CN213691925U

CN213691925U - Circuit breaker voltage isolation structure

Info

Publication number: CN213691925U
Application number: CN202022252686.7U
Authority: CN
Inventors: 吴昊; 韦尚靖; 徐永富; 沈高强; 高治; 王阅; 翟毅; 王志超; 吴越; 刘亚南; 周峰
Original assignee: Shanghai Chint Intelligent Technology Co Ltd
Current assignee: Shanghai Chint Intelligent Technology Co Ltd
Priority date: 2020-10-12
Filing date: 2020-10-12
Publication date: 2021-07-13
Anticipated expiration: 2030-10-12

Abstract

The utility model discloses a circuit breaker voltage isolation structure, including circuit board, support, push pedal, electrically conductive piece and knob pole, the support mounting is on the circuit board, and the push pedal is slidably mounted on the support, and electrically conductive piece is installed on the push pedal and can switch on circuit board and external circuit, the knob pole rotates to be installed on the circuit board, and the knob pole has the cam, the cam has the top abutting surface that is located the top; when the cam top abutting surface is not contacted with the push plate, the circuit board is not communicated with an external circuit; and when the knob rod is rotated to push the push plate to slide on the bracket and the cam is rotated to abut against the push plate, the conductive piece on the push plate moves to conduct the circuit board and an external circuit along with the push plate. The utility model provides a circuit breaker voltage isolation structure can break off or connect external circuit and circuit board fast, accurately, and it is good to switch on the synchronism, and the safety in utilization is high.

Description

Circuit breaker voltage isolation structure

Technical Field

The utility model relates to a low-voltage apparatus technical field, concretely relates to circuit breaker voltage isolation structure.

Background

With the requirement of rapid development of the country, particularly, national-level construction projects such as intelligent manufacturing, intelligent transformer areas and new capital construction are developed successively. The existing low-voltage circuit breakers tend to develop towards an intelligent type or an electronic type, and a part of low-voltage circuit breakers need to realize a real-time measurement function on parameters such as current, voltage, power, frequency and the like, so that circuit boards are arranged in the low-voltage circuit breakers more or less. The working voltage of the circuit board can be obtained from an external circuit, and the working voltage can be calculated and identified by adopting signals supplied to the circuit board from the external circuit during real-time measurement.

The low-voltage circuit breaker needs to be subjected to a voltage withstanding test so as to detect the insulating property of the circuit breaker. However, when a voltage withstand test is performed, manufacturers need to cut off the circuit board and the external circuit in the low-voltage circuit breaker, so that the components in the circuit board can be prevented from being damaged during the voltage withstand test. For the withstand voltage test project, two common processing modes of manufacturers are as follows: firstly, it can not carry out withstand voltage test to make clear the sign on the circuit breaker face covers, and secondly the producer sets up corresponding interface in low voltage circuit breaker, need pull out the interface before withstand voltage test and break off the connection of external circuit and circuit board, inserts again after withstand voltage test finishes. Above two kinds of modes all have great drawback, and the mode is first can't detect the insulating properties of circuit breaker, and mode two is complex operation, and need dismantle the face lid of circuit breaker get off, not very safe and reliable again.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide one kind can break off or connect external circuit and circuit board fast, accurately, it is good to switch on the synchronism, the high circuit breaker voltage isolation structure of safety in utilization.

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

a circuit breaker voltage isolation structure comprises a circuit board, a support, a push plate, a conductive piece and a knob rod, wherein the support is installed on the circuit board, the push plate is installed on the support in a sliding mode, the conductive piece is installed on the push plate and can conduct the circuit board and an external circuit, the knob rod is installed on the circuit board in a rotating mode, the knob rod is provided with a cam, and the cam is provided with a top abutting surface located at the top end;

when the cam top abutting surface of the knob rod is not contacted with the push plate, the circuit board is not communicated with an external circuit; the knob rod is rotated, the cam of the knob rod pushes the push plate to slide on the bracket, and when the knob rod is rotated to abut against the cam top of the knob rod and the push plate, the conductive piece on the push plate moves along with the push plate to conduct the circuit board and an external circuit.

