Vacuum-pumping system of stator vacuum paint dipping tank

Abstract

The utility model provides a vacuumizing system of a stator vacuum paint dipping tank, and belongs to the technical field of motor production equipment. Comprising a paint dipping tank, a filtering tank, a pressure valve and a vacuum pump, a first exhaust connecting pipe is arranged at the upper part of the paint dipping tank; a paint connecting pipe is arranged at the bottom of the paint dipping tank; an air inlet connecting pipe is arranged at the lower part of the filtering tank; a second exhaust connecting pipe is arranged at the top of the filtering tank; a first pipeline is arranged between the first exhaust connecting pipe and the air inlet connecting pipe for communicating connection, one end of the pressure valve is connected with the second exhaust connecting pipe, and a second pipeline is arranged between the other end of the pressure valve and the air inlet end of the vacuum pump for communicating connection. The device has the advantages of being good in vacuum keeping effect, capable of achieving self-cleaning and the like.

Description

Technical Field

[0001] This utility model belongs to the technical field of motor production equipment and relates to a vacuum system for a stator vacuum impregnation tank. Background Technology

[0002] After winding, the entire stator must undergo VPI vacuum impregnation treatment. The specific process is as follows: pre-baking for 8 hours at 80℃, cooling to 40℃, evacuating to 100Pa, maintaining vacuum for 6 hours, and then impregnating with F-grade epoxy solvent-free insulating varnish to ensure the varnish fully fills the gaps between the coil insulation layer and between the coil and the core. Depressurize, return the varnish, and dry again for 16 hours at 160℃ until the insulation resistance value stabilizes. During impregnation, it is crucial to ensure that it does not affect the motor's subsequent heat dissipation and effectively prevents wear at the coil ends. After vacuum pressure impregnation, the coil should meet the national standards for motors in humid tropical regions and possess good moisture-proof and corrosion-resistant properties.

[0003] In the prior art, when a vacuum tank is evacuated, volatile substances and other residual impurities in the vacuum tank and pipeline are carried by the airflow to the vacuum pressure valve and then adhere to the ball surface of the pressure valve. As the pressure valve is frequently opened and closed, the adhered impurities will cause scratches on the ball surface of the pressure valve, resulting in the pressure valve not closing tightly and causing air leakage, making it impossible to maintain the vacuum level in the vacuum tank for a long time. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by providing a stator vacuum impregnation tank vacuum system, which aims to prevent the pressure valve spherical surface from being scratched, thus ensuring the vacuum level inside the vacuum tank is maintained.

[0005] The objective of this utility model can be achieved through the following technical solution: a stator vacuum impregnation tank vacuum system, characterized in that the system includes an impregnation tank, a filter tank, a pressure valve, and a vacuum pump; the upper part of the impregnation tank is provided with a first exhaust pipe, and the bottom of the impregnation tank is provided with a paint pipe; the lower part of the filter tank is provided with an air inlet pipe, and the top of the filter tank is provided with a second exhaust pipe; a first pipe is provided between the first exhaust pipe and the air inlet pipe for conductive connection, one end of the pressure valve is connected to the second exhaust pipe, and the other end of the pressure valve is provided with a second pipe for conductive connection to the air inlet of the vacuum pump.

[0006] Preferably, the filter tank includes a tank body and a top cover, which are fixed together by bolts, and a sealing ring is provided between the top cover and the tank body; the air inlet pipe is fixed to the lower side wall of the tank body, and the end of the air inlet pipe inside the tank body is bent downwards; the bottom end of the tank body is provided with a drain pipe, and the drain pipe is provided with a bottom cover that can seal the drain pipe; the second exhaust pipe is fixed to the top cover; a plate and frame filter element is detachably connected to the tank body above the air inlet pipe; a first branch pipe and a second branch pipe are connected to the second pipe, and a first valve and a second valve are respectively provided on the first branch pipe and the exhaust end of the vacuum pump; a third pipe is connected to the third pipe, and a third valve is provided on the third branch pipe.

