Pump body assembly, scroll compressor

Abstract

The present invention provides a pump body assembly and a scroll compressor. The pump body assembly includes an upper bracket, a crankshaft, a moving scroll plate, and a stationary scroll plate. The upper bracket is sleeved on the outer periphery of the crankshaft. A central oil passage is formed on the crankshaft, and an oil storage cavity is formed on the upper bracket. The central oil passage can transport the lubricating oil in the oil sump at the bottom of the compressor housing to the oil storage cavity. The pump body assembly further includes an oil pumping assembly. A first oil delivery passage is further formed on the upper bracket. The oil pumping assembly can pump the lubricating oil in the oil storage cavity to the friction position between the moving scroll plate and the stationary scroll plate through the first oil delivery passage. According to the present invention, by separately providing the oil pumping assembly to pump the lubricating oil in the oil storage cavity to the friction position, it is ensured that the friction pairs in the pump body assembly can be fully lubricated, thereby improving the overall performance and system reliability of the compressor, and at the same time reducing the operating noise of the compressor.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressor manufacturing, and particularly relates to a pump body assembly and a scroll compressor. Background Art

[0002] A scroll compressor mainly consists of six major components: a stationary scroll, a moving scroll, an upper bracket, a lower bracket, a cross slide ring, and a crankshaft. To ensure the stable and reliable operation of the compressor, the friction pairs between the components must be effectively lubricated, especially all the friction pairs generated between the stationary and moving scrolls of the compressor. The reasons are as follows: 1. From the perspective of theoretical analysis, the area ratio of the end face friction pair of the moving and stationary scrolls is the largest. The stationary and moving scrolls are subjected to multiple forces such as radial, axial, and tangential gas forces, and rely on the oil film for lubrication and sealing. Therefore, whether the stationary and moving scrolls are effectively lubricated is crucial. 2. From the perspective of the actual dissection of abnormal machines after sales, the problems of abnormal machines are most likely to occur in the stationary and moving scrolls. Most of the abnormalities in the stationary and moving scrolls are manifested as lack of oil, with large-area wear on the end faces and the top and bottom of the teeth, peeling of the phosphating layer on the moving scroll, and in severe cases, the overall thickness of the end face of the moving scroll will be reduced by several hundred microns. Based on the above two points, ensuring good lubrication of the friction pair between the stationary and moving scrolls, the compressor is likely to operate stably and reliably. To effectively lubricate the stationary and moving scrolls, there should be enough refrigerant oil (i.e., lubricating oil) on their end faces and in the formed cavities. However, during the operation of the compressor, the refrigerant enters the cavity of the compressor and is fully mixed with enough lubricating oil, then is discharged from the compressor and enters the multi-connected unit system for refrigeration and heating cycles. The oil-carrying rate increases. Coupled with the long connecting pipe, the lubricating oil cannot flow back into the compressor interior, resulting in lack of oil inside the single compressor. Each friction pair cannot be well lubricated, and the compressor malfunctions, thus the overall performance, noise, and reliability of the system do not meet the requirements.

[0003] The scroll compressor uses an oil pump for oil supply. Driven by the motor, the crankshaft drives the oil pump to rotate and suck oil. The lubricating oil moves upward along the axial through-hole of the crankshaft to the top of the crankshaft. The lubricating oil lubricates the bearing of the moving scroll and enters the back pressure chamber. After the oil pool in the back pressure chamber is filled, the lubricating oil moves in two paths: one path enters the cavity to lubricate the stationary and moving scrolls, and the other path flows back to the sheet metal part along the radial channel provided inside the upper bracket, and then returns to the oil pool at the bottom of the compressor (as shown by the green arrow in the figure). In this way, the cycle is repeated to ensure sufficient oil volume inside the compressor. Figure 1 It is the internal oil circuit diagram of the scroll compressor.

[0004] The compressor is equivalent to the heart of the entire refrigeration system. Whether the compressor is reliable determines the lifespan and performance indicators of the matching system. The oil supply and oil circulation rate of the compressor have become key technical parameters in the industry competition regarding the performance, noise, and reliability of the single unit and system matching. When the compressor operates at high frequencies, increasing the oil volume at the end faces and inside of the moving and static disks while reducing the oil circulation rate of the compressor oil can significantly improve the reliability of the compressor. Phenomenon 1: As the rotational speed of the compressor increases, the relative movement speed between the moving and static disks is relatively fast, and the temperatures at the end faces and inside the cavity are relatively high. More lubricating oil is required for large-area lubrication, and at the same time, a large amount of heat in the compression chamber is carried away, ensuring good lubrication of the friction pair between the moving and static disks and reducing the deformation of the moving and static disks, enabling the compressor to operate stably and reliably. Phenomenon 2: Enough lubricating oil mixes fully with the refrigerant and is discharged outside the compressor body, resulting in the loss of lubricating oil and abnormal wear of the compressor. Secondly, the oil entering the system will affect the heat exchange of the condenser and evaporator, causing a decrease in the overall capacity of the system. Summary of the Invention

[0005] Therefore, the present invention provides a pump body assembly and a scroll compressor, which can overcome the deficiency in the related art that the lubrication between the moving scroll disk and the static scroll disk is insufficient, resulting in the overall performance, noise, and reliability of the compressor not meeting the requirements.

[0006] To solve the above problems, the present invention provides a pump body assembly, including an upper bracket, a crankshaft, a moving scroll disk, and a static scroll disk. The upper bracket is sleeved on the outer periphery of the crankshaft. A central oil passage is formed on the crankshaft. An oil storage cavity is formed on the upper bracket. The central oil passage can transport the lubricating oil in the oil sump at the bottom of the compressor housing to the oil storage cavity. The pump body assembly further includes a pump oil assembly. A first oil delivery passage is also formed on the upper bracket. The pump oil assembly can transport the lubricating oil in the oil storage cavity to the friction position between the moving scroll disk and the static scroll disk via the first oil delivery passage.

[0007] In some embodiments, the pump oil assembly includes a rotary driving member and a piston rod. The rotary driving member is sleeved on the crankshaft and rotates along with the rotation of the crankshaft. The first oil delivery passage includes a first oil passage. One end of the piston rod is inserted into the first oil passage, and the other end of the piston rod is connected to the rotary driving member. The piston rod can be driven by the rotary driving member to reciprocate linearly along the extending direction of the first oil passage when the rotary driving member rotates, so as to suck the lubricating oil in the oil storage cavity into the first oil delivery passage and press the lubricating oil entering the first oil delivery passage into the friction position.

[0008] In some embodiments, the rotary drive member includes a connection disk and a flange on a side of the connection disk facing the upper bracket. In the circumferential direction of the connection disk, the height of the flange varies smoothly between a preset maximum height and a preset minimum height. The rotary drive member is sleeved on the crankshaft through the connection disk, and the other end of the piston rod is connected to a first end face of the flange facing the upper bracket.

[0009] In some embodiments, a chute is formed on the other end of the piston rod, and the first end face is located in the chute.

[0010] In some embodiments, a sliding member is provided between the chute and the flange.

[0011] In some embodiments, an oil drain hole is formed in the connection disk; and / or, a balance weight is provided on the connection disk.

[0012] In some embodiments, the pump body assembly further includes a piston rod fixing bracket, which is fixedly connected to the upper bracket and has a through hole formed thereon. The piston rod passes through the through hole and can move along the axial direction of the through hole; and / or, a sealing ring is sleeved on one end of the piston rod.

[0013] In some embodiments, the first oil delivery channel further includes a second oil passage. One end of the second oil passage is communicated with the first oil passage, and the other end of the second oil passage is communicated with the oil storage cavity. A first one-way valve is provided in the second oil passage to ensure that the lubricating oil in the oil storage cavity enters the first oil delivery channel unidirectionally.

[0014] In some embodiments, the first oil delivery channel further includes a third oil passage. One end of the third oil passage is communicated with the first oil passage, and the other end of the third oil passage is communicated with a second oil delivery channel provided on the stationary scroll disk.

[0015] In some embodiments, a second one-way valve is provided in the third oil passage to ensure that the lubricating oil in the first oil delivery channel enters the second oil delivery channel unidirectionally; and / or, the second oil delivery channel is communicated with a buffer space, and the buffer space is the space between the top of the compressor housing and the stationary scroll disk.

