Vacuum pump capable of preventing oil leakage

Abstract

The utility model discloses an oil leakage prevention vacuum pump which comprises a pump body assembly and a motor, and the pump body assembly comprises a pump shell, a rotor and a main shaft; the pump shell is provided with a pump cavity and a shaft hole communicated with the pump cavity; the rotor is rotationally mounted in the pump cavity; one end of the main shaft is fixedly connected to the rotor, and the other end of the main shaft is connected with the motor through the shaft hole; the pump body assembly further comprises an oil seal and a sealing seat, and the oil seal is arranged on the outer side of the main shaft in a sleeving mode and located on the outer side of the pump shell so as to be used for sealing a gap between the pump shell and the main shaft. The sealing seat comprises a fixing part and a blocking part, the fixing part is fixed to the pump shell, and the blocking part is used for blocking the oil seal from moving in the direction opposite to the rotor so that the oil seal can be tightly attached to the pump shell; compared with the prior art, the scheme effectively solves the problem of oil leakage in the vacuum pump by adding the oil seal and the sealing seat structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vacuum pumps, in particular to an oil leakage-proof vacuum pump. BACKGROUND

[0002] Vacuum pumps are widely used in many industrial fields and scientific experiments. Their role is to create a low-pressure environment by extracting gas to meet the needs of various processes and experiments.

[0003] A vacuum pump mainly consists of a motor, a main shaft, a rotor, and a housing. The motor serves as the power source, providing stable driving force. The main shaft acts as a transmission component, transmitting the rotational power of the motor to the rotor. The rotor forms a rotating motion in the pump cavity, effectively extracting gas. The housing serves as a protective component, enclosing and fixing the internal components while ensuring good sealing and heat dissipation. These components work together to achieve efficient and stable operation of the vacuum pump, providing a solid foundation for various vacuum applications.

[0004] However, during long-term operation, there are often small gaps between the pump housing and the main shaft in the pump assembly. These gaps may cause lubricating oil to leak during long-term operation, affecting the efficiency of the vacuum pump and potentially causing environmental pollution.

[0005] In view of this, it is necessary to propose a new technical solution to overcome the shortcomings in the prior art. CONTENT OF THE INVENTION

[0006] To solve the above problems, the present application provides an oil leakage-proof vacuum pump, which can solve the problem of oil leakage of the vacuum pump.

[0007] The present application provides an oil leakage-proof vacuum pump, comprising a pump assembly and a motor, wherein the pump assembly comprises:

[0008] a pump housing having a pump cavity and a shaft hole communicating with the pump cavity;

[0009] a rotor rotatably installed in the pump cavity; and

[0010] a main shaft having one end fixedly connected to the rotor and the other end connected to the motor through the shaft hole;

[0011] The pump assembly further comprises:

[0012] an oil seal sleeved on the outside of the main shaft and located on the outside of the pump housing to seal the gap between the pump housing and the main shaft; and

[0013] A sealing seat comprises a fixed part fixed to the pump housing and a blocking part for blocking the oil seal from moving back to the rotor direction to make the oil seal tightly fit the pump housing.

[0014] The following also provides several optional modes, but not as an additional limitation to the above general scheme, just a further supplement or preferred, without technical or logical contradiction, each optional mode can be combined alone for the above general scheme, but also can be combined between multiple optional modes.

[0015] Optionally, the oil seal comprises:

[0016] A main body part fixed between the blocking part and the pump housing; and

[0017] An elastic abutting part integrally provided on the main body part and located between the main body part and the main shaft to elastically abut the outside of the main shaft.

[0018] Optionally, a first sealing gasket is provided between the fixed part and the pump housing.

[0019] Optionally, the fixed part is fixed to the pump housing by a screw.

[0020] Optionally, the sealing seat and the pump housing and the main shaft form an installation groove for installing the oil seal.

[0021] Optionally, a shaft sleeve is provided between the main shaft and the shaft hole, and the elastic abutting part elastically abuts the outside of the shaft sleeve.

[0022] Optionally, the pump housing further has a limiting step, and the sealing seat further comprises a limiting part matched with the limiting step.

[0023] Optionally, the limiting step is circumferentially arranged around the main shaft, and the limiting part is located on the side of the fixed part away from the main shaft.

[0024] Optionally, the pump housing comprises:

[0025] A main housing having an opening on the side facing the motor;

[0026] A first support fixed to the opening of the main housing and having an installation hole; and

[0027] A second support with part of the structure extending into the installation hole, and the shaft hole is formed in the second support.

[0028] The end of the part of the second support extending into the installation hole forms the limiting step.

[0029] Optionally, the first support and the second support have an oil storage cavity therebetween, and second sealing pads and a sealing ring are arranged on two sides of the oil storage cavity.

