Scroll assembly and scroll compressor

Abstract

The utility model relates to a scroll assembly and scroll compressor, the scroll assembly comprises a scroll plate and a pressure control valve, the scroll plate comprises a scroll end plate, a scroll blade formed on a first side of the scroll end plate and a hub part formed on a second side opposite to the first side of the scroll end plate, the hub part defines a hub part cavity, and the pressure control valve is arranged in the hub part cavity. The scroll end plate includes a central exhaust hole formed at a center of the scroll end plate and a bypass hole formed radially outward of the central exhaust hole, and wherein the pressure control valve is provided in the hub cavity and is for opening and closing the bypass hole, a first seal portion is provided between a radially outer peripheral surface of the pressure control valve and a radially inner peripheral surface of the hub portion. The vortex assembly not only can prevent performance reduction of the compressor caused by recharge of high-pressure gas, but also is simple in structure and easy to machine and install.

Description

Technical Field

[0001] The present utility model relates to a scroll assembly and a scroll compressor. More specifically, the present utility model relates to a scroll assembly and a scroll compressor including a pressure control valve. Background Art

[0002] The content of this part only provides background information related to the present utility model, which may not constitute prior art.

[0003] Compressors may be applied in application systems that require different pressures, such as air conditioning systems, cold storage systems, cryogenic refrigeration systems, etc. Therefore, it may occur that the discharge pressure of the compression chamber (the maximum pressure in the compression chamber) is greater than the pressure required by a specific application system, that is, over-compression may occur, resulting in a decrease in system efficiency.

[0004] In order to reduce or prevent over-compression of the working fluid, devices capable of dynamically adjusting the compression ratio have been developed, such as a pressure control valve provided near the exhaust port of the compression mechanism of the compressor for discharging the working fluid that has not undergone complete compression by the compression mechanism and has reached the exhaust pressure. However, during the operation of the pressure control valve, high-pressure fluid may leak through the gaps between the various parts of the pressure control valve or the gaps between the pressure control valve and other components of the compressor, thereby resulting in a decrease in the performance of the compressor.

[0005] Therefore, there is a need for improvement in the structure and installation of compressors, especially pressure control valves, so as to solve the problem of leakage of high-pressure fluid at the pressure control valve. Summary of the Utility Model

[0006] One object of the present utility model is to provide a scroll assembly and a scroll compressor including the scroll assembly, wherein the scroll assembly includes a pressure control valve, which can not only allow the working fluid that has not undergone complete compression to reach the exhaust pressure to be bypassed to the high-pressure area of the compressor, but also effectively avoid the leakage of the working fluid through the gaps between the various parts of the pressure control valve or the gaps between the pressure control valve and other parts of the scroll assembly, thereby improving the performance of the compressor.

[0007] Another object of the present utility model is to provide a scroll assembly and a scroll compressor including the scroll assembly, the scroll assembly having a simple structure, being easy to process, install and maintain.

[0008] Still another object of the present utility model is to provide a scroll assembly and a scroll compressor including the scroll assembly, the scroll assembly including a bypass hole and a pressure control valve, wherein the bypass hole can communicate with an intermediate compression chamber with a lower pressure, so as to obtain a larger compression ratio adjustment range.

[0009] According to one aspect of the present utility model, a scroll assembly is provided. The scroll assembly includes a scroll disk and a pressure control valve. The scroll disk includes a scroll end plate, scroll vanes formed on a first side of the scroll end plate, and a hub portion formed on a second side of the scroll end plate opposite to the first side. The hub portion defines a hub cavity. The scroll end plate includes a central exhaust hole formed at the center of the scroll end plate and a bypass hole formed radially outside the central exhaust hole. Wherein, the pressure control valve is disposed in the hub cavity and is configured to open and close the bypass hole. A first sealing portion is provided between the radially outer peripheral surface of the pressure control valve and the radially inner peripheral surface of the hub portion.

[0010] Optionally, the pressure control valve includes a bottom surface disposed opposite to the second side surface of the scroll end plate. The bottom surface includes a first bottom surface region and a second bottom surface region located radially inside and radially outside the bypass hole respectively. A second sealing portion is provided between the first bottom surface and the second side surface of the scroll end plate.

[0011] Optionally, there is no seal between the second bottom surface region and the second side surface of the scroll end plate.

[0012] Optionally, the scroll disk further includes an inner peripheral wall portion formed on the second side of the scroll end plate around the central exhaust hole. A second sealing portion is provided between the radially inner peripheral surface of the pressure control valve and the radially outer peripheral surface of the inner peripheral wall portion.

[0013] Optionally, the bypass hole is configured as a straight hole, or the bypass hole is configured as a staggered hole in which one section in the axial direction is radially offset outward compared to another section.

[0014] Optionally, the opening of the bypass hole formed on the second side surface of the scroll end plate is adjacent to the hub portion.

