Fuse

Abstract

The utility model relates to a fuse, which comprises a fuse body arranged in a fuse shell, end faces arranged at two ends of the fuse shell, a contact knife arranged on each end face, two ends of the fuse body connected to the contact knives, a cover plate covered and connected on each end face, and at least two inlaying grooves concavely arranged on the peripheral outer wall between the two end faces of the fuse shell, the inlaying grooves are circumferentially arranged around the outer wall of the fuse shell, the cover plate of each end face is coated and wrapped with a sealing material, the sealing material simultaneously extends to cover the inlaying groove closest to the sealing material, the tail end of the contact knife protrudes out of the sealing material layer, and the inlaying grooves are filled with the sealing material. Therefore, the connection surfaces between the sealing material and the surfaces of the fuse shell and the cover plate are provided with embedded parts, so that the connection tightness between the sealing material and the fuse shell and the cover plate is improved, and the good sealing performance of the fuse is ensured.

Description

Technical Field

[0001] This utility model relates to the field of circuit protection technology, and more specifically to a fuse. Background Technology

[0002] A fuse is an electrical device that breaks the circuit by melting its fusible element when the current exceeds a specified value, thus protecting the circuit itself. A fuse mainly consists of a fusible element, a fuse tube, and external arc-quenching filler. A traditional low-voltage fuse generally includes a fusible element, an insulating shell, arc-quenching filler, a cover plate, and contacts. The fusible element is placed inside the insulating shell, and the cover plate assembles and fixes both ends of the shell. The two ends of the fusible element can be welded to the contacts, for example, to the contact pads. The contact pads are fixed to the cover plate, which closes the shell. The end of the contact can form a handle extending outside the cover plate (the handle can be vertically mounted on the contact pad).

[0003] In the fields of energy storage and new energy vehicles, fuses are inevitably used, such as in battery packs as circuit protection components. Traditional methods for cooling battery packs include air cooling and cold-plate liquid cooling. With technological advancements, to further reduce cooling efficiency, battery pack cooling methods are gradually shifting towards immersion liquid cooling. Immersion liquid cooling uses an insulating coolant with a flash point typically between 180°C and 250°C.

[0004] Because fuses consist of multiple components such as an insulating shell, cover plate, and contacts, and are connected and secured using screws, it is difficult to achieve a complete seal between these components and in the screw gaps. Figure 1 Taking the housing 10' of an existing fuse 100' as an example, the two end faces 1' of the fuse housing 10' are flat (only the edges are shown in the figure). The two end faces 1' are provided with screw holes for screws 4' to enter and lock the cover plate 3' onto the end face 1' to close the end face 1'. The end of the contact blade 2' protrudes from the cover plate 3'. Since the screw connection cannot achieve a completely tight fit and seal, it is difficult to avoid the situation where external gas or liquid seeps into the fuse housing 10' through the gaps in the screws and cover plate. Therefore, when fuses are used for circuit protection in battery packs with immersion liquid cooling, the immersion coolant will slowly seep into the quartz sand inside the fuse as the usage time increases. When a short circuit current occurs, an electric arc will be generated inside the fuse at the moment of disconnection. The arc temperature can reach several thousand degrees. At this time, since the flash point of the insulating liquid is 180°C to 250°C, it will ignite instantly under the action of the arc, generating a strong pressure. This pressure will cause the fuse shell to be unable to withstand the pressure and burst, thus creating a dangerous situation.

[0005] Therefore, part of the existing fuse adopts sealing material (such as silica gel and other insulating materials) to fill and cover the sealing of the possible gap on the outer surface of the fuse after the structure of the fusible body, the fuse shell, the cover plate, the contact blade and the like are assembled into a complete fuse, but due to the different materials of the sealing material and the fuse shell, the sealing material has the risk of being separated from the fuse shell under stress, especially when the fuse is broken, the arc will be generated in the shell, thereby the high pressure gas is diffused to the gap between the two sides of the fuse and the cover plate and the fuse shell, which affects the sealing effect between the sealing material and the fuse and may cause the sealing material to fall off. Practical new type content

[0006] The purpose of the present application is to provide a fuse with good sealing performance.

