Compression mechanism

Abstract

The present disclosure provides a compression mechanism, which includes: a moving scroll, the moving scroll includes a moving scroll end plate and a moving scroll formed on one side of the moving scroll end plate; a fixed scroll, the fixed scroll includes a fixed scroll end plate and a fixed scroll formed on one side of the fixed scroll end plate, and an exhaust port is formed in the fixed scroll end plate; and a valve assembly, the valve assembly includes a valve plate, the valve plate includes an arc-shaped first body portion and a single moving portion extending from the first body portion, and the moving portion includes a movable end that can selectively open or close the exhaust port. According to the present disclosure, a compressor with a variable volume ratio function that is not limited by the installation space and has a simple structure can be provided.

Description

Technical Field

[0001] The present disclosure relates to the technical field of scroll compressors, and more particularly, to a compression mechanism of a scroll compressor having a variable volume ratio function. Background Art

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

[0003] Compressors may be applied in application systems that require different pressures, such as air conditioning systems, cold storage 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 occurs. In the case of over-compression, the fluid compressed to the discharge pressure will drop to the pressure required by the application system after discharging from the compression chamber. Therefore, the compressor does unnecessary work, which will reduce the efficiency of the compressor.

[0004] In order to reduce or prevent over-compression of the working fluid, compressors with variable volume ratio functions have been developed. Such compressors can achieve a variable volume ratio by using a bypass valve provided in the secondary exhaust port, that is, operate at a low volume ratio when the pressure required by the system is low and operate at a high volume ratio when the pressure required by the system is high, thereby effectively avoiding over-compression phenomena and improving the efficiency of the compressor. However, in the field of compressors, there are still technical problems such as the inability to set a bypass valve due to limited installation space, resulting in the inability to achieve the variable volume ratio function, or the structure for achieving the variable volume ratio function is complex, prone to leakage, and high in cost. Summary of the Invention

[0005] An object of one or more embodiments of the present disclosure is to provide a compression mechanism of a compressor, which can achieve a variable volume ratio function in a simple and low-cost manner in a limited installation space.

[0006] Another object of one or more embodiments of the present disclosure is to provide a compression mechanism of a compressor, in which the fastener of the bypass valve can provide a uniform downward pressure to prevent the bypass valve from tipping over.

[0007] According to one aspect of the present disclosure, a compression mechanism is provided. The compression mechanism includes: a moving scroll, which includes a moving scroll end plate and a moving scroll wrap formed on one side of the moving scroll end plate; a fixed scroll, which includes a fixed scroll end plate and a fixed scroll wrap formed on one side of the fixed scroll end plate, an exhaust port is formed in the fixed scroll end plate, and the fixed scroll and the moving scroll cooperate to form a series of compression chambers therebetween; and a valve assembly. The valve assembly includes a valve plate, the valve plate includes an arc-shaped first body portion and a single moving portion extending from the first body portion, and the moving portion includes a movable end that can selectively open or close the exhaust port.

[0008] According to one aspect of the present disclosure, the valve assembly further includes: a valve stopper, the valve stopper includes a second body portion and a limiting portion extending from the second body portion, the second body portion abuts against the first body portion and the limiting portion is configured to limit the movement range of the movable end; and an annular fastener, the annular fastener is fixed to the fixed scroll and is configured to abut against the second body portion to fix the axial positions of the valve plate and the valve stopper.

[0009] According to one aspect of the present disclosure, the valve assembly further includes a positioning pin, the positioning pin extends through the pin hole of the valve plate and the pin hole of the valve stopper and extends into the pin hole of the fixed scroll end plate to prevent the circumferential displacement of the valve plate.

[0010] According to one aspect of the present disclosure, the exhaust port includes a main exhaust port and a secondary exhaust port, the main exhaust port is in fluid communication with the central compression chamber in the series of compression chambers, and the secondary exhaust port is in fluid communication with an intermediate compression chamber located radially outside the central compression chamber, and the movable end selectively opens or closes the secondary exhaust port.

[0011] According to one aspect of the present disclosure, the intermediate compression chamber includes a first intermediate compression chamber and a second intermediate compression chamber, and a fluid passage for fluid communication therebetween is provided between the first intermediate compression chamber and the second intermediate compression chamber.