[0015] Optionally, the pressure control valve includes a valve plate, a valve piece, and a valve stopper. The first sealing portion is provided between the radially outer peripheral surface of the valve plate and the radially inner peripheral surface of the hub portion, or the first sealing portion is provided between the radially outer peripheral surface of the valve stopper and the radially inner peripheral surface of the hub portion.

[0016] Optionally, the first sealing portion is provided between the radially outer peripheral surface of the valve stopper and the radially inner peripheral surface of the hub portion, and a third sealing portion is provided between the valve plate and the valve stopper.

[0017] Optionally, the pressure control valve includes a valve plate, a valve piece, and a valve stopper. The valve plate is formed with a valve hole for communicating with the bypass hole. The valve plate forms a recess on a side disposed opposite to the second side surface of the scroll end plate. The valve hole is located in the area defined by the recess, and the radially outer end of the recess is flush with the radially outer end of the valve plate.

[0018] Optionally, the valve plate further includes a central opening formed at the center of the valve plate for communicating with the central exhaust hole, and the recess extends radially inward from the radially outer end of the valve plate to a position between the central opening and the valve hole.

[0019] Optionally, the first sealing portion includes a sealing groove formed on at least one of the radially outer peripheral surface of the pressure control valve and the radially inner peripheral surface of the hub portion, and a seal installed in the sealing groove.

[0020] According to another aspect of the present invention, there is provided a scroll compressor, wherein the scroll compressor includes the scroll assembly described above.

[0021] Generally, the scroll assembly and the scroll compressor according to the present invention at least bring one of the following beneficial effects: the scroll assembly can effectively prevent the working fluid from leaking through the gaps between the various parts of the pressure control valve or the gaps between the pressure control valve and other parts of the scroll assembly, thereby avoiding the backflow of the high-pressure working fluid and improving the performance of the compressor; in addition, the bypass hole and the pressure control valve structure of the scroll assembly are simple, easy to process, and easy to install and maintain; in addition, the scroll assembly can provide a larger pressure ratio adjustment range, thereby more effectively improving the system efficiency. Description of the Drawings

[0022] Through the following description with reference to the drawings, the features and advantages of one or more embodiments of the present invention will become more readily understood. The drawings provided herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. The drawings are not drawn to scale, but some features may be enlarged or reduced to show details of specific components. In the drawings:

[0023] Figure 1 is a longitudinal sectional view of a scroll assembly of a scroll compressor according to a first embodiment of the present invention, wherein the scroll assembly includes a scroll plate and a pressure control valve;

[0024] Figure 2 is a perspective view of the valve plate of the pressure control valve according to the first embodiment of the present invention as viewed from above;

[0025] Figure 3 is a perspective view of the valve plate of the pressure control valve according to the first embodiment of the present invention as viewed from below;

[0026] Figure 4 is a longitudinal sectional view of the valve plate of the pressure control valve according to the first embodiment of the present invention;

[0027] Figure 5 is a perspective view of the valve plate of the pressure control valve according to the second embodiment of the present invention as viewed from below;

[0028] Figure 6 is a longitudinal sectional view of a valve plate of a pressure control valve according to a second embodiment of the present invention;

[0029] Figure 7 is a longitudinal sectional view of a scroll assembly of a scroll compressor according to a first modification of a first embodiment of the present invention;

[0030] Figure 8 is a longitudinal sectional view of a scroll assembly of a scroll compressor according to a second modification of a first embodiment of the present invention;

[0031] Figure 9 is a bottom view of a scroll plate of a scroll assembly according to a second modification of a first embodiment of the present invention;

[0032] Figure 10 is a longitudinal sectional view of a scroll assembly of a scroll compressor according to a third embodiment of the present invention;

[0033] Figure 11 is a longitudinal sectional view of a scroll assembly of a scroll compressor according to a fourth embodiment of the present invention;

[0034] Figure 12 is a longitudinal sectional view of a scroll assembly of a scroll compressor of a comparative example; and

[0035] Figure 13 is a perspective view of a valve plate of a pressure control valve of a comparative example as viewed from below. Detailed Embodiments

[0036] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. This description is merely exemplary and does not constitute a limitation on the present invention and its applications.

[0037] Generally, a scroll compressor includes a housing (not shown), a compression mechanism, a motor (not shown), a drive shaft (not shown), etc. The internal space of the housing can be divided into a high-pressure area and a low-pressure area. The compression mechanism includes a movable scroll plate and a fixed scroll plate. The motor is configured to rotate the drive shaft, and the drive shaft drives the movable scroll plate to perform an orbiting motion relative to the fixed scroll plate (i.e., the central axis of the movable scroll moves around the central axis of the fixed scroll, but the movable scroll does not rotate around its central axis) to compress the working fluid.

[0038] In the present invention, a component mainly composed of a scroll plate and a pressure control valve is referred to as a scroll assembly. Figure 1Shown is a scroll assembly 100 for a scroll compressor according to a first embodiment of the present utility model. The scroll assembly 100 includes a scroll plate 10 (stationary scroll plate) and a pressure control valve 130. In particular, herein, the stationary scroll plate is taken as an example to describe and illustrate the scroll assembly. However, it can be understood that the scroll plate for constituting the scroll assembly can also be a moving scroll plate.

