Temperature control system for preventing friction between stator and rotor of submersible electric pump

Abstract

The invention belongs to the technical field of electric pumps, and particularly relates to a temperature control system for preventing friction between a stator and a rotor of a submersible electric pump, the temperature control system comprises a rotor assembly, a stator assembly and an electric pump shell which are longitudinally distributed and sequentially sleeved from inside to outside, a gap A is formed between the rotor assembly and the stator assembly, and a gap B is formed between the stator assembly and the electric pump shell. An upper cavity is arranged above the stator assembly, a lower cavity is arranged below the stator assembly, a closed cavity is formed among the upper cavity, the lower cavity and the stator assembly, and the upper cavity is communicated with the lower cavity through a ventilation pipe. According to the technical scheme, the temperature control system for preventing friction between the stator and the rotor of the submersible electric pump is based on the characteristics that the whole submersible electric pump is longitudinally distributed during working and water flows from bottom to top and the characteristics that hot air is distributed on the upper portion and cold air is distributed on the lower portion in the same space; and three cooling passages are arranged to control the temperature rise in the submersible electric pump, so that the condition that the rotor assembly and the stator assembly are excessively expanded to cause friction between the stator and the rotor is avoided. Meanwhile, in the technical scheme, a left-handed groove with the two ends communicated with the upper cavity and the lower cavity respectively is formed in the outer circle of the rotor assembly, the rotating left-handed groove accelerates to drive cold air in the lower cavity into the upper cavity, the cold air accelerates to flow through the gap A, the temperature rise control effect in the gap A is improved, the size of the gap A is guaranteed, and the situation that the stator and the rotor rub each other is further avoided.

Description

Technical Field

[0001] This invention belongs to the field of electric pump technology, and particularly relates to a temperature control system for preventing stator-rotor rubbing in submersible electric pumps. Background Technology

[0002] A submersible electric pump is a pumping device that integrates a motor and a water pump and is completely submerged in water during operation. It is lightweight and portable and is widely used in farmland irrigation, drainage, well water extraction, sewage treatment and other scenarios.

[0003] With the progress of social civilization and the expansion of the economy, various sectors of the national economy are demanding larger submersible pumps in terms of power, inlet and outlet diameter, flow rate, and head. A common technical challenge encountered in this process is the serious failure of stator-rotor rubbing during long-term operation. Specifically, as energy loss from various parts of the motor is converted into heat, the operating temperature of the motor increases, a phenomenon known as temperature rise. Since the rotor's heat dissipation conditions are much worse than the stator's, the rotor temperature becomes higher than the stator temperature. The higher rotor temperature results in a greater thermal expansion of the rotor diameter than the stator's inner bore, causing the gap between the stator and rotor to narrow. When this gap narrows to a certain extent, under the influence of unbalanced centrifugal force and the unilateral magnetic pull between the stator and rotor, stator-rotor rubbing is likely to occur. The frictional work generated by this rubbing is converted into heat, causing the temperature of the friction surfaces to rise, potentially melting the rotor conductors. The high temperature can completely destroy the insulation of the stator windings, rendering the entire submersible pump unusable.

[0004] The failure of stator-rotor rubbing is the most serious problem in the process of submersible pumps becoming larger. Therefore, in order to address the above problem, a temperature control system for preventing stator-rotor rubbing in submersible pumps is designed. Summary of the Invention

