JP2006269662A - Magnetic shield wall and magnetic shield room - Google Patents
Magnetic shield wall and magnetic shield room Download PDFInfo
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- JP2006269662A JP2006269662A JP2005084390A JP2005084390A JP2006269662A JP 2006269662 A JP2006269662 A JP 2006269662A JP 2005084390 A JP2005084390 A JP 2005084390A JP 2005084390 A JP2005084390 A JP 2005084390A JP 2006269662 A JP2006269662 A JP 2006269662A
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Abstract
Description
本発明は磁気ノイズを遮断して、ある空間を磁気的に清浄な状態に保つことを目的とした、強磁性体を用いた磁気シールド技術に関する。 The present invention relates to a magnetic shield technique using a ferromagnetic material for the purpose of blocking magnetic noise and keeping a certain space magnetically clean.
透磁率の高い磁性体を用いた磁気シールド技術は一般的な技術である。その構成は、例えば、特許文献1、特許文献2に記載されているように、板状の磁性体で対象の空間を囲むことが基本となっており、磁性体を複合化することや、板の接合部分からの漏洩をカバーなどで防止することによって、シールド性能の向上を図っている。
A magnetic shield technique using a magnetic material having a high magnetic permeability is a general technique. For example, as described in
その際、板状磁性体の面は、磁気シールドルームの壁面と平行となっている。上述の特許文献1および特許文献2に開示された方法では、材料特性から期待される様なシールド性能がなかなか得られず、また、空間を磁性体で密閉する構造となるため、空気や光の透過性がないという問題点があった。
At that time, the surface of the plate-like magnetic body is parallel to the wall surface of the magnetic shield room. According to the methods disclosed in
特許文献3および特許文献4には空気や光を透過させるシールド体の記述がある。しかし、特許文献3および特許文献4に開示された技術だけで優れたシールド性能を得るには不十分である。また特許文献5には、電磁鋼板で閉磁路を形成することが開示されているが、シールド壁面と板状磁性体の面は平行であり、空気や光を透過させることのできる構造には至らない。
Patent Document 3 and
本発明者らは、空気や光の透過性を持ちながら優れた磁気シールド性能をもつ磁気シールド技術を提供することを目的として、単数または複数の板状磁性体からなる複数個の磁性体要素を、長手方向の端部を接近させて、磁気回路として閉じた磁性体フレームを形成し、その磁性体フレームを板状磁性体板厚方向に間隔をおいて複数配置する方法をすでに提案している(特願2003-72119)。
しかしながら、実際のシールドルームやシールド構造には、ドアや窓が存在し、磁性体フレームが閉じた磁気回路を形成できない場合がある。そこからの磁束漏洩は全体の磁気シールド性能を劣化させるので、前記発明者らが提案した技術においても、対応策が必要である。
For the purpose of providing a magnetic shielding technology having excellent magnetic shielding performance while having air and light permeability, the present inventors have provided a plurality of magnetic elements made of one or more plate-like magnetic bodies. Have already proposed a method of forming a closed magnetic frame as a magnetic circuit by bringing the ends in the longitudinal direction close to each other and arranging a plurality of the magnetic frames at intervals in the plate-shaped magnetic plate thickness direction. (Japanese Patent Application 2003-72119).
However, in an actual shield room or shield structure, there are doors and windows, and there are cases where a magnetic circuit in which the magnetic frame is closed cannot be formed. Since magnetic flux leakage from there deteriorates the overall magnetic shield performance, countermeasures are also required in the technique proposed by the inventors.
本発明は、ドアや窓などが存在するために磁性体フレームを構成する磁性体端部同士の接合に不連続部が生じ磁性体フレームが閉じた磁気回路を形成できない状態についても、空気や光の透過性を持ちながら優れた磁気シールド性能を有する磁気シールド技術を提供することを目的としている。 The present invention also applies to air and light even in a state where a magnetic circuit in which the magnetic frame is closed due to the presence of doors, windows, etc., resulting in discontinuities in the joining of the magnetic material ends constituting the magnetic frame. An object of the present invention is to provide a magnetic shielding technique having excellent magnetic shielding performance while having a high permeability.
本発明は、シールド壁内の磁性体フレーム内に不連続部があった場合に、その位置の壁表面に、不連続部より大きい板状磁性体を壁面と平行に配置することを基本としている。 In the present invention, when there is a discontinuous portion in the magnetic body frame in the shield wall, a plate-like magnetic body larger than the discontinuous portion is arranged in parallel with the wall surface on the wall surface at that position. .
