CN107101688B - Laminar flow type gas flowmeter and calibration method - Google Patents
Laminar flow type gas flowmeter and calibration method Download PDFInfo
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- CN107101688B CN107101688B CN201710265856.5A CN201710265856A CN107101688B CN 107101688 B CN107101688 B CN 107101688B CN 201710265856 A CN201710265856 A CN 201710265856A CN 107101688 B CN107101688 B CN 107101688B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F9/00—Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
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Abstract
The invention belongs to the metering technology, and relates to improvement of a gas flowmeter and a calibration method of the gas flowmeter. The gas flowmeter of the present invention is characterized in that: the pressure sensor comprises a shell (1), an end cover (2), a glass cloth roll (3), a first pressure sensor (4) and a second pressure sensor (5). The calibration method comprises the following steps: determining a gaseous medium; determining a metering device; installing a calibrated laminar flow type gas flowmeter; inflating the bell-type gas flow device; and calibrating a pressure difference and flow value corresponding curve under the pressure value. The invention provides a laminar flow type gas flowmeter and a calibration method, which can be conveniently integrated with an equipment tester, and improve the measurement range and the measurement precision of the equipment tester.
Description
Technical Field
The invention belongs to the metering technology, and relates to improvement of a gas flowmeter and a calibration method of the gas flowmeter.
Background
The air tightness test of the oxygen supply system and the components thereof requires selecting a test method and a flowmeter which are adaptive to the test range. The existing orifice plate flowmeter, venturi tube flowmeter, nozzle type flowmeter and rotor flowmeter are difficult to integrate with the equipment tester, bring inconvenience for the test, in order to improve the measuring range and the measuring accuracy of the equipment tester, a gas flowmeter convenient to integrate with the equipment tester is needed.
Disclosure of Invention
The purpose of the invention is: a laminar flow type gas flowmeter and a calibration method are provided so as to be integrated with an equipment tester, and the measurement range and the measurement precision of the equipment tester are improved.
The technical scheme of the invention is as follows: a laminar flow gas flowmeter, characterized by: the device comprises a shell 1, an end cover 2, a glass cloth roll 3, a first pressure sensor 4 and a second pressure sensor 5; an outlet nozzle 1a is arranged in the center of the right end face of a shell 1, a high-pressure side pressure taking port 1b is arranged on the outer cylindrical face of the shell 1 close to the left end face, a first pressure sensor 4 is arranged on the outer cylindrical face of the shell at the high-pressure side pressure taking port 1b, a low-pressure side pressure taking port 1c is arranged on the outer cylindrical face of the shell 1, a second pressure sensor 5 is arranged on the outer cylindrical face of the shell at the low-pressure side pressure taking port 1c, an internal thread is arranged at the left end of the shell 1, the external thread of an end cover 2 is combined with the internal thread and keeps sealing, an air inlet is arranged in the center of the end cover 2, and a glass cloth roll 3 is filled in the shell 1; the distance L1 between the axis of the high-pressure-side pressure-taking port 1b and the axis of the low-pressure-side pressure-taking port 1c is 0.8L 2-0.9L 2, and L2 is the axial length of the inner cavity of the housing 1.
The calibration method of the laminar flow type gas flowmeter is characterized by comprising the following steps:
1. determining a gaseous medium;
2. determining a metering device: calibrating by using a bell-type gas flow metering device;
3. installing a calibrated laminar flow type gas flowmeter: connecting the calibrated laminar flow type gas flowmeter to a calibration system of a bell-type gas flow device;
4. inflating the bell-type gas flow device: filling a bell jar of the bell jar type gas flow standard device with a gas medium and keeping a certain pressure value, then closing an inflation pipeline, and recording the pressure value; the pressure value is the service pressure value of the calibrated laminar flow type gas flowmeter;
5. calibrating a pressure difference and flow value corresponding curve under the pressure value: opening a switch in a calibration pipeline, adjusting a flow valve to be in a flow state, allowing gas in a bell jar to flow through a calibrated laminar flow type gas flowmeter, recording the reduction amount and the used time of the volume of the gas in the bell jar, calculating a flow value of the laminar flow type gas flowmeter in the flow state, simultaneously recording a difference value of a first pressure sensor 4 and a second pressure sensor 5, wherein the difference value corresponds to the calculated flow value, and marking the difference value in a two-dimensional coordinate system as a horizontal coordinate and a flow value as a vertical coordinate as a point on a curve corresponding to the pressure difference and the flow value; and adjusting the flow valve to be in a second flow state, marking a second point on the curve corresponding to the pressure difference and the flow value according to the method, and repeating the steps, marking at least 10 points on the curve corresponding to the pressure difference and the flow value, and then smoothly connecting all the marked points to form the curve corresponding to the pressure difference and the flow value.
The invention has the advantages that: the laminar flow type gas flowmeter and the calibration method can be conveniently integrated with an equipment tester, and the measurement range and the measurement precision of the equipment tester are improved.
Drawings
Fig. 1 is a schematic structural view of a laminar flow type gas flowmeter of the present invention.
