Back pressure adjusting structure and compressor

Abstract

The application provides a back pressure adjusting structure and a compressor. The back pressure adjusting structure comprises a support, a moving scroll and a fixed scroll. The support is provided with a sealing groove extending to the bottom of the moving scroll, and a sealing element is arranged in the sealing groove. The sealing element divides the bottom of the moving scroll into an exhaust cavity and an intermediate cavity. The fixed scroll is provided with an adjusting assembly. The application controls the up-and-down floating of the sealing element through the adjusting assembly, so as to adapt to the different requirements of heavy load working conditions and light load working conditions on the exhaust area of the moving scroll. In the heavy load working condition, the sealing element blocks the exhaust cavity and the intermediate cavity, so that the exhaust area of the back of the moving scroll is the area of the exhaust cavity, which can ensure high exhaust while reducing the contact force of the pump body and further reducing the risk of engagement wear. In the light load working condition, the sealing element connects the exhaust cavity and the intermediate cavity, which increases the exhaust area of the back of the moving scroll and effectively avoids the overturning of the moving scroll, thereby improving the sealing performance of the pump body.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and more particularly to a back pressure regulating structure and a compressor. Background Art

[0002] Scroll compressors are widely used in air conditioning systems due to their high efficiency, compact size, and smooth operation. Scroll compressors are divided into two structures: a high-pressure chamber and a low-pressure chamber, depending on the pressure difference within the casing. The high-pressure chamber houses the exhaust pressure, while the low-pressure chamber houses the suction pressure. In the high-pressure chamber structure, a floating orbiting scroll is a common pump seal, offering axial flexibility and enhancing the compressor's ability to adapt to abnormal operation.

[0003] However, when the high-pressure oil pool area on the back of the orbiting scroll, that is, the side away from the fixed scroll, is too large, especially under high-pressure differential conditions, the pressing force between the end faces of the orbiting and fixed scrolls will be significantly increased. This will not only increase the frictional power consumption of the compressor, but also increase the risk of engagement and wear of the pump body, thereby posing a threat to the reliability of the compressor. Therefore, the design usually avoids excessively large exhaust areas on the back. However, this design also has a drawback: under light-load conditions, insufficient sealing force may occur, causing the orbiting scroll to easily overturn, thereby increasing the leakage of the pump body and affecting the overall performance of the compressor. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a back pressure regulating structure and a compressor to solve the technical problems that the movable scroll is easy to wear under heavy load conditions and easy to overturn under light load conditions.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a back pressure regulating structure, which includes a support, an orbiting scroll placed on the support, and a fixed scroll engaged with the orbiting scroll; wherein,

[0007] The support is provided with a sealing groove extending to the bottom of the orbiting scroll, and a sealing member is provided in the sealing groove; the sealing member divides the bottom of the orbiting scroll into an exhaust chamber and an intermediate chamber, and the exhaust chamber and the intermediate chamber are respectively arranged close to and away from the center of the orbiting scroll;

[0008] The fixed scroll is provided with an adjusting assembly, which is used to control the seal to float up and down in the sealing groove according to the pressure difference between the exhaust pressure and the suction pressure between the fixed scroll and the movable scroll, so as to block or connect the exhaust chamber and the intermediate chamber, and reduce or increase the exhaust area at the bottom of the movable scroll.

[0009] The static scroll is provided with a medium-pressure introduction channel, which communicates with a compression cavity formed between the static scroll and the dynamic scroll; the static scroll is provided with an exhaust transmission channel outside, which is used for transmitting high-pressure gas; the adjusting assembly is used for driving the medium-pressure introduction channel or the exhaust transmission channel to communicate with the sealing groove.

[0010] The static scroll is provided with a first channel and a second channel, which are connected with the sealing groove and the intermediate cavity respectively; the adjusting assembly is used for controlling the opening and closing of the first channel and the second channel, so that the medium-pressure introduction channel and the exhaust transmission channel communicate with the first channel or the second channel.

[0011] The static scroll is provided with a first channel and a second channel, which are connected with the sealing groove and the intermediate cavity respectively; the adjusting assembly is used for controlling the opening and closing of the first channel and the second channel, so that the medium-pressure introduction channel and the exhaust transmission channel communicate with the first channel or the second channel.

[0012] The adjusting assembly comprises an elastic member and an adjusting valve; the adjusting valve is movably connected with the adjusting groove, and the elastic member is arranged between the adjusting valve and the suction port; the elastic member drives the adjusting valve to move along the adjusting groove according to the pressure difference of the suction cavity; the exhaust transmission channel, the first channel and the second channel are connected with the adjusting groove respectively.

[0013] The adjusting valve is provided with a first annular groove and a second annular groove; the first annular groove is arranged at one end of the adjusting valve close to the air inlet, and the second annular groove is arranged in the middle of the adjusting valve and has a spacing with the first annular groove; when the first annular groove moves to the first channel and the second annular groove moves above the second channel, the exhaust transmission channel and the medium-pressure introduction channel communicate with the first channel and the second channel respectively; when the second annular groove moves above the first channel, the medium-pressure introduction channel communicates with the first channel.

