Arc fuse and backup protection surge protector

Abstract

The utility model relates to the field of surge protector equipment, in particular to an arc fuse and a backup protection surge protector. The arc fuse provided by the utility model is used for backup protection of a surge protector body and comprises an arc member and a fusing member, the fusing member is used for being connected with the surge protector body in series, the arc member is matched with the fusing member, and the arc member is used for being electrically connected with a lightning protection circuit where the surge protector is located. And an electric arc is generated to fuse the fuse element, so that the lightning protection circuit is disconnected. The impact current resistance of the arc fuse can be improved.

Description

Technical Field

[0001] The utility model relates to the field of surge protector equipment, in particular to an arc fuse and a backup protection surge protector. Background Art

[0002] The function of the surge protector body is to protect the line it is connected to. The surge protector body is used in electrical circuits or communication lines. Its principle is to conduct and shunt the impact current through the internal varistor, thereby preventing the impact current from damaging the equipment on the electrical circuit or communication line. The varistor may deteriorate after long-term use. In the traditional solution, a thermal trip component is provided in the surge protector body used in the electrical circuit. When the varistor deteriorates and the surge protector body is subjected to a continuous small current impact, the thermal trip component can disconnect the connection between the line and the ground wire by melting, thereby achieving the purpose of thermal tripping; and for the power frequency current, the surge protector body is protected by connecting it in series with the fuse. Specifically, when the power frequency current flows through the fuse, the circuit in the fuse is disconnected, thereby preventing the heat generated by the power frequency circuit from causing the surge protector body to burn. The defect of the above scheme is that the surge protector body is connected in series with the fuse. When the power frequency current flows through it, the current flowing through the fuse is small due to the large resistance of the varistor of the surge protector body. In order to make the fuse blow, a model with a smaller rated current is required. When the impact current flows through the surge protector body, it will inevitably flow through the fuse, which may cause the circuit in the fuse with a smaller rated current to be disconnected. Therefore, the fuse in the above scheme has poor impact current resistance. Utility Model Content

[0003] On the one hand, the utility model provides an arc fuse, which can improve the ability of the arc fuse to withstand impact current;

[0004] On the other hand, the utility model provides a backup protection surge protector.

[0005] The arc fuse provided by the utility model is used for backup protection of a surge protector body, and comprises an arc component and a fuse component. The fuse component is used to be connected in series with the surge protector body, the arc component cooperates with the fuse component, the arc component is used to be electrically connected to a lightning protection circuit where the surge protector is located, and generates an arc to melt the fuse component, so that the lightning protection circuit is disconnected.

[0006] Furthermore, the fuse element includes a fuse portion, and the arc element includes an electrode end, and the electrode end abuts against the fuse portion;

[0007] In a first direction from the electrode end to the fuse part, the electrode end forms a tip structure, and / or in a direction opposite to the first direction, the fuse part forms a tip structure;

[0008] An arc is generated between the electrode terminal and the fuse part to melt the fuse part.

[0009] Furthermore, the fuse element also includes a conductive plate, which is used to be connected in series with the lightning protection circuit, and the fuse part is located on the conductive plate; the arc element also includes a conductive block, which is arranged at intervals from the conductive plate along a first direction, and the conductive block is electrically connected to the lightning protection circuit through a switch element, and the electrode end is located on the conductive block.

[0010] Furthermore, the fuse also includes an adjusting member, and the adjusting member cooperates with the conductive block and / or the fuse part so that the electrode end abuts against the fuse part.

[0011] Furthermore, the arc fuse also includes a first bracket, which is provided with a first mounting hole, the conductive block is located in the first mounting hole and slides with the bracket in a direction parallel to the first direction, the electrode end can extend from an opening at one end of the first mounting hole, the adjusting member is meshed in the first mounting hole, and the tail end of the adjusting member cooperates with the conductive block.

[0012] Furthermore, the arc fuse also includes a spring clip rack, which includes a first spring clip and a second spring clip, the two second spring clips are arranged opposite to each other, the first spring clip and the two second spring clips are combined to form a clamping cavity, the conductive block is located in the clamping cavity, the two second spring clips are respectively abutted against the two side end faces of the conductive block, and the first spring clip is abutted against the conductive block along a first direction.

[0013] Furthermore, along the first direction, the cross-sectional dimension of the electrode terminal perpendicular to the first direction gradually decreases.