[0007] Preferably, a mesh plate is detachably connected inside the top cover.

[0008] The advantages of this utility model are:

[0009] 1. In this vacuum system, we install a filter tank at the front end of the pressure valve to prevent impurities carried in the airflow from adhering to the ball surface of the pressure valve and causing scratches. This effectively prevents air leakage from the pressure valve, thus ensuring the vacuum level of the impregnation tank and guaranteeing the impregnation quality of the stator.

[0010] 2. Therefore, by switching the opening and closing states of each valve, this system can not only perform vacuuming but also complete the self-cleaning of the filter tank, making it more convenient to use and extending its maintenance cycle. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this vacuum system.

[0012] Figure 2 This is a schematic diagram of the internal structure of the filter tank.

[0013] In the diagram, 1. Impregnation tank; 11. First exhaust pipe; 12. Paint pipe; 2. Filter tank; 21. Inlet pipe; 22. Second exhaust pipe; 23. Tank body; 24. Top cover; 25. Sealing ring; 26. Drain pipe; 27. Bottom cover; 28. Plate and frame filter element; 29. ​​Mesh plate; 3. Pressure valve; 4. Vacuum pump; 5. First pipeline; 6. Second pipeline; 61. First branch pipe; 62. Second branch pipe; 63. First valve; 64. Second valve; 7. Third pipeline; 71. Third branch pipe; 72. Third valve. Detailed Implementation

[0014] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0015] like Figure 1 As shown, a stator vacuum impregnation tank system includes an impregnation tank 1, a filter tank 2, a pressure valve 3, and a vacuum pump 4. The impregnation tank 1 has a first exhaust pipe 11 at its upper part and a paint pipe 12 at its bottom. The filter tank 2 has an air inlet pipe 21 at its lower part and a second exhaust pipe 22 at its top. A first pipe 5 connects the first exhaust pipe 11 and the air inlet pipe 21. One end of the pressure valve 3 is connected to the second exhaust pipe 22, and the other end of the pressure valve 3 is connected to the air inlet of the vacuum pump 4 via a second pipe 6. In this vacuum system, the filter tank 2 is installed at the front end of the pressure valve 3, so that the air drawn from the impregnation tank 1 is filtered by the filter tank 2 before flowing to the pressure valve 3. This prevents impurities carried in the airflow from adhering to the spherical surface of the pressure valve 3 and causing scratches, thus effectively preventing air leakage from the pressure valve 3, ensuring the vacuum level of the impregnation tank 1, and guaranteeing the impregnation quality of the stator.

[0016] like Figure 1 and Figure 2 As shown, the filter tank 2 includes a tank body 23 and a top cover 24. The top cover 24 and the tank body 23 are fixed together by bolts, and a sealing ring 25 is provided between the top cover 24 and the tank body 23. The air inlet pipe 21 is fixed on the lower side wall of the tank body 23, and the end of the air inlet pipe inside the tank body 23 is bent downward. The bottom end of the tank body 23 is provided with a drain pipe 26, and a bottom cover 27 is provided on the drain pipe 26 to seal the drain pipe 26. The second exhaust pipe 22 is fixed on the top cover 24. A plate and frame filter element 28 is detachably connected to the tank body 23 above the air inlet pipe 21. The second pipe 6 is connected to a first branch pipe 61 and a second branch pipe 62. The first branch pipe 61 and the second branch pipe 62 are respectively provided with a first valve 63 and a second valve 64. A third pipe 7 is provided between the first valve 63 and the exhaust end of the vacuum pump 4. The third pipe 7 is connected to a third branch pipe 71, and the third branch pipe 71 is provided with a third valve 72.

