CN217009098U

CN217009098U - Circuit breaker

Info

Publication number: CN217009098U
Application number: CN202123451953.4U
Authority: CN
Inventors: 魏首勋
Original assignee: Shenzhen Mantunsci Technology Co ltd
Current assignee: Shenzhen Mantunsci Technology Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-07-19
Anticipated expiration: 2031-12-31

Abstract

The utility model discloses a circuit breaker, which comprises a circuit breaker main body, a switch assembly and a short-circuit protection mechanism, wherein the switch assembly is arranged in the circuit breaker main body; the short-circuit protection mechanism is arranged in the circuit breaker main body and comprises a magnetic yoke, current-carrying pieces, a movable iron core, a transmission mechanism and a fixed support, wherein the movable iron core is arranged in the transmission mechanism, the transmission mechanism and the fixed support are connected with a torsional spring, the transmission mechanism is provided with an ejector pin, and the magnetic yoke is electrically connected with the current-carrying pieces; when the magnetic yoke passes through the short-circuit fault current, the movable iron core is electromagnetically adsorbed by the magnetic yoke to drive the thimble to impact the switch assembly, so that the switch assembly is switched off. According to the technical scheme, the movable iron core is attracted by the electromagnetic force generated by the magnetic yoke, overcomes the tension of the torsion spring, and is attracted by the magnetic yoke, so that the short circuit protection of the circuit breaker is realized, the structure is simple, the production process is simple, the volume is reduced, and the space utilization rate of the circuit breaker is optimized.

Description

Circuit breaker

Technical Field

The utility model relates to the technical field of electricity, in particular to a circuit breaker.

Background

A short circuit protection mechanism is generally provided in the circuit breaker, and when a current passing through the circuit breaker increases to a certain value, an electromagnetic trip rapidly trips the circuit breaker, thereby achieving a circuit protection function.

The existing circuit breaker generally adopts a short circuit coil mode, a driving piece is arranged in the short circuit coil, and when the current flowing through the short circuit coil is larger than a protection current threshold value, enough electromagnetic force can be generated to drive the driving piece to act so as to control the switch component of the circuit breaker to be switched off, and short circuit protection is realized. However, the short-circuit coil is surrounded by one circle of lead, which is complex in structure, large in volume and complex in production process.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a circuit breaker, and aims to solve the problems of complex structure, complex production process and large volume of a short-circuit coil in the circuit breaker.

To achieve the above object, the present invention provides a circuit breaker, including:

a circuit breaker main body;

the switch assembly is arranged in the breaker main body;

the short-circuit protection mechanism is arranged in the circuit breaker main body and comprises a magnetic yoke, a current-carrying piece, a movable iron core, a transmission mechanism and a fixed support, wherein the movable iron core is arranged in the transmission mechanism, the transmission mechanism and the fixed support are connected with a torsional spring, the transmission mechanism is provided with an ejector pin, and the magnetic yoke is electrically connected with the current-carrying piece;

when the magnetic yoke passes through the short-circuit fault current, the movable iron core is electromagnetically adsorbed by the magnetic yoke to drive the thimble to impact the switch assembly, so that the switch assembly is switched off.

In one embodiment, the yoke is U-shaped and the current carrying blades pass through the slots of the yoke.

In one embodiment, the transmission mechanism is provided with a rotating shaft, the fixing bracket is provided with two rotating shaft holes corresponding to the rotating shaft, and the rotating shaft is rotatably arranged in the two rotating shaft holes.

In one embodiment, the fixing support is provided with an ejector pin hole, and the ejector pin is telescopically arranged in the ejector pin hole.

In one embodiment, a protrusion is arranged at the lower end of the transmission mechanism, and a gap exists between the protrusion and the current-carrying sheet.

In an embodiment, one surface of the protrusion facing the current-carrying sheet is an arc surface.

In one embodiment, the switch assembly is provided with a movable contact and a fixed contact, the movable contact and the fixed contact are arranged oppositely, and the movable contact can move between a switching-on position and a switching-off position;

when the switch component is in the switching-on position, the movable contact is in contact with the fixed contact;

when the switch assembly is in the opening position, the movable contact is separated from the fixed contact.

In one embodiment, the circuit breaker body includes a first terminal connected to the movable contact and a second terminal connected to the stationary contact through the current-carrying piece.

In one embodiment, the torsion spring is disposed at the periphery of the rotating shaft, and two ends of the torsion spring are respectively connected to the fixing bracket and the transmission mechanism.

In one embodiment, the current carrying tabs are made of a conductive material.

