Orbiting scroll, back pressure structure and carbon dioxide compressor

Abstract

The present invention relates to the field of compressor technology, and more specifically, to an orbiting scroll, a back-pressure structure, and a carbon dioxide compressor. The orbiting scroll comprises a orbiting scroll body, an orbiting volute, a pressure-introduction hole, and a return-pressure hole. The orbiting scroll is disposed on the orbiting scroll body. The pressure-introduction hole penetrates both the orbiting scroll body and the orbiting scroll body, and is located near the exhaust hole of the stationary scroll to direct high-pressure fluid near the exhaust hole to a back-pressure chamber. The return-pressure hole is disposed through the orbiting scroll body to reduce the pressure in the back-pressure chamber. This can balance the pressure between the back-pressure chamber and the compression chamber, thereby ensuring efficient and stable operation of the orbiting and stationary scrolls.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a movable scroll, a back pressure structure and a carbon dioxide compressor. Background Art

[0002] The back pressure structure is a key component of a CO2 compressor and is crucial to its operation. However, the existing back pressure structure often has an irrational back pressure chamber configuration, which often results in an imbalance in the back pressure received by the orbiting scroll, causing the orbiting scroll to overturn. Summary of the Invention

[0003] The objects of the present invention include, for example, providing a movable scroll, a back pressure structure and a carbon dioxide compressor, which can balance the pressure between the back pressure chamber and the compression chamber, thereby ensuring efficient and stable operation of the movable and stationary scrolls.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] In a first aspect, the present invention provides an orbiting scroll for forming a compression chamber with a stationary scroll and a back pressure chamber with a front cover assembly, comprising:

[0006] A movable disc body, a movable scroll, a pressure inlet hole and a return pressure hole; the movable scroll is arranged on the movable disc body;

[0007] The pressure-introducing hole penetrates the movable scroll and the movable plate body at the same time, and the pressure-introducing hole is close to the exhaust hole of the fixed scroll to guide the high-pressure fluid near the exhaust hole to the back-pressure chamber;

[0008] The back pressure hole is provided through the movable plate body to reduce the pressure of the back pressure chamber.

[0009] One end of the pressure-introducing hole of the movable scroll of this solution is connected to the compression chamber, and the other end of the pressure-introducing hole is connected to the back-pressure chamber. When the movable scroll starts to rotate, it moves relative to the static scroll and changes the volume of the compression chamber, thereby achieving the purpose of compressing the gas. As the movable scroll continues to operate, the pressure of the exhaust hole rises and forms a high-pressure airflow here. At this time, the high-pressure gas at the exhaust hole will enter the back-pressure chamber through the pressure-introducing hole on the movable scroll; the high-pressure gas coming from the pressure-introducing hole causes the pressure in the back-pressure chamber to rise, thus generating back pressure that causes the movable scroll to gradually stick to the static scroll. When the back pressure rises to the preset pressure, the pressure-introducing hole is closed. At this time, the pressure in the back-pressure chamber is just in a critical equilibrium state, that is, the pressure on both sides of the axis of the movable scroll is balanced, thereby ensuring the smooth operation of the movable scroll.

[0010] Furthermore, as the orbiting scroll continues to rotate, the pressure in the back-pressure chamber will continue to rise. At this time, the high-pressure airflow in the back-pressure chamber will enter the side of the static scroll through the back-pressure hole to gradually leak the pressure in the back-pressure chamber. In this way, the end face of the orbiting scroll and the end face of the static scroll will fall off. At this time, the high-pressure gas at the exhaust port of the pressure-introduction hole will be opened to re-enter the back-pressure chamber, so that it reaches a new balance.

[0011] Such a movable scroll can make the scroll compressor always in a dynamic balance process in the entire back pressure chamber when the compressor is working, and the back pressure of the movable scroll assembly also changes with the change of the compressor exhaust pressure, so that the end face of the movable scroll is close to the static scroll, and the gas leakage of the end face of the scroll profile is reduced, the volumetric efficiency of the scroll is improved, and the refrigeration performance of the product is improved.

