CN112289654B

CN112289654B - Fuse with adjustable fusing current

Info

Publication number: CN112289654B
Application number: CN202011326892.6A
Authority: CN
Inventors: 李青国
Original assignee: Shaoxing Keye Electric Appliance Co ltd
Current assignee: Shaoxing Keye Electric Appliance Co ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-09-21
Anticipated expiration: 2040-11-24
Also published as: CN112289654A

Abstract

The invention discloses a fuse with adjustable fusing current, which comprises conductive connecting pieces positioned at two ends, a fuse body positioned between the conductive connecting pieces, and a plurality of partition clamps, wherein an insulating elastic sleeve is arranged outside the fuse body, a conductive medium is filled in the insulating elastic sleeve, the section of the fuse body is gradually increased from one end to the other end, grooves which are correspondingly matched with the fuse body are arranged at the clamping positions of the partition clamps one by one, and the partition clamps clamp the periphery of the insulating elastic sleeve to separate one section of the fuse body from the conductive medium and partition the conductive medium at two sides. The fuse with the adjustable fusing current can adjust the fusing current of the fuse through adjusting the position of the elastic isolating piece, so that one fuse can meet the requirements of use under various use working conditions.

Description

Fuse with adjustable fusing current

Technical Field

The invention belongs to the technical field of fuses, and particularly relates to a fuse with adjustable fusing current.

Background

The fuse is an electrical component which fuses a melt with heat generated by itself to open a circuit when a current exceeds a predetermined value. The fuse melts the melt by the heat generated by the fuse after the current exceeds a specified value for a period of time, so as to cut off the circuit; a current protector made by applying the principle. The fuse is widely applied to high and low voltage distribution systems, control systems and electric equipment, and is one of the most commonly applied protection devices as a short circuit and overcurrent protector.

The main functional component of the fuse is a fuse link, the thickness of the fuse link determines the current for fusing the fuse link on the premise that the material of the fuse link is not changed, and the thinner the fuse link is, the larger the resistance value is, and the smaller the fusing current is. In the prior art, the thickness of a general fuse link is fixed, the thickness of the fuse link arranged in the fuses with different fusing currents is different, and the fuses with proper specifications need to be arranged according to the use working conditions. That is to say, the fuse among the prior art generally all can only adapt to the service condition, can't satisfy different service conditions, can not satisfy the regulation of fusing current promptly.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the fuse with the adjustable fusing current, and the fuse can adjust the fusing current value according to the use working condition, so that one fuse can be used under various use working conditions.

In order to solve the technical problem, the invention is solved by the following technical scheme: fuse of fusing current adjustable, including the electrically conductive connecting piece that is located both ends to and be located the fuse-link between the electrically conductive connecting piece, the fuse-link outside is provided with insulating elastic sleeve, insulating elastic sleeve intussuseption is filled with conductive medium, the fuse-link is crescent from one end to other end cross-section, the fuse still includes a plurality of wall presss from both sides, and is a plurality of the centre gripping position that cuts off the clamp be provided with the fuse-link slot that the one-to-one matches everywhere, cut off press from both sides and press from both sides insulating elastic sleeve periphery with one of them section the fuse-link with conductive medium breaks away from the contact and with both sides the conductive medium cuts off. When the fuse with adjustable fusing current is installed, the positions of the partition clamps and the positioning partition clamps can be selected according to the required fusing current, so that one section of the fuse body serves as a fusing position which really plays a role, the fusing current is determined by the radius of the fuse body at the position, and the fuse bodies at other positions are not fused due to the fact that external conducting media are shunted. In the use, cut off and press from both sides the fuse-link of inner cladding and can heat gradually when passing the electric current and melt until gasification, the fuse-link fracture, the clearance appears, and the clearance is punctured and produces electric arc by the electric field, opens circuit after extinguishing completely until the electric arc, consequently cuts off the fusing current of the adjustable fuse in position of pressing from both sides through selection and regulation for a fuse can satisfy and use under the multiple use condition.

In the above technical solution, preferably, the conductive medium is conductive metal powder and/or conductive liquid. The fuse link at the position of the partition clamp can be conveniently separated from contact with the metal powder and/or the conductive liquid through the elasticity of the partition clamp.

