Vertical centrifugal pump
By setting up the back blade and sub-impeller structure in the vertical centrifugal pump, centrifugal force is used to prevent leakage of liquid from flowing to the sealing ring, the problem of easy damage to the mechanical seal is solved, and low-cost operation without flushing and filtration is achieved.
Patent Information
- Application Number
- CN202422614458.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-10-29
AI Technical Summary
When existing centrifugal pumps convey solid-containing particulate medium, mechanical seals are prone to fail due to solid particles entering the friction pair, resulting in the need of additional flushing and filtration devices to protect the sealing surface and increase the cost of use.
The vertical centrifugal pump design is adopted. The impeller rear cover is equipped with radial back blades and guide blades on the pump cover. Combined with the secondary impeller and sealing ring, centrifugal force is used to prevent leakage of liquid from flowing to the sealing ring, reduce wear of the sealing ring, and eliminate flushing and filtering devices.
Effectively prevent solid particles from entering the sealing surface, avoid violent friction on the sealing surface, reduce the risk of failure of sealing components, and reduce the cost of use.
Smart Images
Figure CN223282228U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a centrifugal pump used for conveying a medium containing solid particles. Background Art
[0002] A mechanical seal is installed between the pump shaft and the pump body of a centrifugal pump to prevent the medium from leaking along the pump shaft. When the conveyed medium contains solid particles, the mechanical seal is very detrimental to its operation. Solid particles entering the friction pair will cause severe friction on the sealing surface, leading to failure. To protect the mechanical seal, flushing measures are required to prevent solid particles from entering the friction pair. In addition, the flushing fluid must also be filtered. 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 vertical centrifugal pump, which can avoid impurities from entering the sealing surface and prevent severe friction on the sealing surface that may cause failure of the sealing element on the basis of omitting the flushing device and the filtering device.
[0004] The technical solution of the present utility model is a vertical centrifugal pump, which includes a pump body 1, an inlet 3 is provided at the lower part of the pump body, an outlet 7 is provided at the side of the pump body, a first pump cover 6 is connected to the upper part of the pump body, a pump shaft 12 passes through the first pump cover 6 and enters the pump body, and an impeller 4 is connected to the lower end of the pump shaft, which is characterized in that a plurality of radial back blades 5 are symmetrically provided on the rear cover plate of the impeller, a plurality of radial guide blades 8 are symmetrically provided on the upper end surface of the first pump cover, an auxiliary impeller is fixed on the pump shaft, the auxiliary impeller is located above the first pump cover, the auxiliary impeller is composed of a cover plate 9 and radial blades 10, and the blades are symmetrically arranged on the upper end surface of the cover plate, a barrel 14 extends upward from the edge of the first pump cover, the top of the barrel is connected to the second pump cover 11, and a sealing ring 13 is provided between the second pump cover and the pump shaft.
[0005] When the impeller rotates, the centrifugal force generated by the impeller driving the liquid to rotate throws the liquid to the outlet. Since there is a certain gap between the impeller and the first pump cover, when the impeller has no back blades, the outlet liquid with a certain pressure will inevitably leak through this gap, that is, it will flow from the high-pressure side of the outlet to the low-pressure side shaft seal (sealing ring) and cause leakage. After the back blades are set, due to the effect of the back blades, this part of the leaked liquid will also be affected by the centrifugal force and generate reverse centrifugal pressure to prevent the leakage liquid from flowing to the shaft seal; the function of the auxiliary impeller is the same as that of the back blades. The auxiliary impeller can further increase the reverse centrifugal pressure. In addition to preventing the leakage medium from flowing to the sealing ring, the auxiliary impeller and the back blades can also reduce the pressure applied to the sealing ring, greatly reducing the wear of the sealing ring. The function of the sealing ring is to prevent leakage when the pump shaft stops or slows down.
[0006] The beneficial effects of the utility model are that impurities can be prevented from entering the sealing surface, and severe friction of the sealing surface can be prevented from causing failure of the sealing element. In addition, a flushing device and a filtering device are 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-pump body, 2-support sleeve, 3-inlet, 4-impeller, 5-back blade, 6-first pump cover, 7-outlet, 8-guide vane, 9-cover plate, 10-blade, 11-second pump cover, 12-pump shaft, 13-sealing ring, 14-cylinder. DETAILED DESCRIPTION
[0009] A vertical centrifugal pump includes a pump body 1, an inlet 3 is provided at the lower part of the pump body, an outlet 7 is provided at the side of the pump body, a first pump cover 6 is connected to the upper part of the pump body, a pump shaft 12 passes through the first pump cover 6 and enters the pump body, and an impeller 4 is connected to the lower end of the pump shaft. The pump is characterized in that a plurality of radial back blades 5 are symmetrically provided on the rear cover plate of the impeller, a plurality of radial guide blades 8 are symmetrically provided on the upper end surface of the first pump cover, an auxiliary impeller is fixed on the pump shaft, the auxiliary impeller is located above the first pump cover, the auxiliary impeller is composed of a cover plate 9 and radial blades 10, and the blades are symmetrically arranged on the upper end surface of the cover plate, a barrel 14 extends upward from the edge of the first pump cover, the top of the barrel is connected to the second pump cover 11, and a sealing ring 13 is provided between the second pump cover and the pump shaft.
[0010] In order to improve the stability of the impeller operation, a sleeve is extended from the lower part of the impeller, and a support sleeve 2 is provided between the sleeve and the inlet of 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.
Claims
1. A vertical centrifugal pump comprising a pump body (1), an inlet (3) provided at the lower portion of the pump body, an outlet (7) provided at the side portion of the pump body, a first pump cover (6) connected to the upper portion of the pump body, a pump shaft (12) passing through the first pump cover (6) and entering the pump body, an impeller (4) connected to the lower end of the pump shaft, wherein: A plurality of radial back blades (5) are symmetrically provided on the rear cover of the impeller, a plurality of radial guide blades (8) are symmetrically provided on the upper end surface of the first pump cover, an auxiliary impeller is fixedly sleeved on the pump shaft, the auxiliary impeller is located above the first pump cover, the auxiliary impeller is composed of a cover plate (9) and radial blades (10), the blades (10) are symmetrically provided on the upper end surface of the cover plate, a barrel (14) extends upward from the edge of the first pump cover, the top of the barrel is connected to the second pump cover (11), and a sealing ring (13) is provided between the second pump cover and the pump shaft.
2. The vertical centrifugal pump according to claim 1, wherein: A sleeve extends from the lower portion of the impeller, and a support sleeve (2) is provided between the sleeve and the inlet portion of the pump body.