A kind of anti-melting welding micro switch

Abstract

The present invention provides an anti-melting welding micro switch, which belongs to the technical field of micro switches. It includes: a switch body; a first contact component includes: a first contact arm connected to the normally closed terminal of the switch body; a second contact arm connected to the current input end of the switch body; a second contact component includes a third contact arm located between the normally closed terminal and its current output terminal one; a fourth contact arm located between the normally open terminal and its current output terminal two; a transducer component includes: a first contact terminal, a second contact terminal and a capacitor. By switching the capacitor between parallel and series states, buffer protection of instantaneous large currents is achieved under normal working conditions to prevent contacts from melting; when contacts are adhered, the contacts are self-repaired by reverse discharge to extend the life of the micro switch.

Description

Technical Field

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

[0002] In many applications, microswitches serve as critical control components, widely used in circuits requiring reliable switching. However, in actual use, microswitches often face the passage of large, instantaneous currents. This sudden increase in current can cause strong arcing between the microswitch contacts. This arcing can cause the contact surface temperature to rise sharply, leading to partial melting of the contact material and resulting in adhesion.

[0003] Once the contacts melt and stick, the spring return mechanism of the microswitch cannot pull the contacts back to their original position, causing them to lose their opening and closing function, directly affecting the normal operation of the circuit and even causing the switch to malfunction. This not only damages the microswitch but can also cause the control system to interrupt operation. Therefore, when designing circuits containing microswitches, special consideration must be given to the effects of transient high currents on the switch contacts.

[0004] It's important to note that while adding an overcurrent protection device can reduce the impact of high current on the microswitch, contact melting can still occur when instantaneous high current is unavoidable. If high current continues to flow through the circuit, the contacts will be severely burned, resulting in not only loss of switch function but also the need to replace the microswitch assembly, increasing maintenance costs.

[0005] Therefore, the design background of this invention only addresses the problem of contact melting caused by instantaneous high current, rather than the situation of excessive current for a long time. By designing an anti-melting micro switch, it can effectively prevent the contacts from melting and sticking when a large current flows through it, thereby ensuring that the micro switch can operate normally and reliably in the circuit. Summary of the Invention

[0006] Based on this, it is necessary to provide an anti-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:

[0008] An anti-welding micro switch, comprising:

[0009] Switch body;

[0010] A first contact assembly comprising:

[0011] a first contact arm connected to a normally closed terminal of the switch body;

[0012] a second contact arm connected to a current input terminal of the switch body;

[0013] The second contact assembly comprises:

[0014] a third contact arm, located between the normally closed terminal and the first current output terminal thereof;

[0015] a fourth contact arm, located between the normally open terminal and the second current output terminal thereof;

[0016] Transducer assembly, including:

[0017] a first contact terminal, a second contact terminal, and a capacitor;

[0018] Wherein, when the common terminal of the switch body is connected to the normally closed terminal:

[0019] The first contact end contacts the second contact arm;

[0020] The second contact end contacts the third contact arm;

[0021] The capacitor is connected in parallel to the normally closed circuit of the switch body;

[0022] Wherein, when the switching mechanism of the switch body fails:

[0023] 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;

[0024] At the same time, the first contact end switches to connect with the first contact arm under the action of the external force F2, and the second contact end switches to connect with the fourth contact arm;

[0025] The capacitor is switched from being connected in parallel to being connected in series to a normally closed circuit of the switch body.

[0026] Preferably, the energy conversion component includes:

[0027] conversion rod;

[0028] Wherein, the two rod end portions of the conversion rod are conductive to form the first contact end and the second contact end;

[0029] Furthermore, the shaft of the conversion rod is a hollow structure and has insulating properties;

[0030] The wires used to connect to the pins of the capacitor are connected to the first contact end and the second contact end respectively.

[0031] Preferably, it includes:

[0032] a first transmission component, configured to transmit the external force F2 to the energy conversion component;

[0033] The first transmission component includes:

[0034] Linkage parts and reversing parts;

[0035] The linkage member is connected to the switching mechanism of the switch body;

[0036] The reversing member is connected to the linkage member;

[0037] The linkage member is controlled by the external force F2 applied to the switching mechanism, and drives the reversing member to rotate a set angle;

[0038] Furthermore, the conversion rod is slidably connected to the reversing member and rotates synchronously with the reversing member to promote switching of the contact positions of the first contact end and the second contact end.

[0039] 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;

[0040] Wherein, in the first stroke of the switching mechanism, the linkage rod remains stationary;

[0041] Wherein, under the second stroke of the switching mechanism, the linkage rod follows the displacement of the switching mechanism;

[0042] The reversing member includes gear 1 and gear 2;

[0043] Wherein, the gear 1 is connected to the linkage rod and rotates at a set angle under the control of the displacement of the linkage rod;

[0044] wherein the gear 2 is meshedly connected to the gear 1, and the conversion rod is slidably connected to the gear 2;

[0045] 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 into contact with the normally closed terminal or the normally open terminal;

[0046] The second stroke refers to the displacement distance of the switching mechanism of the switch body exceeding the first stroke.

[0047] Preferably, the first contact component comprises:

[0048] a limiting member connected between the first contact arm and the second contact arm and having insulation properties;

[0049] Wherein, the limiting member forms a limiting groove, and the limiting groove exposes at least the first contact arm and the second contact arm;

[0050] Wherein, the first contact end is slidably restricted in the limiting groove;

[0051] Furthermore, the limiting groove has insulation properties at least in a region between the first contact arm and the second contact arm.

[0052] Preferably, the first contact arm has a connecting terminal;

[0053] The connection terminal maintains contact connection with the normally closed terminal.

[0054] Preferably, the third contact arm and the fourth contact arm are elastic structures;

[0055] 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;

[0056] 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.

[0057] Preferably, the third contact arm forms a contact guide groove 1;

[0058] The fourth contact arm forms a second contact guide groove;

[0059] Wherein, when the capacitors are in series connection, the second contact end contacts the first contact guide groove;

[0060] Wherein, when the capacitors are in parallel connection state, the second contact end contacts the second contact guide groove.

[0061] Preferably, the housing of the switch body comprises:

[0062] A front plate, a middle plate, and a rear plate coupled in sequence;

[0063] Wherein, the front plate and the middle plate are coupled to form a first installation space;

[0064] Wherein, the middle plate and the rear plate are coupled to form a second installation space;

[0065] Furthermore, the switching mechanism, common terminal, normally closed terminal and current output terminal 1 thereof, normally open terminal and current output terminal 2 thereof of the switch body are placed in the first installation space;

[0066] Furthermore, the first contact component, the second contact component, and the transducer component are placed in the second installation space.

[0067] Preferably, the switching mechanism of the switch body includes:

[0068] a first switching arm having an end N1 and an end N2;

[0069] a second switching arm having an end M1 and an end M2;

[0070] The end portion N1 and the end portion M2 are connected by an elastic member;

[0071] The end portion N2 is fixedly connected to the housing;

[0072] The end M1 is in sliding contact with the current input end;

[0073] Furthermore, the end portion N1 is elastic;

[0074] Furthermore, the end portion M2 is connected to the common terminal.

[0075] The beneficial effects of the present invention are:

[0076] 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 performs self-repair by applying external force to switch the capacitor to the series mode: 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 discharge of the capacitor acts concentratedly on the contact area where the contact is stuck, generating local high temperature, causing the sticking to melt and separate, thereby releasing the sticking and achieving self-repair of the micro switch.

