Backpressure structure of scroll compressor and scroll compressor

Abstract

The invention belongs to the technical field of scroll compressors, and discloses a back pressure structure of a scroll compressor and the scroll compressor. The back pressure structure comprises a dynamic vortex plate, a static vortex plate and a balance block, a compression cavity is formed between the dynamic vortex plate and the static vortex plate, a back pressure cavity is formed in the side, away from the static vortex plate, of the dynamic vortex plate, the balance block and the dynamic vortex plate are connected through a sliding bearing, and a back pressure hole is formed in the dynamic vortex plate and communicated with the compression cavity; the balance block is provided with a first oil gas channel, the first oil gas channel communicates with the backpressure hole and an assembly gap between the balance block and the sliding bearing, and the first oil gas channel can communicate with the backpressure cavity through the assembly gap. Oil gas can actively and continuously supply oil to the sliding bearing when passing through the assembly gap between the sliding bearing and the balance block, and a kinematic pair formed by the sliding bearing and the balance block is fully lubricated. The scroll compressor has the characteristics of stable operation and long service life.

Description

Technical Field

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

[0002] The movable scroll of the scroll compressor rotates by the rotation of the eccentric crankshaft. The movable scroll 1 and the crankshaft need to be connected by a bearing. The bearings of the movable scroll 1 of most compressors on the market use ball bearings 100. The balls, inner rings and outer rings of the ball bearings 100 can fully contact with the refrigeration oil, so they can be fully lubricated. Figure 1 However, the ball bearing 100 is large in size, high in cost, and has high noise, which limits its application scenarios. In recent years, due to the influence of space and cost, and in order to further improve the quiet performance of the compressor, the bearings of the movable scroll of many compressors have selected sliding bearings 6 with simple structure, small size, low cost, and good quiet performance, as shown in the attached manual. Figure 2 shown.

[0003] However, the sliding bearing needs sufficient lubrication to ensure a good operating state and life. At present, there is no effective solution for the lubrication of the sliding bearings used in compressors to make the sliding bearings fully contact with the lubricating oil. Since there is no effective driving force between the movable scroll sliding bearing and the balance block to allow the lubricating oil to enter the assembly gap between the sliding bearing and the balance block, the two cannot be effectively lubricated. During the high-speed operation of the compressor, it is easy to cause severe wear and failure of the cylindrical part of the sliding bearing and the balance block. Summary of the invention

[0004] The object of the present invention is to provide a back pressure structure of a scroll compressor, which can continuously and actively supply oil to the sliding bearing, so that the moving pair formed by the sliding bearing and the balancing block cylinder is fully lubricated, thereby avoiding the occurrence of compressor failure caused by lack of oil in the sliding bearing.

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

[0006] A back pressure structure of a scroll compressor comprises a movable scroll, a fixed scroll and a balancing block, wherein a compression chamber is formed between the movable scroll and the fixed scroll, and a back pressure chamber is arranged on a side of the movable scroll away from the fixed scroll, the balancing block and the movable scroll are connected via a sliding bearing, a back pressure hole is arranged on the movable scroll, and the back pressure hole is communicated with the compression chamber; a first oil and gas passage is arranged on the balancing block, the first oil and gas passage is communicated with the back pressure hole and an assembly gap between the balancing block and the sliding bearing, and the first oil and gas passage can be communicated with the back pressure chamber via the assembly gap.

[0007] Preferably, a second oil and gas channel is further provided on the balancing block, and the second oil and gas channel connects the back pressure hole and the back pressure chamber; wherein, the first oil and gas channel is connected to the second oil and gas channel, and the first oil and gas channel is connected to the back pressure hole through the second oil and gas channel.

[0008] Preferably, the balancing block comprises: a mounting portion, which is provided with a mounting hole for connecting to an output end of a driving structure; and a counterweight portion, which is arranged on one axial side of the mounting portion, wherein the second oil and gas channel and the first oil and gas channel are both arranged on the mounting portion.

