JPS5814952B2 - Valve seal structure - Google Patents

Description

【発明の詳細な説明】 本発明は、弁箱側の弁座に対し下流側から上流側に向か
う方向で当接することにより閉弁作用を発揮する弾性板
状の弁体シートを備えている弁のシール構造に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a valve equipped with an elastic plate-shaped valve body seat that exerts a valve-closing action by coming into contact with a valve seat on the valve body side in a direction from the downstream side to the upstream side. Regarding the seal structure.

この種の弁においては、閉弁時に弁体シートに作用する
流体圧が、弁体シートな弁箱側弁座から離すように働く
。In this type of valve, fluid pressure acting on the valve body seat when the valve is closed acts to separate the valve body from the valve body side valve seat.

それにも拘わらず弁体シートを流体圧に抗して弁箱側弁
座に対し強力に圧接して閉弁を確実化する必要がある。Nevertheless, it is necessary to forcefully press the valve body seat against the valve seat on the valve box side against fluid pressure to ensure valve closing.

従来、実公昭３６−１１６５５号公報が開示されている
。Conventionally, Japanese Utility Model Publication No. 36-11655 has been disclosed.

公知のものは、第５図にも示すように弁体シート２０が
、円筒部とそれより大径の球状部とを組合せたような形
、つまり、断面中空かまぼこ形状の環状体に構成されて
いる。In the known valve body seat 20, as shown in FIG. 5, the valve body seat 20 is formed into a shape that combines a cylindrical portion and a spherical portion with a larger diameter, that is, an annular body having a hollow semicylindrical cross section. There is.

この中空環状の弁体シート２０は、閉弁時に、その外側
部分２１（前述の球状部に相当）が流体圧を受け、内側
部分２２（前述の円筒部に相当）に接近する方向に移動
する。When the hollow annular valve body seat 20 is closed, its outer portion 21 (corresponding to the aforementioned spherical portion) receives fluid pressure and moves in a direction approaching the inner portion 22 (corresponding to the aforementioned cylindrical portion). .

このとき外側部分２１は、それの球状面に沿って外方に
向う圧縮力を生じ前記外側部分の端部が弁箱側弁座２３
の流路円筒内面に押圧される。At this time, the outer part 21 generates a compressive force directed outward along its spherical surface, and the end of the outer part 21 is pressed against the valve body side valve seat 21.
The flow channel is pressed against the inner surface of the cylinder.

これによって、弁体シート２０の周辺部が弁箱側弁座２
３に当接してシート性を保つものである。As a result, the peripheral portion of the valve body seat 20 is aligned with the valve body side valve seat 2.
3 to maintain sheet properties.

しかし、この構成では、球面に作用する流体圧により弾
性体の球面の周辺部を外方に拡げようとする力を弁座２
３へ当接する押圧力に利用するものであるが、弾性体は
周辺部の周長さ全長な引沖す力にエネルギーを消費され
半径方向の沖び量が少いので、相当大きな流体圧でなけ
れば効果がなく小さな流体圧では押圧力が小さくシール
性の向上性が少ない欠点がある。However, with this configuration, the force that tries to expand the periphery of the spherical surface of the elastic body outward due to the fluid pressure acting on the spherical surface is absorbed by the valve seat 2.
3, but the elastic body consumes energy due to the pulling force of the entire peripheral length of the peripheral part, and the amount of floating in the radial direction is small, so it can be used with a considerably large fluid pressure. Otherwise, it is ineffective, and with a small fluid pressure, the pressing force is small and there is a drawback that the improvement in sealing performance is small.

