem, and supports the lower race by providing the lower race with an alignment function for maintaining the upper race and the lower race of the support member in a parallel state and an elastic function for absorbing an impact during a fall or the like. An object of the present invention is to provide a hermetic compressor with high productivity by reducing the number of parts of the thrust ball bearing by omitting members.

  In order to solve the above-mentioned conventional problems, the hermetic compressor of the present invention is such that the lower race of the thrust ball bearing has an elastic shape, the shaft is slightly inclined, and the upper race is inclined following the shaft. However, the shape of the lower race can absorb the difference in height between the balls due to the inclination of the upper race, and can also absorb the impact when dropped.

  In the hermetic compressor of the present invention, the support member can be omitted by providing the lower race with the function of the support member. Therefore, the number of parts of the thrust ball bearing can be reduced and the productivity can be improved.

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 thrust ball bearing in Embodiment 1 The perspective view of the lower race in Embodiment 1 Figure near the thrust ball bearing when the shaft inclines in the first embodiment The principal part enlarged view of the thrust ball bearing in Embodiment 2 The perspective view of the lower race in Embodiment 2 The principal part enlarged view of the thrust ball bearing in Embodiment 3 The perspective view of the lower race in Embodiment 3 The principal part enlarged view of the thrust ball bearing in Embodiment 4 The perspective view of the lower race in Embodiment 4 The principal part enlarged view of the thrust ball bearing in Embodiment 5 The perspective view of the lower race in Embodiment 5 Longitudinal sectional view of hermetic compressor described in Patent Document 1 Enlarged view of the main part of the thrust ball bearing described in Patent Document 1. A perspective view of a support member given in patent documents 1

According to a first aspect of the present invention, lubricating oil is stored in a sealed container, and an electric element including a stator and a rotor, and a compression element driven by the electric element are accommodated, and the compression element is the rotor. A shaft having a main shaft portion and an eccentric shaft portion fixed to each other, a cylinder block having a compression chamber, a piston that reciprocates in the compression chamber, and a coupling means that couples the piston and the eccentric shaft portion; A main bearing provided on the cylinder block for supporting the main shaft portion; and a thrust ball bearing disposed on a thrust surface of the main bearing, wherein the thrust ball bearing comprises a plurality of balls held by a holder portion. And an upper race and a lower race respectively disposed above and below the ball, wherein the lower race has an elastic shape.

  With this configuration, even if the shaft is slightly inclined and the upper race following the shaft is inclined, the shape of the lower race can absorb the difference in height of each ball due to the inclination of the upper race. Since the lower race has the function of the support member that has been arranged between the thrust ball bearing and the thrust surface of the main bearing, the support member can be omitted. The number of bearing parts can be reduced, and productivity can be improved.

  According to a second aspect of the present invention, lubricating oil is stored in an airtight container, and an electric element including a stator and a rotor, and a compression element driven by the electric element are accommodated, and the compression element is the rotor. A shaft having a main shaft portion and an eccentric shaft portion fixed to each other, a cylinder block having a compression chamber, a piston that reciprocates in the compression chamber, and a coupling means that couples the piston and the eccentric shaft portion; A main bearing provided on the cylinder block for supporting the main shaft portion; and a thrust ball bearing disposed on a thrust surface of the main bearing, wherein the thrust ball bearing comprises a plurality of balls held by a holder portion. And an upper race and a lower race respectively disposed above and below the ball, the front surface of the lower race and the thrust surface being arranged in parallel. .

  With this configuration, even if the shaft is slightly inclined and the upper race following the shaft is inclined, the shape of the lower race can absorb the difference in height of each ball due to the inclination of the upper race. Since the lower race has the function of the support member that has been arranged between the thrust ball bearing and the thrust surface of the main bearing, the support member can be omitted. The number of bearing parts can be reduced, and productivity can be improved.

  In the third invention, the lower race is made to have elasticity by making the lower race of the first and second inventions into a truncated cone shape. Since the lower race has a truncated cone shape, dust such as iron powder is used. Can easily flow from the surface of the lower race, and iron powder or the like hardly accumulates on the surface of the lower race, so that the reliability can be improved in addition to the effects of the first invention.

  According to a fourth aspect of the invention, in particular, the lower race is shaped like a mortar by giving the lower race a mortar shape, and the lower race has a mortar shape. During this period, the lubricating oil tends to accumulate, and the lubrication of the ball is improved, so that the reliability can be improved in addition to the effects of the first invention.

  In the fifth aspect of the invention, in particular, the outer periphery of the lower race has a flat shape, the contact area with the thrust part of the cylinder block increases, and the surface pressure between the lower race and the thrust part of the main bearing decreases. Since the wear of the contact portion can be suppressed, the reliability can be further improved in addition to the effect of the second invention.

