CN117936334A - Free terminal cover disappears - Google Patents

Abstract

The invention discloses a free terminal eliminating cover, which belongs to the technical field of piezoelectric devices and comprises a first shell, an arc isolating grid sheet and a first screen, wherein the first shell is provided with at least one first cavity and air outlet holes which are communicated with the first cavity in a one-to-one correspondence manner, the first shell can be arranged on a shell of a circuit breaker, the first cavity can be communicated with air outlet holes on the shell in a one-to-one correspondence manner, and the air outlet holes are arranged opposite to each other along a first direction; a plurality of arc-isolating grid sheets are arranged in the first cavity at intervals along the first direction, namely the arc-isolating grid sheets are positioned between the corresponding air outlet holes and the air exhaust holes, and the arc-isolating grid sheets are provided with a plurality of first vent holes; a first screen plate is arranged between two adjacent arc-isolating grid plates. The free terminal cover provided by the invention can effectively prevent the splashing of metal particles while shortening the flashover distance.

Description

Free terminal cover disappears

Technical Field

The invention relates to the technical field of piezoelectric devices, in particular to a free terminal cover.

Background

The plastic shell circuit breaker is used as important electrical equipment for protecting a circuit system, and when faults such as short circuit, overload, undervoltage and the like occur in a circuit, the circuit breaker can actively cut off current, so that the safety of a power distribution system, the electrical equipment and staff is protected. However, when the breaker cuts off fault current, high-temperature electric arcs can be generated between the moving contact and the fixed contact, the electric arcs can be outwards sprayed out from the air outlet of the arc extinguishing chamber under the action of air flow, if sprayed electric arcs or high-temperature metal particles splash to surrounding electrified equipment, the burning loss of the surface of the equipment is easily caused, the insulation grade of the equipment is reduced, secondary short circuit and interphase breakdown of the breaker are seriously caused, the breaking failure of the breaker is caused, and the equipment is burnt. Therefore, the flashover distance in the breaking parameters of high voltage and high current is often an important index for measuring the breaking performance of the circuit breaker.

Currently, as shown in fig. 1, in order to reduce the arcing distance, a terminal cover 10 is generally mounted on a housing 100 of a circuit breaker, and gas discharged from an arc extinguishing chamber outlet flows through an exhaust hole of the circuit breaker and an arc isolating grid 11 in the terminal cover 10 in sequence. Although the arc-isolating grid 11 can shorten the arc-isolating distance to a certain extent to protect surrounding electrified equipment, metal particles can still splash on the wiring terminal 130 of the circuit breaker and the wiring copper bar 140 connected with the wiring terminal 130, so that surface burn and particle pollution are caused, the interphase insulation strength of the circuit breaker is reduced, and the risk of interphase short circuit of the circuit breaker is increased.

Disclosure of Invention

The invention aims to provide a free terminal cover which shortens the flashover distance and simultaneously effectively prevents the occurrence of splashing of metal particles.

To achieve the purpose, the invention adopts the following technical scheme:

provided is a terminal cover that eliminates play, including:

The circuit breaker comprises a first shell, a second shell and a third shell, wherein the first shell is provided with at least one first cavity and air outlet holes communicated with the first cavity in a one-to-one correspondence manner, the first shell can be arranged on a shell of the circuit breaker, the first cavity can be communicated with air outlet holes on the shell in a one-to-one correspondence manner, and the air outlet holes are oppositely arranged along a first direction;

The arc isolation grid plates are arranged in the first cavity at intervals along the first direction, and are provided with a plurality of first vent holes;

the first screen plate is arranged between two adjacent arc-isolating grid plates.

Optionally, the first shell comprises a shell body, the shell body comprises a top plate, an end plate arranged on a first side of the top plate and at least two side plates connected with the top plate and arranged at intervals along a second direction, and the end plate is provided with the air outlet hole;

the baffle, two adjacent can dismantle the grafting has one between the curb plate the roof the end plate the baffle and with two that the baffle corresponds be formed with between the curb plate first cavity, just first cavity in the second side of roof and corresponding exhaust hole intercommunication setting.

