A mechanical arc extinguishing structure

Abstract

The present invention provides a mechanical arc extinguishing structure, including a high-voltage electrode, a low-voltage electrode, a fixed arc extinguishing assembly, a rotating arc extinguishing assembly and an arc extinguishing cover. The rotating arc extinguishing assembly and the fixed arc extinguishing assembly are arranged alternately, and the rotating arc extinguishing assembly can rotate relative to the fixed arc extinguishing assembly. The fixed arc extinguishing ring, the rotating arc extinguishing ring and the arc extinguishing cover together constitute an arc extinguishing cavity. Through the relative rotation of the fixed arc extinguishing ring and the rotating arc extinguishing ring, the arc between the high-voltage electrode and the low-voltage electrode is stretched in the arc extinguishing cavity to achieve the purpose of extinguishing the arc. The present invention can be used in current interrupting devices such as high-voltage switch cabinets and circuit breakers to extinguish the continuous arc generated during the interruption process to prevent the arc from causing damage to electrical facilities. The present invention can also be used in lightning arrester products. When lightning strikes, the present invention serves as the core leakage channel of the lightning arrester. After discharging the lightning energy, the subsequent power frequency arc is effectively extinguished to achieve the dual functions of lightning protection and arc extinguishing.

Description

Technical Field

[0001] The invention relates to electrical fields such as switches and lightning protection devices, and in particular to a mechanical arc extinguishing structure. Background Art

[0002] Electrical facilities such as high-voltage switchgear and high-voltage circuit breakers have always faced the problem of difficult arc interruption and arc erosion damage to equipment. Although there are already a large number of mature related technical products in this field, from the perspective of cost and effect, continuous technological innovation is still needed to explore new technologies and products with lower costs, better working effects and environmental friendliness. Summary of the invention

[0003] In view of the arc extinguishing problem existing in the fields of high-voltage switchgear, circuit breakers and lightning protection devices, the present invention provides a mechanical arc extinguishing structure to achieve efficient arc extinguishing function.

[0004] The present invention adopts the following technical solutions:

[0005] A mechanical arc extinguishing structure is characterized in that it includes an arc extinguishing hood, in which a fixed arc extinguishing assembly and a rotating arc extinguishing assembly are arranged, the rotating arc extinguishing assembly and the fixed arc extinguishing assembly are arranged alternately, and the rotating arc extinguishing assembly can rotate relative to the fixed arc extinguishing assembly.

[0006] Preferably, a low-voltage electrode is provided in the center of the fixed arc-extinguishing assembly, and a high-voltage electrode is provided outside the arc-extinguishing cover. The arc between the high-voltage electrode and the low-voltage electrode is stretched by relative rotation of the rotating arc-extinguishing assembly and the fixed arc-extinguishing assembly to extinguish the arc.

[0007] Preferably, the fixed arc extinguishing assembly includes a plurality of concentric fixed arc extinguishing rings arranged in sequence from the inside to the outside, and the rotating arc extinguishing assembly includes a plurality of concentric rotating arc extinguishing rings arranged in sequence from the inside to the outside, the fixed arc extinguishing rings and the rotating arc extinguishing rings are arranged alternately, the fixed arc extinguishing ring is fixedly arranged between two adjacent rotating arc extinguishing rings, and the rotating arc extinguishing ring can rotate relative to the fixed arc extinguishing ring.

[0008] Preferably, the cross-sections of the fixed arc extinguishing ring and the rotating arc extinguishing ring are arcs with an arc angle greater than 180°, and the arc angles of all the fixed arc extinguishing rings and the rotating arc extinguishing rings are kept consistent.

[0009] Preferably, the arc extinguishing cover is a closed flat cylindrical structure, the arc extinguishing cover includes a first disc and a second disc, a fixed arc extinguishing ring is fixedly connected between the first disc and the second disc, a rotating arc extinguishing ring is slidably connected between the first disc and the second disc, and the rotating arc extinguishing ring can rotate and slide on the first disc and the second disc.

[0010] Preferably, the materials of the fixed arc extinguishing ring, the rotating arc extinguishing ring and the arc extinguishing cover are insulating materials such as resin, silicone rubber, epoxy board, bakelite board, diphenyl ether board or silicone board.

[0011] Preferably, the inner walls of the fixed arc extinguishing ring, the rotating arc extinguishing ring, the first disc and the second disc are all provided with grid protrusions.

[0012] Preferably, the difference between the radii of adjacent fixed arc extinguishing rings and rotating arc extinguishing rings is equal.

[0013] Preferably, the driving energy for the rotation of the rotating arc extinguishing ring comes from the arc itself, or from an external energy supply.

[0014] Preferably, the high voltage electrode and the low voltage electrode are made of stainless steel, aluminum, copper or silver.

[0015] Preferably, the high-voltage electrode is a high-voltage conductor of a transmission line, a terminal block of a switch cabinet, a high potential in an electronic circuit, or a fixture fixed to a high-voltage conductor of a transmission line, a terminal block of a switch cabinet, or a high potential in an electronic circuit.

[0016] Preferably, the low voltage electrode is led outside the arc extinguishing hood through an insulated wire.

[0017] Preferably, the penetration between the insulated conductor and the arc chute is sealed.

[0018] The present invention has the following beneficial effects:

[0019] The present invention provides a mechanical arc extinguishing structure, which stretches the arc to 5-80 times, or even higher times, of its initial length in a purely mechanical manner by rotating an arc extinguishing ring relative to a fixed arc extinguishing ring, so as to achieve the purpose of efficient arc extinguishing. The structure can be used in current breaking devices such as high-voltage switch cabinets and circuit breakers to extinguish continuous arcs generated during the breaking process to prevent the arc from damaging electrical facilities. It can also be used in lightning arrester products as a core component to form a lightning protection device with the dual functions of arc extinguishing and lightning protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the structure of the fixed arc extinguishing ring and the rotating arc extinguishing ring when the arc angle is 235°.

[0022] Figure 2 Schematic diagram of arc extinguishing hood and insulated wire.

[0023] Figure 3 It is a schematic diagram of the structure of the rotating arc extinguishing ring after rotation when the arc angle is 235°.

[0024] Figure 4 Schematic diagram of the grid protrusion structure.

[0025] Figure 5 It indicates the parameters needed to calculate the arc stretching multiple when the mechanical arc extinguishing structure is working.

[0026] Figure 6 It is a schematic diagram of the structure of the fixed arc extinguishing ring and the rotating arc extinguishing ring when the arc angle is 270°.

[0027] Figure 7 It is a schematic diagram of the structure of the rotating arc extinguishing ring after rotation when the arc angle is 270°.

[0028] 1. Low voltage electrode, 2. High voltage electrode, 3. Fixed arc extinguishing ring, 4. Rotating arc extinguishing ring, 5. Electric arc, 6. Insulated wire, 7. Arc extinguishing cover. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Example 1

[0035] Combination Figures 1 to 5 A mechanical arc extinguishing structure includes an arc extinguishing hood 7, in which a fixed arc extinguishing assembly and a rotating arc extinguishing assembly are arranged, the rotating arc extinguishing assembly and the fixed arc extinguishing assembly are arranged alternately, and the rotating arc extinguishing assembly can rotate relative to the fixed arc extinguishing assembly.

[0036] Among them, a low-voltage electrode 1 is arranged in the center of the fixed arc extinguishing assembly, and a high-voltage electrode 2 is arranged outside the arc extinguishing cover. The arc between the high-voltage electrode and the low-voltage electrode is stretched by the relative rotation of the rotating arc extinguishing assembly and the fixed arc extinguishing assembly to achieve the purpose of extinguishing the arc.

[0037] like Figure 1 As shown, the fixed arc extinguishing assembly includes a plurality of concentric fixed arc extinguishing rings 3 arranged in sequence from the inside to the outside, and the rotating arc extinguishing assembly includes a plurality of concentric rotating arc extinguishing rings 4 arranged in sequence from the inside to the outside. The fixed arc extinguishing rings and the rotating arc extinguishing rings are arranged alternately, and the fixed arc extinguishing ring is fixedly arranged between two adjacent rotating arc extinguishing rings, and the rotating arc extinguishing ring can rotate relative to the fixed arc extinguishing ring.

