CN-224204878-U - Optimized cooling structure of dry-type installation submersible motor

CN224204878UCN 224204878 UCN224204878 UCN 224204878UCN-224204878-U

Abstract

The application relates to the field of motors, and discloses an optimized cooling structure of a dry-type installation submersible motor, which can improve the cooling efficiency of the dry-type installation submersible motor and solve the problem of too fast temperature rise of a motor bearing. Comprises a pump body, a stator, a rotor, a motor casing, a cooling jacket, a wiring seat, a connecting seat and a pump cover. The rotor shaft end passes through the connecting seat and the pump cover in turn and is connected to the pump body, the stator surrounds the outer side of the rotor, the motor casing surrounds the outer side of the stator, and two ends of the motor casing are respectively in sealing connection with the wiring seat and the connecting seat so as to form a first airtight cavity in the motor casing. The cooling jacket is sleeved outside the motor casing, and two ends of the cooling jacket are respectively connected with the wiring seat and the connecting seat in a sealing way, so that a second airtight cavity is formed between the cooling jacket and the motor casing. The second end side of the rotor is provided with an axial flow fan blade which rotates around the axis of the bearing to form air flow, the air flow flows from the second end side of the rotor to the first end side of the rotor and then flows back to the second end side to form circulating flow, and the air flow exchanges heat in the process of flowing back to the second end side from the first end side.

Inventors

ZHOU YUE
HAN FANGFANG
SUN RU
ZHANG XIMIAO

Assignees

上海连成（集团）有限公司

Dates

Publication Date: 20260505
Application Date: 20250424

Claims (10)

1. The optimized cooling structure for the dry-type installation submersible motor is characterized by comprising a pump body, a motor stator, a motor rotor, a motor shell, a cooling jacket, a wiring seat, a connecting seat and a pump cover; The end part of the motor rotor shaft sequentially penetrates through the connecting seat and the pump cover to be connected to the pump body, the motor stator surrounds the outer side of the motor rotor, the motor shell surrounds the outer side of the motor stator, and the two ends of the motor shell are respectively connected with the wire holder and the connecting seat in a sealing way, so that a first airtight cavity is formed inside the motor shell; The cooling jacket is sleeved outside the motor casing, and two ends of the cooling jacket are respectively and hermetically connected with the wiring seat and the connecting seat, so that a second airtight cavity is formed between the cooling jacket and the motor casing; the second end side of the motor rotor is provided with an axial flow fan blade, the axial flow fan blade rotates around the axis of the bearing to form air flow, the air flow flows from the second end side of the motor rotor to the first end side of the motor rotor in the first closed cavity and then flows back to the second end side to form circulating flow, and the air flow exchanges heat with a medium in the second closed cavity in the process of flowing back to the second end side from the first end side.
2. The optimized cooling structure of a dry-type mounted submersible motor as recited in claim 1, wherein a plurality of air flow guiding grooves are provided in a circumferential direction of an inner wall of the motor case, and the air flow flows into the air flow guiding grooves from the first end side, exchanges heat with a medium in the second closed chamber in the air flow guiding grooves, and then flows back to the second end side.
3. The optimized cooling configuration for a dry-mount submersible motor of claim 1, wherein the air flow is directed to the first end side through an air gap between the stator and the rotor and through punched holes in the rotor.
4. The optimized cooling structure of a dry-mounted submersible motor as recited in claim 1, further comprising a water intake pipe and a water return pipe; The first end of the water inlet pipeline stretches into the second closed cavity, the second end of the water inlet pipeline is in fluid communication with the pump body inner cavity, the first end of the water return pipeline stretches into the second closed cavity, the second end of the water return pipeline is in fluid communication with the pump body inner cavity, fluid medium in the pump body inner cavity continuously flows into the second closed cavity through the water inlet pipeline, and medium in the second closed cavity continuously flows back into the pump body inner cavity through the water return pipeline.
5. The optimized cooling structure of a dry-mounted submersible motor according to claim 1, wherein the wire holder comprises an upper wire holder flange and a lower wire holder flange, a plurality of connecting columns are arranged between the upper wire holder flange and the lower wire holder flange in the circumferential direction, a first bearing position is arranged at the axis of the wire holder, a first end of the bearing is accommodated in the first bearing position, a cavity is formed between the outer wall of the first bearing position and the outer surfaces of the upper wire holder flange and the lower wire holder flange, and a medium in the second closed cavity fills in the cavity and is in direct contact with the outer wall of the first bearing position.
6. The optimized cooling structure of a dry-type installed submersible motor according to claim 1, wherein the connecting seat comprises an upper connecting seat flange and a lower connecting seat flange, a reinforcing rib is arranged between the upper connecting seat flange and the lower connecting seat flange, the reinforcing rib is in a discontinuous ring shape, a second bearing position is arranged at the axis of the connecting seat, a second end of the bearing is accommodated in the second bearing position, a cavity is formed between the outer wall of the second bearing position and the inner wall of the reinforcing rib, and a medium in the second closed cavity fills in the cavity and is in direct contact with the outer wall of the second bearing position.
7. The optimized cooling structure of a dry-type installed submersible motor according to claim 5, wherein the connecting seat is further provided with an oil-water detection probe inlet, the oil-water detection probe penetrates through the upper flange of the connecting seat and the lower flange of the connecting seat through the oil-water detection probe inlet and stretches into a liquid leakage detection cavity in the pump cover, and the oil-water detection probe is configured to detect whether water or an oil-water mixture exists in the liquid leakage detection cavity.
8. The optimized cooling structure of a dry-mounted submersible motor according to claim 7, wherein a first-stage mechanical seal is arranged outside the bearing, the first-stage mechanical seal forms a water seal cavity with the pump cover and the pump body, and fluid in the pump body cavity enters the water seal cavity but is not in direct contact with the bearing.
9. The optimized cooling structure of a dry-mounted submersible motor according to claim 8, wherein the pump cover is provided with an oil filling port, a second-stage mechanical seal is arranged on the outer side of the bearing, the second-stage mechanical seal, the connecting seat and the pump cover form an oil seal lubrication cavity, the oil filling port is in fluid communication with the oil seal lubrication cavity, and lubricating oil enters the oil seal lubrication cavity from the oil filling port.
10. The optimized cooling structure of a dry-mounted submersible motor according to claim 9, wherein a water leakage port is formed in the connecting seat, a water outlet is formed in the pump cover, and when the first-stage mechanical seal and the second-stage mechanical seal fail, fluid in the inner cavity of the pump body enters the water seal cavity and then enters the oil seal lubrication cavity, then enters the liquid leakage detection cavity through the water leakage port, and finally is discharged through the water outlet.

