Fuse with small projection area

Abstract

The invention provides a fuse with a small projection area. The fuse comprises an insulating shell and an insulating base, a first groove is formed in the insulating shell; the insulating base is provided with at least one first combination part, and the insulating shell is provided with at least one second combination part; the insulating base and the insulating shell are combined through the at least one first combination part and the at least one second combination part so as to cover the first groove to form an accommodating cavity; a first through hole and a second through hole are formed in the insulating base, the first electrode penetrates out of the first through hole, and the second electrode penetrates out of the second through hole; the first electrode and the second electrode are used for being connected in a protected circuit to protect a post-stage circuit; the length of the insulating shell in the first direction is at least twice of the maximum diameter of the first end face of the insulating shell and the maximum diameter of the second end face of the insulating shell; the first end face is parallel to the second end face, and the first direction is the direction from the first end face to the second end face or from the second end face to the first end face.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of emergency protection devices, and particularly relates to a fuse with a small projection area. BACKGROUND

[0002] At present, under the background of rapid development of the new energy automobile industry, efficient use of the vehicle space has been upgraded from an "optimization item" to a "core competitiveness". The underlying logic of this trend is not only derived from the direct demand of consumers for the available space (such as the passenger cabin and storage area) in the vehicle, but also cooperates with the development direction of the power battery energy density improvement and the electric drive system integration. When the vehicle cruising range breaks through the "range anxiety" threshold, the space utilization rate becomes a key indicator to measure the competitiveness of the product. In this process, the miniaturization process of the on-board charger (OBC), which is one of the core subsystems of the new energy automobile, is particularly crucial. On the one hand, the OBC undertakes the core function of converting alternating current into direct current, and the volume directly affects the layout space of the surrounding components such as the high-voltage distribution box and the battery pack. On the other hand, the improvement of the power density (unit volume output power) of the OBC can effectively reduce the energy consumption of the whole vehicle and indirectly prolong the actual cruising range. Therefore, promoting the OBC to develop in the direction of "lightweight, compact and high integration" has become the technical consensus of the entire new energy automobile industry chain.

[0003] However, in the technical research of OBC miniaturization, one easily overlooked but crucial link, the installation design of the circuit protection device (especially the fuse), is becoming a key bottleneck restricting the volume optimization. SUMMARY

[0004] The application provides a fuse with a small projection area, so as to reduce the area occupied by the fuse on the circuit board, and further reduce the size of the circuit board.

[0005] In a first aspect, the application provides a fuse with a small projection area, comprising an insulating shell and an insulating base. The insulating shell is provided with a first groove; the insulating base is provided with at least one first combining part, and the insulating shell is provided with at least one second combining part; the insulating base and the insulating shell are combined through the at least one first combining part and the at least one second combining part, so as to cover the first groove to form a containing cavity; The insulating base is provided with a first through hole and a second through hole, a first electrode is led out from the first through hole, and a second electrode is led out from the second through hole; the first electrode and the second electrode are used to be connected in the protected circuit to protect the subsequent circuit; The length of the first direction of the insulating shell is at least twice the maximum diameter of the first end face of the insulating shell and the maximum diameter of the second end face of the insulating shell; the first end face is parallel to the second end face, and the first direction is the direction from the first end face to the second end face or from the second end face to the first end face.

[0006] In combination with the first aspect, in a possible embodiment, the fuse with a small projection area further comprises an assembly, the insulating base comprises a first base plate, a first platform extends from a third end face of the first base plate, and a first fence extends from an edge of the first platform; the at least one first bonding part is arranged on the first fence; the first through hole and the second through hole both penetrate the first platform and the first base plate; the at least one second bonding part is arranged on the shell wall of the insulating shell close to one end of the first opening of the first recess; when the insulating base is combined with the insulating shell, the first platform and the first fence are inserted into the first recess, and a fourth end face of the first opening abuts against the first end face; the at least one first bonding part and the at least one second bonding part are combined and fixed by the assembly to combine the insulating base and the insulating shell.

[0007] In combination with the first aspect, in a possible embodiment, the insulating base comprises a first base plate, and the at least one first bonding part is arranged on the first base plate; the at least one second bonding part extends on a fourth end face of the first opening of the first recess of the insulating shell; the at least one second bonding part is combined with the at least one first bonding part to combine the insulating base and the insulating shell; the first through hole and the second through hole both penetrate the first base plate.

[0008] In combination with the first aspect, in a possible embodiment, the fuse with a small projection area further comprises an assembly, the insulating base comprises a first base plate; a first platform extends from a third end face of the first base plate, and a first step between the first platform and the first base plate forms the first bonding part; a second platform extends on a fourth end face of the first opening of the first recess of the insulating shell, and a second step between the second platform and the fourth end face forms the second bonding part; the first bonding part and the second bonding part are combined and fixed by the assembly to combine the insulating base and the insulating shell; the first through hole and the second through hole both penetrate the first base plate; or, At least one first bonding part is arranged at the edge of the first end face, at least one second bonding part is arranged at the edge of the fourth end face, the at least one first bonding part and the at least one second bonding part are fixedly combined by the assembly, so as to combine the insulating base and the insulating shell; the first through hole and the second through hole both penetrate the first base plate.