[0030] The oil leakage problem in the vacuum pump is effectively solved by adding an oil seal and a sealing seat and the like structure. Meanwhile, by optimizing the cooperation and connection mode between various components, the overall performance and reliability of the pump body are further improved. This design not only has simple structure and low cost, but also shows good oil leakage prevention effect in actual application, and has high practical value. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 An embodiment of the oil leakage prevention vacuum pump provided in the application is a structure schematic view of the oil leakage prevention vacuum pump;

[0032] Figure 2 For Figure 1 A cross-sectional view of the vacuum pump;

[0033] Figure 3 For Figure 2 An exploded structure schematic view of the vacuum pump;

[0034] Figure 4 For Figure 2 An enlarged structure schematic view of A part of the vacuum pump.

[0035] The reference signs in the drawings are explained as follows:

[0036] 100, vacuum pump;

[0037] 10, pump body assembly; 11, pump shell; 111, pump cavity; 112, shaft hole; 113, main shell; 114, first support; 115, second support; 116, oil storage cavity; 117, second sealing pad; 118, sealing ring; 12, rotor; 13, main shaft; 14, shaft sleeve; 15, limiting step;

[0038] 20, motor;

[0039] 30, oil seal; 31, main body part; 32, elastic abutting part;

[0040] 40, sealing seat; 41, fixed part; 42, blocking part; 43, first sealing gasket; 44, mounting groove; 45, limiting part. DETAILED DESCRIPTION

[0041] With reference to the drawings and the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative effort belong to the scope of the present application.

[0042] It should be noted that when a component is referred to as being "connected" with another component, it can be directly connected with the other component or there can be a middle component. When a component is referred to as being "disposed on" another component, it can be directly disposed on the other component or there can be a middle component.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0044] As shown in Figures 1 to 4 The present application provides an oil leakage prevention vacuum pump 100, which comprises a pump assembly 10 and a motor 20. The pump assembly 10 comprises a pump shell 11, a rotor 12 and a main shaft 13. The pump shell 11 has a pump cavity 111 and a shaft hole 112 communicating with the pump cavity 111. The rotor 12 is rotatably installed in the pump cavity 111. One end of the main shaft 13 is fixedly connected to the rotor 12, and the other end is connected to the motor 20 through the shaft hole 112. The motor 20 drives the rotor 12 to rotate through the main shaft 13, so as to realize the function of the vacuum pump 100.

[0045] One end of the main shaft 13 is located outside the pump shell 11 and connected to the motor 20, and the other end extends into the pump shell 11 through the shaft hole 112 and is connected to the rotor 12. The main shaft 13 is rotatably connected to the pump shell 11, and there is a gap between the main shaft 13 and the inner wall of the shaft hole 112. When the vacuum pump 100 is working, lubricating oil in the pump cavity 111 may seep out along the gap between the main shaft 13 and the pump shell 11, especially when the main shaft 13 rotates at high speed and the internal pressure of the pump body changes, the oil leakage phenomenon is more obvious. In order to solve this technical problem, referring to one of the embodiments, as shown in Figures 2 to 4 The pump assembly 10 further comprises an oil seal 30, which is sleeved on the outer side of the main shaft 13 and located outside the pump shell 11, so as to seal the gap between the pump shell 11 and the main shaft 13. The arrangement of the oil seal 30 achieves high-efficiency and reliable oil leakage prevention effect, improves the stability and service life of the equipment, and reduces the maintenance cost and environmental pollution.

[0046] In the embodiment, as shown in Figures 2 to 4 The oil seal 30 includes a main body portion 31 fixed between the blocking portion 42 and the pump shell 11, and an elastic abutting portion 32 integrally provided on the main body portion 31 and located between the main body portion 31 and the main shaft 13 to elastically abut against the outside of the main shaft 13. The main body portion 31 and the elastic abutting portion 32 are configured to allow the oil seal 30 to better adapt to the rotation and slight displacement of the main shaft 13, and to always maintain close contact with the main shaft 13 through the elastic action of the elastic abutting portion 32, thereby effectively preventing lubricating oil from leaking from the gap between the main shaft 13 and the pump shell 11.

[0047] In the embodiment, as shown in Figures 2 to 4 The pump shell 11 is an important component of the entire pump assembly 10 and provides space and support for the installation of the rotor 12 and the main shaft 13. Specifically, the pump shell 11 includes a main shell 113, a first bracket 114, and a second bracket 115. The main shell 113 has an opening on the side facing the motor 20, the first bracket 114 is fixed to the opening of the main shell 113 and has a mounting hole, the second bracket 115 partially extends into the mounting hole, and the shaft hole 112 is formed in the second bracket 115. Such a structural design facilitates the assembly of the pump assembly 10 and the positioning of the components, and also provides a basis for the subsequent sealing structure. In order to store lubricating oil and prevent its leakage, an oil storage cavity 116 is provided between the first bracket 114 and the second bracket 115, and second sealing pads 117 and a sealing ring 118 are provided on both sides of the oil storage cavity 116. When the lubricating oil in the pump cavity 111 enters the oil storage cavity 116 between the first bracket 114 and the second bracket 115, the oil storage cavity 116 can limit the further outward flow of the lubricating oil.

