阅读说明：本技术 一种端子罩安装结构 (Terminal cover mounting structure ) 是由 胡刚 朱世嘉 向孝平 袁天江 于 2019-11-04 设计创作，主要内容包括：一种端子罩安装结构,它包括断路器本体(1),端子罩壳体(2)和灭弧栅片(3),所述灭弧栅片(3)装在所述端子罩壳体(2)上,所述灭弧栅片(3)和所述端子罩壳体(2)装在一起安装在所述断路器本体(1)的端子接线端(101)用于对所述端子接线端(101)进行封盖并对各相进行隔离,其特征在于：所述灭弧栅片(3)包括灭弧部(302),所述灭弧部(302)为瓦片状,且以瓦片状安装在所述端子罩壳体(2)上。该端子罩安装结构通过灭弧栅片和消游离滤网来熄灭喷出的电弧,从而使插入式断路器在不改变安装体积的前提下,也能通过端子罩有效的熄灭电弧,从而保护周围设备性能不受影响。(The utility model provides a terminal cover mounting structure, it includes circuit breaker body (1), terminal cover casing (2) and arc extinguishing bars piece (3), arc extinguishing bars piece (3) are adorned on terminal cover casing (2), arc extinguishing bars piece (3) with install together terminal cover casing (2) the terminal wiring end (101) of circuit breaker body (1) are used for right terminal wiring end (101) carry out the closing cap and keep apart its characterized in that to each phase: arc extinguishing bars piece (3) are including arc extinguishing portion (302), arc extinguishing portion (302) are the tile shape, and install with the tile shape on terminal cover casing (2). This terminal cover mounting structure extinguishes spun electric arc through arc extinguishing bars piece and free filter screen that disappears to make plug-in circuit breaker under the prerequisite that does not change the installation volume, also can pass through the effectual electric arc that extinguishes of terminal cover, thereby the equipment performance is not influenced on every side in the protection.)

1. The utility model provides a terminal cover mounting structure, it includes circuit breaker body (1), terminal cover casing (2) and arc extinguishing bars piece (3), arc extinguishing bars piece (3) are adorned on terminal cover casing (2), arc extinguishing bars piece (3) with install together terminal cover casing (2) the terminal wiring end (101) of circuit breaker body (1) are used for right terminal wiring end (101) carry out the closing cap and keep apart its characterized in that to each phase: arc extinguishing bars piece (3) are including arc extinguishing portion (302), arc extinguishing portion (302) are the tile shape, and install with the tile shape on terminal cover casing (2).

2. A terminal cover mounting structure according to claim 1, wherein: and a deionization filter screen (4) is also arranged on one side of the terminal cover shell (2) after the electric arc passes through the arc extinguishing grid plate (3).

3. A terminal cover mounting structure according to claim 2, wherein: the deionization filter screen (4) is clamped in a groove (201) of the terminal cover shell (2) to correspond to the arc extinguishing part (302) and is pressed by the arc extinguishing part (302).

4. A terminal cover mounting structure according to claim 2, wherein: arc extinguishing bars piece (3) are the metal sheet, set up round hole one (302a) on arc extinguishing portion (302), round hole one (302a) is arranged in the line, interval staggered arrangement between every line, arc extinguishing portion (302) support the burr face of deionization filter screen (4) makes it fixed.

5. A terminal cover mounting structure according to claim 2, wherein: the deionization filter screen (4) is a metal grid plate, diamond-shaped square grooves are arranged on the metal grid plate, the diamond-shaped square grooves are arranged in lines, and the lines are arranged in a staggered mode.

6. A terminal cover mounting structure according to claim 1, wherein: the tile-shaped arc extinguishing part (302) is formed by connecting a single V-shaped or semi-circular arc or a plurality of V-shaped and semi-circular arc.

7. A terminal cover mounting structure according to claim 2, wherein: the deionization filter screen (4) is adhered to the terminal cover shell (2).

8. A terminal cover mounting structure according to claim 2, wherein: one end of the deionization filter screen (4) is clamped in the clamping groove (304) at one end of the arc extinguishing grid plate (3).

