JP2011047343A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetic compressor including a partition wall seal film attached to a passage cover, and suppressing such a phenomenon that an oil discharge is increased by preventing the short-circuiting of a refrigerant containing oil from a clearance relative to the insulator of an electric motor. <P>SOLUTION: The end of the partition wall seal film 52 is formed with an inwardly folded portion 52a, the insulator 3c of the electric motor 3 is brought into contact with the folded portion 52a of the partition wall seal film 52, the clearance between the insulator 3c of the electric motor and the partition wall seal film 52 is eliminated, and the short-circuiting of the refrigerant containing oil is prevented, thereby reducing the oil discharge. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an oil discharge amount reduction of a hermetic compressor used for an air conditioner, a refrigerator, or the like.

  The flow of refrigerant gas and the method of oil separation of a conventional hermetic compressor will be described with reference to the drawings.

  FIG. 3 shows a longitudinal sectional view of a conventional hermetic compressor described in Patent Document 1. In FIG. A compression mechanism 2 in the hermetic container 1, an electric motor 3 for driving the compression mechanism 2 provided below the compression mechanism 2, and a crankshaft 4 for transmitting the rotational force of the electric motor 3 to the compression mechanism 2 And an oil supply mechanism 7 for supplying the oil 6 of the oil reservoir 20 provided at the lower part in the sealed container 1 to the bearing portion 66 of the crankshaft 4 and the sliding portion of the compression mechanism 2 through the crankshaft 4.

  The oil 6 is forcedly supplied to the bearing 66 and the sliding portion of the compression mechanism 2 against the gravity by the oil supply mechanism 7, and the refrigerant gas compressed by the compression mechanism 2 is supplied to the electric motor in the sealed container 1 while ensuring a smooth operation. The electric motor 3 is cooled through the portion 3 and then discharged to the outside of the sealed container 1.

  As a result, the oil after being supplied to the bearing portion 66 and the sliding portion of the compression mechanism 2 can be moved downward by the supply pressure and gravity and can be naturally recovered in the oil reservoir 20.

  However, the refrigerant gas always comes in contact with oil and entrains it, bringing in oil when it is supplied from the sealed container to the refrigeration cycle, and pipe pressure loss in the refrigeration cycle and heat from condensers, evaporators, etc. There was a problem that caused a reduction in heat exchange efficiency in the exchanger.

  To solve this problem, the refrigerant gas discharged from the compression mechanism into the sealed container passes through the electric motor and cools the electric motor until it is discharged outside the sealed container. Some have been designed so that the centrifugal separation is repeated, so that the oil does not accompany the refrigerant gas discharged out of the sealed container.

  Specifically, the passage is such that the refrigerant gas discharged from the compression mechanism 2 continues from the in-container discharge chamber 31 above the compression mechanism to the lower portion of the compression mechanism 2 to the compression mechanism communication passage 32 and the rotor upper chamber 33. The stator 3a or the stator 3a is arranged so as to reach the lower part of the motor through the communication path 34, the rotor upper chamber 33 and the rotor lower chamber 35, which are surrounded by a cover, and to communicate with the lower part and the upper part of the stator 3a. After passing through the stator passage 37 provided between the container 1 and the sealed container 1 and passing through the stator upper chamber 38 around the outside of the communication path 34, the sealed container 1 is provided at a portion above the position of the stator upper chamber 38. An in-container refrigerant gas passage is provided through the external discharge hole 39 to be discharged out of the sealed container 1 (see, for example, Patent Document 1).

JP 2001-280252 A

In the prior art, the design philosophy is to perform gas-liquid separation of gas and oil by effectively constraining gas using a communication path from a compression mechanism, a rotor and a stator of an electric motor.

  However, depending on the dimensions around the motor, there are cases where the gas is not always sufficiently restrained.

  For example, if the gap between the coil end at the upper part of the stator and the communication path cover for guiding the refrigerant gas to the upper part of the rotor becomes large due to assembly variation or the like, the refrigerant gas from the gap causes a short circuit of the refrigerant gas. There has been a problem that the gas-liquid separation effect is reduced due to a decrease in gas restraint and induction ability.

  Also, in an electric motor in which an insulator is mounted on the upper part of the stator, if the gap between the insulator and the communication path cover becomes large due to assembly variation or the like, the refrigerant gas in the upper part of the rotor is similarly caused by a short circuit of the refrigerant gas from the gap. There is a problem in that the gas-liquid separation effect is reduced due to a decrease in the restraint and guidance ability.

