CN110853993A

CN110853993A - Electric protection device

Info

Publication number: CN110853993A
Application number: CN201910973256.3A
Authority: CN
Inventors: 李越
Original assignee: Zhuhai Shengshi Yunke Intelligent Technology Co Ltd
Current assignee: Zhuhai Shengshi Yunke Intelligent Technology Co Ltd
Priority date: 2019-10-14
Filing date: 2019-10-14
Publication date: 2020-02-28

Abstract

The invention discloses an electrical protection device which comprises an insulating shell, a fuse wire tube, a resistor, an electromagnetic coil and a mechanical connecting rod, wherein a first wiring terminal, a wire inlet terminal and a wire outlet terminal are arranged on the insulating shell, the first terminal of the resistor and the electromagnetic coil after being connected in series is electrically connected with the first wiring terminal, the second terminal of the resistor and the wire outlet terminal are electrically connected, a metal rod connected with the mechanical connecting rod is sleeved in the electromagnetic coil, the mechanical connecting rod is connected with the fuse wire tube and used for driving the fuse wire tube to rotate, the first terminal of the fuse wire tube can be electrically connected with the wire inlet terminal and the first wiring terminal, and the second terminal of the fuse wire tube can be electrically connected with the wire outlet. When the fuse wire tube is fused due to overcurrent or overvoltage, current can pass through the electromagnetic coil and enable the electromagnetic coil to generate a strong magnetic field, and the strong magnetic field drives the mechanical connecting rod through the metal rod, so that the connection between the fuse wire tube and the first wiring end and the wire inlet end is disconnected, the fuse wire tube is automatically switched off after being fused, and the electrical protection effect is improved.

Description

Electric protection device

Technical Field

The invention relates to the technical field of electrical protection, in particular to an electrical protection device.

Background

In an electric power system, an electric protection device is generally required to be installed in order to improve safety of power consumption. At present, a miniature circuit breaker is generally adopted as an electrical protection device in a low-voltage section of a power system, however, the overcurrent protection current value of the miniature circuit breaker is generally larger than 10A, and for the power system with the working current smaller than 10A, the miniature circuit breaker cannot realize the overcurrent protection function. In order to realize overcurrent protection with working current less than 10A, a part of electric power systems adopt a fuse as an electric protection device, however, the fuse does not have the two-stage protection function of a circuit breaker and cannot well achieve the electric protection effect.

Disclosure of Invention

In view of the defects in the prior art, the present invention is directed to at least solve one of the technical problems in the prior art, and provides an electrical protection device for solving the problem that the existing electrical protection device cannot achieve the electrical protection effect well.

The invention comprises the following contents:

the utility model provides an electrical protection device, includes insulating housing and all sets up inside fuse tube, resistance, solenoid and the mechanical connecting rod of insulating housing, last first wiring end, inlet wire end and the leading-out terminal of being provided with of insulating housing, resistance with first end after the solenoid series connection with first wiring end electric connection, resistance with second end after the solenoid series connection with leading-out terminal electric connection, the solenoid endotheca be equipped with the metal pole that mechanical connecting rod is connected, mechanical connecting rod with fuse tube connects, and is used for the drive fuse tube rotates, fuse tube's first end can with the inlet wire end with first wiring end electric connection, fuse tube's second end can with leading-out terminal electric connection.

Preferably, the mechanical connecting rod is rotatably connected in the insulating shell through a fixed shaft, a transverse connecting rod is connected between the mechanical connecting rod and the fusing wire tube, one end of the transverse connecting rod is rotatably connected with the mechanical connecting rod, and the other end of the transverse connecting rod is rotatably connected with the fusing wire tube.

Preferably, the maximum operating current value of the electromagnetic coil is less than or equal to 10A.

Preferably, a cover plate is arranged on the insulating shell and above the fusing wire tube.

Preferably, an electric wire fastening bolt is arranged on the insulating shell and used for fastening the electric wires at the wire inlet end and the wire outlet end.

Preferably, the bottom of the insulating shell is provided with a clamping pin.

Preferably, an operating handle is arranged on the insulating shell, and the operating handle is connected with the mechanical connecting rod.

