CN110967076A - Miniature intrinsically safe oil gas recovery ultrasonic gas flow measuring instrument - Google Patents

Miniature intrinsically safe oil gas recovery ultrasonic gas flow measuring instrument Download PDF

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Publication number
CN110967076A
CN110967076A CN201811153791.6A CN201811153791A CN110967076A CN 110967076 A CN110967076 A CN 110967076A CN 201811153791 A CN201811153791 A CN 201811153791A CN 110967076 A CN110967076 A CN 110967076A
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CN
China
Prior art keywords
circuit
ultrasonic sensor
ultrasonic
gas
communicating pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811153791.6A
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Chinese (zh)
Inventor
韩小虎
扶立红
龚文杰
吴桓
孙建章
邓浩
黎敏
唐浩倬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Youjiete Environmental Protection Technology Co ltd
Chengdu Anderson Measurement Co ltd
Original Assignee
Youjiete Environmental Protection Technology Co ltd
Chengdu Anderson Measurement Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Youjiete Environmental Protection Technology Co ltd, Chengdu Anderson Measurement Co ltd filed Critical Youjiete Environmental Protection Technology Co ltd
Priority to CN201811153791.6A priority Critical patent/CN110967076A/en
Publication of CN110967076A publication Critical patent/CN110967076A/en
Pending legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/66Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/667Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters

Abstract

The invention discloses a miniature intrinsic safety ultrasonic gas flow measuring instrument for recovering oil and gas, which comprises a communicating pipe, wherein a shell is connected to the communicating pipe, and a first ultrasonic sensor and a second ultrasonic sensor are arranged on different cross sections in the communicating pipe; a transmitter circuit board is arranged in the outer shell of the communicating pipe, and the first ultrasonic sensor and the second ultrasonic sensor are respectively and electrically connected with the transmitter circuit board through cables; a flow contracting platform is arranged in the communicating pipe. The accuracy of low-speed or high-speed detection of the gas is improved, and the safety of combustible gas detection is improved; the time measurement is more accurate through the accurate time difference measurement, so that higher measurement accuracy is obtained.

