【０００１】
【発明の属する技術分野】
本発明は、蒸気配管系に発生する復水を自動的に排出するスチームトラップに関し、特に密閉のフロートで直接にあるいは弁部材等を介して弁孔を開閉するフロート式スチームトラップにおいて、低温時に弁孔を開けるようにしたものに関する。フロート式スチームトラップは、蒸気と復水の比重差を利用して蒸気は排出せずに復水のみを自動的に排出するものであるが、弁室内に非凝縮気体である空気が流入すると、蒸気と同様に弁孔を閉じるのでエアバインディングを起こす問題があった。
【０００２】
【従来の技術】
【特許文献１】
実公昭４８−８７４２号公報
そこで、従来は、実公昭４８−８７４２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、ケー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孔を弁室内に配置したフロートで開閉し、弁室内に配置した温度応動部材で低温時にフロートが弁孔を閉じることを妨げ高温時にフロートに干渉しないようにしたものである。
【０００３】
【発明が解決しようとする課題】
上記従来のフロート式スチームトラップは、弁室内に配置した温度応動部材で低温時にフロートが弁孔を閉じることを妨げることにより、低温空気を弁孔から排出してエアバインディングを防止するものであるが、弁孔から排出できる低温空気量には限るがあるので、特に配管系の初期立ち上げ時のように多量の低温空気を排出しなければならない場合に時間が掛かる問題があった。また、弁室内の弁孔よりも下に復水が溜まっているので、配管系の送気が止められた休止時に低温復水が凍結してフロートが破損する問題があった。
【０００４】
従って、本発明の技術的課題は、多量の低温空気を素早く排出できると共に、休止時に弁孔よりも下の低温復水を排出できるフロート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、ケー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通過面積の大きな大弁孔を弁室下端に形成し、弁室内に温度応動部材の一端を取り付け、温度応動部材の他端に大弁孔を低温時に開け高温時に閉じる弁部材を取り付け、弁部材に弁孔を形成し、弁孔を開閉するフロートを弁室内に配置したことを特徴とするフロート式スチームトラップにある。
【０００６】
【発明の実施の形態】
本発明のフロート式スチームトラップは、弁室と出口を連通する通過面積の大きな大弁孔を弁室下端に形成し、弁室内に温度応動部材の一端を取り付け、温度応動部材の他端に大弁孔を低温時に開け高温時に閉じる弁部材を取り付けたものである。そのため、低温時には通過面積の大きな大弁孔から多量の低温空気を素早く排出できる。また、低温となる休止時には弁室下端の大弁孔から低温復水を排出できる。
【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）。図１に本発明のフロート式スチームトラップの断面図を示す。本実施例はフリーフロート式スチームトラップに適用したものである。フリーフロート式スチームトラップのケーシングは入口側部材１と出口側部材２を間に気密を保つためのシール部材３を介在させて取付部材４で固定して形成する。入口側部材１に入口５を形成し、入口側部材１と出口側部材２の間に弁室６を形成し、出口側部材２に出口７と通過面積の大きな大弁孔８を形成する。入口５は弁室６の上部に連通する。弁室６の下部は大弁孔８を介して下方の出口７に連通する。
【０００８】
弁室６内に温度応動部材としてのバイメタル９を配置する。バイメタル９は断面形状がほぼＵ字状で一端側をビス１０で出口側部材２に固定し、他端側をビス１１で弁部材１２に固定する。バイメタル９は高温時にＵ字状が狭まるように変形して弁部材１２で大弁孔８を閉じ、低温時にＵ字状が拡がるように変形して弁部材１２で大弁孔８を開ける。
【０００９】
弁部材１２に大弁孔８よりも通過面積の小さな弁孔１３を形成する。弁室６内に弁孔１３を開閉する中空球形のフロート１４を自由状態で配置する。フロート１４が弁孔１３を閉じた位置で当接するフロート座１５をフロート１４の下方に、図面の手前側と向う側に２つ設ける。
【００１０】
上記実施例のフリーフロート式スチームトラップの動作は下記の通りである。蒸気配管系の初期立ち上げ時のように多量の低温の空気と復水が弁室６内に流入する場合、バイメタル９はＵ字状が拡がるように変形して弁部材１２で大弁孔８を開け、多量の低温の空気と復水を大弁孔８から素早く出口７に排出する。
【００１１】
低温の空気と復水の排出によって弁室６内に流入する復水の温度が高くなると、バイメタル９はＵ字状が狭まるように変形して弁部材１２で大弁孔８を閉じる。フロート１４は弁室６内の復水量に応じて浮上降下して弁孔１３を開閉し、復水を弁孔１２から大弁孔８を通して出口７に排出する。空気が弁室６内に流入してきて弁室６内の温度が所定以下に低下すると、バイメタル９はＵ字状が拡がるように変形して弁部材１２で大弁孔８を開け、空気を大弁孔８から素早く出口７に排出する。
【００１２】
配管系の送気が止められた休止時には弁室６内の温度が所定以下に低下すると、バイメタル９はＵ字状が拡がるように変形して弁部材１２で大弁孔８を開け、低温復水を大弁孔８から出口６に排出する。
【００１３】
上記実施例では、本発明をフリーフロート式スチームトラップに適用したが、レバーフロート式スチームトラップにも適用することができる。
【００１４】
【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れば、弁室下端に形成された通過面積の大きな大弁孔を低温時に開けることにより、大弁孔から多量の低温空気を素早く排出できると共に、休止時に大弁孔から低温復水を排出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】本発明のフロート式スチームトラップをフリーフロート式スチームトラップに適用した実施例の断面図である。
【符号の説明】
１ 入口側部材
２ 出口側部材
５ 入口
６ 弁室
７ 出口
８ 大弁孔
９ バイメタル
１２ 弁部材
１３ 弁孔
１４ フロート[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a steam trap that automatically discharges condensate generated in a steam piping system, and particularly to a float type steam trap that opens and closes a valve hole directly with a closed float or through a valve member or the like. It relates to a device for making a hole. The float type steam trap uses the difference in specific gravity between steam and condensate to automatically discharge only condensate without discharging steam, but when air, which is a non-condensed gas, flows into the valve chamber, There is a problem that air binding occurs because the valve hole is closed as in the case of steam.
