A valve assembly and a scroll compressor including the same

Abstract

The present invention provides a valve assembly and a scroll compressor including the same, relating to the technical field of compressors, and solving the technical problems of complex capacity adjustment structure and poor reliability of the scroll compressor. The valve assembly includes a valve body, on which an exhaust flow path, a suction flow path and a medium-pressure flow path are provided and are respectively communicated with the exhaust section, the suction section and the compression section of the scroll compressor. A capacity adjustment member capable of realizing state switching through suction and exhaust pressures is arranged in the valve body; when the capacity adjustment member is in different states, the suction flow path and the medium-pressure flow path are in a communicated or disconnected state to realize the capacity adjustment of the scroll compressor during partial load operation or full load operation; the scroll compressor includes the valve assembly. The present invention realizes the connection of different pressure regions by controlling the movement of the valve core position by suction and exhaust pressures, realizes the capacity adjustment of the scroll compressor during full load operation and partial load operation, reduces the complexity of the compressor structure, and improves the operation reliability of the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a valve assembly and a scroll compressor including the same. Background Art

[0002] For a scroll compressor, at the beginning of its design, its capacity is determined according to the maximum load existing in its operation process. However, during the operation process, in some time periods, the capacity required by the compressor cannot reach the maximum value, but the compressor still operates at the maximum capacity. Thus, it will affect the overall performance of the system and cause unnecessary energy waste.

[0003] To solve this problem, traditionally, a mechanical structure is usually arranged inside the compressor. For example, for the scroll compressors disclosed in Chinese patents CN105026764B and CN106032799B, the contact and separation of the movable and static disks are controlled by a solenoid valve to achieve the capacity adjustment function. This control method of mechanically controlling the contact and separation between the movable and static disks inside the scroll compressor not only has the problem of complex structure but also has the problem of increasing the reliability risk.

[0004] Therefore, the present invention provides a valve assembly with a load reduction function and a scroll compressor including the valve assembly to achieve the adjustment of the compressor capacity and reach the purpose of variable capacity. Summary of the Invention

[0005] The purpose of the present invention is to provide a valve assembly and a scroll compressor including the valve assembly to solve the technical problems of complex capacity adjustment structure and poor reliability existing in the prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A valve assembly provided by the present invention includes a valve body arranged inside a scroll compressor. An exhaust flow path, a suction flow path, and a medium-pressure flow path respectively communicating with the exhaust section, the suction section, and the compression section of the scroll compressor are arranged on the valve body. A capacity adjustment member capable of realizing state switching through the suction and exhaust pressures is arranged inside the valve body; when the capacity adjustment member is in different states, the suction flow path and the medium-pressure flow path are in a connected or disconnected state to achieve the capacity adjustment of the scroll compressor during partial load operation or full load operation.

[0008] As a further improvement of the present invention, the capacity adjusting member has two operating states, namely a first state of full-load operation of the scroll compressor and a second state of part-load operation; when the capacity adjusting member is in the first state, the suction flow path and the medium-pressure flow path are separated from each other and kept disconnected, and all the suction refrigerant participates in the compression process; when the capacity adjusting member is in the second state, the suction flow path and the medium-pressure flow path are connected to each other and kept in communication, and part of the suction refrigerant flows back and part participates in the compression process.

[0009] As a further improvement of the present invention, the valve body includes a valve seat with one end open and a cover plate covering the open end of the valve seat; the capacity adjusting member is placed in the valve seat and is connected to the cover plate through an elastic member, and can reciprocate axially along the valve seat; an exhaust connection through-hole connected to the exhaust flow path is provided at the bottom of the valve seat, and a medium-pressure connection through-hole connected to the medium-pressure flow path is provided on the side wall; an air intake connection through-hole communicating with the air intake cavity is provided on the cover plate, and the suction flow path is arranged in the capacity adjusting member and communicates with both the side part and the head part of the capacity adjusting member. When the capacity adjusting member is in the second state, the medium-pressure connection through-hole communicates with the suction flow path. When the elastic member is in the natural elongation state, the capacity adjusting member is in contact connection with the bottom of the valve seat. When the exhaust pressure of the scroll compressor is greater than the sum of the suction pressure and the elastic force of the elastic member, the capacity adjusting member is in the first state; when the exhaust pressure of the scroll compressor is less than the sum of the suction pressure and the elastic force of the elastic member, the capacity adjusting member is in the second state.

