Thermal differential pressure flow sensor
A flow sensor and sensing technology, which is applied in the field of sensing and measurement, can solve the problems of inability to measure small pressure difference changes, the application of differential pressure sensors in application scenarios, and the high measurement range of pressure chips.
Pending Publication Date: 2021-04-30
GUANGZHOU AOSONG ELECTRONIC CO LTD
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Problems solved by technology
However, since the measurement range of the pressure chip is usually too high, it is impossible to measure small changes in pressure difference
Moreover, the fluctuation of differential pressure sensors is usually large, and the fluctuation interference is larger than the sensor signal when measuring small pressure differences, so that ordinary differential pressure sensors cannot be applied to the application scenarios of small pressure differences
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[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are examples, and are only for explaining the present invention and should not be construed as limiting the present invention.
[0037] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements and / or components, but does not preclude the pres...
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The invention provides a thermal differential pressure flow sensor. The thermal differential pressure flow sensor comprises a shell, a sensing integrated assembly and a laminar flow element; an air guide channel is arranged in the shell, the two ends of the air guide channel are correspondingly communicated with an air inlet channel and an air outlet channel respectively, and the other end of the air inlet channel is communicated with a pipeline used for conveying air so as to guide airflow circulating in the pipeline into the air guide channel. The other end of the air outlet channel is communicated with the pipeline so as to exhaust air in the air guide channel to the pipeline; the laminar flow element is arranged in the pipeline and used for changing the flow direction of part of gas on the gas circulation path of the pipeline and guiding the part of gas into the gas inlet channel. The sensing integrated assembly is arranged in the air guide channel and comprises two thermistors which are sequentially arranged along the circulation path of the air guide channel and used for detecting the temperature of air, and the sensing integrated assembly converts the temperature difference between the two thermistors into air pressure information and outputs the air pressure information. The thermal differential pressure flow sensor introduces and feeds back gas from the pipeline through the gas guide channel, the gas inlet channel and the gas outlet channel so that the sensing integrated assembly detects the gas pressure of the pipeline.
Description
technical field [0001] The invention belongs to the technical field of sensor measurement, and in particular relates to a thermal differential pressure flow sensor. Background technique [0002] With the rapid development of sensing technology, accurate detection of pipeline airflow is an indicator of gas transmission technology. At present, most of the differential pressure sensors are used to detect the air flow in the pipeline to realize the detection of the air flow in the pipeline. However, the existing differential pressure sensor mainly collects the pressure data at both ends through two pressure chips, processes the collected data through the processing chip, and converts the output gas flow or pressure information. However, since the measurement range of the pressure chip is usually too high, it is impossible to measure small changes in pressure difference. Moreover, the fluctuation of the differential pressure sensor is usually large, and the fluctuation interfer...
Claims
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Login to View More IPC IPC(8): G01F1/34G01F1/69
CPCG01F1/34G01F1/69
Inventor 张宾马鹏飞邱国财刘光亮郭林林曾伟东李国宁许文吉奉贞丽陈维孝陈新准刘新雅张运龙何伟生郑晓银傅王勇黄达荣
Owner GUANGZHOU AOSONG ELECTRONIC CO LTD