Preferably, the connector further comprises two contact pins, wherein one contact pin is electrically connected with an external circuit, the other contact pin is electrically connected with the circuit board, and the two contact pins are respectively installed on the circuit board and correspond to the conductive parts;

the conductive piece is a torsion spring which is provided with two pins and is used for being correspondingly connected with the two contact pins one by one; the push plate is provided with a mounting column and a limiting block, the torsion spring is sleeved on the mounting column, and pins at two ends of the torsion spring are respectively abutted to the limiting block.

Preferably, the push plate mechanism further comprises a return spring, the return spring is abutted between the support and one end of the push plate, and the knob rod is limited between the other end of the push plate and the abutting side wall of the support under the elastic force of the return spring.

Preferably, the support is of a cover structure covering and buckling on the circuit board, the support comprises a mounting top wall, two limiting side walls arranged oppositely and a resisting side wall opposite to the mounting inlet, a mounting cavity is defined by the mounting top wall, the two limiting side walls and the resisting side wall, and the push plate is located in the mounting cavity and is slidably mounted on the mounting top wall of the support; the circuit breaker is characterized in that a mounting hole is formed in the mounting top wall of the support, one end, provided with a cam, of the knob rod extends into the mounting cavity and is located between the push plate and the blocking side wall of the support, and the other end of the knob rod penetrates through the mounting hole and extends out of the circuit breaker.

Preferably, all be equipped with spacing arch on the spacing lateral wall, the spacing protruding symmetry of two spacing lateral walls to form the spout with installation roof looks interval, the push pedal has the slip arch that is located both sides, the slip arch card of push pedal is gone into in the spout and can be followed the spout and slided.

Preferably, a return spring is arranged between the support and the push plate, a first semicircular groove is formed in the mounting top wall of the support, a resisting bulge is arranged at one end of the first semicircular groove, and a resisting side face is arranged at the other end of the first semicircular groove; the push plate is provided with an avoidance groove and a second semicircular groove which are communicated, and the second semicircular groove is deeper than the avoidance groove to form a resisting step; the reset spring is arranged in the first semicircular groove of the support and the second semicircular groove of the push plate, one end of the reset spring is abutted to the abutting protrusion of the support, and the other end of the reset spring is abutted to the abutting step of the push plate.

Preferably, the bottom of support is equipped with buckle and fixed axle, be equipped with on the circuit board with buckle complex fixed logical groove, with fixed axle complex fixed orifices.

Preferably, the knob rod is provided with a rotating shaft at the bottom end, the circuit board is provided with a rotating shaft hole matched with the rotating shaft, and the knob rod is rotatably installed in the rotating shaft hole of the circuit board through the rotating shaft on the knob rod.

Preferably, the device further comprises six contact pins and a mounting plate, wherein the six contact pins are arranged on the mounting plate in two rows and three columns, two contact pins in each column are one group, and three groups of contact pins are formed; the number of the conductive pieces is three, each conductive piece corresponds to one group of contact pins, a single conductive piece is used for conducting two contact pins of a single group, one contact pin in the single group of contact pins is electrically connected with an external circuit through a lead, and the other contact pin is electrically connected with an electronic element of the circuit board; a connecting column is arranged on the bottom surface of the mounting plate, and a first connecting hole matched with the connecting column is arranged on the circuit board;

the contact pin comprises a first connecting part, a second connecting part, a blocking part and a third connecting part which are sequentially connected, the outer diameter of the third connecting part is less than the outer diameter of the first connecting part and less than the outer diameter of the second connecting part and less than the outer diameter of the blocking part, the first connecting part of the contact pin can be connected with the conductive part, and the third connecting part can be electrically connected with an external circuit; the mounting plate is provided with a second connecting hole matched with the second connecting part of the contact pin, and the circuit board is provided with a third connecting hole matched with the third connecting part of the contact pin.