具体的には下記の通りである。
(1)閉じた磁気回路を構成する複数の軟磁性体フレームが対象の空間を包囲する磁気シールド構造を構成する磁気シールド壁であって、前記磁気シールド壁の中に板状磁性体が法線方向を壁の法線方向と直角に設置されており、板状磁性体の長さ方向端部が他の板状磁性体と接合されずに不連続部が存在する場合に、前記不連続部位置の外側あるいは内側の壁表面の一方もしくは両方に、不連続部より大きい板状磁性体を壁面と平行に配置したことを特徴とする磁気シールド壁。
(2)板状磁性体が電磁鋼板であることを特徴とする(1)に記載の磁気シールド壁。
(3)板状磁性体が方向性電磁鋼板であり、磁性体フレームの磁束の流れる方向に圧延方向を揃えて設置することを特徴とする(2)に記載の磁気シールド壁。
(4)(1)〜(3)のいずれかの項に記載のシールド壁を少なくとも1つ含む磁気シールドルーム。
Specifically, it is as follows.
(1) A magnetic shield wall constituting a magnetic shield structure in which a plurality of soft magnetic frames constituting a closed magnetic circuit surround a target space, and a plate-like magnetic body is normal to the magnetic shield wall When the direction is set perpendicular to the normal direction of the wall, and the discontinuous portion exists when the end in the longitudinal direction of the plate-like magnetic body is not joined to another plate-like magnetic body, the discontinuous portion A magnetic shield wall characterized in that a plate-like magnetic body larger than the discontinuous portion is arranged in parallel to the wall surface on one or both of the wall surface outside or inside the position.
(2) The magnetic shield wall according to (1), wherein the plate-like magnetic body is an electromagnetic steel plate.
(3) The magnetic shield wall according to (2), wherein the plate-like magnetic body is a grain-oriented electrical steel sheet, and the rolling direction is aligned with the direction in which the magnetic flux of the magnetic body frame flows.
(4) A magnetic shield room including at least one shield wall according to any one of (1) to (3).
以下に本発明を詳細に説明する。 The present invention is described in detail below.
本発明は、軟磁性体で構成された磁性体フレームが閉じた磁気回路を構成し、複数の磁性体フレームが対象の空間を包囲する磁気シールド構造において、これを構成する磁気シールド壁および磁気シールドルームに関するものである。磁性体フレームを、間隔をおいて設置することによって、その磁性体フレーム同士の間隙を空気や光が透過することができる。磁性体フレームは、板状磁性体もしくは曲げ加工を受けた板状磁性体をそれらの端部同士を重ね合わせまたは突き合わせ接合して形成される。その際、板状磁性体は一枚ずつ、あるいは複数枚を積層したものを用いることができる。 The present invention relates to a magnetic shield structure in which a magnetic frame made of a soft magnetic material forms a closed magnetic circuit, and a plurality of magnetic material frames surrounds a target space. It is about the room. By installing the magnetic frames at intervals, air or light can pass through the gaps between the magnetic frames. The magnetic body frame is formed by overlapping or butting and joining the end portions of a plate-like magnetic body or a plate-like magnetic body that has been subjected to a bending process. At that time, the plate-like magnetic bodies can be used one by one or by laminating a plurality of sheets.
