CN201248228Y

CN201248228Y - Shielded chamber for restraining low frequency magnetic field interference of magnetostatic field

Info

Publication number: CN201248228Y
Application number: CNU2008201144024U
Authority: CN
Inventors: 张睿霦; 何凡
Original assignee: BEIJING JINGDI MAGNET APPLIED INSTITUTE
Current assignee: BEIJING JINGDI MAGNET APPLIED INSTITUTE
Priority date: 2008-05-19
Filing date: 2008-05-19
Publication date: 2009-05-27
Anticipated expiration: 2018-05-19

Abstract

The utility model relates to a shielding chamber which can prevent static magnetic field interference and magnetic field interference and belongs to the technical field of space physics, in particular relates to the hard technology specialty of preventing electromagnetic interference. A frame adopts wood material, and in order to reduce the consumption of material, the inner and the outer faces of the frame are wrapped and inlaid by silicon-steel sheets alternately; seam lamination between adjacent silicon-steel sheets is 2 cm, the seam lamination adopts tapes for joint except for corners which adopt rivets, so expense is reduced and lattice structure and performance of raw materials are not disturbed; a door extends to form a door way so as to facilitate ventilation and reduce magnetic leakage; after the shielding chamber is wrapped by the silicon-steel sheets and aluminum plates, wood plates are arranged densely and are extruded solidly towards the direction of the wall cavity and a nonmetal material decoration layer is added to enable the whole silicon-steel sheets and the aluminum plates to form a closed structure, so as to be favorable for magnetic conductivity access and preventing metal from being oxidized. The shielding chamber builds a three dimensional space which has weak but even magnetic field and larger range.

Description

Suppress the shielded enclosure that the magnetostatic field low frequency magnetic field disturbs

Technical field

The utility model belongs to the space physics technical field, particularly suppresses the engineering specialty of electromagnetic interference.

Background technology

Metering to weak magnetic substance detects, to the demarcation of aerial, the face of land, performer navigation indication under water, to the quantitative research of some biologies under the action of a magnetic field, and even to these detect, the calibration of calibrating instrument, or the like, all need to possess the background environment that suppresses magnetostatic field, low frequency magnetic field interference.And magnetic field of the earth itself just has about 50000nT, more crucial is, the magnetic composition of crustal rock earth, the magnetic composition of human being's production life and all movable constructed tangible materials thereof, disorderly and unsystematic, the distribution that number is unordered of these magnetic compositions, cause our concrete working space environmental magnetic field gradient serious, the uniformity extreme difference, differing 1000nT in the regional environment magnetic field intensity of diameter 1m almost is universal phenomenon.In addition, earth magnetic field itself mainly is vertical component and north and south component, and east-west direction varies in different localities and the magnetic-field component of inequality also occurred for above-mentioned reasons.

Summary of the invention

For build a magnetic field not only a little less than but also evenly and the bigger three dimensions of scope, should set up that to suppress the shielded enclosure that magnetostatic field, low frequency magnetic field disturb be optimal selection.For a long time people to set up shielded enclosure forbidding once carrying, reason is to cost an arm and a leg, the utility model particularly outstanding feature is built in inhibition magnetostatic field, the low frequency magnetic field interference shielding chamber process exactly, reduce the consumption of material, utilize the shielded enclosure doorway to receive gateway, be beneficial to and ventilate and reduction " leakage field ", silicon steel sheet and aluminium sheet and the non-metallic material bed of material fit tightly and not only are beneficial to magnetism guiding access but also prevent burning.

The technical scheme that its technical problem that solves the utility model adopts is: the shielded enclosure main structural frame adopts wooden materials (referring to Fig. 1), 6 interfaces (4 enclosure wall walls, roof, ground) form the wall chamber of thickness 15cm, 10 layers of outdoor 6 bread silicon steel sheets (thick 0.3mm) (end, top overlaps totally 20 layers), 5 layers of indoor 6 edge silicon steel sheets (thick 0.3mm) (end, top overlaps totally 10 layers), outermost and interior 6 bread edge 1 layer of aluminium sheet (thick 2mm).(referring to Fig. 2) the key technical indexes of the present utility model has: 1. in this shielded enclosure, apart from a door end 50cm, apart from the whole spatial dimension of other 5 interfaces (wall, roof, ground) 10cm, the magnetic field three-component all＜200nT; 2. at above-mentioned spatial dimension, magnetic field gradient＜50nT/m ²3. in above-mentioned spatial dimension, low-frequency disturbance magnetic field≤0.5nT; 4. the load-bearing of shielded enclosure ground is not less than 200kg/m ²

The beneficial effects of the utility model are that the circulation of employing whole piece silicon steel sheet plates, and has both reduced " leakage field " in the splicing, reduces the consumption of material in the splicing again; Splicing between the silicon steel sheet is mainly used adhesive tape but not the nail riveting, even the nail riveting is complete non-magnetic metal material, but it penetrates silicon steel sheet and must upset raw-material lattice structure and produce the slit simultaneously, and the mechanical shock of nail riveting process can cause the STRESS VARIATION of material, influence performance, what value was mentioned again is that the price of wastage in bulk or weight adhesive tape is not as good as 1% of nail riveting price by statistics; The doorway is received gateway and can be reduced " leakage field " and form the doorway and open wide, and is convenient to ventilation, regulates temperature if desired, can utilize the gateway apparatus for establishing, avoids additional magnetisable material in shielded enclosure; After silicon steel sheet and aluminium sheet bag (edge) are finished, 6 inside and outsides of shielded enclosure totally 11 bread edge layer except that pasting ground layer, all need the wood based panel dense arrangement real to wall cavity direction extruding riveting, add the nonmetallic materials decorative layer again, make whole silicon steel sheet and aluminium sheet structure form sealing, this just makes silicon steel sheet more fit tightly, and is beneficial to magnetism guiding access; Prevent the metal material oxidation with air is isolated.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further specified

Fig. 1 is a wooden frame schematic diagram of the present utility model.

