CN112857503A - Small-flow gas volume flow measuring device - Google Patents
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- CN112857503A CN112857503A CN202110021319.2A CN202110021319A CN112857503A CN 112857503 A CN112857503 A CN 112857503A CN 202110021319 A CN202110021319 A CN 202110021319A CN 112857503 A CN112857503 A CN 112857503A
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- G01F22/00—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for
- G01F22/02—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for involving measurement of pressure
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Abstract
本发明提供了一种小流量气体体积流量测量装置，包括第一管路气阻、第二管路气阻、第三管路气阻、第四管路气阻、第五管路气阻和检测组，第一管路气阻两端分别连接气体入口和气体出口，第二管路气阻入口端连接在第一管路气阻入口端，第三管路气阻入口端连接第一管路气阻出口端，第四管路气阻入口端连接第二管路气阻出口端，第五管路气阻入口端连接第三管路气阻出口端，检测组用于检测管路气阻出口压力、工作环境的大气压力和温度。本装置可以测量微升/分钟及以下流量的气体体积流量；测量有腐蚀性气体的体积流量；高压力下测量微升/分钟及以下流量气体体积值。
The invention provides a low-flow gas volume flow measurement device, comprising a first pipeline air resistance, a second pipeline air resistance, a third pipeline air resistance, a fourth pipeline air resistance, a fifth pipeline air resistance and a In the detection group, the two ends of the air resistance of the first pipeline are respectively connected to the gas inlet and the gas outlet, the inlet end of the air resistance of the second pipeline is connected to the inlet end of the air resistance of the first pipeline, and the inlet end of the air resistance of the third pipeline is connected to the first pipe The outlet end of the air resistance of the pipeline, the inlet end of the air resistance of the fourth pipeline is connected to the outlet end of the air resistance of the second pipeline, the inlet end of the air resistance of the fifth pipeline is connected to the outlet end of the air resistance of the third pipeline, and the detection group is used to detect the air resistance of the pipeline. Resist outlet pressure, atmospheric pressure and temperature of the working environment. The device can measure the gas volume flow of microliter/min and below; measure the volume flow of corrosive gas; measure the gas volume value of microliter/min and below under high pressure.
Description
Technical Field
The invention relates to the field of gas volume flow measuring devices, in particular to a small-flow gas volume flow measuring device.
Background
In the synthesis reaction of the medical intermediate, a synthesis reaction for adding hydrogen bonds to certain substance molecules is often used, the hydrogenation reaction commonly used in China at present adopts a reaction kettle mode, the mode is low in efficiency and has great potential safety hazards for personnel and equipment, the full-automatic hydrogenation instrument based on the microreactor is adopted for hydrogenation reaction, the potential safety hazards are eliminated, the efficiency is improved, the precision of a gas volume flow measuring device of the microreactor in the existing full-automatic hydrogenation instrument has great influence on the reaction result, and a device which is adapted to the full-automatic hydrogenation instrument and used for detecting low-flow gas is absent at present;
in addition, in the catalyst evaluation system, in order to judge the effectiveness of the catalyst, accurate measurement before and after the reaction of the substances is the basis of evaluation, in this case, various gases such as oxygen, carbon dioxide, hydrogen, ammonia and the like participate in the evaluation of the catalyst, and at the moment, the use amount of the gases is accurately measured, so that important data support is improved for the evaluation of the catalyst.
The existing gas measuring device adopts a thermal principle, if the flow rate is very small, the useful signal can be submerged by thermal noise, and particularly, when the volume flow rate is in a microliter/minute level, the measurement cannot be realized; secondly, also for reasons of principle, the measuring element needs to be in contact with the measuring medium and cannot be protected from the surface, so that gases with certain corrosiveness cannot be measured.
The prior patent CN206002156U discloses a differential pressure type electronic flowmeter, which belongs to the field of flowmeters and comprises a main body, a front cover plate, a gas resistance tube, a differential pressure sensor and an electrical module; the main body is provided with a first cavity and a second cavity; the front cover plate is hermetically arranged at the ports of the first cavity and the second cavity and is provided with an air inlet and an air outlet; the main body is provided with a first pore passage and a second pore passage; one ends of the first pore passage and the second pore passage are respectively communicated with the first cavity and the second cavity, and the other ends of the first pore passage and the second pore passage are connected through an air resistance pipe; the differential pressure sensor is connected with the electrical module, and the air inlet and the air outlet of the differential pressure sensor are respectively communicated with the first pore channel and the second pore channel. This differential pressure formula electronic flowmeter is through circulating route and differential pressure sensor and the electric module that sets up on the main part, not only makes the fluid flow through first cavity and second cavity after, and the steady that the velocity of flow becomes has improved flow measurement's accuracy, and it still has advantages such as the structure is small and exquisite, simple, low cost moreover.
But the air resistance pipeline can not bear high pressure; if the differential pressure sensor can meet the requirement of a dynamic range, the requirement of high-precision resolution cannot be met, namely small flow cannot be accurately measured; outlet pressure is not measured, because the gas is influenced by pressure, the volume change of the gas is huge, and the actual flow cannot be accurately measured under the condition that the outlet pressure is unknown; the problem of the measured gas is not measured, and the volume change of the gas is huge after the gas is heated according to a gas equation; based on the above characteristics, the flow meter disclosed in this patent cannot accurately provide small volume gas flow data.
There is a need for a small flow gas volume flow measurement device that can solve the above problems.
Disclosure of Invention
The invention aims to solve the problem that a single pressure acquisition unit cannot meet the measurement precision under the condition of ensuring a dynamic range when the pressure is higher in the prior art, and provides a small-flow gas volume flow measuring device.
The invention provides a small-flow gas volume flow measuring device which comprises a first pipeline air resistance, a second pipeline air resistance, a third pipeline air resistance, a fourth pipeline air resistance, a fifth pipeline air resistance and a detection group, wherein the inlet end of the first pipeline air resistance is connected with a gas inlet, the outlet end of the first pipeline air resistance is connected with a gas outlet, the inlet end of the second pipeline air resistance is connected with the inlet end of the first pipeline air resistance, the outlet end of the second pipeline air resistance is connected with the inlet end of the fourth pipeline air resistance, the inlet end of the third pipeline air resistance is connected with the outlet end of the first pipeline air resistance, the outlet end of the third pipeline air resistance is connected with the inlet end of the fifth pipeline air resistance, and the detection group is used for detecting the pressure of the second pipeline air resistance, the pressure of the third pipeline air resistance, and the atmospheric pressure and the temperature of the current.
The invention relates to a small-flow gas volume flow measuring device, which is a preferable mode, wherein a detection group comprises a first pressure acquisition unit, a second pressure acquisition unit, a signal acquisition and data processing unit, a third pressure acquisition unit and a temperature sensor, the first pressure acquisition unit is arranged between the air resistance outlet end of a second pipeline and the air resistance inlet end of a fourth pipeline, the second pressure acquisition unit is arranged between the air resistance outlet end of the third pipeline and the air resistance inlet end of a fifth pipeline, and the signal acquisition and data processing unit is respectively and electrically connected with the first pressure acquisition unit, the second pressure acquisition unit, the third pressure acquisition unit and the temperature sensor.
The invention relates to a small-flow gas volume flow measuring device, which is a preferable mode, wherein a signal acquisition and data processing unit is used for processing data transmitted by a first pressure acquisition unit, a second pressure acquisition unit, a third pressure acquisition unit and a temperature sensor, a first pressure acquisition degree unit is arranged between the air resistance outlet end of a second pipeline and the air resistance inlet end of a fourth pipeline, the first pressure acquisition unit is used for acquiring the pressure at the air resistance outlet end of the second pipeline, the second pressure acquisition unit is arranged between the air resistance of the third pipeline and the air resistance of a fifth pipeline, the second pressure acquisition unit is used for acquiring the pressure at the air resistance outlet end of the third pipeline, and the third pressure acquisition unit is used for acquiring the ambient pressure.
According to the small-flow gas volume flow measuring device, as a preferable mode, the second pipeline gas resistance value is larger than the fourth pipeline gas resistance value, and the third pipeline gas resistance value is larger than the fifth pipeline gas resistance value.
The invention relates to a small-flow gas volume flow measuring device, which is a preferable mode, and a signal acquisition and data processing unit processes acquired data as follows:
s1, the signal acquisition and data processing unit receives the pressure P1 collected by the first pressure acquisition unit, the pressure P2 collected by the second pressure acquisition unit, the pressure P0 collected by the third pressure acquisition unit and the temperature t1 collected by the temperature sensor, the air resistance temperature t4 of the first pipeline, and the air resistance temperature t5 of the fifth pipeline;
s2, calculating the fourth pipeline air resistance flow F4, wherein the formula is as follows:
F4＝[K*r4^4*(p1^2–p0^2)]/(t4*L4*Y)
wherein r4 is the fourth pipeline air resistance inner diameter, L4 is the fourth pipeline air resistance length, Y is the viscosity parameter of the gas, and K is the fluid mechanics Poiseuille equation constant;
s3, calculating the inlet pressure p10 of the second pipeline air resistance, wherein the formula is as follows:
p10＝sqrt((F4*Y*L2)/(K*r2^2)+p1)
wherein, L2 is the second pipeline air resistance inner diameter, L2 is the second pipeline air resistance length;
s4, calculating the fifth pipeline air resistance flow F5, wherein the formula is as follows:
F5＝[K*r5^4*(p2^2–p0^2)]/(t5*L5*Y)
wherein r5 is the fifth pipeline air resistance inner diameter, and L5 is the fifth pipeline air resistance length;
s5, calculating the inlet pressure p20 of the third pipeline air resistance, wherein the formula is as follows:
p20＝sqrt((F5*Y*L3)/(K*r3^2)+p2)
wherein r3 is the inner diameter of the third pipeline air lock, and L3 is the length of the third pipeline air lock;
s6, calculating the gas volume flow F1 of the first pipeline gas resistance, wherein the formula is as follows:
F1＝[K*r1^4*(p20^2–p10^2)]/(t1*L1*Y)
wherein r1 is the first pipeline air resistance inner diameter, and L1 is the first pipeline air resistance length;
s7, calculating the gas volume flow F0 of the outflow device, wherein the formula is as follows:
F0＝F1–F3；
and S8, outputting a detection result F0.
The device has the following specific principle: gas flows into this device through the entry, can carry out pressure acquisition on first pressure acquisition unit when second pipeline air-resistor and fourth pipeline air-resistor, it is r4 respectively to know the internal diameter and the length of fourth pipeline air-resistor that flows through this moment according to the design, L4, the pressure of gathering through first pressure acquisition unit is p1, the gas temperature of the fourth pipeline air-resistor that temperature acquisition unit gathered is t4, the atmospheric pressure of current environment is p0, then the flow F4 of fourth pipeline air-resistor that flows through can be derived by the fluid mechanics equation:
F4＝[K*r4^4*(p1^2–p0^2)]/(t4*L4*Y)
wherein Y is the viscosity parameter of the gas.
Because the second pipeline air resistance and the fourth pipeline air resistance are in series connection, the air flow F2 of the second pipeline air resistance and the air flow of the fourth pipeline air resistance are opposite, namely
F4＝F2
According to the design, the inner diameter r2 and the length L2 of the second pipeline air resistor are known, the outlet pressure of the second pipeline air resistor is acquired by the first pressure acquisition unit, the temperature t2 of the gas in the pipeline air resistor is acquired by the temperature acquisition unit, and the inlet pressure p10 of the second pipeline air resistor can be obtained by a fluid mechanics equation:
p10＝sqrt((F2*Y*L2)/(K*r2^2)+p1)
similarly, the inner diameter r3 and the length L3 of the third pipeline gas resistor are known, the temperature t3 of the third pipeline gas resistor is measured by the temperature acquisition unit, and the outlet pressure is p 2; the fifth pipeline has the gas resistance inner diameter r5, the length L5, the internal gas temperature t5, the outlet pressure p0, the inlet pressure p2 and the flow F5:
F5＝[K*r5^4*(p2^2–p0^2)]/(t5*L5*Y)
because the flow rate of the third pipeline air resistance is equal to that of the fifth pipeline air resistance
F3＝F5
The inlet pressure p20 of the third line vapor lock is therefore:
p20＝sqrt((F3*Y*L3)/(K*r3^2)+p2)
for the first pipeline gas resistor, the length of the first pipeline gas resistor is L1, the inner diameter of the first pipeline gas resistor is r1, the inlet pressure and the outlet pressure of the first pipeline gas resistor are p10 and p20 respectively, the temperature of gas flowing through the first pipeline gas resistor is measured by a temperature acquisition unit to be t1, and the gas volume flow rate F1 of the first pipeline gas resistor is as follows:
F1＝[K*r1^4*(p20^2–p10^2)]/(t1*L1*Y)
the gas volume flow out of the device F0 was:
F0＝F1–F3
this device passes through hydrodynamics pouseye law, adopts the not pipeline air resistance of equidimension, converts higher pressure value to and can measure with lower dynamic range pressure measurement device to improved measurement accuracy greatly, realized the flow volume flow measurement of high-pressure small gas, this device is different from the direct measurement who adopts the thermal potential field principle when high pressure, also is different from direct pressure measurement's mode, and concrete advantage is:
when the gas flow is small, the measuring device based on the thermal potential field principle has great noise, so that high-precision data cannot be provided for the gas with small flow;
the measuring device of the direct pressure measurement principle has the advantages that the pressure is high, so that the sensor has a large dynamic range, the precision of a small numerical value is necessarily lost due to the large dynamic range, and accurate small-flow measurement cannot be provided.
The invention has the following beneficial effects:
(1) gas volume flow rates of microliter/minute and below can be measured;
(2) measuring the volume flow of the corrosive gas;
(3) gas volume values were measured at high pressures at and below flow rates of microliters/minute.
Drawings
FIG. 1 is a schematic view of a small flow gas volumetric flow measurement device;
fig. 2 is a schematic view of a detection group of a small flow gas volume flow measuring device.
Reference numerals:
1. a first pipeline air lock; 2. a second pipeline air resistance; 3. a third pipeline air resistance; 4. a fourth pipeline air lock; 5. a fifth pipeline air resistance; 6. a detection group; 61. a first pressure acquisition unit; 62. a second pressure acquisition unit; 63. a signal acquisition and data processing unit; 64. a third pressure acquisition unit; 65. a temperature sensor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
As shown in fig. 1, a small-flow gas volume flow measuring device includes a first pipeline air resistor 1, a second pipeline air resistor 2, a third pipeline air resistor 3, a fourth pipeline air resistor 4, a fifth pipeline air resistor 5 and a detection group 6, wherein an inlet end of the first pipeline air resistor 1 is connected with a gas inlet, an outlet end of the first pipeline air resistor 1 is connected with a gas outlet, an inlet end of the second pipeline air resistor 2 is connected with an inlet end of the first pipeline air resistor 1, an outlet end of the second pipeline air resistor 2 is connected with an inlet end of the fourth pipeline air resistor 4, an inlet end of the third pipeline air resistor 3 is connected with an outlet end of the first pipeline air resistor 1, an outlet end of the third pipeline air resistor 3 is connected with an inlet end of the fifth pipeline air resistor 5, and the detection group 6 is used for detecting an outlet pressure of the second pipeline air resistor 2, an outlet pressure of the third pipeline air resistor 3, and an atmospheric pressure and a temperature.
As shown in fig. 2, the detection group 6 includes a first pressure acquisition unit 61, a second pressure acquisition unit 62, a signal acquisition and data processing unit 63, a third pressure acquisition unit 64 and a temperature sensor 65, the first pressure acquisition unit 61 is disposed between the outlet end of the second pipeline air resistor 2 and the inlet end of the fourth pipeline air resistor 4, and the second pressure acquisition unit 62 is disposed between the outlet end of the third pipeline air resistor 3 and the inlet end of the fifth pipeline air resistor 5. The signal acquisition and data processing unit 63 is used for processing the data transmitted by the first pressure acquisition unit 61, the second pressure acquisition unit 62, the third pressure acquisition unit 64 and the temperature sensor 65, the first pressure acquisition unit 61 is arranged between the outlet end of the second pipeline air resistor 2 and the inlet end of the fourth pipeline air resistor 4, the first pressure acquisition unit 61 is used for acquiring the pressure at the outlet end of the second pipeline air resistor 2, the second pressure acquisition unit 62 is arranged between the third pipeline air resistor 3 and the fifth pipeline air resistor 5, the second pressure acquisition unit 62 is used for acquiring the pressure at the outlet end of the third pipeline air resistor 3, and the third pressure acquisition unit 64 is used for acquiring the ambient pressure.
The signal acquisition and data processing unit 63 processes the acquired data as follows:
s1, the signal acquisition and data processing unit 63 receives the pressure P1 acquired by the first pressure acquisition unit 61, the pressure P2 acquired by the second pressure acquisition unit 62, the pressure P0 acquired by the third pressure acquisition unit 64 and the temperature t1 acquired by the temperature sensor 65 of the first pipeline air resistance 1, the temperature t4 of the fourth pipeline air resistance 4 and the temperature t5 of the fifth pipeline air resistance 5;
s2, calculating the fourth pipeline air resistance 4 flow F4, wherein the formula is as follows:
F4＝[K*r4^4*(p1^2–p0^2)]/(t4*L4*Y)
wherein r4 is the inner diameter of the fourth pipeline air resistance 4, L4 is the length of the fourth pipeline air resistance 4, Y is the viscosity parameter of the gas, and K is the fluid mechanics Poiseuille equation constant;
s3, calculating the inlet pressure p10 of the second pipeline air resistance 2, wherein the formula is as follows:
p10＝sqrt((F4*Y*L2)/(K*r2^2)+p1)
wherein, L2 is the inner diameter of the second pipeline air resistor 2, and L2 is the length of the second pipeline air resistor 2;
s4, calculating the flow F5 of the fifth pipeline air resistance 5, wherein the formula is as follows:
F5＝[K*r5^4*(p2^2–p0^2)]/(t5*L5*Y)
wherein r5 is the inner diameter of the fifth pipeline air lock 5, and L5 is the length of the fifth pipeline air lock 5;
s5, calculating the inlet pressure p20 of the third pipeline air resistance 3, wherein the formula is as follows:
p20＝sqrt((F5*Y*L3)/(K*r3^2)+p2)
wherein r3 is the inner diameter of the third pipeline air resistor 3, and L3 is the length of the third pipeline air resistor 3;
s6, calculating the gas volume flow F1 of the first pipeline gas resistance 1, wherein the formula is as follows:
F1＝[K*r1^4*(p20^2–p10^2)]/(t1*L1*Y)
wherein r1 is the inner diameter of the first pipeline air resistor 1, and L1 is the length of the first pipeline air resistor 1;
s7, calculating the gas volume flow F0 of the outflow device, wherein the formula is as follows:
F0＝F1–F3；
and S8, outputting a detection result F0.
