Dipping device for motor stator

Abstract

The invention discloses an impregnation device for a motor stator, which comprises an impregnation tank, a support frame for placing the motor stator is arranged in the impregnation tank, a heating module and a vacuumizing module are also arranged in the impregnation tank, and a filling module and a grading pressurizing module are also arranged on the impregnation tank. The filling module is used for filling insulating resin into the impregnating tank; the graded pressurizing module is used for increasing the pressure on the insulating resin in a graded manner; meanwhile, the dipping device further comprises a controller, and the controller is electrically connected with the heating module, the vacuumizing module, the filling module and the grading pressurizing module. Compared with the prior art, moisture and air in the small gaps of the stator winding are discharged in a vacuum extraction and heating mode, then uniform extrusion force is applied to the insulating resin in a gas pressurization mode, and the insulating resin is forced to permeate into the motor stator through the extrusion force. All gaps of the motor stator are filled, and the dipping effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor production equipment, in particular to a kind of for motor stator impregnation device. BACKGROUND

[0002] Motor stator impregnation is the insulation process in motor manufacturing process, refers to the motor stator (consisting of core and winding) is immersed in insulating impregnating varnish or insulating resin, or by other means make impregnating varnish fill the gap of stator winding, interstice and the gap between insulation layer, after curing form dense insulation layer process.The core purpose is to improve the insulation performance of stator, mechanical properties and environmental adaptability, guarantee long-term stable operation of motor;

[0003] Traditional static impregnation device relies on gravity and capillary action to let varnish penetrate, but air in the gap between motor stator winding is difficult to discharge, easy to form bubble residual, lead to impregnation blind area, unable to fill the small gap of stator winding, resulting in poor impregnation effect. SUMMARY

[0004] The main purpose of the present application is to provide a kind of for motor stator impregnation device, to solve the defects of poor impregnation effect in prior art.

[0005] The present application realizes the above-mentioned purpose by the following technical scheme:

[0006] A kind of for motor stator impregnation device, including impregnation tank;

[0007] Support frame, the support rod frame is set in the impregnation tank, the support frame is used to place the motor stator to be impregnated;

[0008] Heating module, the heating module is set in the impregnation tank, the impregnation tank is also provided with vacuumizing module, the heating module and the vacuumizing module are used to extract moisture and air in motor stator;

[0009] Filling module, the filling module is communicated with the impregnation tank, the filling module is used to fill insulating resin in the impregnation tank;

[0010] Staged pressurization module, the staged pressurization module is connected with the impregnation tank, the staged pressurization module is used to increase the pressure received by insulating resin;

[0011] Controller, the controller is electrically connected with the heating module, vacuumizing module, filling module and the staged pressurization module respectively.

[0012] Optionally, the impregnation tank comprises a tank body and a sealing cover which are adapted to each other, the tank body is provided with a sealing groove, and the sealing cover is provided with a sealing strip which is adapted to the sealing groove; the tank body is further provided with fastening devices for fixing the sealing cover.

[0013] Optionally, the fastening devices comprise a plurality of electric push rods, the electric push rods are provided with U-shaped clamps, the U-shaped clamps are symmetrically provided with upper clamping rollers and lower clamping rollers, the upper clamping rollers are closely combined with the top surface of the sealing cover, and the lower clamping rollers are closely combined with the tank body.

[0014] Optionally, the support frame comprises a support plate and a plurality of support columns, the support columns are arranged around the axis of the impregnation tank, one end of each of the support columns is connected to the impregnation tank, and the other end of each of the support columns is connected to the support plate.

[0015] Optionally, the support plate is provided with a plurality of adjusting slide rails, the adjusting slide rails are radially arranged around the axis of the support plate; each of the adjusting slide rails is slidably provided with a stand which has a conical structure, the large end of the stand is slidably connected to the adjusting slide rail, and the small end of the stand abuts against the motor stator to be impregnated.

