Description:TITLE OF THE INVENTION

“CIRCUIT BREAKER”

Technical field

The utility model relates to a low-voltage electrical appliance, in particular to a circuit breaker.

Background technique

The circuit breaker is used in the field of power distribution, see figure 1 , it mainly includes the housing 1 and the moving contact installed in the inner space of the housing, the static contact 7 and the arc extinguishing chamber 2 , the circuit breaker passes through the moving contact of the moving contact The connection and disconnection between the contact and the static contact of the static contact to realize the connection and breaking of the current. When the line is overloaded or short-circuited, under the action of the protection unit, the moving contact will be separated from the static contact to generate an arc. At this time, the gas inside the circuit breaker will be ionized under the action of high temperature and strong electric field to generate a large amount of free gas. At the same time, under the action of the arc, a large amount of metal vapor will be generated in the arc extinguishing chamber. If free gas and metal vapor fly out of the circuit breaker through the gas outlet channel opened on the first side wall 13 of the casing (the gas flow path is shown by the arrow in Figure 1 ), it will cause damage to the surrounding circuits and power equipment. Hazards constitute potential safety hazards. At present, it is generally used to install a terminal cover outside the circuit breaker to prevent free gas and metal vapor from diffusing into the surrounding environment of the circuit breaker, but this method will occupy a large installation space and increase the production cost of the circuit breaker.

Utility model content

In order to solve the above problems, the utility model provides a circuit breaker, which is provided with a dissociation member between the arc extinguishing chamber and the gas outlet channel in the inner space of the housing, so as to prevent free gas and metal vapor from flying out through the gas outlet channel circuit breaker to achieve zero arcing function. At the same time, the circuit breaker does not need to increase the original occupied space, and greatly reduces the manufacturing cost.
The utility model provides a circuit breaker, which includes a housing and an arc extinguishing chamber arranged in the inner space of the housing, and an air outlet channel is opened through the first side wall of the housing, and the air outlet channel is designed In order to connect the inner space of the housing with the ambient gas of the circuit breaker, at least one deionization member is arranged between the arc extinguishing chamber and the outlet gas channel, the deionization member being configured to allow conduction Gas passes through it and is designed to cool the conductive gas passing through it.
According to the technical solution of the utility model , by means of arranging at least one de-separation member in the inner space of the housing, it is not necessary to install a terminal cover on the outside of the circuit breaker as in the prior art so as to increase the original occupied space. Further, the technical solution of the utility model only needs to arrange the de-separation parts in a reduced space range, and compared with the prior art, the required materials are reduced, which significantly reduces the manufacturing cost.
Preferably, the debonding member is made of one or both of metal braided mesh and metal foam.
Preferably, the metal braided mesh is made of steel material, and the metal foam is made of steel material, ceramic material or nickel-based alloy.
Preferably, when the metal foam is made of steel material or nickel-based alloy, a ceramic compound coating is also coated on the outer surface of the metal foam.
Preferably, said at least one de-extension member comprises a first de-extension member extending longitudinally through the entirety of said arc chute.
Preferably, the at least one debonding member further comprises a second debonding member arranged at a first end of the outlet channel close to the inner space of the housing.
Preferably, an insulating sheet is arranged at the first end of the air outlet channel, and at least one air inlet hole is opened through the insulating sheet, and the air inlet hole is in gas communication with the air outlet channel, wherein the insulating sheet A tab is disposed between the first end portion and the second delamination member.
Preferably, the circuit breaker further includes a support frame on which the first de-separation member is fixedly installed, and the first de-separation member is accommodated inside the housing in a relatively non-movable manner by means of the support frame in space.
Preferably, the housing includes a base and a cover above the base, and the air outlet channel is opened on a vertically extending section of the cover. The circuit breaker also includes a static contact located below the arc extinguishing chamber in the inner space of the housing, the cover has a second side wall extending above the arc extinguishing chamber, and the support frame is The first limiting member fixedly mounted to the static contact and the second limiting member fixedly mounted to the second side wall are positioned in a non-movable position with respect to the housing.
Preferably, the second freeing member is clamped between the lower surface of the second side wall and the upper end surface of the base facing the cover in a relatively non-movable manner.

Description of drawings

Embodiments of the device and method of the present utility model are further described in detail in conjunction with the accompanying drawings, wherein:
FIG. 1 is a schematic diagram of the internal structure of a circuit breaker in the prior art;
Fig. 2 is a schematic diagram of the internal structure of the circuit breaker according to the utility model;
Fig. 3 is the enlarged schematic diagram of the dotted box part in Fig. 2 ;
Fig. 4 is the schematic diagram of the assembly of the first de-separation part and the support frame;
Fig. 5 and Fig. 6 are respectively the schematic diagrams of the second deionizing member and insulating sheet viewed from different angles;
Fig. 7 is a schematic diagram of an arc extinguishing chamber in the prior art.

