scroll compressor

Abstract

The present disclosure relates to a scroll compressor, comprising: an orbiting scroll and a fixed scroll, wherein a central compression chamber and a plurality of intermediate compression chambers are formed between the orbiting scroll and the fixed scroll, wherein a first recessed portion configured as a sealed chamber is formed on one side of an end plate of the fixed scroll, and a first channel and a second channel are further formed in the end plate of the fixed scroll, wherein the first channel selectively provides fluid communication between at least one first intermediate compression chamber and the sealed chamber, and the second channel selectively provides fluid communication between the sealed chamber and the suction pressure area of ​​the scroll compressor, wherein a check valve is provided in the sealed chamber, and a valve plate of the check valve can simultaneously cover a first opening of the first channel located in the sealed chamber and a second opening of the second channel located in the sealed chamber, so as to synchronously open or close both the first channel and the second channel. The scroll compressor according to the present disclosure can achieve capacity regulation, has a simple structure, good performance, and reliable operation.

Description

Technical Field

[0001] The present invention relates to a scroll compressor, and more particularly, to a scroll compressor with a capacity adjustment mechanism. Background Art

[0002] The contents in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] As is known, scroll compressors are volumetric compression machines. The compression assembly of a scroll compressor includes a scroll member consisting of a fixed scroll component and an orbiting scroll component. Typically, the fixed scroll component and the orbiting scroll component each include scroll blades of a single profile. The two scroll blades cooperate (or meshingly engage) with each other to form a series of compression chambers between the fixed scroll component and the orbiting scroll component, thereby compressing the working medium (such as gaseous refrigerant). The compressed high-pressure gas is then discharged through an exhaust port in the center of the fixed scroll.

[0004] Depending on the working conditions, a scroll compressor can change the working capacity of the compressor in a variety of ways, such as changing the compressor speed and / or unloading the scroll member. In addition, a mechanism is also known that achieves capacity adjustment without changing the compressor speed and without unloading the scroll member. The mechanism includes an annular ring, a seal, a spacer, an electromagnetic valve and other components. The annular ring, the seal and the spacer form a sealed cavity. The electromagnetic valve controls the sealed cavity to communicate with a higher pressure area or a lower pressure area in the compressor. The pressure difference between the upper and lower sides of the annular ring can be controlled, so that the annular ring moves up and down to open or close a pressure relief hole provided on the fixed scroll component and connected to at least one intermediate compression chamber. When the pressure relief hole is open, the profile of the front part of the scroll mechanism does not participate in compression, thereby achieving the purpose of variable capacity.

[0005] While this capacity adjustment mechanism offers cost advantages over variable frequency drives and better overall energy efficiency than fixed frequency drives, it still has drawbacks, such as a complex structure, numerous parts, numerous sealing surfaces that are prone to leakage, and a high fixed scroll hub that makes casting difficult.

[0006] Therefore, there is a need for further improvement of the capacity adjustment mechanism of the scroll compressor. Summary of the Invention

[0007] One object of the present disclosure is to provide a scroll compressor with a novel capacity adjustment mechanism, which can achieve capacity adjustment without changing the compressor speed and / or unloading the scroll mechanism, wherein the capacity adjustment mechanism mainly includes a check valve, which can replace known components such as annular rings, seals and spacers, thereby having a simpler structure, fewer parts, fewer sealing surfaces, lower leakage risk, and easier installation and manufacturing.

[0008] Another object of the present disclosure is to make the structure of the capacity adjustment mechanism more compact and further optimize the space design inside the scroll compressor, especially at the fixed scroll component.

[0009] Another object of the present disclosure is to improve the sealing performance of the check valve of the capacity adjustment mechanism and to reduce the closing response time of the check valve, thereby ensuring smooth switching of the capacity adjustment mechanism between partial capacity mode and full capacity mode.

[0010] Another object of the present disclosure is to provide a scroll compressor with a novel capacity adjustment mechanism, wherein the capacity adjustment mechanism can be combined with frequency conversion technology, thereby increasing the ratio of the maximum displacement to the minimum displacement of the compressor, expanding the range of the compressor frequency conversion, and at the same time making the compressor perform better when operating at partial capacity and obtaining better lubrication conditions.

[0011] According to one aspect of the present disclosure, a scroll compressor is provided, comprising: a movable scroll, the movable scroll including a first end plate and a first scroll blade formed on the first end plate; a fixed scroll, the fixed scroll having a second end plate and a second scroll blade formed on a first side of the second end plate, the first scroll blade and the second scroll blade being engaged with each other to form a central compression chamber and a plurality of intermediate compression chambers between the movable scroll and the fixed scroll, wherein the second end plate is formed with a first recess configured as a sealed chamber on a second side opposite to the first side, and a first channel and a second channel are also formed in the second end plate, the first channel being configured to selectively provide fluid communication between at least one first intermediate compression chamber of the plurality of intermediate compression chambers and the sealed chamber, the second channel being configured to selectively provide fluid communication between the sealed chamber and a suction pressure area of ​​the scroll compressor, the first channel including a first opening located in the sealed chamber, the second channel including a second opening located in the sealed chamber, a check valve being provided in the sealed chamber, the valve plate of the check valve being able to simultaneously cover the first opening and the second opening to synchronously open or close both the first channel and the second channel.

[0012] Optionally, a third channel is provided in the second end plate, the third channel is connected to the sealing chamber fluid and the third channel is connected to a solenoid valve capable of switching between a first state and a second state. In the first state, the third channel connects the sealing chamber with the suction pressure zone fluid of the scroll compressor through the solenoid valve, thereby opening the valve plate of the check valve. In the second state, the third channel is closed by the solenoid valve or the third channel connects the sealing chamber with the high-pressure or medium-pressure zone fluid of the scroll compressor through the solenoid valve, thereby closing the valve plate of the check valve.

[0013] Optionally, a hub is formed in the center of the second side of the second end plate, and a fixed vortex central exhaust channel connected to the exhaust port fluid of the fixed vortex is formed in the hub. A hole is also formed in the hub, and the hole connects the sealing chamber with the fixed vortex central exhaust channel fluid. The cross-sectional area of ​​the hole is smaller than the cross-sectional area of ​​the third channel.

[0014] Optionally, a fourth channel is provided in the second end plate, and the fourth channel is fluidically connected to the central compression chamber or the fourth channel is fluidically connected to a second intermediate compression chamber among the plurality of intermediate compression chambers, wherein the pressure of the second intermediate compression chamber is higher than the pressure of the first intermediate compression chamber, and the fourth channel is connected to the solenoid valve. In the first state, the fourth channel is closed by the solenoid valve, and in the second state, the fourth channel is fluidically connected to the third channel through the solenoid valve.

[0015] Optionally, the scroll compressor includes a cover plate arranged on the second side of the second end plate, the cover plate covering the first recess to form the sealed cavity.

[0016] Optionally, a second recess is formed on the second side of the second end plate, the second recess is configured as a back pressure chamber of the fixed scroll, the first recess is formed below the second recess in the axial direction, and the scroll compressor includes a sealing spacer plate, which covers the first recess to form a sealed chamber.

[0017] Optionally, the sealed chamber is configured as a first chamber and a second chamber spaced apart from each other and arranged on both sides of the axis of the fixed scroll, and the first chamber and the second chamber are fluidically connected via a channel formed on the second end plate.

[0018] Optionally, the valve plate of the check valve includes a first end and a second end, the first end and the second end are connected by a connecting portion, the first end is fixed to the second end plate, and the second end selectively opens or closes the first opening and the second opening.

