CN221841792U - Fusible element for fuse and fuse having the same - Google Patents

Abstract

The utility model relates to a fusible component for a fuse and a fuse having the same. A fusible component for a fuse comprises: a melt, which comprises a plurality of narrow diameter sections spaced apart in the length direction and a bending section located between adjacent narrow diameter sections among the plurality of narrow diameter sections, the plurality of narrow diameter sections are located at the same horizontal position, a section of the bending section adjacent to the narrow diameter section is constructed as an attachment section extending obliquely upward away from the adjacent narrow diameter section, and the upper surface of the attachment section is designed to be a flat surface; a metallurgical effect layer, which is made of a material having a lower melting point than the melt, the metallurgical effect layer is attached to at least the upper surface of the attachment section closest to the center of the melt, so that the metallurgical effect layer can flow to the adjacent narrow diameter section by gravity in a molten state.

Description

Fusible element for fuse and fuse having the same

Technical Field

The utility model relates to the technical field of circuit protection devices for electric power or electric vehicles, in particular to a fusible component for a fuse and a fuse having the same.

Background Art

Fuses, such as fast-acting fuses, are widely used as current protectors in high and low voltage power distribution systems and control systems as well as electrical equipment, such as semiconductor rectifier components or rectifier devices, due to their advantages of fast disconnection. When a fault occurs in the protected circuit, the fault current passes through the fuse, causing the fusible element in the fuse to heat up and melt after a period of time, thereby protecting the protected circuit connected in series with the fuse.

A fuse usually has a groove pressed on the fusible part, and a metallurgical effect material that produces a metallurgical effect with the fusible part is placed in the groove, so that when a small overload current passes through the protected circuit, the molten metallurgical effect material can flow out of the groove to the narrow diameter of the fusible part, and the metallurgical material produces a metallurgical effect with the material at the narrow diameter of the fusible part, thereby melting the narrow diameter of the fusible part. However, it is difficult for the molten material in the groove to flow to the narrow diameter of the fusible part, and the melting time will be prolonged, which will lead to a defect of low reliability when interrupting the overload current.

Therefore, there is a need in the art for fusible components and fuses with higher reliability.

Utility Model Content

The utility model aims to provide a fusible component which can at least solve part of the above problems.

The utility model also aims to provide a fuse using the improved fusible element.

According to one aspect of the utility model, a fusible component for a fuse is provided, the fusible component comprising: a melt, comprising a plurality of narrow diameter sections spaced apart in a length direction and a bending section between adjacent narrow diameter sections among the plurality of narrow diameter sections, the plurality of narrow diameter sections being located at the same horizontal position, a section of the bending section adjacent to the narrow diameter section being constructed as an attachment section extending obliquely upward away from the adjacent narrow diameter section, and an upper surface of the attachment section being designed as a flat surface; a metallurgical effect layer made of a material having a lower melting point than the melt, the metallurgical effect layer being attached to at least an upper surface of the attachment section closest to the center of the melt, so that the metallurgical effect layer can flow to the adjacent narrow diameter section by gravity in a molten state.

Compared with the prior art, the fusible part in the utility model can accelerate the fusing of the narrow diameter section of the melt by arranging the melt and the metallurgical effect layer on the melt. The metallurgical effect layer is at a certain distance from the narrow diameter section in the length direction of the melt, which allows the melt to not be blown within a certain period of time, thereby allowing the protected circuit to operate for a desired time under overload current. The metallurgical effect layer is arranged on the upper surface of the attachment section of the bending section, the attachment section is inclined upward relative to the narrow diameter section and its upper surface is designed to be a flat surface, which allows the metallurgical effect layer to flow smoothly to the narrow diameter section along the attachment section by gravity after melting, thereby accelerating the fusing of the narrow diameter section under overload fault.

Preferably, the metallurgical effect layer is arranged on the upper surface of the attachment section adjacent to the lower side edge of the attachment section.

Preferably, the metallurgical effect layer is configured in an elongated shape extending in a width direction of the melt and extends over the entire width of the attachment section.

Preferably, the plurality of narrow diameter sections are evenly spaced along the length direction of the melt, and the number of the plurality of narrow diameter sections is an odd number, so that the central narrow diameter section among the plurality of narrow diameter sections is arranged at the center of the melt.

