CN220324402U

CN220324402U - Melt and fuse comprising same

Info

Publication number: CN220324402U
Application number: CN202323355530.1U
Authority: CN
Inventors: 陈超; 王华胜; 刘超; 李高伟; 胡勋; 贾竞; 王浩
Original assignee: Copper Xi'an Fuse Co ltd
Current assignee: Copper Xi'an Fuse Co ltd
Priority date: 2023-12-11
Filing date: 2023-12-11
Publication date: 2024-01-09
Anticipated expiration: 2033-12-11

Abstract

The utility model belongs to the field of fuses, and provides a melt and a fuse comprising the melt, wherein the melt comprises a plurality of first fracture areas arranged on a first plane and at least one second fracture area arranged on a second plane protruding from the first plane, the at least one second fracture area is arranged between any two adjacent first fracture areas in the plurality of first fracture areas, the first fracture areas and the second fracture areas are respectively provided with a plurality of through holes, and the distance between the first plane and the second plane is 2mm-5mm. The melt can prevent the mutual interference of the melt fracture arcs and effectively extinguish the arc, thereby effectively solving the breaking problems of high voltage and low current.

Description

Melt and fuse comprising same

Technical Field

The utility model belongs to the field of fuses, and particularly relates to a melt and a fuse comprising the melt.

Background

A fuse is an electrical appliance that uses the effect of current heat to blow a melt, thereby breaking a circuit. When fault current higher than rated value passes through the fuse, heat generated by the resistor at the narrow neck position is rapidly increased, and if the temperature of the melt reaches the melting point, the melting and vaporization of the conductor occur, so that the fault overcurrent is cut off.

Along with the development of society and science and technology, energy storage industries such as photovoltaic, wind power and the like are also greatly developed, the energy storage industry has higher and higher requirements on the voltage level of the fuse, and the electric arc characteristic under the high voltage condition becomes a constraint factor of effective breaking of the fuse. The higher the voltage level, the greater the impact on the small current breaking capability of the fuse. Specifically, the higher the voltage, the greater the arc energy; the smaller the current, the longer the fusing time. The breaking capacity of the fuse is seriously affected by the long-time action of the large arc energy.

At present, the voltage of the photovoltaic fuse is up to 1500 VDC, and the high voltage can be disconnected by increasing the number of rows of melt fracture, namely increasing the length of melt, but in a limited space, the effective disconnection of small current and high voltage is more difficult. Particularly for copper melt, the capability of breaking high voltage and small current is difficult.

Disclosure of Invention

It is therefore an object of the present utility model to overcome the above-mentioned drawbacks of the prior art and to provide a melt characterized by comprising a plurality of first fracture zones arranged on a first plane and at least one second fracture zone arranged on a second plane protruding from the first plane, the at least one second fracture zone being arranged between any two adjacent first fracture zones of the plurality of first fracture zones, and the first fracture zone and the second fracture zone being provided with a plurality of through holes, respectively.

According to the melt of the present utility model, preferably, the plurality of first fracture regions are symmetrically arranged on both sides of the at least one second fracture region.

According to the melt of the utility model, preferably, two second fracture zones are provided on the second plane.

According to the melt of the utility model, preferably a groove is provided between the two second fracture zones.

According to the melt of the utility model, the trough preferably also comprises an intermediate region which is further provided with a second material portion, the melting point of which is lower than the melting point of the material of the melt.

According to the melt of the present utility model, preferably, the material of the melt is copper or copper silver composite, and the second material is tin.

According to the melt of the present utility model, preferably, the plurality of first fracture regions are connected by bending regions.

According to the melt of the present utility model, preferably, the first plane and the second plane are spaced apart by a distance of 2mm to 5mm.

The melt according to the present utility model preferably further comprises at least one third fracture region provided on a third plane protruding from the first plane, the at least one third fracture region being provided between any two adjacent first fracture regions of the plurality of first fracture regions, the third fracture region being provided with a plurality of through holes.

The present utility model also provides a fuse comprising: at least one melt according to the present utility model and first and second terminal plates electrically connected to both ends of the melt.

Compared with the prior art, the melt can prevent the mutual interference of the melt fracture arcs and effectively extinguish the arc, thereby effectively solving the breaking problems of high voltage and low current.

