CN110853993A - Electric protection device - Google Patents

Abstract

The invention discloses an electrical protection device, comprising an insulating casing, a fuse tube, a resistor, an electromagnetic coil and a mechanical connecting rod. The connected first end is electrically connected with the first terminal, the second end is electrically connected with the outlet end, the electromagnetic coil is sleeved with a metal rod connected with the mechanical link, the mechanical link is connected with the fuse wire, and is For driving the fuse wire tube to rotate, the first end of the fuse wire tube can be electrically connected with the incoming wire end and the first terminal, and the second end of the fuse wire tube can be electrically connected with the outgoing wire end. When the fuse tube is blown due to overcurrent or overvoltage, the current will pass through the electromagnetic coil and the electromagnetic coil will generate a strong magnetic field, and the strong magnetic field will drive the mechanical link through the metal rod, thereby disconnecting the fuse tube from the first terminal and the incoming The connection between the wire ends realizes the automatic switch off after the fuse tube is blown, and improves the electrical protection effect.

Description

an electrical protection device

technical field

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

Background technique

In the power system, in order to improve the safety of electricity consumption, it is generally necessary to install electrical protection devices. At present, miniature circuit breakers are usually used as electrical protection devices in the low-voltage section of the power system. However, the overcurrent protection current value of miniature circuit breakers is generally greater than 10A. For power systems with operating currents less than 10A, miniature circuit breakers cannot achieve overcurrent protection. Function. In order to achieve overcurrent protection with a working current of less than 10A, some power systems use fuses as electrical protection devices. However, fuses do not have the second-stage protection function of circuit breakers, nor can they achieve good electrical protection.

SUMMARY OF THE INVENTION

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

The content of the present invention is as follows:

An electrical protection device includes an insulating housing and a fuse tube, a resistor, an electromagnetic coil and a mechanical connecting rod all arranged inside the insulating housing, and the insulating housing is provided with a first terminal and an incoming wire and the outlet end, the first end after the resistor and the electromagnetic coil are connected in series is electrically connected with the first terminal, and the second end after the resistor and the electromagnetic coil are connected in series is connected with the outlet end Electrically connected, the electromagnetic coil is sleeved with a metal rod connected with the mechanical link, the mechanical link is connected with the fuse tube, and is used to drive the fuse tube to rotate, the fuse The first end of the tube can be electrically connected to the incoming wire end and the first terminal, and the second end of the fuse tube can be electrically connected to the outgoing wire end.

Preferably, the mechanical link is rotatably connected in the insulating housing through a fixed shaft, a transverse link is connected between the mechanical link and the fuse tube, and one end of the transverse link is connected to the mechanical The connecting rod is rotatably connected, and the other end of the transverse connecting rod is rotatably connected with the fuse tube.

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

Preferably, a cover plate is provided on the insulating casing and above the fuse tube.

Preferably, wire fastening bolts are provided on the insulating housing, and the wire fastening bolts are used to fasten the wires at the incoming wire end and the outgoing wire end.

Preferably, the bottom of the insulating casing is provided with a clip.

Preferably, an operating handle is provided on the insulating housing, and the operating handle is connected with the mechanical link.

The beneficial effects of the invention are as follows: in the working state, the fuse wire tube can realize the function of circuit conduction, and when the fuse wire tube is blown due to overcurrent or overvoltage, the current will pass through the electromagnetic coil and the electromagnetic coil will generate a strong magnetic field, and the strong magnetic field will be generated by the electromagnetic coil. The magnetic field drives the mechanical connecting rod through the metal rod, thereby disconnecting the connection between the fuse wire tube and the first terminal and the incoming wire, realizing the automatic switch off after the fuse wire tube is blown, and improving the electrical protection effect.

Description of drawings

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

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

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

FIG. 4 is a structural diagram of an embodiment of the present invention.

Detailed ways

The above description is only an overview of the technical solutions of the present invention, in order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand , the following specific preferred embodiments, and in conjunction with the accompanying drawings, are described in detail as follows.

1-3 , an 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 connecting rod 5 all disposed inside the insulating housing 1 , The insulating housing 1 is provided with a first terminal 10, an incoming terminal 11 and an outgoing terminal 12. The first terminal after the resistor 3 and the electromagnetic coil 4 are connected in series is electrically connected to the first terminal 10. The resistor 3 and the electromagnetic coil are electrically connected to the first terminal 10. 4. The second end connected in series is electrically connected with the outlet end 12. The electromagnetic coil 4 is sleeved with a metal rod 6 connected with the mechanical connecting rod 5. The mechanical connecting rod 5 is connected with the fuse wire tube 2 and is used to drive the fuse wire. When the tube 2 is rotated, the first end of the fuse tube 2 can be electrically connected to the incoming wire end 11 and the first terminal 10 , and the second end of the fuse wire tube 2 can be electrically connected to the outgoing wire end 12 .

Please refer to FIG. 2-3 , in the working state, the first end of the fuse tube 2 is electrically connected to the incoming terminal 11 and the first terminal 10 respectively, and the second end of the fuse tube 2 is electrically connected to the outgoing terminal 12 Connection, the fuse tube 2 is connected in parallel with the branch circuit composed of the resistor 3 and the electromagnetic coil 4. At this time, the total current I=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; The resistance value, the resistance 3 and the electromagnetic coil 4 are equivalent to an open circuit, the current flows from the incoming end 11 to the outgoing end 12 through the a-b-c-d branch, the total current I≈I0, and the fuse tube 2 plays the role of circuit conduction.