In the above technical solution, preferably, an insulating support member is disposed between the two conductive connecting members. The stress of the fuse link can be reduced through the support of the insulating support piece, and the accidental deformation or breakage of the fuse link is prevented.

In the above technical scheme, preferably, connecting platforms are arranged at two ends of the fuse link, and the connecting platforms are welded to the conductive connecting piece. By adopting the structure, the fuse link and the conductive connecting piece can be more reliably connected.

In the above technical scheme, preferably, the fuse link is a step-shaped pipe body with a gradually reduced cross section from one end to the other end, and the width of the partition clip is the same as the length of a pipe section with the same radius on the step-shaped pipe body. By adopting the structure, each pipe section on the fuse link body is ensured to correspond to a certain fusing current, and the partition clamp is convenient to select and adjust and position.

In the above technical scheme, preferably, the partition clamp includes a bending elastic piece, two fixing blocks and a bending pressure rod, the fixing blocks are arranged between the bending elastic piece and the fixing block, the grooves are arranged on the connecting surfaces of the two fixing blocks, first positioning holes are arranged on two sides of the two fixing blocks, two sides of the end portion of the bending elastic piece are curled to form second positioning holes, and two ends of the bending pressure rod are bent to penetrate into the second positioning holes and the first positioning holes. The partition clamp is simple in structure, low in manufacturing cost, convenient to assemble and firm in positioning.

In the above technical solution, preferably, a pressing plate is slidably disposed in the groove, and a spring is disposed between the pressing plate and the end surface of the groove. Adopt this structure at the in-process of fuse-link fusing, the fuse-link is heated and is melted, and the elasticity of spring can be extruded molten fuse-link from both sides, further makes the fuse-link of this department attenuate and generate heat more violent, extrudes then opens circuit until the fuse-link in the stripper plate completely for fusing speed when reaching fusing current is faster.

In the above technical scheme, preferably, the groove end face is provided with a guide hole, the extrusion plate is provided with a guide rod penetrating the guide hole, and the spring is sleeved on the guide rod. By adopting the structure, the extrusion plate can move more reliably, and the spring can be prevented from sliding out.

In the above technical scheme, preferably, the guide hole runs through the fixed block, the guide hole opening side is provided with a first limiting ring, the guide rod stretches into the one end of the guide hole is provided with a second limiting ring, and the first limiting ring and the second limiting ring are matched for limiting the guide rod. By adopting the structure, the extrusion plate can not fall off when the partition clamp is opened, and the operation is more convenient.

Compared with the prior art, the invention has the following beneficial effects: when the fuse with adjustable fusing current is installed, the positions of the partition clamps and the positioning partition clamps can be selected according to the required fusing current, so that one section of the fuse body serves as a fusing position which really plays a role, the fusing current is determined by the radius of the fuse body at the position, and the fuse bodies at other positions are not fused due to the fact that external conducting media are shunted. In the use, cut off and press from both sides the fuse-link of inner cladding and can heat gradually when passing the electric current and melt until gasification, the fuse-link fracture, the clearance appears, and the clearance is punctured and produces electric arc by the electric field, opens circuit after extinguishing completely until the electric arc, consequently cuts off the fusing current of the adjustable fuse in position of pressing from both sides through selection and regulation for a fuse can satisfy and use under the multiple use condition.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional structure diagram of an embodiment of the invention.

Fig. 3 is a schematic view of a fuse body clamped by a partition clip according to an embodiment of the present invention.

Fig. 4 is a schematic top view of a partition clip according to an embodiment of the present invention.

Fig. 5 is a schematic structural view illustrating the partition clip according to the embodiment of the present invention when the folding pressing rod is pressed to open the partition clip.

