A vacuum pressure impregnation system and method for submersible permanent magnet motors

Abstract

This invention relates to a vacuum pressure impregnation system and method for a submersible permanent magnet motor, belonging to the field of submersible pump technology. The technical solution is as follows: a vacuum pump (7) is connected to a vacuum tank (4) through a vacuum pump outlet pipe (8.6), and the vacuum tank (4) is connected to an insulating varnish tank (5) and both are connected to an air filter (2); the top of the vacuum tank (4) is connected to the high side of the stator (13.2) through an impregnation pipe one (8.4), and the insulating varnish tank (5) is connected to the low side of the stator (13.1) through an impregnation pipe two (8.5). By drawing a vacuum to form a negative pressure, the insulating varnish is impregnated into the stator windings of the stator (10). The beneficial effects of this invention are: by using vacuum pressure impregnation, the insulating varnish moves from the low side of the motor to the high side under pressure, and the internal air reservoir can be squeezed out during the impregnation process to ensure thorough filling; since an expanding tire is used, the insulating varnish will not be leaked, and there is no need for scraping, reducing operation steps and potential hazards.

Description

Technical Field

[0001] This invention relates to a vacuum pressure impregnation system and method for a submersible permanent magnet motor, and more particularly to a device for impregnating the stator of a submersible permanent magnet motor during the production process of the submersible permanent magnet motor, belonging to the field of submersible pump technology. Background Technology

[0002] As an emerging lifting method in the petroleum industry, submersible direct-drive screw pump units are rapidly developing towards intelligence, high efficiency, adaptability to complex working conditions, and green low-carbon practices. The service life and maintenance cycle of the unit are crucial factors affecting the development of submersible pumps, thus requiring strict control over every stage of production. Motor insulation is a key factor in determining the quality of a motor. Motor impregnation improves insulation performance, enhances mechanical strength, provides moisture and corrosion protection, improves heat dissipation, and resists chemical and dust pollution, making it a vital step in the production process.

[0003] The existing conventional varnishing method involves completely immersing the stator winding in varnish. However, this method has several problems: air bubbles may be generated during the process, resulting in incomplete filling of the interior. Furthermore, after varnishing, the inner cavity of the stator winding needs to be scraped to ensure the inner diameter of the stator winding. However, the scraping process can easily damage the winding wires, leading to motor damage and posing a safety hazard. Summary of the Invention

[0004] The purpose of this invention is to provide a vacuum pressure impregnation system and method for submersible permanent magnet motors. The system employs vacuum pressure impregnation, where the insulating varnish is applied under pressure from the low side to the high side of the motor. During the impregnation process, the internal air reservoir can be squeezed out, ensuring thorough filling. Because an expanding tire is used, the insulating varnish will not be missed, eliminating the need for scraping, reducing operational steps and potential hazards, and solving the problems existing in the background technology.

[0005] The technical solution of this invention is: A vacuum pressure impregnation system for a submersible permanent magnet motor includes an impregnation bracket, an air filter, a vacuum tank, an insulating varnish tank, and a vacuum pump. The air filter, vacuum tank, insulating varnish tank, and vacuum pump are mounted on the impregnation bracket. The vacuum pump is connected to the vacuum tank via a vacuum pump outlet pipe. The vacuum tank is connected to the insulating varnish tank and both are connected to the air filter. The top of the vacuum tank is connected to the high side of the stator via an impregnation pipe one, and the insulating varnish tank is connected to the low side of the stator via an impregnation pipe two. The insulating varnish is impregnated into the stator windings by creating a negative pressure through vacuuming.

[0006] The stator is equipped with an expansion tire, the length of which is the same as the length of the stator winding, and both ends of the expansion tire are flush with the stator winding. The expansion tire, made of rubber and cylindrical in shape (similar to a bicycle inner tube), must be installed before stator impregnation. The expansion tire is completely inserted into the stator winding, with both ends flush with the winding. One end of the expansion tire has an air inlet; air is supplied through this inlet, causing the tire to expand under pressure until it completely adheres to the inner surface of the stator winding. The purpose of the expansion tire is to ensure that the insulating varnish remains within the stator winding during impregnation, preventing leakage to other areas.

[0007] The top of the vacuum tank is connected to the high side of the stator in sequence via the vacuum tank inlet pipe, pipe one, and varnish impregnation pipe one. The vacuum tank inlet pipe and pipe one are connected to one end of pipe two via tee one. The other end of pipe two is connected to one end of the insulating varnish tank inlet pipe and the inlet pipe via tee two. The other ends of the insulating varnish tank inlet pipe and the inlet pipe are connected to the top of the insulating varnish tank and the air outlet of the air filter, respectively. The air inlet of the air filter is connected to the air pipe. When the air source switch is turned on, compressed air enters the air filter from the air inlet. The air filter absorbs moisture and impurities in the compressed air, preventing moisture from entering the stator windings with the insulating varnish and causing a reduction in insulation.

