Scroll compressor

Abstract

The present application relates to a scroll compressor, which comprises a partition plate, a compression mechanism, a capacity adjusting device and a sealing assembly. The sealing assembly separates a back pressure cavity from a high pressure space and a low pressure space, and forms a first sealing part between the sealing assembly and the partition plate, and a sealing surface of the first sealing part is a flexible sealing surface. The capacity adjusting device is provided with a variable pressure chamber and is configured to establish or interrupt the communication between a first compression cavity and the low pressure space by changing the pressure in the variable pressure chamber. The scroll compressor according to the present application can balance the requirements of different load conditions on the pressure in the back pressure cavity of the compressor, can reduce the axial force on the compression mechanism while reliably isolating the back pressure cavity from the high pressure space and the low pressure space, can reduce the power consumption of the scroll compressor, improve the system performance, and reduce the manufacturing cost.

Description

TECHNICAL FIELD

[0001] The present application relates to a scroll compressor. BACKGROUND

[0002] The contents of this section merely provide background information related to the present application and can not constitute the prior art.

[0003] During the operation of the scroll compressor, working fluid (e.g., refrigerant gas) enters the scroll compressor through the suction pipe of the scroll compressor, and enters the compression chamber of the compression mechanism along with the movement of the compression mechanism, and is discharged from the scroll compressor after being compressed by the compression mechanism. In order to better adapt to different terminal load requirements, the scroll compressor is provided with a capacity adjustment function. At present, the capacity adjustment technology of the scroll compressor mainly includes mechanical bypass capacity adjustment technology and variable frequency adjustment technology. The mechanical bypass capacity adjustment technology realizes the capacity adjustment of the scroll compressor by opening or blocking the bypass passage arranged in the compression mechanism, and has the characteristics of low system cost and high reliability, so it is widely used. Under various load operating conditions (e.g., part load operating condition and full load operating condition), the high pressure area, the medium pressure area and the low pressure area in the compression mechanism need to be reliably isolated to enable the scroll compressor to operate effectively.

[0004] In a scroll compressor applying the mechanical bypass capacity adjustment technology, the high pressure area, the medium pressure area and the low pressure area are isolated by arranging a sealing assembly in the compression mechanism, and the bypass passage is opened or blocked by adjusting the force acting on the moving member to make the moving member move along the axial direction of the compression mechanism, so as to realize the capacity adjustment of the scroll compressor. For this scroll compressor, the sealing assembly and the moving member need to be reasonably designed to balance the requirements of different load operating conditions, so as to further reduce the power consumption of the scroll compressor and improve the performance of the scroll compressor. SUMMARY

[0005] An object of the present application is to solve at least one of the above problems.

[0006] One aspect of the present application is to provide a scroll compressor, comprising: a partition plate dividing a space in the scroll compressor into a high-pressure space and a low-pressure space; a compression mechanism including a fixed scroll and an orbiting scroll, the fixed scroll and the orbiting scroll cooperating with each other to define a series of compression chambers; a capacity adjustment device including a bypass passage, the bypass passage extending through an end plate of the fixed scroll such that a first end of the bypass passage is open to a first side of the end plate of the fixed scroll to communicate with a first compression chamber of the series of compression chambers, and a second end of the bypass passage is open to an opposite second side of the end plate of the fixed scroll and selectively communicates with the low-pressure space, the adjustment member being configured to be movable relative to the fixed scroll in an axial direction to establish or interrupt the communication between the first compression chamber and the low-pressure space; a back pressure chamber formed between the fixed scroll and the partition plate and communicating with a second compression chamber of the series of compression chambers via a back pressure passage; and a seal assembly isolating the back pressure chamber from the high-pressure space and the low-pressure space. A first seal portion is formed between the seal assembly and the partition plate, a sealing surface of the first seal portion is a flexible sealing surface, the capacity adjustment device is provided with a variable pressure chamber and configured to move the adjustment member relative to the fixed scroll in the axial direction by changing the pressure in the variable pressure chamber.

[0007] In one embodiment, at the first seal portion, the flexible first seal of the seal assembly is compressed by the first mounting member against the partition plate.

[0008] The fixed scroll is formed with a cylindrical portion extending axially from the second side of the end plate, the cylindrical portion being formed with an outer shoulder portion. The second end of the bypass passage is located radially outward of the cylindrical portion, the first end of the back pressure passage is open to the first side of the end plate of the fixed scroll to communicate with the second compression chamber, and the second end of the back pressure passage is open to the outer shoulder portion. The adjustment member is an annular member, the adjustment member is sealingly engaged with the cylindrical portion, and the adjustment member is movable relative to the cylindrical portion in the axial direction. The back pressure chamber is defined jointly by the cylindrical portion, the partition plate, and the adjustment member.

[0009] In one embodiment, a second seal portion is further formed between the seal assembly and the partition plate, the second seal portion being located radially outward of the first seal portion. At the second seal portion, a flexible second seal of the seal assembly is compressed by a second mounting member against the partition plate.

[0010] The second seal is compressed between an end portion of the second mounting member and the partition plate, and at least a portion of the second seal is in sealing contact with the adjustment member. An axial spacing between the end portion of the second mounting member and the partition plate is d1, and an axial spacing between an end portion of the adjustment member and the partition plate is d2, preferably, d1>0.7d2.

[0011] The second mounting member is mounted on the outer shoulder portion, and the second end of the back pressure passage is always in communication with the back pressure cavity. In one embodiment, the second mounting member is mounted on the outer shoulder portion via an annular retaining member, and the annular retaining member is provided with a notch extending radially inward from the outer periphery of the annular retaining member, the notch facing the second end of the back pressure passage.

[0012] The cylindrical portion is further formed with an inner shoulder portion, and the first mounting member is mounted on the inner shoulder portion such that the first sealing portion is located radially inward of the cylindrical portion.

[0013] In one embodiment, the sealing assembly further comprises annular second and third sealing members, and second and third mounting members coupled to each other. The second and third sealing members are sandwiched between the second and third mounting members, and the inner periphery of the second sealing member forms a second sealing portion with the outer peripheral wall of the cylindrical portion, and the outer periphery of the third sealing member forms a third sealing portion with the inner peripheral wall of the adjusting member.

[0014] The second mounting member is provided with an annular flange extending radially inward from the inner wall of the second mounting member, and the first mounting member is mounted on the annular flange.

[0015] In one embodiment, the variable pressure chamber is controlled by an electromagnetic switching valve to selectively communicate with the low pressure space or the back pressure cavity.

