JP3129472B2 - Liquefied gas supply abnormality detector for sterilization - Google Patents
Liquefied gas supply abnormality detector for sterilizationInfo
- Publication number
- JP3129472B2 JP3129472B2 JP03137803A JP13780391A JP3129472B2 JP 3129472 B2 JP3129472 B2 JP 3129472B2 JP 03137803 A JP03137803 A JP 03137803A JP 13780391 A JP13780391 A JP 13780391A JP 3129472 B2 JP3129472 B2 JP 3129472B2
- Authority
- JP
- Japan
- Prior art keywords
- liquefied gas
- temperature
- vaporizer
- sterilization
- pressure
- 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.)
- Expired - Fee Related
Links
Landscapes
- Apparatus For Disinfection Or Sterilisation (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は各種医療器具等の滅菌消
毒に用いられる酸化エチレンガス滅菌器のようなガス滅
菌器における滅菌用液化ガス供給異常検出装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting abnormal supply of liquefied gas for sterilization in a gas sterilizer such as an ethylene oxide gas sterilizer used for sterilizing various medical instruments.
【０００２】[0002]
【従来の技術】ガス滅菌器は、通常、滅菌用液化ガスボ
ンベから導いた液化ガスを電気ヒータ等で加熱される気
化器に通過させて気化させたのち、滅菌対象物を収容す
る滅菌チャンバへ送り込むように構成してある。このよ
うなガス滅菌器では、液化ガス供給が正常に行われない
と、滅菌チャンバ内のガス濃度が不十分となり、滅菌不
良という重大な事態が発生する。2. Description of the Related Art Generally, a gas sterilizer passes a liquefied gas introduced from a liquefied gas cylinder for sterilization through a vaporizer heated by an electric heater or the like to vaporize the liquefied gas, and then sends the gas to a sterilization chamber containing an object to be sterilized. It is configured as follows. In such a gas sterilizer, if the liquefied gas supply is not performed normally, the gas concentration in the sterilization chamber becomes insufficient, and a serious situation of sterilization failure occurs.
【０００３】そのため、液化ガスボンベ内の液化ガスの
有無の判断が必要になるが、その判断は、ボンベ内圧力
を圧力計で測定したり、ボンベを重量計に乗せてボンベ
重量を測定するといった方法で行われている。[0003] Therefore, it is necessary to determine the presence or absence of liquefied gas in the liquefied gas cylinder. The determination is made by measuring the pressure in the cylinder with a pressure gauge or measuring the weight of the cylinder by placing the cylinder on a weighing scale. It is done in.
【０００４】[0004]
【発明が解決しようとする課題】しかし、ボンベ内圧を
圧力計で測定する方法では、ボンベの周囲温度にボンベ
内圧が左右され、また、滅菌用液化ガスボンベは通常サ
イファン式ボンベであるため、液化ガスがもはや消費さ
れているときでも、なおガス圧が存在することがあり、
液化ガスの有無を正確に判断することができない。However, in the method of measuring the internal pressure of the cylinder with a pressure gauge, the internal pressure of the cylinder is affected by the ambient temperature of the cylinder, and the liquefied gas cylinder for sterilization is usually a sifan-type cylinder. Even when gas is no longer consumed, gas pressure may still exist,
The presence or absence of liquefied gas cannot be accurately determined.
【０００５】ボンベ重量を重量計で測定する方法は、液
化ガス有無を正確に判断できるが、重量計を必要とする
ので、それだけ嵩張り、重量計の設置スペースを準備し
なければならないという問題がある。また、ガス滅菌器
では、前記ガスボンベ中の液化ガスが空になった場合の
ほか、ガスボンベが接続されていない状態、接続されて
いるが、ボンベの元バルブが閉まったままの状態という
ような異常にも注意しなければならないが、これを簡単
に自動検出する手段は未だ見当たらない。The method of measuring the weight of a cylinder with a weighing scale can accurately determine the presence or absence of liquefied gas. However, since a weighing scale is required, there is a problem that it is bulky and a space for installing the weighing scale must be prepared. is there. In the gas sterilizer, abnormalities such as a state where the liquefied gas in the gas cylinder becomes empty, a state where the gas cylinder is not connected and a state where the gas cylinder is connected but the original valve of the cylinder remains closed. It should be noted, however, that there is no simple way to automatically detect this.