[0077] The present invention switches capacitors between parallel and series (reverse) states to achieve buffering protection against instantaneous large currents under normal working conditions, preventing contact melting; and self-repairs contacts through reverse discharge when contacts stick, thereby extending the life of the micro switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] Figure 1 A perspective view of an anti-welding micro switch according to an embodiment of the present invention;

[0079] Figure 2 for Figure 1 Split diagram of the structure shown;

[0080] Figure 3 This is a perspective view of a first contact assembly, a second contact assembly, and a transducer assembly in an anti-melting welding micro switch according to an embodiment of the present invention;

[0081] Figure 4This is a second perspective view of the first contact assembly, the second contact assembly, and the transducer assembly in the anti-melting welding micro switch according to an embodiment of the present invention;

[0082] Figure 5 A side view of an anti-welding micro switch according to an embodiment of the present invention;

[0083] Figure 6 for Figure 5 A cross-sectional view of the structure shown along the AA direction;

[0084] Figure 7 for Figure 5 One of the cross-sectional views of the structure shown along direction BB (capacitors in parallel);

[0085] Figure 8 for Figure 5 The second cross-sectional view of the structure along the BB direction (capacitors are in series);

[0086] Figure 9 This is a schematic structural diagram of a transducer assembly in an anti-melting welding micro switch according to an embodiment of the present invention;

[0087] Figure 10 for Figure 9 A cross-sectional view of the structure shown along the CC direction;

[0088] Figure 11 This is a schematic diagram of the connection between the linkage member and the first switching arm in an anti-welding micro switch according to an embodiment of the present invention.

[0089] in:

[0090] 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 slot; 3. Second contact assembly; 301. Third contact arm; 302. Fourth contact arm ; 4. Transducer component; 401. First contact end; 402. Second contact end; 403. Capacitor; 404. Converter rod; 4041. Rod body one; 4042. Rod body two; 405. Wire; 501. Status switch button; 502. Terminal switch button; 6. First transmission component; 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

[0091] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be 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 intended to limit the present invention.

[0092] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or component being referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0093] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0094] like Figures 1 to 4 As shown, the first embodiment of the present invention provides an anti-welding micro switch, comprising:

[0095] Switch body 1;

[0096] The first contact component 2 includes:

[0097] The first contact arm 201 is connected to the normally closed terminal 101 of the switch body 1;

[0098] The second contact arm 202 is connected to the current input terminal 102 of the switch body 1;

[0099] The second contact component 3 includes:

[0100] The third contact arm 301 is located between the normally closed terminal 101 and the current output terminal 104;

[0101] The fourth contact arm 302 is located between the normally open terminal 103 and the second current output terminal 105;

[0102] The transducer assembly 4 includes:

[0103] A first contact terminal 401, a second contact terminal 402 and a capacitor 403;

[0104] When the common terminal 106 of the switch body 1 is connected to the normally closed terminal 101:

[0105] The first contact end 401 contacts the second contact arm 202;

[0106] The second contact end 402 contacts the third contact arm 301;

[0107] The capacitor 403 is connected in parallel to the normally closed circuit of the switch body 1;

[0108] When the switching mechanism 8 of the switch body 1 fails:

[0109] Under the action of external force F1, the third contact arm 301 contacts the fourth contact arm 302 and is disconnected from the current output terminal 104 of the normally closed terminal 101. The fourth contact arm 302 is disconnected from the current output terminal 2 105 of the normally open terminal 103.

[0110] At the same time, the first contact end 401 switches to connect with the first contact arm 201 under the action of the external force F2, and the second contact end 402 switches to connect with the fourth contact arm 302;

[0111] 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 .

[0112] In this embodiment, the anti-welding micro switch utilizes the parallel and series state switching of the capacitor 403 to achieve buffering of instantaneous large currents and self-repairing functions of the contacts, thereby ensuring the reliability of the switch in the circuit.

[0113] Specifically, under normal conditions, the capacitor 403 of the transducer assembly 4 is connected in parallel to the normally closed circuit to buffer instantaneous large currents and protect the contacts. The specific process is as follows:

[0114] Current enters from the current input terminal 102, is conducted to the common terminal 106 through the switching mechanism 8, and the common terminal 106 contacts the normally closed terminal 101. The current flows out from the current output terminal 104 of the normally closed terminal 101, completing the main current path.

[0115] In addition, part of the current enters the capacitor 403 through the second contact arm 202 , and the capacitor 403 is charged in parallel 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 .

[0116] The capacitor 403 buffers the instantaneous large current in the parallel state to prevent the contacts from melting and sticking due to excessive current.

[0117] When the contacts stick 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:

[0118] The external force F1 acts on the third contact arm 301 , disconnecting the current output terminal 104 of the normally closed terminal 101 and connecting it to the fourth contact arm 302 . Meanwhile, the fourth contact arm 302 disconnects the current output terminal 2 105 of the normally open terminal 103 .

[0119] The external force F2 connects the first contact terminal 401 to the first contact arm 201 and the second contact terminal 402 to the fourth contact arm 302 . The capacitor 403 switches from a parallel connection to a series connection, forming a series discharge path with the normally closed circuit.

[0120] In the series state, capacitor 403 is connected in series to the normally closed circuit, and the current path is as follows:

[0121] Current enters the microswitch from current input terminal 102 and passes through switching mechanism 8 to common terminal 106. Current is then conducted from common terminal 106 to normally closed terminal 101. Current then flows from normally closed terminal 101 to third contact arm 301. Current then flows from third contact arm 301 to fourth contact arm 302. Current then passes through fourth contact arm 302 to second contact terminal 402. Current then flows from second contact terminal 402 to capacitor 403, which is now in series connection and begins to discharge. After capacitor 403 discharges, current then flows from capacitor 403 to first contact terminal 401. From first contact terminal 401, current then enters first contact arm 201. Ultimately, current returns to normally closed terminal 101 through first contact arm 201, completing the current closed path.

[0122] 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.

[0123] The present invention switches the capacitor 403 between parallel and series (reverse) states to achieve buffer protection for instantaneous large currents under normal working conditions to prevent contact melting; when the contacts are stuck, the reverse discharge self-repairs the contacts, thereby extending the life of the micro switch.

[0124] 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.

[0125] This three-layer board combination design provides stable support and effectively isolates the installation areas of different components to avoid mutual interference.

[0126] 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.

[0127] 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 first current output terminal 104 , the normally open terminal 103 and its second current output terminal 105 .

[0128] This layout enables the switching mechanism 8 and the terminal assembly to be concentrated in one place, facilitating the switching operation of the current path while reducing interference between the terminal assembly and other current-conducting components.

[0129] 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-welding micro switch, so that functions such as current conduction, switch protection and self-repair can be carried out stably in an isolated area.

[0130] The second installation space includes: a first contact component 2 , a second contact component 3 and a transducer component 4 .

[0131] The multilayer board structure rationally separates the switching components and current-conducting components of the switch, so that the functions of switch switching and current conduction are clearly separated, thereby avoiding the influence of electromagnetic interference and heat accumulation.

[0132] Through the coupling of the front plate 107, the middle plate 108, and the rear plate 109 and the reasonable separation of the installation space, this embodiment further improves the stability, maintainability and reliability of the anti-welding micro switch, and provides structural support for stable operation in response to instantaneous large currents and self-repair processes.

[0133] In one embodiment, the first contact assembly 2 is a plate-shaped structure (having electrical conductivity) that extends toward the rear plate 109 to form a conductive first contact arm 201 and a conductive second contact arm 202. Specifically, the first contact assembly 2 has two ends in the height direction thereof facing toward the rear plate 109, i.e., perpendicular to the aforementioned height direction, forming two independent first contact arms 201 and second contact arms 202.

[0134] like Figure 3As shown, in one embodiment, the second contact assembly 3 is comprised of two separate parts, designated as a first contact portion and a second contact portion. The first contact portion is conductive and connected to the normally closed terminal 101. A third contact arm 301 extends from this portion. A second contact portion is provided below the first contact portion. The second contact portion is connected to the normally open terminal 103 and extends from a fourth contact arm 302. The third and fourth contact arms 301 and 302 are normally non-contacting. Only under the influence of an external force F1 do the third and fourth contact arms 301 and 302 come into contact. The third contact arm 301 is disconnected from the current output terminal 104 of the normally closed terminal 101 (specifically, the two switch from contact to separation), and the fourth contact arm 302 is disconnected from the current output terminal 2 105 of the normally open terminal 103 (specifically, the two switch from contact to separation). 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 coupled to form a second installation space and is slidably connected thereto, 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.

[0135] 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.

[0136] like Figure 3 , Figure 4 , Figure 7 , Figure 8 and Figure 10 As shown, the second embodiment of the present invention provides an anti-welding micro switch, and based on the above embodiment, the transducer component 4 includes:

[0137] conversion rod 404;

[0138] The two rod ends of the conversion rod 404 are conductive to form a first contact end 401 and a second contact end 402;

[0139] Furthermore, the shaft portion of the conversion rod 404 is a hollow structure and has insulating properties;

[0140] 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.

[0141] In this embodiment, the anti-melting 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, further improving the reliability of the anti-melting welding function.

[0142] Specifically, both ends of the switching 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. This ensures that current can flow smoothly through the switching rod 404 when the capacitor 403 switches between series and parallel connection.

[0143] The shaft of the conversion rod 404 is hollow and made of insulating material. This hollow structure not only reduces the weight of the conversion rod 404 but also provides additional insulation for the safety of the internal circuitry. This insulation effectively prevents accidental leakage of current through the shaft and avoids short circuits. This ensures that current flows only through the pre-defined conductive path during the conversion process, thereby improving the accuracy of current control.

[0144] By introducing switching rod 404, the microswitch not only achieves more efficient current conduction during the series and parallel switching of capacitors 403, but also ensures insulation performance, significantly reducing the risk of current leakage. The conductive end of switching rod 404, combined with the hollow insulation structure, further enhances the stability and safety of the microswitch during transient high currents and self-healing processes, making the microswitch's anti-welding function more reliable.

[0145] 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.

[0146] like Figure 9 and Figure 10 As shown, in one embodiment, the conversion rod 404 is a split structure, specifically comprising a first rod 4041 and a second rod 4042, which are in sliding contact with each other. The first rod 4041 has a built-in spring, and the first rod 4041 and the second rod 4042 are connected by the spring. The wire 405 is connected to the conductive end of the second rod 4042.

[0147] In a specific embodiment, the two ends of the conversion rod 404 are divided into elastic structures to adapt to the dynamic switching process.

[0148] like Figure 3 , Figure 4 and Figure 11 As shown, the third embodiment of the present invention provides an anti-welding micro switch, and on the basis of the above embodiment, includes:

[0149] A first transmission component 6 is configured to transmit the external force F2 to the energy conversion component 4;

[0150] The first transmission component 6 includes:

[0151] Linkage member 601 and reversing member 602;

[0152] The linkage member 601 is connected to the switching mechanism 8 of the switch body 1;

[0153] The reversing member 602 is connected to the linkage member 601;

[0154] 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;

[0155] Furthermore, the conversion rod 404 is slidably connected to the reversing member 602 and rotates synchronously with the reversing member 602 to promote switching of the contact positions of the first contact end 401 and the second contact end 402 .

[0156] 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 assembly 4. This design further optimizes the operating accuracy of the micro switch, ensures the stable switching of the capacitor 403 in different states, and realizes the efficiency and safety of the contact self-repair function.

[0157] Specifically, the first transmission component 6 includes a linkage member 601 and a reversing 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.

