Fusion welding prevention microswitch

Abstract

The invention provides a fusion welding prevention microswitch, and belongs to the technical field of microswitches. Comprising a switch body; the first contact assembly comprises a first contact arm connected to the normally closed terminal of the switch body; the second contact arm is connected to the current input end of the switch body; the second contact assembly comprises a third contact arm which is located between the normally-closed terminal and the first current output end of the normally-closed terminal. The fourth contact arm is located between the normally-open terminal and a second current output terminal of the normally-open terminal; the transduction assembly comprises a first contact end, a second contact end and a capacitor. Through switching of the capacitor between a parallel connection state and a series connection state, buffer protection of instantaneous large current is realized in a normal working state, and contact melting is prevented. And when the contacts are adhered, the contacts are self-repaired through reverse discharge, so that the service life of the microswitch is prolonged.

Description

Technical Field

[0001] The invention relates to an anti-melting welding micro switch, belonging to the technical field of micro switches, and in particular to a micro switch capable of preventing terminals from being melted due to excessive current. Background Art

[0002] In many application scenarios, micro switches are used as key control components in various circuits that require reliable switching operations. However, in actual use, micro switches often face the situation of instantaneous large current passing through. In this case, the instantaneous increase in current may cause a strong arc effect between the micro switch contacts. Such arcs may cause the surface temperature of the contacts to rise sharply, causing partial melting of the contact material and adhesion.

[0003] Once the contacts melt and stick, the spring return structure of the micro switch cannot pull the contacts back to their original position, causing the contacts to lose their opening and closing functions, directly affecting the normal operation of the circuit, and even causing the switch function to fail. This not only causes damage to the micro switch, but may also cause the control system to interrupt its operation. Therefore, for circuits containing micro switches, special consideration should be given to the impact of instantaneous large currents on switch contacts during design.

[0004] It should be noted that although the impact of high current on the micro switch can be reduced by adding an overcurrent protection device, contact melting may still occur when instantaneous high current is inevitable. If high current continues to exist in the circuit, the contacts will be severely burned, which will not only cause the switch function to lose, but also require the replacement of new micro switch components, increasing maintenance costs.

[0005] Therefore, the design background of the present invention is only for the contact melting problem caused by instantaneous high current, rather than the situation of long-term excessive current. By designing an anti-melting welding micro switch, it can effectively prevent the contact from melting and sticking when an instantaneous high current passes through, thereby ensuring that the micro switch can work normally and reliably in the circuit. Summary of the invention

[0006] Based on this, it is necessary to provide an anti-melting welding micro switch to address the problem that the current micro switch is very likely to cause the terminals to melt and stick due to excessive current.

[0007] The above purpose is achieved through the following technical solutions: An anti-melting welding micro switch, comprising: Switch body; A first contact assembly comprising: a first contact arm connected to a normally closed terminal of the switch body; A second contact arm connected to a current input terminal of the switch body; The second contact assembly comprises: A third contact arm is located between the normally closed terminal and the first current output terminal thereof; a fourth contact arm, located between the normally open terminal and the second current output terminal thereof; The transducer assembly comprises: A first contact terminal, a second contact terminal and a capacitor; Wherein, when the common terminal of the switch body is connected to the normally closed terminal: The first contact end contacts the second contact arm; The second contact end is in contact with the third contact arm; The capacitor is connected in parallel to the normally closed circuit of the switch body; Wherein, when the switching mechanism of the switch body fails: The third contact arm contacts the fourth contact arm under the action of the external force F1 and is disconnected from the current output terminal 1 of the normally closed terminal, and the fourth contact arm is disconnected from the current output terminal 2 of the normally open terminal; At the same time, the first contact end is switched to be connected with the first contact arm under the action of the external force F2, and the second contact end is switched to be connected with the fourth contact arm; The capacitor is switched from being connected in parallel to being connected in series to a normally closed circuit of the switch body.

[0008] Preferably, the energy conversion component comprises: conversion lever; Wherein, the two rod end parts of the conversion rod are conductive to form the first contact end and the second contact end; Furthermore, the shaft of the conversion rod is a hollow structure and has insulation properties; Wherein, the wires used for connecting to the pins of the capacitor are connected to the first contact end and the second contact end respectively.

[0009] Preferably, it includes: A first transmission component, configured to transmit the external force F2 to the energy conversion component; The first transmission component comprises: Linkage parts and switching parts; The linkage member is connected to the switching mechanism of the switch body; The reversing member is connected to the linkage member; Wherein, the linkage member is controlled by the external force F2 applied to the switching mechanism, and drives the switching member to rotate a set angle; Furthermore, the conversion rod is slidably connected to the switching member and rotates synchronously with the switching member to promote the switching of the contact positions of the first contact end and the second contact end.

[0010] Preferably, the linkage member comprises a linkage rod, one end of which is connected to the switching mechanism of the switch body, and the other end of which is slidably connected to the housing of the switch body; Wherein, in the first stroke of the switching mechanism, the linkage rod remains stationary; Wherein, under the second stroke of the switching mechanism, the linkage rod follows the displacement of the switching mechanism; The reversing member comprises a gear 1 and a gear 2; Wherein, the gear 1 is connected to the linkage rod and is controlled by the displacement of the linkage rod to rotate at a set angle; Wherein, the gear 2 is meshedly connected with the gear 1, and the conversion rod is slidably connected to the gear 2; The first stroke refers to the displacement distance required for the switching mechanism of the switch body to be pressed down to switch the common terminal to contact with the normally closed terminal or the normally open terminal; The second stroke refers to the displacement distance of the switching mechanism of the switch body beyond the first stroke.

[0011] Preferably, the first contact component comprises: A limiting member, connected between the first contact arm and the second contact arm, and having insulation properties; Wherein, the limiting member forms a limiting groove, and the limiting groove at least exposes the first contact arm and the second contact arm; Wherein, the first contact end is slidably restricted in the limiting groove; Furthermore, the limiting groove has insulation properties at least in a region between the first contact arm and the second contact arm.

[0012] Preferably, the first contact arm has a connecting terminal; The connection terminal maintains contact connection with the normally closed terminal.

[0013] Preferably, the third contact arm and the fourth contact arm are elastic structures; Wherein, the third contact arm is controlled by the external force F1 to deform and displace away from the current output terminal 1 of the normally closed terminal; The fourth contact arm is controlled by the contact force with the third contact arm to deform and displace away from the second current output terminal of the normally open terminal.

[0014] Preferably, the third contact arm forms a contact guide groove 1; The fourth contact arm forms a second contact guide groove; Wherein, when the capacitors are in series connection, the second contact end is in contact with the first contact guide groove; Wherein, when the capacitors are in parallel connection state, the second contact end is in contact with the second contact guide groove.

[0015] Preferably, the housing of the switch body comprises: A front plate, a middle plate and a rear plate coupled in sequence; Wherein, the front plate and the middle plate are coupled to form a first installation space; Wherein, the middle plate and the rear plate are coupled to form a second installation space; Furthermore, the switching mechanism, the common terminal, the normally closed terminal and the first current output terminal thereof, and the normally open terminal and the second current output terminal thereof of the switch body are placed in the first installation space; Furthermore, the first contact component, the second contact component, and the transducer component are placed in the second installation space.

[0016] Preferably, the switching mechanism of the switch body comprises: A first switching arm having an end N1 and an end N2; a second switching arm having an end M1 and an end M2; The end N1 and the end M2 are connected by an elastic member; The end N2 is fixedly connected to the housing; The end M1 is in sliding contact with the current input end; Furthermore, the end portion N1 is elastic; Furthermore, the end M2 is connected to the common terminal.

[0017] The beneficial effects of the present invention are: In the normal state of the present invention, the capacitor of the transducer assembly is connected in parallel in the normally closed circuit to buffer instantaneous large currents and protect the contacts. The capacitor buffers instantaneous large currents in the parallel state to prevent the contacts from melting and sticking due to excessive current. When the contacts stick due to instantaneous large currents and the switching mechanism cannot be reset, the micro switch enters a self-repairing state and switches the capacitor to the series mode for self-repair by applying external force: in the series state, the capacitor is connected in series to the normally closed circuit. In this current path, the reverse current formed by the capacitor discharge acts on the contact area of ​​the adhesion, generating local high temperature, causing the adhesion to melt and separate, thereby releasing the adhesion and achieving self-repair of the micro switch.

[0018] The present invention realizes buffer protection of instantaneous large current under normal working conditions by switching the capacitor between parallel and series (reverse) states to prevent the contacts from melting; and self-repairs the contacts through reverse discharge when the contacts are stuck, thereby extending the life of the micro switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional diagram of an anti-melting welding micro switch according to an embodiment of the present invention; Figure 2 for Figure 1 Split diagram of the structure shown; Figure 3 One of the three-dimensional diagrams of the first contact component, the second contact component and the transducer component in the anti-melting welding micro switch according to an embodiment of the present invention; Figure 4 The second stereoscopic diagram of the first contact component, the second contact component and the transducer component in the anti-melting welding micro switch according to an embodiment of the present invention; Figure 5 A side view of an anti-melting welding micro switch according to an embodiment of the present invention; Figure 6 for Figure 5 A cross-sectional view of the structure shown along the AA direction; Figure 7 for Figure 5 One of the cross-sectional views of the structure shown along the BB direction (the capacitors are in parallel); Figure 8 for Figure 5 The second cross-sectional view of the structure shown along the BB direction (the capacitors are in series); Fig. 9 It is a structural schematic diagram of a transducer assembly in an anti-melting welding micro switch according to an embodiment of the present invention; Fig.10 for Fig. 9 A cross-sectional view of the structure shown along the CC direction; Fig.11 The figure is a schematic diagram of the connection between the linkage member and the first switching arm in the anti-melting welding micro switch according to an embodiment of the present invention.

[0020] in: 1. Switch body; 101. Normally closed terminal; 102. Current input terminal; 103. Normally open terminal; 104. Current output terminal 1; 105. Current output terminal 2; 106. Common terminal; 107. Front plate; 108. Middle plate; 109. Back plate; 2. First contact assembly; 201. First contact arm; 2011. Connecting terminal; 202. Second contact arm; 203. Stopper; 204. Stopper groove; 3. Second contact assembly; 301. Third contact arm; 302. Fourth contact arm ; 4. Transducer assembly; 401. First contact end; 402. Second contact end; 403. Capacitor; 404. Switch rod; 4041. Rod body one; 4042. Rod body two; 405. Wire; 501. State switching button; 502. Terminal switching button; 6. First transmission assembly; 601. Linkage member; 602. Reversing member; 701. Contact guide groove one; 702. Contact guide groove two; 8. Switching mechanism; 801. First switching arm; 802. Second switching arm; 803. Elastic member. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0023] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0024] like Figures 1 to 4 As shown, the first embodiment of the present invention provides an anti-melting welding micro switch, comprising: Switch body 1; The first contact component 2 comprises: A first contact arm 201 connected to the normally closed terminal 101 of the switch body 1; The second contact arm 202 is connected to the current input terminal 102 of the switch body 1; The second contact component 3 comprises: The third contact arm 301 is located between the normally closed terminal 101 and the current output terminal 104; The fourth contact arm 302 is located between the normally open terminal 103 and the second current output terminal 105; The transducer assembly 4 comprises: A first contact terminal 401, a second contact terminal 402 and a capacitor 403; When the common terminal 106 of the switch body 1 is connected to the normally closed terminal 101: The first contact end 401 contacts the second contact arm 202; The second contact end 402 contacts the third contact arm 301; The capacitor 403 is connected in parallel to the normally closed circuit of the switch body 1; When the switching mechanism 8 of the switch body 1 fails: The third contact arm 301 contacts the fourth contact arm 302 under the external force F1 and is disconnected from the current output terminal 1 104 of the normally closed terminal 101 , and the fourth contact arm 302 is disconnected from the current output terminal 2 105 of the normally open terminal 103 ; At the same time, the first contact end 401 is switched to be connected with the first contact arm 201 under the action of the external force F2, and the second contact end 402 is switched to be connected with the fourth contact arm 302; The capacitor 403 is switched from being connected in parallel to being connected in series to the normally closed circuit of the switch body 1 .

