Flexible stator water jacket shrinkage fit tool suitable for medium-frequency induction heating

Abstract

The utility model discloses a flexible stator water jacket shrinkage fit tool suitable for medium-frequency induction heating. The flexible stator water jacket shrinkage fit tool can be compatible with assembly of stator water jackets of various lengths of a platform of a driving motor 220. A medium-frequency induction heater is arranged in the water jacket, and the water jacket is heated through an induction heating process; through the combination of the rhombic positioning pin and the laser positioning device, the water jacket and the stator can be positioned and assembled strictly according to required positions; and a disassembling device is integrated, so that disassembling and reworking are facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of stator assembly, and in particular relates to a flexible stator water jacket heat-shrink tooling suitable for medium-frequency induction heating. Background Art

[0002] The stator and water jacket, which are the core components of the new energy electric drive system, are assembled together through the shrink fitting process. For example, the shrink fitting tooling for assembling the stator of an automobile drive motor disclosed in the patent with the publication number CN218397827U includes a table, on which a limit device and a clamping tooling are arranged; the limit device is used to position the stator positioning tooling or the housing positioning tooling; the clamping tooling is used to clamp and move the stator to the housing for shrink fitting assembly. Improve the standardization and assembly quality of assembly.

[0003] Another example is the shrink fit fixture structure disclosed in the patent with publication number CN220347636U, which is used to realize the shrink fit of the first working piece and the second working piece. The shrink fit fixture structure includes a base and a first limiter, a fixing piece, a second limiter and a third limiter arranged on the base. The first limiter is sleeved on the fixing piece, the second limiter is arranged on the end surface of the fixing piece, and the third limiter is located at the periphery of the first limiter with a gap between the two. The problem of low shrink fit assembly efficiency caused by easy displacement of the first working piece and the second working piece in the prior art is solved.

[0004] The above-mentioned tools are all used for shrink-fit assembly of stators, and focus on solving the positioning problem of stators or housings. In the shrink-fit assembly of stators, in addition to considering the positioning problem, it is also necessary to consider the heating efficiency, the influence of heat dissipation on assembly after the heat source is removed, or whether it is stuck. These are the problems that the above-mentioned tools have not solved and need to be further solved in the shrink-fit assembly of stators. Utility Model Content

[0005] The utility model aims to provide a flexible stator water jacket heat-shrink tooling suitable for medium frequency induction heating, which adopts an induction coil to accelerate the heating efficiency, reduce the heat flow of the heat dissipation part during the heating process, and improve the centering speed of the stator and the water jacket.

[0006] To solve the above problems, the technical solution of the utility model is:

[0007] A flexible stator water jacket heat-shrinking tooling suitable for medium frequency induction heating, comprising: a stand, a bracket, a water jacket, a disassembly and pressing mechanism, a medium frequency induction heater and a laser-assisted positioning device;

[0008] The bracket is sleeved outside the water jacket and placed on the stand; the upper edge of the water jacket is fixed to the bracket;

[0009] The medium frequency induction heater is used to be placed in the water jacket to heat the water jacket, and is taken out after the water jacket is heated;

[0010] The laser-assisted positioning device is installed on the stand, and the height of the laser is greater than the height of the bracket, so as to ensure the position assembly accuracy of the water jacket and the stator during the stator assembly process;

[0011] The disassembly and pressing mechanism is installed on the stand and symmetrically distributed on the outside of the bracket; the pressing block of the disassembly and pressing mechanism is placed above the upper edge of the water jacket, so that when the stator is stuck during assembly, the water jacket is pressed down to facilitate the removal of the stator.

[0012] According to an embodiment of the utility model, the bracket includes an upper frame, a support portion and a lower frame, and the material of the upper frame and the lower frame is consistent with that of the water jacket;

[0013] The upper frame is positioned by a combination of diamond-shaped positioning pins and round pins to fix the upper edge positioning holes of the water jacket;

[0014] The inner diameters of the upper frame and the lower frame are 1 mm to 4 mm away from the outer side of the water jacket, and are compatible with water jackets of different thickness designs.

[0015] According to an embodiment of the utility model, the diamond-shaped positioning pins and the round pins are inserted into the positioning points of the water jacket along the axial direction of the water jacket to reduce positioning errors.

[0016] According to an embodiment of the utility model, a heat-resistant nylon block is arranged between the diamond-shaped positioning pin and the water jacket positioning point to prevent the upper frame from being damaged and reduce the cooling speed of the water jacket during the stator shrink-wrap preparation process.

[0017] According to an embodiment of the utility model, an annular baffle is provided on the side of the bracket to reduce the cooling speed of the water jacket during the stator assembly process.

[0018] According to an embodiment of the utility model, the bottom of the water jacket is suspended to accommodate stators of different lengths and to avoid a temperature drop caused by the bottom of the water jacket hitting the stand after the medium frequency induction heater is removed.

[0019] Due to the adoption of the above technical solution, the utility model has the following advantages and positive effects compared with the prior art:

[0020] The flexible stator water jacket heat-shrink tooling suitable for medium-frequency induction heating in one embodiment of the utility model is compatible with 220 platform motor stators of different lengths through a larger axial space. In terms of improving efficiency, a medium-frequency induction heater is placed in the water jacket, and the electromagnetic action on the workpiece is generated through the induction heating process to generate induced eddy currents. The induced eddy currents do work on the workpiece, converting electrical energy into thermal energy, and the overall efficiency is high. In terms of positioning, the combination of diamond positioning pins and laser positioning devices can ensure that the water jacket and stator are positioned and assembled strictly according to the required position. And an integrated disassembly device is used to facilitate rework. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a flexible stator water jacket heat-shrinking tooling suitable for medium frequency induction heating in one embodiment of the utility model;

[0022] Figure 2 It is a schematic diagram of the heat sleeve configuration in one embodiment of the utility model.

[0023] Description of reference numerals:

[0024] 1: stand; 2: bracket; 201: upper frame; 202: support part; 203: lower frame; 3: water jacket; 4: disassembly and pressing mechanism; 401: handle; 402: connecting rod mechanism; 403: fixing hole; 404: pressing block; 5: diamond locating pin; 6: laser-assisted positioning device; 7: annular baffle; 8: stator. DETAILED DESCRIPTION

[0025] The following is a further detailed description of a flexible stator water jacket heat-shrinking tooling suitable for medium frequency induction heating proposed by the utility model in combination with the accompanying drawings and specific embodiments. The advantages and features of the utility model will become clearer according to the following description and claims.

[0026] When the stator and water jacket are assembled by the shrink-fit process, the water jacket needs to be heated first, and then the stator is put into the water jacket. Usually, the temperature of the water jacket will drop evenly after losing the heat source. However, after contacting the metal (stator), the temperature will drop faster. Therefore, it is necessary to prevent the rapid cooling during the shrink-fit process. In other words, it is necessary to reduce the temperature transfer rate after the stator contacts the water jacket.

[0027] The temperature of the water jacket drops quickly during assembly, which means that if the stator and water jacket are not aligned at the first time, the stator is likely to get stuck after adjustment. Usually it gets stuck at the bottom of the water jacket. Because the bottom is assembled last, it has the longest cooling time and the lowest temperature. Therefore, it is necessary to improve the convenience of the alignment operation.

[0028] Based on the above situation, this embodiment provides a flexible stator water jacket shrink fitting suitable for medium frequency induction heating, which can improve heating efficiency, reduce heat flow of the heat dissipation part during heating, and increase the centering speed of the stator and the water jacket.

[0029] Please see Figure 1 , Figure 2 , the tooling includes: a stand 1, a bracket 2, a water jacket 3, a disassembly and pressing mechanism 4, a medium frequency induction heater and a laser-assisted positioning device 6. Among them, the bracket 2 is sleeved outside the water jacket 3 and placed on the stand 1; the upper edge of the water jacket 3 is fixed to the bracket 2. The medium frequency induction heater is used to be placed in the water jacket 3 to heat the water jacket, and is taken out after the water jacket 3 is heated, so as to create a thermal environment for the assembly of the stator 8 and the water jacket 3. The laser-assisted positioning device 6 is installed on the stand 1, and the height of the laser is greater than the height of the bracket 2, so as to ensure the position assembly accuracy of the water jacket and the stator during the stator assembly process. The disassembly and pressing mechanism 4 is installed on the stand 1 and is symmetrically distributed on the outside of the bracket 2, that is, there are two disassembly and pressing mechanisms symmetrically about the center of the bracket. The pressing block of the disassembly and pressing mechanism 4 is placed above the upper edge of the water jacket, so that when the stator is stuck during the assembly process, the water jacket is pressed down and fixed, so as to facilitate the removal of the stator.