[0016] When the variable pressure chamber is controlled to communicate with the low pressure space, the adjusting member shields the second end of the bypass passage to interrupt the communication between the first compression cavity and the low pressure space, so that the scroll compressor operates in full load condition. When the variable pressure chamber is controlled to communicate with the back pressure cavity, the adjusting member opens the second end of the bypass passage to establish the communication between the first compression cavity and the low pressure space, so that the scroll compressor operates in partial load condition.

[0017] The present application provides an improved scroll compressor, which can balance the requirements of different load conditions on the pressure in the back pressure cavity of the compressor, can reduce the axial force on the compression mechanism while reliably isolating the back pressure cavity from the high pressure space and the low pressure space, so as to reduce the power consumption of the scroll compressor, improve the system performance, and reduce the manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] Embodiments of the present application will be described below by way of example only, with reference to the accompanying drawings. In the drawings, like features or components are denoted by like reference numerals, and the drawings are not necessarily to scale, and in which:

[0019] Figure 1 A cross-sectional view of a scroll compressor of a comparative example is shown;

[0020] Figure 2 is Figure 1partial enlarged view of FIG. 1, showing a part of the compression mechanism, the seal assembly, and the capacity regulating device of the scroll compressor under a full load condition;

[0021] Figure 3 is Figure 1 partial sectional view of FIG. 2, showing a part of the compression mechanism, the seal assembly, and the capacity regulating device of the scroll compressor under a partial load condition;

[0022] Figure 4 shows Figure 1 plan view of the fixed scroll of the scroll compressor of FIG. 3;

[0023] Figure 5 shows a partial sectional view of a scroll compressor according to a first embodiment of the present application;

[0024] Figure 6 is Figure 5 partial enlarged view of FIG. 1, showing a part of the compression mechanism, the seal assembly, and the capacity regulating device of the scroll compressor under a full load condition;

[0025] Figure 7 is Figure 5 partial sectional view of FIG. 2, showing a part of the compression mechanism, the seal assembly, and the capacity regulating device of the scroll compressor under a partial load condition;

[0026] Figure 8 shows Figure 5 plan view of the fixed scroll of the scroll compressor of FIG. 3;

[0027] Figure 9 is Figure 5 partial enlarged view of FIG. 1, showing a part of the compression mechanism, the seal assembly, and the capacity regulating device of the scroll compressor under a full load condition;

[0028] Figure 10 shows Figure 5 plan view of the annular retainer of the seal assembly of the scroll compressor of FIG. 4;

[0029] Figure 11 shows a perspective view of the compression mechanism in which the electromagnetic switching valve is installed;

[0030] Figure 12 shows a sectional view taken along the section line I-I of FIG. 5; Figure 11

[0031] and Figure 13 shows a plan view of the electromagnetic switching valve of FIG. 6 from a different angle; Figure 14 Figure 11

[0032] Figure 15 ​​A cross-sectional view of a scroll compressor according to a second embodiment of the present application is shown; and

[0033] Figure 16 A cross-sectional view of a sealing assembly of a scroll compressor in Figure 15 is shown. DETAILED DESCRIPTION

[0034] The following description is merely exemplary in nature and is not intended to limit the present application, application, and uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or similar elements and features. The various embodiments of the present application are illustrated schematically in the figures, and the specific dimensions and ratios relating to the various embodiments are not intended to limit the scope of the present application but are for the purpose of illustration only. Certain portions of the figures can be exaggerated to illustrate details of the present application.

[0035] In the description of the embodiments of the present application, the orientation terms related to "upper", "lower", "left", "right" are described with the upper, lower, left, right positions of the view shown in the drawings. In the actual application of the scroll compressor, the positions of "upper", "lower", "left", "right" used herein can be defined according to the actual situation, and these relationships can be reversed.

[0036] Figure 1 A cross-sectional view of a scroll compressor 1 of a comparative example is shown. As Figure 1 shown, the scroll compressor 1 includes a housing assembly 10 and a compression mechanism 20, a partition plate 30 (e.g., a soundproof plate) housed in the housing assembly 10. The housing assembly 10 includes a top cover 11, a housing 12, and a base 13, which are sealingly coupled to each other to define a sealed space within the housing assembly 10. The partition plate 30 divides the space within the housing assembly 10 of the scroll compressor 1 into a high-pressure space VH and a low-pressure space VL. Specifically, the top cover 11 is sealingly mounted to an upper end of the housing 12, and the partition plate 30 is mounted above the compression mechanism 20 and sealingly mounted to an inner wall (an inner circumferential wall of the top cover 11 or an inner circumferential wall of the housing 12 or both) of the housing assembly 10, thereby defining the high-pressure space VH within the housing assembly 10 of the scroll compressor 1 between the top cover 11 and the partition plate 30, and defining the low-pressure space VL within the housing assembly 10 below the partition plate 30.

[0037] The compression mechanism 20 includes a fixed scroll 21 and an orbiting scroll 23. The fixed scroll 21 includes vanes 212 extending from an end plate 211 toward a first side (lower side in Figure 1 Figure 1 ​A cylindrical portion 213 extending from the upper side of the cylindrical portion 23. The radial dimension of the upper end of the cylindrical portion 213 is set to be smaller than the radial dimension of the rest of the cylindrical portion 213, thereby forming an outer shoulder portion 2131 at the upper end of the cylindrical portion 23 (see...). Figure 2 and Figure 3 The fixed scroll plate 21 has an exhaust port 214 at its center, which penetrates the end plate 211 and the cylindrical portion 213. The exhaust port 214 is configured to have a smaller diameter in the end plate 211 and a larger diameter in the cylindrical portion 213. The moving scroll plate 23 includes a portion extending from its end plate 231 towards one side (…). Figure 1 The blades 232 extend from the upper side of the scroll compressor 23. The moving scroll 23 is adapted to translate relative to the fixed scroll 21, such that the blades 232 of the moving scroll 23 cooperate with the blades 212 of the fixed scroll 21 to define a series of compression chambers between the moving scroll 23 and the fixed scroll 21. During the operation of the scroll compressor 1, as the compression mechanism 20 compresses, the working fluid (e.g., refrigerant gas) enters the housing assembly 10 from the inlet port 14 of the scroll compressor 1 and enters the compression chambers within the compression mechanism 20. The compressed working fluid (e.g., high-pressure refrigerant gas) exits the compression mechanism 20 from the outlet port 214 of the fixed scroll 21, enters the high-pressure space VH within the housing assembly 10 of the scroll compressor 1, and exits the scroll compressor 1 through the outlet port 15.

