WO2022000272A1

WO2022000272A1 - Circuit breaker

Info

Publication number: WO2022000272A1
Application number: PCT/CN2020/099307
Authority: WO
Inventors: 郭得道; 袁从飞
Original assignee: 浙江沃斯托电气有限公司
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2022-01-06

Abstract

The present invention provides a circuit breaker, comprising a housing, a contact support member, a counterforce elastic member, a movable contact, a static contact, a lock fastener, a handle, a connecting rod, and a tripper. The contact support member comprises a body portion, a drive portion, and an elastic energy storage portion; the body portion is rotatably connected to the housing by means of a fulcrum rotation shaft; the drive portion and the elastic energy storage portion are respectively located at both sides of the fulcrum rotation shaft; the drive portion is connected to the handle by means of the connecting rod. The movable contact is connected to the elastic energy storage portion; during overrun rotation of the handle, the movable contact abuts against the static contact, and the body portion moves relative to the movable contact; a displacement difference is generated between two ends of the elastic energy storage portion, and the two ends are bent to generate a rebound force directing to the static contact, so as to press the movable contact against the static contact.

Description

breaker

technical field

The invention relates to the technical field of low-voltage electrical protection, and in particular to a circuit breaker.

Background technique

A circuit breaker is a switching device that can close, carry and break current under normal circuit conditions, and can carry and break current under abnormal circuit conditions within a specified time. Traditional circuit breakers generally include shells, handles, connecting rods, static contacts, moving contacts, contact supports, jumpers, locks, levers, lock springs, contact springs, return springs, electromagnetic releases, thermal The trip unit, arc extinguishing system, etc. have complex structures, difficult assembly and high cost.

In order to solve the above problems, a circuit breaker using the combination of the driving wheel and the trip frame to make the moving contact and the static contact contact or separate has also appeared on the market. In the circuit breaker of this structure, the driving wheel and the trip frame are replaced. The functions of multiple components such as jumpers, locks, levers, and contact supports in traditional circuit breakers are simplified, and the structure is simplified. However, in this type of circuit breaker using the driving wheel and the release, in order to realize the overtravel of the movable and static contacts in the locked state to ensure the reliable closing of the two, it is necessary to install between the driving wheel and the movable contact Contact compression spring to press the moving contact on the stationary contact. When the static contact is worn, burnt or electric repulsion, the reaction force of the contact pressure spring will make the moving contact press tightly on the static contact, so as to achieve effective closing. In order to realize the installation of the contact compression spring, the drive wheel needs to have a accommodating groove, the movable contact is fixed in the accommodating groove, and the two ends of the contact compression spring are respectively installed between the movable contact and the inner wall of the accommodating groove. Limited by the space in the accommodating groove, the installation of the movable contact and the contact pressure spring is very difficult, the installation efficiency is low, and the quality after installation is also difficult to control. In addition, when the contact pressure needs to be adjusted, springs with different elastic forces and different lengths need to be replaced. Likewise, the adjustment of the contact pressure is very difficult due to the limitation of the space of the accommodating groove.

In addition, the setting of the accommodating groove itself increases the volume of the driving wheel, and the setting of the accommodating groove weakens the strength of the driving wheel, especially the driving wheel of plastic structure is particularly obvious, in order to ensure that the driving wheel has a certain strength, it needs to increase The thickness or width of the drive wheel, thereby further increasing the volume of the drive wheel. The trip frame is rotatably fastened to the drive wheel, and the increase in the volume of the drive wheel will inevitably increase the volume of the trip frame. Therefore, the whole circuit breaker is bulky and expensive.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the prior art, the present invention provides a circuit breaker with a simple structure and a small volume.

In order to achieve the above object, the present invention provides a circuit breaker, which includes a housing, a contact support member, a reaction force elastic member, a movable contact, a static contact, a lock, a handle, a connecting rod and a release. The contact supporter includes a body part, a driving part and an elastic energy storage part. The body part is rotatably connected to the housing through a fulcrum shaft. The driving part and the elastic energy storage part are respectively located on both sides of the fulcrum shaft; . The moving contact is connected to the elastic energy storage part. When the handle is over-turned, the moving contact abuts the static contact, the body part moves relative to the moving contact, and the two ends of the elastic energy storage part generate a displacement difference and bend, resulting in a point to the static contact. The resilience of the contacts to press the moving contacts against the stationary contacts.

