Deionization terminal cover

Abstract

The utility model discloses a deionization terminal cover, which belongs to the technical field of low-voltage electric appliances, and comprises a first shell, an arc-isolating grid plate and a first net plate, 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 a circuit breaker, and the arc-isolating grid plate is arranged on the first shell. The first cavities can communicate with the exhaust holes in the shell in a one-to-one correspondence mode, and the air outlet holes and the exhaust holes are oppositely formed in the first direction. A plurality of arc-isolating grid sheets are arranged in the first cavity at intervals in the first direction, namely, the arc-isolating grid sheets are located between the corresponding air outlet holes and the corresponding exhaust holes, and the arc-isolating grid sheets are provided with a plurality of first vent holes; and a first screen plate is arranged between every two adjacent arc-isolating grid sheets. According to the deionization terminal cover provided by the utility model, the flashover distance is shortened, and meanwhile, the condition of splashing of metal particles is effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an anti-loosening terminal cover. Background Art

[0002] Molded case circuit breakers are important electrical equipment for protecting circuit systems. When short circuits, overloads, undervoltage and other faults occur in the circuit, the circuit breakers will actively cut off the current, thereby protecting the power distribution system, electrical equipment and the safety of workers. However, when the circuit breaker cuts off the fault current, a high-temperature arc will be generated between the moving and static contacts, which will be ejected from the outlet of the arc extinguishing chamber under the action of the airflow. If the ejected arc or high-temperature metal particles splash onto the surrounding live equipment, it is easy to cause the surface of the equipment to burn, causing the insulation level of the equipment to drop. In severe cases, it will cause secondary short circuits and phase-to-phase breakdown of the circuit breaker, causing the circuit breaker to fail to break and the equipment to burn. Therefore, among the high-voltage and high-current breaking parameters, the arcing distance is often an important indicator for measuring the breaking performance of the circuit breaker.

[0003] Currently, if Figure 1 As shown, in order to reduce the arcing distance, a terminal cover 10 is usually installed on the housing 100 of the circuit breaker, and the gas ejected from the outlet of the arc extinguishing chamber will flow through the exhaust hole of the circuit breaker and the arc-isolating grid 11 in the terminal cover 10 in sequence. Although the arcing distance can be shortened to a certain extent by the arc-isolating grid 11 to protect the surrounding live equipment, metal particles can still splash onto the wiring terminals 130 of the circuit breaker and the wiring copper busbar 140 connected to the wiring terminals 130, causing surface burns and particle pollution, reducing the phase-to-phase insulation strength of the circuit breaker, and increasing the risk of phase-to-phase short circuit of the circuit breaker. Utility Model Content

[0004] The utility model aims to provide a terminal cover for eliminating free arcing, which can effectively prevent the occurrence of metal particles splashing while shortening the arcing distance.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Provided is a terminal cover for eliminating loose terminals, comprising:

[0007] A first shell, provided with at least one first cavity and an air outlet hole connected to the first cavity in a one-to-one correspondence, the first shell can be arranged on the housing of the circuit breaker, and the first cavity can be connected to the air outlet hole on the housing in a one-to-one correspondence, and the air outlet hole is arranged opposite to the air outlet hole along a first direction;

[0008] Arc isolation grids, wherein a plurality of said arc isolation grids are arranged in the first cavity along a first direction at intervals, and the arc isolation grids are provided with a plurality of first vent holes;

[0009] A first mesh plate is provided between two adjacent arc isolation grids.

[0010] Optionally, the first shell includes a shell body, the shell body includes a top plate, an end plate arranged on a first side of the top plate, and at least two side plates connected to the top plate and arranged at intervals along the second direction, and the end plate is provided with the air outlet;

[0011] A baffle is detachably inserted between two adjacent side plates, and the first cavity is formed between the top plate, the end plate, the baffle and the two side plates corresponding to the baffle, and the first cavity is connected to the corresponding exhaust hole on the second side of the top plate.

