A motor stator potting device

Abstract

The present invention discloses a motor stator potting device, which belongs to the field of motor production technology, and comprises an inner cylinder, which is hollow and has a plurality of liquid injection grooves on the circumferential side of the inner cylinder; a lifting column is arranged in the inner cylinder, and when the lifting column moves upward along the axial direction of the inner cylinder, the liquid injection grooves are gradually closed from bottom to top; a lower mold, which is fixed on the outer wall of the lower end of the inner cylinder; and an upper mold is sleeved on the outer wall of the upper end of the inner cylinder. The inner cylinder provided by the present invention is provided with a liquid injection groove corresponding to the semi-closed groove, and the lifting column is slidably installed in the inner cylinder, and when the lifting column moves upward along the inner cylinder, the sealing strip on the lifting column can gradually block the liquid injection groove from bottom to top, and the potting glue can be injected into the inner cylinder, and flow from the top of the lifting column to the liquid injection groove and enter the semi-closed groove, so as to realize the potting of the stator core from bottom to top and from inside to outside, and fully discharge the air in the gap of the coil winding, and reduce or avoid the occurrence of hollow drums.

Description

Technical Field

[0001] The present invention relates to the technical field of motor production, and in particular to a motor stator potting device. Background Art

[0002] The motor stator is a crucial component, and the quality of its coil windings significantly impacts the motor's performance. Water ingress into the coil windings can directly damage the motor. To improve motor stability and durability, some companies are sealing the motor casing to isolate the stator from the outside world. Others, in addition to sealing the motor casing, further potting the stator windings to enhance their durability.

[0003] The existing potting method is to pour the potting compound into the semi-closed slot from the top of the stator winding. The potting compound flows from top to bottom into the gap of the coil winding, which is prone to bubbles and hollows, resulting in poor potting quality. Summary of the Invention

[0004] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a motor stator potting device, which, by providing an inner cylinder and a lifting column, can gradually pour potting glue from the inner side of the stator core from bottom to top, thereby reducing or avoiding the occurrence of hollowing.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: The present invention provides a motor stator potting device, comprising:

[0006] An inner cylinder, wherein the inner cylinder is hollow and has a plurality of long strip-shaped liquid injection grooves on the circumferential side thereof corresponding one-to-one to the semi-closed grooves on the stator;

[0007] A lifting column is provided in the inner cylinder, and when the lifting column moves upward along the axial direction of the inner cylinder, the liquid injection groove is gradually closed from bottom to top;

[0008] A lower die is fixed to the outer wall of the lower end of the inner cylinder, a positioning groove is provided on the lower die to match the bottom of the stator core, and a first making way cavity is provided on the lower die to make way for the coil winding;

[0009] An upper die is sleeved on the outer wall of the upper end of the inner cylinder, and a positioning groove is provided on the upper die to match the upper part of the stator core. A second clearance cavity is provided on the upper die to make room for the coil winding and the lead wire;

[0010] The potting glue flows from the top of the lifting column to the multiple injection grooves and is injected into the multiple semi-closed grooves at the same time.

[0011] Preferably, the end of the injection groove away from the upper mold passes through the bottom end of the inner cylinder, and a plurality of sealing strips corresponding to the injection grooves are fixed on the circumferential side wall of the lifting column, and the sealing strips are slidably matched with the injection grooves.

[0012] Preferably, the top of the lifting column is fixedly connected to a liquid injection unit through a plurality of connecting columns. The liquid injection unit includes a liquid storage tube and a flow limiting portion fixed to the bottom of the liquid storage tube. The flow channel in the liquid storage tube passes through the flow limiting portion.

[0013] Preferably, the flow channel is in an inverted cone shape, and a filter is provided at the lower end of the flow channel.

[0014] Preferably, a guide cone is provided on the top of the lifting column, and the top of the guide cone is located directly below the filter screen.

[0015] Preferably, a plurality of sealing strips that slide in cooperation with the liquid injection grooves are fixed on the flow limiting portion.

[0016] Preferably, the top outer wall of the flow limiting portion is in an inverted cone shape.

[0017] Preferably, the outer wall of the inner cylinder is provided with positioning ridges corresponding to the semi-closed slots of the stator.

[0018] Preferably, a threaded sleeve is fixed on the lower die through a bracket, a screw rod is rotatably installed on the lifting column, and the screw rod is threadably matched with the threaded sleeve.

[0019] Preferably, sealing rings are provided in the positioning grooves of the upper mold and the lower mold.

[0020] The beneficial effects of the present invention are:

[0021] The inner cylinder provided in the present invention is provided with a liquid injection groove corresponding to the semi-closed groove, and a lifting column is slidably installed in the inner cylinder. When the lifting column moves upward along the inner cylinder, the sealing strip on the lifting column can gradually block the liquid injection groove from bottom to top, and the potting glue can be injected into the inner cylinder, flowing from the top of the lifting column to the liquid injection groove and into the semi-closed groove, thereby realizing potting of the stator core from bottom to top and from inside to outside, fully discharging the air in the coil winding gap, reducing or avoiding the occurrence of hollowing, and the sealing strip can block the liquid injection groove to prevent the potting glue from flowing back from the semi-closed groove into the inner cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic diagram of a conventional motor stator structure.

[0024] Figure 2A three-dimensional diagram of a motor stator potting device provided in an embodiment of the present invention.

[0025] Figure 3 It is a front view of the present invention when it is actually used.

[0026] Figure 4 It is a top view of the present invention.

[0027] Figure 5 for Figure 4 Cross-sectional view at AA in the middle.

[0028] Figure 6 for Figure 5 A partial enlarged view of point B in the middle.

[0029] Figure 7 This is a three-dimensional diagram of the lifting column, liquid storage tube and screw rod of the present invention.

[0030] Figure 8 It is a three-dimensional diagram of the inner cylinder, lower die and threaded sleeve of the present invention.

[0031] Description of reference numerals:

[0032] 1. Stator core, 2. Semi-closed slot, 3. Coil winding, 4. Inner cylinder, 5. Liquid injection groove, 6. Lifting column, 7. Lower die, 8. Positioning groove, 9. First make way cavity, 10. Upper die, 11. Second make way cavity, 12. Sealing strip, 13. Liquid storage tube, 14. Flow limiting part, 15. Flow channel, 16. Filter, 17. Guide cone, 18. Positioning ridge, 19. Bracket, 20. Threaded sleeve, 21. Screw. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Example 1:

[0035] Figure 1 The present invention is applicable to a stator with a conventional motor stator structure and a semi-closed slot 2 located on the inner wall of the stator core 1. The coil winding 3 passes through the semi-closed slot 2. Figures 2 to 8As shown, a first embodiment of the present invention provides a motor stator potting device, comprising an upper mold 10, a lower mold 7, an inner cylinder 4, and a lifting column 6. The lower mold 7 is used to fit the lower end of the stator core 1, the upper mold 10 is used to fit the upper end of the stator core 1, and the inner cylinder 4 is inserted into the inner side of the stator core 1. At the same time, the lower mold 7 is fixedly connected to the inner cylinder 4, and the lower mold 7 and the inner cylinder 4 are integrally formed. The upper mold 10 is slidably mounted on the inner cylinder 4. During use, the stator core 1 is first mounted on the inner cylinder 4 so that the lower end of the outer wall of the stator core 1 abuts the positioning groove 8 on the lower mold 7. Then, the upper mold 10 is mounted on the inner cylinder 4, and the upper mold 10 is moved downward so that the positioning groove 8 on the upper mold 10 abuts the upper end of the outer wall of the stator core 1.

[0036] like Figure 5 As shown, the lower mold 7 is provided with a first clearance cavity 9 for making room for the coil winding 3, while the upper mold 10 is provided with a second clearance cavity 11 for making room for the coil winding 3 and the lead wire. Thus, the upper mold 10, the lower mold 7, and the inner cylinder 4 cooperate to form a cover for the semi-closed slots 2 and the coil winding 3 on the stator core 1. Sealing rings are provided in the positioning grooves 8 of the upper mold 10 and the lower mold 7. When the upper mold 10 and the lower mold 7 are pressed against the stator core 1, the potting compound is prevented from flowing out of the gap between the upper mold 10 or the lower mold 7 and the stator core 1.