【０００６】そこで本発明は、滅菌用液化ガスボンベに
おける液化ガスの有無、該ボンベの未接続、該ボンベの
元バルブの未開等の各種滅菌用液化ガス供給異常を総合
的に正確に検出できる嵩張らない装置を低コストで提供
することを課題とする。Accordingly, the present invention is not bulky, and can collectively and accurately detect various sterilization liquefied gas supply abnormalities, such as presence or absence of liquefied gas in the liquefied gas cylinder for sterilization, disconnection of the cylinder, and opening of the original valve of the cylinder. It is an object to provide a device at low cost.
【０００７】[0007]
【課題を解決するための手段】本発明は前記課題を解決
するため、滅菌用液化ガスボンベから導いた液化ガスを
加熱手段で加熱される気化器に通過させて気化させたの
ち滅菌チャンバへ送り込むガス滅菌器における滅菌用液
化ガス供給異常検出装置であって、前記気化器の温度変
化を検出できる位置に設けた温度検出手段と、前記気化
器へ液化ガスを通すための操作を開始してから予め定め
た時間の経過後、前記温度検出手段にて検出される温度
が予め定めた異常判定温度より高いときに液化ガス供給
異常信号を出力する手段とを備えたことを特徴とする装
置（第１発明）を提供するものである。In order to solve the above-mentioned problems, the present invention provides a gas which passes a liquefied gas introduced from a liquefied gas cylinder for sterilization through a vaporizer heated by a heating means, vaporizes the liquefied gas, and sends the vaporized gas to a sterilization chamber. A device for detecting a liquefied gas supply abnormality for sterilization in a sterilizer, wherein a temperature detecting means provided at a position where a temperature change of the vaporizer can be detected, and an operation for passing the liquefied gas to the vaporizer is started beforehand. Means for outputting a liquefied gas supply abnormality signal when a temperature detected by the temperature detection means is higher than a predetermined abnormality determination temperature after a predetermined time has elapsed. Invention).
【０００８】液化ガスの正常な供給があれば当然滅菌チ
ャンバ内のガス圧力も上昇することを考慮して、より安
全を期するため、前記滅菌チャンバ内圧を検出する圧力
検出手段を付加し、前記液化ガス供給異常信号の出力手
段に代えて、前記気化器へ液化ガスを通すための操作を
開始してから予め定めた時間の経過後、前記温度検出手
段にて検出される温度が予め定めた異常判定温度以下
で、且つ、前記圧力検出手段にて検出される圧力が予め
定めた圧力以上の両条件を満足しないときに、液化ガス
供給異常信号を出力する手段を設ける（第２発明）こと
も考えられる。In consideration of the fact that the gas pressure in the sterilization chamber rises as long as the liquefied gas is normally supplied, a pressure detecting means for detecting the internal pressure of the sterilization chamber is added for safety. In place of the output means for the liquefied gas supply abnormality signal, after a lapse of a predetermined time from the start of the operation for passing the liquefied gas to the vaporizer, the temperature detected by the temperature detection means is predetermined. A means for outputting a liquefied gas supply abnormality signal when the pressure detected by the pressure detection means does not satisfy both conditions of not less than an abnormality determination temperature and not less than a predetermined pressure (second invention) Is also conceivable.
【０００９】いずれの場合においても、前記「予め定め
られる時間」及び「異常判定温度」は、例えば液化ガス
を正常に気化器へ流し始めてからの時間経過と温度降下
の関係を実験で調べておいて定めればよい。In any case, the "predetermined time" and the "abnormality determination temperature" are obtained, for example, by experimentally examining the relationship between the time elapsed since the liquefied gas started flowing normally to the vaporizer and the temperature drop. May be determined.
【００１０】[0010]
【作用】この第１発明の装置によると、液化ガスを気化
器へ通す操作の開始のあと、予め定めた時間の経過後、
温度検出手段にて検出される温度が異常判定温度より高
いときは、液化ガスボンベが接続されているが、その
元バルブが閉まっている状態や、ボンベ内が空である
とか、液化ガスが無い、ボンベが接続されていない等に
より気化器へ液化ガスが流れておらず、従って気化器の
温度低下が無いことを意味するので、液化ガス供給異常
信号が出力される。According to the first aspect of the invention, after the start of the operation of passing the liquefied gas through the vaporizer, after the elapse of a predetermined time,
When the temperature detected by the temperature detecting means is higher than the abnormality determination temperature, the liquefied gas cylinder is connected, but the original valve is closed, the cylinder is empty, or there is no liquefied gas. Since the liquefied gas is not flowing to the vaporizer because the cylinder is not connected or the like, which means that the temperature of the vaporizer does not decrease, a liquefied gas supply abnormality signal is output.
