CN111504858A - Metal abrasive particle magnetic field anti-interference device - Google Patents
Metal abrasive particle magnetic field anti-interference device Download PDFInfo
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- CN111504858A CN111504858A CN202010275779.3A CN202010275779A CN111504858A CN 111504858 A CN111504858 A CN 111504858A CN 202010275779 A CN202010275779 A CN 202010275779A CN 111504858 A CN111504858 A CN 111504858A
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- shielding layer
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 80
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 9
- 239000002184 metal Substances 0.000 title claims abstract description 9
- 239000002245 particle Substances 0.000 title abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 30
- 229910052742 iron Inorganic materials 0.000 claims description 15
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 230000006698 induction Effects 0.000 claims description 7
- 239000010963 304 stainless steel Substances 0.000 claims description 6
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 6
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 4
- 230000008447 perception Effects 0.000 claims description 4
- 239000005011 phenolic resin Substances 0.000 claims description 4
- 229920001568 phenolic resin Polymers 0.000 claims description 4
- 229910001094 6061 aluminium alloy Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 13
- 230000035699 permeability Effects 0.000 description 10
- 230000004907 flux Effects 0.000 description 8
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- -1 iron-aluminum-iron Chemical compound 0.000 description 4
- 239000002923 metal particle Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0075—Magnetic shielding materials
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a metal abrasive particle magnetic field anti-interference device which comprises a sensing part, an inner shielding layer, a middle shielding layer and an outer shielding layer, wherein the sensing part is arranged in the inner shielding layer, the inner shielding layer is arranged in the middle shielding layer, and the middle shielding layer is arranged in the outer shielding layer. The invention can enhance the magnetic shielding effectiveness of the system by using a plurality of different shielding materials in combination; the internal magnetic field is protected while shielding the influence of external disturbing magnetic fields.
Description
Technical Field
The invention relates to the field of magnetic shielding, in particular to a metal abrasive particle magnetic field anti-interference device.
Background
The magnetic shielding technology is adopted by many precision instruments, and in the aspect of precision instruments, components including circuit boards, power circuits and the like in many precision instruments are easily affected by space electromagnetic waves to cause abnormal work, so that the influence of interference magnetic fields is reduced as much as possible by magnetic shielding. In the existing magnetic field structure shielding technology, a high-permeability material is used as a shielding layer, most of magnetic flux lines of an interference magnetic field enter and pass through the shielding layer, and the influence on the internal environment of the shielding layer is weakened. In addition, in some experiments that precise measurement needs to be performed by using weak variation of the magnetic field, for example, metal abrasive particles in oil are detected, since the variation of the detected magnetic field is very small, the influence of an external interference magnetic field needs to be shielded while the internal magnetic field is protected, and the internal magnetic field and the interference magnetic field cannot be protected and strengthened in the prior art.
Disclosure of Invention
The invention discloses a metal abrasive particle magnetic field anti-interference device, which aims to solve the problem of magnetic interference existing outside the existing detection system, protect an internal magnetic field and shield the influence of an external interference magnetic field.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a metal grit magnetic field jam-proof device, includes perception part, internal shield layer, well shielding layer and outer shielding layer, the perception part set up in the internal shield layer, the internal shield layer set up in the shielding layer, well shielding layer set up in the outer shielding layer.
As a further improvement of the scheme of the invention, the sensing component is of a solenoid structure made of phenolic resin, the inner shielding layer is an iron shell made of 304 stainless steel, the middle shielding layer is a hard aluminum shell made of 6061 aluminum alloy, and the outer shielding layer is a main shell made of 304 stainless steel.
As a further improvement of the scheme of the invention, the sensing component, the inner shielding layer, the middle shielding layer and the outer shielding layer are coaxially arranged and have the same length.
As a further improvement of the scheme of the invention, the sensing component is a solenoid structure consisting of an exciting coil, an induction coil and a movable magnetic core, and is designed based on the principle of mutual inductance so as to increase the magnetic flux generated when the metal particles pass through.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention can enhance the magnetic shielding effectiveness of the system by using a plurality of different shielding materials in combination;
2. the invention protects the internal magnetic field and shields the influence of the external interference magnetic field;
3. when the sensing component is arranged in the inner shielding layer, most of the magnetic force lines of the sensing component enter and pass through the inner shielding layer, so that the magnetic force lines can be scattered little, and the internal magnetic field is concentrated to form a conductive path for effective conduction; when the combined body of the sensing element and the inner shielding layer is arranged in the middle shielding layer, under the condition that the sizes of the shields are the same, the magnetic induction intensity of the iron-aluminum combined shield is much smaller than that of the iron shield at the same point, and the shielding effect of the iron-aluminum combined shield is far better than that of the iron shield; when the sensing component, the inner shielding layer and the middle shielding layer are arranged on the outer shielding layer, under the condition that the sizes of the shields are the same, the magnetic induction intensity of the iron-aluminum-iron combined shield is smaller than that of the iron-aluminum combined shield at the same point, and the shield formed by combining various iron-aluminum-iron shielding materials has a better shielding effect.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the structure of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, but not all 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.