Detailed Description

The invention is described in further detail below with reference to the following detailed description and accompanying drawings: referring to fig. 1 to 5, a fuse with adjustable fusing current, including conductive connecting parts 1 located at two ends, and a fuse body 2 located between the conductive connecting parts 1, the fuse body 2 is made of existing common fuse body materials, for example, copper, silver, zinc, lead-tin alloy and other materials can all be used, an insulating elastic sleeve 3 is arranged outside the fuse body 2, a conductive medium 4 is filled in the insulating elastic sleeve 3, the cross section of the fuse body 2 gradually increases from one end to the other end, the fuse further comprises a plurality of partition clips 5, clamping positions of the partition clips 5 are provided with grooves 51 which are matched with the fuse body 2 in one-to-one correspondence, and the partition clips 5 clip are arranged on the periphery of the insulating elastic sleeve 3 to separate one section of the fuse body 2 from the conductive medium 4 and partition the conductive medium 4 on two sides. When the fuse with adjustable fusing current is installed, the positions of the partition clip 5 and the positioning partition clip 5 can be selected according to the required fusing current, so that one section of the fuse body 2 serves as a real fusing position, the radius of the fuse body 2 at the position determines the fusing current, and the fuse bodies 2 at other positions are not fused due to the fact that the external conductive medium 4 shunts. In the use, cut off and press from both sides the fuse-link 2 of cladding in 5 and can heat gradually when passing the electric current and melt until gasification, fuse-link 2 fracture, the clearance appears, and the clearance is punctured and produce electric arc by the electric field, opens a way after extinguishing completely until the electric arc, consequently cuts off the fusing current of the adjustable fuse in position of pressing from both sides 5 through selecting and adjusting for a fuse can satisfy and use under the multiple use condition.

The conductive medium 4 is a conductive metal powder and/or a conductive liquid. The conductive medium 4 may be powder of various conductive metals, and the conductive liquid may be, for example, mercury and various electrolyte solutions, or may be a mixture of powder of conductive metal and mercury and various electrolyte solutions. The fuse link 2 at the position of the separation clamp 5 can be conveniently separated from contact with the metal powder and/or the conductive liquid through the elasticity of the separation clamp 5.

An insulating support member 6 is arranged between the two conductive connecting members 1. The stress of the fuse link 2 can be reduced by the support of the insulating support member 6, the fuse link 2 is prevented from being accidentally bent or broken, and the insulating support member 6 can be supported in a rod form and can also be supported in a shell form.

The two ends of the fuse link 2 are provided with connecting platforms 21, and the connecting platforms 21 are welded with the conductive connecting piece 1. By adopting the structure, the fuse link 2 and the conductive connecting piece 1 can be more reliably connected.

The fuse link 2 is a step-shaped pipe body with the section gradually reduced from one end to the other end, and the width of the elastic partition clip 5 is consistent with the length of a pipe section with the same radius on the step-shaped pipe body. By adopting the structure, each pipe section on the fuse link 2 is ensured to correspond to a certain fusing current, and the position of the partition clip 5 is conveniently adjusted and positioned.

In this embodiment, the partition clip 5 includes a bending elastic piece 52, two fixing blocks 53 and a bending pressing rod 54, the fixing blocks 53 are disposed between the opposite bending elastic pieces 52, a groove 51 is disposed on a surface where the two fixing blocks 53 are connected, first positioning holes 55 are disposed on two sides of the two fixing blocks 53, two sides of an end of the bending elastic piece 52 are curled to form second positioning holes 56, and two ends of the bending pressing rod 54 are bent to penetrate the second positioning holes 56 and the first positioning holes 55. The partition clamp 5 has the advantages of simple structure, low manufacturing cost, convenient assembly and firm positioning.

A pressing plate 57 is slidably provided in the groove 51, and a spring 58 is provided between the pressing plate 57 and an end surface of the groove 51. The fusing process of the traditional fuse link comprises four stages 1, the fuse link of the fuse link generates heat due to passing of overload current or short-circuit current, the temperature of the fuse link rises to the melting point of a melt alloy material, but the melt is still in a solid state and does not start to melt. 2. The alloy metal of the fuse link begins to transform from a solid state to a plastic state and a liquid state, and the melt temperature remains at the melting point because the melt absorbs a portion of the heat (the heat of fusion). 3. The molten metal is heated until it reaches the melt vaporization point, which is the second heating stage. 4. The melt metal is broken, a gap appears, and the gap is broken down by an electric field to generate electric arcs until the electric arcs are completely extinguished. This process results in the current having reached the fuse link's blowing current, but before the arc is extinguished, still in the energized state, resulting in a slower blowing reaction of the fuse. Adopt this structure at the in-process of fuse-link 2 fusing, fuse-link 2 is heated and melts, and the elasticity of spring 58 can extrude the fuse-link 2 that melts from both sides, further makes the fuse-link 2 of this department taper and generate heat more violent, extrudes then opens circuit until the fuse-link in the stripper plate 57 completely, need not to experience the stage that fuse-link 2 gasifies to electric arc and extinguishes for fusing speed when reaching fusing current is faster.