Preferably, the circuit breaker further comprises a mounting shell, a base, a contact assembly and an upper cover assembly, wherein the mounting shell is mounted in the base, the contact assembly is mounted on one side of the base and can be directly connected with an external circuit, the upper cover assembly is buckled on the base, and a through hole is formed in the upper cover assembly; the circuit board is arranged in the mounting groove of the mounting shell, one end of a knob rod on the circuit board penetrates through the through hole of the upper cover component, and the conductive piece is electrically connected with the contact component through a wire.

The utility model discloses a circuit breaker voltage isolation structure can break off the connection between external circuit and the circuit board through physical isolation, guarantees the security in operator's use and test process, can break off or connect external circuit and circuit board fast, accurately, and easy operation is convenient; the rotary motion is converted into a translational motion mode to push the torsion spring to be communicated with the contact pin, and the conduction synchronism is good.

In addition, the contact pin is used as a connecting port, and the connection structure of the line port is simple. The external circuit and the circuit board are connected through the torsion spring, the torsion spring can conduct the circuit and can guarantee the connection pressure through torsion, and the reliability is improved. The utility model discloses a mutually support between push pedal, knob pole and the support and realize unique jamming design, can utilize push pedal and support spacing knob pole when rotary motion reachs the regulation position.

Drawings

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

fig. 2 is an exploded view of the circuit breaker of the present invention;

fig. 3 is an exploded view of the voltage isolation structure and mounting housing of the present invention;

fig. 4 is an assembly view of the voltage isolation structure and mounting housing of the present invention;

fig. 5 is an exploded view of the circuit breaker voltage isolation structure of the present invention;

FIG. 6 is a schematic diagram illustrating a circuit board and an external circuit of the present invention in a disconnected state;

FIG. 7 is a schematic diagram illustrating a state of the circuit board in communication with an external circuit;

fig. 8 is an exploded view of the pin and mounting plate and circuit board of the present invention;

fig. 9 is an assembly view of the pin and mounting plate and circuit board of the present invention;

fig. 10 is an exploded view of the pin and mounting plate of the present invention;

fig. 11 is a schematic structural view of the pin of the present invention;

fig. 12 is an exploded view of the rotating rod and bracket of the present invention;

fig. 13 is an assembly view of the bracket, push plate and return spring of the present invention;

FIG. 14 is an assembly view of the push plate and the bracket of the present invention;

fig. 15 is a schematic structural view of the bracket of the present invention;

fig. 16 is a perspective view of the push plate and the conductive member horizontally disposed according to the present invention;

fig. 17 is a perspective view of the push plate and the conductive member vertically arranged according to the present invention;

FIG. 18 is a bottom perspective view of the push plate of the present invention;

fig. 19 is a top perspective view of the push plate of the present invention.

Detailed Description

The following describes the embodiments of the circuit breaker voltage isolation structure according to the present invention with reference to the embodiments shown in fig. 1 to 19. The circuit breaker voltage isolation structure of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1 and 2, the circuit breaker of the present invention includes a voltage isolation structure, an installation housing 7, a base 81, a contact assembly 82 and an upper cover assembly 83, the installation housing 7 is installed in the base 81, the contact assembly 82 is installed on one side of the base 81 and can be directly connected to an external circuit, the upper cover assembly 83 is covered and fastened on the base 81, and a through hole 830 is provided on the upper cover assembly 83.

As shown in fig. 3-5, the utility model discloses a circuit breaker voltage isolation structure installs in mounting groove 701 of installation casing 7, including circuit board 2, support 5, push pedal 3, reset spring 300 for the push pedal 3 that resets, electrically conductive 4, knob pole 6, contact pin 10 and the mounting panel 11 that is used for installing contact pin 10, circuit board 2 and the installation casing 7 in the mounting groove 701 looks adaptation, support 5 installs on circuit board 2, push pedal 3 slidable mounting is on support 5, electrically conductive 4 installs on push pedal 3 and can switch on circuit board 2 and external circuit. One end of the knob stem 6 passes through the through hole 830 of the upper cover member 83 for a rotating operation, the other end of the knob stem 6 is rotatably mounted on the circuit board 2, the knob stem 6 has a cam 60 thereon, and the cam 60 has a top abutting surface 602 at the top end. The pins 10 are mounted on the circuit board 2 corresponding to the conductive members 4. The conductive member 4 is a torsion spring having two pins 401 for being connected to the two pins 10 in a one-to-one correspondence, one pin 10 of the two pins 10 is electrically connected to the contact assembly 82 through the conductive wire 100, and the other pin 10 is electrically connected to the circuit board 2.