【００１１】また第２発明の装置によると、液化ガスを
気化器へ通す操作の開始のあと、予め定めた時間の経過
後、温度検出手段にて検出される温度が異常判定温度以
下で、且つ、滅菌チャンバ内圧が予め定めた圧力以上と
いう両条件を満足しないときは、液化ガスが正常に供給
され、その気化熱のため気化器の温度低下があり、且
つ、滅菌ガスの供給により滅菌チャンバ内圧が上昇する
という状態が出現していないことを意味するので、液化
ガス供給異常信号が出力される。According to the second aspect of the present invention, after the start of the operation of passing the liquefied gas through the vaporizer, after a predetermined time has elapsed, the temperature detected by the temperature detecting means is equal to or lower than the abnormality determination temperature, and When the internal pressure of the sterilization chamber is not equal to or higher than the predetermined pressure, the liquefied gas is supplied normally, the temperature of the vaporizer decreases due to the heat of vaporization, and the internal pressure of the sterilization chamber is reduced by the supply of the sterilization gas. Does not appear, the liquefied gas supply abnormality signal is output.
【００１２】いずれにしても、出力された異常信号は、
警報装置の作動、ボンベと気化器の途中の弁の閉成指示
等に用いることができる。In any case, the output abnormal signal is
It can be used for activating an alarm device, for instructing to close a valve between a cylinder and a carburetor, and the like.
【００１３】[0013]
【実施例】以下、本発明の実施例を図１及び図２を参照
して説明する。図１は本発明の一実施例である滅菌用液
化ガス供給異常検出装置Ａを備えたガス滅菌器の概略構
成を示している。ここで示されるガス滅菌器は滅菌チャ
ンバ１０を備えており、このチャンバ１０に液化酸化エ
チレンガスボンベ１から電磁弁２及び気化器７を介して
酸化エチレンガスを供給できる構成のものである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a schematic configuration of a gas sterilizer provided with a liquefied gas supply abnormality detecting device A for sterilization according to one embodiment of the present invention. The gas sterilizer shown here has a sterilization chamber 10, and has a configuration in which ethylene oxide gas can be supplied from the liquefied ethylene oxide gas cylinder 1 to the chamber 10 via the solenoid valve 2 and the vaporizer 7.
【００１４】気化器７は液化ガスが通る蛇管６及びこれ
を加熱する電気ヒータ８を備えている。電気ヒータ８に
はオンオフスイッチ３を介して電源ＰＷから通電される
ようになっている。また、滅菌チャンバ１０は、酸化エ
チレンガスの導入に先立ってチャンバ内を真空引きする
ための真空吸引装置１１に接続されている。液化酸化エ
チレンガスの供給異常検出装置Ａは気化器７の温度変化
を検出できるように該気化器に設けた温度センサ４及び
チャンバ１０内の圧力を検出する圧力センサ９並びにマ
イクロコンピュータを中心とする液化ガス供給異常の検
出及び制御のための部分５を含んでいる。The vaporizer 7 includes a flexible tube 6 through which a liquefied gas passes and an electric heater 8 for heating the flexible tube. Electric power is supplied to the electric heater 8 from the power supply PW via the on / off switch 3. The sterilization chamber 10 is connected to a vacuum suction device 11 for evacuating the inside of the chamber prior to the introduction of the ethylene oxide gas. The liquefied ethylene oxide gas supply abnormality detecting device A is mainly composed of a temperature sensor 4 provided in the vaporizer 7 for detecting a temperature change of the vaporizer 7, a pressure sensor 9 for detecting a pressure in the chamber 10, and a microcomputer. A part 5 for detecting and controlling a liquefied gas supply abnormality is included.