Fig. 2 is a schematic structural view of the roll of glass cloth according to the present invention.
FIG. 3 is a graph of pressure difference versus flow rate for example 1.
FIG. 4 is a graph of pressure difference versus flow rate for example 2.
Detailed Description
The present invention is described in further detail below. Referring to fig. 1 and 2, a laminar flow type gas flowmeter is characterized in that: the device comprises a shell 1, an end cover 2, a glass cloth roll 3, a first pressure sensor 4 and a second pressure sensor 5; an outlet nozzle 1a is arranged in the center of the right end face of a shell 1, a high-pressure side pressure taking port 1b is arranged on the outer cylindrical face of the shell 1 close to the left end face, a first pressure sensor 4 is arranged on the outer cylindrical face of the shell at the high-pressure side pressure taking port 1b, a low-pressure side pressure taking port 1c is arranged on the outer cylindrical face of the shell 1, a second pressure sensor 5 is arranged on the outer cylindrical face of the shell at the low-pressure side pressure taking port 1c, an internal thread is arranged at the left end of the shell 1, the external thread of an end cover 2 is combined with the internal thread and keeps sealing, an air inlet is arranged in the center of the end cover 2, and a glass cloth roll 3 is filled in the shell 1; the distance L1 between the axis of the high-pressure-side pressure-taking port 1b and the axis of the low-pressure-side pressure-taking port 1c is 0.8L 2-0.9L 2, and L2 is the axial length of the inner cavity of the housing 1.
The calibration method of the laminar flow type gas flowmeter is characterized by comprising the following steps:
1. determining a gaseous medium;
2. determining a metering device: calibrating by using a bell-type gas flow metering device;
3. installing a calibrated laminar flow type gas flowmeter: connecting the calibrated laminar flow type gas flowmeter to a calibration system of a bell-type gas flow device;
4. inflating the bell-type gas flow device: filling a bell jar of the bell jar type gas flow standard device with a gas medium and keeping a certain pressure value, then closing an inflation pipeline, and recording the pressure value; the pressure value is the service pressure value of the calibrated laminar flow type gas flowmeter;
5. calibrating a pressure difference and flow value corresponding curve under the pressure value: opening a switch in a calibration pipeline, adjusting a flow valve to be in a flow state, allowing gas in a bell jar to flow through a calibrated laminar flow type gas flowmeter, recording the reduction amount and the used time of the volume of the gas in the bell jar, calculating a flow value of the laminar flow type gas flowmeter in the flow state, simultaneously recording a difference value of a first pressure sensor 4 and a second pressure sensor 5, wherein the difference value corresponds to the calculated flow value, and marking the difference value in a two-dimensional coordinate system as a horizontal coordinate and a flow value as a vertical coordinate as a point on a curve corresponding to the pressure difference and the flow value; and adjusting the flow valve to be in a second flow state, marking a second point on the curve corresponding to the pressure difference and the flow value according to the method, and repeating the steps, marking at least 10 points on the curve corresponding to the pressure difference and the flow value, and then smoothly connecting all the marked points to form the curve corresponding to the pressure difference and the flow value.
The glass cloth roll 3 is made of JC170-73 glass cloth.
The axial length L2 of the inner cavity of the housing 1 is 300mm to 400 mm.
In example 1, the distance L1 between the axis of the high-pressure-side pressure tap 1b and the axis of the low-pressure-side pressure tap 1c was 240mm, and L2 was 300 mm.
1. Determining that the gas medium is oxygen;
2. determining a metering device: calibrating by using a bell-type gas flow metering device;
3. installing a calibrated laminar flow type gas flowmeter;
4. inflating the bell-type gas flow device: filling a bell jar of the bell jar type gas flow standard device with a gas medium and keeping the pressure value at 0.1 MPa;
5. calibrating a pressure difference and flow value corresponding curve under the pressure value: opening a switch in a calibration pipeline, adjusting a flow valve to be in a flow state, allowing gas in a bell jar to flow through a calibrated laminar flow type gas flowmeter, recording the reduction amount and the used time of the volume of the gas in the bell jar, calculating a flow value of the laminar flow type gas flowmeter in the flow state, simultaneously recording a difference value of a first pressure sensor 4 and a second pressure sensor 5, wherein the difference value corresponds to the calculated flow value, and marking the difference value in a two-dimensional coordinate system as a horizontal coordinate and a flow value as a vertical coordinate as a point on a curve corresponding to the pressure difference and the flow value; and adjusting the flow valve to be in a second flow state, marking a second point on the curve corresponding to the pressure difference and the flow value according to the method, and repeating the steps, marking at least 10 points on the curve corresponding to the pressure difference and the flow value, and then smoothly connecting all the marked points to form the curve corresponding to the pressure difference and the flow value, which is shown in figure 3.
In example 2, the distance L1 between the axis of the high pressure side pressure tap 1b and the axis of the low pressure side pressure tap 1c was 360mm, and L2 was 400 mm.
1. Determining that the gas medium is air;
2. determining a metering device: calibrating by using a bell-type gas flow metering device;
3. installing a calibrated laminar flow type gas flowmeter;
4. inflating the bell-type gas flow device: filling a bell jar of the bell jar type gas flow standard device with a gas medium and keeping the pressure value at 0.1 MPa;
5. calibrating a pressure difference and flow value corresponding curve under the pressure value: opening a switch in a calibration pipeline, adjusting a flow valve to be in a flow state, allowing gas in a bell jar to flow through a calibrated laminar flow type gas flowmeter, recording the reduction amount and the used time of the volume of the gas in the bell jar, calculating a flow value of the laminar flow type gas flowmeter in the flow state, simultaneously recording a difference value of a first pressure sensor 4 and a second pressure sensor 5, wherein the difference value corresponds to the calculated flow value, and marking the difference value in a two-dimensional coordinate system as a horizontal coordinate and a flow value as a vertical coordinate as a point on a curve corresponding to the pressure difference and the flow value; and adjusting the flow valve to be in a second flow state, marking a second point on the curve corresponding to the pressure difference and the flow value according to the method, and repeating the steps, marking at least 10 points on the curve corresponding to the pressure difference and the flow value, and then smoothly connecting all the marked points to form the curve corresponding to the pressure difference and the flow value, which is shown in figure 4.
Claims (4)
1. The utility model provides a laminar flow type gas flowmeter for improve oxygen system and its part gas tightness test equipment tester's measuring range and measurement accuracy, its characterized in that: the device comprises a shell (1), an end cover (2), a glass cloth roll (3), a first pressure sensor (4) and a second pressure sensor (5); an outlet nozzle (1a) is arranged in the center of the right end face of the shell (1), a high-pressure side pressure taking opening (1b) is arranged on the outer cylindrical face of the shell (1) close to the left end face, a first pressure sensor (4) is arranged on the outer cylindrical face of the shell at the high-pressure side pressure taking opening (1b), a low-pressure side pressure taking opening (1c) is arranged on the outer cylindrical face of the shell at the low-pressure side pressure taking opening (1c), an internal thread is arranged at the left end opening of the shell (1), an external thread of the end cover (2) is combined with the internal thread and keeps sealing, an air inlet is arranged in the center of the end cover (2), and a glass cloth roll (3) is filled in the shell (1); the distance L1 between the axis of the high-pressure side pressure taking port (1b) and the axis of the low-pressure side pressure taking port (1c) is 0.8L 2-0.9L 2, and L2 is the axial length of the inner cavity of the shell (1).
2. The method of calibrating a laminar flow-type gas flowmeter according to claim 1, characterized by the steps of calibrating:
2.1, determining a gas medium;
2.2, determining a metering device: calibrating by using a bell-type gas flow metering device;
2.3, installing a calibrated laminar flow type gas flowmeter: connecting the calibrated laminar flow type gas flowmeter to a calibration system of a bell-type gas flow device;
2.4, inflating the bell-type gas flow device: filling a bell jar of the bell jar type gas flow standard device with a gas medium and keeping a certain pressure value, then closing an inflation pipeline, and recording the pressure value; the pressure value is the service pressure value of the calibrated laminar flow type gas flowmeter;
2.5, calibrating a pressure difference and flow value corresponding curve under the pressure value: opening a switch in a calibration pipeline, adjusting a flow valve to be in a flow state, allowing gas in a bell jar to flow through a calibrated laminar flow type gas flowmeter, recording the reduction amount and the used time of the volume of the gas in the bell jar, calculating a flow value of the laminar flow type gas flowmeter in the flow state, simultaneously recording a difference value of a first pressure sensor (4) and a second pressure sensor (5), wherein the difference value corresponds to the calculated flow value, and the difference value is taken as a horizontal coordinate and a flow value as a vertical coordinate and is marked in a two-dimensional coordinate system as a point on a curve corresponding to the pressure difference and the flow value; and adjusting the flow valve to be in a second flow state, marking a second point on the curve corresponding to the pressure difference and the flow value according to the method, and repeating the steps, marking at least 10 points on the curve corresponding to the pressure difference and the flow value, and then smoothly connecting all the marked points to form the curve corresponding to the pressure difference and the flow value.
3. The laminar flow type gas flowmeter according to claim 1, characterized in that: the glass cloth roll (3) is made of JC170-73 glass cloth.
4. The laminar flow type gas flowmeter according to claim 1 or 3, characterized in that: the axial length L2 of the inner cavity of the shell (1) is 300-400 mm.
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| CN201710265856.5A CN107101688B (en) | 2017-04-21 | 2017-04-21 | Laminar flow type gas flowmeter and calibration method |
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Address after: No. 35, Yan'an Road, Baohe Industrial Park, Hefei, Anhui 230051 Patentee after: Hefei Jianghang Aircraft Equipment Co.,Ltd. Address before: No. 35, Yan'an Road, Baohe Industrial Park, Hefei, Anhui 230051 Patentee before: HEFEI JIANGHANG AIRCRAFT EQUIPMENT Co.,Ltd. |
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