CN221747142U - A curtain type arc blocking piece for molded case circuit breaker - Google Patents

Abstract

The utility model discloses a door curtain type arc-blocking piece for a molded case circuit breaker, the door curtain type arc-blocking piece for a molded case circuit breaker comprises a base, the base is provided with a plurality of arc-extinguishing chambers, the arc-extinguishing chambers are provided with arc-extinguishing grids, the arc-extinguishing chambers are provided with filter fences, and are arranged at the outlet of the arc-extinguishing grids, the outlet of the filter fences is provided with arc-blocking pieces, the arc-blocking pieces are provided with movable pieces, and are used for opening and closing to release the pressure of high-temperature and high-pressure gas. The utility model prevents the high-pressure gas generated by the electric arc from carrying high-temperature burning particles or foreign objects to impact the arc-blocking piece through the filter fence, thereby improving the service life of the arc-blocking piece, and the high-temperature and high-pressure gas impacts the movable piece, so that it opens and closes to complete the pressure relief, and reduces the possibility of the arc reigniting, and the movable piece automatically resets after the pressure relief is completed, so that the product has the advantages of improving the breaking capacity and improving the service life of the product.

Description

A curtain type arc blocking piece for molded case circuit breaker

Technical Field

The utility model relates to the technical field of low-voltage electrical appliances, in particular to a door curtain type arc blocking piece for a molded case circuit breaker.

Background Art

The residual current protection molded case circuit breaker is a comprehensive intelligent residual current action circuit breaker with overload protection, short circuit protection, short circuit short delay, overvoltage protection, undervoltage protection, phase loss protection, total voltage loss protection, zero line break protection, surge protection, automatic reclosing, and communication functions. The residual current protection molded case circuit breaker includes a body, a middle cover, a surface cover arranged on the middle cover, an electromagnetic tripping mechanism arranged in the middle cover, an operating mechanism, a contact system, an arc extinguishing system, and a circuit board. The trip unit is a device mechanically connected to the circuit breaker to release the holding mechanism and automatically disconnect the circuit breaker. It is suitable for low-voltage power grids with three-phase four-wire neutral points directly grounded (TT) on the low-voltage side of distribution transformers. It is used to provide indirect contact protection against personal electric shock hazards, and can also protect against grounding faults, overcurrent, short circuits, undervoltage, overvoltage, phase loss, and zero line break on the power supply side of lines or electrical equipment.

When a traditional residual current protection molded case circuit breaker is disconnected due to a short circuit, the high-temperature and high-pressure gas generated by the arc accumulates inside the molded case circuit breaker and cannot be discharged quickly, causing the high-temperature and high-pressure gas to damage the components inside the molded case circuit breaker, thereby reducing the service life of the components inside the residual current protection molded case circuit breaker. Therefore, the applicant has made a beneficial design and found a solution to the above problem. The technical solution to be introduced below was produced in this context.

Summary of the invention

The purpose of the utility model is to overcome the shortcomings of the above-mentioned traditional residual current protection molded case circuit breaker design and provide a product with improved breaking capacity and increased product service life.

To solve the above problems, the utility model adopts the following technical solutions.

A door curtain type arc-blocking plate for a molded case circuit breaker comprises a base, wherein the base is provided with a plurality of arc-extinguishing chambers, the arc-extinguishing chambers are provided with arc-extinguishing grids, the arc-extinguishing chambers are provided with filter fences and arranged at the outlets of the arc-extinguishing grids, the outlets of the filter fences are provided with arc-blocking plates, and the arc-blocking plates are provided with movable plates for opening and closing to release the high-temperature and high-pressure gas.

Preferably, the arc extinguishing chamber has fixed slots on both sides of the inner wall, which are arranged at the outlet of the arc extinguishing grid. The arc extinguishing chamber has a conductive sheet, which is arranged at the outlet of the arc blocking sheet. The conductive sheet has an extension sheet, which is arranged at the bottom of the arc extinguishing grid.

Preferably, the filter fence and the arc-blocking plate are arranged in a fixed slot, so that the filter fence and the arc-blocking plate are connected and fixed to the base.

Preferably, a gap is provided between the movable sheet and the arc-blocking sheet, and the shape of the gap is set to be U-shaped.

Preferably, the filter grid is provided with a plurality of first air leakage holes and second air leakage holes, and the first air leakage holes are evenly distributed in the longitudinal direction and are located above the second air leakage holes.

Beneficial effects:

Compared with the prior art, the beneficial effects of the utility model are:

The utility model prevents the high-pressure gas generated by the electric arc from carrying high-temperature burning particles or foreign objects to impact the arc blocking piece through a filtering fence, thereby increasing the service life of the arc blocking piece. The high-temperature and high-pressure gas impacts the movable piece, causing it to open and close to complete the pressure relief, thereby reducing the pressure inside the residual current protection molded case circuit breaker, preventing the high-temperature and high-pressure gas from damaging the internal components, and reducing the possibility of the electric arc reigniting. When the pressure relief is completed, the movable piece automatically resets to prevent dust from entering the interior of the residual current protection molded case circuit breaker, so that the product has the advantages of improving the breaking capacity and increasing the service life of the product.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the side cross-sectional structure of a curtain-type arc-blocking piece for a molded case circuit breaker of the utility model;

FIG2 is a schematic diagram of the base structure of a curtain-type arc-blocking piece for a molded case circuit breaker of the utility model;

FIG3 is an exploded view of a curtain-type arc-blocking piece for a molded case circuit breaker of the present invention;

The corresponding relationship between the illustrations and component names in the figure is as follows:

Figure numerals: 1, base; 2, arc extinguishing chamber; 3, arc extinguishing grid; 4, filter fence; 5, arc blocking plate; 6, conductive plate; 21, fixed slot; 41, first air leakage hole; 42, second air leakage hole; 51, movable plate; 52, gap; 61, extension plate.

