Scroll compressor

Abstract

The present invention aims to provide a scroll compressor in which not only suction pressure refrigerant but also intermediate pressure refrigerant is introduced into the 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 the fastening bolts are located on the introduction chamber side, allowing the position of the port to be freely changed to make the injection valve assembly compact. [Solution] The scroll compressor of the present invention includes a housing, a motor provided within the housing, a rotating shaft rotated by the motor, a rotating scroll that orbits in conjunction with the rotating shaft, and 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 that separates the discharge chamber from an introduction chamber into which refrigerant flows from outside the housing, and an injection valve assembly is provided between the fixed scroll and the partition of the rear housing to cover the introduction chamber and guide the refrigerant in the introduction chamber to the compression chamber, and the partition has a first surface that surrounds a portion of a side of the injection valve assembly and a second surface that is higher than the first surface.

Description

Technical Field

[0001] The present invention relates to a scroll compressor. More specifically, the present invention relates to a scroll compressor that introduces not only refrigerant at suction pressure but also refrigerant at intermediate pressure into a compression chamber of the scroll compressor, increases the refrigerant discharge amount discharged from the compression chamber, and thereby improves the performance and efficiency of the compressor. The present invention also relates to a scroll compressor that can simplify the shape of an injection valve assembly, arrange fastening bolts on the introduction chamber side, and compact the injection valve assembly while freely changing the position of a port.

Background Art

[0002] Generally, an air conditioner (A / C) for indoor heating and cooling is installed in an automobile. Such an air conditioner includes a compressor that compresses a low-temperature and low-pressure vapor refrigerant drawn from an evaporator into a high-temperature and high-pressure vapor refrigerant and sends it to a condenser as a component of a cooling system. Compressors include reciprocating compressors that compress refrigerant by the reciprocating motion of a piston and rotary compressors that perform compression while rotating. Reciprocating compressors include a crank type that uses a crank to transmit power to a plurality of pistons by a drive source transmission method, a swash plate type that transmits power to a shaft on which a swash plate is installed, etc. Rotary compressors include a vane rotary type that uses a rotating rotary shaft and vanes, and a scroll type that uses a orbiting scroll and a fixed scroll. A scroll compressor can obtain a relatively high compression ratio compared to other types of compressors, and has the advantage of smoothly connecting the refrigerant suction, compression, and discharge strokes to obtain stable torque. Therefore, it is widely used for refrigerant compression in air conditioners and the like.

[0003] In a conventional scroll compressor disclosed in Patent Document 1, only refrigerant at suction pressure is sucked into a compression chamber, compressed, and then discharged to the outside through a series of processes. However, such a conventional scroll compressor has a problem in that the refrigerant discharge amount discharged from the compression chamber is fixed, and there is a limit to improving the performance and efficiency of the compressor. To solve this problem, as shown in FIGS. 1 and 2 of Patent Document 2, a scroll compressor is disclosed which includes an injection valve assembly (700) for opening and closing an injection flow path that guides refrigerant at an intermediate pressure flowing in from the outside of the compressor into the compression chamber (C), and leakage prevention means.

[0004] 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 leakage prevention means. By a fastening bolt (770) passing through the first fastening hole (739a) of the valve plate, the third fastening hole (796) of the gasket retainer, and the second fastening hole (714) of the cover plate and being fastened to the fastening groove (138a) of the rear housing, the injection valve assembly (700) can be fastened to the rear housing (130). Thereby, the gasket retainer (790) is compressed between the cover plate (710) and the valve plate (730) to seal therebetween, and the injection valve (720) is compressed and fixed together between the cover plate (710) and the gasket retainer (790). However, since the injection valve assembly (700) has a complex shape and is difficult to rotate, there is a problem that it is difficult to change the design according to the positions of the vehicle-specific introduction port (133) and the discharge port (131). That is, the design freedom is not high. Also, there is a disadvantage that the fastening bolt (770) is disposed outside the third annular wall (138) forming the introduction chamber (I), increasing the package size.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention can improve the performance and efficiency of a scroll compressor by introducing refrigerant at an intermediate pressure, in addition to refrigerant at an inlet pressure, into a compression chamber of the scroll compressor to increase the amount of refrigerant discharged from the compression chamber, and can simplify the shape of an injection valve assembly and arrange fastening bolts on the introduction chamber side to compact the injection valve assembly while freely changing the position of a port. The technical problems to be achieved by the present invention are not limited to the above-described technical problems, and other technical problems not mentioned will be clearly understood by those having ordinary knowledge in the technical field to which the present invention pertains as described below.

Means for Solving the Problems

[0007] To solve the above problems, the present invention includes a housing, a motor provided in the housing, a rotating shaft rotated by the motor, a swivel scroll that is interlocked with the rotating shaft and performs a swirling motion, and a fixed scroll that forms a compression chamber together with the swivel scroll. The housing includes a rear housing that forms a discharge chamber for accommodating refrigerant discharged from the compression chamber. The rear housing includes a partition wall that partitions the discharge chamber and 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 introduction chamber and guide the refrigerant in the introduction chamber to the compression chamber. The partition wall is characterized by having a first surface that surrounds a part of the side surface of the injection valve assembly and a second surface that is higher than the first surface.

[0008] The first surface is formed radially inward of the second surface of the partition wall, and the first surface and the second surface are connected by a third surface that faces a part of the side surface of the injection valve assembly.

[0009] The injection valve assembly is formed in a circular shape, and fastening bolts for fastening the injection valve assembly to the rear housing are arranged on the first surface.

[0010] The injection valve assembly includes a cover plate disposed on the partition wall and having an inlet through which the refrigerant in the introduction chamber flows in, 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.

[0011] The cover plate is in surface contact with the first surface.

[0012] The injection valve includes a circular ring-shaped main body portion and a valve portion extending from one side of the main body portion toward the inlet.

[0013] The gasket retainer includes a circular ring-shaped main body portion, a retainer portion extending from one side of the main body portion and inclining so as to approach the valve plate toward the inlet, and a support portion connecting the other side of the main body portion and the retainer portion and supporting the retainer portion so as to be inclined.

[0014] The gasket retainer is coupled to the second surface.

[0015] The partition wall is formed in a circular shape and protrudes from the rear mirror plate of the rear housing so as to form the space of the introduction chamber inside.

[0016] The height difference (h) between the first surface and the second surface is smaller than the sum of the thickness (t1) of the cover plate and the thickness (t2) of the injection valve.

[0017] The gasket retainer includes a bead portion protruding toward the valve plate around it.

[0018] When the injection valve assembly is assembled, the bead portion is disposed on the outer side in the radial direction of the injection valve.

[0019] Around the cover plate and the injection valve, fastening grooves are respectively formed so as to be recessed radially inward because there are too many fastening bolts for fastening the injection valve assembly to the rear housing.

[0020] In the gasket retainer, a fastening hole is formed through which a fastening bolt for fastening the injection valve assembly to the rear housing passes, and the bead portion surrounds the fastening hole.

Advantages of the Invention

[0021] According to the present invention, not only the refrigerant at the suction pressure but also the refrigerant at the intermediate pressure is introduced into the compression chamber of the scroll compressor, so that the refrigerant discharge amount discharged from the compression chamber can be increased, and the performance and efficiency of the compressor can be improved. Further, since the shape of the injection valve assembly is formed in a circular shape, it can be freely designed and changed according to the position of the vehicle-specific port so as to be rotatable with respect to the introduction chamber, and the surface pressure generated by the fastening force of the fastening bolt and the bead portion of the gasket retainer can be transmitted evenly along the circumference as a whole. Further, since the fastening bolt is disposed on the introduction chamber side, that is, on the first surface of the partition wall forming the introduction chamber, the injection valve assembly can be made more compact.