[0012] In an optional embodiment, the pressure-introducing hole extends along the axis of the orbiting scroll. This arrangement allows the high-pressure airflow from the exhaust hole to be promptly and efficiently delivered to the back-pressure chamber, thereby improving the flow diversion efficiency of the pressure-introducing hole and ensuring that the orbiting scroll balances the pressure in the back-pressure chamber.

[0013] In an optional embodiment, the diameter of the pressure-introducing hole is larger than that of the back-pressure hole. The back-pressure hole is only used to slightly and slowly release the pressure in the back-pressure chamber to prevent the pressure in the back-pressure chamber from being too high. Therefore, the diameter of the back-pressure hole is smaller than the pressure of the pressure-introducing hole, which can ensure the diversion effect of the pressure-introducing hole while meeting the back-pressure function.

[0014] In an alternative embodiment, the back-pressure hole is located radially away from the pressure-introducing hole of the orbiting scroll. The back-pressure hole serves only to release pressure from the back-pressure hole and does not convey airflow from the back-pressure chamber to the compression chamber, thereby ensuring that the orbiting scroll can compress gas in the desired manner. Placing the back-pressure hole away from the pressure-introducing hole ensures back pressure while avoiding any impact on the compression effect of the compression chamber.

[0015] In an optional embodiment, along the radial direction of the movable scroll, the end of the pressure-introducing hole is located at a starting end position of the movable scroll close to the center.

[0016] In this way, the pressure-introducing hole can timely and efficiently guide the high pressure at the exhaust hole to the back pressure chamber as quickly as possible, and this arrangement is convenient to process and has significant effects.

[0017] In an optional embodiment, the diameter of the pressure-inducing hole is smaller than the diameter of the exhaust hole.

[0018] This arrangement can prevent the pressure-inducing hole from directing excessive airflow to the back-pressure chamber, thereby preventing the problem of insufficient exhaust pressure.

[0019] In an optional embodiment, an oil groove is further provided on the end surface of the movable scroll away from the fixed scroll, and the pressure-inducing hole passes through the oil groove.

[0020] The oil groove is used to contain lubricant so that the linear end surfaces of the orbiting scroll and the fixed scroll can be fully lubricated, thereby reducing the friction resistance of the orbiting scroll movement, thus making the orbiting scroll run smoother and more efficiently.

[0021] In an optional embodiment, along the circumferential direction of the movable scroll, the oil groove is provided along the extending direction of the movable scroll.

[0022] This arrangement not only conforms to the shape structure and extension direction of the movable scroll, but also enables the lubricant in the oil groove to flow with the circumferential rotation of the movable scroll, thereby ensuring the lubrication effect of the movable scroll.

[0023] In an optional embodiment, the oil groove is a crescent groove.

[0024] In a second aspect, the present invention provides a back pressure structure, comprising:

[0025] A fixed scroll, a front cover assembly, and an orbiting scroll according to any one of the aforementioned embodiments; the orbiting scroll and the fixed scroll enclose a closed compression chamber, and the side of the orbiting scroll away from the fixed scroll and the front cover assembly enclose a closed back pressure chamber;

[0026] The pressure-introducing hole is used to guide the high-pressure fluid near the exhaust hole to the back-pressure chamber;

[0027] The back pressure hole is used to connect the back pressure chamber with the compression chamber to reduce the pressure of the back pressure chamber.

[0028] In an optional embodiment, the back pressure structure includes a sealing assembly;

[0029] The sealing assembly is arranged between the movable scroll and the front cover assembly; the movable scroll is supported on the sealing assembly.

[0030] The sealing assembly here has a certain amount of deformation, which can form a short-term seal. Through the sealing assembly and the sealing ring, a back pressure cavity is formed on the back of the movable scroll.

[0031] In an optional embodiment, the sealing assembly is embedded between the front cover assembly and the end surface of the static scroll.

[0032] In a third aspect, the present invention provides a carbon dioxide compressor, comprising:

[0033] A drive assembly, a rear cover assembly, and a back pressure structure according to any one of the preceding embodiments;

[0034] The rear cover assembly is arranged on a side of the fixed scroll away from the movable scroll; the driving assembly is connected to the movable scroll of the back pressure structure to drive the movable scroll to perform eccentric rotation relative to the fixed scroll.