[0012] According to one aspect of the present disclosure, an inner annular wall is provided on the side of the fixed scroll end plate opposite to the fixed scroll wrap, the main exhaust port and the secondary exhaust port are formed in the exhaust area defined by the inner annular wall, and the valve assembly is provided radially inside the inner annular wall.

[0013] According to one aspect of the present disclosure, the main exhaust port includes a first main exhaust port portion and a second main exhaust port portion that communicate with each other, the first main exhaust port portion is located at the center of the fixed scroll end plate and communicates with the central compression chamber, and the second main exhaust port portion is radially offset from the first main exhaust port portion and communicates with the exhaust area.

[0014] According to one aspect of the present disclosure, the circumferential angle corresponding to the first body portion is greater than 180 degrees.

[0015] According to one aspect of the present disclosure, the moving portion extends substantially linearly from one end of the first body portion, and the free end of the moving portion forms the movable portion, and the free end of the moving portion is close to the imaginary outer circumference defined by the first body portion and / or close to the free end of the first body portion.

[0016] According to one aspect of the present disclosure, the width of the first body portion is smaller than the width of the moving portion.

[0017] The compressor structure according to the present disclosure can save the installation space of the bypass valve, prevent fluid leakage, and reduce the production and processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way.

[0019] Figure 1 A schematic longitudinal sectional view of an exemplary compressor having a variable volume ratio function;

[0020] Figure 2A and Figure 2B A perspective view schematically showing a fixed scroll and a bypass valve of another compressor having a variable volume ratio function;

[0021] Figure 3 A perspective view schematically showing a fixed scroll and a bypass valve of a compressor according to an exemplary embodiment of the present disclosure;

[0022] Figure 4 and Figure 5 A sectional view and a top view schematically showing a fixed scroll of a compressor according to an exemplary embodiment of the present disclosure, respectively, wherein the bypass valve is installed in the inner space of the inner annular wall of the fixed scroll;

[0023] Figure 6 A top view schematically showing a fixed scroll of a compressor according to an exemplary embodiment of the present disclosure, wherein the bypass valve is removed;

[0024] Figure 7A and Figure 7B A top view schematically showing a valve plate of a bypass valve and its variants of a compressor according to an exemplary embodiment of the present disclosure;

[0025] Figure 8 A perspective view schematically showing a fixed scroll of a compressor according to an exemplary embodiment of the present disclosure, wherein the bypass valve is removed; and

[0026] Figure 9 Schematically shows the main exhaust port arrangement of a compressor according to an embodiment of the present disclosure. Detailed implementation manner

[0027] The following descriptions of the embodiments of the present disclosure are merely exemplary and in no way limit the present disclosure and its application or use. The same reference numerals are used to denote the same components in the various drawings, so the construction of the same components will not be described repeatedly.

[0028] The following will refer to Figure 1 to describe an exemplary compressor with a variable volume ratio. As Figure 1 shown, the compressor 1 may include a housing 20, a drive mechanism, a compression mechanism, a sealing assembly, and a valve assembly.

[0029] Specifically, the housing 20 may be composed of a generally cylindrical body portion 22, a top cover 24 provided at one end of the body portion 22, and a bottom cover 26 provided at the other end of the body portion 22. A partition 30 is provided between the top cover 24 and the body portion 22 to divide the internal space of the housing 20 into a fluid suction chamber 21 and a fluid discharge chamber 23. The space between the partition 30 and the top cover 24 constitutes the fluid discharge chamber 23, and the space between the partition 30, the body portion 22, and the bottom cover constitutes the fluid suction chamber 21. An intake joint for sucking fluid is provided on one side of the fluid suction chamber 21, and an exhaust joint for discharging the compressed fluid is provided on one side of the fluid discharge chamber 23.

