Centrifugal oil pump assembly, pump body assembly, compressor

Abstract

The present invention provides a centrifugal oil pump assembly, a pump body assembly, and a compressor. The centrifugal oil pump assembly includes an oil suction pipe, a guide vane, and a flow splitting structure. The guide vane and the flow splitting structure are located inside the oil suction pipe. When the centrifugal oil pump assembly rotates at a speed lower than the first speed, the lubricating oil can flow out through the first oil passage between the oil suction pipe and the flow splitting structure under the action of the guide vane. When the centrifugal oil pump assembly rotates at a speed not lower than the first speed, the flow splitting structure can block the flow of part of the lubricating oil in the first oil passage. According to the present invention, it is possible to reduce the oil pumping volume of the centrifugal oil pump assembly during high-frequency operation of the compressor, make the oil volume retained in the compressor relatively sufficient, ensure sufficient lubrication of the internal components of the compressor, reduce wear of the internal components of the compressor, improve the performance of the compressor, and at the same time reduce the amount of lubricating oil entering the external system, thereby improving the performance of the corresponding system.

Description

Technical Field

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

[0002] Whether a compressor can operate well depends not only on ensuring the good mechanical structure accuracy of the compressor itself, but also on ensuring that each moving part can be well lubricated and cooled. In a compressor, the refrigerant oil (i.e., lubricating oil) plays this role. The role of the refrigerant oil in the compressor system is very important. It can not only lubricate and protect the connecting moving parts in the compressor to avoid wear of the compressor, but also cool the compressor motor to ensure that the temperature of the compressor motor will not be too high and cause damage.

[0003] Currently, the compressors generally adopt differential pressure oil supply or centrifugal pump oil supply. However, both of these two pump oil supply methods have the problem of excessive pump oil volume at high frequencies in actual applications. At this time, even the phenomenon of the compressor running out of oil may occur under high-load and high-frequency conditions. The problem of excessive pump oil volume at high frequencies not only has a certain impact on the performance of the compressor, but also the insufficient oil supply of the compressor will bring a greater negative impact on the reliability performance of the compressor.

[0004] Specifically, when the compressor operates at high frequencies, the oil discharge rate of the compressor is too large, and insufficient oil return in the system (such as an air-conditioning system) will cause oil shortage and wear of the compressor, which will in turn bring some negative impacts on the performance and power consumption of the compressor. Such problems will bring many unfavorable factors to the matching between the compressor and the system, and also bring many difficulties to the matching between the compressor and the system. Summary of the Invention

[0005] Therefore, the present invention provides a centrifugal oil pump assembly, a pump body assembly, and a compressor, which can overcome the deficiency that the pump oil assembly in the compressor in the related art has excessive pump oil volume when the compressor operates at high frequencies, resulting in too little lubricating oil in the compressor, causing oil shortage and wear, and bringing negative impacts on the performance and power consumption of the compressor.

[0006] To solve the above problems, the present invention provides a centrifugal oil pump assembly, including an oil suction pipe, a guide oil sheet, and a flow splitting structure. The guide oil sheet and the flow splitting structure are located in the oil suction pipe. When the centrifugal oil pump assembly rotates at a speed lower than the first speed, the lubricating oil can flow out through the first oil passage between the oil suction pipe and the flow splitting structure under the action of the guide oil sheet. When the centrifugal oil pump assembly rotates at a speed not lower than the first speed, the flow splitting structure can block the flow of part of the lubricating oil in the first oil passage.

[0007] In some embodiments, the flow splitting structure includes a main body, and at least one oil baffle is provided on the main body. At least one of the oil baffles can deflect toward one side of the first oil passage under the action of centrifugal force when the flow splitting structure rotates at a speed not lower than the first speed, and can deflect toward the side of the main body under the action of its own elastic restoring force when the flow splitting structure rotates at a speed lower than the first speed.