[0022] Further, since the cover plate is mounted on the step provided in the partition wall of the rear housing, the cover plate itself can serve as a seal to prevent internal leakage between the discharge chamber and the introduction chamber. Thereby, since a separate O-ring and groove processing for the O-ring are not required between the cover plate and the partition wall of the rear housing, the number of parts, the processing time, and the cost can be reduced, and the problem of the O-ring coming off from the groove does not occur. Furthermore, by including a gasket retainer in which the injection valve assembly is coupled to the partition wall so as to surround the step, internal leakage between the discharge chamber and the introduction chamber can be prevented by a single sealing member (gasket retainer). The effects of the present invention are not limited to the effects described above, and it should be understood that all effects inferable from the configuration of the invention described in the detailed description or claims of the present invention are included.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Modes for Carrying Out the Invention

[0024] Hereinafter, the scroll compressor of the present invention will be described with reference to the accompanying drawings. In addition, the terms described later are terms defined in consideration of the functions in the present invention, which can be changed according to the intentions or customs of users and operators. The following examples do not limit the scope of the rights of the present invention, but are merely exemplary matters of the components presented in the claims of the present invention. In order to clearly explain the present invention, parts not related to the explanation are omitted, and the same reference numerals are given to the same or similar components throughout the specification. Throughout the specification, when a part "includes" a certain component, this means that other components can be further provided, rather than excluding other components, unless otherwise specifically stated to the contrary.

[0025] The scroll compressor of the present invention includes a housing (100), a motor (200) provided in the housing (100), a rotating shaft (300) rotated by the motor (200), a swivel scroll (400) that is swung in conjunction with the rotating shaft (300), a fixed scroll (500) that forms a compression chamber (C) together with the swivel scroll (400), and a discharge valve (600) that is disposed on one surface of the fixed scroll (500) and opens and closes a discharge port (512) of the fixed scroll through which the refrigerant compressed in the compression chamber (C) is discharged. Here, the same drawing reference numerals are used for the same components as those of the scroll compressor in the prior art document 2, and detailed descriptions of the same components are omitted. And the scroll compressor according to the present embodiment further includes an injection passage that guides a refrigerant at an intermediate pressure from the outside of the housing (100) (in a vapor compression refrigeration cycle including a scroll compressor, a condenser, an expansion valve, and an evaporator, for example, downstream of the condenser) into the compression chamber (C), and an injection valve assembly (2700) for opening and closing the injection passage.

[0026] The housing (100) includes a center housing (110) through which the rotating shaft (300) passes, a front housing (120) that forms a motor accommodation space for accommodating the motor (200), and a rear housing (130) that forms a discharge chamber (D) for accommodating the refrigerant discharged from the compression chamber (C). The injection valve assembly (2700) can be interposed between the fixed scroll (500) and the rear housing (130). The injection valve assembly (2700) covers an introduction chamber (I) through which the refrigerant flows into the housing from the outside in the rear housing (130), and guides the refrigerant in the introduction chamber (I) into the compression chamber (C).

[0027] As shown in FIG. 2, the rear housing (130) includes a first annular wall (134) that protrudes from the rear mirror plate and is located on the outermost side in the circumferential direction, a second annular wall (136) that protrudes from the rear mirror plate and is accommodated in the first annular wall (134), and a partition wall (138) that protrudes from the rear mirror plate and is accommodated in the second annular wall (136). At this time, the first annular wall (134), the second annular wall (136), and the partition wall (138) are formed to have different heights from each other.

[0028] The first annular wall (134) is fastened to the center housing (110) to form a scroll accommodation space, and the second annular wall (136) is brought into contact with the fixed scroll (500) to form a discharge chamber (D). Here, when the second annular wall (136) is brought into contact with the fixed scroll (500) and the rear housing (130) is fastened to the center housing (110), the fixed scroll (500) can be pressed toward the center housing (110) to improve the fastening force between the fixed scroll (500) and the center housing (110) and prevent leakage. The partition wall (138) has a protruding length shorter than that of the second annular wall (136) so as to be separated from the fixed scroll (500), and is covered by a cover plate (2710) of an injection valve assembly (2700) as described later to partition an introduction chamber (I).

