Quick response type temperature fuse

Abstract

The invention discloses a quick response type temperature fuse which comprises a shell, a bimetallic strip arranged on the shell, a tripping device, a first electrode, a second electrode and an electrical breaking device arranged between the first electrode and the second electrode in a bridging mode. The two ends of the tripping device abut against the movable end of the bimetallic strip and the electrical breaking device respectively. The bimetallic strip is close to the shell; when the bimetallic strip is heated to deform, the tripping device and the electrical breaking device are pushed to be separated from the abutting state. The electrical breaking device is kept in a conducting state under the action of external force applied by the tripping device, and the electrical breaking device is in a disconnected state when the external force is removed. According to the invention, the advantages of two technologies of a bimetallic strip and a low-melting-point alloy are integrated, the defects of the two technologies are overcome, the user experience is improved, and the product performance is also greatly improved.

Description

Technical Field

[0001] The invention relates to the field of temperature fuses, in particular to a fast-response temperature fuse. Background Art

[0002] Currently in the field of thermal protection, the two main technical directions are the mechanical structure of bimetallic strips and the specific physical melting point of low-melting-point alloys. In practical applications, each has its own advantages and disadvantages.

[0003] The mechanical structure of the bimetallic strip has the following advantages: fast response speed; high precision and stable operating temperature; the operating temperature can be adjusted through size and material; the disadvantages are: A. Compared with temperature fuses made of low melting point alloys, it is large in size; B. Its current and voltage cutting capacity is low, and its normal breaking voltage is ≤250AC and its current is ≤20A; C. Because it is affected by temperature and opens and closes periodically, it is easy for the contacts to be welded by the current and cannot be disconnected.

[0004] Low-melting-point alloys have a specific physical melting point, and their advantages are: high breaking current and voltage capability, up to 1500VDC; high and stable operating temperature accuracy; the operating temperature can be adjusted by size and material; small size relative to the mechanical structure of the bimetallic strip; one-time action, no contact adhesion; their disadvantages are: A. Relatively slow response speed; B. Large gap between the operating temperature and the holding temperature, reaching more than 20°C; C. Low-melting-point alloys are easily affected by ambient temperature and deformed; D. Epoxy resin encapsulation is required.

[0005] In actual market applications, with the increase of heater power, the heating rate is much higher than the existing heater power, and the protection response rate requirements are increasingly accelerated. At the same time, the call for the integration of the two technical advantages is getting louder and louder. It is necessary to combine the advantages of both and overcome their disadvantages in order to better meet customer needs. Summary of the invention

[0006] The present invention aims to provide a fast-response temperature fuse to solve the problem of integrating the two technical advantages of the mechanical structure of the bimetallic strip and the specific physical melting point of the low-melting-point alloy in the field of thermal protection. The technical solution is as follows:

[0007] A fast response temperature fuse comprises a housing, a bimetallic strip arranged on the housing, a tripping device, a first electrode, a second electrode and an electrical disconnecting device arranged across the first electrode and the second electrode;

[0008] The two ends of the tripping device are respectively in contact with the movable end of the bimetallic strip and the electrical disconnecting device; the bimetallic strip is close to the housing; when the bimetallic strip is deformed by heat, the tripping device and the electrical disconnecting device are pushed out of the contact state;

[0009] The electrical disconnecting device maintains a conducting state under the external force applied by the tripping device, and is in a disconnecting state when the external force is removed.

[0010] In at least one embodiment, the electrical disconnecting device includes a contact and a reed, and the contact and the reed are respectively arranged on the first electrode and the second electrode. The reed abuts against the contact under the action of an external force, so that the electrical disconnecting device is in a conducting state; when the external force is removed, the reed moves away from the contact under the action of its elastic force, so that the electrical disconnecting device is in a disconnecting state.