[0012] Optionally, the first mesh plate has a wavy cross-section.

[0013] Optionally, at least one column group is disposed in the first cavity, the column group includes at least three fixed columns, the first mesh plates are disposed in one-to-one correspondence with the column groups, and the first mesh plates are staggered and arranged between the corresponding fixed columns.

[0014] Optionally, a second mesh plate is provided between the air outlet and the adjacent arc isolation grid.

[0015] Optionally, the housing is provided with at least one wiring slot and a through hole connected to the wiring slot in a one-to-one correspondence, and a wiring terminal is provided in the wiring slot;

[0016] The anti-freezing terminal cover also includes:

[0017] A second shell, the second shell can be arranged between the first shell and the outer shell, and the second shell is arranged along the third direction corresponding to the wiring slot, the second shell is provided with a second cavity connected to the first cavity in a one-to-one correspondence and an operation hole connected to the second cavity in a one-to-one correspondence, and the first cavity can be connected to the exhaust hole through the corresponding second cavity;

[0018] A hollow column is arranged in the second cavity, a first end of the hollow column is connected to the operation hole, and a second end of the hollow column can be connected to the through hole.

[0019] Optionally, an arc isolation plate is provided in the second cavity, and the arc isolation plate is arranged along the first direction on a side of the hollow column facing away from the first cavity, and the arc isolation plate is provided with a plurality of second ventilation holes.

[0020] Optionally, a third mesh plate is provided in the second cavity, and the third mesh plate is arranged between the arc isolation plate and the hollow column.

[0021] Optionally, the cross-section of the third mesh plate is U-shaped.

[0022] Optionally, the second shell is provided with two guide plates arranged opposite to each other along the second direction in the second cavity, and the hollow column is arranged between the two guide plates.

[0023] Beneficial effects:

[0024] The utility model provides a terminal cover for eliminating the free flow of gases ejected from the gas outlet of the arc extinguishing chamber of the circuit breaker to flow into the first cavity through the exhaust hole of the shell and be discharged through the gas outlet. When the gas flows through the first cavity, the arc-isolating grid and the first mesh plate can both slow down the flow rate of the gas, thereby shortening the arcing distance, and the first mesh plate can filter the metal particles in the gas, effectively preventing the metal particles from splashing out of the gas outlet. In addition, the first mesh plate is provided between two adjacent arc-isolating grids, that is, the gas will be buffered by the arc-isolating grid before being filtered by the first mesh plate, effectively improving the filtering effect of the first mesh plate on the metal particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a partial cross-sectional view of a terminal cover provided by the prior art installed on a circuit breaker;

[0026] Figure 2 It is a partial cross-sectional view of the free terminal cover provided by the utility model;

[0027] Figure 3 It is a schematic diagram of the structure inside the first shell provided by the utility model;

[0028] Figure 4 It is a structural schematic diagram of the utility model in which the anti-freezing terminal cover is plugged into the circuit breaker;

[0029] Figure 5 This is a partial structural exploded diagram of the free terminal cover provided by the utility model;

[0030] Figure 6 It is a partial cross-sectional view of the first shell provided by the utility model;

[0031] Figure 7 It is a partial cross-sectional view of the anti-freezing terminal cover provided by the utility model installed on the circuit breaker;

[0032] Figure 8 It is a partial cross-sectional view of the second housing provided by the utility model installed on the circuit breaker;

[0033] Fig. 9 The utility model provides Figure 8 A schematic diagram of the structure enlarged at E in FIG.

[0034] Fig.10 The utility model provides Figure 8 A schematic diagram of the structure enlarged at F in FIG.

[0035] Fig.11 It is an exploded view of another part of the structure of the free terminal cover provided by the utility model;

[0036] Fig.12 The utility model provides Fig.11 A schematic diagram of the structure enlarged at G in FIG.

