CN101813504A - Pneumatic control type accurate measuring device - Google Patents

Pneumatic control type accurate measuring device Download PDF

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Publication number
CN101813504A
CN101813504A CN 201010155546 CN201010155546A CN101813504A CN 101813504 A CN101813504 A CN 101813504A CN 201010155546 CN201010155546 CN 201010155546 CN 201010155546 A CN201010155546 A CN 201010155546A CN 101813504 A CN101813504 A CN 101813504A
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communicated
electric valve
gas circuit
solenoid electric
cavity
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CN101813504B (en
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谭自强
王强
陈辉
缪军飞
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Changsha Hasky Environmental Protection Technology Development Co ltd
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Changsha China Huashijie Science & Technology Development Co Ltd
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Abstract

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

Pneumatic control type accurate measuring device
Technical field
The present invention is mainly concerned with small quantity liquid accurate quantification apparatus field, refers in particular to a kind of vapour-pressure type measuring apparatus.
Background technology
In the environmental protection field, often need to measure the composition of small quantity liquid, for example to the detection of content of beary metal in the surface water.Conventional way is, adopts various quantitative pipe valves, by adding the relatively mark-on liquid of volume, measures; Adopt mark-on to reclaim the concentration that algorithm computation goes out material then.There is following problem in said method: because the mark liquid that adds is long-pending bigger, thereby have influence on the ph value of end liquid, the electric conductivity of system is changed, cause measuring accuracy not high.
Summary of the invention
The technical problem to be solved in the present invention just is: at the technical matters that prior art exists, the invention provides a kind of simple and compact for structure, with low cost, precision is high, the Pneumatic control type accurate measuring device of good reliability.
For solving the problems of the technologies described above, the present invention by the following technical solutions.
A kind of Pneumatic control type accurate measuring device, it is characterized in that: comprise the metering cavity, liquid storing part, capillary metering drain pipe, the stroke pin, barrier film, gas circuit shunt assembly and Control Component, the inside that described barrier film will measure cavity is separated into separately independently epicoele and cavity of resorption, described liquid storing part is arranged in the metering cavity and is communicated with the inlet of capillary metering drain pipe, described stroke pin is arranged in cavity of resorption, the upper end of described stroke pin is connected in also can be with diaphragm movement on the barrier film, the lower end of described stroke pin cooperates the control break-make with the inlet of capillary metering drain pipe, described epicoele is communicated with the gas circuit shunt assembly by first wireway, described cavity of resorption is communicated with the gas circuit shunt assembly by second wireway, and described gas circuit shunt assembly links to each other with Control Component.
As a further improvement on the present invention:
Described gas circuit shunt assembly comprises the total solenoid electric valve of gas circuit and first solenoid electric valve, second solenoid electric valve that are connected with the total solenoid electric valve of gas circuit respectively by pipeline, described first solenoid electric valve is communicated with first wireway and finishes the switching that is communicated with outside air or pressure gas source, and described second solenoid electric valve is communicated with second wireway and finishes the switching that is communicated with outside air or pressure gas source.
The total solenoid electric valve of described gas circuit is communicated with pressure gas source by pipeline, and the pipeline between total solenoid electric valve of described gas circuit and the pressure gas source is provided with pressure transducer.
The upper/lower terminal of described metering cavity is respectively equipped with top cover labyrinth and lower sealing cover.
Compared with prior art, advantage of the present invention just is: Pneumatic control type accurate measuring device of the present invention, simple and compact for structure, with low cost, precision is high, good reliability, is applicable to that standard addition method measures the small quantity high concentration stoste of surface water or industrial waste water content of chemical substances and add.Owing to the volume of the stoste that has added high concentration is very little, quantitative accuracy is very high, therefore hardly the ph value is exerted an influence, guaranteed the conductive characteristic of original system, thereby, so just can measure the concentration of water sample very accurately because the polarized wave of concentration change is almost decided by the amount of substance that adds.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Marginal data
