Method for obtaining liquid medicine in fixed amount

An acquisition method and technology for liquid medicine, applied in the chemical and medical fields, can solve the problems of great influence, high price, fluctuation of liquid level, etc., and achieve the effect of improving precision and easy operation.

Inactive Publication Date: 2009-06-03
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current common method of liquid medicine quantitative acquisition, the error is multiplied by the bottom area of ​​the storage container. In some more sophisticated systems, it obviously cannot meet the requirements, and a higher-precision liquid level sensor needs to be customized, and the price very expensive
In addition, there may be vibrations in the storage container, which causes fluctuations in the liquid level, so that the error of the measured liquid level is even greater
The non-contact liquid level sensor has slightly better accuracy than the contact liquid level sensor, but most high-concentration and highly corrosive liquids are prone to "atomization", such as the acid formed above high-concentration hydrochloric acid and nitric acid. Fog, which interferes with it and makes measurements inaccurate
If a high-precision metering pump is used to obtain a high-strength corrosive liquid, although the accuracy can reach 0.1%, or even 0.05%, the temperature, viscosity, and particle condition of the medium liquid have a great influence on the high-precision metering pump, and the high-precision metering pump Expensive and short-lived

Method used

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  • Method for obtaining liquid medicine in fixed amount
  • Method for obtaining liquid medicine in fixed amount
  • Method for obtaining liquid medicine in fixed amount

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1 implements the quantitative addition of 800 milliliters of 45% caustic soda solution with the method of the present invention

[0029] Such as figure 1 — image 3 As shown, the vertical distance between the inner bottom surface of the constant-section liquid medicine storage container and the liquid outlet nozzle is 25 cm, and the inner diameter of the liquid outlet conduit is Φ15 mm. The present embodiment utilizes Siemens programmable controller CPU313C and liquid level sensor UTB 2235 (range 500mm precision ± 5mm) carried in the chemical process control system to realize the quantitative addition of 800 milliliters of 45% caustic soda solution by the inventive method, its method Proceed as follows:

[0030] The first step: fitting out 45% caustic soda solution by experiment figure 1 The discharge characteristic equation for the discharge in the storage container of the indicated size

[0031] (1) Measure the density of the liquid to be obtained ρ=1.4...

Embodiment 2

[0057] Example 2 Quantitatively obtain 800 ml of 45% caustic soda solution using existing common methods

[0058] Present embodiment is to quantitatively obtain 800 milliliters of 45% caustic soda solution with existing common method, can be used as a comparative example of the method of the present invention, still utilizes figure 1 The difference of the device shown is that this method directly tests the current liquid level height H through the liquid level sensor, and calculates the target liquid level height H-V / S according to the liquid liquid volume V to control the opening and closing of the solenoid valve. The quantitative acquisition is completed, and the quantitative acquisition of the caustic soda solution is also carried out three times below.

[0059] ①The first quantitative acquisition: the read liquid level height is 47.8cm, the error is ±0.5cm, the target liquid level height H-V / S=45.8cm is calculated from the required liquid volume of 800mL, the solenoid valv...

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Abstract

A method for obtaining liquid medicine in fixed amount belongs to the technical field of chemical engineering and medical treatment, and particularly relates to a method for obtaining liquid medicine in fixed amount. The method provided by the invention is characterized in that a control system provided with a control unit is adopted; by testing the experimental data released by a plurality of groups of liquid to be obtained in a storage container, a cubic curve of the valve opening and discharging time required by a random amount of liquid medicine at a certain liquid level is proposed; a binary function describing a random amount liquid medicine discharged from a random liquid level is derived therefrom; time required for the addition of a certain amount of liquid medicine at the current liquid level can be computed through the function; and the time determines when to open the valve, so that accurate acquisition of the liquid medicine can be fulfilled. The method provided by the invention greatly reduces the effect of the accuracy of a liquid level sensor on the results, is free of sophisticated hardware, and has the advantages of high accuracy, long service life and good economy when being embedded in a control system. The invention can be widely applied to liquid medicine filling, acquisition of a fixed amount of liquid medicine and accurate proportion of various liquid medicines, and particularly exhibits obvious advantages when dealing with highly corrosive liquid medicine.

Description

technical field [0001] The invention belongs to the technical fields of chemical industry and medical treatment, and in particular relates to a method for quantitatively obtaining medicinal liquid. Background technique [0002] In the chemical and medical fields, it often involves the filling of liquid medicine, the acquisition of a certain amount of liquid medicine, and the precise proportioning of various liquid medicines. At present, the general method of quantitatively obtaining the liquid medicine is to take out the liquid medicine in a certain way from a storage container with a constant cross-section, and use a liquid level sensor to detect the height of the liquid level in the container. The product is obtained to obtain the volume of the medicinal solution. There are two types of liquid level sensors: contact type and non-contact type. Among them, the contact type includes float type, static pressure type, etc., and the non-contact type mainly includes ultrasonic l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D7/06
Inventor 王时龙周杰康玲李永兵何云静姚威
Owner CHONGQING UNIV
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