[0008] Valves 3 and 1 are respectively installed on the vacuum tank inlet pipe and the varnish impregnation pipe 1; both pipe 2 and the inlet pipe are L-shaped pipes, and valves 4 and 5 are respectively installed on pipe 2 and the inlet pipe; valves 6 and 7 are respectively installed on the insulating varnish tank inlet pipe and the varnish impregnation pipe 2; valve 2 is installed on the vacuum pump outlet pipe.

[0009] The impregnation pipe is equipped with a glass sight glass, which has a detection device. When the insulating varnish enters the glass sight glass, valves one and seven will be automatically closed.

[0010] The vacuum tank is equipped with a vacuum tank pressure transmitter and a vacuum tank pressure gauge, which can be used to observe specific values.

[0011] The insulating varnish tank is equipped with an insulating varnish tank pressure transmitter, an insulating varnish tank pressure gauge, and a magnetic float-type level gauge. The specific values ​​can be observed through the insulating varnish tank pressure transmitter and the insulating varnish tank pressure gauge; the remaining amount of insulating varnish can be monitored in real time through the magnetic float-type level gauge, and when the amount of varnish is found to be too low, it needs to be replenished.

[0012] The vacuum pump is installed inside the control box, and a control panel is provided on the outer surface of the control box. The control panel is connected to the vacuum tank pressure transmitter and the insulating varnish tank pressure transmitter.

[0013] The insulating varnish can is wrapped with a ceramic heating ring. Before the impregnation process, the insulating varnish needs to be preheated. This temperature is set through the control panel, and impregnation can only begin after the temperature is reached.

[0014] The vacuum tank and the insulating varnish tank are respectively equipped with a vacuum tank drain valve and an insulating varnish tank drain valve at the bottom. When the vacuum tank and the insulating varnish tank need to be cleaned, connect and open the vacuum tank drain valve and the insulating varnish tank drain valve to allow the liquid in the vacuum tank and the insulating varnish tank to flow out through the vacuum tank drain valve and the insulating varnish tank drain valve, respectively.

[0015] There are two of each of the varnish impregnation pipes 1 and 2. Each varnish impregnation pipe 1 is equipped with a valve 1 and a glass sight glass. The two varnish impregnation pipes 1 are connected to pipe 1 via a tee 3. Each varnish impregnation pipe 2 is equipped with a valve 7. The two varnish impregnation pipes 2 are connected to the insulating varnish tank via a tee 4. The number of varnish impregnation pipes 1 and 2 matches the number of stators.

[0016] The stator is mounted on a stator support, which is equipped with a cylinder and a rotating shaft. The stator support can hold three stators and can accommodate two stators simultaneously for varnishing. When varnishing is required, the cylinder valve is opened, the cylinder rod extends, and the stator support rotates around the rotating shaft, causing the left side to rise and the right side to fall.

[0017] The vacuum pump is a rotary vane vacuum pump, which is a well-known and commonly used device in the field.

[0018] The air filter, glass sight glass, vacuum tank, insulating varnish tank, control box, vacuum tank pressure transmitter, vacuum tank pressure gauge, vacuum tank drain valve, insulating varnish tank pressure transmitter, insulating varnish tank pressure gauge, magnetic float level gauge, insulating varnish tank drain valve, and control panel are all commonly known and used equipment in the field.