又、弁体シート２０の外側部分２１０周辺部が内側部分
２２の周辺部に一体的に連設されているために、閉弁時
に流体圧によって外側部分２１を押し拡げる作用が抑制
されるような状態となり、前記周辺部と前記弁座２３の
流路内面と平行な面との当接が離れる傾向となりシール
性の向上性が阻害される欠点がある 本発明が解決しようとする技術的課題は、閉弁時、流体
圧およびその反作用の力をテコ作用に＋用し、前記弁体
シートの外周縁部の弁箱側弁座に対する圧接作用を高め
る点にある 上記技術的課題を解決するために本発明が講じる技術的
手段は次のとおりである。In addition, since the periphery of the outer portion 210 of the valve body seat 20 is integrally connected to the periphery of the inner portion 22, the action of pushing and expanding the outer portion 21 due to fluid pressure when the valve is closed is suppressed. The technical problem to be solved by the present invention is that the peripheral portion tends to come out of contact with the surface parallel to the inner surface of the flow path of the valve seat 23, and the improvement in sealing performance is hindered. To solve the above-mentioned technical problem in that when the valve is closed, the fluid pressure and its reaction force are used as leverage to enhance the pressing action of the outer peripheral edge of the valve body seat against the valve seat on the valve body side. The technical measures taken by the present invention are as follows.

前記弾性板状の弁体シートの下流側の面に対し弁体シー
トが弁箱側弁座に当接する部位よりも中心側寄りでかつ
前記当接部位の近傍に相当する箇所において当接する環
状の弁体シート支えが弁体に取付けられているとともに
、この環状の弁体シート支えの弁体シートに対する当接
部位より中心側において弁体シートが閉弁時に流体から
受ける力によって、この弁体シートの外周辺部が前記弁
体シート支えを支点として前記弁箱側シートに近づく方
向に曲げ力を受けるように、前記弁体シート支えの弁体
シートに対する当接部位および弁体シートの性状が定め
られている、という構成である。an annular ring that contacts the downstream surface of the elastic plate-shaped valve seat at a location closer to the center than the part where the valve seat contacts the valve box side valve seat and corresponds to the vicinity of the contact part; The valve body seat support is attached to the valve body, and the valve body seat is moved by the force that the valve body seat receives from the fluid when the valve is closed, at the center side of the contact area of the annular valve body seat support with the valve body seat. A contact portion of the valve body seat support with respect to the valve body seat and properties of the valve body seat are determined so that an outer peripheral portion of the valve body seat support receives a bending force in a direction approaching the valve body side seat using the valve body seat support as a fulcrum. The structure is such that it is

本発明の上記構成の作用は次のとおりである。The effects of the above configuration of the present invention are as follows.

弁体を閉弁姿勢に切換えると、弁体シートの上流側に流
体圧が掛る。When the valve body is switched to the closed position, fluid pressure is applied to the upstream side of the valve body seat.

この流体圧により、弁体シートの中心側が下流側に向け
て変位し、これにより、弁体シート支えの当接部をてこ
の支点として弁体シートの前記外側の周辺部が上流側に
変位し、すなわち、前記外側の周辺部がその面に垂直な
上流側に変位し弁箱側弁座に押圧される。Due to this fluid pressure, the center side of the valve body seat is displaced toward the downstream side, and thereby, the outer peripheral portion of the valve body seat is displaced toward the upstream side using the abutting portion of the valve body seat support as a fulcrum. That is, the outer peripheral portion is displaced to the upstream side perpendicular to the surface thereof and is pressed against the valve seat on the valve box side.

弁箱側弁座に対する圧接作用が高められそれによってシ
ール性が向上される１本発明の特有の効果は、球面に作
用する流体圧が球面周辺部を押し拡げる形式のように大
きな流体圧を必要とするものではなく、弁体シートの板
面の曲げを利用するから、小さな流体圧で十分な圧接作
用を発揮し、シール性を高めることができる。The unique effect of the present invention is that the pressure contact action against the valve seat on the valve box side is increased, thereby improving the sealing performance.1 The unique effect of the present invention is that the fluid pressure acting on the spherical surface pushes and expands the periphery of the spherical surface, which requires large fluid pressure. Since the bending of the plate surface of the valve body seat is used instead of the bending of the plate surface of the valve body seat, sufficient pressure contact action can be exerted with small fluid pressure, and sealing performance can be improved.

又、上記のようなてこ作用を働かせるために必要とされ
る弁体シートの形状は、比較的単純なものであり、従来
例の断面中空かまぼこ形状の環状体より遥かに簡単なも
のですむ。Further, the shape of the valve seat required to exert the above-mentioned lever action is relatively simple, and is much simpler than the annular body having a hollow semicircular cross section in the conventional example.

