JPH10227395A - Float type drain trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a float type drain trap which hardly causes biting of foreign materials between a valve body and a valve port and is opened/closed with one float under all pressure states from low to high pressure conditions. SOLUTION: An inlet 4, a valve chamber 3, and an outlet 5 are formed by a main body 1 and a bottom cover 2. A valve port 8 is formed for communicating the valve chamber 3 with the outlet 5. A float 10 to which a valve body 12 is connected is arranged inside the valve chamber 3. The valve port 8 is opened and closed by means of the valve body 12 due to ascending and discending of the float 10. The float 10 is cylindrically formed. An upper end of the cylindrical float 10 is extended upward compared to a lower end of an opening of the inlet 4 on the side of the valve chamber 3. The valve body 12 is connected to the inner side of the cylindrical float 10. A diaphragm 18 is connected to the lower side of the cylindrical float 10, which diaphragm 18 has the same pressure receiving area as an opening area of the valve port 8, and receives fluid pressure from the inlet 4 and the outlet 5 in the direction opposite to the valve body 12.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、気体と液体の比重
差を利用して、弁室内に収容したフロ―トで弁体を駆動
し、蒸気や圧縮空気及びガス配管系に発生する復水や凝
縮水等のドレンを自動的に排出するフロ―ト式ドレント
ラップに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes a specific gravity difference between a gas and a liquid to drive a valve body with a float housed in a valve chamber to condense steam, compressed air, and condensate generated in a gas piping system. Float type drain trap for automatically discharging drain such as water and condensed water.

【０００２】[0002]

【従来の技術】従来のフロ―ト式ドレントラップは、例
えば特公平７−９２１９５号公報に示されている。当該
公報から理解されるように、ケ―シングで入口と弁室と
出口を形成し、弁室と出口を連通する弁口を弁室低部に
設け、弁口を開閉する弁体を連結したフロ―トを弁室内
に配置したものであり、入口から弁室へ流入するドレン
により液面が上がると、フロ―トが浮上して弁体が弁口
を開くことによりドレンを外部に排出せしめ、ドレンの
排出により弁室内の液面が下がると、フロ―トが降下し
て弁体が弁口を閉じることにより気体の流出（漏れ）を
防止する。2. Description of the Related Art A conventional float type drain trap is disclosed, for example, in Japanese Patent Publication No. 7-92195. As understood from the publication, an inlet, a valve chamber, and an outlet are formed by casing, a valve port communicating the valve chamber with the outlet is provided in a lower portion of the valve chamber, and a valve body for opening and closing the valve port is connected. The float is placed in the valve chamber. When the liquid level rises due to the drain flowing into the valve chamber from the inlet, the float floats up and the valve body opens the valve port to discharge the drain to the outside. When the liquid level in the valve chamber drops due to the discharge of the drain, the float lowers and the valve body closes the valve port, thereby preventing gas outflow (leakage).

【０００３】[0003]

【発明が解決しようとする課題】上記従来のフロ―ト式
ドレントラップは、流体に混在して弁室内に流入したゴ
ミやスケ―ル等の異物を弁体と弁口の間に噛み込み易
く、完全閉弁できなくなって漏れを生じ易いという問題
点があった、これは、弁室低部に弁体と弁口が位置する
ために、弁室底部に流下する異物が弁体や弁口の表面に
付着し易く、弁室底部に溜った異物が排出ドレンと共に
弁口に流れ込み易いためである。In the above-mentioned conventional float type drain trap, foreign matters such as dust and scale mixed into a fluid and flowed into the valve chamber are easily caught between the valve body and the valve port. However, there was a problem that the valve could not be completely closed and leaks easily. This is because the valve element and the valve port are located in the lower part of the valve chamber, so that foreign substances flowing down to the bottom of the valve chamber may be disturbed. This is because the foreign matter easily adheres to the surface of the valve chamber, and foreign matters collected at the bottom of the valve chamber easily flow into the valve port together with the discharge drain.

