CN109752056A - A kind of flow passage structure and ultrasonoscope scale of ultrasonic gas metering device - Google Patents
A kind of flow passage structure and ultrasonoscope scale of ultrasonic gas metering device Download PDFInfo
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Abstract
The present invention relates to a kind of flow passage structure of ultrasonic gas metering device and ultrasonoscope scales.It is characterized in that two mounting holes are arranged on rectangular runner, the first ultrasonic transducer and the second ultrasonic transducer are installed respectively on two mounting holes；Rectangular preceding straight tube is arranged in rectangular runner front end, and rectangular preceding straight tube front end is equipped with Venturi rectifying device, and Venturi rectifying device front end is equipped with honeycomb rectifier, and gas medium enters rectangular runner through honeycomb rectifier, Venturi rectifying device and rectangular preceding straight tube；The multiple sheet type commutator segments of setting in rectangular runner, multiple sheet type commutator segments are inserted into rectangular runner from gas outlet connector.The present invention by using multi-stage rectifying mode, the gas in pipeline can be effectively rectified into stable laminar condition using this flow passage structure, reduce the gas pulsation in ultrasonic measurement region, to improve the stability of the repeated and small flow of ultrasound examination, and the pressure loss is maximally reduced.
Description
Technical field
The present invention relates to a kind of flow passage structure of ultrasonic gas metering device and ultrasonoscope scales.
Background technique
Natural gas becomes the first choice of domestic energy resource structure as a kind of cleaning, the efficient good energy.With natural gas
Be widely used, as gas meter, flow meter used in city gas user's Trade Measures, it is especially heavy how to be able to achieve fair metering
It wants.With the construction of combustion gas gas pipeline and universal, gas meter, flow meter emerges in large numbers like the mushrooms after rain, from mechanically to electronic type, from biography
Diaphragm gauge unite to all-electronin ultrasonic wave gas meter, new concept new technology continues to bring out, the accuracy and use of various flowmeters
Range is also being continuously improved, and ultrasonic table gradually moves towards household from industrial circle due to its advanced technology, easily intelligence advantage
Field.Especially ultrasonic wave gas meter is just shown up prominently in gas meter, flow meter market with strong momentum in recent years, however ultrasonic wave fires
Gas meter also belongs to one kind of velocity flowmeter, more sensitive to the flow in measurement pipeline, will affect ultrasonic wave gas
Table metering performance, at the same it is higher to the installation requirement of ultrasonic transducer and flow passage structure position.
It is mostly used currently used for ultrasonic transducer mounting means used in household and Commercial ultrasound wave gas meter, flow meter first solid
It is scheduled on cover clamp, is then from top to bottom inserted into after rectifier and cover clamp and sprue are fixedly mounted again, due to this installation
Mode desired size precision is high, and positioning not easy to install, craftsmanship consistency is bad, and production efficiency is low, while rectification effect is owed
Good, the disturbance of runner interior air-flow is larger, and Small flowrate measurement precision and stability are poor.
Summary of the invention
Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a kind of ultrasonic gas metering devices
The technical solution of flow passage structure and ultrasonoscope scale.
A kind of flow passage structure of the ultrasonic gas metering device, it is characterised in that including rectangular runner, rectangular stream
Two mounting holes are set on road, the first ultrasonic transducer and the second ultrasonic transducer are installed respectively on two mounting holes；Institute
It states rectangular runner front end and rectangular preceding straight tube is set, rectangular preceding straight tube front end is equipped with Venturi rectifying device, Venturi rectifying device
Front end is equipped with honeycomb rectifier, and gas medium enters rectangular through honeycomb rectifier, Venturi rectifying device and rectangular preceding straight tube
Runner；The rectangular rear straight tube of the multiple sheet type commutator segments of setting in the rectangular runner, rectangular runner rear end setting constitutes outlet
Mouth connector, multiple sheet type commutator segments are inserted into rectangular runner from gas outlet connector.
The flow passage structure of a kind of ultrasonic gas metering device, it is characterised in that be all provided in described two mounting holes
Set sieve.
The flow passage structure of a kind of ultrasonic gas metering device, it is characterised in that described two mounting hole settings exist
The ipsilateral or heteropleural of rectangular runner is to penetrating.
A kind of flow passage structure of the ultrasonic gas metering device, it is characterised in that the top surface of the rectangular runner and
Bottom surface symmetrically opens up groove, and the sheet type commutator segment is vertically inserted into rectangular runner along groove.
