CN201947600U - Magnetic field shielding device of magnetizing magnetic material - Google Patents
Magnetic field shielding device of magnetizing magnetic material Download PDFInfo
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- CN201947600U CN201947600U CN2011200091549U CN201120009154U CN201947600U CN 201947600 U CN201947600 U CN 201947600U CN 2011200091549 U CN2011200091549 U CN 2011200091549U CN 201120009154 U CN201120009154 U CN 201120009154U CN 201947600 U CN201947600 U CN 201947600U
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- magnetic field
- shielding
- shielding device
- magnet
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Abstract
A magnetic field shielding device of a magnetizing magnet body comprises two shielding layers. The two shielding layers are similar in the shape and nested together, and a space is kept between the two shielding layers and filled with a non-magnetic conducting material. The two shielding layers are made of magnetic conducting material such as ferromagnetic material, silicon steel material and the like, and each shielding layer has certain volume and an opening formed on one side. The shielding device is economical and convenient, and has effectively reduced the cost. The remnant magnetic flux leaked in a cavity is shielded again so as to fade the strong magnetic field to a very low level, even to zero, meeting the requirements of air way transportation and other magnetic fields shielding.
Description
Technical field
The utility model is relating to the magnetic field shielding device of magnetic magnetic material.
Background technology
After magnet magnetizes around the space produce stronger magnetostatic field, if do not shield, in the air transportation process, can impact flight.For guaranteeing flight safety, need the magnetic article are carried out safety detection.IATA902 international air transport agreement (International Air Transport Association) regulation, any magnetic field intensity at the tested article surface 2.1m of distance place should just can be used as general cargo less than 0.159A/m (0.002Gs) and transport unrestricted.Therefore the magnet behind the magnetic before transportation, must shield earlier.Under some other situation, also need to carry out magnetic field shielding before use facing to the magnetic magnet.
The most frequently used magnetic shielding device is to utilize the ferromagnetic material of high magnetic conductivity to make the magnetostatic field that radome is shielding the generation of magnetic magnet.After in the external magnetic field that magnet produces, putting into the iron plate of high permeability, because the permeability of ferromagnetic material is than big several thousand times of the permeability of air, overwhelming majority magnetic fields are concentrated in the ferromagnetic circuit, and promptly the magnetic line of force is from the magnets N utmost point, flow back into the S utmost point of magnet in the iron plate wall again.Magnetic field just can not exhale like this, does not have magnetic field outside the space of shielding basically, thereby reaches the purpose of magnetic shielding.The material shield effectiveness that permeability is high more is good more, and high permeability materials commonly used have soft iron, silicon steel etc., so magnetic shielding is named ferro-magnetic shield again.
We get final product ordinary circumstance with common iron plate armoured magnetic field.But when the magnetic field that needs shielding is very strong, only can not reach the shielding requirements of air transportation during as the magnetic field of the NdFeB magnet of shielding well with the single-layer shield material.
Summary of the invention
The purpose of this utility model provides the screening arrangement that a kind of magnet magnetic field behind the magnetic, promptly chooses the purpose that suitable material and rational structure reach armoured magnetic field, and the simple easy operating of screening arrangement, and Financial cost is low.
The magnetic field shielding device of magnetic magnetic material of the present utility model is characterized in that: this screening arrangement is made up of appearance similar and the two-layer screen that nests together, and certain space is arranged between two screens, is filled with non-magnet material in this space.
Preferably, described two screens are made by permeability magnetic material, and it is shaped as has certain volume and opening is simultaneously arranged.
Preferably, have on the described opening one with the flat board made from the identical material of screen.
Preferably, described permeability magnetic material comprises ferromagnetic material, silicon steel material.
Preferably, described opening is not on the direction of orientation in magnetic magnetic material magnetic field.
What this device adopted is multilayer screen, is about to a screen and puts into another screen, leaves a fixed gap between two screens, and not only economy but also convenient can effectively reduce cost.It can mask the residual magnetic flux amount of leaking in the cavity again, makes high-intensity magnetic field decay to very low even is zero, can satisfy air transportation requirement and other magnetic field shielding needs.