[0010] As a further improvement of the present invention, when the exhaust pressure of the scroll compressor is greater than the suction pressure and the elastic member

[0011] As a further improvement of the present invention, the capacity adjusting member includes a valve core with the same specification and shape as the inner cavity of the valve seat, an axial through-hole provided at the head of the valve core, a radial through-hole provided at the side part of the valve core, an annular groove axially arranged on the outer wall of the valve core, and a sealing ring embedded in the annular groove to form a plurality of independent chambers between the valve seat and the outer wall of the valve core. One end of the suction flow path is connected to the axial through-hole, and the other end is connected to the radial through-hole; when the capacity adjusting member is in the first state or the second state, the medium-pressure connection through-hole communicates with different independent chambers, and the radial through-hole is located at one of the independent chambers communicating with the medium-pressure connection through-hole.

[0012] As a further improvement of the present invention, the independent chambers include three, namely a discharge pressure chamber, a medium-pressure chamber, and a suction pressure chamber. The exhaust connection through-hole communicates with the discharge pressure chamber; the air intake connection through-hole communicates with the suction pressure chamber through the suction flow path; the medium-pressure chamber is located between the suction pressure chamber and the discharge pressure chamber. When the valve core reciprocates, the medium-pressure connection through-hole communicates with the medium-pressure chamber or the suction pressure chamber.

[0013] As a further improvement of the present invention, the intervals between adjacent two of the annular grooves are equal.

[0014] As a further improvement of the present invention, when the capacitance adjusting member is in the first state, the distance H1 between the bottom of the valve core and the bottom of the valve seat is greater than the maximum distance H2 between the medium-pressure connection through hole and the suction and pressure chamber.

[0015] As a further improvement of the present invention, the exhaust flow path includes an exhaust hose and an exhaust passage. The exhaust passage is opened on the partition plate, one end is communicated with the exhaust section, and the other end is communicated with the exhaust hose.

[0016] As a further improvement of the present invention, the exhaust section is a static disk exhaust port or an exhaust cavity.

[0017] As a further improvement of the present invention, the medium-pressure flow path includes a medium-pressure hose and a medium-pressure passage. The medium-pressure passage is opened on the static disk, one end is communicated with the compression chamber of the static disk, and the other end is communicated with the medium-pressure hose.

[0018] A scroll compressor provided by the present invention includes the valve assembly.

[0019] As a further improvement of the present invention, the scroll compressor includes a housing, a partition plate, a static disk, a moving disk and a crankshaft. The valve assembly is installed on the partition plate.

[0020] The present invention has the following beneficial effects compared with the prior art:

[0021] The scroll compressor with a load reduction function provided by the present invention realizes the connection of different pressure regions by setting the movement of the valve core position controlled by the suction, discharge and pressure, so as to realize the capacity adjustment of the scroll compressor during full load operation and partial load operation. It can avoid the use of mechanical power mechanisms, reduce the complexity of the compressor structure, and improve the operation reliability of the compressor. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0023] Figure 1 It is a sectional view of the first embodiment of the valve assembly of the present invention installed on the scroll compressor;

[0024] Figure 2 It is Figure 1 The partial enlarged view of A in

[0025] Figure 3 Is Figure 1 Partial enlarged view of part B;

[0026] Figure 4 Is a schematic structural view of the cover plate in the valve assembly of the present invention;

[0027] Figure 5 Is a schematic structural view of the gasket in the valve assembly of the present invention;

[0028] Figure 6 Is a schematic structural view of the valve seat in the valve assembly of the present invention;

[0029] Figure 7 Is a schematic structural view of the sealing ring in the valve assembly of the present invention;

[0030] Figure 8 Is a schematic structural view of the spring in the valve assembly of the present invention;

[0031] Figure 9 Is a schematic structural view of the valve core in the valve assembly of the present invention;

[0032] Figure 10 Is an exploded sectional view of the valve assembly of the present invention cut along the axial direction;

[0033] Figure 11 Is a sectional view of the valve assembly of the present invention in the first state;

[0034] Figure 12 Is a sectional view of the valve assembly of the present invention in the second state;

[0035] Figure 13 Is a partial sectional view of the second embodiment of the valve assembly of the present invention installed in a scroll compressor.

