Pump body structure and oil delivery pump

Abstract

The pump body structure comprises a shell and an end cover, the end cover is arranged at one end of the shell, a containing cavity is formed in the end cover, a rotor assembly is arranged in the containing cavity, and a pump cover for sealing the rotor assembly is arranged between the shell and the end cover. The pump cover is provided with a drainage structure communicated with the rotor assembly, the side wall of the containing cavity is provided with at least one pressure stabilizing cavity, and the drainage structure is communicated with one pressure stabilizing cavity and used for guiding at least part of oil in the rotor assembly into the pressure stabilizing cavity. The pressure stabilizing cavity is arranged between the rotor assembly and the end cover, oil entering the pressure stabilizing cavity can form an oil film between the rotor assembly and the end cover so as to reduce friction between the rotor assembly and the end cover, meanwhile, the pressure stabilizing cavity can reduce the contact area between the rotor assembly and the end cover, and therefore abrasion is reduced, and the service life of all parts is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of oil pumps, and in particular to a pump body structure and an oil pump. Background Art

[0002] The rotor oil pump is mainly composed of an inner rotor and an outer rotor. The inner rotor and the outer rotor are arranged in the pump body. The inner rotor is eccentrically arranged in the outer rotor to form an oil suction chamber and an oil pressure chamber. The various components are closely matched. The inner rotor is driven by the driving device to drive the outer rotor to rotate. As the volume of the oil suction chamber and the oil pressure chamber changes, the medium is transported.

[0003] For example, in an electronic oil pump transmission structure with publication number CN110701042B, the inner rotor and outer rotor are installed in a cavity on the pump casing. The rotation of the inner rotor and the outer rotor will cause friction between the pump casing and the end cover, making lubrication difficult. During operation, direct surface-to-surface contact and friction will occur for a long time without providing lubrication, which will generate additional high temperature, iron chips or aluminum chips, causing increased wear, directly affecting the working efficiency of the oil pump and shortening its service life. Utility Model Content

[0004] The present application provides a pump body structure to solve the above-mentioned deficiencies in the prior art, and specifically adopts the following technical solutions:

[0005] A pump body structure includes a shell and an end cover, wherein the end cover is arranged at one end of the shell, a receiving cavity is arranged in the end cover, a rotor assembly is arranged in the receiving cavity, a pump cover for sealing the rotor assembly is arranged between the shell and the end cover, a drainage structure corresponding to the rotor assembly is arranged on the pump cover, at least one pressure-stabilizing cavity is arranged on the side wall of the receiving cavity, and the drainage structure connects the rotor assembly and one of the pressure-stabilizing cavities, and is used to guide at least part of the oil in the rotor assembly into the pressure-stabilizing cavity.

[0006] Preferably, the drainage structure is arranged on a side of the pump cover close to the accommodating chamber.

[0007] Preferably, the drainage structure includes a drainage groove and an oil storage groove, the oil storage groove is correspondingly connected to the rotor assembly, and the drainage groove connects the oil storage groove with the pressure stabilizing chamber.

[0008] Preferably, at least one annular flow channel is provided on the side wall of the accommodating cavity, and the annular flow channel connects the pressure-stabilizing cavities to each other, so that the oil storage tank is connected to each pressure-stabilizing cavity, so as to facilitate the oil to enter each pressure-stabilizing groove.

[0009] Preferably, the pressure stabilizing chambers are evenly distributed on the side walls of the accommodating chamber in a circumferential direction around the axis of the end cover.

[0010] Preferably, an oil inlet and an oil outlet are provided on the end cover, and the oil inlet and the oil storage port are respectively connected to the accommodating cavity.

[0011] Preferably, the rotor assembly comprises an inner rotor and an outer rotor, and the inner rotor is eccentrically arranged on the outer rotor to form an oil suction chamber and an oil pressure chamber.

[0012] Further preferably, it also includes a driving device, which is arranged in the housing, and a driving shaft of the driving device passes through the pump cover to be rotatably connected to the end cover, and the inner rotor is arranged on the driving shaft.

[0013] The present application also provides an oil pump including the pump body structure described above.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) At least one pressure-stabilizing chamber is provided on the side wall of the accommodating chamber for placing the rotor assembly, and a drainage structure connecting the rotor assembly and the pressure-stabilizing chamber is provided on the pump cover. Through the pressure difference, part of the oil in the rotor assembly can be guided into the pressure-stabilizing chamber through the drainage structure, thereby forming an oil film between the rotor assembly, the pump cover and the end cover, which can reduce the wear between the rotor assembly and the pump cover and the end cover, improve the working efficiency and increase the service life of the pump.

