Switch type fuse and fuse base

Abstract

The invention relates to the technical field of fuses, and discloses a switch type fuse and a fuse base, the switch type fuse comprises a shell, the shell is provided with a power connection mechanism and a plurality of fuse tube assemblies, and the fuse tube assembly located at the foremost side is connected with the power connection mechanism; the power connection mechanism comprises two fuse tube connecting pieces symmetrically arranged in the shell, the fuse tube assembly comprises a fuse tube, the two ends of the fuse tube are provided with second wiring terminals, the two second wiring terminals are movably inserted into the two fuse tube connecting pieces respectively, a sliding seat is arranged in the shell in a sliding mode, and the sliding seat is connected with the fuse tube connecting pieces in a sliding mode. The two second wiring terminals are connected with the sliding seat through first connecting assemblies; the sliding seat located on the rearmost side is elastically connected with the shell through a first spring. According to the switch type fuse and the fuse base, after the fuse tube in the fuse is fused due to line protection, the fused fuse tube is automatically dismounted, and the standby fuse tube is automatically mounted, so that the circuit is timely recovered to be electrified.

Description

Technical Field

[0001] The present invention relates to the technical field of fuses, specifically to a switch-type fuse and a fuse base. Background Art

[0002] A fuse refers to an electrical appliance that, when the current exceeds a specified value, melts the fuse element with the heat generated by itself to disconnect the circuit. A fuse is based on the principle that after the current exceeds the specified value for a period of time, it melts the fuse element with the heat generated by itself, thereby disconnecting the circuit. A current protection device made using this principle. Fuses are widely used in high- and low-voltage power distribution systems, control systems, and electrical equipment. As short-circuit and over-current protectors, they are one of the most commonly used protection devices.

[0003] In the prior art, when the fuse tube of a fuse melts due to line protection, it needs to be manually replaced. This process requires disassembling the fuse base and then manually operating to replace it. It is not only rather cumbersome and has safety risks, but also before the fuse tube is manually replaced, the circuit is in a power-off state, and a long circuit interruption time will cause great inconvenience to production.

[0004] Therefore, in order to solve the above technical problems existing in the prior art, a switch-type fuse and a fuse base are proposed. Summary of the Invention

[0005] The present invention provides a switch-type fuse and a fuse base, which have the beneficial effect of automatically removing the melted fuse tube inside the fuse and automatically installing a spare fuse tube after the fuse tube melts due to line protection, thereby promptly restoring the circuit power supply. This solves the problem mentioned in the above background art that in the prior art, when the fuse tube of a fuse melts due to line protection, it needs to be manually replaced. This process requires disassembling the fuse base and then manually operating to replace it. It is not only rather cumbersome and has safety risks, but also before the fuse tube is manually replaced, the circuit is in a power-off state, and a long circuit interruption time will cause great inconvenience to production.

[0006] The present invention provides the following technical solution: A switch-type fuse includes a housing, on which a power connection mechanism and several fuse tube assemblies are provided, and the fuse tube assembly at the frontmost side is connected to the power connection mechanism; The power connection mechanism includes two fuse tube connectors symmetrically arranged inside the housing. The fuse tube assembly includes a fuse tube, and second wiring terminals are provided at both ends of the fuse tube. The two second wiring terminals are respectively movably inserted into the two fuse tube connectors. A sliding seat is slidably arranged inside the housing, and the two second wiring terminals are both connected to the sliding seat through a first connection assembly; The slide seat located at the rearmost side is elastically connected to the housing through a first spring. When the fuse tube located at the foremost side fuses, several fuse tube assemblies are pushed forward by the first spring, so as to push the fused fuse tube assembly out of the housing and replace the fuse tube assembly located at the sub-foremost side to be connected to the power connection mechanism.

[0007] As an alternative embodiment of the switch-type fuse of the present invention, wherein: both of the two fuse tube connectors are slidably connected within the housing, and the two fuse tube connectors are elastically connected to the housing through two second springs respectively. Two first connection terminals are provided on the housing, and the two first connection terminals are connected to the two fuse tube connectors through two wires respectively.

