A motor winding embedded overload protector

Abstract

The present application relates to the technical field of overload protection, and particularly relates to a motor winding embedded overload protector, which comprises a protector body embedded in a stator body and an embedding structure; the stator body comprises an insulation framework and winding assemblies arranged at intervals between the insulation framework; the inside of the protector body comprises a temperature-sensitive metal sheet; the embedding structure comprises a heat-conducting pressing sheet and an extended cover plate, the heat-conducting pressing sheet presses the protector body against one end of the winding assembly; the heat-conducting pressing sheet and the temperature-sensitive metal sheet correspond to each other in position and shape; one end of the extended cover plate is in contact with the winding assembly, the extended cover plate conducts the heat of the winding assembly to the temperature-sensitive metal sheet through the heat-conducting pressing sheet, the center of the temperature-sensitive metal sheet is provided with a center hole, and a plurality of inner division grooves are radially arranged on the outer peripheral edge of the center hole, the present application realizes stable installation and improves protection sensitivity.

Description

Technical Field

[0001] This invention relates to the technical field of overload protection, and more particularly to an embedded overload protector for motor windings. Background Technology

[0002] The motor winding embedded overload protector is an overheat protection device specifically designed for motors. By inserting it into the motor stator winding, it monitors the motor's operating temperature in real time. In the event of abnormal operating conditions such as overload, stall, or phase loss, it can quickly cut off the power supply, effectively preventing the motor from burning out and ensuring the safe operation of the equipment.

[0003] A motor is disclosed in existing patent publication number CN101359855A, including a stator winding portion connected to a power source; an overload protector for cutting off an overload power source applied to the stator winding portion; a fixing bracket fixed to the surface of the stator winding portion, the fixing bracket having an overload protector coupling portion detachably connected to the overload protector and a straight wire groove formed on the outer surface of the fixing bracket; and yarn received in the wire groove for winding the fixing bracket and the stator winding portion together.

[0004] In the above technical solution, the yarn connects the fixing bracket and the stator winding part together, thereby connecting the overload protector to the winding part. However, the fixing bracket is spaced between the protector and the stator winding, which leads to low heat conduction efficiency and slow temperature response, affecting the sensitivity of the protector. Moreover, the placement part on the fixing bracket is formed to correspond to the shape of the overload protector, so it can only be fixed for protectors of a single shape and specification, which is very limited. In addition, the manual binding of the fixing bracket by wrapping the yarn is inconvenient and has low installation efficiency.

[0005] Therefore, it is necessary to provide an embedded overload protector for motor windings to solve the problems mentioned in the background art. Summary of the Invention

[0006] The purpose of this invention is to provide an embedded overload protector for motor windings, which achieves stable installation and improves protection sensitivity.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a motor winding embedded overload protector, comprising a protector body and an embedded structure embedded in the stator body; the stator body includes an insulating frame and winding assemblies spaced apart between the insulating frames;

[0008] The protector body includes a temperature-sensitive metal plate inside;

[0009] The embedded structure includes a heat-conducting pressure plate and an extended cover plate, wherein the heat-conducting pressure plate presses the protector body against one end of the winding assembly;

[0010] The thermally conductive pressure plate and the temperature-sensitive metal plate are positioned and shaped to correspond to each other.

[0011] One end of the extended cover plate is in close contact with the winding assembly, and the extended cover plate directs the heat of the winding assembly into the temperature-sensing metal sheet through the heat-conducting pressure plate.

[0012] As a preferred embodiment of the present invention, the temperature-sensitive metal sheet has a central hole through its center, and the central hole has a plurality of inner dividing grooves radially extending outward from its outer periphery. The outer periphery of the temperature-sensitive metal sheet has a plurality of outer dividing grooves radially extending outward from its central hole, and the inner dividing grooves and the outer dividing grooves are arranged alternately.

[0013] The temperature-sensitive metal sheet has a pair of contacts at both ends.

[0014] As a preferred embodiment of the present invention, the extended cover plate is provided in a pair and symmetrically distributed, and the extended cover plate includes a vertical portion and an arc-shaped portion;

[0015] The vertical sections are symmetrically arranged at both ends of the protector body;

[0016] The inner side of the arc-shaped portion is in contact with one end of the winding assembly;

[0017] A pair of extended cover plates are snapped onto both ends of the winding assembly via an arc-shaped portion;

[0018] A heat-conducting cover plate is provided between the vertical portions of a pair of extended cover plates, and the heat-conducting pressure plate is provided at one end of the heat-conducting cover plate near the protector body.

[0019] As a preferred embodiment of the present invention, the embedded structure further includes a reference plate, which is fixed to the insulating frame;

[0020] The reference plate is provided with several connecting seats, one end of each connecting seat is provided with a connecting rod, and one end of each connecting rod is provided with a connecting post coaxially. The connecting post is fixed to the outside of the junction of the vertical part and the arc-shaped part.

[0021] As a preferred embodiment of the present invention, the connecting rod is slidably fitted with a positioning plate, and the positioning plate is correspondingly disposed on one side of the protector body;

[0022] The inner side of the insulating frame is provided with a protrusion, and the positioning plate cooperates with the protrusion to clamp and limit the protector body.

[0023] As a preferred embodiment of the present invention, the heat-conducting cover plate has guide openings at both ends, and the vertical part of the extension cover plate passes through the guide openings and slides with them.

[0024] As a preferred embodiment of the present invention, a top fixing frame is connected to the top of a pair of extended cover plates, and a cylindrical cavity is fixedly connected to the center of the top fixing frame. A countersunk groove is opened on the top of the heat-conducting cover plate, and a spring is provided between the cylindrical cavity and the countersunk groove.

[0025] As a preferred embodiment of the present invention, the top fixing frame is provided with a plurality of square holes, and the top of the heat-conducting cover is provided with a plurality of heat dissipation fins, the square holes corresponding to the positions of the heat dissipation fins.

[0026] As a preferred embodiment of the present invention, the surface of the reference plate is provided with a plurality of card slots, the inner wall of the card slots is provided with buckle grooves, each pair of card slots is correspondingly provided on both sides of the connecting rod, the connecting rod is provided with a U-shaped locking member, the inner sides of both ends of the U-shaped locking member are provided with buckles, the U-shaped locking member is upside down on the connecting rod, and the bottom is inserted into the card slot.

[0027] In a preferred embodiment of the present invention, the upper inner side of the U-shaped lock has a U-shaped inner cavity, and an arc-shaped push plate extends from one end of the U-shaped lock towards the positioning plate. The two ends of the arc-shaped push plate are fixedly connected to semi-circular arc plates, and a guide plate is fixedly connected between the two semi-circular arc plates. A guide groove is provided at one end of the inner side of the U-shaped lock, and the semi-circular arc plate at one end slides along the U-shaped inner cavity, while the guide plate slides into the guide groove. A spring is provided inside the U-shaped inner cavity, and the other semi-circular arc plate abuts against the positioning plate.

[0028] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention directly presses the protector body onto the winding assembly through a heat-conducting pressure plate, avoiding the presence of a gap structure in the middle. The heat-conducting pressure plate can simultaneously achieve the functions of pressing and fixing and assisting heat conduction, improving the structural utilization rate and making the design reasonable. At the same time, the heat-conducting pressure plate and the temperature-sensing metal sheet correspond to each other to form a double-sided heating structure, increasing the heat transfer area and improving the heat conduction efficiency, thereby improving the timeliness and sensitivity of temperature monitoring and enabling rapid response to temperature rise under abnormal operating conditions such as overload and stall. Attached Figure Description

[0029] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0030] In the attached diagram:

[0031] Figure 1 This is a schematic diagram of the overload protector embedded in the overall structure of the present invention;

[0032] Figure 2 This is a three-dimensional schematic diagram of the protector body of the present invention;

[0033] Figure 3 This is a three-dimensional schematic diagram of the temperature-sensing metal sheet of the present invention;

[0034] Figure 4 This is a cross-sectional schematic diagram of the embedded structure of the present invention;

[0035] Figure 5 This is a three-dimensional schematic diagram of the insulating frame of the present invention;

[0036] Figure 6 This is a three-dimensional schematic diagram of the embedded structure of the present invention;

[0037] Figure 7 This is a three-dimensional schematic diagram of the heat-conducting cover plate of the present invention;

[0038] Figure 8 This is a schematic diagram of the U-shaped locking mechanism of the present invention;

[0039] Figure 9 This is an exploded perspective view of the U-shaped lock component of the present invention;

[0040] Figure 10 This is a three-dimensional schematic diagram of the interior of the U-shaped lock component of the present invention;

[0041] In the diagram: 1. Embedded structure; 101. Thermally conductive pressure plate; 102. Extended cover plate; 103. Thermally conductive cover plate; 104. Top fixing frame; 105. Cylindrical cavity; 106. Guide opening; 107. Heat dissipation fins;

[0042] 2. Protector body; 201. Temperature-sensing metal strip; 202. Center hole; 203. Inner dividing groove; 204. Outer dividing groove; 205. Contact;

[0043] 3. Reference plate; 301. Connecting seat; 302. Connecting rod; 303. Connecting column; 304. Positioning plate; 305. Arc-shaped push plate; 306. Semi-circular arc plate; 307. Guide plate; 308. Guide groove;

[0044] 4. Winding assembly;

[0045] 5. Insulating frame; 501. Protrusion;

[0046] 6. Stator body;

[0047] 7. Spring;

[0048] 8. U-shaped lock; 801. U-shaped inner cavity;

[0049] 9. Card slot. Detailed Implementation

[0050] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0051] Please see Figure 1-10 The present invention provides a technical solution: an embedded overload protector for motor windings, comprising a protector body 2 embedded in the stator body 6 and an embedded structure 1; the stator body 6 includes an insulating frame 5 and winding assemblies 4 spaced apart between the insulating frames 5;

[0052] The protector body 2 contains a temperature-sensitive metal plate 201;

[0053] The embedded structure 1 includes a heat-conducting pressure plate 101 and an extension cover plate 102. The heat-conducting pressure plate 101 presses the protector body 2 against one end of the winding assembly 4.

[0054] The thermally conductive pressure plate 101 and the temperature-sensitive metal plate 201 are positioned and shaped to correspond to each other.

[0055] One end of the extension cover plate 102 is in contact with the winding assembly 4, and the extension cover plate 102 directs the heat of the winding assembly 4 into the temperature-sensitive metal sheet 201 through the heat-conducting pressure plate 101.

[0056] Specifically, the operator presses the heat-conducting pressure plate 101 onto the protector body 2 on the winding assembly 4, while extending the cover plate 102 to fit the surface of the winding assembly 4, and electrically connects the wiring terminals of the protector body 2 to the connection terminals of the winding assembly 4. When the winding assembly 4 generates heat during operation, the heat is transferred to the lower end face of the protector body 2 on one hand, and to the heat-conducting pressure plate 101 through the extended cover plate 102 on the other hand. While pressing and fixing the protector body 2, the heat-conducting pressure plate 101 conducts heat to the internal temperature-sensing metal sheet 201, setting up a dual heat transfer path to achieve double-sided heating of the protector body 2. The temperature-sensing metal sheet 201 monitors temperature changes in real time. When the temperature reaches the abnormal threshold, the temperature-sensing metal sheet 201 deforms, cutting off the power transmission and achieving overload protection.

[0057] In this embodiment, the protector body 2 is directly pressed onto the winding assembly 4 by the heat-conducting pressure plate 101, avoiding the presence of a gap structure in the middle. The heat-conducting pressure plate 101 can simultaneously achieve the functions of pressing and fixing and assisting heat conduction, improving the structural utilization rate and making the design reasonable. At the same time, the heat-conducting pressure plate 101 and the temperature-sensing metal sheet 201 correspond to each other to form a double-sided heating structure, increasing the heat transfer area and improving the heat conduction efficiency, thereby improving the timeliness and sensitivity of temperature monitoring and enabling rapid response to temperature rise under abnormal operating conditions such as overload and stall.

[0058] Furthermore, the pressure of the heat-conducting pressure plate 101 makes it fit and contact the upper end face of the protector body 2, and makes the bottom of the protector body 2 fit tightly against the winding assembly 4, reducing the contact gap, thereby ensuring heat conduction efficiency, fast response speed, and avoiding heat transfer lag caused by poor contact.