1, metering cavity; 101, epicoele; 102, cavity of resorption; 103, top cover labyrinth; 104, lower sealing cover; 2, liquid storing part; 3, capillary metering drain pipe; 4, stroke pin; 5, barrier film; 6, pressure gas source; 7, pressure transducer; 8, gas circuit shunt assembly; 801, the total solenoid electric valve of gas circuit; 802, first solenoid electric valve; 803, second solenoid electric valve; 9, Control Component; 10, first wireway; 11, second wireway.
Embodiment
Below with reference to specific embodiment and Figure of description the present invention is described in further details.
As shown in Figure 1, Pneumatic control type accurate measuring device of the present invention, comprise metering cavity 1, liquid storing part 2, capillary metering drain pipe 3, stroke pin 4, barrier film 5, gas circuit shunt assembly 8 and Control Component 9, the upper/lower terminal of metering cavity 1 is respectively equipped with top cover labyrinth 103 and lower sealing cover 104, the inside that barrier film 5 will measure cavity 1 is separated into separately independently epicoele 101 and cavity of resorption 102, and barrier film 5 is provided with O-ring seal.Liquid storing part 2 is used for storing the liquid that needs metering.Liquid storing part 2 is arranged in metering cavity 1 and is communicated with the inlet of capillary metering drain pipe 3, stroke pin 4 is arranged in cavity of resorption 102, the upper end of stroke pin 4 is connected on the barrier film 5 and can moves with barrier film 5, the lower end of stroke pin 4 cooperates the control break-make with the inlet of capillary metering drain pipe 3, epicoele 101 is communicated with gas circuit shunt assembly 8 by first wireway 10, cavity of resorption 102 is communicated with gas circuit shunt assembly 8 by second wireway 11, and gas circuit shunt assembly 8 links to each other with Control Component 9.
In the present embodiment, gas circuit shunt assembly 8 comprises the total solenoid electric valve 801 of gas circuit and first solenoid electric valve 802, second solenoid electric valve 803 that are connected with the total solenoid electric valve 801 of gas circuit respectively by pipeline, first solenoid electric valve 802 is communicated with first wireway 10 and finishes the switching that is communicated with outside air or pressure gas source 6, and second solenoid electric valve 803 is communicated with second wireway 11 and finishes the switching that is communicated with outside air or pressure gas source 6.The total solenoid electric valve 801 of gas circuit is communicated with pressure gas source 6 by pipeline, pipeline between total solenoid electric valve 801 of gas circuit and the pressure gas source 6 is provided with pressure transducer 7, pressure transducer 7 is used for detecting the air pressure signal on the gas circuit, and this atmospheric pressure value is fed back to Control Component 9.
Principle of work: the total solenoid electric valve 801 of gas circuit is gas total valves, when inoperation, is used for disconnecting whole gas circuit.In the time will extracting quantitative liquid, under the control of Control Component 9, the total solenoid electric valve 801 of gas circuit to be opened, the pressed gas of coming from pressure gas source 6 enters into gas circuit part flow arrangement 8.Then, the switching by second solenoid electric valve 803 allows pressed gas enter into cavity of resorption 102 through second wireway 11, simultaneously by the switching of first solenoid electric valve 802, epicoele 101 is communicated with outside air by first wireway 10.Because the pressure of pressed gas is greater than outside air, therefore can force barrier film 5 to drive stroke pins 4 segment distance that up moves, stroke pin 4 will leave the inlet of capillary metering drain pipe 3, make the liquid in the liquid storing part 2 enter in the capillary metering drain pipe 3, by 3 outputs of capillary metering drain pipe.When liquid reaches aequum, under the control of Control Component 9, switching by second solenoid electric valve 803 makes cavity of resorption 102 be communicated with outside air by second wireway 11, and the switching by first solenoid electric valve 802 simultaneously allows pressed gas enter into epicoele 101 through first wireway 10.Because the pressure of pressed gas greater than outside air, therefore can force barrier film 5 to drive stroke pins 4 segment distance that down moves, stroke pin 4 inserts the inlet of capillarys metering drain pipes 3, turn-offs liquid storing part 2 and measures being communicated with between drain pipe 3 inlets with capillary.In said process, accurately control by the coordination time of 9 pairs first solenoid electric valves of Control Component 802, second solenoid electric valve 803, just can accurately control the amount of liquid that enters capillary metering drain pipe 3.
The above only is a preferred implementation of the present invention, and protection scope of the present invention also not only is confined to the foregoing description, and all technical schemes that belongs under the thinking of the present invention all belong to protection scope of the present invention.Should be pointed out that for those skilled in the art in the some improvements and modifications that do not break away under the principle of the invention prerequisite, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (4)

