CN209559311U - A flow checking and calibrating device - Google Patents

Abstract

The utility model discloses a flow checking and calibrating device, which relates to the field of measuring instruments. The method is used to solve the time-consuming and labor-intensive problems of the mass flow meter inspection and calibration of the multi-gas dynamic calibrator in the prior art. The device includes: a multi-gas dynamic calibrator, a mass flow meter, an intelligent gas circuit conversion device and a plurality of standard flow meters with different ranges; the intelligent gas circuit conversion device includes a plurality of multi-gas dynamic calibrator output gas circuit solenoid valves, Multi-branch pipes and a plurality of standard flowmeter input gas circuit solenoid valves; the output end of the multi-gas dynamic calibrator is connected to the input end of at least one of the mass flowmeters; the output end of the mass flowmeter passes through the The output gas circuit solenoid valve of the multi-gas dynamic calibrator is connected to the multi-branch pipe; the multi-branch pipe is respectively connected to a plurality of standard flow meters of different ranges through a plurality of standard flowmeter input gas circuit solenoid valves connect.

Description

A flow checking and calibrating device

technical field

The utility model relates to the field of measuring instruments, in particular to a flow checking and calibrating device.

Background technique

According to the "Ambient Air Quality Standard" (GB 3095-2012), the routine indicators of the ambient air automatic monitoring station (hereinafter referred to as "air station") include gaseous pollutants (SO ₂ , NO ₂ , O ₃ and CO), particulate matter (PM ₁₀ and PM _2.5 ), which bears the responsibility of releasing the ambient air quality to the public in real time, and is equipped with gas analyzers such as SO ₂ , NO ₂ , O ₃ and CO, and Fig. 1 is the gas analyzer working gas provided in the prior art The schematic diagram of the road, the working gas path of the air station is shown in Figure 1. The working principle of the SO ₂ gas analyzer is based on the principle of pulsed ultraviolet fluorescence method. _The sample is irradiated with ultraviolet light with a wavelength of _190-230nm . SO ₂ absorbs the ultraviolet light and produces an energy level transition. Stable and return to the ground state and emit fluorescence with a central wavelength of 330nm, the resulting fluorescence intensity is proportional to the concentration of SO ₂ , and the concentration of SO ₂ can be obtained by measuring the fluorescence intensity with a photomultiplier tube and an electronic measurement system. The working principle of NO ₂ gas analyzer is based on the principle of chemiluminescence. NO and O ₃ chemically react to produce a unique luminescence. The intensity of this luminescence is linearly proportional to the concentration of NO. In the reaction chamber, O ₃ and O 3 _The NO in the sample reacts to produce excited NO2 molecules, and the photomultiplier tube detects the luminescence generated in this reaction to measure the NO gas concentration. The working principle of the CO gas analyzer is designed based on the characteristic absorption of CO to infrared radiation with a wavelength of 4.6um. The sample gas enters the analyzer through the sampling port. The sample gas is then passed through the optical bench. Infrared rays from an infrared light source pass sequentially through the CO and _N2 gas filters in the rotating filter wheel. Then the infrared radiation enters the reaction chamber (optical bench) through a band-pass (narrow-band) interference filter, and the infrared radiation is absorbed by the sample gas, and the infrared radiation emitted from the reaction chamber enters the infrared detector. The reference infrared radiation transmitted by the side of the CO gas filter cannot be further absorbed by CO in the reaction chamber. Infrared radiation transmitted from the _N2 filter side can be strongly absorbed by CO in the reaction chamber. The CO concentration can be obtained by detecting the infrared absorption amplitude related to the CO concentration in the reaction chamber and the alternately modulated infrared detection signal between the two gas filters, demodulating and amplifying it and sending it to a computer for processing. The working principle of the O ₃ analyzer is that O ₃ molecules absorb ultraviolet light with a wavelength of 254nm, and the intensity of ultraviolet light is directly related to the concentration of O ₃ . In the field of automatic air monitoring, quality control is not only one of the key tasks of online air quality monitoring, but also a powerful guarantee for data accuracy. The accuracy of monitoring data is closely related to quality control means (such as span check, precision check, multi-point linearity check, etc.). The accuracy of quality control methods such as span inspection and precision inspection depends on whether the gas flow rate of the multi-gas dynamic calibrator is accurate. In short, the accuracy of the gas distribution flow (built-in mass flow meter) of the multi-gas dynamic calibrator directly determines the accuracy of the monitoring data.

