Axial force balancing structure of submerged electric pump
By designing an axial force balancing structure in the submersible electric pump and optimizing the high-pressure water flow path using the guide cone sleeve and outlet section, the problems of service life and maintenance costs caused by excessive axial force are solved, and effective axial force balance and stable operation of the pump are achieved.
Patent Information
- Application Number
- CN202422709961.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2034-11-07
AI Technical Summary
The existing submersible electric pump's shaft head is subject to a large axial force generated by water pressure, exceeding the load limit of the motor thrust bearing, affecting service life and increasing maintenance costs. Existing solutions are expensive and cannot meet the needs of all users.
The axial force balance structure is adopted. Through the design of the guide cone sleeve and the outlet section, the flow path of high-pressure water in the pump is optimized, the water pressure on the shaft head is reduced, and the high and low pressure sides are separated by the sealed bearing shell and the sealed bearing sleeve to reduce the axial force.
It effectively reduces the axial force of the shaft head, extends service life, reduces maintenance costs, meets various user needs, and improves the operating stability and durability of the pump.
Smart Images
Figure CN223318106U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of submersible electric pumps, in particular to an axial force balancing structure of a submersible electric pump. Background Art
[0002] Submersible electric pump is a special type of pump, mainly used to extract liquid from deep wells, pools, rivers and underwater environments of the ocean. The submersible electric pump drives the pump shaft to rotate through the motor, driving the impeller to rotate at high speed. The rotation of the impeller generates centrifugal force, so that the liquid is sucked into the pump body and pressed out of the pump body under the action of centrifugal force, thereby realizing liquid transportation. The submersible electric pump shaft is a key component in the submersible electric pump.
[0003] The function of the submersible electric pump shaft is to serve as the key path for power transmission, bear various loads and ensure the operation accuracy of the pump. The submersible electric pump shaft plays a vital role in the submersible electric pump and is one of the core components to ensure the normal operation of the electric pump.
[0004] In the prior art, the axial force generated by the water pressure on the pump shaft head of the submersible electric pump is relatively large, exceeding the stress limit of the submersible motor thrust bearing, affecting the service life and increasing the use and maintenance costs. Existing solutions include using imported high-load thrust bearings to improve the load-bearing capacity of the motor thrust bearings, but the cost is high and there is a load limit. Another solution is to use a high-strength pump shaft to reduce the pump shaft diameter. By reducing the stress area of the shaft head, the axial force of the shaft head is reduced, but the cost is high. In summary, the existing methods cannot meet the needs of all users, thereby reducing the service life and increasing the maintenance cost. Utility Model Content
[0005] In order to make up for the above deficiencies, the present invention provides an axial force balancing structure for a submersible electric pump, aiming to improve the problem that the existing technology cannot meet the needs of all users.
[0006] In order to achieve the above-mentioned purpose, the present utility model adopts the following technical solution: a submerged electric pump axial force balancing structure, including a shaft body, a shaft head sealing cavity is provided on the water outlet side of the shaft body, a sealing bearing sleeve is installed on the rear side of the shaft body, a sealing bearing sleeve is provided on the circular outer side of the sealing bearing sleeve, a guide cone sleeve is installed on the water inlet side of the sealing bearing sleeve, the bottom of the guide cone sleeve is the high-pressure side, and a drain pipe is installed on the front side of the shaft head sealing cavity.
[0007] As a further description of the above technical solution:
[0008] An impeller is installed on the outer side of the shaft.
[0009] As a further description of the above technical solution:
[0010] The right end of the journal is equipped with an outlet section.