[0039] As Figure 1 shown, the scroll plate 10 (stationary scroll plate) includes a scroll end plate 12 (stationary scroll end plate), a spiral scroll blade 14 (stationary scroll blade) formed on a first side of the scroll end plate, and a hub portion 16 formed on a second side of the scroll end plate 12 opposite to the first side. In addition, the scroll plate 10 may further include an outer peripheral wall portion 13 formed on the first side of the scroll end plate around the scroll blade 14. The scroll end plate 10 includes a central exhaust hole 18 formed at a substantially central portion of the scroll end plate 10. The moving scroll plate (not shown in the figure) may include a moving scroll end plate and a spiral moving scroll blade formed on one side of the moving scroll end plate. The stationary scroll blade and the moving scroll blade can engage with each other, so that a series of fluid chambers (such as an intake chamber, a central compression chamber, and an intermediate compression chamber) are formed between the stationary scroll blade and the moving scroll blade when the scroll compressor operates, thereby realizing the compression of the working fluid. Specifically, the pressure in the outermost radial intake chamber communicating with the intake port of the compression mechanism in the fluid chambers is the lowest, the pressure in the innermost radial fluid chamber, that is, the central compression chamber located at the central position of the scroll, is the highest, and the multiple intermediate compression chambers located between the intake chamber and the central compression chamber have an intermediate pressure between the maximum pressure and the minimum pressure. The working fluid can enter the series of fluid chambers from the intake port of the compression mechanism and be discharged from the central compression chamber through the central exhaust hole 18 after compression.

[0040] To achieve the compression of the fluid, effective sealing is required between the stationary scroll plate and the moving scroll plate. As Figure 1 shown, the scroll plate 10 may further include an annular wall 15 formed on the second side of the scroll end plate 12 around the hub portion 16, thereby forming a back pressure chamber between the annular wall 15 and the hub portion 16. The back pressure chamber is in fluid communication with one of the intermediate compression chambers in the compression chamber through an axially extending through hole formed in the scroll end plate 12, thereby providing an axial sealing pressure to the scroll plate 10.

[0041] To avoid the fluid pressure discharged through the central compression chamber and the central exhaust hole 18 being greater than the system required pressure, that is, to avoid over-compression, the scroll end plate 12 further includes a bypass hole 17 formed radially outside the central exhaust hole 18. See Figure 1, the central exhaust hole 18 penetrates through the scroll end plate 12 and forms openings on the first side surface (the surface of the scroll end plate 12 located on the first side) and the second side surface (the surface of the scroll end plate 12 located on the second side) of the scroll end plate 12 respectively. The bypass hole 17 penetrates through the scroll end plate 12 and forms openings on the first side surface and the second side surface of the scroll end plate 12 respectively. The hub 16 defines a hub cavity A, and the hub cavity A can communicate with the high-pressure area of the compressor. The openings formed by the central exhaust hole 18 and the bypass hole 17 on the second side surface of the scroll end plate 12 are both located in the hub cavity A. Thus, the central compression chamber can communicate with the hub cavity A via the central exhaust hole 18, and at least one intermediate compression chamber can communicate with the hub cavity A via the bypass hole 17. Thus, the working fluid in the intermediate compression chamber that has not been compressed into the central compression chamber can be discharged in advance via the bypass hole 17 when needed, so as to reduce the pressure of the fluid discharged by the scroll compressor and achieve the adjustment of the compression ratio. The bypass hole 17 may include two groups of holes arranged on the radial two sides of the central exhaust hole 18 respectively, and each group of holes may include a single hole or multiple holes distributed along the profile line (for example, as Figure 9 shown).

[0042] The opening and closing of the bypass hole 17 are realized by the pressure control valve 130. As Figure 1 shown, due to the setting of the back pressure chamber, the pressure control valve 130 is generally suitable for being installed in the hub cavity A. The following combines Figure 2 , Figure 3 and Figure 4 to describe the specific structure, position and working process of the pressure control valve 130 according to the first embodiment of the present invention.

[0043] The pressure control valve 130 can be constructed to be substantially annular, and a through hole for communicating with the central exhaust hole 18 is formed at its substantially central position, so that the working fluid from the central exhaust hole 18 can be discharged to the high-pressure area of the compressor. The pressure control valve 130 includes a valve plate 160, a valve piece 150 and a valve stop 140. As Figure 2 and Figure 3As shown, the valve plate 160 can be configured to be generally annular. The valve plate 160 includes a central opening 162 formed at its center and valve holes 164 formed on both sides of the central opening 162. The central opening 162 can be configured to be generally circular for substantially aligning and communicating with an opening formed on the second side surface of the scroll end plate 12 for the central exhaust hole 18. Each valve hole 164 can be configured to be oblong for communicating with an opening formed on the second side surface of the scroll end plate 12 for the corresponding side bypass hole 17. In addition, the valve plate 160 further includes mounting holes 168 formed between the valve holes 164 on both sides. The valve stopper 140 and the valve piece 150 can also be formed with mounting holes at positions corresponding to the mounting holes 168. Fasteners (such as bolts, not shown in the figure) can sequentially pass through the mounting holes on the valve stopper 140, the valve piece 150, and the valve plate 160 to fix the pressure control valve 130 to the scroll end plate 12.

