Mechanical seal for screw vacuum pump

Abstract

The utility model relates to the technical field of mechanical seals, and discloses a mechanical seal for a screw vacuum pump, which comprises a pump body and a pump shaft arranged in the pump body, a bearing is fixedly mounted on the outer side of the pump shaft, a stationary ring seat is fixedly mounted in the pump shaft, a first sealing ring is fixedly mounted on one side of the stationary ring seat, and a second sealing ring is fixedly mounted on the other side of the stationary ring seat. A spring is fixedly installed in the static ring seat, a push ring is arranged on the inner side of the static ring seat, a second sealing ring is fixedly installed on one side of the push ring, a static ring body is arranged on the other side of the second sealing ring, and a movable ring body is arranged on one side of the static ring body. According to the mechanical seal for the screw vacuum pump, due to the meticulous design of the engine oil flow channel, engine oil can smoothly reach the engine oil side through the engine oil flow channel, so that sufficient lubrication is provided for the bearing, friction and abrasion are reduced, and the service life of the bearing is prolonged. In addition, heat generated during operation of the bearing can be taken away through flowing of the engine oil, and performance reduction or damage caused by overheating of the bearing is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, in particular to a mechanical seal for a screw vacuum pump. Background Art

[0002] The screw vacuum pump is a type of dry vacuum pump. It consists of a pair of mutually meshing master and slave rotors that rotate synchronously and oppositely at high speed in a pump chamber composed of a pump body, an intake side middle wall, an exhaust side middle wall, etc., thereby playing the role of suction, compression and exhaust. It is a new type of vacuum pump that does not require any water, oil or other liquid as a working medium in the pump chamber during operation and can obtain a clean vacuum.

[0003] China Utility Model Announcement No.: CN 220850033 U3 discloses a mechanical seal structure for an oil-free screw vacuum pump. This structure inserts the card plate between the two arms of the U-shaped plate, inserts the two protruding rods into the two L-shaped slots, and then places the airbag between the connecting plate and the body. The shell can be quickly disassembled and assembled by opening and closing the airbag, which is convenient for users. However, the mechanical seal structure for the oil-free screw vacuum pump has some shortcomings: first, no internal lubrication structure is provided, which easily shortens the service life of the bearing due to friction and wear during rotation; second, the internal parts are not designed as an integrated whole, which will increase the difficulty of the overall mechanical seal during installation and subsequent maintenance, and is not conducive to installation and replacement. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a mechanical seal for a screw vacuum pump, which can effectively solve the problems in the prior art that an internal lubrication structure is not designed, which easily leads to friction and wear of the bearings during rotation, thereby reducing the service life of the bearings, and the internal parts are not designed as an integrated whole, which easily leads to difficulty in installation and subsequent maintenance of the overall mechanical seal, and is inconvenient to install and replace.

[0005] The technical solution adopted by the utility model is: a mechanical seal for a screw vacuum pump, comprising a pump body and a pump shaft arranged inside the pump body, a bearing is fixedly installed on the outside of the pump shaft, a stationary ring seat is fixedly installed on the inside of the pump shaft, a sealing ring 1 is fixedly installed on one side of the stationary ring seat, a spring is fixedly installed inside the stationary ring seat, a push ring is arranged on the inside of the stationary ring seat, a sealing ring 2 is fixedly installed on one side of the push ring, a stationary ring body is arranged on the other side of the sealing ring 2, a dynamic ring body is arranged on one side of the static ring body, a sealing ring 3 is fixedly installed on one side of the dynamic ring body, and a dynamic ring seat is fixedly installed on the inside of the pump body.

[0006] Preferably, a vacuum chamber is provided inside the pump body and the pump shaft, and the vacuum chamber is located outside the stationary ring seat.

[0007] Through the above technical solution and the design of the vacuum chamber, sealing can be achieved between the pump body, the pump shaft and the stationary ring seat, which can reduce the possibility of external gas entering the sealing area, thereby better maintaining the sealing environment and improving the overall sealing effect. The vacuum chamber can also play a certain isolation role and effectively extend its service life.