[0019] Optionally, the check valve includes a baffle located above the valve disc, and through holes are provided at positions of the baffle corresponding to the first opening and the second opening below the valve disc.

[0020] Optionally, in the sealing cavity, the second end plate is formed with a boss portion surrounding the first opening and the second opening, and the valve plate can contact the boss portion to seal the first opening and the second opening.

[0021] Optionally, within the sealed cavity, the second end plate is formed with a sink surrounding the first opening and spaced apart from the first opening, the sink being in fluid communication with the second opening and not in fluid communication with the first opening.

[0022] Optionally, the first channel includes an eccentrically arranged first channel section and a second channel section, the first channel section is connected to the sealing chamber, the second channel section is connected to at least one first intermediate compression chamber, and the second channel section is constructed as a plurality of channels distributed roughly along the vortex line.

[0023] According to the present disclosure, the scroll compressor adopts a new capacity adjustment mechanism including a check valve, which can achieve capacity adjustment without changing the compressor speed and / or unloading the scroll mechanism. It has a simple structure, high reliability, rapid response, easy installation and manufacturing, is suitable for vertical compressors and horizontal compressors, and has good performance and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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:

[0025] Figure 1 is an exploded perspective view of a capacity adjustment mechanism of a scroll compressor according to a first embodiment of the present disclosure;

[0026] Figure 2 is a longitudinal sectional view of a capacity adjustment mechanism of a scroll compressor according to a first embodiment of the present disclosure;

[0027] Figure 3 is a partially cutaway perspective view of a fixed scroll of a scroll compressor according to a first embodiment of the present disclosure;

[0028] Figure 4 1 is a top view of a valve plate of a check valve of a capacity adjustment mechanism of a scroll compressor according to a first embodiment of the present disclosure;

[0029] Figure 5 is an exploded perspective view of a capacity adjustment mechanism of a scroll compressor according to a second embodiment of the present disclosure;

[0030] Figure 6 is a top view of a capacity adjustment mechanism of a scroll compressor according to a second embodiment of the present disclosure, wherein a cover plate of the capacity adjustment mechanism is removed;

[0031] Figure 7 is a bottom view of a fixed scroll of a scroll compressor according to a second embodiment of the present disclosure;

[0032] Figure 8a and Figure 8b 1 are longitudinal cross-sectional views of a fixed scroll of a scroll compressor according to a second embodiment of the present disclosure taken in different directions, respectively showing a third passage in the fixed scroll end plate connecting the sealing chamber with the solenoid valve and a fourth passage connecting the solenoid valve with the second intermediate compression chamber of the scroll compressor;

[0033] Figure 9 is an exploded perspective view of a capacity adjustment mechanism of a scroll compressor according to a third embodiment of the present disclosure;

[0034] Figure 10 is a longitudinal sectional view of a capacity adjustment mechanism of a scroll compressor according to a third embodiment of the present disclosure;

[0035] Figure 11 is a top view of a capacity adjustment mechanism of a scroll compressor according to a third embodiment of the present disclosure, wherein a floating seal of the back pressure chamber is removed and various passages and openings in the fixed scroll end plate are depicted in perspective with dotted lines;

[0036] Figure 12a and Figure 12b They are partial longitudinal cross-sectional views of a fixed scroll of a scroll compressor according to a third embodiment of the present disclosure along different directions, mainly showing a check valve, a first channel, a second channel and an opening thereof;

[0037] Figure 13 FIG1 is a partial perspective view of a fixed scroll of a scroll compressor according to a third embodiment of the present disclosure, mainly showing the structure of a check valve installation position;

[0038] Figure 14 is a perspective view of a check valve of a capacity adjustment mechanism of a scroll compressor according to a third embodiment of the present disclosure;

[0039] Figure 15a and Figure 15b A perspective view and a longitudinal cross-sectional view are respectively a check valve of a capacity adjustment mechanism of a scroll compressor according to a first modified example of the present disclosure;

[0040] Figure 15c A longitudinal sectional view of a check valve of a capacity adjustment mechanism of a scroll compressor according to a second modified example of the present disclosure;

[0041] Figure 16 is an exploded perspective view of a capacity adjustment mechanism of a scroll compressor according to a comparative example of the present disclosure;

[0042] Figure 17 is a longitudinal sectional view of a capacity adjustment mechanism of a scroll compressor according to a comparative example of the present disclosure; and

[0043] Figure 18 for Figure 17 A detailed enlarged view of the sealing chamber portion of the medium capacity adjustment mechanism. DETAILED DESCRIPTION

[0044] Example embodiments will now be described more fully with reference to the accompanying drawings.

[0045] Exemplary embodiments are provided so that this disclosure will be exhaustive and will more fully convey the scope to those skilled in the art. Many specific details, such as examples of specific components, devices, and methods, are described to provide a thorough understanding of the various embodiments of the present disclosure. It will be clear to those skilled in the art that specific details need not be employed, and that the exemplary embodiments can be implemented in many different forms and should not be construed as limiting the scope of the present disclosure. In some exemplary embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.

[0046] Refer to the following Figure 1 The following describes the overall structure of a scroll compressor, particularly a scroll compressor capacity adjustment mechanism 100, according to a first embodiment of the present disclosure. Generally, a scroll compressor includes a scroll mechanism, a motor, a rotating shaft, a main bearing housing, and a housing defining an interior space for accommodating these components. The interior space of the housing defines a suction pressure region and a discharge pressure region.

[0047] The scroll mechanism includes a fixed scroll 120 and a movable scroll 110. The movable scroll 110 includes a movable scroll end plate and a movable scroll blade formed on one side of the movable scroll end plate. Figure 2 As shown, the fixed scroll 110 includes a fixed scroll end plate 122 and a fixed scroll blade 124 extending from one side (first side) of the fixed scroll end plate 122. The fixed scroll blade 124 and the movable scroll blade can engage with each other so that a series of compression chambers (including a central compression chamber and an intermediate compression chamber) are formed between the fixed scroll blade 124 and the movable scroll blade when the scroll compressor is running. The motor is configured to rotate the rotating shaft, and the rotating shaft drives the movable scroll 110 to orbit relative to the fixed scroll 120 (that is, the central axis of the movable scroll moves around the central axis of the fixed scroll, but the movable scroll does not rotate around its central axis). The working fluid enters the scroll mechanism from the suction pressure area, and after being compressed by a series of compression chambers, it is discharged from the exhaust port 129 in the center of the fixed scroll end plate 122 and discharged to the exhaust pressure area.

[0048] To achieve capacity adjustment, the scroll compressor also includes a capacity adjustment mechanism 100 located roughly on the side (second side) of the fixed scroll end plate 122 opposite the fixed scroll blades 124. This capacity adjustment mechanism 100 primarily comprises a solenoid valve 170, a check valve 150, a gasket 160, a cover plate 130, and a fixing member 180. The fixing member 180 is sequentially inserted through mounting holes 180 in the cover plate 130 and 180 in the gasket 160, and then into mounting holes 181 in the fixed scroll end plate 122. The gasket 160 and cover plate 130 are then sequentially secured to the second side of the fixed scroll end plate 122, thereby forming a sealed chamber C1 between the fixed scroll 120 and the cover plate 130. The check valve 150 is arranged in the sealed chamber C1. By opening and closing the check valve 150, the working fluid can be allowed to flow unidirectionally from at least one first intermediate compression chamber of the scroll mechanism through the sealed chamber C1 to the suction pressure area, so that part of the scroll profile does not participate in compression, thereby achieving the purpose of capacity regulation.