According to an embodiment of the present invention, the movable contact and the elastic energy storage part are overlapped and connected, and the overlapping connection part of the elastic energy storage part and the movable contact is the resilience adjustment area, and the length of the resilience adjustment area is adjusted to adjust the resilience. .

According to an embodiment of the present invention, the contact support further includes a connecting portion connecting the body portion and the elastic energy storage portion, the connecting portion is bent and extended relative to the body portion in the thickness direction and then connected to the elastic energy storage portion.

According to an embodiment of the present invention, the latch is rotatably connected to the contact support member and forms a linkage state or a tripping state with the driving part to lock or unlock the connecting rod connected to the handle, and the latch elastic member is connected to the latch and the contact support.

According to an embodiment of the present invention, the lock includes a lock body, a trip trigger portion, a hook portion, and a lock portion, the lock body is rotatably connected to the body portion of the contact support member, and the trip trigger portion and the hook portion are respectively located at On both sides of the lock body, the locking portion is formed on the hook portion and protrudes toward the inner side of the hook portion. The lock body, the hook portion and the locking portion enclose a first bayonet, and the driving portion is provided with the first bayonet. Facing the opposite second bayonet, in the interlocking state, the outer side wall of the locking portion and the side wall of the second bayonet abut against the two sides of the other end of the connecting rod respectively and lock it; in the tripping state, the lock The stop part releases the locking of the other end of the connecting rod, and the other end of the connecting rod is parked in the first bayonet.

According to an embodiment of the present invention, the other end of the driving part opposite to the first bayonet is provided with at least one groove, and the locking elastic member is sleeved and fixed between the two grooves or one of the grooves and the outer side of the driving part between the walls.

According to an embodiment of the present invention, the lock further includes a rotation trigger portion, the rotation trigger portion is disposed on the trip trigger portion and extends to the side where the contact support member is located, and the rotation trigger portion is located between the static contact and the elastic energy storage portion between.

According to an embodiment of the present invention, the trip unit includes a thermal trip unit, the thermal trip unit includes a bimetallic sheet and a trip rod, the bottom of the bimetallic sheet abuts against the bimetallic adjusting screw, and the surface of the bimetallic sheet abuts on the surface of the bimetallic sheet The included angle with the axis of the double gold adjusting screw is greater than or equal to 75 degrees and less than or equal to 105 degrees.

According to an embodiment of the present invention, the bimetal sheet includes a first part, a second part and a third part from bottom to top, the first part abuts against the double metal adjusting screw, and the surface of the first part and the axis of the double metal adjusting screw are in contact with each other. The included angle is greater than or equal to 75 degrees and less than or equal to 105 degrees, the second part is bent relative to the first part to the side where the static contact is located, and the third part is bent relative to the second part to the side away from the static contact.

According to an embodiment of the present invention, the circuit breaker further includes an arc-extinguishing chamber disposed in the housing and a plurality of exhaust guide pieces located on one side of the arc-extinguishing chamber, and an air guide channel is formed between the plurality of exhaust guide pieces to extinguish the arc. The gas generated after the arc is extinguished in the chamber is discharged through the air guide channel.

To sum up, the contact support member in the circuit breaker provided by the present invention includes a body portion, a driving portion, and an elastic energy storage portion, and the elastic energy storage portion is connected to the movable contact. When the handle rotates over-travel, the handle drives the main body to continue to rotate through the connecting rod and the driving part, and at this time, the movable contact has been abutted and limited by the static contact. The relative movement between the body part and the moving contact causes a displacement difference between the two ends of the elastic energy storage part, and the elastic energy storage part bends and generates a rebound force directed to the static contact, which presses the moving contact against the static contact. on the head. When the static contact wears, burns or electric repulsion, etc., the elastic deformation of the elastic energy storage part recovers to compensate for the distance caused by the static contact wear, burn or electric repulsion, etc., so that the moving contact can be tightly Abutting on the static contact to ensure the reliability of closing. The circuit breaker provided by the invention can realize the reliable contact of the movable and static contacts without setting the contact pressure spring, and the structure of the contact support is very simple, and only needs to connect the movable contact to the elastic energy storage part during installation. , the assembly is very easy, not only the assembly efficiency is high, but also the reliability and consistency of the assembled products are very good. In addition, the omission of the contact pressure spring also greatly simplifies the volume of the contact support, thereby realizing the miniaturization of the circuit breaker.

