Pneumatic control type accurate measuring device
A metering device and air pressure control technology, which is applied in the field of precise quantitative equipment for micro-liquids, can solve the problems of affecting the pH value of the bottom liquid, change in electrical conductivity, low measurement accuracy, etc., and achieve the effects of compact structure, low cost, and guaranteed electrical conductivity.
Active Publication Date: 2010-08-25
CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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Problems solved by technology
The above method has the following problems: because the volume of the standard liquid added is relatively large, which affects the pH value of the bottom liquid, and changes the conductivity of the system, resulting in low measurement accuracy
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[0013] The present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings.
[0014] As shown in Figure 1, the air pressure control type precise metering device of the present invention includes a metering cavity 1, a liquid storage part 2, a capillary metering liquid outlet pipe 3, a stroke needle 4, a diaphragm 5, an air path diversion assembly 8 and a control assembly 9, The upper and lower ends of the metering chamber 1 are respectively provided with an upper sealing cover 103 and a lower sealing cover 104. The diaphragm 5 separates the interior of the metering chamber 1 into an upper chamber 101 and a lower chamber 102 which are independent. The diaphragm 5 is provided with sealing ring. The liquid storage part 2 is used for storing the liquid to be measured. The liquid storage part 2 is located in the metering chamber 1 and communicates with the liquid inlet of the capillary metering outlet pipe 3, the strok...
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The invention discloses a pneumatic control type accurate measuring device which comprises a measuring chamber, a liquid storage part, a capillary measuring liquid outlet pipe, a stroke needle, a diaphragm, a gas path shunting assembly and a control assembly, wherein the interior of the measuring chamber is divided into an upper chamber and a lower chamber which are respectively independent through the diaphragm; the liquid storage part is positioned in the measuring chamber and is communicated with the liquid inlet of the capillary measuring liquid outlet pipe; the stroke needle is positioned in the lower chamber; the upper end of the stroke needle is connected with the diaphragm and can move along with the diaphragm; the lower end of the stroke needle is matched with the liquid inlet of the capillary measuring liquid outlet pipe to control on-off; the upper chamber is communicated with the gas path shunting assembly through a first air duct; the lower chamber is communicated with the gas path shunting assembly through a second air duct; and the gas path shunting assembly is connected with the control assembly. The pneumatic control type accurate measuring device of the invention has the advantages of simple and compact structure, low cost, high accuracy and good reliability.
Description
technical field [0001] The invention mainly relates to the field of precise quantitative equipment for tiny amounts of liquid, in particular to a pneumatic metering device. Background technique [0002] In the field of environmental protection, it is often necessary to measure the composition of a small amount of liquid, such as the detection of heavy metal content in surface water. The conventional method is to use various quantitative tube valves to measure by adding a relatively large amount of standard liquid; then use the standard recovery algorithm to calculate the concentration of the substance. The above method has the following problems: because the volume of the added standard liquid is relatively large, which affects the pH value of the bottom liquid, and changes the conductivity of the system, resulting in low measurement accuracy. Contents of the invention [0003] The technical problem to be solved by the present invention is: aiming at the technical problem...
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IPC IPC(8): G01F19/00
Inventor 谭自强王强陈辉缪军飞
Owner CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD