阅读说明：本技术 一种漏电脱扣单元以及多极小型断路器 (Electric leakage tripping unit and multi-pole miniature circuit breaker ) 是由 李卫平 李根菊 于 2021-01-26 设计创作，主要内容包括：本发明公开一种脱扣反应更加灵敏的漏电脱扣单元以及多极小型断路器。采用的技术方案包括：设置在壳体内的电流互感器、与所述电流互感器连接的PCB板、与所述PCB板连接的电磁系统,其特征在于：还包括设置在壳体内的第一脱扣杠杆、第二脱扣杠杆、脱扣指示键、第一扭簧、第二扭簧,所述第一脱扣杠杆、第二脱扣杠杆以并排方式轴接在所述壳体内,所述第一脱扣杠杆具有第一轴部、以圆周排列在所述第一轴部上的第一杠杆部、第二杠杆部、第三杠杆部以及位于所述第二杠杆部、第三杠杆部之间的挂钩。(The invention discloses a leakage tripping unit with more sensitive tripping reaction and a multi-pole miniature circuit breaker. The technical scheme adopted comprises the following steps: the current transformer of setting in the casing, with the PCB board that current transformer connects, with the electromagnetic system that the PCB board is connected, its characterized in that: still including setting up first trip lever, second trip lever, dropout pilot key, first torsional spring, the second torsional spring in the casing, first trip lever, second trip lever are in with the side by side mode coupling in the casing, first trip lever has first axial region, is in with the circumference arrangement first lever portion, second lever portion, third lever portion on the first axial region and is located couple between second lever portion, the third lever portion.)

1. The utility model provides a leakage tripping unit, including setting up current transformer (2) in casing (1), with PCB board (3) that current transformer (2) are connected, with electromagnetic system (4) that PCB board (3) are connected, its characterized in that: still including setting up first trip lever (5), second trip lever (6), dropout instruction key (7), first torsional spring (8), second torsional spring (9) in casing (1), first trip lever (5), second trip lever (6) are in with the side by side mode hub connection in casing (1), first trip lever (5) have first axial region (10), arrange with the circumference first lever portion (11), second lever portion (12), third lever portion (13) on first axial region (10) and be located couple (14) between second lever portion (12), third lever portion (13), second trip lever (6) have second axial region (15), set up in the one end of second axial region (15) with fourth thick stick (16) of third lever portion (13) complex of first trip lever (5), The setting is in the other end of second shaft portion (15) and hasp (17) complex fifth lever portion (18) of circuit breaker unit, trip indication key (7) lower extreme be equipped with couple (14) complex hang groove (19), first torsional spring (8) wherein one end acts on respectively second lever portion (12) of first trip lever (5) and the lower extreme of trip indication key (7), second torsional spring (9) are used for right the restoration of first trip lever (5).

2. The leakage trip unit of claim 1, wherein: still include test button (20), test button (20) lower extreme is connected with third torsional spring (21), third torsional spring (21) wherein one end with PCB board (3) are connected, the other end extends to first torsional spring (8) department, the other end of first torsional spring (8) with PCB board (3) are connected, work as when test button (20) are pressed, third torsional spring (21) with first torsional spring (8) contact forms the return circuit.

3. The leakage trip unit of claim 1, wherein: and a positioning groove (23) is formed in the lower end of the tripping indicating key (7) and used for positioning the second lever part (12) of the first tripping lever (5).

4. The leakage trip unit of claim 1, wherein: a first positioning column (24) is arranged on a second lever part (12) of the first tripping lever (5), and a second positioning column (25) is arranged at the lower end of the tripping indicating key (7).

5. The leakage trip unit of claim 1, wherein: and a fourth torsion spring (26) is arranged on the second tripping lever (6).

6. The leakage trip unit of claim 1, wherein: the trip indicating key (7) is installed in a guide groove (27) in the shell (1), the trip indicating key (7) is provided with a lower stroke positioning part (28) and an upper stroke positioning part (29), the bottom of the lower stroke positioning part (28) is provided with an arc-shaped surface (30) matched with the first shaft part (10), and the upper stroke positioning part (29) is matched with the bottom of the guide groove (27) in a positioning mode.

7. A multipole miniature circuit breaker comprising a plurality of single-pole breaker units (31) connected in parallel, characterized in that: -said plurality of parallel single-pole breaker units (31) having one side mounted with the earth leakage trip unit (a) according to any of claims 1-6.

Technical Field

The invention relates to a leakage protection circuit breaker.

Background

A residual current circuit breaker (RCBO) is a switch electric appliance for preventing human body from electric shock or electric leakage in a low-voltage line to cause fire and explosion accidents. The power supply circuit is cut off rapidly when human body electric shock or equipment electric leakage occurs, so that the human body and the equipment are prevented from being damaged. The leakage protection circuit breaker structure comprises a circuit breaker unit and a leakage tripping unit arranged on one side of the circuit breaker unit. The structure of the conventional leakage tripping unit is shown in the Chinese patent with the patent application number of 201811371907.3 and the name of 201811371907.3. The structure mainly comprises: the tripping device comprises a tripping lever, an electromagnetic system and a tripping indicating key which are arranged in a shell of the circuit breaker, wherein the tripping lever and the tripping indicating key are reset by the same torsional spring. When tripping, the movable iron core of the electromagnetic system needs to overcome the force of the torsion spring, so that the tripping lever rotates clockwise. There are disadvantages in that: the moving iron core of the electromagnetic system needs larger force to overcome the force of the torsion spring, so that the tripping reaction is not sensitive enough or cannot be tripped.