【００１５】異常検出・制御部５は、それからの指示に
基づいて電磁弁２を必要に応じ開閉し、気化器ヒータ８
への通電をオンオフするスイッチ３を開閉し、さらに、
真空吸引装置１１を運転或いは停止させることができる
ように構成してある。また、異常検出・制御部５は、気
化器７へ液化酸化エチレンガスを通す操作を開始し始め
てから予め定めた時間Ｔの経過後、予め定めた異常判定
温度（本例では６８℃）以下で、且つ、圧力センサ９に
より検出される滅菌チャンバ内圧力が予め定めた圧力Ｐ
以上という両条件を満足しないときには、液化ガス供給
異常信号を出力して、警報装置ＡＬを作動させるように
構成してある。The abnormality detecting / controlling unit 5 opens and closes the solenoid valve 2 as required based on the instruction from the abnormality detecting / control unit 5 and controls the carburetor heater 8
Open and close switch 3 that turns on and off the power supply to
It is configured so that the vacuum suction device 11 can be operated or stopped. Further, after a predetermined time T has elapsed since the start of the operation of passing the liquefied ethylene oxide gas to the vaporizer 7, the abnormality detection / control unit 5 sets the abnormality detection temperature to a predetermined abnormality determination temperature (68 ° C. in this example) or lower. And the pressure in the sterilization chamber detected by the pressure sensor 9 is a predetermined pressure P
When both of the above conditions are not satisfied, a liquefied gas supply abnormality signal is output to activate the alarm device AL.
【００１６】なお、前記時間Ｔ及び異常判定温度は、予
め実験によって、液化酸化エチレンガスを正常に気化器
７へ流し始めてからの時間経過と気化器温度降下の関係
を調べておいて定めることができる。そしてこれら時間
Ｔ、判定温度及び前記滅菌チャンバ１０内の予め定めた
圧力Ｐは、異常検出・制御部５に記憶させておく。この
ガス滅菌器によると、ボンベ１の元バルブ１１が予め開
けられるとともに、滅菌チャンバ１０が該チャンバへの
酸化エチレンガスの供給に先立って真空吸引装置１１の
運転により所定真空状態まで真空引きされる。一方、ス
イッチ３が閉じられ、ヒータ８に通電され、これによっ
て気化器７が液化ガス気化温度（本例では７０℃）以上
とされる。チャンバ１０内圧力が所定圧力まで低下する
と、真空吸引装置１１は制御部５からの指示に基づき停
止され、代わって電磁弁２が制御部５からの指示に基づ
いて開かれる。The time T and the abnormality determination temperature can be determined in advance by an experiment by examining the relationship between the time elapsed since the liquefied ethylene oxide gas normally started flowing to the vaporizer 7 and the vaporizer temperature drop. it can. Then, the time T, the determination temperature, and the predetermined pressure P in the sterilization chamber 10 are stored in the abnormality detection / control section 5. According to this gas sterilizer, the main valve 11 of the cylinder 1 is opened in advance, and the sterilization chamber 10 is evacuated to a predetermined vacuum state by operating the vacuum suction device 11 prior to the supply of ethylene oxide gas to the chamber. . On the other hand, the switch 3 is closed and the heater 8 is energized, so that the vaporizer 7 is heated to the liquefied gas vaporization temperature (70 ° C. in this example) or higher. When the pressure in the chamber 10 decreases to a predetermined pressure, the vacuum suction device 11 is stopped based on an instruction from the control unit 5, and the solenoid valve 2 is opened based on an instruction from the control unit 5 instead.
【００１７】かくしてボンベ１から電磁弁２を経て気化
器７に流入した液化酸化エチレンガスはそこの蛇管６を
通過する間に加熱されて気化され、気化した酸化エチレ
ンガスがチャンバ１０内へ供給される。チャンバ１０内
の酸化エチレンガス圧力が所定圧力に達すると、電磁弁
２が閉じられる。ボンベ１内にまだ液化酸化エチレンガ
スが存在し、液化ガスが気化器７へ供給され、ここで気
化されて滅菌チャンバ１０へ供給される正常な状態で
は、温度センサ４によって検出される気化器の温度ｔｒ
は、図２に示すように、当初の液化ガスの気化温度又は
それ以上の温度から、液化ガスを流し始めてのち予め定
めた時間Ｔ経過後、異常判定温度以下に低下し、さらに
その後、温度低下して、チャンバ１０へ所定量のガスが
供給されて電磁弁２が閉じられると、再び上昇する。The liquefied ethylene oxide gas which has flowed from the cylinder 1 through the solenoid valve 2 into the vaporizer 7 is heated and vaporized while passing through the flexible tube 6, and the vaporized ethylene oxide gas is supplied into the chamber 10. You. When the ethylene oxide gas pressure in the chamber 10 reaches a predetermined pressure, the solenoid valve 2 is closed. The liquefied ethylene oxide gas is still present in the cylinder 1 and the liquefied gas is supplied to the vaporizer 7 where it is vaporized and supplied to the sterilization chamber 10. Temperature tr
As shown in FIG. 2, after the liquefied gas starts flowing from the initial vaporization temperature of the liquefied gas or higher, after a lapse of a predetermined time T, the temperature drops below the abnormality determination temperature, and thereafter, the temperature drops. Then, when a predetermined amount of gas is supplied to the chamber 10 and the solenoid valve 2 is closed, it rises again.
