Pump assembly and scroll compressor

Abstract

The present application provides a pump body assembly and a scroll compressor. The pump body assembly includes a compression chamber and a back pressure chamber connected through an air guide channel, the compression chamber includes at least a first compression chamber and a second compression chamber, the gas pressure of the first compression chamber is greater than the gas pressure of the second compression chamber; the pump body assembly also includes a partition arranged in the back pressure chamber, the partition divides the back pressure chamber into at least two low pressure chambers and high pressure chambers with different air pressures; the first compression chamber corresponds to and is connected to the high pressure chamber, and the second compression chamber corresponds to and is connected to the low pressure chamber. The present application sets a partition in the back pressure chamber, so that there are two relatively independent chambers with different air pressures in the back pressure chamber, so as to realize different axial forces in the back pressure chamber, achieve axial balance with different compression chambers, reduce the overturning moment of the movable scroll, optimize the end face wear of the two movable and fixed scrolls, and improve high-speed reliability.

Description

Technical Field

[0001] The present application belongs to the technical field of scroll compressors, and in particular relates to a pump body assembly and a scroll compressor. Background Art

[0002] A scroll compressor is a type of positive displacement compressor. The compression components consist of a movable scroll and a fixed scroll. During the compression process, the relative orbital motion of the movable and fixed scrolls is used to form a continuous change in the closed volume, thereby achieving the purpose of compressing the gas. Because the closed chamber formed when the movable and fixed scrolls are engaged has a certain gas pressure, the movable scroll will be subjected to an axial gas force in the opposite direction of the fixed scroll during compression. In order to increase the life of the bearing, reduce the damage of the axial force to the bearing in high-speed operation, and reduce the wear of the scroll and leakage in the compression chamber caused by unbalanced axial force, it is particularly necessary to adopt a structural design that can balance the axial gas force of the movable scroll.

[0003] Most existing scroll compressor designs adopt a back-pressure chamber structure. By arranging upper brackets, shaft seals and other components on the back of the movable scroll, a closed chamber is formed on the back of the movable scroll. The refrigerant at an intermediate pressure between the suction pressure and the exhaust pressure is introduced into this closed chamber. Due to the existence of gas pressure, an axial thrust toward the fixed scroll is generated on the movable scroll, thereby balancing the axial gas force generated by the compression chamber.

[0004] In a conventional back-pressure chamber structure, the force generated by the closed chamber is the same in direction at 360°. However, the pressure generated by the compression chamber formed by the two scroll plates is uneven in the circumferential direction. Specifically, the compression chamber pressure at the suction end is smaller, while the compression chamber pressure at the compression end is larger. This uneven force will generate an overturning moment on the movable scroll, resulting in eccentric wear of the two scroll plates when the scroll compressor is working, which is particularly serious during ultra-high-speed operation.

[0005] In the prior art, there is a split static scroll structure, which reduces the suspended area at the suction port and achieves overturning moment balance through the thrust difference generated by the area difference, eliminating the eccentric wear phenomenon of the two scrolls. However, this structure reduces the suction cavity area, and the suction volume is insufficient when the compressor is running at ultra-high speed, which will lead to performance degradation. Summary of the invention

[0006] Therefore, the present application provides a pump body assembly and a scroll compressor, which can solve the problem in the prior art that the split static scroll structure reduces the suction chamber area, resulting in insufficient suction volume when the compressor runs at ultra-high speed, leading to performance degradation.

[0007] In order to solve the above problems, the present application provides a pump body assembly, including a compression chamber and a back pressure chamber connected through an air guide channel.

[0008] The compression chamber at least includes a first compression chamber and a second compression chamber, and the gas pressure of the first compression chamber is greater than the gas pressure of the second compression chamber;

[0009] The pump assembly further comprises a partition disposed in the back pressure chamber, wherein the partition divides the back pressure chamber into at least two low pressure chambers and a high pressure chamber with different air pressures;

[0010] The first compression chamber corresponds to and is in communication with the high-pressure chamber, and the second compression chamber corresponds to and is in communication with the low-pressure chamber.