[0038] Specifically, the cross-sections of the fixed arc extinguishing ring 3 and the rotating arc extinguishing ring 4 are both arcs with an arc angle of 235°, and the arc angles of all the fixed arc extinguishing rings and the rotating arc extinguishing rings are consistent. Figure 1 .

[0039] The arc extinguishing cover 7 is a closed flat cylindrical structure, which includes a first disc and a second disc, a fixed arc extinguishing ring fixedly connected between the first disc and the second disc, and a rotating arc extinguishing ring slidably connected between the first disc and the second disc, and the rotating arc extinguishing ring can rotate and slide on the first disc and the second disc.

[0040] The arc extinguishing cover 7, the fixed arc extinguishing ring 3 and the rotating arc extinguishing ring 4 together form the organizational structure of the arc extinguishing chamber, and the arc between the high-voltage electrode and the low-voltage electrode is effectively extinguished in the arc extinguishing chamber.

[0041] The arc is stretched to 5-80 times of its initial length, or even higher, by a purely mechanical method by rotating the arc extinguishing ring relative to the fixed arc extinguishing ring, so as to achieve the purpose of efficient arc extinguishing. Figure 3 .

[0042] The materials of the fixed arc extinguishing ring, the rotating arc extinguishing ring and the arc extinguishing cover are insulating materials such as resin, silicone rubber, epoxy board, bakelite board, diphenyl ether board or organic silicon board.

[0043] The inner walls of the fixed arc extinguishing ring, the rotating arc extinguishing ring, the first disc and the second disc are all provided with grid protrusions to increase the creepage distance of the inner wall so that the air breakdown voltage at the same distance is smaller than the creepage breakdown voltage of the inner wall surface. Figure 4 shown.

[0044] In this embodiment, the number of fixed arc extinguishing rings 3 is 6, and the number of rotating arc extinguishing rings 4 is 7.

[0045] In fact, the number of fixed arc extinguishing rings and rotating arc extinguishing rings can be adjusted according to the breaking current, and the value range is an integer in [0,∞).

[0046] The driving energy for the rotating arc extinguishing ring to rotate comes from the arc itself or from external energy supply, which can be achieved by existing technology and will not be described in detail here.

[0047] The materials of high-voltage electrodes and low-voltage electrodes are good conductors such as stainless steel, aluminum, copper or silver.

[0048] The high-voltage electrode is a high-voltage conductor in a transmission line, a terminal block in a switch cabinet, a high potential in an electronic circuit, or a fixture fixed on a high-voltage conductor in a transmission line, a terminal block in a switch cabinet, or a high potential in an electronic circuit.

[0049] The low-voltage electrode is led to the outside of the arc extinguishing hood through an insulated wire so as to be connected to the low-voltage side of the arc being extinguished. Figure 2 shown.

[0050] The perforations between the insulated conductors and the arc extinguishing hood are tightly sealed to prevent the arc from passing through.

[0051] The difference between the radius of adjacent fixed arc extinguishing rings and the radius of the rotating arc extinguishing rings is equal.

[0052] In this example, the diameter of the low-voltage electrode 1 is d, the difference in the arc radius of all adjacent arc-extinguishing rings (including fixed arc-extinguishing rings and rotating arc-extinguishing rings) is h, the distance between the innermost ring of the rotating arc-extinguishing ring and the low-voltage electrode is also h, and the distance between the high-voltage electrode 2 and the outermost ring of the rotating arc-extinguishing ring is H. Figure 5 shown.

[0053] The arc stretching effect after the mechanical arc extinguishing structure is actuated in this example is calculated as follows.

[0054] In the initial state, if Figure 1 , the arc length is:

[0055] L1=(2a+1)h+H

[0056] Where a is the number of fixed arc extinguishing rings. In this example, a = 6, that is,

[0057] L1=(2a+1)h+H=13h+H

[0058] When the arc extinguishing structure is in the breaking state, Figure 3 , the arc length estimation formula is as follows:

[0059]

[0060] In this example, a=6, so,

[0061]

[0062]

[0063] Assume d = 4h, H = h, then we have

[0064] L1=14h,L2=105.8h

[0065] In the breaking state of the arc extinguishing structure, the arc length L2 is 7.56 times the initial arc length L1.

[0066] It can be seen from the calculation results that this example achieves a good arc extinguishing effect.

