阅读说明：本技术 一种断路器合闸电阻脱扣机构及断路器 (Circuit breaker closing resistor tripping mechanism and circuit breaker ) 是由 韩峰 张敬涛 卢鹏旭 姚灿江 王鹏超 魏建巍 郭良超 杨珂 王文博 朱秋楠 于 2019-09-26 设计创作，主要内容包括：本发明涉及过负荷保护短路开关技术领域,特别涉及一种断路器合闸电阻脱扣机构及断路器。该断路器合闸电阻脱扣机构包括外壳体、电阻静触头、电阻静触头复位弹簧、电阻动触头、电阻动触头复位弹簧、拉杆和锁止装置；电阻动触头导向移动装配在外壳体内,拉杆插装在电阻动触头后端部并可相对电阻动触头导向移动,锁止装置安装在拉杆内部,包括锁舌和锁舌弹簧,锁舌在锁舌弹簧的弹性力作用下能够伸出拉杆并与电阻动触头的后端面挡止配合,锁舌上设有朝向前侧的斜面；抵压件设于外壳体内,与锁舌上的斜面配合将锁舌向前的运动转化为收向拉杆内部的运动；该断路器合闸电阻脱扣机构能够方便的实现合闸电阻的脱扣。(The invention relates to the technical field of overload protection short-circuit switches, in particular to a circuit breaker closing resistor tripping mechanism and a circuit breaker. The circuit breaker closing resistance tripping mechanism comprises an outer shell, a resistance static contact reset spring, a resistance moving contact reset spring, a pull rod and a locking device; the resistance moving contact is assembled in the outer shell in a guiding mode, the pull rod is inserted in the rear end portion of the resistance moving contact and can move in a guiding mode relative to the resistance moving contact, the locking device is installed in the pull rod and comprises a lock tongue and a lock tongue spring, the lock tongue can extend out of the pull rod under the elastic force action of the lock tongue spring and is in blocking fit with the rear end face of the resistance moving contact, and the lock tongue is provided with an inclined face facing the front side; the pressing piece is arranged in the outer shell and is matched with the inclined plane on the lock tongue to convert the forward movement of the lock tongue into the movement towards the interior of the pull rod; the tripping mechanism of the circuit breaker closing resistor can conveniently realize tripping of the closing resistor.)

1. The utility model provides a circuit breaker closing resistor tripping device which characterized by includes:

an outer housing;

a resistor static contact;

the reset spring of the fixed resistance contact is connected with the fixed resistance contact and used for resetting the fixed resistance contact;

the resistance moving contact is movably assembled in the outer shell in a guiding way, and the rear end part of the resistance moving contact is provided with an accommodating cavity for inserting the pull rod;

the resistance moving contact reset spring is arranged between the resistance moving contact and the outer shell and used for resetting the resistance moving contact when the resistance moving contact is opened;

the pull rod is inserted into the accommodating cavity at the rear end part of the resistance moving contact and can move in the accommodating cavity in a guiding manner, and one end of the pull rod, which is far away from the resistance moving contact, is used for being in transmission connection with an operating mechanism in the circuit breaker;

the locking device is arranged in the pull rod and comprises a lock tongue and a lock tongue spring, the lock tongue can extend out of the pull rod under the action of elastic force of the lock tongue spring and is in blocking fit with the rear end face of the resistance moving contact, so that the resistance moving contact is driven by the pull rod to move forwards together, the lock tongue is provided with an inclined plane facing to the front side, and the edge of the inclined plane facing to the inside of the pull rod is defined as a bottom edge;

the pressing piece is arranged in the outer shell and is matched with the inclined plane on the lock tongue to convert the forward movement of the lock tongue into the movement of the interior of the retracting pull rod;

when the pressing piece presses the end part of the spring bolt facing the outer side of the pull rod, the bottom edge of the upper inclined plane of the spring bolt is positioned on the inner side of the inner wall surface of the accommodating cavity of the resistance moving contact, so that the rear end surface of the resistance moving contact can convert the forward movement of the spring bolt into the movement of retracting the spring bolt through the inclined plane of the spring bolt.

2. The circuit breaker closing resistor tripping mechanism of claim 1, wherein more than two locking tongues are provided in the locking device, and all the locking tongues are coplanar and uniformly arranged.