The flow meter principle is based on the fluid mechanics Poiseuille equation, and under the condition that gas does not leak or the leakage amount is known, the gas flows through the first pipeline of the device and then provides a certain flow of gas for other equipment at the back, and the gas volume flow can be obtained only by measuring each parameter in the Poiseuille equation;
the second pipeline air resistance 2 and the fourth pipeline air resistance 5 in the device are designed for measuring the inlet pressure of the first pipeline air resistance 1, namely under the condition of higher gas pressure, the second pipeline air resistance 2 is the pipeline air resistance with larger air resistance value, the fourth pipeline air resistance 4 connected with the second pipeline air resistance 2 in series is the pipeline air resistance with smaller air resistance value, the Poisbee equation shows that under the condition of same gas flow, the second pipeline air resistance 2 can generate larger air pressure drop, so that the low-range pressure detection device can be used for measuring the air pressure drop generated by the gas flowing through a certain flow rate from the fourth pipeline air resistance 4 before the fourth pipeline air resistance 4, thus higher measurement precision can be realized, because the requirement on the dynamic range of the pressure detection device is very low (the dynamic range and the resolution ratio are two mutually exclusive indexes of a sensor), the outlet of the fourth pipeline air resistance 4 is communicated with the atmosphere, thus, by measuring the external atmospheric pressure and the temperature of the gas in the fourth pipeline gas resistor 4, adding the known length and inner diameter of the pipeline gas resistor and the like, the flow F4 of the fourth pipeline gas resistor can be obtained through the Poiseul equation, the flow F4 is also the flow of the second pipeline gas resistor, the temperature of the gas in the second pipeline gas resistor measured through the known length and inner diameter of the second pipeline and the temperature measuring unit can be obtained through the Poiseul equation, and the pressure of the inlet of the first pipeline gas resistor can be obtained;
by the reasoning, the volume flow F5 flowing through the third pipeline gas resistor 3 and the fifth pipeline gas resistor 5 can be obtained through the fifth pipeline gas resistor 5 and the second pressure acquisition unit 62, the outlet pressure of the first pipeline gas resistor 1 can be obtained through the F5 and the third pipeline gas resistor 3, and the gas temperature in the first pipeline gas resistor 1 measured by the temperature acquisition unit can be used for obtaining the gas volume flow F1 flowing through the first pipeline gas resistor through the Poiseuille equation;
since the volume flow F5 of the third line gas lock is known, the actual flow F is F1-F5, so far we have obtained the volume flow of gas out of the device of the invention.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6568282B1 (en) * | 1999-02-26 | 2003-05-27 | United States Filter Corporation | Method and apparatus for evaluating a membrane |
| CN2660489Y (en) * | 2003-12-19 | 2004-12-01 | 张朝明 | Differential low voltage micro airflow sensor |
| RU102994U1 (en) * | 2010-04-13 | 2011-03-20 | Феликс Эргардович Гофман | DEVICE FOR MEASURING THE LEVEL OR DENSITY OF A LIQUID |
| CN206709908U (en) * | 2017-05-24 | 2017-12-05 | 青岛众瑞智能仪器有限公司 | A kind of elbow meter |
| CN208366394U (en) * | 2018-05-28 | 2019-01-11 | 湖南三德科技股份有限公司 | A kind of vapour lock flow regulator for elemental analyser |
-
2021
- 2021-01-08 CN CN202110021319.2A patent/CN112857503B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6568282B1 (en) * | 1999-02-26 | 2003-05-27 | United States Filter Corporation | Method and apparatus for evaluating a membrane |
| CN2660489Y (en) * | 2003-12-19 | 2004-12-01 | 张朝明 | Differential low voltage micro airflow sensor |
| RU102994U1 (en) * | 2010-04-13 | 2011-03-20 | Феликс Эргардович Гофман | DEVICE FOR MEASURING THE LEVEL OR DENSITY OF A LIQUID |
| CN206709908U (en) * | 2017-05-24 | 2017-12-05 | 青岛众瑞智能仪器有限公司 | A kind of elbow meter |
| CN208366394U (en) * | 2018-05-28 | 2019-01-11 | 湖南三德科技股份有限公司 | A kind of vapour lock flow regulator for elemental analyser |
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Effective date of registration: 20250122 Address after: Building 21, Block B, Yixing Medicinal Valley, Nanyue Village, Xinjie Street, Yixing City, Wuxi City, Jiangsu Province, China 214205 Patentee after: Oushi Sheng (Yixing) Technology Co.,Ltd. Country or region after: China Address before: 100094 101-1012, 1st floor, building 3, 103 Beiqing Road, Haidian District, Beijing Patentee before: OUSHISHENG (BEIJING) SCIENCE & TECHNOLOGY CO.,LTD. Country or region before: China |
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