As an automatic monitoring device, the mass flowmeter of the multi-gas dynamic calibrator will be affected by factors such as vibration, electromagnetic interference, temperature change, pressure change, pipeline leakage and standard gas characteristics during operation. Calibration will cause a deviation in the ratio of the calibration gas, resulting in distortion of the monitoring data.

Regular inspection of the mass flow meters of the multi-gas dynamic calibrator is a prerequisite for stable and reliable operation of the air station. According to the requirements of "Technical Requirements and Detection Methods for Continuous Automatic Monitoring System of Ambient Air Gaseous Pollutants (SO ₂ , NO ₂ , O ₃ , CO)" (HJ 654-2013), the linearity error of the mass flowmeter of the multi-gas dynamic calibrator should be Within ±1%. To achieve this goal, technicians regularly check or calibrate the mass flow meters of multi-gas dynamic calibrators with standard flow meters on a quarterly basis. According to the standard operation manual of the instrument, before checking or calibrating the mass flowmeter of the multi-gas dynamic calibrator, the technician needs to use the zero gas generator as the gas source, and connect the standard flowmeter to the output gas port of the multi-gas dynamic calibrator, and then Manually operate the multi-gas dynamic calibrator, output a certain flow of gas through the standard flowmeter according to the checkpoints of 20%, 40%, 60%, and 80% of the full scale, and record the output values of the mass flowmeter in different ranges and the connection with it. The standard flowmeter measures the flow rate, and then calculates the calibration curve of the mass flow rate and the measured flow rate according to the least square method.

However, due to the large number of flow checkpoints, for checkpoints with different flow sizes, it is necessary to manually select the appropriate standard flowmeter and manually connect multiple gas paths between the mass flowmeter of the multi-gas dynamic calibrator and the standard flowmeter , see Figure 1 for details. As shown in Figure 1, each multi-gas dynamic calibrator has two built-in mass flowmeters with a range difference of 100 times, which are used to control the flow of standard gas and zero gas respectively. When performing flow calibration operations, each multi-gas dynamic calibrator needs to be matched with 2 standard flow meters with different ranges. When checking the flow rate, it is necessary to measure and check the standard flowmeter connected to C1-C8. When the mass flowmeter deviation of C1-C8 is found, manually perform flow calibration on the instrument operation panel. In addition, the standard flowmeter is easily affected by the surrounding environment and people during the measurement process, such as vibration, temperature and pressure changes, etc. When reading the flow value, it is necessary to wait for the reading to stabilize, especially at points with low flow rates. It is time-consuming and a waste of manpower and material resources when checking in place. Therefore, the development of a device and method for automatic checking and calibrating the flow rate of a multi-gas dynamic calibrator can not only reduce the difficulty of performing the flow calibration work, reduce measurement errors, but also greatly save manpower and material resources.

To sum up, there are time-consuming and labor-intensive problems in the inspection and calibration of the mass flowmeter of the multi-gas dynamic calibrator in the prior art.

Utility model content

The embodiment of the utility model provides a flow checking and calibrating device, which is used to solve the time-consuming and labor-intensive problems of checking and calibrating the mass flowmeter of a multi-gas dynamic calibrator in the prior art.

The embodiment of the utility model provides a flow checking and calibrating device, including:

Multi-gas dynamic calibrator, mass flowmeter, intelligent gas path conversion device and multiple standard flowmeters with different ranges;

The intelligent gas circuit conversion device includes multiple multi-gas dynamic calibrator output gas circuit solenoid valves, multi-branch pipes and multiple standard flowmeter input gas circuit solenoid valves;

The output end of the multi-gas dynamic calibrator is connected to the input end of at least one of the mass flow meters;

The output end of the mass flowmeter is connected to the multi-branch pipe through the output gas circuit solenoid valve of the multi-gas dynamic calibrator;

The multi-branch pipe is respectively connected to a plurality of standard flowmeters of different ranges through a plurality of electromagnetic valves of the standard flowmeter input air circuit.