【００１８】滅菌チャンバ１０内のセンサ９で検出され
る圧力Ｐｒは、ガスの供給に先立つチャンバ１０の真空
引きにより低下し、電磁弁２の開成によるガスの供給と
ともに上昇し、電磁弁２を閉じることにより安定した圧
力状態となる。しかし、電磁弁２を開いてチャンバ１０
へガスを供給する操作を開始しても、何らかの理由によ
って気化器へ液化ガスが流入しないときには、電磁弁２
を開いて気化器７へ液化ガスを供給する操作を開始し始
めてから、前記時間Ｔを経過しても、温度センサ４によ
って検出される気化器の温度は、異常判定温度まで降下
せず、図２に二点鎖線で示すように、若干降下したのち
そのままの状態を維持するか又は当初の温度のままであ
る。また、チャンバ１０内圧力は、変化しないか、若干
変化するのみである。The pressure Pr detected by the sensor 9 in the sterilization chamber 10 is reduced by evacuation of the chamber 10 prior to gas supply, rises with the supply of gas by opening the solenoid valve 2, and closes the solenoid valve 2. This results in a stable pressure state. However, the solenoid valve 2 is opened and the chamber 10 is opened.
If the liquefied gas does not flow into the vaporizer for some reason even after the operation of supplying gas to the
The temperature of the vaporizer detected by the temperature sensor 4 does not drop to the abnormality determination temperature even after the time T has elapsed since the operation of supplying the liquefied gas to the vaporizer 7 was started after the operation was started. As shown by the two-dot chain line in FIG. 2, the state is maintained as it is after a slight drop, or the initial temperature is maintained. Further, the pressure in the chamber 10 does not change or only slightly changes.
【００１９】このように気化器への液化ガス供給異常が
生じる原因としては、次の場合が考えられる。 （Ａ）ボンベ１の元バルブ１１が閉じたままである。ボ
ンベ１が空である。この状態のときには滅菌チャンバ１
０内の圧力変化は殆どない。 （Ｂ）ボンベ内のガス圧はまだあるが、液化ガスが無く
なっている。ボンベ１が接続されていない。The cause of the abnormal supply of the liquefied gas to the vaporizer can be considered as follows. (A) The main valve 11 of the cylinder 1 remains closed. The cylinder 1 is empty. In this state, sterilization chamber 1
There is almost no pressure change within zero. (B) The gas pressure in the cylinder is still present, but the liquefied gas has disappeared. Cylinder 1 is not connected.
【００２０】この状態のときには電磁弁２の開成ととも
にボンベ１内の気化ガスが気化器７を通ってチャンバ１
０内へ若干流入するか、或いは大気が電磁弁２から気化
器７を通ってチャンバ１０へ流入するので、チャンバ１
０内の圧力は若干変化する。前記状態（Ａ）の場合に
は、警報装置ＡＬが作動するので、電磁弁２を閉じて元
バルブ１１を開くか、又は装置全体を停止させてボンベ
１を交換する。In this state, when the solenoid valve 2 is opened, the vaporized gas in the cylinder 1 passes through the vaporizer 7 and passes through the chamber 1.
0, or because the air flows from the solenoid valve 2 through the carburetor 7 into the chamber 10,
The pressure in 0 changes slightly. In the state (A), the alarm device AL is activated, so the solenoid valve 2 is closed and the main valve 11 is opened, or the entire device is stopped and the cylinder 1 is replaced.
【００２１】前記状態（Ｂ）の場合には、警報装置ＡＬ
が作動するので、電磁弁２を閉じて装置全体を停止さ
せ、ボンベ１を交換するか或いはボンベ１を接続する。
以上説明したように、前記液化ガス供給異常検出装置Ａ
によると、様々な液化ガス供給異常が総合的に検出さ
れ、滅菌チャンバ１０において所定量の滅菌ガス濃度が
ないまま滅菌処理を行うという事態の発生が未然に防止
される。In the state (B), the alarm device AL
, The solenoid valve 2 is closed to stop the entire apparatus, and the cylinder 1 is replaced or the cylinder 1 is connected.
