Backpressure adjusting structure and compressor

Abstract

The invention provides a backpressure adjusting structure and a compressor. The backpressure adjusting structure comprises a support, a movable scroll plate and a static scroll plate, the support is provided with a sealing groove extending to the bottom of the movable scroll plate, and a sealing piece is arranged in the sealing groove; the bottom of the movable scroll plate is divided into an exhaust cavity and a middle cavity by the sealing piece; the static scroll plate is provided with an adjusting assembly. The sealing piece is controlled to float up and down through the adjusting assembly, different requirements of heavy-load working conditions and light-load working conditions for the exhaust area of the movable scroll plate are met, under the heavy-load working conditions, the sealing piece blocks the exhaust cavity and the middle cavity, so that the exhaust area of the back of the movable scroll plate is the exhaust cavity area, high exhaust can be ensured, and the exhaust efficiency is improved. Under the working condition of light load, the sealing piece is communicated with the exhaust cavity and the middle cavity, the exhaust area of the back of the movable scroll plate is increased, overturning of the movable scroll plate is effectively avoided, and then the sealing performance of the pump body is improved.

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, small size and smooth operation. According to the difference in pressure inside the casing, scroll compressors are divided into two structures: high-pressure chamber and low-pressure chamber. The high-pressure chamber structure has exhaust pressure inside the casing, and the low-pressure chamber structure has suction pressure inside the casing. In the high-pressure chamber structure, the floating movable scroll is a common pump body sealing form, which has the characteristics of axial flexibility, which is conducive to improving the compressor's ability to adapt to abnormal operation.

[0003] However, when the area of ​​the high-pressure oil pool on the back of the orbiting scroll, that is, the side away from the fixed scroll, is too large, especially under high pressure difference conditions, the clamping force between the end faces of the orbiting scroll and the fixed scroll will be significantly enhanced, which will not only increase the friction power consumption of the compressor, but also increase the risk of engagement and wear of the pump body, thus posing a threat to the reliability of the compressor. Therefore, it is usually designed to avoid excessive exhaust area on the back. However, this design also has a disadvantage, that is, under light load conditions, there may be a problem of insufficient sealing force, which may cause 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 comprises a support, a movable scroll placed on the support, and a fixed scroll engaged with the movable scroll; wherein:

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

[0008] The fixed scroll is provided with an adjusting component, 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, thereby reducing or increasing the exhaust area at the bottom of the movable scroll.

[0009] Among them, the fixed scroll disk is provided with a medium-pressure introduction channel, and the medium-pressure introduction channel is connected to the compression chamber formed between the fixed scroll disk and the movable scroll disk; the outer side of the fixed scroll disk is provided with an exhaust transfer channel, and the exhaust transfer channel is used to transfer high-pressure gas; the regulating component is used to drive the medium-pressure introduction channel or the exhaust transfer channel to communicate with the sealing groove.

[0010] Among them, 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.

[0011] Among them, the outer wall and inner wall of the fixed scroll are respectively provided with an air inlet and an air suction port, an adjustment groove is provided between the air inlet and the air suction port, the adjustment groove connects the air inlet and the air suction port, and the adjustment component is arranged in the adjustment groove; the air suction port is connected to the air suction cavity formed between the inner wall of the fixed scroll and the outer wall of the movable scroll, and the air inlet is connected to the exhaust transmission channel.

[0012] Wherein, the regulating component includes: an elastic member and a regulating valve; the regulating valve is movably connected to the regulating groove, 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 air 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.

[0013] In which, 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 air inlet, 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 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 with 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 with the first channel.

[0014] Wherein, the air inlet is provided with a plug, and the plug is provided with a flow hole, and the flow hole is connected with the adjustment groove and the exhaust transmission channel.

[0015] Wherein, a placing portion and a limiting portion are provided on the top of the support, the limiting portion is provided on the outer periphery of the placing portion, and extends from the placing portion toward the direction of the fixed scroll; the movable scroll is placed between the placing portion and the limiting portion, and the placing portion and the limiting portion respectively abut against the bottom of the movable scroll and the bottom of the fixed scroll; the sealing groove extends from the limiting portion to the placing portion.

