CN210052597U

CN210052597U - Over-temperature protection piezoresistor

Info

Publication number: CN210052597U
Application number: CN201921278541.5U
Authority: CN
Inventors: 谢玉云
Original assignee: Dongguan Qinhong Electronic Technology Co Ltd
Current assignee: Dongguan Qinhong Electronic Technology Co Ltd
Priority date: 2019-08-08
Filing date: 2019-08-08
Publication date: 2020-02-11
Anticipated expiration: 2029-08-08

Abstract

The utility model discloses an overheat protection's piezoresistor, including shell and piezoresistor body, the inner chamber of piezoresistor body is provided with the medium chip, the first electrode of left side fixedly connected with of medium chip, the right side fixedly connected with second electrode of medium chip, the first lead wire of soldering fixedly connected with is passed through to one side that the medium chip was kept away from to first electrode, the one end that the medium chip was kept away from to first lead wire extends to the outside of shell, the one end that the medium chip was kept away from to the second electrode is passed through soldering fixedly connected with fuse, the one end that the medium chip was kept away from to the fuse is passed through soldering fixedly connected with second lead wire. The utility model discloses a cooperation of shell, piezoresistor body, medium chip, first electrode, second electrode, first lead wire, fuse, second lead wire, hot melt adhesive partition body, insulating encapsulated layer and silica gel is used, possesses overheat protection's advantage, has solved the poor problem of current piezoresistor security.

Description

Over-temperature protection piezoresistor

Technical Field

The utility model relates to a resistor technical field specifically is an overheat protection's piezoresistor.

Background

The piezoresistor is a voltage-limiting element sensitive to voltage change, and is characterized in that: at a specified temperature, when the voltage exceeds a certain critical value, the resistance value of the varistor is sharply reduced, the current passing through the varistor is sharply increased, and the voltage and the current do not have a linear relationship, so the varistor is also called a nonlinear varistor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an overheat protection's piezo-resistor possesses overheat protection's advantage, has solved the poor problem of current piezo-resistor security.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides an overheat protection's piezoresistor, includes shell and piezoresistor body, the inner chamber of piezoresistor body is provided with the medium chip, the first electrode of left side fixedly connected with of medium chip, the right side fixedly connected with second electrode of medium chip, the first lead wire of soldering fixedly connected with is passed through to one side that the medium chip was kept away from to first electrode, the one end that the medium chip was kept away from to first lead wire extends to the outside of shell, the one end that the medium chip was kept away from to the second electrode is passed through soldering fixedly connected with fuse, the one end that the medium chip was kept away from to the fuse is passed through soldering fixedly connected with second lead wire, the one end that the fuse was kept away from to the second lead wire extends to the outside of shell.

Preferably, a hot melt adhesive separator is arranged between the fuse and the second electrode, and an insulating encapsulating layer is filled in the inner cavity of the piezoresistor body.

Preferably, the bottom of the inner cavity of the shell is provided with a through hole, and the inner cavity of the shell is filled with silica gel.

Preferably, the silica gel is a high-activity adsorption material, belongs to an amorphous substance, and has a stable chemical property and no combustion because the main component is silicon dioxide.

Preferably, the insulating encapsulating layer is formed by high-temperature-resistant epoxy resin, and the high-temperature-resistant epoxy resin can resist the temperature higher than the melting point of the fuse and reach the 94V-0 standard.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. the utility model discloses a cooperation of shell, piezoresistor body, medium chip, first electrode, second electrode, first lead wire, fuse, second lead wire, hot melt adhesive partition body, insulating encapsulated layer and silica gel is used, possesses overheat protection's advantage, has solved the poor problem of current piezoresistor security.

2. The utility model discloses a set up the shell, can be convenient for protect the piezoresistor body, avoid the piezoresistor body the condition that damages to appear when using, through setting up the fuse, when the piezoresistor body temperature of can being convenient for reaches or surpasss a certain upper limit value, the fuse fuses, and the cut-off circuit is connected to avoid insulating encapsulating layer high temperature to be fired and arouse the conflagration, through setting up silica gel, can avoid the piezoresistor body phenomenon that catches fire to appear.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic diagram of the varistor body of the present invention.

In the figure: 1. a housing; 2. a varistor body; 3. a dielectric chip; 4. a first electrode; 5. a second electrode; 6. a first lead; 7. a fuse; 8. a second lead; 9. a hot melt adhesive separator; 10. an insulating encapsulation layer; 11. silica gel.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, an overheat protection varistor comprises a casing 1, a varistor body 2 is protected conveniently by arranging the casing 1, the varistor body 2 is prevented from being damaged during use, and the varistor body 2 is provided with a dielectric chip 3 in an inner cavity of the varistor body 2, a first electrode 4 is fixedly connected to a left side of the dielectric chip 3, a second electrode 5 is fixedly connected to a right side of the dielectric chip 3, a first lead 6 is fixedly connected to a side of the first electrode 4 away from the dielectric chip 3 by soldering, one end of the first lead 6 away from the dielectric chip 3 extends to an outside of the casing 1, one end of the second electrode 5 away from the dielectric chip 3 is fixedly connected to a fuse 7 by soldering, and when a temperature of the varistor body 2 reaches or exceeds a certain upper limit value by arranging the fuse 7, the fuse 7 is fused, circuit connection is cut off, so that fire caused by overhigh temperature of the insulating encapsulating layer 10 is avoided, one end of the fuse 7, far away from the dielectric chip 3, is fixedly connected with a second lead 8 through soldering, one end of the second lead 8, far away from the fuse 7, extends to the outside of the shell 1, a hot melt adhesive separating body 9 is arranged between the fuse 7 and the second electrode 5, the insulating encapsulating layer 10 is filled in the inner cavity of the piezoresistor body 2, a through hole is formed in the bottom of the inner cavity of the shell 1, the inner cavity of the shell 1 is filled with silica gel 11, the phenomenon that the piezoresistor body 2 catches fire can be avoided through arrangement of the silica gel 11, the silica gel 11 is a high-activity adsorbing material and belongs to an amorphous substance, the main component is silicon dioxide, the chemical property is stable and does not burn, the insulating encapsulating layer 10 is formed by high-temperature-, the varistor reaches the 94V-0 standard, and has the advantages of overheat protection and solves the problem of poor safety of the conventional varistor through the matched use of the shell 1, the varistor body 2, the dielectric chip 3, the first electrode 4, the second electrode 5, the first lead 6, the fuse 7, the second lead 8, the hot melt adhesive separator 9, the insulating encapsulating layer 10 and the silica gel 11.

When the temperature of the piezoresistor body 2 reaches or exceeds a certain upper limit value, the fuse 7 is fused, the circuit connection is cut off, the piezoresistor body 2 is not electrified to generate heat any more, so that the situation that fire disasters are caused due to overhigh temperature of the insulating encapsulating layer 10 is avoided, the upper ends of the fuse 7 and the second lead 8 are separated from the second electrode 5 by the hot melt adhesive separating body 9 to play an insulating role, when the temperature of the piezoresistor body 2 reaches the certain upper limit value, the fuse 7 is fused, meanwhile, the fused fuse 7 is fused by the hot melt adhesive separating body 9, and the fuse 7 can be prevented from being connected again.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An overheat protected varistor comprising a housing (1) and a varistor body (2), characterized in that: the inner chamber of piezoresistor body (2) is provided with medium chip (3), the first electrode of left side fixedly connected with (4) of medium chip (3), the right side fixedly connected with second electrode (5) of medium chip (3), first electrode (4) are kept away from one side of medium chip (3) and are passed through soldering fixedly connected with first lead (6), the one end that medium chip (3) were kept away from in first lead (6) extends to the outside of shell (1), the one end that medium chip (3) were kept away from in second electrode (5) is passed through soldering fixedly connected with fuse (7), the one end that medium chip (3) were kept away from in fuse (7) is passed through soldering fixedly connected with second lead (8), the one end that fuse (7) were kept away from in second lead (8) extends to the outside of shell (1).

2. An overheat protected varistor according to claim 1, wherein: a hot melt adhesive separator (9) is arranged between the fuse (7) and the second electrode (5), and an insulating encapsulating layer (10) is filled in the inner cavity of the piezoresistor body (2).

3. An overheat protected varistor according to claim 1, wherein: the bottom of the inner cavity of the shell (1) is provided with a through hole, and the inner cavity of the shell (1) is filled with silica gel (11).

4. An overheat protected varistor according to claim 3, wherein: the silica gel (11) is a high-activity adsorption material, belongs to an amorphous substance, and has stable chemical property and no combustion as the main component of silicon dioxide.

5. An overheat protected varistor according to claim 2, wherein: the insulating encapsulating layer (10) is formed by high-temperature-resistant epoxy resin, the high-temperature-resistant epoxy resin is higher than the melting point of the fuse (7), and the standard of 94V-0 is achieved.