List of reference numerals
1. Shell; 11. Base; 12. Cover; 13. First side wall; 14. Second side wall; 2. Arc extinguishing chamber; 21. Arc extinguishing chamber side plate ; .Second De-separation Part; 5. Supporting Frame; 6. Insulation Sheet; 7. Static Contact; 8. First Limiting Part; 9. Second Limiting Part.

Detailed description

Referring now to the accompanying drawings, the schematic scheme of the structure disclosed in the utility model will be described in detail. Although the drawings are provided to illustrate some embodiments of the invention, the drawings are not necessarily to scale of particular embodiments and certain features may be exaggerated, removed, or partially sectioned to better illustrate and explain the invention. New type of public content.
Certain directional terms used hereinafter to describe the drawings are to be understood to have their normal meanings and refer to those directions with which the drawings are normally viewed. For example, "upper," "lower," "left," and "right" refer to upper, lower, left-hand, and right-hand sides when viewing FIGS. 1 and 2 , respectively.
In addition, free gas, metal vapor, and other conductive gases that may be generated in the arc extinguishing chamber due to high-temperature arcs are collectively referred to as conductive gases in this article.
Fig. 2 shows a schematic structural diagram of a circuit breaker according to the present invention. Similar to the prior art, the circuit breaker includes a housing 1 and an arc extinguishing chamber 2 arranged in the inner space of the housing 1 , wherein the arc extinguishing chamber 2 is arranged in the inner space of the housing 1 in a relatively non-movable manner . A static contact 7 and a moving contact are also fixedly arranged in the housing 1 . The housing 1 has a first side wall 13 , on which a gas outlet channel is opened, through which the conductive gas to be generated inside the housing 1 can flow from the inner space of the housing 1 to the surrounding environment of the circuit breaker .
Usually, one of the vertically extending side walls of the housing 1 is selected as the first side wall 13 , and the gas outlet channel is located obliquely above the arc extinguishing chamber 2 on the first side wall 13 , and its specific location can be seen in FIG. 1 . Of course, those skilled in the art should understand that the possible arrangement positions of the air outlet channels are not limited to the situation shown in FIG. 1 . Preferably, the housing 1 includes a base 11 and a cover 12 , wherein the cover 12 is located above the base 11 . The cover 12 may comprise a second side wall 14 extending above the arc chamber 2 and a vertically extending section. The air outlet channel is opened on the vertically extending section of the cover body 12 .
Continuing to refer to FIG. 3 , in order to prevent the conductive gas from flying out of the housing 1 through the gas outlet channel, at least one deionization member is arranged between the arc extinguishing chamber 2 and the gas outlet channel, which can allow the conductive gas to pass through it and can also Conductive gas passes through it for cooling.
Specifically, a metal braided mesh can be selected as the de-separating member, and FIG. 4 shows the configuration when the de-separating member adopts a metal braided mesh. Conductive gas can pass through the metal braided mesh through the various mesh holes.
In addition, the deionizing member can also be made of metal foam, which has a large number of pores, and the pores can be connected together to form a through channel through which conductive gas can pass through the metal foam.
In addition, the de-separation member can also be formed by superimposing a plurality of metal plates, wherein each metal plate needs to have several through holes, and the through holes on each metal plate must be able to be connected into at least one through hole when the metal plates are stacked together. Channels to allow conductive gases to pass through.
The above-mentioned metal braided mesh or metal plate is preferably made of steel, copper and other materials, especially steel material.
Metal foam can be made of steel materials, ceramic materials or nickel-based alloys. When the foam material is made of steel material or nickel-based alloy, a ceramic compound coating is also coated on the outer surface of the metal foam. The ceramic compound coating has high-temperature-resistant physical properties, which can improve the high-temperature resistance of foamed metals.
The deionization member with the above properties can cool the conductive gas passing through it, so that the dissociation gas is deionized, or the metal vapor is turned into large metal particles, so that it stays inside the product.
The following describes the preferred arrangement of the debonding member in detail, but is not limited to the following situations.
Referring to FIG. 3 , a first de-separation member 3 is provided between the arc extinguishing chamber 2 and the gas outlet channel, and the first de-separation member 3 extends longitudinally and passes through the entire arc extinguishing chamber 2 . As a result, the conductive gas generated from the arc extinguishing chamber 2 must pass through the first deionizing member 3 before entering the gas outlet channel.
In addition, preferably, a second de-separation member 4 is provided at the first end of the air outlet channel close to the inner space of the housing 1 . Thus, by means of additionally adding a second deionizing member 4 at the first end of the gas outlet channel close to the inner space of the housing 1 , it is more guaranteed that the conductive gas escapes to the external environment through the gas outlet channel under various arc conditions. All have been fully deionized to achieve "zero flashover".
It is known in the prior art that an insulating sheet 6 has been arranged at the first end . Referring to Fig. 5 and Fig. 6 , several air inlet holes are opened on the insulating sheet 6 , and the air inlet holes can be gas-communicated with the air outlet channel so that Does not block the gas in and out of the gas channel. The insulating sheet 6 can prevent foreign matter in the surrounding environment from entering the inner space of the casing through the air outlet channel. In the case where the second debonding member 4 is provided, the insulating sheet 6 may be arranged between the first end of the air outlet channel and the second debonding member 4 .
Those skilled in the art should understand that the first de-stripping element 3 and the second de-stripping element 4 are not necessarily made of the same material and configuration. For example, the first de-stripping element 3 can be made of copper metal braid, and the second de-stripping element 4 can be made of steel foam metal. In addition, according to factors such as desired deionization effect, selected material, and material thickness, multiple first deionization components 3 and multiple second deionization components 4 may be provided .
Referring to Fig. 3 and Fig. 4 , this paper also provides a supporting frame 5 . The first de-separating member 3 can be fixedly mounted to the support frame 5 , for example, embedded in the support frame 5 , so as to be accommodated in the inner space of the housing 1 in a relatively non-movable manner by means of the support frame 5 .
For example, the support frame 5 can be directly fixedly connected to the housing 1 and / or the static contact 7 located below the arc extinguishing chamber 2 by means of fastening means, such as screws or clamps . The support frame 5 can also be directly fixedly mounted to the arc extinguishing chamber side plate 21 of the arc extinguishing chamber 2 shown in FIG. 7 .
In addition, preferably, a first limiting member 8 and a second limiting member 9 are respectively provided , wherein the first limiting member 8 is fixedly installed on the static contact 7 , and the second limiting member 9 is fixedly installed on the second side of the housing 1 The wall 14 , the lower frame and the upper frame of the support frame 5 are restricted from relative movement relative to the housing 1 through shape fit with the first limiting member 8 and the second limiting member 9 respectively. For example, as shown in Fig. 3 , the first limiting member 8 limits the leftward movement of the lower frame, the second limiting member 9 limits the rightward movement of the upper frame, and the support frame 5 is also dimensionally designed as the upper frame. The upper end surface and the lower end surface of the lower frame abut against the second limiting member 9 and the first limiting member 8 respectively so as to be restricted from moving in the up and down direction.
The second debonding element 4 can also be connected to the housing 1 by means of other means . However, limited by space, it is preferred that the second de- separation member 4 is clamped between the lower surface of the second side wall 14 and the upper end surface of the base 11 facing the cover 12 .
Since the de-separation element is arranged in the inner space of the housing, there is no need to increase the original occupied space. Less material is required, greatly reducing manufacturing costs.

