Scroll Compressor

Abstract

To provide a scroll compressor in which not only suction pressure refrigerant but also intermediate pressure refrigerant is introduced into a compression chamber of the scroll compressor to increase the amount of refrigerant discharged from the compression chamber, thereby improving the performance and efficiency of the compressor, and the shape of the injection valve assembly is simplified to make the injection valve assembly compact while freely changing the position of the port. [Solution] The compressor includes a housing, a motor, a rotating shaft, a revolving scroll, and a fixed scroll. The rear housing includes a partition wall that separates the discharge chamber and the introduction chamber. An injection valve assembly is provided between the fixed scroll and the partition wall of the rear housing to cover the introduction chamber and guide refrigerant in the introduction chamber to the compression chamber. The partition wall has first and second surfaces that surround a portion of the side surface of the injection valve assembly. A fastening member that fastens the injection valve assembly to the rear housing is positioned radially inward of the second surface.

Description

[Technical Field]

[0001] The present invention relates to a scroll compressor, and more particularly, to a scroll compressor in which not only suction pressure refrigerant but also intermediate pressure refrigerant is introduced into a compression chamber of the scroll compressor to increase the amount of refrigerant discharged from the compression chamber, thereby improving the performance and efficiency of the compressor, and in which the injection valve assembly can be made compact by simplifying the shape of the injection valve assembly and arranging a fastening member on the intake chamber side, thereby allowing the position of the port to be freely changed. [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 are part of a cooling system and include a compressor that compresses low-temperature, low-pressure gas refrigerant drawn from an evaporator into high-temperature, high-pressure gas refrigerant and sends it to a condenser.

[0003] There are two types of compressors: reciprocating compressors, which compress refrigerant by the reciprocating motion of pistons, and rotary compressors, which compress refrigerant by rotating 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 on which a swash plate is installed. 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.

[0004] 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 such, they are widely used to compress refrigerants in air conditioners and other equipment.

[0005] In the conventional scroll compressor disclosed in Prior Art 1 (Korean Patent Publication No. 2018-0094483), 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.

[0006] To solve this problem, prior art document 2 (Korea Patent Publication No. 2021-0118743) discloses a scroll compressor equipped with an injection valve assembly (700) including an injection valve for opening and closing an injection passage that guides intermediate-pressure refrigerant flowing from outside the compressor to the compression chamber (C), as shown in Figures 1 and 2, and a leakage prevention means.

[0007] Specifically, the injection valve assembly 700 includes a cover plate 710, an injection valve 720, a valve plate 730, and a gasket retainer 790 as a leakage prevention means. A fastening bolt 770 passes through a first fastening hole 739a in the valve plate, a third fastening hole 796 in the gasket retainer, and a second fastening hole 714 in the cover plate and is fastened to a fastening groove in the rear housing, thereby fastening the injection valve assembly 700 to the rear housing 130. The gasket retainer 790 is compressed between the cover plate 710 and the valve plate 730 to seal the gap, and the injection valve 720 is compressed between the cover plate 710 and the gasket retainer 790 to secure the gap.

[0008] However, the injection valve assembly 700 has a complicated shape and is difficult to rotate, which makes it difficult to change the design depending on the positions of the inlet port 133 and the outlet port 131 for each vehicle. In other words, there is little flexibility in design. Also, the fastening bolt 770 is located outside the partition wall 138 that forms the inlet chamber I, which makes the package larger. Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention aims to provide a scroll compressor that can improve the performance and efficiency of the compressor by introducing intermediate-pressure refrigerant as well as suction-pressure refrigerant into the compression chamber of the scroll compressor to increase the amount of refrigerant discharged from the compression chamber, and that can simplify the shape of the injection valve assembly, position the fastening member on the intake chamber side, and freely change the position of the port, thereby making the injection valve assembly more compact.

[0010] The technical problems that the present invention aims to achieve are not limited to the above-mentioned technical problems, 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]

[0011] One embodiment of the present invention to solve the above problem provides a scroll compressor including: a housing; a motor provided within the housing; a rotary shaft rotated by the motor; an orbiting scroll that orbits in conjunction with the rotary shaft; and a fixed scroll that forms a compression chamber together with the orbiting scroll, wherein the housing includes a rear housing that forms a discharge chamber that accommodates refrigerant discharged from the compression chamber, the rear housing including a partition wall that separates the discharge chamber from an introduction chamber into which refrigerant flows from outside the housing, an injection valve assembly that covers the introduction chamber and guides refrigerant from the introduction chamber to the compression chamber is provided between the fixed scroll and the partition wall of the rear housing, the partition wall having a first surface that surrounds a portion of a side surface of the injection valve assembly and a second surface that is higher than the first surface, and a fastening member that fastens the injection valve assembly to the rear housing is disposed radially inward of the second surface.

[0012] According to an embodiment, the injection valve assembly may include a sealing portion for sealing between the injection valve assembly and the head of the fastening member.

[0013] According to an embodiment, the injection valve assembly may include: a cover plate disposed on the partition wall and having an inlet through which the refrigerant of the introduction chamber flows; a gasket retainer coupled to the partition wall; an injection valve interposed between the cover plate and the gasket retainer and opening and closing the inlet; and a valve plate coupled to the gasket retainer and having an outlet through which the refrigerant flowing in through the inlet flows out.

[0014] According to an embodiment, a sealing portion for sealing between the injection valve assembly and the head of the fastening member may be provided on one surface of the valve plate on which the head of the fastening member is attached, and the sealing portion may be protruded to surround a fastening hole of the valve plate through which the fastening member passes.

[0015] According to an embodiment, a sealing portion for sealing between the injection valve assembly and the 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.

[0016] According to an embodiment, the gasket retainer may include a bead portion extending around the periphery and protruding toward the valve plate, and a fastening hole through which the fastening member passes, and the bead portion may surround the fastening hole.

[0017] According to an embodiment, the bead portion may include a radially outer inclined bead portion, a radially inner inclined bead portion, and a protruding bead portion connecting the outer inclined bead portion and the inner inclined bead portion, and the fastening hole may be formed radially inward of the outer inclined bead portion.

[0018] According to an embodiment, the outer bead portion may be compressed when assembled between the second surface and the valve plate, and the inner bead portion may be compressed when assembled between the first surface and the valve plate.

[0019] According to an embodiment, the gasket retainer may include a fastening hole through which the fastening member passes, a first bead portion extending along the radially outer periphery of the fastening hole and protruding toward the cover plate, and a second bead portion extending along the radially inner periphery of the fastening hole and protruding toward the cover plate.

[0020] According to an embodiment, the gasket retainer may further include a retainer portion that is beveled in a direction in which the injection valve is opened, and a valve bead portion that protrudes toward the valve plate.

[0021] According to an embodiment, the valve bead portion may be provided at a point where the inclination of the retainer portion begins.

[0022] According to an embodiment, a protruding height of the first bead portion may be greater than a protruding height of the second bead portion and the bulb bead portion.

[0023] According to an embodiment, the valve bead portion may be provided in a direction transverse to the width of the retainer portion.

[0024] According to an embodiment, the injection valve may include a valve portion that is bent to open and close the inlet, and the valve portion may have a hole extending along a length direction.

[0025] According to an embodiment, the hole may be provided at the center of the valve portion in the width direction and may extend in the length direction from the point where the banding of the valve portion begins.

[0026] According to an embodiment, the gasket retainer may include a circular body portion, a retainer portion extending from one side of the body portion toward the inlet and inclined toward the valve plate, and a support portion formed inclinedly connecting the retainer portion and the other side of the body portion to support the retainer portion.

[0027] According to an embodiment, the support part may be connected to an end of the retainer part that is farthest away from the body part in a direction in which the injection valve is opened, and a flow hole may be formed in the support part.

[0028] According to an embodiment, the surface where the flow hole is opened may extend from the support portion to a part of the body portion and may include a surface horizontal to the body portion and an inclined surface of the support portion.

[0029] According to an embodiment, the valve plate may include an inclined space in which the retainer part is mounted, and the outlet may be disposed at a position communicating with the inclined space and corresponding to the flow hole.

[0030] According to an embodiment, the fastening holes of the valve plate through which the fastening members pass may be disposed radially outward of the inclined space. [Effects of the Invention]

[0031] 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.

[0032] Furthermore, if the injection valve assembly is formed into a circular shape according to the embodiment, it can be rotated relative to the introduction chamber, and the design can be freely changed according to the position of the port for each vehicle. In addition, the combined force of the fastening member and the surface pressure generated by the bead portion of the gasket retainer can be transmitted evenly all around.

[0033] In addition, if the fastening member is arranged on the inlet chamber side, i.e., on the first surface of the partition wall forming the inlet chamber, the injection valve assembly can be made compact, and if a sealing portion is provided on one surface of the valve plate where the head of the fastening member is attached, refrigerant leakage can be prevented.

[0034] In addition, according to the embodiment, when the injection valve is opened on the retainer part, a flow hole is formed in front of the retainer part so that the refrigerant flowing in through the inlet can flow to the outlet, and the flow of the refrigerant passing through the gasket retainer is not interfered with and no pressure loss occurs.

[0035] In addition, according to the embodiment, if the gasket retainer has bead portions on both the radially outer and inner sides of the fastening hole, as well as at the point where the slope of the retainer portion begins, the banding point of the injection valve can be accurately determined.

[0036] Furthermore, if a hole is formed in the valve portion of the injection valve according to the embodiment, distortion can be prevented when the injection valve is opened and closed, and power can be reduced. The effects of the present invention are not limited to the effects described above, but should be understood to 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]

[0037] [Figure 1] 1 is a cross-sectional view illustrating a scroll compressor according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view illustrating the rear housing separated from FIG. 1. [Figure 3] 2 is an exploded perspective view showing the rear housing from FIG. 1 and the injection valve assembly housed in the rear housing. FIG. [Figure 4] FIG. 4 is a front view illustrating the injection valve assembly of FIG. 3 assembled to the rear housing. [Figure 5] FIG. 5 is a partial cross-sectional view of FIG. [Figure 6] FIG. 4 is a rear view of the cover plate of FIG. 3. [Figure 7] FIG. 4 is a rear view of the injection valve of FIG. 3. [Figure 8] 4 is a perspective view of the gasket retainer of FIG. 3 as seen from another side. [Figure 9]FIG. 4 is a rear view of the valve plate of FIG. 3. [Figure 10] FIG. 10 is a front view illustrating a gasket retainer according to another embodiment of the present invention. [Figure 11] FIG. 11 is a perspective view of FIG. [Figure 12] FIG. 10 is a front view illustrating an injection valve according to another embodiment of the present invention. [Figure 13] 13 is a cross-sectional view illustrating an injection valve assembly including the gasket retainer of FIG. 10 and the injection valve of FIG. 12 assembled to a rear housing. MODE FOR CARRYING OUT THE INVENTION

[0038] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a scroll compressor according to the present invention will now be described with reference to the accompanying drawings. Furthermore, the terms described 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 the part may further include other components, unless otherwise specified.

[0039] The scroll compressor according to one embodiment 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 Prior Art 2, and detailed description of the same components will be omitted.