[0059] Furthermore, by setting the heat-conducting pressure plate 101 to press the protector body 2 from top to bottom, there is no need to set a placement structure that matches the shape of a single protector, which can adapt to protector bodies 2 of various specifications and shapes, and has good versatility.

[0060] Furthermore, the embedded fixing method using heat-conducting pressure plate 101 eliminates the need for manual yarn winding and binding, improving installation convenience and facilitating mass production and on-site maintenance;

[0061] Furthermore, an extension cover plate 102 is provided to extend to the side of the winding assembly 4 for heat conduction. When the heat distribution of the winding is uneven, it avoids the situation where it is difficult to detect hot spots by relying solely on the protector body 2. In addition, when the temperature of the winding assembly 4 rises due to abnormal conditions such as motor stall or phase loss, double-sided heat transfer is achieved through the extension cover plate 102, avoiding uneven local deformation of the temperature-sensing metal sheet 201 caused by single-sided heat transfer, which would cause trigger delay problems.

[0062] Preferably, the heat-conducting pressure plate 101 is a circular plate, corresponding to the temperature-sensing metal plate 201, and has slight elastic protrusions on its surface to improve the tightness and fit, increase the heat-conducting contact area, and the material is made of a high thermal conductivity material, including but not limited to aluminum, copper or thermal alloy, to ensure heat transfer and maintain a stable clamping force.

[0063] Based on the above embodiments, a central hole 202 is provided through the center of the temperature-sensitive metal sheet 201, and a plurality of inner dividing grooves 203 are radially provided from the central hole 202 to the outer peripheral edge. A plurality of outer dividing grooves 204 are radially provided from the outer periphery of the temperature-sensitive metal sheet 201 to the central hole 202. The inner dividing grooves 203 and the outer dividing grooves 204 are arranged alternately.

[0064] A pair of contacts 205 are provided at both ends of the temperature-sensitive metal sheet 201.

[0065] In this embodiment, by setting up staggered inner and outer dividing grooves, the temperature-sensing metal sheet 201 is divided into multiple elastic temperature-sensing units, which reduces the rigidity of the overall structure and reduces the thermal deformation resistance. When the temperature changes, each temperature-sensing unit can simultaneously and quickly undergo thermal expansion and contraction deformation. Compared with the traditional integrated temperature-sensing sheet, the response time to temperature changes is shorter. Combined with the double-sided heat-conducting structure of the above embodiment, the effect of rapid temperature measurement and timely protection is further achieved.

[0066] Furthermore, the temperature-sensing metal sheet 201 is circular, thus corresponding to the heat-conducting pressure plate 101, improving the accuracy of heat transfer; the contacts 205 at both ends of the temperature-sensing metal sheet 201 are connected to the power conduction circuit inside the protector body 2, and the motor power is normally connected when the contacts 205 are closed, and the power is cut off when the contacts 205 are open.

[0067] It should be noted that the specific internal structure of the protector body 2 is existing technology in this field, so it will not be described in detail here.

[0068] Based on the above embodiments, a pair of extended cover plates 102 are provided and symmetrically distributed, and the extended cover plates 102 include a vertical part and an arc-shaped part;

[0069] The vertical parts are symmetrically arranged at both ends of the protector body 2;

[0070] The inner side of the arc-shaped part is in contact with one end of the winding assembly 4;

[0071] A pair of extended cover plates 102 are snapped onto both ends of the winding assembly 4 via an arc-shaped portion;

[0072] A heat-conducting cover plate 103 is provided between the vertical portions of a pair of extended cover plates 102, and a heat-conducting pressure plate 101 is provided at one end of the heat-conducting cover plate 103 near the protector body 2.

[0073] In this embodiment, by setting a pair of symmetrically distributed extended cover plates 102, and cooperating with the arc-shaped part to fit and snap into the winding assembly 4, symmetrical clamping and fixing are formed at both ends of the winding assembly 4, improving the tightness of the fit and preventing loosening and displacement during motor operation vibration.

[0074] Furthermore, symmetrical extension cover plates 102 and heat-conducting cover plates 103 are set to form a closed frame structure, which improves the overall rigidity and further reduces the impact of motor vibration on the assembly structure. During assembly, it is only necessary to snap a pair of extension cover plates 102 onto both ends of the winding assembly 4 through the arc part, and the vertical part can limit the protector body 2. The heat-conducting cover plate 103 and the heat-conducting pressure plate 101 can press the protector body 2 tightly, reducing the assembly difficulty and improving the efficiency of mass production.