9. A terminal cover mounting structure according to claim 1, wherein: arc extinguishing bars piece (3) still include installation department (301), arc extinguishing bars piece (3) utilize installation department (301) to adorn on terminal cover casing (2).

Technical Field

The invention belongs to the technical field of low-voltage circuit breakers, and particularly relates to a terminal cover mounting structure which can effectively extinguish electric arcs.

Background

The low-voltage circuit breaker plays a role in breaking and closing a circuit in the power transmission and distribution line. With the improvement of the breaking capacity requirement of the circuit breaker and the popularization of a large amount of gas generating materials, the internal air pressure of the circuit breaker is increased sharply during breaking. Under huge pressure, internal free gas or metal particles diffuse outside the circuit breaker in the breaking process, so that other low-voltage components in the cabinet are burnt under the corrosion action of electric arcs, and even a short circuit risk is formed. The terminal cover is an important accessory for the external connection of the molded case circuit breaker, is generally made of insulating materials and is used for eliminating electric arcs and enhancing the insulation grade of the circuit breaker.

At present, the conventional plastic terminal cover cannot meet the arc extinguishing performance in breaking and cannot effectively reduce arcing. If the purpose of effectively reducing flashover is to be realized, the length of the terminal cover needs to be increased, so that the installation volume of the terminal cover is increased, and the space volume in the cabinet body cannot be effectively utilized.

At the same time, when the plug-in circuit breaker is used in a switchgear cabinet, the terminal covers must be matched at the same time, and the length of the terminal covers is limited by the length of the plug-in holders. The current terminal cover can not meet the requirement of a breaker with a plug-in device on the flashover distance during breaking, and can not meet the requirement of the space reserved during the design of a matching cabinet and a box body of a customer.

The device comprises a plurality of flat-plate-shaped free-run screens disclosed in Chinese patent CN109300746A, and a free-run screen disclosed in Chinese patent CN2165516Y, wherein 20 flat-plate-shaped free-run screens with the same distance are selected; the length of the terminal cover is forced to be lengthened to meet the installation requirement that the pieces of deionization net have certain intervals. And when used in a plug-in circuit breaker, the long terminal cover exceeds the plug-in length, although the arc overflow can be prevented, the long terminal cover cannot be correspondingly installed in a matching manner in terms of volume.

Disclosure of Invention

The invention aims to solve the technical defect that the length of a terminal cover cannot be increased to meet the arc extinguishing requirement in the prior art, and provides a terminal cover mounting structure which can extinguish the sprayed arc through an arc extinguishing grid sheet and an ionization eliminating filter screen, so that an inserted circuit breaker can effectively extinguish the arc through the terminal cover on the premise of not changing the mounting volume, and peripheral equipment is protected from being influenced.

Technical scheme

In order to achieve the above technical object, the present invention provides a terminal cover mounting structure, which includes a circuit breaker body, a terminal cover housing and an arc chute, wherein the arc chute is mounted on the terminal cover housing, and the arc chute and the terminal cover housing are mounted together on a terminal connection end of the circuit breaker body for capping the terminal connection end and isolating each phase, and the structure is characterized in that: the arc extinguishing bars piece includes the arc extinguishing portion, the arc extinguishing portion is the tile form, and installs with the tile form on the terminal cover casing. The tile-shaped electric arc filtering area is larger, and metal particles can be better adsorbed on the tile-shaped electric arc filtering area when passing through the gradient surface; therefore, the effective utilization area of the grid pieces is increased, a small number of grid pieces are used and are mounted on the short terminal cover, and the same effect as that of mounting a plurality of deionization nets on the long terminal cover is achieved.

Furthermore, a deionization filter screen is arranged on one side of the terminal cover shell behind the arc-extinguishing grid piece.

Furthermore, the deionization filter card is arranged in a groove of the terminal cover shell, corresponds to the arc extinguishing part and is pressed by the arc extinguishing part.

