A leakage-proof device for a petrochemical centrifugal pump shaft end seal

Abstract

The utility model discloses a petrochemical centrifugal pump shaft end seal leak protection device, especially relates to centrifugal pump shaft end sealing technical field, including the shaft and the pump liquid shell and motor shell at the both ends of the shaft, be provided with the seal pipe between motor shell and pump liquid shell, one end of seal pipe is fixedly connected with first mounting plate, and the outside of seal pipe is equipped with the adjusting pipe, and one end of adjusting pipe is fixedly connected with second mounting plate. The utility model first is through the cooperation of the oil film in the oil seal cavity of abrasion -resistant ring, rubber ring and oil -proof ring that sets up, realizes three -level sealed protection, improves the sealed leak protection effect, and through the sliding of spacing ring in spacing groove, can adjust the distance of second mounting plate and first mounting plate, thereby the spacing of centrifugal pump motor shell and pump liquid shell is adapted, improves the adaptation effect, and through setting up abrasion -resistant ring is located outside, can form " wear -resistant - seal - wear - resistant " sandwich structure, avoids rubber ring directly bearing friction loss, thereby prolongs the life.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump shaft end sealing technology, and more specifically, to a petrochemical centrifugal pump shaft end sealing leak prevention device. Background Technology

[0002] Petrochemical centrifugal pumps are centrifugal pumps specifically designed for the petrochemical industry. They are mainly used to transport flammable, explosive, toxic, or corrosive media and must be able to withstand harsh working conditions such as high temperature and high pressure. The core principle is that the impeller rotation generates centrifugal force. They are characterized by corrosion resistance, leak-free operation, and stable operation. Typical applications include transporting liquids containing solid impurities in oil refineries. As a core conveying equipment in the petrochemical industry, the shaft end seal of the petrochemical centrifugal pump is a key link in preventing leakage of flammable, explosive, and highly corrosive media such as crude oil, methanol, and aromatics. Traditional seals often use a "single sealing ring + gland" structure, relying solely on the interference fit between the sealing ring and the rotating shaft to achieve a seal. Under the permeation of petrochemical media, the sealing ring is prone to swelling and aging, reducing the fit of the sealing surface. Furthermore, the distance between the motor housing and the pump liquid housing varies between different models of centrifugal pumps. Traditional sealing devices have a fixed length structure, and insufficient fitting accuracy can easily lead to uneven stress on the sealing surface due to installation deviations, affecting the sealing and leak-proof effect. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a petrochemical centrifugal pump shaft end sealing and leak prevention device to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a petrochemical centrifugal pump shaft end sealing and leak-proof device, comprising a rotating shaft and a pump liquid housing and a motor housing located at both ends of the rotating shaft, a sealing pipe being provided between the motor housing and the pump liquid housing, a first mounting plate being fixedly connected to one end of the sealing pipe, an adjusting pipe being sleeved on the outside of the sealing pipe, and a second mounting plate being fixedly connected to one end of the adjusting pipe. The sealing tube has an oil seal cavity in the middle. The sealing tube has a slot and a groove symmetrically arranged on both sides of the oil seal cavity in the middle. A rubber ring is provided in the middle of the slot and a wear-resistant ring is provided in the middle of the groove. A liquid inlet pipe is connected to one side of the sealing tube. A first buffer gasket is embedded on one side of the first mounting plate. A first sealing ring is embedded on the outside of one end of the sealing tube. The sealing tube has a limiting groove on its outside, and a limiting ring is fixedly connected to one end of the inner cavity of the adjusting tube. A second sealing ring is embedded in the middle of the limiting ring, and a second buffer gasket is embedded on one side of the second mounting plate.

[0005] Preferably, one end of the first mounting plate is fixedly connected to a retaining ring, and one end of the retaining ring is embedded in the middle of the gap between the pump housing and the rotating shaft.

[0006] Preferably, the first mounting plate is fixedly connected to the pump housing by bolts, and the first buffer washer is in contact with the wall of the pump housing.

[0007] Preferably, the wear-resistant ring has a circular cross-sectional shape, the rubber ring has a square cross-sectional shape, and the two rubber rings are located between the two wear-resistant rings.

[0008] Preferably, the inlet pipe is connected to the inner cavity of the oil seal cavity, a sealing plug is provided in the middle of the inlet pipe, and an end cap is threaded onto the outside of the inlet pipe.

[0009] Preferably, the limiting ring is adapted to the limiting groove, the limiting ring is disposed in the middle of the limiting groove, and the second sealing ring is in contact with the inner wall of the limiting groove.

