Internal circulation submersible pump

Abstract

A motor comprises a motor shell, a front bearing seat and a rear bearing seat, the front bearing seat and the rear bearing seat are arranged at the two ends of the motor shell respectively, a stator and a rotor are arranged in the motor shell, a driving shaft is arranged on the rotor, and the two ends of the driving shaft are rotationally installed on the front bearing seat and the rear bearing seat respectively; the cooling circulation shell is installed on the front bearing seat and located outside the motor shell, the backflow installation seat is installed on the front bearing seat, a cooling circulation flow channel is formed between the cooling circulation shell and the backflow installation seat, the driving shaft penetrates through the front bearing seat and then stretches into the backflow installation seat, and the driving shaft is provided with a circulation impeller in the backflow installation seat. A liquid accumulation cavity is formed in the front bearing seat and used for being communicated with the connecting position of the front bearing seat and the driving shaft, an opening of the liquid accumulation cavity is located in the side wall face of the front bearing seat, and a water drainage flange for sealing the opening of the liquid accumulation cavity is arranged on the front bearing seat. The method and the device have the effect of reducing the maintenance period duration.

Description

Technical Field

[0001] This application relates to the technical field of submersible pumps, and more particularly to an internal circulation submersible pump. Background Technology

[0002] Submersible sewage pumps mainly use external circulating tap water to cool the motor. However, when the medium contains a lot of particles or is relatively viscous, long-term operation can cause blockages in the inlet and outlet channels of the circulating tap water, which will affect the amount of medium water and the motor's cooling effect.

[0003] Chinese patent application number 2024117706364 discloses a water pump cooling structure and a sewage pump. The water pump cooling structure includes a motor housing, a flow guide shroud, and a cooling partition. The cooling partition is installed on the outer wall of the motor housing to form a cooling chamber between the cooling partition and the motor housing. The motor housing has multiple return holes and multiple flow guide holes spaced at intervals. The return holes and flow guide holes are located at the bottom of the cooling chamber. The flow guide shroud is installed on the motor housing, and a flow guide channel is formed between the flow guide shroud and the motor housing. The flow guide holes are located within the flow guide channel.

[0004] The bottom of the motor housing is provided with a medium return cavity. Both the return hole and the guide hole are connected to the medium return cavity. An impeller is provided in the medium return cavity, and the cooling medium can flow from the return hole to the guide hole.

[0005] Regarding the aforementioned related technologies, the inventors discovered that the motor housing is divided into an upper housing and a lower housing. An organic seal seat is installed on the lower housing, and an inner organic seal is provided in the organic seal seat for assembling the motor's drive shaft. When the inner organic seal fails, the cooling medium can easily enter the motor's sealing cavity through the organic seal seat. When it is necessary to drain the cooling medium from the motor's sealing cavity, the entire organic seal seat needs to be disassembled and repaired, resulting in a long maintenance cycle. Therefore, there is room for improvement. Summary of the Invention

[0006] To reduce maintenance cycle time, this application provides an internal circulation submersible pump.

[0007] The internal circulation submersible pump provided in this application adopts the following technical solution: An internal circulation submersible pump includes a motor, a cooling circulation housing, and a return flow mounting base. The motor includes a motor housing, and a front bearing housing and a rear bearing housing respectively disposed at both ends of the motor housing. The motor housing has a stator and a rotor. A drive shaft is disposed on the rotor, and the two ends of the drive shaft are rotatably mounted on the front bearing housing and the rear bearing housing respectively. The cooling circulation housing is mounted on the front bearing housing and located outside the motor housing. The return mounting base is mounted on the front bearing housing. A cooling circulation channel is formed between the cooling circulation housing and the return mounting base. The drive shaft passes through the front bearing housing and extends into the return mounting base. A circulation impeller is mounted on the drive shaft in the return mounting base. The front bearing housing is provided with a liquid accumulation chamber, which is used to connect the front bearing housing and the drive shaft. The opening of the liquid accumulation chamber is located on the side wall of the front bearing housing, and the front bearing housing is provided with a drain flange to close the opening of the liquid accumulation chamber.

[0008] Preferably, the front bearing housing has a mounting cavity in the middle, a front bearing connected to the drive shaft is disposed in the mounting cavity, the bottom surface of the mounting cavity has a shaft through hole for the drive shaft to pass through, the front bearing housing has an inner machine seal connected to the drive shaft around the shaft through hole, and the liquid accumulation cavity is connected to the mounting cavity.

[0009] Preferably, an isolation cavity is formed between the bottom surface of the mounting cavity and the front bearing, and the front bearing seat is provided with a communication port communicating with the liquid accumulation cavity at the location of the isolation cavity.

