Pump body assembly and compressor

Abstract

The application provides a pump body assembly and a compressor. The pump body assembly comprises a crankshaft and a lower flange, the crankshaft comprises a short shaft part, part of the short shaft part passes through the lower flange, a counterweight is arranged in a ring shape and fixedly sleeved on the short shaft part, and the lower end surface of the ring shape abuts against the lower flange. The application sleeves the counterweight on the short shaft part of the crankshaft, the counterweight abuts against the lower flange, the lower end surface of the counterweight forms a ring-shaped thrust surface, the eccentric thrust condition does not occur, the wear of the lower end surface of the eccentric part of the crankshaft is avoided, the compressor runs more stably, the energy efficiency of the compressor is improved, and the reliability of the operation of the rotor compressor is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of compressors, and particularly relates to a pump body assembly and a compressor. BACKGROUND

[0002] A conventional rotor compressor pump body assembly is mainly composed of a cylinder, a roller, a crankshaft, upper and lower flanges, a sliding vane and the like components. The conventional crankshaft has a thrust surface and an oil hole. The thrust surface is used to reduce the wear of the vertical contact surface between the crankshaft and the lower flange during the operation of the rotor compressor. The oil hole is used to improve the efficiency of the rotor compressor in the oil content test. The rotor compressor may have a high power when it operates at a low frequency. Since the thrust surface of the crankshaft is distributed on one side of the eccentric portion of the crankshaft, the horizontal contact surface between the crankshaft and the roller and the upper and lower flanges may be worn out during the normal operation of the rotor compressor, thereby reducing the reliability of the rotor compressor. SUMMARY

[0003] Therefore, the application provides a pump body assembly and a compressor, which can solve the problem that the thrust surface of the crankshaft is distributed on one side of the eccentric portion of the crankshaft, and the horizontal contact surface between the crankshaft and the roller and the upper and lower flanges is worn out.

[0004] In order to solve the above problems, the application provides a pump body assembly, which comprises:

[0005] a crankshaft and a lower flange, wherein the crankshaft comprises a short shaft portion; and part of the short shaft portion penetrates through the lower flange.

[0006] a counterweight, which is annular and fixedly sleeved on the short shaft portion; and the lower end surface of the annular counterweight abuts against the lower flange.

[0007] Optionally, the upper end surface of the lower flange is provided with a groove, the counterweight is arranged in the groove, and the counterweight is in sliding fit with the bottom surface of the groove.

[0008] Optionally, the upper end surface of the counterweight is spaced apart from the eccentric portion of the crankshaft.

[0009] Optionally, the outer circumferential surface of the counterweight is tapered in the axial direction from the eccentric portion to the lower flange.

[0010] Optionally, the outer circumferential surface is in a stepped shape.

[0011] Optionally, the groove is circular, and the radius of the groove is smaller than the maximum rotation radius of the eccentric portion.

[0012] Optionally, the depth of the groove is the same as the axial height of the counterweight.

[0013] Optionally, the short shaft portion is provided with an axial oil hole, and the short shaft portion and the counterweight are both provided with a radial oil hole corresponding to the axial oil hole.

[0014] According to another aspect of the present application, a compressor is provided, which comprises the pump body assembly as described above.

[0015] The pump body assembly provided by the present application comprises a crankshaft and a lower flange, the crankshaft comprises a short shaft portion, part of the short shaft portion passes through the lower flange, and a counterweight is arranged in a ring shape and fixedly sleeved on the short shaft portion, with the lower end surface of the ring shape abutting against the lower flange.

