High-speed centrifugal pump
By using back blades and screw structures in centrifugal pumps to prevent leakage and flow, and adopting a parking seal structure, the problem of wear of the pump shaft and sealing elements is solved, and low-cost operation without cooling and lubrication devices is achieved.
Patent Information
- Application Number
- CN202422614315.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-10-29
AI Technical Summary
The intense friction between the existing centrifugal pumps between the pump shaft and the sealing element causes wear and failure of the sealing surface, increasing the cost of use, and requiring cooling and lubrication devices to prevent sealing failure.
The back blade and screw part structure are adopted to prevent leakage and flow by centrifugal force, and the parking seal structure prevents leakage when the pump shaft stops or slows down, eliminating cooling and lubrication devices.
Effectively prevent leakage, reduce the cost of centrifugal pumps, and avoid the need for cooling and lubrication devices.
Smart Images
Figure CN223293902U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a centrifugal pump. Background Art
[0002] A sealing element is provided between the pump shaft and the pump body of a centrifugal pump. When the pump shaft rotates at high speed, intense friction occurs between the pump shaft and the sealing element, causing wear of the sealing element. The sealing surface will heat up and accelerate aging, causing the seal to fail. To prevent seal failure, cooling and lubrication measures need to be taken. These supporting measures increase the cost of using the centrifugal pump. Utility Model Content
[0003] In view of the above problems, the present invention proposes a high-speed centrifugal pump, which can avoid wear of the sealing surface without cooling and lubricating devices.
[0004] The technical solution of the present utility model is a high-speed centrifugal pump, which includes a pump body 4, an inlet 1 is provided on the left portion of the pump body, an outlet 5 is provided on the upper portion of the pump body, a pump cover 7 is connected to the right portion of the pump body, a pump shaft 9 passes through the pump cover and enters the pump body, and an impeller 3 is connected to the left end of the pump shaft. The utility model is characterized in that a plurality of radial back blades 6 are symmetrically provided on the rear cover plate of the impeller, a sleeve 8 extends to the right from the center portion of the right end surface of the pump cover, a screw portion 15 is provided in the middle portion of the pump shaft, the screw portion is located in the sleeve, and a parking seal structure is provided between the right end of the sleeve and the pump shaft.
[0005] When the impeller rotates, the centrifugal force generated by the impeller's rotation propels the liquid toward the outlet. Due to the gap between the impeller and the pump cover, the outlet liquid, which is under a certain pressure, will inevitably leak through this gap. With the back vanes installed, this leaked liquid will also be affected by the centrifugal force, generating reverse centrifugal pressure to prevent the leaked liquid from flowing toward the shaft seal. However, this cannot completely prevent leakage. The screw's function is to push the remaining leaked liquid from the right to the left, completely preventing leakage. The parking seal structure prevents leakage when the pump shaft stops or slows down.
[0006] The beneficial effects of the present invention are that the dynamic seal is adopted to effectively prevent leakage, there is no contact between the pump shaft and the pump cover, cooling and lubrication devices can be omitted, and the use cost of the centrifugal pump can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 It is a structural diagram of the present utility model.
[0008] Figure symbols: 1-inlet, 2-support sleeve, 3-impeller, 4-pump body, 5-outlet, 6-back blade, 7-outlet, 8-sleeve, 9-pump shaft, 10-flexible sealing ring plate, 11-support ring plate, 12-sealing ring, 13-bolt, 14-pressure ring plate, 15-screw part, 16-rib plate. DETAILED DESCRIPTION
[0009] A high-speed centrifugal pump includes a pump body 4, an inlet 1 is provided on the left side of the pump body, an outlet 5 is provided on the upper part of the pump body, a pump cover 7 is connected to the right side of the pump body, a pump shaft 9 passes through the pump cover and enters the pump body, and an impeller 3 is connected to the left end of the pump shaft. The pump is characterized in that a plurality of radial back blades 6 are symmetrically provided on the rear cover plate of the impeller, a sleeve 8 extends to the right from the center of the right end surface of the pump cover, a screw portion 15 is provided in the middle of the pump shaft, the screw portion is located in the sleeve, and a parking seal structure is provided between the right end of the sleeve and the pump shaft.