As shown in fig. 6, when the top abutting surface 602 of the cam 60 of the knob lever 6 is not in contact with the push plate 3, the circuit board 2 is not connected to an external circuit. When the knob lever 6 is rotated clockwise, the cam 60 of the knob lever 6 pushes the push plate 3 to slide leftward on the bracket 5, and when the cam 60 of the knob lever 6 abuts against the push plate 3, the conductive members 4 on the push plate 3 move leftward along with the push plate 3 until the two pins 401 of the conductive members 4 are correspondingly connected with the two pins 10 one by one, so as to achieve the purpose of conducting the circuit board 2 and the external circuit, as shown in fig. 7. When the knob lever 6 is rotated counterclockwise and the cam 60 of the knob lever 6 abuts against the surface 602 and the push plate 3 are not contacted, the push plate 3 moves rightwards without being pushed by the cam 60 of the knob lever 6 and returns to the original position, the conductive piece 4 on the push plate 3 moves rightwards along with the push plate 3, as shown in fig. 6, the pin 401 of the conductive piece 4 is disconnected with the pin 10, and at the moment, the circuit board 2 is not communicated with an external circuit. The utility model discloses a circuit breaker voltage isolation structure can break off the connection between external circuit and the circuit board through physical isolation, guarantees the security in operator's use and test process, can break off or connect external circuit and circuit board fast, accurately, and easy operation is convenient; the rotary motion is converted into a translational motion mode to push the torsion spring to be communicated with the contact pin, and the conduction synchronism is good. In addition, the contact pin is used as a connecting port, and the connection structure of the line port is simple. The external circuit and the circuit board are connected through the torsion spring, the torsion spring can conduct the circuit and can guarantee the connection pressure through torsion, and the reliability is improved.

As shown in fig. 1-2, the contact assemblies 82 are three in number and are electrically connected to the external three phase. As shown in fig. 8-10, the number of pins 10 is six, the six pins 10 are mounted on the mounting plate 11 in two rows and three columns, two pins 10 in each column are grouped into three groups, and three groups of pins 10 are in one-to-one correspondence with three groups of contact assemblies 82. The number of the conductive members 4 is three, each conductive member 4 corresponds to one group of the pins 10, a single conductive member 4 is used for conducting a single group of two pins 10, one pin 10 in the single group of pins 10 is electrically connected with the contact assembly 82 through a wire 100 to realize electrical connection with an external circuit, and the other pin 10 is electrically connected with an electronic component of the circuit board 2. Be equipped with spliced pole 111 on the bottom surface of mounting panel 11, be equipped with on circuit board 2 with spliced pole 111 complex first connecting hole 201, the spliced pole 111 cartridge of mounting panel 11 realizes mounting panel 11 fixed mounting on circuit board 2 in the first connecting hole 201 of circuit board 2.