[0002]
[Prior art]
[Patent Document 1]
Japanese Patent Publication No. 48-8742 discloses a technique as disclosed in Japanese Utility Model Publication No. 48-8742. In this method, an inlet, a valve chamber, and an outlet are formed in a casing, and a valve hole communicating the valve chamber and the outlet is opened and closed by a float disposed in the valve chamber. This prevents the float from closing and does not interfere with the float at high temperatures.
[0003]
[Problems to be solved by the invention]
The above-mentioned conventional float-type steam trap is a device in which a float is closed by a temperature-responsive member disposed in a valve chamber at a low temperature to prevent air binding by discharging low-temperature air from the valve hole. However, since the amount of low-temperature air that can be discharged from the valve hole is limited, there is a problem that it takes time especially when a large amount of low-temperature air must be discharged, such as at the initial startup of a piping system. Further, since the condensate is stored below the valve hole in the valve chamber, there is a problem that the low-temperature condensate freezes and breaks the float when the piping system is stopped when the air supply is stopped.
[0004]
Accordingly, it is an object of the present invention to provide a float-type steam trap that can quickly discharge a large amount of low-temperature air and discharge low-temperature condensate below a valve hole at rest.
[0005]
[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 in a casing, and to form a large valve hole having a large passage area communicating the valve chamber with the outlet at the lower end of the valve chamber. One end of the temperature responsive member is installed in the valve chamber, and a large valve hole is opened at the other end of the temperature responsive member at a low temperature and a valve member closed at a high temperature is installed. The float type steam trap is characterized in that a float is placed in a valve chamber.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
In the float type steam trap of the present invention, a large valve hole having a large passage area communicating the valve chamber and the outlet is formed at the lower end of the valve chamber, one end of the temperature responsive member is mounted in the valve chamber, and the other end of the temperature responsive member is large. A valve member is provided which opens a valve hole at low temperature and closes at high temperature. Therefore, at a low temperature, a large amount of low-temperature air can be quickly discharged from a large valve hole having a large passage area. Also, at the time of suspension when the temperature becomes low, low-temperature condensate can be discharged from the large valve hole at the lower end of the valve chamber.