[0010] Preferably, the first sealing ring is in contact with the inner wall of the regulating tube, the second mounting plate is fixedly connected to the wall of the motor housing by bolts, and the second buffer washer is in contact with the wall of the motor housing.

[0011] Preferably, the rotating shaft passes through the middle of the adjusting tube and the sealing tube, and the walls of the wear-resistant ring and the rubber ring are in contact with the walls of the rotating shaft.

[0012] The technical effects and advantages of this utility model are as follows: 1. This utility model firstly achieves three-level sealing protection by cooperating with the wear-resistant ring, rubber ring and oil film in the middle of the oil seal cavity, thereby improving the sealing and leak-proof effect. By sliding the limiting ring inside the limiting groove, the distance between the second mounting plate and the first mounting plate can be adjusted, thereby adapting to the distance between the centrifugal pump motor housing and the pump liquid housing, improving the adaptation effect. Furthermore, by setting the wear-resistant ring on the outside, a sandwich structure of "wear-resistant-sealing-wear-resistant" can be formed, avoiding the rubber ring from directly bearing frictional wear, thereby extending the service life. 2. This utility model also limits the rubber ring and wear-resistant ring by using slots and grooves to improve their stability. The second sealing ring cooperates with the first sealing ring to seal the connection between the regulating pipe and the first mounting plate, improving the sealing effect. The first buffer gasket and the second buffer gasket can improve the fit stability between the second mounting plate and the motor housing and the first mounting plate and the pump housing, thereby improving the uniformity of the force on the sealing surface and improving the sealing and leak-proof effect. In summary, through the interaction of the above-mentioned multiple functions, three-level sealing protection can be achieved, improving the sealing and leak-proof effect. At the same time, it can be adapted to the distance between the centrifugal pump motor housing and the pump liquid housing for adjustment and installation, providing high practicality. Attached Figure Description

[0013] Figure 1This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the connection structure between the sealing tube and the regulating tube of this utility model.

[0015] Figure 3 This is a schematic diagram of the structure of the sealing tube of this utility model.

[0016] Figure 4 This is a schematic diagram of the cross-sectional structure of the sealing tube of this utility model.

[0017] Figure 5 This is a schematic diagram of the structure of the regulating tube of this utility model.

[0018] Figure 6 This is a schematic diagram of the cross-sectional structure of the regulating tube of this utility model.

[0019] The attached figures are labeled as follows: 1. Motor housing; 2. Pump housing; 3. Shaft; 4. Sealing pipe; 5. First mounting plate; 6. Insert ring; 7. Oil seal cavity; 8. Inlet pipe; 9. End cap; 10. Slot; 11. Groove; 12. Rubber ring; 13. Wear-resistant ring; 14. First sealing ring; 15. First buffer washer; 16. Limiting groove; 17. Adjusting pipe; 18. Limiting ring; 19. Second sealing ring; 20. Second mounting plate; 21. Second buffer washer. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0021] As attached Figure 1-6 The shown is a centrifugal pump shaft end sealing and leak-proof device, including a rotating shaft 3 and a pump liquid housing 2 and a motor housing 1 located at both ends of the rotating shaft 3. A sealing pipe 4 is provided between the motor housing 1 and the pump liquid housing 2. A first mounting plate 5 is fixedly connected to one end of the sealing pipe 4, which facilitates fixing one end of the sealing pipe 4 to the pump liquid housing 2. An adjusting pipe 17 is sleeved on the outside of the sealing pipe 4. A second mounting plate 20 is fixedly connected to one end of the adjusting pipe 17, which can fix one end of the adjusting pipe 17 to the motor housing 1. By installing the adjusting pipe 17 and the sealing pipe 4 on the motor housing 1 and the pump liquid housing 2, the gap between the motor housing 1 and the rotating shaft 3, and between the pump liquid housing 2 and the rotating shaft 3 are separated and sealed. The sealing tube 4 has an oil seal cavity 7 in the middle. The sealing tube 4 has a groove 10 and a groove 11 symmetrically arranged on both sides of the oil seal cavity 7. A rubber ring 12 is arranged in the middle of the groove 10 and a wear-resistant ring 13 is arranged in the middle of the groove 11. An inlet pipe 8 is connected to one side of the sealing tube 4. A first buffer gasket 15 is embedded in one side of the first mounting plate 5. A first sealing ring 14 is embedded in the outside of one end of the sealing tube 4. Sealing oil is injected into the oil seal cavity 7 through the inlet pipe 8 to form an oil film sealing layer, realize pressure compensation, and prevent the medium from seeping through the gap of the sealing surface. The inlet pipe 8 facilitates the replenishment of sealing oil. The groove 10 and groove 11 limit the rubber ring 12 and the wear-resistant ring 13. The rubber ring 12 and the wear-resistant ring 13 can form a seal at both ends of the oil seal cavity 7 to prevent the medium from seeping through. The wear-resistant ring 13 is located on the outside, forming a sandwich structure of "wear-resistant-sealing-wear-resistant", which avoids the rubber ring 12 directly bearing friction wear and extends its service life. A limiting groove 16 is formed on the outside of the sealing tube 4. A limiting ring 18 is fixedly connected to one end of the inner cavity of the adjusting tube 17. A second sealing ring 19 is embedded in the middle of the limiting ring 18. A second buffer washer 21 is embedded on one side of the second mounting plate 20. By sliding the limiting ring 18 inside the limiting groove 16, the distance between the first mounting plate 5 and the second mounting plate 20 can be adjusted. This can accommodate centrifugal pumps with different distances between the motor housing 1 and the pump liquid housing 2. Furthermore, the cooperation between the second sealing ring 19 and the first sealing ring 14 can improve the connection sealing strength between the adjusting tube 17 and the sealing tube 4. The cooperation between the second buffer washer 21 and the first buffer washer 15 can improve the fixing strength of the second mounting plate 20 and the first mounting plate 5 after installation.

