JP3752467B2

JP3752467B2 - Vacuum valve device

Info

Publication number: JP3752467B2
Application number: JP2002124492A
Authority: JP
Inventors: 勇當銘
Original assignee: 株式会社勇鉄工所
Priority date: 2002-04-25
Filing date: 2002-04-25
Publication date: 2006-03-08
Anticipated expiration: 2022-04-25
Also published as: JP2003314747A

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば断熱容器の真空用空間部（密閉空間部）を真空ポンプによって真空引きするのに使用される真空引き用弁装置に関する。
【０００２】
【従来の技術及びその課題】
従来におけるこの種の真空引き用弁装置は、構造が複雑で製作コストが高くつく上に、故障が多かった。
【０００３】
本発明は、構造簡単にして製作容易で、安価に提供できると共に、耐久性に優れた真空引き用弁装置を提供することを目的とする。
【０００４】
【課題を解決するための手段】
請求項１に係る発明の真空引き用弁装置は、軸方向に貫通するエア通路１８を有し、真空引きされる箇所に取り付けられ弁本体１４と、真空引き時に弁本体１４に装着されて、前記エア通路１８の一端側を真空ポンプ側に接続させる接続金具１５と、弁本体１４のエア通路１８中に設けられた弁室１９に遊嵌される弁１６と、を備え、弁室１９には、弁本体１４のエア通路１８の一端側に臨む弁１６の一端面１６ａが当接する一端側弁座部２１と、前記エア通路１８の他端側に臨む弁１６の他端面１６ｂが当接する他端側弁座部２２とを設けると共に、弁１６の一端面１６ａが一端側弁座部２１に当接する時に弁１６の一端面１６ａと一端側弁座部２１との間に開弁用の隙間を形成する隙間形成手段を弁の一端面１６ａ又は一端側弁座部２１に設け、接続金具１５を弁本体１４に装着して真空引きを開始すると、前記エア通路１８の一端側からの吸引力によって、弁１６の一端面１６ａが一端側弁座部２１に当接すると共に弁１６の他端面１６ｂが他端側弁座部２２から離間して開弁し、真空引きを終えると、エア通路１８の他端側に生ずる負圧による吸引力により弁１６の他端面１６ｂが他端側弁座部２２に当接して閉弁するようになっている真空引き用弁装置において、真空引き終了後に接続金具１５に代えて弁本体１４に装着される閉じ蓋であって、弁本体１４のエア通路１８の一端側を閉塞すると共に、弁１６の他端面１６ｂを弁室１９の他端側弁座部２２に押し付けるための閉じ蓋１７を備えてなることを特徴とする。
【０００５】
請求項２は、請求項１に記載の真空引き用弁装置において、隙間形成手段は、弁１６の一端面１６ａ又は一端側弁座部２１に形成される凹条部２３又は凸条部からなることを特徴とする。
【０００７】
【発明の実施の形態】
本発明に係る真空引き用弁装置を断熱式の液体貯蔵容器に実施した実施形態について、以下に説明する。
【０００８】
図１は液体貯蔵容器の外観斜視図、図２は液体貯蔵容器の容器本体３を示す縦断面図、図３は容器本体３に蓋体９を装着した状態の部分縦断面図である。この液体貯蔵容器は、図２に示すように、夫々ステンレス板製の内容器１と外ケース２とからなる二重壁構造の容器本体３を有する。この容器本体３の内容器１と外ケース２との間に密閉空間部４が形成され、この密閉空間部４の内容器１と外ケース２との間には補強リブ５が介設され、そしてこの密閉空間部４は、真空ポンプにより真空引きされて、例えば−２ＭＰａ（−２０kg / cm²Ｇ）程度の真空状態に保持されている。
【０００９】
容器本体３の上部中央には大口開口部６が設けられ、また容器本体３の側部には液体注入口７が、下部には液体取出口８が夫々設けられ、そして大口開口部６の周辺所要部に密閉空間部４を真空引きするための真空引き用弁装置１０が設けられている。液体注入口７は、図示は省略するが、通常は閉栓により閉塞され、必要によって液体注入管が接続される。また図示は省略するが、液体取出口８には液体取出用のコックが取り付けられる。
