Vacuum oil return auxiliary device

Abstract

The invention discloses a vacuum oil return auxiliary device which is used for enabling oil in an oil return channel to flow back to a preset oil tank and comprises an oil storage container and a vacuum generator. Wherein the oil storage container comprises an oil inlet and an oil outlet, the oil inlet is connected with the oil return channel, and the oil outlet is connected with the oil tank through an on-off valve; the vacuum generator comprises an air inlet, an exhaust port and a connector, the air inlet is connected with a pressure air source, the exhaust port is communicated with the external environment, and the connector is connected to the top of the oil storage container through a pipeline. The vacuum oil return auxiliary device at least can solve the problems that in the prior art, an oil return auxiliary device needed in the oil return process of hydraulic oil is complex and high in cost.

Description

Technical Field

[0001] The invention relates to the technical field of liquid static pressure functional part components, and in particular to a vacuum oil return auxiliary device. Background Art

[0002] Liquid hydrostatic technology occupies an important position in high-end machine tools with its unique advantages. Liquid hydrostatic technology forms a layer of lubricating oil film to separate the working surface of the guide rail, thereby achieving a very small friction coefficient, greatly reducing the driving power, and making the guide rail movement lighter and more flexible. At the same time, since the working surface of the guide rail is not in direct contact, wear is very small, the service life is extended, and the original accuracy can be maintained for a long time. In addition, liquid hydrostatic guides have high load-bearing capacity and rigidity, can withstand large loads and maintain stable motion accuracy, and the oil film error equalization effect also makes its motion accuracy much higher than the part processing accuracy.

[0003] Although liquid hydrostatic technology has the above advantages, there are still certain deficiencies in the existing technology in terms of hydraulic oil return. At present, there are two ways to return hydraulic oil: natural return and compressed air assisted return. However, of these two methods, the natural return method requires a larger return tank and is prone to poor oil return, which leads to oil leakage and eventually causes the liquid functional components to fail to work properly. The compressed air assisted oil return method requires the compressed air to be dried and filtered, and an oil-gas separation device must be installed. The structure is relatively complex and increases production costs. In addition, the air discharge process may also take away part of the hydraulic oil, resulting in a decrease in oil viscosity, which causes a decrease in oil quality and accelerated oil loss. Summary of the invention

[0004] The main purpose of the present invention is to provide a vacuum oil return auxiliary device, which at least solves the problem that the oil return auxiliary device required in the oil return process of hydraulic oil in the prior art is relatively complex and has a high cost.

[0005] According to one aspect of the present invention, there is provided a vacuum oil return auxiliary device, which is used to return the oil in the oil return channel to a predetermined oil tank, comprising:

[0006] An oil storage container, the oil storage container comprising an oil inlet and an oil outlet, the oil inlet being connected to the oil return passage, and the oil outlet being connected to the oil tank via an on-off valve;

[0007] A vacuum generator, the vacuum generator comprises an air inlet, an exhaust port and a connecting port, the air inlet is connected to a pressure air source, the exhaust port is communicated with an external environment, and the connecting port is connected to the top of the oil storage container through a pipeline.

[0008] Furthermore, the on-off valve is arranged at the bottom of the oil storage container, the on-off valve is connected to the oil storage container by threaded cooperation, and an oil outlet is arranged at the bottom of the oil storage container, the on-off valve is communicated with the oil outlet, and the bottom surface of the oil storage container has an inclined surface inclined toward the oil outlet.

[0009] Furthermore, the on-off valve includes a one-way valve.

[0010] Furthermore, the air inlet of the vacuum generator is connected to the pressure air source via a first pipeline, and a solenoid valve is provided on the first pipeline.

[0011] Furthermore, the oil storage container includes a main body, a cover plate and a sealing gasket, the main body is provided with a accommodating cavity for accommodating oil and an opening connected to the accommodating cavity, the cover plate is fixed to the main body by screws to cover the opening, and the sealing gasket is arranged between the cover plate and the main body.

[0012] Furthermore, a joint is provided on the cover plate, the joint passes through the cover plate and is in communication with the cavity, and the joint is connected to the connecting port on the vacuum generator via a second pipeline.

