JP2019210867A - Compressor and manufacturing method of the same - Google Patents

Abstract

To simplify a structure and improve assemblability in a case where a gas injection pipe and a liquid injection pipe are installed.SOLUTION: A scroll compressor 1 includes: a block member 29 installed between a discharge cover 15 and a fixed scroll 18; and a gas injection pipe 25 in which one end is connected to the discharge cover 15 and a refrigerant gas to be introduced into a compression chamber 20 of a scroll compression mechanism 12 circulates. The block member 29 has: a refrigerant gas division passage 44 in which the refrigerant gas supplied from the gas injection pipe 25 is divided into multiple portions; and multiple refrigerant gas passages 32 which is formed penetrating from a first surface at the discharge cover 15 side to a second surface at the fixed scroll 18 side and in which the refrigerant gases divided in the refrigerant gas division passage 44 circulate. The fixed scroll 18 is formed with gas injection ports 26 which introduce the refrigerant gases that have passed through the refrigerant gas passages 32 into the compression chamber 20.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a compressor and a method for manufacturing the compressor.

  In recent years, a refrigerant having a low global warming potential (GWP) is used in a refrigeration cycle such as a refrigeration apparatus or an air conditioner, so that the temperature of the refrigerant gas discharged from the compressor (discharge gas temperature) tends to increase. . Some compressors used under high pressure ratio operation conditions such as a low-temperature refrigeration apparatus employ a liquid injection structure in which refrigerant liquid is injected during the compression stroke of the compressor in order to reduce the discharge gas temperature. .

  Patent Document 1 below discloses a technique in which a gas compressor hole and a liquid injection hole are provided in a scroll compressor, and the electric motor and the compression unit are appropriately cooled.

JP-A-3-145589

  In the scroll compressor, the compression chamber is formed symmetrically by meshing the fixed scroll and the orbiting scroll. Therefore, in the scroll compressor, in order to realize a stable operation, it is desirable that the gas injection hole and the liquid injection hole provided in the fixed scroll are also formed symmetrically. Therefore, in the configuration in which the gas injection pipe or the liquid injection pipe for introducing the refrigerant into the compression mechanism is directly connected to the fixed scroll, a structure for branching the gas injection pipe or the liquid injection pipe and then introducing the refrigerant into the compression mechanism is required. . Moreover, there is a problem that the number of pipes penetrating the hermetic container of the compressor is increased, the labor of processing the penetrating portion is increased, and the number of places where countermeasures for refrigerant leakage are taken.

  The present invention has been made in view of such circumstances, and a compressor and a compressor capable of improving assembly while simplifying the structure when a gas injection pipe and a liquid injection pipe are installed. It aims at providing the manufacturing method of.

In order to solve the above problems, the compressor and the method for manufacturing the compressor of the present invention employ the following means.
That is, the compressor according to the first aspect of the present invention includes a housing, a scroll-type compression mechanism housed in the housing and having a fixed scroll, and a refrigerant compressed by the compression mechanism and discharged from the fixed scroll. A discharge cover provided with a discharge port passing therethrough, a cover member installed between the discharge cover and the fixed scroll, and one end of which is connected to the discharge cover, and the refrigerant introduced into the compression chamber of the compression mechanism And the discharge cover or the cover member has a refrigerant distribution channel through which the refrigerant supplied from the injection pipe is distributed in plural, and the cover member is provided on the discharge cover side. Formed from the first surface to the second surface on the fixed scroll side, the front The fixed scroll has a plurality of refrigerant flow paths through which the refrigerant distributed in the refrigerant distribution flow path flows, and an injection port for introducing the refrigerant that has passed through the refrigerant flow path into the compression chamber is formed. Yes.

  According to this configuration, the refrigerant supplied from the injection pipe is distributed and supplied to the plurality of refrigerant channels formed in the cover member in the refrigerant distribution channel formed on the discharge cover side of the discharge cover or the cover member. Is done. By providing the refrigerant distribution channel in the cover member, the number of gas injection pipes that penetrate the housing can be reduced.

  A compressor according to a second aspect of the present invention includes a housing, a scroll-type compression mechanism housed in the housing and having a fixed scroll, and a refrigerant compressed by the compression mechanism and discharged from the fixed scroll. A discharge cover provided with a discharge port, a cover member installed between the discharge cover and the fixed scroll, and a refrigerant gas which is connected to the discharge cover at one end and is introduced into the compression chamber of the compression mechanism A gas injection pipe through which one end is connected to the cover member, and a liquid injection pipe through which a liquid refrigerant liquid introduced into the compression chamber flows, wherein the discharge cover or the cover member includes the gas injection Refrigerant gas distribution flow in which the refrigerant gas supplied from the pipe is distributed in plural The cover member is formed to penetrate from the first surface on the discharge cover side to the second surface on the fixed scroll side, and a plurality of the refrigerant gases distributed in the refrigerant gas distribution flow path flow therethrough A refrigerant gas flow path, and a refrigerant liquid flow path formed through the first surface and penetrating from the first surface to the second liquid surface, through which the refrigerant liquid supplied from the liquid injection pipe flows. Are formed with a gas injection port for introducing the refrigerant gas that has passed through the refrigerant gas flow path into the compression chamber, and a liquid injection port for introducing the refrigerant liquid that has passed through the refrigerant liquid flow path into the compression chamber. ing.

  According to this configuration, the refrigerant gas supplied from the gas injection pipe is distributed and supplied to the plurality of refrigerant gas channels formed in the cover member in the refrigerant gas distribution channel formed in the discharge cover or the cover member. Is done. Further, the refrigerant liquid supplied from the liquid injection pipe is supplied to the refrigerant liquid flow path formed in the cover member. By providing the refrigerant gas distribution channel in the cover member, the number of gas injection pipes penetrating the housing can be reduced.

  In the second aspect, the cover member is disposed on the second surface, and is disposed on the second surface, and a first check valve that prevents back flow of the refrigerant gas supplied from the refrigerant gas flow path. And a second check valve for preventing a back flow of the refrigerant liquid supplied from the refrigerant liquid flow path.

  In the second aspect, the apparatus further comprises a discharge chamber formed between the housing and the discharge cover, a connector pipe installed on the outer periphery of the liquid injection pipe, and housing the liquid injection pipe. One end is connected to the discharge cover, and the space on the discharge chamber side and the space on the compression mechanism side may be isolated.

  According to this configuration, the connector pipe is connected to the discharge cover, and the liquid injection pipe is disposed inside the connector pipe. Therefore, since the space on the high pressure discharge chamber side and the space on the low pressure compression mechanism side are separated by the connector pipe, the connector pipe is not provided and the case where the liquid injection pipe is connected to the discharge cover, Refrigerant leakage can be suppressed.

  A compressor manufacturing method according to a third aspect of the present invention is the compressor manufacturing method according to the first aspect, wherein the housing is assembled by welding joint, and the outside of the housing assembled by welding joint is used. Press-fitting the injection tube into the discharge cover in a direction parallel to the rotation axis of the compressor.

  A compressor manufacturing method according to a fourth aspect of the present invention is the compressor manufacturing method according to the second aspect, comprising assembling the housing by welding joint, and from the outside of the housing assembled by welding joint. Pressing the gas injection pipe into the discharge cover in a direction parallel to the rotation axis of the compressor, and pressing the liquid injection pipe into the cover member in a direction parallel to the rotation axis. .

  ADVANTAGE OF THE INVENTION According to this invention, when installing a gas injection pipe | tube and a liquid injection pipe | tube, an assembly property can be improved, simplifying a structure.

It is a block diagram which shows the refrigerating cycle which concerns on one Embodiment of this invention. It is a fragmentary longitudinal cross-section which shows the principal part of the scroll compressor which concerns on one Embodiment of this invention. It is a cross-sectional view which shows the scroll compressor which concerns on one Embodiment of this invention, and is the AA arrow directional view of FIG. A portion where the refrigerant gas circulates is indicated by a shaded portion. It is a cross-sectional view which shows the scroll compressor which concerns on one Embodiment of this invention, and is the AA arrow directional view of FIG. A portion where the refrigerant liquid circulates is indicated by a shaded portion.

