CN201628636U - Accurate liquid extracting and metering device - Google Patents
Accurate liquid extracting and metering device Download PDFInfo
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- CN201628636U CN201628636U CN2009201763207U CN200920176320U CN201628636U CN 201628636 U CN201628636 U CN 201628636U CN 2009201763207 U CN2009201763207 U CN 2009201763207U CN 200920176320 U CN200920176320 U CN 200920176320U CN 201628636 U CN201628636 U CN 201628636U
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Abstract
An accurate liquid extracting and metering device comprises a pump, a valve unit, an electromagnetic stop valve, a liquid storage unit, a testing module, a liquid detector A and a liquid detector B. The valve unit is provided with a liquid inlet passage, a testing passage, a liquid discharge passage and a common passage, the liquid inlet passage of the valve unit is connected with liquid, the testing passage is connected with the testing module, the liquid discharge passage is connected with air, the common passage is connected with one end of the liquid detector A via the electromagnetic stop valve, the other end of the liquid detector A is connected with one end of the liquid storage unit, the other end of the liquid storage unit is connected with one end of the liquid detector B, and the other end of the liquid detector B is connected with the pump.
Description
Technical field
The utility model relates to the liquid sampling metering in the field of environment protection water quality monitoring instrument, relates in particular to a kind of accurate liquid extracting and metering device.
Background technology
The liquid sampling measuring apparatus is one of core component of water quality monitoring instrument, and the precision of measuring apparatus and reliability have directly determined the accuracy of testing result and the reliability of instrument, and the dexterity of device has determined reusability, R﹠D cycle and the cost of instrument.At present, the liquid sampling measurement technology that is applied to the water quality on-line monitoring instrument device mainly contains three classes:
(1) induction that utilizes sensor that it's moment is past flow of liquid in the conduit, the flow velocity by control pump and realize metering switching time to liquid volume, principle is as shown in Figure 1.This technology relates generally to reagent injection pump 1, sensor 2, binary valve 3 devices such as grade.This technical pattern is simple, and cost is lower, operation, easy to maintenance.But it requires harshness to the rotating speed of reagent injection pump, and unstable rule has a strong impact on accuracy of measurement if pump turns round; And do not have indemnifying measure, and can not eliminate bubble in the liquid to the influence of measurement result, reliability is relatively poor; Simultaneously, sensor is vulnerable to the strong sewage infringement of corrosivity, and the degree of accuracy of entire equipment is subjected to the restriction of sensor accuracy.
(2) use gauge line to measure, as shown in Figure 2 with fixed volume.This technology relates generally to signal wire 4, gas blow pipe 5, run-down pipe 6, distillation water pipe 7, jigger pipe cap 8, liquid 10 in the probe 9, jigger, fastening nut 11, O RunddichtringO 12, solenoid valve 13 etc.Liquid enters jigger by the device bottom, and probe can the notice control system stop sample introduction after detecting liquid, and the fixed volume in the jigger is the volume of the liquid of getting.This installation cost is lower, and is easy to operate, but the liquid volume of institute's energy measurement fixes, and dirigibility is relatively poor, and probe is vulnerable to corrosion.
(3) utilize the pulling stroke of step motor control syringe pump, flow of liquid is out-of-date, thereby can receive the volume of signal control influent at two fixing photoelectric sensors of bottom of device, as shown in Figure 3.This technology relates generally to syringe pump 14, photoelectric sensor 15 etc.This device has higher sampling precision, various impurity in the sewage can influence the power of light signal, but the reliability of device is too dependent on the sensitivity of optical sensor, drawing process must slowly carry out, the volume that single extracts liquid is subjected to the syringe pump capacity limitation, and the dirigibility of the liquid volume of institute's energy measurement shortage, and every kind of cubing demand all needs a pair of photoelectric sensor, so complex structure, cost is bigger.
As seen, the measuring apparatus of prior art all exists significant disadvantages: apparatus structure simply may be inaccurate to the metering of liquid; Guarantee that precision then needs the sensor of design specialized liquid storage container and additional some, system's relative complex, reusability is poor.
Summary of the invention
At the deficiency of existing measuring apparatus and method, the utility model provides a kind of design cost low, simple and reliable, and flexibly changing sampling liquid volume, realizes the device of accurate liquid extracting metering.