The flow passage structure of a kind of ultrasonic gas metering device, it is characterised in that the honeycomb rectifier is by honeycomb
Net and outer layer square tube sheath form, and symmetrical inner groovy, inner groovy and Venturi rectifying device outer wall are provided on outer layer square tube sheath
Upper symmetrical convex part forms buckle structure.
A kind of flow passage structure of the ultrasonic gas metering device, it is characterised in that the Venturi rectifying device it is interior
Wall is made of retraction curved surface, and the outer angle constituted with rectangular preceding straight tube is θ, and θ is obtuse angle.
Utilize the ultrasonoscope scale of the flow passage structure, it is characterised in that: flow passage structure is mounted on supersonic wave metering
In the gas meter, flow meter inner cavity of table, base table air inlet installs control valve, and control valve commutates the gas medium entered through base table air inlet
90 degree and direction base table gas outlet central axes direction, the outlet of control valve are located at honeycomb rectifier top；Base table gas outlet passes through
Gas outlet bend pipe connects the gas outlet connector.
The method of ultrasound examination performance is improved using ultrasonoscope scale, it is characterised in that: gas medium is from base table
Air inlet enters base table shell, and gas medium commutates in the case where controlling valve action and is directed toward base table gas outlet central axes direction by 90 degree,
And the outlet of control valve is located above honeycomb rectifier, after gas medium is turned to by the air-flow of external disorder by control valve buffering
It is further buffered into base table inner cavity；Then the gas medium of base table inner cavity passes through honeycomb rectifier, Venturi rectifying
Device and rectangular preceding straight pipe three-level rectification, enhance the uniformity in flow field, so that steady air current, since the circulation of honeycomb rectifier is cut
Area is big, so that the crushing that gas medium generates is minimum；Gas medium introduces rectangular runner after front end rectifies, by air-flow
It is interior, it is equipped with multi-disc Thin Stainless Steel chip commutator segment in rectangular runner, air-flow can be further rectified into steady air flow
Laminar condition, is the nucleus of ultrasonic measurement in this region, laminar flow accessed after square tube runner rear end it is rectangular after straight tube,
It is connected to the outflow of base table gas outlet by gas outlet bend pipe, not only the pressure loss is small, while reducing the flow perturbation of measured zone
Improve the measurement accuracy of repeatability and small flow.
The present invention and existing structure comparison are as follows:
1, conventional ultrasonic wave flow passage structure cause small flow and quantification stability difference；
Flow passage structure arrival end of the invention first passes through after honeycomb rectifier rectifies the fluid prime of base table enclosure interior, then passes through
One section of Venturi rectifying device is crossed, air-flow is introduced in rectangular runner, multi-disc Thin Stainless Steel chip commutator segment is equipped in rectangular runner,
Air-flow is become uniform laminar condition by its purpose, is the nucleus of ultrasonic measurement in this region, laminar flow is after square tube runner
The rectangular rear straight tube for accessing rear end, is connected to the outflow of base table gas outlet by gas outlet bend pipe；Not only the pressure loss is small for the structure, together
When reduce the flow perturbation of measured zone and improve the measurement accuracy of repeatability and small flow；
2, the cover board of traditional mounting ultrasonic energy converter and flow path bodies are isolated structures, and metal lump flow is not easy installation calmly
Position, and there are installation errors for the cover board of installation ultrasonic transducer, when will lead to each installation between ultrasonic transducer
Propagation path generates deviation, to influence the consistency of ultrasonic wave base table；
The rectangular runner of measured zone uses whole design in the present invention, and ultrasonic transducer is directly installed on rectangular runner tube wall
On, there is no the propagation paths between ultrasonic transducer to generate offset issue for installation process, while in rectangular runner tube wall with
Flow level direction is equipped with a plurality of groove, is integrally inserted into convenient for sheet type commutator segment by rectangular flow channel tail, not only installation side
Just, at the same the installation of multi-layer thin chip commutator segment verticality is higher and non-loosening, rectification effect is reached best；
3, when two traditional ultrasonic transducers are with 45 degree of setting angles insertion measurement pipeline, the mounting hole at top of popping one's head in
Measurement tube wall can have certain cavity area, can there is gas at the top of ultrasonic transducer when having in pipeline has gas flowing
Body disturbance, will measure gas medium will have an impact；
It is equipped with sieve with rectangular runner tube wall end in the mounting hole of two ultrasonic transducers in the present invention, it can be to avoid because of ultrasound
The presence in wave probe apex cavity region, and influence measurement accuracy；
4, the gas that tradition enters through base table air inlet is to be directly entered base table shell, and the dynamics buffered to air-flow is inadequate,
Cause measurement unstable；
The present invention installs control valve in base table air inlet, and the gas medium entered through base table air inlet is commutated 90 degree simultaneously by control valve
It is directed toward base table gas outlet central axes direction, purpose is mainly the air-flow for the external disorder that will be entered by base table air inlet, is passed through
Control valve buffering turns further to buffer back into base table inner cavity, enhances buffering effect.
