CN220691951U

CN220691951U - Thermomagnetic molded case circuit breaker

Info

Publication number: CN220691951U
Application number: CN202321947819.XU
Authority: CN
Inventors: 叶盛; 杨加明; 潘可杰
Original assignee: Ningbo Laibao Intelligent Electric Technology Co ltd
Current assignee: Ningbo Laibao Intelligent Electric Technology Co ltd
Priority date: 2023-07-24
Filing date: 2023-07-24
Publication date: 2024-03-29
Anticipated expiration: 2033-07-24

Abstract

The utility model provides a thermo-magnetic molded case circuit breaker, comprising: the circuit breaker body is also provided with an operation switch, a first wiring terminal and a second wiring terminal; the thermomagnetic tripping structure comprises a tripping mechanism, an electromagnetic coil and a double-layer metal sheet, wherein after the current transmitted by a first wiring end received by the electromagnetic coil is overloaded, the traction rod is magnetically attracted to enable the tripping mechanism to control an operation switch to be closed or the double-layer metal sheet to receive overload current to deform, so that the tripping mechanism controls the operation switch to be closed; the arc extinguishing structure is connected with the first wiring end and comprises an arc extinguishing chamber, a protection layer and arc extinguishing grid sheets, wherein the protection layer can be detached and arranged on the surface of the arc extinguishing chamber, and the arc extinguishing grid sheets can be detached and arranged in the arc extinguishing chamber. The plastic structure of the circuit breaker is safer, the protection layer can reduce the damage of the arc to the arc extinguishing chamber, the manual disassembly and replacement process is omitted, the use cost is reduced, and the service life of the whole structure of the circuit breaker is prolonged.

Description

Thermomagnetic molded case circuit breaker

Technical Field

The utility model relates to the technical field of circuit breakers, in particular to a thermo-magnetic molded case circuit breaker.

Background

A circuit breaker refers to a switching device capable of closing, carrying and opening a current under normal circuit conditions, and capable of closing, carrying and opening a current under abnormal circuit conditions (including short circuit conditions) for a prescribed period of time. The circuit breaker can be used for distributing electric energy, starting the asynchronous motor infrequently, protecting a power line, the motor and the like, and automatically cutting off the circuit when serious overload or short circuit, undervoltage and other faults occur, and the functions of the circuit breaker are equivalent to the combination of a fuse type switch, an over-under-heating relay and the like.

In the prior art, the switch can generate an arc in the opening and closing process, and an arc extinguishing device is arranged in the circuit breaker in order to prevent the circuit breaker from being damaged by high temperature and instantaneous high voltage generated by the arc. But in long-time use, the explosion chamber can be under high temperature effect internal surface coking, influences explosion chamber arc extinguishing effect, and the electric arc of the inside production of circuit breaker has certain potential safety hazard, also can lead to the fact the damage to other structures in the circuit breaker, needs in time to handle, and conventional means can only be manual disassembly the back, handle focusing structure or change the explosion chamber, and the cost is higher, can waste more time.

Disclosure of Invention

The utility model aims to at least solve one of the problems that an arc-extinguishing chamber in the prior art can be coked, other structures in a circuit breaker can be damaged due to potential safety hazards, manual treatment or replacement is complex, time is wasted and cost is high, and provides a device which can not damage the arc-extinguishing chamber by an electric arc, is easy to replace the arc-extinguishing chamber by people, has low cost and saves time.

Therefore, the utility model provides a thermo-magnetic molded case circuit breaker.

