scroll compressor

Abstract

The present disclosure relates to a scroll compressor, which includes a movable scroll, a fixed scroll, a back pressure chamber, and an adjustment assembly. The movable scroll of the fixed scroll and the fixed scroll of the fixed scroll are meshed with each other to define a plurality of compression chambers between the movable scroll and the fixed scroll, wherein the compression chambers include a suction pressure compression chamber, a discharge pressure compression chamber, a first intermediate compression chamber, and a second intermediate compression chamber. The adjustment assembly is configured to be movable between a first position and a second position. When the adjustment assembly is in the first position, the back pressure chamber is fluidically connected to the first intermediate compression chamber and isolated from the second intermediate compression chamber; when the adjustment assembly is in the second position, the back pressure chamber is fluidically connected to the second intermediate compression chamber and isolated from the first intermediate compression chamber. The scroll compressor according to the present disclosure can always provide a preferred back pressure.

Description

Technical Field

[0001] The present invention relates to a scroll compressor, and more particularly, to a scroll compressor having a function of providing optimal back pressure. Background Art

[0002] Scroll compressors can be used in, for example, refrigeration systems, air conditioning systems, and heat pump systems. In these applications, the capacity of the scroll compressor can be adjusted based on the specific needs of the system, allowing the scroll compressor to selectively operate at full capacity or reduced capacity (or half capacity).

[0003] A scroll compressor typically includes a back-pressure chamber connected to an intermediate compression chamber, which can provide back pressure to the fixed scroll to push toward the movable scroll. However, the pressure of the same intermediate compression chamber at full capacity is significantly higher than that at half capacity. At full capacity, the high pressure in the intermediate compression chamber and the high back pressure can cause additional frictional power consumption or wear of the thrust bearing. At half capacity, the low pressure in the intermediate compression chamber and the low back pressure can lead to refrigerant leakage, resulting in excessively high exhaust temperatures or decreased performance.

[0004] Furthermore, it is difficult to provide adequate back pressure in the same intermediate compression chamber under other operating conditions of the scroll compressor. For example, in a variable frequency scroll compressor, it is desirable to provide appropriate back pressure depending on whether the scroll compressor is operating in low-frequency or high-frequency mode. Furthermore, scroll compressors also suffer from the disadvantages of complex structure and low reliability.

[0005] Therefore, it is desired in the art to provide a scroll compressor that can overcome the above disadvantages. Summary of the Invention

[0006] This section provides a general summary of the invention, and is not a comprehensive disclosure of its full scope or all of its features.

[0007] An object of the present invention is to provide a scroll compressor that can always provide a preferred back pressure.

[0008] Another object of the present invention is to provide a scroll compressor that enables the capacity of the scroll compressor to be varied over a wider range while still ensuring that a preferred back pressure is provided.

[0009] Another object of the present invention is to provide a scroll compressor that can provide an appropriate back pressure in a manner that is simple in structure and highly reliable.

[0010] In some examples, a scroll compressor is provided, comprising: an orbiting scroll, the orbiting scroll comprising a first end plate and an orbiting scroll extending from the first end plate; a fixed scroll, the fixed scroll comprising a second end plate and a fixed scroll extending from the second end plate, the orbiting scroll and the fixed scroll meshing with each other to define a plurality of compression chambers between the orbiting scroll and the fixed scroll, wherein the compression chamber comprises a suction pressure compression chamber communicating with a suction pressure region, a discharge pressure compression chamber communicating with a discharge pressure region, and a plurality of intermediate compression chambers, the intermediate compression chamber comprising a first intermediate compression chamber and a second intermediate compression chamber, the pressure of the first intermediate compression chamber being greater than that of the second intermediate compression chamber The pressure of the two intermediate compression chambers; a back-pressure chamber, which is arranged on the side of the second end plate opposite to the fixed scroll, and is suitable for applying a back-pressure force to push the fixed scroll toward the movable scroll; and an adjusting component, characterized in that the adjusting component is constructed to be able to move (axially) between a first position and a second position, and when the adjusting component is in the first position, the back-pressure chamber is fluidly connected to the first intermediate compression chamber and isolated from the second intermediate compression chamber; when the adjusting component is in the second position, the back-pressure chamber is fluidly connected to the second intermediate compression chamber and isolated from the first intermediate compression chamber.

[0011] In some examples, the modulation assembly is further configured to switch the scroll compressor between a first capacity mode and a second capacity mode lower than the first capacity mode, and wherein when the modulation assembly is in the first position, the scroll compressor is in the first capacity mode, and when the modulation assembly is in the second position, the scroll compressor is in the second capacity mode.

[0012] In some examples, the adjustment assembly includes an adjustment ring, the second end plate is formed with an adjustment passage extending through the second end plate, and the adjustment ring is movable relative to the second end plate between a first position and a second position. In the first position, the adjustment ring contacts the second end plate to close the adjustment passage. In the second position, the adjustment ring is spaced apart from the second end plate, and the adjustment passage is in fluid communication with the suction pressure region.

[0013] In some examples, a hub is formed on a side of the second end plate opposite to the fixed scroll, the hub including a first annular portion and a second annular portion, the outer diameter of the first annular portion being larger than the outer diameter of the second annular portion so as to form a step surface between the first annular portion and the second annular portion, the adjustment ring surrounds the first annular portion and is in sealing contact with the first annular portion, the back pressure chamber is formed between the second annular portion and the adjustment ring, the top of the back pressure chamber is sealed by a floating seal and the bottom is defined by the step surface and the top surface of the adjustment ring facing the sealing float.

[0014] In some examples, a first intermediate-pressure channel, a second intermediate-pressure channel, and a connecting channel are formed in the fixed scroll, wherein one end of the first intermediate-pressure channel is open to the first intermediate compression chamber and the other end of the first intermediate-pressure channel is open to the outer peripheral wall of the first annular portion, one end of the second intermediate-pressure channel is open to the second intermediate compression chamber and the other end of the second intermediate-pressure channel is open to the outer peripheral wall of the first annular portion, the other end of the first intermediate-pressure channel is axially spaced from the other end of the second intermediate-pressure channel, and one end of the connecting channel is open to the outer peripheral wall of the first annular portion and the other end of the connecting channel is open to the step surface.

[0015] In some examples, a first seal, a second seal, and an air guide channel are provided on the wall surface of the inner circumferential wall of the adjustment ring, the first seal is axially spaced apart from the second seal, and the air guide channel is axially located between the first seal and the second seal.

[0016] In some examples, at the first position, the first seal opens the other end of the first medium-pressure channel and the second seal closes the other end of the second medium-pressure channel, and the fluid flows from the first intermediate compression chamber through the first medium-pressure channel, the air guide channel, and the connecting channel and flows into the back-pressure chamber; at the second position, the first seal closes the other end of the first medium-pressure channel and the second seal opens the other end of the second medium-pressure channel, and the fluid flows from the second intermediate compression chamber through the second medium-pressure channel, the air guide channel, and the connecting channel and flows into the back-pressure chamber.