Furthermore, in the circuit breaker provided by the present invention, the length of the bending deformation part on the elastic energy storage part is adjusted to be different, and the pressure exerted on the movable contact during overtravel will also be different; Adjust the contact pressure by bending the length of the deformed part. The adjustment of the length of the bending deformation part is very free and not limited by any space, so it can well match the circuit breakers with different contact pressure requirements, that is, it has better design versatility.

In order to make the above-mentioned and other objects, features and advantages of the present invention more obvious and easy to understand, the preferred embodiments are hereinafter described in detail together with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic structural diagram of a circuit breaker provided in an embodiment of the present invention in a tripping state.

FIG. 2 is an enlarged schematic view of the position A in FIG. 1 .

FIG. 3 is a schematic view of the structure of the dynamic and static contacts of the circuit breaker shown in FIG. 1 in the direction of contact.

FIG. 4 is an enlarged schematic view of B in FIG. 3 .

FIG. 5 is a schematic structural diagram of FIG. 3 from another viewing angle.

FIG. 6 is an exploded schematic view of the contact holder and the latch in FIG. 1 .

FIG. 7 is a schematic diagram showing the structure of the contact supporter mounted on the housing.

FIG. 8 is a schematic diagram showing the connection between the contact holder and the movable contact.

Figure 9 is a schematic diagram of the structure of the lock.

FIG. 10 is a schematic diagram showing the connection of the contact holder, the latch and the thermal release in FIG. 1 .

FIG. 11 is a schematic structural diagram of the bimetallic sheet and the bimetallic adjusting screw in FIG. 1 .

detailed description

As shown in FIG. 1 to FIG. 10 , the circuit breaker provided in this embodiment includes a housing 1, a contact support member 2, a reaction force elastic member 3, a movable contact 4, a static contact 5, a lock 6, a handle 7, connecting rod 8 and release 9. The contact support member 2 includes a main body portion 21 , a driving portion 22 and an elastic energy storage portion 23 . The main body portion 21 is rotatably connected to the housing 1 through a fulcrum shaft 101 , and the driving portion 22 and the elastic energy storage portion 23 are respectively located at two sides of the fulcrum shaft 101 . On the other hand, the driving part 22 is connected to the handle 7 through the connecting rod 8 . The movable contact 4 is connected to the elastic energy storage portion 23 . When the handle 7 is rotated over-travel, the movable contact 4 abuts against the static contact 5 , the body portion 21 moves relative to the movable contact 4 , and the ends of the elastic energy storage portion 23 generate The displacement is poor and bends, producing a rebound force directed to the stationary contact to press the movable contact 4 against the stationary contact 5 .

Figures 1 and 2 are schematic diagrams of the structure of the circuit breaker in a tripping state, and Figures 3 and 4 are schematic diagrams of the structure of the circuit breaker in a linked state. The working principle of the circuit breaker closing and tripping will be described in detail below with reference to FIGS. 1 to 4 . "Clockwise", "counterclockwise", "left", "right", "up" and "down" mentioned in the text are for the corresponding diagrams, only for the convenience of explaining the working principle of the circuit breaker in detail, not used to limit the invention. The direction indicated by the arrow K in FIG. 1 and FIG. 3 is the clockwise direction, and the direction opposite to this direction is the counterclockwise direction.

During the use of the circuit breaker, the moving contact and the static contact will be worn after the continuous opening and closing; the contact may also be burned after the load opening and closing; An electrical repulsion is generated between them. In order to make the moving contact and the static contact contact reliably when the above situation occurs, the moving contact needs to be tightly pressed on the static contact to achieve reliable closing. In the circuit breaker provided in this embodiment, the contact support member 2 has an elastic energy storage portion 23 , and the movable contact 4 is connected to the elastic energy storage portion 23 . During the closing process, the handle 7 acts on the driving part 22 through the connecting rod 8 to make the contact supporter 2 rotate clockwise around the fulcrum shaft 101 , and the elastic energy storage part 23 drives the moving contact 4 to gradually move toward the stationary contact 5 sports. When the movable contact 4 abuts against the stationary contact 5, the handle 7 enters the overtravel state. In the overtravel state, the driving part 22 and the body part 21 of the contact holder continue to follow the movement of the connecting rod 8 ; and the movable contact 4 is limited by the abutment of the stationary contact 5 and no longer moves. The relative movement of the body portion 21 and the movable contact 4 causes a displacement difference between the two ends of the elastic energy storage portion 23 , and this displacement difference causes the elastic energy storage portion 23 to bend and deform. In this embodiment, in terms of the orientation shown in FIG. 3 , the elastic energy storage portion 23 is convexly bent to the right (the side where the static contact is located), and the bending deformation of the elastic energy storage portion 23 is generated on the movable contact 4 The resilient force is directed to the stationary contact 5 and is stored in the bending deformation, thereby pressing the movable contact 4 tightly against the stationary contact 5 . When a gap is generated between the movable and static contacts due to wear, burnout or repulsive force, the elastic deformation of the elastic energy storage portion 23 is partially restored, and the movable contact 4 moves toward the stationary contact 5 to compensate for the gap between the two. The resilient force stored by the elastic deformation of the contactor continues to press the movable contact 4 on the stationary contact 5, so as to realize the reliable closing of the two.

