Stator potting tool suitable for high slot fullness rate

Abstract

The utility model relates to the technical field of motor stator potting, and discloses a stator potting tool suitable for a high slot fullness rate, a stator assembly is pressed in a die pressing assembly, and an expansion core rod passes through an inner hole of the stator assembly through the die pressing assembly; the mold pressing assembly is provided with a glue inlet and a glue outlet overflow port, a plurality of stator coils are spirally wound on the inner wall of an inner hole of the stator assembly, the adjacent coils are arranged in a clearance mode, the clearance is a glue flowing channel, the glue inlet is communicated with the glue outlet overflow port through the glue flowing channel, and epoxy resin glue is injected through the glue inlet. The epoxy resin glue sequentially flows out of the glue overflow port through the glue circulation channel and is stored in the material storage cup, the glue in the material storage cup is released from vacuum to atmospheric pressure after encapsulation is completed, the pressure can act on the glue in the material storage cup, the glue is pressed into a stator assembly coil, encapsulation is more compact, meanwhile, the glue shrinks to a certain extent when cured, and therefore the glue is not prone to falling off. And the resin in the material storage cup supplements the contracted space in time, so that the filling and sealing effect is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of motor stator potting, in particular to a stator potting tooling applicable to a high slot fill factor. Background Technique

[0002] At present, the potting methods of motor stators are generally divided into two types. One is potting with a casing, and the other is potting of a single stator assembly. For stators with a low slot fill factor, whether with or without a casing, potting is carried out from the top of the casting under vacuum. The resin material flows through the gaps of the coils under the action of gravity. After potting is completed, when the potting chamber is vented to atmospheric pressure, the air pressure will generate a certain pressure on the potting material, making the potting material denser and filling more fully.

[0003] However, for stator assemblies with a high slot fill factor, the gaps between the coils are very small. Using the above potting method, it is found that the epoxy resin glue cannot be fully filled in the coils, resulting in holes and air holes in the middle of the coils. During use, when the coils heat up, the gas in the holes and air holes expands, which will cause the potting resin to crack and the stator to be scrapped. Content of the Utility Model

[0004] In order to overcome the defects existing in the above-mentioned prior art, the purpose of the utility model is to provide a stator potting tooling applicable to a high slot fill factor to solve the technical problem of improving the filling effect of epoxy resin glue in existing stator assemblies with a high slot fill factor in the prior art.

[0005] The utility model is realized through the following technical solutions:

[0006] A stator potting tooling applicable to a high slot fill factor includes a forming and pressing assembly, a stator assembly, and an expansion mandrel;

[0007] The stator assembly is pressed and installed in the forming and pressing assembly. The stator assembly is provided with an inner hole, and the expansion mandrel passes through the forming and pressing assembly and extends into the inner hole of the stator assembly;

[0008] The forming and pressing assembly is provided with a glue inlet and a glue outlet overflow port. A plurality of stator coils are spirally arranged on the inner wall of the inner hole of the stator assembly, and gaps are provided between adjacent coils. The gaps are glue flow channels, and the glue inlet is communicated with the glue outlet overflow port through the glue flow channels; a storage cup is provided at the glue outlet overflow port.

[0009] Preferably, the forming and pressing assembly includes an upper forming and pressing cover and a lower forming and pressing cover; the upper forming and pressing cover is pressed on the top of the stator assembly, and the lower forming and pressing cover is pressed on the bottom of the stator assembly;

[0010] The glue inlet is arranged on the lower forming and pressing cover, and the glue outlet overflow port is arranged on the upper forming and pressing cover;

[0011] The upper forming mold pressing cover and the lower forming mold pressing cover are respectively provided with communication holes corresponding to the inner hole of the stator assembly. The expansion mandrel sequentially penetrates through the communication holes of the upper forming mold pressing cover, the stator assembly, and the lower forming mold pressing cover, and is fixedly connected to the lower forming mold pressing cover.

[0012] Furthermore, sealing gaskets are respectively provided between the upper forming mold pressing cover and the top of the stator assembly, and between the lower forming mold pressing cover and the stator assembly.

[0013] Furthermore, the communication holes of the upper forming mold pressing cover and the lower forming mold pressing cover are coaxially arranged with the inner hole of the stator assembly and have equal inner diameters.

[0014] Even further, the outer diameter of the expansion mandrel is correspondingly arranged with the aperture diameters of the communication holes of the upper forming mold pressing cover and the lower forming mold pressing cover and the inner hole of the stator assembly.

