A fast response type temperature fuse

Abstract

The utility model relates to protector technical field, especially in a kind of quick response temperature fuse, solve the problem such as poor contact caused by temperature sensing body aging or reed plastic deformation, including shell, trigger mechanism, temperature sensing body and conducting contact component. Shell is constituted by shell, cover and bottom plate, and inside formation accommodating space is formed;Trigger mechanism contains spring post and spring, spring post abuts temperature sensing body and is commonly placed in bottom plate placement hole;Conducting contact component includes push rod, multi-segment arc structure reed, contact and electrode sheet. When not triggering, spring is compressed, spring post supports push rod to make reed and contact contact conduction, temperature sensing body is deformed after heating, spring post is removed under the action of elastic force, push rod is out, reed is cut off circuit from contact. In addition, resistance wire is used for breaking current, shell and cover adopt concave-convex staggered cooperation, improve the withstand voltage ability between electrode and shell after breaking.

Description

Technical Field

[0001] This utility model relates to the field of protector technology, and in particular to a fast-response temperature fuse. Background Technology

[0002] As a key over-temperature protection component, thermal fuses are widely used in home appliances, lighting, energy storage, photovoltaics, automobiles and other fields. They are mainly used for heater protection, circuit over-temperature protection and overheat protection. Their reliability is directly related to the safety of the protected electronic equipment. When the equipment malfunctions and heats up to the melting temperature of the thermal fuse, the fuse must melt in time to cut off the circuit and avoid safety accidents.

[0003] Existing thermal fuses typically consist of a temperature-sensing element, electrodes, a ceramic housing, a push rod, and a spring. A typical structure involves a fusible temperature-sensing element at the bottom of the device, with a push rod above it to actuate a spring. During normal operation, the spring and electrode maintain contact, forming a circuit. When the temperature reaches the melting threshold, the fusible element melts, the push rod loses support, and the spring disengages from the electrode, breaking the circuit. However, this traditional structure has several technical drawbacks: firstly, with prolonged use, the spring ages, leading to poor contact between the spring and electrode, severely affecting the thermal fuse's operational stability; secondly, existing products have weak temperature resistance, making them unsuitable for high-temperature applications, and their breaking capacity and insulation performance are relatively low, failing to meet the requirements of high-voltage, high-current scenarios.

[0004] In practical applications, traditional thermal fuses are prone to generating electric arcs when breaking circuits, and the creepage distance of the arcs is relatively short, which can easily form a straight path leading to insulation failure. Their insulation withstand voltage and breaking capacity are far from meeting the standards of high-specification application scenarios, which also reduces the service life and operational reliability of thermal fuses.

[0005] Therefore, how to solve the problem of poor contact caused by the aging of the springs in existing thermal fuses, while improving the high temperature resistance and breaking capacity of the products to enhance their stability and service life, has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0006] To address the technical problem of simultaneously improving the high-temperature resistance and breaking capacity of thermal fuses, this invention provides a fast-response thermal fuse, comprising: a housing and a triggering mechanism, a temperature sensing element, and a conductive contact assembly disposed inside the housing; The temperature sensor is located in the displacement direction of the triggering mechanism and is disposed at the bottom end of the triggering mechanism; The conductive contact assembly includes a push rod, a spring, and a pair of opposing electrode plates; one end of the push rod abuts against the top of the triggering mechanism, and the other end abuts against the spring; the spring is pressed against the electrode plates by the push rod to achieve electrical connection. The reed has a multi-arc structure at one end of the main body, including a first arc and a second arc.

[0007] In some embodiments, the first arc and the second arc have curvature directions opposite to each other, and the curvature direction of the first arc is toward the push rod.

[0008] In some embodiments, the minimum equivalent radius of the first arc R1 ≥ 0.2 mm, and the minimum equivalent radius of the second arc R2 ≥ 0.2 mm.

