A motor stator assembly glue pouring device and glue pouring process

Abstract

The present application relates to stator assembly glue filling technical field, especially to a kind of motor stator assembly glue filling device and glue filling process, comprising: glue filling mould, positioning shaft and glue filling ring, glue filling mould includes lower die holder, upper die holder and multiple connecting pieces;Positioning shaft outer circumferential surface and the inner wall of lower die holder and upper die holder are enclosed to form annular cavity, annular cavity and the axial groove of stator assembly are communicated to jointly constitute airtight glue filling cavity;Vacuum pumping assembly is used to carry out vacuum pumping treatment to glue filling cavity;Glue filling pipe is used to inject glue into annular cavity, and the cross section of glue filling ring is W type structure, the highest point in the middle is located above winding, and two lowest points correspond to the inside and outside of winding respectively;Several liquid injection holes are arranged at the corner of two lowest points along the circumferential direction at intervals.The W type structure of the present application through glue filling ring makes glue fill from the inside and outside of winding simultaneously, and cooperates with immersion type rising, solve the problem of bubble and air pocket in traditional glue filling, guarantee insulation and heat dissipation performance, improve motor operation reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stator assembly glue filling, in particular to a motor stator assembly glue filling device and glue filling process. BACKGROUND

[0002] In the motor production process, the stator assembly glue filling device is the key equipment to realize the insulation, fixation and performance enhancement of the gap between the stator core and the winding. It precisely injects insulating glue (such as epoxy resin glue) into the gap to achieve the core goals of winding fixation, insulation improvement, heat dissipation optimization and moisture protection.

[0003] The existing glue filling device includes glue filling templates located at both ends of the stator assembly and clamping the stator assembly, and a positioning shaft penetrating through the center hole of the stator. The glue filling template at the bottom is a closed structure, and the glue filling template at the top is an open structure. The side wall of the glue filling template and the positioning shaft enclose the annular converging cavity at both ends of the stator assembly. After the glue is injected into the converging cavity, part of the glue will gradually penetrate the inside of the winding and slowly diffuse to the bottom. Another part of the glue will flow along the inner and outer gaps of the winding and directly and quickly flow to the lower end of the winding under the action of gravity.

[0004] However, due to the great difference in flow speed between the two paths of glue penetration through the winding and direct flow, the glue filling of the upper and lower parts of the stator is not synchronized. This asynchronization causes the air in the gap between the windings to be unable to be discharged in time with the glue filling, and thus air bubbles are formed in the local area (especially in the densely packed area of the winding), or air pockets are generated in the area not fully filled with glue, resulting in poor insulation and heat dissipation performance of the stator winding, which seriously affects the operation reliability and service life of the motor. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a motor stator assembly glue filling device and glue filling process to effectively solve the problems in the background art.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows: a motor stator assembly glue filling device and glue filling process, comprising:

[0007] A glue filling mold includes a lower mold base and an upper mold base located at both ends of the stator assembly, and a plurality of connecting pieces distributed in the circumferential direction for clamping and fixing the lower mold base and the upper mold base;

[0008] A positioning shaft coaxially penetrates the center hole of the stator assembly. The outer periphery of the positioning shaft and the inner walls of the lower mold base and the upper mold base enclose an annular cavity. The annular cavity is in communication with the axial groove of the stator assembly to form a closed glue filling cavity.

[0009] A vacuum pumping assembly is provided on the upper mold base for vacuum pumping treatment of the glue filling cavity;

[0010] A glue filling pipe is arranged on the upper die seat and used for injecting glue into the annular cavity;

[0011] The annular cavity of the upper die seat is provided with a glue filling ring, and the cross section of the glue filling ring is in a W-shaped structure. The middle highest point of the W-shaped structure is located directly above the winding of the stator assembly, and the two lowest points correspond to the inner side and the outer side of the winding, respectively.

[0012] A plurality of glue injection holes are arranged at the corners of the two lowest points of the glue filling ring in a circumferential direction. The glue falls to the side wall of the annular cavity through the plurality of glue injection holes and enters the axial grooves on the inner side and the outer side of the winding along the side wall to form a glue injection path.

[0013] Further, the end surface of the upper die seat and / or the lower die seat facing the stator assembly is provided with a gas permeable groove corresponding to the position of the heat dissipation groove of the stator assembly in a circumferential direction;

[0014] The gas permeable groove penetrates the outer circumferential surface of the upper die seat and / or the lower die seat in a radial direction of the stator assembly.

[0015] Further, the lower die seat and the upper die seat are both provided with a sealing plate between the stator assembly;

[0016] The center of the sealing plate is provided with a through hole for the winding end to pass through, and the outer edges of the two sealing plates are clamped to the sealing plate in a circumferential direction through a plurality of connecting pieces to realize axial fixation of the stator assembly;

[0017] A plurality of positioning grooves are arranged on the outer circumferential surface of the stator assembly in a circumferential direction, and a plurality of connecting pieces are embedded in the positioning grooves one by one.

[0018] Further, the sealing plate is provided with a converging groove corresponding to the heat dissipation groove of the stator assembly, and the converging groove is arranged in a penetrating manner in an axial direction.

[0019] Further, the contact surface of the sealing plate with the upper die seat and the lower die seat is provided with a first convex ring at the inner edge, and the upper die seat and the lower die seat are both provided with a groove for embedding the first convex ring;

[0020] And a gap is arranged at the contact surface of the two sealing plates with the stator assembly at the inner edge;

[0021] The first sealing structure is arranged on both contact surfaces of the sealing plate.