The utility model provides a thermo-magnetic molded case circuit breaker, comprising:

the circuit breaker comprises a circuit breaker body, wherein the circuit breaker body is also provided with an operation switch, a first wiring terminal and a second wiring terminal;

the thermomagnetic tripping structure comprises a tripping mechanism, an electromagnetic coil and a double-layer metal sheet, wherein after the current transmitted by the first wiring terminal and received by the electromagnetic coil is overloaded, the traction rod is magnetically attracted to enable the tripping mechanism to control the operation switch to be closed or enable the double-layer metal sheet to receive the overload current to deform, so that the tripping mechanism controls the operation switch to be closed; the arc extinguishing structure is connected with the first wiring terminal and comprises an arc extinguishing chamber, a protection layer and an arc extinguishing grid sheet, wherein the protection layer is detachably arranged on the surface of the arc extinguishing chamber, and the arc extinguishing grid sheet is detachably arranged in the arc extinguishing chamber.

The utility model provides a thermo-magnetic molded case circuit breaker, comprising: the circuit breaker comprises a circuit breaker body, a thermomagnetic tripping structure and an arc extinguishing structure. The circuit breaker body is plastic construction, and operating switch part structure is located the circuit breaker outside, and other structures are connected with the shedding mechanism, and operating switch can supply personnel to push and pull, and the structure that contacts with the staff is insulating material. The first wiring terminal and the second wiring terminal are provided with copper wires to be connected with the circuit, and the first wiring terminal and the second wiring terminal can be of metal rod structures and are arranged on two sides inside the circuit breaker body. The tripping mechanism comprises a tripping device and a prying plate arranged on one side of the double-layer metal sheet, and a shallow groove is formed on the prying plate and can clamp the tripping device. The traction rod is arranged inside the electromagnetic coil, and when the current received by the electromagnetic coil exceeds the load, one end of the magnetic attraction traction rod pushes the prying plate to rotate for a certain angle, and the release rotates out of the shallow groove to drive the operation switch to close the circuit and break the power. The double-layer metal sheet is formed by pressing left and right of structures made of different materials, the jumping expansion coefficients of the metals made of different materials are different, and when overrun current passes through the double-layer metal sheet, the metal sheet deforms, so that one end of the prying plate is pressed, the prying plate is rotated by a certain angle, and then the release is rotated out of the shallow groove to drive the operation switch to close a circuit to cut off. The arc extinguishing structure is connected with the first wiring end through the metal sheet, when the operation switch is opened or closed, the electric arc moves to the arc extinguishing bars in the arc extinguishing chamber through the metal sheet, the number of the arc extinguishing bars is multiple groups, a certain distance is arranged in the arc extinguishing chamber at intervals, so that the electric arc is divided into a plurality of short arcs, the short arcs are cooled down to be extinguished, the damage of the electric arc to other structures of the breaker body is avoided, the protective layer can separate the electric arc from the arc extinguishing chamber, and the damage of the electric arc to arc extinguishing is reduced.

Therefore, the circuit breaker plastic structure is safer, the thermomagnetic tripping structure can protect the circuit, damage to electric equipment in the circuit is avoided, the arc extinguishing structure can extinguish the arc generated by the tripping and closing center of the switch, the protection layer can reduce the damage to the arc extinguishing cover caused by the arc, the process saving time of manual disassembly and replacement is saved, the use cost is reduced, and the service life of the whole circuit breaker structure is prolonged.

According to the technical scheme, the thermomagnetic molded case circuit breaker can also have the following additional technical characteristics:

in the above technical scheme, the number of the arc extinguishing bars is multiple, and the arc extinguishing bars are arranged in the arc extinguishing chamber at a certain distance from each other.

In this technical scheme, the arc extinguishing bars piece can be steel sheet, copper sheet or be nickel copper sheet, and each other the distance can cut apart the electric arc into multistage short arc and radiating effect is better, can be convenient for the extinction of electric arc, avoids electric arc to cause the damage to circuit breaker inner structure, improves the holistic life of circuit breaker, reduce cost.

In the above technical scheme, the explosion chamber inner wall be equipped with the mounting groove with the arc extinguishing bars piece is connected, the mounting groove quantity is the multiunit, and certain distance each other sets up on the explosion chamber inner wall.

In this technical scheme, mounting groove and arc extinguishing bars piece detachable connection, the mounting groove quantity is the multiunit to be established on the inner wall of arc extinguishing chamber both sides relative position, and arc extinguishing bars piece accessible slides and follow mounting groove one side and take out, is convenient for maintain or change the arc extinguishing bars piece of damage.

In the above technical scheme, the arc-extinguishing cover is further provided with a fixing piece which can fix the arc-extinguishing grid sheet and the mounting groove into a whole.

In this technical scheme, the arc extinguishing bars piece is equipped with the mounting hole and can be connected with the mounting, and the mounting is established in the mounting groove, establishes at least at the mounting groove both ends in order to improve the coupling strength of arc extinguishing bars piece and mounting groove, even under extremely abominable operational environment such as vibration or high temperature, the arc extinguishing bars piece also can not drop, avoids the electric arc to cause the damage to circuit breaker inner structure.

In the above technical scheme, the thermomagnetic trip structure is further provided with a moving contact, and the first wiring terminal is connected with or separated from the moving contact after the operation switch is turned on or off.

In the technical scheme, the movable contact is a metal connecting sheet or a rod structure and is coupled or separated from a first wiring terminal, the first wiring terminal is connected with a circuit through the metal structure, current moves to a thermomagnetic tripping structure through the first wiring terminal, and after the current exceeds a load, the electromagnetic coil magnetic attraction traction rod drives the tripping mechanism to move, and the tripping switch is operated to be closed, so that the first wiring terminal is separated from the movable contact to realize outage, and the circuit is protected.

In the above technical scheme, the protection layer is provided with a slot, so that the mounting slot is positioned in the slot after the protection layer is coupled with the arc extinguishing chamber.

In this technical scheme, the fluting size is slightly greater than the mounting groove size to make both coupling back mounting groove be located the mounting groove and can not cause the influence to the structure in the mounting groove, the quantity of fluting and the quantity adaptation of mounting groove, the mounting groove still can be the spout structure.

In the above technical scheme, the inner surface of the arc-extinguishing chamber is provided with a plurality of groups of connecting pieces so as to fix the arc-extinguishing chamber and the protection layer into a whole.

In the technical scheme, the connecting piece can be of a rubber structure or other structures with certain toughness, the protective layer is provided with through holes for the connecting piece to be coupled through the rubber structure or other structures, and the connecting piece is at least arranged at four corners of the corresponding positions of the arc extinguishing cover and the protective layer so as to improve the coupling strength of the arc extinguishing cover and the protective layer.

In any of the above technical solutions, the protective layer is made of asbestos cement.

In the technical scheme, the asbestos cement has excellent high temperature resistance and insulativity, can reduce the damage of an electric arc to a protective layer, has a good protective effect on the arc-extinguishing chamber, reduces the maintenance and replacement cost of the arc-extinguishing chamber, and also saves the time of manual maintenance and replacement.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a sectional view of a thermo-magnetic molded case circuit breaker of the present utility model;

FIG. 2 is a schematic diagram of the connection of an arc chute and an arc chute sheet of the thermo-magnetic molded case circuit breaker of the present utility model;

fig. 3 is a schematic diagram of an arc chute and a protective layer of the thermo-magnetic molded case circuit breaker of the present utility model.

The correspondence between the reference numerals and the component names in fig. 1 to 3 is:

1. a circuit breaker body; 101. an operation switch; 102. a first terminal; 103. a second terminal; 2. a thermo-magnetic trip structure; 201. a trip mechanism; 202. an electromagnetic coil; 203. a double layer metal sheet; 204. a traction rod; 205. a moving contact; 3. an arc extinguishing structure; 301. an arc extinguishing cover; 302. a protective layer; 303. arc extinguishing grid plates; 304. a mounting groove; 305. a fixing member; 306. slotting; 307. and a connecting piece.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced otherwise than as described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.

A thermo-magnetic molded case circuit breaker provided according to some embodiments of the present utility model is described below with reference to fig. 1 to 3.

