Pumping device and compressor

Abstract

The application provides a pump oil device and a compressor. The pump oil device comprises a crankshaft, an installation cavity in the crankshaft, and an oil outlet hole in the circumferential side wall of the crankshaft, which is communicated with the installation cavity; a spiral oil pump structure, at least a part of the spiral oil pump structure is located in the installation cavity, the crankshaft can rotate relative to the spiral oil pump structure, and the spiral oil pump structure has an oil discharge channel, and the oil inlet hole of the oil discharge channel is located above the oil outlet hole. The application solves the problem that the frequency adaptation width of the pump oil system of the variable frequency compressor in the prior art is small, and it is difficult to meet the wide frequency pump oil requirement of the variable frequency compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of compressor equipment, in particular to a pump oil device and a compressor. BACKGROUND

[0002] When the piston compressor is running, it needs to supply lubricating oil to each friction pair to reduce the friction loss between each part during operation, and the lubricating oil can also play a certain cooling and heat dissipation effect. At present, a pump oil system is generally arranged in the crankshaft of the compressor to supply oil to each friction pair.

[0003] The variable frequency compressor is a compressor with constant relative speed, and its speed can be continuously adjusted within a certain range to continuously change the output energy. Since the variable frequency compressor can adjust the output power by changing the operating speed according to the working needs, especially when used in refrigeration equipment, the refrigeration capacity can be adjusted by changing the operating speed, and the lower the speed, the smaller the power consumption, so the variable frequency compressor has the advantages of high efficiency and energy saving. At present, the variable frequency compressor is developing towards wide frequency, but too high or too low frequency of the variable frequency compressor will bring challenges to the pump oil system.

[0004] The pump oil system on the crankshaft of the variable frequency piston compressor is mainly divided into two types, namely centrifugal pump oil system and spiral pump oil system. For the centrifugal pump oil system, when the compressor operates at medium and high frequencies, the pump oil capacity can ensure the reliability requirements of the compressor. When the frequency is too low, the centrifugal force becomes small, and the pump oil capacity becomes poor, and even the oil outlet cannot discharge oil. For the spiral pump oil system, the medium and low frequency pump oil capacity is good, but high frequency will also cause excessive pump oil. Excessive pump oil at high frequency will easily cause the oil discharge rate of the compressor to be too high, which will affect the reliability of the entire refrigeration system and the compressor.

[0005] Therefore, the existing technology has the problem that the frequency adaptation width of the pump oil system of the variable frequency compressor is small, and it is difficult to meet the wide frequency pump oil requirements of the variable frequency compressor. SUMMARY

[0006] The main purpose of the present application is to provide a pump oil device and a compressor to solve the problem that the frequency adaptation width of the pump oil system of the variable frequency compressor in the prior art is small, and it is difficult to meet the wide frequency pump oil requirements of the variable frequency compressor.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a pump oil device is provided, comprising: a crankshaft, the inside of the crankshaft having a mounting cavity, and the circumferential side wall of the crankshaft having an oil outlet hole communicating with the mounting cavity; a spiral oil pump structure, at least a part of the spiral oil pump structure being located inside the mounting cavity, the crankshaft being capable of rotating relative to the spiral oil pump structure, and the spiral oil pump structure having an oil discharge channel, the oil inlet hole of the oil discharge channel being located above the oil outlet hole.

[0008] Further, the oil discharge channel comprises an oil outlet cavity arranged inside the spiral oil pump structure, the oil outlet cavity being in communication with the bottom of the spiral oil pump structure, and the oil inlet hole being in communication with the oil outlet cavity.

[0009] Further, the oil inlet hole is arranged on the circumferential side wall of the spiral oil pump structure.

[0010] Further, the top of the spiral oil pump structure has an opening in communication with the oil outlet cavity.

[0011] Further, the circumferential side wall of the spiral oil pump structure at least inside the mounting cavity has an axial spiral oil groove, the oil outlet hole and the oil inlet hole being in communication with the spiral oil groove respectively.

[0012] Further, the mounting cavity comprises at least a first mounting section and a second mounting section in sequence, the first mounting section being below the second mounting section, the diameter of the first mounting section being greater than the diameter of the second mounting section, the oil outlet hole being arranged on the circumferential side wall of the crankshaft corresponding to the first mounting section, and the oil inlet hole being arranged on the circumferential side wall of the spiral oil pump structure corresponding to the second mounting section.

[0013] Further, the diameter of the part of the spiral oil pump structure inside the first mounting section is greater than the diameter of the part of the spiral oil pump structure inside the second mounting section.

