CN218631889U

CN218631889U - Combined fuse

Info

Publication number: CN218631889U
Application number: CN202223248038.XU
Authority: CN
Inventors: 吴晓翠; 宋晓
Original assignee: Xian Zhongrong Electric Co Ltd
Current assignee: Xian Zhongrong Electric Co Ltd
Priority date: 2022-12-05
Filing date: 2022-12-05
Publication date: 2023-03-14
Anticipated expiration: 2032-12-05

Abstract

The invention relates to the field of circuit protection of electric power, electronic circuits and the like, in particular to a combined fuse, which comprises a splicing shell, wherein at least two independent cavities are formed in the shell, melts with different current specifications are arranged in each independent cavity, two ends of each melt are respectively connected with a wiring terminal, and the wiring terminals penetrate through the shell and are positioned outside the shell; the shell tightly presses and fixes the wiring terminal and seals the contact surface; and arc extinguishing media are filled in each independent cavity. The combined fuse is simple in structure, convenient to process and manufacture, integrated in a shell and convenient to wire. The integrated combined fuse is small in size, can fully utilize limited space in a vehicle, is easy to maintain at a later stage, and saves cost. The combined fuse is provided with a through hole for installation, so that the combined fuse can be conveniently installed and fixed.

Description

Combined fuse

Technical Field

The invention relates to a fuse for protecting circuits in the industries of electric power, electronic circuits and the like, in particular to a vehicular fuse.

Background

In circuit protection in the industries of electric power, electronic circuits and the like, fuses are connected in series in a circuit to protect circuit breaking. With the development of new energy vehicles in recent years, fuses are also increasingly used in the new energy vehicles in large quantities. For the vehicle fuse, the fuses with different specifications often need to be integrated in a control box, and the occupied space is large, and the installation space in the vehicle is limited, so that the occupied space of various fuses needs to be reduced. Chinese patent CN217114303U discloses a multi-cavity fuse structure, which is also developed by the present applicant, and adopts a housing to form a plurality of cavities through partition plates, and a melt is disposed in each cavity and filled with an arc extinguishing medium, because both ends of the fuse structure have only one connecting terminal, which is essentially a fuse. Although the multi-cavity is adopted in the shell in the technical scheme, the total volume of the shell is not changed, and the technical problem to be solved is that a plurality of melts of the same specification are isolated by the plurality of cavities, and abnormal arcing and further fuse breaking failure caused by abnormal arcing or large arc columns generated when the plurality of melts are fused are avoided. The technical scheme of the patent can not be applied to multi-path circuit protection and can not realize integration of different fuses of a plurality of specifications so as to reduce the technical problem of occupied space.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a combined fuse, which integrates melts with various specifications into a shell with a plurality of independent cavities, and the specifications of the melts in each cavity are different, so that the space occupied by fuses with different specifications is reduced, and the production cost is reduced.

In order to solve the technical problems, the technical scheme provided by the invention is that the combined fuse comprises a spliced shell, at least two independent cavities are formed in the shell, melts with different current specifications are arranged in each cavity, two ends of each melt are respectively connected with a connecting terminal, and the connecting terminals penetrate through the shell and are positioned outside the shell; the shell is used for tightly pressing and fixing the wiring terminal and sealing the contact surface; and arc extinguishing media are filled in each independent cavity.

Preferably, the housing comprises a housing body and a housing cover which can be spliced with each other, and at least two independent accommodating grooves are arranged in the housing body; when the shell and the shell cover are spliced, each accommodating groove forms one independent cavity.

Preferably, the butting surfaces of the shell and the shell cover at the two ends of the independent cavity are provided with butting concave-convex structures, the wiring terminals are respectively and tightly pressed and fixed between the butting concave-convex structures, and the wiring terminals positioned between the concave-convex structures are provided with positioning structures.

Preferably, the positioning structure is a positioning notch respectively formed in opposite positions of two sides of the wiring terminal, and the positioning notch is clamped on two sides of the notch of the concave-convex structure.

Preferably, two adjacent accommodating grooves are separated by a spacer rib, and the height of the spacer rib is lower than the surface of the shell; a boss with the same shape as the inner cavity of the shell is arranged on the inner surface of the shell cover, and the boss protrudes out of the inner surface of the shell cover; when the shell cover is butted on the shell body, the lug boss is contacted with the separating rib to seal the accommodating groove.

Preferably, the distance between the height of the spacer ribs and the surface of the shell is the same as the distance between the boss and the inner surface of the shell cover, and the distance is not more than 0.5mm.

Preferably, one set of opposite corners of the shell and the shell cover are fixedly connected through screws, and the other set of opposite corners of the shell and the shell cover are fixedly connected through buckles.

Preferably, through holes are respectively arranged at four corners of the shell and the shell cover, nuts are embedded in the through holes at one group of opposite corners of the shell, a clamping hook is arranged on the outer side surface of one side of the other group of opposite corners, and a buckle is arranged at the position of the shell cover corresponding to the clamping hook; the buckle is buckled on the hook, and the opposite angles of the shell and the shell cover which are embedded with the nuts are connected through screws. Preferably, one end of the melt shares one of the terminals.

Preferably, a sand filling hole is respectively arranged at the position of the shell corresponding to each cavity.

According to the combined fuse, the plurality of cavities separated by the partition ribs are integrated in the shell, and the melts with different current specifications are respectively arranged in the cavities to form the plurality of integrated fuses, so that the combined fuse occupies a small space; the shell and the shell cover are integrally formed through injection molding respectively and are butted through the concave-convex structure to fix the melt and the wiring terminal, so that the structure is simple, the processing is convenient, and the assembly and processing cost is reduced; the wiring is convenient, and a plurality of groups of circuits can be protected at the same time; because the mounting hole is reserved on the shell, the installation is convenient and the maintenance is convenient.

Drawings

Fig. 1 is a schematic diagram of the explosive structure of example 1.

FIG. 2 is a schematic view of the structure of the case cover of embodiment 1.

Figure 3 is a schematic view of the combined fuse structure after the housing and the cover are butted.

Fig. 4 is a schematic diagram of the explosive structure of example 2.

FIG. 5 is a schematic view showing the structure of the case cover of embodiment 2.

Detailed Description

With respect to the above technical solutions, preferred embodiments are described in detail with reference to the drawings.

The combined fuse comprises a shell and a plurality of groups of melt wiring terminal assemblies 2 which are spliced, wherein a plurality of groups of independent cavities are integrated in the shell, a group of melt wiring terminal assemblies 2 are arranged in each cavity, and the shell formed by splicing is used for fixing the melt wiring terminal assemblies 2 and sealing the contact surface. The following is a description of a specific structure of the composite fuse.

Example 1

Referring to fig. 1 to 3, the housing is formed by abutting a housing body 1 and a housing cover 3. The shell 1 and the shell cover 3 are both made of high-temperature-resistant thermosetting materials through injection molding. Nuts 11 are embedded in one group of opposite corners of the shell 1, and through holes 14 are formed in the other group of opposite corners. And grooves are respectively formed in the outer side surfaces of one group of opposite angles provided with the through holes 14, and clamping hooks 15 are arranged in the grooves.

A plurality of containing grooves 16 used for containing the melt 21 are formed in the shell 1, two adjacent containing grooves 16 are separated by a partition rib 13, the thickness of the partition rib is not less than 2mm, and the height of the partition rib is 0.5mm lower than the surface of the shell 1. A notch 12 is respectively formed on the wall of the housing 1 at the opposite sides of each accommodating groove 16.

Referring to fig. 1 and 2, the housing cover 3 is provided with V-shaped counter bores 31 at four corners thereof, wherein one group of diagonal V-shaped counter bores 31 correspond to the nuts 11 of the housing 1, the housing cover can be fixed on the housing 1 by passing screws 4 through the V-shaped counter bores 31 and the nuts 11, and the screws 4 are countersunk screws; the other group of the diagonal V-shaped counter bores 31 correspond to the through holes 14 of the shell 1, and the V-shaped counter bores 31 are combined with the through holes 14 to be used for installing and connecting holes when the fuse is installed. The buckle 33 is arranged on the outer side face of one side of a group of opposite angles corresponding to the through hole 14, the buckle 33 corresponds to the position of the hook 15 on the shell 1, and when the shell cover 3 covers the shell 1, the buckle 33 can be buckled on the hook 15 to realize the connection and fixation of the shell cover and the group of opposite angles of the shell. The cover 3 is provided with projections 32 on both sides relative to the recess 12 of the housing 1. A boss 34 which is consistent with the shape of the inner cavity of the shell 1 and is not higher than 0.5mm is arranged on the inner surface of the shell cover 3. The shell cover 3 is provided with sand filling holes 35 corresponding to the middle positions of the accommodating grooves 16, the sand filling holes 35 are sealed through plugs 5, and the sand filling holes 35 are used for filling arc extinguishing media.

