A fuse

Abstract

The utility model provides a kind of fuse, comprising: fuse body, insulating base;Fuse body includes shell, fuse body, two cover plates, two connecting end, fuse body is set in shell interior, and connecting end is connected in the both ends of fuse body, two cover plates are respectively covered in the both ends of shell, connecting end is connected outside circuit by passing through cover plate, and the edge of two cover plates is correspondingly equipped with fixed sheet, and fixed sheet is bent towards shell side surface and extends a distance along shell side surface;The both ends of insulating base are equipped with the positioning portion that is protruded towards fuse body direction, and positioning groove is equipped on positioning portion, each fixed sheet is inserted into positioning groove and is fixedly connected one to one, and the part between two positioning portions of insulating base is installation part, and installation screw hole is equipped on installation part.

Description

Technical Field

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

[0002] In power systems and large electrical equipment, large-size fuses, due to their large size, weight, and high current carrying capacity, have stringent requirements for insulation and installation stability. Traditional large-size fuses, directly installed in the circuit, have the following drawbacks: 1. Potential insulation hazards: The ceramic housing used in general fuses is at risk of being broken down by current, which can easily form a leakage path with the installation carrier, threatening equipment safety; 2. Easy to loosen during installation: When existing large-size fuses are installed in the equipment circuit, they are only fixed to the copper busbars on both sides of the circuit through the connection terminals at both ends. During equipment operation, the connection terminals and copper busbars are directly stressed. Due to the large weight of the fuse itself, it may vibrate and shift during equipment operation, affecting the connection at the stress points of the fuse, resulting in poor contact and reduced protection reliability. 3. Large installation space required: Due to the large size and high current carrying capacity of large-size fuses, a certain distance must be maintained between them and other electrical components in the equipment to avoid safety hazards caused by leakage current. Therefore, a large safety distance needs to be reserved in the equipment's circuit structure, resulting in insufficient internal space and a larger overall size of the equipment. Utility Model Content

[0003] The purpose of this invention is to provide a fuse with a robust structure that has good insulation performance and installation stability, enabling the circuit to operate safely and efficiently while maintaining a compact overall structure.

[0004] To achieve the above objectives, this utility model provides a fuse, comprising: a fuse body and an insulating base; The fuse body includes a housing, a fusible element, two cover plates, and two connecting terminals. The fusible element is located inside the housing, and the two ends of the fusible element are connected to the connecting terminals. The two cover plates cover the two ends of the housing respectively. The connecting terminals pass through the cover plates and connect to the external circuit. The edges of the two cover plates are provided with corresponding fixing pieces. The fixing pieces are bent toward the side of the housing and extend along the side of the housing for a certain distance. The insulating base has positioning parts that protrude towards the fuse body at both ends. The positioning parts have positioning grooves, and each fixing piece is inserted into the positioning groove to be fixedly connected. The part of the insulating base between the two positioning parts is the mounting part, and the mounting part has mounting screw holes.

[0005] Furthermore, there is a gap between the mounting part and the side of the housing, and the side of the mounting part away from the fuse body is a plane.

[0006] Furthermore, an anti-slip insulating pad is provided on the side of the mounting part away from the fuse body.

[0007] Furthermore, the insulating base is made of high-strength, high-insulation composite material.

[0008] Furthermore, the fixing piece is L-shaped and integrally formed with the cover plate. The part of the fixing piece that is bent from the edge of the cover plate toward the side of the housing is parallel to the side of the housing and inserted into the positioning groove.

[0009] Furthermore, the positioning groove has a corresponding flat surface for fitting the fixing piece, and the positioning part and the fixing piece have corresponding screw holes, and the screws lock the fixing piece in the positioning groove.

[0010] Furthermore, the fuse body also includes an indicator and a micro switch. The indicator is located on the side of the housing that is not connected to the insulating base, and the micro switch is located on the outer wall of the side of the housing corresponding to the indicator. The two ends of the micro switch are respectively connected to the cover plates at both ends of the housing.