[0005] To address the problems in the prior art, the present invention proposes the following technical solution: A temperature control system for preventing stator-rotor rubbing in a submersible pump includes a rotor assembly, a stator assembly, and a pump housing arranged longitudinally from the inside out. There is a gap A between the rotor assembly and the stator assembly, and a gap B between the stator assembly and the pump housing. The stator assembly has an upper cavity above and a lower cavity below, forming a closed cavity with the upper cavity, lower cavity, and stator assembly. The upper cavity and lower cavity are connected by a ventilation pipe. The rotor assembly has a rotating shaft. The iron core of the rotor assembly has an axially penetrating inner hole. The outer circle of the rotor assembly has a left-handed groove. The two ends of the left-handed groove are connected to the upper cavity and the lower cavity, respectively. The upper end of the rotating shaft is located inside the upper cavity and is fitted with a centrifugal fan. The lower end of the rotating shaft extends through the lower cavity into the electric pump housing and is fitted with an impeller. A lower axial flow fan is installed in the section of the rotating shaft located inside the lower cavity. The left-handed groove, the centrifugal fan, the lower axial flow fan, and the impeller rotate synchronously with the rotating shaft. The impeller introduces external cold water from bottom to top and flows through gap B. Under the pressure of the centrifugal fan and the lower axial fan, the cold air in the lower chamber is introduced into the upper chamber through gap A and the inner hole in two ways. The hot air in the upper chamber is introduced into the lower chamber through the ventilation pipe. The hot air flowing from top to bottom through the ventilation pipe and the cold water introduced from bottom to top in gap B complete heat exchange. The synchronously rotating left-hand groove accelerates and drives the cold air from the lower chamber into the upper chamber.

[0006] As a preferred embodiment of the above technical solution, the stator assembly includes a stator base, the upper end of which is connected to an upper cover plate via an upper flange, and the lower end of which is connected to a lower cover plate via a lower flange. The upper cover plate, upper flange, stator base, lower flange, and lower cover plate form a closed cavity, with the portion above the stator base being the upper cavity and the portion below the stator base being the lower cavity.

[0007] As a preferred embodiment of the above technical solution, both the upper cavity and the lower cavity protrude radially from the stator base, and the ventilation pipe connects the lower part of the upper cavity and the upper part of the lower cavity; There is a gap C between the ventilation pipe and the stator base. Cold water flows through the gap C and comes into contact with both the ventilation pipe and the stator base simultaneously.

[0008] As a preferred embodiment of the above technical solution, the ventilation pipe includes a straight pipe and a branch pipe. The straight pipe connects the upper cavity and the lower cavity, and the branch pipe has an A end and a B end. Both the A end and the B end are inserted into the interior of the straight pipe, dividing the interior of the straight pipe into an upper part, a middle part, and a lower part. The hot air in the upper part is split at end A. One part of the hot air enters the branch pipe to exchange heat with the cold water flow, and the other part enters the middle part to exchange heat with the cold water flow. The two parts of hot air that have completed the heat exchange are discharged into the lower cavity through the lower part.

[0009] As a preferred embodiment of the above technical solution, both end A and end B are coaxially arranged with the straight pipe, and end B extends axially through the entire lower part.

[0010] As a preferred embodiment of the above technical solution, an opening is provided at the middle position of the straight pipe, and an arc-shaped cover plate covering the opening is provided on one side of the straight pipe. The arc-shaped cover plate is sealed with the straight pipe. End A is inserted into the interior of the straight pipe through the joint between the arc-shaped cover plate and the straight pipe, and End B is inserted into the interior of the straight pipe through the joint between the arc-shaped cover plate and the straight pipe. The main body section of the branch pipe is provided with pressure plates corresponding to ends A and B. The outer ring thread of the straight pipe is fitted with nuts corresponding to ends A and B. One end of the nut is connected to a pressure cylinder. The end of the pressure plate is inserted into the gap between the pressure cylinder and the straight pipe. The pressure plate seals and covers the connection between the straight pipe, the branch pipe and the arc-shaped cover plate, and keeps ends A and B coaxial with the straight pipe.

[0011] As a preferred embodiment of the above technical solution, the main body of the branch pipe has an upper inclined section and a lower inclined section, with the pressure plate corresponding to end A located on the upper inclined section and the pressure plate corresponding to end B located on the lower inclined section.

[0012] As a preferred embodiment of the above technical solution, a reinforcing rib is provided between the upper inclined section and the pressure plate corresponding to end A, and a reinforcing rib is provided between the lower inclined section and the pressure plate corresponding to end B.