[0048] In order to further improve the sealing performance and reduce the friction between the main shaft 13 and the shaft hole 112, in one embodiment, as shown in Figures 2 to 4 A shaft sleeve 14 is provided between the main shaft 13 and the shaft hole 112. The presence of the shaft sleeve 14 not only reduces the friction between the main shaft 13 and the shaft hole 112, prolonging the service life of the main shaft 13 and the pump shell 11, but also blocks the lubricating oil to some extent, preventing it from leaking directly from the shaft hole 112. The shaft sleeve 14 is fixed on the main shaft 13 and can rotate with the main shaft 13, so that the shaft sleeve 14 rotates in the shaft hole 112. The elastic abutting portion 32 elastically abuts against the outside of the shaft sleeve 14.

[0049] In the embodiment, as shown in Figures 2 to 4As shown, the pump body assembly 10 further comprises a sealing seat 40, which comprises a fixed part 41 fixed to the pump shell 11 and a blocking part 42 for blocking the oil seal 30 from moving away from the rotor 12 to ensure that the oil seal 30 is tightly attached to the pump shell 11. The fixed part 41 is fixed to the pump shell 11 by screws, which is simple and reliable, and facilitates installation and disassembly. A first sealing gasket 43 is further arranged between the fixed part 41 and the pump shell 11 to further enhance the sealing performance between the sealing seat 40 and the pump shell 11, preventing lubricating oil from leaking from the connection between the sealing seat 40 and the pump shell 11. The blocking part 42 is used to block the oil seal 30 from moving away from the rotor 12 to ensure that the oil seal 30 is tightly attached to the pump shell 11. In addition, the sealing seat 40, the pump shell 11 and the main shaft 13 further surround an installation groove 44 for installing the oil seal 30. The design of the installation groove 44 enables the oil seal 30 to be stably installed at a predetermined position and to maintain a good sealing state under the action of the sealing seat 40.

[0050] In the present embodiment, as shown in Figures 2 to 4 The pump shell 11 further comprises a limiting step 15, and the sealing seat 40 further comprises a limiting part 45 cooperating with the limiting step 15 to ensure accurate installation and positioning of the sealing seat 40. The limiting step 15 is circumferentially arranged around the main shaft, and the limiting part 45 is located on the side of the fixed part 41 away from the main shaft 13. This limiting structure can effectively prevent the sealing seat 40 from shifting during operation, ensuring that the oil seal 30 is always in the correct working position and further improving the reliability of the seal. Specifically, the end portion of the portion of the second bracket 115 extending into the installation hole forms the limiting step 15, which enables the limiting structure to be more closely integrated with the overall structure of the pump body assembly 10.

[0051] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present disclosure. When the technical features in different embodiments are embodied in the same figure, it is considered that the figure also discloses the combination of the embodiments involved.

[0052] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application.

Claims

1. An oil leakage-proof vacuum pump, comprising a pump body assembly and a motor, the pump body assembly comprising: a pump shell having a pump cavity and a shaft hole communicating with the pump cavity; a rotor rotatably installed in the pump cavity; and a main shaft having one end fixed to the rotor and the other end connected to the motor through the shaft hole; characterized in that the pump body assembly further comprises: an oil seal sleeved on the outside of the main shaft and located on the outside of the pump shell for sealing the gap between the pump shell and the main shaft; and a sealing seat comprising a fixed part fixed to the pump shell and a blocking part for blocking the oil seal from moving back to the rotor direction so as to make the oil seal tightly contact with the pump shell. The oil seal comprises: a main body part fixed between the blocking part and the pump shell; and an elastic abutting part integrally arranged on the main body part and located between the main body part and the main shaft for elastically abutting to the outside of the main shaft. A first sealing gasket is arranged between the fixed part and the pump shell. The fixed part is fixed to the pump shell by a screw. The sealing seat, the pump shell and the main shaft form an installation groove for installing the oil seal. A shaft sleeve is arranged between the main shaft and the shaft hole, and the elastic abutting part elastically abuts to the outside of the shaft sleeve. The pump shell further has a limiting step, and the sealing seat further comprises a limiting part matched with the limiting step. The limiting step is circumferentially arranged around the main shaft, and the limiting part is located on the side of the fixed part away from the main shaft.

2. An oil-tight vacuum pump according to claim 1, characterized in that The pump shell comprises: a main shell having an opening on the side facing the motor; a first support fixed to the opening of the main shell and having an installation hole; and a second support having a part of structure extending into the installation hole, and the shaft hole is arranged in the second support; The end of the part of the second support extending into the installation hole forms the limiting step. The first support and the second support have an oil storage cavity, and the two sides of the oil storage cavity are provided with a second sealing gasket and a sealing ring.

3. An oil-tight vacuum pump according to claim 1 or 2, characterized in that ​ 4. An oil-tight vacuum pump according to claim 3, characterized in that ​ 5. An oil-tight vacuum pump according to claim 1, characterized in that ​ 6. An oil-tight vacuum pump according to claim 2, characterized in that ​ 7. An oil-tight vacuum pump according to claim 1, characterized in that ​ 8. An oil-tight vacuum pump according to claim 7, characterized in that ​ 9. An oil-tight vacuum pump according to claim 8, characterized in that ​ ​ ​ ​ ​ 10. An oil-tight vacuum pump according to claim 9, characterized in that ​

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