[0009] In combination with the first aspect, in a possible embodiment, the insulating base comprises a first base plate, a first platform extends from a third end face of the first base plate, a first fence extends from the edge of the first platform, and a first bonding part extends from the outer wall at the joint of the first platform and the first fence; the at least one second bonding part is arranged on the shell wall of the insulating shell near the first opening of the first recess; when the insulating base is combined with the insulating shell, the first platform and the first fence are inserted into the first recess, and the first bonding part is combined with the second bonding part, so as to combine the insulating base and the insulating shell; the fourth end face of the first opening abuts against the first end face.

[0010] In combination with the first aspect, in a possible embodiment, the assembly comprises a ring structure, a rectangular structure or a special-shaped structure. In combination with the first aspect, in a possible embodiment, a first penetrating cavity penetrating a sixth end face and a seventh end face of the sealing member is arranged on the sealing member; a third step is arranged on the outer wall of the first end of the insulating shell, and the edge of the first base plate is flush with the third step; the sealing member is sleeved on the third step through the first penetrating cavity, so as to fix the insulating shell and the first base plate.

[0011] In combination with the first aspect, in a possible embodiment, a second recess is arranged on the third step, and when the sealing member is sleeved on the third step, a convex part is formed on the inner wall of the first penetrating cavity through necking operation, so that the convex part is combined with the second recess, and the sealing member is fixed with the insulating shell; the necking operation refers to that when the sealing member is sleeved on the third step, a target region on the sealing member is inwardly retracted to form the convex part.

[0012] In combination with the first aspect, in a possible embodiment, a third through hole penetrating the insulating base is arranged on the insulating base, and the third through hole is used for filling arc-extinguishing material into the accommodating cavity.

[0013] With the first aspect, in a possible embodiment, a support part is arranged on the fifth end surface of the first substrate; the support part is used to separate the circuit board from the first through hole and the second through hole by a preset distance to provide a welding distance when the fuse with small projection area is welded in the protected circuit.

[0014] It can be seen that the fuse with small projection area in the application includes an insulating shell and an insulating base; the insulating shell is provided with a first groove; the insulating base is provided with at least one first combining part, and the insulating shell is provided with at least one second combining part; the insulating base and the insulating shell are combined through the at least one first combining part and the at least one second combining part to cover the first groove to form a containing cavity; the insulating base is provided with a first through hole and a second through hole, a first electrode is arranged to pass through the first through hole, and a second electrode is arranged to pass through the second through hole; the first electrode and the second electrode are used to be connected in the protected circuit to protect the subsequent circuit; the length of the first direction of the insulating shell is at least twice the maximum diameter of the first end surface of the insulating shell and the maximum diameter of the second end surface of the insulating shell; the first end surface is parallel to the second end surface, and the first direction is the direction from the first end surface to the second end surface or from the second end surface to the first end surface. In this way, the end with the smallest area in the fuse is arranged as the insulating base, and the first electrode and the second electrode are arranged on the insulating base, so that the fuse can be installed on the circuit board in a vertical installation manner, the area occupied by the fuse on the circuit board is reduced, and the size of the circuit board is further reduced; at the same time, the first combining part and the second combining part are arranged on the insulating shell and the insulating base respectively, so that the combination between the insulating shell and the insulating base is more firm. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only show some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0016] Figure 1 is a structural schematic diagram of a first fuse with small projection area provided by an embodiment of the application; Figure 2 is a structural schematic diagram of a metal conductor provided by an embodiment of the application; Figure 3 is a sectional schematic diagram of a first insulating shell and insulating base provided by an embodiment of the application; Figure 4Fig. 4 is a cross-sectional view of a second insulating shell and insulating base provided by an embodiment of the present application; Figure 5 Fig. 5 is a cross-sectional view of a third insulating shell and insulating base provided by an embodiment of the present application; Figure 6 Fig. 6 is a cross-sectional view of a fourth insulating shell and insulating base provided by an embodiment of the present application; Figure 7 Fig. 7 is a cross-sectional view of a metal conductor combined with an insulating base provided by an embodiment of the present application; Figure 8 Fig. 8 is a structural view of a sealing member provided by an embodiment of the present application; Figure 9 Fig. 9 is a structural view of a second fuse with a small projection area provided by an embodiment of the present application. DETAILED DESCRIPTION

[0017] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0018] The terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device including a series of steps or units is not limited to the listed steps or units, but can optionally include other steps or units not listed, or can optionally include other steps or units inherent to the process, method, system, product, or device.

