JP2003028388A - Disc type steam trap - Google Patents
Disc type steam trapInfo
- Publication number
- JP2003028388A JP2003028388A JP2001213894A JP2001213894A JP2003028388A JP 2003028388 A JP2003028388 A JP 2003028388A JP 2001213894 A JP2001213894 A JP 2001213894A JP 2001213894 A JP2001213894 A JP 2001213894A JP 2003028388 A JP2003028388 A JP 2003028388A
- Authority
- JP
- Japan
- Prior art keywords
- valve seat
- ring valve
- inner ring
- annular groove
- pressure chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Temperature-Responsive Valves (AREA)
Abstract
Description
【発明の詳細な説明】
【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、噴出孔に噴出孔の外周壁を摺動
するシールリングを配置し、弁ディスクの開弁時にシー
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
させる弾性部材を設けたものである。
【０００６】
【発明の実施の形態】本発明は、噴出孔に噴出孔の外周
壁を摺動するシールリングを配置し、弁ディスクの開弁
時に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を設けたものである。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、弁ディスクが弾性部材の付勢
力に抗して下方に変位し、外輪弁座とシールリングとの
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外輪弁座とシールリング
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シールリング
１２を配置し、大径部の底壁とシールリング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。
【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
合が小さくなるが、波形バネ１３の付勢力に抗して下方
に変位し、外輪弁座１０とシールリング１２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が外輪弁座１０とシールリ
ング１２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外
輪弁座と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。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variety of devices using steam, such as a valve disc, which opens and closes in response to a pressure change in a variable pressure chamber, that is, a thermodynamic steam chamber. The present invention relates to a disc-type steam trap that automatically discharges condensate generated in a steam pipe, and more particularly to a steam trap having a high temperature and a high pressure (generally, a steam trap having a pressure of 16 kg / cm 2 and 220 ° C. or higher). [0002] The basic structure of a disk-type steam trap is as follows. A lid is fixed to a main body having an inlet and an outlet to form a variable pressure chamber inside, and an ejection hole opened at the center of the variable pressure chamber is provided. And an annular groove that opens around the outer periphery of the ejection hole 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 around the outer periphery of the annular groove. A discharge hole is provided from the annular groove to communicate the variable pressure chamber with the outlet, and a disc-shaped valve disk that is separated from and seated on the inner ring valve seat and the outer ring valve seat is disposed in the variable pressure chamber. The self-powered control is carried out by the pressure change of the variable pressure chamber, the inner ring valve seat and the outer ring valve seat are separated and seated, and the condensate is automatically discharged. When this disc-type steam trap is used in a high-temperature, high-pressure steam system, there is a problem that a slight gap is formed between the valve disc and the inner ring valve seat, and steam leaks. This is because when the valve is closed, the inlet side pressure of high temperature and high pressure acts on the center of the lower surface of the valve disk, and the pressure of the variable pressure chamber acts on the upper surface of the valve disk. This is because a small gap is formed between the outer ring valve seat and the inner ring valve seat. [0003] Conventionally, Japanese Patent Publication No. 48-15342 discloses a conventional technique.
A technique as shown in Japanese Patent Application Laid-Open No. H10-209,794 was used. This is because, by forming the center portion of the lower surface of the valve disk so as to slightly protrude below the outer peripheral portion, even if the valve disk curves upwardly convex at the time of closing the valve, the valve disk is in contact with the inner ring valve seat and the outer ring. It can be in close contact with the valve seat. [0004] In the above-mentioned conventional disk-type steam trap, the close contact between the valve disk and the inner ring valve seat and the outer ring valve seat can be maintained immediately after the valve is closed. As a result, a slight gap is formed between the outer ring valve seat and the valve disc, so 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 with a decrease in the pressure of the variable pressure chamber, so that the valve disk is in close contact with the inner ring valve seat but generates a slight gap between the valve disk and the outer ring valve seat. . Accordingly, it is an object of the present invention to provide a disc-type steam trap in which the valve disc does not open prematurely. Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is to fix a lid to a main body having an inlet and an outlet and to form a transformer chamber inside. Forming, providing an ejection hole opening at the center of the transformation chamber, communicating the inlet with the transformation chamber, providing an annular groove opening around the outside of the ejection hole, forming an inner ring valve seat between the ejection hole and the annular groove At the same time, an outer ring valve seat is formed on the outer periphery of the annular groove on the same plane as the inner ring valve seat, a discharge hole is provided from the annular groove to communicate the variable pressure chamber with the outlet, and the inner ring valve seat and the outer ring valve seat are separated and seated. A disk-shaped valve disk is arranged in a variable pressure chamber, and a seal ring that slides on the outer peripheral wall of the discharge hole is disposed in the discharge hole, and when the valve disk is opened, the upper end of the seal ring is set to the inner ring valve seat and the outer ring valve. An elastic member is provided to slightly protrude from the seat. According to the present invention, a seal ring which slides on an outer peripheral wall of a discharge hole is disposed in a discharge hole, and the upper end of the seal ring is closed at the time of opening of a valve disc by an inner ring valve seat and an outer ring valve seat. An elastic member that protrudes slightly more is provided. Therefore, immediately after the valve is closed, the valve disk is in close contact with the outer ring valve seat and the seal ring. When the degree of curvature of the valve disk decreases due to the pressure drop in the variable pressure chamber, the valve disk is displaced downward against the urging force of the elastic member, and the close contact between the outer ring valve seat and the seal ring is maintained. Then, after the pressure in the variable pressure chamber has decreased to a predetermined valve opening pressure, the valve disk separates from the outer ring valve seat and the seal ring and opens. An embodiment showing a specific example of the above technical means will be described (see FIG. 1). A transformer 2 is formed by screwing a lid 2 to the main body 1. An inlet 4 and an outlet 5 are formed on the main body 1 on substantially the same axis. An ejection hole 6 opening in the center of the transformation chamber 3 is opened in the main body 1, and the inlet 4 and the transformation chamber 3 communicate with each other through the ejection hole 6. An annular groove 8 is provided around the outside of the ejection hole 6,
An annular inner ring valve seat 9 is formed between the ejection hole 6 and the annular groove 8,
On the outer periphery of the annular groove 8, an annular outer ring valve seat 10 concentric with the inner ring valve seat 9 and flush with the inner ring valve seat 9 is formed. The end of the annular groove 8 communicates with the outlet 5 through the discharge hole 7. A disc-shaped valve disc 11 that detaches and seats on the inner ring valve seat 9 and the outer ring valve seat 10 to open and close the valve
In the transformer chamber 3 in a free state. The end of the discharge hole 6 on the side of the transformer chamber 3 is formed to have a slightly large diameter, and a seal ring 12 sliding on the outer peripheral wall of the discharge hole 6 is disposed in the large diameter portion. 12 and the lower surface of the seal ring 12 when the valve disc 11 is opened.
