CN211350542U

CN211350542U - Magnetic tripping system of miniature circuit breaker

Info

Publication number: CN211350542U
Application number: CN201922255320.2U
Authority: CN
Inventors: 周素珍; 黄穗; 陈清槐
Original assignee: Xiamen Shanxiu Sunshine Technology Co ltd
Current assignee: Xiamen Shanxiu Sunshine Technology Co ltd
Priority date: 2019-12-16
Filing date: 2019-12-16
Publication date: 2020-08-25
Anticipated expiration: 2029-12-16

Abstract

The utility model discloses a miniature circuit breaker's magnetism system of unbuckling installs in miniature circuit breaker's casing, including terminal board, current detection subassembly and coil pack, current detection subassembly set up on terminal board, coil pack include winding coil, iron core subassembly, yoke and static contact, winding coil winding iron core subassembly peripheral, iron core subassembly set up in the yoke, the one end and the terminal board welding of winding coil, the other end and the one end of static contact are together spot welded on the yoke, make terminal board and winding coil and static contact constitute the route of electric current. The utility model discloses magnetism dropout system, terminal board and coil only a spot welding point, the sectional area of current detection subassembly is great, and the product temperature rise can satisfy the requirement, and the utility model discloses a magnetism dropout system, small in size can realize miniature circuit breaker's miniaturized requirement.

Description

Magnetic tripping system of miniature circuit breaker

Technical Field

The utility model belongs to the technical field of the circuit breaker technique and specifically relates to a miniature circuit breaker's magnetism system of unbuckling.

Background

The miniature circuit breaker, abbreviated as MCB, is a terminal protection electrical appliance which is most widely used in the power distribution device of an electrical terminal. The MCB is basically fixed in appearance, size, wiring mode and the like, is often used for the tail end of power distribution and is arranged on a plurality of branches to protect and control electric equipment. With the development and requirements of the technology of the internet of things, a current detection assembly needs to be installed on the MCB for collecting the current of the MCB, but the size of the MCB cannot be increased too much.

The publication number is: the patent of CN110444447A discloses: a miniature circuit breaker, which is provided with a current detection device and a thermomagnetic release in a shell, occupies a large useful space and is not suitable for a miniature circuit breaker in a small space.

Disclosure of Invention

An object of the utility model is to provide a miniature circuit breaker's magnetism system of unbuckling realizes installing in little space, and can pass through the temperature rise test. In order to achieve the above purpose, the utility model adopts the following technical scheme:

a magnetic tripping system of a miniature circuit breaker is installed in a shell of the miniature circuit breaker and comprises a terminal board, a current detection assembly and a coil assembly, wherein the current detection assembly is arranged on the terminal board, the coil assembly comprises a winding coil, an iron core assembly, a magnet yoke and a fixed contact, the winding coil is wound on the periphery of the iron core assembly, the iron core assembly is arranged in the magnet yoke, one end of the winding coil is welded with the terminal board, the other end of the winding coil and one end of the fixed contact are together spot-welded on the magnet yoke, and the terminal board, the winding coil and the fixed contact form a current path.

In one embodiment, the current detecting assembly is a current transformer, the terminal board is a bent plate made of a conductive material, and the current transformer passes through the terminal board and is disposed at an outer ring of the bent plate.

Preferably, the bending plate comprises a first straight section, a vertical section and a second straight section, the vertical section is connected with the first straight section and the second straight section, the first straight section is located at the edge of the shell, a vertical retaining wall is arranged in the shell, the vertical retaining wall is partially disconnected to form an accommodating space, the vertical section is arranged in the accommodating space and is arranged on the same plane with the vertical retaining wall, and the current transformer is sleeved on the outer ring of the second straight section.

Preferably, the edges of the bending plate are provided with chamfers.

In another embodiment, the current detection assembly comprises a manganin sampling resistor and two groups of current sampling ends, the manganin sampling resistor is embedded on a terminal board, the current sampling ends are arranged on two sides of the manganin sampling resistor, and the current sampling ends are connected with a circuit board of the miniature circuit breaker.

