Laminar flow differential pressure flowmeter with wet gas flow measurement
Patent Information
- Application Number
- CN202522027393.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-22
- Publication Date
- 2026-09-08
- Estimated Expiration
- 2035-09-22
AI Technical Summary
若未进行湿度补偿，将导致质量和体积流量测量出现偏差
[0008] The beneficial effects of this invention are as follows: By incorporating temperature and humidity sensors into the flow meter body, the temperature and humidity of the transported gas are detected. This data collection allows for temperature and humidity compensation, resulting in more accurate measurements of humid gases. Furthermore, the laminar flow element comprises a primary rectifying layer and a secondary measuring layer. The micron-sized channels of the primary rectifying layer significantly resist the fluid, consuming fluid kinetic energy and reducing high-speed fluid dynamics at the inlet, thus eliminating inlet turbulence. The random vortices caused by turbulence lead to flow pulsations, causing the sensor to acquire unsteady signals. In laminar flow, the velocity distribution is parabolic, allowing the sensor to capture stable fluid characteristic values, reducing the need for filtering in data post-processing. This reduces differential pressure signal fluctuations caused by gas pulsation, resulting in more accurate measurements.
Smart Images
Figure CN224731365U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of laminar flow differential pressure flow meter technology, and in particular to a laminar flow differential pressure flow meter capable of measuring the flow rate of humid gas. Background Technology
[0002] A laminar flow differential pressure flow meter is a differential pressure flow meter composed of a laminar flow sensor and a differential pressure gauge. It measures flow rate by measuring the differential pressure across the sensor. Laminar flow flow meters are generally used to measure minute flow rates and for precision control applications. We usually imagine air as a clean, dry gas mixture, but in reality, air almost always contains water vapor. From chemical production to industrial processes, humidity is always a critical variable. Because the molecular weight and thermodynamic properties of water vapor differ from those of dry gases, its presence alters gas volume, viscosity, and compressibility. Without humidity compensation, deviations in mass and volumetric flow rate measurements will occur. Therefore, we designed a laminar flow differential pressure flow meter capable of measuring the flow rate of humid gases. Utility Model Content
[0003] To overcome the technical defects of the existing technology, this utility model provides a laminar flow differential pressure flow meter with humid gas flow measurement, which collects gas temperature and humidity data and performs temperature and humidity compensation, thereby making the measured data more accurate.
[0004] The technical solution adopted in this utility model is as follows: a laminar flow differential pressure flowmeter with humid gas flow measurement, including a flowmeter body, a circuit board, a signal acquisition board, and a differential pressure sensor. The flowmeter body has a flow channel and an installation cavity communicating with the flow channel. The differential pressure sensor is mounted on the flowmeter body for detecting the differential pressure across a laminar flow element. The installation cavity houses the laminar flow element, and the upper part of the installation cavity has a pad for pressing the laminar flow element, with multiple through holes on the pad. The flowmeter body is located on both sides of the laminar flow element, where the differential pressure sensors are positioned. A top cover is mounted on the top of the flowmeter body at the top of the installation cavity. The signal acquisition board is connected to both the circuit board and the signal acquisition board, and the differential pressure sensor is connected to the acquisition board. A detection cavity is formed between the top cover and the installation cavity, and the top cover has multiple mounting holes. Temperature sensors are installed in the mounting holes and inserted into the detection cavity. A humidity sensor is located at the air inlet of the flowmeter body, and both the temperature and humidity sensors are connected to the signal acquisition board.
[0005] Preferably, the laminar flow element comprises a primary rectifier layer and a secondary measurement layer.
[0006] Preferably, the top cover is fixed with a housing by a positioning frame, and the circuit main board and the signal acquisition main board are both located inside the housing. The side wall of the housing is also provided with a display screen that is connected to the circuit main board and is used to display measurement data.
[0007] The flow meter body is made of stainless steel.
[0008] The beneficial effects of this invention are as follows: By incorporating temperature and humidity sensors into the flow meter body, the temperature and humidity of the transported gas are detected. This data collection allows for temperature and humidity compensation, resulting in more accurate measurements of humid gases. Furthermore, the laminar flow element comprises a primary rectifying layer and a secondary measuring layer. The micron-sized channels of the primary rectifying layer significantly resist the fluid, consuming fluid kinetic energy and reducing high-speed fluid dynamics at the inlet, thus eliminating inlet turbulence. The random vortices caused by turbulence lead to flow pulsations, causing the sensor to acquire unsteady signals. In laminar flow, the velocity distribution is parabolic, allowing the sensor to capture stable fluid characteristic values, reducing the need for filtering in data post-processing. This reduces differential pressure signal fluctuations caused by gas pulsation, resulting in more accurate measurements. Attached Figure Description
[0009] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.
[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0011] Figure 2 This is a partial explosion diagram of the present invention;
[0012] Figure 3 This is a schematic diagram of the structure of the laminar flow element of this utility model;
[0013] Figure 4 This is a schematic diagram of the structure of the laminar flow element of this utility model.
[0014] Explanation of reference numerals in the attached figures: 1. Flow meter body; 2. Flow channel; 3. Mounting cavity; 4. Laminar flow element; 5. Gasket; 6. Through hole; 7. Differential pressure sensor; 8. Top cover; 9. Mounting hole; 10. Temperature sensor; 11. Humidity sensor; 12. Circuit board; 13. Signal acquisition board; 14. First-stage rectifier layer; 15. Second-stage measurement layer; 17. Housing; 18. Display screen; 19. Positioning frame; 20. Signal interface. Detailed Implementation
[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.
[0016] like Figure 1-4 As shown, this embodiment provides a laminar flow differential pressure flowmeter with humid gas flow measurement capabilities, including a flowmeter body 1, a circuit board 12, a signal acquisition board 13, and a differential pressure sensor. The flowmeter body 1 has a flow channel 2 inside, and the flowmeter body 1 has an installation cavity 3 communicating with the flow channel 2. The differential pressure sensor is installed on the flowmeter body 1 and is used to detect the differential pressure on both sides of the laminar flow element. The differential pressure sensor is not shown in the figure. This is a part of existing laminar flow differential pressure flowmeters and is a technology well known to those skilled in the art, so it will not be described in detail here. This utility model introduces temperature and humidity measurement for compensation, thereby making the measurement data obtained when measuring humid gas more accurate. The mounting cavity 3 is equipped with a laminar flow element 4, and the upper part of the mounting cavity 3 is provided with a pad 5 for pressing the laminar flow element 4. The pad 5 is provided with multiple through holes 6. The flow meter body 1 is equipped with a top cover 8 at the top of the mounting cavity 3. The signal acquisition main board 13 is connected to the circuit main board 12 and the signal acquisition main board 13. The differential pressure sensor is connected to the acquisition main board 13. A detection cavity is formed between the top cover 8 and the mounting cavity 3. The top cover 8 is provided with multiple mounting holes 9. Temperature sensors 10 are installed in the mounting holes 9 and inserted into the detection cavity. The air inlet end of the flow meter body 1 is provided with a humidity sensor 11. Both the temperature sensor 10 and the humidity sensor 11 are connected to the signal acquisition main board 13.
[0017] The laminar flow element 4 comprises a primary rectifying layer 14 and a secondary measuring layer 15. The primary rectifying layer 14 is a multi-layered stacked metal laminar flow plate that generates significant resistance to the fluid, consumes fluid kinetic energy, reduces high-speed fluid dynamics at the inlet, and eliminates inlet turbulence. The random vortices induced by turbulence can cause flow pulsations with instantaneous velocity fluctuations of up to ±15%, leading to the sensor acquiring unsteady signals. In laminar flow, the velocity distribution is parabolic, allowing the sensor to capture stable fluid characteristics such as pressure, temperature, and concentration gradients, reducing the need for filtering in data post-processing. This reduces differential pressure signal fluctuations caused by gas pulsation, resulting in more accurate measurements.
[0018] The top cover 8 is fixed with a housing 17 via a positioning bracket 19. The circuit main board 12 and the signal acquisition main board 13 are both located inside the housing 17. The side wall of the housing 17 is also provided with a display screen 18 connected to the circuit main board 12 for displaying measurement data, which facilitates the display of measurement data. The housing is also provided with a signal interface 20 for signal connection with the signal acquisition main board 13.
[0019] The main body of the flow meter 1 is made of stainless steel, which is corrosion resistant.
[0020] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.
[0021] Working Principle: Temperature and humidity sensors are integrated into the flow meter body to detect the temperature and humidity of the transported gas. This data is collected for temperature and humidity compensation, resulting in more accurate measurements of humid gases. The laminar flow element consists of a primary rectifying layer and a secondary measuring layer. The rectifying layer, composed of multi-layered stacked metal laminar flow plates, significantly resists the fluid, dissipates fluid kinetic energy, reduces high-speed fluid dynamics at the inlet, and eliminates inlet turbulence. The random vortices caused by turbulence lead to flow pulsations, causing the sensor to acquire unsteady signals. In laminar flow, the velocity distribution is parabolic, allowing the sensor to capture stable fluid characteristic values, reducing the need for filtering in post-processing. This reduces differential pressure signal fluctuations caused by gas pulsation, resulting in more accurate measurements.
[0022] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.
Claims
1. A laminar flow differential pressure flowmeter with humid gas flow measurement capability, comprising a flowmeter body (1), a circuit board (12), a signal acquisition board (13), and a differential pressure sensor, wherein the flowmeter body (1) has a flow channel (2) and a mounting cavity (3) communicating with the flow channel (2) is provided on the flowmeter body (1), the differential pressure sensor is disposed on the flowmeter body (1) for detecting the differential pressure on both sides of the laminar flow element, and a laminar flow element (4) is installed in the mounting cavity (3), characterized in that: The upper part of the mounting cavity (3) is provided with a pad (5) for pressing the laminar flow element (4), and the pad (5) is provided with multiple through holes (6). The flow meter body (1) is located on both sides of the laminar flow element with differential pressure sensors. The flow meter body (1) is provided with a top cover (8) at the top of the mounting cavity (3). The signal acquisition main board (13) is connected to the circuit main board (12) and the signal acquisition main board (13). The differential pressure sensor is connected to the acquisition main board (13). A detection cavity is formed between the top cover (8) and the mounting cavity (3). The top cover (8) is provided with multiple mounting holes (9). The mounting holes (9) are provided with temperature sensors (10) inserted into the detection cavity. The air inlet end of the flow meter body (1) is provided with a humidity sensor (11). The temperature sensor (10) and the humidity sensor (11) are both connected to the signal acquisition main board (13).
2. The laminar flow differential pressure flowmeter with humid gas flow measurement capability according to claim 1, characterized in that: The laminar flow element (4) consists of a primary rectifier layer (14) and a secondary measurement layer (15).
3. A laminar flow differential pressure flowmeter with humid gas flow measurement capability according to claim 1, characterized in that: The top cover (8) is fixed with a housing (17) by a positioning frame (19), and the circuit main board (12) and the signal acquisition main board (13) are both located inside the housing (17).
4. A laminar flow differential pressure flowmeter with humid gas flow measurement capability according to claim 3, characterized in that: The side wall of the housing (17) is also provided with a display screen (18) that is connected to the circuit board (12) and is used to display measurement data.
5. A laminar differential pressure flowmeter with humid gas flow measurement capability according to claim 4, characterized in that: The flow meter body (1) is made of stainless steel.