[0011] Furthermore, each of the two cover plates is provided with a corresponding connecting piece for connecting the end of the micro switch. One end of the connecting piece is parallel to the cover plate and fixed to the cover plate, while the other end is bent toward the side of the housing and connected to the end of the micro switch parallel to the side of the housing.

[0012] Furthermore, the cover plate is annular, with the connecting end protruding from the middle of the cover plate, and the cover plate is fixed to the housing by screws.

[0013] Furthermore, an insulating gasket is provided between the cover plate and the housing.

[0014] With the above solution, when the fuse of this utility model is installed in the equipment circuit, it is fixed in the circuit and connected to other electrical components through the mounting part of the insulating base. The insulating properties of the insulating base itself can further improve the insulation effect of the fuse and enhance the safety of circuit operation. In addition, the insulating base itself can play a connecting and fixing role. When the fuse is installed in the circuit, it is not only fixed by the connecting terminals at both ends, but also avoids the phenomenon of fuse displacement or loosening caused by equipment vibration, thus improving the installation stability of the fuse and ensuring circuit safety. Furthermore, the design of the insulating base raises the fuse body, increasing the creepage distance of the fuse, thereby improving the insulation effect. With the improvement of the insulation effect, the safety distance between the fuse and other electrical components can be reduced, making the circuit structure more compact and the equipment size further reduced.

[0015] This utility model features a fixing plate on the cover plate for fixing the insulating base, ensuring the connection stability between the insulating base and the fuse body. The fixing plate is located in the positioning groove, and the connection structure is relatively compact, preventing the fuse from having a large volume. Attached Figure Description

[0016] Figure 1 This is a perspective view (a) of the present utility model.

[0017] Figure 2 This is a perspective view (II) of the present utility model.

[0018] Figure 3 This is a top view of the present invention.

[0019] Figure 4 for Figure 3 A cross-sectional view along GG (melt not shown).

[0020] Figure 5 This is an exploded view of the present invention.

[0021] Explanation of icon numbers: 1. Shell; 2. Melt; 3. Cover plate; 31. Fixing piece; 32. Connecting piece; 4. Connecting end caps; 5 indicators; 6 micro switches; 7. Sealing gaskets; 8. Insulating base; 81. Positioning part; 811. Positioning groove; 82. Mounting part; 821. Mounting screw hole. Detailed Implementation

[0022] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0023] See Figures 1-5 This utility model provides a fuse, including: a fuse body and an insulating base 8.

[0024] The fuse body of this embodiment includes a housing 1, a fuse element 2, two cover plates 3, and two connecting ends 4. The fuse element 2 is disposed inside the housing 1, and the two ends of the fuse element 2 are connected to the connecting ends 4. The two cover plates 3 respectively cover the two ends of the housing 1. The connecting ends 4 pass through the cover plates 3 and connect to the external circuit. The edges of the two cover plates 3 are provided with L-shaped fixing pieces 31 corresponding to each other. The fixing pieces 31 are integrally formed with the cover plates 3, and the fixing pieces 31 are bent toward the side of the housing 1 and extend along the side of the housing 1 for a certain distance. The part of the fixing pieces 31 extending along the side of the housing 1 is parallel to the side of the housing 1.

[0025] The insulating base 8 has positioning parts 81 protruding towards the fuse body at both ends. The positioning parts 81 have positioning grooves 811. The positioning grooves 811 have corresponding planes that fit the fixing pieces 31. The parts of each fixing piece 31 parallel to the side of the housing 1 are inserted into the positioning grooves 811. The positioning parts 81 and the fixing pieces 31 have corresponding screw holes. The screws pass through the screw holes to lock the fixing pieces 31 in the positioning grooves 811, so as to form a fixed connection between the insulating base 8 and the fuse body.

[0026] A bent fixing piece 31 is designed on the cover plate 3 to fix the insulating base 8, ensuring the connection stability between the insulating base 8 and the fuse body. The fixing piece 31 is located in the positioning groove 811, and the connection structure is relatively compact. Therefore, the design of the insulating base 8 can not only improve the overall performance of the fuse and the connection firmness, but also prevent the fuse from having a large volume.

