Fuse and backup protection surge protector

Abstract

The utility model relates to the field of surge protector equipment, in particular to a fuse and a backup protection surge protector. The fuse provided by the utility model is used for backup protection of a surge protector body, and comprises an electric arc member and a fusing member, the fusing member is used for being connected with the surge protector body in series, the electric arc member is matched with the fusing member, and the electric 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 fuse can be improved.

Description

Technical Field

[0001] The utility model relates to the field of surge protector equipment, in particular to a 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 a fuse that can improve the ability of the fuse to withstand impact current;

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

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

[0006] Furthermore, the fuse element includes a fuse part, and the arc element includes an electrode end. In a first direction from the electrode end to the fuse part, the electrode end and the fuse part are matched along a gap, and an arc is generated between the electrode end and the fuse part to melt the fuse part.

[0007] 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.

[0008] Furthermore, along the first direction, the cross-sectional dimension of the electrode terminal perpendicular to the first direction gradually decreases.

[0009] Furthermore, the fuse portion includes a first fuse segment and a second fuse segment, and in a direction opposite to the first direction, a spacing dimension between the first fuse segment and the second fuse segment along a direction perpendicular to the first direction gradually decreases until the first fuse segment and the second fuse segment are connected.

[0010] Furthermore, along the first direction, the cross-sectional dimension of the electrode end perpendicular to the first direction gradually decreases; the fuse portion includes a first fuse section and a second fuse section, and along the direction opposite to the first direction, the spacing dimension between the first fuse section and the second fuse section along the direction perpendicular to the first direction gradually decreases until they are connected.

[0011] Furthermore, the fuse further comprises a bracket, and at least a portion of the conductive block and the conductive sheet are embedded in the bracket.

[0012] Furthermore, a slot body is provided on the bracket, a copper bar is embedded in the slot body, and one end of the conductive block away from the conductive sheet is embedded in the slot body and abuts against the copper bar.

[0013] Furthermore, the 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 in the tube body, and the two ends of the conductive sheet extend out of the tube body through the windows on the fuse caps.

[0014] The utility model provides a backup protection surge protector, comprising the fuse as described in any one of the above items.

[0015] Beneficial Effects

[0016] 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 fuse through the surge protector body, and the fuse element in the fuse melts due to self-heating. In the fuse of 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 element heats up as a whole, the arc in this solution acts on a specific position of the fuse element, 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 element with a higher rated temperature can be selected to avoid the impact current from disconnecting the circuit in the fuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 This is an overall schematic diagram of the fuse provided in the first embodiment of the utility model;

[0019] Figure 2 It is a partial structural schematic diagram provided by the first embodiment of the utility model;

[0020] Figure 3 It is a partial structural schematic diagram provided by the second embodiment of the present utility model.

[0021] Figure numbers: 1-arc piece; 2-fuse piece; 3-fuse part; 4-conductive sheet; 5-electrode end; 6-conductive block; 7-bracket; 8-copper busbar; 9-first fuse section; 10-second fuse section; a-first direction. DETAILED DESCRIPTION

[0022] 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.

[0023] Embodiment 1

[0024] like Figure 1 and Figure 2A 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.

[0025] 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, thereby preventing 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 fusing, 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. 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 fuse through the surge protector body, and the fuse wire in the fuse melts due to self-heating. In the 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 wire heats up 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 fuse.

[0026] In an optional embodiment, the fuse 2 includes a fuse part 3, and the arc part 1 includes an electrode end 5. In a first direction a from the electrode end 5 to the fuse part 3, the electrode end 5 and the fuse part 3 are matched along a gap, and an arc is generated between the electrode end 5 and the fuse part 3 to melt the fuse part 3.

[0027] The first connection end and the second connection end of the fuse 2 are respectively connected to the lightning protection circuit, and the fuse part 3 is located between the first connection end and the second connection end. When the fuse part 3 blows, the part between the first connection end and the second connection end of the fuse 2 can be disconnected, so that the lightning protection circuit is disconnected.

