Outgoing line protection assembly and motor

Abstract

The invention provides an outgoing line protection assembly and a motor. The outgoing line protection assembly is used for protecting a lead-out wire of a motor stator, and comprises an outgoing line sheath which comprises an electric insulation part made of an insulation material, and the electric insulation part is arranged in the motor and located at a wire welding position on the stator; a groove of a blind hole structure is formed in the side wall, facing the wire welding position, of the electricity insulation part, and the groove covers the wire welding position. According to the invention, the electric insulation part is arranged on the traditional outgoing line protection device, the welding point on the stator is covered, the voltage resistance and insulation of the motor end cover and the welding point are ensured, an electric insulation ring structure is not needed, the operation is reduced, the assembly efficiency is improved, and the cost is reduced.

Description

Technical Field

[0001] The present application belongs to the field of motor technology, and specifically relates to an outlet protection component and a motor. Background Art

[0002] With the impact of energy efficiency upgrades, the use of brushless DC motors has increased, their application areas have expanded to various fields, the operating environment has become more demanding, and the requirements for motors have become more stringent.

[0003] At present, the existing brushless DC motor adopts injection molding + stretching end cover structure. The stator assembly is formed into a skirt shape by injection molding, and the end cover is formed by stretching. The end cover groove and the stator assembly skirt are tightly matched to achieve motor sealing. The motor insulation level requirements are relatively high. The withstand voltage is one of the key factors in determining the insulation level. The electrical clearance distance is required to meet the condition of not less than 2.5mm. The withstand voltage of the plastic-sealed motor is poor, which is usually caused by the insufficient distance between the end cover and the welding point.

[0004] The conventional solution is to add an isolating ring that matches the injection molded stator to prevent poor withstand voltage. The shape of the isolating ring is basically the same as the internal skirt structure of the injection molded stator. The isolating ring is placed between the welding terminal and the end cover, fully meshing with the internal skirt of the stator to separate them. Placing the outlet sheath and isolating ring requires the use of multiple positions of personnel, which is a large investment. Summary of the invention

[0005] Therefore, the present application provides an outgoing line protection assembly and a motor, which can solve the problems of troublesome operation and large investment in assembling the isolation ring in the prior art.

[0006] In order to solve the above problems, the present application provides an outlet wire protection assembly for protecting the stator lead wires of a motor, comprising:

[0007] The outlet wire sheath comprises an insulating portion made of an insulating material, wherein the insulating portion is arranged inside the motor and located at a position where the wires are welded on the stator;

[0008] A groove with a blind hole structure is provided on the side wall of the electric isolation portion facing the wire welding position, and the groove covers the wire welding position.

[0009] In some embodiments,

[0010] The wire welding position includes a power line welding position and a capacitor pin welding position, and the grooves are correspondingly provided with at least two: a first groove and a second groove, the first groove covers the power line welding position, and the second groove covers the capacitor pin welding position.

[0011] In some embodiments,

[0012] The electric isolation portion is configured to be arc-shaped, and the first groove is configured to have an opening on the inner wall of the electric isolation portion for leading out the power line on the power line welding position.

[0013] In some embodiments,

[0014] A wire outlet hole is also provided on the inner wall of the electric isolation part, and the wire outlet hole passes through the electric isolation part; the wire is led out to the outside of the motor through the wire outlet hole.

[0015] In some embodiments,

[0016] Along the circumferential direction of the electric isolation portion, a side of the opening facing the wire outlet hole is configured as a transitional arc surface structure.

[0017] In some embodiments,

[0018] An avoidance groove is provided on the inner wall of the stator shell at the wire welding position, and a protrusion corresponding to the position of the avoidance groove is provided on the outer wall of the electric isolation part, and the protrusion is matched and inserted into the avoidance groove.

[0019] In some embodiments,

[0020] The shell of the stator is provided with a notch at the position of the outlet hole, and the outlet sheath also includes a sealing part matching the size of the notch, the sealing part is arranged in the notch, and the outlet hole passes through the sealing part; the electrical isolation part is connected to one side of the sealing part.

[0021] In some embodiments,

[0022] The blocking portion is provided with a protrusion protruding from the rotor end surface along the axial direction of the stator, and the protrusion is configured in a step shape with a high middle portion and low sides.

[0023] According to another aspect of the present application, a motor is provided, comprising the outgoing line protection assembly as described above.