[0019] In this document, the term "embodiment" means that the specific features, structures, or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment is referred to, nor does it mean that the embodiments are mutually exclusive or alternative to each other. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0020] At present, in the technical research of OBC miniaturization, one easily overlooked but crucial link, the installation design of circuit protection devices (especially fuses), is becoming a key bottleneck restricting volume optimization.

[0021] To solve the above problems, the embodiment of the present application provides a fuse with a small projection area. The fuse with a small projection area can be applied to the scene of circuit protection. The fuse with a small projection area in the present application includes an insulating shell and an insulating base; the insulating shell is provided with a first groove; the insulating base is provided with at least one first combining part, and the insulating shell is provided with at least one second combining part; the insulating base and the insulating shell are combined through the at least one first combining part and the at least one second combining part to cover the first groove to form a containing cavity; the insulating base is provided with a first through hole and a second through hole, a first electrode is passed out of the first through hole, and a second electrode is passed out of the second through hole; the first electrode and the second electrode are used to be connected in a protected circuit to protect a subsequent circuit; the length of a first direction of the insulating shell is at least twice the maximum diameter of a first end face of the insulating shell and the maximum diameter of a second end face of the insulating shell; the first end face is parallel to the second end face, and the first direction is the direction from the first end face to the second end face or from the second end face to the first end face. In this way, the end with the smallest area in the fuse is set as the insulating base, and the first electrode and the second electrode are arranged on the insulating base, so that the fuse can be installed on a circuit board in a vertical installation manner, the area occupied by the fuse on the circuit board is reduced, and then the size of the circuit board is reduced; at the same time, the first combining part and the second combining part are arranged on the insulating shell and the insulating base respectively, so that the combination between the insulating shell and the insulating base is more firm. The present scheme can be applied to various scenes, including but not limited to the application scenes mentioned above.

[0022] The specific structure will be described in detail below.

[0023] Please refer to Figures 1-9 The present application also provides a fuse with a small projection area 100, which includes an insulating shell 10 and an insulating base 20. The insulating shell 10 is provided with a first groove 11; the insulating base 20 is provided with at least one first combining part 21, and the insulating shell 10 is provided with at least one second combining part 12; the insulating base 20 and the insulating shell 10 are combined through the at least one first combining part 21 and the at least one second combining part 12 to cover the first groove 11 to form a containing cavity 50; The insulating base 20 is provided with a first through hole 22 and a second through hole 23, a first electrode 32 is passed out of the first through hole 22, and a second electrode 33 is passed out of the second through hole 23; the first electrode 32 and the second electrode 33 are used to be connected in a protected circuit to protect a subsequent circuit; The length of the first direction of the insulating shell 10 is at least twice the maximum diameter of the first end face of the insulating shell 10 and the maximum diameter of the second end face of the insulating shell 10; the first end face is parallel to the second end face, and the first direction is the direction from the first end face to the second end face or from the second end face to the first end face.

[0024] In a specific implementation, a composite material with 30% glass fiber added to a high-temperature-resistant engineering plastic PA66 is used to make the insulating shell 10 through an injection molding process. The insulating shell 10 has a cylindrical appearance, with one end being a closed end (the end where the second end face is located) and the other end being an open end (the end where the first opening 111 is located), and a cavity structure, i.e., the first groove 11, formed in the middle. The insulating shell 10 can have a circular, elliptical, square, or any other shape in a cross-section parallel to the first end face, and is a hollow cylindrical body with one end open. The second end face is the bottom of the sealed end of the first groove 11.

[0025] Further, an elliptical cross-section is formed on the long axis end point of the specific position of the inner wall surface of the first groove 11 at the open end of the insulating shell 10, and a first combining part 21 is formed at each end point. A through hole is formed in the groove wall of the first groove 11 above the first combining part 21 in the insulating shell 10, which is a sand filling hole for filling the arc extinguishing material of the product.

[0026] The cross-sectional size of the bottom closed end of the insulating base 20 is the same as that of the insulating shell 10, i.e., the insulating base 20 can be inserted into the first groove 11 of the insulating shell 10, and the side wall of the bottom closed end of the insulating base 20 is flush with the outer wall of the insulating shell 10.

[0027] Further, the insulating shell 10 is formed by a tubular shell including a second penetrating cavity, and the two ends of the second penetrating cavity are sealed by the first base plate 24 and the second base plate, respectively, to form the containing cavity 50 in the insulating shell 10. One side of the first base plate 24 as the cavity wall of the containing cavity 50 is the first end face, and at least one platform is extended from the first end face, so that the first base plate 24 can be combined with the tube wall of the tubular shell through the at least one platform, and the friction force can improve the combination strength of the first base plate 24 and the tubular shell.