[0016] Optionally, the heating module comprises electric heating plates, the tank body is provided with a heating interlayer, and each of the electric heating plates is arranged in the heating interlayer; the sealing cover is further provided with a temperature sensor which is electrically connected to the controller.

[0017] Optionally, the vacuumizing module comprises a vacuum pump and a vacuum pipe, the sealing cover is provided with a vacuum interface, and the vacuum pipe is connected to the vacuum interface; the vacuum interface is further provided with an adjusting valve which is electrically connected to the controller.

[0018] Optionally, the filling module comprises a temporary storage tank, the outlet end of the temporary storage tank is communicated with the tank body through a feeding pipe, the temporary storage tank is further provided with a resin filling pipe and an auxiliary vacuum pipe, the auxiliary vacuum pipe is communicated with the vacuum pipe, and the feeding pipe, the resin filling pipe and the auxiliary vacuum pipe are all provided with adjusting valves.

[0019] Optionally, the stepwise pressurizing module comprises a gas storage tank and a pressurizing pump which are connected to each other, the outlet end of the pressurizing pump is connected in parallel to a plurality of pressurizing tanks, the sealing cover is provided with a plurality of pressurizing openings, the outlet end of each of the pressurizing tanks is connected to each of the pressurizing openings, and the inlet end and the outlet end of each of the pressurizing tanks are both provided with adjusting valves for adjusting the on-off state thereof.

[0020] Optionally, the outlet end of each of the pressurizing openings is provided with an exhaust pipe, a plurality of exhaust holes are arranged on the outer circumferential surface of the exhaust pipe around the axis of the exhaust pipe.

[0021] Compared with the prior art, the application has the following beneficial effects:

[0022] The application comprises an impregnation tank, a support frame for placing a motor stator is arranged in the impregnation tank, a heating module and a vacuumizing module are also arranged in the impregnation tank, a filling module and a staged pressurizing module are also arranged on the impregnation tank, the filling module is used for filling insulating resin into the impregnation tank, and the staged pressurizing module is used for increasing the pressure on the insulating resin in stages; meanwhile, the impregnation device also comprises a controller, which is electrically connected with the heating module, the vacuumizing module, the filling module and the staged pressurizing module respectively.

[0023] In use, the motor stator to be impregnated is placed on the support frame, and then the impregnation tank is closed, the temperature in the impregnation tank is increased by the heating module, so that the moisture inside the motor stator is evaporated, and a vacuum environment is formed in the impregnation tank by the vacuumizing module while high-temperature heating is performed, the air and water vapor in the small gaps inside the motor stator are quickly extracted under the action of the internal and external pressure difference, so that the small gaps inside the motor stator are quickly and efficiently pretreated, and the impregnation effect is improved.

[0024] Then, the insulating resin is input into the impregnation tank by the filling module until the insulating resin completely immerses the motor stator, then the filling is stopped, and the top region of the impregnation tank is kept empty, at this time, different pressures of gas (nitrogen or inert gas) are input into the empty region of the top of the impregnation tank by the staged pressurizing module in batches, and the pressure of the input gas is increased in stages, so as to gradually increase the pressure in the impregnation tank, so that a large extrusion force is uniformly applied to the top of the insulating resin by the gas, the extrusion force will continuously extrude the insulating resin to penetrate into the interior of the motor stator, and then fill all the gaps of the motor stator, thereby improving the impregnation effect.

[0025] Compared with the prior art, the application realizes the rapid pretreatment of the motor stator by heating and vacuum treatment, removes the obstacles for the penetration of the insulating resin into the interior of the motor stator, so as to ensure the impregnation effect; then, the insulating resin is forced to penetrate into the interior of the motor stator by forming a high-pressure area on the top of the impregnation tank by the high-pressure gas, which can effectively improve the penetration efficiency of the insulating resin compared with the natural penetration mode, thereby improving the processing efficiency of the motor stator.

[0026] Secondly, the liquid level of the insulating resin only needs to be slightly higher than the top surface of the motor stator during production, so it can effectively reduce the amount of insulating resin, thereby reducing the waste of materials; meanwhile, the excess insulating resin can be recycled after impregnation, thereby further reducing the waste of materials and improving economic benefits.

