JP4115821B2 - Thermally responsive steam trap - Google Patents

Thermally responsive steam trap Download PDF

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Publication number
JP4115821B2
JP4115821B2 JP2002362024A JP2002362024A JP4115821B2 JP 4115821 B2 JP4115821 B2 JP 4115821B2 JP 2002362024 A JP2002362024 A JP 2002362024A JP 2002362024 A JP2002362024 A JP 2002362024A JP 4115821 B2 JP4115821 B2 JP 4115821B2
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Japan
Prior art keywords
wall
valve
diaphragm
outlet
diaphragm member
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Expired - Fee Related
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JP2002362024A
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Japanese (ja)
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JP2004190823A (en
Inventor
剛士 福田
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Tlv Co Ltd
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Tlv Co Ltd
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Priority to JP2002362024A priority Critical patent/JP4115821B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は、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スチームトラップに関し、特に、加熱されて膨脹し冷却されて収縮する媒体を含む温度制御機素を用いて、所望温度以下の流体を系外へ排出する熱応動式スチームトラップに関するものである。
【0002】
【従来の技術】
【特許文献1】
特許第3355388号
温度制御機素を用いた熱応動式スチームトラップは、例えば特許第3355388号に示されている。当該公報から理解されるように、弁ケーシングで入口と弁室と出口を形成し、導出路を有する弁座部材を弁室と出口との間に配置し、上下二つの壁部材と、両壁部材の間に外周縁を固着したダイヤフラム部材と、上壁部材とダイヤフラム部材との間に密封した膨脹媒体と、ダイヤフラム部材に連結した弁部材とから成る温度制御機素を弁室内に配置し、膨脹媒体の膨張収縮によるダイヤフラム部材の変位によって弁部材を駆動して導出路を開閉するものである。膨脹媒体は、水よりも沸点の低いプロパノール等のアルコールと水との混合物で形成される。
【0003】
弁室内に所定温度以上の高温流体が流入してくると、膨脹媒体が膨脹してダイヤフラム部材を入口側の流体圧力に抗して弁座部材方向に変位させる。これによって、弁部材が導出路を閉止して蒸気の排出を防止する。所定温度以下の低温流体が流入してくると、膨脹媒体が収縮してダイヤフラム部材を入口側の流体圧力によって開弁方向に変位させる。これによって、弁部材が導出路を開口して復水や空気を系外へ排出する。
【0004】
【発明が解決しようとする課題】
上記従来技術のものでは、ダイヤフラム部材が破損すると膨張媒体が温度制御機素から漏出してしまう。そのため、食品や医療等の分野で用いられる場合には重大な事故に繋がる問題点があった。従って、本発明の技術的課題は、ダイヤフラム部材が破損しても膨張媒体が温度制御機素から漏出することのない熱応動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、弁ケーシングで入口と弁室と出口を形成し、導出路を有する弁座部材を弁室と出口との間に配置し、上下二つの壁部材と、両壁部材の間に外周縁を固着したダイヤフラム部材と、上壁部材とダイヤフラム部材との間に密封した膨脹媒体と、ダイヤフラム部材に連結した弁部材とから成る温度制御機素を弁室内に配置し、膨脹媒体の膨張収縮によるダイヤフラム部材の変位によって弁部材を駆動して導出路を開閉するものにおいて、外周壁が下壁部材の内周壁を内壁壁が弁部材の外周壁を気密的に摺動するピストン部材を設けてダイヤフラム部材とピストン部材との間に密閉空間を形成したことを特徴とする熱応動式スチームトラップにある。
【0006】
【発明の実施の形態】
本発明の熱応動式スチームトラップは、外周壁が下壁部材の内周壁を内壁壁が弁部材の外周壁を気密的に摺動するピストン部材を設けてダイヤフラム部材とピストン部材との間に密閉空間を形成したものである。そのため、ダイヤフラム部材が破損すると膨張媒体が密閉空間に流入し温度制御機素から漏出することがない。
【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には同一軸上に入口2と出口3が形成され、この入口2及び出口3と連通する弁室4が本体1にねじ結合された蓋部材5によって形成される。出口3の弁室4側開口端に、弁室4と出口3とを連通する導出路6が形成された弁座部材7がねじ結合されている。
【0008】