[0008] In some embodiments, an oil throwing hole is formed in the main body, and part of the lubricating oil in the first oil passage can flow out of the oil suction pipe through the oil throwing hole.

[0009] In some embodiments, a plurality of first grooves are formed on the end face of the oil outlet of the oil suction pipe. The main body includes arm bodies that can be respectively located in the plurality of first grooves in one-to-one correspondence. There are a plurality of the oil throwing holes, and the plurality of oil throwing holes are respectively located in the plurality of arm bodies in one-to-one correspondence.

[0010] In some embodiments, the main body has an oil delivery cylinder coaxial with the axis of the oil suction pipe. There are a plurality of the oil baffles, and the plurality of oil baffles are arranged at intervals along the circumferential direction of the oil delivery cylinder. The oil delivery cylinder is communicated with the oil throwing hole.

[0011] In some embodiments, the oil delivery cylinder is a polyhedron, and the plurality of oil baffles are respectively located on each face of the polyhedron; and / or, the end face of the oil outlet of the oil suction pipe is press-fitted into the central oil passage of the crankshaft.

[0012] In some embodiments, one end of the oil baffle close to the oil throwing hole is a fixed end, and the oil baffle is fixedly connected to the main body through the fixed end. The end of the oil baffle far from the oil throwing hole is a free end.

[0013] In some embodiments, the main body has a sleeve and a convex ring sleeved on the oil inlet end of the crankshaft. The oil throwing hole is formed on the sleeve, and the oil outlet of the oil suction pipe is sleeved on the convex ring.

[0014] The present invention also provides a pump body assembly, including the above-mentioned centrifugal oil pump assembly.

[0015] The present invention also provides a compressor, including the above-mentioned pump body assembly.

[0016] A centrifugal oil pump assembly, a pump body assembly, and a compressor provided by the present invention. When the compressor is in a high-frequency operating condition, the flow splitting structure can block part of the lubricating oil in the first oil passage from entering the central oil passage of the crankshaft through the oil outlet, that is, it can reduce the oil pumping volume of the centrifugal oil pump assembly when the compressor is operating at high frequency, making the oil volume retained in the compressor relatively sufficient, ensuring sufficient lubrication of the internal components of the compressor, reducing wear of the internal components of the compressor, improving the performance of the compressor, and at the same time reducing the amount of lubricating oil entering the external system, thereby improving the performance of the corresponding system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an exploded structural schematic diagram of the centrifugal oil pump assembly according to an embodiment of the present invention;

[0018] Figure 2 is Figure 1 a three-dimensional structural schematic diagram of the oil suction pipe in

[0019] Figure 3 is Figure 1 a structural schematic diagram of the flow splitting structure in

[0020] Figure 4 is Figure 1 another structural schematic diagram of the flow splitting structure in

[0021] Figure 5 is Figure 1 yet another structural schematic diagram of the flow splitting structure in

[0022] Figure 6 is an internal structural schematic diagram of the centrifugal oil pump assembly and the crankshaft after being assembled according to an embodiment of the present invention;

[0023] Figure 7 is a simulation schematic diagram of the deformation amount caused by centrifugal force of the flow splitting structure in an embodiment of the present invention at a certain rotational speed.

[0024] The reference numerals are shown as:

[0025] 1. Oil suction pipe; 11. First groove; 12. Oil suction port; 13. Oil outlet; 2. Oil guiding piece; 3. Flow splitting structure; 31. Main body; 311. Sleeve; 312. Convex ring; 32. Oil blocking piece; 33. Oil throwing hole; 34. Arm body; 35. Oil delivery cylinder; 100. Crankshaft; 101. Central oil passage. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Referring to Figures 1 to 7As shown, according to an embodiment of the present invention, a centrifugal oil pump assembly is provided, including an oil suction pipe 1, a oil guiding vane 2, and a flow splitting structure 3. The oil guiding vane 2 and the flow splitting structure 3 are located inside the oil suction pipe 1. The oil suction pipe 1 has an oil suction port 12 corresponding to the oil sump of the compressor and an oil outlet 13 near the crankshaft 100. The oil guiding vane 2 is interference-fitted on the inner wall of the pipe body of the oil suction pipe 1 between the oil suction port 12 and the flow splitting structure 3 so as to be able to pump the lubricating oil in the oil sump from the oil suction port 12 to the oil outlet 13 and finally into the central oil passage 101 inside the crankshaft 100 by means of centrifugal force when the centrifugal oil pump assembly rotates. When the centrifugal oil pump assembly rotates at a speed lower than the first speed, the lubricating oil can flow out through the first oil passage between the oil suction pipe 1 and the flow splitting structure 3 under the action of the oil guiding vane 2. When the centrifugal oil pump assembly rotates at a speed not lower than the first speed, the flow splitting structure 3 can block the flow of part of the lubricating oil in the first oil passage. Generally speaking, the speed lower than the first speed can be understood as the compressor being in a low-frequency operating condition, and the speed not lower than the first speed can be understood as the compressor being in a high-frequency operating condition. In this technical solution, when the compressor is in a high-frequency condition, the flow splitting structure 3 can block part of the lubricating oil in the first oil passage from entering the central oil passage 101 of the crankshaft 100 from the oil outlet 13, that is, it can reduce the oil pumping volume of the centrifugal oil pump assembly when the compressor operates at high frequency, making the oil volume retained in the compressor relatively sufficient, ensuring sufficient lubrication of the internal components of the compressor, reducing wear of the internal components of the compressor and improving the performance of the compressor, while also reducing the amount of lubricating oil entering the external system (such as the air-conditioning system) and improving the performance of the corresponding system.

[0027] As a specific implementation manner, the flow splitting structure 3 includes a main body 31, and at least one oil baffle 32 is provided on the main body 31. At least one of the oil baffles 32 can deflect toward one side of the first oil passage under the action of centrifugal force when the flow splitting structure 3 rotates at a speed lower than the first speed, and deflect toward one side of the main body 31 under the action of its own elastic restoring force when the flow splitting structure 3 rotates at a speed lower than the first speed. The thickness of the oil baffle 32 can be reasonably selected according to the rotation speed of the specific flow splitting structure 3. Specifically, it can be determined by considering the amount of deflection deformation under different centrifugal forces. In a specific implementation manner, its thickness can be 0.5 mm. It can be understood that the deformation amount of the oil baffle 32 in this technical solution changes according to the magnitude of the centrifugal force it receives. When its rotation speed is below a certain speed, such as the first speed, the centrifugal force borne by the oil baffle 32 is not sufficient to overcome its own elastic force. At this time, the oil baffle 32 does not deform and does not occupy the flow area of the first oil passage on its outer side. At this time, the oil pumping volume completely depends on the oil guiding and pumping ability of the oil guiding vane 2. When the rotation speed of the flow splitting structure 3 is higher than a certain speed, such as the first speed, the oil baffle 32 deflects and deforms toward one side of the first oil passage under the action of the centrifugal force it receives, thereby obstructing the lubricating oil in the first oil passage. The higher the rotation speed, the larger the obstructed flow area will be, so as to reduce the oil pumping volume of the centrifugal oil pump assembly under the high-frequency operation condition of the compressor. At the same time, the more lubricating oil is intercepted. Using this structure, the control of the oil pumping volume can be achieved only by using the physical properties of the material, and the structure is particularly simple and compact.

[0028] In some implementation manners, an oil throwing hole 33 is formed on the main body 31, and part of the lubricating oil in the first oil passage can flow out of the oil suction pipe 1 through the oil throwing hole 33, so as to throw the part of the lubricating oil blocked by the oil baffle 32 out of the first oil passage through the oil throwing hole 33 and back to the bottom oil pool.

