SCROLL COMPRESSOR

A scroll compressor capable of improving the performance and efficiency of the compressor by increasing the amount of refrigerant discharged from a compression chamber by introducing not only refrigerant at suction pressure but also refrigerant at an intermediate pressure to the compression chamber of the scroll compressor, capable of freely changing the position of a port by simplifying the shape of an injection valve assembly and by disposing a fastening member on an introduction chamber side, and capable of compactifying the injection valve assembly.

TECHNICAL FIELD

The present disclosure relates to a scroll compressor and more particularly to a scroll compressor capable of improving the performance and efficiency of the compressor by increasing the amount of refrigerant discharged from a compression chamber by introducing not only refrigerant at suction pressure but also refrigerant at an intermediate pressure to the compression chamber of the scroll compressor, capable of freely changing the position of a port by simplifying the shape of an injection valve assembly and by disposing a fastening member on an introduction chamber side, and capable of compactifying the injection valve assembly.

BACKGROUND ART

In general, a vehicle is equipped with an air conditioning (A/C) system for heating and cooling the interior of the vehicle. Such an air conditioning system includes a compressor as a component of the cooling system. The compressor compresses a low-temperature and low-pressure gaseous refrigerant introduced from an evaporator into a high-temperature and high-pressure gaseous refrigerant, and transfers it to a condenser.

There are two types of compressors, that is to say, a reciprocating type compressor which compresses a refrigerant according to a reciprocating motion of a piston and a rotary type compressor which compresses a refrigerant while performing a rotational motion. The reciprocating type compressor includes a crank type compressor which transmits a driving force of a driving source to a plurality of pistons by using a crank and a swash plate type compressor which transmits a driving force of a driving source to a rotating shaft with the swash plate installed therein, etc., in accordance with a transmission method of the driving source. The rotary type compressor includes a vane rotary type using a rotating shaft and a vane, and a scroll type compressor using an orbiting scroll and a fixed scroll.

The scroll compressor is widely used for refrigerant compression in air conditioners, etc., because the scroll compressor can obtain a relatively high compression ratio compared to other types of compressors and can obtain a stable torque thanks to smooth connection of the suction, compression, and discharge strokes of the refrigerant.

Patent Document 1 (KR 10-2018-0094483 A) discloses a scroll compressor in the related art that performs a series of processes of sucking only a refrigerant with suction pressure into a compression chamber, compressing the refrigerant, and then discharging the refrigerant to the outside. However, the scroll compressor in the related art has a problem in which a discharge amount of the refrigerant to be discharged from the compression chamber is determined, which causes a limitation in improving the performance and efficiency of the compressor.

To solve the problem, Patent Document 2 (KR 2021-0118743 A) discloses a scroll compressor equipped with an injection valve assembly700including a leakage prevention means and an injection valve configured to open or close an injection flow path that guides a middle-pressure refrigerant, which is introduced from the outside of a compressor, to a compression chamber C.

Specifically, the injection valve assembly700includes a cover plate710, an injection valve720, a valve plate730, and a gasket retainer790provided as a leakage prevention means. A fastening bolt770is fastened to a fastening recess138aof a rear housing through a first fastening hole739aof the valve plate, a third fastening hole796of the gasket retainer, and a second fastening hole714of the cover plate, so that the injection valve assembly700can be fastened to the rear housing130. Due to this, the gasket retainer790is compressed between the cover plate710and the valve plate730and sealing is made between them. The injection valve720is compressed together between the cover plate710and the gasket retainer790and fixed.

However, since the injection valve assembly700has a complex shape and is difficult to rotate, there is a problem that it is difficult to change the design according to positions of an introduction port133and a discharge port131for each vehicle. In other words, the injection valve assembly700has a low design flexibility. Also, there is a disadvantage that the fastening bolt770is disposed on the outside of a third annular wall138that forms an introduction chamber I, making a package larger.

SUMMARY

The purpose of the present disclosure is to provide a scroll compressor capable of improving the performance and efficiency of the compressor by increasing the amount of refrigerant discharged from a compression chamber by introducing not only refrigerant at suction pressure but also refrigerant at an intermediate pressure to the compression chamber of the scroll compressor, capable of freely changing the position of a port by simplifying the shape of an injection valve assembly and by disposing a fastening member on an introduction chamber side, and capable of compactifying the injection valve assembly.

The technical problem to be overcome in the present disclosure is not limited to the above-mentioned technical problems. Other technical problems not mentioned can be clearly understood from those described below by a person having ordinary skill in the art.

