Safe mechanical sealing device for flushing-free high-temperature condensate pump
By opening multiple grooves on the static ring end surface of the high-temperature condensate pump, mechanical forced lubrication and fluid dynamic pressure effects are achieved, and the problem of poor seal reliability of high-temperature condensate pumps in the prior art is solved, extending the seal service life and improving safety and reliability.
Patent Information
- Application Number
- CN202422166033.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-09-04
AI Technical Summary
In high-temperature condensate pumps, the existing wet sealing moving ring cannot form a liquid lubricating film in the environment of steam-liquid mixed media, resulting in poor seal reliability and short service life, which affects the safe and reliable operation of the device.
A safe mechanical sealing device for flush-free high-temperature condensate pump is designed, and a plurality of first grooves and second grooves are opened on the end surface of the static ring. The lubrication is improved through the mechanical forced lubrication effect, the temperature is reduced, and the cavitation area is expanded through the combination of grooves, the fluid dynamic pressure effect is increased, the closing force is balanced, and the sealing is achieved is non-contact.
Through mechanical forced lubrication and fluid dynamic pressure effect, the sealing device improves the adaptability and stability of the seal, extends the sealing service life, and improves the safe and reliable operation of the high-temperature condensate pump.
Smart Images
Figure CN223049069U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mechanical seal devices, and particularly relates to a safety mechanical seal device for a non-flushing high-temperature condensate pump. Background Technique
[0002] The condensate pump is a process pump in a refining device. The medium conveyed by this pump is water, at atmospheric pressure, and the temperature is 100°C to 120°C. The medium is in a vapor-liquid mixture state, with water vapor as the main component. Due to the limitation of the seal cavity space, it is impossible to arrange a PLAN23 auxiliary system to cool the medium in the seal cavity and convert the vapor-liquid mixture into liquid water, and the working environment of the seal is extremely harsh.
[0003] For the wet seals of the prior art, the end faces of the dynamic ring and the static ring are not grooved. When the seal works, the dynamic ring rotates relative to the static ring, and the end faces remain in contact during the frictional movement. There is a liquid lubricating film between the end faces to ensure the long life, reliable operation and work of the seal.
[0004] In an environment of condensate medium at atmospheric pressure and a temperature of 100°C to 120°C, with water vapor as the main component in a vapor-liquid mixture, a liquid lubricating film cannot be formed between the end faces, resulting in dry running phenomenon. The seal reliability is poor and the service life is short, which affects the safe and reliable operation of the device.
[0005] In order to solve the above problems, we propose a safety mechanical seal device for a non-flushing high-temperature condensate pump. Content of the Utility Model
[0006] The purpose of the utility model is to provide a safety mechanical seal device for a non-flushing high-temperature condensate pump to solve the problems raised in the above background technique.
[0007] To achieve the above purpose, the utility model provides the following technical solution: A safety mechanical seal device for a non-flushing high-temperature condensate pump, including a shaft sleeve, a transmission ring, an inner gland, an outer gland, a water seal, a dynamic ring, a static ring and a retaining ring; the shaft sleeve is sleeved on the seal;
[0008] The transmission ring is sleeved on one end of the shaft sleeve; the water seal is sleeved on the shaft sleeve near the transmission ring; the outer gland is sleeved on the water seal; the inner gland is sleeved on the outer gland; one side surface of the inner gland abuts against one side surface of the outer gland; the dynamic ring is sleeved on the other end of the shaft sleeve; the static ring is sleeved on one end of the outer gland; the retaining ring is arranged between the static ring and the outer gland; the retaining ring is sleeved on the outer gland;
[0009] A plurality of first grooves and a plurality of second grooves are formed on the end face of the static ring; the plurality of first grooves and the plurality of second grooves are evenly distributed circumferentially along the end face of the static ring.
