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Liquid micro-flow detection method

A detection method and micro-flow technology, applied in the direction of detecting fluid flow by measuring differential pressure, volume/mass flow generated by mechanical effects, etc., can solve the problem that the measurement accuracy cannot be guaranteed, and achieve convenient and simple implementation and meet the system accuracy. desired effect

Inactive Publication Date: 2013-06-12
THE FIRST AFFILIATED HOSPITAL OF SUN YAT SEN UNIV +1
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Problems solved by technology

Measurement accuracy cannot be guaranteed when the signal is too weak

Method used

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Embodiment Construction

[0020] In order to better explain the present invention, the present invention will be further described below in conjunction with the accompanying drawings.

[0021] figure 1 is an application of the present invention, such as figure 1 As shown, it mainly includes a liquid storage bottle 1, a solenoid valve 2, a glass tee pipe 3, a pressure sensor 4 and a microprocessor 5, the liquid storage bottle 1 is used to store the required extraction liquid, and the pressure sensor 4 is installed in the liquid storage The vicinity of the liquid outlet of the bottle 1 is slightly lower than the position of the liquid outlet, and the electromagnetic valve 2 is installed at the liquid outlet, and controls whether to allow the above-mentioned extract to flow out of the liquid storage bottle 1 under the control of the microprocessor 5 . One end of the glass three-way pipe 3 is connected to the output end of the solenoid valve 2, and one end is output to the container, and the third end is ...

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Abstract

A liquid micro-flow detection method comprises the following steps: S1, obtaining a function relation V(P) between pressure P and velocity V of liquid at liquid outlet of a storage container; S1.1, sampling the pressures of the liquid at the liquid outlet at different liquid levels, measuring the accumulated flow M1 of the liquid in a time period T when sampling is carried out under all pressure values, so as to calculate the liquid velocity V, M1 / T, under the corresponding sampling pressure value and build a data set of pressure-velocity of sampling liquid of each time; S1.2, based on the pressure-flow velocity data set obtained in the S1, assuming the order of an approximating function, and calculating the coefficient of the approximating function corresponding to the order through a least squares method, so as to obtain the function relation V (P) between the pressure and velocity of the liquid; and S2, integrating the function relation V(P) to calculate the flow M in a certain period. According to the invention, with the function relation between the pressure and velocity of the liquid at the liquid outlet, the overall flow in a certain time can be monitored as long as the pressure of the liquid outlet is monitored, and the method can be used for the measurement of the liquid with the velocity below 800 L / h.

Description

technical field [0001] The invention belongs to the technical field of liquid flow measurement, and in particular relates to a method for detecting micro-flow liquid flow. Background technique [0002] At present, most of the flowmeters available on the market are rotameters or turbine flowmeters, and these flowmeters are only suitable for the measurement of liquid flow with a flow rate above 800L / h. For the measurement of small-flow liquids, that is, liquids with a flow rate below 800L / h, it is very difficult to monitor the flow of these liquids because the pipelines of these liquids are generally thin, the flow rate is slow, and the liquid pressure is low. [0003] Patent No. 96217874.8 is a Chinese utility model patent "liquid flow detection device". Although its specification claims that the invention is a liquid flow detection device that does not require flow velocity, it realizes liquid flow measurement by measuring the pressure difference at both ends of the pump. ,...

Claims

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Application Information

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IPC IPC(8): G01F1/34
Inventor 杨振野肖良宝胡军刘小林姚济明
Owner THE FIRST AFFILIATED HOSPITAL OF SUN YAT SEN UNIV
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