Submersible sewage pump cooling structure

Abstract

The utility model relates to a submersible sewage pump cooling structure, which is characterized in that a sewage pump comprises a motor and an oil chamber, an auxiliary impeller is arranged on a pump shaft, the auxiliary impeller is inserted into the oil chamber, a cooling medium is filled in the oil chamber, an outer cooling water jacket is arranged on the outer side of a motor shell, and a cooling cavity is formed between the shell and the outer cooling water jacket; the oil chamber is fixedly connected with an inner circulation pipe, the inner circulation pipe extends into the cooling cavity from the position close to the auxiliary impeller of the oil chamber, the part, located in the cooling cavity, of the inner circulation pipe extends in the length direction of the motor shell, and an oil return opening communicated with the cooling cavity is formed in the side wall of the oil chamber. According to the utility model, a cooling medium inlet and return layered transmission mode is adopted, so that the self-circulation of the cooling medium is realized, the flowing time of the cooling medium is prolonged, the temperature difference of the cooling medium in the circulation process is improved, and a satisfactory heat dissipation and cooling effect can be achieved.

Description

Technical Field

[0001] The utility model relates to a cooling structure of a submersible sewage pump, belonging to the technical field of sewage pumps. Background Art

[0002] Because submersible sewage pumps typically require long-term operation, the motor is prone to overheating, causing faults such as coil burnout or tripping. Consequently, the equipment cannot continue to operate, failing to meet the requirements of the sewage treatment process and even directly burning the pump. The traditional solution to this problem is to install a cooling water jacket on the outside of the motor, forming a cooling channel between the motor housing and the jacket, and allowing the conveying medium to flow into the cooling channel to cool the motor. However, because the conveying medium of submersible sewage pumps is sewage containing a large amount of sludge and other debris, when the medium particles are large or the mud and sand concentration in the sewage is high, the sewage accumulates in the cooling channel for a long time and forms sediments. The cooling channel will be blocked by the sludge and other debris in the sewage, making it impossible for the motor to dissipate heat, affecting normal operation.

[0003] In addition, since the water level in the sewage pool is constantly changing, the sewage pump may operate at a low water level, and the motor part cannot be completely immersed in the water or only a very small part is immersed in the water. Even with the changes in sewage treatment requirements, in many cases, submersible pumps need to be installed dry. At this time, the motor is exposed to the air. When the submersible pump is running, the conveying medium cannot cool the motor, resulting in poor cooling effect of the motor, causing the motor winding temperature to rise too high, resulting in motor burnout.

[0004] The applicant discovered that Chinese patent application number CN215566664U discloses a novel amphibious, self-circulating, dual-cooled submersible sewage pump. This pump comprises an oil chamber with a flow channel and an open, forced-circulation impeller mounted on the motor shaft. During operation, the forced-circulation impeller transports cooling oil from the lower portion of the oil chamber to the upper portion of the submersible motor, thereby cooling the submersible motor and removing heat from the motor base surface. This makes the pump suitable for both amphibious and submersible use. However, the applicant discovered in practice that while this patent avoided the problem of cooling channel blockage, it pumped cooling oil upward from the right side of the oil chamber and then returned it to the oil chamber through a left-side oil return pipe. The left-side oil return pipe has a higher inlet, and during this process, the cooling oil returned to the cooling channel in a manner similar to flooding. The upwardly pumped cooling oil mixed with the cooling oil already in the cooling channel, resulting in a small temperature difference in the cooling oil, poor cooling effect, and inability to fully utilize the cooling function of the cooling oil. Therefore, improvements were necessary. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide a submersible sewage pump cooling structure with better cooling and heat dissipation effects.

[0006] In order to solve the above technical problems, the technical solution proposed by the utility model is: a submersible sewage pump cooling structure, the sewage pump includes a motor and an oil chamber, an auxiliary impeller is installed on the pump shaft, the auxiliary impeller is inserted into the oil chamber, the oil chamber is filled with a cooling medium, an outer cooling water jacket is provided on the outside of the motor housing, and a cooling chamber is formed between the housing and the outer cooling water jacket; an inner circulation pipe is fixedly connected to the oil chamber, the inner circulation pipe extends from near the auxiliary impeller of the oil chamber to the cooling chamber, the part of the inner circulation pipe located in the cooling chamber extends along the length direction of the motor housing, and an oil return port connected to the cooling chamber is provided on the side wall of the oil chamber.

[0007] When the utility model is in use, the cooling medium is transported from the oil chamber to the cooling cavity through the auxiliary impeller and the internal circulation pipe, and then flows back to the oil chamber from the return oil port. When the cooling medium circulates to the bottom of the oil chamber, heat exchange is performed with the external transport medium through the bottom of the oil chamber, thereby adopting the method of cooling medium inlet and return layered transmission to achieve autonomous circulation of the cooling medium, extend the flow time of the cooling medium, increase the temperature difference of the cooling medium during the circulation process, reduce the power consumption of the auxiliary impeller, and achieve a satisfactory heat dissipation and cooling effect. The utility model is not only suitable for traditional vertically mounted submersible sewage pumps, but is also more suitable for horizontally mounted submersible sewage pumps. Therefore, compared with the existing technology that can only be applied to vertically mounted submersible sewage pumps, the utility model has expanded its scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present invention will be further described below with reference to the accompanying drawings.