Furthermore, a voltage sampling end is further arranged on the terminal board and connected with a circuit board of the miniature circuit breaker.

Wherein, the yoke including set up in the preceding yoke piece of core subassembly front end, set up in the back yoke piece of core subassembly rear end to and the connection yoke piece of connecting preceding yoke piece and back yoke piece, preceding yoke piece on or back yoke piece on be equipped with the mounting hole that supplies core subassembly to pass.

Wherein, the iron core subassembly include the iron core sleeve pipe, install moving iron core, quiet iron core, the pressure spring and the push rod that reset in the iron core sleeve pipe, quiet iron core fix at iron core subassembly tip, quiet iron core the inner be equipped with the recess, pressure spring one end that resets install in the recess, the other end and push rod butt, push rod one end be located the iron core sleeve pipe and inherent compress the pressure spring that resets under the effect of moving the iron core, the other end passes quiet iron core and stretches out outside the iron core sleeve pipe.

The magnetic yoke further comprises a gasket made of magnetic conductive materials, wherein a clamping hole for inserting the end part of the static iron core is formed in the gasket, and the gasket is installed at the rear end of the front yoke piece.

Preferably, the rear end of the iron core sleeve is provided with a pit for rotation, the outer wall of the iron core sleeve is provided with a convex rib for being clamped and fixed on the inner side of the back yoke piece, and the mounting hole of the back yoke piece is provided with a notch groove.

Due to the adoption of the structure, the utility model discloses following beneficial effect has:

1. the utility model discloses a terminal board and winding coil spot welding only need a spot welding point, and the welding is convenient, because binding post makes platelike, it is hard conductor, and terminal board's sectional area is great, and the product temperature rise can satisfy the requirement. Set up the current detection subassembly in terminal board department, be convenient for detect current, and the space that occupies is little, the utility model discloses the whole small in size of structure can realize miniature circuit breaker's miniaturized requirement. By the structure, the shell of the miniature circuit breaker can realize a relatively symmetrical space structure design, and can realize inverted wiring.

2. The current detection assembly adopts a current transformer, the current transformer penetrates through a terminal board and is arranged on the outer ring of the current detection assembly, the current transformer is connected to a circuit board in a three-phase product, and the three phases are electrically isolated, so that the design of the circuit board is facilitated.

3. The wiring terminal board is the bending plate, and the middle part of bending plate is vertical section, and vertical section and the vertical barricade setting of casing form a part of barricade in the coplanar, but furthest's reduction wiring terminal board shared space has shortened MCB's length size as far as possible.

4. The edge of the bending plate is provided with the chamfer, so that the surface area of the plate can be increased, a magnetic circuit can be enhanced, and the current transformer can penetrate conveniently.

5. Set up the gasket and be used for fixed iron core subassembly, adorn back in the casing, can prevent that iron core subassembly from falling out, solve the technological problem of product electric welding and assembly.

Drawings

Fig. 1 is a schematic structural diagram of the first embodiment.

Fig. 2 is a schematic front view of the first embodiment.

Fig. 3 is a schematic sectional view B-B of fig. 2.

Fig. 4 is a schematic structural view of a current transformer of the embodiment mounted on the outer periphery of a terminal board.

Fig. 5 is a schematic structural diagram of the first embodiment of the present invention installed on a casing of a miniature circuit breaker, and an iron core assembly is not installed yet in the drawing.

Fig. 6 is a schematic perspective view of fig. 5.

Fig. 7 is a schematic view of fig. 3 taken in the direction C, with the current transformer hidden.

Fig. 8 is a schematic structural diagram of the second embodiment.

Description of the main symbols:

1: terminal board, 11: vertical section, 12: first straight section, 13: second straight section, 14: chamfering, 2: winding coil, 3: current transformer, 4: iron core assembly, 41: core sleeve, 411: rib, 412: pit, 42: movable iron core, 43: stationary core, 44: push rod, 45: return compression spring, 46: groove, 5: yoke, 51: front yoke piece, 52: back yoke sheet, 521: notch groove, 53: connection yoke piece, 54: mounting hole, 55: fixing hole, 6: gasket, 61: clamping hole, 7: a housing, 71: vertical retaining wall, 8: a fixed contact, 91: manganin sampling resistor 92: current sampling terminal, 93: and a voltage sampling terminal.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.

