Glue pouring device and glue pouring process for motor stator assembly

Abstract

The invention relates to the technical field of stator assembly glue pouring, in particular to a motor stator assembly glue pouring device and a glue pouring process, the motor stator assembly glue pouring device comprises a glue pouring mold, a positioning shaft and a glue pouring ring, the glue pouring mold comprises a lower mold base, an upper mold base and a plurality of connecting pieces; an annular cavity is defined by the outer peripheral surface of the positioning shaft and the inner walls of the lower die holder and the upper die holder, and the annular cavity is communicated with an axial groove of the stator assembly to jointly form a closed glue pouring cavity; the vacuumizing assembly is used for vacuumizing the glue filling cavity; the section of the glue pouring ring is of a W-shaped structure, the highest point in the middle of the glue pouring ring is located over the winding, and the two lowest points correspond to the inner side and the outer side of the winding respectively; a plurality of liquid injection holes are formed in the corners of the two lowest points at intervals in the circumferential direction. Through the W-shaped structure of the glue filling ring, the glue liquid is synchronously filled from the inner side and the outer side of the winding and is matched with immersion type rising, the problems of bubbles and air holes in traditional glue filling are solved, the insulation and heat dissipation performance is guaranteed, and the operation reliability of the motor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of stator assembly glue pouring, and in particular to a motor stator assembly glue pouring device and glue pouring process. Background Art

[0002] During the motor production process, the stator assembly glue potting device is a key equipment for achieving insulation, fixation and performance enhancement of the gap between the stator core and the winding. It achieves the core goals of winding fixation, insulation improvement, heat dissipation optimization and moisture-proof protection by precisely injecting insulating glue (such as epoxy resin glue) into the gap.

[0003] The existing glue pouring device includes a glue pouring template located at both ends of the stator assembly and clamping the stator assembly, and a positioning shaft passing through the center hole of the stator. The glue pouring template located at the bottom is a closed structure, while the glue pouring template located at the top is an open structure. The side walls of the glue pouring template and the positioning shaft are enclosed at both ends of the stator assembly to form an annular convergence cavity. After the glue is injected into the convergence cavity, a part of the glue will gradually penetrate into the interior of the winding and slowly diffuse to the bottom; while the other part of the glue will flow directly and quickly to the lower end of the winding along the internal and external gaps of the winding under the action of gravity.

[0004] However, due to the huge difference in the flow speed of the glue liquid through the infiltration winding and the direct flow, the glue filling in the upper and lower parts of the stator is asynchronous. This asynchrony makes it impossible for the air in the winding gap to be discharged in time with the glue filling, and then bubbles are formed locally (especially in the densely packed winding area), or cavitation is generated in the parts that are not fully filled with glue, resulting in poor insulation and heat dissipation performance of the stator winding, seriously affecting the operating reliability and service life of the motor. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a motor stator assembly glue filling device and glue filling process, which effectively solves the problems in the background technology.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a motor stator assembly glue filling device and glue filling process, comprising: A glue-filling mold, comprising a lower mold base and an upper mold base located at both ends of the stator assembly, and a plurality of connecting parts distributed along the circumference for clamping and fixing the lower mold base and the upper mold base; A positioning shaft is coaxially disposed in the center hole of the stator assembly. The outer peripheral surface of the positioning shaft and the inner walls of the lower die base and the upper die base form an annular cavity. The annular cavity is connected to the axial groove of the stator assembly to form a closed glue pouring cavity. A vacuum pumping assembly is provided on the upper mold base and is used to perform a vacuum treatment on the glue pouring cavity; A glue injection pipe is provided on the upper die base and is used to inject glue into the annular cavity; Wherein, a glue pouring ring is arranged in the annular cavity of the upper die holder, the cross section of the glue pouring ring is W-shaped structure, the 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; A plurality of liquid injection holes are arranged at the corners of the two lowest points of the glue pouring ring in the circumferential direction, the glue liquid falls to the side wall of the annular cavity through the plurality of liquid injection holes, and enters the axial grooves on the inner and outer sides of the winding along the side wall to form a glue injection channel.

[0007] Further, the end surface of the upper die holder and / or the lower die holder 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 the circumferential direction; The gas permeable groove penetrates the outer peripheral surface of the upper die holder and / or the lower die holder outward in the radial direction of the stator assembly.

[0008] Further, the lower die holder and the upper die holder are both provided with a sealing plate between the stator assembly; 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 the circumferential direction through a plurality of connecting pieces, thereby achieving axial fixation of the stator assembly; A plurality of positioning grooves are arranged on the outer peripheral surface of the stator assembly in the circumferential direction, and a plurality of connecting pieces are embedded in the positioning grooves one by one.

[0009] Further, the sealing plate is provided with a flow collection groove corresponding to the heat dissipation groove of the stator assembly, and the flow collection groove is arranged in the axial direction.

[0010] Further, the contact surface of the sealing plate with the upper die holder and the lower die holder is provided with a first convex ring at the inner edge, and the upper die holder and the lower die holder are both provided with a groove for embedding the first convex ring; And a gap is provided at the contact surface of the two sealing plates with the stator assembly at the inner edge; Wherein, a first sealing structure is arranged on both contact surfaces of the sealing plate.

[0011] Further, the glue pouring ring comprises: A liquid blocking platform is arranged at the highest point position; Two flow guide plates are formed by extending downward along the inner and outer edges of the liquid blocking platform; Two limiting plates are formed by extending upward along the bottom edges of the two flow guide plates; Wherein, the free ends of the two limiting plates abut on the side wall of the annular cavity, the area above the intersection position of the flow guide plate and the limiting plate forms a flow guide ring groove, and a plurality of liquid injection holes are distributed equidistantly in the circumferential direction at the bottom of the flow guide ring groove.

[0012] Further, an exhaust ring is arranged above the liquid blocking platform, and a gas collecting cavity is arranged in the exhaust ring; 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, and an exhaust end of the exhaust pipe extends out of the upper mold base and is provided with a micro one-way valve at the extending end.

[0013] Further, one end of the glue filling pipe penetrates through the upper mold base and is in communication 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.

[0014] Further, the vacuum extraction assembly comprises a vacuum extraction pipe, a vacuum pressure gauge mounted on a branch pipe of the vacuum extraction pipe close to the annular cavity, and a vacuum electromagnetic valve and a vacuum pump connected with the vacuum extraction pipe; The vacuum extraction pipe is in communication with the annular cavity through an air extraction hole formed in the upper mold base, and is used for vacuumizing the glue filling cavity.

[0015] 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: The glue filling mold and the positioning shaft are installed on the stator assembly and subjected to air tightness detection; After the air tightness inspection is completed, the vacuum extraction assembly is started, the glue filling cavity is subjected to vacuumizing treatment through the air extraction hole of the upper mold base, and the vacuum pressure gauge is used to display that the vacuum degree in the glue filling cavity is stably in a target range; 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, firstly flows into the W-shaped structure of the glue filling ring; under the action of gravity and vacuum negative pressure, the glue liquid is divided into two lowest points along the inclined surface of the W-shaped structure, 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 inside axial groove and the outside axial groove of the stator along the side wall, and 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, 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; The whole mold is moved into an oven, and curing parameters are set, and a slight vacuum is maintained during the period; After the curing is completed, the vacuum extraction assembly is closed, dry air is slowly introduced into the glue filling cavity, and after the pressure in the cavity is restored to normal pressure, the circumferential connecting piece is loosened, the upper mold base, the positioning shaft are sequentially disassembled, and the stator assembly is taken out from the lower mold base, and the residual glue liquid flash on the stator end face is cleaned. It is confirmed through visual inspection or ultrasonic detection that there is no air bubble in the winding, no glue defect in the glue layer, and the glue liquid is filled fully, and 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 reasons are analyzed and reworked.

[0016] The beneficial effects of the present invention are as follows: through the structural design of the W-shaped glue potting ring in the present invention, the glue is directionally diverted to the gaps inside and outside the winding through the injection holes at the two lowest points, forming an independent and symmetrical glue injection path, ensuring that the glue is filled synchronously from the inside and outside of the winding; the glue rises from bottom to top after converging along the axial groove, thereby avoiding air encapsulation in local areas due to glue accumulation or lag; at the same time, the active exhaust effect of the vacuum component on the closed glue potting cavity further promotes the gradual discharge of air in the winding gap as the glue is filled, fundamentally solving the problems of bubbles and cavitations in traditional glue potting, ensuring the insulation performance of the winding and the integrity of the heat dissipation path, thereby improving the reliability of motor operation.

[0017] The W-shaped glue-potting ring in the present invention utilizes the height difference of its own cross-section to form a natural diversion slope. The glue liquid can be automatically diverted to the target position along the slope under the action of gravity without the need for additional power. At the same time, the evenly distributed injection holes on the glue-potting ring allow the glue liquid to enter the winding gap synchronously from multiple points, avoiding local excessive flow rate or turbulence caused by single-point glue-potting, ensuring smooth glue flow, and greatly improving the consistency of the stator assembly glue-potting quality in mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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 recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the structural assembly of a glue potting device for a motor stator assembly according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structural decomposition of the glue potting device for the motor stator assembly according to an embodiment of the present invention; Figure 3 This is a top view of a glue potting device for a motor stator assembly according to an embodiment of the present invention; Figure 4 for Figure 3 AA section view; Figure 5 for Figure 4 A local enlarged view of point B; Figure 6 This is a cross-sectional view of the glue filling device of the motor stator assembly after glue filling in an embodiment of the present invention; Figure 7 for Figure 6 A partial enlarged view of point C; Figure 8This is a structural diagram and a partial enlarged diagram of the glue potting ring in an embodiment of the present invention; Figure 9 This is a schematic diagram of a sealing plate installed on a stator assembly from a first perspective in an embodiment of the present invention; Figure 10 This is a schematic diagram from a second perspective of the sealing plate installed on the stator assembly in an embodiment of the present invention; Figure 11 Schematic diagram of the installation of the glue-filling mold and the positioning shaft in an embodiment of the present invention; Figure 12 Schematic diagram of the installation of the glue potting ring in an embodiment of the present invention.

[0020] Figure numerals: 10, stator assembly; 10a, winding; 1, glue pouring mold; 11, lower mold base; 11a, air vent; 11b, groove; 12, upper mold base; 13, connector; 2, positioning shaft; 2a, annular cavity; 3, glue pouring ring; 3a, liquid injection hole; 31, liquid blocking platform; 311, exhaust hole; 32, guide plate; 33, limit plate; 34, exhaust ring; 35, exhaust pipe; 4, sealing plate; 41, through hole; 42, confluence groove; 43, first convex ring. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] like Figures 1 to 12 The glue filling device of the motor stator assembly 10 shown includes: The glue-filling 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 along the circumference for clamping and fixing the lower mold base 11 and the upper mold base 12; The positioning shaft 2 is coaxially arranged in the center hole of the stator assembly 10. The two ends of the positioning shaft 2 are sealed and fixed to the lower die base 11 and the upper die base 12 respectively. The outer peripheral surface of the positioning shaft 2 and the inner walls of the lower die base 11 and the upper die base 12 enclose an annular cavity 2a. The annular cavity 2a is connected to the axial groove of the stator assembly 10, together forming a closed glue pouring cavity; A vacuum pumping assembly is provided on the upper mold base 12 and is used to perform vacuum treatment on the glue filling cavity; A glue pouring pipe is provided on the upper die base 12 and is used to inject glue into the annular cavity 2a; A glue potting ring 3 is provided in the annular cavity 2a of the upper die base 12. The cross section of the glue potting ring 3 is a W-shaped structure. 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. Several injection holes 3a are circumferentially spaced at the corners of the two lowest points of the glue-potting ring 3. The glue falls through these holes 3a onto the sidewalls of the annular cavity 2a and enters the inner and outer axial grooves of the winding 10a along the sidewalls, forming a glue injection path. It should be noted that the winding 10a is placed within the annular cavity 2a, forming 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. The two lowest points correspond to the outer and inner annular gaps. Preferably, the connector 13 utilizes a bolt or snap-fit ​​structure, which can provide axial locking force to ensure end-face sealing.

[0025] In the present invention, the stator assembly 10 includes a stator core and a winding 10a. The stator core is formed by stacking silicon steel sheets. A plurality of axial slots are provided in the circumferential direction of the stator core. Each axial slot passes through the two end surfaces of the stator core along the axial direction. The winding 10a is wound by enameled wire, and its main body is embedded in the axial slot, and the two ends of the winding 10a protrude from the two end surfaces of the stator core respectively. The axial slot in which the winding 10a is embedded forms a gap on both the inner and outer sides in the radial direction. The gap is the target area for glue filling. When the glue pouring device is assembled with the stator assembly 10, first, the lower die base 11 is fitted to the lower end face of the stator core, and the upper die base 12 is fitted to the upper end face of the stator core. The outer peripheries of the lower die base 11 and the upper die base 12 are evenly distributed with connecting holes along the circumferential direction. The connecting holes of the upper die base 12 and the lower die base 11 are locked by the connecting piece 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 outer periphery of the lower end of the positioning shaft 2 is provided with an annular sealing groove, and the groove is embedded with a sealing member. The O-ring ensures that the lower end face of the positioning shaft 2 fits tightly against the bottom of the inner cavity of the lower die base 11, achieving double sealing in the radial and axial directions. The outer circumferential surface of the positioning shaft 2, the inner wall of the lower die base 11, and the inner wall of the upper die base 12 form an upper annular cavity 2a on the upper die base 12 side and a lower annular cavity 2a on the lower die base 11 side. The axial groove of the stator core is connected to the upper and lower annular cavities 2a, together forming a closed glue potting cavity, and the two ends of the winding 10a and the inner and outer gaps are all located in the glue potting cavity.

