CN116840506A - Pipeline gas flow velocity measurement method and ultrasonic probe device - Google Patents
Pipeline gas flow velocity measurement method and ultrasonic probe device Download PDFInfo
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- CN116840506A CN116840506A CN202310798086.6A CN202310798086A CN116840506A CN 116840506 A CN116840506 A CN 116840506A CN 202310798086 A CN202310798086 A CN 202310798086A CN 116840506 A CN116840506 A CN 116840506A
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- 239000000523 sample Substances 0.000 title claims abstract description 141
- 238000000691 measurement method Methods 0.000 title claims abstract description 7
- 238000005259 measurement Methods 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 16
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 33
- 229910052697 platinum Inorganic materials 0.000 claims description 15
- 230000003014 reinforcing effect Effects 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 12
- 238000009530 blood pressure measurement Methods 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 8
- 238000009529 body temperature measurement Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000012937 correction Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
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- 239000003990 capacitor Substances 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/24—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave
- G01P5/245—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave by measuring transit time of acoustical waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
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Abstract
The invention belongs to the technical field of mine gas drainage detection. The utility model relates to a pipeline gas flow velocity measuring method and an ultrasonic probe device, which comprises a probe main body, an installation sleeve and a flat flange, wherein the flat flange is fixedly arranged at one end of the installation sleeve and is used for being connected with a sensor end; the probe main body is arranged at the other end of the mounting sleeve and extends into the gas pipeline; the probe main body comprises a probe mounting cylinder, two ultrasonic transducers and a temperature probe; the probe device adopts the plug-in probe rod structure, has compact structural layout, is small and light, can be simply installed by only opening one hole, and overcomes the defect of the installation of the pipe section type ultrasonic gas flowmeter. The invention optimizes the flow velocity measurement method, realizes the simultaneous measurement of temperature, pressure and flow velocity, uses temperature and pressure signals for flow velocity measurement compensation, improves the measurement precision and consistency of products, and provides scientific basis and guarantee for accurate measurement of the flow velocity of the pipeline gas.
Description
Technical Field
The invention belongs to the technical field of mine gas drainage detection, and relates to a pipeline gas flow rate measurement method and an ultrasonic probe device.
Background
The coal mine gas extraction is one of the effective means of gas control, and is a fundamental measure for guaranteeing the coal mine safety exploitation; a large amount of gas exists in the mine, and if the gas is not timely pumped out, the gas can cause serious threat to the lives of workers; meanwhile, the gas is inflammable and explosive gas, and once the gas is accumulated to a certain concentration, the risks of fire and explosion are greatly increased. Therefore, mine gas drainage and the importance thereof are realized, and accurate measurement of mine gas drainage becomes one of the necessary guarantees of coal mine safety production.
The lower limit of gas flow velocity measurement based on the ultrasonic principle is low, and the method is widely applied to gas drainage detection of mine pipelines. At present, a pipe section type ultrasonic gas flowmeter is generally adopted for detection, but the pipe section is heavy and the installation process is complex; there are also plug-in ultrasonic gas flow meters, which are often of relatively large diameter, require relatively large openings in the pipe, and have limited measurement accuracy due to flow field interference.
Disclosure of Invention
In view of the above, the invention provides a method for measuring the flow rate of gas in a pipeline and an ultrasonic probe device to achieve the purpose of accuracy and scientificity in gas drainage detection of a pipeline type ultrasonic gas flowmeter and a mine pipeline.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the ultrasonic probe device comprises a probe main body, a mounting sleeve and a flat flange, wherein the flat flange is fixedly arranged at one end of the mounting sleeve and is used for being connected with a sensor end; the probe main body is arranged at the other end of the mounting sleeve and extends into the gas pipeline;
the probe main body comprises a probe mounting cylinder, two ultrasonic transducers and a temperature probe; the probe mounting cylinder is cylindrical, and ultrasonic mounting holes are respectively formed in two ends of the probe mounting cylinder and are used for mounting ultrasonic transducers;
the middle of the probe mounting cylinder is provided with an air flow channel, two sides of the air flow channel are provided with reinforcing ribs, and two ends of the probe mounting cylinder are fixedly connected through the reinforcing ribs; the reinforcing ribs are of hollow structures, the inside of one reinforcing rib is provided with a wiring hole for installing a cable, and the inside of the other reinforcing rib is provided with the temperature probe;
the temperature probe is tightly attached to the side wall of the probe mounting cylinder so as to detect the temperature of the air flow; the two ultrasonic transducers are oppositely arranged at two sides of the airflow channel, one of the ultrasonic transducers is used as an ultrasonic generator, and the other ultrasonic transducer is used as an ultrasonic receiver to detect the airflow velocity.
Further, an inner wire passing cavity and an outer pressure cavity which are not communicated with each other are arranged in the mounting sleeve, and cables of the ultrasonic transducer and the temperature probe pass through the inner wire passing cavity and are connected with external equipment;
the side wall of the mounting sleeve is provided with a pressure taking port which is arranged in the gas pipeline; the pressure measuring device is characterized in that a pressure hole is formed in the flat flange, and the pressure taking port is communicated with the pressure hole through the outer pressure cavity, so that the pressure of the gas pipeline is measured through the pressure hole.
Further, the two ends of the airflow channel are provided with transitional arc surfaces so as to reduce interference to a flow field.
Further, a probe connecting sleeve and a wiring tube body are arranged between the probe main body and the mounting sleeve, one end of the wiring tube body is communicated with the inner wire passing cavity, and the other end of the wiring tube body is connected with the probe main body through the probe connecting sleeve; the cable passes through the probe connecting sleeve and the wiring tube body and then enters the inner wire passing cavity.
Further, the wiring pipe body is in a bent state, and the bending angle is 20-30 degrees.
Further, the panel flange is provided with a wire passing hole communicated with the inner wire passing cavity for leading out the cable; and a drain hole is further formed in the side face of the flat flange, communicated with the outer pressure cavity and used for flushing after the pressure hole is blocked.
Further, one end of the probe mounting cylinder, which is far away from the mounting sleeve, is provided with a sealing cover for sealing the ultrasonic mounting hole by the sealing cover to seal and protect the probe.
Furthermore, two ends of the probe connecting sleeve are provided with rabbets which are respectively connected with the probe main body and the wiring tube body; a conical hole is arranged in the probe connecting sleeve, so that the cable can easily pass through the probe connecting sleeve.
The method for measuring the gas flow rate of the pipeline adopts the ultrasonic probe device and is arranged on the gas pipeline to be measured, and the measuring method comprises the following steps:
step (1), pipeline average flow velocity measurement based on ultrasonic principle:
A. inserting the ultrasonic probe device into a pipeline measurement position, adjusting the direction, enabling pipeline fluid to enter an air flow channel sampling area of the ultrasonic probe device, redefining a uniform boundary area, and forming a stable flow field in the measurement area;
B. two ultrasound wavesThe wave transducers are defined as A1 and A2, the A1 transmits sound wave, the A2 receives sound wave, and the acquisition time t A1 The method comprises the steps of carrying out a first treatment on the surface of the The probe A2 transmits sound wave, A1 receives sound wave, and the acquisition time t A2 ；
C. Calculating the average wind speed corresponding to the probe group:
the measured average wind speed v is calculated according to the ultrasonic time difference method,
wherein θ represents the bending angle of the probe, and L is the ultrasonic wave propagation path;
step (2), collecting a conversion temperature measurement signal:
A. the temperature probe adopts a platinum resistance element, determines the selection of a platinum resistance and a reference resistance, and selects PT1000 and 1000 ohm reference resistances with higher resolution ratio so as to improve the measurement accuracy;
B. triggering the platinum resistor PT1000 and the reference resistor to charge and discharge the same capacitor with temperature stability, and recording the discharge time through the time-to-digital converter, wherein the discharge time is respectively recorded as follows: t (T) PT1000 And T REF ；
C. Determining a resistance measurement value, obtainable by a discharge time ratio calculation:
wherein R is the measured value of Pt1000 resistor, 1000 is the reference resistance value of Pt resistor at 0 ℃, T PT1000 For PT1000 platinum resistance discharge time, T REF The reference resistor discharge time;
D. determining a temperature measurement: calculated by RTD temperature equation:
wherein T is the current measured temperature, R is the resistance value of a platinum resistor PT1000, A,B is a correction coefficient, wherein A takes the value of 3.9083 multiplied by 10 -3 The method comprises the steps of carrying out a first treatment on the surface of the B has a value of-5.775×10 -7 ；
Step (3), collecting and converting pressure measurement signals:
A. determining the type of the pressure element, and selecting a diaphragm type pressure element; the diaphragm type pressure element encapsulates the diffusion silicon pressure sensitive chip into a stainless steel shell, the external pressure is transmitted to the sensitive chip through the stainless steel diaphragm and the internally sealed silicone oil, the sensitive chip is not directly contacted with the measured medium, and an all-solid-state structure for pressure measurement is formed, so that the influence of water vapor, dust and corrosive medium is prevented;
B. the signal amplification and conversion processing, wherein an operational amplifier is used for amplifying the voltage signal of the pressure element to be more than 1V and converting the voltage signal into a digital signal;
C. determining pressure measurement value, acquiring element voltage digital signal, testing, calibrating and correcting, calculating,
P＝K*V
wherein P is pressure, K is correction coefficient, and V is element voltage digital signal;
and (4) outputting temperature and pressure probe signals for flow rate measurement compensation: the probe outputs temperature and pressure signals through the cable for the ultrasonic gas sensor to use.
The invention has the beneficial effects that:
(1) The probe device adopts the plug-in probe rod structure, has compact structural layout, is small and light, can be simply installed by only opening one hole, and overcomes the defect of the installation of the pipe section type ultrasonic gas flowmeter.
(2) The probe device adopts two mutually independent and airtight cavities, thereby not only ensuring the accuracy of pressure measurement, but also protecting the ultrasonic probe and the temperature probe, avoiding the impact damage of impurities flowing at high speed in a pipeline to elements, preventing corrosive gas in the pipeline from entering the inside of the sensor, and improving the reliability of products.
(3) The probe device optimizes the local structure of the probe, so that the transition of the fluid sampling boundary area is smoother, the interference influence on the flow field in the pipeline is reduced as much as possible, and the gas flow measurement stability is improved. The temperature probe is arranged in the closed space, so that the temperature probe can be effectively protected, and meanwhile, the structure is more compact. The probe bending connecting part adopts the diameter reduction technical scheme, the size of the wiring pipe body is smaller than that of the probe body, and the wiring pipe body has stronger trafficability when being inserted into a pipeline, so that the size of the opening of the pipeline is reduced, and the diameter of the opening is only larger than that of the probe.
(4) The invention optimizes the flow velocity measurement method, realizes the simultaneous measurement of temperature, pressure and flow velocity, uses temperature and pressure signals for flow velocity measurement compensation, and improves the measurement precision and consistency of products based on a high-precision discharge time measurement principle.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
fig. 1 is a schematic view of the overall structure of an ultrasonic probe apparatus according to the present invention.
Fig. 2 is a schematic view showing an internal structure of an ultrasonic probe apparatus according to the present invention.
FIG. 3 is a schematic view of the structure of the probe mounting cylinder in the invention.
Fig. 4 is a schematic view of the structure of the sealing cover in the invention.
Fig. 5 is a schematic view of a probe connecting sleeve structure in the invention.
FIG. 6 is a schematic view of a mounting sleeve according to the present invention.
FIG. 7 is a schematic view of a flat flange structure according to the present invention.
FIG. 8 is a flow chart of a measurement method according to the present invention.
Reference numerals: 1-a probe body; 2-a probe connecting sleeve; 3-wiring tube body; 4-mounting a sleeve; 5-a flat flange; 6, sealing the cover; 7-an ultrasonic transducer; 8-a sealing ring; 9-a temperature probe; 10-inner wire passing cavity; 11-an outer pressure chamber; 12-ultrasonic mounting holes; 13-transitional arc surface; 14-air flow channel; 15-reinforcing ribs; 16-wiring holes; 17-connecting threads; 18-sealing the groove; 19-tool holes; 20-spigot; 21-conical holes; 22-a pressure taking port; 23-wire vias; 24-pressure holes; 25-a blow-down hole; 26-mounting holes.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1 to 7, an ultrasonic probe device includes a probe body 1, a mounting sleeve 4, and a plate flange 5, wherein the plate flange 5 is fixedly arranged at one end of the mounting sleeve 4 and is used for connecting with a sensor end; the probe main body 1 is arranged at the other end of the mounting sleeve 4 and extends into the gas pipeline; the probe main body 1 comprises a probe mounting cylinder, two ultrasonic transducers 7 and a temperature probe 9; the probe mounting cylinder is cylindrical, and ultrasonic mounting holes 12 are respectively formed at two ends of the probe mounting cylinder and are used for mounting the ultrasonic transducer 7; the ultrasonic transducer 7 is mounted in the ultrasonic mounting hole 12 by a seal ring 8. The middle of the probe mounting cylinder is provided with an air flow channel 14, the two sides of the air flow channel 14 are provided with reinforcing ribs 15, and the two ends of the probe mounting cylinder are fixedly connected through the reinforcing ribs 15; the reinforcing ribs 15 are hollow structures, and a wiring hole 16 for installing a cable is formed in one of the reinforcing ribs for installing the cable. The temperature probe 9 is arranged in the other reinforcing rib and is clung to the side wall of the probe mounting cylinder. The two ends of the air flow channel 14 are positioned at two sides of the ultrasonic mounting hole 12 and are provided with transition arc surfaces 13 so as to reduce the interference to the flow field.
The ultrasonic generator and the ultrasonic receiver are two ultrasonic transducers 7, one is responsible for generating ultrasonic waves and the other is responsible for receiving ultrasonic waves, and the ultrasonic generator and the ultrasonic receiver are arranged on two sides of the airflow channel 14 in a straight line opposite to each other so as to detect the airflow velocity.
An inner wire passing cavity 10 and an outer pressure cavity 11 which are not communicated with each other are arranged in the mounting sleeve 4, and cables of the ultrasonic receiver, the ultrasonic generator and the temperature probe 9 pass through the inner wire passing cavity 10 to be connected with external equipment; the side wall of the mounting sleeve 4 is provided with a pressure taking port 22, and the pressure taking port 22 is arranged in the gas pipeline; the pressure hole 24 is arranged on the flat flange 5, and the pressure taking port 22 is communicated with the pressure hole 24 through the outer pressure cavity 11, so that the pressure of the gas pipeline is measured through the pressure hole 24.
In this embodiment, a probe connection sleeve 2 and a wiring tube 3 are disposed between a probe body 1 and a mounting sleeve 4, the wiring tube 3 is in a bent state, and the bending angle is 20-30 degrees. The size of the wiring tube body 3 is smaller than that of the probe main body 1, one end of the wiring tube body 3 is communicated with the inner wire passing cavity 10, and the other end of the wiring tube body is connected with the probe main body through the probe connecting sleeve 2; the cable passes through the probe connecting sleeve 2 and the wiring tube body 3 and then enters the inner wire passing cavity 10.
Wherein, the flat flange 5 is provided with a wire through hole 23 communicated with the inner wire through cavity 10 for leading out the cable; the side surface of the plate flange 5 is also provided with a drain hole 25, and the drain hole 25 is communicated with the outer pressure cavity 11 and is used for flushing after the pressure hole 24 is blocked. The flat flange 5 is also provided with a plurality of mounting holes 26 for facilitating the fixed mounting connection.
The one end that the probe installation section of thick bamboo was kept away from installation sleeve 4 is provided with sealed lid 6 for the sealed ultrasonic wave mounting hole 12 of closing cap seals the protection to the probe. The sealing cover 6 is provided with connecting threads 17, a sealing groove 18 and a tool hole 19 on the back surface so as to be convenient for installation.
Two ends of the probe connecting sleeve 2 are provided with rabbets 20 which are respectively connected with the probe main body 1 and the wiring pipe body 3; a conical hole 21 is arranged in the probe connecting sleeve 2, so that the cable can easily pass through the conical hole.