[0019] A method for vacuum pressure impregnation of a submersible permanent magnet motor, employing the aforementioned vacuum pressure impregnation system for a submersible permanent magnet motor, includes the following steps: Place the stator to be impregnated on the stator support. Connect impregnation pipe one and impregnation pipe two to the high side and low side of the stator, respectively. Close valve three and turn on the vacuum pump. The vacuum pump is connected to the vacuum tank through the vacuum pump outlet pipe. The vacuum pump draws out and removes air from the vacuum tank, creating a negative pressure inside. The pressure can be observed using the vacuum tank pressure transmitter and vacuum tank pressure gauge. Set the vacuum value to -0.1 MPa on the control panel. When the vacuum tank pressure transmitter detects a value lower than this value, it will stop the vacuum pump. When the vacuum tank pressure transmitter detects a value higher than this value, the vacuum pump will restart to maintain stable pressure inside the pipe. Connect the air pipe to the air inlet and close valves four and seven. Turn on the air supply switch. Compressed air enters the air filter through the inlet. The air filter absorbs moisture and impurities from the compressed air, preventing moisture from entering the stator windings with the insulating varnish and causing insulation degradation. The purified compressed air enters the insulating varnish tank through the inlet pipe. Because valve seven at the outlet is closed, positive pressure is formed inside the insulating varnish tank, which is displayed by the insulating varnish tank pressure transmitter and pressure gauge. The pressure value is set to 0.5 MPa on the control panel. When the insulating varnish tank pressure transmitter detects that the air pressure is greater than this value, valves one, three, and seven open. At this time, the entire impregnation system is connected, forming positive pressure on the low side of the stator and positive pressure on the high side of the stator. Negative pressure; because the insulating varnish tank contains insulating varnish, under pressure, the insulating varnish enters the stator from the lower side of the stator along the second impregnation pipe and flows out from the higher side of the stator, ensuring that the insulating varnish can fill the entire stator; when insulating varnish is detected flowing out from the first impregnation pipe, valves one and seven are closed to prevent the insulating varnish from entering the vacuum tank under pressure; if the valves are not closed in time, the glass sight glass has a detection device, which will automatically close valves one and seven when the insulating varnish enters the glass sight glass; valve five is closed, and valves four and six are opened. At this time, the vacuum tank is connected to the insulating varnish tank, and the insulating varnish tank is evacuated; the pressure value is set to -0.1MPa on the control panel, and the insulating varnish tank pressure transmitter... When the detected value is less than this, the vacuum pump stops running, valve six closes, and valves four and five open. At this time, compressed air enters the vacuum tank along the pipeline, creating a positive pressure inside the vacuum tank and a negative pressure inside the insulating varnish tank. The pressure value is set to 0.5 MPa on the control panel. When the vacuum tank pressure transmitter detects a value greater than this, valves one and seven are opened, reconnecting the impregnation system. The high side of the stator is under positive pressure, and the low side is under negative pressure. Excess insulating varnish in the pipeline and stator flows back into the insulating varnish tank under pressure. After the insulating varnish has flowed back, valve six is ​​opened and the air source switch is closed. At this time, the pressure in both the vacuum tank and the insulating varnish tank is balanced with the external pressure, and the impregnation process is complete.

[0020] The insulating varnish tank is equipped with a magnetic float level gauge, which can monitor the remaining amount of insulating varnish in real time. When the varnish level is found to be too low, it needs to be replenished. When replenishing the varnish, the varnish impregnation pipe 2 is placed into the insulating varnish tank, valves 1, 5 and 7 are closed, and the vacuum pump is turned on. At this time, the vacuum pump is connected to the insulating varnish tank through the vacuum tank, and a negative pressure is formed in the insulating varnish tank. When the pressure is set to -0.1MPa on the control panel, valve 7 is opened. Due to the negative pressure in the pipe, the insulating varnish will be sucked into the insulating varnish tank along the varnish impregnation pipe 2. When the varnish level reaches the upper limit, valve 7 is closed, and the vacuum pump stops running. The closed valve is then opened. At this time, the insulating varnish tank is in equilibrium with the outside environment, and the replenishment of insulating varnish is completed.

[0021] The beneficial effects of this invention are: by using vacuum pressure impregnation, the insulating varnish is applied from the low side of the motor to the high side under pressure, and the internal air reservoir can be squeezed out during the impregnation process to ensure thorough filling; since an expanding tire is used, the insulating varnish will not be missed, and there is no need for scraping, reducing operation steps and potential hazards. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a perspective view of the present invention; Figure 3 This is the front view of the present invention; Figure 4 This is a top view of the present invention; Figure 5 This is a schematic diagram showing the flow direction of gas and insulating varnish during the impregnation process of this invention; Figure 6 This is a schematic diagram of the stator and stator support structure of the present invention; Figure 7 This is a top view of the stator and stator support of the present invention; In the diagram: 1. Impregnation bracket; 2. Air filter; 3. Glass sight glass; 4. Vacuum tank; 5. Insulating varnish tank; 6. Control box; 7. Vacuum pump; 8.1 Vacuum tank pressure transmitter; 9. Vacuum tank pressure gauge; 10. Vacuum tank drain valve; 11. Insulating varnish tank pressure transmitter; 12. Insulating varnish tank pressure gauge; 13. Ceramic heating coil; 14. Magnetic level gauge; 15. Insulating varnish tank drain valve; 16. Control panel; 17. Air inlet; 18.1 Insulating varnish tank air inlet pipe; 19. Vacuum tank air inlet pipe; 10. Impregnation pipe; 11. Impregnation tube. Pipeline 2 (8.5), Vacuum pump outlet pipe (8.6), Pipeline 1 (8.7), Pipeline 2 (8.8), Inlet pipe (8.9), T-junction 1 (8.10), T-junction 2 (8.11), T-junction 3 (8.12), T-junction 4 (8.13), Valve 1 (9.1), Valve 2 (9.2), Valve 3 (9.3), Valve 4 (9.4), Valve 5 (9.5), Valve 6 (9.6), Valve 7 (9.7), Stator (10), Expansion tire (11), Expansion tire inlet (11.1), Stator bracket (12), Cylinder (12.1), Rotating shaft (12.2), Stator low side (13.1), Stator high side (13.2). Detailed Implementation

