Up-down type zero-flashover cover

Abstract

The utility model relates to an up-and-down type zero-flashover cover which is arranged outside a circuit breaker assembly, and the circuit breaker assembly comprises a housing, an arc extinguish chamber, a static contact, a moving contact and an external connection plate. The vertical zero-flashover cover comprises an upper cover, a support and an insulating plate, wherein the upper cover and the support are arranged on the outer wall of a shell up and down; a zero flashover cavity is defined by the upper cover, the outer wall of the shell and the top of the support. The zero flashover cavity is communicated with the arc extinguish chamber through a vent hole in the outer wall of the shell. A plurality of exhaust holes are further formed in the side wall of the upper cover; the support covers the external bar, a plurality of inverted-L-shaped limiting tables are oppositely arranged at the top of the support, and the insulating plate is mounted on the support in an inserted mode through the inverted-L-shaped limiting tables on the two sides and is electrically insulated and separated from the upper side and the lower side of the insulating plate. Compared with the prior art, the upper cover and the support are arranged outside the circuit breaker assembly up and down to form the up-and-down separation cavity, and the electric insulation separation of the upper cavity and the lower cavity is realized through the insulating plate arranged at the top of the support, so that the electric arc is more difficult to escape to the lower end, and the short circuit of the external bar is effectively avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers and relates to an up-down type zero-arc escape cover. Background Art

[0002] With the development of human society, energy and environment have become urgent problems to be solved for the survival and development of mankind today. Low-carbon economy has become an irresistible trend in the global economic development. Solar power generation has become the most promising new energy because of its cleanliness, wide installation area and the prospect of achieving grid parity. With the continuous expansion of the scale of the solar photovoltaic power generation industry, the demand for DC molded case circuit breakers in photovoltaic and wind power is increasing. The DC voltage on the system DC side is increasing, and the performance requirements for the molded case circuit breakers are getting higher and higher.

[0003] In a molded case circuit breaker, an arc extinguishing chamber is usually arranged inside to extinguish the arc generated by the moving and static contacts in the electrical equipment to ensure the safe operation of the electrical equipment. Especially, it is difficult for a DC molded case circuit breaker to break the DC short-circuit current. During the breaking operation of this circuit breaker under load or in case of a large fault current, the arc is introduced into the arc extinguishing chamber of the circuit breaker through an arc guiding piece and a magnetic blow effect to play an arc extinguishing role. The arc extinguishing pieces in the arc extinguishing chamber are used to cut the arc and absorb energy, and finally the arc is extinguished. Due to the large breaking current, a small amount of charged ion free gas or residual arc will spray out of the circuit breaker housing from the rear of the arc extinguishing chamber, and at the same time, it will carry hot metal particles and directly spray outwards. This will break through the baffle of the circuit breaker terminal, and flying out of the circuit breaker will cause a short circuit or burnout of the surrounding lines. Content of the Utility Model

[0004] The purpose of the utility model is to provide an up-down type zero-arc escape cover to solve the problem of arc escaping to the external connection board.

[0005] The purpose of the utility model can be realized by the following technical solutions:

[0006] An up-down type zero-arc escape cover is arranged outside the circuit breaker assembly. The circuit breaker assembly includes a housing, an arc extinguishing chamber, a static contact and a moving contact. The static contact is connected to an external connection row. The external connection row is located below the arc extinguishing chamber and extends out of the housing.

[0007] The up-down type zero-arc escape cover includes an upper cover and a support arranged on the outer wall of the housing in an up-down manner, and an insulating board;

[0008] The upper cover, the outer wall of the housing and the top of the support surround to form a zero-arc cavity. The zero-arc cavity is communicated with the arc extinguishing chamber through a vent hole on the outer wall of the housing; a plurality of exhaust holes are also arranged on the side wall of the upper cover;

[0009] The support is sleeved outside the external connection, and a plurality of inverted L-shaped limiting platforms are oppositely arranged at the top. The insulating plate is inserted and installed on the support through the inverted L-shaped limiting platforms on both sides, and the upper and lower sides of the insulating plate are electrically insulated and separated.

[0010] Further, an assembly groove extending through up and down is provided on the outer wall of the housing, and the insulating plate is adapted to the shape of the assembly groove and abuts against it.

[0011] Further, an extension plate is provided on the side of the top of the upper cover, and the extension plate covers the through hole at the top of the assembly groove.

[0012] Further, an installation through hole is provided on the extension plate, and a mounting threaded hole is correspondingly provided on the top of the housing. The extension plate and the top of the housing are installed and connected by a screw passing through the installation through hole and screwed into the mounting threaded hole.

[0013] Further, housing insertion holes extending through up and down are provided on both sides of the outer wall of the housing. The housing insertion holes include a cylindrical through hole and a straight connection hole which are arranged inside and outside and communicated with each other. The width of the straight connection hole is smaller than the diameter of the cylindrical through hole;

[0014] The upper cover and the support are correspondingly provided with insertion and mating bosses. The insertion and mating bosses include a connecting straight plate and a cylindrical limiting block which are connected in sequence. The connecting straight plate is adapted to the straight connection hole, and the cylindrical limiting block is inserted and limited in the cylindrical through hole.

[0015] Further, the circuit breaker assembly includes at least two groups of arc extinguishing chambers, static contacts and moving contacts arranged in parallel. At least one partition is correspondingly provided in the upper cover, and one or more partitions divide the zero-flying arc chamber into at least two chambers, and each chamber is communicated with the corresponding arc extinguishing chamber;

[0016] At least two insulating plates are provided and are respectively arranged in the corresponding chambers.

[0017] Further, insertion and mating bosses are provided on the side edges of the partition. The insertion and mating bosses include a connecting straight plate and a cylindrical limiting block which are connected in sequence. A housing insertion hole is provided on the corresponding outer wall of the housing. The housing insertion hole includes a cylindrical through hole and a straight connection hole which are arranged inside and outside and communicated with each other. The connecting straight plate is adapted to the straight connection hole, and the cylindrical limiting block is inserted and limited in the cylindrical through hole.

[0018] Further, the circuit breaker assembly includes an external connection arranged in parallel and connected to the corresponding static contact. At least one support partition is provided in the support, and one or more support partitions divide the space in the support into at least two support chambers, and the external connection is arranged in the corresponding support chamber.

[0019] Further, sunken grooves are provided at corresponding positions on the top of the support, the partition board, and the side wall of the upper cover, and the partition board and the side wall of the upper cover are embedded in the corresponding sunken grooves.

[0020] Further, an arc separating plate is also connected between the upper cover and the support. The arc separating plate is connected to the outer walls of the upper cover and the support and is located on both sides of the external exhaust row and the insulating plate.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] 1) In the utility model, an upper and lower type isolation cavity is formed by installing and connecting an upper cover and a support above and below outside the circuit breaker assembly. The electrical insulation separation of the upper and lower chambers is realized through the insulating plate provided on the top of the support, making it more difficult for the arc to escape to the lower end; the exhaust holes provided on the upper cover facilitate the discharge of gas; through the plurality of oppositely arranged inverted L-shaped limiting platforms on the top of the support, the insulating plate is inserted and installed, which is convenient for the loading and unloading of the insulating plate, and has the advantages of simple structure, easy assembly, and effective avoidance of short circuit of the external exhaust row.

[0023] 2) In the utility model, a housing insertion hole is provided outside the housing of the circuit breaker assembly, and an insertion and matching convex platform is provided on the corresponding installation surfaces of the upper cover and the support. The connection and installation of the circuit breaker assembly with the upper cover and the support are realized through the insertion and matching of the housing insertion hole and the insertion and matching convex platform; at the same time, through the connection and cooperation between the cylindrical hole at the inner side position of the housing insertion hole and the cylindrical structure at the outer side of the insertion and matching convex platform, the relative separation of the housing from the upper cover and the support in the direction deviating from the depth of the housing insertion hole is avoided, ensuring the connection effect.