[0028] The electrode end 5 of the arc piece 1 and the fuse end of the fuse 2 are the two poles of the arc respectively. Compared with the ignition electrode in the traditional scheme, which includes the first electrode and the second electrode, the ends of the first electrode and the second electrode are respectively located on both sides of the fuse. When the control circuit where the first electrode and the second electrode are located is energized, an arc appears in the gap between the first electrode and the second electrode, and the arc melts the fuse. Since the fuse is located between the first electrode and the second electrode, the gap between the first electrode and the second electrode is wide, resulting in a larger overall size of the fuse. An arc is formed between the fuse 2 and the arc piece 1 in this scheme, and an arc is formed between the electrode end 5 and the fuse part 3. The electrode end 5 and the fuse part 3 can be made of materials with different rated temperatures or different sizes, so that the electrode end 5 is less affected by the arc than the fuse part 3, and the fuse 2 is melted under the arc. The gap formed by the arc in this scheme is smaller than the gap in the traditional scheme, the overall size of the fuse is reduced, and the energy loss when the arc passes is reduced.

[0029] Specifically, the electrode end 5 and the fuse part 3 are gap-matched along the first direction a, that is, the electrode end 5 and the fuse end are respectively located at the two ends of the gap along the first direction a, and the width of the gap along the first direction a is equal to the distance between the end of the electrode end 5 and the end of the fuse end.

[0030] Preferably, the gap between the electrode end 5 and the fuse part 3 is about 0.1 mm to maintain the arc. The fuse part 3 is a portion of the fuse 2 where the thickness or width is smaller, so as to facilitate arc fusing, or the rated temperature of the material at the fuse part 3 is lower than the rated temperature of the material at other positions of the fuse 2, so that the fuse part 3 melts and the first connection end and the second connection end of the fuse 2 are broken.

[0031] In an optional embodiment, the fuse 2 also includes a conductive sheet 4, which is used to be connected in series with the lightning protection circuit, and the fuse part 3 is located on the conductive sheet 4; the arc component 1 also includes a conductive block 6, which is arranged to be spaced apart from the conductive sheet 4 along the first direction a, and the conductive block 6 is electrically connected to the lightning protection circuit through a switch component, and the electrode end 5 is located on the conductive block 6.

[0032] The conductive sheet 4 is a metal sheet, and the two ends of the conductive sheet 4 are respectively a first connection end and a second connection end. A number of weakened sections with smaller widths are arranged at intervals in the direction from the first connection end to the second connection end, and one of the weakened sections cooperates with the electrode end 5 to form the fuse part 3. The conductive block 6 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 part 3 to form the electrode end 5, which is a tip structure, and an arc is generated between the electrode end 5 and the fuse part 3 through the principle of tip discharge.

[0033] In an optional embodiment, along the first direction a, the cross-sectional dimension of the electrode end 5 perpendicular to the first direction a gradually decreases.

[0034] The cross section of the electrode terminal 5 is triangular or trapezoidal.

[0035] In an optional implementation, the fuse further includes a bracket 7 , and at least a portion of the conductive block 6 and the conductive sheet 4 are embedded in the bracket 7 .

[0036] In an optional embodiment, a slot is provided on the bracket 7 , a copper bar 8 is embedded in the slot, and one end of the conductive block 6 away from the conductive sheet 4 is embedded in the slot and abuts against the copper bar 8 .

[0037] In an optional embodiment, the fuse also includes a tube body and two fuse caps, which are respectively arranged at the openings at both ends of the tube body and are sleeved with the tube body. The bracket 7 is located in the tube body, and the two ends of the conductive sheet 4 extend out of the tube body through the windows on the fuse caps.

[0038] Embodiment 2

[0039] like Figure 3 The fuse portion 3 shown includes a first fuse section 9 and a second fuse section 10. In a direction opposite to the first direction a, the spacing between the first fuse section 9 and the second fuse section 10 along a direction perpendicular to the first direction a gradually decreases until they are connected.

[0040] The fuse part 3 is a tip structure formed by bending a metal sheet, that is, the first fuse section 9 and the second fuse section 10 are formed by bending a metal sheet, and the connection between the first fuse section 9 and the second fuse section 10 is the end of the tip structure, which is closest to the fuse part 3, and the cross section of the tip structure formed by bending the first fuse section 9 and the second fuse section 10 is a trapezoid or a triangle. The fuse part 3 generates an arc with the electrode end 5 through the principle of tip discharge, and the tip structure is formed by bending a metal sheet, which ensures that the plate thickness of the fuse part 3 is consistent with the plate thickness of the metal sheet at other positions of the conductive sheet 4, thereby ensuring its fusing effect under the action of the arc.