[0013] The beneficial effects of this invention are as follows: In this technical solution, the lower cavity → inner hole → upper cavity → ventilation pipe → lower cavity form a first cooling passage, which passes through the inside of the rotor assembly and limits the internal temperature rise of the rotor assembly; the lower cavity → gap A → upper cavity → ventilation pipe → lower cavity form a second cooling passage, which passes through gap A between the rotor assembly and the stator assembly and limits the temperature rise on the outside of the rotor assembly and the inside of the stator assembly; the cold water flowing from bottom to top through gap B is a third cooling passage, which limits the temperature rise on the outside of the stator assembly.

[0014] The temperature control system for preventing stator-rotor rubbing in this technical solution for submersible pumps is based on the characteristics of the submersible pump being longitudinally distributed and the water flowing from bottom to top during operation. It also leverages the property that hot air is distributed at the top and cold air at the bottom within the same space. Three cooling channels are designed to control the internal temperature rise of the submersible pump, thereby preventing excessive expansion of the rotor and stator assemblies and thus avoiding stator-rotor rubbing. Simultaneously, this technical solution includes a left-handed groove on the outer circumference of the rotor assembly, with its two ends connecting the upper and lower chambers respectively. The rotating left-handed groove accelerates the flow of cold air from the lower chamber to the upper chamber. This accelerated flow of cold air through gap A improves the temperature rise control effect within gap A, ensuring the size of gap A and further preventing stator-rotor rubbing. Attached Figure Description

[0015] Figure 1 The diagram shown is a schematic of the temperature control system for preventing stator-rotor rubbing in a submersible pump according to Embodiment 1. in, Figure 1 The structural diagram of this invention is not a complete structural diagram of the submersible pump, but only shows the core components related to this invention; Figure 2 The diagram shown is a schematic of the temperature control system for preventing stator-rotor rubbing in a submersible pump according to Embodiment 2. in, Figure 2 The structural diagram of this invention is not a complete structural diagram of the submersible pump, but only shows the core components related to this invention; Figure 3 The diagram shown is a structural schematic of the ventilation duct in Embodiment 2; Figure 4 What is shown is Figure 3 Schematic diagram of sectional view AA.

[0016] Reference numerals: Rotor assembly 10; Shaft 11; Inner hole 12; Left-handed groove 13; Stator assembly 20; Stator base 21; Upper flange 31; Lower flange 32; Upper cover plate 33; Lower cover plate 34; Upper cavity 35; Lower cavity 36; Ventilation duct 40; Straight pipe 41; Upper part 411; Middle part 412; Lower part 413; Arc-shaped cover plate 414; Branch pipe 42; End A 421; End B 422; Upper inclined section 423; Lower inclined section 424; Pressure plate 43; Nut 44; Pressure cylinder 45; Reinforcing rib one 46; Reinforcing rib two 47; Centrifugal fan 50; electric pump housing 60; lower axial flow fan 70; impeller 80. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0018] Example 1 To avoid the problem of stator and rotor rubbing due to increased internal temperature after a certain period of operation in existing submersible pumps, which causes the stator and rotor to expand and the gap between them to narrow, a temperature control system for preventing stator-rotor rubbing in submersible pumps is designed, such as... Figure 1 As shown, the device includes a rotor assembly 10, a stator assembly 20, and an electric pump housing 60, which are arranged longitudinally and nested from the inside out. There is a gap A between the rotor assembly 10 and the stator assembly 20, and a gap B between the stator assembly 20 and the electric pump housing 60. The stator assembly 20 has an upper cavity 35 above it and a lower cavity 36 below it. The upper cavity 35, the lower cavity 36, and the stator assembly 20 form a closed cavity. The upper cavity 35 and the lower cavity 36 are connected by a ventilation pipe 40. The rotor assembly 10 has a rotating shaft 11. The iron core of the rotor assembly 10 is provided with an axially penetrating inner hole 12. The outer circle of the rotor assembly 10 is provided with a left-handed groove 13. The two ends of the left-handed groove 13 are respectively connected to the upper cavity 35 and the lower cavity 36. The upper end of the rotating shaft 11 is located inside the upper cavity 35 and is fitted with a centrifugal fan 50. The lower end of the rotating shaft 11 extends through the lower cavity 36 into the electric pump housing 60 and is fitted with an impeller 80. A lower axial flow fan 70 is provided in the section of the rotating shaft 11 located inside the lower cavity 36.