[0010] Preferably, the bottom surface of the liquid accumulation cavity is lower than the bottom surface of the mounting cavity.

[0011] Preferably, the bottom surface of the liquid accumulation cavity is provided with a liquid storage tank.

[0012] Preferably, a first arc-shaped surface is provided between the opening of the liquid storage tank and the connecting port, and a second arc-shaped surface is provided on both sides of the bottom surface of the liquid accumulation cavity, wherein the first arc-shaped surface and the second arc-shaped surface are connected to the opening of the liquid storage tank.

[0013] Preferably, a leakage probe is provided on the front bearing housing, and the detection end of the leakage probe extends into the liquid accumulation cavity.

[0014] Preferably, the front bearing housing has a liquid collection port for connecting the interior of the motor housing with the liquid accumulation chamber.

[0015] Preferably, the cooling circulation housing includes a flow-guiding inner cylinder and a cooling housing. The flow-guiding inner cylinder is mounted on the front bearing housing and located outside the motor housing. A flow-guiding chamber is formed between the flow-guiding inner cylinder and the motor housing. The cooling housing is mounted on the front bearing housing and located outside the flow-guiding inner cylinder. A cooling chamber is formed between the cooling housing and the flow-guiding inner cylinder. The cooling chamber and the flow-guiding chamber are connected. The front bearing housing is provided with a guide hole and a return hole, and the return mounting base is provided with a medium return cavity. The guide hole is used to connect the guide cavity and the medium return cavity, and the return hole is used to connect the cooling cavity and the medium return cavity.

[0016] Preferably, the reflux mounting base includes a pump cover and a partition; The pump cover is mounted on the front bearing housing, the partition is mounted on the front bearing housing, the partition is disposed inside the pump cover, a medium return channel is formed between the partition and the pump cover, a medium guide channel is formed inside the partition, the medium guide channel is connected to the medium return channel, the medium guide channel is connected to the guide chamber through the guide hole, the medium return channel is connected to the cooling chamber through the return hole, and the circulating impeller is disposed at the connection between the medium guide channel and the medium return channel.

[0017] In summary, this application includes at least one of the following beneficial technical effects: 1. This application provides a liquid collection chamber in the front bearing housing. When the mechanical seal at the connection between the front bearing housing and the drive shaft fails, the cooling medium in the return mounting seat will first seep into the liquid collection chamber. The liquid collection chamber temporarily stores the cooling medium, preventing it from directly entering the motor. The operator only needs to open the drain flange to clean the cooling medium in the liquid collection chamber, thereby reducing the maintenance cycle time.

[0018] 2. In this application, the reflux mounting base is directly installed on the front bearing housing. When the cooling medium circulates in the cooling circulation channel, the cooling medium can directly cool the front bearing housing, thereby effectively reducing the temperature rise of the front bearing housing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the internal circulation submersible pump.

[0020] Figure 2 This is a cross-sectional schematic diagram of an internal circulation submersible pump.

[0021] Figure 3 This is a schematic diagram of the front bearing housing.

[0022] Figure 4 This is a cross-sectional schematic diagram of the front bearing housing.

[0023] Explanation of reference numerals in the attached drawings: 1. Motor; 101. Motor housing; 102. Front bearing housing; 103. Rear bearing housing; 104. Motor cavity; 105. Stator; 106. Rotor; 107. Drive shaft; 108. Guide hole; 109. Return hole; 110. Inner seal; 111. Liquid collection chamber; 112. Drain flange; 113. Flange gasket; 114. Mounting cavity; 115. Front bearing; 116. Rear bearing; 117. Shaft through hole; 118. Isolation chamber; 119. Connecting port; 12 0. Liquid storage tank; 121. First arc-shaped surface; 122. Second arc-shaped surface; 123. Leakage probe; 2. Cooling circulation shell; 201. Inner guide cylinder; 202. Cooling shell; 203. Guide chamber; 204. Cooling chamber; 3. Return mounting base; 301. Pump cover; 302. Separator; 303. Flow port; 304. Mounting through hole; 305. External seal; 4. Circulation impeller; 5. Medium return chamber; 501. Medium return channel; 502. Medium guide channel; 6. Liquid collection port. Detailed Implementation

[0024] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0025] An internal circulation submersible pump, reference Figure 1 and Figure 2 As shown, the device includes a motor 1, a cooling circulation housing 2, and a return mounting base 3. The motor 1 includes a motor housing 101 and a front bearing housing 102 and a rear bearing housing 103 respectively disposed at both ends of the motor housing 101. A motor cavity 104 is provided inside the motor housing 101. The front bearing housing 102 and the rear bearing housing 103 are installed at both ends of the motor housing 101 by screws to seal the motor cavity 104. The motor housing 101 has a stator 105 and a rotor 106. A drive shaft 107 is provided on the rotor 106. The two ends of the drive shaft 107 are rotatably mounted on the front bearing housing 102 and the rear bearing housing 103 respectively. The drive shaft 107 is mounted on the front bearing housing 102 through a front bearing 115 and on the rear bearing housing 103 through a rear bearing 116.

