A wiring structure for a circuit breaker

Abstract

The utility model belongs to circuit breaker wiring technical field especially relates to a kind of wiring structure for circuit breaker, comprising: wiring shell and bolt, the bolt is threadedly arranged at the top of wiring shell, the side wall of wiring shell is equipped with cavity, the inner chamber of the cavity is fixedly connected with installation frame, the inner chamber of installation frame is respectively provided with the lower fixed plate and upper fixed plate for wiring in upper and lower ends;Elastic sheet, the elastic sheet is located at the top of upper fixed plate, the elastic sheet is used to when bolt drives upper fixed plate cooperation lower fixed plate to form extrusion to line, the reverse pre-tightening force that bolt is prevented from loosening is applied to bolt;The bottom of the bolt is equipped with heat dissipation channel, compared with prior art, the utility model improves the friction of bolt and wiring shell, prevents bolt gradually loosens, realizes the heat dissipation of elastic sheet and cavity internal element, reduces the security risk due to high temperature.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker wiring technology, and in particular relates to a wiring structure for circuit breakers. Background Technology

[0002] As an automatically operated electrical switching device, the core function of a circuit breaker is to quickly interrupt current when abnormalities such as overload, short circuit, or leakage occur in the circuit. The wiring structure, as the core connection between the circuit breaker and external conductors, directly determines the safety performance and service life of the circuit breaker through its robustness and heat dissipation. The wiring structure must achieve a reliable connection between the conductors and terminals through a stable fixing method (such as bolts or mounting plates). This must prevent poor contact caused by loose conductors and dissipate the heat generated by current flow in a timely manner to prevent component overheating and failure.

[0003] In the prior art, Chinese patent publication number 202322966848.7 proposes a terminal block for circuit breakers. By adding a mating block to replace the direct punching of threaded holes in the terminal block frame, it effectively solves the problems of thread stripping and screw jamming in traditional terminal blocks, improving screw tightening efficiency and assembly convenience. However, this technical solution only focuses on optimizing the assembly convenience of the terminal block and does not address the two core risks in actual circuit breaker usage scenarios, resulting in significant shortcomings in the existing wiring structure: 1. Existing wiring structures mostly rely on the friction between bolts and threads for fastening. When circuit breakers are in vibrating environments (such as near industrial equipment or in motor-driven scenarios), long-term vibration will cause the friction between bolts and threads to gradually decrease, resulting in a loss of bolt preload and a reduction in the contact load between the cable conductor and the terminal. Insufficient contact load will directly increase the conductor contact resistance, causing an abnormal rise in temperature at the contact point when current flows. The increased temperature will further exacerbate the difference in thermal expansion and contraction between the bolt and the thread, leading to an increase in the fit clearance and creating a vicious cycle of "loosening-heating-loosening," ultimately causing faults such as poor contact and terminal burning. In severe cases, it may even affect the overload protection response speed of the circuit breaker.

[0004] 2. During the wiring process, the current passing through the contact area between the conductor and the terminal will generate Joule heat. The existing wiring structure lacks an efficient heat dissipation path - the heat inside the housing mostly relies on natural heat dissipation, without a dedicated heat dissipation channel, heat conduction component or cooling structure, resulting in heat remaining in the wiring housing for a long time. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned technical problems by providing a wiring structure for circuit breakers.

[0006] This technical solution includes: The wiring housing and bolts are provided. The bolts are threaded on the top of the wiring housing. A cavity is provided on one side wall of the wiring housing. A mounting frame is fixedly connected to the inner cavity of the cavity. A lower fixing plate and an upper fixing plate for wiring are respectively provided at the upper and lower ends of the inner cavity of the mounting frame. An elastic sheet is provided on the top of the upper fixing plate. When the bolt drives the upper fixing plate and the lower fixing plate to compress the line, the elastic sheet can apply a reverse preload force to the bolt to prevent the bolt from loosening. The bottom of the bolt has a heat dissipation channel.

[0007] Preferably, the upper fixing plate is slidably disposed in the inner cavity of the mounting frame, and a heat-conducting ring is fixedly connected to the top of the upper fixing plate, and the elastic sheet is fixedly disposed with the heat-conducting ring.

