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In recent years, the most eye-catching gas meters are undoubtedly ultrasonic gas meters and ultrasonic gas flow meters , which can even be said to be the highlights that manufacturers have been chasing in recent years
.
But frankly speaking, it is an indisputable fact that all the ultrasonic civil gas meters produced on a large scale in the market currently use the bundled integration scheme of Japan's Panasonic
.
Different from the manufacturers of large-diameter gas flow meters, which are European and American, as well as Japanese, and domestic manufacturers with their own patented technology and product production, in terms of small-diameter ultrasonic gas meters, the dominance of Panasonic’s solution is particularly eye-catching.
.
Flowmeter.
But frankly speaking, it is an indisputable fact that all the ultrasonic civil gas meters produced on a large scale in the market currently use the bundled integration scheme of Japan's Panasonic
.
Different from the manufacturers of large-diameter gas flow meters, which are European and American, as well as Japanese, and domestic manufacturers with their own patented technology and product production, in terms of small-diameter ultrasonic gas meters, the dominance of Panasonic’s solution is particularly eye-catching.
.
Since 2019, many meter manufacturers have claimed to have their own ultrasonic gas meter solutions, as well as some means and content of display and publicity, but in marketing and product sales, they have always been "half-covered" and unable to It came out in a big way
.
As far as the author's understanding of the ultrasonication of small-caliber civil gas meters is concerned, we are still in the initial stage of development
.
Similar to the law of development of many industries, in the subdivision of ultrasonic civil gas meters, Chinese enterprises are on the road from technology introduction to technology absorption to independent research and development.
It is a topic worthy of attention
.
.
As far as the author's understanding of the ultrasonication of small-caliber civil gas meters is concerned, we are still in the initial stage of development
.
Similar to the law of development of many industries, in the subdivision of ultrasonic civil gas meters, Chinese enterprises are on the road from technology introduction to technology absorption to independent research and development.
It is a topic worthy of attention
.
The ultrasonic gas meter is mainly composed of three components: PCBA electronic circuit board including metering algorithm, effective two-way flow channel, and ultrasonic transducer
.
Its main advantages are high precision, wide turndown ratio, no pressure loss, measurement of bidirectional flow, accurate measurement of pulsating flow, insensitivity to deposits, no moving parts, and low maintenance costs
.
Relying on its more than 30 years of market application, Panasonic has perfected the entire design scheme and made it meet the standard requirements of gas metering
.
At present, the biggest problems of various schemes proposed at home and abroad are whether the accuracy of measurement can reach the standard, whether the stability is long-term reliable, whether the production consistency can reach the goal, and whether it can be maintained for a long time in industrial production
.
From a practical point of view, the idea of developing the three major components separately and then combining them is unsuccessful
.
The PCBA or chip manufacturers that set the algorithm, whether it is a number of domestic companies or even the top international chip manufacturer Texas Instruments (TI), have launched chips or PCBAs, but these manufacturers have no in-depth contact with the entire measurement system and lack a large number of them.
The long-term flow channel experiment and practice, the launched chip and even the PCBA are all feasible in the laboratory environment, or matching with several unique partners, the flow correction coefficient cannot and is impossible to achieve multi-effect matching , Matching on multiple occasions
.
In other words, the ultrasonic metering chip launched from the chip manufacturer cannot reach the precision and accuracy of the gas flowmeter so far
.
.
Its main advantages are high precision, wide turndown ratio, no pressure loss, measurement of bidirectional flow, accurate measurement of pulsating flow, insensitivity to deposits, no moving parts, and low maintenance costs
.
Relying on its more than 30 years of market application, Panasonic has perfected the entire design scheme and made it meet the standard requirements of gas metering
.
At present, the biggest problems of various schemes proposed at home and abroad are whether the accuracy of measurement can reach the standard, whether the stability is long-term reliable, whether the production consistency can reach the goal, and whether it can be maintained for a long time in industrial production
.
From a practical point of view, the idea of developing the three major components separately and then combining them is unsuccessful
.
The PCBA or chip manufacturers that set the algorithm, whether it is a number of domestic companies or even the top international chip manufacturer Texas Instruments (TI), have launched chips or PCBAs, but these manufacturers have no in-depth contact with the entire measurement system and lack a large number of them.
The long-term flow channel experiment and practice, the launched chip and even the PCBA are all feasible in the laboratory environment, or matching with several unique partners, the flow correction coefficient cannot and is impossible to achieve multi-effect matching , Matching on multiple occasions
.
In other words, the ultrasonic metering chip launched from the chip manufacturer cannot reach the precision and accuracy of the gas flowmeter so far
.
I am afraid some readers will question: why do heat meters and water meters already have mature ultrasonic measurement chips?
