High-temperature hot water pump mechanical seal capable of being frequently started and stopped

Abstract

The utility model discloses a high-temperature hot water pump mechanical seal capable of being started and stopped frequently, which comprises a rotating assembly, a compensation ring assembly, a spring, a gland assembly, a transmission assembly and the like, a non-compensation ring in the rotating assembly is attached to the end face of a compensation ring in the compensation ring assembly, and the compensation ring assembly is installed in the gland assembly. And circumferential fixation is kept through the anti-rotating pin and the gland assembly. By means of the spring static design, the spring does not rotate along with the pump shaft in the operation process of the mechanical seal and does not make direct contact with media, and the problems that when the mechanical seal of an original structure is frequently started and stopped, the mechanical seal leaks after being actually used for a period of time due to the fact that a spring rotating type structure adopted by the mechanical seal of the high-temperature hot water pump is adopted are solved. And after an original mechanical seal is disassembled, a small spring is broken and is bent and deformed, the small spring needs to be frequently overhauled and replaced, and normal operation of equipment is seriously influenced.

Description

Technical Field

[0001] The utility model belongs to the field of mechanical seals, in particular to a mechanical seal for a high-temperature hot water pump that is frequently started and stopped. Background Art

[0002] Frequently started and stopped high-temperature hot water pumps are mainly used in the process of operation. Due to process requirements, frequent start and stop operations are required. The medium is high-temperature water, the start and stop frequency is very high, and the working conditions are relatively complex and harsh.

[0003] The mechanical seal of the high-temperature hot water pump that is frequently started and stopped originally used an imported mechanical seal with a small spring rotating structure. After a period of actual use, the mechanical seal would leak and the service life was less than one month. After the mechanical seal was disassembled, the small spring would break and bend, which required frequent maintenance, seriously affecting the normal operation of the equipment. Utility Model Content

[0004] In order to solve the problems arising from the above-mentioned background technology, the purpose of the present invention is to provide a mechanical seal for a high-temperature hot water pump that is frequently started and stopped, which has the characteristics of improving the sealing performance and service life of the mechanical seal, and solves the many problems of the small spring rotary structure used in the original imported mechanical seal of the high-temperature hot water pump that is frequently started and stopped, which may cause mechanical seal leakage, small spring breakage and bending deformation after a period of actual use, frequent maintenance and replacement, and serious impact on the normal operation of the equipment.

[0005] To achieve the above-mentioned purpose, the utility model adopts a multi-spring, balanced, spring-static structure: including a rotating component, a compensation ring component, a small spring, a pressure cover component, and a transmission component. The rotating component includes a non-compensating ring seal, a shaft sleeve seal, a non-compensating ring, a retaining ring, a shaft sleeve and a transmission pin. The compensation ring component includes a push ring, an anti-rotation pin and a compensation ring. The pressure cover assembly includes a throttle ring, a compensation ring seal, a pressure cover and a pressure cover seal. The transmission component includes a positioning block, a screw, a first set screw, a transmission ring and a second set screw.

[0006] Preferably, the rotating assembly contacts the end face of the compensating ring assembly, and an end face seal is formed by the end face contact between the compensating ring and the non-compensating ring. The compensating ring assembly is installed in the gland assembly and is circumferentially fixed to the gland by an anti-rotation pin. The rotating assembly is axially fixed to the gland assembly by a transmission assembly. The rotating assembly is fixed to the pump shaft by a transmission assembly, and the gland assembly is fixed to the pump body by nuts and studs.

[0007] Preferably, the non-compensating ring is installed in the shaft sleeve, and the non-compensating ring sealing ring is pressed into the sealing ring groove on the shaft sleeve to form a sealing point. The clamping ring is installed in the annular groove of the shaft sleeve to limit the axial movement of the non-compensating ring. The transmission pin is installed in the pin hole of the shaft sleeve and fits with the arc groove surface on the non-compensating ring to achieve circumferential fixation, which solves the problem of damage to the non-compensating ring caused by vibration and impact generated when the pump body is frequently started and stopped. A shaft sleeve sealing ring is provided between the shaft sleeve and the pump shaft. The shaft sleeve sealing ring is installed in the sealing ring groove of the shaft sleeve and is pressed by the pump shaft to form a sealing point.