One embodiment is a scroll compressor including: a housing; a motor provided within the housing; a rotation shaft configured to be rotated by the motor; an orbiting scroll configured to perform an orbiting motion in conjunction with the rotation shaft; and a fixed scroll configured to form, together with the orbiting scroll, a compression chamber. The housing includes a rear housing that forms a discharge chamber receiving refrigerant discharged from the compression chamber. The rear housing includes a partition wall that partitions the discharge chamber and an introduction chamber into which the refrigerant is introduced from the outside of the housing. An injection valve assembly is provided between the fixed scroll and the partition wall of the rear housing, covers the introduction chamber, and guides the refrigerant of the introduction chamber to the compression chamber. The partition wall has a first surface and a second surface higher than the first surface such that they surround a portion of a side of the injection valve assembly. A fastening member which fastens the injection valve assembly to a rear housing is disposed radially inner side of the second surface.

The injection valve assembly may include a sealing portion for sealing between the injection valve assembly and a head of the fastening member.

The injection valve assembly may include: a cover plate configured to be disposed on the partition wall and has an inlet through which the refrigerant of the introduction chamber is introduced; a gasket retainer configured to be coupled to the partition wall; an injection valve configured to be interposed between the cover plate and the gasket retainer and opens or closes the inlet; and a valve plate configured to be coupled to the gasket retainer and to have an outlet through which the refrigerant introduced through the inlet flows out.

A sealing portion for sealing between the injection valve assembly and a head of the fastening member may be provided on one surface of the valve plate where the head of the fastening member is seated. The sealing portion may protrude to surround a fastening hole of the valve plate, through which the fastening member passes.

A sealing portion for sealing between the injection valve assembly and a head of the fastening member may be inserted between the head of the fastening member and one surface of the valve plate and may be compressed when the fastening member is tightened.

The gasket retainer may include: a bead portion extending along a circumference thereof and protruding toward the valve plate; and a fastening hole through which the fastening member passes. The bead portion may surround the fastening hole.

The bead portion may include an outer inclined bead portion on a radially outer side thereof, an inner inclined bead portion on a radially inner side thereof, and a protruding bead portion connecting the outer inclined bead portion and the inner inclined bead portion. The fastening hole may be formed more inward in the radial direction than the outer inclined bead portion.

The outer inclined bead portion may be compressed between the second surface and the valve plate when the injection valve assembly is assembled, and the inner inclined bead portion may be compressed between the first surface and the valve plate when the injection valve assembly is assembled.

The gasket retainer may include: a fastening hole through which the fastening member passes; a first bead portion which extends along a radial outer circumference of the fastening hole and protrudes toward the cover plate; and a second bead portion which extends along a radial inner circumference of the fastening hole and protrudes toward the cover plate.

The gasket retainer may further include: a retainer portion which is processed to be inclined in a direction in which the injection valve opens; and a valve bead portion which protrudes toward the valve plate.

The valve bead portion may be provided at a point where an inclination of the retainer portion starts.

A protrusion height of the first bead portion may be greater than a protrusion height of the second bead portion and a protrusion height of the valve bead portion.

The valve bead portion may be provided in a direction crossing a width of the retainer portion.

The injection valve may include a valve portion which is bent to open and close the inlet. A hole extending in a longitudinal direction of the valve portion may be provided in the valve portion.

The hole may be provided in a middle of the valve portion in a width direction of the valve portion and may extend in the longitudinal direction from a point where bending of the valve portion starts.

The gasket retainer may include: a circular body portion; a retainer portion which obliquely extends close to the valve plate toward the inlet from one side of the body portion; and a support portion which connects the retainer portion and the other side of the body portion in order to support the retainer portion and is formed to be inclined.

The support portion may be connected to an end of the retainer portion that is spaced furthest from the body portion in a direction in which the injection valve is opened, and a flow hole may be formed in the support portion.

An open surface of the flow hole may extend from the support portion to a portion of the body portion, and may include a surface parallel to the body portion and an inclined surface of the support portion.

The valve plate may include an inclined space where the retainer portion is seated. The outlet may communicate with the inclined space and may be disposed at a position corresponding to the flow hole.

The fastening hole of the valve plate, through which the fastening member passes, may be disposed on a radially outer side of the inclined space.

According to the embodiment of the present disclosure, it is possible to improve the performance and efficiency of the compressor by increasing the amount of the refrigerant discharged from the compression chamber by introducing not only refrigerant at suction pressure but also refrigerant at an intermediate pressure to the compression chamber of the scroll compressor.