[0015] Furthermore, the length of the expansion mandrel is greater than the assembly height of the upper forming mold pressing cover, the stator assembly, and the lower forming mold pressing cover.

[0016] Furthermore, the opening direction of the feed port is horizontal, and the opening direction of the discharge port is vertical.

[0017] Preferably, the inner wall of the material storage cup is of a funnel structure, wherein the port diameter of the input end of the material storage cup is larger than the port diameter of the output end. The output end of the material storage cup is communicated with the port of the discharge port, and a sealing gasket is provided at the communication position.

[0018] Preferably, the glue inlet and the glue overflow outlet are distributed on both sides of the stator assembly on the mold pressing assembly at 180°.

[0019] Furthermore, a silica gel sleeve is filled in the glue inlet for plugging the glue inlet.

[0020] Compared with the prior art, the present utility model has the following beneficial technical effects:

[0021] The present utility model provides a stator potting tooling suitable for a high slot fill factor. The stator assembly is press-fitted into the forming mold pressing assembly, and the expansion mandrel penetrates through the mold pressing assembly to the inner hole of the stator assembly. The mold pressing assembly is provided with a glue inlet and a glue overflow outlet. The inner hole inner wall of the stator assembly is spirally provided with a plurality of stator coils, and a gap is provided between adjacent coils, and the gap is a glue flow channel. The glue inlet is communicated with the glue overflow outlet through the glue flow channel. Oxygen resin glue is injected through the glue inlet, and the oxygen resin glue sequentially flows out of the glue overflow outlet through the glue flow channel and is stored in the material storage cup. On the one hand, after the potting is completed, the pressure will act on the glue in the material storage cup when the pressure is released from vacuum to atmospheric pressure, pressing the glue into the stator assembly coils, making the potting tighter. On the other hand, when the glue cures, there will be a certain shrinkage, and the resin in the material storage cup will timely supplement the shrunk space to ensure the potting effect.

[0022] Furthermore, the molding and pressing assembly includes an upper molding and pressing cover and a lower molding and pressing cover; the upper molding and pressing cover is press-fitted on the top of the stator assembly, and the lower molding and pressing cover is press-fitted on the bottom of the stator assembly, greatly improving the press-fitting efficiency of the stator assembly. The glue inlet is arranged on the lower molding and pressing cover, and the glue outlet overflow port is arranged on the upper molding and pressing cover; this makes the length of the glue flow channel longer, and the farther the path, the greater the pressure of the glue flowing through. When the glue flows out from the glue outlet overflow port, it proves that the remaining space of the stator assembly has been filled. The upper molding and pressing cover and the lower molding and pressing cover are respectively provided with communication holes corresponding to the inner hole of the stator assembly. The expansion mandrel sequentially penetrates through the communication holes of the upper molding and pressing cover, the stator assembly, and the lower molding and pressing cover, and is fixedly connected to the lower molding and pressing cover, providing a radial pressing force to the stator assembly and improving the glue pouring and curing effect.

[0023] Furthermore, sealing gaskets are respectively arranged between the upper molding and pressing cover and the top of the stator assembly and between the lower molding and pressing cover and the stator assembly, improving the sealing performance between the upper molding and pressing cover and the stator assembly and between the lower molding and pressing cover and the stator assembly.

[0024] Furthermore, the communication holes of the upper molding and pressing cover and the lower molding and pressing cover are coaxially arranged with the inner hole of the stator assembly and have the same inner diameter. The outer diameter of the expansion mandrel corresponds to the aperture of the communication holes of the upper molding and pressing cover and the lower molding and pressing cover and the inner hole of the stator assembly, pressing the glue into the stator assembly coil to make the potting more compact.

[0025] Furthermore, the opening direction of the feed port is horizontal, and the opening direction of the discharge port is vertical, facilitating the horizontal injection of glue from the feed port and allowing the glue to timely supplement the contracted space by its own gravity in the discharge port, ensuring the potting effect.

[0026] Furthermore, the inner wall of the glue storage cup is of a funnel structure, where the port diameter of the input end of the glue storage cup is larger than that of the output end. The output end of the glue storage cup is communicated with the port of the discharge port, and a sealing gasket is arranged at the communication position. The funnel-shaped design ensures that the contact surface between the glue and the air is large enough, and the pressure generated by the atmospheric pressure is large enough to ensure that the glue can completely fill the stator assembly.

[0027] Furthermore, the glue inlet and the glue outlet overflow port are distributed on both sides of the stator assembly on the molding and pressing assembly at an angle of °. Based on the fact that the farther the path, the greater the pressure of the glue flowing through, when the glue flows out from the glue outlet overflow port, it proves that the remaining space of the stator assembly has been filled.