[0075] Preferably, the vertical part is rectangular in shape and symmetrically distributed at the left and right ends of the protector body 2. The length is adapted to the height of the protector body 2, so that after the heat-conducting cover plate 103 is attached, the heat-conducting pressure plate 101 can press the upper end face of the protector body 2 tightly. The inner end face of the vertical part is polished to improve the tightness of contact with the heat-conducting cover plate 103.

[0076] Preferably, the arc-shaped part is a concave arc-shaped sheet with a slight elastic force to enhance the clamping force during snapping. The material is a high thermal conductivity material, including but not limited to aluminum or copper alloy, and is integrally formed with the vertical part to ensure continuous heat conduction.

[0077] Preferably, a thermally conductive silicone pad is provided on the inner side of the arc-shaped portion to further fill the gap between the arc-shaped portion and the contact surface of the winding assembly 4, improve the thermal conductivity, enhance the friction of the contact surface, further improve the snap-fit ​​stability, and at the same time avoid the arc-shaped portion from damaging the insulation layer of the winding assembly 4.

[0078] Based on the above embodiments, the embedded structure 1 also includes a reference plate 3, which is fixed to the insulating frame 5 of the stator body 6.

[0079] The reference plate 3 is provided with several connecting seats 301. One end of the connecting seat 301 is provided with a connecting rod 302. One end of the connecting rod 302 is coaxially provided with a connecting post 303. The connecting post 303 is fixed to the outside of the junction of the vertical part and the arc-shaped part.

[0080] Specifically, the reference plate 3 is fixed to the insulating frame 5 of the stator body 6, and a pair of extended cover plates 102 are rigidly fixed by the connecting seat 301, connecting rod 302 and connecting column 303 to ensure the stability of the embedded structure 1 during motor operation.

[0081] In this embodiment, the embedded structure 1 and the insulating frame 5 of the stator body 6 are rigidly connected by the reference plate 3. Combined with the snap-fit ​​of the arc part in the above embodiment, the high-frequency vibration generated during motor operation is further reduced, the protector body 2 is prevented from loosening, shifting or falling off, and the stability of operation is improved.

[0082] Furthermore, the connecting post 303 is located at the connection between the vertical part and the arc-shaped part to improve the overall structural rigidity. The connecting post 303 is made of the same high thermal conductivity material as the extension cover plate 102 to avoid affecting heat transfer.

[0083] Preferably, the reference plate 3 is configured as a sheet structure that matches the contour of the insulating skeleton 5, and is made of high-strength insulating material, including but not limited to glass fiber reinforced nylon or epoxy resin board, which has good electrical insulation properties;

[0084] Preferably, the reference plate 3 is fixed to the insulating frame 5 by bolts, which facilitates the maintenance and replacement of the protector body 2 in the later stage without disassembling the entire stator body 6, thus reducing maintenance costs.

[0085] Based on the above embodiments, the connecting rod 302 is slidably fitted with a positioning plate 304, and the positioning plate 304 is correspondingly disposed on one side of the protector body 2;

[0086] The inner side of the insulating frame 5 is provided with a protrusion 501, and the positioning plate 304 cooperates with the protrusion 501 to clamp and limit the protector body 2.

[0087] Specifically, the positioning plate 304 slides along the connecting rod 302, and works with the protrusion 501 of the insulating frame 5 to clamp and limit the position of the protector body 2, further improving the positional stability of the protector body 2.

[0088] In this embodiment, by setting the positioning plate 304, the protector body 2 is limited in front and back, and in conjunction with the heat-conducting pressure plate 101 in the above embodiment, it is limited in the upper and lower parts, which further avoids the displacement of the protector body 2 caused by motor vibration and improves stability.

[0089] Furthermore, the positioning plate 304 is slidably engaged with the connecting rod 302, which is suitable for clamping and limiting the protector body 2 of various widths, and has good versatility;

[0090] Preferably, the positioning plate 304 has a grid-like anti-slip texture on the side surface near the protector body 2 to further increase the friction during clamping and prevent the protector body 2 from sliding.

