CN108695124B

CN108695124B - Optimized breaker layout structure

Info

Publication number: CN108695124B
Application number: CN201810626277.3A
Authority: CN
Inventors: 孙吉升; 张森林
Original assignee: Shanghai Electrical Apparatus Research Institute Group Co Ltd
Current assignee: Shanghai Electrical Apparatus Research Institute Group Co Ltd
Priority date: 2018-06-15
Filing date: 2018-06-15
Publication date: 2023-09-08
Anticipated expiration: 2038-06-15
Also published as: CN113593977A; CN113593977B; CN108695124A

Abstract

The invention discloses an optimized circuit breaker layout structure, which comprises an arc extinguishing system, a fixed contact, a moving contact, a mechanism, a release and a rotating shaft, and is characterized by further comprising a left cover and a right cover, wherein the left cover and the right cover are mutually butted in the left direction and the right direction to form an integral structure, the release and the mechanism are arranged outside the integral structure, and the arc extinguishing system, the fixed contact, the moving contact and the rotating shaft are arranged in the integral structure. The invention also provides an optimized breaker layout structure with an N-level structure, wherein N is more than or equal to 2 and less than or equal to 4, and the breaker layout structure is characterized by comprising N integral structures, all the integral structures are arranged side by side, and the tripper and the mechanism are arranged outside any integral structure. The invention has the following advantages: good isolation performance; excellent insulation capability between the interphase and the in-out line; the breaking capacity is higher under the high voltage level; the problem of particle blowback is solved.

Description

Optimized breaker layout structure

Technical Field

The invention relates to a layout structure of devices of a molded case circuit breaker.

Background

With the continuous development of the market, plastic case circuit breakers with high voltage class, such as AC1150V, DC V, etc., are required in more and more occasions. Most manufacturers in the industry derive products directly from existing mature molded case circuit breakers, but do not work well in these applications because of more or less quality problems with these derivatives, such as: the insulation capability is insufficient, the breaking capability is low (under the existing structural form, arc extinguishing chambers with enough capacity cannot be arranged), and even the most basic isolation performance is compromised.

The structure of the single-breakpoint molded case circuit breaker commonly used in the market at present is shown in fig. 1, 2 and 3, the whole structure is installed in an up-down mode, namely, the upper cover 1 is in up-down butt joint with the base 2, and the arc extinguishing system 3, the fixed contact 4, the moving contact 5, the mechanism 6, the release 7 and the rotating shaft 8 are all together and are placed in a cavity between the upper cover 1 and the base 2. As shown in fig. 4, in the upper cover 1 and the base 2, the arc extinguishing system 3, the fixed contact 4, the moving contact 5, the mechanism 6, the release 7 and the rotating shaft 8 are arranged in a left, middle and right mode, and the installation space of the arc extinguishing system 3 is limited.

The derivative products like those shown in fig. 1 to 3 have some other problems, such as: the mechanism 6, the rotating shaft 8 and the arc extinguishing system 3 are arranged in the same cavity, and the exhaust ports of the circuit breaker are all arranged near the wiring terminals of the circuit breaker (as shown in figure 3), so when the exhaust ports of the arc gas in the advancing direction are difficult to discharge rapidly, the arc gas moves to other exhaust ports or is blown into gaps of a shell, arc particles are burned or stuck to the mechanism 6 or the rotating shaft 8 after being reversely blown, and under the condition of large short-circuit current, the rotating shaft 8 is burned seriously by the arc reverse blowing, and even the thermal magnetic release 7 is blown by the arc reverse blowing, so that the circuit breaker loses the basic switching function.

Disclosure of Invention

The purpose of the invention is that: the novel layout of each device of the molded case circuit breaker ensures that the molded case circuit breaker has excellent isolation performance under the application of high voltage class, has higher and reliable breaking capacity, and solves the problem of back blowing of arc particles.