[0030] Specifically, the tooling is suitable for stators with a length of 150mm to 350mm, covering the conventional stator length sizes in the high, medium and low power ranges. The medium frequency induction heating equipment with an oscillation frequency of 3kHz to 15kHz can be used for stator water jacket shrink-fit assembly.

[0031] The bracket 2 includes an upper frame 201, a support portion 202 and a lower frame 203, and the material of the upper frame 201 and the lower frame 203 is consistent with that of the water jacket 3. The upper frame 201 uses a diamond positioning pin 5 and a round pin to fix the upper edge of the water jacket 3, and the diamond positioning pin 5 and the round pin are inserted into the positioning point of the water jacket along the axial direction of the water jacket 3. It can be understood that the upper edge of the water jacket extends outward to form a water jacket positioning ring, and a number of positioning points are opened on the water jacket positioning ring. The water jacket positioning ring is placed on the upper frame 201, and the diamond positioning pin 5 and the round pin are vertically inserted into the positioning point to fix the water jacket 3.

[0032] The upper frame 201 and the lower frame 203 are made of aluminum alloy similar to the material of the water jacket 3, and the support part 202 is made of quenched and tempered steel. When heating, the upper and lower aluminum frames of the tooling use diamond-shaped positioning pins to fix the water jacket on the outside, and the gap between the inner diameter of the frame and the outer edge of the water jacket is between 1mm and 4mm to improve the heat effect during heating. The quenched and tempered steel of the support part 202 is away from the water jacket 3 to reduce the influence of eddy current intensity. The medium-frequency induction heater can be an induction coil. The water jacket 3 is heated from the inside by an induction coil. When heating, the induction coil is placed in the water jacket, and the aluminum alloy frame used for positioning is affected by the thermal expansion of the material, which is consistent with the expansion of the water jacket. The water jacket positioning point and the water jacket expand outward synchronously to reduce the initial reserved thermal expansion gap, thereby improving the positioning accuracy. The positioning pin uses a diamond pin in the radial direction to reduce over-positioning errors. Taking into account the disadvantage that aluminum alloy frames are easily damaged by knocks, heat-resistant nylon blocks are added to the positioning surface. Heat-resistant nylon blocks are also set between the diamond positioning pins and the water jacket positioning points to prevent the tooling from being damaged during use. At the same time, heat-resistant nylon can ensure that the high temperature during induction heating will not affect or damage the tooling.

[0033] An annular baffle 7 is provided on the side of the bracket 2 to effectively utilize the heating energy of the induction heating periphery. The tooling heating speed can be changed by adjusting the radial thickness of the baffle. In addition, the baffle can slightly reduce the cooling speed of the middle part of the water jacket during assembly by reducing the heat radiation loss of the water jacket and reducing the air flow near the water jacket under ventilation conditions, so as to reduce the cooling speed of the water jacket during the stator assembly process.

[0034] In terms of slowing down the temperature drop, this embodiment also has a heat insulation design at the bottom of the tooling. Specifically, the bottom of the water jacket 3 is suspended to prevent the bottom of the water jacket from hitting the stand after the medium frequency induction heater is removed, causing the temperature to drop. Because the bottom is the last part of the stator to contact the water jacket, it has the lowest temperature and is also the key factor for stagnation. This heat insulation design can prevent stator stagnation to a certain extent.

[0035] In terms of positioning, this embodiment adopts a laser-assisted positioning device 6 fixed on the stand 1, and the circumferential installation position of the laser-assisted positioning device is determined according to the product design to ensure that the three-phase outlet terminal of the stator is at a fixed circumferential angle in the waterway. During the assembly of the stator, the vertical laser beam is manually aligned with the through groove on the outside of the stator to determine the circumferential centering. The laser height is about 10 cm from the surface of the upper frame 201, and can illuminate the upper frame surface and the side of the stator at the same time, and also avoid irradiating the operator's eyes. Laser positioning is convenient for model change, and compared with the traditional limiting method using elastic pins or positioning pins, when the stator falls, there is no radial force of the elastic pin in the conventional design, and laser centering is used instead, which makes it easier to keep the stator in a vertical state. As a flexible operating tool, it assists operators in assembly.

