CN209929246U

CN209929246U - Terminal cover of circuit breaker

Info

Publication number: CN209929246U
Application number: CN201921124772.0U
Authority: CN
Inventors: 管瑞良; 陈志刚; 顾建青
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2019-07-17
Filing date: 2019-07-17
Publication date: 2020-01-10
Anticipated expiration: 2029-07-17

Abstract

A terminal cover of a circuit breaker belongs to the technical field of low-voltage electrical appliances. The circuit breaker include circuit breaker body and the terminal cover that engages with the circuit breaker body, the terminal cover have towards the circuit breaker body and with the opening of circuit breaker body engagement, the electric arc that produces in the circuit breaker body gets into inside the terminal cover through the opening of terminal cover, its characterized in that: and a first wire mesh plate, a supporting piece and a second wire mesh plate are sequentially arranged in the terminal cover along the advancing direction of the electric arc, and a cavity is arranged between the supporting piece and the second wire mesh plate. The advantages are that: the impact of the arc sprayed out of the arc extinguishing chamber on the deionization device in the terminal cover can be prevented, so that the deionization device is prevented from being excessively deformed.

Description

Terminal cover of circuit breaker

Technical Field

The utility model belongs to the technical field of low-voltage apparatus, concretely relates to terminal cover of circuit breaker.

Background

The low-voltage molded case circuit breaker is widely applied in the photovoltaic combiner box, along with the continuous improvement of the demand of photovoltaic power generation on the rated working voltage of the molded case circuit breaker, the market demands on the high-voltage and high-breaking-capacity molded case circuit breaker more and more urgently, however, the flashover distance in the breaking process of the low-voltage molded case circuit breaker under the high voltage is longer under the lower voltage, and the safe application of the molded case circuit breaker in the photovoltaic combiner box is unfavorable.

The prior art solves the safety problem caused by flashover when a molded case circuit breaker in a photovoltaic combiner box is disconnected from three directions generally: 1) and the arc extinguishing system is optimized to reduce the arcing distance. But the method is difficult to completely solve the problem of arcing at present. 2) A filtering device is added at the exhaust port of the circuit breaker to eliminate flashover. Although the scheme can greatly reduce the flashover distance, the defects of cost increase and the like exist at the same time. 3) And the terminal cover is added, so that the flashover is isolated from the main loop, the height of the circuit breaker in the incoming and outgoing line direction is increased, the flashover distance is smaller than the height of the terminal, and zero flashover is realized. At present, the three methods are used for solving the problem of arc flashover in the breaking process of the low-voltage molded case circuit breaker under the condition of high voltage, wherein the method for increasing the terminal cover is most widely applied, and is relatively most effective due to small implementation difficulty, but the internal parts of the existing terminal cover have insufficient strength under the condition of high voltage, so that the ideal arc extinction effect is not achieved, and a continuous improvement place exists.

Disclosure of Invention

The utility model aims to provide a terminal cover of circuit breaker, it has the excellent effect of dissociating that disappears.

The utility model discloses a task is accomplished like this, a terminal cover of circuit breaker, the circuit breaker include the circuit breaker body and with the terminal cover of circuit breaker body coupling, the terminal cover have towards the circuit breaker body and with the opening that the circuit breaker body coupled, this internal electric arc that produces of circuit breaker gets into inside the terminal cover via the opening of terminal cover inside the terminal cover inside and along the advancing direction of electric arc arranged first wire mesh board, support piece, second wire mesh board in proper order, be equipped with the cavity between support piece and second wire mesh board.

In a specific embodiment of the present invention, the first wire mesh plate and the second wire mesh plate are metal braided fabrics, and the metal braided fabrics are cross structures formed by tightly braiding mutually parallel and spaced straight wire and wave wire or cross structures formed by tightly braiding mutually spaced wave wire and wave wire.

In another specific embodiment of the present invention, the first wire mesh sheet and the second wire mesh sheet each have an air permeability of more than 30%.

In another specific embodiment of the present invention, the supporting member is made of a non-deformable metal material or an insulating material, and has an air permeability greater than 50%.

In another specific embodiment of the present invention, the terminal cover includes an outer arc-isolating cover, the outer arc-isolating cover include two face-to-face parallel arrangement's each other side panel, be located the top of two side panels and be used for connecting the roof of two side panels and a back plate of keeping away from this end of body of circuit breaker of connecting the two side panels and the two side panels between the phase separation board that the interval set up, the phase separation board with two side panels parallel and the height of this phase separation board suit with two side panels, the phase separation board separate into the cavity that the number equals with the utmost point number of circuit breaker body with the inner chamber of outer arc-isolating cover in the relative direction of two side panels.

The utility model discloses a still have a concrete embodiment, correspond on the chamber wall of every cavity and be provided with the first guide way that is used for inserting to join in marriage first wire mesh board, adjacent and lie in the second guide way that is used for inserting to join in marriage support piece and is used for inserting to join in marriage the third guide way that is used for inserting to join in marriage second wire mesh board of keeping away from terminal cover opening one side of first guide way with first guide way, second guide way and third guide way branch are located the both sides of cavity.

The utility model discloses a and then a concrete embodiment, the terminal cover still include interior arc-insulating cover, the quantity of interior arc-insulating cover with the quantity of cavity equals and fixes in the cavity, interior arc-insulating cover include two curb plates face to face parallel arrangement each other, be located between the board of both sides and be on a parallel with the isolation insulation board of roof, both sides board respectively with the chamber wall of cavity cooperatees, keep apart the insulation board and separate into the cavity and be located the wiring row installation cavity of the free chamber that disappears of keeping apart the insulation board top and being located isolation insulation board below.

In a more specific embodiment of the present invention, the cavity wall of the deionization cavity is correspondingly provided with a first guide groove for inserting and matching the first wire mesh plate, a second guide groove adjacent to the first guide groove and located on one side of the first guide groove away from the terminal cover opening for inserting and matching the support member, and a third guide groove for inserting and matching the second wire mesh plate, wherein the second guide groove and the third guide groove are respectively located on two sides of the cavity.

In yet another specific embodiment of the present invention, the top plate of the outer arc-insulating cover is provided with a positioning rib in a protruding manner in a direction toward the bottom plate, and a corresponding embedding groove is provided on the two side plates of the inner arc-insulating cover.

The utility model discloses a still more and a concrete embodiment, protruding at least one rectangular arch that extends along the vertical direction of outer arc-insulating cover that is equipped with respectively on the face that side board and looks division board are relative or on the face that two looks division boards are relative correspond the concave rectangular recess that is equipped with in rectangular bellied position respectively on the both sides board of inner arc-insulating cover, through the cooperation of rectangular arch and rectangular recess, make it inserts in the cavity on vertical direction to inner arc-insulating cover, the position of rectangular recess on the curb plate of both sides is corresponding with the position of cavity, and the fitting groove is located the upper portion of rectangular recess and is close to the one end of second guide way.

The utility model discloses owing to adopted above-mentioned structure, the beneficial effect who has: the circuit breaker terminal cover comprises a circuit breaker terminal cover, a first wire mesh plate, a support piece and a second wire mesh plate, wherein the first wire mesh plate, the support piece and the second wire mesh plate are sequentially arranged in the circuit breaker terminal cover in the advancing direction of an electric arc; secondly, in the advancing direction of the electric arc, a cavity is arranged at the rear part of the supporting piece and used for cooling the deionization gas passing through the first wire mesh plate; thirdly, the supporting piece prevents the first wire mesh plate from being deformed to occupy the cavity, so that the cooling effect is ensured; and fourthly, arranging a second wire mesh plate behind the cavity for further deionizing the deionizing gas passing through the first wire mesh plate, and preventing the deionizing gas from influencing the external environment.