[0027] Finally, the application forms a high-pressure area on the top of the impregnation tank by means of gas pressurization, the force of the gas on the insulating resin is uniformly applied to the entire liquid surface of the insulating resin, which ensures uniform distribution of the force and uniform penetration of the insulating resin; at the same time, the pressure received by the insulating resin can be flexibly adjusted by adjusting the gas pressure, the use of the equipment is more flexible, and the impregnation requirements of various motor stators can be met, and the above adjustment method has the advantages of simple adjustment, fast response speed, etc., effectively ensuring the impregnation effect of the motor stator. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 A structural schematic diagram of an impregnation device for a motor stator is provided for embodiment 1 of the application;

[0029] Figure 2 An exploded view of an impregnation device for a motor stator is provided for embodiment 1 of the application;

[0030] Figure 3 An exploded view of an impregnation tank is provided for embodiment 1 of the application;

[0031] Figure 4 A sectional view of an impregnation tank is provided for embodiment 1 of the application;

[0032] Figure 5 A principle diagram of pressurized impregnation is provided;

[0033] The drawings show that: 1-impregnation tank, 2-support frame, 3-controller, 4-electric push rod, 5-U-shaped clamp, 6-upper clamping roller, 7-lower clamping roller, 8-electric heating plate, 9-heating interlayer, 10-temperature sensor, 11-vacuum pump, 12-vacuum pipe, 13-vacuum interface, 14-regulating valve, 15-temporary storage tank, 16-feeding pipe, 17-resin filling pipe, 18-assisted vacuum pipe, 19-gas storage tank, 20-pressurization pump, 21-pressurization tank, 22-pressurization port, 23-exhaust pipe, 24-exhaust hole, 101-tank body, 102-sealing cover, 103-sealing groove, 104-sealing strip, 201-supporting plate, 202-supporting column, 203-adjusting slide rail, 204-stand column, 301-motor stator, 302-insulating resin liquid surface, 303-gas pressure direction.

[0034] The purpose, functional characteristics and advantages of the application will be further described in conjunction with the embodiments and with reference to the drawings. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0036] It should be noted that all directional indications, such as up, down, left, right, front, back, etc., in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0037] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal connection of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In addition, if the present application has a description of "first", "second", etc., the description of "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. For example, "A and / or B" includes A scheme or B scheme or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of those skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application.

[0039] Embodiment 1:

[0040] With reference to Figures 1 to 5 , the present embodiment is an optional embodiment of the present application, which discloses an impregnation device for motor stator, comprising an impregnation tank 1 and a controller 3, the impregnation tank 1 comprises a tank body 101 and a sealing cover 102, wherein the top of the sealing cover 102 is connected with external hoisting equipment, so as to realize the disassembly and installation of the sealing cover 102;

[0041] The outer circumferential surface of the top of the tank body 101 is provided with a flange, and the sealing cover 102 is also provided with a flange. The flange surface of the top of the tank body 101 is provided with a sealing groove 103, and the flange bottom surface of the sealing cover 102 is provided with a sealing strip 104. After assembly, the sealing strip 104 is inserted into the sealing groove 103, thereby improving the sealing performance of the immersion tank 1.

[0042] Further, the tank body 101 is also provided with a plurality of fastening devices, each of which has the same structure. Each of the fastening devices is uniformly arranged around the axis of the tank body 101. Each of the fastening devices also includes an electric push rod 4 arranged on the support table on the outer circumferential surface of the tank body 101. A U-shaped clamp 5 is arranged on the output shaft of the electric push rod 4. An upper clamping roller 6 and a lower clamping roller 7 are symmetrically arranged on the U-shaped clamp 5. The upper clamping roller 6 is closely attached to the top surface of the sealing cover 102, and the lower clamping roller 7 is closely attached to the tank body 101.