Drawings

Embodiments of the utility model are further described below with reference to the accompanying drawings, in which:

FIG. 1 is a schematic cross-sectional view of a melt according to one embodiment of the utility model;

FIG. 2 is a schematic cross-sectional view of a melt according to another embodiment of the present utility model;

FIG. 3 is an enlarged view of a bending region of a melt according to an embodiment of the present utility model;

fig. 4 shows a schematic cross-sectional view of a fuse according to an embodiment of the present utility model.

Detailed Description

For the purpose of making the technical solutions and advantages of the present utility model more apparent, the present utility model will be further described in detail by way of specific embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. In the drawings, like reference numerals refer to like parts.

In order to achieve a small current breaking capability at a high voltage (e.g., 1500 VDC) level, arc extinction needs to be designed, and the main modes of arc extinction include arc lengthening, arc cutting, dielectric medium addition, and the like, and a fuse generally adopts an arc lengthening mode to perform arc extinction.

Referring to the schematic cross-sectional view of the melt of the embodiment of the present utility model shown in fig. 1, the melt includes a series of coplanar fracture regions (also referred to as necks) 101, and the fracture regions 101 are provided with a plurality of through holes (not shown). Preferably, adjacent fracture zones 101 are separated by a bending zone 102 to enhance the ability of the melt to flex. In addition, a groove 103 is provided in the middle of the melt, in particular between the middle two fracture zones 101. The melt of this embodiment is made of a first material (e.g. copper, copper silver composite) and the intermediate region of the trough 103 is further provided with a second material (e.g. tin) having a melting point lower than the melting point of the first material. When a large current (for example, about 50 KA) flows through the melt, the fracture regions 101 are desirably opened simultaneously, the voltages of the fractures are equal, and the arcs generated by the fractures are on the same plane, and the arc-drawing lengths are equal, but when the arc-drawing lengths are insufficient to extinguish the arcs, the arcs interfere with each other, and the breaking fails. When a small current (e.g., about 800A) flows through the melt, the middle tin bath breaks first due to the low melting point of tin, but the arc at bath 103 is complex due to the interaction of tin, melt, and arc, etc., and breaking can fail when the arc extinguishing distance is insufficient. Those skilled in the art will appreciate that when a large current is passed through the melt, the melt will melt in a very short period of time (e.g., about 20 ms) without having to prioritize the melt and tin bath break.

In view of this, another embodiment of the utility model provides a melt, see a schematic cross-sectional view of the melt of this embodiment shown in fig. 2. The melt of this example is based on the melt shown in fig. 1 with a part of the middle comprising at least two rows of fracture zones being raised. The melt of this embodiment includes ten first fracture regions (also referred to as necks) 201 provided on the first plane P1, and two second fracture regions 204 provided on the second plane P2, a plurality of through holes (not shown in the drawing) being provided on the first fracture regions 201 and the second fracture regions 204, respectively, the first fracture regions 201 being provided on both sides of the second fracture regions 204, specifically, five first fracture regions 201 on the left and right sides of the second plane P2, respectively. Preferably, two adjacent first fracture regions 201 are separated by a bending region 202, and preferably, a groove 203 is provided between two second fracture regions 204. Similar to the previous embodiments, the melt is made of a first material (e.g., copper silver composite) and the intermediate region of the trough 203 is further provided with a second material (e.g., tin) having a melting point lower than the melting point of the first material. In this embodiment, the first plane P1 and the second plane P2 are preferably spaced apart by 2-5mm. The purpose of this embodiment is to employ the second fracture region 204 to space apart two adjacent first fracture regions 201, thereby elongating the arc.

When large current is broken, ideally, each fracture region (including the first fracture region and the second fracture region) is broken at the same time, and the voltages of the fracture regions are equal, and the distance between the arc at the second fracture region 204 and the arc at the first fracture region 201 is elongated, which is insufficient for mutual interference, so that breaking is not affected.

When the small current is broken, the groove 203 in the middle of the second fracture area 204 is broken firstly due to the low melting point of the groove 203, the distance between the arc in the middle part and the arc in the first fracture area 201 is prolonged, the mutual interference is insufficient, and the breaking is not affected.

Therefore, the melt of the embodiment can prevent mutual interference of arc at each fracture and effectively extinguish arc, thereby effectively solving the problem of breaking at high voltage and low current.

In this embodiment, see the enlarged view of the bending region 202 in fig. 2 shown in fig. 3. The bending region 202 is triangular and is formed by two inclined sections 2021 and 2022, which are outside the first plane P1. Those skilled in the art will appreciate that the bending region 202 is used to stretch or compress the melt during installation and is not limited to triangular, but may be circular arc, rectangular, etc. in any shape suitable for stretching or compressing the melt during installation.

In an embodiment of the utility model, the width of the fracture zone and the size of the through holes provided in the fracture zone are determined according to the actual situation.

According to other embodiments of the present utility model, the second fracture region 204 provided on the second plane P2 is not limited to two, and may be one or more than two. If more than two second fracture regions 204 are provided on the second plane P2, a groove 203 is preferably provided between any two second fracture regions 204.

According to other embodiments of the present utility model, the number of the first fracture regions 201 provided on the first plane P1 is not limited to ten, and the number of the fracture regions is set according to the need, and the longer the fracture regions, the longer the melt, the higher the voltage that can be broken.

According to other embodiments of the utility model, the second plane P2 does not protrude from the middle area of the whole melt, i.e. the first fracture areas 201 are not symmetrically arranged on both sides of the second fracture area 204, the second fracture areas 204 may be arranged to the left or to the right of the whole melt area, e.g. for the embodiment shown in fig. 2 there are two first fracture areas 201 to the left of the second plane P2, eight first fracture areas 201 to the right, etc.

According to other embodiments of the utility model, the melt further comprises a third plane protruding from the first plane P1, on which third plane at least one third fracture zone is provided for spacing two adjacent first fracture zones. Those skilled in the art will appreciate that the protrusion planes contained in the melt of the present utility model are not limited to two.

Embodiments of the present utility model also provide a fuse, as shown in a schematic cross-sectional view of the fuse of the embodiment of fig. 4, the fuse 400 includes four melts 4001 connected in parallel with each other and terminal pieces 4002 and 4003 electrically connected to both ends of the melts 4001, preferably further including a housing 4004 for enclosing the melts 4001. The structure of the melt 4001 of this embodiment is the same as that of the melt described in the previous embodiment, and will not be described here again.

Those skilled in the art can set the number of melts included in the fuse according to the rated current requirement, and the fuse includes at least one melt.

In the present utility model, the distance between the first plane and the projection plane is not limited to 2-5mm, and the plane interval may be designed according to practical situations, as long as the arc can be elongated to cut off the arc interference.

While the utility model has been described in terms of preferred embodiments, the utility model is not limited to the embodiments described herein, but encompasses various changes and modifications that may be made without departing from the scope of the utility model.

Claims

1. A melt comprising a plurality of first fracture regions disposed on a first plane and at least one second fracture region disposed on a second plane protruding from the first plane, the at least one second fracture region being disposed between any two adjacent first fracture regions of the plurality of first fracture regions, and the first fracture region and the second fracture region being provided with a plurality of through holes, respectively, the first plane and the second plane being spaced apart by a distance of 2mm to 5mm.

2. The melt of claim 1, wherein the plurality of first fracture regions are symmetrically disposed on either side of the at least one second fracture region.

3. Melt according to claim 1 or 2, characterized in that two second fracture zones are provided on the second plane.

4. A melt as claimed in claim 3, characterised in that a groove is provided between the two second fracture zones.

5. The melt as recited in claim 4, wherein the intermediate region of the trough is further provided with a second material portion having a melting point lower than the melting point of the material of the melt.

6. The melt of claim 5, wherein the material of the melt is copper or copper silver composite and the second material is tin.

7. Melt according to claim 1 or 2, characterized in that the first plurality of fracture zones are connected by bending zones.

8. The melt body of claim 1 or 2, further comprising at least one third fracture region disposed on a third plane protruding from the first plane, the at least one third fracture region disposed between any two adjacent first fracture regions of the plurality of first fracture regions, the third fracture region being provided with a plurality of through holes.

9. A fuse, characterized by comprising: at least one melt according to any one of claims 1-8 and a first terminal plate and a second terminal plate electrically connected to both ends of the melt.