[0011] Optionally, the pump body assembly includes a fixed scroll, a movable scroll and an upper bracket which are arranged in sequence, the fixed scroll and the movable scroll form the first compression chamber and the second compression chamber; the movable scroll and the upper bracket form the back pressure chamber; both sides of the partition are sealed against the movable scroll and the upper bracket, and a portion of the outer wall of the partition is in sealing contact with the inner wall of the back pressure chamber, thereby forming a partition for the back pressure chamber.

[0012] Optionally, the separator comprises a cross slip ring, and the cross slip ring comprises a ring body; the low-pressure chamber and the high-pressure chamber are both located outside the ring body.

[0013] Optionally, a groove is provided on one side of the upper bracket close to the movable scroll plate, and the movable scroll plate and the cross slip ring are overlapped in the groove; a key groove is provided on the side wall of the groove, and the cross slip ring also includes a sliding key, and the sliding key is sealed in the key groove, and the low-pressure chamber and the high-pressure chamber are respectively arranged on both sides of the sliding key.

[0014] Optionally, the side wall of the sliding key and the side wall of the keyway are configured to be in sealed sliding fit.

[0015] Optionally, at least two air guiding channels are provided, the first compression chamber is connected to the high-pressure chamber through a part of the air guiding channels, and the second compression chamber is connected to the low-pressure chamber through another part of the air guiding channels.

[0016] Optionally, one section of the air guide passage is arranged in the fixed scroll plate, and the other section is arranged in the upper bracket.

[0017] According to another aspect of the present application, a scroll compressor is provided, comprising the pump body assembly as described above.

[0018] The present application provides a pump body assembly, comprising a compression chamber and a back-pressure chamber connected via an air guide channel, wherein the compression chamber comprises at least a first compression chamber and a second compression chamber, the gas pressure of the first compression chamber being greater than the gas pressure of the second compression chamber; the pump body assembly also comprises a partition arranged in the back-pressure chamber, the partition divides the back-pressure chamber into at least two low-pressure chambers and a high-pressure chamber with different gas pressures; the first compression chamber corresponds to and is connected to the high-pressure chamber, and the second compression chamber corresponds to and is connected to the low-pressure chamber.

[0019] The present application arranges a partition in the back-pressure chamber so that the back-pressure chamber has two relatively independent chambers with different air pressures, thereby realizing different axial forces in the back-pressure chamber, achieving axial balance with different compression chambers, reducing the overturning moment of the movable scroll, optimizing the end face wear of the two movable and fixed scrolls, and improving high-speed reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a pump assembly according to an embodiment of the present application;

[0021] Figure 2 It is a cross-sectional structural diagram of the compression chamber of an embodiment of the present application;

[0022] Figure 3 This is a flow guide cross-sectional view of the second compression chamber of an embodiment of the present application;

[0023] Figure 4 This is a flow guide cross-sectional view of the first compression chamber of an embodiment of the present application;

[0024] Figure 5 It is the force diagram of the overturning moment of the orbiting scroll in the traditional scroll compressor;

[0025] Figure 6 This is a force diagram of the movable scroll of an embodiment of the present application;

[0026] Figure 7 The schematic diagram is a principle diagram of the operation of an embodiment of the present application.

[0027] The reference numerals are:

[0028] 1. Upper bracket; 11. Keyway; 2. Orbital scroll; 21. First compression chamber; 22. Second compression chamber; 231. High-pressure air duct; 232. Low-pressure air duct; 3. Cross slip ring; 31. Sliding key; 4. Fixed scroll; 5. Housing; 6. Crankshaft; 7. Upper cover; 8. High-pressure chamber; 9. Low-pressure chamber. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] See also Figures 1 to 7 As shown, according to an embodiment of the present application, a pump body assembly includes a compression chamber and a back pressure chamber connected via an air guide channel 23,

[0032] The compression chamber at least includes a first compression chamber 21 and a second compression chamber 22, and the gas pressure of the first compression chamber 21 is greater than the gas pressure of the second compression chamber 22;

[0033] The pump assembly further comprises a partition disposed in the back pressure chamber, wherein the partition divides the back pressure chamber into at least two low pressure chambers 9 and a high pressure chamber 8 with different air pressures;

[0034] The first compression chamber 21 corresponds to and is in communication with the high-pressure chamber 8 , and the second compression chamber 22 corresponds to and is in communication with the low-pressure chamber 9 .