[0043] When the sealing cover 102 is completely closed with the tank body 101, the U-shaped clamp 5 is pushed by the electric push rod 4 to move one side of the tank body 101 and the sealing cover 102. The combination of the tank body 101 and the sealing cover 102 will gradually be inserted between the upper clamping roller 6 and the lower clamping roller 7. The upper clamping roller 6 is closely attached to the top surface of the sealing cover 102, and the lower clamping roller 7 is closely attached to the tank body 101. Thus, the tank body 101 and the sealing cover 102 are completely closed, ensuring the sealing performance of the immersion tank 1.

[0044] Secondly, the arrangement of the upper clamping roller 6 and the lower clamping roller 7 can effectively reduce the resistance during the insertion process and also reduce the wear of the equipment.

[0045] Further, the bottom of the tank body 101 is also provided with a support frame 2. The support frame 2 includes a support plate 201 and a plurality of support columns 202. Each of the support columns 202 is arranged around the axis of the immersion tank 1. One end of each of the support columns 202 is connected to the immersion tank 1, and the other end is connected to the support plate 201.

[0046] Meanwhile, a plurality of adjustment sliding rails 203 are arranged on the top surface of the support plate 201. Around the axis of the support plate 201, each of the adjustment sliding rails 203 is radially arranged. Each of the adjustment sliding rails 203 is a T-shaped sliding rail. A vertical column 204 is slidably arranged on each of the adjustment sliding rails 203. The vertical column 204 has a conical structure. The large end of the vertical column 204 is slidably connected to the adjustment sliding rail 203, and the small end of the vertical column 204 abuts against the bottom surface of the motor stator 301 to be immersed. A locking screw is threadedly connected to the vertical column 204.

[0047] In use, the position of the column 204 can be flexibly adjusted by adjusting the slide rail 203 to meet the placement requirements of different stators. At the same time, the conical column 204 supports the motor stator 301, which can minimize the contact area between the equipment and the motor stator 301 while ensuring installation stability, thereby improving the impregnation quality.

[0048] Furthermore, several radial through holes can be provided at the top of the column 204, which connect to the top of the column 204 in the axial direction, thereby further reducing the contact area between the column 204 and the motor stator 301.

[0049] Furthermore, a heating jacket 9 is provided on the outer circumferential surface of the tank body 101. The impregnation device includes a heating module and a vacuum module, wherein the heating module includes an electric heating plate 8, which is disposed within the heating jacket 9. A temperature sensor 10 electrically connected to the controller 3 is also provided on the sealing cover 102.

[0050] The heating module can quickly increase the temperature inside the tank 101, and the heating jacket 9 can reduce heat loss, thereby reducing energy consumption.

[0051] Furthermore, the impregnation device also includes a vacuuming module and a filling module. The vacuuming module includes a vacuum pump 11 and a vacuum tube 12. A vacuum interface 13 is provided on the sealing cover 102, and the vacuum tube 12 is connected to the vacuum interface 13. A regulating valve 14 electrically connected to the controller 3 is also provided on the vacuum interface 13.

[0052] The filling module includes a temporary storage tank 15, the bottom of which is the outlet end. A conveying pipe 16 is provided at the outlet end, and the conveying pipe 16 is connected to the tank body 101. It should be noted that the conveying pipe 16 is arranged through an L-shaped structure, and its inlet end is arranged upward, so as to ensure that the temporary storage tank 15 is always higher than the connection end between the tank body 101 and the conveying pipe 16, thereby achieving the filling of insulating resin by its own weight.

[0053] A resin filling pipe 17 and an auxiliary vacuum pipe 18 are also provided on the top of the temporary storage tank 15. The auxiliary vacuum pipe 18 is connected to the vacuum pipe 12 as a branch pipe. A regulating valve 14 is provided on the material conveying pipe 16, the resin filling pipe 17 and the auxiliary vacuum pipe 18.

[0054] When using, refer to Figure 5The motor stator 301 is placed on the column 204. First, a vacuuming operation is performed by the vacuuming module. At this time, the auxiliary vacuum tube 18 is closed. Meanwhile, the temporary storage tank 15 contains insulating resin. The liquid level of the insulating resin is shown in the figure. When the vacuuming is completed and it is necessary to add insulating resin, the regulating valve 14 on the vacuum tube 12 is closed, and the regulating valve 14 on the auxiliary vacuum tube 18 is opened. At this time, the vacuum pump 11 will perform a vacuuming operation in the temporary storage tank 15 until the vacuum degree in the temporary storage tank 15 is the same as or within the allowable error range of the vacuum degree in the impregnation tank 1. Then, the regulating valve 14 on the feed pipe 16 is opened. At this time, the insulating resin flows into the impregnation tank 1 under its own gravity.

[0055] The above method can achieve the addition of insulating resin under the same pressure. On the one hand, it can avoid disrupting the vacuum environment inside the impregnation tank 1 during the filling process. On the other hand, it can also prevent the insulating resin from splashing and impacting the motor stator 301 during the filling process due to pressure difference, thus ensuring the stability of the insulating resin filling process.

[0056] Furthermore, the impregnation device also includes a staged pressurization module, which includes a gas storage tank 19, a pressurization pump 20, and a plurality of pressurization tanks 21. The gas storage tank 19 is used to store nitrogen or inert gas for pressurization. The inlet end of the pressurization pump 20 is connected to the outlet end of the gas storage tank 19, and the outlet end of the pressurization pump 20 is connected in parallel to each of the pressurization tanks 21.

[0057] A plurality of pressure ports 22 are provided on the sealing cover 102, and the outlet end of each pressure tank 21 is connected to each pressure port 22 respectively; each pressure tank 21 is provided with a regulating valve 14 for adjusting its on / off state at both the inlet end and the outlet end.

[0058] During use, a reference pressure is set for each pressure tank 21 according to the actual situation. Each reference pressure increases sequentially according to a certain growth rate. Then, the gas in the gas storage tank 19 is drawn by the pressure pump 20 and injected into each pressure tank 21 until the pressure of the pressure tank 21 reaches the set pressure value. Then, all regulating valves 14 of the staged pressurization module are closed.

[0059] After the insulating resin is filled, first open the regulating valve 14 on the connecting pipeline between the lowest pressure tank 21 and the impregnation tank 1, so that the impregnation tank 1 is pressurized through the pressure tank 21. When the pressure is balanced, disconnect the pressure tank 21 of the machine and open the next higher pressure tank 21 according to the pressure size to carry out the pressurization operation. Repeat the above steps and open each level of pressure tank 21 in sequence according to the principle of increasing pressure until the pressure of the impregnation tank 1 reaches the set pressure.

[0060] The aforementioned graded pressurization module enables graded pressurization of the impregnation tank 1, and its structure is simple and easy to operate. Graded pressurization can achieve orderly pressurization of the impregnation tank 1, ensuring that the pressure inside the impregnation tank 1 is within a controllable range. On the other hand, it can prevent drastic fluctuations in the gas pressure inside the impregnation tank 1, which could lead to gas impacting the insulating resin and motor stator 301, thus ensuring the stability inside the impregnation tank 1 and improving the safety of the equipment production process.

[0061] At the same time, it can ensure that the stress on the insulating resin can be stably increased, thereby ensuring that the insulating resin has sufficient penetration and wetting time, ensuring that the motor stator 301 is fully impregnated by the insulating resin, and improving the impregnation effect.

[0062] Furthermore, an exhaust pipe 23 is provided at the outlet end of each of the pressurization ports 22, and a plurality of exhaust holes 24 are provided on the outer circumferential surface of the exhaust pipe 23 around the axis of the exhaust pipe 23.

[0063] The above configuration allows axial exhaust to be changed to radial exhaust, which increases the exhaust area and thus improves pressurization efficiency and production efficiency within a controllable range. On the other hand, when the gas is radially introduced, it will not come into direct contact with the insulating resin, thereby reducing the disturbance to the insulating resin during pressurization and ensuring that the stress on the insulating resin increases gradually. Moreover, the above structure is simple and reliable.

