JPH0462744B2 - - Google Patents
Info
- Publication number
- JPH0462744B2 JPH0462744B2 JP63235273A JP23527388A JPH0462744B2 JP H0462744 B2 JPH0462744 B2 JP H0462744B2 JP 63235273 A JP63235273 A JP 63235273A JP 23527388 A JP23527388 A JP 23527388A JP H0462744 B2 JPH0462744 B2 JP H0462744B2
- Authority
- JP
- Japan
- Prior art keywords
- sterilization
- temperature
- inner cylinder
- steam
- sterilized
- 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 - Lifetime
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- Apparatus For Disinfection Or Sterilisation (AREA)
Description
この発明は、例えば、医療用器具等を滅菌する
のに用いられる蒸気滅菌装置の制御方法に関する
ものである。
The present invention relates to a method of controlling a steam sterilizer used, for example, to sterilize medical instruments and the like.
従来より使用されている蒸気滅菌装置の基本の
構成は、第１図のような構成であつて、滅菌槽
は、被滅菌物を収容する内筒１と、この内筒１を
囲んで設けた外筒２とから成つている。
該内筒１には、途中真空ポンプ８を介した吸引
路９の一端と、空気フイルタ６に一端を接続した
空気流路５の他端とが接続されている。
また、外筒２には、蒸気発生器４からの蒸気を
導入する給蒸路３の一端及び一端を内筒１に接続
した蒸気経路７の他端が接続されている。
このように構成された蒸気滅菌装置において
は、蒸気発生器４から供給される蒸気は、まず、
外筒２と内筒１の間の蒸気チヤンバ１２に貯えら
れ、内筒１内を加温する。
その上で真空ポンプ８の駆動により内筒１内の
空気を排出し、次いで蒸気経路７の途中の電磁弁
１３を短時間開放して、蒸気を蒸気チヤンバから
内筒へ送り込む燥作を繰り返し行う真空行程に入
る。
この真空行程終了後、蒸気経路７を通して蒸気
チヤンバ内の蒸気を内筒に導入し、内筒を蒸気で
充満させ、内筒内の被滅菌物を滅菌する滅菌行程
に至る。
この滅菌行程では、滅菌装置の下方に取り付け
られた温度センサ１０により、上記の内筒内で凝
縮したドレン温度等を計測することによつて、内
筒内の温度を検出し、これが滅菌温度となつた時
点で開始と判断し、予め決められた時間に従つて
滅菌を行い、終了するようになつている。
The basic structure of conventionally used steam sterilizers is as shown in Fig. 1, in which the sterilization tank includes an inner cylinder 1 for storing objects to be sterilized, and an inner cylinder 1 surrounding the inner cylinder 1. It consists of an outer cylinder 2. The inner cylinder 1 is connected to one end of a suction path 9 via a vacuum pump 8 and the other end of an air flow path 5 whose one end is connected to an air filter 6 . Further, the outer cylinder 2 is connected to one end of a steam supply path 3 through which steam from the steam generator 4 is introduced, and the other end of a steam path 7 that connects the one end to the inner cylinder 1. In the steam sterilizer configured in this way, the steam supplied from the steam generator 4 is first
Steam is stored in a steam chamber 12 between the outer cylinder 2 and the inner cylinder 1, and heats the inside of the inner cylinder 1. Then, the air in the inner cylinder 1 is discharged by driving the vacuum pump 8, and then the solenoid valve 13 in the middle of the steam path 7 is opened for a short time, and the drying process is repeated in which steam is sent from the steam chamber to the inner cylinder. Enter the vacuum process. After the vacuum stroke ends, the steam in the steam chamber is introduced into the inner cylinder through the steam path 7, the inner cylinder is filled with steam, and a sterilization process is started in which the object to be sterilized in the inner cylinder is sterilized. In this sterilization process, the temperature inside the inner cylinder is detected by measuring the temperature of the condensed water in the inner cylinder with the temperature sensor 10 installed below the sterilizer, and this is the sterilization temperature. The system determines that it is time to start when the sterilization reaches the point where the sterilization process ends at a predetermined time.
ところが、内筒内温度と、被滅菌物温度には、
温度差があり、実際には滅菌行程に移つた後も、
一定時間は被滅菌物の昇温に費されることにな
る。
しかも、このときの温度上昇は被滅菌物の種
類、量によつて種々異なり、予め滅菌時間を一定
時間に設定すると、滅菌不良（不足）或いは滅菌
過多を招き、適正な滅菌が為されない。
However, the temperature inside the inner cylinder and the temperature of the object to be sterilized are
Due to the temperature difference, even after the sterilization process begins,
A certain amount of time is spent raising the temperature of the object to be sterilized. Moreover, the temperature rise at this time varies depending on the type and amount of the object to be sterilized, and if the sterilization time is set in advance to a certain period of time, sterilization failure (insufficient sterilization) or excessive sterilization will occur, and proper sterilization will not be performed.
この発明は、上記の課題を解決するためになさ
れたものであつて、滅菌槽内筒内温度を温度セン
サーにより検出し、これを、演算器に入力して温
度上昇の時間に対する変化率を求めると同時に、
該演算器に予め記録した各種被滅菌物量に対応す
る変化率パターンのデータと対比することによつ
て、被滅菌物の量を推量し、上記変化率の大小に
応じて滅菌時間を短縮・延長する如く必要な滅菌
時間を自動的に決定することを特徴とする蒸気滅
菌装置の制御方法である。
This invention was made to solve the above problem, and the temperature inside the sterilization tank is detected by a temperature sensor, and this is input to a calculator to calculate the rate of change in temperature over time. At the same time,
By comparing data of change rate patterns corresponding to various amounts of objects to be sterilized recorded in advance in the calculator, the amount of objects to be sterilized is estimated, and the sterilization time is shortened or extended depending on the magnitude of the above change rate. This is a method of controlling a steam sterilizer, characterized in that the required sterilization time is automatically determined as follows.
以下、この発明の実施例を第１図に示す蒸気滅
菌装置に適用した場合について説明する。
図において、１は、被滅菌物を収納する滅菌槽
内筒であり、前面には被滅菌物出入れ用の扉（図
示せず）が取付けられ、これを閉じた後は、蒸気
の漏れがないよう密閉できるようになつている。
この内筒１には、滅菌後、内筒１内に空気を流入
させるために、一端に空気フイルタ６を取付けた
空気流路５の他端が接続されており、さらに途中
真空ポンプ８を介した吸引路９の一端及び内筒内
蒸気排出のための排出路１１の一端がそれぞれ接
続されている。
該内筒１を取囲んで設けられた外筒２と内筒１
の間は加熱用蒸気を貯溜するための密閉された蒸
気チヤンバ１２となるもので、これには、一端を
蒸気発生器４に接続した給蒸路３の他端並びに一
端が内筒１に接続された蒸気経路７の他端が取付
けられている。
また、排出路１１並びに吸引路９と内筒１の間
に存する温度センサ１０は、排出路１１に至る排
出ドレン温度を測定するものであるが、内筒１内
に取付け、直接内筒内温度を測定しても差し支え
ない。
次にその操作について説明する。
蒸気発生器４で生じた蒸気は、給蒸路３を通つ
て蒸気チヤンバ１２に貯えられ、内筒１内を加温
する。
その上で、真空ポンプ８の駆動で内筒内の空気
を排出、次いで蒸気経路７の途中の電磁弁１３を
短時間開放し、蒸気を蒸気チヤンバ１２から内筒
１へ送り込む操作を繰返し行う真空行程に入る。
真空行程終了後、再び蒸気経路７により内筒１
内に供蒸し、内筒１内を高温高圧の蒸気で充満さ
せ、被滅菌物の設定滅菌温度への上昇をまつて滅
菌行程に移る。
この滅菌物温度は排出路１１に至る内筒１内で
凝縮したドレン温度を温度センサ１０により測定
して推量する。
第２図はかかる温度上昇を示すグラフであり、
縦軸が温度Ｔ、横軸が時間ｔである。
グラフ中、Ａは比較的被滅菌物量の多い場合の
設定滅菌温度T1までの温度推移であり、被滅菌
物が少なくなると共に、グラフＢに近づいてい
く。
第３図は、この温度推移を被滅菌物の量によつ
て、例えば、５つの範囲(h)，(i)，(j)，(k)，(l)に分
けたものであり、この温度変化率をデータとして
演算器（コンピユータ）１４に記録しておき、実
際に、温度センサ(10)によつて出力された内筒内温
度の推移を該演算器１４に入力して温度変化率を
求め、どの範囲に当てはまるかを決定する。
かかる各温度変化率(h)〜(l)には、第４図に示す
ような、設定された滅菌時間t1′に、予め実験等
により求められた、充分に滅菌するための対応す
る遅延時間th′〜tl′が定められており、求められ
た範囲(h)〜(l)によつて、総滅菌時間は（t1′＋th′）
〜（t1′＋tl′）の間を推移する。これにより、過
不足なく、被滅菌物量に合つた滅菌が行われる。
もちろん、この遅延時間は、設定滅菌時間
t1′より先にカウントされてもよく、また遅延時
間としてではなく、予め（t1′＋tx′）を各滅菌時
間として各々入力しておいても良い。
或いは、この被滅菌物量を推定する手段とし
て、第２図、第３図に示すように、設定滅菌温度
T1に上昇するまでの時間ta，tbを求め、これが
該当する時間範囲th〜tlを見分けて被滅菌物量を
推定し、滅菌時間の決定を行うようにすることも
できる。
また、各種、滅菌物の種類により、温度変化
率、或いは遅延時間は変化するので、各滅菌物の
種類ごとにこの温度変化率や遅延時間のデータを
各コースとして入力しておき、かかる蒸気滅菌装
置の操作パネルにそのコースの選択用スイツチを
設けておき、操作時の被滅菌物により操作者に任
意にコース選択をさせるようにすれば、多種の被
滅菌物の滅菌にも対応し得るものである。
Hereinafter, a case where an embodiment of the present invention is applied to the steam sterilizer shown in FIG. 1 will be described. In the figure, 1 is the inner cylinder of the sterilization tank that stores the objects to be sterilized, and a door (not shown) for putting in and taking out the objects to be sterilized is attached to the front. After closing this door, there is no leakage of steam. It is designed so that it can be sealed tightly to prevent it from happening.
The other end of an air flow path 5 having an air filter 6 attached to one end is connected to the inner cylinder 1 in order to allow air to flow into the inner cylinder 1 after sterilization. One end of the suction passage 9 and one end of a discharge passage 11 for discharging steam inside the inner cylinder are connected to each other. An outer cylinder 2 and an inner cylinder 1 are provided surrounding the inner cylinder 1.
The chamber 12 serves as a sealed steam chamber 12 for storing heating steam; The other end of the steam path 7 is attached. Further, the temperature sensor 10 existing between the discharge passage 11, the suction passage 9, and the inner cylinder 1 measures the temperature of the discharge drain reaching the discharge passage 11, and is installed inside the inner cylinder 1 to directly measure the temperature inside the inner cylinder. It is okay to measure. Next, the operation will be explained. Steam generated by the steam generator 4 passes through the steam supply path 3 and is stored in the steam chamber 12 to heat the inside of the inner cylinder 1. Then, the air in the inner cylinder is discharged by driving the vacuum pump 8, and then the electromagnetic valve 13 in the middle of the steam path 7 is opened for a short time, and the operation of sending steam from the steam chamber 12 to the inner cylinder 1 is repeated. Get on the journey. After the vacuum stroke is completed, the inner cylinder 1 is again connected to the steam path 7.
The interior of the inner cylinder 1 is filled with high-temperature, high-pressure steam, and after the temperature of the object to be sterilized reaches the set sterilization temperature, the sterilization process begins. The temperature of the sterilized material is estimated by measuring the temperature of the condensed condensate in the inner cylinder 1 leading to the discharge passage 11 using the temperature sensor 10. FIG. 2 is a graph showing such temperature rise,
The vertical axis is temperature T, and the horizontal axis is time t. In the graph, A is the temperature transition up to the set sterilization temperature T1 when the amount of objects to be sterilized is relatively large, and as the amount of objects to be sterilized decreases, it approaches graph B. Figure 3 shows this temperature transition divided into five ranges (h), (i), (j), (k), and (l) depending on the amount of material to be sterilized. The rate of temperature change is recorded as data in a computer (computer) 14, and the transition of the inner cylinder temperature actually output by the temperature sensor (10) is input to the computer 14 to calculate the rate of temperature change. and determine which range it falls within. Each of these temperature change rates (h) to (l) has a corresponding delay for sufficient sterilization determined in advance by experiment etc. at the set sterilization time t 1 ' as shown in FIG. The time th′ to tl′ is determined, and the total sterilization time is (t 1 ′ + th′) depending on the determined range (h) to (l).
It changes between ~(t 1 ′+tl′). As a result, sterilization is performed in accordance with the amount of objects to be sterilized, without excess or deficiency. Of course, this delay time is the same as the set sterilization time
It may be counted before t 1 ', and (t 1 '+tx') may be input in advance as each sterilization time instead of as a delay time. Alternatively, as a means of estimating the amount of material to be sterilized, as shown in Figures 2 and 3, the set sterilization temperature
It is also possible to determine the time ta and tb until the temperature rises to T1 , identify the time range th to tl to which these apply, estimate the amount of material to be sterilized, and determine the sterilization time. In addition, since the temperature change rate or delay time changes depending on the type of sterilized item, the temperature change rate or delay time data should be entered as each course for each type of sterilized item. If a switch for selecting the course is provided on the operation panel of the device, and the operator is allowed to select the course at will depending on the object to be sterilized during operation, it can be used to sterilize a wide variety of objects to be sterilized. It is.
この発明は、前述のような構成であり、被滅菌
物の量、種類に合つた適正な滅菌が可能であるの
で、滅菌不良を防止し、常に所望の滅菌効果が得
られるのみならず、滅菌過剰をも防止し、蒸気や
時間の浪費を防止でき、運転コストの低滅を図る
ことができる等、種々の効果を有する。
しかも、このような顕著な特長を有するにも関
らず、演算器での処理が単純で少ないため、低コ
ストで信頼性の高い制御回路を提供することがで
きる。
This invention has the above-mentioned configuration, and is capable of performing appropriate sterilization according to the amount and type of objects to be sterilized, thereby preventing poor sterilization and always achieving the desired sterilization effect. It has various effects such as preventing excess, preventing wastage of steam and time, and reducing operating costs. Moreover, in spite of having such remarkable features, the processing required by the arithmetic unit is simple and small, so that a highly reliable control circuit can be provided at low cost.
第１図は、この発明を実施する蒸気滅菌装置の
一例を示す概略図、第２図及び第３図は、滅菌槽
内の温度と時間の関係を示す線図、第４図は滅菌
温度と時間の関係を示す線図である。
１……内筒、２……外筒、１２……蒸気チヤン
バ、th′〜tl′……遅延時間。
Fig. 1 is a schematic diagram showing an example of a steam sterilization apparatus implementing the present invention, Figs. 2 and 3 are diagrams showing the relationship between the temperature in the sterilization tank and time, and Fig. 4 is a diagram showing the relationship between the sterilization temperature and time. It is a diagram showing a time relationship. 1...Inner cylinder, 2...Outer cylinder, 12...Steam chamber, th'~tl'...Delay time.
Claims (1)
り検出し、これを、演算器１４に入力して温度上
昇の時間に対する変化率を求めると同時に、該演
算器１４に予め記録した各種被滅菌物量に対応す
る変化率パターンのデータと対比することによつ
て、被滅菌物の量を推量し、上記変化率の大小に
応じて滅菌時間を短縮・延長する如く必要な滅菌
時間を自動的に決定することを特徴とする蒸気滅
菌装置の制御方法。1. The temperature inside the sterilization tank inner cylinder 1 is detected by the temperature sensor 10, and this is input to the calculator 14 to calculate the rate of change of temperature rise over time. By comparing the data with the change rate pattern corresponding to the above, the amount of the object to be sterilized is estimated, and the necessary sterilization time is automatically determined, such as shortening or extending the sterilization time depending on the magnitude of the change rate. A method for controlling a steam sterilizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63235273A JPH0282978A (en) | 1988-09-19 | 1988-09-19 | Control of steam sterilizing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63235273A JPH0282978A (en) | 1988-09-19 | 1988-09-19 | Control of steam sterilizing apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0282978A JPH0282978A (en) | 1990-03-23 |
| JPH0462744B2 true JPH0462744B2 (en) | 1992-10-07 |
Family
ID=16983654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63235273A Granted JPH0282978A (en) | 1988-09-19 | 1988-09-19 | Control of steam sterilizing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0282978A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS614267A (en) * | 1984-06-18 | 1986-01-10 | Nec Corp | Three-dimensional mounting circuit module |
-
1988
- 1988-09-19 JP JP63235273A patent/JPH0282978A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0282978A (en) | 1990-03-23 |
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