[0035] The present application sets a partition in the back-pressure chamber, so that the back-pressure chamber has two relatively independent chambers with different air pressures, so as to realize different axial forces in the back-pressure chamber, achieve axial balance with different compression chambers, reduce the overturning moment of the movable scroll 2, optimize the end face wear of the two movable and fixed scrolls, and improve high-speed reliability.

[0036] The compression chamber includes a first compression chamber 21 and a second compression chamber 22 with different gas pressures, which can provide gas pressure to the high-pressure chamber 8 and the low-pressure chamber 9 respectively. When the first compression chamber 21 corresponds to the high-pressure chamber 8, and the second compression chamber 22 corresponds to the low-pressure chamber 9, they are balanced with each other and no overturning moment is generated.

[0037] like Figure 5 As shown, in the structure of the traditional pump body assembly, the back pressure on the bottom of the movable scroll 2 is uniform, both F1; the compression chamber pressure on the top of the movable scroll 2 is affected by the high-pressure chamber 8 and the low-pressure chamber 9, and the forces are respectively low pressure F3 and high pressure F4; the unbalanced upper and lower forces produce an unbalanced moment around the horizontal direction on the movable scroll 2, causing the movable scroll 2 to overturn, and finally causing wear on the surfaces of the movable scroll 2 and the fixed scroll 4 that are in contact with greater forces, and the higher the speed, the more severe the wear.

[0038] The application is subject to force, such as Figure 6 and 7 As shown, the compression chamber pressure on the top of the movable scroll 2 is affected by the high-pressure chamber 8 and the low-pressure chamber 9, and the forces are respectively low pressure F3 and high pressure F4; the back pressure on the bottom of the movable scroll 2 is uneven, the low-pressure chamber 9 corresponds to the low pressure F3, providing a force F1, and the high-pressure chamber 8 corresponds to the high pressure F4, providing a force F2, wherein F2 is greater than F1, so that there will be no unbalanced force between the upper and lower parts to generate an unbalanced torque around the horizontal direction on the movable scroll 2.

[0039] In some embodiments, the pump body assembly includes a fixed scroll 4, a movable scroll 2 and an upper bracket 1 which are arranged in sequence, the fixed scroll 4 and the movable scroll 2 enclose the first compression chamber 21 and the second compression chamber 22; the movable scroll 2 and the upper bracket 1 enclose the back pressure chamber; both sides of the partition are sealed against the movable scroll 2 and the upper bracket 1, and a portion of the outer wall of the partition is in sealing contact with the inner wall of the back pressure chamber, thereby forming a partition for the back pressure chamber.

[0040] The fixed scroll 4, the movable scroll 2 and the upper bracket 1 form a compression chamber and a back pressure chamber on both sides of the movable scroll 2. Combined with the sealing settings on both sides and the outer wall of the partition, the back pressure chamber completes the separation setting of the low-pressure chamber 9 and the high-pressure chamber 8. At the same time, the compression chamber itself formed by the fixed scroll 4 and the movable scroll 2 has different small chambers, which can constitute the first compression chamber 21 and the second compression chamber 22.

[0041] More preferably, the separator comprises a cross slip ring 3, and the cross slip ring 3 comprises a ring body; the low-pressure chamber 9 and the high-pressure chamber 8 are both located outside the ring body.

[0042] The traditional cross ring 3 is arranged between the movable scroll 2 and the upper bracket 1, and can limit the rotation of the movable scroll 2. However, in the conventional structure, the cross ring 3 only slides in the back pressure chamber and has no sealing effect. The present application adjusts the cross ring 3 so that both axial end faces are sealed and slide, so that there are two different pressure areas on the outer periphery of the cross ring 3: a low pressure chamber 9 and a high pressure chamber 8, which can reduce the overturning moment of the movable scroll 2 and optimize the end face wear of the movable and fixed scrolls.