Optionally, the cross section of the first screen plate is wavy.

Optionally, at least one group of columns is arranged in the first cavity, each column group comprises at least three fixed columns, the first mesh plates are arranged in one-to-one correspondence with the column groups, and the first mesh plates are arranged between the corresponding fixed columns in a staggered penetrating manner.

Optionally, a second screen plate is arranged between the air outlet hole and the adjacent arc-isolating grid sheet.

Optionally, the shell is provided with at least one wiring groove and through holes communicated with the wiring grooves in a one-to-one correspondence manner, and wiring terminals are arranged in the wiring grooves;

The elimination terminal cover further includes:

The second shell can be arranged between the first shell and the shell, the second shell is correspondingly arranged with the wiring groove along a third direction, the second shell is provided with second cavities which are communicated with the first cavities in one-to-one correspondence, and operation holes which are communicated with the second cavities in one-to-one correspondence, and the first cavities can be communicated with the exhaust holes through the corresponding second cavities;

the hollow column is arranged in the second cavity, the first end of the hollow column is communicated with the operation hole, and the second end of the hollow column can be communicated with the through hole.

Optionally, an arc barrier is arranged in the second cavity, the arc barrier is arranged on one side of the hollow column, which is opposite to the first cavity, along the first direction, and a plurality of second vent holes are formed in the arc barrier.

Optionally, a third screen plate is arranged in the second cavity, and the third screen plate is arranged between the arc-isolating plate and the hollow column.

Optionally, the cross section of the third screen plate is U-shaped.

Optionally, the second housing is provided with two guide plates disposed opposite to each other along the second direction in the second cavity, and the hollow column is disposed between the two guide plates.

The beneficial effects are that:

According to the anti-free terminal cover provided by the invention, gas sprayed outwards from the gas outlet of the arc extinguishing chamber of the circuit breaker flows into the first cavity through the gas outlet hole of the shell and is discharged through the gas outlet hole, when the gas flows through the first cavity, the arc separation grid sheet and the first screen plate can both slow down the flow rate of the gas, so that the arcing distance is shortened, and the first screen plate can filter metal particles in the gas, so that the metal particles are effectively prevented from splashing out of the gas outlet hole. In addition, be equipped with first otter board between two adjacent arc bars that separate, the gas just before filtering through first otter board, all can be through separating the arc bars buffering earlier, effectively improve the filter effect of first otter board to the metal particles.

Drawings

Fig. 1 is a partial cross-sectional view of a prior art terminal cover mounted to a circuit breaker;

FIG. 2 is a partial cross-sectional view of the terminal cover of the present invention;

FIG. 3 is a schematic view of the structure in the first housing provided by the present invention;

fig. 4 is a schematic diagram of a structure in which a free terminal cover is plugged into a circuit breaker;

FIG. 5 is an exploded view of a portion of the structure of the terminal cover provided by the present invention;

FIG. 6 is a partial cross-sectional view of a first housing provided by the present invention;

Fig. 7 is a partial cross-sectional view of the present invention showing the mounting of the terminal cover to the circuit breaker;

fig. 8 is a partial cross-sectional view of the second housing provided by the present invention mounted on a circuit breaker;

FIG. 9 is an enlarged schematic view of the structure at E in FIG. 8 provided by the present invention;

FIG. 10 is an enlarged schematic view of the structure provided by the present invention at F in FIG. 8;

FIG. 11 is an exploded view of another part of the structure of the terminal cover of the present invention;

FIG. 12 is an enlarged schematic view of the structure at G in FIG. 11 provided by the present invention;

FIG. 13 is a schematic view of a partial structure of a second housing provided by the present invention;

fig. 14 is another partial cross-sectional view of the terminal cover of the present invention mounted to a circuit breaker;

fig. 15 is a further partial cross-sectional view of the present invention providing a terminal cover mounted to a circuit breaker.