【００１０】
容器本体３の大口開口部６を開閉する蓋体９は、容器本体３と同じステンレス板により形成された内蓋部１１と外ケース部１２の二重壁構造からなるもので、内蓋部１１と外ケース部１２との間に密閉空間部１３が形成され、この密閉空間部１３内には、容器本体３の密閉空間部４に介設されたものと同じ補強リブ５が介設され、そしてこの密閉空間部１３も容器本体３と同様に真空ポンプによって真空引きされ、−２ＭＰａ（−２０kg / cm²Ｇ）程度の真空状態とされる。蓋体９の外ケース部１２にも、容器本体３側と同様に密閉空間部１３を真空引きするための真空引き用弁装置１０が設けられている（図１参照）。また蓋体９には把手３４が取り付けてある。
【００１１】
次に、容器本体３及び蓋体９に夫々設けられた真空引き用弁装置１０について図４及び図５を参照して説明する。図４の（Ａ）は、弁本体に接続金具を装着して真空引きを行なっている時の状態を示す真空引き用弁装置１０の縦断面図、同図の（Ｂ）は（Ａ）のＸ−Ｘ線断面図である。図５は、真空引きを終えた後、接続金具１５に代えて閉じ蓋１７を装着した状態での真空引き用弁装置１０の縦断面図である。また、図６は弁本体１４のみを示す縦断面図である。
【００１２】
この真空引き用弁装置１０は、軸方向に貫通するエア通路１８を有し、真空引きされる箇所である容器本体３及び蓋体９に夫々取り付けられる弁本体１４と、真空引き時に弁本体１４に装着され、弁本体１４のエア通路１８の一端側を真空ポンプ（図示せず）側に接続させる接続金具１５と、弁本体１４のエア通路１８中に設けられた弁室１９に遊嵌される弁１６と、真空引き終了後に接続金具１５に代えて弁本体１４に装着される閉じ蓋１７と、を具備している。
【００１３】
弁本体１４の弁室１９には、弁本体１４のエア通路１８の一端側に臨む弁１６の一端面１６ａが当接する一端側弁座部２１と、前記エア通路１８の他端側に臨む弁１６の他端面１６ｂが当接する他端側弁座部２２とが形成されると共に、弁１６の一端面１６ａが弁室１９の一端側弁座部２１に当接する時に、その間に開弁用の隙間を形成する凹状部２３（隙間形成手段）が弁１６の一端面１６ａに十字状に形成されている。この十字状凹状部２３は図４の（Ｂ）に示される。
【００１４】
この弁本体１４は、図６にも示すように、取付用鍔部２４を突設した中空軸状の第１部材１４ａと、この第１部材１４ａの下端部に接合されて、この第１部材１４ａとの間に弁室１９を形成し、中央部に貫通孔１８ｂを有する有底円筒状の第２部材１４ｂと、からなるもので、中空軸状第１部材１４ａの中空部はねじ孔１８ａからなり、この中空軸状第１部材１４ａの下端面が弁室１９の一端側弁座部２１を形成し、有底円筒状第２部材１４ｂの底面が他端側弁座部２２を形成する。また、中空軸状第１部材１４ａのねじ孔１８ａが、弁本体１４を軸方向に貫通するエア通路１８の一端側通路部となり、有底円筒状第２部材１４ｂの中央貫通孔１８ｂがエア通路１８の他端側通路部となり、しかしてエア通路１８の一端側通路部である第１部材１４ａのねじ孔１８ａと、他端側通路部である第２部材１４ｂの中央貫通孔１８ｂとの間に弁室１９が形成されることになる。
【００１５】
また、有底円筒状第２部材１４ｂの底面である他端側弁座部２２には環状溝２５が形成され、この溝２５には気密シール用のＯリング２６が嵌装されており、また中空軸状第１部材１４ａの上端部に突設された取付用鍔部２４の上端面にも環状溝２７が形成されて、この溝２７に気密シール用Ｏリング２８が嵌装されている。尚、第１部材１４ａと第２部材１４ｂとは、それらの間に形成される弁室１９に弁１６を遊嵌した後、溶接によって互いに気密状態に接合され、その溶接接合部を図４の（Ａ）及び図５に２９で示す。
【００１６】
接続金具１５は、金具本体部１５ａの下端中央部に、前記弁本体１４の第１部材１４ａのねじ孔１８ａに螺合するねじ軸部１５ｂを突設してなるもので、金具本体部１５ａ側にはその中心部に径大通路３０が形成され、ねじ軸部１５ｂ側には径小通路３１が径大通路３０と連通して形成されている。図４に示すように、この接続金具１５の金具本体１５ａには、真空ポンプ（図示省略）に接続配管されるエア吸引管３２が連通連結される。
【００１７】
閉じ蓋１７は、図５に示すように、蓋本体部１７ａの下端中央部に、前記弁本体１４の第１部材１４ａのねじ孔１８ａに螺合するねじ軸部１７ｂを突設してなるもので、真空引き終了後に接続金具１５に代えて弁本体１４に装着することにより、弁本体１４を貫通するエア通路１８の一端側通路部１８ａを閉塞すると共に、例えばウレタンゴムで形成された弾性押え部材２０を介して弁１６の他端面１６ｂを弁室１９の他端側弁座部２２に押し付け、弁１６の閉弁状態を確実に保持するようになっている。蓋本体部１７ａの上面には、閉じ蓋１７を弁本体１４に装着する時に使用する回転操作具を係止するための孔３３が複数個設けられている。
【００１８】
上記のような構成よりなる真空引き用弁装置１０の使用方法について説明すると、この真空引き用弁装置１０の使用に先立って、弁本体１４を、真空引きされる箇所である容器本体３及び蓋体９の夫々所要部に取り付ける。この弁本体１４の取付けにあたっては、容器本体３の外ケース２あるいは蓋体９の外ケース部１２に所要径の孔を開けて、図４の（Ａ）及び図５に示すように、弁本体１４の第１部材１４ａ側を密閉空間部４，１３に突入させ、第２部材１４ｂの取付用鍔部２４を外ケース２あるいは外ケース部１２の外面に当接させた状態で溶接により固着する。
【００１９】
こうして弁本体１４を容器本体３及び蓋体９の夫々所要部に固着したならば、図４に示すように、接続金具１５のねじ軸部１５ｂを弁本体１４のねじ孔１４ａに螺合して締め付け、接続金具１５を弁本体１４に気密状態に装着することにより、弁本体１４のエア通路１８の一端側通路部１８ａを真空ポンプ側に接続し、真空引き可能な状態とする。
【００２０】
斯かる状態で真空ポンプを作動して容器本体３又は蓋体９における密閉空間部４又は１３の真空引きを開始すると、真空ポンプ側からエア吸引管３２を通じて真空引き用弁装置１０内のエアが吸引され、しかして弁本体１４内においては、図４の（Ａ）から分かるように、エア通路１８の一端側通路部１８ａより吸引されるエアの吸引力により、弁１６の一端面１６ａが弁室１９の一端側弁座部２１に当接されると共に、弁１６の他端面１６ｂが他端側弁座部２２から離間して、開弁状態となる。
【００２１】
この時、弁１６の一端面１６ａが弁室１９の一端側弁座部２１に当接しても、弁１６の一端面１６ａには開弁用の隙間形成手段である十字状の凹状部２３が形成されているため、密閉空間部４又は１３内のエアは、エア通路１８の他端側通路部１８ｂから、弁室１９の内周面と弁１６の外周面との間に形成された隙間を通過してエア通路１８の一端側通路部１８ａに入り、接続金具１５内部の通路３１，３０を通って吸引管３２に吸引され、これによって密閉空間部４又は１３の真空引きが行なわれる。
【００２２】
容器本体３側の密閉空間部４又は蓋体９側の密閉空間部１３を所定圧力まで真空引きし終えた後、真空ポンプの作動を停止すると、エア通路１８の一端側通路部１８ａにはそれまで弁１６を弁室１９の一端側弁座部２１に当接させていたエア吸引力がなくなって、弁１６を挟んでエア通路１８の他端側通路部１８ｂに密閉空間部４又は１３に負圧が生じるから、その負圧によるエア通路１８の他端側通路部１８ｂからの吸引力により、弁１６の他端面１６ｂが吸引されてＯリング２６を介し弁室１９の他端側弁座部２２に当接し、閉弁状態となる。
【００２３】
上記のように弁本体１４内の弁１６が閉弁した後、接続金具１５を弁本体１４から取り外して、図５に示すように閉じ蓋１７を取り付ける。即ち、接続金具１５を取り外した弁本体１４のねじ孔１８ａに弾性押え部材２０を挿入して、このねじ孔１８ａに閉じ蓋１７のねじ軸部１７ｂをねじ込み、蓋本体部１７ａの下端面をＯリング２８を介して弁本体１４の上端面に当接させることにより、弁本体１４のエア通路１８の一端側通路部１８ａを閉塞すると共に、ねじ軸部１７ｂの先端面（下端面）で弾性押え部材２０を押圧して、この押え部材２０を介して弁１６の他端面１６ｂを弁室１９の他端側弁座部２２に押し付ける。
【００２４】
尚、閉じ蓋１７を弁本体１４に装着しなくても、エア通路１８の他端側通路部１８ｂからのエア吸引力によって弁１６を他端側弁座部２２に当接した閉弁状態に保持させることができるが、容器本体３や蓋体９に振動や衝撃がかかった場合弁１６が弁座部２２から離間して閉弁状態が解除されるおそれがあることから、閉じ蓋１７を弁本体１４に装着することによって、弁１６を閉弁状態に確実に保持することができる。