[0011] In at least one embodiment, the tripping device includes a base, a limit block, a push rod and an elastic member; a groove is provided on the push rod; the limit block is a plate-like structure with a through hole; one end of the limit block abuts against the movable end of the bimetallic strip, which is the operating end of the tripping device, and one end of the push rod passes through the through hole so that the groove and the through hole are engaged; the elastic member is arranged between the limit block and the base, and is used to apply a force toward the direction of the bimetallic strip to the limit block, so that the limit block and the movable end of the bimetallic strip remain in abutment state, and the groove and the through hole remain in an engaged state; the end face of the other end of the push rod abuts against the electrical disconnecting device, so that the electrical disconnecting device remains in a conducting state; when the tripping device is in action, the movable end of the bimetallic strip pushes the limit block to move in a direction away from the bimetallic strip, so that the groove and the through hole are out of the engaged state, and the push rod moves in a direction away from the electrical disconnecting device under the reverse force of the electrical disconnecting device.

[0012] In at least one embodiment, the tripping device includes a swing arm, a base, a limit rod, a push rod and an elastic member; the swing arm is the operating end of the tripping device, the base is provided with a first through slot for limiting the limit rod to move forward and backward along a first direction, the base is provided with a second through slot or a second cavity is provided outside the base for limiting the push rod to move forward and backward along a second direction; the first direction is perpendicular to the second direction; the push rod is the tripping end of the tripping device; the movement directions of the swing arm and the limit rod are perpendicular, and the movement directions of the limit rod and the push rod are perpendicular; one end of the swing arm abuts against the movable end of the bimetallic strip, and the other end abuts against one end of the limit rod; the other end of the limit rod passes through the base and abuts against one end of the push rod; the end face of the other end of the push rod abuts against the electrical disconnecting device; the elastic member is used to apply a force toward the swing arm to the limit rod.

[0013] In at least one embodiment, a limiting cap having a diameter greater than that of the first through slot is provided at one end of the limiting rod, and the first through slot is a stepped through slot. One end of the elastic member abuts against the inner side of the limiting cap, and the other end abuts against the step of the stepped through slot.

[0014] In at least one embodiment, the swing arm is provided with an arc-shaped clearance groove.

[0015] In at least one embodiment, the tripping device includes a base, a swing arm, a limit block, a push rod and an elastic member; the swing arm is the operating end of the tripping device; the base is provided with a first through slot for limiting the forward and backward movement of the push rod along a first direction, and a second through slot for limiting the forward and backward movement of the limit block along a second direction, the first direction and the second direction being perpendicular; the push rod is the tripping end of the tripping device; the base is provided with a fulcrum for the swing arm to swing, and the middle part of the swing arm abuts against the fulcrum; one end of the limit block is provided with a limit step; one end of the swing arm abuts against the movable end of the bimetallic strip, and the other end abuts against the inner side of the limit step; the other end of the limit block abuts against one end of the push rod in the first through slot, and the other end of the push rod extends out of the base and abuts against the electrical disconnecting device; the elastic member is used to apply a force toward the limit block to the push rod.

[0016] In at least one embodiment, the first through groove is a stepped through groove, one end of the elastic member abuts against the inner side of the limiting cap, and the other end abuts against the junction of the stepped through groove.

[0017] In at least one embodiment, the shell includes a cover plate, an outer shell and a bottom plate, the bottom plate is a heat-conducting plate, and before deformation due to heat, the movable end of the bimetallic strip overlaps the bottom plate; after deformation due to heat, the movable end of the bimetallic strip is out of contact with the bottom plate.

[0018] In at least one embodiment, a high-voltage circuit breaker is further included, and the high-voltage circuit breaker includes a fuse, or a fuse and a low-melting-point alloy connected in series, and two ends of the high-voltage circuit breaker are respectively connected to the first electrode and the second electrode.