Also, according to the embodiment, when the injection valve assembly is formed in a circular shape, the injection valve assembly is able to rotate with respect to the introduction chamber, so that it is possible to freely change the design of the injection valve assembly depending on the position of the port for each vehicle. Also, an axial force of the fastening member and surface pressure generated by the bead portion of the gasket retainer may be wholly uniformly transferred along the perimeter of the injection valve assembly.

Also, according to the embodiment, when the fastening member is disposed on the introduction chamber side, that is, on the first surface of the partition wall forming the introduction chamber, the injection valve assembly can be compactified. When the sealing portion is provided on one side of the valve plate where the head of the fastening member is seated, refrigerant leakage can be prevented.

Also, according to the embodiment, when the flow hole is formed in front of the retainer portion such that the refrigerant introduced through the inlet can flow to the outlet when the injection valve is opened on the retainer portion, the refrigerant flow through the gasket retainer is not interfered, and thus, no pressure loss occurs.

Also, according to the embodiment, the bead portion is provided not only on both the radial outer circumference and radial inner circumference of the fastening hole in the gasket retainer, but also on the point where the inclination of the retainer portion starts, so that the bending point of the injection valve can be accurately determined.

Also, a hole is formed in the valve portion of the injection valve according to the embodiment, so that it is possible to prevent distortion and reduce the power during the opening and closing operation of the injection valve.

The effect of the present disclosure is not limited to the above effects and should be construed as including all the effects that can be inferred from the configuration of the present disclosure disclosed in the detailed description or claims of the present disclosure.

DESCRIPTION OF AN EMBODIMENT

Hereinafter, a preferred embodiment of a scroll compressor of the present disclosure will be described with reference to the accompanying drawings.

Also, the below-mentioned terms are defined in consideration of the functions in the present disclosure and may be changed according to the intention of users or operators or custom. The following embodiments do not limit the scope of the present disclosure and are merely exemplary of the components presented in the claims of the present disclosure.

Parts irrelevant to the description will be omitted for a clear description of the present disclosure. The same or similar reference numerals will be assigned to the same or similar components throughout this specification. Throughout this specification, when it is mentioned that a portion “includes” an element, it means that the portion does not exclude but further includes other elements unless there is a special opposite mention.

The scroll compressor according to the embodiment of the present disclosure includes a housing100, a motor200provided within the housing100, a rotation shaft300that is rotated by the motor200, an orbiting scroll400that performs an orbiting motion in conjunction with the rotation shaft300, a fixed scroll500that forms, together with the orbiting scroll400, a compression chamber C, and a discharge valve600that is disposed on one surface of the fixed scroll500and configured to open or close a discharge port512of the fixed scroll from which a refrigerant compressed in the compression chamber C is discharged. Here, the components identical to the components of the scroll compressor of Patent Document 2 are denoted by the same reference numerals, and detailed descriptions of the identical components will be omitted.

Also, the scroll compressor according to the embodiment may further include an injection valve assembly2700that forms and opens or closes an injection flow path configured to guide an intermediate pressure refrigerant to the compression chamber C from the outside of the housing100(e.g., a downstream side of a condenser in a vapor compression refrigeration cycle including the scroll compressor, the condenser, an expansion valve, and an evaporator).

The housing100includes a center housing110through which the rotation shaft300passes, a front housing120that forms a motor receiving space receiving the motor200, and a rear housing130that forms a discharge chamber D receiving the refrigerant discharged from the compression chamber C. The injection valve assembly2700may be interposed between the fixed scroll500and the rear housing130. The injection valve assembly2700covers an introduction chamber I which is within the rear housing130and into which the refrigerant is introduced from the outside of the housing. The injection valve assembly2700guides the refrigerant of the introduction chamber I to the compression chamber C.

As shown inFIG.2, the rear housing130includes a first annular wall134that protrudes from a rear end plate and is located on the outermost side in the circumferential direction, a second annular wall136that protrudes from the rear end plate and is received in the first annular wall134, and a partition wall138that protrudes from the rear end plate and is received in the second annular wall136. Here, the first annular wall134, the second annular wall136, and the partition wall138are formed to have different heights.

The first annular wall134is fastened to the center housing110and forms a scroll receiving space, and the second annular wall136comes into contact with the fixed scroll500and form the discharge chamber D. Here, as the second annular wall136contacts the fixed scroll500, when the rear housing130is fastened to the center housing110, the fixed scroll500is pressed toward the center housing110, thereby improving a fastening force between the fixed scroll500and the center housing110and preventing leakage. The partition wall138has a protruding length less than that of the second annular wall136in such a way as to be spaced apart from the fixed scroll500. Also, as to be described below, the partition wall138is covered by a cover plate2710of the injection valve assembly2700and partitions the introduction chamber I.