[0035] The beneficial effects of the embodiments of the present invention include, for example:

[0036] The pressure-introducing hole of the movable scroll of this solution can guide the high-pressure airflow to the back-pressure chamber when the pressure at the exhaust hole increases. The above-mentioned high-pressure gas increases the pressure in the back-pressure chamber, thereby gradually making the movable scroll close to the static scroll. When the back pressure rises to the preset pressure, the pressure-introducing hole is closed. At this time, the pressure in the back-pressure chamber is just in a critical equilibrium state, that is, the pressure on both sides of the axis of the movable scroll is balanced, thereby ensuring the smooth operation of the movable scroll. The back-pressure hole can slowly release the high-pressure gas in the back-pressure chamber to the side of the movable scroll close to the static scroll, so that the end face of the movable scroll and the end face of the static scroll fall off. At this time, the pressure-introducing hole exhaust port is opened and the high-pressure gas re-enters the back-pressure chamber, so that it reaches a new equilibrium.

[0037] This type of orbiting scroll ensures that the entire back-pressure chamber of the scroll compressor is in a state of dynamic equilibrium during operation. The back pressure of the orbiting scroll assembly also changes with changes in the compressor's exhaust pressure, allowing the end face of the orbiting scroll to closely contact the stationary scroll. This reduces gas leakage from the scroll profile end face, improves the scroll volumetric efficiency, and thus enhances the product's refrigeration performance. Due to the relatively constant contact between the orbiting and stationary scrolls, the compressor can adapt to a wider range of speeds and operating pressures. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 Schematic diagram of the structure of the movable scroll according to an embodiment of the present invention;

[0040] Figure 2 A schematic structural diagram of a movable scroll from another perspective of an embodiment of the present invention;

[0041] Figure 3 This is a structural diagram of a carbon dioxide compressor according to an embodiment of the present invention;

[0042] Figure 4 This is a structural schematic diagram of a carbon dioxide compressor from another perspective according to an embodiment of the present invention.

[0043] Icons: 100-orbiting scroll; 101-pressure inlet hole; 102-back pressure hole; 103-oil tank; 110-orbiting scroll body; 120-orbiting scroll; 20-back pressure structure; 200-stationary scroll; 201-exhaust hole; 300-front cover assembly; 401-compression chamber; 402-back pressure chamber; 500-sealing assembly; 610-anti-rotation pin; 620-anti-rotation hole; 30-CO2 compressor; 31-drive assembly. DETAILED DESCRIPTION

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0046] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0047] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0048] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0049] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0050] A scroll compressor is a positive displacement compressor whose compression components consist of a moving scroll and a stationary scroll.

[0051] When the rotating scroll component is restricted in rotation by the rotation restricting mechanism and rotates along a circular orbit, the compression chamber changes its volume while moving, performing suction, compression and discharge. The lubricating oil applies a specified back pressure to the outer periphery of the rotating scroll component and the back of the scroll wrap, preventing the rotating scroll component from leaving the fixed scroll component and overturning.

[0052] A CO2 compressor is a compressor used to pressurize and transport CO2 gas. When using CO2 as a refrigerant, the pressure difference between the compressor's discharge and suction pressures is approximately 7-10 times higher than the pressure difference in conventional refrigeration cycles using Freon as a refrigerant.

[0053] However, the back pressure chamber of the existing back pressure structure is not properly arranged, which often causes the back pressure on the movable scroll to be unbalanced and the movable scroll to overturn.

[0054] In order to improve the above technical problems, a movable scroll, a back pressure structure and a carbon dioxide compressor are provided in the following embodiments.

[0055] Please refer to Figure 1 This embodiment provides a movable scroll 100 for forming a compression chamber 401 with the fixed scroll 200 and a back pressure chamber 402 with the front cover assembly 300, including a movable disk body 110, a movable scroll 120, a pressure inlet hole 101 and a back pressure hole 102.

[0056] The movable scroll 120 is disposed on the movable plate body 110;

[0057] The pressure-introducing hole 101 penetrates both the orbiting scroll 120 and the orbiting plate body 110 , and is close to the exhaust hole 201 of the fixed scroll 200 to guide the high-pressure fluid near the exhaust hole 201 to the back-pressure chamber 402 ;

[0058] The back pressure hole 102 is provided through the movable plate body 110 to reduce the pressure of the back pressure chamber 402 .