Disclosure of Invention

The invention aims to provide an electric leakage tripping unit with more sensitive tripping reaction and a multi-pole miniature circuit breaker.

In order to solve the above problems, the technical scheme adopted by the invention comprises: the current transformer of setting in the casing, with the PCB board that current transformer connects, with the electromagnetic system that the PCB board is connected, its characterized in that: the trip device comprises a shell, and is characterized by further comprising a first trip lever, a second trip lever, a trip indicating key, a first torsion spring and a second torsion spring which are arranged in the shell, wherein the first trip lever and the second trip lever are connected in the shell in a side-by-side mode in a shaft mode, the first trip lever is provided with a first shaft part, a first lever part, a second lever part, a third lever part and a hook positioned between the second lever part and the third lever part, the first trip lever is arranged on the first shaft part in a circumferential mode, the second trip lever is provided with a second shaft part, a fourth lever part and a fifth lever, the fourth lever part is arranged at one end of the second shaft part and matched with the third lever part of the first trip lever, the fifth lever is arranged at the other end of the second shaft part and matched with a lock catch of a circuit breaker unit, a hanging groove matched with the hook is formed in the lower end of the trip indicating key, one end of the first torsion spring acts on the second lever part of the first trip lever, the second torsion spring is used for resetting the first tripping lever; when the tripping indication key is pressed down, the first torsion spring only acts on the lower end of the tripping indication key, and the hook at the upper end of the first tripping lever is automatically hooked with the hanging groove of the tripping indication key under the action of the second torsion spring; when tripping is performed, the hook of the first tripping lever is separated from the hanging groove of the tripping indicating key, the first torsion spring drives the tripping indicating key to move upwards firstly, and then drives the first tripping lever to rotate towards the side of the second tripping lever.

The electric leakage tripping unit is characterized in that: still include test button, test button lower extreme and third torsional spring are connected, third torsional spring wherein one end with the PCB board is connected, the third torsional spring other end extends to first torsional spring department, first torsional spring the other end of first torsional spring with the PCB board is connected, works as when test button is pressed, the third torsional spring with first torsional spring contact forms the return circuit.

The electric leakage tripping unit is characterized in that: and the lower end of the tripping indicating key is provided with a positioning groove for positioning the second lever part of the first tripping lever.

The electric leakage tripping unit is characterized in that: and a first positioning column is arranged on the second lever part of the first tripping lever, and a second positioning column is arranged at the lower end of the tripping indicating key.

The electric leakage tripping unit is characterized in that: and a fourth torsion spring is arranged on the second tripping lever.

The electric leakage tripping unit is characterized in that: the tripping indicating key is installed in a guide groove in the shell and is provided with a lower stroke positioning part and an upper stroke positioning part, the bottom of the lower stroke positioning part is provided with an arc-shaped surface matched with the first shaft part, and the upper stroke positioning part is matched with the bottom of the guide groove in a positioning mode.

A multipole miniature circuit breaker comprising a plurality of single-pole breaker units connected in parallel, characterized in that: the electric leakage tripping unit is arranged on one side of the plurality of parallel single-pole circuit breaker units.

The electric leakage tripping unit and the multi-pole miniature circuit breaker have the following advantages: the electromagnetic system can achieve faster tripping with less force.

Drawings

The invention is further described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of the leakage trip unit of the present invention, showing a reset state;

fig. 2 is a schematic structural diagram of the leakage trip unit of the present invention, showing a trip state;

fig. 3 is a schematic diagram of the connection between the leakage trip unit and the latch and the stationary contact of the circuit breaker unit according to the present invention;

fig. 4 is a schematic structural view of a first trip lever of the present invention;

fig. 5 is a schematic structural view of a second trip lever of the present invention;

FIG. 6 is a schematic structural view of a trip indicating key of the present invention;

figure 7 is a schematic view of the structure of the multipole miniature circuit breaker of the invention;

fig. 8 is a schematic view of the internal structure of the single pole circuit breaker unit of the present invention.