Fig. 2 is a shielded enclosure vertical section schematic diagram.

Fig. 3 is a circulation bag silicon steel sheet schematic diagram

Fig. 4 is the shielded enclosure schematic appearance.

Fig. 5 is that circulation plates silicon steel sheet and reserves schematic diagram at ground.

1. shielded enclosure wood frame among the figure, 2. shielded enclosure is received gateway, 3. shield the locular wall chamber, 4. outer decorative layer, 5. extruding plank, 6. aluminium sheet is 1 layer, 7. outsourcing silicon steel sheet (10 layers of vertical shops, 10 layers of horizontal shops, compound 20 layers)+vertical circulation plates silicon steel sheet (10 layers in this face), 8. wooden frame (thick 15cm), 9. in edge silicon steel sheet (5 layers of vertical shops, 5 layers of horizontal shops, compound 10 layers), 10. aluminium sheet is 1 layer, 11. extruding planks, 12. inner trim panels 13. cross-ties prefaces: wide (B)-Gao (C)-wide (B)-Gao (C) circulation plates silicon steel sheet, 14. splicing laminates 2cm, 15. corners are with the nail riveting, and 16. seam crossings are with adhesive tape (from top to bottom clinging along stitching), 17. longitudinal layer preface: long (A)-Gao (C)-length (A)-Gao (C) circulation plates silicon steel sheet, 18. shielded enclosure floor space position line, 19. vertical circulation silicon steel sheets are reserved, and 20. horizontal circulation silicon steel sheets are reserved, 21. ground scope position line, overlapping in length and breadth 20 layers of 22. silicon steel sheets.

Embodiment

1. select to set up the shielded enclosure room, its area is bigger 3 times than shielded enclosure area at least, and its interior clear height is 1.3 times of shielded enclosure at least.

2. prolong 20cm than expansion around the shielded enclosure construction area and determine the ground scope;

3. make damp-proof layer in this ground scope, its upper berth insulation offset plate then, again on this offset plate integration face around in the 20cm that contracts determine the shielded enclosure floor space;

4. silicon steel sheet and the aluminium sheet that pre-preparation of cutting out is used to circulate and plates, by crisscross rule, according to the above-mentioned 1.3 shielded enclosure floor spaces of delimiting, the shop just is reserved in one or both sides (referring to Fig. 5) respectively with preparing to be used for the silicon steel sheet that vertical plane and end face plate in proportion-layer by layer;

5. in the location of spreading with regard to the floor space that goes up most the strict recovery in plane shielded enclosure of base silicon steel layer;

6. make up wooden shielded enclosure framework in above-mentioned floor space scope, referring to " agent structure of summary of the invention ", referring to Fig. 1, the doorway is extended into gateway, the inner height width of gateway is consistent with gate size, and its length is not less than 23% of shielded enclosure length.；

Above-mentioned 1.4 reserved plate silicon steel sheet, plate by from top to bottom sequence, establish shielded enclosure long (Am), wide (Bm), high (Cm); Cut out silicon steel sheet (keeping former width) length=2Am+2Cm, vertical circulation is around shielded enclosure length-height-length-high face circulation bag (edge); Cut out silicon steel sheet (keeping former width) length=2Bm+2Cm, horizontal circulation, around shielded enclosure wide-high-wide-high face circulation plates (referring to Fig. 3).Shielded enclosure for 6 bodies, circulation plates in the process, seam (because of raw material width is limit) is arranged between adjacent per two silicon steel sheets, for not " leakage field ", seam must laminate, as long as keep vertical in this circulation bag (edge) technology, laminates width 2cm and gets final product, key be laminate connecing of seam piece together close except that only turning with the nail riveting, other large tracts of land all adopts adhesive tape adhesion (referring to Fig. 3)

8. indoor 6, also plate with reference to above-mentioned 1.7 methods, what it and outdoor bread were inlayed main difference is: bottom surface-both sides vertical plane-end face circulation, can accomplish without any letup;

9. 5 of outermosts and interior 6 plate 1 layer of aluminium sheet respectively, can be without round-robin method, and top, the not longitudinal and transverse repetition in bottom surface;

10. after silicon steel sheet and aluminium sheet bag (edge) are finished, 6 inside and outsides of shielded enclosure totally 11 bread edge layer except that pasting ground layer, all need the wood based panel dense arrangement real, add the nonmetallic materials decorative layer again, make whole silicon steel sheet and aluminium sheet structure form sealing to wall cavity direction extruding riveting;

11. inside and outside apparent decorative layer green material, pure wood floors are adopted in the flooring, whole apparent decoration forbidding magnetic metal material.

Claims

1. a shielded enclosure is that six faces surround the cavity cube, and it is characterized in that: the shielded enclosure skeleton adopts pure wooden joinery and its construction, and its inside and outside staggered the plating of the whole piece silicon steel sheet by wide 90cm～100cm formed.

2. shielded enclosure according to claim 1 is characterized in that: plate overlapping 2cm between inside and outside the silicon steel sheet, it is fixing all to adopt adhesive tape to fit, and shielded enclosure corner adopts the nail rivet clasp fixed.

3. shielded enclosure according to claim 1, it is characterized in that: the doorway extends into gateway, and the inner height width of gateway is consistent with gate size, and its length is not less than 23% of shielded enclosure length.

4. shielded enclosure according to claim 1 is characterized in that: inside and outside of the shielded enclosure hexahedron that silicon steel sheet plates, totally 11 top layers except that pasting ground layer cover by the wood based panel of nail riveting dense arrangement.