[0009] In some embodiments, the outer casing includes a housing, a cover plate, and a base plate; the base plate is fixed to the lower opening of the housing by rivets, and the cover plate covers the upper opening of the housing; the housing and the cover plate adopt a staggered fit structure.

[0010] In some embodiments, the misaligned fit structure is a Z-type, S-type, V-type, or tooth-shaped structure.

[0011] In some embodiments, the triggering mechanism includes a spring post and a spring; the spring post is fitted with an energy-storing spring at its top and is vertically disposed at the bottom of the housing after abutting against the temperature sensing element at its bottom.

[0012] In some embodiments, the spring column includes a column body, a support portion, a spring shaft, and an abutment portion; the column body is vertically disposed at the lower center of the support portion, with its bottom end abutting against the temperature sensing element, and is disposed together with the temperature sensing element at the bottom of the outer casing; the abutment portion is vertically disposed at the upper center of the support portion, opposite to the column body across the support portion, and its side abutting against one end face of the push rod; the spring shaft is vertically disposed at the upper end of the support portion and is fitted with the spring.

[0013] In some embodiments, the conductive contact assembly further includes a contact point; the end of the spring away from the multi-segment arc structure is electrically connected to the electrode plate through the contact point; the electrode plate includes a first electrode plate and a second electrode plate, which are electrically connected to one end of the spring plate and the contact point respectively.

[0014] In some embodiments, one end of the push rod abuts against the triggering mechanism in the non-displacement direction of the triggering mechanism, and the other end abuts against the spring.

[0015] In some embodiments, the housing is provided with a baffle plate inside, the baffle plate being positioned corresponding to the push rod; it also includes a resistance wire, the resistance wire being electrically connected to the welding post on the electrode sheet.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The fast-response temperature fuse provided by this utility model adopts a support and transmission structure consisting of a temperature-sensing element, a spring post, a spring, and a push rod, replacing the design in the prior art where the temperature-sensing element directly supports the push rod. The spring post, under the energy storage effect of the spring compression, can still stably support the push rod even after the temperature-sensing element ages due to long-term use, solving the problem of poor contact between the spring and the contacts caused by the aging of the temperature-sensing element in the prior art. At the same time, the length of the temperature-sensing element in the spring extension direction is not less than the contact length between the push rod and the spring post, which can prevent the spring post from prematurely descending and causing false triggering.

[0017] In addition, the shell and cover plate adopt a Z-shaped, S-shaped or V-shaped staggered fit structure, and with the size design, the arc creepage distance is effectively increased, avoiding the formation of a straight arc path. After breaking test verification, the product's insulation withstand voltage can reach 2500VAC, and the insulation resistance meets the requirement of ≥0.2MΩ at 1700VDC, solving the problem of insufficient insulation performance of existing technology.

[0018] In terms of conductivity stability and anti-aging ability, the reed adopts a multi-segment arc structure design, including at least two arc structures with opposite curvature directions and radii of not less than 0.2 mm. This structure makes the cross-sectional change at the bend of the reed gentle and the stress distribution uniform, avoiding the stress concentration problem caused by a single sharp bend angle in the existing technology. With the selection of copper, stainless steel or copper-nickel-steel composite materials and timely aging treatment, the reed's current carrying capacity reaches 25A, and the temperature rise can be controlled within 30K, effectively delaying the aging plastic deformation caused by repeated pressure rebound during long-term use.

