JPH02136128A - Door for magnetic shield room - Google Patents
Door for magnetic shield roomInfo
- Publication number
- JPH02136128A JPH02136128A JP63288769A JP28876988A JPH02136128A JP H02136128 A JPH02136128 A JP H02136128A JP 63288769 A JP63288769 A JP 63288769A JP 28876988 A JP28876988 A JP 28876988A JP H02136128 A JPH02136128 A JP H02136128A
- Authority
- JP
- Japan
- Prior art keywords
- door
- magnetic
- hollow part
- magnetic fluid
- room
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 33
- 239000011553 magnetic fluid Substances 0.000 claims abstract description 37
- 239000000696 magnetic material Substances 0.000 claims abstract description 11
- 230000005611 electricity Effects 0.000 claims 1
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 5
- 239000010935 stainless steel Substances 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 241001137251 Corvidae Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002996 emotional effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000002747 voluntary effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は、磁気共１乃１珍断装置等のような強磁場発生
装置を１投置する室の扉に関し、４シこ扉部分からｒａ
Ｊ！ｌが漏洩しないようにしたものである。Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a door of a room in which one strong magnetic field generating device such as a magnetic one-to-one cutting device is placed. ra
J! This is to prevent l from leaking.
「従来の技術」
最近、病院では磁気共１烏診断装置（以下ＭＨＩと記載
する）を１没置するようになっているが、病院ではペー
スメーカを装着した患者が居るとともに、コンピュータ
等のように磁気で悪影響を受ける機器が多数ある。その
ためＭＨＩを設置する室には、：ｆＳ３図に示すように
漏洩磁場を外部に漏らさない１１的で、室の４面あるい
は６面に純鉄のような強磁性体による磁気シールドＡを
設けたり、外来電波による影響を遮断する１１的で室の
６面に電波シールドＢを設けている。``Prior Art'' Recently, hospitals have begun to install magnetic hygroscopic diagnostic equipment (hereinafter referred to as MHI), but in addition to patients with pacemakers, hospitals are also There are many devices that are adversely affected by magnetism. Therefore, the room where the MHI is installed must be equipped with a magnetic shield A made of ferromagnetic material such as pure iron on the 4th or 6th side of the room to prevent leakage magnetic fields from leaking to the outside, as shown in Figure fS3. A radio wave shield B is installed on six sides of the room to block the influence of external radio waves.
磁気シールドＡや電波シールドＢを設けた室でも、その
室の出入口の部分などに隙間があると、両シールド効果
は著しく低下してしまう、そのため、ＭＨＩ等を設置し
た室の隙間を、全溶接、全ハング付等により磁気漏洩の
隙間をなくすようにしている。また室の出入１１等の開
［１部にも、ステンレス板や電波シールドカラスやフィ
ンガーコンタクト等により’ｉｆｆ波シールドを施して
いる。しかし、ｒ磁気シールドに関しては屯い磁性材を
使うため、出入口のｍ部分を磁気シールド処理すること
が難しい。ＭＲＩ室の出入口は、、！８者をのせたスト
レノチャーや治療機器が出入するため、大きさが例えば
幅１４００ｍｍ、高さ２１００ｍｍ程度になり、扉も大
きなものが必要になる。このように大きな扉を磁に１体
で作ると、磁石により引っ張られて開閉が極めて困難に
なる。そのため、やむを得ずＪＪには磁気シールドを施
さないのが実状である。Even in a room where magnetic shield A and radio wave shield B are installed, if there is a gap at the entrance or exit of the room, the effectiveness of both shields will be significantly reduced. Therefore, the gap in the room where MHI etc. is installed is completely welded. , with full hangs, etc., to eliminate gaps for magnetic leakage. In addition, 'IF wave shielding is applied to the openings such as the entrance/exit 11 of the room using stainless steel plates, radio wave shield crows, finger contacts, etc. However, since a thick magnetic material is used for the r magnetic shield, it is difficult to magnetically shield the m portion of the entrance/exit. The entrance to the MRI room is...! Since a strainer carrying eight people and treatment equipment come in and out, the size is, for example, about 1,400 mm in width and 2,100 mm in height, and a large door is required. If such a large door were made from a single magnet, it would be pulled by the magnet and would be extremely difficult to open and close. Therefore, in reality, it is unavoidable that magnetic shielding is not applied to JJ.
「発明が解決しようとする課題」
従来のＭＲＩ室のように扉に磁気シールドを施ネない場
合には、その扉の部分で磁場の大きな漏洩が生じる。す
なわち第３図に示すように、 １．５Ｔ（テスラ）のＭ
ＨＩを設置した場合、ベースメーカ！Ａ若者のケ人禁１
１−の管理区域、かつコンピュータ設置の［１安になる
５Ｇ （ガウス）ラインが扉部分から大きく拡がり、管
理４−の問題が大きかった。``Problems to be Solved by the Invention'' When the door is not magnetically shielded like in a conventional MRI room, a large amount of magnetic field leaks at the door. That is, as shown in Figure 3, M of 1.5T (Tesla)
When installing HI, base manufacturer! A Young man's ban 1
The 5G (Gauss) line in the controlled area of 1- and where the computer was installed spread widely from the door, creating a major problem for control 4-.
また扉部分をＭＨＩからできるだけ離し、距離減衰を利
用して漏洩磁場を小さく押えようとすると、扉の位置の
制約を受け、建築計画−Ｌの問題が生じる。さらにＭＲ
Ｉ室の磁場外１１ｉに大きな歪が生じ、ＭＨＩの画像に
歪を生じさせないためのシムコイルによる調整が大変で
あった。Furthermore, if an attempt is made to keep the leakage magnetic field small by placing the door as far away from the MHI as possible and utilizing distance attenuation, the problem of Architectural Plan-L will occur due to the restriction of the position of the door. Further MR
A large distortion occurred in the outside magnetic field 11i of the I room, and it was difficult to make adjustments using shim coils to prevent distortion from occurring in the MHI image.
そこで本発明は、ＭＲＩ室の扉に磁気シールドを施すと
ともに、その開閉も容易に行えるようにすることを目的
とする。Therefore, an object of the present invention is to provide a magnetic shield to the door of an MRI room and also to make it easy to open and close the door.
［課題を解決するための手段」
本発明の磁気シールドルーム用扉は、扉を非磁性材によ
り中空状に形成し、扉の中空部に流入「１と流出［］と
を設けて、その流入「】と磁性流体収容槽とを途中にポ
ンプを有する管路で連通ずる。また中空部の流出口と磁
性流体収容槽とを管路で連通ずるとともに、その管路に
おける流出口近くに開閉ｊＦを設けて、磁性流体を適宜
扉の中空部に充填できるようにした。[Means for Solving the Problems] The door for a magnetically shielded room of the present invention has a door formed in a hollow shape from a non-magnetic material, an inlet ``1'' and an outlet ``2'' provided in the hollow part of the door. ] and the magnetic fluid storage tank are communicated by a pipe line with a pump in the middle.Also, the outlet of the hollow part and the magnetic fluid storage tank are communicated by a pipe line, and an opening/closing valve is connected near the outlet of the pipe line. is provided so that the hollow part of the door can be appropriately filled with magnetic fluid.
扉の中空部へ磁性流体を自動的に充填、流出させるには
、流出口に連通ずる前記開閉ｊｔを電磁開閉弁で構成し
、中空部の流入口とポンプとを連通ずる管路途中に電磁
開閉弁を設けて、２つの電磁開閉ブｒとポンプとを制御
する電気的制御装置を設ければよい。In order to automatically fill and flow out the magnetic fluid into the hollow part of the door, the opening/closing jt communicating with the outflow port is configured with an electromagnetic on-off valve, and an electromagnetic valve is installed in the middle of the pipe connecting the inflow port of the hollow part and the pump. An on-off valve may be provided, and an electric control device may be provided to control the two electromagnetic on-off valves r and the pump.
