JP4704621B2

JP4704621B2 - Disc type steam trap

Info

Publication number: JP4704621B2
Application number: JP2001213897A
Authority: JP
Inventors: 武志横山
Original assignee: Tlv Co Ltd
Current assignee: Tlv Co Ltd
Priority date: 2001-07-13
Filing date: 2001-07-13
Publication date: 2011-06-15
Anticipated expiration: 2021-07-13
Also published as: JP2003028389A

Description

【０００１】
【発明の属する技術分野】
本発明は、変圧室すなわち熱力学的蒸気室の圧力変化に応じて開閉動作を行う弁ディスクを用いて、各種蒸気使用機器や蒸気配管で発生する復水を自動的に排出するディスク式スチームトラップに関し、特に高温高圧の蒸気系（一般にスチームトラップにおいては１６ｋｇ／ｃｍ２、２２０°Ｃ以上）に使用するものに関する。
【０００２】
ディスク式スチームトラップの基本的構成は、入口と出口を有する本体に蓋体を固着して内部に変圧室を形成し、変圧室の中心に開口する噴出孔を設けて入口と変圧室を連通し、噴出孔の外周囲に開口する環状溝を設けて、噴出孔と環状溝の間に内輪弁座を形成すると共に、環状溝の外周囲に内輪弁座と同一平面の外輪弁座を形成し、環状溝から排出孔を設けて変圧室と出口を連通し、内輪弁座と外輪弁座に離着座する円板状の弁ディスクを変圧室に配置したものであり、弁ディスクを変圧室の圧力変化によって自力式に制御して内輪弁座と外輪弁座に離着座させ、復水を自動的に排出するものである。このディスク式スチームトラップを高温高圧の蒸気系に使用すると、弁ディスクと内輪弁座の間に僅かな隙間を生じ、蒸気を漏洩してしまう問題があった。これは、閉弁時に弁ディスクの下面中央には高温高圧の入口側圧力が作用し、弁ディスクの上面には変圧室の圧力が作用するために、弁ディスクが上に凸状に湾曲し、外輪弁座には密着しているが内輪弁座との間に僅かな隙間を生じるためである。
【０００３】
【従来の技術】
そこで、従来は特公昭４８−１５３４２号公報に示されているような技術が用いられていた。これは、弁ディスク下面の中心部を外周部よりも下方に僅かに突出させて形成することにより、閉弁時に弁ディスクが上に凸状に湾曲しても、弁ディスクが内輪弁座と外輪弁座に密着できるものである。
【０００４】
【発明が解決しようとする課題】
上記従来のディスク式スチームトラップにおいては、閉弁直後は弁ディスクと内輪弁座及び外輪弁座との密着を維持できるが、変圧室の圧力低下に伴って外輪弁座と弁ディスクとの間に僅かな隙間を生じるために、変圧室の流体が出口に排出され、比較的早期に開弁してしまう問題があった。これは、変圧室の圧力低下に伴って弁ディスクの湾曲度合が小さくなるために、弁ディスクが内輪弁座には密着しているが外輪弁座との間に僅かな隙間を生じるためである。従って、本発明の技術的課題は、弁ディスクが早期に開弁しないディスク式スチームトラップを提供することである。
【０００５】
【課題を解決するための手段】
上記の技術的課題を解決するために講じた本発明の技術的手段は、入口と出口を有する本体に蓋体を固着して内部に変圧室を形成し、変圧室の中心に開口する噴出孔を設けて入口と変圧室を連通し、噴出孔の外周囲に開口する環状溝を設けて、噴出孔と環状溝の間に内輪弁座を形成すると共に、環状溝の外周囲に内輪弁座と同一平面の外輪弁座を形成し、環状溝から排出孔を設けて変圧室と出口を連通し、内輪弁座と外輪弁座に離着座する円板状の弁ディスクを変圧室に配置したものにおいて、噴出孔の変圧室側端を大径に形成し大径部に噴出孔の外周壁を摺動する内輪シールリングを配置し、弁ディスクの開弁時に内輪シールリングの上端を内輪弁座と外輪弁座よりも僅かに突出させる弾性部材としてのバネを、大径部の底壁と内輪シールリングの下面との間に設け、環状溝に環状溝の外周壁を摺動する外輪シールリングを配置し、弁ディスクの開弁時に外輪シールリングの上端を内輪弁座と外輪弁座よりも僅かに突出させる弾性部材としてのバネを、環状溝の底壁と外輪シールリングの下面との間に設けたものである。
【０００６】
【発明の実施の形態】