[0038] The scroll compressor 1 is also equipped with a capacity adjustment device M. This capacity adjustment device M includes a bypass channel 41, an annular adjustment member 42, and a mounting member 43. The bypass channel 41 is formed within the fixed scroll plate 21, penetrates the end plate 211 of the fixed scroll plate 21, and the first end of the bypass channel 41 ( Figure 1 The lower end of the vortex disk 21 opens onto the second side (lower side) of the end plate 211 of the fixed vortex disk 21 to communicate with the first compression chamber (e.g., the first intermediate pressure chamber) C1 of the series of compression chambers of the compression mechanism 20 with a pressure of P1, and the second end of the bypass channel 41 ( Figure 1 The upper end of the bypass channel 41 opens onto the first side of the end plate 211 of the fixed scroll plate 21 and selectively communicates with the low-pressure space VL. The mounting member 43 is installed to the fixed scroll plate 21. The adjusting member 42 is sealed to the fixed scroll plate 21 and the mounting member 43 and is configured to move relative to the fixed scroll plate 21 and the mounting member 43 in the axial direction O of the compression mechanism 20 to selectively open or block the second end of the bypass channel 41, establish or interrupt the communication between the first compression chamber C1 and the low-pressure space VL, thereby realizing the capacity adjustment of the scroll compressor 1.

[0039] Figure 2 and Figure 3 It shows Figure 1FIG. 6 is a partial cross-sectional view of the scroll compressor 1 in the bypass mode, showing the capacity modulation device and the seal assembly S of the scroll compressor 1 under different load conditions. The annular adjustment member 42 includes a first portion 421 and a second portion 422 surrounding the first portion 421. The first portion 421 has a flat bottom surface. The first portion 421 is positioned directly above the bypass passage 41, and the seal ring 44 is mounted on the first portion 421 by the fixing member 45. The seal ring 44 is sandwiched between the fixing member 45 and the first portion 421, and the radially inner edge of the seal ring 44 sealingly engages with the outer peripheral wall of the cylindrical portion 213 of the fixed scroll plate 21 to provide a seal between the space above the first portion 421 and the space below. The adjustment member 42 is movable in the axial direction O relative to the cylindrical portion 213, such that the first portion 421 selectively opens or blocks the second end of the bypass passage 41. The second portion 422 extends upward in the axial direction O and radially outward from the outer periphery of the first portion 421, thereby forming an opening between the outer peripheral wall of the cylindrical portion 213 and the second portion 422 toward the first annular recess of the partition plate 30, and forming an opening in the second portion 422 toward the second annular recess of the end plate 211 of the fixed scroll plate 21. The lower end of the first annular recess is sealed by the sealing engagement of the seal ring 44 with the outer peripheral wall of the cylindrical portion 213 of the fixed scroll plate 21. The seal assembly S is mounted in the first annular recess with the lower end sealed, providing a seal between the partition plate 30, the fixed scroll plate 21, and the adjustment member 42, thereby forming a back pressure cavity B in the first annular recess. The seal assembly S includes a first seal 51, a second seal 52, a third seal 53, and a first mounting member 54, the first seal 51 and the first mounting member 54 being engaged with each other (e.g., riveted) and sandwiching the second seal 52 and the third seal 53 therebetween. The upper end of the first seal 51 abuts against the partition plate 30 to form a first sealing portion, thereby isolating the high-pressure space VH from the low-pressure space VL within the scroll compressor 1. The inner periphery of the second seal 52 abuts against the cylindrical portion 213 of the fixed scroll plate 21 to form a second sealing portion, and the outer periphery of the third seal 53 abuts against the second portion 422 of the adjustment member 42 to form a third sealing portion, thereby forming the back pressure cavity B in the first annular recess between the outer peripheral wall of the cylindrical portion 213 and the second portion 422, which communicates with a back pressure passage (not shown) formed in the fixed scroll plate 21. A first end (lower end) 216 (shown only in FIG. 6) of the back pressure passage communicates with a second compression chamber (e.g., a second medium-pressure chamber) of the series of compression chambers of the compression mechanism 20 at a pressure P2, thereby providing the back pressure cavity B with a back pressure pressure (i.e., pressure P2). Figure 4 The second portion 422 of the adjustment member 42 is movable in the axial direction O relative to the cylindrical portion 213 of the fixed scroll plate 21, such that the second portion 422 selectively opens or blocks the second annular recess of the end plate 211 of the fixed scroll plate 21. The second portion 422 of the adjustment member 42 is movable in the axial direction O relative to the cylindrical portion 213 of the fixed scroll plate 21, such that the second portion 422 selectively opens or blocks the second annular recess of the end plate 211 of the fixed scroll plate 21. The second portion 422 of the adjustment member 42 is movable in the axial direction O relative to the cylindrical portion 213 of the fixed scroll plate 21, such that the second portion 422 selectively opens or blocks the second annular recess of the end plate 211 of the fixed scroll plate 21. Figure 4A plan view of the fixed scroll 21 of the scroll compressor 1 is shown from the blade 212 side of the fixed scroll 21, showing the first end 216 of the back pressure passage and the first end 411 of the bypass passage 41. In order to prevent the back pressure passage from being obscured by the first portion 421 of the adjusting member 42, the back pressure passage is formed at least partially in the cylindrical portion 213 of the fixed scroll 21 such that a second end (upper end, not shown) of the back pressure passage is exposed from the outer shoulder portion 2131 of the cylindrical portion 213.

[0040] The mounting member 43 is sealingly mounted within the second annular recess in the second portion 422 of the adjusting member 42 and on the end plate 211 of the fixed scroll 21, and an annular seal 46 is mounted on the mounting member 43, the annular seal 46 abutting against the sidewall of the second annular recess, thereby forming an annular variable pressure chamber D within the second annular recess. The annular variable pressure chamber D can be selectively communicated with the low pressure space VL or the back pressure cavity B within the compression mechanism 20 to vary the pressure P3 in the variable pressure chamber D. When the variable pressure chamber D is communicated with the low pressure space VL, the pressure P3 in the variable pressure chamber D is the lower intake pressure, such that the resultant of the upward forces acting on the adjusting member 42 is not sufficient to overcome the resultant of the downward forces acting on the adjusting member 42, the adjusting member 42 moves downwardly such that the first portion 421 of the adjusting member 42 rests on the surface of the end plate 211 of the fixed scroll 21, thereby obstructing the bypass passage 41, as shown. At this time, the communication between the first compression cavity C1 and the low pressure space VL is interrupted, and the scroll compressor 1 operates in a full load condition. The resultant of the upward forces acting on the adjusting member 42 includes the upward force of the bypass passage 41 on the adjusting member 42, the upward force of the low pressure space VL on the adjusting member 42, and the upward force of the variable pressure chamber D on the adjusting member 42. The resultant of the downward forces acting on the adjusting member 42 includes the gravitational force of the adjusting member 42 itself, the downward force of the low pressure space VL on the adjusting member 42, and the downward force of the back pressure cavity B on the adjusting member 42. When the variable pressure chamber D is communicated with the back pressure cavity B, the pressure P3 in the variable pressure chamber D is the back pressure pressure (pressure P2) in the back pressure cavity B, the resultant of the upward forces acting on the adjusting member 42 is able to overcome the resultant of the downward forces acting on the adjusting member 42, the adjusting member 42 moves upwardly relative to the fixed scroll 21 and the mounting member 43 and the annular seal 46 in the axial direction O away from the end plate 211 of the fixed scroll 21 to open the bypass passage 41, as shown. At this time, the first compression cavity C1 is communicated with the low pressure space VL, and the scroll compressor 1 operates in a partial load condition. Figure 2 Figure 3