[0041] Embodiment 3

[0042] In an optional embodiment, along the first direction a, the cross-sectional dimension of the electrode end 5 perpendicular to the first direction a gradually decreases; the fuse part 3 includes a first fuse section 9 and a second fuse section 10, and along the direction opposite to the first direction a, the spacing dimension between the first fuse section 9 and the second fuse section 10 along the direction perpendicular to the first direction a gradually decreases until they are connected.

[0043] The tip structure formed by the electrode terminal 5 and the tip structure formed by the fuse part 3 are arranged opposite to each other. Specifically, the conductive sheet 4 is a metal sheet, and the fuse part 3 is a tip structure formed by bending the metal sheet, that is, the first fuse section 9 and the second fuse section 10 are formed by bending the metal sheet, and the connection between the first fuse section 9 and the second fuse section 10 is the end of the tip structure, which is closest to the fuse part 3. The cross section of the tip structure formed by bending the first fuse section 9 and the second fuse section 10 is a trapezoidal or triangular shape. The conductive block 6 is a carbon electrode, and the carbon electrode protrudes near the fuse part 3 to form the electrode terminal 5. The electrode terminal 5 is a tip structure, and an arc is generated between the fuse part 3 through the principle of tip discharge.

[0044] Embodiment 4

[0045] The utility model provides a backup protection surge protector, comprising any one of the above-mentioned fuses.

[0046] 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.

[0047] 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.

[0048] 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, and 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 5 of the arc component 1 and the fuse part 3 on the fuse component 2. The arc heats the fuse part 3 to melt it, and then the fuse component 2 is blown. 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, and the arc between the electrode end 5 of the arc component 1 and the fuse part 3 on the fuse component 2 disappears.

[0049] 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.

[0050] 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. A fuse for backup protection of a surge protector body, characterized in that: The invention comprises an arc 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 arc component (1) cooperates with the fuse component (2), and the arc 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), so that the lightning protection circuit is disconnected; The fuse (2) comprises a fuse part (3), and the arc part (1) comprises an electrode end (5). In a first direction (a) from the electrode end (5) to the fuse part (3), the electrode end (5) and the fuse part (3) are matched along a gap, and an arc is generated between the electrode end (5) and the fuse part (3) to melt the fuse part (3).

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

3. The fuse according to claim 2, characterized in that: Along the first direction (a), the cross-sectional dimension of the electrode end (5) perpendicular to the first direction (a) gradually decreases.

4. The fuse according to claim 3, characterized in that: The fuse section (3) comprises a first fuse section (9) and a second fuse section (10), and in a direction opposite to the first direction (a), the spacing between the first fuse section (9) and the second fuse section (10) along a direction perpendicular to the first direction (a) gradually decreases until they are connected.

5. The fuse according to claim 2, characterized in that: In a first direction (a), the cross-sectional dimension of the electrode end (5) perpendicular to the first direction (a) gradually decreases; the fuse portion (3) comprises a first fuse section (9) and a second fuse section (10); in a direction opposite to the first direction (a), the spacing dimension between the first fuse section (9) and the second fuse section (10) perpendicular to the first direction (a) gradually decreases until they are connected.

6. The fuse according to claim 2, characterized in that: The fuse also includes a bracket (7), and at least a portion of the conductive block (6) and the conductive sheet (4) are embedded in the bracket (7).

7. The fuse according to claim 6, characterized in that: The bracket (7) is provided with a slot body, a copper bar (8) is embedded in the slot body, and one end of the conductive block (6) away from the conductive sheet (4) is embedded in the slot body and abuts against the copper bar (8).

8. The fuse according to claim 7, characterized in that: The 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 (7) is located in the tube body, and the two ends of the conductive sheet (4) extend out of the tube body through windows on the fuse caps.

9. A backup protection surge protector, characterized in that: Comprising the fuse as described in any one of claims 1-8.

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