Drawings

Fig. 1 is the terminal cover and circuit breaker body assembly completion schematic diagram.

Fig. 2 is a schematic view of one side of the terminal cover and the circuit breaker body in the assembling process.

Fig. 3 is the opposite side schematic view of terminal cover and circuit breaker body assembling process.

Fig. 4 is a schematic diagram of the circuit breaker body of the present invention.

Fig. 5 is a schematic view of the terminal cover of the present invention.

Fig. 6 is an inverted schematic view of the outer arc-isolating cover of the terminal cover of the present invention.

Fig. 7 is a schematic view of one side of the inner arc-isolating cover of the terminal cover of the present invention.

Fig. 8 is another schematic view of the inner arc-isolating cover of the terminal cover of the present invention.

Fig. 9 is an assembly diagram of the first and second wire mesh plates and the supporting member in the inner arc-isolating cover of the present invention.

Fig. 10 is a schematic structural view of the first and second wire mesh plates and the supporting member according to the present invention.

In the figure: 1. the terminal cover comprises a terminal cover, 101, an elongated protrusion, 1011, a second mounting hole, 102, a positioning hole groove, 11, an outer arc isolation cover, 110, a cavity, 111, a side plate, 112, a top plate, 1121, a positioning rib, 113, a rear plate, 1131, an exhaust port, 1132, a knockdown plate, 114, a phase separation plate, 115, a mounting rib, 116, a first mounting hole, 117, a protrusion, 12, an inner arc isolation cover, 121, a side plate, 1211, a first guide groove, 1212, a second guide groove, 1213, a third guide groove, 1214, a fitting groove, 122, an elongated groove, 123, a positioning protrusion, 124, a reinforcing rib, 125, an isolation insulation plate, 1251, a deionization cavity, 1252, a wiring row mounting cavity, 126, an upper wall, 13, deionization devices, 131, a first wire mesh plate, 132, a support, 1321, a reinforcing body, 133, a second wire mesh plate, 134 and a cavity; 2. the circuit breaker comprises a circuit breaker body, 21. an installation groove, 22. screw holes, 23. holes, 24. a wiring bar and 25. an arc extinguish chamber air outlet; 3. a base plate, 31, a nut; 4. a first screw, 5. a second screw.

Detailed Description

The following detailed description is given by way of example with reference to the accompanying drawings, but the description of the embodiments is not intended to limit the technical solutions of the present invention, and any equivalent changes made according to the inventive concept, which are merely formal and insubstantial, should be considered as the technical solutions of the present invention.

As shown in fig. 1 to 4, the utility model relates to a terminal cover of circuit breaker, the circuit breaker include terminal cover 1, circuit breaker body 2, bottom plate 3. The terminal cover 1 and the breaker body 2 are both fixed on the bottom plate 3. The circuit breaker body 2 include explosion chamber gas outlet 25 and the wiring row 24 that is located explosion chamber gas outlet 25 below, the sound contact separation back of circuit breaker produces electric arc, electric arc gas is from explosion chamber gas outlet 25 blowout.

As shown in fig. 2, 3, 5, and 6, the terminal cover 1 includes an outer arc-insulating cover 11, an inner arc-insulating cover 12 disposed in the outer arc-insulating cover 11, and an deionization device 13 disposed in the inner arc-insulating cover 12, where the outer arc-insulating cover 11 includes two side panels 111 disposed in parallel and facing each other, a top plate 112 located on the upper portions of the two side panels 111 and connecting the two side panels 111, and a rear plate 113 connecting the two side panels 111 and far from the end of the circuit breaker body 2, so that the outer arc-insulating cover 11 is parallelepiped-shaped and forms an opening facing the circuit breaker body 2 toward one side of the arc-extinguishing chamber air outlet 25, and thus a cavity is formed inside the outer arc-insulating cover 11. The circuit breaker body 2 and the outer arc-isolating cover 11 are fixed on the bottom plate 3, the opening of the outer arc-isolating cover 11 facing the circuit breaker body 2 is connected with the circuit breaker body 2, and electric arcs generated in the circuit breaker body 2 enter the terminal cover 1 through the opening. The rear plate 113 is provided with an exhaust port 1131 corresponding to the arc extinguish chamber air outlet 25 for communicating the inside of the cavity of the outer arc shield 11 with the outside, and a knock-down plate 1132 is provided corresponding to the wiring bar 24.