なお磁性流体とは、水や鉱油Ｔに粒径 １００〜２００
人（オングストローム）の磁粉を分散させたコロイド溶
液であり、微粒子であるため保磁力も極めて小きく、配
合の調整で透磁率を」−げてやれば磁気シールドとして
適したものになる。In addition, magnetic fluid is water or mineral oil T with a particle size of 100 to 200.
It is a colloidal solution in which angstrom magnetic particles are dispersed, and because it is a fine particle, the coercive force is extremely small, and if the magnetic permeability is increased by adjusting the composition, it becomes suitable as a magnetic shield.
「作用」
」−記ト段の磁気シールドルーム用扉において、ｆノ？
が閉じたときには、ポンプを駆動して磁性流体収容槽か
ら扉の魔人１■を介して中空部内に磁性流体を流入させ
て満たせば、その充填された磁性流体により扉の磁気シ
ールドが保たれる。なお、この場合、流出［」近くの開
閉弁は閉じられている。"Function" - In the door for the magnetically shielded room listed in step 5, f no?
When the door is closed, if the pump is driven to flow the magnetic fluid from the magnetic fluid storage tank into the hollow space through the door's demon 1■ and fill it, the filled magnetic fluid will maintain the magnetic shielding of the door. It will be done. In this case, the on-off valve near the outflow is closed.
Ｊ、＋？を開ける場合には、流１１冒−■近くの開閉ゴ
「を開１］すれば、扉の中空部内の磁性流体は自重によ
り流出して磁性流体収容槽に流出する。扉から磁性流体
が流出すれば、ｒＪ？は軽くなりしかも非磁性材のみで
構成されるので磁力で引っ張られることもなく、扉は容
易に開くことができる。J,+? When opening the door, open the opening/closing door near Flow 11, and the magnetic fluid in the hollow part of the door will flow out due to its own weight and flow into the magnetic fluid storage tank.The magnetic fluid will flow out from the door. Then, rJ? becomes lighter, and since it is made of only non-magnetic material, it is not pulled by magnetic force, and the door can be opened easily.
「実施例」 本発明の実施例を第１．２図により説明する。"Example" An embodiment of the present invention will be explained with reference to FIG. 1.2.
磁気」Ｆ、１鳥、珍断装置（ＭＨＩ）等のように強磁場
を発生する装置を、磁気シールド壁Ａと電波シールド９
Ｂとを設けた室内に設置するため、室の扉を次の構成
により磁気シールドさせた。A device that generates a strong magnetic field, such as a magnetism device (MHI), is connected to a magnetic shield wall A and a radio wave shield 9.
In order to install the device in a room with room B, the door of the room was magnetically shielded with the following configuration.
１１へ１ は、ステンレス板等の非磁性材を接合してＩ
Ｉ空状に形成され、その中空部２内に磁性流体が充ｊｂ
１されるようになっている。Ｊ７？、 ｌの上部に中空
部２に連通ずる流入［］３が設けられ、扉１の下部に中
′；−１部に連通する流出口４が、没けられる。To 11, 1 is made by joining a non-magnetic material such as a stainless steel plate.
I is formed in a hollow shape, and the hollow part 2 is filled with magnetic fluid.
1. J7? An inlet 3 communicating with the hollow part 2 is provided in the upper part of the door 1, and an outlet 4 communicating with the inner part 1 is sunk in the lower part of the door 1.