[0008] Preferably, the anti-rotation pin and the push ring are secured together by mating with the pin hole. The end of the anti-rotation pin, distal to the push ring, is inserted into the pin hole in the gland, securing the push ring and the gland circumferentially while allowing axial relative movement. The end of the compensating ring, distal to the non-compensating ring, contacts the push ring and is secured circumferentially to the push ring via a strip-shaped notch in the compensating ring. One end of the small spring contacts the push ring, while the other end is inserted into the spring hole in the gland. The small springs provide a stable elastic force, maintaining uniform and stable pressure on the end faces of the compensating and non-compensating rings. The formation of a liquid film between the dynamic and static rings of a mechanical seal requires the pump to reach a certain speed. Under the action of the medium pressure and spring force, a certain compressive force is applied to the sealing end faces of the mechanical seal, forming an extremely thin liquid film between the end faces. Under steady-state conditions, this film maintains a sealing effect. However, frequent pump starts and stops can significantly impact the sealing performance of the mechanical seal. First, the destruction of the liquid film inevitably wears the mechanical seal end faces, and spring deformation can cause the seal end faces to loosen or fail.

[0009] Preferably, the throttling ring is installed on the side of the gland away from the compensation ring to prevent the leakage medium from directly leaking out from the gap between the gland and the sleeve. A compensation ring sealing ring is provided between the gland and the compensation ring. The compensation ring sealing ring is installed in the gland sealing ring groove and is pressed by the compensation ring to form a sealing point. The gland sealing ring is installed in the step groove of the gland and is pressed on the pump body to form a sealing point. The gland is processed with a flushing hole and a leakage hole. The flushing hole is used to provide flushing medium to the mechanical seal to maintain a good working environment for the mechanical seal, and the leakage hole is used to lead the leakage medium out from here.

[0010] Preferably, the transmission ring is mounted on the shaft sleeve and is fixed to the shaft sleeve by a first set screw, the positioning block is mounted on the transmission ring and is fixed to the transmission ring by a screw, and the end of the positioning block away from the screw cooperates with the annular groove of the gland to achieve axial fixation of the positioning block and the gland, thereby realizing a container structure of the mechanical seal, and the transmission ring is fixed to the pump shaft by a second set screw to realize the transmission of power from the pump shaft to the rotating assembly.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] 1. The utility model adopts a spring static structure. During the operation of the mechanical seal, the spring does not rotate with the pump shaft and the spring does not directly contact the medium. This can avoid deformation or breakage of the spring due to factors such as impact, vibration, centrifugal force and corrosion caused by the medium during the frequent start and stop of the pump body, which leads to destruction of the liquid film formed by the friction pair and seal failure, thereby improving the stability of the mechanical seal and extending the service life. It solves the problem that the small spring rotating structure used in the mechanical seal of the high-temperature hot water pump with frequent start and stop will cause mechanical seal leakage, small spring breakage and bending deformation after a period of actual use, requiring frequent maintenance work, and seriously affecting the normal operation of the equipment. The utility model has the advantage of improving the sealing performance and service life of the equipment.

[0013] 2. The utility model provides a non-compensating ring, and the contact surface between the non-compensating ring and the anti-rotation pin is arc-shaped, which effectively increases the contact area and reduces the impact damage caused by the anti-rotation pin to the non-compensating ring during frequent start-stop of the pump. It is suitable for working conditions with frequent start-stop.

[0014] 3. The utility model is provided with a throttle ring and a leakage hole designed on the gland, which can avoid leakage of the medium when leakage occurs. The leaked medium can be collected through the leakage hole, the leakage amount can be detected and the leakage status of the mechanical seal can be effectively judged. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the three-dimensional structure of the arc-shaped notch of the utility model;

[0017] Figure 3 This is a schematic diagram of the three-dimensional structure of the strip notch of the utility model;

[0018] Figure 4 This is a schematic diagram of the three-dimensional structure of the flushing hole of the utility model.