In the sixth aspect of the invention, in particular, the inner periphery of the lower race of the fourth aspect of the invention has a flat shape, the contact area with the thrust portion of the cylinder block is increased, and the surface pressure between the lower race and the thrust portion of the main bearing is increased. Since the wear of the contact portion can be suppressed, the reliability can be further improved in addition to the effect of the third invention.

  In the seventh invention, notches are provided in the inner peripheral portion of the lower race of the fourth and sixth inventions in particular, and since the contamination accumulated inside the mortar shape can be discharged, the third and fifth In addition to the effects of the present invention, the reliability can be further improved.

  An eighth invention has a refrigerant circuit in which a hermetic compressor, a radiator, a decompressor, and a heat absorber are connected in an annular shape by piping, and the hermetic compressor is any one of the first to seventh inventions. Since the refrigeration apparatus is a hermetic compressor, the power consumption of the refrigeration apparatus can be reduced and energy can be saved by mounting the hermetic compressor with improved efficiency.

  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 Embodiment 1 of the present invention. FIG. 2 is an enlarged view of the main part of the thrust ball bearing, and FIG. 3 is a perspective view of the lower race.

  In FIGS. 1 to 3, the lubricating oil 204 is stored in the bottom of the sealed container 202, and the compressor main body 206 is elastically supported in the sealed container 202 by the suspension spring 208. The sealed container 202 is filled with R600a (isobutane), which is a refrigerant with a low global warming potential.

  The compressor body 206 includes an electric element 210 and a compression element 212 driven by the electric element 210, and a power supply terminal 213 for supplying power to the electric element 210 is attached to the sealed container 202.

  First, the electric element 210 will be described.

  The electric element 210 includes a stator 214 formed by winding a copper wire around an iron core in which thin plates are laminated, and a rotor 216 arranged on the inner diameter side of the stator 214, and the winding of the stator 214 is a power source. The terminal 213 is connected to a power source (not shown) outside the hermetic compressor by a conductive wire.

  Next, the compression element 212 will be described.

  The compression element 212 is disposed above the electric element 210.

  A shaft 218 constituting the compression element 212 includes a main shaft portion 220 and an eccentric shaft portion 222 parallel to the main shaft portion 220. A rotor 216 is fixed to the main shaft portion 220.

  The cylinder block 224 includes a main bearing 226 having a cylindrical inner surface, and the main shaft portion 220 is rotatably inserted into and supported by the main bearing 226. The compression element 212 is configured as a cantilever bearing that supports the load acting on the eccentric shaft portion 222 with the main shaft portion 220 and the main bearing 226 disposed below the eccentric shaft portion 222.

  Further, the shaft 218 includes an oil supply mechanism 229 including a spiral groove 228 provided on the surface of the main shaft portion 220.

The cylinder block 224 includes a cylinder 234 that is a cylindrical hole, and the piston 230 is reciprocally inserted into the cylinder 234.

  Further, the connecting means 236 is connected to the eccentric shaft portion 222 and the piston 230 by fitting the hole portions provided at both ends into the piston pin 238 and the eccentric shaft portion 222 attached to the piston 230, respectively.

  A valve plate 246 is attached to the end surface of the cylinder 234 and forms a compression chamber 248 together with the cylinder 234 and the piston 230. Further, the cylinder head 250 is fixed so as to cover the valve plate 246 and cover it. The suction muffler 252 is molded from a resin such as PBT, forms a sound deadening space inside, and is sandwiched between the valve plate 246 and the cylinder head 250.

  Next, the thrust ball bearing will be described.

  FIG. 2 is an enlarged view of a main part of the thrust ball bearing.

  The main bearing 226 includes a thrust surface 260 that is a flat portion perpendicular to the shaft center, and a tubular extension 262 that extends further upward than the thrust surface 260 and has an inner surface facing the main shaft portion 220.

  An upper race 264 is arranged on the upper side of the tubular extension 262, and a ball 266 held by the holder 268 and a lower race 270 are arranged in this order on the outer diameter side of the tubular extension 262 and on the lower side of the upper race 264. A thrust ball bearing 276 is formed.

  The holder portion 268 is formed of a resin material such as polyamide, has an annular shape, and has a plurality of hole portions in which the balls 266 are movably accommodated.

  The upper race 264 is a ring-shaped metal flat plate made of heat-treated spring steel or the like, and the upper and lower surfaces are parallel and the surface is finished smooth.

  The lower race 270 has an annular shape as shown in FIGS. 2 and 3, is formed of heat-treated spring steel or the like, and has a truncated cone shape whose upper and lower surfaces are parallel and elastic in the vertical direction.