[0022] Further, the glue filling ring comprises:

[0023] A liquid blocking platform is arranged at the highest point;

[0024] Two flow guide plates are formed by extending downward along the inner and outer edges of the liquid blocking platform.

[0025] Two limiting plates are folded upwards along the bottom edges of the two guide plates to extend and form;

[0026] The free ends of the two limiting plates abut against the side wall of the annular cavity, the guide plate and the limiting plate form a guide ring groove in the upper region of the intersection position, and a plurality of liquid injection holes are distributed equidistantly along the circumferential direction on the bottom of the guide ring groove.

[0027] Further, an exhaust ring is arranged above the liquid blocking platform, and a gas collecting cavity is arranged in the exhaust ring.

[0028] The liquid blocking platform is provided with a plurality of exhaust holes in communication with the gas collecting cavity, and an exhaust pipe is arranged on the exhaust ring, the exhaust end of the exhaust pipe extends out of the upper mold base, and a micro check valve is arranged at the extending end.

[0029] Further, one end of the glue filling pipe penetrates through the upper mold base and communicates with the annular cavity, and the other end is used for connecting a glue liquid supply device to inject glue liquid into the annular cavity.

[0030] Further, the vacuum pumping assembly comprises a vacuum air exhaust pipe, a vacuum pressure gauge mounted on a branch pipe of the vacuum air exhaust pipe close to the annular cavity, and a vacuum electromagnetic valve and a vacuum pump connected with the vacuum air exhaust pipe.

[0031] The vacuum air exhaust pipe communicates with the annular cavity through an air exhaust hole formed in the upper mold base, and is used for vacuumizing the glue filling cavity.

[0032] The application also provides a motor stator assembly glue filling process, which adopts the motor stator assembly glue filling device as described above, and comprises the following steps:

[0033] The glue filling mold and the positioning shaft are installed on the stator assembly and subjected to air tightness detection.

[0034] After the air tightness detection is completed, the vacuum pumping assembly is started, the glue filling cavity is vacuumized through the air exhaust hole of the upper mold base, and the vacuum degree in the glue filling cavity is stabilized in the target range.

[0035] After the vacuum degree is stabilized, the glue liquid supply device is started, the glue liquid is injected into the annular cavity of the upper mold base through the glue filling pipe, first flows into the W-shaped structure of the glue filling ring, and then flows into the inner axial groove and the outer axial groove of the stator along the side wall of the annular cavity under the action of gravity and vacuum negative pressure, gradually penetrates and fills the gap between the winding and the stator core.

[0036] When the glue liquid filling amount reaches the preset value, the glue liquid supply device is closed, and the glue injection is stopped; the vacuum degree and the glue liquid pressure in the glue filling cavity are maintained, and the pressure maintaining time is set;

[0037] Move the entire mold into the oven, set the curing parameters, and maintain a slight vacuum during the period;

[0038] After curing is completed, the vacuum component is closed, dry air is slowly introduced into the glue filling cavity, until the pressure in the cavity returns to normal pressure, then the circumferential connecting piece is loosened, the upper mold base, the positioning shaft are sequentially disassembled, the stator assembly is taken out from the lower mold base, and the residual glue liquid flash on the stator end face is cleaned;

[0039] Through visual or ultrasonic detection, it is confirmed that there is no air bubble in the winding, no glue defect in the glue layer, and the glue liquid filling is full, if the requirements are met, it is determined that the glue filling is qualified, and the next process is entered; if there is air bubble or glue defect, the reason needs to be analyzed and reworked.

[0040] The beneficial effects of the present application are: in the present application, through the structural design of the W-shaped glue filling ring, the glue liquid is directionally divided into the gap inside and outside the winding through the two lowest injection holes, forming independent and symmetrical glue injection paths, ensuring that the glue liquid is filled synchronously from the inside and outside of the winding; combined with the immersion rising process of the glue liquid from bottom to top after converging along the axial groove, air wrapping formed by glue liquid accumulation or lag in local area is avoided; at the same time, the active exhaust function of the vacuum component to the sealed glue filling cavity further promotes the gradual exhaust of air in the winding gap along with the glue liquid filling, fundamentally solves the problems of air bubble and air pocket in traditional glue filling, ensures the integrity of the insulation performance and heat dissipation path of the winding, and further improves the operation reliability of the motor.

[0041] In the present application, the W-shaped glue filling ring utilizes the height difference of its own section to form a natural flow guide slope, and the glue liquid can automatically flow to the target position along the slope under the action of gravity without additional power; at the same time, the evenly distributed injection holes on the glue filling ring make the glue liquid enter the winding gap from multiple points synchronously, avoiding the local high flow rate or disorder caused by single-point glue filling, ensuring smooth glue liquid flow, and greatly improving the consistency of the glue filling quality of the stator assembly in batch production. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0043] Figure 1 It is a structural assembly diagram of the motor stator assembly glue filling device in the embodiments of the present application;

[0044] Figure 2 is a structure exploded schematic view of the motor stator assembly glue pouring device in the embodiment of the present application;

[0045] Figure 3 is a top view of the motor stator assembly glue pouring device in the embodiment of the present application;