[0016] The present application sleeves the counterweight on the short shaft portion of the crankshaft, the counterweight abuts against the lower flange, and the lower end surface of the counterweight forms a ring-shaped thrust surface, so that the eccentric thrust does not occur, the wear of the lower end surface of the eccentric portion of the crankshaft is avoided, the compressor runs more stably, the energy efficiency of the compressor is improved, and the reliability of the operation of the rotary compressor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Fig. 1 is a schematic view of the internal structure of the compressor of the embodiment of the present application;

[0018] Figure 2 Fig. 2 is a schematic view of the structure of the crankshaft of the embodiment of the present application, in which the counterweight is sleeved;

[0019] Figure 3 Fig. 3 is a front view of the counterweight of the embodiment of the present application;

[0020] Figure 4 Fig. 4 is a side view of the counterweight of the embodiment of the present application.

[0021] The reference signs are as follows:

[0022] 1, motor assembly; 2, crankshaft; 3, upper flange; 4, sliding vane; 5, roller; 6, cylinder; 7, counterweight; 8, radial oil hole; 9, lower flange. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described clearly and completely below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without making any creative effort fall within the scope of protection of the present application.

[0024] It is to be understood that the terms "first", "second", and the like, used in the description and the claims of the present application as well as the above description of the drawings merely refer to the structure described above, and do not necessitate or imply any actual limiting of the order or sequence of the structure. It is to be understood that the use of the terms so or the like herein is not to be construed to limit the scope of the application to only those embodiments which can be described by the terms so or the like. Furthermore, the terms "comprise", "comprising", "have", "having", "include", "including", "contain", "containing", and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, product, or apparatus that comprises, has, includes, contains one or more steps or units listed need not comprise, have, include, or contain only those one or more steps or units, but can include other steps or units not expressly listed or inherent to such process, method, system, product, or apparatus.

[0025] With reference to the accompanying drawings, in which Figures 1 to 4 As shown, according to the embodiments of the present application, a pump body assembly comprises:

[0026] a crankshaft 2 comprising a short shaft portion; part of the short shaft portion passes through the lower flange 9;

[0027] a counterweight 7 arranged annularly on the short shaft portion and abutting against the lower flange 9.

[0028] The present application sets the counterweight 7 on the short shaft portion of the crankshaft 2, and the counterweight 7 abuts against the lower flange 9. The lower end surface of the counterweight 7 forms an annular thrust surface, so that eccentric thrust does not occur, and the wear of the lower end surface of the eccentric portion of the crankshaft 2 is avoided, so that the compressor operates more stably, and the efficiency of the compressor and the reliability of the operation of the rotor compressor are improved.

[0029] The present application uses the annular counterweight 7 in cooperation with the crankshaft 2, so that the moment of inertia of the crankshaft 2 is increased, the power of the compressor during low-frequency operation is reduced, and the efficiency of the compressor is improved.

[0030] The counterweight 7 of the present application is annular in structure, and the lower end surface thereof is a thrust surface. The structure is also annular, so that the excess wear of the crankshaft 2 and various parts in the horizontal plane during the operation of the compressor is reduced.

[0031] In some embodiments, the upper end surface of the lower flange 9 is provided with a groove, and the counterweight 7 is arranged in the groove and in sliding cooperation with the bottom surface of the groove.

[0032] In order to avoid affecting the rotation of the crankshaft 2 eccentric portion and the roller 5 in the cylinder 6, a groove accommodating the counterweight 7 is arranged on the lower flange 9, and the improvement is simple and convenient to manufacture.

[0033] In some embodiments, the upper end surface of the counterweight 7 is spaced apart from the eccentric portion of the crankshaft 2.

[0034] The upper end surface of the counterweight 7 and the eccentric portion of the crankshaft 2 are arranged in a spaced manner, since the counterweight 7 is fixedly sleeved on the crankshaft 2 and the two are coaxially rotated, the spaced arrangement facilitates the assembly and replacement of the counterweight 7.

[0035] In some embodiments, the outer circumferential surface of the counterweight 7 is arranged in a tapered manner along the axial direction from the eccentric portion to the lower flange 9. Preferably, the outer circumferential surface is arranged in a stepped manner.

[0036] The downwardly tapered structure of the counterweight 7 forms an oil storage space in the groove, which can ensure the lubrication effect between the counterweight 7 and the lower flange 9 and reduce friction.

[0037] In some embodiments, the groove is circular and has a radius smaller than the maximum rotating radius of the eccentric portion. Alternatively, the depth of the groove is the same as the axial height of the counterweight 7.

[0038] The structure of the groove is limited to ensure that high-pressure gas does not enter the groove when the eccentric portion rotates, and to avoid the need for corresponding improvements to the original component structure.

[0039] In some embodiments, an axial oil hole is arranged in the short shaft portion, and a radial through hole is arranged in the corresponding position of the short shaft portion and the counterweight 7, and the radial through hole communicates with the axial oil hole.

[0040] The radial oil hole 8 communicating with the axial oil hole is arranged on the short shaft portion and the counterweight 7, and the annular counterweight 7 is provided with an oil hole structure in the radial direction, which can improve the oil storage rate during the operation of the compressor, and the efficiency is better even when the compressor is tested for oil content.

[0041] According to another aspect of the present application, a compressor is provided, which comprises the pump body assembly as described above.

[0042] As shown in Figure 1 The compressor of the present application comprises main components: a motor assembly 1, a crankshaft 2, an upper flange 3, a sliding vane 4, a roller 5, a cylinder 6, a counterweight 7, a radial oil hole 8, and a lower flange 9. The present application increases the annular counterweight 7 on the short shaft portion of the crankshaft 2 to cooperate with the crankshaft 2, and uses the annular structure of the counterweight 7 to solve the excessive wear between the crankshaft 2 and the lower flange 9 during the operation of the compressor, thereby improving the efficiency of the compressor, and increasing the rotational inertia by increasing the annular counterweight 7 to reduce the power of the compressor during low-frequency operation.

[0043] The assembly method of the present application is very simple. Before the lower flange 9 of the conventional rotor compressor is installed, the designed counterweight 7 is assembled with the short shaft portion of the crankshaft 2 by hot fitting or cold pressing, and the rest is installed according to the conventional rotor compressor.

[0044] Those skilled in the art can easily understand that the above-mentioned various embodiments can be freely combined and superimposed without conflict.

[0045] The above merely describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above merely describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pump body assembly, characterized in that, include: A crankshaft (2) and a lower flange (9), the crankshaft (2) including a short shaft portion; a portion of the short shaft portion passes through the lower flange (9); The counterweight (7) is configured as an annular shape fixedly fitted on the short shaft portion; the lower end face of the annular shape abuts against the lower flange (9); The lower end face of the counterweight (7) forms an annular thrust surface, and the counterweight (7) has an annular structure; The upper end face of the lower flange (9) is provided with a groove, the counterweight (7) is provided in the groove and slides with the bottom surface of the groove; the upper end face of the counterweight (7) slides with the roller (4); The outer peripheral surface of the counterweight (7) is tapered along the axial direction from the eccentric part of the crankshaft (2) to the lower flange (9); the outer peripheral surface is stepped; the counterweight (7) adopts a downward tapering structure, so that the groove forms an oil storage space.

2. The pump body assembly according to claim 1, characterized in that, The upper end face of the counterweight (7) is spaced apart from the eccentric part of the crankshaft (2).

3. The pump body assembly according to any one of claims 1-2, characterized in that, The groove is circular, and its radius is smaller than the maximum rotation radius of the eccentric part of the crankshaft (2).

4. The pump body assembly according to claim 3, characterized in that, The depth of the groove is the same as the axial height of the counterweight (7).

5. The pump body assembly according to claim 1, characterized in that, The short shaft portion is provided with an axial oil hole, and the short shaft portion and the counterweight (7) are provided with radial through holes at corresponding positions, and the radial through holes are connected to the axial oil hole.

6. A compressor, characterized in that, Includes the pump body assembly as described in any one of claims 1-5.

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