JP2010038010A - Closed compressor - Google Patents

Abstract

The present invention provides a hermetic compressor that improves assembly performance and improves vibration and noise by improving the insertability of a coil spring and a snubber bar.
A lubricating oil 103 is accommodated in a hermetic container 101 and a coil spring 111 elastically supporting an electric compression element 109 is provided, and either a compressor side snubber bar 125 or a shell side snubber bar 113 is magnetized. In addition, the coil spring 111 is loosely fitted with the coil spring 111, so that the coil spring 111 can be easily inserted into the snubber bars 125 and 113, and the assemblability is improved. A hermetic compressor can be provided.
[Selection] Figure 2

Description

  The present invention relates to a hermetic compressor used for a freezer and the like.

  Conventionally, this type of hermetic compressor has a coil spring press-fitted into a snubber bar (see, for example, Patent Document 1).

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

  FIG. 3 is a longitudinal sectional view of a conventional hermetic compressor described in Patent Document 1, and FIG. 4 is an enlarged cross-sectional view of a main part of the conventional hermetic compressor.

  3 and 4, the hermetic container 1 contains a lubricating oil 3 and an electric compression element 7 elastically supported by a plurality of coil springs 5.

  Further, the sealed container 1 is provided with a shell-side snubber bar 9, and a coil spring 5 is press-fitted and fitted therein.

  The electric compression element 7 includes a cylinder 13 that forms a compression chamber 11, a piston 15 that is slidably inserted into the compression chamber 11, a shaft 17 that reciprocates the piston 15, and a compression that is inserted into the coil spring 5. A machine-side snubber bar 19 is provided.

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

  When the electric compression element 7 is energized from an external power source, the piston 15 reciprocates in the compression chamber 11 and the electric compression element 7 performs a predetermined compression operation.

  Thereby, the refrigerant flowing from the cooling system (not shown) is sucked into the compression chamber 11.

  Then, the refrigerant guided to the compression chamber 11 is compressed in the compression chamber 11 by the reciprocating motion of the piston 15 and then discharged again to a cooling system (not shown).

When the refrigerant suction and compression operations are repeated, the electric compression element 7 generates mechanical vibrations by compressing the refrigerant by the reciprocating motion of the piston 15. However, the transmission of the vibrations to the sealed container 1 is attenuated. In order to reduce the vibration of the sealed container 1, the electric compression element 7 is elastically supported by the coil spring 5.
JP 2001-73947 A

  However, since the coil spring 5 is press-fitted into the shell-side snubber bar 9 in the above-described conventional configuration, vibration that cannot be damped by the coil spring 5 is transmitted to the sealed container 1, and in particular, it is difficult to reduce harmonic vibration. Had the problem of being.

  Further, there is a problem that rubbing vibration occurs between the coil spring 5 and the shell-side snubber bar 9 and the vibration cannot be reduced.

  In general, the coil spring 5 is generally press-fitted into the shell-side snubber 9 in advance. However, the assembly performance deteriorates because the coil spring 5 is securely pressed in the production process of the compressor. Had.

  In order to solve the above conventional problems, the hermetic compressor of the present invention is one in which either the compressor-side snubber bar or the shell-side snubber bar is magnetized and loosely fitted with a coil spring that elastically supports the electric compression element. Therefore, the coil spring can be assembled by simply inserting the coil spring without press-fitting, and the coil spring and the snubber bar are loosely fitted. Therefore, vibration can be suppressed by reducing friction between the coil spring and the snubber bar, and electric It has the effect | action that the vibration transmission of a compression element can be suppressed.

  The hermetic compressor of the present invention includes a coil spring that elastically supports an electric compression element while containing lubricating oil in a hermetic container, and either the compressor-side snubber bar or the shell-side snubber bar is magnetized. It is loosely fitted with the coil spring, and the coil spring can be easily inserted into the snubber bar, and a hermetic compressor with low vibration and noise can be provided by suppressing vibration transmission of the electric compression element.

