Electric equipment and high-voltage arc extinguishing temperature fuse thereof

Abstract

The utility model provides an electric device and a high-voltage arc extinguishing temperature fuse thereof, and relates to the technical field of temperature fuses, the electric device comprises a housing assembly and an electrode assembly arranged in the housing assembly, the electrode assembly comprises a plurality of temperature sensing alloys, a first electrode and a second electrode, the temperature sensing alloys are welded between the first electrode and the second electrode in parallel at equal intervals, the temperature sensing alloys are connected in parallel, the current carrying directions of the temperature sensing alloys are consistent, and the temperature sensing alloys are configured to shunt based on parallel connection and resist surge current; the temperature sensing alloy is concentrically matched with an arc extinguishing rib of the shell assembly, the electrodes are matched with an anti-stacking alloy rib of the shell assembly in a lap joint mode, and the first electrode and the second electrode are used for being connected with electric equipment. The utility model has the advantages of higher fusing heat energy, high-efficiency, reliable and safe disconnection capability under large voltage and large current, and consistent disconnection efficiency can be kept when different planes of the product are close to a heat source.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature fuses, in particular to an electrical device and a high-voltage arc-extinguishing temperature fuse thereof. Background Art

[0002] A thermal fuse is a component that cuts off the power circuit by fusing itself when an electrical appliance fails and causes abnormal temperature, thereby protecting the safety of the entire circuit. A thermal fuse has the characteristics of accurate fusing temperature, high voltage resistance, small size and low cost.

[0003] When the power is cut off or connected, the sudden change of voltage will instantly generate a high-amplitude, high-frequency, and short-duration surge current. This current can easily cause the temperature-sensitive alloy to melt prematurely, burn the circuit electrical appliances, cause equipment damage or reduce its life. The existing technology is based on the principle of parallel shunt. By designing multiple temperature-sensitive alloys, the product's ability to withstand large impact currents is improved, but multiple alloys often melt and accumulate, resulting in the problem that the product cannot be disconnected; in a higher voltage DC circuit, when the gap between the two ends of the alloy disconnection is small, an arc will be generated. When the continuous arcing causes the internal energy to rise sharply, the product will burn or even explode, affecting the safety of other devices in the entire circuit and endangering life and property safety; the new energy fast charging market is becoming more and more popular, and the best way to achieve fast charging is to increase the input voltage. Under high voltage and high current conditions, ordinary fuses have no effective measures to solve the problem of continuous arcing caused by the disconnection process, and when multiple alloys melt, the alloy will flow along the electrodes and cause accumulation, resulting in the product being unable to be effectively disconnected at the set temperature. Ordinary fuses also have no low-cost and efficient solution. In addition, one plane of the finished product of an ordinary fuse is sealed with resin. Due to the low thermal conductivity of the resin, when the heat source is close to the resin plane, the temperature fuse is prone to disconnect slowly, exacerbating safety hazards.