弁座部材7の上方に、温度制御機素8が配置される。温度制御機素8は、注入口9を有する上壁部材10と、注入口9を密封する栓部材11と、上壁部材10との間に膨脹媒体14を密封するダイヤフラム部材13と、ダイヤフラム部材13に固着され弁座部材7に離着座して導出路6を開閉する弁部材15と、ダイヤフラム部材13の外周縁を上壁部材10との間に挟んで固着する下壁部材16と、外周壁が下壁部材16の内周壁を内壁壁が弁部材15の外周壁を気密的に摺動するピストン部材17と、ダイヤフラム部材13とピストン部材17との間の密閉空間12から形成される。膨脹媒体14は、水よりも沸点の低いプロパノール等のアルコールと水との混合物で形成される。
【0009】
温度制御機素8は、本体1と弁座部材7との間に挟んで固定された有底円筒形状の取付部材18内に収容され、一端を蓋部材5に固定し他端を温度制御機素8に固定したコイルスプリング19の付勢力によって取付部材18の段部20に下壁部材16の下面が当接保持される。コイルスプリング18は一端のコイル径が蓋部材5の内径よりも大きく形成され、一端を蓋部材5の内壁に嵌め込むことにより固定され、他端のコイル径が栓部材11の直径よりも小さく形成され、他端を栓部材11に嵌め込むことにより固定される。取付部材18には、底壁に流体通過孔21と周壁に3つの流体通過窓22が開けられている。
【0010】
本実施例での作動は下記の通りである。
始動時、弁室4内は低温であり、膨脹媒体14は収縮し、入口側の流体圧力によってピストン部材17とダイヤフラム部材13が上方に変位し、弁部材15が弁座部材7から離座して導出路6を開口している。これによって入口2から流入する低温の復水や空気を導出路6から出口3へ排出する。低温流体の排出によって入口2から流入する流体温度が上昇し、弁室4内が所定温度以上になると、膨脹媒体14は膨脹し、入口側の流体圧力に抗してピストン部材17とダイヤフラム部材13が下方に変位し、弁部材15が弁座部材7に着座して導出路6を閉止する。これによって蒸気の漏出を防止する。放熱によって弁室4内が所定温度以下になると、膨脹媒体14は収縮し、入口側の流体圧力によってピストン部材17とダイヤフラム部材13が上方に変位し、弁部材15が弁座部材7から離座して導出路6を開口する。
【0011】
ダイヤフラム部材13が破損すると膨張媒体14が密閉空間12に流入し温度制御機素8から漏出することがない。
【0012】
【発明の効果】
上記のように本発明は、外周壁が下壁部材の内周壁を内壁壁が弁部材の外周壁を気密的に摺動するピストン部材を設けてダイヤフラム部材とピストン部材との間に密閉空間を形成することにより、ダイヤフラム部材が破損しても膨張媒体が温度制御機素から漏出することがないという優れた効果を生じる。
【図面の簡単な説明】
【図1】本発明の実施例の熱応動式スチームトラップの断面図。
【符号の説明】
1 本体
2 入口
3 出口
4 弁室
5 蓋部材
6 導出路
7 弁座部材
8 温度制御機素
10 上壁部材
13 ダイヤフラム部材
14 膨張媒体
15 弁部材
16 下壁部材
17 ピストン部材
18 取付部材
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steam trap that automatically discharges condensate generated in various steam-using devices and steam pipes, and in particular, by using a temperature control element including a medium that is heated, expanded, cooled, and contracted. The present invention relates to a thermally responsive steam trap that discharges a fluid having a temperature below the system.
[0002]
[Prior art]
[Patent Document 1]
Japanese Patent No. 3355388 A thermally responsive steam trap using a temperature control element is disclosed in, for example, Japanese Patent No. 3355388. As understood from the publication, the valve casing forms an inlet, a valve chamber, and an outlet, a valve seat member having a lead-out path is disposed between the valve chamber and the outlet, two upper and lower wall members, and both walls A temperature control element comprising a diaphragm member having an outer peripheral edge fixed between the members, an expansion medium sealed between the upper wall member and the diaphragm member, and a valve member connected to the diaphragm member is disposed in the valve chamber, The valve member is driven by the displacement of the diaphragm member due to the expansion and contraction of the expansion medium to open and close the lead-out path. The expansion medium is formed from a mixture of an alcohol such as propanol having a boiling point lower than that of water and water.