  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 a compressor-side snubber bar that is a protrusion provided on the shell and a shell-side snubber bar that is a protrusion provided on the sealed container side, and either the compressor-side snubber bar or the shell-side snubber bar is magnetized. Since the snubber bar is magnetized and the snubber bar is magnetized, the assembly is improved by easily inserting the coil spring into the snubber bar when the hermetic compressor is assembled, and the snubber bar and the coil spring are loosely fitted. Therefore, vibration can be suppressed by reducing friction between the coil spring and the snubber bar, and vibration transmission of the electric compression element can be suppressed. It is possible to win, good assembling property, it is possible to provide a small hermetic compressor vibration and noise.

  The invention according to claim 2 is the invention according to claim 1, wherein the diameter gap between the coil spring and either the compressor-side snubber bar or the shell-side snubber bar that is loosely fitted to the coil spring is 0.01 to Even if a coil spring is inserted into the snubber bar in the assembly process of the hermetic compressor, the magnetic force acting between the snubber bar and the coil spring causes the Since the coil spring can be prevented from falling off, in addition to the effect of the invention according to claim 1, it is possible to provide a hermetic compressor with good assemblability.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the shell side snubber bar is magnetized and at least the lower end of the coil spring is located in the lubricating oil, and the gap between the shell side snubber bar and the coil spring is provided. When the lubricant enters, the vibration due to friction between the shell-side snubber bar and the coil spring is reduced, and the vibration of the electric compression element is suppressed from being directly transmitted to the shell-side snubber bar, and the vibration is attenuated by the lubricant. Therefore, in addition to the effects of the invention described in claim 1 or 2, a hermetic compressor with less vibration and noise can be provided.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein either the compressor side snubber bar or the shell side snubber bar is formed of a resin material and the coil spring is press-fitted. By using a resin-based material for any snubber bar into which the coil spring is press-fitted and fitted, it is possible to reduce vibration transmission of the electric compression element with a snubber bar formed of a resin-based material, and a snubber bar and In addition to the effects of the invention according to any one of claims 1 to 3, a hermetic compressor with less vibration and noise can be provided because the rubbing sound that occurs when the coil spring rubs can be suppressed. Can be provided.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the coil spring is provided with invalid winding portions at both ends, and the portion inserted into the snubber bar of the coil spring is movable. Since it is possible to suppress the occurrence of rubbing between the snubber bar and the coil spring by making the ineffective winding without any of the above, in addition to the effect of the invention according to any one of claims 1 to 4, A hermetic compressor with low vibration and noise can be provided.

  The invention according to claim 6 is the invention according to claim 5, in which the ineffective winding portion of the coil spring is press-fitted into the snubber bar, and the ineffective winding portion of the coil spring does not move and therefore does not move. The frictional noise caused by friction between the snubber bar and the coil spring can be suppressed by press-fitting and inserting the ineffective winding into the snubber bar. In addition to the effects of the invention according to claim 5, the hermetic compressor further reduces vibration and noise. Can be provided.

  Hereinafter, embodiments of a hermetic compressor according to 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 side surface of a hermetic compressor according to Embodiment 1 of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part of the hermetic compressor according to the same embodiment.

  In FIG. 1 and FIG. 2, in the sealed container 101, the lubricating oil 103 is stored at the bottom, and an electric compression element 109 including an electric element 105 and a compression element 107 driven by the electric element 105 is accommodated. .

  The compression element 107 includes a cylinder 119 in which a cylindrical compression chamber 117 is formed, a shaft 121 that is pivotally supported by the cylinder 119 and fixed to the electric element 105, and a piston 123 that is slidably inserted in the compression chamber 117. And.

  The electric compression element 109 has a compressor-side snubber bar 125 that is a protrusion protruding downward, and a shell-side snubber 113 that is a protrusion protruding upward near the bottom of the sealed container 101. Both ends of a plurality of coil springs 111 are inserted into the compressor-side snubber bar 125 and the shell-side snubber bar 113, and the plurality of coil springs 111 elastically support the electric compression element 109.

  The shell-side snubber bar 113 at least partially located in the lubricating oil 103 is made of an iron-based material and is magnetized. The maximum outer diameter of the shell-side snubber bar 113 is set to about 12 mm.

