A fusible link structure with easy replacement of the melt

Abstract

The utility model discloses a kind of fuse structure of easy replacement melt, it is related to the technical field of fuse, including shell, wiring hole, fuse tube and porcelain seat, the outside of shell is connected with handle, the top end and bottom end of shell are all provided with wiring hole, the outside of shell is provided with clamping mechanism, the back of shell is clamped and positioned by clamping mechanism, the positioning range of clamping mechanism is adjusted according to the size of cross bar, the other side of shell is provided with dismounting mechanism, the fuse tube inside shell is laterally taken out by dismounting mechanism, and then it is convenient to not need to disassemble shell and junction, dismounting and replacing are carried out to fuse tube, the upper and lower sides of fuse tube are all provided with porcelain seat. Positioning is realized by cover plate and porcelain insert is ensured to be sealed with air switch, embedded porcelain insert or quick-insert connector is used, so that fuse incoming and outgoing line is directly connected with air switch side edge terminal post, and cable bending is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of fuses, specifically to a fuse structure with an easily replaceable fusible element. Background Technology

[0002] Fuses are widely used in high and low voltage power distribution systems, control systems, and electrical equipment as short-circuit and overcurrent protectors. When the current exceeds the rated value (such as in a short circuit or overload), the internal fusible element melts rapidly due to high temperature, cutting off the circuit and preventing equipment damage. They are one of the most commonly used protective devices.

[0003] Most existing fuses have protective functions. When internal components such as the fuse element fail, the fuse element or the entire fuse is usually replaced during the repair of the broken circuit. This requires disassembling the entire fuse body for inspection or replacement, which involves a certain amount of work and is difficult to perform. Summary of the Invention

[0004] The purpose of this invention is to provide a fuse structure with an easily replaceable fusible element, so as to solve the above-mentioned defects caused by the prior art.

[0005] A fuse structure with easily replaceable fuse element includes a housing, wiring holes, a fuse tube, and a porcelain base. A handle is connected to the outside of the housing. Wiring holes are provided at both the top and bottom of the housing. A clamping mechanism is provided on the outside of the housing to clamp and position the back of the housing. The positioning range of the clamping mechanism is adjusted according to the size of the crossbar. A disassembly mechanism is provided on the other side of the housing to remove the fuse tube inside the housing laterally, thereby facilitating the disassembly and replacement of the fuse tube without disassembling the housing and the connection. Porcelain bases are provided on both the upper and lower sides of the fuse tube.

[0006] Preferably, the clamping mechanism includes a vertical clamping bar, a guide groove seat, a rubber strip, and a return spring. The vertical clamping bar is installed inside the guide groove seat, which is located on the back of the outer casing. A rubber strip is connected to the top of the vertical clamping bar, and the top of a return spring is provided on both sides of the vertical clamping bar. The bottom of the return spring is connected to the guide groove seat.

[0007] Preferably, the outer shell is connected to the outer side of the vertical clip via guide grooves symmetrically arranged on the back.

[0008] Preferably, the disassembly mechanism includes a plastic handle, a cover plate, a ceramic insert, a hard plastic crossbar, a slot, and a fastener. The cover plate is connected to one side of the plastic handle, and the ceramic insert is provided on the other side of the cover plate. A fusible tube is provided inside the ceramic insert. The hard plastic crossbar is symmetrically arranged on one side of the cover plate, and a fastener is connected through one side of the hard plastic crossbar. The tail end of the fastener is connected to the outside of the slot. The slot is symmetrically opened on one side of the outer shell. The cover plate is fitted to one side of the outer shell, and a ceramic seat is symmetrically provided at the inner end of the ceramic insert.

[0009] Preferably, the cover plate is connected to the outside of the slot via a hard plastic crossbar on the back.

[0010] Preferably, the ceramic insert has stationary contacts at both ends, which are respectively connected to the power input line and the load output line.

[0011] Compared with the prior art, the present invention has the following advantages: 1. The ceramic insert is positioned and sealed to the air switch by using a cover plate. Embedded ceramic inserts or quick-connect connectors are used to directly connect the fuse input and output lines to the side terminals of the air switch, reducing cable bends and achieving precise positioning and reliable sealing of the ceramic insert. The ceramic insert is positioned by the cover plate. At the same time, symmetrical slots and hard plastic strips are used for connection. This improves the stability of the cover plate at the connection and ensures the sealing of the connection between the cover plate and the housing by the embedded hard plastic strips.

[0012] 2. Add a flexible clamp to the back of the air switch to facilitate easy disassembly and assembly. Set a set of embedded vertical clips (thickness ≥1.2mm) on the back of the air switch. The end of the vertical clip is designed with a barbed claw. The pressing locking mechanism enables quick engagement with the distribution box rail, which facilitates the assembly and positioning of the outer shell and the electrical box. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0014] Figure 2 This is a schematic diagram of the back structure of the outer shell in this utility model.