【００２５】
また、この実施形態では、弁１６の一端面１６ａが弁室１９の一端側弁座部２１に当接する時にその間に開弁用の隙間を形成するための隙間形成手段として、弁１６の一端面１６ａに十字状の凹状部２３を形成したが、この十字状凹状部２３の代わりに、例えば十字状の凸状部（図示せず）を弁１６の一端面１６ａに形成してもよい。また、弁１６の一端面１６ａにはそのような凹状部や凸状部を形成せず、弁室１９の一端側弁座部２１に凹状部や凸状部を形成してもよい。
【００２６】
【発明の効果】
請求項１に係る発明の真空引き用弁装置によれば、軸方向に貫通するエア通路を有し、真空引きされる箇所に取り付けられ弁本体と、真空引き時に弁本体に装着され、前記エア通路の一端側を真空ポンプ側に接続させる接続金具と、弁本体の弁室に遊嵌される弁とからなるもので、真空引きを開始する時は、弁本体のエア通路の一端側からの吸引力によって弁の一端面が一端側弁座部に当接すると共に弁の他端面が他端側弁座部から離間して開弁し、真空引きを終えると、エア通路の他端側に生ずる負圧による吸引力により弁の他端面が他端側弁座部に当接して閉弁するようにしたから、真空引きする箇所に弁本体を取り付け、この弁本体に接続金具を装着するだけで、真空引き作業を簡単に行なうことができ、しかもこの真空引き用弁装置は構造が簡単で部品点数が少ないから、安価に製作でき、耐久性に優れ、使用寿命が長い。
また本発明によれば、真空引き終了後に接続金具に代えて閉じ蓋を弁本体に装着することによって、弁本体に振動や衝撃が作用しても、弁が弁座部から離間して開弁状態になるおそれがなく、弁を閉弁状態に確実に保持できる。
【００２７】
請求項２に係る発明によれば、隙間形成手段は、弁の一端面又は一端側弁座部に形成される凹条部又は凸条部からなるもため、その製作が容易となる。
【図面の簡単な説明】
【図１】本発明に係る真空引き用弁装置を備えた液体貯蔵容器の外観斜視
図である。
【図２】図１に示す液体貯蔵容器の容器本体の縦断面図である。
【図３】容器本体に蓋体を装着した状態の部分縦断面図である。
【図４】（Ａ）は弁本体に接続金具を装着して真空引きを行なっている時の状態を示す本発明の真空引き用弁装置の縦断面図、（Ｂ）は（Ａ）のＸ−Ｘ
線断面図である。
【図５】真空引きを終えた後、接続金具に代えて閉じ蓋を装着した状態で
の真空引き用弁装置の縦断面図である。
【図６】弁本体のみを示す縦断面図である。
【符号の説明】
１内容器
２外ケース
３容器本体
４密閉空間部
１０真空引き用弁装置
１２蓋体
１３内蓋部
１４外ケース部
１５密閉空間部
１６弁
１７閉じ蓋
１８弁本体のエア通路
１９弁室
２０弾性押え部材
２１弁室の一端側弁座部
２２弁室の他端側弁座部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a evacuation valve device used for evacuating a vacuum space (sealed space) of a heat insulating container, for example, with a vacuum pump.
[0002]
[Prior art and problems]
This type of evacuation valve device of the prior art has a complicated structure and high manufacturing cost, and has many failures.
[0003]
SUMMARY OF THE INVENTION An object of the present invention is to provide a vacuum evacuation valve device that has a simple structure, is easy to manufacture, can be provided at low cost, and has excellent durability.