3. The circuit breaker closing resistance tripping mechanism of claim 2, wherein two locking tongues are provided in the locking device, and two ends of the locking tongue spring are respectively connected and fixed with the two locking tongues.

4. The circuit breaker closing resistor tripping mechanism of claim 1, 2 or 3, wherein the part of the pressing piece contacting with the lock tongue is provided with a pressing piece inclined surface, and the pressing piece inclined surface is attached to the inclined surface on the lock tongue when the pressing piece contacts with the lock tongue.

5. The circuit breaker closing resistor tripping mechanism of claim 1, 2 or 3, wherein the pressing member is a plate-shaped structure extending from the outer housing towards the inner side.

6. The circuit breaker closing resistor tripping mechanism of claim 4, wherein the pressing member is a plate-like structure extending from the outer housing toward the inside.

7. The circuit breaker closing resistor tripping mechanism of claim 1, 2 or 3, wherein the locking device comprises a lock housing, and the latch spring are disposed in the lock housing.

8. The circuit breaker closing resistor tripping mechanism of claim 4, wherein the locking mechanism comprises a lock housing, and the locking bolt spring are disposed within the lock housing.

9. The circuit breaker closing resistor tripping mechanism of claim 5, wherein the locking mechanism comprises a lock housing, and wherein the locking bolt and the locking bolt spring are disposed within the lock housing.

10. A circuit breaker, comprising:

a moving contact of the arc extinguish chamber;

an arc extinguish chamber fixed contact;

an operating mechanism;

a closing resistor;

a circuit breaker closing resistor tripping mechanism, said circuit breaker closing resistor tripping mechanism being the circuit breaker closing resistor tripping mechanism described in claims 1-9.

Technical Field

The invention relates to the technical field of overload protection short-circuit switches, in particular to a circuit breaker closing resistor tripping mechanism and a circuit breaker.

Background

In a high-voltage power grid, when a breaker closes a no-load long line, particularly when the breaker closes a line under the condition that the amplitude of a power supply voltage is opposite to the residual voltage of the line, large overvoltage can be caused by the oscillation of electromagnetic energy on the power grid due to the sudden change of line parameters, and the power grid system can be greatly damaged by the overvoltage; in order to prevent the occurrence of switching-on overvoltage, a breaker is generally required to be connected with a switching-on resistor in parallel, the switching-on resistor needs to be switched on before a contact of an arc extinguish chamber is switched on, and the switching-off resistor is switched off after the contact of the arc extinguish chamber is switched on so as to consume energy in a power grid; in actual production, a tripping mechanism is usually adopted to control automatic opening of the closing resistor, so that the closing resistor is powered off.

Disclosure of Invention

The invention aims to provide a tripping mechanism of a closing resistor of a circuit breaker; the invention also aims to provide a circuit breaker.

In order to achieve the purpose, the circuit breaker closing resistance tripping mechanism provided by the invention adopts the following technical scheme:

this circuit breaker closing resistor tripping device includes:

an outer housing;

a resistor static contact;

the reset spring of the fixed resistance contact is connected with the fixed resistance contact and used for resetting the fixed resistance contact;

the resistance moving contact is movably assembled in the outer shell in a guiding way, and the rear end part of the resistance moving contact is provided with an accommodating cavity for inserting the pull rod;

the resistance moving contact reset spring is arranged between the resistance moving contact and the outer shell and used for resetting the resistance moving contact when the resistance moving contact is opened;

the pull rod is inserted into the accommodating cavity at the rear end part of the resistance moving contact and can move in the accommodating cavity in a guiding manner, and one end of the pull rod, which is far away from the resistance moving contact, is used for being in transmission connection with an operating mechanism in the circuit breaker;

the locking device is arranged in the pull rod and comprises a lock tongue and a lock tongue spring, the lock tongue can extend out of the pull rod under the action of elastic force of the lock tongue spring and is in blocking fit with the rear end face of the resistance moving contact, so that the resistance moving contact is driven by the pull rod to move forwards together, the lock tongue is provided with an inclined plane facing to the front side, and the edge of the inclined plane facing to the inside of the pull rod is defined as a bottom edge;

the pressing piece is arranged in the outer shell and is matched with the inclined plane on the lock tongue to convert the forward movement of the lock tongue into the movement of the interior of the retracting pull rod;

when the pressing piece presses the end part of the spring bolt facing the outer side of the pull rod, the bottom edge of the upper inclined plane of the spring bolt is positioned on the inner side of the inner wall surface of the accommodating cavity of the resistance moving contact, so that the rear end surface of the resistance moving contact can convert the forward movement of the spring bolt into the movement of retracting the spring bolt through the inclined plane of the spring bolt.

