CN211150479U - Moving contact and circuit breaker - Google Patents

Abstract

The utility model discloses a moving contact and circuit breaker relates to electric technical field. The moving contact comprises a support section, a contact section and an arc striking section; the supporting section is used for connecting an operating mechanism of the circuit breaker and is used for externally connecting a circuit; the contact section is respectively provided with a first end and a second end far away from the first end, the first end is connected with the support section, and the second end is provided with a contact part used for contacting with a fixed contact of the circuit breaker; the arc striking section is connected with the second end and forms a first included angle with the contact section. The utility model provides a very big degree of moving contact shorten the dwell time of electric arc, have longer life to can show the arc extinguishing speed that promotes the circuit breaker.

Description

Moving contact and circuit breaker

Technical Field

The utility model relates to an electrical technology field particularly, relates to a moving contact and circuit breaker.

Background

In the use process of a circuit breaker on the market, the moving contact and the fixed contact are separated from the contact to generate electric arc, the staying time of the electric arc on the moving contact is too long, the moving contact is easy to burn, and then a large amount of metal steam is generated to increase the energy of the electric arc, so that the electric arc is difficult to extinguish.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a moving contact, it can make electric arc break away from fast, promotes the arc extinguishing ability.

Another object of the utility model is to provide a circuit breaker, it can make electric arc break away from the moving contact fast, promotes the arc extinguishing ability.

The utility model provides a technical scheme:

a moving contact comprises a support section, a contact section and an arc striking section;

the supporting section is used for connecting an operating mechanism of the circuit breaker and externally connecting a circuit;

the contact section is respectively provided with a first end and a second end far away from the first end, the first end is connected with the support section, and the second end is provided with a contact part used for contacting with a fixed contact of the circuit breaker;

the arc striking section is connected with the second end and forms a first included angle with the contact section.

Further, the support section with the contact section is the second contained angle, the second contained angle is 10 ~ 55.

Furthermore, one side of the second end is provided with a contact surface, the contact surface is a plane, and the contact part protrudes out of the contact surface.

Further, an arc ignition surface is arranged on the arc ignition section, the arc ignition surface is arc-shaped, and the arc ignition surface is connected with the contact surface.

Further, support section and linkage segment that includes interconnect, the wiring section with the linkage segment is the third contained angle, the linkage segment is kept away from the one end of wiring section with first end is connected, the wiring section is kept away from the one end of linkage segment is used for external circuit, the wiring section with the junction of linkage segment be used for with the operating device of circuit breaker connects.

The utility model also provides a circuit breaker, including the static contact and the moving contact, the moving contact includes support section, contact section and striking section, the support section is used for connecting the operating device of the circuit breaker and is used for external circuit; the contact section is respectively provided with a first end and a second end far away from the first end, the first end is connected with the support section, and the second end is provided with a contact part used for contacting with a fixed contact of a circuit breaker; the arc ignition section is connected with the second end and forms a first included angle with the contact section; the supporting section is connected with an operating mechanism of the circuit breaker and used for driving the contact part to be in contact with or separated from the static contact under the action of the operating mechanism and move to a preset position.

Further, the circuit breaker still includes the explosion chamber, works as the contact site moves to when presetting the position, the contact segment with the contained angle between the static contact with the explosion chamber corresponds.

Further, in the process that the contact part is separated from the fixed contact and moves to the preset position, the extending direction of the contact section is always intersected with the arc extinguish chamber.

Further, in the process that the contact part is separated from the fixed contact and moves to the preset position, the extension direction of the arc striking section is always intersected with the arc extinguishing chamber.

Furthermore, the circuit breaker further comprises an arc striking assembly, the arc striking assembly is provided with an arc striking channel, the static contact is contained in the arc striking channel, the movable contact is inserted from one end of the arc striking channel, and the arc extinguishing chamber is arranged at the other end of the arc striking channel.