As shown in fig. 5 to 9, a separating plate 114 is disposed in the cavity of the outer arc-isolating cover 11 and between the two side panels 111 at an interval, the separating plate 114 is parallel to the two side panels 111 and the height of the separating plate 114 is adapted to the side panels 111, the separating plate 114 divides the inner cavity of the outer arc-isolating cover 11 into a plurality of chambers 110 corresponding to each pole of the breaker body 2 in the direction (width direction) opposite to the two side panels 111, the number of the chambers 110 is equal to the number of the poles of the breaker body 2, and the number of the inner arc-isolating covers 12 is equal to the number of the chambers 110 and is disposed in the chambers 110.

As shown in fig. 5 to 9, the inner arc-isolating cover 12 includes two side plates 121 facing each other and disposed in parallel, and an isolating insulating plate 125 disposed between the two side plates 121 and parallel to the top plate 112, where the two side plates 121 respectively cooperate with the cavity wall of the chamber 110. Each of the chambers 110 is partitioned by the insulating isolation plate 125, so that a deionization chamber 1251 located above the insulating isolation plate 125 and a terminal block mounting chamber 1252 located below the insulating isolation plate 125 are formed at both sides of the insulating isolation plate 125. A rib 124 for connecting the two side plates 121 is provided between one ends of the two side plates 121 facing the rear plate 113, a positioning protrusion 123 is provided on the surface of the rib 124 facing the rear plate 113 in a protruding manner, and the rib 124 is attached to the rear plate 113. A positioning hole slot 102 is formed on the rear plate 113 at a position corresponding to the positioning protrusion 123, and the positioning protrusion 123 is fitted in the positioning hole slot 102. An upper wall 126 for connecting the two side plates 121 is formed between the upper opposite sides of the two side plates 121 facing the top plate 112, and a distance is kept between the side surface of the upper wall 126 facing the rear plate 113 and the rear plate 113.

As shown in fig. 8 and 9, the reinforcing ribs 124 may be provided in a plurality of strips at positions corresponding to the deionization chamber 1251. In this embodiment, three reinforcing ribs 124 are provided to form a "japanese" shape, and the positioning protrusion 123 is provided on the middle reinforcing rib 124.

As shown in fig. 7 and 8, a first guide groove 1211, a second guide groove 1212 and a third guide groove 1213 are further provided on the opposite surfaces of the two side plates 121 of the inner arc-insulating cover 12, i.e., on the wall of the deionization chamber 1251, and the three guide grooves extend in parallel to each other from the ends of the two side plates 121 close to the top plate 112 and not provided with the upper wall 126 to the position of the insulating plate 125 in the vertical direction.