In the figure:

10. a terminal cover; 11. arc-isolating grid plates;

100. A housing; 101. an exhaust hole; 102. wiring grooves; 103. a through hole; 104. sinking grooves; 105. a fourth slot; 110. a base; 120. a middle cover; 130. a connection terminal; 140. wiring copper bars;

200. A first housing; 201. a first cavity; 202. an air outlet hole; 210. a housing body; 211. a top plate; 2111. fixing the column; 212. an end plate; 213. a side plate; 2131. a first slot; 2132. a second slot; 2133. a convex strip; 21331. a boss; 220. a baffle;

300. arc-isolating grid plates; 301. a first vent hole;

400. a first screen;

500. a second screen;

600. A second housing; 601. a second cavity; 602. an operation hole; 603. an annular groove; 604. a clamping groove; 605. a third slot; 610. a deflector;

700. A hollow column;

800. Arc-shield plate; 801. a second vent hole;

900. And a third screen.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Referring to fig. 2 to 7, the present embodiment provides a free terminal cover applied to a circuit breaker.

Specifically, as shown in fig. 7, the circuit breaker includes a housing 100, at least one arc extinguishing chamber (not shown) disposed in the housing 100, and connection terminals 130 corresponding to the arc extinguishing chambers one by one, wherein the housing 100 is provided with exhaust holes 101 corresponding to the arc extinguishing chambers one by one, connection slots 102 corresponding to the connection terminals 130 one by one, and through holes 103 corresponding to the connection slots 102 one by one, and the connection slots 102 are provided with corresponding connection terminals 130.

Specifically, as shown in fig. 2 to 6, the terminal cover includes a first housing 200, an arc-isolating grid 300, and a first mesh plate 400. The first housing 200 is provided with at least one first cavity 201 and air outlet holes 202 which are communicated with the first cavity 201 in a one-to-one correspondence manner, the first housing 200 can be arranged on the shell 100 of the circuit breaker, the first cavity 201 can be communicated with the air outlet holes 101 on the shell 100 in a one-to-one correspondence manner, and the air outlet holes 202 and the air outlet holes 101 are arranged opposite to each other along a first direction; a plurality of arc-isolating grid plates 300 are arranged in the first cavity 201 at intervals along the first direction, namely, the arc-isolating grid plates 300 are positioned between the corresponding air outlet holes 202 and the air outlet holes 101, and the arc-isolating grid plates 300 are provided with a plurality of first vent holes 301; a first mesh plate 400 is provided between two adjacent arc-isolating sheets 300. Illustratively, the first cavity 201 is provided with three spaced apart cavities along the second direction. The direction a in the figure is a first direction, the first direction may be a length direction of the circuit breaker, the direction b is a second direction, and the second direction may be a width direction of the circuit breaker.

In this embodiment, the gas sprayed outwards from the gas outlet of the arc extinguishing chamber of the circuit breaker flows into the first cavity 201 through the gas outlet hole 101 of the housing 100 and is discharged through the gas outlet hole 202, when the gas flows through the first cavity 201, the arc isolating grid plate 300 and the first screen plate 400 can both slow down the flow rate of the gas, so as to shorten the arcing distance, and the first screen plate 400 can filter metal particles in the gas, so that the metal particles are effectively prevented from splashing out of the gas outlet hole 202, and the dissociation elimination function of the dissociation elimination terminal cover is realized. In addition, a first screen plate 400 is arranged between two adjacent arc-isolating grid plates 300, namely, before the gas is filtered by the first screen plate 400, the gas is buffered by the arc-isolating grid plates 300, so that the filtering effect of the first screen plate 400 on metal particles is effectively improved, and the dissociation capability of the dissociation terminal cover is further improved.