[0016] Wherein, a receiving groove is provided on the placement portion, and the receiving groove is provided between the sealing member and the limiting portion, and a gap between the placement portion and the movable scroll and the receiving groove form an intermediate cavity.

[0017] In a second aspect, the present invention provides a compressor comprising the above-mentioned back pressure regulating structure.

[0018] Compared with the prior art, the present invention has the following beneficial effects: the present invention controls the seal to float up and down through an adjusting component to block or connect the exhaust chamber and the middle chamber, and can adapt to the different requirements of heavy load conditions and light load conditions for the exhaust area of ​​the movable scroll. Under heavy load conditions, the seal blocks the exhaust chamber and the middle chamber, so that the exhaust area on the back of the movable scroll is the exhaust chamber area, which can reduce the contact force of the pump body while ensuring high exhaust, thereby reducing the risk of bite wear. Under light load conditions, the seal connects the exhaust chamber and the middle chamber, increases the exhaust area on the back of the movable scroll, effectively avoids the overturning of the movable scroll, and thereby improves the sealing of the pump body.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a compressor provided by the present invention;

[0021] Figure 2 A schematic diagram of the structure of a back pressure regulating structure provided by the present invention under light load conditions;

[0022] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of local A;

[0023] Figure 4 A schematic diagram of the structure of a back pressure regulating structure provided by the present invention under heavy load conditions;

[0024] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of local B;

[0025] Figure 6 A schematic diagram of the structure of a seal of a back pressure regulating structure provided by the present invention from a top view;

[0026] Figure 7 A schematic structural diagram of a regulating valve with a back pressure regulating structure provided by the present invention.

[0027] Reference numerals:

[0028] 1. Support; 11. Sealing groove; 111. First groove section; 112. Second groove section; 113. Third groove section; 114. Limiting groove section; 12. Sealing member; 13. Placement portion; 131. Accommodating groove; 14. Limiting portion;

[0029] 2. Orbital scroll; 21. Compression chamber; 22. Exhaust chamber; 23. Intermediate chamber;

[0030] 3. static vortex disk; 31. medium pressure introduction channel; 32. exhaust transmission channel; 33. first channel; 34. second channel; 35. air inlet; 36. air suction port; 37. regulating groove; 38. plug; 39. air suction chamber;

[0031] 4. Adjustment assembly; 41. Elastic member; 42. Adjustment valve; 421. First annular groove; 422. Second annular groove; 423. Connecting portion;

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

[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. The technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

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

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

[0036] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0037] Embodiment 1

[0038] See also Figure 1-7 As shown, this embodiment discloses a back pressure regulating structure. Figure 1 The back pressure regulating structure of the present embodiment is applied to a compressor, and further, the compressor is a scroll compressor. The back pressure regulating structure of the present embodiment includes a support 1, a movable scroll 2 placed on the support 1, and a fixed scroll 3 engaged with the movable scroll 2, and is used to adjust the exhaust area on the back of the movable scroll 2, that is, the side away from the fixed scroll 3.

[0039] Specifically, the support 1 is provided with a sealing groove 11 extending to the bottom of the movable scroll 2, and a sealing member 12 is provided in the sealing groove 11; the sealing member 12 divides the bottom of the movable scroll 2 into an exhaust chamber 22 and an intermediate chamber 23, and the exhaust chamber 22 and the intermediate chamber 23 are respectively arranged close to and far away from the center of the movable scroll 2; the fixed scroll 3 is provided with an adjusting component 4, and the adjusting component 4 is used to control the seal 12 to float up and down in the sealing groove 11 according to the pressure difference between the exhaust pressure and the suction pressure between the fixed scroll 3 and the movable scroll 2, so as to block or connect the exhaust chamber 22 and the intermediate chamber 23, and reduce or increase the exhaust area at the bottom of the movable scroll 2.