[0029] At this time, as shown in FIGS. 2 and 5, the partition wall (138) has a first surface (138a) that surrounds a part 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 in parallel, and the second surface (138b) protrudes more 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 second surface (138b) of the partition wall, and a step formed by the first surface (138a) and the second surface (138b) can be formed 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 part of the side surface of the injection valve assembly (2700). The third surface (138c) can extend perpendicularly from the first surface (138a) and be connected to the second surface (138b).

[0030] On the rear mirror plate of the rear housing (130), a discharge port (131) for guiding the refrigerant in the discharge chamber (D) to the outside of the housing (100) is formed, and the refrigerant in the discharge chamber (D) is guided to the discharge port (131) through the discharge port inlet (131a) shown in FIG. 4. Further, an introduction port (133) for introducing the refrigerant at an intermediate pressure from the outside of the housing (100) is also formed on the rear mirror plate of the rear housing (130), and the refrigerant at the intermediate pressure can be guided from the introduction port (133) to the introduction chamber (I) through the introduction port outlet (133a) shown in FIG. 2.

[0031] Here, the positions of the discharge port (131) and the introduction port (133) can be changed depending on the vehicle. In this way, in order to freely design and change the injection valve assembly according to the position of the port for each vehicle, the injection valve assembly (2700) can be formed in a circular shape in the present invention. That is, by forming the injection valve assembly (2700) in a circular shape, it is possible to freely design and change according to the position of the port for each vehicle so as to be rotatable with respect to the introduction chamber (I). Further, the surface pressure generated by the clamping force of the fastening bolt (770) and the bead portion of the gasket retainer (2790) to be described later can be transmitted evenly overall along the circumference of the injection valve assembly (2700). Also, in the present invention, the fastening bolt (770) for fastening the injection valve assembly (2700) to the rear housing (130) is disposed on the introduction chamber (I) side, not on the discharge chamber (D) side, specifically on the first surface (138a) of the partition wall. Thereby, the injection valve assembly (2700) can be made more compact, and the design change becomes easier. For this purpose, as shown in FIG. 2, a first fastening groove (139) into which the fastening bolt (770) is inserted is formed on the first surface (138a) of the partition wall in the rear housing (130).

[0032] Hereinafter, the injection valve assembly (2700) will be described in detail with reference to FIGS. 3 to 9. The injection valve assembly (2700) is provided on the tip surface of the partition wall (138) so as to communicate and shield between the introduction chamber (I) and the injection port of the fixed scroll (500). Specifically, the injection valve assembly (2700) includes a cover plate (2710) disposed on the partition wall (138) and having an inlet (2712) through which the refrigerant in 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.

[0033] As shown in FIGS. 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 in the introduction chamber (I) flows in. That is, it includes a first inlet (2712a) communicating with one side of the introduction chamber (I) and a second inlet (2712b) formed independently of the first inlet (2712a) and communicating with 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 for maximizing the valve lifting force and the refrigerant inflow rate.

[0034] Particularly, in this embodiment, the cover plate (2710) is mounted on the recessed portion formed by the first surface (138a) and the third surface (138c) so as to be in surface contact with the first surface (138a) of the partition wall. Thereby, the cover plate (2710) itself can serve as a sealing function to prevent internal leakage between the discharge chamber (D) and the introduction chamber (I). Thereby, 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, so that the number of parts, the processing time, and the cost can be reduced, and the problem of the O-ring detaching from the groove does not occur. Furthermore, as will be described later, by including a gasket retainer (2790) coupled to the second surface (138b) of the partition wall so as to surround the step, internal leakage between the discharge chamber (D) and the introduction chamber (I) can be prevented by a single sealing member (gasket retainer). At this time, the partition wall (138) is preferably formed in a circular shape similar to the injection valve assembly (2700) formed in a circular shape. Thereby, the cover plate (2710) can be mounted on the recessed portion of the step and cover the introduction chamber (I) inside the partition wall (138).

[0035] As shown in FIG. 5, in order for the cover plate (2710) to support the injection valve (2720) while satisfying the sealing, the height difference (h) between the first surface (138a) and the second surface (138b) is preferably smaller than the sum of the thickness (t1) of the cover plate (2710) and the thickness (t2) of the injection valve (2720). By satisfying such dimensions, the injection valve (2720) can be fixed by being squeezed between the cover plate (2710) and the gasket retainer (2790). That is, the injection valve (2720) can be fixed in contact with the gasket retainer (2790) in any case, and an appropriate surface pressure is formed between the injection valve (2720) and the gasket retainer (2790), so that damage to the injection valve (2720) due to vibration generated when the refrigerant flows through the injection valve (2720) can be prevented. The cover plate (2710) further includes a first positioning hole (2716) through which the positioning pin passes. Also, since the fastening bolt (770) is disposed inside the partition wall (138), a second fastening groove (2714) is formed so as to be recessed radially inward around the cover plate (2710) because the fastening bolt (770) passes around the cover plate (2710).

[0036] As shown in FIGS. 3 and 7, the injection valve (2720) includes a circular ring-shaped main body portion (2726) and a pair of valve portions (2721a, 2721b) extending from the main body portion (2726) toward a pair of inlets (2712a, 2712b), respectively. That is, a first valve portion (2721a) extending from one side of the main body portion (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 portion (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 so as to be parallel to each other on opposite sides of the main body portion (2726). The main body portion (2726) and the pair of valve portions (2721a, 2721b) are preferably integrally formed for reducing the number of parts, size, cost, and weight.

[0037] At this time, the first valve portion (2721a) can be composed of a first head portion (2722a) disposed on the first inlet (2712a) and a first leg portion (2724a) connecting the first head portion (2722a) and the main body portion (2726). Similarly, the second valve portion (2721b) can be composed of a second head portion (2722b) disposed on the second inlet (2712b) and a second leg portion (2724b) connecting the second head portion (2722b) and the main body portion (2726). The main body portion (2726) further includes a second positioning hole (2727) communicating with the first positioning hole (2716) through which a positioning pin passes. Also, around the injection valve (2720), more precisely, around the main body portion (2726), a third fastening groove (2728) is formed so as to be recessed radially inward for the fastening bolt (770) to pass by.

[0038] As shown in FIGS. 3 and 8, the gasket retainer (2790) includes a circular ring-shaped main body portion (2791), a pair of retainer portions (2794a, 2794b) that extend from the main body portion (2791) so as to incline toward the valve plate (2730) toward a pair of inlet ports (2712a, 2712b), and a pair of support portions (2795a, 2795b) that are formed by connecting the main body portion (2791) and the pair of retainer portions (2794a, 2794b) to support the retainer portions so as to incline. It is preferable that the shape and dimensions around the main body portion (2791) of the gasket retainer are the same as the outer shape and dimensions around the partition wall (138).

[0039] Specifically, the gasket retainer (2790) includes a first retainer portion (2794a) that extends from one side of the main body portion (2791) so as to incline toward the first inlet port (2712a) so as to correspond to the first valve portion (2721a), and a second retainer portion (2794b) that extends from the other side of the main body portion (2791) toward the second inlet port (2712b) so as to correspond to the second valve portion (2721b). Further, the first support portion (2795a) connects the other side of the main body portion (2791) and the first retainer portion (2794a), and the second support portion (2795b) connects one side of the main body portion (2791) and the second retainer portion (2794b).

[0040] Since the first retainer portion (2794a) and the second retainer portion (2794b) are inclined so as to approach the valve plate (2730) as they extend from the main body portion (2791), when the injection valve (2720) is opened to open the pair of inlet ports (2712), the maximum open position can be limited while supporting the first valve portion (2721a) and the second valve portion (2721b), respectively. In this embodiment, the first retainer portion (2794a) and the second retainer portion (2794b) extend side by side on the opposite side of the main body portion (2791) corresponding to the first valve portion (2721a) and the second valve portion (2721b).

[0041] At this time, if the injection valve (2720) is opened on the retainer part (2794), a flow hole (2796) can be formed in front of the retainer part (2794) so that the refrigerant flowing in through the inlet (2712) can flow to the outlet (2736) described later without pressure loss. In this embodiment, since the support part (2795) is connected to the front end of the retainer part (2794) that is farthest from the direction in which the injection valve (2720) is opened from the main body part (2791), the flow hole (2796) can be formed in the support part (2795). That is, the first support part (2795a) is provided with a first flow hole (2796a), and the refrigerant flowing in through the first inlet (2712a) can immediately flow through the first flow hole (2796a) to the first outlet (2736a) described later. The second support part (2795b) is provided with a second flow hole (2796b), and the refrigerant flowing in through the second inlet (2712b) can immediately flow through the second flow hole (2796b) to the second outlet (2736b) described later. In particular, the retainer part (2794) and the support part (2795) are arranged in a row. Thereby, the refrigerant flowing in through the inlet (2712) does not flow to both sides of the retainer part (2794) and can immediately flow through the flow hole (2796) to the outlet (2736). Therefore, the flow of the refrigerant passing through the gasket retainer (2790) is not interfered with and no pressure loss occurs.

[0042] Also, the surface where the flow hole (2796) is opened can extend from the support part (2795) to a part of the main body part (2791) and can include the surface horizontal with the main body part (2791) and the inclined surface of the support part (2795), and the flow interference of the refrigerant can be further minimized. The gasket retainer (2790) further includes a bead portion (2792) that protrudes around, precisely around the main body portion (2791), toward the valve plate (2730). As shown in FIG. 5, when the injection valve assembly (2700) is assembled, the bead portion (2792) is disposed radially outside the injection valve (2720). In this way, since the gasket retainer (2790) is coupled to the second surface (138b) of the partition wall so as to surround the step and the bead portion (2792) is formed around, the bead portion (2792) can be pressed between the partition wall (138) and the valve plate (2730) by the fastening force of the fastening bolt (770) to seal therebetween.

[0043] Specifically, the bead portion (2792) includes an outer inclined bead portion (2792a) on the radially outer side, an inner inclined bead portion (2792b) on the radially inner side, and a protruding bead portion (2792c) that connects the outer inclined bead portion (2792a) and the inner inclined bead portion (2792b). In this embodiment, the outer inclined bead portion (2792a) and the inner inclined bead portion (2792b) extend to the same height and the protruding bead portion (2792c) is formed in a plane. Thereby, the outer inclined bead portion (2792a) can be compressed when assembled between the second surface (138b) of the partition wall and the valve plate (2730), and the inner inclined bead portion (2792b) can be compressed when assembled between the first surface (138a) of the partition wall and the valve plate (2730).

[0044] 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 communicates with the second positioning hole (2727) and through which the positioning pin passes. At this time, the bead portion (2792) surrounds up to the fourth fastening hole (2797) so as to support the fastening force by the fastening bolt (770) and transmit it evenly. Specifically, the fourth fastening hole (2797) is formed radially inward of the outer inclined bead portion (2792a) and is formed at a position overlapping with the inner inclined bead portion (2792b). However, when the inner inclined bead portion (2792b) passes the fourth fastening hole (2797), it is arranged to bypass radially inward and surround the fourth fastening hole (2797).

[0045] Next, as shown in FIGS. 3 and 9, the valve plate (2730) is formed as a circular plate and includes a pair of inclined spaces (2734a, 2734b) in which a pair of retainer portions (2794a, 2794b) are mounted and the refrigerant flowing in through a pair of inlets (2712a, 2712b) is accommodated, and a pair of outlets (2736a, 2736b) that communicate with the pair of inclined spaces and through which the refrigerant flows out. That is, the first inclined space (2734a) has the first retainer portion (2794a) mounted thereon, and after the refrigerant flowing in through the first inlet (2712a) is accommodated, it flows out through the first outlet (2736a). The second inclined space (2734b) has the second retainer portion (2794b) mounted thereon, and after the refrigerant flowing in through the second inlet (2712b) is accommodated, it flows out through the second outlet (2736b). The first inclined space (2734a) and the second inclined space (2734b) are formed to be recessed so as to have an inclination corresponding to the first retainer portion (2794a) and the second retainer portion (2794b), and are formed to be arranged side by side with each other.

[0046] The valve plate (2730) further includes a first protruding portion (2732a) and a second protruding portion (2732b) protruding toward the inlet side of the fixed scroll (500). The first outlet (2736a) penetrates the first protruding portion (2732a) from the first inclined space (2734a), and the second outlet (2736b) penetrates the second protruding portion (2732b) from the second inclined space (2734b). Thereby, the refrigerant flowing out from the outlet (2736) can be supplied to the compression chamber (C) through the inlet of the fixed scroll (500). At this time, so that the refrigerant flowing through the flow hole (2796) can flow out immediately to the outlet (2736) without pressure loss, the first outlet (2736a) is preferably arranged at a position corresponding to the first flow hole (2796a), and the second outlet (2736b) is preferably arranged at a position corresponding to the second flow hole (2796b).

[0047] The valve plate (2730) further includes a fifth fastening hole (2737) for the fastening bolt (770) to penetrate, and a fourth positioning groove (2739) communicating with the third positioning hole (2798) into which a positioning pin is inserted. The fifth fastening hole (2737) of the valve plate is arranged on the radially outer side of the inclined space (2734). Thereby, by inserting the positioning pin through the first positioning hole (2716), the second positioning hole (2727), and the third positioning hole (2798) and inserting it into the fourth positioning groove (2739), the cover plate (2710), the injection valve (2720), the gasket retainer (2790), and the valve plate (2730) can be aligned.

[0048] Further, by the fastening bolt (770) penetrating 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 being fastened to the first fastening groove (138a), the injection valve assembly (2700) can be fastened to the rear housing (130). At this time, since the fastening bolt (770) is disposed on the side of the introduction chamber (I), specifically on the first surface (138a) of the partition wall, there is a risk that the refrigerant may leak through the space past the fastening bolt (770). Therefore, the injection valve assembly can be provided with a sealing portion for sealing between the injection valve assembly (2700) and the head of the fastening bolt (770).

[0049] As shown in FIGS. 3 and 5, the sealing portion (2738) is provided on one surface of the valve plate (2730) to 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. Thereby, while the fastening bolt (770) is being fastened, it strongly meshes with the sealing portion (2738), so that the space between the head of the fastening bolt (770) and one surface of the valve plate (2730) can be sealed, preventing refrigerant leakage. However, the present invention is not limited to this, and it goes without saying that the sealing portion can be formed of a separate O-ring or the like and disposed between the head of the fastening bolt (770) and one surface of the valve plate (2730). The present invention is not limited to the specific embodiments and descriptions described above, and any person having ordinary knowledge in the technical field to which the present invention pertains can make various modified implementations without departing from the gist of the present invention claimed in the claims, and such modifications are within the protection scope of the present invention.

Industrial Applicability

[0050] The present invention relates to a scroll compressor, and more specifically, to a scroll compressor that can improve the performance and efficiency of the compressor by introducing not only the refrigerant at the suction pressure but also the refrigerant at the intermediate pressure into the compression chamber of the scroll compressor and increasing the refrigerant discharge amount discharged from the compression chamber, and can simplify the shape of the injection valve assembly, arrange the fastening bolt on the side of the introduction chamber, and make the injection valve assembly compact while freely changing the position of the port.