The invention has the beneficial effects that: when the fuse wire tube is in a working state, the fuse wire tube can achieve a circuit conduction effect, when the fuse wire tube is fused due to overcurrent or overvoltage, current can pass through the electromagnetic coil and enable the electromagnetic coil to generate a strong magnetic field, the strong magnetic field drives the mechanical connecting rod through the metal rod, so that connection between the fuse wire tube and the first wiring end and connection between the fuse wire tube and the wire inlet end is disconnected, automatic brake drop is achieved after the fuse wire tube is fused, and an electrical protection effect is improved.

Drawings

FIG. 1 is a schematic structural diagram of an open state according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a closing state according to an embodiment of the present invention;

FIG. 3 is a circuit schematic of an embodiment of the present invention;

fig. 4 is a block diagram showing an embodiment of the present invention.

Detailed Description

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Referring to fig. 1-3, the electrical protection device disclosed in this embodiment includes an insulating housing 1, and a fuse tube 2, a resistor 3, an electromagnetic coil 4 and a mechanical link 5 all disposed inside the insulating housing 1, where the insulating housing 1 is provided with a first terminal 10, a wire inlet terminal 11 and a wire outlet terminal 12, a first end of the resistor 3 and the electromagnetic coil 4 connected in series is electrically connected to the first terminal 10, a second end of the resistor 3 and the electromagnetic coil 4 connected in series is electrically connected to the wire outlet terminal 12, a metal rod 6 connected to the mechanical link 5 is sleeved in the electromagnetic coil 4, the mechanical link 5 is connected to the fuse tube 2 and is used to drive the fuse tube 2 to rotate, the first end of the fuse tube 2 can be electrically connected to the wire inlet terminal 11 and the first terminal 10, and the second end of the fuse tube 2 can be electrically connected to the wire outlet terminal 12.

Referring to fig. 2-3, in the operating state, the first end of the fuse tube 2 is electrically connected to the incoming line terminal 11 and the first terminal 10, the second end of the fuse tube 2 is electrically connected to the outgoing line terminal 12, and the fuse tube 2 is connected in parallel to the branch circuit formed by the resistor 3 and the electromagnetic coil 4. At this time, the total current I is I1+ I0, where I1 is the current flowing through the resistor 3 and the electromagnetic coil 4, and I0 is the current flowing through the fuse tube 2; because the resistance of the resistor 3 is far larger than that of the fuse tube 2, the resistor 3 and the electromagnetic coil 4 are equivalent to open circuit, current flows from the incoming line terminal 11 to the outgoing line terminal 12 through the a-b-c-d branch, the total current I is approximately equal to I0, and the fuse tube 2 plays a role in conducting a circuit.

When the fuse wire tube 2 is fused due to overcurrent or overvoltage, current flows to the wire outlet end 12 through the a-e-f-d branch, the electromagnetic coil 4 generates a strong magnetic field, the metal rod 6 moves along the axial direction of the coil 4 under the action of electromagnetic force of the strong magnetic field, the metal rod 6 drives the mechanical connecting rod 5 to rotate, and meanwhile, the mechanical connecting rod 5 drives the fuse wire tube 2 to rotate, so that the first end of the fuse wire tube 2 is separated from the first wire connecting end 10 and the wire inlet end 11, and the effect of overall power failure of the device is achieved.

The incoming line end 11 and the first terminal 10 of the embodiment are electrically connected through the first end of the fusing wire tube 2, so that the path between the first terminal 10 and the incoming line end 11 can be cut off after the fusing wire tube 2 is separated from the incoming line end 11, the electrified state is automatically separated, and the safety of replacing the fusing wire tube 2 is ensured.

Specifically, mechanical connecting rod 5 rotates through fixed axle 7 and connects in insulating housing 1, is connected with horizontal connecting rod 8 between mechanical connecting rod 5 and fusing silk pipe 2, and the one end and the mechanical connecting rod 5 of horizontal connecting rod 8 rotate and are connected, and the other end and the fusing silk pipe 2 of horizontal connecting rod 8 rotate and are connected. The metal rod 6, the mechanical connecting rod 5, the transverse connecting rod 8 and the fusing wire tube 2 of this embodiment are linked together, the metal rod 6 is driven by the electromagnetic coil 4, the brake cannot be dropped even if the external power fails, the working state can be timely entered when the power supply is recovered, and the simple and compact structure of this embodiment is favorable for reducing the volume of the device.