[0019] In particular, a resistance wire has been added and fixed to the electrode welding post by welding. This can improve the breaking capacity under high current scenarios, so that the product can still work stably under the breaking condition of 25A 935VDC, further improving the overall service life and reliability of the product. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 Exploded view of the fast-response temperature fuse structure provided in Embodiment 1 of this utility model; Figure 2This is a cross-sectional view of the conduction direction of the parallel circuit of the fast-response thermal fuse provided in Embodiment 1 of this utility model; Figure 3 This is an exploded view of the outer shell structure provided in Embodiment 1 of this utility model; Figure 4 This is a cross-sectional view of the vertical circuit conduction direction of the fast-response thermal fuse provided in Embodiment 1 of this utility model; Figure 5 An enlarged view of the fast-response thermal fuse I provided in Embodiment 1 of this utility model; Figure 6 A schematic diagram of the fast-response thermal fuse spring post structure provided in Embodiment 1 of this utility model; Figure 7 This is an assembly drawing of the triggering mechanism, base plate, and temperature sensor provided in Embodiment 1 of this utility model; Figure 8 An exploded view of the triggering mechanism structure provided in Embodiment 1 of this utility model; Figure 9 This is an assembly drawing of the conductive contact component, triggering mechanism, base plate, and temperature sensor provided in Embodiment 1 of this utility model; Figure 10 This is an assembly drawing of the triggering mechanism provided in Embodiment 1 of this utility model; Figure 11 This is an enlarged view of trigger mechanism II provided in Embodiment 1 of this utility model; Figure 12 This is a schematic diagram of the reed structure provided in Embodiment 1 of this utility model.

[0022] Figure label: 100 - Outer shell; 110 - Housing; 111 - Baffle; 120 - Cover plate; 130 - Base plate; 200 - Triggering mechanism; 210 - Spring column; 211 - Column; 212 - Supporting part; 213 - Spring shaft; 213a - First spring shaft; 213b - Second spring shaft; 214 - Abutting part; 220 - Spring; 300 - Temperature sensing element; 400 - Conductive contact assembly; 410 - Push rod; 420 - Spring sheet; 421 - Main body; 422 - First arc; 423 - Second arc; 430 - Contact point; 440 - Electrode sheet; 441 - First electrode sheet; 442 - Second electrode sheet. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "upper side," "lower side," "one end," "the other end," "center," "side," "internal," "external," and "surface," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] Example 1 This embodiment provides a fast-response temperature fuse, including a housing 100, a triggering mechanism 200, a temperature sensor 300, and a conductive contact assembly 400. The specific structure and connection relationship are as follows: See Figure 1 , 2 As shown in Figure 3, the outer casing 100 includes a housing 110, a cover plate 120, and a base plate 130, which together constitute the protective and support frame of the product. The base plate 130 is fixed to one end opening of the housing 110 by a first rivet 131 and a second rivet 132, forming a bottom seal; the cover plate 120 covers the other end opening of the housing 110, and the housing 110 and the cover plate 120 adopt a staggered fit structure.

[0026] Preferably, the misaligned fit structure can be designed as Z-shaped, S-shaped, V-shaped, toothed, or other forms with bent paths. Preferably, in this embodiment, a Z-shaped misaligned fit is used. Further details can be found in Table 1 and... Figure 4 , 5 As shown, by setting the matching dimensions, this concave-convex misalignment structure can significantly increase the creepage distance of the electric arc, avoid the formation of a straight path of the electric arc, and then divide the electric arc through multiple turning paths; as shown in Table 2, after breaking test verification, the product's insulation withstand voltage is as high as 2500VAC, which effectively solves the problem of insufficient insulation performance in the existing technology.

[0027] Table 1. Z-type misalignment fit dimension settings

[0028] Wherein, A is the height of the portion of the housing 110 protruding from the cover plate 120, B is the width of the portion of the housing 110 protruding from the cover plate 120, and C is the width of the portion of the cover plate 120 protruding from the housing 110.

[0029] Table 2. Results of the segmentation test

[0030] A placement hole is provided on the surface of the base plate 130. Preferably, the placement hole protrudes from the surface of the base plate 130 and its depth is greater than the thickness of the temperature sensor 300. One end of the temperature sensor 300 and the spring post 210 is disposed in the placement hole. The contact surface of the temperature sensor 300 and the spring post 210 is lower than the top surface of the placement hole. This ensures the stability of the fit between the temperature sensor 300 and the spring post 210, and the placement hole also guides the movement of the spring post 210. Furthermore, the spring post 210 and the placement hole are assembled using a clearance fit, which avoids affecting the flexibility of movement of the spring post 210 while also allowing impurities to be discharged and accelerating heat dissipation.