[0028] Furthermore, a silica gel sleeve is filled in the glue inlet for plugging the glue inlet, improving the sealing performance of the glue inlet to prevent glue leakage. Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of the stator potting tooling in the present utility model;

[0030] Figure 2 This is a schematic structural view of the lower forming die pressing cover in the present utility model;

[0031] Figure 3 This is a schematic structural view of the upper forming die pressing cover in the present utility model;

[0032] Figure 4 This is a schematic structural view of the stock cup in the present utility model;

[0033] In the figure: 1 - upper forming die pressing cover; 2 - stator assembly; 3 - expansion mandrel; 4 - lower forming die pressing cover; 5 - silica gel sleeve; 6 - stock cup; 7 - glue inlet; 8 - glue outlet overflow port. Specific embodiments

[0034] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0035] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned accompanying drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described here can be implemented in an order different from those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily need to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0036] The following further describes the present utility model in detail with reference to the accompanying drawings:

[0037] The purpose of the present utility model is to provide a stator potting tooling applicable to a high slot fill factor to solve the technical problem of improving the filling effect of epoxy resin glue for existing stator assemblies with a high slot fill factor in the prior art.

[0038] Embodiment 1

[0039] See Figure 1, in an embodiment of the present utility model, a stator potting tooling applicable to a high slot fill factor is provided, including a forming and pressing assembly, a stator assembly 2, and an expansion mandrel 3;

[0040] The stator assembly 2 is press-fitted into the forming and pressing assembly. The stator assembly 2 is provided with an inner hole, and the expansion mandrel 3 passes through the forming and pressing assembly and extends into the inner hole of the stator assembly 2;

[0041] The forming and pressing assembly is provided with a glue inlet 7 and a glue outlet overflow port 8. A plurality of stator coils are spirally arranged on the inner wall of the inner hole of the stator assembly 2, and there is a gap between adjacent coils. The gap is a glue flow channel, and the glue inlet 7 is communicated with the glue outlet overflow port 8 through the glue flow channel; A storage cup 6 is provided at the glue outlet overflow port 8.

[0042] Specifically, the forming and pressing assembly includes an upper forming and pressing cover 1 and a lower forming and pressing cover 4; The upper forming and pressing cover 1 is press-fitted on the top of the stator assembly 2, and the lower forming and pressing cover 4 is press-fitted on the bottom of the stator assembly 2, as Figure 2 and Figure 3 shown;

[0043] The glue inlet 7 is arranged on the lower forming and pressing cover 4, and the glue outlet overflow port 8 is arranged on the upper forming and pressing cover 1;

[0044] The upper forming and pressing cover 1 and the lower forming and pressing cover 4 are respectively provided with communication holes corresponding to the inner hole of the stator assembly 2. The expansion mandrel 3 sequentially passes through the communication holes of the upper forming and pressing cover 1, the stator assembly 2, and the lower forming and pressing cover 4, and is fixedly connected to the lower forming and pressing cover 4.

[0045] Among them, sealing gaskets are respectively arranged between the upper forming and pressing cover 1 and the top of the stator assembly 2, and between the lower forming and pressing cover 4 and the stator assembly 2, improving the sealing performance between the upper forming and pressing cover 1 and the stator assembly 2, and between the lower forming and pressing cover 3 and the stator assembly 2.

[0046] Among them, the communication holes of the upper forming and pressing cover 1 and the lower forming and pressing cover 4 are coaxially arranged with the inner hole of the stator assembly 2 and have equal inner diameters.

[0047] Specifically, the outer diameter of the expansion mandrel 3 corresponds to the pore diameters of the communication holes of the upper forming and pressing cover 1 and the lower forming and pressing cover 4 and the inner hole of the stator assembly 2.

[0048] Specifically, the length of the expansion mandrel 3 is greater than the assembly height of the upper forming and pressing cover 1, the stator assembly 2, and the lower forming and pressing cover 4.

[0049] Specifically, the opening direction of the feed port 7 is horizontal, and the opening direction of the discharge port 8 is vertical, facilitating the horizontal injection of glue from the feed port and ensuring that the space after shrinkage is timely replenished by its own gravity in the discharge port, ensuring the potting effect.

[0050] In this embodiment, the glue inlet 7 is arranged on the lower forming mold pressing cover 4, and the glue overflow outlet 8 is arranged on the upper forming mold pressing cover 1; this makes the length of the glue flow channel longer. The farther the path is, the greater the pressure of the glue flowing through. When the glue flows out from the glue overflow outlet, it proves that the rest of the space of the stator assembly has been filled.