[0015] Figure 3 This is a schematic diagram of the internal structure of the outer shell in this utility model.

[0016] Figure 4 This is a side view of the disassembly mechanism in this utility model.

[0017] Figure 5 This is a cross-sectional view of the clamping mechanism in this utility model.

[0018] in: 1. Outer shell; 2. Handle; 3. Wiring hole; 4. Clamping mechanism; 5. Vertical locking strip; 6. Plastic handle; 7. Cover plate; 8. Disassembly mechanism; 9. Guide groove seat; 10. Rubber strip; 11. Ceramic insert; 12. Fuse tube; 13. Ceramic seat; 14. Hard plastic horizontal bar; 15. Slot; 16. Fastener; 17. Return spring. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] like Figures 1 to 5 As shown, a fuse structure with easily replaceable fuse element includes a housing 1, a wiring hole 3, a fuse tube 12, and a porcelain base 13. A handle 2 is connected to the outside of the housing 1. Wiring holes 3 are provided at the top and bottom of the housing 1. A clamping mechanism 4 is provided on the outside of the housing 1. The clamping mechanism 4 clamps and positions the back of the housing 1. The positioning range of the clamping mechanism 4 is adjusted according to the size of the crossbar. A disassembly mechanism 8 is provided on the other side of the housing 1. The disassembly mechanism 8 removes the fuse tube 12 from the inside of the housing 1 laterally, so that the fuse tube 12 can be disassembled and replaced without disassembling the housing 1 and the connection. Porcelain bases 13 are provided on both the upper and lower sides of the fuse tube 12.

[0021] In this embodiment, the clamping mechanism 4 includes a vertical clamping bar 5, a guide groove seat 9, a rubber strip 10, and a return spring 17. The vertical clamping bar 5 is installed inside the guide groove seat 9, which is located on the back of the outer shell 1. The top of the vertical clamping bar 5 is connected to the rubber strip 10. The tops of the return springs 17 are located on both sides of the vertical clamping bar 5. The bottom of the return springs 17 is connected to the guide groove seat 9. The rubber strip 10 contacts the outer side of the guide rail, increasing the clamping friction.

[0022] In this embodiment, the outer shell 1 is connected to the outer side of the vertical clip 5 through guide slot seats 9 symmetrically arranged on the back. The guide slot seats 9 provide semi-enclosed guidance to the outer side of the vertical clip 5 to prevent the vertical clip 5 from shaking or loosening.

[0023] In this embodiment, the disassembly mechanism 8 includes a plastic handle 6, a cover plate 7, a ceramic insert 11, a hard plastic crossbar 14, a slot 15, and a fastener 16. The cover plate 7 is connected to one side of the plastic handle 6, and the ceramic insert 11 is provided on the other side of the cover plate 7. A fusible tube 12 is provided inside the ceramic insert 11. The hard plastic crossbar 14 is symmetrically arranged on one side of the cover plate 7, and the fastener 16 is connected through one side of the hard plastic crossbar 14. The tail end of the fastener 16 is connected to the outside of the slot 15. The slot 15 is symmetrically opened on one side of the outer shell 1. The cover plate 7 is fitted to one side of the outer shell 1. The inner end of the ceramic insert 11 is symmetrically provided with a ceramic seat 13. The hard plastic crossbar 14 symmetrically arranged on the cover plate 7 fits into the slot 15, which facilitates the sealing and positioning of the outer side of the cover plate 7 by the fastener 16.

[0024] In this embodiment, the cover plate 7 is connected to the outside of the slot 15 via a hard plastic strip 14 on the back. The end of the hard plastic strip 14 is designed with a barbed claw, and a press-type locking mechanism is used to achieve quick engagement with the distribution box rail, thereby improving the ease of assembly of a single shell 1.

[0025] In this embodiment, the ceramic insert 11 has stationary contacts at both ends, which are respectively connected to the power input line and the load output line. The metal contact at the bottom of the ceramic insert 11 is aligned with the stationary contact of the ceramic base 13 below the fuse tube 12.