[0049] Specifically, see Figure 2 The generally circular cover plate 130 includes a cover plate end plate 133 and a cover plate hub 132 and a cover plate peripheral edge 134 formed on one side (first side) of the cover plate end plate 133. The cover plate hub 132 is located in the center of the cover plate 130, and the cover plate peripheral edge 134 is coaxially arranged around the cover plate hub 132, thereby forming an annular concave cavity 131 between the cover plate hub 132 and the cover plate peripheral edge 134. The floating seal 140 is arranged on the first side of the cover plate 130 and cooperates with the annular concave cavity 131 to form a back pressure chamber C2. The fixed scroll end plate 122 is formed with a fixed scroll hub 128 surrounding the exhaust port 129 on the second side of the fixed scroll end plate 122. The fixed scroll hub 128 defines a fixed scroll central exhaust channel C0 that is connected to the exhaust port 129 and is used to guide the compressed working fluid to the exhaust pressure area. The fixed scroll end plate 122 is further formed on its second side with a generally annular recess 126 surrounding a hub 128. By fixing the cover plate end plate 133 to the second side of the fixed scroll end plate 122 and inserting a gasket 160 corresponding to the shape of the surface of the second side of the fixed scroll end plate 122 between the cover plate end plate 133 and the fixed scroll end plate 122, a generally annular sealing chamber C1 can be formed between the cover plate end plate 133 and the fixed scroll end plate 122, which is jointly defined by the recess 126 and the cover plate end plate 133 and sealed by the gasket 160.

[0050] Those skilled in the art will understand that, although the sealing chamber C1 is shown in the figure as being formed by the recess 126 of the fixed vortex end plate 122 covered by the cover plate 130, the sealing chamber C1 may also be formed by the recess on the other side (the second side) of the cover plate end plate 133 opposite to the cover plate hub 132, or by the recess of the cover plate end plate 133 and the recess of the fixed vortex end plate 122 together.

[0051] See also Figure 2and Figure 3 , a first channel 121 and a second channel 123 are formed in the fixed scroll end plate 122. The opening at one end of the first channel 121 is arranged in at least one first intermediate compression chamber of the scroll mechanism, and the first opening 1211 at the other end is arranged in the sealed chamber C1, thereby providing fluid communication between at least one first intermediate compression chamber and the sealed chamber C1. The second opening 1231 at one end of the second channel 123 is arranged in the sealed chamber C1, and the opening at the other end is arranged at the outer surface of the fixed scroll end plate 122, thereby providing fluid communication between the sealed chamber C1 and the suction pressure area outside the fixed scroll 120. Figure 2 As shown, the first channel 121 can be constructed as a straight channel extending in the axial direction, and the second channel 123 can be constructed as a curved channel having a section extending in the axial direction and a section extending in the radial direction. In addition, the first channel can also be constructed as a channel formed by two eccentric channel sections (see Figure 12b , the first channel 321 is formed by connecting the eccentric first channel section 3215 and the second channel section 3213), so that the intermediate compression chamber closer to the radial inner side of the vortex can be connected to the sealing chamber, thereby expanding the range of capacity adjustment.

[0052] The first opening 1211 of the first channel 121 and the second opening 1231 of the second channel 123 are formed adjacent to each other on the bottom surface of the sealed cavity C1, and the valve plate 151 of the check valve 150 can cover the first opening 1211 and the second opening 1231 at the same time, thereby forming a more compact structure. Figure 2 and Figure 3 As shown, a boss 1221 extending axially from the bottom surface of the sealed cavity C1 can also be formed around the first opening 1211 and the second opening 1231, while the first opening 1211 and the second opening 1231 are formed on the top surface of the boss 1211. When the check valve 150 is closed, the valve plate 151 of the check valve abuts against the top surface of the boss 1221, thereby closing the first opening 1211 and the second opening 1231. Compared to forming the first opening 1211 and the second opening 1231 directly on the bottom surface of the sealed cavity C1, the boss design provides more installation space, making it easier for the check valve to mate with the opening of the channel, and also making it easier for the working fluid to be discharged from the scroll mechanism through the first and second channels.

[0053] In addition, a third channel 125 is also formed in the fixed scroll end plate 122. The third channel 125 can be constructed to extend roughly in the radial direction, with an opening at one end arranged in the sealed chamber C1, and the other end being connected to the solenoid valve 170 arranged on the outer peripheral side of the fixed scroll 120. The solenoid valve 170 has a control channel that can be connected to the suction pressure area of ​​the compressor. By switching the solenoid valve 170, the third channel 125 can selectively connect the sealed chamber C1 and the suction pressure area via the solenoid valve 170 (control channel). In addition, a channel 127 connecting the fixed scroll central exhaust channel C0 and the sealed chamber C1 is also formed in the hub 128 of the fixed scroll 120.

[0054] Refer to the following Figure 2 The capacity regulation process of a scroll compressor is described below. When the scroll compressor is operating at full capacity, solenoid valve 170 is closed, and third channel 125 is unable to connect sealed chamber C1 to the compressor's suction pressure zone via the control channel within solenoid valve 170, resulting in a closed state. However, sealed chamber C1 is connected to the fixed scroll central exhaust channel C0 via port 127. Some high-pressure working fluid enters sealed chamber C1 from fixed scroll central exhaust channel C0 via port 127. Consequently, the pressure within sealed chamber C1 is roughly equal to the pressure within fixed scroll central exhaust channel C0, and sealed chamber C1 is in a high-pressure state. At this time, because the pressure in the fixed scroll central exhaust passage C0 is greater than the pressure in the scroll member's intermediate compression chamber and even greater than the pressure in the suction pressure zone, the pressure above the check valve disc 151 (which may correspond to the pressure exerted on the disc by the working fluid in the sealing chamber C1) is greater than the pressure below the check valve disc 151 (which may correspond to the pressure exerted on the disc by the working fluid in the first and second passages 121, 123). Due to this pressure differential, the check valve disc 151 is pressed tightly against the first and second openings 1211, 1231, thereby simultaneously sealing both openings 1211, 1231. Check valve 150 closes the first and second passages 121, 123, preventing the working fluid in the first intermediate compression chamber from being discharged out of the scroll mechanism through the first and second passages 121, 123, and the scroll compressor thus operates at full capacity.

[0055] When the scroll compressor is operating at partial capacity, solenoid valve 170 is opened, and third passage 125 is opened, connecting sealed chamber C1 to the compressor's suction pressure zone via a control passage within solenoid valve 170. The high-pressure working fluid within sealed chamber C1 is discharged into the compressor's suction pressure zone via third passage 125 and the control passage within the solenoid valve, causing the pressure within sealed chamber C1 to rapidly decrease, reaching approximately the same level as the suction pressure zone. At this point, the pressure above check valve disc 151 is lower than the pressure below it. As a result, the pressure differential causes valve disc 151 to lift, simultaneously moving away from first opening 1211 and second opening 1231. Check valve 150 opens first passage 121 and second passage 123. The working fluid within the first intermediate compression chamber connected to first passage 121 is no longer gradually compressed toward the center of the scroll mechanism and discharged through exhaust port 129. Instead, it is discharged through first passage 121, sealed chamber C1, and second passage 123 to the suction pressure zone outside the scroll mechanism. That is to say, the scroll profile portion corresponding to the first intermediate compression chamber and the front portion of the scroll profile portion no longer participate in compression, and the scroll compressor therefore operates at partial capacity.

