Double-propulsion anti-peak-shaving booster pump sealing device

Abstract

The utility model relates to the technical field of mechanical sealing, in particular to a double-propulsion peak-shaving-resistant booster pump sealing device which comprises a pump shaft and a shaft sleeve, one end of the shaft sleeve is fixedly connected with the pump shaft through a hexagon socket set screw with a concave end and a positioning ring, a fourth O-shaped sealing ring is arranged between the shaft sleeve and the pump shaft, the fourth O-shaped sealing ring is arranged on the pump shaft in a sleeved mode, and the shaft sleeve is fixedly connected with the pump shaft. A standard transmission pin shaft A and a transmission key are respectively arranged in the pump shaft; a spring seat, a push ring, a rotating ring, a static ring and a gland are respectively arranged outside the shaft sleeve, and a positioning plate is arranged outside one end, close to the positioning ring, of the shaft sleeve. The sealing spring seat moves along with the thrust of the spring for compensation, so that multi-spring long-distance effective compensation of the sealing rotating ring is realized; a rotating disc centrifugally blocks flow to disperse liquid flow impulsive force, and labyrinth throttling relieves fluid oscillation; the working environment stability of the sealing ring is protected; hardening and polishing the friction surface of the mechanical sealing shaft sleeve; friction abrasion of the O-shaped ring during sliding is eliminated, and the service life of the mechanical seal is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, specifically to a dual-propulsion anti-peak-shaving front pump sealing device. Background Technology

[0002] When the booster pump in a thermal power plant operates at minimum load, the pump's output water volume is limited, leading to oscillations and extreme instability in the liquid flow within the pump chamber. This results in significant axial transmission of the pump rotor (maximum 3.5mm), causing frequent damage to the mechanical seal and affecting the unit's continuous operation. The existing sealing structure, while able to withstand the impact of rotor movement, subjectes the sealing ring to instantaneous impulses, causing abnormally large frictional thrust and severe end-face wear. Over time, this leads to seal leakage, abnormal damage to sealing components, and a short service life for the mechanical seal.

[0003] To address this, we propose a dual-propulsion anti-peak-shaving front pump sealing device. Utility Model Content

[0004] The main purpose of this utility model is to provide a dual-propulsion anti-peak-shaving front pump sealing device. The sealing spring seat moves with the spring thrust to compensate, realizing effective long-distance compensation of the sealing rotating ring with multiple springs; the centrifugal flow obstruction of the rotating disc disperses the liquid flow impact, and the labyrinth throttling alleviates fluid oscillation; it protects the stability of the working environment of the sealing ring; the friction surface of the mechanical seal bushing is hardened and polished; it eliminates friction and wear when the O-ring slides, and extends the service life of the mechanical seal, which can effectively solve the problems in the background technology.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A dual-propulsion anti-peak-shaving front pump sealing device includes a pump shaft and a bushing. The bushing is fitted onto the pump shaft. One end of the bushing is fixedly connected to the pump shaft by an internal hexagonal recessed set screw and a positioning ring. A fourth O-ring is provided between the bushing and the pump shaft. The fourth O-ring is fitted onto the pump shaft. A transmission pin A and a transmission key are respectively provided inside the pump shaft.

[0007] The outer side of the bushing is provided with a spring seat, a push ring, a rotating ring, a stationary ring, and a pressure cap. A positioning plate is provided on the outer side of the bushing near the positioning ring. The positioning plate is connected to one end of the pressure cap by an internal hex screw. The stationary ring is located between the pressure cap and the bushing. Two sets of first O-rings are provided between the stationary ring and the pressure cap.

[0008] By adopting the above technical solutions, the sealing spring seat moves with the spring thrust to compensate, achieving effective long-distance compensation of the multi-spring sealing rotating ring; the sealing ring drive and anti-rotation are designed to be in a free state during sealing assembly, avoiding the influence of external assembly forces on the shape and accuracy of the sealing ring; contact occurs only during operation to perform the driving function; the centrifugal flow obstruction of the rotating disc disperses the liquid flow force, and the labyrinth throttling alleviates fluid oscillation; protecting the stability of the working environment of the sealing ring; the friction surface of the mechanical seal bushing is hardened and polished; eliminating friction and wear during O-ring sliding, and extending the service life of the mechanical seal.

[0009] Specifically, a second O-ring is embedded at the end of the pressure cap away from the positioning plate.

