Safe ultrasonic gas meter

Abstract

The invention relates to the technical field of gas meters, in particular to a safety type ultrasonic gas meter which connects a user with a gas company terminal through a gas pipeline and is used for measuring the flow of gas flowing through the interior of the ultrasonic gas meter, and an intelligent switch is wirelessly connected with the ultrasonic gas meter. The controller is used for controlling the on-off state of the ultrasonic gas meter; the ultrasonic gas meter can continuously monitor and control micro-flow, abnormal pressure, abnormal flow, beyond reasonable use safety time, monitor and control gas leakage in front of and behind the meter, intelligently check micro-leakage, monitor and control ultra-high temperature, delay gas use and valve closing protection, alarm for water-immersed air entering, external force vibration or meter disassembly monitoring and the like. The gas safety management of the user side is digitized, easy to prevent and control and high in efficiency, the risk can be managed and controlled in advance, the occurrence rate of gas accidents is reduced, and the life and property safety of people is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of gas meters, in particular to a safe ultrasonic gas meter. Background Art

[0002] Ultrasonic gas meter is a new generation of high-tech all-electronic metering instrument developed in accordance with the national standard GB / T 39841-2021. It is a kind of gas flow meter that uses the principle that the time difference of ultrasonic wave propagating in the gas medium along the downstream and upstream is proportional to the gas flow rate. By receiving the ultrasonic signal of the paired transducer, the signal processing unit composed of the signal acquisition circuit and the microcontroller performs calculation processing, display, storage and recording of the measurement results, and has the functions of IoT remote transmission and valve control. It has many advantages such as no mechanical wear, stable and reliable use, high measurement accuracy, small starting flow, and wide range ratio. The main performance indicators have reached the international leading level and can be widely used in industrial and commercial natural gas trade settlement. Supports 3 settlement methods: prepaid amount mode, background pre-settlement mode and background settlement mode.

[0003] Product implementation standards: Implement GB / T 39841-2021 "Ultrasonic Gas Meter" national standard Implementation of JJG1190-2022 Ultrasonic Gas Meter Verification Procedure TCGAS006-2019 Gas Smart Meter Reading System Based on Narrowband Internet of Things (NB-IoT) Technology Comply with GB / T 3836-2021 explosion-proof standard It complies with GB / T 3836.1-2021 "Explosive Atmospheres Part 1: General Requirements for Equipment" and GB / T3836.4-2021 "Explosive Atmospheres Part 4: Equipment Protected by Intrinsic Safety "i"" standards; the explosion-proof mark is Exib II BT3 Gb, which is suitable for Zone 1 and Zone 2, containing Class IIA~IIB, T1~T4 explosive gas mixtures; it has passed the inspection of the National Explosion-proof Electrical Products Quality Inspection Center and obtained the explosion-proof certificate.

[0004] Gas is one of the important infrastructures of urban life. The prevention of gas safety accidents and the management of hidden dangers at the user end (residential users, industrial and commercial users) are important topics in the gas industry, which are related to people's livelihood and are an important part of urban public safety. The difficulties in gas safety management at the user end include blind box management and difficulty in prevention and control; difficult and inefficient home security inspections; lack of a sound information-based and intelligent risk control mechanism; wide social impact in the event of a safety accident; difficulty in pre-risk control and busy with post-event emergency response, etc. Summary of the invention

[0005] The main purpose of the present invention is to provide a safe ultrasonic gas meter to solve the problems proposed in the related art, such as blind box management and difficulty in prevention and control; difficult and inefficient home security checks; lack of a sound information-based and intelligent risk management mechanism; wide social impact in the event of safety accidents; difficulty in pre-emptive risk management and busy with post-event emergency response.