[0019] When the submersible pump is working, the left-hand vortex 13, centrifugal fan 50, lower axial flow fan 70, and impeller 80 rotate synchronously with the shaft 11. The impeller 80 introduces external cold water from bottom to top and flows through gap B. Under the pressure of the centrifugal fan 50 and lower axial flow fan 70, the cold air in the lower chamber 36 is introduced into the upper chamber 35 through gap A and inner hole 12. The hot air in the upper chamber 35 is introduced into the lower chamber 36 through ventilation pipe 40. The hot air flowing from top to bottom in ventilation pipe 40 exchanges heat with the cold water introduced from bottom to top in gap B, ensuring that the air in the lower chamber 36 is at a lower temperature. The synchronously rotating left-hand vortex 13 accelerates and drives the cold air from the lower chamber 36 into the upper chamber 35.

[0020] The lower cavity 36 → inner hole 12 → upper cavity 35 → ventilation pipe 40 → lower cavity 36 form a first cooling passage, which passes through the interior of the rotor assembly 10 and limits the internal temperature rise of the rotor assembly 10; the lower cavity 36 → gap A → upper cavity 35 → ventilation pipe 40 → lower cavity 36 form a second cooling passage, which passes through the gap A between the rotor assembly 10 and the stator assembly 20 and limits the temperature rise on the outside of the rotor assembly 10 and the inside of the stator assembly 20; the cold water flowing from bottom to top through gap B is a third cooling passage, which limits the temperature rise on the outside of the stator assembly 20; The temperature control system for preventing stator-rotor rubbing in this technical solution for submersible pumps is based on the characteristics of the submersible pump being longitudinally distributed and the water flowing from bottom to top during operation. It also leverages the property that hot air is distributed at the top and cold air at the bottom within the same space. Three cooling channels are designed to control the internal temperature rise of the submersible pump, thereby preventing excessive expansion of the rotor assembly 10 and stator assembly 20, which could lead to stator-rotor rubbing. Simultaneously, this technical solution includes a left-handed groove 13 on the outer circumference of the rotor assembly 10, with both ends connecting the upper cavity 35 and the lower cavity 36 respectively. The rotating left-handed groove 13 accelerates the flow of cold air from the lower cavity 36 to the upper cavity 35. This accelerated flow of cold air through gap A improves the temperature rise control effect within gap A, ensuring the size of gap A and further preventing stator-rotor rubbing.

[0021] Regarding the specific components of the internal structure of a submersible pump, such as Figure 1As shown, the stator assembly 20 has a stator base 21. The upper end of the stator base 21 is connected to an upper cover plate 33 via an upper flange 31, and the lower end of the stator base 21 is connected to a lower cover plate 34 via a lower flange 32. The upper cover plate 33, upper flange 31, stator base 21, lower flange 32, and lower cover plate 34 form a closed cavity, that is, an upper cavity 35, a lower cavity 36, and a closed cavity are formed between the stator assembly 20. The closed cavity design allows the cold water to flow through the gap B without entering the interior of the rotor assembly 10 and the stator assembly 20. The part located above the stator base 21 is the upper cavity 35, that is, there is an upper cavity 35 above the stator assembly 20. The part located below the stator base 21 is the lower cavity 36, that is, there is a lower cavity 36 below the stator assembly 20.