[0024] 3) After the external exhaust row, zero-flying arc cover, support, and insulating plate of the utility model are installed on the circuit breaker body, they can be selectively assembled and updated as needed.

[0025] 4) The utility model does not need to modify the circuit breaker body, thereby reducing the ineffective space, saving economy, and being applicable to various scenarios. Description of the Drawings

[0026] Figure 1 It is the front view structural schematic diagram of an upper and lower type zero-flying arc cover in the embodiment;

[0027] Figure 2 It is the top view structural schematic diagram of an upper and lower type zero-flying arc cover in the embodiment (the circuit breaker assembly is not shown);

[0028] Figure 3 、 Figure 4 It is the three-dimensional structural schematic diagram of the upper cover;

[0029] Figure 5 It is the three-dimensional structural schematic diagram of the support;

[0030] Figure 6Schematic three-dimensional structure diagram of the insulating plate;

[0031] Figure 7 Top view structure diagram of the circuit breaker assembly;

[0032] Figure 8 Top view structure diagram of the circuit breaker assembly after being assembled with the support;

[0033] Figure 9 is Figure 1 Cross-sectional view taken along line A-A in

[0034] Figure 10 Explosion diagram of an up-and-down type zero-flying arc cover in the embodiment;

[0035] Figure 11 Longitudinal sectional view of the circuit breaker assembly;

[0036] Figure 12 Assembly diagram of the arc separation plate, upper cover and support;

[0037] Explanation of the markings in the figure:

[0038] 1 - Upper cover, 2 - Support, 3 - Insulating plate, 4 - Circuit breaker assembly, 5 - External discharge, 6 - Arc separation plate, 7 - Screw, 8 - Arc extinguishing chamber, 9 - Static contact, 10 - Moving contact, 11 - Bottom surface structure, 12 - Upper cover insertion hole, 13 - Installation through hole, 21 - Insertion mating boss, 22 - Inverted L-shaped limiting platform, 23 - Semi-circular boss, 24 - Sinking groove, 25 - Support insertion hole, 41 - Semi-circular hole, 42 - Housing insertion hole, 43 - Installation threaded hole. Specific implementation manners

[0039] The present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments are implemented on the premise of the above technical solutions of the present utility model, and detailed implementation manners and specific operation processes are given, but the protection scope of the present utility model is not limited to the following embodiments.

[0040] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0041] Some implementation manners of the present utility model will be described in detail below with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0042] Embodiment:

[0043] Such as Figure 1 , Figure 2 , Figure 8 , Figure 9 ,Figure 10 A top-bottom type zero-arcing cover shown in the figure is provided outside the circuit breaker assembly 4, such as Figure 11 shown. The circuit breaker assembly 4 includes a housing, an arc extinguishing chamber 8, a static contact 9 and a moving contact 10. The static contact 9 is connected to the external connection row 5. The external connection row 5 is located below the arc extinguishing chamber 8 and extends out of the housing. The top-bottom type zero-arcing cover includes an upper cover 1 and a support 2 which are arranged on the outer wall of the housing one above the other, and an insulating plate 3 as shown in Figure 6 the figure. The upper cover 1, the outer wall of the housing and the top of the support 2 enclose a zero-arcing cavity. The zero-arcing cavity is communicated with the arc extinguishing chamber 8 through a vent hole on the outer wall of the housing. A plurality of exhaust holes are also provided on the side wall of the upper cover 1. The support 2 covers the outside of the external connection row 5, and a plurality of inverted L-shaped limiting platforms 22 are oppositely arranged on the top. The insulating plate 3 is inserted and installed on the support 2 through the inverted L-shaped limiting platforms 22 on both sides, and electrically insulates and separates the upper and lower sides of the insulating plate 3.