Further, the arc extinguishing bars are metal plates, the arc extinguishing portion is provided with first round holes, the first round holes are arranged in lines, the intervals between the lines are staggered, and the arc extinguishing portion supports the burr surface of the filter screen for deionization to enable the burr surface to be fixed.

Furthermore, the filtering net for eliminating dissociation is a metal grid plate, diamond-shaped square grooves are arranged on the metal grid plate, the diamond-shaped square grooves are arranged in rows, and the rows are staggered.

Furthermore, the tile shape of the arc extinguishing part is formed by connecting a single V shape, a semi-circular arc shape or a plurality of V shapes and semi-circular arc shapes.

Further, the deionization filter is adhered to the terminal cover housing.

Furthermore, one end of the deionization filter screen is clamped in the clamping groove at one end of the arc extinguishing grid plate.

Further, the arc extinguishing bars piece still includes the installation department, the arc extinguishing bars piece utilizes the installation department dress to be in on the terminal cover casing.

Advantageous effects

The invention provides a terminal cover mounting structure, which extinguishes sprayed electric arcs through arc extinguishing grid pieces and dissociation eliminating filter screens, so that an inserted circuit breaker can effectively extinguish the electric arcs through the terminal cover on the premise of not changing the mounting volume, and peripheral equipment is protected from being influenced.

Drawings

Fig. 1a is a schematic view of a structure of mounting a terminal cover in embodiment 1 of the present invention.

Fig. 1b is an exploded view of the terminal cover mounting structure in embodiment 1 of the present invention.

Fig. 2a is a first perspective view of a terminal cover in embodiment 1 of the present invention.

Fig. 2b is a second perspective view of the terminal cover in embodiment 1 of the present invention.

Fig. 2c is an enlarged view at a in fig. 2 b.

Fig. 3a is a perspective view of a circuit breaker body in embodiment 1 of the present invention.

Fig. 3B is an enlarged view at B in fig. 3 a.

FIG. 4 is a schematic view showing the positions of exhaust slots in the terminal cover in embodiment 1 of the present invention.

Fig. 5 is a perspective view of an arc chute in embodiment 1 of the present invention.

FIG. 6 is a perspective view of a deionizing filter in example 1 of the present invention.

Fig. 7 is a schematic diagram of the position of the arc chute pieces on the circuit breaker body in embodiment 1 of the invention.

Fig. 8 is a perspective view of an arc chute in embodiment 2 of the present invention.

Fig. 9 is a perspective view of an arc chute in embodiment 3 of the present invention.

Fig. 10 is a perspective view of an arc chute in embodiment 4 of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1

As shown in fig. 1a and 1b, 4 and 7, a terminal cover mounting structure includes a circuit breaker body 1, a terminal cover case 2 and arc chute pieces 3, the arc chute pieces 3 are mounted on the terminal cover case 2, the arc chute pieces 3 and the terminal cover case 2 are mounted together on a terminal 101 of the circuit breaker body 1 for covering the terminal 101 and isolating the phases,

the arc extinguishing grid 3 and the terminal cover shell 2 are assembled together by an elastic positioning structure, and the terminal cover shell 2 is assembled on a terminal 101 of the circuit breaker body 1 by a guide limiting structure;

as shown in fig. 2b,3a and 3b, the guiding and limiting structure includes a connecting protruding rib 202 disposed on the inner side end of the lower plate wall of each partition board of the terminal cover housing 2, in this embodiment, the connecting protruding rib 202 is T-shaped; as shown in fig. 3a, the terminal 101 on the circuit breaker body 1 is provided with a plurality of wiring installation grooves 101a in parallel, the groove walls of the plurality of wiring installation grooves 101a are provided with connection grooves 101a01 installed in cooperation with the connection ribs 202, the connection ribs 202 are installed in the connection grooves 101a01 to realize stable installation of the terminal cover housing 2 on the terminal 101 of the circuit breaker body 1, so that phase-to-phase isolation and edgemost phase-to-circuit breaker body isolation are realized, the isolation effect of free gas between phases in a breaking process can be improved, and the free gas cannot overflow to both sides of the outside.