[0008] Preferably, an oil flow channel is provided on one side of the stationary ring seat, an oil side is provided on one side of the bearing, and the oil flow channel is communicated with the oil side.

[0009] Through the above technical solution and the design of the oil flow channel, the oil can smoothly reach the oil side through the oil flow channel, provide sufficient lubrication for the bearings, reduce friction and wear, and extend the service life of the bearings. In addition, the flow of oil can take away the heat generated by the bearings during operation, avoiding performance degradation or damage due to overheating.

[0010] Preferably, an oil guide channel is opened on the outer side of one side of the stationary ring seat, and the oil guide channel is provided in a plurality, and the plurality of oil guide channels are distributed in a ring shape about the center line of the stationary ring seat.

[0011] Through the above technical solution and the design of the oil guide channel, when there is splashed oil on the top of the static ring seat, the splashed oil can flow to one side of the sealing surface, thereby guiding the splashed oil to lubricate the sealing surface and improving the smoothness of the overall mechanical seal during use.

[0012] Preferably, a guide column is fixedly mounted on one side of the static ring body, and the static ring body is adapted to the dynamic ring body through the guide column.

[0013] Through the above technical solution, through the design of the guide column, when the guide column is inserted into the interior of the dynamic ring body, the static ring body and the dynamic ring body can be quickly installed, which can facilitate subsequent maintenance and replacement.

[0014] Preferably, the outer ring of the bearing is matched with the stationary ring seat, and the outer ring of the bearing, the stationary ring seat and the pump body are of an integrated design.

[0015] Through the above technical solution, through the cooperation of the outer ring of the bearing, the stationary ring seat and the pump body, the outer ring of the bearing, the stationary ring seat and the pump body can be closely connected, making the overall structure more stable. At the same time, when the pump is running, it can reduce failures and vibrations caused by relative displacement or loosening of components. The three-in-one can better withstand the various forces generated when the pump is working, including axial force and radial force, etc., to ensure the stable operation of the machine seal.

[0016] Preferably, the inner ring of the bearing is matched with the dynamic ring seat, and the inner ring of the bearing, the dynamic ring seat and the pump shaft are of an integrated design.

[0017] Through the above technical solution, through the cooperation of the inner ring of the bearing, the dynamic ring seat and the pump shaft, not only can the power of the pump shaft be transmitted to the dynamic ring seat more efficiently, reducing the energy loss in the transmission process, but also the assembly process is simplified, reducing the errors and problems that may be caused by the separate assembly of multiple components.

[0018] Preferably, an extended portion of the stationary ring body is provided with an oil-throwing port, and a plurality of the oil-throwing ports are provided, and the plurality of the oil-throwing ports are distributed in a ring shape about a center line of the stationary ring body.

[0019] Through the above technical solution, the movement of the engine oil can be enhanced through the design of the oil throwing port, and it is also convenient for users to observe the matching of the pin of the dynamic ring seat and the groove of the dynamic ring body when the overall machine seal is installed.

[0020] Preferably, a clamping ring is fixedly mounted on the outer side of the stationary ring body, and the clamping ring is adapted to the stationary ring body.

[0021] Through the above technical solution and the design of the clamping ring, when the machine seal is not assembled, the clamping ring can clamp the static ring body, so that the static ring seat, spring, push ring and static ring body remain as a whole, which is not only convenient for installation, but also convenient for subsequent maintenance and replacement by the staff.

[0022] Preferably, the sealing ring 1, the sealing ring 2 and the sealing ring 3 are rubber sealing rings, and the sealing ring 1, the sealing ring 2 and the sealing ring 3 are "O"-shaped structures.

[0023] Through the above technical solution, through the design of the rubber sealing ring, the sealing between internal components can be improved to avoid leakage between internal parts. At the same time, the "O" ring made of rubber material has a certain elasticity and resilience, can maintain stable sealing performance during long-term use, is not prone to permanent deformation or failure, and has strong stability.