[0019] In the figure: 1. Rotating assembly; 2. Compensating ring assembly; 3. Spring; 4. Gland assembly; 5. Transmission assembly; 6. Pump shaft; 7. Pump body; 8. Nut; 9. Stud; 11. Non-compensating ring seal; 12. Shaft sleeve seal; 13. Non-compensating ring; 14. Retaining ring; 15. Shaft sleeve; 16. Transmission pin; 21. Push ring; 22. Anti-rotation pin; 23. Compensating ring; 41. Throttle ring; 42. Compensating ring seal; 43. Gland; 44. Gland seal; 51. Positioning block; 52. Screw; 53. First set screw; 54. Transmission ring; 55. Second set screw; 131. Arc notch; 231. Strip notch; 431. Flushing hole; 432. Leakage hole. DETAILED DESCRIPTION

[0020] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0021] like Figures 1 to 4 As shown, the utility model provides a mechanical seal for a high-temperature hot water pump that is frequently started and stopped, comprising a rotating assembly 1, a compensating ring assembly 2, a spring 3, a gland assembly 4 and a transmission assembly 5. The rotating assembly 1 comprises a non-compensating ring seal 11, a sleeve seal 12, a non-compensating ring 13, a retaining ring 14, a sleeve 15 and a transmission pin 16. The compensating ring assembly 2 comprises a push ring 21, an anti-rotation pin 22 and a compensating ring 23. The gland assembly 4 comprises a throttle ring 41, a compensating ring seal 42, a gland 43 and a gland seal 44. The transmission assembly 5 comprises a positioning block 51, a screw 52, ​​a first set screw 53, a transmission ring 54 and a second set screw 55.

[0022] Furthermore, the rotating assembly 1 is in end face contact with the compensating ring assembly 2, the compensating ring assembly 2 is installed in the gland assembly 4, and is circumferentially fixed to the gland assembly 4 by the anti-rotation pin 22, the rotating assembly 1 is axially fixed to the gland assembly 4 by the transmission assembly 5, the rotating assembly 1 is fixed to the pump shaft 6 by the transmission assembly 5, and the gland assembly 4 is fixed to the pump body 7 by the nut 8 and the stud 9.

[0023] Furthermore, the non-compensating ring 13 is installed in the shaft sleeve 15, and the non-compensating ring seal 11 is pressed into the seal groove on the shaft sleeve 15. The clamping ring 14 is installed in the annular groove of the shaft sleeve 15 to limit the axial movement of the non-compensating ring 13. The transmission pin 16 is installed on the pin hole of the shaft sleeve 15 and cooperates with the arc-shaped notch 131 on the non-compensating ring 13 to achieve circumferential fixation. A shaft sleeve seal 12 is provided between the shaft sleeve 15 and the pump shaft 6. The shaft sleeve seal 12 is installed in the seal groove of the shaft sleeve 15 and is pressed by the pump shaft 6.

[0024] Furthermore, the anti-rotation pin 22 is fixed to the push ring 21 by cooperating with the pin hole, and the end of the anti-rotation pin 22 away from the push ring 21 is inserted into the blind hole of the pressure cover 43 to achieve circumferential fixation of the push ring 21 and the pressure cover 43. The end of the compensation ring 23 away from the non-compensation ring 13 is in contact with the push ring 21, and the circumferential fixation of the compensation ring 23 and the push ring 21 is achieved by cooperating with the anti-rotation pin 22 through the strip groove 231 on the compensation ring 23. One end of the spring 3 is in contact with the push ring 21, and the other end is inserted into the blind hole of the pressure cover 43 and in contact with the bottom of the blind hole.

[0025] Furthermore, the throttling ring 41 is installed on the side of the gland 43 away from the compensation ring 23, and a compensation ring sealing ring 42 is provided between the gland 43 and the compensation ring 23. The compensation ring sealing ring 42 is installed in the sealing ring groove of the gland 43 and is pressed by the compensation ring 23. The gland sealing ring 44 is installed in the step groove of the gland 43 and is pressed on the pump body 7. The gland 43 is processed with a flushing hole 431 and a leakage hole 432.

[0026] Furthermore, the transmission ring 54 is installed on the sleeve 15, and is fixed to the sleeve 15 by a first set screw 53, and is fixed to the pump shaft 6 by a second set screw. The positioning block 51 is installed on the transmission ring 54, and is fixed to the transmission ring 54 by a screw 52. The end of the positioning block 51 away from the screw 52 cooperates with the annular groove of the pressure cover 43 to achieve axial fixation of the positioning block 51 and the pressure cover 43.