As described above, the liquefied gas supply abnormality detection device A
According to this, various liquefied gas supply abnormalities are comprehensively detected, and the occurrence of a situation in which sterilization is performed in the sterilization chamber 10 without a predetermined amount of sterilization gas concentration is prevented beforehand.
【００２２】なお、本発明は前記実施例に限定されるも
のではなく、他の態様でも実施することができる。例え
ば、前記実施例では滅菌チャンバ１０へ正常にガスが供
給されているか否かを正確に判断するため、該チャンバ
内圧力上昇も見ることにしたが、気化器へ正常に液化ガ
スが流れないときには、温度センサ４によって検出され
る温度ｔｒは前記時間Ｔを経過してもなお異常判定温度
以下にはならないのが普通であるから、この点だけを液
化ガス供給異常の判断材料としてもよく、必ずしも滅菌
チャンバ１０内の圧力上昇を見る必要はない。It should be noted that the present invention is not limited to the above embodiment, but can be implemented in other modes. For example, in the above-described embodiment, in order to accurately determine whether or not gas is normally supplied to the sterilization chamber 10, the increase in the pressure in the chamber is also determined. However, when the liquefied gas does not normally flow to the vaporizer, Since the temperature tr detected by the temperature sensor 4 usually does not become lower than the abnormality determination temperature even after the time T has elapsed, only this point may be used as a criterion for determining the liquefied gas supply abnormality. It is not necessary to see the pressure rise in the sterilization chamber 10.
【００２３】また、気化器の温度変化を測定するにあた
っては、気化器が水槽式や金属ブロック式等の熱容量の
大きいものであるときは、気化器入口への配管温度が気
化器温度変化により変動するので、例えば電磁弁２と気
化器の間の配管温度を測定してもよい。In measuring the temperature change of the vaporizer, when the vaporizer is of a water tank type or a metal block type having a large heat capacity, the temperature of the pipe to the vaporizer inlet fluctuates due to the vaporizer temperature change. Therefore, for example, the temperature of the pipe between the solenoid valve 2 and the vaporizer may be measured.
【００２４】[0024]
【発明の効果】以上説明したように本発明によると、滅
菌用液化ガスボンベから導いた液化ガスを加熱手段にて
加熱される気化器に通過させて気化させたのち滅菌チャ
ンバへ送り込むガス滅菌器における滅菌用液化ガス供給
異常検出装置であって、滅菌用液化ガスボンベにおける
液化ガスの有無、該ボンベの未接続、該ボンベの元バル
ブの未開等の各種滅菌用液化ガス供給異常を総合的に正
確に検出できる嵩張らない装置を低コストで提供するこ
とができる。As described above, according to the present invention, there is provided a gas sterilizer in which a liquefied gas guided from a liquefied gas cylinder for sterilization is passed through a vaporizer heated by a heating means, vaporized, and then sent to a sterilization chamber. An apparatus for detecting a liquefied gas supply abnormality for sterilization, which accurately detects various liquefied gas supply abnormalities such as presence / absence of liquefied gas in the liquefied gas cylinder for sterilization, disconnection of the cylinder, and opening of the original valve of the cylinder. A bulky device that can be detected can be provided at low cost.
【図１】本発明の一実施例装置を備えたガス滅菌器の概
略構成図である。FIG. 1 is a schematic configuration diagram of a gas sterilizer provided with an embodiment of the present invention.
【図２】電磁弁の開閉に伴う温度センサによる検出温度
の変化及び滅菌チャンバ内の圧力変化を示すグラフであ
る。FIG. 2 is a graph showing a change in a temperature detected by a temperature sensor and a change in a pressure in a sterilization chamber when the solenoid valve is opened and closed.