Compared with the traditional use of the reaction force between the contact compression springs to achieve reliable closing in the case of wear, burnout or electric repulsion of the dynamic and static contacts, the circuit breaker provided in this embodiment is to release the elastic energy storage part 23 The deformation of the product and the resilience generated by the deformation are realized. The structure of the whole product is very simple and easy to assemble. Since the circuit breaker provided in this embodiment does not need to be provided with a contact pressure spring, the problems of high installation difficulty, large size of the circuit breaker and high cost caused by the contact pressure spring in the existing circuit breaker can be well solved.

When the handle overtravel range is determined, the magnitude of the resilience depends on the elastic coefficient of the elastic energy storage portion 23 and the length of the deformed portion thereof. Therefore, in the design, the elastic force can be adjusted by adjusting the length of the deformed part of the elastic energy storage part 23; Reliable contact between contacts and static contacts. In this embodiment, the movable contact 4 is connected to the elastic energy storage portion 23 in an overlapping manner. Since the movable contact 4 is made of a rigid material, when the movable contact 4 is overlapped with the elastic energy storage portion 23, the connecting portion will no longer be bent. , so the length of the deformed part can be adjusted by adjusting the length of the connecting part. Specifically, when the length of the elastic energy storage portion 23 is constant, the shorter the length of the connection portion between the elastic energy storage portion 23 and the movable contact 4, the longer the length of the deformation portion, and the greater the resilience generated by the deformation.

In this embodiment, the overlapping connection between the movable contact 4 and the elastic energy storage portion 23 not only realizes the reliable connection between the two; furthermore, this connection method also greatly simplifies the adjustment of the resilience, so that this embodiment provides The circuit breaker has good versatility.

In this embodiment, as shown in FIG. 7 , the movable contact 4 includes a contact body 41 and a contact connecting portion 42 connected to the elastic energy storage portion 23 . The contact body 41 is bent relative to the contact connecting portion 42 to the side where the stationary contact 5 is located, and the angle formed by the bending is α. As shown in FIG. 1 and FIG. 3 , the smaller the bending angle α between the contact body 41 and the contact connecting portion 42 is, the earlier the movable contact 4 will abut the stationary contact 5 when it rotates. Movement of the handle enters overtravel. Therefore, the smaller the bending angle α is, the greater the overtravel distance will be, and the greater the deformation of the elastic energy storage portion 23 will be, so the generated contact pressure will also be greater. Therefore, in the design, the contact pressure can also be adjusted by adjusting the bending angle of the movable contact and the bending deformation amount of the elastic energy storage portion 23, and the design is very flexible.

In this embodiment, the elastic energy storage portion 23 is connected to the main body portion 21 through the main body connection portion 24 , and the main body connection portion 24 is bent and extended relative to the main body portion 21 in the thickness direction and then connected to the elastic energy storage portion 23 . The arrangement of the body connecting portion 24 greatly increases the connecting surface area of the body portion 21 and the elastic energy storage portion 23 without increasing the thickness of the body portion 21 , thereby greatly improving the connection strength of the two. Preferably, the driving part 22, the body part 21, the connecting part 24 and the elastic energy storage part 23 are integrally formed and made of elastic thin metal material. However, the present invention is not limited to this. In other embodiments, the elastic energy storage portion can also be detachably connected to the body portion.