[0037] Fig.13 It is a partial structural schematic diagram of the second shell provided by the utility model;

[0038] Fig.14 This is another partial cross-sectional view of the anti-freezing terminal cover provided by the utility model installed on the circuit breaker;

[0039] Fig.15 This is another partial cross-sectional view of the anti-freezing terminal cover provided by the utility model installed on the circuit breaker.

[0040] In the figure:

[0041] 10. Terminal cover; 11. Arc isolation grid;

[0042] 100, housing; 101, exhaust hole; 102, wiring slot; 103, through hole; 104, sink; 105, fourth slot; 110, base; 120, middle cover; 130, wiring terminal; 140, wiring copper bar;

[0043] 200, first shell; 201, first cavity; 202, air outlet; 210, shell body; 211, top plate; 2111, fixing column; 212, end plate; 213, side plate; 2131, first slot; 2132, second slot; 2133, convex strip; 21331, protrusion; 220, baffle;

[0044] 300, arc isolation grid; 301, first vent hole;

[0045] 400, first screen plate;

[0046] 500, second screen plate;

[0047] 600, second housing; 601, second cavity; 602, operation hole; 603, annular groove; 604, card slot; 605, third slot; 610, guide plate;

[0048] 700, hollow column;

[0049] 800, arc isolation plate; 801, second vent hole;

[0050] 900, the third screen. DETAILED DESCRIPTION

[0051] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0052] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0054] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0055] Reference Figures 2 to 7 As shown, this embodiment provides an anti-freezing terminal cover, which is applied to a circuit breaker.

[0056] Specifically, Figure 7As shown, the circuit breaker includes a housing 100 and at least one arc extinguishing chamber (not shown) arranged in the housing 100 and a wiring terminal 130 corresponding to the arc extinguishing chamber. The housing 100 is provided with exhaust holes 101 corresponding to the arc extinguishing chamber, wiring slots 102 corresponding to the wiring terminals 130, and through holes 103 connected to the wiring slots 102 in a one-to-one manner. The wiring slots 102 are provided with corresponding wiring terminals 130.

[0057] Specifically, Figures 2 to 6 As shown, the anti-freezing 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 an air outlet 202 correspondingly connected to the first cavity 201. The first housing 200 can be arranged on the housing 100 of the circuit breaker, and the first cavity 201 can be connected to the exhaust hole 101 on the housing 100 in a one-to-one correspondence. The air outlet 202 and the exhaust hole 101 are arranged opposite to each other along the first direction; a plurality of arc-isolating grids 300 are arranged in the first cavity 201 at intervals along the first direction, that is, the arc-isolating grid 300 is located between the corresponding air outlet 202 and the exhaust hole 101, and the arc-isolating grid 300 is provided with a plurality of first vents 301; and a first mesh plate 400 is arranged between two adjacent arc-isolating grids 300. Exemplarily, three first cavities 201 are arranged at intervals along the second direction. The direction a in the figure is the first direction, which may be the length direction of the circuit breaker, and the direction b is the second direction, which may be the width direction of the circuit breaker.

[0058] In this embodiment, the gas ejected from the gas outlet of the arc extinguishing chamber of the circuit breaker flows into the first cavity 201 through the exhaust hole 101 of the housing 100 and is discharged through the gas outlet 202. When the gas flows through the first cavity 201, the arc grid 300 and the first mesh plate 400 can both slow down the flow rate of the gas, thereby shortening the arcing distance, and the first mesh plate 400 can filter the metal particles in the gas, effectively preventing the metal particles from splashing out of the gas outlet 202, thereby realizing the deionization function of the deionization terminal cover. In addition, the first mesh plate 400 is provided between two adjacent arc grids 300, that is, the gas will be buffered by the arc grid 300 before being filtered by the first mesh plate 400, effectively improving the filtering effect of the first mesh plate 400 on the metal particles, thereby further improving the deionization ability of the deionization terminal cover.