As shown in fig. 1, the metal abrasive particle magnetic field interference preventer comprises a sensing component 1, an inner shielding layer 2, a middle shielding layer 3 and an outer shielding layer 4, wherein the sensing component 1 is disposed in the inner shielding layer 2, the inner shielding layer 2 is disposed in the middle shielding layer 3, and the middle shielding layer 3 is disposed in the outer shielding layer 4.
As a further improvement of the solution of the present invention, the sensing member 1 is a solenoid structure made of phenolic resin, the inner shielding layer 2 is an iron shell made of 304 stainless steel, the middle shielding layer 3 is a hard aluminum shell made of 6061 aluminum alloy, and the outer shielding layer 4 is a main shell made of 304 stainless steel.
As a further improvement of the scheme of the invention, the sensing component 1, the inner shielding layer 2, the middle shielding layer 3 and the outer shielding layer 4 are coaxially arranged and have the same length.
The sensing component 1 is a solenoid structure consisting of an exciting coil, an induction coil and a movable magnetic core, and is designed based on the mutual inductance principle so as to increase the magnetic flux generated when metal particles pass through.
In order to better understand the technical solution of the present invention, the properties of the components are set forth below:
① the skeleton of the sensing part 1 needs to adopt non-ferromagnetic material with good stability and small linear expansion coefficient, and at the same time, to keep good magnetic permeability, phenolic resin can meet the requirement of the sensing part 1. when the sensing part 1 is placed in an interference magnetic field, the sensing part 1 is very easy to be interfered by external magnetic field.
② the inner shield layer 2 has different magnetic permeability because the shield material is different, the higher the magnetic permeability is, the smaller the magnetic field intensity is, the better the shielding effectiveness is, when the magnetic permeability of the shield is increased, the magnetic resistance of the shield is reduced, most of the magnetic flux flows through the magnetic shield with small magnetic resistance, the magnetic flux density outside the shield is reduced, most of the magnetic force lines of the sensing component 1 enter and pass through the inner shield layer 2, and the scattering is less, so that the internal magnetic field is concentrated and forms a conductive path to conduct effectively.
③ under the condition of the same size of the shield, at the same point, the magnetic induction intensity of the iron-aluminum combined shield is much less than that of the iron shield, the shielding effect of the iron-aluminum combined shield far exceeds that of the iron shield, because the wave impedance of aluminum is far less than that of iron, the low frequency magnetic field is mostly reflected at the aluminum-iron interface, the low frequency magnetic field refracted into iron is mostly absorbed in the form of absorption loss in iron with high magnetic conductivity because of eddy current and skin effect, the magnetic flux refracted from iron to the external space is very small, thus the magnetic shielding effectiveness of the iron-aluminum combined magnetic low frequency magnetic field is greatly improved.
④ the outer shielding layer 4 is made of high magnetic permeability material iron, for the constant magnetic field, a high magnetic permeability material shielding case is put in the interference magnetic field, because of the high magnetic permeability of the material, the shielding case and the air medium compose a parallel magnetic circuit, because of the high magnetic permeability of the material, the relative magnetic permeability of the air medium is close to 1, and the relative magnetic permeability of the shielding case is at least thousands, the magnetic resistance of the air medium is much larger than that of the shielding case, most of the magnetic flux density line of the interference magnetic field will enter and pass through the shielding case, thereby achieving the purpose of shielding the constant magnetic field, only a few of the magnetic flux density line will not enter the shielding body, the shielding of the constant magnetic field is incomplete.
As a supplement to the embodiments of the present invention, a method for calculating the shielding effectiveness of the apparatus is provided:
wherein Z1＝Z5，Z1Wave impedance of the near field, Z2＝Z4Wave impedance of iron, Z3Is the wave impedance of aluminum; gamma ray1Is a propagation constant of electromagnetic waves in air, gamma2＝γ4Is the propagation constant of electromagnetic waves in iron, gamma3Is the propagation constant of electromagnetic waves in aluminum.