【０００４】また上記従来のフロ―ト式ドレントラップ
においては、排出できるドレン量は弁口面積の大きさに
よって決まり、弁口面積の大きさと弁口前後の圧力差に
よって作動するために必要なフロ―トの浮力が決められ
るのであるが、低圧から高圧まで同じフロ―トを用いる
と、低圧では大きな弁口面積が得られ、高圧では小さな
弁口面積とならざるを得ず、圧力範囲に応じて多種類の
弁口を有した弁座を揃えて取り替え交換しなければなら
ないという問題点があった。Further, in the above-mentioned conventional float type drain trap, the amount of drain that can be discharged is determined by the size of the valve port area, and the amount of drain required to operate according to the size of the valve port area and the pressure difference before and after the valve port. -The buoyancy of the port is determined, but if the same float is used from low pressure to high pressure, a large valve opening area can be obtained at low pressure and a small valve opening area at high pressure. Therefore, there is a problem that the valve seat having various kinds of valve ports must be replaced and exchanged.

【０００５】従って、本発明の技術的課題は、弁体と弁
口の間に異物を噛み込み難いと共に、低圧から高圧まで
同一のフロ―トを用いて開閉作動できるフロ―ト式ドレ
ントラップを提供することである。SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a float type drain trap in which foreign matter is hardly caught between a valve body and a valve port and which can be opened and closed from low pressure to high pressure using the same float. To provide.

【０００６】[0006]

【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、ケ―シングで
入口と弁室と出口を形成し、弁室と出口を連通する弁口
を設け、弁体を連結したフロ―トを弁室内に配置してフ
ロ―トの浮上降下により弁体で弁口を開閉するものにお
いて、フロ―トを筒状に形成し、筒状フロ―トの上端を
入口の弁室側開口下端よりも上方に延ばし、弁口の弁室
側開口端を筒状フロ―トの内側に位置させると共に、弁
体を筒状フロ―トの内側に連結し、弁口の開口面積と同
一の受圧面積を有し弁体とは逆向きに入口と出口の流体
圧力が作用する受圧応動部材を筒状フロ―トの下方に連
結したことを特徴とするフロ―ト式ドレントラップにあ
る。Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is to form an inlet, a valve chamber, and an outlet by casing, and to communicate the valve chamber with the outlet. A valve having a valve port, a valve connecting the valve element is disposed in the valve chamber, and the valve port is opened and closed by the floating of the float. The upper end of the float extends above the lower end of the inlet on the valve chamber side, the open end of the valve port on the valve chamber side is positioned inside the cylindrical float, and the valve body is positioned inside the cylindrical float. And a pressure-responsive member, which has the same pressure-receiving area as the opening area of the valve port and has the inlet and outlet fluid pressures acting in the opposite direction to the valve body, is connected below the cylindrical float. Float type drain trap.

【０００７】[0007]

【発明の実施の形態】本発明のフロ―ト式ドレントラッ
プは、筒状フロ―トの上端を入口の弁室側開口下端より
も上方に延ばし、弁口の弁室側開口端を筒状フロ―トの
内側に位置させると共に、弁体を筒状フロ―トの内側に
連結している。そのため、弁室内に流入した異物の殆ど
を筒状フロ―トの外側を流下させることができ、弁体と
弁口の位置を高くして弁室底部から離すことができる。
そのため、弁体と弁口の間に異物を噛み込み難くなる。DESCRIPTION OF THE PREFERRED EMBODIMENTS In a float type drain trap according to the present invention, the upper end of a cylindrical float extends above the lower end of an inlet on the valve chamber side, and the open end of the valve port on the valve chamber side is cylindrical. The valve is located inside the float and the valve body is connected to the inside of the tubular float. Therefore, most of the foreign matter that has flowed into the valve chamber can flow down the outside of the cylindrical float, and the position of the valve element and the valve port can be increased to be separated from the bottom of the valve chamber.
Therefore, it is difficult for foreign matter to be caught between the valve body and the valve port.

【０００８】また本発明のフロ―ト式ドレントラップ
は、弁口の開口面積と同一の受圧面積を有し弁体とは逆
向きに入口と出口の流体圧力が作用する受圧応動部材を
筒状フロ―トの下方に連結している。そのため、弁体に
作用する流体圧力を受圧応動部材に作用する流体圧力に
よって打ち消すことができる。そのため、低圧から高圧
まで同一のフロ―トを用いて開閉作動を行うことができ
る。The float type drain trap of the present invention has a cylindrical pressure receiving responsive member having the same pressure receiving area as the opening area of the valve port and having the inlet and outlet fluid pressures acting in opposite directions to the valve body. Connected below the float. Therefore, the fluid pressure acting on the valve body can be canceled by the fluid pressure acting on the pressure receiving responsive member. Therefore, the opening and closing operation can be performed using the same float from low pressure to high pressure.

【０００９】[0009]

【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）。本実施例はフロ―ト式スチ―ムト
ラップに適用したものである。An embodiment showing a specific example of the above technical means will be described (see FIG. 1). This embodiment is applied to a float type steam trap.

【００１０】本体１に底蓋２を締結して内部に弁室３を
有するケ―シングを形成する。本体１の上部に入口４と
出口５を同一軸上に形成する。入口４は弁室３の上部に
連通する。本体１に頂壁から弁室３のほぼ中央まで延び
る仕切壁６を設け、仕切壁６に出口５に連通する出口通
路７を形成する。仕切壁６の底壁に弁口８を有する弁座
９を固着する。弁室３は弁口８から出口通路７を通して
出口５に連通する。A casing having a valve chamber 3 therein is formed by fastening a bottom cover 2 to the main body 1. An inlet 4 and an outlet 5 are formed on the same axis at the upper part of the main body 1. The inlet 4 communicates with the upper part of the valve chamber 3. A partition wall 6 extending from the top wall to substantially the center of the valve chamber 3 is provided in the main body 1, and an outlet passage 7 communicating with the outlet 5 is formed in the partition wall 6. A valve seat 9 having a valve port 8 is fixed to the bottom wall of the partition wall 6. The valve chamber 3 communicates with the outlet 5 from the valve port 8 through the outlet passage 7.

【００１１】仕切壁６の外側に有底円筒形状のフロ―ト
１０を配置する。フロ―ト１０の内側に弁口８が位置す
る。フロ―ト１０の上端は入口４の弁室３側開口下端よ
りも上方に延ばす。フロ―ト１０の底壁に内側と下方を
連通する連通孔１１を複数個開ける。フロ―ト１０の底
壁上面に弁口８を開閉する弁体１２を固着する。弁体１
２はフロ―ト１０の内側に位置し、入口４の流体圧力が
開弁方向に作用し、出口５の流体圧力が閉弁方向に作用
する。弁体１２に上方に延びる弁棒部１３を形成し、仕
切壁６の案内孔１４に上下動自在に嵌合する。A bottomed cylindrical float 10 is arranged outside the partition wall 6. The valve port 8 is located inside the float 10. The upper end of the float 10 extends above the lower end of the opening 4 of the inlet 4 on the valve chamber 3 side. A plurality of communication holes 11 are formed in the bottom wall of the float 10 to communicate the inside and the bottom. A valve body 12 for opening and closing the valve port 8 is fixed to the upper surface of the bottom wall of the float 10. Valve body 1
Numeral 2 is located inside the float 10, and the fluid pressure at the inlet 4 acts in the valve opening direction and the fluid pressure at the outlet 5 acts in the valve closing direction. An upwardly extending valve rod portion 13 is formed in the valve body 12 and is fitted into the guide hole 14 of the partition wall 6 so as to be vertically movable.

