CN110864752A - Single-pulse flow measuring device and method based on volume tube and displacement sensor - Google Patents
Single-pulse flow measuring device and method based on volume tube and displacement sensor Download PDFInfo
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- CN110864752A CN110864752A CN201911155499.2A CN201911155499A CN110864752A CN 110864752 A CN110864752 A CN 110864752A CN 201911155499 A CN201911155499 A CN 201911155499A CN 110864752 A CN110864752 A CN 110864752A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/72—Devices for measuring pulsing fluid flows
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
- G01F1/90—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure with positive-displacement meter or turbine meter to determine the volume flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/005—Valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/02—Compensating or correcting for variations in pressure, density or temperature
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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention relates to a single-pulse flow measurement standard device, in particular to a single-pulse flow measurement device and method based on a volume tube and a displacement sensor, and solves the problem that the single-pulse flow of a propellant of an attitude and orbit control engine is difficult to accurately measure. The measuring device comprises a single-pulse control unit, a single-pulse measuring unit, a conventional liquid path, a measurement and control integrated device and an upper computer; the single-pulse measuring unit comprises a displacement sensor with quick response, the displacement sensor with quick response is placed in a calibrated volume tube, and the height change of the liquid level in the volume tube is measured by the displacement sensor; the sectional area of the volume pipe is known, the area is multiplied by the height difference, namely the volume change quantity, the sectional area of the volume pipe is equal everywhere, so the flow measurement is finally converted into the measurement of the liquid level height, and the single pulse flow of the propellant can be rapidly measured by the scheme.
Description
Technical Field
The invention relates to a single-pulse flow measurement standard device, in particular to a single-pulse flow measurement standard device and a single-pulse flow measurement standard method based on a volume tube and a displacement sensor. The standard flow measurement device is simple, feasible and effective in structure.
Background
The flow parameter is a key parameter for evaluating the performance of the attitude and orbit control engine, the propellant flow is accurately measured, the performance of the engine can be accurately reflected and evaluated, and the method has important significance for accurately measuring the propellant flow. The attitude and orbit control engine is divided into two modes of continuous work and pulse work. When the engine is operated in a continuous mode, the flow is a steady state flow; when the engine is operating in the pulse mode, it is the pulse flow rate.
At present, the pulse flow measurement of the attitude control engine mainly adopts a mass flow meter method and a static mass method;
the mass flowmeter is adopted for pulse flow measurement, and because the electrical signal output of the common mass flowmeter cannot respond in time, the steady-state measurement result is used for replacing the pulse flow measurement result, so that the measurement error is very large, the flow response curve at the moment of starting the engine cannot be obtained in time, and the fault analysis and diagnosis cannot be carried out.
The pulse flow is greatly influenced by the response time of the solenoid valve switch. When the average pulse flow is measured by a static mass method, a plurality of flow pulses are continuously output by rapidly opening and closing the electromagnetic valve, the mass of the propellant is weighed by an electronic balance, and a timer is used for timing. Since the response time of each solenoid valve is different, for example, when the pulse width is 50ms, the state of the solenoid valve may be fully opened, 3/4 opened, or half opened, and the pulse flow rate is greatly affected by the opening degree of the solenoid valve.
Disclosure of Invention
In order to solve the problem that the single pulse flow of the attitude and orbit control engine propellant is difficult to accurately measure, the invention provides a single pulse flow measurement standard device and a single pulse flow measurement standard method based on a volume tube and a displacement sensor, and the problem of accurately measuring the single pulse flow of the attitude and orbit control engine propellant is solved.
