Scroll Compressor

Abstract

To provide a scroll compressor capable of preventing deformation of a gasket retainer of an injection valve assembly.SOLUTION: A scroll compressor includes a housing, a motor, a rotor shaft, a revolving scroll driven to revolve, and a fixed scroll which forms a compression chamber with the revolving scroll. The housing includes a rear housing which forms a discharge chamber for accommodating a coolant. A cover plate having an inlet into which the coolant of an introduction chamber flows, a valve plate fixed to the cover plate and having an outlet from which the coolant flowing in via the inlet flows out, a gasket retainer interposed between the cover plate and the valve plate to prevent leakage of the coolant, and an injection valve interposed between the cover plate and the gasket retainer to open and close the inlet are disposed between the fixed scroll and the rear housing. The valve plate has a pressure surface increasing part formed to protrude toward the injection valve.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a scroll compressor, and more particularly to a scroll compressor in which the surface pressure can be increased at a position in an injection valve assembly where support for the injection valve is required, the bead height of a gasket retainer can be reduced, and deformation of the gasket retainer can be prevented. [Background technology]

[0002] Generally, automobiles are equipped with air conditioning (A / C) systems for heating and cooling the interior of the vehicle. Such air conditioning systems include a compressor that compresses low-temperature, low-pressure gaseous refrigerant drawn from an evaporator into high-temperature, high-pressure gaseous refrigerant and sends it to a condenser. There are two types of compressors: reciprocating compressors, which compress refrigerant by the reciprocating motion of pistons, and rotary compressors, which compress refrigerant by rotary motion. Reciprocating compressors include crank compressors, which use a crank to transmit power to multiple pistons, and swash plate compressors, which transmit power to a shaft equipped with a swash plate. Rotary compressors include vane rotary compressors, which use a rotating rotary shaft and vanes, and scroll compressors, which use an orbiting scroll and a fixed scroll. Scroll compressors have the advantage of being able to achieve a relatively high compression ratio compared to other types of compressors, and of being able to obtain stable torque through a smooth connection between the suction, compression, and discharge strokes of the refrigerant. As a result, they are widely used to compress refrigerants in air conditioners and other equipment. In the conventional scroll compressor disclosed in Patent Document 1, only refrigerant at suction pressure is drawn into the compression chamber, compressed, and then discharged to the outside. However, in such a conventional scroll compressor, the amount of refrigerant discharged from the compression chamber is fixed, which limits the improvement of the compressor's performance and efficiency. To solve this problem, Patent Document 2 discloses a scroll compressor equipped with an injection valve assembly (700) including an injection valve and leakage prevention means for opening and closing an injection passage that guides intermediate-pressure refrigerant flowing from outside the compressor to a compression chamber (C), as shown in FIGS. 1 and 2.

[0003] Specifically, inlet valve assembly 700 includes cover plate 710, inlet valve 720, valve plate 730, and leak-proof gasket retainer 790. Gasket retainer 790 is compressed between cover plate 710 and valve plate 730 to form a seal therebetween, thereby securing inlet valve 720 by squeezing it together between cover plate 710 and gasket retainer 790. To this end, the gasket retainer 790 includes a bead portion 792 that protrudes from the upper surface of the gasket retainer toward the cover plate 710. At this time, the protruding height (h) of the bead portion 792 is formed to be greater than or equal to the thickness (t) of the injection valve 720. In particular, the injection valve (720) must be clearly supported at the end where the connecting portion (726) is connected to the first leg (724a) and at the end where the connecting portion (726) is connected to the second leg (724b) in order for the valve to open / close. However, as shown in Figure 2, the surface of the valve plate (730) that supports the gasket retainer (790) consists of a single plane, excluding the inclined space (734). As a result, even if the gasket retainer (790) is compressed between the cover plate (710) and the valve plate (730), sufficient surface pressure may not be generated at the position where support for the injection valve (720) is required. In addition, since the protruding height (h) of the bead portion (792) must be greater than or equal to the thickness (t) of the injection valve (720), there is a problem that the high bead portion may press down and cause unintended deformation of the gasket retainer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Korean Patent No. 2018-0094483 [Patent Document 2] Korean Patent No. 2021-0118743 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a scroll compressor in which the surface pressure in the injection valve assembly can be increased at a position where support for the injection valve is required, the bead height of the gasket retainer can be reduced, and deformation of the gasket retainer can be prevented. The technical problems that the present invention aims to achieve are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from the following description. [Means for solving the problem]