As shown in fig. 7 to 10, the deionization apparatus 13 comprises a first wire mesh plate 131, a support member 132, and a second wire mesh plate 133 in this order. The first wire mesh plate 131 and the second wire mesh plate 133 are both metal braids, the metal braids are cross structures formed by tightly weaving straight wires and wave-shaped wires which are parallel to each other and spaced apart, or cross structures formed by tightly weaving wave-shaped wires and wave-shaped wires, and specifically, the wave-shaped wires extend in a direction perpendicular to the straight wires or two groups of wave-shaped wires extend perpendicular to each other. The air permeability of the first wire mesh plate 131 and the second wire mesh plate 133 is more than 30%, wherein the air permeability refers to the ratio of the area of the air-permeable holes to the whole area of the part. The supporting member 132 is made of a metal material or an insulating material that is not easily deformed, and plays a supporting role, in order to allow the free gas to pass through, in this embodiment, the supporting member 132 and the first wire mesh plate 131 have the same outer dimension, and are substantially frame-shaped, and a reinforcing member 1321 vertically extends in a central portion to play a supporting role. However, the support member 132 of the present invention is not limited to the above structure, and may have any shape as long as it can support and ensure the passage of the dissociated gas, and has a gas permeability of more than 50%. The opening of the arc chute 1 is oriented to the front, and the "h-shaped rib 124 is oriented to the rear, and the direction from the front to the rear is the arc traveling direction of the arc discharged from the arc chute air outlet 25, as shown in fig. 7. The first guide groove 1211 is located at the front, closest to the upper wall 126, and a plurality of layers of the first wire mesh plate 131 are inserted, and the support member 132 is inserted into the second guide groove 1212 adjacent to the first guide groove 1211, so that when the arc impacts the first wire mesh plate 131, the support member 132 supports the first wire mesh plate 131 in front of the first wire mesh plate to prevent the first wire mesh plate 131 from being excessively deformed under the impact. The first guide groove 1211 may be provided with a plurality of grooves having the same groove width, and one or more first wire mesh plates 131 may be inserted into each first guide groove 1211. Of course, the first guide groove 1211 may be provided with only one groove having a relatively wide groove width for inserting the plurality of first wire mesh plates 131. The second guide groove 1212 may have the same groove width as the first guide groove 1211 for inserting the support member 132. The third guide groove 1313 is formed at the rearmost portion of the inner arc-insulating cover 12 and adjacent to the rib 124, or only one groove with a relatively wide groove width may be formed for inserting and fitting the plurality of layers of the second wire mesh plates 133, and since it is adjacent to the rib 124, the second wire mesh plates 133 inserted and fitted in the third guide groove 1213 may be supported by the rib 124 if they are deformed. The width dimension of the second wire mesh plate 133 is equal to or smaller than the width of the first wire mesh plate 131, in this embodiment, the width dimension of the second wire mesh plate 133 is preferably smaller than the width of the first wire mesh plate 131. Between the support 132 and the second wire mesh sheet 133 a cavity 134 is provided, i.e. said cavity 134 is located between the second guide groove 1212 and the third guide groove 1213 for cooling the gas after the deionization of the first wire mesh sheet 131.

As shown in fig. 2, fig. 3, fig. 4, and fig. 6, two side panels 111 and/or the phase partition 114 of the outer arc-isolating cover 11 are provided with mounting ribs 115 along the vertical direction on the end portion near the side of the circuit breaker 2, and the mounting ribs 115 are in snap fit with the mounting grooves 21 on the circuit breaker body 2, so as to connect the terminal cover 1 and the circuit breaker body 2. The terminal cover 1 is provided with a first mounting hole 116 at one end facing the circuit breaker body 2, a screw hole 22 is opened at one end of the circuit breaker body 2 facing the terminal cover 1, and the first mounting hole 116 and the screw hole 22 are fastened through a first screw 4.