The technical scheme of the invention is to provide a single-pulse flow measuring device based on a volume tube and a displacement sensor, which is characterized in that: the device comprises a single-pulse control unit, a single-pulse measuring unit, a conventional liquid path, a measurement and control integrated device and an upper computer;
the single-pulse control unit comprises a gas cylinder, a pressure reducing valve, a storage tank, an electromagnetic valve and a quick response electromagnetic valve which are sequentially arranged along a pipeline; inert gas is filled in the gas cylinder; the storage tank is internally provided with a medium to be detected;
the single-pulse measuring unit comprises a first valve, a volume pipe and a displacement sensor arranged in the volume pipe, and the displacement sensor is used for acquiring the height change of the liquid level of a medium in the volume pipe; the inlet end of the first valve is connected with the outlet end of the quick response electromagnetic valve, and the outlet end of the first valve is connected with the liquid inlet of the volume pipe;
the conventional liquid path comprises a second valve and an orifice plate, wherein the inlet end of the second valve is connected with the outlet end of the quick response electromagnetic valve, and the outlet end of the second valve is connected with the orifice plate;
the measurement and control integrated device is used for controlling the on-off of the electromagnetic valve, the quick response electromagnetic valve, the first valve and the second valve, collecting data of the displacement sensor and sending the data to an upper computer;
the upper computer comprises a memory and a processor, a computer program is stored in the memory, and when the computer program is executed by the processor, the received data is processed to obtain the monopulse mass flow qM：
Wherein S is the sectional area of the volume tube; Δ L is the liquid level height change; t is time; and rho is the density of the medium in the volume tube.
Furthermore, in order to measure the temperature and the pressure in the volume pipe, the single-pulse measuring unit further comprises a pressure transmitter and a temperature transmitter which are arranged in the volume pipe.
Furthermore, the displacement sensor, the pressure transmitter and the temperature transmitter are all arranged at the top end in the volume pipe.
Further, to achieve accurate measurements, the volumetric tube cross-sectional area is equal everywhere.
Further, the volume pipe is a stainless steel pipe.
Further, the displacement sensor is a micro-pulse displacement sensor or a laser displacement sensor.
Further, the first valve and the second valve are pneumatic ball valves or manual ball valves.
Further, the inert gas is nitrogen.
The invention also provides a method for realizing single-pulse flow measurement by using the device, which comprises the following steps:
the method comprises the following steps that firstly, a measurement and control integrated device controls the on-off of an electromagnetic valve and a quick response electromagnetic valve, so that a medium in a storage tank flows out in a waveform formed by starting and closing the quick response electromagnetic valve after the medium is extruded by inert gas in a gas cylinder;
step two, when single pulse measurement is carried out, the measurement and control integrated device controls the first valve to be opened, so that the medium in the storage tank enters the volume pipe;
thirdly, measuring the change of the liquid level height in the volume tube by using a displacement sensor;
fourthly, the measurement and control integrated device collects data measured by the displacement sensor and sends the data to an upper computer;
step five, the upper computer performs the following processing on the received data to obtain the monopulse mass flow qM：
Wherein S is the sectional area of the volume tube; Δ L is the liquid level height change; t is time; and rho is the density of the medium in the volume tube.
Further, the third step also includes the process of measuring the temperature and pressure in the volume tube by using a temperature transmitter and a pressure transmitter;
the fourth step also comprises a process that the measurement and control integrated device collects temperature and pressure data measured by the temperature transmitter and the pressure transmitter;
and step five, a process of correcting the density of the medium in the volume pipe by using the temperature and pressure data is also included.
The invention has the beneficial effects that:
1. the displacement sensor with quick response is arranged in a calibrated volume tube, and the height change of the liquid level in the volume tube is measured by the displacement sensor; the sectional area of the volume pipe is known, the area is multiplied by the height difference, namely the volume change quantity, the sectional area of the volume pipe is equal everywhere, so the flow measurement is finally converted into the measurement of the liquid level height, and the single pulse flow of the propellant can be rapidly measured by the scheme.
2. The displacement sensor is a micro-pulse displacement sensor or a laser displacement sensor, meets the time response measurement requirements of single-pulse flow and transient flow, and can quickly respond to liquid level change.