[0027] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A mechanical seal for a high-temperature hot water pump that is frequently started and stopped, comprising a rotating assembly (1), a compensating ring assembly (2), a spring (3), a gland assembly (4), and a transmission assembly (5), characterized in that: The rotating assembly (1) includes a non-compensating ring seal (11), a sleeve seal (12), a non-compensating ring (13), a retaining ring (14), a sleeve (15) and a transmission pin (16); the compensating ring assembly (2) includes a push ring (21), an anti-rotation pin (22) and a compensating ring (23); the gland assembly (4) includes a throttle ring (41), a compensating ring seal (42), a gland (43) and a gland seal (44); the transmission assembly (5) includes a positioning block (51), a screw (52), a first set screw (53) and a second set screw (54). ), a transmission ring (54) and a second set screw (55), the rotating assembly (1) and the compensating ring assembly (2) are fitted at their end faces, the compensating ring assembly (2) is installed in the gland assembly (4), and is circumferentially fixed to the gland assembly (4) by an anti-rotation pin (22), the rotating assembly (1) is axially fixed to the gland assembly (4) by the transmission assembly (5), the rotating assembly (1) is fixed to the pump shaft (6) by the transmission assembly (5), and the gland assembly (4) is fixed to the pump body (7) by a nut (8) and a stud (9).

2. A mechanical seal for a frequently started and stopped high-temperature hot water pump according to claim 1, characterized in that: The non-compensating ring (13) is installed in the shaft sleeve (15), and the non-compensating ring sealing ring (11) is pressed into the sealing ring groove on the shaft sleeve (15). The clamping ring (14) is installed in the annular groove of the shaft sleeve (15) to limit the axial movement of the non-compensating ring (13). The transmission pin (16) is installed in the pin hole of the shaft sleeve (15) and cooperates with the arc-shaped notch (131) on the non-compensating ring (13) to achieve circumferential fixation. A shaft sleeve sealing ring (12) is provided between the shaft sleeve (15) and the pump shaft (6). The shaft sleeve sealing ring (12) is installed in the sealing ring groove of the shaft sleeve (15) and is pressed by the pump shaft (6).

3. The mechanical seal for a frequently started and stopped high-temperature hot water pump according to claim 1, characterized in that: The anti-rotation pin (22) and the push ring (21) are fixed by being tightly fitted with the pin hole, and the anti-rotation pin (22) is inserted into the blind hole of the pressure cover (43) at one end away from the push ring (21) to achieve circumferential fixation of the push ring (21) and the pressure cover (43); the compensation ring (23) is in contact with the push ring (21) at one end away from the non-compensation ring (13), and the compensation ring (23) and the push ring (21) are circumferentially fixed by cooperating with the anti-rotation pin (22) through the strip-shaped notch (231) on the compensation ring (23); one end of the spring (3) is in contact with the push ring (21), and the other end is inserted into the blind hole of the pressure cover (43) and in contact with the bottom of the blind hole.

4. The mechanical seal for a frequently started and stopped high-temperature hot water pump according to claim 1, characterized in that: The throttling ring (41) is installed on the side of the gland (43) away from the compensation ring (23). A compensation ring sealing ring (42) is provided between the gland (43) and the compensation ring (23). The compensation ring sealing ring (42) is installed in the sealing ring groove of the gland (43) and is pressed by the compensation ring (23). The gland sealing ring (44) is installed in the step groove of the gland (43) and is pressed on the pump body (7). The gland (43) is processed with a flushing hole (431) and a leakage hole (432).

5. The mechanical seal for a frequently started and stopped high-temperature hot water pump according to claim 1, characterized in that: The transmission ring (54) is mounted on the shaft sleeve (15), and is fixed to the shaft sleeve (15) by a first set screw (53), and is fixed to the pump shaft (6) by a second set screw. The positioning block (51) is mounted on the transmission ring (54), and is fixed to the transmission ring (54) by a screw (52). The end of the positioning block (51) away from the screw (52) cooperates with the annular groove of the pressure cover (43), thereby achieving axial fixation of the positioning block (51) and the pressure cover (43).

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