Scroll compressor

Abstract

Disclosed is a scroll compressor. The scroll compressor includes a casing, an orbiting scroll, and a non-orbiting scroll. A retainer insertion groove, recessed to a preset depth to accommodate a discharge port and a bypass hole, can be formed in the rear surface of the non-orbiting scroll, a bypass valve for opening / closing the bypass hole and a retainer for limiting the opening amount of the bypass valve can be inserted into the retainer insertion groove, and at least one of the bypass valve or the retainer may have an annular shape. Accordingly, the thickness of a non-orbiting end plate can be made thin, and the length of the bypass hole can be shortened to reduce the dead volume in the bypass hole and improve compressor efficiency. Moreover, the manufacture and / or assembly of the bypass valve and / or the retainer can be facilitated.

Description

scroll compressor

[0001] The present invention relates to a bypass valve in a scroll compressor.

[0002] A scroll compressor is a combination of an orbiting scroll and a non-orbiting scroll that are interlocked and combined, and the orbiting scroll orbits the non-orbiting scroll, forming a pair of compression chambers between the orbiting scroll and the non-orbiting scroll.

[0003] The compression chamber consists of a suction chamber formed on the periphery, an intermediate pressure chamber formed continuously with a gradually decreasing volume toward the center from the suction pressure chamber, and a discharge pressure chamber connected to the center of the intermediate pressure chamber. Typically, the suction pressure chamber penetrates the side of the non-orbiting scroll and is connected to the refrigerant suction pipe, the intermediate pressure chamber is sealed and connected in multiple stages, and the discharge pressure chamber penetrates the center of the plate portion of the non-orbiting scroll and is connected to the refrigerant discharge pipe.

[0004] Scroll compressors, with their compression chambers configured to move continuously, can experience overcompression during operation. To address this, conventional compressors typically employ a bypass hole located upstream of the discharge port, preemptively discharging overcompressed refrigerant. A bypass valve is installed in the bypass hole, which opens and closes depending on the pressure within the compression chamber. Bypass valves are typically plate valves or reed valves.

[0005] Patent Document 1 (US Patent Publication No. US2018 / 0038370 A1) discloses a scroll compressor with a bypass valve formed as a plate valve. Patent Document 1 opens and closes multiple bypass holes with a single annular bypass valve. However, this increases the number of components because the bypass valve is supported by an elastic member. Furthermore, Patent Document 1 forms the back pressure chamber assembly integrally with the non-orbiting scroll, which increases the length of the bypass hole. This causes a discharge delay, which can lead to overcompression. In addition, the dead volume in the bypass hole can increase, which can reduce the indicated efficiency.

[0006] Patent Document 2 (Korean Patent Publication No. 10-2014-0114212) discloses a scroll compressor with a bypass valve formed as a reed valve. Patent Document 2 has a problem in that the retainer portion, which limits the opening amount of the bypass valve, is formed integrally with the back pressure chamber assembly, making it difficult to manufacture the back pressure chamber assembly. Furthermore, this increases flow resistance, potentially resulting in discharge loss.

[0007] Patent Document 3 (US Patent Publication No. US2015 / 0345493 A1) discloses a scroll compressor with a bypass valve formed as a reed valve, similar to Patent Document 2. Patent Document 3 is disadvantageous for modularization because the bypass valve and the retainer that limits the opening amount of the bypass valve are assembled separately, and this increases the number of parts, which may increase the assembly time.

[0008] The purpose of the present invention is to provide a scroll compressor capable of reducing dead volume while suppressing overcompression in a compression chamber.

[0009] Another object of the present invention is to provide a scroll compressor capable of reducing the dead volume in the bypass hole by reducing the length of the bypass hole.

[0010] Another object of the present invention is to provide a scroll compressor capable of stably supporting a bypass valve and a retainer that limits the opening amount of the bypass valve while reducing the length of the bypass hole.

[0011] Another object of the present invention is to provide a scroll compressor in which a plurality of bypass valves and a plurality of retainers for limiting the opening amount of the bypass valves can be easily and stably assembled.

[0012] Another object of the present invention is to provide a scroll compressor capable of securing a wide discharge guide passage while fixing a retainer without a separate fastening member.

[0013] Another object of the present invention is to provide a scroll compressor in which a portion for fixing a bypass valve is formed in a circular shape to improve processability.

[0014] Another object of the present invention is to provide a scroll compressor in which a portion for fixing a bypass valve is formed in a circular shape while allowing a plurality of bypass valves to secure a sufficient opening / closing area.

[0015] In order to achieve the object of the present invention, a scroll compressor including a casing, an orbiting scroll, and a non-orbiting scroll may be provided. The orbiting scroll may be coupled to a rotating shaft in an internal space of the casing and may perform an orbiting motion. The non-orbiting scroll may be engaged with the orbiting scroll to form a compression chamber, and may be provided with a discharge port and a bypass hole to discharge refrigerant in the compression chamber. The back pressure chamber assembly may be coupled to a rear surface of the non-orbiting scroll to pressurize the non-orbiting scroll toward the orbiting scroll. A retainer insertion groove portion that accommodates the discharge port and the bypass hole and is recessed to a preset depth may be formed on the rear surface of the non-orbiting scroll, and a bypass valve for opening and closing the bypass hole and a retainer for limiting an opening amount of the bypass valve may be inserted into the retainer insertion groove portion. At least one of the bypass valve and the retainer may be formed in an annular shape. Through this, since the bypass valve and retainer are fixed to the non-rotating plate without a separate fastening member, the non-rotating plate can be formed to be thin, and as the thickness of the non-rotating plate is reduced, the length of the bypass hole is shortened, so that the dead volume in the bypass hole is reduced, thereby improving the compressor efficiency. In addition, since the bypass valve and / or retainer are formed as a single member, the manufacturing and / or assembly of the bypass valve and / or retainer can be facilitated.

[0016] For example, the bypass hole may be provided in multiple numbers and formed around the discharge port. The bypass valve may include a plurality of fixed parts, a plurality of elastic parts, and a plurality of valve parts. The plurality of fixed parts may be fixed to the non-orbiting scroll by the retainer. The plurality of elastic parts may extend circumferentially from the plurality of fixed parts. The plurality of valve parts may open and close the bypass hole by connecting the plurality of elastic parts facing each other. Through this, the plurality of bypass valves may be connected to each other and formed as a single member, thereby facilitating the manufacturing and / or assembly of the bypass valve.

[0017] For example, a first center line connecting the centers of the plurality of fixed parts and a second center line connecting the centers of the plurality of valve parts may be formed to intersect each other. The bypass valve may be formed symmetrically with respect to the first center line and the second center line. Through this, the bypass valve can have a plurality of opening / closing parts uniformly opened / closed while forming the plurality of elastic parts with the same length.

[0018] In addition, the retainer may include a plurality of valve fixing portions, a plurality of connecting supports, and a plurality of valve supports. The plurality of valve fixing portions may respectively fix the plurality of fixing portions to the non-orbiting scroll. The plurality of connecting supports may extend circumferentially from the plurality of valve fixing portions and may be spaced apart from the non-orbiting scroll. The plurality of valve supports may connect the plurality of connecting supports facing each other and be spaced apart from the non-orbiting scroll, and may limit the opening amount of the plurality of valve portions. Through this, the plurality of retainers may be connected to each other and formed as a single member, thereby facilitating the manufacturing and / or assembly of the retainer.

[0019] Specifically, the third center line connecting the centers of the plurality of valve fixing parts and the fourth center line connecting the centers of the plurality of valve supports may be formed to intersect each other. The retainer may be formed symmetrically with respect to the third center line and the fourth center line. Through this, each opening / closing part of the bypass valve can be uniformly opened / closed while the plurality of connecting support parts are formed identically.

[0020] More specifically, the plurality of connecting supports and the plurality of valve supports may be formed into a curved surface so as to be wound in a direction toward the third center line. This allows the opening and closing portion of the bypass valve to open and close stably, thereby improving the reliability of the bypass valve.

[0021] In addition, the bypass valve may have a fixing hole formed in each of the plurality of fixing parts. The retainer may have a fixing projection formed in each of the plurality of valve fixing parts, which is inserted into the fixing hole of the bypass valve. Through this, the bypass valve can be stably fixed to the non-rotating scroll together with the retainer.

[0022] Specifically, a fixing groove is formed in the non-orbiting scroll so that the fixing projection of the retainer is inserted, and the depth of the fixing groove can be formed to be smaller than the length of the bypass hole. Through this, the thickness of the non-orbiting plate portion can be formed thin, while the bypass valve can be stably fixed to the non-orbiting scroll together with the retainer.

[0023] As another example, a support member for supporting the retainer may be provided on the inner surface of the retainer insertion groove. This allows the bypass hole and the discharge port to maintain a certain distance from the intermediate discharge port, thereby minimizing the flow resistance of the refrigerant discharged through the discharge port and the bypass hole.

[0024] For example, the support member may include a first support member and a second support member. The first support member is formed in an annular shape and is slidably inserted into the inner surface of the retainer insertion groove, and the second support member is provided on the opposite side of the retainer with respect to the first support member and may be fixed to the inner surface of the retainer insertion groove. Through this, the bypass valve including the retainer can be easily and stably fixed to the non-orbiting scroll by the retainer support member.

[0025] As another example, a back pressure projection may be formed on the back surface of the non-orbiting scroll, which extends as a single body toward a back pressure chamber assembly that pressurizes the non-orbiting scroll toward the orbiting scroll, and which has the retainer insertion groove formed on its inner surface. A back pressure hole communicating with the compression chamber may be formed through an end surface of the back pressure projection. The back pressure chamber assembly may be formed of a floating plate that is slidably inserted into the back pressure projection and forms a back pressure chamber together with the end surface of the back pressure projection. Through this, not only can the back pressure chamber assembly (160) be simplified, but also the back pressure chamber assembly does not need to be fastened to the non-orbiting scroll, so that the thickness of the non-orbiting plate portion can be reduced.

[0026] For example, the floating plate may include an outer sealing portion, an inner sealing portion, and a connecting sealing portion. The outer sealing portion may be slidably inserted into an outer surface of the back pressure projection portion, the inner sealing portion may be slidably inserted into an inner surface of the back pressure projection portion, and the connecting sealing portion may connect between the outer sealing portion and the inner sealing portion. A back pressure space portion may be formed to be sunken on one side of the connecting sealing portion facing the back pressure projection portion. Through this, not only is the back pressure room tightly sealed, but even when the floating plate is in close contact with the back pressure projection portion, a back pressure room may be formed between the floating plate and the back pressure projection portion.