[0158] The linkage 601 is directly connected to the switching mechanism 8 of the micro switch, and can transmit the external force to the reversing member 602. The reversing member 602 cooperates with the linkage 601 to accurately control the rotation of the conversion rod 404 by rotating at a set angle, thereby switching the contact end of the conversion rod 404.

[0159] 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.

[0160] Since the first contact end 401 and the second contact end 402 of the switching rod 404 are connected to the second contact arm 202 and the third contact arm 301 respectively, the capacitor 403 is charged in parallel, reducing the risk of current flowing directly to the contacts.

[0161] 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 part 601 drives the reversing part 602 to rotate a certain angle, and then pushes 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 state.

[0162] At this time, the 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.

[0163] In one 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 a first mounting space formed by the coupling of the front plate 107 and the middle plate 108 and is slidably connected thereto. One end of the terminal switching button 502 extends beyond the top end surface of the switch body 1, and the other end contacts the switching mechanism 8 within the first mounting space.

[0164] A fourth embodiment of the present invention provides an anti-welding micro switch. 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 of which is slidably connected to the housing of the switch body 1.

[0165] In the first stroke of the switching mechanism 8, the linkage rod remains stationary;

[0166] In the second stroke of the switching mechanism 8, the linkage rod moves following the switching mechanism 8;

[0167] The reversing member 602 includes gear 1 and gear 2;

[0168] Among them, gear 1 is connected to the linkage rod and is controlled by the displacement of the linkage rod to rotate at a set angle;

[0169] The gear 2 is meshed with the gear 1, and the conversion rod 404 is slidably connected to the gear 2;

[0170] 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;

[0171] The second stroke refers to the displacement distance of the switching mechanism 8 of the switch body 1 exceeding the first stroke.

[0172] 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, gear transmission and stroke control mechanism.

[0173] 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 in the housing to accommodate the movement trajectory of the linkage member 601.

[0174] When switching mechanism 8 only needs to perform routine opening and closing operations (e.g., switching common terminal 106 into contact with normally closed terminal 101 or normally open terminal 103), the linkage rod remains stationary, without affecting the connection status of capacitor 403. When switching mechanism 8 exceeds the displacement distance of the first stroke, the linkage rod begins to move with switching mechanism 8, triggering the state of capacitor 403 to switch from parallel to series connection, entering self-repair mode. When the displacement distance trigger condition exceeds the first stroke, the terminal switching button 502 is manually over-pressed to enter the second stroke, at which point switching mechanism 8 undergoes significant deformation, driving the displacement of linkage member 601.

[0175] Gear 1 is connected to the linkage rod and is controlled by the linkage rod's displacement. When the switching mechanism 8 enters the second stroke and drives the linkage rod to move, Gear 1 rotates synchronously. Gear 2 meshes with Gear 1, causing Gear 2 to rotate synchronously with it, transmitting the motion to the switching rod 404. This gear transmission design triggers the rotation of the switching rod 404 during the second stroke, providing precise and reliable control for the switching of capacitor 403. Gears 1 and 2 can be connected to the housing via a rotating shaft.

[0176] 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.

[0177] Self-repair 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 1 to rotate. The rotation of gear 1 is transmitted to gear 2, 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 and release the adhesion.

[0178] In one embodiment, the gear 2 is connected to the conversion rod 404 via a sliding bearing to avoid motion interference.

[0179] 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:

[0180] The limiting member 203 is connected between the first contact arm 201 and the second contact arm 202 and has insulation properties;

[0181] The limiting member 203 forms a limiting groove 204 , and the limiting groove 204 exposes at least the first contact arm 201 and the second contact arm 202 ;

[0182] The first contact end 401 is slidably restricted in the limiting groove 204;

[0183] Furthermore, the limiting groove 204 has insulation properties at least in the region between the first contact arm 201 and the second contact arm 202 .

[0184] In this embodiment, the sliding of the first contact end 401 is restricted 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.