[0067] Example 2

[0068] Combination Figure 2 , Figures 4 to 7 A mechanical arc extinguishing structure includes an arc extinguishing hood 7, in which a fixed arc extinguishing assembly and a rotating arc extinguishing assembly are arranged, the rotating arc extinguishing assembly and the fixed arc extinguishing assembly are arranged alternately, and the rotating arc extinguishing assembly can rotate relative to the fixed arc extinguishing assembly.

[0069] Among them, a low-voltage electrode 1 is arranged in the center of the fixed arc extinguishing assembly, and a high-voltage electrode 2 is arranged outside the arc extinguishing cover. The arc between the high-voltage electrode and the low-voltage electrode is stretched by the relative rotation of the rotating arc extinguishing assembly and the fixed arc extinguishing assembly to achieve the purpose of extinguishing the arc.

[0070] like Figure 1 As shown, the fixed arc extinguishing assembly includes a plurality of concentric fixed arc extinguishing rings 3 arranged in sequence from the inside to the outside, and the rotating arc extinguishing assembly includes a plurality of concentric rotating arc extinguishing rings 4 arranged in sequence from the inside to the outside. The fixed arc extinguishing rings and the rotating arc extinguishing rings are arranged alternately, and the fixed arc extinguishing ring is fixedly arranged between two adjacent rotating arc extinguishing rings, and the rotating arc extinguishing ring can rotate relative to the fixed arc extinguishing ring.

[0071] Specifically, the cross-sections of the fixed arc extinguishing ring 3 and the rotating arc extinguishing ring 4 are both arcs with an arc angle of 270°, and the arc angles of all the fixed arc extinguishing rings and the rotating arc extinguishing rings are consistent. Figure 6 .

[0072] The arc extinguishing cover 7 is a closed flat cylindrical structure, which includes a first disc and a second disc, a fixed arc extinguishing ring fixedly connected between the first disc and the second disc, and a rotating arc extinguishing ring slidably connected between the first disc and the second disc, and the rotating arc extinguishing ring can rotate and slide on the first disc and the second disc.

[0073] The arc extinguishing cover 7, the fixed arc extinguishing ring 3 and the rotating arc extinguishing ring 4 together form the organizational structure of the arc extinguishing chamber, and the arc between the high-voltage electrode and the low-voltage electrode is effectively extinguished in the arc extinguishing chamber.

[0074] The arc is stretched to 5-80 times of its initial length, or even higher, by a purely mechanical method by rotating the arc extinguishing ring relative to the fixed arc extinguishing ring, so as to achieve the purpose of efficient arc extinguishing. Figure 7 .

[0075] The materials of the fixed arc extinguishing ring, the rotating arc extinguishing ring and the arc extinguishing cover are insulating materials such as resin, silicone rubber, epoxy board, bakelite board, diphenyl ether board or organic silicon board.

[0076] The inner walls of the fixed arc extinguishing ring, the rotating arc extinguishing ring, the first disc and the second disc are all provided with grid protrusions to increase the creepage distance of the inner wall so that the air breakdown voltage at the same distance is smaller than the creepage breakdown voltage of the inner wall surface. Figure 4 shown.

[0077] In this embodiment, the number of fixed arc extinguishing rings 3 is 6, and the number of rotating arc extinguishing rings 4 is 7.

[0078] In fact, the number of fixed arc extinguishing rings and rotating arc extinguishing rings can be adjusted according to the breaking current, and the value range is an integer in [0,∞).

[0079] The driving energy for the rotating arc extinguishing ring to rotate comes from the arc itself or from external energy supply, which can be achieved by existing technology and will not be described in detail here.

[0080] The materials of high-voltage electrodes and low-voltage electrodes are good conductors such as stainless steel, aluminum, copper or silver.

[0081] The high-voltage electrode is a high-voltage conductor in a transmission line, a terminal block in a switch cabinet, a high potential in an electronic circuit, or a fixture fixed on a high-voltage conductor in a transmission line, a terminal block in a switch cabinet, or a high potential in an electronic circuit.

[0082] The low-voltage electrode is led to the outside of the arc extinguishing hood through an insulated wire so as to be connected to the low-voltage side of the arc being extinguished. Figure 2 shown.