[0023] The invention will be further illustrated below with reference to the accompanying drawings and examples.

[0024] In this embodiment, refer to the appendix. Figure 1-7 A vacuum pressure impregnation system for a submersible permanent magnet motor includes an impregnation bracket 1, an air filter 2, a vacuum tank 4, an insulating varnish tank 5, and a vacuum pump 7. The air filter 2, vacuum tank 4, insulating varnish tank 5, and vacuum pump 7 are mounted on the impregnation bracket 1. The vacuum pump 7 is connected to the vacuum tank 4 via a vacuum pump outlet pipe 8.6. The vacuum tank 4 is connected to the insulating varnish tank 5 and both are connected to the air filter 2. The top of the vacuum tank 4 is connected to the high side 13.2 of the stator via an impregnation pipe 8.4. The insulating varnish tank 5 is connected to the low side 13.1 of the stator via an impregnation pipe 8.5. By creating a negative pressure through vacuuming, the insulating varnish is impregnated into the stator windings of the stator 10.

[0025] The stator 10 is equipped with an expansion tire 11. Before impregnation, the stator 10 needs to be fitted with the expansion tire 11, which is made of rubber and cylindrical in shape (similar to a bicycle inner tube). The length of the expansion tire 11 is the same as the length of the stator winding. The expansion tire 11 is completely inserted into the stator winding, with both ends flush with the winding. One end of the expansion tire 11 has an air inlet 11.1. Air is supplied through this inlet, causing the tire to expand under pressure until it completely adheres to the inner surface of the stator winding. The purpose of the expansion tire is to ensure that the insulating varnish remains within the stator winding during impregnation, preventing leakage to other areas.

[0026] The top of the vacuum tank 4 is connected to the stator high side 13.2 via a vacuum tank inlet pipe 8.3, pipe 8.7, and varnish impregnation pipe 8.4 connected in sequence. The vacuum tank inlet pipe 8.3 and pipe 8.7 are connected to one end of pipe 8.8 via tee 8.10. The other end of pipe 8.8 is connected to one end of the insulating varnish tank inlet pipe 8.2 and inlet pipe 8.9 via tee 8.11. The other ends of the insulating varnish tank inlet pipe 8.2 and inlet pipe 8.9 are connected to the top of the insulating varnish tank 5 and the air outlet of the air filter 2, respectively. The air inlet 8.1 of the air filter 2 is connected to an air pipe. When the air source switch is turned on, compressed air enters the air filter 2 from the air inlet 8.1. The air filter 2 absorbs moisture and impurities in the compressed air, preventing moisture from entering the stator windings with the insulating varnish and causing a reduction in insulation.

[0027] Valves 3 (9.3) and 1 (9.1) are respectively installed on the vacuum tank inlet pipe 8.3 and the varnish impregnation pipe 1 (8.4); both pipe 2 (8.8) and inlet pipe 8.9 are L-shaped pipes, and valves 4 (9.4) and 5 (9.5) are respectively installed on pipe 2 (8.8) and inlet pipe 8.9; valves 6 (9.6) and 7 (9.7) are respectively installed on the insulating varnish tank inlet pipe 8.2 and the varnish impregnation pipe 2 (8.5); valve 2 (9.2) is installed on the vacuum pump outlet pipe 8.6.

[0028] The impregnation pipe 8.4 is equipped with a glass sight glass 3, which has a detection device. When the insulating varnish enters the glass sight glass, valves 1 and 7 will be automatically closed.

[0029] The number of impregnation pipe 1 8.4, impregnation pipe 2 8.5, valve 1 9.1, valve 7 9.7 and glass sight glass 3 are all two, which can impregnate the stator windings of two stators at the same time; the two impregnation pipes 1 8.4 are connected to pipe 1 8.7 through tee 3 8.12, and the two impregnation pipes 2 8.5 are connected to insulating varnish tank 5 through tee 4 8.13.