[0010] Preferably, a spring box, an anti-rotation screw for the spring box, a spring, and a push ring; one end face of the spring box abuts against the end face of the outer gland facing the static ring; the spring box is connected to the outer gland by the anti-rotation screw for the spring box; the spring is arranged inside the spring box; one end of the spring abuts against the inner wall of the spring box; the other end of the spring abuts against one end face of the push ring; the other end face of the push ring abuts against the end face of the static ring; the push ring is sleeved on the outer gland.
[0011] Preferably, a snap ring is provided at one end of the connection between the outer gland and the water seal.
[0012] Preferably, a shaft sleeve seal ring is arranged between the shaft sleeve and the seal.
[0013] Preferably, the shaft sleeve is connected to the dynamic ring by an anti-rotation pin for the dynamic ring.
[0014] Preferably, a setscrew is arranged inside the transmission ring; the transmission ring is connected to the shaft sleeve by the setscrew.
[0015] Preferably, a gland seal ring is provided on the end face where the outer gland abuts against the inner gland.
[0016] Preferably, a static ring seal ring is provided on the contact surface between the static ring and the outer gland; a dynamic ring seal ring is provided on the contact surface between the dynamic ring and the shaft sleeve.
[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows: for the safety mechanical seal device for the non-flushing high-temperature condensate pump, two kinds of grooves, namely a first groove and a second groove, are opened on the end face of the static ring. The purpose of opening the grooves on the end face of the static ring is to generate a mechanical forced lubrication effect on the end face of the static ring during rotation, improve the lubrication of the end face of the static ring, and reduce the temperature of the end face of the static ring. For the end face of the static ring, different temperature zones are formed due to different temperatures in the grooved area and the non-grooved area, and the axial expansion amounts of each temperature zone are different. The waviness deformation of the end face of the static ring is beneficial to lubrication.
[0018] Through the combination of the first groove and the second groove, the cavitation area of the end face of the static ring is enlarged, the hydrodynamic pressure effect of the fluid is increased, the closing force is balanced, non-contact sealing is achieved, the sealing adaptability and stability are improved, and the service life of the seal is prolonged.
[0019] The seal adopts a stationary multi-spring seal, and the spring box and the outer gland are connected by an anti-rotation screw, which is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 is a schematic cross-sectional view of the structure of the present utility model;
[0021] Figure 2 is a left side view schematic diagram of the structure of the static ring of the present utility model;
[0022] Figure 3 Isometric schematic diagram of the stationary ring structure of the present utility model.
[0023] In the figure: 1 - shaft sleeve, 2 - shaft sleeve sealing ring, 3 - anti-rotation pin of the moving ring, 4 - transmission ring, 5 - set screw, 6 - inner gland, 7 - outer gland, 8 - water seal, 9 - circlip, 10 - gland sealing ring, 11 - spring box, 12 - anti-rotation screw of the spring box, 13 - spring, 14 - moving ring, 15 - stationary ring, 151 - first groove, 152 - second groove, 16 - push ring, 17 - retaining ring, 18 - stationary ring sealing ring, 19 - moving ring sealing ring. Specific embodiments
[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0025] Please refer to Figure 1 , Figure 2 , Figure 3 , the present utility model provides a technical solution: a safety mechanical seal device for a non-flushing high-temperature condensate pump, which meets the requirements of a short sealing cavity size, has no PLAN23 auxiliary system support for the sealing device, and works in an environment of a vapor-liquid mixture mainly composed of water vapor, including a shaft sleeve 1, a transmission ring 4, an inner gland 6, an outer gland 7, a water seal 8, a moving ring 14, a stationary ring 15, and a retaining ring 17. The shaft sleeve 1 is sleeved on the seal.
[0026] The transmission ring 4 is sleeved on one end of the shaft sleeve 1. The water seal 8 is sleeved on the shaft sleeve 1 near the transmission ring 4. The outer gland 7 is sleeved on the water seal 8. The inner gland 6 is sleeved on the outer gland 7. One side of the inner gland 6 abuts against one side of the outer gland 7. The moving ring 14 is sleeved on the other end of the shaft sleeve 1. The stationary ring 15 is sleeved on one end of the outer gland 7. The retaining ring 17 is arranged between the stationary ring 15 and the outer gland 7. The retaining ring 17 is sleeved on the outer gland 7.