Detailed Description

Example 1:

referring to fig. 1 to 6, the leakage trip unit of the present invention includes a current transformer 2 disposed in a housing 1, a PCB 3 connected to the current transformer 2, and an electromagnetic system 4 connected to the PCB 3. The housing 1 is provided in common with or separately from the circuit breaker. The electromagnetic system 4 mainly comprises a magnet yoke, a coil, a movable iron core and a static iron core. The shell 1 is also internally provided with a first tripping lever 5, a second tripping lever 6, a tripping indicating key 7, a first torsion spring 8 and a second torsion spring 9. The first tripping lever 5 and the second tripping lever 6 are axially connected in the housing 1 in a side-by-side mode. The first trip lever 5 includes a first shaft portion 10, a first lever portion 11, a second lever portion 12, and a third lever portion 13 circumferentially arranged on the first shaft portion 10, and a hook 14 located between the second lever portion 12 and the third lever portion 13. The second trip lever 6 has a second shaft portion 15, a fourth lever portion 16 provided at one end of the second shaft portion 15 to be fitted with the third lever portion 13 of the first trip lever 5, and a fifth lever portion 18 provided at the other end of the second shaft portion 15 to be fitted with a latch 17 of a circuit breaker unit. The third lever part 13 of the first trip lever 5 is specifically matched with the fourth lever part 16 of the second trip lever 6 through a first hanging buckle 32 at the end part. The second trip lever 6 is specifically connected with the hooking groove 33 on the lock catch 17 through a second hook 34 at the front end of the fifth lever part 18. The lower end of the trip indicating key 7 is provided with a hanging groove 19 matched with the hook 14, and one end of the first torsion spring 8 acts on the second lever part 12 of the first trip lever 5 and the lower end of the trip indicating key 7 respectively. The second torsion spring 9 is used for resetting the first trip lever 5 and enabling the first trip lever to rotate in the counterclockwise direction. The torsion of the first torsion spring 8 is larger than that of the second torsion spring 9. When the tripping indication key 7 is pressed down, because the tripping indication key 7 is closer to the fulcrum of the first torsion spring 8, the first torsion spring 8 is only stressed at the lower end of the tripping indication key 7, the first tripping lever 5 rotates in the counterclockwise direction under the action of the second torsion spring 9, and the hook 14 at the upper end of the first tripping lever is automatically hooked with the hanging groove 19 of the tripping indication key 7, so that the resetting operation of the leakage tripping unit is realized. When an electric leakage fault occurs, the current transformer 2 detects the electric leakage fault, and when the PCB 3 judges that the line leakage current is greater than a preset value, the coil of the electromagnetic system 4 is instantly energized and generates a magnetic field to move the plunger toward the first trip lever 5 and drive the first trip lever 5 to rotate clockwise, so that the hook 14 of the first trip lever 5 is separated from the hanging groove 19 of the trip indication key 7. After the hook 14 of the first trip lever 5 is separated from the hanging groove 19 of the trip indicating key 7, the first torsion spring 8 drives the trip indicating key 7 to move upwards, and then drives the first trip lever 5 to rotate towards the second trip lever 6, so that the electromagnetic system 4 can realize quick trip by means of the force of the first torsion spring 8.

Preferably, the electric leakage tripping unit further comprises a test button 20, the lower end of the test button 20 is connected with a third torsion spring 21, one end of the third torsion spring 21 is connected with the PCB 3, the other end of the third torsion spring extends to the first torsion spring 8, the other end of the first torsion spring 8 is connected with the PCB 3, and when the test button 20 is pressed, the third torsion spring 21 contacts with the first torsion spring 8 to form a loop. And the PCB 3 judges the line leakage according to the loop signal and carries out leakage tripping action. Through the structure, the electric leakage test is realized by skillfully utilizing the conductive characteristics of the existing third torsion spring and the first torsion spring. Compared with a traditional electric leakage testing mechanism, the mode that the lead is connected to the copper sheet of the circuit breaker is simpler in structure, simpler in wiring, safe and reliable.

Preferably, the lower end of the trip indicating key 7 is provided with a positioning slot 23 for positioning the second lever part 12 of the first trip lever 5. The positioning slot 23 is matched with the second lever part 12 to limit the rotation angle of the first tripping lever 5, so as to prevent the first tripping lever 5 from impacting the second tripping lever 6 excessively, and further prevent damage to other parts.

Preferably, a first positioning column 24 is arranged on the second lever part 12 of the first tripping lever 5, a second positioning column 25 is arranged at the lower end of the tripping indication key 7, and the free end of the first torsion spring 8 acts on the first positioning column 24 and the second positioning column 25 respectively to ensure the connection stability.

Preferably, a fourth torsion spring 26 is arranged on the second trip lever 6 for resetting after the second trip lever 6 is tripped, and the torsion of the first torsion spring 8 is greater than that of the fourth torsion spring 26.

Preferably, the trip indicating key 7 is installed in a guide groove 27 in the housing 1, the trip indicating key 7 is provided with a lower stroke positioning portion 28 and an upper stroke positioning portion 29, the bottom of the lower stroke positioning portion 28 is provided with an arc surface 30 adapted to the first shaft portion 10, and the upper stroke positioning portion 29 is in positioning fit with the bottom of the guide groove 27. The accurate hooking of the hook 14 of the first tripping lever 5 and the hanging groove 19 of the tripping indication key 7 is realized by the accurate control of the stroke of the tripping indication key 7.

Example 2:

referring to fig. 7 to 8, the multi-pole miniature circuit breaker of the present invention comprises 4 single-pole breaker units 31 connected in parallel, and the leakage trip unit a described in embodiment 1 is installed at one side thereof.

Although the present invention has been described with reference to the above embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.