The circuit breaker closing resistor tripping mechanism provided by the invention has the beneficial effects that: the pull rod of the circuit breaker closing resistance tripping mechanism is inserted in the containing cavity at the rear end part of the resistance moving contact and can move in the containing cavity in a guiding way, the resistance moving contact and the pull rod are also blocked by a lock tongue on a locking device, the pull rod is in transmission connection with an operating mechanism in the circuit breaker, when the operating mechanism in the circuit breaker operates the moving contact of an arc extinguish chamber to close, the pull rod moves forwards along with the operating mechanism and simultaneously drives the resistance moving contact to move forwards, after the pull rod and the resistance moving contact move for a certain distance, the resistance moving contact and the resistance static contact are closed, then the pull rod and the resistance moving contact push the resistance static contact to continue moving forwards, when the lock tongue on the pull rod moves to the position of a pressing part in an outer shell, the lock tongue is pressed by the pressing part to move towards the inside of the pull rod and the resistance moving contact, and then the resistance moving contact moves backwards under the action of a return spring, therefore, tripping of the closing resistor is realized.

Furthermore, the spring bolts in the locking device are more than two, and all the spring bolts are coplanar and evenly distributed. The arrangement is that the transmission of the pull rod and the resistance moving contact is stable.

Furthermore, the number of the lock tongues in the locking device is two, and two ends of the lock tongue spring are respectively connected and fixed with the two lock tongues. The setting like this, satisfying under the pull rod passes the balanced condition of power to the resistance moving contact, can simplify locking device's structure, reduce the manufacturing degree of difficulty.

Furthermore, the part of the pressing piece, which is in contact with the lock tongue, is provided with a pressing piece inclined surface, and the pressing piece inclined surface is attached to the inclined surface on the lock tongue when the pressing piece is in contact with the lock tongue. The pressing piece can be prevented from damaging the inclined surface when pressing the inclined surface of the lock tongue, and the lock tongue is prevented from being clamped with the pressing piece.

Further, the pressing piece is a plate-shaped structure extending from the outer shell towards the inner side. The pressing member thus provided is simple in structure, and can omit the operation of fixing the pressing member to the outer case, as compared with the case in which the pressing member is provided separately.

Furthermore, locking means is including the lock shell, and spring bolt and spring setting are in the lock shell. The arrangement is that the lock tongue and the lock tongue spring can be arranged in the lock shell firstly, and then the lock tongue and the lock tongue spring are arranged in the pull rod together, so that the locking device is convenient to install.

The circuit breaker provided by the invention adopts the following technical scheme:

this circuit breaker includes explosion chamber moving contact, explosion chamber static contact, operating mechanism, closing resistor and circuit breaker closing resistor tripping device, and circuit breaker closing resistor tripping device includes:

an outer housing;

a resistor static contact;

the reset spring of the fixed resistance contact is connected with the fixed resistance contact and used for resetting the fixed resistance contact;

the resistance moving contact is movably assembled in the outer shell in a guiding way, and the rear end part of the resistance moving contact is provided with an accommodating cavity for inserting the pull rod;

the resistance moving contact reset spring is arranged between the resistance moving contact and the outer shell and used for resetting the resistance moving contact when the resistance moving contact is opened;

the pull rod is inserted into the accommodating cavity at the rear end part of the resistance moving contact and can move in the accommodating cavity in a guiding manner, and one end of the pull rod, which is far away from the resistance moving contact, is used for being in transmission connection with an operating mechanism in the circuit breaker;

the locking device is arranged in the pull rod and comprises a lock tongue and a lock tongue spring, the lock tongue can extend out of the pull rod under the action of elastic force of the lock tongue spring and is in blocking fit with the rear end face of the resistance moving contact, so that the resistance moving contact is driven by the pull rod to move forwards together, the lock tongue is provided with an inclined plane facing to the front side, and the edge of the inclined plane facing to the inside of the pull rod is defined as a bottom edge;

the pressing piece is arranged in the outer shell and is matched with the inclined plane on the lock tongue to convert the forward movement of the lock tongue into the movement of the interior of the retracting pull rod;

when the pressing piece presses the end part of the spring bolt facing the outer side of the pull rod, the bottom edge of the upper inclined plane of the spring bolt is positioned on the inner side of the inner wall surface of the accommodating cavity of the resistance moving contact, so that the rear end surface of the resistance moving contact can convert the forward movement of the spring bolt into the movement of retracting the spring bolt through the inclined plane of the spring bolt.

The circuit breaker provided by the invention has the beneficial effects that: a pull rod in a circuit breaker closing resistance tripping mechanism in the circuit breaker is inserted in a containing cavity at the rear end part of a resistance moving contact and can move in the containing cavity in a guiding manner, the resistance moving contact and the pull rod are also blocked by a lock tongue on a locking device, the pull rod is in transmission connection with an operating mechanism in the circuit breaker, when the operating mechanism in the circuit breaker operates the switching-on action of a moving contact of an arc extinguish chamber, the pull rod moves forwards along with the operating mechanism and simultaneously drives the resistance moving contact to move forwards, after the pull rod and the resistance moving contact move for a certain distance, the resistance moving contact and a resistance static contact are pushed by the pull rod and the resistance moving contact to continue moving forwards, when the lock tongue on the pull rod moves to the abutting position of a pressing part in an outer shell, the lock tongue is pressed by the abutting part to move towards the inside of the pull rod, so that the blocking of the pull rod and the resistance moving contact is released, and at the moment, therefore, tripping of the closing resistor is realized.

Furthermore, the spring bolts in the locking device are more than two, and all the spring bolts are coplanar and evenly distributed. The arrangement is that the transmission of the pull rod and the resistance moving contact is stable.

Furthermore, the number of the lock tongues in the locking device is two, and two ends of the lock tongue spring are respectively connected and fixed with the two lock tongues. The setting like this, satisfying under the pull rod passes the balanced condition of power to the resistance moving contact, can simplify locking device's structure, reduce the manufacturing degree of difficulty.

Furthermore, the part of the pressing piece, which is in contact with the lock tongue, is provided with a pressing piece inclined surface, and the pressing piece inclined surface is attached to the inclined surface on the lock tongue when the pressing piece is in contact with the lock tongue. The pressing piece can be prevented from damaging the inclined surface when pressing the inclined surface of the lock tongue, and the lock tongue is prevented from being clamped with the pressing piece.

Further, the pressing piece is a plate-shaped structure extending from the outer shell towards the inner side. The pressing member thus provided is simple in structure, and can omit the operation of fixing the pressing member to the outer case, as compared with the case in which the pressing member is provided separately.

Furthermore, locking means is including the lock shell, and spring bolt and spring setting are in the lock shell. The arrangement is that the lock tongue and the lock tongue spring can be arranged in the lock shell firstly, and then the lock tongue and the lock tongue spring are arranged in the pull rod together, so that the locking device is convenient to install.

Drawings

Fig. 1 is a use state diagram of a tripping mechanism in an embodiment of a circuit breaker closing resistor tripping mechanism provided by the invention when a closing resistor is opened (at this time, a moving contact of an arc extinguish chamber is in an open state);

fig. 2 is a diagram of a tripping mechanism in an embodiment of a circuit breaker closing resistance tripping mechanism provided by the invention, in a use state when a closing resistance is closed;

fig. 3 is a use state diagram of the tripping mechanism in the embodiment of the circuit breaker closing resistor tripping mechanism provided by the invention when the closing resistor is opened (at this time, the movable contact of the arc extinguish chamber is in a closing state);

fig. 4 is a schematic structural diagram of an embodiment of a circuit breaker provided by the present invention;

fig. 5 is a schematic diagram of the transmission of an embodiment of the circuit breaker provided by the present invention.

In the drawings: 1-outer shell, 2-resistance moving contact, 3-pull rod, 4-spring bolt, 5-resistance moving contact return spring, 6-pressing piece, 7-spring mounting seat, 8-spring bolt, 9-limiting plate, 10-stopping structure, 11-inward turning edge, 12-resistance static contact, 13-resistance static contact return spring, 101-arc extinguish chamber, 102-closing resistance structure, 103-operating mechanism, 104-insulating pull rod, 105-arc extinguish chamber transmission connecting lever, 106-resistance transmission rod, 107-resistance transmission connecting lever, 108-resistance moving contact, 109-resistance static contact, 110-arc extinguish chamber transmission rod, 111-arc extinguish chamber moving contact and 112-arc extinguish chamber static contact.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

The embodiment of the tripping mechanism of the closing resistor of the circuit breaker provided by the invention comprises the following steps:

as shown in fig. 1-3, the circuit breaker closing resistor tripping mechanism includes an outer casing 1, the outer casing 1 is a cylindrical structure, a resistor moving contact 2 is movably assembled in the outer casing 1, the resistor moving contact 2 is a cylindrical structure, an inward turning edge 11 is provided at an end of the outer casing 1 close to a resistor static contact 12, an opening matched with the outer diameter of the resistance moving contact 2 is arranged on the inward turning edge 11 to limit and guide the resistance moving contact 2, two symmetrically arranged press parts 6 are further arranged in the outer shell 1, the two press parts 6 are defined to be respectively arranged at the upper part and the lower part of the shell 1, the press parts 6 are of plate-shaped structures which extend inwards from the outer shell 1 and extend for a certain length along the left-right direction, and the distance between the two press parts 6 is the same as the outer diameter of the resistance moving contact 2, so that the two press parts 6 limit the resistance moving contact 2 in the up-down direction; the end part of the resistance moving contact 2 far away from the resistance static contact 12 is arranged in an open way.

As shown in fig. 1-3, a spring mounting seat 7 is disposed on the resistive moving contact 2, a resistive moving contact return spring 5 is sleeved on the resistive moving contact 2, and two ends of the resistive moving contact return spring 5 are respectively fixed on the spring mounting seat 7 and the inverted edge 11.

As shown in fig. 1-3, the circuit breaker closing resistor tripping mechanism further includes a pull rod 3, the pull rod 3 is a cylindrical structure, an outer diameter of the pull rod 3 is the same as an inner diameter of the resistor moving contact 2, so that the pull rod 3 can be inserted into an inner cavity of the resistor moving contact 2, and the inner cavity of the resistor moving contact 2 forms an accommodating cavity for guiding the pull rod 3 to move; one end of the pull rod 3, which is far away from the resistance moving contact 2, is in transmission connection with an operating mechanism in the circuit breaker and can move in the front-back direction under the control of the operating mechanism.

As shown in fig. 1-3, two through holes are formed in the cylinder wall of the pull rod 3 near the middle part, the two through holes are arranged oppositely, one is upward and the other is downward, a stop member is respectively arranged in each through hole in a penetrating manner, the stop member comprises a bolt 4 inserted into the through hole and a stop structure 10 positioned in the cylinder body of the pull rod 3, the bolt 4 and the stop structure 10 are integrally formed, the bolt 4 is a cylindrical structure matched with the size of the through hole, the stop structure 10 is a plate-shaped structure matched with the shape of the inner wall of the cylinder body, and the size of the stop structure 10 is larger than that of the through hole so as to limit the bolt 4 from separating from the pull rod 3 from the; a spring bolt spring 8 is arranged between the two stopping structures 10, two ends of the spring bolt spring 8 are respectively fixed with the two stopping structures 10, mounting grooves for mounting the spring bolt spring 8 are formed in the opposite surfaces of the two stopping structures 10, the spring bolt spring 8 is mounted in the mounting grooves, and the spring bolt spring 8 is always in a compressed state so as to push the two stopping structures 10 to be tightly pressed on the cylinder wall of the pull rod 3 when the spring bolt 4 is not subjected to the external acting force of the pull rod 3; a limiting plate 9 is respectively arranged at the front side and the rear side of each of the two stop structures 10, the two limiting plates 9 are fixedly connected through a fixing rod (not shown in the figure), the distance between the limiting plates 9 in the front-rear direction is the same as the size of the two stop structures 10 in the front-rear direction, and the limiting plates 9 are used for guiding and limiting the stop structures 10 when the stop structures 10 move in the up-down direction; the limiting plates 9, the spring bolts 8 and the stopping pieces form a locking device in the tripping mechanism of the closing resistor of the circuit breaker, and the two limiting plates 9 and the fixing rods thereof form a lock shell; when the locking structure is installed, firstly, the two stopping pieces and the spring 8 are placed between the two limit plates 9, and then the whole body is installed into the pull rod 3 from one end of the pull rod 3.

As shown in fig. 1-3, two inclined planes are symmetrically arranged at the end of the bolt 4, one inclined plane faces forward and the other inclined plane faces backward, the inclined plane facing forward is defined as a front inclined plane, and the edge of the front inclined plane, which is close to the stop structure 10, is a bottom edge; when the spring bolt 4 is not acted by the external force of the pull rod 3, the stopping piece is pushed by the spring bolt spring 8, the stopping structure 10 is attached to the inner wall of the cylinder body of the pull rod, the spring bolt 4 extends out of the through hole, and the front side of the spring bolt 4 is attached to the rear end face of the resistance moving contact 2; the length and gradient of the front inclined plane need to ensure that the bottom edge of the stop structure 10 is positioned at the outer side of the inner wall surface of the cylinder of the resistance moving contact 2 at the corresponding position when the stop structure is tightly attached to the inner wall of the cylinder of the pull rod 3, so that the lock tongue 4 can be stopped with the rear end surface of the resistance moving contact 2, and meanwhile, the top of the front inclined plane is positioned at the outer side of the outer wall surface of the cylinder of the resistance moving contact 2 at the corresponding position; and when the top of the front inclined plane is flush with the outer wall surface of the cylinder of the resistance moving contact 2, the bottom edge of the front inclined plane is positioned at the inner side of the inner wall surface of the cylinder of the resistance moving contact 2 at the corresponding position.

The rear side of the end of two press parts 6 on the outer shell 1 is provided with a press part inclined plane which has the same inclination angle with the front inclined plane on the lock tongue, and the purpose of setting the press part inclined plane is as follows: in the process that the pull rod 3 moves forward, the pressing piece 6 can press the spring bolt 4 to convert the forward movement of the spring bolt 4 into the movement towards the inside of the pull rod 3, the pressing piece inclined surface is arranged to prevent the pressing piece 6 from damaging the front inclined surface on the spring bolt 4, and the situation that the pressing piece 6 is blocked by the spring bolt 4 is prevented.

When the circuit breaker closing resistor tripping mechanism is used, the following processes are adopted:

1) initially, the lock tongue 4 on the pull rod 3 extends out of the pull rod 3, the lock tongue 4 is stopped with the rear end face of the resistance moving contact 2, at this time, the pull rod 3 is controlled by an operating mechanism in the circuit breaker to move forward and drive the resistance moving contact 2 to move forward, meanwhile, the arc extinguishing moving contact is also controlled by the operating mechanism to move forward, at this time, the arc extinguishing moving contact and the arc extinguishing static contact are in an open state, and the resistance moving contact 2 and the resistance static contact 12 are in an open state.

2) Under the control of the operating mechanism, the resistance moving contact 2 is firstly contacted with the resistance fixed contact 12, at the moment, the arc extinguish chamber moving contact and the arc extinguish chamber fixed contact are still in a brake separating state, then the pull rod 3 continues to move forward under the control of the operating mechanism, the resistance fixed contact 12 moves forward along with the resistance moving contact 2, the resistance fixed contact reset spring 13 is compressed, and meanwhile, the arc extinguish moving contact also moves forward under the control of the operating mechanism.

3) In the process of continuously moving the pull rod 3 forwards, when the lock tongue 4 starts to contact with the pressing part 6, along with the continuous forward movement of the pull rod 3, the lock tongue 4 can be pressed towards the inside of the cylinder of the pull rod 3 by the pressing part 6, when the lock tongue 4 passes through the position of the pressing part 6, the bottom edge of the front inclined plane on the lock tongue 4 is positioned at the inner side of the inner wall surface of the cylinder corresponding to the resistance moving contact 2, along with the continuous forward movement of the pull rod 3, the lock tongue 4 can be continuously pressed towards the inner cavity of the pull rod 3 by the rear end surface of the cylinder of the resistance moving contact 2, at the moment, the stop of the pull rod 3 and the resistance moving contact 2 is released, the tripping work is realized, and.

