Motor cooling structure of an inner circulating submersible pump

Abstract

The application relates to a motor cooling structure of an inner circulation submersible pump, which comprises a motor shell, an outer cylinder is installed on the motor shell, a cooling chamber is formed between the outer cylinder and the motor shell, an inner cylinder is installed in the cooling chamber of the motor shell, a flow guide chamber is formed between the inner cylinder and the motor shell, and the flow guide chamber is communicated with the cooling chamber; a mechanical seal seat, a separation body and a pump cover are installed on the motor shell, the separation body is located between the mechanical seal seat and the pump cover, a medium backflow channel is formed between the pump cover and the separation body, a medium flow guide channel is formed between the mechanical seal seat and the separation body, a backflow hole for communicating the medium backflow channel and the cooling chamber is arranged at the bottom of the motor shell, a flow guide hole for communicating the medium flow guide channel and the flow guide chamber is arranged at the bottom of the motor shell, and a circulating impeller is arranged at the communication position of the medium flow guide channel and the medium backflow channel. The application has the effect of prolonging the service life.

Description

Technical Field

[0001] This application relates to the technical field of submersible pumps, and in particular to a motor cooling structure for an internal circulation submersible pump. Background Technology

[0002] A submersible pump is a type of pump that can operate underwater. It uses an electric motor to drive an impeller, generating suction to lift and transport water or other liquids. Its structural design and working principle enable it to operate efficiently in underwater environments, and it is widely used in agricultural irrigation, municipal drainage, industrial water supply and drainage, and water conservancy projects.

[0003] Regarding the aforementioned technologies, the submersible motor used in submersible pumps is a motor specifically designed for underwater operation. It utilizes the surrounding water for natural cooling, and although its heat dissipation performance is superior to that of ordinary motors, once removed from the liquid environment of the surrounding water, the submersible motor is prone to insufficient heat dissipation, which affects its service life. Therefore, there are certain areas for improvement. Utility Model Content

[0004] To improve service life, this application provides a motor cooling structure for an internal circulation submersible pump.

[0005] The motor cooling structure of the internal circulation submersible pump provided in this application adopts the following technical solution:

[0006] A motor cooling structure for an internal circulation submersible pump includes a motor housing, an outer cylinder mounted on the motor housing, a cooling chamber formed between the outer cylinder and the motor housing, an inner cylinder mounted on the motor housing within the cooling chamber, a flow guiding chamber formed between the inner cylinder and the motor housing, and the flow guiding chamber communicating with the cooling chamber.

[0007] An organic seal, a separator, and a pump cover are installed on the motor housing. The separator is located between the organic seal and the pump cover. A medium return channel is formed between the pump cover and the separator. A medium guide channel is formed between the organic seal and the separator. A return hole connecting the medium return channel and the cooling chamber is provided at the bottom of the motor housing. A guide hole connecting the medium guide channel and the guide chamber is provided at the bottom of the motor housing. A circulating impeller is provided at the connection between the medium guide channel and the medium return channel.

[0008] Preferably, the motor housing includes a motor housing, and an upper motor cover and a lower motor cover respectively installed at both ends of the motor housing. The two ends of the outer cylinder are installed on the upper motor cover and the lower motor cover, and the lower end of the inner cylinder abuts against the motor housing. The inner cylinder is fixed to the motor housing by screws.

[0009] Preferably, an upper sealing ring is fixedly installed on the upper end cover of the motor, and a lower sealing ring is fixedly installed on the lower end cover of the motor. The two ends of the outer cylinder are respectively welded and fixed to the upper sealing ring and the lower sealing ring.

[0010] Preferably, the bottom of the motor housing is provided with a plurality of first flow guide ports spaced apart circumferentially, and the lower end cover of the motor is provided with a plurality of second flow guide ports spaced apart circumferentially, and the first flow guide ports and the second flow guide ports are connected to form the flow guide hole.

[0011] Preferably, the bottom of the motor housing is provided with a plurality of first return ports spaced apart circumferentially, and the lower end cover of the motor is provided with a plurality of second return ports spaced apart circumferentially, and the first return ports and the second return ports are connected to form the return hole.

[0012] Preferably, the inner cylinder includes a left half shell and a right half shell that are joined together, and the edges of the left half shell and the right half shell are fixed by screws.

[0013] Preferably, the motor housing is provided with a motor cavity that carries the stator and rotor, the rotor is provided with a drive shaft, and the upper end cover and the lower end cover of the motor are provided with bearings for assembling the drive shaft. The drive shaft passes through the middle of the mechanical seal seat, the partition and the pump cover respectively.

[0014] Preferably, the mechanical seal base is provided with an inner mechanical seal for assembling the drive shaft.

[0015] Preferably, the middle part of the separator is provided with a communication port for connecting the medium return channel and the medium guide channel, and the circulating impeller is disposed in the communication port and assembled on the drive shaft.

[0016] Preferably, the middle part of the pump cover protrudes and extends towards one side of the partition to form a mechanical seal mounting position, and an outer mechanical seal for assembling the drive shaft is provided in the mechanical seal mounting position.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] 1. The motor cooling structure in this application can achieve efficient heat dissipation. It adopts a "full in, full out" cooling form. The cooling medium flows into the cooling chamber at high speed from the guide chamber. The cooling medium temperature enters the medium return channel from the cooling chamber for cooling. This increases the heat exchange area and improves the convection velocity, thereby improving heat dissipation efficiency and reducing the temperature rise of the motor housing.

[0019] 2. The motor cooling structure of the internal circulation submersible pump in this application does not rely on external water cooling, making it suitable for complex water quality environments such as sewage, mud, and corrosive liquids, thereby reducing the failure rate and extending the service life. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the first structure of the motor cooling system.

[0021] Figure 2 This is a schematic diagram of the second structure of the motor cooling system.

[0022] Figure 3 This is a schematic diagram of the inner cylinder.

[0023] Figure 4 This is a schematic diagram of the motor housing.

[0024] Figure 5 This is a schematic diagram of the structure of the lower end cover of the motor.

[0025] Figure 6 This is a schematic diagram of the pump cover installation.

[0026] Figure 7 This is a cross-sectional view of the pump cover.

[0027] Explanation of reference numerals in the attached drawings: 1. Motor housing; 101. Motor housing; 102. Upper motor cover; 103. Lower motor cover; 104. Upper sealing ring; 105. Lower sealing ring; 2. Outer cylinder; 3. Inner cylinder; 4. Cooling chamber; 5. Flow guiding chamber; 6. Mechanical seal seat; 7. Separator; 8. Pump cover; 9. Medium return channel; 10. Medium flow guiding channel; 11. Connecting port; 12. Circulating impeller; 13. Return hole; 131. First return port; 132. Second return port; 14. Flow guiding hole; 141. First flow guiding port; 142. Second flow guiding port; 15. Stator; 16. Rotor; 17. Drive shaft; 18. Inner mechanical seal; 19. Mechanical seal mounting position; 20. Outer mechanical seal. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0029] A motor cooling structure for an internal circulation submersible pump, referring to Figure 1 and Figure 2 As shown, it includes a motor housing 1, an outer cylinder 2, and an inner cylinder 3. The outer cylinder 2 is installed outside the motor housing 1, and a cooling chamber 4 is formed between the outer cylinder 2 and the motor housing 1. The inner cylinder 3 is installed inside the cooling chamber 4 of the motor housing 1, and a flow guiding chamber 5 is formed between the inner cylinder 3 and the motor housing 1. The flow guiding chamber 5 is connected to the cooling chamber 4.

[0030] Specifically, the motor housing 1 includes a motor housing 101, an upper motor cover 102, and a lower motor cover 103. The upper motor cover 102 is installed on the upper end of the motor housing 101 via a flange, and the lower motor cover 103 is installed on the lower end of the motor housing 101 via a flange.

[0031] The outer cylinder 2 is welded and fixed at both ends with an upper sealing ring 104 and a lower sealing ring 105 respectively. The outer cylinder 2 is fitted outside the motor housing 101. The upper sealing ring 104 is locked to the upper end cover 102 of the motor by bolts, and the lower sealing ring 105 is pressed against or welded to the lower end cover 103 of the motor.

[0032] The cooling chamber 4 is formed by the upper sealing ring 104, the outer cylinder 2, and the motor housing 101.