Explanation of Reference Numerals

[0051] 100 Housing 110 Center Housing 120 Front housing 130 Rear housing 200 Motor 300 Rotating shaft 400 Swinging scroll 500 Fixed scroll 512 Discharge port 600 Discharge valve 710 Cover plate 712 Inlet port 712a First inlet port 712b Second inlet port 720 Injection valve 722 Head 722a First head 722b Second head 724 Leg 724a First leg 724b Second leg 726 Connecting part 730 Valve plate 732 Protrusion 734 Inclined space 736 Outlet port 739a First fastening hole 739b Second positioning groove 770 Fastening bolt 790 Gasket retainer 792 Bead part 794 Retainer part 795 Wing part 796 Third fastening hole 2700 Injection valve assembly 2730 Valve plate 2737 Base surface 2738 Surface pressure increasing part 2738c Avoidance part 2739 Step 2790 Gasket retainer 2790c Main flow hole 2790d First auxiliary flow hole 2790e Second auxiliary flow hole 2792 Bead part 2792a First half-bead 2792b second half-bead

Claims

1. A housing, A motor provided within the housing, A rotating shaft rotated by the motor, A swivel scroll that is interlocked with the rotating shaft and performs a swiveling motion, and A fixed scroll that forms a compression chamber together with the swivel scroll, The housing includes a rear housing that forms a discharge chamber for accommodating the refrigerant discharged from the compression chamber, The rear housing includes a partition wall that partitions the discharge chamber from an introduction chamber through which the refrigerant flows in 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 guide the refrigerant in the introduction chamber to the compression chamber, The partition wall has a first surface that surrounds a part of the side surface of the injection valve assembly and a second surface that is higher than the first surface, The injection valve assembly includes: A cover plate disposed on the partition wall and having an inlet through which the refrigerant in the introduction chamber flows in, A gasket retainer coupled to the partition wall, An injection valve interposed between the cover plate and the gasket retainer to open and close 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, The scroll compressor, wherein the gasket retainer is coupled to the second surface.

2. The first surface is formed on the inner side in the radial direction of the partition wall with respect to the second surface, and the first surface and the second surface are connected by a third surface facing a part of the side surface of the injection valve assembly. The scroll compressor according to Claim 1.

3. The injection valve assembly is formed in a circular shape, and the fastening bolts for fastening the injection valve assembly to the rear housing are disposed on the first surface. The scroll compressor according to Claim 2.

4. The cover plate is in surface contact with the first surface. The scroll compressor according to Claim 2.

5. The injection valve includes: A main body portion in a circular ring shape, and A valve portion extending from one side of the main body portion toward the inlet. The scroll compressor according to Claim 2.

6. The gasket retainer includes: A main body portion in a circular ring shape, A retainer portion extending from one side of the main body portion so as to incline toward the valve plate approaching the inlet, and The scroll compressor according to claim 2, further comprising a support portion that connects the other side of the main body portion and the retainer portion and supports the retainer portion so as to be inclined.

7. The scroll compressor according to claim 2, wherein the partition wall is formed in a circular shape and protrudes from the rear mirror plate of the rear housing so as to form a space for the introduction chamber inside.

8. The scroll compressor according to claim 2, wherein the height difference (h) between the first surface and the second surface is smaller than the sum of the thickness (t1) of the cover plate and the thickness (t2) of the injection valve.

9. The scroll compressor according to claim 2, wherein the gasket retainer includes a bead portion that protrudes toward the valve plate around it.

10. The scroll compressor according to claim 9, wherein the bead portion is disposed on the radially outer side of the injection valve when the injection valve assembly is assembled.

11. The scroll compressor according to claim 2, wherein fastening grooves are respectively formed around the cover plate and the injection valve so as to be recessed inward in the radial direction because fastening bolts for fastening the injection valve assembly to the rear housing pass through.

12. The scroll compressor according to claim 9, wherein a fastening hole for a fastening bolt for fastening the injection valve assembly to the rear housing is formed in the gasket retainer, and the bead portion surrounds the fastening hole.

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