本発明は、噴出孔の変圧室側端を大径に形成し大径部に噴出孔の外周壁を摺動する内輪シールリングを配置し、弁ディスクの開弁時に内輪シールリングの上端を内輪弁座と外輪弁座よりも僅かに突出させる弾性部材としてのバネを、大径部の底壁と内輪シールリングの下面との間に設け、環状溝に環状溝の外周壁を摺動する外輪シールリングを配置し、弁ディスクの開弁時に外輪シールリングの上端を内輪弁座と外輪弁座よりも僅かに突出させる弾性部材としてのバネを、環状溝の底壁と外輪シールリングの下面との間に設けたものである。そのため、閉弁直後は弁ディスクが外輪弁座と内輪シールリングに密着している。変圧室の圧力低下によって弁ディスクの湾曲度合が小さくなると、弁ディスクと外輪弁座との間に僅かな隙間を生じるが、外輪シールリングが弁ディスクとの密着を維持する。そして、変圧室の圧力が所定の開弁圧力に低下してから弁ディスクが内輪シールリングと外輪シールリングから離座して開弁する。
【０００７】
【実施例】
上記の技術的手段の具体例を示す実施例を説明する（図１参照）。
本体１に蓋体２をねじ結合して内部に変圧室３を形成する。本体１に入口４と出口５をほぼ同一軸上に形成する。本体１に変圧室３の中心に開口する噴出孔６を開け、噴出孔６を介して入口４と変圧室３を連通する。噴出孔６の外周囲に環状溝８を設けて、噴出孔６と環状溝８の間に環状の内輪弁座９を形成し、環状溝８の外周囲に内輪弁座９と同心円状で同一平面の環状の外輪弁座１０を形成する。環状溝８の終端を排出孔７を介して出口５に連通する。内輪弁座９と外輪弁座１０に離着座して開閉弁を行う円板状の弁ディスク１１を変圧室３内に自由状態で配置する。
【０００８】
噴出孔６の変圧室３側端を少し大径に形成し、大径部に噴出孔６の外周壁を摺動する内輪シールリング１２を配置し、大径部の底壁と内輪シールリング１２の下面との間に、弁ディスク１１の開弁時に内輪シールリング１２の上端を内輪弁座９と外輪弁座１０よりも僅かに突出させる弾性部材としてのリング状の波形バネ１３を配置する。環状溝８に環状溝８の外周壁を摺動する外輪シールリング１４を配置し、環状溝８の底壁と外輪シールリング１４の下面との間に、弁ディスク１１の開弁時に外輪シールリング１４の上端を内輪弁座９と外輪弁座１０よりも僅かに突出させる弾性部材としてのリング状の波形バネ１５を配置する。
【０００９】
次に作用を説明する。変圧室３内に蒸気が滞留していない場合、噴出孔６を介して弁ディスク１１に作用する入口４側の流体圧力により、弁ディスク１１は内外輪弁座９，１０から離座して低温復水を環状溝８と排出孔７を介して出口５へ排出する。
【００１０】
復水が排出されて変圧室３内に蒸気が流入してくると、変圧室３内の圧力が上昇すると共に、弁ディスク１１下面を高速の蒸気が流下して静圧低下を来たすことによって、弁ディスク１１は波形バネ１３の付勢力に抗して外輪弁座１０と内輪シールリング１２に着座して閉弁する。
【００１１】
変圧室３内の蒸気が放熱等により凝縮しその蒸気圧力が低下してくると、弁ディスク１１は湾曲度合が小さくなり外輪弁座１０との間に僅かな隙間を生じるが、外輪シールリング１４が弁ディスク１１との密着を維持する。そして、変圧室３の圧力が所定の開弁圧力に低下してから弁ディスク１１が内輪シールリング１２と外輪シールリング１４から離座して開弁する。以上のような開閉弁のサイクルを繰り返す。
【００１２】
【発明の効果】
上記のように本発明によれば、変圧室の圧力が所定の開弁圧力に低下するまでは弁ディスクが内輪シールリングと外輪シールリングに密着しているので、早期に開弁することを防止できる。そのため、頻繁な開閉弁を防止でき寿命を長くすることができるという優れた効果を生じる。
【図面の簡単な説明】
【図１】本発明のディスク式スチームトラップの実施例の断面図である。
【符号の説明】
１本体
２蓋体
３変圧室
４入口
５出口
６噴出孔
７排出孔
８環状溝
９内輪弁座
１０外輪弁座
１１弁ディスク
１２内輪シールリング
１３波形バネ
１４外輪シールリング
１５波形バネ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disk-type steam trap that automatically discharges condensate generated in various steam-using devices and steam pipes by using a valve disk that opens and closes in response to a pressure change in a variable pressure chamber, that is, a thermodynamic steam chamber. In particular, the present invention relates to a high temperature and high pressure steam system (generally 16 kg / cm 2 in a steam trap, 220 ° C. or more).