[0040] It is understandable that during the operation of the compressor, the pressure distribution on the back of the movable scroll 2 is uneven, wherein the central area of ​​the movable scroll 2 is connected to the oil pool through the crankshaft 7f, and is used to receive the oil pressure from the oil pool at the bottom of the compressor. Therefore, it is usually subject to a higher exhaust pressure, while the outer area is subject to a relatively low intermediate pressure or suction pressure. Therefore, the seal 12 divides the bottom area of ​​the movable scroll 2 into an exhaust chamber 22 close to or located in the central area, and an intermediate chamber 23 located outside the exhaust chamber 22.

[0041] The back pressure regulating structure of the present embodiment controls the seal 12 to float up and down by regulating the assembly 4 so as 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 reduce the contact force of the pump body while ensuring high exhaust, thereby reducing the risk of bite wear. Under light load conditions, the seal 12 connects the exhaust chamber 22 and the intermediate chamber 23, increases the exhaust area on the back of the movable scroll 2, effectively avoids the overturning of the movable scroll 2, and thereby improves the sealing of the pump body.

[0042] Specifically, the fixed scroll 3 is provided with a medium-pressure introduction channel 31, which is connected to the compression chamber 21 formed between the fixed scroll 3 and the movable scroll 2; an exhaust transfer channel 32 is provided on the outer side of the fixed scroll 3, and the exhaust transfer channel 32 is used to transfer high-pressure gas; the regulating component 4 is used to drive the medium-pressure introduction channel 31 or the exhaust transfer channel 32 to communicate with the sealing groove 11. The scroll teeth on the fixed scroll 3 and the scroll teeth of the movable scroll 2 are engaged with each other to form the compression chamber 21. After the low-pressure gas enters the compression chamber 21 from the fixed scroll 3, it is compressed by the eccentric rotation of the movable scroll 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 chamber 21 to form high-pressure gas and discharge from the exhaust chamber 22 to the compressor. The exhaust gas transmission channel 32 is used to transmit high-pressure gas. In actual application, the exhaust gas transmission channel 32 is located in the casing 6c of the compressor. There is high-pressure gas that needs to be discharged after compression in the casing 6c. The high-pressure gas on one side of the static scroll 3 is used to control the seal 12, which helps save energy and achieve green environmental protection. Therefore, under light load conditions, the top of the seal 12 is close to the movable scroll 2, and is affected by the combined effect of the medium pressure and the exhaust pressure. When the medium pressure introduction channel 31 is connected to the seal 12, the medium pressure gas provides thrust for the bottom of the seal 12, and the medium pressure gas is close to the medium pressure, both of which are relatively low medium pressures relative to the exhaust pressure. Therefore, the force on the top of the seal 12 is greater than the force on the bottom, causing the seal 12 to move downward, so that the exhaust area is spread over the back of the movable scroll 2, thereby increasing the pressure on the back of the movable scroll 2, so as to increase the pump body sealing coefficient, reduce leakage, and improve the sealing performance of the compressor. It also helps to improve the compression ratio and efficiency of the compressor, so that the compressor can compress low-pressure gas into high-pressure gas with higher efficiency. Under heavy load conditions, the top of the seal 12 is close to the orbiting scroll 2, and under the combined effect of the medium pressure and the exhaust pressure, the pressure on the top of the seal 12 is approximately the average of the medium pressure and the exhaust pressure, that is, less than the exhaust pressure. When the exhaust transmission channel 32 is connected to the seal 12, the high-pressure gas provides thrust for the bottom of the seal 12, and the pressure of the high-pressure gas is equivalent to the exhaust pressure under heavy load, both of which are higher than the medium pressure. Therefore, the force on the top of the seal 12 is less than the force on the bottom, causing the seal 12 to move up and close to the orbiting scroll 2, so that the exhaust area is limited by the exhaust chamber 22, thereby reducing the pressure on the back of the orbiting scroll 2, avoiding excessive pressure on the back of the orbiting scroll 2 causing large contact force on the pump body and causing bite wear, thereby ensuring the reliability of the compressor.