[0016] In some embodiments, a first air flow channel is further formed on the upper bracket, and a gas-liquid separation component is provided in the first air flow channel. The mixed air flow in the buffer space can enter the first air flow channel, and the lubricating oil and the refrigerant air flow are separated under the action of the gas-liquid separation component. The separated air flow is discharged through the exhaust port of the compressor housing.

[0017] In some embodiments, a third oil delivery channel is further configured on the upper bracket, and the lubricating oil separated from the first air flow channel can enter the oil storage cavity through the third oil delivery channel.

[0018] In some embodiments, the gas-liquid separation component includes a filter screen assembly and an air pipe. The filter screen assembly and the air pipe are respectively located upstream and downstream of the flowing direction of the refrigerant gas flow, and the height of the air inlet of the air pipe is higher than the height of the outlet of the first air flow channel.

[0019] The present invention also provides a scroll compressor, including the above-mentioned pump body assembly.

[0020] The pump body assembly and the scroll compressor provided by the present invention ensure that the friction pairs in the pump body assembly can be fully lubricated by separately arranging the pump oil assembly to pump the lubricating oil in the oil storage cavity to the friction position, thereby improving the overall performance and system reliability of the compressor, and at the same time reducing the operating noise of the compressor. Description of the Drawings

[0021] Figure 1 is a schematic perspective view of the pump body assembly according to an embodiment of the present invention;

[0022] Figure 2 is Figure 1 a partial enlarged view of part A in

[0023] Figure 3 is Figure 1 a schematic perspective view of the rotary drive member in

[0024] Figure 4 is a schematic structure diagram of the first one-way valve and the second one-way valve in an embodiment of the present invention;

[0025] Figure 5 is a schematic perspective view of the piston rod in an embodiment of the present invention;

[0026] Figure 6 is a schematic perspective view of the filter screen assembly in an embodiment of the present invention;

[0027] Figure 7 is an internal structure schematic diagram of a scroll compressor in another embodiment of the present invention, and the arrows in the figure show the flow directions of the lubricating oil and the mixed gas flow of the refrigerant and the lubricating oil;

[0028] Figure 8 is Figure 7 a partial enlarged view of part B in

[0029] The reference numerals are shown as:

[0030] 1. Upper bracket; 11. Oil storage cavity; 2. Crankshaft; 21. Central oil passage; 3. Moving scroll plate; 4. Stationary scroll plate; 51. Rotary drive member; 511. Connecting plate; 512. Flange; 513. Sliding member; 514. Oil discharge hole; 515. Balance weight; 52. Piston rod; 521. Chute; 522. Sealing ring groove; 53. Piston rod fixing bracket; 54. Sealing ring; 61. First oil passage; 62. Second oil passage; 63. Third oil passage; 64. Second oil delivery channel; 65. Third oil delivery channel; 71. First check valve; 711. Valve core; 712. Guide rod; 713. Oil outlet hole; 72. Second check valve; 81. Filter screen assembly; 811. Filter screen bracket; 812. Filter screen; 82. Air pipe; 100. Compressor housing; 200. Buffer space; 301. Motor rotor; 302. Motor stator; 303. Lower bracket. Detailed implementation manners

[0031] Referring to Figures 1 to 8 As shown, according to an embodiment of the present invention, a pump body assembly is provided, including an upper bracket 1, a crankshaft 2, a moving scroll plate 3, and a stationary scroll plate 4. The upper bracket 1 is sleeved on the outer periphery of the crankshaft 2. A central oil passage 21 is formed on the crankshaft 2, which can pump the lubricating oil in the oil sump at the bottom of the compressor housing 100 along the axial direction of the crankshaft 2 towards one side of the moving scroll plate 3 and the stationary scroll plate 4. An oil storage cavity 11 is formed on the upper bracket 1. Specifically, the oil storage cavity 11 can be an annular area surrounding the crankshaft 2. The central oil passage 21 can also transport the lubricating oil in the oil sump at the bottom of the compressor housing 100 into the oil storage cavity 11. The pump body assembly further includes an oil pumping assembly. A first oil delivery channel is also formed on the upper bracket 1. The oil pumping assembly can transport the lubricating oil in the oil storage cavity 11 to the friction position between the moving scroll plate 3 and the stationary scroll plate 4 through the first oil delivery channel. The friction position can specifically be, for example, the mating surface where the moving scroll plate 3 and the stationary scroll plate 4 are in relative contact (including the respective scroll teeth and their respective substrates), the contact surface between the moving scroll plate 3 and the upper bracket 1, or the wear-resistant layer between the upper bracket 1 and the moving scroll plate 3. In this technical solution, by separately providing the oil pumping assembly, the lubricating oil in the oil storage cavity 11 is pumped to the friction position, thereby ensuring that the friction pairs in the pump body assembly can be fully lubricated, improving the overall performance and system reliability of the compressor, and at the same time reducing the operating noise of the compressor.

