CN217277177U

CN217277177U - Automatic calibration system for atmospheric sampler

Info

Publication number: CN217277177U
Application number: CN202220732474.5U
Authority: CN
Inventors: 骆新峥; 黄志煌
Original assignee: Fujian Metrology Institute
Current assignee: Fujian Metrology Institute
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2022-08-23
Anticipated expiration: 2032-03-31

Abstract

The utility model provides an automatic calibration system of atmospheric sampling ware, including flowmeter device, platinum resistance temperature sensor, gas circuit pressure sensor, data processing unit and display element, the flowmeter device includes first flowmeter, second flowmeter, third flowmeter and three select a solenoid valve, three select a solenoid valve and the first interface connection of one two select a solenoid valve, the second interface of two select a solenoid valve is connected with one end of an air-vent valve, the other end of air-vent valve respectively with the third interface connection of atmospheric sampling ware and two select a solenoid valve; the pressure regulating valve, the two-out-of-one electromagnetic valve and the three-out-of-one electromagnetic valve are respectively and electrically connected with the data processing unit and are controlled by the data processing unit. The utility model provides an atmospheric sampling ware calbiration system can realize the flow range at the no-load of 1ml/min ~ 1400L/min and the measurement of different on-load pressures, satisfies different instruments and testing environment's measurement demand.

Description

Automatic calibration system for atmospheric sampler

Technical Field

The utility model relates to an atmospheric sampling ware detects technical field, indicates a gas enrichment ware automatic calibration system very much.

Background

The atmospheric pollutants refer to those substances which are discharged into the atmosphere due to human activities or natural processes and have harmful effects on humans and the environment, and mainly include particulate matters, nitrogen oxides, sulfur dioxide, and the like. To effectively treat the atmospheric pollution, firstly, the components and sources of each pollutant are known, and a scheme and comprehensive treatment are specifically established. Atmospheric sampling equipment and analytical detection equipment are then required to determine the composition and concentration of atmospheric pollutants. The working principle is to use a sampling pump to pump samples, and to make the measured object achieve quantitative collection by different steady flow measures and synchronous timing methods. The metering accuracy in the collection process of the atmosphere sampler plays a crucial role in analyzing the concentration of the amount of the gas pollutants, so that the ambient air atmosphere sampler needs to be calibrated when leaving a factory, needs to be calibrated in the use process, needs to be metered and calibrated during use, and the measurement value of the measurement result needs to be accurately traced.

At present, a plurality of samplers for collecting pollutants are provided, wherein gas pollutants such as VOCs, sulfur dioxide, carbon oxides, carbon monoxide and the like are detected from particulate matters in exhaust gas of a fixed pollution source according to GB/T16157-1996 and are sampled at a flow rate of 20 mL/min-3L/min or even larger, and the load capacity requirements of the samplers are respectively class A (carrying 0.5kPa), class B (carrying 4.5kPa) and class C (carrying 8.0 kPa). For dust pollutants such as fluoride, heavy metal, TSP, PM10 and PM2.5 in environmental air, according to the technical requirements of HJ/T374-2007 total suspended particulate sampler and the detection method, the sampling flow rate of the pollutants is divided into different flow rate requirements such as 16.7L/min, 50.0L/min and 100.0L/min, the load capacity requirement can reach more than 20kPa, and for large-flow dust sampling, the flow rate even reaches 1m ³ And/min. The prior Chinese patent with the application number of 201820273819.9, namely an automatic calibrating device of an air sampler and the Chinese patent with the application number of 201520405198.1, namely an automatic calibrating device of an environment-friendly air sampler, adopts a soap film flowmeter, the measuring range of the flowmeter is only 10 mL/min-30L/min, and when the flowmeter is used, the flowmeter is used as the flowmeterWhen the flow is too big, can influence the formation of soap film in the soap film pipe, make measuring error too big, just can't use this type of self-checking device to the sample thief of bigger gas flow, and present atmosphere collector calibrating device function is comparatively single, does not realize the reference value calibration such as indicating value error and corresponding time error, ambient pressure error, accuse temperature error of flow when also carrying to the gas circuit.

Disclosure of Invention

The to-be-solved technical problem of the utility model lies in providing an atmospheric sampling ware automatic calibration system, can realize that sample thief flow range satisfies different instruments and testing environment's measurement demand at the no-load of 1ml/min ~ 1400L/min and the measurement of different on-load pressures.

The utility model discloses a realize like this: an automatic calibration system of an atmospheric sampler comprises a flowmeter device, a temperature sensor, a gas circuit pressure sensor, a data processing unit and a display unit, the flowmeter device, the temperature sensor, the gas circuit pressure sensor and the display unit are respectively electrically connected with the data processing unit, one end of the flow meter device is connected with the air inlet, the other end of the flow meter device is connected with the atmosphere sampler, the temperature sensor and the gas path pressure sensor are both arranged in the gas path between the flow meter device and the atmosphere sampler, the flow meter device comprises a first flow meter, a second flow meter, a third flow meter and a one-out-of-three electromagnetic valve, one end of each of the first flowmeter, the second flowmeter and the third flowmeter is respectively connected with an air inlet, the other ends of the first flowmeter, the second flowmeter and the third flowmeter are respectively connected with three air inlets of a three-out-of-one electromagnetic valve;

the air outlet of the one-of-three electromagnetic valve is connected with a first interface of the one-of-two electromagnetic valve, a second interface of the one-of-two electromagnetic valve is connected with one end of a pressure regulating valve, and the other end of the pressure regulating valve is respectively connected with an atmosphere sampler and a third interface of the one-of-two electromagnetic valve;

the pressure regulating valve, the two-out-of-one electromagnetic valve and the three-out-of-one electromagnetic valve are respectively and electrically connected with the data processing unit and are controlled by the data processing unit.