[0043] It is understandable that the exhaust gas transfer channel 32 can be formed by the gap between the outer wall of the fixed scroll 3 and the compressor casing 6c, or can be realized by an external pipe. The exhaust gas transfer channel 32 of this embodiment is the outer area of ​​the fixed scroll 3. In actual application, the high-pressure gas to be discharged flows in the casing 6c and is transferred to the exhaust gas transfer channel 32 so as to enter the sealing groove 11 and realize the position adjustment of the sealing member 12.

[0044] Specifically, the fixed scroll 3 is provided with a first channel 33 and a second channel 34, and the first channel 33 and the second channel 34 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 medium-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, and then adjust the position of the seal 12; the second channel 34 is used to balance the movable scroll 2, so as to avoid the seal 12 closing the intermediate cavity 23 under heavy load conditions, so that the movable scroll 2 is only affected by the exhaust gas pressure and the contact force between the movable scroll 2 and the fixed scroll 3 is too large, and the second channel 34 is connected to the medium-pressure introduction channel 31, and the medium-pressure gas can be introduced into the intermediate cavity 23, so that the movable scroll 2 remains balanced, so as to reduce the risk of pump body wear and ensure the operating stability and reliability of the compressor.

[0045] Specifically, the outer wall and inner wall of the fixed scroll 3 are respectively provided with an air inlet 35 and an air suction port 36, an adjusting groove 37 is provided between the air inlet 35 and the air suction port 36, the adjusting groove 37 is connected with the air inlet 35 and the air suction port 36, and the adjusting component 4 is arranged in the adjusting groove 37; the air suction port 36 is connected with the air suction chamber 39 formed between the inner wall of the fixed scroll 3 and the outer wall of the movable scroll 2, and the air inlet 35 is connected with the exhaust transmission channel 32. The air suction chamber 39 is located at the periphery of the compression chamber 21, more specifically, the air suction chamber 39 is an opening gap between the fixed scroll 3 and the movable scroll 2, for low-pressure gas to enter between the fixed scroll 3 and the movable 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 regulating assembly 4 includes: an elastic member 41 and a regulating valve 42; the regulating valve 42 is movably connected to the regulating groove 37, the elastic member 41 is arranged between the air inlet 36 and the regulating valve 42, and the elastic member 41 drives the regulating valve 42 to move along the regulating groove 37 according to the suction and exhaust 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 regulating groove 37. The suction and exhaust pressure difference is the pressure difference between the exhaust pressure and the suction pressure. In the scroll compressor, the suction and exhaust pressure difference is an important indicator reflecting the compressor's working load and internal pressure state. When the compressor is in a light load condition, the suction and exhaust pressure difference is relatively small, and when the compressor is in a heavy load condition, the suction and exhaust pressure difference is relatively large. Therefore, the back pressure regulating structure of this embodiment detects the operating state of the compressor through the suction and exhaust pressure difference of the suction chamber 39, and adjusts the lifting and lowering of the seal 12 according to whether the compressor is in a heavy load or light load operating state, and then adjusts the exhaust area of ​​the back of the movable scroll 2 to ensure the stable operation of the compressor.

[0047] Specifically, the regulating valve 42 is provided with a first annular groove 421 and a second annular groove 422. The first annular groove 421 is provided at one end of the regulating valve 42 close to the air inlet 35, and the second annular groove 422 is provided in the middle of the regulating valve 42, and there is a gap between the first annular groove 421 and the second annular groove 422. When the first annular groove 421 moves to the first channel 33 and the second annular groove 422 moves to the upper part of the second channel 34, the exhaust gas transmission channel 32 and the medium pressure introduction channel 31 are respectively connected with the first channel 33 and the second channel 34. When the second annular groove 422 moves to the upper part of the first channel 33, the medium pressure introduction channel 31 is connected with the first channel 33. The first annular groove 421 and the second annular groove 422 are formed by the surface of the regulating valve 42 being concave around the center, so that a gap is formed between the regulating groove 37 and the regulating groove 37 at the first annular groove 421 and the second annular groove 422, so that the first channel 33 and the second channel 34, the exhaust gas transmission channel 32 and the medium pressure introduction channel 31 are connected with the regulating groove 37.

