JP5221398B2 - Steam valve device and power generation equipment provided with the same - Google Patents

Steam valve device and power generation equipment provided with the same Download PDF

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JP5221398B2
JP5221398B2 JP2009002768A JP2009002768A JP5221398B2 JP 5221398 B2 JP5221398 B2 JP 5221398B2 JP 2009002768 A JP2009002768 A JP 2009002768A JP 2009002768 A JP2009002768 A JP 2009002768A JP 5221398 B2 JP5221398 B2 JP 5221398B2
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seal member
steam
valve device
valve stem
steam valve
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JP2010159829A (en
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蔵 進藤
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Toshiba Corp
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Description

本発明は、蒸気タービンの蒸気弁装置およびそれを備えた発電設備に関する。   The present invention relates to a steam valve device for a steam turbine and a power generation facility including the same.

蒸気タービンを備えた発電設備としては、図19に示すような構成例のものがある。   As a power generation facility provided with a steam turbine, there is a configuration example as shown in FIG.

図19において、ボイラー700からの蒸気は主蒸気止め弁701、蒸気加減弁702を通過し、高圧タービン710で仕事をした後、逆止弁707を経由して再びボイラ−700の再熱器にて加熱され、再蒸気止め弁703、インターセプト弁704を経て中圧タービン711、低圧タービン712へ流入して仕事をする。そして、低圧タービン712より流出した蒸気は復水器713により水に戻され、給水ポンプ714にて昇圧して再びボイラー700に供給されるという、循環系が形成されている。   In FIG. 19, the steam from the boiler 700 passes through the main steam stop valve 701 and the steam control valve 702, works on the high-pressure turbine 710, and then returns to the boiler 700 reheater again via the check valve 707. It is heated and flows into the intermediate pressure turbine 711 and the low pressure turbine 712 through the re-steam stop valve 703 and the intercept valve 704 to work. The steam that flows out from the low-pressure turbine 712 is returned to water by the condenser 713, and is pressurized by the feed water pump 714 to be supplied to the boiler 700 again.

また、プラントの運用効率を高めるために、プラントによっては、主蒸気止め弁701の流入側とボイラー700の再熱器の流入側とを結ぶ流路に設けられた高圧タービンバイパス弁705やボイラー700の再熱器の流出側と復水器713との間に接続された流路に低圧タービンバイパス弁706が設置され、タービンの運転に係わらずボイラー系単独の循環運転ができるようになっている。   Further, in order to increase the operation efficiency of the plant, depending on the plant, the high-pressure turbine bypass valve 705 or the boiler 700 provided in the flow path connecting the inflow side of the main steam stop valve 701 and the inflow side of the reheater of the boiler 700 may be used. A low-pressure turbine bypass valve 706 is installed in the flow path connected between the outlet side of the reheater and the condenser 713 so that the boiler system can be circulated independently of the operation of the turbine. .

図18は、上述した蒸気タービンに使用されている蒸気加減弁702の従来構造を示す断面図である。   FIG. 18 is a cross-sectional view showing a conventional structure of a steam control valve 702 used in the steam turbine described above.

この蒸気加減弁702は、図18に示すように図示しないボイラー等からの蒸気が流入する蒸気入口部Iとこの蒸気入口部とは直交する方向に蒸気を流出させる蒸気出口部Oとを有する蒸気弁本体200と、この蒸気弁本体200の上面開口部を閉塞する上蓋202とを備え、蒸気弁本体200内部の蒸気出口部側に弁座203が設けられ、この弁座203に当接する弁体204が上蓋202を貫通させて蒸気弁本体200内部に挿入された弁棒205の先端部に取付けられている。この弁棒205は上蓋202に支持された油圧駆動機構206に連結されている。この場合、上蓋202の弁棒205の貫通部は、摺動面となることからこの部分にブッシュ201が設けられている。   As shown in FIG. 18, the steam control valve 702 has a steam inlet I through which steam from a boiler or the like (not shown) flows and a steam outlet O through which steam flows out in a direction perpendicular to the steam inlet. A valve body 200 and an upper lid 202 that closes the upper surface opening of the steam valve body 200 are provided. A valve seat 203 is provided on the steam outlet side of the steam valve body 200, and the valve body is in contact with the valve seat 203. 204 is attached to the tip of a valve rod 205 inserted through the upper lid 202 and inserted into the steam valve main body 200. The valve stem 205 is connected to a hydraulic drive mechanism 206 supported by the upper lid 202. In this case, since the penetrating portion of the valve stem 205 of the upper lid 202 serves as a sliding surface, the bush 201 is provided at this portion.

このような構造の蒸気加減弁702において、油圧駆動機構206により弁棒205が上下方向に駆動されると弁体204が弁座203と当接又は開離することで、開閉動作をなし、蒸気タービンへ流れる蒸気量の制御により、蒸気タービンの回転数が制御される。   In the steam control valve 702 having such a structure, when the valve rod 205 is driven in the vertical direction by the hydraulic drive mechanism 206, the valve body 204 contacts or separates from the valve seat 203, thereby performing an opening / closing operation. The rotation speed of the steam turbine is controlled by controlling the amount of steam flowing to the turbine.

ところで、かかる従来の蒸気加減弁において、弁棒205の摺動面となるブッシュ201の内径と弁棒205の外径との間隙寸法は、
(1)弁棒205とブッシュ201の材料組合せによる熱の伸び差
(2)予定された運転期間から予想される弁棒205およびブッシュ201への酸化スケールの付着量
により弁棒205の往復動を阻害しない程度に大きな寸法に決定されており、概ね1mm以下が採用されている。
By the way, in such a conventional steam control valve, the gap dimension between the inner diameter of the bush 201 serving as the sliding surface of the valve rod 205 and the outer diameter of the valve rod 205 is:
(1) Thermal expansion difference due to the material combination of the valve stem 205 and the bush 201 (2) The valve stem 205 is reciprocated by the amount of oxide scale adhering to the valve stem 205 and the bush 201 predicted from the scheduled operation period. The size is determined to be large enough not to obstruct, and approximately 1 mm or less is adopted.

したがって、通常運転においては、ブッシュ201と弁棒205の間隙を通して蒸気室から大気側に向って蒸気が常に漏洩していることになる。   Therefore, in normal operation, steam always leaks from the steam chamber toward the atmosphere through the gap between the bush 201 and the valve rod 205.

さらに、最近では蒸気圧力や蒸気温度条件が上昇しており、上述の(1)と(2)の理由から益々ブッシュ201と弁棒205の間隙寸法が拡大し、結果的に蒸気漏洩量が増加する傾向にある。   Furthermore, the steam pressure and steam temperature conditions have recently increased, and the gap size between the bush 201 and the valve stem 205 has been increased due to the reasons (1) and (2) described above, resulting in an increase in the amount of steam leakage. Tend to.

また、更に最近の蒸気タービンは、同業他社との受注競争や発電事業主らによる市場からの要求として性能向上(効率向上)が強く求められている。   In addition, more recent steam turbines are strongly required to improve performance (improve efficiency) as demand from the competition by other companies in the same industry and demand from the power generation business.

この蒸気タービンの性能向上の内訳として、蒸気タービンそのものの内部効率もあるが、蒸気タービンの入口に設置された蒸気弁の弁棒部分から無駄に漏洩する蒸気は、熱力学に有効な仕事をする前に蒸気タービンに流入する蒸気流量を減少させることを意味し、結果的に蒸気タービンの効率に大きな影響(効率低下)を与えることであり、これら弁棒部分からの漏洩蒸気量を如何に低減するかが永年の懸案であった。   The breakdown of the performance improvement of this steam turbine is the internal efficiency of the steam turbine itself, but the steam that leaks wastefully from the valve stem part of the steam valve installed at the inlet of the steam turbine does effective work in thermodynamics. This means that the flow rate of steam that flows into the steam turbine before is reduced, and as a result, it greatly affects the efficiency of the steam turbine (decrease in efficiency). It was a long-standing concern to do.

このような弁棒部分からの漏洩蒸気量を低減するための技術としては、すでに米国にて公開されている(特許文献1)
US2006/0175567(Aug,10,2006)
As a technique for reducing the amount of leaked steam from the valve stem portion, it has already been published in the United States (Patent Document 1).
US2006 / 0175567 (Aug, 10,2006)

しかし、この技術では、ブッシュの内面にリングを設けるだけの構造なので、運転開始直後は一時的に漏洩蒸気量を低減することが可能でも、経年的に弁棒外径やリング内径への酸化スケールの付着量により間隙が減少し、弁棒の往復動を阻害してしまうという不適合の発生が容易に想定される。   However, this technology has a structure in which a ring is simply provided on the inner surface of the bush, so that it is possible to temporarily reduce the amount of leaked steam immediately after the start of operation. The gap is reduced by the amount of adhering, and the occurrence of incompatibility that hinders the reciprocation of the valve stem is easily assumed.

本発明は、上記のような事情に鑑みてなされたもので、弁棒とブッシュとの間隙よりも狭いシール部材を新たに設けて大気側への漏洩蒸気量を低減することができる蒸気弁装置およびそれを備えた発電設備を提供することを目的とする。   The present invention has been made in view of the above circumstances, and a steam valve device capable of reducing the amount of steam leaked to the atmosphere by newly providing a seal member narrower than the gap between the valve stem and the bush. And it aims at providing the power generation equipment provided with it.

本発明は、上記の目的を達成するため、次のような手段により蒸気弁装置を構成するものである。   In order to achieve the above object, the present invention constitutes a steam valve device by the following means.

すなわち、蒸気入口部及び蒸気出口部を有する蒸気弁本体と、この蒸気弁本体の上面開口部を閉塞する上蓋と、この上蓋の大気側から前記蒸気弁本体内の蒸気室に貫通させて設けられ先端部に有する弁体により前記蒸気出口部より流出する蒸気流量を制御する弁棒と、この弁棒が貫通する前記上蓋の貫通穴に前記弁棒が軸方向に往復動するに適正な間隙を存するように設けられたブッシュとを備えた蒸気弁装置において、前記上蓋の蒸気室側に貫通する弁棒の周囲に、前記弁棒の外表面に接触するように配置された環状のシール部材を備え、前記環状のシール部材は、前記弁棒との接触部に前記弁棒に対する径方向に複数本のスリットが設けられて複数個のシール部材片に分割され、前記シール部材片の端部が球面形状であり、この端部の球面部分が往復動する前記弁棒に突き当たって接触することを特徴とする。 That is, a steam valve body having a steam inlet and a steam outlet, an upper lid that closes the upper surface opening of the steam valve body, and a steam chamber in the steam valve body that penetrates from the atmosphere side of the upper lid is provided. A valve rod that controls the flow rate of the steam flowing out from the steam outlet portion by a valve body at the tip portion, and an appropriate gap for reciprocating the valve rod in the axial direction in the through hole of the upper lid through which the valve rod passes. in a steam valve apparatus that includes a bush which is provided so as to lie, in the periphery of the valve stem that penetrates the vapor chamber side of the upper cover, the arranged annular seal member so as to contact with the outer surface of the valve stem The annular seal member is divided into a plurality of seal member pieces by providing a plurality of slits in a radial direction with respect to the valve stem at a contact portion with the valve stem, and an end portion of the seal member piece is Spherical shape, this end sphere Moiety is characterized that you contact abuts on the valve stem to reciprocate.