[0059] One end of the pressure-introducing hole 101 of the orbiting scroll 100 of this embodiment is connected to the compression chamber 401, and the other end is connected to the backpressure chamber 402. When the orbiting scroll 100 begins to rotate, it moves relative to the fixed scroll 200, changing the volume of the compression chamber 401 and thereby compressing the gas. As the orbiting scroll 100 continues to rotate, the pressure in the exhaust hole 201 rises, forming a high-pressure airflow. At this point, the high-pressure gas at the exhaust hole 201 flows into the backpressure chamber 402 through the pressure-introducing hole 101 on the orbiting scroll 100. The high-pressure gas flowing from the pressure-introducing hole 101 increases the pressure in the backpressure chamber 402, generating backpressure that gradually presses the orbiting scroll 100 against the fixed scroll 200. When the backpressure rises to a preset pressure, the pressure-introducing hole 101 is closed. At this point, the pressure in the backpressure chamber 402 is in a critical equilibrium state, meaning that the pressures on both sides of the axial direction of the orbiting scroll 100 are balanced, thus ensuring the smooth operation of the orbiting scroll 100.

[0060] Furthermore, as the movable scroll 100 continues to rotate, the pressure in the back-pressure chamber 402 will continue to rise. At this time, the high-pressure airflow in the back-pressure chamber 402 will enter the side of the static scroll 200 through the back-pressure hole 102 to gradually leak the pressure in the back-pressure chamber 402. In this way, the end face of the movable scroll 100 and the end face of the static scroll 200 will fall off. At this time, the high-pressure gas at the exhaust port of the pressure-introducing hole 101 will be opened to re-enter the back-pressure chamber 402, so that it reaches a new balance.

[0061] Such a movable scroll 100 can ensure that the scroll compressor is always in a dynamic balance process in the entire back pressure chamber 402 when the compressor is working, and the back pressure of the movable scroll 100 component also changes with the change of the compressor exhaust pressure, so that the end face of the movable scroll 100 is close to the fixed scroll 200, and the gas leakage at the end face of the scroll profile is reduced, the volumetric efficiency of the scroll is improved, and the refrigeration performance of the product is improved.

[0062] Please continue to refer to Figures 1 to 4 , to understand more structural details of the movable scroll 100.

[0063] As can be seen from the figure, in this embodiment, the pressure-introducing hole 101 extends along the axis of the orbiting scroll 100. This arrangement enables the high-pressure airflow from the exhaust hole 201 to be promptly and efficiently delivered to the back-pressure chamber 402, thereby improving the flow diversion efficiency of the pressure-introducing hole 101 and ensuring that the orbiting scroll 100 can balance the pressure in the back-pressure chamber 402.

[0064] Optionally, in this embodiment, the diameter of the pressure-inducing hole 101 is larger than the diameter of the back-pressure hole 102 .

[0065] The back pressure hole 102 is only used to release the pressure of the back pressure chamber 402 slightly and slowly to avoid excessive pressure in the back pressure chamber 402. Therefore, the aperture of the back pressure hole 102 is smaller than the pressure of the pressure inlet hole 101, which can meet the back pressure effect while ensuring the diversion effect of the pressure inlet hole 101.

[0066] Furthermore, in this embodiment of the present invention, the back-pressure hole 102 is located radially away from the pressure-introducing hole 101 of the orbiting scroll 100. The back-pressure hole 102 serves only to release pressure from the back-pressure hole and does not convey airflow from the back-pressure chamber 402 to the compression chamber 401. This ensures that the orbiting scroll 100 can compress gas in the desired manner. Positioning the back-pressure hole 102 away from the pressure-introducing hole 101 ensures back pressure while avoiding any impact on the compression effect of the compression chamber 401.

[0067] It is not difficult to find that in this embodiment of the present invention, along the radial direction of the movable scroll 100 , the end of the pressure-introducing hole 101 is located at the starting end position of the movable scroll 120 close to the center.