When the cover 3 is butted on the housing 1, the convex part 32 is clamped at the notch 12 to form a concave-convex structure. A clearance is left at the interface of the boss 32 and the recess 12 for the terminal 22 to pass through. The boss 34 on the case cover 3 presses on the spacer 13 on the case body 1 to close the receiving groove 16 to form an independent cavity.

The melt terminal assembly 2, see fig. 1, is formed by welding a melt 21 and terminals 22 at both ends of the melt 21. A plurality of equidistant fusing parts 211 are arranged on the melt 21, positioning parts 221 are arranged on the wiring terminals 22, and the positioning parts 221 are positioning notches arranged on two opposite sides of the wiring terminals 22. The surface of the terminal 22 corresponding to each melt 21 is imprinted with current specification size indicia 222, such as 20A, 32A, 50A, for distinguishing melt specifications.

In fig. 1, three melt terminal assemblies 2 are used, one melt terminal assembly 2 is placed in each of the accommodating grooves 16 of the housing 1, and the positioning notches of the positioning portions 221 of the terminals 22 are clamped at two sides of the notches 12 at two ends of the accommodating groove 16 where the positioning notches are located, so that the melt terminal assemblies 2 are positioned in the housing 1.

After assembly, referring to fig. 3, firstly, a melt terminal assembly 2 is placed in each accommodating groove 16 of the housing 1, so that the melt 21 is located in the accommodating groove 16, the terminal 2 is located outside the housing 1, the positioning notch of the positioning portion 221 at the terminal 2 is clamped at two sides of the notch 12, then the housing cover 3 is covered, the boss 32 on the housing cover 3 is arranged on the corresponding notch 12 to press the terminal 22, and the contact surface is sealed, at this time, the boss 34 on the housing cover 3 is attached and pressed on the separating rib 13 in the housing 1, and each accommodating groove 16 in the inner cavity of the housing 1 is sealed through the boss 34, so that the housing 1 forms independent cavities without mutual interference. After the shell cover 3 covers the shell 1, two opposite corners provided with the buckles are clamped on the outer side surface of the shell 1 through the buckle, and the other pair of opposite corners pass through the V-shaped counter bore 31 through the countersunk head screws 4 and are fixedly connected with the shell cover 3 in the shell 1 through the embedded nuts 11.

As shown in fig. 2, the positioning portions 221 of the connection terminals 22 are clamped in the notches 12 at two sides of the casing 1, after the three groups of melt connection terminal assemblies 2 are accommodated in the casing 1, the protruding portions 32 at two sides of the casing cover 3 press the positioning portions 221 of the connection terminals 22, the bosses 34 of the casing cover 3 are attached to the spacing ribs 13 of the casing 1, the casing cover 3 is connected with the embedded nuts 11 of the casing 1 by using screws 4, the screws 4 are countersunk screws, opposite corners at the other side are fastened by using buckles, arc extinguishing media are respectively filled into each cavity through the plug holes 35 of the casing cover 3, and after compaction, the cavities are sealed by using plugs 5. The through hole 14 of the shell cover 3 and the shell 1 is a position of an external mounting hole. After assembly, arc extinguishing media are respectively filled in each cavity through the sand filling holes 35, curing treatment is carried out when curing treatment is needed, and finally the sand filling holes 35 are blocked through plugs.

The combined fuse with the structure integrates a plurality of independent cavities in the shell, and the cavities are separated by the separating ribs. The occupied space of the fuse is reduced to the maximum extent. Because space restriction, the overall dimension of casing is less, under the condition of guaranteeing creepage distance and electric clearance, three group's fuse-link terminal subassembly 2 are kept apart to the spacer 13 of casing 1, form three independent fuse-links, according to electric current specification size during the use, the actual binding post that selects to correspond carries out the wiring can. Because the through holes are reserved at a group of opposite angles of the shell and the shell cover, the combined fuse can be conveniently installed and fixed.

Compared with the prior fuse structures with different specifications, the combined fuse structure has the following advantages: the combined fuse has a simple structure, is convenient to process and manufacture, integrates the required fuse into one shell, and is convenient to wire. The integrated combined fuse is small in size, can fully utilize the limited space in a vehicle, is easy to maintain at the later stage, and saves the cost. The combined fuse is provided with a through hole for installation, so that the combined fuse can be conveniently installed and fixed.