[0028] Specifically, please refer to Figure 2The fuse 100 further comprises a metal fuse body 31 which is integrally formed with the first electrode 32 and the second electrode 33, the first electrode 32 is arranged at a first end of the metal fuse body 31, and the second electrode 33 is arranged at a second end of the metal fuse body 31; the metal fuse body 31 comprises a fusing portion 311, a first connecting portion 312 and a second connecting portion 313, the first connecting portion 312 is connected with the first end of the fusing portion 311 and the first electrode 32 respectively, and the second connecting portion 313 is connected with the second end of the fuse 100 and the second electrode 33 respectively.

[0029] Optionally, the fusing portion 311, the first electrode 32, the second electrode 33, the first connecting portion 312 and the second connecting portion 313 are integrally formed to form a metal conductor 30. The metal conductor 30 is preferably made of T2 red copper or oxygen-free copper, or other materials (not limited herein). In the manufacturing process, a metal material is first prepared into a rectangular metal sheet with a predetermined specification, and then the fusing portion 311, the first electrode 32, the second electrode 33, the first connecting portion 312 and the second connecting portion 313 are manufactured on the rectangular metal sheet by corresponding manufacturing processes based on the specifications of the components, thereby obtaining the metal conductor 30.

[0030] The shape of the metal conductor 30 is not limited, as long as the first electrode 32 and the second electrode 33 can pass through the first through hole 22 and the second through hole 23. The thickness of the fusing portion 311 is smaller than the thickness of the first connecting portion 312, the second connecting portion 313, the first electrode 32 and the second electrode 33, and the fusing portion 311 forms multiple narrow necks with small cross-sectional area at a specific position through the through hole, as the position that first fuses under abnormal current. Optionally, the projection of the first end and the second end of the fusing portion 311 on any plane does not overlap. Taking the U-shaped structure of the fusing portion 311 as an example, the narrow necks are formed on the two vertical downward arms (i.e. the first vertical arm and the second vertical arm) of the U-shaped structure, and there is a certain offset at the position on both sides to ensure that arc does not occur when arc occurs. The first electrode 32 and the second electrode 33 pass through the first through hole 22 and the second through hole 23 on the insulating base 20 and are exposed outside the fifth end surface 25 of the first substrate 24, for connecting the product to the circuit board of the protected circuit; and the first connecting portion 312 and the second connecting portion 313 are respectively inside the first through hole 22 and the second through hole 23 of the insulating base 20, for the transition connection of the fusing portion 311 and the first electrode 32 and the second electrode 33. In addition, the first connecting portion 312 extends obliquely from the first vertical arm of the fusing portion 311 to the first electrode 32 in a direction away from the second vertical arm, and then connects the first vertical arm and the first electrode 32 respectively; similarly, the second connecting portion 313 extends obliquely from the second vertical arm of the fusing portion 311 to the second electrode 33 in a direction away from the first vertical arm, and then connects the second vertical arm and the second electrode 33 respectively; in this way, the insulation distance between the first electrode 32 and the second electrode 33 is increased without changing the distance between the two arms of the fuse.

[0031] The insulating base 20 can be a multi-layer stepped structure, and the first end surface and the fifth end surface 25 of the first substrate 24 of the insulating base 20 have the same cross-sectional area as the tubular shell parallel to the first end surface and the fifth end surface 25, but the cross-sectional area of at least one platform decreases layer by layer. It can be understood that one platform, multiple platforms or no platform can be provided on the insulating base 20, which can be adjusted according to the actual production situation, and is not limited to be unique here.

[0032] Taking two layers of platforms as an example, at least one platform includes the first platform 26 and the third platform, the first platform 26 is arranged on the first substrate 24, and the third platform is arranged on the first platform 26. The size of the first end surface of the first substrate 24 is larger than the size of the first platform 26, and the size of the first platform 26 is larger than the size of the third platform.

[0033] As can be seen, in the embodiment, the first electrode 32 and the second electrode 33 are arranged at the end with the smallest area in the fuse 100, so that the fuse 100 can be installed on the circuit board in a vertical manner, the area occupied by the fuse 100 on the circuit board is reduced, and the size of the circuit board is further reduced; meanwhile, the fuse 100 takes the insulating shell 10 as the main body, various structures are obtained by processing on the insulating shell 10, and then the first electrode 32 and the second electrode 33 are connected, so that the overall size of the fuse 100 is further reduced.