[0016] (2) Based on the above, at least one annular flow channel is provided on the side wall of the accommodating cavity, and the annular flow channel is connected to each pressure-stabilizing cavity. The oil can be transported to each pressure-stabilizing cavity through the drainage structure, which can further ensure the formation of a stable oil film between the rotor assembly, the pump cover and the end cover to prevent the oil film from rupturing. When the oil film ruptures, a new oil film can be formed in time. At the same time, the setting of the pressure-stabilizing cavity and the annular flow channel can reduce the contact area between the rotor assembly and the end cover, thereby further reducing wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional schematic diagram of the present application;

[0018] Figure 2 is a half-section schematic diagram of the present application;

[0019] Figure 3 is a three-dimensional schematic diagram of the end cap of the present application;

[0020] Figure 4 It is a schematic diagram of the pump cover structure of the present application.

[0021] In the figure:

[0022] 1- housing;

[0023] 2-end cover, 20-accommodating chamber, 201-pressure stabilizing chamber;

[0024] 3-pump cover, 31-drainage structure, 311-oil storage tank, 312-drainage tank;

[0025] 4-rotor assembly, 41-inner rotor, 42-outer rotor;

[0026] 5- annular flow channel, 6- driving device. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described in the present application are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0028] See also Figures 1 to 4 , further illustrating the present application, the pump body structure comprises a shell 1 and an end cover 2, the end cover 2 being arranged at one end of the shell 1, a receiving chamber 20 being arranged in the end cover 2, a rotor assembly 4 being arranged in the receiving chamber 20, a pump cover 3 for sealing the rotor assembly 4 being arranged between the shell 1 and the end cover 2, a drainage structure 31 corresponding to the rotor assembly 4 being arranged on the pump cover 3, specifically, the drainage structure 31 being arranged on a side of the pump cover 2 close to the receiving chamber 20; at least one pressure stabilizing chamber 201 being arranged on the side wall of the receiving chamber 20, wherein the pressure stabilizing chamber 201 is arc-shaped, but not limited thereto; the drainage structure 31 connects the rotor assembly 4 and any one of the pressure stabilizing chambers 201 is used to guide at least part of the oil in the rotor assembly 4 into the pressure-stabilizing chamber 201. The oil entering the pressure-stabilizing chamber 201 provides oil lubrication between the end cover 2 and the rotor assembly 4 to form an oil film. At the same time, the oil entering the pressure-stabilizing chamber 201 can buffer the radial vibration of the rotor assembly 4 and avoid mechanical shock. When the rotor assembly 4 rotates at a high speed, the oil in the pressure-stabilizing chamber 201 can be replenished in time to prevent the oil film from rupturing, so as to reduce the wear between the rotor assembly 4 and the end cover 2. The drainage structure 31 cooperates with the pressure-stabilizing chamber 201 to form a lubrication structure to lubricate the rotor assembly 4, the end cover 2 and the pump cover 3.

[0029] Combination Figure 3 , the pressure-stabilizing chambers 201 are evenly distributed on the side walls of the accommodating chamber 20 in the circumferential direction around the axis of the end cover 2; in the present embodiment, there are two pressure-stabilizing chambers 201, and the pressure-stabilizing chambers 201 can extend along the axial direction of the end cover 2 or be obliquely arranged on the side walls of the accommodating chamber 20. The number of the pressure-stabilizing chambers 201 can be increased or decreased as needed, and there is no limitation here.

[0030] Combination Figure 2The rotor assembly 4 includes an inner rotor 41 and an outer rotor 42, and the inner rotor 41 is eccentrically arranged on the outer rotor 42 to form an oil suction chamber and an oil pressure chamber; when the rotor assembly 4 is working, the oil will be transported from the oil suction chamber to the oil pressure chamber through the volume change of the oil suction chamber and the oil pressure chamber. During this process, a part of the oil will enter the pressure stabilizing chamber 201 through the drainage structure 31.

[0031] Combination Figure 2 , the drainage structure 31 is connected to the rotor assembly 4, wherein the drainage structure 31 includes a drainage groove 312 and an oil storage groove 311, the oil storage groove 311 is correspondingly connected to the rotor assembly 4, and the drainage groove 312 connects the oil storage groove 311 with the pressure stabilizing chamber 201; when the rotor assembly 4 is working, part of the oil in the rotor assembly 4 will enter the oil storage groove 311, and there is a pressure difference between the pressure stabilizing chamber 201 and the rotor assembly 4. Therefore, the oil in the oil storage groove 311 will enter the pressure stabilizing chamber 201 through the drainage groove 312, and form an oil film between the end cover 2, the pump cover 3 and the rotor assembly 4 to reduce wear; when the rotor assembly 4 rotates at a high speed, the oil entering the pressure stabilizing chamber 201 also has a certain cooling effect.