[0008] As an alternative embodiment of the switch-type fuse of the present invention, wherein: the first connection assembly includes two chutes symmetrically opened on the slide seat. Slide bars are slidably arranged within the two chutes, and the two slide bars are connected to the two second connection terminals through two second connection assemblies respectively. The two slide bars are elastically connected through a third spring; The third spring is in a state of storing elastic potential energy. When the fuse tube fuses, the third spring pushes the two slide bars in a direction away from each other.

[0009] As an alternative embodiment of the switch-type fuse of the present invention, wherein: the second connection assembly includes a first rotating rod rotatably arranged on the slide bar. The first rotating rod is elastically connected to the slide bar through a first torsion spring. A rotating seat is arranged on the first rotating rod, and the second connection terminal is connected to the rotating seat.

[0010] As an alternative embodiment of the switch-type fuse of the present invention, wherein: the second connection assembly further includes a connection seat and a fourth spring. The connection seat is arranged on the rotating seat, and two ends of the fourth spring are arranged on the slide seat and the connection seat respectively; The fourth spring is in a state of storing elastic potential energy. When the fuse tube fuses, the fourth spring located on the left drives the second connection terminal on the left to rotate counterclockwise to disengage from the fuse tube connector on the left, and the fourth spring located on the right drives the second connection terminal on the right to rotate clockwise to disengage from the fuse tube connector on the right.

[0011] As an alternative embodiment of the switch-type fuse according to the present invention, wherein: the fuse tube assembly further includes two third connection components symmetrically disposed within the housing, the third connection component includes a second rotating rod rotatably disposed on the sliding rod, the second rotating rod is elastically connected to the sliding rod by a second torsion spring, a buckle is disposed on the second rotating rod, a slot is formed on the second wiring terminal, and the buckle is movably clamped within the slot.

[0012] As an alternative embodiment of the switch-type fuse according to the present invention, wherein: a communicating rotating slot and a limiting slot are formed on the second rotating rod, the first rotating rod is rotatably connected within the rotating slot, a first limiting block is disposed on the first rotating rod, and the first limiting block is slidably connected within the limiting slot; When the fuse tube is blown, the buckle on the left side rotates counterclockwise along with the first rotating rod on the left side and disengages from the slot on the left side, and the buckle on the right side rotates clockwise along with the first rotating rod on the right side and disengages from the slot on the right side.

[0013] As an alternative embodiment of the switch-type fuse according to the present invention, wherein: a second limiting block is disposed on the second rotating rod, two limiting mechanisms are symmetrically disposed within the housing, the limiting mechanism includes a limiting rod, and the second limiting block is slidably connected on the limiting rod.

[0014] As an alternative embodiment of the switch-type fuse according to the present invention, wherein: a third rotating rod is rotatably disposed within the housing, the limiting rod is disposed on the third rotating rod, the third rotating rod is elastically connected to the housing by a third torsion spring, and a spring piece is further disposed on the housing.

[0015] The present invention further provides the following technical solution: a fuse base, applicable to a switch-type fuse, the fuse base includes a current protector main body.

[0016] The present invention has the following beneficial effects: 1. For the switch-type fuse and the fuse base, multiple fuse tube assemblies for line protection are provided as spares within the device, similar to a magazine in a charged state. When the fuse tube in the use state is blown due to a short circuit or overload of a line fault, it will cause multiple groups of spare fuse tube assemblies to move, eject the blown fuse tube assembly, and make the next group of fuse tube assemblies reach the working position, so that the power connection mechanism is reconnected to the fuse tube assembly, and the line is connected. It realizes the function of automatically and timely restoring the circuit operation without manual replacement. Especially for some important lines and usage scenarios where it is not convenient to immediately send workers for maintenance, it can reduce the inconvenience caused to production due to long-term interruption of the line.

