JP2010229833A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-vibration compressor reducing the vibration propagated from a coil spring 117 to a hermetic container 101. <P>SOLUTION: A shell side snubber 119 is inserted to the inner diameter part 121 of a washer 120. A coil spring 117 is seated on the upper end surface 122 of a compressor side snubber 118 of the washer 120. Lubricating oil 105 flows into the two contact surfaces between the coil spring 117 and the washer 120 and between the washer 120 and the hermetic container 101, to form oil dampers on the contact surfaces 125, 126. Thus, the propagation of the vibration from an electric compression element 109 is reduced by the dumping effect of the lubricating oil 105. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an improvement in a snubber bar of a hermetic compressor mainly used in a freezer / refrigerator, an air conditioner or the like.

  As a conventional hermetic compressor, there is one having a snubber bar for reducing vibration and noise in a hermetic container (for example, see Patent Document 1).

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

  4 is a longitudinal sectional view of a conventional hermetic compressor, FIG. 5 is a transverse sectional view of the conventional hermetic compressor, and FIG. 6 is an enlarged cross-sectional view of a main part of the conventional hermetic compressor.

  4, 5, and 6, the sealed container 1 includes a discharge pipe 2 and a suction pipe 3 that are connected to a cooling system (not shown), stores the lubricating oil 5 in the bottom portion 4, and the stator 6. An electric element 8 composed of a rotor 7 and an electric compression element 9 driven thereby are accommodated.

  The electric compression element 9 connects the block 11 forming the cylinder 10, the piston 12 removably inserted into the cylinder 10, the shaft 15 including the main shaft portion 13 and the eccentric portion 14, and the eccentric portion 14 and the piston 12. A connecting rod 16, a rotor 7 is fixed to the main shaft portion 13, and a stator 6 is fixed to the block 11.

  The electric compression element 9 is elastically supported in the sealed container 1 by a plurality of coil springs 17. The coil spring 17 includes a compressor-side snubber bar 18 that is a protrusion provided on the electric compression element 109 side, and the closed container 1. Both ends are held by a shell side snubber bar 19 which is a protrusion provided on the side.

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

  During operation, when electricity is supplied to the electric element 8, the rotor 7 rotates, the shaft 15 is rotationally driven, and the rotational movement of the shaft 15 is transmitted to the piston 12 by the connecting rod 16 to perform the compression operation.

  At this time, the electric element 8 generates rotational torque according to the compression load generated by the electric compression element 9, and the electric compression element 9 continues the compression operation.

At this time, the electric compression element 9 vibrates with the compression operation. This vibration is transmitted to the sealed container 1 through the coil spring 17 and the shell side snubber bar 19. At this time, the vibration of the electric compression element 9 is absorbed by the elasticity of the coil spring 17, so that the vibration propagating to the sealed container 1 is attenuated, and the vibration of the whole hermetic compressor is reduced.
Japanese Patent No. 2904894

However, in the above conventional configuration, the vibration of the electric compression element 9 is greatly absorbed by the elasticity of the coil spring 17, but the coil spring 17 is press-fitted and fixed to the shell-side snubber bar 19, and the end surface of the coil spring 17 is in direct contact with the sealed container 1. Therefore, the vibration that cannot be absorbed by the coil spring 17 directly propagates to the sealed container 1 as the longitudinal vibration of the coil spring 17, thereby increasing the vibration of the entire sealed container 1. .

  Further, the inner diameter side of the coil spring 17 is in contact with the shell-side snubber bar 19 and the substantial vertical spring constant of the coil spring 17 is increased. Therefore, in a state where the discharge pressure or suction pressure immediately before the stop is high or the balance pressure at the time of startup is high. Since the compression load is large, the vibration of the electric compression element 9 increases.

  As a result, the vibration of the electric compression element 9 is transmitted through the coil spring 17 and is directly transmitted to the sealed container 1 via the shell-side snubber bar 19, so that the vibration of the hermetic compressor is increased.

  An object of the present invention is to solve the above-described conventional problems and to provide a low-vibration hermetic compressor that reduces vibration propagation from the coil spring 17 to the hermetic container 1.

  In order to solve the above-described conventional problems, a hermetic compressor according to the present invention includes a shell-side snubber bar inserted into an inner diameter portion of a washer, and a coil spring seated on the upper end surface of the compressor-side snubber bar of the washer. The lubricating oil flows into the two contact surfaces of the washer, the washer and the sealed container, so that an oil damper is formed on the contact surface, and the vibration of the electric compression element is transmitted to the sealed container due to the damping effect of the lubricating oil. It has the effect that it can be reduced.

  In the hermetic compressor of the present invention, an oil damper is formed on the two contact surfaces of the coil spring and the washer, and the washer and the hermetic container, and the propagation of vibration of the electric compression element can be reduced by the damping effect of the lubricating oil. Propagation of vibration from the container to the sealed container can be reduced, and a low-vibration hermetic compressor can be provided.