[0030] A compression mechanism and a drive mechanism for driving the compression mechanism are provided in the housing 20. The compression mechanism sucks fluid from the fluid suction chamber 21 of the housing 20 and compresses and discharges the fluid into the fluid discharge chamber 23 of the housing 20. More specifically, refer to Figure 1, the compression mechanism may include, for example, a fixed scroll 40 and a moving scroll 50. The moving scroll 50 includes an end plate 54 and a spiral moving scroll wrap 56 formed on one side of the end plate. The fixed scroll 40 includes an end plate 44 and a spiral fixed scroll wrap 46 formed on one side of the end plate. The end plate 44 includes a main exhaust port 42 formed at a substantially central position of the end plate, and a first secondary exhaust port 64 and a second secondary exhaust port 66 located radially outside the exhaust port 42. The fixed scroll wrap 46 of the fixed scroll 40 and the moving scroll wrap 56 of the moving scroll 50 mesh with each other to form a series of compression chambers between them with gradually decreasing volume and gradually increasing pressure from the radially outer side to the radially inner side. Specifically, the pressure in the outermost compression chamber in the radial direction is the lowest, the pressure in the innermost compression chamber, i.e., the central compression chamber C1 at the central position of the scroll, is the highest, and the multiple intermediate compression chambers located between the outermost and innermost positions in the radial direction have intermediate pressures between the maximum and minimum pressures. The exhaust port 42 is in fluid communication with the central compression chamber (the fluid communication described in this part corresponds to direct fluid communication), while the first secondary exhaust port 64 and the second secondary exhaust port 66 are respectively in fluid communication with the first intermediate compression chamber C2 and the second intermediate compression chamber C3 located on both sides of the central compression chamber.

[0031] To achieve axial sealing between the tip of the fixed scroll wrap 46 of the fixed scroll 40 and the end plate 54 of the moving scroll 50, and between the tip of the moving scroll wrap 56 of the moving scroll 50 and the end plate 44 of the fixed scroll 40, generally, a back pressure chamber 70 is provided on the side of the end plate 44 of the fixed scroll 40 opposite to the fixed scroll wrap 46. More specifically, an inner annular wall 43 and an outer annular wall 45 are formed on the end plate 44. The inner annular wall 43 defines an exhaust area including the main exhaust port 42 and the secondary exhaust ports 64, 66. The back pressure chamber 70 is formed by the space surrounded by the end plate 44, the inner annular wall 43, and the outer annular wall 45 and is closed by a sealing assembly provided therein. The sealing assembly isolates the medium-pressure back pressure chamber area from the high-pressure exhaust area and the low-pressure suction area. The back pressure chamber 70 is in fluid communication with a medium-pressure chamber in the compression chamber between the moving scroll 50 and the fixed scroll 40 through an axially extending through hole (not shown) formed in the end plate 44, thereby forming a force that presses the fixed scroll 40 towards the moving scroll 50. The pressure in the back pressure chamber 70 can effectively press the fixed scroll 40 and the moving scroll 50 together.

[0032] Generally, a bypass valve 80 can be provided in the scroll mechanism to prevent excessive compression of the working fluid. During the operation of the compressor 1, the working fluid is sucked into the compression mechanism and compressed as it flows from the radially outermost position to the radially innermost position. The compressed fluid is discharged through the main exhaust port 42 to the exhaust region defined by the inner annular wall 43, and then discharged to the discharge chamber 23 via a check valve provided at the central position of the partition plate 30. In the case of excessive compression, the fluid can be prematurely discharged to the exhaust region through the auxiliary exhaust port before reaching the radially innermost position. Specifically, when the pressure of the fluid in the compression chamber at the radially intermediate position is greater than the pressure of the fluid in the discharge chamber 23 (i.e., excessive compression occurs), the bypass valve selectively opens the auxiliary exhaust ports 64, 66, thereby allowing the fluid to be prematurely discharged. When the pressure of the fluid contained in the compression chamber at the radially intermediate position is less than the pressure of the fluid in the discharge chamber 23, the bypass valve selectively closes and seals the auxiliary exhaust ports 64, 66.

[0033] In the compressor 1, in order for the back pressure chamber 70 to provide a stable and sufficient pressure to effectively prevent fluid leakage between the respective compression chambers, it is necessary to ensure that the back pressure chamber 70 has sufficient space. As a result, the space inside the inner annular wall 43 is very limited. In particular, for a small-displacement scroll compressor, the space inside the inner annular wall 43 may have a diameter of only 20 mm - 30 mm. In this case, since the volume of the bypass valve is relatively large compared to the scroll, there is a problem that it is difficult to fit the bypass valve inside the inner annular wall 43 to achieve the variable volume ratio function.