[0009] Preferably, a throttling chamber is provided between the balancing block and the movable scroll, and the throttling chamber is connected to the back pressure hole; the second oil and gas passage and the first oil and gas passage are both connected to the back pressure hole through the throttling chamber.

[0010] Preferably, a groove is provided on a side of the balancing block facing the movable scroll, and the throttling chamber is formed between the groove and the movable scroll.

[0011] Preferably, a first connecting hole is provided on the balancing block, and the first connecting hole connects the throttling chamber and the back pressure chamber to form the second oil and gas channel.

[0012] Preferably, a second connecting hole is further provided on the balancing block, and the second connecting hole is connected with the first connecting hole and the assembly gap to form the first oil and gas channel.

[0013] Preferably, the first connecting hole is extended along the axial direction of the balancing block, and the second connecting hole is extended along a direction perpendicular to the extension direction of the first connecting hole.

[0014] Preferably, the back pressure hole is arranged in the central area of ​​the movable scroll.

[0015] Another object of the present invention is to provide a scroll compressor having the characteristics of stable operation and long service life.

[0016] To achieve this object, the present invention adopts the following technical solutions:

[0017] A scroll compressor comprises the above-mentioned back pressure structure of the scroll compressor.

[0018] Beneficial effects of the present invention:

[0019] The present invention discloses a back pressure structure of a scroll compressor, comprising a movable scroll, a fixed scroll, and a balancing block, wherein a compression chamber is formed between the movable scroll and the fixed scroll, and a back pressure chamber is arranged on the side of the movable scroll away from the fixed scroll, the balancing block and the movable scroll are connected via a sliding bearing, a back pressure hole is arranged on the movable scroll, and the back pressure hole is connected to the compression chamber; a first oil and gas channel is arranged on the balancing block, and the first oil and gas channel is connected to the back pressure hole and the assembly gap between the balancing block and the sliding bearing, and the first oil and gas channel can be connected to the back pressure chamber through the assembly gap. The lubricating oil in the oil-gas mixture gas sucked by the scroll compressor can actively and continuously supply oil to the sliding bearing when passing through the assembly gap between the sliding bearing and the balancing block, so as to fully lubricate the kinematic pair formed by the sliding bearing and the balancing block.

[0020] The scroll compressor provided by the present invention comprises the above-mentioned back pressure structure of the scroll compressor, so that the scroll compressor can run stably and have a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the assembly of a ball bearing and a movable scroll in the prior art;

[0022] Figure 2 It is a schematic diagram of the assembly of a sliding bearing and a movable scroll in the prior art;

[0023] Figure 3 is a structural schematic diagram of a back pressure structure of a scroll compressor in an embodiment of the present invention;

[0024] Figure 4 yes Figure 3 A partial enlarged schematic diagram within the dotted line at B in the middle;

[0025] Figure 5 is a schematic structural diagram of a movable scroll in an embodiment of the present invention;

[0026] Figure 6 1 is a schematic diagram of assembling a movable scroll and a stationary scroll in an embodiment of the present invention;

[0027] Figure 7 is a schematic structural diagram of a balancing block in an embodiment of the present invention;

[0028] Figure 8 yes Figure 7 Schematic diagram of the cross section along AA.

[0029] In the figure:

[0030] 1. Orbital scroll; 11. Back pressure hole; 12. Bearing seat; 2. Stationary scroll; 3. Balance block; 31. Mounting part; 311. Groove; 312. First connecting hole; 313. Second connecting hole; 314. Mounting hole; 32. Counterweight part; 4. Compression chamber; 5. Back pressure chamber; 6. Sliding bearing; 7. Assembly gap; 8. Throttle chamber; 9. Bracket; 10. Wear-resistant plate; 100. Ball bearing. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] During the operation of the scroll compressor, the movable scroll 1 and the fixed scroll 2 are always in a tendency to separate from each other due to the axial gas force of the compression chamber 4, resulting in the continuous increase in the axial clearance between the movable scroll 1 and the fixed scroll 2, and the performance and efficiency of the compressor will continue to decrease. At the same time, the axial gas force causes severe friction between the back of the movable scroll 1 and the parts supporting the movable scroll 1, resulting in increased power consumption and shortened service life of the compressor. In order to balance the axial gas force of the compression chamber 4, a channel is usually established to introduce high-pressure chamber gas into the cavity on the back of the movable scroll 1 to form a back pressure to offset the axial gas force on the front of the movable scroll 1.

[0036] The existing back pressure is generally formed by opening a bypass channel on the rear cover, the static vortex 2 and the bracket 9 to connect the exhaust chamber and the back pressure chamber 5, and a throttle tube is set in the channel. The high-pressure gas enters the back pressure chamber 5 after throttling to form the back pressure. Since the channel passes through multiple parts such as the rear cover, the static vortex 2 and the intermediate body, it needs to be sealed multiple times. This connection method not only increases the risk of internal leakage, but also requires the provision of multiple sealing rings or sealing sheets, and a throttle tube is also required, which increases the cost.

[0037] On the other hand, since there is no effective driving force between the sliding bearing 6 of the movable scroll 1 and the balance block 3 to allow the lubricating oil to continuously enter the assembly gap 7 between the sliding bearing 6 and the balance block 3, the two cannot be effectively lubricated. During the high-speed operation of the compressor, the cylindrical parts of the sliding bearing 6 and the balance block 3 are easily severely worn and fail.

[0038] In order to solve the above problems, the present invention discloses a back pressure structure of a scroll compressor, comprising a movable scroll 1, a fixed scroll 2, and a balancing block 3. A compression chamber 4 is formed between the movable scroll 1 and the fixed scroll 2, and a back pressure chamber 5 is provided on the side of the movable scroll 1 away from the fixed scroll 2. Figure 3 , Figure 5 and Figure 6As shown, the movable scroll 1 is meshed with the fixed scroll 2 and the movable scroll 1 can move relative to the fixed scroll 2. It can be understood that the movement mode of the movable scroll 1 relative to the fixed scroll 2 is a composite movement consisting of translation and rotation. The compression chamber 4 is located between the movable scroll 1 and the fixed scroll 2, and the compression chamber 4 is formed by the mutual meshing of the movable scroll 1 and the fixed scroll 2. The back pressure chamber 5 is arranged on the side of the movable scroll 1 away from the fixed scroll 2, that is, the back side of the movable scroll 1. In some specific embodiments, a bracket 9 is also provided on the back side of the movable scroll 1, and the bracket 9 can support the movable scroll 1 along the axial direction of the movable scroll 1. A wear-resistant sheet 10 is provided between the bracket 9 and the movable scroll 1, and the wear-resistant sheet 10 can prevent the bracket 9 from directly contacting the movable scroll 1 and causing damage, thereby extending the service life of the structure. The back pressure chamber 5 on the back side of the movable disk is formed by the movable scroll 1, the bracket 9 and the wear-resistant sheet 10. The balancing block 3 is arranged in the back pressure chamber 5, and the balancing block 3 and the movable scroll 1 are connected by a sliding bearing 6. In some specific embodiments, a bearing seat 12 is arranged on the back of the movable scroll 1, and the sliding bearing 6 is arranged in the bearing seat 12, so that the sliding bearing 6 can be installed stably and reliably. A back pressure hole 11 is arranged on the movable scroll 1, and the back pressure hole 11 is connected to the compression chamber 4. A first oil and gas channel is arranged on the balancing block 3, and the first oil and gas channel is connected to the back pressure hole 11 and the assembly gap 7 between the balancing block 3 and the sliding bearing 6, and the first oil and gas channel can be connected to the back pressure chamber 5 through the assembly gap 7, so that the oil and gas passing through the assembly gap 7 can lubricate the sliding bearing 6. It can be understood that the gas sucked in and compressed by the scroll compressor contains a small amount of lubricating oil, which is collectively referred to as an oil-gas mixture. By utilizing the pressure difference between the compression chamber 4 and the back pressure chamber 5, the mixture of lubricating oil and high-pressure gas is forced to enter the back pressure chamber 5 through the above-mentioned two oil-gas passages. While forming the back pressure, the lubricating oil in the oil-gas mixture after entering the first oil-gas passage can continuously supply oil to the sliding bearing 6 when passing through the assembly gap 7 between the sliding bearing 6 and the balance block 3, thereby fully lubricating the moving pair formed by the sliding bearing 6 and the balance block 3, thereby avoiding the occurrence of compressor failure caused by lack of oil in the sliding bearing 6.

[0039] In some embodiments, Figure 3 and Figure 4As shown, a throttling chamber 8 is provided between the balancing block 3 and the movable scroll 1, and the throttling chamber 8 is connected to the back pressure hole 11 and is used to reduce and stabilize the pressure of the oil and gas flowing in from the back pressure hole 11; the first oil and gas channel is connected to the back pressure hole 11 through the throttling chamber 8. It can be understood that since the gas pressure of the back pressure chamber 5 needs to be less than the gas pressure of the compression chamber 4, the throttling chamber 8 can effectively reduce and stabilize the gas pressure flowing out of the compression chamber 4. At the same time, when the back pressure hole 11 is a circular hole, the aperture of the back pressure hole 11 should be of appropriate size, which can not only meet the airflow required to establish the back pressure, but also play a role in throttling, so that the high pressure gas in the compression chamber 4 enters the back pressure chamber 5 at a suitable pressure after pressure throttling, so as to meet the normal operation of the compressor. The size of the back pressure hole 11 is set according to the needs of the actual application, and no specific restrictions are made here.

[0040] In some embodiments, Figure 7 and Figure 8 As shown, a groove 311 is provided on one side of the balancing block 3 facing the movable scroll 1, and a throttling chamber 8 is formed between the groove 311 and the movable scroll 1. It can be understood that by providing the groove 311 to form the throttling chamber 8, the assembly gap 7 between the balancing block 3 and the movable scroll 1 can be reduced, so that the structure is compact, the size of the throttling chamber 8 is controllable, and the production and installation of the structure are convenient.

[0041] In some embodiments, a second oil and gas channel is further provided on the balancing block 3, and the second oil and gas channel is connected to the back pressure hole 11 and the back pressure chamber 5; wherein, the second oil and gas channel and the first oil and gas channel are both connected to the back pressure hole 11 through the throttling chamber 8. In some specific embodiments, the first oil and gas channel is connected to the second oil and gas channel, and the first oil and gas channel is connected to the back pressure hole 11 through the second oil and gas channel. In other words, the first oil and gas channel is connected to the second oil and gas channel, and the first oil and gas channel is connected to the throttling chamber 8 through the second oil and gas channel. In other words, it is the second oil and gas channel that is directly connected to the back pressure hole 11 or the throttling chamber 8, and the first oil and gas channel is not directly connected to the back pressure hole 11 or the throttling chamber 8, but is connected to the back pressure hole 11 or the throttling chamber 8 through the second oil and gas channel. It is understandable that since the first oil and gas channel is connected to the assembly gap 7, there may be a slow buildup of back pressure in the back pressure chamber 5 at the initial stage of the operation of the scroll compressor. Therefore, a second oil and gas channel is provided to connect the throttling chamber 8 and the back pressure chamber 5, so as to achieve a rapid buildup of back pressure in the back pressure chamber 5. By connecting the first oil and gas channel with the second oil and gas channel instead of directly connecting with the back pressure hole 11 or the throttling chamber 8, the number and length of channels on the balance block 3 can be reduced, thereby ensuring the overall structural strength of the balance block 3.