According to actual production needs, different maximum working current values can be set by adjusting the resistance value of the resistor 3 and the impedance value of the electromagnetic coil 4, and when the current value flowing through the electromagnetic coil 4 is larger than the maximum working current value, the electromagnetic coil 4 causes the device to be switched off by a strong magnetic field, so that the tripping function is realized. The maximum operating current value of the electromagnetic coil 4 in the present embodiment is less than or equal to 10A, and compared with the existing miniature circuit breaker, the present embodiment can protect the power system with the operating current less than 10A.

Referring to fig. 4, a cover plate 13 is disposed on the insulating housing 1 and above the fuse tube 2 for facilitating replacement of the fuse tube 2, and preventing dust from entering the fuse tube 2 to ensure good circuit contact.

The insulating housing 1 is provided with an electric wire fastening bolt 14, and the electric wire fastening bolt 14 is used for fastening electric wires of the wire inlet end 11 and the wire outlet end 12.

The bottom of the insulating shell 1 is provided with a clamping pin 15 which can be used in combination with other miniature circuit breakers, leakage breakers, surge protectors and the like, is uniformly installed on a fixed track, can be independently used as protective electric equipment (especially equipment with small capacity load) and electrical elements (such as the surge protector and the like), and can also be used as maintenance isolation control equipment.

An operating handle 16 is arranged on the insulating shell 1, the operating handle 16 is connected with the mechanical connecting rod 5, switching-on or switching-off operation can be carried out according to actual needs through the operating handle 16, and after the fusing wire tube 2 is fused, the state of the fusing wire tube 2 can be clearly indicated through the position of the operating handle 16.

The insulating shell 1 of this embodiment is made of fireproof and high temperature resistant material, and meets the electrical safety requirements.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and the present invention shall fall within the protection scope of the present invention as long as the technical effects of the present invention are achieved by the same means. The invention is capable of other modifications and variations in its technical solution and/or its implementation, within the scope of protection of the invention.

Claims

1. An electrical protection device, characterized by: the fuse wire device comprises an insulating shell (1), a fuse wire tube (2), a resistor (3), an electromagnetic coil (4) and a mechanical connecting rod (5) which are all arranged inside the insulating shell (1), wherein a first wiring end (10), a wire inlet end (11) and a wire outlet end (12) are arranged on the insulating shell (1), the resistor (3) and the electromagnetic coil (4) are electrically connected with the first wiring end (10) at a first end after being connected in series, the resistor (3) and the electromagnetic coil (4) are electrically connected with the wire outlet end (12) at a second end after being connected in series, a metal rod (6) connected with the mechanical connecting rod (5) is sleeved in the electromagnetic coil (4), the mechanical connecting rod (5) is connected with the fuse wire tube (2) and used for driving the fuse wire tube (2) to rotate, the first end of the fuse wire tube (2) can be electrically connected with the wire inlet end (11) and the first wiring end (10), and the second end of the fusing wire tube (2) can be electrically connected with the wire outlet end (12).

2. An electrical protection device according to claim 1, wherein: mechanical connecting rod (5) rotate through fixed axle (7) and connect in insulating casing (1), mechanical connecting rod (5) with be connected with horizontal connecting rod (8) between fusing silk pipe (2), the one end of horizontal connecting rod (8) with mechanical connecting rod (5) rotate and are connected, the other end of horizontal connecting rod (8) with fusing silk pipe (2) rotate and are connected.

3. An electrical protection device according to claim 1, wherein: the maximum working current value of the electromagnetic coil (4) is less than or equal to 10A.

4. An electrical protection device according to claim 1, wherein: and a cover plate (13) is arranged on the insulating shell (1) and above the fusing wire tube (2).

5. An electrical protection device according to claim 1, wherein: an electric wire fastening bolt (14) is arranged on the insulating shell (1), and the electric wire fastening bolt (14) is used for fastening electric wires of the wire inlet end (11) and the wire outlet end (12).

6. An electrical protection device according to claim 1, wherein: the bottom of the insulating shell (1) is provided with a clamping pin (15).

7. An electrical protection device according to claim 1, wherein: an operating handle (16) is arranged on the insulating shell (1), and the operating handle (16) is connected with the mechanical connecting rod (5).