扉ｌの中空部２に充填させるための磁性流体は前記室か
ら少し尊れた位置であって流出口４より下方位置の磁性
流体収容槽５に収容される。磁性流体収容槽５は、途中
にポンプ６を有する管路７により中空部２の流入口３に
連通され、さらに管路７における流入１】３に近い位置
に電磁開閉ブｒ８が設けられる。電磁開閉弁８とポンプ
６とはマイコン９により制御されるようになっており、
電磁開閉弁８を開状態にするとともにポンプ６を駆動す
ることにより、中空部２内に磁性流体を流入し、中空部
２内が磁性流体で満たされるとポンプ６を停止１＝ し
て電磁開閉（ｆ’８を閉じさせるようになっている。The magnetic fluid to be filled into the hollow part 2 of the door 1 is stored in a magnetic fluid storage tank 5 located slightly away from the chamber and below the outlet 4. The magnetic fluid storage tank 5 is communicated with the inlet 3 of the hollow portion 2 through a conduit 7 having a pump 6 in the middle, and an electromagnetic switch r8 is provided in the conduit 7 at a position close to the inflow 1]3. The electromagnetic on-off valve 8 and the pump 6 are controlled by a microcomputer 9.
By opening the electromagnetic on-off valve 8 and driving the pump 6, magnetic fluid flows into the hollow part 2. When the inside of the hollow part 2 is filled with magnetic fluid, the pump 6 is stopped and the electromagnetic opening/closing is performed. (It is designed to close f'8.
ｌｊ？、 ｌは開閉されるので、管路７と流入口３とは
常に連通ｙれるものではなく、管路７の端部をｍ、 ｌ
の周囲の室の開「１周縁に設けたステンレスｌやｌＯの
部分に配置させる。そして管路７の端部に伸縮管１１を
設けて、閉じたＪ）ｉｔの中′Ｉ；？部２内に磁性流体
を流入するときに伸縮管１１を伸長して、流入１１３内
に挿入させられるようになっている。なお伸′ｆｒｄ管
１１は１例えば油圧シリンダを伸縮させることにより伸
縮されるようになっており、それはマイコン９により制
御されるようになっている。lj? , l are opened and closed, so the pipe line 7 and the inlet port 3 are not always in communication, and the ends of the pipe line 7 are connected to m and l.
Place the stainless steel l or lO provided on the periphery of the opening of the chamber around the chamber.Then, install the telescopic tube 11 at the end of the conduit 7, and close it. When the magnetic fluid flows in, the telescopic pipe 11 is extended and inserted into the inflow 113.The telescopic pipe 11 can be extended or contracted by, for example, extending or contracting a hydraulic cylinder. This is controlled by the microcomputer 9.
扉１の中空部２の流出ＩＪ４には伸縮管１１と同様に伸
縮する伸縮管１２が設けられ、この伸ｉ［？Ｉ２は扉ｌ
側に設けられ、収４ｈ時には扉１内に収納されるように
なっている。伸縮管１２には゛ｌ’ｔｉ：磁開閉弁１３
が設けられ、その′重心開閉ｊｒ１３は中空部２内の磁
性流体を流出させるときのみ、マイコン９により開放さ
れるようになっている。また扉１が閉じた状態での伸ｍ
管１２の下方には、ステンレス枠１０に伸縮管１１が
伸長したときに通り抜ける通孔が設けられ、その通孔の
下に受樋１４が設けられる。受樋１４は、管路１５を介
して前記磁性流体収容槽５に連通され、中空部２から流
出する磁性流体を磁性流体収容槽５に流入させられるよ
うになっている。The outflow IJ4 of the hollow part 2 of the door 1 is provided with a telescoping pipe 12 that expands and contracts similarly to the telescoping pipe 11, and this expansion i[? I2 is door l
It is provided on the side, and is stored inside the door 1 when it is used for 4 hours. The telescopic pipe 12 has a magnetic opening/closing valve 13.
The center of gravity opening/closing jr 13 is opened by the microcomputer 9 only when the magnetic fluid in the hollow portion 2 is to be discharged. Also, elongation m with door 1 closed
Below the tube 12, a through hole is provided in the stainless steel frame 10 through which the telescopic tube 11 passes when extended, and a receiving gutter 14 is provided below the through hole. The receiving gutter 14 is communicated with the magnetic fluid storage tank 5 through a conduit 15, and is configured to allow the magnetic fluid flowing out from the hollow portion 2 to flow into the magnetic fluid storage tank 5.