Preferably, a zero gas source is also included;

The output end of the zero gas source is connected to the input end of the multi-gas dynamic calibrator.

Preferably, it also includes an industrial computer;

The output ends of the plurality of standard flowmeters are connected with the input ends of the industrial computer.

Preferably, the intelligent air path conversion device also includes a cooling fan, a display screen and a power supply;

A plurality of the multi-gas dynamic calibrator output gas path solenoid valves and a plurality of the standard flowmeter input gas path solenoid valves are respectively electrically connected to the power supply;

The display screen is arranged on the outside of the intelligent gas circuit conversion device, and is electrically connected to a plurality of output gas circuit solenoid valves of the multi-gas dynamic calibrator and a plurality of the standard flowmeter input gas circuit solenoid valves;

The heat dissipation fan is arranged inside the intelligent air circuit conversion device and is electrically connected with the power supply.

Preferably, the standard flowmeter is a piston flowmeter.

The embodiment of the utility model provides a flow checking and calibrating device, which includes: a multi-gas dynamic calibrator, a mass flow meter, an intelligent gas circuit conversion device and a plurality of standard flow meters with different ranges; the intelligent gas circuit conversion device It includes multiple multi-gas dynamic calibrator output gas circuit solenoid valves, multi-branch pipes and multiple standard flowmeter input gas circuit solenoid valves; the output end of the multi-gas dynamic calibrator is connected to the input of at least one mass flow meter The output end of the mass flowmeter is connected to the multi-branch pipe through the output gas circuit solenoid valve of the multi-gas dynamic calibrator; the multi-branch pipe is input into the gas circuit through a plurality of the standard flowmeters The solenoid valves are respectively connected with a plurality of standard flowmeters with different ranges. The multi-branch tube included in the intelligent gas circuit conversion device in the device can realize the connection between multiple multi-gas dynamic calibrators and multiple standard flowmeters with different ranges. Furthermore, the output gas circuit solenoid valve of the multi-gas dynamic calibrators can control different The switch of the output gas path of the multi-gas dynamic calibrator, the solenoid valve of the standard flowmeter input gas path can control the switch of the gas path of the standard flowmeter in different ranges; further, the intelligent gas path conversion device is connected with the multi-gas dynamic calibrator respectively, The connection between the mass flowmeter and the standard flowmeter realizes the connection between the output port of the standard flowmeter and the multi-gas dynamic calibrator. Through the data acquisition and control software, the intelligent gas path conversion device, standard flowmeter and multi-gas dynamic calibration can be performed. The instrument is intelligently controlled, so that the inspection and calibration of the mass flow meter of the multi-gas dynamic calibrator can be completed.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the gaseous analyzer working gas path schematic diagram that prior art provides;

Fig. 2 is a schematic diagram of the working gas path of the intelligent gas path conversion device provided by the embodiment of the present invention;

Fig. 3 is a schematic diagram of the internal structure of the intelligent gas circuit switching device provided by the embodiment of the present invention;

Fig. 4 is a schematic flowchart of a flow checking and calibrating method provided by an embodiment of the present invention.

In the figure, A is zero gas source, B1~B4 are multi-gas dynamic calibrator, C1~C8 are standard mass flowmeters, F1~F3 are standard flowmeters with different ranges, D is intelligent gas circuit conversion device, E is multi-branch Line pipes, 1 to 4 are multi-gas dynamic calibrator output gas circuit solenoid valves, 5 to 7 are standard flowmeter input gas circuit solenoid valves, H is a display screen, I is a cooling fan, and J is a power supply.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Fig. 2 is a schematic diagram of the working gas path of the intelligent gas path switching device provided by the embodiment of the utility model, and Fig. 3 is a schematic diagram of the internal structure of the smart gas path switching device provided by the embodiment of the utility model. As shown in Figure 2 and Figure 3, a flow inspection and calibration device provided by the embodiment of the utility model mainly includes a multi-gas dynamic calibrator, a mass flow meter, an intelligent gas path conversion device and a plurality of standard flow rates with different ranges count.