[0019] Technical effects:

[0020] The fast response temperature fuse of the present invention integrates the advantages of the current bimetallic strip and low melting point alloy technologies, while overcoming the disadvantages of the two technologies, thereby improving the user experience and significantly improving product performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a circuit principle block diagram of the fast response temperature fuse of the present invention;

[0022] Figure 2 is an exploded view of a first embodiment of a fast response thermal fuse;

[0023] Figure 3 is a schematic diagram of a first embodiment of a fast response thermal fuse in an untripped state;

[0024] Figure 4 is a schematic diagram of a tripping state of a first embodiment of a fast response thermal fuse;

[0025] Figure 5 is an exploded view of a second embodiment of a fast response thermal fuse;

[0026] Figure 6 is a schematic diagram of a second embodiment of a fast response thermal fuse in an untripped state;

[0027] Figure 7 is a schematic diagram of a tripping state of a second embodiment of a fast response type thermal fuse;

[0028] Figure 8 is an exploded view of a third embodiment of a fast response thermal fuse;

[0029] Fig. 9 is a schematic diagram of a third embodiment of a fast response thermal fuse in an untripped state;

[0030] Fig.10 1 is a schematic diagram of a tripping state of a third embodiment of a fast response temperature fuse. DETAILED DESCRIPTION

[0031] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0032] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0033] like Figure 1 As shown, the present invention provides a fast response temperature fuse, including a housing assembly 10 and a protection trigger device 20, a circuit current carrying device 30 and a circuit high voltage breaking device 30 arranged in the housing assembly 10.

[0034] The protection trigger device 20 includes a bimetallic strip 21 and a tripping device 22, and the two ends of the tripping device 22 are respectively in contact with the bimetallic strip 21 and the circuit current-carrying device 30. The bimetallic strip 21 directly contacts the heat source through the housing assembly 10. When the bimetallic strip 21 is deformed by heat and warps, it acts on the tripping device 22, causing the tripping device 22 to operate.

[0035] The circuit current-carrying device 30 includes two electrode sheets 31 and 32 and an electrical disconnecting device 33 connecting the two electrode sheets 31 and 32. The electrode sheets 31 and 32 may be nickel-plated brass or nickel-plated copper or other metals with good electrical conductivity. The electrical disconnecting device 33 is an active disconnecting mechanism, which will actively disconnect in the absence of external force. The tripping device 22 and the electrical disconnecting device 33 are in contact. Before the tripping device is actuated, under the abutment of the tripping device 22, the electrical disconnecting device 33 remains in the on state, the electrode sheets 31 and 32 are electrically connected, and the current is allowed to pass; when the tripping device is actuated, the electrical disconnecting device 33 will actively disconnect, so that the circuit of the electrode sheets 31 and 32 is disconnected through the electrical disconnecting device 33.

[0036] The circuit high-voltage disconnecting device 40 is an overcurrent disconnecting device, and its two ends are respectively connected to the two electrode plates of the circuit current-carrying device 30 by brazing or welding. After the electrical disconnecting device 33 of the electrode plates 31 and 32 is disconnected, all currents in the circuit will pass through the circuit high-voltage disconnecting device 40, and the circuit high-voltage disconnecting device 40 will be quickly disconnected due to overcurrent.

[0037] Example 1

[0038] like Figures 1 to 4 As shown, the present invention provides a specific embodiment of a fast response temperature fuse. The housing assembly 10 is composed of a cover plate 101, a shell 108 and a bottom plate 115; the circuit current carrying device 30 is composed of electrode plates 103, 104, a contact 106 and a spring 107; the trip device 22 is composed of a push rod 105, a base 110, springs 111, 112 and a limit block 113; the bimetallic strip 114 corresponds to the bimetallic strip 21 in the protection trigger device 20; and the circuit high voltage breaking device 40 is mainly composed of a fuse 109.

[0039] In this embodiment, the bottom plate 115 is circular and fixedly connected to the housing 108 via the hook 116. The bottom plate 115 is used to contact the heat source and transfer the heat to the bimetallic strip 114. When the temperature reaches a certain level, the bimetallic strip 114 will bend and deform, and the deformation will act on the tripping device to push the tripping device to trip.