[0006] In order to achieve the above object, according to one aspect of the present invention, there is provided a safety ultrasonic gas meter, comprising: an ultrasonic gas meter, the ultrasonic gas meter connects a user to a gas company terminal via a gas pipeline, the ultrasonic gas meter is used to measure the gas flow rate flowing through the ultrasonic gas meter; An intelligent safety valve, which is connected to an ultrasonic gas meter through a gas pipeline. The intelligent safety valve is fixedly arranged at the input end of the ultrasonic gas meter. The intelligent safety valve is used to control the on-off status of the gas in the gas pipeline. When the intelligent safety valve is opened, gas flows in the gas pipeline. When the intelligent safety valve is closed, gas stops flowing in the gas pipeline. The intelligent switch is wirelessly connected to the intelligent safety valve to control the opening and closing state of the intelligent safety valve. The intelligent switch is wirelessly connected to the ultrasonic gas meter to control the opening and closing state of the ultrasonic gas meter.

[0007] Furthermore, a first pressure difference sensor is fixedly provided at the input end of the intelligent safety valve, and the first pressure difference sensor is used to detect leakage of the gas pipeline at the front section of the house.

[0008] Furthermore, a second pressure difference sensor is fixedly provided at the output end of the intelligent safety valve, and the second pressure difference sensor is used to detect leakage of the user's indoor gas pipeline.

[0009] Furthermore, the working principle of the ultrasonic gas meter is as follows: the time difference between the ultrasonic wave in the downstream direction and the reverse direction in the gas medium is proportional to the average flow velocity of the gas. The gas flow velocity is calculated by calculating the relationship between the ultrasonic wave propagation time difference and the propagation distance. The gas flow rate can be obtained by multiplying the flow velocity and the cross-sectional area of ​​the sound channel in the gas meter pipeline. The relationship between the ultrasonic wave downstream and reverse propagation time and each quantity is: ; ; Where: is the time for the ultrasonic wave to propagate in the fluid in the opposite direction. is the time it takes for the ultrasonic wave to propagate downstream in the fluid, is the vocal tract length, is the speed of sound waves propagating in the fluid, is the average axial velocity of the fluid, is the vocal tract angle; Two formulas can be used to express the fluid flow rate: ; Multiply by the flow area A to get the volume flow rate ,like: ; Furthermore, a manual valve is fixedly provided at the input end of the intelligent safety valve, and the manual valve is connected to the intelligent safety valve through a gas pipeline.

[0010] Furthermore, an air inlet is fixedly provided at the input end of the manual valve, and the air inlet guides the gas from the gas pipeline to the manual valve.

[0011] Furthermore, a gas stove is fixedly provided at the output end of the ultrasonic gas meter, and the ultrasonic gas meter is connected to the gas stove through a gas pipeline.

[0012] Furthermore, the NB-IoT data collected by the intelligent safety valve is uploaded to the cloud platform.

[0013] Furthermore, the cloud platform is connected to a leakage monitoring platform, a gas company terminal, a property company terminal and a mobile phone APP. The leakage monitoring platform is used to timely discover and deal with gas leakage safety hazards, and the property company terminal checks the leakage point and evacuates the crowd.

[0014] Furthermore, the gas company terminal stops the delivery of gas after receiving the gas leakage information, and the mobile phone APP is used to remind the user of the occurrence of the gas leakage accident.

[0015] Compared with the prior art, the present invention has the following beneficial effects: ultrasonic gas meters can continuously monitor and control small flow rates, monitor and control abnormal pressures, monitor and control abnormal flow rates, monitor and control gas leakages before and after the meter that exceed the reasonable use safety time, intelligent security inspection for micro-leakages, monitor and control ultra-high temperatures, protect against delayed valve closing when using gas, alarm for water-immersion air intrusion, monitoring of external force vibration or meter removal, etc., making user-side gas safety management digital, easy to prevent and control, highly efficient, and capable of pre-emptive risk control, thereby reducing the incidence of gas accidents and protecting people's lives and property. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an application scenario diagram of the present invention; Figure 2 It is a schematic diagram of the working principle of the present invention. DETAILED DESCRIPTION