[0036] In the figure: 1, static plate exhaust port; 2, partition plate; 3, valve assembly; 4, compression chamber; 5, static plate; 6, moving plate; 7, housing; 8, exhaust pipe; 9, exhaust chamber; 10, exhaust passage; 11, medium-pressure passage; 12, exhaust hose; 13, medium-pressure hose; 14, cover plate; 15, gasket; 16, valve seat; 1601, valve end face; 1602, threaded hole; 1603, valve inner wall; 17, suction connection through hole; 18, medium-pressure connection through hole; 19, exhaust connection through hole; 20, sealing ring; 21, spring; 22, valve core; 2201, annular groove; 2202, radial through hole; 2203, axial through hole; 2204, outer wall surface; 23, screw; 24, crankshaft; 25, suction chamber; 26, discharge pressure chamber; 27, medium-pressure chamber; 28, suction and pressure chamber; 29, suction air flow path. Detailed implementation manners

[0037] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other implementation manners obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope protected by the present invention.

[0038] The present invention provides a valve assembly capable of adjusting the capacity of a compressor by suction, discharge and pressure regulation. By providing this valve assembly, the compressor has a unloading function and can reduce the internal refrigerant capacity when the compressor operates at part load; specifically, the valve assembly 3 includes a valve body provided in a scroll compressor. An exhaust flow path, a suction flow path 29 and a medium-pressure flow path that are respectively communicated with the exhaust section, the suction section and the compression section of the scroll compressor are provided on the valve body. A capacity adjustment member capable of switching states through suction and discharge pressures is provided in the valve body; when the capacity adjustment member is in different states, the suction flow path 29 and the medium-pressure flow path are in a connected or disconnected state to achieve capacity adjustment of the scroll compressor during part-load operation or full-load operation.

[0039] It should be further noted that the capacity adjustment member includes two operating states, namely, a first state of full-load operation of the scroll compressor and a second state of part-load operation; when the scroll compressor is in full-load operation, its exhaust pressure is greater than the sum of the suction pressure and the elastic force of the elastic member, the capacity adjustment member is in the first state, the suction flow path 29 and the medium-pressure flow path are separated from each other and remain disconnected, and all the inhaled refrigerant participates in the compression process; when the scroll compressor is in part-load operation, its exhaust pressure is less than the sum of the suction pressure and the elastic force of the elastic member, the capacity adjustment member is in the second state, the suction flow path 29 and the medium-pressure flow path are connected to each other and remain connected, and part of the inhaled refrigerant flows back and part participates in the compression process.

[0040] As an optional implementation manner of the present invention, the valve body includes a valve seat 16 with one end open and a cover plate 14 covering the open end of the valve seat 16; the capacity adjustment member is placed in the valve seat 16 and is connected to the cover plate 14 through an elastic member and can reciprocate axially along the valve seat 16. Further, in an embodiment of the present invention, the elastic member is a spring 21; when the spring 21 is in a natural elongation state, that is, in a state of not being compressed or stretched, the capacity adjustment member is in contact connection with the bottom of the inner cavity of the valve seat 16, and this is also the second state of the capacity adjustment member; an exhaust connection through hole 19 connected to the exhaust flow path is provided at the bottom of the valve seat 16, and a medium-pressure connection through hole 18 connected to the medium-pressure flow path is provided on the side wall; a suction connection through hole 17 communicated with the suction cavity 25 is provided on the cover plate 14. The suction flow path 29 is provided in the capacity adjustment member and is communicated with both the side part and the head part of the capacity adjustment member. When the capacity adjustment member is in the second state, the medium-pressure connection through hole 18 is communicated with the suction flow path 29.

[0041] Further, the capacity adjustment member includes a valve core 22 having the same inner cavity specification and shape as the valve seat 16, an axial through hole 2203 provided at the head of the valve core 22, a radial through hole 2202 provided at the side of the valve core 22, a plurality of annular grooves 2201 axially provided on the outer wall surface 2204 of the valve core 22, and a sealing ring 20 embedded in the annular grooves 2201 to form a plurality of independent chambers between the outer walls of the valve seat 16 and the valve core 22. One end of the intake air flow path is connected to the axial through hole 2203, and the other end is connected to the radial through hole 2202. When the capacity adjustment member is in the first state or the second state, the medium-pressure connection through hole 18 communicates with different independent chambers, and the radial through hole 2202 is located at one of the independent chambers communicating with the medium-pressure connection through hole 18.