[0017] In some examples, a countersink, a first intermediate-pressure channel, a second intermediate-pressure channel, and a connecting channel are formed in the fixed scroll, wherein the countersink is formed in the second end plate and opens toward the side of the second end plate opposite to the fixed scroll, one end of the first intermediate-pressure channel opens to the first intermediate compression chamber and the other end of the first intermediate-pressure channel opens to the countersink, one end of the second intermediate-pressure channel opens to the second intermediate compression chamber and the other end of the second intermediate-pressure channel opens to the countersink, the other end of the first intermediate-pressure channel is axially spaced from the other end of the second intermediate-pressure channel, one end of the connecting channel opens to the countersink and the other end of the connecting channel opens to the back-pressure chamber.

[0018] In some examples, the adjustment assembly also includes a piston capable of moving integrally with the adjustment ring, the piston being disposed in the counterbore, the piston forming a hollow fluid cavity and a first air inlet hole, an exhaust hole, and a second air inlet hole extending from the fluid cavity to the outer surface of the piston, the first air inlet hole, the exhaust hole, and the second air inlet hole being axially spaced from each other, the piston also including a recessed portion recessed inward from its outer surface, the exhaust hole being at least partially disposed in the recess.

[0019] In some examples, at the first position, the first air inlet hole is aligned with the other end of the first medium-pressure channel and the second air inlet hole is spaced apart from the other end of the second medium-pressure channel, and the fluid flows from the first intermediate compression chamber into the fluid chamber via the first medium-pressure channel, and flows from the exhaust hole into the back-pressure chamber via the recess and the connecting channel; at the second position, the first air inlet hole is spaced apart from the other end of the first medium-pressure channel and the second air inlet hole is aligned with the other end of the second medium-pressure channel, and the fluid flows from the second intermediate compression chamber into the fluid chamber via the second medium-pressure channel, and flows from the exhaust hole into the back-pressure chamber via the recess and the connecting channel.

[0020] In some examples, a pressure supplement hole is further formed in the fixed scroll, connecting the counterbore with one of the intermediate compression chambers in fluid communication.

[0021] In some examples, the piston is formed with a protrusion, and the counterbore is provided with a groove that matches the shape of the protrusion, and the protrusion is inserted into the groove to prevent the piston from rotating relative to the counterbore.

[0022] In some examples, the regulating passage is fluidically connected to the first intermediate compression chamber and is constructed as a first intermediate-pressure passage suitable for fluidly connecting the first intermediate compression chamber to the back-pressure chamber. A second intermediate-pressure passage is also formed in the fixed scroll, one end of the second intermediate-pressure passage is open to the second intermediate compression chamber and the other end of the second intermediate-pressure passage is open to the step surface.

[0023] In some examples, the adjustment assembly further includes a first valve and a second valve, the inner circumferential wall of the adjustment ring is formed with a passage extending through the inner circumferential wall in an axial direction and aligned with the first medium-pressure channel, the first valve is disposed in the passage and is capable of selectively opening or closing the passage, and the second valve is suitable for selectively opening or closing the other end of the second medium-pressure channel.

[0024] In some examples, the first valve includes a valve housing formed with a valve hole, and a spring and a spherical seal accommodated in the valve housing, the spring being adapted to apply a biasing force to the spherical seal to force the spherical seal toward the valve hole, and the spherical seal being axially movable to selectively open or close the valve hole.

[0025] In some examples, one end of the second valve is fixed to the step surface and the other end of the second valve is set as a free end and is located above the top surface of the adjustment ring.

[0026] In some examples, the second valve is formed as an L-shaped elastic valve plate, and a corner portion of the L-shaped elastic valve plate covers the other end of the second medium-pressure channel.

[0027] In some examples, at the first position, the first valve opens the passage and the second valve closes the second intermediate-pressure passage, and the fluid flows from the first intermediate compression chamber into the back-pressure chamber via the first intermediate-pressure passage and the passage; at the second position, the free end of the second valve is lifted by the adjustment ring to open the second intermediate-pressure passage and the first valve closes the passage, so that the fluid in the second intermediate compression chamber flows into the back-pressure chamber via the second intermediate-pressure passage and the fluid in the first intermediate compression chamber flows to the suction pressure area via the first intermediate-pressure passage and the gap between the adjustment ring and the second end plate.

[0028] In some examples, the regulating assembly further includes a support ring and a regulating control valve, wherein the regulating ring defines a cavity, the support ring is sealingly disposed in the cavity to form a regulating control chamber, and the regulating control valve selectively connects the regulating control chamber to a pressure source with a lower pressure or a pressure source with a higher pressure.

[0029] The scroll compressor according to the present disclosure can adjust the back pressure differently according to the different capacity modes of the scroll compressor. Thus, it can not only reduce the friction loss of the scroll compressor in the full capacity state, but also prevent refrigerant leakage in the reduced capacity mode, thereby improving the efficiency of the scroll compressor.

[0030] The scroll compressor according to the present disclosure can provide sufficient back pressure even when the capacity reduction is relatively low, which enables the scroll compressor to have a larger capacity adjustment range.

[0031] In addition, the scroll compressor according to the present disclosure uses the same adjustment assembly to simultaneously adjust the capacity and back pressure of the scroll compressor, thereby being able to provide an appropriate back pressure in a manner with a simple structure and higher reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The features and advantages of one or more embodiments of the present invention will become more readily understood through the following description with reference to the accompanying drawings, in which:

[0033] Figure 1 is a cross-sectional view of a scroll compressor according to a first embodiment of the present disclosure;

[0034] Figure 2 is a perspective view of a fixed scroll of a scroll compressor according to a first embodiment of the present disclosure;

[0035] Figure 3 is a cross-sectional view of a fixed scroll of a scroll compressor according to a first embodiment of the present disclosure;

[0036] Figure 4 is another cross-sectional view of the fixed scroll of the scroll compressor according to the first embodiment of the present disclosure;

[0037] Figures 5A-5C is a cross-sectional view of a scroll compressor according to a first embodiment of the present disclosure in a full capacity state, wherein some components of the scroll compressor are omitted for clarity of illustration;

[0038] Figures 6A-6C is a cross-sectional view of a scroll compressor according to a first embodiment of the present disclosure in a reduced capacity state, wherein some components of the scroll compressor are omitted for clarity of illustration;

[0039] Figure 7 is a perspective view of a fixed scroll of a scroll compressor according to a second embodiment of the present disclosure;

[0040] Figures 8-10 is a cross-sectional view of a fixed scroll of a scroll compressor according to a second embodiment of the present disclosure;

[0041] Figure 11 is a perspective view of a piston of a scroll compressor according to a second embodiment of the present disclosure;

[0042] Figures 12A-12C is a cross-sectional view of a piston of a scroll compressor according to a second embodiment of the present disclosure;

[0043] Figures 13A-13D is a cross-sectional view of a scroll compressor according to a second embodiment of the present disclosure in a full capacity state, wherein some components of the scroll compressor are omitted for clarity of illustration;

[0044] Figures 14A-14D is a cross-sectional view of a scroll compressor according to a second embodiment of the present disclosure in a reduced capacity state, wherein some components of the scroll compressor are omitted for clarity of illustration;

[0045] Figure 15A and15B is a cross-sectional view of a scroll compressor according to a third embodiment of the present disclosure in a full capacity state, wherein some components of the scroll compressor are omitted for clarity of illustration;

[0046] Figure 15C and 15D is a partially enlarged cross-sectional view of a scroll compressor according to a third embodiment of the present disclosure in a full capacity state;

[0047] Figure 16A and 16B is a cross-sectional view of a scroll compressor according to a third embodiment of the present disclosure in a reduced capacity state, with some components of the scroll compressor omitted for clarity; and

[0048] Figure 16C and 16D is a partially enlarged cross-sectional view of a scroll compressor according to a third embodiment of the present disclosure in a reduced capacity state. DETAILED DESCRIPTION

[0049] The present invention will be described in detail below with reference to the accompanying drawings and exemplary embodiments. The following detailed description of the present invention is for illustrative purposes only and is in no way intended to limit the present invention, its application or use.