[0044] Specifically, referring to Figure 4 , a generally annular sealing groove 166 is formed on the radially outer peripheral surface of the valve plate 160 and is arranged around the outer periphery of the valve plate. The sealing groove 166 opens towards the radially outer side of the valve plate 160, and a seal 170 can be installed in the sealing groove 166. Thus, when the pressure control valve 130 is installed in place in the hub space A, the sealing groove 166 and the seal 170 together constitute a first sealing portion S1 provided between the radially outer peripheral surface of the valve plate 160 and the radially inner peripheral surface of the hub 16. Those skilled in the art can understand that alternatively, a sealing groove can also be formed on the radially inner peripheral surface of the hub 16 or sealing half-grooves can be respectively formed on both the radially inner peripheral surface of the hub 16 and the radially outer peripheral surface of the valve plate 160, and seals can be correspondingly provided to constitute the first sealing portion S1. Preferably, the seal 170 is configured as an O-ring to reduce production and installation costs and improve reliability. However, those skilled in the art can understand that the first sealing portion S1 is not limited to being constituted by a sealing groove and an O-ring and can also be formed in other forms such as a metal-metal seal.

[0045] The valve plate 160 includes a bottom surface 163 (shown in Figure 3 ) arranged opposite to the second side surface of the scroll end plate 12 and a top surface opposite to the bottom surface 163 (shown in Figure 2 ). That is, when the valve plate 160 is installed in place in the hub space A, the bottom surface 163 faces the second side surface of the scroll end plate 12 (for example, in Figure 1 , the bottom surface 163 of the valve plate 160 is shown as the lower surface). Referring to Figure 2 and Figure 3 , the top surface 161 is configured to be a generally flat surface, and the valve piece 150 can cover the top surface 161 to close the valve holes 164. The bottom surface 163 is configured to be a generally flat surface for abutting against the second side surface of the scroll end plate 12.

[0046] Preferably, a recess 165 is formed on one side of the valve plate 160 where it is arranged to face the second side surface of the scroll end plate 12. The valve hole 164 is located in the area defined by the recess 165, and the radially outer end of the recess 165 is flush with the radially outer end of the valve plate 160. In other words, the recess 165 can be formed by the bottom surface 163 recessing towards the top surface 161. The recess 165 includes a bottom wall and side walls formed by the recessing of the bottom surface 163, but the recess 165 is open (without side walls) on the radially outer peripheral surface of the valve plate 160. On the one hand, due to the formation of the recess 165, the valve hole 164 and the bypass hole 17 do not need to be directly aligned. Instead, as long as the opening of the bypass hole 17 formed on the second side surface of the scroll end plate 12 is within the range of the recess 165, the valve hole 164 and the bypass hole 17 can be communicated, which facilitates processing and installation. On the other hand, since the recess 165 is open on the radially outer peripheral surface of the valve plate 160, the allowable setting range of the bypass hole 17 is further expanded, enabling the bypass hole 17 to be arranged as close as possible to the radially outer side of the scroll disk 10, so that the bypass hole 17 can communicate with the intermediate compression chamber closer to the radially outer side, thereby obtaining a larger compression ratio adjustment range.

[0047] The following will describe the advantages of the first embodiment of the present invention, particularly the first sealing portion S1, in combination with Figure 12 and Figure 13 comparative examples. Figure 12 The scroll assembly 100' of the comparative example is shown. The basic structure and working principle of the scroll assembly 100' and the scroll compressor including the scroll assembly 100' are basically the same as those of the scroll assembly 100 and the scroll compressor including the scroll assembly 100 according to the first embodiment of the present invention, and will not be elaborated here.

[0048] As Figure 12 shown, in the comparative example, the scroll assembly 100' includes a scroll disk 10 and a pressure control valve 30, where the pressure control valve 30 is installed in the hub space A defined by the hub 16 of the scroll disk 10. The pressure control valve 30 includes a valve stopper 40, a valve piece 50, and a valve plate 60. As Figure 13 shown, the valve plate 60 is configured to be generally annular, and it includes a central opening 62 formed at the center of the valve plate 60 and valve holes 64 formed on both sides of the central opening 62. When the pressure control valve 30 is installed in place on the scroll disk 10, the central opening 62 is substantially aligned and communicated with the opening of the central exhaust hole 18 formed on the second side surface of the scroll end plate 12, and the valve holes 64 are substantially aligned and communicated with the opening of the bypass hole 17 formed on the second side surface of the scroll end plate 12. The valve piece 50 can cover the top surface of the valve plate 60 under the action of the pressure difference ( Figure 12shown as the upper surface) to close the valve hole 64, or (at least partially) move away from the top surface of the valve plate 60 to open the valve hole 64. The bottom surface 63 of the valve plate 60 opposite to its top surface ( Figure 12 shown as the lower surface) faces the second side surface of the scroll end plate 12. As Figure 13 shown, the bottom surface 63 of the valve plate 60 is substantially flat.