[0031] The base plate 130 is also symmetrically provided with countersunk holes protruding towards the housing 110. The diameter of the countersunk hole is larger than the diameter of the rivet head, and the depth of the countersunk hole is greater than or equal to the thickness of the rivet head. The countersunk holes are used to avoid the rivets during assembly.

[0032] Inside the housing 110, there is also a baffle 111. The baffle 111 is fixed to the housing 110 by riveting at the position corresponding to the push rod 410. Its function is to limit the range of movement of the push rod 410, prevent the push rod 410 from falling off or shifting during operation, and ensure that the push rod 410 can always accurately abut against the spring column 210 and the spring sheet 420 to maintain the stability of the transmission path.

[0033] See Figure 6 , 7 As shown, the triggering mechanism 200 includes a spring post 210 and a spring 220. The spring post 210 includes a post body 211, a supporting portion 212, a spring shaft 213, and an abutment portion 214. The post body 211 is vertically disposed at the lower center of the supporting portion 212, with its bottom end abutting against the temperature sensor 300, and together with the temperature sensor 300, it is placed in the placement hole of the base plate 130. The abutment portion 214 is vertically disposed at the upper center of the supporting portion 212, opposite to the post body 211 across the supporting portion 212, and its side abuts against one end face of the push rod 410. The spring shaft 213 includes a first spring shaft 213a and a second spring shaft 213b, which are vertically disposed at both ends of the upper side of the supporting portion 212, and each is fitted with a spring 220. When the product is not triggered, the spring 220 is in a compressed state.

[0034] In this embodiment, the contact size between the spring post 210 and the push rod 410 can compensate for the displacement of the spring post 210 caused by the slow contraction of the temperature sensor 300 during aging. During this process, the spring post 210 can still stably press against the limiting push rod 410, thereby ensuring that the spring 420 and the contact 430 are in contact. This solves the problem of poor contact between the spring 420 and the contact 430 due to the aging of the temperature sensor in the prior art, and improves the working stability of the product.

[0035] Preferably, the triggering mechanism 200 is displaced in the vertical direction, and the push rod is set in the horizontal direction perpendicular to the vertical direction. At this time, the movement direction of the push rod 410 is 90° with the movement direction of the triggering mechanism 200. The length of the temperature sensing element 300 in the extension direction of the spring 220 (i.e., the vertical direction) is greater than or equal to the length of the push rod 410 abutting against the spring column 210 in this direction (i.e., the horizontal direction). This size design can ensure that the temperature sensing element 300 can fully support the spring column 210 in the untriggered state, avoiding premature downward movement of the spring column 210 and causing false triggering, ensuring the conductivity reliability of the product within the normal temperature range. At the same time, it can also ensure that the displacement generated after the temperature sensing element 300 melts can ensure that the push rod 410 completely loses the support of the spring column 210, so that the spring 420 loses its squeezing effect, completely separates from the electrode plate 440, and cuts off the circuit.

[0036] In other embodiments, the angle formed between the movement direction of the push rod 410 and the movement direction of the trigger mechanism 200 can be any degree in the range of [45°-135°], and can be adjusted according to actual needs. That is, it is ensured that after the push rod 410 abuts against the trigger mechanism 200, the projection in the displacement direction of the trigger mechanism 200 is not zero, and preferably the projection length is less than or equal to the thickness of the temperature sensing element 300.

[0037] See Figure 8 , 9 As shown, the conductive contact assembly 400 includes a push rod 410, a spring 420, a contact 430, and an electrode plate 440, responsible for realizing the circuit's conduction and disconnection. The electrode plate 440 includes a first electrode plate 441 and a second electrode plate 442, which are arranged at a relative interval within the accommodating space of the housing 100. One end of each electrode plate 441 and second electrode plate 442 passes through the housing 100 and protrudes outside the housing 100, facilitating connection to external circuits. Preferably, both the first electrode plate 441 and the second electrode plate 442 are fixed to the housing 110 by riveting. The riveting process enhances the connection strength between the electrode plate 440 and the housing 110, preventing loosening of the contact due to vibration under high current conditions.

