JP2010121501A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetic compressor inhibiting a phenomenon that deformation during insertion is biased due to existence of a resin joint part of a bulkhead seal film, a gap during assembly becomes large, short of refrigerant containing oil occurs, and oil delivery quantity increases, in a structure having the bulkhead seal film attached to a passage cover, and fixing the passage cover by inserting a projection of the passage cover into a hole of the bulkhead seal film. <P>SOLUTION: Relative position of the hole and a resin joint part of the bulkhead seal film is not arranged at roughly 180°. Consequently, bias of deformation generated during insertion is kept small and gap during assembly is kept small. <P>COPYRIGHT: (C)2010,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. 3 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 lubricated to the bearing portion 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 supplied to the bearing portion 66 and the sliding portion of the compression mechanism 2 is supplied by the supply pressure and gravity. It can move downward and be naturally recovered in the oil sump 20.

  However, the refrigerant gas always comes in contact with the oil and entrains it, bringing in the oil when it is supplied from the closed container to the refrigeration cycle, causing pipe pressure loss in the refrigeration cycle, heat from the condenser, evaporator, 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, it is designed so that the centrifugal separation repeatedly occurs, so that the oil does not accompany the refrigerant gas discharged outside the sealed container.

In addition, the refrigerant gas discharged from the compression mechanism 2 communicates with the discharge chamber 31 in the container above the compression mechanism, the compression mechanism communication path 32 that communicates from the discharge chamber 31 in the container to the lower portion of the compression mechanism 2, and the compression mechanism communication path 32. To the rotor upper chamber 33, the communication passage 34 surrounded by the passage cover, the rotor upper chamber 33 and the rotor lower chamber 35 are sequentially passed to the lower side of the motor, and further, the lower and upper portions of the stator 3a are connected to each other. After passing through the stator 3a or the stator passage 37 provided between the stator 3a and the hermetic container 1 so as to communicate with the stator 3a, the stator of the hermetic container 1 is passed through the stator upper chamber 38 around the communication path 34. An in-container refrigerant gas passage is provided to be discharged out of the sealed container 1 through an external discharge hole 39 provided in a portion above the position of the upper chamber 38 (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 increases due to assembly variation, 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.

  Therefore, this problem has been solved by adding a partition seal film to extend the communication path cover and extending the tip of the communication path cover, or by adding a partition seal film and narrowing the gap with the insulator. .

  However, the addition of the partition wall seal film has a problem that the shape of the partition wall seal film is deformed due to interference with an insulator or the like. This is done by inserting a protrusion provided on the passage cover into the hole provided in the partition wall seal film, but the partition wall seal film is welded to form a ring by welding one plate shape at the end. This is due to the thickness of the overlapping portion that sometimes occurs, and the radial gap is concentrated in one direction by spreading when the communication path cover protrusion is inserted into the hole provided opposite to the overlapping portion. .

  The present invention solves such a conventional problem, and by improving the assembly of the insulator and the communication path cover, the gap between the insulator and the path cover can be further reduced, and contains a lot of oil mist. An object of the present invention is to provide a hermetic compressor capable of suppressing the short circuit of the refrigerant gas and the amount of oil discharged to the outside of the compressor.

  In order to solve the above-described problems, the present invention prevents the relative positions of the holes of the partition wall seal film to be added to the passage cover and the film bonding portion from being arranged at approximately 180 °.

  With the above-described configuration, oil discharge is reduced by suppressing an increase in the gap generated when the passage cover and the partition seal film are assembled.

  The hermetic compressor of the present invention can reduce the gap between the insulator cover and the communication path cover by reducing the gap between the passage cover and the partition seal film added thereto, and the refrigerant gas containing a large amount of oil mist. Short circuit can be suppressed and oil discharge to the outside of the compressor can be suppressed.