[0050] Reference Figure 1 The scroll compressor 1 of the first embodiment of the present disclosure may include a housing assembly 10, a bearing seat assembly 20, a motor assembly 30, a compression mechanism 40 and an adjustment assembly 50, wherein the housing assembly 10 may accommodate the bearing seat assembly 20, the motor assembly 30, the compression mechanism 40 and the adjustment assembly 50.

[0051] The shell assembly 10 can be composed of a roughly cylindrical main body, a top cover 12 arranged at one end of the main body, and a bottom cover arranged at the other end of the main body. A partition 14 is provided between the top cover 12 and the main body to separate the internal space of the shell into a low-pressure fluid suction chamber (or suction pressure area) and a high-pressure fluid discharge chamber (or discharge pressure area). Specifically, the space between the partition 14 and the top cover 12 constitutes the fluid discharge chamber, and the space between the partition 14, the main body and the bottom cover constitutes the fluid suction chamber. An air inlet connector for sucking in fluid is provided on one side of the fluid suction chamber, and an air exhaust connector for discharging compressed fluid is provided on one side of the fluid discharge chamber.

[0052] The compression mechanism 40 draws fluid from the fluid intake chamber and compresses the fluid and discharges it into the fluid discharge chamber. Figure 1, the compression mechanism may include, for example, a fixed scroll 60 and a movable scroll 70. The movable scroll 70 includes a first end plate 74 and a spiral movable scroll 76 formed on one side of the first end plate. The fixed scroll 60 includes a second end plate 64 and a spiral fixed scroll 66 formed on one side of the second end plate and an annular hub 68 formed on the other side of the second end plate 64. An exhaust channel 62 is formed at a substantially central position of the second end plate 64, and an adjustment channel 65 is formed radially outside the exhaust channel. The fixed scroll 66 of the fixed scroll 60 and the movable scroll 76 of the movable scroll 70 mesh with each other and form a series of compression chambers whose volumes gradually decrease from the radial outside to the radial inside to compress the fluid.

[0053] The first cavity ( Figure 1 The second cavity ( 92 ) can define a suction pressure compression cavity that communicates with the suction pressure region of the scroll compressor 1 . Figure 1 The chamber 98 in the scroll compressor 1 may define a discharge pressure compression chamber that communicates with the discharge pressure region of the scroll compressor 1 via the discharge passage 62. An intermediate compression chamber (e.g., Figure 1 The first intermediate compression chamber 94 and the second intermediate compression chamber 96 in the middle can form an intermediate compression chamber operating at an intermediate pressure between the suction pressure and the discharge pressure, wherein the second intermediate compression chamber can be located radially inside the first intermediate compression chamber and have a greater pressure than the first intermediate compression chamber.

[0054] like Figure 2 As shown, the annular hub portion 68 of the non-orbiting scroll may include a first annular portion 116 and a second annular portion 118, with a step surface 120 formed between the first portion 116 and the second annular portion 118. The first annular portion 116 may be located axially between the second annular portion 118 and the second end plate 64, and the outer diameter of the first annular portion 116 may be greater than the outer diameter of the second annular portion 118.

[0055] Reference Figures 3 and 4, the fixed scroll can be provided with a first medium-pressure channel P1 and a second medium-pressure channel P2. One end of the first medium-pressure channel P1 is open to the first intermediate compression chamber 94, and the other end of the first medium-pressure channel P1 (hereinafter referred to as the first medium-pressure port H1) can be open to the outer peripheral wall of the first annular portion 116, thereby, the first medium-pressure channel P1 enables the fluid to flow from the first intermediate compression chamber 94 to the first medium-pressure port H1. One end of the second medium-pressure channel P2 is open to the second intermediate compression chamber 96, and the other end of the second medium-pressure channel P2 (hereinafter referred to as the second medium-pressure port H2) can be open to the outer peripheral wall of the first annular portion 116 and axially spaced from the first medium-pressure port H1, thereby, the first medium-pressure channel P2 enables the fluid to flow from the second intermediate compression chamber 96 to the second medium-pressure port H2. The hub can also be formed with a connecting channel P3, one end H3 of the connecting channel P3 is open to the outer peripheral wall of the first annular portion 116, and the other end H4 is open to the step surface 120. As Figure 2 As shown, the first intermediate-pressure port H1 , the second intermediate-pressure port H2 , and the third intermediate-pressure port H3 may be spaced apart from each other in the circumferential direction, thereby facilitating machining corresponding channels in the fixed scroll.

[0056] Reference Figure 5A , the adjustment assembly 50 may include an adjustment ring 126, a support ring 128, and a modulation control valve (not shown). As will be described in more detail below, the adjustment assembly 50 is operable to enable the scroll compressor to operate in a first capacity mode (e.g., full capacity mode, Figures 5A-5C ) and a second capacity mode (e.g., reduced capacity mode, Figures 6A-6C In the full capacity mode, fluid communication between the regulating passage 65 and the suction pressure region is prevented. In the reduced capacity mode, fluid communication between the regulating passage 65 and the suction pressure region is permitted, allowing the intermediate-pressure working fluid to flow from the intermediate compression chamber to the suction pressure region.

[0057] like Figure 5AAs shown, the adjustment ring 126 may include an inner circumferential wall 132, an outer circumferential wall 134, a connecting portion 136 connecting the inner and outer circumferential walls, and an annular flange 138 protruding upward from the connecting portion. The inner circumferential wall 132 of the adjustment ring 126 is provided with a first seal S1, a second seal S2, and a hollow air guide channel 135 located between the first and second seals, wherein the first seal S1 and the second seal S2 are axially spaced apart. It will be understood that the circumferential wall herein refers to the wall body or wall portion. It should be noted that the air guide channel 135 and the seal are preferably annular, thereby facilitating the installation of the adjustment ring 126 on the hub 68 without requiring any positioning. However, the air guide channel 135 and the seal may also be partially annular (e.g., semi-annular, as long as the air guide channel 135 extends circumferentially through the first intermediate-pressure port H1 and the second intermediate-pressure port H2), and the adjustment ring and the hub are further provided with cooperating positioning structures.