[0033] The bottom of the motor housing 101 is provided with an insert groove, and the lower end of the inner cylinder 3 abuts in the insert groove of the motor housing 101. The inner cylinder 3 is fixed to the motor housing 101 by screws. A narrow flow guide chamber 5 is formed between the inner cylinder 3 and the motor housing 101. The upper end of the inner cylinder 3 forms a communication space between the flow guide chamber 5 and the cooling chamber 4, so that the cooling medium passing through the flow guide chamber 5 can enter the cooling chamber 4 through the upper end of the inner cylinder 3.

[0034] It is worth noting that, referring to Figure 3 As shown, the inner cylinder 3 includes a left half shell and a right half shell that are joined together, and the edges of the left half shell and the right half shell are fixed by screws.

[0035] Reference Figure 6 and Figure 7 As shown, a mechanical seal seat 6 is installed on the motor housing 1 via a flange, and a partition 7 is installed on the mechanical seal seat 6 via bolts. A pump cover 8 is installed on the motor housing 1 via a flange. The partition 7 is located between the mechanical seal seat 6 and the pump cover 8. A medium return channel 9 is formed between the pump cover 8 and the partition 7, and a medium guide channel 10 is formed between the mechanical seal seat 6 and the partition 7. A connecting port 11 for connecting the medium return channel 9 and the medium guide channel 10 is provided in the middle of the partition 7. A circulating impeller 12 is provided at the connection point between the medium guide channel 10 and the medium return channel 9, that is, the circulating impeller 12 is located in the connecting port 11 of the partition 7.

[0036] The width of the medium return channel 9 is evenly distributed between the inner wall of the pump cover 8 and the outer wall of the partition 7. The width of the medium return channel 9 can be evenly set at various positions, that is, the width between the side wall of the pump cover 8 and the side wall of the partition 7, and the width between the bottom of the partition 7 and the inner bottom surface of the pump cover 8 are the same or similar.

[0037] Reference Figure 2 , Figure 4 and Figure 5As shown, the bottom of the motor housing 1 is provided with a return hole 13 connecting the medium return channel 9 and the cooling chamber 4, and the bottom of the motor housing 1 is provided with a guide hole 14 connecting the medium guide channel 10 and the guide chamber 5. A plurality of first guide ports 141 are spaced apart circumferentially on the bottom of the motor housing 101, and a plurality of second guide ports 142 are spaced apart circumferentially on the lower end cover 103 of the motor. The first guide ports 141 and the second guide ports 142 are connected to form the guide hole 14. Similarly, a plurality of first return ports 131 are spaced apart circumferentially on the bottom of the motor housing 101, and a plurality of second return ports 132 are spaced apart circumferentially on the lower end cover 103 of the motor. The first return ports 131 and the second return ports 132 are connected to form the return hole 13.

[0038] The motor housing 101 has a motor cavity that carries the stator 15 and the rotor 16. The rotor 16 is equipped with a drive shaft 17. The upper end cover 102 and the lower end cover 103 of the motor are equipped with bearings for assembling the drive shaft 17. The drive shaft 17 passes through the middle of the mechanical seal seat 6, the partition 7 and the pump cover 8 respectively.

[0039] An inner mechanical seal 18 for mounting a drive shaft 17 is provided on the mechanical seal seat 6. The drive shaft 17 passes through the communication port 11 of the partition body 7. The circulating impeller 12 is located in the communication port 11 and mounted on the drive shaft 17. The middle part of the pump cover 8 protrudes and extends to one side of the partition body 7 to form a mechanical seal mounting position 19. An outer mechanical seal 20 for mounting a drive shaft 17 is provided in the mechanical seal mounting position 19.