Example one

As shown in fig. 1 to 3, the present embodiment discloses a magnetic tripping system of a miniature circuit breaker, which includes a terminal board 1, a coil assembly and a current transformer 3. The coil assembly comprises a winding coil 2, an iron core assembly 4, a magnet yoke 5, a static contact 8 and a gasket 6.

The current transformer 3 passes through the terminal board 1 and is arranged at the outer ring of the terminal board 1. Winding coil 2 twines in iron core subassembly 4 periphery, and iron core subassembly 4 sets up in yoke 5. One end of the winding coil 2 is welded with the terminal board 1, and the other end is spot-welded on the magnetic yoke 5 together with one end of the static contact 8, as shown in fig. 1, a spot welding position is at a position a. Through two welding places, the terminal board 1, the winding coil 2 and the static contact 8 form a current path.

As shown in fig. 3, the terminal board 1 is a bent plate made of a conductive material. The bending plate comprises a first straight section 12, a vertical section 11 and a second straight section 13, wherein the vertical section 11 is connected with the first straight section 12 and the second straight section 13. As shown in fig. 5, a vertical retaining wall 71 is disposed in the miniature circuit breaker housing 7, the vertical retaining wall 71 is partially broken to form an accommodating space, and the vertical section 11 is disposed in the accommodating space and disposed on the same plane as the vertical retaining wall 71. The first straight section 12 is positioned at the edge of the shell 7, and the current transformer 3 is sleeved on the outer ring of the second straight section 13.

As shown in fig. 4, the edges of the folded plate are provided with chamfers 14. The current transformer 3 passes through the bent plate with the chamfer 14 and is arranged on the outer ring of the second straight section 13. The current transformer 3 is a zero sequence current transformer.

The yoke 5 includes a front yoke piece 51, a back yoke piece 52, and a connecting yoke piece 53. The front yoke piece 51 is disposed at the front end of the core assembly 4, and the front yoke piece 51 is provided with a mounting hole 54 through which the core assembly 4 passes. The back yoke piece 52 is provided at the rear end of the core assembly 4, and the connecting yoke piece 53 connects the front yoke piece 51 and the back yoke piece 52. The spacer 6 is provided with a fastening hole 61 for inserting the end of the stationary core 43, and the spacer 6 is mounted on the rear end of the front yoke piece 51. The gasket 6 is made of magnetic conductive material.

The iron core assembly 4 comprises an iron core sleeve 41, a movable iron core 42, a static iron core 43, a reset pressure spring 45 and a push rod 44 which are arranged in the iron core sleeve 41. The quiet iron core 43 is fixed at 4 tip of iron core subassembly, and quiet iron core 43 inner is equipped with recess 46, and the pressure spring 45 one end that resets is installed in recess 46, the other end and push rod 44 butt, and push rod 44 one end is located iron core sleeve 41, and the other end passes quiet iron core 43 and stretches out outside iron core sleeve 41. As shown in fig. 7 and 3, a recess 412 for rotation is provided at the rear end of the core sleeve 41, a rib 411 is provided on the outer wall of the core sleeve 41, and a notch 521 is provided in the mounting hole 54 of the back yoke piece 52. The recesses 412 may be in-line, cross-shaped, etc. When the power is on, under the action of the magnetic field of the winding coil 2, the movable iron core 42 moves to push the push rod 44, the push rod 44 compresses the reset pressure spring 45 to move outwards, and the reset pressure spring 45 stores elastic potential energy. When the power is cut off, the reset pressure spring 45 releases the elastic potential energy to drive the push rod 44 to reset.

Referring to fig. 5 and 6, the installation steps of the present embodiment are as follows:

(1) the current transformer 3 is sleeved on the terminal board 1. The yoke 5 is mounted on the housing 7.