[0026] The cooling circulation housing 2 is mounted on the front bearing housing 102 and located outside the motor housing 101. The cooling circulation housing 2 includes a flow guide inner cylinder 201 and a cooling housing 202. The lower end of the flow guide inner cylinder 201 is mounted on the front bearing housing 102 and located outside the motor housing 101. The middle part of the flow guide inner cylinder 201 is locked to the motor housing 101 by screws. A flow guide chamber 203 is formed between the flow guide inner cylinder 201 and the motor housing 101.

[0027] The cooling housing 202 is mounted on the front bearing housing 102 by screws and is located outside the inner guide cylinder 201. The lower end of the cooling housing 202 is sealed and fixed on the front bearing housing 102, and the upper end of the cooling housing 202 is sealed and fixed on the rear bearing housing 103. A cooling chamber 204 is formed between the cooling housing 202 and the inner guide cylinder 201. The cooling chamber 204 and the guide chamber 203 are connected, and the connection point is at the top of the motor housing 101.

[0028] The reflux mounting base 3 is mounted on the front bearing housing 102. A cooling circulation channel is formed between the cooling circulation housing 2 and the reflux mounting base 3. The drive shaft 107 passes through the front bearing housing 102 and extends into the reflux mounting base 3. The drive shaft 107 is equipped with a circulation impeller 4 in the reflux mounting base 3.

[0029] The front bearing housing 102 is provided with a guide hole 108 and a return hole 109. At least one guide hole 108 and a return hole 109 are provided. The guide hole 108 and the return hole 109 are arranged at intervals in the radial direction. The return mounting seat 3 is provided with a medium return cavity 5. The guide hole 108 is used to connect the guide cavity 203 and the medium return cavity 5. The return hole 109 is used to connect the cooling cavity 204 and the medium return cavity 5.

[0030] The return mounting base 3 includes a pump cover 301 and a partition 302. The pump cover 301 is mounted on the front bearing housing 102 with screws, and the partition 302 is mounted on the front bearing housing 102 with screws. The partition 302 is located inside the pump cover 301, and the medium return chamber 5 is divided into a medium return channel 501 and a medium guide channel 502. The medium return channel 501 is formed between the partition 302 and the pump cover 301, and the medium guide channel 502 is formed inside the partition 302. The medium guide channel 502 is connected to the medium return channel 501. The medium guide channel 502 is connected to the guide chamber 203 through the guide hole 108, and the medium return channel 501 is connected to the cooling chamber 204 through the return hole 109. The circulating impeller 4 is located at the connection between the medium guide channel 502 and the medium return channel 501.

[0031] Specifically, a flow port 303 is provided in the middle of the partition 302, and a mounting through hole 304 is provided in the middle of the pump cover 301. The drive shaft 107 passes through the front bearing housing 102 and then passes through the flow port 303 of the partition 302 and the mounting through hole 304 of the pump cover 301. The flow port 303 of the partition 302 is the connection point between the medium guiding channel 502 and the medium return channel 501. The circulating impeller 4 is located at the flow port 303. The drive shaft 107 extends out from the mounting through hole 304 of the pump cover 301 to connect components such as the impeller of the internal circulation submersible pump. An external machine seal 305 is provided at the mounting through hole 304 of the pump cover 301.

[0032] The cooling circulation channel is filled with cooling medium. When the drive shaft 107 rotates, the drive shaft 107 will drive the circulation impeller 4 to rotate. The circulation impeller 4 pushes the cooling medium from the medium return channel 501 to the medium guide channel 502. The cooling medium enters the guide chamber 203 through the medium guide channel 502 and the guide hole 108. The cooling medium flows along the guide chamber 203 to cool the motor housing 101.