又、てこの支点として設ける環状の弁体シート支えも比
較的簡単な形状、構造のものでよい。Further, the annular valve seat support provided as a fulcrum of the lever may also be of relatively simple shape and structure.

次に、本発明の一実施例を第１図、第２図に基いて詳述
する。Next, one embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

各種流体輸送管１，１に対する接続用フランジ２．２を
備える弁箱部分３ａ、３ａと弁箱本体３ｂとを、０−リ
ング４，４を介して分離自在にボルト連結すると共に、
弁箱部分３ａ、３ａの内部に、弁箱本体３ｂの内径より
も小径に球面加工を施し、球面状の弁箱側弁座５，５を
形成して弁箱３を構成し、そして、その内径な弁箱３の
流路径にほぼ等しくした筒状の弁体６に、その筒軸芯に
対して軸芯を直交く抗状態で弁棒７を設け、その弁棒７
の一端側を弁箱本体３ｂから貫通させて弁箱３に弁体６
を回転自在に軸架すると共へ、弁体６０両端側外周部ぺ
前記弁箱側弁座５．５に圧接する弾性撓み変形自在な弁
体シート８．８を設けてあり、もって、前記弁箱３から
突出した弁棒７の端部に運動連結した弁開閉機構９の操
作により、弁体６を駆動回動して流路Ｒを開閉するべく
弁を構成しである。The valve body portions 3a, 3a provided with flanges 2.2 for connection to various fluid transport pipes 1, 1 and the valve body body 3b are separably connected by bolts via O-rings 4, 4, and
The inside of the valve body portions 3a, 3a is machined into a spherical surface with a smaller diameter than the inner diameter of the valve body body 3b to form spherical valve body side valve seats 5, 5 to constitute the valve body 3. A valve rod 7 is provided on a cylindrical valve body 6 whose inner diameter is approximately equal to the flow path diameter of the valve box 3, with its axis perpendicular to the cylinder axis.
The valve body 6 is inserted into the valve body 3 by passing one end through the valve body 3b.
The valve body 60 is rotatably supported on its shaft, and an elastically deformable valve body seat 8.8 is provided which presses the outer circumferential portion of the valve body 60 against the valve box side valve seat 5.5. The valve is configured to open and close the flow path R by rotating the valve element 6 by operating a valve opening/closing mechanism 9 which is movably connected to the end of the valve rod 7 protruding from the box 3.

前記弁体６に付設のシート８，８夫々は、円板状に構成
されると共に、その径方向中心側の肉厚を犬に構成し、
その肉厚の大きい部分において、シート８の弁体６に対
する取付部１０を設け、かつ、取付部１０から径方向外
方部分を肉厚薄くして弾性撓み変形自在に構成しである
。Each of the seats 8, 8 attached to the valve body 6 is configured in the shape of a disk, and has a wall thickness on the radially center side of the disk.
A mounting portion 10 for the valve body 6 of the seat 8 is provided in the thick portion, and a portion radially outward from the mounting portion 10 is made thinner so as to be elastically deformable.

前記弁体シート８，８夫々の、取付部１０と弁箱側弁座
５への接触部１１との径方向中間所定筒所に対応位置さ
せて、弁体６から弁体シート支え１２を一体延設し、弁
体シート８を接当により受止め、流体圧を受けて弁体シ
ート８が移動及び撓み変形するのを規制すると共に、取
付部１０と支持部材１２による受止め位置との間におい
て作用する流体圧を、弁体シート支え１２による受止め
位置を支点として、弁体シート８を接触部１１が弁箱側
弁座５に圧接する側に撓み変形させるべく作用させ、弁
体シート８を弁箱側弁座５に圧接できるように構成しで
ある。The valve body seat support 12 is integrally attached from the valve body 6 to a predetermined cylindrical position radially intermediate between the mounting portion 10 and the contact portion 11 to the valve box side valve seat 5 of each of the valve body seats 8, 8. The valve body seat 8 is extended, receives the valve body seat 8 by abutting, regulates movement and bending deformation of the valve body seat 8 in response to fluid pressure, and is located between the mounting portion 10 and the receiving position by the support member 12. The fluid pressure acting on the valve body is applied to bend and deform the valve body seat 8 to the side where the contact portion 11 comes into pressure contact with the valve body side valve seat 5, using the receiving position by the valve body seat support 12 as a fulcrum, and the valve body seat 8 can be pressed against the valve seat 5 on the valve box side.