The end face of the groove 51 is provided with a guide hole 59, the extrusion plate 57 is provided with a guide rod 510 penetrating into the guide hole 59, and the spring 58 is sleeved on the guide rod 510. With this structure, the movement of the pressing plate 57 is more reliable, and the spring 58 can be prevented from slipping out.

The guide hole 59 penetrates through the fixing block 53, a first limiting ring 511 is arranged on the opening side of the guide hole 59, a second limiting ring 512 is arranged at one end, extending into the guide hole 59, of the guide rod 510, and the first limiting ring 511 and the second limiting ring 512 are matched with the limiting guide rod 510. By adopting the structure, the extrusion plate 57 can not fall off when the partition clip 5 is opened, and the operation is more convenient.

In this embodiment, the pressing plate 57 is connected to the guide rod 510 by a screw, and when the pressing plate 57 is assembled, the guide rod 510 passes through the guide hole of the fixing block 53, and the spring 58 is sleeved on the guide rod 510 and then tightened to complete the assembly.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims

1. Fuse of fusing current adjustable, including electrically conductive connecting piece (1) that is located both ends to and fuse-link (2) that are located between electrically conductive connecting piece (1), its characterized in that: the fuse is characterized in that an insulating elastic sleeve (3) is arranged on the outer side of the fuse body (2), a conductive medium (4) is filled in the insulating elastic sleeve (3), the cross section of the fuse body (2) gradually increases from one end to the other end, the fuse further comprises a plurality of partition clamps (5), grooves (51) which are matched with the fuse body (2) in a one-to-one correspondence mode are formed in clamping positions of the partition clamps (5), the partition clamps (5) are clamped on the periphery of the insulating elastic sleeve (3) to separate one section of the fuse body (2) from the conductive medium (4) and partition the conductive medium (4) on two sides, each partition clamp (5) comprises a bending elastic piece (52), two fixing blocks (53) and a bending pressure rod (54), the fixing blocks (53) are arranged between the bending elastic pieces (52) in a relative mode, the grooves (51) are formed in the surfaces where the fixing blocks (53) are connected, two sides of the two fixing blocks (53) are provided with first positioning holes (55), two sides of the end part of the bending elastic piece (52) are curled to form second positioning holes (56), and two ends of the bending pressure lever (54) are bent to penetrate into the second positioning holes (56) and the first positioning holes (55).

2. A fuse of adjustable fuse current as claimed in claim 1, wherein: the conductive medium (4) is conductive metal powder and/or conductive liquid.

3. A fuse of adjustable fuse current as claimed in claim 1, wherein: an insulating support piece (6) is arranged between the two conductive connecting pieces (1).

4. A fuse of adjustable fuse current as claimed in claim 1, wherein: the fuse-link (2) both ends are provided with connecting platform (21), connecting platform (21) with electrically conductive connecting piece (1) welding.

5. A fuse of adjustable fuse current as claimed in claim 1, wherein: the fuse link (2) is a step-shaped pipe body with the cross section gradually reduced from one end to the other end, and the width of the partition clamp (5) is consistent with the length of a pipe section with the same radius on the step-shaped pipe body.

6. A fuse of adjustable fuse current as claimed in claim 1, wherein: a squeezing plate (57) is arranged in the groove (51) in a sliding mode, and a spring (58) is arranged between the squeezing plate (57) and the end face of the groove (51).

7. A fuse having a variable fuse current as claimed in claim 6, wherein: the end face of the groove (51) is provided with a guide hole (59), the extrusion plate (57) is provided with a guide rod (510) penetrating through the guide hole (59), and the guide rod (510) is sleeved with the spring (58).

8. A fuse having a variable fuse current as claimed in claim 7, wherein: the guiding hole (59) runs through fixed block (53), guiding hole (59) opening side is provided with first spacing ring (511), guide bar (510) stretch into the one end of guiding hole (59) is provided with second spacing ring (512), first spacing ring (511) with second spacing ring (512) cooperation is spacing guide bar (510).