Transmission mechanism for switching action and circuit breaker

Abstract

The utility model relates to the field of circuit breakers, and provides a transmission mechanism used for switching action and a circuit breaker, the transmission mechanism used for switching action comprises a box body, a switching-off unit and a transmission unit, one inner side surface of the box body is provided with an installation guide rail, the switching-off unit comprises a stop shaft, a switching-off cam and a handle, the transmission unit comprises a permanent magnet part, a first connecting rod and a second connecting rod, a stop plate is arranged on the first connecting rod, and the permanent magnet part is arranged on the mounting guide rail; the second connecting rod is provided with a first limiting piece, a fixing seat and an opening spring which abuts against the position between the fixing seat and the first limiting piece, and the fixing seat is arranged on the installation guide rail. According to the transmission unit, integrated connection is achieved through assembly of all modules, fixation can be achieved only by installing a fixing base and a permanent magnet part, for example, the fixing base is locked through a bolt, the permanent magnet part is borne and installed through an installation plate, the modular structure is clear, disassembly and assembly are easy, later maintenance is also facilitated, and the cost is reduced. The practicability is improved.

Description

Technical Field

[0001] The utility model relates to the field of circuit breakers, in particular to a transmission mechanism for switch action and a circuit breaker. Background Art

[0002] With the development of the distribution network, more and more switch products are applied to it to ensure the reliable operation of the power grid. When a fault occurs in the power grid, the corresponding detection device will send a signal to make the switch product act instantaneously or choose to act with a time delay (i.e., trip), ensuring the safety of the power grid. After the fault is eliminated, the switch product can be closed again. Typical switch products include circuit breakers (indoor and outdoor), reclosers, etc. The internal mechanical structure that ensures the reliable action of the switch product is its transmission mechanism.

[0003] However, the installation of the transmission mechanism of the existing switch products is all directly welded to the box body to form an integral body. During maintenance, it is inconvenient to remove. If components such as support seats, fixing plates or detection switches fixed by welding are damaged, it is difficult to replace, and even the entire transmission mechanism needs to be replaced, which is time-consuming and laborious and increases costs. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a transmission mechanism for switch action and a circuit breaker, aiming to improve the problem that the modularization degree of the existing transmission mechanism for switches is relatively low and the operation is relatively inconvenient.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions: A transmission mechanism for switch action, comprising:

[0006] A box body, on one inner side surface of which an installation guide rail is provided;

[0007] A tripping unit, which includes a stop shaft rotatably arranged on the box body, a tripping cam arranged on the stop shaft, and a handle for driving the stop shaft to rotate, and the handle is arranged outside the box body; and

[0008] A transmission unit, which includes a permanent magnet, a first connecting rod arranged at one end of the permanent magnet, and a second connecting rod arranged at the other end of the permanent magnet. A driving member and a stop plate that abuts against the tripping cam to move or is spaced apart from it are arranged on the first connecting rod, and the permanent magnet is arranged on the installation guide rail;

[0009] A first limiting member, a fixing seat and a tripping spring that abuts between the fixing seat and the first limiting member are arranged on the second connecting rod, and the fixing seat is arranged on the installation guide rail.

[0010] Preferably, an opening is provided on one side of the box body, and a cover plate that seals and covers the opening;

[0011] On the other side of the box body, a plurality of fixing plates are provided.

[0012] Preferably, a return pin is provided on the stop shaft, and a return spring is provided between one inner side wall of the box body and the return pin;

[0013] On one inner side wall of the box body, two stroke limit posts for restricting the swinging range of the return pin are further provided.

[0014] Preferably, a manual separation auxiliary switch is provided on the other inner side wall of the box body, and a cam pressure plate for abutting or separating from the button of the manual separation auxiliary switch is provided on the stop shaft; the manual separation auxiliary switch and the stroke limit posts are provided on opposite inner side walls of the box body.