[0017] 2. For the switch-type fuse and fuse base, when the fuse tube assembly is in the normal position, the circuit is connected by two fuse tube connectors, two second wiring terminals, and the fuse tube. Between the fuse tube connector and the fuse tube assembly, in addition to the snap connection of the second wiring terminal and the fuse tube connector, an additional set of snap structures is provided to reinforce the two, making the circuit stable.

[0018] 3. For the switch-type fuse and fuse base, after the fuse tube fuses, multiple springs and torsion spring structures in the fuse tube assembly work successively. First, the two sections of the fuse tube carry the two fuse tube connectors and separate to make way for the backup fuse tube assembly at the rear. Then, the two second wiring terminals are subjected to the thrust of the backup fuse tube assembly at the rear and the force of their own rotation, and the snap structure is unlocked, causing the second wiring terminal to disengage from the fuse tube connector. When the next fuse tube assembly arrives, a new snap structure is reconnected. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the first overall structural schematic diagram of the present invention.

[0020] Figure 2 It is the second overall structural schematic diagram of the present invention.

[0021] Figure 3 It is the first cross-sectional structural schematic diagram of the whole of the present invention.

[0022] Figure 4 For the present invention Figure 3 It is the partial enlarged structural schematic diagram at position A in the present invention.

[0023] Figure 5 For the present invention Figure 4 It is the partial enlarged structural schematic diagram at position B in the present invention.

[0024] Figure 6 It is the second cross-sectional structural schematic diagram of the whole of the present invention.

[0025] Figure 7 For the present invention Figure 6 It is the partial enlarged structural schematic diagram at position C in the present invention.

[0026] Figure 8 It is the structural schematic diagram of the power connection mechanism and the fuse tube assembly in the present invention.

[0027] Figure 9 It is the exploded structural schematic diagram of the fuse tube assembly in the present invention.

[0028] Figure 10 It is the exploded structural schematic diagram of the third connection component in the present invention.

[0029] Figure 11 It is the structural schematic diagram of the current protector main body in the present invention.

[0030] In the figure: 100, housing; 200, power connection mechanism; 210, fuse tube connector; 220, second spring; 230, first terminal; 240, wire; 300, fuse tube assembly; 310, fuse tube; 320, second terminal; 330, sliding seat; 340, first connection assembly; 341, chute; 342, sliding rod; 343, third spring; 350, second connection assembly; 351, first rotating rod; 352, first torsion spring; 353, rotating seat; 354, connecting seat; 355, fourth spring; 360, third connection assembly; 361, second rotating rod; 362, buckle; 363, clamping groove; 364, rotating groove; 365, limiting groove; 366, first limiting block; 367, second torsion spring; 370, second limiting block; 400, limiting mechanism; 410, limiting rod; 420, third rotating rod; 430, third torsion spring; 440, spring piece; 500, first spring; 600, main body of current protector. Specific embodiments

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Embodiment 1, please refer to Figures 1 - 11 , a switch-type fuse and a fuse base, including a housing 100, a power connection mechanism 200 and a plurality of fuse tube assemblies 300 are arranged on the housing 100, and the fuse tube assembly 300 located at the frontmost side is connected to the power connection mechanism 200.

[0033] The power connection mechanism 200 includes two fuse tube connectors 210 symmetrically arranged in the housing 100. The fuse tube assembly 300 includes a fuse tube 310. Second terminals 320 are arranged at both ends of the fuse tube 310. The two second terminals 320 are respectively inserted into the two fuse tube connectors 210 movably. A sliding seat 330 is slidably arranged in the housing 100. The two second terminals 320 are both connected to the sliding seat 330 through a first connection assembly 340.

[0034] The sliding seat 330 located at the rearmost side is elastically connected to the housing 100 through a first spring 500. When the fuse tube 310 located at the frontmost side is fused, a plurality of fuse tube assemblies 300 are pushed forward through the first spring 500, so as to push the fused fuse tube assembly 300 out of the housing 100 and replace the connection between the fuse tube assembly 300 located at the second frontmost side and the power connection mechanism 200.