Description

Miniature intrinsically safe oil gas recovery ultrasonic gas flow measuring instrument
Technical Field
The invention relates to a gas flow measuring instrument, in particular to a micro intrinsic safety ultrasonic gas flow measuring instrument for recovering oil and gas.
Background
With the development of cities and industries, the demands of people on gas, natural gas, industrial gas and the like are increasing day by day, and the measurement technology of gas flow measurement is more and more emphasized by people. The flow measuring instrument capable of measuring various gases more accurately, conveniently and stably is very important.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the micro intrinsic safety ultrasonic gas flow measuring instrument for recovering oil gas is provided, so that the problem of gas metering recovery during volatile oil gas recovery and the problem of safety during combustible gas recovery are solved.
The technical scheme adopted by the invention is as follows:
a micro intrinsic safety ultrasonic gas flow measuring instrument for recovering oil and gas comprises a communicating pipe, wherein a shell is connected to the communicating pipe, and a first ultrasonic sensor and a second ultrasonic sensor are arranged on different cross sections in the communicating pipe; a transmitter circuit board is arranged in the outer shell of the communicating pipe, and the first ultrasonic sensor and the second ultrasonic sensor are respectively and electrically connected with the transmitter circuit board through cables; a flow contracting platform is arranged in the communicating pipe.
Further, the invention discloses a preferable structure of the micro intrinsic safety ultrasonic gas recovery flow measuring instrument, wherein the inner diameter of the position where the first ultrasonic sensor and the second ultrasonic sensor are arranged in the communicating pipe is larger than the diameter of the first ultrasonic sensor and the diameter of the second ultrasonic sensor; the flow contracting table comprises a front flow guiding curve and a rear flow guiding curve, the front flow guiding curve forms a flow guiding passage from the first ultrasonic sensor to the flow contracting table, and the rear flow guiding curve forms a flow guiding passage from the flow contracting table to the second ultrasonic sensor.
Furthermore, the front diversion curve and the rear diversion curve comprise inclined planes connected with two different pipe diameters, the inclination angle of each inclined plane is 43-48 degrees, the connection part of each inclined plane and each pipe diameter is an arc curve, and the radius of each arc curve is 2.5-3.5 mm.
Furthermore, the transmitter circuit board comprises a processor, a time-to-digital converter, a signal detection switching circuit, a sensor transceiving control circuit, a communication circuit and a power supply circuit, wherein the processor is connected with the communication circuit, the power supply circuit, the driving circuit, the time-to-digital converter, the signal detection switching circuit and the sensor transceiving control circuit in a signal mode.
Furthermore, the transmitter circuit board comprises a secondary signal conditioning circuit, the processor is in signal connection with the time-to-digital converter, the time-to-digital converter is in signal connection with the input end of the secondary signal conditioning circuit, the input end of the secondary signal conditioning circuit is connected with the signal output end of the signal detection switching circuit, and the control input end of the signal detection switching circuit is in signal connection with the processor.
Furthermore, the transmitter circuit board comprises a first primary signal conditioning circuit and a second primary signal conditioning circuit, and the first primary signal conditioning circuit and the second primary signal conditioning circuit are respectively connected with the first ultrasonic sensor and the second ultrasonic sensor in a one-to-one correspondence manner; the sensor transceiving control circuit is connected with the first ultrasonic sensor and the second ultrasonic sensor through cables in a signal mode, and the control input end of the sensor transceiving control circuit is connected with the processor in a signal mode.
Further, the communication circuit comprises a pulse communication interface circuit and an RS485 communication interface circuit; the power supply circuit comprises a power supply interface and an intrinsic safety processing circuit, and the power supply interface is electrically connected with a load of the transmitter circuit board through the intrinsic safety processing circuit.
Further, the transmitter circuit board comprises a temperature detection circuit, a temperature sensor is arranged on the inner wall of the communicating pipe and is connected with the temperature detection circuit through a lead in a signal mode, and the temperature detection circuit is connected with the processor in a signal mode.
Furthermore, the shell is connected with a cable tube, and the transmitter circuit board is communicated with the outside through a cable; the communicating pipe comprises a gas outlet and a gas inlet, and the calibers of the gas outlet and the gas inlet are 008-.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. by the aid of the gas detector, low-speed or high-speed detection precision of gas is improved, and safety of combustible gas detection is improved; and no mechanical vibration exists, and the system is safe and reliable.
2. The time measurement is more accurate through the accurate time difference measurement, so that higher measurement accuracy is obtained.
3. By adopting the intrinsic safety type design, an explosion-proof hose is not needed, the wiring is simple, and the installation and maintenance cost is low.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a block diagram of the circuit configuration of the present invention;
FIG. 3 is a schematic view of a measurement flow path structure;
the labels in the figure are: the ultrasonic flow meter comprises a shell 1, a transmitter circuit board 2, a communicating pipe 3, a gas outlet 4, a second ultrasonic sensor 5, a first ultrasonic sensor 6, a gas inlet 7, a cable pipe 8, a flow measurement device 9, a flow reduction table 10, a front flow guide curve 11 and a rear flow guide curve 12.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1-3, the ultrasonic sensor comprises a communication pipe 3, a housing 1 is arranged outside the communication pipe 3, a transmitter circuit board 2 is arranged inside the housing 1 outside the communication pipe 3, a second ultrasonic sensor 5 and a first ultrasonic sensor 6 are arranged at different cross sections in the communication pipe 3, and the second ultrasonic sensor 5 and the first ultrasonic sensor 6 are in signal connection with the transmitter circuit board 2 through lead wires. The communicating pipe 3 is made of aluminum alloy or stainless steel, and the shell 1 is made of flame-retardant plastic or metal and used for improving the explosion-proof performance of the communicating pipe. The second ultrasonic sensor 5 and the first ultrasonic sensor 6 can receive or transmit ultrasonic waves, convert the received ultrasonic waves into electric signals and transmit the electric signals, or transmit corresponding ultrasonic waves according to received telecommunication signals.
A flow contracting table 10 is arranged in the communicating pipe 3, and the inner diameters of the positions where the first ultrasonic sensor 6 and the second ultrasonic sensor 5 are arranged in the communicating pipe 3 are larger than the diameters of the first ultrasonic sensor 6 and the second ultrasonic sensor 5; the flow contracting platform 10 comprises a front flow guiding curve 11 and a rear flow guiding curve 12, wherein the front flow guiding curve 11 forms a flow guiding passage from the first ultrasonic sensor 6 to the flow contracting platform 10, and the rear flow guiding curve 12 forms a flow guiding passage from the flow contracting platform 10 to the second ultrasonic sensor 5. The front diversion curve 11 and the rear diversion curve 12 comprise inclined planes connected with two different pipe diameters, the inclination angle of each inclined plane is 45 degrees, the connection part of each inclined plane and each pipe diameter is an arc curve, and the radius of each arc curve is 3 mm. Therefore, the flow velocity of the measuring channel formed in the flow contracting table 10 is uniform, the flow velocity difference between the inner wall and the center is reduced, the measuring precision is improved, and the measuring error is reduced.
The transmitter circuit board 2 comprises a processor, a time-to-digital converter, a signal detection switching circuit, a sensor transceiving control circuit, a communication circuit and a power supply circuit, wherein the processor is connected with the communication circuit, the power supply circuit, a driving circuit, the time-to-digital converter, the signal detection switching circuit and the sensor transceiving control circuit in a signal mode. The transmitter circuit board 2 comprises a secondary signal conditioning circuit, the processor is in signal connection with the time-to-digital converter, the time-to-digital converter is in signal connection with the input end of the secondary signal conditioning circuit, the input end of the secondary signal conditioning circuit is connected with the signal output end of the signal detection switching circuit, and the control input end of the signal detection switching circuit is in signal connection with the processor. The transmitter circuit board 2 comprises a first primary signal conditioning circuit and a second primary signal conditioning circuit, and the first primary signal conditioning circuit and the second primary signal conditioning circuit are respectively connected with the first ultrasonic sensor 6 and the second ultrasonic sensor 5 in a one-to-one correspondence manner; the sensor transceiving control circuit is connected with the first ultrasonic sensor 6 and the second ultrasonic sensor 5 through leads in a signal mode, and the control input end of the sensor transceiving control circuit is connected with the processor in a signal mode.
When the gas distribution device is used specifically, the device is arranged on a gas circulation pipeline, and the device is connected with a power supply and a receiver.
In the specific operation process, the processor controls the sensor transceiving control circuit, and the sensor transceiving control circuit controls the first ultrasonic sensor 6 and the second ultrasonic sensor 5 to alternately send and receive ultrasonic signals; the first ultrasonic sensor 6 and the second ultrasonic sensor 5 process the received signals through the first primary signal conditioning circuit and the second primary signal conditioning circuit and then send the processed signals to the secondary signal conditioning circuit, and the secondary signal conditioning circuit processes the processed signals and then sends the processed signals to the time-to-digital converter. The time-to-digital converter automatically transmits the time value detected this time to the processor when the first ultrasonic sensor 6 transmits the signal received by the second ultrasonic sensor 5, and automatically transmits the time value detected this time to the processor when the first ultrasonic sensor 6 receives the signal transmitted by the second ultrasonic sensor 5. The processor calculates the forward flow propagation time Ts and the backward flow propagation time Tn of the sound wave in the medium.
The following two states are available during operation:
1. the first ultrasonic sensor 6 is in a transmitting state and the second ultrasonic sensor 5 is in a receiving state, and then the propagation time Ts of the pulse downstream in the measured medium is measured.
2. The second ultrasonic sensor 5 is in a transmitting state and the first ultrasonic sensor 6 is in a receiving state, and then the propagation time Tn of the pulse flowing backward in the measured medium is measured.
The flow rate can be calculated by the following method:
Ts = L/(ν0 + ν*cosθ);
Tn = L/(ν0 - ν*cosθ);
ΔT=(Tn-Ts);
ΔT = Tn-Ts = L/(ν0 - ν*cosθ) - L/(ν0 + ν*cosθ)
= 2*L*ν*cosθ / (ν0² - ν²*cosθ²);
ν≈ ΔT*ν0² / 2*L*cosθ;
calculating the flow rate Q from the inner diameter D of the measuring tube:
Q =K* (πD² / 4) * ν;
ts- - -ultrasonic downstream transit time in seconds(s);
tn- - -ultrasonic countercurrent propagation time in seconds(s);
Δ T- - -the difference between the upstream time Ts and the downstream time Tn: Tn-Ts in seconds(s);
l- -ultrasonic transmission distance in meters (m);
v 0- -the propagation velocity of the ultrasonic waves in the fluid, in meters per second (m/s);
v- - -the flow velocity of the measured medium, in meters per second (m/s);
theta < - > -the included angle between the flowing direction of the measured medium and the propagation direction of the ultrasonic waves, and the unit is Degree (DEG);
k, correcting the error of the pipeline flow correction coefficient;
q- - -pipe flow in cubic meters per second (m/s);
d- -the inside diameter of the pipe in meters (m);
to this end, the flow Q through the pipe is calculated.
Example 1:
in addition to the above embodiments, a preferred embodiment of a micro intrinsically safe ultrasonic gas flow meter for oil and gas recovery is disclosed.
The communication circuit comprises a pulse communication interface circuit and an RS485 communication interface circuit; the power supply circuit comprises a power supply interface and an intrinsic safety processing circuit, and the power supply interface is electrically connected with a load of the transmitter circuit board 2 through the intrinsic safety processing circuit. By adopting the pulse communication interface circuit, the communication broadband and the communication efficiency can be improved, the sampling rate is further improved, and the measurement precision is improved.
The transmitter circuit board 2 comprises a temperature detection circuit, and the temperature detection circuit is connected with the processor through signals. The inner wall of the communicating pipe 3 is provided with a temperature sensor which is connected with a temperature detection circuit signal through a lead. By setting the temperature detection electric energy, the working temperature of the second ultrasonic sensor 5 and the first ultrasonic sensor 6 can be detected, so that the output characteristics of the second ultrasonic sensor 5 and the first ultrasonic sensor 6 can be known, the characteristics of the transmitted sound of the detected gas can be determined, the result can be corrected, and the measurement precision can be improved. The temperature detection electric energy comprises a temperature detection sensor 4, and the temperature detection sensor 4 realizes temperature acquisition and provides the temperature acquisition for the processor for temperature correction.
Example 2:
based on embodiment 1, a preferred embodiment of a micro intrinsically safe ultrasonic gas flow meter for oil and gas recovery is disclosed.
The shell 1 is connected with a cable tube 8, and the transmitter circuit board 2 is communicated with the outside through a cable; the communicating pipe 3 comprises a gas outlet 4 and a gas inlet 7, wherein the apertures of the gas outlet 4 and the gas inlet 7 are both 008-025 aluminum alloy joints. This embodiment uses a 008-gauge joint. The gas outlet 4 and the gas inlet 7 are connected with a pipeline by adopting threaded joints.
The transmitter mainboard satisfies the explosion-proof design requirement of GB 3836. The protection rating of the enclosure 1 reaches the IP65 rating.
Example 3:
as shown in fig. 3, the angle θ between the front diversion curve 11 and the rear diversion curve 12 of the flow contracting platform 10 and the communicating pipe 3 is 45 °, and the arc radius at the transition connection is 3 mm. Under the action of fluid mechanics, the gas flow flowing through the flow reduction table 10 does not generate flow speed difference and turbulent flow due to the viscosity of the pipe wall, and the gas flow speed of the whole cross section is uniform. Therefore, the uniformity of the airflow of the measuring channel can be guaranteed to the maximum extent, and the measuring accuracy is guaranteed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (9)

