CN211828647U

CN211828647U - Circuit breaker

Info

Publication number: CN211828647U
Application number: CN201820315852.3U
Authority: CN
Inventors: 黄东林; 夏晓敏; 叶晨晖
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2018-03-07
Filing date: 2018-03-07
Publication date: 2020-10-30
Anticipated expiration: 2028-03-07

Abstract

A circuit breaker comprises a shell, a contact assembly and an arc extinguish chamber, wherein the contact assembly and the arc extinguish chamber are arranged in the shell; and one side of the arc inlet of the arc extinguish chamber is provided with an arc suction device for preventing arc airflow in the arc extinguish chamber from reversely spraying to the contact assembly. The utility model discloses a circuit breaker sets up in income arc mouth one side of explosion chamber and inhales the arc device, and on the one hand, it can block partly high thermal arc air current to inhale the arc device, and on the other hand inhales the arc device and cools down to the absorption of hot gas flow to reduce contact area temperature, prevent that the electric arc air current in the explosion chamber from spouting backward to the contact subassembly, restrain and shift the phenomenon behind one's back, simple structure is compact, performance safety and stability.

Description

Circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus field, in particular to circuit breaker.

Background

In the existing circuit breaker, once the contacts are separated after the circuit is broken, namely the moving contact is separated from the static contact, an electric arc is formed between the moving contact and the static contact, then the electric arc moves to an arc extinguish chamber from a contact area and is divided into a plurality of short arcs in the arc extinguish chamber, the short arcs are mutually superposed, the electric arc voltage is rapidly increased to form a new electric arc and is transferred to the contact area, hot air generated by the electric arc is easily reflected back to the contact area from the arc extinguish chamber to generate a back transfer phenomenon, and the phenomenon repeatedly occurs, so that the arcing time of the whole breaking process of the circuit breaker is prolonged, the breaking performance of the circuit breaker is influenced, the contacts of the circuit breaker are corroded, and the reliability of the circuit breaker is reduced.

The product of current circuit breaker does not have explosion chamber location structure, along with the popularization of automatic installation line, has improved the circuit breaker product to the location requirement of each part to after the installation error appears, the performance of circuit breaker reduces.

Disclosure of Invention

An object of the utility model is to overcome prior art's defect, provide a simple structure is compact, performance safety and stability's circuit breaker.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a circuit breaker comprises a shell, a contact assembly and an arc extinguish chamber 2, wherein the contact assembly and the arc extinguish chamber are arranged in the shell, and one side of an arc inlet c of the arc extinguish chamber 2 faces the contact assembly; and an arc suction device 3 for preventing arc airflow in the arc extinguishing chamber 2 from being reversely sprayed to the contact assembly is arranged on one side of an arc inlet c of the arc extinguishing chamber 2.

Furthermore, the contact assembly and the arc extinguishing chamber 2 are arranged in the base 1 of the shell, the arc extinguishing chamber further comprises a handle 5 arranged at the top of one side of the base 1, an operating mechanism 6 connected with the handle 5 and extending to the other side of the base 1, an electromagnetic coil 4 positioned below the handle 5, and connecting terminals and arc striking plates 8 arranged at two sides of the base 1, the arc extinguishing chamber 2 is positioned below the electromagnetic coil 4, one end of each arc striking plate 8 is close to the contact assembly, and the other end of each arc striking plate extends to the lower side of the arc extinguishing chamber 2; the contact assembly comprises a fixed contact 14 fixedly installed in the base 1 and a movable contact 13 arranged opposite to the fixed contact 14, one end of the fixed contact 14 is connected to the lower portion of the electromagnetic coil 4, one end of the movable contact 13 is connected with a contact support of the operating mechanism 6, a contact at the other end of the movable contact 13 is arranged opposite to a contact of the fixed contact 14, and the operating mechanism 6 acts to drive the contacts of the movable contact 13 and the fixed contact 14 to be contacted and separated so as to switch on and switch off a circuit.

Further, the arc suction device 3 comprises a front partition plate 31 and a rear partition plate 32, the front partition plate 31 is arranged on one side close to the arc extinguishing chamber 2, the rear partition plate 32 is arranged on one side close to the contact assembly, and the top of the arc suction device 3 is positioned below an arc inlet c of the arc extinguishing chamber 2.