[0013] Furthermore, the vacuum oil return auxiliary device also includes a filter, which includes a first interface and a second interface, the first interface is connected to the connecting port of the vacuum generator through a pipeline, and the second interface is connected to the joint set at the top of the oil storage container through a pipeline, and the air in the oil storage container enters the vacuum generator after being filtered by the filter and is discharged through the exhaust port.

[0014] Furthermore, a mounting plate is provided at the bottom of the oil storage container, the vacuum generator is fixedly mounted on the mounting plate by screws, and the filter is arranged on one side of the vacuum generator.

[0015] Furthermore, the opening pressure F of the on-off valve, the weight W of the oil in the oil storage container, and the cross-sectional area S of the pipe provided between the oil storage container and the on-off valve satisfy the relationship: W=FS.

[0016] Furthermore, when the on-off valve is opened, the volume V1 of the oil in the oil storage container and the volume V2 of the oil storage container satisfy the relationship: V1≤V2 / 5.

[0017] In the present invention, the oil inlet of the oil storage container is connected to the oil return channel pipeline, and the oil storage container also includes an oil outlet, and the oil outlet is connected to the oil tank through an opening and closing valve. A vacuum generator is arranged on one side of the oil storage container. The vacuum generator includes an air inlet, an exhaust port and a connecting port, wherein the air inlet is connected to a pressure gas source, the exhaust port is connected to the external environment, and the connecting port is connected to the top of the oil storage container through a pipeline. With such an arrangement, a closed space is formed in the oil storage container through the connection of the pipeline. When the vacuum generator is started, air is evacuated inside the oil storage container to form a vacuum environment, and the oil in the oil return pipeline is more likely to enter the oil storage container due to the effect of the external pressure. When the amount of oil in the oil storage container reaches a predetermined amount, the opening and closing valve will open immediately, which is more suitable for the oil to flow back to the oil tank. In addition, by reasonably setting the connection position with the vacuum generator on the oil storage container, the small amount of oil in the oil storage container will not enter the vacuum generator during the vacuum process; at the same time, an opening and closing valve is provided at the oil outlet of the oil storage container, so that the oil in the oil tank will not be pumped into the oil storage container during the vacuum process.

[0018] That is to say, the present invention can realize smooth oil return by adding a vacuum oil return auxiliary device on the basis of natural oil return, and has low requirements on the capacity design of the oil storage container. In addition, the vacuum oil return auxiliary device in the present invention will not cause the problem of oil mixing with air and rapid oil loss, and there is no need to set up a separate oil-gas separation device, which simplifies the device structure and further reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 It is a structural schematic diagram of a vacuum oil return auxiliary device disclosed in an embodiment of the present invention at a first viewing angle;

[0021] Figure 2 A cross-sectional view of the vacuum oil return auxiliary device disclosed in an embodiment of the present invention at a first viewing angle;

[0022] Figure 3 A top view of a vacuum oil return auxiliary device disclosed in an embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of the overall structure of the vacuum oil return auxiliary device disclosed in an embodiment of the present invention;

[0024] Figure 5 The figure is a schematic diagram of the oil return principle of the vacuum oil return auxiliary device disclosed in an embodiment of the present invention.

[0025] The above drawings include the following reference numerals:

[0026] 10. Oil storage container; 101. Oil inlet; 102. Oil outlet; 11. Main body; 111. Inclined surface; 12. Cover plate; 121. Connector; 13. Sealing gasket; 14. Screw; 20. On-off valve; 30. Vacuum generator; 31. Air inlet; 32. Connecting port; 33. First pipeline; 40. Pressure air source; 41. Solenoid valve; 50. Filter; 51. First interface; 52. Second interface; 53. Second pipeline; 60. Mounting plate; 70. Oil tank; 80. Muffler. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0030] As mentioned in the background technology, there are still certain deficiencies in the prior art in terms of hydraulic oil return: for example, the natural oil return method is prone to oil return problems, resulting in oil leakage; the compressed air assisted oil return method is complex and increases production costs. To this end, the present application provides a vacuum oil return auxiliary device, which can at least solve the problem that the oil return auxiliary device required by the hydraulic oil in the oil return process in the prior art is relatively complex and costly. The vacuum oil return auxiliary device of the present application will be described in detail below in conjunction with the accompanying drawings.