  The invention according to claim 1 includes a coil spring that elastically supports the electric compression element accommodated in the hermetic container and contains the lubricating oil in the hermetic container, and the coil spring is on the electric compression element side. Both ends are inserted into the compressor-side snubber bar, which is a protrusion provided on the shell, and the shell-side snubber bar, which is a protrusion provided on the sealed container side, and the inner diameter portion of the washer is inserted into the shell-side snubber bar. The coil spring is seated on the upper end surface of the compressor-side snubber bar, and at least the lower end of the coil spring is located in the lubricating oil, reducing the propagation of vibration due to internal damping of vibration in the washer, and the coil spring And the washer, the washer, and the sealed container are kept in contact with the lubricating oil to form an oil damper. Vibration of the electric compression element by damping effect can be reduced to be propagated in a closed container that can reduce the propagation of vibrations to the sealed container of a coil spring, it is possible to provide a hermetic compressor low vibration.

  The invention according to claim 2 is the invention according to claim 1, wherein the coil spring is loosely fitted to the shell-side snubber bar, and it is possible to suppress the vibration from being directly transmitted from the coil spring to the shell-side snubber bar. A radial gap is formed between the inner diameter side of the shell and the outer periphery of the shell-side snubber bar, and when the lubricating oil flows into the gap, an oil damper is also formed in the radial direction. Since the vibration of the electric compression element can be prevented from propagating to the sealed container due to the effect, the vibration can be further reduced in addition to the effect of the invention of the first aspect.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the washer is loosely fitted to the shell-side snubber bar, and vibration is propagated from the coil spring to the shell-side snubber bar via the washer. In addition, a radial gap is formed between the inner diameter portion of the washer and the outer periphery of the shell-side snubber bar, and lubricating oil flows into the gap, so that the inner diameter portion of the washer and the outer periphery of the shell-side snubber bar Since the oil damper is formed in the gap in the radial direction, the vibration of the electric compression element can be reduced from being propagated to the sealed container due to the damping effect of the lubricating oil. In addition to the effect of the invention according to claim 1 or 2, Further, vibration can be reduced.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the washer is magnetized, and the washer is attracted and fixed at a predetermined position with respect to the shell-side snubber bar by a magnetic force. This prevents vibrations from propagating from the coil spring to the shell-side snubber bar through the washer, and ensures a radial clearance over the entire circumference between the inner diameter of the washer and the outer periphery of the shell-side snubber bar. When the lubricating oil flows into the gap, an oil damper is formed in the radial gap between the inner diameter portion of the washer and the outer periphery of the shell side snubber bar. Can reliably reduce the propagation of vibrations to the sealed container, and foreign matter such as iron powder floating in the lubricating oil In addition to the invention according to any one of claims 1 to 3, since vibration can be prevented and foreign matter can be prevented from flowing into the main shaft portion and the cylinder, vibration can be reduced more reliably and reliability can be reduced. It is possible to provide a high-pressure hermetic compressor.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, further comprising contact prevention means for preventing contact between the inner diameter portion of the washer and the shell-side snubber bar. It is possible to reliably prevent vibration from directly propagating to the shell-side snubber via, and without the need for special assembly, the washer can be disposed at a predetermined position with respect to the shell-side snubber bar, Since contact between the washer and the shell-side snubber bar due to assembly variation can be prevented, in addition to the effect of the invention according to any one of claims 1 to 4, it is possible to further reduce vibration and reduce variation. it can.

(Embodiment 1)
1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention, FIG. 2 is a transverse sectional view of the hermetic compressor according to the same embodiment, and FIG. 3 is a diagram of the hermetic compressor according to the same embodiment. It is a principal part expanded sectional view.

  1, 2, and 3, the sealed container 101 includes a discharge pipe 102 and a suction pipe 103 that are connected to a cooling system (not shown), stores a lubricating oil 105 in a bottom portion 104, and a stator 106. An electric element 108 including the rotor 107 and an electric compression element 109 driven by the electric element 108 are accommodated.

  The electric compression element 109 connects the block 111 forming the cylinder 110, the piston 112 reciprocally inserted into the cylinder 110, the shaft 115 including the main shaft portion 113 and the eccentric portion 114, and the eccentric portion 114 and the piston 112. The connecting rod 116 and the connecting rod 116 are fixed, and the rotor 107 is fixed to the main shaft portion 113, and the stator 106 is fixed to the block 111.

  The electric compression element 109 is elastically supported in the sealed container 101 by a plurality of coil springs 117.