本発明によれば、弁棒とブッシュとの間隙よりも狭いシール部材を新たに設けて大気側への漏洩蒸気量を低減することができるので、従来のリング構造のものと比較して、現実的に発生する弁棒表面への酸化スケールの付着に対しても有効であり、更には既設の蒸気弁装置についても容易にシール部材の追設が可能なことから、既設蒸気タービンの効率を向上させることが可能となり、さらに発電設備全体の効率を向上させることができる。   According to the present invention, a seal member that is narrower than the gap between the valve stem and the bush can be newly provided to reduce the amount of leaked steam to the atmosphere side. In addition, it is effective against the adhesion of oxidized scale to the surface of the valve stem that is generated, and it is possible to easily add a seal member to the existing steam valve device, improving the efficiency of the existing steam turbine. It is possible to improve the efficiency of the entire power generation facility.

以下、本発明の実施形態を図面を参照して説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(第1の実施形態)
図1(a),(b)は本発明による蒸気弁装置の第1の実施形態における要部を示し、(a)は断面図、(b)は(a)に示すシール部材のスリット部分の一部と弁棒をA矢方向から見た図、図2は図1におけるシール部材の半部を拡大して示す斜視図である。
(First embodiment)
1 (a) and 1 (b) show a main part of the first embodiment of the steam valve device according to the present invention, (a) is a sectional view, and (b) is a slit part of the seal member shown in (a). FIG. 2 is a perspective view showing an enlarged half of the seal member in FIG. 1.

なお、図18に示す蒸気加減弁と同一構成部品には同一符号を付してその説明を省略し、ここでは異なる点について述べる。   The same components as those of the steam control valve shown in FIG. 18 are denoted by the same reference numerals, and the description thereof is omitted. Different points will be described here.

第1の実施形態では、図1に示すように弁棒205の外径とこの弁棒205が貫通する上蓋202の貫通穴に設けられたブッシュ201の内径との間隙寸法は従来設計のままとして、上蓋202の蒸気室側に対応する弁棒205の貫通部分の周囲面にシール部材301を複数本のボルト302により取付けるものである。   In the first embodiment, as shown in FIG. 1, the gap dimension between the outer diameter of the valve stem 205 and the inner diameter of the bush 201 provided in the through hole of the upper lid 202 through which the valve stem 205 passes is kept as in the conventional design. The sealing member 301 is attached by a plurality of bolts 302 to the peripheral surface of the penetrating portion of the valve rod 205 corresponding to the steam chamber side of the upper lid 202.

このシール部材301は、図2に示すように弁棒205に対する内周側部分がリング状であり、その弁棒205に相対する内周部(接触部)304の内径寸法は、弁棒205とブッシュ201との間隙よりも狭く、好ましくは弁棒205との間に間隙を持たず常時接触するように構成されている。なお、図2に示した本実施形態では内周部304が弁棒205に常時接触する接触部304を構成している例を示している。   As shown in FIG. 2, the seal member 301 has a ring-shaped inner peripheral portion with respect to the valve stem 205, and the inner diameter of the inner peripheral portion (contact portion) 304 facing the valve stem 205 is the same as that of the valve stem 205. It is narrower than the gap with the bush 201, and is preferably configured to always contact with the valve stem 205 without any gap. In the present embodiment shown in FIG. 2, an example is shown in which the inner peripheral portion 304 constitutes the contact portion 304 that always contacts the valve stem 205.

また、内周部(接触部)304部分には、放射状に複数個に分割するように切り込み加工されたスリット部303が形成されている。この場合、分割のための一つの切り込み加工幅は、例えばワイヤーカット加工により0.1mm以下とし、さらには当該スリット部303は漏洩蒸気の通路となるため、限りなく小さく0.05mm以下が好ましい。また、スリット部の長さや厚み、分割数については、シール部材301の材質やその強度に係わる設計要素により定められるので、任意とする。   In addition, a slit portion 303 is formed in the inner peripheral portion (contact portion) 304 portion so as to be cut into a plurality of pieces radially. In this case, one cutting width for division is set to 0.1 mm or less by, for example, wire cutting, and further, the slit portion 303 becomes a passage for leaked steam, and is preferably as small as 0.05 mm or less. Further, the length, thickness, and number of divisions of the slit portion are arbitrary because they are determined by the material of the seal member 301 and the design factors related to its strength.

さらに、弁棒205の往復動により酸化スケールが通過する時のシール部材301への噛み込みを防止するために、シール部材301の接触部304の端部は球面形状にしている。   Furthermore, in order to prevent the seal member 301 from being caught when the oxide scale passes due to the reciprocating motion of the valve stem 205, the end portion of the contact portion 304 of the seal member 301 has a spherical shape.

また、シール部材301の材質は、ブッシュ201内径と弁棒205の外径による間隙を変化させないために、弁棒205と膨張係数が等しく、好ましくは弁棒205と同一材質であることが望ましい。   Further, the seal member 301 is made of the same material as that of the valve stem 205, preferably the same material as the valve stem 205, so that the gap between the inner diameter of the bush 201 and the outer diameter of the valve stem 205 is not changed.

さらに、シール部材301の内面は、弁棒205の往復動による摩耗防止のために窒化による表面硬化処理、又は酸化スケールが付着し難い材質である一般にステライトの商標名にて市販されているコバルト基硬質合金が盛金されるか、または弁棒205と常時接触状態を保つため、シール部材301の内面へ酸化スケールが付着しないようにシール部材301そのものをコバルト基硬質合金にて製作することも可能である。   Further, the inner surface of the seal member 301 has a cobalt base commercially available under the trade name of Stellite, which is a material hard to adhere to a surface hardening treatment by nitriding or oxide scale to prevent wear due to reciprocating movement of the valve stem 205. Since the hard alloy is deposited or always kept in contact with the valve stem 205, the seal member 301 itself can be made of a cobalt-based hard alloy so that the oxide scale does not adhere to the inner surface of the seal member 301. It is.

このような構成のシール部材301を上蓋202の蒸気室側に対応する弁棒205の貫通部分の周囲面に複数本のボルト302により取付け、放射状(すなわち、弁棒205に対する径方向)に複数個に分割するように切り込み加工されてスリット部303が形成された接触部304を弁棒205との間に間隙を持たず常時接触させることにより、弁棒205の外表面に経年的に酸化スケールが付着しても、シール部材301は常時弁棒205に接触しながらスリット部303で分割された1片毎に又は該当する複数片がこれら酸化スケールを乗り越えるように弾性変形する。したがって、弁棒205の往復動を阻害(拘束)することはない。   A plurality of seal members 301 having such a configuration are attached to the peripheral surface of the penetrating portion of the valve stem 205 corresponding to the steam chamber side of the upper lid 202 by a plurality of bolts 302, and a plurality of seal members 301 are arranged radially (that is, in the radial direction with respect to the valve stem 205). The contact portion 304 formed with the slit portion 303 by being cut so as to be divided into two parts is always in contact with the valve stem 205 without any gap, so that an oxide scale is formed on the outer surface of the valve stem 205 over time. Even if the seal member 301 adheres, the seal member 301 is elastically deformed so that each piece divided by the slit portion 303 or the corresponding plural pieces get over these oxide scales while always contacting the valve rod 205. Therefore, the reciprocation of the valve stem 205 is not hindered (restrained).

ここで、本発明の第1の実施形態におけるシール部材301と従来における漏洩蒸気量、すなわち漏洩蒸気の通路となる断面積の概略比較を行うと次の通りである。   Here, it is as follows when the seal member 301 in the 1st Embodiment of this invention and the amount of leakage steam in the past, ie, the cross-sectional area used as the passage of leakage steam, are compared roughly.

従来:弁棒外径=Φ100mm、ブッシュ内径=Φ100.5mmより
弁棒とブッシュの間隙断面積= 78mm2
第1の実施形態:分割数=36、スリット幅(加工幅)=0.05mm、スリット長さ10mmより
スリット部の総断面積=18mm(弁棒とシール部材の間隙はゼロ)
このように従来に比べて漏洩蒸気の通路となる断面積は格段に小さく、実際には流量係数等も加味される(本実施形態の形状の方が流量係数は悪い)ため、漏洩蒸気は確実に低減する。
Conventional: From valve stem outer diameter = Φ100mm, bush inner diameter = Φ100.5mm, clearance cross-sectional area between valve stem and bush = 78mm 2
First Embodiment: From the number of divisions = 36, slit width (processing width) = 0.05 mm, and slit length of 10 mm
Total cross-sectional area of slit = 18mm (Zero between valve stem and seal member)
In this way, the cross-sectional area that becomes the passage of leaked steam is much smaller than in the past, and actually the flow coefficient is taken into account (the flow coefficient is worse in the shape of this embodiment), so the leaked steam is surely To reduce.

さらには、スリット部303の切り込み部分にも経年的に酸化スケールが付着し、当該加工幅も減少する傾向となることから、初期段階と比べれば本実施形態のシール部材301の構造では時間経過とともに漏洩蒸気量は減少方向となる。   Furthermore, since oxide scale adheres to the cut portion of the slit portion 303 over time and the processing width tends to decrease, the structure of the seal member 301 according to the present embodiment has a lapse of time as compared with the initial stage. The amount of leaked steam is decreasing.

このように本発明の第1の実施形態によれば、永年の懸案であった弁棒部分からの漏洩蒸気量を低減することができ、先に公開されている特許文献1に示されたリング構造のものに比較して、現実的に発生する弁棒表面への酸化スケールの付着事象に対して有効である。   As described above, according to the first embodiment of the present invention, it is possible to reduce the amount of leaked steam from the valve stem portion, which has been a long-standing concern, and the ring disclosed in Patent Document 1 previously published. Compared to the structure, it is effective against the phenomenon of oxide scale adhesion to the valve stem surface that occurs in reality.

更には、既設の蒸気弁装置についても容易にシール部材の追設が可能なことから、既設蒸気タービンの効率を向上させることができるため、これら既設の発電設備においても発電設備全体の効率を向上させることができる。   Furthermore, since it is possible to easily add a seal member to the existing steam valve device, the efficiency of the existing steam turbine can be improved, so that the efficiency of the entire power generation facility is improved even in these existing power generation facilities. Can be made.

(第2の実施形態)
図3は本発明による蒸気弁装置の第2の実施形態における要部を示す断面図で、図1と同一構成部品には同一符号を付してその説明を省略し、ここでは異なる部分について述べる。
(Second Embodiment)
FIG. 3 is a cross-sectional view showing the main part of the second embodiment of the steam valve device according to the present invention. The same components as those in FIG. .

第2の実施形態では、図3に示すように上蓋202の蒸気室側に対応する弁棒205の貫通部分の周囲面に取付けられるシール部材301として、放射状(すなわち、弁棒205に対する径方向)に複数個のスリット部303がそれぞれ形成されたリング状の接触部304a,304bを弁棒205の外表面と接するように弁棒205の往復動方向に2段列にして設けたものである。   In the second embodiment, as shown in FIG. 3, the seal member 301 attached to the peripheral surface of the penetrating portion of the valve rod 205 corresponding to the steam chamber side of the upper lid 202 is radial (that is, radial direction with respect to the valve rod 205). The ring-shaped contact portions 304 a and 304 b each having a plurality of slit portions 303 are provided in two rows in the reciprocating direction of the valve rod 205 so as to contact the outer surface of the valve rod 205.