Further, the arc-quenching assembly comprises a first arc-isolating plate, a second arc-isolating plate, an insulating plate, a first arc-striking plate and a second arc-striking plate, wherein the first arc-isolating plate and the second arc-isolating plate are arranged on the insulating plate at intervals, the second arc-striking plate is arranged on the insulating plate, one end of the second arc-striking plate is inserted into the first arc-isolating plate and the second arc-isolating plate and is surrounded by the first arc-isolating plate and the second arc-isolating plate together to form the arc-quenching channel, the other end of the second arc-striking plate extends to one end of the arc-quenching chamber, and the first arc-striking plate is arranged at one end of the arc-quenching chamber far away from the second arc-striking plate.

Furthermore, one side of the first arc isolating plate, which is close to the second arc isolating plate, is provided with a supporting arm and a positioning rib in a protruding mode respectively, the end wall of the supporting arm is abutted to the second arc isolating plate, a gap exists between the second arc striking plate and the insulating plate, and the positioning rib is inserted into the gap.

Furthermore, one side of the first flash barrier, which is far away from the second flash barrier, is provided with a first mounting groove, one side of the second flash barrier, which is far away from the first flash barrier, is provided with a second mounting groove, and the first mounting groove and the second mounting groove are respectively embedded with a magnetism increasing sheet.

Furthermore, the circuit breaker further comprises a shell and an elastic piece, wherein two ends of the elastic piece are respectively connected with the supporting section and the shell, and the elastic piece is used for driving the moving contact to rotate so as to drive the contact part to move to the preset position.

Compared with the prior art, the utility model provides a moving contact is including supporting section, contact segment and arc-striking section, and the first end and the support section of contact segment are connected, and its second end is connected with the arc-striking section, and the contact segment is first contained angle with the arc-striking section, and the second end is provided with the contact site that is used for the static contact with the circuit breaker. In practical application of the moving contact configured in the circuit breaker, the contact part is contacted with the static contact in a normal working state, and when the instantaneous current is overlarge and the moving contact is separated from the static contact, the contact part generates electric arc. Because the second end at contact site is connected with the striking section to the striking section is first contained angle with the contact segment, consequently, under the effect of striking of the subassembly of striking the arc of circuit breaker, the arc breaks away from the explosion chamber that the moving contact got into the circuit breaker fast by the second end in the twinkling of an eye that the arc flows towards the striking section. Therefore, the electric arc stays on the moving contact for a very short time, and the moving contact cannot be burnt or burnt to a very small degree. Therefore, the utility model provides a beneficial effect of moving contact includes: the residence time of electric arc has been shortened to very big degree, has longer life to can show the arc extinguishing speed that promotes the circuit breaker.

Compared with the prior art, the utility model provides a circuit breaker, the moving contact of its configuration includes support section, contact segment and arc-striking section, and the first end and the support section of contact segment are connected, and its second end is connected with the arc-striking section, and the contact segment is first contained angle with the arc-striking section, and the second end is provided with the contact site that is used for contacting with the static contact of circuit breaker. When the electric arc welding machine works normally, the contact part is in contact with the fixed contact, and when the instantaneous current is too large and the moving contact is separated from the fixed contact, the contact part generates electric arc. Because the second end at contact site is connected with the striking section to the striking section is first contained angle with the contact segment, consequently, under the effect of striking of the subassembly of striking the arc of circuit breaker, the arc breaks away from the explosion chamber that the moving contact got into the circuit breaker fast by the second end in the twinkling of an eye that the arc flows towards the striking section. Therefore, the electric arc stays on the moving contact for a very short time, and the moving contact cannot be burnt or burnt to a very small degree. Therefore, the utility model provides a circuit breaker's beneficial effect includes: the arc extinguishing device has the advantages of higher arc extinguishing speed, better arc extinguishing effect, higher safety and longer service life.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. For a person skilled in the art, it is possible to derive other relevant figures from these figures without inventive effort.