[0029] In some embodiments, a plurality of first grooves 11 are formed on the end surface of the oil outlet 13 of the oil suction pipe 1, which extend along the axial direction of the oil suction pipe 1 to a certain depth. The main body 31 includes arm bodies 34 that can be respectively located in the plurality of first grooves 11 in a one-to-one correspondence, that is, the bottom of the first groove 11 can position the arm bodies 34. There are a plurality of oil throwing holes 33, and the plurality of oil throwing holes 33 are respectively located in the plurality of arm bodies 34 in a one-to-one correspondence. In this technical solution, the main body 31 is integrally connected to the oil suction pipe 1 through the arm bodies 34. Preferably, an interference fit is provided between the first groove 11 and the arm body 34. At this time, the end surface of the oil outlet 13 of the oil suction pipe 1 is inserted into the central oil passage 101 of the crankshaft 100 by interference fit, realizing the convenient assembly connection between the centrifugal oil pump assembly and the crankshaft 100. It can be understood that the dimensions of the arm body 34 are adapted to those of the first groove 11, and the width of the first groove 11 can be, for example, 3 mm.

[0030] The main body 31 has an oil delivery cylinder 35 coaxial with the axis of the oil suction pipe 1. There are a plurality of oil baffle plates 32, and the plurality of oil baffle plates 32 are arranged at intervals along the circumferential direction of the oil delivery cylinder 35. The oil delivery cylinder 35 is communicated with the oil throwing holes 33. The plurality of oil baffle plates 32 arranged at intervals along the circumferential direction can evenly block the lubricating oil in the first oil passage in the circumferential direction when the centrifugal oil pump assembly rotates. In some embodiments, the oil delivery cylinder 35 is a polyhedron, and the plurality of oil baffle plates 32 are respectively located on each surface of the polyhedron.

[0031] One end of the oil baffle plate 32 close to the oil throwing hole 33 is a fixed end, and the oil baffle plate 32 is fixedly connected to the main body 31 through the fixed end. One end of the oil baffle plate 32 far from the oil throwing hole 33 is a free end. Under the action of centrifugal force, the free end deflects the side far from the main body 31 towards the first oil passage side.

[0032] In some other embodiments, for example Figure 5 As shown, the main body 31 has a sleeve 311 sleeved on the oil inlet end of the crankshaft 100 and a convex ring 312. The oil throwing holes 33 are formed on the sleeve 311, and the oil outlet 13 of the oil suction pipe 1 is sleeved on the convex ring 312. Specifically, the sleeve 311 is inserted into the central oil passage 101 of the crankshaft 100 by interference fit, realizing the convenient assembly connection between the centrifugal oil pump assembly and the crankshaft 100. The convex ring 312 is inserted into the oil suction pipe 1 without the first groove 11 by interference fit. The main body 31 has an oil delivery cylinder 35 coaxial with the axis of the oil suction pipe 1. There are a plurality of oil baffle plates 32, and the plurality of oil baffle plates 32 are arranged at intervals along the circumferential direction of the oil delivery cylinder 35. The oil delivery cylinder 35 is communicated with the oil throwing holes 33.

[0033] In summary, the main function of the flow splitting structure 3 in the present invention is to separate and throw out part of the lubricating oil in the oil suction pipe 1, reducing the oil supply to the oil pump at high frequencies. When driven by the crankshaft 100, a part of the lubricating oil can be thrown out through the oil throwing holes 33 on the main body 31 and flow back to the bottom oil sump by means of centrifugal force; the lower end of the main body 31 is designed as a polyhedron structure, and each face has a separate oil baffle 32. At low frequencies, this oil baffle 32 does not extend out, and most of the oil suction pipe 1 pumps the gap between the flow splitting structure 3 and the oil suction pipe 1 (i.e., the first oil passage) into the crankshaft 100. At high frequencies, this oil baffle 32 is thrown out by the centrifugal force (as Figure 7 shown), reducing the gap between the flow splitting structure 3 and the oil suction pipe 1, decreasing the flow area, reducing the oil pumping volume, and the higher the frequency, the greater the oil retaining amount of the oil splitting structure and the more the oil thrown back to the oil sump.