[0043] In some embodiments, a groove is provided on one side of the upper bracket 1 close to the movable scroll 2, and the movable scroll 2 and the cross ring 3 are overlapped and arranged in the groove; a key groove 11 is provided on the side wall of the groove, and the cross ring 3 further includes a sliding key 31, and the sliding key 31 is sealed and arranged in the key groove 11, and the low-pressure chamber 9 and the high-pressure chamber 8 are respectively arranged on both sides of the sliding key 31. Preferably, the side wall of the sliding key 31 and the side wall of the key groove 11 are set to be sealed and slidably matched.

[0044] The specific setting structure of the cross ring 3 in the back pressure chamber can be that the key groove 11 is set on the side wall of the groove of the upper bracket 1, and the side of the sliding key 31 of the cross ring 3 and the side of the key groove 11 are sealed and slidably matched, so that the two sides of the sliding key 31 can form a low-pressure chamber 9 and a high-pressure chamber 8.

[0045] One end face of the cross ring 3 and the upper surface of the upper bracket 1, the side face of the cross ring 3 and the key groove 11 of the upper bracket 1, and the other end face of the cross ring 3 and the bottom surface of the movable scroll 2 are all sealed and slidably matched, dividing the back pressure chamber into a high pressure chamber 8, a low pressure chamber 9 and an inner chamber, where the inner chamber refers to the area inside the ring, and this application only uses the high pressure chamber 8 and the low pressure chamber 9. The cross ring 3 only moves horizontally while maintaining a sealed state at all times to ensure the isolation of each cavity of the back pressure chamber.

[0046] In some embodiments, the air guide passages are provided with at least two: a high-pressure air guide passage 231 and a low-pressure air guide passage 232. The first compression chamber 21 is connected to the high-pressure chamber 8 via a portion of the air guide passage, and the second compression chamber 22 is connected to the low-pressure chamber 9 via another portion of the air guide passage. Optionally, one section of the air guide passage is provided in the fixed scroll 4, and the other section is provided in the upper bracket 1.

[0047] The first compression chamber 21 is connected to the high-pressure chamber 8 via the high-pressure air duct 231, and the second compression chamber 22 is connected to the low-pressure chamber 9 via the low-pressure air duct 232. The specific arrangement of the air duct can be divided into sections, one section is arranged in the fixed scroll 4, and the other section is arranged in the upper bracket 1, which is simple to manufacture, and reduces the weight of the equipment and the use of consumables.

[0048] According to another aspect of the present application, a scroll compressor is provided, comprising the pump body assembly as described above.

[0049] The present application can directly adopt the cross slip ring 3 on the scroll compressor as a separator of the back pressure chamber, and divide the back pressure chamber between the upper bracket 1 and the movable scroll 2 into two high and low chambers, and then use the high and low pressures to introduce the compression chambers of the two movable and fixed scrolls respectively, so as to achieve axial balance between the pressure of the back pressure chamber and the pressure of the compression chamber, reduce the overturning moment of the movable scroll 2, optimize the end face wear of the two movable and fixed scrolls, and improve high-speed reliability.

[0050] In the cavity surrounded by the housing 5 and the upper cover 7 of the scroll compressor, the pump body assembly is mainly composed of an upper bracket 1, a cross ring 3, a movable scroll 2, and a fixed scroll 4. The two axial end faces of the cross ring 3 are in sealing contact with the surface of the back pressure chamber of the upper bracket 1 and the bottom surface of the movable scroll 2, respectively, dividing the back pressure chamber into a high pressure chamber 8 and a low pressure chamber 9. The pressure of the back pressure chamber comes from the compression chambers of the movable and fixed scrolls, respectively. The first compression chamber 21, i.e., the high pressure chamber 8, formed by the compression of the movable scroll 2 and the fixed scroll 4 introduces the pressure into the high pressure chamber 8 of the back pressure chamber through the high pressure air duct 231 on the upper bracket 1; the second compression chamber 22, i.e., the low pressure chamber 9, formed by the compression of the movable scroll 2 and the fixed scroll 4 introduces the pressure into the low pressure chamber 9 of the back pressure chamber through the low pressure air duct 232 on the upper bracket 1. Among them, the position of the first compression chamber 21 corresponds to the high-pressure chamber 8 at the bottom of the movable scroll 2, and the position of the second compression chamber 22 corresponds to the low-pressure chamber 9 at the bottom of the movable scroll 2. The different back pressures at the bottom of the movable scroll 2 correspond to the corresponding high and low pressures of the compression chambers to achieve force balance on the inner and outer surfaces of the movable scroll 2, thereby reducing the overturning moment of the movable scroll 2 generated by the unbalanced force.