[0024] In some embodiments,

[0025] The motor further comprises an end cover, which is buckled on one end of the stator, and the electric isolation part is sealed between the end cover and the stator.

[0026] The present application provides an output wire protection assembly for protecting the output wires of a motor stator, comprising: an output wire sheath, comprising an insulating portion made of an insulating material, the insulating portion being arranged inside the motor and located at a wire welding position on the stator; a groove with a blind hole structure being provided on the side wall of the insulating portion facing the wire welding position, the groove covering the wire welding position.

[0027] This application has the following beneficial effects:

[0028] By setting an isolating part on the traditional outgoing line protection device and covering the welding points on the stator, the voltage-resistant insulation of the motor end cover and the welding points is ensured. There is no need to set an isolating ring structure, which reduces operations, improves assembly efficiency and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the implementation methods or the prior art descriptions. The drawings described below are merely exemplary, and for those of ordinary skill in the art, other implementation drawings can be derived from the provided drawings without creative work.

[0030] Figure 1 This is a schematic diagram of the structure of the outgoing line protection assembly of an embodiment of the present application;

[0031] Figure 2 For the embodiment of this application Figure 1 Middle partial enlarged picture;

[0032] Figure 3 For the embodiment of this application Figure 1 Schematic diagram from another perspective;

[0033] Figure 4 This is a schematic diagram of the exploded structure of the motor according to an embodiment of the present application;

[0034] Figure 5 This is a schematic diagram of the structure of the outlet sheath of an embodiment of the present application;

[0035] Figure 6 For the embodiment of this application Figure 5 Another perspective diagram of the outlet sheath;

[0036] Figure 7 A schematic diagram of the external structure of a motor according to an embodiment of the present application;

[0037] Figure 8 For the embodiment of this application Figure 7 Schematic diagram from another perspective;

[0038] Fig. 9 A three-dimensional schematic diagram of a motor according to an embodiment of the present application;

[0039] Fig.10 This is a schematic diagram of the structure of the end cover of an embodiment of the present application;

[0040] Fig.11 For the embodiment of this application Fig.10 Schematic diagram from another perspective.

[0041] The reference numerals are:

[0042] 1. Shell; 11. Avoidance groove;

[0043] 2. Outlet sheath; 21. Electric isolation part; 211. Protrusion; 212. Opening; 2121. Transition arc surface; 213. Outlet hole; 214. Second groove; 215. First groove; 22. Blocking part;

[0044] 3. End cover; 31. Ring groove. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0047] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0048] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0049] See also Figures 1 to 11 As shown, according to an embodiment of the present application, an outlet protection assembly is used for protecting the stator lead wires of a motor, comprising:

[0050] The outlet sheath 2 includes an insulating portion 21 made of insulating material, and the insulating portion 21 is arranged inside the motor and located at the wire welding position on the stator;

[0051] A groove with a blind hole structure is provided on the side wall of the electric isolation portion 21 facing the wire welding position, and the groove covers the wire welding position.

[0052] The present application sets an isolation part 21 on the traditional outgoing line protection device to cover the welding points on the stator, thereby ensuring the voltage-resistant insulation of the motor end cover 3 and the welding points. There is no need to set an isolation ring structure, which reduces operations, improves assembly efficiency and reduces costs.

[0053] The present application combines the isolation part 21 with the traditional outgoing line protection device, simplifies the structure of the two components of the traditional outgoing line protection device and the isolation ring, and can effectively cover the welding points on the stator. Combined with the isolation part 21 itself being made of insulating material, although the distance between the end cover 3 and the stator welding point is not increased, the direct conductive path between the two is isolated, which is equivalent to increasing the pressure resistance of the end cover 3 and the stator welding point.

[0054] Since the electric isolation part 21 and the traditional outgoing line protection device are combined into the outgoing line sheath 2 of the present application, the structure is relatively simplified, and the operation during the assembly process is more convenient, quick and efficient.

[0055] In some embodiments,

[0056] The wire welding position includes a power line welding position and a capacitor pin welding position, and the grooves are correspondingly provided with at least two: a first groove 215 and a second groove 214, the first groove 215 covers the power line welding position, and the second groove 214 covers the capacitor pin welding position.

[0057] For the welding points on the stator, including the U, V, and W welding points of the three-phase power supply and the welding point of the Y capacitor end, the corresponding grooves set on the isolation part 21 are also respectively provided with a first groove 215 and a second groove 214 to cover the four welding point positions.