In order to achieve the above purpose, the technical scheme of the invention provides an optimized circuit breaker layout structure, which comprises an arc extinguishing system, a fixed contact, a moving contact, a mechanism, a release and a rotating shaft, and is characterized by further comprising a left cover and a right cover, wherein the left cover and the right cover are mutually butted in the left and right directions to form an integral structure, the release and the mechanism are arranged outside the integral structure, and the arc extinguishing system, the fixed contact, the moving contact and the rotating shaft are arranged in the integral structure, wherein:

an upper installation space and a lower installation space are formed in the integral structure, and the volume of the lower installation space is about 1/2 of the volume of the whole product; the rotating shaft cavity is positioned in the upper installation space; the fixed contact and the relatively closed arc-extinguishing chamber cavity are positioned in the lower installation space; meanwhile, the rotating shaft cavity and the arc extinguishing chamber cavity are independent from each other, and only a gap for the movement of the moving contact is formed;

the rotating shaft is arranged in the rotating shaft cavity; the arc-extinguishing chamber is arranged in the arc-extinguishing chamber cavity; the static contact is wrapped by the materials of the left cover and the right cover, only the static contact is exposed, and the non-connecting or contact part of the static contact is effectively wrapped by the insulating materials of the left cover and the right cover, so that good insulating performance is ensured, and meanwhile, the static contact is protected from being burnt by an electric arc.

Preferably, an upper air outlet channel communicated with the arc-extinguishing chamber cavity is arranged at the upper part of the left cover and the right cover after being in butt joint, and a lower air outlet channel communicated with the arc-extinguishing chamber cavity is arranged at the lower part of the left cover and the right cover after being in butt joint, so that the communication paths of the upper air outlet channel and the lower air outlet channel are free of other breaker components except the arc-extinguishing chamber, double-side air outlet is realized in a single breakpoint mode, pressure is released quickly, and the transfer arc speed is quick.

Preferably, the contact position of the moving contact and the fixed contact is arranged in the middle of the arc-extinguishing chamber cavity of the circuit breaker so as to obtain the maximum volume of the arc-extinguishing chamber, and when the moving contact is opened, the electric arc can be transferred up and down to the circuit breaker at the same time.

The invention also provides an optimized breaker layout structure with an N-level structure, wherein N is more than or equal to 2 and less than or equal to 4, and the breaker layout structure is characterized by comprising N integral structures, all the integral structures are arranged side by side, and the tripper and the mechanism are arranged outside any integral structure.

Compared with the existing molded case circuit breaker, the invention has the following advantages: 1. good isolation performance; 2. excellent insulation capability between the interphase and the in-out line; 3. the breaking capacity is higher under the high voltage level; 4. the problem of particle blowback is solved.

Drawings

Fig. 1 is a schematic diagram of a conventional molded case circuit breaker, in which an upper cover 1 and a base 2 are vertically abutted;

fig. 2 is a schematic diagram of a conventional molded case circuit breaker, in which an upper cover 1 is not docked with a base 2;

fig. 3 is an internal schematic view of a conventional molded case circuit breaker;

fig. 4 is a simplified overall layout of a conventional molded case circuit breaker;

FIG. 5 is a schematic view of the overall structure of the present invention;

FIG. 6 is a simplified overall layout of the present invention;

FIG. 7 is a schematic view of the overall structure of the present invention, in which the left cover 9 and the right cover 10 are butted left and right;

fig. 8 is a schematic view of the overall structure of the present invention, in which the left cover 9 and the right cover 10 are not butted;

FIG. 9 is a schematic view of the internal structure of the present invention;

FIG. 10 is a schematic diagram of the up and down air outlet of the present invention, wherein the dashed arrows are schematic diagrams of the air flow movement;

fig. 11 is a schematic diagram of a molded case circuit breaker with a two-pole structure provided by the invention;

FIG. 12 is a schematic view of the inner portion of the present invention without the cover;

fig. 13 is a schematic view of an arc chute of the present invention, not shown in the interior thereof, wherein 13 is a narrow gap outer wall.

Detailed Description

In order to make the invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.

