Shutdown sealing device of centrifugal pump based on corrugated pipe
By installing multiple left sleeves, corrugated pipes and right sleeves on the pump cover of the centrifugal pump, and using high-pressure water to generate axial thrust and spring compressed corrugated pipes, the shutdown seal of the centrifugal pump is achieved, solving the problems of increased pump shaft load and unbalanced force caused by components such as flying iron in the prior art, and achieving reliable sealing between the pump shaft and the pump cover and the effect of wear-free sealing of the seal.
Patent Information
- Application Number
- CN202411517117.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-03-07
AI Technical Summary
In the shutdown sealing device of existing centrifugal pumps, the installation of components such as flying iron will increase the load of the pump shaft, generate unbalanced forces and vibration, which can easily lead to component fatigue and pump shaft damage.
A shutdown sealing device based on corrugated pipe is adopted. This device installs multiple left sleeves, corrugated pipes and right sleeves on the pump cover. Axial thrust is generated by high-pressure water, so that the rubber ring plate on the ring plate is disconnected from the pump shaft, and there is no wear during operation. When the pump shaft is shut down, the spring compresses the corrugated pipe, making the rubber ring plate and the pump shaft tightly fit, achieving sealing.
The device has no parts similar to flying iron, avoids unbalanced forces and vibration, reduces the load of the pump shaft, and realizes a reliable seal between the pump shaft and the pump cover, and the seal is not worn during operation.
Smart Images
Figure CN119572528A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a shutdown sealing device for a centrifugal pump. Background Art
[0002] Centrifugal pumps using dynamic seals must be equipped with shutdown seals to prevent the fluid in the pump body from leaking along the pump shaft when the pump is shut down.
[0003] The structure of the existing shutdown sealing device includes a static ring and a dynamic ring. The static ring is connected to the outer side of the pump cover, and the dynamic ring is sealingly sleeved on the pump shaft. The dynamic ring can move away from the static ring or move toward the static ring. The movement of the dynamic ring away from the static ring is driven by a flyweight. The flyweight is movably connected to the pump shaft. When the pump shaft rotates, the flyweight generates centrifugal force; the movement of the dynamic ring toward the static ring is driven by a spring. The spring is sleeved on the pump shaft. When the pump shaft stops, the centrifugal force of the flyweight disappears, and the spring pushes the ring to fit tightly against the static ring to achieve shutdown sealing.
[0004] The above-mentioned moving ring, flyweight and other components are all installed on the pump shaft and rotate with the pump shaft, which increases the load on the pump shaft. The flyweight is movably installed on the pump shaft. When the pump shaft rotates, unbalanced force will be generated, the movable parts will vibrate, and the parts are prone to fatigue. At the same time, the unbalanced force will also damage the pump shaft. Summary of the invention
[0005] In response to the above problems, the invention proposes a shutdown sealing device for a centrifugal pump based on a bellows. The shutdown sealing device has no parts like flying irons, no unbalanced force is generated, the shutdown sealing device is not easily damaged, and has no adverse effect on the pump shaft; when the centrifugal pump is shut down, the sealing between the pump shaft and the pump cover can be reliably achieved; when the centrifugal pump is working, the sealing is not worn.
[0006] The technical solution of the present invention is a shutdown sealing device for a centrifugal pump based on a bellows, which includes a pump cover 1, a pump shaft 2 passing through the pump cover and entering the pump body, and is characterized in that a plurality of left sleeves 4 are sealed and connected on the right end face of the pump cover, a water injection port 6 is provided on the left sleeve, and the water injection port is communicated with the water outlet of the centrifugal pump through a water pipe, a bellows 5 is welded on the right end of the left sleeve 4, a right sleeve is welded on the right end of the bellows, a plug 12 is welded on the right end of the right sleeve, a stud 11 is connected to the right end face of the plug, the stud is connected to a ring plate 8 through a nut, a plurality of guide rods 7 pass through the ring plate, the guide rods are symmetrically fixedly connected to the pump cover, an adjusting nut 10 is screwed on the right end of the guide rod, a spring 9 is sleeved on the guide rod, and the spring is located between the adjusting nut and the ring plate; a rubber ring plate 15 is connected to the left side of the ring plate, a shaft sleeve 13 is fixed on the pump shaft, and the rubber ring plate can be attached to the right end face of the shaft sleeve.
[0007] The beneficial effects of the present invention are as follows: when the centrifugal pump is working, the high-pressure water of the centrifugal pump enters the left sleeve and between the bellows and the right sleeve through the water injection port, generates an axial thrust on the plug, causes the ring plate to move to the right, and the rubber ring plate on the ring plate is out of contact with the shaft sleeve. When the centrifugal pump is working, the rubber ring plate is not worn; when the centrifugal pump is shut down, the pressure in the centrifugal pump drops greatly, and the axial thrust drops accordingly. The elastic force of the spring causes the ring plate to move to the left, and the rubber ring plate is tightly attached to the shaft sleeve to achieve shutdown sealing; the components of the shutdown sealing device are all installed on the pump cover, which reduces the load on the pump shaft. There are no movable parts such as flying iron on the pump shaft, and no unbalanced force will be generated on the pump shaft. The shutdown sealing device is not easy to be damaged and has no adverse effect on the pump shaft. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 It is a schematic diagram of the structure of the present invention.