Example 2

In embodiment 1, the number of the terminals outside the housing is large and occupies a large space, as the respective corresponding terminals are used in each melt terminal assembly 2. To further reduce space usage, in this embodiment, the melt terminal assemblies 2 at one end of the housing share a single terminal 22, and the other end of the housing is a separate terminal 22. Referring to fig. 4 and 5, a common connection terminal 23 of the connection terminal of one of the melt connection terminal assemblies 2 is adopted, the connection terminal is not arranged at the same end of the other melt connection terminal assemblies 2, and one end of the melt 21 without the connection terminal is conductively connected with the melt with the connection terminal through a conductive connecting piece 24. Correspondingly, a notch 25 for accommodating the conductive connecting piece 24 is formed on the spacer 13 of the housing 1 at a position corresponding to the conductive connecting piece 24. Corresponding pressing blocks 26 are arranged on the shell cover 3 at the positions corresponding to the notches 25 on the spacing ribs 13. A corresponding one of the recesses 12 is provided on the side wall of the housing 1 corresponding to the common terminal 23, and a corresponding one of the projections 32 is provided at a position corresponding to the cover 3 of the recess 12.

When the shell cover 3 is arranged on the shell 1 in a butt joint mode, the pressing block 26 presses the gap 25 on the separating rib 13 to press the conductive connecting piece 24 and seal the gap 25, and therefore the accommodating groove forms an independent cavity.

The other end of the melt terminal assembly 2 is provided with a corresponding independent terminal 22, and each independent terminal is provided with a current specification mark 222. The other structure is the same as that of embodiment 1, and the assembling method is the same as that of embodiment 1.

One end of the combined fuse in the embodiment 2 adopts a shared wiring terminal, so that compared with the embodiment 1, the combined fuse saves more space and saves the production cost. When the circuit is accessed, the independent wiring terminal marked with one end with the current specification is accessed into the corresponding circuit according to the selection, so that one-way or multi-way circuit protection is realized.

Claims

1. A combined fuse is characterized by comprising a housing capable of being spliced, wherein at least two independent cavities are formed in the housing, melts with different current specifications are arranged in each cavity, two ends of each melt are respectively connected with a connecting terminal, and the connecting terminals penetrate through the housing and are positioned outside the housing; the shell tightly presses and fixes the wiring terminal and seals the contact surface; and arc extinguishing media are filled in each independent cavity.

2. A combination fuse as defined in claim 1, wherein the housing comprises a case body and a case cover which are joined to each other, at least two independent receiving recesses being provided in the case body; when the shell and the shell cover are spliced, each accommodating groove forms one independent cavity.

3. The combination fuse of claim 2, wherein the mating surfaces of the housing and the housing cover at the two ends of the independent cavity are formed into a concave-convex structure capable of mating, the terminals are respectively pressed and fixed between the mating concave-convex structures, and a positioning structure is provided at the terminals between the concave-convex structures.

4. A combination fuse according to claim 3, wherein the positioning structure is a positioning notch formed at opposite positions on both sides of the terminal, and the positioning notch is engaged with both sides of the recess of the concave-convex structure.

5. The combination fuse of claim 2, wherein two adjacent receiving recesses are separated by a spacer rib, and the height of the spacer rib is lower than the surface of the housing; a boss with the same shape as the inner cavity of the shell is arranged on the inner surface of the shell cover, and the boss protrudes out of the inner surface of the shell cover; when the shell cover is butted on the shell body, the lug boss is contacted with the separating rib to seal the accommodating groove.

6. A combination fuse according to claim 5, wherein the height of the spacer is less than the surface of the housing by the same distance as the distance by which the boss projects from the inner surface of the housing cover, and is not more than 0.5mm.

7. A combination fuse according to claim 2, characterised in that one set of opposite corners of the housing and housing cover are secured by a screw connection and the other set of corners are secured by a snap connection.

8. The combination fuse of claim 7, wherein through holes are respectively formed at four corners of the housing and the housing cover, nuts are embedded in the through holes at one set of opposite corners of the housing, hooks are arranged on the outer side surface of one side of the other set of opposite corners, and a buckle is arranged at a position of the housing cover corresponding to the hooks; the buckle is buckled on the hook, and the opposite angles of the shell and the shell cover which are embedded with the nuts are connected through screws.

9. A combination fuse as claimed in any of claims 1 to 8, wherein one of said terminals is common to one end of said fuse element.

10. A combination fuse according to claim 1, wherein a sand-pouring hole is provided in the housing at each of the cavities, respectively.