[0025] In this embodiment, the anti-melting welding micro switch utilizes the parallel and series state switching of the capacitor 403 to achieve the buffering of instantaneous large current and the self-repair function of the contacts, thereby ensuring the reliability of the switch in the circuit.

[0026] Specifically, under normal conditions, the capacitor 403 of the transducer assembly 4 is connected in parallel in a normally closed circuit to buffer instantaneous large currents and protect the contacts. The specific process is as follows: The current enters from the current input terminal 102, and is conducted to the common terminal 106 through the switching mechanism 8. The common terminal 106 contacts the normally closed terminal 101, and the current flows out from the current output terminal 104 of the normally closed terminal 101, completing the main current path.

[0027] In addition, part of the current enters the capacitor 403 through the second contact arm 202 , and the capacitor 403 completes parallel charging through the path: current input terminal 102 → second contact arm 202 → capacitor 403 → third contact arm 301 → normally closed terminal 101 → current output terminal 104 .

[0028] The capacitor 403 buffers the instantaneous large current in the parallel state to prevent the contacts from melting and sticking due to excessive current.

[0029] When the contacts are stuck due to a transient high current and the switching mechanism 8 cannot be reset, the micro switch enters a self-repairing state and switches the capacitor 403 to a series mode for self-repair by applying an external force: The external force F1 acts on the third contact arm 301 , causing it to disconnect the current output terminal 104 of the normally closed terminal 101 and connect to the fourth contact arm 302 . Meanwhile, the fourth contact arm 302 disconnects from the current output terminal 2 105 of the normally open terminal 103 .

[0030] The external force F2 connects the first contact end 401 to the first contact arm 201 , and the second contact end 402 to the fourth contact arm 302 . The capacitor 403 switches from a parallel connection to a series connection state, forming a series discharge path with the normally closed circuit.

[0031] In the series state, capacitor 403 is connected in series to the normally closed circuit, and the current path is as follows: The current enters the micro switch from the current input terminal 102 and reaches the common terminal 106 through the switching mechanism 8. The current is conducted from the common terminal 106 to the normally closed terminal 101. The current flows from the normally closed terminal 101 to the third contact arm 301. The current flows from the third contact arm 301 to the fourth contact arm 302. The current flows through the fourth contact arm 302 to the second contact terminal 402. The current flows from the second contact terminal 402 to the capacitor 403, which is in a series state and begins to discharge. After the capacitor 403 is discharged, the current flows from the capacitor 403 to the first contact terminal 401. The current enters the first contact arm 201 from the first contact terminal 401. Finally, the current returns to the normally closed terminal 101 through the first contact arm 201, completing the current closed path.

[0032] In this current path, the reverse current formed by the discharge of capacitor 403 acts on the contact area of ​​the adhesion, generating local high temperature, causing the adhesion to melt and separate, thereby releasing the adhesion and achieving self-repair of the micro switch.

[0033] The present invention switches the capacitor 403 between parallel and series (reverse connection) states to achieve buffer protection for instantaneous large currents under normal working conditions to prevent contact melting; when the contacts are stuck, the contacts are self-repaired through reverse discharge to extend the life of the micro switch.

[0034] like Figure 2 As shown, in a specific embodiment, the housing of the switch body 1 includes a front plate 107, a middle plate 108 and a rear plate 109 coupled in sequence, so as to reasonably separate the functional components of the switch into different installation spaces.

[0035] This three-layer board combination design provides a solid support and can effectively isolate the installation areas of different components to avoid mutual interference.

[0036] The front plate 107 and the middle plate 108 are coupled to form a first installation space for accommodating a switching component and a terminal connection structure of the micro switch.

[0037] The first installation space includes: the switching mechanism 8 of the switch body 1 , the common terminal 106 , the normally closed terminal 101 and its current output terminal 1 104 , the normally open terminal 103 and its current output terminal 2 105 .

[0038] This layout enables the switching mechanism 8 and the terminal assembly to be concentrated in one place, which facilitates the switching operation of the current path and reduces the interference between the terminal assembly and other current-conducting components.

[0039] The middle plate 108 and the rear plate 109 are coupled to form a second installation space, which is mainly used to accommodate the current conduction components of the anti-melting welding micro switch, so that functions such as current conduction, switch protection and self-repair can be stably performed in an isolated area.

[0040] The second installation space includes: a first contact component 2 , a second contact component 3 and a transducer component 4 .

[0041] The multilayer board structure reasonably separates the switching components and the current conducting components of the switch, so that the functions of switch switching and current conducting are clearly separated, thereby avoiding the influence of electromagnetic interference and heat accumulation.

[0042] Through the coupling of the front plate 107, the middle plate 108, and the rear plate 109 and the reasonable division of the installation space, this embodiment further improves the stability, maintainability and reliability of the anti-welding microswitch, and provides structural support for stable operation in response to instantaneous large currents and self-repair processes.

[0043] In a specific embodiment, the first contact component 2 is a plate-like structure (with conductivity), and the first contact component 2 extends toward the rear plate 109 to form a conductive first contact arm 201 and a second contact arm 202. Specifically, the first contact component 2 has two ends in the height direction thereof facing the rear plate 109, that is, perpendicular to the aforementioned height direction, to form two mutually independent first contact arms 201 and second contact arms 202.