Further, the casing includes base 1 and the apron of lock on base 1, inhales arc device 3 and locates on base 1, and the income nock c of explosion chamber 2 is the V type, and the opening one end that the nock c was gone into to the V type is towards the contact subassembly, and explosion chamber 2 forms straight reason on the one side of contact subassembly in proper order, V-arrangement breach section and straight lower edge, inhales arc device 3's top and is located the minimum below of V-arrangement breach section.

Further, an arc absorbing device 3 is arranged on the cover plate, and the bottom of the arc absorbing device 3 on the cover plate extends to the highest point of the V-shaped gap section.

Further, the arc absorbing device 3 further includes a rib 33 disposed between the front partition plate 31 and the rear partition plate 32, and the front partition plate 31, the rear partition plate 32 and the rib 33 together define an air gap channel 301 for the arc airflow to flow.

The moving contact 13 comprises a main contact and an auxiliary contact, the main contact and the main contact are separated from each other at two sides of the interlayer plate 7, the main contact and the main contact are arranged above the interlayer plate 7, and the auxiliary moving contact and the auxiliary contact are arranged below the interlayer plate 7; the front partition plate 31 and the rear partition plate 32 are arranged in parallel, the height of the front partition plate 31 is higher than that of the rear partition plate 32, the division plate 7 extends from the top of the rear partition plate 32 to the contact assembly, and the bottom of the division plate 7 is flush with the bottom of the front partition plate 31.

Further, the convex rib 33 is convexly arranged on the side wall of the front partition plate 31 facing the rear partition plate 32, the bottom of the convex rib 33 extends to the bottom of the base 1, and the top of the convex rib 33 is flush with the top of the rear partition plate 32; the convex rib 33 is convexly arranged in the middle of the side wall of the front partition plate 31 facing the rear partition plate 32, and the base 1 is convexly provided with a cross bar 103 for lengthening the flow path of the arc airflow under the convex rib 33.

Further, the front baffle 31 is provided with a limiting protrusion 311 for limiting the arc extinguish chamber 2 towards the side wall of the arc entrance c of the arc extinguish chamber 2, and the limiting protrusion 311 extends to the arc extinguish grid piece 212 of the arc extinguish chamber 2 to limit the arc extinguish chamber 2.

Further, the protruding spacing baffle 111 that is used for separating solenoid 4 and explosion chamber 2 that is equipped with between explosion chamber 2 and the solenoid 4 in the base 1, base 1 be equipped with in the play arc mouth one side of explosion chamber 2 with the spacing projection 112 of one side of explosion chamber 2, the opposite side of explosion chamber 2 is spacing by inhaling arc device 3, the upper end of explosion chamber 2 is spacing by spacing baffle 111, the lower extreme of explosion chamber 2 is spacing by the bottom curb plate of base 1.

The utility model discloses a circuit breaker sets up in income arc mouth one side of explosion chamber and inhales the arc device, and on the one hand, it can block partly high thermal arc air current to inhale the arc device, and on the other hand inhales the arc device and cools down to the absorption of hot gas flow to reduce contact area temperature, prevent that the electric arc air current in the explosion chamber from spouting backward to the contact subassembly, restrain and shift the phenomenon behind one's back, simple structure is compact, performance safety and stability. The utility model discloses a driving head and auxiliary contact are separated in the both sides of interlayer board, and the interlayer board plays fine electrical isolation effect. When the moving contact and the static contact are closed, main electric arc is generated by the main contact, and the electric arc generated by the closing of the auxiliary contact is extinguished in a relatively sealed space below the interlayer plate. A gap for absorbing arc airflow is formed between the front partition plate and the rear partition plate, the arc airflow is cooled by flowing through the gap of the arc absorbing device, hot airflow is directly ejected backwards out of the arc absorbing device after being cooled by flowing through the gap, and a certain gas barrier is formed above the arc absorbing device, so that the hot airflow of the arc extinguishing chamber is prevented from running towards a contact area to a certain extent, and the phenomenon of back transfer is inhibited. The convex ribs are arranged to lengthen the path of the high-heat gas flowing through the gap, and the cooling effect is enhanced.

Drawings

Fig. 1 is an internal structural view of the circuit breaker of the present invention;

FIG. 2 is a perspective view of the base of the present invention;

FIG. 3 is a partial view of the arc suction device of the present invention;

fig. 4 is another internal structure diagram of the circuit breaker of the present invention;

FIG. 5 is a view showing the structure of the first embodiment of the arc suction device of the present invention;

FIG. 6 is a view showing the structure of a second embodiment of the arc suction device of the present invention;

fig. 7 is an internal structural view of another embodiment of the circuit breaker of the present invention;

fig. 8 is a diagram of a base structure of another embodiment of the circuit breaker of the present invention;

figure 9 is a base structure diagram of another embodiment of the circuit breaker of the present invention;

fig. 10 is a perspective view of another embodiment of the arc chute of the present invention.

Detailed Description

The following describes the circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 10. The circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1-2, the circuit breaker of the present invention comprises a housing, the housing comprises a base 1, a cover plate fastened to the base, a contact assembly installed in the base 1, and an arc extinguishing chamber 2, wherein one side of an arc inlet c of the arc extinguishing chamber 2 faces the contact assembly; still including installing in the handle 5 of base 1 one side top, be connected with handle 5 and stretch to the operating device 6 of base 1 opposite side, be located the solenoid 4 of handle 5 below, locate binding post and the arc piece 8 of base 1 both sides, explosion chamber 2 is located the below of solenoid 4, and the one end of arc piece 8 is close to contact assembly, and the other end stretches to the below of explosion chamber 2. The utility model discloses circuit breaker simple structure is compact, performance safety and stability.

As shown in fig. 1, the contact assembly includes a fixed contact 14 fixedly installed in the base 1 and a movable contact 13 arranged opposite to the fixed contact 14, one end of the fixed contact 14 is connected below the electromagnetic coil 4, one end of the movable contact 13 is connected with a contact support of the operating mechanism 6, a contact at the other end of the movable contact 13 is arranged opposite to a contact of the fixed contact 14, and the operating mechanism 6 acts to drive the contacts of the movable contact 13 and the fixed contact 14 to contact and separate to turn on and off the circuit.

As shown in fig. 1, the contact assembly of the present invention is a dual contact, including a set of main contacts and a set of auxiliary contacts. The magnetic separation type magnetic separation device is characterized by further comprising a interlayer plate 7 arranged in the base 1, the moving contact 13 comprises a driving contact and an auxiliary moving contact, the static contact 14 comprises a main static contact and an auxiliary static contact, the driving contact and the main static contact and the auxiliary moving contact and the auxiliary static contact are separated from two sides of the interlayer plate 7, the driving contact and the main static contact are arranged above the interlayer plate 7, and the auxiliary moving contact and the auxiliary static contact are arranged below the interlayer plate 7. The utility model discloses a driving head and auxiliary contact are separated in the both sides of interlayer board 7, and interlayer board 7 plays fine electrical isolation effect. When the moving contact 13 and the static contact 14 are closed, the main electric arc is generated by the main contact, and the electric arc generated by the closing of the auxiliary contact is extinguished in the relatively sealed space below the interlayer plate 7.

As shown in fig. 1 to 3, an arc suction device 3 for preventing the arc gas flow in the arc extinguishing chamber 2 from being reversely sprayed toward the contact assembly is provided at one side of the arc inlet c of the arc extinguishing chamber 2. The utility model discloses a circuit breaker sets up in income arc mouth one side of explosion chamber and inhales the arc device, and on the one hand, it can block partly high thermal arc air current to inhale the arc device, and on the other hand inhales the arc device and cools down to the absorption of hot gas flow to reduce contact area temperature, prevent that the electric arc air current in the explosion chamber from spouting backward to the contact subassembly, restrain and shift the phenomenon behind one's back, simple structure is compact, performance safety and stability.

As shown in fig. 1-4, the arc suction device 3 is a front partition plate 31 and a rear partition plate 32 which are arranged on the base 1, the front partition plate 31 is arranged on one side close to the arc extinguish chamber 2, the rear partition plate 32 is arranged on one side close to the contact assembly, an arc inlet c of the arc extinguish chamber 2 is a V-shaped, one end of an opening of the arc inlet c faces towards the contact assembly, the arc extinguish chamber 2 sequentially forms a straight upper edge, a V-shaped gap section and a straight lower edge towards one side of the contact assembly, and the top of the arc suction device 3 is located below the lowest point of the V-shaped gap section. In particular, the arc suction device 3 can also be arranged on the arc extinguishing chamber 2. Specifically, the top of the arc suction device 3 is located below the V-shaped notch section of the arc extinguish chamber 2, so that an electric arc generated by the main contact can smoothly enter the arc extinguish chamber, a gap for absorbing an electric arc airflow is formed between the front partition plate 31 and the rear partition plate 32, the electric arc airflow is cooled when flowing through the gap of the arc suction device 3, a hot airflow directly bounces back out of the arc suction device after being cooled when flowing through the gap, a certain gas barrier is formed above the arc suction device, and therefore the phenomenon that the hot airflow of the arc extinguish chamber runs towards a contact area and is transferred behind the back is inhibited. Of course, the arc suction device 3 may also be arranged on the cover plate, with the bottom of the arc suction device 3 extending at the highest point of the V-shaped notch section.