[0002]
The basic configuration of the disc type steam trap is that a lid is fixed to a main body having an inlet and an outlet to form a variable pressure chamber inside, and an outlet hole is formed in the center of the variable pressure chamber so that the inlet and the variable pressure chamber communicate with each other. An annular groove that opens to the outer periphery of the ejection hole is provided, an inner ring valve seat is formed between the ejection hole and the annular groove, and an outer ring valve seat that is flush with the inner ring valve seat is formed on the outer periphery of the annular groove. , A discharge hole is provided in the annular groove, the transformation chamber communicates with the outlet, and a disk-shaped valve disk that is attached to and detached from the inner ring valve seat and the outer ring valve seat is disposed in the transformation chamber. It is controlled in a self-powered manner by pressure change and is seated on the inner ring valve seat and the outer ring valve seat to automatically discharge the condensate. When this disk-type steam trap is used in a high-temperature and high-pressure steam system, there is a problem that a slight gap is formed between the valve disk and the inner ring valve seat, and the steam leaks. This is because when the valve is closed, a high-temperature and high-pressure inlet-side pressure acts at the center of the bottom surface of the valve disk, and the pressure of the variable pressure chamber acts on the top surface of the valve disk, so that the valve disk curves upwardly, This is because a slight gap is formed between the outer ring valve seat and the inner ring valve seat.
[0003]
[Prior art]
Therefore, conventionally, a technique as disclosed in Japanese Patent Publication No. 48-15342 has been used. This is because the central part of the lower surface of the valve disk is formed so as to protrude slightly below the outer peripheral part, so that even when the valve disk curves upwardly when the valve is closed, the valve disk is It can be in close contact with the valve seat.
[0004]
[Problems to be solved by the invention]
In the conventional disc type steam trap, the valve disc can be kept in close contact with the inner ring valve seat and the outer ring valve seat immediately after the valve is closed, but the pressure between the outer ring valve seat and the valve disc is reduced as the pressure in the variable pressure chamber decreases. Since a slight gap is generated, there is a problem that the fluid in the variable pressure chamber is discharged to the outlet and the valve is opened relatively early. This is because the degree of curvature of the valve disk decreases as the pressure in the variable pressure chamber decreases, and the valve disk is in close contact with the inner ring valve seat, but a slight gap is formed between the valve disk and the outer ring valve seat. . Therefore, the technical problem of the present invention is to provide a disc type steam trap in which the valve disc does not open early.