[0042] The independent chambers include three, namely an exhaust pressure chamber 26, a medium-pressure chamber 27, and a suction pressure chamber 28. The exhaust connection through hole 19 communicates with the exhaust pressure chamber 26; the intake connection through hole 17 communicates with the suction pressure chamber 28 through the intake air flow path 29; the medium-pressure chamber 27 is located between the suction pressure chamber 28 and the exhaust pressure chamber 26. When the valve core 22 reciprocates, the medium-pressure connection through hole 18 communicates with the medium-pressure chamber 27 or the suction pressure chamber 28.

[0043] As an alternative embodiment of the present invention, the intervals between adjacent annular grooves 2201 are equal.

[0044] When the capacity adjustment member is in the first state, the distance H1 between the bottom of the valve core 22 and the bottom of the valve seat 16 is greater than the maximum distance H2 between the medium-pressure connection through hole 18 and the suction pressure chamber 28. Through this structural setting, it can be ensured that when the capacity adjustment member is in the second state, the medium-pressure connection through hole 18 can communicate with the suction pressure chamber 28, so as to ensure that the medium-pressure refrigerant in the scroll compressor can flow back to the suction cavity 25 through the suction pressure chamber 28 and the intake air flow path 29, realizing capacity adjustment.

[0045] The exhaust air flow path includes an exhaust hose 12 and an exhaust passage 10. The exhaust passage 10 is opened on the partition plate 2, with one end communicating with the exhaust section and the other end communicating with the exhaust hose 12.

[0046] Further, the exhaust section is the static disk exhaust port 1 or the exhaust cavity 9.

[0047] Further, the medium-pressure flow path includes a medium-pressure hose 13 and a medium-pressure passage 11. The medium-pressure passage 11 is opened on the static disk 5, with one end communicating with the compression cavity 4 of the static disk 5 and the other end communicating with the medium-pressure hose 13.

[0048] The present invention also provides a scroll compressor, including the above valve assembly 3, and the valve assembly 3 is installed in the scroll compressor.

[0049] Furthermore, the scroll compressor includes a housing 7, a partition plate 2, a static disk 5, a moving disk 6, and a crankshaft 24, and the valve assembly 3 is installed on the partition plate 2.

[0050] Embodiment 1:

[0051] As Figure 1 shown, the present invention provides a scroll compressor, which mainly consists of components such as a partition plate 2, a stationary disk 5, a moving disk 6, a housing 7, an exhaust pipe 8, a crankshaft 24, etc. An exhaust chamber 9 is formed between the partition plate 2 and the housing 7. The stationary disk exhaust port 1 communicates with the exhaust chamber 9, and the exhaust pipe 8 is installed on the housing 7 and communicates with the exhaust chamber 9. The crankshaft 24 is drivingly connected to the moving disk 6 and can drive the moving disk 6 to rotate; an intake chamber 25 is formed between the stationary disk 5 and the housing 7; during operation, driven by the crankshaft 24, the moving disk 6 makes a swirling translational motion around the stationary disk 5, thereby forming a series of crescent-shaped compression chambers 4 between the two, realizing the compression process of gaseous refrigerant.

[0052] It further includes a valve assembly 3 arranged in the scroll compressor. As Figures 1 - 3 shown, the valve assembly 3 is assembled on the partition plate 2, and the two can be connected together by welding, bolt fixing or other means; as Figure 4 shown, screw through holes for connecting with the valve seat 16 and an intake connection through hole 17 are formed on the cover plate 14; as Figure 5 shown, it is the structure of the gasket 15. The gasket 15 is arranged between the cover plate 14 and the valve seat 16, and screw through holes are provided on the gasket 15; as Figure 6 shown, it is a schematic structural diagram of the valve seat 16. The valve seat 16 is a cylindrical barrel-shaped structure, with one end sealed and the other end open. An annular valve end face 1601 extending outward is provided at the open end of the valve seat 16. Threaded holes 1602 for connecting with bolts are provided on the valve end face 1601. A medium-pressure connection through hole 18 is formed on the valve inner wall 1603 of the valve seat 16. The valve core 22 is placed in the inner cavity of the valve seat 16, and an exhaust connection through hole 19 is formed at the bottom of the valve seat 16; as Figure 7 shown, it is a schematic structural diagram of the sealing ring 20; as Figure 8 shown, it is a schematic structural diagram of the spring 21; as Figure 9 shown, it is a schematic structural diagram of the valve core 22. A circumferential annular groove 2201 is formed on the valve core 22. Radial through holes 2202 are formed on the outer wall surface 2204, and an axial through hole 2203 is formed at the head, that is, on the side close to the cover plate 14. The radial through holes 2202 and the axial through hole 2203 are communicated through an intake flow path 29; as Figure 10 shown, it is an exploded sectional view of the valve assembly 3 cut axially; as Figure 11 shown, it is a sectional view of the valve assembly 3 in the first state; as Figure 12 shown, it is a sectional view of the valve assembly 3 in the second state.