[0034] To solve this problem, one way is to adopt Figure 2A and Figure 2B the split-type bypass valve shown. Figure 2A and Figure 2B Schematically show the fixed scroll and the bypass valve of another compressor with a variable compression ratio function. The compressor uses a cover plate 220 to divide the exhaust region and the back pressure chamber into upper and lower parts, so that the installation space of the bypass valve is not restricted by the inner annular wall 43 as in the Figure 1 compressor. Specifically, referring to Figure 2A , the fixed scroll end plate 144 and the cover plate 220 are fastened together by a plurality of screws 210. Among them, the fixed scroll end plate 144 is provided with a groove 208 on the side opposite to the formation of the scroll. The groove 208 is formed around the exhaust port 202 and the auxiliary exhaust ports 164, 166, so as to form an exhaust region in the groove 208 (i.e., the lower side of the cover plate 220).

[0035] A corresponding bypass valve 200 is provided on each of the auxiliary exhaust ports 164 and 166. The bypass valve 200 allows fluid to flow from the compression chamber to the exhaust region and prevents fluid from flowing from the exhaust region to the compression chamber. The bypass valve 200 may include a valve plate 220 covering the auxiliary exhaust ports 164 and 166, a valve stop 230 for preventing excessive deformation of the valve plate 220, and screws 240 for fastening the valve plate 220 and the valve stop 230 to the fixed scroll. The valve plate 220 has a movable portion 226 and a fixed portion 224, and the movable portion 226 is capable of shifting between an open position and a closed position relative to the fixed portion 224. The screws 240 extend through the valve plate 220 and the valve stop 230 and are fixed to valve fixing holes formed in the fixed scroll end plate 144, thereby restricting the axial and circumferential positions of the valve plate 220 and the valve stop 230.

[0036] A recess 222 is formed on the upper side of the cover plate 220. The recess 222 is in fluid communication with the medium pressure chamber in the compression chamber through a medium pressure hole, and a sealing assembly may be provided in the recess 222 to form a back pressure chamber for providing an axial sealing force to the fixed scroll. A gasket 250 is provided between the cover plate 220 and the fixed scroll end plate 144.

[0037] However, in Figure 2A and Figure 2B In the split-type compressor shown, due to the presence of the upper cover plate, the fixed scroll is divided into upper and lower layers, and the overall height of the fixed scroll increases, thereby correspondingly increasing the height and volume of the compressor, resulting in an increase in the production cost of the compressor. In addition, since there is a large pressure in the exhaust region between the cover plate 220 and the fixed scroll end plate 144, there is a risk of fluid leakage due to incomplete sealing between the thread-connected cover plate 220 and the fixed scroll end plate 144, which may lead to a decline in the performance of the compressor. And since additional cover plates 220, gaskets 250 and corresponding fasteners are required, this makes the structure complex and increases the production and processing costs.

[0038] To solve the above problems, the present inventor has conceived an improved compressor structure, which can not only save the installation space required for the bypass valve but also prevent fluid leakage and reduce the production and processing costs.

[0039] Next, in combination with Figures 3 to 8 The compressor according to an exemplary embodiment of the present disclosure will be further described in detail, wherein the same reference numerals in the drawings denote the same components and the detailed description of these components will be omitted.

[0040] The compressor according to an exemplary embodiment of the present disclosure is the same as Figure 1The compressor structures are basically similar, and the difference lies only in that the fixed scroll 40A of the compressor according to the present disclosure is provided with a bypass hole 64 and a bypass valve 100 is provided in the inner annular wall 43 of the fixed scroll 40A. As Figure 3 shown, the bypass valve 100 may include a valve plate 120. The valve plate 120 includes an arcuate first body portion 122 and a single moving portion 124 extending from the first body portion 122. The moving portion 124 includes a movable end 126 that can selectively open or close the secondary exhaust port 64 ( Figure 4 and Figure 6 shown in). Still referring to Figure 3 , the bypass valve 100 may further include a valve stopper 140 and an annular fastener 180. The valve stopper 140 corresponds to the shape of the valve plate 120 and includes an arcuate second body portion 142 and a limiting portion 144 extending from the second body portion 142. In the assembled state, the second body portion 142 abuts against the first body portion 122 and the limiting portion 144 is formed with an inclined surface to limit the maximum movement range of the movable end 126. The annular fastener 180 is fixed to the inner annular wall 43 of the fixed scroll 40A and is configured to abut against the second body portion to limit the axial positions of the valve plate 120 and the valve stopper 140. The fastening force of the annular fastener 180 is applied to the second body portion 142 of the valve stopper 140 and the first body portion 122 of the valve plate 120, so that the second body portion 142 abuts against the whole of the first body portion 122 and holds the whole of the first body portion 122 fixed. Such an annular fastener can provide a uniform downward pressure and prevent the bypass valve 100 from tipping over.

[0041] The annular fastener 180 can be detachably connected to the internal thread of the inner annular wall 43, for example, by a threaded connection, so as to detachably fix the bypass valve 100 to the radial inner side of the inner annular wall 43. The annular fastener 180 may further be formed with two symmetrically arranged notches 182, so that it is convenient to use tools to fix or separate the annular fastener 180 from the inner annular wall 43, which is beneficial to the installation and maintenance of the bypass valve 100.

[0042] The bypass valve 100 may further include a positioning pin 160. The positioning pin 160 extends through the pin holes 123, 125 of the valve plate 120, the pin holes 143, 145 of the valve stopper 140 and extends to the pin holes 46, 48 of the fixed scroll ( Figure 6 shown in), so as to prevent the valve plate 120 from circumferentially shifting. The two pin holes 123, 125 of the valve plate 120 are respectively provided at the junction of the first body portion and the moving portion and at a portion of the first body portion between the junction and the free end of the first body portion. The pin holes 143, 145 of the valve stopper 140 and the pin holes 46, 48 of the scroll can be arranged corresponding to the two pin holes 123, 125 of the valve plate 120.

[0043] The bypass valve 100 according to the present disclosure includes only a single moving part 124, which requires only a small installation space and thus can be installed in a small-displacement compressor, thereby realizing the variable compression ratio function. In addition, compared with Figure 2A and Figure 2B the split compressor shown, the compressor according to the exemplary embodiment of the present disclosure can avoid using additional cover plates, gaskets, and corresponding fasteners, reduce the processing cost and component cost, and prevent fluid leakage in the high-pressure exhaust area between the cover plate and the fixed scroll end plate. Moreover, the compressor structure according to the exemplary embodiment of the present disclosure has high structural compatibility, can be applied to most scrolls, and can maintain the external dimensions of the existing compressor.

[0044] In addition, since the annular fastener 180 can uniformly apply a downward fastening force to the arc-shaped second body portion 142 of the valve stopper 140 and the arc-shaped first body portion 122 of the valve plate 120 on its circumference, the fastener 180 can firmly fasten the valve stopper 140 and the valve plate 120 to the fixed scroll. Compared with the bypass valve using screws as fasteners shown in FIG. 2 for example, this annular fastener 180 distributes the pressing force uniformly along almost the entire annular body portion, changing the point force application to annular surface force application, thereby effectively preventing stress concentration, extending the service life of the bypass valve, and enabling the bypass valve to be held more firmly and stably in the fixed scroll.

[0045] Figure 7A and Figure 7B show the valve plate 120 and its variant 120A respectively. Referring to Figure 7A , the arc-shaped first body portion 122 preferably can correspond to a circumferential angle greater than 180° (i.e., the arc length is greater than a semi-circle). In this way, on the one hand, it can enable the annular fastener 180 to have a sufficiently large acting area on the valve plate 120, facilitating the provision of a uniform pressing force. On the other hand, the longer arc-shaped body portion can have a larger blank space inside it to avoid the main exhaust port 42. More preferably, the first body portion 122 preferably can have a circumferential angle corresponding to 220°. In addition, the width of the first body portion 122 can be smaller than the width of the moving part 124. The wider moving part 124 can ensure that the moving part can maintain sufficient strength during the repeated up and down movement of the movable end 126, preventing fracture failure. At the same time, the thinner body portion 122 can ensure sufficient space for the main exhaust port 42, preventing interference with the fluid discharge of the main exhaust port.