[0024] Compared with the prior art, the utility model provides a mechanical seal for a screw vacuum pump, which has the following beneficial effects:

[0025] 1. The mechanical seal of the screw vacuum pump can achieve sealing between the pump body, pump shaft and stationary ring seat through the design of the vacuum chamber, which can reduce the possibility of external gas entering the sealing area, thereby better maintaining the sealing environment and improving the overall sealing effect. At the same time, it isolates the bearing box from the vacuum chamber to prevent oil from leaking into the vacuum chamber;

[0026] 2. The screw vacuum pump uses a mechanical seal. Through the design of the oil flow channel, the oil can smoothly reach the oil side through the oil flow channel, providing sufficient lubrication for the bearing, reducing friction and wear, and extending the service life of the bearing. In addition, the flow of oil can take away the heat generated by the bearing during operation, avoiding performance degradation or damage due to overheating;

[0027] 3. The screw vacuum pump uses a mechanical seal. Through the design of the clamp ring, when the mechanical seal is not assembled, the clamp ring can clamp the static ring body, so that the static ring seat, spring, push ring and static ring body remain as a whole, which is not only convenient for installation, but also convenient for the staff to maintain and replace in the future;

[0028] 4. The mechanical seal of the screw vacuum pump can enhance the movement of the oil through the design of the oil throwing port, and it can also facilitate the user to observe the matching of the pin of the dynamic ring seat and the groove of the dynamic ring body when the overall mechanical seal is installed;

[0029] 5. The screw vacuum pump uses a mechanical seal. The outer ring of the bearing presses the static ring seat of the mechanical seal, so that the outer ring of the bearing, the static ring seat of the mechanical seal, and the pump body are connected as a whole. The inner ring of the bearing presses the dynamic ring seat of the mechanical seal, so that the inner ring of the bearing, the dynamic ring seat of the mechanical seal, and the pump shaft are connected as a whole, and at the same time drive the dynamic ring of the mechanical seal to rotate, which not only reduces the loss of energy in the transmission process, but also simplifies the assembly process and reduces the errors and problems that may be caused by the separate assembly of multiple components. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0031] Figure 2 The schematic diagram of the pump shaft and bearing installation structure of the utility model Figure 1 ;

[0032] Figure 3 The schematic diagram of the pump shaft and bearing installation structure of the utility model Figure 2 ;

[0033] Figure 4 This is a schematic diagram of the cross-sectional structure of the utility model;

[0034] Figure 5 The structure of the clamp ring and the oil-slinging port of the utility model is shown in FIG. Figure 1 ;

[0035] Figure 6 The structure of the clamp ring and the oil-slinging port of the utility model is shown in FIG. Figure 2 ;

[0036] Figure 7 This is a schematic diagram of the split structure of the utility model;

[0037] Figure 8 This is a schematic diagram of the three-dimensional structure of the static ring body of the utility model;

[0038] Fig. 9 The three-dimensional structure of the stationary ring seat of the utility model is shown in FIG. Figure 1 ;

[0039] Fig.10 The three-dimensional structure of the stationary ring seat of the utility model is shown in FIG. Figure 2 .

[0040] Among them: 1. Pump body; 2. Pump shaft; 3. Bearing; 4. Stationary ring seat; 5. Sealing ring 1; 6. Spring; 7. Push ring; 8. Sealing ring 2; 9. Stationary ring body; 10. Moving ring body; 11. Sealing ring 3; 12. Moving ring seat; 13. Retaining ring; 14. Oil throwing port; 15. Vacuum chamber; 16. Oil flow channel; 17. Oil side; 18. Oil guide flow channel; 19. Guide column. DETAILED DESCRIPTION