I am afraid some readers will question: why do heat meters and water meters already have mature ultrasonic measurement chips? The key is the difference in the properties of water (hot and cold) and gas
.
Although water and gas have more in common, such as pressure-driven flow direction, water quality and temperament are more complicated, but temperament can change its volume and density in any link anytime, anywhere due to its strong discontinuity, so its The measurement difficulty is much higher than that of water.
Many manufacturers have proposed to use the optimized (mainly to strengthen the measurement sensitivity) water ultrasonic metering chip for gas, but the results are all failures, which is the reason
.
.
Although water and gas have more in common, such as pressure-driven flow direction, water quality and temperament are more complicated, but temperament can change its volume and density in any link anytime, anywhere due to its strong discontinuity, so its The measurement difficulty is much higher than that of water.
Many manufacturers have proposed to use the optimized (mainly to strengthen the measurement sensitivity) water ultrasonic metering chip for gas, but the results are all failures, which is the reason
.
The second important component: the flow channel, its experience is mainly accumulated in various gas production and use units, even the gas meter manufacturers closest to the relevant industry, more of which are only intuitive in the laboratory, calibration and after-sales occasions Actual exposure to gas
.
In fact, the accumulation of experience in the flow channel is the earliest among the three components.
In the era of pure mechanical gas meters, there were a lot of relevant observations and records.
However, these records are mainly in the hands of manufacturers with the main business of mechanical watches, which may be difficult to cause.
more attention
.
On the contrary, solution manufacturers who need to match the gas flow rate, forward and reverse gas volume, small gas volume and other experience in the flow channel will easily fall into the flow correction coefficient mentioned above due to the lack of sufficient experimental data and actual data support accumulated over many years.
, The error in the algorithm is large, the optimization is inaccurate, and the final result is inaccurate measurement
.
.
In fact, the accumulation of experience in the flow channel is the earliest among the three components.
In the era of pure mechanical gas meters, there were a lot of relevant observations and records.
However, these records are mainly in the hands of manufacturers with the main business of mechanical watches, which may be difficult to cause.
more attention
.
On the contrary, solution manufacturers who need to match the gas flow rate, forward and reverse gas volume, small gas volume and other experience in the flow channel will easily fall into the flow correction coefficient mentioned above due to the lack of sufficient experimental data and actual data support accumulated over many years.
, The error in the algorithm is large, the optimization is inaccurate, and the final result is inaccurate measurement
.
The last component: the transducer, to be precise, is the sensor part of the transducer, and it is also the crux of a very large dislocation configuration at present
.
Generally, there are two production methods for transducers at present: self-produced by watch factories and professional sensor manufacturers
.
The advantage of the former is undeniable, it can best match your complete set of products and meet all your needs; the disadvantage is that watch manufacturers are not sensor manufacturers after all, just like car manufacturers may not necessarily be able to make steel, sensors have their own specialties Therefore, professional equipment investment is required for matching to ensure precision, consistency, stability and cost-effectiveness
.
If you make your own sensors, the quantity is limited first, and secondly, can the product quality and experience of self-designed sensors really meet the measurement needs? Judging from the current public information, there are still many doubts
.
Because the first and only task to be satisfied by the transducers produced by anyone is to match their own products.
The entire closed-loop system: algorithms, flow channels, and transducers all have their own characteristics, and ultimately they are the same as the complete set of products currently provided by Panasonic.
In the same way, there is no way to sell it separately
.
Of course, for watch manufacturers, there may never be an idea to sell transducers widely, but this means that the mass production of transducers will be limited, the corresponding cost will always be high, and ultimately the entire product will be affected.
Pricing will still have an impact
.
sensor .
Generally, there are two production methods for transducers at present: self-produced by watch factories and professional sensor manufacturers
.
The advantage of the former is undeniable, it can best match your complete set of products and meet all your needs; the disadvantage is that watch manufacturers are not sensor manufacturers after all, just like car manufacturers may not necessarily be able to make steel, sensors have their own specialties Therefore, professional equipment investment is required for matching to ensure precision, consistency, stability and cost-effectiveness
.
If you make your own sensors, the quantity is limited first, and secondly, can the product quality and experience of self-designed sensors really meet the measurement needs? Judging from the current public information, there are still many doubts
.
Because the first and only task to be satisfied by the transducers produced by anyone is to match their own products.
The entire closed-loop system: algorithms, flow channels, and transducers all have their own characteristics, and ultimately they are the same as the complete set of products currently provided by Panasonic.
In the same way, there is no way to sell it separately
.
Of course, for watch manufacturers, there may never be an idea to sell transducers widely, but this means that the mass production of transducers will be limited, the corresponding cost will always be high, and ultimately the entire product will be affected.
Pricing will still have an impact
.
Another method is to cooperate with professional sensor manufacturers to customize transducers that meet your needs
.
Judging from the information collected by the author and some transducer samples obtained, transducer manufacturers are very motivated, and they also hope to provide some standard parts to expand the market scale
.
But here is another paradox mentioned repeatedly: if the final product does not meet the measurement accuracy due to the matching problem, then the product is a failure, and there is no hope of mass production
.
However, if special matching is carried out, it will return to the origin of small number and customization
.
.
Judging from the information collected by the author and some transducer samples obtained, transducer manufacturers are very motivated, and they also hope to provide some standard parts to expand the market scale
.
But here is another paradox mentioned repeatedly: if the final product does not meet the measurement accuracy due to the matching problem, then the product is a failure, and there is no hope of mass production
.
However, if special matching is carried out, it will return to the origin of small number and customization
.
So, is it only Panasonic's current complete set of products that is the way out for marketization? The author does not agree with this view
.
Looking at the relevant papers of various scientific research institutions on fluid mechanics in the past three decades, as well as the research reports on the installation effect of the flowmeter and its evaluation, and calculating the flow field adaptability of several typical channel arrangements in a specific flow field, The following two are the possible directions for the future large-scale production of specialized manufacturers and the final integration of watch factory solutions:
.
Looking at the relevant papers of various scientific research institutions on fluid mechanics in the past three decades, as well as the research reports on the installation effect of the flowmeter and its evaluation, and calculating the flow field adaptability of several typical channel arrangements in a specific flow field, The following two are the possible directions for the future large-scale production of specialized manufacturers and the final integration of watch factory solutions:
Breakthrough in quantitative analysis of ultrasonic energy decay in gas
Breakthrough in quantitative analysis of ultrasonic energy decay in gas Since the flowmeter mainly relies on the signal delay difference of the ultrasonic pulse in the forward and reverse flow conditions to obtain the flow velocity information of the fluid, the accuracy of the delay estimation also determines the measurement accuracy and performance that the flowmeter can achieve
.
In the problem of delay estimation of ultrasonic signals, the influence of random time and frequency variation of the channel on the received signal is the main reason that it is difficult to improve the estimation accuracy
.
High-precision delay estimation is usually based on the premise that the channel is stable and the normalized waveform of the received signal is basically unchanged
.
Simply put, it is to adjust the ultrasonic signal of the transducer to high frequency, design more points (usually 2-point transducers at present), etc.
, which can form decisive guiding significance for several types of flow channels.
These standardized and precise positioning can effectively compensate for the accuracy deviation under the high-frequency enhancement of the ultrasonic signal of the transducer, and provide an achievable range for the compensation of the metering algorithm
.
.
In the problem of delay estimation of ultrasonic signals, the influence of random time and frequency variation of the channel on the received signal is the main reason that it is difficult to improve the estimation accuracy
.
High-precision delay estimation is usually based on the premise that the channel is stable and the normalized waveform of the received signal is basically unchanged
.
Simply put, it is to adjust the ultrasonic signal of the transducer to high frequency, design more points (usually 2-point transducers at present), etc.
, which can form decisive guiding significance for several types of flow channels.
These standardized and precise positioning can effectively compensate for the accuracy deviation under the high-frequency enhancement of the ultrasonic signal of the transducer, and provide an achievable range for the compensation of the metering algorithm
.
Flow channel transducer integration
Flow channel transducer integration This method is to partially dismantle the products that can actually be independent algorithms, chips and other products that can not be produced by the watch factory, and continue to maintain standardized products, while the transducer is completely merged with the flow channel for splicing or direct assembly.
In this way, the transducer and the flow channel are integrated, so that a variety of flow channels can be made.
Same as the purpose in the above scheme 1, it provides a standardized ultrasonic feedback signal, which is helpful for the processing of the metering algorithm and the chip, and finally realizes the The emergence of standardized products capable of meeting metrological requirements
.
In this way, the transducer and the flow channel are integrated, so that a variety of flow channels can be made.
Same as the purpose in the above scheme 1, it provides a standardized ultrasonic feedback signal, which is helpful for the processing of the metering algorithm and the chip, and finally realizes the The emergence of standardized products capable of meeting metrological requirements
.
The current international environment and market status quo require China to gradually carry out localization and replacement in various industries, and the sub-product of ultrasonic gas meters will naturally have such expectations
.
The author sincerely hopes that domestic colleagues can improve their ultrasonic gas meter products as soon as possible, and put them on the market in large quantities, and put this star product in the gas industry into the hands of the Chinese
.
.
The author sincerely hopes that domestic colleagues can improve their ultrasonic gas meter products as soon as possible, and put them on the market in large quantities, and put this star product in the gas industry into the hands of the Chinese
.
Original title: When technology is introduced to independent research and development, how should watch companies take the road of "household ultrasonic gas meters"?
