A gas total pressure dynamic pressure static pressure measuring device
Patent Information
- Application Number
- CN202522638545.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-12
- Publication Date
- 2026-10-23
- Estimated Expiration
- 2035-12-12
AI Technical Summary
[0004]然而，多传感器测量方案存在明显缺陷：一是硬件成本高；二是安装空间需求大，多个传感器的布置需要预留足够的安装位置，在小型设备、紧凑流道等场景中难以适用；三是维护难度高，多个传感器的校准、检修均需独立进行，增加了后期运维的工作量与时间成本
[0008]与现有技术相比，本实用新型仅采用一个压力传感器，通过时序切换的方式分时段测量气体全压、动压与静压，实现硬件简化、成本降低、数据一致性提升的目标。
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Figure CN224888145U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of flue gas duct measurement technology, and in particular to a gas total pressure dynamic pressure static pressure measuring device. Background Technology
[0002] In some industries, factory exhaust systems often have numerous branches in parallel pipelines. To ensure that each piece of equipment can achieve the required exhaust volume, valve regulation of the pipeline network is necessary. However, this regulation requires knowing the gas pressure or flow rate.
[0003] Measuring total pressure, dynamic pressure, and static pressure of a gas is crucial for evaluating fluid motion and equipment performance. Traditional measurement methods typically require separate total pressure, dynamic pressure, and static pressure sensors, using multiple sensors to simultaneously acquire data and obtain pressure parameters.
[0004] However, multi-sensor measurement solutions have obvious drawbacks: first, high hardware costs; second, large installation space requirements, as the arrangement of multiple sensors requires sufficient installation space, making them unsuitable for scenarios such as small equipment and compact flow channels; and third, high maintenance difficulty, as the calibration and repair of multiple sensors must be carried out independently, increasing the workload and time cost of later operation and maintenance.
[0005] To address the aforementioned issues, there is an urgent need in this field for a method that can simplify hardware structure, reduce costs, and achieve accurate measurement of multiple pressure parameters using a single sensor. Summary of the Invention
[0006] The technical problem to be solved by this utility model is to provide a gas total pressure, dynamic pressure and static pressure measuring device that can measure gas total pressure, dynamic pressure and static pressure in different time periods, so as to achieve the goals of hardware simplification, cost reduction and data consistency improvement.
[0007] To solve the technical problem of this utility model, the solution adopted by this utility model is as follows: a gas total pressure dynamic pressure static pressure measuring device, including a pressure sensor, a Pitot tube, an electromagnetic switching valve one, an electromagnetic switching valve two, and a microcontroller. The Pitot tube is installed on the flue gas duct. The first air inlets of electromagnetic switching valve one and electromagnetic switching valve two are respectively connected to the A-side pipe and B-side pipe outside the Pitot tube. Electromagnetic switching valve one and electromagnetic switching valve two are connected to the pressure sensor, which is an anemometer. The pressure sensor, electromagnetic switching valve one, and electromagnetic switching valve two are connected to the microcontroller. Electromagnetic switching valve one and electromagnetic switching valve two are two-position three-way electromagnetic valves, that is, the air outlets of electromagnetic switching valve one and electromagnetic switching valve two are both connected to the H-end and L-end of the anemometer. The second air inlets of electromagnetic switching valve one and electromagnetic switching valve two are both connected to the outside. The A-side pipe faces the airflow direction of the flue gas duct, and the B-side pipe faces away from the airflow direction of the flue gas duct.