[0038] One end of the reed 420 is spot-welded to the first / second electrode 441 / 442, and the other end is pressed by the push rod 410 and overlaps with the contact 430. The contact 430 is spot-welded to the second / first electrode 442 / 441. For a more preferred embodiment, see [reference needed]. Figure 10 , 11 As shown, the connection between the spring 420 and the first / second electrode 441 / 442 is reinforced by the spring rivet 424. Specifically, the welding head flattens the rivet during welding to achieve the riveting function. At the same time, welding also carries current, so it also has the function of welding.

[0039] One end of the push rod 410 abuts against the side wall of the abutment part 214, and the other end abuts against the spring 420. In the untriggered state, the push rod 410 continuously presses against the spring 420 under the support of the spring column 210, so that the spring 420 and the contact 430 are in close contact, forming a conductive circuit.

[0040] For better performance, to improve current carrying capacity and anti-aging properties, please refer to [reference needed]. Figure 12 As shown, the reed 420 adopts a multi-segment arc structure design, specifically including a first arc 422 and a second arc 423 with opposite curvature directions. One end of the first arc is connected to the end of the main body 421 of the reed 420, and the other end is connected to the second arc 423, with the curvature direction facing the push rod 410. The second arc 423 is connected to a tangent support plate, and the end of the reed 420 with the multi-segment arc structure is electrically connected to the first electrode plate 441 through the support plate. More preferably, the minimum equivalent radius R1 of the first arc is ≥ 0.2 mm, and the minimum equivalent radius R2 of the second arc is ≥ 0.2 mm.

[0041] In other embodiments, the arcs of the multi-segment arc structure of the reed 420 are not directly connected. A straight line is provided between the first arc 422 and the second arc 423, connecting the first arc 422 and the second arc 423. Of course, multiple arcs can also be provided in the multi-segment arc structure. Further details are omitted here.

[0042] More preferably, contact surfaces are provided in the direction perpendicular to the current flow direction (horizontal direction) of the first electrode plate 441 and the second electrode plate 442, respectively, and the support plate and contact point 430 of the spring plate 420 make electrical contact with the first / second electrode plate 441 and the second / first electrode plate 442, respectively, to ensure stable electrical contact.

[0043] The multi-segment circular arc structure consists of at least two arcs 422 and 423 with opposite curvature directions. Preferably, the first arc 422 and the second arc 423 are both circular arcs. In other embodiments, the first arc 422 and the second arc 423 can be any combination of circular arcs and non-circular arcs.

[0044] In existing technology, when a reed bends, its inner layer is compressed and its outer layer is stretched. At its single, sharp bending angle, the stress distribution is uneven and increases sharply, with the stress peak being much greater than the average stress in other areas of the part. Furthermore, in repeated compression and rebound cycles, microcracks are easily generated at stress concentration points, which gradually propagate and eventually lead to fracture. In addition, even a single excessive pressure may cause the stress at that point to exceed the material's yield strength, resulting in permanent deformation of the material that cannot return to its original shape.

[0045] In this embodiment, the multi-segment circular arc structure design of the spring 420 makes the cross-sectional change more gradual, thereby making the stress change at the bending point of the spring 420 more gradual and avoiding sudden surges in stress. Furthermore, geometrically, the combined effect of the two tangent arcs is macroscopically equivalent to a larger and smoother transition curvature. A larger radius of curvature results in a smaller stress concentration factor, which directly reduces the maximum stress value at the bending point. Finally, compared to a single bend that concentrates deformation and stress in a very narrow band, the double bend distributes the total bending deformation to two adjacent areas, dispersing the deformation area and delaying the aging plastic deformation caused by repeated compression and rebound during operation.