[0006] a fixed scroll that forms a compression chamber together with the orbiting scroll, the housing including a rear housing that defines a discharge chamber for receiving refrigerant discharged from the compression chamber; an injection valve assembly that defines an introduction chamber in the rear housing through which refrigerant flows from outside the housing and guides the refrigerant in the introduction chamber to the compression chamber between the fixed scroll and the rear housing; the injection valve assembly including: a cover plate coupled to the rear housing and having an inlet through which the refrigerant in the introduction chamber flows; a valve plate coupled to the cover plate and having an outlet through which the refrigerant flowing in through the inlet flows out; a gasket retainer interposed between the cover plate and the valve plate to prevent refrigerant leakage; and an injection valve interposed between the cover plate and the gasket retainer to open and close the inlet, the valve plate including a surface pressure increasing portion that protrudes toward the injection valve.

[0007] The surface pressure increasing portion may be provided on a surface of the valve plate facing the gasket retainer, and the gasket retainer may support at least a portion of the injection valve. The injection valve may include a head portion that opens and closes the inlet, and a leg portion that extends from the head portion and performs the opening and closing operation, and the surface pressure increasing portion may be provided at a position facing the end of the leg portion on the opposite side from the head portion. The inlet may be a plurality of inlets, the head and leg of the injection valve may each be a plurality of inlets, the injection valve may further include a connecting portion connecting the plurality of leg portions, and the surface pressure increasing portion may further be provided at a position opposite at least a portion of the connecting portion.

[0008] The surface pressure increasing portion may be formed on an integrally connected surface. The surface pressure increasing portion may be formed on a plurality of surfaces spaced apart from each other and facing the ends of the leg portions opposite the head portion and at least a part of the connecting portion.

[0009] The plurality of inlets include a first inlet and a second inlet formed independently of the first inlet, the plurality of heads include a first head for opening and closing the first inlet and a second head for opening and closing the second inlet, the plurality of legs include a first leg extending from the first head for performing an opening and closing operation and a second leg extending from the second head for performing an opening and closing operation, the connecting portion connects the first leg and the second leg, and the surface pressure increasing portion may include a first surface pressure increasing portion provided at a position facing an end portion of the first leg to which the connecting portion is connected, a second surface pressure increasing portion provided at a position facing an end portion of the second leg to which the connecting portion is connected, and a connecting surface pressure increasing portion provided at a position facing at least a portion of the connecting portion.

[0010] The first surface pressure increasing portion may be formed to extend in a width direction of the first leg portion, and the second surface pressure increasing portion may be formed to extend in a width direction of the second leg portion, and the first surface pressure increasing portion and the second surface pressure increasing portion may be arranged parallel to each other and spaced a predetermined distance apart.

[0011] The valve plate may include an inclined space recessed in a base surface on which the surface pressure increasing portions are protruded, and the first and second surface pressure increasing portions may have a surface roughness lower than that of the inclined space. The valve plate may include a positioning groove into which a positioning pin is inserted, and the surface pressure increasing portion may include an avoiding portion recessed to avoid the positioning groove. A step may be formed around the surface of the valve plate facing the gasket retainer. The step may be formed by a step-forming surface that protrudes from a surface of the surface pressure increasing portion at a radially outer side of the surface pressure increasing portion. The gasket retainer may include a retainer portion that is beveled toward an opening direction of the injection valve and a bead portion that protrudes from one surface and surrounds the retainer portion, and the bead portion may face the step-forming surface.

