CN111564335A

CN111564335A - Non-contact magnetic control switch based on self-assembly phenomenon of non-magnetic particles in magnetic fluid

Info

Publication number: CN111564335A
Application number: CN202010516691.6A
Authority: CN
Inventors: 牛小东; 王誉乔; 温明富; 黎倩萍; 章诗婷; 张豪
Original assignee: Shantou University
Current assignee: Shantou University
Priority date: 2020-06-08
Filing date: 2020-06-08
Publication date: 2020-08-21

Abstract

The embodiment of the invention discloses a non-contact magnetic control switch based on the self-assembly phenomenon of non-magnetic particles in magnetic fluid, which comprises a switch end cover module, a switch cavity module, electrode wires, a base plate, a controllable electromagnet and a permanent magnet, wherein the switch cavity module comprises a cylindrical surface and a top surface, at least one pair of electrode wire connecting holes which are in one-to-one correspondence are arranged between the cylindrical surface and the top surface, and magnetic fluid mixed liquid is contained in the switch cavity module; the switch end cover module is provided with switch cavity assembly holes which are arranged up and down, and permanent magnet installation grooves which correspond to the electrode wire connection holes on the cylindrical surface are arranged on the side surfaces, the number of pairs of the electrode wire connection holes is consistent with that of the permanent magnet installation grooves, and the switch cavity module is assembled in the switch cavity assembly holes; the switch cavity module is fixedly arranged on the base plate. By adopting the invention, a non-contact high-heat-dissipation switch can be realized, and the switch is suitable for severe working conditions.

Description

Non-contact magnetic control switch based on self-assembly phenomenon of non-magnetic particles in magnetic fluid

Technical Field

The invention relates to a magnetic control switch, in particular to a non-contact magnetic control switch based on the self-assembly phenomenon of non-magnetic particles in magnetic fluid.

Background

A switch is an electronic component that opens a circuit, interrupts current, or connects to another circuit. The switch is widely applied and is visible everywhere in daily life, and almost all electronic and electric equipment are provided with the switch. The requirements of global power transmission and distribution equipment and accessories thereof are increasing day by day, and the high-speed development of domestic power transmission and distribution equipment is pulled. However, the switch in China has excess capacity in middle and low-end products, and the high-end switch technology applied to the fields of aerospace and intelligent devices has not made breakthrough innovation.

Conventional switches have one or more electrical contacts with a movable conductive member between the contacts to control the switching on and off of the switch. With the development of the fields of micro-electromechanical systems and intelligent components, switches are mainly developed in the directions of high stability, strong reliability, strong anti-interference capability, low energy consumption, non-contact, modularization and the like.

The main disadvantages of the conventional switches in the prior art are: (1) short switch life, (2) poor module interchangeability, and (3) poor heat dissipation effect.

Disclosure of Invention

The technical problem to be solved by the embodiments of the present invention is to provide a non-contact magnetic control switch based on the self-assembly phenomenon of non-magnetic particles in a magnetic fluid. The switch can solve the problems of short service life, poor module interchangeability, easy aging and corrosion, poor heat dissipation effect, poor adaptability to severe working conditions and the like of the conventional switch.

In order to solve the technical problems, the embodiment of the invention provides a non-contact magnetic control switch based on the self-assembly phenomenon of non-magnetic particles in magnetic fluid, which comprises a switch end cover module, a switch cavity module, electrode wires, a base plate, a controllable electromagnet and a permanent magnet, wherein the switch cavity module comprises a cylindrical surface and a top surface, at least one pair of electrode wire connecting holes which are in one-to-one correspondence are formed between the cylindrical surface and the top surface, the electrode wires are arranged in the electrode wire connecting holes, the top surface is provided with a liquid injection hole, and the switch cavity module is filled with magnetic fluid mixed liquid; the switch end cover module is provided with switch cavity assembly holes which are arranged up and down, and the side surface of the switch end cover module is provided with at least one permanent magnet installation groove corresponding to the electrode wire connection hole on the cylindrical surface, the permanent magnet is fixedly installed in the permanent magnet installation groove, and the switch cavity module is assembled in the switch cavity assembly holes; the switch cavity module is fixedly arranged on the base plate, and the controllable electromagnet is arranged on the lower portion of the base plate and right opposite to the bottom of the switch cavity module.

The number of the permanent magnet mounting grooves is at least one pair, and the magnetic poles of the permanent magnets in the opposite surface directions are opposite.

The controllable electromagnet is arranged in the electromagnet base, and the electromagnet base is fixedly connected with the lower part of the base plate.

The magnetic fluid mixed liquid comprises non-magnetic conductive particles.

The non-magnetic conductive particles comprise one of silver powder particles, copper powder particles and multi-wall carbon nanotube powder, and the particle size of the particles is micron-sized.

The embodiment of the invention has the following beneficial effects: the invention has the advantages of high stability, strong reliability, strong anti-interference capability, low energy consumption, long service life and the like, can realize non-contact and high-heat-dissipation switch, and is suitable for severe working conditions.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural diagram of a switch chamber module;

FIG. 3 is a perspective schematic view of a switch chamber module;

FIG. 4 is a schematic structural diagram of a switch end cap module;

FIG. 5 is a perspective schematic view of a switch end cap module;

FIG. 6 is a schematic view of the construction of the base plate;

FIG. 7 is a schematic view of the electromagnet base;

FIG. 8 is a schematic diagram of the mixed liquid of magnetic fluid in the switch cavity module in the off state of the switch;

fig. 9 is a schematic diagram of the mixed liquid of the magnetic fluid in the switch cavity module in the switch closed state.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, a non-contact magnetic control switch based on a self-assembly phenomenon of non-magnetic particles in a magnetic fluid according to an embodiment of the present invention includes a switch end cover module 1, a switch cavity module 2, an electrode wire 3, a base plate 5, an electromagnet base 6, a controllable electromagnet 7, a permanent magnet, and a support 8.

As shown in fig. 2 and 3, the switch cavity module includes a cylindrical surface, a top surface and a bottom surface, four sets of electrode wire connecting holes 32 corresponding to each other one by one are arranged between the cylindrical surface and the top surface, the electrode wire connecting holes are communicated with the inner cavity, the top surface is provided with a liquid injection hole 22, the magnetic fluid mixed liquid is injected into the inner cavity through the liquid injection hole 22, the electrode wire 3 is installed in the electrode wire connecting holes 32, and the electrode wire 3 is preferably a platinum (silver) wire electrode wire.

As shown in fig. 4 and 5, the switch end cover module has switch cavity assembly holes 21 arranged up and down, and at least one permanent magnet installation groove 4 corresponding to the electrode wire connection hole on the cylindrical surface is arranged on the side surface, in this embodiment, the number of the permanent magnet installation grooves 4 is 4, and the permanent magnet installation grooves are symmetrically distributed. The permanent magnets are fixedly arranged in the permanent magnet mounting grooves, and the magnetic poles of the permanent magnets in the opposite surface directions are opposite.

Referring to fig. 7, the base plate 5 has a fixing hole in the middle for fixing the bottom fixing hole 25 of the switch cavity module, and a bracket fixing hole 58 around the base plate for mounting the bracket 8.

The electromagnet base 6 is fixedly connected with the bottom of the middle part of the base plate 5 through a fixing hole 56. A controllable electromagnet 7 is arranged in the electromagnet base 6. An electromagnet wiring hole 67 is formed in the electromagnet base, and a control line of the controllable electromagnet 7 penetrates through the electromagnet wiring hole 67.

The controllable electromagnet 7 is used for preventing the mixed liquid of the magnetic fluid from generating precipitation.

The mixed liquid of the magnetic fluid comprises non-magnetic conductive particles. The non-magnetic conductive particles comprise one of silver powder particles, copper powder particles and multi-wall carbon nanotube powder, and the particle size of the particles is micron-sized.

The mode of operation of the invention is as follows:

s1 designing the shape of the switch cavity as shown in FIG. 2, determining the positions and numbers of the switch cavity fixing hole 25, the conductive electrode wire connecting hole 32 and the liquid injection hole 22; designing the shape of the switch end cover is shown in fig. 4, and determining the positions and the number of the permanent magnet installation grooves 4 and the switch cavity fixing holes 21; designing the shape of the base plate to be a cuboid flat plate as shown in fig. 4, and determining the positions and the number of the bracket fixing holes 58 and the central fixing holes; the electromagnet base is shaped as shown in fig. 7 to determine the position of the electromagnet wiring hole 67.