[0026] The glue filling tube is initially closed, and the vacuum assembly is started to vacuum the glue filling chamber so that the vacuum degree in the glue filling chamber reaches the set range and the vacuum state is maintained for 3-5 minutes; the glue filling tube is opened, and the glue is pumped into the annular cavity 2a through the glue filling tube. The outlet of the glue filling tube is opposite to the highest point of the W-shaped structure of the glue filling ring 3. Under the action of gravity and the vacuum environment, the glue is diverted along the W-shaped structure slope of the glue filling ring 3 to the corner position of the two lowest points, and is injected into the gaps on the inside and outside of the winding 10a through the injection holes 3a evenly distributed circumferentially; the glue entering the gap flows downward along the axial groove and converges into the lower annular cavity 2a. As the glue is continuously injected, the liquid level in the glue filling chamber rises steadily, and the winding 10a in the axial groove is immersed from bottom to top. During the rising process of the liquid level, the trace air remaining in the winding 10a is discharged through the upper annular cavity 2a and the vacuum assembly as the liquid level rises, and finally completes the uniform glue filling of the entire winding 10a.

[0027] In the application, through the structural design of the W-shaped glue pouring ring 3, the glue solution is directionally shunted to the gap inside and outside the winding 10a through the two lowest injection holes 3a, forming a glue injection channel, ensuring 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, the air package formed by the glue solution accumulation or lag in the local area is avoided; at the same time, the active exhaust function of the vacuum pumping assembly to the sealed glue pouring cavity further promotes the air in the gap of the winding 10a to be gradually discharged along with the glue filling, solving the problem of air bubbles and air pockets in the traditional glue pouring, ensuring the integrity of the insulation performance and heat dissipation path of the winding 10a, and further improving the operation reliability and service life of the motor.

[0028] In the application, the W-shaped glue pouring ring 3 utilizes the height difference of its own section to form a natural flow guide slope, and the glue solution can be automatically shunted to the target position along the slope under the action of gravity without additional power; at the same time, the evenly distributed injection holes 3a on the glue pouring ring 3 enable the glue solution to enter the winding 10a gap from multiple points synchronously, avoiding the local flow rate being too fast or turbulent caused by single-point glue pouring, ensuring smooth glue solution flow, and greatly improving the consistency of the glue pouring quality of the stator assembly 10 in batch production.

[0029] In the application, the positioning shaft 2 is sealingly fixed with the lower die seat 11 and the upper die seat 12, and the axial groove and the annular cavity 2a are integrated into a sealed glue pouring cavity, in combination with the active reduction of the cavity air pressure by the vacuum pumping assembly, so that the air in the gap of the winding 10a is more easily separated from the glue solution surface 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 un-discharged air in the glue layer are effectively avoided, the close combination of the glue layer with the winding 10a and the core is ensured, and finally the service life of the motor is prolonged.

[0030] In the preferred embodiment of the application, the end surface of the upper die seat 12 and / or the lower die seat 11 facing the stator assembly 10 is provided with a gas permeable groove 11a corresponding to the position of the heat dissipation groove of the stator assembly 10 in the circumferential direction; the gas permeable groove 11a penetrates the outer peripheral surface of the upper die seat 12 and / or the lower die seat 11 outward along the radial direction of the stator assembly 10.

[0031] In the scheme, when the upper die seat 12 and the lower die seat 11 are both provided with the gas permeable groove 11a, the gas permeable groove 11a and the heat dissipation groove jointly form an airflow passage through both ends of the stator assembly 10, quickly conducting heat out 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 seat 12 or only the lower die seat 11 is provided with the gas permeable groove 11a, the gas permeable groove 11a and the heat dissipation groove jointly form a one-way open airflow channel, which effectively prevents dust, moisture and other impurities in the external environment from entering the heat dissipation groove while dissipating heat from the stator assembly 10, especially suitable for scenes with high cleanliness requirements for the stator.

[0032] In the present invention, when the lower die base 11 and the upper die base 12 are in direct contact with the stator assembly 10 and clamped by the connector 13, due to the lack of a circumferential limiting structure, the upper and lower die bases 11 are prone to synchronous rotation during operation. This relative rotation will cause the silicon steel sheets on the stator end face to be rubbed or squeezed, thereby causing deformation or wear, affecting the structural integrity of the stator assembly 10. Therefore, in order to reduce damage to the silicon steel sheets on the stator end face, preferably, a sealing plate 4 is provided between the lower die base 11 and the upper die base 12 and the stator assembly 10; a through hole 41 is provided in the center of the sealing plate 4 for the end of the winding 10a to pass through, and the outer edges of the two sealing plates 4 are clamped in the circumferential direction by a plurality of connectors 13 to achieve axial fixation of the stator assembly 10; a plurality of positioning grooves are provided in the circumferential direction on the outer peripheral surface of the stator assembly 10, and a plurality of connectors 13 are embedded in the positioning grooves in a one-to-one correspondence.

[0033] The closing plate 4 serves as a transition piece between the mold base and the stator assembly 10. Its outer edge is clamped to the mold base through the connecting piece 13, so that the clamping force is evenly transmitted to the stator end face through the closing plate 4, rather than locally concentrated, effectively avoiding deformation of the stator core caused by uneven distribution of clamping force. At the same time, the positioning groove forms a radial limit for the connecting piece 13 to prevent the connecting piece 13 from sliding along the outer periphery of the stator during the clamping process, ensuring the stability of the clamping position and avoiding wear on the stator end face caused by sliding friction.

[0034] On the basis of the above solution, a confluence groove 42 is provided on the sealing plate 4 corresponding to the heat dissipation groove of the stator assembly 10 , and the confluence groove 42 is provided through the axial direction.

[0035] The heat dissipation grooves of the stator are multiple independent channels distributed axially. The trajectory edge of the confluence groove 42 surrounds the ends of multiple heat dissipation grooves, converging the dispersed heat dissipation groove airflow into the confluence groove 42, so that the airflow forms a stable air pressure field in the reflux groove, and then is discharged centrally through the air permeable groove 11a of the mold base, significantly reducing the airflow resistance and improving the exhaust efficiency of hot air.

[0036] In a further preferred embodiment, the contact surfaces between the sealing plate 4 and the upper die base 12 and the lower die base 11 are provided with a first convex ring 43 at the inner edge, and the upper die base 12 and the lower die base 11 are provided with a groove 11b for the first convex ring 43 to be embedded; and the contact surfaces between the two sealing plates 4 and the stator assembly 10 are provided with a gap at the inner edge; and a first sealing structure is provided on both contact surfaces of the sealing plates 4.

[0037] The first convex ring 43 and the groove 11b are embedded in each other to form a labyrinth seal, and the outer peripheral surface of the first convex ring 43 is tightly fitted with the inner wall of the groove 11b, which extends the path for the glue to overflow and increases resistance. A first sealing structure is added to the end face of the sealing plate 4, located outside the first convex ring 43, to further eliminate the gap through interference fit, effectively blocking the leakage of glue to the outside of the mold base; and the gap reserved on the contact surface between the sealing plate 4 and 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 achieve flexible deformation at the gap, thereby improving the tightness of the fit with the stator end face and playing the role of sealing the glue filling cavity. Preferably, the first sealing structure adopts an O-ring, but is not limited to the above-mentioned sealing structure.

[0038] The glue filling ring 3 of the present invention includes a liquid retaining platform 31, two guide plates 32 and two limit plates 33. The liquid retaining platform 31 is set at the highest point; the two guide plates 32 are formed by extending downward along the inner and outer edges of the liquid retaining platform 31; and the two limit plates 33 are formed by folding upward and extending along the bottom edges of the two guide plates 32. Among them, the free ends of the two limit plates 33 abut against the side wall of the annular cavity 2a, and the guide plate 32 and the limit plate 33 are located in the upper area of ​​the intersection position to form a guide ring groove, and a number of injection holes 3a are evenly distributed at the bottom of the guide ring groove along the circumferential direction.

[0039] Specifically, the liquid-blocking platform 31 is an annular flat plate structure for receiving the glue injected from the glue filling tube. The guide plate 32 is a conical cylinder structure. The guide plate 32 located at the inner edge is an inverted conical structure, and the guide plate 32 located at the outer edge is a right conical structure. The taper of the two conical guide plates 32 is the same, and the limit plate 33 is folded upward and extended along the bottom edge of the inner guide plate 32 and the outer guide plate 32 respectively, away from the free end of the side of the guide plate 32, and abuts against the side wall of the annular cavity 2a through interference fit, that is, the inner limit plate 33 abuts the outer periphery of the positioning shaft 2, and the outer limit plate 33 abuts against the inner wall of the upper mold base 12, thereby realizing radial positioning of the glue filling ring 3. It should be noted that the inclination angles of the two guide plates 32 and the two limit plates 33 are determined according to the spacing of the annular grooves, so that the limit plates 33 abut against the side walls of the annular cavity 2a, ensuring that the glue ring 3 does not undergo radial displacement under the impact of the glue and in a vacuum environment, thereby ensuring the alignment accuracy of the gap between the injection hole 3a and the winding 10a.