Embodiments according to the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the refrigeration cycle 10 has a scroll compressor 1 that compresses refrigerant (fluid), a condenser 2 that radiates heat of the compressed refrigerant to the outside, and decompresses the refrigerant that has flowed out of the condenser 2. A first expansion valve 3 provided on the high-pressure side, an economizer (gas-liquid separator) 4 that separates the decompressed refrigerant into liquid refrigerant and gas refrigerant, and a second provided on the low-pressure side that further depressurizes the liquid refrigerant. The expansion valve 5, the evaporator 6 that absorbs heat by the decompressed refrigerant, the injection flow path 7 that leads the gas refrigerant from the economizer 4 to the scroll compressor 1, and the liquid refrigerant that leads from the condenser 2 to the scroll compressor 1. An injection flow path 8 and the like are provided.

  The scroll compressor 1 is a hermetic compressor, and as illustrated in FIG. 2, a scroll 11 that compresses a housing 11 having a sealed space therein and a refrigerant that is disposed in the housing 11 and is taken into the sealed space. The main elements are a mechanism 12, a rotary shaft 13 that transmits a rotational force to the scroll compression mechanism 12, and an electric motor that orbits the orbiting scroll 19 of the scroll compression mechanism 12 via the rotary shaft 13.

  The housing 11 is sealed at the bottom by a lower cover, and is provided with a cylindrical intermediate cover 14 that is long in the vertical direction at the top of the lower cover. A discharge cover 15 and an upper cover 16 are provided on the upper portion of the intermediate cover 14, and the housing 11 is hermetically sealed. A discharge of compressed high-pressure gas is discharged between the discharge cover 15 and the upper cover 16. A chamber 17 is formed.

  A scroll compression mechanism 12 is incorporated in the housing 11, and an electric motor including a stator and a rotor is installed below the scroll compression mechanism 12. The electric motor is incorporated by fixing the stator to the housing 11, and the rotating shaft 13 is fixed to the rotor.

  The scroll compression mechanism 12 includes a fixed scroll 18 fixedly installed on the housing 11, a slidably supported, and a revolving scroll 19 that forms a compression chamber 20 by being engaged with the fixed scroll 18.

  A suction port for sucking refrigerant is formed on the side surface of the housing 11 so as to communicate with the sealed space, and the top cover 16 communicates with the discharge chamber 17 to discharge compressed refrigerant gas. A discharge pipe 24 is formed.

  The scroll compression mechanism 12 sucks the refrigerant gas sucked into the housing 11 through the suction pipe and the suction port into the compression chamber 20 through the suction port 21 on the outer peripheral side opened to the inside of the housing 11 and compresses the refrigerant gas. To do. The compressed refrigerant gas passes through the discharge port 22 provided in the center of the fixed scroll 18, the refrigerant flow path 30 provided in the block member 29, and the discharge port 23 provided in the discharge cover 15. The ink is discharged into the discharge chamber 17 and further delivered to the outside of the compressor via a discharge pipe 24 provided on the upper cover 16 and communicating with the discharge chamber 17.

  Further, a gas injection pipe 25 that introduces an intermediate-pressure refrigerant gas into the compression chamber 20 of the scroll compression mechanism 12 is connected to the discharge cover 15 via the injection flow path 7. The gas injection tube 25 is provided through the upper cover 16. An outer pipe 46 is installed around the gas injection pipe 25, and the gas injection pipe 25 is connected to the upper cover 16 through the outer pipe 46. The outer tube 46 has one end connected to the gas injection tube 25 and the other end opened to the inside of the discharge chamber 17.

  The discharge cover 15 is formed with a refrigerant gas passage 31 through which refrigerant gas flows, and the opening of the refrigerant gas passage 31 faces the block member 29. A refrigerant gas distribution channel 44 is formed on the surface of the block member 29 on the discharge cover 15 side. A refrigerant gas distribution channel 45 is formed on the surface of the discharge cover 15 on the block member 29 side. The refrigerant gas distribution channels 44 and 45 are concave grooves and are formed in an annular shape. The refrigerant gas distribution channels 44 and 45 are connected to a plurality of refrigerant gas channels 32 formed in the block member 29.