Furthermore, the system also comprises a communication unit, and the flow meter device and the data processing unit respectively perform data interaction with the upper computer through the communication unit.

Furthermore, the upper computer is an analysis detection device and is used for sampling, analyzing, displaying and storing the measurement data and generating a calibration certificate.

Further, the first flow meter is a soap film flow meter, the second flow meter is a roots meter, and the third flow meter is a differential pressure flow meter.

Furthermore, the system also comprises a timing unit, wherein the timing unit is connected with the data processing unit and is used for recording the acquisition time.

Further, the temperature sensor is a platinum resistor temperature sensor.

Furthermore, the system further comprises an environment temperature and humidity sensor and an environment atmospheric pressure sensor, wherein the environment temperature and humidity sensor and the environment atmospheric pressure sensor are respectively installed outside the air path and are electrically connected with the data processing unit.

The utility model has the advantages that: by arranging different flowmeters, pressure regulating valves and switching valves with different flow rates, the measurement of no-load and different loaded pressures of the sampler with the flow rate ranging from 1ml/min to 1400L/min can be met, and the detection requirement of wide flow in different environments is realized; the integrated calibration of parameters such as temperature, time, atmospheric pressure and the like can be simultaneously met; the analysis and storage of the measurement data, the generation of the calibration certificate and the like can be realized by connecting the upper computer.

Drawings

The invention will be further described with reference to the following examples with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a circuit connection structure of an automatic calibration system of an air sampler.

FIG. 2 is a gas path block diagram of an automatic calibration system for an atmospheric sampler.

Detailed Description

Referring to fig. 1 and 2, the present invention relates to an automatic calibration system 100 for an atmospheric sampling device, including a flow meter device 1, a temperature sensor 2, a gas circuit pressure sensor 3, a data processing unit 4 and a display unit 5, wherein the flow meter device 1, the temperature sensor 2, the gas circuit pressure sensor 3 and the display unit 5 are respectively electrically connected to the data processing unit 4, one end of the flow meter device 1 is connected to an air inlet 6, the other end is connected to an atmospheric sampling device 200, the temperature sensor 2 and the gas circuit pressure sensor 3 are both installed in a gas circuit between the flow meter device 1 and the atmospheric sampling device 200, the flow meter device 1 includes a first flow meter 7, a second flow meter 8, a third flow meter 9 and a one-out-of-three solenoid valve 10, one ends of the first flow meter 7, the second flow meter 8 and the third flow meter 9 are respectively connected to the air inlet 6, the other ends of the first flowmeter 7, the second flowmeter 8 and the third flowmeter 9 are respectively connected with three air inlets of a one-out-of-three electromagnetic valve 10;

the air outlet of the one-of-three electromagnetic valve 10 is connected with a first interface a of an one-of-two electromagnetic valve 11, a second interface b of the one-of-two electromagnetic valve 11 is connected with one end of a pressure regulating valve 12, and the other end of the pressure regulating valve 12 is respectively connected with an atmosphere sampler 200 and a third interface c of the one-of-three electromagnetic valve 11;

the pressure regulating valve 12, the one-out-of-two electromagnetic valve 11 and the one-out-of-three electromagnetic valve 10 are respectively electrically connected with the data processing unit 4 and controlled by the data processing unit 4.

Preferably, the system further comprises a communication unit 13, and the flowmeter device 1 and the data processing unit 4 respectively perform data interaction with the upper computer 14 through the communication unit 13.

Preferably, the upper computer 14 is an analysis and detection device, and is used for sampling, analyzing, displaying, storing measurement data and generating a calibration certificate.

Preferably, the first flow meter 7 is a soap film flow meter, the second flow meter 8 is a roots meter, and the third flow meter 9 is a differential pressure flow meter.

Preferably, the system further comprises a timing unit 15, and the timing unit 15 is connected with the data processing unit 4 and is used for recording the acquisition time.

Preferably, the temperature sensor 2 is a platinum resistance temperature sensor.

Preferably, the system further includes an ambient temperature and humidity sensor 16 and an ambient atmospheric pressure sensor 17, where the ambient temperature and humidity sensor 16 and the ambient atmospheric pressure sensor 17 are respectively installed outside the air path and electrically connected to the data processing unit 4.