As shown in fig. 6 to 9, at least one elongated protrusion 101 extending in the vertical direction of the outer arc-isolating cover 11 is respectively protruded on two opposite side walls of the chamber 110, that is, on the opposite surfaces of the side panel 111 and the partition 114 or on the opposite surfaces of the two partition 114, elongated grooves 122 are respectively recessed on two side panels 121 of the inner arc-isolating cover 12 corresponding to the elongated protrusions 101, and the inner arc-isolating cover 12 is inserted into the chamber 110 in the vertical direction by the engagement of the elongated protrusions 101 and the elongated grooves 122. In this embodiment, the side panel 111 and the partition plate 114 are respectively provided with a cylinder, the cylindrical surface on the surface of the side panel 111 opposite to the partition plate 114 or on the surface of the partition plate 114 opposite to the partition plate is used as the long protrusion 101, and the cylinder is internally provided with a second mounting hole 1011. In this embodiment, eight cylindrical elongated protrusions 101 are illustrated, and two elongated protrusions 101 of the two side panels 111 near the rear panel 113 and/or two elongated protrusions 101 of the partition 114 near the rear panel 113 may be omitted. Of course, the position of the elongated protrusion 101 on the side panel 111 or the partition 114 may also be changed, the elongated protrusion 101 is located at the end of the side panel 111 and the partition 114 close to the rear panel 113, or at the end of the side panel 111 and the partition 114 far from the rear panel 113, or at the middle position of the side panel 111 and the partition 114, in this embodiment, since the positioning protrusion 123 is disposed on the rib 124 between the ends of the two side panels 121 facing the rear panel 113, and the positioning hole 102 is disposed on the rear panel 113, it is preferable that the matching structure of the elongated protrusion 101 and the elongated groove 122 is disposed at the position of the matching structure far from the positioning protrusion 123 and the positioning hole 102, that is, the elongated protrusion 101 is disposed at the end of the side panel 111 close to the circuit breaker body 2, and the elongated groove 122 is disposed at the end of the side panel 121 close to the circuit breaker body 2. The terminal cover 1 be provided with four at least second mounting holes 1011, circuit breaker body 2 bottom is provided with bottom plate 3, bottom plate 3 on correspond the position with second mounting hole 1011 and be provided with nut 31, when terminal cover 1 installed in place, thereby second mounting hole 1011 and nut 31 pass through second screw 5 fastening fit and fix terminal cover 1 and bottom plate 3.

As shown in fig. 6 to 9, the top plate 112 of the outer arc-isolating cover 11 is provided with a positioning rib 1121 protruding toward the bottom plate 3, and the corresponding side plates 121 on both sides of the inner arc-isolating cover 12 are provided with an embedding groove 1214, so that when the inner arc-isolating cover 12 is installed inside the outer arc-isolating cover 11, the positioning rib 1121 is embedded in the embedding groove 1214 to position the inner and outer arc-isolating covers during the assembling process, and to further support the wire mesh plate. The fitting groove 1214 is located rearward of the second guide groove 1212, i.e., between the second guide groove 1212 and the third guide groove 1213. Further, the strip groove 122 is located right outside the side plates 121 on both sides of the cavity 134, and the fitting groove 1214 is located at an upper portion of the strip groove 122 and near one end of the second guiding groove 1212.

As shown in fig. 2, 3 and 6, the top plate 112 of the outer arc-isolating cover 11 of the terminal cover 1 has at least one protrusion 117 on the surface facing the circuit breaker body 2, and the surface facing the terminal cover 1 of the circuit breaker body 2 is provided with a hole 23 fitted with the protrusion 117. When the terminal cover 1 is installed on the circuit breaker body 2, the protrusion 117 is matched with the hole 23, the connection of the terminal cover 1 and the circuit breaker body 2 is realized, and the structural strength of the terminal cover 1 in the circuit breaker outlet direction, namely the extension direction of the wiring bar 24 of the circuit breaker body 2 is improved. The shape of the protrusion 117 is not limited at all, and in this embodiment, a cylindrical shape or a circular ring shape is preferably selected, and a pair of cylindrical protrusions 117 and holes 23 are provided corresponding to each pole of the breaker body 2.

