Motor vacuum paint dipping device

Abstract

The utility model discloses a motor vacuum paint dipping device, which belongs to the technical field of motor production and comprises a flexible vacuum bag, and an annular accommodating cavity is formed in the flexible vacuum bag. The whole motor stator is arranged in the containing cavity of the flexible vacuum bag, and the containing cavity surrounds the periphery of the outer contour of the stator to form a closed paint dipping space. The flexible vacuum bag is made of a deformable material and replaces a traditional rigid vacuum tank, the stator is wrapped with the flexible material, the equipment size and storage difficulty are reduced, and the equipment and site requirements can be reduced for the situation that secondary paint dipping is needed for motor maintenance. The annular containing cavity surrounds the stator to form a closed paint dipping space which is used for vacuumizing and pressurizing to achieve insulation paint permeation, the paint dipping space is limited around the outer contour of the stator through the self-formed shape of the flexible vacuum bag, paint liquid is prevented from flowing to redundant space, and the total paint liquid demand is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor production, and specifically relates to a motor vacuum impregnation device. Background Technique

[0002] With the increasing demand for high-power density and high-reliability motors in the industrial field, the stator sizes of large motors (such as wind turbines, industrial drive motors, etc.) are constantly increasing. As a mainstream stator insulation treatment process, vacuum pressure impregnation can significantly improve the density, thermal conductivity, and environmental resistance of the insulation layer by discharging the internal gas of the winding and pressurizing the impregnation of insulating paint in a vacuum environment.

[0003] The traditional vacuum pressure impregnation process requires the entire stator to be completely placed in a vacuum pressure tank for impregnation. For some medium and large-sized stators, it is necessary to configure an extra-large vacuum pressure tank. The equipment requires a dedicated site, and there are problems of large floor area and high configuration cost. In case of secondary impregnation during the later maintenance of the motor, it is very likely that the equipment and site conditions are not available. In addition, when impregnating a large stator, the entire vacuum tank needs to be filled with insulating paint, but the amount of paint actually penetrating into the winding only accounts for 20%-30% of the total amount. The remaining paint liquid has its viscosity changed due to contact with air or repeated circulation, and it is difficult to reuse. This not only causes waste of high-value insulating materials such as epoxy resin and polyester, but also increases the environmental protection pressure of waste paint treatment.

[0004] The patent with the publication number of CN103326525A discloses a motor stator winding vacuum pressure impregnation device and method with a machine base. This impregnation device abandons the traditional vacuum pressure tank, forms a vacuum impregnation cavity by surrounding the motor stator with two sealing cylinders, and then conducts vacuum pumping and insulating paint impregnation treatment. This device significantly reduces the vacuum pumping impregnation space, and thus reduces the demand for insulating paint, the vacuum pumping time, and the input and output time of insulating paint. However, this device uses a rigid cylinder and a cover assembly to surround the stator. Although it saves the vacuum and impregnation space, the rigid cylinder still has problems of large occupied space and difficult storage. Content of the Utility Model

[0005] The purpose of the utility model is to provide a motor vacuum impregnation device to solve the problems raised in the above-mentioned existing technologies.

[0006] Provide a motor vacuum impregnation device, including:

[0007] A flexible vacuum bag, which forms an annular accommodating cavity inside, and an extraction hole (12) for the stator winding lead-out wire to penetrate is opened on the flexible vacuum bag (1);

[0008] A sealing film (6), and the sealing film (6) covers the periphery of the flexible vacuum bag (1).

[0009] Furthermore, an opening is provided at one end of the flexible vacuum bag for the motor stator.

[0010] The single-end opening is applicable to the scenario where only a single-end lead-out wire is required for the stator winding. The opening facilitates the operation of the lead-out wire during assembly and allows it to penetrate through the wall of the flexible vacuum bag. The single-end opening simplifies the sealing structure, reduces potential leakage points to improve the vacuum degree and lower the risk of paint leakage.