ところが、窓やドアなどの部分では、磁性体フレームを磁気的に閉じた状態で固定することができないために、磁性体フレームの中間に磁気回路の不連続部を作らざるを得ない場合が生じる。本発明は、このような磁気シールド壁や磁気シールドルームにおいて、前記磁気回路の不連続部位置の壁表面に、板状磁性体を壁と平行に配置し、磁気シールド性能を保持することを特徴とする。 However, in parts such as windows and doors, the magnetic frame cannot be fixed in a magnetically closed state, and therefore a discontinuous part of the magnetic circuit must be created in the middle of the magnetic frame. . The present invention is characterized in that in such a magnetic shield wall or magnetic shield room, a plate-like magnetic body is arranged in parallel with the wall on the wall surface at the position of the discontinuous portion of the magnetic circuit to maintain the magnetic shield performance. And
図1に磁気回路の不連続部分を拡大して例を示す。(a)は不連続部の手当ては全くしていない状態で、不連続部からの漏洩が著しく、シールド壁あるいはシールドルームのシールド性能は劣化する。一方(b)、(c)、(d)は本発明の例であるが、これらの図に示すように板状磁性体を配置することによって、不連続部からの磁束漏洩を防止し、優れた磁気シールド性能を得ることができる。板状磁性体は、壁の外側表面に配置しても内側表面に配置しても良く、また両側に配置してもかまわない。このような手当てをすることによって、窓やドアがあっても、優れたシールド性能を持つ磁気シールド壁あるいは磁気シールドルームを得ることができる。 FIG. 1 shows an example of an enlarged discontinuous portion of a magnetic circuit. (A) is a state in which the discontinuous portion is not treated at all, and leakage from the discontinuous portion is remarkable, and the shielding performance of the shield wall or the shield room is deteriorated. On the other hand, (b), (c), and (d) are examples of the present invention, but by disposing a plate-like magnetic body as shown in these drawings, leakage of magnetic flux from the discontinuous portion is prevented and excellent. Magnetic shield performance can be obtained. The plate-like magnetic body may be disposed on the outer surface or the inner surface of the wall, or may be disposed on both sides. By taking such care, a magnetic shield wall or a magnetic shield room having excellent shielding performance can be obtained even if there are windows and doors.
上記磁気シールド壁、磁気シールドルームの磁性体としては軟磁性材料を用いるが、好適な材料として電磁鋼板を挙げることができる。透磁率が高く安価であるからである。また方向性電磁鋼板を用い、フレームの磁束の流れる方向に圧延方向を一致させることによって、さらに優れた磁気シールド性能を得ることができる。 A soft magnetic material is used as the magnetic body of the magnetic shield wall and the magnetic shield room, and an electromagnetic steel sheet can be used as a suitable material. This is because the magnetic permeability is high and inexpensive. Further, by using a grain-oriented electrical steel sheet and making the rolling direction coincide with the direction in which the magnetic flux of the frame flows, a further excellent magnetic shield performance can be obtained.
図2に示すようなMRIの磁気シールドルームを模したモデルを作製した。モデルルーム内側のサイズは幅2.8m×長さ3.5m×高さ1.7mであり、ルーム内には電磁石を設置した。ガントリー面に相当する壁D面の内側に5mTの磁場が印加される条件で電磁石を励磁し、部屋の外部に漏洩する磁束密度を測定してルームのシールド性能の評価を行った。シールドモデルルームの基本構成は以下の通りである。50mm幅の電磁鋼板で、内寸2.8m×3.5mの磁気シールドフレームを構成し垂直方向に150mmピッチで10段重ねた。磁性体フレームを構成する電磁鋼板はA、B、D面では12枚、C面では6枚を積層使用した。さらにC、D面では、垂直方向にもフレームを150mmピッチで設置した。フレーム内電磁鋼板はC面6枚積層、D面12枚積層とした。天井と床ではそれぞれ、方向性電磁鋼板12枚をC面と垂直方向に圧延方向を一致させ全面に貼った。コーナーでの電磁鋼板の接合は、面同士が板厚方向に接合する形式とした。天井、床面での電磁鋼板の接合も、短冊状電磁鋼板の両端を90°曲げし、面接合を確保した。 A model simulating an MRI magnetic shield room as shown in FIG. 2 was prepared. The inside size of the model room was 2.8m wide x 3.5m long x 1.7m high, and an electromagnet was installed in the room. The shield performance of the room was evaluated by exciting the electromagnet under the condition that a magnetic field of 5mT was applied inside the wall D surface corresponding to the gantry surface, and measuring the magnetic flux density leaking outside the room. The basic configuration of the shield model room is as follows. A magnetic shield frame with an inner dimension of 2.8m x 3.5m was constructed with 50mm wide electrical steel sheet, and 10 layers were stacked vertically at a pitch of 150mm. 12 magnetic steel sheets constituting the magnetic frame were laminated on the A, B, and D surfaces, and 6 sheets were used on the C surface. In addition, on the C and D planes, frames were also installed at a 150 mm pitch in the vertical direction. The electromagnetic steel sheets in the frame were laminated with 6 C surfaces and 12 D surfaces. On the ceiling and floor, 12 grain-oriented electrical steel sheets were pasted on the entire surface with the rolling direction aligned with the C plane. The electromagnetic steel sheets were joined at the corners in such a manner that the surfaces were joined in the thickness direction. For joining the electrical steel sheets on the ceiling and floor, both ends of the strip-shaped electrical steel sheets were bent by 90 ° to ensure surface joining.