[0058] Adjustment ring 126 can be received on second end plate 64 such that first portion 116 of hub 68 sealingly engages inner circumferential wall 132 of adjustment ring 126 (via seals S1 and S2). Furthermore, adjustment ring 126 can cooperate with hub 68 and the floating seal to define a backpressure chamber 80. More specifically, backpressure chamber 80 can be formed between annular flange 138 of adjustment ring 126 and second annular portion 118 of hub, with the top portion sealed by floating seal 73 disposed therein and the bottom portion formed by stepped surface 120 and the top surface of the connecting portion facing the floating seal. The interface between stepped surface 128 and the top surface is sealed via annular seals S1 and S2. The inner circumferential wall, outer circumferential wall, and connecting portion of adjustment ring 126 can define an annular cavity.

[0059] The support ring 128 may be disposed within the annular cavity. The adjustment ring 126 and the support ring 128 may cooperate to define an adjustment control chamber 140 disposed within the cavity.

[0060] As will be described in more detail below, the adjustment ring 126 is capable of being positioned in a first position ( Figures 5A-5C ) and the second position ( Figures 6A-6C ). In the first position ( Figure 5A ), the inner peripheral wall 132 of the adjustment ring contacts the second end plate 64 and closes the adjustment channel 65 to prevent fluid communication between the adjustment channel 65 and the suction pressure area. Figure 6A), the inner peripheral wall 132 of the adjustment ring is spaced apart from the second end plate 64 to open the adjustment passage 65, thereby allowing fluid communication between the adjustment passage 65 and the suction pressure area. The adjustment ring 126 can selectively fluidically connect the backpressure chamber 80 to one of the first intermediate-pressure port H1 and the second intermediate-pressure port H2. During full-capacity mode, the adjustment ring 126 opens the first intermediate-pressure port H1 and closes the second intermediate-pressure port H2, and the first intermediate-pressure port H1 is selectively in fluid communication with the backpressure chamber. During reduced-capacity mode, the adjustment ring 126 opens the second intermediate-pressure port H2 and closes the first intermediate-pressure port H1, and the second intermediate-pressure port H2 is selectively in fluid communication with the backpressure chamber. The intermediate-pressure working fluid in the back-pressure chamber 80 (supplied by one of the first intermediate-pressure port H1 or the second intermediate-pressure port H1) pushes the fixed vortex 60 toward the movable vortex 70 in the axial direction to provide appropriate axial sealing between the fixed vortex 60 and the movable vortex 70, that is, the sealing between the tip of the movable scroll 76 of the movable scroll 70 against the second end plate 64 of the fixed vortex 60, and the sealing between the tip of the fixed scroll 66 of the fixed vortex 60 against the first end plate 74 of the movable vortex 70.

[0061] The modulating control valve can include a solenoid-operated three-way valve and can be in communication with a lower pressure source or a higher pressure source, such as a suction pressure region and a backpressure chamber, respectively. During operation of the scroll compressor, the modulating control valve can be operated to switch the scroll compressor between a first mode (e.g., a full capacity mode) and a second mode (e.g., a half capacity or reduced capacity mode).

[0062] When the scroll compressor is in full capacity mode (e.g. Figure 5A ), the regulating control valve can provide fluid communication between the regulating control chamber 140 and the suction pressure region, thereby reducing the fluid pressure in the regulating control chamber 140 to the suction pressure. When the fluid pressure in the regulating control chamber 140 is at or close to the suction pressure, the relatively high fluid pressure in the back-pressure chamber 80 will force the regulating ring 126 to move axially downward relative to the second end plate 64 (i.e., away from the floating seal 73), causing the lower end of the inner peripheral wall 132 of the regulating ring 126 to contact the second end plate 64 and close the regulating passage 65 (i.e., preventing fluid communication between the regulating passage 65 and the suction pressure region).

[0063] As described above, the adjustment ring 126 is in the first axially downward position when the scroll compressor is in full capacity mode. Figure 5B As shown, the first annular seal S1 on the upper side of the adjustment ring 126 seals the second medium pressure port H2, and Figure 5CAs shown, the second annular seal S2 on the underside of the adjustment ring is spaced apart from the first intermediate-pressure port H1. That is, during full-capacity mode, the adjustment ring 126 opens the first intermediate-pressure port H1 and closes the second intermediate-pressure port H2. Fluid from the first intermediate-pressure port H1 flows via the annular air guide passage 135 into the third intermediate-pressure port H3 and then into the fourth intermediate-pressure port H4, thereby flowing into the back-pressure chamber 80. That is, when the scroll compressor is in full-capacity mode, the first intermediate-pressure port H1 is selectively in fluid communication with the back-pressure chamber 80.

[0064] When the scroll compressor 1 is in the reduced capacity mode (e.g. Figure 6A ), the regulating control valve can provide fluid communication between the regulating control chamber 140 and the backpressure chamber 80, thereby increasing the fluid pressure in the regulating control chamber to the same or similar intermediate pressure as the backpressure chamber. When the fluid pressure in the regulating control chamber 140 is at the same intermediate pressure as the backpressure chamber 80, the fluid pressure in the regulating control chamber 140 and the fluid pressure in the regulating passage 65 will force the regulating ring 126 to move axially upward relative to the second end plate 64 (i.e., toward the floating seal 73), so that the regulating ring 126 is spaced apart from the second end plate 64 to open the regulating passage 65 (i.e., allow fluid communication between the regulating passage 65 and the suction pressure region).

[0065] As described above, the adjustment ring 126 is in the second axially upward position when the scroll compressor is in the reduced capacity mode. Figure 6B As shown, the second annular seal S2 on the lower side of the adjustment ring 126 seals the first medium pressure port H1, and Figure 6C As shown, the first annular seal S1 on the upper side of the adjustment ring 126 is spaced apart from the second intermediate-pressure port H2. That is, during reduced capacity mode, the adjustment ring opens the second intermediate-pressure port H2 and closes the first intermediate-pressure port H1. Fluid from the second intermediate-pressure port H2 flows through the annular air guide passage 135 into the third intermediate-pressure port H3 and then into the fourth intermediate-pressure port H4, thereby flowing into the back-pressure chamber 80. That is, when the scroll compressor is in half-capacity mode, the second intermediate-pressure port H2 selectively communicates with the back-pressure chamber 80.

[0066] When the scroll compressor switches between full capacity mode and reduced capacity mode, by switching through which of the first intermediate pressure port H1 and the second intermediate pressure port H2 the working fluid is supplied to the back pressure chamber, the regulating assembly 50 of the present disclosure can supply the working fluid of a more preferred pressure to the back pressure chamber in both full capacity mode and reduced capacity mode.

