JP2011064067A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetic compressor which contains a passage cover and bulkhead seal film to prevent a short circuit of a refrigerant containing oil from a gap between an electric motor insulator and the passage cover, and to suppress the phenomenon that an oil discharge amount is increased. <P>SOLUTION: A bulkhead seal film 52 is mounted on an electric motor insulator 3c and brought into contact with the inside of a passage cover 51 so that a gap to be generated between the electric motor insulator 3c and the bulk head seal film 52 is eliminated to situate the bulkhead seal film 52 inside the passage cover 51. Thus, the gap is situated in a direction opposite to a flow of a refrigerant gas containing oil from the lower part. As a result, a gas-liquid separation effect is enhanced to reduce an oil discharge amount. <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.

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

  FIG. 2 is a longitudinal sectional view of a conventional hermetic compressor. 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.

  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 outside of the hermetic container 1, and the oil after being supplied to the sliding portion of the bearing portion 66 and the compression mechanism 2 is supplied by supply pressure or gravity. It can move downward and be naturally recovered in the oil sump 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 is a problem that causes a reduction in heat exchange efficiency in the exchanger.

  In order to solve this problem, conventionally, 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 to the outside of the sealed container. In addition, the engine is designed so that centrifugal separation repeatedly occurs, so that oil does not accompany the refrigerant gas discharged outside the sealed container, or the refrigerant gas discharged from the compression mechanism 2 is discharged into the container above the compression mechanism. Chamber 31, compression mechanism communication path 32 communicating from the discharge chamber 31 in the container to the lower part of the compression mechanism 2, communication path 34 surrounded by a path cover so as to continue from the compression mechanism communication path 32 to the rotor upper chamber 33, It is provided between the stator 3a or the stator 3a and the hermetic container 1 so as to pass through the rotor upper chamber 33 and the rotor lower chamber 35 to reach the lower side of the electric motor, and to further communicate the lower portion and the upper portion of the stator 3a. After passing through the formed stator passage 37 to the stator upper chamber 38 around the outside of the communication passage 34, it is sealed through an external discharge hole 39 provided in a portion of the hermetic container 1 beyond the position of the stator upper chamber 38. For example, an in-container refrigerant gas passage is provided to be discharged out of the 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 on the upper part of the stator and the passage 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 in the upper part of the rotor is 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.

  In addition, even in an electric motor in which an insulator is mounted on the stator, if the gap between the insulator and the passage 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 has been a problem that the gas-liquid separation effect is reduced due to a decrease in restraint and guidance ability.

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

  The present invention improves such a conventional effect, prevents a short circuit of the refrigerant, suppresses the influence of long-term operation and heat, improves the gas-liquid separation effect, and reduces the oil discharge amount outside the compressor. It aims at providing the hermetic compressor which can be controlled.

  In order to improve the above-described solution, the present invention adds a partition seal film to the insulator, and contacts the inside of the passage cover with the partition seal film.

  By adopting the above configuration, there is no gap generated between the partition seal film and the motor insulator, and the partition seal film is present inside the passage cover so that the refrigerant gas containing oil from below flows in the opposite direction. The presence of the gap improves the gas-liquid separation effect, thereby reducing oil discharge.

  The hermetic compressor of the present invention eliminates the gap between the partition wall seal film and the motor insulator, suppresses a short circuit of the refrigerant gas containing a large amount of oil mist, and improves the gas-liquid separation effect, so that the oil to the outside of the compressor Discharge can be suppressed.