[0004]
[Means for Solving the Problems]
The evacuation valve device of the invention according to claim 1 has an air passage 18 penetrating in the axial direction, and is attached to a valve body 14 attached to a portion to be evacuated, and attached to the valve body 14 at the time of evacuation, A connecting fitting 15 for connecting one end of the air passage 18 to the vacuum pump side; and a valve 16 loosely fitted in a valve chamber 19 provided in the air passage 18 of the valve body 14. The one end side valve seat portion 21 that contacts one end surface 16a of the valve 16 facing one end side of the air passage 18 of the valve body 14 and the other end surface 16b of the valve 16 facing the other end side of the air passage 18 abut. The other end side valve seat portion 22 is provided, and when the one end surface 16a of the valve 16 contacts the one end side valve seat portion 21, the valve 16 is used for opening the valve between the one end surface 16a and the one end side valve seat portion 21 . One end surface 16a of the valve or one end side valve seat portion 21 is used as the gap forming means for forming the gap. When the connection fitting 15 is mounted on the valve body 14 and evacuation is started, the one end surface 16a of the valve 16 comes into contact with the one end side valve seat portion 21 by the suction force from one end side of the air passage 18, and the valve When the other end surface 16b of the valve 16 is opened away from the other end side valve seat portion 22 and the evacuation is finished, the other end surface 16b of the valve 16 is moved to the other by the suction force due to the negative pressure generated on the other end side of the air passage 18. In the evacuating valve device configured to contact and close the end-side valve seat portion 22, a closing lid that is attached to the valve main body 14 instead of the connection fitting 15 after the evacuation is completed, 14 is provided with a closing lid 17 for closing one end side of the air passage 18 and pressing the other end face 16b of the valve 16 against the valve seat portion 22 on the other end side of the valve chamber 19 .
[0005]
According to a second aspect of the present invention, in the evacuating valve device according to the first aspect, the gap forming means includes a concave strip portion 23 or a convex strip portion formed on the one end face 16a of the valve 16 or the one end side valve seat portion 21. It is characterized by that.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment in which the evacuation valve device according to the present invention is implemented in an adiabatic liquid storage container will be described below.
[0008]
1 is an external perspective view of a liquid storage container, FIG. 2 is a longitudinal sectional view showing a container body 3 of the liquid storage container, and FIG. 3 is a partial longitudinal sectional view of a state in which a lid 9 is attached to the container body 3. As shown in FIG. 2, the liquid storage container has a double-walled container body 3 composed of an inner container 1 and an outer case 2 each made of a stainless steel plate. A sealed space portion 4 is formed between the inner container 1 and the outer case 2 of the container body 3, and a reinforcing rib 5 is interposed between the inner container 1 and the outer case 2 of the sealed space portion 4, The sealed space 4 is evacuated by a vacuum pump and is maintained in a vacuum state of about −2 MPa (−20 kg / cm ² G), for example.
[0009]
A large opening 6 is provided at the upper center of the container body 3, a liquid inlet 7 is provided at the side of the container body 3, and a liquid outlet 8 is provided at the bottom, and the periphery of the large opening 6. A evacuation valve device 10 for evacuating the sealed space 4 is provided at a required portion. Although not shown in the drawings, the liquid inlet 7 is normally closed by plugging, and a liquid injection pipe is connected if necessary. Although not shown, a liquid take-out cock is attached to the liquid take-out port 8.
[0010]
The lid body 9 that opens and closes the large opening 6 of the container body 3 has a double wall structure of an inner lid portion 11 and an outer case portion 12 formed of the same stainless steel plate as the container body 3. A sealed space portion 13 is formed between the outer casing portion 12 and the outer case portion 12, and the same reinforcing rib 5 as that interposed in the sealed space portion 4 of the container body 3 is interposed in the sealed space portion 13. The sealed space 13 is also evacuated by a vacuum pump in the same manner as the container body 3 to be in a vacuum state of about −2 MPa (−20 kg / cm ² G). The outer case portion 12 of the lid body 9 is also provided with a evacuation valve device 10 for evacuating the sealed space portion 13 as in the case of the container body 3 (see FIG. 1). A handle 34 is attached to the lid 9.