Fig. 1 is a schematic structural diagram of a circuit breaker according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of the movable contact in fig. 1;

fig. 3 is a schematic view of a connection structure of the moving contact, the fixed contact, the arc striking assembly and the arc extinguishing chamber in fig. 1;

FIG. 4 is a cross-sectional view of FIG. 3 at a first perspective;

FIG. 5 is a schematic structural view of the arc chute assembly of FIG. 1;

FIG. 6 is a schematic view of a connection structure between the second flash barrier and the insulating plate in FIG. 5;

FIG. 7 is a schematic structural view of the first flash barrier of FIG. 5;

fig. 8 is a schematic view of a connection structure between the fixed contact and the second arc ignition plate of the arc striking assembly in fig. 3.

Icon: 100-a circuit breaker; 110-moving contact; 111-a support section; 1111-a wiring segment; 1112-mounting holes; 1113-connecting segment; 113-a contact section; 1131 — first end; 1133 — a second end; 1134 — contact surface; 1135 — contact; 115-arc run section; 1151-arc surface; 120-static contact; 130-an arc-striking assembly; 131-an arc-striking channel; 132-a first flash barrier; 1321-a support arm; 1323-positioning ribs; 1325-a first mounting groove; 133-a second flash barrier; 1331-a second mounting groove; 134-an insulating plate; 1341-a card slot; 135-a first arc starting plate; 136-a second arc striking plate; 140-an arc chute; 150-an elastic member; 160-circuitry; 170-instantaneous release; 175-time delay release; 180-an operating mechanism; 190-a housing; 191-stop bump.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are merely for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the device or element that is referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The following describes in detail embodiments of the present invention with reference to the accompanying drawings.

Examples

Referring to fig. 1, the circuit breaker 100 provided in this embodiment is applied to various circuits or electrical devices to protect the circuits and the electrical devices.

The circuit breaker 100 includes a housing 190, and a movable contact 110, a stationary contact 120, an arc striking assembly 130, an arc extinguishing chamber 140, an elastic member 150, a circuit system 160, an instantaneous release 170, a time delay release 175, and an operating mechanism 180 respectively disposed in the housing 190. The moving contact 110 is connected to one of the input and output terminals of the circuit system 160, and the fixed contact 120 is connected to the other of the input and output terminals of the circuit system 160. The movable contact 110 is connected to the operating mechanism 180 and the elastic element 150, and is used for contacting and communicating the circuit system 160 with the fixed contact 120 under the combined action of the operating mechanism 180 and the elastic element 150, and when the instantaneous current of the circuit system 160 is too large, the instantaneous release 170 is released and pulls the operating mechanism 180 to act, or when a long-time overload current occurs, the delay release 175 acts to trigger the operating mechanism 180 to act. Under the combined action of the operating mechanism 180 and the elastic element 150, the movable contact 110 is separated from the stationary contact 120, so that the circuit system 160 is disconnected. The arc-quenching assembly 130 is disposed between the arc-quenching chamber 140 and the moving contact 110 and the static contact 120, and is configured to quench an arc generated when the moving contact 110 and the static contact 120 are separated from contact with each other, and flow into the arc-quenching chamber 140.

Referring to fig. 2, the movable contact 110 of the circuit breaker 100 is different from a conventional linear structure, the movable contact 110 includes a support section 111, a contact section 113 and an arc striking section 115, the support section 111 is connected to the circuit system 160 and is connected to the operating mechanism 180 and the elastic member 150, in this embodiment, the elastic member 150 is a tension spring, one end of the tension spring is fixed to the housing 190, and the other end of the tension spring is connected to the support section 111. The contact section 113 is provided with a first end 1131 and a second end 1133 far away from the first end 1131, the first end 1131 is connected with the support section 111, the second end 1133 is connected with the arc striking section 115, the second end 1133 is provided with a contact portion 1135 for contacting with the static contact 120, and the contact section 113 and the support section 111 form a first included angle. The arc striking section 115 plays a role of current guiding and is driven by the contact section 113 to rotate at a certain angle so as to guide the arc to the arc extinguishing chamber 140.