[0041] ​​In the scroll compressor 1, the sealing assembly S is designed as a floating sealing ring, and the first sealing part between the sealing assembly S and the partition plate 30 is a metal contact surface. In the operation of the scroll compressor 1, in order to reliably isolate the high-pressure space VH from the low-pressure space VL, the contact force of the first sealing part needs to be set to be relatively large. In the partial load working condition, in order to provide reliable sealing at the first sealing part between the first sealing member 51 and the partition plate 30 to isolate the high-pressure space VH from the low-pressure space VL, it is often necessary to set the back pressure (pressure P2) in the back pressure cavity B to be relatively high, and therefore it is necessary to set the first end 216 of the back pressure passage in communication with the back pressure cavity B to be closer to the central region of the blade 212 of the fixed scroll plate 21, as shown in Figure 4 However, when the scroll compressor 1 is operated in the full load working condition, it is often desirable to have a lower back pressure (pressure P2) in the back pressure cavity B to reduce the axial force of the compression mechanism 20, thereby reducing the power consumption of the scroll compressor 1 and ensuring system performance. Therefore, the requirements for the pressure in the back pressure cavity B of the scroll compressor 1 are significantly different between the partial load working condition and the full load working condition. In addition, since the first sealing part between the first sealing member 51 and the partition plate 30 isolates the high-pressure space VH from the low-pressure space VL, the pressure difference on both sides of the sealing part is large, which further requires the back pressure (pressure P2) in the back pressure cavity B to be set to be relatively high, further expanding the difference in the requirements for the back pressure (pressure P2) in the back pressure cavity B under different load working conditions. In addition, the manufacturing and processing requirements of each component of the above sealing assembly S are also relatively strict, and the cost is relatively high. Moreover, the metal sealing surface is prone to rust.

[0042] Therefore, it is necessary to improve the sealing assembly and the capacity adjusting device of the scroll compressor to balance the requirements for the pressure in the back pressure cavity under different working conditions, to reduce the axial force of the scroll compressor as much as possible under the condition of ensuring sealing, to reduce the power consumption of the compressor, to improve the system performance, and to reduce the manufacturing cost.

[0043] In view of the above problems, the present inventors have proposed an improved scroll compressor, which advantageously alleviates the difference between the requirements for the pressure in the back pressure cavity under different load working conditions by reasonably designing the capacity adjusting device and the sealing assembly provided between the capacity adjusting device and the fixed scroll plate and the partition plate, can reduce the axial force of the scroll compressor under the full load working condition while ensuring reliable sealing, reduce the power consumption of the compressor, improve the system performance, and reduce the manufacturing cost. The scroll compressor according to the present application will be described below with reference to the accompanying drawings.

[0044] Figures 5 to 7 A partial cross-sectional view of a scroll compressor 100 according to a first embodiment of the present application is shown, wherein, Figure 6 and Figure 7The compression mechanism 20, the partition plate 30, the capacity adjusting device M1 of the scroll compressor 100, and the sealing assembly S1 installed between these components are shown in different load conditions, respectively. The scroll compressor 100 according to the first embodiment of the present application differs from the scroll compressor 1 of the comparative example in the design of the capacity adjusting device and the sealing assembly, and is generally the same in other aspects. In the drawings, the same elements as those of the scroll compressor 1 of the comparative example are denoted by the same reference numerals, and the description thereof will not be repeated. Hereinafter, only the differences between the scroll compressor 100 according to the first embodiment of the present application and the scroll compressor 1 of the comparative example will be described.

[0045] As shown in FIG. 1, the scroll compressor 100 according to the first embodiment of the present application includes a compression mechanism 20, a partition plate 30, a capacity adjusting device M1, and a sealing assembly S1 installed between these components. Figures 5 to 7 The capacity adjusting device M1 of the scroll compressor 100 includes a bypass passage 71, an annular adjusting member 72, and a mounting member 73. The bypass passage 71 is formed in the fixed scroll plate 21, penetrates the end plate 211 of the fixed scroll plate 21, and has a first end (lower end in FIG. 1) 711 opening to the first side (lower side in the drawing) of the end plate 211 of the fixed scroll plate 21 to communicate with a first compression chamber (e.g., a first intermediate-pressure chamber) C1 having a pressure of P1 among a series of compression chambers of the compression mechanism 20, and a second end (upper end in FIG. 1) 712 opening to the second side (upper side in the drawing) of the end plate 211 of the fixed scroll plate 21 to communicate with a second compression chamber (e.g., a second intermediate-pressure chamber) C2 having a pressure of P2 among the series of compression chambers of the compression mechanism 20. Figures 5 to 7 The bypass passage 71 is formed in the fixed scroll plate 21, penetrates the end plate 211 of the fixed scroll plate 21, and has a first end (lower end in FIG. 1) 711 opening to the first side (lower side in the drawing) of the end plate 211 of the fixed scroll plate 21 to communicate with a first compression chamber (e.g., a first intermediate-pressure chamber) C1 having a pressure of P1 among a series of compression chambers of the compression mechanism 20, and a second end (upper end in FIG. 1) 712 opening to the second side (upper side in the drawing) of the end plate 211 of the fixed scroll plate 21 to communicate with a second compression chamber (e.g., a second intermediate-pressure chamber) C2 having a pressure of P2 among the series of compression chambers of the compression mechanism 20. Figures 5 to 7The bypass passage 71 opens at the second side (upper side in the drawing) of the end plate 211 of the fixed scroll 21 (upper end in the drawing) and selectively communicates with the low-pressure space VL within the scroll compressor 100. The first portion 721 of the adjustment member 72 is located directly above the second end of the bypass passage 71, and the seal ring 74 is mounted on the first portion 721 via the fixing member 75. The seal ring 74 is sandwiched between the fixing member 75 and the first portion 721, and the radially inner edge of the seal ring 74 is sealingly engaged with the outer peripheral wall of the cylindrical portion 213 of the fixed scroll 21 to provide a seal between the space above the first portion 721 and the space below. The adjustment member 72 is movable in the axial direction with respect to the cylindrical portion 213 of the fixed scroll 21, so that the first portion 721 selectively opens or blocks the second end of the bypass passage 71. The second portion 722 of the adjustment member 72 extends radially outward from the outer periphery of the first portion 721 and axially upward, forming an opening toward the first annular recess of the partition 30 between the outer peripheral wall of the cylindrical portion 213 of the fixed scroll 21 and the second portion 722 of the adjustment member 72, and forming an opening toward the second annular recess of the end plate 211 of the fixed scroll 21 in the second portion 722. The lower end of the first annular recess is sealed by the sealing engagement of the seal ring 74 with the outer peripheral wall of the cylindrical portion 213 of the fixed scroll 21. However, the present application is not limited thereto, and in other examples of the present application, a seal can be provided between the radially inner end surface of the first portion 721 of the adjustment member 72 and the outer peripheral wall of the cylindrical portion 213 of the fixed scroll 21, for example, an annular groove is provided in the radially inner end surface of the first portion 721 of the adjustment member 72 and an annular seal is provided in the annular groove, so that the radially inner end surface of the first portion 721 of the adjustment member 72 is sealingly engaged with the outer peripheral wall of the cylindrical portion 213 of the fixed scroll 21, in the case where the first portion 721 of the adjustment member 72 has sufficient thickness.