[0011]
Next, the evacuation valve device 10 provided in the container body 3 and the lid body 9 will be described with reference to FIGS. 4 and 5. 4A is a longitudinal cross-sectional view of the evacuating valve device 10 showing a state in which the connection fitting is attached to the valve body and evacuation is performed, and FIG. 4B is a view of FIG. It is XX sectional drawing. FIG. 5 is a vertical cross-sectional view of the evacuating valve device 10 in a state in which a closing lid 17 is mounted instead of the connection fitting 15 after evacuation. FIG. 6 is a longitudinal sectional view showing only the valve body 14.
[0012]
This evacuation valve device 10 has an air passage 18 penetrating in the axial direction, and has a valve main body 14 attached to the container main body 3 and the lid 9 that are evacuated, and a valve main body 14 during evacuation. Is attached to a valve fitting 19 for connecting one end of the air passage 18 of the valve body 14 to a vacuum pump (not shown) and a valve chamber 19 provided in the air passage 18 of the valve body 14. And a closing lid 17 attached to the valve body 14 in place of the connection fitting 15 after evacuation.
[0013]
In the valve chamber 19 of the valve body 14, one end side valve seat portion 21 that abuts one end surface 16 a of the valve 16 facing one end side of the air passage 18 of the valve body 14, and a valve facing the other end side of the air passage 18. 16 and the other end side valve seat portion 22 with which the other end surface 16b abuts, and when the one end surface 16a of the valve 16 abuts against the one end side valve seat portion 21 of the valve chamber 19, A concave portion 23 (gap forming means) that forms a gap is formed in a cross shape on one end surface 16 a of the valve 16. This cross-shaped concave portion 23 is shown in FIG.
[0014]
As shown in FIG. 6, the valve body 14 is joined to a hollow shaft-shaped first member 14 a projecting from a mounting flange 24 and a lower end portion of the first member 14 a, and the first member 14a is formed with a bottomed cylindrical second member 14b having a through hole 18b at the center, and the hollow portion of the hollow shaft-shaped first member 14a is a screw hole 18a. The bottom end surface of the hollow shaft-shaped first member 14a forms one end side valve seat portion 21 of the valve chamber 19, and the bottom surface of the bottomed cylindrical second member 14b forms the other end side valve seat portion 22. . Further, the screw hole 18a of the hollow shaft-shaped first member 14a serves as one end side passage portion of the air passage 18 that penetrates the valve body 14 in the axial direction, and the central through hole 18b of the bottomed cylindrical second member 14b serves as the air passage. 18 between the screw hole 18a of the first member 14a which is the one end side passage portion of the air passage 18 and the central through hole 18b of the second member 14b which is the other end side passage portion. Thus, the valve chamber 19 is formed.
[0015]
Further, an annular groove 25 is formed in the other end side valve seat portion 22 which is the bottom surface of the bottomed cylindrical second member 14b, and an O-ring 26 for hermetic sealing is fitted in the groove 25, and An annular groove 27 is also formed on the upper end surface of the mounting flange 24 projecting from the upper end of the hollow shaft-shaped first member 14 a, and an airtight seal O-ring 28 is fitted into the groove 27. The first member 14a and the second member 14b are joined to each other in an airtight state by welding after the valve 16 is loosely fitted in the valve chamber 19 formed between them. This is indicated by 29 in FIG.
[0016]
The connection fitting 15 is formed by projecting a screw shaft portion 15b that is screwed into the screw hole 18a of the first member 14a of the valve body 14 at the center of the lower end of the fitting body portion 15a. A large-diameter passage 30 is formed at the center thereof, and a small-diameter passage 31 is formed in communication with the large-diameter passage 30 on the screw shaft portion 15b side. As shown in FIG. 4, an air suction pipe 32 connected to a vacuum pump (not shown) is connected to the metal fitting body 15a of the connection metal piece 15 in communication.
[0017]
As shown in FIG. 5, the closing lid 17 is formed by projecting a screw shaft portion 17b that is screwed into the screw hole 18a of the first member 14a of the valve body 14 at the center of the lower end of the lid body portion 17a. Then, after the evacuation is completed, the one end side passage portion 18a of the air passage 18 penetrating the valve main body 14 is closed by being attached to the valve main body 14 instead of the connection fitting 15, and an elastic presser formed of, for example, urethane rubber The other end surface 16 b of the valve 16 is pressed against the other end side valve seat portion 22 of the valve chamber 19 via the member 20, so that the valve 16 is securely held in the closed state. A plurality of holes 33 are provided on the upper surface of the lid body portion 17a for locking a rotary operation tool used when the closing lid 17 is mounted on the valve body 14.