[0015] Preferably, two mounting plates for mounting the permanent magnetic members are symmetrically provided on the box body, a conversion head connected to the second connecting rod is provided at the other end of the permanent magnetic member, and a break for avoiding the conversion head is formed between the two mounting plates.

[0016] Preferably, a closing and opening indicator plate is provided on the second connecting rod, and an observation window for observing the opening indicator plate is provided on the cover plate;

[0017] A plurality of driving members are provided, and the plurality of driving members are provided on the first connecting rod and / or the second connecting rod, and connecting through holes for positioning with the driving members are provided on the box body.

[0018] Preferably, the first limiting member includes a threaded sleeve sleeved on the second connecting rod, an adjusting nut threadedly engaged with the threaded sleeve, and a pin connecting the threaded sleeve and the second connecting rod.

[0019] Preferably, a second limiting member for being disassembled or installed on the second connecting rod is further included, and the second limiting member is provided between the fixed seat and the rod end of the second connecting rod;

[0020] Preferably, an auxiliary unit is further provided on the mounting guide rail; the auxiliary unit includes an auxiliary switch provided on the mounting guide rail, an auxiliary lever provided on the second connecting rod, and a linkage plate for abutting and opening or separating from the auxiliary switch, the linkage plate is rotatably provided on the mounting guide rail, and one end of the linkage plate is provided on the second connecting rod;

[0021] A fork tooth for linking with the auxiliary lever is provided at one end of the linkage plate, and an auxiliary pressure plate is provided at the other end of the linkage plate.

[0022] A circuit breaker is further provided, including a transmission mechanism for switch actions as described above.

[0023] After adopting the above technical solution, compared with the background art, the utility model has the following advantages:

[0024] 1. The transmission mechanism includes three major parts: a box body, a tripping unit, and a transmission unit. The tripping unit is rotatably installed in the box body and is abutted by a tripping cam and a stop plate to perform the tripping operation. In the transmission unit, through the assembly between various modules, they are connected as a whole. Only the fixing seat and the permanent magnet component need to be installed to achieve fixation. For example, the fixing seat is locked by bolts, and the permanent magnet component is carried and installed by the mounting plate. The modular structure is clear, easy to disassemble and assemble, and is also beneficial to later maintenance, improving the practicality. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of the transmission mechanism for switch operation according to the utility model;

[0026] Figure 2 is a partial schematic diagram of the transmission mechanism for switch operation according to the utility model from the first perspective;

[0027] Figure 3 is Figure 2 an enlarged view of the circle marked A in

[0028] Figure 4 is a partial schematic diagram of the transmission mechanism for switch operation according to the utility model from the second perspective;

[0029] Figure 5 is a schematic structural diagram of the tripping unit of the transmission mechanism for switch operation according to the utility model;

[0030] Figure 6 is a schematic structural diagram of the first limiting member of the transmission mechanism for switch operation according to the utility model.

[0031] Description of the Reference Numerals:

[0032] 10. Box body; 101. Cover plate; 102. Fixed plate; 103. Manual tripping auxiliary switch; 104. Mounting plate; 105. Closing and tripping indicator board; 106. Observation window; 107. Mounting guide rail;

[0033] 20. Tripping unit; 201. Stop shaft; 202. Tripping cam; 203. Handle;

[0034] 2011. Reset pin; 2012. Reset spring; 2013. Stroke limiting column; 2014. Cam pressure plate;

[0035] 30. Transmission unit; 301. Permanent magnet component; 302. First connecting rod; 303. Second connecting rod;

[0036] 3011. Adapter;

[0037] 3021. Driving part; 3022. Stop plate;

[0038] 3031. First limiting part; 3032. Second limiting part; 3033. Fixed seat; 3034. Opening spring;

[0039] 31. Threaded sleeve; 32. Adjusting nut; 33. Pin;

[0040] 40. Auxiliary unit; 401. Auxiliary switch; 402. Auxiliary lever; 403. Linking plate;

[0041] 4031. Fork teeth; 4032. Auxiliary pressure plate. Detailed implementation mode

[0042] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0043] In addition, it should be noted that: the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are all based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element of the present utility model must have a specific orientation, so it cannot be understood as a limitation to the present utility model.

