JP2012036749A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of a possibility that in a hermetic compressor, a circulation amount of refrigerant gas is decreased by the heating of the refrigerant gas when passing through a suction route to a compression chamber or by the leakage of the refrigerant gas of a high temperature and high pressure into the suction route.SOLUTION: A suction route 17 is constituted of a suction pipe 56 and an inner pipe 57 and the suction pipe 56 is supported by disposing a sealing member 59 in the structural component 10 of a compression mechanism unit 2, and thus, the heating of the refrigerant gas during suction can be suppressed and a sealing property in a suction unit can be secured. Accordingly, there is provided the hermetic compressor having high volume efficiency.

Description

  The present invention relates to a hermetic compressor used in a cooling apparatus such as an air conditioning / air conditioning apparatus or a refrigerator, or a heat pump type hot water supply apparatus.

  Conventionally, a hermetic compressor used for an air conditioner, a cooling device or the like generally includes a compression mechanism and a motor in a sealed container, and compresses the refrigerant gas returned from the refrigeration cycle by the compression mechanism. It plays the role of feeding into the refrigeration cycle. The compression mechanism section is provided with a compression chamber for compressing the refrigerant gas and a suction path for supplying the refrigerant gas to the compression chamber. The refrigerant gas that has been compressed and brought into a high-temperature and high-pressure state is discharged from the compression mechanism into the sealed container, and is sent to the refrigeration cycle from a discharge pipe provided in the sealed container.

  The refrigerant gas returned from the refrigeration cycle is in a low temperature state, but receives heat in the process of being sent to the compression chamber through the suction path. For this reason, when the refrigerant gas actually enters the compression chamber, the refrigerant gas expands, causing a reduction in the circulation amount. As a countermeasure against this, there is a method in which a double pipe member is provided in the suction path to suppress heat transfer to the refrigerant gas (for example, see Patent Document 1).

  FIG. 5 is a longitudinal sectional view of a conventional compressor described in Patent Document 1. In FIG. The refrigerant gas is guided to the compression chamber 92 through the suction path 90 formed by the inner periphery of the suction pipe 91. An outer pipe 93 is provided on the outer periphery of the suction pipe 91, whereby a heat insulating layer 94 is formed between the suction pipe 91 and the outer pipe 93 as a suction refrigerant heat insulating means for heat insulating from the surrounding heat. . With the above configuration, ambient heat is prevented from being transferred to the refrigerant gas flowing through the suction pipe 91 and the inner peripheral portion.

JP 2008-169816 A

  However, in the conventional configuration, the outer pipe 93 is fixedly supported in a state where it is press-fitted with the one part 95 that constitutes the compression chamber 92, so the following two problems arise. First, the heat transfer from one component 95 constituting the compression chamber 92 to the outer tube 93 is large, and the heat transfer to the refrigerant gas via the heat insulating layer 94 is also large. As a result, the refrigerant gas expands, causing a reduction in the circulation rate. Second, when the outer tube 93 is fixedly supported by press fitting, there is a possibility that a gap may be formed in the press fitting portion due to temperature change of the compressor due to repeated operation and stop. As a result, the sealing performance of the press-fit portion is lowered, and the refrigerant gas existing outside the outer pipe 93 flows into the compression chamber 92, similarly causing a reduction in the circulation rate.

  The present invention solves the above-described conventional problems, and is configured such that a suction path is constituted by a suction pipe and an inner pipe, and a seal member is disposed on a part of the compression mechanism to support the suction pipe. As a result, it is possible to suppress the suction heating of the refrigerant gas and ensure the sealing performance at the suction portion, and to provide a hermetic compressor with high volumetric efficiency.

A hermetic compressor having a compression mechanism in a hermetic container and having a compression chamber for compressing refrigerant gas in the compression mechanism and a suction path for supplying the refrigerant gas to the compression chamber. The refrigerant gas is constituted by an inner pipe arranged on the inner peripheral part, passes through the inner peripheral part of the inner pipe and is supplied to the compression chamber, and the refrigerant formed in the gap formed between the outer peripheral part of the inner pipe and the suction pipe Gas is retained and a seal member is disposed in one part constituting the compression chamber, and the suction pipe is supported via the one part constituting the compression chamber and the seal member.

