Scroll compressor and air conditioner

Abstract

The invention provides a scroll compressor and an air conditioner, and belongs to the technical field of air conditioning, the scroll compressor comprises a movable scroll plate, a static scroll plate, a crankshaft used for driving the movable scroll plate to translate relative to the static scroll plate and an upper support used for supporting the crankshaft, and the back face of a plate body of the movable scroll plate is provided with a movable plate bearing seat; a first ring groove is formed in the end face of the side, facing the movable vortex plate, of the upper support, a first back pressure cavity is formed between the first ring groove and the movable disc bearing seat, a second back pressure cavity is formed between the crankshaft and the movable disc bearing seat, a movable disc bearing is arranged in the second back pressure cavity, and the first end of the crankshaft is rotatably connected into the movable disc bearing seat through the movable disc bearing. The first backpressure cavity and the second backpressure cavity are arranged independently, an oil pumping channel and an oil return channel are formed in the crankshaft, and lubricating oil in the compressor oil pool can be pumped into the first backpressure cavity through the oil pumping channel and flows back into the compressor oil pool through the oil return channel. Oil stirring loss is not generated any more, power consumption of the compressor is reduced, and efficiency improvement of the compressor is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioning, and in particular relates to a scroll compressor and an air conditioner. Background Art

[0002] Scroll compressors are widely used in air conditioning systems due to their high efficiency, small size and smooth operation. Scroll compressors consist of a casing, a movable scroll, a fixed scroll, an upper bracket, a crankshaft, an anti-rotation slip ring, a balance block, a motor and an oil supply structure. Due to the different pressures in the shell, it is divided into a high-pressure chamber and a low-pressure chamber structure. The high-pressure chamber structure has an exhaust pressure in the shell, and the low-pressure chamber structure has an intake pressure in the shell. The common pump body sealing form in the high-pressure chamber structure is a movable disk floating structure, which has the characteristics of axial flexibility, which is beneficial for the compressor to improve its ability to adapt to abnormal operation.

[0003] A high-pressure chamber scroll compressor generally has a back-pressure chamber structure on the back of the moving disc. The conventional back-pressure chamber is divided into a high-pressure oil pool in the middle and an external medium-pressure space by a seal. This causes the moving disc bearing seat to be inside the high-pressure oil pool. Under high-speed operation, the oil stirring loss is serious, the power consumption of the compressor increases, and it is not conducive to improving the efficiency of the compressor. Summary of the invention

[0004] Therefore, the present invention provides a scroll compressor and air conditioner, which can overcome the technical problems in the related art that the high-pressure back pressure chamber of the scroll compressor is filled with lubricating oil, the moving plate bearing seat suffers from serious oil stirring losses during operation, the power consumption of the compressor is increased, and it is not conducive to improving the efficiency of the compressor.

[0005] In order to solve the above problems, the present invention provides a scroll compressor, comprising a movable scroll, a fixed scroll, a crankshaft for driving the movable scroll to translate relative to the fixed scroll, and an upper bracket for supporting the crankshaft, the movable scroll having a movable disk bearing seat on the back side of the disk body, the upper bracket having a first annular groove formed on one end face of the movable scroll, and a first back-pressure chamber formed between the first annular groove and the movable disk bearing seat, a second back-pressure chamber formed between the crankshaft and the movable disk bearing seat, a movable disk bearing being arranged in the second back-pressure chamber, a first end of the crankshaft being rotatably connected to the movable disk bearing seat via the movable disk bearing, the first back-pressure chamber and the second back-pressure chamber being independently arranged, an oil pumping passage and an oil return passage being formed in the crankshaft, the lubricating oil in the compressor oil pool being able to be pumped into the second back-pressure chamber by the oil pumping passage and flow back to the compressor oil pool via the oil return passage.

[0006] In some embodiments, a first sealing ring is disposed between an opening of the movable plate bearing seat facing the upper bracket and the crankshaft, and the first sealing ring is located on a side of the movable plate bearing close to the upper bracket.