[0014] The air inlet is provided with a plug column, and the plug column is provided with a flow-through hole, which communicates the adjusting groove and the exhaust transmission channel.

[0015] The support top is provided with a placing portion and a limiting portion, the limiting portion is arranged at the outer periphery of the placing portion and extends from the placing portion to the direction of the static scroll plate, the dynamic scroll plate is arranged between the placing portion and the limiting portion, the placing portion and the limiting portion abut against the bottom of the dynamic scroll plate and the bottom of the static scroll plate respectively, and the sealing groove extends from the limiting portion to the placing portion.

[0016] The placing portion is provided with a containing groove arranged between the sealing member and the limiting portion, and the gap between the placing portion and the dynamic scroll plate and the containing groove form an intermediate cavity.

[0017] In the second aspect, the application provides a compressor comprising the back pressure adjusting structure.

[0018] Compared with the prior art, the application has the following beneficial effects: the sealing member is controlled to float up and down by the adjusting assembly to block or communicate the exhaust cavity and the intermediate cavity, so that different requirements of the dynamic scroll plate exhaust area under heavy load working conditions and light load working conditions can be met, under the heavy load working conditions, the sealing member blocks the exhaust cavity and the intermediate cavity, so that the exhaust area of the back of the dynamic scroll plate is the area of the exhaust cavity, the high exhaust can be ensured, the contact force of the pump body is reduced, and the risk of engagement wear is reduced, under the light load working conditions, the sealing member communicates the exhaust cavity and the intermediate cavity, the exhaust area of the back of the dynamic scroll plate is increased, the overturning of the dynamic scroll plate is effectively avoided, and the sealing performance of the pump body is improved.

[0019] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, the application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following preferred embodiments are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A structural schematic diagram of a compressor provided by the application is shown in the figure.

[0021] Figure 2 A structural schematic diagram of a back pressure adjusting structure under light load working conditions provided by the application is shown in the figure.

[0022] Figure 3 A structural schematic diagram of a back pressure adjusting structure under heavy load working conditions provided by the application is shown in the figure. Figure 2 A partial A enlarged structural schematic diagram is shown in the figure.

[0023] Figure 4 A partial B enlarged structural schematic diagram is shown in the figure.

[0024] Figure 5 A structural schematic diagram of a back pressure adjusting structure under light load working conditions provided by the application is shown in the figure. Figure 4 A partial B enlarged structural schematic diagram is shown in the figure.

[0025] Figure 6 Fig. 1 is a schematic view of a back pressure regulating structure according to the present application;

[0026] Figure 7 Fig. 2 is a schematic view of a regulating valve of the back pressure regulating structure according to the present application.

[0027] Reference signs:

[0028] 1, support; 11, sealing groove; 111, first groove segment; 112, second groove segment; 113, third groove segment; 114, limiting groove segment; 12, sealing member; 13, placement portion; 131, accommodating recess; 14, limiting portion;

[0029] 2, orbiting scroll; 21, compression chamber; 22, exhaust chamber; 23, intermediate chamber;

[0030] 3, fixed scroll; 31, medium pressure introduction passage; 32, exhaust transmission passage; 33, first passage; 34, second passage; 35, intake port; 36, suction port; 37, regulating groove; 38, plug column; 39, suction chamber;

[0031] 4, regulating assembly; 41, elastic member; 42, regulating valve; 421, first annular groove; 422, second annular groove; 423, connecting portion;

[0032] 5a, suction pipe; 5b, exhaust pipe; 6a, upper cover; 6b, lower cover; 6c, casing; 7a, upper bearing; 7b, upper thrust plate; 7c, main balance weight; 7d, stator; 7e, rotor; 7f, crankshaft; 7g, bracket; 7h, lower bearing; 7i, auxiliary balance weight; 8, oil return pipe; 9, oil pump. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application in combination with the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0034] It should be understood that, when used in the present specification and the appended claims, the terms "comprise" and "include" indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0035] It should also be understood that the terms used herein are for the purpose of describing particular embodiments and are not intended to limit the application. As used in this specification and the appended claims, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0036] It should further be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items, and that the term "at least one of' denotes one, or a combination of two or more items.

[0037] Embodiment One

[0038] Referring to Figures 1-7 The embodiment shown discloses a back pressure regulating structure. Wherein, Figure 1 The application scenario diagram of the back pressure regulating structure of the embodiment, the back pressure regulating structure of the embodiment is applied to a compressor, and further, the compressor is a scroll compressor. The back pressure regulating structure of the embodiment comprises a support 1, a moving scroll 2 placed on the support 1, and a stationary scroll 3 engaged with the moving scroll 2, which is used to adjust the exhaust area of the back of the moving scroll 2, i.e. the side away from the stationary scroll 3.