[0042] In some specific embodiments, Figure 7 and Figure 8As shown, the balancing block 3 is provided with a first connecting hole 312, which is arranged along the axial direction of the balancing block 3 and connects the throttling chamber 8 and the back pressure chamber 5 to form a second oil and gas passage. It can be understood that one end of the first connecting hole 312 is connected to the throttling chamber 8, and the other end is directly or indirectly connected to the back pressure chamber 5. For example, the first connecting hole 312 can be connected to the back pressure chamber 5 through the installation gap between the balancing block 3 and the crankshaft, and a through hole or a groove body can also be provided on the balancing block 3 to connect the back pressure chamber 5 and the first connecting hole 312.

[0043] In some specific embodiments, Figure 7 and Figure 8 As shown, the balancing block 3 is also provided with a second connecting hole 313, which extends along a position perpendicular to the first connecting hole 312, that is, extends along the radial direction of the balancing block 3, so as to connect the first connecting hole 312 and the assembly gap 7 between the balancing block 3 and the sliding bearing 6 to form a first oil-gas passage. It can be understood that the assembly gap 7 between the balancing block 3 and the sliding bearing 6 is not sealed with the back pressure chamber 5, and the assembly gap 7 between the balancing block 3 and the sliding bearing 6 can be connected with the back pressure chamber 5 through a small gap, and the oil-gas mixture in the first oil-gas passage first passes through the assembly gap 7 between the balancing block 3 and the sliding bearing 6 to realize the continuous supply of lubricating oil to the sliding bearing 6, and then passes into the back pressure chamber 5 through the gap to form back pressure. It should be noted that one end of the assembly gap 7 between the balancing block 3 and the sliding bearing 6 can also be connected with the throttling chamber 8, and under the action of the pressure difference between the throttling chamber 8 and the back pressure chamber 5, the oil-gas mixture is respectively passed into the assembly gap 7 from the throttling chamber 8 and the second connecting hole 313, and at this time, the second connecting hole 313 is arranged between the two ends of the assembly gap 7. In some specific embodiments, the second connection hole 313 can be set at the middle position between the two ends of the assembly gap 7 to prevent the lubricating oil that flows directly from the throttle cavity 8 into the assembly gap 7 from being retained at the end of the sliding bearing 6 close to the throttle cavity 8 and failing to fully lubricate the end of the sliding bearing 6 away from the throttle cavity 8, so as to achieve uniform lubrication of all parts of the sliding bearing 6 and enhance the lubrication effect. It can be understood that since the balancing block 3 rotates at a high speed during the operation of the scroll compressor, the gas flow rate outside the second connection hole 313 is large to form a negative pressure, which can also assist in obtaining the oil-gas mixture from the first connection hole 312.

[0044] In some embodiments, Figure 5 and Figure 6As shown, the back pressure hole 11 is arranged in the central area of ​​the movable scroll 1. It can be understood that the position of the back pressure hole 11 is determined according to the contour of the central correction arc, generally close to the geometric center of the movable scroll 1. The back pressure hole 11 is connected to the high-pressure compression chamber 4 in the central area of ​​the movable scroll 1. Since the central compression chamber 4 is always in a high pressure state, the high-pressure gas in the central compression chamber 4 enters the back pressure chamber 5 after throttling through the back pressure hole 11, and forms back pressure in the back pressure chamber 5. The throttling chamber 8 is arranged corresponding to the back pressure hole 11. In some specific embodiments, the throttling chamber 8 is arranged in the bearing seat 12 of the movable scroll 1, and is surrounded by the balance block 3 and the sliding bearing 6, which can effectively reduce the channel stroke between the compression chamber 4 and the back pressure chamber 5. No other parts are passed in the middle, so there is no need to set additional sealing parts for sealing, which can reduce the risk of leakage. The back pressure hole 11 is directly opened at the bottom of the movable scroll 1. The back pressure hole 11 has the functions of conveying oil and gas and throttling at the same time, eliminating the throttling tube and sealing parts, saving costs.