[0049] See Figure 12 , when the compressor is operating, a part of the high-pressure gas discharged from the central exhaust hole 18 may leak into the bypass hole 17 through the gap between the bottom surface 63 of the valve plate 60 and the second side surface of the scroll end plate 12, and / or a part of the high-pressure gas discharged from the central exhaust hole 18 may leak into the bypass hole 17 through the gap between the valve plate 60 and the valve stopper 40, the gap between the radially outer peripheral surface of the valve plate 60 and the radially inner peripheral surface of the hub 16, and the gap between the bottom surface 63 of the valve plate 60 and the second side surface of the scroll end plate 12. In addition, the high-pressure gas from the high-pressure area may also leak into the bypass hole 17 through the radially outer peripheral surface of the pressure control valve 30 (including the radially outer peripheral surface of the valve stopper 40 and the radially outer peripheral surface of the valve plate 60) and the gap between the bottom surface 63 of the valve plate 60 and the second side surface of the scroll end plate 12. The high-pressure gas leaking into the bypass hole 17 enters at least one intermediate compression chamber through the bypass hole 17, resulting in repeated compression of the working fluid and a decrease in the performance of the compressor.

[0050] To solve this leakage problem, in the comparative example, a seal, such as a metal-metal seal, may be formed between the bottom surface 63 of the valve plate 60 and the second side surface of the scroll end plate 12. This sealing method is more difficult to process and install and has a higher cost. In particular, in order to block the main leakage path, the bottom surface 63 of the valve plate 60 needs to form a seal with the second side surface of the scroll end plate 12 radially outside the bypass hole 17. This means that when the pressure control valve 30 is installed in place on the scroll end plate 12, the valve plate 63 has an outer edge wall 633 at a position radially outside the bypass hole 17, and the outer edge wall 633 meets the minimum wall thickness requirement so that an effective seal can be formed between the bottom surface area of the bottom surface 63 of the valve plate 60 located radially outside the bypass hole 17 and the second side surface of the scroll end plate 12. The presence of the outer edge wall 633 not only increases the difficulty of processing and installing the valve plate, but also limits the setting position of the bypass hole 17, that is, a scroll end plate surface for forming a seal needs to be left between the opening of the bypass hole 17 formed on the second side surface of the scroll end plate 12 and the radially inner peripheral surface of the hub 16, thereby limiting the pressure ratio adjustment range.

[0051] In contrast, in the scroll assembly according to the first embodiment of the present utility model, since the first sealing portion S1 is provided between the radially outer peripheral surface of the valve plate 160 and the radially inner peripheral surface of the hub portion 16, the sealing between the bottom surface of the valve plate and the second side surface of the scroll end plate can be substantially omitted, especially the sealing between the bottom surface region of the bottom surface of the valve plate located radially outside the bypass hole and the second side surface of the scroll end plate, thereby reducing the processing and installation difficulty and reducing the processing cost. In addition, the outer edge wall 633 of the valve plate can also be omitted, and the bottom surface region of the bottom surface of the valve plate located radially outside the bypass hole and the second side surface of the scroll end plate do not need to be sealed, making the processing and installation of the valve plate easier; at the same time, the allowable setting range of the bypass hole 17 can be expanded, thereby obtaining a larger compression ratio adjustment range. In addition, the first sealing portion S1 can be composed of a sealing groove and a sealing member, which is simpler and more reliable in processing and installation compared with metal-metal sealing.

[0052] As Figure 1 shown, the bypass hole 17 is configured as a staggered hole in which one section in the axial direction is radially offset outward compared with another section, so that the bypass hole 17 can communicate with the intermediate compression chamber as close as possible to the radially outer side, thereby achieving the largest possible compression ratio adjustment range.

[0053] However, those skilled in the art can also understand that the bypass hole can also be configured as a straight hole extending in a straight line in the axial direction, as Figure 7 shown. Figure 7 Fig. shows a scroll assembly 300 according to a first variant of the first embodiment of the present utility model. The scroll assembly 300 includes a scroll disk 10 and a pressure control valve 330. Among them, the bypass hole 37 formed in the scroll end plate 12 of the scroll disk 10 is configured as a straight hole to reduce pressure loss, simplify the processing process, and reduce the manufacturing cost. As described above, since the outer edge wall of the valve plate is omitted, the concave portion 165 of the valve plate is open on the radially outer peripheral surface of the valve plate, thereby further expanding the allowable setting range of the bypass hole. Therefore, although the bypass hole 37 is configured as a straight hole in this embodiment, the opening of the bypass hole 37 formed on the second side surface of the scroll end plate 12 can be arranged adjacent to the hub portion 16, that is, the bypass hole 37 can still communicate with the intermediate compression chamber as close as possible to the radially outer side, thereby ensuring the compression ratio adjustment range.