[0033] The cooling medium enters the cooling chamber 204 from the top of the motor housing 101 through the guide chamber 203, flows along the cooling chamber 204, enters the medium return channel 501 through the return hole 109, and is driven by the circulating impeller 4 to repeat the above process. This method enables the cooling medium to move in the cooling circulation channel, thereby cooling the heat points of the front bearing housing 102, the motor housing 101, and the rear bearing housing 103. The heat point of the front bearing housing 102 is located at the mounting point of the drive shaft 107 and the front bearing 115 of the front bearing housing 102, the stator 105 is located on the motor housing 101, and the heat point of the rear bearing housing 103 is located at the mounting point of the drive shaft 107 and the rear bearing 116 of the rear bearing housing 103.

[0034] The drive shaft 107 passes through the front bearing housing 102 and extends into the return mounting base 3. The point where the drive shaft 107 passes through the front bearing housing 102 is connected by an internal machine seal 110. The front bearing housing 102 has a liquid collection chamber 111, which connects the front bearing housing 102 to the drive shaft 107. The opening of the liquid collection chamber 111 is located on the side wall of the front bearing housing 102. A drain flange 112 is provided on the front bearing housing 102 to close the opening of the liquid collection chamber 111. A flange sealing gasket 113 is provided between the drain flange 112 and the opening of the liquid collection chamber 111 to improve the sealing between the drain flange 112 and the opening of the liquid collection chamber 111.

[0035] Reference Figure 3 and Figure 4 As shown, a mounting cavity 114 is provided in the middle of the front bearing housing 102. A front bearing 115 connected to the drive shaft 107 is provided in the mounting cavity 114. A shaft through hole 117 for the drive shaft 107 to pass through is provided on the bottom surface of the mounting cavity 114. An inner machine seal 110 connected to the drive shaft 107 is provided around the shaft through hole 117 in the front bearing housing 102. The liquid accumulation cavity 111 is connected to the mounting cavity 114.

[0036] An isolation cavity 118 is formed between the bottom surface of the mounting cavity 114 and the front bearing 115. The front bearing seat 102 has a connecting port 119 at the location of the isolation cavity 118, which communicates with the liquid accumulation cavity 111. The bottom surface of the liquid accumulation cavity 111 is lower than the bottom surface of the mounting cavity 114. A liquid storage tank 120 is provided on the bottom surface of the liquid accumulation cavity 111. A first arc-shaped surface 121 is provided between the opening of the liquid storage tank 120 and the connecting port 119. Second arc-shaped surfaces 122 are provided on both sides of the bottom surface of the liquid accumulation cavity 111. The first arc-shaped surface 121 and the second arc-shaped surface 122 are connected to the opening of the liquid storage tank 120.

[0037] A leakage probe 123 is provided on the front bearing housing 102, and the detection end of the leakage probe 123 extends into the liquid accumulation chamber 111. The end of the detection end of the leakage probe 123 is flush with the opening of the liquid storage tank 120. In one embodiment, the leakage probe 123 may be a resistive sensor, which will generate a leakage signal when it detects the cooling medium.

[0038] The front bearing housing 102 has a liquid collection port 6 for connecting the motor cavity 104 inside the motor housing 101 with the liquid accumulation chamber 111. The position of the liquid collection port 6 is opposite to the liquid storage tank 120. The liquid collection port 6 allows the cooling medium that has seeped into the motor cavity 104 to flow back from the liquid collection port 6 to the liquid accumulation chamber 111, and the leakage probe 123 detects the leakage inside the motor 1.

[0039] When the drive shaft 107 rotates at high speed, a small amount of cooling medium in the return mounting seat 3 will seep into the mounting cavity 114 of the front bearing housing 102. After being isolated by the isolation cavity 118, the cooling medium will not directly contact the front bearing 115. The cooling medium will enter the liquid accumulation cavity 111 through the connecting port 119 and flow into the liquid storage tank 120 of the liquid accumulation cavity 111. The cooling medium will be temporarily stored in the liquid storage tank 120. When the cooling medium in the liquid storage tank 120 is full, the water leakage probe 123 located at the opening of the liquid storage tank 120 will detect the presence of the cooling medium and will send a water leakage signal.

[0040] At this point, based on the leakage signal emitted by the leakage probe 123, the staff can inspect the front bearing housing 102. By opening the screws on the drain flange 112, the cooling medium can be poured out from the opening of the liquid accumulation chamber 111, avoiding the need to disassemble the entire front bearing housing 102 for inspection, thereby effectively reducing the inspection time.