[0011] Furthermore, openings are provided at both ends of the flexible vacuum bag for the motor stator respectively.

[0012] The double-end opening is adapted to the scenario where double-end lead-out is required for the stator winding, facilitating the operation of the two-end wiring during assembly to penetrate through the wall of the flexible vacuum bag from the two openings respectively.

[0013] Furthermore, a fastener is included for sealing the opening.

[0014] The fastener seals the opening by mechanical pressing to avoid vacuum leakage and paint leakage.

[0015] Furthermore, the fastener includes two flange plates, and the opening is clamped between the two flange plates.

[0016] The double-flange clamping design enhances the sealing reliability and is also convenient for disassembly and reuse. The flange plates clamp the edge of the opening of the flexible vacuum bag, applying uniform pressure through bolts or buckles to ensure that the sealing surface fits tightly against the end of the stator, avoiding paint leakage or vacuum failure during the dipping process.

[0017] Furthermore, a functional interface is provided on the flexible vacuum bag.

[0018] The functional interface is integrated on the surface of the flexible vacuum bag and is linked with a vacuum pump and a paint supply system through external pipelines to achieve precise control of process parameters (vacuum degree, paint injection speed, pressure). The reserved functional interface on the surface of the flexible vacuum bag facilitates the connection with various system pipelines after the assembly of the motor stator, reducing the operation complexity during the early preparation of the process.

[0019] Furthermore, a diversion layer is included, which covers the periphery of the motor stator.

[0020] Since the flexible vacuum bag has a large deformation ability, there are parts of the structure that fit tightly against the flexible vacuum bag after the motor stator is inserted. To avoid the difficulty of paint immersion in the fitting parts, a structural support is formed through the diversion layer to isolate the stator from the flexible vacuum bag, and the paint penetrates through the porous structure of the diversion layer itself, enabling the paint to come into contact with the stator smoothly.

[0021] Furthermore, it further includes a sealing film. The diversion layer includes a porous film and a diversion net which are arranged in sequence from the inside to the outside.

[0022] The porous film is close to the stator surface, evenly distributes the flow path of the paint liquid, and prevents local accumulation. The diversion net provides the main structural support force to prevent the flexible porous film from being directly pressed by the flexible vacuum bag, resulting in the sealing of the porous structure. In addition, the porous film prevents the diversion net from being directly pressed against the stator, causing the rigid surface of the diversion net to block the immersion of the paint liquid.

[0023] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0024] 1. The flexible vacuum bag is made of deformable material, replacing the traditional rigid vacuum tank. By wrapping the stator with flexible material, the volume of the equipment and the difficulty of storage are reduced. For the situation where the motor needs to be dip-coated again during maintenance, the requirements for equipment and site can be reduced. The annular accommodation cavity forms a sealed dip-coating space around the stator, which is used for vacuum pumping and pressurization to achieve the penetration of the insulating paint. By the self-forming shape of the flexible vacuum bag, the dip-coating space is limited around the outer contour of the stator, avoiding the flow of the paint liquid to redundant spaces and reducing the total amount of paint liquid required.

[0025] 2. The reserved position of the lead-out hole is aligned with the lead-out wire of the stator winding end. The lead-out hole allows the lead-out wire of the stator winding to pass through the flexible bag, protecting the terminal during the dip-coating process and avoiding the wiring being contaminated by the insulating paint. Since the flexible vacuum bag itself has elasticity, it can achieve self-sealing after the lead-out hole wraps the lead-out wire.

[0026] 3. The sealing film serves as a supplementary protective layer for the flexible vacuum bag, further improving the sealing performance of the flexible vacuum bag and avoiding possible leakage at the mating gaps on the flexible vacuum bag. The sealing film plays a certain restrictive role in the shape of the flexible vacuum bag, preventing the flexible vacuum bag from expanding excessively during the input of the paint liquid, resulting in redundant paint liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments or the prior art of the present drawings, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present drawings. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0028] Figure 1 It is one of the overall structural schematic diagrams of the motor vacuum dip-coating device;

[0029] Figure 2 It is the second overall structural schematic diagram of the motor vacuum dip-coating device.

[0030] In the figure: 1. Flexible vacuum bag; 11. Opening part; 12. Lead-out hole; 2. Accommodating cavity; 3. Fastener; 31. Flange; 4. Functional interface; 5. Diversion layer; 6. Sealing film. Detailed implementation manners

[0031] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be described and illustrated below in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0032] Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, the present application can also be applied to other similar scenarios based on these drawings. In addition, it can also be understood that although the efforts made in this development process may be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present application, some design, manufacturing or production changes made based on the technical content disclosed in the present application are only conventional technical means and should not be understood as the content disclosed in the present application being insufficient.

[0033] However, there will be cases where unnecessary detailed descriptions are omitted. For example, there are cases where detailed descriptions of well-known matters are omitted and repeated descriptions of actually identical structures are omitted. This is to avoid the following descriptions from becoming unnecessarily lengthy and to facilitate the understanding of those skilled in the art. In addition, the accompanying drawings and the following descriptions are provided for those skilled in the art to fully understand the present application and are not intended to limit the subject matter recited in the claims.

[0034] Please refer to Figure 1-2 As shown, in an embodiment of the present utility model, a motor vacuum impregnation device includes a flexible vacuum bag 1, and an annular accommodating cavity 2 is formed inside the flexible vacuum bag 1. The entire motor stator is loaded into the accommodating cavity 2 of the flexible vacuum bag 1, and a sealed impregnation space is formed around the outer contour of the stator by the accommodating cavity 2.

[0035] The flexible vacuum bag 1 is made of a flexible material, which can effectively avoid rigid interference during the assembly process with the motor stator and winding, and has good morphological adaptability. During daily storage, the flexible nature of the flexible vacuum bag 1 allows it to be stored in a collapsed state, significantly reducing the occupied space. Different from traditional vacuum pressure tanks, the lightweight and deformable characteristics of the flexible vacuum bag 1 make the application site requirements of this impregnation device low, and it has good application flexibility during both the initial production process and the secondary maintenance process of the motor.

[0036] In one embodiment, please refer to Figure 1 As shown, the flexible vacuum bag 1 is provided with an opening 11 at one end of the motor stator. The single-end opening 11 is located at one end of the stator, and the stator is inserted into the interior of the flexible vacuum bag 1 through the opening 11. After the stator winding lead wires are concentrated and led out from the stator end, they directly pass through the flexible bag wall near the opening 11 to achieve the directional encapsulation of the cables. An extraction hole 12 is opened near the opening 11 on the flexible vacuum bag 1, and the stator winding lead wires can be led out from the extraction hole 12 to prevent the lead wires from being encapsulated by the paint. This structure has only one opening 11, with fewer mating points where leakage may occur, and is suitable for the dipping process of smaller-sized motor stators.

[0037] In one embodiment, please refer to Figure 2 As shown, the flexible vacuum bag 1 is provided with openings 11 at both ends of the motor stator respectively. The double-end openings 11 are distributed on the two end faces of the stator, and the opening shape matches the annular geometric contour of the stator. After the lead wires are led out from both ends of the stator respectively, they pass through the flexible bag wall near the corresponding openings 11 to achieve a two-way symmetrical layout of the cables. Extraction holes 12 are respectively opened near the two openings 11 on the flexible vacuum bag 1, and the lead wires at both ends of the stator winding are led out from the corresponding extraction holes 12 respectively. This prevents the lead wires from being encapsulated by the paint. After the motor stator enters from one end opening 11, the assembler can debug the position of the motor stator from the other end opening 11, which can improve the assembly convenience and is suitable for the dipping process of larger-sized motor stators.

[0038] The aperture of the extraction hole 12 can be significantly smaller than the outer diameter of the lead wire. The lead wire passes through by the elastic property of the flexible vacuum bag 1 itself, and the self-sealing property of the elastic silicone sleeve is used to wrap the cable.