[0041] 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 described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0042] Embodiment 1: Figure 1-10 As shown, the utility model provides a mechanical seal for a screw vacuum pump, comprising a pump body 1 and a pump shaft 2 arranged inside the pump body 1, a bearing 3 is fixedly installed on the outside of the pump shaft 2, a stationary ring seat 4 is fixedly installed inside the pump shaft 2, a sealing ring 1 5 is fixedly installed on one side of the stationary ring seat 4, a spring 6 is fixedly installed inside the stationary ring seat 4, a push ring 7 is arranged on the inside of the stationary ring seat 4, a sealing ring 2 8 is fixedly installed on one side of the push ring 7, a stationary ring body 9 is arranged on the other side of the sealing ring 2 8, a dynamic ring body 10 is arranged on one side of the stationary ring body 9, a sealing ring 3 11 is fixedly installed on one side of the dynamic ring body 10, and a dynamic ring seat 12 is fixedly installed on the inner side of the pump body 1.

[0043] Specifically, a vacuum chamber 15 is provided on the inner side of the pump body 1 and the pump shaft 2, and the vacuum chamber 15 is located on the outer side of the stationary ring seat 4. The advantage is that, through the design of the vacuum chamber 15, sealing can be achieved between the pump body 1, the pump shaft 2 and the stationary ring seat 4, which can reduce the possibility of external gas entering the sealing area, thereby better maintaining the sealing environment and improving the overall sealing effect. In addition, the vacuum chamber 15 can also play a certain isolation role, which can effectively extend its service life.

[0044] Specifically, an oil flow channel 16 is opened on one side of the stationary ring seat 4, and an oil side 17 is set on one side of the bearing 3. The oil flow channel 16 is communicated with the oil side 17. The advantage is that, through the design of the oil flow channel 16, the oil can smoothly reach the oil side 17 through the oil flow channel 16, so as to provide sufficient lubrication for the bearing 3, reduce friction and wear, and extend the service life of the bearing 3. In addition, the flow of oil can take away the heat generated by the bearing 3 during operation, so as to avoid performance degradation or damage due to overheating.

[0045] Specifically, an oil guide channel 18 is opened on the outer side of one side of the stationary ring seat 4, and a plurality of oil guide channels 18 are provided. The plurality of oil guide channels 18 are distributed in a ring shape about the center line of the stationary ring seat 4. The advantage is that, through the design of the oil guide channel 18, when there is splashed oil on the top of the stationary ring seat 4, the splashed oil can flow to one side of the sealing surface, thereby guiding the splashed oil to lubricate the sealing surface, thereby improving the smoothness of the overall machine seal during use.

[0046] Specifically, a guide column 19 is fixedly installed on one side of the static ring body 9, and the static ring body 9 is adapted to the dynamic ring body 10 through the guide column 19. The advantage is that through the design of the guide column 19, when the guide column 19 is inserted into the interior of the dynamic ring body 10, the static ring body 9 and the dynamic ring body 10 can be quickly installed, which can facilitate later maintenance and replacement.

[0047] Specifically, the outer ring of the bearing 3 is matched with the stationary ring seat 4, and the outer ring of the bearing 3, the stationary ring seat 4 and the pump body 1 are of an integrated design. The advantage is that through the cooperation of the outer ring of the bearing 3, the stationary ring seat 4 and the pump body 1, the outer ring of the bearing 3, the stationary ring seat 4 and the pump body 1 can be closely connected, making the overall structure more stable. At the same time, when the pump is running, it can reduce failures and vibrations caused by relative displacement or loosening of components, and the three-in-one can better withstand various forces generated when the pump is working, including axial force and radial force, etc., to ensure the stable operation of the machine seal.

[0048] Embodiment 2: Figure 2-10 As shown, as an improvement to the previous embodiment.

[0049] Specifically, the inner ring of the bearing 3 is matched with the dynamic ring seat 12, and the inner ring of the bearing 3, the dynamic ring seat 12 and the pump shaft 2 are of an integrated design. The advantage is that through the cooperation of the inner ring of the bearing 3, the dynamic ring seat 12 and the pump shaft 2, not only can the power of the pump shaft 2 be transmitted to the dynamic ring seat 12 more efficiently, reducing the energy loss in the transmission process, but also simplifying the assembly process and reducing the errors and problems that may be caused by the separate assembly of multiple components.

[0050] Specifically, the extended portion of the static ring body 9 is provided with an oil-flinging port 14, and a plurality of the oil-flinging ports 14 are arranged, and the plurality of oil-flinging ports 14 are distributed in a ring shape about the center line of the static ring body 9. The advantage is that the design of the oil-flinging port 14 can enhance the movement of the engine oil, and can also facilitate the user to observe the pairing of the pin of the dynamic ring seat 12 and the slot of the dynamic ring body 10 when the overall machine seal is installed.

[0051] Specifically, a clamping ring 13 is fixedly installed on the outside of the static ring body 9, and the clamping ring 13 is adapted to the static ring body 9. The advantage is that, through the design of the clamping ring 13, when the machine seal is not assembled, the clamping ring 13 can clamp the static ring body 9, so that the static ring seat 4, spring 6, push ring 7 and static ring body 9 can be maintained as a whole, which is not only convenient for installation, but also convenient for later maintenance and replacement by the staff.

[0052] Specifically, the sealing ring 1 5, the sealing ring 2 8 and the sealing ring 3 11 are rubber sealing rings, and the sealing ring 1 5, the sealing ring 2 8 and the sealing ring 3 11 are "O"-shaped structures. The advantage is that the design of the rubber sealing ring can improve the sealing between internal components and avoid leakage between internal parts. At the same time, the "O"-ring made of rubber material has certain elasticity and resilience, can maintain stable sealing performance during long-term use, is not prone to permanent deformation or failure, and has strong stability.

[0053] Working principle: When in use, the design of the vacuum chamber 15 can achieve sealing between the pump body 1, the pump shaft 2 and the stationary ring seat 4, which can reduce the possibility of external gas entering the sealing area, thereby better maintaining the sealing environment and improving the overall sealing effect. The vacuum chamber 15 can also play a certain isolation role and effectively extend its service life. Through the design of the oil guide channel 18, when there is splashed oil on the top of the stationary ring seat 4, the splashed oil can flow to one side of the sealing surface, thereby guiding the splashed oil to lubricate the sealing surface and improve the smoothness of the overall machine seal when in use. Through the design of the guide column 19, when using The guide column 19 is inserted into the interior of the dynamic ring body 10, which can facilitate the rapid installation of the static ring body 9 and the dynamic ring body 10, and can facilitate the later maintenance and replacement. Through the cooperation of the outer ring of the bearing 3, the static ring seat 4 and the pump body 1, the outer ring of the bearing 3, the static ring seat 4 and the pump body 1 can be closely connected, making the overall structure more stable. At the same time, when the pump is running, it can reduce the failure and vibration caused by the relative displacement or looseness of the components. The three-in-one can better withstand the various forces generated when the pump is working, including axial force and radial force, etc., to ensure the stable operation of the machine seal. Through the cooperation of the inner ring of the bearing 3, the dynamic ring seat 12 and the pump shaft 2, it can not only be more efficient The power of the pump shaft 2 is transmitted to the dynamic ring seat 12, which reduces the loss of energy in the transmission process, simplifies the assembly process, and reduces the errors and problems that may be caused by the separate assembly of multiple components. The design of the oil-throwing port 14 can enhance the movement of the engine oil, and can also facilitate the user to observe the matching of the pin of the dynamic ring seat 12 and the groove of the dynamic ring body 10 when the overall machine seal is installed. The design of the clamping ring 13 can make the clamping ring 13 clamp the static ring body 9 when the machine seal is not assembled, so that the static ring seat 4, the spring 6, the push ring 7 and the static ring body 9 remain as a whole, which is not only convenient for installation, but also convenient for the staff to maintain and replace in the later stage. Through the design of the rubber sealing ring, the sealing performance between internal components can be improved to avoid leakage between internal parts. At the same time, the "O" ring made of rubber material has certain elasticity and resilience, can maintain stable sealing performance in long-term use, is not prone to permanent deformation or failure, and has strong stability. Through the design of the oil flow channel 16, the oil can pass through the oil flow channel 16 to the oil side 17 smoothly, provide sufficient lubrication for the bearing 3, reduce friction and wear, and extend the service life of the bearing 3. In addition, the flow of oil can take away the heat generated by the bearing 3 during operation, avoiding its performance degradation or damage due to overheating.