In this embodiment, the reaction force elastic member 3 is a torsion spring sleeved on the pivot shaft 101 and fixedly connected to the driving portion 22 of the contact support member, and the contact support member has a torsion spring end fixing hole. Compared with the tension spring connected between the runner and the casing in the existing circuit breaker, the installation of the torsion spring sleeved on the fulcrum shaft 101 and located below the contact support member 2 is simpler and more convenient and does not occupy the casing 1 Additional installation space inside, thus further reducing the size of the circuit breaker. In addition, when tripping, compared with the reverse restoring force provided by the traditional compression tension spring, the restoring force of the torsion spring after the energy storage will more quickly separate the moving contact 4 and the static contact 5, effectively preventing the moving contact The head 4 shakes and causes secondary arcing. However, the present invention is not limited to this. In other embodiments, the reaction force elastic member may also be a tension spring in a conventional circuit breaker.

In the circuit breaker provided in this embodiment, the arrangement of the elastic energy storage portion 23 simplifies the installation steps and improves the installation efficiency under the condition that the requirements of the traditional circuit breaker are met; in addition, this arrangement also greatly simplifies the structure of the contact support member 2 , the miniaturization of the contact holder 2 further simplifies the structure of the latch connected to it. Specifically, in this embodiment, the lock 6 includes a trip trigger portion 61 , a lock body 62 , a hook portion 63 and a locking portion 64 . The lock body 62 is rotatably connected to the body portion 21 through the lock shaft 65 , and the trip trigger portion 61 and the hook portion 63 are located on two sides of the lock body 62 respectively. The locking portion 64 is formed on the hook portion 63 and protrudes toward the inside of the hook portion 63 . The locking body 62 , the hook portion 63 and the locking portion 64 enclose a first bayonet 601 . There is a second bayonet 201 facing opposite to the first bayonet 601 . In the linkage state, the outer side wall of the locking portion 64 and the side wall of the second bayonet 201 abut against the two sides of the other end 81 of the connecting rod respectively and lock them; in the tripping state, the locking portion 64 is released When the other end 81 of the connecting rod is locked, the other end 81 of the connecting rod rests in the first bayonet 601 .

In order to realize the linkage between the lock 6 and the contact holder 2, in this embodiment, as shown in FIG. 1, a lock elastic member 10 is arranged between the lock 6 and the contact holder 2, and the handle 7 drives the The contact holder 2 rotates around the pivot shaft 101 , and the latch elastic member 10 pushes the latch 6 to rotate along with the contact holder 2 and engage with the driving part 22 to form a linkage state. In this embodiment, the latch elastic member 10 is a compression spring. In order to further reduce the volume of the contact support member 2, the other end of the driving portion 22 opposite to the second latch 201 is provided with two grooves 202. A compression spring positioning boss 203 is formed between the grooves. One end of the compression spring is fixed to the compression spring positioning boss 203 , and the other end is fixed to the lock body 62 . The arrangement of the pressure spring positioning boss 203 not only simplifies the fixing method of the locking elastic member 10 but also greatly facilitates the installation of the locking elastic member 10 . However, the present invention does not impose any limitation on the number of grooves. In other embodiments, the driving portion may have only one groove.

As shown in FIG. 1 and FIG. 2 , in the tripping state, the locking portion 64 and the side wall of the second bayonet 201 are located on the same side of the other end 81 of the connecting rod, and the other end 81 of the connecting rod is parked on the first bayonet Inside 601. When the handle 7 is pushed and overcomes the reaction force of the handle torsion spring to move the handle clockwise relative to the housing 1, the other end 81 of the connecting rod quickly abuts the side wall of the second bayonet 201, and the right side wall of the locking portion 64 Abutting on the left side of the other end 81 of the connecting rod, the right side wall of the locking portion 64 and the side wall of the second bayonet 201 abut on both sides of the other end 81 of the connecting rod respectively. The pre-pressure generated by the latch elastic member 10 connected between the latch 6 and the contact holder 2 in a pre-pressed state will cause the right side wall of the locking portion 64 and the side wall of the second bayonet 201 to The other end 81 of the connecting rod locks the second bayonet 201 to ensure that the connecting rod 8 does not slip, and the handle 7 pushes the contact holder 2 and the locking catch 6 to link clockwise through the connecting rod 8 .