[0034] In one possible embodiment, referring to Figure 3 , the fuse 100 further comprises a combination member 41, the insulating base 20 comprises a first base plate 24, a first platform 26 extends from a third end surface 27 of the first base plate 24, and a first fence 28 extends from an edge of the first platform 26; the at least one first bonding part 21 is arranged on the first fence 28; the first through hole 22 and the second through hole 23 both penetrate the first platform 26 and the first base plate 24; the at least one second bonding part 12 is arranged on a shell wall of the insulating shell 10 close to one end of a first opening 111 of the first recess 11; when the insulating base 20 is combined with the insulating shell 10, the first platform 26 and the first fence 28 are inserted into the first recess 11, and a fourth end surface of the first opening 111 abuts against the first end surface; the at least one first bonding part 21 and the at least one second bonding part 12 are combined and fixed through the combination member 41, so as to combine the insulating base 20 and the insulating shell 10.

[0035] In the embodiment, only one platform is provided, which is referred to as the first platform 26. At least one second combining part 12 is provided at a specific height of the insulating pipe body from the opening end. Meanwhile, at least one first combining part 21 is provided on the first fence 28 of the insulating base 20. The first combining part 21 can be a through hole penetrating the first fence 28, and the second combining part 12 can be a through hole penetrating the groove wall of the first groove 11. When the first platform 26 of the insulating base 20 is inserted into the first groove 11 of the insulating pipe body from the first opening 111, the two through hole openings of the first combining part 21 and the second combining part 12 coincide. In addition, a combination part 41 is prepared, which can be a columnar structure. During installation, the combination part 41 is pressed into the first combining part 21 and the second combining part 12, so that the two ends of the installed combination part 41 are flush with the outer surface of the side wall of the insulating pipe body. In this way, the insulating shell 10 and the insulating base 20 can be combined with each other and are not easy to separate, thereby improving the combination stability between the insulating shell 10 and the insulating base 20. The combination part 41 and the first combining part 21 and the second combining part 12 are in interference fit to improve the combination strength. It can be understood that in the preferred example, the combination part 41 is in interference fit with the first combining part 21 and the second combining part 12, thereby improving the combination strength between the insulating base 20 and the insulating shell 10.

[0036] It can be understood that the combination part 41 can also be a ring structure, a rectangular structure or a special-shaped structure, or other types of structures, as long as it can fix the insulating shell 10 and the insulating base 20 with the first combining part 21 and the second combining part 12.

[0037] In one possible embodiment, referring to Figure 4 , the insulating base 20 includes a first base plate 24, and the at least one first combining part 21 is provided on the first base plate 24. The at least one second combining part 12 extends from the fourth end surface of the first opening 111 of the first groove 11 of the insulating shell 10. The at least one second combining part 12 is combined with the at least one first combining part 21 to combine the insulating base 20 and the insulating shell 10. The first through hole 22 and the second through hole 23 both penetrate the first base plate 24.

[0038] In a specific implementation, the insulating base 20 can only include the first substrate 24, at least one second combining part 12 is extended from the fourth end surface of the open end of the insulating tube, at least one first combining part 21 is arranged on the first substrate 24 of the insulating base 20, and the at least one second combining part 12 is combined with the at least one first combining part 21 to combine the insulating base 20 and the insulating shell 10. The first through hole 22 and the second through hole 23 both penetrate the first substrate 24. The second combining part 12 can be columnar, wedge-shaped or other shapes, and the first combining part 21 can be a groove matched with the second combining part 12. In some cases, the shapes of the first combining part 21 and the second combining part 12 can be interchanged, for example, the first combining part 21 is columnar, wedge-shaped or other shapes, and the second combining part 12 is a groove. An interference fit is adopted between the first combining part 21 and the second combining part 12 to improve the bonding strength between the insulating base and the insulating tube. During installation, the first combining part 21 on the insulating tube is pressed into the second combining part 12 on the insulating base 20 to realize the connection of the insulating tube and the insulating base 20 and ensure that the contact surfaces of the two can be tightly combined.

[0039] In one possible embodiment, referring to Figure 5 , the fuse 100 further includes a combination part 41, the insulating base 20 includes a first substrate 24, a first platform 26 is extended from a third end surface 27 of the first substrate 24, and a first step between the first platform 26 and the first substrate 24 forms the first combining part 21; a second platform is extended from a fourth end surface of the insulating shell 10 close to a first opening 111 of the first groove 11, and a second step between the second platform and the fourth end surface forms the second combining part 12; the first combining part 21 and the second combining part 12 are combined and fixed by the combination part 41 to combine the insulating base 20 and the insulating shell 10; and the first through hole 22 and the second through hole 23 both penetrate the first substrate 24.

[0040] In a specific implementation, a first platform 26 is arranged on the insulating base 20, and a ring-shaped second platform surrounding the first opening 111 is extended from the fourth end surface of the insulating shell 10.

[0041] During installation, when the fourth end surface of the insulating tube and the first end surface of the insulating base 20 are placed at a predetermined positioning position, the edge of the first platform 26 is aligned with the edge of the second platform, at this time, the first combining part 21 and the second combining part 12 combine to form a ring-shaped positioning groove, an interference-fitted ring-shaped positioning wedge (i.e., the combination part 41) is buckled on the ring-shaped positioning groove, and finally a sealing member 60 is buckled on the outer wall of the combined part of the insulating shell 10 and the insulating base 20 to realize the connection of the insulating tube and the insulating base 20.