[0044] like Figure 3As shown, in a specific embodiment, the second contact component 3 is specifically two independent parts, which are recorded as a first contact part and a second contact part, wherein the first contact part is conductive and connected to the normally closed terminal 101, and this part extends a third contact arm 301. A second contact part is arranged below the first contact part, and the second contact part is connected to the normally open terminal 103, and extends a fourth contact arm 302. The third contact arm 301 and the fourth contact arm 302 are in a non-contact state in a normal state, and only under the influence of an external force F1, the third contact arm 301 and the fourth contact arm 302 will form a contact state, and the third contact arm 301 is disconnected from the current output terminal 1 104 of the normally closed terminal 101 (specifically, the two are switched from the contact state to the separation state), and the fourth contact arm 302 is disconnected from the current output terminal 2 105 of the normally open terminal 103 (specifically, the two are switched from the contact state to the separation state). Moreover, the external force F1 can be the force applied by the state switching button 501 of the switch body 1 to the third contact arm 301. Among them, the state switching button 501 is located in the middle plate 108 and the rear plate 109 to couple to form a second installation space and form a sliding connection therewith, and one end of the state switching button 501 extends out of the top end surface of the switch body 1, and the other end contacts the third contact arm 301 inside the second installation space.

[0045] When the common terminal 106 of the switch body 1 is connected to the normally closed terminal 101, the switch body 1 is in a normal working state. When the switching mechanism 8 of the switch body 1 fails, it means that the common terminal 106 cannot be switched to the normally open terminal 103 by pressing the switching mechanism 8.

[0046] like Figure 3 , Figure 4 , Figure 7 , Figure 8 and Fig.10 As shown, the second embodiment of the present invention provides an anti-melting welding micro switch, and on the basis of the above embodiment, the energy conversion component 4 includes: Conversion rod 404; The two rod end portions of the conversion rod 404 are conductive to form a first contact end 401 and a second contact end 402; Furthermore, the shaft portion of the conversion rod 404 is a hollow structure and has insulation properties; The wire 405 used for connecting to the pin of the capacitor 403 is connected to the first contact end 401 and the second contact end 402 respectively.

[0047] In this embodiment, the anti-melt welding micro switch realizes a more stable current conduction path and insulation performance by adding a conversion rod 404 on the basis of the first embodiment, and further improves the reliability of the anti-melt welding function.

[0048] Specifically, both ends of the conversion rod 404 are conductive structures, forming a first contact end 401 and a second contact end 402, respectively, to achieve conductive connection of current in different states. The first contact end 401 is connected to one end of the capacitor 403, and the second contact end 402 is connected to the other end of the capacitor 403, thereby ensuring that when the series or parallel connection of the capacitor 403 is switched, the current can smoothly pass through the conversion rod 404.

[0049] The shaft of the conversion rod 404 is hollow and made of insulating material. The hollow structure not only reduces the mass of the conversion rod 404, but also provides additional insulation protection for the safety of the internal circuit. This insulating design can effectively prevent the current from accidentally flowing out through the shaft and avoid short circuits. It ensures that the current only flows through the preset conductive path during the conversion process, thereby improving the accuracy of current control.

[0050] By introducing the conversion rod 404, the micro switch not only achieves more efficient current conduction during the series and parallel switching of the capacitor 403, but also ensures the insulation performance, greatly reducing the risk of current leakage. The conductive end of the conversion rod 404 is combined with the hollow insulation structure to further improve the stability and safety of the micro switch during instantaneous high current and self-repair processes, making the anti-welding function of the micro switch more reliable.

[0051] In a specific embodiment, the conversion rod 404 is an integral structure, and the rod body has a through hole for the wire 405 to pass through.

[0052] like Fig. 9 and Fig.10 As shown, in a specific embodiment, the conversion rod 404 is a split structure, specifically comprising a rod shaft 1 4041 and a rod shaft 2 4042, which are in sliding contact, and the rod shaft 1 4041 has a built-in spring, the rod shaft 1 4041 and the rod shaft 2 4042 are connected by the spring, and the wire 405 is connected to the conductive end of the rod shaft 2 4042.

[0053] In a specific embodiment, the two rod ends of the conversion rod 404 are divided into elastic structures to adapt to the dynamic switching process.

[0054] like Figure 3 , Figure 4 and Fig.11 As shown, the third embodiment of the present invention provides an anti-melting welding micro switch, and on the basis of the above embodiment, includes: A first transmission component 6, configured to transmit the external force F2 to the energy conversion component 4; The first transmission component 6 comprises: Linkage member 601 and reversing member 602; The linkage member 601 is connected to the switching mechanism 8 of the switch body 1; The reversing member 602 is connected to the linkage member 601; The linkage member 601 is controlled by the external force F2 applied to the switching mechanism 8, and drives the reversing member 602 to rotate a set angle; Furthermore, the conversion rod 404 is slidably connected to the switching member 602 and rotates synchronously with the switching member 602 to promote the switching of the contact positions of the first contact end 401 and the second contact end 402 .

[0055] In this embodiment, a first transmission component 6 is added to accurately transmit the external force F2 applied to the switching mechanism 8 to the conversion rod 404 of the transducer component 4. This design further optimizes the operating accuracy of the micro switch, ensures the switching stability of the capacitor 403 in different states, and realizes the efficiency and safety of the contact self-repair function.

[0056] Specifically, the first transmission component 6 includes a linkage member 601 and a switching member 602 , which are respectively connected to the switching mechanism 8 and the conversion rod 404 , so as to efficiently transmit the external force F2 to the transducer component 4 to trigger the switching of the capacitor 403 state.

[0057] The linkage member 601 is directly connected to the switching mechanism 8 of the micro switch, and can transmit the external force to the switching member 602. The switching member 602 cooperates with the linkage member 601 to accurately control the rotation of the conversion rod 404 by rotating at a set angle, thereby realizing the switching of the contact end of the conversion rod 404.

[0058] In a normal state, the switching mechanism 8 of the micro switch is in the initial position, and the capacitor 403 is connected in parallel to the normally closed circuit to absorb the impact when a transient large current passes through, thereby protecting the contacts from welding.