[0022] like Figure 1 As shown, the upper cavity 35 and the lower cavity 36 both protrude radially from the stator base 21. The ventilation pipe 40 connects the lower part of the upper cavity 35 and the upper part of the lower cavity 36. While ensuring that the hot air flowing from top to bottom in the ventilation pipe 40 and the cold water flow introduced from bottom to top in the gap B complete the heat exchange, the position of the ventilation pipe 40 is reasonably arranged to reduce the space occupied by the ventilation pipe 40 in the gap B and ensure the water flow of the submersible pump.

[0023] To fully utilize the third cooling path to control temperature rise, a gap C is provided between the ventilation pipe 40 and the stator base 21. This allows the cold water to pass through the gap C and simultaneously contact both the ventilation pipe 40 and the stator base 21. This ensures both the contact area between the cold water and the ventilation pipe 40, guaranteeing the heat exchange between the hot air and the cold water within the ventilation pipe 40, and the contact area between the cold water and the stator assembly 20, ensuring the heat exchange between the outside of the stator assembly 20 and the cold water. This further controls temperature rise and prevents rotor rubbing.

[0024] Example 2 like Figure 1 As shown, a temperature control system for preventing stator-rotor rubbing in a submersible pump includes a rotor assembly 10, a stator assembly 20, and a pump housing 60 arranged longitudinally from the inside out. There is a gap A between the rotor assembly 10 and the stator assembly 20, and a gap B between the stator assembly 20 and the pump housing 60. The stator assembly 20 has an upper cavity 35 above it and a lower cavity 36 below it. The upper cavity 35, the lower cavity 36, and the stator assembly 20 form a closed cavity. The upper cavity 35 and the lower cavity 36 are connected by a ventilation pipe 40. The rotor assembly 10 has a rotating shaft 11. The iron core of the rotor assembly 10 is provided with a longitudinally penetrating inner hole 12. The outer circle of the rotor assembly 10 is provided with a left-handed groove 13. The upper end of the rotating shaft 11 is located inside the upper cavity 35 and is fitted with a centrifugal fan 50. The lower end of the rotating shaft 11 extends through the lower cavity 36 into the electric pump housing 60 and is fitted with an impeller 80. A lower axial flow fan 70 is provided in the section of the rotating shaft 11 located inside the lower cavity 36.

[0025] When the submersible pump is working, the left-hand vortex 13, centrifugal fan 50, lower axial flow fan 70, and impeller 80 rotate synchronously with the shaft 11. The impeller 80 introduces external cold water from bottom to top and flows through gap B. Under the pressure of the centrifugal fan 50 and lower axial flow fan 70, the cold air in the lower chamber 36 is introduced into the upper chamber 35 through gap A and inner hole 12. The hot air in the upper chamber 35 is introduced into the lower chamber 36 through ventilation pipe 40. The hot air flowing from top to bottom in ventilation pipe 40 exchanges heat with the cold water introduced from bottom to top in gap B, ensuring that the air in the lower chamber 36 is at a lower temperature. The synchronously rotating left-hand vortex 13 accelerates and drives the cold air from the lower chamber 36 into the upper chamber 35.

[0026] The lower cavity 36 → inner hole 12 → upper cavity 35 → ventilation pipe 40 → lower cavity 36 form a first cooling passage, which passes through the interior of the rotor assembly 10 and controls the internal temperature rise of the rotor assembly 10; the lower cavity 36 → gap A → upper cavity 35 → ventilation pipe 40 → lower cavity 36 form a second cooling passage, which passes through the gap A between the rotor assembly 10 and the stator assembly 20 and controls the temperature rise on the outside of the rotor assembly 10 and the inside of the stator assembly 20; the cold water flowing from bottom to top through gap B is a third cooling passage, which controls the temperature rise on the outside of the stator assembly 20; The temperature control system for preventing stator-rotor rubbing in this technical solution for submersible pumps is based on the characteristics of the submersible pump being longitudinally distributed and the water flowing from bottom to top during operation. It also leverages the property that hot air is distributed at the top and cold air at the bottom within the same space. Three cooling channels are designed to control the internal temperature rise of the submersible pump, thereby preventing excessive expansion of the rotor assembly 10 and stator assembly 20, which could lead to stator-rotor rubbing. Simultaneously, this technical solution includes a left-handed groove 13 on the outer circumference of the rotor assembly 10, with both ends connecting the upper cavity 35 and the lower cavity 36 respectively. The rotating left-handed groove 13 accelerates the flow of cold air from the lower cavity 36 to the upper cavity 35. This accelerated flow of cold air through gap A improves the temperature rise control effect within gap A, ensuring the size of gap A and further preventing stator-rotor rubbing.

[0027] Because the ventilation duct 40 is designed to allow hot air to circulate inside, and the middle of the ventilation duct 40 is open, the hot air on the outside of the ventilation duct 40 can fully exchange heat. However, the hot air in the middle of the ventilation duct 40 cannot fully exchange heat, resulting in incomplete heat exchange. In order to further improve the heat exchange effect between the hot air flowing from top to bottom and the cold water flow introduced from bottom to top, and to control the temperature rise, the ventilation duct 40 in this technical solution is further optimized as follows.

[0028] like Figure 2 , Figure 3 As shown, a temperature control system for preventing stator-rotor rubbing in a submersible pump includes a ventilation pipe 40 comprising a straight pipe 41 and a branch pipe 42. The straight pipe 41 connects the upper chamber 35 and the lower chamber 36. The branch pipe 42 has an A end 421 and a B end 422, both of which are inserted into the interior of the straight pipe 41, dividing the interior of the straight pipe 41 into an upper part 411, a middle part 412, and a lower part 413. More specifically, the A end 421 and the B end 422 are coaxially arranged with the straight pipe 41, and the B end 422 extends axially through the entire lower part 413. The hot air in the upper part 411 is diverted through the A end 421. One part of the hot air enters the branch pipe 42 to exchange heat with the cold water flow, and the other part enters the middle part 412 to exchange heat with the cold water flow. The two parts of hot air that have completed heat exchange are discharged into the lower chamber 36 through the lower part 413.

[0029] The ventilation duct 40 in this technical solution includes a straight pipe 41 connecting the upper cavity 35 and the lower cavity 36, and a branch pipe 42 with both ends inserted into the straight pipe 41. Hot air first enters the upper part 411 of the straight pipe 41 and undergoes a primary heat exchange with the cold water flow at the upper part 411. The A end 421 splits the hot air after the primary heat exchange, with one part entering the branch pipe 42 and the other part entering the middle part 412 to undergo a secondary heat exchange with the cold water flow. The two parts of hot air that have completed the secondary heat exchange undergo a tertiary heat exchange at the lower part 413. After the first-stage heat exchange between hot air and cold water, end A 421 diverts the poorly heated portion at the center of the upper part 411 and directs it into branch pipe 42 for separate heat exchange with the cold water, improving the cooling effect. End B 422 extends axially through the entire lower part 413, further diverting the air entering the lower part 413 from the middle part 412. Specifically, end B 422 occupies the center position of the lower part 413, forcing the hot air to move outward. At this time, the hot air in the lower part 413 exchanges heat with the cold water on the outside and with the cold air inside end B 422, which has completed the second-stage heat exchange, further improving the heat exchange effect and ensuring sufficient heat exchange between the hot air and cold water in the ventilation pipe 40.

[0030] To solve the assembly problem of ventilation duct 40, such as Figure 2 , Figure 3 , Figure 4 As shown, an opening is provided at the middle position 412 of the straight pipe 41, and an arc-shaped cover plate 414 covering the opening is provided on one side of the straight pipe 41. The arc-shaped cover plate 414 is sealed with the straight pipe 41. End A 421 is inserted into the interior of the straight pipe 41 through the joint between the arc-shaped cover plate 414 and the straight pipe 41, and End B 422 is inserted into the interior of the straight pipe 41 through the joint between the arc-shaped cover plate 414 and the straight pipe 41. The main body section of the branch pipe 42 is provided with pressure plates 43 corresponding to End A 421 and End B 422. The outer ring of the straight pipe 41 is threaded with nuts 44 corresponding to End A 421 and End B 422. One end of the nut 44 is connected to a pressure cylinder 45.