[0083] The perforations between the insulated conductors and the arc extinguishing hood are tightly sealed to prevent the arc from passing through.

[0084] The difference between the radius of adjacent fixed arc extinguishing rings and the radius of the rotating arc extinguishing rings is equal.

[0085] In this example, the diameter of the low-voltage electrode 1 is d, the difference in the arc radius of all adjacent arc-extinguishing rings (including fixed arc-extinguishing rings and rotating arc-extinguishing rings) is h, the distance between the innermost ring of the rotating arc-extinguishing ring and the low-voltage electrode is also h, and the distance between the high-voltage electrode 2 and the outermost ring of the rotating arc-extinguishing ring is H. Figure 5 shown.

[0086] The arc stretching effect after the mechanical arc extinguishing structure is actuated in this example is calculated as follows.

[0087] In the initial state, if Figure 6 , the arc length is:

[0088] L1=(2a+1)h+H

[0089] Where a is the number of fixed arc extinguishing rings. In this example, a = 6, that is,

[0090] L1=(2a+1)h+H=13h+H

[0091] When the arc extinguishing structure is in the breaking state, Figure 7 , the arc length estimation formula is as follows:

[0092]

[0093] In this example, a=6, so,

[0094]

[0095]

[0096] Assume d = 4h, H = h, then we have

[0097] L1=14h,L2=197.7h

[0098] In the breaking state of the arc extinguishing structure, the arc length L2 is 14.1 times the initial arc length L1.

[0099] It can be seen from the calculation results that this example achieves a good arc extinguishing effect.

[0100] Example 3

[0101] Combination Figure 2 , Figures 4 to 7 A mechanical arc extinguishing structure includes an arc extinguishing hood 7, in which a fixed arc extinguishing assembly and a rotating arc extinguishing assembly are arranged, the rotating arc extinguishing assembly and the fixed arc extinguishing assembly are arranged alternately, and the rotating arc extinguishing assembly can rotate relative to the fixed arc extinguishing assembly.

[0102] Among them, a low-voltage electrode 1 is arranged in the center of the fixed arc extinguishing assembly, and a high-voltage electrode 2 is arranged outside the arc extinguishing cover. The arc between the high-voltage electrode and the low-voltage electrode is stretched by the relative rotation of the rotating arc extinguishing assembly and the fixed arc extinguishing assembly to achieve the purpose of extinguishing the arc.

[0103] like Figure 1 As shown, the fixed arc extinguishing assembly includes a plurality of concentric fixed arc extinguishing rings 3 arranged in sequence from the inside to the outside, and the rotating arc extinguishing assembly includes a plurality of concentric rotating arc extinguishing rings 4 arranged in sequence from the inside to the outside. The fixed arc extinguishing rings and the rotating arc extinguishing rings are arranged alternately, and the fixed arc extinguishing ring is fixedly arranged between two adjacent rotating arc extinguishing rings, and the rotating arc extinguishing ring can rotate relative to the fixed arc extinguishing ring.

[0104] Specifically, the cross-sections of the fixed arc extinguishing ring 3 and the rotating arc extinguishing ring 4 are both arcs with an arc angle of 270°, and the arc angles of all the fixed arc extinguishing rings and the rotating arc extinguishing rings are consistent. Figure 6 .

[0105] The arc extinguishing cover 7 is a closed flat cylindrical structure, which includes a first disc and a second disc, a fixed arc extinguishing ring fixedly connected between the first disc and the second disc, and a rotating arc extinguishing ring slidably connected between the first disc and the second disc, and the rotating arc extinguishing ring can rotate and slide on the first disc and the second disc.

[0106] The arc extinguishing cover 7, the fixed arc extinguishing ring 3 and the rotating arc extinguishing ring 4 together form the organizational structure of the arc extinguishing chamber, and the arc between the high-voltage electrode and the low-voltage electrode is effectively extinguished in the arc extinguishing chamber.

[0107] The arc is stretched to 5-80 times of its initial length, or even higher, by a purely mechanical method by rotating the arc extinguishing ring relative to the fixed arc extinguishing ring, so as to achieve the purpose of efficient arc extinguishing. Figure 7 .

[0108] The materials of the fixed arc extinguishing ring, the rotating arc extinguishing ring and the arc extinguishing cover are insulating materials such as resin, silicone rubber, epoxy board, bakelite board, diphenyl ether board or organic silicon board.

[0109] The inner walls of the fixed arc extinguishing ring, the rotating arc extinguishing ring, the first disc and the second disc are all provided with grid protrusions to increase the creepage distance of the inner wall so that the air breakdown voltage at the same distance is smaller than the creepage breakdown voltage of the inner wall surface. Figure 4 shown.

[0110] In this embodiment, the number of fixed arc extinguishing rings 3 is 20, and the number of rotating arc extinguishing rings 4 is 21.

[0111] In fact, the number of fixed arc extinguishing rings and rotating arc extinguishing rings can be adjusted according to the breaking current, and the value range is an integer in [0,∞).

[0112] The driving energy for the rotating arc extinguishing ring to rotate comes from the arc itself or from external energy supply, which can be achieved by existing technology and will not be described in detail here.

[0113] The materials of high-voltage electrodes and low-voltage electrodes are good conductors such as stainless steel, aluminum, copper or silver.

[0114] The high-voltage electrode is a high-voltage conductor in a transmission line, a terminal block in a switch cabinet, a high potential in an electronic circuit, or a fixture fixed on a high-voltage conductor in a transmission line, a terminal block in a switch cabinet, or a high potential in an electronic circuit.

[0115] The low-voltage electrode is led to the outside of the arc extinguishing hood through an insulated wire so as to be connected to the low-voltage side of the arc being extinguished. Figure 2 shown.

[0116] The perforations between the insulated conductors and the arc extinguishing hood are tightly sealed to prevent the arc from passing through.

[0117] The difference between the radius of adjacent fixed arc extinguishing rings and the radius of the rotating arc extinguishing rings is equal.

[0118] In this example, the diameter of the low-voltage electrode 1 is d, the difference in the arc radius of all adjacent arc-extinguishing rings (including fixed arc-extinguishing rings and rotating arc-extinguishing rings) is h, the distance between the innermost ring of the rotating arc-extinguishing ring and the low-voltage electrode is also h, and the distance between the high-voltage electrode 2 and the outermost ring of the rotating arc-extinguishing ring is H. Figure 5 shown.

[0119] The arc stretching effect after the mechanical arc extinguishing structure is actuated in this example is calculated as follows.

[0120] Then in the initial state, the arc length is:

[0121] L1=(2a+1)h+H

[0122] Where a is the number of fixed arc extinguishing rings. In this example, a = 20, that is,

[0123] L1=(2a+1)h+H=41h+H

[0124] When the arc extinguishing structure is in the breaking state, Figure 7 , the arc length estimation formula is as follows:

[0125]

[0126] In this example, a=20, so,

[0127]

[0128]

[0129] Assume d = 4h, H = h, then we have

[0130] L1=42h,L2=1522.6h

[0131] In the breaking state of the arc extinguishing structure, the arc length L2 is 36.3 times the initial arc length L1.

[0132] It can be seen from the calculation results that this example achieves a good arc extinguishing effect.

[0133] Example 4

[0134] Combination Figure 2 , Figures 4 to 7 A mechanical arc extinguishing structure includes an arc extinguishing hood 7, in which a fixed arc extinguishing assembly and a rotating arc extinguishing assembly are arranged, the rotating arc extinguishing assembly and the fixed arc extinguishing assembly are arranged alternately, and the rotating arc extinguishing assembly can rotate relative to the fixed arc extinguishing assembly.

[0135] Among them, a low-voltage electrode 1 is arranged in the center of the fixed arc extinguishing assembly, and a high-voltage electrode 2 is arranged outside the arc extinguishing cover. The arc between the high-voltage electrode and the low-voltage electrode is stretched by the relative rotation of the rotating arc extinguishing assembly and the fixed arc extinguishing assembly to achieve the purpose of extinguishing the arc.