[0046] Although the case of providing two positioning pins 160 is schematically shown in FIG. 2, those skilled in the art can understand that the bypass valve 100 can also include only one positioning pin 160. Figure 7BShows the structure of the valve plate 120A when the bypass valve 100 includes only one positioning pin 160. Refer to Figure 7B , the pin hole 125 of the valve plate 120A can be arranged at the junction of the first body portion 122 and the moving portion 124. Accordingly, the pin hole 145 and the pin hole 48 in the fixed scroll end plate can be arranged corresponding to the pin hole 125. When the moving portion 124 moves relative to the first body portion 122, the positioning pin 160 extending through the pin hole 125 located at the junction can effectively prevent the valve plate 120A from circumferentially shifting. Specifically, circumferential shifting of the valve plate 120A can be avoided by the single positioning pin 160 and the arc-shaped first body portion 122. As Figure 7A and 7B shown, the moving portion 124 extends substantially linearly from one end of the first body portion 122, and the free end of the moving portion forms a movable end 126. The free end of the moving portion 235 is close to the imaginary outer circumference defined by the first body portion 122 and / or close to the free end of the first body portion 122.

[0047] Preferably, in a compressor according to an exemplary embodiment of the present disclosure, a fluid passage for communicating them may be provided between the first intermediate compression chamber C2 and the second intermediate compression chamber C3. Figure 8 Shows an exemplary fixed scroll provided with a fluid passage according to the present disclosure, in which the bypass valve 100 is not shown. The second intermediate compression chamber C3 may be symmetric with respect to the first intermediate compression chamber C2 about the central compression chamber C1. A fluid passage 300 may be provided between the first intermediate compression chamber C2 and the second intermediate compression chamber C3. The fluid passage includes sections 310, 320, and 330. In the description of the present application, intermediate compression chambers having substantially the same pressure and cavity volume during the operation of the compressor are referred to as a group of first intermediate compression chambers and second intermediate compression chambers. A group of intermediate compression chambers exhaust simultaneously to avoid over-compression or under-compression of a certain compression chamber caused by non-simultaneous exhaust, and improve the performance of the compressor. In a symmetric single-scroll compressor, the compression chambers are symmetric with respect to the central compression chamber, and the pressures and volumes in two symmetric compression chambers are basically the same, and can be used as a group of intermediate compression chambers. In a double-scroll compressor, there may be two groups (i.e., four) of intermediate compression chambers having substantially the same pressure and volume at the same time. In an asymmetric scroll design, the compression chambers formed by the fixed scroll and the moving scroll are asymmetric with respect to the central compression chamber. Therefore, the first intermediate compression chamber C2 may also be asymmetric with respect to the second intermediate compression chamber C3. Since a fluid passage is provided between the first intermediate compression chamber C2 and the second intermediate compression chamber C3, the fluid in the intermediate compression chambers at the same pressure can be simultaneously discharged in advance through a single auxiliary exhaust port 64 and the bypass valve 100, further improving the performance of the compressor.

[0048] In addition, the exhaust port 42 is usually disposed at the center of the end plate 44 of the fixed scroll 40. When the space defined by the inner annular wall 43 is very limited, such a centrally arranged exhaust port will interfere with the setting of the bypass valve, causing the bypass valve to at least partially extend through the main exhaust port 42. This will cause the high-pressure fluid discharged through the main exhaust port 42 to act on the valve plate of the bypass valve, which may cause the bypass valve to discharge the under-compressed fluid prematurely without undergoing compression. To solve the above problems, referring to Figure 8 , in an embodiment according to the present disclosure, the main exhaust port 42A of the fixed scroll 40A includes a first exhaust port portion 42A and a second exhaust port portion 420B that communicate with each other. The first exhaust port portion 420A is located at the center of the end plate 44 of the fixed scroll 40A and is in fluid communication with the central compression chamber C1. The second exhaust port portion 420B is radially offset from the first exhaust port portion 42A and is in fluid communication with the exhaust region defined by the inner annular wall 43. In the compressor according to the present disclosure, since the second exhaust port portion 420B located above the axial direction is offset from the first exhaust port portion 420A located at the center of the end plate below, the interference of the exhaust port 42A with the bypass valve 100 is reduced, and a larger installation space is provided for the bypass valve 100.

