Telescopic fuse

Abstract

The utility model discloses a telescopic fuse, which relates to the technical field of fuses and comprises a fuse tube, two fuse fixing seats and a fusing metal wire, the two fuse fixing seats are respectively mounted at two ends of the fuse tube, and the fuse tube and the two fuse fixing seats form a sealed space. The fuse metal wire is installed between the two fuse fixing seats and located in the fuse tube, conductive columns are installed at the tails of the fuse fixing seats, conductive clamping structures are installed outside the conductive columns, and distance supporting structures are installed on the side wall surfaces of the conductive clamping structures; a conductive extension structure is mounted on the lower wall surface of the conductive clamping structure; according to the utility model, under the condition that the length of the fuse can be adjusted, the maximum resistance of the whole fuse can be ensured to be in the fuse wire part, when large current appears in a circuit, the fuse wire can be accurately fused, and the whole safety of the circuit can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of fuses, in particular to a retractable fuse. Background Art

[0002] A fuse refers to an electrical appliance that melts a fuse wire by the heat generated by itself to disconnect the circuit when the current exceeds a specified value. A fuse is based on the principle that after the current exceeds the specified value for a period of time, it melts the fuse wire with the heat generated by itself, thereby disconnecting the circuit; a current protector made using this principle. Fuses are widely used in high and low voltage power distribution systems, control systems, and electrical equipment. As short-circuit and over-current protectors, they are one of the most commonly used protection devices.

[0003] Existing fuses need to be replaced after fusing. The length of the fuse is fixed and cannot adapt to fuse sockets of different lengths, resulting in poor adaptability. To solve this problem, fuses that can adjust their length have emerged. However, there will be tiny gaps inside the length adjustment structure of these fuses. These gaps will cause an increase in resistance, thereby changing the fusing point and reducing the safety of the fuse. Summary of the Invention

[0004] The purpose of the utility model is to solve the defects existing in the prior art and propose a retractable fuse.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A retractable fuse includes: a fuse tube, two fuse holders, and a fuse wire. The two fuse holders are respectively installed at both ends of the fuse tube, and the fuse tube and the two fuse holders form a sealed space. The fuse wire is installed between the two fuse holders and is located inside the fuse tube. A conductive column is installed at the tail of the fuse holder, a conductive clamping structure is installed outside the conductive column, a distance support structure is installed on the side wall surface of the conductive clamping structure, and a conductive extension structure is installed on the lower wall surface of the conductive clamping structure; the conductive clamping structure includes: two conductive hoops, two clamping bolts, and two stabilizing seats; the two conductive hoops are respectively located outside the conductive column, and the two conductive hoops are fixed by two clamping bolts in a threaded locking manner, and the two stabilizing seats are respectively installed outside the two conductive hoops.

[0007] The utility model is further configured such that the distance support structure includes: a distance support base, a rotating seat, and a distance bolt; the distance support base is installed outside the stable seat, the rotating seat is installed on the lower wall surface of the fuse fixing seat, the distance bolt is movably installed inside the distance support base through threads, and one end of the distance bolt is fixed inside the rotating seat.

[0008] The utility model is further configured such that the conductive extension structure includes: two conductive bars and a conductive ring; the two conductive bars are respectively installed on the lower wall surface of the conductive hoop, and the conductive ring is installed on the lower wall surface of the two conductive bars.

[0009] The utility model is further configured such that a fuse mounting seat is installed inside the conductive ring.

[0010] The utility model is further configured such that the two clamping bolts are cross recessed head bolts.

[0011] The utility model is further configured such that the distance bolt is an external hexagonal bolt.

[0012] The utility model is further configured such that the sealed space formed by the fuse tube and the two fuse fixing seats is filled with high-temperature resistant particles.

[0013] The beneficial effects of the utility model are as follows: while ensuring the function of the fuse to adjust its length, the utility model can also ensure that the place with the largest overall resistance of the fuse is at the fuse wire part, which can ensure that when a large current appears inside the circuit, the fuse wire will accurately melt at the fuse wire part, thus ensuring the overall safety of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the overall structure of a retractable fuse proposed by the utility model;

[0015] Figure 2 is an exploded schematic diagram of the partial structure of a retractable fuse proposed by the utility model;

[0016] Figure 3 is a schematic diagram of the length adjustment structure of a retractable fuse proposed by the utility model;

[0017] Figure 4 is a schematic diagram of the conductive clamping structure of a retractable fuse proposed by the utility model.

[0018] In the figure: 1, fuse tube; 2, fuse fixing seat; 3, fuse wire; 4, conductive column; 5, conductive hoop; 6, clamping bolt; 7, stable seat; 8, distance support base; 9, rotating seat; 10, distance bolt; 11, conductive bar; 12, conductive ring; 13, fuse mounting seat. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The technical solution of this patent will be further described in detail below in conjunction with specific embodiments.

[0020] The embodiments of this patent will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain this patent and should not be construed as a limitation of this patent.

[0021] In the description of this patent, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this patent.

[0022] In the description of this patent, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "set" should be understood in a broad sense. For example, it can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0023] Refer to Figures 1-4, A retractable fuse, comprising: a fuse tube 1, two fuse holders 2, and a fuse wire 3. The two fuse holders 2 are respectively installed at both ends of the fuse tube 1, and the fuse tube 1 and the two fuse holders 2 form a sealed space. The fuse wire 3 is installed between the two fuse holders 2 and is located inside the fuse tube 1. A conductive post 4 is installed at the tail of the fuse holder 2, a conductive clamping structure is installed outside the conductive post 4, a distance support structure is installed on the side wall surface of the conductive clamping structure, and a conductive extension structure is installed on the lower wall surface of the conductive clamping structure; The conductive clamping structure includes: two conductive hoops 5, two clamping bolts 6, and two stable seats 7; The two conductive hoops 5 are respectively located outside the conductive post 4, and the two conductive hoops 5 are fixed by the two clamping bolts 6 in a threaded locking manner. The two stable seats 7 are respectively installed outside the two conductive hoops 5. The two clamping bolts 6 are cross recessed head bolts. The sealed space formed by the fuse tube 1 and the two fuse holders 2 is filled with high-temperature resistant particles; The conductive clamping structure can make the extended part of the fuse have no gap, ensure the smooth passage of current, avoid the increase of resistance, thus ensuring the accurate fusing position of the fuse and guaranteeing the circuit safety. At the same time, the high-temperature resistant particles can prevent the molten fuse wire 3 from dripping randomly and avoid fire.

[0024] Specifically, the distance support structure includes: a distance support seat 8, a rotating seat 9, and a distance bolt 10; The distance support seat 8 is installed outside the stable seat 7, the rotating seat 9 is installed on the lower wall surface of the fuse holder 2, the distance bolt 10 is movably installed inside the distance support seat 8 by threads, and one end of the distance bolt 10 is fixed inside the rotating seat 9. The distance bolt 10 is an external hexagonal bolt. The distance support structure can keep the present utility model after adjusting the length and prevent the length from changing to cause a short circuit in the circuit.

[0025] Specifically, the conductive extension structure includes: two conductive bars 11 and a conductive ring 12; The two conductive bars 11 are respectively installed on the lower wall surface of the conductive hoop 5, the conductive ring 12 is installed on the lower wall surface of the two conductive bars 11, and a fuse mounting seat 13 is installed inside the conductive ring 12. The conductive extension structure can make the current pass stably through the length adjustment part of the present utility model and prevent the local resistance from being too large.

[0026] Working principle: The utility model can adjust the length of the fuse body according to specific usage conditions to suit the usage conditions. When performing specific operations, the operator loosens the two clamping bolts 6 respectively with a Phillips screwdriver, creating a certain gap between the two conductive collars 5 and the conductive column 4. At this time, the operator turns the distance bolt 10 with an external hexagon wrench, causing the distance bolt 10 to rotate inside the rotating seat 9. Under the action of the thread, the two conductive collars 5 can linearly move outside the conductive column 4. When the two conductive collars 5 are in the appropriate positions on the conductive column 4, the operator can tighten the two clamping bolts 6 to tightly fasten the two conductive collars 5 outside the conductive column 4. At this time, the adjustment of the length of the fuse body is completed. After the fuse body is installed, the current will pass through the fuse fixing seat 2, the fusing wire 3, the fuse fixing seat 2, the conductive column 4, the two conductive collars 5, the two conductive bars 11, and the fuse mounting seat 13 in sequence. When the current is too large, the fusing wire 3 with the largest resistance will melt, disconnecting the circuit for installation protection.

[0027] The above is only the preferred specific implementation mode of the utility model, but the protection scope of the utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the utility model, according to the technical solution of the utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the utility model.

Claims

1. A retractable fuse, comprising: A fuse tube (1), two fuse holders (2) and a fusible metal wire (3), wherein the two fuse holders (2) are respectively mounted at two ends of the fuse tube (1), and the fuse tube (1) and the two fuse holders (2) form a sealed space, the fusible metal wire (3) is mounted between the two fuse holders (2), and the fusible metal wire (3) is located inside the fuse tube (1), characterized in that a conductive column (4) is mounted at the tail of the fuse holder (2), a conductive clamping structure is mounted outside the conductive column (4), a distance support structure is mounted on the side wall of the conductive clamping structure, and a conductive extension structure is mounted on the lower wall of the conductive clamping structure; The conductive clamping structure comprises: two conductive hoops (5), two clamping bolts (6) and two stabilizing seats (7); The two conductive hoops (5) are respectively located outside the conductive column (4), and the two conductive hoops (5) are fixed by means of thread locking via two clamping bolts (6), and the two stabilizing seats (7) are respectively installed outside the two conductive hoops (5).

2. A retractable fuse according to claim 1, characterized in that: The distance support structure comprises: a distance support seat (8), a rotating seat (9) and a distance bolt (10); The distance support seat (8) is installed on the outside of the stable seat (7), the rotating seat (9) is installed on the lower wall of the fuse fixing seat (2), the distance bolt (10) is installed inside the distance support seat (8) through a threaded movement, and one end of the distance bolt (10) is fixed inside the rotating seat (9).

3. A retractable fuse according to claim 1, characterized in that: The conductive extension structure comprises: two conductive strips (11) and a conductive ring (12); The two conductive strips (11) are respectively mounted on the lower wall surface of the conductive hoop (5), and the conductive ring (12) is mounted on the lower wall surface of the two conductive strips (11).

4. A retractable fuse according to claim 3, characterized in that: A fuse mounting seat (13) is installed inside the conductive ring (12).

5. A retractable fuse according to claim 1, characterized in that: The two clamping bolts (6) are cross bolts.

6. A retractable fuse according to claim 2, characterized in that: The distance bolt (10) is an external hexagonal bolt.

7. A retractable fuse according to claim 1, characterized in that: The sealed space formed by the fuse tube (1) and the two fuse fixing seats (2) is filled with high temperature resistant particles.

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