[0030] The vacuum tank 4 is equipped with a vacuum tank pressure transmitter 4.1 and a vacuum tank pressure gauge 4.2, which can be used to observe specific values.

[0031] The insulating varnish tank 5 is equipped with an insulating varnish tank pressure transmitter 5.1, an insulating varnish tank pressure gauge 5.2, and a magnetic float-type level gauge 5.4. The specific values ​​can be observed through the insulating varnish tank pressure transmitter 5.1 and the insulating varnish tank pressure gauge 5.2; the remaining amount of insulating varnish can be monitored in real time through the magnetic float-type level gauge 5.4. When the amount of varnish is found to be too low, it needs to be replenished.

[0032] The vacuum pump 7 is installed inside the control box 6. The outer surface of the control box 6 is equipped with a control panel 6.1, which is connected to the vacuum tank pressure transmitter 4.1 and the insulating varnish tank pressure transmitter 5.1.

[0033] The insulating varnish can 5 is wrapped with a ceramic heating ring 5.3. Before the impregnation process, the insulating varnish needs to be heated in advance. This temperature is set through the control panel 6.1. Impregnation can only be carried out after the temperature is reached.

[0034] The vacuum tank 4 and the insulating varnish tank 5 are respectively equipped with a vacuum tank drain valve 4.3 and an insulating varnish tank drain valve 5.5 at their bottoms. When the vacuum tank 4 and the insulating varnish tank 5 need to be cleaned, the vacuum tank drain valve 4.3 and the insulating varnish tank drain valve 5.5 are connected and opened, allowing the liquid in the vacuum tank 4 and the insulating varnish tank 5 to flow out along the vacuum tank drain valve 4.3 and the insulating varnish tank drain valve 5.5 respectively.

[0035] The stator 10 is mounted on a stator support 12, which is equipped with a cylinder 12.1 and a rotating shaft 12.2. The stator support can hold three stators and allows two stators to be impregnated simultaneously. When impregnation is required, the cylinder valve is opened, the cylinder rod extends, and the stator support rotates around the rotating shaft, raising the left side and lowering the right side. The impregnation process is divided into two stages. After the first impregnation, the high side 13.2 and the low side 13.1 of the stator are interchanged, and the stator is impregnated again to ensure that every part of the stator winding is filled with insulating varnish.

[0036] A method for vacuum pressure impregnation of a submersible permanent magnet motor, employing the aforementioned vacuum pressure impregnation system for a submersible permanent magnet motor, includes the following steps: Place the stator 10 to be impregnated on a stator support 11 with an incline. Connect impregnation pipe 1 8.4 and impregnation pipe 2 8.5 to the high side 13.2 and low side 13.1 of the stator, respectively. Close valve 3 9.3 and turn on the rotary vane vacuum pump (located in the control box 6). The vacuum pump 7 is connected to the vacuum tank 4 through the vacuum pump outlet pipe 8.6. The vacuum pump 7 sucks away and removes the air in the vacuum tank 4, creating a negative pressure inside the vacuum tank 4. The specific values ​​can be observed through the vacuum tank pressure transmitter 4.1 and the vacuum tank pressure gauge 4.2. Set the vacuum value to -0.1MPa on the control panel 6.1. When the vacuum tank pressure transmitter detects a value less than this value, it will stop the vacuum pump. When the vacuum tank pressure transmitter detects a value greater than this value, the vacuum pump will restart to maintain stable pressure inside the pipe.

[0037] Connect the air pipe to the air inlet 8.1, close valve 4 9.4 and both valves 7 9.7, and turn on the air source switch. At this time, compressed air enters the air filter 2 from the air inlet 8.1. The air filter 2 absorbs moisture and impurities in the compressed air, preventing moisture from entering the stator windings with the insulating varnish and causing insulation degradation. The purified compressed air enters the insulating varnish tank 5 through the insulating varnish tank inlet pipe 8.2. Since the two valves 7 at the outlet are closed, a positive pressure is formed in the insulating varnish tank 5, and this positive pressure is transmitted through the insulating varnish tank pressure transmitter 5. The pressure gauge 5.2 of the insulating varnish tank displays the pressure. On the control panel 6.1, the pressure value is set to 0.5 MPa. When the pressure transmitter 5.1 of the insulating varnish tank detects that the air pressure is greater than this value, valves 1, 3 and two valves 7 open. At this time, the entire impregnation system is connected, forming a positive pressure on the low side of the stator and a negative pressure on the high side of the stator. Since there is insulating varnish in the insulating varnish tank 5, under the action of pressure, the insulating varnish enters the stator from the low side of the stator along the impregnation pipe 2 8.5 and flows out from the high side of the stator to ensure that the insulating varnish can fill the entire stator.