[0048] Specifically, the air inlet 35 is provided with a plug 38, and the plug 38 is provided with a flow hole, and the flow hole is connected to the adjustment groove 37 and the exhaust transfer channel 32. The plug 38 is used to limit the movement of the regulating valve 42 to prevent the regulating valve 42 from flying out of the air inlet 35 under the elastic action of the elastic member 41. The plug 38 ensures the reliability and durability of the regulating component 4; the setting of the flow hole ensures that the gas flow between the exhaust transfer channel 32 and the adjustment groove 37 is smooth and controllable, which helps to further adjust the flow rate of the gas by adjusting the size or number of the flow holes, thereby realizing fine adjustment of the back pressure of the movable scroll 2.

[0049] In specific implementation, when the suction and exhaust pressure difference is less than the preset P value, that is, when the compressor is in a light load condition, the suction and exhaust pressure difference generates a force F1 that is less than the elastic force F2 of the elastic member 41, the elastic member 41 stretches, and the regulating valve 42 moves in a direction away from the suction port 36 under the action of the pressure difference and the pushing action of the elastic member 41 until the regulating valve 42 contacts the plug 38. At this time, the second annular groove 422 is located above the first channel 33, so that the regulating groove 37 connects the medium-pressure introduction channel 31 and the first channel 33, and 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 The bottom of the seal 12 is in contact with the top of the seal 12, and the pressure is approximately the average pressure of the exhaust chamber 22 and the intermediate chamber 23, which is greater than the thrust of the intermediate pressure gas on the bottom of the seal 12, so that the seal 12 drops, and the high-pressure gas gathered in the exhaust chamber 22 enters the intermediate chamber 23, increasing the exhaust area of ​​the back of the movable scroll 2, so that the pressure on the back of the movable scroll 2 increases, resulting in an increase in the pump body sealing coefficient and reducing pump body leakage; when the suction and exhaust pressure difference is greater than the preset P value, that is, when the compressor is under heavy load, the suction and exhaust pressure difference generates a force F1 greater than the elastic force F2 of the elastic member 41, and the elastic member 41 is compressed to adjust The valve 42 moves toward the air inlet 36 under the action of the pressure difference and the pulling force of the elastic member 41 until the regulating valve 42 abuts against the groove wall of the regulating groove 37 at one end close to the air inlet 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 exhaust transmission channel 32 is connected to the first channel 33, and the high-pressure gas enters the first channel 33 through the exhaust 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 approximately the average pressure of the exhaust chamber 22 and the middle chamber 23, which is less than the pressure at the bottom of the sealing member 12. The thrust of the medium-pressure gas causes the seal 12 to rise to be close to the movable scroll 2, thereby blocking the gas in the exhaust chamber 22 from entering the intermediate chamber 23, reducing the exhaust area on the back of the movable scroll 2, reducing the pressure on the back of the movable scroll 2, and further reducing the clamping force between the movable scroll 2 and the static scroll 3, reducing the engagement friction loss of the pump body, and extending the service life of the compressor. 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, providing the intermediate pressure for the intermediate chamber 23, ensuring that the movable scroll 2 maintains dynamic balance and ensuring smooth operation of the compressor.

