CN212365898U

CN212365898U - Self-recovery fuse

Info

Publication number: CN212365898U
Application number: CN202020842630.4U
Authority: CN
Inventors: 杨晨
Original assignee: Shanghai Charles Electronics Co ltd
Current assignee: Shanghai Charles Electronics Co ltd
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2021-01-15
Anticipated expiration: 2030-05-15

Abstract

The utility model discloses a self-recovery fuse, including fuse body and protection casing, the fuse main part includes the box body, first conducting block and second conducting block that the fixed connection interval was arranged in the box body, first conducting block is connected with the bimetallic strip, the second conducting block is connected with the conducting strip of Z shape, still be provided with the support in the box body, the bottom of conducting strip is supported on the support, the top of conducting strip and the bottom overlap joint of bimetallic strip, first conducting block and second conducting block still respectively are connected with a pin, the pin is worn out from the box body; the protection casing includes guard plate and lower guard plate, goes up the guard plate and is connected through being fixed in a plurality of spliced poles between the two with lower guard plate, goes up guard plate, lower guard plate and a plurality of spliced poles and constitutes an open-ended holding chamber in one side jointly. Can live fuse body parcel through the protection casing, avoid the fuse body directly to receive the destruction of external environment, and then improved the life of self-resuming fuse.

Description

Self-recovery fuse

Technical Field

The utility model relates to a technical field of fuse particularly, relates to a self-resuming fuse.

Background

The self-recovery fuse element is connected in series in the circuit and is in a low-resistance state under normal conditions, so that the normal work of the circuit is ensured, when the circuit is short-circuited or abnormal large current is input, the impedance of the element is increased due to self-heating of the element, the current is limited to be small enough, and the overcurrent protection effect is realized. Meanwhile, when the temperature of the external environment rises suddenly, the over-temperature protection effect can be achieved after the environment reaches the switching temperature of the product.

The existing self-recovery fuse exposes the body of the fuse in the external environment, so that the fuse is easily damaged by the external environment, and the service life of the self-recovery fuse is reduced.

An effective solution to the problems in the related art has not been proposed yet.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned technical problem among the correlation technique, the utility model provides a self-resuming fuse can live fuse body parcel through the protection casing, avoids the fuse body directly to receive external environment's destruction, and then has improved the life of self-resuming fuse.

In order to achieve the technical purpose, the technical scheme of the utility model is realized as follows:

a self-recovery fuse comprises a fuse body and a protective cover, wherein the fuse body comprises a box body, a first conductive block and a second conductive block which are arranged at intervals are fixedly connected in the box body, the first conductive block is connected with a bimetallic strip, the second conductive block is connected with a Z-shaped conductive strip, a support is further arranged in the box body, the bottom of the conductive strip is supported on the support, the top of the conductive strip is in lap joint with the bottom of the bimetallic strip, the first conductive block and the second conductive block are respectively connected with a pin, and the pins penetrate out of the box body; the protection casing includes guard plate and lower guard plate, go up the guard plate with the guard plate is connected through being fixed in a plurality of spliced poles between the two down, go up the guard plate down the guard plate and a plurality of the spliced pole constitutes an open-ended holding chamber of one side jointly, the holding chamber with the fuse main part cooperatees, a plurality of fixing bases of edge fixedly connected with of guard plate down, the fixing base is run through from top to bottom by the through-hole.

Furthermore, the bimetallic strip is formed by riveting a copper sheet and an iron sheet.

Furthermore, the copper sheet is made of manganese-nickel-copper alloy.

Furthermore, the top of the support is provided with a U-shaped groove corresponding to the conducting strip.

Furthermore, a plurality of radiating holes which are arranged in an array mode are formed in the upper protection plate and the lower protection plate.

Furthermore, the upper protection plate is fixedly connected with a plurality of heat dissipation fins which are arranged in parallel, and each heat dissipation fin is located between two adjacent heat dissipation holes.

The utility model has the advantages that: the first conductive block, the bimetallic strip, the conductive strip and the second conductive block form a loop through the support of the support, when the current is too high, the bimetallic strip bends upwards due to too high temperature and is separated from the Z-shaped conductive strip, the circuit is protected from accidents due to overload, after the circuit is disconnected, the temperature of the bimetallic strip is reduced, the bimetallic strip returns to be in contact with the Z-shaped conductive strip, and the circuit is switched on; can live fuse body parcel through the protection casing, avoid the fuse body directly to receive the destruction of external environment, and then improved the life of self-resuming fuse.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a top view of a self-restoring fuse according to an embodiment of the present invention;

FIG. 2 is a side view of the self-restoring fuse according to FIG. 1;

fig. 3 is a cross-sectional view of a fuse body according to an embodiment of the invention.

In the figure:

1. a box body; 2. a first conductive block; 3. a second conductive block; 4. a bimetal; 5. a conductive sheet; 6. a support; 7. a pin; 8. an upper protection plate; 9. a lower guard plate; 10. connecting columns; 11. heat dissipation holes; 12. a fixed seat; 13. and (4) radiating fins.

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 all belong to the protection scope of the present invention.

As shown in fig. 1-3, according to the embodiment of the present invention, a self-recovery fuse includes a fuse body and a protective cover, the fuse body includes a box body 1, a first conductive block 2 and a second conductive block 3 arranged at intervals are fixedly connected in the box body 1, the first conductive block 2 is connected to a bimetallic strip 4, the second conductive block 3 is connected to a Z-shaped conductive strip 5, a support 6 is further arranged in the box body 1, the bottom of the conductive strip 5 is supported on the support 6, the top of the conductive strip 5 is overlapped with the bottom of the bimetallic strip 4, the first conductive block 2 and the second conductive block 3 are respectively connected to a pin 7, and the pin 7 penetrates out of the box body 1; the protection casing includes guard plate 8 and lower guard plate 9, go up guard plate 8 with guard plate 9 is connected through being fixed in a plurality of spliced poles 10 between the two down, go up guard plate 8 guard plate 9 down and a plurality of spliced pole 10 constitutes an open-ended holding chamber in one side jointly, the holding chamber with the fuse main part cooperatees, a plurality of fixing bases 12 of edge fixedly connected with of guard plate 9 down, fixing base 12 is run through from top to bottom by the through-hole.

In a specific embodiment of the present invention, the bimetallic strip 4 is riveted by a copper sheet and an iron sheet.

In a specific embodiment of the present invention, the copper sheet is made of manganese-nickel-copper alloy.

In an embodiment of the present invention, a U-shaped groove corresponding to the conductive strip 5 is formed at the top of the support 6.

In an embodiment of the present invention, a plurality of heat dissipation holes 11 arranged in an array are disposed on the upper protection plate 8 and the lower protection plate 9.

The utility model discloses a specific embodiment, still fixedly connected with a plurality of parallel arrangement's radiating fin 13 on the upper shield plate 8, every radiating fin 13 is located adjacent two between the louvre 11.

For the convenience of understanding the above technical solutions of the present invention, the above technical solutions of the present invention are explained in detail through specific use modes below.

The self-recovery fuse comprises a fuse body and a protective cover.

The fuse body comprises a box body 1, a first conductive block 2, a second conductive block 3, a bimetallic strip 4, a conductive sheet 5, a support 6 and a pin 7. The box body 1 comprises a box body and a box cover, and the box body and the box cover can be connected through screws. The side wall of the box body is embedded with a first conductive block 2 and a second conductive block 3, the first conductive block 2 is respectively connected with a bimetallic strip 4 and a pin 7, and the second conductive block 3 is respectively connected with a conductive strip 5 and another pin 7. The first conductive block 2 is electrically connected to the second conductive block 3 through the bimetal 4 and the conductive plate 5, which are overlapped with each other. The support 6 functions to support the conductive sheet 5. The box body 1 is made of polytetrafluoroethylene to achieve an insulating effect, and the first conductive block 2 and the second conductive block 3 are made of tin. In order to ensure the conductivity of the bimetallic strip 4 and to bend the bimetallic strip after being heated, the bimetallic strip 4 is made of manganese-nickel-copper alloy material.

The protection casing includes that upper protection plate 8, lower protection plate 9 and a plurality of spliced pole 10 enclose into the holding chamber together, upper protection plate 8, lower protection plate 9 and a plurality of spliced pole 10, and one side opening in holding chamber is used for putting into the fuse body. The upper end of each connecting column 10 is fixed on the upper protection plate 8, the lower end of each connecting column 10 is fixed on the lower protection plate 9, the upper ends of the connecting columns 10 are located at the edge position of the upper protection plate 8, the lower ends of the connecting columns 10 are located at the edge position of the lower protection plate 9, and the fuse body is contained in the containing cavity. Through last guard plate 8, the holding chamber of the place fuse body that forms between lower guard plate 9 and a plurality of spliced pole 10, fuse body holding is in this holding intracavity, thereby can realize the protection to the fuse body, make the protection casing can wrap up the fuse body, avoid the fuse body directly to receive external environment's destruction, and then improved the life of self-resuming fuse, go up guard plate 8, louvre 11 has all been seted up down on guard plate 9, can make to go up guard plate 8 and guard plate 9 down have certain radiating effect through setting up louvre 11, thereby can improve the speed of resumeing original state, make the fuse body have the effect of quick recovery, radiating fin 13 has still been set up on last guard plate 8 for further improvement radiating effect. A plurality of fixing seats 12 are fixed on the lower protection plate 9, the fixing seats 12 are penetrated through by through holes, screws or bolts can be penetrated into the through holes, and the protection cover can be fixed on the circuit board through the fixing seats 12.

When the fuse is used specifically, the fuse body is connected in series into a circuit through the two pins 7, and when the current is too large, the bimetallic strip 4 expands and bends due to the too large current to be separated from the conducting strip 5, so that the circuit is disconnected, the fuse fusing effect is achieved, and the circuit is protected; when the bimetal 4 cools down gradually, the original position is restored to be in contact with the conductive plate 5, so that the circuit is connected.

To sum up, with the help of the technical scheme of the utility model, the first conductive block, the bimetallic strip, the conductive strip and the second conductive block form a loop through the support of the support, when the current is too large, the bimetallic strip bends upwards due to too high temperature and is separated from the Z-shaped conductive strip, the protection circuit can not be in accident due to overload, when the circuit is disconnected, the temperature of the bimetallic strip is reduced, the bimetallic strip restores to be in contact with the Z-shaped conductive strip, and the circuit is connected; can live fuse body parcel through the protection casing, avoid the fuse body directly to receive the destruction of external environment, and then improved the life of self-resuming fuse.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The self-recovery fuse comprises a fuse body and a protective cover, and is characterized in that the fuse body comprises a box body (1), wherein a first conductive block (2) and a second conductive block (3) which are arranged at intervals are fixedly connected in the box body (1), the first conductive block (2) is connected with a bimetallic strip (4), the second conductive block (3) is connected with a Z-shaped conductive strip (5), a support (6) is further arranged in the box body (1), the bottom of the conductive strip (5) is supported on the support (6), the top of the conductive strip (5) is in lap joint with the bottom of the bimetallic strip (4), the first conductive block (2) and the second conductive block (3) are respectively connected with a pin (7), and the pin (7) penetrates out of the box body (1); the protection casing includes guard plate (8) and lower guard plate (9), go up guard plate (8) with guard plate (9) are connected through being fixed in a plurality of spliced poles (10) between the two down, go up guard plate (8) lower guard plate (9) and a plurality of spliced pole (10) constitute an one side open-ended holding chamber jointly, the holding chamber with the fuse main part cooperates, a plurality of fixing bases (12) of edge fixedly connected with of lower guard plate (9), fixing base (12) are run through from top to bottom by the through-hole.

2. Self-restoring fuse according to claim 1, characterized in that the bimetallic strip (4) is riveted by copper and iron strips.

3. The self-healing fuse according to claim 2, wherein the copper sheet is made of manganese-nickel-copper alloy.

4. The self-healing fuse according to claim 1, characterized in that the top of the support (6) is provided with a U-shaped slot corresponding to the conducting strip (5).

5. The self-recovery fuse according to claim 1, wherein the upper protection plate (8) and the lower protection plate (9) are provided with a plurality of heat dissipation holes (11) arranged in an array.

6. The self-healing fuse according to claim 5, wherein a plurality of heat dissipation fins (13) arranged in parallel are further fixedly connected to the upper protection plate (8), and each heat dissipation fin (13) is located between two adjacent heat dissipation holes (11).