[0037] like Figure 8 As shown, the inner cylinder 4 of the present invention is hollow, and a plurality of long strip-shaped liquid injection grooves 5 corresponding to the semi-closed slots 2 on the stator are provided on the circumferential surface of the inner cylinder 4. Since the present embodiment is used to pot the stator core 1 with twenty-four semi-closed slots 2, there are twenty-four liquid injection grooves 5. The bottom of the liquid injection groove 5 extends to the bottom end of the inner cylinder 4. The present invention has positioning ribs 18 fixed on the outer wall of the inner cylinder 4 corresponding to the semi-closed slots 2 of the stator. The positioning ribs 18 can be inserted into the semi-closed slots 2, and the positions of the liquid injection grooves 5 and the positioning ribs 18 partially overlap. Therefore, when the positioning ribs 18 are inserted into the semi-closed slots 2, the liquid injection grooves 5 can be aligned with the semi-closed slots 2. As shown Figure 5 and Figure 7 As shown, a lifting column 6 is slidably installed in the inner tube 4, and the outer wall of the lifting column 6 slides with the inner wall of the inner tube 4. Twenty-four sealing strips 12 are evenly fixed on the circumferential outer wall of the lifting column 6, and the twenty-four sealing strips 12 are respectively slidably installed in the twenty-four liquid injection grooves 5.

[0038] like Figure 2As shown, because the injection slots 5 are elongated and the portion not engaged by the blocking strips 12 remains open, when potting compound is injected into the inner cylinder 4, the potting compound can flow from the unblocked portion of the injection slots 5 into the semi-closed slots 2. The portion of the injection slots 5 blocked by the blocking strips 12 prevents the potting compound in the semi-closed slots 2 from flowing back into the inner cylinder 4. Therefore, as the lifting columns 6 are gradually driven upward along the axial direction of the inner cylinder 4, the blocking strips 12 move from bottom to top, gradually sealing the injection slots 5 from bottom to top, allowing potting compound to be gradually poured upward from the bottom of the semi-closed slots 2 on the stator core 1. Since the potting compound in the inner cylinder 4 is connected, the potting compound can be simultaneously injected into all twenty-four semi-closed slots 2. As the potting compound flows, the liquid level rises evenly, ensuring that the stator core 1 is fully filled with potting compound.

[0039] Example 2:

[0040] On the basis of the first embodiment, the present invention facilitates driving the lifting column 6 to move and maintain the position in the inner cylinder 4, thereby being able to maintain the position of the potting glue during the potting glue curing process. Figure 5 and Figure 6 As shown, the present invention has a bracket 19 fixed at the bottom of the lower mold 7, a threaded sleeve 20 fixed on the bracket 19, a screw rod 21 threadedly mounted on the threaded sleeve 20, and the top of the screw rod 21 is rotatably mounted on the lifting column 6. Therefore, by rotating the screw rod 21, the lifting column 6 can be driven to move in the inner cylinder 4.

[0041] Example 3:

[0042] On the basis of the first and second embodiments, in order to further improve the potting effect, as shown in FIG. Figures 5 to 7 As shown, the present invention has a liquid injection unit fixedly connected to the top of the lifting column 6 via multiple connecting columns. The liquid injection unit includes a liquid storage tube 13 that is larger at the top and smaller at the bottom, and an inverted conical flow restriction 14 fixed to the bottom of the liquid storage tube 13. The flow channel 15 within the liquid storage tube 13 is also inverted conical, and the flow channel 15 extends directly beyond the flow restriction 14. A sufficient amount of potting compound can be directly injected into the liquid storage tube 13, allowing the potting compound to naturally fall through the flow channel 15 to the top of the lifting column 6, and then simultaneously inject the potting compound into all semi-closed slots 2 through the twenty-four liquid injection slots 5. Because the flow restriction 14 is also fixed with twenty-four sealing strips 12 that slide in conjunction with the liquid injection slots 5, and because the flow restriction 14 is located above the lifting column 6, the flow restriction 14 forms a barrier to the flow of the potting compound, forcing the potting compound to enter the semi-closed slots 2 only from the liquid injection slots 5 between the lifting column 6 and the flow restriction 14, thereby limiting the flow rate of the potting compound and the height at which it enters the semi-closed slots 2.

[0043] Since the liquid level of the potting glue in the liquid storage tube 13 is higher than the height of the potting glue entering the semi-closed groove 2, it can provide a higher static pressure effect, which helps the potting glue to fully penetrate into the gap of the coil winding 3, and at the same time helps to discharge bubbles, reducing or avoiding hollowing of the potting.

[0044] In order to reduce or avoid bubbles in the potting glue during the potting process, the present invention is provided with a filter 16 at the lower end of the flow channel 15. When the potting glue in the liquid storage tube 13 passes through the filter 16, the bubbles will be filtered out by the mesh or burst due to the flow. Figure 6 As shown, a guide cone 17 is provided on the top of the lifting column 6, and the highest point of the guide cone 17 is directly below the filter screen 16. The guide cone 17 can make the potting glue flow smoothly along the conical slope to the liquid injection tank 5, reducing energy loss.