[0049] Although the various embodiments and variations of the present disclosure have been specifically described above, those skilled in the art should understand that the present disclosure is not limited to the above specific embodiments and variations but may include various other possible combinations and associations. Other variations and modifications can be implemented by those skilled in the art without departing from the essence and scope of the present disclosure. All such variations and modifications fall within the scope of the present disclosure. Moreover, all the components described herein can be replaced by other technically equivalent components.

Claims

1. A compression mechanism, the compression mechanism comprising: A moving scroll (50), the moving scroll including a moving scroll end plate (54) and a moving scroll wrap (56) formed on one side of the moving scroll end plate; A fixed scroll (40A), the fixed scroll including a fixed scroll end plate (44) and a fixed scroll wrap (46) formed on one side of the fixed scroll end plate, an exhaust port (42, 64) being formed in the fixed scroll end plate, the fixed scroll and the moving scroll cooperating to form a series of compression chambers therebetween; And A valve assembly (100), characterized in that the valve assembly comprises: Valve plates (120, 120A), the valve plates including an arcuate first body portion (122) and a single moving portion (124) extending from the first body portion, the moving portion including a movable end (126) capable of selectively opening or closing the exhaust port; A valve stopper (140), the valve stopper including a second body portion (142) and a limiting portion (144) extending from the second body portion, the second body portion abutting against the first body portion and the limiting portion being configured to limit the movement range of the movable end; and An annular fastener (180), the annular fastener being fixed to the fixed scroll (40A) and configured to abut against the second body portion to thereby fix the axial positions of the valve plate and the valve stopper, Wherein, the moving portion (124) extends substantially linearly from one end of the first body portion (122), and the free end of the moving portion forms the movable end (126), the free end of the moving portion being close to the imaginary outer circumference defined by the first body portion and / or close to the free end of the first body portion, and the circumferential angle corresponding to the first body portion (122) being greater than 180 degrees.

2. The compression mechanism according to claim 1, wherein, The valve assembly further includes a positioning pin (160), the positioning pin extending through the pin holes (123, 125) of the valve plate and the pin holes (143, 145) of the valve stopper and extending into the pin holes (46, 48) of the fixed scroll end plate (44) to prevent circumferential displacement of the valve plate.

3. The compression mechanism according to any one of claims 1 to 2, wherein, The exhaust port includes a main exhaust port (42) and a secondary exhaust port (64), the main exhaust port being in fluid communication with a central compression chamber (C1) in the series of compression chambers, and the secondary exhaust port being in fluid communication with an intermediate compression chamber (C2) located radially outside the central compression chamber in the series of compression chambers, the movable end (126) selectively opening or closing the secondary exhaust port (64).

4. The compression mechanism according to claim 3, wherein, The intermediate compression chamber includes a first intermediate compression chamber (C2) and a second intermediate compression chamber (C3), and a fluid passage (300) for fluid communication therebetween is provided between the first intermediate compression chamber (C2) and the second intermediate compression chamber (C3).

5. The compression mechanism according to claim 3, wherein, The fixed scroll end plate is provided with an inner annular wall (43) on a side opposite to the fixed scroll wrap, the main exhaust port and the secondary exhaust port are formed in an exhaust region defined by the inner annular wall, and the valve assembly (100) is provided radially inside the inner annular wall.

6. The compression mechanism according to claim 5, wherein, The main exhaust port (42A) includes a first main exhaust port portion (420A) and a second main exhaust port portion (420B) that communicate with each other. The first main exhaust port portion is located at the center of the fixed scroll end plate and communicates with the central compression chamber. The second main exhaust port portion is radially offset from the first main exhaust port portion and communicates with the exhaust region.

7. The compression mechanism according to any one of claims 1 to 2, wherein, The width of the first body portion (122) is smaller than the width of the moving portion (124).

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