3. The pressure transmitter and the temperature transmitter are also arranged in the volume pipe, so that the density of the propellant in the volume pipe can be corrected according to the pressure value and the temperature value acquired by the pressure transmitter and the temperature transmitter, and more accurate measurement data can be obtained.
Drawings
Fig. 1 is a schematic structural diagram of a single-pulse flow measuring device.
Fig. 2 is a control block diagram of the measurement and control integrated device of the single-pulse flow measuring device.
The reference numbers in the figures are: the device comprises a gas cylinder 1, a pressure reducing valve 2, a storage tank 3, a solenoid valve 4, a quick response solenoid valve 5, a first valve 6, a temperature transmitter 7, a volume pipe 8, a pressure transmitter 9, a second valve 10, an orifice plate 11, a displacement sensor 12, a measurement and control integrated device 13 and an upper computer 14.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
As shown in fig. 1, the single pulse flow measuring device based on the volume tube and the displacement sensor of the present invention mainly includes a gas cylinder 1, a pressure reducing valve 2, a storage tank 3, a solenoid valve 4, a fast response solenoid valve 5, a first valve 6, a second valve 10, a pressure transmitter 9, a temperature transmitter 7, a displacement sensor 12, a volume tube 8, an orifice plate 11, a measurement and control integrated device 13, an upper computer 14, and the like.
Wherein the gas cylinder 1, the pressure reducing valve 2, the storage tank 3, the electromagnetic valve 4 and the quick response electromagnetic valve 5 are sequentially connected through a pipeline to form a single pulse control unit; the gas cylinder 1 is a nitrogen gas cylinder 1, and a medium to be detected, which is a propellant here, is stored in the storage tank 3.
Wherein volume pipe 8 is through precision finishing's volume pipe 8, ensures volume pipe 8 internal diameter upper and lower unanimity as far as possible, selects the stainless steel pipe that the internal diameter height is even as volume pipe 8 in this embodiment. The first valve 6 may be a pneumatic ball valve or a manual ball valve. The pressure transmitter 9 and the temperature transmitter 7 are used for acquiring the pressure and the temperature in the volume pipe 8 respectively. The displacement sensor 12 is the core of a single-pulse flow measuring standard device for accurately measuring the height change of the medium in the volume tube 8. The present embodiment selects the micro-pulse displacement sensor 12 or the laser displacement sensor 12 that meets the time response measurement requirements of single-pulse flow and transient flow.
The second valve 10 and the orifice plate 11 form a liquid path when the liquid does not flow through the volume pipe 8, the inlet end of the second valve 10 is connected with the outlet end of the quick response solenoid valve 5, and the outlet end of the second valve 10 is connected with the orifice plate 11. Wherein the second valve 10 can be a pneumatic ball valve or a manual ball valve.
As shown in fig. 2, the measurement and control integrated device is used for controlling the opening and closing of the electromagnetic valve 4, the quick response electromagnetic valve 5, the first valve 6 and the second valve 10, collecting data of the displacement sensor, and sending the data to an upper computer.
The upper computer comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the received data is processed to obtain the monopulse mass flow qM：
Wherein S is the sectional area of the volume tube; Δ L is the liquid level height change; t is time; and rho is the density of the medium in the volume tube.
The specific measurement is realized by the following processes: after the pressure of the nitrogen in the gas cylinder 1 is reduced by the pressure reducing valve 2, the nitrogen enters the storage tank 3 to extrude the propellant in the storage tank 3; the measurement and control integrated device controls the opening and closing of the electromagnetic valve 4 and the quick response electromagnetic valve 5, the electromagnetic valve 4 controls the opening and closing of the propellant flowing out of the storage tank 3, the propellant flows out in a waveform formed by the starting and closing of the quick response electromagnetic valve 5 through the quick opening and closing of the quick response electromagnetic valve 5 and enters the next link; i.e. when the single pulse flow of the propellant does not need to be measured, the first valve 6 is closed and the second valve 10 is opened; when single pulse measurement is carried out, the measurement and control integrated device opens the first valve 6, the propellant flows out according to the waveform formed by starting and closing the quick response electromagnetic valve 5, enters the volume pipe 8, the displacement sensor 12 measures the liquid level change in the volume pipe 8, and the temperature transmitter 7 and the pressure transmitter 9 measure the temperature and the pressure in the volume pipe 8. The measurement and control integrated device collects liquid level change, temperature and pressure data measured by the displacement sensor 12, the temperature transmitter 7 and the pressure transmitter 9, and calculates and processes the cross section area obtained by combining the calibration of the volume pipe 8 and the density obtained by measurement of an equal-grade standard densimeter to obtain the single-pulse flow.
The displacement sensor 12 is used for measuring the real-time change of the displacement, the product of the real-time change of the displacement and the sectional area of the volume tube 8 is the changed volume, and the instantaneous flow change process can be obtained by dividing the changed volume by the time.
The calculation formula of the monopulse flow measurement is as follows:
in the formula, qMSingle pulse flow (mass flow); s is the sectional area of the volume tube 8; Δ L is the liquid level height change; t is time; ρ is the density of the propellant in the volume tube 8.
The sectional area of the volume tube 8 is calibrated before installation, and is a fixed value in a single-pulse flow measurement calculation formula; the liquid level height variation is measured by the displacement sensor 12, and the medium density is measured by an equal-grade standard densimeter and corrected by temperature and pressure.
At the same density, the mass flow is proportional to the volume, and the volume tube 8 is made of a stainless steel tube with uniform inner diameter and height, so that the flow measurement is finally converted into the measurement of the liquid level height. The single pulse flow can be measured quickly.
The present invention is not limited to the above best mode, and any variations within the teachings of the present invention, whether identical or similar, are within the scope of the present invention.
Claims (10)
1. A monopulse flow measuring device based on a volume tube and a displacement sensor is characterized in that: the device comprises a single-pulse control unit, a single-pulse measuring unit, a conventional liquid path, a measurement and control integrated device and an upper computer;
the single-pulse control unit comprises a gas cylinder (1), a pressure reducing valve (2), a storage box (3), an electromagnetic valve (4) and a quick response electromagnetic valve (5) which are sequentially arranged along a pipeline; inert gas is filled in the gas bottle (1); a medium to be detected is arranged in the storage box (3);
the single-pulse measuring unit comprises a first valve (6), a volume pipe (8) and a displacement sensor (12) arranged in the volume pipe (8), and the displacement sensor (12) is used for acquiring the height change of the liquid level of a medium in the volume pipe; the inlet end of the first valve (6) is connected with the outlet end of the quick response electromagnetic valve (5), and the outlet end of the first valve (6) is connected with the liquid inlet of the volume pipe (8);
the conventional liquid path comprises a second valve (10) and an orifice plate (11), the inlet end of the second valve (10) is connected with the outlet end of the quick response electromagnetic valve (5), and the outlet end of the second valve (10) is connected with the orifice plate (11);
the measurement and control integrated device is used for controlling the on-off of the electromagnetic valve (4), the quick response electromagnetic valve (5), the first valve (6) and the second valve (10), collecting data of the displacement sensor and sending the data to an upper computer;
the upper computer comprises a memory and a processor, a computer program is stored in the memory, and when the computer program is executed by the processor, the received data is processed as follows to obtain the monopulse mass flow qM：
Wherein S is the sectional area of the volume tube; Δ L is the liquid level height change; t is time; and rho is the density of the medium in the volume tube.
2. The single pulse flow measurement device based on a volumetric tube and a displacement sensor according to claim 1, characterized in that: the single-pulse measuring unit also comprises a pressure transmitter (9) and a temperature transmitter (7) which are arranged in the volume pipe (8).
3. The single pulse flow measurement device based on a volumetric tube and a displacement sensor according to claim 2, characterized in that: and the displacement sensor (12), the pressure transmitter (9) and the temperature transmitter (7) are all arranged at the top end in the volume pipe (8).
4. The single pulse flow measurement device based on a volumetric tube and a displacement sensor according to claim 2, characterized in that: the cross-sectional area of the volume tube (8) is equal everywhere.
5. The single pulse flow measurement device based on a volumetric tube and a displacement sensor according to claim 4, characterized in that: the volume pipe (8) is a stainless steel pipe.
6. The single pulse flow measurement device based on a volumetric tube and a displacement sensor according to claim 4, characterized in that: the displacement sensor (12) is a micro-pulse displacement sensor or a laser displacement sensor.
7. The single pulse flow measurement device based on a volumetric tube and a displacement sensor according to claim 6, characterized in that: the first valve (6) and the second valve (10) are pneumatic ball valves or manual ball valves.
8. The single pulse flow measurement device based on a volumetric tube and a displacement sensor according to claim 7, characterized in that: the inert gas is nitrogen.
9. A method of performing monopulse flow measurement using the apparatus of any one of claims 1-8, comprising the steps of:
the method comprises the following steps that firstly, a measurement and control integrated device controls the on-off of an electromagnetic valve and a quick response electromagnetic valve, so that a medium in a storage tank flows out in a waveform formed by starting and closing the quick response electromagnetic valve after the medium is extruded by inert gas in a gas cylinder;
step two, when single pulse measurement is carried out, the measurement and control integrated device controls the first valve to be opened, so that the medium in the storage tank enters the volume pipe;
thirdly, measuring the change of the liquid level height in the volume tube by using a displacement sensor;
fourthly, the measurement and control integrated device collects data measured by the displacement sensor and sends the data to an upper computer;
step five, the upper computer performs the following processing on the received data to obtain the monopulse mass flow qM：
Wherein S is the sectional area of the volume tube; Δ L is the liquid level height change; t is time; and rho is the density of the medium in the volume tube.
10. The method of effecting single pulse flow measurement of claim 9, wherein:
the third step also includes the process of measuring the temperature and pressure in the volume tube by using a temperature transmitter and a pressure transmitter;
the fourth step also comprises a process that the measurement and control integrated device collects temperature and pressure data measured by the temperature transmitter and the pressure transmitter;
and step five, a process of correcting the density of the medium in the volume pipe by using the temperature and pressure data is also included.
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| CN201911155499.2A CN110864752A (en) | 2019-11-22 | 2019-11-22 | Single-pulse flow measuring device and method based on volume tube and displacement sensor |
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| CN201911155499.2A CN110864752A (en) | 2019-11-22 | 2019-11-22 | Single-pulse flow measuring device and method based on volume tube and displacement sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112890703A (en) * | 2021-01-14 | 2021-06-04 | 深圳拓邦股份有限公司 | Water quantity control method and device for floor washing machine, floor washing machine and readable storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102483344A (en) * | 2009-07-24 | 2012-05-30 | Mks仪器公司 | Upstream Volume Mass Flow Verification Systems And Methods |
| CN109307598A (en) * | 2018-11-11 | 2019-02-05 | 上海空间推进研究所 | Fault identification pulse operation engine propellant flow rate bimodulus measurement method and device |
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- 2019-11-22 CN CN201911155499.2A patent/CN110864752A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102483344A (en) * | 2009-07-24 | 2012-05-30 | Mks仪器公司 | Upstream Volume Mass Flow Verification Systems And Methods |
| CN109307598A (en) * | 2018-11-11 | 2019-02-05 | 上海空间推进研究所 | Fault identification pulse operation engine propellant flow rate bimodulus measurement method and device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112890703A (en) * | 2021-01-14 | 2021-06-04 | 深圳拓邦股份有限公司 | Water quantity control method and device for floor washing machine, floor washing machine and readable storage medium |
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Application publication date: 20200306 |