[0067] Specifically, since the working fluid is discharged to the suction pressure area through the regulating passage 65 during the reduced capacity mode, even if the pressure of the working fluid supplied by the first intermediate pressure port H1 may be appropriate when the scroll compressor is in full capacity mode, the pressure of the working fluid at the first intermediate pressure port H1 is lower during the reduced capacity mode than during the full capacity mode and may not be sufficient to provide sufficient back pressure. In order to compensate for the reduction in fluid pressure, the first intermediate pressure port H1 is closed and the second intermediate pressure port H2 is opened in the reduced capacity mode, so that during the reduced capacity mode, the working fluid from the second intermediate compression chamber with a higher pressure is supplied to the back pressure chamber. In this way, a working fluid of appropriate high pressure can be supplied to the back pressure chamber during the reduced capacity mode to provide sufficient back pressure to cause the fixed scroll 60 to axially abut against the movable scroll 70, thereby ensuring proper sealing between the tip of the movable scroll 76 and the second end plate 64, and the tip of the fixed scroll 66 and the first end plate 74.

[0068] On the other hand, in full capacity mode, working fluid is supplied from the first intermediate pressure port H1 (i.e., the first intermediate compression chamber) to the back-pressure chamber to ensure that the pressure of the working fluid in the back-pressure chamber 80 is not too high in full capacity mode. This ensures that the fixed scroll 60 and the orbiting scroll 70 do not excessively clamp against each other. Excessive clamping of the fixed scroll 60 and the orbiting scroll 70 against each other would introduce excessive friction loads between the fixed scroll 60 and the orbiting scroll 70, which would result in increased wear, increased power consumption, and loss of efficiency. Therefore, the operation of the regulating ring valve minimizes wear and improves the efficiency of the scroll compressor 1 in full capacity mode and reduced capacity mode.

[0069] Furthermore, the scroll compressor according to the present disclosure can provide sufficient backup pressure even when the scroll compressor capacity is very small, thereby enabling the scroll compressor capacity to be varied over a wider range while still ensuring the provision of an optimal back pressure. Furthermore, the scroll compressor according to the present disclosure utilizes the same regulating assembly to simultaneously adjust the scroll compressor capacity and back pressure. Specifically, by simply controlling the movement of the regulating valve ring, both the scroll compressor capacity and back pressure can be adjusted simultaneously. This allows the scroll compressor to provide an appropriate back pressure in response to capacity changes in a structurally simple and highly reliable manner.

[0070] Refer to the following Figures 7 to 14D A scroll compressor according to a second embodiment of the present disclosure will be described.

[0071] The scroll compressor according to the second embodiment of the present disclosure has similar structures and functions to those of the scroll compressor according to the first embodiment of the present disclosure, and the same structures and components will not be described in detail. The following will mainly describe the differences in detail.

[0072] Reference Figures 7 to 10The end plate of the fixed scroll 60A of the scroll compressor according to the second embodiment may be provided with a counterbore PH, a first intermediate pressure passage P1A, a second intermediate pressure passage P2A, and a communication passage P3A. Figure 9 As shown, one end of the first intermediate pressure passage P1A is open to the first intermediate compression chamber and the other end (hereinafter referred to as the first intermediate pressure port H1A) can be open to the counterbore PH, thereby allowing the first intermediate pressure passage P1A to allow fluid to flow from the first intermediate compression chamber to the first intermediate pressure port H1A. Figure 10 As shown, one end of the second intermediate pressure passage P2A is open to the second intermediate compression chamber and the other end (hereinafter referred to as the second intermediate pressure port H2A) can be open to the counterbore PH. The second intermediate pressure port H2A can be axially spaced apart from the first intermediate pressure port H1A. Thus, the second intermediate pressure passage P2A enables fluid to flow from the second intermediate compression chamber to the second intermediate pressure port H2A. Figure 8 , one end H3A of the communication passage P3A may be open to the counterbore PH and the other end H4A may be open to the step surface 120. Figure 8 A pressure supplement hole PS can be provided below the counterbore PH to connect the counterbore PH with the compression chamber fluid below. In actual processing, the first medium-pressure channel P1A, the second medium-pressure channel P2A and the connecting channel P3A (such as Figure 8-10 ) includes a radially extending portion extending from one radial end portion of the end plate, but it should be understood that the effective portion of each channel only includes the portion located radially inside the counterbore, and a plug is usually provided at the radial end to prevent fluid leakage.

[0073] Reference Figure 13A The inner peripheral wall 132A of the adjustment ring 126A of the scroll compressor according to the second embodiment of the present disclosure is provided with an annular seal S so that the inner peripheral wall 132A is in sealing contact with the first annular portion 116. Figure 13B As shown, the adjustment assembly further includes a piston 200, which can move integrally with the adjustment ring 126A. Figures 11 to 12C The piston 200 may include a first air inlet 210, an air outlet 220, and a second air inlet 230 spaced apart from each other in the axial direction. A fluid cavity 240 is formed inside the piston 200. The first air inlet 210, the second air inlet 230, and the air outlet 220 extend from the fluid cavity 240 to the outer surface of the piston. Figure 12C As shown, the piston 200 may further include a recess 250 recessed inward from the outer surface of the piston, and the exhaust hole 220 is at least partially disposed in the recess 250. The piston 200 may be shaped to fit with the counterbore PH in the end plate and inserted into the counterbore PH. Figure 11As shown, the piston 200 may further have a protrusion 260 , which may cooperate with the concave shape of the counterbore PH to prevent the piston 200 from rotating relative to the counterbore PH.

[0074] Similar to the scroll compressor 1 according to the first embodiment of the present disclosure, the adjustment ring 126A of the scroll compressor according to the second embodiment of the present disclosure moves axially between the first position and the second position to enable the scroll compressor to operate in a first capacity mode (e.g., full capacity mode, such as Figure 13A ) and a second capacity mode (e.g., a reduced capacity mode, such as Figure 14A In full capacity mode, fluid communication between the regulating passage 65 and the suction pressure region is prevented. In reduced capacity mode, fluid communication between the regulating passage 65 and the suction pressure region is permitted, allowing intermediate-pressure working fluid to flow from the intermediate compression chamber to the suction pressure region.

[0075] The adjustment ring is in the first axially downward position when the scroll compressor is in full capacity mode. Figure 13B As shown, the first air inlet hole 210 on the lower side of the piston is aligned with the first medium pressure port H1A, and as shown Figure 13D As shown, the second air inlet hole 230 on the upper side of the piston is spaced apart from the second medium pressure port H2A. That is, during the full capacity mode, the piston 200 of the adjustment ring opens the first medium pressure port H1A and closes the second medium pressure port H2A. The fluid enters the fluid chamber 240 of the piston from the first medium pressure port H1A through the first air inlet hole 210 and enters the fluid chamber 240 of the piston from the exhaust hole 220 through the recess 250 (see FIG. Figure 13C ) enters the third intermediate-pressure port H3A, and then enters the fourth intermediate-pressure port H4A from the third intermediate-pressure port H3A, thereby flowing into the back-pressure chamber 80. That is, when the scroll compressor is in full capacity mode, the first intermediate-pressure port H1A selectively communicates with the back-pressure chamber.