[0003]
When a high-temperature fluid having a predetermined temperature or more flows into the valve chamber, the expansion medium expands and displaces the diaphragm member toward the valve seat member against the fluid pressure on the inlet side. As a result, the valve member closes the outlet passage to prevent the steam from being discharged. When a low-temperature fluid having a predetermined temperature or less flows in, the expansion medium contracts and the diaphragm member is displaced in the valve opening direction by the fluid pressure on the inlet side. As a result, the valve member opens the outlet passage and discharges condensate and air out of the system.
[0004]
[Problems to be solved by the invention]
In the above prior art, if the diaphragm member is damaged, the expansion medium leaks from the temperature control element. Therefore, when used in fields such as food and medical care, there is a problem that leads to a serious accident. Therefore, the technical problem of the present invention is to provide a thermally responsive steam trap in which the expansion medium does not leak from the temperature control element even if the diaphragm member is damaged.
[0005]
[Means for Solving the Problems]
The technical means of the present invention taken in order to solve the above technical problem is that a valve casing forms an inlet, a valve chamber, and an outlet, and a valve seat member having a lead-out path is disposed between the valve chamber and the outlet. And an upper and lower wall members, a diaphragm member having an outer peripheral edge fixed between both wall members, an expansion medium sealed between the upper wall member and the diaphragm member, and a valve member connected to the diaphragm member. The temperature control element is arranged in the valve chamber, and the outlet member is opened and closed by driving the valve member by the displacement of the diaphragm member due to expansion and contraction of the expansion medium. The outer peripheral wall is the inner peripheral wall of the lower wall member, and the inner wall wall is the valve. The heat-responsive steam trap is characterized in that a piston member that airtightly slides on the outer peripheral wall of the member is provided to form a sealed space between the diaphragm member and the piston member.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The thermally responsive steam trap of the present invention is provided with a piston member in which the outer peripheral wall slides airtightly on the inner peripheral wall of the lower wall member, and the inner wall wall seals between the diaphragm member and the piston member. A space is formed. Therefore, when the diaphragm member is damaged, the expansion medium does not flow into the sealed space and leak from the temperature control element.
[0007]
【Example】
An embodiment showing a specific example of the above technical means will be described (see FIG. 1). An inlet 2 and an outlet 3 are formed on the same axis on the main body 1, and a valve chamber 4 communicating with the inlet 2 and the outlet 3 is formed by a lid member 5 screwed to the main body 1. A valve seat member 7 in which a lead-out passage 6 for communicating the valve chamber 4 and the outlet 3 is formed is screwed to the opening end of the outlet 3 on the valve chamber 4 side.
[0008]
A temperature control element 8 is disposed above the valve seat member 7. The temperature control element 8 includes an upper wall member 10 having an inlet 9, a plug member 11 that seals the inlet 9, a diaphragm member 13 that seals an expansion medium 14 between the upper wall member 10, and a diaphragm member 13, a valve member 15 that is fixedly attached to the valve seat member 7 and opens and closes the outlet path 6, a lower wall member 16 that is fixed with the outer peripheral edge of the diaphragm member 13 sandwiched between the upper wall member 10, and an outer periphery The wall is formed by a piston member 17 that airtightly slides on the inner peripheral wall of the lower wall member 16 and the inner wall wall on the outer peripheral wall of the valve member 15, and a sealed space 12 between the diaphragm member 13 and the piston member 17. The expansion medium 14 is formed of a mixture of an alcohol such as propanol having a boiling point lower than that of water and water.
