CN2352948Y - Automatic constant device for sampling atmosphere - Google Patents
Automatic constant device for sampling atmosphere Download PDFInfo
- Publication number
- CN2352948Y CN2352948Y CN 98248161 CN98248161U CN2352948Y CN 2352948 Y CN2352948 Y CN 2352948Y CN 98248161 CN98248161 CN 98248161 CN 98248161 U CN98248161 U CN 98248161U CN 2352948 Y CN2352948 Y CN 2352948Y
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- China
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- aspiration pump
- microcomputer processor
- utility
- model
- flow signal
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Abstract
The utility model relates to an atmosphere sampling device. The utility model is designed for solving the problems of high energy consumption, large weight and volume, inconvenient maintenance, low accuracy, etc. existing in the previous device. The utility model has the structure that a mass flow sensor A after connecting with a gas capacity F in series is connected with a sucking pump E; the flow signal of a mass flow meter A is amplified by a flow signal amplifying circuit B and is inputted to a microcomputer processor C, and the output control signal of the microcomputer processor C is connected with the speed regulation circuit D of the sucking pump. The device has small required power, small noise and small volume, energy can be saved by 60%, maintenance cost is reduced by 70%, the weight is only 9.4 kilograms, and each technical index for a long time operation can achieve the requirement.
Description
The utility model relates to a kind of atmospheric sampling device, belongs to environmental technology field.
Along with the modernization that world industry is produced, environmental pollution increasingly sharpens, and has constituted the serious threat to level of human health, and it is very urgent to strengthen environmental protection.SO
2With NO
xBe major pollutants in the atmosphere, correctly estimate SO in the atmosphere
2And NO
xContent is significant." 24 hours automatic constant current sampling thiefs of atmosphere " is SO in a kind of mensuration atmosphere
2And NO
xThe important environment supervision instrument of content.According to the regulation of country's " constant temperature air sampler technical requirement continuously automatically in 24 hours ", air must be crossed absorption liquid with the velocity flow of 0.2L/min.Constant current is that sampling thief one is big crucial, and existing 24 hours sampling thiefs of atmosphere adopt kapillary or injection needle to realize constant current as metering hole more, and its principle is when enough pressure differentials are kept at the metering hole two ends, and it is constant that sampling flow can keep.Owing to will reach very high pressure differential, so the required power of bleeding of this method is big, generally to adopts the high negative pressure compressor as the instrument power of sampling, thereby make compressor volume and weight huge, power consumption is high, safeguards inconvenient (needing regularly to add transformer oil and start cleaning).Adopt the metering hole constant current in addition,, be easy to be stopped up, be difficult to keep for a long time constant flow, cause O﹠M very inconvenient by dust because the aperture is minimum.Adopt the metering hole constant current, its flow also is subject to the influence of ambient temperature.
The purpose of this utility model just provides that a kind of volume is little, in light weight, constant current accuracy is high, the atmosphere automatic constant current sampling thief of easy care, to dwindle the volume and weight of complete machine, improve the complete machine performance, reduce complete machine energy consumption and maintenance cost, make monitoring more convenient, accurate.
The utility model is achieved in that by behind the mass flowmeter A serial connection air-capacitor F, meet aspiration pump E again, the flow signal of mass flowmeter A is input microcomputer processor C after flow signal amplifying circuit B amplifies, and the output control signal of microcomputer processor C meets aspiration pump alignment circuit D.
The utility model adopts mass flowmeter and Computer Control Technology to realize the constant current of atmospheric sampling, has changed original metering hole current limiting technique, does not use parts such as kapillary, thereby also need not High Pressure Difference, also greatly reduces the requirement to the power of bleeding thus.Use small and exquisite aspiration pump to dwindle volume in the device, saved the energy.Use this device only to need calibration half a year once, other are all non-maintaining.This device is not subjected to Temperature Influence yet in addition, and adopts computer control, and constant current accuracy is improved, and uses more convenient, accurate
Below in conjunction with accompanying drawing the utility model is described further.
Fig. 1 is a structured flowchart of the present utility model.
Fig. 2 is an aspiration pump alignment circuit structural drawing.
Fig. 3 is the flow chart of microcomputer processor.