Here, as shown inFIGS.2and5, the partition wall138has a first surface138aand a second surface138bhigher than the first surface138asuch that they surround a portion of a side of the injection valve assembly2700. Specifically, the first surface138aand the second surface138bextend in parallel, and the second surface138bprotrudes more from the rear end plate than the first surface138a, and thus, is higher than the first surface138a. The first surface138ais formed more inward in the partition wall in the radial direction than the second surface138b, so that a stepped portion formed by the first surface138aand the second surface138bmay be formed concavely around the inside of the partition wall. The first surface138aand the second surface138bare connected by a third surface138cfacing a portion of the side of the injection valve assembly2700. The third surface138cmay extend vertically from the first surface138aand be connected to the second surface138b.

A discharge port131that guides the refrigerant in the discharge chamber D to the outside of the housing100is formed on the rear end plate of the rear housing130. The refrigerant in the discharge chamber D is guided to the discharge port131through a discharge port inlet131ashown inFIG.4. Also, an introduction port133through which the intermediate pressure refrigerant is introduced from the outside of the housing100is formed on the rear end plate of the rear housing130. The intermediate pressure refrigerant may be guided from the introduction port133to the introduction chamber I through an introduction port outlet133ashown inFIG.2.

Here, the positions of the discharge port131and the introduction port133may be changed depending on a vehicle. In order to freely change the design of the injection valve assembly2700according to the position of the port for each vehicle, the injection valve assembly2700according to the embodiment of the present disclosure may be formed in a circular shape. That is, as the injection valve assembly2700is formed in a circular shape, the injection valve assembly2700is able to rotate with respect to the introduction chamber I, so that it is possible to freely change the design of the injection valve assembly2700depending on the position of the port for each vehicle. In addition, an axial force of a fastening bolt770and surface pressure generated by a bead portion of a gasket retainer2790, which will be described later, may be wholly uniformly transferred along the perimeter of the injection valve assembly2700.

In addition, in the present disclosure, the fastening member for fastening the injection valve assembly2700to the rear housing130is disposed on the introduction chamber I side, not on the discharge chamber D side, and specifically on the first surface138aof the partition wall. Hereinafter, the fastening member will be described as a fastening bolt770. Accordingly, the injection valve assembly2700can be compactified and the design of the injection valve assembly can be changed more easily. For this purpose, as shown inFIG.2, a first fastening recess139into which the fastening bolt770is inserted is formed on the first surface138aof the partition wall of the rear housing130.

Hereinafter, the injection valve assembly2700will be described in detail with reference toFIGS.3to9. The injection valve assembly2700is provided on a front-end surface of the partition wall138in such a way as to communicate and block between an injection port of the fixed scroll500and the introduction chamber I.

Specifically, the injection valve assembly2700may include the cover plate2710that is disposed on the partition wall138and has an inlet2712through which the refrigerant of the introduction chamber I is introduced, a gasket retainer2790that is coupled to the partition wall138, an injection valve2720that is interposed between the cover plate2710and the gasket retainer2790and opens or closes the inlet2712, and a valve plate2730that is coupled to the gasket retainer2790and has an outlet2736through which the refrigerant introduced through the inlet2712flows out.

As shown inFIGS.3and6, the cover plate2710is formed as a circular plate and includes a pair of inlets2712aand2712bthrough which the refrigerant of the introduction chamber I is introduced. That is, the cover plate2710includes the first inlet2712athat communicates with one side of the introduction chamber I and the second inlet2712bthat is formed independently of the first inlet2712aand communicates with the other side of the introduction chamber I. Here, it is preferable that the first inlet2712aand the second inlet2712bshould be formed in the form of an elongated hole respectively in order to maximize a valve lifting force and refrigerant inlet flow rate.

In particular, in the embodiment, the cover plate2710is seated on a concave portion composed of the first surface138aand the third surface138cso as to come in surface contact with the first surface138aof the partition wall. Accordingly, the cover plate2710itself can perform serve as a seal to prevent internal leakage between the discharge chamber D and the introduction chamber I. As a result, there is no requirement for a separate O-ring between the partition wall138of the rear housing and the cover plate2710and groove processing for the O-ring, so that the number of parts, processing time, and cost can be reduced and there is no problem that the O-ring is separated from the groove.