  The refrigerant gas that has flowed through the refrigerant gas passage 31 is supplied to the refrigerant gas distribution passages 44 and 45. The refrigerant gas supplied to the refrigerant gas distribution channels 44 and 45 is distributed to the plurality of refrigerant gas channels 32 through the refrigerant gas distribution channels 44 and 45. By providing the refrigerant gas distribution passages 44 and 45 in the discharge cover 15 and the block member 29, the number of gas injection pipes 25 penetrating the housing 11 can be reduced. Note that only one of the refrigerant gas distribution channels 44 and 45 may be formed.

  Via a gas injection pipe 25, a refrigerant gas flow path 31 provided in the discharge cover 15, a refrigerant gas flow path 32 provided in the block member 29, and a gas injection port 26 provided in the fixed scroll 18. Thus, the refrigerant gas is supplied to the compression chamber 20. Refrigerant gas can be supplied to the compression chamber 20 via the gas injection pipe 25.

  Further, a liquid injection pipe 40 for introducing a refrigerant liquid into the compression chamber 20 of the scroll compression mechanism 12 is connected to the discharge cover 15 via the injection flow path 8. The liquid injection tube 40 is provided so as to penetrate the upper cover 16 and the discharge cover 15. A connector pipe 47 is installed around the liquid injection pipe 40, and an outer pipe 48 is installed around the connector pipe 47.

  The liquid injection tube 40 is connected to the upper cover 16 via the outer tube 48. The outer tube 48 has one end connected to the liquid injection tube 40 and the other end opened to the inside of the discharge chamber 17. The liquid injection tube 40 is connected to the discharge cover 15 via the connector tube 47. One end of the connector pipe 47 is connected to the liquid injection pipe 40 and the other end is connected to the discharge cover 15, and opens to a low pressure space below the discharge cover 15.

  One end of the connector pipe 47 is connected to the discharge cover 15 and isolates the space on the discharge chamber 17 side and the low-pressure space on the scroll compression mechanism 12 side. Thereby, the connector pipe 47 is connected to the discharge cover 15, and the liquid injection pipe 40 is disposed inside the connector pipe 47. Therefore, since the space on the high pressure discharge chamber 17 side and the space on the low pressure scroll compression mechanism 12 side are separated by the connector pipe 47, the connector pipe 47 is not provided, and the liquid injection pipe 40 is connected to the discharge cover 15. Unlike the case of being connected, leakage of the refrigerant can be suppressed.

  The refrigerant liquid is supplied to the compression chamber 20 via the liquid injection pipe 40, the refrigerant liquid flow path 41 provided in the block member 29, and the liquid injection port 42 provided in the fixed scroll 18. Thereby, the refrigerant liquid can be supplied to the compression chamber 20 through the liquid injection pipe 40.

  Switching between introduction of the refrigerant gas via the gas injection pipe 25 and introduction of the refrigerant liquid via the liquid injection pipe 40 is performed, for example, by opening / closing an electromagnetic valve (not shown) based on a signal from the control unit.

  The reed valve 27 is a thin plate member and is provided at the outlet of the discharge port 22 to open and close the discharge port 22. The reed valve 27 regulates the flow of the refrigerant in only one direction. By providing the reed valve 27, the refrigerant flows from the compression chamber 20 to the discharge chamber 17 side.

  In the movable direction of the reed valve 27, a retainer 33 that limits the movable range (opening upper limit) of the reed valve 27 is provided. When the reed valve 27 is opened, the reed valve 27 contacts the retainer 33, whereby the retainer 33 can be regulated so that the reed valve 27 does not open too much. The retainer 33 is a member having high rigidity that hardly causes deformation.

  The reed valve 27 is a member that is long in one direction, and its end has an arc shape, for example. One end side of the reed valve 27 is fixed to the fixed scroll 18 by a bolt (not shown), and the other end side of the reed valve 27 can be opened and closed with respect to the discharge port 22. Similarly to the reed valve 27, the retainer 33 is also a member that is long in one direction, and one end side thereof is fixed together with the reed valve 27 by a bolt.

