CN112180308A

CN112180308A - Magnetic field detection device

Info

Publication number: CN112180308A
Application number: CN202011075700.9A
Authority: CN
Inventors: 不公告发明人
Original assignee: Jinhua Fuan Photoelectric Technology Co Ltd
Current assignee: Jinhua Fuan Photoelectric Technology Co Ltd
Priority date: 2020-10-09
Filing date: 2020-10-09
Publication date: 2021-01-05

Abstract

The invention provides a magnetic field detector which comprises a substrate, a shell, a first iron yoke, a magnetorheological elastomer, a magnet, a second iron yoke, a third iron yoke, a fourth iron yoke and a fifth iron yoke, wherein the shell, the magnetorheological elastomer, the magnet, the second iron yoke, the third iron yoke, the fourth iron yoke and the fifth iron yoke are arranged on the substrate, a closed cavity is formed by the substrate, the shell and the first iron yoke, the cavity is in a cuboid shape, the first iron yoke is one side face of the cavity, the magnetorheological elastomer fills the cavity, one end of the first iron yoke is fixedly connected with the magnet outside the cavity, the other end of the magnet is fixedly connected with one end of the second iron yoke, a gap is formed between one end of the third iron yoke and the other end of the second iron yoke, the other end of the third iron yoke is fixedly connected with one end of the fourth iron yoke, the other end of the fourth iron yoke is fixedly connected with the fifth iron yoke, the fifth iron yoke is parallel to the. The invention has the advantage of wide range and can be applied underwater and other complex environments.

Description

Magnetic field detection device

Technical Field

The invention relates to the technical field of magnetic field detection, in particular to a magnetic field detection device.

Background

Magnetic field detection relates to a number of fields in engineering. The traditional magnetic field detection technology has narrow measuring range and is not beneficial to the application in complex environments such as underwater and the like.

Disclosure of Invention

To solve the above problems, the present invention provides a magnetic field detecting device comprising: the magnetorheological damper comprises a substrate, and a shell, a first iron yoke, a magnetorheological elastomer, a magnet, a second iron yoke, a third iron yoke, a fourth iron yoke and a fifth iron yoke which are arranged on the substrate, wherein the substrate, the shell and the first iron yoke form a closed cavity, the cavity is cuboid, the first iron yoke is one side surface of the cavity, the magnetorheological elastomer fills the cavity, one end of the first iron yoke is fixedly connected with the magnet outside the cavity, the other end of the magnet is fixedly connected with one end of the second iron yoke, a gap is formed between one end of the third iron yoke and the other end of the second iron yoke, the other end of the third iron yoke is fixedly connected with one end of the fourth iron yoke, the other end of the fourth iron yoke is fixedly connected with the fifth iron yoke, the fifth iron yoke is parallel to the first iron yoke, and a gap is formed between the side surface of the fifth iron yoke and the side surface of the first iron yoke.

Further, an elastic material is provided at the bottom of the first iron yoke.

Still further, the width of the gap is less than 10 microns.

Further, the other end of the fifth iron yoke is spaced from the magnet by a distance of more than 1 cm.

Further, the magnetorheological elastomer is soft magnetic particles.

Further, the soft magnetic particles are arranged in a chain shape.

Further, the axis of the chain is along the normal direction of the surface of the first iron yoke.

Further, the area of the fifth iron yoke is smaller than that of the first iron yoke.

Further, the magnet is an electromagnet and the substrate is a non-magnetic material.

Further, the first iron yoke and the fifth iron yoke have protruded arc surfaces at both sides of the gap.

The invention has the beneficial effects that: the invention provides a magnetic field detector which comprises a substrate, a shell, a first iron yoke, a magnetorheological elastomer, a magnet, a second iron yoke, a third iron yoke, a fourth iron yoke and a fifth iron yoke, wherein the shell, the magnetorheological elastomer, the magnet, the second iron yoke, the third iron yoke, the fourth iron yoke and the fifth iron yoke are arranged on the substrate, a closed cavity is formed by the substrate, the shell and the first iron yoke, the cavity is in a cuboid shape, the first iron yoke is one side face of the cavity, the magnetorheological elastomer fills the cavity, one end of the first iron yoke is fixedly connected with the magnet outside the cavity, the other end of the magnet is fixedly connected with one end of the second iron yoke, a gap is formed between one end of the third iron yoke and the other end of the second iron yoke, the other end of the third iron yoke is fixedly connected with one end of the fourth iron yoke, the other end of the fourth iron yoke is fixedly connected with the fifth iron yoke, the fifth iron yoke is parallel to the. In the present invention, the magnet, the second iron yoke, the gap, the third iron yoke, the fourth iron yoke, the fifth iron yoke, and the gap constitute a magnetic circuit. When the magnetic field to be measured is applied to the magnetorheological elastomer, the magnetorheological elastomer expands to extrude the first iron yoke, so that the width of the gap is changed, and the magnetic field at the gap is changed. The invention realizes the measurement of the magnetic field to be measured by detecting the magnetic field at the gap. When the magnetic field to be measured is stronger, the cavity can be designed to be smaller, the gap or the gap can be arranged to be wider, and the strength of the magnet can be arranged to be weaker, so that the magnetic field at the gap can be reduced; when the magnetic field to be measured is weaker, the chamber can be designed to be larger, the gap or the gap can be set to be smaller, and the strength of the magnet can be set to be stronger, so that the magnetic field at the gap can be enhanced. Therefore, the invention can realize wide-range magnetic field measurement. In addition, the invention is based on the magnetic loop, and is convenient to be applied under water and other severe environments.

The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic view of a magnetic field detection apparatus.

Fig. 2 is a schematic view of still another magnetic field detection apparatus.

In the figure: 1. a housing; 2. a first iron yoke; 3. a magnetorheological elastomer; 4. a magnet; 5. a second iron yoke; 6. a third iron yoke; 7. a gap; 8. a fourth iron yoke; 9. and a fifth iron yoke.

Detailed Description

To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description of the embodiments, structural features and effects of the present invention will be made with reference to the accompanying drawings and examples.

Example 1

The invention provides a magnetic field detection device. As shown in fig. 1, the magnetic field detecting device includes a substrate, and a housing 1, a first iron yoke 2, a magnetorheological elastomer 3, a magnet 4, a second iron yoke 5, a third iron yoke 6, a fourth iron yoke 8, and a fifth iron yoke 9 disposed on the substrate. The base, the housing 1 and the first yoke 2 constitute a closed chamber. The chamber is cuboid, and the first iron yoke 2 is one side surface of the chamber. That is, the base is the bottom surface of the chamber, the first yoke 2 is one side surface of the chamber, and the housing 1 refers to the other side surface and the top surface of the chamber. The magnetorheological elastomer 3 fills the cavity. In application, the area of the first iron yoke 2 can be reduced, the area of the first iron yoke 2 is smaller than the side area of the chamber, other parts of the surface of the first iron yoke 2 are replaced by the material of the shell, and the chamber is sealed. The substrate is a non-magnetic material, such as silicon dioxide, and the substrate does not conduct a magnetic field. The shell 1 is made of rigid materials, and the shell 1 is not easy to deform under the action of force. Outside the chamber, one end of the first yoke 2 is fixedly connected with a magnet 4, and the other end of the magnet 4 is fixedly connected with one end of a second yoke 5. The magnet 4 is an electromagnet to generate a magnetic field, and the strength of the magnetic field or the strength of the electromagnet is adjustable. A gap 7 is formed between one end of the third iron yoke 6 and the other end of the second iron yoke 5, the other end of the third iron yoke 6 is fixedly connected with one end of a fourth iron yoke 8, the other end of the fourth iron yoke 8 is fixedly connected with a fifth iron yoke 9, the fifth iron yoke 9 is parallel to the first iron yoke 2, and a gap is formed between the side surface of the fifth iron yoke 9 and the side surface of the first iron yoke 2.

In the present invention, the magnet 4, the second iron yoke 5, the gap 7, the third iron yoke 6, the fourth iron yoke 8, the fifth iron yoke 9, and the gap constitute a magnetic circuit. The magnet 4 generates a magnetic field, thereby generating a magnetic field at the slit 7. When the magnetic field to be measured is applied to the magnetorheological elastomer 3, the magnetorheological elastomer 3 expands to extrude the first iron yoke 2, so that the width of the gap is changed, and the magnetic field at the gap 7 is changed. The invention realizes the measurement of the magnetic field to be measured by detecting the magnetic field at the gap 7. When the magnetic field to be measured is stronger, the cavity design can be smaller, the gap 7 or the gap can be wider, and the strength of the magnet 4 can be weaker, so that the magnetic field at the gap 7 can be reduced; when the magnetic field to be measured is weak, the chamber can be designed to be large, the gap 7 or the gap can be set to be small, and the strength of the magnet 4 can be set to be strong, so that the magnetic field at the gap 7 can be enhanced. Therefore, the invention can realize wide-range magnetic field measurement. And aiming at different magnetic field strengths, the magnetic field detection device is convenient to adjust. In addition, the invention is based on the magnetic loop, and is convenient to be applied under water and other severe environments.