As shown in fig. 3-4, the arc absorbing device 3 further includes a rib 33 disposed between the front partition plate 31 and the rear partition plate 32, and the front partition plate 31, the rear partition plate 32 and the rib 33 together define an air gap channel 301 for flowing the arc air flow. The convex ribs 33 are arranged to lengthen the path of the high-heat gas flowing through the gap, and the cooling effect is enhanced.

As shown in fig. 2-4, the front and

rear spacers

31, 32 are arranged in parallel, the height of the front spacer 31 is greater than the height of the rear spacer 32, the spacer plate 7 extends from the top of the rear spacer 32 towards the contact assembly, and the bottom of the spacer plate 7 is flush with the bottom of the front spacer 31. Through designing out certain difference in height with two baffles, preceding baffle 31 highly be higher than the height of back baffle 32, and division board 7 locates the top of back baffle 32 and extends the setting to contact assembly one side, the structural design of the bottom of division board and the bottom parallel and level of preceding baffle for the electric arc that the main contact closure produced can get into the explosion chamber smoothly and carry out the arc extinguishing. In addition, similar structural improvement is that a fixing convex column 102 for fixing the main static contact is arranged below the main static contact of the base 1, and the top of the fixing convex column 102 is flush with the top of the rear partition plate 32; fixed convex column 102 is used for installing fixedly main static contact, and this embodiment adopts the screw installation, and the structure is firm reliable, and the top of fixed convex column 102 also can get into the explosion chamber smoothly for the electric arc that main contact closed production the arc extinguishing.

As shown in fig. 5, a first embodiment of the bead is shown. The protruding of protruding muscle 33 is located preceding baffle 31 towards the lateral wall of back baffle 32, and the bottom of protruding muscle 33 extends to the bottom of base 1, and the top of protruding muscle 33 is parallel and level with the top of back baffle 32. Protruding muscle 33 is trapezoidal protruding muscle, also can establish to the protruding muscle of cuboid, and trapezoidal protruding muscle can lengthen the route of flowing through of high hot gas more, increases the cooling effect.

As shown in fig. 6, the rib 33 is convexly provided at the middle of the sidewall of the front partition 31 facing the rear partition 32, and the base 1 is convexly provided with a cross bar 103 for lengthening the flow path of the arc gas flow right below the rib 33. The convex rib 33 is arranged in the middle of the front clapboard 31, and the transverse bar 103 is arranged right below the convex rib 33, so as to increase the flow path of hot air flow and achieve better cooling effect.

It is also conceivable that the rib 33 may be formed integrally with the front bulkhead 31, may be formed integrally with the rear bulkhead 32, or may be formed integrally with the rib 33, the front bulkhead 31, and the rear bulkhead 32. The rear partition 32 may also be formed separately and integrally with the partition plate 7.

As shown in fig. 2 and 3, a limiting protrusion 311 for limiting the arc extinguishing chamber 2 is provided on the side wall of the front partition plate 31 facing the arc inlet c of the arc extinguishing chamber 2 in a protruding manner, and the limiting protrusion 311 extends to between the arc extinguishing grid pieces 212 of the arc extinguishing chamber 2 to limit the arc extinguishing chamber 2. Spacing arch 311 stretches to and carries on spacingly to the explosion chamber between the arc extinguishing bars piece 212, plays the positioning action to explosion chamber 2 simultaneously, prevents that explosion chamber 2 from reciprocating.