[0059] Since the first contact end 401 and the second contact end 402 of the conversion rod 404 are respectively connected to the second contact arm 202 and the third contact arm 301 , the capacitor 403 is charged in parallel, reducing the risk of current flowing directly to the contacts.

[0060] When the switching mechanism 8 fails and causes the contacts to melt and stick, an external force F2 is applied to trigger the first transmission component 6 to start, and the external force F2 is transmitted from the switching mechanism 8 to the conversion rod 404: the linkage member 601 drives the switching member 602 to rotate a certain angle, thereby pushing the conversion rod 404 to rotate, so as to change the connection position of the first contact end 401 and the second contact end 402, and switch the capacitor 403 from parallel to series.

[0061] At this time, capacitor 403 is discharged in series, and the concentrated current acts on the contact adhesion area, generating enough heat to melt and separate the adhesion contact area, completing self-repair.

[0062] In a specific embodiment, the external force F2 is a force applied by the terminal switching button 502 of the switch body 1. The terminal switching button 502 is located in the first installation space formed by the coupling of the front plate 107 and the middle plate 108 and is slidably connected thereto, and one end of the terminal switching button 502 extends out of the top end surface of the switch body 1, and the other end contacts the switching mechanism 8 inside the first installation space.

[0063] The fourth embodiment of the present invention provides an anti-melting welding micro switch, and based on the above embodiment, the linkage member 601 includes a linkage rod, one end of which is connected to the switching mechanism 8 of the switch body 1, and the other end is slidably connected to the housing of the switch body 1; Wherein, in the first stroke of the switching mechanism 8, the linkage rod remains stationary; Wherein, in the second stroke of the switching mechanism 8, the linkage rod moves following the switching mechanism 8; The reversing member 602 includes a gear 1 and a gear 2; Among them, gear one is connected to the linkage rod and is controlled by the displacement of the linkage rod to rotate at a set angle; Among them, gear 2 is meshed and connected with gear 1, and the conversion rod 404 is slidably connected to gear 2; The first stroke refers to the displacement distance required for the switching mechanism 8 of the switch body 1 to be pressed down to switch the common terminal 106 to contact with the normally closed terminal 101 or the normally open terminal 103; The second stroke refers to the displacement distance of the switching mechanism 8 of the switch body 1 beyond the first stroke.

[0064] In this embodiment, the structures of the linkage member 601 and the reversing member 602 are further optimized, and the response speed and self-repair accuracy of the switch are improved by adding a linkage rod, a gear transmission and a stroke control mechanism.

[0065] In this embodiment, the linkage member 601 is in the form of a linkage rod, one end of which is connected to the switching mechanism 8 of the micro switch, and the other end is slidably connected to the housing, so that the linkage rod can move freely within a certain range. An arc groove is provided on the housing to adapt to the movement trajectory of the linkage member 601.

[0066] When the switching mechanism 8 only needs to perform conventional opening and closing operations (for example, switching the common terminal 106 to contact the normally closed terminal 101 or the normally open terminal 103), the linkage rod remains stationary and does not affect the connection state of the capacitor 403. When the switching mechanism 8 exceeds the displacement distance of the first stroke, the linkage rod begins to move with the switching mechanism 8, triggering the state switching of the capacitor 403 from parallel to series, and entering the self-repair mode. When the displacement distance trigger condition of the first stroke is exceeded, the terminal switching button 502 is manually over-pressed to enter the second stroke, at which time the switching mechanism 8 undergoes a large deformation to drive the displacement of the linkage member 601.

[0067] Gear 1 is connected to the linkage rod and is controlled by the displacement of the linkage rod. When the switching mechanism 8 enters the second stroke and drives the linkage rod to move, gear 1 rotates synchronously. Gear 2 is meshed with gear 1, so that gear 2 rotates synchronously therewith and transmits motion to the conversion rod 404. This gear transmission design triggers the rotation of the conversion rod 404 during the second stroke, providing accurate and reliable control for the switching of the capacitor 403. Among them, gear 1 and gear 2 can be connected to the housing through a rotating shaft.

[0068] like Figure 7 and Figure 8 As shown, in the normal working state (first stroke), the switching mechanism 8 moves only within the first stroke, the linkage rod remains stationary, and the conversion rod 404 is maintained in a parallel state with the capacitor 403 to absorb instantaneous large current and protect the contacts from damage.

[0069] Self-repairing state (second stroke): When the switching mechanism 8 is subjected to further external force and enters the second stroke, the linkage rod begins to move and drives gear one to rotate. The rotation of gear one is transmitted to gear two, prompting the conversion rod 404 to rotate to a new state, switching the capacitor 403 to a series state, and the capacitor 403 begins to discharge to increase the current at the contact point and release the adhesion.

[0070] In a specific embodiment, gear 2 is connected to the conversion rod 404 via a sliding bearing to avoid motion interference.

[0071] like Figure 3 and Figure 4 As shown, the fifth embodiment of the present invention provides an anti-melting welding micro switch, and on the basis of the above embodiment, the first contact component 2 includes: The stopper 203 is connected between the first contact arm 201 and the second contact arm 202 and has insulation properties; The limiting member 203 forms a limiting groove 204, and the limiting groove 204 at least exposes the first contact arm 201 and the second contact arm 202; The first contact end 401 is slidably restricted in the limiting groove 204; Furthermore, the limiting groove 204 has insulation properties at least in the area between the first contact arm 201 and the second contact arm 202 .

[0072] In this embodiment, the sliding of the first contact end 401 is limited by the limiting member 203 to ensure the contact stability and insulation performance of the first contact assembly 2, thereby further improving the anti-welding effect and the service life of the micro switch.

[0073] The stopper 203 is fixedly installed between the first contact arm 201 and the second contact arm 202 and is made of insulating material, thereby effectively preventing the current from short-circuiting through the stopper 203 or interfering with the normal operation of the contact arm.