[0007] In some embodiments, a snap ring is further provided between the opening of the upper bracket and the crankshaft, and the snap ring is located on a side of the first sealing ring close to the upper bracket.

[0008] In some embodiments, the movable plate bearing is a sliding bearing, and a gap oil film seal is formed between the shaft section of the movable plate bearing close to the upper bracket and the movable plate bearing seat, and between the shaft section of the movable plate bearing close to the upper bracket and the crankshaft.

[0009] In some embodiments, an oil gap is formed between the end surface of the first end and the bottom wall of the movable plate bearing seat, the inlet of the return oil passage is located on the end surface of the first end, and a radial oil outlet hole connected to the pump oil passage is constructed on the crankshaft, and the pump oil passage is connected to the second back pressure chamber via the radial oil outlet hole.

[0010] In some embodiments, an oil groove is provided on the outer peripheral wall of the crankshaft, the oil groove extends along the axial direction of the crankshaft and the groove outlet of the oil groove is located on the end surface of the first end, and the groove inlet of the oil groove is the radial oil outlet hole.

[0011] In some embodiments, a main bearing chamber is also formed on the upper bracket, and the crankshaft is rotatably supported in the main bearing chamber through a main bearing. A second sealing ring is provided in a hole on one side of the main bearing chamber close to the movable scroll, and the second sealing ring is mounted between the crankshaft and the inner wall of the hole of the main bearing chamber.

[0012] In some embodiments, the oil return passage is in communication with the main bearing chamber.

[0013] In some embodiments, the inner cavity of the casing of the scroll compressor is a high-pressure cavity, and a back-pressure drainage channel connected to the inner cavity of the casing is also formed on the upper bracket, and the back-pressure drainage channel is connected to the first back-pressure cavity; and / or a second annular groove is formed on the end surface of the upper bracket facing the movable scroll, a third sealing ring is provided in the second annular groove, and the third sealing ring is clamped between the movable scroll and the upper bracket to form a third back-pressure cavity on the radial outside of the third sealing ring, the third back-pressure cavity is located between the upper bracket and the movable scroll and the third back-pressure cavity is connected to the compression cavity, and the compression cavity is formed by the movable scroll and the static scroll.

[0014] The present invention also provides an air conditioner, comprising the scroll compressor.

[0015] The scroll compressor and air conditioner provided by the present invention have the following beneficial effects: During the rotation of the crankshaft, the lubricating oil in the compressor oil pool below is pumped into the second back pressure chamber through the pump oil passage to fully lubricate the movable plate bearing in the second back pressure chamber, and then flows back to the compressor oil pool. Since the first back pressure chamber and the second back pressure chamber are independently arranged, the lubricating oil entering the second back pressure chamber no longer flows into the first back pressure chamber. In this way, when the crankshaft drives the movable scroll to move, the movable plate bearing seat no longer bears the resistance force of the lubricating oil originally in the first back pressure chamber during the process of following the movement of the movable scroll, and no oil stirring loss is generated, thereby reducing the power consumption of the compressor and improving the efficiency of the compressor. The lubricating oil pumped in the vertical direction in the oil pump oil channel is converted into a roughly horizontal direction through the radial oil outlet hole, so that the lubricating oil can be specifically delivered to the movable plate bearing to ensure reliable lubrication of the movable plate bearing. At the same time, the inlet of the return oil channel is connected to the oil gap at the first end face, and the aforementioned first end is also the top of the crankshaft, so that the lubricating oil in the second back pressure chamber can further ensure the lubrication effect of the movable plate bearing; By constructing an oil groove on the outer circumferential wall of the first end of the crankshaft, and the oil groove is connected with the aforementioned oil gap, it can be ensured that the lubricating oil flowing out of the radial oil outlet hole is more smoothly introduced into the second back pressure chamber and guided to the oil gap in the upper area, and the movable plate bearing can be lubricated more comprehensively in the oil gap. More importantly, guiding the lubricating oil to the oil gap can also effectively prevent the lubricating oil from entering the first back pressure chamber through the intersection between the first back pressure chamber and the second back pressure chamber. By arranging a second sealing ring between the main bearing chamber and the crankshaft, the probability of lubricating oil being present in the first back pressure chamber is further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0017] Figure 1 : is a schematic diagram of the internal structure of a scroll compressor in an embodiment of the present invention (some components are not shown, such as the cross ring between the movable scroll and the upper bracket); Figure 2 yes Figure 1 A partial enlarged view of the middle A; Figure 3 yes Figure 2 A partial enlarged view of point B in the middle; Figure 4 It is a schematic diagram of the partial structure of a scroll compressor in another embodiment of the present invention.