[0056] It should be noted that to rapidly reduce the pressure within sealed chamber C1 under partial capacity operating conditions, the cross-sectional area of ​​third passage 125 should be greater than that of aperture 127. Furthermore, to reduce leakage of the high-pressure working fluid within fixed scroll central exhaust passage C0 through aperture 127 under partial capacity operating conditions, the diameter of aperture 127 can be minimized, preferably less than 1 mm. Furthermore, a resistance device is preferably provided at aperture 127 to further reduce the leakage rate of the high-pressure working fluid.

[0057] It will be understood by those skilled in the art that two groups of first channels and second channels symmetrically arranged on both sides of the fixed scroll axis can be formed in the fixed scroll end plate, and two check valves 150 can be set in the sealing chamber C1 to cover the openings of the two groups of channels respectively, so that the scroll mechanism remains balanced under partial capacity operating conditions and full capacity operating conditions.

[0058] In addition, preferably, reference Figure 1 and Figure 4 In the present disclosure, the check valve 150 includes a valve plate 151 configured as an elongated cantilever beam and a baffle ( Figure 14). The first end of the valve disc 151 is formed as a mounting portion, which is provided with a valve disc mounting hole 1512. A fixing member such as a bolt passes through the baffle and the valve disc mounting hole 1512 to fix the check valve 150 to the bottom surface of the sealing chamber C1. The second end of the valve disc 151 is formed as a covering portion 1511. The mounting portion of the valve disc 151 and the covering portion 1511 (i.e., the first end and the second end) are connected by a connecting portion 1513. The size of the covering portion 1511 is configured to be sufficient to cover the first opening 1211 and the second opening 1231 at the same time. Due to the design of the valve disc in the form of an elongated cantilever beam, the opening resistance of the check valve 150 is small, and it can sensitively respond to pressure changes and open, thereby ensuring smooth switching from full-capacity working condition to partial-capacity working condition.

[0059] The following is through Figure 16 、 Figure 17 and Figure 18 The capacity adjustment mechanism of the scroll compressor of the comparative example is compared to illustrate the advantages of the first embodiment of the present disclosure. In the comparative example, the main components, installation method and working principle of the scroll compressor are similar to those of the first embodiment of the present disclosure, so they are not repeated here.

[0060] See also Figure 16 and Figure 17 According to the comparative example, the scroll compressor includes a scroll member consisting of a fixed scroll 20 and an orbiting scroll 10. The orbiting scroll 10 includes an orbiting scroll end plate and an orbiting scroll blade formed on one side of the orbiting scroll end plate. The fixed scroll 20 includes a fixed scroll end plate 22, a fixed scroll blade 24 extending from one side (a first side) of the fixed scroll end plate 22, and a fixed scroll hub 28 extending from the other side (a second side) of the fixed scroll end plate 22. The fixed scroll blade 24 and the orbiting scroll blade are capable of engaging with each other, so that when the scroll compressor is operating, a series of compression chambers (including a central compression chamber and an intermediate compression chamber) are formed between the fixed scroll blade 24 and the orbiting scroll blade. The working fluid is gradually compressed from the radial outer side to the center of the scroll member through the series of compression chambers and is discharged from the exhaust port 29 at the center of the fixed scroll end plate 22. Finally, it is discharged to the exhaust pressure area of ​​the scroll compressor through the fixed scroll central exhaust passage C0' surrounded by the fixed scroll hub 28 and connected to the exhaust port 29.

[0061] The scroll compressor according to the comparative example further includes a capacity adjustment mechanism 100' arranged on the side (second side) of the fixed scroll end plate 22 opposite to the fixed scroll blade 24. The capacity adjustment mechanism 100' mainly includes a solenoid valve 70, a partition plate 30, a U-shaped seal 60, an annular ring 50, and an inner seal 80. The partition plate 30, the U-shaped seal 60, the annular ring 50, and the inner seal 80 are sequentially mounted to the second side of the fixed scroll end plate 22 and are coaxially arranged around the fixed scroll hub 28. Figure 18The annular ring 50 includes an inner diameter portion 51 located radially inward and an outer diameter portion 52 located radially outward, wherein the inner diameter portion 51 extends substantially in the radial direction and is capable of contacting the surface of the second side of the fixed scroll end plate 22 (at Figure 17 The outer diameter portion 52 is formed as a recessed portion that is axially recessed relative to the inner diameter portion 51 in a direction away from the fixed scroll end plate 22. The partition plate 30 is arranged at the opening of the recessed portion formed by the outer diameter portion 52, and the U-shaped seal 60 is arranged between the partition plate 30 and the outer diameter portion 52, thereby forming a sealed cavity 26 in the recessed portion of the outer diameter portion 52. In addition, see Figure 17 The outer diameter portion 52 is further formed with a flange portion 53 extending axially away from the fixed scroll end plate 22. An annular space for accommodating the floating seal 40 is formed between the flange portion 53 and the fixed scroll hub 28, thereby forming a back pressure chamber 31 between the annular ring 50 and the fixed scroll hub 28, which is enclosed by the floating seal 40, the outer diameter portion 52 of the annular ring 50, the inner diameter portion 51 of the annular ring 50, and the fixed scroll hub 28. An inner seal 80 is disposed within the back pressure chamber 31 between the inner diameter portion 51 and the fixed scroll hub 28 to seal the back pressure chamber 31. The back pressure chamber 31 is connected to at least one intermediate compression chamber in the series of compression chambers via a through hole formed in the fixed scroll 20 (the fixed scroll end plate 22 and / or the fixed scroll hub 28).

[0062] The fixed scroll end plate 22 includes a first passage 21 that communicates with at least one intermediate compression chamber C in a series of compression chambers. This intermediate compression chamber C is located radially closer to the outside of the fixed scroll than the intermediate compression chamber connected to the backpressure chamber 31. Furthermore, a solenoid valve 70, disposed on the outer periphery of the fixed scroll 20, can selectively connect the sealed chamber 26 to the backpressure chamber 31 or to the suction pressure region (the passage for connection is not shown). When the solenoid valve 70 controls the sealed chamber 26 to connect to the suction pressure region, the pressure within the sealed chamber 26 is less than the pressure outside the annular ring 50 (which may correspond to the combined pressure of the working fluid in the backpressure chamber 31 and the working fluid in the suction pressure region on the annular ring 50). Under the action of the pressure difference between the inside and outside, the annular ring 50 moves axially toward the fixed scroll end plate 22, causing the bottom surface 511 of the inner diameter portion 51 of the annular ring 50 to press against the opening 211 of the first passage 21 located on the second side of the fixed scroll end plate 22 to form a seal, thereby closing the first passage 21. At this time, the working fluid in the intermediate compression chamber C cannot flow out, and the scroll compressor operates at full capacity. When the solenoid valve 70 controls the sealing chamber 26 to communicate with the back pressure chamber 31, the pressure in the sealing chamber 26 is greater than the pressure outside the annular ring 50. Under the action of the pressure difference between the inside and the outside, the annular ring 50 moves axially in the direction away from the fixed scroll end plate 22, so that the bottom surface 511 of the inner diameter portion 51 of the annular ring 50 leaves the opening 211 of the first channel 21, and the first channel 21 is opened. At this time, the working fluid in the intermediate compression chamber C is discharged to the suction pressure area through the first channel 21 and its opening 211. At this time, the vortex profile portion corresponding to the intermediate compression chamber C and the front part of the vortex profile portion no longer participate in compression, and the scroll compressor therefore operates at partial capacity.