Detailed description of the invention
Fig. 1 is the flow passage structure of ultrasonic gas metering device of the present invention；
Fig. 2 is that the present invention is mounted on the intracorporal cross-sectional view of base table shell；
Fig. 3 is the plan view of flow passage structure of the present invention；
Fig. 4 is the cross-sectional view of flow passage structure of the invention；
Fig. 5 is the structural schematic diagram of honeycomb rectifier of the invention；
Fig. 6 is the partial sectional view that Venturi rectifying device of the invention is connect with rectangular preceding straight tube；
Fig. 7 is the flow passage structure of ultrasonic gas metering device correlation of the present invention；
In figure: the first ultrasonic transducer of 1-, the second ultrasonic transducer of 2-, 3- honeycomb rectifier, 4- gas medium, 5- text mound
In rectifier, the rectangular runner of 6-, the rectangular preceding straight tube of 6a-, 6b- it is rectangular after straight tube, 7- sheet type commutator segment, the gas outlet 9- connector,
10- sieve, 11- circuit board, 12- mounting hole, 15- ultrasonic gas metering device, 21- base table air inlet, 22- control valve,
The gas outlet 23- bend pipe, 24- base table gas outlet, 25- base table shell, 26- base table inner cavity.
Specific embodiment
The invention is further explained in the following combination with the attached drawings of the specification:
As shown in Figure 1, the flow passage structure of ultrasonic gas metering device of the present invention includes: the first ultrasonic transducer 1, the second surpasses
Acoustic wave transducer 2, honeycomb rectifier 3, Venturi rectifying device 5, rectangular runner 6, rectangular preceding straight tube 6a, it is rectangular after straight tube 6b, thin
Chip commutator segment 7, gas outlet connector 9, sieve 10 and mounting hole 12, two mounting holes 12 are placed in above flow passage structure and gas stream
Dynamic direction is symmetrically installed between two parties in parallel, and the same of rectangular runner is arranged in the first ultrasonic transducer 1, the second ultrasonic transducer 2
Side or heteropleural, ipsilateral installation need the mode of V-arrangement at 45 ° upward, are also possible to heteropleural to the mode penetrated；First ultrasonic waves
Energy device 1, the second ultrasonic transducer 2 are mounted in mounting hole 12, and are fixed by exterior snap component；As shown in figure 3,
When there is the flowing of gas medium 4 in pipeline, circuit board 11 utilizes the first ultrasonic transducer 1, the second ultrasonic wave transducer measured
Relationship propagation time difference △ T between device 2 directly proportional to the gas medium flow velocity in pipeline, is calculated the gas in pipeline
Rate-of flow.
Rectangular preceding straight tube is arranged in rectangular runner front end, and rectangular preceding straight tube front end is equipped with Venturi rectifying device, Venturi rectifying
Device front end is equipped with honeycomb rectifier, and gas medium is through honeycomb rectifier, Venturi rectifying device and the rectangular preceding straight tube side of entrance
Shape runner；Honeycomb rectifier 3, Venturi rectifying device 5 and rectangular preceding straight pipe 6a form front end three-level rectifier structure, the purpose is to
By arrival end disorder gas medium 4 after prime rectifies, the uniformity in flow field is improved, so that steady air current, since honeycomb is whole
Stream device actual internal area is big, so that the crushing that gas medium generates is minimum.
The rectangular rear straight tube of the multiple sheet type commutator segments of setting in rectangular runner, rectangular runner rear end setting constitutes gas outlet
Connector, multiple sheet type commutator segments are inserted into rectangular runner from gas outlet connector；Gas medium is after front end rectifies, into thin slice
Air-flow is further rectified into the laminar condition with steady air flow by formula commutator segment 7, which is the measurement of ultrasonic transducer
Region, and then gas outlet bend pipe 23 is inserted into 9 tail portion of gas outlet connector, is installed and is fixed by buckle structure.