[0040] The bimetallic strip 114 corresponds to the bimetallic strip 21 in the protection trigger device 20; the base 110, springs 111, 112, limit blocks 113, push rod 105, etc. constitute the tripping device in the protection trigger device 20; the electrode sheets 103, 104, contacts 106, and reeds 107 constitute the circuit current-carrying device 30, wherein the electrode sheets 103 and 104 correspond to the electrode sheets 31 and 32 in the circuit current-carrying device 30, respectively, and the contacts 106 and reeds 107 are arranged on the electrode sheets 103 and 104, and the two contact each other under the action of external force to form an electrical connection, constituting the electrical disconnection device 33 in the circuit current-carrying device 30. The fuse 109 is a core component in the circuit high-voltage disconnection device, and it melts when there is an overcurrent. The fuse 109 can be a metal wire with good electrical and thermal conductivity and a moderate melting point, such as a pure silver wire or a copper wire, and its two ends are electrically connected to the electrode sheets 31 and 32 by brazing, resistance welding, etc. Environmentally friendly filler 102, such as arc extinguishing medium, is usually filled around the fuse 109 to isolate the arc generated when the fuse is blown. In other embodiments, the core component in the circuit high-voltage disconnecting device 40 is a fuse connected in series with a low melting point alloy, and a flux is filled around it.

[0041] More specifically, the bottom plate 115 is a heat-conducting structure of the fast-response temperature fuse, which is usually made of metal materials such as copper alloy and stainless steel, and is placed close to the heat source when used. The cover plate 101 and the housing 108 are made of insulating, heat-resistant and explosion-proof ceramic materials to ensure the safety of the fast-response temperature fuse.

[0042] In this embodiment, the bimetallic strip 114 is disc-shaped, and its periphery is fixed to the bottom plate 115 or the housing 108, and its middle part is a movable end, which is arranged in contact with the bottom plate 115, so that the heat on the bottom plate 115 can be quickly transferred to the bimetallic strip 114. When the bimetallic strip 114 reaches the set temperature, its middle part will bend upward.

[0043] The base 110 is fixedly embedded in the housing 108. The housing 108 is provided with a plurality of through slots, and the push rod 105 is slidably disposed in the housing 108, and can move along its axial direction under the action of external force; the limit block 113 is slidably disposed in the housing 108. The springs 111 and 112 are disposed between the limit block 113 and the base 110, and are in a compressed state. The springs 111 and 112 apply force to the limit block 113, so that the limit block 113 and the movable end of the bimetallic strip 114 are in a conflicting state; at the same time, the limit block 113 and the push rod 105 are kept in a conflicting state, limiting the movement of the push rod 105 along its axial direction.

[0044] More specifically, the limiting block 113 includes a plate-like structure in the shape of a mountain character; the middle protrusion at the bottom of the plate-like structure in the shape of a mountain character abuts against the middle of the bimetal sheet 114. A long circular hole 1131 is provided on the middle protrusion of the plate-like structure in the shape of a mountain character, and an annular groove 1051 is provided on the side surface of the push rod 105. The push rod 105 is perpendicular to the limiting block 113 and passes through the long circular hole 1131, and the groove 1051 and the hole wall of the long circular hole 1131 form a snap-fit.

[0045] In this embodiment, when the bimetal sheet is warped by heat, it pushes up the limiting block 113, releasing the snap-fit between the groove 1051 and the hole wall of the long circular hole 1131. At this time, the push rod 105 is separated from other components of the tripping device and is in a tripped state, unable to apply a force to the electrical breaking device 33, and the electrical breaking device 33 actively breaks and pushes away the push rod 105.

[0046] In this embodiment, the electrical breaking device 33 includes a contact 106 and a reed 107. When the tripping device is in the non-tripped state, one end of the push rod 105 abuts against the middle of the reed 107, pressing down the reed 107 to abut against the contact 106, forming an electrical connection, and the main circuit of the electrode plates 103 and 104 is conducted. At this time, the reed 107 is in an elastic energy storage state. When the tripping device trips, the push rod 105 is in a tripped state, the elastic energy storage of the reed 107 is released, pushing the push rod 105, causing the push rod 105 to脱出 from the long circular hole 1131, and at the same time releasing the contact between the reed 107 and the contact 106, and the current-carrying circuit of the circuit is disconnected.

