Fuse for improving copper cap perforation phenomenon

Abstract

The utility model discloses a fuse capable of improving a copper cap perforation phenomenon, which comprises a ceramic tube body, inner cap housings, copper caps and a fuse link, the two ends of the ceramic tube body are provided with the inner cap housings used for high-temperature-resistant arc extinguishing, and the inner cap housings are made of high-temperature-resistant arc-resistant engineering plastics. The two ends of the ceramic tube body are sleeved with copper caps serving as end electrodes, the inner cap housing is located in the copper caps, a fuse link communicated with the copper caps at the two ends is installed in the ceramic tube body in a penetrating mode, the inner cap housing is in a revolving body shape, and the inner cap housing comprises an installation part inserted into the end face of the ceramic tube body and a blocking part used for blocking electric arcs. And an avoiding through hole for avoiding the fuse link is formed in the blocking part. Through the above mode, the fuse is stable in product performance, can effectively extinguish electric arc, improves the breaking capacity of the product, and greatly improves the copper cap perforation phenomenon in the breaking test of the fuse.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit protection, in particular to a fuse capable of improving the copper cap perforation phenomenon. Background Art

[0002] Conventional internal welding fuses are composed of a ceramic tube, a fuse element, and a metal copper cap. When testing the breaking capacity, the fuse element instantly melts into liquid metal particles and metal particles under the influence of high voltage and high current. The high voltage generated in the closed cavity causes these charged metal particles to impact the two ends of the product, causing perforation of the copper caps at both ends.

[0003] The Chinese patent with patent number CN202223552571.5 discloses a fuse, in which a metal copper cap with a hole is added between the copper cap and the ceramic tube. The purpose is to increase the welding area to facilitate the welding process in production. Although a metal inner cap is added and the center thickness of the outer cap is thickened, this design significantly increases the thickness of the copper cap, greatly increasing the cost. In addition, the double copper cap will still have copper cap perforation in actual applications. This is because most of the high-temperature and high-pressure charged particles generated during the breaking test are in direct contact with the metal copper cap.

[0004] Based on the above defects and shortcomings, it is necessary to improve the existing technology and design a fuse that improves the copper cap perforation phenomenon. Utility Model Content

[0005] The main technical problem solved by the utility model is to provide a fuse which improves the copper cap perforation phenomenon, thereby solving the copper cap perforation phenomenon in the disconnection test of the fuse.

[0006] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a fuse for improving the copper cap perforation phenomenon, the fuse for improving the copper cap perforation phenomenon comprises a ceramic tube body, an inner cap cover, a copper cap and a fuse, inner cap covers for resisting high temperature arc extinguishing are installed at both ends of the ceramic tube body, the inner cap cover adopts high temperature arc resistant engineering plastic, copper caps as end electrodes are sleeved at both ends of the ceramic tube body, the inner cap cover is located inside the copper cap, a fuse connected with the copper caps at both ends is installed in the ceramic tube body, the inner cap cover is in the shape of a rotating body, the inner cap cover comprises a mounting portion inserted into the end face of the ceramic tube body and a blocking portion for blocking the arc, and an avoidance through hole for avoiding the fuse is opened on the blocking portion.

[0007] Preferably, both end surfaces of the ceramic tube body are provided with annular grooves for mounting the inner cap cover, and the mounting portion of the inner cap cover is inserted into the annular grooves.

[0008] Preferably, the accommodation space formed by the inner wall of the copper cap, the ceramic tube body and the inner cap cover is filled with welding material, and the welding material conducts the fuse and the copper cap.

[0009] Preferably, the soldering material is tin.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] A ceramic tube with annular grooves at both ends is designed, and an engineering plastic inner cap cover that is resistant to high temperature and arc is selected to assemble it. The assembled combination has a stable structure and is easy to assemble. Most of the high-temperature and high-pressure charged particles generated by this structural fuse during the breaking test can be blocked by the plastic inner cap cover. At this time, the impact of the high-temperature arc on the copper cap serving as the end electrode will be greatly weakened. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The figure is a schematic diagram of the expanded structure of a fuse that improves the copper cap perforation phenomenon.

[0013] Figure 2 The cross-sectional view of a fuse with improved copper cap perforation phenomenon.

[0014] Among them, 1. Ceramic tube body, 10. Annular groove, 2. Inner cap cover, 21. Mounting part, 22. Blocking part, 23. Avoidance through hole, 3. Copper cap, 4. Fuse 4. DETAILED DESCRIPTION

[0015] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0016] See also Figure 1 and Figure 2 , the utility model embodiment includes:

[0017] A fuse for improving the copper cap perforation phenomenon, the fuse for improving the copper cap perforation phenomenon comprises a ceramic tube body 1, an inner cap cover shell 2, a copper cap 3 and a fuse 4, the inner cap cover shell 2 for resisting high temperature arc extinguishing is installed at both ends of the ceramic tube body 1 to solve the copper cap perforation problem in the breaking test, the inner cap cover shell 2 is made of high temperature resistant and arc resistant engineering plastic, the copper caps 3 as end electrodes are sleeved at both ends of the ceramic tube body 1, the inner cap cover shell 2 is located inside the copper cap 3, the fuse 4 connected to the copper caps 3 at both ends is installed in the ceramic tube body 1, the inner cap cover shell 2 is in the shape of a rotating body, the inner cap cover shell 2 comprises a mounting portion 21 inserted into the end face of the ceramic tube body 1 and a blocking portion 22 for blocking the arc, and the blocking portion 22 is provided with an avoidance through hole 23 for avoiding the fuse 4.

[0018] The two end surfaces of the ceramic tube body 1 are provided with annular grooves 10 for installing the inner cap cover 2, and the mounting portion 21 of the inner cap cover 2 is inserted into the annular grooves 10. The assembly structure of the ceramic tube body 1 and the inner cap cover 2 is stable and can be regarded as an integrated structure after assembly. In addition, it is convenient to assemble. If the inner cap directly contacts the end face of the ceramic tube, it is easy to fall off during the assembly process.

[0019] The accommodating space formed by the inner wall of the copper cap 3, the ceramic tube body 1 and the inner cap cover 2 is filled with welding material, and the welding material conducts the fuse 4 and the copper cap 3. The welding material is tin.

[0020] The utility model discloses a fuse which improves the copper cap perforation phenomenon. The product has stable performance, can effectively extinguish arcs, improves the product breaking capacity, and greatly improves the copper cap perforation phenomenon of the fuse in the breaking test.

[0021] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fuse for improving the copper cap perforation phenomenon, characterized in that: The invention comprises a ceramic tube body (1), an inner cap cover (2), a copper cap (3) and a fuse (4); the inner cap cover (2) for resisting high temperature arc extinguishing is installed at both ends of the ceramic tube body (1); the inner cap cover (2) is made of high temperature resistant and arc resistant engineering plastic; the copper caps (3) as end electrodes are sleeved at both ends of the ceramic tube body (1); the inner cap cover (2) is located inside the copper caps (3); the ceramic tube body (1) is provided with a fuse (4) which is conductive with the copper caps (3) at both ends; the inner cap cover (2) is in the shape of a rotating body; the inner cap cover (2) comprises a mounting portion (21) inserted into the end surface of the ceramic tube body (1) and a blocking portion (22) for blocking the arc; the blocking portion (22) is provided with an avoidance through hole (23) for avoiding the fuse (4).

2. A fuse for improving copper cap perforation according to claim 1, characterized in that: Both end surfaces of the ceramic tube body (1) are provided with annular grooves (10) for mounting the inner cap cover shell (2), and the mounting portion (21) of the inner cap cover shell (2) is inserted into the annular grooves (10).

3. A fuse for improving copper cap perforation according to claim 1, characterized in that: The accommodating space formed by the inner wall of the copper cap (3), the ceramic tube body (1) and the inner cap cover (2) is filled with welding material, and the welding material conducts the fuse (4) and the copper cap (3).

4. A fuse for improving copper cap perforation according to claim 3, characterized in that: The welding material is tin.

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