In practical applications, when the circuit breaker 100 normally works, the contact portion 1135 contacts the fixed contact 120, when an instantaneous current is too large, the instantaneous release 170 is tripped, the support section 111 rotates in a direction away from the fixed contact 120 under the combined action of the operating mechanism 180 and the elastic member 150, an electric arc is generated when the contact portion 1135 is separated from the fixed contact 120, and under the action of the arc-striking assembly 130, the electric arc is separated from the movable contact 110 from a corner of the second end 1133 and the arc-striking section 115 at the moment that the electric arc flows toward the arc-striking section 115 and rapidly enters the arc-extinguishing chamber 140 of the circuit breaker 100, the electric arc stays on the movable contact 110 for a very short time, and the movable contact 110 cannot be burned or burned to a very small extent.

Therefore, the moving contact 110 greatly shortens the staying time of the arc, and has a longer service life, and the circuit breaker 100 provided with the moving contact 110 in the embodiment has a faster arc extinguishing speed, a better effect and a longer service life.

In the present embodiment, the arc striking section 115 is linear, and in other embodiments, if the arc striking section 115 is entirely curved, an included angle between a substantially central line of the arc striking section 115 and the contact section 113 is defined as a first included angle.

In order to further increase the reaction speed, safety and arc extinguishing effect of the movable contact 110, the supporting section 111 and the contact section 113 of the movable contact 110 form a second included angle. The supporting section 111 and the contact section 113 form a lever structure, when the supporting section 111 is acted by the operating mechanism 180 and the elastic element 150, the contact section 113 can quickly respond to rotate by a large angle, so that the moving contact 110 is prevented from being separated from the static contact 120 in time when large instantaneous current flows, fusion welding of the moving contact 110 is avoided, and the arc can be quickly rotated by a large angle, so that the arc can quickly enter the arc extinguish chamber 140 along the arc-striking component 130.

In addition, considering that the internal space of the circuit breaker 100 is limited, the design of the included angle between the supporting section 111 and the contact section 113 can also reduce the occupied space of the moving contact 110 in the linear direction, so that the available space inside the circuit breaker 100 is increased, and the internal structure is more compact. Considering the processing and installation difficulty and avoiding charge concentration, the value range of the second included angle is 10-55 degrees.

In this embodiment, the supporting segment 111 includes a connection segment 1111 and a connection segment 1113, and the connection segment 1111 and the connection segment 1113 form a third angle, and one ends of the connection segments are connected to each other. The end of connection segment 1111 remote from connection segment 1113 is wired to circuitry 160, and the end of connection segment 1113 remote from connection segment 1111 is connected to first end 1131 of contact segment 113. Here, the second included angle refers to an included angle between the contact section 113 and the wire section 1111, and in other embodiments, the second included angle refers to an included angle between the end of the support section 111 actually connecting the contact section 113 and the contact section 113.

The connection point of the elastic member 150 is disposed on the connection segment 1113, the connection point of the connection segment 1111 and the connection segment 1113 is disposed with a mounting hole 1112, and the support segment 111 is connected to the operating mechanism 180 through the mounting hole 1112. In this embodiment, the third included angle is about 90 °.

Referring to fig. 2, the contact section 113 is a straight line, a contact surface 1134 is disposed on one side of the second end 1133, the contact surface 1134 is a flat surface, and the contact portion 1135 protrudes from the contact surface 1134.

In practical applications, the contact portion 1135 and the contact section 113 may be integrally formed, or the contact portion 1135 and the contact surface 1134 may be clamped or welded together for production and processing according to processing and installation conditions.