[0136] like Figure 1 As shown, the fixed arc extinguishing assembly includes a plurality of concentric fixed arc extinguishing rings 3 arranged in sequence from the inside to the outside, and the rotating arc extinguishing assembly includes a plurality of concentric rotating arc extinguishing rings 4 arranged in sequence from the inside to the outside. The fixed arc extinguishing rings and the rotating arc extinguishing rings are arranged alternately, and the fixed arc extinguishing ring is fixedly arranged between two adjacent rotating arc extinguishing rings, and the rotating arc extinguishing ring can rotate relative to the fixed arc extinguishing ring.

[0137] Specifically, the cross-sections of the fixed arc extinguishing ring 3 and the rotating arc extinguishing ring 4 are both arcs with an arc angle of 270°, and the arc angles of all the fixed arc extinguishing rings and the rotating arc extinguishing rings are consistent. Figure 6 .

[0138] The arc extinguishing cover 7 is a closed flat cylindrical structure, which includes a first disc and a second disc, a fixed arc extinguishing ring fixedly connected between the first disc and the second disc, and a rotating arc extinguishing ring slidably connected between the first disc and the second disc, and the rotating arc extinguishing ring can rotate and slide on the first disc and the second disc.

[0139] The arc extinguishing cover 7, the fixed arc extinguishing ring 3 and the rotating arc extinguishing ring 4 together form the organizational structure of the arc extinguishing chamber, and the arc between the high-voltage electrode and the low-voltage electrode is effectively extinguished in the arc extinguishing chamber.

[0140] The arc is stretched to 5-80 times of its initial length, or even higher, by a purely mechanical method by rotating the arc extinguishing ring relative to the fixed arc extinguishing ring, so as to achieve the purpose of efficient arc extinguishing. Figure 7 .

[0141] The materials of the fixed arc extinguishing ring, the rotating arc extinguishing ring and the arc extinguishing cover are insulating materials such as resin, silicone rubber, epoxy board, bakelite board, diphenyl ether board or organic silicon board.

[0142] The inner walls of the fixed arc extinguishing ring, the rotating arc extinguishing ring, the first disc and the second disc are all provided with grid protrusions to increase the creepage distance of the inner wall so that the air breakdown voltage at the same distance is smaller than the creepage breakdown voltage of the inner wall surface. Figure 4 shown.

[0143] In this embodiment, the number of fixed arc extinguishing rings 3 is 50, and the number of rotating arc extinguishing rings 4 is 51.

[0144] In fact, the number of fixed arc extinguishing rings and rotating arc extinguishing rings can be adjusted according to the breaking current, and the value range is an integer in [0,∞).

[0145] The driving energy for the rotating arc extinguishing ring to rotate comes from the arc itself or from external energy supply, which can be achieved by existing technology and will not be described in detail here.

[0146] The materials of high-voltage electrodes and low-voltage electrodes are good conductors such as stainless steel, aluminum, copper or silver.

[0147] The high-voltage electrode is a high-voltage conductor in a transmission line, a terminal block in a switch cabinet, a high potential in an electronic circuit, or a fixture fixed on a high-voltage conductor in a transmission line, a terminal block in a switch cabinet, or a high potential in an electronic circuit.

[0148] The low-voltage electrode is led to the outside of the arc extinguishing hood through an insulated wire so as to be connected to the low-voltage side of the arc being extinguished. Figure 2 shown.

[0149] The perforations between the insulated conductors and the arc extinguishing hood are tightly sealed to prevent the arc from passing through.

[0150] The difference between the radius of adjacent fixed arc extinguishing rings and the radius of the rotating arc extinguishing rings is equal.

[0151] In this example, the diameter of the low-voltage electrode 1 is d, the difference in the arc radius of all adjacent arc-extinguishing rings (including fixed arc-extinguishing rings and rotating arc-extinguishing rings) is h, the distance between the innermost ring of the rotating arc-extinguishing ring and the low-voltage electrode is also h, and the distance between the high-voltage electrode 2 and the outermost ring of the rotating arc-extinguishing ring is H. Figure 5 shown.

[0152] The arc stretching effect after the mechanical arc extinguishing structure in this example is calculated. This calculation is performed using an approximate method.

[0153] Then in the initial state, the arc length is:

[0154] L1=(2a+1)h+H

[0155] Where a is the number of fixed arc extinguishing rings.