[0012] and a fixed scroll that forms a compression chamber together with the orbiting scroll. The housing includes a rear housing that defines a discharge chamber that receives refrigerant discharged from the compression chamber. An injection valve assembly is provided between the fixed scroll and the rear housing to define an introduction chamber in the rear housing through which refrigerant flows from outside the housing and to guide the refrigerant from the introduction chamber to the compression chamber. The injection valve assembly includes: a cover plate coupled to the rear housing and having an inlet through which the refrigerant from the introduction chamber flows; a valve plate coupled to the cover plate and having an outlet through which the refrigerant flowed through the inlet flows out; a gasket retainer interposed between the cover plate and the valve plate to prevent refrigerant leakage; and an injection valve interposed between the cover plate and the gasket retainer to open and close the inlet. A step is formed around a surface of the valve plate facing the gasket retainer. [Effects of the Invention]

[0013] According to the present invention, by introducing not only suction pressure refrigerant but also intermediate pressure refrigerant into the compression chamber of the scroll compressor, the amount of refrigerant discharged from the compression chamber can be increased, thereby improving the performance and efficiency of the compressor. In addition, by forming a surface pressure increasing portion on the valve plate, the surface pressure can be increased at the position where support of the injection valve is required in the injection valve assembly, i.e., at the start of the valve opening / closing operation, thereby clearly supporting the injection valve. Furthermore, by forming a step around the valve plate that is higher than the surface pressure increasing portion, the bead height of the gasket retainer can be lowered, and deformation of the gasket retainer can be prevented. It should be understood that the effects of the present invention are not limited to the effects described above, but include all effects that can be inferred from the configuration of the invention described in the detailed description of the present invention or the claims. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a cross-sectional view illustrating a conventional scroll compressor. [Figure 2] FIG. 2 is an exploded perspective view illustrating the injection valve assembly of FIG. 1 separated. [Figure 3] 1 is an exploded perspective view illustrating an injection valve assembly of a scroll compressor according to one embodiment of the present invention; FIG. [Figure 4] FIG. 4 is a rear perspective view illustrating the valve plate in FIG. 3 with the valve plate separated. [Figure 5] FIG. 4 is a rear perspective view illustrating the gasket retainer in FIG. 3 with the gasket retainer separated. [Figure 6] FIG. 6 is a plan view of FIG. 5. [Figure 7] 4 is a plan view illustrating the injection valve assembly of FIG. 3 fastened to the rear housing. FIG. [Figure 8] 8 is a cross-sectional view taken along the line AA' in FIG. 7. [Figure 9]FIG. 8 is a cross-sectional view taken along the line BB′ in FIG. 7. DETAILED DESCRIPTION OF THE INVENTION

[0015] A scroll compressor according to the present invention will now be described with reference to the accompanying drawings. Furthermore, the terms used below are defined in consideration of their functions in the present invention, and may vary depending on the intentions or practices of users or operators. The following examples do not limit the scope of the present invention, but are merely illustrative examples of the elements presented in the claims of the present invention. In order to clearly explain the present invention, parts that are not relevant to the description will be omitted, and the same reference numerals will be used throughout the specification to refer to the same or similar components. Throughout the specification, when a part "includes" a certain component, this does not mean that other components are excluded, but that other components may also be included, unless otherwise specified.

[0016] The scroll compressor of the present invention includes a housing 100, a motor 200 provided within the housing 100, a rotary shaft 300 rotated by the motor 200, an orbiting scroll 400 orbiting in conjunction with the rotary shaft 300, a fixed scroll 500 forming a compression chamber C together with the orbiting scroll 400, and a discharge valve 600 disposed on one surface of the fixed scroll 500 for opening and closing a discharge port 512 of the fixed scroll through which refrigerant compressed in the compression chamber C is discharged. Here, the same reference numerals are used for the same components as those of the scroll compressor of Patent Document 2 shown in FIGS. 1 and 2, and detailed description of the same components will be omitted.

[0017] The scroll compressor further includes an injection valve assembly (2700) for forming an injection passage that introduces intermediate-pressure refrigerant from the outside of the housing (100) (e.g., downstream of the condenser in a vapor compression refrigeration cycle including the scroll compressor, condenser, expansion valve, and evaporator) into the compression chamber (C) and for opening and closing the injection passage.

[0018] The housing (100) includes a center housing (110) through which the rotary shaft (300) passes, a front housing (120) forming a motor accommodating space in which the motor (200) is accommodated, and a rear housing (130) forming a discharge chamber (D) for accommodating refrigerant discharged from the compression chamber (C), and the injection valve assembly (2700) may be interposed between the fixed scroll (500) and the rear housing (130). The injection valve assembly (2700) defines an introduction chamber (I) in the rear housing (130) through which refrigerant flows from outside the housing, and guides the refrigerant in the introduction chamber (I) to the compression chamber (C).