The side of the arc ignition section 115 that is connected to the contact surface 1134 is provided with an arc ignition surface 1151, and in the embodiment, the arc ignition surface 1151 has an arc shape. In this embodiment, there is an abrupt change in angle between the arc striking surface 1151 and the contact surface 1134, which is designed to facilitate rapid detachment of the arc, and to the greatest extent, to prevent the arc from entering the arc striking section 115 from the junction between the arc striking surface 1151 and the contact surface 1134. In other embodiments, the striking surface 1151 and the contact surface 1134 may be connected in a smooth transition depending on the actual manufacturing and installation conditions.

In addition, in practical applications, even if the arc is not completely separated from the junction, and a part of the arc enters the arc striking section 115, the part of the arc can be easily separated from the arc striking section 115 through the arc striking surface 1151 due to the gradual change of the angle of the arc striking surface 1151.

In addition, arc striking surface 1151 plays the effect of further enlarging the angle, makes in electric core can be more smooth and easy gets into explosion chamber 140, further promotes circuit breaker 100's arc extinguishing efficiency.

In this embodiment, the supporting section 111, the contact section 113 and the arc striking section 115 are integrally formed, and the connection section 1111 and the connection section 1113 of the supporting section 111 are also integrally formed. In other embodiments, other connection methods such as welding may be adopted according to actual processing conditions.

In practical applications of the movable contact 110, an arc is generated at the moment when the contact portion 1135 disposed on the contact section 113 is separated from the stationary contact 120, and when a portion of the arc enters the second end 1133 of the contact section 113 from the contact portion 1135 and rapidly moves to a connection position between the second end 1133 and the arc leading section 115, because the arc leading section 115 and the second end 1133 form a first included angle, the portion of the arc can be rapidly separated from the movable contact 110 from the second end 1133 of the contact section 113.

If there is an arc that partially enters the arc striking section 115 without completely separating, since the arc striking section 115 is provided with the arc striking surface 1151 with a gradually changing angle, when the partial arc approaches the periphery of the arc striking surface 1151 under the action of the arc striking assembly 130, the partial arc can rapidly separate from the arc striking section 115 through the arc striking surface 1151. Therefore, the movable contact 110 greatly shortens the residence time of the arc, has a longer service life, and can significantly increase the arc extinguishing speed of the circuit breaker 100.

As shown in fig. 3 and fig. 4, the arc-striking component 130 is disposed by the arc-striking channel 131, one end of the static contact 120 is connected to the circuit system 160, the other end of the static contact 120 extends into the arc-striking channel 131 from one end of the arc-striking channel 131, one end of the arc-striking section 115 of the movable contact 110 also extends into the arc-striking channel 131 from the same end, and the arc-extinguishing chamber 140 is disposed at the other end of the arc-striking channel 131.

In practical applications, an arc generated by the contact portion 1135 separating from the stationary contact 120 enters the arc extinguish chamber 140 through the arc-quenching channel 131, and after the contact portion 1135 separates from the stationary contact 120, the support section 111 rotates under the combined action of the operating mechanism 180 and the elastic member 150, so as to drive the support portion to rotate to a preset position in the arc-quenching channel 131.

Referring to fig. 4, the contact portion 1135 is shown in the preset position, and with reference to fig. 4, when the contact portion 1135 is located at this position, an included angle between the contact section 113 and the static contact 120 is opposite to the arc extinguish chamber 140, where the included angle is a sector angle swept by the contact section 113 after the contact portion 1135 is separated from the static contact 120, and is a passage of the arc to the arc extinguish chamber 140.

As shown in fig. 1 and fig. 4, the housing 190 is provided with a stop protrusion 191, when the contact portion 1135 moves to a predetermined position, one side of the contact section 113 away from the contact portion 1135 abuts against the stop protrusion 191, that is, the stop protrusion 191 plays a role of positioning the movable contact 110.