A kind of accurate liquid extracting and metering device, it is characterized in that: comprise pump, valve cell, electromagnet cut off valve, the liquid storage unit, test module, detector of liquid A and detector of liquid B, has feed pathway on the described valve cell, test channel, apocenosis passage and the public passage that is connected described liquid storage unit, the feed pathway of described valve cell is connected with liquid phase, described test channel is connected with described test module, described apocenosis passage is connected with described air, described public passage is connected with the end of described detector of liquid A through described electromagnet cut off valve, the other end of described detector of liquid A is connected with an end of described liquid storage unit, the other end of described liquid storage unit is connected with the end of described detector of liquid B, and the other end of described detector of liquid B is connected with described pump.
Description of drawings
Fig. 1 is a measuring apparatus of utilizing sensor in the prior art;
Fig. 2 is a measuring apparatus of using the gauge line with fixed volume in the prior art;
Fig. 3 utilizes the pulling stroke of step motor control syringe pump and its bottom to have the measuring apparatus of two photoelectric sensors in the prior art;
Fig. 4 is the structural representation of the utility model metering system
Fig. 5 is the metering system structural drawing of an embodiment of the utility model
Fig. 6 be the utility model metering system get liquid measurement flow figure
Embodiment
Figure 4 shows that the utility model metering system structural representation, mainly by valve cell 16, electromagnet cut off valve 17, detector of liquid A 18, liquid storage unit 19, detector of liquid B 20, pump 21 6 parts are formed, wherein the feed pathway P1 of valve cell 16 is connected with liquid (perhaps reagent), test channel P2 is connected with test module, apocenosis passage P3 is connected with air, the public passage of valve cell 16 is connected with the end of detector of liquid A 18 through electromagnet cut off valve 17, the other end of detector of liquid A 18 is connected with an end of liquid storage unit 19, and the other end of liquid storage unit 19 is connected with the end of detector of liquid B 20, and detector of liquid B 20 other ends are connected with pump 21.Wherein valve cell 16 is used for the switching selection of pipe passage; When electromagnet cut off valve 17 switches selection at pipe passage, be used to prevent that liquid are drawn back stream owing to the pressure variation causes in the liquid storage unit 19, thereby cause the cross pollution between the inaccurate or different reagent of metering.Liquid storage unit 19 is used for the storage of liquid or reagent; Pump 21 is used for the extraction of air, and the conveying of liquid; Detector of liquid A 18 is used for the perception and the detection of liquid; Detector of liquid B 20 is used for the demarcation of the long-pending parameter of metering process microbody.The utility model at the uniform velocity under the condition of sample introduction, utilizes the efficiently sampling that program scans detector of liquid A fast to count at peristaltic pump, simultaneously electromagnet cut off valve is carried out high-speed switch control, thereby sensitive, accurately get liquid.
Fig. 5 is the metering system structural drawing of an embodiment of the utility model, and wherein valve cell 16 is selected the hyperchannel selection valve for use; Electromagnet cut off valve 17 is selected the electromagnetic isolation valve for use, and is open type; Liquid storage unit 19 adopts the shape of the utility model unique design, is about to the helix round that the pipeline coiled has certain number of turn, forms the liquid storage ring; Pump 21 is selected peristaltic pump for use; Two detector of liquid A, B select contactless liquid in pipe detecting device.Wherein the feed pathway of valve cell 16 is connected with liquid phases such as water sample, distilled water and all ingredients, apocenosis passage is connected with atmosphere, test channel is connected with test module, and the public passage of valve cell 16 is connected with electromagnetic isolation valve 17, detector of liquid A 18, liquid storage unit 19, detector of liquid B 20, peristaltic pump 21 successively.
The course of work of the utility model in the water quality monitoring instrument can be divided into following three phases:
Phase one: after circuit is connected, whole metering system is in running order, programmed control hyperchannel selection valve 16 is selected feed pathway, this moment, pipeline and liquid were connected, open electromagnetic isolation valve 17, peristaltic pump 21 begins extracting air from pipeline, under the effect of air pressure, liquid inflow pipe, and flow in the liquid storage ring 19, simultaneously under the control of program, make fluid preservation in liquid storage ring 19, when detector of liquid A 18 detects sample volume and reaches the desired value that sets, close electromagnetic isolation valve 17, peristaltic pump 21 quits work.
Subordinate phase: hyperchannel selection valve 16 is selected test channel, opens electromagnetic isolation valve 17, and peristaltic pump 21 antiports are blown in pipeline, and the liquid in the liquid storage ring 19 is all pushed in the test module 1.Get the liquid metering and finish, promptly accurately obtain liquid.