Illustratively, when more than three arc-isolating grating plates 300 are disposed in the first cavity 201, cavities are formed between two adjacent arc-isolating grating plates 300, and first mesh plates 400 are disposed in the cavities formed by two adjacent arc-isolating grating plates 300, i.e. the cavities are filtered in a multi-stage cavity manner, so that the arcing distance is shortened and the splashing of metal particles is effectively prevented.

Illustratively, the first mesh plate 400 may be composed of wires.

Illustratively, the material of the first housing 200 may be an insulating material.

Illustratively, the arc-isolating grid 300 may be made of metal.

Illustratively, one first mesh plate 400 may be disposed between two adjacent arc-isolating sheets 300, or a plurality of first mesh plates 400 may be disposed, which is not limited by the present application. Preferably, a first mesh plate 400 is disposed between two adjacent arc-isolating sheets 300.

Illustratively, the number of the arc-isolating bars 300 is determined according to the breaking parameters of the circuit breaker, and for the breaking of the circuit breaker with high voltage and high current, in order to realize zero arcing, the number of the arc-isolating bars 300 can be properly increased, and the number can be reduced.

Illustratively, each first cavity 201 corresponds to a plurality of gas outlet holes 202 spaced along the third direction, respectively, to further slow the flow rate of the gas. The direction c in the figure is a third direction, which may be the height direction of the circuit breaker.

In one possible embodiment, the diameters of the first ventilation holes 301 of the plurality of arc-separation grids 300 sequentially increase along the flow direction of the gas, that is, the diameters of the first ventilation holes 301 of the arc-separation grids 300 closer to the gas outlet holes 202 are larger, so that a group of gas flow buffering channels is formed to buffer layer by layer.

In the present embodiment, referring to fig. 3, 5 and 6, the first housing 200 includes a housing body 210 and a baffle 220, the housing body 210 includes a top plate 211, an end plate 212 disposed on a first side of the top plate 211, and at least two side plates 213 connected to the top plate 211 and disposed at intervals along a second direction, and the end plate 212 is provided with air outlet holes 202. Wherein, a baffle 220 is detachably inserted between two adjacent side plates 213, a first cavity 201 is formed between the top plate 211, the end plate 212, the baffle 220 and two side plates 213 corresponding to the baffle 220, and the first cavity 201 is disposed on a second side of the top plate 211 and communicated with the corresponding exhaust hole 101. When in assembly, the arc-isolating grid 300 and the first screen 400 can be assembled in the first cavity 201, and then the arc-isolating grid 300 and the first screen 400 are limited by the baffle 220, so that the assembly is convenient and reliable.

Specifically, the side plate 213 is provided with a first slot 2131 for inserting the arc-isolating grid 300 in a one-to-one correspondence manner. The inner sides of the side plates 213 at two sides are provided with first slots 2131, and two sides of the rest of side plates 213 are provided with first slots 2131. In this embodiment, the arc-isolating grating 300 and the first slot 2131 may be in a clearance fit, so as to facilitate the plugging of the arc-isolating grating 300. Further, the side plate 213 is further provided with a second slot 2132 for inserting the baffle 220. The inner sides of the side plates 213 at two sides are provided with second slots 2132, and two sides of the rest of side plates 213 are provided with second slots 2132. In this embodiment, when the first housing 200 is mounted on the casing 100, the casing 100 may form a limit for the baffle 220 to prevent the baffle 220 from being separated from the third slot 605. In addition, the connection terminal 130 and the connection copper bar 140 connected to the connection terminal 130 may be separated from the first cavity 201 by the baffle 220, further preventing metal particles from splashing on the connection terminal 130 and the connection copper bar 140.

In one possible embodiment, the side plate 213 extends to the wiring groove 102 along the third direction to separate the wiring copper bars 140 electrically connected to the wiring terminal 130, effectively improving the inter-phase insulation strength. Illustratively, the side plates 213 may extend to coincide with the bottom of the housing 100 of the circuit breaker.