As shown in Figure 1, A is a mass flowmeter, B is the flow signal amplifying circuit, C is the microcomputer processor, D is the aspiration pump alignment circuit, and E is an aspiration pump, and F is an air-capacitor, wherein mass flowmeter A and air-capacitor F all can adopt existing conventional articles for use, also adopt conventional pipeline to be connected in series mutually between mass flowmeter A, air-capacitor F and the aspiration pump E.Aspiration pump E can use scraper pump, and its volume is little, power consumption is few, and flow signal amplifying circuit B also is conventional amplifying circuit, and microcomputer processor C can adopt 51 series monolithics such as grade.
Aspiration pump alignment circuit (as shown in Figure 2) is to be master element with the MOS control tube, and the input end of MOS control tube is connected to the HSO end of microcomputer processor C, and supply voltage is connected on this input end through resistance R, and the output terminal of MOS control tube is via diode D
1, inductance L and capacitor C
1Behind the current rectifying and wave filtering circuit that constitutes, through the contact of relay J J
1Meet aspiration pump E, relay J is connected on the P of microcomputer processor C
1.3 on the end.
The course of work of the present utility model is: start aspiration pump E, air to air-capacitor F, is sent (Fig. 1) by aspiration pump E through mass flowmeter A again.When air flows through mass flowmeter A, the signal of its output one reflection flow size, this signal is defeated by single-chip microcomputer C after flow signal amplifying circuit B amplifies, single-chip microcomputer compares with preset range (Fig. 3) after this signal is carried out mould/number conversion, if greater than the upper bound, then reduce output pulse width, control aspiration pump alignment circuit D reduces the operating voltage of aspiration pump E, thereby reduces motor speed, and air mass flow is reduced.If flow signal then increases output pulse width less than the default lower bound of single-chip microcomputer, control aspiration pump alignment circuit D improves the operating voltage of aspiration pump E, and motor speed is improved, and flow increases.By the continuous acquisition of flow signal, make single-chip microcomputer constantly send whole steering order, thereby make air volume keep constant.Among Fig. 2, the aspiration pump alignment circuit is the pulsewidth of regulating PWM by single-chip microcomputer C, the ON time of regulating the MOS control tube, thereby the size of the output voltage of change rectifier filer.This output voltage is the operating voltage of aspiration pump E, and its numerical values recited has determined the rotating speed height of aspiration pump.Whether relay J is by single-chip microcomputer C control adhesive or disconnection, work with the control aspiration pump.
The utility model is good through evidence constant current performance, and the instrument required drive is little, can economize on electricity 60%, and maintenance cost reduces by 70%.This device noise is little, and volume is little, only 9.4 kilograms of weight, and every technical indicator that works long hours all can reach requirement.
Claims (2)
1, a kind of atmosphere automatic constant current sampling thief, after it is characterized in that this device is by mass flowmeter A serial connection air-capacitor F, meet aspiration pump E again, the flow signal of mass flowmeter A is input microcomputer processor C after flow signal amplifying circuit B amplifies, and the output control signal of microcomputer processor C meets aspiration pump alignment circuit D.
2, atmosphere automatic constant current sampling thief according to claim 1, it is characterized in that aspiration pump alignment circuit D is a master element with the MOS control tube, the input end of MOS control tube is connected to the HSO end of microcomputer processor C, supply voltage is connected on this input end through resistance R, and the output terminal of MOS control tube is via diode D
1, inductance L and capacitor C
1Behind the current rectifying and wave filtering circuit that constitutes, J1 meets aspiration pump E through the contact of relay J, and relay J is connected on the P1.3 end of microcomputer processor C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98248161 CN2352948Y (en) | 1998-11-16 | 1998-11-16 | Automatic constant device for sampling atmosphere |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98248161 CN2352948Y (en) | 1998-11-16 | 1998-11-16 | Automatic constant device for sampling atmosphere |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2352948Y true CN2352948Y (en) | 1999-12-08 |
Family
ID=33993229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98248161 Expired - Fee Related CN2352948Y (en) | 1998-11-16 | 1998-11-16 | Automatic constant device for sampling atmosphere |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2352948Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106769258A (en) * | 2017-01-13 | 2017-05-31 | 北京中科中环环境应用技术研究中心 | A kind of constant current air sampler and its sampling constant current method |
-
1998
- 1998-11-16 CN CN 98248161 patent/CN2352948Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106769258A (en) * | 2017-01-13 | 2017-05-31 | 北京中科中环环境应用技术研究中心 | A kind of constant current air sampler and its sampling constant current method |
| CN106769258B (en) * | 2017-01-13 | 2023-10-31 | 北京中科中环环境应用技术研究中心 | Constant-current air sampler and constant-current sampling method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |