CN115116807A - Arc control device and circuit breaker - Google Patents

Abstract

The invention belongs to the technical field of low-voltage electrical appliances, and discloses an arc extinguishing device and a circuit breaker. The arc extinguishing device comprises an arc extinguishing grid plate, a mounting shell, a heat dissipation plate and a heat dissipation strip; a plurality of arc-extinguishing grid plates are arranged in parallel at intervals, and the left end and the right end of each arc-extinguishing grid plate are provided with bumps; the mounting shell comprises a first plate, a second plate arranged opposite to the first plate, a first connecting plate and a second connecting plate arranged opposite to the first connecting plate, the mounting shell is formed by the first plate, the second plate, the first connecting plate and the second connecting plate in an enclosing mode, and the arc extinction grid plate is arranged in the mounting shell; the first plate and the second plate are provided with a plurality of through grooves; the heat dissipation plates are oppositely arranged and respectively close to the first plate and the second connecting plate, and through grooves are formed in the heat dissipation plates; the plurality of heat dissipation strips are arranged between the adjacent arc extinguishing grid plates; the lug can penetrate through the through groove and extend into the through groove; the both ends of heat dissipation strip can run through logical groove. The invention accelerates the cooling speed between the arc-extinguishing grid plates and prolongs the service life of the circuit breaker.

Description

Arc control device and circuit breaker

Technical Field

The invention relates to the technical field of low-voltage electric appliances, in particular to an arc extinguishing device and a circuit breaker.

Background

The circuit breaker is a switching device capable of closing, bearing and breaking a current under a normal circuit condition and closing, bearing and breaking a current under an abnormal circuit condition within a specified time, and can be used for distributing electric energy, starting an asynchronous motor infrequently, protecting a power supply circuit, a motor and the like, and automatically breaking a circuit when an electrical appliance is seriously overloaded or has faults such as short circuit, undervoltage and the like.

When the circuit breaker is disconnected because the circuit current is unusual, sound contact is from the closure state conversion to the separation state, in the twinkling of an eye of separation state, because release a large amount of electric energy between the contact clearance, the release of this kind of electric energy is usually accomplished in high temperature, high-pressure heavy current form is in the twinkling of an eye, this electric current is called electric arc, because the energy of electric arc release in the twinkling of an eye between sound contact is great, the temperature is higher, it is very easy to burn contact and the inside insulation system of circuit breaker, puncture insulation system, thereby lead to the short circuit between the circuit breaker utmost point looks, cause the circuit breaker product directly to scrap, can take place the explosion accident even, cause serious personnel and equipment safety problem.

In the prior art, an arc extinguishing device or an arc chute plate is usually arranged inside a circuit breaker, but the prior arc extinguishing device has the following problems: when the arc extinguishing grid plate is in the working process, the temperature of the inner part of the arc extinguishing grid plate can rise instantly when the arc is extinguished, and particularly, the arc extinguishing chamber between the adjacent arc extinguishing grid plates is poor in air fluidity and slow in cooling speed, and long-time high temperature easily causes metal oxidation on the surface of the arc extinguishing grid plate, so that the service life of the arc extinguishing grid plate is greatly influenced.

Disclosure of Invention

The invention aims to provide an arc-extinguishing device and a circuit breaker, which are used for accelerating the cooling speed between arc-extinguishing grid plates and prolonging the service life of the circuit breaker.

In order to achieve the purpose, the invention adopts the following technical scheme:

an arc extinguishing apparatus for arc extinction of a circuit breaker, comprising:

the arc extinguishing grid plates are arranged in parallel at intervals, and the left end and the right end of each arc extinguishing grid plate are provided with convex blocks;

the mounting shell comprises a first plate, a second plate arranged opposite to the first plate, a first connecting plate and a second connecting plate arranged opposite to the first connecting plate, the mounting shell is formed by the first plate, the second plate, the first connecting plate and the second plate in a surrounding mode, and the arc-extinguishing grid plate is arranged in the mounting shell; the first plate and the second plate are provided with a plurality of through grooves;

the two heat dissipation plates are oppositely arranged and respectively close to the first plate and the second connecting plate, and penetrating grooves are formed in the heat dissipation plates;

the heat dissipation strips are arranged between the adjacent arc extinguishing grid plates;

the lug can penetrate through the through groove and extend into the through groove; the two ends of the heat dissipation strip can penetrate through the through groove.

As a preferable scheme of the arc extinguishing device, a through hole is formed in the heat dissipation strip, and the through hole is in a long strip shape.

As a preferred scheme of the arc extinguishing device, connecting columns are arranged at two ends of the heat dissipation strip and can penetrate through the through grooves.

As a preferable scheme of the arc extinguishing device, a connecting groove is formed in one side of the heat dissipation plate, which is close to the mounting housing, and the connecting column can extend into the connecting groove.

As an optimal scheme of an arc extinguishing device, one side of the heat dissipation plate, which is far away from the installation shell, is provided with a clamping strip, the clamping strip extends along the width direction of the heat dissipation plate, and the clamping strip can be matched with a positioning groove of the breaker shell so that the heat dissipation plate is fixed.

As a preferred scheme of the arc extinguishing device, the arc extinguishing grid plate is provided with a V-shaped groove, and the V-shaped groove extends from the top end to the bottom end of the arc extinguishing grid plate.

As a preferable scheme of the arc extinguishing device, the heat dissipation plate and the heat dissipation strip are made of rubber.

The utility model provides a circuit breaker, includes upper housing and installation base, still includes any above-mentioned scheme arc control device, arc control device is fixed in the upper housing, the installation base can with upper housing lock, so that arc control device hold in the inside of circuit breaker.

As a preferred scheme of the circuit breaker, a plurality of first heat dissipation holes are formed in the position, corresponding to the arc extinguishing device, of the upper shell, a plurality of second heat dissipation holes are formed in the position, corresponding to the arc extinguishing device, of the mounting base, and the first heat dissipation holes and the second heat dissipation holes are used for heat dissipation of the arc extinguishing device.

As the preferred scheme of a circuit breaker, be equipped with first constant head tank on going up the casing, be equipped with the second constant head tank on the installation base, two the heating panel can block into respectively first constant head tank with the second constant head tank, so that arc control device location.

Has the advantages that:

in the invention, the left end and the right end of an arc extinguishing grid plate of an arc extinguishing device are provided with lugs, the arc extinguishing grid plate is arranged in a mounting shell, a first plate and a second plate of the mounting shell are provided with through grooves, two heat dissipation plates are oppositely arranged and respectively close to the first plate and the second plate, the heat dissipation plates are provided with through grooves, and the lugs can penetrate through the through grooves and extend to the through grooves; in addition, the heat dissipation strip is arranged between adjacent arc extinguishing grid plates, and two ends of the heat dissipation strip can penetrate through the through groove; when an electric arc occurs near the arc extinguishing device, a large amount of heat is generated and is transferred to the arc extinguishing grid plate and is transferred to the heat dissipation plate through the convex block, the heat dissipation plate is in contact with the outside air, the heat transfer of the internal electric arc is accelerated, and in addition, the heat can be further transferred to the heat dissipation plate through the heat dissipation strip, so that the heat transfer is further accelerated; effectively promote the radiating effect to promote the whole life of circuit breaker.

Drawings

Fig. 1 is an exploded view of an arc extinguishing device according to an embodiment of the present invention;

FIG. 2 is an exploded view of an arc extinguishing device with a hidden heat dissipation plate according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an arc extinguishing device according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a base according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a circuit breaker with a hidden base according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a circuit breaker with an arc extinguishing device according to an embodiment of the present invention;

fig. 7 is an overall structural diagram of a circuit breaker according to a first embodiment of the present invention.

In the figure:

1. an upper housing; 10. a first heat dissipation hole; 11. an insulating plate, 12 and a limiting plate; 13. a placement groove; 14. a first positioning groove;

2. installing a base; 20. a second heat dissipation hole; 21. a second positioning groove;

3. a wrench;

4. a power-on mechanism; 41. an incoming terminal; 42. an outlet terminal; 43. a conductive plate; 44. carrying out static contact; 45. a moving contact; 46. a trip unit;

100. an arc extinguishing grid; 110. a bump; 120. a V-shaped groove;

200. installing a shell; 210. a first plate; 220. a second plate; 230. a first connecting plate; 240. a second connecting plate; 250. a through groove;

300. a heat dissipation plate; 310. a through groove; 320. connecting grooves; 330. clamping the strip;

400. a heat dissipating strip; 410. a through hole; 420. connecting columns.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Example one

Referring to fig. 1 to 4, in the present embodiment, the arc extinguishing apparatus (hereinafter referred to as "apparatus") is used for arc extinguishing of a circuit breaker, and specifically includes: a plurality of arc-extinguishing louvers 100, a mounting case 200, two heat dissipation plates 300, and a plurality of heat dissipation bars 400. The arc-extinguishing grating 100 is arranged in parallel and at intervals, the left end and the right end of the arc-extinguishing grating 100 are provided with a plurality of bumps 110, optionally, the number of the bumps 110 of the arc-extinguishing grating 100 can be multiple, in this embodiment, the number of the bumps 110 on one side of the arc-extinguishing grating 100 is two, and a certain distance is kept between the two bumps 110, so as to improve the heat dissipation effect; alternatively, the shape of the protrusion 110 may be square, and the protrusion 110 and the arc chute 100 are integrally formed; a plurality of arc chute 100 are parallelly arranged and the interval sets up, form the arc extinguishing bin each other, and the person of skill in the art can carry out the pertinence selection to the quantity of arc chute 100 according to the specific structure of circuit breaker and the size in arc extinguishing space, and the no longer repeated here.

Mounting housing 200 includes a first plate 210, a second plate 220 disposed opposite to first plate 210, a first connection plate 230, and a second connection plate 240 disposed opposite to first connection plate 230, mounting housing 200 is defined by first plate 210, second plate 220, first connection plate 230, and second connection plate 240, and arc chute plate 100 is disposed in mounting housing 200; the first plate 210 and the second plate 220 are provided with a plurality of through grooves 250; in this embodiment, the mounting case 200 is used to fix the arc chute 100.

The two heat dissipation plates 300 are oppositely arranged and respectively close to the first plate 210 and the second plate 220, and the heat dissipation plates 300 are provided with through grooves 310; the protrusion 110 can penetrate through the through groove 250 and extend to the through groove 310, when an arc occurs near the arc extinguishing device, a large amount of heat is generated, the heat is transferred to the arc extinguishing grids 100 and is transferred to the heat dissipation plate 300 by the protrusion 110, and the heat dissipation plate 300 is in contact with the outside air, so that the heat transfer of the internal arc is accelerated.

The plurality of heat dissipation strips 400 are arranged between the adjacent arc extinguishing grids 100, two ends of each heat dissipation strip 400 can penetrate through the through grooves 250, heat can be further transferred to the heat dissipation plate 300 through the heat dissipation strips 400, and heat transfer is further accelerated; under the dual radiating effect through lug 110 and heat dissipation strip 400, effectively promote the radiating efficiency of circuit breaker to promote the whole life of circuit breaker.

Referring to fig. 2, in the present embodiment, a through hole 410 is formed on the heat dissipation strip 400, and the through hole 410 is in a long strip shape. Through the through holes 410, air between the arc-extinguishing grids 100 can circulate through the through holes 410, and meanwhile, the contact area between the heat dissipation strip 400 and the air can be increased, and the heat dissipation efficiency is further improved; further, in order to effectively improve the heat dissipation efficiency, the cross-sectional area of the through hole 410 can be enlarged as much as possible, in this embodiment, the through hole 410 extends along the length direction of the heat dissipation strip 400 to form a strip-shaped hole, so that the cross-sectional area of the through hole 410 can be effectively improved, and the heat dissipation effect is improved.

As preferred, the both ends of heat dissipation strip 400 are equipped with spliced pole 420, and spliced pole 420 can run through logical groove 250, sets up spliced pole 420 through both ends, and spliced pole 420 inserts the inner wall that leads to groove 250, not only can realize thermal effective transmission, also can further be convenient for spliced pole 420's installation simultaneously.

Preferably, the connection post 420 is integrally formed with the heat dissipation strip 400.

Optionally, one side of heat dissipation plate 300 close to installation housing 200 is provided with connection groove 320, and connection column 420 can extend to inside connection groove 320, and extend to inside connection groove 320 through connection column 420, so that it is ensured that heat of heat dissipation strip 400 is effectively transferred through heat dissipation plate 300, and the heat dissipation effect is improved.

Optionally, one side of the heat dissipation plate 300, which is far away from the installation housing 200, is provided with a clamping strip 330, the clamping strip 330 extends along the width direction of the heat dissipation plate 300, the clamping strip 330 can be matched with a positioning groove of the circuit breaker housing to fix the heat dissipation plate 300, preferably, the clamping strip 330 is located at a non-middle position of the heat dissipation plate 300, when an operator assembles the device into a circuit breaker, once the installation is reversed, the clamping strip 330 cannot be matched with the positioning groove of the circuit breaker housing, so that the effect of preventing the installation from being reversed is achieved.

Alternatively, the clip strip 330 is integrally formed with the heat sink 300.

Preferably, the arc chute 100 is formed with a V-shaped groove 120, and the V-shaped groove 120 extends from the top end to the bottom end of the arc chute 100. When the circuit breaker is in an arc state, the arc can extend to the bottom of the arc-extinguishing grid 100 along the groove wall of the V-shaped groove 120, so that the arc can be more intensively distributed among the arc-extinguishing grid 100, and other elements in the circuit breaker cannot be ablated.

In this embodiment, the heat dissipation plate 300 and the heat dissipation strip 400 are made of rubber, and specifically, the material may be heat conductive and insulating elastic rubber, which has a good heat conductive effect and is also insulating.

Another aspect of the present embodiment relates to a circuit breaker, please refer to fig. 5-7, the circuit breaker includes an upper housing 1, a mounting base 2, and the arc extinguishing device, the arc extinguishing device is fixed in the upper housing 1, and the mounting base 2 can be fastened to the upper housing 1, so that the arc extinguishing device is accommodated in the circuit breaker. Specifically, the arc extinguishing device is installed at a preset position of the upper case 1, and is used for arc extinguishing when an arc occurs in the circuit breaker.

Optionally, a plurality of first heat dissipation holes 10 are formed in the upper housing 1 at positions corresponding to the arc extinguishing device, a plurality of second heat dissipation holes 20 are formed in the mounting base 2 at positions corresponding to the arc extinguishing device, and the first heat dissipation holes 10 and the second heat dissipation holes 20 are used for heat dissipation of the arc extinguishing device. When the inside electric arc that appears of circuit breaker, near arc control device temperature is higher, can effectively realize the circulation of air through first louvre 10 and second louvre 20, makes the inside high temperature air of circuit breaker flow rapidly, realizes inside the circuit breaker rapidly, especially makes arc control device's cooling.

Optionally, a first positioning groove 14 is formed in the upper housing 1, a second positioning groove 21 is formed in the mounting base 2, and the two heat dissipation plates 300 can be respectively clamped into the first positioning groove 11 and the second positioning groove 21, so that the arc extinguishing device is positioned. By respectively arranging the first positioning groove 14 and the second positioning groove 21 on the upper shell 1 and the mounting base 2, when the upper shell 1 and the mounting base 2 are mutually buckled, the arc extinguishing device can be accurately positioned in the breaker, and meanwhile, the fixation of the arc extinguishing device can be further realized, so that the displacement of the arc extinguishing device caused by the vibration environment of the breaker is avoided; preferably, the arc extinguishing device is fixed by the clamping strips 330 of the two heat dissipation plates 300 being clamped into the first positioning groove 11 and the second positioning groove 21, respectively.

Referring to fig. 5, in the present embodiment, an insulating plate 11 and a limiting plate 12 are further disposed on an inner wall surface of the upper housing 1, a placing groove 13 is formed between the insulating plate 11 and the limiting plate 12, the placing groove 13 is used for placing an arc extinguishing device, wherein the insulating plate 11 is used for isolating an arc and preventing the high-temperature arc from ablating the upper housing 1, and the limiting plate 12 is used for further limiting a position of the arc extinguishing device relative to the upper housing 1, so as to facilitate assembly of the arc extinguishing device.

In this embodiment, the circuit breaker further includes a wrench 3 and an energizing mechanism 4, the wrench 3 is used for manually switching the closed state and the open state of the circuit breaker, the energizing mechanism 4 includes an incoming line terminal 41, an outgoing line terminal 42, a conductive plate 43, a static contact 44, a movable contact 45 and a tripping unit 46, the above structures are the existing structures in the field of circuit breakers, and no excessive burdens are made here.

The working principle of the circuit breaker is as follows: the incoming line terminal 41 and the outgoing line terminal 42 are connected with an external electric wire, when the wrench 3 is in an open state, the moving contact 45 and the static contact 44 are closed, and current flows to the outgoing line terminal 42 through the incoming line terminal 41, the conductive plate 43, the static contact 44, the moving contact 45 and the tripping unit 46 in sequence; when the circuit is short-circuited, the tripping unit 46 controls the moving contact 45 to be separated from the static contact 44, the circuit is cut off, and the wrench 3 is turned off at the same time, because the moving contact 45 is separated from the static contact 44 instantaneously, the discharge gap gradually changes, electric arcs easily appear near the moving contact 45 and the static contact 44, at this time, the arc extinguishing device plays a role and performs arc extinguishing operation, a large amount of heat is generated, high-temperature air between the heat dissipation strip 400 and the arc extinguishing grid 100 contacts, a large amount of heat is absorbed, the heat is conducted to the heat dissipation plate 300 through the connecting column 420, meanwhile, the heat on the arc extinguishing grid 100 is transmitted to the heat dissipation plate 300 through the bump 110, the heat dissipation plate 300 contacts with the outside air through the first heat dissipation hole 10 and the second heat dissipation hole 20, and therefore the heat dissipation effect is achieved.

The assembling process of the arc extinguishing device comprises the following steps: insert logical groove 250 with spliced pole 420 at first, after the completion, connect the outer wall at installation shell 200 with heating panel 300, lug 110 gets into and runs through groove 310, spliced pole 511 gets into the inner wall of spread groove 320 and closely laminates, place arc control device after the completion and get into standing groove 13, heating panel 300 gets into standing groove 13 along with arc control device, two card strips 330 get into first constant head tank 14 and second constant head tank 21 respectively, because card strip 330 is located the non-intermediate position of heating panel 300, when operating personnel is with arc control device assembly direction dress reversal, card strip 330 can't get into first constant head tank 14 and second constant head tank 21, thereby make the unable installation of arc control device, reach the effect that prevents that the arc control device from adorning the contrary.

Example two

The present embodiment is basically the same as the first embodiment, except that the arc chute 100 is integrally formed with the mounting housing 200 as an insert, which can effectively reduce the assembly difficulty of the arc extinguishing device and improve the assembly efficiency of the circuit breaker.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. An arc extinguishing device for arc extinction of a circuit breaker, comprising:

the arc extinguishing grid plates (100) are arranged in parallel at intervals, and the left end and the right end of each arc extinguishing grid plate (100) are provided with convex blocks (110);

a mounting housing (200), wherein the mounting housing (200) comprises a first plate (210), a second plate (220) arranged opposite to the first plate (210), a first connecting plate (230) and a second connecting plate (240) arranged opposite to the first connecting plate (230), the mounting housing (200) is formed by the first plate (210), the second plate (220), the first connecting plate (230) and the second connecting plate (240) in an enclosing manner, and the arc-extinguishing grid plate (100) is arranged in the mounting housing (200); the first plate (210) and the second plate (220) are provided with a plurality of through grooves (250);

the two heat dissipation plates (300) are oppositely arranged and respectively close to the first plate (210) and the second plate (220), and through grooves (310) are formed in the heat dissipation plates (300);

the heat dissipation strips (400), the heat dissipation strips (400) are arranged between the adjacent arc extinguishing grid plates (100);

the lug (110) can penetrate through the through groove (250) and extend into the through groove (310); two ends of the heat dissipation strip (400) can penetrate through the through groove (250).

2. The arc-extinguishing device according to claim 1, characterized in that the heat-dissipating strip (400) is provided with a through hole (410), and the through hole (410) is in the shape of a long strip.

3. An arc extinguishing device according to claim 1, characterized in that the heat dissipating bar (400) is provided with connecting studs (420) at both ends, the connecting studs (420) being capable of penetrating the through slots (250).

4. An arc extinguishing apparatus according to claim 3, wherein a side of the heat radiating plate (300) adjacent to the mounting case (200) is provided with a coupling groove (320), and the coupling post (420) can extend to the inside of the coupling groove (320).

5. The arc extinguishing apparatus according to claim 1, wherein a side of the heat dissipating plate (300) away from the mounting case (200) is provided with a locking bar (330), the locking bar (330) extends along a width direction of the heat dissipating plate (300), and the locking bar (330) can be engaged with a positioning groove of a circuit breaker housing to fix the heat dissipating plate (300).

6. The arc extinguishing device according to claim 1, wherein the arc chute (100) is provided with a V-shaped groove (120), and the V-shaped groove (120) extends from the top end to the bottom end of the arc chute (100).

7. The arc extinguishing device according to any of claims 1-6, characterized in that the material of the heat dissipating plate (300) and the heat dissipating strip (400) is rubber.

8. A circuit breaker comprising an upper case (1) and a mounting base (2), characterized in that it further comprises an arc extinguishing device according to any one of claims 1 to 7, said arc extinguishing device being fixed inside said upper case (1), said mounting base (2) being able to be fastened to said upper case (1) so that said arc extinguishing device is housed inside said circuit breaker.

9. The circuit breaker according to claim 8, wherein a plurality of first heat dissipation holes (10) are formed on the upper housing (1) at positions corresponding to the arc extinguishing device, a plurality of second heat dissipation holes (20) are formed on the mounting base (2) at positions corresponding to the arc extinguishing device, and the first heat dissipation holes (10) and the second heat dissipation holes (20) are used for heat dissipation of the arc extinguishing device.

10. The circuit breaker according to claim 8, wherein a first positioning groove (14) is formed on the upper housing (1), a second positioning groove (21) is formed on the mounting base (2), and the two heat dissipation plates (300) can be respectively clamped into the first positioning groove (11) and the second positioning groove (21) to position the arc extinguishing device.

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