[0039] The flexible vacuum bag 1 seals the opening 11 through the fastener 3. The opening 11 is adapted to the annular structure of the motor stator. After the opening 11 is closely fitted, there is a circumferential seam, and the fastener 3 squeezes and seals this seam.

[0040] Specifically, the fastener 3 includes two flange plates 31, and the opening 11 is clamped between the two flange plates 31. The two flange plates 31 apply a clamping force perpendicular to the surface of the opening 11 through bolts or quick-release buckles, pressing the edges of the two side walls of the opening 11 between the flange plates 31. The elastic deformation of the flexible material of the flexible vacuum bag 1 fills the microscopic unevenness to form an effective sealing interface.

[0041] In a specific embodiment, one of the flanges 31 and the opening 11 are fixedly engaged on the outer diameter surface of the flexible vacuum bag 1 to form a pre-installation structure. The part of the opening 11 located inside the inner diameter of the flexible vacuum bag 1 extends to the outer diameter part through its ductility or its own shape and fits. Then, the flange 31 in the free state and the flange 31 in the pre-installed state are used to clamp and connect the opening 11. The pre-installed flange 31 provides an initial positioning and reduces the operation difficulty during assembly.

[0042] The functional interface 4 is the connection hub between the flexible vacuum bag 1 and the external system. Through modular design and integrated design with the flexible vacuum bag 1, precise multi-parameter control and process coordination of the impregnation process are achieved. The functional interface 4 includes a vacuum pumping interface, a paint injection / drainage interface, a pressure balance interface, a temperature detection interface, etc. The functional interface 4 uses rigid interfaces such as flanges to cooperate with the flexible vacuum bag 1, facilitating connection with the pipelines of the external system.

[0043] The vacuum pump discharges the gas in the bag volume through the vacuum pumping interface. The paint injection / drainage interface is connected to the paint storage tank and is used to inject or drain the paint liquid into the accommodation cavity 2. The pressure balance interface is opened during the paint drainage process to balance the air pressure inside and outside the accommodation cavity 2. Specifically, the paint injection / drainage interface is arranged at the bottom of the flexible vacuum bag 1, and the paint liquid submerges the stator and the winding in a bottom-to-top form to avoid generating bubbles. When draining the paint, the paint liquid is discharged from the interface by its own gravity. The vacuum pumping interface is arranged at the top of the flexible vacuum bag 1, and the air extraction direction is the same as the paint injection direction to avoid gas-liquid interference. The pressure balance interface is arranged at the top of the flexible vacuum bag 1, and the air intake direction is the same as the paint drainage direction to ensure that air enters smoothly.

[0044] The impregnation device further includes a diversion layer 5, and the diversion layer 5 covers the periphery of the motor stator. On the one hand, the diversion layer 5 provides mechanical support to prevent the flexible vacuum bag 1 from collapsing during the vacuum pumping process and maintain a constant gap between the stator and the bag body. On the other hand, the mesh hole structure of the diversion layer 5 forms a flow channel for the paint liquid, and the paint liquid is evenly distributed from the main channel of the diversion layer 5 to the stator surface by capillary action.

[0045] Specifically, the diversion layer 5 includes a porous membrane and a diversion net arranged in sequence from the inside to the outside. The porous membrane can be a PTFE microporous membrane, which is directly attached to the stator surface, and the paint liquid is evenly distributed to the stator surface by microporous capillary force to avoid local accumulation. The pore size gradient design of the porous membrane (small pore size on the side close to the stator and large pore size on the outside) forms a paint liquid flow resistance gradient, forcing the paint liquid to preferentially penetrate to the deep part. The diversion net is located outside the porous membrane and can be a stainless steel woven net, which is used to resist the collapse of the flexible vacuum bag 1 under vacuum. The mesh of the diversion net forms a high-speed flow channel and does not hinder the inflow of the paint liquid, and cooperates with the porous membrane to form a one-way penetration. The porous membrane can isolate the cured paint layer and avoid the adhesion of the cured paint layer to the diversion net.