[0027] Specifically, an intermediate discharge port communicating with the discharge port may be formed on the inner circumference of the inner sealing portion. A valve guide portion may be formed on the inner circumference of the intermediate discharge port, into which a discharge valve for opening and closing the discharge port is slidably inserted. This simplifies the back pressure chamber assembly while maintaining stable operation of the discharge valve.

[0028] As another example, the non-orbiting scroll may be coupled with a back pressure chamber assembly that pressurizes the non-orbiting scroll toward the orbiting scroll. The back pressure chamber assembly may be composed of a back pressure plate and a floating plate. The back pressure plate may be coupled to the back surface of the non-orbiting scroll at the outer edge of the retainer insertion groove, and a back pressure hole communicating with the compression chamber may be formed. The floating plate may be slidably inserted into the back pressure plate to form a back pressure chamber between the floating plate and the non-orbiting scroll. Through this, the floating plate may be further simplified and operate quickly, thereby quickly separating the low-pressure portion and the high-pressure portion of the casing.

[0029] Specifically, the back pressure plate may be formed with an intermediate discharge port that is in communication with the discharge port. A valve receiving portion may be formed on the inner circumference of the intermediate discharge port, into which a discharge valve for opening and closing the discharge port is slidably inserted. Through this, as the discharge valve is slidably inserted into the back pressure plate that is connected to the non-rotating scroll, the behavior of the discharge valve becomes more stable, thereby improving compression efficiency.

[0030] A scroll compressor according to the present invention comprises a casing, an orbiting scroll, and a non-orbiting scroll, wherein a retainer insertion groove is formed on the back surface of the non-orbiting scroll to accommodate a discharge port and a bypass hole and to be sunken to a preset depth, and a bypass valve for opening and closing the bypass hole and a retainer for limiting the opening amount of the bypass valve are inserted into the retainer insertion groove, and at least one of the bypass valve and the retainer may be formed in an annular shape. Through this, the thickness of the non-orbiting plate portion can be formed thin, the length of the bypass hole can be shortened, and the dead volume in the bypass hole can be reduced, thereby improving compressor efficiency, and manufacturing and / or assembling the bypass valve and / or the retainer can be facilitated.

[0031] A scroll compressor according to the present invention comprises a bypass valve comprising a plurality of fixed members, a plurality of elastic members, and a plurality of valve members, wherein the plurality of fixed members, the plurality of elastic members, and the plurality of opening / closing members are connected to form an annular shape. This allows the plurality of bypass valves to be connected to each other and formed into a single member, thereby facilitating the manufacture and / or assembly of the bypass valve.

[0032] A scroll compressor according to the present invention comprises a retainer comprising a plurality of valve fixing portions, a plurality of connection support portions, and a plurality of valve support portions, wherein the plurality of valve fixing portions, the plurality of connection support portions, and the plurality of valve support portions can be interconnected. This allows the plurality of retainers to be interconnected to form a single member, thereby facilitating the manufacture and / or assembly of the retainer.

[0033] According to the present invention, a scroll compressor is provided with a back pressure projection formed on a non-orbiting scroll that extends as a single body toward a back pressure chamber assembly, and a floating plate that forms a back pressure chamber together with an end face of the back pressure projection can be slidably inserted into the back pressure projection. This not only simplifies the back pressure chamber assembly (160), but also reduces the thickness of the non-orbiting plate portion by eliminating the need to fasten the back pressure chamber assembly to the non-orbiting scroll.

[0034] A scroll compressor according to the present invention may comprise a back pressure chamber assembly comprising a back pressure plate connected to a non-rotating scroll and a floating plate slidably inserted into the back pressure plate to form a back pressure chamber. This allows the floating plate to be further simplified and operate quickly, thereby quickly separating the low-pressure and high-pressure sections of the casing.

[0035] Fig. 1 is a longitudinal cross-sectional view showing the inside of a scroll compressor according to the present invention.

[0036] Figure 2 is a perspective view of the non-rotating scroll and back pressure chamber assembly in Figure 1, seen from above, disassembled.

[0037] Figure 3 is a perspective view showing a portion of the non-rotating scroll and back pressure assembly in Figure 1 disassembled from below.

[0038] Fig. 4 is a cross-sectional view showing the assembled non-rotating scroll and back pressure chamber assembly of Fig. 1.

[0039] Fig. 5 is a perspective view showing the bypass valve and retainer separated from the non-rotating scroll in Fig. 1.

[0040] Fig. 6 is a plan view showing the bypass valve and retainer assembled to the non-rotating scroll in Fig. 5.

[0041] Figure 7 is a cross-sectional view taken along line “Ⅶ-Ⅶ” of Figure 6.

[0042] Fig. 8 is a cross-sectional view showing another embodiment of a pressure chamber assembly.

[0043] Fig. 9 is a perspective view showing a part of the non-rotating scroll and back pressure assembly in Fig. 8 disassembled from below.

[0044] Fig. 10 is a cross-sectional view showing the assembled non-rotating scroll and back pressure chamber assembly of Fig. 8.

[0045] Hereinafter, a scroll compressor according to the present invention will be described in detail based on an embodiment illustrated in the attached drawings.

[0046] Typically, scroll compressors can be categorized as open or sealed types depending on whether the drive unit (transmission unit) and the compression unit are installed together in the internal space of the casing. The former is a type in which the transmission unit forming the drive unit is installed separately from the compression unit, while the sealed type is a type in which the transmission unit is installed within the same casing as the compression unit. The following description will use a sealed scroll compressor as an example, but is not necessarily limited to a sealed scroll compressor. In other words, the present invention can be equally applied to an open scroll compressor in which the transmission unit and the compression unit are separated.

[0047] In addition, scroll compressors are classified into low-pressure compressors and high-pressure compressors depending on the pressure part formed by the internal space of the casing, particularly the space accommodating the electric motor in a hermetic scroll compressor. In the former, the space forms a low-pressure part, and the refrigerant suction pipe is connected to the space, and in the latter, the space forms a high-pressure part, and the refrigerant suction pipe penetrates the casing and is directly connected to the compression part. This embodiment is described using a low-pressure scroll compressor as an example. However, it is not limited to the low-pressure scroll compressor.

[0048] In addition, scroll compressors can be divided into vertical scroll compressors in which the rotation axis is arranged perpendicular to the ground and horizontal scroll compressors in which the rotation axis is arranged parallel to the ground. For example, in a vertical scroll compressor, the upper side can be defined as the side opposite to the ground, and the lower side can be defined as the side facing the ground. The following description will be given using a vertical scroll compressor as an example. However, the same or similar application can be applied to a horizontal scroll compressor. Therefore, the axial direction is understood as the axial direction of the rotation axis, the radial direction is understood as the radial direction of the rotation axis, and the axial direction can be understood as the up-down direction, the radial direction can be understood as the left and right sides, the inner surface can be understood as the upper surface, and the axial radial direction can be understood as the side, respectively.

[0049] FIG. 1 is a longitudinal cross-sectional view showing the inside of a scroll compressor according to the present invention, FIG. 2 is a perspective view showing the non-orbiting scroll and the back pressure chamber assembly in FIG. 1 disassembled and viewed from above, FIG. 3 is a perspective view showing a part of the non-orbiting scroll and the back pressure chamber assembly in FIG. 1 disassembled and viewed from below, and FIG. 4 is a cross-sectional view showing the non-orbiting scroll and the back pressure chamber assembly in FIG. 1 assembled.

[0050] Referring to FIG. 1, in the scroll compressor according to the present embodiment, a driving motor (120) forming an electric power unit is installed in the lower half of a casing (110), and a main frame (130), a rotating scroll (140), a non-rotating scroll (150), a back pressure chamber assembly (160), and a valve assembly (170) forming a compression unit are installed in the upper part of the driving motor (120). The electric power unit is coupled to one end of a rotating shaft (125), and the compression unit is coupled to the other end of the rotating shaft (125). Accordingly, the compression unit is connected to the electric power unit by the rotating shaft (125) and operates by the rotational force of the electric power unit.

[0051] Referring to FIG. 1, the casing (110) according to the present embodiment may include a cylindrical shell (111), an upper cap (112), and a lower cap (113).

[0052] The cylindrical shell (111) has a cylindrical shape with both upper and lower ends open, and the aforementioned driving motor (120) and main frame (130) are inserted and fixed to the inner surface. A terminal bracket (not shown) is coupled to the upper half of the cylindrical shell (111). A terminal (not shown) for transmitting external power to the driving motor (120) is coupled through the terminal bracket. In addition, a refrigerant suction pipe (117), which will be described later, is coupled through the upper half of the cylindrical shell (111), for example, the upper side of the driving motor (120).

[0053] The upper cap (112) is coupled to cover the opened upper part of the cylindrical shell (111). The lower cap (113) is coupled to cover the opened lower part of the cylindrical shell (111). The rim of a high-low pressure separation plate (115), which will be described later, is inserted between the cylindrical shell (111) and the upper cap (112) and is welded together to the cylindrical shell (111) and the upper cap (112). The rim of a support bracket (116), which will be described later, can be inserted between the cylindrical shell (111) and the lower cap (113) and is welded together to the cylindrical shell (111) and the lower cap (113). Accordingly, the internal space of the casing (110) is sealed.

[0054] The rim of the high-low pressure separator (115) is welded to the casing (110) as described above. The central portion of the high-low pressure separator (115) is bent so as to protrude toward the upper surface of the upper cap (112) and is placed on the upper side of the back pressure chamber assembly (160) to be described later. A refrigerant suction pipe (117) is connected to the lower side of the high-low pressure separator (115), and a refrigerant discharge pipe (118) is connected to the upper side. Accordingly, a low pressure portion (110a) forming a suction space can be formed on the lower side of the high-low pressure separator (115), and a high pressure portion (110b) forming a discharge space can be formed on the upper side.

[0055] In addition, a through hole (115a) may be formed in the center of the high-low pressure separator (115). A sealing plate (1151) into which a floating plate (165) to be described later is detachably attached is inserted and coupled into the through hole (115a). The low-pressure section (110a) and the high-pressure section (110b) may be blocked by attaching or detaching the floating plate (165) and the sealing plate (1151), or may be communicated through the high-low pressure communication hole (1151a) of the sealing plate (1151).

[0056] In addition, the lower cap (113) forms an oil storage space (110c) together with the lower half of the cylindrical shell (111) forming the low-pressure portion (110a). In other words, the oil storage space (110c) is formed in the lower half of the low-pressure portion (110a), and the oil storage space (110c) forms a part of the low-pressure portion (110a).