[0045] In some embodiments, Figure 8 As shown, the balancing block 3 includes a mounting portion 31 and a counterweight portion 32. The mounting portion 31 is provided with a mounting hole 314 for connecting to the output end of the driving structure. The counterweight portion 32 is integrally formed with the mounting portion 31, and is used to balance the centrifugal force of the driving structure. The driving structure that drives the movable scroll 1 to move, that is, the crankshaft, is rotatably arranged in the bracket 9, one end of the crankshaft passes through the bracket 9 and is connected to the driving source, and the other end is connected to the balancing block 3. It can be understood that during the operation of the scroll compressor, the centrifugal force or centrifugal torque generated by the rotation of the eccentric component (crankshaft) will cause the compressor to generate vibration and noise. In order to reduce the vibration and noise of the compressor, a balancing block 3 is usually arranged at the upper end of the driving shaft of the rotating component to provide a reverse centrifugal force or centrifugal torque to balance the imbalance generated by the eccentric component.

[0046] In some embodiments, the first oil and gas channel, the second oil and gas channel and the groove 311 are all arranged on the mounting portion 31, which can not only move with the movable scroll 1 to ensure that each channel is always connected, but also does not require additional structures to connect the throttling chamber 8, thereby shortening the channel stroke.

[0047] The back pressure structure of the scroll compressor of the present invention has a back pressure hole 11 on the bottom surface of the movable scroll 1. One end of the back pressure hole 11 is connected to the high pressure compression chamber 4 in the center of the movable disk, and the other end is connected to the bearing seat 12 on the back of the movable disk. The balance block 3 is divided into two parts, namely the counterweight part 32 and the cylindrical mounting part 31. The end surface of the mounting part 31 has a groove 311, which forms a cavity, namely the throttling chamber 8, together with the movable scroll 1 and the sliding bearing 6. The mounting part 31 is axially provided with a mounting hole 314 and a first connecting hole 312, and the mounting hole 314 is for matching with the crankshaft. One end of the first connection hole 312 is connected to the throttling chamber 8, and the other end is connected to the back pressure chamber 5, forming a second oil and gas passage; the mounting portion 31 is provided with a second connection hole 313 along its radial direction, one end of the second connection hole 313 is connected to the first connection hole 312, and the other end is connected to the assembly gap 7 between the sliding bearing 6 and the mounting portion 31 of the balance block 3, and the assembly gap 7 between the sliding bearing 6 and the mounting portion 31 of the balance block 3 is also connected to the back pressure chamber 5, thereby forming a first oil and gas passage. In other embodiments, the first oil and gas passage can also be directly connected to the throttling chamber 8.

[0048] The back pressure structure of the scroll compressor of the present invention utilizes the pressure difference between the central high-pressure compression chamber 4 of the movable scroll 1 and the back pressure chamber 5 on the back of the movable scroll 1 to force the mixture of lubricating oil and high-pressure gas to enter the back pressure chamber 5 through the above two oil and gas channels to form back pressure. After entering the first oil and gas channel, the oil and gas mixture can continuously supply oil to the kinematic pair formed by the balance block 3 and the sliding bearing 6, so as to achieve the effect of full lubrication. Compared with the previous back pressure structure, firstly, the lubricating oil can continuously supply oil to the sliding bearing 6 when passing through the assembly gap 7 between the sliding bearing 6 and the mounting portion 31 of the balance block 3, so as to fully lubricate the kinematic pair formed by the sliding bearing 6 and the mounting portion 31 of the balance block 3. Secondly, since the back pressure hole 11 directly connects the central high-pressure compression chamber 4 of the movable scroll 1 and the back pressure chamber 5 on the back of the movable scroll 1, the channel shape is short and does not pass through other components in the middle, so no additional sealing parts are required for sealing, which can reduce the risk of leakage. Finally, the back pressure structure of the scroll compressor of the present invention directly opens a back pressure hole 11 at the bottom of the movable scroll 1. The back pressure hole 11 has the functions of conveying oil and gas and throttling, eliminating the throttling tube and sealing parts, and saving costs.