DETAILED DESCRIPTION

The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left" and "right" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, 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 on the present invention.

Referring to the example Figures 1 to 3, a curtain-type arc-blocking piece for a molded case circuit breaker includes a base 1, the base 1 is provided with a plurality of arc-extinguishing chambers 2, the arc-extinguishing chambers 2 are provided with arc-extinguishing grids 3, the arc-extinguishing chambers 2 are provided with filter fences 4, and are arranged at the outlet of the arc-extinguishing grids 3, the outlet of the filter fences 4 is provided with arc-blocking pieces 5, and the arc-blocking pieces 5 are provided with movable pieces 51 for opening and closing the pressure relief of high-temperature and high-pressure gas;

It is worth mentioning that the inner wall of the arc extinguishing chamber 2 is provided with fixed card slots 21 on both sides, and is arranged at the outlet of the arc extinguishing grid 3. The arc extinguishing chamber 2 is provided with a conductive sheet 6, and is arranged at the outlet of the arc blocking sheet 5. The conductive sheet 6 is provided with an extension sheet 61, and is arranged at the bottom of the arc extinguishing grid 3. The fixed card slots 21 play a role in fixing the filter fence 4 and the arc blocking sheet 5. The conductive sheet 6 is connected to the wire, and the extension sheet 61 plays a role in contacting the dynamic spring assembly inside the base 1.

It is worth mentioning that the filter fence 4 and the arc-blocking piece 5 are arranged in the fixed slot 21, so that the filter fence 4 and the arc-blocking piece 5 are connected and fixed to the base 1, and the filter fence prevents the high-temperature burning particles from impacting the arc-blocking piece 5, and the arc-blocking piece 5 releases the high-temperature and high-pressure gas accumulated inside the residual current protection molded case circuit breaker, thereby ensuring the safety of the components inside the residual current protection molded case circuit breaker;

It is worth mentioning that a gap 52 is provided between the movable sheet 51 and the arc-blocking sheet 5, and the shape of the gap 52 is set to be U-shaped. The U-shaped gap 52 facilitates the opening or closing of the movable sheet 51;

It is worth mentioning that the filter grid is provided with a plurality of first air leakage holes 41 and second air leakage holes 42. The first air leakage holes 41 are evenly distributed in the longitudinal direction and are located above the second air leakage holes 42. The first air leakage holes 41 and the second air leakage holes 42 facilitate the passage of high-temperature and high-pressure gas, and at the same time, block large foreign matter and high-temperature hot particles to prevent damage to the arc-blocking plate 5.

The use principle of the utility model is now described as follows:

When the residual current protection molded case circuit breaker is short-circuited and disconnected, the moving spring assembly separates from the extension piece 61, and the arc generated at the moment of disconnection generates high-temperature and high-pressure gas, which is discharged from the outlet of the arc extinguishing grid 3. The high-pressure gas will carry high-temperature hot particles or foreign matter to impact the filter fence 4. The filter fence 4 blocks foreign matter and high-temperature hot particles from impacting the arc blocking piece 5 to prevent the arc blocking piece 5 from being damaged. The high-temperature and high-pressure gas impacts the movable piece 51 through the first air leakage hole 41 and the second air leakage hole 42, so that the movable piece 51 moves outward, opens the connection between the inside and the outside of the residual current protection molded case circuit breaker, achieves the pressure relief effect, and reduces the possibility of arc reignition. After the pressure relief is completed, the movable piece 51 automatically resets to prevent dust from entering.

The above design scheme can enable the product to achieve the advantages of improving the breaking capacity and increasing the service life of the product.

The above content is a further detailed description of the utility model in combination with specific implementation methods. It cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, they can also make several simple deductions or substitutions, which should be regarded as belonging to the scope of protection determined by the claims submitted for the utility model.

Claims (5)

1. The utility model provides a door curtain formula keeps off arc piece for moulded case circuit breaker, includes base (1), base (1) are equipped with a plurality of explosion chamber (2), explosion chamber (2) are equipped with arc extinguishing bars piece (3), its characterized in that: the arc extinguishing chamber (2) is provided with a filtering fence (4) and is arranged at the outlet of the arc extinguishing fence piece (3), the outlet of the filtering fence (4) is provided with an arc blocking piece (5), and the arc blocking piece (5) is provided with a movable piece (51) for opening and closing high-pressure gas.

2. The door curtain type arc blocking piece for the molded case circuit breaker according to claim 1, wherein: the inner wall both sides of explosion chamber (2) are equipped with fixed draw-in groove (21), and set up the exit at arc extinguishing bars piece (3), explosion chamber (2) are equipped with conducting strip (6), and set up the exit at arc shielding piece (5), conducting strip (6) are equipped with extension piece (61), and set up in arc extinguishing bars piece (3) bottom.

3. The door curtain type arc blocking piece for the molded case circuit breaker according to claim 2, wherein: the filtering fence (4) and the arc blocking piece (5) are arranged in the fixing clamping groove (21), so that the filtering fence (4) and the arc blocking piece (5) are fixedly connected with the base (1).

4. The door curtain type arc blocking piece for the molded case circuit breaker according to claim 1, wherein: a gap (52) is arranged between the movable sheet (51) and the arc blocking sheet (5), and the shape of the gap (52) is U-shaped.

5. The door curtain type arc blocking piece for the molded case circuit breaker according to claim 2, wherein: the filter grid sheet is provided with a plurality of first air leakage holes (41) and second air leakage holes (42), and the first air leakage holes (41) are longitudinally and uniformly distributed and are positioned above the second air leakage holes (42).