[0040] After the glue is injected from the glue filling pipe, it first falls to the top surface of the liquid blocking platform 31. Since the liquid blocking platform 31 is set horizontally, the glue spreads to the surroundings under the action of gravity, flows downward along the inclined surfaces of the inner and outer guide plates 32, and is blocked by the limiting plate 33 and then converges in the guide ring groove; when the glue level in the ring groove exceeds the height of the injection holes 3a, the glue is discharged simultaneously through the injection holes 3a distributed at equal intervals and injected into the gaps inside and outside the winding 10a respectively, thereby realizing uniform diversion and directional introduction of the glue.

[0041] In the present application, when the glue solution is injected into the annular cavity 2a above, a small amount of air will be brought into the glue filling cavity along with the glue solution. During the process of the glue solution flowing along the transverse 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 incomplete filling of the glue solution. Therefore, in order to solve the problem of gas retention in the glue filling ring 3 area, 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 die seat 12, and a micro one-way valve is arranged at the extending end (not shown in the figure).

[0042] The exhaust pipe 35 continuously discharges gas from the glue filling cavity, ensuring that the gas collecting cavity is always in a low pressure state, maintaining the continuous capture 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 filling cavity, avoiding the disturbance of the glue solution flow caused by the local air pressure difference, and ensuring the smooth distribution of the glue solution along the flow guide plate 32.

[0043] 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 insufficient coverage of traditional vacuum exhaust in the local area of the glue filling ring 3; and the micro one-way valve can further improve the exhaust reliability of the glue filling process by responding to the pressure difference change while ensuring the exhaust efficiency, and further reducing the risk of bubble defects.

[0044] The one-way valve adopts 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. When the vacuum degree of the glue filling space fluctuates, it can ensure quick response. When the air pressure in the glue filling space is lower than the outside, the valve core is automatically closed by the spring force or its own gravity; when the internal air is discharged, the micro air pressure difference can drive the valve core to open.

[0045] In the present application, one end of the glue filling pipe penetrates through the upper die seat 12 and communicates with the annular cavity 2a, and the other end is used to connect the glue solution supply device (not shown in the figure) to inject glue solution into the annular cavity 2a.

[0046] Specifically, the glue solution supply device includes a glue storage tank, a gear pump, and 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 solution in real time, and a glue replenishment 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.

[0047] The glue liquid enters the variable frequency gear pump from the glue storage tank through the filter. After being pressurized, it passes through the one-way valve, electromagnetic flow sensor, and proportional control valve in sequence, and is finally 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. The signals of both are transmitted to the PLC control unit. The PLC control unit stabilizes the flow and pressure within the target range by adjusting the gear pump speed and the proportional control valve opening, thereby achieving precise control of the glue liquid supply.

[0048] The present invention can automatically adapt to the situation in which the cavity pressure is low in the initial stage and the full glue pressure is high in the later stage during the glue filling process in the annular cavity 2a through the linkage control of pressure and flow, thereby avoiding flow fluctuations caused by untimely manual adjustment.

[0049] In the present invention, the vacuum pumping assembly (not shown in the figure) includes a vacuum pumping pipe, a vacuum pressure gauge installed on a branch pipe of the vacuum pumping pipe close to the annular cavity 2a, and a vacuum solenoid valve and a vacuum pump connected to the vacuum pumping pipe; the vacuum pumping pipe is connected to the annular cavity 2a through a pumping hole opened in the upper mold base 12, and is used to vacuum the glue pouring cavity.

[0050] During the specific implementation process, the PLC issues a command, the vacuum solenoid valve is powered on and turned 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 the signal to the PLC: if the vacuum degree does not reach the target, the PLC maintains the vacuum pump at full speed and continues to pump air; if the vacuum degree reaches the target range, the PLC controls the vacuum pump to slow down to avoid energy waste caused by excessive pumping; when the vacuum degree in the annular cavity 2a is stable in the target range and maintained for the preset time, the PLC links the glue supply device to start glue filling; during the glue filling process, the vacuum component continues to operate: the small amount of air entrained when the glue is injected will quickly move to the exhaust hole under the action of negative pressure and be extracted, and the vacuum pressure gauge monitors the vacuum degree fluctuations caused by the glue filling in real time, and the PLC maintains the vacuum degree stable by fine-tuning the vacuum pump power; after the glue filling is completed, the PLC first closes the vacuum solenoid valve, cuts off the exhaust passage, and then stops the vacuum pump.

[0051] In this invention, a vacuum pump is controlled by a PLC control unit, which evacuates the glue potting chamber, reducing the pressure within the chamber. This allows air and volatiles contained in the glue to be extracted under negative pressure, preventing the formation of bubbles after the glue solidifies. This ensures the insulation performance, structural strength, and heat dissipation of the motor stator after glue potting. The PLC also controls the vacuum pump and glue supply, preventing premature glue potting due to insufficient vacuum or wasting energy due to excessive vacuuming, thereby improving process stability.