[0039] Specifically, the support 1 is provided with a sealing groove 11 extending to the bottom of the moving scroll 2, and a sealing element 12 is arranged in the sealing groove 11; the sealing element 12 divides the bottom of the moving scroll 2 into an exhaust cavity 22 and an intermediate cavity 23, and the exhaust cavity 22 and the intermediate cavity 23 are arranged close to and away from the center of the moving scroll 2 respectively; the stationary scroll 3 is provided with an adjusting assembly 4, which is used to control the up-and-down floating of the sealing element 12 in the sealing groove 11 according to the pressure difference between the exhaust pressure and the suction pressure between the stationary scroll 3 and the moving scroll 2, so as to block or communicate the exhaust cavity 22 and the intermediate cavity 23, thereby reducing or increasing the exhaust area of the bottom of the moving scroll 2.

[0040] It can be understood that during the operation of the compressor, the pressure distribution of the back of the moving scroll 2 is uneven, wherein the central region of the moving scroll 2 is communicated with the oil pool through the crankshaft 7f for receiving the oil pressure from the oil pool at the bottom of the compressor, and thus is usually subjected to a relatively high exhaust pressure, while the outer region is subjected to a relatively low medium pressure or suction pressure, so that the sealing element 12 divides the bottom region of the moving scroll 2 into the exhaust cavity 22 close to or located in the central region, and the intermediate cavity 23 located outside the exhaust cavity 22.

[0041] The back pressure regulating structure of this embodiment controls the up and down floating of the seal 12 by regulating the component 4 to block or connect the exhaust chamber 22 and the intermediate chamber 23, and can adapt to the different requirements of heavy load conditions and light load conditions for the exhaust area of ​​the movable scroll 2. Under heavy load conditions, the seal 12 blocks the exhaust chamber 22 and the intermediate chamber 23, so that the exhaust area on the back of the movable scroll 2 is the area of ​​the exhaust chamber 22, which can ensure high exhaust while reducing the contact force of the pump body, thereby reducing the risk of bite wear. Under light load conditions, the seal 12 connects the exhaust chamber 22 and the intermediate chamber 23, increasing the exhaust area on the back of the movable scroll 2, effectively avoiding the overturning of the movable scroll 2, and thereby improving the sealing of the pump body.

[0042] Specifically, the static vortex disc 3 is provided with a medium-pressure introduction channel 31, which is communicated with the compression cavity 21 formed between the static vortex disc 3 and the dynamic vortex disc 2; the static vortex disc 3 is provided with an exhaust transmission channel 32 on the outside, which is used for transmitting high-pressure gas; the adjusting assembly 4 is used for driving the medium-pressure introduction channel 31 or the exhaust transmission channel 32 to be communicated with the sealing groove 11. The vortex teeth on the static vortex disc 3 and the vortex teeth of the dynamic vortex disc 2 are engaged with each other to form the compression cavity 21, and the low-pressure gas enters the compression cavity 21 from the static vortex disc 3, is compressed by the eccentric rotation of the dynamic vortex disc 2 to form medium-pressure gas, part of the medium-pressure gas enters the medium-pressure introduction channel 31, and part of the medium-pressure gas continues to be compressed along the compression cavity 21 to form high-pressure gas which is discharged from the exhaust cavity 22 of the compressor. The exhaust transmission channel 32 is used for transmitting high-pressure gas, and in actual application, the exhaust transmission channel 32 is located in the casing 6c of the compressor, and there is high-pressure gas which needs to be discharged after compression in the casing 6c. The high-pressure gas located on one side of the static vortex disc 3 is used for controlling the sealing element 12, which helps to save energy and realize green environmental protection. Therefore, in the light load working condition, the top of the sealing element 12 is close to the dynamic vortex disc 2 and is subjected to the joint action of the medium-pressure and exhaust pressures, when the medium-pressure introduction channel 31 is communicated with the sealing element 12, the medium-pressure gas provides a thrust for the bottom of the sealing element 12, and the medium-pressure gas and the medium-pressure pressure are close to each other and are relatively low pressure, so the stress on the top of the sealing element 12 is greater than that on the bottom, which causes the sealing element 12 to move downward, so that the exhaust area is distributed on the back of the dynamic vortex disc 2, and then the pressure on the back of the dynamic vortex disc 2 is increased to increase the sealing coefficient of the pump body, reduce the leakage, improve the sealing performance of the compressor, and also help to improve the compression ratio and efficiency of the compressor, so that the compressor can compress the low-pressure gas into high-pressure gas with higher efficiency. In the heavy load working condition, the top of the sealing element 12 is close to the dynamic vortex disc 2 and is subjected to the joint action of the medium-pressure and exhaust pressures, so that the pressure on the top of the sealing element 12 is approximately equal to the average of the medium-pressure and exhaust pressures, i.e. less than the exhaust pressure, when the exhaust transmission channel 32 is communicated with the sealing element 12, the high-pressure gas provides a thrust for the bottom of the sealing element 12, and the pressure of the high-pressure gas is equivalent to the exhaust pressure in the heavy load, and is relatively high pressure relative to the medium-pressure pressure, so the stress on the top of the sealing element 12 is less than that on the bottom, which causes the sealing element 12 to move upward to tightly adhere to the dynamic vortex disc 2, so that the exhaust area is limited to the exhaust cavity 22, and then the pressure on the back of the dynamic vortex disc 2 is reduced, avoiding the excessive pressure on the back of the dynamic vortex disc 2 which causes the contact force of the pump body to be large and causes the engagement wear, and ensuring the reliability of the compressor.

