Fuse

Abstract

The utility model discloses a fuse which comprises a fusion tube, an inner cap and an outer cap which are arranged at one end of the fusion tube, and an end cap arranged at the other end of the fusion tube, a first cavity and a second cavity are arranged in the end cap, the first cavity is used for accommodating one end part, far away from the inner cap, of the fusion tube, an ejector pin is arranged in the second cavity, and the ejector pin is used for accommodating the other end part of the fusion tube. And the first cavity is communicated with the second cavity. According to the fuse provided by the utility model, the outer diameter of the fusion tube is not limited by the ejector pin, and the fusion tube and the ejector pin are mutually independent, so that the outer diameter of the fusion tube can be set to be smaller, thereby meeting the requirements of more application scenes. In addition, the structure of the fuse is simplified, so that the fuse is more convenient to assemble.

Description

Technical Field

[0001] The utility model relates to a fuse. Background Art

[0002] A fuse is a current protector made based on the principle that when the current exceeds the specified value for a period of time, the fuse will melt with the heat generated by itself, thereby disconnecting the circuit. Fuses are widely used in high and low voltage power distribution systems and control systems as well as electrical equipment. As a short circuit and overcurrent protector, they are one of the most commonly used protective devices.

[0003] In the prior art, a Chinese utility model patent with the authorization announcement number CN210575810U and the patent name "A Small Fuse" discloses an improved fuse, which includes a fuse tube and an inner cover and an outer cover are provided at both ends of the fuse tube, and a recessed portion for placing an indicator is provided on one of the outer covers. By separating the signal wire from the fuse, interference between the two is avoided, and the indicator is protected. However, in this patent, an outer cover and an inner cover are provided at both ends of the fuse tube, which makes the assembly of the fuse inconvenient and increases the assembly time of the fuse; in addition, the indicator is located in the recessed portion provided on the outer cover, and the recessed portion gradually approaches the axial line of the fuse tube in the direction close to the center point of the fuse tube, which will result in a larger outer diameter of the fuse tube due to the limitation of the recessed portion, which reduces the application range of the fuse and cannot meet certain application scenarios that require small-sized (less than or equal to 5mm) fuses. Utility Model Content

[0004] In view of this, in order to overcome the defects of the prior art, the purpose of the utility model is to provide an improved fuse, which is more convenient to assemble and effectively expands the application range of the fuse.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A fuse includes a fusion tube, an inner cap and an outer cap arranged at one end of the fusion tube, and an end cap arranged at the other end of the fusion tube, wherein a first cavity and a second cavity are arranged inside the end cap, wherein the first cavity is used to accommodate an end of the fusion tube away from the inner cap, and a ejector pin is arranged inside the second cavity, and the first cavity is connected to the second cavity. In addition, the interior of the fusion tube is also filled with quartz sand to improve the breaking capacity of the fuse.

[0007] By providing only one end cap at one end of the melting tube, and opening a first cavity and a second cavity inside the end cap, and the second cavity being located outside the melting tube, and placing the ejector pin in the second cavity, the outer diameter of the melting tube will not be set too large due to the need to accommodate the ejector pin. Since the melting tube and the ejector pin are independent of each other, the outer diameter of the melting tube can be set smaller to meet the needs of more application scenarios.

[0008] According to some preferred implementation aspects of the utility model, it includes a fuse and a pin wire arranged inside the melting tube, one end of the fuse is located between the inner cap and the outer cap, and the other end of the fuse has a bending portion, and the bending portion is located outside one end of the melting tube close to the end cap.

[0009] According to some preferred implementation aspects of the utility model, the ejector pin includes an ejector pin body and a protrusion connected to each other, the second cavity includes a first portion and a second portion connected to each other, and the second cavity is located at an end of the end cap away from the inner cap.

[0010] According to some preferred implementation aspects of the present invention, the diameter of the first portion is smaller than the diameter of the second portion, the first portion is used to accommodate the ejector body, the second portion is used to accommodate a portion of the protrusion close to the ejector body, and the remaining portion of the protrusion is located outside the second cavity.

[0011] According to some preferred implementation aspects of the utility model, it also includes a thimble wire arranged inside the melting tube, one end of the thimble wire is fixedly connected to the outer cap, and the other end of the thimble wire is fixedly connected to an end of the thimble body away from the protrusion.

[0012] According to some preferred implementation aspects of the utility model, an elastic member is sleeved on the outer periphery of the ejector body.

[0013] According to some preferred implementation aspects of the utility model, one end of the elastic member abuts against the protruding portion, and the other end of the elastic member abuts against the top of the first portion. Before the fuse blows, the elastic member is in a compressed state, so that when the fuse is in a blown state, the current all passes through the ejector wire. After the ejector wire quickly blows, the compressed elastic member will pop outward, driving the protruding portion of the ejector to pop out of the second portion of the second cavity together, so as to prompt the staff.

[0014] According to some preferred implementation aspects of the utility model, the first cavity is extended inwardly from one end of the end cap close to the inner cap, and the diameter of the first cavity is equal to the outer diameter of the melting tube.

[0015] According to some preferred implementation aspects of the present invention, the outer diameter of the melting tube is less than or equal to 5 mm.

[0016] According to some preferred implementation aspects of the utility model, a through groove is further provided inside the end cap, and the through groove is used for allowing one end of the ejector wire away from the inner cap to pass through and then be connected to the ejector body.

[0017] Due to the adoption of the above technical solution, compared with the prior art, the utility model is beneficial in that the outer diameter of the fuse tube of the utility model is not limited by the ejector pin, and the fuse tube and the ejector pin are independent of each other, so that the outer diameter of the fuse tube can be set smaller, thereby meeting the needs of more application scenarios. In addition, the structure of the fuse is simplified, making it more convenient to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of the fuse in the embodiment of the utility model;

[0020] In the accompanying drawings, there are the melting tube 1, the inner cap 2, the outer cap 3, the end cap 4, the ejector pin 5, the ejector pin body 51, the protruding portion 52, the fuse wire 6, the bending portion 61, the ejector pin wire 7, and the elastic member 8. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solution in the embodiments of the present invention. Obviously, the described embodiments 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 creative work should fall within the scope of protection of the present invention.

[0022] like Figure 1 As shown, the fuse in this embodiment includes a melting tube 1, an inner cap 2 and an outer cap 3 arranged at one end of the melting tube 1, an end cap 4 arranged at the other end of the melting tube 1, a fuse 6 and an ejector wire 7 arranged inside the melting tube 1, quartz sand filled inside the melting tube 1, and an ejector 5 and an elastic member 8 arranged inside the end cap 4. The outer diameter of the melting tube 1 in this embodiment is less than or equal to 5 mm, and the melting tube 1 is a porcelain tube.

[0023] Furthermore, one end of the fuse 6 is located between the inner cap 2 and the outer cap 3 , and the other end of the fuse 6 has a bending portion 61 , which is located outside one end of the melting tube 1 close to the end cap 4 so that the bending plate hooks one end of the melting tube 1 .

[0024] Furthermore, the end cap 4 is provided with a through groove, a first cavity and a second cavity inside. The through groove connects the first cavity and the second cavity. The diameter of the through groove is small, and it is sufficient to ensure that the ejector wire 7 can pass through. The first cavity is opened by extending inward from the end of the end cap 4 close to the inner cap 2. The first cavity is used to accommodate the end of the melting tube 1 away from the inner cap 2, and the diameter of the first cavity is equal to the outer diameter of the melting tube 1, so as to ensure that the melting tube 1 remains tight when it is located in the first cavity. The second cavity is located at the end of the end cap 4 away from the inner cap 2. The second cavity includes a first part and a second part that are connected, wherein the first part is close to the first cavity, and the diameter of the first part is smaller than the diameter of the second part, and the length of the first part is greater than the length of the second part.

[0025] Specifically, the ejector pin 5 includes an ejector body 51 and a protrusion 52 connected to each other. The first part of the second cavity is used to accommodate the ejector body 51, and the second part is used to accommodate a portion of the protrusion 52 close to the ejector body 51, while the remaining portion of the protrusion 52 is located outside the second cavity. The length of the ejector wire 7 is greater than the length of the melting tube 1. One end of the ejector wire 7 located inside the melting tube 1 is fixedly connected to the outer cap 3, and the other end thereof passes through one end of the melting tube 1 and enters the through groove, and then passes through the through groove and is fixedly connected to one end of the ejector body 51 away from the protrusion 52.

[0026] The elastic member 8 is sleeved on the outer periphery of the ejector body 51. Before the fuse is blown, the elastic member 8 is in a compressed state, one end of the elastic member 8 is in contact with the protrusion 52, and the other end of the elastic member 8 is in contact with the top of the first part. When the fuse is in a blown state, the current passes through the ejector wire 7, so that the ejector wire 7 is quickly blown, and the compressed elastic member 8 pops outward, driving the protrusion 52 of the ejector 5 to pop out of the second part of the second cavity to prompt the staff. The elastic member 8 in this embodiment is preferably a spring.

[0027] The above embodiments obtained by the method of the utility model are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A fuse, It is characterized in that It includes a melting tube, an inner cap and an outer cap arranged at one end of the melting tube, and an end cap arranged at the other end of the melting tube. A first cavity and a second cavity are arranged inside the end cap. The first cavity is used to accommodate an end of the melting tube away from the inner cap. A ejector pin is arranged in the second cavity. The first cavity is connected to the second cavity.

2. The fuse according to claim 1, It is characterized in that It comprises a fuse and a thimble wire arranged inside the melting tube, one end of the fuse is located between the inner cap and the outer cap, the other end of the fuse has a bending part, and the bending part is located outside one end of the melting tube close to the end cap.

3. The fuse according to claim 1, It is characterized in that The ejector pin includes an ejector pin body and a protruding portion connected to each other, the second cavity includes a first portion and a second portion connected to each other, and the second cavity is located at an end of the end cap away from the inner cap.

4. The fuse according to claim 3, It is characterized in that The diameter of the first portion is smaller than that of the second portion. The first portion is used to accommodate the ejector body. The second portion is used to accommodate a portion of the protrusion close to the ejector body. The remaining portion of the protrusion is located outside the second cavity.

5. The fuse according to claim 3, It is characterized in that It also includes a thimble wire arranged inside the melting tube, one end of the thimble wire is fixedly connected to the outer cap, and the other end of the thimble wire is fixedly connected to an end of the thimble body away from the protruding portion.

6. The fuse according to claim 3, It is characterized in that An elastic piece is sleeved on the outer periphery of the ejector body.

7. The fuse according to claim 6, It is characterized in that One end of the elastic member abuts against the protruding portion, and the other end of the elastic member abuts against the top of the first portion.

8. The fuse according to claim 1, It is characterized in that The first cavity is extended inwardly from one end of the end cap close to the inner cap, and the diameter of the first cavity is equal to the outer diameter of the melting tube.

9. The fuse according to claim 8, It is characterized in that The outer diameter of the melting tube is less than or equal to 5 mm.

10. The fuse according to claim 3, It is characterized in that A through slot is also provided inside the end cap, and the through slot is used for allowing one end of the ejector wire away from the inner cap to pass through and then be connected to the ejector body.

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