[0046] Example 2 This embodiment provides a fast-response temperature fuse, which is basically the same in structure as Embodiment 1. The core difference is the addition of a resistance wire to further improve the breaking reliability in high-current scenarios, as detailed below: The resistance wire is fixed to the welding post of the electrode plate 440 by welding and is connected in parallel with the main circuit. When the product is used in a circuit with a large rated current, the resistance wire interrupts the current at the moment when the spring plate 420 and the contact 430 lose contact. To a certain extent, it can quickly play an arc-extinguishing role and prevent arcing caused by excessive circuit current, which would damage the surface of the spring plate 420 and the contact 430 and cause incomplete interruption. The addition of the resistance wire can effectively avoid this problem, so that the product can still work stably under the interruption condition of 25A 935VDC, further expanding the application scenarios of the product.

[0047] In this embodiment, the structure, connection relationship and beneficial effects of other components such as the housing 100, triggering mechanism 200, temperature sensor 300 and conductive contact assembly 400 are consistent with those of Embodiment 1, and will not be repeated here.

[0048] In this invention, the material of the shell 110 includes, but is not limited to, insulating materials such as ceramics and plastics; preferably, engineering plastics or thermosetting materials are selected, which have both good high temperature resistance and insulation, so as to adapt to high temperature environment and avoid the risk of short circuit due to the conductivity of components.

[0049] The spring 420 is made of copper, stainless steel, or copper-nickel-steel composite material. Combined with a multi-segment arc structure design, it enables the product to carry a current of 25A, meeting the protection requirements of high-current circuits. As shown in Table 3, temperature rise testing has verified that the temperature rise can be controlled below 30K, preventing excessive temperature rise from affecting surrounding components. Simultaneously, the spring 420 undergoes aging treatment, which, while maintaining its elasticity, also helps reduce the degree of plastic deformation caused by the push rod after aging.

[0050] Table 3 Temperature Rise Test

[0051] The working method of the fast-response temperature fuse provided by this utility model is as follows: It is installed in heaters or circuits requiring over-temperature protection in fields such as home appliances, lighting, energy storage, photovoltaics, or automobiles, so that the first electrode 441 and the second electrode 442 of the electrode plate 440 form an electrical connection with the circuit, completing the assembly. Under normal operating conditions, the spring 220 is in a compressed state, and the spring post 210 maintains a stable position under the support of the temperature sensing element 300, thereby pushing the push rod 410 to press against the spring plate 420, making the spring plate 420 make tight contact with the contact 430, and maintaining the circuit conductivity. When the protected equipment experiences an abnormal fault, such as a short circuit or overload, causing the temperature to rise to the product's melting temperature, the temperature sensing element 300 softens due to heat and loses its supporting function for the spring column 210. Under the elastic force of the spring 220, the spring column 210 moves downward, the push rod 410 disengages from the side wall of the spring column 210, and the spring 420 disengages from the contact 430 under its own elastic force, thus achieving circuit disconnection. During the disconnection process, the misaligned fit structure of the housing 110 and the cover plate 120 divides the arc, and the resistance wire assists in extinguishing the arc, ensuring the safety performance after the circuit is disconnected.