A面は図3に示すようなドアを模擬した開口部を設置した。開口部(ドア)周辺の状況を図4に示す。図4(a)は本発明例であり、ドアと壁の隙間に磁性体フレームの不連続部が存在するが、その位置の壁の外側表面に無方向性電磁鋼板1枚を配置した。無方向性電磁鋼板は幅50mm、長さ1.5mであり、ドア部に固定され、ドアの開け閉めが可能である。図4(b)も本発明例であるが、壁の中の磁性体フレームは、窓を迂回しながら、シールドルーム全体では、閉じた磁気回路を持つ。しかしながらドア内の板状磁性体は壁の磁性体フレームとは接合されておらず、不連続部が存在しているが、(a)と同様に50mm幅、1.5m長さの無方向性電磁鋼板1枚を空隙の壁の外側表面に配置した。図4(c)は比較例で、ドアと壁の隙間に存在する磁性体フレームの不連続部にはなんら手当てを施していない。 On the A side, an opening simulating a door as shown in FIG. 3 was installed. The situation around the opening (door) is shown in FIG. FIG. 4 (a) is an example of the present invention, and there is a discontinuous portion of the magnetic frame in the gap between the door and the wall, but one non-oriented electrical steel sheet was placed on the outer surface of the wall at that position. The non-oriented electrical steel sheet has a width of 50 mm and a length of 1.5 m, is fixed to the door, and can be opened and closed. FIG. 4B is an example of the present invention, but the magnetic frame in the wall has a closed magnetic circuit in the entire shield room while bypassing the window. However, the plate-like magnetic body in the door is not joined to the magnetic body frame on the wall, and there are discontinuous parts, but as in (a), the non-directional electromagnetic of 50 mm width and 1.5 m length One steel plate was placed on the outer surface of the void wall. FIG.4 (c) is a comparative example and does not give any treatment to the discontinuous part of the magnetic body frame existing in the gap between the door and the wall.
以上各例の、ドアの幅中央部表面からの磁場の距離依存性を図5に示す。高さ1m地点の値である。本発明で磁場漏洩が非常に小さいことがわかる。 FIG. 5 shows the distance dependence of the magnetic field from the surface of the center of the door width in each example. It is the value at 1m height. It can be seen that magnetic field leakage is very small in the present invention.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009111031A (en) * | 2007-10-26 | 2009-05-21 | Nippon Steel Engineering Co Ltd | Magnetic shield device, magnetizing device, and manufacturing method of magnetic shield device |
EP2217049A1 (en) * | 2007-11-19 | 2010-08-11 | Takenaka Corporation | Magnetic shield body and magnetic shield room |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07273484A (en) * | 1994-03-31 | 1995-10-20 | Nippon Steel Corp | Magnetic shielding device |
JP2002164686A (en) * | 2000-11-27 | 2002-06-07 | Kajima Corp | Method and device for reed screen type magnetic shielding |
WO2004084603A1 (en) * | 2003-03-17 | 2004-09-30 | Kajima Corporation | Open magnetic shield structure and its magnetic frame |
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- 2005-03-23 JP JP2005084390A patent/JP2006269662A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07273484A (en) * | 1994-03-31 | 1995-10-20 | Nippon Steel Corp | Magnetic shielding device |
JP2002164686A (en) * | 2000-11-27 | 2002-06-07 | Kajima Corp | Method and device for reed screen type magnetic shielding |
WO2004084603A1 (en) * | 2003-03-17 | 2004-09-30 | Kajima Corporation | Open magnetic shield structure and its magnetic frame |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009111031A (en) * | 2007-10-26 | 2009-05-21 | Nippon Steel Engineering Co Ltd | Magnetic shield device, magnetizing device, and manufacturing method of magnetic shield device |
EP2217049A1 (en) * | 2007-11-19 | 2010-08-11 | Takenaka Corporation | Magnetic shield body and magnetic shield room |
EP2217049A4 (en) * | 2007-11-19 | 2013-07-31 | Takenaka Corp | Magnetic shield body and magnetic shield room |
US8531185B2 (en) | 2007-11-19 | 2013-09-10 | Takenaka Corporation | Magnetic shield body and magnetic shielded room |
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