[0076] The adjustment ring is in the second axially upward position when the scroll compressor is in the reduced capacity mode. Figure 14B As shown, the first air inlet hole 210 on the lower side of the piston is separated from the first medium pressure port H1A, and as shown in FIG. Figure 14D As shown, the second air inlet hole 230 on the upper side of the piston is aligned with the second medium pressure port H2A. That is, during the capacity reduction mode, the piston 200 of the adjustment ring closes the first medium pressure port H1A and opens the second medium pressure port H2A. The fluid enters the fluid chamber 240 of the piston from the first medium pressure port H1A through the first air inlet hole 210 and enters the fluid chamber 240 of the piston from the exhaust hole 220 through the recess 250 (refer to FIG. Figure 14C) enters the third intermediate-pressure port H3A, and then enters the fourth intermediate-pressure port H4A from the third intermediate-pressure port H3A, thereby flowing into the back-pressure chamber 80. That is, when the scroll compressor is in full capacity mode, the second intermediate-pressure port H2A selectively communicates with the back-pressure chamber 80.

[0077] The adjustment ring 126A can be formed integrally with or separately from the piston 200. In the case where the adjustment ring 126A is formed separately from the piston 200, the pressure replenishment hole PS can provide an upward buoyancy force to the piston 200 to prevent the piston from getting stuck in the counterbore and being unable to move axially upward with the adjustment ring 126A.

[0078] When the scroll compressor switches between full capacity mode and reduced capacity mode, by switching which of the first intermediate pressure port and the second intermediate pressure port is used to supply the working fluid to the back pressure chamber, the regulating assembly 50 of the present disclosure can supply the working fluid of a more preferred pressure to the back pressure chamber in full capacity mode and reduced capacity mode. In reduced capacity mode, the first intermediate pressure port H1A is closed and the second intermediate pressure port H2A is opened, so that during reduced capacity mode, the working fluid from the second intermediate compression chamber with a higher pressure is supplied to the back pressure chamber. In this way, a working fluid of appropriate high pressure can be supplied to the back pressure chamber during reduced capacity mode to provide sufficient back pressure to cause the fixed scroll 60A to axially abut against the movable scroll 7O, thereby ensuring proper sealing between the tip of the movable scroll 76 and the second end plate 64 and the tip of the fixed scroll 66 and the first end plate 74.

[0079] In full capacity mode, working fluid is supplied to the back pressure chamber from the first intermediate pressure port H1A (i.e., the first intermediate compression chamber) to ensure that the pressure of the working fluid in the back pressure chamber is not too high in full capacity mode, which ensures that the fixed scroll 60A and the orbiting scroll do not excessively clamp against each other. Excessive clamping of the fixed scroll 60A and the orbiting scroll against each other would introduce excessive friction loads between the fixed scroll 60A and the orbiting scroll, which would result in increased wear, increased power consumption, and loss of efficiency. Therefore, the operation of the regulating assembly minimizes wear and improves the efficiency of the scroll compressor in full capacity mode and reduced capacity mode.

[0080] Furthermore, the scroll compressor according to the second embodiment of the present disclosure can still provide sufficient backup pressure even when the scroll compressor capacity is very small, thereby enabling the scroll compressor capacity to be varied over a wider range while still ensuring the provision of an optimal back pressure. Furthermore, the scroll compressor according to the second embodiment of the present disclosure utilizes the same regulating assembly to simultaneously adjust the scroll compressor capacity and back pressure. Specifically, by simply controlling the movement of the regulating valve ring, both the scroll compressor capacity and back pressure can be adjusted simultaneously. This allows the scroll compressor to provide an appropriate back pressure in response to capacity changes in a structurally simple and highly reliable manner.

[0081] Refer to the following 15A to 16D A scroll compressor according to a third embodiment of the present disclosure will be described.

[0082] The scroll compressor according to the third embodiment of the present disclosure has similar structures and functions to those of the scroll compressor according to the first embodiment of the present disclosure, and their identical structures and components will not be described in detail, and their differences will be mainly described in detail below.

[0083] Reference Figure 15A and Figure 15B According to the third embodiment of the present disclosure, the end plate of the fixed scroll 60B of the scroll compressor may be formed with a first intermediate pressure passage P1B and a second intermediate pressure passage P2B. Figure 15A As shown, the first intermediate pressure passage P1B is in fluid communication with the first intermediate compression chamber, and here, the regulating passage 65 is configured to also serve as the first intermediate pressure passage P1B for fluid communication between the first intermediate compression chamber and the back pressure chamber. Figure 15B As shown, one end of the second intermediate-pressure passage P2B is open to the second intermediate compression chamber and the other end of the second intermediate-pressure passage (hereinafter referred to as the second intermediate-pressure port) H2B is open to the step surface 120 .

[0084] like Figure 15A As shown, a passage may be formed in the inner peripheral wall 132B of the adjustment ring 126B of the scroll compressor according to the third embodiment of the present disclosure, and the passage may be provided with a first valve 300 capable of selectively opening or closing the passage. Figure 15D As shown, the first valve 300 includes a valve housing 310 formed with a valve hole 340, and a spring 320 and a spherical seal 330 accommodated in the valve housing. The spring 320 applies a biasing force to the spherical seal 330 to bias the spherical seal against the valve hole. The spherical seal can move axially to selectively open or close the valve hole 340. Figure 15C As shown, the adjustment ring 126B also includes a second valve 400. One end of the second valve 400 is fixed to the stepped surface 120 of the fixed scroll, and the other end of the second valve is set as a free end and is arranged above the top surface of the adjustment ring 126B. The second valve 400 is suitable for selectively opening or closing the other end H2B of the second medium-pressure channel. Preferably, the second valve can be formed as an L-shaped elastic valve plate, and the corner portion of the L-shaped elastic valve plate covers the second medium-pressure port. This L-shaped valve plate design can reliably achieve the function of selectively opening or closing the second medium-pressure port in a limited installation space.

[0085] Similar to the scroll compressor 1 according to the first embodiment of the present disclosure, the adjustment ring 126B of the scroll compressor according to the third embodiment of the present disclosure moves axially between the first position and the second position to enable the scroll compressor to operate in a first capacity mode (e.g., full capacity mode, such as Figure 15A ) and a second capacity mode (e.g., a reduced capacity mode, such as Figure 16A In full capacity mode, fluid communication between the regulating passage and the suction pressure region is prevented. In reduced capacity mode, fluid communication between the regulating passage and the suction pressure region 106 is permitted to allow intermediate-pressure working fluid to pass from the intermediate compression chamber to the suction pressure region.

[0086] Reference Figures 15A-15D , the adjustment ring 126B is in the first axially downward position when the scroll compressor is in full capacity mode. Figure 15B and 15C As shown, the second valve 400 is located substantially flush with the step surface 120 of the hub portion, and the second valve 400 covers the second medium-pressure port H2B, preventing the fluid from flowing from the second medium-pressure port H2B into the back-pressure chamber. Figure 15A and 15D As shown, under the influence of a pressure differential, the first valve 300 in the adjustment ring moves the ball 330 upward, overcoming the bias of the spring 320, thereby opening the valve hole 340. At this point, fluid flows into the backpressure chamber through the first intermediate-pressure passage P1B. Specifically, during full-capacity mode, the first valve 300 in the adjustment ring connects the first intermediate-pressure passage P1B with the passageway in the inner circumferential wall of the adjustment ring 126B, while the second valve 400 closes the second intermediate-pressure port H2B. As a result, the first intermediate compression chamber is selectively in fluid communication with the backpressure chamber.