Specifically, as shown in FIG. 2 , the intelligent gas circuit switching device includes a plurality of multi-gas dynamic calibrator output gas circuit solenoid valves, multi-branch pipes and multiple standard flowmeter input gas circuit solenoid valves.

In practical applications, since the intelligent gas circuit conversion device includes multiple multi-gas dynamic calibrator output gas circuit solenoid valves, multiple standard flowmeter input gas circuit solenoid valves and multi-branch pipes, multiple multi-gas The input ends of the solenoid valves of the output gas path of the dynamic calibrator are respectively connected to multiple gas dynamic calibrators, and further, the solenoid valves of the input gas path of multiple standard flowmeters are respectively connected to multiple standard flowmeters with different ranges. It should be noted that, in the embodiment of the present utility model, a mass flow meter is also connected between the gas dynamic calibrator and the output gas circuit solenoid valve of the multi-gas dynamic calibrator. Preferably, a gas dynamic calibrator and a multi-gas calibrator Two mass flow meters are respectively connected between the solenoid valves of the output gas path of the dynamic calibrator.

As shown in Figure 2 and Figure 3, the flow inspection and calibration device provided by the embodiment of the utility model, because the intelligent gas circuit conversion device includes 4 multi-gas dynamic calibrator output gas circuit solenoid valves, 3 standard flowmeter input The gas path solenoid valve, correspondingly, the gas dynamic calibrator connected with the output gas path solenoid valve of the multi-gas dynamic calibrator also includes 4 pieces, and is arranged on each gas dynamic calibrator and each gas dynamic calibrator output gas path There are 2 mass flowmeters between the solenoid valves; 3 standard flowmeters with different ranges are connected to the standard flowmeter input gas circuit solenoid valve.

It should be noted that in practical applications, standard flowmeters with different ranges can be 0-100mL, 0-5000mL and 0-30000mL respectively. In the embodiment of the utility model, the specific ranges of standard flowmeters with different ranges are not limited. .

As shown in Figure 2, the flow inspection and calibration device provided by the embodiment of the utility model also includes a zero gas source and an industrial computer, specifically, the output end of the zero gas source is respectively connected to the input end of each multi-gas dynamic calibrator , correspondingly, the output ends of the plurality of standard flowmeters respectively establish communication connections with the input ends of the industrial computer.

As shown in Figure 3, the intelligent gas path conversion device also includes a cooling fan, a display screen and a power supply; specifically, each multi-gas dynamic calibrator output gas path solenoid valve and each standard flowmeter input gas path solenoid valve are respectively connected to the power supply Electrically connected; the cooling fan is set inside the intelligent gas circuit conversion device for cooling the inside of the intelligent gas circuit conversion device, and the cooling fan is electrically connected to the power supply; further, the display screen is set outside the intelligent gas circuit conversion device, It is electrically connected with each multi-gas dynamic calibrator output gas path solenoid valve and each standard flowmeter input gas path solenoid valve, and is used to display the opening or closing of each multi-gas dynamic calibrator output gas path solenoid valve, and to use It is used to display the opening or closing of the solenoid valve of the input gas path of each standard flow meter.

A flow checking and calibrating device provided by the embodiment of the utility model, the multi-branch pipe included in the intelligent gas circuit conversion device in the device can realize the connection between multiple multi-gas dynamic calibrators and multiple standard flowmeters with different ranges, and then Or, the multi-gas dynamic calibrator output gas path solenoid valve can control the switch of the output gas path of different multi-gas dynamic calibrator, and the standard flowmeter input gas path solenoid valve can control the switch of the standard flowmeter gas path in different ranges; further , connect the intelligent gas circuit switching device with the multi-gas dynamic calibrator, mass flow meter and standard flow meter respectively, and realize the connection between the standard flow meter and the output port of the multi-gas dynamic calibrator. Through data acquisition and control software, it can Intelligently control the intelligent gas path conversion device, standard flowmeter and multi-gas dynamic calibrator, so that the inspection and calibration of the mass flowmeter of the multi-gas dynamic calibrator can be completed. In practical application, it not only effectively reduces the execution difficulty of flow inspection and calibration work, reduces measurement errors, but also greatly saves manpower and material resources. It is especially suitable for the daily operation and maintenance process of multi-gas dynamic calibrator. Furthermore, the equipment and accessories used in the intelligent air path conversion device are easy to process and install.

In order to more clearly introduce a flow checking and calibrating device provided by the embodiment of the present utility model, the specific usage method of the flow checking and calibrating device is further introduced in detail in conjunction with the flow chart of a flow checking and calibrating method provided in Figure 4 below:

As shown in Figure 4, the method mainly includes the following steps:

Step 101, sequentially open the multi-gas dynamic calibrator connected to the mass flowmeter to be checked and calibrated, the output gas path solenoid valve of the multi-gas dynamic calibrator and the standard flowmeter input gas path solenoid valve;

Step 102, according to the size of the flow check point, select a standard flow meter that matches the flow check point from a plurality of standard flow meters with different ranges, and connect the input end of the standard flow meter to the input port of the standard flow meter. Air solenoid valve connection;

Step 103, when the multi-gas dynamic calibrator generates the flow rate of the first check point to be checked, sequentially read the first flow rate and the second flow rate generated by the mass flow meter and the standard flow meter;

Step 104, if the deviation value determined by the first flow rate and the second flow rate exceeds a set range, calibrate the first flow rate output by the multi-gas dynamic calibrator.

It should be noted that the basic working mode of the flow inspection and calibration device provided by the embodiment of the present invention is as follows: first connect the zero gas source, and install an intelligent gas path conversion device on the inspection gas path of the multi-gas dynamic calibrator to realize the standard flow rate The meter is connected to the output gas port of the multi-gas dynamic calibrator, and then through the data acquisition and control software, the intelligent gas path conversion device, the standard flow meter and the multi-gas dynamic calibrator are intelligently controlled. The calibration command completes the calibration of the mass flow meter of the multi-gas dynamic calibrator.

As shown in Figure 2, the multi-gas dynamic calibrator provided by the embodiment of the utility model includes 4, the mass flow meter includes 8, the multi-gas dynamic calibrator output gas circuit solenoid valve includes 4, and the standard flowmeter input There are 3 pneumatic solenoid valves, and 3 standard flowmeters with different ranges. The above method is only aimed at a certain multi-gas dynamic calibrator, the mass flowmeter connected in sequence with the multi-gas dynamic calibrator, the multi-gas dynamic calibrator output gas path solenoid valve, the standard flowmeter input gas path solenoid valve and the standard flowmeter as an example.

In step 101, select a certain multi-gas dynamic calibrator and mass flow meter from Fig. 2, and determine the selected mass flow meter as the mass flow meter to be checked and calibrated. Turn on the multi-gas dynamic calibrator connected to the mass flowmeter in sequence, the output gas path solenoid valve of the multi-gas dynamic calibrator and the standard flowmeter input gas path solenoid valve. For example, as shown in Figure 2, an instruction to perform flow inspection and calibration is sent through an industrial computer, so that the output gas path solenoid valve of the multi-gas dynamic calibrator matched with the mass flowmeter to be checked and calibrated, the standard flowmeter input gas Solenoid valves are opened sequentially.

It should be noted that in practical applications, since the standard flowmeter input gas circuit solenoid valves are respectively connected to standard flowmeters with different ranges, when selecting the standard flowmeter input gas circuit solenoid valve, it is necessary to The size of the flow check point determines which standard flowmeter to choose, and then determines the standard flowmeter to be selected according to the selected standard flowmeter to input the gas circuit solenoid valve.

In the prior art, the piston flowmeter is the most common standard flowmeter in the automatic monitoring of air quality at present. Due to the characteristics of different time required for different flow measurements, it is easy to automatically obtain the measured value of the piston flowmeter. There are difficulties. In the embodiment of the utility model, since the measuring ranges of the standard flowmeters commonly used in air stations are 0-100mL, 0-5000mL and 0-30000mL, taking the piston flowmeter as an example, the corresponding cylinder capacities are 10mL and 50mL respectively and 100mL, when the flow is automatically checked and calibrated, there are several fixed flow check points. That is, the time for the piston to reciprocate once in the cylinder can be determined by the following formula (1):

Tr＝2X/Y formula (1)

Among them, X is the capacity of the cylinder, Y is the size of the flow check point, and the time for the Tr piston to reciprocate once in the cylinder.

