CN219350132U

CN219350132U - Temperature fuse

Info

Publication number: CN219350132U
Application number: CN202222551004.1U
Authority: CN
Inventors: 何仁东; 许由生
Original assignee: Xiamen Set Electronics Co Ltd
Current assignee: Xiamen Set Electronics Co Ltd
Priority date: 2022-09-22
Filing date: 2022-09-22
Publication date: 2023-07-14
Anticipated expiration: 2032-09-22

Abstract

The utility model provides a temperature fuse, which comprises a shell, a first pin, a temperature sensing body, a metal elastic piece and a second pin which are sequentially and fixedly connected, wherein the temperature sensing body and the metal elastic piece are arranged in the shell, the middle parts of the first pin and the second pin are respectively fixed on the shell, the metal elastic piece is in a stretched elastic deformation state, the temperature fuse is connected with the two pins through the metal elastic piece, the temperature sensing body is used as a welding flux of the metal elastic piece and one of the pins, when the temperature sensing body reaches the melting point temperature, the metal elastic piece realizes quick disconnection of the pins by means of larger contraction force, reduces arc generation, protects circuit safety, and controls an electric gap after disconnection through the contraction amount of the metal elastic piece, so that the temperature fuse can be applied to a high-voltage circuit.

Description

Temperature fuse

Technical Field

The utility model relates to the field of electronic elements, in particular to a temperature fuse.

Background

The temperature fuse is an over-temperature protection component, and when the protected electronic equipment generates abnormal fault heat and the temperature reaches the fusing temperature of the temperature fuse, the fuse is fused, so that a circuit is cut off. At present, most of temperature fuses rely on the surface tension of low-melting-point alloy and the acting force of fluxing agent to disconnect a temperature sensing body, so that the fusing speed is low, quick fusing in a high-voltage circuit is difficult to achieve, and particularly, the direct current on-off capability is poor.

Disclosure of Invention

The technical problems to be solved by the utility model are as follows: provided is a thermal fuse in which an internal temperature-sensitive fusing part is connected by a stretched metal elastic member, thereby enabling quick disconnection and enabling control of a gap after disconnection to adapt to a high voltage circuit.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a temperature fuse, includes casing and fixed connection's first pin, temperature sensing body, metal elastic component and second pin in proper order, temperature sensing body and metal elastic component set up in the casing, first pin with the middle part of second pin is fixed respectively on the casing, metal elastic component is in tensile elastic deformation state.

Further, the expansion and contraction amount of the metal elastic piece is larger than 4 mm.

Further, the metal elastic piece is a continuously bent sheet body or a spiral spring body.

Further, one end of the metal elastic piece is welded with one end of the first pin through the temperature sensing body, and the other end of the metal elastic piece is welded or riveted with one end of the second pin.

Further, the casing includes casing and lower casing, go up casing and lower casing fixed connection and form and hold the cavity, the temperature sensing body with metal elastic component set up in hold in the cavity, the both sides portion that is close to adjacent both sides board on a curb plate of lower casing is provided with a fixed orifices respectively, the limit portion that is close to relative both sides board in the lower casing corresponds two the fixed orifices is provided with first stopper respectively, the middle part of first pin and second pin is blocked respectively and is established two in the fixed orifices, and be close to metal elastic component's tip card is located between first stopper with the curb plate of lower casing.

Further, second limiting blocks are respectively arranged at positions, opposite to the two fixing holes, of the lower shell, and one ends, close to the metal elastic piece, of the first pins and the second pins respectively abut against the two second limiting blocks.

Further, the shell comprises an accommodating shell and a fixing seat board, the accommodating shell is covered on the fixing seat board, the temperature sensing body and the metal elastic piece are accommodated in the accommodating shell, fixing long holes are respectively formed in two opposite sides of the fixing seat board, and one empty ends of the first pins and the second pins penetrate through the fixing long holes to be fixedly arranged on the fixing seat board.

Further, the shell is a plastic shell or a ceramic shell.

Further, the shell is a cylindrical shell, a semi-cylindrical shell or a prismatic shell.

The utility model has the beneficial effects that: the temperature sensing element is characterized in that a first pin, an alloy temperature sensing element with a low melting point, a stretched metal elastic element and a second pin are arranged in the shell and are sequentially connected to form an easily-melted conductor in an elastic elongation state, one empty end of the first pin and one empty end of the second pin extend out of the shell to be connected into a protected circuit as two poles, when the external temperature exceeds a safety limit, the temperature sensing element in the shell is excessively melted, and the metal elastic element is rapidly disconnected with the first pin through self-restoring shrinkage elastic force, so that the inside of the temperature fuse is rapidly melted, the protection circuit is safe, and an electric gap between one disconnected end of the metal elastic element and the first pin can be flexibly arranged through the shrinkage of the metal elastic element, so that the use requirements of an excessively-heated protection environment under high pressure and the like are met.