当該シール部材301に作用する差圧は、蒸気室側(上流)が定格蒸気圧力、ブッシュ201側(下流)が大気圧力となり、それらから最大差圧となる可能性があり、各スリット部の微小なスリットの切り込み幅から漏洩する蒸気は臨界状態となって作用すると微小なスリットの切り込み部分に侵食の発生も懸念される。   The differential pressure acting on the seal member 301 may be the rated steam pressure on the steam chamber side (upstream) and the atmospheric pressure on the bush 201 side (downstream), and may be the maximum differential pressure from these. When the steam leaking from the slit width of the slit acts in a critical state, there is a concern that erosion may occur at the slit portion of the minute slit.

本実施形態では、シール部材301に弁棒205の往復動方向に2段列にしてリング状の接触部304a,304bを設けているので、上記第1の実施形態と同様の作用効果に加えて、当該シール部材301に作用する差圧を減少させることができる。   In this embodiment, since the seal member 301 is provided with the ring-shaped contact portions 304a and 304b in two stages in the reciprocating direction of the valve rod 205, in addition to the same effects as the first embodiment. The differential pressure acting on the seal member 301 can be reduced.

上記ではシール部材301に弁棒205の往復動方向に2段列にしてリング状の接触部304a,304bを設けたが、好ましくは3段列以上の接触部を設けることにより、多段オリフィス機能を持たせることが可能となり、当該シール部材の微小なスリットの切り込み幅から漏洩する蒸気量は、単段列、2段列に比べてさらに減少することは明白である。   In the above description, the ring-shaped contact portions 304a and 304b are provided in the seal member 301 in two rows in the reciprocating direction of the valve rod 205. However, the multi-stage orifice function is preferably provided by providing contact portions in three or more rows. It is obvious that the amount of steam leaking from the cut width of the minute slit of the sealing member is further reduced as compared with the single-stage row and the 2-stage row.

(第3の実施形態)
図4は本発明による蒸気弁装置の第3の実施形態における要部を示す断面図で、図1と同一構成部品には同一符号を付してその説明を省略し、ここでは異なる部分について述べる。
(Third embodiment)
FIG. 4 is a cross-sectional view showing the main part of a third embodiment of the steam valve device according to the present invention. The same components as in FIG. .

第3の実施形態では、図4に示すようにシール部材301の外側面(上蓋202との取付け面とは反対側の面)に中空円板状の保護カバー305を配置してシール部材301と一体的に上蓋202にボルト302により取付けるようにしたものである。この場合、保護カバー305の内径はブッシュ201の内径より大きく設定してあるので、弁棒205と接触することはない。   In the third embodiment, as shown in FIG. 4, a hollow disk-shaped protective cover 305 is disposed on the outer surface of the seal member 301 (the surface opposite to the mounting surface with the upper lid 202). The upper cover 202 is integrally attached with a bolt 302. In this case, since the inner diameter of the protective cover 305 is set larger than the inner diameter of the bush 201, it does not come into contact with the valve stem 205.

このような構成とすれば、上記第1の実施形態と同様の作用効果に加えて、蒸気弁本体の蒸気入口から蒸気とともに異物が流入しても、保護カバー305により保護されているので、シール部材301が異物により破損することを防止できる。   With such a configuration, in addition to the same effect as the first embodiment, even if foreign matter flows in along with the steam from the steam inlet of the steam valve main body, it is protected by the protective cover 305. The member 301 can be prevented from being damaged by foreign matter.

(第4の実施形態)
図5は本発明による蒸気弁装置の第4の実施形態における要部を示す断面図で、図4と同一構成部品には同一符号を付してその説明を省略し、ここでは異なる部分について述べる。
(Fourth embodiment)
FIG. 5 is a cross-sectional view showing the main part of the fourth embodiment of the steam valve device according to the present invention. The same components as those in FIG. .

前述した蒸気弁装置においては、上蓋202を貫通する弁棒205の外径とこの弁棒205の上蓋202の貫通部に設けられたブッシュ201の内径との間隙寸法は大きいため、弁棒205が往復動するときに弁棒205がその軸方向と直交する方向に揺動する可能性がある。   In the steam valve device described above, since the gap between the outer diameter of the valve rod 205 penetrating the upper lid 202 and the inner diameter of the bush 201 provided in the penetrating portion of the upper lid 202 of the valve rod 205 is large, When reciprocating, the valve stem 205 may swing in a direction orthogonal to the axial direction.

これに対して、前述した各実施形態によれば、シール部材301の内面は弁棒205と接触するように組立られ、且つ上蓋202に固定された構造であるため、弁棒205が揺動する動きに追従することができない。   On the other hand, according to each of the embodiments described above, the inner surface of the seal member 301 is assembled so as to contact the valve stem 205 and is fixed to the upper lid 202, so that the valve stem 205 swings. I can't follow the movement.

そこで、第4の実施形態では、図5に示すように内径側に弁棒205との対向面が開口する環状凹部402aを形成したシール部材本体402の環状凹部402a内に弁棒205の往復動方向と直交する方向にスライド可能に、且つ放射状に複数個のスリット部303を形成したリング状の接触部304が弁棒205の外表面と接するようにシール部材401を設け、さらにシール部材本体402の外側面(上蓋202との取付け面とは反対側の面)に中空円板状の保護カバー305を配置してシール部材本体402と一体的に上蓋202にボルト302により取付けるようにしたものである。この場合、保護カバー305の内径はブッシュ201の内径より大きく設定してあるので、弁棒205と接触することはない。   Therefore, in the fourth embodiment, as shown in FIG. 5, the valve rod 205 is reciprocated in the annular recess 402a of the seal member main body 402 in which the annular recess 402a having an opening facing the valve rod 205 is formed on the inner diameter side. A seal member 401 is provided so that a ring-shaped contact portion 304 formed with a plurality of radial slit portions 303 is in contact with the outer surface of the valve stem 205, and is slidable in a direction orthogonal to the direction. A hollow disk-shaped protective cover 305 is disposed on the outer side surface (the surface opposite to the mounting surface with the upper lid 202), and is attached to the upper lid 202 integrally with the sealing member body 402 with bolts 302. is there. In this case, since the inner diameter of the protective cover 305 is set larger than the inner diameter of the bush 201, it does not come into contact with the valve stem 205.

したがって、このような構成とすれば、第1の実施形態の作用効果に加えて、シール部材本体402と保護カバー305によりシール部材401が弁棒205の往復動と直交する方向にスライド可能に保持されているので、弁棒205が往復動と直交する方向に揺動してもシール部材401の接触部を弁棒205と接触させた状態で弁棒205の動きに追従させることができる。   Therefore, with such a configuration, in addition to the operational effects of the first embodiment, the seal member 401 is held by the seal member main body 402 and the protective cover 305 so as to be slidable in a direction orthogonal to the reciprocating motion of the valve stem 205. Therefore, even if the valve stem 205 swings in a direction orthogonal to the reciprocating motion, the movement of the valve stem 205 can be followed in a state where the contact portion of the seal member 401 is in contact with the valve rod 205.

また、シール部材401は、シール部材本体402と別体になっているので、メンテナンス時にシール部材401を容易に交換することができる。   Further, since the seal member 401 is separated from the seal member main body 402, the seal member 401 can be easily replaced during maintenance.

さらに、シール部材401は、シール部材本体402に取付けられた保護カバー305により保護されているので、第3の実施形態と同様に蒸気弁本体の蒸気入口から蒸気とともに異物が流入しても、シール部材301が異物により破損することを防止できる。   Further, since the seal member 401 is protected by a protective cover 305 attached to the seal member main body 402, even if foreign matter flows in from the steam inlet of the steam valve main body as in the third embodiment, The member 301 can be prevented from being damaged by foreign matter.

(第5の実施形態)
図6は本発明による蒸気弁装置の第5の実施形態における要部を示す断面図で、図1と同一構成部品には同一符号を付してその説明を省略し、ここでは異なる部分について述べる。
(Fifth embodiment)
FIG. 6 is a cross-sectional view showing the main part of a fifth embodiment of the steam valve device according to the present invention. The same components as those in FIG. .

蒸気弁装置においては、弁棒205からの漏洩蒸気を2〜3箇所の図示しないヘッダーに分割して回収する構造がとられている。図6ではその回収構造の1段目を示しており、ポート503は任意ヘッダーに接続されるものである。   The steam valve device has a structure in which the leaked steam from the valve rod 205 is divided into two or three headers (not shown) and collected. FIG. 6 shows the first stage of the collection structure, and the port 503 is connected to an arbitrary header.

第5の実施形態では、このような回収構造を備えた蒸気弁装置において、1段目のブッシュ502とその先に連なるブッシュ201との間に蒸気室側のシール部材301と同様のシール部材501を取付けるものである。   In the fifth embodiment, in the steam valve device having such a recovery structure, a seal member 501 similar to the seal member 301 on the steam chamber side is provided between the first-stage bushing 502 and the bushing 201 connected to the first bushing 502. Is to be installed.

このように弁棒205の往復動方向のブッシュ内部に複数段のシール部材を配置することで、第1の実施形態と同様の作用効果に加えて、さらに大気側への漏洩蒸気を効果的に防止することができる。   In this way, by arranging a plurality of stages of seal members inside the bush in the reciprocating direction of the valve stem 205, in addition to the same effect as the first embodiment, it is possible to effectively prevent the leaked steam to the atmosphere side. Can be prevented.

(第6の実施形態)
図7は本発明による蒸気弁装置の第6の実施形態における要部を示す断面図、図8は図7のX−X線に沿う矢視断面図で、図1と同一構成部品には同一符号を付してその説明を省略し、ここでは異なる部分について述べる。
(Sixth embodiment)
7 is a cross-sectional view showing the main part of a sixth embodiment of the steam valve device according to the present invention, FIG. 8 is a cross-sectional view taken along the line XX of FIG. 7, and the same components as in FIG. The description will be omitted with reference numerals, and different parts will be described here.

第6の実施形態では、図7及び図8に示すように上蓋202の蒸気室側に対応する弁棒205の貫通部分の周囲部に、付き合せ面が互い違いの段差面となるように2分割されたケース310a,310bを内径側に弁棒205との対向面が開口する環状凹部310cが形成されるように組合せて配置され、環状凹部310c内に複数の断面が略三角形状のシール部材片320aを挟み込み且つ全体が環状のシール部材320になるようにそれぞれ挿入した上で、これらケース310a,310bを一体的に上蓋202にボルト302により取付けるようにしたものである。   In the sixth embodiment, as shown in FIG. 7 and FIG. 8, it is divided into two so that the abutting surface is a staggered step surface around the penetrating portion of the valve rod 205 corresponding to the steam chamber side of the upper lid 202. The casings 310a and 310b thus formed are arranged in combination so that an annular recess 310c having an opening facing the valve stem 205 is formed on the inner diameter side, and a plurality of sealing member pieces having a substantially triangular cross section in the annular recess 310c. The cases 310a and 310b are integrally attached to the upper lid 202 with the bolts 302 after being inserted so as to sandwich the 320a and to be an annular seal member 320 as a whole.