[0053] During the assembly process of the valve assembly 3: the exhaust-pressure gaseous refrigerant led out through the exhaust passage 10 on the partition plate 2 is introduced into the exhaust connection hole 19 on the valve seat 16; the intermediate-pressure gaseous refrigerant led out through the intermediate-pressure passage 11 on the stationary disk 5 is introduced into the intermediate-pressure connection hole 18 on the valve seat 16; and the suction pressure is introduced into the suction connection hole 17 on the valve seat 16. The exhaust passage 10 on the partition plate 2 and the exhaust connection hole 19 on the valve seat 16, and the intermediate-pressure passage 11 on the stationary disk 5 and the intermediate-pressure connection hole 18 on the valve seat 16 are respectively connected together by an exhaust hose 12 and an intermediate-pressure hose 13.

[0054] The valve assembly 3 includes components such as a cover plate 14, a gasket 15, a valve seat 16, a spring 21, and a valve core 22. During the assembly process, one end of the spring 21 is connected to the cover plate 14, and the other end is connected to the valve core 22. The sealing ring 20 can be assembled in the circumferential annular groove 2201 of the valve core 22. The valve seat 16, the gasket 15, and the cover plate 14 are fixedly connected together by screws. The outer wall surface 2204 of the valve core 22, the valve inner wall 1603 of the valve seat 16, and the sealing ring 20 divide the gap space between the valve core 22 and the valve seat 16 into a suction-pressure chamber 28, an intermediate-pressure chamber 27, and a discharge-pressure chamber 26. The valve core 22 is provided with a radial through-hole 2202 and an axial through-hole 2203, which are connected through a suction gas flow path 29, and the suction pressure can be introduced into the suction-pressure chamber 28. At the same time, during the assembly process of the valve assembly 3, it is necessary to satisfy: when the capacity adjustment part is in the first state, the distance H1 between the bottom of the valve core 22 and the bottom of the valve seat 16 is greater than the maximum distance H2 between the intermediate-pressure connection hole 18 and the suction-pressure chamber 28, that is, H2 < H1, and the diameter φd of the intermediate-pressure connection hole 18 is less than the length of the suction-pressure chamber 28 or the intermediate-pressure chamber 27, that is, φd < H3 = H4.

[0055] When the compressor operates under normal working conditions, the exhaust pressure is significantly greater than the suction pressure. At this time, the valve assembly 3 is in the first state, and at this time, the compression chamber of the stationary disk 5 is not connected to the suction refrigerant, and the compressor operates at full load; when operating under partial load conditions, the force provided by the suction pressure and the spring 21 to the valve core 22 is greater than the force provided by the exhaust pressure to the valve core 22. At this time, the valve assembly 3 is in the second state, and at this time, the compression chamber of the stationary disk 5 is connected to the suction refrigerant, and part of the intermediate-pressure refrigerant in the compression chamber of the compressor leaks to the suction side of the compressor, realizing the capacity adjustment function.

[0056] Embodiment 2:

[0057] As Figure 13As shown, only the differences from Embodiment 1 will be described in this embodiment. The difference between Embodiment 2 and Embodiment 1 is only that the introduction end of the exhaust passage 10 is not the static disk exhaust port 1, but the exhaust cavity 9. In this embodiment, the exhaust passage 10 vertically penetrates through the partition plate 2 and communicates with the exhaust cavity 9 at the top and is connected to the exhaust hose 12 at the bottom. In this Embodiment 2, the exhaust refrigerant in the exhaust cavity 9 is led to the pressure discharge chamber of the valve assembly 3, and at partial load, it realizes the drive for the position transformation of the valve core.