[0074] This insulating structure design enables the limiter 203 to not participate in the conduction during the current flow, while providing protection for the sliding contact, thereby improving the working safety of the micro switch.

[0075] The limiting member 203 is provided with a limiting groove 204 for guiding and protecting the first contact end 401 and the second contact end 402. The limiting groove 204 exposes at least part of the first contact arm 201 and the second contact arm 202 to facilitate the flow of current in normal operation.

[0076] The limiting groove 204 has an insulating property in the area between the first contact arm 201 and the second contact arm 202, which effectively prevents the arc effect or instantaneous large current from damaging the contact arm.

[0077] The first contact end 401 is slidably restricted in the limiting groove 204, ensuring that the movement range of the first contact end 401 is limited and will not deviate out of the contact range of the contact arm due to external force.

[0078] This design not only prevents the contact end from being dislocated due to vibration or friction, but also ensures the stability of the contact end during the switching process of the capacitor 403.

[0079] Normal working state: In the normal use state of the micro switch, the current flows through the exposed area of ​​the first contact arm 201 and the second contact arm 202, and the insulation of the limiter 203 prevents the current from flowing to an unexpected path. The design of the limiter groove 204 ensures that the first contact end 401 stays stably in the contact arm position, reducing the risk of poor contact caused by current fluctuations.

[0080] When the instantaneous large current causes the contact to stick and enter the self-repair mode, the limit groove 204 ensures that the position of the first contact end 401 does not shift, thereby ensuring that the reverse discharge current of the capacitor 403 is concentrated on the adhesion area. The insulation characteristics of the limiter 203 can effectively prevent high temperature or arc from interfering with other areas during the self-repair process.

[0081] like Figure 4 As shown, the sixth embodiment of the present invention provides an anti-melting welding micro switch, and on the basis of the above embodiments, the first contact arm 201 has a connecting terminal 2011; The connection terminal 2011 maintains contact connection with the normally closed terminal 101 .

[0082] In this embodiment, the design of the connecting terminal 2011 is further added. By setting the connecting terminal 2011 on the first contact arm 201, a long-term stable connection between the first contact arm 201 and the normally closed terminal 101 is achieved, thereby enhancing the conduction reliability and contact stability of the micro switch under instantaneous large current conditions.

[0083] The connecting terminal 2011 ensures that the first contact arm 201 always maintains conduction with the normally closed terminal 101 in a normal use state and a contact adhesion release state, thereby preventing poor contact caused by external vibration or current shock.

[0084] Through the stable connection of the connection terminal 2011 , the normally closed terminal 101 can always maintain contact with the first contact arm 201 when the capacitor 403 is switched, ensuring the continuity of the conductive path after the capacitor 403 is switched in the self-repairing mode.

[0085] This design reduces the risk of poor contact due to contact bounce or wear, and further improves the stability of current conduction in the micro switch.

[0086] Normal working state: During normal use, the connecting terminal 2011 stably connects the first contact arm 201 to the normally closed terminal 101, so that the current can be smoothly conducted from the normally closed terminal 101 to the first contact arm 201, maintaining the stability of the current flow in the normally closed state.

[0087] Self-repairing state: When the contact is stuck or melted, the micro switch enters the self-repairing state, and the capacitor 403 switches to the series connection. At this time, the connecting terminal 2011 continues to maintain the contact connection between the first contact arm 201 and the normally closed terminal 101, ensuring the continuity of the reverse discharge path of the capacitor 403, so that the capacitor 403 can release the charge in a concentrated manner, heat and release the sticking area.

[0088] In a specific implementation, the connection terminal 2011 is a conductive plate-shaped structure, which is always connected to the normally closed terminal 101 .

[0089] like Figure 7 and Figure 8 As shown, the seventh embodiment of the present invention provides an anti-melting welding micro switch, and on the basis of the above embodiments, the third contact arm 301 and the fourth contact arm 302 are elastic structures; The third contact arm 301 is controlled by the external force F1 and deforms and displaces away from the current output terminal 104 of the normally closed terminal 101; The fourth contact arm 302 is controlled by the contact force with the third contact arm 301 to deform and displace away from the second current output terminal 105 of the normally open terminal 103 .

[0090] In this embodiment, the third contact arm 301 and the fourth contact arm 302 are designed as elastic structures so that they can deform and displace under the external force F1, thereby ensuring contact and conduction between the two to achieve the reverse discharge path of the capacitor 403. At the same time, since the third contact arm 301 and the fourth contact arm 302 are disconnected from the current output end at this time, it is ensured that the current does not flow out from this end, thereby concentrating the reverse current for self-repair.

[0091] Specifically, the third contact arm 301 and the fourth contact arm 302 are both elastic structures, which allow controlled deformation under the action of external force, so as to ensure that they can reliably contact and conduct in the self-repairing state. This elastic structure design enables the third contact arm 301 and the fourth contact arm 302 to approach each other and maintain contact under the action of external force F1, providing a stable conduction path for the reverse connection of the capacitor 403. Under the action of external force F1, the third contact arm 301 is deformed, away from the current output terminal 104 of the normally closed terminal 101, and contacts the fourth contact arm 302. Through this design, the third contact arm 301 is disconnected from the current output terminal 104, ensuring that the current does not flow out from this end, but is discharged through the reverse connection path of the capacitor 403. The fourth contact arm 302 is deformed under the force of contact with the third contact arm 301, away from the current output terminal 2 105 of the normally open terminal 103. The fourth contact arm 302 is disconnected from the second current output terminal 105, further ensuring that the current is derived from the reverse connection path of the capacitor 403 instead of flowing out from the conventional output terminal, thereby concentrating the reverse current to solve the contact sticking problem.

[0092] Self-repairing state (capacitor 403 is reversely connected and discharged): when the switching mechanism 8 fails due to contact adhesion, an external force F1 acts on the third contact arm 301 , causing it to deform and contact the fourth contact arm 302 .