According to the technical scheme, the magnetic yoke generates electromagnetic force to drive the movable iron core, the movable iron core overcomes the tension of the torsion spring and is attracted with the magnetic yoke, short circuit protection of the circuit breaker can be achieved, the structure is simple, the production process is simple, the size is reduced, and the space utilization rate of the circuit breaker is optimized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

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

fig. 2 is a schematic structural diagram of a short-circuit protection mechanism of an embodiment of the circuit breaker of the present invention;

fig. 3 is a schematic structural diagram of a part of a short-circuit protection mechanism of an embodiment of the circuit breaker of the present invention;

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

fig. 5 is a partially enlarged view of fig. 1.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Breaker main body	110	First terminal
200	Switch assembly	120	Second terminal
				300	Short-circuit protection mechanism	331	Rotating shaft
310	Movable iron core	332	Projection
				320	Magnetic yoke	351	Rotating shaft hole
330	Transmission mechanism	210	Movable contact
				340	Thimble	220	Static contact
350	Fixing support	333	Torsion spring
				360	Current-carrying sheet

The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used for explaining the relative position relationship between the components, the motion situation, and the like under a certain posture (as shown in the drawing), and if the certain posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "A and/or B" as an example, including either the A aspect, or the B aspect, or both A and B satisfied aspects. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1 to 5, the present invention provides a circuit breaker, which includes a circuit breaker main body 100, a switch assembly 200 and a short-circuit protection mechanism 300, wherein the switch assembly 200 is disposed in the circuit breaker main body 100; the short-circuit protection mechanism 300 is disposed in the circuit breaker main body 100, the short-circuit protection mechanism 300 includes a magnetic yoke 320, a current-carrying sheet 360, a movable iron core 310, a transmission mechanism 330 and a fixed bracket 350, the movable iron core 310 is mounted on the transmission mechanism, the transmission mechanism 330 and the fixed bracket 350 are connected with a torsion spring 333, the transmission mechanism 330 is provided with an ejector pin 340, and the magnetic yoke 320 is electrically connected with the current-carrying sheet 360; when the magnetic yoke 320 passes through the short-circuit fault current, the movable iron core 310 is electromagnetically attracted by the magnetic yoke 320, and drives the thimble 340 to impact the switch assembly 200, so that the switch assembly 200 is opened.

Specifically, the circuit breaker body 100 includes various components including, but not limited to, an arc extinguishing mechanism, power terminals, and the like. The switching assembly 200 serves to control the power of the breaker body 100 to be turned off and on. The magnetic yoke 320 can be fixed on the current-carrying blade 360 by welding or riveting, the movable iron core 310 can be fixed on the transmission mechanism 330 by welding or riveting, and the transmission relationship between the thimble 340 and the transmission mechanism can be welding, riveting, screwing, and the like. The movable iron core 310 may be provided in various shapes, and only the attraction force between the movable iron core 310 and the magnetic yoke 320 needs to be ensured. For example: the movable iron core 310 is rectangular. Thimble 340 may be provided in a variety of shapes, for example: the outer end of the thimble 340 is round-headed. The round end of the thimble 340 is used for striking the switch assembly 200 to realize the opening of the circuit breaker.

Referring to fig. 1, 2 and 5, in normal operation, the switch assembly 200 and the short-circuit protection mechanism 300 are in current flow, and the iron core and the magnetic yoke 320 are in a separated state; when the short-circuit fault current passes through the magnetic yoke 320, the magnetic yoke 320 can generate magnetic field energy with sufficient strength, the thimble 340 can move along with the rotation of the movable iron core 310, and when the movable iron core 310 is attracted with the magnetic yoke 320, the thimble 340 can generate impact force to impact towards the transmission mechanism 330 of the switch assembly 200, so as to realize the opening of the circuit breaker.

When the current-carrying plate 360 passes through the short-circuit fault, the magnetic yoke 320 generates strong enough electromagnetic force to attract the movable iron core 310, the movable iron core 310 overcomes the torsion of the torsion spring 333, the transmission mechanism 330 rotates until the transmission mechanism is in contact with the magnetic yoke 320, the ejector pin 340 is driven to extend forwards in the rotating process of the movable iron core 310, the short-circuit current is extremely large and disappears instantly, the ejector pin 340 has strong impact force to impact the switch assembly 200, meanwhile, the short-circuit current disappears instantly, and the movable iron core 310 resets due to the force of the torsion spring 333. So set up for switching module 200 trips to the separating brake position from the closing brake position, disconnects the power of circuit breaker main part 100, realizes the short circuit protection of circuit. The existing short-circuit protection mode of the electromagnetic coil with one circle is changed, and the short-circuit protection can be realized by attracting the movable iron core 310 by the magnetic yoke 320, so that the breaker is simpler in structure, small in processing difficulty and simplified in production and processing technology.