A ring-shaped wave spring 13 is disposed as an elastic member for projecting the upper end of the ring from the inner ring valve seat 9 and the outer ring valve seat 10 slightly. Next, the operation will be described. When no steam is retained in the variable pressure chamber 3, the valve disc 11
The fluid pressure on the inlet 4 acting on the valve disc 11
Is separated from the inner and outer ring valve seats 9 and 10 to condense low-temperature condensate
To the outlet 5 through the discharge hole 7. When the condensate is discharged and steam flows into the variable pressure chamber 3, the pressure in the variable pressure chamber 3 increases, and high-speed steam flows down the lower surface of the valve disk 11 to lower the static pressure. As a result, the valve disc 11 is seated on the outer ring valve seat 10 and the seal ring 12 against the urging force of the wave spring 13 to close the valve. When the steam in the variable pressure chamber 3 is condensed by heat radiation and the steam pressure is reduced, the degree of curvature of the valve disk 11 is reduced, but the valve disk 11 is displaced downward against the urging force of the wave spring 13. In addition, the close contact between the outer ring valve seat 10 and the seal ring 12 is maintained. Then, after the pressure in the variable pressure chamber 3 decreases to a predetermined valve opening pressure, the valve disk 11 separates from the outer ring valve seat 10 and the seal ring 12 and opens. The above-described on-off valve cycle is repeated. As described above, according to the present invention, the valve disc is in close contact with the outer ring valve seat and the seal ring until the pressure in the variable pressure chamber decreases to the predetermined valve opening pressure. Can be prevented from opening. Therefore, there is an excellent effect that frequent on-off valves can be prevented and the life can be extended.
【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 シールリング
１３ 波形バネ
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an embodiment of a disc-type steam trap according to the present invention. [Description of Signs] 1 Main body 2 Lid 3 Transformation chamber 4 Inlet 5 Outlet 6 Spout hole 7 Drain hole 8 Annular groove 9 Inner ring valve seat 10 Outer ring valve seat 11 Valve disc 12 Seal ring 13 Wave spring
Claims (1)
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
出孔に噴出孔の外周壁を摺動するシールリングを配置
し、弁ディスクの開弁時に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を設けた
ことを特徴とするディスク式スチームトラップ。Claims: 1. A variable pressure chamber is formed by fixing a lid to a main body having an inlet and an outlet, and an ejection hole is provided at the center of the variable pressure chamber to communicate the inlet with the variable pressure chamber. An annular groove that opens around the outer periphery of the ejection hole 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 around the outer periphery of the annular groove. A discharge hole is provided from the annular groove to communicate the variable pressure chamber with the outlet, and a disk-shaped valve disk that is detachably seated on the inner ring valve seat and the outer ring valve seat is disposed in the variable pressure chamber. A disc-type steam trap having a seal ring that slides on an outer peripheral wall and an elastic member that slightly protrudes the upper end of the seal ring from the inner ring valve seat and the outer ring valve seat when the valve disc is opened. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001213894A JP2003028388A (en) | 2001-07-13 | 2001-07-13 | Disc type steam trap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001213894A JP2003028388A (en) | 2001-07-13 | 2001-07-13 | Disc type steam trap |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003028388A true JP2003028388A (en) | 2003-01-29 |
Family
ID=19048800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001213894A Pending JP2003028388A (en) | 2001-07-13 | 2001-07-13 | Disc type steam trap |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003028388A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010286106A (en) * | 2009-06-15 | 2010-12-24 | Tlv Co Ltd | Disc type steam trap |
| JP2012107650A (en) * | 2010-11-15 | 2012-06-07 | Tlv Co Ltd | Disk type steam trap |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08285187A (en) * | 1995-04-14 | 1996-11-01 | Tlv Co Ltd | Disk type steam trap |
-
2001
- 2001-07-13 JP JP2001213894A patent/JP2003028388A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08285187A (en) * | 1995-04-14 | 1996-11-01 | Tlv Co Ltd | Disk type steam trap |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010286106A (en) * | 2009-06-15 | 2010-12-24 | Tlv Co Ltd | Disc type steam trap |
| JP2012107650A (en) * | 2010-11-15 | 2012-06-07 | Tlv Co Ltd | Disk type steam trap |
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