[0185] The limiting member 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 current from short-circuiting through the limiting member 203 or interfering with the normal operation of the contact arms.

[0186] 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 and improving the working safety of the micro switch.

[0187] 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 current flow during normal operation.

[0188] 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 arc effects or instantaneous high currents from damaging the contact arms.

[0189] 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 from the contact range of the contact arm due to external force.

[0190] 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.

[0191] Normal Operation: During normal operation, current flows through the exposed areas of the first and second contact arms 201 and 202. The insulating properties of the retaining member 203 prevent the current from flowing in unintended paths. The retaining groove 204 ensures that the first contact end 401 remains stably in the contact arm position, reducing the risk of poor contact caused by current fluctuations.

[0192] When a sudden high current causes contact adhesion and the device enters self-repair mode, the retaining groove 204 prevents the first contact end 401 from shifting, ensuring that the reverse discharge current from capacitor 403 is concentrated on the adhesion area. The insulating properties of the retaining member 203 effectively prevent high temperatures or arcing from disrupting other areas during the self-repair process.

[0193] like Figure 4 As shown, the sixth embodiment of the present invention provides an anti-welding micro switch, and based on the above embodiment, the first contact arm 201 has a connecting terminal 2011;

[0194] The connection terminal 2011 maintains contact connection with the normally closed terminal 101 .

[0195] 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.

[0196] 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.

[0197] Through the stable connection of the connecting terminal 2011 , the normally closed terminal 101 can always maintain contact with the first contact arm 201 when the capacitor 403 switches, ensuring the continuity of the conductive path after the capacitor 403 switches in the self-repair mode.

[0198] 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.

[0199] 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.

[0200] Self-repairing state: If the contacts become stuck or melted, the microswitch enters a self-repairing state, switching capacitor 403 to a series connection. Connecting terminal 2011 maintains contact between first contact arm 201 and normally closed terminal 101, ensuring continuity of the reverse discharge path of capacitor 403. This allows capacitor 403 to release its charge in a concentrated manner, heating and releasing the stuck area.

[0201] In a specific embodiment, the connecting terminal 2011 is a conductive plate-shaped structure, which is always connected to the normally closed terminal 101 .

[0202] like Figure 7 and Figure 8 As shown, the seventh embodiment of the present invention provides an anti-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;

[0203] 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.

[0204] The fourth contact arm 302 is controlled by the contact force with the third contact arm 301 , and deforms and displaces away from the second current output terminal 105 of the normally open terminal 103 .

[0205] In this embodiment, the third contact arm 301 and the fourth contact arm 302 are designed with elastic structures, allowing them to deform and displace under the external force F1, thereby ensuring contact and conduction between them, thereby realizing a reverse discharge path for 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 terminal at this time, current is prevented from flowing out of this terminal, thereby concentrating the reverse current for self-repair.

[0206] Specifically, the third contact arm 301 and the fourth contact arm 302 are both elastic structures that allow controlled deformation under the action of external forces, thereby ensuring that they can reliably contact and conduct electricity in the self-healing state. This elastic structural design allows 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 capacitor 403. Under the action of external force F1, the third contact arm 301 deforms, 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 of this end, but is discharged through the reverse connection path of 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 normal output terminal, thereby concentrating the reverse current to solve the contact sticking problem.

[0207] 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 .

[0208] 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 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.

[0209] In one embodiment, the third contact arm 301 is a recessed groove that is recessed toward the fourth contact arm 302, and the inner wall of the recess contacts the state switch button 501. The fourth contact arm 302 is a protrusion that protrudes toward the third contact arm 301. This structural form is designed to enable contact between the two with minimal deformation. The external force F1 is transmitted to the third contact arm 301 via the state switch button 501.