[0058] In some embodiments,

[0059] The electric isolation portion 21 is configured to be arc-shaped, and the first groove 215 is configured to have an opening 212 on the inner wall of the electric isolation portion 21 for leading out the power line at the power line welding position.

[0060] Since the power welding point needs an external power line, the present application sets an opening 212 on the side wall of the first groove 215 covering the welding point of the three phases U, V, and W, which can facilitate the outlet of the welding line; while the second groove 214 does not need to be set with a side wall opening 212.

[0061] The external drive motor does not need to be connected to the Y capacitor pin. At present, many motors are equipped with Y capacitor pins for compatibility with both driven and non-driven motors. This structure can completely seal the Y capacitor pin. This structure can cover all parts that may cause electrical risks with the end cover 3, effectively replacing the electrical insulation function of the isolation ring, greatly improving its safety.

[0062] In some embodiments,

[0063] A wire outlet hole 213 is further provided on the inner wall of the electric isolation portion 21 , and the wire outlet hole 213 penetrates the electric isolation portion 21 ; the wire is led out to the outside of the motor through the wire outlet hole 213 .

[0064] A wire outlet hole 213 is provided on the inner wall of the insulating part 21, which is convenient for guiding the power cord to pass through the motor; a fillet with a radius of 1 mm is provided on the inner side of the wire outlet hole 213 to facilitate the outlet of the power cord. The height of the wire outlet hole 213 is 2 mm and the width is 11 mm. The power cord of the 89 series cabinet machine generally adopts UL1430 22AWG, and the diameter of the wire gauge is about 1.5 mm. When the power cord exits from the wire outlet hole 213, the gap inside is small.

[0065] In some embodiments,

[0066] Along the circumferential direction of the electric isolation portion 21 , a side of the opening 212 facing the wire outlet hole 213 is configured as a transition arc surface 2121 structure.

[0067] Inside the motor, the power cord is led from the opening 212 on the side wall of the first groove 215 of the insulating portion 21 to the wire outlet hole 213. The power cord is welded to the power cord welding position and is output from the opening 212. A certain size of fillet is set on the side wall of the opening 212 facing the wire outlet hole 213 to facilitate the output of the power cord without damaging the wire.

[0068] In some embodiments,

[0069] An avoidance groove 11 is provided on the inner wall of the stator housing 1 at the wire welding position, and a protrusion 211 corresponding to the position of the avoidance groove 11 is provided on the outer wall of the electric isolation part 21 , and the protrusion 211 is matched and inserted into the avoidance groove 11 .

[0070] Based on the fact that a wire welding position is provided in the stator housing 1, a avoidance groove 11 is usually provided on the inner wall of the housing 1 for ease of operation. The wall thickness of the housing 1 at this position is relatively small, and sealing problems are prone to occur. The present application adopts an insulating portion 21 and a protrusion 211 is provided on the outer wall corresponding to the position of the avoidance groove 11. The protrusion 211 fits tightly with the avoidance groove 11, so that the outer peripheral surface of the protrusion 211 of the insulating portion 21 is completely fitted with the inner wall of the housing 1, thereby increasing its sealing and waterproof performance and improving the service life of the motor.

[0071] In some embodiments,

[0072] The stator shell 1 is provided with a notch at the outlet hole 213, and the outlet sheath 2 also includes a sealing portion 22 matching the size of the notch, the sealing portion 22 is provided in the notch, and the outlet hole 213 passes through the sealing portion 22; the electrical isolation portion 21 is connected to one side of the sealing portion 22.

[0073] A notch is provided on the side wall of the stator housing 1 at the position of the wire outlet hole 213 to facilitate the insertion of the power cord. However, there is also a sealing problem in the traditional structure. The wire outlet sheath 2 of the present application adopts a sealing portion 22 matching the size of the notch to seal the notch. At the same time, the insulating portion 21 and the sealing portion 22 are a fixedly connected combined structure, which simplifies the structure and facilitates installation.

[0074] In some embodiments,

[0075] The blocking portion 22 is provided with a protrusion protruding from the rotor end surface along the stator axis, and the protrusion is configured in a step shape with a high middle portion and low sides.

[0076] As for the sealing part 22, since the outlet hole 213 is arranged therein, in order to improve the sealing performance, the sealing part 22 is provided with a protrusion protruding from the rotor end face along the stator axis. When the stator housing 1 and the end cover 3 are assembled, when the end cover 3 is closed and subjected to force, the groove of the end cover 3 will squeeze the protrusion, and a part of the force will be squeezed downward, which will squeeze the gap of the outlet hole 213 below, making it a sealed state. While squeezing, the sealing part 22 will not only be squeezed downward, but also squeezed around, so that it will form an "I" shape, and more closely fit the inner and outer sides of the skirt of the injection-molded stator, and achieve a sealing and waterproof effect by squeezing the shock-absorbing rubber ring.

[0077] The sealing portion 22 and the electric isolation portion 21 are both made of rubber-like insulating materials.

[0078] The wire protection assembly of the present application combines the functions of the traditional wire clamp and the isolating ring, and through tight cooperation with the stator assembly and the end cover 3, it not only realizes the function of sealing and waterproofing, but also meets the requirements of electrical insulation, and increases the application field and use environment of the motor. At the same time, in the production process, it can reduce the number of posts to install isolating rings, save costs, and improve production efficiency.

[0079] According to another aspect of the present application, a motor is provided, comprising the outgoing line protection assembly as described above.

[0080] In some embodiments,

[0081] The motor further comprises an end cover 3 , which is buckled onto one end of the stator, and the electric isolation portion 21 is sealed between the end cover 3 and the stator.

[0082] The general structure of the external drive DC brushless motor includes the end cover 3, injection molded stator, rotor and outlet clamp, wherein the end cover 3 and the injection molded stator are inlaid and installed through the inner cavity concave surface of the end cover 3 and the injection molded stator boss, the outlet clamp is placed at the notch of the injection molded stator and is sealed synchronously with the end cover 3, and the power line is connected from the outlet clamp. Due to the influence of the production and use environment, the end cover 3 and the injection molded stator of the existing structure are tightly matched, which cannot be used in a demanding environment. In order to meet this waterproof requirement, the conventional solution usually adopts a gluing process, but the gluing process is difficult to operate, the glue drying time is long, time-consuming, and the consistency cannot be strictly controlled; in addition, the current external drive plastic sealed motor has the risk of poor voltage resistance, and it is necessary to add an insulating ring on the inside of the injection molded stator to separate the end cover 3 from the welding terminal for insulation.

[0083] Traditional outgoing line protection devices usually use hard PA66 material, and the combination of injection molding and stretching end caps 3 creates gaps between the outgoing line sheaths 2, which makes it easy for water to enter when used in harsh application environments (such as IPX5), resulting in product defects. The conventional solution is to apply glue to the outgoing line sheath 2, but the gluing process is time-consuming, has low production efficiency, and consistency cannot be fully guaranteed.

[0084] When the end cover 3 and the stator housing 1 are sealed and assembled, the insulating part 21 is limited to be 0.5mm higher than the skirt of the stator housing 1, and the sealing part 22 corresponding to the outlet hole 213 is 1mm higher than the skirt of the stator housing 1 to form a stepped surface, and the place where the outlet sheath 2 contacts with the inner and outer rings of the end cover 3 is also correspondingly 1mm higher. Under the great pressure of closing the end cover 3, the raised part of the outlet sheath 2 will be compressed to be flush with the height of the skirt, the gap of the outlet hole 213 will be compressed and sealed, and the outer part of the outlet sheath 2 will be fully meshed with the injection molded stator, thereby improving the sealing and waterproof performance of the product and increasing the service life of the motor.

[0085] The present application combines a waterproof structure with an electrical insulation structure to form a rubber-type wire outlet sheath 2, which replaces the isolating ring component. The current national standard electrical clearance of electric motors is 2.5mm. The current conventional electrical insulation method is to add an isolating ring for insulation. When installed, the structure is tightly attached to the edge inside the stator assembly, and 4 protrusions 211 are added to be tightly attached to the avoidance groove 11 of the stator assembly. The distance between the inner ring of the end cover 3 and the groove is 4mm. When the integrated wire outlet sheath 2 is fully installed with the stator assembly, the distance between the upper end face of the wire outlet sheath 2 and the skirt is 3mm, which is 1mm smaller than the compression distance of the end cover 3, so that when the end cover 3 is closed, the inner ring groove 31 can squeeze the upper end face of the wire outlet sheath 2, combined with the compression between the wire clamp part and the stator assembly and the end cover 3, the wire outlet sheath 2 is firmly and reliably installed and cannot be pulled.