[0042] In another possible embodiment, at least one first bonding part 21 is arranged at the edge of the first end face, at least one second bonding part 12 is arranged at the edge of the fourth end face, and the at least one first bonding part 21 and the at least one second bonding part 12 are fixedly combined by the assembly part 41 to combine the insulating base 20 and the insulating shell 10; the first through hole 22 and the second through hole 23 both penetrate the first base plate 24.

[0043] In a specific implementation, at least one first bonding part 21 is arranged at the edge of the first base plate 24 of the insulating base 20 to form at least one first notch on the first base plate 24, which can be rectangular, circular, elliptical, wedge-shaped or other shapes, without being limited to be unique. At least one second bonding part 12 is also arranged on the insulating shell 10 to form at least one second notch on the fourth end face of the insulating shell 10, which can be rectangular, circular, elliptical, wedge-shaped or other shapes, without being limited to be unique. When the fourth end face of the insulating tube body is placed at a predetermined positioning position with the first end face of the insulating base 20 during installation, the first notch (i.e., the first bonding part 21) and the second notch (i.e., the second bonding part 12) intersect to form a positioning groove, and a positioning wedge (i.e., the assembly part 41) in interference fit is pressed into each positioning groove, and finally a sealing member 60 is buckled on the outer wall of the combined part of the insulating shell 10 and the insulating base 20 to realize the connection of the insulating tube body and the insulating base 20.

[0044] It can be understood that the assembly part 41 includes a ring structure, a rectangular structure or a special-shaped structure, or other types of structures, as long as it can fix the insulating shell 10 and the insulating base 20 with the first bonding part 21 and the second bonding part 12.

[0045] In a possible embodiment, referring to Figure 6 and Figure 7 , the insulating base 20 includes a first base plate 24, a first platform 26 extending from the third end face 27 of the first base plate 24, a first fence 28 extending from the edge of the first platform 26, and a first bonding part 21 extending from the outer wall at the joint of the first platform 26 and the first fence 28; the at least one second bonding part 12 is arranged on the shell wall of the insulating shell 10 near the first opening 111 of the first recess 11; when the insulating base 20 is combined with the insulating shell 10, the first platform 26 and the first fence 28 are inserted into the first recess 11, and the first bonding part 21 is combined with the second bonding part 12 to combine the insulating base 20 and the insulating shell 10; and the fourth end face of the first opening 111 abuts against the first end face.

[0046] In a specific implementation, a wedge-shaped protrusion is extended on the outer wall at the connection between the first platform 26 of the insulating base 20 and the first fence 28 as the first combination part 21, and a wedge-shaped recess is formed on the inner wall surface of the first recess 11 at a specific position as the second combination part 12. When the insulating base 20 is inserted into the first recess 11, the first platform 26 and the first fence 28 are inserted into the first recess 11, and the wedge-shaped protrusion is inserted into the wedge-shaped recess on the side wall of the insulating pipe body, so that the insulating base 20 is fixedly installed on the insulating pipe body. In this way, the insulating base 20 cannot move laterally in the insulating shell 10; the step between the first base plate 24 and the first platform 26 abuts against the fourth end surface, and the combination of the first combination part 21 and the second combination part 12 makes the insulating base 20 unable to move longitudinally in the insulating shell 10; and finally the insulating shell 10 and the insulating base 20 can be combined with each other and are not easy to be separated in any direction, thereby improving the combination stability between the insulating shell 10 and the insulating base 20.

[0047] In a possible embodiment, referring to Figure 8 The sealing member 60 is further provided with a first penetrating cavity 61 penetrating the sixth end surface and the seventh end surface of the sealing member 60; the outer wall of the first end of the insulating shell 10 is provided with a third step 13, and the edge of the first base plate 24 is flush with the third step 13; and the sealing member 60 is sleeved on the third step 13 through the first penetrating cavity 61 to fix the insulating shell 10 and the first base plate 24.

[0048] In a specific implementation, the sealing member 60 is buckled on the third step 13 of the insulating pipe body, and then the first base plate 24 and the insulating shell 10 are fixed; and the sealing member 60 is used to shield the third through hole 15 penetrating into the accommodating cavity 50 on the third step 13 for pouring the arc extinguishing material, so as to prevent the arc extinguishing material filled into the insulating pipe body from flowing out through the third through hole 15.