As shown in fig. 11, the contact pin 10 of the present invention includes a first connecting portion 101, a second connecting portion 102, a blocking portion 103 and a third connecting portion 104 connected in sequence, wherein the outer diameter of the third connecting portion 104 is smaller than the outer diameter of the first connecting portion 101 and smaller than the outer diameter of the second connecting portion 102 and smaller than the outer diameter of the blocking portion 103, the first connecting portion 101 of the contact pin 10 can be electrically connected to the conductive member 4 and the circuit board 2, and the third connecting portion 104 can be electrically connected to the contact assembly 82. The mounting plate 11 is provided with a second connecting hole 112 matched with the second connecting part 102 of the pin 10, the circuit board 2 is provided with a third connecting hole 202 matched with the third connecting part 104 of the pin 10, the first connecting part 101 of the pin 10 penetrates out of the mounting plate 11, the second connecting part 102 of the pin 10 is inserted into the second connecting hole 112 of the mounting plate 11, the blocking part 103 of the pin 10 is positioned between the mounting plate 11 and the circuit board 2, and the third connecting part 104 of the pin 10 penetrates through the third connecting hole 202 of the circuit board 2 and is fixedly welded with the circuit board 2. Two pins 401 of a single conductive member 4 are connected with the first connecting part 101 of a single group of two contact pins 10, so that the single group of two contact pins 10 are connected; the third connection portion 104 of one pin 10 of the single set of pins 10 is electrically connected to the contact assembly 82 via the wires 100, and the first connection portion 101 of the other pin 10 is electrically connected to the electronic components of the circuit board 2.

As shown in fig. 3-5, the bracket 5 is an integrally formed housing structure that is fastened to the circuit board 2 at the pin 10. As shown in fig. 15, the bracket 5 includes a mounting top wall 502, two opposite limiting side walls 503, and a resisting side wall 501 opposite to the mounting entrance, a mounting cavity 500 is defined between the mounting top wall 502, the two limiting side walls 503, and the resisting side wall 501, and the push plate 3 is located in the mounting cavity 500 and slidably mounted on the mounting top wall 502 of the bracket 5. Specifically, the limiting side walls 503 are provided with limiting protrusions 504, the limiting protrusions 504 of the two limiting side walls 503 are symmetrical and form sliding grooves with intervals with the mounting top wall 502, the push plate 3 is provided with sliding protrusions 312 located on two sides, and the sliding protrusions 312 of the push plate 3 are clamped into the sliding grooves and can slide along the sliding grooves.

As shown in fig. 12, a mounting hole 510 is formed on the mounting top wall 502 of the bracket 5, one end of the knob rod 6 has a rotating shaft 61 at the bottom end and extends into the mounting cavity 500 to be located between the push plate 3 and the blocking side wall 501 of the bracket 5, and the other end of the knob rod 6 sequentially passes through the mounting hole 510 of the bracket 5 and the through hole 830 of the upper cover assembly 83 to extend out of the circuit breaker. As shown in fig. 5, the circuit board 2 is provided with a rotation shaft hole 203 fitted with the rotation shaft 61, and the knob lever 6 is rotatably mounted to the rotation shaft hole 203 of the circuit board 2 through the rotation shaft 61 thereon. As shown in fig. 17, the end of the push plate 3 has a first stopper surface 306, a second stopper surface 307, and a third stopper surface 308 which are gradually convex. As shown in fig. 12, a limit sidewall 503 of the bracket 5 is provided with a stop slope 511. The cam 60 has a side inclined surface 601 and a side plane 603 on two sides, the top abutting surface is an arc surface, the top abutting surface 602 of the cam 60 is matched with the first limiting surface 306 of the push plate 3, the side inclined surface 601 of the cam 60 is matched with the stop inclined surface 511 of the bracket 5 and the second limiting surface 307 of the push plate 3, and the side plane 603 of the cam 60 is matched with the stop side wall 501 of the bracket 5.