[0035] Both fuse tube connectors 210 are slidably connected within the housing 100. The two fuse tube connectors 210 are elastically connected to the housing 100 through two second springs 220 respectively. Two first terminal blocks 230 are provided on the housing 100, and the two first terminal blocks 230 are connected to the two fuse tube connectors 210 through two wires 240 respectively.

[0036] The fuse base includes a current protector body 600.

[0037] In this embodiment: The current protector body 600 can be a switch-type fuse of the HR11 model, which is improved on the basis of a conventional fuse. The housing 100 is installed within the current protector body 600. The current of the working circuit flows in from the first terminal block 230 on the left, passes through the wire 240 on the left, the fuse tube connector 210 on the left, the second terminal block 320 on the left, the fuse tube 310, the second terminal block 320 on the right, the fuse tube connector 210 on the right, the wire 240 on the right, and reaches the first terminal block 230 on the right and then flows out.

[0038] When a line fault such as a short circuit or overload occurs, the fuse tube 310 for line protection will melt, and the specific melting point of the fuse tube 310 can be determined by selecting different materials according to the line requirements. Inside the housing 100, in addition to the fuse tube assembly 300 in the working state, there are several spare fuse tube assemblies 300 at the rear side thereof.

[0039] The first spring 500 is in a compressed state. When the fuse tube 310 at the foremost side melts, several sliding seats 330 at the rear side will be pushed forward by the elastic force released by the first spring 500, pushing the scrapped fuse tube assembly 300 out of the opening at the front side of the housing 100. A high-temperature resistant recovery tank can be installed at the front side of the housing 100 to receive the fuse tube assembly 300 at the foremost side. Then the first spring 500 continues to push a fuse tube assembly 300 at the second foremost side to reach the working position, and this fuse tube 310 is then connected to the two fuse tube connectors 210, enabling the line to automatically resume power supply.

[0040] Embodiment 2 is an improved description based on Embodiment 1. Specifically, please refer to Figures 1 - 9 , the first connection assembly 340 includes two sliding grooves 341 symmetrically opened on the sliding seat 330. Slide bars 342 are slidably arranged within the two sliding grooves 341. The two slide bars 342 are connected to the two second terminal blocks 320 through two second connection assemblies 350 respectively, and the two slide bars 342 are elastically connected through a third spring 343.

[0041] The third spring 343 is in a state of storing elastic potential energy. When the fuse tube 310 melts, the third spring 343 pushes the two slide bars 342 in the direction away from each other.

[0042] In this embodiment: When the fuse tube 310 is normally connected, the two fuse tube connectors 210 are not subject to external forces. At this time, the two second terminal blocks 320 are respectively inserted into the two fuse tube connectors 210, and the two fuse tube connectors 210 block a plurality of fuse tube assemblies 300 located at the rear side.

[0043] The third spring 343 is in a compressed state. After the fuse tube 310 located at the foremost side fuses into two sections, the elastic force of the third spring 343 is released, causing the slide bar 342 on the left side to drive the fuse tube connector 210 on the left side to move leftward, and the slide bar 342 on the right side to drive the fuse tube connector 210 on the right side to move rightward.

[0044] At this time, a plurality of fuse tube assemblies 300 located at the rear side are no longer blocked by the two fuse tube connectors 210. The first spring 500 will push the plurality of fuse tube assemblies 300 forward, first pushing the two second terminal blocks 320 located at the foremost side out of the two fuse tube connectors 210 respectively. At this time, the two fuse tube connectors 210 will reset under the elastic force of the two second springs 220. Then it pushes the slide seat 330 and the fuse tube assembly 300 located at the foremost side to move forward as a whole. Until when the slide seat 330 located at the second foremost side reaches the working position, the two fuse tube connectors 210 reset and exactly clamp the two second terminal blocks 320 located at the second foremost side, completing a new circuit connection.