[0044] When an element is referred to as being "fixed to" or "disposed on" or "provided on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0045] Unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the utility model can be understood according to specific situations.

[0046] Embodiment 1

[0047] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4As shown in the figure, this embodiment provides a transmission mechanism for switch operation, including a box body 10, a tripping unit 20, and a transmission unit 30. The tripping unit 20 includes a stop shaft 201 rotatably arranged on the box body 10, a tripping cam 202 arranged on the stop shaft 201, and a handle 203 for driving the stop shaft 201 to rotate. An installation guide rail 107 is arranged on an inner side surface of the box body 10; the handle 203 is arranged outside the box body 10; the transmission unit 30 includes a permanent magnet member 301, a first connecting rod 302 arranged at one end of the permanent magnet member 301, and a second connecting rod 303 arranged at the other end of the permanent magnet member 301. A permanent magnet is arranged inside the permanent magnet member 301 to provide a permanent magnetic force so that the transmission mechanism for switch operation is kept in a closed state (i.e., a closed or conducting state); a driving member 3021 and a stop plate 3022 that abuts and moves or is spaced apart from the tripping cam 202 are arranged on the first connecting rod 302, and the permanent magnet member 301 is arranged on the installation guide rail 107; a first limiting member 3031, a fixed seat 3033, and a tripping spring 3034 that abuts between the fixed seat 3033 and the first limiting member 3031 are fixedly arranged on the second connecting rod 303, and the fixed seat 3033 is arranged on the installation guide rail 107.

[0048] The transmission mechanism of this embodiment can perform an opening operation on a switch product, such as a tripping operation on a circuit breaker, the disconnection of a knife switch, or the closing of a toggle switch and other similar operations. Specifically, the handle 203 drives the stop shaft 201 to rotate, so that the tripping cam 202 rotates synchronously. If the transmission mechanism for switch operation is in a tripping state, the tripping cam 202 rotates idly; if the transmission mechanism for switch operation is in a closing state, it will drive the transmission unit 30 to trip.

[0049] Specifically, the tripping cam 202 abuts against the stop plate 3022, driving the first connecting rod 302, the permanent magnet member 301, and the second connecting rod 303 to perform synchronous tripping actions. At the same time, during the process of the tripping cam 202 abutting against the stop plate 3022, after the tripping spring 3034 on the second connecting rod 303 abuts and moves a certain position, when the energy stored in the tripping spring 3034 is greater than the permanent magnetic holding force, the transmission mechanism completes the tripping action, and at the same time, the state of the transmission mechanism for switch operation also switches to the tripping state.

[0050] During assembly and production, the entire transmission mechanism for the switching action is installed in the form of individual modular parts, and can be fixed on the mounting rail 107 by means of bolts and nuts, and then the mounting rail is installed on the box body by bolts and nuts. Specifically, the stop shaft 201 can be rotatably installed on the box body 10 through a bearing and driven to rotate by the handle 203. The transmission unit 30 can be sequentially connected and assembled through the first connecting rod 302, the permanent magnet 301 and the second connecting rod 303 (for example, connected and assembled by means of a pin 33), and then the permanent magnet 301 is installed on the box body 10 through the mounting plate 104, and the fixing seat 3033 on the first connecting rod 302 is bolted to the mounting rail 107 to complete the installation of the transmission unit 30. The modular structural design facilitates the purpose of later disassembly, maintenance or replacement of parts.

[0051] As Figure 1 shown, in this embodiment, an opening is provided on one side of the box body 10 and a cover plate 101 that seals the opening; a plurality of fixing plates 102 are provided on the other side of the box body 10. The gap between the cover plate 101 and the opening of the box body 10 can be sealed by a silicone strip and then locked by bolts to achieve the purpose of sealing and covering the opening. On the other side of the box body 10, it can be connected and fixed through the fixing plate 102. The fixing plate 102 can be designed with through holes for bolt locking or plug-in installation. The protruding design of the fixing plate 102 can provide connection points for installation and improve practicability.

[0052] As Figure 5 shown, in this embodiment, a return pin 2011 is provided on the stop shaft 201, and a return spring 2012 is provided between an inner side wall of the box body 10 and the return pin 2011; two stroke limit posts 2013 for restricting the swing range of the return pin 2011 are also provided on an inner side wall of the box body 10. The return pin 2011 is designed perpendicular to the stop shaft 201 and swings as the stop shaft 201 rotates, thus pulling the return spring 2012 into a stretched state to provide the elastic force for return. At the same time, in order to prevent the stop shaft 201 from rotating too much and it is not easy to distinguish the rotation state of the stop shaft 201. Therefore, the rotation stroke is limited by the two stroke limit posts 2013 (it can be designed to ensure the operation is in place by touching the stroke limit posts 2013), so that the stop shaft 201 can be rotated by the handle 203, and the position state at this time can be easily distinguished, improving practicability.

[0053] Further, as Figure 5 shown, in this embodiment, a manual disconnection auxiliary switch 103 is provided on the other inner side wall of the box body 10, and a cam pressing plate 2014 that abuts or separates from the button of the manual disconnection auxiliary switch 103 is provided on the stop shaft 201; the manual disconnection auxiliary switch 103 and the stroke limit post 2013 are provided on the opposite inner side walls of the box body 10.

[0054] Specifically, the manual disconnection auxiliary switch 103 is an electronic switch. When the switch button of the manual disconnection auxiliary switch 103 is pressed, the manual disconnection auxiliary switch 103 can form a switch signal. The external terminal is electrically connected to the manual disconnection auxiliary switch 103 for electrical interlocking, that is, the position information of the transmission mechanism for switch operation can be obtained through the external terminal, and the state information of the transmission mechanism for switch operation can be obtained in the form of an electrical signal, ensuring the safety of the circuit breaker operation.

[0055] During use, the handle 203 drives the stop shaft 201 to rotate, and then synchronously drives the cam pressure plate 2014 to rotate, so that the cam pressure plate 2014 presses against the switch button of the manual disconnection auxiliary switch 103, which is synchronous with the action of the opening cam 202. At the same time, the manual disconnection auxiliary switch 103 switches its state. At this time, even if a closing signal is given to the circuit breaker, the transmission mechanism for switch operation will not act, ensuring the safety of the circuit breaker operation.

[0056] As Figure 4 shown, in this embodiment, two mounting plates 104 for mounting the permanent magnetic members 301 are symmetrically arranged inside the box body 10. A conversion head 3011 connected to the second link 303 is provided at the other end of the permanent magnetic member 301. A break for avoiding the conversion head 3011 is formed between the two mounting plates 104. The two mounting plates 104 can form a platform for placing the permanent magnetic member 301, and at the same time, avoid through the break, so that the conversion head 3011 can be connected to the second link 303, and the installation is simple and convenient. Specifically, the mounting plate 104 can be locked by bolts for subsequent disassembly; or, it can be connected by welding to improve the stability. The mounting plate 104 can also be formed by bolt - connecting two plates, one is connected to the permanent magnetic member 301, and the other is welded to the box body 10, so as to be flexibly installed on the box body and can be disassembled at the same time.

[0057] As Figure 2 and Figure 4 shown, in this embodiment, a closing - opening indicator plate 105 is provided on the second link 303. Therefore, as the second link 303 moves, the closing - opening indicator plate 105 switches its position (i.e., shows the closing or opening state). An observation window 106 for observing the closing - opening indicator plate is provided on the cover plate 101; there are multiple driving members 3021, and the multiple driving members 3021 are arranged on the first link 302 and / or the second link 303. Connection through - holes corresponding to the driving members 3021 are provided on the box body 10. When the cover plate 101 needs to be disassembled, the internal closing - opening indicator plate 105 can be viewed through the observation window 106. If it is in the open state, then disassemble it to improve the safety of use.