[0091] Based on the above embodiment, the heat-conducting cover plate 103 has guide openings 106 at both ends, and the vertical part of the extension cover plate 102 passes through the guide openings 106 and slides with them.

[0092] In this embodiment, the heat-conducting cover plate 103 is made movable, so that its position can be adjusted along the vertical part within a certain range, further compensating for dimensional errors caused by manufacturing tolerances or assembly deviations, ensuring that the heat-conducting pressure plate 101 is always tightly pressed with the protector body 2, and at the same time it can be applied to protector bodies 2 of various thicknesses, ensuring the stability of heat transfer and structural versatility.

[0093] Preferably, the surface of the vertical part that contacts the guide opening 106 is polished to reduce sliding friction resistance, and is provided with a boron nitride coating to ensure wear resistance while ensuring good thermal conductivity, thereby improving service life and thermal efficiency.

[0094] Preferably, thermally conductive silicone grease can be applied to the contact surface between the vertical portion and the guide opening 106 to fill the tiny gaps and further reduce thermal resistance;

[0095] Preferably, a self-locking mechanism is provided at the sliding fit between the guide opening 106 and the vertical part, including but not limited to using bolts to lock it. When the heat-conducting cover 103 is adjusted to a suitable position, the heat-conducting cover 103 can be locked in the current position by the self-locking mechanism to ensure that it will not be displaced due to vibration during operation.

[0096] Based on the above embodiment, a top fixing frame 104 is connected to the top of a pair of extended cover plates 102, and a cylindrical cavity 105 is fixedly connected to the center of the top fixing frame 104. A countersunk groove is opened on the top of the heat-conducting cover plate 103, and a spring 7 is provided between the cylindrical cavity 105 and the countersunk groove.

[0097] Specifically, a pair of extended cover plates 102 are connected as a whole by the top fixing bracket 104, so that the spring 7 in the cylindrical cavity 105 applies a continuous downward preload to the heat-conducting cover plate 103, pushing the heat-conducting pressure plate 101 to press tightly against the upper end face of the protector body 2, while making the lower end face of the protector in close contact with the winding assembly 4.

[0098] In this embodiment, a spring 7 is provided to automatically compensate for the gap caused by component deformation due to motor vibration or temperature changes, ensuring the stability and efficiency of temperature transfer in the double-sided heat conduction path.

[0099] Furthermore, the spring 7 is provided so that the heat-conducting cover 103 can be used with protector bodies 2 of various thicknesses, and avoids dimensional errors caused by manufacturing tolerances, eliminating the need for manual adjustment or replacement of parts.

[0100] Based on the above embodiment, a number of square holes are provided through the top fixing frame 104, and a number of heat dissipation fins 107 are provided on the top of the heat conduction cover plate 103, with the square holes corresponding to the positions of the heat dissipation fins 107.

[0101] Specifically, when the abnormal heat generated by the winding assembly 4 is transferred to the temperature-sensitive metal sheet 201 through the double-sided heat conduction path, the excess heat absorbed by the heat conduction cover 103 is dissipated into the air channel at the end of the motor by the directional heat dissipation channel formed by the heat dissipation fins 107.

[0102] In this embodiment, the heat dissipation fins 107 prevent heat from accumulating inside the protector body 2, reduce the operating temperature of the heat conduction cover 103 and the protector body 2, prevent performance degradation or false triggering of the protector body 2 due to overheating, and improve service life.

[0103] Furthermore, by setting square holes, the overall weight of the top mounting bracket 104 structure is reduced, while providing heat dissipation space for the heat dissipation fins 107. The design is simple and reasonable.

[0104] It is important to note that the heat-conducting cover 103 is directly attached to the protector body 2, resulting in low contact thermal resistance and a short thermal resistance path. Therefore, heat will preferentially enter the protector body 2 through the heat-conducting pressure plate 101. The heat dissipation fins 107 only remove excess heat from the heat-conducting cover 103 that is not transferred to the protector body 2 in time, preventing the heat-conducting cover 103 from becoming too hot due to heat accumulation, which could cause the protector body 2 to be falsely triggered. In other words, the heat transfer rate is much greater than the heat dissipation rate, allowing the temperature-sensing metal plate 201 to more accurately reflect the true temperature of the winding assembly 4, thereby ensuring trigger accuracy.