[0031] like Figures 1 to 5 As shown, according to an embodiment of the present application, a vacuum oil return auxiliary device is provided, which is used to return the oil in the oil return channel (not shown in the figure) to a predetermined oil tank 70. The vacuum oil return auxiliary device includes: an oil storage container 10 and a vacuum generator 30.

[0032] In this embodiment, the oil storage container 10 includes an oil inlet 101 and an oil outlet 102, the oil inlet 101 is connected to the oil return channel, and the oil outlet 102 is connected to the oil tank 70 through the opening and closing valve 20; the vacuum generator 30 includes an air inlet 31, an exhaust port and a connecting port 32, the air inlet 31 is connected to the pressure source, the exhaust port is connected to the external environment, and the connecting port 32 is connected to the top of the oil storage container 10 through a pipeline.

[0033] In actual operation, the oil inlet 101 of the oil storage container 10 is connected to the oil return channel, and the oil storage container 10 also includes an oil outlet 102, which is connected to the oil tank 70 through the opening and closing valve 20. A vacuum generator 30 is arranged on one side of the oil storage container 10. The vacuum generator 30 includes an air inlet 31, an exhaust port (not shown in the figure) and a connection port 32, wherein the air inlet 31 is connected to the pressure gas source 40, the exhaust port is connected to the external environment, and the connection port 32 is connected to the top of the oil storage container 10 through a pipeline. In this way, a closed space is formed in the oil storage container 10 through the connection of the pipeline. When the vacuum generator 30 is started, the inside of the oil storage container 10 is evacuated to form a vacuum environment, and the oil in the oil return pipeline is easier to enter the oil storage container 10 due to the effect of the external pressure. When the amount of oil in the oil storage container 10 reaches a predetermined amount, the opening and closing valve 20 will be opened immediately, which is more suitable for the oil to flow back to the oil tank 70. In addition, by reasonably setting the connection position with the vacuum generator 30 on the oil storage container 10, the small amount of oil in the oil storage container 10 will not enter the vacuum generator 30 during the vacuum process; at the same time, an opening and closing valve 20 is provided at the oil outlet 102 of the oil storage container 10, so that the oil in the oil tank 70 will not be pumped into the oil storage container 10 during the vacuum process.

[0034] That is to say, this embodiment can realize smooth oil return by adding a vacuum oil return auxiliary device on the basis of natural oil return, and has low requirements on the capacity design of the oil storage container 10. In addition, the vacuum oil return auxiliary device in this embodiment does not cause the problem of oil mixing with air and rapid oil loss, and does not need to set up a separate oil-gas separation device, which simplifies the device structure and further reduces the production cost.

[0035] like Figure 1 , Figure 2 , Figure 4 as well as Figure 5 As shown, in this embodiment, the on-off valve 20 is arranged at the bottom of the oil storage container 10. Specifically, the on-off valve 20 is connected to the oil storage container 10 by threaded fitting, which makes it easy to install and remove the on-off valve 20, and the threaded fitting increases the airtightness between the on-off valve 20 and the oil storage container 10, preventing oil leakage. In this embodiment, an oil outlet 102 is arranged at the bottom of the oil storage container 10, and the on-off valve 20 is connected to the oil outlet 102, which is conducive to discharging the oil in the oil storage container 10 into the oil tank 70. In addition, the bottom surface of the oil storage container 10 has an inclined surface 111 inclined toward the oil outlet 102, which is more conducive to the discharge of oil into the oil tank 70.

[0036] Further, the opening and closing valve 20 includes a one-way valve. In this embodiment, the opening and closing valve 20 is set as a one-way valve, and the one-way valve can separate the air in the oil storage container 10 and the oil tank 70. When the oil storage container 10 is evacuated, due to the effect of the one-way valve, the air in the oil tank 70 will not enter the oil storage container 10, and the vacuum environment in the oil storage container 10 will not be destroyed.