  The compressor-side snubber bar 125 is fixed to the electric compression element 109 with a pin 127, and is formed of polybutylene terephthalate, which is a resin material having refrigerant resistance.

  The coil spring 111 is made of an iron-based material, has a substantially cylindrical shape, and has invalid winding portions 115 at both ends. The inner diameter is set to about 12 mm.

  The coil spring 111 is loosely fitted with the shell-side snubber bar 113, and the diameter gap between the coil spring 111 and the shell-side snubber bar 113 is set within a range of 0.01 to 0.5 mm, for example, 0.2 mm. ing.

  Further, at least the lower end of the coil spring 111 is located in the lubricating oil 103.

  On the other hand, the coil spring 111 is press-fitted into the compressor-side snubber bar 125, and in particular, the ineffective winding portion 115 at the end of the coil spring 111 is press-fitted into the coil spring 111.

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

  When the electric element 105 is energized from an external power source, the shaft 121 rotates, and accordingly, the piston 123 reciprocates in the compression chamber 117, and the compression element 107 performs a predetermined compression operation.

  When the pressure in the compression chamber 117 decreases during the suction stroke, the pressure in the sealed container 101 decreases, and the refrigerant is guided into the sealed container 101 from the cooling system (not shown) and sucked into the compression chamber 117. The refrigerant sucked into the compression chamber 117 is compressed by the piston 123 and discharged again to a cooling system (not shown).

  At this time, since the piston 123 reciprocates, the electric compression element 109 vibrates in the reciprocating direction of the piston 123 due to the inertial force of the piston 123. In addition, vibration is also generated by sliding between the shaft 121 and the cylinder 119 or sliding between the piston 123 and the compression chamber 117.

  These vibrations are transmitted from the compressor-side snubber bar 125 of the electric compression element 109 to the coil spring 111 and are transmitted to the sealed container 101 via the shell-side snubber bar 113, thereby generating noise as a hermetic compressor. It also causes an increase in vibration.

  Here, if the shell-side snubber bar 113 and the coil spring 111 are press-fitted and fitted, the vibration of the electric compression element 109 is transmitted directly to the shell-side snubber bar 113 via the coil spring 111, so that the sealed container 101 is greatly added. Shake.

  In this embodiment, since the coil spring 111 and the shell-side snubber bar 113 are loosely fitted, the vibration of the electric compression element 109 is not directly transmitted to the shell-side snubber bar 113 via the coil spring 111, so Vibration can be reduced.

  Therefore, the vibration generated in the electric compression element 109 is greatly attenuated while being transmitted to the sealed container 101, and a hermetic compressor with less vibration and noise can be realized.

  Further, by loosely fitting the shell-side snubber bar 113 and the coil spring 111, a gap can be provided in the radial direction between the shell-side snubber bar 113 and the coil spring 111. Therefore, even if the coil spring 111 is moved and displaced, the coil spring 111 remains in the shell. Direct contact with the side snubber bar 113 and rubbing against each other can be reduced.

  Therefore, it is possible to suppress the generation of rubbing noise and vibration generated between the shell-side snubber bar 113 and the coil spring 111, and to realize a hermetic compressor with low vibration and noise.

  Further, when the coil spring 111 is inserted into the shell-side snubber bar 113 in the assembly process of the hermetic compressor, the shell-side snubber bar 113 and the coil spring 111 are assembled in a loosely fitted state, so that the coil spring 111 is easily inserted into the shell-side snubber bar 113. Productivity.

  At this time, if it is only loosely fitted, the coil spring 111 is inserted into the shell-side snubber bar 113 in the assembly process before the compressor-side snubber 125 of the electric compression element 109 is inserted into the coil spring 111. When any impact is applied to the coil spring 111, the coil spring 111 may fall down or drop off.

  Further, when the compressor-side snubber bar 125 is inserted into the coil spring 111, the coil spring 111 may fall down or drop out in the same manner by contacting the coil spring 111.