When the fuse wire tube 2 is fused due to overcurrent or overvoltage, the current flows to the outlet end 12 through the a-e-f-d branch, and the electromagnetic coil 4 generates a strong magnetic field. Move, the metal rod 6 drives the mechanical connecting rod 5 to rotate, and 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 terminal 10 and the incoming wire end 11, so as to achieve the device The effect of the overall power outage.

In this embodiment, the incoming terminal 11 and the first terminal 10 are electrically connected through the first end of the fuse tube 2 . The passage between the incoming wire ends 11 is automatically disconnected from the live state to ensure the safety of replacing the fuse tube 2 .

Specifically, the mechanical link 5 is rotatably connected to the insulating housing 1 through the fixed shaft 7 , a transverse link 8 is connected between the mechanical link 5 and the fuse tube 2 , and one end of the transverse link 8 rotates with the mechanical link 5 The other end of the transverse link 8 is connected with the fuse tube 2 in rotation. In this embodiment, the metal rod 6 , the mechanical link 5 , the transverse link 8 and the fuse wire tube 2 are linked together, and the metal rod 6 is driven by the electromagnetic coil 4 . It can enter the working state in time, and the structure of this embodiment is simple and compact, which is beneficial to reduce the volume of the device.

According to the actual production needs, by adjusting the resistance value of the resistor 3 and the impedance value of the electromagnetic coil 4, different maximum working current values can be set. When the current value flowing through the electromagnetic coil 4 is greater than the maximum working current value, the electromagnetic coil 4 is strong The magnetic field makes the device trip off, thus realizing the tripping function. The maximum working current value of the electromagnetic coil 4 in this embodiment is less than or equal to 10A. Compared with the existing miniature circuit breaker, this embodiment can protect the power system with the working current less than 10A.

Referring to FIG. 4 , a cover plate 13 is provided on the insulating housing 1 and above the fuse tube 2 , which is convenient for replacing the fuse tube 2 , and can prevent dust from entering the position of the fuse tube 2 to ensure good circuit contact.

The insulating housing 1 is provided with wire tightening bolts 14 , and the wire tightening bolts 14 are used for tightening the wires at the incoming wire end 11 and the wire outgoing end 12 .

The bottom of the insulating shell 1 is provided with a clip 15, which can be used in combination with other miniature circuit breakers, leakage circuit breakers, surge protectors, etc. Small-capacity load equipment), and electrical components (such as surge protectors, etc.), can also be used as maintenance isolation control equipment.

An operating handle 16 is provided on the insulating housing 1, and the operating handle 16 is connected with the mechanical connecting rod 5. Through the operating handle 16, closing or opening operations can be performed according to actual needs, and when the fuse tube 2 is blown, the operating handle The position of 16 clearly indicates the state of the fuse tube 2 .

The insulating housing 1 of this embodiment is made of fire-resistant and high-temperature resistant materials, which meet electrical safety requirements.

The above descriptions are only preferred embodiments of the present invention, and the present invention is not limited to the above-mentioned embodiments, as long as the technical effects of the present invention are achieved by the same means, they should all belong to the protection scope of the present invention. Various modifications and changes can be made to its technical solutions and/or implementations within the protection scope of the present invention.

Claims (7)

1. An electrical protection device, characterized in that it comprises an insulating housing (1) and a fuse tube (2), a resistor (3), and an electromagnetic coil (4) all arranged inside the insulating housing (1) and a mechanical connecting rod (5), the insulating housing (1) is provided with a first terminal (10), an incoming wire end (11) and an outgoing wire end (12), the resistance (3) and the electromagnetic The first end of the coil (4) connected in series is electrically connected to the first terminal (10), and the second end of the resistor (3) and the electromagnetic coil (4) connected in series is connected to the outlet wire The end (12) is electrically connected, the electromagnetic coil (4) is sleeved with a metal rod (6) connected with the mechanical connecting rod (5), and the mechanical connecting rod (5) is connected with the fuse wire tube (2) connected and used to drive the fuse tube (2) to rotate, the first end of the fuse tube (2) can be connected with the incoming wire end (11) and the first terminal (10) For electrical connection, the second end of the fuse tube (2) can be electrically connected to the outlet end (12). 2. The electrical protection device according to claim 1, characterized in that: the mechanical connecting rod (5) is rotatably connected in the insulating housing (1) through a fixed shaft (7), and the mechanical connecting rod ( 5) A transverse link (8) is connected with the fuse tube (2), one end of the transverse link (8) is rotatably connected with the mechanical link (5), and the transverse link ( The other end of 8) is rotatably connected with the fuse tube (2). 3. The electrical protection device according to claim 1, characterized in that: the maximum operating current value of the electromagnetic coil (4) is less than or equal to 10A. 4 . The electrical protection device according to claim 1 , wherein a cover plate ( 13 ) is arranged on the insulating housing ( 1 ) and above the fuse tube ( 2 ). 5 . 5. The electrical protection device according to claim 1, characterized in that: the insulating housing (1) is provided with wire fastening bolts (14), and the wire fastening bolts (14) are used to fasten the The wires of the incoming wire end (11) and the outgoing wire end (12). 6 . The electrical protection device according to claim 1 , characterized in that: the bottom of the insulating housing ( 1 ) is provided with a clip ( 15 ). 7 . 7. The electrical protection device according to claim 1, characterized in that: an operating handle (16) is provided on the insulating housing (1), the operating handle (16) and the mechanical connecting rod (5) connect.

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