  According to such a configuration, it is possible to further reduce the heating of the refrigerant gas generated when passing through the suction path. Further, since the sealing property can be ensured against a long-term temperature change, it is possible to prevent the refrigerant gas from leaking from the outside. From the above, a hermetic compressor with high volumetric efficiency can be provided.

  In the hermetic compressor according to the present invention, when the suction path is configured by a suction pipe and an inner pipe, and further, a seal member is disposed in a part of the compression mechanism portion to support the suction pipe, thereby suppressing the suction heating of the refrigerant gas. At the same time, the sealing performance at the suction portion can be ensured, so that a hermetic compressor with high volumetric efficiency can be provided.

1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention. 1 is a cross-sectional view of a compression mechanism unit according to Embodiment 1 of the present invention. The principal part expanded sectional view of the compression mechanism part in Embodiment 1 of this invention The principal part expanded sectional view of the compression mechanism part in Embodiment 1 of this invention Longitudinal sectional view of a conventional scroll compressor

  In a first aspect of the present invention, there is provided a hermetic compressor including a compression mechanism in a sealed container, a compression chamber for compressing the refrigerant gas in the compression mechanism, and a suction path for supplying the refrigerant gas to the compression chamber. The suction path is composed of a suction pipe and an inner pipe disposed on the inner circumference thereof, and the refrigerant gas passes through the inner circumference of the inner pipe and is supplied to the compression chamber, and is formed between the outer circumference of the inner pipe and the suction pipe. The refrigerant gas is retained in the gap, and a seal member is disposed in one part constituting the compression chamber, and the suction pipe is supported via the one part constituting the compression chamber and the seal member. According to this configuration, it is possible to reduce heating of the refrigerant gas generated when passing through the suction path. Further, since the sealing property can be ensured against a long-term temperature change, it is possible to prevent the refrigerant gas from leaking from the outside. From the above, a hermetic compressor with high volumetric efficiency can be provided.

  In the second invention, the rear portion of the compressor is a scroll type compression mechanism portion configured by using a fixed scroll and a turning scroll, and the entry tube is supported by the fixed scroll via a seal member. According to this configuration, since the compression mechanism portion is arranged in the refrigerant gas atmosphere, the sealing effect is remarkably exhibited by the seal member, and a scroll-type compressor with high volume efficiency can be provided.

  In the third aspect of the invention, particularly in the first or second aspect of the invention, the outer peripheral surface area of the portion of the suction pipe that is located closer to the compression chamber than the seal member is located closer to the sealed container than the seal member, It is formed larger than the outer peripheral surface area of the portion in contact with the refrigerant gas or high-temperature oil. According to this configuration, by reducing the area where the suction pipe contacts the high-temperature refrigerant gas, the suction pipe itself is prevented from being heated, and heat transfer to the refrigerant gas existing in the inner periphery of the suction pipe is performed. Can be prevented.

  In the fourth aspect, particularly in the first to third inventions, the compression chamber side end surface of the inner pipe is disposed in the vicinity of the compression chamber side end surface of the suction pipe. According to this configuration, it is possible to effectively prevent the refrigerant gas from being sucked and heated by arranging the inner tube until just before the refrigerant gas is confined in the compression chamber.

  In 5th invention, especially the 1st-3rd invention WHEREIN: The anti-compression chamber side end surface of an inner pipe is arrange | positioned outside a sealed container. According to this configuration, it is possible to effectively prevent the refrigerant gas from being sucked and heated by disposing the inner pipe over the region where the high-temperature refrigerant gas is heating the suction pipe.

  In the sixth invention, particularly in the first to fifth inventions, the refrigerant gas is a high-pressure refrigerant, for example, carbon dioxide. In this case, since the temperature difference of the refrigerant gas is particularly large, the refrigerant gas is likely to be heated when passing through the suction path. Therefore, the effect of the configuration of the present invention is remarkably exhibited, and a hermetic compressor that realizes high efficiency can be provided.

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

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a hermetic compressor according to a first embodiment of the present invention. Here, the operation and action of a scroll type hermetic compressor will be described as an example.