[0032] In some embodiments, the oil pumping assembly includes a rotary driving member 51 and a piston rod 52. The rotary driving member 51 is sleeved on the crankshaft 2 and rotates following the rotation of the crankshaft 2. The first oil delivery channel includes a first oil passage 61. One end of the piston rod 52 is inserted into the first oil passage 61, and the other end of the piston rod 52 is connected to the rotary driving member 51. When the rotary driving member 51 rotates, the piston rod 52 can be driven by the rotary driving member 51 to reciprocate linearly along the extending direction of the first oil passage 61, so as to suck the lubricating oil in the oil storage cavity 11 into the first oil delivery channel and press the lubricating oil entering the first oil delivery channel into the friction position. In this technical solution, the sleeving of the rotary driving member 51 and the crankshaft 2 (specifically, for example, interference fit) realizes the utilization of the rotation of the crankshaft 2, and further drives the reciprocating motion of the piston rod 52, making the structure of the oil pumping assembly more concise.

[0033] As a specific implementation manner of the rotary driving member 51, the rotary driving member 51 includes a connecting disk 511 and a flange 512 on the side of the connecting disk 511 facing the upper bracket 1. In the circumferential direction of the connecting disk 511, the height of the flange 512 changes smoothly between a preset maximum height and a preset minimum height. The rotary driving member 51 is sleeved on the crankshaft 2 through the connecting disk 511, and the other end of the piston rod 52 is connected to the first end face of the flange 512 facing the upper bracket 1. Specifically combined with Figure 3 As shown, the flange 512 protrudes toward the side of the upper bracket 1 along the outer peripheral edge of the connecting disk 511, and the protruding height can be reasonably selected according to the sliding fit length between the piston rod 52 and the first oil passage 61. A chute 521 is formed on the other end of the piston rod 52, and the first end face is located in the chute 521, so as to ensure the relative stability and reliability of the positions of the piston rod 52 and the flange 512 during the oil pumping process. A sliding member 513 is arranged between the chute 521 and the flange 512. The sliding member 513 can be, for example, a roller (such as a ball) clamped between the two, or a roller integrally formed with one of them, such as the inner wall of the chute 521, to ensure the smooth sliding of the piston rod 52 on the flange 512. A sealing ring groove 522 is formed on one end of the piston rod 52, and a sealing ring 54 is sleeved therein to ensure the sealing performance of the fit between the piston rod 52 and the first oil passage 61 and improve the oil pumping efficiency of the oil pumping assembly.

[0034] In some embodiments, oil drain holes 514 are formed on the connecting disk 511 to ensure that the lubricating oil thereon can fall back to the bottom oil sump in a more timely manner; a balance weight 515 is provided on the connecting disk 511 to ensure the rotational dynamic balance of the rotary drive member 51. The pump body assembly further includes a piston rod fixing bracket 53, which is fixedly connected to the upper bracket 1 and is formed with a through hole. The piston rod 52 passes through the through hole and can move along the axial direction of the through hole. When the pump body assembly is assembled in the compressor housing 100, the piston rod fixing bracket 53 can also be fixedly connected to the compressor housing 100 at the same time to further ensure the stable and reliable position of the piston rod 52.