[0087] Reference Figures 16A-16D , the adjustment ring 126B is in the second axially upward position when the scroll compressor is in the reduced capacity mode. Figure 16B and 16C As shown, the free end of the second valve 400 is lifted upward relative to the stepped surface 120 by the action of the adjustment ring 126B, thereby opening the second intermediate-pressure port H2B, and fluid flows from the second intermediate-pressure port H2B into the back-pressure chamber 80. Because the working fluid is discharged to the suction pressure area through the adjustment passage during the reduced capacity mode, the pressure in the first intermediate compression chamber at this time is lower than the pressure in the first intermediate compression chamber during the full capacity mode. Therefore, during the reduced capacity mode, the upward fluid pressure applied to the spherical member 330 of the first valve 300 is insufficient to overcome the biasing force of the spring 320, and the spherical member 330 remains closed to the valve hole 340, thereby preventing fluid from flowing from the first intermediate compression chamber into the back-pressure chamber. In other words, during the reduced capacity mode, the first valve 300 of the adjustment ring opens the second intermediate-pressure port H2B, and the second intermediate compression chamber is selectively connected to the back-pressure chamber fluid.

[0088] The scroll compressor according to the third embodiment of the present disclosure is also capable of supplying a working fluid at a preferred pressure to the backpressure chamber when switching between full capacity mode and reduced capacity mode by selecting which of the first and second intermediate pressure ports is used to supply the working fluid to the backpressure chamber. In this way, a suitably high-pressure working fluid can be supplied to the backpressure chamber during reduced capacity mode to provide sufficient back pressure to force the fixed scroll 60B axially against the orbiting scroll 70, thereby ensuring proper sealing between the tip of the orbiting scroll 76 and the second end plate 64, and between the tip of the fixed scroll 66 and the first end plate 74. Furthermore, in full capacity mode, it is possible to ensure that the pressure of the working fluid in the backpressure chamber is not too high in full capacity mode, which ensures that the fixed and orbiting scrolls do not excessively clamp against each other. Excessive clamping of the fixed and orbiting scrolls 60B against each other would introduce excessive friction loads between the fixed and orbiting scrolls, which would result in increased wear, increased power consumption, and efficiency loss. Thus, the operation of the regulating assembly minimizes wear and improves the efficiency of the scroll compressor in both full capacity mode and reduced capacity mode.

[0089] Furthermore, the scroll compressor according to the third embodiment of the present disclosure can still provide sufficient backup pressure even when the scroll compressor capacity is very small, thereby enabling the scroll compressor capacity to be varied over a wider range while still ensuring the provision of an optimal back pressure. Furthermore, the scroll compressor according to the third embodiment of the present disclosure utilizes the same regulating assembly to simultaneously adjust the scroll compressor capacity and back pressure. Specifically, by simply controlling the movement of the regulating valve ring, both the scroll compressor capacity and back pressure can be adjusted simultaneously. This allows the scroll compressor to provide an appropriate back pressure in response to capacity changes in a structurally simple and highly reliable manner.

[0090] Although the present invention has been described with reference to exemplary embodiments, it should be understood that the present invention is not limited to the specific embodiments described and illustrated in detail herein, and that those skilled in the art may make various changes to the exemplary embodiments without departing from the scope defined by the claims. Furthermore, it should be understood that, without being limited to the specific examples described or illustrated herein, the technical features of the various embodiments may be combined, replaced, or omitted without conflicting technical solutions.

Claims

1. A scroll compressor comprising: an orbiting scroll (70) comprising a first end plate (74) and an orbiting scroll wrap (76) extending from the first end plate; a fixed scroll (60), the fixed scroll comprising a second end plate (64) and a fixed scroll (66) extending from the second end plate, the movable scroll and the fixed scroll meshing with each other to define a plurality of compression chambers between the movable scroll and the fixed scroll, wherein the compression chambers comprise a suction pressure compression chamber (92) communicating with a suction pressure region, a discharge pressure compression chamber (98) communicating with a discharge pressure region, and a plurality of intermediate compression chambers, the intermediate compression chambers comprising a first intermediate compression chamber (94) and a second intermediate compression chamber (96), the pressure of the second intermediate compression chamber being greater than the pressure of the first intermediate compression chamber; a back pressure chamber (80) provided on a side of the second end plate (64) opposite to the side where the fixed scroll is formed, the back pressure chamber being adapted to apply a back pressure for pushing the fixed scroll toward the movable scroll; and an adjustment assembly (50), The invention is characterized in that the regulating assembly is configured to be movable between a first position and a second position. When the regulating assembly is in the first position, the back-pressure chamber is in fluid communication with the first intermediate compression chamber and isolated from the second intermediate compression chamber. When the regulating assembly is in the second position, the back-pressure chamber is in fluid communication with the second intermediate compression chamber and isolated from the first intermediate compression chamber. The modulation assembly (50) is further configured to switch the scroll compressor between a first capacity mode and a second capacity mode lower than the first capacity mode, and wherein when the modulation assembly is in the first position, the scroll compressor is in the first capacity mode, and when the modulation assembly is in the second position, the scroll compressor is in the second capacity mode.

2. The scroll compressor according to claim 1, wherein: The adjustment assembly (50) includes an adjustment ring (126, 126A, 126B), the second end plate forming an adjustment passage (65) extending through the second end plate, the adjustment ring being movable relative to the second end plate (64) between a first position and a second position, wherein the adjustment ring contacts the second end plate (64) to close the adjustment passage, and the adjustment ring is spaced apart from the second end plate (64) in the second position, and the adjustment passage is in fluid communication with the suction pressure region.

3. The scroll compressor according to claim 2, wherein: A hub portion (68) is formed on a side of the second end plate (64) opposite to the fixed scroll, the hub portion (68) including a first annular portion (116) and a second annular portion (118), the outer diameter of the first annular portion (116) being larger than the outer diameter of the second annular portion (118), thereby forming a step surface (120) between the first annular portion and the second annular portion. The adjustment ring (126, 126A, 126B) surrounds the first annular portion (116) and is in sealing contact with the first annular portion, the back pressure chamber (80) is formed between the second annular portion (118) and the adjustment ring, the top of the back pressure chamber is sealed by the floating seal (73) and the bottom is defined by the step surface (120) and the top surface of the adjustment ring (126, 126A, 126B) facing the sealing float.

4. The scroll compressor according to claim 3, wherein: A first intermediate-pressure passage (P1), a second intermediate-pressure passage (P2) and a connecting passage (P3) are formed in the fixed scroll, wherein one end of the first intermediate-pressure passage (P1) is open to the first intermediate compression chamber and the other end (H1) of the first intermediate-pressure passage is open to the outer peripheral wall of the first annular portion (116), one end of the second intermediate-pressure passage (P2) is open to the second intermediate compression chamber and the other end (H2) of the second intermediate-pressure passage is open to the outer peripheral wall of the first annular portion (116), the other end (H1) of the first intermediate-pressure passage is axially spaced from the other end (H2) of the second intermediate-pressure passage, and one end of the connecting passage (P3) is open to the outer peripheral wall of the first annular portion and the other end of the connecting passage is open to the step surface (120).