[0007] To achieve the above purpose, the solution of the present application is as follows:

[0008] A fuse, comprising a fusible body arranged in the interior of a fuse shell, the fuse shell having end faces at both ends, a contact blade arranged on each end face, both ends of the fusible body being connected to the contact blade, and a cover plate being arranged on each end face and connected thereto, characterized in that at least two inlaid grooves are arranged on the outer wall around the end faces of the fuse shell, the inlaid grooves being arranged circumferentially around the outer wall of the fuse shell, the cover plate of each end face being coated with and wrapped by a sealing material, the sealing material extending and covering to the nearest inlaid groove, the end of the contact blade protruding out of the sealing material layer, and the inlaid grooves being filled with the sealing material.

[0009] Further, one inlaid groove is arranged in the fuse shell near each end face, and the sealing material is tightly wrapped on each end face and the outer wall of the fuse shell between each end face and the nearest inlaid groove.

[0010] Further, the sealing material is tightly wrapped on the end faces of the entire fuse shell and the outer wall of the fuse shell, and the sealing material forms an integral whole wrapped on the outside of the fuse shell.

[0011] Further, the surfaces of the fuse shell, the cover plate, the contact blade and the sealing material are roughened to form rough surfaces.

[0012] Further, the rough surfaces include rough patterns formed by sandblasting, polishing or wire drawing.

[0013] Further, the sealing material is a special plastic material resistant to high temperature and corrosion.

[0014] Further, the sealing material is high-temperature nylon or PPS or PET or PBT.

[0015] After the above scheme, since the assembly parts of the fuse are concentrated between the fuse shell end face and the cover plate, the contact blade and other components, gaps are easy to exist, therefore, the utility model utilizes the sealing material to completely seal the joint of each part of the fuse and the screw gap through the sealing process, ensures the insulation performance and sealing performance of the fuse, and improves the high temperature resistance and moisture resistance of the fuse, in addition to the ordinary application scene, it can also adapt to complex working environment, such as the protection of the battery pack used in the full immersion type liquid cooling in the background art, the cooling liquid will not enter the inside of the fuse. In addition, the utility model only the contact blade end protrudes from the sealing material for wire installation, and the fuse shell is provided with an inlay groove, the sealing material fills the inlay groove, enhances the close connection relationship between the sealing material and the fuse shell, avoids the risk of falling of the sealing material caused by the diffusion of high pressure gas to the gap between the two sides of the fuse and the cover plate and the porcelain tube when the fuse is broken.

[0016] Further, roughening treatment is performed on the surface of the contact sealing material of the fuse, which can improve the bonding performance between the sealing material and the fuse, and avoid the falling of the sealing material. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic view of the existing fuse structure.

[0018] Figure 2 It is a structure schematic view of the first embodiment of the utility model without wrapping the sealing material.

[0019] Figure 3 It is a structure schematic view of the first embodiment of the utility model wrapping the sealing material.

[0020] Figure 4 It is a cross-sectional schematic view of the first embodiment.

[0021] Figure 5 It is a structure schematic view of the second embodiment of the utility model.

[0022] BRIEF DESCRIPTION OF DRAWINGS

[0023] 100' fuse; 10' shell; 1' end face; 2' contact blade; 21' mounting hole; 3' cover plate; 4' screw;

[0024] 100 fuse; 10 fuse shell; 101 inlay groove; 1 end face; 2 contact blade; 3 cover plate; 4 screw; 5 sealing material. DETAILED DESCRIPTION

[0025] In order to further explain the technical scheme of the utility model, the utility model will be described in detail through specific embodiments.

[0026] The utility model discloses a fuse 100, including being equipped with the fuse body (not shown in drawing) in the fuse shell 10 inside, the fuse shell 10 both ends have end face 1, be equipped with the contact blade 2 on each end face 1, the both ends of fuse body are connected to the contact blade 2, each end face 1 still cover and be connected with the cover plate 3. The utility model's improvement lies in, recessed at least two inlaying grooves 101 between the four peripheral walls of the end face 1 of the fuse shell 10, the inlaying groove 101 is set up in the circumference of the outer wall of the fuse shell 10, forms a ring groove, the cover plate 3 on each end face 1 is coated and tightly wrapped with sealing material 5, sealing material 5 extends and covers simultaneously to the inlaying groove 101 closest to it, so that a sealable end cover body can be formed on both ends of the fuse shell 10 respectively, the contact blade 2 end protrudes from the sealing material 5 layer, the sealing material 5 fills the inlaying groove 101, so that the sealing material can be embedded in the inlaying groove 101, and the sealing material can be better held on the fuse shell 10.

[0027] Reference Figures 2-4 For the first embodiment of the utility model discloses a fuse 100, the embodiment is equipped with two inlaying grooves 101 on the four peripheral walls between the end face 1 of the fuse shell 10, specifically, one inlaying groove 101 is set up in the fuse shell 10 respectively near the position of the end face 1, and the sealing material 5 is tightly wrapped on each end face 1 and the outer wall of the fuse shell 10 between each end face 1 and the inlaying groove 101 closest to it.

[0028] When the sealing material 5 is wrapped on the surface of the fuse shell 10, the mold or jig can be used to receive the sealing material on the outside of the fuse shell 10, so that the end cover plate 3 of the fuse 100 and the inlaying groove 101 closest to the cover plate 3 are immersed in the liquid sealing material 5. The liquid or flowable sealing material 5 completely coats and wraps the cover plate 3 of the end face of the fuse shell and fills the inlaying groove 101. After the sealing material 5 solidifies, the mold is removed, and the sealing material forms a whole wrapped on the outside of the fuse shell, sealing the surface of the fuse shell 10 and the cover plate 3. Because the sealing material fills the entire inlaying groove 101, the connection surface between the sealing material 5 and the surface of the fuse shell 10 and the cover plate 3 has an inlaying part, which improves the connection tightness between the two, thereby ensuring the insulation performance and sealing performance of the fuse 100, and avoiding the risk of the sealing material 5 falling off due to the diffusion of high-pressure gas generated during the breaking of the fuse 100 to the gap between the two sides of the fuse 100 and the cover plate 3 and the porcelain tube. According to the above principle, the inlaying groove 101 of the utility model can be opened in multiple ways or in different forms according to the specific implementation, as long as it can improve the overall connection tightness after being filled with sealing material 5.

[0029] In the embodiment, to improve the bonding performance of the sealing material 5 and the fuse 100, the surfaces of the fuse housing 10, the cover plate 3, the contact blade 2 and the sealing material 5 are roughened to be rough surfaces, the contact area with the sealing material 5 is increased, and the mechanical bonding force is improved. The roughening treatment can include sandblasting, polishing, wire drawing and the like, so that the surfaces of the fuse housing 10, the cover plate 3, the contact blade 2 and the sealing material 5 are roughened to form rough patterns by the steps of sandblasting, polishing, wire drawing and the like.

[0030] In the embodiment, the sealing material 5 is a special plastic material with high temperature resistance and corrosion resistance, for example, high temperature nylon, PPS, PET, PBT and the like.

[0031] Referring to Figure 5 For the second embodiment of the utility model, the difference between the embodiment and the first embodiment is that, in the embodiment, the two end surfaces 1 of the fuse housing 10 and the outer wall of the fuse housing 10 are tightly wrapped with a layer of sealing material 5, the sealing material 5 forms a whole to wrap the outside of the fuse housing, and the whole fuse 100 (except the part of the contact blade 2 outside the end reserved for connecting the wire) is wrapped in the sealing material 5, so that the overall sealing performance of the fuse 100 is further improved compared with the first embodiment.

[0032] The above is only one embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A fuse comprising a fuse body provided inside a fuse housing, the fuse housing having end faces at both ends thereof, each end face being provided with a contact blade, both ends of the fuse body being connected to the contact blades, and a cover being further provided on each end face and connected to the cover plate, characterized in that: At least two inlaid grooves are recessed on the peripheral wall between the two end faces of the fuse housing, the inlaid grooves are arranged circumferentially around the outer wall of the fuse housing, the cover plate of each end face is coated and wrapped with sealing material, the sealing material simultaneously extends and covers the nearest inlaid groove, the end of the contact blade protrudes out of the sealing material layer, and the sealing material fills the inlaid groove. ​ 2. A fuse according to claim 1, characterized in that: An inlaid groove is arranged in the fuse housing near each end face, and the sealing material tightly wraps each end face and the outer wall of the fuse housing between each end face and the nearest inlaid groove.

3. A fuse according to claim 1, wherein: The two end faces of the entire fuse housing and the outer wall of the fuse housing are tightly wrapped with sealing material, and the sealing material forms an integral whole wrapped outside the fuse housing.

4. A fuse according to claim 2 or 3, characterised in that: The surfaces of the fuse housing, the cover plate, the contact blade and the sealing material are roughened to form rough surfaces.

5. A fuse according to claim 4, characterised in that: The rough surface includes rough patterns formed by sandblasting, polishing or wire drawing.

6. A fuse according to claim 4, wherein: The sealing material is high-temperature nylon or PPS or PET or PBT.

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