[0040] The scroll compressor according to this embodiment further includes an injection valve assembly (2700) for forming an injection passage for introducing 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.

[0041] 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) covers an introduction chamber (I) through which refrigerant flows into the rear housing (130) from outside the housing, and guides the refrigerant in the introduction chamber (I) to the compression chamber (C).

[0042] 2, the rear housing 130 includes a first annular wall 134 that protrudes from the rear end plate and is located at the outermost position in the circumferential direction, a second annular wall 136 that protrudes from the rear end plate and is received in the first annular wall 134, and a partition wall 138 that protrudes from the rear end plate and is received in the second annular wall 136. The first annular wall 134, the second annular wall 136, and the partition wall 138 are formed to have different heights.

[0043] The first annular wall 134 is fastened to the center housing 110 to form a scroll-accommodating space, and the second annular wall 136 is in contact with the fixed scroll 500 to form a discharge chamber D. When the rear housing 130 is fastened to the center housing 110, the second annular wall 136 contacts the fixed scroll 500, thereby pressing the fixed scroll 500 toward the center housing 110 and increasing the fastening force between the fixed scroll 500 and the center housing 110 to prevent leakage. The partition wall 138 has a protruding length shorter than that of the second annular wall 136 so as to be spaced apart from the fixed scroll 500. The partition wall 138 is covered by a cover plate 2710 of the injection valve assembly 2700, as will be described later, to define an introduction chamber I.

[0044] 2 and 5, the partition wall 138 has a first surface 138a that surrounds a portion of the side surface of the injection valve assembly 2700 and a second surface 138b that is higher than the first surface 138a. Specifically, the first surface 138a and the second surface 138b extend parallel to each other, but the second surface 138b protrudes further from the rear mirror plate than the first surface 138a and is higher than the first surface 138a. The first surface 138a is formed radially inward of the partition wall than the second surface 138b, and a step formed by the first surface 138a and the second surface 138b may be formed so as to be recessed around the inside of the partition wall. The first surface 138a and the second surface 138b are connected by a third surface 138c that faces a portion of the side surface of the injection valve assembly 2700. The third surface 138c may extend perpendicularly from the first surface 138a and connect to the second surface 138b.

[0045] A discharge port (131) is formed in the rear end plate of the rear housing (130) to guide the refrigerant in the discharge chamber (D) to the outside of the housing (100), and the refrigerant in the discharge chamber (D) is guided to the discharge port (131) through a discharge port inlet (131a) shown in Fig. 4. In addition, an introduction port (133) is formed in the rear end plate of the rear housing (130) to introduce intermediate-pressure refrigerant from the outside of the housing (100), and the intermediate-pressure refrigerant can be guided from the introduction port (133) to the introduction chamber (I) through an introduction port outlet (133a) shown in Fig. 2.

[0046] Here, the positions of the discharge port 131 and the inlet port 133 can vary depending on the vehicle. In order to freely change the design of the injection valve assembly depending on the position of the vehicle-specific ports, the injection valve assembly 2700 of the present invention can be formed in a circular shape. That is, since the injection valve assembly 2700 is formed in a circular shape, it can be rotated relative to the inlet chamber 1, and the design can be freely changed depending on the position of the vehicle-specific ports. Furthermore, the fastening force of the fastening bolt 770 described above and the surface pressure generated by the bead portion of the gasket retainer 2790 can be transmitted evenly around the entire circumference of the injection valve assembly 2700.

[0047] In addition, in the present invention, the fastening member for fastening the injection valve assembly 2700 to the rear housing 130 is disposed on the introduction chamber I side, not the discharge chamber D side, specifically on the first surface 138a of the partition wall. Hereinafter, the fastening member will be described as a fastening bolt 770. This allows the injection valve assembly 2700 to be made more compact and facilitates design modifications. To this end, as shown in FIG. 2, the rear housing 130 is formed with a first fastening groove 139 on the first surface 138a of the partition wall, into which the fastening bolt 770 is inserted.

[0048] The injection valve assembly 2700 will be described in detail below with reference to Figures 3 to 9. The injection valve assembly 2700 is provided on the tip surface of the partition wall 138 to communicate and isolate the introduction chamber I and the injection port of the fixed scroll 500.

[0049] Specifically, the injection valve assembly (2700) may include a cover plate (2710) disposed on the partition wall (138) and having an inlet (2712) through which the refrigerant from the introduction chamber (I) flows in, a gasket retainer (2790) coupled to the partition wall (138), an injection valve (2720) interposed between the cover plate (2710) and the gasket retainer (2790) for opening and closing the inlet (2712), and a valve plate (2730) coupled to the gasket retainer (2790) and having an outlet (2736) through which the refrigerant flowing in through the inlet (2712) flows out.

[0050] 3 and 6, the cover plate 2710 is formed as a circular plate and includes a pair of inlets 2712a, 2712b through which the refrigerant flows into the introduction chamber I. That is, the cover plate 2710 includes a first inlet 2712a that is connected to one side of the introduction chamber I and a second inlet 2712b that is formed independently of the first inlet 2712a and is connected to the other side of the introduction chamber I. At this time, the first inlet 2712a and the second inlet 2712b are preferably formed as elongated holes to maximize the valve lifting force and the inflow flow rate of the refrigerant.

[0051] In particular, in this embodiment, the cover plate 2710 is attached to the recessed portion formed by the first and third surfaces 138a and 138c of the partition wall so as to face the first surface 138a. As a result, the cover plate 2710 itself can act as a seal to prevent internal leakage between the discharge chamber D and the introduction chamber I. As a result, a separate O-ring and groove processing for the O-ring are not required between the cover plate 2710 and the partition wall 138 of the rear housing, which reduces the number of parts, processing time, and cost, and prevents the O-ring from coming off the group.