  The lower race 270 has an upper surface located on the upper race 264 side and in contact with the ball 266 and a lower surface located on the thrust surface 260 side.

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

  When the electric element 210 is energized from the power supply terminal 213, the rotor 216 rotates with the shaft 218 by the magnetic field generated in the stator 214. As the main shaft portion 220 rotates, the eccentric shaft portion 222 also rotates eccentrically, and the piston 230 is reciprocated in the cylinder 234 by the connecting means 236. Then, when the compression chamber 248 changes in volume, the refrigerant in the hermetic container 202 is sucked into the compression chamber 248 and compressed.

  In the suction stroke accompanying this compression operation, the refrigerant in the sealed container 202 is intermittently sucked into the compression chamber 248 via the suction muffler 252 and compressed in the compression chamber 248, and then the high-temperature and high-pressure refrigerant is discharged. It is sent to a refrigeration cycle (not shown) outside the sealed container 202 via a pipe 254 or the like.

Further, the lower end of the shaft 218 is immersed in the lubricating oil 204, and by rotating the shaft 218, the lubricating oil 204 is conveyed above the compression element 212 by the oil supply mechanism 228, and a part thereof from the upper end of the eccentric shaft portion 222. Released.

  Next, the thrust ball bearing 276 will be described.

  Thrust ball bearing 276 has a plurality of balls 266 of the same size placed between flat upper race 264 and lower race 270 so that each rolls in a point contact state. The efficiency of the hermetic compressor can be improved by reducing the sliding loss.

  Oil supply to the thrust ball bearing 276 is achieved by supplying the lubricating oil 204 mainly scattered from the upper end of the eccentric shaft portion 222 or the like from the outer diameter side of the thrust ball bearing 276.

  Next, the lower race will be described. The lower race 270 has a truncated cone shape having elasticity. With this shape, it is possible to prevent circular dents from being generated by the balls 266 on the rolling surfaces of the upper race 264 and the lower race 270 on which the balls 266 of the thrust ball bearing 276 roll due to impact such as dropping during transportation. .

  Further, in the configuration of the cantilever bearing in which the main shaft portion 220 is supported by the main bearing 226, the shaft 218 has a gap between the main shaft portion 220 and the main bearing 226 due to a load generated when the piston compresses the refrigerant in the compression chamber. A slight tilt is inevitable.

  In the present embodiment, as shown in FIG. 4, the lower race 270 is different from the height of each ball 266 due to the inclination of the upper race 264 due to the truncated cone shape of the lower race 270 even if the upper race 264 is inclined following the shaft 218. Can be absorbed, and the load acting on each ball 266 can be made uniform to prevent the life of the thrust ball bearing 276 from being reduced.

  Therefore, the support member 72 required in the conventional configuration can be omitted, the number of parts of the thrust ball bearing 276 can be reduced, and productivity can be improved. Further, since the lower race 270 has a truncated cone shape, even if dust such as iron powder enters the lubricating oil and is supplied to the thrust ball bearing 276 together with the lubricating oil, the lower race 270 easily flows from the surface of the lower race 270. Iron powder or the like is unlikely to accumulate on the surface of the race 270, and foreign matter biting can be suppressed, and reliability can be improved.

(Embodiment 2)
FIG. 5 is an enlarged view of a main part of a thrust ball bearing according to Embodiment 2 of the present invention, and FIG. 6 is a perspective view of a lower race. Hereinafter, differences from the first embodiment will be described. In the second embodiment, the shape of the lower race 370 is a mortar shape.

  With this shape, the same effect as in the first embodiment can be obtained. Further, since the lower race 370 has a mortar shape, the lubricating oil 204 can be stored in the space formed by the tubular cylindrical portion 262 and the lower race 370, the lubrication of the thrust ball bearing 376 is improved, and wear is reduced. Generation | occurrence | production can be suppressed and reliability can be improved.

  Further, since the lower race has a mortar shape, the lubricating oil is likely to accumulate between the lower race and the tubular extension, and the lubrication of the ball is improved and the reliability can be improved in addition to the effects of the first embodiment.

(Embodiment 3)
FIG. 7 is an enlarged view of a main part of a thrust ball bearing according to Embodiment 3 of the present invention, and FIG. 8 is a perspective view of a lower race. Hereinafter, differences from the first embodiment will be described.

  In the third embodiment, a flat portion 471 is formed on the outer periphery of the lower race 270 of the first embodiment. The lower race 270 comes into contact with the thrust surface 260 and slides slightly during operation, which may cause wear. However, since the lower race 470 comes into surface contact with the thrust surface 260 by the flat portion 471, the lower race 470 and the thrust surface 260 are in contact with each other. The surface pressure can be reduced, wear due to minute sliding can be suppressed, and reliability can be improved.