In one possible embodiment, the first mesh plate 400 has a wavy cross section. Illustratively, the first mesh plate 400 may be formed by bending and folding. In this embodiment, the cross section of the first screen 400 is wavy, so that the contact area with the air flow can be increased, the splashing distance of the high-temperature electric arc can be shortened, and a good filtering effect can be achieved. In addition, the cross section of the first screen 400 is wavy, the first screen 400 can be of a thinner size, so that the situation that exhaust is blocked is prevented, cold and hot air exchange in the arc extinguishing chamber is good, timely cooling is realized, the breaking process of the circuit breaker is facilitated, and the first shell 200 is effectively prevented from being broken due to larger air pressure in the first cavity 201.

Specifically, at least one column group is disposed in the first cavity 201, the column group includes at least three fixing columns 2111, the first mesh plate 400 is disposed in one-to-one correspondence with the column groups, and the first mesh plate 400 is alternately disposed between the corresponding fixing columns 2111, so as to fix the first mesh plate 400 conveniently and reliably. Illustratively, the securing post 2111 is provided on the top plate 211. In this embodiment, the fixing columns 2111 are staggered on two sides of the first mesh plate 400, so as to effectively prevent the first mesh plate 400 from being severely deformed to affect the filtering effect.

In one possible embodiment, a second screen 500 is disposed between the air outlet holes 202 and the adjacent arc-isolating grid 300 to further filter the metal particles and prevent the metal particles from splashing out of the air outlet holes 202.

Illustratively, the second screen 500 may be shaped as a flat plate to more effectively filter fine metal particles. Wherein the thickness of the second net plate 500 may be greater than that of the first net plate 400.

Illustratively, the second screen 500 may be constructed of wires.

In the present embodiment, referring to fig. 7 to 15, the terminal cover further includes a second housing 600 and a hollow post 700. The second casing 600 can be disposed between the first casing 200 and the housing 100, and the second casing 600 is disposed corresponding to the wiring slot 102 along the third direction, the second casing 600 is provided with second cavities 601 in one-to-one correspondence with the first cavities 201 and operation holes 602 in one-to-one correspondence with the second cavities 601, and the first cavities 201 can be disposed in communication with the exhaust holes 101 through the corresponding second cavities 601; the hollow column 700 is disposed in the second cavity 601, a first end of the hollow column 700 is disposed in communication with the operation hole 602, and a second end of the hollow column 700 can be disposed in communication with the through hole 103. Wherein the operation hole 602 is arranged coaxially with the through hole 103. In this embodiment, the hollow post 700 can disperse air flow and has a certain pressure maintaining function, and the central hole of the hollow post 700 can be used for assembling and disassembling the binding screw of the binding post 130. In addition, the second cavity 601 is completely isolated from the wiring groove 102 by the hollow column 700, so that the gas can be prevented from flowing into the wiring groove 102 through the through hole 103, and further, the metal particles can be prevented from splashing on the wiring terminal 130.

Specifically, the second housing 600 is provided with an annular groove 603, the annular groove 603 and the operation hole 602 are coaxially arranged, and the first end of the hollow column 700 is inserted into the annular groove 603 to realize positioning, and the connection is stable and reliable.

Specifically, one end of the through hole 103 in the second cavity 601 is provided with a sinking groove 104, and the second end of the hollow column 700 is inserted into the sinking groove 104, so that the connection is stable and reliable.

In one possible embodiment, as shown in fig. 3, 4 and 15, a protruding strip 2133 is disposed on a side of the side plate 213 facing away from the end plate 212 along the first direction, a clamping groove 604 through which the protruding strip 2133 can slide is disposed on the second housing 600, and the protruding strip 2133 is inserted into the clamping groove 604 to realize connection between the first housing 200 and the second housing 600. Wherein the protrusions 2133 comprise protrusions 21331 thereon, the cross-sectional shape of protrusions 21331 includes, but is not limited to, the shape shown in fig. 3.