[0105] Based on the above embodiments, the surface of the reference plate 3 is provided with a number of card slots 9, and the inner wall of the card slots 9 is provided with buckle grooves. Each pair of card slots 9 is correspondingly arranged on both sides of the connecting rod 302. The connecting rod 302 is provided with a U-shaped lock 8. Buckles are provided on the inner sides of both ends of the U-shaped lock 8. The U-shaped lock 8 is upside down on the connecting rod 302, and its bottom is inserted into the card slot 9.

[0106] Specifically, a U-shaped locking piece 8 is set up to be upside down on the connecting rod 302, with its bottom inserted into the slot 9 of the reference plate 3, and the buckle is inserted into the buckle groove, thereby further stabilizing the connecting rod 302 while applying a continuous downward slight pre-tightening force to the connecting rod 302;

[0107] In this embodiment, the U-shaped locking member 8 forms a rigid lock with the slot 9 and the buckle groove of the reference plate 3 through the buckle, which further reduces the high-frequency vibration during motor operation and prevents the connecting rod 302 from loosening, thereby ensuring that the relative position of the embedded structure 1 and the winding assembly 4 is always stable, and ensuring the stability of the triggering of the protector body 2.

[0108] Furthermore, the U-shaped lock 8 adopts an inverted snap-fit ​​design, which can be quickly installed without tools, simplifying the assembly process, improving mass production efficiency, and facilitating later maintenance and adjustment;

[0109] Preferably, the U-shaped lock 8 has a U-shaped structure and is made of high-strength engineering plastic to ensure structural rigidity. The inner sides of both ends are provided with elastic buckles, which are triangular or trapezoidal protrusions.

[0110] Based on the above embodiments, a U-shaped inner cavity 801 is provided on the upper inner side of the U-shaped lock 8. An arc-shaped push plate 305 extends from one end of the U-shaped lock 8 toward the positioning plate 304. Semi-circular arc plates 306 are fixedly connected to both ends of the arc-shaped push plate 305. A guide plate 307 is fixedly connected between the two semi-circular arc plates 306. A guide groove 308 is provided on one end of the inner side of the U-shaped lock 8. The semi-circular arc plate 306 at one end slides along the U-shaped inner cavity 801, and the guide plate 307 slides into the guide groove 308. A spring is provided in the U-shaped inner cavity 801. The semi-circular arc plate 306 at the other end abuts against the positioning plate 304.

[0111] Specifically, the U-shaped lock 8 is inverted on the connecting rod 302, and at the same time, the spring in the U-shaped inner cavity 801 pushes the semi-circular plate 306 to slide along the inner cavity, which drives the arc-shaped push plate 305 to press the positioning plate 304, so that the positioning plate 304 and the protrusion 501 elastically clamp the protector body 2.

[0112] In this embodiment, a spring provides a continuous elastic thrust to the arc-shaped push plate 305, which pushes the positioning plate 304 to tightly clamp the protector body 2, thereby making it suitable for protector bodies 2 of different widths and automatically compensating for gaps caused by motor vibration, preventing the protector body 2 from loosening or shifting.

[0113] Furthermore, the U-shaped locking piece 8 prevents the embedded structure 1 from becoming loose by fixing the connecting rod 302, and also presses the positioning plate 304 with the arc-shaped push plate 305 to further prevent the protector body 2 from moving relative to each other, thereby improving the reliability of the overall structure in a high-frequency vibration environment. The structure is reasonably designed, improves the utilization rate of the structure, and is highly practical.

[0114] Preferably, the guide plate 307 is a rectangular sheet structure, integrally formed with the semi-circular arc plate 306 and the arc-shaped push plate 305, and is inserted into the guide groove 308 to restrict the sliding direction of the semi-circular arc plate 306 and the arc-shaped push plate 305, avoid lateral displacement, and further improve the overall structural strength of the arc-shaped push plate 305.

[0115] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection, the internal communication between two components, or the interaction between two components. Those skilled in the art can understand the meaning of the above terms in this application according to the specific circumstances.