[0044] In this embodiment, an upper and a lower separated cavity are formed by installing and connecting the upper cover and the support one above the other outside the circuit breaker assembly, and the upper and lower chambers are electrically insulated and separated by the insulating plate arranged on the top of the support, making it more difficult for the arc to escape to the lower end; the exhaust holes provided on the upper cover facilitate air exhaust; through the plurality of oppositely arranged inverted L-shaped limiting platforms on the top of the support, the insulating plate is inserted and installed, so as to facilitate the loading and unloading of the insulating plate, and has the advantages of simple structure, easy assembly and effective avoidance of short circuit of the external connection row. In this embodiment, as shown in Figure 10 the figure, an assembly groove extending through the upper and lower parts is provided on the outer wall of the housing. The insulating plate 3 is adapted to the shape of the assembly groove and abuts against it, so as to prevent the arc from passing through the gap between the insulating plate 3 and the assembly groove.

[0045] In this embodiment, as shown in Figure 3 and Figure 4 the figure, an extension plate is provided on the side of the top of the upper cover 1, and the extension plate covers the through hole at the top of the assembly groove. More specifically, an installation through hole 13 is provided on the extension plate, and a corresponding installation threaded hole 43 is provided at the top of the housing. The extension plate and the top of the housing are installed and connected by a screw 7 passing through the installation through hole 13 and screwed into the installation threaded hole 43.

[0046] In this embodiment, on both sides of the outer wall of the housing, there are housing insertion holes 42 extending through the upper and lower parts. The housing insertion holes 42 include a cylindrical through-hole 42 and a straight connection hole which are arranged inside and outside and are connected. The width of the straight connection hole is smaller than the diameter of the cylindrical through-hole 42. On the upper cover 1 and the support 2, there are corresponding insertion and mating bosses 21. The insertion and mating bosses 21 include a connection straight plate and a cylindrical limiting block connected in sequence. The connection straight plate is adapted to the straight connection hole, and the cylindrical limiting block is inserted and limited in the cylindrical through-hole 42. The connection and installation of the circuit breaker assembly with the upper cover and the support are realized through the insertion and mating of the housing insertion holes 42 and the insertion and mating bosses 21. At the same time, through the connection and cooperation between the cylindrical hole at the inner side position of the housing insertion hole 42 and the cylindrical structure at the outer side of the insertion and mating boss 21, the relative separation of the housing from the upper cover and the support in the direction deviating from the depth direction of the housing insertion hole 42 is avoided, ensuring the connection effect.

[0047] In this embodiment, the circuit breaker assembly 4 includes two sets of arc extinguishing chambers 8, static contacts 9 and moving contacts 10 arranged in parallel. Inside the upper cover 1, there is a corresponding partition board, which divides the zero-fly-arc chamber into two chambers, and each chamber is connected to the corresponding arc extinguishing chamber 8. There are two corresponding insulating boards 3, which are respectively arranged in the corresponding chambers. In other embodiments, according to the number of sets of arc extinguishing chambers 8, static contacts 9 and moving contacts 10 included in the circuit breaker assembly 4, partition boards and insulating boards 3 can be arranged at corresponding positions to specifically avoid the problem of electric arcs escaping to the external connection board 5.

[0048] Similar to the connection structure between the upper cover, the support and the outer wall of the housing, on the side edge of the partition board, there is an insertion and mating boss 21. The insertion and mating boss 21 includes a connection straight plate and a cylindrical limiting block connected in sequence. On the corresponding outer wall of the housing, there is a housing insertion hole 42. The housing insertion hole 42 includes a cylindrical through-hole 42 and a straight connection hole which are arranged inside and outside and are connected. The connection straight plate is adapted to the straight connection hole, and the cylindrical limiting block is inserted and limited in the cylindrical through-hole 42.

[0049] Corresponding to multiple sets of static contacts 9, the circuit breaker assembly 4 includes an external connection row 5 arranged in parallel and connected to the corresponding static contacts 9. Inside the support 2, there is a support partition board, which divides the space inside the support 2 into at least two support chambers, and the external connection row 5 is arranged in the corresponding support chamber.