[0049] The present invention also discloses a scroll compressor, comprising the back pressure structure of the scroll compressor as described above, so that the scroll compressor has the characteristics of simple structure, stable operation and long service life.

[0050] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A back pressure structure of a scroll compressor, comprising a movable scroll (1), a stationary scroll (2), and a balancing block (3), wherein: A compression chamber (4) is formed between the movable scroll (1) and the fixed scroll (2), and a back pressure chamber (5) is provided on a side of the movable scroll (1) away from the fixed scroll (2), characterized in that: The balancing block (3) and the movable scroll (1) are connected via a sliding bearing (6); a back pressure hole (11) is provided on the movable scroll (1), and the back pressure hole (11) is communicated with the compression chamber (4); The balancing block (3) is provided with a first oil-gas passage, the first oil-gas passage being connected to the back pressure hole (11) and the assembly gap (7) between the balancing block (3) and the sliding bearing (6), and the first oil-gas passage being able to be connected to the back pressure chamber (5) through the assembly gap (7).

2. The back pressure structure of the scroll compressor according to claim 1, characterized in that: The balancing block (3) is also provided with a second oil and gas passage, the second oil and gas passage being in communication with the back pressure hole (11) and the back pressure chamber (5); The first oil and gas passage is in communication with the second oil and gas passage, and the first oil and gas passage is in communication with the back pressure hole (11) through the second oil and gas passage.

3. The back pressure structure of the scroll compressor according to claim 2, characterized in that: The balancing block (3) comprises: A mounting portion (31), wherein the mounting portion (31) is provided with a mounting hole (314) for connecting to an output end of the driving structure; A counterweight portion (32) is arranged on the peripheral side of the mounting portion (31); Wherein, the second oil and gas passage and the first oil and gas passage are both arranged on the mounting portion (31).

4. The back pressure structure of the scroll compressor according to claim 2, characterized in that: A throttling chamber (8) is provided between the balancing block (3) and the movable scroll (1), and the throttling chamber (8) is communicated with the back pressure hole (11); The second oil and gas passage and the first oil and gas passage are both connected to the back pressure hole (11) through the throttling chamber (8).

5. The back pressure structure of the scroll compressor according to claim 4, characterized in that: A groove (311) is provided on a side of the balancing block (3) facing the movable scroll (1), and the throttling chamber (8) is formed between the groove (311) and the movable scroll (1).

6. The back pressure structure of the scroll compressor according to claim 4, characterized in that: The balancing block (3) is provided with a first connecting hole (312), and the first connecting hole (312) is connected with the throttling chamber (8) and the back pressure chamber (5) to form the second oil and gas passage.

7. The back pressure structure of the scroll compressor according to claim 6, characterized in that: The balancing block (3) is also provided with a second connecting hole (313), and the second connecting hole (313) is connected with the first connecting hole (312) and the assembly gap (7) to form the first oil and gas channel.

8. The back pressure structure of the scroll compressor according to claim 7, characterized in that: The first connection hole (312) is extended along the axial direction of the balancing block (3), and the second connection hole (313) is extended along a direction perpendicular to the extension of the first connection hole (312).

9. The back pressure structure of a scroll compressor according to any one of claims 1 to 8, characterized in that: The back pressure hole (11) is arranged in the central area of ​​the movable scroll (1).

10. A scroll compressor, characterized in that: A back pressure structure comprising a scroll compressor as described in any one of claims 1-9.

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