[0058] As Figure 3 、Figure 4 and Figure 6 As shown in Figure 6 , in this embodiment, the first limiting member 3031 includes a threaded sleeve 31 sleeved on the second connecting rod 303, an adjusting nut 32 threadedly engaged with the threaded sleeve 31, and a pin 33 connecting the threaded sleeve 31 and the second connecting rod 303. The threaded sleeve 31 is first sleeved on the first connecting rod 302, then fixedly connected through the positioning and insertion of a positioning pin, and then locked outside the threaded sleeve 31 through the adjusting nut 32 to achieve the purpose of fixed limitation. Further, a gasket can also be provided for use to increase the area of the end of the adjusting nut 32, which can be adapted to the abutment of different-sized closing springs 3034 for use, improving the practicality. The second limiting member 3032 has the same principle of use, achieving the effect of adjusting the tightness of the closing spring 3034 through the first limiting member 3031 and the second limiting member 3032, so as to ensure that the closing spring 3034 provides a corresponding elastic force for closing, with simple and convenient operation and good practicality.

[0059] This embodiment further includes a second limiting member 3032 detachably or installably mounted on the second connecting rod 303. The second limiting member 3032 is arranged between the fixed seat and the rod end of the second connecting rod; the second limiting member 3032 has the same structural arrangement as the first limiting member 3031.

[0060] Specifically, the second limiting member 3032 includes a threaded sleeve sleeved on the second connecting rod 303, an adjusting nut threadedly engaged with the threaded sleeve, and a pin connecting the threaded sleeve and the second connecting rod 303 (the pin has a clearance fit, that is, a through hole relatively larger than the pin is provided on the second connecting rod for subsequent disassembly and removal). The closing spring is pre-installed through the second limiting member. That is, the closing spring is clamped on the second connecting rod through the first limiting member and the second limiting member, and then the adjusting nut of the second limiting member is adjusted to realize the pre-compression of the closing spring. After the required pre-compression is completed, the adjusting nut, threaded sleeve and pin of the second limiting member are removed, which facilitates the adjustment of the closing spring.

[0061] As Figure 3 shown, in this embodiment, an auxiliary unit 40 is further provided on the box body 10. The auxiliary unit can display the position state of the switching device (such as the closing and opening position states of a circuit breaker); the auxiliary unit 40 includes an auxiliary switch 401 provided on the box body 10, an auxiliary lever 402 provided on the second connecting rod 303, and a linkage plate 403 that abuts and opens or separates from the auxiliary switch 401. The auxiliary switch 401 is an electronic switch, and the linkage plate 403 is rotatably arranged on the box body 10, and one end of the linkage plate 403 is arranged on the second connecting rod 303.

[0062] Specifically, by operating the auxiliary switch 401 to switch its state, the state of the switch is displayed on the box body 10 through the auxiliary switch 401. That is, when the second connecting rod 303 is driven to move axially, the linkage rod is driven to rotate through the auxiliary lever 402 at the same time, so that the linkage rod presses the switch of the auxiliary switch 401. After the electronic switch is pressed, a signal will be fed back. By electrically connecting the external terminal to the auxiliary switch 401 and also electrically connecting the closing and opening indicator board 105 to the external terminal, the switching of the closing and opening indication state can be formed, improving the practicability.

[0063] Furthermore, the auxiliary unit can also be connected to the signal lamp, and by pressing the switch button of the auxiliary switch 401, the operation of turning on and off the signal lamp can be realized.

[0064] As Figure 3 shown, in this embodiment, a fork tooth 4031 linked with the auxiliary lever 402 is arranged at one end of the linkage plate 403, and an auxiliary pressing plate 4032 is arranged at the other end of the linkage plate 403. Through the cooperation of the fork tooth 4031, it is convenient for assembly. At the same time, the auxiliary pressing plate 4032 can be used to increase the contact surface to ensure the switch operation of the auxiliary switch 401, improving the practicability.