Some embodiments of the present application provide a thermo-magnetic molded case circuit breaker.

As shown in fig. 1 to 3, a first embodiment of the present utility model provides a thermo-magnetic molded case circuit breaker, comprising:

the circuit breaker comprises a circuit breaker body 1, wherein the circuit breaker body 1 is also provided with an operation switch 101, a first wiring terminal 102 and a second wiring terminal 103; the thermomagnetic tripping structure 2 comprises a tripping mechanism 201, an electromagnetic coil 202 and a double-layer metal sheet 203, wherein after the current transmitted by the first wiring terminal 102 and received by the electromagnetic coil 202 is overloaded, the traction rod 204 is magnetically attracted to enable the tripping mechanism 201 to control the operation switch 101 to be closed or the double-layer metal sheet 203 to receive the overload current and deform, so that the tripping mechanism 201 controls the operation switch 101 to be closed; the arc extinguishing structure 3, arc extinguishing structure 3 with first wiring end 102 is connected, including arc extinguishing chamber 301, protective layer 302 and arc extinguishing bars piece 303, protective layer 302 can dismantle and establish the arc extinguishing chamber 301 surface, arc extinguishing bars piece 303 can dismantle and establish in the arc extinguishing chamber 301.

The utility model provides a thermo-magnetic molded case circuit breaker, comprising: the circuit breaker comprises a circuit breaker body 1, a thermomagnetic tripping structure 2 and an arc extinguishing structure 3. The breaker body 1 is of a plastic structure, part of the structure of the operation switch 101 is positioned at the outer side of the breaker, the other structures are connected with the shedding mechanism, the operation switch 101 can be pushed and pulled by personnel, and the structure contacted with the personnel is made of insulating materials. The first terminal 102 and the second terminal 103 are provided with copper wires connected with the circuit, and the first terminal 103 and the second terminal 103 can be in a metal rod structure and arranged on two sides of the inside of the breaker body 1. The tripping mechanism 201 comprises a tripper and a prying plate arranged on one side of the double-layer metal sheet 203, wherein a shallow groove is formed on the prying plate and can clamp the tripper. The traction rod 204 is arranged inside the electromagnetic coil 202, when the current received by the electromagnetic coil 202 exceeds the load, one end of the magnetic traction rod 204 pushes the prying plate to rotate for a certain angle, and the release rotates out of the shallow groove to drive the operation switch 101 to close the circuit and cut off. The double-layer metal sheet 203 is formed by pressing left and right of structures made of different materials, the jumping expansion coefficients of the metals made of different materials are different, and when overrun current passes through the double-layer metal sheet 203, the metal sheet deforms, so that one end of the prying plate is pressed, the prying plate is rotated by a certain angle, and then the release is rotated out of the shallow groove to drive the operation switch 101 to close a circuit to cut off. The arc extinguishing structure 3 is connected with the first wiring terminal 102 through the sheetmetal, when the operation switch 101 is opened or closed, the electric arc moves to the arc extinguishing bars 303 in the arc extinguishing chamber 301 through the sheetmetal, the quantity of the arc extinguishing bars 303 is multiple groups, a certain distance is arranged in the arc extinguishing chamber 301 at intervals, so that the electric arc is divided into a plurality of short arcs, the electric arc is cooled down to be extinguished, other structures of the breaker body 1 are prevented from being damaged by the electric arc, the protective layer 302 can separate the electric arc from the arc extinguishing chamber 301, and damage to arc extinction caused by the electric arc is reduced.

Therefore, the circuit breaker plastic structure is safer, the thermomagnetic tripping structure 2 can protect the circuit, damage to electric equipment in the circuit is avoided, the arc extinguishing structure 3 can extinguish the arc generated by the tripping and closing center of the switch, the protection layer 302 can reduce the damage to the arc extinguishing cover 301 caused by the arc, save time in the manual disassembly and replacement process, reduce the use cost and prolong the service life of the whole circuit breaker structure.

The second embodiment of the present utility model provides a thermo-magnetic molded case circuit breaker, and on the basis of the first embodiment, as shown in fig. 2, the number of the arc extinguishing bars 303 is multiple, and they are disposed in the arc extinguishing chamber 301 at a certain distance from each other.

In this embodiment, the arc extinguishing bars 303 may be steel sheets, copper sheets or nickel copper sheets, and the distance between the two arc extinguishing bars may divide the arc into multiple sections of short arcs, so as to achieve better heat dissipation effect, facilitate the extinction of the arc, avoid the damage of the arc to the inner structure of the circuit breaker, improve the service life of the circuit breaker, and reduce the cost.

The third embodiment of the present utility model provides a thermo-magnetic molded case circuit breaker, and on the basis of any of the above embodiments, as shown in fig. 2, the inner wall of the arc-extinguishing chamber 301 is provided with a mounting groove 304 connected with the arc-extinguishing gate 303, and the number of the mounting grooves 304 is multiple, and the mounting grooves 304 are arranged on the inner wall of the arc-extinguishing chamber 301 at a certain distance from each other.

In this embodiment, the installation grooves 304 are detachably connected with the arc-extinguishing bars 303, the number of the installation grooves 304 is multiple, and the arc-extinguishing bars 303 can be pulled out from one side of the installation grooves 304 by sliding, so that the damaged arc-extinguishing bars 303 can be maintained or replaced conveniently.

In a fourth embodiment of the present utility model, a thermo-magnetic molded case circuit breaker is provided, and on the basis of any of the above embodiments, as shown in fig. 2, the arc extinguishing chamber 301 is further provided with a fixing member 305 for fixing the arc extinguishing gate 303 and the mounting groove 304 as a whole.

In this embodiment, the arc extinguishing grid 303 is provided with a mounting hole and can be connected with the fixing piece 305, the fixing piece 305 is arranged in the mounting groove 304, and at least the two ends of the mounting groove 304 are arranged to improve the coupling strength of the arc extinguishing grid 303 and the mounting groove, so that the arc extinguishing grid 303 can not fall off even under extremely severe working environments such as vibration or high temperature, and the damage of the arc to the internal structure of the circuit breaker is avoided.

The fifth embodiment of the present utility model proposes a thermo-magnetic molded case circuit breaker, and on the basis of any of the above embodiments, as shown in fig. 1, the thermo-magnetic trip structure 2 is further provided with a moving contact 205, and when the operation switch 101 is turned on or off, the first terminal 102 is connected to or separated from the moving contact 205.

In this embodiment, the moving contact 205 is a metal tab or a rod structure and is coupled to or separated from the first terminal 102, the first terminal 102 is electrically connected to a circuit, current moves to the thermomagnetic trip structure 2 through the first terminal 102, and when the current exceeds a load, the electromagnetic coil 202 magnetically attracts the traction rod 204 to drive the trip mechanism 201 to move, and the operating switch 101 trips and closes, so that the first terminal 102 is separated from the moving contact 205 to realize power failure, thereby protecting the circuit.

In a sixth embodiment of the present utility model, a thermo-magnetic molded case circuit breaker is provided, and on the basis of any of the above embodiments, as shown in fig. 3, the protection layer 302 is provided with a slot 306, so that the mounting slot 304 is located in the slot 306 after the protection layer 302 is coupled with the arc extinguishing chamber 301.

In this embodiment, the size of the slots 306 is slightly larger than that of the mounting slots 304, so that the mounting slots 304 are located in the mounting slots 304 after the slots are coupled without affecting the structure in the mounting slots 304, the number of the slots 306 is adapted to the number of the mounting slots 304, and the mounting slots 304 can be a chute structure.