[0047] This embodiment uses a disc-shaped bimetal sheet. At the same time, the push rod is horizontally arranged, which is suitable for a packaging structure with a lower height.

[0048] Embodiment 2:

[0049] As Figure 1 、 Figures 5 to 7 shown, the present invention provides another embodiment of a fast-response type temperature fuse. Among them, the housing assembly 10 is composed of a housing 208, a cover plate 201, a bottom plate 214, etc.; the circuit current-carrying device 30 is composed of electrode plates 202, 203, contacts 204, reeds 205, etc.; the tripping device 22 is composed of a push rod 207, a base 211, a swing arm 212, a spring 209, a limiting rod 210, etc.; the bimetal sheet 213 corresponds to the bimetal sheet 21 in the protection trigger device 20; the circuit high-voltage breaking device 40 is mainly composed of a fuse 109.

[0050] In this embodiment, the bottom plate 214 is rectangular and is fixedly connected to the housing through rivets 215 and 216.

[0051] In this embodiment, the composition of the circuit current carrying device 30 and the circuit high voltage disconnecting device 40 is not significantly different from that in Embodiment 1, and the implementation method thereof has been described in Embodiment 2 and will not be elaborated here.

[0052] In this embodiment, the bimetallic strip 213 is in a strip shape, one end of which is fixed on the heat-conducting bottom plate 214 , and the other movable end contacts the first end of the swing arm 212 .

[0053] The base 211 is fixed in the shell 208. The shell 208 and the base 211 provide a first cross slot and a second cross slot for the push rod 207 and the limiting rod 210. The push rod 207 is arranged in the first cross slot, and the limiting rod 210 is arranged in the second cross slot.

[0054] The middle part of the swing arm 212 is connected to the housing 208 axis, one end of the swing arm 212 abuts against the movable end of the bimetallic strip 213, and the other end abuts against one end of the limit rod 210; the other end of the limit rod 210 protrudes into the first through slot and abuts against the push rod 207; the other end of the push rod 207 abuts against the spring 205, so that the spring 205 and the contact 204 abut against each other to form an electrical connection, thereby putting the circuit current-carrying device 30 in a connected state. A limit cap is provided at one end of the limit rod 210 abutting against the swing arm, and the second through slot is a stepped through slot. A spring 209 is sleeved on the limit rod 210, one end of the spring 209 abuts against the inner side of the limit cap, and the other end abuts against the step of the stepped through slot, and is in an energy storage state, thereby applying a force toward the swing arm 212 to the limit rod 210.

[0055] When the bimetallic strip 213 is warped by heat, the swing arm 212 rotates under the action of the bimetallic strip 213, and the end of the swing arm 212 that contacts the bimetallic strip 213 tilts upward, and the other end of the swing arm 212 moves downward, releasing the contact with the limit rod 210. Under the action of the spring 209, the limit rod 210 withdraws from the first through slot, releasing the conflicting state between the limit rod 210 and the push rod 207, thereby releasing the force of the push rod 207 on the spring 205, and the electrical disconnecting device is disconnected under the elastic force of the spring 205. Preferably, an arc-shaped clearance groove matching the shape of the limit cap is provided on the swing arm 212, so that the limit rod 210 can be released after the conflicting state between the limit rod 210 and the push rod 207 is released through a small moving distance, and then the limit rod 210 makes way. This embodiment adopts a strip-shaped bimetallic strip, and at the same time, the push rod is vertically arranged, which is suitable for a packaging structure with a narrow width.

[0056] Embodiment 3:

[0057] like Figure 1 , Figures 8 to 10As shown, the present invention provides another embodiment of a fast-response temperature fuse. The housing assembly 10 is composed of a housing 311, a cover plate 301, and a bottom plate 315; the circuit current-carrying device 30 is composed of electrode plates 302, 303, a contact 304, and a spring 307; the trip device 22 is composed of a push rod 305, a base 308, a limit block 309, a swing arm 310, and a spring 306; the bimetallic strip 314 corresponds to the bimetallic strip 21 in the protection trigger device 20; and the circuit high-voltage disconnecting device 40 is mainly composed of a fuse 312.