[0018] The accompanying drawings are marked as follows: 11. Orbital scroll; 12. Stationary scroll; 121. Orbital disk bearing seat; 1211. First sealing ring; 1212. Snap ring; 1213. Oil clearance; 2. Crankshaft; 21. Pump oil passage; 22. Oil return passage; 23. Radial oil outlet hole; 24. Oil passage groove; 25. Oil pump; 3. Upper bracket; 31. First annular groove; 32. Back pressure drainage passage; 33. Second annular groove; 34. Third sealing ring; 35. Main bearing chamber; 36. Oil return pipe; 4. Orbital disk bearing; 5. Main bearing; 51. Second sealing ring; 61. Upper cover; 611. Intake pipe; 62. Shell; 621. Exhaust pipe; 63. Lower cover; 71. Motor stator; 72. Motor rotor; 81. Thrust plate; 82. Main balance block; 83. Auxiliary balance block; 91. Lower bracket; 92. Auxiliary bearing; 100, first back pressure chamber; 200, second back pressure chamber; 300, third back pressure chamber; Pd, exhaust pressure; Pm, intermediate pressure. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0021] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90° or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0022] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0023] See also Figures 1 to 4 As shown, according to an embodiment of the present invention, a scroll compressor is provided, including a compressor casing, wherein the compressor casing includes an upper cover 61, a lower cover 63, and a shell barrel 62 connected between the upper cover 61 and the lower cover 63. It can be understood that the casing inner cavity of the compressor casing forms a accommodating space for various components of the compressor, the upper cover 61 is provided with an intake pipe 611, and the shell barrel 62 is provided with an exhaust pipe 621. For details, see Figure 1 As shown, a movable scroll 11, a fixed scroll 12, a crankshaft 2 for driving the movable scroll 11 to translate relative to the fixed scroll 12, and an upper bracket 3 for supporting the crankshaft 2 are arranged in the inner cavity of the casing. The fixed scroll 12 is constructed with an air intake port (not marked in the figure) and an air exhaust port (not marked in the figure). The air intake pipe 611 passes through the upper cover 61 and is connected to the air intake port, and the air exhaust port is exposed to the inner cavity of the casing, so that the inner cavity of the casing objectively forms a high-pressure chamber. At the same time, it can be understood that the exhaust pipe 621 passes through the wall of the shell tube 62 to form a connection with the inner cavity of the casing. A motor rotor 72 is also sleeved on the crankshaft 2, and a motor stator 71 for passing current to drive the motor rotor 72 to rotate is arranged on the outer side of the motor rotor 72. The back of the disk body of the movable scroll 11 has a movable disk bearing seat 121, and the upper bracket 3 faces one side end face of the movable scroll 11 (that is, Figure 1A first annular groove 31 is formed on the top side end surface in the orientation shown, and a first back-pressure chamber 100 is formed between the first annular groove 31 and the movable disk bearing seat 121. Objectively, the movable disk bearing seat 121 is located in the first back-pressure chamber 100, and the formation of the first back-pressure chamber 100 is also assisted by the outer peripheral wall of the crankshaft 2. A second back-pressure chamber 200 is formed between the crankshaft 2 and the movable disk bearing seat 121. The first back-pressure chamber 100 and the second back-pressure chamber 200 both utilize the pressure fluid (exhaust refrigerant or lubricating oil) therein to form an axial flexible force on the back side of the movable scroll 11 to ensure the sealing of the compression chamber formed by the movable scroll 11 and the fixed scroll 12. A movable disk bearing 4 is provided in the second back-pressure chamber 200. The first end of the crankshaft 2 (i.e. Figure 1 The top of the position shown in the figure) is rotatably connected to the movable plate bearing seat 121 via the movable plate bearing 4, the first back pressure chamber 100 and the second back pressure chamber 200 are independently arranged, and a pump oil passage 21 and a return oil passage 22 are formed in the crankshaft 2, and the lubricating oil in the compressor oil pool can be pumped into the second back pressure chamber 200 by the pump oil passage 21 and returned to the compressor oil pool via the return oil passage 22, and further see Figure 1 As shown, the second end of the crankshaft 2 (i.e. Figure 1 The bottom end of the crankshaft 2 (shown in the figure) is rotatably supported on the lower bracket 91 via an auxiliary bearing 92, thereby ensuring the smooth and reliable rotation of the crankshaft 2. An oil pump 25 is provided at the second end of the crankshaft 2. During the rotation of the crankshaft 2, the oil pump 25 pumps the lubricating oil in the compressor oil pool below into the pump oil channel 21 and passes through the second back pressure chamber 200. After fully lubricating the movable plate bearing 4, the oil returns to the compressor oil pool via the pump oil channel 21, forming a lubrication cycle for the movable plate bearing 4. It should be noted that the aforementioned first back pressure chamber 100 and the second back pressure chamber 200 are independently arranged, which means that the pressure fluids contained in each of the two back pressure chambers do not circulate with each other. For example, the exhaust gas flow (refrigerant) in the first back pressure chamber 100 and the high-pressure lubricating oil (which may contain part of the refrigerant) in the second back pressure chamber 200 do not flow into each other or the amount of flow is extremely small and can be ignored.

[0024] In this technical solution, during the rotation of the crankshaft 2, the lubricating oil in the compressor oil pool below is pumped into the second back pressure chamber 200 through the pump oil passage 21, and then fully lubricated to the movable disc bearing 4 in the second back pressure chamber 200, and then returned to the compressor oil pool. Since the first back pressure chamber 100 and the second back pressure chamber 200 are independently arranged, the lubricating oil entering the second back pressure chamber 200 no longer flows into the first back pressure chamber 100. In this way, when the crankshaft 2 drives the movable scroll 11 to move, the movable disc bearing seat 121 no longer bears the resistance force of the lubricating oil originally in the first back pressure chamber 100 during the movement of the movable scroll 11, and no oil stirring loss is generated, which reduces the power consumption of the compressor and is beneficial to improving the efficiency of the compressor. In addition, the high back pressure of the movable scroll 11 is provided by the aforementioned first back pressure chamber 100 and the second back pressure chamber 200 at the same time, which can ensure that the sealing coefficient meets the requirements under light load conditions and ensure energy efficiency under light load conditions.

[0025] In some embodiments, in combination with Figure 2 and Figure 3 As shown, as a specific implementation method in which the first back pressure chamber 100 and the second back pressure chamber 200 are independently arranged, a first sealing ring 1211 is arranged between the opening of the movable plate bearing seat 121 facing the upper bracket 3 and the crankshaft 2, and the first sealing ring 1211 is located on the side of the movable plate bearing 4 close to the upper bracket 3, that is, the first sealing ring 1211 is clamped between the crankshaft 2 and the inner wall surface of the opening of the movable plate bearing seat 121, thereby achieving a reliable seal between the first back pressure chamber 100 and the second back pressure chamber 200 and preventing the lubricating oil in the second back pressure chamber 200 from entering the first back pressure chamber 100. The first sealing ring 1211 can be specifically made of oil-resistant and temperature-resistant rubber with suitable hardness, and the cross-section of the first sealing ring 1211 can be flexibly selected. In a specific embodiment, the cross-section of the first sealing ring 1211 is U-shaped. It should be noted that, due to the use of the aforementioned first sealing ring 1211, the selection of the structural type of the aforementioned movable plate bearing 4 can be more flexible, and there is no need to consider the sealing effect of the movable plate bearing 4 itself on the lubricating oil. For example, a roller bearing can be used.