An inner diameter portion 121 of a washer 120 is inserted in advance into the shell-side snubber bar 119, and a coil spring 117 is formed by a compressor-side snubber bar 118, which is a protrusion provided on the electric compression element 109 side, and a protrusion provided on the sealed container 101 side. Both ends of the shell-side snubber bar 119 are inserted, and a coil spring 117 is seated on the upper end surface 122 of the washer 120 on the compressor-side snubber bar 118 side.

  The coil spring 117 is loosely fitted to the shell-side snubber bar 119, and at least the lower end 123 of the coil spring 117 is located in the lubricating oil 105.

  The washer 120 is loosely fitted to the shell-side snubber bar 119 and magnetized.

  Further, the outer periphery of the shell-side snubber bar 119 of the sealed container 101 is provided with a recess 124 that is a contact prevention means for preventing contact between the inner diameter portion 121 of the washer 120 and the shell-side snubber bar 119. The shape is engageable with the shape.

  Further, the washer 120 and the shell-side snubber bar 119 are formed so as not to contact each other if the washer 120 is engaged with the recess 124.

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

  During operation, when electricity is supplied to the electric element 108, the rotor 107 rotates, the shaft 115 is rotationally driven, and the rotational motion of the shaft 115 is transmitted to the piston 112 by the connecting rod 116, thereby performing a compression operation.

  At this time, the electric element 108 generates rotational torque according to the compression load generated by the electric compression element 109 and continues the compression operation.

  At this time, the electric compression element 109 vibrates with the compression operation. This vibration propagates through the coil spring 117 and propagates to the sealed container 101 via the shell-side snubber bar 119. However, the vibration propagating to the sealed container 101 is greatly absorbed by the elasticity of the coil spring 117 due to the elasticity of the coil spring 117. The vibration of the whole hermetic compressor can be reduced.

  Here, the elasticity of the coil spring 117 alone cannot completely absorb the vibration of the electric compression element 109 and the vibration propagates to the sealed container 101. However, the inner diameter portion 121 of the washer 120 is inserted into the shell-side snubber bar 119, and the washer Since the coil spring 117 is seated on the upper end surface 122 on the compressor side snubber 118 side of the 120 and the lower end 123 of the coil spring 117 is located in the lubricating oil 105, vibration is generated in the sealed container 101 by internal damping of vibration in the washer 120. Propagation can be reduced.

  Furthermore, two contact surfaces 125 and 126 of the coil spring 117 and the washer 120, and the washer 120 and the sealed container 101 are formed, and the lubricating oil 105 is held on the contact surfaces 125 and 126 to form an oil damper.

  As a result, the vibration energy of the electric compression element 109 is converted into heat energy, and this conversion action becomes a damping effect by the lubricating oil 105, so that the vibration of the electric compression element 109 can be reduced from being propagated to the sealed container 101, and the coil spring. A hermetic compressor with low vibration and reduced vibration propagation from 117 to the hermetic container 101 can be provided.

It should be noted that the washer 120 can lower the Young's modulus to increase the damping effect of the washer 120, and as a result, the vibration of the electric compression element 109 can be further reduced.

  Further, since the coil spring 117 is loosely fitted to the shell-side snubber bar 119, it is possible to suppress the propagation of vibration from the coil spring 117 directly to the sealed container 101 via the shell-side snubber bar 119.

  Further, a radial gap is formed between the inner diameter side of the coil spring 117 and the outer periphery of the shell-side snubber bar 119, and the lubricating oil 105 flows into the gap, so that an oil damper is also formed in the radial direction. Therefore, the vibration of the electric compression element 109 can be propagated to the sealed container 101 by the damping effect by the lubricating oil 105.

  Furthermore, when the shell-side snubber bar 119 is press-fitted and fixed, the longitudinal spring constant of the coil spring 117 increases at the press-fitting fixing portion. However, in this embodiment, the coil spring 117 is not press-fitted and fixed to the shell-side snubber bar 119. Since the coil spring 117 is fitted, the longitudinal spring constant of the coil spring 117 does not increase, and the coil spring 117 can be used with the longitudinal spring constant of the coil spring 117 alone.

  Therefore, the longitudinal spring constant of the coil spring 117 is also obtained in a condition where the compression load is high and the vibration of the electric compression element 109 is large when the discharge pressure or suction pressure immediately before the stop is high or the balance pressure at the time of startup is high. Therefore, the characteristics as the coil spring 117 can be stably exhibited even under the above operating conditions, and the propagation of vibration of the electric compression element 109 can be reduced.

  Further, since the washer 120 is loosely fitted to the shell-side snubber bar 119, it is possible to suppress the propagation of vibration from the coil spring 117 to the shell-side snubber bar 119 via the washer 120.

  Further, a radial gap is formed between the inner diameter portion 121 of the washer 120 and the outer periphery of the shell-side snubber bar 119, and the lubricating oil 105 flows into the gap, whereby the inner diameter portion 121 of the washer 120 and the shell side Since the oil damper is formed in the radial gap with the outer periphery of the snubber bar 119, it is possible to reduce the vibration of the electric compression element 109 from propagating to the sealed container 101 due to the damping effect by the lubricating oil 105.