[0027] A plurality of first grooves 151 and a plurality of second grooves 152 are formed on the end face of the stationary ring 15. The plurality of first grooves 151 and the plurality of second grooves 152 are evenly distributed circumferentially along the end face of the stationary ring 15.
[0028] The end face of the stationary ring 15 is provided with two kinds of grooves. The first groove 151 is a semi-circular crescent groove with a radius of 6 mm to 8 mm, which is evenly distributed along the circumferential direction of the end face of the stationary ring 15. The number of the first grooves 151 is 8 to 12, the chord length is 20 mm to 30 mm, and the groove depth is 1 mm to 1.5 mm.
[0029] The second groove 152 is a square groove, which is evenly distributed along the circumferential direction of the end face of the stationary ring 15. The number of the second grooves 152 is 8 to 12, the chord length is 20 mm to 30 mm, and the groove depth is 1 mm to 1.5 mm.
[0030] Among them, as Figure 2 shown, the first groove 151 and the second groove 152 are staggered.
[0031] The purpose of grooving the end face of the stationary ring 15 is to generate a mechanical forced lubrication effect on the end face of the stationary ring 15 during rotation, improve the lubrication of the end face of the stationary ring 15, and reduce the temperature of the end face of the stationary ring 15. For the end face of the stationary ring 15, different temperature zones are formed due to the different temperatures of the grooved area and the ungrooved area on the end face of the stationary ring 15, and the axial expansion amounts of each temperature zone are different. The waviness deformation of the end face of the stationary ring 15 is beneficial to lubrication.
[0032] Through the combination of the first groove 151 and the second groove 152, the cavitation area of the end face of the stationary ring 15 is expanded, the hydrodynamic pressure effect of the fluid is increased, the closing force is balanced, non-contact sealing is achieved, the sealing adaptability and stability are improved, and the service life of the seal is extended.
[0033] Furthermore, there are a spring box 11, a spring box anti-rotation screw 12, a spring 13 and a push ring 16. One end face of the spring box 11 abuts against the end face of the outer pressure cover 7 facing the stationary ring 15. The spring box 11 is connected to the outer pressure cover 7 through the spring box anti-rotation screw 12. The spring 13 is arranged in the spring box 11. One end of the spring 13 abuts against the inner wall of the spring box 11. The other end of the spring 13 abuts against one end face of the push ring 16. The other end face of the push ring 16 abuts against the end face of the stationary ring 15. The push ring 16 is sleeved on the outer pressure cover 7. The seal adopts a stationary multi-spring seal. The spring box 11 and the outer pressure cover 7 are connected by the spring box anti-rotation screw 12, and the installation is simple.
[0034] Furthermore, a snap ring 9 is provided at one end of the connection between the outer pressure cover 7 and the water seal 8.
[0035] Furthermore, a shaft sleeve seal ring 2 is arranged between the shaft sleeve 1 and the seal.
[0036] Furthermore, the shaft sleeve 1 is connected to the moving ring 14 through a moving ring anti-rotation pin 3.
[0037] Furthermore, a set screw 5 is provided inside the transmission ring 4. The transmission ring 4 is connected to the shaft sleeve 1 through the set screw 5.
[0038] Furthermore, a gland seal ring 10 is provided on the end face of the outer gland 7 that abuts against the inner gland 6.
[0039] Furthermore, a stationary seal ring 18 is provided on the contact surface between the stationary ring 15 and the outer gland 7. A rotating seal ring 19 is provided on the contact surface between the rotating ring 14 and the shaft sleeve 1.
[0040] Adding the seal rings is to improve the sealing effect.