[0017] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0018] See also Figure 1 and Figure 2 ,This embodiment provides a safe ultrasonic gas meter, including: an ultrasonic gas meter, the ultrasonic gas meter connects the user with the gas company terminal through a gas pipeline, and the ultrasonic gas meter is used to measure the gas flow flowing through the ultrasonic gas meter; Intelligent safety valve, which is connected to the ultrasonic gas meter through the gas pipeline. The intelligent safety valve is fixed at the input end of the ultrasonic gas meter. The intelligent safety valve is used to control the on-off status of the gas in the gas pipeline. When the intelligent safety valve is opened, there is gas flowing in the gas pipeline. When the intelligent safety valve is closed, the gas stops flowing in the gas pipeline. Smart switch, the smart switch is wirelessly connected to the smart safety valve to control the opening and closing status of the smart safety valve, and the smart switch is wirelessly connected to the ultrasonic gas meter to control the opening and closing status of the ultrasonic gas meter.

[0019] A first pressure difference sensor is fixedly provided at the input end of the intelligent safety valve, and the first pressure difference sensor is used to detect leakage of the gas pipeline at the front section of the house.

[0020] A second pressure difference sensor is fixedly provided at the output end of the intelligent safety valve, and the second pressure difference sensor is used to detect leakage of the user's indoor gas pipeline.

[0021] The working principle of ultrasonic gas meter is: the time difference of ultrasonic wave in the downstream and upstream direction in the gas medium is proportional to the average flow velocity of the gas. The gas flow velocity is calculated by calculating the relationship between the propagation time difference of ultrasonic wave and the propagation distance. The product of the flow velocity and the cross-sectional area of ​​the sound channel in the gas meter pipeline can be used to obtain the gas flow. The relationship between the ultrasonic wave downstream and upstream propagation time and each quantity is as follows: ; ; Where: is the time for the ultrasonic wave to propagate in the fluid in the opposite direction. is the time it takes for the ultrasonic wave to propagate downstream in the fluid, is the vocal tract length, is the speed of sound waves propagating in the fluid, is the average axial velocity of the fluid, is the vocal tract angle; Two formulas can be used to express the fluid flow rate: ; Multiply by the flow area A to get the volume flow rate ,like: ; A manual valve is fixedly provided at the input end of the intelligent safety valve. The manual valve and the intelligent safety valve are connected through a gas pipeline. The manual valve and the intelligent safety valve jointly control the on-off status of the gas pipeline to strengthen the control over the gas.

[0022] An air inlet is fixedly provided at the input end of the manual valve, and the air inlet is connected to the municipal gas pipeline network. The air inlet leads the gas from the gas pipeline to the manual valve.

[0023] A gas stove is fixedly arranged at the output end of the ultrasonic gas meter. The ultrasonic gas meter is connected to the gas stove through a gas pipeline and is used to measure the amount of gas used by the gas stove.

[0024] The NB-IoT data collected by the smart safety valve is uploaded to the cloud platform.

[0025] The cloud platform is connected to the leakage monitoring platform, gas company terminal, property company terminal and mobile APP. The leakage monitoring platform is used to timely detect and deal with gas leakage safety hazards, and the property company terminal checks the leakage point and evacuates the crowd.

[0026] After receiving the gas leak information, the gas company terminal stops the gas delivery to avoid more gas leaks and prevent the leakage accident from further expanding. The mobile phone APP is used to remind users of the occurrence of gas leak accidents and make early preparations for response.

[0027] The ultrasonic intelligent safety gas meter is not only a fully electronic metering instrument with high reliability, high precision and temperature and pressure compensation, but also can realize gas leakage safety management. The ultrasonic intelligent safety gas meter uses safety modules, flow channels and pressure sensing as core detection components, combined with intelligent technologies such as the Internet of Things (4G / NB-IOT), AI learning and big data edge algorithms. While realizing accurate metering of user gas consumption, it monitors user gas safety in real time, promptly discovers user leakage safety hazards, and performs abnormal reporting and automatic valve control.

[0028] Accurately and quickly carry out warning of gas anomalies, timely discover hidden gas hazards at the user end and eliminate them in advance to prevent gas accidents from happening, control accidents caused by gas leakage in the user-end pipeline system to "zero", and improve inherent safety.

[0029] Features of ultrasonic gas meter: Digital design, complete functions, intuitive display; accurately measure the one-way flow of gas under medium and low pressure conditions, with a wide measurement range, large range ratio, and small starting flow; adopt the principle of ultrasonic propagation time difference method to directly measure the flow rate of gas, and the measurement accuracy is not affected by the change of medium components; high measurement accuracy and good repeatability; no obstructive mechanical parts, not easy to corrode, and minimal pressure loss; compared with diaphragm gas meters, it is small in size and light in weight, without the requirement of front and rear straight pipe sections, and can adapt to various installation positions; for the background prepaid mode, in the state of not opening an account, the user is allowed to overdraw a certain amount of gas, and the valve will be automatically closed when the overdraft set value before opening an account is reached. The user must open an account on the system and recharge and settle before pressing the button to open the valve; if the user does not use gas for many consecutive days, the controller will automatically close the valve for protection. When the user uses gas, press the button to open the valve; if the communication with the background system fails for many consecutive days, the controller will automatically close the valve. The valve cannot be opened by pressing the button. The data must be successfully uploaded again and the valve control release command must be sent to open the valve. After the report is successful, press the button to open the valve; Internet of Things functions: timed reporting, abnormal reporting, button reporting, remote valve switching, remote recharge, balance synchronization, remote parameter setting and reading, remote reading of gas usage details, etc.; 3 settlement modes are supported: prepaid amount mode, background pre-settlement mode and background settlement mode.

[0030] The main functions of ultrasonic gas meter: It supports 3 settlement modes: prepaid amount mode, background pre-settlement mode and background settlement mode; when the battery voltage is low or the balance is low, an alarm will sound every time a certain amount of gas is used; the valve will be closed for protection in case of over-flow or small flow (when the gas equipment is not enabled); if the user does not use gas for several consecutive days, the gas meter will automatically close the valve for protection. When the user uses gas, press the button to open the valve; if communication with the background system fails for several consecutive days, the gas meter will automatically close the valve; it has large data storage capabilities and can save the cumulative gas consumption by year, month, day and hour; Internet of Things function: through the Internet of Things interface, it can easily realize remote meter reading, recharge, balance synchronization, valve control, price adjustment, parameter setting, monitoring, alarm, historical record and other functions; information query function: through the infrared interface or the Internet of Things, you can not only read the gas usage statistics in the gas meter; you can also view alarm information records, recharge records, price adjustment records and other information; remote upgrade function, through the Internet The network can upgrade the program functions of on-site gas meters; alarm for abnormal pressure (ultra-high pressure or ultra-low pressure) and automatically cut off the gas source in an emergency; alarm and close the valve when the flow rate exceeds the normal range of the gas equipment; judge that a leak has occurred when the gas is used for an abnormal period of time, close the valve and alarm; automatically conduct gas leakage safety inspection in the pipeline system after the valve is closed at a fixed time; alarm for ultra-high temperature and automatically cut off the gas source in an emergency; delay valve closing after the user has used gas for a period of time (the time can be set); close the valve and alarm when water or air enters the gas meter through sound velocity detection; close the valve and alarm when external force vibration or abnormal meter disassembly occurs.

[0031] Advantages of safe ultrasonic gas meter: As a metering instrument, it has high measurement accuracy, small starting flow and good repeatability; there are no flow-blocking mechanical parts and the pressure loss is extremely small; temperature and pressure compensation: it has real-time temperature and pressure compensation function to ensure more accurate metering results, reduce the production and sales gap at the gas company's terminal, and improve the company's economic benefits; accuracy and convenience: combined with the intelligent algorithm of Japan's Panasonic safety solution, it is different from the safety solutions of other manufacturers, which ensures the accuracy of user-side leakage judgment, avoids misjudgment, and improves the convenience of operation; real-time remote operation: real-time monitoring of the operating status of the ultrasonic safety gas meter, and remote valve closing anytime and anywhere; intelligent leak detection: users can conduct independent micro-leak detection every day, promptly discover safety hazards of indoor pipeline leakage, enhance safety awareness, and ensure gas safety.

[0032] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A safe ultrasonic gas meter, characterized in that: include: An ultrasonic gas meter, which connects the user to a gas company terminal via a gas pipeline and is used to measure the gas flow rate flowing through the ultrasonic gas meter; An intelligent safety valve, which is connected to an ultrasonic gas meter through a gas pipeline. The intelligent safety valve is fixedly arranged at the input end of the ultrasonic gas meter. The intelligent safety valve is used to control the on-off status of the gas in the gas pipeline. When the intelligent safety valve is opened, gas flows in the gas pipeline. When the intelligent safety valve is closed, gas stops flowing in the gas pipeline. The intelligent switch is wirelessly connected to the intelligent safety valve to control the opening and closing state of the intelligent safety valve. The intelligent switch is wirelessly connected to the ultrasonic gas meter to control the opening and closing state of the ultrasonic gas meter.

2. The safety ultrasonic gas meter according to claim 1, characterized in that: The input end of the intelligent safety valve is fixedly provided with a first pressure difference sensor, and the first pressure difference sensor is used to detect leakage of the gas pipeline at the front section of the house.

3. The safety ultrasonic gas meter according to claim 1, characterized in that: The output end of the intelligent safety valve is fixedly provided with a second pressure difference sensor, and the second pressure difference sensor is used to detect leakage of the user's indoor gas pipeline.

4. The safety ultrasonic gas meter according to claim 1, characterized in that: The working principle of the ultrasonic gas meter is as follows: the time difference of ultrasonic wave in the downstream and upstream directions in the gas medium is proportional to the average flow velocity of the gas. The gas flow velocity is calculated by calculating the relationship between the ultrasonic wave propagation time difference and the propagation distance. The gas flow rate can be obtained by multiplying the flow velocity by the cross-sectional area of ​​the sound channel in the gas meter pipeline. The relationship between the ultrasonic wave downstream and upstream propagation time and each quantity is as follows: ； ； Where: is the time for the ultrasonic wave to propagate in the fluid in the opposite direction. is the time it takes for the ultrasonic wave to propagate downstream in the fluid, is the vocal tract length, is the speed of sound waves propagating in the fluid, is the average axial velocity of the fluid, is the vocal tract angle; Two formulas can be used to express the fluid flow rate: ； Multiply by the flow area A to get the volume flow rate ,like: 。 5. The safety ultrasonic gas meter according to claim 1, characterized in that: A manual valve is fixedly provided at the input end of the intelligent safety valve, and the manual valve is connected to the intelligent safety valve through a gas pipeline.

6. The safety ultrasonic gas meter according to claim 5, characterized in that: An air inlet is fixedly provided at the input end of the manual valve, and the air inlet guides the gas from the gas pipeline to the manual valve.

7. The safety ultrasonic gas meter according to claim 1, characterized in that: A gas stove is fixedly arranged at the output end of the ultrasonic gas meter, and the ultrasonic gas meter is connected to the gas stove through a gas pipeline.

8. The safety ultrasonic gas meter according to claim 1, characterized in that: The NB-IoT data collected by the smart safety valve is uploaded to the cloud platform.

9. The safety ultrasonic gas meter according to claim 8, characterized in that: The cloud platform is connected to a leakage monitoring platform, a gas company terminal, a property company terminal and a mobile phone APP. The leakage monitoring platform is used to timely discover and deal with gas leakage safety hazards, and the property company terminal checks the leakage point and evacuates the crowd.

10. The safety ultrasonic gas meter according to claim 9, characterized in that: The gas company terminal stops the delivery of gas after receiving the gas leakage information, and the mobile phone APP is used to remind the user of the occurrence of the gas leakage accident.

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