  As shown in FIG. 2, the fixed scroll 18 includes a substantially disc-shaped end plate 18 a and a spiral wall body 18 b erected on one side surface of the end plate 18 a. As shown in FIG. 2, the orbiting scroll 19 includes a substantially disc-shaped end plate 19a and a spiral wall body 19b provided upright on one side surface of the end plate 19a. The spiral shape of each wall 18b, 19b is defined using, for example, an involute curve or an Archimedean curve. In the fixed scroll 18, a discharge port 22, a gas injection port 26, and a liquid injection port 42 are formed in the end plate 18 a so as to penetrate in the plate thickness direction.

The fixed scroll 18 and the orbiting scroll 19 are engaged with each other with their centers O ₁ and O ₂ separated from each other by the orbiting radius ρ and the phases of the walls 18b and 19b shifted by 180 °. It is assembled so as to have a slight clearance in the height direction (tip clearance) between the tooth tip and the tooth bottom at normal temperature. As a result, a plurality of pairs of compression chambers 20 formed between the end plates 18a and 19a and the wall bodies 18b and 19b are formed symmetrically between the scrolls 18 and 19 with respect to the scroll center. The orbiting scroll 19 revolves around the fixed scroll 18 by an anti-rotation mechanism such as an Oldham ring.

  The block member 29 is an example of a cover member, and is installed on the surface of the fixed scroll 18 on the discharge cover 15 side by bolts 35 between the fixed scroll 18 and the discharge cover 15.

  The block member 29 includes a refrigerant flow path 30, a plurality of refrigerant gas flow paths 32 through which the refrigerant from the gas injection pipe 25 flows, and a plurality of refrigerant liquid flow paths 41 through which the refrigerant from the liquid injection pipe 40 flows. It is formed. The refrigerant gas passage 32 and the refrigerant liquid passage 41 are formed in the block member 29 so as to penetrate from the surface on the discharge cover 15 side to the fixed scroll 18 side.

  In the block member 29, concave reed valve chambers 36 and 43 are formed on the surface on the fixed scroll 18 side. As shown by the shaded portion in FIG. 3, the refrigerant gas that has flowed through the gas injection pipe 25 is supplied to the refrigerant gas passages 31 and 32 and then supplied to the reed valve chamber 36. The refrigerant liquid that has flowed through the liquid injection pipe 40 is supplied to the refrigerant liquid channel 41 and then to the reed valve chamber 43 as shown by the shaded portion in FIG.

  In the reed valve chamber 36, the gas injection port 26 of the fixed scroll 18 is opened. In addition, in the reed valve chamber 43, the liquid injection port 42 of the fixed scroll 18 is opened. The reed valve 37 accommodated in the reed valve chambers 36 and 43 is fixed by a bolt 38.

  The reed valve 37 is a thin plate-like member and is provided at the outlet of the refrigerant gas flow path 32 or the refrigerant liquid flow path 41 and opens and closes the refrigerant gas flow path 32 or the refrigerant liquid flow path 41. The reed valve 37 regulates the flow of the refrigerant only in one direction. By providing the reed valve 37, the refrigerant flows from the gas injection pipe 25 or the liquid injection pipe 40 to the compression chamber 20 side of the fixed scroll 18.

  In the movable direction of the reed valve 37, a retainer 39 that limits the movable range (opening upper limit) of the reed valve 37 is provided. When the reed valve 37 is opened, the retainer 39 can be regulated so that the reed valve 37 does not open too much by hitting the retainer 39 with the reed valve 37. The retainer 39 is a highly rigid member that is unlikely to deform.

  The reed valve 37 is a member that is long in one direction, and its end has, for example, an arc shape. One end side of the reed valve 37 is fixed to the block member 29 by a bolt 38, and the other end side of the reed valve 37 can be opened and closed with respect to the refrigerant gas passage 32 or the refrigerant liquid passage 41. Similarly to the reed valve 37, the retainer 39 is also a member that is long in one direction, and one end side is fixed together with the reed valve 37 by a bolt 38.

  As shown in FIG. 2, an annular groove 49 is formed on the surface of the block member 29 on the discharge cover 15 side. The groove 49 is formed so as to surround the refrigerant flow path 30 around the refrigerant flow path 30 formed in the block member 29. In the groove 49, the refrigerant gas flow path 32 is arranged. An annular protrusion 50 is formed on the surface of the discharge cover 15 on the block member 29 side. When the block member 29 and the discharge cover 15 are combined, the protrusion 50 is inserted into the groove 49 of the block member 29. The refrigerant gas flow path 31 is disposed in the portion where the protrusion 50 is formed. In order to reduce the gap between the groove 49 and the protrusion 50 in a state where the groove 49 and the protrusion 50 are combined, an O-ring 51 is installed on the inner wall surface of the groove 49. Thereby, the high pressure side and the low pressure side can be reliably separated at the portion where the groove 49 and the protrusion 50 are combined.

