CN112185744A

CN112185744A - Switch with arc discharge protection

Info

Publication number: CN112185744A
Application number: CN202011141512.1A
Authority: CN
Inventors: 李�杰
Original assignee: Hangzhou Xinhe Engineering Management Consultation Co ltd
Current assignee: Hangzhou Xinhe Engineering Management Consultation Co ltd
Priority date: 2020-10-22
Filing date: 2020-10-22
Publication date: 2021-01-05

Abstract

The invention belongs to the technical field of electrical switches, and discloses a switch with arc discharge protection, which is characterized by comprising a base, a W-shaped bent pipe, a waterproof breathable film and an air pump, wherein the W-shaped bent pipe is arranged on the base; the W-shaped bent pipe is a hollow bent pipe with two wave troughs and one wave crest, and also comprises a first end and a second end; the wave crest of the W-shaped bent pipe is provided with an air hole, and the waterproof breathable film is fixedly connected with the inner wall of the air hole to completely cover the air hole; the inner walls of the first end and the second end of the W-shaped bent pipe are respectively connected with a piston, and the pistons can slide up and down along the inner walls of the first end and the second end; the wave trough end of the W-shaped bent pipe is fixedly connected with the upper end surface of the base; the first end and the second end of the W-shaped bent pipe are respectively connected with the air pump through air pipes. The invention has simple structure, convenient use, long service life of the switch and high safety, controls the on-off of the circuit by the on-off of the liquid metal, avoids the direct on-off between the contacts, only forms the arc between the liquid metal, and protects the contacts of the switch from being damaged by the influence of the arc.

Description

Switch with arc discharge protection

Technical Field

The invention belongs to the technical field of electrical switches, and particularly relates to a switch with arc discharge protection.

Background

With the expansion of industrial and agricultural production, various types of high-power equipment are used in production, and some inductive loads (such as motor sets, compressors, pumps, transformers, and the like) and capacitive loads (such as compensation capacitors) have low power, namely thousands of watts, and high power, namely tens of kilowatts or even higher. Due to the voltage and current characteristics of the circuit, the short-time current of the circuit during starting and breaking can be several times of the current during normal operation. Switches of the disconnecting link type often have a condition of obvious arc discharge. When a general switch is subjected to arc discharge, the surface temperature of an arc is three or four thousand degrees centigrade, the central temperature can reach ten thousand degrees centigrade, the situation that metal on the surface part of a contact of a disconnecting link switch is overheated and melted or evaporated is possibly caused, and an electric insulating material near the arc is burned out. The arc causes electrical wear and material erosion between the contacts, thereby affecting device life and greatly reducing operational reliability. In severe cases, fusion welding even occurs, so that the circuit cannot be disconnected, power supply accidents are caused, and the safety of personnel and equipment is endangered. For this reason, we have devised a switch with arcing protection to solve the above problems.

Disclosure of Invention

In order to solve the problems that the service life of a device is influenced and the working reliability is greatly reduced due to the abrasion and material erosion between contacts caused by arc discharge in the switching process of an electric switch, the invention adopts the following technical scheme.

A switch with arc discharge protection is characterized by comprising a base, a W-shaped bent pipe, a waterproof breathable film and an air pump;

the W-shaped bent pipe is a hollow bent pipe with two wave troughs and one wave crest, and also comprises a first end and a second end;

the wave crest of the W-shaped bent pipe is provided with an air hole, and the waterproof breathable film is fixedly connected with the inner wall of the air hole to completely cover the air hole;

the inner walls of the first end and the second end of the W-shaped bent pipe are respectively connected with a piston, and the pistons can slide up and down along the inner walls of the first end and the second end;

the wave trough end of the W-shaped bent pipe is fixedly connected with the upper end surface of the base;

a first liquid storage tank and a second liquid storage tank are further arranged on the left side and the right side of the W-shaped bent pipe, one ends of the first liquid storage tank and the second liquid storage tank are communicated with the W-shaped bent pipe, and the other ends of the first liquid storage tank and the second liquid storage tank are sealed;

liquid metal is placed in the W-shaped bent pipe;

the first end and the second end of the W-shaped bent pipe are respectively connected with the air pump through air pipes.

Preferably, the W-shaped bent pipe is integrally formed with the first reservoir and the second reservoir, and is made of an insulating material.

Preferably, the outer diameter of the piston matches the inner diameter of the first and second ends.

Preferably, the interior of the first reservoir communicates with the first electrical contact by a conductive wire, and the interior of the second reservoir communicates with the second electrical contact by a conductive wire.

Preferably, the liquid metal is mercury.

Preferably, a pressure sensor is arranged on the end face of the piston in contact with the liquid metal.

Preferably, the pressure sensor and the air pump are both electrically connected with the control center.

Compared with the prior art, the invention has the beneficial effects that:

the switch with the arc protection function is simple in structure, convenient to use, long in service life and high in safety, the on-off of a circuit is controlled through the on-off of the liquid metal, the direct on-off of contacts is avoided, the arc can be formed only between the liquid metal, and the contacts of the switch are protected from being damaged due to the influence of the arc.

The switch with the arc discharge protection function can be remotely controlled to be switched on and off through the control center, so that the safety of operation in a high-voltage environment is guaranteed, and the operation is more flexible.

The switch with the arc protection function can ensure the balance of air pressure at the wave crest of the W-shaped bent pipe and prevent the liquid metal from overflowing through the design of the waterproof breathable film on the breathable holes.

And fourthly, the switch with the arc protection function can feed back the state of the liquid metal in the W-shaped bent pipe to a control center through a pressure sensor arranged on the end surface of the piston, so that the normal operation of the switch is ensured.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a schematic external view of the present invention;

FIG. 3 is a schematic diagram of the present invention as a switch on;

in the figure: 1. the device comprises a base, a W-shaped bent pipe, a gas-permeable hole, a gas-permeable waterproof membrane, a first end, a second end, a gas-permeable waterproof membrane, a first liquid storage tank, a second liquid storage tank, a piston, a gas pump, an air pipe, a liquid metal, a first electric contact, a second electric contact, a gas pump, a gas pipe, a gas-permeable waterproof membrane, a piston, a gas pump, a gas-permeable waterproof membrane, a gas.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application. In the drawings of the embodiments of the present application, hatching of various types in the drawings is not labeled according to national standards, does not require the material of elements, and distinguishes the sectional views of the elements in the drawings.

Referring to fig. 1-3, a switch with arc discharge protection is shown for protecting the switch from arc discharge damage. Specifically, a switch with arc discharge protection comprises a base 1, a W-shaped bent pipe 2, a waterproof breathable film 3 and an air pump 7.

W type return bend 2 is for having the cavity return bend of a crest of two troughs, and bleeder vent 201 has been seted up to 2 crest departments of W type return bend, and waterproof ventilated membrane 3 links to each other with the inner wall of bleeder vent 201 is fixed, covers bleeder vent 201 completely, can guarantee the atmospheric pressure balance of 2 crest departments of W type return bend like this, also can not make liquid metal 9's excessive. The W-shaped bent pipe 2 further comprises a first end 202 and a second end 203, the inner walls of the first end 202 and the second end 203 of the W-shaped bent pipe 2 are respectively connected with a piston 6, the piston 6 can slide up and down along the inner walls of the first end 202 and the second end 203, the outer diameter of the piston 6 is matched with the inner diameters of the first end 202 and the second end 203, the liquid metal 9 is mercury with good conductivity, the first end 202 and the second end 203 of the W-shaped bent pipe 2 are respectively connected with an air pump 7 through an air pipe 8 and are used for controlling the movement of the piston 6 so as to control the movement of the liquid metal 9, a pressure sensor is arranged on the end surface of the piston 6, which is in contact with the liquid metal 9, and is electrically connected with a control center, so that the state of the liquid metal 9 inside the W-shaped bent pipe 2 can be fed back to the control center, the normal operation of the switch can be ensured, the on, the operation is more flexible.