[0058] The base 308 is fixed in the housing 311 and provides a first through slot and a second through slot that cross each other for the push rod 305 and the limit block 309 . The push rod 305 is disposed in the first through slot, and the limit block 309 is disposed in the second through slot.

[0059] The swing arm 310 is arranged at the bottom of the base 308. The bottom of the base 308 is provided with a convex point as the swing fulcrum of the swing arm 310. A groove is provided in the middle of the swing arm 310 to form a match with the convex point. One end of the swing arm 310 abuts against the movable end of the bimetallic strip 314, and the other end abuts against the limit block 309. More specifically, a limiting step 3091 is provided on the limiting block 309; when the bimetallic strip 314 is warped by heat, the swing arm 310 rotates around the swing fulcrum by a certain angle or distance under the action of the bimetallic strip 314, and with the help of the cooperation between the swing arm 310 and the limiting step 3091 of the limiting block 309, the limiting block 309 is pushed to move in the direction away from the push rod 305 and withdraw from the first through groove, thereby releasing the supporting effect of the limiting block 309 on the push rod 305, so that the push rod 305 is released from the interference state with the reed 307 under the elastic force of the spring 306, and the electrical disconnecting device is disconnected under the elastic force of the reed 307, thereby cutting off the circuit.

[0060] A limiting cap is provided at one end where the push rod 305 and the limiting block 309 are abutted, and the first through groove is a stepped through groove. The spring 306 is sleeved on the push rod 305, and one end of the spring 306 abuts against the inner side of the limiting cap, and the other end abuts against the step of the stepped through groove, and is in an energy storage state, thereby applying a force to the push rod 305 in the direction of the limiting block 309.

[0061] This embodiment uses a disc-shaped bimetallic strip, and the push rod is arranged horizontally, which is suitable for a packaging structure with a relatively low height.

[0062] The fast response temperature fuse in the above embodiment integrates the advantages of the current bimetallic strip and low melting point alloy technologies, while overcoming the disadvantages of the two technologies, improving the user experience and significantly improving product performance. The integrated fast response temperature fuse has the following technical features:

[0063] Fast response time;

[0064] Adjustable temperature;

[0065] The operating temperature is high in accuracy and stable;

[0066] High breaking capacity, up to 1500VDC;

[0067] Small size;

[0068] Disposable product, no contact bonding occurs;

[0069] The operating temperature is consistent with the holding temperature;

[0070] Resistant to high and low temperature impact;

[0071] No epoxy resin encapsulation required;

[0072] High temperature resistance, can reach 500 ~ 1000 ℃;

[0073] Easy to install.

[0074] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A fast response thermal fuse, characterized in that: It comprises a housing, a bimetallic strip arranged on the housing, a tripping device, a first electrode, a second electrode and an electrical disconnecting device arranged across the first electrode and the second electrode; The two ends of the tripping device are respectively in contact with the movable end of the bimetallic strip and the electrical disconnecting device; The bimetallic strip is close to the housing; when the bimetallic strip is deformed by heat, it pushes the tripping device and the electrical disconnecting device out of the abutting state; The electrical disconnecting device maintains a conducting state under the external force applied by the tripping device, and is in a disconnecting state when the external force is removed.

2. The fast response thermal fuse according to claim 1, characterized in that: The electrical disconnecting device includes a contact and a reed, which are respectively arranged on the first electrode and the second electrode. The reed abuts against the contact under the action of an external force, so that the electrical disconnecting device is in a conducting state; when the external force is removed, the reed moves away from the contact under the action of its elastic force, so that the electrical disconnecting device is in a disconnecting state.