Fig. 2 is that the present invention is mounted on the intracorporal cross-sectional view of base table shell, and base table air inlet 21, control are arranged on base table shell 25
Valve 22, base table inner cavity 25, gas outlet bend pipe 23, base table air inlet 24, base table air inlet 21, base table air inlet 24 and gas meter shell
In the same plane, the ultrasonic gas metering device 15 that flow passage structure and circuit board 11 are constituted is placed in base table shell 25 to body 25
Inside, 3 vertical direction of inlet honeycomb rectifier and base table air inlet 21 and 24 center of base table air inlet in same plane,
It is placed in 22 lower position of 21 direction of base table air inlet and control valve simultaneously, the square structure of 23 front end of gas outlet bend pipe is inserted into ultrasound
The gas outlet connector 9 of wave gas-metering device 15 is tightly connected by buckle installation, the round tube knot of 23 other end of gas outlet bend pipe
Sealing ring insertion base table gas outlet 24 is embedded with outside structure to be tightly connected.
The circular tube external of 22 arrival end of control valve, which is embedded with sealing ring, can be inserted directly into the sealed connection of base table air inlet 21, control
22 outlet end of valve processed is towards 24 direction of base table gas outlet, and axis direction and 24 axis of base table air inlet 21 and base table gas outlet
In same plane；Control valve 22 selects 90 ° of bend pipe structure valves, i.e. valve inlet and outlet shape corner in 90 °, controls valve outlet
End is towards base table gas outlet direction, and axis direction and base table air inlet and base table gas outlet axis are in same plane, purpose
The air-flow that external disorder will mainly be entered by base table air inlet 21, is turned by valve buffering back into base table inner cavity 25 into one
The buffering of step enhances buffering effect.
Fig. 3 is the plan view of flow passage structure of the present invention, the mounting hole 12 of ultrasonic transducer and rectangular runner top horizontal
12 center line of mounting hole of face angle aperture at 45 °, two ultrasonic transducers is parallel with gas flow direction, and center line is placed in
15 top planes central symmetry position of ultrasonic gas metering device.Sieve 10 is mounted in ultrasonic transducer mounting hole 12,
With 15 top inner wall of ultrasonic gas metering device in a plane, main purpose is solved because of the first ultrasonic transducer 1, the
12 bottom section of mounting hole after the installation of two ultrasonic transducers 2 in ultrasonic transducer, which has cavity, to be existed, when gas flows
Will form flow perturbation, it will influence Small flowrate measurement precision the problem of.
Fig. 4 is the cross-sectional view of flow passage structure of the invention, and it is identical that the top surface of rectangular runner with bottom surface is provided with a plurality of length
Between from equal symmetrical groove, direction is parallel with gas flow direction, groove starting point be rectangular preceding straight tube 6a after, end end
For 9 initial position of gas outlet connector, sheet type commutator segment 7 is rectangle structure, by 9 rear end of gas outlet connector along gas flowing side
To parallel direction groove, sheet type commutator segment 7 is installed after being inserted by gas outlet bend pipe 23 and is fixed by rear end, after the installation is completed multi-disc
The equal each plane of spacing is parallel between sheet type commutator segment 7.7 region of sheet type commutator segment is the measurement zone of ultrasonic transducer
Domain influences measuring accuracy and stability between the quality of the region rectification effect, and laminar condition measured zone metering performance is most
It is good, therefore forward end gas turbulent state is mainly converted to laminar condition by sheet type commutator segment 7, improve measurement accuracy and steady
It is qualitative.
Fig. 5 is the structural schematic diagram of honeycomb rectifier of the invention, honeycomb rectifier 3 by equilateral 6 angle-style Cellular Networks and
Outer layer square tube sheath composition, is provided with symmetrical inner groovy on outer layer square tube sheath, and symmetrical convex on 5 outer wall of Venturi rectifying device
Type part forms buckle structure, and precision, which combines, to be fixedly mounted.In honeycomb rectifier 3 by it is multiple it is equal in magnitude, be evenly distributed positive six
Side shape composition, wherein the side length L1 of each regular hexagon is 3mm, the adjacent side thickness M of every two hexagon is 0.2mm.It is led
Syllabus is that outer gas stream disorder gas medium is become equally distributed air-flow by prime rectification, improves measurement accuracy and steady
It is qualitative.
Fig. 6 is the partial sectional view that Venturi rectifying device of the invention is connect with rectangular preceding straight tube, in Venturi rectifying device 5
Wall is made of retraction curved surface, is 120 ° with the rectangular preceding straight tube 6a outer angle theta constituted, Venturi rectifying device 5 is from entrance to side
The front end straight tube 6a is defined as length L, L=10mm before shape.It is equal extraneous turbulent flow further can be become into distribution with this configuration
The identical steady air flow in even direction is conducive to improve measurement stability.