[0057] Referring to Fig. 1, the driving motor (120) according to the present embodiment is installed in the lower half of the low-pressure portion (110a) and may include a stator (121) and a rotor (122). The stator (121) is fixed to the inner wall surface of the cylindrical shell (111) by hot pressing, and the rotor (122) may be rotatably provided inside the stator (121).

[0058] The stator (121) may include a stator core (1211) and a stator coil (1212).

[0059] The stator core (1211) is formed in a cylindrical shape and is fixed to the inner surface of the cylindrical shell (111) by hot pressing. The stator coil (1212) is wound around the stator core (1211) and is electrically connected to an external power source through a terminal (not shown) that is connected through the casing (110).

[0060] The rotor (122) may include a rotor core (1221) and a permanent magnet (1222).

[0061] The rotor core (1221) is formed in a cylindrical shape and is rotatably inserted into the interior of the stator core (1211) at a predetermined gap interval. Permanent magnets (1222) are embedded in the interior of the rotor core (1222) at a predetermined gap interval along the circumference.

[0062] In addition, a rotation shaft (125) is press-fitted and coupled to the center of the rotor core (1221). An orbiting scroll (140), which will be described later, is eccentrically coupled to the upper end of the rotation shaft (125). Accordingly, the rotational force of the driving motor (120) can be transmitted to the orbiting scroll (140) through the rotation shaft (125).

[0063] An eccentric portion (1251) that is eccentrically coupled to a rotating scroll (140) to be described later may be formed at the upper end of the rotating shaft (125). An oil pickup (126) for sucking up oil stored in the lower part of the casing (110) may be installed at the lower end of the rotating shaft (125). The rotating shaft (125) may be formed with an oil passage (1252) extending axially therethrough.

[0064] Referring to FIG. 1, the main frame (130) according to the present embodiment is installed on the upper side of the driving motor (120) and is fixed by hot pressing or welding to the inner wall surface of the cylindrical shell (111).

[0065] The main frame (130) according to the present embodiment may include a main flange portion (131), a main bearing portion (132), a rotation space portion (133), a scroll side support portion (134), an old ring support portion (135), and a frame fixing portion (136).

[0066] The main flange portion (131) is formed in an annular shape and can be accommodated in the low pressure portion (110a) of the casing (110). For example, the outer diameter of the main flange portion (131) is formed smaller than the inner diameter of the cylindrical shell (111), so that the outer surface of the main flange portion (131) can be spaced apart from the inner surface of the cylindrical shell (111). However, a frame fixing portion (136), which will be described later, can protrude radially from the outer surface of the main flange portion (131). The outer surface of the frame fixing portion (136) can be fixedly attached to the inner surface of the casing (110). Accordingly, the frame (130) can be fixedly coupled to the casing (110).

[0067] The main bearing portion (132) may protrude downward from the central lower surface of the main flange portion (131) toward the driving motor (120). The main bearing portion (132) may have a cylindrical shaft hole (132a) that may penetrate axially. A rotation shaft (125) may be inserted into the inner circumferential surface of the shaft hole (132a) and supported radially.

[0068] The pivot space (133) can be sunk from the center of the main flange (131) toward the main bearing (132) to a preset depth and outer diameter. The pivot space (133) can be formed to be larger than the outer diameter of the rotation shaft coupling (143) provided in the pivot scroll (140) described later. Accordingly, the rotation shaft coupling (143) can be accommodated so as to be pivotable within the pivot space (133).

[0069] The scroll side support portion (134) can be formed in a ring shape along the periphery of the pivot space portion (133) on the upper surface of the main flange portion (131). Accordingly, the scroll side support portion (134) can axially support the lower surface of the pivot plate portion (141) described later.

[0070] The Oldham ring support member (135) can be formed in a ring shape along the outer circumference of the scroll side support member (134) on the upper surface of the main flange member (131). Accordingly, the Oldham ring (139) can be inserted into the Oldham ring support member (135) and rotatably accommodated.

[0071] The frame fixing member (136) may extend radially from the outer edge of the old ring support member (135). The frame fixing member (136) may extend in an annular shape or may extend as a plurality of protrusions spaced apart at predetermined intervals along the circumferential direction. In the present embodiment, an example in which the frame fixing member (136) is formed as a plurality of protrusions along the circumferential direction is illustrated.

[0072] Referring to FIG. 1, the orbiting scroll (140) according to the present embodiment may be coupled to a rotation shaft (125) and provided between the main frame (130) and the non-orbiting scroll (150). An anti-rotation mechanism, an Oldham ring (139), may be provided between the main frame (130) and the orbiting scroll (140). Accordingly, the orbiting scroll (140) is restrained from rotating and performs an orbiting motion with respect to the non-orbiting scroll (150).

[0073] Specifically, the rotating scroll (140) may include a rotating plate portion (141), a rotating wrap (142), and a rotating shaft coupling portion (143).

[0074] The pivot plate (141) can be formed in a roughly circular shape. The outer diameter of the pivot plate (141) can be supported in the axial direction by being placed on the scroll side support (134) of the frame (130). Accordingly, the pivot plate (141) and the scroll side support (134) facing it form an axial bearing surface (not shown).

[0075] The orbiting wrap (142) may be formed in a spiral shape by protruding at a preset height from the upper surface of the orbiting plate (141) facing the non-orbiting scroll (150). The orbiting wrap (142) may be formed corresponding to the non-orbiting wrap (152) of the non-orbiting scroll (150) to perform an orbiting motion by interlocking with the non-orbiting wrap (152). Accordingly, the orbiting wrap (142) forms a compression chamber (V) together with the non-orbiting wrap (152).

[0076] The compression chamber (V) may be composed of a first compression chamber (V1) and a second compression chamber (V2) based on the orbital wrap (142). The first compression chamber (V1) and the second compression chamber (V2) may each be formed in series with a suction pressure chamber (not symbolized), an intermediate pressure chamber (not symbolized), and a discharge pressure chamber (not symbolized). Hereinafter, the compression chamber formed between the outer surface of the orbital wrap (142) and the inner surface of the non-orbital wrap (152) facing it is defined as the first compression chamber (V1), and the compression chamber formed between the inner surface of the orbital wrap (142) and the outer surface of the non-orbital wrap (152) facing it is defined as the second compression chamber (V2).

[0077] The rotary shaft coupling portion (143) can be formed to protrude from the lower surface of the pivot plate portion (141) toward the main frame (130). The rotary shaft coupling portion (143) is formed in a cylindrical shape, and a pivot bearing (not shown) made of a bushing bearing can be press-fitted therein.

[0078] Referring to FIGS. 1 to 3, the non-orbiting scroll (150) according to the present embodiment may be placed on the upper portion of the main frame (130) with the orbiting scroll (140) interposed therebetween. The non-orbiting scroll (150) may be fixedly coupled to the main frame (130) or may be coupled so as to be movable in the vertical direction. The present embodiment illustrates an example in which the non-orbiting scroll (150) is coupled so as to be movable in the axial direction with respect to the main frame (130).

[0079] A non-orbiting scroll (150) according to the present embodiment may include a non-orbiting plate portion (151), a non-orbiting wrap (152), a non-orbiting side wall portion (153), a guide projection portion (154), and a back pressure projection portion (155).

[0080] The non-rotating plate portion (151) may be formed in a disc shape and may be arranged laterally in the low-pressure portion (110a) of the casing (110). A discharge port (1511) and a bypass hole (1512) may be formed to penetrate axially in the central portion of the non-rotating plate portion (151), that is, in the retainer receiving groove portion (156) described later. The discharge port (1511) may be formed in the center of the non-rotating plate portion (151), and the bypass hole (1512) may be formed to communicate with a compression chamber (V) having a lower pressure than the pressure of the compression chamber (V) to which the discharge port (1511) is connected.

[0081] The discharge port (1511) may be formed at a location where the discharge pressure chamber (not symbolized) of the first compression chamber (V1) and the discharge pressure chamber (not symbolized) of the second compression chamber (V2) are connected to each other. Accordingly, the refrigerant compressed in the first compression chamber (V1) and the refrigerant compressed in the second compression chamber (V2) are combined in the discharge pressure chamber and discharged to the high pressure section (110b), which is the discharge space, through the discharge port (1511).

[0082] The bypass hole (1512) may include a first bypass hole (1512a) and a second bypass hole (1512b). The first bypass hole (1512a) and the second bypass hole (1512b) may be formed as one hole each, or as multiple holes each. The present embodiment illustrates an example in which the first bypass hole (1512a) and the second bypass hole (1512b) are formed as multiple holes each. Accordingly, the area of ​​the entire bypass hole (1512) can be expanded while being formed as holes smaller than the thickness of the turning wrap (142).

[0083] For example, the first bypass hole (1512a) may be connected to the first compression chamber (V1), and the second bypass hole (1512b) may be connected to the second compression chamber (V2). The first bypass hole (1512a) and the second bypass hole (1512b) may be formed on both sides of the discharge port (1511) along the circumferential direction with the discharge port (1511) at the center, that is, on the suction side relative to the discharge port (1511). Accordingly, when the refrigerant compressed in each compression chamber (V1) (V2) is overcompressed, the refrigerant may be bypassed in advance before reaching the discharge port (1511), thereby suppressing overcompression.

[0084] The first bypass hole (1512a) and the second bypass hole (1512b) can be accommodated on the inner side of the back pressure projection (155) to be described later. In other words, a back pressure projection (155) that protrudes by a preset height is formed on the back surface (151a) of the non-rotating plate (151) facing the floating plate (165) forming the back pressure chamber assembly (160) to be described later, and the retainer receiving groove (156) described above can be formed by being recessed by a preset depth in the center of the back pressure projection (155). Accordingly, the first bypass hole (1512a) and the second bypass hole (1512b) can be formed on the inside of the retainer receiving groove (156) together with the discharge port (1511). The retainer receiving home portion (156) will be described again later together with the back pressure projection portion (155).

[0085] The non-rotating wrap (152) can be formed to extend axially from the lower surface of the non-rotating plate portion (151). The non-rotating wrap (152) is formed in a spiral shape inside the non-rotating side wall portion (153), and can be formed to correspond to the rotating wrap (142) so as to be interlocked with the rotating wrap (142).

[0086] The non-rotating side wall portion (153) may be formed in a ring shape by extending axially from the lower edge of the non-rotating plate portion (151) to surround the non-rotating wrap (152). A suction port (1531) penetrating radially may be formed on one side of the outer circumferential surface of the non-rotating side wall portion (153). Accordingly, the first compression chamber (V1) and the second compression chamber (V2) compress the suctioned refrigerant while their volumes become narrower from the outer periphery to the center.