  For this reason, this problem has been solved by adding a partition wall sealing film to extend the communication path cover and extending the tip of the communication path cover, or by narrowing the radial gap with the insulator.

  The present invention improves such a conventional effect. By bringing the folded portion of the partition wall seal film into contact with the electric motor insulator, the refrigerant can be prevented from being short-circuited, and the influence of long-term operation and heat can be suppressed. An object of the present invention is to provide a hermetic compressor capable of improving the liquid separation effect and suppressing the oil discharge amount to the outside of the compressor.

  In order to solve the above-mentioned problems, the present invention provides an inner folded portion at the tip of the partition seal film added to the passage cover, and brings the partition seal film folded portion into contact with the electric motor insulator.

  With the above configuration, the gap generated between the partition wall seal film and the electric motor insulator is prevented from becoming large due to heat or the like, and the gas-liquid separation effect is improved, thereby reducing oil discharge.

  The hermetic compressor of the present invention eliminates the gap between the partition wall seal film and the electric motor insulator, thereby suppressing the short circuit of the refrigerant gas containing a large amount of oil mist and improving the gas-liquid separation effect. Oil discharge can be suppressed.

1 is a longitudinal sectional view of a hermetic compressor according to an embodiment of the present invention. (A) The perspective view seen from diagonally downward of the partition seal member in one embodiment of the present invention (b) The side view (c) The perspective view seen from the diagonally upper side Vertical section of a conventional hermetic compressor

A first invention includes a compression mechanism in an airtight container, an electric motor with an insulator for driving the compression mechanism provided below the compression mechanism, and a crankshaft for transmitting the rotational force of the electric motor to the compression mechanism section And an oil supply mechanism that supplies oil in an oil reservoir provided at a lower portion in the sealed container to a bearing portion of the crankshaft and a sliding portion of the compression mechanism through the crankshaft, and the refrigerant gas discharged from the compression mechanism is A container discharge chamber in the upper part of the compression mechanism, a compression mechanism communication path for communicating the discharge chamber in the container and the lower part of the compression mechanism, a communication path surrounded by a communication path cover extending from the compression mechanism communication path to the rotor upper chamber, an upper part of the motor, Stator passage provided between the stator or the stator and the hermetic container so as to communicate with the lower part and the upper part of the stator and the lower part and the upper part of the stator. Through External discharge provided in a portion above the position of the stator upper chamber of the hermetic container through the stator upper chamber around the communication path, the compression mechanism or the compression mechanism ascending passage provided between the compression mechanism and the hermetic container. In the hermetic compressor which is discharged out of the hermetic container through the hole, a method is used in which the tip of the partition wall sealing film is brought into contact with the electric motor insulator in a shape folded back inside.

  By adopting such a configuration, a short circuit of the refrigerant gas containing a large amount of oil mist from between the partition wall seal film and the insulator is suppressed, and further, the oil accumulated in the folded portion is suppressed from flowing out. The oil can be prevented from being taken out.

  According to a second aspect of the present invention, by making the partition wall seal film a film of PET material, it is possible to suppress a short circuit of the refrigerant gas from the gap between the insulator and the passage cover, and to prevent oil from being taken out of the compressor. The seal film can be configured at a low cost.

  In the third aspect of the invention, particularly in the hermetic compressors of the first and second aspects of the invention, when the gas to be compressed is an alternative refrigerant that does not contain chlorine (for example, HFC refrigerant), the surface of the sliding portion is subjected to wear resistance. It is particularly necessary to keep oil in the sealed container because it does not form a ferrous iron chloride layer. However, according to the present invention, the oil discharge amount can be reduced outside the sealed container, so that the reliability of the sliding portion is ensured. be able to.

  According to a fourth invention, in the hermetic compressors of the first and second inventions, when the gas to be compressed is a natural refrigerant such as carbon dioxide, the gas discharged from the compressor needs to be at a high pressure. Since the load bearing capacity of the moving part is required to be large, it is particularly necessary to secure oil in the sealed container.However, according to the present invention, the amount of oil discharged to the outside of the sealed container can be reduced. Reliability can be ensured.

  According to the fifth aspect of the invention, various types of oil are used in the normal compressor depending on the refrigerant used and the material used for the compression mechanism section 2. The present invention relates to natural products or oils derived from natural products such as naphthenic oil, paraffin oil and alkylbenzene oil, which are mainly used in compressors, and synthetic oils such as polyether oils and polyol ester oils, or the above natural oils. It is also possible to apply to mixed oils of oils derived from products or natural products and synthetic oils.