3. The fast response thermal fuse according to claim 1, characterized in that: The tripping device comprises a base, a limit block, a push rod and an elastic member; The push rod is provided with a groove; the limit block is a plate-like structure with a through hole; One end of the limit block abuts against the movable end of the bimetal strip, which is the operating end of the trip device, and one end of the push rod passes through the through hole, so that the groove and the through hole are engaged; the elastic member is arranged between the limit block and the base, and is used to apply a force toward the bimetal strip to the limit block, so that the limit block and the movable end of the bimetal strip remain in an abutting state, and the groove and the through hole remain in an engaged state; the end face of the other end of the push rod abuts against the electrical disconnecting device, so that the electrical disconnecting device remains in a conducting state; when the trip device is in action, the movable end of the bimetal strip pushes the limit block to move in a direction away from the bimetal strip, so that the groove and the through hole are out of the engaged state, and the push rod moves in a direction away from the electrical disconnecting device under the reverse force of the electrical disconnecting device.

4. The fast response thermal fuse according to claim 1, characterized in that: The tripping device comprises a swing arm, a base, a limit rod, a push rod and an elastic member; The swing arm is the operating end of the tripping device, the base is provided with a first through slot for limiting the movement of the limit rod forward and backward along a first direction, the base is provided with a second through slot or a second cavity is provided outside the base for limiting the movement of the push rod forward and backward along a second direction; the first direction and the second direction are perpendicular; the push rod is the tripping end of the tripping device; The movement directions of the swing arm and the limit rod are perpendicular, and the movement directions of the limit rod and the push rod are perpendicular; One end of the swing arm abuts against the movable end of the bimetallic strip, and the other end abuts against one end of the limit rod; the other end of the limit rod passes through the base and abuts against one end of the push rod; the end surface of the other end of the push rod abuts against the electrical disconnecting device; The elastic member is used to apply a force to the limiting rod toward the swing arm.

5. The fast response thermal fuse according to claim 4, characterized in that: One end of the limiting rod is provided with a limiting cap with a diameter larger than that of the first through slot, the first through slot is a stepped through slot, one end of the elastic member abuts against the inner side of the limiting cap, and the other end abuts against the step of the stepped through slot.

6. The fast response thermal fuse according to claim 4, characterized in that: The swing arm is provided with an arc-shaped giving way groove.

7. The fast response thermal fuse according to claim 1, characterized in that: The tripping device comprises a base, a swing arm, a limit block, a push rod and an elastic member; The swing arm is the operating end of the tripping device; the base is provided with a first through slot for limiting the forward and backward movement of the push rod along a first direction, and a second through slot for limiting the forward and backward movement of the limit block along a second direction, the first direction and the second direction are perpendicular; the push rod is the tripping end of the tripping device; The base is provided with a fulcrum for the swing arm to swing, and the middle part of the swing arm abuts against the fulcrum; one end of the limit block is provided with a limit step; one end of the swing arm abuts against the movable end of the bimetallic strip, and the other end abuts against the inner side of the limit step; the other end of the limit block abuts against one end of the push rod in the first through groove, and the other end of the push rod extends out of the base and abuts against the electrical disconnecting device; The elastic member is used to apply a force to the push rod toward the limit block.

8. The fast response thermal fuse according to claim 7, characterized in that: The first through groove is a stepped through groove, one end of the elastic member abuts against the inner side of the limiting cap, and the other end abuts against the junction of the stepped through groove.

9. The fast response thermal fuse according to claim 1, characterized in that: The shell includes a cover plate, an outer shell and a bottom plate, wherein the bottom plate is a heat-conducting plate. Before being deformed by heat, the movable end of the bimetallic strip overlaps the bottom plate; after being deformed by heat, the movable end of the bimetallic strip is out of contact with the bottom plate.

10. The fast response thermal fuse according to any one of claims 1 to 9, characterized in that: It also includes a circuit high-voltage disconnecting device, which includes a fuse, or a fuse and a low-melting-point alloy connected in series, and two ends of the circuit high-voltage disconnecting device are respectively connected to the first electrode and the second electrode.

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