前記取付部１０に取付ボルト１３を挿通し、弁体シート
８を、その弁中心方向への相対移動を許容すると共にダ
ブルナツト１４を介して逆方向への相対移動を規制した
状態で弁体６に取付けてあり、閉弁時において、そこへ
の上流側流体圧に起因して弁体シート８を微小移動させ
、接触部１１を弁箱側弁座５に圧接させる側により一層
撓み変形させられるように構成しである 上述構成の結果、閉弁時において、そこにかかる流体圧
を利用して弁体シート８を撓み変形さ七弁箱側弁座５に
圧接して十分なシール効果を得る事ができ、又、たとえ
、流体が一部洩れたとしても、下流側に位置する弁体シ
ート８に対しては、流体圧全体が弁体シート８を弁箱側
弁座５に玉楼させる側に作用し、流路Ｒの完全遮断を行
えるものである。The mounting bolt 13 is inserted into the mounting portion 10, and the valve body seat 8 is attached to the valve body 6 while allowing relative movement toward the valve center and restricting relative movement in the opposite direction via the double nut 14. When the valve is closed, the valve body seat 8 is slightly moved due to the fluid pressure on the upstream side, so that the contact portion 11 is more flexibly deformed on the side where the contact portion 11 is pressed against the valve seat 5 on the valve box side. As a result of the above-mentioned structure, when the valve is closed, the valve body seat 8 is flexibly deformed by using the fluid pressure applied thereto and pressed against the valve box side valve seat 5 to obtain a sufficient sealing effect. Even if some of the fluid leaks, the entire fluid pressure will be applied to the valve seat 8 located on the downstream side to the side that causes the valve seat 8 to converge on the valve seat 5 on the valve box side. This allows the flow path R to be completely shut off.

図中１５は、閉弁状態での接触部１１に対応位置させて
、弁箱３を貫通して設けたシール川流付供給路であり、
閉弁時に、接触部１１に全周にわたって穿設した環状溝
１６と弁箱側弁座５間に形成される空間内に、エアーコ
ンプレッサー等の圧力流体供給装置１７を介してシール
用流体を供絽し、シール効果をより高めるべく構成しで
ある。15 in the figure is a seal flow supply path provided through the valve box 3 at a position corresponding to the contact portion 11 in the valve closed state;
When the valve is closed, a sealing fluid is supplied through a pressure fluid supply device 17 such as an air compressor into the space formed between the annular groove 16 bored all around the contact portion 11 and the valve seat 5 on the valve box side. It is designed to further enhance the sealing effect.

第３図は、別実施例を示し、弁体シート８の弁体６への
取付部１０を弁体シート８の中心箇所に設け、必要最小
限の夫々１個のボルト１３及びダブルナツト１４でもっ
て取付けられるように構成したものである。FIG. 3 shows another embodiment, in which the mounting portion 10 of the valve body seat 8 to the valve body 6 is provided at the center of the valve body seat 8, and is attached using the minimum necessary number of bolts 13 and double nuts 14. It is configured so that it can be installed.

第４図は、取付部１０に対する変形例を示し、前記取付
ボルト１３のダブルナツト１４側の全体を囲繞する状態
で、キャップ１８をシート８に着脱自在に螺着してあり
、取付部１０からの流体の洩れを良好に回避できるよう
に構成しである。FIG. 4 shows a modification of the mounting part 10, in which a cap 18 is removably screwed onto the seat 8 in a state surrounding the entire double nut 14 side of the mounting bolt 13, and the cap 18 is detachably screwed onto the seat 8. The structure is such that fluid leakage can be effectively avoided.

尚、前記弁体シート支え１２を設けるのに、弁体シート
支え１２による弁体シート８受止め位置は、接触部１１
の移動が最大となる位置が好ましいが、適宜変更可能で
ある。In addition, when the valve body seat support 12 is provided, the valve body seat 8 is received by the valve body seat support 12 at a position where the valve body seat 8 is received by the contact portion 11.
The position where the movement of is maximum is preferable, but it can be changed as appropriate.