【００１２】フロ―ト１０の底壁下面に案内棒１５を固
着し、案内棒１５の下部を底蓋２の案内孔１６に上下動
自在に嵌合する。案内棒１５の中部に受圧応動部材とし
てのダイヤフラム１８を連結する。ダイヤフラム１８は
内周縁を案内棒１５に固着し、外周縁を底壁２に固着し
た取付部材１９に固着する。ダイヤフラム１８の有効受
圧面積は弁口８の開口面積と同一に形成し、ダイヤフラ
ム１８の上面には入口４の流体圧力が弁体１２を閉弁さ
せる方向に作用し、下面には出口圧導入路２０を介して
出口５の流体圧力が弁体１２を開弁させる方向に作用す
る。フロ―ト１０の外側に入口４から弁室３に流入する
異物を捕捉する円筒形状のスクリ―ン１７を配置する。A guide rod 15 is fixed to the lower surface of the bottom wall of the float 10 and a lower portion of the guide rod 15 is fitted into a guide hole 16 of the bottom cover 2 so as to be vertically movable. A diaphragm 18 as a pressure-responsive member is connected to the center of the guide rod 15. The diaphragm 18 has an inner peripheral edge fixed to the guide rod 15 and an outer peripheral edge fixed to a mounting member 19 fixed to the bottom wall 2. The effective pressure receiving area of the diaphragm 18 is formed to be the same as the opening area of the valve port 8, the fluid pressure at the inlet 4 acts on the upper surface of the diaphragm 18 in a direction to close the valve body 12, and the outlet pressure introducing passage at the lower surface. The fluid pressure at the outlet 5 via 20 acts in a direction to open the valve body 12. A cylindrical screen 17 for catching foreign matter flowing into the valve chamber 3 from the inlet 4 is disposed outside the float 10.

【００１３】次に本実施例のフロ―ト式スチ―ムトラッ
プの作動を説明する。図１に示す状態は、フロ―ト１０
が降下して弁体１２が弁口８を閉じた状態を示してい
る。復水と蒸気が入口４からスクリ―ン１７を通して弁
室３に流入し、復水が下部に蒸気が上部に分離して溜
る。復水の流入によって液面が上がるとフロ―ト１０は
浮力が大きくなるので浮上し、弁体１２が弁口８を開
く。これにより、弁室３の復水が弁口８から出口通路７
を通して出口５に排出される。弁体１２とダイヤフラム
１８に作用する流体圧力を互いに逆向きに等しくしてい
るので、低圧から高圧まで同一のフロ―トを用いて開閉
作動を行うことができる。復水の排出により弁室３内の
液面が下がると、それと共にフロ―ト１０が降下し、弁
体１２が弁口８を閉じる。これにより、蒸気の流出を防
止する。Next, the operation of the float type steam trap of this embodiment will be described. The state shown in FIG.
Is lowered, and the valve body 12 closes the valve port 8. Condensate and steam flow into the valve chamber 3 from the inlet 4 through the screen 17, and the condensate separates at the bottom and the steam separates at the top and accumulates. When the liquid level rises due to the inflow of condensate water, the float 10 rises because of its increased buoyancy, and the valve body 12 opens the valve port 8. As a result, the condensate in the valve chamber 3 is transferred from the valve port 8 to the outlet passage 7.
Through to the outlet 5. Since the fluid pressures acting on the valve element 12 and the diaphragm 18 are made equal in opposite directions, the opening and closing operation can be performed using the same float from low pressure to high pressure. When the liquid level in the valve chamber 3 drops due to the discharge of the condensate water, the float 10 descends with this, and the valve body 12 closes the valve port 8. This prevents the outflow of steam.