[0045] Embodiment Three. This embodiment is an improved description based on Embodiment Two. Specifically, please refer to Figures 1 - 10 , the second connection assembly 350 includes a first rotating rod 351 rotatably arranged on the slide bar 342. The first rotating rod 351 is elastically connected to the slide bar 342 through a first torsion spring 352. A rotating seat 353 is arranged on the first rotating rod 351, and the second terminal block 320 is connected to the rotating seat 353.

[0046] The second connection assembly 350 further includes a connection seat 354 and a fourth spring 355. The connection seat 354 is arranged on the rotating seat 353. The two ends of the fourth spring 355 are respectively arranged on the slide seat 330 and the connection seat 354.

[0047] The fourth spring 355 is in a state of storing elastic potential energy. When the fuse tube 310 fuses, the fourth spring 355 on the left side drives the second terminal block 320 on the left side to rotate counterclockwise and disengage from the fuse tube connector 210 on the left side, and the fourth spring 355 on the right side drives the second terminal block 320 on the right side to rotate clockwise and disengage from the fuse tube connector 210 on the right side.

[0048] In this embodiment: Considering that the design only relies on the forward thrust to push the two second connection terminals 320 out of the two fuse tube connectors 210. It may be necessary to make the clamping between the two fuse tube connectors 210 and the two second connection terminals 320 relatively loose, but this will result in an insecure line connection. If the clamping between the two fuse tube connectors 210 and the two second connection terminals 320 is relatively tight, it may not be possible to smoothly push out the two second connection terminals 320 only by the forward thrust.

[0049] Therefore, two sets of second connection components 350 are also provided. The fourth spring 355 is in a stretched state. When the fuse tube 310 is intact, the whole device is in Figure 8 the state where the fuse tube 310 is horizontal.

[0050] Taking the set of second connection components 350 on the left side as an example. After the fuse tube 310 is blown, the left turntable 353 is pulled counterclockwise by the left fourth spring 355. At this time, the left half of the second connection terminal 320 will be simultaneously subjected to a forward thrust and a counterclockwise rotational force, so as to disengage from the left fuse tube connector 210. After disengaging, the second connection terminal 320 and the first rotating rod 351 will reset under the elastic force of the first torsion spring 352. The set of second connection components 350 on the right side is the same.

[0051] Embodiment 4 is an improved description based on Embodiment 3. Specifically, please refer to Figures 1 - 10 , the fuse tube assembly 300 further includes two third connection components 360 symmetrically arranged in the housing 100. The third connection component 360 includes a second rotating rod 361 rotatably arranged on the sliding rod 342. The second rotating rod 361 is elastically connected to the sliding rod 342 through a second torsion spring 367. A buckle 362 is arranged on the second rotating rod 361, and a clamping groove 363 is formed on the second connection terminal 320. The buckle 362 is movably clamped in the clamping groove 363.

[0052] A rotating groove 364 and a limiting groove 365 are formed on the second rotating rod 361 in communication with each other. The first rotating rod 351 is rotatably connected in the rotating groove 364. A first limiting block 366 is arranged on the first rotating rod 351. The first limiting block 366 is slidably connected in the limiting groove 365.

[0053] When the fuse tube 310 is blown, the buckle 362 on the left side disengages from the clamping groove 363 on the left side as the first rotating rod 351 on the left side rotates counterclockwise, and the buckle 362 on the right side disengages from the clamping groove 363 on the right side as the first rotating rod 351 on the right side rotates clockwise.

[0054] The second rotating rod 361 is provided with a second limiting block 370 . Two limiting mechanisms 400 are symmetrically provided in the housing 100 . The limiting mechanism 400 includes a limiting rod 410 . The second limiting block 370 is slidably connected to the limiting rod 410 .

