Internal cooling submersible pump
The internal circulation cooling system solves the problem of poor cooling of submersible pump motors in small or low-flow water bodies. It uses a rotor to drive the coolant circulation and a special design to improve cooling efficiency, avoid motor overheating, and extend service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG BOSHAN TIANQI PUMP FACTORY
- Filing Date
- 2025-09-01
- Publication Date
- 2026-07-21
AI Technical Summary
Existing submersible pumps have poor cooling performance when the water immersion is small or the water flow is poor, leading to overheating and damage to the motor.
The internal circulation cooling method is adopted, in which the rotor drives the coolant to circulate between cavities A, B, and C. The design of the annular boss and funnel-shaped spacer sleeve extends the coolant passage time and reduces the flow rate, forming a highly efficient internal cooling system.
This achieves effective cooling of the motor, avoids overheating damage, extends the motor's service life, and reduces the failure rate.
Smart Images
Figure CN224533007U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an internal circulation cooling submersible pump, belonging to the field of submersible pump technology. Background Technology
[0002] A submersible pump is a fluid transport device that combines an electric motor and a water pump into one unit. It utilizes the change in air pressure caused by liquid flow velocity or relies on centrifugal force and impeller rotation to lift water. The working principle of a submersible pump is as follows: the submersible motor drives the impeller of the submersible pump to rotate, creating a vacuum at the impeller inlet, which draws in water. The water generates centrifugal force under the action of the impeller blades, thereby gaining velocity energy and pressure energy. The water with a certain amount of energy passes through the guide shell, through the diffuser, and enters the next stage impeller. As the number of pump stages increases, the pressure continuously increases, and finally flows out from the pump outlet discharge pipe.
[0003] Existing submersible pumps are fully or partially immersed in water during operation, using the motor casing to directly contact the surrounding water, allowing heat to be conducted to the water through the casing and dissipated. However, this cooling method is highly dependent on the surrounding water. If the submersible pump is only partially immersed in the surrounding water, or if the surrounding water has poor flow, the motor cooling effect will be poor, which may lead to overheating and damage to the motor. Utility Model Content
[0004] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide an internal circulation cooling submersible pump that cools the motor by internal circulation, so as to ensure heat dissipation and avoid damage to the motor due to overheating.
[0005] The internal circulation cooling submersible pump of this utility model includes a rotor, an electric pump shaft, a lower bearing housing rotatably connected to the electric pump shaft, and a propeller fixed on the electric pump shaft; a connecting body is fixedly connected to one side of the lower bearing housing, and a water jacket is fixedly connected to the other side; a motor housing is fitted on the outside of the rotor, a spacer sleeve is fitted on the outside of the motor housing, and the water jacket is fitted on the outside of the spacer sleeve; a spacer plate is sandwiched between the lower bearing housing and the connecting body. The connecting body and the partition plate surround to form cavity A, the motor base and the spacer sleeve surround to form cavity B, and the spacer sleeve and the water jacket surround to form cavity C; cavities A, B, and C are all connected, and cavities A, B, and C are filled with coolant.
[0006] The technical solution of this utility model is to provide an internal circulation cooling submersible pump. The rotor rotation drives the propeller to rotate, which in turn causes the coolant in cavity A to enter cavity B, then from cavity B to cavity C, and then from cavity C back to cavity A, forming an internal circulation to cool the motor.
[0007] Preferably, the lower bearing housing and the partition plate surround to form a coolant channel, and cavity A and cavity B are connected through the coolant channel.
[0008] Preferably, the inner wall of the water jacket is provided with a plurality of annular protrusions A, and the outer wall of the spacer sleeve is provided with a plurality of annular protrusions B. The annular protrusions A and B cooperate to cause the coolant to deflect, thereby extending the coolant's passage time and improving cooling efficiency.
[0009] Preferably, the spacer sleeve is funnel-shaped to reduce the flow rate of coolant in cavities B and C, thereby further improving cooling efficiency.
[0010] Preferably, the water jacket is provided with multiple filling ports for adding coolant.
[0011] The advantages of this utility model compared with the prior art are: The internal circulation cooling submersible pump of this utility model uses the rotation of the rotor to drive the propeller, which in turn causes the coolant in cavity A to enter cavity B, then from cavity B to cavity C, and then from cavity C back to cavity A. This internal circulation method cools the motor, ensuring heat dissipation, preventing the motor from being damaged by overheating, extending the motor's service life, and reducing the failure rate. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of this utility model.
[0013] In the diagram: 1. Filling port; 2. Motor base; 3. Spacer sleeve; 4. Water jacket; 5. Electric pump shaft; 6. Lower bearing seat; 7. Spacer plate; 8. Connector; 9. Cavity A; 10. Propeller; 11. Coolant passage; 12. Annular boss B; 13. Annular boss A; 14. Rotor; 15. Cavity B; 16. Cavity C. Detailed Implementation
[0014] The present invention will be further described below with reference to specific embodiments.