  As shown in FIG. 1, the hermetic compressor of the present invention includes a hermetic container 1 and a compression mechanism unit 2 and a motor unit 3 inside thereof. An orbiting scroll 13 meshing with the fixed scroll 12 is interposed between the main bearing member 11 of the shaft 4 fixed by welding or shrink fitting in the sealed container 1 and the fixed scroll 12 bolted on the main bearing member 11. The scroll-type compression mechanism 2 is sandwiched. Between the orbiting scroll 13 and the main bearing member 11, there is provided a rotation restraining mechanism 14 such as an Oldham ring that guides the orbiting scroll 13 so as to prevent the rotation of the orbiting scroll so as to move in a circular orbit. The orbiting scroll 13 is moved in a circular orbit by driving the orbiting scroll 13 eccentrically by the portion 4a. By using the fact that the compression chamber 15 formed between the fixed scroll 12 and the orbiting scroll 13 moves while shrinking the volume from the outer peripheral side toward the center portion, the suction communicated outside the sealed container 1. The refrigerant gas is sucked through the pipe 16 and the suction passage 17 formed in the fixed scroll 12, and is compressed after being closed in the compression chamber 15. Refrigerant gas that has reached a predetermined pressure is discharged into the sealed container 1 by pushing the reed valve 19 through the discharge port 18 at the center of the fixed scroll 12.

  A pump 25 is provided at the lower end of the shaft 4 and is arranged so that a suction port of the pump 25 exists in the oil storage unit 20. Since the pump 25 is driven simultaneously with the scroll compressor, the pump 25 can reliably suck up the oil 6 in the oil storage unit 20 provided at the bottom of the hermetic container 1 regardless of the pressure condition and the operation speed. The worry of running out of oil is also eliminated. The oil 6 sucked up by the pump 25 is supplied to the compression mechanism portion 2 through an oil supply hole 26 running vertically through the shaft 4. If foreign matter is removed from the oil 6 with an oil filter or the like before or after the oil 6 is sucked up by the pump 25, foreign matter can be prevented from being mixed into the compression mechanism section 2 and further reliability can be improved.

  The pressure of the oil 6 guided to the compression mechanism unit 2 is substantially equal to the discharge pressure of the scroll compressor, and also serves as a back pressure source for the orbiting scroll 13. As a result, the orbiting scroll 13 does not move away from the fixed scroll 12 and does not come into contact with each other, and the predetermined compression function is stably exhibited. Further, a part of the oil 6 enters the bearing portion 5 between the shaft 4 and the main bearing member 11, the fitting portion between the eccentric shaft portion 4 a and the orbiting scroll 13 so as to obtain a clearance by the supply pressure and its own weight. Then, the respective parts are lubricated and then dropped and returned to the oil storage unit 20.

Another part of the oil 6 supplied to the high-pressure region 30 is formed in the orbiting scroll 13 and passes through a path 51 having one open end in the high-pressure region 30, and the back pressure where the rotation restraining mechanism 14 is located. Enter chamber 29. The oil 6 that has entered the back pressure chamber 29 plays a role of applying the back pressure of the orbiting scroll 13 in the back pressure chamber 29 in addition to lubricating the thrust sliding portion and the sliding portion of the rotation restraint mechanism 14.

  Here, the compression of the refrigerant gas will be described in detail. FIG. 2 is a cross-sectional view of the compression mechanism unit 2 in a state where the orbiting scroll 13 is engaged with the fixed scroll 12, and is a diagram showing a state where the phases are shifted by 90 degrees in the order of (I) to (IV). . Here, the compression chamber formed surrounded by the wrap outer wall of the orbiting scroll 13 and the wrap inner wall of the fixed scroll 12 is formed surrounded by the first compression chamber 15a, the wrap inner wall of the orbiting scroll 13 and the wrap outer wall of the fixed scroll 12. The compression chamber to be used is a second compression chamber 15b. (I) of FIG. 2 is a state at the moment when the first compression chamber 15a confines the refrigerant gas, and the compression chamber is assumed to be 15a-1. Thereafter, the first compression chamber 15a includes (II) 15a-2, (III) 15a-3, (IV) 15a-4, (I) 15a-5, (II) 15a-6, It moves to (III) 15a-7, and in (IV) 15a-8, it is discharged into the sealed container 1 through the discharge port 18 formed in the center of the fixed scroll 12.

  The refrigerant gas becomes a high temperature and high pressure state as the compression proceeds, and the refrigerant gas discharged by pushing the reed valve 19 through the discharge port 18 is guided to the surface side opposite to the wrap surface of the fixed scroll 12. That is, since the fixed scroll 12 is in contact with the refrigerant gas in a high temperature state, the temperature of the fixed scroll 12 during operation rises to a temperature close to the refrigerant gas discharge temperature.