この場合、各シール部材片320aは、それ自体がバネになっており、そのバネ力にて各シール部材片320aの先端が弁棒205の外表面に接触して押付けられるように機能している。   In this case, each seal member piece 320a itself is a spring, and functions so that the tip of each seal member piece 320a contacts and is pressed against the outer surface of the valve stem 205 by the spring force. .

また、シール部材片320a自体のバネ力の調整は、2分割されたケース310a,310bの開口幅の寸法Aとシール部材片320aの挟み込み長さ寸法Bの寸法差(締付け寸法)により行われ、2分割されたケース310a,310bの合せ面を調整加工することにより任意の寸法差(締付け寸法)を得ることができるので、弁棒205への押付け力の微調整が可能である。   Further, the adjustment of the spring force of the seal member piece 320a itself is performed by the difference in dimension (tightening dimension) between the opening width dimension A of the two divided cases 310a and 310b and the sandwiching length dimension B of the seal member piece 320a. Since an arbitrary dimensional difference (tightening dimension) can be obtained by adjusting the mating surfaces of the two divided cases 310a and 310b, the pressing force to the valve stem 205 can be finely adjusted.

ここで、シール部材片320aの形状や機能、特徴について述べると次の通りである。   Here, the shape, function, and characteristics of the seal member piece 320a will be described as follows.

(1)ケース310a,310bにより形成された環状凹部310c内に挿入される複数のシール部材片320a全体は、弁棒205に対する径方向断面(すなわち、弁棒205の中心軸を含む断面)が略三角形状の中空部を有する環状のシール部材320を形成しており、環状凹部310c内に挿入される際には、三角形状の頂点に相当する凸部が内周側(すなわち、弁棒205の表面と相対する側)に位置するように配置される。また、この環状のシール部材320の弁棒205に対する外周側は繋がらずに切れた構造となっている。そして、これらの複数のシール部材片320aは、ケース310a,310bにより形成された環状凹部310c内に挿入されることで弁棒205の軸方向に押圧され、内周側に配置された凸部には内周方向(すなわち、弁棒205に対する径方向内側)へのバネ力が作用する。 (1) The whole of the plurality of seal member pieces 320a inserted into the annular recess 310c formed by the cases 310a and 310b has a substantially radial cross section with respect to the valve stem 205 (that is, a cross section including the central axis of the valve stem 205). An annular seal member 320 having a triangular hollow portion is formed. When the annular seal member 320 is inserted into the annular recess 310c, the convex portion corresponding to the triangular apex is formed on the inner peripheral side (that is, the valve stem 205). It is arrange | positioned so that it may be located in the side opposite to the surface. In addition, the outer peripheral side of the annular seal member 320 with respect to the valve rod 205 is not connected and is cut. The plurality of seal member pieces 320a are inserted into the annular recess 310c formed by the cases 310a and 310b, and are pressed in the axial direction of the valve stem 205, and are formed on the protrusions disposed on the inner peripheral side. Spring force acts in the inner circumferential direction (that is, radially inward with respect to the valve stem 205).

シール部材片320aの板の厚みtは、予想される弁棒205表面への酸化スケールの付着量以上の厚みがあれば、弁棒205の往復動の度に酸化スケールを乗り越える際に個別に独立して弾性変形しても、隣り合うシール部材片320aとのシール性を保持することができる。   As long as the thickness t of the plate of the seal member piece 320a is greater than the expected amount of oxide scale adhering to the surface of the valve stem 205, the thickness t of the seal member piece 320a is independent independently when the oxide rod scales over the reciprocating motion of the valve stem 205. Even if elastically deformed, the sealing performance between the adjacent seal member pieces 320a can be maintained.

なお、バネ力確保のためにはシール部材片320aの板の厚みtは均一である必要はなく、任意に設計できる。   In order to secure the spring force, the thickness t of the plate of the seal member piece 320a does not need to be uniform and can be arbitrarily designed.

(2)弁棒205に対する径方向断面が略三角形状のシール部材片320aにおいて、弁棒205の外表面に接する凸形状の頂点部分は、弁棒205の往復動方向に曲面(R1)加工されている。 (2) In the sealing member piece 320a having a substantially triangular cross section in the radial direction with respect to the valve stem 205, a convex apex portion in contact with the outer surface of the valve stem 205 is curved (R1) in the reciprocating direction of the valve stem 205. ing.

なお、弁棒205の外表面に接する部位が凸形状であり、その頂点部分に曲面(R1)加工が施されていれば、シール部材片320aの弁棒205に対する径方向断面の全体形状としては略三角形状の中空環状のものに拘わらず、内周側に凸形状となっていれば丸形や、あるいは台形(四角形)や五角形などの多角形状をした中空環状のものであってもよい。また、本実施形態においてはシール部材片320aの弁棒205に対する外周側は繋がらない形状としているが、これらを繋げた完全中空形状とすることも可能である。   In addition, if the site | part which contact | connects the outer surface of the valve stem 205 is convex shape, and the curved surface (R1) process is given to the vertex part, as the whole shape of the radial direction cross section with respect to the valve stem 205 of the seal member piece 320a, Regardless of the substantially triangular hollow ring shape, it may be round, or a hollow ring shape having a polygonal shape such as a trapezoid (quadrangle) or a pentagon as long as it has a convex shape on the inner peripheral side. Further, in the present embodiment, the outer peripheral side of the seal member piece 320a with respect to the valve rod 205 is not connected, but it is also possible to have a completely hollow shape connecting these.

更に、弁棒205の外表面には、経年的に酸化スケールが付着するが、弁棒205の往復動により酸化スケール部分が通過するときのシール部材320へ噛み込みを防止するために、シール部材320の内面(弁棒との接触面)は凸状の曲面(R1)形状としているので、弁棒205の往復動を阻害(拘束)することはない。   Further, although the oxide scale adheres to the outer surface of the valve stem 205 over time, the seal member is used to prevent the seal member 320 from being caught when the oxide scale portion passes due to the reciprocation of the valve stem 205. Since the inner surface of 320 (the contact surface with the valve stem) has a convex curved surface (R1) shape, the reciprocation of the valve stem 205 is not hindered (restrained).

(3)弁棒205の外表面には経年的に酸化スケールが付着するが、複数のシール部材片320aにより形成された環状のシール部材320は、常時弁棒205に接触しているので、該当する1片または複数片が弁棒205の往復動の度に酸化スケールを乗り越えるように個別に独立して弾性変形することができる。また、変形後はシール部材片320a自体のバネ力により元の状態に戻る。 (3) Although the oxide scale adheres to the outer surface of the valve stem 205 over time, the annular seal member 320 formed by the plurality of seal member pieces 320a is always in contact with the valve stem 205. One piece or a plurality of pieces can be individually and independently elastically deformed so as to get over the oxide scale each time the valve rod 205 reciprocates. Further, after the deformation, the original state is restored by the spring force of the seal member piece 320a itself.

(4)断面が略三角形状のシール部材片320aの残り2箇所の角は、2分割されたケース310a,310bの環状凹部310c内に挟み込まれており、シール部材320自体が弁棒205の往復動の度に酸化スケールを乗り越えるように変形した場合、その動きを妨げないようにシール部材320の周方向に曲面(R2)を施し、自由度を確保している。 (4) The remaining two corners of the seal member piece 320a having a substantially triangular cross section are sandwiched between the annular recesses 310c of the two cases 310a and 310b, and the seal member 320 itself reciprocates the valve stem 205. In the case of deformation so as to get over the oxide scale every time it moves, a curved surface (R2) is applied in the circumferential direction of the seal member 320 so as not to hinder the movement, and the degree of freedom is secured.

(5)略三角形状のシール部材片320aにおいて、弁棒205の外表面に接する部分と反対側の外周側は、繋がらずに切れており、間隙(L)がある。このため、シール部材320の形状変形時の遊び(逃げ)の役目を負っており、間隙寸法は限定せず、設計によってとは2分割されたケース310a,310bの環状凹部310c内に挟み込まれた2箇所の曲面(R2)の近傍まで開口していても機能的には構わない。 (5) In the substantially triangular seal member piece 320a, the outer peripheral side opposite to the portion in contact with the outer surface of the valve stem 205 is disconnected and has a gap (L). For this reason, it plays a role of play (escape) at the time of deformation of the shape of the seal member 320, the gap size is not limited, and it is sandwiched in the annular recess 310c of the case 310a, 310b divided into two depending on the design. Even if it opens to the vicinity of two curved surfaces (R2), it does not matter functionally.

次に略三角形状のシール部材片320aの製作手順について図9により説明する。   Next, the manufacturing procedure of the substantially triangular sealing member piece 320a will be described with reference to FIG.

なお、製作途中にて必要な熱処理工程や後述する盛金工程については公知であるため、ここではその説明を省略する。   In addition, since it is well-known about the heat processing process required in the middle of manufacture and the depositing process mentioned later, the description is abbreviate | omitted here.

(1)図9(a)に示す厚さtの素材の平板を、同図(b)に示すように2分割されたケース310a,310bの環状凹部310cの内面寸法の曲率(R3)で整形する。 (1) A flat plate of a material having a thickness t shown in FIG. 9A is shaped with the curvature (R3) of the inner surface dimension of the annular recess 310c of the case 310a, 310b divided into two as shown in FIG. 9B. To do.

(2)整形したシール部材片320aを、同図(c)に示すように曲率(R3)の付いた方を内側として略三角形状になるように丸めて整形する。 (2) The shaped seal member piece 320a is rounded and shaped so as to be substantially triangular with the curvature (R3) as the inside as shown in FIG.

(3)略三角形状の両端面を、同図(d)に示すようにクサビ型に整形する。 (3) The substantially triangular end faces are shaped into a wedge shape as shown in FIG.

(4)略三角形状の凸形状の頂点部分を、同図(e)に示すように弁棒205の外径寸法(R4)に整形する。 (4) The apex portion of the substantially triangular convex shape is shaped to the outer diameter dimension (R4) of the valve stem 205 as shown in FIG.

この場合、上記(2)とは逆に、曲率(R3)の付いた方を外側にして略三角形状に丸めるように整形することも可能であるが、作用する蒸気差圧に対する強度や弾性変形の容易さから上記(2)の手段が好ましい。   In this case, contrary to the above (2), it is possible to shape it so that it is rounded into a substantially triangular shape with the curvature (R3) on the outside, but the strength and elastic deformation against the acting steam differential pressure The means (2) is preferred because of its ease.

このように製作された複数のシール部材片320a全体は、断面が略三角形状の中空部を有する環状のシール部材320を形成する。   The entire plurality of seal member pieces 320a manufactured in this way forms an annular seal member 320 having a hollow portion having a substantially triangular cross section.

また、前記シール部材片320aの材質は、シール部材320の内径と弁棒205の外径との間隙を変化させないために、弁棒205と膨張係数が等しく、好ましくは弁棒205と同一材質であることが望ましい。   The seal member piece 320a is made of the same material as the valve rod 205, preferably the same material as the valve rod 205, so that the gap between the inner diameter of the seal member 320 and the outer diameter of the valve rod 205 is not changed. It is desirable to be.

ここで、シール部材320より弁棒205の膨張係数が大きい組合せになった場合には、実機運転温度(高温)状態下にてシール部材320が弁棒205の外表面に接触するように構成するため、組立作業時の常温(低温)状態下では膨張係数の差により生じる伸び差の分を、略三角形状のシール部材片320aを環状に整形した後の弁棒205の外形寸法に整形するときに、シール部材320の内径寸法を大きく整形することにより、弁棒205の外径との間隙として確保することができる。このため、組立作業時の常温(低温)状態下では、シール部材320が弁棒205の外表面に接触しないことになるが、材料の組合せの観点からすれば好ましい手段である。   Here, when the combination is such that the expansion coefficient of the valve stem 205 is larger than that of the seal member 320, the seal member 320 is configured to come into contact with the outer surface of the valve rod 205 under the actual machine operating temperature (high temperature) state. Therefore, when the difference in elongation caused by the difference in expansion coefficient under normal temperature (low temperature) state during assembly work is shaped into the outer dimensions of the valve stem 205 after the substantially triangular seal member piece 320a is shaped into an annular shape. In addition, it is possible to secure a gap with the outer diameter of the valve stem 205 by shaping the inner diameter of the seal member 320 to be large. For this reason, the seal member 320 does not come into contact with the outer surface of the valve stem 205 in a normal temperature (low temperature) state during assembly work, but this is a preferable means from the viewpoint of the combination of materials.

更に、シール部材320の内面は、弁棒205の往復動による摩耗防止のために窒化による表面硬化処理、または酸化スケールが付着し難い材質である一般にステライトの商品名にて市販されているコバルト基硬質合金が盛金されている。   Further, the inner surface of the seal member 320 has a cobalt base that is commercially available under the trade name of Stellite, which is a material that is hard to adhere to a surface hardening treatment by nitriding or oxide scale in order to prevent wear due to reciprocation of the valve stem 205. Hard alloy is plated.

また、弁棒205と常時接触状態を保つために、シール部材320の内面へ酸化スケールが付着しないようにシール部材320そのものをコバルト基硬質合金にて製作することも可能である。   Further, in order to maintain a constant contact state with the valve stem 205, the seal member 320 itself can be made of a cobalt-based hard alloy so that oxide scale does not adhere to the inner surface of the seal member 320.

このようにシール部材320の材質や材料の組合せは、材料強度や酸化スケールの付着特性、膨張係数、シール性能等の要求機能から決定されるが、直接高温蒸気に晒されながらシール部材320のバネ力を確保する目的であれば、シール部材320の材料としてニッケル合金鋼(例えばインコネル718など)等が好適である。   As described above, the material and combination of materials of the seal member 320 are determined based on required functions such as material strength, oxide scale adhesion characteristics, expansion coefficient, and seal performance, but the spring of the seal member 320 is directly exposed to high-temperature steam. For the purpose of securing the force, nickel alloy steel (for example, Inconel 718) or the like is suitable as the material of the seal member 320.

このように本発明の第6の実施形態によれば、複数の断面が略三角形状のシール部材片320aを2分割されたケース310a,310bの組合せにより形成される環状凹部310c内に弁棒205の外表面と接触するようにして挟み込み且つ全体が環状のシール部材320になるようにそれぞれ挿入した上で、これらケース310a,310bを一体的に上蓋202にボルト302により取付けるようにしたので、第1の実施形態と同様の作用効果が得られることに加えて、前述した本実施形態独自の作用効果を得ることができる。   As described above, according to the sixth embodiment of the present invention, the valve stem 205 is formed in the annular recess 310c formed by the combination of the cases 310a and 310b obtained by dividing the seal member piece 320a having a substantially triangular cross section into two. Since these cases 310a and 310b are integrally attached to the upper lid 202 with the bolts 302, they are inserted so as to be in contact with the outer surface of each of them and are formed into an annular seal member 320 as a whole. In addition to obtaining the same operational effects as those of the first embodiment, it is possible to obtain the operational effects unique to the present embodiment described above.

(第7の実施形態)
図10は本発明による蒸気弁装置の第6の実施形態における要部を示す断面図で、図7と同一構成部品には同一符号を付してその説明を省略し、ここでは異なる部分について述べる。
(Seventh embodiment)
FIG. 10 is a cross-sectional view showing the main part of the sixth embodiment of the steam valve device according to the present invention. The same components as those in FIG. .

第7の実施形態では、図10に示すように環状のシール部材320を構成する複数のシール部材片320aとして、弁棒205の外表面に接する面の周方向に複数段の凸凹状のラビリンス320bを加工したものである。   In the seventh embodiment, as shown in FIG. 10, as a plurality of seal member pieces 320 a constituting the annular seal member 320, a plurality of uneven labyrinths 320 b in the circumferential direction of the surface in contact with the outer surface of the valve stem 205 are used. Is processed.

ここで、ラビリンスの歯の形状や歯の植え方等種々考案されているため、特に形状については言及しないが、弁棒205の往復動により酸化スケール部分が通過するときのシール部材320への噛み込みを防止するために、図示しないがシール部材320の内面(弁棒との接触面)の両端部は曲面(R1)形状とすることが望ましい。   Here, since various shapes such as the shape of the teeth of the labyrinth and how to plant the teeth are devised, the shape is not particularly mentioned, but the biting to the seal member 320 when the oxidized scale portion passes due to the reciprocation of the valve stem 205 is performed. In order to prevent entrainment, although not shown, it is desirable that both end portions of the inner surface of the seal member 320 (contact surface with the valve stem) have a curved surface (R1) shape.

このように本実施形態では、弁棒205の外表面に接する複数のシール部材片320aの周方向面に複数段の凸凹状のラビリンス320bを加工したので、第7の実施形態の作用効果に加えて、常時運転中の弁棒部分からの漏洩蒸気量をさらに低減することができる。   As described above, in this embodiment, since the plurality of steps of the labyrinth 320b having a plurality of steps are processed on the circumferential surface of the plurality of seal member pieces 320a that are in contact with the outer surface of the valve stem 205, in addition to the effects of the seventh embodiment. Thus, it is possible to further reduce the amount of leaked steam from the valve stem portion during normal operation.

(第8の実施形態)
図11は本発明による蒸気弁装置の第8の実施形態における要部を示す断面図で、図7と同一構成部品には同一符号を付してその説明を省略し、ここでは異なる部分について述べる。
(Eighth embodiment)
FIG. 11 is a cross-sectional view showing a main part of an eighth embodiment of the steam valve device according to the present invention. The same components as those in FIG. .

前述した図7に示す第6の実施形態において、上蓋202を貫通する弁棒205の外径とこの弁棒205の上蓋202の貫通部に設けられたブッシュ201の内径との間隙寸法は大きいため、弁棒205が往復動するときに弁棒205がその軸方向と直交する方向に揺動する可能性がある。   In the above-described sixth embodiment shown in FIG. 7, the gap between the outer diameter of the valve rod 205 penetrating the upper lid 202 and the inner diameter of the bush 201 provided in the penetrating portion of the upper lid 202 of the valve rod 205 is large. When the valve rod 205 reciprocates, the valve rod 205 may swing in a direction orthogonal to the axial direction.

また、シール部材320の内面は、弁棒205と接触するように組立られ、且つ上蓋202に固定された構造となっているため、弁棒205が揺動するとその動きに追従することができない。   Further, since the inner surface of the seal member 320 is assembled so as to be in contact with the valve stem 205 and is fixed to the upper lid 202, the movement of the valve stem 205 cannot follow the movement.

そこで、第8の実施形態では、図11に示すように上蓋202の蒸気室側に対応する弁棒205の貫通部分の周囲部に、有底筒状のボックス330を配置し、このボックス330内に第7の実施形態と同様の構成の2分割されたケース331a,331bを組合せてこれらをボルト332により一体化したケース331を弁棒205の往復動方向と直交する方向にスライド可能に、且つ環状凹部331c内に複数の断面が略三角形状のシール部材片320aを挟み込み且つ全体が環状になるようにそれぞれ挿入して形成したシール部材320が弁棒205の外表面と接するように設けた上で、ボックス330を上蓋202にボルト333により取付けるようにしたものである。   Therefore, in the eighth embodiment, as shown in FIG. 11, a bottomed cylindrical box 330 is disposed around the penetrating portion of the valve rod 205 corresponding to the steam chamber side of the upper lid 202. In addition, the case 331 in which the two divided cases 331a and 331b having the same configuration as that of the seventh embodiment are combined and integrated with the bolt 332 is slidable in a direction orthogonal to the reciprocating direction of the valve stem 205, and A seal member 320 formed by sandwiching a plurality of substantially triangular seal member pieces 320a in an annular recess 331c and inserting them into an annular shape so as to be in contact with the outer surface of the valve stem 205 Thus, the box 330 is attached to the upper lid 202 with a bolt 333.

このような構成とすれば、ボックス330に2分割されたケース331a,331bを組合せてこれらをボルト332により一体化したケース331を弁棒205の往復動方向と直交する方向にスライド可能に保持されているので、弁棒205が往復動と直交する方向に揺動してもケース331の環状凹部331c内に挿入されたシール部材320の接触部を弁棒205と接触させた状態で弁棒205の動きに追従させることができる。   With such a configuration, the case 331 obtained by combining the case 331a and 331b divided into two into the box 330 and integrating them with the bolt 332 is held so as to be slidable in a direction perpendicular to the reciprocating direction of the valve stem 205. Therefore, even if the valve stem 205 swings in a direction orthogonal to the reciprocating motion, the valve stem 205 is in a state where the contact portion of the seal member 320 inserted into the annular recess 331c of the case 331 is in contact with the valve stem 205. Can follow the movement of

(第9の実施形態)
図12は本発明による蒸気弁装置の第9の実施形態におけるシール部材の一部を示す断斜視図であり、他の構成については図7と同様なので、ここではその説明については省略する。
(Ninth embodiment)
FIG. 12 is a cross-sectional perspective view showing a part of the seal member in the ninth embodiment of the steam valve device according to the present invention, and the other configuration is the same as that in FIG.

前述した第6の実施形態では、2分割されたケース331a,331bの内径側に形成された環状凹部331c内に複数の断面が略三角形状のシール部材片320aを挟み込んで全体が環状のシール部材320を構成するようにしたが、本実施形態では図12に示すように断面が略三角形状の環状のシール部材601とし、このシール部材601の図示しない弁棒の外表面に接触する内周側の先端部分に弁棒205に対する放射状の切り込み加工(すなわち、弁棒205に対する径方向への切り込み加工)を周方向に適宜の間隔をあけて施して複数のスリット部602を設けるようにしたものである。   In the sixth embodiment described above, a sealing member piece 320a having a substantially triangular cross section is sandwiched in an annular recess 331c formed on the inner diameter side of the two divided cases 331a and 331b, so that the whole sealing member is annular. 320, in this embodiment, as shown in FIG. 12, an annular seal member 601 having a substantially triangular cross section is used, and the inner peripheral side of the seal member 601 that contacts the outer surface of a valve stem (not shown) A plurality of slit portions 602 are provided by performing radial cutting with respect to the valve stem 205 (that is, radial cutting with respect to the valve rod 205) at appropriate intervals in the circumferential direction at the tip portion of the valve. is there.

この場合、一つの切り込み加工によるスリット幅は、例えばワイヤーカット加工により0.1mm以下とし、さらには当該スリット部602は常時開口した漏洩蒸気の通路となるため、限りなく小さく0.05mm以下が好ましい。   In this case, the slit width by one cutting process is set to 0.1 mm or less by, for example, wire cutting, and further, the slit portion 602 is a leaky steam passage that is always open, and is preferably as small as 0.05 mm or less. .

また、スリット部602の長さや分割数については、シール部材601の強度や漏洩蒸気量(スリット部を通過する蒸気量)に係わる設計要素により定まることから、任意とする。   Further, the length and the number of divisions of the slit portion 602 are arbitrary because they are determined by design factors related to the strength of the seal member 601 and the amount of leaked steam (the amount of steam passing through the slit portion).

このように本実施形態によれば、先端部分に適宜の間隔を存して放射状に切り込み加工を施して複数のスリット部602を設けたシール部材601は、常時弁棒に接触しながらスリット部602の1片毎または該当する複数片がこれら酸化スケールを乗り越えるように弾性変形するため、弁棒の往復動を阻害(拘束)することはない。   As described above, according to the present embodiment, the seal member 601 provided with a plurality of slit portions 602 by radially cutting the tip portion with an appropriate interval is provided with the slit portion 602 while constantly contacting the valve stem. Therefore, the reciprocation of the valve stem is not hindered (restrained) because each piece of the material or the corresponding plural pieces elastically deforms so as to get over these oxide scales.

また、シール部材601は環状の一体型のため、使用中にシール部材の一部が破損しても、シール部材601全体がバラバラに散乱することがないので、より安全である。   Further, since the seal member 601 is an annular integrated type, even if a part of the seal member is broken during use, the entire seal member 601 is not scattered separately, which is safer.

このような構成のシール部材601を用いても、本発明で得られる効果や機能は前述した実施形態と同様である。   Even if the seal member 601 having such a configuration is used, the effects and functions obtained by the present invention are the same as those of the above-described embodiment.

(第10の実施形態)
図13は本発明による蒸気弁装置の第10の実施形態における要部を示す断面図、図14は図13のY−Y線に沿う矢視断面図で、図1と同一構成部品には同一符号を付してその説明を省略し、ここでは異なる部分について述べる。
(Tenth embodiment)
13 is a cross-sectional view showing the main part of a steam valve device according to a tenth embodiment of the present invention. FIG. 14 is a cross-sectional view taken along the line YY in FIG. The description will be omitted with reference numerals, and different parts will be described here.

第10の実施形態では、図13及び図14に示すように上蓋202の蒸気室側に対応する弁棒205の貫通部分の周囲部に、有底筒状のケース340とこのケース340内部にケース上部に設けられるガイド341に支持させながら複数のクサビ型のシール部材片342aを全体が環状のシール部材342になるように、且つ各シール部材片342aの外周側に該シール部材片342aを常に弁棒205の外表面を押付けるためのバネ、例えば皿バネ343を介在させてそれぞれ径方向に並設した上で、ケース340を閉止板344と一体的に上蓋202にボルト345により取付けるようにしたものである。この場合、各シール部材片342aに作用させるバネの反発力は全て同一になるようにする必要がある。   In the tenth embodiment, as shown in FIG. 13 and FIG. 14, a cylindrical case 340 with a bottom and a case inside the case 340 are provided around the penetrating portion of the valve rod 205 corresponding to the steam chamber side of the upper lid 202. A plurality of wedge-shaped seal member pieces 342a are formed into annular seal members 342 while being supported by guides 341 provided at the upper portion, and the seal member pieces 342a are always valved on the outer peripheral side of each seal member piece 342a. A spring for pressing the outer surface of the rod 205, for example, a disc spring 343, is arranged in the radial direction, and the case 340 is attached to the upper lid 202 integrally with the closing plate 344 by bolts 345. Is. In this case, it is necessary to make all the repulsive forces of the springs acting on the seal member pieces 342a the same.

上記各シール部材片342aの外周側に該シール部材片342aを常に弁棒205の外表面を押付けるためのバネとして、例えば皿バネ343を用いたが、板バネ又は圧縮コイルバネでも良く、更なる反発力を得るためにはシール部材片342aに対して複数個のバネを取付けたり、バネの形状によっては複数のシール部材片342aに対して1個のバネを取付けたりすることも可能である。これらのバネ343は高温蒸気に晒されるため、バネ材料としてはニッケル合金鋼(例としてインコネル718など)の高温材料が適している。   For example, a disc spring 343 is used as a spring for pressing the seal member piece 342a against the outer surface of the valve rod 205 on the outer peripheral side of each seal member piece 342a. However, a plate spring or a compression coil spring may be used. In order to obtain a repulsive force, a plurality of springs can be attached to the seal member piece 342a, or a single spring can be attached to the plurality of seal member pieces 342a depending on the shape of the spring. Since these springs 343 are exposed to high-temperature steam, a high-temperature material of nickel alloy steel (for example, Inconel 718) is suitable as the spring material.

なお、バネ343の目的は、各シール部材片342aを常に弁棒205の外表面に押付けるように作用させるためのものであり、例えば図示しないがベローズを用いてそのベローズに任意の圧力を作用させて押付け力を得るようにしても良い。   The purpose of the spring 343 is to cause each seal member piece 342a to always press against the outer surface of the valve stem 205. For example, although not shown, an arbitrary pressure is applied to the bellows using a bellows. It is also possible to obtain a pressing force.

また、上記シール部材342の材質は、シール部材342の内径と弁棒205の外径との間隙を変化させないため、弁棒205と膨張係数が等しく、好ましくは弁棒205と同一材質であることが望ましいが、材料強度や酸化スケールの付着特性から材料の組合せが決定される。   Further, the material of the seal member 342 does not change the gap between the inner diameter of the seal member 342 and the outer diameter of the valve stem 205, so that the expansion coefficient is the same as that of the valve stem 205, and preferably the same material as the valve stem 205. However, the combination of materials is determined from the strength of the material and the adhesion characteristics of the oxide scale.

ここで、シール部材342より弁棒205の膨張係数が大きい組合せになった場合には、実機運転温度(高温)状態下にてシール部材342が弁棒205の外表面に接触するように構成するため、組立作業時の常温(低温)状態下では、膨張係数の差により生じる伸び差の分を、シール部材342の内径と弁棒205の外径との間隙として確保することができる。このため、組立作業時の常温(低温)状態下では、シール部材342が弁棒205の外表面に接触しないことになるが、材料の組合せの観点からすれば好ましいことである。   Here, when the combination is such that the expansion coefficient of the valve stem 205 is larger than that of the seal member 342, the seal member 342 is configured to come into contact with the outer surface of the valve rod 205 under the actual machine operating temperature (high temperature) state. Therefore, under normal temperature (low temperature) conditions during assembly work, the difference in elongation caused by the difference in expansion coefficient can be ensured as a gap between the inner diameter of the seal member 342 and the outer diameter of the valve stem 205. For this reason, the seal member 342 does not come into contact with the outer surface of the valve stem 205 in a normal temperature (low temperature) state during assembly work, which is preferable from the viewpoint of the combination of materials.

更に、シール部材342の内面は、弁棒205の往復動による摩耗防止のために窒化による表面硬化処理、または酸化スケールが付着し難い材質である一般にステライトの商標名にて市販されているコバルト基硬質合金が盛金されている。これに代えて、弁棒205と常時接触状態を保つため、シール部材342の内面へ酸化スケールが付着しないようにシール部材342そのものをコバルト基硬質合金にて製作することも可能である。   Further, the inner surface of the seal member 342 has a cobalt base that is commercially available under the trade name of Stellite, which is a material hard to adhere to a surface hardening treatment by nitriding or oxide scale to prevent wear due to reciprocating movement of the valve stem 205. Hard alloy is plated. Alternatively, the seal member 342 itself can be made of a cobalt-based hard alloy so that the oxide scale does not adhere to the inner surface of the seal member 342 in order to maintain a constant contact state with the valve stem 205.

このように各シール部材片342aに作用させるバネ343の反発力は全て同一であること、また、クサビ型の各シール部材片342aを並設することで全体が環状に保持することができ、各シール部材片342aと弁棒205との間隙は、弁棒205とブッシュ201の間隙よりも狭く、好ましくは弁棒205との間に間隙を持たずシール部材342が常時弁棒205に接触するように構成されている。   In this way, the repulsive forces of the springs 343 applied to the seal member pieces 342a are all the same, and the wedge-shaped seal member pieces 342a can be held in an annular shape by arranging them in parallel. The gap between the seal member piece 342a and the valve stem 205 is narrower than the gap between the valve stem 205 and the bush 201, and preferably there is no gap between the valve stem 205 and the seal member 342 always contacts the valve stem 205. It is configured.

図15は、シール部材片342aとガイド341との組合せ状態を説明するための斜視図を示している。   FIG. 15 is a perspective view for explaining a combined state of the seal member piece 342 a and the guide 341.

図15に示すようにガイド341には、径方向にシール部材片342aの位置決め溝341aとこの位置決め溝341a相互間に摺動抵抗軽減溝341bがそれぞれ設けられている。   As shown in FIG. 15, the guide 341 is provided with a positioning groove 341a of the seal member piece 342a in the radial direction and a sliding resistance reducing groove 341b between the positioning grooves 341a.

この摺動抵抗軽減溝341bは、次のような理由により設けられる。   The sliding resistance reducing groove 341b is provided for the following reason.

すなわち、シール部材342は、蒸気室内に設置されており、シール部材342自体に蒸気圧力が作用することから、常時蒸気漏洩方向に押付け力が発生する。このような力は、シール部材片342aを半径方向に進退(移動)させる障害となる恐れがあるため、シール部材片342a自体の摺動抵抗の軽減を目的に閉止板344のシール部材片342aとの接触面に摺動抵抗軽減用の溝341bが半径方向に加工されている。   That is, the seal member 342 is installed in the steam chamber, and steam pressure acts on the seal member 342 itself, so that a pressing force is always generated in the steam leakage direction. Such a force may cause an obstacle to advance (retreat) the seal member piece 342a in the radial direction. Therefore, for the purpose of reducing the sliding resistance of the seal member piece 342a itself, the sealing member piece 342a of the closing plate 344 A groove 341b for reducing sliding resistance is formed in the radial direction on the contact surface.

また、クサビ状のシール部材片342aはその径方向の内端側が球面状の凸部に形成され、上面には閉止板341の位置決め溝341aに嵌め込まれる凸状のガイド342bが設けられ、さらに、クサビ面(隣り合う面)の中央部分に凹状の陥没部342cを形成して、隣り合う面同士の接触面積を減少させて摺動抵抗の軽減を図るようにしている。この場合、凹状の陥没部342cに代えて両クサビ面間を完全に貫通させた中空部としてもその効果は同じである。   Further, the wedge-shaped sealing member piece 342a is formed with a spherical convex portion on the inner end side in the radial direction, and a convex guide 342b fitted into the positioning groove 341a of the closing plate 341 is provided on the upper surface. A concave depression 342c is formed in the central portion of the wedge surface (adjacent surfaces) to reduce the contact area between the adjacent surfaces so as to reduce the sliding resistance. In this case, the effect is the same even when a hollow portion that completely penetrates between both wedge surfaces is used instead of the recessed portion 342c.