[0087] The guide protrusion (154) may extend radially from the lower outer circumference of the non-rotating side wall (153). The guide protrusion (154) may be formed in a single ring shape, or a plurality of guide protrusions (154) may be formed at predetermined intervals along the circumference. This embodiment will be described with reference to an example in which a plurality of guide protrusions (154) are formed at predetermined intervals along the circumference.

[0088] The back pressure projection (155) is formed by slidingly inserting a floating plate (165) to be described later to form a back pressure chamber (160a) together with the floating plate (165), and may be formed by protruding toward the high-low pressure separation plate (115) from the back surface (151a) of the non-rotating plate portion (151). For example, the back pressure projection (155) may be formed in an annular shape along the circumference on the back surface (151a) of the non-rotating plate portion (151). Accordingly, the back pressure chamber assembly (160) to be described later is formed only by the floating plate (165), so that the back pressure chamber assembly (160) can be simplified, and the back pressure chamber assembly (160) does not have to be fastened to the non-rotating scroll (150), so that the thickness of the non-rotating plate portion (151) can be reduced.

[0089] For example, the back pressure projection (155) may be formed in a circular shape with a preset height and width. Accordingly, the production of the back pressure projection (155) and / or the floating plate (165) described later may be facilitated. However, in some cases, the back pressure projection (155) may be formed in a polygonal shape. In this case, the shape of the retainer receiving groove (156) described later can be optimized.

[0090] Referring to FIG. 4, the back pressure projection (155) can be formed to a height that can secure the length of the valve guide (165d) to be described later while allowing the floating plate (165) to be described later to move along the axial direction, while also securing the sealing length for the back pressure chamber (160a). For example, the inner circumferential height of the back pressure projection (155) can be formed to be lower than or equal to the outer circumferential height of the back pressure projection (155). In other words, the inner circumferential depth of the back pressure projection (155) can be formed to be greater than or equal to the outer circumferential depth of the back pressure projection (155). Accordingly, the thickness of the non-orbiting plate (151) on the outer circumferential side of the back pressure projection (155) can be formed as thin as possible, thereby lowering the manufacturing cost and reducing the weight of the scroll compressor including the non-orbiting scroll (150). In addition, by forming the thickness of the non-rotating plate (151) on the inner side of the back pressure projection (155) as thin as possible, the lengths (L2) of the first bypass hole (1512a) and the second bypass hole (1512b) can be shortened, while the thickness of the retainer receiving groove (156) can be appropriately secured, so that the retainer (173) described later can be stably fixed.

[0091] In addition, a back pressure hole (1551) may be formed in the back pressure projection (155) that penetrates from the compression chamber (V) to the end surface of the back pressure projection (155). Only one back pressure hole (1551) may be formed, or a plurality of back pressure holes may be formed so as to be connected to a plurality of compression chambers (V1) (V2). The former is easy to manufacture the back pressure hole (1551) and can secure a constant back pressure, and the latter can appropriately control the pressure in the back pressure chamber (160a). This embodiment illustrates an example in which one back pressure hole (1551) is formed.

[0092] Although not shown in the drawing, the back pressure hole (1551) may be provided with a back pressure control valve (not shown) that selectively opens and closes the back pressure hole (1551). In this case, the pressure in the back pressure chamber (160a) can be maintained at a constant level, thereby reducing pressure pulsation within the back pressure chamber (160a).

[0093] In addition, the retainer receiving groove (156) described above may be formed on the inner surface of the back pressure projection (155). In other words, since the back pressure projection (155) is formed in an annular shape, a circular space is formed on the inner surface of the back pressure projection (155), and this circular space may form the retainer receiving groove (156) described above. The discharge port (1511) and bypass hole (1512) described above may be formed on the inside of the retainer receiving groove (156), that is, on the bottom surface of the retainer receiving groove (156).

[0094] The retainer receiving groove (156) according to the present embodiment can be formed to be recessed to a predetermined depth in the back surface (151a) of the non-rotating plate (or non-rotating scroll) (151), more precisely, in the center of the back pressure projection (155). Accordingly, the retainer receiving groove (156) is formed of a retainer seating surface (1561) forming the bottom surface and a retainer receiving surface (1562) forming the inner circumferential surface (side wall surface) of the retainer receiving groove (156) and surrounding the retainer seating surface (1561).

[0095] The retainer mounting surface (1561) is formed flat, so that the discharge port (1511) and the bypass hole (1512a) (1512b) described above can be formed, respectively. In other words, the discharge port (1511) and the bypass hole (1512a) (1512b) can be formed by penetrating the retainer mounting surface (1561) in the axial direction. Accordingly, the discharge port (1511) and the bypass hole (1512a) (1512b) can be formed inside the retainer receiving groove (156) as described above.

[0096] In addition, a plurality of retainer fixing grooves (1561a) (1561b) for fixing a bypass valve (172) and a retainer (173) to be described later may be formed on the retainer mounting surface (1561). In other words, the first retainer fixing groove (1561a) and the second retainer fixing groove (1561b) may be formed to be recessed in the axial direction on both sides with the discharge port (1511) as the center by a preset depth. Accordingly, the first fixing projection (1731a) and the second fixing projection (1732a) of the retainer (173) to be described later can pass through the first fixing hole (1721d) of the first bypass valve (1721) to be described later and the second fixing hole (1722d) of the second bypass valve (1722), respectively, and be inserted into the first retainer fixing groove (1561a) and the second retainer fixing groove (1561b).

[0097] In this case, the depth of the retainer fixing groove (1561a)(1561b) can be formed to be smaller than the length (L2) of the bypass hole (1512a)(1512b). Accordingly, while the thickness of the non-rotating plate portion (151) can be formed thin, the bypass valve (172) can be stably fixed to the non-rotating scroll (150) together with the retainer (173).

[0098] The retainer fixing groove (1561a)(1561b) may be formed in a circular cross-section shape, but may also be formed in a polygonal cross-section shape in some cases. In the former case, the fixing hole (1721d)(1722d) of the bypass valve (172) and the fixing projection (1731d)(1731d) of the retainer (173), which will be described later, as well as the retainer fixing groove (1561a)(1561b) can be easily formed, whereas in the latter case, the bypass valve (172) and the retainer (173) can be fixed more stably.

[0099] Referring to FIG. 4, when the discharge port (1511) and the bypass hole (1512) are formed inside the retainer receiving groove (156) as in the present embodiment, the length (L1) of the discharge port (1511) and the length (L2) of the bypass hole (1512) become shorter. In this case, the length (L1) of the discharge port (1511) and the length (L2) of the bypass hole (1512) may be formed to be smaller than or approximately equal to the thickness (D1) of the non-rotating plate portion (151). For example, in the case where the floating plate (165) forming the back pressure chamber assembly (160) described later as in the present embodiment is slidably inserted into the back pressure projection (155) extending as a single body from the back surface of the non-rotating plate portion (151), there is no need to fasten the back pressure chamber assembly (160) to the back surface of the non-rotating plate portion (151). Accordingly, the thickness of the non-rotating plate portion (151), that is, the thickness of the non-rotating plate portion (151) on the outer side of the back pressure projection (155), can be formed thin, so that the entire thickness of the non-rotating plate portion (151), including the retainer receiving groove portion (156), can be formed thin. In this case, when the first bypass valve (1721) and the second bypass valve (1722) to be described later are opened and closed by being attached and detached to the upper surfaces of the first bypass hole (1512a) and the second bypass hole (1512b), respectively, the length (L2) (L2) of each bypass hole (1512a) (1512b) is shortened, so that the volume of each bypass hole (1512a) (1512b) is reduced, and thus the dead volume can be reduced. This also applies when the bypass valve (172) is formed as a piston valve.

[0100] The retainer receiving surface (1562) according to the present embodiment can be formed into a circular cross-section when projected axially. For example, the retainer receiving surface (1562) can be formed into a circular cross-section with the center of the discharge port (1511) as the center of the circle. Accordingly, the retainer receiving groove (156) including the retainer receiving surface (1562) can be easily formed.

[0101] Specifically, the retainer receiving surface (1562) is formed in a circular cross-section shape when projected in the axial direction, and the inner diameter of the retainer receiving surface (1562) can be formed to be larger than the diameter of an imaginary circle (not shown) connecting the inner surface of the intermediate discharge port (1612a). Accordingly, even though the retainer receiving surface (1562) is formed in a circular cross-section shape, the discharge guide passage (F) to be described later formed by the inner surface of the retainer receiving surface (1562) can be smoothly connected to the intermediate discharge port (165c).

[0102] In this case, the inner sealing portion (1652) of the floating plate (165) to be described later may be formed to be spaced apart from the retainer (173), or more precisely, from the retainer support member (174) to be described later, by a predetermined distance. Accordingly, the bypass hole (1512a)(1512b) as well as the discharge port (1511) are maintained at a certain distance from the intermediate discharge port (165c), thereby minimizing the flow resistance of the refrigerant discharged through the discharge port (1511) and the bypass hole (1512a)(1512b).

[0103] In addition, in this case, a retainer support groove (155a) may be formed on the inner surface of the back pressure protrusion (155) into which a retainer support member (174) to be described later is inserted and fixed. The retainer support groove (155a) is formed in an annular shape, into which a retainer support member (174) to be described later can be inserted and fixed. Accordingly, the retainer (173) can be stably supported by the retainer support member (174) together with the bypass valve (172).

[0104] In addition, in this case, even if the retainer receiving groove (156) is formed deeply, the gap between the retainer seating surface (1561) and the back pressure chamber assembly (160) inside the retainer receiving groove (156) can be suppressed from becoming excessively wide. Through this, the gap between the bypass valve (172) and the retainer (173) can be minimized, and the thickness of the retainer (173) can be formed thinly, while effectively suppressing the closing delay of the bypass valve (172).

[0105] Meanwhile, a first sealing groove (155b) is formed on the inner and / or outer surface of the back pressure projection (155), and a first sealing member (1661) that is in sliding contact with a floating plate (165) to be described later can be inserted into the first sealing groove (155b). Accordingly, even if the floating plate (165) to be described later moves along the axial direction, the sealing effect on the inner wall surface of the back pressure chamber (160a) can be enhanced.

[0106] Referring to FIGS. 1 to 4, the back pressure chamber assembly (160) according to the present embodiment may be provided on the back surface of the non-orbiting scroll (150). In other words, the back pressure chamber assembly (160) may be provided between the non-orbiting scroll (150) and the high-low pressure separation plate (115). Accordingly, the back pressure of the back pressure chamber (160a) (more precisely, the force exerted by the back pressure on the back pressure chamber) is applied to the non-orbiting scroll (150). As a result, the non-orbiting scroll (150) is pressed in the direction toward the orbiting scroll (140) to come into close contact with the orbiting scroll (140), thereby sealing both compression chambers (V1) (V2).

[0107] Specifically, the back pressure chamber assembly (160) may be formed of a floating plate (165). In other words, the floating plate (165) forming the back pressure chamber assembly (160) may be slidably coupled to a back pressure projection (155) that protrudes as a single body from the back surface (151a) of the non-orbiting plate portion (151) to form a back pressure chamber (160a) together with the back pressure projection (155). Accordingly, since the back pressure chamber assembly (160) is formed of a single member, the number of parts for the back pressure chamber assembly (160) can be reduced, thereby lowering the manufacturing cost. In addition, since there is no need to fasten the back pressure chamber assembly (160) to the non-orbiting scroll (150), the assembly work is reduced, thereby further lowering the manufacturing cost.

[0108] The floating plate (165) is formed in an annular shape and may include an outer sealing portion (1651), an inner sealing portion (1652), and a connecting sealing portion (1653). The outer sealing portion (1651) may form the outer surface of the back pressure chamber (160a), the inner sealing portion (1652) may form the inner surface of the back pressure chamber (160a), and the connecting sealing portion (1653) may form the upper surface of the back pressure chamber (160a). Accordingly, the outer sealing portion (1651), the inner sealing portion (1652), and the connecting sealing portion (1653) may form the back pressure chamber (160a) together with the upper surface of the back pressure projection (155).

[0109] The outer sealing portion (1651) and the inner sealing portion (1652) are formed parallel to each other, and a plate support surface (165a) may be formed with a step between the outer sealing portion (1651) and the connecting sealing portion (1653) and between the inner sealing portion (1652) and the connecting sealing portion (1653), respectively. In other words, the length from the plate support surface (165a) to the end of the outer sealing portion (1651) may be formed to be smaller than the height of the outer circumference of the back pressure projection (155), and the length from the plate support surface (165a) to the end of the inner sealing portion (1652) may be formed to be smaller than the height of the inner circumference of the back pressure projection (155). Accordingly, even if both plate support surfaces (165a) are in close contact with the end surfaces of the back pressure projection (155), the end surfaces of the floating plate (165), that is, the end surfaces of each of the outer sealing portion (1651) and the inner sealing portion (1652), can be spaced apart from the back surface of the non-rotating plate portion (151). Through this, not only can the floating plate (165) be prevented from colliding with the back surface of the non-rotating plate portion (151), but also the intermediate discharge port (165c) described later can be spaced apart from the discharge port (1511) and / or the bypass hole (1512a)(1512b) by an appropriate distance, thereby reducing the discharge resistance of the refrigerant discharged from the compression chamber (V).

[0110] In this case, the two plate support surfaces (165a) are formed to overlap with the end surfaces of the back pressure projection (155) in the axial direction, respectively, and a back pressure space (165b) can be formed sunken between the two plate support surfaces (165a). Accordingly, even if the two plate support surfaces (165a) are in close contact with the end surfaces of the back pressure projection (155) during initial operation, the back pressure space (165b) can be spaced apart from the end surfaces of the back pressure projection (155) to form a back pressure chamber (160a).

[0111] In addition, in this case, a second sealing groove (1651a) is formed on the inner surface of the outer sealing portion (1651) so that a second sealing member (1662) can be inserted. Accordingly, the outer surface of the back pressure chamber (160a) can be tightly sealed during normal operation.

[0112] In addition, in this case, an intermediate discharge port (165c) may be formed axially through the inner circumference of the inner sealing portion (1652). The intermediate discharge port (165c) may be formed by penetrating between both ends of the inner sealing portion (1652), and a plurality of intermediate discharge ports (165c) may be formed spaced apart from each other along the circumferential direction. Accordingly, as described above, the lower end of the intermediate discharge port (165c) may be spaced apart from the discharge port (1511) and / or the bypass hole (1512a)(1512b), so that the discharge resistance of the refrigerant discharged from the compression chamber (V) may be reduced.

[0113] In addition, in this case, a valve guide part (165d) into which a discharge valve (171) to be described later is slidably inserted may be formed axially through the center of the intermediate discharge port (165c), that is, the center of the floating plate (165). For example, the inner diameter of the valve guide part (165d) may be formed to be larger than the outer diameter of the discharge valve (171), that is, the outer diameter of the discharge guide part (1711) of the discharge valve (171) to be described later. Accordingly, the discharge valve (171) can open and close the discharge port (1511) while sliding with respect to the floating plate (165). This simplifies the back pressure chamber assembly (160) while maintaining the stable behavior of the discharge valve (171).

[0114] Also, in this case, the floating plate (165) can be formed of a material lighter than the non-rotating scroll (150). Accordingly, the floating plate (165) can be attached to and detached from the lower surface of the high-low pressure separation plate (115) while quickly moving in the axial direction with respect to the back pressure projection (155) according to the pressure of the back pressure chamber (160a).

[0115] Fig. 5 is a perspective view showing the bypass valve and retainer separated from the non-orbiting scroll in Fig. 1, Fig. 6 is a plan view showing the bypass valve and retainer assembled to the non-orbiting scroll in Fig. 5, and Fig. 7 is a cross-sectional view taken along line "Ⅶ-Ⅶ" of Fig. 6.

[0116] Referring to FIGS. 5 to 7, the valve assembly (170) according to the present embodiment may be provided between the non-orbiting scroll (150) and the back pressure chamber assembly (160). For example, the valve assembly (170) may be inserted into the inner side of the back pressure projection (155) of the non-orbiting scroll (150), that is, into the retainer receiving groove (156), and fixed between the non-orbiting scroll (150) and the back pressure chamber assembly (160). Accordingly, the valve assembly (170) may be easily processed and / or assembled.

[0117] The valve assembly (170) may be described including the discharge valve (171) and the bypass valve (172), or may be described excluding the discharge valve (171) and including only the bypass valve (172). In the present embodiment, the discharge valve (171) is inserted so as to slide in the valve guide (165d) provided in the floating plate (165), while the bypass valve (172) is fixed to the non-rotating scroll (150) by a retainer (173) to be described later. In the present embodiment, the discharge valve (171) and the bypass valve (172) are described as being included in the valve assembly (170) together with the retainer (173) to be described later.

[0118] In addition, the valve assembly (170) can be inserted into the retainer receiving groove (156) of the non-rotating plate portion (151) described above and fixed between the non-rotating scroll (150) and the back pressure chamber assembly (160). In other words, the retainer receiving groove (156) is not included in the valve assembly (170), but since it is a portion into which the valve assembly (170) is inserted, broadly speaking, the retainer receiving groove (156) may also be included in the valve assembly (170). Hereinafter, the retainer receiving groove (156) will be described separately from the valve assembly (170), but a portion related to the valve assembly (170) may be described as a part of the valve assembly (170).

[0119] Specifically, the valve assembly (170) may include a discharge valve (171), a bypass valve (172), a retainer (173), and a retainer support member (174). The discharge valve (171) may be formed as a piston valve that opens and closes a discharge port (1511) while sliding axially along a valve guide (165d) of a floating plate (165) to be described later, and the bypass valve (172) may be formed as a reed valve that opens and closes a bypass hole (1512) while the opening and closing end rotates around a fixed end. The retainer (173) may be provided on the back surface of the bypass valve (172) to limit the opening amount of the bypass valve (172), and the retainer support member (174) may be provided on the back surface of the retainer (173) to axially support the retainer (173).

[0120] The discharge valve (171) according to the present embodiment may include a discharge guide portion (1711) and a discharge opening / closing portion (1712). The discharge guide portion (1711) is a portion that maintains straightness when the discharge valve (171) is opened / closed, and the discharge opening / closing portion (1712) is a portion that opens / closes the discharge port (1511). Accordingly, the discharge valve (171) forms a type of piston valve.

[0121] The discharge guide part (1711) can be extended in the axial direction and slidably inserted into the valve guide part (165d) of the floating plate (165). Accordingly, the discharge guide part (1711) can guide the discharge valve (171) to open and close stably by sliding along the valve guide part (165d) in the axial direction.

[0122] The discharge opening / closing portion (1712) may be expanded into a flange shape from one end of the discharge guide portion (1711). For example, the discharge opening / closing portion (1712) may be formed to be larger than the inner diameter of the discharge port (1511). Accordingly, the discharge port (1511) can be quickly opened / closed while minimizing the weight of the discharge valve (171).

[0123] The bypass valve (172) according to the present embodiment may include a plurality of fixed parts (1721a)(1722a), a plurality of elastic parts (1721b)(1722b), and a plurality of opening / closing parts (1721c)(1722c). The fixed parts (1721a)(1722a) are parts whereby the bypass valve (172) is fixed to the non-rotating scroll (150), the elastic parts (1721b)(1722b) are parts that guide the opening / closing parts (1721c)(1722c) to open / close elastically while bending around the fixed parts (1721a)(1722a), and the opening / closing parts (1721c)(1722c) are parts that open / close the bypass hole (1512a)(1512b). Accordingly, the bypass valve (172) forms a kind of reed valve.

[0124] For example, a plurality of fixed parts (1721a)(1722a) and a plurality of elastic parts (1721b)(1722b) may be connected to each other, and a plurality of elastic parts (1721b)(1722b) and a plurality of opening / closing parts (1721c)(1722c) may be connected to each other. Accordingly, the bypass valve (172) according to the present embodiment may be formed in an annular shape.

[0125] Specifically, the bypass valve (172) is composed of a first bypass valve (1721) that opens and closes the first bypass hole (1512a) and a second bypass valve (1722) that opens and closes the second bypass hole (1512b). However, the first bypass valve (1721) and the second bypass valve (1722) may be connected to each other and formed in an annular shape.

[0126] In other words, the first bypass valve (1721) may be formed of a first fixed portion (1721a), a first elastic portion (1721b), and a first opening / closing portion (1721c), and the second bypass valve (1722) may be formed of a second fixed portion (1722a), a second elastic portion (1722b), and a second opening / closing portion (1722c). The first elastic portion (1721b) may extend to both sides of the first fixed portion (1721a), the second elastic portion (1722b) may extend to both sides of the second fixed portion (1722a), and one first opening / closing portion (1721c) and one second opening / closing portion (1722c) may be connected between each of the first elastic portions (1721b) and the second elastic portion (1722b). Accordingly, the first bypass valve (1721) and the second bypass valve (1722) are connected to each other and formed as a single member, thereby facilitating the manufacturing and / or assembly of the bypass valve (172).

[0127] In addition, in this case, the cross-sectional areas of the first bypass valve (1721) and the second bypass valve (1722) can be minimized to secure the space between the intermediate discharge port (165c) and the valve assembly (170), that is, the area of ​​the discharge guide passage (F), as large as possible. Accordingly, the flow resistance to the refrigerant discharged through the discharge port (1511) and / or the bypass hole (1512a)(1512b) can be minimized.

[0128] In addition, in the bypass valve (172) according to the present embodiment, the first center line (CL1) connecting the center of the first fixing part (1721a) and the center of the second fixing part (1722a) and the second center line (CL2) connecting the center of the first opening / closing part (1721c) and the center of the second opening / closing part (1722c) may be formed to intersect each other, for example, to be perpendicular to each other. Accordingly, the bypass valve (172) may be formed symmetrically with respect to the first center line (CL1) and the second center line (CL2). Through this, the bypass valve (172) can be uniformly opened and closed by forming the first elastic portion (1721b) and the second elastic portion (1722b) to have the same length from the first fixed portion (1721a) and the second fixed portion (1722a) to the first opening and closing portion (1721c) and the second opening and closing portion (1722c), that is, the first elastic portion (1721b) and the second elastic portion (1722b).

[0129] In addition, a first fixing hole (1721d) may be formed axially through the first fixing part (1721a) according to the present embodiment, and a second fixing hole (1722d) may be formed axially through the second fixing part (1722a). The first fixing protrusion (1731a) and the second fixing protrusion (1732a) of the retainer (173) to be described later may be inserted into the first fixing hole (1721d) and the second fixing hole (1722d), respectively, so that the bypass valve (172) may be supported laterally. Accordingly, the bypass valve (172) may be stably fixed to the non-rotating scroll (150) by the retainer (173).

[0130] A retainer (173) according to the present embodiment may include a plurality of valve fixing parts (1731a)(1732a), a plurality of connecting support parts (1731b)(1732b), and a plurality of valve supporting parts (1731c)(1732c). The valve fixing parts (1731a)(1732a) are parts that fix the bypass valve (172) to the non-rotating scroll (150), the connecting support parts (1731b)(1732b) are parts that support the elastic part (1721b)(1722b) of the bypass valve (172), and the valve supporting parts (1731c)(1732c) are parts that support the opening / closing part (1721c)(1722c) of the bypass valve (172). Accordingly, the retainer (173) forms a kind of reed valve together with the bypass valve (172).

[0131] The retainer (173) can be formed in a shape almost identical to that of the bypass valve (172) described above. In other words, the retainer (173), like the bypass valve (172), can be formed in an annular shape by connecting the first retainer (1731) and the second retainer (1732) to each other. Accordingly, not only is the manufacturing and / or assembly of the retainer (173) easy, but the discharge guide passage (F) can also be secured widely.

[0132] Specifically, the retainer (173) is composed of a first retainer (1731) that supports the first bypass valve (1721) and a second retainer (1732) that supports the second bypass valve (1722), and the first retainer (1731) and the second retainer (1732) can be connected to each other to form an annular shape.

[0133] In other words, the first retainer (1731) is composed of a first valve fixing part (1731a), a first connection support part (1731b) and a first valve support part (1731c), and the second retainer (1732) is composed of a second valve fixing part (1732a), a second connection support part (1732b) and a second valve support part (1732c), wherein the first connection support parts (1731b) extend to both sides of the first valve fixing part (1731a), the second connection support parts (1732b) extend to both sides of the second valve fixing part (1732a), and between each of the first connection support parts (1731b) and the second connection support parts (1732b), one first valve support part (1731c) and The second valve support members (1732c) can be formed by being connected to each other. Accordingly, the first retainer (1731) and the second retainer (1732) can be connected to each other to form an annular shape as described above.

[0134] In this case, the retainer (173) according to the present embodiment may be formed so that, similar to the bypass valve (172), the third center line (CL3) connecting the center of the first valve fixing portion (1731a) and the center of the second valve fixing portion (1732a) and the fourth center line (CL4) connecting the center of the first valve support portion (1731c) and the center of the second valve support portion (1732c) intersect each other, for example, are perpendicular to each other. Accordingly, the retainer (173) may be formed symmetrically with respect to the third center line (CL3) formed on the same line as the first center line (CL1) and the fourth center line (CL4) formed on the same line as the second center line (CL2). Through this, the retainer (173) is formed so that the length from the first valve fixing portion (1731a) and the second valve fixing portion (1732a) to the first valve support portion (1731c) and the second valve support portion (1732c), in other words, the first connection support portion (1731b) and the second connection support portion (1732b) are formed to be the same, so that the first opening / closing portion (1721c) of the first bypass valve (1721) and the second opening / closing portion (1722c) of the second bypass valve (1722) can be opened / closed uniformly.

[0135] The first valve fixing portion (1731a) and the second valve fixing portion (1732a) are formed flat, but the first connection support portion (1731b) and the second connection support portion (1732b) and the first valve support portion (1731c) and the second valve support portion (1732c) can be formed to be curved in consideration of the opening operation of the first bypass valve (1721) and the second bypass valve (1722). For example, the first opening / closing portion (1721c) of the first bypass valve (1721) and the second opening / closing portion (1722c) of the second bypass valve (1722) are opened by being curved about the first fixing portion (1721a) and the second fixing portion (1722a), that is, in the direction toward the first center line (CL1). Accordingly, the first connection support portion (1731b) and the first valve support portion (1731c) of the first retainer (1731) and the second connection support portion (1732b) and the second valve support portion (1732c) of the second retainer (1732) can also be formed into a curved surface so as to be wound toward the third center line (CL3). Through this, the first opening / closing portion (1721c) of the first bypass valve (1721) and the second opening / closing portion (1722c) of the second bypass valve (1722) can be stably opened / closed, thereby improving the reliability of the bypass valve.

[0136] In addition, the first valve fixing part (1731a) according to the present embodiment may be formed with a first fixing projection (1731a) extending in the axial direction, and the second valve fixing part (1732a) may be formed with a second fixing projection (1732a). These first fixing projections (1731a) and second fixing projections (1732a) may penetrate the first fixing hole (1721d) of the first bypass valve (1721) and the second fixing hole (1722d) of the second bypass valve (1722), and may be inserted into the first retainer fixing groove (1561a) and the second retainer fixing groove (1561b) of the non-rotating scroll (150) described above, respectively. Accordingly, the retainer (173) can stably fix the bypass valve (172) to the non-rotating scroll (150).

[0137] Meanwhile, the retainer support member (174) according to the present embodiment may include a first support member (1741) and a second support member (1742). The first support member (1741) is a member that contacts the retainer (173) and supports the retainer (173), and the second support member (1742) is a member that is fixed between the first support member (1741) and the non-orbiting scroll and supports the first support member (1741). Accordingly, the bypass valve (172) including the retainer (173) can be easily and stably fixed to the non-orbiting scroll (150) by the retainer support member (1744).

[0138] The first support member (1741) is formed in an annular shape, and the outer diameter of the first support member (1741) may be formed smaller than the inner diameter of the back pressure projection (155), that is, the inner diameter of the retainer receiving surface (1562). Accordingly, the first support member (1741) can be inserted into the retainer receiving groove (156) to stably support the back surface of the retainer (173).

[0139] The second support member (1742) is formed as a C-ring and can be inserted into a retainer support groove (155a) provided on the inner surface of the back pressure projection (155). Accordingly, the second support member (1742) can stably support the bypass valve (172) including the retainer (173) by axially fixing the first support member (1741).

[0140] Although not shown in the drawing, the retainer support member (174) may be formed of a single member. For example, the retainer support member (174) may be formed of only one second support member (1742) described above and inserted into the retainer support groove (155a), may be fixed by being pressed into the back pressure projection (155), or may be fastened to the inner surface of the back pressure projection (155) by forming a hook or screw thread on the outer surface.

[0141] The scroll compressor according to the above embodiment operates as follows.

[0142] That is, when power is applied to the driving motor (120) and rotational force is generated, the orbiting scroll (140) eccentrically coupled to the rotation shaft (125) orbits the non-orbiting scroll (150) by the Oldham ring (139). At this time, a first compression chamber (V1) and a second compression chamber (V2) that move continuously can be formed between the orbiting scroll (140) and the non-orbiting scroll (150). The volume of the first compression chamber (V1) and the second compression chamber (V2) gradually narrows as they move from the suction port (or suction chamber) (1531) toward the discharge port (or discharge chamber) (1511) while the orbiting scroll (140) orbits.

[0143] Then, the refrigerant is sucked into the low pressure section (110a) of the casing (110) through the refrigerant suction pipe (117), and a portion of this refrigerant is directly sucked into each of the suction pressure chambers (not shown) forming the first compression chamber (V1) and the second compression chamber (V2) and compressed, while the remaining refrigerant moves toward the drive motor (120), cools the drive motor (120), and is sucked into the suction pressure chamber (not shown) together with other refrigerants.

[0144] Then, the refrigerant is compressed while moving along the movement path of the first compression chamber (V1) and the second compression chamber (V2), and a portion of the compressed refrigerant moves to the back pressure chamber (160a) formed by the non-rotating scroll (150) and the floating plate (165) through the first back pressure hole (1513) and the second back pressure hole (1611b) before reaching the discharge port (1511). Accordingly, the back pressure chamber (160a) forms an intermediate pressure.

[0145] Then, the floating plate (165) rises toward the high-low pressure separator (115) and comes into close contact with the high-low pressure separator (115). Accordingly, the high-pressure section (110b) of the casing (110) is separated from the low-pressure section (110a), thereby preventing the refrigerant discharged from each compression chamber (V1) (V2) to the high-pressure section (110b) from flowing back to the low-pressure section (110a).

[0146] On the other hand, the non-orbiting scroll (150) is lowered by pressure in the direction toward the orbiting scroll (140) due to the pressure of the back pressure chamber (160a). Accordingly, as the non-orbiting scroll (150) is pressed against the orbiting scroll (140), it is possible to prevent the refrigerant in both compression chambers from leaking from the high-pressure side compression chamber forming the intermediate pressure chamber to the low-pressure side compression chamber.