[0068] In this way, the pressure-introducing hole 101 can timely and efficiently guide the high pressure at the exhaust hole 201 to the back-pressure chamber 402 as quickly as possible. In addition, this arrangement is convenient to manufacture and has significant effects.

[0069] In this embodiment, the diameter of the pressure-introducing hole 101 is smaller than the diameter of the exhaust hole 201. This arrangement can prevent the pressure-introducing hole 101 from diverting excessive airflow to the back-pressure chamber 402, thereby preventing the exhaust pressure from being insufficient.

[0070] It can also be seen from the figure that, in the embodiment, an oil groove 103 is further provided on the end surface of the movable scroll 120 away from the fixed scroll 200 , and the pressure-introducing hole 101 penetrates into the oil groove 103 .

[0071] The oil groove 103 is used to contain lubricant so that the linear end surfaces of the orbiting scroll 100 and the fixed scroll 200 can be fully lubricated, thereby reducing the friction resistance of the orbiting scroll 100, so that the orbiting scroll 100 can run more smoothly and efficiently.

[0072] Optionally, the oil groove 103 is arranged along the circumferential direction of the orbiting scroll 120 and the extension direction of the orbiting scroll 120. This arrangement not only conforms to the shape, structure and extension direction of the orbiting scroll 120, but also allows the lubricant in the oil groove 103 to flow as the orbiting scroll 100 rotates circumferentially, thereby ensuring the lubrication effect of the orbiting scroll 100.

[0073] In this embodiment, the oil groove 103 is a crescent groove, that is, the oil groove 103 is a crescent-shaped groove.

[0074] During operation, when the compressor is operating, high-pressure gas at the exhaust port 201 first flows into the back-pressure chamber 402 through the pressure-introducing hole 101 on the rotor plate. As the pressure in the back-pressure chamber 402 increases, the rotor plate gradually presses against the stationary plate. Eventually, when the pressure reaches a certain level, the pressure-introducing hole 101 closes. At this point, the pressure in the back-pressure chamber 402 is at a critical equilibrium state.

[0075] When the pressure in the back pressure chamber 402 gradually leaks through the gaps in the surrounding components and the air return holes, the end faces of the moving plate and the static plate fall off. At this time, the high-pressure gas at the exhaust port re-enters the back pressure chamber 402, causing it to reach a new balance.

[0076] During compressor operation, the entire back-pressure chamber 402 is in a state of constant dynamic equilibrium. The back pressure of the orbiting scroll 100 assembly also fluctuates with changes in the compressor's exhaust pressure, allowing the end face of the orbiting scroll 100 to closely contact the stationary scroll 200. This reduces gas leakage from the scroll profile end face, improves the scroll volumetric efficiency, and thus enhances the product's cooling performance. This relatively constant contact between the orbiting and stationary scrolls 200 allows the compressor to adapt to a wider range of speeds and operating pressures.

[0077] In a second aspect, the present invention provides a back pressure structure 20, comprising:

[0078] The fixed scroll 200, the front cover assembly 300, and the orbiting scroll 100 of any of the aforementioned embodiments; the orbiting scroll 100 and the fixed scroll 200 enclose a sealed compression chamber 401, and the side of the orbiting scroll 100 away from the fixed scroll 200 and the front cover assembly 300 enclose a sealed back pressure chamber 402;

[0079] The pressure-introducing hole 101 is used to guide the high-pressure fluid near the exhaust hole 201 to the back-pressure chamber 402;

[0080] The back pressure hole 102 is used to connect the back pressure chamber 402 with the compression chamber 401 to reduce the pressure in the back pressure chamber 402 .

[0081] It can also be seen from the figure that in this embodiment of the present invention, the back pressure structure 20 includes a sealing assembly 500; the sealing assembly 500 is disposed between the movable scroll 100 and the front cover assembly 300; and the movable scroll 100 is supported on the sealing assembly 500.

[0082] Furthermore, a sealing ring is provided between the front cover assembly 300 and the rotor, and a sealing assembly 500 is provided on the back edge of the orbiting scroll 100. The sealing assembly 500 has a certain amount of deformation, which can form a short-term seal. The sealing assembly 500 and the sealing ring form a back pressure chamber 402 on the back of the orbiting scroll 100.