The longitudinal cross-sectional view and principal part enlarged view of the hermetic compressor which show Embodiment 1 of this invention Vertical section of a conventional hermetic compressor The figure which shows the contact situation of a passage cover and a partition seal film

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 in a lower portion in the sealed container to a bearing portion of the crankshaft and a sliding portion of the compression mechanism portion through the crankshaft, and the refrigerant gas discharged from the compression mechanism is Discharge chamber in the container above the compression mechanism, a compression mechanism communication path that connects the discharge chamber in the container and the lower part of the compression mechanism, a communication path surrounded by a passage cover extending from the compression mechanism communication path to the rotor upper chamber, the upper part of the motor Stator 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 through the passage that communicates with the lower part, the rotor lower chamber, and the lower part of the stator. aisle Through the stator upper chamber around the outside of the communication passage, the compression mechanism or the compression mechanism ascending passage provided between the compression mechanism and the hermetic container, and provided at a portion above the position of the stator upper chamber of the hermetic container In a hermetic compressor provided with an in-container refrigerant gas passage that is discharged out of the hermetic container through an external discharge hole, a partition seal film is provided on the motor insulator, and the partition seal film contacts the inside of the passage cover This is a hermetic type compressor having a configuration to

  By adopting such a configuration, the 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 partition wall seal film is placed inside the passage cover so as to include oil from below. However, since the gap exists in the direction opposite to the flow of the refrigerant gas, oil can be prevented from being taken out of the compressor.

  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 sealing film can be constructed 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. It is something that can be done.

  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.

  In 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. 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 can also be applied to oils derived from natural 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. The present invention is also 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 according to an embodiment of the present invention. In FIG. 1, a compression mechanism 2 in an airtight container 1, an electric motor 3 for driving the compression mechanism 2 provided below the compression mechanism 2, and a crank for transmitting the rotational force of the electric motor 3 to the compression mechanism 2. And an oil supply mechanism 7 in which oil 6 of an oil sump 20 provided at a lower portion in the hermetic container 1 is supplied to a bearing portion 66 of the crankshaft 4 and a sliding portion of the compression mechanism 2 through the crankshaft 4. I have.

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 is attached to the insulator inner walls of the passage cover 51 and the stator 3a. It is divided into those that flow to the stator upper chamber 38 through the gap between the partition wall seal films 52 formed.

  By bringing the partition wall seal film 52 into contact with the inside of the passage cover 51, it becomes difficult for the refrigerant gas that contains a large amount of oil mist to flow, and the refrigerant gas that is sufficiently separated from the oil 6 and led to the motor lower space is The stator passage 37 passes through the stator passage 37 and reaches the stator upper chamber 38 further outside of the communication path 34 around the bearing portion 66, and is fixed to the hermetic container 1 through the compression mechanism ascending passage 43 provided in the compression mechanism 2. Pipe pressure loss, condenser, and evaporator in the refrigeration cycle can be discharged out of the closed container 1 from the external discharge port 39 at a position higher than the position of the child upper chamber 38 and oil can be prevented from being taken out of the compressor. Thus, it is possible to prevent a decrease in heat exchange efficiency in the heat exchanger.

  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 inside of the passage cover and suppresses the 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. A compressor for an air conditioner and a heat pump type hot water heater using HFC refrigerant, HCFC refrigerant, and natural refrigerant 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 a 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

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 portion through the crankshaft, and refrigerant gas discharged from the compression mechanism is discharged into the container above the compression mechanism. A chamber, a compression mechanism communication passage 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 electric motor, The rotor passes through the rotor lower chamber, and then reaches the lower part of the motor. Further, the stator passes between the stator and the stator and the sealed container so that the lower part and the upper part of the stator communicate with each other. stator In the hermetic compressor provided with a refrigerant gas passage in a container that is discharged outside 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 seal film is provided between the passage cover and the motor insulator so that the refrigerant does not deviate from the flow path between the communication passage surrounded by the passage and the passage connecting the upper portion and the lower portion of the motor. A hermetic compressor in which a film is attached to the electric motor insulator and the partition wall seal film is in contact with the inside of the passage cover. 2. The hermetic compressor having a partition seal film according to claim 1, wherein the passage cover partition seal film portion is a film made of PET material. 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 An oil consisting of 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 a combination thereof. The hermetic compressor according to claim 1 or 2, wherein an effective amount of other known additives such as a pressure additive is blended.