Description

Optimized cooling structure of dry-type installation submersible motor Technical Field The application relates to the field of motors, in particular to an optimized cooling structure for a dry-type installation submersible motor. Background With the wide application of high-power submersible motors, particularly in water pumps and pumping systems, motor cooling technology has become a key factor in improving equipment operation stability and prolonging service life. Generally, submersible motors are divided into wet and dry installations, where high power submersible motors (power greater than 355 kW) face significant cooling problems in dry installations. Under the wet-type mounting mode, the casing of the motor is directly submerged in water, and water flows through the casing to effectively cool the motor, so that the motor can be ensured to be kept in a lower temperature range in the operation process, and damage caused by overheating is avoided. The wet mounting mode has a good cooling effect and is particularly suitable for the heat dissipation requirement of the high-power motor. However, wet mounted motors have certain limitations, such as being unable to pump the liquid level below the cabinet and not being suitable for some specific environmental conditions. The dry installation mode is to cool by adding a cooling jacket outside the casing, however, the cooling rate is limited by the air conduction performance because no water medium exists outside the cooling jacket, and the cooling effect is insufficient compared with the wet installation mode. Particularly in the operation of high-power motors, the accumulation of heat inside the motor has a great influence on the rise of bearing temperature. Too fast a bearing temperature rise not only shortens its life, but also may cause the motor to malfunction. Disclosure of Invention The application aims to provide an optimized cooling structure of a dry-type installation submersible motor, which can improve the cooling efficiency of the dry-type installation submersible motor and solve the problem of too fast temperature rise of a motor bearing. The application discloses an optimized cooling structure for a dry-type installation submersible motor, which comprises a pump body, a motor stator, a motor rotor, a motor shell, a cooling jacket, a wiring seat, a connecting seat and a pump cover, wherein the pump body is provided with a motor cover; The end part of the motor rotor shaft sequentially penetrates through the connecting seat and the pump cover to be connected to the pump body, the motor stator surrounds the outer side of the motor rotor, the motor shell surrounds the outer side of the motor stator, and the two ends of the motor shell are respectively connected with the wire holder and the connecting seat in a sealing way, so that a first airtight cavity is formed inside the motor shell; The cooling jacket is sleeved outside the motor casing, and two ends of the cooling jacket are respectively and hermetically connected with the wiring seat and the connecting seat, so that a second airtight cavity is formed between the cooling jacket and the motor casing; The second end side of the motor rotor is provided with an axial flow fan blade, the axial flow fan blade rotates around the axis of the bearing to form air flow, the air flow flows from the second end side of the motor rotor to the first end side of the motor rotor in the first closed cavity and then flows back to the second end side to form circulating flow, and the air flow exchanges heat with a medium in the second closed cavity in the process of flowing back to the second end side from the first end side. In a preferred embodiment, a plurality of air flow guide grooves are provided in the circumferential direction of the inner wall of the motor case, and the air flow flows into the air flow guide grooves from the first end side, exchanges heat with the medium in the second closed chamber in the air flow guide grooves, and then flows back to the second end side. In a preferred embodiment, the air flow flows to the first end side through an air gap between the stator and the rotor and a punched hole in the rotor. In a preferred embodiment, the length of the air flow guide slot is greater than the length of the motor stator. In a preferred embodiment, the number of air flow guide slots is 4-10. In a preferred embodiment, the device further comprises a water inlet pipeline and a water return pipeline; The first end of the water inlet pipeline stretches into the second closed cavity, the second end of the water inlet pipeline is in fluid communication with the pump body inner cavity, the first end of the water return pipeline stretches into the second closed cavity, the second end of the water return pipeline is in fluid communication with the pump body inner cavity, fluid medium in the pump body inner cavity continuously flows into the second closed cavity through the water inlet pipeline, and medi