[0022] As attached Figure 1 , 3As shown in Figure 4, a retaining ring 6 is fixedly connected to one end of the first mounting plate 5. One end of the retaining ring 6 is embedded in the middle of the gap between the pump housing 2 and the rotating shaft 3. The first mounting plate 5 is fixedly connected to the pump housing 2 by bolts. The first buffer washer 15 fits against the wall of the pump housing 2. The cross-sectional shape of the wear-resistant ring 13 is set as a circular structure, and the cross-sectional shape of the rubber ring 12 is set as a square structure. The two rubber rings 12 are located between the two wear-resistant rings 13. The inlet pipe 8 is connected to the inner cavity of the oil seal cavity 7. A sealing plug is provided in the middle of the inlet pipe 8. An end cap 9 is threaded on the outside of the inlet pipe 8. The retaining ring 6 can improve the connection. The precision ensures that the seal is concentric with the shaft and the sealing surface is evenly stressed. The cooperation of the first buffer washer 15 and the second buffer washer 21 can improve the installation and fixing strength of the second mounting plate 20 and the first mounting plate 5 with the motor housing 1 and the pump housing 2, and prevent the sealing device from shifting due to pump vibration. The cooperation of the rubber ring 12 and the wear-resistant ring 13 can achieve the sealing function, reduce the wear of the rubber ring 12, and extend the service life of the rubber ring 12. The inlet pipe 8 is fixed by the sealing plug, and the opening of the inlet pipe 8 is conveniently protected by the end cap 9, ensuring that the oil seal cavity is reliably sealed and there is no oil leakage.

[0023] As attached Figure 1 , 2 As shown in Figures 3, 5, and 6, the limiting ring 18 is adapted to the limiting groove 16 and is located in the middle of the limiting groove 16. The second sealing ring 19 is in contact with the inner wall of the limiting groove 16, and the first sealing ring 14 is in contact with the inner wall of the adjusting tube 17. The second mounting plate 20 is fixedly connected to the wall of the motor housing 1 by bolts. The second buffer washer 21 is in contact with the wall of the motor housing 1. The rotating shaft 3 passes through the middle of the adjusting tube 17 and the sealing tube 4. The walls of the wear-resistant ring 13 and the rubber ring 12 are in contact with the wall of the rotating shaft 3. By sliding the limiting ring 18 inside the limiting groove 16, the distance between the first mounting plate 5 and the second mounting plate 20 can be adjusted. Furthermore, the cooperation between the second sealing ring 19 and the first sealing ring 14 does not affect the connection and sealing effect of the adjusting tube 17 and the sealing tube 4, thus improving the performance.