[0014] Further, the spiral oil pump structure comprises a first connecting section and a second connecting section in sequence, the first connecting section being inside the first mounting section and being in clearance fit with the first mounting section, and the second connecting section being inside the second mounting section and being in clearance fit with the second mounting section.

[0015] Further, in the axial direction of the crankshaft, the distance between the one end of the first connecting section close to the second connecting section and the oil outlet hole is greater than or equal to 5mm and less than or equal to 10mm.

[0016] Further, there is a tapering section between the first connecting section and the second connecting section, which tapers towards the second connecting section, and there is a transition section corresponding to the tapering section between the first mounting section and the second mounting section.

[0017] Further, the bottom of the spiral oil pump structure is flush with the bottom of the crankshaft.

[0018] Further, the axis of the oil outlet cavity, the axis of the spiral oil pump structure, and the axis of the crankshaft are coincident; and / or the axis of the oil outlet hole and the axis of the oil inlet hole are perpendicular to the axis of the crankshaft respectively.

[0019] Further, there is a transition space between the top of the spiral oil pump structure and the top of the mounting cavity.

[0020] According to another aspect of the present application, a compressor is provided, comprising the above-mentioned oil pumping device.

[0021] Applying the technical solution of this invention, the oil pumping device in this application includes a crankshaft and a spiral oil pump structure. The crankshaft has an internal mounting cavity, and the circumferential sidewall of the crankshaft has an oil outlet hole communicating with the mounting cavity; at least a portion of the spiral oil pump structure is located inside the mounting cavity, the crankshaft is rotatable relative to the spiral oil pump structure, and the spiral oil pump structure has an oil discharge channel, with the oil inlet hole of the oil discharge channel located above the oil outlet hole.

[0022] When using the oil pumping device of this application, the bottom of the device can be located within the oil sump. Therefore, as the crankshaft rotates relative to the spiral oil pump structure, the oil in the sump rises between the crankshaft and the spiral oil pump to the oil outlet, allowing the oil between the crankshaft and the spiral oil pump to be discharged through the outlet, thus lubricating the crankshaft. Furthermore, since the oil inlet of the discharge channel is located above the oil outlet in the axial direction of the crankshaft, when the crankshaft speed increases, a portion of the oil between the crankshaft and the spiral oil pump can be discharged through the oil outlet, while another portion can enter the discharge channel through the oil inlet and return to the oil sump, effectively reducing the amount of oil discharged. Therefore, the oil pumping device of this application can effectively prevent excessive oil discharge when the crankshaft speed increases. Thus, the oil pumping device of this application effectively solves the problem that the existing variable frequency compressor oil pumping system has a small frequency adaptability width, making it difficult to meet the wide-frequency oil pumping requirements of variable frequency compressors. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 A cross-sectional view of a pumping device according to a specific embodiment of the present invention is shown;

[0025] Figure 2 It shows Figure 1 A schematic diagram of the spiral oil pump structure of the oil pumping device in the diagram;

[0026] Figure 3 It shows Figure 1 A schematic diagram of the crankshaft of the oil pump unit.

[0027] The above figures include the following reference numerals:

[0028] 10. Crankshaft; 11. Mounting cavity; 111. First mounting section; 112. Second mounting section; 113. Transition section; 114. Transition space; 12. Oil outlet; 20. Spiral oil pump structure; 21. Oil discharge channel; 211. Oil outlet chamber; 212. Oil inlet; 22. Spiral oil groove; 23. First connecting section; 24. Second connecting section; 25. Gradient section. DETAILED DESCRIPTION

[0029] It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0031] In the present application, unless otherwise specified, the orientation words such as "upper", "lower", "top", "bottom" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves; similarly, for the convenience of understanding and description, "inner" and "outer" refer to the inner and outer relative to the contour of the components themselves, but the above orientation words are not used to limit the present application.

[0032] In order to solve the problem that the frequency adaptation width of the oil pumping system of the variable frequency compressor in the prior art is small, and it is difficult to meet the wide frequency oil pumping requirement of the variable frequency compressor, the present application provides an oil pumping device and a compressor.

[0033] Moreover, the compressor in the present application has the oil pumping device described below. Meanwhile, the compressor in the present application generally refers to a variable frequency compressor.

[0034] As shown in Figures 1 to 3 The oil pumping device in the present application includes a crankshaft 10 and a spiral oil pump structure 20. The crankshaft 10 has an installation cavity 11 inside, and the circumferential side wall of the crankshaft 10 has an oil outlet hole 12 communicating with the installation cavity 11; at least a part of the spiral oil pump structure 20 is located inside the installation cavity 11, the crankshaft 10 can rotate relative to the spiral oil pump structure 20, and the spiral oil pump structure 20 has an oil discharge channel 21, and the oil inlet hole 212 of the oil discharge channel 21 is located above the oil outlet hole 12.