1. The utility model provides a miniature this ampere of ultrasonic wave gas flow measurement appearance of retrieving of oil gas which characterized in that: the ultrasonic sensor comprises a communicating pipe (3), wherein a shell (1) is connected to the communicating pipe (3), and a first ultrasonic sensor (6) and a second ultrasonic sensor (5) are arranged on different cross sections in the communicating pipe (3); a transmitter circuit board (2) is arranged in an outer shell (1) of the communicating pipe (3), and the first ultrasonic sensor (6) and the second ultrasonic sensor (5) are respectively and electrically connected with the transmitter circuit board (2) through leads; a flow contracting platform (10) is arranged in the communicating pipe (3).
2. The micro intrinsically safe ultrasonic gas flow meter for oil and gas recovery of claim 1, wherein: the inner diameter of the position, in which the first ultrasonic sensor (6) and the second ultrasonic sensor (5) are arranged, of the communicating pipe (3) is larger than the diameter of the first ultrasonic sensor (6) and the diameter of the second ultrasonic sensor (5); the flow reduction table (10) comprises a front flow guide curve (11) and a rear flow guide curve (12), the front flow guide curve (11) forms a flow guide passage from the first ultrasonic sensor (6) to the flow reduction table (10), and the rear flow guide curve (12) forms a flow guide passage from the flow reduction table (10) to the second ultrasonic sensor (5).
3. The micro intrinsically safe ultrasonic gas flow meter for oil and gas recovery of claim 2, wherein: the front diversion curve (11) and the rear diversion curve (12) comprise inclined planes connected with two different pipe diameters, the inclination angle of each inclined plane is 43-48 degrees, the joint of each inclined plane and each pipe diameter is an arc curve, and the radius of each arc curve is 2.5-3.5 mm.
4. The micro intrinsically safe ultrasonic gas flow meter for oil and gas recovery of claim 1, wherein: the transmitter circuit board (2) comprises a processor, a time-to-digital converter, a signal detection switching circuit, a sensor transceiving control circuit, a communication circuit and a power circuit.
5. The micro intrinsically safe ultrasonic gas flow meter of claim 4, wherein: the transmitter circuit board (2) comprises a secondary signal conditioning circuit, the time-to-digital converter is connected with an input end signal of the secondary signal conditioning circuit, a signal output end of the signal detection switching circuit is connected with an input end of the secondary signal conditioning circuit, and a control input end of the signal detection switching circuit is connected with a processor signal.
6. The micro intrinsically safe ultrasonic gas flow meter of claim 5, wherein: the transmitter circuit board (2) comprises a first primary signal conditioning circuit and a second primary signal conditioning circuit, and the first primary signal conditioning circuit and the second primary signal conditioning circuit are respectively connected with the first ultrasonic sensor (6) and the second ultrasonic sensor (5) in a one-to-one correspondence manner; the sensor transceiving control circuit is in signal connection with the first ultrasonic sensor (6) and the second ultrasonic sensor (5) through cables, and the control input end of the sensor transceiving control circuit is in signal connection with the processor.
7. The micro intrinsically safe ultrasonic gas flow meter of claim 4, wherein: the communication circuit comprises a pulse communication interface circuit and an RS485 communication interface circuit; the power supply circuit comprises a power supply interface and an intrinsic safety processing circuit, and the power supply interface is electrically connected with a load of the transmitter circuit board (2) through the intrinsic safety processing circuit.
8. The micro intrinsically safe ultrasonic gas flow meter of claim 4, wherein: the transmitter circuit board (2) comprises a temperature detection circuit, a temperature sensor is arranged on the inner wall of the communicating pipe (3), the temperature sensor is connected with the temperature detection circuit through a lead in signal, and the temperature detection circuit is connected with the processor signal.
9. The micro intrinsically safe ultrasonic gas flow meter for oil and gas recovery of claim 1, wherein: the shell (1) is connected with a cable pipe (8), and the transmitter circuit board (2) is communicated with the outside through a cable; the communicating pipe (3) comprises a gas outlet (4) and a gas inlet (7), and the calibers of the gas outlet (4) and the gas inlet (7) are both 008-.
CN201811153791.6A 2018-09-30 2018-09-30 Miniature intrinsically safe oil gas recovery ultrasonic gas flow measuring instrument Pending CN110967076A (en)

