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Method and device for precisely measuring volume of volume metering pipe

A technology of volumetric measurement and measuring device, which is applied in the direction of volumetric measuring instrument/method, measuring device, liquid/fluid solid measurement, etc. It can solve the problems of high software and hardware requirements, poor precision and accuracy, and small application range, and achieve test Accurate results, exclusion of air bubbles and dirt, and a wide range of options

Inactive Publication Date: 2014-11-05
SHENZHEN DYMIND BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a high-precision measuring method and device for the volume of a volumetric measuring tube, aiming to solve the problems of poor precision and accuracy, small application range and high requirements for software and hardware in the prior art

Method used

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  • Method and device for precisely measuring volume of volume metering pipe
  • Method and device for precisely measuring volume of volume metering pipe
  • Method and device for precisely measuring volume of volume metering pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Such as figure 1 As shown, the device provided in Embodiment 1 uses the stepper motor 1 to convert the rotational motion of the motor rotor into linear motion through the lead screw. The lead screw is rigidly connected with the piston of the syringe 4, so that the piston of the syringe also moves axially in a straight line to absorb or discharge liquid. The stepper motor (with lead screw) and the mechanical structural parts of the syringe machine form the syringe assembly. The injector assembly is equipped with an optocoupler 2 at the initial position of the motor. The initial motor is rigidly connected with the optocoupler and the structure of the injector assembly. The motor is initialized by finding the optocoupler. The initialized motor and syringe can participate in the test at any time.

[0049] The outlet of the syringe 4 is connected to the common port COM of the second solenoid valve 6 . The normally open end NO of the second solenoid valve 6 is connected to ...

Embodiment 2

[0071] The high-precision measuring device for the volume of the volume metering tube provided in Example 2 is a micro quantitative liquid pump driven by electricity. Because the outlet pressure of the micro quantitative liquid pump is the sum of the local atmospheric pressure, the pressure lost along the pipeline and the pressure lost locally, Very small, high volumetric efficiency, high quantitative accuracy. The trigger deviation of the liquid level detection optocoupler is ±1ms, and the trigger errors of the first liquid level detection optocoupler and the second liquid level detection optocoupler can cancel each other out, so the error caused by the liquid level detection optocoupler is also very small. Integrating the error of the micro quantitative liquid pump, the error of the liquid level detection optocoupler, etc., the error of the entire calibration system is also very small, and the coefficient of variation (CV value) can reach 0.5%, or even smaller, showing that t...

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Abstract

The invention discloses a method and a device for precisely measuring volume of a volume metering pipe. A step motor of the device is in rigid connection with a piston of an injector through a lead screw, the injector is provided with a motor initial-position optocoupler, and an outlet of the injector is connected with a second electromagnetic valve. The second electromagnetic valve is connected with a reagent barrel and one end of a first T-shaped joint, the other end of the first T-shaped joint is connected with the volume metering pipe, a straight-angle end of the first T-shaped joint is connected with an inlet end of a first electromagnetic valve, and an outlet end of the first electromagnetic valve is connected with an air filter; a first liquid-level detection optocoupler and a second liquid-level detection optocoupler are arranged at the top end and the bottom end of the volume metering pipe respectively, the bottom end of the volume metering pipe is connected with a public end of a third electromagnetic valve, the third electromagnetic valve is connected with a second T-shaped joint and connected with a high-level end of a negative-pressure chamber, a low-level end of the negative-pressure chamber is connected with a liquid pump, the liquid pump is connected with the second T-shaped joint, and the second T-shaped joint is connected with a waste liquid barrel. By the method and the device for precisely measuring volume, precise and reliable measurement can be realized.

Description

technical field [0001] The invention relates to a method and device for calibrating the volume of a fluid container, in particular to a method and device for measuring the volume of a volume measuring tube with high precision. Background technique [0002] Accurate testing products, especially medical clinical testing equipment, the accuracy of the volume calibration of the quantitative device directly affects the performance of the equipment, which in turn affects the clinical results, such as the overall performance of the medical blood cell analyzer. The volume metering tube is a quantitative metering device, but there is a difference between the theoretical metering volume and the actual metering volume of the product design, so the actual metering volume must be accurately calibrated. [0003] Prior art 1, Chinese patent CN103185619A, first quantitatively inject liquid into the volumetric measuring tube, adjust the position of the stop liquid level detector as required,...

Claims

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Application Information

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IPC IPC(8): G01F17/00
Inventor 许焕樟
Owner SHENZHEN DYMIND BIOTECH
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