[0046] Figure 4 is a structure exploded schematic view of the motor stator assembly glue pouring device in the embodiment of the present application; Figure 3 is a cross-sectional view of A-A of the motor stator assembly glue pouring device in the embodiment of the present application;

[0047] Figure 5 is a cross-sectional view of B of the motor stator assembly glue pouring device in the embodiment of the present application; Figure 4 is a local enlarged view of B of the motor stator assembly glue pouring device in the embodiment of the present application;

[0048] Figure 6 is a cross-sectional view of the motor stator assembly glue pouring device after glue pouring in the embodiment of the present application;

[0049] Figure 7 is a cross-sectional view of C of the motor stator assembly glue pouring device in the embodiment of the present application; Figure 6 is a local enlarged view of C of the motor stator assembly glue pouring device in the embodiment of the present application;

[0050] Figure 8 is a structure schematic view and a local enlarged view of the glue pouring ring in the embodiment of the present application;

[0051] Figure 9 is a first perspective view schematic view of the sealing plate installed on the stator assembly in the embodiment of the present application;

[0052] Figure 10 is a second perspective view schematic view of the sealing plate installed on the stator assembly in the embodiment of the present application;

[0053] Figure 11 is a schematic view of the installation of the glue pouring mold and the positioning shaft in the embodiment of the present application;

[0054] Figure 12 is a schematic view of the installation of the glue pouring ring in the embodiment of the present application.

[0055] The figure mark: 10, stator assembly; 10a, winding; 1, glue pouring mold; 11, lower mold base; 11a, air vent groove; 11b, groove; 12, upper mold base; 13, connecting piece; 2, positioning shaft; 2a, annular cavity; 3, glue pouring ring; 3a, liquid injection hole; 31, liquid blocking platform; 311, exhaust hole; 32, flow guide plate; 33, limiting plate; 34, exhaust ring; 35, exhaust pipe; 4, sealing plate; 41, through hole; 42, busbar groove; 43, first convex ring. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0057] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0059] like Figures 1 to 12 The shown motor stator assembly 10 potting device includes:

[0060] The potting mold 1 includes a lower mold base 11 and an upper mold base 12 located at both ends of the stator assembly 10, and a plurality of connecting parts 13 distributed circumferentially for clamping and fixing the lower mold base 11 and the upper mold base 12.

[0061] The positioning shaft 2 is coaxially inserted into the center hole of the stator assembly 10. The two ends of the positioning shaft 2 are sealed and fixed to the lower mold base 11 and the upper mold base 12 respectively. The outer peripheral surface of the positioning shaft 2 and the inner walls of the lower mold base 11 and the upper mold base 12 form an annular cavity 2a. The annular cavity 2a is connected to the axial groove of the stator assembly 10, and together they form a closed potting cavity.

[0062] A vacuum assembly, mounted on the upper mold base 12, is used to vacuum the potting cavity.

[0063] A glue-filling tube, set on the upper mold base 12, is used to inject glue into the annular cavity 2a;

[0064] Among them, a potting ring 3 is provided in the annular cavity 2a of the upper mold base 12. The cross-section of the potting ring 3 is W-shaped. The highest point in the middle of the W-shaped structure is located directly above the winding 10a of the stator assembly 10, while the two lowest points correspond to the inner and outer sides of the winding 10a, respectively.

[0065] A plurality of injection holes 3a are arranged at the corners of the two lowest points of the glue injection ring 3 in the circumferential direction, and glue falls to the side wall of the annular cavity 2a through the injection holes 3a and enters the axial slots on the inner and outer sides of the winding 10a to form a glue injection path. It should be noted that the winding 10a is arranged in the annular cavity 2a, and forms an outer annular gap with the upper and lower mold bases 11 and an inner annular gap with the outer cylindrical surface of the positioning shaft 2, and the two lowest points correspond to the outer annular gap and the inner annular gap. Preferably, the connecting member 13 adopts a bolt or buckle structure, which can provide locking force in the axial direction to ensure end face sealing.

[0066] In the present application, the stator assembly 10 includes a stator core and a winding 10a. The stator core is formed by laminating silicon steel sheets, and a plurality of axial slots are arranged in the circumferential direction of the stator core, each of which penetrates both end faces in the axial direction of the stator core. The winding 10a is wound by enameled wire, the main body of which is embedded in the axial slot, and the two ends of the winding 10a protrude from the two end faces of the stator core, respectively. The axial slot embedded with the winding 10a forms a gap on the inner side and the outer side in the radial direction, which is the target area for glue filling. When the glue injection device and the stator assembly 10 are assembled, first, the lower mold base 11 is attached to the lower end face of the stator core, and the upper mold base 12 is attached to the upper end face of the stator core. The outer periphery of the lower mold base 11 and the upper mold base 12 is uniformly distributed with connecting holes in the circumferential direction. The connecting holes of the upper mold base 12 and the lower mold base 11 are locked by the connecting member 13, so that the stator assembly 10 is clamped and fixed. Secondly, the positioning shaft 2 is coaxially inserted into the center hole of the stator core. The lower end of the positioning shaft 2 is provided with an annular sealing groove on the outer periphery, and an O-shaped sealing ring is embedded in the groove, so that the lower end face of the positioning shaft 2 is tightly attached to the inner cavity bottom of the lower mold base 11, realizing double sealing in the radial and axial directions. The outer periphery of the positioning shaft 2 and the inner wall of the lower mold base 11 and the inner wall of the upper mold base 12 form an upper annular cavity 2a on the side of the upper mold base 12 and a lower annular cavity 2a on the side of the lower mold base 11. The axial slots of the stator core are in communication with the upper and lower annular cavities 2a, and together constitute a closed glue injection cavity, and the two end portions of the winding 10a and the inner and outer side gaps are located in the glue injection cavity.

