KR101651800B1 - Non-contact type gas pressure measuring device - Google Patents

Non-contact type gas pressure measuring device Download PDF

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Publication number
KR101651800B1
KR101651800B1 KR1020160006489A KR20160006489A KR101651800B1 KR 101651800 B1 KR101651800 B1 KR 101651800B1 KR 1020160006489 A KR1020160006489 A KR 1020160006489A KR 20160006489 A KR20160006489 A KR 20160006489A KR 101651800 B1 KR101651800 B1 KR 101651800B1
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KR
South Korea
Prior art keywords
gas
unit
pressure
mass
container
Prior art date
Application number
KR1020160006489A
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Korean (ko)
Inventor
김환수
Original Assignee
(주)리가스
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Priority to KR1020160006489A priority Critical patent/KR101651800B1/en
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Publication of KR101651800B1 publication Critical patent/KR101651800B1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/02—Arrangements for preventing, or for compensating for, effects of inclination or acceleration of the measuring device; Zero-setting means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/22—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for apportioning materials by weighing prior to mixing them
    • G01G19/24—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for apportioning materials by weighing prior to mixing them using a single weighing apparatus
    • G01G19/28—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for apportioning materials by weighing prior to mixing them using a single weighing apparatus having fluid weight-sensitive devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/0092—Pressure sensor associated with other sensors, e.g. for measuring acceleration or temperature
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L21/00—Vacuum gauges
    • G01L21/02—Vacuum gauges having a compression chamber in which gas, whose pressure is to be measured, is compressed
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
    • G01L7/16—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of pistons
    • G01L7/166—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of pistons with mechanical transmitting or indicating means

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

The present invention relates to a gas pressure measuring device. The gas pressure measuring device comprises: a mass measuring unit to measure the entire mass of a container in which gas is accommodated; an input unit to receive a type of the gas, a volume of the container, mass of the container only excluding the gas, a current temperature, and the entire mass measured by the mass measuring unit; a storage unit to store a gas constant for each gas type, a molecular weight, and a coefficient of compressibility; a calculation unit to calculate a pressure of the gas based on values inputted into the input unit and the gas constant stored in the storage unit; a display unit to display the pressure of the gas calculated by the calculation unit; and a control unit to control the calculation unit to calculate the pressure of the gas based on the values inputted into the input unit, and control the display unit to display the calculated pressure of the gas. The calculation unit calculates the pressure of the gas based on an ideal gas equation, PV = ZnRT.

Description

[0001] NON-CONTACT TYPE GAS PRESSURE MEASURING DEVICE [0002]

The present invention relates to a gas pressure measuring instrument, and more particularly, to a non-contact gas pressure measuring instrument capable of measuring pressure without contacting with a measuring gas.

Generally, a pressure gauge is a device for measuring the pressure of a liquid or gas in a closed container. There are many types, but a bourdon pressure gauge is usually used.

The bourbon pressure gauge includes a bourdon tube inside the case and a power transmission member capable of rotating the bourdon tube in accordance with the movement of the bourdon tube provided at the end of the bourdon tube is provided. In this bourdon pressure gauge, when the liquid or gas to be measured is drawn in, the bourdon tube expands and the free end of the bourdon tube moves. Then, through the power transmitting member connected to the free end of the bourbon tube, the scale is indicated so that the needle can rotate and know the pressure.

Here, when measuring the pressure of the gas using a bourondo pressure gauge or other type of pressure gauge, a pressure gauge is connected to the valve of the container in which the gas is contained, and the valve is opened to measure the pressure.

In order to measure the pressure of the gas, the pressure gauge must be attached and detached for each container in which the gas is housed, thereby increasing the fatigue and the work efficiency due to the simple labor of the operator.

Further, when the pressure of the gas is measured using a conventional pressure gauge, there is a problem that the gas used for the pressure measurement is discarded without filtration in the process of attaching and detaching the pressure gauge. In other words, expensive gas can cause economic loss, and combustible and toxic gas can harm the operator or act as a risk factor.

In addition, since the plastic wrapping paper which is put on the valve of the container must be removed, garbage is generated and the plastic wrapping paper must be covered on the valve again after the pressure measurement is completed, which is cumbersome and economical.

Published Utility Model No. 20-2014-0002056 "Pressure gauge"

SUMMARY OF THE INVENTION An object of the present invention is to provide a gas pressure gauge capable of measuring a pressure of a gas contained in a container without contacting a gas to be measured.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention by those skilled in the art.

The object of the present invention can be achieved by a non-contact type gas pressure gauge. The gas pressure measuring device of the present invention comprises: a mass measuring part for measuring the total mass of a container in which a gas is accommodated; An input unit for inputting the type of the gas, the volume of the container, the mass of the container excluding the gas, the current temperature, and the total mass measured by the mass measuring unit; A storage unit for storing gas constants, molecular weights and compression coefficients for each gas type; A calculation unit for calculating a pressure of the gas based on the values input through the input unit and the gas constants stored in the storage unit; a display unit for displaying the pressure of the gas calculated by the calculation unit; And a control unit for controlling the display unit so as to calculate the pressure of the gas based on the value input from the input unit and to display the pressure of the calculated gas, wherein the calculating unit calculates the ideal gas state equation PV = ZnRT based on And the pressure of the gas is calculated.

According to an embodiment, the input unit, the storage unit, the calculating unit, the display unit, and the control unit are housed in the main body, the mass measuring unit is horizontally disposed on the floor surface, And is coupled to the support shaft.

The gas pressure measuring apparatus according to the present invention can calculate the gas pressure simply by using the gas specific mass and the ideal gas state equation. Accordingly, it is possible to reduce the labor required for measuring the pressure of the gas and shorten the working time, thereby increasing the work efficiency.

Further, since the gas can be measured in a state in which the gas is accommodated in the vessel without directly contacting with the gas, there is no waste gas and it is economical and safety of the operator can be guaranteed.

1 is a perspective view showing an external configuration of a gas pressure measuring instrument according to the present invention,
2 is a block diagram schematically showing the configuration of a gas pressure measuring instrument according to the present invention.

For a better understanding of the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the elements in the drawings can be exaggeratedly expressed to emphasize a clearer description. It should be noted that in the drawings, the same members are denoted by the same reference numerals. Detailed descriptions of well-known functions and constructions which may be unnecessarily obscured by the gist of the present invention are omitted.

FIG. 1 is a perspective view showing the configuration of a gas pressure measuring instrument 100 according to the present invention, and FIG. 2 is a block diagram schematically showing a configuration of a gas pressure measuring instrument 100.

The gas pressure measuring instrument 100 according to the present invention can measure the pressure of the gas B without directly contacting the gas B to measure the pressure. Accordingly, since the process of attaching and detaching the pressure gauge to and from the container is omitted in the conventional art, the fatigue of the worker can be reduced and the work efficiency can be increased.

A gas pressure measuring instrument 100 according to the present invention includes an input unit 110 for inputting essential information for measuring pressure from an operator, a mass measuring unit 120 for measuring a mass of the container A containing the gas B, A storage unit 130 for storing various information for pressure measurement, a calculation unit 140 for calculating the pressure of the gas based on the essential information input through the input unit 110 and the information stored in the storage unit, A display unit 150 for displaying the pressure of the gas calculated in the unit 140, and a control unit 160 for controlling the respective components.

The gas pressure measuring instrument 100 according to the present invention includes a mass measuring part 120 for measuring the mass of the container A containing the base body B and a body 170 ). A storage unit 130, a calculation unit 140 and a control unit 160 are accommodated in the main body 170 and an input unit 110 and a display unit 150 are provided outside the main body 170. The main body 170 is disposed on the mass measuring part 120 so as to be spaced apart from the main body supporting shaft 171 by a predetermined height.

The outer shape of the main body 170 and the mass measuring unit 120 may be variously modified as well as the illustrated examples.

The input unit 110 receives information related to a gas desired to be measured by the operator. The input unit 110 is formed in the form of an input panel. The operator inputs the type of the gas B to be measured, the volume of the container A in which the gas B is stored, the mass of the container itself excluding the gas B, The total mass of the container including the gas measured by the mass measuring unit 120 is input.

The input unit 110 is formed in the form of an input panel capable of inputting numbers and texts so that an operator can directly input the type of gas and various information. In some cases, the input unit 110 may be formed in association with the display unit 150, the storage unit 130, and the control unit 160. In this case, the type of various gases stored in the storage unit 130 may be displayed through the display unit 150, and the operator may input the desired gas by selecting a desired gas.

The mass measuring unit 120 measures the weight of the container A in which the base body B is accommodated. The mass measuring unit 120 may be provided in the form of a general scale. When the container A is placed on the upper surface of the mass measuring unit 120, the total mass measured through the display unit 150 is displayed. Also, the total mass measured by the mass measuring unit 120 may be transmitted to the calculating unit 140 and used for gas pressure calculation.

The storage unit 130 is provided in the main body 170 and stores various kinds of information required for gas pressure measurement. In the storage unit 130, a gas constant for each gas, a molecular weight for each gas, and a compression coefficient are stored.

The calculation unit 140 calculates the pressure of the base body B accommodated in the container A based on the information input by the operator through the input unit 110 and the information stored in the storage unit 130. [ The calculation unit 140 calculates the pressure of the base body B using the ideal gas state equation.

PV = ZnRT (ideal gas state equation),

P: Pressure (atm)

V: volume (L)

Z: compression coefficient

n: molar number, mass / molecular weight

R: gas constant (L? Atm / K? Mol)

T: Temperature (K)

Here, the volume is the volume of the container A input by the operator through the input unit 110, the compression coefficient is the value stored in the storage unit 130, and the number of moles is the molecular weight per gas stored in the storage unit 130 Is obtained by subtracting the mass of only the container input by the operator from the total mass measured by the mass measuring unit 120. [ The gas constant uses the value stored in the storage unit 130, and the temperature uses the value input by the operator.

The calculation unit 140 calculates the pressure of the gas by substituting the above values into the ideal gas state equation.

The display unit 150 displays the pressure of the gas calculated by the calculation unit 140 so that the operator can recognize the pressure. The display unit 150 is provided on the front surface of the main body 170.

The control unit 160 controls the configurations so that the respective configurations are operated according to the set order when the operator desires to measure the pressure. For example, when an operator operates a pressure measurement start button provided in the input unit 110, a guide message is displayed to input information through the display unit 150.

The control unit 160 displays a guidance message on the display unit 150 to load the container in the mass measuring unit 120 and controls the calculating unit 140 to calculate the pressure when the mass measurement is completed. When the calculation of the calculation unit 140 is completed, the calculated pressure is controlled to be displayed on the display unit 150. [

A pressure measuring process of the gas pressure measuring instrument 100 according to the present invention having such a configuration will be described with reference to FIGS. 1 and 2. FIG.

As shown in FIG. 1, the operator carries the container A containing the gas B desired for pressure measurement and moves to the gas pressure gauge 100. Then, a pressure measurement start button (not shown) provided in the input unit 110 is operated.

A message is displayed via the display unit 150 to input information required for pressure measurement. Accordingly, the operator can determine the type of the gas B desired to measure the pressure, the volume or the volume of the container A in which the gas B is accommodated, the mass of the container A alone, the temperature at the time of measurement, Lt; / RTI >

When the operator does not know the mass of the entire container including the gas, the container A is loaded on the mass measuring part 120 and the mass is measured.

When the mass measurement is completed, the calculation unit 140 calculates the pressure of the gas by substituting the information input through the input unit 110 and the information stored in the storage unit 130 into the ideal gas state equation.

For example, in order to measure the pressure of the N 2 gas charged in the 47 liter container, the gas name, the capacity of the container, and the current temperature are input to the input unit 110. At this time, if the total mass of the container measured through the mass measuring part 120 is 52 kg, the present temperature is 20 캜, the compression coefficient is 1, and the mass of the container and the valve other than the gas is 51 kg,

Accordingly, P (pressure) = (1 x (1000 / 28.01348) x 0.082 x 293.15) / 47 = 18.25 atm

The pressure 18.25 atm calculated by the calculation unit 140 is displayed on the display unit 150, and the operator can know the pressure of the gas.

As described above, the gas pressure measuring apparatus according to the present invention can calculate the gas pressure simply by using the gas specific mass and the ideal gas state equation. Accordingly, it is possible to reduce the labor required for measuring the pressure of the gas and shorten the working time, thereby increasing the work efficiency.

Further, since the gas can be measured in a state in which the gas is accommodated in the vessel without directly contacting with the gas, there is no waste gas and it is economical and safety of the operator can be guaranteed.

The embodiments of the gas pressure gauge of the present invention described above are merely illustrative and those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. It will be possible. Therefore, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

100: gas pressure measuring instrument 110: input part
120: mass measuring unit 130:
140: Calculator 150: Display
160: control unit 170:
171: Body support shaft

Claims (2)

A mass measuring unit for measuring the total mass of the container housing the gas;
An input unit for inputting the type of the gas, the volume of the container, the mass of the container excluding the gas, the current temperature, and the total mass measured by the mass measuring unit;
A storage unit for storing gas constants, molecular weights and compression coefficients for each gas type;
A calculation unit for calculating a pressure of the gas based on the values input through the input unit and the gas constants stored in the storage unit;
A display unit for displaying the pressure of the gas calculated by the calculation unit;
And a control unit for controlling the display unit so that the calculating unit calculates the pressure of the gas based on the value input from the input unit and displays the calculated pressure of the gas,
Wherein the calculating unit calculates the pressure of the gas based on the ideal gas state equation PV = ZnRT.
The method according to claim 1,
Wherein the input unit, the storage unit, the calculating unit, the display unit, and the control unit are accommodated in the main body,
Wherein the mass measuring unit is horizontally disposed on a floor surface,
Wherein the main body is coupled to a support shaft disposed perpendicularly to the mass measurement part.
KR1020160006489A 2016-01-19 2016-01-19 Non-contact type gas pressure measuring device KR101651800B1 (en)

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Application Number Priority Date Filing Date Title
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060108318A (en) * 2005-04-12 2006-10-17 한국오발주식회사 Flux operator for correcting the temperature and pressure of gas
KR20090105979A (en) * 2004-11-30 2009-10-07 마이크로 모우션, 인코포레이티드 Method and apparatus for determining flow pressure using density information
KR20100029177A (en) * 2007-01-26 2010-03-16 엘렉트리씨트 드 프랑스 Method for measuring the pressure and/or molar mass of a gas in a housing, and corresponding measurement assembly
KR101199105B1 (en) * 2012-05-30 2012-11-08 윤정중 gas discharge measuring program and its measuring method
KR20140002056U (en) 2012-09-25 2014-04-08 한국전력공사 Pressure gauge

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090105979A (en) * 2004-11-30 2009-10-07 마이크로 모우션, 인코포레이티드 Method and apparatus for determining flow pressure using density information
KR20060108318A (en) * 2005-04-12 2006-10-17 한국오발주식회사 Flux operator for correcting the temperature and pressure of gas
KR20100029177A (en) * 2007-01-26 2010-03-16 엘렉트리씨트 드 프랑스 Method for measuring the pressure and/or molar mass of a gas in a housing, and corresponding measurement assembly
KR101199105B1 (en) * 2012-05-30 2012-11-08 윤정중 gas discharge measuring program and its measuring method
KR20140002056U (en) 2012-09-25 2014-04-08 한국전력공사 Pressure gauge

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