[0009] Figure symbols: 1-pump cover, 2-pump shaft, 3-threaded seat, 4-left sleeve, 5-bellows, 6-water inlet, 7-guide rod, 8-ring plate, 9-spring, 10-adjusting nut, 11-bolt, 12-plug, 13-sleeve, 14-sealing ring, 15-rubber ring plate, 16-flange, 17-screw, 18-plug. DETAILED DESCRIPTION
[0010] A shutdown sealing device for a centrifugal pump based on a bellows comprises a pump cover 1, a pump shaft 2 passes through the pump cover and enters the pump body, wherein a plurality of left sleeves 4 are symmetrically sealed and connected on the right end face of the pump cover, a water injection port 6 is provided on the left sleeve, the water injection port is communicated with the water outlet of the centrifugal pump through a water pipe, a bellows 5 is welded to the right end of the left sleeve 4, a right sleeve is welded to the right end of the bellows 5, a plug 12 is welded to the right end of the right sleeve, a stud 11 is connected to the right end face of the plug, the stud is connected to the ring plate 8 through a nut, and a plurality of The guide rod 7 passes through the ring plate and is symmetrically fixed to the pump cover. An adjusting nut 10 is screwed on the right end of the guide rod. A spring 9 is sleeved on the guide rod and the spring is located between the adjusting nut and the ring plate. A rubber ring plate 15 is provided on the left side of the ring plate. The left end face of the rubber ring plate is in contact with the flange 16. Screws 17 pass through the flange, the rubber ring plate and the ring plate 8 to fix the rubber ring plate on the ring plate 8. A shaft sleeve 13 is fixed on the pump shaft. A sealing ring 14 is provided between the shaft sleeve and the pump shaft. The rubber ring plate can be in contact with the right end face of the shaft sleeve.
[0011] To facilitate the connection between the left sleeve and the pump cover, a sealing plate is welded to the left end of the left sleeve, an ear plate is welded to the outer circle of the left sleeve, a threaded seat 3 is provided on the pump cover, and the screws pass through the ear plate and are screwed onto the threaded seat 3.
[0012] Since the water injection port is connected to the water outlet of the centrifugal pump, particles will accumulate in the left sleeve, the right sleeve and the bellows. To clean the particles, a flushing outlet 18 is provided on the right sleeve, and the flushing outlet is blocked. When cleaning impurities, the water injection port is connected to a clean water source to remove the blockage.
[0013] In order to facilitate the cleaning of the bellows, the bellows has a single wave node, the wave node shrinks inward, and the bellows has no dead angle.
[0014] The principle is that the left sleeve, the right sleeve and the bellows form a closed cavity. When the centrifugal pump is working, the high-pressure water of the centrifugal pump enters the cavity through the water inlet, generating axial thrust on the plug. The bellows is elastic, and the plug causes the ring plate to move to the right, and the rubber ring plate on the ring plate is out of contact with the sleeve. When the centrifugal pump is working, the rubber ring plate is not worn; when the centrifugal pump is shut down, the pressure in the centrifugal pump drops greatly, and the axial thrust decreases accordingly. The elastic force of the spring compresses the bellows, causing the ring plate to move to the left, and the rubber ring plate is tightly attached to the sleeve to achieve shutdown sealing.
Claims
1. A shutdown sealing device for a centrifugal pump based on a bellows, comprising a pump cover (1), a pump shaft (2) passing through the pump cover and entering into a pump body, wherein: A plurality of left sleeves (4) are sealedly connected to the right end surface of the pump cover. The left sleeve is provided with a water injection port (6). The water injection port is connected to the water outlet of the centrifugal pump through a water pipe. A bellows (5) is welded to the right end of the left sleeve (4). A right sleeve is welded to the right end of the bellows (5). A plug (12) is welded to the right end of the right sleeve. A stud (11) is connected to the right end surface of the plug. The stud is connected to the ring plate (8) through a nut. A plurality of guide rods (7) pass through the ring plate. The guide rods are symmetrically fixedly connected to the pump cover. An adjusting nut (10) is screwed onto the right end of the guide rod. A spring (9) is sleeved on the guide rod. The spring is located between the adjusting nut and the ring plate. A rubber ring plate (15) is connected to the left side of the ring plate. A shaft sleeve (13) is fixed to the pump shaft. The rubber ring plate can be attached to the right end surface of the shaft sleeve.
2. The shutdown sealing device of a centrifugal pump based on a bellows according to claim 1, characterized in that: A sealing plate is welded to the left end of the left sleeve, an ear plate is welded to the outer circle of the left sleeve, a threaded seat (3) is arranged on the pump cover, and a screw passes through the ear plate and is screwed onto the threaded seat (3).
3. The shutdown sealing device of a centrifugal pump based on a bellows according to claim 1, characterized in that: A flushing outlet (18) is provided on the right sleeve, and the flushing outlet is swung to be blocked.
4. The shutdown sealing device of a centrifugal pump based on a bellows according to claim 3 is characterized in that: The corrugated pipe has a single node, and the node shrinks inward.