[0054] On the other hand, on the basis that the opening of the bypass hole formed on the second side surface of the scroll end plate 12 is arranged adjacent to the hub portion 16, the bypass hole can also be retained in the form of a staggered hole, for example as Figure 8 and Figure 9 shown. Figure 8Shows a scroll assembly 400 according to a second variant of the first embodiment of the present utility model. The scroll assembly 400 includes a scroll disk 10 and a pressure control valve 430. Among them, the bypass hole 47 formed in the scroll end plate 12 of the scroll disk 10 is configured as a staggered hole. The bypass hole 47 axially includes a first section (shown as the upper section in Figure 8 ), and a second section (shown as the lower section in Figure 8 ). The central axis of the second section of the bypass hole 47 is radially outwardly offset with respect to the central axis of the first section. The opening of the bypass hole 47 (first section) formed on the second side surface of the scroll end plate 12 is disposed adjacent to the hub portion 16. Thus, the opening of the bypass hole 47 (second section) formed on the second side surface of the scroll end plate 12 can be further outwardly displaced, thereby allowing earlier bypass and a larger compression ratio adjustment range.

[0055] Preferably, the recess 165 extends radially inward from the radially outer peripheral surface of the valve plate 160 to a position between the central opening 162 and the valve hole 164 of the valve plate 160. That is to say, the bottom surface 163 of the valve plate 160 forms a stepped portion at a position between the central opening 162 and the valve hole 164 where the recess 165 extends. On the radially outer side of this stepped portion (within the range of the recess 165), the bottom surface 163 of the valve plate 160 does not contact the second side surface of the scroll end plate 12, while on the radially inner side of this stepped portion, the bottom surface 163 of the valve plate 160 can contact the second side surface of the scroll end plate 12, thereby allowing a seal to be formed between the bottom surface 163 of the valve plate 160 and the second side surface of the scroll end plate 12 on the radially inner side of the stepped portion to prevent high-pressure gas from the central exhaust hole from leaking through the gap between the bottom surface 163 of the valve plate 160 and the second side surface of the scroll end plate 12, as will be described in detail below.

[0056] Figure 5 and Figure 6The valve plate 260 of the pressure control valve of the scroll assembly according to the second embodiment of the present utility model is shown. The structure, installation and working principle of the scroll assembly are basically the same as those of the first embodiment of the present utility model, and will not be elaborated herein. The difference lies in that the scroll assembly not only includes the first sealing portion S1, but also includes the second sealing portion S2. Specifically, the bottom surface 263 of the valve plate 260 (or the bottom surface of the pressure control valve) includes a first bottom surface area 2631 and a second bottom surface area 2632 respectively located inside and outside the radial direction of the bypass hole 17. The second bottom surface area 2632 is not sealed with the second side surface of the scroll end plate 12, while a second sealing portion S2 is provided between the first bottom surface area 2631 and the second side surface of the scroll end plate 12. The second sealing portion S2 includes a sealing groove 267 formed at the first bottom surface area 2631 of the valve plate 260 and arranged around the central opening 262 of the valve plate 260, and a sealing member 280 installed in the sealing groove 267. Those skilled in the art can understand that, alternatively, a sealing groove can also be formed on the second side surface of the scroll end plate 12 or sealing half-grooves can be formed on both the second side surface of the scroll end plate 12 and the first bottom surface area 2632 of the valve plate 260, and corresponding sealing members can be provided to form the second sealing portion S2. Preferably, the sealing member 280 is configured as an O-ring to reduce production and installation costs and improve reliability. However, those skilled in the art can understand that the second sealing portion S2 is not limited to being composed of a sealing groove and a sealing ring, and can also be formed in other forms such as a metal-metal seal.

[0057] In the second embodiment according to the present utility model, due to the arrangement of both the first sealing portion S1 and the second sealing portion S2, it is not only possible to block the leakage path of the high-pressure gas from the gap between the radial outer peripheral surface of the valve plate and the radial inner peripheral surface of the hub portion and the gap between the bottom surface (the second bottom surface area 2632) of the valve plate and the second side surface of the scroll end plate to the bypass hole, but also possible to block the leakage path of the gap between the bottom surface (the first bottom surface area 2631) of the valve plate and the second side surface of the scroll end plate to the bypass hole, thereby being able to more effectively avoid the problems of repeated compression and compressor performance degradation caused by the backflow of the high-pressure gas through the bypass hole.