[0063] Compared with the first embodiment of the present disclosure, the capacity adjustment mechanism 100' in the comparative example includes more components such as the annular ring 50, which has a complex structure and high cost; the capacity adjustment mechanism 100' includes multiple seals such as a U-shaped seal 60 and an inner seal 80, which need to form seals on multiple surfaces, and because the annular ring 50 moves axially under the action of the pressure difference, several seals including the U-shaped seal 60 and the inner seal 80 are moving friction pairs, which are prone to leakage and have low reliability; in addition, multiple components of the capacity adjustment mechanism 100' are installed around the fixed scroll hub 28 and require a certain axial installation space, so the fixed scroll hub 28 needs to be manufactured with a larger axial length, which also brings certain difficulties to the casting of the fixed scroll.

[0064] The capacity adjustment mechanism 100 in the first embodiment of the present disclosure mainly controls whether the first intermediate compression chamber is connected to the suction pressure zone through the check valve 150, and has a simpler structure and low manufacturing cost. Since moving components such as the annular ring 150 are no longer required, multiple seals, especially the use of moving friction pairs, are omitted. Only the static sealing surface of the check valve 150 exists, which reduces the risk of leakage and improves reliability. In addition, the casting difficulty of the fixed scroll is reduced, and installation is easier. The capacity adjustment mechanism according to the present disclosure can be used not only for vertical scroll compressors as shown in the figure, but also for horizontal scroll compressors. It has a wide range of applications and good adaptability. It is particularly important that in the present disclosure, the valve plate of the check valve 150 covers both the first opening and the second opening at the same time. Compared with the technical solution in which the valve plate only covers the first opening and the second opening is arranged outside the valve plate, since the suction pressure is always maintained under the valve plate, it is more conducive to the sealing of the valve plate. Moreover, compared with the technical solution in which the second opening is arranged outside the valve plate and is always kept exposed, in the technical solution disclosed in the present invention, under the full-capacity normal operating condition, high pressure is maintained in the sealing chamber C1, and the high-pressure fluid therein will not leak through the second opening, thereby improving the performance of the compressor; or compared with the technical solution in which the second opening is arranged outside the valve plate and an additional sealing component is provided, in the technical solution disclosed in the present invention, the additional layout for sealing the second channel and its second opening is omitted, and the same valve plate is used to seal both the first opening and the second opening, thereby further simplifying the structure and reducing the production and installation costs.

[0065] Figure 5 The scroll compressor according to the second embodiment of the present disclosure, in particular the overall structure of the scroll compressor capacity adjustment mechanism 200 is shown. In the second embodiment, the main components, installation method and working principle of the scroll compressor are similar to those of the first embodiment of the present disclosure, and therefore are not described in detail.

[0066] like Figure 5 As shown, in the second embodiment, the scroll compressor includes a scroll mechanism consisting of an orbiting scroll 210 and a fixed scroll 220, and a capacity adjustment mechanism 200 located on the side of the fixed scroll 220 opposite the orbiting scroll 210. The capacity adjustment mechanism 200 mainly includes a solenoid valve 270, a check valve 250, a gasket 260, a cover plate 230, and a fixed member 280 (a floating seal is not shown). The gasket 260 and the cover plate 230 are sequentially mounted to the fixed scroll 220 by sequentially passing the fixed member 280 through the mounting hole in the cover plate 230, the mounting hole 282 in the gasket 260, and then inserting it into the mounting hole 281 in the fixed scroll end plate.

[0067] See also Figure 5 and Figure 6, the end plate of the fixed scroll 220 is formed with a fixed scroll hub 228 surrounding the central exhaust port 229 of the fixed scroll 220 on its side (second side) opposite to the fixed scroll blade, and the fixed scroll hub 228 defines a fixed scroll central exhaust channel C0 connected to the exhaust port 229 for guiding the compressed working fluid to the exhaust pressure area. The fixed scroll end plate 122 is also formed with a roughly annular recess 226 surrounding the fixed scroll hub 228 on its second side. By fixing the cover plate 230 to the second side of the fixed scroll end plate and inserting the gasket 260 between the cover plate 230 and the fixed scroll 220, a sealed cavity C1 (such as ) defined by the recess 226 and the cover plate 230 and sealed by the gasket 260 can be formed between the cover plate 230 and the fixed scroll end plate 230. Figure 8a and Figure 8b See Figure 6 and Figure 7 , a first channel 221 capable of connecting at least one first intermediate compression chamber in a series of compression chambers with the sealed chamber C1 and a second channel (not shown in the figure) connecting the sealed chamber C1 with the suction pressure area of ​​the compressor are formed on the fixed scroll end plate. The check valve 250 can simultaneously cover the opening of the first channel 221 in the sealed chamber C1 and the opening of the second channel in the sealed chamber C1, thereby synchronously opening or closing the first channel 221 and the second channel. The arrangement of the first channel, the second channel and the check valve is similar to that of the first embodiment and will not be repeated here. Although the floating seal and the back pressure chamber of its structure are not shown in the figure, Figure 6 and Figure 7 A back pressure hole 242 is shown in the figure for connecting to a certain intermediate compression chamber to maintain the intermediate pressure of the back pressure chamber. The back pressure hole 242 can axially pass through the fixed scroll end plate and the fixed scroll hub 228 and extend to the back pressure chamber above the cover plate 230.

[0068] Different from the first embodiment, the scroll compressor according to the second embodiment of the present disclosure omits the channel connecting the fixed scroll central exhaust channel C0 and the sealed chamber C1, and instead uses high pressure or medium pressure introduced from the central compression chamber or the second intermediate compression chamber to the sealed chamber C1 to realize the opening and closing of the check valve 250.

[0069] See also Figure 8a and Figure 8b, a third channel 2251 and a fourth channel 2252 are also formed in the end plate of the fixed scroll 220. The third channel 2251 can be constructed to extend radially, or it can be composed of two mutually connected channels extending axially and radially. The opening at one end of the first channel 2251 is arranged in the sealed chamber C1, and the opening at the other end is connected to the solenoid valve 270 arranged on the outer peripheral side of the fixed scroll 220. The fourth channel 2252 can be constructed to include a channel 244 extending axially and a channel extending radially connected to the channel 244. The opening at one end of the fourth channel 2252 is arranged in a second intermediate compression chamber or a central compression chamber (that is, the channel 244 is connected to a second intermediate compression chamber or a central compression chamber), and the opening at the other end is connected to the solenoid valve 270. In addition, in order to ensure that the pressure in the sealed chamber C1 is moderate during the operation of the capacity adjustment mechanism 200 and facilitate the closing of the solenoid valve 270, the second intermediate compression chamber connected to the orifice 244 can be closer to the center of the fixed scroll than the first intermediate compression chamber connected to the first channel 221, that is, the pressure of the second intermediate compression chamber connected to the orifice 244 is higher than the pressure of the first intermediate compression chamber connected to the first channel 221. The solenoid valve 270 has a control channel that can be connected to the suction pressure area of ​​the compressor or to the fourth channel 2252. By switching the solenoid valve 270, the third channel 2251 can connect the sealed chamber C1 with the suction pressure area via the solenoid valve 270 (control channel), or connect the sealed chamber C1 with the second intermediate compression chamber or the central compression chamber via the solenoid valve 270 (control channel) and the fourth channel 2252. The solenoid valve 270 is constructed as a two-position three-way valve, that is, when the solenoid valve 270 is switched to a state where the third channel 2251 is connected to the suction pressure zone, the fourth channel 2252 is in a closed state; when the solenoid valve 270 is switched to a state where the third channel 2251 is connected to the fourth channel 2252, neither the third channel 2251 nor the fourth channel 2252 is connected to the suction pressure zone.