このような嵌め込み構造とすれば、シール部材片342aは半径方向のみに移動が可能となる。すなわち、弁棒205の外表面には経年的に酸化スケールが付着するが、各シール部材片342aは常時バネ力により弁棒205に接触するので、該当する1片または複数片が弁棒205の往復動の度に酸化スケールを乗り越えるように個別に独立して半径方向に進退することができる。   With such a fitting structure, the seal member piece 342a can be moved only in the radial direction. That is, although the oxide scale adheres to the outer surface of the valve stem 205 over time, each seal member piece 342a always contacts the valve stem 205 by a spring force. In each reciprocation, it is possible to advance and retreat in the radial direction independently so as to overcome the oxide scale.

また、シール部材片342aが径方向に進退した場合には、シール部材片342aのクサビ面(隣り合う面)に開口が生じ、その開口部分から蒸気が漏洩することになるが、クサビ形状であることから半径方向の移動量に対してその開口する幅(寸法)はクサビの先端角度(シール部材342の分割数による角度)に依存するため、非常に微小である。開口する幅(寸法)の観点から、言い換えればクサビの先端角度が45度以下となるようにシール部材342の分割数は8以上が好ましい。   Further, when the seal member piece 342a advances and retreats in the radial direction, an opening is formed in the wedge surface (adjacent surface) of the seal member piece 342a, and steam leaks from the opening portion, but the wedge shape is formed. Therefore, the width (dimension) of the opening with respect to the movement amount in the radial direction is very small because it depends on the tip angle of the wedge (the angle depending on the number of divisions of the seal member 342). From the viewpoint of the opening width (dimension), in other words, the number of divisions of the seal member 342 is preferably 8 or more so that the tip angle of the wedge is 45 degrees or less.

更に、弁棒205の往復動により酸化スケール部分が通過するときのシール部材342への噛み込みを防止するために、シール部材342の内面(弁棒との接触面)は凸状の球面形状としているので、弁棒205の往復動を阻害(拘束)することはない。   Further, the inner surface of the seal member 342 (the contact surface with the valve rod) has a convex spherical shape to prevent the seal member 342 from being caught when the oxide scale portion passes due to the reciprocating motion of the valve rod 205. Therefore, the reciprocation of the valve stem 205 is not hindered (restrained).

このように本発明の第10の実施形態によれば、上蓋202の蒸気室側に対応する弁棒205の貫通部分の周囲部に、有底筒状のケース340とこのケース340内部にケース上部に設けられるガイド341に支持させながら複数のクサビ型のシール部材片342aを全体が環状のシール部材342になるように、且つ各シール部材片342aの外周側に該シール部材片342aを常に弁棒205の外表面を押付けるためのバネ、例えば皿バネ343を介在させてそれぞれ径方向に並設した上で、ケース340を閉止板344と一体的に上蓋202にボルト345により取付けるようにしたので、第1の実施形態と同様の作用効果が得られることに加えて、前述した本実施形態独自の作用効果を得ることができる。   As described above, according to the tenth embodiment of the present invention, the bottomed cylindrical case 340 and the case upper portion inside the case 340 are disposed around the through portion of the valve rod 205 corresponding to the steam chamber side of the upper lid 202. A plurality of wedge-shaped seal member pieces 342a are formed into annular seal members 342 while being supported by guides 341 provided on the outer periphery of the seal member pieces 342a, and the seal member pieces 342a are always attached to the valve rods on the outer peripheral side of each seal member piece 342a. Since a spring for pressing the outer surface of 205, for example, a disc spring 343, is arranged in the radial direction, the case 340 is attached to the upper lid 202 integrally with the closing plate 344 by bolts 345. In addition to obtaining the same operational effects as those of the first embodiment, the above-described operational effects unique to the present embodiment can be obtained.

(第11の実施形態)
図16は本発明による蒸気弁装置の第11の実施形態における要部を示す断面図で、図13と同一部分には同一符号を付してその説明を省略し、ここでは異なる点について述べる。
(Eleventh embodiment)
FIG. 16 is a cross-sectional view showing a main part of an eleventh embodiment of the steam valve device according to the present invention. The same parts as those in FIG. 13 are denoted by the same reference numerals and the description thereof is omitted, and different points will be described here.

第11の実施形態では、図16に示すように環状のシール部材342を構成する複数のシール部材片342aとして、弁棒205の外表面に接する面の周方向に複数段の凸凹状のラビリンス342dを加工したものである。   In the eleventh embodiment, as shown in FIG. 16, as a plurality of seal member pieces 342 a constituting the annular seal member 342, a plurality of steps of labyrinths 342 d having a plurality of steps in the circumferential direction of the surface contacting the outer surface of the valve stem 205 Is processed.

ここで、ラビリンスの歯の形状や歯の植え方等種々考案されているため、特に形状については言及しないが、弁棒205の往復動により酸化スケール部分が通過するときのシール部材342への噛み込みを防止するために、図示しないがシール部材342の内面(弁棒との接触面)の両端部は曲面(R1)形状とすることが望ましい。   Here, since various shapes such as the shape of the teeth of the labyrinth and how to plant the teeth are devised, the shape is not particularly mentioned, but the biting to the seal member 342 when the oxidized scale portion passes due to the reciprocation of the valve stem 205 is performed. In order to prevent entrainment, it is desirable that both end portions of the inner surface (the contact surface with the valve stem) of the seal member 342 have a curved surface (R1) shape (not shown).

このように本実施形態では、第10の実施形態と同様の作用効果が得られることに加えて、弁棒205の外表面に接する複数のシール部材片342aの周方向面に複数段の凸凹状のラビリンス342dを加工したので、常時運転中の弁棒部分からの漏洩蒸気量をさらに低減することができる。   As described above, in this embodiment, in addition to the same effects as those of the tenth embodiment, a plurality of steps of unevenness are formed on the circumferential surface of the plurality of seal member pieces 342a that are in contact with the outer surface of the valve stem 205. Since the labyrinth 342d is processed, it is possible to further reduce the amount of leaked steam from the valve stem portion that is always in operation.

(第12の実施形態)
図17は本発明による蒸気弁装置の第12の実施形態における要部を示す断面図で、図13と同一構成部品には同一符号を付してその説明を省略し、ここでは異なる部分について述べる。
(Twelfth embodiment)
FIG. 17 is a cross-sectional view showing a main part of a twelfth embodiment of the steam valve device according to the present invention. The same components as those in FIG. 13 are assigned the same reference numerals and explanations thereof are omitted, and different parts are described here. .

図13に示す第10の実施形態では、上蓋202を貫通する弁棒205の外径とこの弁棒205の上蓋202の貫通部に設けられたブッシュ201の内径との間隙寸法は大きいため、弁棒205が往復動するときに弁棒205がその軸方向と直交する方向に揺動する可能性がある。   In the tenth embodiment shown in FIG. 13, the gap between the outer diameter of the valve stem 205 that penetrates the upper lid 202 and the inner diameter of the bush 201 provided in the penetration portion of the upper lid 202 of the valve stem 205 is large. When the rod 205 reciprocates, the valve rod 205 may swing in a direction orthogonal to its axial direction.

また、シール部材342の内面は、弁棒205と接触するように組立られ、且つ上蓋202に固定された構造となっているため、弁棒205が揺動するとその動きに追従することができない。   In addition, since the inner surface of the seal member 342 is assembled so as to be in contact with the valve stem 205 and is fixed to the upper lid 202, the movement of the valve stem 205 cannot follow.

そこで、第12の実施形態では、図17に示すように上蓋202の蒸気室側に対応する弁棒205の貫通部分の周囲部に、有底筒状のボックス350を配置し、このボックス350内に第10の実施形態と同様にガイド341に支持させながら複数のクサビ型のシール部材片342aを全体が環状のシール部材342になるように、且つ各シール部材片342aの外周側に皿バネ343を介在させてそれぞれ径方向に並設したケース340を弁棒205の往復動方向と直交する方向にスライド可能に設けた上で、ボックス350を閉止板334と一体的に上蓋202にボルト351により取付けるようにしたものである。   Therefore, in the twelfth embodiment, as shown in FIG. 17, a bottomed cylindrical box 350 is disposed around the penetrating portion of the valve rod 205 corresponding to the steam chamber side of the upper lid 202. In the same manner as in the tenth embodiment, the plurality of wedge-shaped seal member pieces 342a are supported by the guide 341 so as to form an annular seal member 342 as a whole, and on the outer peripheral side of each seal member piece 342a, a disc spring 343 is provided. The case 350, which is arranged side by side in the radial direction with the interposition of the valve rod slidably provided in the direction perpendicular to the reciprocating direction of the valve rod 205, is mounted on the upper lid 202 integrally with the closing plate 334 by bolts 351. It is intended to be installed.

このような構成とすれば、ボックス350にケース340を弁棒205の往復動方向と直交する方向にスライド可能に保持されているので、弁棒205が往復動と直交する方向に揺動してもシール部材342の接触部を弁棒205と接触させた状態で弁棒205の動きに追従させることができる。   With such a configuration, the case 340 is held in the box 350 so as to be slidable in a direction perpendicular to the reciprocating direction of the valve stem 205, so that the valve stem 205 swings in a direction perpendicular to the reciprocating motion. In addition, the movement of the valve stem 205 can be followed in a state where the contact portion of the seal member 342 is in contact with the valve stem 205.

このような構成としても、本発明で得られる効果や機能は前述した実施形態と同様である。   Even with such a configuration, the effects and functions obtained by the present invention are the same as those of the above-described embodiment.

(a),(b)は本発明による蒸気弁装置の第1の実施形態における要部を示し、(a)は断面図、(b)は(a)に示すシール部材のスリット部分の一部と弁棒をA矢方向から見た図。(A), (b) shows the principal part in 1st Embodiment of the steam valve apparatus by this invention, (a) is sectional drawing, (b) is a part of slit part of the sealing member shown to (a). And the valve stem viewed from the direction of the arrow A. 図1におけるシール部材の半部を拡大して示す斜視図。The perspective view which expands and shows the half part of the sealing member in FIG. 本発明による蒸気弁装置の第2の実施形態における要部を示す断面図。Sectional drawing which shows the principal part in 2nd Embodiment of the steam valve apparatus by this invention. 本発明による蒸気弁装置の第3の実施形態における要部を示す断面図。Sectional drawing which shows the principal part in 3rd Embodiment of the steam valve apparatus by this invention. 本発明による蒸気弁装置の第4の実施形態における要部を示す断面図。Sectional drawing which shows the principal part in 4th Embodiment of the steam valve apparatus by this invention. 本発明による蒸気弁装置の第5の実施形態における要部を示す断面図。Sectional drawing which shows the principal part in 5th Embodiment of the steam valve apparatus by this invention. 本発明による蒸気弁装置の第6の実施形態における要部を示す断面図。Sectional drawing which shows the principal part in 6th Embodiment of the steam valve apparatus by this invention. 図8は図7のX−X線に沿う矢視断面図。8 is a cross-sectional view taken along line XX in FIG. (a)〜(e)は同実施形態において、略三角形状のシール部材片の製作手順を説明するための図。(A)-(e) is a figure for demonstrating the manufacture procedure of the substantially triangular-shaped sealing member piece in the embodiment. 本発明による蒸気弁装置の第6の実施形態における要部を示す断面図。Sectional drawing which shows the principal part in 6th Embodiment of the steam valve apparatus by this invention. 本発明による蒸気弁装置の第8の実施形態における要部を示す断面図。Sectional drawing which shows the principal part in 8th Embodiment of the steam valve apparatus by this invention. 本発明による蒸気弁装置の第9の実施形態におけるシール部材の一部を示す断斜視図。The cutaway perspective view which shows a part of seal member in 9th Embodiment of the steam valve apparatus by this invention. 本発明による蒸気弁装置の第10の実施形態における要部を示す断面図。Sectional drawing which shows the principal part in 10th Embodiment of the steam valve apparatus by this invention. 図13のY−Y線に沿う矢視断面図。FIG. 14 is a cross-sectional view taken along line YY in FIG. 13. 同実施形態において、シール部材片とガイドとの組合せ状態を説明するための斜視図本発明の…示す図。The perspective view for demonstrating the combined state of a sealing member piece and a guide in the embodiment, The figure which shows this invention. 本発明による蒸気弁装置の第11の実施形態における要部を示す断面図。Sectional drawing which shows the principal part in 11th Embodiment of the steam valve apparatus by this invention. 本発明による蒸気弁装置の第12の実施形態における要部を示す断面図。Sectional drawing which shows the principal part in 12th Embodiment of the steam valve apparatus by this invention. 従来の蒸気タービンに使用されている蒸気加減弁構造を示す断面図。Sectional drawing which shows the steam control valve structure currently used for the conventional steam turbine. 蒸気タービンを備えた発電設備の構成例を示す系統図。The system diagram which shows the structural example of the power generation equipment provided with the steam turbine.