[0005]
[Means for Solving the Problems]
The technical means of the present invention devised to solve the above technical problem is that a lid is fixed to a main body having an inlet and an outlet to form a variable pressure chamber therein, and an ejection hole that opens at the center of the variable pressure chamber An annular groove that opens to the outer periphery of the ejection hole is provided to communicate the inlet and the variable pressure chamber, and an inner ring valve seat is formed between the ejection hole and the annular groove. The outer ring valve seat is formed in the same plane as the outer ring, a discharge hole is provided through the annular groove, the variable pressure chamber communicates with the outlet, and a disc-shaped valve disk that is attached to and detached from the inner ring valve seat and the outer ring valve seat is disposed in the variable pressure chamber. The inner ring seal ring that slides the outer peripheral wall of the injection hole is arranged in the large diameter part, and the upper end of the inner ring seal ring is connected to the inner ring valve when the valve disk is opened. a spring as an elastic member for slightly protruded than the bearing and the outer ring valve seat, the large diameter portion bottom wall and the inner ring seal Provided between the lower surface of the ring, arranged outer seal ring which slides the outer peripheral wall of the annular groove in the annular groove, slightly than the inner valve seat the upper end of the outer ring seal ring during opening of the valve disc and the outer ring valve seat A spring as an elastic member to be protruded between the bottom wall of the annular groove and the lower surface of the outer ring seal ring is provided.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, an inner ring seal ring that slides on the outer peripheral wall of the injection hole is disposed in the large diameter portion, and the upper end of the inner ring seal ring is disposed on the inner ring when the valve disk is opened. A spring as an elastic member that protrudes slightly from the valve seat and the outer ring valve seat is provided between the bottom wall of the large diameter portion and the lower surface of the inner ring seal ring, and the outer ring slides on the outer circumferential wall of the annular groove in the annular groove. A spring as an elastic member is disposed, and the upper end of the outer ring seal ring protrudes slightly from the inner ring valve seat and the outer ring valve seat when the valve disk is opened, and the bottom wall of the annular groove and the lower surface of the outer ring seal ring Between the two. Therefore, immediately after the valve is closed, the valve disk is in close contact with the outer ring valve seat and the inner ring seal ring. When the degree of curvature of the valve disk decreases due to the pressure drop in the variable pressure chamber, a slight gap is formed between the valve disk and the outer ring valve seat, but the outer ring seal ring maintains close contact with the valve disk. Then, after the pressure in the variable pressure chamber is reduced to a predetermined valve opening pressure, the valve disc is separated from the inner ring seal ring and the outer ring seal ring and opened.
[0007]
【Example】
An embodiment showing a specific example of the above technical means will be described (see FIG. 1).
A lid 2 is screwed to the main body 1 to form a variable pressure chamber 3 therein. An inlet 4 and an outlet 5 are formed on the main body 1 on substantially the same axis. The main body 1 is provided with a jet hole 6 that opens at the center of the variable pressure chamber 3, and the inlet 4 and the variable pressure chamber 3 are communicated with each other through the jet hole 6. An annular groove 8 is provided around the outer periphery of the ejection hole 6, an annular inner ring valve seat 9 is formed between the ejection hole 6 and the annular groove 8, and the inner ring valve seat 9 is concentrically identical to the outer periphery of the annular groove 8. A planar annular outer ring valve seat 10 is formed. The end of the annular groove 8 communicates with the outlet 5 through the discharge hole 7. A disc-shaped valve disk 11 that opens and closes to the inner ring valve seat 9 and the outer ring valve seat 10 to open and close is disposed in the variable pressure chamber 3 in a free state.
[0008]
The end of the ejection hole 6 on the side of the variable pressure chamber 3 is formed to have a slightly larger diameter, and an inner ring seal ring 12 that slides on the outer peripheral wall of the ejection hole 6 is disposed on the large diameter part. A ring-shaped wave spring 13 as an elastic member is disposed between the lower surface of the inner ring seal ring 12 so as to slightly protrude from the inner ring valve seat 9 and the outer ring valve seat 10 when the valve disk 11 is opened. An outer ring seal ring 14 that slides on the outer peripheral wall of the annular groove 8 is disposed in the annular groove 8, and the outer ring seal ring is opened between the bottom wall of the annular groove 8 and the lower surface of the outer ring seal ring 14 when the valve disk 11 is opened. A ring-shaped wave spring 15 is disposed as an elastic member for slightly projecting the upper end of 14 from the inner ring valve seat 9 and the outer ring valve seat 10.
[0009]
Next, the operation will be described. When steam does not stay in the variable pressure chamber 3, the valve disk 11 is separated from the inner and outer ring valve seats 9 and 10 due to the fluid pressure on the inlet 4 side acting on the valve disk 11 through the ejection holes 6, and the temperature is low. Condensate is discharged to the outlet 5 through the annular groove 8 and the discharge hole 7.