As shown in fig. 1 to 9, the assembly process of the circuit breaker of the present invention: firstly, respectively inserting a first wire mesh plate 131, a second wire mesh plate 133 and a support 132 into an deionization cavity 1251 of an inner arc-insulating hood 12, then inserting the three inner arc-insulating hoods 12 into three chambers 110 of the outer arc-insulating hood 11 from one end of the outer arc-insulating hood 11 towards a bottom plate 3 along the vertical direction, and completing the installation of the arc-insulating hood 1 by the embedding of a long strip groove 122 of a side plate 121 with a long strip protrusion 101 of the side plate 111 and an interval plate 114, the embedding of a positioning rib 1121 on a top plate 112 with an embedding groove 1214 of the side plate 121, and the embedding of a positioning hole groove 102 with a positioning protrusion 123; fixing the circuit breaker body 2 on the bottom plate 3, then embedding the mounting ribs 115 of the outer arc-isolating cover 11 in the mounting grooves 21 on the circuit breaker body 2, matching the protrusions 117 of the outer arc-isolating cover 11 with the holes 23 on the circuit breaker body 2, screwing the first screws 4 into the screw holes 22 of the circuit breaker 2 through the first mounting holes 116 of the top plate 112, and realizing the positioning of the terminal cover 1 and the circuit breaker body 2; finally, the second screw 5 is screwed into the nut 31 formed by the rivet on the bottom plate 3 after passing through the second mounting hole 1011 of the terminal cover 1, thereby completing the fixation.

To sum up, the utility model discloses a characteristics are inside terminal cover 1, have arranged first wire mesh board 131, support piece 132, second wire mesh board 133 in proper order in the advancing direction of electric arc, are equipped with cavity 134 between support piece 132 and second wire mesh board 133. Support member 132's setting can prevent from the impact of the wire mesh board in the terminal cover of the chamber gas outlet 25 spun electric arc that goes out and make wire mesh board produce excessive deformation, cavity 134 is provided with and does benefit to the further cooling of electric arc through the free back of first wire mesh board 131 disappearance, furthermore, support member 132's setting has also been avoided wire mesh board to warp and occupy cavity 134's space thereby influence the cooling effect, second wire mesh board 133 further disappears freely, prevent to disappear free gas to external environment's influence.

The application of the first wire mesh plate 131, the supporting member 132, the second wire mesh plate 133 and the cavity 134 is not limited to the terminal cover 1 with the above structure, the terminal cover 1 may have a structure without the inner arc-isolating cover 12 and only the outer arc-isolating cover 11 is provided, at this time, the first guide groove 1211, the second guide groove 1212 and the third guide groove 1213 are correspondingly formed on the side panel 111 and the phase-isolating plate 114 of the outer arc-isolating cover 11, the phase-isolating plate 114 and the phase-isolating plate 114, and the arrangement of the three guide grooves and the matching of the first wire mesh plate 131, the supporting member 132 and the second wire mesh plate 133 are the same as the above embodiment.

Claims

1. A terminal cover of a circuit breaker, the circuit breaker comprising a circuit breaker body (2) and a terminal cover (1) engaged with the circuit breaker body (2), the terminal cover (1) having an opening facing the circuit breaker body (2) and engaged with the circuit breaker body (2), an arc generated in the circuit breaker body (2) entering inside the terminal cover (1) through the opening of the terminal cover (1), characterized in that: a first wire mesh plate (131), a support member (132) and a second wire mesh plate (133) are sequentially arranged in the terminal cover (1) along the advancing direction of the electric arc, and a cavity (134) is arranged between the support member (132) and the second wire mesh plate (133).

2. The terminal cover of a circuit breaker according to claim 1, wherein said first wire mesh plate (131) and said second wire mesh plate (133) are each a metal braid, and said metal braid is a cross structure in which straight wires and wave-shaped wires are tightly woven in parallel with each other and spaced apart from each other or a cross structure in which wave-shaped wires and wave-shaped wires are tightly woven.

3. The terminal cover for circuit breaker according to claim 1, wherein said first wire mesh plate (131) and said second wire mesh plate (133) each have an air permeability of more than 30%.

4. The terminal cover of a circuit breaker according to claim 1, wherein said supporting member (132) is made of a non-deformable metal material or an insulating material, and has an air permeability of more than 50%.