[0054] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mechanical seal for a screw vacuum pump, comprising a pump body (1) and a pump shaft (2) arranged inside the pump body (1), characterized in that: A bearing (3) is fixedly mounted on the outer side of the pump shaft (2); a stationary ring seat (4) is fixedly mounted on the inner side of the pump shaft (2); a sealing ring 1 (5) is fixedly mounted on one side of the stationary ring seat (4); a spring (6) is fixedly mounted on the inner side of the stationary ring seat (4); a push ring (7) is arranged on the inner side of the stationary ring seat (4); a sealing ring 2 (8) is fixedly mounted on one side of the push ring (7); a stationary ring body (9) is arranged on the other side of the sealing ring 2 (8); a moving ring body (10) is arranged on one side of the stationary ring body (9); a sealing ring 3 (11) is fixedly mounted on one side of the moving ring body (10); and a moving ring seat (12) is fixedly mounted on the inner side of the pump body (1).

2. A mechanical seal for a screw vacuum pump according to claim 1, characterized in that: A vacuum chamber (15) is provided inside the pump body (1) and the pump shaft (2), and the vacuum chamber (15) is located outside the stationary ring seat (4).

3. A mechanical seal for a screw vacuum pump according to claim 2, characterized in that: An oil flow channel (16) is provided on one side of the stationary ring seat (4), an oil side (17) is provided on one side of the bearing (3), and the oil flow channel (16) is in communication with the oil side (17).

4. A mechanical seal for a screw vacuum pump according to claim 3, characterized in that: An oil guide channel (18) is provided on the outer side of one side of the stationary ring seat (4), and a plurality of the oil guide channels (18) are provided. The plurality of oil guide channels (18) are distributed in a ring shape about the center line of the stationary ring seat (4).

5. A mechanical seal for a screw vacuum pump according to claim 4, characterized in that: A guide column (19) is fixedly mounted on one side of the static ring body (9), and the static ring body (9) is adapted to the dynamic ring body (10) via the guide column (19).

6. A mechanical seal for a screw vacuum pump according to claim 5, characterized in that: The outer ring of the bearing (3) is matched with the stationary ring seat (4), and the outer ring of the bearing (3), the stationary ring seat (4) and the pump body (1) are of an integrated design.

7. A mechanical seal for a screw vacuum pump according to claim 6, characterized in that: The inner ring of the bearing (3) is matched with the dynamic ring seat (12), and the inner ring of the bearing (3), the dynamic ring seat (12) and the pump shaft (2) are of an integrated design.

8. A mechanical seal for a screw vacuum pump according to claim 7, characterized in that: The extended portion of the stationary ring body (9) is provided with an oil-throwing port (14), and a plurality of the oil-throwing ports (14) are provided. The plurality of oil-throwing ports (14) are distributed in a ring shape with respect to the center line of the stationary ring body (9).

9. A mechanical seal for a screw vacuum pump according to claim 8, characterized in that: A clamping ring (13) is fixedly mounted on the outside of the stationary ring body (9), and the clamping ring (13) is adapted to the stationary ring body (9).

10. A mechanical seal for a screw vacuum pump according to claim 9, characterized in that: The sealing ring 1 (5), the sealing ring 2 (8) and the sealing ring 3 (11) are rubber sealing rings, and the sealing ring 1 (5), the sealing ring 2 (8) and the sealing ring 3 (11) are "O"-shaped structures.

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