[0026] In practical applications, this type of fuse structure with easily replaceable fuse elements includes the following functions: Step 1: The operator first presses down on the hard plastic horizontal bar 14, causing the return springs 17 on both sides of the hard plastic horizontal bar 14 to deform downwards. The hard plastic horizontal bar 14 is displaced inside the guide slot seat 9, so that the outer shell 1 is aligned with the distribution box guide rail through the groove on the back. Then, the rubber strip 10 is attached to the top of the hard plastic horizontal bar 14. Then, by releasing the hard plastic horizontal bar 14, the return springs 17 are used to push the hard plastic horizontal bar 14 vertically upwards. The rubber strip 10 at the top of the hard plastic horizontal bar 14 clamps the outer side of the guide rail. At the same time, the groove at the top of the outer shell 1 clamps and positions the guide rail. Step 2: The metal contact at the bottom of the ceramic insert 11 is aligned with the stationary contact of the ceramic seat 13 on both sides of the fuse tube 12. A tight contact is achieved through spring pressure. The two ends of the fuse (made of lead-tin alloy) are fixed in the groove of the moving contact of the ceramic insert 11. When it needs to be replaced, disconnect the main power supply of the power distribution system before operation. Use a 10kV tester to confirm that there is no residual voltage at both ends of the fuse. First, loosen the fastener 16 so that the fastener 16 is loosened from the inside of the slot 15, so that the hard plastic strip 14 on the outside of the cover plate 7 is separated from the slot 15. Step 3: Disassemble the inlet and outlet terminal bolts counterclockwise, check the burn area of ​​the contact surface, and the operator holds the plastic handle 6 to separate the cover plate 7 from the outer shell 1. Remove the fuse tube 12 and the porcelain base 13 from the inside of the outer shell 1. Rotate the fuse tube 12 counterclockwise by 45° to release the internal energy storage spring, release the fixing buckle, separate the porcelain plug 11 from the support bracket, and apply force through the insulating rod (vertical pulling force ≤80N) to smoothly pull out the fuse tube 12 along the axial direction. Step 4: Then remove the new fuse tube 12, straighten the fuse wire (lead-tin alloy) and insert it into the groove of the ceramic insert 11. Apply a pre-tightening force of 3-5N. The insertion angle of the fuse tube 12 is aligned with the axis of the base. The arc suppression cover faces away from the conductor. Manually operate 3 times to confirm that the opening and closing of the circuit is smooth. Then attach the cover plate 7 to one side of the outer shell 1 again, so that the hard plastic strip 14 is attached to the inside of the slot 15. Secure and seal the cover plate 7 and the outer shell 1 with fasteners 16.

[0027] Therefore, the above-disclosed embodiments are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. A fuse structure with an easily replaceable fusible element, characterized in that: The device includes a housing (1), wiring holes (3), a fuse tube (12), and a ceramic base (13). A handle (2) is connected to the outside of the housing (1). Wiring holes (3) are provided at the top and bottom of the housing (1). A clamping mechanism (4) is provided on the outside of the housing (1). The clamping mechanism (4) clamps and positions the back of the housing (1). The positioning range of the clamping mechanism (4) is adjusted according to the size of the crossbar. A disassembly mechanism (8) is provided on the other side of the housing (1). The disassembly mechanism (8) removes the fuse tube (12) provided inside the housing (1) laterally, so that the fuse tube (12) can be disassembled and replaced without disassembling the housing (1) and the connection. A ceramic base (13) is provided on both the upper and lower sides of the fuse tube (12).

2. The fuse structure with easily replaceable fusible element according to claim 1, characterized in that: The clamping mechanism (4) includes a vertical clamping bar (5), a guide groove seat (9), a rubber strip (10), and a return spring (17). The vertical clamping bar (5) is installed inside the guide groove seat (9), which is located on the back of the outer shell (1). The top of the vertical clamping bar (5) is connected to the rubber strip (10), and the tops of the return springs (17) are provided on both sides of the vertical clamping bar (5). The bottom of the return springs (17) is connected to the guide groove seat (9).

3. The fuse structure with an easily replaceable fusible element according to claim 2, characterized in that: The outer shell (1) is connected to the outside of the vertical clip (5) through guide slots (9) symmetrically arranged on the back.

4. The fuse structure with easily replaceable fusible element according to claim 1, characterized in that: The disassembly mechanism (8) includes a plastic handle (6), a cover plate (7), a ceramic insert (11), a hard plastic crossbar (14), a slot (15), and a fastener (16). The plastic handle (6) is connected to the cover plate (7) on one side, and the ceramic insert (11) is provided on the other side of the cover plate (7). The ceramic insert (11) is provided with a fuse tube (12). The hard plastic crossbar (14) is symmetrically arranged on one side of the cover plate (7). The fastener (16) is connected through one side of the hard plastic crossbar (14). The tail end of the fastener (16) is connected to the outside of the slot (15). The slot (15) is symmetrically opened on one side of the outer shell (1). The cover plate (7) is fitted to one side of the outer shell (1). The inner end of the ceramic insert (11) is symmetrically provided with a ceramic seat (13).

5. The fuse structure with easily replaceable fusible element according to claim 4, characterized in that: The cover plate (7) is connected to the outside of the slot (15) via a hard plastic crossbar (14) provided on the back.

6. The fuse structure with easily replaceable fusible element according to claim 4, characterized in that: The ceramic insert (11) has stationary contacts at both ends, which are respectively connected to the power input line and the load output line.

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