In practical applications, an arc is generated in the angle between the contact segment 113 and the stationary contact 120, and since the angle is opposite to the arc extinguish chamber 140, the arc enters the arc extinguish chamber 140 with a very short stroke. Among the prior art, the motion passageway of electric arc is just to the run-on plate, and electric arc gets into explosion chamber 140 through the run-on plate, compares with this, and in this embodiment, the stroke of electric arc shortens greatly, can get into explosion chamber 140 rapidly, and the arc extinguishing speed of circuit breaker 100 obtains further promotion.

At any time in the process that the contact portion 1135 is separated from the fixed contact 120 and moves to the preset position, the extending direction of the contact segment 113 is always intersected with the arc extinguish chamber 140, so that the arc separated from the contact segment 113 can always directly reach the arc extinguish chamber 140 under the action of the arc-promoting assembly 130, and the arc cannot be blocked in the midway.

In addition, in the present embodiment, at any time in the process that the contact portion 1135 is separated from the fixed contact 120 and moves to the preset position, the extending direction of the arc initiation section 115 is always intersected with the arc extinguish chamber 140, so that even if an arc that is not separated by the second end 1133 of the contact section 113 is separated at any position of the arc initiation section 115, the arc can directly reach the arc extinguish chamber 140 under the action of the arc initiation assembly 130, and is not blocked at all.

Referring to fig. 5, the arc striking assembly 130 includes a first arc isolating plate 132, a second arc isolating plate 133, an insulating plate 134, a first arc striking plate 135 and a second arc striking plate 136, the first arc isolating plate 132 and the second arc isolating plate 133 are disposed on the insulating plate 134 at an interval, the second arc striking plate 136 is also disposed on the insulating plate 134, one end of the second arc striking plate 136 is inserted between the first arc isolating plate 132 and the second arc isolating plate 133, and the first arc isolating plate 132, the second arc isolating plate 133 and the second arc striking plate 136 jointly enclose an arc striking channel 131. Arc extinguishing chamber 140 sets up the one end of striking channel 131 on insulating board 134, and the other end of second striking plate 136 extends to the one end that arc extinguishing chamber 140 is close to insulating board 134 along insulating board 134, and first striking plate 135 sets up in the one end that second striking plate 136 was kept away from to arc extinguishing chamber 140.

Referring to fig. 5 and 6, in this embodiment, for convenience of installation, the second arc isolating plate 133 and the insulating plate 134 are integrally formed, and the insulating plate 134 is provided with a slot 1341 matched with the second arc striking plate 136 for fast installation of the second arc striking plate 136, and after the second arc striking plate 136 is installed on the insulating plate 134, an installation gap exists between the second arc striking plate 136 and the insulating plate 134.

After the second arc ignition plate 136 is installed, the insulation plate 134 is located between the second arc ignition plate 136 and the through electrode in the circuit system 160, and the second arc ignition plate 136 and the through electrode are isolated by the insulation plate 134, so that the safety of the circuit system 160 is improved, and further the safety of the circuit breaker 100 is improved.

As shown in fig. 5, fig. 6 and fig. 7, a supporting arm 1321 and a positioning rib 1323 are respectively protruded on the same side of two opposite ends of the first arc baffle 132, an end wall of the supporting arm 1321 abuts against one side of the second arc baffle 133 close to the first arc baffle 132, and the positioning rib 1323 is inserted into the mounting gap between the second arc plate 136 and the insulating plate 134 to fix the first arc baffle 132.

In the actual installation process, the second arc guiding plate 136 is installed on the insulating plate 134, then the positioning rib 1323 of the first arc isolating plate 132 is inserted into the installation gap between the second arc guiding plate 136 and the insulating plate 134, the end wall of the supporting arm 1321 abuts against the second arc isolating plate 133, and the supporting wall and the positioning rib 1323 support the first arc isolating plate 132 together, so that the installation of the first arc isolating plate 132 is completed. The second arc striking plate 136, the first arc isolating plate 132 and the second arc isolating plate 133, which are located between the first arc isolating plate 132 and the second arc isolating plate 133, together enclose an arc striking channel 131, and the arc extinguishing chamber 140 is installed on one side of the arc striking channel 131 on the insulating plate 134.