Description of drawings
Fig. 1 is a screening arrangement schematic diagram of the present utility model.
Wherein: 1---magnet, 2---internal shield, 3---outer shielding layer, 4---non-magnet material, 5---flat board.
Embodiment
Execution mode of the present utility model is specific as follows: this magnetic field shielding device is made up of appearance similar and the two-layer screen that nests together, and certain space is arranged between two screens, is filled with non-magnet material in this space.These two screens all are to be made by permeability magnetic material, comprise ferromagnetic material, silicon steel material etc., and it is shaped as has certain volume and opening is simultaneously arranged.As shown in Figure 1.
How many shapes that can shield magnet as required determine the shape and the size of screen with, common cuboid more commonly.At first make opening is arranged at a top cuboid as internal shield 2, need the magnet 1 of shielding to be placed on internal shield inside with permeability magnetic material.Doing a top with permeability magnetic material again has opening, volume ratio internal shield big and can hold the outer shielding layer 3 of internal shield, and certain space is arranged between the interior outer shielding layer, fills non-magnet material 4 in this space.The flat board made with an identical material with screen at last 5 is sealed opening.
What this device adopted is multilayer screen, is about to a screen and puts into another screen, leaves a fixed gap between two screens, can fill any non-magnet material in the space supports, as add certain plastic foam, not only economy but also convenient can effectively reduce cost.It can mask the residual magnetic flux amount of leaking in the cavity again, makes high-intensity magnetic field decay to very low even is zero, to satisfy the needs of air transportation requirement and other magnetic field shieldings.
Embodiment
NdFeB magnet behind the magnetic to be delivered is aligned to rectangular shape, as shown in Figure 1, measures the Surface field of magnet along the direction of orientation of magnet with teslameter, and reading is 520Gs.Magnet is directly put in the packing case without shielding, and the magnetic field intensity that measure case face this moment (apart from the about 20mm of magnet) obtains is 60Gs.
According to theoretical magnetic field intensity and distance square be inversely proportional to and the magnetic field intensity at 2.1 meters of international air transport agreement regulation calculates less than 0.002Gs, therefore magnetic field intensity apart from the about 20mm of magnet place should not adopt the packing of any shielding measure can not satisfy the air transportation requirement less than 22Gs.
According to the size of magnet, a cuboid that can hold an opening of lower magnet is done with the individual layer iron plate that thickness is about 1mm by elder generation, and magnet is put into cuboid, and this moment, opening was not on the direction of orientation of magnets magnetic fields.Along the direction of orientation of magnet surface measurements magnetic field once more on the same position of iron plate outside, this moment, magnetic field intensity was 20Gs then.Find out that thus high permeability material can play certain armoured magnetic field effect, but can not mask fully.
Do a cuboid-sheath bigger and that can hold following above-mentioned cuboid in above-mentioned cuboid outside with the iron plate of same thickness again, and between two-layer iron plate, dose Poly dragon foam.Use again in the second layer iron plate outside teslameter along the magnet direction of orientation in same position surface measurements magnetic field, this moment, magnetic field intensity was zero.The flat board of making of same iron plate at last suitable with opening size sealed up opening (when with two-layer shielding, as long as it is just passable to seal the screen of outside), prevents possible remaining leakage field.
Certainly this device can also carry out when reality is used in this order: do the outer shielding layer of an and opening identical with the packing case shape in the same side in the packing case inboard of magnet to be delivered with individual layer iron plate, and then do an and opening identical in the same side but smaller No. one internal shield with the outer shielding layer shape, be put into the outer shielding layer the inside, and between two screens, fill Poly dragon foam.Magnet behind the magnetic is put into the internal shield the inside, and the opening of chest and screen is not on the direction of orientation of magnet at this moment.The flat board that the size that same iron plate is made is suitable with the outer shielding layer opening is sealed up opening at last.Promptly can aviation deliver after sealing packing case.
Air transportation is higher to the shielding requirements of magnet, and the screening arrangement that can satisfy the air transportation requirement can adapt to the magnetic field shielding needs of other situations.
Claims (5)
- One kind the magnetic field shielding device of magnetic magnetic material, it is characterized in that: this screening arrangement is made up of appearance similar and the two-layer screen that nests together, and certain space is arranged between two screens, is filled with non-magnet material in this space.
- 2. magnetic field shielding device as claimed in claim 1 is characterized in that: described two screens are made by permeability magnetic material, and it is shaped as has certain volume and opening is simultaneously arranged.
- 3. magnetic field shielding device as claimed in claim 2 is characterized in that: the flat board that has an identical material with screen to make on the described opening.
- 4. magnetic field shielding device as claimed in claim 2 is characterized in that: described permeability magnetic material comprises ferromagnetic material, silicon steel material.
- 5. magnetic field shielding device as claimed in claim 2 is characterized in that: described opening is not on the direction of orientation in magnetic magnetic material magnetic field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200091549U CN201947600U (en) | 2011-01-13 | 2011-01-13 | Magnetic field shielding device of magnetizing magnetic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200091549U CN201947600U (en) | 2011-01-13 | 2011-01-13 | Magnetic field shielding device of magnetizing magnetic material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201947600U true CN201947600U (en) | 2011-08-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200091549U Expired - Lifetime CN201947600U (en) | 2011-01-13 | 2011-01-13 | Magnetic field shielding device of magnetizing magnetic material |
Country Status (1)
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| CN (1) | CN201947600U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106549539A (en) * | 2016-12-26 | 2017-03-29 | 株洲九方装备股份有限公司 | A kind of magnetic field shielding device of permanent magnetism rotor axis mechanical processing |
| CN106737202A (en) * | 2016-12-26 | 2017-05-31 | 株洲九方装备股份有限公司 | A kind of machining magnetic field shielding method and device containing permanent magnet workpiece |
| CN106793728A (en) * | 2016-12-13 | 2017-05-31 | 清华大学 | For the screening arrangement of Mobile biological electric signal amplifier |
| CN108491107A (en) * | 2015-12-29 | 2018-09-04 | 广东欧珀移动通信有限公司 | A kind of mobile terminal |
| CN108683758A (en) * | 2015-12-29 | 2018-10-19 | 广东欧珀移动通信有限公司 | A kind of folding terminal |
| CN112786324A (en) * | 2021-01-29 | 2021-05-11 | 北京双杰电气股份有限公司 | Low-voltage direct-current circuit breaker arc extinguish chamber and circuit breaker |
-
2011
- 2011-01-13 CN CN2011200091549U patent/CN201947600U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108491107A (en) * | 2015-12-29 | 2018-09-04 | 广东欧珀移动通信有限公司 | A kind of mobile terminal |
| CN108683758A (en) * | 2015-12-29 | 2018-10-19 | 广东欧珀移动通信有限公司 | A kind of folding terminal |
| US10539981B2 (en) | 2015-12-29 | 2020-01-21 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Foldable terminal |
| CN108491107B (en) * | 2015-12-29 | 2021-11-02 | Oppo广东移动通信有限公司 | Mobile terminal |
| CN106793728A (en) * | 2016-12-13 | 2017-05-31 | 清华大学 | For the screening arrangement of Mobile biological electric signal amplifier |
| CN106793728B (en) * | 2016-12-13 | 2019-03-01 | 清华大学 | Screening arrangement for Mobile biological electric signal amplifier |
| CN106549539A (en) * | 2016-12-26 | 2017-03-29 | 株洲九方装备股份有限公司 | A kind of magnetic field shielding device of permanent magnetism rotor axis mechanical processing |
| CN106737202A (en) * | 2016-12-26 | 2017-05-31 | 株洲九方装备股份有限公司 | A kind of machining magnetic field shielding method and device containing permanent magnet workpiece |
| CN106549539B (en) * | 2016-12-26 | 2019-01-29 | 株洲九方装备股份有限公司 | A kind of magnetic field shielding device of permanent magnetism rotor axis mechanical processing |
| CN112786324A (en) * | 2021-01-29 | 2021-05-11 | 北京双杰电气股份有限公司 | Low-voltage direct-current circuit breaker arc extinguish chamber and circuit breaker |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110824 |