[0017] When this system is evacuated, we open pressure valve 3 and third valve 72, and close first valve 63, third valve 72, and bottom cover 27. The air in the impregnation tank 1 will be driven by vacuum pump 4, passing sequentially through filter tank 2, pressure valve 3, vacuum pump 4, and finally discharged to the external environment through second valve 64 (airflow path as follows). Figure 2(As shown by the solid arrow in the middle), thus achieving the vacuuming operation of the impregnation tank 1. When the airflow passes through the filter tank 2, it enters through the air inlet pipe 21, passes through the plate and frame filter element 28, and is discharged through the second exhaust pipe 22. During this process, due to the large internal space of the filter tank 2, the airflow speed inside will decrease, so the particulate impurities mixed in the airflow will automatically fall into the drain pipe 26 at the bottom of the tank body 23; and the downward bend of the air inlet pipe 21 can further reduce the airflow speed, allowing as many impurities as possible to fall into the drain pipe 26.

[0018] Before each vacuuming operation, while ensuring the impregnation tank 1 is sealed, open pressure valve 3, first valve 63, third valve 72, and bottom cover 27 of filter tank 2, close second valve 64, and start vacuum pump 4. Vacuum pump 4 will then allow outside air to enter through third valve 72, and subsequently pass through vacuum pump 4, first valve 63, and pressure valve 3 into filter tank 2, blowing it from top to bottom towards plate and frame filter element 28 (airflow path as shown). Figure 2 (As shown by the dashed arrow), the filter element 28 is then backwashed, blowing away the dust previously left on its lower surface, thus cleaning the filter element 28. During this process, because the impregnation tank 1 is sealed, the airflow will not flow back into the impregnation tank 1 through the air inlet pipe 21, but will only carry the flushed dust out through the drain pipe 26. Therefore, by switching the opening and closing states of the first valve 63, the second valve 64, and the third valve 72, this system can perform both vacuuming and self-cleaning of the filter tank 2, making it more convenient to use and extending its maintenance cycle.

[0019] like Figure 2 As shown, a mesh plate 29 is detachably connected inside the top cover 24. The presence of the mesh plate 29 allows the airflow to be concentrated below the second exhaust pipe 22 during self-cleaning, thus reducing the cleaning area. Therefore, we installed the mesh plate 29 inside the top cover 24 to distribute the airflow evenly, thereby cleaning the plate and frame filter element 28 more thoroughly.

[0020] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A stator vacuum impregnation tank vacuum system, characterized in that, The system includes an impregnation tank (1), a filter tank (2), a pressure valve (3), and a vacuum pump (4); the upper part of the impregnation tank (1) is provided with a first exhaust pipe (11), and the bottom of the impregnation tank (1) is provided with a paint pipe (12); the lower part of the filter tank (2) is provided with an air inlet pipe (21), and the top of the filter tank (2) is provided with a second exhaust pipe (22); a first pipe (5) is provided between the first exhaust pipe (11) and the air inlet pipe (21) for conduction connection; one end of the pressure valve (3) is connected to the second exhaust pipe (22), and the other end of the pressure valve (3) is provided with a second pipe (6) for conduction connection between the air inlet end of the vacuum pump (4).

2. The stator vacuum impregnation tank vacuum system according to claim 1, characterized in that, The filter tank (2) includes a tank body (23) and a top cover (24), which are fixed together by bolts, and a sealing ring (25) is provided between the top cover (24) and the tank body (23); the air inlet pipe (21) is fixed on the lower side wall of the tank body (23), and the end of the air inlet pipe inside the tank body (23) is bent downward; the bottom end of the tank body (23) is provided with a drain pipe (26), and a bottom cover (27) that can seal the drain pipe (26) is provided on the drain pipe (26); the second exhaust pipe (22) is fixed on the top cover (24). The tank (23) is detachably connected to the air inlet pipe (21) above the tank body (23); the second pipe (6) is connected to the first branch pipe (61) and the second branch pipe (62), the first branch pipe (61) and the second branch pipe (62) are respectively provided with the first valve (63) and the second valve (64), and the first valve (63) and the exhaust end of the vacuum pump (4) are connected to the third pipe (7); the third pipe (7) is connected to the third branch pipe (71), and the third branch pipe (71) is provided with the third valve (72).

3. The stator vacuum impregnation tank vacuum system according to claim 2, characterized in that, A mesh plate (29) is detachably connected inside the top cover (24).

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