[0015] like Figure 1 As shown, this embodiment is achieved through the following technical solution: It includes a rotor 14, which has an electric pump shaft 5. The electric pump shaft 5 is rotatably connected to a lower bearing seat 6, and a propeller 10, which is a small impeller, is fixed on the electric pump shaft 5. A connecting body 8 is fixedly connected to one side of the lower bearing seat 6, and a water jacket 4 is fixedly connected to the other side. A motor seat 2 is fitted on the outside of the rotor 14, and a spacer sleeve 3 is fitted on the outside of the motor seat 2. The water jacket 4 is fitted on the outside of the spacer sleeve 3. A spacer plate 7 is sandwiched between the lower bearing seat 6 and the connecting body 8. The connecting body 8 and the partition plate 7 surround to form a cavity A9, the motor base 2 and the spacer sleeve 3 surround to form a cavity B15, and the spacer sleeve 3 and the water jacket 4 surround to form a cavity C16; the cavities A9, B15 and C16 are all connected, and the cavities A9, B15 and C16 are filled with coolant.
[0016] In this embodiment, the lower bearing seat 6 and the partition plate 7 surround to form a coolant channel 11, and cavities A9 and B15 are connected through the coolant channel 11. The lower bearing seat 6 also has a through hole for connecting cavities A9 and C16. The inner wall of the water jacket 4 is provided with several annular protrusions A13, and the outer wall of the spacer sleeve 3 is provided with several annular protrusions B12. The annular protrusions A13 and B12 cooperate to deflect the coolant, thereby extending the coolant's flow time and improving cooling efficiency. The spacer sleeve 3 is funnel-shaped to reduce the coolant's flow velocity in cavities B15 and C16, further improving cooling efficiency. The water jacket 4 is provided with multiple filling ports 1 for adding coolant.
[0017] The method of using this utility model is as follows: The rotor 14 drives the electric pump shaft 5 to rotate, which in turn drives the propeller 10 to rotate. The coolant in cavity A9 is pushed by the propeller 10, passes through the partition plate 7, enters cavity B15 along the coolant channel 11, cools the surface of the motor housing 2 and carries away the heat, and then enters cavity C16, where the heat is dissipated to the outside through the water jacket 4. Finally, the coolant flows back to cavity A9 through the through hole on the lower bearing housing 6, and dissipates heat to the outside again through the bottom and circumferential surface of the connector 8, reducing the coolant temperature and forming an internal cooling circulation system.
[0018] Of course, the above description is only a preferred embodiment of this utility model and should not be considered as limiting the scope of the embodiments of this utility model. This utility model is not limited to the above examples, and all equivalent changes and improvements made by those skilled in the art within the scope of this utility model should be included in the patent coverage of this utility model.
Claims
1. An internal circulation cooling submersible pump, characterized in that, The device includes a rotor (14), which is equipped with an electric pump shaft (5). The electric pump shaft (5) is rotatably connected to a lower bearing seat (6), and a thruster (10) is fixed on the electric pump shaft (5). A connecting body (8) is fixedly connected to one side of the lower bearing seat (6), and a water jacket (4) is fixedly connected to the other side. A motor seat (2) is fitted on the outside of the rotor (14), and a spacer sleeve (3) is fitted on the outside of the motor seat (2). The water jacket (4) is fitted on the outside of the spacer sleeve (3). A spacer plate (7) is sandwiched between the lower bearing seat (6) and the connecting body (8). The connecting body (8) and the partition plate (7) surround to form cavity A (9), the motor base (2) and the partition sleeve (3) surround to form cavity B (15), and the partition sleeve (3) and the water jacket (4) surround to form cavity C (16); the cavities A (9), B (15) and C (16) are all connected, and the cavities A (9), B (15) and C (16) are filled with coolant.
2. The internal circulation cooling submersible pump according to claim 1, characterized in that, The lower bearing housing (6) and the partition plate (7) surround and form a coolant channel (11), and the cavity A (9) and the cavity B (15) are connected through the coolant channel (11).
3. The internal circulation cooling submersible pump according to claim 1, characterized in that, The inner wall of the water jacket (4) is provided with several annular protrusions A (13), and the outer wall of the spacer sleeve (3) is provided with several annular protrusions B (12).
4. The internal circulation cooling submersible pump according to claim 3, characterized in that, The spacer sleeve (3) is funnel-shaped.
5. The internal circulation cooling submersible pump according to claim 3, characterized in that, The water jacket (4) is provided with multiple filling ports (1) for adding coolant.