[0014] Furthermore, the arc fuse further comprises a second bracket, and the first bracket and at least a portion of the conductive sheet are embedded in the bracket.

[0015] Furthermore, the bracket includes two petals, each of which is provided with a recessed portion. The two petals can cooperate with each other so that the two recessed portions enclose a cavity, and the fuse portion and the electrode end are both located in the cavity.

[0016] Furthermore, the arc fuse also includes a tube body and two fuse caps, the two fuse caps are respectively arranged at the openings at both ends of the tube body and are sleeved with the tube body, the bracket is located inside the tube body, and the two ends of the conductive sheet extend out of the tube body through windows on the fuse caps.

[0017] The backup protection surge protector provided by the utility model comprises the arc fuse as described in any one of the above items.

[0018] Beneficial Effects

[0019] The fuse in this solution is arranged in series on the lightning protection circuit where the surge protector body is located, and the heating element can draw power from the lightning protection circuit. When the power frequency current flows through the lightning protection circuit where the surge protector body is located, the heating element generates heat and melts the fuse. Compared with the traditional solution, the power frequency current directly flows to the arc fuse through the surge protector body, and the fuse in the arc fuse melts due to self-heating. In the arc fuse in this solution, only the fuse is connected in series on the lightning protection circuit where the surge protector body is located. The arc element can draw power from the lightning protection circuit. When the power frequency current flows through the lightning protection circuit, the arc element generates an arc to melt the fuse. Compared with the traditional solution in which the fuse is heated as a whole, the arc in this solution acts on a specific position of the fuse, so that the heat is concentrated and the melting temperature generated is higher. Since the arc element can provide a higher melting temperature, a fuse with a higher rated temperature can be selected to avoid the impact current from disconnecting the circuit in the arc fuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a cross-sectional schematic diagram of an arc fuse provided in Embodiment 1 of the present utility model;

[0022] Figure 2 This is a schematic diagram of the coordination of the arc fuse provided in the first embodiment of the utility model;

[0023] Figure 3 It is a schematic diagram of the coordination of the arc fuse provided in the second embodiment of the present utility model.

[0024] Figure numbers: 1-arc part; 2-fuse part; 3-conductive block; 4-electrode end; 5-conductive sheet; 6-fuse part; 7-first bracket; 8-first mounting hole; 9-adjusting part; 10-second bracket; 11-cavity; 12-second spring piece; 13-first spring piece. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0026] Embodiment 1

[0027] like Figure 1 and Figure 2 An arc fuse is shown, which is used for backup protection of a surge protector body, and includes an arc piece 1 and a fuse piece 2. The fuse piece 2 is used to be connected in series with the surge protector body. The arc piece 1 cooperates with the fuse piece 2. The arc piece 1 is used to be electrically connected to the lightning protection circuit where the surge protector is located, and an arc is generated to melt the fuse piece 2, so that the lightning protection circuit is disconnected.

[0028] The function of the surge protector body is to protect the line it is connected to. The surge protector body is used in power supply circuits or communication lines. Its principle is to realize the conduction and shunting of the impact current through the internal varistor, so as to avoid the impact current from damaging the equipment on the power supply circuit or communication line. The varistor may deteriorate after long-term use. In the traditional solution, a thermal trip component is provided in the surge protector body used in the power supply circuit. When the varistor deteriorates and the surge protector body is subjected to a continuous small current impact, the thermal trip component can disconnect the connection between the line and the ground wire by melting, thereby achieving the purpose of thermal tripping; and for the power frequency current, the surge protector body is protected by connecting it in series with the arc fuse. Specifically, when the power frequency current flows through the arc fuse, the circuit in the arc fuse is disconnected, thereby avoiding the heat generated by the power frequency circuit causing the surge protector body to burn. The defect of the above scheme is that the surge protector body is connected in series with the arc fuse. When the power frequency current flows through, the current flowing through the arc fuse is small due to the large resistance of the varistor of the surge protector body. In order to make the arc fuse blow, a model with a smaller rated current is required. When the impact current flows through the surge protector body, it will inevitably flow through the arc fuse, which may cause the circuit in the arc fuse with a smaller rated current to be disconnected. Therefore, the arc fuse in the above scheme has poor impact current resistance. Compared with the above scheme, the fuse 2 in this scheme is arranged in series on the lightning protection circuit where the surge protector body is located, and the heating element can draw power from the lightning protection circuit. When the power frequency current flows through the lightning protection circuit where the surge protector body is located, the heating element generates heat and melts the fuse 2. Compared with the traditional scheme, the power frequency current directly flows to the arc fuse through the surge protector body, and the fuse in the arc fuse melts due to self-heating. In the arc fuse of this scheme, only the fuse 2 is connected in series on the lightning protection circuit where the surge protector body is located. The arc element 1 can draw power from the lightning protection circuit. When the power frequency current flows through the lightning protection circuit, the arc element 1 generates an arc to melt the fuse 2. Compared with the traditional scheme in which the fuse is heated as a whole, the arc in this scheme acts on a specific position of the fuse 2, so that the heat is concentrated and the melting temperature generated is higher. Since the arc element 1 can provide a higher melting temperature, a fuse 2 with a higher rated temperature can be selected to avoid the impact current from disconnecting the circuit in the arc fuse.