As shown in fig. 12, the return spring 300 is abutted between the support 5 and one end of the push plate 3, and the knob lever 6 is limited between the other end of the push plate 3 and the abutting side wall 501 of the support 5 under the elastic force of the return spring 300. When an external circuit needs to be connected, the knob rod 6 needs to be rotated, so that the side inclined surface 601 of the cam 60 of the knob rod 6 is abutted against the stop inclined surface 511 of the bracket 5, and the push plate 3 is pushed by the return spring 300, so that the first limit surface 306 of the push plate 3 is abutted against the abutting surface 602 of the cam 60, as shown in fig. 7. Therefore, two pins 401 of the torsion spring on the push plate 3 can be abutted against the two pins 10, so that the circuit board 2 is communicated with an external circuit, and the knob rod 6 can be clamped. If an external circuit is to be disconnected, the knob rod 6 is rotated in the opposite direction, so that the knob rod 6 is separated from the stop inclined plane 511 of the bracket 5 and the first limit surface 306 of the push plate 3 for limiting, the push plate 3 pushes the knob rod 6 under the action of the return spring 300, the side inclined plane 601 of the cam 60 of the knob rod 6 is abutted against the second limit surface 307, and the side plane 603 of the cam 60 of the knob rod 6 is abutted against the stop side wall 501 of the bracket 5, so that the circuit board 2 and the external circuit can be disconnected, as shown in fig. 6. The utility model discloses a mutually support between push pedal, knob pole and the support and realize unique jamming design, can utilize push pedal and support spacing knob pole when rotary motion reachs the regulation position. The utility model discloses a push pedal 3 relies on reset spring 300's elasticity to realize reseing, and push pedal 3 and knob pole 6 mounted position that can rationally design certainly also can realize that push pedal 3 relies on self gravity to reset. The utility model discloses a push pedal 3 reset mode is reliable and more stable.

As shown in fig. 15, the mounting top wall 502 of the bracket 5 is provided with a first semicircular groove 505 for accommodating the return spring 300, one end of the first semicircular groove 505 is provided with a stop protrusion 506, and the other end of the first semicircular groove 505 is provided with a stop side 507. As shown in fig. 19, the top surface of the push plate 3 is provided with an escape groove 309 for escaping from the abutting protrusion 506 and a second semi-circular groove 311 for accommodating the return spring 300, the second semi-circular groove 311 is communicated with the escape groove 309, and the second semi-circular groove 311 is deeper than the escape groove 309 to form the abutting step 310. The return spring 300 is arranged in a guide groove formed by splicing the first semicircular groove 505 of the bracket 5 and the second semicircular groove 311 of the push plate 3, one end of the return spring 300 is abutted against the abutting protrusion 506 of the bracket 5, and the other end of the return spring 300 is abutted against the abutting step 310 of the push plate 3. During installation, the push plate 3 is pushed into the installation cavity 500 from the installation inlet, and the sliding protrusion 312 of the push plate 3 is clamped into the sliding groove and can slide along the sliding groove until the third limiting surface 308 of the push plate 3 is attached to the abutting side wall 501 of the bracket 5; placing the return spring 300 into the guide groove, wherein one end of the return spring 300 is abutted against the abutting side surface 507, and the other end is abutted against the abutting protrusion 506; then, the push plate 3 is pushed to move in a direction away from the abutting side wall 501 of the bracket 5, and the push plate 3 compresses the return spring 300 by the abutting step 310, so that the installation space is left for the knob stem 6.

As shown in fig. 18, the push plate 3 is provided with a mounting column 301 and a limiting block 302 for limiting and positioning the torsion spring. As shown in fig. 16-17, the torsion spring is sleeved on the mounting post 301, the pins 401 at both ends of the torsion spring abut against the limiting block 302 respectively and extend outward to protrude out of the limiting block 302, and the protruding portions of the pins 401 correspond to the insertion pins 10. Specifically, as shown in fig. 18, one side of the stopper 302 has an obtuse-angle opening 303, the mounting post 301 is located in the opening 303 of the stopper 302 and spaced from the stopper 302, two ends of the stopper 302 are provided with abutting surfaces 304, and one of the abutting surfaces 304 is provided with a supporting protrusion 305. As shown in fig. 16-17, one pin 401 of the torsion spring abuts against the connection between one abutting surface 304 and the pushing plate 3, and the other pin 401 of the torsion spring abuts against the connection between the other abutting surface 304 and the supporting protrusion 305.