[0008] Compared with existing technologies, this invention uses only one pressure sensor to measure the total pressure, dynamic pressure and static pressure of gas in different time periods by switching between time intervals, thereby achieving the goals of hardware simplification, cost reduction and improved data consistency. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of the connection structure for total pressure measurement; Figure 2 This is a schematic diagram of the connection structure for hydrodynamic measurement; Figure 3 This is a schematic diagram of the connection structure for static pressure measurement. Detailed Implementation
[0010] Example 1: As Figure 1-3 As shown, a gas total pressure, dynamic pressure, and static pressure measuring device includes a pressure sensor 1, a Pitot tube 2, a first electromagnetic switching valve 4, a second electromagnetic switching valve 3, and a microcontroller 5. The Pitot tube 1 is installed on a flue gas duct 6, with its A-side pipe facing the airflow direction of the flue gas duct and its B-side pipe facing away from the airflow direction of the flue gas duct 6. The first air inlets of the first electromagnetic switching valve 4 and the second electromagnetic switching valve 3 are respectively connected to the A-side pipe and the B-side pipe outside the Pitot tube 1. The first electromagnetic switching valve 4 and the second electromagnetic switching valve 3 are connected to the pressure sensor 1, which is an anemometer. The pressure sensor 1, the first electromagnetic switching valve 4, and the second electromagnetic switching valve 3 are connected to the microcontroller 5. The first electromagnetic switching valve 4 and the second electromagnetic switching valve 3 are two-position three-way electromagnetic valves, that is, the air outlets of the first electromagnetic switching valve 4 and the second electromagnetic switching valve 3 are both connected to the H and L ends of the anemometer, and the second air inlets of the first electromagnetic switching valve 4 and the second electromagnetic switching valve 3 are both connected to the outside atmosphere.
[0011] The controller is used to control the timing of the switching valve and collect sensor data. According to the requirements, the connection position of the switching valve is controlled by the program.
[0012] This invention uses only one pressure sensor to measure the total pressure, dynamic pressure and static pressure of gas in different time periods by switching between time intervals, thereby achieving the goals of hardware simplification, cost reduction and improved data consistency.
[0013] Example 2: A method for measuring the total pressure, dynamic pressure, and static pressure of a gas, comprising the following steps: Before measurement, a timing switching measurement device is set up, which includes: one high-precision pressure sensor 1 (i.e., wind speed transmitter, with a range adapted to the pressure range of the gas to be measured, and an accuracy ≤0.1% FS), two electromagnetic switching valves (i.e., electromagnetic switching valve 4 and electromagnetic switching valve 3, respectively corresponding to the A and B end collection channels of the Pitot tube 1 in the attached figure), one microcontroller 5, one data storage module (for storing measurement data), and one set of gas acquisition pipeline (including gas measurement tubes, which are respectively arranged at the corresponding positions of the gas to be measured: the opening of the total pressure tube faces the airflow direction, and the opening of the static pressure tube is perpendicular to or away from the airflow direction). The signal input terminal of the pressure sensor is connected to the output terminals of two solenoid switching valves via pipelines. The input terminals of the two solenoid switching valves are connected to terminals A and B of the Pitot tube via pipelines. The control output terminal of the microcontroller is connected to the control terminals of the two solenoid switching valves and the acquisition control terminal of the pressure sensor. The signal input terminal of the microcontroller is connected to the signal output terminal of the pressure sensor. The microcontroller has a bidirectional communication connection with the data storage module.
[0014] During dynamic pressure measurement, such as Figure 1 As shown, the gas passes through the A-side pipe of the Pitot tube, connects to the first solenoid switching valve, and then connects to the H-end of the air pressure transmitter; simultaneously, the gas passes through the B-side pipe of the Pitot tube, connects to the second solenoid switching valve, and then connects to the L-end of the air pressure transmitter. When measuring total pressure, such as Figure 2 As shown, the gas passes through the A-side pipe of the Pitot tube, connects to the first electromagnetic switching valve, and then connects to the H end of the air pressure transmitter; at the same time, the L end of the air pressure transmitter is connected to the second electromagnetic switching valve, which switches to be connected to the outside atmosphere. At this time, the gas in the B-side pipe of the Pitot tube is isolated and is not connected to the air pressure transmitter. When measuring static pressure, such as Figure 3 As shown, the gas passes through the B-side pipe of the Pitot tube, connects to the second electromagnetic switching valve, and then connects to the L-end of the air pressure transmitter; at the same time, the H-end of the air pressure transmitter is connected to the first electromagnetic switching valve, which switches to be connected to the atmosphere. At this time, the gas in the A-side pipe of the Pitot tube is isolated and not connected to the air pressure transmitter.
[0015] The timing switching cycle and the measurement duration of each pressure parameter are set via a microcontroller: The timing switching cycle T is set according to the requirements of the process conditions and the stability of the gas flow field to be measured. The flow field measurement cycle T includes the following total pressure measurement duration t1, dynamic pressure measurement duration t2 and static pressure measurement duration t3, and the interval t0 when switching between each pressure; t1, t2 and t3 are all 1~60min. Total pressure measurement duration t1: The conduction time of the total pressure acquisition channel within each cycle. t1 ≥ the response time of the pressure sensor to ensure stable sensor output. Dynamic pressure measurement duration t2: The conduction time of the dynamic pressure acquisition channel within each cycle; Static pressure measurement duration t3: The conduction time of the static pressure acquisition channel within each cycle; Switching interval t0: The interval between two adjacent pressure acquisitions. t0 is set to 0.05-0.1s to avoid measurement errors caused by switching.
[0016] The microcontroller controls the electromagnetic switching valve to open and close according to the set timing parameters, so that the pressure sensor collects total pressure, dynamic pressure, and static pressure data in time intervals. The specific measurement process of total pressure, dynamic pressure, and static pressure is as follows: Phase 1: Total Pressure Measurement The microcontroller controls the pressure sensor to start collecting data. The collection time is t1. The collected total pressure data is transmitted to the microcontroller and stored in the data storage module. Phase 2: Dynamic Pressure Measurement The control pressure sensor collects data for a duration of t2. The collected dynamic pressure data is then transmitted to the microcontroller and stored. Phase 3: Static Pressure Measurement The control pressure sensor collects data for a duration of t3. The collected static pressure data is then transmitted to the microcontroller and stored. Cyclic execution: After completing one measurement of total pressure, dynamic pressure, and static pressure, the microcontroller controls the electromagnetic switching valve one and electromagnetic switching valve two to close, and after waiting for a duration of (T - t1 - t2 - t3 - 4t0), the process of stages 1 to 3 above is repeated to achieve continuous time-sequence switching measurement.
[0017] Furthermore, the measurement method of the above-mentioned gas total pressure, dynamic pressure, and static pressure measuring device also includes data processing and output: the microcontroller performs data filtering and data correlation processing on the acquired total pressure data P_total, dynamic pressure data P_dynamic, and static pressure data P_static. Data filtering employs a moving average filtering algorithm to remove random interference from single measurements. Data association marks P_total, P_dynamic, and P_static collected within the same time period as a group of associated data to ensure that the data correspond to the same flow field state; Data output: The processed pressure data is output in real time to the local LCD screen for display, or sent to the host computer, or stored in the data storage module for later retrieval via the microcontroller's communication interface (such as RS485, USB, RS232).
Claims
1. A gas total pressure, dynamic pressure, and static pressure measuring device, characterized in that, The system includes a pressure sensor, a Pitot tube, a first electromagnetic switching valve, a second electromagnetic switching valve, and a microcontroller. The Pitot tube is installed on the flue gas duct. The first air inlets of the first and second electromagnetic switching valves are connected to the A-side pipe and B-side pipe outside the Pitot tube, respectively. The first and second electromagnetic switching valves are connected to the pressure sensor, which is an anemometer. The pressure sensor, the first and second electromagnetic switching valves are connected to the microcontroller. The first and second electromagnetic switching valves are two-position three-way solenoid valves, meaning that the air outlets of both the first and second electromagnetic switching valves are connected to the H and L ends of the anemometer. The second air inlets of both the first and second electromagnetic switching valves are connected to the outside. The A-side pipe faces the airflow direction of the flue gas duct, and the B-side pipe faces away from the airflow direction of the flue gas duct.