[0052] Furthermore, as described below, the injection valve assembly (2700) includes a gasket retainer (2790) that is bonded to the second surface (138b) of the partition so as to surround the step, thereby preventing internal leakage between the discharge chamber (D) and the introduction chamber (I) with a single sealing member (gasket retainer).

[0053] In this case, the partition 138 is preferably formed in a circular shape, similar to the circular injection valve assembly 2700. This allows the cover plate 2710 to be attached to the recessed portion of the step to cover the introduction chamber I inside the partition 138.

[0054] 5, in order for the cover plate 2710 to support and seal the injection valve 2720, it is preferable that the height difference (h) between the first surface 138a and the second surface 138b be smaller than the sum of the thickness (t1) of the cover plate 2710 and the thickness (t2) of the injection valve 2720. By satisfying these dimensions, the injection valve 2720 can be fixed by being compressed between the cover plate 2710 and the gasket retainer 2790. That is, the injection valve 2720 can be fixed by contacting the gasket retainer 2790 in either case, and an appropriate surface pressure is formed between the injection valve 2720 and the gasket retainer 2790, thereby preventing damage to the injection valve 2720 due to vibrations that occur when the refrigerant flows through the injection valve 2720.

[0055] The cover plate 2710 further includes a first positioning hole 2716 through which the positioning pin passes. In addition, since the fastening bolt 770 is disposed inside the partition wall 138, a second fastening groove 2714 is formed around the cover plate 2710, recessed radially inward to allow the fastening bolt 770 to pass through.

[0056] 3 and 7, the injection valve 2720 includes a circular main body 2726 and a pair of valve portions 2721a and 2721b extending from the main body 2726 toward the pair of inlets 2712a and 2712b, respectively. That is, the injection valve 2720 includes a first valve portion 2721a extending from one side of the main body 2726 toward the first inlet 2712a to open and close the first inlet 2712a, and a second valve portion 2721b extending from the other side of the main body 2726 toward the second inlet 2712b to open and close the second inlet 2712b. In this embodiment, the first valve portion 2721a and the second valve portion 2721b extend side by side on opposite sides of the main body 2726. The main body portion (2726) and the pair of valve portions (2721a, 2721b) are preferably integrally formed to reduce the number of parts, size, cost, and weight.

[0057] In this case, the first valve portion 2721a may comprise a first head portion 2722a disposed on the first inlet 2712a, and a first leg portion 2724a connecting the first head portion 2722a to the main body portion 2726. Similarly, the second valve portion 2721b may comprise a second head portion 2722b disposed on the second inlet 2712b, and a second leg portion 2724b connecting the second head portion 2722b to the main body portion 2726.

[0058] The main body 2726 further includes a second positioning hole 2727, which is connected to the first positioning hole 2716 and through which a positioning pin passes. In addition, a third fastening groove 2728 is formed around the injection valve 2720, more specifically around the main body 2726, recessed radially inward to allow the fastening bolt 770 to pass through.

[0059] 3 and 8, the gasket retainer 2790 includes a circular main body 2791, a pair of retainer portions 2794a, 2794b extending at an angle from the main body 2791 toward the pair of inlets 2712a, 2712b and approaching the valve plate 2730, and a pair of support portions 2795a, 2795b formed at an angle and connecting the main body 2791 and the pair of retainer portions 2794a, 2794b, respectively, to support the retainer portions. The shape and dimensions of the gasket retainer around the main body 2791 are preferably the same as the shape and dimensions of the outer periphery of the partition wall 138.

[0060] Specifically, the gasket retainer 2790 includes a first retainer portion 2794a extending at an angle from one side of the body portion 2791 toward the first inlet 2712a to correspond to the first valve portion 2721a, and a second retainer portion 2794b extending from the other side of the body portion 2791 toward the second inlet 2712b to correspond to the second valve portion 2721b. In addition, a first support portion 2795a connects the other side of the body portion 2791 to the first retainer portion 2794a, and a second support portion 2795b connects one side of the body portion 2791 to the second retainer portion 2794b.

[0061] The first retainer portion 2794a and the second retainer portion 2794b are tapered so that the further they extend from the main body portion 2791, the closer they are to the valve plate 2730. Therefore, when the injection valve 2720 is opened to open the pair of inlets 2712, they support the first valve portion 2721a and the second valve portion 2721b, respectively, and limit the maximum opening position. In this embodiment, the first retainer portion 2794a and the second retainer portion 2794b extend side by side on opposite sides of the main body portion 2791, corresponding to the first valve portion 2721a and the second valve portion 2721b.

[0062] At this time, a flow hole 2796 may be formed in front of the retainer portion 2794 so that when the injection valve 2720 is opened on the retainer portion 2794, the refrigerant flowing in through the inlet 2712 can flow to the outlet 2736 (described later) without pressure loss. In this embodiment, the support portion 2795 is connected to the front end of the retainer portion 2794 that is farthest away from the main body portion 2791 in the direction in which the injection valve 2720 is opened, and therefore the flow hole 2796 may be formed in the support portion 2795. That is, the first support portion 2795a is provided with a first flow hole 2796a, so that the refrigerant flowing in through the first inlet 2712a can flow directly to the first outlet 2736a (described later) through the first flow hole 2796a, and the second support portion 2795b is provided with a second flow hole 2796b, so that the refrigerant flowing in through the second inlet 2712b can flow directly to the second outlet 2736b (described later) through the second flow hole 2796b. In particular, the retainer portion 2794 and the support portion 2795 are arranged in a line. As a result, the refrigerant flowing in through the inlet (2712) does not flow to either side of the retainer part (2794) but can flow directly to the outlet (2736) through the flow hole (2796), so the flow of the refrigerant passing through the gasket retainer (2790) is not interfered with and no pressure loss occurs.