  On the other hand, the refrigerant gas in a low temperature state is supplied from the suction path 17 formed on the outer peripheral portion of the fixed scroll 12 to the compression chamber 15, but is heated from the outside and expands when passing through the suction path 17. When heating and expansion occur in the process of confining the refrigerant gas in the compression chamber 15 as described above, the circulation rate decreases, leading to a decrease in volumetric efficiency and a decrease in compressor efficiency.

  Therefore, in the embodiment, the suction path 17 is configured by the suction pipe 56 and the inner pipe 57 disposed on the inner peripheral portion thereof, and the refrigerant gas passes through the inner peripheral portion of the inner pipe 57 and is supplied to the compression chamber 15. Further, the refrigerant gas is retained in the gap 58 formed between the outer peripheral portion of the inner pipe 57 and the suction pipe 56. Further, a seal member 59 is arranged on one component 10 (the fixed scroll 12 in the case of the scroll method) constituting the compression chamber 15, and the suction pipe 56 is supported by the seal member 59.

  FIG. 3 is an enlarged cross-sectional view of the compression mechanism unit 2. Since the sealed container 1 is filled with compressed high-temperature and high-pressure refrigerant gas, the component 10 (here, the fixed scroll 12) of the compression mechanism is in a high temperature state. For this reason, when the suction pipe 56 is press-fitted into the fixed scroll 12 and fixedly supported, heat is transferred from the fixed scroll 12 to the suction pipe 56 in a solid contact state. As a result, the suction pipe 56 becomes high temperature as a whole, and heat transfer to the inner peripheral portion of the suction pipe 56 is promoted. On the other hand, when the sealing member 59 is disposed on the fixed scroll 12 and the suction pipe 56 is supported by the sealing member 59, the fixed scroll 12 and the suction pipe 56 do not have a direct contact portion. Further, the suction pipe 56 located on the compression chamber 15 side from the seal member 59 has a lower temperature than the case of the fixed support by press-fitting because the low-temperature refrigerant gas goes around the outer periphery of the suction pipe 56. In the case of press-fitting and fixing, the low-temperature refrigerant gas passes through the inner peripheral portion of the suction pipe 56, while the fixed scroll 12 is in a high-temperature state. If it is repeated, there is a possibility that a gap is generated in the press-fitting portion. When such a gap is generated, the refrigerant gas existing outside the suction pipe 56 flows into the compression chamber 15 and causes a reduction in the circulation amount. On the other hand, when the sealing member 59 is disposed, a stable sealing performance can be ensured over a long period of time.

  Further, by arranging the inner pipe 57 on the inner peripheral portion of the suction pipe 56, the refrigerant gas stays in the gap 58 formed between the outer peripheral portion of the inner pipe 57 and the suction pipe 56, and a heat insulating layer is formed. . That is, in the present embodiment, from the fixed scroll 12 to the refrigerant gas passing through the suction path 17, the refrigerant gas region bordered by the fixed scroll 12 and the seal member 59, the suction pipe 56, and the gap 58 where the refrigerant gas has accumulated. The inner tube 57 is configured and arranged in this order. Thereby, the heating to the refrigerant gas passing through the inner peripheral portion of the inner pipe 57 can be greatly suppressed, and it becomes possible to provide a hermetic compressor with high volumetric efficiency.

  In the present embodiment, the scroll method has been described as an example, but the same effect can be obtained in, for example, a rotary method, a reciprocating method, and other hermetic compressors.

  Next, effects specific to the scroll method are described below. In a scroll-type hermetic compressor, generally, as shown in FIG. 1, a compression mechanism unit 2 is arranged in an upper part of a hermetic container 1, and a motor unit 3 is provided in a lower part. The component 10 corresponds to the fixed scroll 12. In such a configuration, the compression mechanism portion 2 is disposed in the refrigerant gas atmosphere, so that it is a contact portion between the suction pipe 56 and the fixed scroll 12 (in the conventional configuration, it is a press-fitting portion, and in the present embodiment, it is supported by the seal member. The refrigerant gas existing outside the suction pipe 56 is likely to leak into the compression chamber 15 via the part). Therefore, in the scroll system, the effect of the sealing performance by the seal member 59 appears more remarkably, and a scroll-type compressor with high volumetric efficiency can be provided.

