JPH085488A - Method of measuring pressure of high-pressure gas - Google Patents
Method of measuring pressure of high-pressure gasInfo
- Publication number
- JPH085488A JPH085488A JP15432594A JP15432594A JPH085488A JP H085488 A JPH085488 A JP H085488A JP 15432594 A JP15432594 A JP 15432594A JP 15432594 A JP15432594 A JP 15432594A JP H085488 A JPH085488 A JP H085488A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- gas
- intermediate chamber
- measuring
- diameter hole
- 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.)
- Withdrawn
Links
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、測定範囲の狭い圧力測
定器を用いて測定範囲外の高圧気体の圧力を測定する圧
力測定方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure measuring method for measuring the pressure of a high pressure gas outside the measuring range using a pressure measuring instrument having a narrow measuring range.
【０００２】[0002]
【従来の技術】従来、気体の圧力は、測定すべき圧力を
測定範囲とする圧力測定器にて測定していた。2. Description of the Related Art Conventionally, the pressure of gas has been measured by a pressure measuring instrument having a pressure to be measured as a measuring range.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、測定す
べき圧力に応じてそれぞれ所望の圧力測定器を準備する
必要があり、不便であった。本発明は、かかる現状に鑑
み、測定範囲の狭い圧力測定器を用いて測定範囲外の高
い圧力を測定する圧力測定方法を提供することを目的と
するものである。However, it is inconvenient because it is necessary to prepare a desired pressure measuring device according to the pressure to be measured. In view of the present situation, it is an object of the present invention to provide a pressure measuring method for measuring a high pressure outside the measuring range using a pressure measuring device having a narrow measuring range.
【０００４】[0004]
【課題を解決するための手段】本発明の高圧気体の圧力
測定方法は、前記の目的を達成するものであって、高圧
気体を収容した容器と中間室とを断面積Ａ1 の微小径孔
を介して連通せしめるとともに、中間室と大気とを前記
微小径孔よりは大径の断面積Ａ2 の微小径孔を介して連
通しめて中間室の気体圧力を低下せしめ、低下した気体
の圧力Ｐ2 を測定し、次式にて高圧気体の圧力Ｐ1 を求
めることを特徴とするものである。 Ｐ1 ＝〔Ｃ（Ａ2 ／Ａ1 ）2 ＋１〕Ｐ2 ただし、Ｃは定数である。The method of measuring the pressure of high-pressure gas according to the present invention achieves the above-mentioned object, wherein the container containing the high-pressure gas and the intermediate chamber have a small-diameter hole having a cross-sectional area A 1. And the atmosphere is communicated with the atmosphere through a small diameter hole having a larger cross-sectional area A 2 than the minute diameter hole to reduce the gas pressure in the intermediate chamber and reduce the gas pressure P. 2 is measured, and the pressure P 1 of the high-pressure gas is obtained by the following equation. P 1 = [C (A 2 / A 1 ) 2 +1] P 2 where C is a constant.
【０００５】[0005]
【作用】本発明の高圧気体の圧力測定方法においては、
高圧気体を収容した容器と中間室とを断面積Ａ1 の微小
径孔を介して連通せしめるとともに、中間室と大気とを
前記微小径孔よりは大径の断面積Ａ2 の微小径孔を介し
て連通しめて中間室の気体圧力を低下せしめるので、中
間室の圧力を測定範囲の狭い圧力測定器を用いても測定
することができ、しかも得られた中間室の圧力と予め測
定しておいた両小孔の断面積とにより測定範囲外の高い
圧力である容器内の圧力を算出することが可能となる。In the method for measuring the pressure of high-pressure gas according to the present invention,
The container containing the high-pressure gas and the intermediate chamber are made to communicate with each other through the small diameter hole having a cross-sectional area A 1 , and the intermediate chamber and the atmosphere are made to have a small diameter hole having a cross-sectional area A 2 larger than the small diameter hole. Since the gas pressure in the intermediate chamber is reduced by communicating with the intermediate chamber, the pressure in the intermediate chamber can be measured using a pressure measuring instrument with a narrow measuring range. The pressure inside the container, which is a high pressure outside the measurement range, can be calculated from the cross-sectional area of both small holes.
【０００６】[0006]
【実施例】以下、本発明を図示の実施例に従って詳細に
説明することとする。The present invention will be described in detail below with reference to the embodiments shown in the drawings.
【０００７】図１において、１は本発明の高圧気体の圧
力測定方法を実施する測定装置の一例を示すものであ
る。In FIG. 1, reference numeral 1 shows an example of a measuring apparatus for carrying out the method for measuring the pressure of high-pressure gas according to the present invention.
【０００８】高圧気体を収容した容器２には、圧力Ｐ1
の気体が充填されており、この容器２の一箇所には、開
口３が形成されていて、この開口３には中間室４が連通
されている。容器２から中間室４に至る前には、断面積
がＡ1 の小孔５を穿設したオリフィス６が配装されてお
り、さらに、この中間室４には、圧力測定器７へ連通す
る開口８と大気へ連通する断面積がＡ2 の小孔９を穿設
したオリフィス１０が配装された開口１１が形成されて
いる。A pressure P 1 is applied to the container 2 containing the high pressure gas.
Is filled with the gas, and an opening 3 is formed at one place of the container 2, and an intermediate chamber 4 is communicated with the opening 3. Before the container 2 reaches the intermediate chamber 4, an orifice 6 having a small hole 5 having a sectional area of A 1 is provided, and the intermediate chamber 4 communicates with a pressure measuring instrument 7. An opening 11 is formed in which an orifice 10 having a small hole 9 having a cross-sectional area of A 2 and communicating with the opening 8 is provided.
【０００９】この大気へ連通する開口１１には、開閉可
能な蓋１２が配装されている。ここで、小孔５，９の断
面積Ａ1 ，Ａ2 はこれから流出する気体の量が測定すべ
き容積に対して無視できる程度の小径となし、かつＡ1
＜Ａ2 とする。A lid 12 that can be opened and closed is provided in the opening 11 that communicates with the atmosphere. Here, the cross-sectional areas A 1 and A 2 of the small holes 5 and 9 are set so that the amount of gas flowing out from them is small enough to be ignored with respect to the volume to be measured, and A 1
<A 2 .
【００１０】測定前の状態においては、中間室４内の圧
力Ｐ2 は容器２内の圧力Ｐ1 と等しいが、ここで、開口
１１の蓋１２を外し、大気と連通せしめると、中間室４
内の圧力Ｐ2 は低下し、これに伴って容器２内の気体は
中間室４へと流入し、ある一定の圧力で定常状態とな
る。このときの圧力Ｐ2 を測定する。測定された圧力Ｐ
2 と高圧気体の圧力Ｐ1 との間には次式が成立するの
で、次式により高圧気体の圧力Ｐ1 を知ることができ
る。 Ｐ1 ＝〔Ｃ（Ａ2 ／Ａ1 ）2 ＋１〕Ｐ2 (1) ただし、Ｃは定数である。In the state before the measurement, the pressure P 2 in the intermediate chamber 4 is equal to the pressure P 1 in the container 2, but when the lid 12 of the opening 11 is removed to make it communicate with the atmosphere, the intermediate chamber 4
The internal pressure P 2 decreases, and along with this, the gas in the container 2 flows into the intermediate chamber 4, and becomes a steady state at a certain constant pressure. The pressure P 2 at this time is measured. Measured pressure P
Since the following equation is established between 2 and the pressure P 1 of the high pressure gas, the pressure P 1 of the high pressure gas can be known from the following equation. P 1 = [C (A 2 / A 1 ) 2 +1] P 2 (1) where C is a constant.
【００１１】小孔５，９の断面積Ａ1 、Ａ2 をＡ1 ＜Ａ
2 の範囲で適切に選択することにより、測定圧力Ｐ2 を
高圧気体の圧力Ｐ1 より所望の小さい範囲の値にするこ
とができるので、レンジの小さい圧力測定器７を使用し
てＰ2 を測定して(1) 式にて算出することにより、レン
ジ巾を超える大きいＰ1 の値を得ることができる。The cross-sectional areas A 1 , A 2 of the small holes 5, 9 are A 1 <A
By appropriately selecting in the range of 2 , the measured pressure P 2 can be set to a value in a desired smaller range than the pressure P 1 of the high-pressure gas, so that P 2 can be set using the pressure measuring device 7 having a small range. A large value of P 1 exceeding the range width can be obtained by measuring and calculating by the formula (1).
【００１２】ここで、(1) 式について以下に説明するこ
ととする。まず、容器２からオリフィス６を通して中間
室４へと流入する気体の流速をＶ1 、流量をＱ1 とする
と、次式(2) と式(3) が成立する。 Ｖ1 ＝Ｃ1 （Ｐ1 −Ｐ2 ）1/2 (2) Ｑ1 ＝Ａ1 Ｖ1 (3)The equation (1) will be described below. First, when the flow rate of gas flowing from the container 2 into the intermediate chamber 4 through the orifice 6 is V 1 and the flow rate is Q 1 , the following equations (2) and (3) are established. V 1 = C 1 (P 1 -P 2 ) 1/2 (2) Q 1 = A 1 V 1 (3)
【００１３】(3) 式に(2) 式を代入すると、次式(4) が
成立する。 Ｑ1 ＝Ａ1 Ｃ1 （Ｐ1 −Ｐ2 ）1/2 (4)Substituting the equation (2) into the equation (3), the following equation (4) is established. Q 1 = A 1 C 1 ( P 1 -P 2) 1/2 (4)
【００１４】次に、中空室４から小孔９を通して大気へ
流出する気体の流速をＶ2 、流量をＱ2 とすると、次式
(5) と式(6) が成立する。 Ｖ2 ＝Ｃ2 （Ｐ2 −０）1/2 ＝Ｃ2 （Ｐ2 ）1/2 (5) Ｑ2 ＝Ａ2 Ｖ2 (6)Next, letting V 2 be the flow velocity of gas flowing out of the hollow chamber 4 through the small holes 9 into the atmosphere, and Q 2 be the flow rate, the following equation is obtained.
(5) and Eq. (6) are established. V 2 = C 2 (P 2 −0) 1/2 = C 2 (P 2 ) 1/2 (5) Q 2 = A 2 V 2 (6)
【００１５】(6) 式に(5) 式を代入すると、次式(4) が
成立する。 Ｑ2 ＝Ａ2 Ｃ2 （Ｐ2 ）1/2 (7)By substituting the equation (5) into the equation (6), the following equation (4) is established. Q 2 = A 2 C 2 (P 2 ) 1/2 (7)
【００１６】(4) 式の流量Ｑ1 と(7) 式の流量Ｑ2 とは
等しいので、次式が得られる。 Ａ1 Ｃ1 （Ｐ1 −Ｐ2 ）1/2 ＝Ａ2 Ｃ2 （Ｐ2 ）1/2 ∴（Ｐ1 −Ｐ2 ）1/2 ／（Ｐ2 ）1/2 ＝Ｃ2 Ａ2 ／Ｃ1 Ａ1 ∴（Ｐ1 −Ｐ2 ）／Ｐ2 ＝（Ｃ2 ／Ｃ1 ）2 （Ａ2 ／Ａ1 ）2 ∴ Ｐ1 ＝〔Ｃ（Ａ2 ／Ａ1 ）2 ＋１〕Ｐ2 (1) Since the flow rate Q 1 in the equation (4) is equal to the flow rate Q 2 in the equation (7), the following equation is obtained. A 1 C 1 (P 1 -P 2 ) 1/2 = A 2 C 2 (P 2 ) 1/2 ∴ (P 1 -P 2 ) 1/2 / (P 2 ) 1/2 = C 2 A 2 / C 1 A 1 ∴ (P 1 -P 2) / P 2 = (C 2 / C 1) 2 (A 2 / A 1) 2 ∴ P 1 = [C (A 2 / A 1) 2 +1 ] P 2 (1)
【００１７】なお、オリフィスの両小孔が半径Ｄ1 ，Ｄ
2 の円形である場合には、次式が成立するが、小孔は必
ずしも円形でなくても良い。 Ｐ1 ＝〔Ｃ（Ｄ2 ／Ｄ1 ）4 ＋１〕Ｐ2 (8)Both small holes of the orifice have radii D 1 , D 2.
In the case of the circular shape of 2 , the following formula is established, but the small holes do not necessarily have to be circular. P 1 = [C (D 2 / D 1 ) 4 +1] P 2 (8)
【００１８】式(1) 、式(8) における定数Ｃは、オリフ
ィス６とオリフィス１０との小孔５，９の断面積、板
厚、入口形状などによって定まるので、予め所定の断面
積等を設定したオリフィスを用いてＰ1 とＰ2 とを測定
して、Ｃを算出しておくことが必要である。圧力測定器
は単に測定した圧力を表示するのみならず、測定した圧
力に応じて信号を発信するものであって良く、これによ
りＰ1 の圧力に応じて各種の制御をすることも可能であ
る。The constant C in equations (1) and (8) is determined by the cross-sectional area of the small holes 5, 9 between the orifice 6 and the orifice 10, the plate thickness, the inlet shape, etc. It is necessary to measure P 1 and P 2 using the set orifice and calculate C in advance. The pressure measuring device is not limited to simply displaying the measured pressure, but may be a device that emits a signal in accordance with the measured pressure, whereby various controls can be performed according to the pressure of P 1. .
【００１９】[0019]
【発明の効果】本発明によれば、高圧気体を収容した容
器と中間室との間に配装した微小径孔と中間室と大気と
の間に配装した前記微小径孔よりは大径の微小径孔とを
用いて流出させることにより、中間室の圧力を測定範囲
の狭い圧力測定器を用いても測定することが可能とな
り、得られた中間室の圧力と予め測定しておいた両小孔
の断面積とにより測定範囲外の高い圧力である容器内の
圧力を算出することが可能となった。EFFECTS OF THE INVENTION According to the present invention, a small diameter hole provided between the container containing the high pressure gas and the intermediate chamber and a diameter larger than the small diameter hole provided between the intermediate chamber and the atmosphere. It is possible to measure the pressure in the intermediate chamber by using a pressure measuring instrument with a narrow measuring range by using the small diameter holes and the pressure of the obtained intermediate chamber. With the cross-sectional area of both small holes, it became possible to calculate the pressure inside the container, which is a high pressure outside the measurement range.
【図１】本発明の一実施例を示す概略説明図である。FIG. 1 is a schematic explanatory view showing an embodiment of the present invention.
１ 圧力測定装置 ２ 容器 ３，８，１１ 開口 ４ 中間室 ５，９ 小孔 ６，１０ オリフィス ７ 圧力測定器 １２ 蓋 1 Pressure Measuring Device 2 Container 3,8,11 Opening 4 Intermediate Chamber 5,9 Small Hole 6,10 Orifice 7 Pressure Measuring Device 12 Lid
Claims (1)
積Ａ1 の微小径孔を介して連通せしめるとともに、中間
室と大気とを前記微小径孔よりは大径の断面積Ａ2 の微
小径孔を介して連通しめて中間室の気体圧力を低下せし
め、低下した気体の圧力Ｐ2を測定し、次式にて高圧気
体の圧力Ｐ1 を求めることを特徴とする高圧気体の圧力
測定方法。 Ｐ1 ＝〔Ｃ（Ａ2 ／Ａ1 ）2 ＋１〕Ｐ2 ただし、Ｃは定数である。1. A container containing a high-pressure gas and an intermediate chamber are made to communicate with each other through a small-diameter hole having a cross-sectional area A 1 , and the intermediate chamber and the atmosphere are larger in cross-sectional area A 2 than the small-diameter hole. extremely small diameter hole through the closing communication allowed reducing the gas pressure in the intermediate chamber, the pressure P 2 is measured in reduced gas pressure of the high pressure gas and obtaining the pressure P 1 of the high-pressure gas by the following formula Measuring method. P 1 = [C (A 2 / A 1 ) 2 +1] P 2 where C is a constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15432594A JPH085488A (en) | 1994-06-14 | 1994-06-14 | Method of measuring pressure of high-pressure gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15432594A JPH085488A (en) | 1994-06-14 | 1994-06-14 | Method of measuring pressure of high-pressure gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH085488A true JPH085488A (en) | 1996-01-12 |
Family
ID=15581680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15432594A Withdrawn JPH085488A (en) | 1994-06-14 | 1994-06-14 | Method of measuring pressure of high-pressure gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH085488A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289626A (en) * | 2016-08-12 | 2017-01-04 | 安徽中杰信息科技有限公司 | Dangerous materials pressure of storage tank detection method |
-
1994
- 1994-06-14 JP JP15432594A patent/JPH085488A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289626A (en) * | 2016-08-12 | 2017-01-04 | 安徽中杰信息科技有限公司 | Dangerous materials pressure of storage tank detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010904 |