[0010] Specifically, the rotating ring is located at one end of the stationary ring, and a push ring is fitted at the end of the rotating ring away from the stationary ring. The push ring and the rotating ring are driven synchronously through an R-shaped convex-concave fit.

[0011] Specifically, equal amounts of springs are inserted on both sides of the spring seat, and the push ring is located between the spring seat and the rotating ring.

[0012] Specifically, one end of the pressure cap is also connected to a hexagonal head bolt.

[0013] Specifically, a third O-ring is provided between the rotating ring and the bushing.

[0014] The beneficial effects of this utility model are as follows: The dual-propulsion anti-peak-shaving front pump sealing device of this utility model has a sealing spring seat that moves with the spring thrust to compensate, realizing effective long-distance compensation of the sealing rotating ring by multiple springs; the sealing ring drive and anti-rotation are designed to be in a free state during sealing assembly, avoiding the influence of external forces on the shape and accuracy of the sealing ring during assembly; it only makes contact during operation to perform the driving function; the centrifugal flow obstruction of the rotating disc disperses the liquid flow force, and the labyrinth throttling alleviates fluid oscillation; it protects the stability of the working environment of the sealing ring; the friction surface of the mechanical seal bushing is hardened and polished; it eliminates friction and wear when the O-ring slides, extending the service life of the mechanical seal. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the cap structure of this utility model;

[0018] In the diagram: 1. Bushing; 2. Spring; 3. Spring seat; 4. Push ring; 5. Rotating ring; 6. Stationary ring; 7. Pressure cap; 8. Socket head screw; 9. Positioning plate; 10. Socket head set screw; 11. Positioning ring; 12. First O-ring seal; 13. Second O-ring seal; 14. Third O-ring seal; 15. Drive pin A; 16. Fourth O-ring seal; 17. Drive key; 18. Hex head bolt; 19. Pump shaft. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] As one embodiment of this utility model, such as Figures 1-2 As shown, the dual-propulsion anti-peak-shaving front pump sealing device of this utility model includes a pump shaft 19 and a bushing 1. The bushing 1 is sleeved on the pump shaft 19. One end of the bushing 1 is fixedly connected to the pump shaft 19 by an internal hexagonal recessed set screw 10 and a positioning ring 11. A fourth O-ring seal 16 is provided between the bushing 1 and the pump shaft 19. The fourth O-ring seal 16 is sleeved on the pump shaft 19. A transmission pin A15 and a transmission key 17 are respectively provided inside the pump shaft 19.

[0021] The outer side of the bushing 1 is provided with a spring seat 3, a push ring 4, a rotating ring 5, a stationary ring 6, and a pressure cover 7. The outer side of the bushing 1 near the positioning ring 11 is provided with a positioning plate 9. The positioning plate 9 is connected to one end of the pressure cover 7 by an internal hex screw 8. The stationary ring 6 is located between the pressure cover 7 and the bushing 1. Two sets of first O-ring seals 12 are provided between the stationary ring 6 and the pressure cover 7.

[0022] In use, the gland 7 is connected and secured to the pump body via hexagonal head bolts 18, and sealed to the pump body via a second O-ring seal 13; the gland 7 and the stationary ring 6 are sealed and also have an anti-rotation function via two first O-ring seals 12; the bushing 1 and the pump shaft 19 are connected and secured via hexagonal head screws 10 and a positioning ring 11; the bushing 1 and the pump shaft 19 are sealed via a fourth O-ring seal 16; the spring seat 3 and the bushing 1 are driven and have a sliding function via a transmission key 17; the spring seat 3 and the push ring 4 are driven and slide via a standard transmission pin A15; the push ring 4 and the rotating ring 5 are driven synchronously via an R-type convex-concave fit; the rotating ring 5 is tightly fitted to the stationary ring 6 under the action of the spring 2, and a liquid film exists between the two friction surfaces to achieve lubrication; thus, the mechanical seal achieves a long-term stable leak-proof function.

[0023] This utility model also includes a second O-ring 13 embedded at the end of the pressure cover 7 away from the positioning plate 9.

[0024] The present invention also includes that the rotating ring 5 is located at one end of the stationary ring 6, and a push ring 4 is sleeved on the end of the rotating ring 5 away from the stationary ring 6, and the push ring 4 and the rotating ring 5 are synchronously driven by an R-shaped convex-concave fit.