[0019] 3, the injection valve assembly 2700 includes a cover plate 710 coupled to the rear housing 130 and having an inlet 712 through which refrigerant from the inlet chamber I flows in, a valve plate 2730 coupled to the cover plate 710 and having an outlet 736 through which the refrigerant flowing in through the inlet 712 flows out, a gasket retainer 2790 interposed between the cover plate 710 and the valve plate 2730 to prevent refrigerant leakage, and an injection valve 720 interposed between the cover plate 710 and the gasket retainer 2790 to open and close the inlet 712. Here, the same reference numerals are used for components that are the same as those in the scroll compressor of Prior Art 2, and detailed descriptions of the same components will be omitted. That is, the configurations of the cover plate 710 and the injection valve 720 are the same as those in the scroll compressor of Prior Art 2.

[0020] 3 and 4, the valve plate 2730 can have the same protrusion 732, inclined space 734, outlet 736, first fastening hole 739a, and second positioning groove 739b as the valve plate 730 of Prior Art Document 2, but differs in that a surface pressure increasing portion 2738 and a step are formed on the surface of the valve plate 2730 facing the gasket retainer 2790. That is, the surface of the valve plate 730 of Prior Art Document 2 facing the gasket retainer 790 is flat except for the inclined space 734, but the surface of the valve plate 2730 of this embodiment facing the gasket retainer 2790 has three surfaces of different heights, excluding the inclined space 734. In the following description, the surface of the valve plate (2730) facing the gasket retainer (2790) will be referred to as the top surface, and the opposite surface will be referred to as the back surface.

[0021] Specifically, the upper surface of the valve plate 2730 is formed with a base surface 2737 in which the inclined space 734 is recessed. The upper surface of the valve plate 2730 is also provided with a surface pressure increasing portion 2738 that protrudes from the base surface 2737 toward the injection valve 720. That is, the height of the base surface 2737 is lower than the surface pressure increasing portion 2738. The surface pressure increasing portion 2738 protrudes from the base surface 2737 to support at least a portion of the gasket retainer 2790 and the injection valve 720. In this case, it is preferable that the surface pressure increasing portion 2738 supports the starting portion of the opening / closing operation of the injection valve 720, i.e., the portion that serves as the reference point when the valve opens and closes. This increases the surface pressure at the position where support of the injection valve 720 is required, thereby enabling the injection valve to be clearly supported. Specifically, when the injection valve (720) includes a head (722) that opens and closes the inlet and a leg (724) that extends from the head (722) and performs the opening and closing operation, the surface pressure increasing portion (2738) can be provided at a position opposite the end of the leg (724) that is located on the opposite side of the head (722).

[0022] The inlet 712 is the same as in Patent Document 2, and includes a first inlet 712a and a second inlet 712b, each of which is independently connected to the introduction chamber I. In addition, in this embodiment, the head 722 and leg 724 of the injection valve 720 are also each made up of a plurality of parts, and the injection valve 720 further includes a connecting portion 726 connecting the plurality of leg portions 724. In this case, the surface pressure increasing portion 2738 may be further provided at a position opposite at least a portion of the connecting portion 726 to stably support the injection valve 720. Specifically, the injection valve (720) includes a first head (722a) that opens and closes the first inlet (712a), a first leg (724a) that extends from the first head (722a) and performs an opening and closing operation, a second head (722b) that opens and closes the second inlet (712b), a second leg (724b) that extends from the second head (722b) and performs an opening and closing operation, and a connecting part (726) that connects the first leg (724a) and the second leg (724b).

[0023] 3, the positions that need to be supported for the injection valve 720 are the end (portion a) of the first leg 724a where the connecting portion 726 is connected and the end (portion b) of the second leg 724b where the connecting portion 726 is connected. This is because the first head 722a bends with the portion a as a reference point to open and close the first inlet 712a, and the second head 722b bends with the portion b as a reference point to open and close the second inlet 712b. Therefore, the surface pressure increasing portion 2738 can support the portions a and b of the injection valve 720, including a first surface pressure increasing portion 2738a provided at a position opposite the portion a and a second surface pressure increasing portion 2738b provided at a position opposite the portion b. In this case, the first surface pressure increasing portion 2738a is formed to extend in the width direction of the first leg portion 724a, and the second surface pressure increasing portion 2738b is formed to extend in the width direction of the second leg portion 724b. In particular, the first surface pressure increasing portion 2738a and the second surface pressure increasing portion 2738b may be arranged parallel to each other at a predetermined distance apart.