なお、１．＋ｉ！、 ｌの［二部に中空部２に通じる空
気孔１６が設けられ、中空部２内の磁性流体をスムーズ
に流出できるようになっている。また、中空部３内の心
情流体はその自毛で流出させることができるが迅速にあ
るいは強制的に流出させるため管路１５の途中に新たな
ポンプを１没けて流出させるようにしてもよい。In addition, 1. +i! , An air hole 16 communicating with the hollow part 2 is provided in the second part of the l, so that the magnetic fluid in the hollow part 2 can flow out smoothly. Further, the emotional fluid in the hollow part 3 can be made to flow out by its own hair, but in order to make it flow out quickly or forcefully, a new pump may be inserted in the middle of the conduit 15 to make it flow out. .
また前記実施例では扉の中空部２における流入１１３
と流出１１４とを扉の支軸とは別個に設けて伸縮管１１
． １２を使用して中空部２と外部の管路とを接続させ
たが、扉の支軸をパイプ状にして、そのパイプを中空部
２と連通させれば、伸縮管を使用することなく外部の管
路をパイプ状支軸を介して中空部２に連通させることが
できる。Further, in the embodiment, the inflow 113 in the hollow part 2 of the door
and the outflow 114 are provided separately from the support shaft of the door.
．． 12 was used to connect the hollow part 2 and the external conduit, but if the support shaft of the door is made into a pipe and that pipe is communicated with the hollow part 2, the external conduit can be connected without using a telescopic pipe. can be made to communicate with the hollow part 2 via the pipe-shaped support shaft.
「発明の効果」
本発明の磁気シールドルーム川Ｊｊｔでは、ＪｕｌをＪ
１磁性材により中空状に形成して磁性流体をその中空部
に充填あるいは流出させることができるので１１空部に
磁性流体を充填させておけば、Ｉｉ？部分からの漏洩磁
場を大幅しこ減少させることができる、また１斤を開放
させるときは、中空部から磁性流体を流出させれば扉は
軽ｊ１１になるとともに非磁性体のみとなるので、磁力
で引っ張られることもなく容易に開閉させることができ
る。"Effects of the Invention" In the magnetically shielded room Kawa Jjt of the present invention, Jul is
1. It is possible to form a hollow part using a magnetic material and fill or flow the magnetic fluid into the hollow part. 11. If the hollow part is filled with the magnetic fluid, Ii? It is possible to significantly reduce the leakage magnetic field from the parts, and when opening the loaf, if the magnetic fluid flows out from the hollow part, the door becomes light and only non-magnetic material, so the magnetic force is reduced. It can be opened and closed easily without being pulled.
さらに磁性流体は流体であるため、流通路の形状はどの
ようなものでもよく、かつ保磁力が非常に小さいので磁
場をとり除くと鉄等の磁性体に吸収されることがなく取
り扱いは筒中である。また、室の扉部分をも磁気シール
ドできることにより、ＭＨＩ等から生じる磁場の距離減
衰をあまり考慮しなくてよいので、ＭＲＩ室の面積を小
さく抑えることができ、かつ室内の磁場の歪が小さくな
るのでシムコイルによる調整も容易である。Furthermore, since magnetic fluid is a fluid, the shape of the flow path can be any shape, and the coercive force is very small, so if the magnetic field is removed, it will not be absorbed by magnetic materials such as iron, and it can be handled inside the cylinder. . In addition, by magnetically shielding the door of the room, there is no need to take into account the distance attenuation of the magnetic field generated from MHI, etc., so the area of the MRI room can be kept small, and the distortion of the magnetic field inside the room is reduced. Therefore, adjustment using shim coils is easy.