[0065] Embodiment 2

[0066] This embodiment provides a circuit breaker, including the transmission mechanism for switch action described in Embodiment 1. Through the transmission mechanism, the module can be assembled and disassembled for subsequent maintenance, facilitating the disassembly of parts for replacement and reducing the maintenance cost.

[0067] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A transmission mechanism for switch action, characterized in that: include: The box body has a mounting rail disposed on one inner side thereof; A trip unit comprises a stop shaft rotatably arranged on the housing, a trip cam arranged on the stop shaft, and a handle driving the stop shaft to rotate, wherein the handle is arranged outside the housing; and A transmission unit, comprising a permanent magnet, a first connecting rod arranged on one end of the permanent magnet, and a second connecting rod arranged on the other end of the permanent magnet, wherein the first connecting rod is provided with a driving member and a stop plate which abuts against and moves with or is spaced apart from the opening cam, and the permanent magnet is arranged on the mounting rail; The second connecting rod is provided with a first limiting member, a fixing seat and a brake opening spring abutting between the fixing seat and the first limiting member, and the fixing seat is provided on the mounting guide rail.

2. The transmission mechanism for switch action according to claim 1, characterized in that: One side of the box body is provided with an opening and a cover plate sealingly covering the opening; A plurality of fixing plates are arranged on the other side of the box body.

3. The transmission mechanism for switch action according to claim 1, characterized in that: A reset pin is arranged on the stop shaft, and a reset spring is arranged between an inner side wall of the box body and the reset pin; Two travel limit columns for limiting the swing range of the reset pin are also arranged on an inner side wall of the box body.

4. The transmission mechanism for switch action according to claim 3, characterized in that: A manual separation auxiliary switch is arranged on the other inner side wall of the box body, and a cam pressure plate is arranged on the stop shaft to abut or separate from the button of the manual separation auxiliary switch; the manual separation auxiliary switch and the travel limit column are arranged on the opposite inner side walls of the box body.

5. The transmission mechanism for switch action according to claim 1, characterized in that: Two mounting plates for mounting the permanent magnet are symmetrically arranged on the box body, a conversion head connected to the second connecting rod is arranged on the other end of the permanent magnet, and a fracture for avoiding the conversion head is formed between the two mounting plates.

6. The transmission mechanism for switch action according to claim 2, characterized in that: The second connecting rod is provided with a switch-on and switch-off indicator, and the cover plate is provided with an observation window for observing the switch-off indicator; There are multiple driving members, and the multiple driving members are arranged on the first connecting rod and / or the second connecting rod. The box body is provided with connecting through holes arranged in alignment with the driving members.

7. The transmission mechanism for switch action according to claim 1, characterized in that: The first limiting member includes a threaded sleeve sleeved on the second connecting rod, an adjusting nut threadably engaged with the threaded sleeve, and a latch connecting the threaded sleeve and the second connecting rod.

8. The transmission mechanism for switch action according to claim 7, characterized in that: It also includes a second stopper that is removed or installed on the second connecting rod, and the second stopper is arranged between the fixing seat and the rod end of the second connecting rod; The second limiting member has the same structural arrangement as the first limiting member.

9. The transmission mechanism for switch action according to claim 1, characterized in that: An auxiliary unit is also provided on the mounting rail; the auxiliary unit comprises an auxiliary switch provided on the mounting rail, an auxiliary lever provided on the second connecting rod, and a linkage plate which abuts against the auxiliary switch to open or separate, the linkage plate being rotatably provided on the mounting rail, and one end of the linkage plate being provided on the second connecting rod; A fork tooth linked to the auxiliary shifting rod is arranged on one end of the linkage plate, and an auxiliary pressing plate is arranged on the other end of the linkage plate.

10. A circuit breaker, characterized in that: The invention comprises a transmission mechanism for switch action as claimed in any one of claims 1 to 9.

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