As shown in fig. 15, a buckle 509 and a fixing shaft 508 are disposed at the bottom end of the bracket 5, as shown in fig. 5, a fixing through groove 204 matched with the buckle 509 and a fixing hole 205 matched with the fixing shaft 508 are disposed on the circuit board 2, the fixing shaft 508 of the bracket 5 is clamped into the fixing hole 205 of the circuit board 2, the buckle 509 of the bracket 5 is clamped into the fixing through groove 204 of the circuit board 2, and a hook portion of the buckle 509 penetrates through the fixing through groove 204 to hook the circuit board 2. Specifically, the number of the fasteners 509 and the number of the fixed through grooves 204 are two, and the two are in one-to-one correspondence; the number of the fixing shafts 508 and the fixing holes 205 is two, and the fixing shafts correspond to the fixing holes 205 one by one. Two buckles 509 and two fixed axles 508 are distributed in four corners, two buckles 509 are arranged diagonally, and two fixed axles 508 are arranged diagonally.

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 voltage isolation structure, its characterized in that: the circuit board comprises a circuit board (2), a support (5), a push plate (3), a conductive piece (4) and a knob rod (6), wherein the support (5) is installed on the circuit board (2), the push plate (3) is installed on the support (5) in a sliding mode, the conductive piece (4) is installed on the push plate (3) and can conduct the circuit board (2) and an external circuit, the knob rod (6) is installed on the circuit board (2) in a rotating mode, the knob rod (6) is provided with a cam (60), and the cam (60) is provided with a top abutting surface (602) located at the top end;

when the top abutting surface (602) of the cam (60) of the knob lever (6) is not contacted with the push plate (3), the circuit board (2) is not communicated with an external circuit; the knob rod (6) is rotated, the push plate (3) is pushed by the cam (60) of the knob rod (6) to slide on the support (5), when the cam (60) rotated to the knob rod (6) pushes against the abutting surface (602) to abut against the push plate (3), the conductive piece (4) on the push plate (3) moves along with the push plate (3) to conduct the circuit board (2) and an external circuit.

2. The circuit breaker voltage isolation structure of claim 1, wherein: the circuit board is characterized by further comprising two contact pins (10), wherein one contact pin (10) is electrically connected with an external circuit, the other contact pin (10) is electrically connected with the circuit board (2), and the two contact pins (10) are respectively installed on the circuit board (2) and correspond to the conductive piece (4);

the conductive parts (4) are torsion springs, and the torsion springs are provided with two pins (401) which are used for being correspondingly connected with the two contact pins (10) one by one; the push plate (3) is provided with a mounting column (301) and a limiting block (302), the torsion spring is sleeved on the mounting column (301), and pins (401) at two ends of the torsion spring are respectively abutted to the limiting block (302).

3. The circuit breaker voltage isolation structure of claim 1, wherein: the push plate mechanism is characterized by further comprising a return spring (300), wherein the return spring (300) is abutted between the support (5) and one end of the push plate (3), and the knob rod (6) is limited between the other end of the push plate (3) and the resisting side wall (501) of the support (5) under the elastic force of the return spring (300).

4. The circuit breaker voltage isolation structure of claim 1, wherein: the support (5) is of a cover structure covering and buckled on the circuit board (2), the support (5) comprises a mounting top wall (502), two limiting side walls (503) which are arranged oppositely and a resisting side wall (501) which is opposite to a mounting inlet, a mounting cavity (500) is defined by the mounting top wall (502), the two limiting side walls (503) and the resisting side wall (501), and the push plate (3) is located in the mounting cavity (500) and is slidably mounted on the mounting top wall (502) of the support (5); be equipped with mounting hole (510) on the installation roof (502) of support (5), the one end that knob pole (6) had cam (60) stretches into installation cavity (500) and lies in between push pedal (3) and support (5) keep out lateral wall (501), and the other end of knob pole (6) passes mounting hole (510) and stretches out outside the circuit breaker.