Further, after determining the time for the piston to reciprocate once in the cylinder, the constant C time after the piston reciprocates once in the cylinder can also be determined as 1s, and the C time is the output flow data after the piston reciprocates once in the cylinder time. That is, the time when the flow data of the flowmeter is generated can be determined by formula (2):

Tc=Tr+C formula (2)

Among them, C is a constant, and Tc is the time when the standard flowmeter generates flow data.

It should be noted that, in the embodiment of the present invention, the time for the data acquisition software to read the flow data instruction is equivalent to the time when the flow meter flow data is generated, that is, the formula (2) can also be expressed as follows:

Ts=Tc=Tr+C formula (3)

Among them, Ts is the time for the data acquisition software to read the flow data instruction, and Tc is the time for the standard flowmeter to generate the flow data.

Through the above formula (1), it is possible to rotate a standard flowmeter that matches the flow check point from standard flowmeters with multiple different ranges, and then connect the input end of the standard flowmeter to the standard flowmeter input air circuit solenoid valve.

In the embodiment of the present invention, when the multi-gas dynamic calibrator generates the flow rate of the first check point to be checked, the first flow rate can be obtained from the mass flow meter, and then the second flow rate can be obtained through the standard flow meter. Further, the deviation between the first flow rate and the second flow rate can be determined by the following formula (4):

ΔL=(La-Ls)/Ls×100% formula (4)

Wherein, La is the first flow rate, Ls is the second flow rate, and ΔL is the deviation value.

Further, after determining the deviation between the first flow rate and the second flow rate, it is necessary to determine whether to carry out the next flow checking process or to calibrate the mass flow meter to be checked according to the relationship between the deviation value and the set value.

Specifically, when it is determined that the deviation between the first flow rate and the second flow rate exceeds the set value, as shown in Figure 2, it is necessary to output an instruction from the industrial computer to perform the first flow rate output by the mass flowmeter of the multi-gas dynamic calibrator. Flow calibration, wait until after the calibration, before proceeding to the next flow inspection process.

The usage method of the device provided by the embodiment of the utility model can intelligently match a suitable standard flowmeter according to the size of the flow check point, and connect the mass flowmeter to be tested of the multi-gas dynamic calibrator to the standard flowmeter. Since the device has multiple channels, it can also complete the intelligent flow checking and calibration of multiple multi-gas dynamic calibrators.

Taking Figure 2 as an example, the method for flow checking and calibration of mass flow meters of multiple multi-gas dynamic calibrators is further described:

Take the flow checking and calibration of the mass flow meter C1 of the multi-gas dynamic calibrator B1 as an example.

①Send flow inspection and calibration instructions through the industrial computer G, so that the solenoid valve 1 of the output gas path matching the mass flowmeter to be inspected and calibrated, and the solenoid valve 1 of the standard flowmeter input gas path are opened in sequence; among them, the input gas path of the standard flowmeter Gas circuit solenoid valve 5 is one of standard flow meter input gas circuit solenoid valve 6 and standard flow meter input gas circuit solenoid valve 7, and the input gas circuit is opened or closed according to the size of the flow check point.

② The multi-gas dynamic calibrator B1 to be tested is connected to the gas path of the standard flowmeter to be used, among which, one of the standard flowmeter F1, standard flowmeter F2 and standard flowmeter F3 is selected according to the size of the flow check point. Select a standard flow meter suitable for the measuring range.

③Send an instruction to generate flow data to the multi-gas dynamic calibrator B1, so that it can generate the first checkpoint flow that needs to be checked;

④ The industrial computer reads the mass flow rate La output by the mass flowmeter C1 and the standard flow rate Ls output by the standard flowmeter from the multi-gas dynamic calibrator B1, and determines the deviation between the two through the following formula. Calculate the relative deviation between the values of La and Ls:

ΔL=(La-Ls)/Ls×100%.