[0008] Preferably, the bottom of the bolt extends through the top of the mounting frame and is connected to the elastic sheet via a heat dissipation channel.

[0009] Preferably, the plurality of elastic plates are fixedly distributed in a circumferential shape with the axis of the bolt as the center.

[0010] Preferably, a heat-conducting column is fixedly connected to the top of the elastic sheet, and the heat-conducting column extends into the inner cavity of the heat dissipation channel.

[0011] Preferably, the elastic sheet has a curved portion in the middle and a supporting portion at the bottom end, and the curved portion and the supporting portion are integrally formed of metal.

[0012] Preferably, the inner side of the support portion is open, the curved portion is V-shaped, and the heat-conducting column is installed on the top of the curved portion.

[0013] Preferably, a T-shaped post is provided through the upper fixing plate, and a threaded ring is provided inside the heat dissipation channel through a connecting rod. The T-shaped post passes through the heat-conducting ring and enters the heat dissipation channel to be threadedly connected to the inner hole of the threaded ring.

[0014] Preferably, a heat dissipation frame is fixedly connected to the bottom of the inner cavity of the mounting frame, the heat dissipation frame is fixedly disposed with the lower fixing plate, and multiple heat dissipation plates are fixedly connected to the inner cavity of the heat dissipation frame.

[0015] Preferably, a cooling channel is provided on one side of the wiring housing, and one end of the heat sink penetrates the inner wall of the cavity and extends into the cooling channel.

[0016] Compared with the prior art, the wiring structure for the circuit breaker described in this utility model has the following advantages: The threaded fit between the wiring housing and the bolt, combined with the squeezing action of the upper and lower fixing plates on the line, ensures the contact stability of the line during wiring and avoids poor contact caused by loosening of the line. The elastic sheet applies a reverse preload force to the bolt during the squeezing process, which can effectively prevent the bolt from loosening due to vibration, thermal expansion and contraction and other factors during long-term use, further ensuring the reliability of the wiring. The heat dissipation channel at the bottom of the bolt can dissipate the heat generated by the bolt and the line contact parts in time, avoiding overheating damage to the wiring structure or affecting the performance of the circuit breaker. Overall, it achieves a triple guarantee of secure wiring, anti-loosening and heat dissipation. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a structural diagram of the mounting frame of this utility model; Figure 3 This is a three-dimensional view of the bolt of this utility model; Figure 4 This is a disassembled structural diagram of the bolt of this utility model; Figure 5 This is a structural diagram of the elastic sheet of this utility model; Figure 6 This is a cross-sectional view of the bolt of this utility model.

[0018] The markings in the diagram are as follows: 100. Wiring housing; 110. Cavity; 120. Mounting frame; 130. Lower fixing plate; 140. Heat dissipation frame; 150. Heat dissipation plate; 160. Cooling channel; 200. Bolt; 210. Heat dissipation channel; 220. Threaded ring; 230. Elastic sheet; 231. Heat-conducting column; 232. Bending part; 233. Support part; 240. Heat-conducting ring; 250. Upper fixing plate; 260. T-shaped column; 270. Connecting rod. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0020] It should be noted that all directional and positional terms used in this utility model, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connection arrangements between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0021] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0023] like Figures 1-6 As shown, a wiring structure for a circuit breaker includes: The wiring housing 100 and the bolt 200 are threaded on the top of the wiring housing 100. A cavity 110 is opened on one side wall of the wiring housing 100. A mounting frame 120 is fixedly connected to the inner cavity of the cavity 110. A lower fixing plate 130 and an upper fixing plate 250 for wiring are respectively provided at the upper and lower ends of the inner cavity of the mounting frame 120. Elastic sheet 230 is provided on the top of upper fixing plate 250. When bolt 200 drives upper fixing plate 250 to cooperate with lower fixing plate 130 to compress the line, elastic sheet 230 can apply reverse preload force to bolt 200 to prevent bolt 200 from loosening. The bottom of the bolt 200 is provided with a heat dissipation channel 210, which extends to the top of the bolt 200 and communicates with the slot on the top of the bolt 200.