Drawings

Fig. 1 is a schematic diagram of an explosion structure of a temperature fuse according to a first embodiment of the present utility model;

FIG. 2 is a schematic diagram showing an internal structure of a thermal fuse in an unblown state according to a first embodiment of the present utility model;

fig. 3 is a schematic diagram illustrating an internal structure of a thermal fuse in a blown state according to a first embodiment of the present utility model;

fig. 4 is a schematic front view of a metal elastic member of an S-shaped continuous bent sheet body of a temperature fuse according to an embodiment of the utility model;

fig. 5 is a schematic side view of a metal elastic member of an S-shaped continuous bent sheet body of a temperature fuse according to an embodiment of the present utility model;

fig. 6 is a schematic front view of a metal elastic member of a circular coil spring body of a thermal fuse according to an embodiment of the present utility model;

fig. 7 is a schematic side view of a metal elastic member of a circular coil spring body of a thermal fuse according to an embodiment of the present utility model;

fig. 8 is a schematic front view of a metal elastic member of a square coil spring body of a thermal fuse according to an embodiment of the present utility model;

fig. 9 is a schematic side view of a metal elastic member of a coil spring body of a thermal fuse according to an embodiment of the present utility model;

fig. 10 is an exploded view of a thermal fuse according to a second embodiment of the present utility model;

FIG. 11 is a schematic diagram illustrating an internal structure of a thermal fuse in an unblown state according to a second embodiment of the present utility model;

fig. 12 is a schematic diagram illustrating an internal structure of a thermal fuse in a blown state according to a second embodiment of the present utility model.

Description of the reference numerals:

1. a housing; 11. an upper housing; 12. a lower housing; 121. a fixing hole; 122. a first limiting block; 123. a second limiting block; 13. a housing case; 14. a fixed seat board; 141. fixing the long hole;

2. a first pin; 3. a temperature sensing body; 4. a metal elastic member; 5. and a second pin.

Detailed Description

In order to describe the technical contents, the achieved objects and effects of the present utility model in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.

From the above description, the beneficial effects of the utility model are as follows: the temperature sensing element is characterized in that a first pin, an alloy temperature sensing element with a low melting point, a stretched metal elastic element and a second pin are arranged in the shell and are sequentially connected to form an easily-melted conductor in an elastic elongation state, one empty end of the first pin and one empty end of the second pin extend out of the shell to be connected into a protected circuit as two poles, when the external temperature exceeds a safety limit, the temperature sensing element in the shell is excessively melted, and the metal elastic element is rapidly disconnected with the first pin through self-restoring shrinkage elastic force, so that the inside of the temperature fuse is rapidly melted, the protection circuit is safe, and an electric gap between one disconnected end of the metal elastic element and the first pin can be flexibly arranged through the shrinkage of the metal elastic element, so that the use requirements of an excessively-heated protection environment under high pressure and the like are met.

As can be seen from the above description, the expansion and contraction amount of the metal elastic member is set to be greater than 4 mm, that is, the electrical gap after the electric conductor in the thermal fuse is fused is greater than 4 mm, so that the thermal fuse can adapt to a high-voltage environment with a voltage of 690V or more and has a good insulation effect.

From the above description, the end of the metal elastic member of the continuously bent sheet-shaped body has a larger connecting surface, so that the temperature sensing body and the pins are conveniently connected with the metal elastic member, and the metal elastic member of the spiral spring body can provide a larger elastic deformation amount under the same volume.

As can be seen from the above description, one end of the metal elastic member and one end of the first pin may be directly welded to the temperature sensing body alloy, so as to conduct the first pin and the metal elastic member to form an easily-melted node, and the other end of the metal elastic member and the second pin may be welded by solder or welded without solder or riveted to form a permanent fixed node, so that the easily-melted node at the temperature sensing body is rapidly disconnected when the temperature is over-heated, and the fixed node at the other end is kept connected, so that the metal elastic member contracts toward the second pin to form an electrical gap with the first pin.