  In the sixth aspect of the invention, various additives may be added to the oil in order to improve mechanical properties. The present invention comprises a copper deactivator such as benzotriazole, a sulfur-based extreme pressure additive, a halogen-based extreme pressure additive, a phosphorus-based extreme pressure additive, an organometallic compound-based extreme pressure additive, and combinations thereof. It can also be applied to a compressor containing an effective amount of an extreme pressure additive or the like.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the embodiments. Moreover, in each figure, about the same component, the same code | symbol is used and description is abbreviate | omitted.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a hermetic compressor (scroll-type hermetic compressor) according to an embodiment of the present invention, and FIG. 2A is a perspective view of the partition wall sealing member according to the embodiment of the present invention as viewed obliquely from below. FIG. 2B is a side view, and FIG. 3C is a perspective view as viewed obliquely from above.

  1 and 2, the hermetic compressor includes a compression mechanism 2 in a hermetic container 1, an electric motor 3 for driving the compression mechanism 2 provided below the compression mechanism 2, and the rotational force of the electric motor 3 as a compression mechanism 2. The oil 6 in the oil sump 20 provided at the lower part in the sealed container 1 is supplied to the bearing portion 66 of the crankshaft 4 and the sliding portion of the compression mechanism 2. The oil supply mechanism 7 is provided.

  As a result, the oil 6 is forcibly supplied to the bearing 66 and the sliding portion of the compression mechanism 2 against the gravity by the oil supply mechanism 7, and the refrigerant gas compressed by the compression mechanism 2 is sealed in a sealed container while ensuring smooth operation. After the motor 3 is cooled through the portion of the motor 3 in 1, the oil is discharged to the first floor of the sealed container, and the oil after being supplied to the sliding portion of the bearing 66 and the compression mechanism 2 is caused by supply pressure and gravity. It can move downward and be naturally recovered in the oil sump 20.

  However, actually, the refrigerant gas discharged from the compression mechanism 2 is accompanied by the oil 6 that has come into contact with the compression mechanism 2, or the supplied oil 6 dripping below the main bearing member 11 is scattered. In order to prevent this, there is a problem that the oil is discharged together with the refrigerant gas discharged to the outside of the hermetic container 1 and cannot be separated sufficiently. Yes.

  Refrigerant gas discharged from the compression mechanism 2 communicates with the in-container discharge chamber 31 at the top of the compression mechanism 2, the compression mechanism communication path 32 that connects the in-container discharge chamber 31 and the bottom of the compression mechanism 2, and the compression mechanism communication path 32. To the rotor upper chamber 33, the rotor passage 36 provided in the rotor 3b so that the rotor upper chamber 33 and the rotor lower chamber 35 communicate with each other, and the motor gap between the stator 3a and the rotor 3b. 80, the rotor lower chamber 35, and the lower part of the stator 3a. The stator 3a or the stator 3a and the hermetic container 1 are provided so that the lower part and the upper part of the stator 3a communicate with each other. After passing through the stator passage 37 to the stator upper chamber 38 around the outside of the communication path 34, the sealed container 1 is sealed through an external discharge port 39 provided in a portion of the sealed container 1 beyond the position of the stator upper chamber 38. It is discharged out of the container 1 It is provided with a container inside the gas passage to.

  The in-container discharge chamber 31 of the in-container gas passage and the compression mechanism communication passage 32 are located outside the compression mechanism 2 and its bearing portion 66, and collectively collect the refrigerant gas discharged from the compression mechanism 2. Then, it is discharged to the communication path 34 below the compression mechanism 2. Subsequently, the communication path 34 guides the discharged refrigerant gas to the rotor upper chamber 33 and the stator upper chamber 38.

  A part of the refrigerant gas induced as described above enters the rotor passage 36 in a state of being swirled loosely due to the rotation of the rotor 3b, passes through it, and passes to the separation plate 61 that separates the oil 6. Colliding strongly and effectively separating the accompanying oil 6, and making the mist of the oil 6 into droplets and growing, on the circumference of the space between the separation plate 61 and the lower end of the rotor 3 b Since at least a part of the opening is laterally opened, the centrifugal separation action works and the oil 6 separation effect is enhanced.

  The remaining refrigerant gas flows from the narrow space between the outer wall of the refrigerant gas guide cup 82 and the inner wall of the passage cover 51 to the rotor lower space 35 through the motor gap 80, and the partition seal film 52 attached to the outer wall of the passage cover 51. And that which flows into the stator upper chamber 38 through the gap between the inner walls of the insulator 3c of the stator 3a.