[0046] The sealing assembly S1 is installed in the first annular recess sealed at the lower end, and provides sealing between the partition plate 30, the fixed scroll 21 and the adjusting member 72, so as to form the back pressure cavity B1 in the first annular recess. The sealing assembly S1 adopts a flat-top sealing ring design, and includes a first sealing member 61, a second sealing member 62, a first mounting member 63 and a second mounting member 64. The first sealing member 61 and the second sealing member 62 are both flexible sealing members, and the first mounting member 63 and the second mounting member 64 are both compression springs. The first sealing member 61 is installed between the cylindrical portion 213 of the fixed scroll 21 and the partition plate 30, the first mounting member 63 abuts the first sealing member 61 against the partition plate 30 to form a first sealing portion, and at least a portion of the first sealing member 61 abuts against the inner wall of the cylindrical portion 213. The upper end of the cylindrical portion 213 of the fixed scroll 21 further forms an inner shoulder portion 2132, and the first mounting member 63 is installed on the inner shoulder portion 2132, so that the first sealing portion between the first sealing member 61 and the partition plate 30 is located radially inward of the cylindrical portion 213. The second sealing member 62 is installed between the partition plate 30 and the adjusting member 72, the second mounting member 64 abuts the second sealing member 62 against the partition plate 30 to form a second sealing portion, the second sealing portion is located radially outward of the first sealing portion, and at least a portion of the second sealing member 62 abuts against the second portion 722 of the adjusting member 72, so as to form the back pressure cavity B1 in the first annular recess between the outer peripheral wall of the cylindrical portion 213 of the fixed scroll 21 and the second portion 722 of the adjusting member 72. The back pressure cavity B1 communicates with the second compression cavity (for example, the second medium-pressure cavity) C2 of the series of compression cavities of the compression mechanism 20 through the back pressure passage 215 formed in the fixed scroll 21. The first end (lower end) 2152 of the back pressure passage 215 is exposed from the lower surface of the end plate 211 of the fixed scroll 21 and communicates with the second compression cavity C2, and the second end (upper end) 2151 of the back pressure passage 215 is exposed from the outer shoulder portion 2131 of the cylindrical portion 213 of the fixed scroll 21. Figure 8 A plan view of the fixed scroll 21 of the scroll compressor 100 is shown from the blade 212 side of the fixed scroll 21, showing the first end 2152 of the back pressure passage 215 and the first end 711 of the bypass passage 71.

[0047] The mounting piece 73 is sealingly mounted in the second annular recess of the second portion 722 of the adjusting member 72 and on the end plate 211 of the fixed scroll 21, and an annular seal 76 is mounted on the mounting piece 73, abutting against the sidewall of the second annular recess, thereby defining an annular variable pressure chamber D1 within the second annular recess. The variable pressure chamber D1 selectively communicates with the low-pressure space VL within the compression mechanism 20, or with the back pressure cavity B1, to vary the pressure P3 in the variable pressure chamber D1. When the variable pressure chamber D1 communicates with the low-pressure space VL, the pressure P3 in the variable pressure chamber D1 is the lower intake pressure, the resultant of the upward forces acting on the adjusting member 72 is insufficient to overcome the resultant of the downward forces acting on the adjusting member 72, the adjusting member 72 moves downward in the axial direction relative to the fixed scroll 21 and the mounting piece 73 and the annular seal 76 to rest on the surface of the end plate 211 of the fixed scroll 21, thereby blocking the bypass passage 71, as shown in Figure 6 . At this time, the communication between the first compression cavity C1 and the low-pressure space VL is interrupted, and the scroll compressor 100 operates in the full load condition. The resultant of the upward forces acting on the adjusting member 72 includes the upward force of the bypass passage 71 on the adjusting member 72, the upward force of the low-pressure space VL on the adjusting member 72, and the upward force of the variable pressure chamber D1 on the adjusting member 72. The resultant of the downward forces acting on the adjusting member 72 includes the gravity of the adjusting member 72 itself, the downward force of the low-pressure space VL on the adjusting member 72, and the downward force of the back pressure cavity B1 on the adjusting member 72. When the variable pressure chamber D1 communicates with the back pressure cavity B1, the pressure P3 in the variable pressure chamber D1 is the back pressure pressure (pressure P2) in the back pressure cavity B1, the resultant of the upward forces acting on the adjusting member 72 can overcome the resultant of the downward forces acting on the adjusting member 72, the adjusting member 72 moves upward in the axial direction relative to the fixed scroll 21 and the mounting piece 73 away from the end plate 211 of the fixed scroll 21 to open the bypass passage 71, as shown in Figure 7 . At this time, the first compression cavity C1 communicates with the low-pressure space VL, and the scroll compressor 1 operates in the partial load condition.

[0048] Figure 9 A partial enlarged view of Figure 7 is shown, showing the mounting between the second seal 62 of the sealing assembly S1 and the partition plate 30 and the adjusting member 72. As Figure 9As shown, the second mounting member 64 abuts the second seal member 62 against the partition plate 30 and the second portion 722 of the adjustment member 72. The second seal member 62 is compressed between the top of the second mounting member 64 and the partition plate 30, and at least a portion of the second seal member 62 is in sealing contact with the second portion of the adjustment member 72. The axial spacing between the top of the second mounting member 64 and the partition plate 30 (i.e., the thickness of the second seal member 62 in the compressed state) is d1, and the axial spacing between the top of the second portion 722 of the adjustment member 72 and the partition plate 30 is d2. In order to prevent the second seal member 62 from being blown out of the back pressure cavity B1, d1 and d2 are designed to satisfy the following relationship: d1 > 0.7d2. In addition, the thickness of the second seal member 62 in the uncompressed state is set to be greater than the axial spacing d1 between the top of the second mounting member 64 and the partition plate 30, so that the second seal member 62 is in the compressed state when it is installed in place between the second mounting member 64 and the partition plate 30, thereby ensuring sealing.

[0049] The second mounting member 64 is mounted on the outer shoulder portion 2131, and the second end 2151 of the back pressure passage 215 is always in communication with the back pressure cavity B1. In the present example, in order to prevent the second mounting member 64 from blocking the second end 2151 of the back pressure passage 215 when it is mounted on the outer shoulder portion 2131 of the cylindrical portion 213 of the fixed scroll plate 21, the second mounting member 64 is mounted to the outer shoulder portion 2131 of the fixed scroll plate 21 via the annular retaining member 65 (see Figure 6 、 Figure 7 and Figure 9 ). Figure 10 A plan view of the annular retaining member 65 is shown, which is provided with a notch 651 extending radially inward from the outer periphery of the annular retaining member 65. When the annular retaining member 65 is mounted on the outer shoulder portion 2131 of the fixed scroll plate 21, the notch 651 is located directly above and facing the second end 2151 of the back pressure passage 215, thereby allowing the back pressure cavity B1 to always be in communication with the back pressure passage 215. The notch 651 can penetrate the entire thickness of the annular retaining member 65, or it can extend from one side surface of the annular retaining member 65 in the thickness direction of the annular retaining member 65 but not penetrate the annular retaining member 65. However, the present application is not limited thereto, and in the case where the annular lower end portion of the second mounting member 64 has sufficient radial dimensions and can ensure sufficient rigidity, the annular retaining member 65 can not be provided, and a through hole or a groove is provided at the annular lower end portion of the second mounting member 64 to face the upper end 2151 of the back pressure passage 215, so as to allow the back pressure cavity B1 to always be in communication with the back pressure passage 215.

[0050] In the scroll compressor 100, the variable pressure chamber D1 is selectively communicated with the low pressure space VL or the back pressure chamber B1 via the electromagnetic switching valve 80, so that the pressure P3 in the variable pressure chamber D1 is either the intake pressure or the higher back pressure (pressure P2). Figure 11 A perspective view showing that the electromagnetic switching valve 80 is mounted together with the compression mechanism 20 is shown in FIG. 8. Figure 12 A sectional view showing that the electromagnetic switching valve 80 is cut along the sectional line I-I in FIG. 8 is shown in FIG. 9. Figure 11 A sectional view showing that the electromagnetic switching valve 80 is cut along the sectional line I-I in FIG. 8 is shown in FIG. 9. Figure 11 As shown in FIGS. 8 and 9, the electromagnetic switching valve 80 is mounted to the outer peripheral wall of the adjusting member 72 via a first set of screws T1. Figure 12

[0051] Figure 13 Figure 14 ​​A schematic view of the electromagnetic switching valve 80 is shown. The electromagnetic switching valve 80 is a two-position three-way electromagnetic valve, which includes a first valve body portion 81, a second valve body portion 82, and a control line 83 coupled to each other. The first valve body portion 81 has a first surface 81A, a second surface 81B, and a third surface 81C. The first surface 81A is provided with a first set of mounting holes H1, through which a first set of screws T1 are respectively screwed to mount the first valve body portion 81 to the outer peripheral wall of the second portion 722 of the adjustment member 72. The second surface 81B is provided with a second set of mounting holes H2, through which a second set of screws (not shown) are screwed to couple the first valve body portion 81 and the second valve body portion 82 of the electromagnetic switching valve 80 to each other. The first valve body portion 81 is provided with a first inlet passage 811, a second inlet passage 814, and an outlet passage 817. A first port 812 of the first inlet passage 811 opens at the third surface 81C, which is in communication with the low-pressure space VL, and a second port 813 of the first inlet passage 811 opens at the second surface 81B. A first port 815 of the second inlet passage 814 opens at the first surface 81A, which is in communication with the back pressure cavity B1 through a first through hole (not shown) on the adjustment member 72, and thus in communication with the second compression cavity C2 of the compression mechanism 20. A second port 816 of the second inlet passage 814 opens at the second surface 81B. A first port 818 of the outlet passage 817 opens at the second surface 81B, and a second port 819 of the outlet passage 817 opens at the first surface 81A, which is in communication with the variable pressure chamber D1 through a second through hole (not shown) on the adjustment member 72. A spool (not shown) of the electromagnetic switching valve 80 is controlled to selectively communicate the outlet passage 817 with the first inlet passage 811 or the second inlet passage 814. When the outlet passage 817 is communicated with the first inlet passage 811, the pressure P3 in the variable pressure chamber D1 is the intake pressure. When the outlet passage 817 is communicated with the second inlet passage 814, the pressure P3 in the variable pressure chamber D1 is equal to the back pressure pressure (pressure P2) in the back pressure cavity B1. However, the present application is not limited thereto, and the pressure P3 in the variable pressure chamber D1 does not have to be equal to the back pressure pressure (pressure P2) in the back pressure cavity B1. In other embodiments according to the present application, the second inlet passage 814 of the electromagnetic switching valve 80 can be provided to communicate with other medium pressure cavities in the series of compression cavities of the compression mechanism 20, instead of the back pressure cavity B1.