[0070] Specifically, when the scroll compressor is operating at full capacity, solenoid valve 270 switches to connect third channel 2251 with fourth channel 2252. A portion of the working fluid in the central compression chamber or the second intermediate compression chamber enters fourth channel 2252 from the opening of orifice 244 and flows into sealed chamber C1 through the control channel and third channel 2251 within solenoid valve 270. Consequently, the pressure in sealed chamber C1 is substantially equal to the pressure in the central compression chamber or the second intermediate compression chamber, and sealed chamber C1 is in a high-pressure or medium-pressure state. At this point, the pressure above the valve disc of check valve 250 (which may correspond to the pressure exerted on the valve disc by the working fluid in sealed chamber C1) is greater than the pressure below the valve disc (which may correspond to the pressure exerted on the valve disc by the working fluid in first channel 221 and second channel). Due to the pressure differential, the valve disc is pressed against the openings of first channel 221 and second channel, thereby simultaneously sealing both openings. The check valve closes the first channel 221 and the second channel, and the working fluid in the first intermediate compression chamber cannot be discharged out of the scroll mechanism through the first channel 221 and the second channel. Therefore, the scroll compressor operates at full capacity.

[0071] When the scroll compressor is operating at partial capacity, solenoid valve 270 switches to connect third channel 2251 to the suction pressure zone. The high- or medium-pressure working fluid in sealed chamber C1 is discharged to the compressor's suction pressure zone via third channel 2251 and the control channel within solenoid valve 270. This causes the pressure in sealed chamber C1 to rapidly decrease, reaching approximately the same level as the suction pressure zone. At this point, the pressure above the valve disc of check valve 250 is lower than the pressure below it. As a result, the valve disc is lifted by the pressure differential, simultaneously moving away from the openings of first channel 221 and second channel 221. Check valve 250 opens first channel 221 and second channel 229. Instead of being gradually compressed to the center of the scroll mechanism and discharged through exhaust port 229, the working fluid in the first intermediate compression chamber connected to first channel 221 is discharged outside the scroll mechanism via first channel 221, sealed chamber C1, and second channel 229. In other words, the scroll profile corresponding to the first intermediate compression chamber and the front portion of the scroll profile no longer participate in compression, allowing the scroll compressor to operate at partial capacity.

[0072] The second embodiment according to the present disclosure not only has advantages similar to those of the first embodiment, such as a simpler capacity adjustment mechanism structure, easier manufacturing and installation, low manufacturing cost, and high reliability, but also because when the sealed chamber C1 is connected to the suction pressure zone via the solenoid valve, the fourth channel connected to the second intermediate compression chamber or the central compression chamber is in a closed state, so the working fluid in the second intermediate compression chamber or the central compression chamber will not leak unnecessary fluid via the solenoid valve, thereby further improving the performance of the compressor.

[0073] Figure 9The scroll compressor according to the third embodiment of the present disclosure, in particular the overall structure of the scroll compressor capacity adjustment mechanism 300 is shown. In the third embodiment, the main components, installation method and working principle of the scroll compressor are similar to those of the first embodiment of the present disclosure, and therefore are not described in detail.

[0074] like Figure 9 As shown, in the third embodiment, the scroll compressor includes a scroll mechanism consisting of an orbiting scroll 310 and a fixed scroll 320, and a capacity adjustment mechanism 300 located on the side of the fixed scroll 320 opposite the orbiting scroll 310. The capacity adjustment mechanism 300 mainly includes a solenoid valve 370, a check valve 350, a gasket 360, a sealing spacer 330, and a fixing member 380. The gasket 360 and the sealing spacer 330 are sequentially mounted to the fixed scroll 320 by sequentially passing the fixing member 380 through the mounting hole 383 in the sealing spacer 330, the mounting hole 382 in the gasket 360, and then inserting it into the mounting hole 381 in the fixed scroll end plate.

[0075] Different from the first embodiment, the sealed chamber C1 of the capacity adjustment device of the scroll compressor according to the third embodiment of the present disclosure is embedded below the back pressure chamber C2 in the axial direction. Figure 10 The fixed scroll end plate 322 is formed with a fixed scroll hub 328 surrounding the central exhaust port on the side (second side) of the fixed scroll end plate 322 opposite the fixed scroll blades 324. The fixed scroll end plate 322 is also formed with a generally annular recess 326 surrounding the hub 328 on its second side. The bottom of the recess 326 is further recessed to form a sunken recess 327 for defining the sealed chamber C1. The sunken recess 327 is configured to have a shape corresponding to the shape of the check valve 350. A step 331 is formed at the junction of the sunken recess 327 and the recess 326 for supporting the gasket 360 and the sealing spacer 330. After the gasket 360 and the sealing spacer 330 are installed in place on the step 331, the gasket 360 and the sealing spacer 330 cover the sunken recess 327, thereby defining the sealed chamber C1 together with the sunken recess 327. After the floating seal 340 is installed in the recess 326, it, together with the recess 326 and the sealing spacer 330, defines a back-pressure chamber C2. Thus, in the third embodiment, the back-pressure chamber C2 and the sealing chamber C1 are integrally formed in the fixed scroll end plate 322, with the sealing chamber C1 closer to the fixed scroll blades 324 and the back-pressure chamber C2 further away from the fixed scroll blades 324. Furthermore, in the third embodiment, the sealing spacer 330 and gasket 360 are configured to match the shape and size of the sunken recess 327, allowing them to be installed from within the recess 326 onto the stepped portion 331 to form the sealing chamber C1.

[0076] In the third embodiment according to the present disclosure, due to the integrated design of the sealing chamber C1 and the back pressure chamber C2, the sealing chamber C1 is formed below the back pressure chamber C2 in the axial direction, which not only further simplifies the structure and makes it easier to manufacture and install, but also further improves the reliability.

[0077] See also Figure 11 In the third embodiment, the number of sealed chambers C1 corresponds to the number of check valves 350. The two sealed chambers C1 are respectively arranged on either side of the axis of the fixed scroll and can be connected via a channel 3226 formed at the bottom of the recess 326 of the fixed scroll end plate 322. The two sealed chambers C1 and the channel 3226 connecting the two sealed chambers C1 are isolated from the back pressure chamber C2 by a sealing spacer 330 and a gasket 360. Thus, through a solenoid valve 370, a third channel 3251 connecting the solenoid valve 370 to the sealed chamber C1, and a fourth channel 3252 connecting a second intermediate compression chamber or a central compression chamber to the solenoid valve 370, it is possible to simultaneously control the pressure of the two sealed chambers C1, thereby synchronously opening or closing the check valves 350 located in the two sealed chambers C1. When check valve 350 is open, a first intermediate compression chamber, one of the compression chambers, can enter sealed chamber C1 through first channel 321 provided in fixed scroll end plate 322 and be discharged out of the scroll mechanism through second channel 323. Third channel 3251 and fourth channel 3252 and their associated configurations are similar to third channel 2251 and fourth channel 2252 in the second embodiment. First channel 321 and second channel 323 and their associated configurations are similar to first channel 121 and second channel 123 in the first embodiment, and are not further described here.