[0034] The centrifugal oil pump assembly proposed by the present invention can, by integrating the capabilities of each component, increase the oil pumping volume of the compressor at low frequencies and change and reduce the oil pumping volume of the oil pump through the flow splitting structure 3 at high frequencies, thereby achieving stable lubrication of the compressor, and can also broaden the lowest operating frequency of the compressor downward, which also has a great improvement effect on the matching of the compressor and the system.

[0035] According to an embodiment of the present invention, there is also provided a pump body assembly including the above-mentioned centrifugal oil pump assembly.

[0036] According to an embodiment of the present invention, there is also provided a compressor including the above-mentioned pump body assembly.

[0037] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous ways can be freely combined and superimposed.

[0038] 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 manner of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A centrifugal oil pump assembly, characterized in that, It includes an oil suction pipe (1), an oil guiding sheet (2), and a flow splitting structure (3). The oil guiding sheet (2) and the flow splitting structure (3) are located inside the oil suction pipe (1). When the centrifugal oil pump assembly rotates at a speed lower than the first speed, lubricating oil can flow out through the first oil passage between the oil suction pipe (1) and the flow splitting structure (3) under the action of the oil guiding sheet (2). When the centrifugal oil pump assembly rotates at a speed not lower than the first speed, the flow splitting structure (3) can block the flow of part of the lubricating oil in the first oil passage; the flow splitting structure (3) includes a main body (31), and at least one oil baffle (32) is provided on the main body (31). At least one oil baffle (32) can deflect towards the side of the first oil passage under the action of centrifugal force when the flow splitting structure (3) rotates at a speed not lower than the first speed, and can deflect towards the side of the main body (31) under the action of its own elastic restoring force when the flow splitting structure (3) rotates at a speed lower than the first speed; An oil throwing hole (33) is formed on the main body (31), and part of the lubricating oil in the first oil passage can flow out of the oil suction pipe (1) through the oil throwing hole (33) when the flow splitting structure (3) rotates at a speed not lower than the first speed; a plurality of first grooves (11) are formed on the end face of the oil outlet (13) of the oil suction pipe (1), and the main body (31) includes arm bodies (34) that can be respectively located in the plurality of first grooves (11) in one-to-one correspondence. There are a plurality of oil throwing holes (33), and the plurality of oil throwing holes (33) are respectively located in the plurality of arm bodies (34) in one-to-one correspondence.

2. The centrifugal oil pump assembly according to claim 1, characterized in that, The main body (31) has an oil delivery cylinder body (35) coaxial with the axis of the oil suction pipe (1). There are a plurality of oil baffles (32), and the plurality of oil baffles (32) are arranged at intervals along the circumference of the oil delivery cylinder body (35). The oil delivery cylinder body (35) is communicated with the oil throwing hole (33).

3. The centrifugal oil pump assembly according to claim 2, characterized in that, The oil delivery cylinder body (35) is a polyhedron, and the plurality of oil baffles (32) are respectively located on each face of the polyhedron; and / or, the end face of the oil outlet (13) of the oil suction pipe (1) is press-fitted into the central oil passage (101) of the crankshaft (100).

4. The centrifugal oil pump assembly according to claim 1, characterized in that, One end of the oil baffle (32) close to the oil throwing hole (33) is a fixed end, and the oil baffle (32) is fixedly connected to the main body (31) through the fixed end. The end of the oil baffle (32) far from the oil throwing hole (33) is a free end.

5. A pump body assembly, characterized in that, It includes the centrifugal oil pump assembly according to any one of claims 1 to 4.

6. A compressor, characterized in that, It includes the pump body assembly according to claim 5.

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