[0067] The initial state of the glue filling pipe is closed, a vacuum pumping assembly is started, and the glue filling cavity is subjected to vacuum pumping treatment, so that the vacuum degree in the glue filling cavity reaches a set range, and a vacuum state is maintained for 3-5 minutes; the glue filling pipe is opened, and the glue solution is pumped into the annular cavity 2a through the glue filling pipe, the outlet of the glue filling pipe is opposite to the highest point of the W-shaped structure of the glue filling ring 3, under the action of gravity and vacuum environment, the glue solution is distributed to the corner positions of the two lowest points along the inclined surface of the W-shaped structure of the glue filling ring 3, and is injected into the gap between the inside and outside of the winding 10a through the uniformly distributed liquid injection holes 3a; the glue solution entering the gap flows downward along the axial groove and collects in the lower annular cavity 2a, as the glue solution continues to be injected, the liquid level in the glue filling cavity rises smoothly, and the winding 10a in the axial groove is immersed from bottom to top, in the process of rising of the liquid level, the micro amount of air remaining in the winding 10a rises along with the liquid level and is discharged through the upper annular cavity 2a and the vacuum pumping assembly, and finally the uniform glue filling of the whole winding 10a is completed.

[0068] In the application, the structure design of the W-shaped glue filling ring 3 makes the glue solution be directional distributed to the gap between the inside and outside of the winding 10a through the liquid injection holes 3a at the two lowest points, forms a glue injection channel, and ensures that the glue solution is filled synchronously from the inside and outside of the winding 10a; in combination with the immersion rising process of the glue solution from bottom to top after converging along the axial groove, air wrapping formed by glue solution accumulation or lag in local areas is avoided; at the same time, the active exhaust function of the vacuum pumping assembly to the sealed glue filling cavity further promotes the air in the gap of the winding 10a to be gradually discharged along with the glue filling, solves the problems of air bubbles and air pockets in the traditional glue filling, guarantees the insulation performance and the integrity of the heat dissipation path of the winding 10a, and further improves the operation reliability and service life of the motor.

[0069] In the application, the W-shaped glue filling ring 3 utilizes the height difference of its own section to form a natural flow guide slope, the glue solution can be automatically distributed to the target position along the inclined surface under the action of gravity without additional power; at the same time, the uniformly distributed liquid injection holes 3a on the glue filling ring 3 make the glue solution enter the gap of the winding 10a from multiple points synchronously, avoid the local flow rate being too fast or being turbulent caused by single-point glue filling, ensure the smooth flow of the glue solution, and greatly improve the consistency of the glue filling quality of the stator assembly 10 in batch production.

[0070] In the application, the sealing fixation of the positioning shaft 2 and the lower die seat 11 and the upper die seat 12 integrates the axial groove and the annular cavity 2a into a sealed glue filling cavity, in combination with the active reduction of the cavity air pressure by the vacuum pumping assembly, the air in the gap of the winding 10a is more easily separated from the surface of the glue solution and quickly discharged under the action of negative pressure, compared with the natural exhaust mode of the prior art, the exhaust efficiency is significantly improved, the micro air bubbles or shrinkage holes formed by the air not discharged in the glue layer are effectively avoided, the close combination of the glue layer and the winding 10a and the core is ensured, and finally the service life of the motor is prolonged.

[0071] In the preferred embodiment of the present application, the upper die holder 12 and / or the lower die holder 11 is provided with a ventilation groove 11a on the end surface facing the stator assembly 10, which corresponds to the position of the heat dissipation groove of the stator assembly 10 in the circumferential direction; the ventilation groove 11a penetrates the outer circumferential surface of the upper die holder 12 and / or the lower die holder 11 outward along the radial direction of the stator assembly 10.

[0072] In the present scheme, when the upper die holder 12 and the lower die holder 11 are both provided with the ventilation groove 11a, the ventilation groove 11a and the heat dissipation groove together form an airflow passage through both ends of the stator assembly 10, which quickly leads out heat through natural convection or forced air cooling, avoiding overheating of the stator core or winding 10a due to heat accumulation; when only the upper die holder 12 or only the lower die holder 11 is provided with the ventilation groove 11a, the ventilation groove 11a and the heat dissipation groove together form a one-way open airflow passage, which effectively prevents impurities such as dust and moisture in the external environment from entering the heat dissipation groove while dissipating heat from the stator assembly 10, especially suitable for scenarios with high cleanliness requirements for the stator.