[0046] The outer extension parts of the windings at both ends of the stator can also be wrapped with porous membranes. The collapse force of the flexible vacuum bag 1 on this part is small, and it is only necessary to ensure that there is a gap between the winding part and the flexible vacuum bag 1.

[0047] The impregnating device further includes a sealing film 6, which covers the periphery of the flexible vacuum bag 1. The opening 11 of the flexible vacuum bag 1 body is clamped and sealed by a flange 31 to form a primary sealing structure; the sealing film 6 wraps the entire flexible vacuum bag 1, covering potential leakage points such as the bag body joint, the lead-out hole 12, and the edge of the functional interface 4, forming a secondary sealing structure.

[0048] The technological process of the impregnating device of the present utility model is as follows: The porous membrane is attached to the stator surface, and a flow guide net is covered outside the porous membrane. According to the layout of the stator lead-out wires, select the flexible vacuum bag 1 with a single-end or double-end opening 11, place the stator equipped with the flow guide layer 5 into the accommodating cavity 2 of the flexible vacuum bag 1, and align the lead-out wires with the lead-out holes 12 on the bag wall. Use the flange 31 to clamp the edge of the opening 11 and apply bolt pre-tightening force. Connect the functional interface 4 to the external system, where the vacuum pumping interface is connected to the vacuum pump, the paint injection interface is connected to the insulating paint supply unit, and the pressure balance interface is in a closed state. Start the vacuum pump and perform vacuum pumping on the flexible vacuum bag 1 through the vacuum pumping interface to discharge the gas inside the windings. The flexible vacuum bag 1 is externally wrapped with the sealing film 6 and is heat-shrunk and shaped by a hot air gun. Inject insulating paint through the paint injection and discharge interface until the accommodating cavity 2 is filled with the paint liquid. After impregnation, draw out the paint liquid through the paint injection and discharge interface, release the pressure, peel off the sealing film 6, loosen the flange 31, peel off the flow guide layer 5, and finally take out the stator from the flexible vacuum bag 1.

[0049] It should be noted that this application is not limited to the above embodiments. The above embodiments are only examples, and embodiments with the same structure and the same function and effect as the technical idea within the technical solution scope of this application are all included in the technical scope of this application. In addition, within the scope of not departing from the main idea of this application, various deformations that can be thought of by those skilled in the art are applied to the embodiments, and other ways constructed by combining some constituent elements in the embodiments are also included in the scope of this application.

Claims

1. A motor vacuum dipping device, characterized in that: include: A flexible vacuum bag (1) having an annular accommodating cavity (2) formed therein, wherein the flexible vacuum bag (1) is provided with a lead-out hole (12) for the stator winding lead-out wire to pass through; A sealing film (6), wherein the sealing film (6) covers the outer periphery of the flexible vacuum bag (1).

2. The motor vacuum impregnation device according to claim 1, characterized in that: The flexible vacuum bag (1) is provided with an opening (11) at one end of the motor stator.

3. The motor vacuum dipping device according to claim 1, characterized in that: The flexible vacuum bag (1) is provided with openings (11) at both ends of the motor stator.

4. A motor vacuum impregnation device according to claim 2 or 3, characterized in that: It also includes a fastener (3) which is used to seal the opening (11).

5. The motor vacuum impregnation device according to claim 4, characterized in that: The fastener (3) comprises two flanges (31), and the opening (11) is clamped between the two flanges (31).

6. The motor vacuum impregnation device according to claim 1, characterized in that: The flexible vacuum bag (1) is provided with a functional interface (4).

7. The motor vacuum impregnation device according to claim 1, characterized in that: It also comprises a guide layer (5), wherein the guide layer (5) covers the periphery of the motor stator.

8. The motor vacuum impregnation device according to claim 7, characterized in that: The guide layer (5) comprises a porous membrane and a guide net which are arranged in sequence from the inside to the outside.

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