[0043] It will be appreciated that exhaust gas transfer passage 32 can be formed by the gap between the outer wall of the fixed scroll 3 and the compressor casing 6c, or it can be implemented through an external pipe. In this embodiment, exhaust gas transfer passage 32 is the outer area of ​​the fixed scroll 3. In actual use, high-pressure gas to be discharged flows within the casing 6c and is transferred to exhaust gas transfer passage 32, thereby entering the sealing groove 11 and adjusting the position of the seal 12.

[0044] Specifically, the fixed scroll 3 is provided with a first channel 33 and a second channel 34, which are connected to the sealing groove 11 and the intermediate cavity 23, respectively. The regulating assembly 4 is used to control the opening and closing of the first channel 33 and the second channel 34, so that the intermediate pressure introduction channel 31 and the exhaust gas transmission channel 32 are connected to the first channel 33 or the second channel 34. The first channel 33 is used to transmit gas to the sealing groove 11, thereby adjusting the position of the seal 12. The second channel 34 is used to balance the orbiting scroll 2, preventing the seal 12 from closing the intermediate cavity 23 under heavy load conditions, causing the orbiting scroll 2 to be only affected by the exhaust gas pressure and easily causing excessive contact force between the orbiting scroll 2 and the fixed scroll 3. The second channel 34 is connected to the intermediate pressure introduction channel 31, which can pass intermediate pressure gas into the intermediate cavity 23, so that the orbiting scroll 2 remains balanced, thereby reducing the risk of pump body wear and ensuring the operational stability and reliability of the compressor.

[0045] Specifically, an air inlet 35 and an air suction port 36 are respectively provided on the outer and inner sidewalls of the fixed scroll 3. An adjustment groove 37 is provided between the air inlet 35 and the air suction port 36. The adjustment groove 37 connects the air inlet 35 and the air suction port 36, and the adjustment assembly 4 is disposed within the adjustment groove 37. The air suction port 36 connects to an air suction chamber 39 formed between the inner sidewall of the fixed scroll 3 and the outer sidewall of the orbiting scroll 2, and the air inlet 35 connects to the exhaust transmission channel 32. The air suction chamber 39 is located outside the compression chamber 21. More specifically, the air suction chamber 39 is an opening gap between the fixed scroll 3 and the orbiting scroll 2, allowing low-pressure gas to enter between the fixed scroll 3 and the orbiting scroll 2 and then enter the compression chamber 21 for compression. The air inlet 35 connects the exhaust transfer channel 32 with the regulating groove 37, which has a compact structure and high space utilization, and helps to improve the control convenience and connection efficiency of the exhaust transfer channel 32 and the first channel 33; the air intake port 36 is used to provide a gas channel for the regulating component 4, so that during the operation of the compressor, the regulating component 4 can sense and respond to the changes in the pressure difference between the exhaust pressure and the suction pressure between the static scroll 3 and the movable scroll 2, and then flexibly control the medium pressure introduction channel 31 or the exhaust transfer channel 32 to be connected with the first channel 33.

[0046] Specifically, the adjusting assembly 4 comprises an elastic member 41 and an adjusting valve 42; the adjusting valve 42 is movably connected to the adjusting groove 37, and the elastic member 41 is arranged between the suction port 36 and the adjusting valve 42; the elastic member 41 drives the adjusting valve 42 to move along the adjusting groove 37 according to the suction and discharge pressure difference of the suction chamber 39; the exhaust transmission channel 32, the first channel 33 and the second channel 34 are respectively connected to the adjusting groove 37. The suction and discharge pressure difference is the pressure difference between the exhaust pressure and the suction pressure; in the scroll compressor, the suction and discharge pressure difference is an important indicator reflecting the working load and internal pressure state of the compressor; when the compressor is in a light load working condition, the suction and discharge pressure difference is relatively small; when the compressor is in a heavy load working condition, the suction and discharge pressure difference is relatively large; thus, the back pressure adjusting structure of the embodiment detects the running state of the compressor through the suction and discharge pressure difference of the suction chamber 39, and adjusts the lifting of the sealing member 12 according to whether the compressor is in a heavy load or light load running state, thereby adjusting the exhaust area at the back of the orbiting scroll 2, so as to ensure stable operation of the compressor.

[0047] Specifically, the adjusting valve 42 is provided with a first annular groove 421 and a second annular groove 422; the first annular groove 421 is arranged at one end of the adjusting valve 42 close to the suction port 35, and the second annular groove 422 is arranged at the middle of the adjusting valve 42 and has a spacing with the first annular groove 421; when the first annular groove 421 moves to the first channel 33 and the second annular groove 422 moves above the second channel 34, the exhaust transmission channel 32 and the medium pressure introduction channel 31 are respectively communicated with the first channel 33 and the second channel 34; when the second annular groove 422 moves above the first channel 33, the medium pressure introduction channel 31 is communicated with the first channel 33. The first annular groove 421 and the second annular groove 422 are recessed from the surface of the adjusting valve 42 to the center, so that a gap is formed between the adjusting groove 37 and the adjusting groove 37 at the first annular groove 421 and the second annular groove 422, facilitating the communication of the first channel 33 and the second channel 34, the exhaust transmission channel 32 and the medium pressure introduction channel 31 with the adjusting groove 37.