As shown in fig. 4, the optimized circuit breaker layout structure provided by the invention comprises a mechanism 6, a release 7 and an integral structure, wherein an arc extinguishing system 3, a fixed contact 4, a moving contact 5 and a rotating shaft 8 are arranged in the integral structure. Referring to fig. 5, the overall layout of the present invention is that the present invention is provided with an inner part and an outer part (the mechanism 6, the release 7 and the arc extinguishing system 3, the fixed contact 4, the moving contact 5 and the rotating shaft 8 which are positioned at the outside), and is provided with an upper part and a lower part (the mechanism 6, the release 7, the rotating shaft 8 and the arc extinguishing system 3 and the fixed contact 4 which are positioned at the lower part), wherein the arc extinguishing system is provided with two air-blowing side plates 11, and the air-blowing side plates 11 form a narrow slit 12 which only allows the moving contact to pass through.

The invention sets the arc extinguishing system 3, the fixed contact 4 and the rotating shaft 8 as inner parts, sets the mechanism 6 and the release 7 as outer parts, and separates the two parts completely, meanwhile, the rotating shaft 8, the fixed contact 4 and the arc extinguishing system 3 are in a relatively separated state (compared with a derivative product, the invention provides the rotating shaft cavity 10-1 of the product which is smaller, has no larger hole for gas leakage, and avoids the possibility of back spraying of a large number of charged particles when breaking occurs).

Meanwhile, the arc extinguishing system 3 and the fixed contact 4 are the lower half part, the rotating shaft 8, the mechanism 6 and the release 7 are the upper half part, the arc extinguishing chamber of the arc extinguishing system 3 completely occupies the lower half part, the arrangement scheme of the most number of grid plates is obtained under the condition that the overall appearance size of a product is not increased, the capacity of the arc extinguishing chamber is maximized, the high-voltage breaking reliability is improved, and the design brings another benefit that the arc extinguishing chamber is arranged on a communication path of an upper air outlet channel and a lower air outlet channel, other breaker components are not arranged, double air outlets can be simultaneously used for air outlet, rapid pressure relief can be realized, elongated electric arcs can uniformly enter the arc extinguishing chamber, and meanwhile, the transfer speed of the electric arcs can be accelerated.

Specifically, with reference to fig. 7 and 8, the entire structure is mounted in a left-right manner, and includes a left cover 9 and a right cover 10. The left cover 9 and the right cover 10 are butted with each other in the left-right direction to form an integral structure. The arc extinguishing system 3, the fixed contact 4, the moving contact 5 and the rotating shaft 8 are positioned in the integral structure; the mechanism 6 and the release 7 are positioned outside the whole structure. Meanwhile, an upper installation space and a lower installation space are formed in the integral structure, and the volume of the lower installation space is about 1/2 of the volume of the whole product. The upper installation space is mainly used for accommodating the rotating shaft cavity 10-1, the volume is smaller, the lower installation space is mainly used for accommodating the arc extinguishing chamber cavity 9-1 and the fixed contact 4, the volume is larger, and the upper installation space and the lower installation space are communicated through narrow slits which only allow the moving contact to pass through, so that a part of the moving contact is positioned in the upper installation space, and a part of the moving contact is positioned in the lower installation space. More preferably, if the upper installation space and the lower installation space are sealed, an interlayer can be arranged between the upper installation space and the lower installation space, and a baffle plate (not shown) which can move along with the follow-up contact is arranged between the interlayer to cover the narrow slit. The invention also arranges the mechanism 6 and the release 7 outside the whole structure, ensures insulation and reliably protects the mechanism 6 from being damaged by high-temperature particles generated by breaking.

In this way, the rotating shaft cavity 10-1, the mechanism 6 and the release 7 are arranged front and back on the monopole current path, and are positioned at the same height and at the same side of the arc extinguishing chamber cavity 9-1.

Referring to fig. 9 and 10, a sealed shaft cavity 10-1 is used to place the shaft 8, and a sealed arc extinguishing chamber cavity 9-1 is used to place the arc extinguishing system 3, so that when a short circuit occurs, an arc generated between contacts can only be transferred to air outlets at the upper end and the lower end (i.e., the direction of the arc extinguishing chamber) under the action of electromagnetic force and air pressure. Thus, the rotating shaft system and the flexible connecting wires are reliably protected from being damaged by high-temperature particles generated by breaking. Meanwhile, the invention adopts a completely closed cavity design, effectively wraps arc particles generated by breaking, and has excellent interphase insulating capability. And the arc-extinguishing chamber cavity 9-1 is hermetically designed to maximize the arc-extinguishing system and form an extremely high arc-extinguishing chamber capacity scheme.