[0059] Exemplarily, when more than three arc-isolating grids 300 are provided in the first cavity 201, a cavity is formed between two adjacent arc-isolating grids 300, and a first mesh plate 400 is provided in the cavity formed by two adjacent arc-isolating grids 300, that is, filtering is performed in a multi-stage cavity manner, which can shorten the arcing distance and effectively prevent the occurrence of metal particles from splashing.

[0060] Illustratively, the first mesh plate 400 may be made of metal wires.

[0061] Exemplarily, the material of the first shell 200 may be an insulating material.

[0062] Exemplarily, the arc isolation grid 300 may be made of metal.

[0063] Exemplarily, one first mesh plate 400 may be provided between two adjacent arc isolation grids 300 , or multiple first mesh plates 400 may be provided, which is not limited in the present application. Preferably, one first mesh plate 400 is provided between two adjacent arc isolation grids 300 .

[0064] Exemplarily, the number of arc isolation grids 300 is determined according to the parameters of the circuit breaker disconnection. For high voltage and high current circuit breaker disconnection, in order to achieve zero arcing, the number of arc isolation grids 300 can be appropriately increased, otherwise reduced.

[0065] Exemplarily, each first cavity 201 corresponds to a plurality of gas outlet holes 202 spaced apart along the third direction to further slow down the flow rate of the gas. The c direction in the figure is the third direction, which may be the height direction of the circuit breaker.

[0066] In a feasible implementation, along the gas flow direction, the diameters of the first vents 301 of the plurality of arc isolation grids 300 increase sequentially, i.e., the closer the arc isolation grid 300 is to the gas outlet 202, the larger the diameter of the first vents 301 is, and a group of airflow buffer channels are formed to perform layer-by-layer buffering.

[0067] In this embodiment, refer to Figure 3 , Figure 5 and Figure 6 As shown, the first shell 200 includes a shell body 210 and a baffle 220. The shell 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 spaced apart along the second direction. The end plate 212 is provided with an air outlet 202. Among them, 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 the two side plates 213 corresponding to the baffle 220, and the first cavity 201 is connected to the corresponding exhaust hole 101 on the second side of the top plate 211. During assembly, the arc-isolating grid 300 and the first mesh plate 400 can be assembled in the first cavity 201 first, and then the arc-isolating grid 300 and the first mesh plate 400 are limited by the baffle 220, which is convenient and reliable.

[0068] Specifically, the side panels 213 are provided with first slots 2131 for arc isolation grids 300 to be plugged in one by one. The first slots 2131 are provided on the inner sides of the side panels 213 at both sides, and the first slots 2131 are provided on both sides of the remaining side panels 213. In this embodiment, the arc isolation grids 300 and the first slots 2131 can be clearance-matched to facilitate the plugging of the arc isolation grids 300. Further, the side panels 213 are also provided with second slots 2132 for the baffle 220 to be plugged in. The second slots 2132 are provided on the inner sides of the side panels 213 at both sides, and the second slots 2132 are provided on both sides of the remaining side panels 213. In this embodiment, when the first shell 200 is installed on the housing 100, the housing 100 can limit 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 busbar 140 connected to the connection terminal 130 may be separated from the first cavity 201 by the baffle 220 , so as to further prevent metal particles from splashing onto the connection terminal 130 and the connection copper busbar 140 .

[0069] In a feasible implementation, the side plate 213 extends along the third direction to the wiring slot 102 to separate the wiring copper bar 140 electrically connected to the wiring terminal 130, effectively improving the interphase insulation strength. Exemplarily, the side plate 213 can extend to overlap with the bottom of the housing 100 of the circuit breaker.