  However, in the present embodiment, since the shell-side snubber bar 113 loosely fitted with the coil spring 111 is magnetized, the coil-side spring 111 until the compressor-side snubber bar 125 of the electric compression element 109 is inserted into the coil spring 111. Even when some impact is applied to the compressor-side snubber bar 125 or the compressor-side snubber bar 125 comes into contact with the coil spring 111, the state in which the coil spring 111 is inserted into the shell-side snubber bar 113 can be maintained by the magnetic force of the shell-side snubber bar 113.

  Therefore, it is possible to prevent the coil spring 111 from falling off or falling down from the shell-side snubber bar 113 in the assembly process, so that a hermetic compressor with good assemblability can be realized.

  Further, when the electric power supply to the electric element 105 is interrupted, the electric compression element 109 is displaced in the rotation direction of the shaft 121 by its inertial force, and is inserted into the compressor-side snubber bar 125 as the electric compression element 109 is displaced. The coil spring 111 is also displaced.

  At that time, the electric compression element 109 is displaced so that the coil spring 111 is temporarily removed from the electric compression element 109 or the sealed container 101, but the shell-side snubber bar 113 is magnetized and attracts the coil spring 111 with a magnetic force. Temporary disconnection of the coil spring 111 due to the displacement of the electric compression element 109 can be reduced.

  Accordingly, temporary disconnection of the coil spring 111 can be reduced, and the displacement force of the electric compression element 109 can be efficiently absorbed to suppress the displacement of the electric compression element 109. Can be suppressed.

  Further, since the lower end of the coil spring 111 is located in the lubricating oil 103 and the shell-side snubber bar 113 is also at least partially located in the lubricating oil 103, the magnetized shell-side snubber bar 113 floats in the lubricating oil 103. Impurities can be sucked and captured, and impure foreign substances can be prevented from being conveyed along with the lubricating oil 103 to the sliding portion or the like.

  Therefore, it is possible to prevent a decrease in efficiency such as an increase in sliding loss at the sliding portion due to impure foreign matters, or a decrease in reliability such as wear or locking of the sliding portion.

  In the present embodiment, the inner diameter of the coil spring 111 and the outer diameter of the shell-side snubber bar 113 are set to a basic dimension of 12 mm, and the diameter gap between the coil spring 111 and the shell-side snubber bar 113 is within a range of 0.01 to 0.5 mm ( For example, it is set to 0.2 mm.

  The effect of assembling the coil spring 111 and the shell-side snubber bar 113 in the loosely fitted state is as described above, but a problem occurs even if the loosely-fitted gap is too large.

  That is, if the gap between the compressor-side snubber bar 125 and the coil spring 111 is too large, the magnetic force of the shell-side snubber bar 113 magnetized to the inserted coil spring 111 cannot be sufficiently applied in the assembly process, and the coil spring However, the diameter gap between the coil spring 111 and the shell-side snubber bar 113 should be set within a range of 0.01 to 0.5 mm (for example, 0.2 mm). This can be prevented.

  Further, even if the coil spring 111 does not fall down, it is possible to prevent the arrangement position of the coil spring 111 from greatly deviating from the arrangement position of the compressor side snubber bar 125 of the electric compression element 109. Therefore, the compressor side snubber bar 125 can be prevented. Can be prevented when the compressor-side snubber bar 125 comes into contact with the end face of the coil spring 111 and cannot be inserted into the compressor-side snubber bar 125.

  In this embodiment, at least the lower end of the coil spring 111 is located in the lubricating oil 103, and the shell-side snubber bar 113 and the coil spring 111 are loosely fitted and have a gap in the radial direction.

  For this reason, the lubricating oil 103 enters between the radial gap between the shell-side snubber bar 113 and the coil spring 111 and between the lower end of the coil spring 111 and the shell-side snubber bar 113, thereby further rubbing between the shell-side snubber bar 113 and the coil spring 111. In addition to minimizing physical contact between the coil spring 111 and the shell-side snubber bar 113, the vibration transmission of the vibration of the electric compression element 109 during operation can be directly transmitted to the shell-side snubber bar 113. Therefore, vibration and noise can be further reduced.

  In the present embodiment, the compressor-side snubber bar 125 is made of a resin material and is press-fitted into the coil spring 111.