[0040] The motor cooling structure in this application can achieve efficient heat dissipation. It adopts an "all-in, all-out" cooling method. The cooling medium flows at high speed from the guide chamber 5 into the cooling chamber 4, and then enters the medium return channel 9 from the cooling chamber 4 for cooling. This increases the heat exchange area and improves the convection velocity, thereby improving heat dissipation efficiency and reducing the temperature rise of the motor housing 1.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A motor cooling structure of an inner circulating submersible pump, characterized by, The device includes a motor housing (1), an outer cylinder (2) mounted on the motor housing (1), a cooling chamber (4) formed between the outer cylinder (2) and the motor housing (1), an inner cylinder (3) installed in the cooling chamber (4) of the motor housing (1), a flow guiding chamber (5) formed between the inner cylinder (3) and the motor housing (1), and the flow guiding chamber (5) is connected to the cooling chamber (4). An organic seal seat (6), a partition (7), and a pump cover (8) are installed on the motor housing (1). The partition (7) is located between the organic seal seat (6) and the pump cover (8). A medium return channel (9) is formed between the pump cover (8) and the partition (7). A medium guide channel (10) is formed between the organic seal seat (6) and the partition (7). A return hole (13) connecting the medium return channel (9) and the cooling chamber (4) is provided at the bottom of the motor housing (1). A guide hole (14) connecting the medium guide channel (10) and the guide chamber (5) is provided at the bottom of the motor housing (1). A circulating impeller (12) is provided at the connection between the medium guide channel (10) and the medium return channel (9).

2. The motor cooling structure of an inner-loop submersible pump according to claim 1, characterized in that: The motor housing (1) includes a motor housing (101), and an upper motor cover (102) and a lower motor cover (103) respectively installed at both ends of the motor housing (101). The two ends of the outer cylinder (2) are installed on the upper motor cover (102) and the lower motor cover (103). The lower end of the inner cylinder (3) abuts against the motor housing (101). The inner cylinder (3) is fixed to the motor housing (101) by screws.

3. The motor cooling structure of an internal circulation submersible pump according to claim 2, characterized in that: An upper sealing ring (104) is fixedly installed on the upper end cover (102) of the motor, and a lower sealing ring (105) is fixedly installed on the lower end cover (103) of the motor. The two ends of the outer cylinder (2) are respectively welded and fixed to the upper sealing ring (104) and the lower sealing ring (105).

4. The motor cooling structure of an internal circulation submersible pump according to claim 2, characterized in that: The bottom of the motor housing (101) is provided with a plurality of first flow guide ports (141) spaced apart along the circumference, and the lower end cover (103) of the motor is provided with a plurality of second flow guide ports (142) spaced apart along the circumference. The first flow guide ports (141) and the second flow guide ports (142) are connected to form the flow guide hole (14).

5. The motor cooling structure of an internal circulation submersible pump according to claim 2, characterized in that: The bottom of the motor housing (101) is provided with a plurality of first return ports (131) spaced apart along the circumference, and the lower end cover (103) of the motor is provided with a plurality of second return ports (132) spaced apart along the circumference. The first return ports (131) and the second return ports (132) are connected to form the return hole (13).

6. The motor cooling structure of an internal circulation submersible pump according to claim 1, characterized in that: The inner cylinder (3) includes a left half shell and a right half shell that are joined together, and the edges of the left half shell and the right half shell are fixed by screws.

7. The motor cooling structure of an internal circulation submersible pump according to claim 2, characterized in that: The motor housing (101) is provided with a motor cavity that carries the stator (15) and the rotor (16). The rotor (16) is provided with a drive shaft (17). The upper end cover (102) and the lower end cover (103) of the motor are provided with bearings for assembling the drive shaft (17). The drive shaft (17) passes through the middle of the mechanical seal seat (6), the partition (7) and the pump cover (8).

8. The motor cooling structure of an internal circulation submersible pump according to claim 7, characterized in that: The mechanical seal base (6) is provided with an inner mechanical seal (18) for mounting the drive shaft (17).

9. The motor cooling structure of an internal circulation submersible pump according to claim 7, characterized in that: The middle part of the separator (7) is provided with a communication port (11) for connecting the medium return channel (9) and the medium guide channel (10). The circulating impeller (12) is disposed in the communication port (11) and mounted on the drive shaft (17).

10. The motor cooling structure of an internal circulation submersible pump according to claim 7, characterized in that: The pump cover (8) extends protruding from the middle towards the partition (7) to form a mechanical seal mounting position (19), and an outer mechanical seal (20) for mounting the drive shaft (17) is provided in the mechanical seal mounting position (19).

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