[0052] Although this article frequently uses terms such as outer shell, housing, cover plate, base plate, triggering mechanism, spring column, column, bearing part, spring shaft, first spring shaft, second spring shaft, abutment part, spring, temperature sensing element, conductive contact assembly, push rod, spring sheet, main body, first arc, second arc, contact point, electrode sheet, first electrode sheet, second electrode sheet, resistance wire, baffle, copper cap, alloy, welded column, concave-convex misalignment structure, multi-segment arc structure, clearance fit, placement hole, accommodating space, creepage distance, length, radius, and mating size The terminology used includes terms such as inch, temperature rise, insulation withstand voltage, insulation resistance, current carrying capacity, breaking condition, melting temperature, ceramics, plastics, engineering plastics, thermosetting materials, copper, stainless steel, copper-nickel-steel composite materials, rivet, thermal fuse, rivet fixing, cover, sleeve, abutment, spot welding fixing, welding fixing, riveting fixing, aging treatment, breaking test, temperature rise test, sealing fixing, drainage function, tension, compression, plastic deformation, crack propagation, conductive circuit, circuit interruption, arc extinguishing, etc., but the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. For example, the bottom plate placement hole can be circular, square or other shapes, and the spring column can be circular, square or other shapes. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A fast-response thermal fuse, characterized in that, include: The housing (100) and the triggering mechanism (200), the temperature sensor (300) and the conductive contact assembly (400) disposed inside the housing (100). The temperature sensor (300) is located in the displacement direction of the triggering mechanism (200); The conductive contact assembly (400) includes a push rod (410), a spring (420), and a pair of opposing electrode plates (440); one end of the push rod (410) abuts against the top of the triggering mechanism (200), and the other end abuts against the spring (420); after the spring (420) abuts against the push rod (410), it is pressed into electrical connection with the electrode plate (440); The reed (420) has a multi-arc structure at one end of the main body (421), including a first arc (422) and a second arc (423).

2. The fast-response thermal fuse according to claim 1, characterized in that: The curvature directions of the first arc (422) and the second arc (423) are opposite, and the curvature direction of the first arc (422) is toward the side of the direction of movement of the push rod (410).

3. The fast-response thermal fuse according to claim 2, characterized in that: The minimum equivalent radius R1 of the first arc (422) is ≥0.2 mm, and the minimum equivalent radius R2 of the second arc (423) is ≥0.2 mm.

4. The fast-response thermal fuse according to claim 1, characterized in that: The outer shell (100) includes a shell (110), a cover plate (120), and a bottom plate (130); the bottom plate (130) is fixed to the lower opening of the shell (110) by rivets, and the cover plate (120) covers the upper opening of the shell (110); the shell (110) and the cover plate (120) adopt a staggered fit structure.

5. The fast-response thermal fuse according to claim 4, characterized in that: The concave-convex misaligned fit structure is a Z-type, S-type, V-type, or tooth-shaped structure.

6. The fast-response thermal fuse according to claim 1, characterized in that: The triggering mechanism (200) includes a spring post (210) and a spring (220); the spring post (210) is fitted with the energy-storing spring (220) at the top and is vertically disposed at the bottom of the outer shell (100) after abutting against the temperature sensor (300).

7. The fast-response thermal fuse according to claim 6, characterized in that: The spring column (210) includes a column body (211), a bearing part (212), a spring shaft (213), and an abutment part (214). The column (211) is vertically disposed at the lower center of the bearing part (212), with its bottom end abutting against the temperature sensor (300), and together with the temperature sensor (300), it is disposed at the bottom of the outer shell (100); the abutting part (214) is vertically disposed at the upper center of the bearing part (212), opposite to the column (211) across the bearing part (212), and its side abutting against one end face of the push rod (410); the spring shaft (213) is vertically disposed at the upper end of the bearing part (212), and the spring (220) is sleeved on it.

8. The fast-response thermal fuse according to claim 1, characterized in that: The conductive contact assembly (400) further includes a contact (430); the end of the spring (420) away from the multi-segment arc structure is electrically connected to the electrode plate (440) through the contact (430); the electrode plate (440) includes a first electrode plate (441) and a second electrode plate (442), which are electrically connected to one end of the spring (420) and the contact (430) respectively.

9. The fast-response thermal fuse according to claim 1, characterized in that: One end of the push rod (410) abuts against the trigger mechanism (200) in the non-displacement direction of the trigger mechanism (200), and the other end abuts against the spring (420).

10. The fast-response thermal fuse according to claim 4, characterized in that: The housing (110) is provided with a baffle (111) inside, the baffle (111) being positioned corresponding to the push rod (410); it also includes a resistance wire, the resistance wire being electrically connected to the welding post on the electrode sheet (440).

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