[0037] like Figures 1 to 5As shown, the air inlet 31 of the vacuum generator 30 is connected to the pressure gas source 40 through the first pipeline 33, and the first pipeline 33 is provided with a solenoid valve 41. Exemplarily, the pressure gas source 40 of the vacuum generator 30 can be a compressed air system, nitrogen or a nitrogen generator, etc. The pressure gas source 40 is connected to the vacuum generator 30 through the first pipeline 33. When the pressure gas source 40 passes through the narrow nozzle in the vacuum generator 30, the speed increases and the pressure decreases, thereby forming a low-pressure area near the nozzle outlet, and then the air in the oil storage container 10 connected to the vacuum generator 30 can be sucked to form a vacuum environment inside the oil storage container 10. A solenoid valve 41 is provided on the first pipeline 33 to control the start or stop of the vacuum generator 30. In this embodiment, the solenoid valve 41 is a two-position two-way solenoid reversing valve, which has the advantages of fast response speed, high reliability, simple structure, and energy saving. It is used to control the start and stop of the vacuum generator 30, which can achieve precise control, fast response, extended service life of the vacuum generator 30, reduced maintenance requirements, etc. In the actual working process, according to actual needs, the vacuum generator 30 can be continuously operated by controlling the solenoid valve 41, and intermittent suction can be achieved by controlling the on and off of the solenoid valve 41, thereby achieving the effect of auxiliary oil return.

[0038] like Figures 1 to 4 As shown, the oil storage container 10 includes a body 11, a cover plate 12 and a sealing gasket 13. The body 11 is provided with a receiving cavity (not shown in the figure) for receiving oil and an opening (not shown in the figure) communicating with the receiving cavity, and the cover plate 12 is fixed to the body 11 by screws 14 to cover the opening, and the sealing gasket 13 is arranged between the cover plate 12 and the body 11. Specifically, the sealing gasket 13 and the cover plate 12 are fixed to the body 11 by hexagonal cylindrical head screws, so that a closed environment is formed, which is conducive to vacuuming and realizing smooth oil return.

[0039] Furthermore, a joint 121 is provided on the cover plate 12, and the joint 121 penetrates the cover plate 12 and communicates with the cavity, and the joint 121 is connected to the connection port 32 on the vacuum generator 30 through the second pipeline 53. When the vacuum generator 30 is started, the second pipeline 53 connected to the connection port 32 on the vacuum generator 30 communicates with the joint 121 on the cover plate 12, and the air in the oil storage container 10 is extracted, and a vacuum environment is formed inside the oil storage container 10, so that the oil can flow smoothly into the oil storage container 10 for temporary storage. In addition, the joint 121 is provided on the cover plate 12, and when vacuuming, the oil is prevented from entering the vacuum generator 30 through the second pipeline 53, which affects the normal operation of the vacuum generator 30.

[0040] like Figures 1 to 5As shown, the vacuum oil return auxiliary device also includes a filter 50, which is used to filter moisture and other particles in the air extracted from the oil storage container 10 to protect the vacuum generator 30, reduce the impact of moisture, particles, etc. on the performance of the vacuum generator 30, and avoid failure of the vacuum generator 30; it is also beneficial to maintain a stable vacuum degree inside the oil storage container 10; it is also beneficial to maintain air quality. The filter 50 includes a first interface 51 and a second interface 52. The first interface 51 is connected to the connection port 32 of the vacuum generator 30 through a pipeline, and the second interface 52 is connected to the joint 121 set on the top of the oil storage container 10 through a pipeline. The air in the oil storage container 10 enters the vacuum generator 30 after being filtered by the filter 50 and is discharged through the exhaust port. As shown Figure 5 As shown, a muffler 80 is also provided on the exhaust port of the vacuum generator 30 to reduce the noise generated when the air is discharged.