[0031] When assembling the ventilation duct 40, first insert the A end 421 and B end 422 of the branch pipe 42 into the interior of the straight pipe 41 through the opening. Insert the arc-shaped cover plate 414 into the gap between the pressure plate 43 and the straight pipe 41 and cover the opening. Rotate the nut 44 on the straight pipe 41 until the end of the pressure plate 43 is inserted into the gap between the pressure cylinder 45 and the straight pipe 41. At this time, the arc-shaped cover plate 414 and the straight pipe 41 maintain a sealed fit, and the pressure plate 43 seals and covers the straight pipe 41, the branch pipe 42, and the arc-shaped cover plate. At the connection of plate 414, end A 421 and end B 422 are kept coaxial with straight pipe 41. In this technical solution, while solving the assembly problem of ventilation pipe 40, the setting of pressure plate 43 limits the relative position of straight pipe 41 and branch pipe 42, so that end A 421 and end B 422 are kept coaxial with straight pipe 41, improving the ease of assembly, while ensuring the stability of the position of ventilation pipe 40, and ensuring the heat exchange effect between hot air and cold water flow in ventilation pipe 40.

[0032] Because the submersible pump in this technical solution operates with water flowing from bottom to top, to improve heat exchange, the branch pipe 42 extends into the interior of the cold water flow. However, this arrangement affects the water flow and simultaneously impacts the branch pipe 42. Therefore, if... Figure 2 , Figure 3 , Figure 4 As shown, the main body of branch pipe 42 has an upper inclined section 423 and a lower inclined section 424. The pressure plate 43 corresponding to end A 421 is located on the upper inclined section 423, and the pressure plate 43 corresponding to end B 422 is located on the lower inclined section 424. The upper inclined section 423 and the lower inclined section 424 are designed to conform to the direction of water flow, reduce the impact on water flow, and simultaneously reduce the impact on branch pipe 42, ensuring the stability of the ventilation pipe 40 position.

[0033] like Figure 2 , Figure 3 , Figure 4As shown, a reinforcing rib 46 is provided between the upper inclined section 423 and the pressure plate 43 corresponding to end A 421. The reinforcing rib 46 is provided to resist the impact of water flow at the upper inclined section 423 and improve the strength of the branch pipe 42. A reinforcing rib 47 is provided between the lower inclined section 424 and the pressure plate 43 corresponding to end B 422. The reinforcing rib 47 is provided to resist the impact of water flow at the lower inclined section 424 and improve the strength of the branch pipe 42. At the same time, the impact force of the water flow compresses the pressure plate 43 through the reinforcing ribs 46 and 47, and applies a radial force F to the arc-shaped cover plate 414, improving the stability of the assembly of the arc-shaped cover plate 414 and the straight pipe 41.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A temperature control system for preventing stator-rotor rubbing in a submersible pump, comprising a rotor assembly, a stator assembly, and a pump housing arranged longitudinally from the inside out, wherein a gap A exists between the rotor assembly and the stator assembly, and a gap B exists between the stator assembly and the pump housing, characterized in that, The stator assembly has an upper cavity above and a lower cavity below, and the upper cavity, the lower cavity and the stator assembly form a closed cavity, and the upper cavity and the lower cavity are connected by a ventilation pipe; The rotor assembly has a rotating shaft. The iron core of the rotor assembly has an axially penetrating inner hole. The outer circle of the rotor assembly has a left-handed groove. The two ends of the left-handed groove are connected to the upper cavity and the lower cavity, respectively. The upper end of the rotating shaft is located inside the upper cavity and is fitted with a centrifugal fan. The lower end of the rotating shaft extends through the lower cavity into the electric pump housing and is fitted with an impeller. A lower axial flow fan is installed in the section of the rotating shaft located inside the lower cavity. The left-handed groove, the centrifugal fan, the lower axial flow fan, and the impeller rotate synchronously with the rotating shaft. The impeller introduces external cold water from bottom to top and flows through gap B. Under the pressure of the centrifugal fan and the lower axial fan, the cold air in the lower chamber is introduced into the upper chamber through gap A and the inner hole in two ways. The hot air in the upper chamber is introduced into the lower chamber through the ventilation pipe. The hot air flowing from top to bottom in the ventilation pipe and the cold water introduced from bottom to top in gap B complete heat exchange. The synchronously rotating left-hand groove accelerates and drives the cold air from the lower chamber into the upper chamber.