[0147] Then, the refrigerant moves from the intermediate pressure chamber toward the discharge pressure chamber and is compressed to the set pressure, and this refrigerant moves to the discharge port (1511) and pressurizes the discharge valve (171) in the opening direction. Then, the discharge valve (171) is pushed by the pressure of the discharge pressure chamber and rises along the valve guide (165d), and the discharge port (1511) opens. Then, the refrigerant in the discharge pressure chamber is discharged to the high pressure section (110b) through the discharge port (1511) and the intermediate discharge port (165c) provided in the floating plate (165).

[0148] Meanwhile, the pressure of the refrigerant may rise above the preset pressure due to various conditions occurring during the operation of the compressor. Then, a portion of the refrigerant moving from the intermediate pressure chamber to the discharge pressure chamber is bypassed in advance from the intermediate pressure chamber forming each compression chamber (V1) (V2) toward the high pressure section (110b) through the first bypass hole (1512a) and the second bypass hole (1512b) before reaching the discharge pressure chamber.

[0149] When the pressure of the first compression chamber (V1) and the pressure of the second compression chamber (V2) are each higher than the set pressure, the refrigerant compressed in the first compression chamber (V1) moves to the first bypass hole (1512a), and the refrigerant in the second compression chamber (V2) moves to the second bypass hole (1512b). Then, the refrigerant moving to these bypass holes (1512a)(1512b) pushes up the first bypass valve (1721) and the second bypass valve (1722), which block the first bypass hole (1512a) and the second bypass hole (1512b), respectively. Then, the first elastic part (1721b) of the first bypass valve (1721) and the second elastic part (1722b) of the second bypass valve (1722) are each bent around the first fixed part (1721a) and the second fixed part (1722a), and the first opening / closing part (1721c) of the first bypass valve (1721) is separated from the first bypass hole (1512a), and the second opening / closing part (1722c) of the second bypass valve (1722) is separated from the second bypass hole (1512b). Then, the first bypass hole (1512a) and the second bypass hole (1512b) are opened. At this time, the opening amount of the first bypass valve (1721) is limited by the first connection support (1731b) and the first valve support (1732c) of the retainer (173), and the opening amount of the second bypass valve (1722) is limited by the second connection support (1732b) and the second valve support (1732c) of the retainer (173).

[0150] Then, the refrigerant in the first compression chamber (V1) is discharged to the retainer receiving groove (156) through the first bypass hole (1512a), and the refrigerant in the second compression chamber (V2) is discharged to the retainer receiving groove (156) through the second bypass hole (1512b), and these refrigerants move to the discharge guide passage (F), which is the space between the retainer (173) and the retainer receiving groove (156). This refrigerant, together with the refrigerant discharged through the discharge port (1511), is discharged to the high pressure section (110b) through the intermediate discharge port (165c) of the floating plate (165). Accordingly, the refrigerant compressed in the compression chamber (V) is suppressed from being overcompressed beyond the set pressure, thereby suppressing damage to the orbiting wrap (142) and / or the non-orbiting wrap (152), and at the same time increasing the compressor efficiency.

[0151] Afterwards, when the overcompression of the compression chamber (V) is relieved and the pressure is restored to the appropriate level, the first bypass valve (1721) and the second bypass valve (1722) rotate around the first fixing portion (1721a) and unfold, respectively. Then, the first bypass valve (1721) and the second bypass valve (1722) repeat a series of processes in which they block the first bypass hole (1512a) and the second bypass valve (1722) respectively block the second bypass hole (1512b).

[0152] At this time, the high-pressure refrigerant that was not discharged is trapped in the first bypass hole (1512a) and the second bypass hole (1512b). Then, the pressure in the compression chamber (V) increases unnecessarily, and the first bypass hole (1512a) and the second bypass hole (1512b) form a kind of dead volume. Therefore, it is advantageous to form the thickness of the non-rotating plate part (151) provided with the first bypass hole (1512a) and the second bypass hole (1512b) as thin as possible to reduce the length (L2) of the first bypass hole (1512a) and the second bypass hole (1512b) and lower the dead volume.

[0153] However, in the case where the bypass valve (172) is connected to the non-rotating plate part (151) as in the past, a minimum connection thickness is required to connect the bypass valve (172), so there is a limit to reducing the thickness of the non-rotating plate part (151). Therefore, in the present embodiment, as described above, the floating plate (165) is slidably inserted into the back surface (151a) of the non-rotating plate part (151) so that the back pressure projection (155) forming the back pressure chamber is formed as a single body, thereby making it possible to form the thickness of the non-rotating plate part (151) as thin as possible. Accordingly, the length (L1) of the first bypass hole (1512a) and the length (L2) of the second bypass hole (1512b) can be minimized, thereby minimizing the dead volume in the first bypass hole (1512a) and the second bypass hole (1512b). Through this, the amount of refrigerant remaining in the first bypass hole (1512a) and the second bypass hole (1512b) can be minimized, thereby increasing the compression efficiency.

[0154] In addition, in this embodiment, since the retainer receiving groove (156) formed by the back pressure projection (155) is formed in a circular shape, the non-rotating scroll (150) including the retainer receiving groove (156) can be easily processed.

[0155] In addition, in this embodiment, since the bypass valve (172) and the retainer (173) are each formed in an annular shape, processing and assembly of the bypass valve (172) and the retainer (173) are easy, and the bypass valve (172) and the retainer (173) can be stably fixed.

[0156] In addition, in this embodiment, the bypass valve (172) and the retainer (173) are each formed in an annular shape and symmetrically formed around their respective center lines, so that the first bypass valve (1721) and the second bypass valve (1722) can be opened and closed quickly and uniformly.

[0157] In addition, in this embodiment, since the first bypass opening / closing part (1722) and the second bypass valve (1722) of the bypass valve (172) are formed in a shape that spreads apart as they get farther away from the first fixing part (1721a) and the second fixing part (1722a), the lengths of the first bypass valve (1721) and the second bypass valve (1722) can be formed as long as possible. Through this, the retainer receiving groove (156) can be formed in a circular shape, while the bypass valve (172) can be smoothly opened and closed, effectively suppressing overcompression caused by the bypass valve (172).

[0158] Although not shown in the drawing, one of the bypass valve (172) and the retainer (173) may be formed in an annular shape as described above, while the other may be formed in an arcuate shape and / or a rectangular shape having both ends. For example, the bypass valve (172) may be formed in an annular shape in which the first bypass valve (1721) and the second bypass valve (1722) are connected to each other as described above, while the retainer (173) may be formed in an arcuate shape in which the first retainer (1731) and the second retainer (1732) are connected at one end and separated at the other end, or may be formed in a plurality of rectangular shapes in which the retainers (1731) and (1732) are separated from each other. Alternatively, the bypass valve (172) may be separated and the retainer (173) may be formed integrally. In these cases, the position and / or shape of the bypass hole (1512a)(1512b) can be appropriately varied.

[0159] Meanwhile, there are other embodiments of the back pressure chamber assembly as follows.

[0160] That is, in the above-described embodiment, a back pressure projection is formed on the back surface of the non-orbiting scroll and a floating plate is slidably inserted into the back pressure projection to form a back pressure chamber. However, in some cases, a back pressure plate may be fastened to the back surface of the non-orbiting scroll and a floating plate may be slidably inserted into the back pressure plate to form a back pressure chamber.

[0161] Fig. 8 is a longitudinal cross-sectional view showing another embodiment of a back pressure chamber assembly, Fig. 9 is a perspective view showing a part of the non-orbiting scroll and back pressure chamber assembly in Fig. 8 disassembled from below, and Fig. 10 is a cross-sectional view showing the non-orbiting scroll and back pressure chamber assembly in Fig. 8 assembled.

[0162] Referring to FIGS. 8 to 10, the basic configuration and the resulting operational effects of the scroll compressor according to the present embodiment are similar to those of the above-described embodiment. For example, the interior of the casing (110) may be separated into a low-pressure section (110a) and a high-pressure section (110b) by a high-low-pressure separation plate (115), and the low-pressure section (110a) may be provided with a driving motor (120) and a compression section (not shown). The compression section may include an orbiting scroll (140) provided between the main frame (130) and the non-orbiting scroll (150), and a back-pressure chamber assembly (160) forming a back-pressure chamber (160a) may be provided on the back side of the non-orbiting scroll (150). Accordingly, the non-orbiting scroll (150) is pressed toward the orbiting scroll (140) by the back pressure of the back pressure chamber (160a) and is brought into close contact, thereby preventing leakage between the compression chambers (V1) and (V2).

[0163] In addition, a discharge valve (171) for opening and closing a discharge port (1511) and a bypass valve (172) for opening and closing a bypass hole (1512a) (1512b) are respectively provided on the back surface of the non-rotating scroll (150), so that the discharge port (1511) and / or the bypass hole (1512a) (1512b) can be opened and closed depending on the pressure of the compression chamber (V). Accordingly, a portion of the refrigerant compressed in the compression chamber (V) can be selectively bypassed depending on the operating state of the compressor and the refrigeration cycle device including the compressor, thereby suppressing overcompression.

[0164] However, in the present embodiment, a back pressure plate (161) forming part of a back pressure chamber assembly (160) is fastened to a non-rotating scroll (150), and a floating plate (165) forming a back pressure chamber (160a) together with the back pressure plate (161) can be slidably inserted into the back pressure plate (161).

[0165] In this case, a retainer receiving groove (156) is formed by being sunken to a preset depth in the back surface (151a) of the non-rotating plate portion (151), and a discharge valve (171) and a bypass valve (172) can be received in the retainer receiving groove (156) together with a retainer (173). Accordingly, while securing a fastening thickness for fastening the back pressure plate (161) to the non-rotating scroll (150), the length of the discharge port (1511) and / or the length of the bypass hole (1512a)(1512b) can be formed as short as possible, thereby suppressing the dead volume in the discharge port (1511) and / or the bypass hole (1512a)(1512b).

[0166] In this case, the discharge port (1511) and the bypass hole (1512) may be formed inside the retainer receiving groove (156). In other words, the retainer receiving groove (156) is formed by a retainer seating surface (1561) forming the bottom surface and a retainer receiving surface (1562) forming the inner surface (side wall surface) of the retainer receiving groove (156) and surrounding the retainer seating surface (1561), and the discharge port (1511) and the bypass hole (1512a) (1512b) may be formed to penetrate the retainer seating surface (1561) and communicate with the compression chamber (V1) (V2). Accordingly, the length (L1) of the discharge port (1511) and the length (L2) of the bypass hole (1512) are shortened by the depth (D2) of the retainer receiving groove (156), so that the length (L1) of the discharge port (1511) and the length (L2) of the bypass hole (1512) are shortened. Through this, the dead volume in the discharge port (1511) and / or the bypass hole (1512) can be reduced.