[0048] Specifically, the suction port 35 is provided with a plug column 38, and the plug column 38 is provided with a flow-through hole communicating the adjusting groove 37 and the exhaust transmission channel 32. The plug column 38 is used to limit the movement of the adjusting valve 42, so as to avoid the adjusting valve 42 from flying out of the suction port 35 under the elastic action of the elastic member 41, and the plug column 38 ensures the reliability and durability of the adjusting assembly 4; the arrangement of the flow-through hole ensures smooth and controllable gas flow between the exhaust transmission channel 32 and the adjusting groove 37, which is helpful to further adjust the gas flow rate by adjusting the size or number of the flow-through hole, so as to realize fine adjustment of the back pressure of the orbiting scroll 2.

[0049] In specific implementation, when the suction and discharge pressure difference is less than the preset P value, i.e. the compressor is in a light load condition, the suction and discharge pressure difference generated force F1 is less than the elastic force F2 of the elastic member 41, the elastic member 41 is stretched, the adjusting valve 42 moves away from the suction port 36 under the action of the pressure difference and the pushing action of the elastic member 41, until the adjusting valve 42 contacts the plug column 38, at this time, the second annular groove 422 is located above the first channel 33, so that the adjusting groove 37 is connected to the medium pressure introduction channel 31 and the first channel 33, the medium pressure gas in the compression chamber 21 enters the first channel 33 through the medium pressure introduction channel 31, and then enters the sealing groove 11 to contact the bottom of the sealing member 12, and the pressure at the top of the sealing member 12 is the average value of the pressures of the discharge chamber 22 and the intermediate chamber 23, which is greater than the thrust of the medium pressure gas at the bottom of the sealing member 12, so that the sealing member 12 is lowered, and then the gas in the discharge chamber 22 enters the intermediate chamber 23, the discharge area of the back of the orbiting scroll 2 is increased, the pressure of the back of the orbiting scroll 2 is increased, the sealing coefficient of the pump body is increased, and the leakage of the pump body is reduced; when the suction and discharge pressure difference is greater than the preset P value, i.e. the compressor is in a heavy load condition, the suction and discharge pressure difference generated force F1 is greater than the elastic force F2 of the elastic member 41, the elastic member 41 is compressed, the adjusting valve 42 moves towards the suction port 36 under the action of the pressure difference and the pulling force of the elastic member 41, until the adjusting valve 42 abuts against the groove wall of the adjusting groove 37 close to the suction port 36, at this time, the first annular groove 421 is located above the first channel 33, and the second annular groove 422 is located above the second channel 34, so that the discharge transmission channel 32 is connected to the first channel 33, the high pressure gas enters the first channel 33 through the discharge transmission channel 32, and then enters the sealing groove 11 to push the sealing member 12, and the pressure at the top of the sealing member 12 is the average value of the pressures of the discharge chamber 22 and the intermediate chamber 23, which is less than the thrust of the medium pressure gas at the bottom of the sealing member 12, so that the sealing member 12 rises to tightly adhere to the orbiting scroll 2, then the gas in the discharge chamber 22 is prevented from entering the intermediate chamber 23, the discharge area of the back of the orbiting scroll 2 is reduced, the pressure of the back of the orbiting scroll 2 is reduced, and then the compression of the orbiting scroll 2 and the stationary scroll 3 is reduced, the friction loss of the pump body is reduced, the service life of the compressor is prolonged, and the medium pressure gas in the compression chamber 21 enters the second channel 34 through the medium pressure introduction channel 31, and then enters the intermediate chamber 23 to provide the intermediate pressure for the intermediate chamber 23, so that the orbiting scroll 2 maintains dynamic balance, and the compressor runs stably.

[0050] In the embodiment, the adjusting groove 37 is a circular groove, the adjusting valve 42 and the plug column 38 are cylindrical, the outer wall of the adjusting valve 42 and the outer wall of the plug column 38 are in close contact with the adjusting groove 37, and the first annular groove 421 and the second annular groove 422 have gaps with the adjusting groove 37. The adjusting groove 37 and the plug column 38 are adapted to the shape of the adjusting valve 42, so that the outer wall of the adjusting valve 42 can be closely attached to the inner wall of the adjusting groove 37, so as to avoid the mixing of gas to reduce or increase the original pressure value of the gas. The gaps between the first annular groove 421 and the second annular groove 422 and the adjusting groove 37 provide necessary channels for the flow of gas, so as to realize the connection of the medium-pressure introduction channel 31 with the first channel 33 or the second channel 34, or the connection of the exhaust transmission channel 32 with the first channel 33, so that the orbiting scroll 2 can adapt to the pressure requirements of different working conditions.

[0051] It can be understood that in other embodiments, the shape of the adjusting valve 42, the plug column 38 and the adjusting groove 37 can be adjusted to be triangular, pentagonal, hexagonal or other shapes according to actual needs.

[0052] In the embodiment, the elastic member 41 is a spiral spring, the adjusting valve 42 is provided with a connecting portion 423 away from the first annular groove 421, the diameter of the connecting portion 423 is smaller than the maximum diameter of the adjusting valve 42, the spiral spring is sleeved on the connecting portion 423, and the two ends of the spiral spring are connected with the adjusting valve 42 and the groove wall away from the second annular groove 422 of the adjusting groove 37, respectively. The spiral spring is compressed, the adjusting valve 42 is pulled to move towards the suction port 36, so that the first annular groove 421 and the second annular groove 422 are located above the first channel 33 and the second channel 34, respectively; the spiral spring restores its elasticity, the adjusting valve 42 is pushed to move towards the inlet port 35, so that the second annular groove 422 and the second annular groove 422 are located above the first channel 33 and the second channel 34, respectively.

[0053] It can be understood that in other embodiments, a rubber spring, a disc spring, a spring sheet or an elastic member 41 can be used instead of the spiral spring, and the connection mode of the elastic member 41 and the adjusting valve 42 can be adjusted according to actual needs.

[0054] Specifically, the support 1 is provided with a placing portion 13 and a limiting portion 14, the limiting portion 14 is arranged at the outer periphery of the placing portion 13 and extends from the placing portion 13 to the direction of the static scroll 3; the dynamic scroll 2 is arranged between the placing portion 13 and the limiting portion 14, and the placing portion 13 and the limiting portion 14 abut the bottom of the dynamic scroll 2 and the bottom of the static scroll 3 respectively; the sealing groove 11 extends from the limiting portion 14 to the placing portion 13. The placing portion 13 provides support for the dynamic scroll 2, and the limiting portion 14 is used to limit the movement of the dynamic scroll 2, so as to avoid the dynamic scroll 2 from being separated from the placing portion 13 when performing eccentric rotation, and the setting of the limiting portion 14 ensures the stability of the compressor operation, and at the same time provides a basis for adjusting the back pressure of the dynamic scroll 2. The limiting portion 14 is connected with the static scroll 3, which ensures the stability of the connection between the first channel 33 and the second channel 34 and the sealing groove 11 and the intermediate cavity 23, and ensures the continuity and reliability of the back pressure adjustment of the dynamic scroll 2.

[0055] It can be understood that in other embodiments, there is a gap between the limiting portion 14 and the static scroll 3, and the first channel 33 and the second channel 34 are connected with the sealing groove 11 and the intermediate cavity 23 through the external connecting pipe, instead of the limiting portion 14 abutting the bottom of the static scroll 3 in the embodiment.

[0056] Specifically, the placing portion 13 is provided with a containing groove 131, which is arranged between the sealing element 12 and the limiting portion 14, and the gap between the placing portion 13 and the dynamic scroll 2 and the containing groove 131 form the intermediate cavity 23. The existence of the containing groove 131 enables the pressure of the intermediate cavity 23 to be transmitted to the back of the dynamic scroll 2 more smoothly and continuously, avoiding the shaking or overturning of the dynamic scroll 2 caused by sudden pressure changes, which helps to improve the operation stability of the compressor, reduce the wear caused by vibration and impact, and prolong the service life of the compressor. Directly integrating the containing groove 131 on the top of the placing portion 13 not only simplifies the overall design of the back pressure adjustment structure, but also improves the space utilization, making the overall structure compact, which helps to reduce the manufacturing cost and maintenance difficulty of the compressor.

[0057] Specifically, the sealing groove 11 comprises a first groove section 111, a second groove section 112, a third groove section 113 and a limiting groove section 114 connected in sequence. The first groove section 111, the third groove section 113 and the limiting groove section 114 are arranged axially along the support 1, and the second groove section 112 is arranged radially along the support 1; the first groove section 111 is arranged in the limiting portion 14 and communicates with the first channel 33; the first groove section 111 and the third groove section 113 are respectively located on both sides of the accommodating groove 131, and the second groove section 112 communicates the first groove section 111 and the third groove section 113; the limiting groove section 114 is arranged at one end of the third groove section 113 close to the orbiting scroll 2, and an end of the limiting groove section 114 away from the third groove section 113 is arranged in an open manner; the groove width of the third groove section 113 is smaller than the groove width of the limiting groove section 114; the sealing element 12 is movably connected in the limiting groove section 114, and an outer wall of the sealing element 12 is arranged in abutment with an inner wall of the limiting groove section 114. The medium-pressure gas or the high-pressure gas enters the first groove section 111, the second groove section 112, the third groove section 113 and the limiting groove section 114 in sequence, so that the sealing element 12 floats up and down in the limiting groove section 114. The limiting groove section 114 is used for limiting the movement of the sealing element 12, avoiding the sealing element 12 from leaving the sealing groove 11, and shortening the movement distance of the sealing element 12, so that the sealing element 12 can be driven to move by a smaller part of the gas, and the response efficiency of the back pressure adjustment is improved.