Referring to fig. 2, in the present embodiment, the yoke 320 has a U shape, and the current-carrying blade 360 penetrates through a groove of the yoke 320. It can be understood that the U-shaped yoke 320 surrounds the periphery of the current-carrying blade 360, so as to ensure that the magnetic field energy of the yoke 320 absorbs the movable iron core 310, and meanwhile, the current-carrying blade 360 passes through the groove of the yoke 320, thereby effectively reducing the occupied space and further saving the internal space of the circuit breaker.

Referring to fig. 2 to 4, in the present embodiment, the transmission mechanism 330 is provided with a rotation shaft 331, the fixing bracket 350 is provided with two rotation shaft holes 351351 corresponding to the rotation shaft 331, and the rotation shaft 331 is rotatably provided in the two rotation shaft holes 351351.

It can be understood that, when the short-circuit fault current passes through the magnetic yoke 320, the iron core is driven by the electromagnetic force of the magnetic yoke 320 to rotate towards the magnetic yoke 320, and the transmission mechanism 330 is driven to rotate around the rotation axis 331 in the rotation axis hole 351351 relative to the fixed bracket 350, so that the iron core and the magnetic yoke 320 are attracted, and the structure is simple and reliable and is easy to implement.

Referring to fig. 2 and fig. 5, in the present embodiment, the fixing bracket 350 is provided with a thimble 340, and the thimble 340 is telescopically disposed in the thimble 340. It can be understood that the size of the hole of the thimble 340 can be selected according to the requirement. When the iron core is attracted to the magnetic yoke 320, the thimble 340 extends out of the thimble 340 hole, and impacts the switch assembly 200, so as to realize the opening of the switch assembly 200.

In order to prevent the transmission mechanism 330 from being jammed and ensure that the transmission mechanism 330 can smoothly rotate around the rotation shaft 331, referring to fig. 3 to 4, in the present embodiment, a protrusion 332 is disposed at a lower end of the transmission mechanism 330, and a gap exists between the protrusion 332 and the current-carrying sheet 360. It should be noted that, when the switch assembly 200 of the circuit breaker is turned from the on position to the off position, the transmission mechanism 330 rotates relative to the fixing bracket 350, and the gap between the protrusion 332 and the current-carrying blade 360 can ensure the rotation, thereby improving the structural practicability.

With continued reference to fig. 3 to 4, further, the protrusion 332 is disposed in an arc shape on a surface facing the current-carrying sheet 360. So set up for drive mechanism 330 is more even in the rotation process and the clearance of current-carrying piece 360, does not receive the influence of shape corner, and then guarantees that thimble 340 can strike switch module 200 and realize the separating brake.

Referring to fig. 1 and 5, in the present embodiment, the switch assembly 200 has a movable contact 210 and a fixed contact 220, the movable contact 210 is disposed opposite to the fixed contact 220, and the movable contact 210 is movable between a closing position and an opening position; when the switch assembly 200 is in the closed position, the movable contact 210 is in contact with the stationary contact 220; when the switch assembly 200 is in the open position, the movable contact 210 is separated from the stationary contact 220.

It can be understood that the switch component 200 drives the moving contact to switch between the opening position and the closing position by rotating, the moving contact has one contact surface, the static contact has another contact surface, both contact surfaces may be a plane, one may be a plane, the other may be a curved surface, or an arc surface, and the specific details are not limited herein. When the moving contact is in the closing position, two contact surface butts make the contact between moving contact and the static contact good, and the moving contact makes the area of contact of the two big through the face contact with the static contact, makes the circuit breaker low at the in-process temperature rise of operation, and the heat dissipation is fast, and safe and reliable when the circuit breaker uses improves the reliability of circuit breaker. When the short-circuit fault current passes through the magnetic yoke 320, the movable iron core 310 attracts the magnetic yoke 320 to drive the thimble 340 to impact the switch assembly 200, and the switch assembly 200 enables the movable contact 210 to be separated from the fixed contact 220 through transmission, so that the current in the short circuit breaker is disconnected, and the short-circuit protection and opening of the circuit breaker are realized.

Referring to fig. 1, 2 and 5, in the present embodiment, the circuit breaker body includes a first terminal 110 and a second terminal 120, the first terminal 110 is connected to the movable contact 210, and the second terminal 120 is connected to the stationary contact 220 through the current-carrying blade 360.