In the above-mentioned course of work, when getting liquid metering when reaching desired value, close electromagnetic isolation valve 17 earlier, and then control peristaltic pump 21 quits work, purpose is to prevent peristaltic pump in the slow moment that stops, and causes that liquid is crossed to take out phenomenon.When the hyperchannel selection valve is switched selection at pipe passage, since its valve body with get the liquid liquid level and have difference in height, liquid in the feed pathway can fall after rise under action of gravity, cause valve inner pressure to reduce, simultaneously because the existence of liquid storage ring 19 tail air posts, pipeline produces pressure differential between liquid storage ring 19 and the valve body at this moment, thereby cause that the liquid backflow in the liquid storage ring 19 enters valve inner, cause the cross pollution of measuring inaccurate or reagent, adopt the aforesaid operations order, can avoid the liquid backflow in the liquid storage ring 19 to take out.
Phase III: liquid is after tested after module 1 test, hyperchannel selection valve 16 is selected test channel P2, peristaltic pump 21 all is withdrawn into the liquid in the test module 1 in the liquid storage ring 19, and then the liquid in the liquid storage ring 19 is transferred in the test module 2, carries out the test of other functions.Test finishes, and programmed control hyperchannel selection valve 19 is selected apocenosis passage, and the liquid after measurement is finished enters in the waste collection device.
Figure 6 shows that the utility model gets liquid measurement flow figure, it is as follows specifically to get liquid metering method and flow process:
Suppose that extracting metered volume is the liquid of V.After circuit is connected and is started, setting two detector of liquid sense cycle is 5ms, hyperchannel selection valve 16 is selected feed pathway, open electromagnetic isolation valve 17, peristaltic pump 21 entrys into service, in liquid suction pipeline, liquid inflow pipe, and flow in the liquid storage ring 19, under the control of program, make fluid preservation in liquid storage ring 19, reach when setting desired value, close electromagnetic isolation valve 17 when detector of liquid A detects sample volume, peristaltic pump 21 shuts down, and setting detector of liquid A18 this moment is V to the liquid volume of pipeline between the liquid storage ring 19 (comprising liquid storage ring 19)
c, program scanning is N to the pairing efficiently sampling point value of detector of liquid A18 simultaneously.
Suppose the long-pending Δ V of being of microbody of 1 timing point correspondence, then detector of liquid A18 is to the volume V of pipeline between the liquid storage ring 19 (comprising liquid storage ring 19) liquid
cFor
V
c＝ΔV×N (1)
Liquid volume between setting hyperchannel selection valve 16 and the detector of liquid A 18 in the pipeline is zero volume V
0, when getting the liquid metering, when detector of liquid A 18 detects liquid, close electromagnetic isolation valve 17, stop to extract liquid, hyperchannel selection valve 16 is selected apocenosis passage P3, and this part liquid is discharged, by the standard metering instrument, measure this part liquid volume, repeat repeatedly can obtain accurate V
0
According to equation (1) and zero volume V
0, can draw the value of metering liquid volume V:
V＝V
0+V
c (2)
That is: V=V
0+ Δ V * N (3)
In order accurately to obtain liquid V, need only pass through detector of liquid A, accurately the control detection points N gets final product,
That is:
Get at the utility model and to relate to a measurement unit Δ V in the liquid metering method, Δ V is that the microbody of 1 timing point correspondence is long-pending, and the concrete scaling method of little volume delta V is as follows:
Scaling method is: with the volume V ' between two detector of liquid divided by the detection points N of 1# sensor ', it is long-pending promptly to draw microbody:
ΔV＝V′/N′
Concrete demarcation flow process is as follows:
Programmed control hyperchannel selection valve 16 is selected feed pathway, this moment, pipeline and liquid were connected, open electromagnet cut off valve 17, peristaltic pump 21 begins extracting air from pipeline, under the effect of air pressure, liquid inflow pipe, through liquid storage ring 19, when detector of liquid B20 detects liquid, close electromagnetic isolation valve 17, peristaltic pump 21 shuts down, and this moment, program scanning was N ' to detector of liquid A 18 pairing efficiently sampling point value.
Because the liquid volume that records between hyperchannel selection valve 16 and the detector of liquid A18 is V
0, then the volume V ' of pipeline is between two detector of liquid AB
V′＝V
M-V
0 (5)
Then little volume delta V is:
ΔV＝V′/N′ (6)
Microbody is long-pending to be demarcated, and is mainly used in the liquid volume of determining 1 timing point correspondence first.In the process of metering and demarcation, the pump flow stream velocity must be consistent and be stable.According to actual test case, deviation appears if get the liquid precision, or the variation of pump flow velocity, need revise demarcation.