[0049] In a possible embodiment, the third step 13 is provided with a second recess 14, and when the sealing member 60 is sleeved on the third step 13, a protrusion is formed on the inner wall of the first penetrating cavity 61 through a necking operation, so that the protrusion is combined with the second recess 14 to fix the sealing member 60 and the insulating shell 10; the necking operation refers to that when the sealing member 60 is sleeved on the third step 13, a target region on the sealing member 60 is inwardly retracted to form the protrusion. The target region is a region corresponding to the second recess 14.

[0050] In a specific implementation, the sealing member 60 is sleeved on the third step 13, so that the sealing member 60 covers the second groove 14, and then the position corresponding to the second groove 14 on the sealing member 60 is extruded, so that the outer wall of the sealing member 60 is retracted into the second groove 14 to form a protruding part. Through the limiting effect of the second groove 14 on the protruding part, the risk of displacement or falling of the sealing member 60 during product vibration is prevented. Optionally, the sealing hoop is made of elastic metal material (such as beryllium bronze or stainless steel, etc.), which ensures the sealing performance and mechanical strength, and can also play the effect of electromagnetic shielding of the fuse 100.

[0051] In one possible embodiment, referring to Figure 9 , a third through hole 15 is formed in the insulating base 20 and penetrates the insulating base 20, and the third through hole 15 is used to fill arc extinguishing material into the inside of the accommodating cavity 50.

[0052] In a specific implementation, in the manufacturing process of the fuse 100, the position design of the third through hole 15 has a significant influence on the filling quality and production efficiency of the arc extinguishing material. When the third through hole 15 is arranged on the third step 13 as described in the above example, in order to ensure that the arc extinguishing material can smoothly flow into the internal cavity of the insulating shell 10 and prevent material overflow during the filling process, the fuse 100 can only be placed in a horizontal manner in the filling process, wherein vertical placement refers to a placement manner with a smaller horizontal projection area, and horizontal placement refers to a placement manner with a larger horizontal projection area. This horizontal placement manner has a particularly prominent disadvantage when the height size of the fuse 100 is large. Because when placed horizontally, the horizontal length of the fuse 100 is significantly increased, after the arc extinguishing material enters from the third through hole 15, it needs to flow through a long horizontal path to reach the other end of the fuse 100, and during this process, the arc extinguishing material will generate a large friction force with the inner wall of the insulating tube when flowing, resulting in an increase in the flow resistance of the material. At the same time, during the filling process, the arc extinguishing material is prone to accumulate in the middle, and it is difficult to be evenly distributed to the distal end of the fuse 100, so that the filling density of the arc extinguishing material at the end of the fuse 100 is difficult to guarantee, which seriously affects the arc extinguishing performance of the fuse 100. In addition, long-distance flow of the material also significantly increases the filling time, greatly reduces the production efficiency, and increases the quality risks such as material dampening and impurity mixing caused by too long filling time. As Figure 9As shown, a third through hole 15 is provided at the center of the bottom of the insulating base 20 as a sand filling hole in this embodiment. This design allows the fuse 100 to be placed vertically when filling the arc extinguishing material. After the arc extinguishing material is filled, a sand stopper is pressed into the third through hole 15, and sealing silica gel is coated on the sand stopper to increase the sealing effect and bonding strength. The vertical placement has the advantage that the arc extinguishing material can directly fall along the vertical direction under the action of gravity, thereby minimizing the bending and resistance of the material flow path and allowing the arc extinguishing material to be more efficiently filled into the internal cavity of the insulating tube. At the same time, since the material falls vertically, it can be uniformly distributed inside the tube, avoiding local accumulation or insufficient filling, thereby effectively ensuring the uniformity and stability of the filling density, significantly improving the production efficiency, and ensuring the consistency and reliability of the arc extinguishing performance of the fuse 100, thereby providing a strong guarantee for the quality of the fuse 100. Optionally, a fifth through hole can also be provided on the second substrate as a sand filling hole. Since the second substrate and the first substrate are opposite substrates, filling the arc extinguishing material through the fifth through hole can also achieve the purpose of vertical filling in this embodiment, thereby achieving the same or similar technical effects as the third through hole.

[0053] In one possible embodiment, referring to Figure 1 and Figure 9 , a support portion 29 is provided on the fifth end surface 25 of the first substrate 24; the support portion 29 is used to separate the circuit board from the first through hole 22 and the second through hole 23 by a preset distance when the fuse 100 with a small projection area is welded in the protected circuit, so as to provide a welding distance.

[0054] In a specific implementation, a preset number of support portions 29 are provided at the bottom of the insulating base 20, so that when welding, the insulating base 20 and the circuit board maintain a certain gap, so that the solder is more easily filled into the bottom of the product to wrap the entire end electrode, increase the contact area between the solder and the end electrode, reduce the contact resistance, and improve the welding quality.

[0055] It can be understood that the number of support portions 29 can be selected as needed, for example, one, two or more support portions 29 are provided according to the type of clamp, so that the fuse 100 can be isolated from the circuit board through the support portion 29, and at the same time, the stability of the fuse 100 during welding can be enhanced, and unnecessary displacement of the fuse 100 during welding can be reduced.