[0210] like Figure 4 As shown, the eighth embodiment of the present invention provides an anti-welding micro switch, and based on the above embodiment, the third contact arm 301 forms a contact guide groove 701;

[0211] The fourth contact arm 302 forms a second contact guide groove 702;

[0212] Wherein, when the capacitor 403 is connected in series, the second contact end 402 contacts the contact guide groove 1 701;

[0213] When the capacitors 403 are connected in parallel, the second contact end 402 contacts the second contact guide groove 702 .

[0214] In this embodiment, by providing contact guide slot 1 701 and contact guide slot 2 702 on the third contact arm 301 and the fourth contact arm 302, the switching between the series and parallel states of the capacitor 403 is made more reliable and accurate. This structure ensures that the second contact end 402 can contact specific guide slots in different states, thereby controlling the connection mode of the capacitor 403 and realizing the self-healing function.

[0215] Contact guide groove 1 701 is provided on third contact arm 301 and is used to contact second contact terminal 402 when capacitors 403 are in series connection. Through contact guide groove 1 701, second contact terminal 402 can form a reliable reverse discharge path when capacitors 403 are in series connection, concentrating the current on the adhesion area.

[0216] A second contact guide 702 is provided on the fourth contact arm 302 and is configured to contact the second contact end 402 when the capacitors 403 are in parallel. When the capacitors 403 are in parallel, the second contact guide 702 ensures that the capacitors 403 can be charged through the parallel path, thereby absorbing instantaneous high current and protecting the contacts from current surges.

[0217] 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, ensuring the connection accuracy of the capacitor 403 in series and parallel states.

[0218] 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.

[0219] By providing the first contact guide groove 701 and the second contact guide groove 702 , the micro switch of this embodiment has higher accuracy and reliability in switching the capacitor 403 .

[0220] On the other hand, the position of the second contact terminal 402 is limited and constrained, further improving the connection stability and switching reliability of the capacitor 403 .

[0221] The structure of the contact guide groove 1 701 strictly limits the position of the second contact end 402 , ensuring that the second contact end 402 can only contact the guide groove 1 701 at a predetermined position, thereby achieving accurate series connection of the capacitor 403 .

[0222] This restriction prevents the second contact end 402 from deviating from the first contact groove 701 due to vibration or external force during reverse discharge, thereby ensuring that the current flows concentratedly through the adhesion area for self-repair.

[0223] Likewise, the second contact groove 702 imposes spatial constraints 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.

[0224] This structure prevents the second contact end 402 from accidentally deviating and causing poor contact under a large current impact, ensuring that the parallel path of the capacitor 403 is always stable, fully absorbing the large current impact, and protecting the contact.

[0225] like Figure 5 and Figure 6 As shown, the ninth embodiment of the present invention provides an anti-welding micro switch, and on the basis of the above embodiments, the switching mechanism 8 of the switch body 1 includes:

[0226] A first switching arm 801 having an end N1 and an end N2;

[0227] a second switching arm 802 having an end M1 and an end M2;

[0228] The end portion N1 and the end portion M2 are connected by an elastic member 803;

[0229] The end N2 is fixedly connected to the housing;

[0230] The end M1 is in sliding contact with the current input terminal 102;

[0231] Moreover, the end portion N1 is elastic;

[0232] Furthermore, the end portion M2 is connected to the common terminal 106 .

[0233] In this embodiment, the switching mechanism 8 of the anti-welding microswitch is mainly used to switch 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 by an elastic member 803, so that reliable switching can be achieved when the circuit is in normal use.

[0234] 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 .

[0235] During 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 connecting the normally open terminal 103 by pressing the terminal switching button 502 .

[0236] When the terminals are not stuck or melted, the terminal switching button 502 and the state switching button 501 are pressed simultaneously, i.e., external forces F1 and F2 are applied. If the sticking point melts, the terminal switching button 502 remains pressed, which helps to release the common terminal 106. This design ensures that even if the contacts stick, sufficient separation force is generated to release the terminals and restore normal switch function.

[0237] The technical features of the above embodiments can 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.

[0238] The above embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended 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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