[0058] First of all, it should be noted here that "inward" is the direction towards the center of the accommodation space, and "outward" is the direction away from the center of the accommodation space.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the Figure 1 orientation or positional relationship shown, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0060] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely means that the horizontal height of the first feature is less than that of the second feature.

[0063] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0064] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A valve assembly, characterized in that, it includes a valve body disposed in a scroll compressor, and an exhaust flow path, a suction flow path, and a medium-pressure flow path that are respectively communicated with the exhaust section, the suction section, and the compression section of the scroll compressor are provided on the valve body. A capacity adjustment member capable of switching states through suction and exhaust pressures is provided in the valve body; when the capacity adjustment member is in different states, the suction flow path and the medium-pressure flow path are in a connected or disconnected state to achieve capacity adjustment of the scroll compressor during partial load operation or full load operation; the capacity adjustment member includes two operating states, namely a first state of full load operation of the scroll compressor and a second state of partial load operation; when the capacity adjustment member is in the first state, the suction flow path and the medium-pressure flow path are separated from each other and kept disconnected, and all the inhaled refrigerant participates in the compression process; when the capacity adjustment member is in the second state, the suction flow path and the medium-pressure flow path are connected to each other and kept connected, and part of the inhaled refrigerant flows back, and part participates in the compression process; the valve body includes a valve seat with one end open and a cover plate covering the open end of the valve seat; the capacity adjustment member is placed in the valve seat and is connected to the cover plate through an elastic member and can reciprocate axially along the valve seat; an exhaust connection through hole connected to the exhaust flow path is provided at the bottom of the valve seat, and a medium-pressure connection through hole connected to the medium-pressure flow path is provided on the side wall; an intake connection through hole communicating with the intake cavity is provided on the cover plate, and the intake flow path is provided in the capacity adjustment member and is communicated with both the side part and the head part of the capacity adjustment member. When the capacity adjustment member is in the second state, the medium-pressure connection through hole is communicated with the intake flow path.

2. The valve assembly according to claim 1, characterized in that, the capacity adjustment member includes a valve core with the same specification and shape as the inner cavity of the valve seat, an axial through hole provided at the head of the valve core, a radial through hole provided at the side part of the valve core, an annular groove provided axially on the outer wall of the valve core, and a sealing ring embedded in the annular groove to form a plurality of independent chambers between the valve seat and the outer wall of the valve core. One end of the intake flow path is connected to the axial through hole, and the other end is connected to the radial through hole; when the capacity adjustment member is in the first state or the second state, the medium-pressure connection through hole communicates with different independent chambers, and the radial through hole is located at one of the independent chambers communicated with the medium-pressure connection through hole.

3. The valve assembly according to claim 2, characterized in that, the independent chambers include three, namely a discharge pressure chamber, a medium-pressure chamber, and a suction pressure chamber. The exhaust connection through hole communicates with the discharge pressure chamber; the intake connection through hole communicates with the suction pressure chamber through the intake flow path; the medium-pressure chamber is located between the suction pressure chamber and the discharge pressure chamber. When the valve core reciprocates, the medium-pressure connection through hole communicates with the medium-pressure chamber or the suction pressure chamber.

4. The valve assembly according to claim 2, characterized in that, the intervals between adjacent two of the annular grooves are equal.

5. The valve assembly according to claim 3, characterized in that, When the capacity regulating member is in the first state, the distance H1 between the bottom of the valve core and the bottom of the valve seat is greater than the maximum distance H2 between the medium-pressure connection through hole and the suction and pressure chamber.

6. The valve assembly according to claim 1, wherein, the exhaust flow path includes an exhaust hose and an exhaust passage, the exhaust passage is formed on the partition plate, one end is communicated with the exhaust section, and the other end is communicated with the exhaust hose.

7. The valve assembly according to claim 6, wherein, the exhaust section is a static plate exhaust port or an exhaust cavity.

8. The valve assembly according to claim 1, wherein, the medium-pressure flow path includes a medium-pressure hose and a medium-pressure passage, the medium-pressure passage is formed on the static plate, one end is communicated with the compression chamber of the static plate, and the other end is communicated with the medium-pressure hose.

9. A scroll compressor, wherein, it includes the valve assembly according to any one of claims 1-8.

10. The scroll compressor according to claim 9, wherein, the scroll compressor includes a housing, a partition plate, a static plate, a moving plate and a crankshaft, and the valve assembly is installed on the partition plate.

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