JPH06221453A - Thermal safety valve and gas pump provided with above valve - Google Patents
Thermal safety valve and gas pump provided with above valveInfo
- Publication number
- JPH06221453A JPH06221453A JP1205993A JP1205993A JPH06221453A JP H06221453 A JPH06221453 A JP H06221453A JP 1205993 A JP1205993 A JP 1205993A JP 1205993 A JP1205993 A JP 1205993A JP H06221453 A JPH06221453 A JP H06221453A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- temperature
- gas
- shape memory
- memory alloy
- 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
- Safety Valves (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Temperature-Responsive Valves (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、熱で作動する熱動形
安全弁に関し、またこの熱動形安全弁を、例えば渦流送
風機や容積形圧縮機などの小風量で高圧力の気体ポンプ
に使用するものに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-operated thermal safety valve, and this thermal safety valve is used in a gas pump of small air flow and high pressure such as a vortex blower or a positive displacement compressor. Regarding things.
【０００２】[0002]
【従来の技術】図４は一般的な渦流送風機の特性曲線図
である。図において、横軸に流量Ｑ、立軸に吐出圧力Ｐ
S 、吐出空気温度上昇ｔ及び駆動電動機の負荷電流ｉを
示す。Ｑが減少するにつれてＰS は増加、ｉは微増する
が、ｔは急増する。このため、小風量では渦流送風機の
軸封装置や軸受やその潤滑グリースの温度が急上昇して
寿命が短くなり渦流送風機の破損につながる。電動機に
サーマルリレーを取付けてもｉの変化が少ないので前記
の温度上昇の保護機能を果たさない。このため、Ｑ−Ｐ
S 曲線上に使用許容点Ｐを定め、これ以上のＱ又はこれ
以下のＰS で使用するようにしているが、フィルターの
目詰まりなど不確実な事態のため、前記使用許容点Ｐよ
りＱが減少して渦流送風機の破損が起きる。容積形圧縮
機でも、Ｑが減少するにつれてＰS が急増するという違
いがあるが、使用許容点ＰよりＰSが増加すれば、軸封
装置や軸受やその潤滑グリースに起因して圧縮機の破損
が起きる。小風量における気体ポンプのこのような事情
を避けるため、次の方法がある。2. Description of the Related Art FIG. 4 is a characteristic curve diagram of a general vortex blower. In the figure, the horizontal axis is the flow rate Q and the vertical axis is the discharge pressure P.
S , discharge air temperature rise t, and load current i of the drive motor are shown. As Q decreases, P S increases, i slightly increases, but t rapidly increases. Therefore, even with a small amount of air, the temperature of the shaft seal device of the vortex blower, the bearing, and the lubricating grease therefor rises rapidly, shortening the life of the vortex blower, which leads to damage of the vortex blower. Even if a thermal relay is attached to the electric motor, since the change of i is small, it does not fulfill the above-mentioned temperature rise protection function. Therefore, QP
The allowable use point P is set on the S curve, and it is used at a Q higher than this value or at a P S lower than this. However, due to uncertain circumstances such as clogging of the filter, Decrease and damage to the vortex blower occurs. Even in a positive displacement compressor, there is a difference that P S increases sharply as Q decreases. However, if P S increases from the allowable use point P, the compressor of the compressor may be caused by the shaft seal device, the bearing, or the lubricating grease. Damage occurs. In order to avoid such a situation of the gas pump at a small air volume, there are the following methods.
【０００３】図３は圧力側管路を備える従来例の渦流送
風機の正面図である。図において、電動機２で駆動され
る渦流送風機１の図示しない負荷を持つ圧力側の管路３
にバイパス孔４を設け、仮令使用風量Ｑ2 が減少しても
バイパス孔４からの風量Ｑ1との和の風量Ｑが前記使用
許容点Ｐの風量Ｑより少なくならないようにする。また
バイパス孔４に代わり又は併用して圧力で作動するいわ
ゆる圧動形安全弁５を使用することもある。FIG. 3 is a front view of a conventional vortex blower having a pressure side pipe line. In the figure, a pressure side pipe line 3 having a load (not shown) of a vortex blower 1 driven by an electric motor 2
A bypass hole 4 is provided in the air passage so that the sum of the air volume Q 1 from the bypass hole 4 and the air volume Q 1 from the bypass hole 4 does not become smaller than the air volume Q at the use allowable point P even if the provisional usage air volume Q 2 decreases. Further, a so-called pressure-operated safety valve 5 which operates by pressure may be used instead of or in combination with the bypass hole 4.
【０００４】[0004]
【発明が解決しようとする課題】前記の従来例におい
て、バイパス孔４を設けるものは、使用風量Ｑ2 が充分
に大きい状態でもバイパス孔４からの常時の漏れ風量が
ありエネルギ損失となる。また圧動形安全弁５を使用す
るものは、取扱い気体の温度や周囲温度が規定値より高
い場合には、渦流送風機の軸封装置や軸受やその潤滑グ
リースの温度が予定より高くなって寿命が短くなり渦流
送風機の破損が早くなる。逆に前記温度が低い場合に
は、渦流送風機の小風量で圧力が高いという性質を充分
に利用しないことになる。In the conventional example described above, in which the bypass hole 4 is provided, even if the used air volume Q 2 is sufficiently large, there is a constant leakage air volume from the bypass hole 4, resulting in energy loss. When the pressure-operated safety valve 5 is used, if the temperature of the handled gas or the ambient temperature is higher than the specified value, the temperature of the shaft sealing device or bearing of the vortex blower or its lubricating grease will be higher than expected and the life will be shortened. It shortens and damages the vortex blower faster. On the contrary, when the temperature is low, the property of the swirl blower that the air volume is small and the pressure is high is not fully utilized.
【０００５】この発明の目的は、常時の漏れ風量のエネ
ルギ損失が無く、軸封装置や潤滑グリースなどの温度限
界に確実に対応して小風量で高圧力の動作点まで使用で
きる熱動形安全弁及びこれを備える気体ポンプを提供す
ることにある。The object of the present invention is to provide a thermal safety valve which can be used up to an operating point with a small air volume and a high pressure without failing to constantly deal with energy loss due to the leakage air volume and to surely cope with the temperature limit of a shaft sealing device or lubricating grease. And to provide a gas pump including the same.
【０００６】[0006]
【課題を解決するための手段】発明１の熱動形安全弁
は、管路に連通する弁体と、この弁体の弁座に気密に取
付けられ中央部に開動可能なスリットを持ち任意の指定
温度で開動する形状記憶合金からなる板状の弁と、この
弁の反管路側の弁体を大気に開放する開口とからなるも
のである。The heat-operated safety valve according to the first aspect of the present invention has a valve body communicating with a pipe line, an airtightly mounted slit on the valve seat of the valve body, and a slit that can be opened in the central portion. It is composed of a plate-shaped valve made of a shape memory alloy that opens at a temperature, and an opening that opens the valve body on the side opposite to the conduit of the valve to the atmosphere.
【０００７】発明２の熱動形安全弁は、管路に連通する
弁体と、この弁体の弁座に開動可能に配置される弁と、
この弁の管路側を押圧し任意の指定温度で伸びる形状記
憶合金からなるコイルばねと、前記弁の反管路側を押圧
するコイルばねと、前記弁の反管路側の弁体を大気に開
放する開口とからなるものである。発明３の熱動形安全
弁を備える気体ポンプは、発明１又は発明２の熱動形安
全弁を気体ポンプの圧力側の管路に接続するものであ
る。A heat-operated safety valve according to a second aspect of the present invention comprises a valve body communicating with a pipe line, and a valve movably arranged on a valve seat of the valve body.