[0058] In the embodiment, the sealing element 12 is made of PTFE material. PTFE (full name: Polytetrafluoroethylene, i.e. polytetrafluoroethylene) is a high molecular compound polymerized from tetrafluoroethylene, which has excellent chemical stability, corrosion resistance, sealing property, high lubrication and non-stickiness, electrical insulation and good aging resistance. The use temperature range of PTFE is wide, and it can work for a long time at a temperature of -190-250°C. In addition, it also has very low friction coefficient and surface tension, which can reduce the friction resistance of the sealing element 12 during movement.

[0059] It can be understood that in other embodiments, rubber, silicone, nylon or other high-performance engineering plastics can be used to replace PTFE material according to actual needs or the type of the internal environment of the compressor.

[0060] In the embodiment, the limiting groove section 114 is a circular groove, and the sealing element 12 is a cylindrical element. The shapes of the limiting groove section 114 and the sealing element 12 are adapted to each other, which improves the abutment degree and sealing performance between the two. Moreover, the regularity and roundness of the circular groove and the cylindrical element enable the sealing element 12 to maintain a stable movement track during the up-and-down floating process, reduces the friction and wear, prolongs the service life of the sealing element 12, reduces the maintenance cost, provides a strong guarantee for the long-term and efficient operation of the compressor, and improves the smoothness of the movement of the sealing element 12, further improves the response efficiency and accuracy of the back pressure adjustment of the orbiting scroll 2.

[0061] It is understandable that in other embodiments, the shapes of the limiting groove section 114 and the sealing member 12 can be adjusted according to actual needs.

[0062] Example 2

[0063] See also Figures 1-7 As shown, this embodiment discloses a compressor, which includes the back pressure regulating structure of embodiment one.

[0064] The compressor of this embodiment realizes self-drive of the seal 12 through the back pressure regulating structure, and can adjust the exhaust area on the back of the movable scroll 2 without consuming electricity and energy, thereby optimizing the performance and efficiency of the compressor and helping to improve the market competitiveness of the compressor.

[0065] Specifically, the compressor of this embodiment further includes an intake pipe 5a, an upper cover 6a, an upper bearing 7a, a casing 6c, an upper thrust plate 7b, a primary counterweight 7c, a stator 7d, an oil return pipe 8, a rotor 7e, a crankshaft 7f, a bracket 7g, a lower bearing 7h, an oil pump 9, a lower cover 6b, an auxiliary counterweight 7i, and an exhaust pipe 5b. The intake pipe 5a is disposed on the upper cover 6a and connected to the fixed scroll 3, and is used to introduce low-pressure gas into the compression chamber 21 between the fixed scroll 3 and the orbiting scroll 2 for compression. The upper bearing 7a is disposed on the side of the support 1 away from the orbiting scroll 2 and is sleeved outside the crankshaft 7f. The crankshaft 7f is connected to the orbiting scroll 2 and is used to drive the orbiting scroll 2 to perform eccentric rotation on the support 1, thereby gradually compressing the compression chamber 21, thereby compressing the low-pressure gas into high-pressure gas, and discharging the gas through the exhaust pipe 5b, which is connected to the casing 6c and located on the side of the support 1 away from the orbiting scroll 2. The lower cover 6b is connected to the bottom of the casing 6c and houses the oil sump. An oil channel is axially provided on the crankshaft 7f, connecting to the oil sump. The upper thrust plate 7b is connected to the side of the support 1 away from the orbiting scroll 2 and has a clearance fit with the crankshaft 7f. One end of the oil return pipe 8 is connected to the support 1, and the other end is connected to the oil sump. The primary and secondary balance weights 7c and 7i are symmetrically arranged on the crankshaft 7f, located above and below the stator 7d. The stator 7d is fixed to the casing 6c, and the rotor 7e rotates within the stator 7d and is connected to the crankshaft 7f. The lower end of the crankshaft 7f passes through the lower bearing 7h and the bracket 7g that supports it. The oil pump 9 is connected to the side of the bracket 7g near the lower cover 6b. Each component of the compressor is closely interconnected and works together to achieve gas compression and discharge. By introducing a backpressure adjustment mechanism, the compressor can automatically adjust the exhaust area behind the orbiting scroll 2 according to the workload, thereby optimizing performance and efficiency.

[0066] The application provides a back pressure adjusting structure and a compressor. The sealing piece is controlled to float up and down by the adjusting assembly to block or communicate the exhaust cavity and the intermediate cavity. Different requirements of heavy load working conditions and light load working conditions on the exhaust area of the orbiting scroll are met. In the heavy load working condition, the sealing piece blocks the exhaust cavity and the intermediate cavity, so that the exhaust area of the back of the orbiting scroll is the area of the exhaust cavity. While ensuring high exhaust, the contact force of the pump body is reduced, and the risk of engagement wear is reduced. In the light load working condition, the sealing piece communicates the exhaust cavity and the intermediate cavity, the exhaust area of the back of the orbiting scroll is increased, the overturning of the orbiting scroll is effectively avoided, and the sealing performance of the pump body is improved.