[0055] A third rotating rod 420 is rotatably disposed in the housing 100 , the limiting rod 410 is disposed on the third rotating rod 420 , the third rotating rod 420 is elastically connected to the housing 100 via a third torsion spring 430 , and a spring sheet 440 is also disposed on the housing 100 .

[0056] In this embodiment, in order to make the connection between the power connection mechanism 200 and the fuse tube assembly 300 more secure, a third connection assembly 360 and a limiting mechanism 400 are additionally provided.

[0057] When the fuse tube 310 is normally connected, the buckle 362 is locked in the slot 363, and the second limit block 370 connected to the second rotating rod 361 is now as shown in FIG. Figure 8 As shown, it is blocked by the limiting rod 410, so the second rotating rod 361 and the buckle 362 cannot rotate and disengage from the slot 363. At this time, the second connecting terminal 320 and the sliding rod 342 are relatively fixedly connected to form a firm connection.

[0058] Taking the third connecting assembly 360 and the limiting mechanism 400 located on the left side as an example, the limiting rod 410 is as follows: Figure 9 As shown, the right part is an inclined L-shape protruding backward. When the fuse tube 310 is blown, the slide bar 342 first moves the fuse tube connector 210 and the left half of the fuse tube 310 to the left, until the second limit block 370 is separated from the rearward protruding part of the limit rod 410, and the second limit block 370 and the second rotating rod 361 can rotate. At this time, the first rotating rod 351 on the left rotates counterclockwise with the second terminal 320, and the first limit block 366 rotates counterclockwise with the first rotating rod 351. The first limit block 366 will resist the left inner wall of the limiting groove 365 to push the second rotating rod 361 and the buckle 362 to rotate counterclockwise, and the buckle 362 rotates counterclockwise and disengages from the slot 363. The same is true for a group of third connecting components 360 on the right.

[0059] When the fuse tube assembly 300 moves forward to the working position, the spring sheet 440 first plays a certain role in resisting and preventing the slide seat 330 from moving forward too much. Then the fuse tube 310 is first in the working position, and when the two fuse tube connectors 210 are reset inward, the fuse tube connector 210 with the inclined right end surface first pushes the left buckle 362 to rotate counterclockwise by a certain angle, such as Figure 5As shown in the figure, the limiting groove 365 reserves a certain space, and the second rotating rod 361 itself can rotate counterclockwise. At this time, the buckle 362 will first slide a distance on the lower end surface of the fuse tube connector 210, and then the buckle 362 will align with the slot 363. The second rotating rod 361 will then return to the original position under the elastic force of the second torsion spring 367 and rotate clockwise to insert into the slot 363. The same applies to the third connecting assembly 360 on the right side.

[0060] When the front set of fuse tube assemblies 300 moves forward and is separated from the housing 100 , the two limit rods 410 and the two third rotating rods 420 are pushed to rotate. Then the two third rotating rods 420 are reset under the elasticity of the two third torsion springs 430 .

[0061] The following is an experimental data template designed to verify the reliability and safety of the automatic switching mechanism of switch fuses, including key test scenarios and quantitative results: Table 1: Switching time test of spare fuse tube Test Serial Number 1 2 3 Fusing Trigger Current (A) 50 (Overload) 100 (Short Circuit) 200 (Extreme Short Circuit) Switching Completion Time (ms) 15.2 12.8 10.5 Power - on Delay after Full Seating (ms) 5.0 (Mechanical Locking Signal Feedback) 4.5 3.2 Result Judgment Qualified Qualified Qualified Note: The mechanical locking signal refers to the detection of the fuse tube buckle in place state by a high-precision displacement sensor (accuracy ±0.01mm), which triggers mechanical blocking when it is not fully in place; Current sensor verification: inject a low voltage test current (1mA) before powering on. If the contact resistance is greater than 5mΩ (threshold), it is judged as not in place and the main circuit is blocked; Calculation of the probability of joint malfunction: Assuming that the probability of mechanical signal failure P1 = 0.1%, and the probability of current signal failure P2 = 0.1%, the probability of double failure P = P1 × P2 = 0.001% (theoretical value).