[0051] A hole is opened at the bottom surface of the fixed scroll 4 tooth corresponding to the high-pressure chamber 8, which is connected with the horizontal high-pressure channel on the fixed scroll 4, and then connected downwardly to the high-pressure hole of the fixed scroll 4 and the high-pressure hole of the movable scroll 2, and enters the high-pressure chamber 8 on the bottom surface of the movable scroll 2 to form a high back pressure; a hole is opened at the bottom surface of the fixed scroll 4 tooth corresponding to the low-pressure chamber 9, which is connected with the horizontal low-pressure channel on the fixed scroll 4, and then connected downwardly to the low-pressure hole of the fixed scroll 4 and the low-pressure hole of the movable scroll 2, and enters the low-pressure chamber 9 on the bottom surface of the movable scroll 2 to form a low back pressure.

[0052] It is easy for those skilled in the art to understand that the above-mentioned implementation modes can be freely combined and superimposed without conflict.

[0053] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A pump assembly comprising a compression chamber and a back pressure chamber connected via an air guide channel (23), It is characterized in that The compression chamber at least comprises a first compression chamber (21) and a second compression chamber (22), the gas pressure of the first compression chamber (21) being greater than the gas pressure of the second compression chamber (22); The pump assembly further comprises a partition disposed in the back pressure chamber, wherein the partition divides the back pressure chamber into at least two low pressure chambers (9) and a high pressure chamber (8) with different air pressures; The first compression chamber (21) corresponds to and is in communication with the high-pressure chamber (8), and the second compression chamber (22) corresponds to and is in communication with the low-pressure chamber (9); The pump body assembly comprises a movable scroll (2) and an upper bracket (1), wherein the movable scroll (2) and the upper bracket (1) enclose the back pressure chamber; both sides of the partition are sealed against the movable scroll (2) and the upper bracket (1), and a portion of the outer wall of the partition is in sealing contact with the inner wall of the back pressure chamber, thereby forming a partition for the back pressure chamber; The separator comprises a cross slip ring (3), and the cross slip ring (3) comprises a ring body; the low-pressure chamber (9) and the high-pressure chamber (8) are both located outside the ring body; A groove is provided on one side of the upper bracket (1) close to the movable scroll (2), and the movable scroll (2) and the cross ring (3) are overlappedly arranged in the groove; a key groove (11) is provided on the side wall of the groove, and the cross ring (3) also includes a sliding key (31), and the sliding key (31) is sealed in the key groove (11), and the low-pressure chamber (9) and the high-pressure chamber (8) are respectively arranged on both sides of the sliding key (31).

2. The pump assembly according to claim 1, It is characterized in that The pump body assembly further comprises a fixed scroll (4), wherein the fixed scroll (4) and the movable scroll (2) enclose the first compression chamber (21) and the second compression chamber (22).

3. The pump assembly according to claim 1, It is characterized in that The side wall of the sliding key (31) and the side wall of the keyway (11) are arranged to be in sealed sliding fit.

4. The pump assembly according to claim 1, It is characterized in that The air guiding channels are provided with at least two, the first compression chamber (21) is connected to the high-pressure chamber (8) via a part of the air guiding channels, and the second compression chamber (22) is connected to the low-pressure chamber (9) via another part of the air guiding channels.

5. The pump assembly according to claim 2, It is characterized in that One section of the air guide passage is arranged in the fixed scroll plate (4), and the other section is arranged in the upper bracket (1).

6. A scroll compressor, It is characterized in that The invention comprises a pump body assembly as described in any one of claims 1 to 5.

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