[0041] like Figure 4 As shown, a mounting plate 60 is provided at the bottom of the oil storage container 10, the vacuum generator 30 is fixedly mounted on the mounting plate 60 by screws 14, and the filter 50 is arranged on one side of the vacuum generator 30. In this embodiment, the oil storage container 10 and the vacuum generator 30 are simultaneously mounted on the mounting plate 60, integrated into a whole, and the space occupied is reduced. The filter 50 is arranged close to the vacuum generator 30, which reduces the length of the connected pipeline and reduces the production cost.

[0042] Further, the opening pressure F of the opening and closing valve 20, the weight W in the oil storage container 10, and the cross-sectional area S of the pipeline provided between the oil storage container 10 and the opening and closing valve 20 satisfy the relationship: W=FS. In this embodiment, an opening and closing valve 20 is provided at the bottom of the oil storage container 10 and is connected to the oil outlet 102 of the oil storage container 10. When the opening pressure F of the opening and closing valve 20, the weight W of the oil in the oil storage container 10, and the cross-sectional area S of the pipeline provided between the oil storage container 10 and the opening and closing valve 20 satisfy the relationship: W=FS, the oil in the oil storage container 10 can automatically flow into the oil tank 70. Compared with the prior art, automation is achieved and manual operation is reduced. Specifically, the opening pressure F of the opening and closing valve 20 can be determined according to the selection of the opening and closing valve 20, and then the amount of oil in the oil storage container 10 can be determined by the cross-sectional area S of the pipeline connected to the opening and closing valve 20, thereby realizing automatic opening of the opening and closing valve 20. For example, assuming that the opening pressure of the on-off valve 20 is 0.05 MPa, and the diameter of the oil return pipeline is 25 mm, the weight W of the oil in the oil storage container 10 is 24.5 N (i.e., 24.5 Newtons), then the on-off valve 20 can be automatically opened, and the oil in the oil storage container 10 enters the oil tank 70. In other embodiments of the present application, the opening pressure of the on-off valve 20 can also be selected to be small, so that the oil inlet rate and the oil outlet rate can be equal to each other to a certain extent, and the amount of oil stored in the oil storage container 10 is very small, so that when vacuuming, no oil will enter the vacuum generator 30, ensuring the stable operation of the vacuum oil return auxiliary device.

[0043] Furthermore, when the on-off valve 20 is opened, the volume V1 of the oil in the oil storage container 10 and the volume V2 of the oil storage container 10 satisfy the relationship: V1≤V2 / 5. The amount of oil in the oil storage container 10 can be determined according to the opening pressure of the on-off valve 20. At this time, the volume V1 of the oil in the oil storage container 10 does not exceed the volume V2 / 5 of the oil storage container 10. For example, when the volume of the oil storage container 10 is 1m 3 When the volume of oil in the oil storage container 10 does not exceed 0.2m 2 Such an arrangement can ensure the safety of the vacuum oil return auxiliary device, prevent excessive oil storage in the oil storage container 10, and maintain an appropriate vacuum degree to facilitate smooth oil return.

[0044] In summary, the present application integrates the oil storage container 10 and the vacuum generator 30 into a whole by simultaneously setting the oil storage container 10 and the vacuum generator 30 on the mounting plate 60, thereby reducing the space occupied and facilitating the connection between the devices; and a filter 50 is set on one side of the vacuum generator 30, and the first interface 51 of the filter 50 is connected to the vacuum generator 30; and the second interface 52 is connected to the joint 121 at the top of the oil storage container 10. When the vacuum generator 30 is working, the moisture and particulate matter in the air from the oil storage container 10 are filtered to reduce the impact on the vacuum generator 30. In addition, a one-way valve is also set at the bottom of the oil storage container 10 to prevent the air in the oil storage container 10 from affecting the vacuum environment in the oil storage container 10. When the weight of the oil in the oil storage container 10 reaches a predetermined value, the one-way valve will automatically open to discharge the oil into the oil tank 70 without manual operation.