[0058] Those skilled in the art can understand that the second sealing portion S2 is not limited to being provided between the first bottom surface area 2631 of the valve plate and the second side surface of the scroll end plate 12. As Figure 10The scroll assembly 500 according to the third embodiment of the present invention as shown provides a different way of arranging the second sealing portion S2. In this third embodiment, the structure, installation, and working principle of the scroll assembly are basically the same as those of the second embodiment of the present invention, and will not be elaborated here. The difference lies in that the scroll plate 10 further includes an inner peripheral wall portion 19 formed on the second side of the scroll end plate around the central exhaust hole 18, and the second sealing portion S2 is arranged between the radially inner peripheral surface of the pressure control valve and the radially outer peripheral surface of the inner peripheral wall portion 19. Specifically, the inner peripheral wall portion 19 extends axially in a direction away from the scroll end plate 12 from the second side surface of the scroll end plate 12, and the radially inner peripheral surface of the inner peripheral wall portion 19 can be flush with the hole wall surface defining the central exhaust hole 18 to form an integral surface for convenient processing. When the pressure control valve 530 is installed in place on the scroll end plate 12, the inner peripheral wall portion 19 extends into the central opening of the valve plate 560, thereby allowing the second sealing portion S2 to be arranged between the radially inner peripheral surface of the valve plate 560 (i.e., the circumferential surface defining the central opening of the valve plate 560) and the radially outer peripheral surface of the inner peripheral wall portion 19. The second sealing portion S2 includes a sealing groove 567 formed on at least one of the radially inner peripheral surface of the valve plate 560 and the radially outer peripheral surface of the inner peripheral wall portion 19 of the scroll end plate 12 and a seal 580 installed in the sealing groove 567. Preferably, the seal 580 is configured as an O-ring to reduce production and installation costs and improve reliability. However, those skilled in the art can understand that the second sealing portion S2 is not limited to being composed of a sealing groove and a sealing ring, and can also be formed in other forms such as a metal-metal seal.

[0059] In the third embodiment according to the present invention, the arrangement of the first sealing portion S1 and the second sealing portion S2 can not only ensure an effect similar to that of the second embodiment of the present invention in avoiding the backflow of high-pressure gas, but also, since both the first sealing portion S1 and the second sealing portion S2 are arranged between adjacent circumferential surfaces, there is no need to process and align the installation of the bottom surface of the pressure control valve and the top surface of the scroll end plate, thereby further simplifying the processing technology and reducing the installation difficulty.

[0060] Those skilled in the art can also understand that the first sealing portion S1 is not limited to being arranged between the radially outer peripheral surface of the valve plate and the radially inner peripheral surface of the hub portion. As Figure 11The scroll assembly 600 according to the fourth embodiment of the present utility model as shown provides a different way of arranging the second sealing portion S1. In this fourth embodiment, the structure, installation, and working principle of the scroll assembly are substantially the same as those of the third embodiment of the present utility model, and will not be elaborated herein. The difference lies in that the second sealing portion S2 is arranged between the radial outer peripheral surface of the valve stop 640 and the radial inner peripheral surface of the hub portion 16, rather than between the radial outer peripheral surface of the valve plate 660 and the radial inner peripheral surface of the hub portion 16. Specifically, the valve stop 640 is configured to be generally annular, and a generally annular sealing groove 646 is formed on its radial outer peripheral surface and arranged around the outer periphery of the valve stop 640. A seal 670 can be received in the sealing groove 646. When the pressure control valve 630 is installed in place on the scroll end plate 12, the sealing groove 646 and the seal 670 together form the first sealing portion S1 arranged between the radial outer peripheral surface of the valve stop 640 and the radial inner peripheral surface of the hub portion 16. Those skilled in the art can understand that alternatively, a sealing groove can also be formed on the radial inner peripheral surface of the hub portion 16 or sealing half-grooves can be formed on both the radial inner peripheral surface of the hub portion 16 and the radial outer peripheral surface of the valve stop 640, and seals can be arranged accordingly to form the first sealing portion S1. Preferably, the seal 670 is configured as an O-ring to reduce production and installation costs and improve reliability. However, those skilled in the art can understand that the first sealing portion S1 is not limited to being composed of a sealing groove and an O-ring, and can also be formed in other forms such as a metal-metal seal etc.