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Application Number Priority Date Filing Date Title
CN201811153791.6A CN110967076A (en) 2018-09-30 2018-09-30 Miniature intrinsically safe oil gas recovery ultrasonic gas flow measuring instrument

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CN110967076A true CN110967076A (en) 2020-04-07

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204177429U (en) * 2014-09-25 2015-02-25 上海玮轩电子科技有限公司 Fluid flow rate measurement apparatus
CN106092229A (en) * 2016-06-16 2016-11-09 浙江大学 Useful signal Blind extracting method and apparatus for ultrasonic gas flowmeter
JP2017181174A (en) * 2016-03-29 2017-10-05 大阪瓦斯株式会社 Ultrasonic meter, and control method therefor
CN207366030U (en) * 2017-10-19 2018-05-15 西安安森智能仪器股份有限公司 A kind of ultrasonic gas flowmeter
CN108534855A (en) * 2018-05-11 2018-09-14 大连理工大学 A kind of new type ultrasonic gas flowmeter and its measurement method
CN108613708A (en) * 2018-07-11 2018-10-02 成都安迪生测量有限公司 A kind of miniature intrinsic safety ultrasonic gas flowmeter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204177429U (en) * 2014-09-25 2015-02-25 上海玮轩电子科技有限公司 Fluid flow rate measurement apparatus
JP2017181174A (en) * 2016-03-29 2017-10-05 大阪瓦斯株式会社 Ultrasonic meter, and control method therefor
CN106092229A (en) * 2016-06-16 2016-11-09 浙江大学 Useful signal Blind extracting method and apparatus for ultrasonic gas flowmeter
CN207366030U (en) * 2017-10-19 2018-05-15 西安安森智能仪器股份有限公司 A kind of ultrasonic gas flowmeter
CN108534855A (en) * 2018-05-11 2018-09-14 大连理工大学 A kind of new type ultrasonic gas flowmeter and its measurement method
CN108613708A (en) * 2018-07-11 2018-10-02 成都安迪生测量有限公司 A kind of miniature intrinsic safety ultrasonic gas flowmeter

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Application publication date: 20200407