[0035] In some embodiments, the first oil delivery channel further includes a second oil passage 62. One end of the second oil passage 62 communicates with the first oil passage 61, and the other end of the second oil passage 62 communicates with the oil storage chamber 11. A first one-way valve 71 is provided in the second oil passage 62 to ensure that the lubricating oil in the oil storage chamber 11 enters the first oil delivery channel unidirectionally. In this technical solution, the design of the first one-way valve 71 can ensure that the lubricating oil entering the first oil passage 61 cannot flow back into the oil storage chamber 11 in the reverse direction. In this way, when the compressor is restarted after being shut down for a period of time, a part of the lubricating oil accumulated in the first oil passage 61 is pressed by the piston rod 52 to the friction position for lubrication, making up for the lag in oil supply from the bottom oil sump of the compressor.

[0036] In some embodiments, the first oil delivery channel further includes a third oil passage 63. One end of the third oil passage 63 communicates with the first oil passage 61, and the other end of the third oil passage 63 communicates with a second oil delivery channel 64 provided on the stationary scroll disk 4. A second one-way valve 72 is provided in the third oil passage 63 to ensure that the lubricating oil in the first oil delivery channel enters the second oil delivery channel 64 unidirectionally; the second oil delivery channel 64 communicates with a buffer space 200, and the buffer space 200 is the space between the top of the compressor housing 100 and the stationary scroll disk 4. The second one-way valve 72 can prevent the phenomenon of insufficient lubrication caused by the backflow of the lubricating oil at the friction position under the action of gravity. The first one-way valve 71 and the second one-way valve 72 can be commercially available components. For example, in terms of the specific structure, it can refer to Figure 4 as shown, including a guide rod 712 that can be in clearance fit with the corresponding oil passage (specifically, the second oil passage 62 and the third oil passage 63), a valve core 711 sleeved on the guide rod 712, and a plurality of oil outlet holes 713 on the valve core 711.

[0037] A first air flow channel is further constructed on the upper support 1. A gas-liquid separation component is arranged in the first air flow channel. The mixed air flow in the buffer space 200 can enter the first air flow channel, and under the action of the gas-liquid separation component, the lubricating oil is separated from the refrigerant air flow. The separated air flow is discharged through the exhaust port of the compressor housing 100. In this technical solution, by arranging the gas-liquid separation component in the compressor housing 100, the lubricating oil in the mixed air flow can be separated once, retained inside the compressor, ensuring sufficient lubricating oil in the compressor, reducing the amount of lubricating oil entering the external system, and thus improving the performance of the external system (such as an air-conditioning system). A third oil delivery channel 65 is further constructed on the upper support 1. The lubricating oil separated in the first air flow channel can enter the oil storage cavity 11 through the third oil delivery channel 65.

[0038] In some embodiments, the gas-liquid separation component includes a filter screen assembly 81 and an air pipe 82. The filter screen assembly 81 and the air pipe 82 are respectively located upstream and downstream of the flowing direction of the refrigerant air flow. The height of the air inlet of the air pipe 82 is higher than the height of the outlet of the first air flow channel. The filter screen assembly 81 specifically includes a filter screen support 811 and a filter screen 812 tensioned on the filter screen support 811.

[0039] As is well known, the rotation of the crankshaft 2 is controlled by the motor rotor 301 sleeved thereon.

[0040] The present invention further provides a scroll compressor, including the above-mentioned pump body assembly. Specifically, both ends of the crankshaft 2 in the pump body assembly are respectively supported inside the compressor housing 100 by the upper support 1 and the lower support 303. An electric motor stator 302 is arranged between the outer periphery of the motor rotor 301 and the compressor housing 100 to drive the motor rotor 301 to rotate when powered on.

[0041] It is easily understood by those skilled in the art that, on the premise of no conflict, the above-mentioned advantageous modes can be freely combined and superimposed.