[0038] When insulating varnish is detected flowing out of the impregnation pipe, close valves 1 and 7 to prevent the insulating varnish from entering the vacuum tank under pressure. If the valves are not closed in time, the glass sight glass 3 has a detection device that will automatically close valves 1 and 7 when the insulating varnish enters the glass sight glass.

[0039] Close valve 5 (9.5), open valves 4 and 6 (9.6). At this point, vacuum tank 4 is connected to insulating varnish tank 5, and a vacuum is evacuated from insulating varnish tank 5. On control panel 6.1, set the pressure value to -0.1 MPa. When the insulating varnish tank pressure transmitter 5.1 detects a pressure below this value, vacuum pump 7 stops running, valve 6 (9.6) closes, and valves 4 and 5 open. Compressed air then enters vacuum tank 4 through the pipeline, creating a positive pressure inside vacuum tank 4 and a negative pressure inside insulating varnish tank 5. On control panel... 6.1 Set the pressure value to 0.5MPa. When the vacuum tank pressure transmitter 4.1 detects a value greater than this, open two valves one and two valves seven. At this time, the impregnation system is connected again. The high side of the stator is under positive pressure and the low side of the stator is under negative pressure. Excess insulating varnish in the pipeline and stator flows back into the insulating varnish tank 5 under pressure. After the insulating varnish has flowed back, open valve six 9.6 and close the air source switch. At this time, the pressure in the vacuum tank 4 and the insulating varnish tank 5 is balanced with the outside pressure, and the impregnation process is completed.

[0040] The insulating varnish tank 5 is also equipped with a magnetic float level gauge 5.4, which can monitor the remaining amount of insulating varnish in real time. When the varnish level is found to be too low, it needs to be replenished. To replenish the varnish, place the impregnation pipe 2 8.5 into the insulating varnish tank, close valves 1 and 5, and valves 7, and turn on the vacuum pump. At this time, the vacuum pump 7 is connected to the insulating varnish tank 5 through the vacuum tank 4, creating a negative pressure in the insulating varnish tank 5. When the pressure is set to -0.1MPa on the control panel 6.1, open the two valves 7. Due to the negative pressure inside the pipe, the insulating varnish will be drawn into the insulating varnish tank 5 along the impregnation pipe 2. When the varnish level reaches the upper limit, close the two valves 7, and the vacuum pump stops running. Open the closed valves; at this point, the insulating varnish tank 5 is balanced with the external environment, and the replenishment of the insulating varnish is complete.

[0041] This invention uses a vacuum to create negative pressure, impregnating the insulating varnish into the stator windings of a motor, thus improving insulation performance and enhancing mechanical strength. Before impregnation, an expansion liner is installed, completely inserted into the stator windings with both ends flush with the windings. The expansion liner is then inflated, continuously expanding under air pressure until it completely adheres to the inner surface of the stator windings. The purpose of the expansion liner is to ensure that the insulating varnish remains within the stator windings during the impregnation process, preventing leakage to other areas.

[0042] During impregnation, impregnation pipe one is connected to the high side of the stator, and impregnation pipe two is connected to the low side of the stator. The impregnation process is divided into two parts. After the first impregnation, the high side 13.2 and the low side 13.1 of the stator are interchanged, and impregnation is carried out again to ensure that every part of the stator winding is filled with insulating varnish.

[0043] This invention employs vacuum pressure impregnation. Under pressure, the insulating varnish is applied from the lower side of the motor to the higher side. During the impregnation process, the internal air reservoir is squeezed out, ensuring thorough filling. Because an expanding tire is used, no insulating varnish is missed, eliminating the need for scraping and reducing operational steps and potential hazards.

Claims

1. A vacuum pressure impregnation system for a submersible permanent magnet motor, characterized in that: The device includes an impregnation bracket (1), an air filter (2), a vacuum tank (4), an insulating varnish tank (5), and a vacuum pump (7). The air filter (2), vacuum tank (4), insulating varnish tank (5), and vacuum pump (7) are installed on the impregnation bracket (1). The vacuum pump (7) is connected to the vacuum tank (4) through a vacuum pump outlet pipe (8.6). The vacuum tank (4) is connected to the insulating varnish tank (5) and both are connected to the air filter (2). The top of the vacuum tank (4) is connected to the high side of the stator (13.2) through an impregnation pipe (8.4). The insulating varnish tank (5) is connected to the low side of the stator (13.1) through an impregnation pipe (8.5). The insulating varnish is impregnated into the stator windings of the stator (10) by creating a negative pressure through vacuuming.