[0007]
【Example】
An embodiment showing a specific example of the above technical means will be described (see FIG. 1). FIG. 1 shows a sectional view of a float type steam trap of the present invention. This embodiment is applied to a free float steam trap. The casing of the free-float type steam trap is formed by fixing the inlet-side member 1 and the outlet-side member 2 with the mounting member 4 with the seal member 3 interposed therebetween for keeping the airtight. An inlet 5 is formed in the inlet member 1, a valve chamber 6 is formed between the inlet member 1 and the outlet member 2, and an outlet 7 and a large valve hole 8 having a large passage area are formed in the outlet member 2. The inlet 5 communicates with the upper part of the valve chamber 6. The lower part of the valve chamber 6 communicates with the lower outlet 7 through the large valve hole 8.
[0008]
A bimetal 9 as a temperature responsive member is disposed in the valve chamber 6. The bimetal 9 has a substantially U-shaped cross section and one end is fixed to the outlet member 2 with screws 10, and the other end is fixed to the valve member 12 with screws 11. The bimetal 9 is deformed so as to narrow the U-shape at a high temperature and closes the large valve hole 8 with the valve member 12, and is deformed so as to expand the U-shape at a low temperature and opens the large valve hole 8 at the valve member 12.
[0009]
A valve hole 13 having a smaller passage area than the large valve hole 8 is formed in the valve member 12. A hollow spherical float 14 for opening and closing the valve hole 13 is disposed in the valve chamber 6 in a free state. Two float seats 15 are provided below the float 14 and contact the float 14 at the position where the valve hole 13 is closed, on the side facing the near side of the drawing.
[0010]
The operation of the free-float type steam trap of the above embodiment is as follows. When a large amount of low-temperature air and condensate flow into the valve chamber 6 as in the initial startup of the steam piping system, the bimetal 9 is deformed so as to expand in a U-shape, and the large valve hole 8 is formed in the valve member 12. Is opened, and a large amount of low-temperature air and condensate are quickly discharged from the large valve hole 8 to the outlet 7.
[0011]
When the temperature of the condensate flowing into the valve chamber 6 increases due to the discharge of the low-temperature air and the condensate, the bimetal 9 is deformed so as to narrow the U-shape, and the large valve hole 8 is closed by the valve member 12. The float 14 floats and descends in accordance with the amount of condensed water in the valve chamber 6, opens and closes the valve hole 13, and discharges condensed water from the valve hole 12 to the outlet 7 through the large valve hole 8. When the air flows into the valve chamber 6 and the temperature in the valve chamber 6 drops below a predetermined level, the bimetal 9 is deformed so as to expand its U-shape, and the large valve hole 8 is opened by the valve member 12 to increase the air. It is quickly discharged from the valve hole 8 to the outlet 7.
[0012]
If the temperature in the valve chamber 6 drops below a predetermined value during the stoppage of the air supply to the piping system, the bimetal 9 is deformed so as to expand the U-shape, the large valve hole 8 is opened by the valve member 12, and the low temperature recovery is performed. Water is discharged from the large valve hole 8 to the outlet 6.
[0013]
In the above embodiment, the present invention is applied to a free-float type steam trap, but can also be applied to a lever-float type steam trap.
[0014]
【The invention's effect】
The present invention has the following specific effects.
According to the present invention as described above, by opening a large valve hole having a large passage area formed at the lower end of the valve chamber at a low temperature, a large amount of low-temperature air can be quickly discharged from the large valve hole, and at the time of rest, the large valve hole is opened. This produces an excellent effect that low-temperature condensate can be discharged from the tank.
[Brief description of the drawings]
FIG. 1 is a sectional view of an embodiment in which a float type steam trap of the present invention is applied to a free float type steam trap.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inlet side member 2 Outlet side member 5 Inlet 6 Valve room 7 Outlet 8 Large valve hole 9 Bimetal 12 Valve member 13 Valve hole 14 Float