[0083] Optionally, the sealing assembly 500 is embedded between the front cover assembly 300 and the end surface of the fixed scroll 200. This arrangement can further ensure the sealing effect between the front cover assembly 300, the fixed scroll 200 and the orbiting scroll 100, thereby ensuring the operating efficiency of the scroll compressor.

[0084] Furthermore, the back-pressure chamber of the CO2 compressor in this embodiment requires special sealing. This sealing assembly consists of a sealing structure on the orbiting scroll, an O-ring high-pressure oil seal on the intermediate housing, and a sealing ring. This allows for the enormous airflow pressure in the back-pressure chamber, thereby ensuring stable operation of the CO2 compressor.

[0085] from Figure 3 and Figure 4 As can also be seen in the figure, the end surface of the front cover assembly 300 near the orbiting scroll 100 is provided with a plurality of circumferentially evenly spaced anti-rotation pins 610, and the end surface of the orbiting scroll 100 near the front cover assembly 300 is provided with a plurality of circumferentially evenly spaced anti-rotation holes 620. The anti-rotation pins 610 and the anti-rotation holes 620 correspond one-to-one, thus preventing the orbiting scroll 100 from rotating about its central axis.

[0086] In a third aspect, the present invention provides a carbon dioxide compressor 30, comprising:

[0087] The drive assembly 31, the rear cover assembly and the back pressure structure 20 of any of the above embodiments;

[0088] The rear cover assembly is arranged on the side of the fixed scroll 200 away from the movable scroll 100; the driving assembly 31 is connected to the movable scroll 100 of the back pressure structure 20 to drive the movable scroll 100 to perform eccentric rotation relative to the fixed scroll 200.

[0089] Optionally, the driving assembly 31 here is a rotor. The rotor is connected to the center of the movable scroll 100 through a counterweight and a balancing block, and the rotor drives the movable scroll 100 to perform eccentric rotation.

[0090] Furthermore, a sealing ring is provided between the front cover assembly 300 and the rotor, and a sealing assembly 500 is provided on the back edge of the movable scroll. The sealing assembly 500 has a certain amount of deformation to form a short-term seal. A back pressure chamber 402 is formed on the back of the movable scroll 100 through the sealing assembly 500 and the sealing ring.

[0091] In summary, the embodiments of the present invention provide an orbiting scroll 100, a back pressure structure 20, and a carbon dioxide compressor 30, which have at least the following advantages:

[0092] Through the coordinated cooperation of the pressure-introducing hole 101 and the back-pressure hole, the entire back-pressure chamber 402 is always in a dynamic equilibrium process when the compressor is working, and the back pressure of the movable scroll 100 assembly also changes with the change of the compressor exhaust pressure, so that the end face of the movable scroll 100 is close to the static scroll 200, and the gas leakage at the end face of the scroll profile is reduced, the volumetric efficiency of the scroll is improved, and the refrigeration performance of the product is improved.