5. A terminal cover of a circuit breaker according to claim 1, characterized in that said terminal cover (1) comprises an outer arc shield (11), the outer arc-isolating hood (11) comprises two side panels (111) which are arranged in parallel face to face, a top plate (112) which is positioned at the upper parts of the two side panels (111) and is used for connecting the two side panels (111), a rear plate (113) which is connected with the two side panels (111) and is far away from the end part of the circuit breaker body (2), and phase-isolating plates (114) which are arranged between the two side panels (111) at intervals, the spacing plate (114) is parallel to the two side panels (111) and the height of the spacing plate (114) is adapted to the two side panels (111), the phase partition plate (114) divides the inner cavity of the outer arc-isolating cover (11) into a plurality of cavities (110) with the same number of poles as the circuit breaker body (2) in the direction opposite to the two side panels (111).

6. The terminal cover of the circuit breaker according to claim 5, wherein the cavity wall of each cavity (110) is correspondingly provided with a first guide groove (1211) for inserting and matching the first wire mesh plate (131), a second guide groove (1212) adjacent to the first guide groove (1211) and located on one side of the first guide groove (1211) away from the opening of the terminal cover (1) for inserting and matching the support member (132), and a third guide groove (1213) for inserting and matching the second wire mesh plate (133), and the second guide groove (1212) and the third guide groove (1213) are respectively arranged on two sides of the cavity (134).

7. The terminal cover of the circuit breaker according to claim 5, wherein the terminal cover (1) further comprises inner arc-isolating covers (12), the number of the inner arc-isolating covers (12) is equal to the number of the chambers (110) and fixed in the chambers (110), the inner arc-isolating covers (12) comprise two side plates (121) arranged in parallel facing each other, an isolating insulating plate (125) arranged between the two side plates (121) and parallel to the top plate (112), the two side plates (121) are respectively matched with the chamber wall of the chamber (110), and the isolating insulating plate (125) divides the chamber (110) into a deionization chamber (1251) above the isolating insulating plate (125) and a wiring row mounting chamber (1252) below the isolating insulating plate (125).

8. The terminal cover of the circuit breaker according to claim 7, wherein the cavity wall of the deionization chamber (1251) is correspondingly provided with a first guide groove (1211) for inserting and matching the first wire mesh plate (131), a second guide groove (1212) adjacent to the first guide groove (1211) and located on the side of the first guide groove (1211) away from the opening of the terminal cover (1) for inserting and matching the support member (132), and a third guide groove (1213) for inserting and matching the second wire mesh plate (133), wherein the second guide groove (1212) and the third guide groove (1213) are respectively disposed on two sides of the cavity (134).

9. The terminal cover of the circuit breaker according to claim 7, characterized in that the top plate (112) of the outer arc-isolating cover (11) is provided with a positioning rib (1121) protruding toward the bottom plate (3), the corresponding two side plates (121) of the inner arc-isolating cover (12) are provided with an embedding groove (1214), when the inner arc-isolating cover (12) is installed inside the outer arc-isolating cover (11), the positioning rib (1121) is embedded with the embedding groove (1214), and the embedding groove (1214) is located between the second guide groove (1212) and the third guide groove (1213).

10. The terminal cover of circuit breaker according to claim 9, wherein at least one elongated protrusion (101) extending in the vertical direction of the outer arc shield (11) is protruded on the opposite surfaces of the side panel (111) and the spacing plate (114) or on the opposite surfaces of the spacing plates (114), strip grooves (122) are respectively concavely arranged on the two side plates (121) of the inner arc-insulating cover (12) corresponding to the strip bulges (101), the inner arc-insulating shield (12) is inserted into the chamber (110) in the vertical direction through the matching of the strip-shaped protrusion (101) and the strip-shaped groove (122), the positions of the strip grooves (122) on the side plates (121) on the two sides correspond to the positions of the cavities (134), and the fitting groove (1214) is positioned at the upper part of the strip groove (122) and close to one end of the second guide groove (1212).