4) With the stopping of the pull rod 3 and the resistance moving contact 2 released, the resistance moving contact 2 moves backwards under the action of the resistance static contact return spring 13 and the resistance moving contact return spring 5, in the moving process, the resistance moving contact 2 and the resistance static contact 12 are separated, and finally the resistance moving contact 2 returns to the initial position; in the process, the operating mechanism drives the pull rod 3 and the arc extinguish chamber moving contact to move forwards continuously until the final arc extinguish chamber moving contact switching-on position is reached.

5) When the moving contact and the fixed contact of the arc extinguish chamber need to be opened, the moving contact of the arc extinguish chamber and the pull rod 3 move backwards under the control of the operating mechanism, the moving contact of the arc extinguish chamber is opened, and the pull rod 3 returns to the initial position.

In the above embodiment, the rear side of the end of the pressing member is provided with a pressing member inclined surface having the same inclination angle as the front inclined surface on the lock tongue. In other embodiments, the pressing member slope may not be provided, and the same may be used.

In the above embodiment, two lock tongues are provided. In other embodiments, the spring bolt also can set up one or more, can use equally, when setting up a plurality ofly, should guarantee that a plurality of spring bolts coplane and evenly arrange.

In the above embodiment, the outer housing, the resistive moving contact and the pull rod are all cylindrical structures. In other embodiments, the three parts can also be in a square cylinder structure and can also be used.

In the above embodiment, two pressing members are provided, and each pressing member is a plate-shaped structure extending inward from the outer shell and extending a certain length in the left-right direction. In other embodiments, the pressing element may also be of other structures, such as a plate-shaped structure extending from the outer shell inward and surrounding the outer shell circumferentially, and this type of pressing element makes it unnecessary to ensure that the lock tongue corresponds to the pressing element before the pull rod is installed.

In the above embodiment, the pressing member is formed of a plate-like structure extending inward of the outer case. In other embodiments, the pressing member may be a separate plate member, and then fixed to the outer case at a corresponding position by welding.

In the above embodiments, two ends of the spring bolt are respectively connected to the stopping structures of the two stopping members. In other embodiments, a partition plate may be fixed between the two stoppers, two lock tongue springs are respectively disposed on two sides of the partition plate, and each lock tongue is pressed on the inner wall of the cylinder of the pull rod through a separate lock tongue spring.

In the above embodiment, the locking device includes a lock housing, and the stopper is disposed in the lock housing. In other embodiments, the locking mechanism may not include a housing, but only the locking member and the deadbolt spring, and may be used as well.

The embodiment of the circuit breaker provided by the invention comprises the following components:

as shown in fig. 4 and 5, the circuit breaker includes an arc extinguish chamber 101, a closing resistor structure 102 and an operating mechanism 103, wherein an arc extinguish chamber moving contact 111 and an arc extinguish chamber moving contact 112 are disposed in the arc extinguish chamber 101, the closing resistor structure 102 includes a circuit breaker closing resistor tripping mechanism and a closing resistor (not shown in the figure), and the circuit breaker closing resistor tripping mechanism includes a resistor moving contact 108 and a resistor fixed contact 109; the arc extinguish chamber moving contact 111 and the arc extinguish chamber static contact 112 are main contacts of the circuit breaker, and the resistance moving contact 108 and the resistance static contact 109 are contacts for realizing the power-on and power-off of the closing resistor; the specific structure of the circuit breaker closing resistance tripping mechanism is the same as that of the circuit breaker closing resistance tripping mechanism in the above embodiment, and a description thereof is omitted.

As shown in fig. 5, the operating mechanism 103 includes an insulating pull rod 104, the insulating pull rod 104 is in transmission connection with an arc extinguish chamber transmission connecting lever 105, and the arc extinguish chamber transmission connecting lever 105 is in transmission connection with an arc extinguish chamber moving contact 111 through an arc extinguish chamber transmission rod 110, so as to realize the on-off of the arc extinguish chamber moving contact 111 and the arc extinguish chamber static contact 112; the arc extinguish chamber transmission connecting lever 105 is in transmission connection with the resistance transmission connecting lever 107 through the resistance transmission rod 106, the resistance transmission connecting lever 107 is in transmission connection with the resistance moving contact 108, and therefore the connection and disconnection of the resistance moving contact 108 and the resistance fixed contact 109 are achieved.