The left side and the right side of the W-shaped bent pipe 2 are further provided with a first liquid storage tank 4 and a second liquid storage tank 5, one ends of the first liquid storage tank 4 and the second liquid storage tank 5 are communicated with the W-shaped bent pipe 2, the other ends of the first liquid storage tank 4 and the second liquid storage tank 5 are sealed, the W-shaped bent pipe 2, the first liquid storage tank 4 and the second liquid storage tank 5 are integrally formed, and the W-shaped bent pipe 2, the first liquid storage tank 4 and. The inside of the first liquid storage tank 4 is communicated with the first electric contact a through a conducting wire, the inside of the second liquid storage tank 5 is communicated with the second electric contact b through a conducting wire, the trough end of the W-shaped bent pipe 2 is fixedly connected with the upper end face of the base 1, the W-shaped bent pipe 2 and the base 1 are installed, the liquid level of liquid metal 9 in the W-shaped bent pipe 2 is ensured to be parallel to the end face of the base 1, in addition, when the whole body is used as a switch, the included angle between the end face of the base 1 and the horizontal plane cannot be operated by 30 degrees, and otherwise, the switch can lose the effect.

When the circuit needs to be switched on, the control center controls the air pump 7 to be opened, the piston 6 moves downwards along the first end 202 and the second end 203 of the W-shaped bent pipe 2 respectively under the action of the pressure of air, so that the liquid metal 9 converges towards the middle, the first electric contact a is communicated with the second electric contact b, meanwhile, the pressure sensor feeds back the contact condition of the liquid metal 9 to the control center, the air pump 7 is always opened during the period, the connection of the liquid metal 9 at the two ends of the W-shaped bent pipe 2 is kept, when the circuit needs to be switched off, the air pump 7 is closed, and the liquid metal 9 returns to the initial state under the action of the self gravity of the liquid metal 9 due to different liquid level heights of the liquid metal 9, so that the circuit is switched off.

The above; but are merely preferred embodiments of the present application; the scope of protection of the present application is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the application are equally replaced or changed; are intended to be covered by the scope of the present application.

Claims

1. A switch with arc discharge protection is characterized by comprising a base (1), a W-shaped bent pipe (2), a waterproof breathable film (3) and an air pump (7);

the W-shaped bent pipe (2) is a hollow bent pipe with two wave troughs and one wave crest, and also comprises a first end (202) and a second end (203);

the wave crest of the W-shaped bent pipe (2) is provided with an air vent (201), and the waterproof air-permeable membrane (3) is fixedly connected with the inner wall of the air vent (201) to completely cover the air vent (201);

the inner walls of the first end (202) and the second end (203) of the W-shaped bent pipe (2) are respectively connected with a piston (6), and the pistons (6) can slide up and down along the inner walls of the first end (202) and the second end (203);

the wave trough end of the W-shaped bent pipe (2) is fixedly connected with the upper end surface of the base (1);

a first liquid storage tank (4) and a second liquid storage tank (5) are further arranged on the left side and the right side of the W-shaped bent pipe (2), one ends of the first liquid storage tank (4) and the second liquid storage tank (5) are communicated with the W-shaped bent pipe (2), and the other ends of the first liquid storage tank and the second liquid storage tank are sealed;

liquid metal (9) is placed in the W-shaped bent pipe (2);

the first end (202) and the second end (203) of the W-shaped elbow (2) are respectively connected with an air pump (7) through an air pipe (8).

2. A switch with arcing protection according to claim 1, wherein the W-shaped elbow (2) and the first and second reservoirs (4, 5) are integrally formed and made of an insulating material.

3. A switch with arc discharge protection according to claim 1, characterized in that the outer diameter of the piston (6) is matched to the inner diameter of the first end (202) and the second end (203).

4. A switch with arcing protection according to claim 2, wherein the first reservoir (4) communicates internally with the first electrical contact (a) by means of a wire and the second reservoir (5) communicates internally with the second electrical contact (b) by means of a wire.

5. A switch with arcing protection according to claim 1, characterized in that the liquid metal (9) is mercury.

6. A switch with arcing protection according to claim 5, wherein the piston (6) is provided with a pressure sensor on the end face that contacts the liquid metal (9).

7. The switch with the arc discharge protection function according to claim 6, wherein the pressure sensor and the air pump (7) are electrically connected with the control center.