[0045] During use, the stator core 1 is first placed on the inner cylinder 4 so that the positioning ridges 18 are inserted into the semi-closed slots 2, thereby aligning the liquid injection slots 5 with the semi-closed slots 2. The upper mold 10 is then placed on the inner cylinder 4 and pressed against the stator core 1 so that the upper mold 10 and the lower mold 7 support the upper and lower ends of the stator core 1. A sufficient amount of potting compound is then injected into the liquid storage tube 13. The potting compound flows downward under the action of gravity, passes through the filter 16, and falls onto the guide cone 17 and flows in all directions, while being injected into the semi-closed slots 2 of the stator core 1 from all the liquid injection slots 5. The screw 21 is rotated to gradually raise the lifting column 6 in the inner cylinder 4, thereby gradually closing the liquid injection slots 5 from bottom to top, and gradually and evenly pouring the potting compound from bottom to top, thereby making it easier to expel the air in the gaps between the coil windings 3, more fully pouring the sealant, and reducing or avoiding hollowing.

[0046] After the curing process, the upper mold 10 is removed from the inner cylinder 4 , and then the stator core 1 is pulled out from the inner cylinder 4 .

[0047] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A motor stator potting device, characterized in that: include: An inner cylinder (4), the inner cylinder (4) being hollow, and having a plurality of long strip-shaped liquid injection grooves (5) on the circumferential side surface of the inner cylinder (4) corresponding one-to-one to the semi-closed grooves (2) on the stator; A lifting column (6), wherein the lifting column (6) is arranged in the inner cylinder (4), and when the lifting column (6) moves upward along the axial direction of the inner cylinder (4), the liquid injection groove (5) is gradually closed from bottom to top; A lower die (7), the lower die (7) being fixed to the outer wall of the lower end of the inner cylinder (4), the lower die (7) being provided with a positioning groove (8) cooperating with the bottom of the stator core (1), and the lower die (7) being provided with a first clearance cavity (9) for making way for the coil winding (3); an upper die (10), the upper die (10) being sleeved on the outer wall of the upper end of the inner tube (4), the upper die (10) being provided with a positioning groove (8) cooperating with the upper part of the stator core (1), and the upper die (10) being provided with a second clearance cavity (11) for making way for the coil winding (3) and the lead wire; The potting glue flows from the top of the lifting column (6) to the multiple injection grooves (5), and is simultaneously injected into the multiple semi-closed grooves (2); One end of the liquid injection groove (5) away from the upper mold (10) passes through the bottom end of the inner cylinder (4); a plurality of sealing strips (12) corresponding to the liquid injection grooves (5) are fixed on the circumferential side wall of the lifting column (6); the sealing strips (12) are slidably matched with the liquid injection grooves (5); The top of the lifting column (6) is fixedly connected to a liquid injection unit via a plurality of connecting columns, the liquid injection unit comprising a liquid storage tube (13) and a flow limiting portion (14) fixed to the bottom of the liquid storage tube (13), and a flow channel (15) in the liquid storage tube (13) passes through the flow limiting portion (14); A plurality of sealing strips (12) that slidably cooperate with the liquid injection grooves (5) are fixed on the flow limiting portion (14).

2. A motor stator potting device as claimed in claim 1, characterized in that: The flow channel (15) is in an inverted cone shape, and a filter screen (16) is provided at the lower end of the flow channel (15).

3. A motor stator potting device as claimed in claim 2, characterized in that: A guide cone (17) is provided at the top of the lifting column (6), and the top of the guide cone (17) is located directly below the filter screen (16).

4. A motor stator potting device as claimed in claim 1, characterized in that: The top outer wall of the flow limiting portion (14) is in an inverted cone shape.

5. The motor stator potting device according to claim 1, characterized in that: The outer wall of the inner cylinder (4) is provided with a positioning ridge (18) corresponding to the semi-closed slot (2) of the stator.

6. The motor stator potting device according to claim 1, characterized in that: A threaded sleeve (20) is fixed to the lower die (7) via a bracket (19), and a screw rod (21) is rotatably mounted on the lifting column (6), wherein the screw rod (21) is threadably matched with the threaded sleeve (20).

7. The motor stator potting device according to claim 1, characterized in that: Sealing rings are provided in the positioning grooves (8) of the upper die (10) and the lower die (7).

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