[0050] In this embodiment, sinking grooves 24 are provided at corresponding positions on the top of the support 2, the partition board, and the side wall of the upper cover 1. The bottom surface structure 11 formed by the partition board and the side wall of the upper cover 1 is closely adapted to the shape of the sinking grooves 24 and is embedded in the corresponding sinking grooves 24. During the process of opening the circuit breaker, the static contact bridge, the arc ignition piece, and even the external connection row 5 in the arc extinguishing chamber 8 will be electrified. If there is no concave-convex matching structure of the zero-flying arc cover outside, the electric arc will escape along the outer wall to another phase, resulting in a short circuit inside. However, if there is a concave-convex matching structure of the bottom surface structure 11 and the sinking grooves 24, the creepage distance required for the electric arc increases, and coupled with the tight fit of this matching structure, the short-circuit phenomenon can be avoided.

[0051] In this embodiment, as Figure 12 shown, an arc isolation board 6 is further connected outside the upper cover 1 and the support 2. The arc isolation board 6 is connected to the outer walls of the upper cover 1 and the support 2 and is located on both sides of the external connection row 5 and the insulating board 3.

[0052] During assembly, after the circuit breaker assembly 4 is connected to the external connection row 5, the plug-in matching boss 21 of the support 2 is aligned with the housing plug-in hole 42 of the circuit breaker assembly 4 and inserted. The semi-circular boss 23 penetrates into the semi-circular hole 41 of the circuit breaker assembly 4. As Figure 5 、 Figure 7 、 Figure 10 shown, the insulating board 3 is inserted into the inverted L-shaped limiting platform 22 of the support 2. The plug-in matching boss 21 of the upper cover 1 is aligned with the housing plug-in hole 42 of the circuit breaker assembly 4 and inserted. The mounting through hole 13 is axially aligned with the mounting threaded hole 43 of the circuit breaker assembly 4 and fixed with a screw 7. The plug-in boss on the arc isolation board 6 is inserted into the support plug-in hole 25 of the support 2 and the upper cover plug-in hole 12 of the upper cover 1. The structure of the plug-in boss is the same as that of the plug-in matching boss 21, and the structures of the support plug-in hole 25 and the upper cover plug-in hole 12 are the same as that of the housing plug-in hole 42.

[0053] Working principle:

[0054] When the moving contact 10 and the static contact 9 in the circuit breaker assembly 4 are closed and then opened, a large amount of energy arc will be generated. Under the action of the arc extinguishing chamber 8, it is truncated into small arcs. The up-and-down layered structure makes the arcs escaping from the vent holes on the outer wall of the housing blocked by the insulating board 3 and difficult to reach the position of the external connection row 5 upward or downward: the semi-circular boss 23 of the support 2 provides support for the insulating board 3, the insulating board 3 blocks the falling arcs, and the bottom surface structure 11 of the upper cover 1 and the sinking grooves 24 of the support 2 form an effective protection to prevent short circuits inside the circuit breaker. The up-and-down split structure allows users to choose to install and disassemble this zero-flying arc cover structure by themselves to suit different occasions.

[0055] The above description of the embodiments is provided to enable those of ordinary skill in the art to understand and use the utility model. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the utility model is not limited to the above embodiments, and all improvements and modifications made by those skilled in the art without departing from the scope of the utility model according to the disclosure of the utility model should be within the protection scope of the utility model.