[0018]
The use method of the evacuating valve device 10 having the above-described configuration will be described. Prior to the use of the evacuating valve device 10, the valve main body 14 is evacuated to the container main body 3 and the lid. Attach to each required part of body 9. When the valve body 14 is attached, a hole having a required diameter is formed in the outer case 2 of the container body 3 or the outer case portion 12 of the lid body 9, and as shown in FIGS. The first member 14a side of 14 is inserted into the sealed spaces 4 and 13, and the fixing member 24 of the second member 14b is fixed to the outer case 2 or the outer surface of the outer case 12 in a state of being in contact with the outer case 2 by welding. .
[0019]
When the valve body 14 is fixed to the required portions of the container body 3 and the lid body 9 in this way, the screw shaft portion 15b of the connection fitting 15 is screwed into the screw hole 14a of the valve body 14 as shown in FIG. By tightening and attaching the connection fitting 15 to the valve main body 14 in an airtight state, the one end side passage portion 18a of the air passage 18 of the valve main body 14 is connected to the vacuum pump side so that a vacuum can be drawn.
[0020]
When the vacuum pump is operated in such a state to start evacuation of the sealed space 4 or 13 in the container body 3 or the lid body 9, the air in the evacuation valve device 10 flows from the vacuum pump side through the air suction pipe 32. As shown in FIG. 4A, the one end surface 16 a of the valve 16 is pulled into the valve body 14 by the suction force of the air sucked from the one end side passage portion 18 a of the air passage 18. While being in contact with the one end side valve seat portion 21 of the chamber 19, the other end face 16 b of the valve 16 is separated from the other end side valve seat portion 22, and the valve is opened.
[0021]
At this time, even if the one end surface 16a of the valve 16 contacts the one end side valve seat portion 21 of the valve chamber 19, a cross-shaped concave portion 23 serving as a gap forming means for opening the valve is formed on the one end surface 16a of the valve 16. Since the air in the sealed space 4 or 13 is formed, a gap formed between the inner peripheral surface of the valve chamber 19 and the outer peripheral surface of the valve 16 from the other end side passage portion 18b of the air passage 18. The air passage 18 enters the one end side passage portion 18a of the air passage 18 and is sucked into the suction pipe 32 through the passages 31 and 30 inside the connection fitting 15, whereby the sealed space portion 4 or 13 is evacuated.
[0022]
When the operation of the vacuum pump is stopped after the sealed space portion 4 on the container body 3 side or the sealed space portion 13 on the lid body 9 side has been evacuated to a predetermined pressure, the one end side passage portion 18a of the air passage 18 has its The air suction force that caused the valve 16 to contact the one end side valve seat portion 21 of the valve chamber 19 disappears until the valve 16 is sandwiched between the other end side passage portion 18b of the air passage 18 and the sealed space portion 4 or 13. Since negative pressure is generated, the other end surface 16b of the valve 16 is sucked by the suction force from the other end side passage portion 18b of the air passage 18 due to the negative pressure, and the other end side valve seat of the valve chamber 19 through the O-ring 26. It abuts on the portion 22 and enters a valve-closed state.
[0023]
After the valve 16 in the valve body 14 is closed as described above, the connection fitting 15 is removed from the valve body 14 and a closing lid 17 is attached as shown in FIG. That is, the elastic pressing member 20 is inserted into the screw hole 18a of the valve main body 14 from which the connection fitting 15 has been removed, and the screw shaft portion 17b of the closing lid 17 is screwed into the screw hole 18a. By contacting the upper end surface of the valve main body 14 via the ring 28, the one end side passage portion 18a of the air passage 18 of the valve main body 14 is closed, and the elastic retainer is held by the front end surface (lower end surface) of the screw shaft portion 17b. The member 20 is pressed, and the other end surface 16 b of the valve 16 is pressed against the other end side valve seat portion 22 of the valve chamber 19 through the pressing member 20.
[0024]
Even if the closing lid 17 is not attached to the valve body 14, the valve 16 is brought into contact with the other end side valve seat portion 22 by the air suction force from the other end side passage portion 18 b of the air passage 18. However, when the container body 3 or the lid body 9 is subjected to vibration or impact, the valve 16 may be separated from the valve seat portion 22 and the closed state may be released. By mounting on the valve body 14, the valve 16 can be reliably held in the closed state.