In one possible embodiment, as shown in fig. 7, the case 100 includes a base 110 and a middle cover 120, and the second case 600 may be integrally formed with the middle cover 120.

In this embodiment, referring to fig. 8 to 13, an arc barrier 800 is disposed in the second cavity 601, and the arc barrier 800 is provided with a plurality of second vent holes 801 to further slow down the flow rate of the gas and shorten the arcing distance.

Specifically, the arc barrier 800 is disposed on a side of the hollow pillar 700 facing away from the first cavity 201 in the first direction, that is, when the second case 600 is mounted between the first case 200 and the outer case 100, the arc barrier 800 is located between the hollow pillar 700 and the exhaust hole 101 in the first direction.

The second housing 600 is provided with a third slot 605, and the arc-shaped plate 800 is inserted into the third slot 605 along a third direction, and when the second housing 600 is installed between the first housing 200 and the housing 100, the housing 100 forms a limit on the arc-shaped plate 800 along the third direction, so as to stably fix the arc-shaped plate 800 in the second cavity 601.

Illustratively, the arc barrier 800 is made of plastic.

Further, a third mesh plate 900 is disposed in the second cavity 601, and the third mesh plate 900 is disposed between the arc-shaped barrier 800 and the hollow pillar 700. In this embodiment, in the cavity between the arc-isolating grating 300 adjacent to the arc-isolating plate 800 and the arc-isolating plate 800, the arrangement of the third screen 900 is used to perform preliminary filtration on the metal particles in the gas, so that the arcing distance can be further shortened, and the splashing of the metal particles can be more effectively prevented.

Illustratively, the third mesh plate 900 may be composed of wires.

Illustratively, the cross section of the third screen 900 is U-shaped, which can increase the contact area with the air flow, shorten the splashing distance of the high-temperature electric arc, and achieve a good filtering effect. It is understood that the third net plate 900 is formed with a U-shaped groove, and the hollow post 700 may be located in the U-shaped groove, so that the structure of the terminal cover is compact. Illustratively, the third net plate 900 may be formed by bending and folding.

In one possible embodiment, as shown in fig. 13 and 15, the second housing 600 is provided with two guide plates 610 disposed opposite to each other in the second direction in the second cavity 601, and a hollow pillar 700 is disposed between the two guide plates 610. The two guide plates 610 are also located in a U-shaped groove formed by enclosing the third screen 900, and the two guide plates 610 are matched with the side wall of the second cavity 601, so that a limit along the second direction can be formed on the third screen 900; the arc-shaped plate 800 can be abutted against the third screen 900 to limit the third screen 900 along the first direction, so that the assembly is stable and reliable and convenient. In this embodiment, the baffle 610 can guide the gas flow direction to disperse the gas flow, so as to have a certain pressure maintaining effect, and can increase the contact area between the second housing 600 and the gas, and further reduce the temperature of the gas.

Illustratively, the base 110 is provided with fourth slots 105 corresponding to the flow guide plates 610 one by one, and the flow guide plates 610 may be inserted into the fourth slots 105.

In this embodiment, when gas is sprayed outwards from the gas outlet of the arc extinguishing chamber of the circuit breaker, the gas flows into the second cavity 601 through the gas outlet 101 of the housing 100, and after the flow rate of the gas is slowed down through the arc barrier 800, larger metal particles are filtered through the third screen 900; then, the gas flows through the first cavity 201, the arc-isolating grid 300 is matched with the first screen 400, and medium-sized metal particles in the gas are filtered out in a multi-stage cavity mode; finally, smaller metal particles in the gas are filtered out through the second screen plate 500, the flashover distance in the breaking process of the circuit breaker can be greatly shortened through three-section dissociation, high-temperature metal particles are prevented from splashing on the wiring terminal 130 and the wiring copper bar 140 connected with the wiring terminal 130, and safety of surrounding electrical equipment is protected.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. A deionization terminal cover, comprising:

The circuit breaker comprises a first shell (200), a second shell (200) and a first air outlet, wherein the first shell (200) is provided with at least one first cavity (201) and air outlet holes (202) communicated with the first cavity (201) in a one-to-one correspondence manner, the first shell (200) can be arranged on a shell (100) of the circuit breaker, the first cavity (201) can be communicated with an air outlet hole (101) on the shell (100) in a one-to-one correspondence manner, and the air outlet holes (202) and the air outlet hole (101) are oppositely arranged along a first direction;

The arc isolation grid plates (300) are arranged in the first cavity (201) at intervals along a first direction, and the arc isolation grid plates (300) are provided with a plurality of first vent holes (301);

and a first screen plate (400), wherein the first screen plate (400) is arranged between two adjacent arc-isolating grid sheets (300).

2. The deionization terminal cover according to claim 1, wherein said first housing (200) comprises a housing body (210), said housing body (210) comprises a top plate (211), an end plate (212) provided on a first side of said top plate (211), and at least two side plates (213) connected to said top plate (211) and provided at intervals along a second direction, said end plate (212) being provided with said air outlet holes (202);

Baffle (220), two adjacent curb plates (213) can dismantle the grafting have one baffle (220), roof (211), end plate (212), baffle (220) and with be formed with between two curb plates (213) that baffle (220) correspond first cavity (201), just first cavity (201) in the second side of roof (211) and corresponding exhaust hole (101) intercommunication setting.

3. The terminal cover according to claim 1, wherein the cross section of the first mesh plate (400) is wavy.

4. The terminal cover according to claim 1, wherein at least one column group is disposed in the first cavity (201), the column group includes at least three fixing columns (2111), the first mesh plates (400) are disposed in one-to-one correspondence with the column groups, and the first mesh plates (400) are alternately disposed between the corresponding fixing columns (2111).

5. The elimination terminal cover according to claim 1, wherein a second screen (500) is provided between the air outlet hole (202) and the adjacent arc-isolating grid sheet (300).

6. The free terminal cover according to claim 1, wherein the housing (100) is provided with at least one wiring groove (102) and through holes (103) communicated with the wiring grooves (102) in a one-to-one correspondence manner, and a wiring terminal (130) is arranged in the wiring groove (102);

The elimination terminal cover further includes:

The second shell (600), the second shell (600) can be arranged between the first shell (200) and the shell (100), the second shell (600) is correspondingly arranged with the wiring groove (102) along a third direction, the second shell (600) is provided with second cavities (601) which are correspondingly communicated with the first cavities (201) one by one and operation holes (602) which are correspondingly communicated with the second cavities (601) one by one, and the first cavities (201) can be correspondingly communicated with the exhaust holes (101) through the corresponding second cavities (601);

The hollow column (700) is arranged in the second cavity (601), a first end of the hollow column (700) is communicated with the operation hole (602), and a second end of the hollow column (700) can be communicated with the through hole (103).

7. The free terminal cover according to claim 6, wherein an arc barrier (800) is disposed in the second cavity (601), the arc barrier (800) is disposed on a side of the hollow pillar (700) facing away from the first cavity (201) along the first direction, and the arc barrier (800) is provided with a plurality of second vent holes (801).

8. The terminal cover according to claim 7, wherein a third mesh plate (900) is disposed in the second cavity (601), and the third mesh plate (900) is disposed between the arc-shielding plate (800) and the hollow pillar (700).

9. The terminal cover according to claim 8, wherein the third mesh plate (900) has a U-shaped cross section.

10. The terminal cover according to claim 6, wherein the second housing (600) is provided with two guide plates (610) disposed opposite to each other in the second direction in the second cavity (601), and the hollow pillar (700) is disposed between the two guide plates (610).