[0070] In a feasible implementation, the cross section of the first mesh plate 400 is wavy. Exemplarily, the first mesh plate 400 can be formed by bending and folding. In this embodiment, the cross section of the first mesh plate 400 is wavy, which can increase the contact area with the airflow, shorten the splash distance of the high-temperature arc, and achieve a good filtering effect. In addition, the cross section of the first mesh plate 400 is wavy, and the first mesh plate 400 can be selected to be thinner in size to prevent the exhaust from being blocked, so that the cold and hot air in the arc extinguishing chamber are well exchanged, and timely cooling is achieved, which is beneficial to the disconnection process of the circuit breaker, and effectively prevents the first cavity 201 from causing the first shell 200 to rupture due to a large air pressure.

[0071] Specifically, at least one column group is provided in the first cavity 201, and the column group includes at least three fixing columns 2111. The first mesh plate 400 is provided in one-to-one correspondence with the column group, and the first mesh plate 400 is staggered between the corresponding fixing columns 2111 to achieve convenient and reliable fixation of the first mesh plate 400. Exemplarily, the fixing columns 2111 are provided on the top plate 211. In this embodiment, the fixing columns 2111 are staggered on both sides of the first mesh plate 400, which effectively prevents the first mesh plate 400 from being severely deformed and affecting the filtering effect.

[0072] In a feasible implementation, a second mesh plate 500 is disposed between the air outlet 202 and the adjacent arc isolation grid 300 to further filter the metal particles and prevent the metal particles from splashing out of the air outlet 202 .

[0073] For example, the second mesh plate 500 may be in the shape of a flat plate to more effectively filter fine metal particles, wherein the thickness of the second mesh plate 500 may be greater than the thickness of the first mesh plate 400 .

[0074] Illustratively, the second mesh plate 500 may be made of metal wires.

[0075] In this embodiment, refer to Figures 7 to 15 As shown, the anti-free terminal cover also includes a second shell 600 and a hollow column 700. The second shell 600 can be arranged between the first shell 200 and the housing 100, and the second shell 600 is arranged corresponding to the wiring slot 102 along the third direction. The second shell 600 is provided with a second cavity 601 connected to the first cavity 201 in a one-to-one correspondence and an operation hole 602 connected to the second cavity 601 in a one-to-one correspondence. The first cavity 201 can be connected to the exhaust hole 101 through the corresponding second cavity 601; the hollow column 700 is arranged in the second cavity 601, the first end of the hollow column 700 is connected to the operation hole 602, and the second end of the hollow column 700 can be connected to the through hole 103. The operation hole 602 is arranged coaxially with the through hole 103. In this embodiment, the hollow column 700 can disperse the airflow and has a certain pressure-maintaining effect. The center hole of the hollow column 700 can be used to disassemble and assemble the wiring screws of the wiring terminal 130. In addition, the hollow column 700 completely isolates the second cavity 601 from the wiring slot 102 , thereby preventing gas from flowing into the wiring slot 102 through the through hole 103 , thereby preventing metal particles from splashing onto the wiring terminal 130 .

[0076] Specifically, an annular groove 603 is provided on the second shell 600 , and the annular groove 603 is coaxially arranged with the operating hole 602 . The first end of the hollow column 700 is inserted into the annular groove 603 to achieve positioning, and the connection is stable and reliable.

[0077] Specifically, a sink 104 is provided at one end of the through hole 103 in the second cavity 601 , and the second end of the hollow column 700 is inserted into the sink 104 , so that the connection is stable and reliable.

[0078] In a possible implementation, Figure 3 , Figure 4 and Fig.15As shown, a convex strip 2133 is provided on the side of the side plate 213 facing away from the end plate 212 along the first direction, and a slot 604 is provided on the second housing 600 for the convex strip 2133 to slide through, and the convex strip 2133 is inserted into the slot 604 to achieve the connection between the first housing 200 and the second housing 600. Among them, the convex portion 21331 on the convex strip 2133, the cross-sectional shape of the convex portion 21331 includes but is not limited to the following: Figure 3 Shape shown.