[0052] The present invention also provides a motor stator assembly glue pouring process, which is applied to a motor stator assembly glue pouring device and includes the following steps: Install the glue-filling mold 1 and the positioning shaft 2 onto the stator assembly 10 and perform an airtightness test; After completing the airtightness check, turn on the vacuum assembly and vacuum the glue filling cavity through the vacuum hole of the upper mold base 12 until the vacuum pressure gauge shows that the vacuum degree in the glue filling cavity is stable within the target range; ensure that the air in the glue filling cavity is fully exhausted to create a low-pressure environment for subsequent glue filling.

[0053] After the vacuum level stabilizes, the glue supply device is activated. Glue is injected into the annular cavity 2a of the upper die holder 12 through the glue injection pipe, first flowing into the W-shaped structure of the glue injection ring 3. Under the action of gravity and vacuum negative pressure, the glue flows along the inclined surface of the W-shaped structure to two lowest points and converges at the injection hole 3a at the corner. The glue falls to the side wall of the annular cavity 2a through the circumferentially spaced injection holes 3a, flows along the side wall into the inner and outer axial slots of the stator, and gradually penetrates and fills the gap between the winding 10a and the stator core. When the glue filling volume reaches the preset value, the glue supply device is turned off and glue injection is stopped; the vacuum degree and glue pressure in the glue filling chamber are maintained for the set time; ensuring that the glue fully penetrates into the fine gaps of the winding 10a to reduce residual bubbles; The entire mold is moved into an oven, and curing parameters are set, while maintaining a slight vacuum during the process to prevent the formation of bubbles from trace gases released during the curing of the glue, while promoting the tightness of the bonding between the glue and the winding 10a.

[0054] After curing is completed, close the vacuum assembly and slowly introduce dry air into the glue pouring chamber to avoid sudden pressure changes that may cause cracking of the glue layer. After the pressure in the cavity returns to normal pressure, loosen the circumferential connector 13, disassemble the upper mold base 12 and the positioning shaft 2 in sequence, remove the stator assembly 10 from the lower mold base 11, and clean the glue flash remaining on the stator end surface. Through visual or ultrasonic testing, confirm that there are no bubbles in the winding 10a, the glue layer is not missing glue, and the glue is fully filled. If the above requirements are met, the glue filling is considered qualified and enter the next process; if there are bubbles or glue missing, the cause needs to be analyzed and reworked.

[0055] Through the directional diversion design of the W-shaped glue potting ring 3, combined with negative pressure filling in a vacuum environment, the glue is evenly distributed along the inner and outer axial grooves of the winding 10a, solving the problems of glue shortage and bubble residue on the inner side in traditional glue potting. At the same time, the sealing structure of the mold and the positioning shaft 2 ensures that the glue flows only in the preset glue potting cavity, thereby improving the consistency and reliability of the stator glue potting.

[0056] Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A glue filling device for a motor stator assembly, characterized in that: include: A glue-filling mold, comprising a lower mold base and an upper mold base located at both ends of the stator assembly, and a plurality of connecting parts distributed along the circumference for clamping and fixing the lower mold base and the upper mold base; A positioning shaft is coaxially disposed in the center hole of the stator assembly. The outer peripheral surface of the positioning shaft and the inner walls of the lower die base and the upper die base form an annular cavity. The annular cavity is connected to the axial groove of the stator assembly to form a closed glue pouring cavity. A vacuum pumping assembly is provided on the upper mold base and is used to perform a vacuum treatment on the glue pouring cavity; A glue injection pipe is provided on the upper die base and is used to inject glue into the annular cavity; A glue-filling ring is provided in the annular cavity of the upper die seat, and the cross-section of the glue-filling ring is a W-shaped structure. The highest point in the middle of the W-shaped structure is located directly above the winding of the stator assembly, and the two lowest points correspond to the inner and outer sides of the winding respectively. A plurality of injection holes are arranged at intervals along the circumference at the corners of the two lowest points of the glue pouring ring. The glue falls to the side wall of the annular cavity through the plurality of injection holes and enters the inner and outer axial grooves of the winding along the side wall to form a glue injection path.

2. The motor stator assembly glue pouring device according to claim 1, characterized in that: The upper die base and / or the lower die base are provided with ventilation grooves on the end surfaces facing the stator assembly at positions corresponding to the heat dissipation grooves of the stator assembly along the circumferential direction; The air-permeable groove passes through the outer circumferential surface of the upper die base and / or the lower die base toward the outside in the radial direction of the stator assembly.