[0027] The portion of the insulating base 8 between the two positioning parts 81 is the mounting part 82. There is a gap between the mounting part 82 and the side of the housing 1. The mounting part 82 is provided with mounting screw holes 821 for fixing the fuse in the external circuit. When the insulating base 8 is fixed to the external circuit, the surface of the mounting part 82 away from the fuse body is attached to the mounting point of the external circuit and connected to the external circuit by bolts. In this embodiment, the side of the mounting part 82 away from the fuse body is a flat surface for easy placement. An anti-slip insulating pad can also be provided on this side of the mounting part 82 away from the fuse body to further improve the installation stability of the fuse. The gap between the mounting part 82 and the side of the housing 1 means that, based on the mounting part 82, the positioning part 81 of the insulating base 8 is raised upwards, serving to support and elevate the fuse body. In other embodiments, the space between the mounting part 82 and the housing 1 may be filled with insulating material without gaps. The insulating base 8 itself has the function of raising the fuse body. The gaps can reduce the material and weight of the insulating base. The reason why the positioning part 81 is convex upward is that when the mounting part 82 is bolted in the circuit, the bolts can be prevented from directly contacting the surface of the housing 1.

[0028] The insulating base 8 has insulating properties and a certain mechanical strength. It is made of high-strength, high-insulation composite materials, such as epoxy glass fiber board, glass fiber reinforced phenolic resin, and bulk molding compound DMC.

[0029] Preferably, in this embodiment, the fuse body, housing 1, is made of a high-temperature, arc-resistant ceramic-metal composite material, which can withstand the thermal shock and arc erosion during high current switching, providing reliable protection for internal components.

[0030] The cover plate 3 is annular, and the connecting end 4 protrudes from the middle of the cover plate 3. The cover plate 3 is fixed to the housing 1 by screws, and an insulating sealing gasket 7 is provided between the cover plate 3 and the housing 1. Specifically, the cover plate 3 and the housing 1 have corresponding screw holes at their ends, and the sealing gasket 7 also has corresponding screw holes. The cover plate 3 and the sealing gasket 7 are tightly screwed to the ends of the housing 1. The sealing gasket 7 is also made of insulating material to prevent impurities from entering the fuse body and to improve the overall sealing and insulation performance.

[0031] In this embodiment, the connection terminal 4 is made of a large-section silver-plated copper alloy, which can reduce contact resistance and is suitable for the high-current transmission requirements of the fuse operating environment in this embodiment. One end of the connection terminal 4 extends into the housing 1 and is welded to the fuse 2, while the other end protrudes from the notch in the middle of the annular cover plate 3 for electrical connection with external circuits.

[0032] In this embodiment, the fuse 2 is made of high-purity silver alloy. In different embodiments, the cross-sectional area and length of the fuse 2 can be precisely designed according to the rated current, so that the fuse can quickly melt and cut off the faulty circuit when encountering overload or short circuit.

[0033] The fuse body in this embodiment also includes an indicator 5 and a micro switch 6. The indicator 5 is located on the side of the housing 1 that is not connected to the insulating base 8. The micro switch 6 is located on the outer wall of the side of the housing 1, corresponding to the indicator 5. The two ends of the micro switch 6 are respectively connected to the cover plates 3 at both ends of the housing 1. Specifically, each of the two cover plates 3 is also provided with a connecting piece 32 corresponding to the end of the micro switch 6. One end of the connecting piece 32 is parallel to the cover plate 3 and fixed to the cover plate 3, and the other end is bent toward the side of the housing 1 and connected to the end of the micro switch 6 parallel to the side of the housing 1.

[0034] The indicator 5 is a built-in elastic trigger component, which is installed on the housing 1 and is linked to the internal molten metal 2. In the normal state of the molten metal 2, the indicator 5 is in a compressed state supported by the molten metal 2. After the molten metal 2 melts, the elastic component rebounds and triggers the indicator to act (such as the color mark popping out or the contact being connected), providing feedback on the melting status of the fuse.