第１図は未発明のｒ５気シールドルーム川［１の系統図
、第２図は磁気シールドルーム川１）？の断面図第３図
は従来のＭＲＩ室の磁場状態を示す説明図である。
ｌ；扉 ２；中空部 ３；流入口４；流
出１】５：磁性流体収容槽
６；ポンプ ８；電磁開閉弁
ＩＩ、＋２．伸縮管 ＋３．−、ｌｉ磁開閉弁出罪人
フジタ丁業 株式会社
代理人 Ｊ「埋土 牧 克 次
−手
糸売
ネ山
Ｅ
す￥（自発）Figure 1 is the system diagram of the uninvented R5 shield room river [1], Figure 2 is the magnetic shield room river 1)? FIG. 3 is an explanatory diagram showing the state of the magnetic field in a conventional MRI room. l; door 2; hollow part 3; inlet 4; outflow 1] 5: magnetic fluid storage tank 6; pump 8; electromagnetic on-off valve II, +2. Telescopic tube +3. -, Li magnetic on-off valve offender
Fujita Chogyo Co., Ltd. Agent J “Buried soil Katsutsugu Maki - Teitouri Neyama E Suyen (voluntary)
Claims (2)
、扉を非磁性材により中空状に形成し、扉の中空部に流
入口と流出口とを設けて、その流入口と磁性流体収容槽
とを途中にポンプを有する管路で連通し、中空部の流出
口と磁性流体収容槽とを管路で連通するとともにその管
路における流出口近くに開閉弁を設け、磁性流体を適宜
扉の中空部に充填できることを特徴とする磁気シールド
ルーム用扉。(1) In the door of a room where a device that generates a strong magnetic field is installed, the door is formed hollow from a non-magnetic material, an inlet and an outlet are provided in the hollow part of the door, and the inlet and the magnetic fluid are A conduit with a pump in the middle communicates with the storage tank, and a conduit communicates the outlet of the hollow part with the magnetic fluid storage tank, and an on-off valve is provided near the outlet of the conduit to supply the magnetic fluid as appropriate. A door for a magnetically shielded room that is characterized by the ability to fill the hollow part of the door.
もに、中空部の流入口とポンプとを連通する管路途中に
電磁開閉弁を設けて、２つの電磁開閉弁とポンプとを電
気的制御装置で制御するようにした請求項（１）の磁気
シールドルーム用扉。(2) Configure the on-off valve near the outlet with an electromagnetic on-off valve, and install an electromagnetic on-off valve in the middle of the pipe connecting the inlet of the hollow part and the pump, and connect the two electromagnetic on-off valves and the pump with electricity. The magnetically shielded room door according to claim 1, wherein the door is controlled by a digital control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63288769A JPH0722577B2 (en) | 1988-11-17 | 1988-11-17 | Magnetic shield room door |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63288769A JPH0722577B2 (en) | 1988-11-17 | 1988-11-17 | Magnetic shield room door |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02136128A true JPH02136128A (en) | 1990-05-24 |
| JPH0722577B2 JPH0722577B2 (en) | 1995-03-15 |
Family
ID=17734475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63288769A Expired - Lifetime JPH0722577B2 (en) | 1988-11-17 | 1988-11-17 | Magnetic shield room door |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0722577B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111706235A (en) * | 2020-06-23 | 2020-09-25 | 曹丽娟 | High-rise ventilation window capable of switching temperature |
| CN112096257A (en) * | 2020-10-20 | 2020-12-18 | 方晶 | Auxiliary ventilation noise-proof window |
-
1988
- 1988-11-17 JP JP63288769A patent/JPH0722577B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111706235A (en) * | 2020-06-23 | 2020-09-25 | 曹丽娟 | High-rise ventilation window capable of switching temperature |
| CN111706235B (en) * | 2020-06-23 | 2022-06-28 | 道县鑫莹建材有限公司 | High-rise ventilation window capable of switching temperature |
| CN112096257A (en) * | 2020-10-20 | 2020-12-18 | 方晶 | Auxiliary ventilation noise-proof window |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0722577B2 (en) | 1995-03-15 |
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