[0073] In the present application, when the lower die holder 11 and the upper die holder 12 directly contact the stator assembly 10 and are clamped by the connecting piece 13, the lower die holder 11 and the upper die holder 12 tend to rotate synchronously during operation due to the lack of circumferential limiting structure. This relative rotation can cause the silicon steel sheets on the end surface of the stator to be rubbed or pressed, resulting in deformation or wear, which affects the structural integrity of the stator assembly 10. Therefore, in order to reduce the damage to the silicon steel sheets on the end surface of the stator, preferably, the lower die holder 11 and the upper die holder 12 are both provided with a sealing plate 4 between them and the stator assembly 10; the center of the sealing plate 4 is provided with a through hole 41 for the end portion of the winding 10a to pass through, and the outer edges of the two sealing plates 4 are clamped by a plurality of connecting pieces 13 in the circumferential direction to achieve axial fixation of the stator assembly 10; a plurality of positioning grooves are provided on the outer circumferential surface of the stator assembly 10 in the circumferential direction, and a plurality of connecting pieces 13 are embedded in the positioning grooves one by one.

[0074] The sealing plate 4 serves as a transition piece between the die holder and the stator assembly 10, and its outer edge is clamped with the die holder by the connecting piece 13, so that the clamping force is uniformly transmitted to the end surface of the stator through the sealing plate 4 instead of being concentrated locally, effectively preventing the deformation of the stator core caused by uneven distribution of clamping force. At the same time, the positioning groove radially limits the connecting piece 13, preventing it from sliding along the outer circumference of the stator during clamping, ensuring the stability of the clamping position and avoiding the wear caused by sliding friction on the end surface of the stator.

[0075] On the basis of the above scheme, the sealing plate 4 is provided with a flow collection groove 42 corresponding to the heat dissipation groove of the stator assembly 10, which is arranged in the axial direction.

[0076] The heat dissipation grooves of the stator are a plurality of independent channels distributed in the axial direction, the track edges of the converging groove 42 surround the end portions of the plurality of heat dissipation grooves, the airflow of the dispersed heat dissipation grooves is collected into the converging groove 42, the airflow forms a stable air pressure field in the backflow groove, and then is concentrated and discharged through the air-permeable groove 11a of the mold base, which significantly reduces the airflow resistance and improves the discharge efficiency of hot air.

[0077] In a further preferred embodiment, the contact surfaces of the sealing plates 4 with the upper mold base 12 and the lower mold base 11 are provided with first convex rings 43 at the inner edges, and the upper mold base 12 and the lower mold base 11 are each provided with a groove 11b for embedding the first convex ring 43; while the contact surfaces of the two sealing plates 4 with the stator assembly 10 are provided with gaps at the inner edges; and the first sealing structure is provided on both contact surfaces of the sealing plate 4.

[0078] The embedded cooperation of the first convex ring 43 and the groove 11b forms a labyrinth seal, and the outer peripheral surface of the first convex ring 43 tightly fits the inner wall of the groove 11b, which prolongs the path of the overflow of the glue solution, increases the resistance, and the first sealing structure is additionally provided on the end surface of the sealing plate 4 outside the first convex ring 43, which further eliminates the gap through interference fit and effectively blocks the leakage of the glue solution to the outside of the mold base; and the gap reserved on the contact surface of the sealing plate 4 with the stator forms a stepped structure with the first convex ring 43, when the first convex ring 43 is rigidly supported, the sealing ring of the first sealing structure can realize flexible deformation at the gap, thereby improving the tightness with the end surface of the stator, and playing a role in sealing the glue filling cavity. Preferably, the first sealing structure adopts an O-shaped sealing ring, but is not limited to the above sealing structure.

[0079] The glue filling ring 3 in the application includes a liquid blocking platform 31, two flow guide plates 32 and two limiting plates 33, the liquid blocking platform 31 is arranged at the highest point position; the two flow guide plates 32 are inclined downward along the inner and outer edges of the liquid blocking platform 31; the two limiting plates 33 are upwardly folded and extended along the bottom edges of the two flow guide plates 32.

[0080] Among them, the free ends of the two limiting plates 33 abut on the side wall of the annular cavity 2a, the flow guide plate 32 and the limiting plate 33 are located above the intersection position to form a flow guide ring groove, and a plurality of liquid injection holes 3a are distributed equidistantly in the circumferential direction at the bottom of the flow guide ring groove.

[0081] Specifically, the liquid blocking platform 31 is a ring-shaped flat structure for receiving the glue liquid injected from the glue injection pipe, the flow guide plate 32 is a conical cylinder structure, the flow guide plate 32 located at the inner edge is a reverse conical structure, the flow guide plate 32 located at the outer edge is a positive conical structure, and the two conical flow guide plates 32 have the same taper, and the limiting plates 33 are respectively folded and extended upwards along the bottom edges of the inner and outer flow guide plates 32, and the free ends of the limiting plates 33 away from the flow guide plates 32 abut against the side wall of the annular cavity 2a through interference fit, that is, the inner limiting plate 33 abuts against the outer periphery of the positioning shaft 2, and the outer limiting plate 33 abuts against the inner wall of the upper mold seat 12, so that the radial positioning of the glue injection ring 3 is realized. It should be noted that the inclination angles of the two flow guide plates 32 and the two limiting plates 33 are determined according to the distance of the annular groove, so that the limiting plates 33 abut against the side wall of the annular cavity 2a, and the radial deviation of the glue injection ring 3 under the impact of the glue liquid and the vacuum environment is ensured, and the alignment accuracy of the injection hole 3a and the gap between the windings 10a is ensured.