Moreover, as will be described later, the injection valve assembly2700includes the gasket retainer2790coupled to the second surface138bof the partition wall in such a manner as to surround the stepped portion, thereby preventing the internal leakage between the discharge chamber D and the introduction chamber I by the single sealing member (gasket retainer).

Here, it is desirable that the partition wall138should be formed in a circular shape as with the injection valve assembly2700formed in a circular shape. Due to this, the cover plate2710is seated on the concave portion of the stepped portion, thereby covering the introduction chamber I within the partition wall138.

As shown inFIG.5, in order for the cover plate2710to fixedly support the injection valve2720and also to satisfy the sealing, it is preferable that a height difference “h” between the first surface138aand the second surface138bshould be smaller than a sum of a thickness “t1” of the cover plate2710and a thickness “t2” of the injection valve2720. By satisfying these dimensions, the injection valve2720can be pressed and fixed between the cover plate2710and the gasket retainer2790. That is, the injection valve2720can be unconditionally fixed in contact with the gasket retainer2790, and appropriate surface pressure is formed between the injection valve2720and the gasket retainer2790, so that it is possible to prevent damage to the injection valve2720by vibration that is generated when the refrigerant flows through the injection valve2720.

The cover plate2710further includes a first positioning hole2716through which a positioning pin passes. Also, since the fastening bolt770is disposed within the partition wall138, a second fastening recess2714that is formed concave inward in the radial direction for the fastening bolt770to pass through is formed on a periphery of the cover plate2710.

As shown inFIGS.3and7, the injection valve2720includes a circular body portion2726and a pair of valve portions2721aand2721bextending from the body portion2726toward the pair of inlets2712aand2712b, respectively. That is, the injection valve2720includes the first valve portion2721aextending from one side of the body portion2726toward the first inlet2712ain order to open or close the first inlet2712a, and the second valve portion2721bextending from the other side of the body portion2726toward the second inlet2712bin order to open or close the second inlet2712b. In the embodiment, the first valve portion2721aand the second valve portion2721bextend parallel to each other on the opposite side of the body portion2726. It is preferable that the body portion2726and the pair of valve portions2721aand2721bshould be formed integrally in order to reduce the number of parts, size, cost, and weight.

Here, the first valve portion2721aincludes a first head2722athat is disposed on the first inlet2712a, and a first leg2724athat connects the first head2722aand the body portion2726. Likewise, the second valve portion2721bincludes a second head2722bthat is disposed on the second inlet2712b, and a second leg2724bthat connects the second head2722band the body portion2726.

The body portion2726further includes a second positioning hole2727which is in communication with the first positioning hole2716and through which a positioning pin passes. Also, a third fastening recess2728that is formed concave inward in the radial direction for the fastening bolt770to pass through is formed on a periphery of the injection valve2720, more precisely, on a periphery of the body portion2726.

As shown inFIGS.3and8, the gasket retainer2790includes a circular body portion2791, a pair of retainer portions2794aand2794bobliquely extending close to the valve plate2730toward the pair of inlets2712aand2712bfrom the body portion2791, and a pair of support portions2795aand2795bthat connects the body portion2791and the pair of retainer portions2794aand2794b, respectively, in order to support the retainer portion and is formed to be inclined. It is preferable that the peripheral shape and dimension of the body portion2791of the gasket retainer should be the same as the outer peripheral shape and dimension of the partition wall138.

Specifically, the gasket retainer2790includes the first retainer portion2794aextending obliquely from one side of the body portion2791toward the first inlet2712ain such a way as to correspond to the first valve portion2721a, and a second retainer portion2794bextending from the other side of the body portion2791toward the second inlet2712bin such a way as to correspond to the second valve portion2721b. Also, the first support portion2795aconnects the other side of the body portion2791and the first retainer portion2794a, and the second support portion2795bconnects one side of the body portion2791and the second retainer portion2794b.

The first retainer portion2794aand the second retainer portion2794bare processed obliquely to be closer to the valve plate2730as they extend from the body portion2791. Therefore, when the injection valve2720is opened to open the pair of inlets2712, the first retainer portion2794aand the second retainer portion2794bmay limit positions where the first valve portion2721aand the second valve portion2721bare opened to the maximum while supporting the first valve portion2721aand the second valve portion2721b, respectively. In the embodiment, the first retainer portion2794aand the second retainer portion2794bextend parallel to each other on opposite side of the body portion2791in correspondence to the first valve portion2721aand the second valve portion2721b.