As shown in fig. 2, the base 1 is provided with a limiting partition plate 111 for separating the electromagnetic coil 4 and the arc extinguish chamber 2 between the arc extinguish chamber 2 and the electromagnetic coil 4 in a protruding manner, the base 1 is provided with a limiting convex column 112 which is limited by one side of the arc extinguish chamber 2 on one side of an arc outlet of the arc extinguish chamber 2, the other side of the arc extinguish chamber 2 is limited by the arc absorbing device 3, the upper end of the arc extinguish chamber 2 is limited by the limiting partition plate 111, and the lower end of the arc extinguish chamber 2 is limited by a bottom side plate. The upper end and the lower end of the arc extinguish chamber 2 are limited by the limiting partition board 111 and the bottom side board of the base 1, the left side and the right side of the arc extinguish chamber 2 are limited by the limiting convex columns 112 and the arc suction devices 3, the periphery of the arc extinguish chamber 2 is limited by the limiting structures, and the installation structure of the arc extinguish chamber is stable and reliable.

As shown in fig. 7-10, the arc extinguish chamber 2 is provided with a first positioning groove and/or a first positioning protrusion for preventing the arc extinguish chamber 2 from being reversely mounted, and the shell is provided with a first positioning protrusion and/or a second positioning groove which are matched with the first positioning groove and/or the first positioning protrusion in a positioning manner. The utility model discloses be equipped with the first positioning groove andor the first positioning arch that prevents the explosion chamber from turning over the dress on the explosion chamber, be equipped with on the base with first positioning groove andor the protruding location complex first positioning arch andor the second positioning groove of first positioning, first positioning groove andor first positioning arch and first positioning arch andor second positioning groove location fit avoid the explosion chamber to appear turning over the dress, guarantee product arc extinguishing performance.

As shown in fig. 7, a plurality of arc ignition plates 17 are arranged at the bottom of the base 1 in a protruding manner on one side of an arc inlet c of the arc extinguish chamber 2, an arc ignition channel 171 is formed between two adjacent arc ignition plates 17, the end of the arc ignition channel 171 extends to one side of the arc inlet c of the arc extinguish chamber 2, at least one exhaust plate 18 is arranged on one side of the arc outlet of the arc extinguish chamber 2, and the exhaust plate 18 divides the area on one side of the arc outlet of the arc extinguish chamber 2 into a plurality of exhaust channels 181. The arc striking channel 171 separates the arc and then evenly enters the arc extinguishing chamber 2, and the exhaust channel 181 enables the high-heat gas generated after the arc extinguishing chamber 2 is extinguished after the arc is extinguished to be smoothly exhausted out of the shell, so as to prevent the high-heat gas from being sprayed to other internal elements of the circuit breaker.

Specifically, as shown in fig. 10, the structure of the arc extinguishing chamber 2 of the present invention. Arc extinguishing chamber 2 includes two arc extinguishing curb plates 211 and installs the polylith arc extinguishing bars piece 212 between two arc extinguishing curb plates 211, and arc outlet one side of arc extinguishing chamber 2 is equipped with arc extinguishing bottom plate 215, is equipped with the exhaust hole 2150 that the multirow staggered arrangement set up on arc extinguishing bottom plate 215, and arc extinguishing curb plate 211 is parallel with base 1's bottom surface. Through staggering the exhaust hole site in order to maintain less exhaust flux, satisfy the required gas pressure of arc extinguishing, prevent that electric arc gas is compound to can filter the metal particle that produces when sound contact is separately, simple structure, simple to operate, economical and practical just can make the explosion chamber guarantee to have certain pressure after electric arc produces, can improve arc extinguishing speed and can also prevent electric arc from puncturing behind one's back simultaneously, thereby prolong the life of circuit breaker. The structure of the arc extinguishing chamber 2 is simple and compact.

A first embodiment of the positioning structure is shown in fig. 7-9. The arc extinguish chamber 2 is provided with a first positioning groove for preventing the arc extinguish chamber 2 from being reversely mounted, and the base 1 is provided with a first positioning bulge matched with the first positioning groove in a positioning way; first positioning groove is positioning groove 213 that sets up on the arc extinguishing curb plate 211 that arc extinguishing chamber 2 is close to base 1's bottom surface one side, and first location arch sets up and positioning groove 213 location complex's location projection 15 for base 1's bottom protrusion. The positioning convex column 15 is a plate-shaped structure which is convexly arranged on the base 1, and the positioning groove 213 is a strip-shaped groove matched with the positioning convex column 15; the positioning convex column 15 should be arranged at the position of the arc extinguishing side plate 211 deviating from the center, and the positioning structure of the positioning convex column 15 and the positioning groove 213 is stable and reliable.