S2, four round permanent magnets are fixed in the permanent magnet installation groove 4, the controllable electromagnet 7 is installed on the electromagnet base 6, and wires on the electromagnet penetrate out of the wiring hole 67 to be connected with an external control circuit.

S3 preparing magnetic fluid mixed liquid, weighing quantitative non-magnetic conductive particles by an electronic balance, mixing the particles with the insulating magnetic fluid, adding a proper amount of surfactant, keeping the uniform mixing state by ultrasonic oscillation, and filling the mixed liquid into a reagent bottle for later use.

S4 the platinum/silver wire electrode wire 3 is inserted into the lead wire connecting hole 32, the quantitative liquid injection pump injects the prepared magnetic fluid mixed liquid of S3 into the switch cavity along the liquid injection hole 22.

S5 the stud is used to pass through the fixing hole 25 at the bottom of the switch cavity, the center hole of the base plate and the fixing hole of the anti-coagulation device, the nut fixes the switch cavity above the base plate, the nut fixes the electromagnet base and the lower part of the base plate, and the two switch cavities 21 above and below the switch end cover 1 are assembled at the top and bottom of the switch cavity 2 respectively.

S6 after the modules are assembled, as shown in FIG. 1, the permanent magnet installation groove 4 and the cylindrical pole line connection hole are coaxial by rotating the switch end cover module 1, the switch is closed, and the state of nonmagnetic particles in the switch is shown in FIG. 8; the end cover module 1 of the switch is rotated to enable the permanent magnet installation groove and the pole line connection hole of the cylindrical surface to be non-coaxial, the switch is disconnected, and the state of nonmagnetic particles in the switch is shown in figure 9, so that the response time and the related performance of the switch are tested.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A non-contact magnetic control switch based on the self-assembly phenomenon of non-magnetic particles in magnetic fluid is characterized by comprising a switch end cover module, a switch cavity module, electrode wires, a base plate, a controllable electromagnet and a permanent magnet, wherein the switch cavity module comprises a cylindrical surface and a top surface, at least one pair of electrode wire connecting holes which are in one-to-one correspondence are formed between the cylindrical surface and the top surface, the electrode wires are arranged in the electrode wire connecting holes, a liquid injection hole is formed in the top surface, and a magnetic fluid mixed liquid is contained in the switch cavity module; the switch end cover module is provided with switch cavity assembly holes which are arranged up and down, and a permanent magnet installation groove corresponding to the electrode wire connection hole on the cylindrical surface is arranged on the side surface, the permanent magnet is fixedly installed in the permanent magnet installation groove, and the switch cavity module is assembled in the switch cavity assembly holes; the switch cavity module is fixedly arranged on the base plate, and the controllable electromagnet is arranged on the lower portion of the base plate and right opposite to the bottom of the switch cavity module.

2. The non-contact type magnetic control switch based on the self-assembly phenomenon of non-magnetic particles in magnetic fluid according to claim 1, wherein the number of the permanent magnet installation grooves is at least one pair, and the magnetic poles of the permanent magnets in the opposite direction are opposite to each other.

3. The non-contact type magnetic control switch based on the self-assembly phenomenon of non-magnetic particles in magnetic fluid according to claim 1, wherein the controllable electromagnet is arranged in an electromagnet base, and the electromagnet base is fixedly connected with the lower part of the base plate.

4. The non-contact magnetic control switch based on the self-assembly phenomenon of non-magnetic particles in magnetic fluid according to claim 1, wherein the mixed liquid of the magnetic fluid comprises non-magnetic conductive particles.

5. The non-contact magnetic control switch based on the self-assembly phenomenon of non-magnetic particles in magnetic fluid according to claim 4, wherein the non-magnetic conductive particles comprise one of silver powder particles, copper powder particles and multi-wall carbon nanotube powder, and the particle size of the non-magnetic conductive particles is in the micron order.