If ΔL does not exceed the allowable flow range, enter the next flow inspection process; when ΔL exceeds the allowable range, perform flow calibration on the output flow La of B1 through the output command of the industrial computer, and enter the next flow inspection process after calibration.

⑤ Repeat step ④ until all flow checkpoints are checked and calibrated;

⑥Send the task completion command through the industrial computer, so that the output gas path solenoid valve and the input gas path solenoid valve matching the mass flow meter C1 to be checked and calibrated are closed in sequence;

If it is necessary to check and calibrate the mass flowmeter C2 of the multi-gas dynamic calibrator B1, repeat steps ①～⑥; ) to check and calibrate the flow rate, just repeat steps ①～⑥.

To sum up, the embodiment of the utility model provides a flow checking and calibrating device. The multi-branch tubes included in the intelligent gas circuit conversion device in the device can realize multiple multi-gas dynamic calibrators and multiple standard flowmeters with different ranges. Moreover, the multi-gas dynamic calibrator output gas path solenoid valve can control the switch of different multi-gas dynamic calibrator output gas paths, and the standard flowmeter input gas path solenoid valve can control the standard flowmeter gas path of different ranges. switch; further, the intelligent gas circuit conversion device is connected with the multi-gas dynamic calibrator, mass flow meter and standard flow meter respectively, and the output device port connection of the standard flow meter and the multi-gas dynamic calibrator is realized, through data acquisition and The control software can intelligently control the intelligent gas path conversion device, standard flowmeter and multi-gas dynamic calibrator, so as to complete the inspection and calibration of the mass flowmeter of the multi-gas dynamic calibrator. Furthermore, in practical application, it not only effectively reduces the execution difficulty of flow inspection and calibration work, reduces measurement errors, but also greatly saves manpower and material resources, and is especially suitable for the daily operation and maintenance process of multi-gas dynamic calibrator. Furthermore, the equipment and accessories used in the intelligent air path conversion device are easy to process and install.

While preferred embodiments of the present invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, the appended claims are intended to be interpreted to cover the preferred embodiment and all changes and modifications which fall within the scope of the present invention.

Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and equivalent technologies thereof, the utility model is also intended to include these modifications and variations.

Claims (5)

1. A flow inspection and calibration device, characterized in that it comprises: Multi-gas dynamic calibrator, mass flowmeter, intelligent gas path conversion device and multiple standard flowmeters with different ranges; The intelligent gas circuit conversion device includes multiple multi-gas dynamic calibrator output gas circuit solenoid valves, multi-branch pipes and multiple standard flowmeter input gas circuit solenoid valves; The output end of the multi-gas dynamic calibrator is connected to the input end of at least one of the mass flow meters; The output end of the mass flowmeter is connected to the multi-branch pipe through the output gas circuit solenoid valve of the multi-gas dynamic calibrator; The multi-branch pipe is respectively connected to a plurality of standard flowmeters of different ranges through a plurality of electromagnetic valves of the standard flowmeter input air path. 2. The calibration device according to claim 1, further comprising a zero gas source; The output end of the zero gas source is connected to the input end of the multi-gas dynamic calibrator. 3. The calibration device according to claim 1, further comprising an industrial computer; The output ends of the plurality of standard flowmeters are connected with the input ends of the industrial computer. 4. The calibration device according to claim 1, characterized in that, the intelligent gas circuit conversion device also includes a cooling fan, a display screen and a power supply; A plurality of the multi-gas dynamic calibrator output gas path solenoid valves and a plurality of the standard flowmeter input gas path solenoid valves are respectively electrically connected to the power supply; The display screen is arranged on the outside of the intelligent gas circuit conversion device, and is electrically connected to a plurality of output gas circuit solenoid valves of the multi-gas dynamic calibrator and a plurality of the standard flowmeter input gas circuit solenoid valves; The heat dissipation fan is arranged inside the intelligent air circuit conversion device and is electrically connected with the power supply. 5. The calibration device according to claim 1, wherein the standard flowmeter is a piston flowmeter.