[0036] The tooling also integrates a disassembly and pressing mechanism 4, which is used to press down the water jacket when the stator is stuck during assembly, so as to facilitate the removal of the stator. The disassembly and pressing mechanism 4 is fixed by a connecting rod mechanism and bolts. When disassembling, the connecting rod mechanism 402 is rotated around the fixing hole 403 by the handle 401. When the pressing block 404 is pressed into place (i.e. Figure 1 The bolts of the fixing holes 403 are tightened to fix the handle, thereby fixing the axial position of the water jacket, and the stator can be pulled out. That is to say, when the stator is normally shrunk, the pressing block 404 of the disassembled pressing mechanism 4 is far away from the upper edge of the water jacket 3. When it is stuck, the pressing block 404 can be brought to the upper edge of the water jacket 3 by rotating the connecting rod mechanism 402 to be pressed and fixed.

[0037] In summary, the flexible stator water jacket shrink-fit tooling suitable for medium-frequency induction heating is suitable for flexible assembly, can match stators of different lengths, and covers multiple power ranges; the water jacket has little heat loss during shrink-fit assembly, so there is more time for centering; the diamond pins combined with the laser positioning device can ensure that the water jacket and the stator are assembled according to the required positions; and when the stator falls, since there is no radial force of the elastic pins in the conventional design, laser centering is used instead, which makes it easier to keep the stator in a vertical state and more convenient to operate; in addition, when the shrink-fit is stuck, the water jacket can be fixed by disassembling the pressing mechanism, the stator can be quickly pulled out, and the shrink-fit can be reworked.

[0038] The above is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A flexible stator water jacket heat-shrink tooling suitable for medium frequency induction heating, characterized in that: include: Bench, bracket, water jacket, disassembly and pressing mechanism, medium frequency induction heater and laser-assisted positioning device; The bracket is sleeved outside the water jacket and placed on the stand; the upper edge of the water jacket is fixed to the bracket; The medium frequency induction heater is used to be placed in the water jacket to heat the water jacket, and is taken out after the water jacket is heated; The laser-assisted positioning device is installed on the stand, and the height of the laser is greater than the height of the bracket, so as to ensure the position assembly accuracy of the water jacket and the stator during the stator assembly process; The disassembly and pressing mechanism is installed on the stand and symmetrically distributed on the outside of the bracket; the pressing block of the disassembly and pressing mechanism is placed above the upper edge of the water jacket, so that when the stator is stuck during assembly, the water jacket can be pressed down and fixed to facilitate the removal of the stator.

2. The flexible stator water jacket heat shrink fitting suitable for medium frequency induction heating according to claim 1, characterized in that: The bracket includes an upper frame, a support portion and a lower frame, and the material of the upper frame and the lower frame is consistent with that of the water jacket; The upper frame is positioned by a combination of diamond-shaped positioning pins and round pins to fix the upper edge positioning holes of the water jacket; The inner diameters of the upper frame and the lower frame are 1 mm to 4 mm away from the outer side of the water jacket, and are compatible with water jackets of different thickness designs.

3. The flexible stator water jacket heat shrink fitting suitable for medium frequency induction heating according to claim 2, characterized in that: The diamond-shaped positioning pins and the round pins are inserted into the positioning points of the water jacket along the axial direction of the water jacket to reduce positioning errors.

4. The flexible stator water jacket heat-shrink fitting suitable for medium frequency induction heating according to claim 2, characterized in that: A heat-resistant nylon block is arranged between the diamond-shaped positioning pin and the water jacket positioning point to prevent the upper frame from being damaged and reduce the cooling speed of the water jacket during the stator shrink-wrapping preparation process.

5. The flexible stator water jacket heat shrink fitting suitable for medium frequency induction heating according to claim 2, characterized in that: An annular baffle is arranged on the side of the bracket to reduce the cooling speed of the water jacket during the stator assembly process.

6. The flexible stator water jacket heat shrink fitting suitable for medium frequency induction heating according to claim 1, characterized in that: The bottom of the water jacket is suspended to accommodate stators of different lengths and to prevent the bottom of the water jacket from hitting the stand and causing a drop in temperature after the medium frequency induction heater is removed.

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