[0051] Embodiment 2

[0052] See Figure 1 , in an embodiment of the present utility model, a stator potting tooling applicable to a high slot fill factor is provided, including a forming and pressing assembly, a stator assembly 2 and an expansion mandrel 3;

[0053] The stator assembly 2 is press-fitted into the forming and pressing assembly. The stator assembly 2 is provided with an inner hole, and the expansion mandrel 3 passes through the forming and pressing assembly and penetrates into the inner hole of the stator assembly 2;

[0054] The forming and pressing assembly is provided with a glue inlet 7 and a glue overflow outlet 8. A plurality of stator coils are spirally arranged on the inner wall of the inner hole of the stator assembly 2, and gaps are provided between adjacent coils. The gaps are glue flow channels, and the glue inlet 7 is communicated with the glue overflow outlet 8 through the glue flow channels; a storage cup 6 is provided at the glue overflow outlet 8.

[0055] Specifically, as shown in Figure 4 , the inner wall of the storage cup 6 is of a funnel structure, wherein the port diameter of the input end of the storage cup 6 is larger than the port diameter of the output end. The output end of the storage cup 6 is communicated with the port of the discharge port 8, and a gasket is provided at the communicating part.

[0056] Specifically, the glue inlet 7 and the glue overflow outlet 8 are distributed on both sides of the stator assembly 2 on the forming and pressing assembly at 180°.

[0057] Specifically, a silica gel sleeve 5 is filled in the glue inlet 7 for plugging the glue inlet 7.

[0058] In this embodiment, when potting, when it is full, some more materials will be appropriately poured into the storage cup 6. On the one hand, after potting is completed and the vacuum is released to atmospheric pressure, the pressure will act on the glue in the storage cup, pressing the glue into the stator assembly coils, making the potting tighter. On the other hand, when the glue cures, there will be a certain amount of shrinkage, and the resin in the storage cup will timely supplement the space after shrinkage to ensure the potting effect. The funnel-shaped design of the storage cup 6 ensures that the contact surface between the glue and the air is large enough, and the pressure generated after the action of atmospheric pressure is large enough to ensure that the glue can completely fill the stator assembly. The storage cup 6 is made of polytetrafluoroethylene material, which can ensure that the remaining cured resin material can be easily demolded.

[0059] The working principle of the stator potting tooling applicable to a high slot fill factor provided by the present utility model is as follows:

[0060] Connect the transition hose to the glue inlet 7. Under the pressure of the metering pump, the glue flows into the stator coil. Due to the relatively high pressure of the metering pump, even for a stator assembly with a high slot fill rate, the glue can fill the internal gap of the coil. The upper molded cover 1 is designed with a glue overflow port 8. On the one hand, before the potting operation, the stator assembly 2 needs to be evacuated through the glue overflow port 8 to remove moisture and excess air in the stator assembly, so that the inside of the stator assembly 2 is in a vacuum state. On the other hand, when pouring glue during potting, when the glue flows out of the glue overflow port 8, it can be determined that the glue has filled the entire stator assembly 2. As Figure 1 shown, the glue inlet and the glue overflow port are arranged at 180°. This design is mainly based on the fact that the farther the path, the greater the pressure of the glue flow. When the glue flows out of the glue overflow port, it proves that the remaining space of the stator assembly has been filled. Since the glue will shrink during the curing process, when pouring is full during potting, some additional material will be appropriately poured into the storage cup 6. On the one hand, after the potting is completed, when the vacuum is released to atmospheric pressure, the pressure will act on the glue in the storage cup, pressing the glue into the stator assembly coil, making the potting tighter. On the other hand, when the glue cures, there will be a certain amount of shrinkage, and the resin in the storage cup will timely supplement the space after shrinkage to ensure the potting effect.

[0061] In the present utility model, by using the pressure of the metering pump to inject glue from below the stator assembly, it can meet the stator assembly with a high slot fill rate. The design of the storage cup 6 can timely supplement the gap shrunk during the glue curing. In addition, after the potting is completed, when the stator assembly 2 is released from vacuum to atmospheric pressure, the pressure acts on the glue, making the filling of the stator assembly 2 more substantial. The storage cup 6 is designed in a funnel form, which can increase the acting surface of the pressure to generate a sufficient large pressure.

