Leak-proof mechanical sealing type roots vacuum pump
By adopting a double seal structure and cooling chamber design in the Roots vacuum pump, the leakage problem caused by shaft seal wear is solved, the sealing effect and service life are improved, and the efficient operation of the vacuum pump is ensured.
Patent Information
- Application Number
- CN202421755279.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-23
AI Technical Summary
When the existing Roots vacuum pump is running at high speed, the friction between the shaft seal and the spindle causes wear, which poses a potential leakage risk, resulting in a degradation of sealing performance and a decrease in vacuum performance, affecting the service life of the equipment.
A mechanically sealed Roots vacuum pump that is anti-leakage is designed, adopting a double sealing structure, which generates a liquid film seal through the relative motion friction between the moving ring and the static ring, and a cooling chamber is set up at the mechanical sealing part to cool down and improve the sealing effect.
The double sealing structure in the mechanical sealing parts is realized, which improves the sealing effect and service life, while avoiding leakage problems and ensuring efficient operation of the vacuum pump.
Smart Images
Figure CN222863610U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of vacuum pumps, in particular to a leakage-proof mechanical seal Roots vacuum pump. Background Art
[0002] Roots vacuum pumps, high-pressure fans, reducers and other engineering equipment are widely used in metallurgy, chemical industry, power generation, environmental protection, construction and other fields.
[0003] In the prior art, due to the negative pressure inside the vacuum pump, shaft seals are provided between the pump body and the front rotor main shaft to prevent liquid leakage in the vacuum pump body; however, as the vacuum pump runs at high speed, the main shaft of the front rotor constantly rubs against the shaft seal. After long-term use, the contact between the shaft seal and the main shaft will be worn, and there is a risk of vacuum oil in the pump leaking at the shaft seal, resulting in a decrease in the sealing performance of the vacuum pump and a decrease in the vacuum performance, which in turn affects the service life of the equipment. Utility Model Content
[0004] In view of the deficiencies of the prior art, the utility model provides a leakage-proof mechanical seal Roots vacuum pump, which solves the technical problems raised in the above-mentioned background technology.
[0005] To achieve the above objectives, the utility model is implemented through the following technical solutions: a leak-proof mechanical seal Roots vacuum pump, comprising a drive motor, a drive chamber and a vacuum pump body, the drive end of the drive motor is connected to the drive chamber, the drive chamber is connected to the vacuum pump body, a fixed plate and a clamping plate are arranged at the connection in the drive chamber, a clamping plate sealing pad is arranged between the fixed plate and the clamping plate, the fixed plate and the clamping plate are sealed and fixedly connected, a cooling cavity is arranged in the fixed plate and the clamping plate, a drive shaft is connected through the fixed plate and the clamping plate, and the drive shaft and the cooling cavity are fixedly arranged A transmission shaft ring is installed, and springs are fixedly connected on both sides of the transmission shaft ring. Dynamic rings are installed on both sides of the transmission shaft ring. The end of the spring is connected to the dynamic ring with a thrust ring. A dynamic ring sealing ring is installed between the thrust ring and the inner wall of the dynamic ring. A limiting groove matching the transmission shaft ring is provided on the outer wall of the dynamic ring. A first static ring in close contact with the dynamic ring is fixedly installed in the clamping plate, a first static ring gasket is installed between the first static ring and the clamping plate, a second static ring in close contact with the dynamic ring is fixedly installed in the fixed plate, and a second static ring gasket is installed between the second static ring and the fixed plate.
[0006] Preferably, lubricating liquid is provided between the contact surfaces of the dynamic ring and the first stationary ring and the second stationary ring.
[0007] Preferably, the cooling cavity may be filled with a cooling medium.
[0008] Preferably, the spring is in a compressed state.
[0009] Preferably, the transmission shaft ring cooperates with the limiting groove, and the transmission shaft ring drives a pair of the movable rings to rotate.
[0010] Beneficial Effects
[0011] The utility model provides a leakage-proof mechanical seal type Roots vacuum pump, which has the following beneficial effects: when the device is in use, a double sealing structure is arranged at the mechanical seal part, and a sealing effect is achieved by a liquid film generated by the relative movement friction between a dynamic ring and a first static ring and a second static ring, and at the same time a cooling chamber is arranged at the mechanical seal part, which can cool the friction surface, thereby improving the sealing effect and increasing the service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 The utility model is a structural diagram of a mechanical seal of a leak-proof mechanical seal Roots vacuum pump.
[0013] Figure 2 The utility model is a schematic structural diagram of a leakage-proof mechanical seal Roots vacuum pump.
[0014] In the figure: 1. fixed plate; 2. clamping plate; 3. clamping plate sealing gasket; 4. cooling chamber; 5. driving shaft; 6. first static ring; 7. first static ring gasket; 8. transmission shaft ring; 9. spring; 10. thrust ring; 11. dynamic ring sealing ring; 12. dynamic ring; 13. limiting groove; 14. second static ring; 15. second static ring gasket; 16. driving motor; 17. driving chamber; 18. vacuum pump body. DETAILED DESCRIPTION
[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the implementation regulations described are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0016] See also Figure 1-2The utility model provides a technical solution for a leak-proof mechanical seal Roots vacuum pump: a leak-proof mechanical seal Roots vacuum pump, comprising a drive motor 16, a drive chamber 17 and a vacuum pump body 18, wherein the drive end of the drive motor 16 is connected to the drive chamber 17, the drive chamber 17 is connected to the vacuum pump body 18, a fixed plate 1 and a clamping plate 2 are arranged at the connection in the drive chamber 17, a clamping plate sealing pad 3 is arranged between the fixed plate 1 and the clamping plate 2, the fixed plate 1 and the clamping plate 2 are sealed and fixedly connected, a cooling cavity 4 is arranged in the fixed plate 1 and the clamping plate 2, a drive shaft 5 is connected through the fixed plate 1 and the clamping plate 2, and the drive shaft 5 is fixedly installed in the cooling cavity 4 There is a transmission shaft ring 8, springs 9 are fixedly connected on both sides of the transmission shaft ring 8, dynamic rings 12 are installed on both sides of the transmission shaft ring 8, the end of the spring 9 is connected to the dynamic ring 12 with a thrust ring 10, a dynamic ring sealing ring 11 is installed between the thrust ring 10 and the inner wall of the dynamic ring 12, and a limiting groove 13 matching the transmission shaft ring 8 is provided on the outer wall of the dynamic ring 12, a first static ring 6 in close contact with the dynamic ring 12 is fixedly installed in the clamping plate 2, a first static ring gasket 7 is installed between the first static ring 6 and the clamping plate 2, a second static ring 14 in close contact with the dynamic ring 12 is fixedly installed in the fixed plate 1, and a second static ring gasket 15 is installed between the second static ring 14 and the fixed plate 1.
[0017] Furthermore, lubricating liquid is provided between the contact surfaces of the dynamic ring 12 and the first stationary ring 6 and the second stationary ring 14 .
[0018] Furthermore, the cooling cavity 4 may be filled with a cooling medium.
[0019] Furthermore, the spring 9 is in a compressed state.
[0020] Furthermore, the transmission shaft ring 8 cooperates with the limiting groove 13 , and the transmission shaft ring 8 drives a pair of movable rings 12 to rotate.
[0021] Embodiment: When the device is in use, the driving end of the driving motor 16 is connected to the driving shaft 5, and the driving motor 16 drives a pair of meshing gears in the driving chamber 17 to drive the impeller in the vacuum pump body 18 to rotate to realize the use of the Roots vacuum pump.
[0022] A mechanical seal is provided between the driving chamber 17 and the vacuum pump body 18 to prevent the pumped medium in the pump chamber from leaking to both ends of the pump chamber and contaminating the vacuum pump oil in the oil tank.
[0023] When in use, the direction of the fixed plate 1 is one end in the direction of the pumped medium. Since the transmission shaft ring 8 is fixedly installed on the driving shaft 5, when the driving shaft 5 rotates, the transmission shaft ring 8 and the parts on the transmission shaft ring 8 are driven to rotate together. The dynamic ring 12 connected by the limiting groove 13 on the transmission shaft ring 8 rotates together with the transmission shaft ring 8. The spring 9 is in a compressed state and will produce a certain reset elastic force to push the thrust ring 10 and the dynamic ring sealing ring 11, and further push the dynamic ring 12 to fit tightly with the second static ring 14 and the first static ring 6. Lubricating oil is provided between the dynamic ring 12 and the second static ring 14 and the first static ring 6. When the dynamic ring 12 rotates, a sealing oil film is formed to produce a sealing effect to prevent leakage of the pumped medium.
[0024] A first seal is formed between the dynamic ring 12 and the second static ring 14, and a second seal is formed between the dynamic ring 12 and the first static ring 6. The double sealing structure can further ensure the leakage of the pumped medium. At the same time, the cooling medium can be filled in the cooling cavity 4 to cool the friction surface, improve the sealing performance, and increase the service life.
[0025] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.
Claims
1. A leak-proof mechanical seal Roots vacuum pump, comprising a drive motor (16), a drive chamber (17) and a vacuum pump body (18), characterized in that: The driving end of the driving motor (16) is connected to the driving chamber (17), and the driving chamber (17) is connected to the vacuum pump body (18). A fixing plate (1) and a clamping plate (2) are provided at the connection point in the driving chamber (17). A clamping plate sealing pad layer (3) is provided between the fixing plate (1) and the clamping plate (2). The fixing plate (1) and the clamping plate (2) are sealed and fixedly connected. A cooling cavity (4) is provided in the fixing plate (1) and the clamping plate (2). A driving shaft (5) is connected through the fixing plate (1) and the clamping plate (2). A transmission shaft ring (8) is fixedly installed in the driving shaft (5) and the cooling cavity (4). Springs (9) are fixedly connected to both sides of the transmission shaft ring (8). The transmission shaft ring (8) ) are installed on both sides of the spring (9), the end of the spring (9) is connected to the inside of the dynamic ring (12) with a thrust ring (10), a dynamic ring sealing ring (11) is installed between the thrust ring (10) and the inner wall of the dynamic ring (12), the outer wall of the dynamic ring (12) is provided with a limit groove (13) matching the transmission shaft ring (8), a first static ring (6) in close contact with the dynamic ring (12) is fixedly installed in the clamping plate (2), a first static ring gasket (7) is installed between the first static ring (6) and the clamping plate (2), a second static ring (14) in close contact with the dynamic ring (12) is fixedly installed in the fixed plate (1), and a second static ring gasket (15) is installed between the second static ring (14) and the fixed plate (1).
2. A leak-proof mechanical seal Roots vacuum pump according to claim 1, characterized in that: Lubricating liquid is provided between the contact surfaces of the dynamic ring (12) and the first stationary ring (6) and the second stationary ring (14).
3. The leak-proof mechanical seal Roots vacuum pump according to claim 1, characterized in that: The cooling cavity (4) can be filled with a cooling medium.
4. The leak-proof mechanical seal Roots vacuum pump according to claim 1, characterized in that: The spring (9) is in a compressed state.
5. The leak-proof mechanical seal Roots vacuum pump according to claim 1, characterized in that: The transmission shaft ring (8) cooperates with the limiting groove (13), and the transmission shaft ring (8) drives a pair of movable rings (12) to rotate.