[0041] Working principle:
[0042] When rotating, it produces a mechanical forced lubrication effect on the end face of the stationary ring 15, improves the lubrication of the end face of the stationary ring 15, and reduces the temperature of the end face of the stationary ring 15. For the end face of the stationary ring 15, different temperature zones are formed due to the different temperatures in the grooved area and the non-grooved area on the end face of the stationary ring 15, and the axial expansion amounts of each temperature zone are different. The waviness deformation of the end face of the stationary ring 15 is beneficial to lubrication.
[0043] The applicable working conditions of the present utility model are as follows:
[0044] Medium: water;
[0045] Temperature: 100°C to 120°C;
[0046] Pressure: atmospheric pressure;
[0047] Rotational speed: less than or equal to 5000 RPM.
[0048] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.
[0049] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A safety mechanical seal device for a non-flushing high-temperature condensate pump, characterized in that: It comprises a shaft sleeve (1), a transmission ring (4), an inner pressure cover (6), an outer pressure cover (7), a water seal (8), a dynamic ring (14), a static ring (15) and a retaining ring (17); the shaft sleeve (1) is sleeved on the sealing member; The transmission ring (4) is sleeved on one end of the shaft sleeve (1); the water seal (8) is sleeved on the shaft sleeve (1) near the transmission ring (4); the outer pressure cover (7) is sleeved on the water seal (8); the inner pressure cover (6) is sleeved on the outer pressure cover (7); one side of the inner pressure cover (6) is in contact with one side of the outer pressure cover (7); the dynamic ring (14) is sleeved on the other end of the shaft sleeve (1); the static ring (15) is sleeved on one end of the outer pressure cover (7); the retaining ring (17) is arranged between the static ring (15) and the outer pressure cover (7); the retaining ring (17) is sleeved on the outer pressure cover (7); A plurality of first grooves (151) and a plurality of second grooves (152) are provided on the end surface of the stationary ring (15); the plurality of first grooves (151) and the plurality of second grooves (152) are evenly distributed along the circumference of the end surface of the stationary ring (15).
2. A safety mechanical seal device for a non-flushing high-temperature condensate pump according to claim 1, characterized in that: A spring box (11), a spring box anti-rotation screw (12), a spring (13) and a push ring (16); one end face of the spring box (11) abuts against the end face of the outer pressure cover (7) facing the static ring (15); the spring box (11) is connected to the outer pressure cover (7) via the spring box anti-rotation screw (12); the spring (13) is arranged in the spring box (11); one end of the spring (13) abuts against the inner wall of the spring box (11); the other end of the spring (13) abuts against one end face of the push ring (16); the other end face of the push ring (16) abuts against the end face of the static ring (15); the push ring (16) is sleeved on the outer pressure cover (7).
3. A safety mechanical seal device for a non-flushing high-temperature condensate pump according to claim 1, characterized in that: A retaining spring (9) is provided at one end of the connection between the outer pressure cover (7) and the water seal (8).
4. A safety mechanical seal device for a non-flushing high-temperature condensate pump according to claim 1, characterized in that: A shaft sleeve sealing ring (2) is arranged between the shaft sleeve (1) and the sealing element.
5. The safety mechanical seal device for a non-flushing high-temperature condensate pump according to claim 1, characterized in that: The shaft sleeve (1) is connected to the moving ring (14) via a moving ring anti-rotation pin (3).
6. A safety mechanical seal device for a non-flushing high-temperature condensate pump according to claim 1, characterized in that: A top screw (5) is provided inside the transmission ring (4); the transmission ring (4) is connected to the shaft sleeve (1) via the top screw (5).
7. A safety mechanical seal device for a non-flushing high-temperature condensate pump according to claim 1, characterized in that: The end surfaces where the outer gland (7) and the inner gland (6) abut against each other are provided with gland sealing rings (10).
8. The safety mechanical seal device for a non-flushing high-temperature condensate pump according to claim 1, characterized in that: A stationary ring sealing ring (18) is provided on the contact surface between the stationary ring (15) and the outer pressure cover (7); and a dynamic ring sealing ring (19) is provided on the contact surface between the dynamic ring (14) and the shaft sleeve (1).