As shown in fig. 8 and 9, the fixed contact 4 is wrapped by the left cover 9 and the right cover 10, only the fixed contact is exposed, the fixed contact 4 is not burned by an electric arc during breaking, and when the circuit breaker is in an open position, the whole product has a large opening distance, and good and reliable insulating capability is provided between the inlet and outlet lines. As shown in FIG. 10, the invention adopts the up-and-down gas outlet to quickly transfer high-temperature and high-pressure gas, as shown by the dotted arrow in FIG. 10. Specifically, an upper air outlet channel 9-2 communicated with the arc-extinguishing chamber cavity 9-1 is arranged at the upper part of the product, a lower air outlet channel 9-3 communicated with the arc-extinguishing chamber cavity 9-1 is arranged at the lower part of the product, and the narrow slits are only communicated by the narrow slits or shielded by the shielding plate between the rotating shaft cavity 10-1 and the arc-extinguishing chamber cavity 9-1, so that the gap between the two cavities is very small and is far smaller than the air outlet on the air outlet channel, and the arc-extinguishing chamber cavity 9-1 occupies a large space at the lower part of the circuit breaker, so that arc gas cannot enter the rotating shaft cavity 10-1.

The circuit breaker layout of the single stage structure is given above. The layout mode of the invention is also suitable for the circuit breaker with a two-pole, three-pole or even four-pole structure. For the circuit breaker with the secondary structure, as shown in fig. 11, the circuit breaker can be realized by adopting two integral structures, the two integral structures are arranged side by side, and the release 7 and the mechanism 6 are arranged outside any integral structure.

Claims

1. The utility model provides an optimized circuit breaker layout structure, including arc extinguishing system (3), static contact (4), moving contact (5), mechanism (6), release (7) and pivot (8), its characterized in that still includes left lid (9) and right lid (10), and left lid (9) and right lid (10) dock each other in left and right direction and form overall structure, and outside overall structure was located to release (7) and mechanism (6), arc extinguishing system (3), static contact (4), moving contact (5) and pivot (8) were located overall structure, wherein:

an upper installation space and a lower installation space are formed in the integral structure, and the volume of the lower installation space is 1/2 of the whole product volume; the rotating shaft cavity (10-1) is positioned in the upper installation space; the fixed contact (4) and the relative closed arc-extinguishing chamber cavity (9-1) are positioned in the lower installation space; the rotating shaft cavity (10-1) and the arc extinguishing chamber cavity (9-1) are independent from each other;

the rotating shaft (8) is arranged in the rotating shaft cavity (10-1); the arc extinguishing system (3) is arranged in the arc extinguishing chamber cavity (9-1); the static contact (4) is wrapped by the materials of the left cover (9) and the right cover (10), and only the static contact is exposed.

2. An optimized circuit breaker arrangement as claimed in claim 1, characterized in that an upper gas outlet channel (9-2) communicating with said arc-extinguishing chamber cavity (9-1) is provided in the upper part of said left and right covers after they are docked, and a lower gas outlet channel (9-3) communicating with said arc-extinguishing chamber cavity (9-1) is provided in the lower part of said left and right covers after they are docked.

3. An optimized circuit breaker arrangement as claimed in claim 1, characterized in that the contact position of the moving contact (5) with the stationary contact (4) is arranged in the middle of the arc-extinguishing chamber cavity (9-1).

4. An optimized breaker layout structure with an N-level structure, N is more than or equal to 2 and less than or equal to 4, and is characterized by comprising N integrated structures formed by the breaker layout structure according to claim 1, wherein all the integrated structures are arranged side by side, and the tripper (7) and the mechanism (6) are arranged outside any one integrated structure.