2. The temperature control system for preventing stator-rotor rubbing in a submersible pump according to claim 1, characterized in that, The stator assembly includes a stator base. The upper end of the stator base is connected to an upper cover plate via an upper flange, and the lower end of the stator base is connected to a lower cover plate via a lower flange. The upper cover plate, upper flange, stator base, lower flange, and lower cover plate form a closed cavity. The portion above the stator base is the upper cavity, and the portion below the stator base is the lower cavity.

3. The temperature control system for preventing stator-rotor rubbing in a submersible pump according to claim 2, characterized in that, The upper cavity and the lower cavity both protrude radially from the stator base, and the ventilation pipe connects the lower part of the upper cavity and the upper part of the lower cavity; There is a gap C between the ventilation pipe and the stator base. Cold water flows through the gap C and comes into contact with both the ventilation pipe and the stator base simultaneously.

4. The temperature control system for preventing stator-rotor rubbing in a submersible pump according to claim 1, characterized in that, The ventilation duct includes a straight pipe and a branch pipe. The straight pipe connects the upper cavity and the lower cavity. The branch pipe has an A end and a B end. Both the A end and the B end are inserted into the interior of the straight pipe, dividing the interior of the straight pipe into an upper part, a middle part, and a lower part. The hot air in the upper part is split at end A. One part of the hot air enters the branch pipe to exchange heat with the cold water flow, and the other part enters the middle part to exchange heat with the cold water flow. The two parts of hot air that have completed the heat exchange are discharged into the lower cavity through the lower part.

5. The temperature control system for preventing stator-rotor rubbing in a submersible pump according to claim 4, characterized in that, Both end A and end B are coaxially arranged with the straight pipe, and end B extends axially through the entire lower part.

6. The temperature control system for preventing stator-rotor rubbing in a submersible pump according to claim 4, characterized in that, An opening is provided at the middle of the straight pipe, and an arc-shaped cover plate is provided on one side of the straight pipe to cover the opening. The arc-shaped cover plate is sealed to the straight pipe. End A is inserted into the interior of the straight pipe through the joint between the arc-shaped cover plate and the straight pipe, and End B is inserted into the interior of the straight pipe through the joint between the arc-shaped cover plate and the straight pipe. The main body section of the branch pipe is provided with pressure plates corresponding to ends A and B. The outer ring thread of the straight pipe is fitted with nuts corresponding to ends A and B. One end of the nut is connected to a pressure cylinder. The end of the pressure plate is inserted into the gap between the pressure cylinder and the straight pipe. The pressure plate seals and covers the connection between the straight pipe, the branch pipe and the arc-shaped cover plate, and keeps ends A and B coaxial with the straight pipe.

7. The temperature control system for preventing stator-rotor rubbing in a submersible pump according to claim 6, characterized in that, The main body of the branch pipe has an upper inclined section and a lower inclined section. The pressure plate corresponding to end A is located on the upper inclined section, and the pressure plate corresponding to end B is located on the lower inclined section.

8. The temperature control system for preventing stator-rotor rubbing in a submersible pump according to claim 7, characterized in that, A reinforcing rib is provided between the upper inclined section and the pressure plate at the corresponding end A, and a reinforcing rib is provided between the lower inclined section and the pressure plate at the corresponding end B.

Images