5. The scroll compressor according to claim 4, wherein: A first seal (S1), a second seal (S2) and an air guide channel (135) are provided on the wall surface of the inner peripheral wall (132) of the adjustment ring, wherein the first seal is axially spaced apart from the second seal, and the air guide channel is axially located between the first seal and the second seal.

6. The scroll compressor according to claim 5, wherein: At the first position, the first sealing member (S1) opens the other end (H1) of the first intermediate-pressure channel and the second sealing member (S2) closes the other end (H2) of the second intermediate-pressure channel, and fluid flows from the first intermediate compression chamber (94) through the first intermediate-pressure channel (P1), the air guide channel (135), and the communication channel (P3) and into the back-pressure chamber; At the second position, the first seal (S1) closes the other end (H1) of the first medium-pressure channel and the second seal (S2) opens the other end (H2) of the second medium-pressure channel, and the fluid flows from the second intermediate compression chamber (96) through the second medium-pressure channel (P2), the air guide channel (135) and the connecting channel (P3) and flows into the back-pressure chamber.

7. The scroll compressor according to claim 3, wherein: A countersink (PH), a first intermediate-pressure passage (P1A), a second intermediate-pressure passage (P2A) and a connecting passage (P3A) are formed in the fixed scroll, wherein the countersink (PH) is formed in the second end plate (64) and opens toward the side of the second end plate (64) opposite to the fixed scroll, one end of the first intermediate-pressure passage (P1A) opens to the first intermediate compression chamber and the other end (H1A) of the first intermediate-pressure passage opens to the countersink (PH), one end of the second intermediate-pressure passage opens to the second intermediate compression chamber and the other end (H2A) of the second intermediate-pressure passage opens to the countersink (PH), the other end (H1A) of the first intermediate-pressure passage is axially spaced from the other end (H2A) of the second intermediate-pressure passage, one end (H3A) of the connecting passage (P3A) opens to the countersink and the other end (H4A) of the connecting passage opens to the back-pressure chamber.

8. The scroll compressor according to claim 7, wherein: The adjustment assembly also includes a piston (200) capable of moving integrally with the adjustment ring, the piston being disposed in the counterbore (PH), the piston forming a hollow fluid cavity (240) and a first air inlet hole (210), an air exhaust hole (220), and a second air inlet hole (230) extending from the fluid cavity to the outer surface of the piston, the first air inlet hole, the air exhaust hole, and the second air inlet hole being spaced apart from each other in the axial direction, the piston also including a recess (250) recessed inwardly from its outer surface, the air exhaust hole being at least partially disposed in the recess.

9. The scroll compressor according to claim 8, wherein: At the first position, the first air inlet hole (210) is aligned with the other end (H1A) of the first intermediate-pressure passage, and the second air inlet hole (230) is spaced apart from the other end (H2A) of the second intermediate-pressure passage; fluid flows from the first intermediate compression chamber into the fluid chamber (240) via the first intermediate-pressure passage (P1A), and flows from the exhaust hole (220) into the back-pressure chamber via the recess (250) and the communication passage (P3A); At the second position, the first air inlet hole (210) is spaced apart from the other end (H1A) of the first intermediate-pressure passage and the second air inlet hole (230) is aligned with the other end (H2A) of the second intermediate-pressure passage, and the fluid flows from the second intermediate compression chamber into the fluid chamber (240) via the second intermediate-pressure passage (P2A), and flows from the exhaust hole into the back-pressure chamber via the recess and the communicating passage.

10. The scroll compressor according to any one of claims 7 to 9, wherein: A pressure replenishing hole (PS) is also formed in the fixed scroll, connecting the counterbore (PH) to one of the intermediate compression chambers.

11. The scroll compressor according to any one of claims 8 to 9, wherein: The piston (200) is formed with a protrusion (260), and the counterbore (PH) is provided with a groove that matches the shape of the protrusion, and the protrusion is inserted into the groove to prevent the piston from rotating relative to the counterbore.

12. A scroll compressor according to claim 3, wherein the regulating channel (65) is fluidically connected to the first intermediate compression chamber and is constructed as a first intermediate-pressure channel suitable for fluidly connecting the first intermediate compression chamber with the back-pressure chamber, and a second intermediate-pressure channel (P2B) is also formed in the fixed scroll, one end of the second intermediate-pressure channel is open to the second intermediate compression chamber and the other end (H2B) of the second intermediate-pressure channel is open to the step surface (120).

13. The scroll compressor according to claim 12, wherein: The regulating assembly further comprises a first valve (300) and a second valve (400), the inner peripheral wall (132B) of the regulating ring (126B) is formed with a passage extending through the inner peripheral wall in an axial direction and aligned with the first medium-pressure channel, the first valve (300) is arranged in the passage and is capable of selectively opening or closing the passage, and the second valve (400) is suitable for selectively opening or closing the other end (H2B) of the second medium-pressure channel.

14. The scroll compressor according to claim 13, wherein: The first valve includes a valve housing (310) formed with a valve hole (340) and a spring (320) and a spherical seal (330) accommodated in the valve housing, wherein the spring is suitable for applying a biasing force to the spherical seal to cause the spherical seal to abut against the valve hole, and the spherical seal (330) is capable of axially moving to selectively open or close the valve hole (340).

15. The scroll compressor according to claim 13, wherein: One end of the second valve (400) is fixed to the step surface (120) and the other end of the second valve is set as a free end and is located above the top surface of the adjustment ring (126B).

16. The scroll compressor according to claim 15, wherein: The second valve is formed as an L-shaped elastic valve plate, and a corner portion of the L-shaped elastic valve plate covers the other end ( H2B) of the second medium-pressure channel.

17. The scroll compressor according to any one of claims 13 to 16, wherein: At the first position, the first valve (300) opens the passage and the second valve (400) closes the second intermediate-pressure passage (P2B), and fluid flows from the first intermediate compression chamber into the back-pressure chamber via the first intermediate-pressure passage and the passage; At the second position, the free end of the second valve (400) is lifted by the adjustment ring (126B) to open the second medium-pressure passage (P2B) and the first valve (300) closes the passage, so that the fluid in the second intermediate compression chamber flows into the back-pressure chamber via the second medium-pressure passage and the fluid in the first intermediate compression chamber flows to the suction pressure area via the first medium-pressure passage and the gap between the adjustment ring and the second end plate.

18. The scroll compressor according to any one of claims 2 to 9 and 12 to 16, wherein: The regulating assembly (50) further includes a support ring (128) and a regulating control valve, wherein the regulating ring (126) defines a cavity, the support ring (128) is sealingly disposed in the cavity to form a regulating control chamber (140), and the regulating control valve selectively connects the regulating control chamber to a lower pressure source or a higher pressure source fluid.

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