１ 液化酸化エチレンガスボンベ １１ 元バルブ ２ 電磁弁 ３ スイッチ ＰＷ 電源 ４ 温度センサ ５ 液化ガス供給異常検出・制御部 ６ 蛇管 ７ 気化器 ８ ヒータ ９ 圧力センサ １０ 滅菌チャンバ １１ 真空吸引装置 ＡＬ 警報装置 DESCRIPTION OF SYMBOLS 1 Liquefied ethylene oxide gas cylinder 11 Main valve 2 Solenoid valve 3 Switch PW power supply 4 Temperature sensor 5 Liquefied gas supply abnormality detection / control unit 6 Serpentine tube 7 Vaporizer 8 Heater 9 Pressure sensor 10 Sterilization chamber 11 Vacuum suction device AL alarm device
Claims (2)
スを加熱手段にて加熱される気化器に通過させて気化さ
せたのち滅菌チャンバへ送り込むガス滅菌器における滅
菌用液化ガス供給異常検出装置であって、前記気化器の
温度変化を検出できる位置に設けた温度検出手段と、前
記気化器へ液化ガスを通すための操作を開始してから予
め定めた時間の経過後、前記温度検出手段にて検出され
る温度が予め定めた異常判定温度より高いときに液化ガ
ス供給異常信号を出力する手段と、を備えたことを特徴
とする装置。An apparatus for detecting an abnormality in supply of a liquefied gas for sterilization in a gas sterilizer in which a liquefied gas guided from a liquefied gas cylinder for sterilization is passed through a vaporizer heated by a heating means to be vaporized, and then sent to a sterilization chamber. A temperature detecting means provided at a position where the temperature change of the vaporizer can be detected, and after elapse of a predetermined time from the start of the operation for passing the liquefied gas through the vaporizer, the temperature detecting means Means for outputting a liquefied gas supply abnormality signal when the detected temperature is higher than a predetermined abnormality determination temperature.
スを加熱手段にて加熱される気化器に通過させて気化さ
せたのち滅菌チャンバへ送り込むガス滅菌器における滅
菌用液化ガス供給異常検出装置であって、前記気化器の
温度変化を検出できる位置に設けた温度検出手段と、前
記滅菌チャンバ内の圧力を検出する圧力検出手段と、前
記気化器へ液化ガスを通すための操作を開始してから予
め定めた時間の経過後、前記温度検出手段にて検出され
る温度が予め定めた異常判定温度以下で、且つ、前記圧
力検出手段にて検出される圧力が予め定めた圧力以上の
両条件を満足しないときは、液化ガス供給異常信号を出
力する手段と、を備えたことを特徴とする装置。2. An apparatus for detecting abnormal supply of liquefied gas for sterilization in a gas sterilizer in which a liquefied gas introduced from a liquefied gas cylinder for sterilization is passed through a vaporizer heated by a heating means, vaporized, and then sent to a sterilization chamber. A temperature detecting means provided at a position where a temperature change of the vaporizer can be detected, a pressure detecting means for detecting a pressure in the sterilization chamber, and an operation for passing a liquefied gas to the vaporizer after starting. After a lapse of a predetermined time, the temperature detected by the temperature detection means is equal to or lower than a predetermined abnormality determination temperature, and the pressure detected by the pressure detection means is equal to or higher than a predetermined pressure. Means for outputting a liquefied gas supply abnormality signal when not satisfied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03137803A JP3129472B2 (en) | 1991-06-10 | 1991-06-10 | Liquefied gas supply abnormality detector for sterilization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03137803A JP3129472B2 (en) | 1991-06-10 | 1991-06-10 | Liquefied gas supply abnormality detector for sterilization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04361754A JPH04361754A (en) | 1992-12-15 |
| JP3129472B2 true JP3129472B2 (en) | 2001-01-29 |
Family
ID=15207217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03137803A Expired - Fee Related JP3129472B2 (en) | 1991-06-10 | 1991-06-10 | Liquefied gas supply abnormality detector for sterilization |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3129472B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6471219B1 (en) * | 2017-12-27 | 2019-02-13 | 東京ガスケミカル株式会社 | Liquefied natural gas evaporator and method for emergency closure of liquefied natural gas evaporator |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005030822A1 (en) * | 2005-07-01 | 2007-01-11 | Krones Ag | Method and apparatus for monitoring an evaporator |
-
1991
- 1991-06-10 JP JP03137803A patent/JP3129472B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6471219B1 (en) * | 2017-12-27 | 2019-02-13 | 東京ガスケミカル株式会社 | Liquefied natural gas evaporator and method for emergency closure of liquefied natural gas evaporator |
| JP2019116915A (en) * | 2017-12-27 | 2019-07-18 | 東京ガスケミカル株式会社 | Liquefied natural gas evaporator, and method for emergently closing liquefied natural gas evaporator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04361754A (en) | 1992-12-15 |
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