[0064] When using this application, the motor stator 301 to be impregnated is first placed on the support frame 2, and the top of the column 204 is in contact with the bottom surface of the motor stator 301, thereby supporting the insulated stator.

[0065] Then, the sealing cap 102 is installed, and the tank body 101 is sealed to the sealing cap 102 by the fastening device, thereby sealing the impregnation tank 1. The temperature inside the impregnation tank 1 is increased by the heating module, thereby evaporating the moisture inside the motor stator 301. While the high temperature is being heated, a vacuum environment is also created inside the impregnation tank 1 by the vacuum module. The air and water vapor in the small gaps inside the motor stator 301 will be quickly extracted under the action of the internal and external pressure difference, thereby quickly and efficiently pre-treating the small gaps inside the motor stator 301 and improving the impregnation effect.

[0066] Subsequently, air is extracted from the temporary storage tank 15 using vacuum pump 11 and auxiliary vacuum tube 18. Vacuuming is stopped when the vacuum level in the temporary storage tank 15 is the same as or within the allowable error range of the impregnation tank 1. The feed pipe 16 is then opened, and the insulating resin flows into the impregnation tank 1 under its own gravity. The filling module feeds insulating resin into the impregnation tank 1 until the motor stator 301 is completely submerged, and the level of the insulating resin is as shown in the image. Figure 5 As shown, then stop adding fuel to ensure that the top area of ​​the impregnation tank 1 is empty;

[0067] At this point, gases (nitrogen or inert gas) at different pressures are introduced into the empty area above the impregnation tank 1 in batches through the graded pressurization module, with the pressure of the input gas gradually increasing to progressively raise the pressure inside the impregnation tank 1. This results in a relatively large compressive force being uniformly applied to the top of the insulating resin by the gas. The compressive force is referenced from... Figure 5 The air pressure direction is as follows: air enters from the pressurization port. The pressure is mainly applied by increasing the air pressure inside the tank. The high-pressure gas inside the tank acts evenly on the liquid surface, so the force is uniform. The above-mentioned pressure will continuously squeeze the insulating resin into the interior of the motor stator 301, thereby filling all the gaps in the motor stator 301 and improving the impregnation effect.

[0068] Compared with the prior art, this application achieves rapid pretreatment of the motor stator through heating and vacuum treatment, removing obstacles to the penetration of insulating resin into the motor stator, thereby ensuring the impregnation effect; subsequently, high-pressure gas is used to form a high-pressure zone at the top of the impregnation tank to force the insulating resin to penetrate into the motor stator. While improving the impregnation effect, it can effectively improve the penetration efficiency of insulating resin compared with natural penetration, thereby improving the processing efficiency of the motor stator.

[0069] Secondly, in the production process of this application, the liquid level of the insulating resin only needs to be slightly higher than the top surface of the motor stator, which can effectively reduce the amount of insulating resin used and thus reduce material waste; at the same time, the excess insulating resin after impregnation can be recycled and reused, thereby further reducing material waste and improving economic efficiency.

[0070] Finally, this application creates a high-pressure zone at the top of the impregnation tank by pressurizing the gas. The force exerted by the gas on the insulating resin is evenly applied to the entire surface of the insulating resin, ensuring a uniform distribution of the force and uniform penetration of the insulating resin. At the same time, the pressure on the insulating resin can be flexibly adjusted by regulating the gas pressure. The equipment is not only more flexible to use, but also meets the impregnation requirements of various motor stators. Furthermore, the above adjustment method has the advantages of simple adjustment and fast response speed, effectively ensuring the impregnation effect of the motor stator.