[0024] The surface pressure increasing portion 2738 also includes a connecting surface pressure increasing portion 2738c disposed at a position facing at least a portion of the connecting portion 726. The connecting surface pressure increasing portion 2738c may be disposed along the length of the connecting portion 726 between the first surface pressure increasing portion 2738a and the second surface pressure increasing portion 2738b, which are spaced apart by a predetermined distance. That is, the surface pressure increasing portion 2738 may be disposed at a position facing the portions a and b, and may also be disposed at a position across the injection valve. In this embodiment, the surface pressure increasing portion 2738 is formed at the same height and is formed as a single, connected surface. That is, the first surface pressure increasing portion 2738a, the second surface pressure increasing portion 2738b, and the connecting surface pressure increasing portion 2738c are connected as a single unit. However, the present invention is not limited to this, and the surface pressure increasing portion 2738 may be formed as a plurality of surfaces spaced apart from each other. That is, the first surface pressure increasing portion 2738a, the second surface pressure increasing portion 2738b, and the connecting surface pressure increasing portion 2738c may be provided spaced apart from each other. In addition, the surface pressure increasing portion 2738 may be provided with an avoiding portion 2738d formed by being recessed to avoid the second positioning groove 739b.

[0025] The first and second surface pressure increasing portions 2738a, 2738b may have a lower surface roughness than the inclined space 734. The inclined space 734 does not require precision machining and can be formed on the surface of the material itself, but the first and second surface pressure increasing portions 2738a, 2738b must be formed by precision machining because they need to increase the surface pressure evenly and consistently and it is important to minimize tolerances. Furthermore, a surface pressure increasing portion 2738 may be formed on the upper surface of the valve plate 2730, and a step may be formed around the surface. In this case, the step may be formed by a step forming surface 2739 that protrudes from the surface of the surface pressure increasing portion 2738 at the radially outer side of the surface pressure increasing portion 2738. As a result, the surface of the valve plate (2730) facing the gasket retainer (2790) decreases in height in the order of the stepped surface (2739), the surface pressure increasing portion (2738), and then the base surface (2737). Here, the stepped surface 2739 faces a bead portion 2792 of a gasket retainer 2790, which will be described later. Therefore, when the injection valve assembly 2700 is fastened to the rear housing 130 by the fastening bolts 770, the stepped surface 2739 presses and deforms the bead portion 2792, generating surface pressure to seal the gap between the valve plate 2730 and the cover plate 710.

[0026] Additionally, the inner portion of the gasket retainer (2790) and the injection valve (720) can be mounted in the cavity formed inside the step-forming surface (2739). By mounting the inner portion of the gasket retainer (2790) and the injection valve (720) in the cavity in this manner, the height of the bead portion (2792) can be reduced, in accordance with Prior Art Document 2, which requires that the protruding height (h) of the bead portion (792) be greater than or equal to the thickness (t) of the injection valve (720). This prevents deformation of the gasket retainer (2790) and is advantageous for forming the gasket retainer and maintaining bolt tightening force. This will be explained in more detail below along with the explanation of the gasket retainer (2790).

[0027] 5 and 6, the gasket retainer (2790) includes a retainer portion (794) beveled in the direction in which the injection valve (720) is opened, and a plurality of third fastening holes (796) formed radially outward of the retainer portion (794) so ​​that the fastening bolts (770) can be inserted, similar to Prior Art Document 2. However, there are differences in that the bead portion (2792) includes a first half-bead (2792a) and a second half-bead (2792b), and the shapes of the main flow hole (2790c) and a pair of auxiliary flow holes (2790d, 2790e) are different. Specifically, the bead portion (2792) includes a first half-bead (2792a) that protrudes from one surface, surrounds the retainer portion (794), and extends radially inward of the plurality of third fastening holes (796), and a second half-bead (2792b) that protrudes from one surface, surrounds the first half-bead (2792a), and extends radially outward of the plurality of third fastening holes (796). Here, unlike Prior Art Document 2, the first half-bead (2792a) and the second half-bead (2792b) are formed to protrude from the lower surface (790b) of the gasket retainer facing the valve plate (2730), but are not limited to this.