When the moving contact 4 and the static contact 5 are just in contact, the connecting line between the two ends of the connecting rod 8 is located above the rotation center of the handle 4. If the force acting on the handle 7 is removed at this time, the handle torsion spring and the reaction force Under the action of the elastic member 3 , the handle 7 will rotate counterclockwise relative to the housing 1 and return to its original position. The contact holder 2 and the latch 6 also return to their original positions, the movable contact 4 will be separated from the static contact 5, and the two cannot achieve stable closing. Therefore, when the movable contact 4 and the stationary contact 5 are just in contact, the handle 7 needs to continue to be rotated (handle overtravel) so that the line connecting the two ends of the connecting rod 8 is located below the rotation center of the handle 4 . At this time, the reaction force of the reaction force elastic member 3 is the force that makes the handle 7 rotate clockwise and this force is greater than the counterclockwise restoring force of the handle torsion spring. At this time, if the force acting on the handle 7 is removed, the handle 7 will not automatically Return to the original position to achieve closing. When the handle 7 enters the overtravel state, the body portion 21 continues to rotate clockwise with the handle 7 , and the movable contact 4 is limited by the abutment of the stationary contact 5 and no longer rotates with the body portion 21 . The relative movement of the body portion 21 and the movable contact 4 causes a displacement difference between the two ends of the elastic energy storage portion 23. The elastic energy storage portion 23 bends and protrudes toward the side where the static contact 5 is located, and the bending deformation is on the movable contact. A resilient force towards the stationary contact is generated, and the resilient force presses the movable contact 4 tightly on the stationary contact 5 without separation, as shown in FIG. 3 and FIG. 4 .

When the circuit is short-circuited or overloaded, the trip unit 9 triggers the trip triggering part 61 in the state of FIG. 3 to make the lock 6 rotate counterclockwise, the locking part 64 releases the lock on the left side of the other end 81 of the connecting rod, and the lock 6 and the drive unit 22 are in a tripped state. At this time, the reaction force of the reaction force elastic member 3 can no longer act on the handle 7 through the connecting rod 8, and the handle 7 is reset under the action of the handle torsion spring. At the same time, the reaction force elastic member 3 drives the contact support member 2 , the latch 6 and the movable contact 4 to move counterclockwise, and the movable contact 4 is separated from the stationary contact 5 . The circuit breaker returns to the state shown in Figure 1.

In this embodiment, as shown in FIG. 6 , the latch 6 further includes a rotation trigger portion 66 . The rotation trigger portion 66 is disposed on the trip trigger portion 61 and extends to the side where the contact holder 2 is located, and the rotation trigger portion 66 is rotated. It is located between the static contact 5 and the elastic energy storage part 23 . When the trip trigger part 61 is triggered by the trip unit 9 to rotate the lock 6 counterclockwise, the rotation trigger part 66 will quickly touch the elastic energy storage part 23 , and the elastic energy storage part 23 quickly drives the movable contact 4 to rotate counterclockwise , to speed up the separation of the moving contact 4 and the static contact 5, and further reduce the possibility of secondary arcing.

In this embodiment, as shown in FIG. 1 , the release 9 includes a short-circuit release 91 and an overheat release 92 . The short-circuit release 91 is an electromagnetic release and is arranged opposite to the trip triggering part 61 , and the static contact 5 is connected to the electromagnetic release. The side where it is located moves and triggers the trip trigger part 61 , the lock 6 and the drive part 22 are in a trip state, and the movable contact 4 and the static contact 5 are separated.

The thermal release 92 includes a bimetallic sheet 921, a trip rod 924, and a bimetallic adjusting screw 925. The bottom of the bimetallic sheet 921 abuts the bimetallic adjusting screw 925, and the surface of the bimetallic sheet 921 contacts the bimetallic adjusting screw 925. The angle between the axes of 925 is greater than or equal to 75 degrees and less than or equal to 105 degrees. Preferably, the included angle θ between the surface of the bimetal sheet 921 and the axis of the bimetal adjusting screw 925 is equal to 95 degrees. However, the present invention is not limited to this. In other embodiments, the included angle between the surface of the bimetallic sheet and the axis of the bimetallic adjusting screw may be other angle values within 75 degrees to 105 degrees.

In the existing thermal release, the longitudinal section of the bimetal is an inclined surface. When the dual-metal adjustment screw is rotated to adjust the thermal trip sensitivity, the end of the dual-metal adjustment screw will move along the inclined surface of the bimetal. , so that it is difficult to achieve sensitive adjustment. In the thermal release 92 provided in this embodiment, the angle θ between the surface of the bimetallic sheet 921 and the axis of the bimetallic adjusting screw 925 is equal to 95 degrees, and the force generated by the movement of the bimetallic adjusting screw 925 is mainly along the vertical direction. The direction acts on the surface of the bimetal, and the slight adjustment on the double gold adjustment screw can be converted into the displacement of the top of the bimetal, so it has good adjustment sensitivity and the double gold adjustment screw is no longer along the bimetal during adjustment. surface movement.