[0029] In an optional embodiment, the fuse 2 includes a fuse portion 6, and the arc member 1 includes an electrode end 4, and the electrode end 4 abuts against the fuse portion 6;

[0030] In a first direction from the electrode terminal 4 to the fuse portion 6, the electrode terminal 4 forms a tip structure, and / or in a direction opposite to the first direction, the fuse portion 6 forms a tip structure;

[0031] An arc is generated between the electrode terminal 4 and the fuse part 6 to melt the fuse part 6 .

[0032] Preferably, the electrode terminal 4 forms a pointed structure, the end of the electrode terminal 4 abuts against the end surface where the fuse part 6 is located, and the end of the electrode terminal 4 is tapered, and the contact area between the electrode terminal 4 and the fuse part 6 is small, so when the electrode terminal 4 abuts against the fuse part 6, the connection between the electrode terminal 4 and the fuse part 6 is virtual, so that an arc is generated between the electrode terminal 4 and the fuse part 6. Compared with the traditional solution in which there is a gap between the electrode terminal 4 and the fuse part 6 and an arc is generated by the gap, the electrode terminal 4 in this solution abuts against the fuse part 6, and during assembly, there is no need to consider the gap distance between the electrode terminal 4 and the fuse part 6, thereby reducing the process requirements for the assembly of the fuse 2 and avoiding the situation in which the gap between the electrode terminal 4 and the fuse part 6 cannot generate an arc due to inadequate assembly.

[0033] In an optional embodiment, the fuse 2 also includes a conductive sheet 5, which is used to be connected in series with the lightning protection circuit, and the fuse part 6 is located on the conductive sheet 5; the arc component 1 also includes a conductive block 3, which is spaced apart from the conductive sheet 5 along the first direction, and the conductive block 3 is electrically connected to the lightning protection circuit through a switch component, and the electrode end 4 is located on the conductive block 3.

[0034] The conductive sheet 5 is a metal sheet, and the two ends of the conductive sheet 5 are respectively a first connection end and a second connection end. A number of weakened sections with smaller widths are arranged at intervals along the direction from the first connection end to the second connection end, and one of the weakened sections cooperates with the electrode end 4 to form a fuse 6. The conductive block 3 is a carbon electrode, and a copper rod is inserted into the carbon electrode. The copper rod is connected to the lightning protection circuit through a switch circuit. The switch circuit is provided with a switch component of an electromagnetic release, and the electromagnetic component of the electromagnetic release is connected to the lightning protection circuit through a current transformer. The carbon electrode protrudes near the fuse 6 to form the electrode end 4, which is a tip structure, and an arc is generated between the electrode end 4 and the fuse 6 through the principle of tip discharge.

[0035] In an optional embodiment, the fuse 2 further includes an adjusting member 9 , which cooperates with the electrode terminal 4 and / or the fuse part 6 so that the electrode terminal 4 and the fuse part 6 abut against each other.

[0036] Preferably, the adjusting member 9 cooperates with the electrode terminal 4 .

[0037] The fuse part 6 is located in the fuse 2 and keeps its position relatively fixed. The electrode end 4 cooperates with the adjusting member 9 to adjust the distance between the electrode end 4 and the fuse part 6 and fix the position of the electrode end 4. In this solution, during assembly, there is first a gap between the electrode end 4 and the fuse part 6, and then the adjusting member 9 is used to make the electrode end 4 approach and abut against the fuse part 6. The adjusting member 9 constrains the electrode end 4, and the electrode end 4 keeps abutting against the fuse part 6.