5. The circuit breaker voltage isolation structure of claim 4, wherein: all be equipped with spacing arch (504) on spacing lateral wall (503), spacing arch (504) symmetry of two spacing lateral walls (503) to with installation roof (502) looks interval formation spout, push pedal (3) have the slip arch (312) that are located both sides, the slip arch (312) card of push pedal (3) is gone into in the spout and can be followed the spout and slide.

6. The circuit breaker voltage isolation structure of claim 4, wherein: a return spring (300) is arranged between the support (5) and the push plate (3), a first semicircular groove (505) is formed in a mounting top wall (502) of the support (5), a resisting protrusion (506) is arranged at one end of the first semicircular groove (505), and a resisting side surface (507) is arranged at the other end of the first semicircular groove; the push plate (3) is provided with an avoiding groove (309) and a second semi-circular groove (311) which are communicated, and the second semi-circular groove (311) is deeper than the avoiding groove (309) to form a resisting step (310); the reset spring (300) is arranged in a first semicircular groove (505) of the support (5) and a second semicircular groove (311) of the push plate (3), one end of the reset spring (300) is abutted against the abutting protrusion (506) of the support (5), and the other end of the reset spring (300) is abutted against the abutting step (310) of the push plate (3).

7. The circuit breaker voltage isolation structure of claim 1, wherein: the bottom of support (5) is equipped with buckle (509) and fixed axle (508), be equipped with on circuit board (2) with buckle (509) complex fixed logical groove (204), with fixed axle (508) complex fixed orifices (205).

8. The circuit breaker voltage isolation structure of claim 1, wherein: the knob rod (6) is provided with a rotating shaft (61) located at the bottom end, a rotating shaft hole (203) matched with the rotating shaft (61) is formed in the circuit board (2), and the knob rod (6) is rotatably installed in the rotating shaft hole (203) of the circuit board (2) through the rotating shaft (61) on the knob rod.

9. The circuit breaker voltage isolation structure of claim 1, wherein: the novel contact pin fixing structure is characterized by further comprising contact pins (10) and a mounting plate (11), wherein the number of the contact pins (10) is six, the six contact pins (10) are arranged on the mounting plate (11) in two rows and three columns, two contact pins (10) in each column are in one group, and three groups of contact pins (10) are formed; the number of the conductive pieces (4) is three, each conductive piece (4) corresponds to one group of contact pins (10), a single conductive piece (4) is used for conducting two contact pins (10) in a single group, one contact pin (10) in the single group of contact pins (10) is electrically connected with an external circuit through a lead (100), and the other contact pin (10) is electrically connected with an electronic element of the circuit board (2); a connecting column (111) is arranged on the bottom surface of the mounting plate (11), and a first connecting hole (201) matched with the connecting column (111) is arranged on the circuit board (2);

the contact pin (10) comprises a first connecting part (101), a second connecting part (102), a blocking part (103) and a third connecting part (104) which are sequentially connected, the outer diameter of the third connecting part (104) is smaller than that of the first connecting part (101) and smaller than that of the second connecting part (102) and smaller than that of the blocking part (103), the first connecting part (101) of the contact pin (10) can be connected with a conductive part (4), and the third connecting part (104) can be electrically connected with an external circuit; the mounting plate (11) is provided with a second connecting hole (112) matched with the second connecting part (102) of the contact pin (10), and the circuit board (2) is provided with a third connecting hole (202) matched with the third connecting part (104) of the contact pin (10).

10. A circuit breaker voltage isolation construction as claimed in any one of claims 1 to 9, characterized in that: the circuit breaker further comprises an installation shell (7), a base (81), a contact assembly (82) and an upper cover assembly (83), wherein the installation shell (7) is installed in the base (81), the contact assembly (82) is installed on one side of the base (81) and can be directly connected with an external circuit, the upper cover assembly (83) covers the base (81), and a through hole (830) is formed in the upper cover assembly (83); the circuit board (2) is arranged in an installation groove (701) of the installation shell (7), one end of a knob rod (6) on the circuit board (2) penetrates through a through hole (830) of the upper cover component (83), and the conductive piece (4) is electrically connected with the contact component (82) through a lead (100).