[0035] When the oil pumping device in the present application is used, the bottom of the oil pumping device can be located in the oil pool, so that the oil in the oil pool can be lifted to the oil outlet hole 12 between the crankshaft 10 and the helical oil pump structure 20 by the rotation of the crankshaft 10 relative to the helical oil pump structure 20, so that the oil between the crankshaft 10 and the helical oil pump structure 20 can be discharged from the oil outlet hole 12, thereby achieving the lubrication of the crankshaft 10. Moreover, since the oil inlet hole 212 of the oil discharge channel 21 is located above the oil outlet hole 12 in the axial direction of the crankshaft 10, when the rotation speed of the crankshaft 10 increases, part of the oil between the crankshaft 10 and the helical oil pump structure 20 can be discharged from the oil outlet hole 12, and the other part can enter the oil discharge channel 21 from the oil inlet hole 212 and return to the oil pool, thereby effectively reducing the oil discharge amount. Therefore, the oil pumping device in the present application can effectively avoid excessive oil discharge when the rotation speed of the crankshaft 10 increases. Therefore, the oil pumping device in the present application effectively solves the problem that the frequency adaptation width of the oil pumping system of the variable frequency compressor in the prior art is small, and it is difficult to meet the wide frequency pumping requirement of the variable frequency compressor.

[0036] Therefore, by using the oil pumping device in the present application, not only can the moving parts of the compressor be lubricated to reduce power consumption and protect the parts, thereby ensuring the reliable and stable movement of the compressor, but also the oil discharge amount can be effectively reduced.

[0037] Specifically, the circumferential side wall of the helical oil pump structure 20 located at least inside the mounting cavity 11 has an axially extending helical oil groove 22, and the oil outlet hole 12 and the oil inlet hole 212 communicate with the helical oil groove 22, respectively. Preferably, the helical oil groove 22 extends to the end of the helical oil pump structure 20 extending into the oil pool. By providing the helical oil groove 22, it can be effectively ensured that when the crankshaft 10 rotates relative to the helical oil pump structure 20, the oil in the oil pool can be transported through the helical oil groove 22, thereby ensuring that the oil in the oil pool can be discharged through the oil outlet hole 12 or enter the oil discharge channel 21 through the oil inlet hole 212 and return to the oil pool.

[0038] In one specific embodiment of the present application, the oil discharge channel 21 includes an oil outlet cavity 211 arranged inside the helical oil pump structure 20, the oil outlet cavity 211 communicates with the bottom of the helical oil pump structure 20, and the oil inlet hole 212 communicates with the oil outlet cavity 211. It should be noted that the volume of the oil outlet cavity 211 in this embodiment can be adjusted according to the actual use, so as to ensure that the oil will not leak out of the oil inlet hole 212 during the process of entering the oil outlet cavity 211. Moreover, the provision of the oil outlet cavity 211 in the present application can ensure that the oil can smoothly enter the oil outlet cavity 211 from the oil inlet hole 212 and return to the oil pool again.

[0039] Specifically, the oil inlet hole 212 is arranged on the circumferential side wall of the helical oil pump structure 20. By arranging in this way, the oil in the helical oil groove 22 can more easily enter the oil outlet cavity 211 through the oil inlet hole 212, thereby ensuring the stable operation of the oil pumping device in the application.

[0040] Specifically, the top of the helical oil pump structure 20 has an opening communicating with the oil outlet cavity 211. Moreover, the top of the helical oil pump structure 20 and the top of the mounting cavity 11 have a transition space 114. By arranging in this way, not only can the oil in the helical oil groove 22 more easily enter the inside of the oil outlet cavity 211 through the oil inlet hole 212, but also the assembly and disassembly between the crankshaft 10 and the helical oil pump structure 20 can be more easily.