Claims

1. An upper and lower zero arcing cover, arranged outside a circuit breaker assembly (4), the circuit breaker assembly (4) comprising a housing, an arc extinguishing chamber (8), a stationary contact (9) and a moving contact (10), the stationary contact (9) being connected to an external connection row (5), the external connection row (5) being located below the arc extinguishing chamber (8) and extending out from the housing, characterized in that: The upper and lower zero arcing cover comprises an upper cover (1) and a support (2) which are arranged on the outer wall of the shell, and an insulating plate (3); The upper cover (1), the outer wall of the shell, and the top of the support (2) together form a zero-flashover cavity, and the zero-flashover cavity is connected to the arc extinguishing chamber (8) through a vent hole on the outer wall of the shell; a plurality of exhaust holes are also provided on the side wall of the upper cover (1); The support (2) is covered outside the external row (5), and a plurality of inverted L-shaped limit platforms (22) are arranged on the top thereof. The insulating plate (3) is installed on the support (2) by plugging the inverted L-shaped limit platforms (22) on both sides, and electrically insulates and separates the upper and lower sides of the insulating plate (3).

2. The vertical zero arcing cover according to claim 1, characterized in that: The outer wall of the shell is provided with an assembly groove extending vertically through the outer wall, and the insulating plate (3) is adapted to the shape of the assembly groove and abuts against it.

3. The vertical zero arcing cover according to claim 2 is characterized in that: The top side of the upper cover (1) is provided with an overhanging plate, and the overhanging plate covers the through hole at the top of the assembly groove.

4. The vertical zero arcing cover according to claim 3 is characterized in that: The extending plate is provided with a mounting through hole (13), and the top of the shell is correspondingly provided with a mounting threaded hole (43). The extending plate and the top of the shell are mounted and connected by screws (7) that pass through the mounting through hole (13) and are screwed into the mounting threaded hole (43).

5. The vertical zero arcing cover according to claim 2, characterized in that: Both sides of the outer wall of the shell are provided with shell plug holes (42) extending vertically therethrough, the shell plug holes (42) comprising cylindrical through holes and straight connecting holes arranged inside and outside and connected to each other, the width of the straight connecting holes being smaller than the diameter of the cylindrical through holes; The upper cover (1) and the support (2) are provided with corresponding plug-in mating bosses (21), the plug-in mating bosses (21) comprising a connecting straight plate and a cylindrical limiting block connected in sequence, the connecting straight plate being adapted to the straight connecting hole, and the cylindrical limiting block being plug-in limited in the cylindrical through hole.

6. The vertical zero arcing cover according to claim 2, characterized in that: The circuit breaker assembly (4) comprises at least two groups of arc extinguishing chambers (8), a static contact (9) and a moving contact (10) arranged in parallel, and at least one partition is correspondingly arranged in the upper cover (1), and one or more partitions divide the zero arcing chamber into at least two chambers, each chamber being connected to the corresponding arc extinguishing chamber (8); At least two insulating plates (3) are provided and are respectively arranged in corresponding chambers.

7. The vertical zero arcing cover according to claim 6, characterized in that: A plug-in mating boss (21) is provided on the side of the partition, and the plug-in mating boss (21) includes a connecting straight plate and a cylindrical limit block connected in sequence, and a shell plug-in hole (42) is provided on the corresponding shell outer wall, and the shell plug-in hole (42) includes a cylindrical through hole and a straight connecting hole arranged inside and outside and connected, the connecting straight plate is adapted to the straight connecting hole, and the cylindrical limit block is plug-in limited in the cylindrical through hole.

8. The vertical zero arcing cover according to claim 6, characterized in that: The circuit breaker assembly (4) comprises external connecting rows (5) arranged in parallel and connected to corresponding stationary contacts (9), at least one supporting partition is provided in the supporting seat (2), and one or more partitions divide the space in the supporting seat (2) into at least two supporting chambers, and the external connecting rows (5) are arranged in the corresponding supporting chambers.

9. The vertical zero arcing cover according to claim 6, characterized in that: A sinking groove (24) is provided at the top of the support (2) and at a position corresponding to the partition plate and the side wall of the upper cover (1); the partition plate and the side wall of the upper cover (1) are embedded in the corresponding sinking groove (24).

10. The vertical zero arcing cover according to claim 1, characterized in that: The upper cover (1) and the support (2) are also connected to arc isolation plates (6), which are connected to the outer walls of the upper cover (1) and the support (2) and are located on both sides of the external row (5) and the insulating plate (3).

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