A second embodiment of the positioning structure is shown in fig. 7-9. The arc extinguish chamber 2 is provided with a first positioning groove for preventing the arc extinguish chamber 2 from being reversely mounted, and the base 1 is provided with a first positioning bulge matched with the first positioning groove in a positioning way; two arc extinguishing curb plates 211 of explosion chamber 2 stretch out the arc extinguishing bars piece 212 in the outside, and first positioning groove is two arc extinguishing curb plates 211 towards the breach groove 214 that forms between one side tip of going into arc mouth c and two arc extinguishing bars pieces 212 in the outside, and first locating protrusion is base 1's bottom protrusion setting and two locating pieces 16 of both sides breach groove 214 location fit. The end parts of the two arc extinguishing side plates 211 and the notch grooves 214 formed by the two outermost arc extinguishing grid pieces 212 are matched with the positioning blocks 16 at the corresponding positions of the base in a positioning manner, so that the positioning structure is stable and reliable.

A third embodiment of the positioning structure is shown in fig. 7-9. The arc extinguish chamber 2 is provided with a first positioning groove for preventing the arc extinguish chamber 2 from being reversely mounted, and the base 1 is provided with a first positioning bulge matched with the first positioning groove in a positioning way; first positioning groove includes that breach groove 214 and the arc extinguishing curb plate 211 that arc extinguishing chamber 2 formed between two arc extinguishing bars piece 212 of one side tip and the outside of two arc extinguishing curb plate 211 orientation income arc mouth c set up on being close to the positioning groove 213 that sets up on the arc extinguishing curb plate 211 of base 1's bottom one side, and first positioning is protruding to set up including base 1's bottom protrusion and two locating pieces 16 of both sides breach groove 214 location fit and base 1's bottom protrusion setting and positioning groove 213 location fit's location projection 15. I.e. the positioning structures of the first embodiment described above may be present simultaneously. Obviously, a positioning groove and/or a positioning convex column can be arranged on the cover plate to be matched with the positioning convex column or the positioning groove on the arc extinguish chamber to play a role in preventing reverse installation.

As shown in fig. 7, the distance between the two positioning blocks 16 is slightly greater than or equal to the total width of all arc chute plates 212 of the arc chute 2. Preferably, the distance between the two positioning blocks 16 is equal to the total width of all arc chute plates 212 of the arc chute 2. Notch groove 214 and locating piece 16 play the effect of explosion chamber anti-reverse installation on the one hand, play the spacing effect on the other hand.

As shown in fig. 8, another embodiment of the arc chute limiting structure is given. Base 1 protrusion between the electromagnetic system of explosion chamber 2 and circuit breaker is equipped with limiting baffle 111, and limiting baffle 111 is perpendicular with base 1's bottom surface, and limiting baffle 111 is equipped with the first limiting lug 111a of the spacing complex in upper end with explosion chamber 2 towards the lateral wall protrusion of explosion chamber 2, base 1's bottom inside wall protrusion be equipped with the spacing complex second limiting lug 111b of the lower extreme of explosion chamber 2, first limiting lug 111a and the spacing lug 111b of second are located arc outlet one side of explosion chamber 2. First spacing lug 111a and the spacing lug 111b of second carry on spacingly to explosion chamber 2 from upper and lower both ends, and above-mentioned location structure can play carries out spacing effect to explosion chamber 2 about. Other limiting structures may also be employed.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. A circuit breaker, characterized by: the arc extinguishing device comprises a shell, a contact assembly and an arc extinguishing chamber (2), wherein the contact assembly and the arc extinguishing chamber (2) are arranged in the shell, and one side of an arc inlet (c) of the arc extinguishing chamber (2) faces to the contact assembly; one side of the arc inlet (c) of the arc extinguish chamber (2) is provided with an arc suction device (3) which is used for preventing the arc airflow in the arc extinguish chamber (2) from being reversely sprayed to the contact assembly and comprises a partition plate.

2. The circuit breaker of claim 1, wherein: the contact assembly and the arc extinguishing chamber (2) are arranged in a base (1) of the shell, the contact assembly and the arc extinguishing chamber further comprise a handle (5) arranged at the top of one side of the base (1), an operating mechanism (6) connected with the handle (5) and extending to the other side of the base (1), an electromagnetic coil (4) positioned below the handle (5), and a wiring terminal and an arc striking sheet (8) which are arranged at two sides of the base (1), the arc extinguishing chamber (2) is positioned below the electromagnetic coil (4), one end of the arc striking sheet (8) is close to the contact assembly, and the other end of the arc striking sheet extends to the lower part of the; the contact assembly comprises a fixed contact (14) fixedly installed in the base (1) and a movable contact (13) arranged opposite to the fixed contact (14), one end of the fixed contact (14) is connected to the lower portion of the electromagnetic coil (4), one end of the movable contact (13) is connected with a contact support of the operating mechanism (6), a contact at the other end of the movable contact (13) is arranged opposite to a contact of the fixed contact (14), and the operating mechanism (6) acts to drive the contacts of the movable contact (13) and the fixed contact (14) to be contacted and separated to switch on and off a circuit.