3. The motor stator assembly glue pouring device according to claim 1, characterized in that: A sealing plate is provided between the lower die base, the upper die base and the stator assembly; A through hole is provided at the center of the sealing plate for the winding end to pass through, and the outer edges of the two sealing plates are clamped together along the circumferential direction by a plurality of the connecting members to achieve axial fixation of the stator assembly; A plurality of positioning grooves are provided on the outer peripheral surface of the stator assembly along the circumferential direction, and the plurality of connecting members are embedded in the positioning grooves in a one-to-one correspondence.

4. The motor stator assembly glue pouring device according to claim 3, characterized in that: The sealing plate is provided with a confluence groove corresponding to the heat dissipation groove of the stator assembly, and the confluence groove is arranged to penetrate along the axial direction.

5. The motor stator assembly glue pouring device according to claim 3, characterized in that: A first convex ring is provided at the inner edge of the contact surface between the sealing plate and the upper die base and the lower die base, and a groove for the first convex ring to be embedded in is provided on both the upper die base and the lower die base; A gap is provided at the inner edge of the contact surface between the two sealing plates and the stator assembly; Wherein, a first sealing structure is provided on both contact surfaces of the sealing plate.

6. The motor stator assembly glue pouring device according to claim 1, characterized in that: The glue pouring ring comprises: The liquid blocking platform is set at the highest point; Two guide plates are formed by extending downwardly along the inner and outer edges of the liquid retaining platform; Two limiting plates are formed by folding and extending upward along the bottom edges of the two guide plates; Among them, the free ends of the two limit plates abut against the side walls of the annular cavity, and the guide plate and the limit plate are located in the upper area of ​​the intersection position to form a guide ring groove, and several injection holes are evenly spaced along the circumferential direction at the bottom of the guide ring groove.

7. The motor stator assembly glue pouring device according to claim 6, characterized in that: An exhaust ring is provided above the liquid retaining platform, and an air collecting cavity is provided in the exhaust ring; The liquid blocking platform is provided with a plurality of exhaust holes communicated with the gas collecting cavity, and an exhaust pipe is provided on the exhaust ring. The exhaust end of the exhaust pipe extends out of the upper die seat, and a micro one-way valve is provided at the extended end.

8. The motor stator assembly glue pouring device according to claim 1, characterized in that: One end of the glue pouring tube passes through the upper mold base and is connected to the annular cavity, and the other end is used to connect to the glue supply device to inject glue into the annular cavity.

9. The motor stator assembly glue pouring device according to claim 1, characterized in that: The vacuum pumping assembly includes a vacuum pumping pipe, a vacuum pressure gauge installed on a branch pipe of the vacuum pumping pipe close to the annular cavity, and a vacuum solenoid valve and a vacuum pump connected to the vacuum pumping pipe; The vacuum exhaust pipe is connected to the annular cavity through an exhaust hole provided in the upper mold base, and is used for performing vacuum treatment on the glue pouring cavity.

10. A motor stator assembly glue pouring process, using the motor stator assembly glue pouring device according to claim 1, characterized in that: The following steps are involved: Install the glue-filling mold and positioning shaft onto the stator assembly and perform an airtightness test; After completing the airtightness check, turn on the vacuum assembly and evacuate the glue filling cavity through the vacuum hole of the upper mold base until the vacuum pressure gauge shows that the vacuum degree in the glue filling cavity is stable within the target range; After the vacuum level stabilizes, the glue supply device is activated. Glue is injected into the annular cavity of the upper die holder through the glue injection pipe, first flowing into the W-shaped structure of the glue injection ring. Under the action of gravity and vacuum negative pressure, the glue flows along the inclined surface of the W-shaped structure to the two lowest points and converges at the injection holes at the corners. The glue falls to the side walls of the annular cavity through the injection holes spaced circumferentially, and flows along the side walls into the inner and outer axial slots of the stator, gradually penetrating and filling the gap between the winding and the stator core. When the glue filling volume reaches the preset value, the glue supply device is turned off and glue injection is stopped; the vacuum degree and glue pressure in the glue filling chamber are maintained for the set time; Move the entire mold into the oven, set the curing parameters, and maintain a slight vacuum during the process; After curing is completed, close the vacuum assembly and slowly introduce dry air into the glue pouring cavity until the pressure in the cavity returns to normal pressure. Then loosen the circumferential connector, disassemble the upper die base and positioning shaft in turn, remove the stator assembly from the lower die base, and clean the glue flash remaining on the stator end face. Through visual or ultrasonic testing, confirm that there are no bubbles in the winding, the glue layer is not missing, and the glue is fully filled. If the requirements are met, the glue filling is considered qualified and enter the next process. If there are bubbles or glue missing, the cause needs to be analyzed and reworked.

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