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,

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

Example Embodiment

[0047] Example 1

[0048] Such as figure 1 As shown, the device provided in this embodiment 1 uses a stepper motor 1 to pass a lead screw to convert the rotary motion of the motor rotor into linear motion. The lead screw and the piston of the syringe 4 are rigidly connected, so that the syringe piston also performs axial linear movement to suck or discharge liquid. The stepping motor (with lead screw) and the mechanical structural parts of the injector machine constitute the injector assembly. The injector assembly is provided with a motor initial position optocoupler 2. The motor is initially rigidly connected to the structure of the injector assembly. The motor is initialized by looking for an optocoupler. The initialized motor and injector can participate in the test at any time.

[0049] The outlet of the syringe 4 is connected to the common end COM of the second solenoid valve 6. The normally open end NO of the second solenoid valve 6 is connected to the reagent tank 3 throu...

Example Embodiment

[0070] Example 2

[0071] The volumetric metering tube volume high-precision test device provided in the second embodiment is a miniature dosing liquid pump driven by electricity, because the outlet pressure of the miniature dosing liquid pump is the sum of the local atmospheric pressure, the pressure lost along the pipeline, and the pressure of the local loss. Very small, high volumetric efficiency, high quantitative accuracy. The trigger deviation of the liquid level detection photocoupler is ±1ms, and the trigger error of the first level detection photocoupler and the second level detection photocoupler can cancel each other, so the error caused by the level detection photocoupler is also very small. Integrating the error of the micro quantitative liquid pump and the optical coupling error of the liquid level detection, 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, which shows that the...

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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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