[0041] In a specific embodiment of the application, the mounting cavity 11 at least includes a first mounting section 111 and a second mounting section 112 that are sequentially communicated, the first mounting section 111 is located below the second mounting section 112, the diameter of the first mounting section 111 is greater than the diameter of the second mounting section 112, the oil outlet hole 12 is arranged on the circumferential side wall of the crankshaft 10 corresponding to the first mounting section 111, and the oil inlet hole 212 is arranged on the circumferential side wall of the part of the helical oil pump structure 20 located in the second mounting section 112. Moreover, the diameter of the part of the helical oil pump structure 20 located in the first mounting section 111 is greater than the diameter of the part of the helical oil pump structure 20 located in the second mounting section 112. Preferably, the helical oil pump structure 20 includes a first connecting section 23 and a second connecting section 24 that are sequentially connected, the first connecting section 23 is located inside the first mounting section 111 and is in clearance fit with the first mounting section 111, and the second connecting section 24 is located inside the second mounting section 112 and is in clearance fit with the second mounting section 112. By arranging the diameter of the first connecting section 23 to be greater than the diameter of the second connecting section 24, it can be effectively ensured that the oil in the helical oil groove 22 can more quickly move to the oil inlet hole 212 and enter the oil outlet cavity 211 during the movement of the part of the helical oil groove 22 corresponding to the second connecting section 24.

[0042] Optionally, in the axial direction of the crankshaft 10, the distance between the one end of the first connecting section 23 close to the second connecting section 24 and the oil outlet hole 12 is greater than or equal to 5 mm and less than or equal to 10 mm.

[0043] Optionally, the first connecting section 23 and the second connecting section 24 have a tapering section 25 that gradually shrinks towards the second connecting section 24, and the transition section 113 is arranged between the first mounting section 111 and the second mounting section 112 corresponding to the tapering section 25.

[0044] In a preferred embodiment of the application, the bottom of the helical oil pump structure 20 is flush with the bottom of the crankshaft 10. By arranging in this way, the stability of the oil pumping device during operation can be ensured, thereby ensuring the use performance of the compressor.

[0045] Optionally, the axis of the oil outlet cavity 211, the axis of the helical oil pump structure 20, and the axis of the crankshaft 10 are coincident, and the axis of the oil outlet hole 12 and the axis of the oil inlet hole 212 are both perpendicular to the axis of the crankshaft 10. By such arrangement, it can be ensured that the oil in the helical oil groove 22 can be more easily discharged by the oil outlet hole 12, and more easily enter the oil outlet cavity 211 by the oil inlet hole 212 and return to the oil pool.

[0046] In one specific embodiment of the present application, the helical oil pump structure 20 is composed of a cylindrical tube which is the main body and has a first connecting section 23 and a second connecting section 24, and a helical oil groove 22 which is one of the key factors for oiling and can provide sufficient shearing force for the lubricating oil to enable it to rise with the rotation of the crankshaft 10.

[0047] As Figure 3The figure is a sectional view of the screw oil pump structure 20 and the crankshaft 10. In the piston compressor, the screw oil pump structure 20 is installed in the installation cavity 11 of the crankshaft 10, the bottoms of the two are aligned, the screw oil groove 22 on the screw oil pump structure 20 leaves a certain gap with the installation cavity 11, and when the compressor is running, the crankshaft 10 rotates while the screw oil pump structure 20 is stationary. When the rotating speed is low, the lubricating oil is lifted along the screw oil pump structure 20 to the position of the oil outlet hole 12 of the crankshaft 10 by the lift of the screw oil groove 22 and the friction of the gap, and then is transported through the oil groove on the crankshaft 10 to achieve the purpose of lubricating the crankshaft 10. At the same time, the lubricating oil is thrown out at the crank of the crankshaft 10 to further lubricate the piston of the compressor. Because the rotating speed is not high, and the first connecting section 23 of the screw oil pump structure 20 is 5-10 mm higher than the end of the second connecting section 24, the lubricating oil cannot continue to rise to the oil inlet hole 212 of the screw oil pump structure 20, so it is almost all taken away through the oil outlet hole 12 of the crankshaft 10. When the compressor is running at high frequency, the oil pumping amount of the oil pump is greatly increased, and under normal circumstances, if not controlled, a large amount of lubricating oil will be thrown out of the crankshaft 10, which will cause the compressor to suck in more lubricating oil in the cylinder, and the oil discharge is too large, and at the same time, it will also cause the oil tank to return oil not in time and the liquid level to be lowered. In the pump oil device of the present application, a large amount of lubricating oil reaches the oil outlet hole 12 of the crankshaft 10, and part of the lubricating oil continues to rise along the screw oil pump structure 20 to the position of the oil inlet hole 212, and because the diameter of the second connecting section 24 is smaller than the diameter of the first connecting section 23, the lubricating oil can be more quickly reached. In addition, because the screw oil pump structure 20 has an oil outlet cavity 211, and the oil outlet cavity 211 is communicated with the oil tank, the lubricating oil can flow back to the oil tank liquid level through the oil inlet hole 212. The advantage is that because a part of the oil is taken away, the flow and pressure of the lubricating oil flowing into the oil outlet hole 12 of the crankshaft 10 are greatly reduced, which can reduce the amount of oil thrown out at high frequency and reduce the oil discharge of the compressor. Therefore, the pump oil structure in the present application can sufficiently lubricate at low frequency and reduce the oil discharge at high frequency.