From the masking effectiveness expression SE＝-20lgT＝25.5166-i3.7541dB。
Under the condition that the size of the shielding body is the same, the magnetic induction intensity of the iron-aluminum-iron combined shielding body is smaller than that of the iron-aluminum combined shielding body at the same point, and the shielding body formed by combining various iron-aluminum-iron shielding materials has a better shielding effect.
The magnetic shielding material is high magnetic conductivity material iron and high electric conductivity material aluminum.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement, component separation or combination and the like made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (4)
1. The utility model provides a metal grit magnetic field jam-proof device, its characterized in that includes perception part, internal shield layer, well shielding layer and outer shielding layer, the perception part set up in the internal shield layer, the internal shield layer set up in the well shielding layer, well shielding layer set up in the outer shielding layer.
2. The device of claim 1, wherein the sensing member is a solenoid structure made of phenolic resin, the inner shielding layer is an iron case made of 304 stainless steel, the middle shielding layer is a hard aluminum case made of 6061 aluminum alloy, and the outer shielding layer is a main case made of 304 stainless steel.
3. The device of claim 1, wherein the sensing member, the inner shield layer, the middle shield layer and the outer shield layer are coaxially disposed and have the same length.
4. The device of claim 2, wherein the sensing member is a solenoid structure comprising three parts, namely an exciting coil, an induction coil and a movable magnetic core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010275779.3A CN111504858A (en) | 2020-04-09 | 2020-04-09 | Metal abrasive particle magnetic field anti-interference device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010275779.3A CN111504858A (en) | 2020-04-09 | 2020-04-09 | Metal abrasive particle magnetic field anti-interference device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111504858A true CN111504858A (en) | 2020-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010275779.3A Pending CN111504858A (en) | 2020-04-09 | 2020-04-09 | Metal abrasive particle magnetic field anti-interference device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113038813A (en) * | 2021-03-05 | 2021-06-25 | 云南电网有限责任公司电力科学研究院 | Shielding device for strong magnetic field |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2757139Y (en) * | 2004-12-21 | 2006-02-08 | 上海电动工具研究所 | Clamp type sensor for multilayer shield |
| JP2008288328A (en) * | 2007-05-16 | 2008-11-27 | Yokogawa Electric Corp | Magnetic shield device |
| CN101545958A (en) * | 2009-05-11 | 2009-09-30 | 吉林大学 | Bidirectional magnetic saturated time difference fluxgate sensor |
| JP2012033764A (en) * | 2010-07-30 | 2012-02-16 | Toshiba Corp | Electromagnetic shield sheet and method of producing the same |
| US20120249274A1 (en) * | 2011-04-04 | 2012-10-04 | Seiko Epson Corporation | Magnetic shield, program, and selection method |
| CN202757698U (en) * | 2012-06-27 | 2013-02-27 | 广东电网公司电力科学研究院 | Strong electromagnetic field-shielding temperature measuring probe |
-
2020
- 2020-04-09 CN CN202010275779.3A patent/CN111504858A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2757139Y (en) * | 2004-12-21 | 2006-02-08 | 上海电动工具研究所 | Clamp type sensor for multilayer shield |
| JP2008288328A (en) * | 2007-05-16 | 2008-11-27 | Yokogawa Electric Corp | Magnetic shield device |
| CN101545958A (en) * | 2009-05-11 | 2009-09-30 | 吉林大学 | Bidirectional magnetic saturated time difference fluxgate sensor |
| JP2012033764A (en) * | 2010-07-30 | 2012-02-16 | Toshiba Corp | Electromagnetic shield sheet and method of producing the same |
| US20120249274A1 (en) * | 2011-04-04 | 2012-10-04 | Seiko Epson Corporation | Magnetic shield, program, and selection method |
| CN202757698U (en) * | 2012-06-27 | 2013-02-27 | 广东电网公司电力科学研究院 | Strong electromagnetic field-shielding temperature measuring probe |
Non-Patent Citations (2)
| Title |
|---|
| 周辉: "磁屏蔽技术的仿真研究", 《中国优秀硕士学位论文全文数据库》, 15 March 2015 (2015-03-15), pages 43 * |
| 路宏敏: "《工程电磁兼容》", 西安电子科技大学出版社, pages: 124 - 126 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113038813A (en) * | 2021-03-05 | 2021-06-25 | 云南电网有限责任公司电力科学研究院 | Shielding device for strong magnetic field |
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