  As described above, one end of the gas injection tube 25 is connected to the discharge cover 15. When the refrigerant gas is introduced into the compression chamber 20, the refrigerant gas flows through the gas injection pipe 25, and the refrigerant gas flowing through the gas injection pipe 25 passes through the gas injection pipe 25 as shown by the shaded portion in FIG. 3. , 32 and then to the reed valve chamber 36. Then, the refrigerant gas is introduced into the compression chamber 20 of the scroll compression mechanism 12 through a gas injection port 26 formed in the fixed scroll 18.

  Further, one end of the liquid injection tube 40 is connected to the block member 29. When introducing the refrigerant liquid into the compression chamber 20, the refrigerant liquid flows through the liquid injection pipe 40 and is supplied to the refrigerant liquid flow path 41 as shown by the shaded portion in FIG. 4, and then to the reed valve chamber 43. Supplied. The refrigerant liquid is introduced into the compression chamber 20 of the scroll compression mechanism 12 through the liquid injection port 42 formed in the fixed scroll 18.

  When assembling the scroll compressor 1 described above, the housing 11 is assembled before the gas injection pipe 25 and the liquid injection pipe 40 are connected to the internal components. That is, the parts such as the scroll compression mechanism 12 and the electric motor are arranged in the housing 11, and the intermediate cover 14 and the discharge cover 15 of the housing 11 are welded with the gas injection pipe 25 and the liquid injection pipe 40 not connected. Joining and welding the discharge cover 15 and the upper cover 16 are performed.

  Thereafter, the gas injection tube 25 is press-fitted into the discharge cover 15 from the outside of the upper cover 16, and the gas injection tube 25 is connected to the discharge cover 15. Further, an outer tube 46 is provided around the gas injection tube 25 and connected to the gas injection tube 25 and the upper cover 16.

  Further, the liquid injection tube 40 is press-fitted into the block member 29 from the outside of the upper cover 16, and the liquid injection tube 40 is connected to the block member 29. Further, the connector pipe 47 and the outer pipe 48 are provided around the liquid injection pipe 40, the connector pipe 47 is connected to the discharge cover 15 and the liquid injection pipe 40, and the outer pipe 48 is connected to the upper cover 16 and the liquid injection pipe 40. To do. The press-fitting directions of the gas injection pipe 25 and the liquid injection pipe 40 are parallel to the axial direction of the rotary shaft 13.

  According to this embodiment, the gas injection pipe 25 and the liquid injection pipe 40 are press-fitted into the internal parts, whereby the connection between the gas injection pipe 25 and the liquid injection pipe 40 and the internal parts can be completed. When the scroll compressor 1 is assembled, the housing 11 is first assembled before connecting the gas injection pipe 25 and the liquid injection pipe 40 to internal components. Therefore, when welding is performed around the housing 11, it is not necessary to cure the gas injection pipe 25 and the liquid injection pipe 40 that protrude from the housing 11. Therefore, welding work when assembling the housing 11 is facilitated.

  In the above-described embodiment, the case where the gas injection pipe 25 is connected to the discharge cover 15 and the refrigerant gas distribution channels 44 and 45 are formed has been described, but the present invention is not limited to this example. That is, instead of the gas injection pipe, the liquid injection pipe may be connected to the discharge cover, the refrigerant liquid distribution channel may be formed in an annular shape, and the refrigerant liquid may be distributed to a plurality of refrigerant liquid channels.