[0062] In summary, the present utility model provides a stator potting tooling suitable for a high slot fill rate. By pressing the stator assembly into the molded pressing assembly and passing the expansion mandrel through the molded pressing assembly into the inner hole of the stator assembly; the molded pressing assembly is provided with a glue inlet and a glue overflow port. The inner wall of the inner hole of the stator assembly is spirally provided with several stator coils, and gaps are provided between adjacent coils, and the gaps are glue flow channels. The glue inlet is communicated with the glue overflow port through the glue flow channel. Oxygen resin glue is injected through the glue inlet, and the oxygen resin glue flows out of the glue overflow port through the glue flow channel in turn and is stored in the storage cup. On the one hand, after the potting is completed, when the vacuum is released to atmospheric pressure, the pressure will act on the glue in the storage cup, pressing the glue into the stator assembly coil, making the potting tighter. On the other hand, when the glue cures, there will be a certain amount of shrinkage, and the resin in the storage cup will timely supplement the space after shrinkage to ensure the potting effect.

[0063] In the present utility model, a method of pressure injecting glue from below the stator assembly is adopted. Under the action of pressure, the epoxy resin glue can completely fill the stator coil to achieve the purpose of eliminating holes.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent substitutions can still be made to the specific implementation manners of the present invention, and any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A stator potting tool suitable for high slot filling rate, characterized in that: It comprises a molded assembly, a stator assembly (2) and an expansion mandrel (3); The stator assembly (2) is press-fitted into a molded assembly, the stator assembly (2) is provided with an inner hole, and the expansion core rod (3) passes through the molded assembly and penetrates into the inner hole of the stator assembly (2); The molded assembly is provided with a glue inlet (7) and a glue overflow port (8); a plurality of stator coils are arranged on the inner wall of the inner hole of the stator assembly (2) and a gap is arranged between adjacent coils, the gap being a glue circulation channel; the glue inlet (7) is connected to the glue overflow port (8) through the glue circulation channel; and a material storage cup (6) is arranged at the glue overflow port (8).

2. The stator potting tooling suitable for high slot filling rate according to claim 1, characterized in that: The molded assembly comprises an upper molded cover (1) and a lower molded cover (4); the upper molded cover (1) is pressed onto the top of the stator assembly (2), and the lower molded cover (4) is pressed onto the bottom of the stator assembly (2); The glue inlet (7) is arranged on the lower mold pressing cover (4), and the glue outlet overflow port (8) is arranged on the upper mold pressing cover (1); The upper molded cover (1) and the lower molded cover (4) are respectively provided with connecting holes corresponding to the inner holes of the stator assembly (2); the expansion core rod (3) sequentially passes through the connecting holes of the upper molded cover (1), the stator assembly (2) and the lower molded cover (4), and is fixedly connected to the lower molded cover (4).

3. The stator potting tooling suitable for high slot filling rate according to claim 2, characterized in that: Sealing gaskets are provided between the upper molded cover (1) and the top of the stator assembly (2), and between the lower molded cover (4) and the stator assembly (2), respectively.

4. The stator potting tooling suitable for high slot filling rate according to claim 2, characterized in that: The communicating holes of the upper molded cover (1) and the lower molded cover (4) are coaxially arranged with the inner hole of the stator assembly (2) and have the same inner diameter.

5. The stator potting tooling suitable for high slot filling rate according to claim 4, characterized in that: The outer diameter of the expansion core rod (3) is set corresponding to the diameter of the connecting holes of the upper molded cover (1) and the lower molded cover (4) and the inner hole of the stator assembly (2).

6. The stator potting tooling suitable for high slot filling rate according to claim 2, characterized in that: The length of the expansion core rod (3) is greater than the assembly height of the upper molded cover (1), the stator assembly (2) and the lower molded cover (4).

7. The stator potting tooling suitable for high slot filling rate according to claim 2, characterized in that: The opening direction of the glue inlet (7) is a horizontal direction, and the opening direction of the glue outlet overflow port (8) is a vertical direction.

8. The stator potting tooling suitable for high slot filling rate according to claim 1, characterized in that: The inner wall of the material storage cup (6) is a funnel structure, wherein the port diameter of the input end of the material storage cup (6) is larger than the port diameter of the output end, the output end of the material storage cup (6) is connected to the port of the glue overflow port (8), and a sealing gasket is provided at the connection point.

9. The stator potting tooling suitable for high slot filling rate according to claim 1, characterized in that: The glue inlet (7) and the glue outlet overflow port (8) are distributed on both sides of the stator assembly (2) at an angle of 180 degrees on the molded assembly.

10. The stator potting tooling suitable for high slot filling rate according to claim 9, characterized in that: The glue inlet (7) is filled with a silicone sleeve (5) to plug the glue inlet (7).

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