[0011] The utility model has the following beneficial effects:
[0012] In the utility model, high-pressure water passes through the guide cone sleeve and the outlet section and is then discharged from the pump outlet. A small amount of high-pressure water will pass through the gap between the guide cone sleeve and the sealing bearing shell, enter the gap between the sealing bearing shell and the sealing bearing sleeve, and then enter the shaft head sealing cavity. When the high-pressure water passes through these gaps, it overcomes the gap flow resistance and the pressure drops. In the low-pressure sealing cavity, the water pressure is close to the external environmental pressure, and the axial force of the shaft head is reduced, which can meet the needs of various users. The impeller is installed on the outside of the shaft body, thereby effectively achieving the effect of balancing the axial force. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a cross-sectional view of an axial force balancing structure of a submersible electric pump proposed by the present utility model;
[0014] Figure 2 This is an enlarged view of point A of the axial force balancing structure of a submersible electric pump proposed in the utility model.
[0015] Legend:
[0016] 1. Shaft; 2. Impeller; 3. Outlet section; 4. Guide cone sleeve; 5. Shaft head sealing chamber; 6. Sealing bearing; 7. Sealing bearing sleeve; 8. Drain pipe. DETAILED DESCRIPTION
[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0018] Reference Figure 1 and Figure 2 The utility model provides an embodiment: a submerged electric pump axial force balancing structure, including a shaft body 1, a shaft head sealing cavity 5 is provided on the water outlet side of the shaft body 1, a sealing bearing sleeve 7 is installed on the rear side of the shaft body 1, a sealing bearing bush 6 is provided on the circular outer side of the sealing bearing sleeve 7, a guide cone sleeve 4 is installed on the water inlet side of the sealing bearing bush 6, the bottom of the guide cone sleeve 4 is the high-pressure side, a drain pipe 8 is installed on the front side of the shaft head sealing cavity 5, an outlet section 3 is installed on the right end of the shaft body 1, and an impeller 2 is installed on the outer side of the shaft body 1;
[0019] Specifically, during the operation of the pump, high-pressure water is discharged from the outlet of the pump through the path of the guide cone sleeve 4 and the outlet section 3. The sealing bearing shell 6 and the sealing bearing sleeve 7 separate the high-pressure water into a high-pressure side and a low-pressure side. The inside of the shaft head sealing cavity 5 is the low-pressure side. A drain pipe 8 is installed on the front side of the shaft head sealing cavity 5, and the shaft head sealing cavity 5 is connected to the outside world through the drain pipe 8.
[0020] Working principle: During the operation of the pump, high-pressure water is discharged from the outlet of the pump through the path of the guide cone sleeve 4 and the outlet section 3. However, a small amount of high-pressure water will not be discharged directly with the mainstream, but will pass through the axial gap between the guide cone sleeve 4 and the sealing bearing 6. This gap is composed of the gap between the sealing bearing 6 and the sealing bearing sleeve 7. When high-pressure water flows here, it must overcome the flow resistance caused by the gap, which leads to a gradual decrease in water pressure. Finally, the water enters the shaft head sealing chamber 5. In the shaft head sealing chamber 5, since the water pressure has dropped to a level close to the external ambient pressure, the axial force borne by the shaft head is also reduced. By controlling the flow path and pressure changes of high-pressure water inside the pump, it can be ensured that the pump can maintain optimal performance under various working conditions, while reducing the risk of wear and leakage caused by high pressure.
[0021] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A submersible electric pump axial force balancing structure, comprising a shaft body (1), characterized in that: A shaft head sealing cavity (5) is provided on the water outlet side of the shaft body (1), a sealing bearing sleeve (7) is installed on the rear side of the shaft body (1), a sealing bearing bush (6) is provided on the outer side of the circle of the sealing bearing sleeve (7), a guide cone sleeve (4) is installed on the water inlet side of the sealing bearing bush (6), the bottom of the guide cone sleeve (4) is the high-pressure side, and a drain pipe (8) is installed on the front side of the shaft head sealing cavity (5).
2. The axial force balancing structure of a submersible electric pump according to claim 1, characterized in that: An impeller (2) is installed on the outer side of the shaft (1).
3. The axial force balancing structure of a submersible electric pump according to claim 1, characterized in that: An outlet section (3) is installed at the right end of the shaft body (1).