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 compression mechanism portion sliding portion through the crankshaft, and refrigerant gas discharged from the compression mechanism is A 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 communication path cover extending from the compression mechanism communication path to the rotor upper chamber, A fixed passage provided between the stator or the stator and the hermetic container so that the passage through the upper part and the lower part, the rotor lower chamber, and the lower part of the stator are communicated with each other. Provided in a portion above the position of the stator upper chamber of the sealed container through the passage through the stator upper chamber around the outside of the communication path, the compression mechanism or the compression mechanism ascending passage provided between the compression mechanism and the sealed container. In the hermetic compressor provided with the refrigerant gas passage in the container to be discharged out of the hermetic container through the external discharge hole thus formed, the projection of the passage cover and the hole of the partition wall seal film are fitted and assembled, The partition seal film has a partition seal film in which the relative position between the hole of the partition seal film and the welded portion of the resin portion is not arranged at approximately 180 °.

  By adopting such a configuration, the gap between the passage cover and the partition seal film is not biased, and the ease of assembly is improved, so that the gap between the insulator and the passage cover can be reduced, and the seal is improved and contains a lot of oil mist. The short circuit of the refrigerant gas can be suppressed, and the 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 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 secure oil in the sealed container because it does not form a ferrous 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 it is necessary to have a large load bearing capacity of the moving part, it is particularly necessary to secure oil in the sealed container, but 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 such as naphthenic oils, paraffin oils, and alkylbenzene oils that are mainly used in compressors, or oils derived from natural products, 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 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. FIG. 2A is a perspective view of a passage cover, and FIG. 2B is a perspective view of a partition seal film.

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 monk portion of the compression mechanism 2 through the crankshaft 4.

  As a result, the oil 6 is forcibly lubricated to the bearing portion 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 supplied to the bearing portion 66 and the sliding portion of the compression mechanism 2 is supplied by the 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 The is provided a container in the gas path A 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 making the position of the welded portion 52a of the partition wall seal film 52 and the hole 52b provided in the partition wall seal film asymmetric, the gap allowed at the time of assembly is reduced, and the gap between the partition wall seal film 52 and the insulator 3c is reduced. The refrigerant gas that contains a large amount of mist becomes difficult to flow, and the refrigerant gas that has been sufficiently separated from the oil 6 and led to the lower space of the motor passes through the stator passage 37 and is a communication path around the bearing portion 66. 34, reaches the outer stator upper chamber 38, passes through a compression mechanism ascending passage 43 provided in the compression mechanism 2, and passes through an external discharge port 39 in a portion of the hermetic container 1 beyond the position of the stator upper chamber 38. Pipe pressure loss and condenser in the refrigeration cycle can be discharged out of the airtight container 1 and the oil can be taken out of the compressor. It is possible to prevent a decrease in heat exchange efficiency of the heat exchanger, such as Hatsuki.

  As described above, the hermetic compressor according to the present invention reduces the gap between the passage cover and the partition seal film added thereto, thereby reducing the gap between the insulator and the partition seal film portion added to the passage cover. Therefore, it is possible to realize a hermetic compressor that can improve the sealing performance and suppress the short circuit of the refrigerant gas containing a large amount of oil mist, thereby suppressing the amount of oil discharged to the outside of the compressor. It can be applied to applications such as a compressor for an air conditioner and a compressor for a heat pump type hot water heater using a refrigerant and a carbon dioxide refrigerant.

Sectional drawing of the closed type compressor in Embodiment 1 of this invention (A) The perspective view of the channel | path cover in Embodiment 1 of this invention (b) The perspective view of the partition seal film Cross section of a conventional hermetic compressor

Explanation of symbols

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 rising passage 51 Passage cover 52 Partition seal film 52a Partition seal film welded portion 52b Partition seal film hole

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 that supplies oil in the oil reservoir provided 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. In the hermetic compressor having an upper chamber, a compression mechanism, or an in-container refrigerant gas passage that is discharged outside the sealed container through an external discharge hole provided between the compression mechanism and the sealed container, the passage The relative position between the hole provided in the resin part and the welded part of the resin part of the passage cover constructed by assembling the cover with the metal part with protrusions and the partition seal film part with holes is approximately 180 °. Hermetic compressor not placed in 2. The hermetic compressor according to claim 1, wherein the passage cover partition wall 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 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.