1. Pneumatic control type accurate measuring device, it is characterized in that: comprise metering cavity (1), liquid storing part (2), capillary metering drain pipe (3), stroke pin (4), barrier film (5), gas circuit shunt assembly (8) and Control Component (9), the inside that described barrier film (5) will measure cavity (1) is separated into separately independently epicoele (101) and cavity of resorption (102), described liquid storing part (2) is arranged in metering cavity (1) and is communicated with the inlet of capillary metering drain pipe (3), described stroke pin (4) is arranged in cavity of resorption (102), the upper end of described stroke pin (4) is connected in barrier film (5) and goes up also and can move with barrier film (5), the lower end of described stroke pin (4) cooperates the control break-make with the inlet of capillary metering drain pipe (3), described epicoele (101) is communicated with gas circuit shunt assembly (8) by first wireway (10), described cavity of resorption (102) is communicated with gas circuit shunt assembly (8) by second wireway (11), and described gas circuit shunt assembly (8) links to each other with Control Component (9).
2. Pneumatic control type accurate measuring device according to claim 1, it is characterized in that: described gas circuit shunt assembly (8) comprises total solenoid electric valve of gas circuit (801) and first solenoid electric valve (802) that is connected with the total solenoid electric valve of gas circuit (801) respectively by pipeline, second solenoid electric valve (803), described first solenoid electric valve (802) is communicated with first wireway (10) and finishes the switching that is communicated with outside air or pressure gas source (6), and described second solenoid electric valve (803) is communicated with second wireway (11) and finishes the switching that is communicated with outside air or pressure gas source (6).
3. Pneumatic control type accurate measuring device according to claim 2, it is characterized in that: the total solenoid electric valve of described gas circuit (801) is communicated with pressure gas source (6) by pipeline, and the pipeline between total solenoid electric valve of described gas circuit (801) and the pressure gas source (6) is provided with pressure transducer (7).
4. according to claim 1 or 2 or 3 described Pneumatic control type accurate measuring devices, it is characterized in that: the upper/lower terminal of described metering cavity (1) is respectively equipped with top cover labyrinth (103) and lower sealing cover (104).
CN2010101555466A 2010-04-26 2010-04-26 Pneumatic control type accurate measuring device Active CN101813504B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2559970Y (en) * 2002-08-27 2003-07-09 段祥照 Electronic liquid level gauge
US6826953B2 (en) * 2002-07-19 2004-12-07 Celerity Group, Inc. Flow sensor
CN2847236Y (en) * 2005-11-24 2006-12-13 山东省科学院海洋仪器仪表研究所 Digital capillary flow detector
CN2901271Y (en) * 2006-06-14 2007-05-16 中国石油天然气集团公司 Flange diaphragm sealed liquid level and pressure transmitter
CN201637442U (en) * 2010-04-26 2010-11-17 长沙华时捷环保科技发展有限公司 Pneumatic control type precise metering device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6826953B2 (en) * 2002-07-19 2004-12-07 Celerity Group, Inc. Flow sensor
CN2559970Y (en) * 2002-08-27 2003-07-09 段祥照 Electronic liquid level gauge
CN2847236Y (en) * 2005-11-24 2006-12-13 山东省科学院海洋仪器仪表研究所 Digital capillary flow detector
CN2901271Y (en) * 2006-06-14 2007-05-16 中国石油天然气集团公司 Flange diaphragm sealed liquid level and pressure transmitter
CN201637442U (en) * 2010-04-26 2010-11-17 长沙华时捷环保科技发展有限公司 Pneumatic control type precise metering device

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