The utility model discloses a theory of operation as follows:

the air inlet is selectively connected with different flowmeters according to the flow range and an air path switch signal, for example, when the flow range is 0L/min-30L/min, the air inlet is selectively communicated with a soap film flowmeter of a first flowmeter, when the flow range is 10L/min-200L/min, the air inlet is selectively communicated with a waist wheel flowmeter of a second flowmeter, and when the flow range is 100L/min-1400L/min, the air inlet is selectively communicated with a differential pressure flowmeter of a third flowmeter. The flowmeter to be used is connected into the gas circuit by controlling one of three electromagnetic valves;

adjusting the pressure regulating valve according to the use requirements (A, B, C or other on-load pressure requirements) of the instrument to enable the air path pressure to meet the detection requirements, closing the third interface C of the alternative electromagnetic valve at the moment, and opening the second interface B; if the resistance test is not needed, directly closing the pressure regulating valve, communicating the gas path by using a third interface c of the alternative electromagnetic valve, and closing the second interface b;

and measuring the flow after the instrument is stabilized, reading the working condition flow of the standard flowmeter, simultaneously recording the atmospheric environmental pressure and the temperature and humidity values of the experimental environment, and recording data such as an air pressure value, a temperature value and the like in the air circuit.

After data of each sensor collected by the data processing unit are analyzed, processed and stored, signals are sent to the display unit to be displayed on site, the data are sent to the upper computer through the communication unit to be further processed, the flow meter device enables the collected signals to pass through the communication unit upper computer, the upper computer can deduce an actual flow value, a standard flow value and an instant flow value of the flow through a gas state equation after collecting the flow, the ambient atmospheric pressure value, the temperature and the humidity of a gas circuit and the load pressure value of a sampling, and can further calculate parameters such as a flow indicating value error, flow repeatability, a timing error, an ambient temperature indicating value and an atmospheric pressure indicating value error of the atmospheric sampler, so that data analysis, display, storage and calibration certificate generation are realized.

The flowmeter is directly connected with the upper computer through a communication interface. The data is directly processed by an upper computer, the upper computer collects real-time flow values of the flow, and then different flow values (an actual flow value, a standard flow value and an instant flow value) are directly obtained through conversion, and the expression methods of the three flow values are required in JJG 956-2013 atmospheric sampling device.

The utility model discloses a set up different flowmeters and air-vent valve, can realize the atmospheric sampling ware automatic calibration of wide flow, can satisfy the flow range at the no-load of 1ml/min ~ 1400L/min and the measurement of different on-load pressures, and can satisfy the calibration of temperature, time, atmospheric pressure isoparametric simultaneously to through connecting host computer and next computer, can realize sampling, analysis, demonstration, storage and the certificate of calibration generation etc. of measured data.

Although specific embodiments of the present invention have been described, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the claims appended hereto.

Claims

1. The utility model provides an atmospheric sampling ware automatic calibration system, includes flowmeter device, temperature sensor, gas circuit pressure sensor, data processing unit and display element, flowmeter device, temperature sensor, gas circuit pressure sensor and display element are connected with the data processing unit electricity respectively, flowmeter device's one end is connected with the air inlet, and the other end is connected with the atmospheric sampling ware, temperature sensor, gas circuit pressure sensor all install in the gas circuit between flowmeter device and the atmospheric sampling ware, its characterized in that:

the flow meter device comprises a first flow meter, a second flow meter, a third flow meter and a one-out-of-three electromagnetic valve, wherein one end of the first flow meter, one end of the second flow meter and one end of the third flow meter are respectively connected with an air inlet, and the other end of the first flow meter, the other end of the second flow meter and the other end of the third flow meter are respectively connected with three air inlets of the one-out-of-three electromagnetic valve;

the air outlet of the one-out-of-three electromagnetic valve is connected with a first interface of the one-out-of-two electromagnetic valve, a second interface of the one-out-of-two electromagnetic valve is connected with one end of a pressure regulating valve, and the other end of the pressure regulating valve is respectively connected with an atmosphere sampler and a third interface of the one-out-of-two electromagnetic valve;

2. The automatic calibration system for an atmospheric sampler as recited in claim 1, wherein: the system further comprises a communication unit, and the flow meter device and the data processing unit are in data interaction with the upper computer through the communication unit respectively.

3. An automatic calibration system for an atmospheric sampler as defined in claim 2, wherein: the upper computer is analysis and detection equipment and is used for sampling, analyzing, displaying and storing the measurement data and generating a calibration certificate.

4. The automatic calibration system for an atmosphere sampler as claimed in claim 1, wherein: the first flow meter is a soap film flow meter, the second flow meter is a waist wheel flow meter, and the third flow meter is a differential pressure flow meter.

5. The automatic calibration system for an atmospheric sampler as recited in claim 1, wherein: the system also comprises a timing unit which is connected with the data processing unit and used for recording the acquisition time.

6. The automatic calibration system for an atmospheric sampler as recited in claim 1, wherein: the temperature sensor is a platinum resistor temperature sensor.

7. The automatic calibration system for an atmospheric sampler as recited in claim 1, wherein: the system further comprises an environment temperature and humidity sensor and an environment atmospheric pressure sensor, wherein the environment temperature and humidity sensor and the environment atmospheric pressure sensor are respectively installed outside the air path and are electrically connected with the data processing unit.