【００１４】スクリ―ン１７のメッシュより大きな異物
はスクリ―ン１７で捕捉され、小さな異物がスクリ―ン
１７を通過する。スクリ―ン１７を通過した小さな異物
は、フロ―ト１０の上端を越えて内側に流入し難く、殆
どがフロ―ト１０の外側を流下して弁室３の底部に溜る
ので、弁体１２や弁口８の表面に付着し難くなる。また
弁室底部に溜った小さな異物は、上方に位置するフロ―
ト１０の内側の弁口に流れ込み難くなる。これにより、
弁体と弁口の間に異物を噛み込むことが少なくなる。Foreign matter larger than the mesh of the screen 17 is captured by the screen 17, and small foreign matter passes through the screen 17. The small foreign matter that has passed through the screen 17 is unlikely to flow inward beyond the upper end of the float 10, and most of the foreign matter flows down the outside of the float 10 and accumulates at the bottom of the valve chamber 3. Or on the surface of the valve port 8. In addition, small foreign matter that has accumulated at the bottom of the valve chamber is
It becomes difficult to flow into the valve port inside the gate 10. This allows
Foreign matter is less likely to be caught between the valve body and the valve port.

【００１５】[0015]

【発明の効果】本発明は下記の特有の効果を生じる。上
記のように本発明によるフロ―ト式ドレントラップは、
弁体と弁口の間に異物を噛み込み難いので、漏れのない
初期の良好な作動を長期に渡って維持することが可能と
なる。また低圧から高圧まで同一のフロ―トを用いて開
閉作動を行うことができるので、多種類の弁口を有した
弁座を揃えておく必要がない。The present invention has the following specific effects. As described above, the float type drain trap according to the present invention is
Since it is difficult for foreign matter to bite between the valve body and the valve port, it is possible to maintain good initial operation without leakage for a long period of time. In addition, since opening and closing operations can be performed using the same float from low pressure to high pressure, there is no need to arrange valve seats having various types of valve ports.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の実施例のフロ―ト式スチ―ムトラップ
の断面図である。FIG. 1 is a cross-sectional view of a float type steam trap according to an embodiment of the present invention.

【符号の説明】[Explanation of symbols]

１ 本体 ２ 底蓋 ３ 弁室 ４ 入口 ５ 出口 ８ 弁口 １０ フロ―ト １２ 弁体 １８ スクリ―ン ２０ 出口圧導入路 DESCRIPTION OF SYMBOLS 1 Main body 2 Bottom cover 3 Valve room 4 Inlet 5 Outlet 8 Valve port 10 Float 12 Valve element 18 Screen 20 Outlet pressure introduction path

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 ケ―シングで入口と弁室と出口を形成
し、弁室と出口を連通する弁口を設け、弁体を連結した
フロ―トを弁室内に配置してフロ―トの浮上降下により
弁体で弁口を開閉するものにおいて、フロ―トを筒状に
形成し、筒状フロ―トの上端を入口の弁室側開口下端よ
りも上方に延ばし、弁口の弁室側開口端を筒状フロ―ト
の内側に位置させると共に、弁体を筒状フロ―トの内側
に連結し、弁口の開口面積と同一の受圧面積を有し弁体
とは逆向きに入口と出口の流体圧力が作用する受圧応動
部材を筒状フロ―トの下方に連結したことを特徴とする
フロ―ト式ドレントラップ。An inlet, a valve chamber, and an outlet are formed by casing, a valve port for communicating the valve chamber with the outlet is provided, and a float connected to the valve body is disposed in the valve chamber. The valve opening is opened and closed by a valve body by floating descending, the float is formed in a cylindrical shape, and the upper end of the cylindrical float is extended above the lower end of the opening on the valve chamber side of the inlet. The side opening end is located inside the cylindrical float, and the valve body is connected to the inside of the cylindrical float, and has the same pressure receiving area as the opening area of the valve port and is opposite to the valve body. A float type drain trap, characterized in that a pressure receiving responsive member on which inlet and outlet fluid pressures act is connected below a cylindrical float.