As shown in fig. 2a, 2b and 2c, the elastic positioning structure includes elastic legs 203 on the upper plate walls of the partition boards of each phase of the terminal cover housing 2, mounting holes 303 corresponding to the elastic legs 203 are formed on the arc-extinguishing grid pieces 3, and the elastic legs 203 are inserted into the mounting holes 303 and can abut against the hole walls of the mounting holes 303 to realize stable mounting of the arc-extinguishing grid pieces 3 and the terminal cover housing 2; in the processes of breaking, transporting, installing and the like of the circuit breaker, the arc extinguishing grid pieces 3 can be well prevented from falling off by the fixed installation mode. Because other fasteners are not needed for fixing the arc extinguishing grid piece 3 and the terminal cover shell 2, and the arc extinguishing grid piece can be attached to the surface of the terminal cover shell 2, the structure is simple and light, and the volume is small.

And a deionization filter screen 4 is also arranged on one side of the terminal cover shell 2 after the electric arc passes through the arc extinguishing grid pieces 3.

As shown in fig. 5, the arc chute 3 includes a mounting portion 301 and an arc extinguishing portion 302, and the arc extinguishing portion 302 is tile-shaped. And is mounted on the terminal cover case 2 in a tile shape. In this embodiment, the arc extinguishing unit 302 has a single V-shaped tile. The arc extinguishing bars 3 are metal plates, the arc extinguishing part 302 is provided with first round holes 302a, the first round holes 302a are arranged in rows, the intervals between every two rows are staggered, and the arc extinguishing part 302 props against the burr surface of the deionization filter screen 4 to fix the deionization filter screen.

The deionization filter screen 4 is clamped in the groove 201 of the terminal cover shell 2, the groove 201 is positioned at the bottom of the upper plate wall of each partition plate of the terminal cover shell 2, the deionization filter screen 4 is in interference fit with the groove 201, and the deionization filter screen 4 corresponds to the arc extinguishing part 302 and is pressed by the arc extinguishing part 302. As shown in fig. 6, the deionization filter screen 4 is a metal grid plate, diamond-shaped square grooves are formed in the metal grid plate, and the diamond-shaped square grooves are arranged in a staggered mode without intervals.

In the embodiment, the arc extinguishing part of the arc extinguishing grid sheet is tile-shaped and is arranged on the terminal cover shell in the tile shape, so that the arc filtering area is larger, and metal particles can be better adsorbed on the arc extinguishing part when passing through the gradient surface; therefore, the effective utilization area of the grid pieces is increased, a small number of grid pieces are used and are mounted on the short terminal cover, and the same effect as that of mounting a plurality of deionization nets on the long terminal cover is achieved.

It should be noted that, in this embodiment, the number of the arc-extinguishing grid plates 3 and the deionization filter screens 4 is not particularly limited, as long as at least one arc-extinguishing grid plate 3 and at least one deionization filter screen 4 are ensured, and any number of arc-extinguishing grid plates 3 and deionization filter screens 4 are within the scope of the protection of this embodiment as long as the technical effect of this embodiment can be achieved.

Example 2

As shown in fig. 8, the tile shape of the arc extinguishing unit 302 is a semi-circular arc. The other structures and operation principles are the same as those of embodiment 1.

Example 3

As shown in fig. 9, the tile shape of the arc extinguishing portion 302 is formed by connecting a plurality of V-shapes. The other structures and operation principles are the same as those of embodiment 1.

Example 4

As shown in fig. 10, one end of the deionization filter screen 4 is clamped in the clamping groove 304 at one end of the arc chute 3. The other structures and operation principles are the same as those of embodiment 1.

Example 5

The deionization filter 4 is adhered to the terminal housing body 2, and the other structures and operation principles are the same as those of embodiment 1.

The structures, ratios, sizes, quantities, and the like shown in the drawings of the embodiments of the present invention are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance. In addition, the terms such as "upper", "lower", "left", "right", "middle", "clockwise" and "counterclockwise" used in the present specification are for clarity of description only, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not limited by the technical contents of the substantial changes, but also considered to be the scope of the present invention.