2. The vacuum pressure impregnation system for a submersible permanent magnet motor according to claim 1, characterized in that: The stator (10) is provided with an expansion tire (11), the length of which is the same as the length of the stator winding, and both ends of the expansion tire (11) are flush with the stator winding; one end of the expansion tire (11) is provided with an expansion tire air inlet (11.1).

3. A vacuum pressure impregnation system for a submersible permanent magnet motor according to claim 1 or 2, characterized in that: The top of the vacuum tank (4) is connected to the stator high side (13.2) in sequence through the vacuum tank inlet pipe (8.3), pipe one (8.7), and varnish impregnation pipe one (8.4). The vacuum tank inlet pipe (8.3) and pipe one (8.7) are connected to one end of pipe two (8.8) through tee one (8.10). The other end of pipe two (8.8) is connected to one end of the insulating varnish tank inlet pipe (8.2) and inlet pipe (8.9) through tee two (8.11). The other ends of the air inlet pipe (8.2) and air inlet pipe (8.9) of the insulating varnish can are connected to the top of the insulating varnish can (5) and the air outlet of the air filter (2), respectively. The air inlet (8.1) of the air filter (2) is connected to the air pipe. When the air source switch is turned on, compressed air enters the air filter (2) from the air inlet (8.1). The air filter (2) absorbs the moisture and impurities in the compressed air, preventing moisture from entering the stator winding with the insulating varnish and causing a reduction in insulation.

4. The vacuum pressure impregnation system for a submersible permanent magnet motor according to claim 3, characterized in that: Valves 3 (9.3) and 1 (9.1) are respectively installed on the vacuum tank inlet pipe (8.3) and the varnish impregnation pipe 1 (8.4); both pipe 2 (8.8) and inlet pipe (8.9) are L-shaped pipes, and valves 4 (9.4) and 5 (9.5) are respectively installed on pipe 2 (8.8) and inlet pipe (8.9); valves 6 (9.6) and 7 (9.7) are respectively installed on the insulating varnish tank inlet pipe (8.2) and varnish impregnation pipe 2 (8.5); valve 2 (9.2) is installed on the vacuum pump outlet pipe (8.6).

5. The vacuum pressure impregnation system for a submersible permanent magnet motor according to claim 4, characterized in that: The varnish-impregnating pipe 1 (8.4) is equipped with a glass sight glass (3), which is equipped with a detection device. When the insulating varnish enters the glass sight glass, valve 1 and valve 7 will be automatically closed.

6. A vacuum pressure impregnation system for a submersible permanent magnet motor according to claim 1 or 2, characterized in that: The vacuum tank (4) is equipped with a vacuum tank pressure transmitter (4.1) and a vacuum tank pressure gauge (4.2); the insulating varnish tank (5) is equipped with an insulating varnish tank pressure transmitter (5.1), an insulating varnish tank pressure gauge (5.2), and a magnetic float level gauge (5.4); the vacuum pump (7) is installed inside the control box (6), and the outer surface of the control box (6) is equipped with a control panel (6.1), which is connected to the vacuum tank pressure transmitter (4.1) and the insulating varnish tank pressure transmitter (5.1); a ceramic heating ring (5.3) is wrapped around the insulating varnish tank (5). Before the impregnation process, the insulating varnish needs to be heated in advance. This temperature is set through the control panel (6.1), and impregnation can only be carried out after the temperature is reached.

7. The vacuum pressure impregnation system for a submersible permanent magnet motor according to claim 6, characterized in that: The vacuum tank (4) and the insulating varnish tank (5) are respectively equipped with a vacuum tank drain valve (4.3) and an insulating varnish tank drain valve (5.5) at the bottom. When the vacuum tank (4) and the insulating varnish tank (5) need to be cleaned, the vacuum tank drain valve (4.3) and the insulating varnish tank drain valve (5.5) are connected and opened, so that the liquid in the vacuum tank (4) and the insulating varnish tank (5) flows out along the vacuum tank drain valve (4.3) and the insulating varnish tank drain valve (5.5) respectively.

8. A vacuum pressure impregnation system for a submersible permanent magnet motor according to claim 1 or 2, characterized in that: The stator (10) is mounted on the stator support (12), which is equipped with a cylinder (12.1) and a rotating shaft (12.2). When it is necessary to impregnate the stator with paint, the cylinder valve is opened, the cylinder rod extends, and the stator support moves around the rotating shaft, causing the left side to rise and the right side to fall.

