Thermal Gas Mass Flow Meter Circuit
The thermal gas mass flow meter circuit addresses complexity, noise resistance, and power consumption issues by integrating modules and using efficient components, resulting in a compact, stable, and accurate flow meter with reduced power consumption.
Patent Information
- Application Number
- JP2025003792U
- Authority / Receiving Office
- JP · JP
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2025-10-31
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-10-31
AI Technical Summary
Conventional thermal gas mass flow meter circuits face issues such as complex structure, low integration, poor noise resistance, and high power consumption, leading to large device sizes and unstable measurement accuracy.
A thermal gas mass flow meter circuit comprising a temperature detection module, signal conditioning module, microcontroller module, display module, communication module, and power supply module, with rational module connections and the use of low-power elements and efficient voltage conversion, to simplify structure, enhance integration, suppress noise, and reduce power consumption.
The circuit achieves a compact, easily installable and maintainable device with stable signal transmission and improved measurement accuracy, meeting diverse industrial requirements with energy savings.
Smart Images
Figure 0003254206000001_ABST
Abstract
Description
[Technical Field]
[0001] The present invention relates to the field of flow measurement technology, and more particularly to a thermal gas mass flow meter circuit. [Background technology]
[0002] Thermal gas mass flow meters determine the mass flow rate of gas by measuring its thermal conductivity characteristics, and are widely used in fields such as industrial process control and energy metering. However, conventional thermal gas mass flow meter circuits have problems such as a complex structure, low integration, poor noise resistance, and high power consumption, which result in large device sizes and unstable measurement accuracy. Summary of the Invention
[0003] This invention relates to a thermal gas mass flow meter circuit proposed to solve the problems of conventional thermal gas mass flow meter circuits, such as complex structure, low integration, insufficient noise resistance, and insufficient measurement accuracy.
[0004] The thermal gas mass flow meter circuit includes a temperature detection module, a signal conditioning module, a microcontroller module, a display module, a communication module, an output module, and a power supply module. The output terminal of the temperature detection module is connected to the input terminal of the signal conditioning module, and the output terminal of the signal conditioning module is connected to the input terminal of the microcontroller module. The output terminal of the microcontroller module is connected to the input terminals of the display module, the communication module, and the output module, respectively. The output terminal of the power supply module is connected to the power supply terminals of the temperature detection module, the signal conditioning module, the microcontroller module, the display module, the communication module, and the output module. The temperature detection module uses a resistance temperature detector to acquire a gas temperature signal, and the signal conditioning module includes an operational amplifier and a filter circuit to amplify and filter the temperature signal.
[0005] By adopting the above technical means, the present application has the following beneficial effects: By rationally dividing and connecting the modules, the circuit structure is simplified, the degree of integration is improved, and the device is made more compact, making installation and maintenance easier. The filter circuit in the signal conditioning module effectively suppresses electromagnetic noise, ensuring stable signal transmission and improving measurement accuracy. The use of low-power elements in each module and highly efficient voltage conversion in the power supply module reduces overall power consumption and achieves energy savings. Equipped with display, communication and multiple output functions, it can meet the diverse requirements of industrial sites and is highly practical. [Brief explanation of the drawings]
[0006] [Figure 1] FIG. 1 is a schematic diagram showing the connection structure of the thermal gas mass flow meter circuit of the present invention. [Figure 2] FIG. 2 is a schematic diagram showing the connection structure of the thermal gas mass flow meter circuit of the present invention. DETAILED DESCRIPTION OF THE INVENTION
[0007] The technical means in the embodiments of the present invention will be described below clearly and completely with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments that can be obtained by those skilled in the art without creative ingenuity fall within the scope of protection of the present invention.
[0008] In practice, the temperature detection module uses a PT100 platinum resistance thermometer, which is in direct contact with the gas being measured. Its resistance changes linearly with changes in gas temperature, indicating the initial temperature state of the gas. The signal conditioning module receives this minute resistance change signal, amplifies it using an internal operational amplifier to a level that can be sampled, and then filters out power frequency components and other high-frequency electromagnetic noise using an RC element filter circuit, outputting a stable, high-purity analog voltage signal to the microcontroller module. As shown in Figure 1, the thermal gas mass flow meter circuit includes a temperature detection module, a signal conditioning module, a microcontroller module, a display module, a communication module, an output module, and a power supply module. The output terminal of the temperature detection module is connected to the input terminal of the signal conditioning module, and the output terminal of the signal conditioning module is connected to the input terminal of the microcontroller module. The output terminal of the microcontroller module is connected to the input terminals of the display module, the communication module, and the output module, respectively. The output terminal of the power supply module is connected to the power supply terminals of the temperature detection module, the signal conditioning module, the microcontroller module, the display module, the communication module, and the output module. The microcontroller (single-chip microcomputer) at the core of the microcontroller module performs high-precision A / D conversion of the received analog voltage signal and calculates the mass flow rate of the gas by performing calculations using a physical formula based on the thermal diffusion principle. The calculated real-time flow rate and temperature data are output from the microcontroller module to the display module, where they are intuitively displayed on an LCD screen. Data is also communicated with a higher-level system using standard protocols such as Modbus RTU via the communications module's RS485 interface circuit. Based on the microcontroller's control commands, the output module converts the flow rate value into an industrial standard 4 to 20 mA analog current signal or a pulse signal proportional to the flow rate, and outputs it for control or recording purposes.
[0009] In this embodiment, the communication module uses an RS485 interface for data communication, and the output module includes a 4-20 mA current output circuit and a pulse output circuit to output a standard flow rate signal. The power supply module converts the external 24V DC power into the operating voltages required within the system. The resistance temperature detector is a PT100, PT20, or PT300 platinum resistance temperature detector, and the microcontroller module uses a single-chip microcomputer for signal processing and flow rate calculation. The display module uses an LCD display to display flow rate information. The filter circuit in the signal conditioning module is configured to effectively suppress electromagnetic noise and ensure stable signal transmission. The power for the entire system is supplied by a power supply module, which efficiently converts the DC 24V power supply commonly used on-site to generate the 5V digital circuit voltage and 3.3V reference voltage required for the system's internal chips, allowing each functional circuit to operate stably and with low power consumption.
Claims
1. 1. A thermal gas mass flow meter circuit, comprising: The device includes a temperature detection module, a signal conditioning module, a microcontroller module, a display module, a communication module, an output module, and a power supply module; The output terminal of the temperature detection module is connected to the input terminal of the signal conditioning module; The output terminal of the signal conditioning module is connected to the input terminal of the microcontroller module; The output terminal of the microcontroller module is connected to the input terminals of the display module, the communication module and the output module, respectively; The output terminal of the power supply module is connected to the power supply terminals of the temperature detection module, the signal conditioning module, the microcontroller module, the display module, the communication module and the output module. A thermal gas mass flow meter circuit comprising:
2. The temperature detection module uses a resistance temperature detector to obtain a gas temperature signal; The signal conditioning module includes an operational amplifier and a filter circuit for amplifying and filtering the temperature signal.
2. The thermal gas mass flow meter circuit according to claim 1,