As can be seen from the above description, the housing is configured as two open slot type upper and lower housings, the same side of the lower housing is configured with a fixing hole through which the first pin and the second pin pass, and the fixing hole on the corresponding side of the lower housing is configured with a first limiting block, so as to form a limiting structure for fixing the distance between the first pin and the second pin, thereby forming a stretched state of the metal elastic member when the conductor structure is fixed in the housing.

According to the description, the second limiting block is arranged at the end part position of the lower shell corresponding to the first pin and the second pin, so that three-face limiting is formed by matching with the side face of the lower shell and the first limiting block, the first pin and the second pin are stably fixed in the shell, and the first pin and the second pin are prevented from moving in and out of the shell to damage the connecting node.

As is apparent from the above description, the housing is provided with the accommodating case having the opening at one side and the accommodating structure of the fixing seat plate for sealing the opening of the accommodating case, the fixing seat plate may be provided with a thicker plate shape, the fixing seat plate is provided with the fixing slot hole penetrating in thickness for the first pin and the second pin to extend out of the housing, and the first pin and the second pin are inserted into the longer fixing slot hole to fix the first pin and the second pin relatively, so that the metal elastic member accommodated in the accommodating case is kept in a stretched state.

Further, the shell is a plastic shell or a ceramic shell.

The temperature fuse is suitable for being welded in a circuit for over-temperature protection, particularly suitable for a high-voltage circuit, the metal elastic piece is adopted in the conductor to connect two pins, the temperature sensing body is used as welding flux of the metal elastic piece and one of the pins, when the temperature sensing body is melted at the melting point temperature, the metal elastic piece is quickly disconnected with the pins by means of larger contraction force, the generation of electric arcs is reduced, the circuit is protected safely, and the electric gap after disconnection can be controlled by the contraction amount of the metal elastic piece, so that the temperature fuse can be applied to the high-voltage circuit.

Referring to fig. 1 to 9, a first embodiment of the present utility model is as follows:

a temperature fuse comprises a shell 1, a first pin 2, a temperature sensing body 3, a metal elastic piece 4 and a second pin 5, wherein a containing cavity is formed in the shell 1, one end of the first pin 2 is welded with one end of the temperature sensing body 3, the other end of the temperature sensing body 3 is welded with one end of the metal elastic piece 4, and a connection node between the metal elastic piece 4 and the first pin 2, which is easy to fuse, is formed; after the metal elastic piece 4 is stretched, the other end is fixedly connected with one end of the second pin 5, for example, a solder welding mode, a non-solder spot welding mode or a riveting mode is adopted, so that a connecting node for permanently fixing the metal elastic piece 4 and the second pin 5 is formed; the other end of the first pin 2 and the other end of the second pin 5 protrude from the housing 1 to the outside as two-pole connection portions for accessing the protected high-voltage circuit.

As shown in fig. 1, the casing 1 includes an upper casing 11 and a lower casing 12, where the upper casing 11 and the lower casing 12 are fixedly connected to form a containing cavity, and the temperature sensing body 3 and the metal elastic member 4 are disposed in the containing cavity. Two side parts of one side plate of the lower shell 12, which are close to two adjacent side plates, are respectively provided with a fixing hole 121, and two corresponding fixing holes 121 in the side part of the lower shell 12, which is close to two opposite side plates, are respectively provided with a first limiting block 122. The middle parts of the first pin 2 and the second pin 5 are respectively clamped in the two fixing holes 121, the middle parts of the first pin 2 and the second pin 5 are fixed on the shell 1, and the end part close to the metal elastic piece 4 is clamped between the first limiting block 122 and the side plate of the lower shell 12 so as to fix the part of the first pin 2 and the second pin 5 in the shell 1 at a certain interval, thereby keeping the metal elastic piece 4 in a stretching state when the connection is complete. The positions of the lower shell 12 opposite to the two fixing holes 121 are respectively provided with a second limiting block 123, and one ends of the first pins 2 and the second pins 5, which are close to the metal elastic piece 4, respectively lean against the two second limiting blocks 123, so that three surfaces of the first pins 2 and the second pins 5 are surrounded and limited by the first limiting block 122 and the side plates of the lower shell 12, and the first pins and the second pins 5 are prevented from moving in the in-out direction in the shell 1.

In this embodiment, the metal elastic member 4 is in a Z-shaped continuous bending sheet structure, the end shrinkage displacement of the metal elastic member 4 after the temperature sensing body 3 is fused is greater than 4 mm, that is, the distance between the metal elastic member 4 and the first pin 2 is greater than 4 mm, the housing 1 is in a prismatic empty shell structure, and in other equivalent embodiments, as shown in fig. 4 to 9, the metal elastic member 4 may also be in an S-shaped continuous bending sheet structure, a square spiral spring structure or a circular spiral spring structure; the shell 1 may also be a cylindrical shell or a semi-cylindrical shell, and the shell 1 is preferably a plastic shell or a ceramic shell, and the shell 1 made of other insulating materials may also be used.

The working principle of the temperature fuse of the utility model is as follows:

after the external temperature exceeds the safety limit, the temperature sensing body 3 is excessively melted, one end of the metal elastic piece 4 connected with the temperature sensing body is released, the metal elastic piece 4 can shrink to the side of the second pin 5 due to the elastic force of the metal elastic piece, so that the metal elastic piece rapidly breaks the electrical connection with the first pin 2 and the second pin 5, and the electrical gap between the end disconnected with the metal elastic piece and the first pin 2 is larger than 4 mm, so that a protected high-voltage circuit is broken.

Referring to fig. 10 to 12, a second embodiment of the present utility model is as follows:

a temperature fuse, according to the first embodiment, is different in that: the casing 1 comprises a holding shell 13 and a fixed seat board 14, the holding shell 13 is covered on the fixed seat board 14, the temperature sensing body 3 and the metal elastic piece 4 are held in the holding shell 13, fixed long holes 141 are respectively arranged on two opposite sides of the fixed seat board 14, and the empty ends of the first pin 2 and the second pin 5 penetrate through the fixed long holes 141 to be fixedly arranged on the fixed seat board 14.

In summary, according to the temperature fuse provided by the utility model, two pins are connected through the metal elastic piece, the temperature sensing body is used as the welding flux between the metal elastic piece and one of the pins, when the temperature sensing body is melted at the melting point temperature, the metal elastic piece is quickly disconnected from the pins by means of larger contraction force, the generation of electric arcs is reduced, the safety of a circuit is protected, and the electric gap after disconnection is controlled through the contraction amount of the metal elastic piece, so that the temperature fuse can be applied to a high-voltage circuit; and the shell is provided with a fixing structure, and the internal structure is simple and easy to manufacture.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent changes made by the specification and drawings of the present utility model, or direct or indirect application in the relevant art, are included in the scope of the present utility model.

Claims

1. The utility model provides a temperature fuse, its characterized in that includes casing and fixed connection's first pin, temperature sensing body, metal elastic component and second pin in proper order, temperature sensing body and metal elastic component set up in the casing, first pin with the middle part of second pin is fixed respectively on the casing, metal elastic component is in tensile elastic deformation state.

2. A thermal fuse according to claim 1, wherein said metal spring member stretches by an amount greater than 4 mm.

3. A thermal fuse according to claim 1, wherein said metal elastic member is a continuously bent sheet-like body or a coil spring body.

4. A thermal fuse according to claim 1, wherein one end of the metal elastic member is welded to one end of the first pin through the temperature sensing body, and the other end of the metal elastic member is welded or riveted to one end of the second pin.

5. The thermal fuse according to claim 1, wherein the housing comprises an upper housing and a lower housing, the upper housing and the lower housing are fixedly connected to form a containing cavity, the temperature sensing body and the metal elastic member are arranged in the containing cavity, two side portions, close to two adjacent side plates, of one side plate of the lower housing are respectively provided with a fixing hole, two side portions, close to two opposite side plates, of the lower housing are respectively provided with a first limiting block corresponding to the two fixing holes, middle portions of the first pin and the second pin are respectively clamped in the two fixing holes, and an end portion, close to the metal elastic member, of the lower housing is clamped between the first limiting block and the side plate of the lower housing.

6. The thermal fuse according to claim 5, wherein second limiting blocks are respectively arranged at positions, opposite to the two fixing holes, in the lower shell, and one ends, close to the metal elastic piece, of the first pin and the second pin are respectively abutted against the two second limiting blocks.

7. The thermal fuse according to claim 1, wherein the housing comprises a housing case and a fixing base plate, the housing case is covered on the fixing base plate, the temperature sensing body and the metal elastic member are accommodated in the housing case, fixing long holes are respectively formed in two opposite sides of the fixing base plate, and one free ends of the first pin and the second pin penetrate through the fixing long holes to be fixedly arranged on the fixing base plate.

8. A thermal fuse in accordance with claim 1, wherein said housing is a plastic or ceramic shell.

9. A thermal fuse according to claim 1, wherein the housing is a cylindrical, semi-cylindrical or prismatic hollow.