[0052] The above combination Figures 5 to 14The scroll compressor 100 according to the first embodiment of the present application is introduced. In the scroll compressor 100 according to the first embodiment of the present application, the sealing assembly S1 adopts the design of the flat-top sealing ring, the first sealing part and the second sealing part are formed between the sealing assembly S1 and the partition plate 30, and the sealing surfaces of the first sealing part and the second sealing part are both flexible sealing surfaces, so that the requirement for the contact force of each sealing surface can be reduced, and the pressure in the back pressure cavity B1 can be designed to be smaller. Therefore, compared with the scroll compressor 1 of the comparative example, the scroll compressor 100 according to the first embodiment of the present application can reduce the axial force on the compression mechanism 20 when the scroll compressor 100 is operated under full load conditions, can alleviate the difference between the requirements for the pressure in the back pressure cavity B1 under different load conditions, and can reduce power consumption and improve system performance. Figure 4 and Figure 8 It can be known that the second end 2152 of the back pressure passage 215 can be arranged closer to the outer periphery of the blade 212 of the fixed scroll plate 21, so that the back pressure (pressure P2) is smaller. Through this arrangement, the axial force in the compression mechanism 20 of the scroll compressor 100 when the scroll compressor 100 is operated under full load conditions can be reduced, the difference between the requirements for the pressure in the back pressure cavity B1 under different load conditions can be alleviated, and power consumption can be reduced and system performance can be improved. Moreover, compared with the sealing assembly S of the scroll compressor 1 of the comparative example, the sealing assembly S1 of the scroll compressor 100 according to the first embodiment of the present application itself has lower manufacturing and processing difficulty, and the manufacturing cost can be reduced.

[0053] The first sealing part between the first sealing member 61 and the partition plate 30 isolates the high pressure space VH in the scroll compressor 100 from the back pressure cavity B1 (medium pressure space), and the second sealing part between the second sealing member 62 and the partition plate 30 isolates the back pressure cavity B1 (medium pressure space) in the scroll compressor 100 from the low pressure space VL. There is no direct leakage passage between the high pressure space VH and the low pressure space VL in the scroll compressor 100. Therefore, this design itself can also reduce the requirement for the contact force of each sealing part, so as to help to set the back pressure (pressure P2) in the back pressure cavity B1 to be smaller, and to help to alleviate the difference between the requirements for the back pressure (pressure P2) in the back pressure cavity B1 under different load conditions.

[0054] In addition, in the scroll compressor 100 according to the first embodiment of the present application, the first sealing member 61 is arranged on the radially inner side of the cylindrical part 213 of the fixed scroll plate 21, so that the cross-sectional area of the back pressure cavity B1 perpendicular to the axial direction of the compression mechanism 20 can be set to be smaller. Since the cross-sectional area is reduced, even if the back pressure (pressure P2) in the back pressure cavity B1 remains unchanged, the axial force on the compression mechanism 20 can be reduced. Therefore, this arrangement optimizes the design of the back pressure cavity B1, and further helps to reduce the axial force on the compression mechanism 20.

[0055] And, by abutting the first seal 61 against the partition plate 30 and the cylindrical portion 213 of the fixed scroll 21 by the first mounting member 63, and abutting the second seal 62 against the partition plate 30 and the adjusting member 72 by the second mounting member 64, the sealing of the back pressure cavity B1 is facilitated, and by mounting the second mounting member 64 on the outer shoulder portion 2131 of the fixed scroll 21 with the annular retaining member 65 with the notch 651, the communication of the back pressure cavity B1 with the back pressure passage 215 is facilitated, so as to establish the back pressure in the back pressure cavity B1, and thus facilitate the pressure adjustment of the variable pressure chamber D1.

[0056] The second embodiment of the scroll compressor 200 according to the present application will be described below in conjunction with Figure 15 and Figure 16 The second embodiment of the scroll compressor 200 according to the present application will be described below in conjunction with Figures 1 to 4 the scroll compressor 1 shown in Figures 5 to 14 and the scroll compressor 100 shown in differ in the design of the capacity adjustment device and the sealing assembly, and are basically the same in other aspects. Therefore, only the differences are shown in the drawings, and the same elements as the scroll compressor 1, the scroll compressor 100 are denoted by the same reference numerals, and in the following, the differences will be mainly described, and the same parts will not be described repeatedly.

[0057] Figure 15 A sectional view of the scroll compressor 200 is shown. As Figure 15 indicated, the capacity adjustment device M2 of the scroll compressor 200 has a similar structure as the capacity adjustment device M of the scroll compressor 1 of the comparative example, including the bypass passage 41, the adjusting member 42 and the mounting member 43. Figure 16 A sealing assembly S2 of the scroll compressor 200 is shown. As Figure 16As shown, the seal assembly S2 includes a first seal 91, a second seal 92, a third seal 93, a first mounting member 94, a second mounting member 95, and a third mounting member 96. The second seal 92, the third seal 93, and the third mounting member 96 have the same configurations as the second seal 52, the third seal 53, and the first mounting member 54 of the seal assembly S of the comparative example, respectively. The second mounting member 95 is substantially the same as the first seal 51 of the seal assembly S of the comparative example, except that the second mounting member 95 is provided with an annular flange 951 extending radially inward from an inner wall of the second mounting member 95, and an upper end of the second mounting member 95 does not provide a seal with the partition plate 30. The first seal 91 is a flexible seal, and the first mounting member 94 is a compression spring, a lower end of which is mounted on the annular flange 951 of the second mounting member 95, and an upper end of which abuts the first seal 91 against the partition plate 30 to form a first seal portion, and the first seal 91 is clamped between the partition plate 30 and an upper end of the cylindrical portion 213 of the fixed scroll 21, the first seal portion providing a seal between the high-pressure space VH and the low-pressure space VL within the scroll compressor 200. The second mounting member 95 and the third mounting member 96 are coupled to each other and clamp the second seal 92 and the third seal 93 therebetween. An inner periphery of the second seal 92 forms a second seal portion with an outer peripheral wall of the cylindrical portion 213 of the fixed scroll 21, the second seal portion isolating the high-pressure space VH from the back pressure cavity B2. An outer periphery of the third seal 93 forms a third seal portion with the second portion 422 of the adjustment member 42, the third seal portion isolating the back pressure cavity B2 from the low-pressure space VL. The sealing surface of the first seal portion is a flexible sealing surface, compared with the scroll compressor 1 of the comparative example, the required contact force of the seal portion can be reduced, the back pressure pressure (pressure P2) in the back pressure cavity B2 can be set to be smaller, so that the axial force on the compression mechanism 20 under full load operating conditions can be reduced, the power consumption can be reduced, the requirement of the back pressure pressure (pressure P2) in the back pressure cavity B2 under different load operating conditions can be balanced, the system performance can be improved, and similar technical effects to the scroll compressor 100 according to the first embodiment of the present application can be achieved. Moreover, compared with the scroll compressor 100 according to the first embodiment of the present application, the scroll compressor 200 according to the second embodiment of the present application is less modified based on the scroll compressor 1 of the comparative example.