[0009] Figure 1 It is a structural schematic diagram of an embodiment of the present utility model.

[0010] Figure numerals: 1. Motor; 2. Auxiliary impeller; 3. External cooling water jacket; 4. Internal circulation pipe; 5. Bottom shell; 6. Cooling chamber; 7. Pump shaft; 8. Oil chamber; 9. Casing; 10. Oil return port. DETAILED DESCRIPTION

[0011] The cooling structure of the submersible sewage pump of this embodiment is as follows: Figure 1 As shown, the sewage pump includes a motor 1 and an oil chamber 8. An auxiliary impeller 2 is installed on the pump shaft 7. The auxiliary impeller 2 is inserted into the oil chamber 8. The oil chamber 8 is filled with a cooling medium ( Figure 1 The cooling medium is schematically shown as a corrugated filler distributed in the oil chamber 8, the cooling cavity 6 and the inner circulation pipe 4). An external cooling water jacket 3 is provided on the outside of the housing 9 of the motor 1, and a cooling cavity 6 is formed between the housing 9 and the external cooling water jacket 3.

[0012] The oil chamber 8 is fixedly connected to an inner circulation pipe 4, which extends from the vicinity of the auxiliary impeller 2 in the oil chamber 8 into the cooling chamber 6. The portion of the inner circulation pipe 4 located within the cooling chamber 6 extends along the length of the motor 1 housing 9. An oil return port 10 communicating with the cooling chamber 6 is provided on the sidewall of the oil chamber 8. Driven by the pump shaft 7, the auxiliary impeller 2 rotates, thereby driving the cooling medium in the oil chamber into the inner circulation pipe 4 and then into the cooling chamber 6 to cool the motor.

[0013] The bottom shell 5 of the oil chamber 8 also serves as a heat dissipation base. When the cooling medium circulates to the bottom of the oil chamber 8 of the water pump, heat is exchanged with external media such as sewage through the bottom shell 5, thereby achieving a satisfactory heat dissipation effect. Preferably, the bottom shell 5 is provided with heat sinks (not shown) to enhance the heat dissipation and cooling effect.

[0014] During use, the cooling medium enters the cooling cavity 6 from the oil chamber 8 through the inner circulation pipe 4, and then flows back to the oil return port 10 through the oil return port 10. The length of the inner circulation pipe 4 is basically consistent with the length of the motor 1 shell. Therefore, the returning cooling medium transfers the heat of the motor 1 shell to the oil chamber 8. When the cooling medium circulates to the bottom of the oil chamber 8 of the water pump, it exchanges heat with external sewage and other media through the bottom shell 5.

[0015] Preferably, a cooling medium filling port is provided on the cooling chamber 6 to facilitate adding or replenishing the cooling medium. The cooling medium can be common cooling oil, and in this embodiment, ethylene glycol coolant is preferably used to better meet the cooling requirements.

[0016] In order to further improve the heat dissipation effect, preferably, there are multiple inner circulation pipes 4 distributed at intervals around the motor 1 housing 9; similarly, there are multiple oil return ports 10, matching the number of inner circulation pipes 4.

[0017] The utility model adds an auxiliary impeller 2 to the pump shaft to allow the cooling medium to circulate independently, and adopts a layered manner to extend the flow time of the cooling medium, improve the cooling effect, and is more suitable for horizontal installation of submersible sewage pumps.

Claims

1. A cooling structure for a submersible sewage pump, the sewage pump comprising a motor and an oil chamber, an auxiliary impeller being mounted on the pump shaft of the sewage pump, the auxiliary impeller being inserted into the oil chamber, the oil chamber being filled with a cooling medium, an outer cooling water jacket being arranged on the outer side of the motor housing, a cooling chamber being formed between the housing and the outer cooling water jacket; characterized in that: The oil chamber is fixedly connected with an inner circulation pipe, which extends from the vicinity of the auxiliary impeller of the oil chamber to the cooling cavity. The part of the inner circulation pipe located in the cooling cavity extends along the length direction of the motor housing. The side wall of the oil chamber is provided with an oil return port connected to the cooling cavity.

2. The submersible sewage pump cooling structure according to claim 1, characterized in that: The bottom shell of the oil chamber is provided with heat sinks.

3. The submersible sewage pump cooling structure according to claim 1 or 2, characterized in that: The cooling cavity is provided with a cooling medium filling port.

4. The submersible sewage pump cooling structure according to claim 1 or 2, characterized in that: The cooling medium is ethylene glycol coolant.

5. The submersible sewage pump cooling structure according to claim 1 or 2, characterized in that: There are a plurality of inner circulation pipes, which are distributed at intervals around the motor housing.

6. The submersible sewage pump cooling structure according to claim 1, characterized in that: There are multiple oil return ports, matching the number of the internal circulation pipes.

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