[0025] This utility model also includes that equal springs 2 are inserted on both sides of the spring seat 3, and the push ring 4 is located between the spring seat 3 and the rotating ring 5;

[0026] Two rows of springs 2 are interspersed and distributed in both directions for bidirectional propulsion; assuming the sealing ring moves 3mm, the working length of a single spring 2 only increases by 1.5mm, so the spring force decays slowly, which helps to maintain the stability of the sealing ring's sealing force; thus ensuring the stable performance of the entire mechanical seal.

[0027] This utility model also includes a hexagonal head bolt 18 connected to one end of the pressure cap 7.

[0028] This utility model also includes a third O-ring seal 14 provided between the rotating ring 5 and the bushing 1.

[0029] In use, the pressure cap 7 is connected and secured to the pump body by hexagonal head bolts 18, and sealed to the pump body by a second O-ring seal 13; the pressure cap 7 and the stationary ring 6 are sealed by two first O-ring seals 12, which also serve as anti-rotation functions; the bushing 1 and the pump shaft 19 are connected and secured by an internal hexagonal recessed set screw 10 and a positioning ring 11; the bushing 1 and the pump shaft 19 are sealed by a fourth O-ring seal 16; the spring seat 3 and the bushing 1 are driven and have a sliding function by a transmission key 17; equal springs 2 are inserted on both sides of the spring seat 3, pushing them to the push ring 4 and the rotating ring 5 assembly; the spring seat 3 and the push ring 4 are driven and slid by a standard transmission pin A15; the push ring 4 and the rotating ring 5 are driven synchronously by an R-shaped convex-concave fit; the rotating ring 5 is tightly fitted to the stationary ring 6 under the action of the spring 2, and a liquid film exists between the two friction surfaces to achieve lubrication; thus, the mechanical seal achieves a long-term stable leak-proof function.

[0030] The pressure cap 7 is provided with an annular sealed chamber, which cools the mechanical seal by external cooling water entering and exiting; the sealing ring environmental chamber exhausts air through the exhaust port (which also serves as a sewage discharge port), ensuring that the area around the sealing ring is filled with room temperature water.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A sealing device for a dual-propulsion anti-peak-shaving front pump, characterized in that, Includes a pump shaft (19) and a bushing (1). The bushing (1) is fitted onto the pump shaft (19). One end of the bushing (1) is fixedly connected to the pump shaft (19) by an internal hexagonal recessed set screw (10) and a positioning ring (11). A fourth O-ring seal (16) is provided between the bushing (1) and the pump shaft (19). The fourth O-ring seal (16) is fitted onto the pump shaft (19). The pump shaft (19) is provided with a transmission pin A (15) and a transmission key (17). The bushing (1) is provided with a spring seat (3), a push ring (4), a rotating ring (5), a stationary ring (6), and a pressure cap (7) on its outer side. The bushing (1) is provided with a positioning plate (9) on its outer side near the positioning ring (11). The positioning plate (9) is connected to one end of the pressure cap (7) by an internal hexagon screw (8). The stationary ring (6) is located between the pressure cap (7) and the bushing (1). Two sets of first O-ring seals (12) are provided between the stationary ring (6) and the pressure cap (7) and are arranged in parallel.

2. The dual-propulsion anti-peak-shaving front pump sealing device according to claim 1, characterized in that, The end of the pressure cap (7) away from the positioning plate (9) is inlaid with a second O-ring (13).

3. The dual-propulsion anti-peak-shaving front pump sealing device according to claim 1, characterized in that, The rotating ring (5) is located at one end of the stationary ring (6), and a push ring (4) is sleeved on the end of the rotating ring (5) away from the stationary ring (6). The push ring (4) and the rotating ring (5) are synchronously driven by an R-shaped convex-concave fit.

4. The dual-propulsion anti-peak-shaving front pump sealing device according to claim 1, characterized in that, Equal springs (2) are inserted on both sides of the spring seat (3), and the push ring (4) is located between the spring seat (3) and the rotating ring (5).

5. The dual-propulsion anti-peak-shaving front pump sealing device according to claim 1, characterized in that, One end of the pressure cap (7) is also connected to a hexagonal head bolt (18).

6. The dual-propulsion anti-peak-shaving front pump sealing device according to claim 1, characterized in that, A third O-ring (14) is provided between the rotating ring (5) and the bushing (1).

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