又、前記弁体シート８としては、上述第一の実施例のよ
うに、円形状で、閉弁時に弁体シート８自体で弁箱３の
内部空間を全体的に遮断するものに限らず、環状で弁体
シート８と弁体６の一部をして遮断するように構成する
ものでも良い本発明は、上述実施例のような、いわゆる
ボール型の弁に限らず、二枚型の偏芯バタフライ弁であ
るとかスライド弁、あるいは、浄水場等に使用される弁
扉等各種の弁に適用可能である。Further, the valve body seat 8 is not limited to one having a circular shape and completely blocking the internal space of the valve body 3 when the valve is closed, as in the above-mentioned first embodiment. The present invention is not limited to the so-called ball-shaped valve as in the above-mentioned embodiment, and can also be configured to have an annular shape so as to partially block the valve element seat 8 and the valve element 6. It can be applied to various valves such as core butterfly valves, slide valves, and valve doors used in water purification plants.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図乃至第４図の図面は本発明に係る弁のシール構造
の実施例を示し、第１図は弁の閉弁状態を示す全体縦断
面図、第２図は要部の拡大縦断面図、第３図は別実施例
を示す要部の断面図、第４図は取付部の変形例を示す断
面図、第５図は従来例を示す断面図である。 ３・・・・・・弁箱、５・・・・・・弁箱側弁座、６・
・・・・・弁体、８・・・・・・弁体シート、１２・・
・・・・弁体シート支え。1 to 4 show an embodiment of the valve seal structure according to the present invention, FIG. 1 is an overall vertical sectional view showing the valve in the closed state, and FIG. 2 is an enlarged vertical sectional view of the main part. 3 are sectional views of essential parts showing another embodiment, FIG. 4 is a sectional view showing a modified example of the mounting portion, and FIG. 5 is a sectional view showing a conventional example. 3... Valve box, 5... Valve box side valve seat, 6...
... Valve body, 8... Valve body seat, 12...
...Valve seat support.

Claims (1)

【特許請求の範囲】[Claims] １ 弁箱３側の弁座５に対し下流側から上流側に向かう
方向で当接して閉弁する弾性板状の弁体シート８を備え
ている弁であって、前記弾性板状の弁体シート８の下流
側の面に対し、弁体シート８が弁箱側弁座５に当接する
部位よりも中心側寄りでかつ前記当接部位の近傍に相当
する箇所において当接する環状の弁体シート支え１２が
弁体６に取付けられているとともに、この環状の弁体シ
ート支え１２の弁体シート８に対する当接部位より中心
側において弁体シート８が閉弁時に流体から受ける力に
よって、この弁体シート８の外周辺部が前記弁体シート
支え１２を支点として弁体シート面に略々垂直な方向に
曲り変形し前記弁箱側シート５に接する曲げ力を受ける
ように、前記弁体シート支え１２の弁体シート８に対す
る当接部位および弁体シート８が構成されていることを
特徴とする弁のシール構造。1 A valve equipped with an elastic plate-shaped valve body seat 8 that contacts a valve seat 5 on a valve box 3 side in a direction from the downstream side to the upstream side to close the valve, the elastic plate-shaped valve body An annular valve element seat that contacts the downstream surface of the seat 8 at a location closer to the center than the area where the valve element seat 8 contacts the valve box side valve seat 5 and corresponds to the vicinity of the contact area. A support 12 is attached to the valve body 6, and the force that the valve body seat 8 receives from the fluid when the valve is closed is applied to the valve body at the center side of the contact area of the annular valve body seat support 12 with respect to the valve body seat 8. The valve body seat 8 is bent such that the outer peripheral portion of the body seat 8 is bent and deformed in a direction substantially perpendicular to the valve body seat surface using the valve body seat support 12 as a fulcrum and receives a bending force in contact with the valve body side seat 5. A valve seal structure characterized in that a contact portion of the support 12 with respect to the valve body seat 8 and the valve body seat 8 are configured.