[0024] The threaded engagement between the wiring housing 100 and the bolt 200, combined with the compression effect of the upper and lower fixing plates 130 on the wiring, ensures the contact stability during wiring and prevents poor contact caused by loose wiring. The elastic plate 230 applies a reverse preload to the bolt 200 during compression, effectively preventing loosening of the bolt 200 due to vibration, thermal expansion and contraction during long-term use, further ensuring wiring reliability. The heat dissipation channel 210 at the bottom of the bolt 200 can dissipate heat generated by the bolt 200 and the wiring contact points in a timely manner, preventing overheating damage to the wiring structure or affecting circuit breaker performance. Overall, this provides a triple guarantee of secure wiring, anti-loosening, and heat dissipation. In the example of this application, the upper fixing plate 250 is slidably disposed in the inner cavity of the mounting frame 120, and a heat-conducting ring 240 is fixedly connected to the top of the upper fixing plate 250, and the elastic sheet 230 is fixedly disposed with the heat-conducting ring 240.

[0025] As a preferred example of this utility model, the upper fixing plate 250 is slidably disposed in the inner cavity of the mounting frame 120, and its position can be flexibly adjusted with the rotation of the bolt 200. It can cooperate with the lower fixing plate 130 to achieve stable compression for different specifications of wires. The heat-conducting ring 240 on the top of the upper fixing plate 250 is fixed to the elastic sheet 230, which can efficiently conduct the heat of the upper fixing plate 250 and the contact part of the wire to the elastic sheet 230, expand the heat transfer path, and improve the overall heat dissipation efficiency. At the same time, the heat-conducting ring 240 can also enhance the connection stability between the elastic sheet 230 and the upper fixing plate 250, and ensure the stable transmission of the preload of the elastic sheet 230.

[0026] In the example of this application, the bottom of the bolt 200 extends through the top of the mounting frame 120 and is connected to the elastic sheet 230 via the heat dissipation channel 210.

[0027] As a preferred example of this utility, The bottom of the bolt 200 passes through the top of the mounting frame 120 and is connected to the elastic plate 230 through the heat dissipation channel 210. On the one hand, this allows the pressure of the bolt 200 to be directly and smoothly transmitted to the elastic plate 230 and the upper fixing plate 250, ensuring that the squeezing force of the upper and lower fixing plates 130 on the circuit is uniform and stable, and avoiding poor contact caused by pressure transmission loss. On the other hand, the heat dissipation channel 210 is in direct contact with the elastic plate 230, which can quickly transfer the heat of the elastic plate 230 and the upper fixing plate 250 into the heat dissipation channel 210 of the bolt 200, enhancing the heat dissipation effect. Moreover, this connection method makes the structure more compact and reduces the space occupied in assembly.

[0028] In the example of this application, a plurality of elastic sheets 230 are fixedly distributed in a circumferential shape with the axis of bolt 200 as the center.

[0029] As a preferred example of this utility model, multiple elastic plates 230 are circumferentially distributed around the axis of the bolt 200. This allows the reverse preload of the elastic plates 230 on the bolt 200 to be evenly distributed along the circumference of the bolt 200, preventing the bolt 200 from becoming skewed or loosening locally due to uneven force, and ensuring that the bolt 200 is always in a stable preload state. At the same time, the uniform preload can drive the upper fixing plate 250 to evenly compress the circuit, preventing damage from excessive local force or poor contact from insufficient local force, and improving wiring consistency and reliability.

[0030] In the example of this application, a heat-conducting column 231 is fixedly connected to the top of the elastic sheet 230, and the heat-conducting column 231 extends into the inner cavity of the heat dissipation channel 210.

[0031] As a preferred example of this utility model, the heat-conducting column 231 at the top of the elastic sheet 230 extends into the inner cavity of the heat dissipation channel 210, which can directly guide the heat generated by the deformation of the elastic sheet 230 and the heat from the upper fixing plate 250 into the heat dissipation channel 210. Compared with heat dissipation by the heat dissipation channel 210 alone, it increases the direct path and contact area of ​​heat conduction, and greatly improves the heat dissipation efficiency. It can effectively prevent the elastic sheet 230 from elastic decay or aging due to long-term overheating, ensure the long-term stability of its reverse preload, and extend the service life of the elastic sheet 230.

[0032] In the example of this application, a bending portion 232 is provided in the middle of the elastic sheet 230, and a support portion 233 is provided at the bottom end of the elastic sheet 230. The bending portion 232 and the support portion 233 are integrally formed of metal.