[0067] The above is only used to further illustrate the technical content of the application by examples, so that the reader can more easily understand, but does not represent that the embodiments of the application are limited to this. Any technical extension or re-creation made according to the application is protected by the application. The protection scope of the application is subject to the claims.

Claims

1. A back pressure regulating structure comprising a support, an orbiting scroll disposed on the support, and a fixed scroll engaged with the orbiting scroll, characterized in that: The support is provided with a sealing groove extending to the bottom of the orbiting scroll, and a sealing member is provided in the sealing groove; the sealing member divides the bottom of the orbiting scroll into an exhaust chamber and an intermediate chamber, and the exhaust chamber and the intermediate chamber are respectively arranged close to and away from the center of the orbiting scroll; The fixed scroll is provided with an adjustment assembly, which is used to control the seal to float up and down in the sealing groove according to the pressure difference between the exhaust pressure and the suction pressure between the fixed scroll and the orbiting scroll, so as to block or connect the exhaust chamber and the intermediate chamber, thereby reducing or increasing the exhaust area at the bottom of the orbiting scroll; The fixed scroll is provided with a medium-pressure introduction channel, an exhaust gas transmission channel is provided on the outer side of the fixed scroll, and the regulating assembly is used to drive the medium-pressure introduction channel or the exhaust gas transmission channel to communicate with the sealing groove; an regulating groove is provided on the outer side wall of the fixed scroll, and the regulating assembly is arranged in the regulating groove; a plug is provided at one end of the regulating groove, and the plug is provided with a flow hole, and the flow hole communicates with the regulating groove and the exhaust gas transmission channel; The regulating assembly includes an elastic member and a regulating valve; the regulating valve is movably connected to the regulating groove, the elastic member is provided on a side of the regulating valve away from the plug, and the elastic member drives the regulating valve to move along the regulating groove according to the suction and exhaust pressure difference between the inner side wall of the fixed scroll and the outer side wall of the orbiting scroll; The regulating valve is provided with a first annular groove and a second annular groove, the first annular groove is arranged at one end of the regulating valve close to the plug, and the second annular groove is arranged in the middle of the regulating valve and there is a distance between the first annular groove and the second annular groove; when the first annular groove moves to communicate with the sealing groove and the second annular groove moves to communicate with the intermediate cavity, the exhaust transmission channel and the medium-pressure introduction channel are communicated with the sealing groove and the intermediate cavity respectively, and when the second annular groove moves to communicate with the sealing groove, the medium-pressure introduction channel is communicated with the sealing groove.

2. The back pressure regulating structure according to claim 1, characterized in that: The intermediate pressure introduction channel is connected to the compression chamber formed between the fixed scroll and the orbiting scroll; and the exhaust gas transfer channel is used to transfer high-pressure gas.

3. The back pressure regulating structure according to claim 2, characterized in that: The fixed scroll plate is provided with a first channel and a second channel, and the first channel and the second channel are respectively connected to the sealing groove and the intermediate cavity; the regulating component is used to control the opening and closing of the first channel and the second channel so that the medium-pressure introduction channel and the exhaust transmission channel are connected to the first channel or the second channel.

4. The back pressure regulating structure according to claim 3, characterized in that: The outer side wall and the inner side wall of the fixed scroll are respectively provided with an air inlet and an air suction port, the regulating groove is provided between the air inlet and the air suction port, the regulating groove connects the air inlet and the air suction port; the air suction port connects the air suction cavity formed between the inner side wall of the fixed scroll and the outer side wall of the movable scroll, and the air inlet connects the exhaust transmission channel.

5. The back pressure regulating structure according to claim 4, characterized in that: The elastic member is arranged between the air intake port and the regulating valve, and the elastic member drives the regulating valve to move along the regulating groove according to the intake and exhaust pressure difference of the air intake chamber; the exhaust transmission channel, the first channel and the second channel are respectively connected to the regulating groove.

6. The back pressure regulating structure according to claim 5, characterized in that: The first annular groove is arranged at one end of the regulating valve close to the air inlet; when the first annular groove moves to the first channel and the second annular groove moves above the second channel, the exhaust transmission channel and the medium-pressure introduction channel are connected to the first channel and the second channel respectively, and when the second annular groove moves above the first channel, the medium-pressure introduction channel is connected to the first channel.

7. The back pressure regulating structure according to claim 6, characterized in that: The air inlet is provided with a plug.

8. The back pressure regulating structure according to claim 7, characterized in that: A placement portion and a restriction portion are provided on the top of the support. The restriction portion is provided on the outer periphery of the placement portion and extends from the placement portion toward the fixed scroll. The orbiting scroll is placed between the placement portion and the restriction portion. The placement portion and the restriction portion respectively abut against the bottom of the orbiting scroll and the bottom of the fixed scroll. The sealing groove extends from the restriction portion to the placement portion.

9. The back pressure regulating structure according to claim 8, characterized in that: The placement portion is provided with an accommodating groove, which is provided between the sealing member and the limiting portion. The gap between the placement portion and the movable scroll and the accommodating groove form an intermediate cavity.

10. A compressor, characterized in that: The invention comprises the back pressure regulating structure according to any one of claims 1 to 9.

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