200…蒸気弁本体、201,502…ブッシュ、202…上蓋、203…弁座、204…弁体、205…弁棒、206…油圧駆動機構、301,401,501…シール部材、302…ボルト、303…スリット部、304,304a,304b…内周部(接触部)、305…保護カバー、310a,310b…ケース、320…シール部材、320a…シール部材片、320b…凹凸状のラビリンス、402…シール部材本体、310c,402a…環状凹部、503…ポート、330…ボックス、331a,331b…2分割ケース、331…ケース、331c…環状凹部、340…ケース、341…ガイド、341a…位置決め溝、342…シール部材、342a…シール部材片、342b…凸状のガイド、342c…陥没部、342d…凸凹状のラビリンス、343…皿バネ、344…閉止板、345…ボルト、350…ボックス、351…ボルト、601…シール部材、602…スリット部、   200 ... Steam valve main body, 201, 502 ... Bush, 202 ... Upper lid, 203 ... Valve seat, 204 ... Valve body, 205 ... Valve rod, 206 ... Hydraulic drive mechanism, 301, 401, 501 ... Seal member, 302 ... Bolt, 303: Slit portion, 304, 304a, 304b ... Inner peripheral portion (contact portion), 305 ... Protective cover, 310a, 310b ... Case, 320 ... Seal member, 320a ... Seal member piece, 320b ... Uneven labyrinth, 402 ... Seal member body, 310c, 402a ... annular recess, 503 ... port, 330 ... box, 331a, 331b ... split case, 331 ... case, 331c ... annular recess, 340 ... case, 341 ... guide, 341a ... positioning groove, 342 ... sealing member, 342a ... sealing member piece, 342b ... convex guide, 342c ... depression, 34 d ... uneven labyrinth, 343 ... disc spring, 344 ... closure plate, 345 ... bolts, 350 ... box, 351 ... bolts, 601 ... sealing member, 602 ... slits,

Claims (15)

蒸気入口部及び蒸気出口部を有する蒸気弁本体と、この蒸気弁本体の上面開口部を閉塞する上蓋と、この上蓋の大気側から前記蒸気弁本体内の蒸気室に貫通させて設けられ先端部に有する弁体により前記蒸気出口部より流出する蒸気流量を制御する弁棒と、この弁棒が貫通する前記上蓋の貫通穴に前記弁棒が軸方向に往復動するに適正な間隙を存するように設けられたブッシュとを備えた蒸気弁装置において、
前記上蓋の蒸気室側に貫通する弁棒の周囲に、前記弁棒の外表面に接触するように配置された環状のシール部材を備え
前記環状のシール部材は、前記弁棒との接触部に前記弁棒に対する径方向に複数本のスリットが設けられて複数個のシール部材片に分割され、前記シール部材片の端部が球面形状であり、この端部の球面部分が往復動する前記弁棒に突き当たって接触することを特徴とする蒸気弁装置。
A steam valve body having a steam inlet portion and a steam outlet portion, an upper lid that closes an upper surface opening of the steam valve body, and a tip portion provided so as to penetrate from the atmosphere side of the upper lid to the steam chamber in the steam valve body A valve rod for controlling the flow rate of the steam flowing out from the steam outlet by the valve body provided in the valve body, and an appropriate gap for the valve rod to reciprocate in the axial direction in the through hole of the upper lid through which the valve rod passes. In the steam valve device provided with the bush provided in
Around the valve stem through the steam chamber side of the upper lid, with the placed annular seal member so as to contact with the outer surface of the valve stem,
The annular seal member is divided into a plurality of seal member pieces by providing a plurality of slits in a radial direction with respect to the valve stem at a contact portion with the valve stem, and an end portion of the seal member piece is spherical. And the spherical portion of the end portion abuts against and contacts the reciprocating valve stem .
請求項1記載の蒸気弁装置において、
前記環状のシール部材は、前記弁棒の軸方向に複数段設けられてなることを特徴とする蒸気弁装置。
The steam valve device according to claim 1,
The annular seal member is provided in a plurality of stages in the axial direction of the valve rod.
請求項1乃至請求項の何れかに記載の蒸気弁装置において、
前記シール部材の外側に前記ブッシュの内径より内径が大きく設定された保護カバーを配置したことを特徴とする蒸気弁装置。
The steam valve device according to any one of claims 1 to 2 ,
A steam valve device, wherein a protective cover having an inner diameter larger than an inner diameter of the bush is disposed outside the seal member.
請求項1記載の蒸気弁装置において、
前記環状のシール部材は、前記弁棒に対する径方向断面が内周側に凸部を有する中空形状であり、前記弁棒の軸方向に押圧されて内周方向へのバネ力が作用するように構成されたことを特徴とする蒸気弁装置。
The steam valve device according to claim 1,
The annular seal member has a hollow shape in which a radial cross section with respect to the valve stem has a convex portion on the inner peripheral side, and is pressed in the axial direction of the valve stem so that a spring force acts in the inner peripheral direction. A steam valve device characterized by being configured.
請求項記載の蒸気弁装置において、
前記環状のシール部材は、前記弁棒の外表面に接する部分と反対側の外周側が繋がらずに切れており、それら切り口の端面は軸方向側に間隙を有していることを特徴とする蒸気弁装置。
The steam valve device according to claim 4 ,
The annular seal member is cut without the outer peripheral side opposite to the portion in contact with the outer surface of the valve stem being connected, and the end surfaces of the cut ends have a gap on the axial side. Valve device.
請求項又は請求項の何れかに記載の蒸気弁装置において、
前記環状のシール部材は、複数のシール部材片が周方向に配置されてなることを特徴とする蒸気弁装置。
The steam valve device according to any one of claims 4 and 5 ,
The annular seal member is a steam valve device in which a plurality of seal member pieces are arranged in the circumferential direction.
請求項又は請求項の何れかに記載の蒸気弁装置において、
前記環状のシール部材の前記弁棒に対する内周部には、前記弁棒に対する径方向への切り込み加工によるスリット部が複数設けられていることを特徴とする蒸気弁装置。
The steam valve device according to any one of claims 4 and 5 ,
The steam valve device according to claim 1, wherein a plurality of slit portions are formed in an inner peripheral portion of the annular seal member with respect to the valve rod by a cutting process in a radial direction with respect to the valve rod.
請求項1記載の蒸気弁装置において、
前記環状のシール部材は、複数個のクサビ状のシール部材片を環状になるように配置され、且つ各シール部材片外周側にバネを設け、そのバネ力にて前記各シール部材片内周部が前記弁棒の外表面に接触して押付けられるように構成されたことを特徴とする蒸気弁装置。
The steam valve device according to claim 1,
It said annular seal member, a plurality of wedge shaped sealing piece are arranged so that they form a ring, and a spring provided on the outer peripheral side of the seal piece, of the respective sealing piece by the spring force A steam valve device characterized in that a circumferential portion is configured to be pressed against an outer surface of the valve rod.
請求項記載の蒸気弁装置において、
前記各シール部材片は、その隣り合うもの同士の接触面となる部分の中央部を凹状又は中空にすると共に、半径方向の移動を許容するガイドを有し、
且つ前記シール部材片のガイドが挿入されるガイド用溝を有する閉止板を設け、この閉止板に前記シール部材片との摺動抵抗を低減するための溝を設けたことを特徴とする蒸気弁装置。
The steam valve device according to claim 8 ,
Each of the sealing member pieces has a concave portion or a hollow center portion of a portion that becomes a contact surface between adjacent ones, and has a guide that allows movement in the radial direction,
And a sealing plate having a guide groove into which a guide of the seal member piece is inserted, and a groove for reducing sliding resistance with the seal member piece is provided on the closing plate. apparatus.
請求項1乃至請求項の何れかに記載の蒸気弁装置において、
前記シール部材の前記弁棒の外表面に接する内周部には、表面硬化処理もしくはコバルト基硬質合金が盛金されていることを特徴とする蒸気弁装置。
The steam valve device according to any one of claims 1 to 9 ,
A steam valve device, wherein a surface hardening treatment or a cobalt-based hard alloy is plated on an inner peripheral portion of the seal member that contacts an outer surface of the valve stem.
請求項1乃至請求項の何れかに記載の蒸気弁装置において、
前記シール部材は、コバルト基硬質合金にて盛金によらずに一体的に製作されてなることを特徴とする蒸気弁装置。
The steam valve device according to any one of claims 1 to 9 ,
The said sealing member is integrally manufactured by the cobalt base hard alloy without depending on metal plating, The steam valve apparatus characterized by the above-mentioned.
請求項1乃至請求項10の何れかに記載の蒸気弁装置において、
前記シール部材の材質は、その膨張係数が前記弁棒と等しいことを特徴とする蒸気弁装置。
The steam valve device according to any one of claims 1 to 10 ,
The steam valve device, wherein the material of the seal member has an expansion coefficient equal to that of the valve stem.
請求項乃至請求項10の何れかに記載の蒸気弁装置において、
前記シール部材に設けられたバネは、ニッケル合金鋼からなることを特徴とする蒸気弁装置。
The steam valve device according to any one of claims 8 to 10 ,
The steam valve device, wherein the spring provided on the seal member is made of nickel alloy steel.
請求項乃至請求項の何れかに記載の蒸気弁装置において、
前記環状のシール部材を構成する複数のシール部材片は、前記弁棒の外表面に接触する面に少なくとも1段の凸凹状のラビリンスが周方向に加工されていることを特徴とする蒸気弁装置。
The steam valve device according to any one of claims 4 to 9 ,
The plurality of seal member pieces constituting the annular seal member are characterized in that at least one uneven labyrinth is processed in the circumferential direction on a surface contacting the outer surface of the valve stem. .
前記請求項1乃至請求項14に記載の蒸気弁装置の何れかを備えたことを特徴とする発電設備。 A power generation facility comprising any of the steam valve devices according to any one of claims 1 to 14 .
JP2009002768A 2009-01-08 2009-01-08 Steam valve device and power generation equipment provided with the same Expired - Fee Related JP5221398B2 (en)

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