[0033] As a preferred example of this utility model, the bent portion 232 in the middle of the elastic sheet 230 enhances the elastic deformation capability, ensuring that sufficient and stable reverse preload is generated when the bolt 200 is compressed. At the same time, the bent structure can buffer the pressure of the bolt 200, preventing excessive pressure from damaging the circuit or fixing plate. The support portion 233 at the bottom provides stable support for the elastic sheet 230, preventing the elastic sheet 230 from shifting or deforming under force, and ensuring the accuracy of the preload direction. The bent portion 232 and the support portion 233 are integrally formed, which can improve the overall structural strength and fatigue resistance of the elastic sheet 230, prevent breakage at the splice, and ensure long-term reliability.

[0034] In the example of this application, the inner side of the support portion 233 is open, the curved portion 232 is V-shaped, and the heat-conducting column 231 is installed on the top of the curved portion 232.

[0035] As a preferred example of this utility model, the open design on the inner side of the support portion 233 can reduce the overall weight of the elastic sheet 230 and lower material costs while ensuring support strength. At the same time, it can increase air circulation in the support portion 233 area and assist in heat dissipation. The V-shaped bend portion 232 has better elastic deformation characteristics. Combined with the open design of the support portion 233, the reverse preload can be flexibly adjusted according to the magnitude of the bolt 200 extrusion pressure to adapt to the pressure requirements of different wiring scenarios. The heat-conducting column 231 is installed on the top of the bend portion 232, which can collect the heat of the bend portion 232 and maximize the efficiency of heat transfer to the heat dissipation channel 210, specifically solving the heat dissipation problem of the core heat-generating area of ​​the elastic sheet 230.

[0036] In the example of this application, a T-shaped post 260 is provided through the upper fixing plate 250, and a threaded ring 220 is provided inside the heat dissipation channel 210 through the connecting rod 270. The T-shaped post 260 passes through the heat conduction ring 240 and enters the heat dissipation channel 210 to be threadedly connected to the inner hole of the threaded ring 220. The T-shaped post 260 and the elastic sheet 230 can both be integrally formed of copper alloy.

[0037] As a preferred example of this utility model, the T-shaped post 260 penetrates the upper fixing plate 250 and is threadedly connected to the threaded ring 220 in the heat dissipation channel 210. This further fixes the relative position of the upper fixing plate 250 and the bolt 200, preventing the upper fixing plate 250 from shifting due to vibration or deformation of the elastic sheet 230 during long-term use, ensuring that the circuit is always in a stable compression state. At the same time, the T-shaped post 260 can serve as an additional heat conduction path, transferring the heat from the upper fixing plate 250 to the threaded ring 220 and the heat dissipation channel 210, thereby improving the overall heat dissipation efficiency, enhancing structural stability and wiring reliability. In addition, the connection rod 270 allows for a gap between the threaded ring 220 and the inner wall of the heat dissipation channel 210, avoiding affecting the heat conduction of the heat conduction post 231. Furthermore, when the bolt 200 rotates, the T-shaped post 260 rotates along with it, and the T-shaped post 260 can be rotatably connected to the upper fixing plate 250 via a bearing (the bottom of the T-shaped post 260 is embedded in the bottom of the upper fixing plate 250 and does not contact the wiring).

[0038] In the example of this application, a heat dissipation frame 140 is fixedly connected to the bottom of the inner cavity of the mounting frame 120. The heat dissipation frame 140 is fixedly disposed with the lower fixing plate 130, and a plurality of heat dissipation plates 150 are fixedly connected to the inner cavity of the heat dissipation frame 140.

[0039] As a preferred example of this utility model, the heat dissipation frame 140 at the bottom of the mounting frame 120 is fixed to the lower fixing plate 130, which can quickly conduct heat generated by the lower fixing plate 130 and the circuit contact parts; the multiple heat dissipation plates 150 inside the heat dissipation frame 140 greatly increase the heat dissipation area, which can quickly dissipate heat into the air, prevent the lower fixing plate 130 from structural aging or performance degradation due to long-term overheating, and at the same time prevent the contact resistance from increasing due to overheating of the circuit contact parts, ensuring stable wiring performance and extending the service life of the wiring structure.