[0058] Hereinabove, exemplary embodiments of the present application have been described in detail, but it should be understood that the present application is not limited to the specific embodiments described and illustrated hereinabove. Various modifications and variations can be made to the present application by those skilled in the art without departing from the spirit and scope of the present application. All such modifications and variations are intended to be within the scope of the present application. Moreover, all the components described hereinabove can be replaced by other technically equivalent components.

Claims

1. A scroll compressor (100, 200) characterized by, The scroll compressor (100, 200) comprises: a partition plate (30) dividing a space in the scroll compressor (100, 200) into a high-pressure space (VH) and a low-pressure space (VL); a compression mechanism (20) comprising a fixed scroll plate (21) and an orbiting scroll plate (23) cooperating with each other to define a series of compression chambers; a capacity adjustment device (M1, M2) comprising a bypass passage (71, 41) extending through an end plate (211) of the fixed scroll plate (21) such that a first end (711) of the bypass passage (71, 41) opens on a first side of the end plate (211) of the fixed scroll plate (21) to communicate with a first compression chamber (C1) of the series of compression chambers, and a second end of the bypass passage (71, 41) opens on a second, opposite side of the end plate (211) of the fixed scroll plate (21) and selectively communicates with the low-pressure space (VL), and an adjustment member (72, 42) configured to be movable relative to the fixed scroll plate (21) in an axial direction (O) to establish or interrupt the communication between the first compression chamber (C1) and the low-pressure space (VL); a back pressure chamber (B1, B2) formed between the fixed scroll plate (21) and the partition plate (30) and communicating with a second compression chamber (C2) of the series of compression chambers via a back pressure passage (215); and a sealing assembly (S1, S2) isolating the back pressure chamber (B1, B2) from the high-pressure space (VH), the low-pressure space (VL), wherein a first sealing portion is formed between the sealing assembly (S1, S2) and the partition plate (30), a sealing surface of the first sealing portion is a flexible sealing surface, the capacity adjustment device (M1, M2) is provided with a variable pressure chamber (D1, D2) and is configured to move the adjustment member (72, 42) relative to the fixed scroll plate (21) in the axial direction (O) by changing a pressure in the variable pressure chamber (D1, D2).

2. The scroll compressor (100, 200) of claim 1, wherein, At the first sealing portion, a flexible first sealing member (61, 91) of the sealing assembly (S1, S2) is compressed by a first mounting member (63, 94) against the partition plate (30).

3. The scroll compressor (100, 200) of claim 2, wherein, The fixed scroll plate (21) is formed with a cylindrical portion (213) extending axially from the second side of the end plate (211), the cylindrical portion (213) is formed with an outer shoulder portion (2131), The second end of the bypass passage (71) is located radially outward of the cylindrical portion (213), a first end (2152) of the back pressure passage (215) is open to a first side of the end plate (211) of the fixed scroll plate (21) to communicate with the second compression chamber (C2), a second end (2151) of the back pressure passage (215) is open to the outer shoulder portion (2131), the adjusting member (72, 42) is an annular member, the adjusting member (72, 42) sealingly engages with the cylindrical portion, and the adjusting member (72, 42) is movable relative to the cylindrical portion (213) along the axial direction (O), and the back pressure chamber (B1, B2) is defined by the cylindrical portion (213), the partition plate (30), and the adjusting member (72, 42) together.

4. The scroll compressor (100) of claim 3, wherein, A second sealing portion is further formed between the sealing assembly (S1) and the partition plate (30), the second sealing portion is located radially outward of the first sealing portion, at the second sealing portion, a flexible second sealing member (62) of the sealing assembly (S1) is compressed by a second mounting member (64) to abut against the partition plate (30).

5. The scroll compressor (100) of claim 4, wherein, The second sealing member (62) is compressed between an end portion of the second mounting member (64) and the partition plate (30), and at least a portion of the second sealing member (62) is in sealing contact with the adjusting member (72), an axial spacing between the end portion of the second mounting member (64) and the partition plate (30) is d1, an axial spacing between an end portion of the adjusting member (72) and the partition plate (30) is d2, and d1>0.7d2.

6. The scroll compressor (100) of claim 4, wherein, The second mounting member (64) is mounted on the outer shoulder portion (2131) through an annular retaining member (65), the annular retaining member (65) is provided with a notch (651) extending radially inward from an outer periphery of the annular retaining member (65), and the notch (651) faces the second end (2151) of the back pressure passage (215).

7. The scroll compressor (100) of claim 4, wherein, The cylindrical portion (213) further forms an inner shoulder portion (2132), and the first mounting member (63) is mounted on the inner shoulder portion (2132) so that the first sealing portion is located radially inward of the cylindrical portion (213).

8. The scroll compressor (200) of claim 3, wherein, The sealing assembly (S2) further includes an annular second sealing member (92) and a third sealing member (93), and a second mounting member (95) and a third mounting member (96) coupled to each other, the second sealing member (92) and the third sealing member (93) are clamped between the second mounting member (95) and the third mounting member (96), an inner periphery of the second sealing member (92) forms a second sealing portion with an outer peripheral wall of the cylindrical portion (213), and an outer periphery of the third sealing member (93) forms a third sealing portion with an inner peripheral wall of the adjusting member (42).

9. The scroll compressor (200) of claim 8, wherein, The second mounting member (95) is provided with an annular flange (951) extending radially inwardly from an inner wall of the second mounting member (95), and the first mounting member (94) is mounted on the annular flange (951).

10. The scroll compressor (100, 200) of any one of claims 1 to 9, wherein, The variable pressure chamber (D1, D2) is controlled by an electromagnetic switching valve (80) to selectively communicate with the low-pressure space (VL) or the back-pressure cavity (B1, B2).

11. The scroll compressor (100, 200) of claim 10, wherein, When the variable pressure chamber (D1, D2) is controlled to communicate with the low-pressure space (VL), the adjusting member (72, 42) shields the second end of the bypass passage (71, 41) to interrupt the communication between the first compression cavity (C1) and the low-pressure space (VL), so that the scroll compressor (100, 200) operates in full-load condition; When the variable pressure chamber (D1, D2) is controlled to communicate with the back-pressure cavity (B1, B2), the adjusting member (72, 42) opens the second end of the bypass passage (71, 41) to establish the communication between the first compression cavity (C1) and the low-pressure space (VL), so that the scroll compressor (100, 200) operates in partial-load condition.

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