[0063] In addition, the open surface of the flow hole (2796) may extend from the support part (2795) to a part of the main body part (2791) and may include a surface horizontal to the main body part (2791) and an inclined surface of the support part (2795), thereby further minimizing refrigerant flow interference.

[0064] Gasket retainer 2790 further includes a bead portion 2792 that protrudes toward valve plate 2730 from its periphery, specifically from its body portion 2791. As shown in Fig. 5, when injection valve assembly 2700 is assembled, bead portion 2792 is disposed radially outward of injection valve 2720. In addition, gasket retainer 2790 is coupled to second surface 138b of partition wall 138b so as to surround the step, forming bead portion 2792 around the periphery. Therefore, bead portion 2792 is pressed between partition wall 138b and valve plate 2730 by the fastening force of fastening bolt 770, thereby sealing the gap.

[0065] Specifically, bead portion 2792 includes outer bead portion 2792a on the radially outer side, inner bead portion 2792b on the radially inner side, and protruding bead portion 2792c connecting outer bead portion 2792a and inner bead portion 2792b. In this embodiment, outer bead portion 2792a and inner bead portion 2792b extend to the same height, and protruding bead portion 2792c is formed flat. As a result, outer bead portion 2792a can be compressed when assembled between second surface 138b of partition wall and valve plate 2730, and inner bead portion 2792b can be compressed when assembled between first surface 138a of partition wall and valve plate 2730.

[0066] The gasket retainer 2790 further includes a fourth fastening hole 2797 through which the fastening bolt 770 passes, and a third positioning hole 2798 that is connected to the second positioning hole 2727 and through which a positioning pin passes. The bead portion 2792 surrounds the fourth fastening hole 2797 to support and evenly transmit the fastening force of the fastening bolt 770. Specifically, the fourth fastening hole 2797 is formed radially inward from the outer sloping bead portion 2792a and overlaps the inner sloping bead portion 2792b. However, when the inner sloping bead portion 2792b passes the fourth fastening hole 2797, it detours radially inward to surround the fourth fastening hole 2797.

[0067] 3 and 9, the valve plate 2730 is formed as a circular plate and includes a pair of inclined spaces 2734a, 2734b to which a pair of retainer portions 2794a, 2794b are attached and which accommodate the refrigerant flowing in through the pair of inlets 2712a, 2712b, and a pair of outlets 2736a, 2736b which are connected to the pair of inclined spaces and through which the refrigerant flows out. That is, the first inclined space 2734a is fitted with the first retainer portion 2794a to accommodate the refrigerant flowing in through the first inlet 2712a and then flow out through the first outlet 2736a, and the second inclined space 2734b is fitted with the second retainer portion 2794b to accommodate the refrigerant flowing in through the second inlet 2712b and then flow out through the second outlet 2736b. The first inclined space (2734a) and the second inclined space (2734b) are recessed and formed to have an inclination corresponding to the first retainer portion (2794a) and the second retainer portion (2794b), and are formed side by side with each other.

[0068] The valve plate 2730 further includes a first protrusion 2732a and a second protrusion 2732b protruding toward the inlet of the fixed scroll 500. The first outlet 2736a passes through the first protrusion 2732a from the first inclined space 2734a, and the second outlet 2736b passes through the second inclined space 2734b from the second protrusion 2732b. This allows the refrigerant flowing out of the outlet 2736 to be supplied to the compression chamber C through the inlet of the fixed scroll 500.

[0069] At this time, it is preferable that the first outlet (2736a) is arranged at a position corresponding to the first flow hole (2796a) and the second outlet (2736b) is arranged at a position corresponding to the second flow hole (2796b) so that the refrigerant flowing through the flow hole (2796) can immediately flow out to the outlet (2736) without pressure loss.

[0070] The valve plate 2730 further includes a fifth fastening hole 2737 through which the fastening bolt 770 passes, and a fourth positioning groove 2739 that communicates with the third positioning hole 2798 and into which a positioning pin is inserted. The fifth fastening hole 2737 of the valve plate is disposed radially outward of the inclined space 2734.

[0071] As a result, the positioning pin passes through the first positioning hole (2716), the second positioning hole (2727), and the third positioning hole (2798) and is inserted into the fourth positioning groove (2739), thereby aligning the cover plate (2710), the injection valve (2720), the gasket retainer (2790), and the valve plate (2730).

[0072] In addition, the injection valve assembly (2700) can be fastened to the rear housing (130) by the fastening bolt (770) passing through the fifth fastening hole (2737) and the fourth fastening hole (2797), passing through the third fastening groove (2728) and the second fastening groove (2714), and fastening to the first fastening groove (138a).

[0073] At this time, since the fastening bolt 770 is disposed on the inlet chamber I side, specifically on the first surface 138a of the partition wall, there is a risk of refrigerant leaking through the space that the fastening bolt 770 passes through. To prevent this, the injection valve assembly may be provided with a sealing portion for sealing the gap between the injection valve assembly 2700 and the head of the fastening bolt 770.

[0074] 3 and 5, in this embodiment, the sealing portion 2738 is provided on one surface of the valve plate 2730 on which the head of the fastening bolt 770 is attached, and is formed to protrude so as to surround the fifth fastening hole 2737 of the valve plate. As a result, when the fastening bolt 770 is fastened, it tightly engages with the sealing portion 2738, thereby forming a seal between the head of the fastening bolt 770 and one surface of the valve plate 2730, thereby preventing refrigerant leakage.