[0061] Preferably, in order to more comprehensively block the leakage of high-pressure gas towards the bypass hole, when the first sealing portion S1 is arranged between the radial outer peripheral surface of the valve stop 640 and the radial inner peripheral surface of the hub portion 16, a third sealing portion S3 can also be arranged between the valve stop 640 and the valve plate 660. Specifically, the third sealing portion S3 can be arranged at a position close to the radial outer peripheral surfaces of the valve stop 640 and the valve plate 660 and extend circumferentially. The third sealing portion S3 includes a bottom surface (shown as the lower surface in Figure 11 and a top surface (shown as the upper surface in Figure 11A sealing groove on at least one of them (shown as the upper surface in the figure) and a seal installed in the sealing groove. For example, the valve retainer 640 may be formed with a downwardly extending skirt along its outer circumferential edge, and a third sealing portion S3 is provided between the lower end surface of the skirt and the top surface of the valve plate 660, while the valve piece is located radially inside the skirt. Preferably, the seal is configured as an O-ring seal to reduce production and installation costs and improve reliability. However, those skilled in the art can understand that the third sealing portion S3 is not limited to being composed of a sealing groove and an O-ring seal, and may also be formed in other forms such as a metal-metal seal. Thus, in the fourth embodiment according to the present invention, the provision of the first sealing portion S1 and the third sealing portion S3 can block the leakage path of high-pressure gas to the bypass hole through the gap between the radially outer peripheral surface of the valve plate and the radially inner peripheral surface of the hub portion and the gap between the bottom surface of the valve plate (the second bottom surface region 2632) and the second side surface of the scroll end plate, and the provision of the second sealing portion S2 can block the leakage path of the gap between the bottom surface of the valve plate (the first bottom surface region 2631) and the second side surface of the scroll end plate to the bypass hole, thereby being able to more effectively avoid the problems of repeated compression and reduced compressor performance caused by the backflow of high-pressure gas through the bypass hole.

[0062] The scroll assembly and the scroll compressor according to the preferred embodiments of the present invention have been described above in conjunction with specific embodiments. It can be understood that the above description is only exemplary and not restrictive. Without departing from the scope of the present invention, those skilled in the art can conceive of various variations and modifications with reference to the above description. These variations and modifications are also included within the protection scope of the present invention.

Claims

1. A scroll assembly, the scroll assembly comprising a scroll disk and a pressure control valve, the scroll disk including a scroll end plate, scroll vanes formed on a first side of the scroll end plate, and a hub portion formed on a second side of the scroll end plate opposite to the first side, the hub portion defining a hub cavity, the scroll end plate including a central exhaust hole formed at the center of the scroll end plate and a bypass hole formed radially outside the central exhaust hole. Among them, The pressure control valve is disposed in the hub cavity and is configured to open and close the bypass hole. Characterized in that a first sealing portion is provided between the radially outer peripheral surface of the pressure control valve and the radially inner peripheral surface of the hub portion.

2. The scroll assembly according to claim 1, wherein, The pressure control valve includes a bottom surface disposed opposite to the second side surface of the scroll end plate, the bottom surface including a first bottom surface region and a second bottom surface region respectively located radially inside and radially outside the bypass hole, wherein a second sealing portion is provided between the first bottom surface and the second side surface of the scroll end plate.

3. The scroll assembly according to claim 2, wherein, There is no seal between the second bottom surface region and the second side surface of the scroll end plate.

4. The scroll assembly according to claim 1, characterized in that, The scroll disk further includes an inner peripheral wall portion formed on the second side of the scroll end plate around the central exhaust hole, and a second sealing portion is provided between the radially inner peripheral surface of the pressure control valve and the radially outer peripheral surface of the inner peripheral wall portion.

5. The scroll assembly according to claim 1, wherein, The bypass hole is configured as a straight hole, or the bypass hole is configured as a staggered hole in which one section in the axial direction is radially offset outward compared to another section.

6. The scroll assembly according to claim 1, wherein The opening of the bypass hole formed on the second side surface of the scroll end plate is adjacent to the hub portion.

7. The scroll assembly according to any one of claims 1 to 6, characterized in that, The pressure control valve includes a valve plate, a valve piece, and a valve stopper. Wherein, the first sealing portion is provided between the radially outer peripheral surface of the valve plate and the radially inner peripheral surface of the hub portion, or the first sealing portion is provided between the radially outer peripheral surface of the valve stopper and the radially inner peripheral surface of the hub portion.

8. The scroll assembly according to claim 7, wherein, The first sealing portion is provided between the radially outer peripheral surface of the valve stopper and the radially inner peripheral surface of the hub portion, and a third sealing portion is provided between the valve plate and the valve stopper.

9. The scroll assembly according to any one of claims 1 to 6, characterized in that, The pressure control valve includes a valve plate, a valve piece, and a valve stopper, and the valve plate is formed with a valve hole for communicating with the bypass hole. The valve plate forms a recess on a side of the valve plate disposed opposite to the second side surface of the scroll end plate, the valve hole is located in an area defined by the recess, and the radially outer end of the recess is flush with the radially outer end of the valve plate.

10. The scroll assembly according to claim 9, wherein, The valve plate further includes a central opening formed at the center of the valve plate for communicating with the central exhaust hole, and the recess extends radially inward from the radially outer end of the valve plate to a position between the central opening and the valve hole.

11. The scroll assembly according to any one of claims 1 to 6, characterized in that, The first sealing portion includes a sealing groove formed on at least one of the radially outer peripheral surface of the pressure control valve and the radially inner peripheral surface of the hub portion and a sealing member installed in the sealing groove.

12. A scroll compressor, characterized in that, The scroll compressor includes the scroll assembly according to any one of claims 1 to 11.

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