Preferably, the bending section is composed of two attachment sections, and the two attachment sections extend obliquely upward from narrow diameter sections on both sides of the bending section in the length direction until they are connected to each other.

Preferably, the bending section consists of two attachment sections and a transition section, the two attachment sections extend obliquely upward from narrow diameter sections on both sides of the length direction of the bending section respectively, and the transition section is used to bridge the two attachment sections.

Preferably, the transition section is configured in a straight shape or a wavy shape extending along the length direction of the melt.

Preferably, each narrow diameter section includes a variable cross-section section and a connecting section located on both sides of the variable cross-section section along the length direction of the melt, wherein the dimensions of the connecting sections of the multiple narrow diameter sections along the length direction of the melt are different from each other, and the dimensions of the bending section along the length direction of the melt are designed so that the spacing between the variable cross-section sections of adjacent narrow diameter sections among the multiple narrow diameter sections is equal.

Preferably, there is a smooth transition between the bending section and the adjacent narrow diameter section.

According to another aspect of the present invention, a fuse is provided, and the fuse includes the fusible element according to the above.

Some of the other features and advantages of the present invention will be apparent to those skilled in the art after reading this application, and the other parts will be described in the following specific embodiments in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The embodiments of the present invention are described in detail below with reference to the accompanying drawings, wherein:

FIG1 is a perspective view of a fuse according to the present invention;

FIG2 is a cross-sectional view of a fuse according to the present invention;

FIG3 is a perspective view of a fusible element for a fuse according to the utility model;

FIG. 4 is a top view of a fusible element for a fuse according to the present invention.

Description of reference numerals:

100-fuse; 10-fusible part; 11-melt; 111-narrow diameter section; 111a-variable cross-section section; 111b-connecting section; 112-bending section; 112a-attaching section; 12-metallurgical effect layer; 13-arc extinguishing glue; 20-melting tube; 30-end cap 40-connecting terminal.

DETAILED DESCRIPTION

Now, with reference to the accompanying drawings, the schematic scheme of the fuse and its fusible parts disclosed in the utility model is described in detail. Although the drawings are provided to present some embodiments of the utility model, the drawings do not have to be drawn according to the dimensions of the specific embodiments, and certain features may be enlarged, removed or partially cut to better illustrate and explain the disclosure of the utility model. Some components in the drawings can be adjusted in position according to actual needs without affecting the technical effect. The phrase "in the drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

Certain directional terms used to describe the drawings below, such as "inside", "outside", "above", "below" and other directional terms, will be understood to have their normal meanings and refer to those directions involved when the drawings are normally viewed. Unless otherwise specified, the directional terms described in this specification are basically in accordance with the conventional directions understood by those skilled in the art.

The terms "first", "first", "second", "second" and the like used in the present invention do not indicate any order, quantity or importance, but are used to distinguish one component from other components.

The terms "joining", "connection" and the like as used in the present invention include both that two components are indirectly connected together by means of an intermediate layer such as an adhesive, a welding agent, etc. or an intermediate piece such as a connector, a transition piece, etc., and that two components are directly connected together without the aid of any intermediate layer such as an adhesive, a welding agent, etc. or an intermediate piece such as a connector, a transition piece, etc.

1 to 4 show the fuse 100 and the fusible element 10 of the present invention by way of example. The fusible element 10 in this example can not only break the short-circuit fault current, but also shorten the fusing time of breaking the overload fault current, thereby improving the reliability of the fusible element 10 and the fuse 100 to which it is applied. As shown in the figure, the fuse 100 may include the fusible element 10, the fusion tube 20, a pair of end caps 30 and a pair of terminal blocks 40.

Specifically, the fuse tube 20 can be made of insulating materials, such as plastic or ceramic. The fuse tube 20 can be generally configured as a cylindrical structure with an axially extending mounting cavity, and the mounting cavity in the fuse tube 20 is closed by end caps 30 at both ends of the axial direction. A pair of connecting terminals are respectively connected to the end caps 30 at both ends of the fuse tube 20, and are connected to the fusible element 10 in the fuse tube 20 through the corresponding end caps 30, so that the fusible element 10 is connected in series to the protected circuit. It can be understood that the components of the fuse 100 other than the fusible element 10 are not the focus of the discussion of the present utility model, so they are not repeated here.

As shown in FIGS. 2 to 4 , the fusible part 10 may include a melt 11 and a metallurgical effect layer 12 , wherein the melt 11 may be made of a conductive material such as copper, and the metallurgical effect layer 12 may be made of a conductive material having a lower melting point than the melt 11 , such as tin having a lower melting point than copper.

In the illustrated embodiment, the melt 11 includes five narrow diameter sections 111 and four bending sections 112. The five narrow diameter sections 111 are evenly spaced along the length direction of the melt 11, and the four bending sections 112 are respectively arranged between adjacent narrow diameter sections 111 in the five narrow diameter sections 111. It can be seen that the length direction of the melt 11 described here is the same direction as the axial direction of the melt tube 20, which is specifically illustrated as the left-right direction of the page where FIG. 2 is located. In addition, the width direction of the melt 11 described later can be specifically illustrated as the up-down direction of the page where FIG. 4 is located.

The five narrow diameter sections 111 are symmetrically arranged about the center of the melt 11 in the length direction of the melt 11, so that the narrow diameter section 111 in the middle is located at the center of the melt 11. Therefore, the narrow diameter section 111 in the middle is farther from the axial ends of the melt 11 than the other narrow diameter sections 111 in heat dissipation distance, and when an overload fault current passes through, the narrow diameter section 111 in the middle has a higher temperature rise than the other narrow diameter sections 111 and will be fused earlier.

All the narrow diameter sections 111 are located at the same horizontal position, and the bending section 112 can be made by punching the melt 11 along the vertical direction with a bending tool. Among them, the bending section 112 can be composed of a plurality of sections, and the section of the bending section 112 adjacent to the narrow diameter section 111 is configured as an attachment section 112a extending obliquely upward away from the adjacent narrow diameter section 111, and the upper surface of the attachment section 112a is a flat surface. In the illustrated embodiment, the bending section can be composed of two sections, and both of the sections are configured as attachment sections 112a, and the two attachment sections 112a extend obliquely upward from the narrow diameter sections 111 on both sides of the length direction of the bending section 112, respectively, until the two attachment sections are connected to each other. It can be seen that the upper surfaces of the attachment sections 112a face the adjacent narrow diameter sections 111.

The central narrow diameter section 111 among the five narrow diameter sections 111 is located at the center of the melt 11, and the bending sections 112 on both sides of the central narrow diameter section 111 are the two bending sections 112 closest to the center of the melt 11, so the attachment sections 112a adjacent to the central narrow diameter section 111 of the two bending sections 112 are both the attachment sections 112a closest to the center of the melt 11. The metallurgical effect layer 12 may be arranged on the upper surface of at least one attachment section 112a closest to the center of the melt 11, so that the metallurgical effect layer 12 faces the central narrow diameter section 111. In an embodiment not shown, the metallurgical effect layer 12 may be arranged on the two attachment sections 112a closest to the center of the melt 11. In an embodiment not shown, the metallurgical effect layer 12 may also be arranged on the attachment sections 112a of all the bending sections 112.

When the metallurgical material is arranged on the melt 11, the attachment section 112a of the bending section 112 can be kept horizontal first and the upper surface of the attachment section 112a can be directed upward, and then the raw material of the metallurgical effect layer is heated and dripped onto the upper surface of the attachment section 112a of the bending section 112, and after the raw material of the metallurgical effect layer is cooled on the attachment section 112a of the bending section 112, the metallurgical material is attached to the melt 11. It can be seen that this arrangement will not damage the flat surface of the attachment section 112a of the melt 11, so no recessed portion along the thickness direction is formed on the bending section 112, thereby not hindering the flow of the metallurgical effect layer 12 in the molten state.

In this way, when the fuse 100 of the utility model passes through an overload fault current, the narrow diameter section 111 heats up due to its large resistance, and the metallurgical effect layer melts first due to its low melting point. The molten metallurgical effect layer flows toward the central narrow diameter section 111 along the inclined upper surface of the attachment section 112a under the action of gravity and under the guidance of the central narrow diameter section 111 with a higher temperature rise, and the metallurgical material and the central narrow diameter section 111 undergo a metallurgical effect, thereby accelerating the fusing of the central narrow diameter section 111. Among them, the distance between the metallurgical effect layer and the central narrow diameter section 111 allows the metallurgical effect layer in a molten state to take a certain amount of time to flow to the central narrow diameter section 111 and react with the central narrow diameter section 111, which allows the melt 11 to not be blown for a certain period of time under an overload fault current.

In an embodiment not shown, the number of the narrow diameter sections 111 may be configured as an even number. The two central narrow diameter sections 111 are located on both sides of the center of the melt 11, and the bending section 112 located between the two central narrow diameter sections 111 is located at the center of the melt 11. Therefore, the two attachment sections 112a of the bending section 112 located at the center of the melt 11 are the attachment sections 112a closest to the center of the melt 11. Considering that the temperature rise of the two central narrow diameter sections 111 is higher than that of other narrow diameter sections 111, the metallurgical effect layer 12 may be arranged on the two attachment sections 112a of the bending section 112 located at the center of the melt 11, so that the two central narrow diameter sections 111 can be quickly melted.

Optionally, in the illustrated embodiment, the metallurgical effect layer 12 is arranged adjacent to the lower edge of the attachment section 112a, so that the metallurgical effect layer 12 is as close as possible to the adjacent narrow diameter section 111, which can facilitate the metallurgical effect layer 12 to flow to the adjacent narrow diameter section 111 in a molten state. In an embodiment not shown, the metallurgical effect layer 12 can also be arranged adjacent to the upper edge of the attachment section 112a. In an embodiment not shown, the metallurgical effect layer 12 can be arranged in the middle of the attachment section 112a. In an embodiment not shown, the metallurgical effect layer 12 can cover the entire upper surface of the attachment section 112a.

Alternatively, in the illustrated embodiment, the melt 11 may be in an elongated shape extending in the width direction of the melt 11. The narrow diameter section 111 of the melt 11 extends in the entire width direction of the melt 11, so the metallurgical effect layer may also extend in the entire width direction of the melt 11 accordingly, so that when an overload fault current passes through, the metallurgical effect layer 12 in a molten state may flow evenly toward the narrow diameter section 111.

Alternatively, in an embodiment not shown, the bending section 112 may be composed of three sections connected in sequence along the length direction of the melt 11, wherein the sections on both sides may be designed as attachment sections 112a extending obliquely upward from the adjacent narrow diameter section 111, and the middle section may be designed as a transition section bridging the two attachment sections 112a. Exemplarily, the transition section may be designed as a straight shape extending along the length direction of the melt 11, and the two attachment sections 112a and the transition section may cooperate to form a trapezoid or rectangle according to the different angles between the attachment sections 112a and the narrow diameter section 111. Alternatively, the transition section may be designed as a wave shape extending along the length direction of the melt 11, which may be used to alleviate the impact force on the melt 11 when it is broken.

Optionally, in the illustrated embodiment, the narrow diameter section 111 may include a variable cross-section section 111a and connecting sections 111b located on both sides of the variable cross-section section 111a, and the variable cross-section section 111a may be formed by arranging a plurality of punching holes at intervals along the width direction of the melt 11. The five narrow diameter sections 111 illustrated are constructed in the same manner, so the variable cross-section sections 111a and the connecting sections 111b of the five narrow diameter sections 111 are all constructed in the same manner, and the four bending sections 112 are also constructed in the same manner.

In an embodiment not shown, the variable cross-section sections 111a of the multiple narrow diameter sections 111 are constructed in the same manner to ensure that the minimum cross-sectional area and the total cross-sectional area of each variable cross-sectional section 111a are equal, but the connecting sections 111b of the multiple narrow diameter sections 111 may have different sizes along the length direction of the melt 11, which means that the distance between each narrow diameter section 111 and the adjacent bending section 112 may be selected according to actual needs. It should be noted that when the connecting sections 111b of the multiple narrow diameter sections 111 have different sizes along the length direction, the sizes of the multiple bending sections 112 along the length direction may be changed accordingly to make the distances between the variable cross-section sections 111a of any adjacent narrow diameter sections 111 of the multiple narrow diameter sections 111 equal.

Optionally, in the illustrated embodiment, there may be a smooth transition between the narrow diameter section 111 and the bent section 112 , and there may also be a smooth transition between the two attachment sections 112 a of the bent section 112 , so as to avoid affecting the electrical performance of the fusible element 10 .

Optionally, the fusible component 10 may also include two arc-extinguishing glues 13, as shown in Figure 4, wherein one arc-extinguishing glue 13 is arranged on the left connecting section 111b of the leftmost narrow diameter section 111, and the other arc-extinguishing glue 13 is arranged on the right connecting section 111b of the rightmost narrow diameter section 111, so that when the fault current passes through the fuse 11 and causes the variable cross-section sections 111a of multiple narrow diameter sections 111 to melt, the arc-extinguishing glue 13 on both sides of the narrow diameter section 111 can be vaporized, thereby preventing the fuse 11 from accidentally connecting due to an unexpected electric arc when it melts.

It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by any technician in the field without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims (10)

1. A fusible element (10) for a fuse (100), characterized in that the fusible element (10) comprises: A melt (11), comprising a plurality of narrow diameter sections (111) spaced apart in a length direction and a bending section (112) located between adjacent narrow diameter sections (111) among the plurality of narrow diameter sections (111), wherein the plurality of narrow diameter sections (111) are located at the same horizontal position, a section of the bending section (112) adjacent to the narrow diameter section (111) is configured as an attachment section (112a) extending obliquely upward away from the adjacent narrow diameter section (111), and an upper surface of the attachment section (112a) is designed to be a flat surface; A metallurgical effect layer (12) is made of a material having a lower melting point than the melt (11), and the metallurgical effect layer (12) is attached to at least the upper surface of an attachment section (112a) closest to the center of the melt (11), so that the metallurgical effect layer (12) can flow to the adjacent narrow diameter section (111) by gravity in a molten state. 2. The fusible element (10) for a fuse (100) according to claim 1, characterized in that the metallurgical effect layer (12) is arranged on the upper surface of the attachment section (112a) adjacent to the lower side edge of the attachment section (112a). 3. The fusible element (10) for a fuse (100) according to claim 1 is characterized in that the metallurgical effect layer (12) is constructed in an elongated shape extending in the width direction of the melt (11) and extends over the entire width of the attachment section (112a). 4. The fusible element (10) for a fuse (100) according to claim 1 is characterized in that the multiple narrow diameter sections (111) are evenly spaced along the length direction of the fuse (11), and the number of the multiple narrow diameter sections (111) is constructed as an odd number so that the central narrow diameter section (111) among the multiple narrow diameter sections (111) is arranged at the center position of the fuse (11). 5. The fusible element (10) for a fuse (100) according to claim 1 is characterized in that the bending section (112) is composed of two attachment sections (112a), and the two attachment sections (112a) extend obliquely upward from the narrow diameter sections (111) on both sides of the length direction of the bending section (112) until they are connected to each other. 6. The fusible element (10) for a fuse (100) according to claim 1 is characterized in that the bending section (112) is composed of two attachment sections (112a) and a transition section, and the two attachment sections (112a) extend obliquely upward from the narrow diameter sections (111) on both sides of the length direction of the bending section (112), respectively, and the transition section is used to bridge the two attachment sections (112a). 7. The fusible element (10) for a fuse (100) according to claim 6, characterized in that the transition section is constructed in a straight shape or a wavy shape extending along the length direction of the fuse (11). 8. The fusible element (10) for a fuse (100) according to claim 1 is characterized in that each narrow diameter section (111) includes a variable cross-section section (111a) and a connecting section (111b) located on both sides of the variable cross-section section (111a) along the length direction of the fuse (11), wherein the dimensions of the connecting sections (111b) of the multiple narrow diameter sections (111) along the length direction of the fuse (11) are different from each other, and the dimensions of the bending section (112) along the length direction of the fuse (11) are designed so that the spacing between the variable cross-section sections (111a) of adjacent narrow diameter sections (111) among the multiple narrow diameter sections (111) is equal. 9. The fusible element (10) for a fuse (100) according to claim 1, characterized in that there is a smooth transition between the bent section (112) and the adjacent narrow diameter section (111). 10. A fuse (100), characterized in that the fuse (100) comprises a fusible element (10) according to any one of claims 1 to 9.