[0086] The integrated outlet sheath 2 structural design combines the waterproof function of the outlet clamp with the electrical insulation function of the isolating ring. It uses rubber materials, and the contact point of the end cover 3 is 0.5mm higher than the skirt of the injection-molded stator, and the upper part of the middle outlet hole 213 is 1mm higher than the injection-molded stator, forming a stepped surface. The place where the outlet sheath 2 contacts the inner and outer rings of the end cover 3 is also 1mm higher. When the motor cover is closed, the outlet sheath 2 can be effectively compressed under great pressure, especially the protrusion 211 of the outlet sheath 2. The higher part is under the pressure. The gap of the outlet hole 213 will be squeezed down to make it a sealed state, thereby achieving a waterproof effect; the integrated outlet sheath 2 structural design has a circular convex groove structure on both sides, which can completely fit the four welding points of U, V, W and Y capacitor ends, and U, V, W are provided with opening 212 arc holes to facilitate the outlet of welding wires. At the same time, the circular convex groove structure is 1mm higher than the inner side of the end height, which can better engage and compress with the end cover 3 to prevent the loosening of the outlet sheath 2. The rubber outlet sheath 2 is used to separate the end cover 3 from the welding point, thereby achieving the effect of withstand voltage insulation. The integrated outlet sheath 2 structural design realizes the integration of the outlet clamp and the isolation ring, which can reduce the number of personnel in related positions, improve efficiency and reduce costs.

[0087] It is easy for those skilled in the art to understand that the above-mentioned implementation modes can be freely combined and superimposed without conflict.

[0088] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. An outlet protection assembly, used for protecting the stator lead wires of a motor, characterized in that: include: The outlet wire sheath (2) comprises an insulating portion (21) made of insulating material, wherein the insulating portion (21) is arranged inside the motor and located at a wire welding position on the stator; A groove with a blind hole structure is provided on the side wall of the electric isolation portion (21) facing the wire welding position, and the groove covers the wire welding position.

2. The outgoing line protection assembly according to claim 1, characterized in that: The wire welding position includes a power line welding position and a capacitor pin welding position, and the grooves are correspondingly provided with at least two: a first groove (215) and a second groove (214), the first groove (215) is buckled on the power line welding position, and the second groove (214) is buckled on the capacitor pin welding position.

3. The outgoing line protection assembly according to claim 1 or 2, characterized in that: The electric isolation portion (21) is configured to be arc-shaped, and the first groove (215) is provided with an opening (212) on the inner wall of the electric isolation portion (21) for leading out the power line at the power line welding position.

4. The outgoing line protection assembly according to claim 3, characterized in that: A wire outlet hole (213) is also provided on the inner wall of the electric isolation portion (21), and the wire outlet hole (213) passes through the electric isolation portion (21); the wire is led out to the outside of the motor through the wire outlet hole (213).

5. The outgoing line protection assembly according to claim 4, characterized in that: Along the circumferential direction of the electric isolation portion (21), a side of the opening (212) facing the wire outlet hole (213) is provided with a transition arc surface (2121) structure.

6. The outgoing line protection assembly according to claim 5, characterized in that: An avoidance groove (11) is provided on the inner wall of the stator housing (1) at the wire welding position, and a protrusion (211) corresponding to the position of the avoidance groove (11) is provided on the outer wall of the electric isolation portion (21), and the protrusion (211) is matched and inserted into the avoidance groove (11).

7. The outgoing line protection assembly according to claim 6, characterized in that: The stator housing (1) is provided with a notch at the position of the outlet hole (213); the outlet sheath (2) further comprises a blocking portion (22) matching the size of the notch; the blocking portion (22) is arranged in the notch; the outlet hole (213) passes through the blocking portion (22); and the electric isolation portion (21) is connected to one side of the blocking portion (22).

8. The outgoing line protection assembly according to claim 7, characterized in that: The blocking portion (22) is provided with a protrusion protruding from the rotor end surface along the stator axis, and the protrusion is configured in a step shape with a high middle portion and low sides.

9. A motor, characterized in that: It comprises an outgoing line protection assembly as described in any one of claims 1 to 8.

10. The motor according to claim 9, characterized in that: The motor further comprises an end cover (3), wherein the end cover (3) is buckled onto one end of the stator, and the electrical isolation portion (21) is sealed between the end cover (3) and the stator.

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