[0009]
The temperature control element 8 is accommodated in a bottomed cylindrical mounting member 18 fixed between the main body 1 and the valve seat member 7, one end is fixed to the lid member 5, and the other end is a temperature controller. The lower surface of the lower wall member 16 is held in contact with the step portion 20 of the mounting member 18 by the urging force of the coil spring 19 fixed to the element 8. The coil spring 18 is formed such that the coil diameter at one end is larger than the inner diameter of the lid member 5, is fixed by fitting one end into the inner wall of the lid member 5, and the coil diameter at the other end is smaller than the diameter of the plug member 11. The other end is fixed by fitting into the plug member 11. The attachment member 18 has a fluid passage hole 21 in the bottom wall and three fluid passage windows 22 in the peripheral wall.
[0010]
The operation in this embodiment is as follows.
At the time of starting, the temperature in the valve chamber 4 is low, the expansion medium 14 contracts, the piston member 17 and the diaphragm member 13 are displaced upward by the fluid pressure on the inlet side, and the valve member 15 is separated from the valve seat member 7. The lead-out path 6 is opened. As a result, low-temperature condensate or air flowing in from the inlet 2 is discharged from the outlet path 6 to the outlet 3. When the temperature of the fluid flowing in from the inlet 2 rises due to the discharge of the low-temperature fluid and the inside of the valve chamber 4 reaches a predetermined temperature or more, the expansion medium 14 expands, and the piston member 17 and the diaphragm member 13 resist the fluid pressure on the inlet side. Is displaced downward, the valve member 15 is seated on the valve seat member 7 and the outlet path 6 is closed. This prevents steam leakage. When the inside of the valve chamber 4 falls below a predetermined temperature due to heat radiation, the expansion medium 14 contracts, the piston member 17 and the diaphragm member 13 are displaced upward by the fluid pressure on the inlet side, and the valve member 15 is separated from the valve seat member 7. Thus, the outlet path 6 is opened.
[0011]
When the diaphragm member 13 is damaged, the expansion medium 14 does not flow into the sealed space 12 and leak from the temperature control element 8.
[0012]
【The invention's effect】
As described above, the present invention provides a piston member in which the outer peripheral wall slides airtightly on the inner peripheral wall of the lower wall member and the inner wall wall airtightly slides on the outer peripheral wall of the valve member, thereby providing a sealed space between the diaphragm member and the piston member. By forming, an excellent effect is obtained that the expansion medium does not leak from the temperature control element even if the diaphragm member is damaged.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a thermally responsive steam trap according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body 2 Inlet 3 Outlet 4 Valve chamber 5 Lid member 6 Outlet path 7 Valve seat member 8 Temperature control element 10 Upper wall member 13 Diaphragm member 14 Expansion medium 15 Valve member 16 Lower wall member 17 Piston member 18 Attachment member

Claims (1)

弁ケーシングで入口と弁室と出口を形成し、導出路を有する弁座部材を弁室と出口との間に配置し、上下二つの壁部材と、両壁部材の間に外周縁を固着したダイヤフラム部材と、上壁部材とダイヤフラム部材との間に密封した膨脹媒体と、ダイヤフラム部材に連結した弁部材とから成る温度制御機素を弁室内に配置し、膨脹媒体の膨張収縮によるダイヤフラム部材の変位によって弁部材を駆動して導出路を開閉するものにおいて、外周壁が下壁部材の内周壁を内壁壁が弁部材の外周壁を気密的に摺動するピストン部材を設けてダイヤフラム部材とピストン部材との間に密閉空間を形成したことを特徴とする熱応動式スチームトラップ。The valve casing forms an inlet, a valve chamber, and an outlet. A valve seat member having a lead-out path is disposed between the valve chamber and the outlet, and the outer peripheral edge is fixed between the upper and lower wall members and the both wall members. A temperature control element comprising a diaphragm member, an expansion medium sealed between the upper wall member and the diaphragm member, and a valve member connected to the diaphragm member is disposed in the valve chamber, and the diaphragm member is formed by expansion and contraction of the expansion medium. A valve member is driven by displacement to open and close the lead-out path. A diaphragm member and a piston are provided by providing a piston member in which the outer peripheral wall slides airtightly on the inner peripheral wall of the lower wall member and the inner wall wall airtightly slides on the outer peripheral wall of the valve member. A thermally responsive steam trap, characterized in that a sealed space is formed between the members.
JP2002362024A 2002-12-13 2002-12-13 Thermally responsive steam trap Expired - Fee Related JP4115821B2 (en)

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