A coil spring made of a shape memory alloy that presses the conduit side of the valve and extends at an arbitrary specified temperature, a coil spring that presses the non-conduit side of the valve, and a valve body on the anti-conduit side of the valve is opened to the atmosphere. And an opening. A gas pump provided with a heat-operated safety valve according to a third aspect of the invention is one in which the heat-operated safety valve according to the first or second aspect of the invention is connected to a pipeline on the pressure side of the gas pump.
【０００８】[0008]
【作用】発明１又は２によれば、管路を流れる気体の温
度を受け、形状記憶合金からなる弁又はコイルばねが指
定温度になると、弁は開動して気体を開口から放出す
る。このため、管路の上流の流量は下流の流量より多く
なる。発明３によれば、管路を流れる気体の温度を受
け、形状記憶合金からなる弁又はコイルばねが指定温度
になると、弁は開動して気体を開口から放出する。この
ため、管路の上流の流量は下流の流量より多くなる。形
状記憶合金の指定温度を気体ポンプの軸封装置や潤滑グ
リースなどの温度限界に対応して定めておけば、負荷の
流体抵抗が増減するようなことがあっても、弁の温度が
限界温度を越える時のみ弁が開動して軸封装置や潤滑グ
リースなどを熱的に確実に保護する。According to the first or second aspect of the invention, when the temperature of the gas flowing through the pipeline is received and the valve or the coil spring made of the shape memory alloy reaches the specified temperature, the valve opens to release the gas from the opening. Therefore, the flow rate on the upstream side of the pipeline becomes higher than the flow rate on the downstream side. According to the third aspect of the invention, when the temperature of the gas flowing through the pipe line is received and the valve or the coil spring made of the shape memory alloy reaches the specified temperature, the valve opens to release the gas from the opening. Therefore, the flow rate on the upstream side of the pipeline becomes higher than the flow rate on the downstream side. If the specified temperature of the shape memory alloy is set according to the temperature limit of the gas pump shaft seal device and lubricating grease, the valve temperature will reach the limit temperature even if the fluid resistance of the load may increase or decrease. Only when the temperature exceeds, the valve opens to protect the shaft seal device and lubricating grease from heat.
【０００９】[0009]
【実施例】図１は実施例１の熱動形安全弁の断面図、図
２は実施例２の熱動形安全弁の断面図である。図１にお
いて、気体ポンプの圧力側の管路３に連通する弁体１１
の弁座１２に板状の弁１３が取付具１４で気密に取付け
られる。弁１３は中央部に開動可能なように十字状のス
リット１３ａを持ち任意の指定温度で開動するように形
状記憶合金からなる。弁１３の反管路３側の弁体１１は
大気に開放する開口１５を持つ。管路３を流れる気体の
温度を受け、形状記憶合金からなる弁１３が前記指定温
度になると、弁１３は図の鎖線で示すように開動して気
体Ｑ1 を放出する。なおスリット１３ａは複数の径方向
スリットやコ字状、Ｕ字状、Ｖ字状など様々な開動可能
な形状が使用できる。FIG. 1 is a sectional view of a heat-operated safety valve of the first embodiment, and FIG. 2 is a sectional view of a heat-operated safety valve of the second embodiment. In FIG. 1, a valve body 11 communicating with the pressure-side pipe line 3 of the gas pump.
A plate-shaped valve 13 is airtightly attached to the valve seat 12 by a fitting 14. The valve 13 has a cross-shaped slit 13a that can be opened in the central portion and is made of a shape memory alloy so that it can be opened at any specified temperature. The valve body 11 on the side opposite to the conduit 3 of the valve 13 has an opening 15 that opens to the atmosphere. When the valve 13 made of a shape memory alloy reaches the specified temperature due to the temperature of the gas flowing through the pipe 3, the valve 13 opens to release the gas Q 1 as shown by the chain line in the figure. It should be noted that the slits 13a can use a plurality of radial slits and various openable shapes such as a U-shape, a U-shape, and a V-shape.