  Further, since the washer 120 is magnetized, the washer 120 is surely attracted and fixed at a predetermined position with respect to the shell-side snubber bar 119, and the fixed position shifts even when the electric compression element 109 is vibrated or shocked by transportation. Can be prevented.

  As a result, a radial gap is surely formed over the entire circumference between the inner diameter portion 121 of the washer 120 and the outer periphery of the shell-side snubber bar 119, and the lubricating oil 105 flows into the gap, whereby the washer 120 Since the oil damper is formed in the radial gap between the inner diameter portion 121 and the outer periphery of the shell-side snubber bar 119, it is possible to reliably reduce the vibration of the electric compression element 109 from propagating to the sealed container 101.

  Furthermore, foreign matter such as iron powder floating in the lubricating oil 105 can be adsorbed and foreign matter can be prevented from flowing into the main shaft portion 113 or the cylinder 110. Therefore, it is possible to prevent an increase in input due to scratches, and thus improve reliability.

Since the lower end 123 of the coil spring 117 is located in the lubricating oil 105, the above-described oil damper can be formed permanently, and the damping effect of the oil damping can be changed by the viscosity of the lubricating oil 105. And an optimal oil damping effect can be obtained.

  Further, even in a hermetic compressor having different cylinder volumes, vibration propagation of the electric compression element 109 can be permanently reduced by oil damping.

  A recess 124 is provided as a contact preventing means for preventing contact between the inner diameter portion 121 of the washer 120 and the shell-side snubber bar 119. The recess 124 can be engaged with the outer shape of the washer 120, and the washer 120 is engaged with the recess 124. If they are arranged together, the washer 120 and the shell-side snubber bar 119 are formed so as not to contact each other.

  Therefore, the washer 120 and the shell-side snubber bar 119 do not come into contact with each other, and the washer 120 can be disposed at a predetermined position with respect to the shell-side snubber bar 119 without requiring special assembly. And the shell-side snubber bar 119 can be prevented, vibration can be reduced, and variation in vibration among hermetic compressors can be reduced.

  Further, the washer 120 can regulate the deviation within the clearance with the concave portion 124, and the assembly is only performed by inserting the washer 120 into the shell-side snubber bar 119, and the productivity is good.

  In this embodiment, the metal washer 120 is exemplified, but the elastic member is represented by tetrafluoroethylene, polybutylene naphthalate, polybutylene terephthalate, and polyphenylene sulfide, which have high vibration damping ability and elasticity. Needless to say, even if a washer 120 made of an elastic member molded from a fluororesin is inserted, the same effects and advantages can be obtained.

  In the embodiment of the present invention, the washer 120 is disposed so as to be in contact with the bottom 104 of the sealed container 101 and the recess 124 is formed in the bottom 104 of the sealed container 101. However, the shell-side snubber 119 is described. It can be similarly implemented by forming a flange portion on the bottom surface and the washer 120 in contact with the flange portion and forming the recess 124 in the bottom portion 104 of the sealed container 101.

  As described above, the hermetic compressor according to the present invention can provide a low-vibration compressor with reduced vibration propagation from the coil spring to the hermetic container. Therefore, the hermetic compressor can be used for applications such as an air conditioner and a refrigerator-freezer. Applicable.

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 same embodiment The principal part expanded sectional view of the hermetic compressor in the embodiment 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

DESCRIPTION OF SYMBOLS 101 Airtight container 105 Lubricating oil 109 Electric compression element 117 Coil spring 118 Compressor side snubber bar 119 Shell side snubber bar 120 Washer 121 Inner diameter part 122 Upper end surface 123 Lower end

Claims (5)

A compressor comprising a coil spring for elastically supporting an electric compression element accommodated in the hermetic container and elastically supporting the electric compression element accommodated in the hermetic container, wherein the coil spring is a protrusion provided on the electric compression element side Both end portions are inserted into a side snubber bar and a shell side snubber bar which is a protrusion provided on the closed container side, an inner diameter portion of a washer is inserted into the shell side snubber bar, and an upper end surface of the washer on the compressor side snubber side The hermetic compressor is characterized in that the coil spring is seated and at least the lower end of the coil spring is located in the lubricating oil. The hermetic compressor according to claim 1, wherein the coil spring is loosely fitted to the shell-side snubber bar. The hermetic compressor according to claim 1 or 2, wherein the washer is loosely fitted to the shell-side snubber bar. The hermetic compressor according to any one of claims 1 to 3, wherein the washer is magnetized. The hermetic compressor according to any one of claims 1 to 4, further comprising contact prevention means for preventing contact between the inner diameter portion of the washer and the shell-side snubber bar.