[0075] However, without being limited to this, the sealing portion may be formed by a separate O-ring or the like, which is inserted between the head of the fastening bolt (770) and one side of the valve plate (2730) and is compressed when the fastening bolt is tightened.

[0076] Next, with reference to Figures 10 and 11, a gasket retainer (3790) according to another embodiment of the present invention will be described. As described above, the gasket retainer (3790) includes a fourth fastening hole (3797) through which the fastening bolt (770) passes, and a pair of retainer portions (3794a, 3794b) that are beveled in the direction in which the injection valve is opened, i.e., toward the valve plate.

[0077] However, in this embodiment, the pair of retainer portions 3794a, 3794b are beveled along the cutouts on the gasket retainer 3790. Specifically, the inner portion of the body portion 3791 of the gasket retainer 3790, which is cut out along a U-shaped cutout, is beveled onto the retainer portion 3794. At this time, a pair of wings 3795 are provided on both sides of each retainer portion 3794, connecting the opposite sides of the retainer portion 3794 to the opposing body portion 3791 in order to maintain the angle of inclination of the retainer portion. As a result, a U-shaped main flow hole 3796c may be formed on one side of the pair of wings 3795, and a pair of straight-line shaped auxiliary flow holes 3796d may be formed on the other side. Therefore, when the inlet 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 hole (3796c) and a pair of auxiliary flow holes (3796d).

[0078] Here, the gasket retainer 3790 may include a first bead portion 3792d extending along the radially outer periphery of the fourth fastening hole 3797 and protruding toward the cover plate, a second bead portion 3792e extending along the radially inner periphery of the fourth fastening hole 3797 and protruding toward the cover plate, and a valve bead portion 3792f provided on each retainer portion 3794 and protruding toward the valve plate. That is, the first bead portion 3792d and the second bead portion 3792e protrude in the same direction, while the valve bead portion 3792f protrudes in the opposite direction to the first bead portion 3792d and the second bead portion 3792e.

[0079] The height and width of the bead portion can be set differently depending on the importance of leakage. The first bead portion (3792d) is the most important bead, as it prevents leakage of the high discharge pressure in the discharge chamber (D). The second bead portion (3792e) prevents refrigerant from flowing back when the pressure in the compression chamber (C) becomes higher than the pressure in the introduction chamber (I) due to the rotation of the scroll. Therefore, the protruding height of the first bead portion (3792d) can be made greater than the protruding height of the second bead portion (3792e) (see FIG. 13). Furthermore, the width of the first bead portion (3792d) can be made greater than the width of the second bead portion (3792e). This allows more of the accumulated force of the fastening bolt (770) to be applied to the first bead portion (3792d), ensuring reliable sealing.

[0080] Unlike the first bead portion 3792d and the second bead portion 3792e, the valve bead portion 3792f is not intended for sealing, but rather to accurately determine the bending point of the injection valve. To this end, the valve bead portion 3792f is preferably provided on the retainer portion 3794 at the point where the slope of the retainer portion 3794 begins. This allows the valve bead portion 3792f to press the point where bending of the valve portion of the injection valve begins, i.e., the reference point during bending. In this embodiment, the valve bead portion 3792f is provided between a pair of auxiliary flow holes 3796d in a direction across the width of the retainer portion 3794.

[0081] In particular, because valve bead portion 3792f protrudes toward the valve plate, unlike first bead portion 3792d and second bead portion 3792e, its entire surface area can be in equal contact with retainer portion 3794 of the gasket retainer when the valve portion of the injection valve is fully opened, providing stable support (see FIG. 13). If valve bead portion 3792f protruded toward the cover plate like first bead portion 3792d and second bead portion 3792e, the valve bead portion would be able to press the point where bending of the valve portion begins, but it would come into unstable contact with the surface of retainer portion 3794 when the valve portion is opened, which could cause damage to the valve portion.

[0082] In this case, the protruding height of the valve bead portion 3792f may be formed to be the same as the protruding height of the second bead portion 3792e. In this case, the protruding height of the first bead portion 3792d may be formed to be greater than the protruding heights of the second bead portion 3792e and the valve bead portion 3792f (see FIG. 13).

[0083] Next, referring to Figure 12, an injection valve (3720) according to another embodiment of the present invention will be described. As described above, the injection valve 3720 includes a pair of valve portions 3721a and 3721b that are banded to open and close the inlet. However, in this embodiment, the pair of valve portions 3721a and 3721b correspond to the inner portions of the body portion 3726 of the injection valve 3720 that are cut by the cutout portion, and can be banded to the body portion 3726.

[0084] If the injection valve assembly is made more compact, the length of the valve part (3721) of the injection valve will also be shorter, but if the length of the valve part is shortened, the power required to open the valve part will increase. Also, if the width of the valve part (3721) is reduced to reduce power consumption, the behavior of the valve part when opening and closing may become unstable, and distortion may occur.

[0085] To solve this problem, in this embodiment, each of the pair of valve portions (3721a, 3721b) is provided with a hole (3729) extending along the length. In this embodiment, the hole (3729) is provided at the upper middle of the valve portion (3721) in the width direction and extends from the point where the bending of the valve portion (3721) begins to approximately the middle in the length direction. In other words, the overall width of the valve portion (3721) is maintained wide, and the hole (3729) divides the width of the valve portion (3721) in two, reducing the width of the portion connected to the main body portion (3726), thereby reducing the power required to lift the valve portion (3721). This allows for reduced power consumption while preventing distortion during opening and closing of the injection valve (3720) even in a compact package.