Still further, the width of the gap is less than 10 microns. Thus, when the width of the gap is varied, the magnetic field in the magnetic circuit varies more, and the magnetic field at the gap 7 varies more, thereby achieving a more sensitive detection of the magnetic field.

Further, the other end of the fifth iron yoke 9 is spaced from the magnet 4 by more than 1 cm. As a result, the magnetic resistance of the gap between the fifth iron yoke 9 and the magnet 4 is large, and most of the magnetic flux in the magnetic circuit follows the magnetic circuit. Therefore, when the width of the gap is changed, the magnetic field at the slit 7 is changed more, improving the sensitivity of magnetic field detection.

Furthermore, the magnetorheological elastomer 3 is soft magnetic particles, the soft magnetic particles are arranged in a chain shape, and the axis of the chain shape is along the normal direction of the surface of the first iron yoke 2. Therefore, under the action of the magnetic field to be detected, the magnetorheological elastomer 3 enables the first iron yoke 2 to deform more, so that the width of the gap is changed more, the magnetic field at the gap 7 is changed more, and high-sensitivity detection of the magnetic field is realized.

Example 2

In addition to embodiment 1, an elastic material is provided on the bottom of the first iron yoke 2. That is, on the chamber side where the first yoke 2 is located, the elastic material is disposed at the position of the first yoke 2 close to the base, and the base, the elastic material, and the first yoke 2 are sequentially arranged from bottom to top. Thus, the restraining force of the substrate to the first iron yoke 2 when the first iron yoke 2 is deformed is prevented, so that the first iron yoke 2 is deformed more, the width of the gap is changed more, the magnetic field at the gap 7 is changed more, and the sensitivity of magnetic field detection is improved.

Example 3

In example 1, the area of the fifth iron yoke 9 is smaller than that of the first iron yoke 2. In this way, the magnetic field at the gap in the magnetic circuit is more concentrated, and as the width of the gap changes, the reluctance at the gap changes more, and thus the magnetic field at the gap 7 changes more, thereby improving the sensitivity of magnetic field detection.

Example 4

On the basis of embodiment 1, as shown in fig. 2, the first iron yoke 2 and the fifth iron yoke 9 have protruded arc surfaces on both sides of the gap. In this way, the magnetic field at the gap in the magnetic circuit is more concentrated, and as the width of the gap changes, the reluctance at the gap changes more, and thus the magnetic field at the gap 7 also changes more, thereby improving the sensitivity of magnetic field detection.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims

1. A magnetic field detection device, comprising: a substrate, a shell arranged on the substrate, a first iron yoke, a magnetorheological elastomer, a magnet, a second iron yoke, a third iron yoke, a fourth iron yoke and a fifth iron yoke, the substrate, the shell and the first iron yoke form a closed cavity, the cavity is cuboid-shaped, the first iron yoke is one side surface of the cavity, the magnetorheological elastomer fills the cavity, one end of the first iron yoke is fixedly connected with the magnet outside the cavity, the other end of the magnet is fixedly connected with one end of the second iron yoke, a gap is arranged between one end of the third iron yoke and the other end of the second iron yoke, the other end of the third iron yoke is fixedly connected with one end of the fourth iron yoke, the other end of the fourth iron yoke is fixedly connected with the fifth iron yoke, the fifth iron yoke is parallel to the first iron yoke, and a gap is formed between the side face of the fifth iron yoke and the side face of the first iron yoke.

2. The magnetic field detection device according to claim 1, characterized in that: and an elastic material is arranged at the bottom of the first iron yoke.

3. The magnetic field sensing device of claim 2, wherein: the width of the gap is less than 10 microns.

4. A magnetic field detection device according to claim 3, characterized in that: the distance between the other end of the fifth iron yoke and the magnet is more than 1 cm.

5. The magnetic field sensing device according to any one of claims 1 to 4, wherein: the magnetorheological elastomer is soft magnetic particles.

6. The magnetic field sensing device of claim 5, wherein: the soft magnetic particles are arranged in a chain shape.

7. The magnetic field sensing device of claim 6, wherein: the chain axis is along a normal direction of the first iron yoke surface.

8. The magnetic field sensing device of claim 7, wherein: the area of the fifth iron yoke is smaller than that of the first iron yoke.

9. The magnetic field sensing device of claim 8, wherein: the magnet is an electromagnet, and the substrate is made of a non-magnetic material.

10. The magnetic field sensing device of claim 9, wherein: the first and fifth yokes have protruded arc surfaces on both sides of the gap.