[0093] Since the third contact arm 301 is disconnected from the current output terminal 104 and the fourth contact arm 302 is disconnected from the current output terminal 2 105, the current will not flow out from these terminals but will be concentrated on the reverse connection path, ensuring that the discharge process of the capacitor 403 can effectively act on the adhesion area, generating local heating to melt the adhesion area and achieve self-repair.

[0094] In a specific embodiment, the third contact arm 301 is a groove that is sunken toward the fourth contact arm 302, and the inner wall of the groove contacts the state switching button 501. The fourth contact arm 302 is a protrusion that protrudes toward the third contact arm 301. This structural form is used to allow the two to contact with a small deformation displacement. The external force F1 is transmitted to the third contact arm 301 through the state switching button 501.

[0095] like Figure 4 As shown, the eighth embodiment of the present invention provides an anti-melting welding micro switch, and on the basis of the above embodiment, the third contact arm 301 forms a contact guide groove 701; The fourth contact arm 302 forms a second contact guide groove 702; Wherein, when the capacitor 403 is connected in series, the second contact end 402 is in contact with the contact guide groove 1 701; When the capacitor 403 is in parallel connection, the second contact end 402 is in contact with the second contact groove 702 .

[0096] In this embodiment, by providing the contact guide groove 1 701 and the contact guide groove 2 702 on the third contact arm 301 and the fourth contact arm 302, the switching of the capacitor 403 between the series connection and the parallel connection is made more reliable and accurate. This structure ensures that the second contact end 402 can contact with a specific guide groove in different states, thereby controlling the connection mode of the capacitor 403 and realizing the self-repair function.

[0097] The contact guide groove 1 701 is provided on the third contact arm 301, and is used to contact the second contact end 402 when the capacitor 403 is in series connection. Through the contact guide groove 1 701, the second contact end 402 can form a reliable reverse discharge path when the capacitor 403 is in series connection, and concentrate the current on the adhesion area.

[0098] The second contact guide groove 702 is provided on the fourth contact arm 302, and is used to contact the second contact end 402 when the capacitor 403 is in a parallel state. When the capacitor 403 is in a parallel state, the second contact guide groove 702 ensures that the capacitor 403 can be charged through the parallel path, thereby absorbing instantaneous large current and protecting the contact from current shock.

[0099] By designing the contact guide groove 1 701 and the contact guide groove 2 702 , the second contact end 402 can stably switch to connect to different contact guide grooves in the self-repairing mode, thereby ensuring the connection accuracy of the capacitor 403 in the series and parallel states.

[0100] This contact guide groove design ensures that the capacitor 403 will not cause the current path to be interrupted due to poor contact during the switching process, thereby enhancing the stability of the micro switch.

[0101] By providing the contact guide groove 1 701 and the contact guide groove 2 702 , the micro switch of this embodiment has higher accuracy and reliability in switching the capacitor 403 .

[0102] On the other hand, restrictions and constraints on the position of the second contact terminal 402 are provided, further improving the stability of the connection and the switching reliability of the capacitor 403.

[0103] The structure of the contact groove 1 701 strictly limits the position of the second contact end 402 , ensuring that the second contact end 402 can only contact the groove 1 701 at a predetermined position, thereby achieving accurate series connection of the capacitor 403 .

[0104] This restriction prevents the second contact end 402 from deviating from the contact guide groove 701 due to vibration or external force during reverse discharge, thereby ensuring that the current flows through the adhesion area to perform self-repair.

[0105] Likewise, the second contact groove 702 imposes a spatial constraint on the second contact end 402, ensuring that it always stays at a specific position of the second contact groove 702 in the parallel state, so that the capacitor 403 can be accurately connected in parallel in the normally closed circuit.

[0106] This structure prevents the second contact end 402 from accidentally deviating under a large current impact and causing poor contact, thereby ensuring that the parallel path of the capacitor 403 is always stable, fully absorbing the large current impact and protecting the contact.

[0107] like Figure 5 and Figure 6 As shown, the ninth embodiment of the present invention provides an anti-melting welding micro switch, and on the basis of the above embodiment, the switching mechanism 8 of the switch body 1 includes: A first switching arm 801 having an end N1 and an end N2; A second switching arm 802 having an end M1 and an end M2; The end N1 and the end M2 are connected by an elastic member 803; The end N2 is fixedly connected to the housing; The end M1 is in sliding contact with the current input end 102; Furthermore, the end N1 is elastic; Furthermore, the end M2 is connected to the common terminal 106 .

[0108] In this embodiment, the switching mechanism 8 of the anti-melting welding micro switch is mainly used to realize the switching of the common terminal 106 between the normally closed terminal 101 and the normally open terminal 103. The switching mechanism 8 adopts a structure of a first switching arm 801 and a second switching arm 802 connected with an elastic member 803, so that reliable switching can be achieved when the circuit is in normal use.

[0109] The switching mechanism 8 realizes the switching of the common terminal 106 between the normally closed terminal 101 and the normally open terminal 103 through the combined structure of the first switching arm 801 and the second switching arm 802 .

[0110] In normal operation, the switching mechanism 8 connects the common terminal 106 and the normally closed terminal 101 under the action of the elastic member 803 , or switches to connect the normally open terminal 103 by pressing the terminal switching button 502 .

[0111] When the terminals are not adhered or melted, the terminal switching button 502 and the state switching button 501 are pressed at the same time, that is, the external force F1 and the external force F2. When the adhesion position is melted, since the terminal switching button 502 is always in a pressed state, it is helpful to separate the adhesion of the common terminal 106. This design ensures that in the case of contact adhesion, sufficient separation force is generated to separate the terminals and restore normal switch function.