[0048] Optionally, for the formation of the screw oil groove in the present application, a helical protrusion extending in the axial direction can be added to the circumferential outer side wall of the screw oil pump structure, and the part of the circumferential outer side wall of the screw oil pump structure without the helical protrusion can form the screw oil groove.

[0049] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0050] 1. Effectively solve the problem that the frequency adaptation width of the pump oil system of the variable frequency compressor in the prior art is small, and it is difficult to meet the wide frequency pump oil requirement of the variable frequency compressor;

[0051] 2. Simple structure and stable performance.

[0052] Obviously, the above-described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work should belong to the protection scope of the present application.

[0053] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0054] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0055] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pump oiling device characterized by, The application relates to a crankshaft (10) with a mounting cavity (11) in the interior of the crankshaft (10) and a oil outlet hole (12) in the circumferential side wall of the crankshaft (10) and communicating with the mounting cavity (11); a spiral oil pump structure (20) at least partially located in the interior of the mounting cavity (11), the crankshaft (10) being rotatable relative to the spiral oil pump structure (20), and the spiral oil pump structure (20) having an oil discharge channel (21) with an oil inlet hole (212) located above the oil outlet hole (12). The mounting cavity (11) comprises at least a first mounting section (111) and a second mounting section (112) in sequence, the first mounting section (111) being located below the second mounting section (112), the diameter of the first mounting section (111) being larger than that of the second mounting section (112), and the oil outlet hole (12) being located in the circumferential side wall of the crankshaft (10) corresponding to the first mounting section (111), and the oil inlet hole (212) being arranged in the circumferential side wall of the part of the spiral oil pump structure (20) located in the second mounting section (112). The diameter of the part of the spiral oil pump structure (20) located in the first mounting section (111) is larger than that of the part of the spiral oil pump structure (20) located in the second mounting section (112). The oil discharge channel (21) comprises an oil outlet cavity (211) arranged in the interior of the spiral oil pump structure (20), the oil outlet cavity (211) communicating with the bottom of the spiral oil pump structure (20), and the oil inlet hole (212) communicating with the oil outlet cavity (211). The oil inlet hole (212) is arranged in the circumferential side wall of the spiral oil pump structure (20).

2. The oil pumping device according to claim 1, characterized in that The top of the spiral oil pump structure (20) has an opening communicating with the oil outlet cavity (211).

3. The oil pumping device according to claim 1, characterized in that, The circumferential side wall of the spiral oil pump structure (20) at least located in the interior of the mounting cavity (11) has an axially extending spiral oil groove (22), and the oil outlet hole (12) and the oil inlet hole (212) respectively communicate with the spiral oil groove (22).

4. The oil pumping device according to claim 2, characterized in that The spiral oil pump structure (20) comprises a first connecting section (23) and a second connecting section (24) connected in sequence, the first connecting section (23) being located in the interior of the first mounting section (111) and being in clearance fit with the first mounting section (111), and the second connecting section (24) being located in the interior of the second mounting section (112) and being in clearance fit with the second mounting section (112).

5. The oil pumping device according to claim 1, wherein In the axial direction of the crankshaft (10), the distance between the first connecting section (23) and the oil outlet hole (12) is greater than or equal to 5 mm and less than or equal to 10 mm.

6. The oil pumping device according to claim 1, wherein ​ 7. The oil pumping device according to claim 6, characterized in that ​ 8. The oil pumping device according to claim 6, characterized in that The first connecting section (23) and the second connecting section (24) have a tapering section (25) gradually tapering towards the second connecting section (24), and the first mounting section (111) and the second mounting section (112) are provided with a transition section (113) corresponding to the tapering section (25).

9. The oil pumping device according to any one of claims 1 to 5, characterized in that, The bottom of the spiral oil pump structure (20) is flush with the bottom of the crankshaft (10).

10. The oil pumping device according to claim 2, characterized in that, the axis of the oil outlet cavity (211), the axis of the spiral oil pump structure (20), and the axis of the crankshaft (10) coincide; and / or the axis of the oil outlet hole (12) and the axis of the oil inlet hole (212) are respectively perpendicular to the axis of the crankshaft (10).

11. The oil pumping device according to any one of claims 1 to 5, characterized in that The top of the spiral oil pump structure (20) and the top of the mounting cavity (11) have a transition space (114).

12. A compressor characterized by, An oil pumping device according to any one of claims 1 to 11.

Images