[0042] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, 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 is only the preferred implementation mode of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and variations can be made without departing from the technical principle of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A pump body assembly, comprising an upper bracket (1), a crankshaft (2), a moving scroll plate (3), and a stationary scroll plate (4). The upper bracket (1) is sleeved on the outer periphery of the crankshaft (2). A central oil passage (21) is formed on the crankshaft (2). An oil storage cavity (11) is formed on the upper bracket (1). The central oil passage (21) can transport the lubricating oil in the oil sump at the bottom of the compressor housing (100) to the oil storage cavity (11). Characterized in that, It further includes a pump oil assembly. A first oil delivery passage is further formed on the upper bracket (1). The pump oil assembly can transport the lubricating oil in the oil storage cavity (11) to the friction position between the moving scroll plate (3) and the stationary scroll plate (4) via the first oil delivery passage. The pump oil assembly includes a rotary driving member (51) and a piston rod (52). The rotary driving member (51) is sleeved on the crankshaft (2) and rotates following the rotation of the crankshaft (2). The first oil delivery passage includes a first oil passage (61). One end of the piston rod (52) is inserted into the first oil passage (61). The other end of the piston rod (52) is connected to the rotary driving member (51). The piston rod (52) can be driven by the rotary driving member (51) to reciprocate linearly along the extension direction of the first oil passage (61) when the rotary driving member (51) rotates, so as to suck the lubricating oil in the oil storage cavity (11) into the first oil delivery passage and press the lubricating oil entering the first oil delivery passage into the friction position.

2. The pump body assembly according to claim 1, Characterized in that, The rotary driving member (51) includes a connecting disc (511) and a flange (512) on the side of the connecting disc (511) facing the upper bracket (1). In the circumferential direction of the connecting disc (511), the height of the flange (512) varies smoothly between a preset maximum height and a preset minimum height. The rotary driving member (51) is sleeved on the crankshaft (2) through the connecting disc (511). The other end of the piston rod (52) is connected to the first end face of the flange (512) facing the upper bracket (1).

3. The pump body assembly according to claim 2, Characterized in that, A chute (521) is formed on the other end of the piston rod (52). The first end face is located in the chute (521).

4. The pump body assembly according to claim 3, Characterized in that, A sliding member (513) is provided between the chute (521) and the flange (512).

5. The pump body assembly according to claim 2, Characterized in that, An oil discharge hole (514) is formed on the connecting disc (511); and / or a balance weight (515) is provided on the connecting disc (511).

6. The pump body assembly according to claim 1, Characterized in that, It further includes a piston rod fixing bracket (53) which is fixedly connected to the upper bracket (1) and is formed with a through hole. The piston rod (52) passes through the through hole and can move along the axial direction of the through hole; and / or, a sealing ring (54) is sleeved on the one end of the piston rod (52).

7. The pump body assembly according to claim 1, wherein, the first oil delivery channel further includes a second oil passage (62). One end of the second oil passage (62) communicates with the first oil passage (61), and the other end of the second oil passage (62) communicates with the oil storage cavity (11). And a first one-way valve (71) is arranged in the second oil passage (62) to ensure that the lubricating oil in the oil storage cavity (11) enters the first oil delivery channel unidirectionally.

8. The pump body assembly according to claim 7, wherein, the first oil delivery channel further includes a third oil passage (63). One end of the third oil passage (63) communicates with the first oil passage (61), and the other end of the third oil passage (63) communicates with a second oil delivery channel (64) provided on the stationary scroll disk (4).

9. The pump body assembly according to claim 8, wherein, a second one-way valve (72) is arranged in the third oil passage (63) to ensure that the lubricating oil in the first oil delivery channel enters the second oil delivery channel (64) unidirectionally; and / or, the second oil delivery channel (64) communicates with a buffer space (200), and the buffer space (200) is the space between the top of the compressor housing (100) and the stationary scroll disk (4).

10. The pump body assembly according to any one of claims 1 to 9, wherein, a first air flow channel is further formed on the upper bracket (1). An air-liquid separation component is arranged in the first air flow channel. The mixed air flow in the buffer space (200) can enter the first air flow channel, and the lubricating oil and the refrigerant air flow are separated under the action of the air-liquid separation component. The separated air flow is discharged through the exhaust port of the compressor housing (100).

11. The pump body assembly according to claim 10, wherein, a third oil delivery channel (65) is further formed on the upper bracket (1). The lubricating oil separated in the first air flow channel can enter the oil storage cavity (11) through the third oil delivery channel (65).

12. The pump body assembly according to claim 10, wherein, the air-liquid separation component includes a filter screen assembly (81) and an air pipe (82). The filter screen assembly (81) and the air pipe (82) are respectively located upstream and downstream of the flowing direction of the refrigerant air flow, and the height of the air inlet of the air pipe (82) is higher than the height of the outlet of the first air flow channel.

13. A scroll compressor, wherein, it includes the pump body assembly according to any one of claims 1 to 12.

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