[0082] After the glue liquid is injected from the glue injection pipe, it first falls to the top surface of the liquid blocking platform 31. Since the liquid blocking platform 31 is horizontally arranged, the glue liquid spreads to all directions under the action of gravity, flows downward along the inclined surfaces of the inner and outer flow guide plates 32, and converges in the flow guide ring groove after being blocked by the limiting plates 33; when the liquid level of the glue liquid in the ring groove exceeds the height of the injection hole 3a, the glue liquid is simultaneously discharged through the injection holes 3a distributed at equal intervals, and is injected into the gaps on the inner side and the outer side of the windings 10a, so that the uniform distribution and directional introduction of the glue liquid are realized.

[0083] In the present application, when the glue liquid is injected into the annular cavity 2a above, a small amount of air will be brought into the glue injection cavity along with the glue liquid. During the process of the glue liquid flowing along the horizontal groove to the bottom of the annular cavity 2a, the free gas will be retained in the area below the liquid blocking plate due to the influence of the negative pressure in the cavity, resulting in that the glue liquid cannot be completely injected. Therefore, in order to solve the problem of gas retention in the area of the glue injection ring 3, an exhaust ring 34 is arranged above the liquid blocking platform 31, and a gas collecting cavity is arranged in the exhaust ring 34; the liquid blocking platform 31 is provided with a plurality of exhaust holes 311 communicating with the gas collecting cavity, and an exhaust pipe 35 is arranged on the exhaust ring 34, the exhaust end of the exhaust pipe 35 extends out of the upper mold seat 12, and a micro one-way valve is arranged at the extending end (not shown in the figure).

[0084] The exhaust pipe 35 continuously discharges the gas out of the glue injection cavity, ensures that the gas collecting cavity is always in a low pressure state, and maintains the continuous capturing ability of the free gas; and the gas collecting cavity of the exhaust ring 34 can dynamically adjust the air pressure through the micro one-way valve, so that the air pressure near the liquid blocking platform 31 is consistent with the overall vacuum environment of the glue injection cavity, avoiding the flow disorder of the glue liquid caused by the local air pressure difference, and ensuring the smooth distribution of the glue liquid along the flow guide plate 32.

[0085] The combination of the exhaust ring 34 and the exhaust pipe 35 can realize the active exhaust function of precise capture and directional discharge, which makes up for the defect of the traditional vacuum exhaust that the partial area of the glue filling ring 3 is not covered; and the micro one-way valve can block the backflow of external air while ensuring the exhaust efficiency by responding to the pressure difference, which further improves the exhaust reliability of the glue filling process and reduces the risk of air bubble defects.

[0086] The one-way valve is a diaphragm type or ball type one-way valve, which is small in size and sensitive in response, and is installed at the end of the exhaust pipe 35 to ensure quick response when the vacuum degree of the glue filling space fluctuates. When the internal air pressure is lower than the external air pressure, the valve core is automatically closed by the spring force or its own gravity; when the internal air is discharged, the small air pressure difference can drive the valve core to open.

[0087] In the present application, one end of the glue filling pipe penetrates the upper mold seat 12 and communicates with the annular cavity 2a, and the other end is used to connect the glue liquid supply device (not shown in the figure) to inject glue liquid into the annular cavity 2a.

[0088] Specifically, the glue liquid supply device includes a glue storage tank, a gear pump, a one-way valve installed between the outlet of the gear pump and the glue filling pipe, an electromagnetic flow sensor and a proportional regulating valve connected in series in the straight pipe section of the glue filling pipe, a pressure sensor embedded in the annular cavity 2a, and a PLC control unit; a liquid level sensor is arranged in the glue storage tank to monitor the remaining amount of glue liquid in real time, and a glue supplement reminder is triggered when the liquid level is below the threshold value to ensure the stability of the flow; and the gear pump directly responds to the feedback signals of the flow sensor and the pressure sensor.

[0089] The glue liquid from the glue storage tank passes through the filter into the variable frequency gear pump, is pressurized, and then passes through the one-way valve, the electromagnetic flow sensor, and the proportional regulating valve in sequence, and finally is injected into the annular cavity 2a through the glue filling pipe; at the same time, the pressure sensor detects the pressure in the annular cavity 2a, and the flow sensor detects the real-time flow, and the signals of the two are transmitted to the PLC control unit, and the PLC control unit adjusts the rotating speed of the gear pump and the opening degree of the proportional regulating valve to stabilize the flow and pressure in the target range, realizing precise control of the glue liquid supply.

[0090] Through the linkage control of pressure and flow, the present application can automatically adapt to the conditions of low initial cavity pressure and high full glue pressure during the glue filling process in the annular cavity 2a, avoiding the flow fluctuation caused by manual adjustment.

[0091] In the present application, the vacuum assembly (not shown in the figure) includes a vacuum exhaust pipe, a vacuum pressure gauge installed on the branch pipe of the vacuum exhaust pipe close to the annular cavity 2a, and a vacuum electromagnetic valve and a vacuum pump connected with the vacuum exhaust pipe; the vacuum exhaust pipe communicates with the annular cavity 2a through the exhaust hole opened in the upper mold seat 12, and is used for vacuumizing the glue filling cavity.