[0025]
Further, in this embodiment, when the one end surface 16a of the valve 16 contacts the one end side valve seat portion 21 of the valve chamber 19, one end surface of the valve 16 is formed as a gap forming means for forming a valve opening gap therebetween. Although the cross-shaped concave portion 23 is formed on 16a, instead of the cross-shaped concave portion 23, for example, a cross-shaped convex portion (not shown) may be formed on the one end surface 16a of the valve 16. Further, such a concave portion or convex portion may not be formed on the one end surface 16 a of the valve 16, and a concave portion or convex portion may be formed on the one end side valve seat portion 21 of the valve chamber 19.
[0026]
【The invention's effect】
According to the evacuation valve device of the invention of claim 1, the air passage that penetrates in the axial direction is attached to the valve body that is evacuated and attached to the valve body during evacuation, and the air It consists of a fitting that connects one end of the passage to the vacuum pump side, and a valve that is loosely fitted in the valve chamber of the valve body. One end surface of the valve is brought into contact with the one end side valve seat portion by the suction force, and the other end surface of the valve is opened away from the other end side valve seat portion. Because the other end surface of the valve is in contact with the valve seat on the other end side due to the suction force caused by the negative pressure, the valve body is closed. Evacuation work can be performed easily, and this evacuation valve device Because there is a small number of parts and simple structure, inexpensive to manufacture, durable, long service life.
Further, according to the present invention, after the evacuation is completed, the valve is separated from the valve seat portion even when vibration or impact is applied to the valve body by attaching a closing lid to the valve body instead of the connection fitting. There is no fear of a state, and the valve can be reliably held in the closed state.
[0027]
According to the invention which concerns on Claim 2, since a clearance gap formation means consists of a concave part or convex part formed in the one end surface or one end side valve seat part of a valve, the manufacture becomes easy.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a liquid storage container equipped with a evacuation valve device according to the present invention.
FIG. 2 is a longitudinal sectional view of a container main body of the liquid storage container shown in FIG.
FIG. 3 is a partial vertical cross-sectional view showing a state where a lid is attached to a container body.
FIG. 4A is a longitudinal sectional view of the evacuating valve device of the present invention showing a state in which a connection fitting is attached to the valve body and evacuation is performed, and FIG. 4B is an X of FIG. -X
It is line sectional drawing.
FIG. 5 is a longitudinal sectional view of the evacuating valve device in a state where a closing lid is attached instead of the connection fitting after the evacuation is completed.
FIG. 6 is a longitudinal sectional view showing only the valve body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inner container 2 Outer case 3 Container main body 4 Sealed space part 10 Vacuuming valve device 12 Lid body 13 Inner cover part 14 Outer case part 15 Sealed space part 16 Valve 17 Closing cover 18 Air passage 19 of valve body 19 Valve chamber 20 Elasticity Presser member 21 Valve seat portion on one end side of valve chamber 22 Valve seat portion on the other end side of valve chamber

Claims

An air passage penetrating in the axial direction, a valve body attached to a portion to be evacuated, a fitting that is attached to the valve body during evacuation and connects one end side of the air passage to the vacuum pump side; A valve loosely fitted in a valve chamber provided in the air passage of the valve body,
The valve chamber has one end side valve seat portion that contacts one end surface of the valve facing the one end side of the air passage of the valve body, and the other end side valve seat that contacts the other end surface of the valve facing the other end side of the air passage. And a gap forming means for forming a gap for opening the valve between the one end surface of the valve and the one end side valve seat portion when the one end surface of the valve contacts the one end side valve seat portion. Or provided at one end side valve seat,
When evacuation is started with the fitting attached to the valve body, the one end surface of the valve abuts on the one end side valve seat portion and the other end surface of the valve is the other end side valve by the suction force from one end side of the air passage. When the valve is opened apart from the seat, and the evacuation is completed, the other end surface of the valve abuts on the valve seat on the other end side and closes by the suction force caused by the negative pressure generated on the other end side of the air passage. In the evacuation valve device ,
A closing lid that is attached to the valve body in place of the connection fitting after evacuation, closes one end of the air passage in the valve body, and presses the other end of the valve against the valve seat on the other end of the valve chamber A evacuating valve device comprising a closing lid for the evacuation.

2. The evacuation valve device according to claim 1, wherein the gap forming means includes a concave strip or a convex strip formed on one end surface or one valve seat portion of the valve.