[0071] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An impregnation device for a stator of an electrical machine, characterized in that The impregnation tank (1) is provided with a support frame (2) for placing the motor stator (301) to be impregnated, a heating module, a vacuumizing module, a filling module and a stepwise pressurizing module. The impregnation tank (1) is provided with a support frame (2) for placing the motor stator (301) to be impregnated, a heating module, a vacuumizing module, a filling module and a stepwise pressurizing module. The impregnation tank (1) is provided with a support frame (2) for placing the motor stator (301) to be impregnated, a heating module, a vacuumizing module, a filling module and a stepwise pressurizing module. The impregnation tank (1) is provided with a support frame (2) for placing the motor stator (301) to be impregnated, a heating module, a vacuumizing module, a filling module and a stepwise pressurizing module. The impregnation tank (1) is provided with a support frame (2) for placing the motor stator (301) to be impregnated, a heating module, a vacuumizing module, a filling module and a stepwise pressurizing module. The controller (3) is electrically connected with the heating module, the vacuumizing module, the filling module and the stepwise pressurizing module respectively.

2. An impregnation apparatus for a stator of an electrical machine according to claim 1, characterized in that The impregnation tank (1) comprises a tank body (101) and a sealing cover (102) which are adapted to each other.

3. An impregnation apparatus for a stator of an electrical machine according to claim 2, characterized in that The tank body (101) is provided with a sealing groove (103), and the sealing cover (102) is provided with a sealing strip (104) which is adapted to the sealing groove (103).

4. The impregnation apparatus for a stator of an electric machine according to claim 1, characterized in that, The tank body (101) is further provided with fastening devices for fixing the sealing cover (102).

5. An impregnation apparatus for a stator of an electrical machine according to claim 4, characterized in that The fastening devices comprise a plurality of electric push rods (4) which are provided with U-shaped clamps (5).

6. An impregnation apparatus for a stator of an electrical machine according to claim 2, characterized in that The U-shaped clamps (5) are symmetrically provided with upper clamping rollers (6) and lower clamping rollers (7).

7. An impregnation apparatus for a stator of an electrical machine according to claim 2, characterized in that The support frame (2) comprises a support plate (201) and a plurality of support columns (202). The support plate (201) is provided with a plurality of adjusting slide rails (203) which are arranged radially around the axis of the support plate (201). Each adjusting slide rail (203) is slidably provided with a stand column (204) which has a conical structure. The heating module comprises electric heating plates (8) which are arranged in heating interlayers (9) provided on the tank body (101). The sealing cover (102) is further provided with temperature sensors (10) which are electrically connected with the controller (3). The vacuumizing module comprises a vacuum pump (11) and a vacuum pipe (12). The sealing cover (102) is provided with a vacuum interface (13) which is connected with the vacuum pipe (12). The vacuum interface (13) is further provided with adjusting valves (14) which are electrically connected with the controller (3).

8. An impregnation apparatus for a stator of an electrical machine according to claim 2, characterized in that The filling module comprises a temporary storage tank (15), an outlet end of the temporary storage tank (15) is communicated with the tank body (101) through a feeding pipe (16), the temporary storage tank (15) is further provided with a resin filling pipe (17) and an auxiliary vacuum pipe (18), the auxiliary vacuum pipe (18) is communicated with the vacuum pipe (12); the feeding pipe (16), the resin filling pipe (17) and the auxiliary vacuum pipe (18) are all provided with adjusting valves (14).

9. An impregnation apparatus for a stator of an electrical machine according to claim 2, characterized in that The hierarchical pressure module comprises a gas storage tank (19) and a pressure pump (20) connected with each other, a plurality of pressure tanks (21) are connected in parallel at an outlet end of the pressure pump (20), a plurality of pressure openings (22) are arranged on the sealing cover (102), and an outlet end of each pressure tank (21) is connected with each pressure opening (22); an inlet end and an outlet end of each pressure tank (21) are both provided with adjusting valves (14) for adjusting on-off states thereof.

10. An impregnation apparatus for a stator of an electrical machine according to claim 9, characterized in that An outlet end of each pressure opening (22) is provided with an exhaust pipe (23), and a plurality of exhaust holes (24) are arranged on an outer peripheral surface of the exhaust pipe (23) around an axis of the exhaust pipe (23).

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