[0026] In some embodiments, a retaining ring 1212 is further provided between the opening of the upper bracket 3 and the crankshaft 2. The retaining ring 1212 is located on a side of the first sealing ring 1211 close to the upper bracket 3. The retaining ring 1212 may be, for example, a C-shaped retaining spring.

[0027] In this technical solution, by setting a retaining ring 1212 on the side of the first sealing ring 1211 close to the upper bracket 3, the position of the first sealing ring 1211 can be ensured to be reliable and stable, preventing the first sealing ring 1211 from falling off between the crankshaft 2 and the moving plate bearing seat 121.

[0028] In other embodiments, see Figure 4 As shown, in this embodiment, the movable plate bearing 4 is a sliding bearing, and a clearance oil film seal is formed between the shaft section of the movable plate bearing 4 close to the upper bracket 3 and the movable plate bearing seat 121, as well as between the shaft section of the movable plate bearing 4 close to the upper bracket 3 and the crankshaft 2. That is, in this technical solution, the effective isolation between the first back pressure chamber 100 and the second back pressure chamber 200 is achieved by relying on the matching clearance between the sliding bearing and the crankshaft 2 and the movable plate bearing seat 121 to form a sealing oil film, and the structure is simpler. It can be understood that at this time, a corresponding axial limiting structure for the movable plate bearing 4 should also be formed on the corresponding movable plate bearing seat 121, which is not shown in the figure as a more conventional anti-slip treatment method.

[0029] See Figure 3 As shown, in some embodiments, an oil gap 1213 is formed between the end surface of the first end and the bottom wall of the movable plate bearing seat 121, the inlet of the oil return passage 22 is located on the end surface of the first end, and a radial oil outlet hole 23 connected to the oil pump passage 21 is configured on the crankshaft 2, and the oil pump passage 21 is connected to the second back pressure chamber 200 via the radial oil outlet hole 23. It can be understood that Figure 1 The orientation shown is for reference only. The extension direction of the radial oil outlet hole 23 is approximately in the horizontal plane, while the extension direction of the pump oil passage 21 is approximately in the vertical direction, that is, the two are approximately perpendicular.

[0030] In this technical solution, the lubricating oil pumped in the vertical direction in the oil channel 21 is converted into a roughly horizontal direction through the radial oil outlet hole 23, so that the lubricating oil can be delivered to the movable plate bearing 4 in a targeted manner, ensuring reliable lubrication of the movable plate bearing 4. At the same time, the inlet of the return oil channel 22 is located at the first end face and connected to the oil gap 1213, and the aforementioned first end is also the top end of the crankshaft 2, which can further ensure the lubrication effect of the lubricating oil on the movable plate bearing 4 in the second back pressure chamber 200.

[0031] In some embodiments, see Figure 3 As shown, an oil groove 24 is provided on the outer peripheral wall of the crankshaft 2, and the oil groove 24 extends along the axial direction of the crankshaft 2 and the groove outlet of the oil groove 24 is located on the end surface of the first end, and the groove inlet of the oil groove 24 is the radial oil outlet hole 23.

[0032] In this technical solution, an oil groove 24 is constructed on the outer circumferential wall of the first end of the crankshaft 2, and the oil groove 24 is connected to the aforementioned oil gap 1213, so that the lubricating oil flowing out of the radial oil outlet hole 23 can be more smoothly introduced into the second back pressure chamber and guided to the oil gap 1213 in the upper area, and the movable plate bearing 4 can be more comprehensively lubricated in the oil gap 1213. More importantly, guiding the lubricating oil to the oil gap 1213 can also effectively prevent the lubricating oil from entering the first back pressure chamber 100 via the junction between the first back pressure chamber 100 and the second back pressure chamber 200.