[0156] When the arc extinguishing structure is in the breaking state, Figure 7 , the arc length estimation formula is as follows:

[0157]

[0158] Directly divide L2 and L1:

[0159]

[0160]

[0161] In the above formula, since a=50, The value is very small and has little impact on the result, so we make an approximate treatment and discard this item to get:

[0162]

[0163] When a=50, the arc stretching ratio is 83.4 times.

[0164] It can be seen from the calculation results that this example achieves a good arc extinguishing effect.

[0165] In addition, it can also be concluded that the arc extinguishing structure can stretch the arc by approximately 4.925+1.57a times, and by increasing the number of intermediate electrodes, it can be ensured that the arc is reliably extinguished.

[0166] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A mechanical arc extinguishing structure, characterized in that: It comprises an arc extinguishing hood, in which a fixed arc extinguishing assembly and a rotating arc extinguishing assembly are arranged, the rotating arc extinguishing assembly and the fixed arc extinguishing assembly are arranged alternately, and the rotating arc extinguishing assembly can rotate relative to the fixed arc extinguishing assembly; A low-voltage electrode is arranged in the center of the fixed arc-extinguishing assembly, and a high-voltage electrode is arranged outside the arc-extinguishing cover. The arc between the high-voltage electrode and the low-voltage electrode is stretched by the relative rotation of the rotating arc-extinguishing assembly and the fixed arc-extinguishing assembly to extinguish the arc; The fixed arc extinguishing assembly includes a plurality of concentric fixed arc extinguishing rings arranged in sequence from the inside to the outside, and the rotating arc extinguishing assembly includes a plurality of concentric rotating arc extinguishing rings arranged in sequence from the inside to the outside. The fixed arc extinguishing rings and the rotating arc extinguishing rings are arranged alternately, and the fixed arc extinguishing ring is fixedly arranged between two adjacent rotating arc extinguishing rings, and the rotating arc extinguishing ring can rotate relative to the fixed arc extinguishing ring.

2. A mechanical arc extinguishing structure according to claim 1, characterized in that: The cross-sections of the fixed arc extinguishing ring and the rotating arc extinguishing ring are both arcs with an arc angle greater than 180°, and the arc angles of all the fixed arc extinguishing rings and the rotating arc extinguishing rings are consistent.

3. A mechanical arc extinguishing structure according to claim 1, characterized in that: The arc extinguishing cover is a closed flat cylindrical structure, which includes a first disc and a second disc. A fixed arc extinguishing ring is fixedly connected between the first disc and the second disc, and a rotating arc extinguishing ring is slidably connected between the first disc and the second disc. The rotating arc extinguishing ring can rotate and slide on the first disc and the second disc.

4. A mechanical arc extinguishing structure according to claim 1, characterized in that: The materials of the fixed arc extinguishing ring, the rotating arc extinguishing ring and the arc extinguishing cover are insulating materials such as resin, silicone rubber, epoxy board, bakelite board, diphenyl ether board or organic silicon board.

5. A mechanical arc extinguishing structure according to claim 3, characterized in that: The inner walls of the fixed arc extinguishing ring, the rotating arc extinguishing ring, the first disc and the second disc are all provided with grid protrusions.

6. A mechanical arc extinguishing structure according to claim 1, characterized in that: The difference between the radius of adjacent fixed arc extinguishing rings and the radius of the rotating arc extinguishing rings is equal.

7. A mechanical arc extinguishing structure according to claim 1, characterized in that: The driving energy for the rotating arc extinguishing ring comes from the arc itself or from external energy supply.

8. The mechanical arc extinguishing structure according to claim 1, characterized in that: The high voltage electrode and the low voltage electrode are made of stainless steel, aluminum, copper or silver.

9. The mechanical arc extinguishing structure according to claim 1, characterized in that: The high-voltage electrode is a high-voltage conductor of a transmission line, a terminal block of a switch cabinet, a high potential in an electronic circuit, or a fixture fixed on a high-voltage conductor of a transmission line, a terminal block of a switch cabinet, or a high potential in an electronic circuit.

10. The mechanical arc extinguishing structure according to claim 1, characterized in that: The low-voltage electrode is led to the outside of the arc extinguishing hood through an insulated wire.

11. A mechanical arc extinguishing structure according to claim 10, characterized in that: The perforations between the insulated conductor and the arc extinguishing hood are sealed.

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