[0167] The back pressure plate (161) according to the present embodiment may include a fixed plate portion (1611), an outer annular wall portion (1612), and an inner annular wall portion (1613). The fixed plate portion (1611) is a portion that is fastened to the non-orbiting scroll (150), and the outer annular wall portion (1612) and the inner annular wall portion (1613) are portions into which the floating plate (165) is slidably inserted.

[0168] The fixed plate (1611) is formed in the shape of a circular plate with a hollow center, and a plurality of pressure-reducing fastening holes (1611a) can be formed along the edges. Accordingly, the fixed plate (1611) can be bolt-fastened to the fastening groove (151b) of the non-rotating scroll (150)d by a pressure-reducing fastening bolt (177) passing through the pressure-reducing fastening hole (1611a).

[0169] In this case, the first back pressure hole (1513) may be formed in the non-orbiting plate portion (151) and the second back pressure hole (1611b) may be formed in the fixed plate portion (1611) so as to be in communication with each other on the same axis. Accordingly, the compression chamber (V) and the back pressure chamber (160a) may be in communication with each other through the first back pressure hole (1513) of the non-orbiting scroll (150) and the second back pressure hole (1611b) of the back pressure chamber assembly (160). In this case as well, the first back pressure hole (1513) and / or the second back pressure hole (1611b) may be provided with a back pressure control valve (not shown) that opens and closes the first back pressure hole (1513) and / or the second back pressure hole (1611b).

[0170] The outer annular wall portion (1612) can be formed in an annular shape to surround the outer surface of the fixed plate portion (1611) on one side of the fixed plate portion (1611). Accordingly, the outer annular wall portion (1613) forms the outer wall surface of the pressure relief chamber (160a).

[0171] The inner annular wall portion (1613) can be formed in an annular shape to surround the inner surface of the fixed plate portion (1611) on one side of the fixed plate portion (1611) facing the high-low pressure separation plate (115). Accordingly, the inner annular wall portion (1613) forms the inner wall surface of the pressure relief chamber (160a).

[0172] In addition, an intermediate discharge port (1612a) communicating with the discharge port (1511) of the non-orbiting scroll (150) may be formed on the inner annular wall portion (1613), and a valve guide portion (1613b) into which a discharge valve (171) is slidably inserted may be formed on the inside of the intermediate discharge port (1613a). Accordingly, the discharge valve (171) may be slidably coupled to the back pressure plate (161) fixed to the non-orbiting scroll (150), thereby improving the operational stability of the discharge valve (171).

[0173] The floating plate (165) according to the present embodiment is formed in an annular shape and can be slidably inserted into the inner surface of the outer annular wall portion (1612) and the outer surface of the inner annular wall portion (1613), respectively. Accordingly, the floating plate (165) moves rapidly in the axial direction with respect to the back pressure plate (161) according to the pressure of the back pressure chamber (160a) and is attached to and detached from the lower surface of the high-low pressure separation plate (115).

[0174] In the case where the back pressure chamber assembly (160) is composed of a back pressure plate (161) that is fastened to the back surface of the non-rotating scroll (150) as described above and a floating plate (165) that is slidably coupled to the back pressure plate (161), the floating plate (165) can be further simplified and operate quickly to quickly separate the low pressure portion (110a) and the high pressure portion (110b) of the casing (110).

[0175] In addition, in this case, as described above, the discharge valve (171) is slidably inserted into the back pressure plate (161) that is connected to the non-rotating scroll (150), so that the behavior of the discharge valve (171) becomes more stable, thereby improving the compression efficiency.

[0176] Meanwhile, the valve assembly (170) according to the present embodiment may be formed identically or almost identically to the valve assembly (170) in the aforementioned embodiment. For example, the discharge valve (171) may be formed as a piston valve, and the bypass valve (172) may be formed as a reed valve.

[0177] However, the discharge valve (171) according to the present embodiment is slidably coupled to the valve guide (1612b) provided on the back pressure plate (161) as described above, and the bypass valve (172) is axially supported by the retainer (173) while being inserted into the retainer receiving groove (156) of the non-rotating scroll (150), and the retainer (173) can be axially supported by the retainer support member (174) together with the bypass valve (172).

[0178] In this case, the bypass valve (172) may be formed in an annular shape in which the first bypass valve (1721) and the second bypass valve (1722) are connected to each other, and the retainer (173) may be formed in an annular shape in which the first retainer (1731) and the second retainer (1732) are connected to each other. Since the configuration and the resulting operational effects of the bypass valve (172), retainer (173), and retainer support member (174) are the same as those of the above-described embodiment, the description thereof will be replaced with the description of the above-described embodiment.

[0179] Although not shown in the drawing, the first bypass valve (1721) and the second bypass valve (1722) may be fastened to the pressure relief assembly (160) together with the retainer (173). In this case, a first fastening member receiving groove (not shown) and a second fastening member receiving groove (not shown) may be formed on the retainer mounting surface (1561) to receive the head of the first valve fastening member (not shown) and the head of the second valve fastening member (not shown) that fasten the first bypass valve (1721) and the second bypass valve (1722) to the retainer (173), respectively. Accordingly, the lower surface of the retainer (173) can be closely adhered to the retainer mounting surface (1561), which is the bottom surface of the retainer receiving groove portion (156), and thus be firmly supported.

Claims

1. Casing; A rotary scroll that is coupled to a rotating shaft in the internal space of the above casing and performs a rotary motion; and It includes a non-orbiting scroll that is interlocked with the above-mentioned orbiting scroll to form a compression chamber and has a discharge port and a bypass hole formed to discharge the refrigerant in the compression chamber. A retainer insertion groove is formed on the back surface of the above non-rotating scroll to accommodate the discharge port and the bypass hole and is sunken to a preset depth, and a bypass valve for opening and closing the bypass hole and a retainer for limiting the opening amount of the bypass valve are inserted into the retainer insertion groove. A scroll compressor in which at least one of the above bypass valve and the above retainer is formed in an annular shape.

2. In paragraph 1, The above bypass holes are provided in multiple numbers and are formed around the discharge port, respectively. The above bypass valve, A plurality of fixed members fixed to the non-rotating scroll by the retainer; A plurality of elastic members extending in a circumferential direction from the plurality of fixed members; and A scroll compressor comprising a plurality of valve sections that open and close the bypass hole by connecting the plurality of elastic sections facing each other.

3. In paragraph 2, The first center line connecting the centers of the plurality of fixed parts and the second center line connecting the centers of the plurality of valve parts are formed to intersect each other, The above bypass valve, A scroll compressor formed symmetrically with respect to the first center line and the second center line.

4. In paragraph 2, The above retainer is, A plurality of valve fixing parts each fixing the plurality of fixing parts to the non-rotating scroll; A plurality of connecting support parts extending in the circumferential direction from the above plurality of valve fixing parts and spaced apart from the non-rotating scroll; and A scroll compressor including a plurality of valve supports that are spaced apart from the non-rotating scroll by connecting the plurality of connecting supports facing each other and limiting the opening amount of the plurality of valve parts.

5. In paragraph 4, The third center line connecting the centers of the plurality of valve fixing parts and the fourth center line connecting the centers of the plurality of valve supports are formed to intersect each other, The above retainer is, A scroll compressor formed symmetrically with respect to the third center line and the fourth center line.

6. In paragraph 5, The above plurality of connecting supports and the above plurality of valve supports are, A scroll compressor formed into a curved surface so as to be wound in the direction toward the third center line.

7. In paragraph 4, The above bypass valve has a fixing hole formed in each of the plurality of fixing parts, The above retainer is a scroll compressor in which a fixing projection inserted into a fixing hole of the above bypass valve is formed on each of the plurality of valve fixing parts.

8. In paragraph 7, A fixing groove is formed in the above non-rotating scroll so that the fixing projection of the retainer is inserted, A scroll compressor in which the depth of the above-mentioned fixed groove is formed smaller than the length of the above-mentioned bypass hole.

9. In paragraph 1, A scroll compressor in which a support member for supporting the retainer is provided on the inner surface of the retainer insertion groove.

10. In paragraph 9, The above support member is, A first support member formed in a circular shape and slidably inserted into the inner surface of the retainer insertion groove; and A scroll compressor including a second support member provided on the opposite side of the retainer based on the first support member and fixed to the inner surface of the retainer insertion groove.

11. In any one of paragraphs 1 to 10, On the back surface of the above non-orbiting scroll, a back pressure projection is formed that extends as a single body toward a back pressure chamber assembly that pressurizes the non-orbiting scroll toward the above-mentioned orbiting scroll and has the retainer insertion groove provided on its inner surface, and a back pressure hole communicating with the compression chamber is formed by penetrating through an end surface of the back pressure projection. The above pressure chamber assembly is, A scroll compressor comprising a floating plate that is slidably inserted into the above-mentioned back pressure projection and forms a back pressure chamber together with the end surface of the above-mentioned back pressure projection.

12. In paragraph 11, The above floating plate is, An outer sealing portion that is slidably inserted into the outer surface of the above-mentioned back pressure protrusion; An inner sealing portion that is slidably inserted into the inner surface of the above-mentioned back pressure protrusion; and Including a connecting sealing part connecting the outer sealing part and the inner sealing part, A scroll compressor in which a back pressure space is formed sunken on one side of the connecting sealing portion facing the back pressure projection.

13. In paragraph 12, An intermediate discharge port communicating with the discharge port is formed on the inner circumference of the inner sealing portion. A scroll compressor in which a valve guide part is formed on the inner side of the above intermediate discharge port, into which a discharge valve for opening and closing the above discharge port is slidably inserted.

14. In any one of paragraphs 1 to 10, The above non-orbiting scroll is coupled with a back pressure chamber assembly that pressurizes the non-orbiting scroll toward the orbiting scroll. The above pressure chamber assembly is, A back pressure plate coupled to the back surface of the non-rotating scroll at the outer edge of the retainer insertion groove and having a back pressure hole formed therein that is connected to the compression chamber; and A scroll compressor comprising a floating plate that is slidably inserted into the backing plate and forms a backing chamber between the backing plate and the backing plate.

15. In paragraph 14, The above pressure plate has an intermediate discharge port formed therein that is connected to the discharge port, A scroll compressor in which a valve receiving portion is formed on the inner side of the above intermediate discharge port into which a discharge valve for opening and closing the above discharge port is slidably inserted.

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