Existing relatively liquid extracting and metering device and method the utlity model has following advantage:
1. this method is still based on pump liquid prerequisite at the uniform velocity, but get the long-pending metering method of liquid and be the effective periodic sampling of recording liquid detecting device count (promptly detecting counting of liquid), promptly calculate and effectively get liquid time series section sum in the mode of Digital Discrete, that is liquid is effectively flowed through time of detector of liquid, can effectively screen bubble, the error that can effectively avoid existing continuous clocking method (Fig. 1) to bring because of bubble in the pipeline, programmed control is simple;
2. can obtain different sampling precisions by the change sampling period, the cycle is more little, and precision is high more, adopts a pair of detector of liquid to carry out can controlling in program and regularly demarcating from demarcating, and can guarantee that system works is reliable and stable;
3. as preferred, can adopt liquid storage ring instead of dedicated fluid storage device,, help reducing the volume of system to reduce the complicacy of system;
4. adopt this metering method, pump only flows air, has no chance all the time to contact with liquid or reagent, can not corroded.Can guarantee the serviceable life that pump is long like this.
5. change the length of liquid storage ring, but sample volume is set in bigger spreading range continuously, device reusability height, metering efficient height helps shortening the instrument development cycle, reduces cost.
6. when the valve cell pipe passage switched selection, electromagnet cut off valve can be used to prevent that the liquid in the liquid storage unit from causing backflow because pressure changes, thereby causes the cross pollution between the inaccurate or different reagent of metering.
7. detector of liquid B 20 is used for the demarcation of the long-pending parameter of metering process microbody, also defines the maximum upper limit of getting liquid, plays the function of alarm and protection.
The utility model embodiment disclosed herein is exemplary, and it only is for explanation that the utility model is made an explanation, and is not to restriction of the present utility model, and for example: pump is not limited to peristaltic pump, also can be syringe pump, ram pump; Valve cell is not limited to the hyperchannel selection valve, also can be the solenoid valve of townhouse; Electromagnet cut off valve is not limited to the electromagnetic isolation valve, also can be pinch valve; The liquid storage unit is not limited to the liquid storage ring, also can be the device for storing liquid of other forms such as liquid storage pipe; Detector of liquid is not limited to contactless liquid in pipe detecting device, also can be the detector of liquid of other form.It will be appreciated by those skilled in the art that these predictable improvement and expansion are included within the protection domain of the present utility model.
Claims (8)
1. accurate liquid extracting and metering device, it is characterized in that: comprise pump, valve cell, electromagnet cut off valve, the liquid storage unit, test module, detector of liquid A and detector of liquid B, has feed pathway on the described valve cell, test channel, apocenosis passage and the public passage that is connected described liquid storage unit, the feed pathway of described valve cell is connected with liquid phase, described test channel is connected with described test module, described apocenosis passage is connected with air, described public passage is connected with the end of described detector of liquid A through described electromagnet cut off valve, the other end of described detector of liquid A is connected with an end of described liquid storage unit, the other end of described liquid storage unit is connected with the end of described detector of liquid B, and the other end of described detector of liquid B is connected with described pump.
2. accurate liquid extracting and metering device according to claim 1 is characterized in that:
Described pump can be peristaltic pump, syringe pump or ram pump.
3. accurate liquid extracting and metering device according to claim 1 is characterized in that:
Described detector of liquid A and detector of liquid B can or be other forms of detector of liquid for contactless liquid in pipe detecting device.
4. accurate liquid extracting and metering device according to claim 1 is characterized in that:
Described valve cell can be hyperchannel selection valve or townhouse solenoid valve.
5. accurate liquid extracting and metering device according to claim 1 is characterized in that:
Described electromagnet cut off valve can be electromagnetic isolation valve or pinch valve.
6. accurate liquid extracting and metering device according to claim 1 is characterized in that:
Described liquid storage unit can or be liquid storage pipe for the liquid storage ring of the helix round that the pipeline coiled had certain number of turn.
7. accurate liquid extracting and metering device according to claim 1 is characterized in that:
Described detector of liquid B is used for demarcating the demarcation of the long-pending parameter of metering process microbody, also defines the maximum upper limit of getting liquid, plays the function of alarm and protection.