Fig. 7 is the flow passage structure of ultrasonic gas metering device correlation of the present invention, and two mounting holes 12 are placed in runner knot
Above and below structure, and to aperture is penetrated, two apertures are equal in magnitude and concentric at lower wall angle at 45 ° on rectangular runner, the first ultrasound
Wave transducer 1, the second ultrasonic transducer 2 are fixed in mounting hole 12 by snap part respectively, after being installed, two
Energy converter axial direction is completely coincident.
Using the ultrasonoscope scale of above-mentioned flow passage structure, flow passage structure is mounted on the base table inner cavity of ultrasonoscope scale
In, base table air inlet installs control valve, and control valve is by 90 degree of the gas medium entered through base table air inlet commutation and is directed toward base table
Gas outlet central axes direction, the outlet of control valve are located above honeycomb rectifier；Base table gas outlet is connected by gas outlet bend pipe
Gas outlet connector.
Gas medium of the invention enters base table shell from base table air inlet, and gas medium commutates 90 in the case where controlling valve action
Degree and be directed toward base table gas outlet central axes direction, gas medium by external disorder air-flow by control valve buffering turn back into
Base table inner cavity is further buffered, and buffering effect is enhanced；Since the outlet of control valve is located above honeycomb rectifier, i.e., from
The gas medium of control valve discharge will not directly be discharged from honeycomb rectifier, therefore the air-flow of external disorder can be allowed in base table inner cavity
Sufficiently buffered；Then the gas medium of base table inner cavity passes through honeycomb rectifier, Venturi rectifying device and rectangular preceding straight pipe
Three-level rectification, improves the uniformity in flow field, so that steady air current, since honeycomb rectifier actual internal area is big, so that gas
The crushing that medium generates is minimum；Gas medium introduces air-flow in rectangular runner after front end rectifies, and is equipped in rectangular runner
Air-flow, can be further rectified into the laminar condition with steady air flow, be in this region by multi-disc Thin Stainless Steel chip commutator segment
The nucleus of ultrasonic measurement, laminar flow accessed after square tube runner rear end it is rectangular after straight tube, be connected to by gas outlet bend pipe
The outflow of base table gas outlet, not only the pressure loss is small, while the flow perturbation for reducing measured zone improves repeatability and small stream
The measurement accuracy of amount.
The present invention, can be effectively whole by the gas in pipeline using this flow passage structure by using the mode of multi-stage rectifying
Stable laminar condition is flowed into, the gas pulsation in ultrasonic measurement region is reduced, to improve the repetition of ultrasound examination
The stability of property and small flow, and maximally reduced the pressure loss.Meanwhile ultrasonic transducer core measured zone,
Rectangular runner uses overall construction design, and internal multilayer commutator segment is integrally inserted into runner by gas outlet connector, can not only improve
Production efficiency, while guaranteeing to produce in batches the consistency of mounting process.
Flow passage structure design of the invention, is applicable not only to ultrasonic gas measuring instrument, is also applied for mems heating type gas
Flow instrument.
Claims (8)
1. a kind of flow passage structure of ultrasonic gas metering device, it is characterised in that including rectangular runner, be arranged on rectangular runner
Two mounting holes install the first ultrasonic transducer and the second ultrasonic transducer on two mounting holes respectively；The rectangular stream
Rectangular preceding straight tube is arranged in road front end, and rectangular preceding straight tube front end is equipped with Venturi rectifying device, the cooperation of Venturi rectifying device front end
Honeycomb rectifier is set, and gas medium enters rectangular runner through honeycomb rectifier, Venturi rectifying device and rectangular preceding straight tube；It is described
The rectangular rear straight tube of the multiple sheet type commutator segments of setting in rectangular runner, rectangular runner rear end setting constitutes gas outlet connector, more
A sheet type commutator segment is inserted into rectangular runner from gas outlet connector.
2. a kind of flow passage structure of ultrasonic gas metering device according to claim 1, it is characterised in that described two
Sieve is respectively provided in mounting hole.
3. a kind of flow passage structure of ultrasonic gas metering device according to claim 1, it is characterised in that described two
The ipsilateral or heteropleural of rectangular runner is arranged in penetrating in mounting hole.
4. a kind of flow passage structure of ultrasonic gas metering device according to claim 1, it is characterised in that described rectangular
The top and bottom of runner symmetrically open up groove, and the sheet type commutator segment is vertically inserted into rectangular runner along groove.
5. a kind of flow passage structure of ultrasonic gas metering device according to claim 1, it is characterised in that the honeycomb
Rectifier is made of Cellular Networks and outer layer square tube sheath, is provided with symmetrical inner groovy, inner groovy and Wen Qiu on outer layer square tube sheath
In on rectifier outer wall symmetrical convex part form buckle structure.
6. a kind of flow passage structure of ultrasonic gas metering device according to claim 1, it is characterised in that the text mound
In the inner wall of rectifier be made of retraction curved surface, the outer angle constituted with rectangular preceding straight tube is θ, and θ is obtuse angle.
7. a kind of ultrasonoscope scale using flow passage structure described in claim 1, it is characterised in that: flow passage structure is mounted on
In the base table inner cavity of ultrasonoscope scale, base table air inlet installs control valve, the gas that control valve will enter through base table air inlet
90 degree of medium commutation and direction base table gas outlet central axes direction, the outlet of control valve are located at honeycomb rectifier top；Base table goes out
Port connects the gas outlet connector by gas outlet bend pipe.
8. a kind of method for improving ultrasound examination performance using ultrasonoscope scale described in claim 7, it is characterised in that:
Gas medium enters base table shell from base table air inlet, and gas medium commutates in the case where controlling valve action and is directed toward base table outlet by 90 degree
Mouth central axes direction, and the outlet of control valve is located above honeycomb rectifier, gas medium passes through control by the air-flow of external disorder
Valve buffering processed turns further to be buffered back into base table inner cavity；Then the gas medium of base table inner cavity is rectified by honeycomb
Device, Venturi rectifying device and rectangular preceding straight pipe three-level rectification, enhance the uniformity in flow field, so that steady air current, due to bee
Nest rectifier actual internal area is big, so that the crushing that gas medium generates is minimum；Gas medium is after front end rectifies, by air-flow
It introduces in rectangular runner, multi-disc Thin Stainless Steel chip commutator segment is equipped in rectangular runner, air-flow can be further rectified into tool
There is the laminar condition of steady air flow, be the nucleus of ultrasonic measurement in this region, laminar flow accesses rear end after square tube runner
It is rectangular after straight tube, by gas outlet bend pipe be connected to base table gas outlet outflow, not only the pressure loss is small, while reducing measurement zone
The flow perturbation in domain improves the measurement accuracy of repeatability and small flow.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811633147 | 2018-12-29 | ||
| CN2018116331479 | 2018-12-29 |
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| CN110285861A (en) * | 2019-06-23 | 2019-09-27 | 上海玮轩电子科技有限公司 | A kind of ultrasonic flowmeter |
| CN111964739A (en) * | 2020-09-10 | 2020-11-20 | 宁波力擎超声科技有限公司 | Flow channel structure of airflow ultrasonic flowmeter |
| CN113418571A (en) * | 2021-06-18 | 2021-09-21 | 重庆市山城燃气设备有限公司 | Gas meter with anti-misconnection function, anti-misconnection method and gas management system |
| CN113418572A (en) * | 2021-06-18 | 2021-09-21 | 重庆市山城燃气设备有限公司 | Signal authenticity detection system and method of flowmeter and gas metering equipment |
| CN113639812A (en) * | 2021-08-17 | 2021-11-12 | 上海真兰仪表科技股份有限公司 | Leading rectification mechanism of ultrasonic gas meter |
| CN114459550A (en) * | 2022-01-12 | 2022-05-10 | 青岛乾程科技股份有限公司 | Novel ultrasonic gas meter and using method |
| CN114812708A (en) * | 2022-05-16 | 2022-07-29 | 瑞纳智能设备股份有限公司 | Measuring tube structure with rectification function and ultrasonic meter |
| CN115655394A (en) * | 2022-09-19 | 2023-01-31 | 青岛乾程科技股份有限公司 | Novel ultrasonic gas flowmeter unit and gas meter using same |
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| CN114459550A (en) * | 2022-01-12 | 2022-05-10 | 青岛乾程科技股份有限公司 | Novel ultrasonic gas meter and using method |
| CN114812708A (en) * | 2022-05-16 | 2022-07-29 | 瑞纳智能设备股份有限公司 | Measuring tube structure with rectification function and ultrasonic meter |
| CN115655394A (en) * | 2022-09-19 | 2023-01-31 | 青岛乾程科技股份有限公司 | Novel ultrasonic gas flowmeter unit and gas meter using same |
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