[0050] In this embodiment, the regulating groove 37 is a circular groove, the regulating valve 42 and the plug 38 are cylindrical, the outer wall of the regulating valve 42 and the outer wall of the plug 38 are in contact with the regulating groove 37, and there is a gap between the first annular groove 421 and the second annular groove 422 and the regulating groove 37. The regulating groove 37 and the plug 38 are adapted to the shape of the regulating valve 42, ensuring that the outer wall of the regulating valve 42 can be closely fitted to the inner wall of the regulating groove 37 to avoid the disorderly mixing of the gas and reduce or increase the original pressure value of the gas. The gap between the first annular groove 421 and the second annular groove 422 and the regulating groove 37 provides a necessary channel for the circulation of the gas, so as to realize the connection between the medium pressure introduction channel 31 and the first channel 33 or the second channel 34, or the exhaust transmission channel 32 and the first channel 33, so that the movable scroll 2 can adapt to the pressure requirements of different working conditions.

[0051] It is understandable that in other embodiments, the shapes of the regulating valve 42 and the plug 38 and the groove shape of the regulating groove 37 can be adjusted to a triangle, a pentagon, a hexagon or other shapes according to actual needs.

[0052] In this embodiment, the elastic member 41 is a coil spring, and a connecting portion 423 is provided at one end of the regulating valve 42 away from the first annular groove 421. The diameter of the connecting portion 423 is smaller than the maximum diameter of the regulating valve 42. The coil spring is sleeved on the connecting portion 423, and the two ends of the coil spring are respectively connected to the regulating valve 42 and the groove wall of the regulating groove 37 away from the end of the second annular groove 422. The coil spring is compressed, pulling the regulating valve 42 to move toward the air inlet 36, so that the first annular groove 421 and the second annular groove 422 are respectively located above the first channel 33 and the second channel 34; the coil spring restores its own elasticity, pushing the regulating valve 42 to move toward the air inlet 35, so that the second annular groove 422 and the second annular groove 422 are respectively located above the first channel 33 and the second channel 34.

[0053] It is understandable that in other embodiments, a rubber spring, a disc spring, a spring sheet or an elastic member 41 is used to replace the coil spring, and the connection method between the elastic member 41 and the regulating valve 42 can be adjusted according to actual needs.

[0054] Specifically, a placement portion 13 and a limiting portion 14 are provided on the top of the support 1. The limiting portion 14 is provided on the outer periphery of the placement portion 13 and extends from the placement portion 13 toward the fixed scroll 3. The movable scroll 2 is placed between the placement portion 13 and the limiting portion 14. The placement portion 13 and the limiting portion 14 abut against the bottom of the movable scroll 2 and the bottom of the fixed scroll 3 respectively. The sealing groove 11 extends from the limiting portion 14 to the placement portion 13. The placement portion 13 provides support for the movable scroll 2. The limiting portion 14 is used to limit the movement of the movable scroll 2 to prevent the movable scroll 2 from separating from the placement portion 13 when performing eccentric rotation. The setting of the limiting portion 14 ensures the stability of the compressor operation and provides a basis for adjusting the back pressure of the movable scroll 2. The limiting portion 14 is connected to the fixed scroll 3, ensuring 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 ensuring the continuity and reliability of the back pressure adjustment of the movable scroll 2.

[0055] It is understandable that in other embodiments, there is a distance between the limiting portion 14 and the fixed scroll 3, and the first channel 33 and the second channel 34 are connected to the sealing groove 11 and the intermediate cavity 23 through an external pipe to replace the limiting portion 14 of this embodiment abutting the bottom of the fixed scroll 3.

[0056] Specifically, a receiving groove 131 is provided on the placement portion 13, and the receiving groove 131 is provided between the seal 12 and the limiting portion 14. The gap between the placement portion 13 and the movable scroll 2 and the receiving groove 131 form an intermediate cavity 23. The existence of the receiving groove 131 enables the pressure of the intermediate cavity 23 to be more smoothly and continuously transmitted to the back of the movable scroll 2, avoiding the shaking or overturning of the movable scroll 2 caused by sudden pressure changes, helping to improve the operating stability of the compressor, reducing the wear caused by vibration and impact, and extending the service life of the compressor. And directly integrating the receiving groove 131 on the top of the placement portion 13 not only simplifies the overall design of the back pressure adjustment structure, but also improves the space utilization rate, making the overall structure compact, and helping to reduce the manufacturing cost and maintenance difficulty of the compressor.