[0092] In the implementation process, the PLC issues an instruction, the vacuum electromagnetic valve is powered on, the vacuum pump is started, and the air in the annular cavity 2a is discharged; the vacuum pressure gauge detects the vacuum degree in the annular cavity 2a in real time, and feeds back a signal to the PLC; if the vacuum degree does not reach the target, the PLC maintains the full-speed operation of the vacuum pump to continuously pump air; if the vacuum degree reaches the target range, the PLC controls the vacuum pump to reduce the speed to avoid excessive pumping to cause energy waste; when the vacuum degree in the annular cavity 2a is stable in the target range and remains for a preset time, the PLC links the glue supply device to start glue pouring; during the glue pouring process, the vacuum pumping assembly continuously operates: a small amount of air entrained when the glue is injected will quickly move to the air outlet under the action of negative pressure and be pumped out, and the vacuum pressure gauge monitors the vacuum degree fluctuation caused by the glue filling in real time, and the PLC maintains the stability of the vacuum degree by fine-tuning the power of the vacuum pump; after the glue pouring is completed, the PLC first closes the vacuum electromagnetic valve to cut off the air pumping path, and then stops the vacuum pump.

[0093] In the application, the vacuum pump is controlled by the PLC control unit to pump the glue pouring cavity, which can reduce the air pressure in the cavity, so that the air and volatile components mixed in the glue are pumped out under the action of negative pressure, to avoid the formation of air bubbles after the glue solidifies, thereby ensuring the insulation performance, structural strength and heat dissipation effect of the motor stator after glue pouring. The linkage control of vacuum pumping and glue supply is realized by the PLC to avoid premature glue pouring due to insufficient vacuum degree or excessive pumping to waste energy, and to improve the process stability.

[0094] The application also provides a motor stator assembly glue pouring process applied to a motor stator assembly glue pouring device, which comprises the following steps:

[0095] The glue pouring mold 1 and the positioning shaft 2 are installed on the stator assembly 10 and subjected to air tightness detection.

[0096] After the air tightness detection is completed, the vacuum pumping assembly is started to pump the glue pouring cavity through the air outlet of the upper mold seat 12 until the vacuum pressure gauge shows that the vacuum degree in the glue pouring cavity is stable in the target range; the air in the glue pouring cavity is ensured to be fully discharged to create a low-pressure environment for subsequent glue filling.

[0097] After the vacuum degree is stable, the glue supply device is started, the glue is injected into the annular cavity 2a of the upper mold seat 12 through the glue pouring pipe, and first flows into the W-shaped structure of the glue pouring ring 3; under the action of gravity and vacuum negative pressure, the glue is divided into two lowest points along the inclined surface of the W-shaped structure and flows together at the glue injection hole 3a at the corner; the glue falls to the side wall of the annular cavity 2a through the circumferentially spaced glue injection holes 3a, flows into the inside and outside axial grooves of the stator along the side wall, and gradually penetrates and fills the gap between the winding 10a and the stator core;

[0098] When the glue liquid filling amount reaches the preset value, the glue liquid supply device is closed, the glue injection is stopped, the vacuum degree and the glue liquid pressure in the glue injection cavity are maintained, and the pressure maintaining time is set; the glue liquid is ensured to fully penetrate into the fine gap of the winding 10a, and the bubble residue is reduced;

[0099] The whole mold is moved into the oven, the curing parameters are set, and a slight vacuum is maintained during the period; the trace gas released during the curing of the glue liquid is avoided to form bubbles, and the combination tightness of the glue liquid and the winding 10a is promoted.

[0100] After the curing is completed, the vacuum component is closed, dry air is slowly introduced into the glue injection cavity, the pressure is avoided to be suddenly changed to cause the glue layer to crack, until the pressure in the cavity is restored to normal pressure, the circumferential connecting piece 13 is loosened, the upper mold base 12 and the positioning shaft 2 are sequentially disassembled, the stator assembly 10 is taken out from the lower mold base 11, and the glue liquid flash remaining on the stator end face is cleaned;

[0101] It is confirmed through visual or ultrasonic detection that there is no bubble in the winding 10a, no glue missing in the glue layer, and the glue liquid filling is full, if the above requirements are met, the glue injection is determined to be qualified, and the next process is entered; if there is a bubble or a missing glue, the cause needs to be analyzed and reworked.

[0102] Through the directional shunt design of the W-shaped glue injection ring 3, combined with the negative pressure filling in the vacuum environment, the uniform distribution of the glue liquid along the inner and outer axial grooves of the winding 10a is realized, the problems of inner missing glue and bubble residue in the traditional glue injection are solved, and through the sealing structure of the mold and the positioning shaft 2, it is ensured that the glue liquid only flows in the preset glue injection cavity, and the consistency and reliability of the stator glue injection are improved.

[0103] Those skilled in the art should understand that the present application is not limited to the above embodiments, the above embodiments and descriptions in the specification are only to illustrate the principles of the present application, various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A glue filling device for motor stator assembly, characterized in that, The application relates to a glue-filling mold for a stator assembly. The glue-filling mold comprises a lower mold base and an upper mold base located at two ends of the stator assembly, and a plurality of connecting members distributed in a circumferential direction and used for clamping and fixing the lower mold base and the upper mold base. A positioning shaft is coaxially arranged in a central hole of the stator assembly, and an outer circumferential surface of the positioning shaft and inner walls of the lower mold base and the upper mold base form an annular cavity. A vacuum extraction assembly is arranged on the upper mold base and used for vacuum extraction treatment of the glue-filling cavity. A glue-filling pipe is arranged on the upper mold base and used for injecting glue into the annular cavity. A glue-filling ring is arranged in the annular cavity of the upper mold base, and a cross section of the glue-filling ring is in a W-shaped structure. Two lowest points of the W-shaped structure correspond to inner and outer sides of windings of the stator assembly.