[0033] In some embodiments, a main bearing chamber 35 is further formed on the upper bracket 3, and the crankshaft 2 is rotatably supported in the main bearing chamber 35 through the main bearing 5. A second sealing ring 51 is provided in a hole on one side of the main bearing chamber 35 close to the movable scroll 11. The second sealing ring 51 is sleeved between the crankshaft 2 and the inner wall of the hole of the main bearing chamber 35, and the main bearing 5 is located on the side of the second sealing ring 51 away from the movable scroll 11. The second sealing ring 51 can be of the same type as the aforementioned first sealing ring 1211, which is not described in detail here.

[0034] In this technical solution, by providing a second sealing ring 51 between the main bearing chamber 35 and the crankshaft 2 , the probability of lubricating oil being present in the first back pressure chamber 100 is further reduced.

[0035] In some embodiments, the oil return passage 22 is connected to the main bearing chamber 35, see Figure 3 As mentioned above, the oil return passage 22 extends along the axial direction of the crankshaft 2, and the outlet of the oil return passage 22 is located in the main bearing chamber 35, so that the main bearing 5 can be fully lubricated before returning to the compressor oil pool. Figure 2 As shown, an oil outlet hole penetrating the bottom of the main bearing chamber 35 is also provided on the upper bracket 3, and an oil return pipe 36 is connected to the outlet of the oil outlet hole. The oil return pipe 36 extends from top to bottom to guide the lubricating oil in the main bearing chamber 35 to flow back. Since the lubricating oil is in the oil return pipe 36 during the entire oil return process, it will not be driven by the rotation of the motor rotor 72 below, which is beneficial to reducing the oil discharge rate of the compressor.

[0036] A thrust plate 81 is also provided at the bottom opening of the main bearing chamber 35 to ensure that the main bearing 5 can be reliably and stably located in the main bearing chamber 35 .

[0037] As mentioned above, the inner cavity of the casing of the scroll compressor is a high-pressure cavity, and a back-pressure drainage channel 32 connected to the inner cavity of the casing is also formed on the upper bracket 3, and the back-pressure drainage channel 32 is connected to the first back-pressure cavity 100. The high-pressure refrigerant in the high-pressure cavity can be guided into the first back-pressure cavity 100 through the back-pressure drainage channel 32, thereby realizing the high back pressure (exhaust pressure Pd) function of the first back-pressure cavity 100.

[0038] A second annular groove 33 is formed on the end surface of the upper bracket 3 on the side facing the movable scroll 11, and a third sealing ring 34 is arranged in the second annular groove 33, and the third sealing ring 34 is clamped between the movable scroll 11 and the upper bracket 3 to form a third back pressure chamber 300 on the radial outside of the third sealing ring 34, and the third back pressure chamber 300 is located between the upper bracket 3 and the movable scroll 11 and the third back pressure chamber 300 is connected with a compression chamber (not marked in the figure), and the compression chamber is formed by the movable scroll 11 and the fixed scroll 12, so that the third back pressure chamber 300 realizes the function of medium back pressure (intermediate pressure Pm). It can be understood that the first back pressure chamber 100, the second back pressure chamber 200 and the third back pressure chamber 300 are all roughly annular or circular chambers, and these chambers are basically coaxially arranged with the axis of the crankshaft 2.

[0039] In order to improve the rotational dynamic balancing performance of the crankshaft 2 , a main balancing block 82 is mounted on the crankshaft 2 , and an auxiliary balancing block 83 is arranged on one end face of the motor rotor 72 .

[0040] According to an embodiment of the present invention, there is also provided an air conditioner, comprising the scroll compressor described above.