[0079] In a possible implementation, Figure 7 As shown, the housing 100 includes a base 110 and a middle cover 120 , and the second shell 600 can be integrally formed with the middle cover 120 .

[0080] In this embodiment, refer to Figures 8 to 13 As shown, an arc isolation plate 800 is disposed in the second cavity 601 , and the arc isolation plate 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.

[0081] Specifically, the arc isolation plate 800 is arranged on a side of the hollow column 700 facing away from the first cavity 201 along the first direction, that is, when the second shell 600 is installed between the first shell 200 and the outer shell 100, the arc isolation plate 800 is located between the hollow column 700 and the exhaust hole 101 along the first direction.

[0082] Exemplarily, the second shell 600 is provided with a third slot 605, and the arc isolation plate 800 is inserted into the third slot 605 along a third direction. When the second shell 600 is installed between the first shell 200 and the outer shell 100, the outer shell 100 forms a limit for the arc isolation plate 800 along the third direction to stably fix the arc isolation plate 800 in the second cavity 601.

[0083] Exemplarily, the arc isolation plate 800 is made of plastic.

[0084] Furthermore, a third mesh plate 900 is provided in the second cavity 601, and the third mesh plate 900 is provided between the arc isolation plate 800 and the hollow column 700. In this embodiment, in the cavity between the arc isolation grid 300 adjacent to the arc isolation plate 800 and the arc isolation plate 800, the third mesh plate 900 is provided to preliminarily filter the metal particles in the gas, thereby further shortening the arcing distance and more effectively preventing the occurrence of metal particles splashing.

[0085] Exemplarily, the third mesh plate 900 may be made of metal wires.

[0086] For example, the cross section of the third mesh plate 900 is U-shaped, which can increase the contact area with the airflow, shorten the splash distance of the high-temperature arc, and achieve a good filtering effect. It can be understood that the third mesh plate 900 is surrounded by a U-shaped groove, and the hollow column 700 can be located in the U-shaped groove to make the structure of the free terminal cover compact. For example, the third mesh plate 900 can be formed by bending and folding.

[0087] In a possible implementation, Fig.13 and Fig.15 As shown, the second shell 600 is provided with two guide plates 610 arranged opposite to each other along the second direction in the second cavity 601, and a hollow column 700 is arranged between the two guide plates 610. Among them, the two guide plates 610 are also located in the U-shaped groove formed by the third mesh plate 900. The two guide plates 610 cooperate with the side wall of the second cavity 601 to form a limit for the third mesh plate 900 along the second direction; and the arc isolation plate 800 can abut against the third mesh plate 900 to form a limit for the third mesh plate 900 along the first direction, which is stable and reliable, and convenient to assemble. In this embodiment, the setting of the guide plate 610 can guide the flow direction of the gas to disperse the gas flow, has a certain pressure-maintaining effect, and can increase the contact area between the second shell 600 and the gas, which can further cool the gas.

[0088] Exemplarily, the base 110 is provided with fourth slots 105 arranged in one-to-one correspondence with the guide plates 610 , and the guide plates 610 can be plugged into the fourth slots 105 .

[0089] In this embodiment, when the gas is ejected outward from the gas outlet of the arc extinguishing chamber of the circuit breaker, the gas first flows into the second cavity 601 through the exhaust hole 101 of the housing 100, and after the gas flow rate is slowed down by the arc isolation plate 800, the larger metal particles are filtered through the third mesh plate 900; then, the gas flows through the first cavity 201, and the arc isolation grid 300 and the first mesh plate 400 cooperate to filter out the medium-sized metal particles in the gas through a multi-stage cavity; finally, the smaller metal particles in the gas are filtered out through the second mesh plate 500. After three-stage ion elimination, the arcing distance during the circuit breaker breaking process can be greatly shortened, and the high-temperature metal particles are prevented from splashing onto the terminal 130 and the copper busbar 140 connected to the terminal 130, thereby protecting the safety of surrounding electrical equipment.