[0010]
When the condensate is discharged and steam flows into the variable pressure chamber 3, the pressure in the variable pressure chamber 3 rises, and high-speed steam flows down the bottom surface of the valve disk 11 to reduce the static pressure. The valve disk 11 is seated on the outer ring valve seat 10 and the inner ring seal ring 12 against the biasing force of the wave spring 13 and is closed.
[0011]
When steam in the variable pressure chamber 3 condenses due to heat dissipation and the steam pressure decreases, the degree of curvature of the valve disk 11 decreases and a slight gap is formed between the valve disk 11 and the outer ring seal ring 14. Maintains close contact with the valve disk 11. Then, after the pressure in the variable pressure chamber 3 is lowered to a predetermined valve opening pressure, the valve disk 11 is separated from the inner ring seal ring 12 and the outer ring seal ring 14 and is opened. The above open / close valve cycle is repeated.
[0012]
【The invention's effect】
As described above, according to the present invention, the valve disc is in close contact with the inner ring seal ring and the outer ring seal ring until the pressure in the variable pressure chamber drops to a predetermined valve opening pressure, so that it is prevented from opening early. it can. Therefore, an excellent effect is obtained that frequent open / close valves can be prevented and the life can be extended.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an embodiment of a disc type steam trap of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 3 Transformer chamber 4 Inlet 5 Outlet 6 Ejection hole 7 Discharge hole 8 Annular groove 9 Inner ring valve seat 10 Outer ring valve seat 11 Valve disk 12 Inner ring seal ring 13 Wave spring 14 Outer ring seal ring 15 Wave spring

Claims

入口と出口を有する本体に蓋体を固着して内部に変圧室を形成し、変圧室の中心に開口する噴出孔を設けて入口と変圧室を連通し、噴出孔の外周囲に開口する環状溝を設けて、噴出孔と環状溝の間に内輪弁座を形成すると共に、環状溝の外周囲に内輪弁座と同一平面の外輪弁座を形成し、環状溝から排出孔を設けて変圧室と出口を連通し、内輪弁座と外輪弁座に離着座する円板状の弁ディスクを変圧室に配置したものにおいて、噴出孔の変圧室側端を大径に形成し大径部に噴出孔の外周壁を摺動する内輪シールリングを配置し、弁ディスクの開弁時に内輪シールリングの上端を内輪弁座と外輪弁座よりも僅かに突出させる弾性部材としてのバネを、大径部の底壁と内輪シールリングの下面との間に設け、環状溝に環状溝の外周壁を摺動する外輪シールリングを配置し、弁ディスクの開弁時に外輪シールリングの上端を内輪弁座と外輪弁座よりも僅かに突出させる弾性部材としてのバネを、環状溝の底壁と外輪シールリングの下面との間に設けたことを特徴とするディスク式スチームトラップ。A lid is fixed to the main body having an inlet and an outlet to form a variable pressure chamber inside, and an injection hole that opens at the center of the variable pressure chamber is provided so that the inlet and the variable pressure chamber communicate with each other. A groove is provided to form an inner ring valve seat between the ejection hole and the annular groove, and an outer ring valve seat that is flush with the inner ring valve seat is formed around the outer periphery of the annular groove. The disk-shaped valve disk that communicates with the chamber and the outlet and that is attached to and detached from the inner ring valve seat and the outer ring valve seat is arranged in the variable pressure chamber. An inner ring seal ring that slides on the outer peripheral wall of the ejection hole is arranged, and a spring as an elastic member that projects the upper end of the inner ring seal ring slightly from the inner ring valve seat and the outer ring valve seat when the valve disc is opened has a large diameter. provided between the bottom wall and the lower surface of the inner ring seal ring parts, an outer sliding the outer peripheral wall of the annular groove to the annular groove A seal ring is disposed, the spring of the upper end of the outer ring seal ring during opening of the valve disk as the elastic member to slightly protrude than the inner ring valve seat and the outer ring valve seat, a lower surface of the bottom wall and the outer ring seal ring annular groove A disc-type steam trap characterized by being provided between the two .