[0041] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. 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 invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A scroll compressor, comprising a movable scroll (11), a stationary scroll (12), a crankshaft (2) for driving the movable scroll (11) to translate relative to the stationary scroll (12), and an upper bracket (3) for supporting the crankshaft (2), characterized in that: The movable scroll (11) has a movable scroll bearing seat (121) on its back side, the upper bracket (3) has a first annular groove (31) formed on one side end surface facing the movable scroll (11), and a first back pressure cavity (100) is formed between the first annular groove (31) and the movable scroll bearing seat (121), a second back pressure cavity (200) is formed between the crankshaft (2) and the movable scroll bearing seat (121), a movable scroll bearing (4) is provided in the second back pressure cavity (200), and the crankshaft ( The first end of the crankshaft (2) is rotatably connected to the movable plate bearing seat (121) via the movable plate bearing (4), the first back pressure chamber (100) and the second back pressure chamber (200) are independently arranged, and a pump oil passage (21) and an oil return passage (22) are formed in the crankshaft (2), and the lubricating oil in the compressor oil pool can be pumped into the second back pressure chamber (200) by the pump oil passage (21) and returned to the compressor oil pool via the oil return passage (22).

2. The scroll compressor according to claim 1, characterized in that: A first sealing ring (1211) is arranged between an opening of the movable plate bearing seat (121) facing the upper bracket (3) and the crankshaft (2), and the first sealing ring (1211) is located on a side of the movable plate bearing (4) close to the upper bracket (3).

3. The scroll compressor according to claim 2, characterized in that: A snap ring (1212) is also provided between the opening of the upper bracket (3) and the crankshaft (2), and the snap ring (1212) is located on a side of the first sealing ring (1211) close to the upper bracket (3).

4. The scroll compressor according to claim 1, characterized in that: The movable plate bearing (4) is a sliding bearing, and a clearance oil film seal is formed between the shaft section of the movable plate bearing (4) close to the upper bracket (3) and the movable plate bearing seat (121), and between the shaft section of the movable plate bearing (4) close to the upper bracket (3) and the crankshaft (2).

5. The scroll compressor according to claim 1, characterized in that: An oil gap (1213) is formed between the end surface of the first end and the bottom wall of the movable plate bearing seat (121); the inlet of the oil return passage (22) is located on the end surface of the first end; and a radial oil outlet hole (23) connected to the oil pump passage (21) is formed on the crankshaft (2); the oil pump passage (21) is connected to the second back pressure chamber (200) via the radial oil outlet hole (23).

6. The scroll compressor according to claim 5, characterized in that: An oil groove (24) is provided on the outer peripheral wall of the crankshaft (2), the oil groove (24) extending along the axial direction of the crankshaft (2) and the groove outlet of the oil groove (24) being located on the end surface of the first end, and the groove inlet of the oil groove (24) being the radial oil outlet hole (23).

7. The scroll compressor according to claim 1, characterized in that: A main bearing chamber (35) is also formed on the upper bracket (3), and the crankshaft (2) is rotatably supported in the main bearing chamber (35) via a main bearing (5). A second sealing ring (51) is provided in a hole on one side of the main bearing chamber (35) close to the movable scroll (11), and the second sealing ring (51) is sleeved between the crankshaft (2) and the inner wall of the hole of the main bearing chamber (35).

8. The scroll compressor according to claim 7, characterized in that: The oil return passage (22) is in communication with the main bearing chamber (35).

9. The scroll compressor according to claim 1, characterized in that: The inner cavity of the casing of the scroll compressor is a high-pressure cavity, and a back-pressure drainage channel (32) communicating with the inner cavity of the casing is also formed on the upper bracket (3), and the back-pressure drainage channel (32) is communicated with the first back-pressure cavity (100); and / or a second annular groove (33) is formed on the end surface of the upper bracket (3) on the side facing the movable scroll (11), a third sealing ring (34) is provided in the second annular groove (33), and the third sealing ring (34) is clamped between the movable scroll (11) and the upper bracket (3) to form a third back-pressure cavity (300) radially outside the third sealing ring (34), the third back-pressure cavity (300) is located between the upper bracket (3) and the movable scroll (11), and the third back-pressure cavity (300) is communicated with a compression cavity, and the compression cavity is formed by the movable scroll (11) and the fixed scroll (12).

10. An air conditioner, characterized in that: The invention comprises the scroll compressor according to any one of claims 1 to 9.

Images