It is understood that the first terminal 110 can be used as an input terminal of a circuit breaker, and can also be used as an output terminal of the circuit breaker, in this embodiment, the first terminal 110 is used as an input terminal of the circuit breaker for example, and then the second terminal 120 is used as an output terminal, and the switch assembly 200 is disposed between the input terminal and the output terminal. The first terminal 110, the switching assembly 200 and the second terminal 120 are electrically connected in sequence to form a main circuit, the switching assembly 200 has an open state and a closed state, and the switching assembly 200 controls power on/off of the main circuit by switching between the open state and the closed state. When the switch assembly 200 is in a closing state, the moving contact contacts with the fixed contact, and the current accessed by the first terminal 110 is output to the second terminal 120 after passing through the fixed contact and the moving contact of the switch assembly 200; when the switch assembly 200 is in the open state, the moving contact is separated from the fixed contact, so that the first terminal 110 and the second terminal 120 are disconnected.

When the short-circuit fault current passes through the fixed contact, an electromagnetic attraction force is generated between the magnetic yoke 320 and the movable iron core 310, when the electromagnetic attraction force is larger than the counter force of the torsion spring 333, the movable iron core 310 moves towards the magnetic yoke 320, the ejector pin 340 impacts the short-circuit trigger head of the switch assembly 200, so that the switch assembly 200 rotates towards the other side, the movable contact 210 is separated from the fixed contact 220, and the tripping of the circuit breaker is realized. After the circuit breaker trips, since the moving contact 210 is separated from the stationary contact 220, the current of the first terminal 110 is blocked from the current of the second terminal 120, the short-circuit fault current is cut off, the electromagnetic force between the yoke 320 and the moving core 310 disappears, and the moving core 310 is reset by the restoring force of the torsion spring 333.

The structure changes the traditional short circuit coil form, the attraction can be realized through the matching of the magnetic yoke 320 and the movable iron core 310, the structure of the short circuit protection mechanism 300 is relatively simple, the structure is simplified, the simplicity of process production is further ensured, and the occupied space is small.

In order to reset the movable iron core 310, referring to fig. 3, in this embodiment, the torsion spring 333 is disposed on the outer circumference of the rotating shaft 331, and two ends of the torsion spring are respectively connected to the fixing bracket 350 and the transmission mechanism 330. It can be understood that the fixing bracket 350 is fixed, and the end of the torsion spring 333 connected to the fixing bracket 350 is also fixed, so that when the transmission mechanism 330 rotates, the torsion spring 333 deforms, and the transmission mechanism 330 is pulled by the deformation of the torsion spring 333, so that the transmission mechanism 330 drives the movable iron core 310 to reset. Since the short-circuit fault current disappears after a strong current is instantaneously generated, after the attraction between the movable iron core 310 and the magnetic yoke 320 is finished, the electromagnetic force disappears, and the torsion spring 333 acts in the direction of the reset of the transmission mechanism 330 to drive the movable iron core 310 to reset.

To ensure that there is an electrical current passing between the first terminal 110 and the second terminal 120, the current tab 360 is made of an electrically conductive material in this embodiment. The conductive material may be silver, copper, aluminum, etc., and only needs to ensure that the current passes through the yoke 320 to generate electromagnetic force to attract the movable iron core 310, thereby realizing short circuit protection of the circuit breaker.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the technical solutions of the present invention that are made by using the contents of the specification and the drawings or directly/indirectly applied to other related technical fields are included in the scope of the present invention.

Claims

1. A circuit breaker, comprising

A circuit breaker main body;

the switch assembly is arranged in the breaker main body;

2. The circuit breaker of claim 1, wherein the yoke is U-shaped, and the current carrying blades pass through slots in the yoke.

3. The circuit breaker according to claim 2, wherein the transmission mechanism is provided with a rotation shaft, the fixing bracket is provided with two rotation shaft holes corresponding to the rotation shaft, and the rotation shaft is rotatably provided in the two rotation shaft holes.

4. The circuit breaker of claim 3, wherein the fixed support defines an ejection pin aperture, and wherein the ejection pin is telescopically disposed within the ejection pin aperture.

5. The circuit breaker of claim 4, wherein the lower end of the transmission mechanism is provided with a protrusion, and the protrusion has a gap with the current-carrying piece.

6. The circuit breaker of claim 5, wherein a surface of the protrusion facing the current carrying blade is curved.

7. The circuit breaker of claim 6, wherein the switch assembly has a movable contact and a stationary contact, the movable contact being disposed opposite the stationary contact, the movable contact being movable between an on position and an off position;

when the switch assembly is in the switching-on position, the movable contact is in contact with the fixed contact;

8. The circuit breaker of claim 7, wherein the circuit breaker body includes a first terminal and a second terminal, the first terminal being connected to the movable contact, the second terminal being connected to the stationary contact by the current carrying blade.

9. The circuit breaker according to claim 3, wherein the torsion spring is disposed on an outer circumference of the rotating shaft, and both ends of the torsion spring are connected to the fixing bracket and the transmission mechanism, respectively.

10. The circuit breaker of claim 1, wherein the current carrying blades are made of a conductive material.