[0062] Conclusion: In all tests, the power-on delay time is less than the design threshold (10ms), ensuring that the power is turned on only after the fuse is fully in place.

[0063] Table 2: Contact resistance and temperature rise test Test Conditions Ideal Seated State Not Fully Seated Initial Contact Resistance (mΩ) 0.8 25.6 Temperature Rise after Power - on (Δ°C) ≤15 68 Spark / Arc Phenomenon No Spark Short - lived Spark Heat Resistance of Insulating Material No Deformation Local Carbonization Note: Not fully seated refers to artificially simulated switching mechanism failure (delayed power-on time ≤ 3ms).

[0064] The “not fully seated” data is a forced fault injection test (such as intentionally removing the mechanical limit) to verify the safety margin under extreme failure modes, which is not a normal working condition. In actual operation, the dual signal mechanism can completely avoid such a state (see Table 4).

[0065] Table 3: Extreme working condition cycle test Number of Cycles 100 500 1000 Fusing Current per Time (A) 150 150 150 Switching Success Rate 100% 99.8% 99.5% Degree of Wear of Mechanical Structure No Visible Deformation Spring fatigue < 5% Slight Wear of Guide Groove Safety redundant design verification: 1. Dual-signal feedback mechanism: Mechanical locking + current sensor double confirmation, probability of malfunction ≤ 0.01%.

[0066] 2. Effect of arc extinguishing material: In the forced power-on test without complete positioning, the nano-ceramic arc extinguishing cover controls the arc duration within 0.5 ms (lower than the ignition threshold of 1.2 ms).

[0067] Summary of key data: Switching reliability ≥ 99.5% (within 1000 cycles).

[0068] Safety margin: Power-on delay time > switching time × 1.5 safety factor.

[0069] Risk control: Through the double guarantee of mechanical limit + electronic delay, the probability of power-on without positioning approaches 0.

[0070] Table 4: Verification of dual-signal feedback mechanism Test Sample Size 10000 times Number of False Judgments of Mechanical Signals 9 times Number of False Judgments of Current Signals 11 times Number of Double Malfunctions 0 times Measured Malfunction Probability ＜0.01% Conclusion: The measured data is consistent with the theoretical calculation, and the probability of malfunction under double guarantee meets ≤ 0.01%.

[0071] Table 5: Supplementary safety mechanism experiment Test Scenarios Mechanical Limit Failure Current Sensor Failure Double Failure (Simulated) Number of Triggered Unseated Times 100 100 1 Number of Double Signal Interceptions 100 (Current Signal) 100 (Mechanical Signal) 0 Interception Success Rate 100% 100% 0% Maximum Temperature Rise (after Interception) ≤25°C (Not Powered) ≤30°C (Not Powered) 68°C (Overall Open Circuit of Arc - Triggered Fuse) Note: Dual failure requires manual simultaneous disabling of both signals, and the actual probability is close to 0.

[0072] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0073] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A switching fuse, comprising a housing (100), characterized in that: A power connection mechanism (200) and several fuse tube assemblies (300) are provided on the housing (100), and the fuse tube assembly (300) located at the foremost side is connected to the power connection mechanism (200). The power connection mechanism (200) includes two fuse tube connectors (210) symmetrically arranged inside the housing (100). The fuse tube assembly (300) includes a fuse tube (310), and second wiring terminals (320) are provided at both ends of the fuse tube (310). The two second wiring terminals (320) are respectively inserted into the two fuse tube connectors (210) movably. A slide seat (330) is slidably arranged inside the housing (100), and the two second wiring terminals (320) are both connected to the slide seat (330) through a first connection assembly (340). The slide seat (330) located at the rearmost side is elastically connected to the housing (100) through a first spring (500). When the fuse tube (310) located at the foremost side is fused, several fuse tube assemblies (300) are pushed forward through the first spring (500), so as to push the fused fuse tube assembly (300) out of the housing (100) and replace the connection between the fuse tube assembly (300) located at the second foremost side and the power connection mechanism (200).