  By bringing the partition wall sealing film folded portion 52a into contact with the electric motor insulator 3c, the refrigerant gas that contains a large amount of oil mist does not flow easily, and the oil accumulated in the partition wall sealing film folded portion 52a flows out again from the gap. By suppressing this, the refrigerant gas sufficiently separated from the oil 6 and introduced into the motor lower space passes through the stator passage 37 and further passes through the stator passage 37 around the bearing portion 66 and further around the stator upper chamber 38 on the outer periphery. Can be discharged to the outside of the sealed container 1 through the compression mechanism ascending passage 43 provided in the compression mechanism 2 from the external discharge port 39 in a portion of the sealed container 1 at a position higher than the position of the stator upper chamber 38. Suppressing oil take-out to the outside can reduce pipe pressure loss in the refrigeration cycle and heat exchange effects in heat exchangers such as condensers and evaporators It is possible to prevent a decrease in.

  As described above, the hermetic compressor according to the present invention improves the sealing performance by bringing the partition wall seal film into contact with the insulator in the axial direction and suppresses a short circuit of the refrigerant gas containing a large amount of oil mist. A hermetic compressor that can control the amount of oil discharged to the outside of the machine can be realized, and a compressor for an air conditioner and a heat pump type hot water heater using natural refrigerants such as HFC refrigerant, HCFC refrigerant, and carbon dioxide. It can be applied to machine applications.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism 3 Electric motor 3a Stator 3b Rotor 3c Insulator 4 Crankshaft 6 Oil 7 Oil supply mechanism 20 Oil sump 31 Discharge chamber in container 32 Compression mechanism communication path 33 Rotor upper chamber 34 Connection path 35 Rotor lower chamber 36 Rotor passage 37 Stator passage 38 Stator upper chamber 39 External discharge port 42 Compression mechanism upper chamber 43 Compression mechanism ascending passage 51 Passage cover 52 Bulkhead seal film 52a Bulkhead seal film folding portion

Claims (6)

A compression mechanism in the sealed container, an electric motor for driving the compression mechanism provided below the compression mechanism, a crankshaft for transmitting the rotational force of the electric motor to the compression mechanism, and a lower part in the sealed container And an oil supply mechanism in which oil in the oil reservoir provided is supplied to the bearing portion of the crankshaft and the sliding portion of the compression mechanism through the crankshaft, and the refrigerant gas discharged from the compression mechanism is a discharge chamber in the container above the compression mechanism , A compression mechanism communication passage for communicating the discharge chamber in the container and the lower portion of the compression mechanism, a communication passage surrounded by a passage cover extending from the compression mechanism communication passage to the upper portion of the rotor, a passage communicating the upper and lower portions of the motor, Passing through the lower part of the stator, the lower part and the upper part of the stator are communicated with each other through the stator or between the stator and the sealed container so that the lower part and the upper part of the stator communicate with each other. Child In the hermetic compressor provided with the refrigerant gas passage in the container that is discharged out of the sealed container through an external discharge hole provided between the chamber, the compression mechanism or the compressed mechanism and the sealed container, the passage cover A partition wall seal film is provided between the passage cover and the motor insulator so that the refrigerant does not deviate from the channel between the communication path surrounded by the passage and the upper and lower passages of the motor. Has a folded part to the inside, and the partition seal film folded part is in contact with the electric motor insulator. 2. The hermetic compressor having a passage cover according to claim 1, wherein the passage cover partition seal film portion is a PET material film. 3. The hermetic compressor according to claim 1, wherein HCFC, HFC or the like not containing chlorine is used as a refrigerant. 3. The hermetic compressor according to claim 1, wherein a natural refrigerant such as carbon dioxide, ammonia or helium is used as a refrigerant. Natural products such as naphthenic oil, paraffin oil, and alkylbenzene oil, or oils derived from natural products, and synthetic oils such as polyether oils and polyol ester oils, or mixed oils of the above natural products or natural product-derived oils and synthetic oils The hermetic compressor according to claim 1 or 2, wherein The oil comprises a copper deactivator such as benzotriazole, a sulfur-based extreme pressure additive, a halogen-based extreme pressure additive, a phosphorus-based extreme pressure additive, an organometallic compound-based extreme pressure additive, and combinations thereof. The hermetic compressor according to claim 1 or 2, wherein an effective amount of other known additives such as an extreme pressure additive is blended.