[0078] When the scroll compressor is operating at full capacity, solenoid valve 370 switches to connect third channel 3251 with fourth channel 3252. A portion of the working fluid in the central compression chamber or the second intermediate compression chamber flows into sealed chamber C1 via fourth channel 3252 and the control channel within solenoid valve 370 and third channel 3251. Consequently, the pressure within sealed chamber C1 becomes approximately equal to that of the central compression chamber or the second intermediate compression chamber, placing sealed chamber C1 at high or medium pressure. At this point, the pressure above the valve disc of check valve 350 (which may correspond to the pressure exerted on the valve disc by the working fluid in sealed chamber C1) is greater than the pressure below the valve disc (which may correspond to the pressure exerted on the valve disc by the working fluid in first channel 321 and second channel 323). Due to this pressure differential, the valve disc is pressed against the first opening 3211 of the first channel 321 within sealed chamber C1 and the second opening 3231 of the second channel 323 within sealed chamber C1, thereby simultaneously sealing the first opening 3211 and the second opening 3231. The check valve closes the first channel 321 and the second channel 323 , and the working fluid in the first intermediate compression chamber cannot be discharged out of the scroll mechanism through the first channel 321 and the second channel 323 . Therefore, the scroll compressor operates at full capacity.

[0079] When the scroll compressor is operating at partial capacity, solenoid valve 370 switches to connect third channel 3251 to the suction pressure zone. The high-pressure or medium-pressure working fluid in sealed chamber C1 is discharged to the compressor's suction pressure zone via third channel 3251 and the control channel within solenoid valve 370, causing the pressure in sealed chamber C1 to rapidly decrease, reaching approximately the same level as the suction pressure zone. At this point, the pressure above the valve disc of check valve 350 is lower than the pressure below it. Therefore, the valve disc is lifted by the pressure differential, simultaneously moving away from first opening 3211 and second opening 3231. Check valve 350 opens first channel 321 and second channel 323. The working fluid in the first intermediate compression chamber connected to first channel 321 is no longer gradually compressed to the center of the scroll mechanism and discharged through exhaust port 329. Instead, it is discharged outside the scroll mechanism via first channel 321, sealed chamber C1, and second channel 323. That is, the scroll profile portion corresponding to the first intermediate compression chamber communicating with the first channel 321 and the front portion of the scroll profile portion no longer participate in compression, and the scroll compressor thus operates at partial capacity.

[0080] In addition, if Figure 12b As shown, the first channel 321 includes a first channel section 3215 and a second channel section 3213 that are eccentrically arranged with respect to each other. One end of the first channel section 3215 has a first opening 3211 arranged in the sealed cavity C1, and the other end is connected to the second channel section 3213. One end of the second channel section 3213 is connected to the first channel section 3215, and the other end is connected to the first intermediate compression chamber. Figure 12aAs shown, the second channel section 3213 can be constructed as a plurality of holes arranged in parallel, preferably distributed approximately along the vortex profile, while the first channel section 3215 can be constructed as an elongated hole extending approximately along the vortex profile. The second opening 3231 can be arranged radially outward from the first opening 3211, so that the first opening 3211 and the second opening 3231 are more compactly arranged below the valve plate of the check valve 350. Through this structural design, under partial capacity operating conditions, the working fluid in the first intermediate compression chamber can flow more and more quickly through the first opening 3211 and the second opening 3231 to the suction pressure area, making the fluid flow smoother and easier.

[0081] Preferably, see Figure 13 A recessed groove 3212 is formed between the second opening 3231 and the first opening 3211, communicating with the second opening 3231 but spaced apart from the first opening 3211. This recessed groove 3212 can be formed in a racetrack-like shape surrounding the first opening 3211, and its depth is preferably 0.5 mm to 1 mm. A spaced sealing surface 3213 formed by the bottom of the recessed recess 327 (sealed cavity C1) surrounding the first opening 3211 is formed between the recessed groove 3212 and the first opening 3211. When the check valve 350 is closed, the valve disc 351 covers the first and second openings 3211 and 3231. The bottom surface of the valve disc 351 contacts the spaced sealing surface 3213 and the sealing surface formed by the bottom of the recessed recess 327 (sealed cavity C1) around the second opening 3231 and the recessed groove 3212, thereby sealing the first and second openings 3211 and 3231. Since the sink groove 3212 reduces the area of ​​the sealing surface, the sealing pressure ratio of the valve plate is increased, making the sealing effect of the valve plate better and less prone to leakage; on the other hand, since the sink groove 3212 is connected to the second opening 3231, that is, the pressure in the sink groove 3212 can always be maintained consistent with the suction pressure zone. Under full-capacity working conditions, the design of the sink groove 3212 makes the pressure below the valve plate 351 lower and closer to the suction pressure, thereby increasing the upper and lower pressure difference of the valve plate 351 and improving the sealing performance of the valve plate.

[0082] Preferably, see Figure 14The check valve 350 includes a valve disc 351 and a baffle 352 positioned above the valve disc 351. One end of the valve disc 351 and one end of the baffle 352 each form a mounting portion, each provided with a mounting hole. A fixing member, such as a bolt 353, passes through the baffle mounting hole and the valve disc mounting hole and into the check valve mounting hole 3531 on the bottom surface of the sealed chamber C1, thereby securing the check valve 350 in place. The other end of the valve disc 351 forms a covering portion 3511 that can simultaneously cover the first opening 3211 and the second opening 3231. The baffle 352 also has a baffle through-hole 3521 at a position corresponding to the covering portion 3511. When the partial-capacity operating mode switches to the full-capacity operating mode, high-pressure or medium-pressure fluid enters the sealed chamber C1 via the fourth channel 3251 and the third channel 3252. Because baffle plate 352 is provided with baffle plate through-hole 3521, the high-pressure or medium-pressure fluid can more quickly and easily reach the top of valve disc 351. The pressure above valve disc 351 increases more quickly in response to the operating mode switch, causing valve disc 351 to close more quickly. Therefore, the opening design of baffle plate 352 can reduce the valve disc closing response time and ensure a smooth transition from partial-capacity to full-capacity operating mode.

[0083] The second embodiment of the present disclosure not only offers advantages similar to those of the first and second embodiments, such as a simpler capacity adjustment mechanism structure, easier manufacturing and installation, lower manufacturing costs, no unnecessary leakage, and higher reliability, but also features an integrated design of the sealing chamber and backpressure chamber, further simplifying the structure and improving reliability. Furthermore, the openings of the first opening, second opening, sink, and check valve baffle further enhance the sealing performance of the check valve and reduce its response time.

[0084] It will be understood by those skilled in the art that, although the check valves are shown as long cantilever beam structures in the first to third embodiments of the present disclosure, the check valves may also be constructed as other suitable structures as long as they can satisfy the requirement of one-way flow and complete the switching between partial capacity and full capacity operating conditions. For example, Figure 15a 、 Figure 15b 、 Figure 15c Different check valve structures are shown. Figure 15a 、 Figure 15bIn the first modified example shown, the check valve 450 is circular in shape and includes a valve mounting plate 454, a valve retainer 453, and a valve disc 451 located within the space enclosed by the mounting plate 454 and the valve retainer 453. The valve mounting plate 454 is fixed above the first and second openings within the sealed chamber C1. A valve mounting plate opening 4541 is centrally located within the valve mounting plate 454. The first and second openings can only be fluidically connected to the sealed chamber C1 through the valve mounting plate opening 4541. The valve retainer 453 is formed with multiple openings that communicate with the sealed chamber C1, such as a first arc-shaped valve retainer opening 4531 and a second circular valve retainer opening 4532. The valve disc 451 is generally circular, conforming to the shape of the valve mounting plate opening 4541. When the sealing chamber C1 is at high pressure or medium pressure, the valve disc 451 moves downward under the action of the pressure difference and presses against the valve mounting plate 454, sealing the valve mounting plate opening 4541 of the valve mounting plate 454, thereby closing the first opening and the second opening in the sealing chamber C1; when the sealing chamber C1 is at low pressure, the valve disc 451 moves upward under the action of the pressure difference and leaves the valve mounting plate opening 4541 of the valve mounting plate 454, thereby opening the first opening and the second opening in the sealing chamber C1.

[0085] The check valve in the first modified example is easier to manufacture and install, and can be used in conjunction with Figure 2 and Figure 3 The boss 1221 formed around the first opening and the second opening shown in the figure is used in combination to further reduce production costs.

[0086] Figure 15cA second variation of the check valve is shown. Similar to the first variation, the check valve 550 includes a valve mounting plate 554, a valve retainer 553, and a valve disc 551 located within the space enclosed by the valve mounting plate 554 and the valve retainer 553. However, a guide portion 5533 extending axially toward the valve mounting plate 554 is formed in the center of the valve retainer 553. The valve disc 551 includes an axially extending peripheral portion 5511 and a radially extending bottom plate portion 5512. The peripheral portion 5511 of the valve disc 551 is sleeved around the outer periphery of the guide portion 5533 and is capable of axially sliding relative to the guide portion 5533, allowing the valve disc 551 to move up and down axially under the guidance of the guide portion 5533. When the sealed chamber C1 is at high or medium pressure, the valve disc 551 moves downward under the action of the pressure differential, and the bottom plate portion 5512 of the valve disc 551 presses against the valve mounting plate 554, sealing the valve mounting plate opening 5541 of the valve mounting plate 554, thereby closing the first and second openings in the sealed chamber C1. When the sealed chamber C1 is at low pressure, the valve disc 551 moves upward under the action of the pressure differential, away from the valve mounting plate opening 5541 of the valve mounting plate 554, thereby opening the first and second openings in the sealed chamber C1. Compared to the first modified example, in which the valve disc 451 moves freely between the valve mounting plate and the valve retainer, the valve disc 551 moves under the guidance of the guide portion 5533 of the valve retainer 553, which can better control the movement and position of the valve disc and improve the sealing performance of the valve disc.

[0087] Those skilled in the art can also understand that the capacity regulation mechanism according to the present disclosure can be combined with frequency conversion technology, so that the maximum displacement and minimum displacement of the compressor are larger, the range of compressor frequency conversion is expanded, and at the same time, the compressor performs better when operating at partial capacity and obtains better lubrication conditions.

[0088] 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. It should also be understood that the features of the various embodiments may be combined or omitted without conflicting technical solutions.

Claims

1. A scroll compressor comprising: A movable scroll (110, 210, 310), the movable scroll having a first end plate and a first scroll blade formed on the first end plate; A fixed scroll (120, 220, 320) having a second end plate (122, 322) and a second scroll blade (124, 324) formed on a first side of the second end plate, the first scroll blade and the second scroll blade being engaged with each other to form a central compression chamber and a plurality of intermediate compression chambers between the movable scroll and the fixed scroll, The second end plate is formed with a first recess (126, 226, 327) configured as a sealed cavity (C1) on a second side opposite to the first side, and a first channel (121, 221, 321) and a second channel (123, 323) are further formed in the second end plate, wherein the first channel is configured to selectively provide fluid communication between at least one first intermediate compression cavity among the plurality of intermediate compression cavities and the sealed cavity, and the second channel is configured to selectively provide fluid communication between the sealed cavity and a suction pressure area of ​​the scroll compressor. The first channel includes a first opening (1211, 3211) located in the sealed cavity, the second channel includes a second opening (1231, 3231) located in the sealed cavity, a check valve (150, 250, 350) is provided in the sealed cavity, and the valve plate (151, 351, 451, 551) of the check valve can simultaneously cover the first opening (1211, 3211) and the second opening (1231, 3231) to synchronously open or close the first channel and the second channel.

2. The scroll compressor according to claim 1, wherein: A third channel (125, 2251, 3251) is provided in the second end plate, the third channel is connected to the sealing chamber fluid and the third channel is connected to a solenoid valve (170, 270, 370) that can switch between a first state and a second state. In the first state, the third channel connects the sealing chamber with the suction pressure zone fluid of the scroll compressor through the solenoid valve so that the valve plate of the check valve is opened. In the second state, the third channel is closed by the solenoid valve or the third channel connects the sealing chamber with the high-pressure or medium-pressure zone fluid of the scroll compressor through the solenoid valve so that the valve plate of the check valve is closed.

3. The scroll compressor according to claim 2, wherein: A hub portion (128, 228, 328) is formed in the center of the second side of the second end plate, and a fixed vortex central exhaust channel (C0) is formed in the hub portion and is fluidically connected to the exhaust port (129, 229, 329) of the fixed vortex. A hole (127) is also formed in the hub portion, and the hole connects the sealing cavity with the fixed vortex central exhaust channel fluid. The cross-sectional area of ​​the hole is smaller than the cross-sectional area of ​​the third channel.

4. The scroll compressor according to claim 2, wherein: A fourth channel (2252, 3252) is provided in the second end plate, and the fourth channel is fluidically connected to the central compression chamber or the fourth channel is fluidically connected to a second intermediate compression chamber among the plurality of intermediate compression chambers, wherein the pressure of the second intermediate compression chamber is higher than the pressure of the first intermediate compression chamber, and the fourth channel is connected to the solenoid valve, in the first state, the fourth channel is closed by the solenoid valve, and in the second state, the fourth channel is fluidically connected to the third channel through the solenoid valve.

5. The scroll compressor according to claim 1, wherein: The scroll compressor includes a cover plate (130, 230) arranged on the second side of the second end plate, the cover plate covering the first recess (126, 226) to form the sealed cavity. The scroll compressor according to claim 1 , wherein: A second recess (326) is formed on the second side of the second end plate, and the second recess is configured as a back pressure chamber (C2) of the fixed scroll. The first recess (327) is formed below the second recess (326) in the axial direction, and the scroll compressor includes a sealing spacer (330) that covers the first recess to form the sealing chamber.

7. The scroll compressor according to claim 6, wherein: The sealed chamber is constructed as a first chamber and a second chamber that are spaced apart from each other and are arranged on both sides of the axis of the fixed scroll, and the first chamber and the second chamber are fluidically connected through a groove (3226) formed on the second end plate.

8. The scroll compressor according to any one of claims 1 to 7, wherein: The valve plate of the check valve includes a first end and a second end, the first end and the second end are connected by a connecting portion, the first end is fixed to the second end plate, and the second end selectively opens or closes the first opening and the second opening.

9. The scroll compressor according to any one of claims 1 to 7, wherein: The check valve comprises a baffle (352) located above the valve plate, and a through hole (3521) is provided at a position of the baffle corresponding to the first opening and the second opening below the valve plate.

10. The scroll compressor according to any one of claims 1 to 7, wherein: In the sealing cavity, the second end plate is formed with a boss portion (1211) surrounding the first opening and the second opening, and the valve plate can contact the boss portion to seal the first opening and the second opening.

11. The scroll compressor according to any one of claims 1 to 7, wherein: In the sealed cavity, the second end plate is formed with a sink (3212) surrounding the first opening and spaced apart from the first opening, the sink being in fluid communication with the second opening and not in fluid communication with the first opening.

12. The scroll compressor according to any one of claims 1 to 7, wherein: The first channel includes an eccentrically arranged first channel section (3213) and a second channel section (3215), wherein the first channel section is connected to the sealing chamber, the second channel section is connected to the at least one first intermediate compression chamber, and the second channel section is constructed as a plurality of channels distributed roughly along the vortex line.

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