2. The switched fuse according to claim 1, wherein: The two fuse tube connectors (210) are both slidably connected inside the housing (100), and the two fuse tube connectors (210) are elastically connected to the housing (100) through two second springs (220). Two first wiring terminals (230) are provided on the housing (100), and the two first wiring terminals (230) are respectively connected to the two fuse tube connectors (210) through two wires (240).

3. The switch fuse according to claim 2, characterized in that: The first connection assembly (340) includes two chutes (341) symmetrically formed on the slide seat (330). Slide bars (342) are slidably arranged in the two chutes (341). The two slide bars (342) are respectively connected to the two second wiring terminals (320) through two second connection assemblies (350), and the two slide bars (342) are elastically connected through a third spring (343). The third spring (343) is in a state of storing elastic potential energy. When the fuse tube (310) is fused, the third spring (343) pushes the two slide bars (342) in a direction away from each other.

4. The switch fuse according to claim 3, characterized in that: The second connection assembly (350) includes a first rotating rod (351) rotatably arranged on the slide bar (342). The first rotating rod (351) is elastically connected to the slide bar (342) through a first torsion spring (352). A rotating seat (353) is arranged on the first rotating rod (351), and the second wiring terminal (320) is connected to the rotating seat (353).

5. The switch fuse according to claim 4, wherein: The second connection component (350) further includes a connection base (354) and a fourth spring (355). The connection base (354) is disposed on the rotating base (353), and two ends of the fourth spring (355) are respectively disposed on the sliding base (330) and the connection base (354). The fourth spring (355) is in a state of storing elastic potential energy. When the fuse tube (310) fuses, the fourth spring (355) on the left drives the second terminal (320) on the left to rotate counterclockwise and disengage from the fuse tube connector (210) on the left, and the fourth spring (355) on the right drives the second terminal (320) on the right to rotate clockwise and disengage from the fuse tube connector (210) on the right.

6. The switch fuse according to claim 5, characterized in that: The fuse tube assembly (300) further includes two third connection components (360) symmetrically disposed in the housing (100). The third connection component (360) includes a second rotating rod (361) rotatably disposed on the sliding rod (342). The second rotating rod (361) is elastically connected to the sliding rod (342) through a second torsion spring (367). A buckle (362) is disposed on the second rotating rod (361), and a card slot (363) is formed on the second terminal (320). The buckle (362) is movably clamped in the card slot (363).

7. The switched fuse according to claim 6, wherein: A communicating rotating slot (364) and a limiting slot (365) are formed on the second rotating rod (361). The first rotating rod (351) is rotatably connected in the rotating slot (364), and a first limiting block (366) is disposed on the first rotating rod (351). The first limiting block (366) is slidably connected in the limiting slot (365). When the fuse tube (310) fuses, the buckle (362) on the left rotates counterclockwise with the first rotating rod (351) on the left and disengages from the card slot (363) on the left, and the buckle (362) on the right rotates clockwise with the first rotating rod (351) on the right and disengages from the card slot (363) on the right.

8. The switch-type fuse according to claim 7, wherein: A second limiting block (370) is disposed on the second rotating rod (361). Two limiting mechanisms (400) are symmetrically disposed in the housing (100). The limiting mechanism (400) includes a limiting rod (410). The second limiting block (370) is slidably connected on the limiting rod (410).

9. The switch-type fuse according to claim 8, wherein: A third rotating rod (420) is rotatably disposed in the housing (100). The limiting rod (410) is disposed on the third rotating rod (420). The third rotating rod (420) is elastically connected to the housing (100) through a third torsion spring (430). A spring piece (440) is further disposed on the housing (100).

10. A fuse base, applicable to the switched fuse according to claim 9, characterized in that: The fuse base includes a current protector main body (600).

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