(2) The terminal board 1 is spot-welded to one end of the winding coil 2, and the other end of the winding coil 2 is spot-welded to the connecting yoke piece 53 together with one end of the stationary contact 8.

(3) Since the current transformer blocks the back end of the yoke, the core assembly 4 is inserted into the mounting hole 54 of the front yoke piece 51, and is mounted from the front to the back, so that the core assembly 4 is positioned between the front yoke piece 51 and the back yoke piece 52, the rib 411 is inserted into the notch groove 521, and the core sleeve 41 is rotated in the tool insertion pit 412, so that the rib 411 is rotated to the inner end of the back yoke piece 52 and is clamped.

(4) The core assembly 4 is installed in the fastening hole 61 of the gasket 6, and the gasket 6 is fixed in the cavity of the housing 7.

When this embodiment uses, be connected current transformer and terminal board and miniature circuit breaker's circuit board, the current transformer detects the electric current condition, when the electric leakage condition appears, current transformer detects the abnormal conditions of electric current, with signal feedback to circuit board, 4 circular telegrams of winding coil, under the magnetic field effect that the winding coil produced, move iron core 42 along the motion of quiet iron core 43 direction, drive push rod 44 outwards movement, gasket 6 sets up to magnetic material, gasket 6 strengthens its magnetic circuit with yoke 5 jointly, it drives the free dropout module in the push rod 44 striking miniature circuit breaker fast to make iron core 42, realize the dropout.

Example two

As shown in fig. 8, the present embodiment discloses a magnetic tripping system of a small circuit breaker, which includes a terminal board 1, a coil assembly, a manganin sampling resistor 91, a current sampling terminal 92, and a voltage sampling terminal 93. The coil assembly comprises a winding coil 2, an iron core assembly 4, a magnet yoke 5 and a static contact 8.

The manganin sampling resistor 91 is embedded on the terminal board 1, and the terminal board 1 is a bending plate made of conductive material. The bending plate comprises a first straight section 12, a vertical section 11 and a second straight section 13, wherein the vertical section 11 is connected with the first straight section 12 and the second straight section 13. The manganin sampling resistor 91 both ends welding is on the vertical section 11 of terminal board 1, and the both sides of manganin sampling resistor 91 are located to current sampling end 92, and voltage sampling end 93 sets up in the arbitrary department of terminal board 1, and current sampling end 92 and voltage sampling end 93 all are connected with miniature circuit breaker's circuit board.

The yoke 5 includes a front yoke piece 51, a back yoke piece 52, and a connecting yoke piece 53. The front yoke piece 51 is arranged at the front end of the core assembly 4, and a fixing hole 55 is arranged on the front yoke piece. The back yoke piece 52 is provided at the rear end of the core assembly 4, and the connecting yoke piece 53 connects the front yoke piece 51 and the back yoke piece 52. The back yoke piece 52 is provided with a mounting hole 54 through which the core assembly 4 passes.

The structure of the iron core assembly 4 in the embodiment is the same as that in the first embodiment.

The installation steps of this embodiment are as follows:

(1) the manganin sampling resistor 91 is embedded on the terminal board 1, and the current sampling end 92 and the voltage sampling end 93 are arranged on the terminal board 1. The current sampling terminal 92 and the voltage sampling terminal 39 are connected to the wiring board of the small circuit breaker, and the terminal board 1 is connected to the wiring board of the small circuit breaker. The yoke 5 is mounted on the case 7 of the miniature circuit breaker.

(3) The core assembly 4 is inserted into the mounting hole 54 of the back yoke piece 51 and mounted from the back to the front so that the core assembly 4 is positioned between the front yoke piece 51 and the back yoke piece 52. The end of the static iron core 43 at the front end of the iron core assembly is clamped in the fixing hole 55 of the front yoke piece 51.