3. The circuit breaker according to claim 1 or 2, characterized in that: inhale arc device (3) and include preceding baffle (31) and back baffle (32), one side that is close to explosion chamber (2) is located in preceding baffle (31), and one side that is close to contact subassembly is located in back baffle (32), inhales the below that the top of arc device (3) is located the income nock (c) of explosion chamber (2).

4. The circuit breaker according to claim 1 or 2, characterized in that: the casing includes base (1) and the apron of lock on base (1), inhales arc device (3) and locates on base (1), and the income nock (c) of explosion chamber (2) are the V type, and the opening one end that the nock (c) was gone into to the V type is towards contact element, and explosion chamber (2) form straight reason on one side of contact element in proper order, V-arrangement breach section and straight lower edge, and the top of inhaling arc device (3) is located the minimum below of V-arrangement breach section.

5. The circuit breaker of claim 4, wherein: the cover plate is also provided with an arc absorbing device (3), and the bottom of the arc absorbing device (3) on the cover plate extends to the highest point of the V-shaped gap section.

6. The circuit breaker of claim 3, wherein: the arc absorbing device (3) further comprises a convex rib (33) arranged between the front partition plate (31) and the rear partition plate (32), and the front partition plate (31), the rear partition plate (32) and the convex rib (33) jointly form an air gap channel (301) for the flowing of the arc airflow.

7. The circuit breaker of claim 6, wherein: the device is characterized by further comprising a interlayer plate (7) arranged in the base (1), the moving contact (13) comprises an active contact and an auxiliary moving contact, the static contact (14) comprises a main static contact and an auxiliary static contact, the active contact and the main static contact as well as the auxiliary moving contact and the auxiliary static contact are separated from two sides of the interlayer plate (7), the active contact and the main static contact are arranged above the interlayer plate (7), and the auxiliary moving contact and the auxiliary static contact are arranged below the interlayer plate (7); the front partition plate (31) and the rear partition plate (32) are arranged in parallel, the height of the front partition plate (31) is higher than that of the rear partition plate (32), the interlayer plate (7) extends from the top of the rear partition plate (32) to the contact assembly, and the bottom of the interlayer plate (7) is flush with the bottom of the front partition plate (31).

8. The circuit breaker of claim 7, wherein: the convex rib (33) is convexly arranged on the side wall of the front partition plate (31) facing the rear partition plate (32), the bottom of the convex rib (33) extends to the bottom of the base (1), and the top of the convex rib (33) is flush with the top of the rear partition plate (32); the convex rib (33) is arranged in the middle of the side wall of the front partition plate (31) facing the rear partition plate (32) in a protruding mode, and the transverse bar (103) for lengthening the arc airflow flow path is arranged under the convex rib (33) in the protruding mode of the base (1).

9. The circuit breaker of claim 7, wherein: preceding baffle (31) are equipped with spacing arch (311) that are used for spacing explosion chamber (2) towards going into arc mouth (c) one side lateral wall protrusion of explosion chamber (2), and spacing arch (311) stretch to spacing arc extinguishing chamber (2) between arc extinguishing bars piece (212) of explosion chamber (2) spacing.

10. The circuit breaker of claim 2, wherein: the arc extinguishing chamber is characterized in that a limiting partition plate (111) used for separating the electromagnetic coil (4) and the arc extinguishing chamber (2) is arranged between the arc extinguishing chamber (2) and the electromagnetic coil (4) in the base (1) in a protruding mode, a limiting convex column (112) limited to one side of the arc extinguishing chamber (2) is arranged on one side of an arc outlet of the arc extinguishing chamber (2) of the base (1), the other side of the arc extinguishing chamber (2) is limited by the arc suction device (3), the upper end of the arc extinguishing chamber (2) is limited by the limiting partition plate (111), and the lower end of the arc extinguishing chamber (2) is limited by a bottom.