1: Scroll compressor 2: Condenser 3: 1st expansion valve 4: Economizer 5: 2nd expansion valve 6: Evaporator 7 and 8: Injection flow path 10: Refrigeration cycle 11: Housing 12: Scroll compression mechanism 13: Rotation Shaft 14: Intermediate cover 15: Discharge cover 16: Upper cover 17: Discharge chamber 18: Fixed scroll 19: Orbiting scroll 20: Compression chamber 21: Suction port 22: Discharge port 23: Discharge port 24: Discharge tube 25: Gas injection tube 26: Gas injection ports 27, 37: Reed valve 29: Block member (cover member)
30: Refrigerant flow paths 31, 32: Refrigerant gas flow paths 33, 39: Retainers 35, 38: Bolts 36, 43: Reed valve chamber 40: Liquid injection pipe 41: Refrigerant liquid flow path 42: Liquid injection ports 44, 45: Refrigerant gas distribution channels 46, 48: outer pipe 47: connector pipe 49: groove 50: protrusion 51: O-ring

Claims (6)

A housing;
A scroll-type compression mechanism housed in the housing and having a fixed scroll;
A discharge cover provided with a discharge port through which the refrigerant compressed by the compression mechanism and discharged from the fixed scroll passes;
A cover member installed between the discharge cover and the fixed scroll;
One end of which is connected to the discharge cover, and an injection pipe through which a refrigerant introduced into the compression chamber of the compression mechanism flows;
With
The discharge cover or the cover member has a refrigerant distribution channel through which the refrigerant supplied from the injection pipe is distributed in a plurality of ways,
The cover member is formed to penetrate from the first surface on the discharge cover side to the second surface on the fixed scroll side, and has a plurality of refrigerant flow paths through which the refrigerant distributed in the refrigerant distribution flow path flows. And
The compressor in which the fixed scroll is formed with an injection port for introducing the refrigerant that has passed through the refrigerant flow path into the compression chamber. A housing;
A scroll-type compression mechanism housed in the housing and having a fixed scroll;
A discharge cover provided with a discharge port through which the refrigerant compressed by the compression mechanism and discharged from the fixed scroll passes;
A cover member installed between the discharge cover and the fixed scroll;
A gas injection pipe having one end connected to the discharge cover and through which a gaseous refrigerant gas introduced into the compression chamber of the compression mechanism flows;
One end is connected to the cover member, a liquid injection pipe through which a liquid refrigerant liquid introduced into the compression chamber flows,
With
The discharge cover or the cover member has a refrigerant gas distribution flow path in which the refrigerant gas supplied from the gas injection pipe is distributed into a plurality of parts,
The cover member is
A plurality of refrigerant gas passages formed by penetrating from the first surface on the discharge cover side to the second surface on the fixed scroll side, and through which the refrigerant gas distributed in the refrigerant gas distribution passage flows;
A refrigerant liquid passage formed through the first surface from the first surface and through which the refrigerant liquid supplied from the liquid injection pipe flows;
Have
The fixed scroll includes a gas injection port that introduces the refrigerant gas that has passed through the refrigerant gas flow path into the compression chamber, and a liquid injection port that introduces the refrigerant liquid that has passed through the refrigerant liquid flow path into the compression chamber. And a compressor that is formed. The cover member is
A first check valve installed on the second surface to prevent backflow of the refrigerant gas supplied from the refrigerant gas flow path;
A second check valve that is installed on the second surface and prevents a back flow of the refrigerant liquid supplied from the refrigerant liquid flow path;
The compressor according to claim 2. A discharge chamber formed between the housing and the discharge cover;
A connector pipe installed on the outer periphery of the liquid injection pipe and containing the liquid injection pipe;
4. The compressor according to claim 2, wherein one end of the connector pipe is connected to the discharge cover and separates the space on the discharge chamber side and the space on the compression mechanism side. A method for manufacturing a compressor according to claim 1,
Assembling the housing by weld bonding;
Press-fitting the injection pipe into the discharge cover from the outside of the housing assembled by welding and joining in a direction parallel to the rotation axis of the compressor;
The manufacturing method of the compressor which has this. It is a manufacturing method of the compressor given in any 1 paragraph of Claims 2-4,
Assembling the housing by weld bonding;
The gas injection tube is press-fitted into the discharge cover in a direction parallel to the rotation axis of the compressor from the outside of the housing assembled by welding and joined, and the liquid injection tube is inserted into the cover member and the rotation shaft. A step of press-fitting in a parallel direction,
The manufacturing method of the compressor which has this.

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