[0057] Specifically, the sealing groove 11 includes a first groove section 111, a second groove section 112, a third groove section 113 and a limiting groove section 114 which are connected in sequence. The first groove section 111, the third groove section 113 and the limiting groove section 114 are arranged along the axial direction of the support 1, and the second groove section 112 is arranged along the radial direction of the support 1; the first groove section 111 is arranged in the limiting portion 14 and is connected 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 is connected with 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 movable scroll 2, and the end of the limiting groove section 114 away from the third groove section 113 is open; the groove width of the third groove section 113 is smaller than the groove width of the limiting groove section 114; the sealing member 12 is movably connected in the limiting groove section 114, and the outer wall of the sealing member 12 is arranged to fit the inner wall of the limiting groove section 114. The medium-pressure gas or the high-pressure gas sequentially enters the first slot section 111, the second slot section 112, the third slot section 113 and the limiting slot section 114, so that the seal 12 rises and falls in the limiting slot section 114. The limiting slot section 114 is used to limit the movement of the seal 12, prevent the seal 12 from leaving the sealing slot 11, and shorten the moving distance of the seal 12, so that a smaller portion of gas can be used to drive the seal 12 to move, thereby improving the response efficiency of the back pressure regulation.

[0058] In this embodiment, the seal 12 is made of PTFE. PTFE (full name: Polytetrafluoroethyl ene, i.e. polytetrafluoroethylene) is a polymer compound formed by polymerization of tetrafluoroethylene, and has excellent chemical stability, corrosion resistance, sealing, high lubricity and non-stickiness, electrical insulation and good anti-aging resistance. PTFE has a wide operating temperature range and can work for a long time at a temperature of -190 to 250°C. In addition, it also has an extremely low friction coefficient and surface tension, which can reduce the friction resistance of the seal 12 during movement.

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

[0060] In this embodiment, the limiting groove section 114 is a circular groove, and the sealing member 12 is a cylindrical member. The shapes of the limiting groove section 114 and the sealing member 12 are adapted to each other, which improves the fit and sealing performance between the two. The regularity and roundness of the circular groove and the cylindrical member enable the sealing member 12 to maintain a stable motion trajectory during the lifting and floating process, reducing friction and wear, extending the service life of the sealing member 12, reducing maintenance costs, and providing a strong guarantee for the long-term and efficient operation of the compressor. At the same time, the smoothness of the movement of the sealing member 12 is improved, and the response efficiency and accuracy of the back pressure regulation of the movable scroll 2 are further improved.

[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] Embodiment 2

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

[0064] The compressor of this embodiment realizes self-driving 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, which helps to improve the market competitiveness of the compressor.

[0065] Specifically, the compressor of this embodiment further includes: an air intake pipe 5a, an upper cover 6a, an upper bearing 7a, a casing 6c, an upper thrust plate 7b, a main balance block 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 balance block 7i and an exhaust pipe 5b. The air intake pipe 5a is arranged on the upper cover 6a and connected to the fixed scroll 3, and is used to introduce low-pressure gas for compression in the compression chamber 21 between the fixed scroll 3 and the movable scroll 2; the upper bearing 7a is arranged on the side of the support 1 away from the movable scroll 2, and is sleeved outside the crankshaft 7f, and the crankshaft 7f is connected to the movable scroll 2, and is used to drive the movable scroll 2 to perform eccentric rotation on the support 1, so that the compression chamber 21 is gradually compressed, and then the low-pressure gas is compressed into high-pressure gas, and the gas is discharged from the exhaust pipe 5b connected to the casing 6c and located on the side of the support 1 away from the movable scroll 2. The lower cover 6b is connected to the bottom of the casing 6c, and the lower cover 6b contains the oil pool; the crankshaft 7f is axially provided with an oil channel, and the oil channel is connected to the oil pool; the upper thrust plate 7b is connected to the side of the support 1 away from the movable scroll 2, and is in clearance with the crankshaft 7f; one end of the return oil pipe 8 is connected to the support 1, and the other end is connected to the oil pool; the main balance block 7c and the auxiliary balance block 7i are symmetrically arranged on the crankshaft 7f, and are respectively located on the upper and lower sides of the stator 7d; the stator 7d is fixed to the casing 6c, and the rotor 7e is rotatably arranged in the stator 7d and connected to the crankshaft 7f; the lower end of the crankshaft 7f is penetrated by the lower bearing 7h and the bracket 7g supporting the lower bearing 7h, and the oil pump 9 is connected to the side of the bracket 7g close to the lower cover 6b. Each structure of the compressor is closely connected and cooperates together to realize the compression and discharge of the gas. Through the introduction of the back pressure adjustment structure, the compressor can automatically adjust the exhaust area on the back of the movable scroll 2 according to the workload, thereby optimizing performance and efficiency.