8. accurate liquid extracting and metering device according to claim 1 is characterized in that:
Switch when selecting at described valve cell pipe passage, described electromagnet cut off valve is used to prevent that liquid described liquid storage unit in from because pressure changes and causes and draw back stream, causing the cross pollution of measuring between the inaccurate or different reagent.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201763207U CN201628636U (en) | 2009-09-02 | 2009-09-02 | Accurate liquid extracting and metering device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201763207U CN201628636U (en) | 2009-09-02 | 2009-09-02 | Accurate liquid extracting and metering device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692519A (en) * | 2011-03-24 | 2012-09-26 | 江苏江分电分析仪器有限公司 | Multipath liquid sampler |
| CN103185619A (en) * | 2011-12-28 | 2013-07-03 | 深圳市蓝韵实业有限公司 | Measurement method and measurement device used for precisely quantifying liquid volume |
| CN103353513A (en) * | 2013-07-12 | 2013-10-16 | 杭州辉道环境技术有限公司 | Liquid path system based on unit metering and use method thereof |
| CN101655423B (en) * | 2009-09-02 | 2013-12-25 | 广州市怡文环境科技股份有限公司 | Accurate liquid extracting and metering device and method |
| CN104764860A (en) * | 2015-04-16 | 2015-07-08 | 肖巍 | Analyzing and metering device and liquid analysis system |
| CN105004874A (en) * | 2015-07-03 | 2015-10-28 | 深圳世绘林科技有限公司 | Autoinjection and dosage measuring method |
| CN108061670A (en) * | 2016-11-09 | 2018-05-22 | 郑州富铭环保科技有限公司 | One kind takes liquid detection device |
| CN108444562A (en) * | 2018-06-21 | 2018-08-24 | 水利部南京水利水文自动化研究所 | A kind of liquid-volume measurement apparatus |
| CN108627212A (en) * | 2018-05-10 | 2018-10-09 | 北京红海科技开发有限公司 | Tool, container and the method taken for liquid meter |
| WO2020135618A1 (en) * | 2018-12-27 | 2020-07-02 | 深圳市帝迈生物技术有限公司 | Liquid addition apparatus, analyzer, and liquid addition method |
-
2009
- 2009-09-02 CN CN2009201763207U patent/CN201628636U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101655423B (en) * | 2009-09-02 | 2013-12-25 | 广州市怡文环境科技股份有限公司 | Accurate liquid extracting and metering device and method |
| CN102692519B (en) * | 2011-03-24 | 2015-04-15 | 江苏江分电分析仪器有限公司 | Multipath liquid sampler |
| CN102692519A (en) * | 2011-03-24 | 2012-09-26 | 江苏江分电分析仪器有限公司 | Multipath liquid sampler |
| CN103185619A (en) * | 2011-12-28 | 2013-07-03 | 深圳市蓝韵实业有限公司 | Measurement method and measurement device used for precisely quantifying liquid volume |
| CN103353513B (en) * | 2013-07-12 | 2015-12-23 | 肖巍 | A kind of liquid-way system based on unit metering and using method thereof |
| CN103353513A (en) * | 2013-07-12 | 2013-10-16 | 杭州辉道环境技术有限公司 | Liquid path system based on unit metering and use method thereof |
| CN104764860A (en) * | 2015-04-16 | 2015-07-08 | 肖巍 | Analyzing and metering device and liquid analysis system |
| CN105004874A (en) * | 2015-07-03 | 2015-10-28 | 深圳世绘林科技有限公司 | Autoinjection and dosage measuring method |
| CN108061670A (en) * | 2016-11-09 | 2018-05-22 | 郑州富铭环保科技有限公司 | One kind takes liquid detection device |
| CN108627212A (en) * | 2018-05-10 | 2018-10-09 | 北京红海科技开发有限公司 | Tool, container and the method taken for liquid meter |
| CN108444562A (en) * | 2018-06-21 | 2018-08-24 | 水利部南京水利水文自动化研究所 | A kind of liquid-volume measurement apparatus |
| CN108444562B (en) * | 2018-06-21 | 2023-12-05 | 水利部南京水利水文自动化研究所 | Liquid volume metering device |
| WO2020135618A1 (en) * | 2018-12-27 | 2020-07-02 | 深圳市帝迈生物技术有限公司 | Liquid addition apparatus, analyzer, and liquid addition method |
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Address after: 510730 Guangzhou economic and Technological Development Zone, Guangdong City, South Road, No. three, No. 12 Patentee after: Yiwen Environmental Science Technology Co., Ltd. Address before: 3 building, B building, No. 885 Shenzhou Road, Guangzhou Science City, Guangdong, Guangzhou, Luogang District 510335, China Patentee before: Yiwen Environmental Science Technology Co., Ltd. |
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