[0032] In some embodiments, in combination Figure 3 , at least one annular flow channel 5 is provided on the side wall of the accommodating chamber 20. In the present embodiment, the annular flow channel 5 is arranged on the outer edge of the accommodating chamber 20 close to the pump cover 3, the annular flow channel 5 forms a chamfer at the outer edge, and there is one annular flow channel 5; the drainage groove 312 is connected to the annular flow channel 5, and the oil entering the annular flow channel 5 will flow to each of the pressure-stabilizing chambers 201 respectively; wherein, the annular flow channel 5 can also be arranged horizontally or obliquely on the side wall of the accommodating chamber 20; at this time, the oil first enters one of the pressure-stabilizing chambers 201 through the drainage structure 31, and then enters each of the pressure-stabilizing chambers 201 through the annular flow channel 5, which can realize the pressure-stabilizing chambers 201 of each. The pressure-stabilizing chamber 201 is connected; the annular flow channel 5 connects the pressure-stabilizing chambers 201 to each other, and the oil in the oil storage tank 311 can flow to each pressure-stabilizing chamber 201 through the drainage groove 312 through the annular flow channel 5, so that the oil can enter each pressure-stabilizing chamber 201 respectively. Since multiple pressure-stabilizing chambers 201 provide oil lubrication between the rotor assembly 4 and the end cover 2 at the same time, it is further ensured that the stability of the oil film will not break or the oil can be replenished in time to form a new oil film after the oil film breaks. The setting of the pressure-stabilizing chamber 201 and the annular flow channel 5 can reduce the contact surface between the rotor assembly 4 and the end cover 2, thereby further reducing wear.

[0033] The end cover 2 is provided with an oil inlet and an oil outlet, and the oil inlet and the oil outlet are respectively connected to the accommodating chamber 20. Specifically, the oil inlet corresponds to the oil suction chamber, and the oil outlet corresponds to the oil pressure chamber.

[0034] It also includes a driving device 6, which is arranged in the housing 1, wherein the driving shaft of the driving device 6 passes through the pump cover 3 and is rotatably connected to the end cover 2, and the inner rotor 41 is arranged on the driving shaft; when working, the driving device 6 drives the rotor assembly 4 to rotate through the driving shaft to realize the transportation of oil.

[0035] The present application also provides an oil pump including the pump body structure described above. When the oil pump is working, the pump body structure can lubricate the rotor assembly 4 and the pump cover 3 and the end cover 2 to reduce wear, thereby improving the service life and working efficiency of the oil pump.

Claims

1. Pump body structure, characterized by: It includes a shell and an end cover, the end cover is arranged at one end of the shell, a accommodating cavity is arranged in the end cover, a rotor assembly is arranged in the accommodating cavity, a pump cover for sealing the rotor assembly is arranged between the shell and the end cover, a drainage structure corresponding to the rotor assembly is arranged on the pump cover, at least one pressure-stabilizing cavity is arranged on the side wall of the accommodating cavity, the drainage structure connects the rotor assembly and one of the pressure-stabilizing cavities, and is used to guide at least part of the oil in the rotor assembly into the pressure-stabilizing cavity.

2. The pump structure according to claim 1, characterized in that: The drainage structure is arranged on a side of the pump cover close to the accommodating cavity.

3. The pump structure according to claim 1, characterized in that: The drainage structure includes a drainage groove and an oil storage groove. The oil storage groove is correspondingly connected to the rotor assembly, and the drainage groove connects the oil storage groove with the pressure stabilizing chamber.

4. The pump structure according to claim 3, characterized in that: At least one annular flow channel is provided on the side wall of the accommodating cavity, and the annular flow channel connects the pressure stabilizing cavities to each other, so that the oil storage tank is connected to the pressure stabilizing cavities.

5. The pump structure according to claim 1, characterized in that: The pressure stabilizing chambers are evenly distributed on the side walls of the accommodating chamber in a circumferential direction around the axis of the end cover.

6. The pump structure according to claim 1, characterized in that: The end cover is provided with an oil inlet and an oil outlet, and the oil inlet and the oil outlet are respectively connected to the accommodating cavity.

7. The pump structure according to claim 1, characterized in that: The rotor assembly comprises an inner rotor and an outer rotor, wherein the inner rotor is eccentrically arranged on the outer rotor to form an oil suction chamber and an oil pressure chamber.

8. The pump structure according to claim 7, characterized in that: It also includes a driving device, which is arranged in the shell. The driving shaft of the driving device passes through the pump cover and is rotatably connected to the end cover. The inner rotor is arranged on the driving shaft.

9. An oil pump, characterized in that: The pump body structure comprises the pump body structure according to any one of claims 1 to 8.

Images