【００１０】この実施例によれば、弁１３が開動すれ
ば、管路３の上流の流量Ｑは下流の流量Ｑ2 より多くな
る。形状記憶合金の前記指定温度を気体ポンプの軸封装
置や潤滑グリースなどの温度限界に対応して定めておけ
ば、負荷の流体抵抗が増減するようなことがあっても、
弁１３の温度が前記限界温度を越える時のみ弁１３が開
動して軸封装置や潤滑グリースなどを熱的に確実に保護
する。もっとも軸封装置や潤滑グリースなどの温度より
弁１３の温度が低いので、その分、形状記憶合金の前記
指定温度を低く設定する。According to this embodiment, when the valve 13 is opened, the flow rate Q upstream of the pipe 3 becomes larger than the flow rate Q 2 downstream. If the specified temperature of the shape memory alloy is determined according to the temperature limit of the shaft sealing device of the gas pump or lubricating grease, even if the fluid resistance of the load may increase or decrease,
Only when the temperature of the valve 13 exceeds the above-mentioned limit temperature, the valve 13 is opened, and the shaft sealing device, the lubricating grease, etc. are thermally and reliably protected. However, since the temperature of the valve 13 is lower than the temperature of the shaft sealing device and the lubricating grease, the specified temperature of the shape memory alloy is set lower by that amount.
【００１１】図２に示す実施例２において、気体ポンプ
の圧力側の管路３に連通する弁体２１の弁座２２に開動
可能に弁２３が配置される。弁２３の管路３側を押圧し
任意の指定温度で伸びる形状記憶合金からなるコイルば
ね２４と、弁２３の反管路３側を押圧する普通の材料か
らなるコイルばね２５とが配置される。弁２３の反管路
３側の弁体２１は大気に開放する開口２６を持ち、コイ
ルばね２５はふた２７に支持されるねじ２８で押圧力を
調整できる。管路３を流れる気体の温度を受け、形状記
憶合金からなるコイルばね２４が指定温度になると、弁
２３はコイルばね２５に対抗して開動し、気体Ｑ1 を放
出する。In the second embodiment shown in FIG. 2, a valve 23 is arranged movably on a valve seat 22 of a valve body 21 which communicates with the pressure side pipe line 3 of the gas pump. A coil spring 24 made of a shape memory alloy that presses the pipe line 3 side of the valve 23 and extends at an arbitrary designated temperature, and a coil spring 25 made of a normal material that presses the non-pipe line 3 side of the valve 23 are arranged. . The valve body 21 on the side opposite to the conduit 3 of the valve 23 has an opening 26 that opens to the atmosphere, and the coil spring 25 can adjust the pressing force with a screw 28 supported by a lid 27. When the coil spring 24 made of a shape memory alloy reaches the specified temperature due to the temperature of the gas flowing through the pipe line 3, the valve 23 opens against the coil spring 25 and releases the gas Q 1 .
【００１２】この実施例によれば、実施例１と同様に、
軸封装置や潤滑グリースなどを熱的に確実に保護する。
コイルばね２５の押圧力をねじ２８で調整すればＱ1 を
調整できる。According to this embodiment, as in the first embodiment,
Protects the shaft seal device and lubricating grease from heat.
Q 1 can be adjusted by adjusting the pressing force of the coil spring 25 with the screw 28.
【００１３】[0013]
【発明の効果】この発明によれば、管路を流れる気体の
温度を受け、形状記憶合金からなる弁又はコイルばねが
指定温度になると、弁は開動して気体を開口から放出す
る。このため、管路の上流の流量は下流の流量より多く
なる。そして形状記憶合金の指定温度を気体ポンプの軸
封装置や潤滑グリースなどの温度限界に対応して定めれ
ば、負荷の流体抵抗が増減しても、弁の温度が前記限界
温度を越える時のみ弁が開動して軸封装置や潤滑グリー
スなどを熱的に確実に保護し、常時の漏れ風量のエネル
ギ損失が無いという効果がある。According to the present invention, when the temperature of the gas flowing through the pipe is received and the valve or the coil spring made of the shape memory alloy reaches the specified temperature, the valve opens to release the gas from the opening. Therefore, the flow rate on the upstream side of the pipeline becomes higher than the flow rate on the downstream side. And if the specified temperature of the shape memory alloy is determined according to the temperature limit of the shaft seal device of the gas pump and lubricating grease, even if the fluid resistance of the load increases or decreases, only when the valve temperature exceeds the above limit temperature. There is an effect that the valve opens to protect the shaft seal device and the lubricating grease thermally and reliably, and there is no energy loss due to the amount of leaked air at all times.