[0040] In the example of this application, a cooling channel 160 is provided on one side of the wiring housing 100, the cooling channel 160 extends to the other side of the wiring housing 100, and filters are provided on both sides of the cooling channel 160. One end of the heat dissipation plate 150 penetrates the inner wall of the cavity 110 and extends into the cooling channel 160.

[0041] As a preferred example of this utility model, the cooling channel 160 on one side of the wiring housing 100 provides an independent heat dissipation space for the heat sink 150. The heat sink 150 extends into the cooling channel 160 and can directly contact the flowing air in the cooling channel 160, accelerating the heat exchange speed. Compared with heat dissipation only in the cavity 110, the heat dissipation efficiency is significantly improved. It can effectively avoid heat accumulation on the heat sink 150, thereby more efficiently reducing the temperature of the lower fixing plate 130 and the circuit contact parts, ensuring that the entire wiring structure is always within a suitable operating temperature range, and preventing safety hazards or performance failures caused by overheating.

[0042] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A wiring structure for a circuit breaker, characterized in that, include: A wiring housing (100) and a bolt (200) are provided. The bolt (200) is threaded on the top of the wiring housing (100). A cavity (110) is provided on one side wall of the wiring housing (100). A mounting frame (120) is fixedly connected to the inner cavity of the cavity (110). A lower fixing plate (130) and an upper fixing plate (250) for wiring are respectively provided at the upper and lower ends of the inner cavity of the mounting frame (120). Elastic sheet (230), the elastic sheet (230) is provided on the top of the upper fixing plate (250), the elastic sheet (230) can apply a reverse preload force to the bolt (200) to prevent the bolt (200) from loosening when the bolt (200) drives the upper fixing plate (250) to cooperate with the lower fixing plate (130) to compress the line; The bottom of the bolt (200) is provided with a heat dissipation channel (210).

2. The wiring structure for a circuit breaker according to claim 1, characterized in that, The upper fixing plate (250) is slidably disposed in the inner cavity of the mounting frame (120), and a heat-conducting ring (240) is fixedly connected to the top of the upper fixing plate (250). The elastic sheet (230) is fixedly disposed with the heat-conducting ring (240).

3. The wiring structure for a circuit breaker according to claim 1, characterized in that, The bottom of the bolt (200) passes through the top of the mounting frame (120) and is connected to the elastic sheet (230) through the heat dissipation channel (210).

4. The wiring structure for a circuit breaker according to claim 3, characterized in that, The multiple elastic plates (230) are fixedly distributed in a circular shape with the axis of the bolt (200) as the center.

5. A wiring structure for a circuit breaker according to claim 4, characterized in that, A heat-conducting column (231) is fixedly connected to the top of the elastic sheet (230), and the heat-conducting column (231) extends into the inner cavity of the heat dissipation channel (210).

6. A wiring structure for a circuit breaker according to claim 5, characterized in that, The elastic sheet (230) has a bent portion (232) in the middle and a support portion (233) at the bottom end. The bent portion (232) and the support portion (233) are integrally formed of metal.

7. A wiring structure for a circuit breaker according to claim 6, characterized in that, The inner side of the support (233) is open, the bending part (232) is V-shaped, and the heat-conducting column (231) is installed on the top of the bending part (232).

8. A wiring structure for a circuit breaker according to claim 6, characterized in that, A T-shaped post (260) is provided through the upper fixing plate (250). A threaded ring (220) is provided inside the heat dissipation channel (210) through the connecting rod (270). The T-shaped post (260) passes through the heat conduction ring (240) and enters the heat dissipation channel (210) to be threadedly connected to the inner hole of the threaded ring (220).

9. A wiring structure for a circuit breaker according to claim 1, characterized in that, A heat dissipation frame (140) is fixedly connected to the bottom of the inner cavity of the mounting frame (120). The heat dissipation frame (140) is fixedly set with the lower fixing plate (130). Multiple heat dissipation plates (150) are fixedly connected to the inner cavity of the heat dissipation frame (140).

10. A wiring structure for a circuit breaker according to claim 9, characterized in that, A cooling channel (160) is provided on one side of the wiring housing (100), and one end of the heat sink (150) penetrates the inner wall of the cavity (110) and extends into the cooling channel (160).

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