Referring to fig. 8, an ultrasonic probe apparatus in this embodiment is used to install the ultrasonic probe apparatus on a gas pipeline to be measured, and the measuring method includes the following steps:
step (1), pipeline average flow velocity measurement based on ultrasonic principle:
A. inserting the ultrasonic probe device into the pipeline measuring position, adjusting the direction, enabling pipeline fluid to enter the sampling area of the air flow channel 14 of the ultrasonic probe device, redefining a uniform boundary area, and forming a stable flow field in the measuring area;
B. the two ultrasonic transducers are defined as A1 and A2, the A1 transmits sound waves, the A2 receives the sound waves, and the acquisition time t A1 The method comprises the steps of carrying out a first treatment on the surface of the The probe A2 transmits sound wave, A1 receives sound wave, and the acquisition time t A2 ；
C. Calculating the average wind speed corresponding to the probe group:
the measured average wind speed v is calculated according to the ultrasonic time difference method,
wherein θ represents the bending angle of the probe, and L is the ultrasonic wave propagation path;
step (2), collecting a conversion temperature measurement signal:
A. the temperature probe 9 adopts a platinum resistance element to determine the selection type of the platinum resistance and the reference resistance, and selects PT1000 and 1000 ohm reference resistance with higher resolution ratio so as to improve the measurement accuracy;
B. triggering the platinum resistor PT1000 and the reference resistor to charge and discharge the same capacitor with temperature stability, and recording the discharge time through the time-to-digital converter, wherein the discharge time is respectively recorded as follows: t (T) PT1000 And T REF ；
C. Determining a resistance measurement value, obtainable by a discharge time ratio calculation:
wherein R is the measured value of Pt1000 resistor, 1000 is the reference resistance value of Pt resistor at 0 ℃, T PT1000 For PT1000 platinum resistance discharge time, T REF The reference resistor discharge time;
D. determining a temperature measurement: calculated by RTD temperature equation:
wherein T is the current measured temperature, R is the resistance value of the platinum resistor PT1000, A, B is the correction coefficient, and A takes the value of 3.9083 multiplied by 10 -3 The method comprises the steps of carrying out a first treatment on the surface of the B has a value of-5.775×10 -7 ；
Step (3), collecting and converting pressure measurement signals:
A. determining the type of the pressure element, and selecting a diaphragm type pressure element; the diaphragm type pressure element encapsulates the diffusion silicon pressure sensitive chip into a stainless steel shell, the external pressure is transmitted to the sensitive chip through the stainless steel diaphragm and the internally sealed silicone oil, the sensitive chip is not directly contacted with the measured medium, and an all-solid-state structure for pressure measurement is formed, so that the influence of water vapor, dust and corrosive medium is prevented;
B. the signal amplification and conversion processing, wherein an operational amplifier is used for amplifying the voltage signal of the pressure element to be more than 1V and converting the voltage signal into a digital signal;
C. determining pressure measurement value, acquiring element voltage digital signal, testing, calibrating and correcting, calculating,
P＝K*V
wherein P is pressure, K is correction coefficient, and V is element voltage digital signal;
and (4) outputting temperature and pressure probe signals for flow rate measurement compensation: the probe outputs temperature and pressure signals through the cable for the ultrasonic gas sensor to use.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (9)
1. An ultrasonic probe device, characterized in that: the probe comprises a probe body, a mounting sleeve and a flat flange, wherein the flat flange is fixedly arranged at one end of the mounting sleeve and is used for being connected with a sensor end; the probe main body is arranged at the other end of the mounting sleeve and extends into the gas pipeline;
the probe main body comprises a probe mounting cylinder, two ultrasonic transducers and a temperature probe; the probe mounting cylinder is cylindrical, and ultrasonic mounting holes are respectively formed in two ends of the probe mounting cylinder and are used for mounting ultrasonic transducers;
the middle of the probe mounting cylinder is provided with an air flow channel, two sides of the air flow channel are provided with reinforcing ribs, and two ends of the probe mounting cylinder are fixedly connected through the reinforcing ribs; the reinforcing ribs are of hollow structures, the inside of one reinforcing rib is provided with a wiring hole for installing a cable, and the inside of the other reinforcing rib is provided with the temperature probe;
the temperature probe is tightly attached to the side wall of the probe mounting cylinder so as to detect the temperature of the air flow; the two ultrasonic transducers are oppositely arranged at two sides of the airflow channel, one of the ultrasonic transducers is used as an ultrasonic generator, and the other ultrasonic transducer is used as an ultrasonic receiver to detect the airflow velocity.
2. The ultrasonic probe apparatus according to claim 1, wherein: an inner wire passing cavity and an outer pressure cavity which are not communicated with each other are arranged in the mounting sleeve, and cables of the ultrasonic transducer and the temperature probe pass through the inner wire passing cavity and are connected with external equipment;
the side wall of the mounting sleeve is provided with a pressure taking port which is arranged in the gas pipeline; the pressure measuring device is characterized in that a pressure hole is formed in the flat flange, and the pressure taking port is communicated with the pressure hole through the outer pressure cavity, so that the pressure of the gas pipeline is measured through the pressure hole.
3. The ultrasonic probe apparatus according to claim 1, wherein: the two ends of the air flow channel are provided with transitional arc surfaces so as to reduce the interference to the flow field.
4. The ultrasonic probe apparatus according to claim 2, wherein: a probe connecting sleeve and a wiring tube body are arranged between the probe main body and the mounting sleeve, one end of the wiring tube body is communicated with the inner wire passing cavity, and the other end of the wiring tube body is connected with the probe main body through the probe connecting sleeve; the cable passes through the probe connecting sleeve and the wiring tube body and then enters the inner wire passing cavity.
5. The ultrasonic probe apparatus according to claim 4, wherein: the wiring pipe body is in a bending state, and the bending angle is 20-30 degrees.
6. The ultrasonic probe apparatus according to claim 2, wherein: the flat flange is provided with a wire passing hole communicated with the inner wire passing cavity and used for leading out a cable; and a drain hole is further formed in the side face of the flat flange, communicated with the outer pressure cavity and used for flushing after the pressure hole is blocked.
7. The ultrasonic probe apparatus according to claim 1, wherein: and one end of the probe mounting cylinder, which is far away from the mounting sleeve, is provided with a sealing cover for sealing the ultrasonic mounting hole by the sealing cover to seal and protect the probe.
8. The ultrasonic probe apparatus according to claim 4, wherein: two ends of the probe connecting sleeve are provided with rabbets which are respectively connected with the probe main body and the wiring pipe body; a conical hole is arranged in the probe connecting sleeve, so that the cable can easily pass through the probe connecting sleeve.
9. A method for measuring the flow rate of pipeline gas is characterized by comprising the following steps: an ultrasonic probe apparatus according to any one of claims 1 to 8, which is mounted on a gas pipe to be measured, and the measurement method comprises the steps of:
step (1), pipeline average flow velocity measurement based on ultrasonic principle:
A. inserting the ultrasonic probe device into a pipeline measurement position, adjusting the direction, enabling pipeline fluid to enter an air flow channel sampling area of the ultrasonic probe device, redefining a uniform boundary area, and forming a stable flow field in the measurement area;
B. the two ultrasonic transducers are defined as A1 and A2, the A1 transmits sound waves, the A2 receives the sound waves, and the acquisition time t A1 The method comprises the steps of carrying out a first treatment on the surface of the The probe A2 transmits sound wave, A1 receives sound wave, and the acquisition time t A2 ；
C. Calculating the average wind speed corresponding to the probe group:
the measured average wind speed v is calculated according to the ultrasonic time difference method,
wherein θ represents the bending angle of the probe, and L is the ultrasonic wave propagation path;
step (2), collecting a conversion temperature measurement signal:
A. the temperature probe adopts a platinum resistance element, determines the selection of a platinum resistance and a reference resistance, and selects PT1000 and 1000 ohm reference resistances with higher resolution ratio so as to improve the measurement accuracy;
B. triggering the platinum resistor PT1000 and the reference resistor to charge and discharge the same capacitor with temperature stability, and recording the discharge time through the time-to-digital converter, wherein the discharge time is respectively recorded as follows: t (T) PT1000 And T REF ；
C. Determining a resistance measurement value, obtainable by a discharge time ratio calculation:
wherein R is the measured value of Pt1000 resistor, 1000 is the reference resistance value of Pt resistor at 0 ℃, T PT1000 For PT1000 platinum resistance discharge time, T REF The reference resistor discharge time;
D. determining a temperature measurement: calculated by RTD temperature equation:
wherein T is the current measured temperature, R is the resistance value of the platinum resistor PT1000, A, B is the correction coefficient, and A takes the value of 3.9083 multiplied by 10 -3 The method comprises the steps of carrying out a first treatment on the surface of the B has a value of-5.775×10 -7 ；
Step (3), collecting and converting pressure measurement signals:
A. determining the type of the pressure element, and selecting a diaphragm type pressure element;
B. the signal amplification and conversion processing, wherein an operational amplifier is used for amplifying the voltage signal of the pressure element to be more than 1V and converting the voltage signal into a digital signal;
C. determining pressure measurement value, acquiring element voltage digital signal, testing, calibrating and correcting, calculating,
P＝K*V
wherein P is pressure, K is correction coefficient, and V is element voltage digital signal;
step (4), outputting a temperature pressure probe signal for flow rate measurement compensation: the probe outputs temperature and pressure signals through the cable for the ultrasonic gas sensor to use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310798086.6A CN116840506A (en) | 2023-06-30 | 2023-06-30 | Pipeline gas flow velocity measurement method and ultrasonic probe device |
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