2. The motor stator assembly potting device of claim 1, wherein, A plurality of injection holes are arranged at corners of the two lowest points of the glue-filling ring in a circumferential direction. Glue falls to a side wall of the annular cavity through the injection holes and enters axial grooves of the inner and outer sides of the windings to form glue injection channels.

3. The motor stator assembly potting device of claim 1, wherein, End faces of the upper mold base and / or the lower mold base facing the stator assembly are provided with air-permeable grooves corresponding to positions of heat dissipation grooves of the stator assembly. The air-permeable grooves penetrate outer circumferential surfaces of the upper mold base and / or the lower mold base along a radial direction of the stator assembly. Sealing plates are arranged between the lower mold base, the upper mold base and the stator assembly.

4. The motor stator assembly potting device of claim 3, wherein, Central holes of the sealing plates are provided for passing through the windings, and outer edges of the two sealing plates are clamped by the connecting members in a circumferential direction to axially fix the stator assembly.

5. The motor stator assembly potting device of claim 3, wherein, A plurality of positioning grooves are arranged on an outer circumferential surface of the stator assembly in a circumferential direction, and the connecting members are embedded in the positioning grooves one by one. A flow converging groove is arranged on the sealing plate corresponding to the heat dissipation groove of the stator assembly and is arranged in an axial direction. First convex rings are arranged on contact surfaces of the sealing plates and inner edges of the upper mold base and the lower mold base.

6. The motor stator assembly potting device of claim 1, wherein, Gaps are arranged on contact surfaces of the two sealing plates and the stator assembly. First sealing structures are arranged on the two contact surfaces of the sealing plate. The glue-filling ring comprises: A liquid blocking platform is arranged at the highest point. Two flow guide plates are formed by downwardly and obliquely extending along inner and outer edges of the liquid blocking platform.

7. The motor stator assembly potting device of claim 6, wherein, Two limiting plates are formed by upwardly and obliquely extending along bottom edges of the two flow guide plates. Free ends of the two limiting plates abut on a side wall of the annular cavity. An upper area of an intersection position of the flow guide plates and the limiting plates forms a flow guide ring groove. A plurality of injection holes are equally distributed in a circumferential direction at a bottom of the flow guide ring groove. An exhaust ring is arranged above the liquid blocking platform. The liquid blocking platform is provided with a plurality of exhaust holes communicating with a gas collecting cavity, and an exhaust pipe is arranged on the exhaust ring. An exhaust end of the exhaust pipe extends out of the upper mold base, and a micro one-way valve is arranged at the exhaust end.

8. The motor stator assembly potting device of claim 1, wherein, One end of the glue filling pipe is communicated with the annular cavity through the upper die seat, and the other end is used for connecting a glue liquid supply device to inject glue liquid into the annular cavity.

9. The motor stator assembly potting device of claim 1, wherein, The vacuumizing assembly comprises a vacuum air pipe, a vacuum pressure gauge installed on a branch pipe of the vacuum air pipe close to the annular cavity, and a vacuum electromagnetic valve and a vacuum pump connected with the vacuum air pipe. The vacuum air pipe is communicated with the annular cavity through an air outlet hole of the upper die seat, and is used for vacuumizing the glue filling cavity.

10. A process for potting a motor stator assembly using the motor stator assembly potting device as claimed in claim 1, wherein, The method comprises the following steps: Install the glue filling mold and the positioning shaft on the stator assembly and perform air tightness detection; After the air tightness detection is completed, the vacuumizing assembly is started, the glue filling cavity is vacuumized through the air outlet hole of the upper die seat, and the vacuum pressure gauge is used to detect the vacuum degree of the glue filling cavity until the vacuum degree is stable in a target range; After the vacuum degree is stable, the glue liquid supply device is started, the glue liquid is injected into the annular cavity of the upper die seat through the glue filling pipe, firstly flows into the W-shaped structure of the glue filling ring, and then is divided into two lowest points along the inclined surface of the W-shaped structure under the action of gravity and vacuum negative pressure, and is converged at the injection hole at the corner; the glue liquid falls to the side wall of the annular cavity through the circumferentially spaced injection holes, flows into the inner axial groove and the outer axial groove of the stator along the side wall, gradually penetrates and fills the gap between the winding and the stator core; When the filling amount of the glue liquid reaches a preset value, the glue liquid supply device is closed, the glue injection is stopped, the vacuum degree and the glue liquid pressure in the glue filling cavity are maintained, and the pressure maintaining time is set; Move the whole mold into an oven, set curing parameters, and maintain slight vacuum during the period; After the curing is completed, the vacuumizing assembly is closed, dry air is slowly introduced into the glue filling cavity, until the pressure in the cavity is restored to normal pressure, the circumferential connecting piece is loosened, the upper die seat and the positioning shaft are sequentially disassembled, the stator assembly is taken out from the lower die seat, and the residual glue liquid flash on the end surface of the stator is cleaned; Through visual or ultrasonic detection, it is confirmed that there is no air bubble in the winding, no glue defect in the glue layer, and the glue liquid is filled fully, if the requirements are met, the glue filling is determined to be qualified, and the next process is entered; if there is air bubble or glue defect, the cause needs to be analyzed and reworked.

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