One side that first flash barrier 132 kept away from second flash barrier 133 is provided with first mounting groove 1325, one side that first flash barrier 132 was kept away from to second flash barrier 133 is provided with second mounting groove 1331, it is equipped with the magnetism-increasing piece to inlay respectively in first mounting groove 1325 and the second mounting groove 1331, under the effect of two magnetism-increasing pieces, there is extremely strong magnetic field in urging arc passageway 131, can play splendid effect of urging to being in the electric arc that urges arc passageway 131, can enough make the electric arc on the movable contact 110 break away from fast, can also make the electric arc after breaking away from move to in the explosion chamber 140 fast, accelerate arc extinguishing speed.

As shown in fig. 4 and fig. 8, in the present embodiment, an end of the second arc striking plate 136 inserted into the arc striking channel 131 and an end of the static contact 120 inserted into the arc striking channel 131 are located in the same extending direction, and an included angle between an end of the static contact 120 inserted into the arc striking channel 131 and the contact section 113 of the movable contact 110 is opposite to the arc extinguishing chamber 140, so that the second arc striking plate 136 does not obstruct the arc during the process that the arc goes to the arc extinguishing chamber 140, and further, the extremely fast arc extinguishing speed of the circuit breaker 100 provided in the present embodiment is ensured.

When the circuit breaker 100 provided in this embodiment is actually applied to a circuit, under a normal operation condition, the contact portion 1135 of the movable contact 110 contacts the fixed contact 120, and the circuit system 160 is a passage. When a large transient current occurs, the instantaneous release 170 releases to trigger the operating mechanism 180 to operate, or when a long-time overload current occurs, the delay release 175 operates to trigger the operating mechanism 180 to operate. The operating mechanism 180 and the elastic element 150 act on the supporting section 111 of the movable contact 110 together, so as to drive the movable contact 110 to rotate, and the contact portion 1135 is separated from the fixed contact 120 and rotates until one side of the contact section 113 away from the contact portion 1135 abuts against the stop protrusion 191, that is, the contact portion 1135 moves to a preset position.

An arc is generated at the moment when the contact portion 1135 is separated from the stationary contact 120, and after a portion of the arc enters the second end 1133 of the contact section 113 from the contact portion 1135, the arc rapidly moves to the connection position between the second end 1133 and the arc guiding section 115 under the action of the arc acceleration assembly 130, and since the arc guiding section 115 and the second end 1133 form a first included angle, the portion of the arc can be rapidly separated from the movable contact 110 from the second end 1133 of the contact section 113.

If the arc does not completely break away and partially enters the arc striking section 115, because the arc striking section 115 is provided with the arc striking surface 1151 with the gradually changing angle, when the partial arc approaches the periphery of the arc striking surface 1151 under the action of the arc striking assembly 130, the partial arc can rapidly break away from the arc striking section 115 through the arc striking surface 1151. Since the first angle is opposite to the arc extinguishing chamber 140, the arc released from the contact section 113 or the arc striking section 115 can reach the arc extinguishing chamber 140 quickly. Therefore, the movable contact 110 greatly shortens the residence time of the arc, has a longer service life, and can significantly increase the arc extinguishing speed of the circuit breaker 100.

When the contact portion 1135 moves to the preset position, the included angle between the contact segment 113 and the fixed contact 120 corresponds to the arc extinguish chamber 140, and the arc in the included angle between the contact segment 113 and the fixed contact 120 greatly shortens the stroke of the arc because the included angle is opposite to the arc extinguish chamber 140, and can rapidly enter the arc extinguish chamber 140, so that the arc extinguishing speed of the circuit breaker 100 is further increased.