  Further, the contact area with the thrust portion of the cylinder block is increased, the surface pressure between the lower race and the thrust portion of the main bearing is lowered, and wear of the contact portion can be suppressed, so that the reliability can be improved.

(Embodiment 4)
FIG. 9 is an enlarged view of a main part of a thrust ball bearing according to Embodiment 4 of the present invention, and FIG. 10 is a perspective view of a lower race. Hereinafter, differences from the second embodiment will be described.

  In the fourth embodiment, a flat portion 571 is configured on the inner periphery of the lower race 270 of the second embodiment. The lower race 270 comes into contact with the thrust surface 260 and slides slightly during operation, which may cause wear. However, since the lower race 570 comes into surface contact with the thrust surface 560 by the flat portion 571, the lower race 570 and the thrust surface are in contact with each other. The surface pressure with 260 is reduced, wear due to minute sliding can be suppressed, and reliability can be improved.

  Further, the contact area with the thrust portion of the cylinder block is increased, the surface pressure between the lower race and the thrust portion of the main bearing is lowered, and wear of the contact portion can be suppressed, so that the reliability can be improved.

(Embodiment 5)
FIG. 11 is an enlarged view of a main part of a thrust ball bearing according to Embodiment 5 of the present invention, and FIG. 12 is a perspective view of a lower race. Hereinafter, differences between the second and fourth embodiments will be described.

  In the fifth embodiment, a notch 680 is formed on the inner periphery of the lower race 570. Since the lower race 670 has a mortar shape, the lubricating oil 204 is stored in the space formed by the tubular cylindrical portion 262 and the lower race 670. At the same time, a substance that adversely affects sliding such as contamination is stored. There is a possibility. Therefore, by forming the notch 680, it is possible to discharge the contamination accumulated on the bottom of the storage portion 682, and the reliability can be further improved.

  Further, since the contaminants accumulated inside the mortar shape can be discharged, the reliability can be improved.

  As described above, since the hermetic compressor according to the present invention can reduce the number of parts of the thrust ball bearing and improve the productivity, it is not limited to an electric refrigerator-freezer for home use, an air conditioner, and a vending machine. And widely applicable to other refrigeration apparatuses.

202 Sealed container 204 Lubricating oil 210 Electric element 212 Compression element 214 Stator 216 Rotor 218 Shaft 220 Main shaft portion 222 Eccentric shaft portion 224 Cylinder block 226 Main bearing 230 Piston 236 Connecting means 248 Compression chamber 260 Thrust surface 264 Upper race 266 Ball 268 Holder part 270 Lower race 276 Thrust ball bearing 680 Notch

Claims (8)

Lubricating oil is stored in a sealed container, and an electric element having a stator and a rotor and a compression element driven by the electric element are accommodated, and the compression element is a main shaft portion to which the rotor is fixed. And a shaft having an eccentric shaft portion, a cylinder block having a compression chamber, a piston reciprocating in the compression chamber, a connecting means for connecting the piston and the eccentric shaft portion, and the cylinder block. A main bearing that supports the main shaft portion; and a thrust ball bearing disposed on a thrust surface of the main bearing, the thrust ball bearing comprising: a plurality of balls held by a holder portion; A hermetic compressor comprising an upper race and a lower race respectively disposed in the upper race and the lower race, wherein the lower race has a shape having elasticity in the vertical direction. Lubricating oil is stored in a sealed container, and an electric element having a stator and a rotor and a compression element driven by the electric element are accommodated, and the compression element is a main shaft portion to which the rotor is fixed. And a shaft having an eccentric shaft portion, a cylinder block having a compression chamber, a piston reciprocating in the compression chamber, a connecting means for connecting the piston and the eccentric shaft portion, and the cylinder block. A main bearing that supports the main shaft portion; and a thrust ball bearing disposed on a thrust surface of the main bearing, the thrust ball bearing comprising: a plurality of balls held by a holder portion; And an upper race and a lower race, respectively, and the upper surface of the lower race and the thrust surface are arranged so as not to be parallel to each other. Type compressor. The hermetic compressor according to claim 1 or 2, wherein the lower race has a truncated cone shape. The hermetic compressor according to claim 1 or 2, wherein the lower race has a mortar shape. The hermetic compressor according to claim 3, wherein the outer periphery of the lower race is flat. The hermetic compressor according to claim 4, wherein the inner periphery of the lower race is flat. The hermetic compressor according to claim 4 or 6, wherein a notch is provided in the inner periphery of the lower race. A refrigerator using the hermetic compressor according to any one of claims 1 to 7.