When this embodiment uses, current sampling end 92 and voltage sampling end 93 test electric current and voltage condition, when the electric leakage condition appears, current sampling end 92 and voltage sampling end 93 detect the abnormal conditions of electric current and voltage, feed back the signal to the circuit board, 4 circular telegrams of winding coil are electrified, under the magnetic field effect that winding coil 2 produced, move iron core 42 along quiet iron core 43 direction motion, drive push rod 44 and move freely tripping module in the striking miniature circuit breaker outward, realize the dropout.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.

Claims

1. The utility model provides a miniature circuit breaker's magnetism tripping system installs in miniature circuit breaker's casing, its characterized in that: comprises a terminal board, a current detection assembly and a coil assembly, wherein the current detection assembly is arranged on the terminal board,

the coil assembly comprises a winding coil, an iron core assembly, a magnetic yoke and a fixed contact, wherein the winding coil is wound on the periphery of the iron core assembly, the iron core assembly is arranged in the magnetic yoke, one end of the winding coil is welded with the terminal board, the other end of the winding coil and one end of the fixed contact are welded on the magnetic yoke in a spot welding mode, and the terminal board, the winding coil and the fixed contact form a current path.

2. The magnetic trip system of a miniature circuit breaker as set forth in claim 1, wherein: the current detection assembly is a current transformer, the terminal board is a bent board made of a conductive material, and the current transformer penetrates through the terminal board and is arranged on the outer ring of the bent board.

3. The magnetic trip system of a miniature circuit breaker according to claim 2, wherein: the bending plate comprises a first straight section, a vertical section and a second straight section, wherein the vertical section is connected with the first straight section and the second straight section, the first straight section is positioned at the edge of the shell, a vertical retaining wall is arranged in the shell, the vertical retaining wall is partially disconnected to form an accommodating space, the vertical section is arranged in the accommodating space and is arranged on the same plane with the vertical retaining wall, and the current transformer is sleeved on the outer ring of the second straight section.

4. The magnetic trip system of a miniature circuit breaker according to claim 2, wherein: the edge of the bending plate is provided with a chamfer.

5. The magnetic trip system of a miniature circuit breaker as set forth in claim 1, wherein: the current detection assembly comprises a manganin sampling resistor and two groups of current sampling ends, the manganin sampling resistor is embedded on a terminal board, the current sampling ends are arranged on two sides of the manganin sampling resistor, and the current sampling ends are connected with a circuit board of the miniature circuit breaker.

6. The magnetic trip system of a miniature circuit breaker according to claim 5, wherein: and the terminal board is also provided with a voltage sampling end, and the voltage sampling end is connected with a circuit board of the miniature circuit breaker.

7. The magnetic trip system of a small-sized circuit breaker according to any one of claims 1 to 6, wherein: the yoke including set up in the preceding yoke piece of core subassembly front end, set up in the back yoke piece of core subassembly rear end to and the connection yoke piece of connecting preceding yoke piece and back yoke piece, preceding yoke piece and back yoke piece on be equipped with the mounting hole that supplies the core subassembly to pass.

8. The magnetic trip system of a miniature circuit breaker according to claim 7, wherein: the iron core subassembly include the iron core sleeve pipe, install moving iron core, quiet iron core, the pressure spring and the push rod that reset in the iron core sleeve pipe, quiet iron core fix at iron core subassembly tip, quiet iron core the inner be equipped with the recess, pressure spring one end that resets install in the recess, the other end and push rod butt, push rod one end be located the iron core sleeve pipe inherent effect that moves the iron core and compress the pressure spring that resets down, the other end passes quiet iron core and stretches out outside the iron core sleeve pipe.

9. The magnetic trip system of a miniature circuit breaker according to claim 8, wherein: the magnetic yoke is characterized by further comprising a gasket made of magnetic conductive materials, wherein a clamping hole for inserting the end part of the static iron core is formed in the gasket, and the gasket is installed at the rear end of the front magnetic yoke piece.

10. The magnetic trip system of a miniature circuit breaker according to claim 8, wherein: the back end of the iron core sleeve is provided with a pit for rotation, the outer wall of the iron core sleeve is provided with a convex rib which is clamped and fixed at the inner side of the back magnetic yoke piece, and the mounting hole of the back magnetic yoke piece is provided with a notch groove.