In conclusion, the circuit breaker 100 provided by the embodiment has a faster arc extinguishing speed and a better arc extinguishing effect, and is higher in safety and longer in service life.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (14)

1. A moving contact is characterized by comprising a support section, a contact section and an arc ignition section;

the supporting section is used for connecting an operating mechanism of the circuit breaker and externally connecting a circuit;

the contact section is respectively provided with a first end and a second end far away from the first end, the first end is connected with the support section, and the second end is provided with a contact part used for contacting with a fixed contact of the circuit breaker;

the arc striking section is connected with the second end and forms a first included angle with the contact section.

2. The movable contact of claim 1, wherein the support section and the contact section form a second included angle, and the angle of the second included angle is 10-55 °.

3. The movable contact of claim 1 wherein one side of said second end is provided with a contact surface, said contact surface is a flat surface, and said contact portion protrudes from said contact surface.

4. The movable contact according to claim 3 wherein said arc initiation section has an arc initiation surface, said arc initiation surface being arcuate and said arc initiation surface being connected to said contact surface.

5. The movable contact according to claim 1, wherein the supporting segment comprises a connection segment and a connection segment connected to each other, the connection segment and the connection segment form a third included angle, an end of the connection segment away from the connection segment is connected to the first end, an end of the connection segment away from the connection segment is used for an external circuit, and a connection portion of the connection segment and the connection segment is used for being connected to an operating mechanism of the circuit breaker.

6. A circuit breaker, characterized in that, includes a fixed contact and the movable contact according to any one of claims 1-5, the support section is connected with an operating mechanism of the circuit breaker, and is used for driving the contact portion to contact with or separate from the fixed contact and move to a preset position under the action of the operating mechanism.

7. The circuit breaker according to claim 6, further comprising an arc extinguish chamber, wherein when the contact portion moves to the preset position, an included angle between the contact section and the fixed contact corresponds to the arc extinguish chamber.

8. The circuit breaker according to claim 7, wherein the extending direction of the contact section intersects with the arc extinguishing chamber during the process that the contact portion is separated from the fixed contact and moves to the preset position.

9. The circuit breaker according to claim 7, wherein the extension direction of the arcing section intersects with the arc extinguishing chamber during the process that the contact portion is separated from the fixed contact and moves to the preset position.

10. The circuit breaker according to claim 7, further comprising an arc striking assembly, wherein the arc striking assembly is provided with an arc striking channel, the fixed contact is accommodated in the arc striking channel, the movable contact is inserted from one end of the arc striking channel, and the arc extinguishing chamber is arranged at the other end of the arc striking channel.

11. The circuit breaker according to claim 10, wherein the arc striking assembly includes a first arc baffle, a second arc baffle, an insulating plate, a first arc striking plate and a second arc striking plate, the first arc baffle and the second arc baffle are disposed on the insulating plate at an interval, the second arc striking plate is disposed on the insulating plate, one end of the second arc striking plate is inserted between the first arc baffle and the second arc baffle and encloses the arc striking channel together with the first arc baffle and the second arc baffle, the other end of the second arc striking plate extends to one end of the arc extinguishing chamber, and the first arc striking plate is disposed at one end of the arc extinguishing chamber away from the second arc striking plate.

12. The circuit breaker according to claim 11, wherein a supporting arm and a positioning rib are respectively protruded from one side of the first arc splitter plate close to the second arc splitter plate, an end wall of the supporting arm abuts against the second arc splitter plate, a gap is formed between the second arc striking plate and the insulating plate, and the positioning rib is inserted into the gap.

13. The circuit breaker of claim 11, wherein a first mounting groove is formed in a side of the first arc isolating plate away from the second arc isolating plate, a second mounting groove is formed in a side of the second arc isolating plate away from the first arc isolating plate, and a magnetism increasing sheet is embedded in each of the first mounting groove and the second mounting groove.

14. The circuit breaker according to claim 6, further comprising a housing and an elastic member, wherein two ends of the elastic member are respectively connected to the supporting section and the housing, and the elastic member is configured to drive the movable contact to rotate so as to drive the contact portion to move to the predetermined position.

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