Here, a flow hole2796may be formed in front of the retainer portion2794such that the refrigerant introduced through the inlet2712can flow to the outlet2736to be described later, without pressure loss when the injection valve2720is opened on the retainer portion2794. In the embodiment, since the support portion2795is connected to the front end of the retainer portion2794that is spaced furthest from the body portion2791in the direction in which the injection valve2720is opened, the flow hole2796may be formed in the support portion2795. That is, the first support portion2795ais provided with the first flow hole2796a, so that the refrigerant introduced through the first inlet2712acan flow directly through the first flow hole2796ato the first outlet2736ato be described later, and the second support portion2795bis provided with the second flow hole2796b, so that the refrigerant introduced through the second inlet2712bcan flow directly through the second flow hole2796bto the second outlet2736bto be described later. In particular, the retainer portion2794and the support portion2795are arranged in a line. Due to this, the refrigerant introduced through the inlet2712can flow directly to the outlet2736through the flow hole2796instead of flowing to both sides of the retainer portion2794, so that the refrigerant flow through the gasket retainer2790is not interfered, and thus, no pressure loss occurs.

In addition, an open surface of the flow hole2796may extend from the support portion2795to a portion of the body portion2791, and may include a surface parallel to the body portion2791and an inclined surface of the support portion2795. The interference of the refrigerant flow can be further minimized.

The gasket retainer2790further includes a bead portion2792protruding toward the valve plate2730on the circumference thereof, more precisely, on the circumference of the body portion2791. As shown inFIG.5, when the injection valve assembly2700is assembled, the bead portion2792is disposed on the radially outer side of the injection valve2720. As such, the gasket retainer2790is coupled to the second surface138bof the partition wall and surrounds the stepped portion, and the bead portion2792is formed on the circumference, so that the bead portion2792is pressed between the partition wall138and the valve plate2730by the fastening force of the fastening bolt770and sealing is made between the partition wall138and the valve plate2730.

Specifically, the bead portion2792includes an outer inclined bead portion2792aon the radially outer side thereof, an inner inclined bead portion2792bon the radially inner side thereof, and a protruding bead portion2792cconnecting the outer inclined bead portion2792aand the inner inclined bead portion2792b. In the embodiment, the outer inclined bead portion2792aand the inner inclined bead portion2792bextend to the same height, so that the protruding bead portion2792cis formed in a flat shape. As a result, the outer inclined bead portion2792amay be compressed between the second surface138bof the partition wall and the valve plate2730during the assembly, and the inner inclined bead portion2792bmay be compressed between the first surface138aof the partition wall and the valve plate2730during the assembly.

The gasket retainer2790further includes a fourth fastening hole2797through which the fastening bolt770passes, and a third positioning hole2798that communicates with the second positioning hole2727and through which the positioning pin passes. Here, the bead portion2792surrounds the fourth fastening hole2797in order to support and evenly transmit the fastening force generated by the fastening bolt770. Specifically, the fourth fastening hole2797is formed more inward in the radial direction than the outer inclined bead portion2792aand is formed at a position overlapping the inner inclined bead portion2792b. However, when the inner inclined bead portion2792bpasses through the fourth fastening hole2797, the inner inclined bead portion2792bdetours radially inward and is arranged to surround the fourth fastening hole2797.

Next, as shown inFIGS.3and9, the valve plate2730is formed as a circular plate, and includes a pair of inclined spaces2734aand2734bon which the pair of retainer portions2794aand2794bis seated and which receives the refrigerant introduced through the pair of inlets2712aand2712b, and the pair of outlets2736aand2736bthat communicates with the pair of inclined spaces and through which the refrigerant flows out. That is, the first retainer portion2794ais seated on the first inclined space2734a, and the refrigerant introduced through the first inlet2712ais received in the first inclined space2734aand flows out through the first outlet2736a. Also, the second retainer portion2794bis seated on the second inclined space2734b, and the refrigerant introduced through the second inlet2712bis received in the second inclined space2734band flows out through the second outlet2736b. The first inclined space2734aand the second inclined space2734bare concavely formed to have an inclination corresponding to the first retainer portion2794aand the second retainer portion2794b, and are formed parallel to each other.

The valve plate2730further includes a first protrusion2732aand a second protrusion2732bwhich protrude toward the injection port of the fixed scroll500. The first outlet2736apasses through the first protrusion2732afrom the first inclined space2734a, and the second outlet2736bpasses through the second protrusion2732bfrom the second inclined space2734b. As a result, the refrigerant flowing out of the outlet2736may be supplied to the compression chamber C through the injection port of the fixed scroll500.