[0116] The above provides a detailed description of an embedded overload protector for motor windings provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An embedded overload protector for motor windings, characterized in that, It includes a protector body and an embedding structure embedded in the stator body; the stator body includes an insulating frame and winding assemblies spaced apart between the insulating frames; The protector body includes a temperature-sensitive metal plate inside; The embedded structure includes a heat-conducting pressure plate and an extended cover plate, wherein the heat-conducting pressure plate presses the protector body against one end of the winding assembly; The thermally conductive pressure plate and the temperature-sensitive metal plate are positioned and shaped to correspond to each other. One end of the extended cover plate is in close contact with the winding assembly, and the extended cover plate directs the heat of the winding assembly into the temperature-sensing metal sheet through the heat-conducting pressure plate. The extended cover plate is provided in a pair and is symmetrically distributed. The extended cover plate includes a vertical part and an arc-shaped part. The vertical sections are symmetrically arranged at both ends of the protector body; The inner side of the arc-shaped portion is in contact with one end of the winding assembly; A pair of extended cover plates are snapped onto both ends of the winding assembly via an arc-shaped portion; A heat-conducting cover plate is provided between the vertical portions of a pair of extended cover plates, and the heat-conducting pressure plate is provided at one end of the heat-conducting cover plate near the protector body; The embedded structure also includes a reference plate, which is fixed to the insulating frame; The reference plate is provided with several connecting seats, one end of each connecting seat is provided with a connecting rod, and one end of each connecting rod is provided with a connecting post coaxially. The connecting post is fixed to the outside of the junction of the vertical part and the arc-shaped part.

2. The motor winding embedded overload protector according to claim 1, characterized in that, The temperature-sensitive metal sheet has a central hole through its center, and a number of inner dividing grooves are radially formed from the central hole to its outer periphery. The temperature-sensitive metal sheet also has a number of outer dividing grooves radially formed from its outer periphery to the central hole. The inner dividing grooves and outer dividing grooves are arranged alternately. The temperature-sensitive metal sheet has a pair of contacts at both ends.

3. The motor winding embedded overload protector according to claim 1, characterized in that, The connecting rod passes through and is slidably fitted with a positioning plate, which is correspondingly disposed on one side of the protector body; The inner side of the insulating frame is provided with a protrusion, and the positioning plate cooperates with the protrusion to clamp and limit the protector body.

4. The motor winding embedded overload protector according to claim 1, characterized in that, The heat-conducting cover plate has guide openings at both ends, and the vertical part of the extension cover plate passes through the guide openings and slides with them.

5. The motor winding embedded overload protector according to claim 4, characterized in that, A top fixing frame is connected to the top of a pair of extended cover plates. A cylindrical cavity is fixedly connected to the center of the top fixing frame. A countersunk groove is opened on the top of the heat-conducting cover plate. A spring is provided between the cylindrical cavity and the countersunk groove.

6. The motor winding embedded overload protector according to claim 5, characterized in that, The top fixing frame has several square holes, and the top of the heat-conducting cover plate is provided with several heat dissipation fins, with the square holes corresponding to the positions of the heat dissipation fins.

7. The motor winding embedded overload protector according to claim 4, characterized in that, The surface of the reference plate is provided with several pairs of card slots, and the inner wall of the card slots is provided with buckle grooves. Each pair of card slots is correspondingly arranged on both sides of the connecting rod. The connecting rod is provided with a U-shaped lock, and the inner sides of both ends of the U-shaped lock are provided with buckles. The U-shaped lock is upside down on the connecting rod, and its bottom is inserted into the card slot.

8. The motor winding embedded overload protector according to claim 7, characterized in that, The U-shaped lock has a U-shaped inner cavity on its upper inner side. An arc-shaped push plate extends from one end of the U-shaped lock towards the positioning plate. Semi-circular arc plates are fixedly connected to both ends of the arc-shaped push plate. A guide plate is fixedly connected between the two semi-circular arc plates. A guide groove is provided at one end of the inner side of the U-shaped lock. The semi-circular arc plate at one end slides along the U-shaped inner cavity, and the guide plate slides into the guide groove. A spring is provided inside the U-shaped inner cavity. The semi-circular arc plate at the other end abuts against the positioning plate.

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