[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. An internal circulation submersible pump, comprising a motor (1), a cooling circulation housing (2), and a return mounting base (3), wherein the motor (1) comprises a motor housing (101), and a front bearing housing (102) and a rear bearing housing (103) respectively disposed at both ends of the motor housing (101), wherein the motor housing (101) has a stator (105) and a rotor (106), wherein a drive shaft (107) is disposed on the rotor (106), and both ends of the drive shaft (107) are rotatably mounted on the front bearing housing (102) and the rear bearing housing (103) respectively; The cooling circulation housing (2) is mounted on the front bearing housing (102) and located outside the motor housing (101). The return mounting base (3) is mounted on the front bearing housing (102). A cooling circulation channel is formed between the cooling circulation housing (2) and the return mounting base (3). The drive shaft (107) passes through the front bearing housing (102) and extends into the return mounting base (3). A circulation impeller (4) is mounted on the drive shaft (107) in the return mounting base (3). Its features are, The front bearing housing (102) is provided with a liquid accumulation chamber (111), which is used to connect the front bearing housing (102) and the drive shaft (107). The opening of the liquid accumulation chamber (111) is located on the side wall of the front bearing housing (102). The front bearing housing (102) is provided with a drain flange (112) to close the opening of the liquid accumulation chamber (111).

2. The internal circulation submersible pump according to claim 1, characterized in that, The front bearing housing (102) has a mounting cavity (114) in the middle, and a front bearing (115) connected to the drive shaft (107) is provided in the mounting cavity (114). The bottom surface of the mounting cavity (114) has a shaft through hole (117) for the drive shaft (107) to pass through. The front bearing housing (102) has an inner machine seal (110) connected to the drive shaft (107) around the shaft through hole (117). The liquid accumulation cavity (111) is connected to the mounting cavity (114).

3. The internal circulation submersible pump according to claim 2, characterized in that, An isolation cavity (118) is formed between the bottom surface of the mounting cavity (114) and the front bearing (115), and the front bearing seat (102) is provided with a communication port (119) communicating with the liquid accumulation cavity (111) at the location of the isolation cavity (118).

4. The internal circulation submersible pump according to claim 3, characterized in that, The bottom surface of the liquid accumulation cavity (111) is lower than the bottom surface of the mounting cavity (114).

5. The internal circulation submersible pump according to claim 3, characterized in that, The bottom surface of the liquid accumulation chamber (111) is provided with a liquid storage tank (120).

6. The internal circulation submersible pump according to claim 5, characterized in that, A first arc-shaped surface (121) is provided between the opening of the liquid storage tank (120) and the communication port (119), and a second arc-shaped surface (122) is provided on both sides of the bottom surface of the liquid accumulation cavity (111). The first arc-shaped surface (121) and the second arc-shaped surface (122) are connected to the opening of the liquid storage tank (120).

7. The internal circulation submersible pump according to claim 1, characterized in that, A water leakage probe (123) is provided on the front bearing housing (102), and the detection end of the water leakage probe (123) extends into the liquid accumulation chamber (111).

8. The internal circulation submersible pump according to claim 1, characterized in that, The front bearing housing (102) is provided with a liquid collection port (6) for connecting the inside of the motor housing (101) with the liquid accumulation chamber (111).

9. The internal circulation submersible pump according to claim 1, characterized in that, The cooling circulation housing (2) includes a flow guide inner cylinder (201) and a cooling housing (202). The flow guide inner cylinder (201) is mounted on the front bearing seat (102) and located outside the motor housing (101). A flow guide chamber (203) is formed between the flow guide inner cylinder (201) and the motor housing (101). The cooling housing (202) is mounted on the front bearing seat (102) and located outside the flow guide inner cylinder (201). A cooling chamber (204) is formed between the cooling housing (202) and the flow guide inner cylinder (201). The cooling chamber (204) and the flow guide chamber (203) are connected. The front bearing housing (102) is provided with a guide hole (108) and a return hole (109). The return mounting base (3) is provided with a medium return cavity (5). The guide hole (108) is used to connect the guide cavity (203) and the medium return cavity (5). The return hole (109) is used to connect the cooling cavity (204) and the medium return cavity (5).

10. An internal circulation submersible pump according to claim 9, characterized in that, The return mounting base (3) includes a pump cover (301) and a partition (302); The pump cover (301) is mounted on the front bearing housing (102), the partition (302) is mounted on the front bearing housing (102), the partition (302) is disposed inside the pump cover (301), a medium return channel (501) is formed between the partition (302) and the pump cover (301), a medium guide channel (502) is formed inside the partition (302), the medium guide channel (502) is connected to the medium return channel (501), the medium guide channel (502) is connected to the guide chamber (203) through the guide hole (108), the medium return channel (501) is connected to the cooling chamber (204) through the return hole (109), and the circulating impeller (4) is disposed at the connection between the medium guide channel (502) and the medium return channel (501).

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