【図１】実施例１の熱動形安全弁の断面図FIG. 1 is a sectional view of a heat-operated safety valve according to a first embodiment.
【図２】実施例２の熱動形安全弁の断面図FIG. 2 is a sectional view of a heat-operated safety valve according to a second embodiment.
【図３】圧力側管路を備える従来例の渦流送風機の正面
図FIG. 3 is a front view of a conventional vortex blower including a pressure side pipe line.
【図４】一般的な渦流送風機の特性曲線図FIG. 4 is a characteristic curve diagram of a general vortex blower.
３ 管路 １１ 弁体 １２ 弁座 １３ 弁 １３ａ スリット １５ 開口 3 Pipeline 11 Valve body 12 Valve seat 13 Valve 13a Slit 15 Opening
Claims (3)
気密に取付けられ中央部に開動可能なスリットを持ち任
意の指定温度で開動する形状記憶合金からなる板状の弁
と、この弁の反管路側の弁体を大気に開放する開口とか
らなることを特徴とする熱動形安全弁。1. A plate-shaped valve made of a shape memory alloy that is airtightly mounted on a valve seat of the valve body and has a slit that can be opened in the central portion and that opens at an arbitrary specified temperature. And a heat-operated safety valve comprising an opening that opens the valve body of the valve on the side opposite to the pipeline to the atmosphere.
開動可能に配置される弁と、この弁の管路側を押圧し任
意の指定温度で伸びる形状記憶合金からなるコイルばね
と、前記弁の反管路側を押圧するコイルばねと、前記弁
の反管路側の弁体を大気に開放する開口とからなること
を特徴とする熱動形安全弁。2. A valve body communicating with a pipeline, a valve movably arranged on a valve seat of the valve body, and a coil made of a shape memory alloy that presses the pipeline side of the valve and extends at an arbitrary designated temperature. A heat-operated safety valve comprising a spring, a coil spring that presses the valve on the side opposite to the pipeline, and an opening that opens the valve body on the side of the valve opposite the pipeline to the atmosphere.
ポンプの圧力側の管路に接続することを特徴とする熱動
形安全弁を備える気体ポンプ。3. A gas pump having a heat-operated safety valve, wherein the heat-operated safety valve according to claim 1 or 2 is connected to a pressure line of the gas pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1205993A JPH06221453A (en) | 1993-01-28 | 1993-01-28 | Thermal safety valve and gas pump provided with above valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1205993A JPH06221453A (en) | 1993-01-28 | 1993-01-28 | Thermal safety valve and gas pump provided with above valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06221453A true JPH06221453A (en) | 1994-08-09 |
Family
ID=11795035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1205993A Pending JPH06221453A (en) | 1993-01-28 | 1993-01-28 | Thermal safety valve and gas pump provided with above valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06221453A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1002952C2 (en) * | 1996-04-25 | 1997-10-28 | Druk En Temperatuur Beveiligin | Temperature-dependent fluid flow regulator |
| CN108344142A (en) * | 2018-01-23 | 2018-07-31 | 浙江上风高科专风实业有限公司 | A kind of sector structure shock-wave resistant air vent valve |
-
1993
- 1993-01-28 JP JP1205993A patent/JPH06221453A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1002952C2 (en) * | 1996-04-25 | 1997-10-28 | Druk En Temperatuur Beveiligin | Temperature-dependent fluid flow regulator |
| CN108344142A (en) * | 2018-01-23 | 2018-07-31 | 浙江上风高科专风实业有限公司 | A kind of sector structure shock-wave resistant air vent valve |
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