Here, such that the refrigerant flowing through the flow hole2796can flow out directly to the outlet2736without pressure loss, it is preferable that the first outlet2736ashould be disposed at a position corresponding to the first flow hole2796aand the second outlet2736bshould be disposed at a position corresponding to the second flow hole2796b.

The valve plate2730further includes a fifth fastening hole2737through which the fastening bolt770passes, and a fourth positioning recess2739that communicates with the third positioning hole2798and into which the positioning pin is inserted. The fifth fastening hole2737of the valve plate is disposed on the radially outer side of the inclined space2734.

Accordingly, the positioning pin passes through the first positioning hole2716, the second positioning hole2727, and the third positioning hole2798and is inserted into the fourth positioning recess2739, so that the cover plate2710, the injection valve2720, the gasket retainer2790, and the valve plate2730can be aligned.

Also, the fastening bolt770passes through the fifth fastening hole2737and the fourth fastening hole2797and is fastened to the first fastening recess139through the third fastening recess2728and the second fastening recess2714, so that the injection valve assembly2700may be fastened to the rear housing130.

Here, since the fastening bolt770is disposed on the introduction chamber I side, specifically on the first surface138aof the partition wall, there is a concern that the refrigerant leaks through the space through which the fastening bolt770passes. For the purpose of preventing this, the injection valve assembly may be provided with a sealing portion which seals between the injection valve assembly2700and a head of the fastening bolt770.

In the embodiment, as shown inFIGS.3and5, the sealing portion2738is provided on one surface of the valve plate2730where the head of the fastening bolt770is seated, and the sealing portion2738protrudes to surround the fifth fastening hole2737of the valve plate. Accordingly, the fastening bolt770may be strongly engaged with the sealing portion2738as being fastened, and sealing may be made between the head of the fastening bolt770and one surface of the valve plate2730. Therefore, it is possible to prevent refrigerant leakage.

However, the embodiment is not limited to this, and it is possible that the sealing portion may be formed of a separate O-ring, etc., and may be inserted between the head of the fastening bolt770and one side of the valve plate2730and compressed when the fastening bolt is tightened.

Next, a gasket retainer3790according to another embodiment of the present disclosure will be described with reference toFIGS.10and11.

As described above, the gasket retainer3790includes a fourth fastening hole3797through which the fastening bolt770passes, and a pair of retainer portions3794aand3794bthat is inclined in a direction in which the injection valve opens, that is, toward the valve plate.

However, in the embodiment, the pair of retainer portions3794aand3794bis processed on the gasket retainer3790in such a manner as to be inclined by a cutting portion. Specifically, an inner portion of a body portion3791of the gasket retainer3790cut by the U-shaped cutting portion is processed as the retainer portion3794. Here, a pair of wing portions3795connecting both sides of the retainer portion3794and the body portion3791facing them is provided on both sides of each of the retainer portions3794in order to maintain the inclination angle of the retainer portion. Accordingly, a U-shaped main flow hole3796cmay be formed on one side of the pair of wing portions3795, and a pair of straight auxiliary flow holes3796dmay be formed on the other side. As a result, when the injection valve is opened, the refrigerant flowing into the inlet of the cover plate can flow into the inclined space of the valve plate through the main flow hole3796cand the pair of auxiliary flow holes3796d.

Here, the gasket retainer3790may include a first bead portion3792d, a second bead portion3792e, and a valve bead portion3792f. The first bead portion3792dextends along a radial outer circumference of the fourth fastening hole3797and protrudes toward the cover plate. The second bead portion3792eextends along a radial inner circumference of the fourth fastening hole3797and protrudes toward the cover plate. The valve bead portion3792fis provided in each of the retainer portions3794and protrudes toward the valve plate. That is, while the first bead portion3792dand the second bead portion3792eprotrude in the same direction, the valve bead portion3792fprotrudes in the opposite direction to the first bead portion3792dand the second bead portion3792e.

Here, the height and width, etc., of the bead portion may be set differently according to the importance of leakage. The first bead portion3792dis the most important bead for preventing leakage by a high discharge pressure from the discharge chamber D. Also, the second bead portion3792eis used to prevent the refrigerant from flowing backward when a pressure in the compression chamber C becomes higher than a pressure in the introduction chamber I as the scroll rotates. Accordingly, the protrusion height of the first bead portion3792dcan be formed to be greater than the protrusion height of the second bead portion3792e(seeFIG.13). Moreover, the width of the first bead portion3792dcan also be formed to be greater than the width of the second bead portion3792e. Accordingly, the axial force of the fastening bolt770can be further applied to the first bead portion3792d, thereby enabling reliable sealing.

Unlike the first bead portion3792dand the second bead portion3792e, the valve bead portion3792fis not designed for sealing but for accurately determining (supporting) a bending point of the injection valve. For this purpose, it is desirable that the valve bead portion3792fshould be provided in the retainer portion3794at a point where the inclination of the retainer portion3794starts. Accordingly, the valve bead portion3792fcan press a point where the bending of the valve portion of the injection valve starts, that is, a portion that can be a reference point during the bending. In the embodiment, the valve bead portion3792fis provided between the pair of auxiliary flow holes3796din a direction crossing the width of the retainer portion3794.

In particular, unlike the first bead portion3792dand the second bead portion3792e, the valve bead portion3792fprotrudes toward the valve plate. Therefore, when the valve portion of the injection valve is completely opened, the entire area of the valve portion can come into uniform contact with the retainer portion3794of the gasket retainer, so that the valve portion can be stably supported (seeFIG.13). If the valve bead portion3792fprotrudes toward the cover plate in the same way as the first bead portion3792dand the second bead portion3792e, the valve bead portion can press the point where the bending of the valve portion starts. However, when the valve portion is opened, the valve portion unstably contact with the surface of the retainer portion3794, and thus, there may be a risk that the valve portion is damaged.

Here, the protrusion height of the valve bead portion3792fmay be the same as the protrusion height of the second bead portion3792e. In this case, the protrusion height of the first bead portion3792dmay be greater than the protrusion height of the second bead portion3792eand the protrusion height of the valve bead portion3792f(seeFIG.13).

Next, an injection valve3720according to another embodiment of the present disclosure will be described with reference toFIG.12.

As described above, the injection valve3720includes a pair of valve portions3721aand3721bthat is bent to open and close the inlet. However, in the embodiment, the pair of valve portions3721aand3721bcorresponds to an inner portion cut by the cutting portion in a body portion3726of the injection valve3720, and can be bent with respect to the body portion3726.

When the injection valve assembly is compactified, the length of the valve portion3721of the injection valve is also reduced. When the length of the valve portion is reduced, the power required to open the valve portion increases. Also, when the width of the valve portion3721is reduced in order to reduce power consumption, there is a risk that the action of the valve portion is unstable and distortion occurs when the valve portion is opened and closed.

For the purpose of solving this problem, in the embodiment, each of the pair of valve portions3721aand3721bis provided with a hole3729extending in the longitudinal direction. In the embodiment, the hole3729is provided in the middle of the valve portion3721in the width direction and extends from the point where the bending of the valve portion3721starts to approximately the middle in the longitudinal direction. That is, the overall width of the valve portion3721is maintained wide, and the hole3729divides the width of the valve portion3721into two branches, making the width of a portion connected to the body portion3726smaller, thereby reducing the power required to lift the valve portion3721.

Accordingly, even within a compact package, it is possible to prevent distortion and reduce the power during the opening and closing operation of the injection valve3720.

FIG.13is a cross-sectional view showing the injection valve assembly including the gasket retainer3790ofFIG.10and the injection valve3720ofFIG.12is assembled to the rear housing130. The structure described above may be applied to the valve plate and the cover plate of the injection valve assembly in the same manner.

Referring toFIG.13, it can be seen that the valve bead portion3792fprotrudes in the opposite direction to the first bead portion3792dand the second bead portion3792e. Also, it can be seen that the height and width of the first bead portion3792dare formed to be greater than those of the second bead portion3792eand the valve bead portion3792f.

The present invention is not limited to the described specific embodiments and descriptions described above. Various modifications can be made by anyone skilled in the art without departing from the subject matter of the present invention as defined by the appended claims. Such modifications fall within the scope of protection of the present invention.

INDUSTRIAL APPLICABILITY

The present disclosure relates to a scroll compressor and more particularly to a scroll compressor capable of improving the performance and efficiency of the compressor by increasing the amount of refrigerant discharged from a compression chamber by introducing not only refrigerant at suction pressure but also refrigerant at an intermediate pressure to the compression chamber of the scroll compressor, capable of freely changing the position of a port by simplifying the shape of an injection valve assembly and by disposing a fastening member on an introduction chamber side, and capable of compactifying the injection valve assembly.