A high current alloy type temperature fuse

Abstract

This invention relates to the field of thermal fuse technology, and more particularly to a high-current alloy-type thermal fuse. A hollow collecting cavity with an opening is provided at the end of the electrode, with two openings facing each other. The two ends of a fusible alloy are respectively embedded into the two hollow collecting cavities through the openings and electrically connected to each cavity. The volume of the fusible alloy is adapted to the volume of a single hollow collecting cavity, and there is a gap between the two ends of the fusible alloy and the bottom of their respective hollow collecting cavities. When the thermal fuse is heated, the fusible alloy melts and, under the tension of the openings, contracts towards the hollow collecting cavities on both sides, making the two electrodes non-conductive, thereby cutting off the circuit. Furthermore, because the fusible alloy is housed within the hollow collecting cavities, the internal space utilization of the fuse is improved while ensuring reliable connection between the electrodes and the fusible alloy.

Description

Technical Field

[0001] The invention relates to the technical field of temperature fuses, in particular to a large current alloy type temperature fuse. Background Art

[0002] In recent years, with the continuous advancement of electronic technology, circuits have been widely used in our family life. When a circuit fails or is abnormal, the temperature rises sharply along with the continuous increase of current, which may damage some important components in the circuit, burn the circuit or even cause a fire. For this reason, a thermal fuse is often installed in the circuit to protect the circuit.

[0003] The existing alloy-type temperature fuse is mainly composed of fusible alloy, electrodes, fuse, shell, etc. Under normal working conditions, the fusible alloy remains connected to the electrodes on both sides. When the ambient temperature of the circuit is abnormally high, the fusible alloy melts and separates to both sides under the action of the fuse to disconnect the circuit, thereby protecting the circuit.

[0004] At present, in order to ensure reliable connection between the electrode and the fusible alloy, the electrode diameter of the temperature fuse on the market is usually large, resulting in material waste and inconvenience in installation. In addition, the fusible alloy shrinks at both ends of the electrode under the action of the flux, occupying the overall space and having low space utilization. Summary of the invention

[0005] In order to overcome the defects of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a large current alloy type temperature fuse, which can be accommodated in the ends of both electrodes when the fusible alloy is melted, thereby improving the space utilization inside the fuse while ensuring reliable connection between the electrodes and the fusible alloy.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A high-current alloy-type temperature fuse comprises two electrodes that are opposite and spaced apart and a fusible alloy disposed between the two electrodes, wherein the opposite ends of the two electrodes are respectively provided with a hollow collecting cavity with an opening and the two openings are oppositely disposed, and the two ends of the fusible alloy are respectively embedded into the two hollow collecting cavities from the openings and are respectively electrically connected to the two hollow collecting cavities, the volume of the fusible alloy is adapted to the volume of a single hollow collecting cavity, and there is a gap between the two ends of the fusible alloy and the bottom of the respective corresponding hollow collecting cavities.

[0008] Furthermore, the surfaces of both ends of the fusible alloy are coated with flux, and there is a gap between the flux and the bottom of the corresponding hollow collecting cavity.

[0009] Furthermore, the gap ranges from 0.5 mm to 8 mm.

[0010] Furthermore, the side walls of the two hollow collecting cavities are provided with internal threads at the corresponding openings, and the portion of the fusible alloy embedded in the hollow collecting cavity is provided with external threads matching the internal threads.

[0011] Furthermore, the two ends of the fusible alloy are respectively welded to the corresponding openings on the inner side walls of the two hollow collecting cavities.

[0012] Furthermore, ribs are provided on the inner side wall of the hollow collecting cavity corresponding to the opening.

[0013] Furthermore, it also includes a first hollow shell with openings at both ends, and an inwardly protruding annular body is provided in the middle of the first hollow shell. Two electrodes are respectively embedded into the interior of the first hollow shell from the openings at both ends of the first hollow shell and respectively abut against both sides of the annular body. The annular body is sleeved on the middle outer surface of the fusible alloy.

[0014] Furthermore, it also includes a sealing resin, which is arranged at the opening of the first hollow shell to close the opening and coat the outer surface of the hollow collecting cavity of the electrode.

[0015] Furthermore, the first hollow shell is made of a heat-fixing plastic packaging material.

[0016] Furthermore, the inner shape of the first hollow shell is adapted to the outer shape of the hollow collecting cavity.

[0017] Furthermore, it also includes an annular insulating sleeve and a second hollow shell, wherein the insulating sleeve is embedded between the two electrodes and contacts the two electrodes respectively, and the second hollow shell covers the hollow collecting cavity of the electrode and the outer surface of the insulating sleeve.

[0018] Furthermore, the insulating sleeve is made of ceramic or plastic, and the second hollow shell is made of a heat-fixed plastic sealing material.

[0019] Furthermore, the inner shape of the second hollow shell is adapted to the outer shape of the hollow collecting cavity.

[0020] Furthermore, the inner shape of the hollow collecting cavity is adapted to the outer shape of the fusible alloy.

[0021] Furthermore, the inner shape of the hollow collecting cavity is cylindrical, conical or bowl-shaped.

[0022] Furthermore, the fusible alloy has a hollow structure.

[0023] The beneficial effects of the present invention are:

[0024] The present invention provides a high-current alloy-type temperature fuse, which has a hollow collection cavity with an opening at the end of the electrode and two openings arranged opposite to each other. The two ends of the fusible alloy are respectively embedded in the two hollow collection cavities from the openings and are respectively electrically connected to the two hollow collection cavities. The volume of the fusible alloy is adapted to the volume of a single hollow collection cavity, and there is a gap between the two ends of the fusible alloy and the bottom of the corresponding hollow collection cavity. When the temperature fuse is heated, the fusible alloy melts and, under the action of the opening tension, the fusible alloy shrinks toward the hollow collection cavities on both sides so that the two electrodes are non-conductive, thereby achieving the effect of cutting off the circuit. And because the fusible alloy is contained in the hollow collection cavity, the space utilization rate inside the fuse is improved while ensuring the reliable connection between the electrode and the fusible alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Shown is an exploded view of a large current alloy type temperature fuse of the present invention;

[0026] Figure 2 The figure shows a structural schematic diagram of a large current alloy type temperature fuse before it is blown in the present invention;

[0027] Figure 3 The figure shows a schematic structural diagram of a large current alloy type temperature fuse after it is fused;

[0028] Figure 4 Shown is a structural schematic diagram of a large current alloy type temperature fuse of the present invention;

[0029] Description of labels:

[0030] 1. a first hollow shell; 11. a ring body;

[0031] 2. electrode; 21. hollow collecting cavity; 211. opening;

[0032] 3. Sealing resin;

[0033] 4. Flux cutter;

[0034] 5. Fusible alloy;

[0035] 6. Insulation sleeve;

[0036] 7. A second hollow shell. DETAILED DESCRIPTION

[0037] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0038] Please refer to Figures 1 to 4As shown, a large current alloy type temperature fuse provided by the present invention comprises two electrodes that are opposite and spaced apart and a fusible alloy disposed between the two electrodes, wherein the opposite ends of the two electrodes are respectively provided with a hollow collecting cavity with an opening and the two openings are oppositely disposed, and the two ends of the fusible alloy are respectively embedded into the two hollow collecting cavities from the openings and are respectively electrically connected to the two hollow collecting cavities, the volume of the fusible alloy is adapted to the volume of a single hollow collecting cavity, and there is a gap between the two ends of the fusible alloy and the bottom of each corresponding hollow collecting cavity.

[0039] The beneficial effects of the present invention are:

[0040] The present invention provides a high-current alloy-type temperature fuse, which has a hollow collection cavity with an opening at the end of the electrode and two openings arranged opposite to each other. The two ends of the fusible alloy are respectively embedded in the two hollow collection cavities from the openings and are respectively electrically connected to the two hollow collection cavities. The volume of the fusible alloy is adapted to the volume of a single hollow collection cavity, and there is a gap between the two ends of the fusible alloy and the bottom of the corresponding hollow collection cavity. When the temperature fuse is heated, the fusible alloy melts and, under the action of the opening tension, the fusible alloy shrinks toward the hollow collection cavities on both sides so that the two electrodes are non-conductive, thereby achieving the effect of cutting off the circuit. And because the fusible alloy is contained in the hollow collection cavity, the space utilization rate inside the fuse is improved while ensuring the reliable connection between the electrode and the fusible alloy.

[0041] Furthermore, the surfaces of both ends of the fusible alloy are coated with flux, and there is a gap between the flux and the bottom of the corresponding hollow collecting cavity.

[0042] From the above description, it can be seen that by adding a flux, the tension of the liquid metal at the interface of the fusible alloy in the molten state can be greatly enhanced, causing it to shrink rapidly into the hollow collection cavity, which is particularly suitable for high current scenarios.

[0043] Furthermore, the gap ranges from 0.5 mm to 8 mm.

[0044] From the above description, it can be seen that through the above parameters, the electrical performance and volume size of the product can reach a certain balance, and the effect is optimal.

[0045] Furthermore, the side walls of the two hollow collecting cavities are provided with internal threads at the corresponding openings, and the portion of the fusible alloy embedded in the hollow collecting cavity is provided with external threads matching the internal threads.

[0046] From the above description, it can be seen that through the cooperation of the internal thread and the external thread, the fusible alloy can be fixedly connected to the hollow collecting cavity, and the contact resistance is very low, which is conducive to electrical conduction.

[0047] Furthermore, the two ends of the fusible alloy are respectively welded to the corresponding openings on the inner side walls of the two hollow collecting cavities.

[0048] From the above description, it can be seen that the fusible alloy is fixedly connected to the hollow collecting cavities at both ends through the welding process, which is structurally stable and also conducive to electrical conduction.

[0049] Furthermore, ribs are provided on the inner side wall of the hollow collecting cavity corresponding to the opening.

[0050] From the above description, it can be seen that providing ribs can not only improve the structural strength, but also improve the electrical conductivity.

[0051] Furthermore, it also includes a first hollow shell with openings at both ends, and an inwardly protruding annular body is provided in the middle of the first hollow shell. Two electrodes are respectively embedded into the interior of the first hollow shell from the openings at both ends of the first hollow shell and respectively abut against both sides of the annular body. The annular body is sleeved on the middle outer surface of the fusible alloy.

[0052] From the above description, it can be seen that the provision of an annular body can ensure that the two electrodes do not touch each other and maintain a certain distance between them. The distance can be set according to the minimum electrical gap, thereby greatly saving the space of the two electrodes and improving space utilization.

[0053] Furthermore, it also includes a sealing resin, which is arranged at the opening of the first hollow shell to close the opening and coat the outer surface of the hollow collecting cavity of the electrode.

[0054] It can be seen from the above description that the sealing resin is provided to play a sealing role.

[0055] Furthermore, the first hollow shell is made of a heat-fixing plastic packaging material.

[0056] From the above description, it can be seen that this material is beneficial to improving product quality.

[0057] Furthermore, the inner shape of the first hollow shell is adapted to the outer shape of the hollow collecting cavity.

[0058] From the above description, it can be seen that the first hollow shell and the hollow collecting cavity fit perfectly, which is beneficial to improving product quality.

[0059] Furthermore, it also includes an annular insulating sleeve and a second hollow shell, wherein the insulating sleeve is embedded between the two electrodes and contacts the two electrodes respectively, and the second hollow shell covers the hollow collecting cavity of the electrode and the outer surface of the insulating sleeve.

[0060] From the above description, it can be seen that the provision of an insulating sleeve can ensure that the two electrodes do not touch each other and maintain a certain distance between them. The distance can be set according to the minimum electrical gap, thereby greatly saving the space of the two electrodes and improving space utilization.

[0061] Furthermore, the insulating sleeve is made of ceramic or plastic, and the second hollow shell is made of a heat-fixed plastic sealing material.

[0062] From the above description, it can be seen that the use of the above materials is conducive to improving product quality.

[0063] Furthermore, the inner shape of the second hollow shell is adapted to the outer shape of the hollow collecting cavity.

[0064] From the above description, it can be seen that the second hollow shell and the hollow collecting cavity fit perfectly, which is beneficial to improving product quality.

[0065] Furthermore, the inner shape of the hollow collecting cavity is adapted to the outer shape of the fusible alloy.

[0066] Furthermore, the inner shape of the hollow collecting cavity is cylindrical, conical or bowl-shaped.

[0067] Furthermore, the fusible alloy has a hollow structure.

[0068] Please refer to Figures 1 to 4 As shown, the first embodiment of the present invention is:

[0069] like Figure 1 As shown, a large current alloy type temperature fuse provided by the present invention comprises two electrodes 2 arranged oppositely and spaced apart and a fusible alloy 5 arranged between the two electrodes 2, the opposite ends of the two electrodes 2 are respectively provided with a hollow collecting cavity 21 with an opening, the two openings 211 are arranged oppositely and the caliber range of the opening is 1mm-15mm, the two ends of the fusible alloy 5 are respectively embedded in the two hollow collecting cavities 21 from the openings and are respectively electrically connected to the two hollow collecting cavities, the volume of the fusible alloy is adapted to the volume of a single hollow collecting cavity, and there is a gap between the two ends of the fusible alloy and the bottom of the respective corresponding hollow collecting cavities. The range of the gap is 0.5mm-8mm.

[0070] In this embodiment, the inner shape of the hollow collecting cavity is adapted to the outer shape of the fusible alloy. The inner shape of the hollow collecting cavity is cylindrical, conical or bowl-shaped. The fusible alloy is a hollow structure, and of course it can also be a solid structure. The fusible alloy is cylindrical, flat or hollow cylindrical, and the space utilization rate is high.

[0071] The two end surfaces of the fusible alloy 5 are coated with a flux 4, and there is a gap between the flux and the bottom of the corresponding hollow collecting cavity. By adding a flux, the tension of the liquid metal at the interface of the fusible alloy in the molten state can be greatly enhanced, so that it can quickly shrink toward the hollow collecting cavity, which is particularly suitable for high current scenarios. Among them, the flux can be an existing product that can achieve a fluxing effect.

[0072] In this scheme, there are two ways to connect the fusible alloy and the hollow collection cavity:

[0073] The first type: the side walls of the two hollow collecting cavities have internal threads at the corresponding openings, and the portion of the fusible alloy embedded in the hollow collecting cavity has external threads that match the internal threads. Through the cooperation of the internal threads and the external threads, the fusible alloy can be fixedly connected to the hollow collecting cavity, and the contact resistance is very low, which is conducive to electrical conduction.

[0074] The second method: the two ends of the fusible alloy are respectively welded to the corresponding openings of the inner side walls of the two hollow collecting cavities. The fusible alloy is fixedly connected to the hollow collecting cavities at both ends by welding, which is structurally stable and also conducive to electrical conduction.

[0075] Of course, it is not limited to the above two methods.

[0076] The inner wall of the hollow collecting cavity is provided with ribs at the opening corresponding to the inner wall. The ribs can not only improve the structural strength, but also improve the electrical conductivity. The number of ribs can be set according to actual needs, and they are evenly spaced along the opening.

[0077] The above-mentioned high-current alloy type temperature fuse also includes a shell. In this embodiment, two different shell structures are designed, as follows:

[0078] like Figure 2-3As shown, the first type of shell: a first hollow shell 1 with openings at both ends, a ring body 11 protruding inward is provided in the middle of the first hollow shell 1, the ring body is an integrally formed structure, two electrodes are respectively embedded into the first hollow shell from the openings at both ends of the first hollow shell and respectively abut against the two sides of the ring body, and the ring body is sleeved on the middle outer surface of the fusible alloy. The provision of the ring body can ensure that the two electrodes do not contact and maintain a certain distance between them, and the distance can be set according to the minimum electrical gap, thereby greatly saving the space of the two electrodes and improving the space utilization rate. For example: Clause 10.1 of the national standard GB / T9816.1-2013 stipulates that the minimum electrical gap is 1.5mm at a rated voltage of 250V, so the gap between the two electrodes needs to be at least 1.5mm, plus the size of the fusible alloy after shrinkage, taking the fusible alloy single-side shrinkage size of 0.5mm as an example, at least 1mm of space can be saved; if a larger size of fusible alloy is used, the shrinkage size increases, and the space saved is greater. It also includes a sealing resin 3, which is arranged at the opening of the first hollow shell to close the opening and cover the outer surface of the hollow collecting cavity of the electrode. The sealing resin is arranged to play a sealing role.

[0079] The material of the first hollow shell is a heat-fixed plastic sealing material. The internal shape of the first hollow shell is adapted to the external shape of the hollow collecting cavity. The first hollow shell and the hollow collecting cavity fit perfectly, which is conducive to improving product quality.

[0080] like Figure 4 As shown, the second shell is composed of a ring-shaped insulating sleeve 6 and a second hollow shell 7, wherein the insulating sleeve is embedded between the two electrodes and contacts the two electrodes respectively, and the second hollow shell is coated on the hollow collecting cavity of the electrode and the outer surface of the insulating sleeve. The insulating sleeve can ensure that the two electrodes do not contact and maintain a certain distance between them. The distance can be set according to the minimum electrical gap, thereby greatly saving the space of the two electrodes and improving the space utilization rate. For example: Clause 10.1 of the national standard GB / T 9816.1-2013 stipulates that the minimum electrical gap is 1.5mm at a rated voltage of 250V, so the gap between the two electrodes needs to be at least 1.5mm, plus the size of the fusible alloy after shrinkage, taking the fusible alloy single-sided shrinkage size of 0.5mm as an example, at least 1mm of space can be saved; if a larger fusible alloy is used, the shrinkage size increases, and the space saved is greater.

[0081] The insulating sleeve is made of ceramic or plastic, and the second hollow shell is made of heat-fixed plastic material. The inner shape of the second hollow shell is adapted to the outer shape of the hollow collection cavity. The second hollow shell fits perfectly with the hollow collection cavity, which is conducive to improving product quality.

[0082] In summary, the present invention provides a high-current alloy-type temperature fuse, which adopts a hollow collection cavity structure. After the fusible alloy is melted, it quickly shrinks inside the cavity, which greatly saves the space between the two electrodes and improves the space utilization efficiency. Ribs are provided in the cavity, and the fusible alloy can be embedded in the electrode cavity or connected by welding, etc., and the contact resistance is very low. The flux is coated on the electrode cavity, which enhances the tension of the liquid metal at the interface when the fusible alloy is in a molten state, so that it quickly shrinks into the cavity, which is particularly suitable for high current scenarios. The cavity shape can be cylindrical, conical or bowl-shaped, etc., so that the melting shape of the fusible alloy (fuse) is stable, and the reliability is improved.

[0083] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A high current alloy type temperature fuse, comprising two electrodes arranged opposite to each other and spaced apart and a fusible alloy arranged between the two electrodes, characterized in that: The two electrodes have two opposite ends each provided with a hollow collecting cavity with an opening, and the two openings are arranged opposite to each other. The two ends of the fusible alloy are respectively embedded in the two hollow collecting cavities from the openings and are electrically connected to the two hollow collecting cavities respectively. The volume of the fusible alloy is adapted to the volume of a single hollow collecting cavity, and there is a gap between the two ends of the fusible alloy and the bottom of the corresponding hollow collecting cavity. It also includes a first hollow shell with openings at both ends, a ring body protruding inwardly is provided in the middle of the first hollow shell, two electrodes are respectively embedded into the first hollow shell from the openings at both ends of the first hollow shell and respectively abut against two sides of the ring body, and the ring body is sleeved on the outer surface of the middle part of the fusible alloy; Alternatively, it also includes an annular insulating sleeve and a second hollow shell, wherein the insulating sleeve is embedded between the two electrodes and contacts the two electrodes respectively, and the second hollow shell covers the hollow collecting cavity of the electrode and the outer surface of the insulating sleeve; The surfaces of both ends of the fusible alloy are coated with flux, and there is a gap between the flux and the bottom of the corresponding hollow collecting cavity.

2. A high current alloy type thermal fuse according to claim 1, characterized in that: The gap ranges from 0.5 mm to 8 mm.

3. A high current alloy type thermal fuse according to claim 1, characterized in that: Internal threads are arranged at the corresponding openings of the side walls of the two hollow collecting cavities, and external threads matching with the internal threads are arranged on the portion of the fusible alloy embedded in the hollow collecting cavity.

4. A high current alloy type thermal fuse according to claim 1, characterized in that: The two ends of the fusible alloy are respectively welded to the corresponding openings of the inner side walls of the two hollow collecting cavities.

5. A high current alloy type thermal fuse according to claim 1, characterized in that: Ribs are arranged on the inner side wall of the hollow collecting cavity at positions corresponding to the openings.

6. A high current alloy type thermal fuse according to claim 1, characterized in that: It also includes a sealing resin, which is arranged at the opening of the first hollow shell to close the opening and cover the outer surface of the hollow collecting cavity of the electrode.

7. A high current alloy type thermal fuse according to claim 1, characterized in that: The first hollow shell is made of heat-fixed plastic packaging material.

8. A high current alloy type thermal fuse according to claim 1, characterized in that: The inner shape of the first hollow shell is adapted to the outer shape of the hollow collecting cavity.

9. A high current alloy type thermal fuse according to claim 1, characterized in that: The insulating sleeve is made of ceramic or plastic, and the second hollow shell is made of heat-fixed plastic sealing material.

10. A high current alloy type thermal fuse according to claim 1, characterized in that: The inner shape of the second hollow shell is adapted to the outer shape of the hollow collecting chamber.

11. A high current alloy type thermal fuse according to claim 1, characterized in that: The inner shape of the hollow collecting cavity is adapted to the outer shape of the fusible alloy.

12. A high current alloy type thermal fuse according to claim 11, characterized in that: The inner shape of the hollow collecting cavity is cylindrical, conical or bowl-shaped.

13. A high current alloy type thermal fuse according to claim 1, characterized in that: The fusible alloy has a hollow structure.

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