[0024] The working principle of this utility model is as follows: When in use, according to the distance between the centrifugal pump motor housing 1 and the pump liquid housing 2, the sliding adjustment tube 17 moves along the axial direction of the sealing tube 4, so that the second mounting plate 20 is in contact with the motor housing 1 and the first mounting plate 5 is in contact with the pump liquid housing 2. The second mounting plate 20 is fixedly connected to the motor housing 1 and the first mounting plate 5 is fixedly connected to the pump liquid housing 2 by bolts. Open the end cap 9 and take out the sealing plug. Inject sealing oil into the inlet pipe 8. At this time, the sealing oil will enter the oil seal cavity 7 and seal both ends of the sealing oil through the cooperation with the rubber ring 12. After the injection is completed, put the sealing plug and end cap back in to ensure that the oil seal cavity is sealed. When the shaft 3 rotates at high speed, the wear-resistant ring 13 fits tightly against the shaft to form the first wear-resistant barrier, preventing large particles of impurities from entering the sealing surface; the rubber ring 12 forms the second elastic seal with the shaft, and the sealing oil in the oil seal cavity 7 forms a dynamic oil film under the drive of the shaft, filling the tiny gaps in the sealing surface, achieving the third pressure compensation seal, improving the sealing strength, and preventing leakage.

[0025] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A centrifugal pump shaft end sealing and leak-proof device, comprising a rotating shaft (3) and a pump liquid housing (2) and a motor housing (1) located at both ends of the rotating shaft (3), characterized in that: A sealing tube (4) is provided between the motor housing (1) and the pump liquid housing (2). A first mounting plate (5) is fixedly connected to one end of the sealing tube (4). An adjusting tube (17) is sleeved on the outside of the sealing tube (4). A second mounting plate (20) is fixedly connected to one end of the adjusting tube (17). The sealing tube (4) has an oil seal cavity (7) in the middle. The sealing tube (4) has a groove (10) and a recess (11) symmetrically arranged on both sides of the oil seal cavity (7). A rubber ring (12) is provided in the middle of the groove (10), and a wear-resistant ring (13) is provided in the middle of the recess (11). An inlet pipe (8) is connected to one side of the sealing tube (4). A first buffer gasket (15) is embedded on one side of the first mounting plate (5). A first sealing ring (14) is embedded on the outside of one end of the sealing tube (4). The sealing tube (4) has a limiting groove (16) on its outside. One end of the inner cavity of the regulating tube (17) is fixedly connected to a limiting ring (18). A second sealing ring (19) is embedded in the middle of the limiting ring (18). A second buffer gasket (21) is embedded on one side of the second mounting plate (20).

2. The petrochemical centrifugal pump shaft end sealing and leak-proof device according to claim 1, characterized in that: One end of the first mounting plate (5) is fixedly connected to a plug ring (6), and one end of the plug ring (6) is embedded in the middle of the gap between the pump housing (2) and the rotating shaft (3).

3. The petrochemical centrifugal pump shaft end sealing and leak-proof device according to claim 1, characterized in that: The first mounting plate (5) is fixedly connected to the pump housing (2) by bolts, and the first buffer washer (15) is in contact with the wall of the pump housing (2).

4. The petrochemical centrifugal pump shaft end sealing and leak-proof device according to claim 1, characterized in that: The wear-resistant ring (13) has a circular cross-sectional shape, and the rubber ring (12) has a square cross-sectional shape. The two rubber rings (12) are located between the two wear-resistant rings (13).

5. The petrochemical centrifugal pump shaft end sealing and leak-proof device according to claim 1, characterized in that: The inlet pipe (8) is connected to the inner cavity of the oil seal cavity (7). A sealing plug is provided in the middle of the inlet pipe (8), and an end cap (9) is threaded on the outside of the inlet pipe (8).

6. The petrochemical centrifugal pump shaft end sealing and leak-proof device according to claim 1, characterized in that: The limiting ring (18) is adapted to the limiting groove (16), the limiting ring (18) is located in the middle of the limiting groove (16), and the second sealing ring (19) is in contact with the inner wall of the limiting groove (16).

7. The petrochemical centrifugal pump shaft end sealing and leak-proof device according to claim 1, characterized in that: The first sealing ring (14) is in contact with the inner wall of the regulating tube (17), the second mounting plate (20) is fixedly connected to the wall of the motor housing (1) by bolts, and the second buffer washer (21) is in contact with the wall of the motor housing (1).

8. The petrochemical centrifugal pump shaft end sealing and leak-proof device according to claim 1, characterized in that: The rotating shaft (3) passes through the middle of the regulating tube (17) and the sealing tube (4), and the walls of the wear-resistant ring (13) and the rubber ring (12) are in contact with the wall of the rotating shaft (3).

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