[0066] The present invention provides a back pressure regulating structure and a compressor, which control the up and down floating of the seal by regulating the assembly to block or connect the exhaust chamber and the middle chamber, and can adapt to the different requirements of heavy load conditions and light load conditions for the exhaust area of ​​the movable scroll. Under heavy load conditions, the seal blocks the exhaust chamber and the middle chamber, so that the exhaust area on the back of the movable scroll is the exhaust chamber area, which can reduce the contact force of the pump body while ensuring high exhaust, thereby reducing the risk of bite wear. Under light load conditions, the seal connects the exhaust chamber and the middle chamber, increases the exhaust area on the back of the movable scroll, effectively avoids the overturning of the movable scroll, and thereby improves the sealing of the pump body.

[0067] The above examples are only used to further illustrate the technical content of the present invention, so that readers can understand it more easily, but they do not mean that the implementation of the present invention is limited to this. Any technical extension or re-creation made according to the present invention is protected by the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A back pressure regulating structure, comprising a support, a movable scroll placed on the support, and a fixed scroll engaged with the movable scroll, characterized in that: The support is provided with a sealing groove extending to the bottom of the movable scroll, and a sealing member is provided in the sealing groove; the sealing member divides the bottom of the movable scroll into an exhaust cavity and an intermediate cavity, and the exhaust cavity and the intermediate cavity are respectively arranged close to and far from the center of the movable scroll; The fixed scroll is provided with an adjusting component, 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, thereby reducing or increasing the exhaust area at the bottom of the movable scroll.

2. The back pressure regulating structure according to claim 1, characterized in that: The fixed scroll is provided with a medium-pressure introduction channel, and the medium-pressure introduction channel is connected to the compression chamber formed between the fixed scroll and the movable scroll; an exhaust transfer channel is provided on the outer side of the fixed scroll, and the exhaust transfer channel is used to transfer high-pressure gas; the regulating component is used to drive the medium-pressure introduction channel or the exhaust transfer channel to communicate with the sealing groove.

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 wall and inner wall of the fixed scroll are respectively provided with an air inlet and an air suction port, an adjustment groove is provided between the air inlet and the air suction port, the adjustment groove connects the air inlet and the air suction port, and the adjustment component is arranged in the adjustment groove; the air suction port is connected to the air suction cavity formed between the inner wall of the fixed scroll and the outer wall of the movable scroll, and the air inlet is connected to the exhaust transmission channel.

5. The back pressure regulating structure according to claim 4, characterized in that: 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 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 air 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 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 air inlet, 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 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 with 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 with the first channel.

7. The back pressure regulating structure according to claim 6, characterized in that: The air inlet is provided with a plug, and the plug is provided with a flow hole, and the flow hole is connected with the adjustment groove and the exhaust transmission channel.

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

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

10. A compressor, characterized in that: It comprises the back pressure regulating structure as described in any one of claims 1 to 9.

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