[0112] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0113] The above embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A micro switch for preventing melting welding, characterized in that: include: Switch body (1); The first contact component (2) comprises: A first contact arm (201) connected to a normally closed terminal (101) of the switch body (1); A second contact arm (202) connected to a current input terminal (102) of the switch body (1); The second contact component (3) comprises: A third contact arm (301) is located between the normally closed terminal (101) and the first current output terminal (104); A fourth contact arm (302) is located between the normally open terminal (103) and the second current output terminal (105); The transducer assembly (4) comprises: A first contact terminal (401), a second contact terminal (402) and a capacitor (403); Wherein, when the common terminal (106) of the switch body (1) is connected to the normally closed terminal (101): The first contact end (401) contacts the second contact arm (202); The second contact end (402) contacts the third contact arm (301); The capacitor (403) is connected in parallel to the normally closed circuit of the switch body (1); Wherein, when the switching mechanism (8) of the switch body (1) fails: The third contact arm (301) contacts the fourth contact arm (302) under the action of an external force F1 and is disconnected from the current output terminal 1 (104) of the normally closed terminal (101), and the fourth contact arm (302) is disconnected from the current output terminal 2 (105) of the normally open terminal (103); At the same time, under the action of an external force F2, the first contact end (401) switches to connect with the first contact arm (201), and the second contact end (402) switches to connect with the fourth contact arm (302); The capacitor (403) is switched from being connected in parallel to being connected in series to a normally closed circuit of the switch body (1).

2. The anti-melting welding micro switch according to claim 1, characterized in that: The energy conversion component (4) comprises: Switching rod (404); Wherein, the two rod end portions of the conversion rod (404) are conductive to form the first contact end (401) and the second contact end (402); Furthermore, the shaft portion of the conversion rod (404) is a hollow structure and has insulating properties; Wherein, the wire (405) used for connecting to the pin of the capacitor (403) is connected to the first contact end (401) and the second contact end (402) respectively.

3. The anti-melting welding micro switch according to claim 2, characterized in that: include: A first transmission component (6) configured to transmit the external force F2 to the energy conversion component (4); The first transmission component (6) comprises: A linkage member (601) and a reversing member (602); The linkage member (601) is connected to the switching mechanism (8) of the switch body (1); The reversing member (602) is connected to the linkage member (601); The linkage member (601) is controlled by an external force F2 applied to the switching mechanism (8) to drive the reversing member (602) to rotate at a set angle; Furthermore, the conversion rod (404) is slidably connected to the switching member (602) and rotates synchronously with the switching member (602) to promote the switching of the contact positions of the first contact end (401) and the second contact end (402).

4. The anti-melting welding micro switch according to claim 3, characterized in that: The linkage member (601) comprises a linkage rod, one end of which is connected to the switching mechanism (8) of the switch body (1), and the other end of which is slidably connected to the housing of the switch body (1); Wherein, in the first stroke of the switching mechanism (8), the linkage rod remains stationary; Wherein, in the second stroke of the switching mechanism (8), the linkage rod moves following the switching mechanism (8); The reversing member comprises a gear 1 and a gear 2; Wherein, the gear 1 is connected to the linkage rod and is controlled by the displacement of the linkage rod to rotate at a set angle; Wherein, the second gear is meshedly connected with the first gear, and the conversion rod (404) is slidably connected to the second gear; The first stroke refers to the displacement distance required for the switching mechanism (8) of the switch body (1) to be pressed down to switch the common terminal (106) into contact with the normally closed terminal (101) or the normally open terminal (103); The second stroke refers to the displacement distance of the switching mechanism (8) of the switch body (1) beyond the first stroke.

5. The anti-melting welding micro switch according to claim 4, characterized in that: The first contact component (2) comprises: A limiting member (203) connected between the first contact arm (201) and the second contact arm (202) and having insulation properties; Wherein, the limiting member (203) forms a limiting groove (204), and the limiting groove (204) at least exposes the first contact arm (201) and the second contact arm (202); Wherein, the first contact end (401) is slidably restricted in the limiting groove (204); Furthermore, the limiting groove (204) has insulation properties at least in the area between the first contact arm (201) and the second contact arm (202).

6. The anti-melting welding micro switch according to claim 5, characterized in that: The first contact arm (201) has a connecting terminal (2011); The connection terminal (2011) maintains contact connection with the normally closed terminal (101).

7. The anti-melting welding micro switch according to claim 6, characterized in that: The third contact arm (301) and the fourth contact arm (302) are elastic structures; The third contact arm (301) is controlled by the external force F1 to deform and displace away from the current output terminal 1 (104) of the normally closed terminal (101); The fourth contact arm (302) is controlled by the contact force with the third contact arm (301) to deform and displace the second current output terminal (105) away from the normally open terminal (103).

8. The anti-melting welding micro switch according to claim 7, characterized in that: The third contact arm (301) forms a contact guide groove 1 (701); The fourth contact arm (302) forms a second contact guide groove (702); Wherein, when the capacitor (403) is in a series connection state, the second contact end (402) is in contact with the first contact guide groove (701); Wherein, when the capacitor (403) is in a parallel state, the second contact end (402) is in contact with the second contact guide groove (702).

9. The anti-melting welding micro switch according to claim 1, characterized in that: The housing of the switch body (1) comprises: A front plate (107), a middle plate (108) and a rear plate (109) coupled in sequence; Wherein, the front plate (107) and the middle plate (108) are coupled to form a first installation space; Wherein, the middle plate (108) and the rear plate (109) are coupled to form a second installation space; Furthermore, the switching mechanism (8), the common terminal (106), the normally closed terminal (101) and the first current output terminal (104) thereof, and the normally open terminal (103) and the second current output terminal (105) thereof of the switch body (1) are placed in the first installation space; Furthermore, the first contact component (2), the second contact component (3), and the transducer component (4) are placed in the second installation space.

10. The anti-melting welding micro switch according to claim 1, characterized in that: The switching mechanism (8) of the switch body (1) comprises: A first switching arm (801) having an end N1 and an end N2; A second switching arm (802) having an end M1 and an end M2; The end N1 and the end M2 are connected via an elastic member (803); The end N2 is fixedly connected to the housing; The end M1 is in sliding contact with the current input end (102); Furthermore, the end portion N1 is elastic; Furthermore, the end M2 is connected to the common terminal (106).

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