, Claims:CLAIMS

We Claim:

1. A circuit breaker, characterized in that it comprises a housing ( 1 ) and an arc extinguishing chamber ( 2 ) arranged in the inner space of the housing ( 1 ), on the first side wall of the housing ( 1 ) ( 13 ) There is a gas outlet channel through the upper part, and the gas outlet channel is designed to connect the inner space of the casing ( 1 ) with the ambient gas of the circuit breaker, and the arc extinguishing chamber ( 2 ) and the gas outlet Arranged between the passages is at least one debasing member configured to allow the passage of conductive gas therethrough and designed to cool the conductive gas passing therethrough.
2. The circuit breaker according to claim 1 , characterized in that, the deslipping member is made of one or both of metal braided mesh and metal foam.
3. The circuit breaker according to claim 2 , wherein the metal braided mesh is made of steel material, and the metal foam is made of steel material, ceramic material or nickel-based alloy.
4. The circuit breaker according to claim 3 , wherein when the metal foam is made of steel material or nickel-based alloy, the outer surface of the metal foam is further coated with a ceramic compound coating.
5. The circuit breaker according to any one of claims 1 to 4 , wherein said at least one decoupling member comprises a first decoupling member extending longitudinally across the entirety of said decoupling member. arc chamber.
6. The circuit breaker according to claim 5 , wherein the at least one de-spooling member further comprises a second de-spooling member, and the second de-spooling member is arranged in the air outlet channel close to the housing the first end of the interior space.
7. The circuit breaker according to claim 6 , wherein an insulating sheet is arranged at the first end of the air outlet channel, and at least one air inlet hole is opened through the insulating sheet, and the air inlet A hole is in gas communication with the outlet channel, wherein the insulating sheet is disposed between the first end portion and the second deionizer.
8. The circuit breaker according to claim 7 , characterized in that, the circuit breaker further comprises a support frame on which the first de-separation member is fixedly installed, and the first de-separation member is supported by the support frame The frame is accommodated in the inner space of the housing in a relatively immovable manner.
9. The circuit breaker according to claim 8 , wherein the housing comprises a base and a cover above the base, the air outlet channel is opened on a vertically extending section of the cover, The circuit breaker also includes a static contact located below the arc extinguishing chamber in the inner space of the housing, the cover has a second side wall extending above the arc extinguishing chamber, and the support frame is The first limiting member fixedly mounted to the static contact and the second limiting member fixedly mounted to the second side wall are positioned in a non-movable position with respect to the housing.
10. The circuit breaker according to claim 9 , characterized in that, the second de-slipping member is clamped between the lower surface of the second side wall and the base toward the cover in a non-movable manner. between the upper end faces.