[0010] The thread of the screw part is a trapezoidal thread or a square thread.
[0011] The number of dorsal blades is 6-8.
[0012] The parking seal structure described above can be a fly iron parking seal structure, or it can adopt a structure comprising a flexible sealing ring plate 10, a support ring plate 11, and a compression ring plate 14. The flexible sealing ring plate and the support ring plate are sleeved on the pump shaft. The flexible sealing ring plate is in contact with the flange at the right end of the sleeve. The right side of the flexible sealing ring plate is in contact with the compression ring plate 14. The compression ring plate is connected to the flange at the right end of the sleeve via bolts 13. The inner diameters of the flexible sealing ring plate and the support ring plate are both smaller than the inner diameter of the sleeve. A sleeve extends to the right of the support ring plate. A sealing ring 11 is provided between the sleeve and the pump shaft. The sleeve is fixed to the pump shaft. The inner circumference of the compression ring plate 14 is larger than the outer circumference of the support ring plate.
[0013] The principle is that when the pump shaft rotates, negative pressure is formed on the left side of the flexible sealing ring plate, and the atmospheric pressure causes a gap to form between the flexible sealing ring plate and the clamping ring plate. There is no friction between the flexible sealing ring plate and the clamping ring plate. When the pump shaft stops or slows down, the pressure of the liquid in the pump body causes the flexible sealing ring plate to stick to the supporting ring plate, thus achieving parking seal.
[0014] In order to improve the stability of the impeller operation, a support sleeve 2 is provided between the left end of the impeller and the pump body. The support sleeve can prevent the impeller from shaking when rotating, and also prevent the high-pressure fluid at the outlet from flowing back to the inlet.
[0015] In order to improve the strength of the sleeve 8, a plurality of triangular ribs 16 are provided between the sleeve surface and the right end face of the pump cover.
Claims
1. A high-speed centrifugal pump comprising a pump body (4), a pump cover (7) connected to the right side of the pump body, a pump shaft (9) passing through the pump cover and entering the pump body, and an impeller (3) connected to the left end of the pump shaft, wherein: A plurality of radial back blades (6) are symmetrically provided on the rear cover of the impeller, a sleeve (8) is extended to the right from the center of the right end surface of the pump cover, a screw portion (15) is provided in the middle of the pump shaft, the screw portion is located in the sleeve, and a parking seal structure is provided between the right end of the sleeve and the pump shaft.
2. The high-speed centrifugal pump according to claim 1, characterized in that: The thread of the screw part is a trapezoidal thread or a square thread.
3. The high-speed centrifugal pump according to claim 1, wherein: The number of the back blades is 6-8.
4. The high-speed centrifugal pump according to claim 1, wherein: The parking seal structure includes a flexible sealing ring plate (10), a supporting ring plate (11), and a pressing ring plate (14). The flexible sealing ring plate and the supporting ring plate are sleeved on the pump shaft. The flexible sealing ring plate is in contact with the flange at the right end of the sleeve. The right side of the flexible sealing ring plate is in contact with the pressing ring plate (14). The pressing ring plate is connected to the flange at the right end of the sleeve by bolts (13). The inner diameters of the flexible sealing ring plate and the supporting ring plate are both smaller than the inner diameter of the sleeve. A sleeve is extended to the right of the supporting ring plate. A sealing ring (12) is provided between the sleeve and the pump shaft. The sleeve is fixed to the pump shaft.
5. The high-speed centrifugal pump according to claim 1, wherein: A plurality of triangular ribs (16) are provided between the sleeve surface and the right end surface of the pump cover.