In this embodiment, as shown in FIG. 11 , the bimetal 921 includes a first part 9211 , a second part 9212 and a third part 9213 from bottom to top, the first part 9211 is clamped by the connecting piece 922 and the arc striking piece 923 , The double gold adjusting screw 925 is abutted on the outer side of the connecting piece 922 , and the angle between the surface of the first part 9211 and the axis of the double gold adjusting screw 925 is equal to 95 degrees. The second portion 9212 is bent relative to the first portion 9211 toward the side where the stationary contact 5 is located, and the third portion 9212 is bent toward the side away from the stationary contact 5 relative to the second portion 9212 . The bimetal 921 provided in this embodiment has two turns. However, the present invention is not limited to this. In other embodiments, the bimetal sheet may not be provided with the third part. Specifically, when the double gold adjusting screw 925 pushes the first part 9211 inward (moves to the left in FIG. 11 ), under the action of the metal connecting piece 922 and the arc striking piece 923 , the second part 9212 and the third part 9213 will move away from the stationary contact 5 (to the right). When the double gold adjusting screw 925 is rotated and withdrawn, the first part 9211 is reset to the right, and the corresponding second part 9212 and the third part 9213 will move to the left.

As shown in FIG. 3 , the housing 1 has a guide groove 102 whose opening is toward the turn of the trip lever. One end of the tripping rod 924 is fixed to the tripping trigger portion 61 , and the other end is bent and protrudes into the guide groove 102 . When the circuit is overloaded, the bimetal 921 is heated to bend to the side away from the stationary contact 5 (bends to the right in FIG. 3 ) and pulls the tripping rod 924 to the right, and the tripping rod 924 drives the tripping trigger portion 61 counterclockwise Turn to achieve overheating trip. The setting of the guide groove 102 guides and limits the movement trajectory of the tripping rod 924 caused by the deformation of the bimetallic sheet 921, so that the force generated by the slight deformation of the bimetallic sheet 921 can quickly act on the tripping trigger through the tripping rod 924. On the part 61, the fault response speed of the circuit breaker is greatly improved.

In this embodiment, as shown in FIG. 1 , an arc-extinguishing chamber 11 is also arranged in the casing 1 , and the end of the arc-striking sheet 923 away from the bimetallic sheet 921 is arranged in the arc-extinguishing chamber 11 to guide the arc into the arc-extinguishing chamber. 11 to extinguish the arc. A plurality of exhaust guide pieces 12 on one side of the arc extinguishing chamber 11, and an air guide channel 120 is formed between the plurality of exhaust guide plates 12, and the gas generated after the arc extinguishing of the arc extinguishing chamber 11 is discharged 120 through the air guide channel.

To sum up, the contact support member in the circuit breaker provided by the present invention includes a body portion, a driving portion, and an elastic energy storage portion, and the elastic energy storage portion is connected to the movable contact. When the handle rotates over-travel, the handle drives the main body to continue to rotate through the connecting rod and the driving part, and at this time, the movable contact has been abutted and limited by the static contact. The relative movement between the body part and the moving contact causes a displacement difference between the two ends of the elastic energy storage part, and the elastic energy storage part bends and generates a rebound force directed to the static contact, which presses the moving contact against the static contact. on the head. When the static contact wears, burns, or electric repulsion, etc., the elastic deformation of the elastic energy storage part recovers to compensate for the distance caused by the static contact wear, burn or electric repulsion, etc., so that the moving contact can be tightly Abutting on the static contact to ensure the reliability of closing. The circuit breaker provided by the invention can realize the reliable contact of the dynamic and static contacts without setting the contact pressure spring. The structure of the contact support is very simple. When installing, just connect the moving contact to the elastic energy storage part. The assembly is very easy, not only the assembly efficiency is high, but also the reliability and consistency after assembly are very good. . In addition, the omission of the contact pressure spring also greatly simplifies the volume of the contact support, thereby realizing the miniaturization of the circuit breaker.