  When the coil spring 111 is press-fitted and fitted, there is a possibility that vibration and noise increase due to frictional noise with the compressor-side snubber bar 125 and insufficient attenuation of vibration transmission of the electric compression element 109, but the compressor-side snubber bar 125 resin-based material is used. By adopting it, vibrations are less likely to be transmitted compared to iron-based materials, and furthermore, resin materials such as polybutylene terephthalate have low surface energy and solid lubricity, so that they slide well with iron-based materials.

  Therefore, it is possible to prevent rubbing noise generated between the compressor-side snubber bar 125 and the coil spring 111 and to attenuate vibration transmission from the electric compression element 109.

  In addition to that, by press-fitting the compressor-side snubber bar 125 and the coil spring 111, the coil spring 111 can efficiently absorb the displacement force of the electric compression element 109, and the displacement of the electric compression element 109 can be suppressed. A hermetic compressor that does not generate abnormal noise can be realized.

  Further, in the present embodiment, the ineffective winding part 115 in which the spring is in close contact is provided at both ends of the coil spring 111, and the ineffective winding part 115 is press-fitted into the compressor-side snubber bar 125. The ineffective winding part 115 hardly functions as a spring and does not move even if the coil spring 111 is displaced.

  Therefore, the displacement or vibration of the coil spring 111 hardly rubs against the compressor side snubber bar 125 or the shell side snubber bar 113, and further suppresses the generation of rubbing noise between the coil spring 111 and the compressor side snubber bar 125 or the shell side snubber bar 113. Can do.

  In particular, since the ineffective winding portion 115 is press-fitted and inserted into the compressor-side snubber bar 125, a problem occurs when the movable portion of the coil spring 111 is press-fitted into the compressor-side snubber bar 125 and the shell-side snubber bar 113. The occurrence of friction between the coil spring 111 and the compressor-side snubber bar 125 or the shell-side snubber bar 113 can be suppressed by the displacement or vibration of the electric compression element 109, and the generation of the friction noise between the coil spring 111 and the compressor-side snubber 125 can be prevented. Further suppression can be achieved.

  The compressor side snubber bar 125 and the coil spring 111 are press-fitted and the shell side snubber bar 113 and the coil spring 111 are loosely fitted. Needless to say, the effect of insertion and the effect of loose fitting can be obtained.

  Further, even if the shell-side snubber bar 113 is made of a resin material, it is needless to say that vibrations are less likely to be transmitted than the iron-based material, and the same effect as described in the embodiment in which the compressor-side snubber bar 125 is a resin material can be obtained.

  As described above, the hermetic compressor according to the present invention can be applied to a hermetic compressor used in an air conditioner, a refrigerator-freezer, and the like because it is easy to assemble and can be provided with low noise.

1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention. The principal part expanded sectional view of the hermetic compressor in the embodiment Vertical section of a conventional hermetic compressor Main section enlarged sectional view of a conventional hermetic compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Airtight container 103 Lubricating oil 109 Electric compression element 111 Coil spring 113 Shell side snubber bar 115 Invalid winding part 125 Compressor side snubber bar

Claims (6)

  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 ends are inserted into a side snubber bar and a shell side snubber bar, which is a protrusion provided on the closed container side, and either the compressor side snubber bar or the shell side snubber bar is magnetized and loosely fitted with the coil spring. A hermetic compressor characterized by that.   The hermetic compressor according to claim 1, wherein a diameter gap between the coil spring and either the compressor-side snubber bar or the shell-side snubber bar that is loosely fitted to the coil spring is in the range of 0.01 to 0.5 mm. .   3. The hermetic compressor according to claim 1, wherein the shell-side snubber bar is magnetized and at least the lower end of the coil spring is located in the lubricating oil.   The hermetic compressor according to any one of claims 1 to 3, wherein either the compressor-side snubber bar or the shell-side snubber bar is formed of a resin material and a coil spring is press-fitted into the compressor.   The hermetic compressor according to any one of claims 1 to 4, further comprising invalid winding portions at both ends of the coil spring.   The hermetic compressor according to claim 5, wherein an ineffective winding portion of a coil spring is press-fitted into the snubber bar.