9. A method for vacuum pressure impregnation of a submersible permanent magnet motor, employing the vacuum pressure impregnation system for a submersible permanent magnet motor as described in any one of claims 1-8, characterized in that... It includes the following steps: Place the stator (10) to be impregnated on the stator support (11), and connect impregnation pipe one (8.4) and impregnation pipe two (8.5) to the high side (13.2) and low side (13.1) of the stator respectively; close valve three (9.3), turn on the vacuum pump (7), and connect the vacuum pump (7) to the vacuum tank (4) through the vacuum pump outlet pipe (8.6). The vacuum pump (7) sucks away and removes the air in the vacuum tank (4), forming a negative pressure in the vacuum tank (4). The pressure values ​​can be observed on the transmitter (4.1) and the vacuum tank pressure gauge (4.2); the vacuum value is set to -0.1MPa on the control panel (6.1). When the vacuum tank pressure transmitter detects a value less than this value, the vacuum pump will stop; when the vacuum tank pressure transmitter detects a value greater than this value, the vacuum pump will restart to maintain stable pressure in the pipe; connect the air pipe to the air inlet (8.1), close valve four (9.4) and valve seven (9.7), and open the air source switch. At this time, compressed air flows from... The air inlet (8.1) enters the air filter (2), which absorbs moisture and impurities in the compressed air to prevent moisture from entering the stator windings with the insulating varnish and causing a reduction in insulation. The purified compressed air enters the insulating varnish tank (5) through the insulating varnish tank inlet pipe (8.2). Since valve seven at the outlet is closed, a positive pressure is formed in the insulating varnish tank (5), which is displayed by the insulating varnish tank pressure transmitter (5.1) and the insulating varnish tank pressure gauge (5.2). The pressure value is set to 0.5MPa on the control panel (6.1). When the insulating varnish tank pressure transmitter (5.1) detects that the air pressure is greater than this value, valves one, three and seven are opened. At this time, the entire impregnation system is connected, forming a positive pressure on the low side of the stator and a negative pressure on the high side of the stator. Since there is insulating varnish in the insulating varnish tank (5), under the action of pressure, the insulating varnish enters the stator from the low side of the stator along the impregnation pipe two (8.5) and flows out from the high side of the stator to ensure that the insulating varnish can fill the entire stator. When insulating varnish is found to flow out of the impregnation pipe, valves 1 and 7 are closed to prevent the insulating varnish from entering the vacuum tank under pressure. If the valves are not closed in time, the glass sight glass (3) has a detection device that will automatically close valves 1 and 7 when the insulating varnish enters the glass sight glass. Valve 5 (9.5) is closed and valves 4 and 6 (9.6) are opened. At this time, the vacuum tank (4) is connected to the insulating varnish tank (5) to evacuate the insulating varnish tank (5). The pressure value is set to -0.1MPa on the control panel (6.1). When the pressure transmitter (5.1) of the insulating varnish tank detects that the pressure is less than this value, the vacuum pump (7) stops running, valve 6 (9.6) is closed, and valves 4 and 5 are closed. Open the valve, and compressed air enters the vacuum tank (4) through the pipeline. At this time, the vacuum tank (4) is under positive pressure and the insulating varnish tank (5) is under negative pressure. Set the pressure value to 0.5MPa on the control panel (6.1). When the vacuum tank pressure transmitter (4.1) detects a value greater than this value, open valve one and valve seven. At this time, the impregnation system is connected again. The high side of the stator is under positive pressure and the low side of the stator is under negative pressure. Excess insulating varnish in the pipeline and stator flows back to the insulating varnish tank (5) under pressure. After the insulating varnish has flowed back, open valve six (9.6) and close the air source switch. At this time, the pressure in the vacuum tank (4) and the insulating varnish tank (5) is balanced with the outside, and the impregnation process is completed.

10. The method for vacuum pressure impregnation of a submersible permanent magnet motor according to claim 9, characterized in that: The insulating varnish tank (5) is equipped with a magnetic float level gauge (5.4), which can monitor the remaining amount of insulating varnish in real time. When the amount of varnish is found to be too low, it needs to be replenished. When replenishing the varnish, the second varnish impregnation pipe (8.5) is placed into the insulating varnish tank, valves one, five and seven are closed, and the vacuum pump is turned on. At this time, the vacuum pump (7) is connected to the insulating varnish tank (5) through the vacuum tank (4), and the insulating varnish tank (5) forms a negative pressure. When the pressure is set to -0.1MPa on the control panel (6.1), valve seven is opened. Since the pipe is under negative pressure, the insulating varnish will be sucked into the insulating varnish tank (5) along the second varnish impregnation pipe. When the amount of varnish reaches the upper limit, valve seven is closed and the vacuum pump stops running. The closed valve is opened. At this time, the insulating varnish tank (5) is in equilibrium with the outside world, and the replenishment of insulating varnish is completed.

Images