CN113782401A

CN113782401A - Hybrid electrode temperature fuse

Info

Publication number: CN113782401A
Application number: CN202111078727.8A
Authority: CN
Inventors: 汪洋; 王维; 丛艳丽
Original assignee: Sophie Jiangsu Electronic Technology Co ltd
Current assignee: Sophie Jiangsu Electronic Technology Co ltd
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2021-12-10

Abstract

The mixed electrode temperature fuse comprises a shell, a fluxing agent element, a fusible alloy element, a first electrode, a first end cover, a second electrode and a second end cover, wherein the shell is coated on the fluxing agent element; the second electrode comprises a flaky base body, an end cover mounting groove, a connecting hole and a pin, wherein the end cover mounting groove is formed in the middle of the flaky base body, the connecting hole penetrates through the flaky base body, the pin is formed by extending the edge of the flaky base body, the second electrode is mounted on the shell, the fusible alloy element is fixed with the second electrode, and the second end cover is mounted in the end cover mounting groove; according to the invention, the flaky second electrode is arranged, and the second electrode is in surface contact with the fusible alloy element, so that the contact area of the second electrode and the fusible alloy element is increased.

Description

Hybrid electrode temperature fuse

Technical Field

The invention relates to a fuse, in particular to a mixed electrode temperature fuse.

Background

A thermal fuse (thermal fuse) is a non-resettable circuit thermal protection device incorporating a thermal element (fusible alloy element formed into a specified size, also called a temperature sensing body) which, when exposed to temperatures exceeding a designed temperature (i.e. the rated operating temperature of the thermal fuse: the temperature at which the electrical state of the thermal fuse changes, see in particular the rated operating temperature definition of the national standard GB 9816-20093.10) for a sufficient time will open the circuit to avoid the risk of fire or the like due to over-temperature of other devices, wherein the thermal fuse is used in series with the protected element.

The general temperature fuse comprises an electrode, a shell, a fluxing agent element and a fusible alloy element, wherein the shell wraps the fusible alloy element coated with the fluxing agent element, the electrode is connected with the fusible alloy element, and then the electrode is electrically and thermally connected with an external circuit. Wherein the fusible alloy element and the electrode are brazed to form a unitary body by the action of a flux. When the temperature of the external circuit is higher than the rated temperature of the temperature fuse, the fusible alloy element is rapidly disconnected under the promotion of the fluxing medium element and shrinks to the two ends of the electrode to realize the disconnection, so that the protected external circuit is cut off.

The current structure of the temperature fuse mainly comprises an axial type and a radial type, so that a user plug board can be conveniently installed and used, and electrodes of the temperature fuse are all round linear electrodes (such as tinned copper wires). However, because the existing temperature fuse structure has limitations, if the temperature fuse only senses the external temperature through the temperature fuse electrode, and the electrode is a round copper wire, the contact between the temperature fuse and the protected element is a line contact, the heat transfer surface is small, and the heat transfer is slow; if the temperature fuse senses the external temperature through the shell of the temperature fuse, the shell is made of plastic mainly, so that the heat conducting performance of the temperature fuse is poor, and certain lag exists when the heat of a protected device is transferred to the temperature fuse.

Disclosure of Invention

It is a primary object of the present invention to overcome the above disadvantages and drawbacks of the prior art and to provide a hybrid electrode temperature fuse.

A mixed electrode temperature fuse comprises a shell, a fusing assistant element, a fusible alloy element, a first electrode, a first end cover, a second electrode and a second end cover, wherein the shell is coated on the fusing assistant element; the second electrode includes slice base member, end cover mounting groove, connecting hole and pin, the end cover mounting groove is seted up at slice base member middle part, the connecting hole passes end cover mounting groove bottom link up the slice base member, the pin by slice base member edge extends and forms, the second electrode is installed the other end of shell, the other pot head of fusible alloy component is established in the connecting hole with the second electrode is fixed, the second end cover is installed in the end cover mounting groove.

In one embodiment, the first electrode is a wire electrode, the second electrode is a circular sheet electrode, the second electrode is perpendicular to the fusible alloy element, and the diameter of the second electrode is the same as the diameter of the housing.

In one embodiment, the sheet-shaped base body comprises a substrate and an embedded part which is convexly arranged from the center of the substrate, and the connecting hole is arranged in the center of the embedded part; the shell is in a hollow cylindrical shape, an embedded groove is formed in the middle of one end of the fusing assistant element, and a fixing hole is formed in the bottom of the embedded groove; the substrate is abutted to the end face of the shell, the embedded part is inserted into the embedded groove, and the fusible alloy element is inserted into the fixing hole.

In one embodiment, the diameter of the first electrode is larger than the diameter of the fixation hole.

In one embodiment, a limiting block is arranged at the left end of the fusible alloy element, the fusible alloy element penetrates through the connecting hole, the limiting block abuts against the bottom of the end cover mounting groove, and the second end cover abuts against the limiting block.

In one embodiment, a connecting part is arranged at the left end of the first electrode, a through hole is formed in the middle of the first end cover, and the cross section area of the connecting part is larger than that of the through hole; the fusible alloy element is coated on the connecting part.

In one embodiment, the first electrode and the fusible alloy element are fixed by welding.

In one embodiment, the material of the first electrode and the second electrode is one or a combination of copper, silver, nickel and tin.

In one embodiment, the housing is made of one or a combination of plastic, ceramic and ceramic glass, and the first end cap and the second end cap are made of epoxy resin or silica gel.

The mixed electrode temperature fuse has the beneficial effects that: through the second electrode with the sheet shape, the second electrode is in surface contact with the fusible alloy element, and the contact area of the second electrode and the fusible alloy element is increased. The heat transfer speed is high, the fusible alloy element can be fused rapidly under the action of the fluxing agent element, and the protected device is guaranteed not to be damaged.

Drawings

FIG. 1 is a schematic structural diagram of a hybrid electrode temperature fuse according to the present invention;

FIG. 2 is an exploded view of the hybrid electrode temperature fuse of FIG. 1;

FIG. 3 is a schematic diagram of a portion of the hybrid electrode temperature fuse of FIG. 2;

FIG. 4 is a cross-sectional view of the hybrid electrode temperature fuse of FIG. 1 in accordance with the present invention;

FIG. 5 is a cross-sectional view of another embodiment of a hybrid electrode temperature fuse of the present invention.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, the present invention provides a hybrid electrode temperature fuse, which includes a housing 1, a fuse aid element 2, a fusible alloy element 3, a first electrode 4, a first end cap 5, a second electrode 6, and a second end cap 7. The casing 1 is a non-conductive layer, and is made of one or two or three of plastic, ceramic and ceramic glass, the casing 1 is wrapped on the fuse aid element 2, in this embodiment, the casing 1 is a hollow cylinder, and the shape of the casing can take other shapes, and is not limited to a cylinder. The fusing assistant element 2 can be injected into the shell 1 in a liquid form and cooled into a solid, specifically, after the fusible alloy element 3 is welded and fixed with the first electrode 4 and the second electrode 6, the liquid fusing assistant element 2 is injected, and finally, the sealing is carried out through the first end cover 5 and the second end cover 7; furthermore, it may be inserted into the housing 1 in a solid state manner.

The fusing assistant element 2 is coated on the fusible alloy element 3, wherein the fusing assistant element 2 has a fusing assistant effect on the fusible alloy element 3, so that the fusible alloy element 3 is contracted into a round ball to cut off a conductive loop, and an overheating protection function is achieved on a protected device. The fusible alloy element 3 is made of an alloy or a mixture of lead, antimony and tin.

More specifically, referring to fig. 2 and 4, the first electrode 4 is a linear electrode, a through hole 51 is formed in the middle of the first end cap 5, the first electrode 4 passes through the through hole 51 and is connected with one end of the fusible alloy element 3, and the first end cap 5 abuts against the housing 1 and the fluxing medium element 2. Wherein the first electrode 4 and the fusible alloy element 3 are fixed by welding. It can be understood that, in the assembly process, the first electrode 4 is firstly welded to one end of the fusible alloy element 3 through the first end cap 5, and then the first end cap 5 is fixed to the housing 1, and the fixing manner of the first end cap 5 and the housing 1 may be fixed by screw fixation, silicone sealing or other manners, and those skilled in the art can perform the installation according to actual situations.

More specifically, since the first electrode 4 is in line contact with the fusible alloy element 3, in order to ensure a sufficient contact area, increase a heat transfer surface, and increase a heat transfer rate, the diameter of the first electrode 4 is larger than that of the fusible alloy element 3.

More specifically, referring to fig. 2, 3 and 4, the second electrode 6 is a circular sheet electrode, and the diameter of the second electrode 6 is the same as the diameter of the housing 1; the shape of the second electrode 6 may be other than circular, depending on the shape of the housing 1, mainly in that the second electrode 6 is in the form of a plate for increasing the contact area with the fusible alloy element 3. Second electrode 6 includes slice base member 61, end cover mounting groove 62, connecting hole 63 and pin 64, end cover mounting groove 62 is seted up at slice base member 61 middle part, connecting hole 63 passes end cover mounting groove 62 bottom link up slice base member 61, pin 64 by slice base member 61 edge extension forms, second electrode 6 installs the other end of shell 1, the other end cover of fusible alloy component 3 is established in the connecting hole 63 with second electrode 6 is fixed, second end cover 7 is installed in end cover mounting groove 62. It is to be understood that the sheet-like base 61 of the second electrode 6 surrounds the fusible alloy element 3, and the contact area of the contact is larger and the heat transfer efficiency is higher than that of the linear contact, and the second electrode 6 and the fusible alloy element 3 can be fixed by welding or other methods.

More specifically, referring to fig. 3 and 4, the sheet-shaped base 61 includes a base 611 and an insertion portion 612 protruding from the center of the base 611, and the connection hole 63 is opened at the center of the insertion portion 612; an embedded groove 21 is formed in the middle of one end of the fusing assistant element 2, and a fixing hole 22 is formed in the bottom of the embedded groove 21; the base piece 611 abuts against the end face of the housing 1, the insertion portion 612 is inserted into the insertion groove 21, and the fusible alloy element 3 is inserted into the fixing hole 22. Through the cooperation of the embedded groove 21 and the embedded part 612, the sheet-shaped substrate 61 is attached to the fluxing agent element 2 more tightly, the fixing performance is improved, and meanwhile, the mounting positioning function can be provided.

More specifically, the material of the first electrode 4 and the second electrode 6 is one or a combination of copper, silver, nickel and tin. The first end cap 5 and the second end cap 7 are made of epoxy resin or silica gel.

More specifically, referring to fig. 5, according to another installation embodiment of the present invention, a limiting block 31 is disposed at a left end of the fusible alloy element 3, the limiting block 31 is annular, the fusible alloy element 3 passes through the connecting hole 63, the limiting block 31 abuts against a bottom of the end cover installation groove 62, and the second end cover 7 abuts against the limiting block 31. The fusible alloy element 3 and the second electrode 6 are fixed through the limiting block 31, meanwhile, the contact area between the limiting block 31 and the flaky substrate 61 increases the heat conduction efficiency, the connection strength between the fusible alloy element 3 and the second electrode 6 is improved, and the connection stability is guaranteed. It will be appreciated that the fusible alloy element 3 and the attachment hole 63 are in a transition or interference fit, and a closer contact is required between the two to ensure a sufficient heat-conducting contact surface.

More specifically, referring to fig. 5, a connecting portion 41 is disposed at a left end of the first electrode 4, and a cross-sectional area of the connecting portion 41 is larger than an area of the through hole 51, so that displacement does not occur between the first electrode 4 and the first end cap 5, and a connection performance between the first electrode 4 and the fusible alloy element 3 is ensured, and the fusible alloy element 3 is wrapped on the connecting portion 41, so that a contact area between the two is increased or decreased compared with welding and fixing. More specifically, the first electrode 4 is formed with an annular groove, and the connecting portion 41 is one end of the annular groove, and mainly increases the bonding force between the first electrode 4 and the first end cap 5.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A hybrid electrode thermal fuse, characterized in that: it comprises an outer casing, a fluxing agent element, a fusible alloy element, a first electrode, a first end cover, a second electrode and a second end cover, and the outer casing is covered in a the fuse element, the fuse element is coated on the fusible alloy element, the first electrode is connected to one end of the fusible alloy element, and the first electrode passes through the first end a cover, the first end cover abuts the casing and the fluxing agent element; the second electrode includes a sheet-like base body, an end-cover mounting groove, a connecting hole and a pin, and the end-cover mounting groove is opened in the sheet-like In the middle of the base body, the connecting hole penetrates through the bottom of the end cap installation groove and penetrates the sheet-like base body, the pins are formed by extending from the edge of the sheet-like base body, and the second electrode is installed at the other end of the housing, so The other end of the fusible alloy element is sleeved in the connection hole and fixed to the second electrode, and the second end cover is installed in the end cover installation groove.

2 . The hybrid electrode thermal fuse according to claim 1 , wherein the first electrode is a linear electrode, the second electrode is a circular sheet electrode, and the second electrode is perpendicular to the In the fusible alloy element, the diameter of the second electrode is the same as the diameter of the casing.

3 . The hybrid electrode thermal fuse according to claim 2 , wherein the sheet-shaped base body comprises a base sheet and an embedded portion protruding from the center of the base sheet, and the connection hole is opened in the center of the embedded portion. 4 . ; The shell is a hollow cylindrical shape, the middle part of one end of the flux element is provided with an embedded groove, and the bottom of the embedded groove is provided with a fixing hole; the substrate abuts the end face of the shell, and the embedded part Inserted into the insertion groove, the fusible alloy element is inserted into the fixing hole.

4 . The hybrid electrode thermal fuse according to claim 3 , wherein the diameter of the first electrode is larger than the diameter of the fixing hole. 5 .

5 . The hybrid electrode thermal fuse according to claim 3 , wherein the left end of the first electrode is provided with a connecting portion, the middle portion of the first end cover is provided with a through hole, and the horizontal portion of the connecting portion is provided with a through hole. The cross-sectional area is larger than the area of the through hole; the fusible alloy element covers the connecting portion.

6 . The hybrid electrode thermal fuse according to claim 1 , wherein the first electrode and the fusible alloy element are fixed by welding. 7 .

7 . The hybrid electrode thermal fuse according to claim 1 , wherein the material of the first electrode and the second electrode is one or a combination of copper, silver, nickel, and tin. 8 .

8 . The hybrid electrode thermal fuse according to claim 1 , wherein the material of the casing is one or a combination of plastic, ceramic, and ceramic glass, and the materials of the first end cover and the second end cover are 8 . Epoxy or silicone.