Furthermore, in the circuit breaker provided by the present invention, the length of the bending deformation part on the elastic energy storage part is adjusted to be different, and the pressure exerted on the movable contact during overtravel will also be different; The length of the bending deformation part is used to realize the adjustment of the contact pressure. The adjustment of the length of the bending deformation part is very free and not limited by any space, so it can well match the circuit breakers with different contact pressure requirements, that is, it has better design versatility.

Although the present invention has been disclosed above by preferred embodiments, it is not intended to limit the present invention. Anyone who is familiar with the art can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection shall be subject to the scope of protection required by the claims.

Claims

A circuit breaker is characterized in that it comprises a housing, a contact support member, a reaction force elastic member, a moving contact, a static contact, a lock, a handle, a connecting rod and a release, wherein:

The contact supporter includes a body part, a drive part and an elastic energy storage part. The body part is rotatably connected to the housing through a pivot shaft; the drive part and the elastic energy storage part are respectively located on both sides of the pivot shaft; handle;

The moving contact is connected to the elastic energy storage part. When the handle is over-rotated, the moving contact abuts the static contact, the body part moves relative to the moving contact, and the two ends of the elastic energy storage part generate a displacement difference and bend, resulting in a pointing The resilience of the static contact to press the moving contact against the static contact.
The circuit breaker according to claim 1, wherein the movable contact and the elastic energy storage part are overlapped and connected, and the part where the elastic energy storage part and the movable contact are overlapped and connected is a resilience adjustment area, and the adjustment of the elastic energy adjustment area length to adjust the resilience.
The circuit breaker according to claim 2, wherein the contact support further comprises a connecting portion connecting the body portion and the elastic energy storage portion, the connecting portion is bent and extended relative to the body portion in the thickness direction and then connected. in the elastic energy storage unit.
The circuit breaker according to claim 1, wherein the lock is rotatably connected to the contact support and forms a linkage state or a tripping state with the driving part to lock or unlock the connecting rod connected to the handle, The lock elastic part is connected between the lock and the contact support part.
The circuit breaker according to claim 4, wherein the latch comprises a latch body, a tripping trigger portion, a hook portion and a locking portion, and the latch body is rotatably connected to the body portion of the contact support member, and the latch body is rotatably connected to the body portion of the contact support member, and the release The buckle trigger part and the hook part are respectively located on two sides of the lock body, the lock part is formed on the hook part and protrudes to the inside of the hook part, and the lock body, the hook part and the lock part form a first bayonet, which drives the There is a second bayonet on the part facing opposite to the first bayonet. In the interlocking state, the outer side wall of the locking part and the side wall of the second bayonet abut against the two sides of the other end of the connecting rod respectively and lock it. ; In the tripping state, the locking part releases the locking of the other end of the connecting rod, and the other end of the connecting rod stops in the first bayonet.
The circuit breaker according to claim 5, wherein the other end of the driving part opposite to the first bayonet has at least one groove, and the locking elastic member is sleeved and fixed between the two grooves or one of them. between the groove and the outer side wall of the drive part.
The circuit breaker according to claim 1 or 4, wherein the latch further comprises a rotation trigger part, the rotation trigger part is arranged on the trip trigger part and extends to the side where the contact holder is located, and the rotation trigger part It is located between the static contact and the elastic energy storage part.
The circuit breaker according to claim 1, wherein the release device comprises a thermal release device, the thermal release device comprises a bimetallic sheet and a trip rod, and the bottom of the bimetallic sheet abuts against the bimetallic adjustment screw, The included angle between the surface of the bimetallic sheet at the abutment and the axis of the bimetallic adjusting screw is greater than or equal to 75 degrees and less than or equal to 105 degrees.
The circuit breaker according to claim 8, wherein the bimetallic sheet includes a first part, a second part and a third part from bottom to top, the first part abuts the double gold adjusting screw, and the surface of the first part is in contact with the double metal plate. The included angle between the axes of the gold adjusting screws is greater than or equal to 75 degrees and less than or equal to 105 degrees, the second part is bent relative to the first part to the side where the static contact is located, and the third part is relatively far from the static contact relative to the second part. One side of the head is bent.
The circuit breaker according to claim 1, wherein the circuit breaker further comprises an arc-extinguishing chamber arranged in the casing and a plurality of exhaust guide pieces located on one side of the arc-extinguishing chamber, among which the plurality of exhaust guide pieces A gas guide channel is formed between the two, and the gas generated after the arc extinguishing chamber is extinguished is discharged through the gas guide channel.