[0056] Although the present application is disclosed as above, the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions without departing from the spirit and scope of the present application, and various changes and modifications can be made, including combinations of different functions and implementation steps, including software and hardware implementations, all within the scope of protection of the present application.

Claims

1. A fuse having a small projected area, characterized in that, The insulation shell, the insulation base and the sealing element are combined to form a combined element. The insulation base is provided with at least one first combining part, and the insulation shell is provided with at least one second combining part; the insulation base and the insulation shell are combined through the at least one first combining part and the at least one second combining part to cover the first recess to form a containing cavity. The insulation base is provided with a first through hole and a second through hole, and the first electrode and the second electrode are used for being connected to a protected circuit to protect a subsequent circuit. The sealing element is provided with a first penetrating cavity penetrating the sixth end face and the seventh end face of the sealing element; the outer wall of the first end of the insulation shell is provided with a third step, and the edge of the insulation base is flush with the third step; the sealing element is sleeved on the third step through the first penetrating cavity to fix the insulation shell and the insulation base.

2. The fuse having a small projected area according to claim 1, characterized by, The insulation base comprises a first base plate, a first platform extending from the third end face of the first base plate, and a first fence extending from the edge of the first platform; the at least one first combining part is arranged on the first fence; the first through hole and the second through hole penetrate the first platform and the first base plate; The at least one second combining part is arranged on the shell wall of the insulation shell near the first end of the first opening of the first recess; When the insulation base is combined with the insulation shell, the first platform and the first fence are inserted into the first recess, and the fourth end face of the first opening abuts against the first end face; the at least one first combining part and the at least one second combining part are combined and fixed through the combined element to combine the insulation base and the insulation shell.

3. The fuse having a small projected area according to claim 1, characterized by, The insulation base comprises a first base plate, and the at least one first combining part is arranged on the first base plate; The at least one second combining part extends from the fourth end face of the insulation shell near the first opening of the first recess; The at least one second combining part is combined with the at least one first combining part to combine the insulation base and the insulation shell; The first through hole and the second through hole penetrate the first base plate.

4. The fuse having a small projected area according to claim 1, characterized by, The insulation base comprises a first base plate; A first platform extends from the third end face of the first base plate, and a first step between the first platform and the first base plate forms the first combining part; a second platform extends from the fourth end face of the insulation shell near the first opening of the first recess, and a second step between the second platform and the fourth end face forms the second combining part; The first combining part and the second combining part are combined and fixed through the combined element to combine the insulation base and the insulation shell; the first through hole and the second through hole penetrate the first base plate; or, At least one first bonding part is arranged at the edge of the first end face, at least one second bonding part is arranged at the edge of the fourth end face, the at least one first bonding part and the at least one second bonding part are fixedly combined by the assembly, so as to combine the insulating base and the insulating shell; the first through hole and the second through hole both penetrate the first base plate.

5. The fuse having a small projected area according to claim 1, characterized by, The insulating base comprises a first base plate, a first platform extends from a third end face of the first base plate, a first fence extends from the edge of the first platform, and a first bonding part extends from the outer wall at the joint of the first platform and the first fence; the at least one second bonding part is arranged on the shell wall of the insulating shell near the first opening of the first recess; When the insulating base is combined with the insulating shell, the first platform and the first fence are inserted into the first recess, and the first bonding part is combined with the second bonding part, so as to combine the insulating base and the insulating shell; The fourth end face of the first opening abuts against the first end face.

6. The fuse having a small projected area according to claim 2 or 4, characterized by The assembly comprises a ring structure, a rectangular structure or a special-shaped structure.

7. The fuse having a small projected area according to any one of claims 1 to 5, characterized in that The insulating shell is made of a glass fiber toughened composite material added in a high-temperature resistant engineering plastic and is made by an injection molding process according to the composite material.

8. The fuse having a small projected area according to claim 1, characterized by, A second recess is arranged on the third step, and when the sealing member is sleeved on the third step, a convex part formed on the inner wall of the first penetrating cavity by a necking operation is combined with the second recess, so as to fix the sealing member and the insulating shell; the necking operation refers to that when the sealing member is sleeved on the third step, a target area on the sealing member is inwardly retracted to form the convex part.

9. The fuse having a small projected area according to claim 1, characterized by, A third through hole penetrating the insulating base is arranged on the insulating base, and the third through hole is used for filling arc extinguishing material into the accommodating cavity.

10. A fuse having a small projected area according to any one of claims 2-5, characterized in that, A fifth end face of the first base plate is provided with a support part; the support part is used for separating a circuit board and the first through hole and the second through hole by a preset distance when the fuse with a small projection area is welded in a protected circuit, so as to provide a welding distance.

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