Silver contact melting type thermal fuse

Abstract

The utility model relates to the technical field of fuses, and discloses a silver contact melting type thermal fuse which comprises a metal shell, a first lead wire is installed on the left side of the metal shell, a second lead wire is installed on the right side of the metal shell, epoxy resin is installed on the left side of the metal shell, and a silver contact melting type thermal fuse is installed on the right side of the metal shell. An insulator is installed on the left side of the interior of the metal shell, a circuit breaking spring is installed outside the insulator, a star-shaped reed is installed on the right side of the insulator, a compression spring is arranged on the right side of the star-shaped reed, and round pieces are fixedly connected to the two sides of the compression spring. The silver contact melting type thermal fuse is provided with the silver contact, the silver contact has excellent electrical conductivity and contact performance, the heat conduction ring and the heat conduction film can enhance the heat conduction efficiency of the lead, the fuse can rapidly raise the temperature to a set value when in use, the fusing efficiency of a temperature sensing frit in the fuse is accelerated, and the fuse is convenient to use. Therefore, the consistency of the overall resistance value is improved, and the problem of poor temperature sensing and response effects is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuses, in particular to a silver contact melting type thermal fuse. Background Art

[0002] A thermal fuse is an electrical device that uses the heat generated by itself to melt the fuse and disconnect the circuit when the current exceeds the specified value. A fuse is a current protector made based on the principle that after the current exceeds the specified value for a period of time, the heat generated by itself will melt the fuse and disconnect the circuit.

[0003] Common thermal fuses perform poorly in terms of temperature perception and response speed. They are unable to accurately sense temperature anomalies and quickly blow in a short period of time, which may cause electrical equipment to suffer overheating damage.

[0004] There is an urgent need for a silver contact melting type thermal fuse to solve the technical defects proposed in the above technology. Utility Model Content

[0005] The purpose of the present utility model is to provide a silver contact melting type thermal fuse to solve the problem of poor temperature sensing and response effects raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a silver contact melting type thermal fuse, comprising a metal shell, a first lead installed on the left side of the metal shell, a second lead installed on the right side of the metal shell, epoxy resin installed on the left side of the metal shell, an insulator installed on the left side of the interior of the metal shell, a circuit breaker spring installed on the outside of the insulator, a star-shaped spring installed on the right side of the insulator, a compression spring provided on the right side of the star-shaped spring, discs fixedly connected to both sides of the compression spring, a temperature-sensitive frit installed on the right side of the interior of the metal shell, a silver contact installed on the left side of the first lead, a heat-conducting film installed on the outside of the first lead, and a heat-conducting ring installed on the outside of the heat-conducting film.

[0007] Preferably, two groups of the heat-conducting rings are provided, and the heat-conducting rings are sleeved on the outside of the first lead.

[0008] Preferably, the right side of the circuit breaker spring is in contact with the left side of the star-shaped spring leaf.

[0009] Preferably, the first lead wire passes through the metal shell and is embedded in the insulator.

[0010] Preferably, a thickening layer is installed on the outside of the metal shell, and a corrosion-resistant layer is installed on the outside of the thickening layer.

[0011] Preferably, two groups of discs are provided, and the discs are respectively attached to the right side of the star-shaped spring and the left side of the temperature-sensitive frit.

[0012] Compared with the prior art, the beneficial effects of the present invention are: the silver contact melting type thermal fuse not only realizes the function of improving the temperature sensing effect and enhancing the protection effect, but also realizes the functions of efficient circuit breaking and durability;

[0013] The first lead, the temperature-sensitive frit, the heat-conducting ring, the heat-conducting film, and the silver contact are provided. The silver contact is installed on the first lead. Since the silver contact has excellent electrical conductivity and contact performance, the heat-conducting ring and the heat-conducting film on the first lead can enhance the heat conduction efficiency of the lead. When in use, the fuse can quickly raise the temperature to the set value, speeding up the melting efficiency of the temperature-sensitive frit inside the fuse, thereby improving the consistency of the overall resistance value. This structure realizes the function of facilitating the improvement of the sensing effect.

[0014] By providing epoxy resin, metal shell, corrosion-resistant layer and thickening layer, the epoxy resin on the metal shell can protect one end, the corrosion-resistant layer on the metal shell wrapped on the outermost side can prevent the problem of internal damage caused by corrosive materials penetrating the metal shell of the thermal fuse, and the thickening layer can prevent the thermal fuse from being scratched and affecting normal use. This structure realizes the function of enhancing the protection effect;

[0015] By providing a circuit-breaking spring, a compression spring and a disc, the first lead on the thermal fuse can conduct heat into the interior of the metal shell. After the temperature of the thermal fuse rises, the temperature-sensitive melting block inside the metal shell will melt, thereby disconnecting the circuit. After the temperature-sensitive melting block is disconnected, the circuit-breaking spring and the compression spring extend. The disc on the compression spring can improve the efficiency of the circuit-breaking. This structure achieves the functions of efficient circuit breaking and durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the front cross-sectional structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the partial structure of the lead wire of the present invention;

[0018] Figure 3 For the utility model Figure 1 A in the middle is an enlarged structural diagram;

[0019] Figure 4 This is a front view structural diagram of the insulator of the present invention.

[0020] In the figure: 1. First lead; 2. Epoxy resin; 3. Insulator; 4. Circuit breaker spring; 5. Star-shaped spring; 6. Compression spring; 7. Disc; 8. Temperature-sensing frit; 9. Second lead; 10. Metal casing; 11. Thermal ring; 12. Thermal film; 13. Silver contact; 14. Corrosion-resistant layer; 15. Thickening layer. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figure 1-4 A silver contact melting type thermal fuse includes a metal shell 10, a first lead 1 is installed on the left side of the metal shell 10, a second lead 9 is installed on the right side of the metal shell 10, an epoxy resin 2 is installed on the left side of the metal shell 10, an insulator 3 is installed on the left side of the inside of the metal shell 10, a circuit breaker spring 4 is installed on the outside of the insulator 3, a star-shaped spring 5 is installed on the right side of the insulator 3, a compression spring 6 is provided on the right side of the star-shaped spring 5, and a disc 7 is fixedly connected to both sides of the compression spring 6, a temperature-sensitive frit 8 is installed on the right side of the inside of the metal shell 10, a silver contact 13 is installed on the left side of the first lead 1, a heat-conducting film 12 is installed on the outside of the first lead 1, and a heat-conducting ring 11 is installed on the outside of the heat-conducting film 12;

[0023] There are two sets of heat-conducting rings 11, which are sleeved on the outside of the first lead 1, and the right side of the circuit-breaking spring 4 is in contact with the left side of the star-shaped spring 5;

[0024] Specifically, if Figure 1 and Figure 2 As shown, the silver contact 13 has excellent electrical conductivity and contact performance. The thermal conductive ring 11 and the thermal conductive film 12 on the first lead 1 can enhance the thermal conductivity efficiency of the lead. When the fuse is in use, the temperature can be quickly raised to the set value, which speeds up the melting efficiency of the temperature-sensitive frit 8 inside the fuse, thereby improving the consistency of the overall resistance value.

[0025] Example 2: The first lead 1 passes through the metal housing 10 and is embedded in the insulator 3. Two groups of discs 7 are provided, and the discs 7 are respectively attached to the right side of the star-shaped spring 5 and the left side of the temperature-sensitive frit 8;

[0026] Specifically, if Figure 1 and Figure 3 As shown, heat is introduced into the interior of the metal housing 10. After the temperature of the thermal fuse rises, the temperature-sensitive frit 8 inside the metal housing 10 will melt, thereby disconnecting the circuit. After the temperature-sensitive frit 8 is disconnected, the circuit-breaking spring 4 and the compression spring 6 extend, and the disc 7 on the compression spring 6 can improve the efficiency of the circuit-breaking.

[0027] Example 3: A thickening layer 15 is installed on the outside of the metal shell 10, and a corrosion-resistant layer 14 is installed on the outside of the thickening layer 15;

[0028] Specifically, if Figure 1 and Figure 4 As shown, the epoxy resin 2 on the metal shell 10 can protect one end, and the corrosion-resistant layer 14 on the metal shell 10 wrapped on the outermost side can prevent the internal damage caused by the corrosive material penetrating the metal shell 10 of the thermal fuse, and the thickened layer 15 can prevent the thermal fuse from being scratched and affecting normal use.

[0029] Working Principle: When the present invention is in use, the first lead 1 on the thermal fuse can conduct heat into the interior of the metal shell 10. After the temperature of the thermal fuse rises, the temperature-sensitive frit 8 inside the metal shell 10 will melt, thereby disconnecting the circuit. After the temperature-sensitive frit 8 disconnects, the circuit-breaking spring 4 and the compression spring 6 extend. The disc 7 on the compression spring 6 can improve the efficiency of the circuit-breaking. Silver contacts, as contact materials, have excellent conductivity and contact performance. The fuse uses silver contacts made of composite silver material to quickly melt when the temperature reaches the set value, ensuring that the current can be quickly and reliably interrupted when needed. The melting point of the fuse element is increased, and the consistency of the overall resistance value is improved. The epoxy resin 2 on the metal shell 10 can protect one end. The corrosion-resistant layer 14 on the metal shell 10 wrapped on the outermost surface can prevent the problem of internal damage caused by corrosive materials penetrating the metal shell 10 of the thermal fuse. The thickened layer 15 can prevent the thermal fuse from being scratched and affecting normal use.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A silver contact melting type thermal fuse, comprising a metal housing (10), characterized in that: A first lead (1) is installed on the left side of the metal shell (10), a second lead (9) is installed on the right side of the metal shell (10), an epoxy resin (2) is installed on the left side of the metal shell (10), an insulator (3) is installed on the left side of the inside of the metal shell (10), a circuit breaker spring (4) is installed on the outside of the insulator (3), a star-shaped spring (5) is installed on the right side of the insulator (3), a compression spring (6) is provided on the right side of the star-shaped spring (5), and discs (7) are fixedly connected to both sides of the compression spring (6), a temperature-sensitive melting block (8) is installed on the right side of the inside of the metal shell (10), a silver contact (13) is installed on the left side of the first lead (1), a heat-conducting film (12) is installed on the outside of the first lead (1), and a heat-conducting ring (11) is installed on the outside of the heat-conducting film (12).

2. The silver contact melting type thermal fuse according to claim 1, characterized in that: Two groups of the heat-conducting rings (11) are provided, and the heat-conducting rings (11) are sleeved on the outside of the first lead (1).

3. The silver contact melting type thermal fuse according to claim 1, characterized in that: The right side of the circuit breaker spring (4) is in contact with the left side of the star-shaped spring leaf (5).

4. The silver contact melting type thermal fuse according to claim 1, characterized in that: The first lead (1) passes through the metal shell (10) and is embedded in the interior of the insulator (3).

5. The silver contact melting type thermal fuse according to claim 1, characterized in that: A thickening layer (15) is installed on the outside of the metal shell (10), and a corrosion-resistant layer (14) is installed on the outside of the thickening layer (15).

6. The silver contact melting type thermal fuse according to claim 1, characterized in that: Two groups of the discs (7) are provided, and the discs (7) are respectively attached to the right side of the star-shaped spring (5) and the left side of the temperature-sensitive frit (8).

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