  Further, by specifying the contact area between the refrigerant gas and the suction pipe 56, a further effect can be obtained. FIG. 4 is an enlarged cross-sectional view of the compression mechanism unit 2. As shown in FIG. 4, the outer peripheral surface area of the suction pipe 56 in the region that is located closer to the compression chamber 15 than the seal member 59 at the outer peripheral portion of the suction pipe 56 is in contact with the low-temperature refrigerant gas. Therefore, the surface area of the suction pipe 56 is set larger than the outer peripheral surface area of the suction pipe 56 in the region that is located closer to the sealed container 1 than the seal member 59 and is in contact with the high-temperature refrigerant gas or high-temperature oil. The suction pipe 56 has a part cooled by the low-temperature refrigerant gas and a part heated by the high-temperature refrigerant gas with the seal member 59 as a boundary, but reduces the area in contact with the high-temperature refrigerant gas. Thereby, the temperature rise of the suction pipe 56 can be suppressed. That is, heat transfer to the refrigerant gas existing in the inner peripheral portion of the suction pipe 56 can be prevented, and volume efficiency can be further improved.

  More preferably, the end surface 57o of the inner tube 57 on the compression chamber 15 side is disposed in the vicinity of the end surface 56o of the suction tube 56 on the compression chamber 15 side. That is, since the inner pipe 57 is disposed until just before the refrigerant gas is confined in the compression chamber 15, it is possible to effectively prevent the refrigerant gas from being sucked and heated.

  More preferably, the end surface 57i of the inner tube 57 on the side opposite to the compression chamber is disposed outside the sealed container 1. That is, since the inner pipe 57 is disposed over a region where the high-temperature refrigerant gas is heating the suction pipe 56, the suction and heating of the refrigerant gas can be effectively prevented.

  Finally, when the refrigerant gas is a high-pressure refrigerant, such as carbon dioxide, the temperature difference of the refrigerant gas is particularly large, so that the refrigerant gas is easily heated when passing through the suction path 17. Therefore, the effect of the configuration of the present invention is remarkably exhibited, and a hermetic compressor that realizes high efficiency can be provided.

As described above, in the hermetic compressor according to the present invention, the suction path is configured by the suction pipe and the inner pipe, and the refrigerant gas is provided by supporting the suction pipe by disposing the seal member in the compression mechanism part. In addition, it is possible to provide a hermetic compressor with high volumetric efficiency, since it is possible to secure the sealing performance at the suction portion while suppressing the suction heating. Furthermore, it is possible to make the product more comfortable and environmentally friendly as an air conditioner such as a room air conditioner or a heat pump water heater.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism part 3 Motor part 10 Component part of compression mechanism part 12 Fixed scroll 13 Orbiting scroll 14 Rotation restraint mechanism 15 Compression chamber 17 Suction path 18 Discharge port 56 Suction pipe 57 Inner pipe 58 Clearance 59 Seal member

Claims (6)

A hermetic compressor comprising a compression mechanism in a hermetic container, a compression chamber for compressing refrigerant gas in the compression mechanism, and a suction path for supplying refrigerant gas to the compression chamber;
The inhalation path is composed of an inhalation pipe and an inner pipe disposed on the inner periphery thereof,
The refrigerant gas passes through the inner periphery of the inner pipe and is supplied to the compression chamber,
While retaining a part of the refrigerant gas in the gap formed between the outer periphery of the inner pipe and the suction pipe,
The suction pipe is a hermetic compressor supported by the compressor via a seal member. The compressor rear part is a scroll-type compression mechanism part configured by using a fixed scroll and a turning scroll,
The hermetic compressor according to claim 1, wherein the entry tube is supported by the fixed scroll via the seal member. Of the suction pipe, the outer peripheral surface area of the portion located closer to the compression chamber than the seal member,
3. The hermetic compressor according to claim 1, wherein the hermetic compressor is formed to be larger than an outer peripheral surface area of a portion that is located closer to the hermetic container than the seal member and is in contact with a high-temperature refrigerant gas or high-temperature oil. 4. The hermetic compressor according to claim 1, wherein the compression chamber side end surface of the inner pipe is disposed in the vicinity of the compression chamber side end surface of the suction pipe. The hermetic compressor according to any one of claims 1 to 4, wherein an end surface of the inner pipe opposite to the compression chamber is disposed outside the hermetic container. The hermetic compressor according to any one of claims 1 to 5, wherein the refrigerant gas is a high-pressure refrigerant.