[0038] In an optional embodiment, the arc fuse also includes a first bracket 7, which is provided with a first mounting hole 8. The conductive block 3 is located in the first mounting hole 8 and slides with the bracket in a direction parallel to the first direction. The electrode end 4 can extend from an opening at one end of the first mounting hole 8. The adjusting member 9 is meshed and fitted in the first mounting hole 8, and the tail end of the adjusting member 9 cooperates with the conductive block 3.

[0039] The first mounting hole 8 is a threaded hole, and the first mounting hole 8 has a first opening and a second opening. The conductive block 3 is located in the first mounting hole 8, and the electrode end 4 is exposed from the first opening. The adjusting member 9 is a screw, which extends into the first mounting hole 8 from the second opening and engages with the first mounting hole 8. The tail end of the screw abuts against the conductive block 3. When the screw is turned, the screw is screwed in along the first direction, and its tail end pushes the conductive block 3 so that the electrode end 4 approaches along the first direction and abuts against the fuse 6. There is a self-locking between the screw and the first mounting hole 8, and the conductive block 3 cannot move in the direction opposite to the first direction, and always maintains abutment with the fuse 6.

[0040] In an optional embodiment, along the first direction, the cross-sectional dimension of the electrode terminal 4 perpendicular to the first direction gradually decreases.

[0041] Preferably, the electrode end 4 is conical.

[0042] In an optional implementation, the arc fuse further includes a second bracket 10, and the first bracket 7 and at least a portion of the conductive sheet 5 are embedded in the bracket.

[0043] In an optional embodiment, the bracket includes two petals, each of which is provided with a recessed portion. The two petals can cooperate so that the two recessed portions enclose a cavity 11, and the fuse portion 6 and the electrode end 4 are both located in the cavity 11.

[0044] Embodiment 2

[0045] like Figure 3 The arc fuse shown also includes a spring clip rack, which includes a first spring clip 13 and a second spring clip 12. The two second spring clips 12 are arranged opposite to each other. The first spring clip 13 and the two second spring clips 12 are combined to form a clamping cavity. The conductive block 3 is located in the clamping cavity. The two second spring clips 12 are respectively against the two side end faces of the conductive block 3, and the first spring clip 13 is against the conductive block 3 along the first direction.

[0046] The first spring piece 13 and the second spring piece 12 of the spring piece frame are both formed by bending a metal plate. The two second spring pieces 12 clamp the conductive block 3 from both sides. The first spring piece 13 is bent to form a leaf spring structure, which generates a force along the first direction on the conductive block 3, thereby causing the electrode end 4 to offset the fuse part 6.

[0047] Embodiment 3

[0048] The backup protection surge protector provided by the utility model comprises an arc fuse as in any of the above embodiments.

[0049] The fuse 2 in this scheme is arranged in series on the lightning protection circuit, and the surge protector body is also connected in series on the lightning protection circuit. An electrical component is provided on the switch circuit, and the electrical component can control whether the switch circuit is energized according to the current electrical parameters of the lightning protection circuit. When the industrial frequency current flows through the lightning protection circuit, the electrical component energizes the switch circuit according to preset conditions. The source of its electric energy is the lightning protection circuit. After the switch circuit is energized, the arc component 1 transfers heat to the fuse 2 through the arc.

[0050] In an optional embodiment, a current transformer is provided on the lightning protection circuit, and the current transformer includes a primary side and a secondary side. The primary side is connected in series to the lightning protection circuit, and the secondary side is connected in series to the tripping circuit. The tripping circuit is provided with an electromagnetic component of an electromagnetic tripper, and the switch component of the electromagnetic tripper is arranged on the switching circuit. The power supply end of the switching circuit is connected to the lightning protection circuit.

[0051] When a large overcurrent appears on the lightning protection circuit where the surge protector body is located, the secondary side of the current transformer outputs current on the tripping circuit, causing the electromagnetic release to execute the action of closing the switch component. The arc component 1 on the switching circuit is electrically connected to the lightning protection circuit, and a voltage is generated between the arc component 1 and the fuse component 2. When the voltage exceeds the threshold, an arc is generated between the electrode end 4 of the arc component 1 and the fuse part 6 on the fuse component 2. The arc heats the fuse part 6 to melt it, thereby blowing the fuse component 2. Since the fuse component 2 is connected in series to the lightning protection circuit, the lightning protection circuit is disconnected. At this time, the power frequency current on the lightning protection circuit is disconnected, and the secondary side of the current transformer does not generate current. The arc between the electrode end 4 of the arc component 1 and the fuse part 6 on the fuse component 2 disappears.