[0028] At this time, in the areas separated from the plurality of third fastening holes 796, i.e., in the spaces between adjacent third fastening holes 796, the first half-bead 2792a and the second half-bead 2792b come into contact with each other to form a bulged full bead. As shown in Figures 5 and 6, when the bulged full bead extends and comes adjacent to a third fastening hole 796, it splits into the first and second half-beads 2792a and 2792b, respectively, and extends to the inside and outside of the third fastening hole 796, before reuniting and extending to form a full bead. The first half-bead (2792a) and the second half-bead (2792b) each have a quarter-circular cross-sectional shape, and in the portions spaced apart from the plurality of third fastening holes (796), the first half-bead (2792a) and the second half-bead (2792b) can contact each other to form a semicircular cross-sectional shape. In this way, since bead portions are also formed around the multiple third fastening holes (796), when the injection valve assembly (2700) is fastened to the rear housing (130) by the fastening bolts (770), the bolt fastening force can also be supported around the third fastening holes (796), minimizing deformation of the valve plate (2730). In particular, a first half bead (2792a) and a second half bead (2792b) are respectively configured around the third fastening hole (796), where the surface pressure is strong, to support the fastening bolt (770), and in the area away from the third fastening hole (796), where the surface pressure is weak, the first half bead (2792a) and the second half bead (2792b) come into contact with each other to form a full bead, thereby preventing deformation of the valve plate (2730) through uniform surface pressure.

[0029] In addition, to prevent a direct connection between the first half-bead 2792a adjacent to the end of the retainer portion 794 where the slope begins and the retainer portion 794, a hole extending to surround the outside of the end of the retainer portion 794 is formed in the gasket retainer 2790. In this embodiment, a first auxiliary flow hole 2790d (described later) serves as the hole extending to surround the outside of the end of the retainer portion 794. As a result, deformation caused by the bead portion 2792 being pressed is not transmitted to the inner portion supporting the injection valve 720. Specifically, the retainer portion (794) is beveled by cutting into the body of the gasket retainer (2790) as in Prior Art Document 2, but the gasket retainer (2790) further includes a pair of wings (795) connecting both sides of the retainer portion (794) to the body of the gasket retainer (2790) facing each other in order to maintain the angle of inclination of the retainer portion (794). At this time, it is preferable that the pair of wings (795) be connected to both sides of the other end of the retainer portion (794) opposite the end where the inclination begins. In this way, the bead portion (2792) is not directly connected to one end of the retainer portion (794) that supports the starting point (reference point) where the opening / closing operation of the injection valve (720) occurs, so deformation is not transmitted, and the pair of wing portions (795) are connected to the other end of the retainer portion (794) with minimal connection, so the injection valve (720) can be clearly supported.

[0030] A main flow hole 2790c having an approximately U-shape is formed on one side of the pair of wings 795, surrounding the other end of the retainer part 794, and a pair of auxiliary flow holes 2790d, 2790e are formed on the other side, extending along the length of the retainer part 794. In this case, the first auxiliary flow hole 2790d, which is located on the outer side of the pair of auxiliary flow holes, extends longer than the second auxiliary flow hole 2790e, which is located on the inner side, and surrounds the outside of one end of the retainer part 794. That is, as shown in FIG. 6, the second auxiliary flow hole 2790e extends in a straight line along the length of the retainer part 794, while the first auxiliary flow hole 2790d can extend in a straight line along the length of the retainer part 794 and then bend and extend further. The first secondary flow hole (2790d) can be co-linear with or extend beyond the second secondary flow hole (2790e).

[0031] Specifically, the retainer portion 794 includes a first retainer portion 794a and a second retainer portion 794b spaced apart from each other. In this case, the first auxiliary flow hole 2790d of the first retainer portion 794a may extend in a straight line along the length of the first retainer portion 794a and then curve toward the main flow hole 2790c of the second retainer portion 794b, and the first auxiliary flow hole 2790d of the second retainer portion 794b may extend in a straight line along the length of the second retainer portion 794b and then curve toward the main flow hole 2790c of the first retainer portion 794a. In some cases, the main flow hole 2790c may extend at least partially around the circumference of the gasket retainer 2790, such as the main flow hole 2790c located at the bottom in Fig. 6. In this embodiment, the gasket retainer 2790 is described as having a different structure from the gasket retainer 790 of prior art 2, but it is not limited thereto, and it goes without saying that the gasket retainer 790 of prior art 2 may also be applied.

[0032] Finally, the state in which the injection valve assembly 2700 of this embodiment is coupled to the rear housing 130 will be described with reference to Figures 7 to 9. Figure 8 is a cross-sectional view of a portion separated from the fastening bolt 770, and Figure 9 is a cross-sectional view of a portion where the fastening bolt 770 is fastened. 8, the first half-bead 2792a and the second half-bead 2792b of the gasket retainer 2790 meet to form a full bead at the portion spaced from the fastening bolt 770. Also, the first auxiliary flow hole 2790d prevents the retainer portion 794 from being directly connected to the bead portion 2792, so deformation of the bead portion 2792 is not transmitted to the retainer portion 794, resulting in the retainer portion 794 remaining flat. The inner portion of the gasket retainer 2790 and the injection valve 720 are installed in a cavity formed inside the stepped surface 2739 of the valve plate 2730. 9, it can be seen that the first half-bead 2792a and the second half-bead 2792b of the gasket retainer 2790 are formed on the inside and outside of the fastening bolt 770 at the portion where the fastening bolt 770 is fastened, thereby supporting the valve plate 2730 and minimizing deformation. As a result, deformation of the valve plate 2730 and the gasket retainer 2790 is minimized, and the injection valve 720 is clearly supported, resulting in stable operation. The present invention is not limited to the specific embodiments and explanations described above, and various modifications can be made by a person having ordinary knowledge in the technical field to which the present invention pertains without departing from the gist of the present invention as claimed in the claims, and such modifications are within the scope of protection of the present invention. [Explanation of symbols]

[0033] 100: Housing 110: Center housing 120: Front housing 130: Rear housing 200:Motor 300: Rotation axis 400: Rotating scroll 500: Fixed scrolling 2700: Injection valve assembly 710: Cover plate 712:Inlet 720: Injection valve 722: Head 724: Legs 726: Connection part 2730: Valve plate 732:Protrusion 734: Inclined space 736: Outlet 2737: Base surface 2738: Increased surface pressure 2738a: First pressure increasing section 2738b: Second pressure increasing section 2738c: Connection surface pressure increasing part 2738d: Evasion part 2739: Step-forming surface 739a: First closing hole 739b: 2nd positioning groove 770: Fastening bolt 2790: Gasket retainer 2790c: Main Flow Hall 2790d: First auxiliary flow hole 2790e: Second auxiliary flow hall 2792: Bead part 2792a: 1st half-bead 2792b: 2nd Half-Bead 794: Retainer part 795: Wings 796: 3rd closing hole

Claims

1. housing, a motor disposed within the housing; a rotation shaft rotated by the motor; an orbiting scroll that orbits in conjunction with the rotation shaft; a fixed scroll that forms a compression chamber together with the orbiting scroll; the housing includes a rear housing that forms a discharge chamber that accommodates refrigerant discharged from the compression chamber; an injection valve assembly is provided between the fixed scroll and the rear housing to define an introduction chamber into the rear housing, through which a refrigerant flows from outside the housing, and to guide the refrigerant in the introduction chamber to the compression chamber; The injection valve assembly includes: a cover plate coupled to the rear housing and having an inlet through which the refrigerant from the introduction chamber flows; a valve plate coupled to the cover plate and having an outlet through which the refrigerant flowing in through the inlet flows out; a gasket retainer interposed between the cover plate and the valve plate to prevent leakage of refrigerant; and an injection valve interposed between the cover plate and the gasket retainer for opening and closing the inlet; a base surface having a recessed inclined space formed on a surface of the valve plate facing the gasket retainer; the valve plate is provided with a surface pressure increasing portion that protrudes from the base surface toward the injection valve, The base surface is formed to have a height lower than that of the surface pressure increasing portion, The surface pressure increasing portion is provided on a surface of the valve plate facing the gasket retainer, and at least partially supports the gasket retainer and the injection valve.

2. The injection valve is a head portion for opening and closing the inlet; Legs extending from the head for opening and closing are included, 2. The scroll compressor according to claim 1, wherein the surface pressure increasing portion is provided at a position opposite to the head portion and facing the end of the leg portion.

3. The inlet port is made up of a plurality of pieces, and the head and leg portions of the injection valve are made up of a plurality of pieces, respectively; The injection valve further includes a connecting portion connecting the plurality of legs, The scroll compressor according to claim 2 , wherein the surface pressure increasing portion is further provided at a position facing at least a part of the connecting portion.

4. 4. The scroll compressor according to claim 3, wherein the surface pressure increasing portion is formed on an integrally connected surface.

5. 4. The scroll compressor according to claim 3, wherein the surface pressure increasing portion is formed on a plurality of surfaces spaced apart from each other at positions facing the end of the leg portion opposite the head portion and at least a portion of the connecting portion.

6. the plurality of inlets includes a first inlet; and a second inlet formed independently of the first inlet; the plurality of heads include a first head that opens and closes the first inlet and a second head that opens and closes the second inlet, and the plurality of leg portions include a first leg portion that extends from the first head and performs an opening and closing operation, and a second leg portion that extends from the second head and performs an opening and closing operation, the connecting portion connects the first leg portion and the second leg portion, The surface pressure increasing portion is a first surface pressure increasing portion provided at a position facing an end portion of the first leg portion to which the connecting portion is connected; a second surface pressure increasing portion provided at a position opposite to an end portion to which the connecting portion of the second leg is connected; and 4. The scroll compressor according to claim 3, further comprising a connecting surface pressure increasing portion provided at a position facing at least a part of the connecting portion.

7. the first surface pressure increasing portion is formed to extend in a width direction of the first leg portion, and the second surface pressure increasing portion is formed to extend in a width direction of the second leg portion, 7. The scroll compressor according to claim 6, wherein the first surface pressure increasing portion and the second surface pressure increasing portion are arranged parallel to each other and spaced apart by a predetermined distance.

8. 7. The scroll compressor according to claim 6, wherein the first and second surface pressure increasing portions have a surface roughness lower than that of the inclined space.

9. the valve plate includes a positioning groove into which a positioning pin is inserted; 2. The scroll compressor according to claim 1, wherein the surface pressure increasing portion is provided with a recessed avoiding portion for avoiding the positioning groove.

10. 2. The scroll compressor according to claim 1, wherein a step is formed around the periphery of the surface of the valve plate facing the gasket retainer.

11. 11. The scroll compressor according to claim 10, wherein the step is formed by a step forming surface that is formed radially outward of the surface pressure increasing portion and protrudes from the surface of the surface pressure increasing portion.

12. The gasket retainer is a retainer portion that is inclined in the direction in which the injection valve is opened; a bead portion protruding from one surface and surrounding the retainer portion, The scroll compressor according to claim 11, wherein the bead portion faces the step-forming surface.

13. housing, a motor disposed within the housing; a rotation shaft rotated by the motor; an orbiting scroll that orbits in conjunction with the rotation shaft; a fixed scroll that forms a compression chamber together with the orbiting scroll; the housing includes a rear housing that forms a discharge chamber that accommodates refrigerant discharged from the compression chamber; an injection valve assembly is provided between the fixed scroll and the rear housing to define an introduction chamber into the rear housing, through which a refrigerant flows from outside the housing, and to guide the refrigerant in the introduction chamber to the compression chamber; The injection valve assembly includes: a cover plate coupled to the rear housing and having an inlet through which the refrigerant from the introduction chamber flows; a valve plate coupled to the cover plate and having an outlet through which the refrigerant flowing in through the inlet flows out; a gasket retainer interposed between the cover plate and the valve plate to prevent leakage of refrigerant; an injection valve interposed between the cover plate and the gasket retainer for opening and closing the inlet; the valve plate includes a surface pressure increasing portion formed to protrude toward the injection valve, The valve plate includes a positioning groove into which a positioning pin is inserted, The scroll compressor is characterized in that the surface pressure increasing portion is provided with an avoiding portion formed as a recess to avoid the positioning groove.

Images