[0035] The micro switch 6 is an external indicator 5 used for display. Its indication is based on the indicator 5 and is linked with the indicator 5. When the indicator 5 is activated, it triggers the micro switch 6 to output a signal, which facilitates remote monitoring or centralized alarm and is suitable for automated operation and maintenance needs.

[0036] The structures of the aforementioned indicator 5 and micro switch 6 are existing technologies, and therefore will not be described in detail here.

[0037] In this embodiment, when the fuse is installed in the equipment circuit, it is fixed in the circuit by the insulating base 8. The insulating properties of the insulating base 8 itself can further improve the insulation effect of the fuse and improve the safety of circuit operation. In addition, when the fuse is installed in the circuit, the connection terminals 4 at both ends only need to serve the function of electrical conduction. The insulating base 8 itself can serve the function of connection and fixation, thereby fixing the entire fuse. This can prevent the connection terminals 4 of the fuse from shifting or loosening due to equipment vibration, thus improving the installation stability of the fuse and ensuring circuit safety. Furthermore, the design of the insulating base 8 (especially the design of the mounting part 82 protruding outward relative to the positioning part 81) elevates the fuse body, increasing the creepage distance of the fuse and thus improving the insulation effect. With the improved insulation effect, the safety distance between the fuse and other electrical components can be reduced, making the circuit structure more compact and the equipment size further reduced. The circuit can operate safely and efficiently even with a relatively compact overall structure.

[0038] The above is merely one embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fuse, characterized in that, include: Fuse body and insulating base; The fuse body includes a housing, a fusible element, two cover plates, and two connecting terminals. The fusible element is located inside the housing, and the two ends of the fusible element are connected to the connecting terminals. The two cover plates cover the two ends of the housing respectively. The connecting terminals pass through the cover plates and connect to the external circuit. The edges of the two cover plates are provided with corresponding fixing pieces. The fixing pieces are bent toward the side of the housing and extend along the side of the housing for a certain distance. The insulating base has positioning parts that protrude towards the fuse body at both ends. The positioning parts have positioning grooves, and each fixing piece is inserted into the positioning groove to be fixedly connected. The part of the insulating base between the two positioning parts is the mounting part, and the mounting part has mounting screw holes.

2. A fuse according to claim 1, wherein There is a gap between the mounting part and the side of the housing, and the side of the mounting part away from the fuse body is flat.

3. A fuse according to claim 1 or 2, characterised in that An anti-slip insulating pad is provided on the side of the mounting part away from the fuse body.

4. A fuse according to claim 1 or 2, characterised in that The insulating base is made of high-strength, high-insulation composite material.

5. A fuse according to claim 1 or 2, characterised in that The fixing piece is L-shaped and integrally formed with the cover plate. The part of the fixing piece that is bent from the edge of the cover plate toward the side of the housing is parallel to the side of the housing and inserted into the positioning groove.

6. A fuse according to claim 5, wherein The positioning groove has a corresponding flat surface for fitting the fixing piece, and the positioning part and the fixing piece have corresponding screw holes. The screw locks the fixing piece in the positioning groove.

7. A fuse according to claim 1 or 2, characterised in that The fuse body also includes an indicator and a micro switch. The indicator is located on the side of the housing that is not connected to the insulating base. The micro switch is located on the outer wall of the housing side, corresponding to the indicator. The two ends of the micro switch are respectively connected to the cover plates at both ends of the housing.

8. A fuse according to claim 7, wherein Each of the two cover plates is also provided with a corresponding connecting piece for connecting the end of the micro switch. One end of the connecting piece is parallel to the cover plate and fixed on the cover plate, while the other end is bent toward the side of the housing and connected to the end of the micro switch parallel to the side of the housing.

9. A fuse according to claim 1 or 2, wherein The cover plate is ring-shaped, and the connecting end protrudes from the middle of the cover plate. The cover plate is fixed to the housing by screws.

10. A fuse according to claim 1 or 2, wherein An insulating gasket is provided between the cover plate and the housing.

Images