[0052] It should be noted that any of the above embodiments is illustrative of the present invention rather than limiting the present invention, and that those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation on the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of multiple such elements. The present invention may be implemented by means of hardware comprising several different elements and by means of appropriately programmed computers. In a unit claim that lists several devices, several of these devices may be embodied by the same hardware item. The use of the words primary, secondary, previous, and next, etc. does not indicate any order. These words may be interpreted as names.

[0053] The above implementation modes are only suitable for illustrating the present invention, but not for limiting the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The scope of patent protection of the present invention should be limited by the claims.

Claims

1. An arc fuse for backup protection of a surge protector body, characterized in that: The invention comprises an arcing component (1) and a fuse component (2), wherein the fuse component (2) is used to be connected in series with a surge protector body, the arcing component (1) cooperates with the fuse component (2), and the arcing component (1) is used to be electrically connected to a lightning protection circuit where the surge protector is located, and to generate an arc to fuse the fuse component (2), thereby disconnecting the lightning protection circuit.

2. The arc fuse according to claim 1, characterized in that: The fuse (2) comprises a fuse part (6), and the arc part (1) comprises an electrode end (4), wherein the electrode end (4) abuts against the fuse part (6); In a first direction from the electrode end (4) to the fuse part (6), the electrode end (4) forms a tip structure, and / or in a direction opposite to the first direction, the fuse part (6) forms a tip structure; An arc is generated between the electrode end (4) and the fuse part (6) to melt the fuse part (6).

3. The arc fuse according to claim 2, characterized in that: The fuse (2) further comprises a conductive sheet (5), the conductive sheet (5) being used to be connected in series with the lightning protection circuit, and the fuse part (6) being located on the conductive sheet (5); the arc component (1) further comprises a conductive block (3), the conductive block (3) being arranged spaced apart from the conductive sheet (5) along a first direction, the conductive block (3) being electrically connected to the lightning protection circuit via a switch component, and the electrode end (4) being located on the conductive block (3).

4. The arc fuse according to claim 3, characterized in that: The fuse (2) further comprises an adjusting member (9), wherein the adjusting member (9) cooperates with the conductive block (3) and / or the fuse part (6) so that the electrode end (4) abuts against the fuse part (6).

5. The arc fuse according to claim 4, characterized in that: The arc fuse further comprises a first bracket (7), the first bracket (7) being provided with a first mounting hole (8), the conductive block (3) being located in the first mounting hole (8) and slidingly engaged with the bracket in a direction parallel to the first direction, the electrode end (4) being able to extend out of an opening at one end of the first mounting hole (8), the adjusting member (9) being meshed and engaged in the first mounting hole (8), and the tail end of the adjusting member (9) being engaged with the conductive block (3).

6. The arc fuse according to claim 4, characterized in that: The arc fuse further comprises a spring clip rack, the spring clip rack comprising a first spring clip (13) and a second spring clip (12), the two second spring clips (12) being arranged opposite to each other, the first spring clip (13) and the two second spring clips (12) enclosing a clamping cavity, the conductive block (3) being located in the clamping cavity, the two second spring clips (12) respectively abutting against two side end surfaces of the conductive block (3), and the first spring clip (13) abutting against the conductive block (3) along a first direction.

7. The arc fuse according to claim 2, characterized in that: Along the first direction, the cross-sectional dimension of the electrode end (4) perpendicular to the first direction gradually decreases.

8. The arc fuse according to claim 5, characterized in that: The arc fuse further comprises a second bracket (10), wherein the first bracket (7) and at least a portion of the conductive sheet (5) are embedded in the bracket.

9. The arc fuse according to claim 8, characterized in that: The bracket comprises two petals, each of which is provided with a recessed portion, and the two petals are capable of cooperating so that the two recessed portions enclose a cavity (11), and the fuse portion (6) and the electrode end (4) are both located in the cavity (11).

10. A backup protection surge protector, characterized in that: Comprising the arc fuse as described in any one of claims 1-9.

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