[0093] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A movable scroll, used to form a compression chamber with a fixed scroll and a back pressure chamber with a front cover assembly, characterized in that: include: A movable disc body (110), a movable scroll (120), a pressure-inducing hole (101), and a return-pressure hole (102); the movable scroll (120) is arranged on the movable disc body (110); The pressure-inducing hole (101) simultaneously penetrates the movable scroll (120) and the movable disk body (110), and the pressure-inducing hole (101) is close to the exhaust hole (201) of the fixed scroll (200) to guide the high-pressure fluid near the exhaust hole (201) to the back-pressure chamber (402); The back pressure hole (102) is provided through the movable disc body (110) to reduce the pressure of the back pressure cavity (402); The aperture of the pressure-inducing hole (101) is larger than the aperture of the back-pressure hole (102); the back-pressure hole (102) is only used to slightly and slowly release the pressure of the back-pressure chamber (402) to avoid excessive pressure in the back-pressure chamber (402); therefore, the aperture of the back-pressure hole (102) is smaller than the pressure of the pressure-inducing hole (101), which can ensure the diversion effect of the pressure-inducing hole (101) while satisfying the back-pressure effect; Along the radial direction of the movable scroll, the back-pressure hole (102) is located on a side away from the pressure-inducing hole (101); the back-pressure hole (102) is only used to release the pressure of the back-pressure hole, and does not convey the airflow of the back-pressure chamber (402) to the compression chamber (401), thereby ensuring that the movable scroll (100) can be installed to compress gas in a preset manner; arranging the back-pressure hole (102) away from the pressure-inducing hole (101) can ensure back pressure while avoiding affecting the compression effect of the compression chamber (401); One end of the pressure-introducing hole of the movable scroll is connected to the compression chamber, and the other end of the pressure-introducing hole is connected to the back-pressure chamber; when the movable scroll starts to rotate, the movable scroll moves relative to the fixed scroll and changes the volume of the compression chamber, thereby achieving the purpose of compressing the gas; as the movable scroll continues to rotate, the pressure in the exhaust hole rises and forms a high-pressure airflow here. At this time, the high-pressure gas at the exhaust hole will enter the back-pressure chamber through the pressure-introducing hole on the movable scroll; the high-pressure gas coming from the pressure-introducing hole causes the pressure in the back-pressure chamber to increase, and the back pressure generated in this way causes the movable scroll to gradually stick to the fixed scroll; when the back pressure rises to the preset pressure, the pressure-introducing hole is closed. At this time, the pressure in the back-pressure chamber is just in a critical equilibrium state, that is, the pressure on both sides of the axis of the movable scroll is balanced, thereby ensuring the smooth operation of the movable scroll; Furthermore, as the orbiting scroll continues to rotate, the pressure in the back-pressure chamber will continue to rise. At this time, the high-pressure airflow in the back-pressure chamber will enter the side of the static scroll through the back-pressure hole, gradually leaking the pressure in the back-pressure chamber. In this way, the end faces of the orbiting scroll and the static scroll fall off. At this time, the high-pressure gas from the pressure-introduction hole and the exhaust port are opened to re-enter the back-pressure chamber, so that it reaches a new balance. Such a movable scroll can make the scroll compressor always in a dynamic balance process in the entire back pressure chamber when the compressor is working, and the back pressure of the movable scroll assembly also changes with the change of the compressor exhaust pressure, so that the end face of the movable scroll is close to the static scroll, and the gas leakage of the end face of the scroll profile is reduced, the volumetric efficiency of the scroll is improved, and the refrigeration performance of the product is improved.

2. The movable scroll according to claim 1, wherein: The pressure-inducing hole (101) extends along the axis of the movable scroll.

3. The movable scroll according to claim 1, wherein: Along the radial direction of the movable scroll, the end of the pressure-inducing hole (101) is located at a starting position close to the center of the movable scroll (120).

4. The movable scroll according to claim 1, wherein: The diameter of the pressure-inducing hole (101) is smaller than the diameter of the exhaust hole (201).

5. A back pressure structure, characterized in that: include: A fixed scroll (200), a front cover assembly (300), and a movable scroll according to any one of claims 1 to 4; the movable scroll and the fixed scroll (200) enclose a closed compression chamber (401), and a side of the movable scroll away from the fixed scroll (200) and the front cover assembly (300) enclose a closed back pressure chamber (402); The pressure-inducing hole (101) is used to guide the high-pressure fluid near the exhaust hole (201) to the back-pressure chamber (402); The back pressure hole (102) is used to connect the back pressure chamber (402) with the compression chamber (401) to reduce the pressure of the back pressure chamber (402).

6. The back pressure structure according to claim 5, characterized in that: The back pressure structure includes a sealing assembly (500); The sealing assembly (500) is arranged between the movable scroll and the front cover assembly (300); the movable scroll is supported on the sealing assembly (500).

7. The back pressure structure according to claim 6, characterized in that: The sealing assembly (500) is embedded between the front cover assembly (300) and the end surface of the static scroll (200).

8. A carbon dioxide compressor, characterized in that: include: A drive assembly (31), a rear cover assembly, and a back pressure structure according to any one of claims 5 to 7; The rear cover assembly is arranged on a side of the static scroll (200) away from the movable scroll; the driving assembly (31) is connected to the movable scroll of the back pressure structure to drive the movable scroll to perform eccentric rotational motion relative to the static scroll (200).

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