[0086] 13 is a cross-sectional view illustrating an injection valve assembly including the gasket retainer 3790 of FIG. 10 and the injection valve 3720 of FIG. 12 assembled to the rear housing 138. The cover plate and valve plate of the injection valve assembly can have the same structure as described above.

[0087] 13, it can be seen that the valve bead portion 3792f protrudes in the opposite direction from the first bead portion 3792d and the second bead portion 3792e, and that the height and width of the first bead portion 3792d are greater than the height and width of the second bead portion 3792e and the valve bead portion 3792f.

[0088] The present invention is not limited to the specific embodiments and explanations described above, and various modifications can be made by anyone skilled in the art 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.

[0089] The present invention relates to a scroll compressor, and more particularly to a scroll compressor in which not only suction pressure refrigerant but also intermediate pressure refrigerant is introduced into a compression chamber of the scroll compressor to increase the amount of refrigerant discharged from the compression chamber, thereby improving the performance and efficiency of the compressor, and in which the shape of the injection valve assembly is simplified and a fastening member is located on the introduction chamber side, allowing the position of the port to be freely changed and the injection valve assembly to be made compact. [Explanation of symbols]

[0090] 100 Housing 110 Center Housing 120 Front Housing 130 rear housing 131 Discharge port 131a Discharge port inlet 133 Introduction Port 133a Inlet port outlet 134 1st ring wall 136 Second ring wall 138 Bulkhead 138a 1st page 138b Side 2 138c 3rd page 139 1st fastening groove 200 motor 300 rotation axis 400 Swivel Scroll 500 fixed scroll 512 Fixed scroll outlet 600 Discharge Valve 700 Injection Valve Assembly 770 Fastening bolt 2700 Injection Valve Assembly 2710 Cover Plate 2712 Inlet 2712a 1st inlet 2712b 2nd inlet 2714 2nd fastening groove 2716 First Positioning Hole 2720, 3720 injection valve 2721a First valve section 2721b 2nd inlet 2722a Head 1 2722b 2nd head 2724a 1st leg 2724b Second leg 2726, 2791, 3726, 3791 Main body 2727 Second Positioning Hole 2728 Third fastening groove 2730 Valve Plate 2732a 1st protrusion 2732b Second protrusion 2734 Inclined space 2734a 1st inclined space 2734b 2nd inclined space 2736 Outlet 2736a 1st outlet 2736b 2nd outlet 2737 5th Closing Hole 2738 Sealed part 2739 4th positioning groove 2790, 3790 Gasket Retainer 2792 Bead part 2792a Outer bead 2792b Inner bead 2792c Protruding bead 2794, 3794 retainer part 2794a First retainer part 2794b Second retainer part 2795 Support part 2795a 1st support part 2795b Second support part 2796 Fluid Hall 2796a First Flow Hall 2796b Second Flow Hall 2797, 3797 4th Closing Hole 2798 3rd Positioning Hole 3720 Valve Section 3729 holes 3792d First bead section 3792e Second bead section 3792f Valve bead part 3795 Wings 3796c Main Flow Hall 3796d Auxiliary Flow Hall

Claims

1. Housing and a motor provided 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; the rear housing includes a partition wall that separates the discharge chamber from an introduction chamber into which refrigerant flows from the outside of the housing, an injection valve assembly is provided between the fixed scroll and the partition wall of the rear housing to cover the inlet chamber and guide the refrigerant in the inlet chamber to the compression chamber; the partition wall has a first surface surrounding a portion of a side surface of the injection valve assembly and a second surface that is higher than the first surface; a fastening member for fastening the injection valve assembly to the rear housing is disposed radially inward of the second surface; The injection valve assembly includes: a cover plate disposed inside the partition wall and having an inlet through which the refrigerant from the introduction chamber flows; a gasket retainer coupled to the second surface of the partition wall; an injection valve interposed between the cover plate and the gasket retainer for opening and closing the inlet; a valve plate coupled to the gasket retainer and having an outlet through which the refrigerant flowing in through the inlet flows out.

2. 2. The scroll compressor according to claim 1, wherein the injection valve assembly is provided with a sealing portion for sealing between the injection valve assembly and the head of the fastening member.

3. 2. The scroll compressor of claim 1, wherein a sealing portion for sealing between the injection valve assembly and the head of the fastening member is provided on one surface of the valve plate where the head of the fastening member is mounted, the sealing portion being protruded to surround a fastening hole of the valve plate through which the fastening member passes.

4. 2. The scroll compressor according to claim 1, wherein a sealing member for sealing the gap between the injection valve assembly and the head of the fastening member is inserted between the head of the fastening member and one surface of the valve plate, and is compressed when the fastening member is tightened.

5. the gasket retainer includes a bead portion extending along the periphery and protruding toward the valve plate, and a fastening hole through which the fastening member passes; 2. The scroll compressor according to claim 1, wherein the bead portion surrounds the fastening hole.

6. the bead portion includes an outer inclined bead portion on the outer side in the radial direction, an inner inclined bead portion on the inner side in the radial direction, and a protruding bead portion connecting the outer inclined bead portion and the inner inclined bead portion, 6. The scroll compressor according to claim 5, wherein the fastening hole is formed radially inward from the outer inclined bead portion.

7. 7. The scroll compressor according to claim 6, wherein the outer inclined bead portion is compressed when assembled between the second surface and the valve plate, and the inner inclined bead portion is compressed when assembled between the first surface and the valve plate.

8. The gasket retainer is a fastening hole through which the fastening member passes; a first bead portion extending along the radially outer periphery of the fastening hole and protruding toward the cover plate; 2. The scroll compressor according to claim 1, further comprising: a second bead portion extending along a radially inner periphery of the fastening hole and protruding toward the cover plate.