[0004] Specifically, ordinary fuses currently on the market are designed with a parallel connection of multiple temperature-sensitive alloys. The current withstand value of a single temperature-sensitive alloy is reduced by parallel shunting when the surge current comes, so that the product can smoothly withstand the surge current; however, under the two conditions that the alloys are attracted to each other by the magnetic field force and the product is upright, and the alloys are close to each other due to gravity, there is a high probability that the alloys will accumulate with each other, resulting in the product being unable to effectively disconnect the circuit when it reaches the set temperature point. In addition, ordinary fuses are equipped with barrier blocks between multiple alloys to solve the problem of alloy accumulation, but there is no obstruction between the solder joints on both sides of the electrodes, and the alloys will flow along the electrodes, resulting in accumulation, which also causes the safety problem that the product cannot effectively disconnect the circuit when it reaches the set temperature point. At the same time, ordinary fuses are equipped with barrier blocks between multiple alloys to solve the problem of alloy accumulation, but common shell structures on the market such as Fig. 9 , Fig.10As shown, the blocking block C2 is small in size, and it is easy to fall off and loosen when it is installed between two ordinary temperature-sensitive alloys C11; and when the ordinary electrode assembly C1 is installed in the ordinary shell C3, the loose blocking block C2 causes assembly interference and jamming, affecting the assembly efficiency; the shell mouth is sealed with ordinary epoxy resin C4, and the large amount affects the cost, and the large amount of resin is prone to uneven mixing, and bubbles appear on the resin surface after baking, affecting the yield of the finished product; one plane of the ordinary fuse product is sealed with resin. Due to the low thermal conductivity of the resin, when the heat source is close to this resin plane, the temperature fuse is prone to disconnect slowly, exacerbating the safety hazard. Finally, ordinary fuses use special fat tension to pull the alloy apart. Under low voltage and low current conditions, the arc energy is low, and the special fat tension is sufficient to break the arc; but under high voltage and high current conditions in the new energy field, the instantaneous energy of the arc is high, and the pulling force provided by the special fat tension alone is far from enough to break the arc, resulting in product burning and explosion.

[0005] In view of this, this application is filed. Utility Model Content

[0006] The utility model provides an electrical device and a high-voltage arc-extinguishing temperature fuse thereof, which can at least partially improve the above-mentioned problem.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A high voltage arc extinguishing temperature fuse, comprising: a shell assembly, and an electrode assembly arranged in the shell assembly;

[0009] The electrode assembly includes a plurality of temperature-sensitive alloys, a first electrode and a second electrode, each of the temperature-sensitive alloys is welded between the first electrode and the second electrode in parallel and at equal intervals, each of the temperature-sensitive alloys is connected in parallel, and each of the temperature-sensitive alloys has a consistent current-carrying direction, and the temperature-sensitive alloys are configured to resist surge current based on parallel shunting;

[0010] The temperature-sensitive alloy is concentrically matched with the arc-extinguishing rib of the shell component, the first electrode and the second electrode are overlapped with the anti-piling alloy rib of the shell component, and the first electrode and the second electrode are used to be connected to electrical equipment.

[0011] Preferably, the shell assembly comprises a cover plate and an outer shell, the cover plate and the outer shell are overlapped and matched, and the electrode assembly is placed inside the outer shell.

[0012] Preferably, the cover plate and the housing are made of ceramic material.

[0013] Preferably, the cover plate is provided with a cover plate glue dispensing groove, a cover plate arc extinguishing rib and a cover plate anti-piling alloy rib, wherein the temperature-sensitive alloy is concentrically matched with the cover plate arc extinguishing rib with a gap of 0.2mm to 0.5mm, and the first electrode, the second electrode and the cover plate anti-piling alloy rib are overlapped.

[0014] Preferably, the shell is provided with shell anti-stacking alloy ribs and shell arc-extinguishing ribs, the temperature-sensitive alloy is concentrically matched with the shell arc-extinguishing ribs, and the gap is 0.2mm~0.5mm, the first electrode, the second electrode and the shell anti-stacking alloy ribs are overlapped and matched, and the cover plate anti-stacking alloy ribs and the shell anti-stacking alloy ribs separate each of the temperature-sensitive alloys into multiple separate chambers.

[0015] Preferably, it also includes special grease, which completely wraps each of the temperature-sensitive alloys.

[0016] Preferably, epoxy resin is further included, and the epoxy resin is filled in the glue dispensing groove of the cover plate and the mouth of the shell, and is baked and cured to achieve sealing between the cover plate and the shell.

[0017] The utility model also discloses an electrical device, which comprises a device body and a high-voltage arc-extinguishing temperature fuse as described in any one of the above items, wherein the high-voltage arc-extinguishing temperature fuse is arranged on the device body.

[0018] In summary, the temperature-sensitive alloys of the high-voltage arc-extinguishing temperature fuse are welded on electrodes in parallel and at equal intervals; multiple temperature-sensitive alloys are connected in parallel, and based on the parallel shunt concept, they can effectively resist surge current and effectively reduce or even avoid the risk of premature disconnection of the temperature-sensitive alloys; and the current-carrying directions of multiple alloys are consistent. Based on the principle of "like attracts like" of magnetic field force, the alloys are easily accumulated on each other, and the effect of gravity is more obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an explosion diagram of a high voltage arc extinguishing temperature fuse provided by an embodiment of the utility model;

[0020] Figure 2 It is an axonometric view of a cover plate provided by an embodiment of the utility model;

[0021] Figure 3 It is a three-view drawing of the cover plate provided by the embodiment of the utility model;

[0022] Figure 4 It is an isometric view of an electrode assembly provided in an embodiment of the utility model;

[0023] Figure 5 It is an axonometric view of the housing provided by the embodiment of the utility model;

[0024] Figure 6It is a three-view drawing of the housing provided by the embodiment of the utility model;

[0025] Figure 7 It is a cross-sectional view of an arc-extinguishing fuse provided by an embodiment of the utility model;

[0026] Figure 8 It is a cross-sectional view of an arc-extinguishing fuse provided by an embodiment of the utility model;

[0027] Fig. 9 This is a diagram of a normal fuse explosion;

[0028] Fig.10 This is a cross-sectional diagram of a common fuse. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0030] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0031] See also Figure 1 and Figure 4 The utility model discloses a high voltage arc extinguishing temperature fuse, which comprises: a shell component, and an electrode component 2 arranged in the shell component;

[0032] The electrode assembly includes a plurality of temperature-sensitive alloys 21, a first electrode 22 and a second electrode 23, each of the temperature-sensitive alloys 21 is welded between the first electrode 22 and the second electrode 23 in parallel and at equal intervals, each of the temperature-sensitive alloys 21 is connected in parallel, and the current-carrying direction of each of the temperature-sensitive alloys 21 is consistent. The temperature-sensitive alloys 21 are configured to resist surge current based on parallel shunting;

[0033] The temperature-sensitive alloy 21 is concentrically matched with the arc-extinguishing rib of the shell assembly, and the first electrode 22 and the second electrode 23 are overlapped with the anti-piling alloy rib of the shell assembly. The first electrode 22 and the second electrode 23 are used to connect with electrical equipment.

[0034] In this embodiment, the first electrode 22, the second electrode 23 and the temperature-sensitive alloy 21 are welded together to form an electrode assembly 2. The plurality of temperature-sensitive alloys 21 are welded on the first electrode 22 and the second electrode 23 in parallel and at equal intervals; the plurality of temperature-sensitive alloys 21 are connected in parallel, and based on the parallel shunting concept, surge current can be effectively resisted, and the risk of premature disconnection of the temperature-sensitive alloy 21 can be effectively reduced or even avoided.

[0035] Preferably, the shell assembly includes a cover plate 1 and an outer shell 3 , the cover plate 1 and the outer shell 3 are overlapped and matched, and the electrode assembly 2 is placed inside the outer shell 3 .

[0036] Preferably, the cover plate 1 and the housing 3 are made of ceramic material.

[0037] Preferably, the cover plate 1 is provided with a cover plate glue dispensing groove 11, a cover plate arc extinguishing rib 12 and a cover plate anti-piling alloy rib 13, wherein the temperature-sensitive alloy 21 is concentrically matched with the cover plate arc extinguishing rib 12 with a gap of 0.2mm to 0.5mm, and the first electrode 22, the second electrode 23 is overlapped with the cover plate anti-piling alloy rib 13.

[0038] Preferably, the shell 3 is provided with shell anti-stacking alloy ribs 31 and shell arc-extinguishing ribs 32, the temperature-sensitive alloy 21 is concentrically matched with the shell arc-extinguishing ribs 32, and the gap is 0.2mm~0.5mm, the first electrode 22, the second electrode 23 is overlapped with the shell anti-stacking alloy ribs 31, and the cover plate anti-stacking alloy ribs 13 and the shell anti-stacking alloy ribs 31 separate each of the temperature-sensitive alloys 21 into multiple separate chambers.

[0039] See also Figures 2 to 3 , Figures 5 to 8In this embodiment, the electrode assembly 2 is placed in the shell 3, the temperature-sensitive alloy 21 is concentrically matched with the shell arc-extinguishing rib 32, with a gap of 0.2 to 0.5 mm, and the first electrode 22 and the second electrode 23 are overlapped with the shell anti-stacking alloy rib 31; the cover plate 1 is overlapped with the shell 3, the temperature-sensitive alloy 21 is concentrically matched with the cover plate arc-extinguishing rib 12, with a gap of 0.2 to 0.5 mm, and the first electrode 22 and the second electrode 23 are overlapped with the cover plate anti-stacking alloy rib 13; the current-carrying directions of multiple alloys are consistent, and based on the principle of "same-direction attraction" of magnetic field force, the alloys are easy to accumulate with each other, and gravity is more obvious, and the cover plate anti-stacking The gold ribs 13 and the anti-stacking alloy ribs 31 of the shell divide the alloy into multiple separate chambers, effectively avoiding the problem of mutual accumulation between the two, which leads to the inability to effectively disconnect the product; the temperature-sensitive alloy 21 is concentrically matched with the cover plate arc-extinguishing ribs 12 and the shell arc-extinguishing ribs 32, and the gap is 0.2-0.5mm. Under the scenario of high voltage and current, the alloy will ignite an arc at the moment of disconnection. Under the action of its own Lorentz force, the arc will deviate outward from the alloy axis. When the arc contacts the arc-extinguishing ribs 12 and the arc-extinguishing ribs 32, the arc is extinguished by the cutting effect. The shell 3 and the cover plate 1 are made of ceramic materials with strong thermal conductivity. They can quickly conduct the heat of the arc and reduce the energy accumulation inside the product to cause shell explosion.

[0040] Preferably, it further comprises special grease 4 , and the special grease 4 completely wraps each of the temperature-sensitive alloys 21 .

[0041] Preferably, epoxy resin 5 is further included, and the epoxy resin 5 is filled in the cover plate glue dispensing groove 11 and the mouth of the shell 3, and is baked and cured to achieve sealing between the cover plate 1 and the shell 3.

[0042] See also Figures 7 and 8 In this embodiment, the cover plate 1, the electrode assembly 2 and the housing 3 are solidified and connected by special grease 4 and epoxy resin 5; the special grease 4 completely wraps the temperature-sensitive alloy 21. When the alloy reaches the specified melting point and softens, it will be broken by the tension of the special grease 4 and shrink toward the two electrode sides, thereby completely disconnecting the alloy and cutting off the circuit.

[0043] The epoxy resin 5 is filled in the cover plate dispensing groove 11 and the mouth of the shell 3, and after baking and curing, the sealing effect of the cover plate 1 and the shell 3 is achieved. By assembling the cover plate, the amount of resin used is reduced, and the risk of bubbles caused by uneven resin mixing and affecting the yield of the finished product is reduced; compared with ordinary products, the six planes of this structure are all made of ceramic materials with high thermal conductivity. When different planes of the product are close to the heat source, the disconnection time can be kept consistent, and the customer will not be limited by the location of the heat source during installation.

[0044] In summary, the shell 3 and cover plate 1 of the high voltage arc extinguishing temperature fuse wrap the alloy in a circular shape. Under the action of the magnetic effect of the current, the arc deviates outward from the axis of the temperature sensing body. During the deviating process, it encounters the arc extinguishing rib, which realizes the arc cutting and cooling effect, thereby achieving the arc extinguishing effect; the barrier block of the high voltage arc extinguishing temperature fuse is made into one piece with the shell 3, which not only reduces the cost of product parts, but also reduces the assembly process compared to ordinary products, thereby improving production efficiency; and the shell 3 and cover plate 1 of the high voltage arc extinguishing temperature fuse wrap the electrode in a circular shape, which reduces the alloy flow along the electrode. The risk of accumulation can be avoided, and the product can be prevented from not disconnecting at the set temperature; finally, the high-voltage arc-extinguishing temperature fuse is designed by assembling a cover plate 1 and superimposing a resin seal 5 to replace the original design that relies solely on resin sealing. While the sealing effect remains unchanged, the use of resin is reduced, and the problem of bubbling after baking due to uneven stirring of the resin is reduced; through the cover plate assembly, the six planes of the product are all made of ceramic materials with high thermal conductivity. When different planes of the product are close to the heat source, the disconnection time can be kept consistent, and the customer will not be limited by the location of the heat source during installation.

[0045] The second embodiment of the utility model discloses an electrical device, which comprises a device body and a high-voltage arc-extinguishing temperature fuse as described in any one of the above items, wherein the high-voltage arc-extinguishing temperature fuse is arranged on the device body.

[0046] The above are only preferred implementations of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. All technical solutions under the concept of the present utility model belong to the protection scope of the present utility model.

Claims

1. A high voltage arc extinguishing temperature fuse, characterized in that: It comprises: a shell component, and an electrode component arranged in the shell component; The electrode assembly includes a plurality of temperature-sensitive alloys, a first electrode and a second electrode, each of the temperature-sensitive alloys is welded between the first electrode and the second electrode in parallel and at equal intervals, each of the temperature-sensitive alloys is connected in parallel, and each of the temperature-sensitive alloys has a consistent current-carrying direction, and the temperature-sensitive alloys are configured to resist surge current based on parallel shunting; The temperature-sensitive alloy is concentrically matched with the arc-extinguishing rib of the shell component, the first electrode and the second electrode are overlapped with the anti-piling alloy rib of the shell component, and the first electrode and the second electrode are used to be connected to electrical equipment.

2. A high voltage arc extinguishing thermal fuse according to claim 1, characterized in that: The shell assembly includes a cover plate and an outer shell, the cover plate and the outer shell are overlapped and matched, and the electrode assembly is placed inside the outer shell.

3. A high voltage arc extinguishing thermal fuse according to claim 2, characterized in that: The cover plate and the shell are made of ceramic material.

4. A high voltage arc extinguishing thermal fuse according to claim 2, characterized in that: The cover plate is provided with a cover plate glue dispensing groove, a cover plate arc extinguishing rib and a cover plate anti-piling alloy rib, wherein the temperature sensitive alloy is concentrically matched with the cover plate arc extinguishing rib with a gap of 0.2mm to 0.5mm, and the first electrode, the second electrode and the cover plate anti-piling alloy rib are overlapped and matched.

5. A high voltage arc extinguishing thermal fuse according to claim 4, characterized in that: The shell is provided with shell anti-stacking alloy ribs and shell arc-extinguishing ribs. The temperature-sensitive alloy is concentrically matched with the shell arc-extinguishing ribs with a gap of 0.2mm to 0.5mm. The first electrode, the second electrode and the shell anti-stacking alloy ribs are overlapped and matched. The cover plate anti-stacking alloy ribs and the shell anti-stacking alloy ribs separate each of the temperature-sensitive alloys into multiple separate chambers.

6. A high voltage arc extinguishing thermal fuse according to claim 1, characterized in that: Also included is special grease, which completely wraps each of the temperature-sensitive alloys.

7. A high voltage arc extinguishing thermal fuse according to claim 4, characterized in that: It also includes epoxy resin, which is filled in the glue dispensing groove of the cover plate and the mouth of the shell, and is baked and cured to achieve sealing between the cover plate and the shell.

8. An electrical device, characterized in that: It comprises a device body and a high voltage arc extinguishing temperature fuse as claimed in any one of claims 1 to 7, wherein the high voltage arc extinguishing temperature fuse is arranged on the device body.

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