[0090] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A terminal cover for eliminating loose terminals, characterized in that: include: A first shell (200) is provided with at least one first cavity (201) and an air outlet hole (202) connected to the first cavity (201) in a one-to-one correspondence, the first shell (200) can be arranged on a housing (100) of a circuit breaker, and the first cavity (201) can be connected to the air outlet hole (101) on the housing (100) in a one-to-one correspondence, and the air outlet hole (202) and the air outlet hole (101) are arranged opposite to each other along a first direction; An arc isolation grid (300), wherein a plurality of the arc isolation grids (300) are arranged in the first cavity (201) at intervals along a first direction, and the arc isolation grid (300) is provided with a plurality of first vent holes (301); A first mesh plate (400) is provided between two adjacent arc isolation grid plates (300).

2. The anti-loosening terminal cover according to claim 1, characterized in that: The first shell (200) comprises a shell body (210), the shell body (210) comprises a top plate (211), an end plate (212) arranged on a first side of the top plate (211), and at least two side plates (213) connected to the top plate (211) and arranged at intervals along a second direction, the end plate (212) being provided with the air outlet (202); A baffle (220) is detachably inserted between two adjacent side plates (213), and the first cavity (201) is formed between the top plate (211), the end plate (212), the baffle (220), and the two side plates (213) corresponding to the baffle (220), and the first cavity (201) is connected to the corresponding exhaust hole (101) on the second side of the top plate (211).

3. The anti-loosening terminal cover according to claim 1, characterized in that: The cross section of the first mesh plate (400) is wavy.

4. The anti-loosening terminal cover according to claim 1, characterized in that: At least one column group is arranged in the first cavity (201), the column group includes at least three fixed columns (2111), the first mesh plates (400) are arranged in one-to-one correspondence with the column groups, and the first mesh plates (400) are staggered and inserted between the corresponding fixed columns (2111).

5. The anti-loosening terminal cover according to claim 1, characterized in that: A second mesh plate (500) is provided between the air outlet hole (202) and the adjacent arc isolation grid (300).

6. The anti-loosening terminal cover according to claim 1, characterized in that: The housing (100) is provided with at least one wiring slot (102) and a through hole (103) connected to the wiring slot (102) in a one-to-one correspondence, and a wiring terminal (130) is provided in the wiring slot (102); The anti-freezing terminal cover also includes: A second shell (600), the second shell (600) can be arranged between the first shell (200) and the housing (100), and the second shell (600) is arranged corresponding to the wiring slot (102) along the third direction, the second shell (600) is provided with a second cavity (601) connected in a one-to-one correspondence with the first cavity (201) and an operation hole (602) connected in a one-to-one correspondence with the second cavity (601), and the first cavity (201) can be connected to the exhaust hole (101) through the corresponding second cavity (601); The hollow column (700) is arranged in the second cavity (601), the first end of the hollow column (700) is connected to the operation hole (602), and the second end of the hollow column (700) can be connected to the through hole (103).

7. The anti-loosening terminal cover according to claim 6, characterized in that: An arc isolation plate (800) is provided in the second cavity (601); the arc isolation plate (800) is arranged along a first direction on a side of the hollow column (700) facing away from the first cavity (201); and the arc isolation plate (800) is provided with a plurality of second ventilation holes (801).

8. The anti-loosening terminal cover according to claim 7, characterized in that: A third mesh plate (900) is provided in the second cavity (601), and the third mesh plate (900) is arranged between the arc isolation plate (800) and the hollow column (700).

9. The anti-loosening terminal cover according to claim 8, characterized in that: The cross section of the third mesh plate (900) is U-shaped.

10. The anti-loosening terminal cover according to claim 6, characterized in that: The second shell (600) is provided with two guide plates (610) arranged opposite to each other along a second direction in the second cavity (601), and the hollow column (700) is arranged between the two guide plates (610).

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