A seventh embodiment of the present utility model provides a thermo-magnetic molded case circuit breaker, and on the basis of any of the above embodiments, as shown in fig. 3, a plurality of groups of connection members 307 are disposed on an inner surface of the arc extinguishing chamber 301 to fix the arc extinguishing chamber 301 and the protection layer 302 as a whole.

In this embodiment, the connecting member 307 may be a rubber structure or other structure with a certain toughness, the protection layer 302 is provided with a through hole for the connecting member 307 to be coupled through, and the connecting member 307 is at least provided at four corners of the arc extinguishing chamber 301 corresponding to the protection layer 302, so as to improve the coupling strength of the two.

An eighth embodiment of the present utility model provides a thermo-magnetic molded case circuit breaker, and on the basis of any of the above embodiments, as shown in fig. 1 to 3, the protection layer 302 is made of asbestos cement.

In this embodiment, the asbestos cement has excellent high temperature resistance and insulation, so that the damage of the arc to the protective layer 302 can be reduced, a better protective effect is achieved on the arc-extinguishing chamber 301, the maintenance and replacement cost of the arc-extinguishing chamber 301 is reduced, and the time for manual maintenance and replacement is also saved.

In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A thermo-magnetic molded case circuit breaker, comprising:

the circuit breaker comprises a circuit breaker body (1), wherein the circuit breaker body (1) is also provided with an operation switch (101), a first wiring terminal (102) and a second wiring terminal (103);

the thermomagnetic tripping structure (2), the thermomagnetic tripping structure (2) comprises a tripping mechanism (201), an electromagnetic coil (202), a double-layer metal sheet (203) and a traction rod (204), wherein after the current transmitted by the first wiring terminal (102) and received by the electromagnetic coil (202) is overloaded, the traction rod (204) is magnetically attracted to enable the tripping mechanism (201) to control the operation switch (101) to be closed or the double-layer metal sheet (203) to receive the overload current to deform, so that the tripping mechanism (201) controls the operation switch (101) to be closed;

the arc extinguishing structure (3), arc extinguishing structure (3) with first wiring end (102) are connected, including arc extinguishing chamber (301), protective layer (302) and arc extinguishing bars piece (303), protective layer (302) can dismantle and establish arc extinguishing chamber (301) surface, arc extinguishing bars piece (303) can dismantle and establish in arc extinguishing chamber (301).

2. The thermo-magnetic molded case circuit breaker according to claim 1, wherein the number of the arc extinguishing bars (303) is plural, and are disposed in the arc extinguishing chamber (301) at a distance from each other.

3. The thermomagnetic molded case circuit breaker according to claim 2, wherein the inner wall of the arc-extinguishing chamber (301) is provided with a plurality of mounting grooves (304) connected with the arc-extinguishing gate (303), and the number of the mounting grooves (304) is plural, and the mounting grooves are arranged on the inner wall of the arc-extinguishing chamber (301) at a certain distance from each other.

4. A thermo-magnetic molded case circuit breaker according to claim 3, wherein the arc-extinguishing chamber (301) is further provided with a fixing member (305) for fixing the arc-extinguishing gate (303) and the mounting groove (304) as a unit.

5. The thermo-magnetic molded case circuit breaker according to claim 1, wherein the thermo-magnetic trip structure (2) is further provided with a moving contact (205), and the first terminal (102) is connected to or separated from the moving contact (205) when the operation switch (101) is turned on or off.

6. The thermo-magnetic molded case circuit breaker according to claim 4, wherein the protection layer (302) is provided with a slot (306) such that the mounting slot (304) is located in the slot (306) after the protection layer (302) is coupled with the arc chute (301).

7. The thermo-magnetic molded case circuit breaker according to claim 1, wherein the inner surface of the arc extinguishing chamber (301) is provided with a plurality of sets of connection members (307) to fix the arc extinguishing chamber (301) and the protection layer (302) as one body.

8. The thermo-magnetic molded case circuit breaker according to claim 1, wherein the protective layer (302) is an asbestos cement material.