9. Housing and a motor provided within the housing; a rotating 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; the rear housing includes a partition wall that separates the discharge chamber from an introduction chamber into which refrigerant flows from the outside of the housing, an injection valve assembly for covering the introduction chamber and guiding the refrigerant in the introduction chamber to the compression chamber is provided between the fixed scroll and the partition wall of the rear housing; the partition wall has a first surface that encloses a portion of a side surface of the injection valve assembly and a second surface that is higher than the first surface; a fastening member for fastening the injection valve assembly to the rear housing is disposed radially inside the second surface; The injection valve assembly includes: a cover plate disposed inside the partition wall and having an inlet through which the refrigerant from the introduction chamber flows; a gasket retainer coupled to the second surface of the partition wall; an injection valve interposed between the cover plate and the gasket retainer for opening and closing the inlet; a valve plate coupled to the gasket retainer and having an outlet through which the refrigerant flowing in through the inlet flows out, The gasket retainer is a fastening hole through which the fastening member passes; a first bead portion extending along a radial outer periphery of the fastening hole and protruding toward the cover plate; a second bead portion extending along a radially inner periphery of the fastening hole and protruding toward the cover plate; The gasket retainer is a retainer portion that is inclined in a direction in which the injection valve opens; a valve bead portion protruding toward the valve plate.

10. 10. The scroll compressor according to claim 9, wherein the valve bead portion is provided at a point where the retainer portion starts to slope.

11. 10. The scroll compressor according to claim 9, wherein the protruding height of the first bead portion is greater than the protruding heights of the second bead portion and the valve bead portion.

12. 10. The scroll compressor according to claim 9, wherein the valve bead portion is provided in a direction transverse to the width of the retainer portion.

13. The injection valve is a valve portion that is banded to open and close the inlet, 2. The scroll compressor according to claim 1, wherein the valve portion has a hole extending along a length thereof.

14. 14. The scroll compressor of claim 13, wherein the hole is provided at a widthwise center of the valve portion and extends lengthwise from a point where the banding of the valve portion begins.

15. The gasket retainer is a circular main body; a retainer portion extending from one side of the main body portion toward the inlet port and inclined toward the valve plate; 2. The scroll compressor according to claim 1, further comprising: a support portion formed to be inclined and connecting the retainer portion and the other side of the main body portion to support the retainer portion.

16. 16. The scroll compressor of claim 15, wherein the support portion is connected to an end of the retainer portion that is farthest from the main body portion in a direction in which the injection valve is opened, and a flow hole is formed in the support portion.

17. Housing and a motor provided within the housing; a rotating 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; the rear housing includes a partition wall that separates the discharge chamber from an introduction chamber into which refrigerant flows from the outside of the housing, an injection valve assembly for covering the introduction chamber and guiding the refrigerant in the introduction chamber to the compression chamber is provided between the fixed scroll and the partition wall of the rear housing; the partition wall has a first surface that encloses a portion of a side surface of the injection valve assembly and a second surface that is higher than the first surface; a fastening member for fastening the injection valve assembly to the rear housing is disposed radially inside the second surface; The injection valve assembly includes: a cover plate disposed inside the partition wall and having an inlet through which the refrigerant from the introduction chamber flows; a gasket retainer coupled to the second surface of the partition wall; an injection valve interposed between the cover plate and the gasket retainer for opening and closing the inlet; a valve plate coupled to the gasket retainer and having an outlet through which the refrigerant flowing in through the inlet flows out, The gasket retainer is a circular main body; a retainer portion extending from one side of the main body portion toward the inlet port and inclined toward the valve plate; a support portion that connects the retainer portion and the other side of the main body portion and is formed to be inclined in order to support the retainer portion, the support portion is connected to an end of the retainer portion that is farthest from the body portion in a direction in which the injection valve is opened, and a flow hole is formed in the support portion; a surface on which the flow hole is opened extending from the support portion to a portion of the main body portion, and including a surface horizontal to the main body portion and an inclined surface of the support portion.

18. Housing and a motor provided within the housing; a rotating 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; the rear housing includes a partition wall that separates the discharge chamber from an introduction chamber into which a refrigerant flows from the outside of the housing, an injection valve assembly is provided between the fixed scroll and the partition wall of the rear housing to cover the introduction chamber and introduce the refrigerant in the introduction chamber into the compression chamber; the partition wall has a first surface that encloses a portion of a side surface of the injection valve assembly and a second surface that is higher than the first surface; a fastening member for fastening the injection valve assembly to the rear housing is disposed radially inside the second surface; The injection valve assembly includes: a cover plate disposed on the second surface of the partition wall and having an inlet through which the refrigerant from the introduction chamber flows; a gasket retainer coupled to the second surface of the partition wall; an injection valve interposed between the cover plate and the gasket retainer for opening and closing the inlet; a valve plate coupled to the gasket retainer and having an outlet through which the refrigerant flowing in through the inlet flows out, The gasket retainer is a circular main body; a retainer portion extending from one side of the main body portion toward the inlet port at an angle so as to approach the valve plate; a support portion that connects the retainer portion and another side surface of the main body portion and is formed at an incline to support the retainer portion, the support portion is connected to an end of the retainer portion that is farthest from the body portion in a direction in which the injection valve is opened, and a flow hole is formed in the support portion; the valve plate includes an inclined space in which the retainer portion is seated, The scroll compressor, wherein the outlet communicates with the inclined space and is disposed at a position corresponding to the flow hole.

19. 19. The scroll compressor according to claim 18, wherein the fastening holes of the valve plate through which the fastening members pass are disposed radially outward of the inclined space.

Images