[0045] The present application can realize smooth oil return by adding a vacuum oil return auxiliary device on the basis of natural oil return. Not only is the capacity of the oil storage container 10 designed to be small, but also overcomes the shortcomings of using compressed air for oil return, and no longer causes the problem of oil mixing with air and rapid oil loss. There is no need to add an additional oil-gas separation device, etc., and the vacuum generator 30 will basically not be damaged, reducing production costs. In addition, the vacuum oil return auxiliary device of the present application has a simple structure, is easy to realize oil return and has high reliability, and can be widely used in auxiliary oil return of liquid static pressure functional components, or other similar oil return occasions.

[0046] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0047] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vacuum oil return auxiliary device, the vacuum oil return auxiliary device is used to return the oil in the oil return channel to a predetermined oil tank (70), characterized in that: include: An oil storage container (10), the oil storage container (10) comprising an oil inlet (101) and an oil outlet (102), the oil inlet (101) being connected to the oil return passage, and the oil outlet (102) being connected to the oil tank (70) via an on-off valve (20); A vacuum generator (30), the vacuum generator (30) comprising an air inlet (31), an air outlet and a connecting port (32), the air inlet (31) being connected to a pressure air source (40), the air outlet being connected to an external environment, and the connecting port (32) being connected to the top of the oil storage container (10) via a pipeline.

2. The vacuum oil return auxiliary device according to claim 1, characterized in that: The on-off valve (20) is arranged at the bottom of the oil storage container (10), the on-off valve (20) and the oil storage container (10) are connected by threaded cooperation, and an oil outlet (102) is arranged at the bottom of the oil storage container (10), the on-off valve (20) is communicated with the oil outlet (102), and the bottom surface of the oil storage container (10) has an inclined surface (111) inclined toward the oil outlet (102).

3. The vacuum oil return auxiliary device according to claim 1, characterized in that: The on-off valve (20) includes a one-way valve.

4. The vacuum oil return auxiliary device according to claim 1, characterized in that: The air inlet (31) of the vacuum generator (30) is connected to the pressure air source (40) via a first pipeline (33), and a solenoid valve (41) is provided on the first pipeline (33).

5. The vacuum oil return auxiliary device according to claim 1, characterized in that: The oil storage container (10) comprises a body (11), a cover plate (12) and a sealing gasket (13); the body (11) is provided with a receiving cavity for receiving oil and an opening communicating with the receiving cavity; the cover plate (12) is fixed to the body (11) by screws (14) to cover the opening; and the sealing gasket (13) is arranged between the cover plate (12) and the body (11).

6. The vacuum oil return auxiliary device according to claim 5, characterized in that: A joint (121) is provided on the cover plate (12), the joint (121) passes through the cover plate (12) and is in communication with the cavity, and the joint (121) is connected to the connection port (32) on the vacuum generator (30) via a second pipeline (53).

7. The vacuum oil return auxiliary device according to claim 1, characterized in that: The vacuum oil return auxiliary device also includes a filter (50), the filter (50) including a first interface (51) and a second interface (52), the first interface (51) being connected to the connecting port (32) of the vacuum generator (30) via a pipeline, and the second interface (52) being connected to a joint (121) provided at the top of the oil storage container (10) via a pipeline, and the air in the oil storage container (10) is filtered by the filter (50) and then enters the vacuum generator (30) and is discharged through the exhaust port.

8. The vacuum oil return auxiliary device according to claim 7, characterized in that: A mounting plate (60) is provided at the bottom of the oil storage container (10), the vacuum generator (30) is fixedly mounted on the mounting plate (60) by means of screws (14), and the filter (50) is arranged on one side of the vacuum generator (30).

9. The vacuum oil return auxiliary device according to any one of claims 1 to 8, characterized in that: The opening pressure F of the on-off valve (20), the weight W of the oil in the oil storage container (10), and the cross-sectional area S of the pipe provided between the oil storage container (10) and the on-off valve (20) satisfy the relationship: W=FS.

10. The vacuum oil return auxiliary device according to any one of claims 1 to 8, characterized in that: When the on-off valve (20) is opened, the volume V1 of the oil in the oil storage container (10) and the volume V2 of the oil storage container (10) satisfy the relationship: V1≤V2 / 5.

Images