Gas cylinder intelligent weighing system for intelligent preparation of standard gas

Abstract

The invention relates to the field of automatic preparation of standard gas, and discloses an intelligent gas cylinder weighing system for intelligent preparation of standard gas, which comprises a plurality of component gas cylinders used for containing each component gas and provided with a manual valve, a filter and a pneumatic valve I which are connected in series through a pipeline in sequence; the station gas cylinder is used for containing corresponding component gas, a cylinder valve, a flow sensor, a throttling valve and a pressure sensor which are connected in series through a pipeline are sequentially installed on the station gas cylinder, and the flow sensor is used for reading the gas flow rate and further weighing the filled component gas. The flow sensor is arranged behind the throttling valve, the flow sensor can detect the flow speed and flow of gas, the filling process of component gas is controlled according to the data, and the pneumatic valve is closed in advance before the filling amount of the component gas reaches the standard value, so that the final actual filling amount just reaches the standard value; the problem that the filling amount cannot be accurately controlled in an existing gas distribution technological process is solved, and the gas distribution precision is improved.

Description

Technical Field

[0001] The invention relates to the field of automated preparation of standard gas, and in particular to an intelligent weighing system for gas cylinders used for intelligent preparation of standard gas. Background Art

[0002] There are already thousands of types of standard gases. In the past, they were all manually configured according to GB / T 5274.1-2018 "Preparation of mixed gases for gas analysis calibration Part 1: Preparation of primary mixed gases by weighing method". Usually, multiple gases are weighed and mixed in a certain proportion. Multiple gases need to be filled in a certain proportion and sequence. This filling process is called "gas matching", and the gas filled is called component gas. The current gas matching process is: when the filling amount of component gas in the gas cylinder reaches the standard value, the air inlet valve is immediately closed. However, the air inlet valve in the charging circuit cannot be completely close to the gas cylinder being filled. According to the current process flow, the gas in the pipeline between the valve and the gas cylinder will be filled into the gas cylinder, resulting in the filling amount cannot be accurately controlled. The traditional manual configuration method has the problems of safety risks, low configuration efficiency, and poor control of configuration accuracy. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides an intelligent weighing system for gas cylinders for the intelligent preparation of standard gas, which solves the problem in the prior art that the air inlet valve in the charging circuit and the gas cylinder to be filled cannot be completely close together. According to the current process flow, the gas in the pipeline between the valve and the gas cylinder will be filled into the gas cylinder, resulting in the filling amount cannot be accurately controlled.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: an intelligent weighing system for gas cylinders for intelligent preparation of standard gas, comprising:

[0005] A plurality of component gas cylinders, used to contain each component gas, on which a manual valve, a filter and a pneumatic valve connected in series through pipelines are sequentially installed;

[0006] The workstation gas cylinder is used to contain the corresponding component gas, on which a cylinder valve, a flow sensor, a throttle valve and a pressure sensor connected in series through a pipeline are sequentially installed. The flow sensor is used to read the gas flow rate and then weigh the filled component gas;

[0007] The air path channel is used to provide a channel for weighing and transporting the component gases. The middle section of the air path channel is connected to the output ends of the multiple pneumatic valves. The right branch of the air path channel is connected in series with the pneumatic valve 2 and the safety valve 1 in sequence. The pipeline section between the pneumatic valve 2 and the safety valve 1 is installed with a vacuum gauge sensor for monitoring the vacuum degree inside the pipeline.

[0008] Preferably, the right end of the gas path is connected to the series pipeline on the workstation gas cylinder, and the component gases pass through the pressure sensor, the throttle valve, the flow sensor and the bottle valve in sequence to enter the interior of the workstation gas cylinder.

[0009] Preferably, a parallel branch is provided on the left side of the gas path, and the other end of the parallel branch is connected to a one-way valve, and the other end of the one-way valve is connected to the exhaust gas pool for collecting exhaust gas in the system pipeline.

[0010] Preferably, a pneumatic valve three and a vacuum pump are sequentially connected in series on the right side branch of the parallel branch.

[0011] Preferably, a second safety valve is installed on the left branch of the parallel branch.

[0012] Preferably, a pneumatic valve four is installed on the middle part of the parallel branch.

[0013] Preferably, the safety valve 1, the one-way valve and the parallel branch are interconnected.

[0014] Preferably, the intelligent weighing system also includes an industrial computer, and the industrial computer and the pressure sensor are electrically connected to transmit the detected air pressure information, the industrial computer and the flow sensor are electrically connected to transmit the detected component gas flow information, and the industrial computer and the vacuum gauge sensor are electrically connected to transmit the detected vacuum degree inside the gas path.

[0015] Preferably, the industrial computer and the pneumatic valve 1, the bottle valve, the pneumatic valve 2, the pneumatic valve 3, the pneumatic valve 4, and the vacuum pump are electrically connected.

[0016] Working principle: When filling component gases, open the pneumatic valve 1 and manual valve on the corresponding component gas cylinder. The component gases in the project will pass through the pipeline and filter into the gas path. At this time, pneumatic valve 2, pneumatic valve 4 and pneumatic valve 3 are in a closed state. Open the bottle valve again, and the component gases in the gas path will pass through the pressure sensor, throttle valve and flow sensor into the workstation gas cylinder. During the process, the real-time flow rate and flow of the component gases are detected by the flow sensor, and the volume of the filled component gases is measured. Then, the quality of the filled component gases is obtained according to the density of the component gases, and the total amount of the filled component gases is accurately controlled.

[0017] The input of the gas path is multiple component gas cylinders, which are respectively connected to the corresponding filters, manual valves and pneumatic valve 1, and then merged into the main loop gas path. A safety valve 2 is arranged on the left parallel branch of the main loop. When the pressure value in the main loop reaches the set upper limit, the safety valve 2 automatically opens and releases pressure. A pneumatic valve 4 is arranged on the middle branch of the parallel branch. When the pressure value in the main loop reaches the set upper limit, the pneumatic valve 4 automatically opens and releases pressure under the control of the industrial computer as another safety protection. A pneumatic valve 3 is arranged on the right branch of the parallel branch, and a vacuum pump is placed behind the pneumatic valve 3. A pneumatic valve 2 is arranged on the right branch of the main branch, and a vacuum gauge sensor is installed behind the pneumatic valve 2, and a safety valve 1 is installed behind the vacuum gauge sensor. The parallel branch and the right branch merge into the exhaust gas outlet circuit. A one-way valve is installed on this circuit. The exhausted exhaust gas enters the exhaust gas pool through the one-way valve. The one-way valve can prevent the exhaust gas in the exhaust gas pool from entering the gas filling circuit. The main circuit gas channel is also equipped with a pressure sensor and a throttle valve. The throttle valve is connected through a hose and then connected to a quick-connect plug. The manual valve is normally open. When the system is abnormal and the automatic valve cannot be closed, the valve can be closed manually to prevent accidents. When a certain component gas is filled into the workstation gas cylinder, the pneumatic valve corresponding to the circuit where the component gas is located in the gas distribution gas circuit is opened, and the other pneumatic valves are closed. The bottle valve is opened, and the component gas enters the gas cylinder through the pressure sensor and the throttle valve. The pressure data of the pressure sensor can reflect whether the circuit is being inflated and whether there is leakage in the circuit. The throttle valve can adjust the gas flow rate to facilitate the control of the gas filling amount. When the filling of component gas is finished and another component gas needs to be filled, first open pneumatic valve three and pneumatic valve four, close all other valves, start the vacuum pump, extract the residual component gas in the gas path, and monitor the exhaust situation by the vacuum gauge sensor at the same time. After the vacuum degree reaches the set value, close the vacuum pump, pneumatic valve three and pneumatic valve four, and then start to fill the next component gas;

[0018] A flow sensor is installed behind the throttle valve. The flow sensor can detect the flow rate and flow rate of the gas, and use this data to control the filling process of the component gas. Before the filling volume of the component gas reaches the standard value, the bottle valve is closed in advance so that the final actual filling volume just reaches the standard value, ensuring the gas distribution accuracy.

[0019] The present invention provides an intelligent weighing system for gas cylinders used for intelligent preparation of standard gas. It has the following beneficial effects:

[0020] 1. The present invention arranges a flow sensor behind the throttle valve. The flow sensor can detect the flow rate and flow rate of the gas, and uses this data to control the filling process of the component gases. Before the filling amount of the component gases reaches the standard value, the air inlet valve is closed in advance, so that the final actual filling amount just reaches the standard value, which solves the problem that the filling amount cannot be accurately controlled in the current gas distribution process and improves the gas distribution accuracy.

[0021] 2. The present invention uses an industrial computer to realize that the system will automatically give a safe concentration and a safe component gas mixing plan, avoiding safety hazards such as local combustion and gas cylinder explosion caused by human operating errors, effectively improving the safety of the gas cylinder intelligent weighing system, and making the operation more convenient.

[0022] 3. The present invention opens pneumatic valve three and pneumatic valve four, closes all other valves, starts the vacuum pump, extracts the residual component gas in the gas path, and monitors the exhaust condition by the vacuum gauge sensor at the same time. After the vacuum degree reaches the set value, the vacuum pump, pneumatic valve three and pneumatic valve four are closed, and then the next component gas is filled to ensure that there is no residual component gas in the pipeline, so that during the operation of the gas cylinder intelligent weighing system, the weighing accuracy will not be reduced due to the influence of the residual gas in the pipeline, thereby further improving the weighing accuracy of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a system architecture diagram of the present invention.

[0025] Among them, 1. component gas cylinder; 2. manual valve; 3. filter; 4. pneumatic valve one; 5. gas path; 6. work station gas cylinder; 7. bottle valve; 8. flow sensor; 9. throttle valve; 10. pressure sensor; 11. pneumatic valve two; 12. vacuum gauge sensor; 13. safety valve one; 14. pneumatic valve three; 15. vacuum pump; 16. one-way valve; 17. pneumatic valve four; 18. safety valve two. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example:

[0028] Please see attached Figure 1 - Attachment Figure 2 The embodiment of the present invention provides an intelligent weighing system for gas cylinders for intelligent preparation of standard gas, comprising:

[0029] A plurality of component gas cylinders 1 are used to contain each component gas, and a manual valve 2, a filter 3 and a pneumatic valve 4 connected in series through a pipeline are sequentially installed thereon. The component gas ash inside the component gas cylinder 1 passes through the manual valve 2, the filter 3 and the pneumatic valve 4 in sequence to enter the filling and weighing system, and at the same time, after being filtered by the filter 3, it is ensured that no impurities remain inside the component gas;

[0030] The workstation gas cylinder 6 is used to contain the corresponding component gas, and is sequentially installed with a bottle valve 7, a flow sensor 8, a throttle valve 9 and a pressure sensor 10 connected in series through a pipeline. The flow sensor 8 is used to read the gas flow rate and then weigh the filled component gas. When a certain component gas is filled into the workstation gas cylinder 6, the pneumatic valve 14 corresponding to the circuit where the component gas is located in the gas distribution gas circuit is opened, and other pneumatic valves 14 are closed. The bottle valve 7 is opened, and the component gas enters the gas cylinder through the pressure sensor 10 and the throttle valve 9. The pressure data of the pressure sensor 10 can reflect whether the circuit is being inflated and whether there is leakage in the circuit. The throttle valve 9 can adjust the gas flow rate, which is convenient for controlling the amount of gas charged;

[0031] The gas channel 5 is used to provide a channel for weighing and conveying the component gases. The middle section of the gas channel 5 is connected to the output ends of multiple pneumatic valves 4. The right branch of the gas channel 5 is connected in series with pneumatic valves 11 and safety valves 13 in sequence. The pipeline between the pneumatic valves 11 and the safety valves 13 is equipped with a vacuum gauge sensor 12 for monitoring the vacuum degree inside the pipeline. The vacuum gauge sensor 12 monitors the exhaust condition. When the vacuum degree in the pipeline reaches the set value, the entire pipeline is in a vacuum state, and there is no residual component gas, which ensures the stability of the subsequent component gas refilling process.

[0032] The right end of the gas path channel 5 is connected to the series pipeline on the workstation gas cylinder 6, and the component gas passes through the pressure sensor 10, the throttle valve 9, the flow sensor 8 and the bottle valve 7 in sequence to enter the interior of the workstation gas cylinder 6. Open the pneumatic valve 1 4 and the manual valve 2 on the corresponding component gas cylinder 1, and the component gas in the project will pass through the pipeline and the filter 3 to enter the interior of the gas path channel 5. At this time, the pneumatic valve 2 11, the pneumatic valve 4 17 and the pneumatic valve 3 14 are in a closed state. Open the bottle valve 7 again, and the component gas inside the gas path channel 5 will pass through the pressure sensor 10, the throttle valve 9 and the flow sensor 8 to enter the interior of the workstation gas cylinder 6. During the process, the real-time flow rate and flow rate of the component gas are detected by the flow sensor 8, and the volume of the filled component gas is measured. Then, the quality of the filled component gas is obtained according to the density of the component gas, and the total amount of the component gas filled is accurately controlled.

[0033] A parallel branch is provided on the left side of the gas path 5, and the other end of the parallel branch is connected to a one-way valve 16. The other end of the one-way valve 16 is connected to the exhaust gas pool for collecting the exhaust gas in the system pipeline. The residual component gas in the pipeline passes through the one-way valve 16 and then enters the exhaust gas pool for collection to prevent the exhaust gas from leaking.

[0034] The right branch of the parallel branch is connected in series with a pneumatic valve 3 14 and a vacuum pump 15. When the component gas filling is completed and another component gas needs to be filled, the pneumatic valve 3 14 and the pneumatic valve 4 17 are first opened, and all other valves are closed. The vacuum pump 15 is turned on to extract the residual component gas in the gas path 5.

[0035] A safety valve 18 is installed on the left side of the parallel branch. When the pressure value in the main circuit reaches the set upper limit, the safety valve 18 automatically opens and releases pressure to ensure the safety of system operation.

[0036] A pneumatic valve 4 17 is installed on the middle part of the parallel branch. When the pressure value in the main circuit reaches the set upper limit, the pneumatic valve 4 17 automatically opens and releases pressure under the control of the industrial computer as another safety protection.

[0037] The safety valve 13, the one-way valve 16 and the parallel branch are interconnected, so that the vacuum pump 15 can transport the residual component gas in the pipeline and pass through the one-way valve 16 into the waste gas pool when it is started.

[0038] The intelligent weighing system also includes an industrial computer, which is electrically connected to the pressure sensor 10 for transmitting the detected air pressure information, the industrial computer and the flow sensor 8 for transmitting the detected component gas flow information, and the industrial computer and the vacuum gauge sensor 12 for transmitting the detected vacuum degree inside the gas path 5. The industrial computer is electrically connected to the pneumatic valve 1 4, the bottle valve 7, the pneumatic valve 2 11, the pneumatic valve 3 14, the pneumatic valve 4 17, and the vacuum pump 15. The pneumatic valves and 15 on the pipeline are automatically opened or closed by the industrial computer, which makes the operation simpler and more convenient, and effectively improves the weighing efficiency of the component gas.

[0039] Detect component gas flow in real time and fill in a certain standard amount of component gas.

[0040] Assume that the volume of the pipeline between the pneumatic valve 4 directly connected to the component gas cylinder 1 and the bottle valve 7 is q1 (unit: L), the standard amount of component gas to be filled is q0 (unit: L), the flow rate detected by the flow sensor is q2 (unit: L), open the bottle valve 7, then open the pneumatic valve 4, and fill the component gas into the work station gas cylinder 6. When the flow value q2=q0-q1 fed back by the flow sensor, close the pneumatic valve 4. When the flow value q2=q0, it means that all the gas in the pipeline has entered the work station gas cylinder 6. Close the bottle valve 7 and the filling is completed.

[0041] Detect the component gas flow rate and fill in a certain standard amount of component gas.

[0042] Assume that the volume of the pipeline between the pneumatic valve 4 and the bottle valve 7 directly connected to the component gas cylinder 1 is q1 (unit: L), the standard amount of component gas to be filled is q0 (unit: L), the flow rate detected by the flow sensor is v (unit: L / s), q1 / v is the time required for the gas in the pipeline between the pneumatic valve 4 and the bottle valve 7 to enter the cylinder, q0 / v is the time required for the standard amount of component gas to be filled into the work station gas cylinder 6, open the bottle valve 7, then open the pneumatic valve 4, fill the component gas into the work station gas cylinder 6, after (q0 / v-q1 / v) time, close the pneumatic valve 4, and when the flow rate value reaches 0, it means that all the gas in the pipeline has entered the work station gas cylinder 6, close the bottle valve 7, and the filling is completed.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent weighing system for gas cylinders for intelligent preparation of standard gas, characterized in that: include: A plurality of component gas cylinders (1) for containing each component gas, on which a manual valve (2), a filter (3) and a pneumatic valve (4) connected in series via a pipeline are sequentially installed; The workstation gas cylinder (6) is used to contain the corresponding component gas, and is sequentially mounted with a cylinder valve (7), a flow sensor (8), a throttle valve (9) and a pressure sensor (10) connected in series through a pipeline, wherein the flow sensor (8) is used to read the gas flow rate and then weigh the filled component gas; The gas path channel (5) is used to provide a channel for weighing and conveying the component gases. The middle section of the gas path channel (5) is connected to the output ends of the plurality of pneumatic valves (4). The right side branch of the gas path channel (5) is connected in series with pneumatic valves (11) and safety valves (13). The pipeline section between the pneumatic valves (11) and the safety valves (13) is equipped with a vacuum gauge sensor (12) for monitoring the vacuum degree inside the pipeline.

2. According to claim 1, a gas cylinder intelligent weighing system for intelligent preparation of standard gas is characterized in that: The right end of the gas path channel (5) is connected to the series pipeline on the workstation gas cylinder (6), and the component gases pass through the pressure sensor (10), the throttle valve (9), the flow sensor (8) and the cylinder valve (7) in sequence to enter the interior of the workstation gas cylinder (6).

3. The intelligent weighing system for gas cylinders for intelligent preparation of standard gas according to claim 1 is characterized in that: A parallel branch is provided on the left side of the gas path channel (5), and the other end of the parallel branch is connected to a one-way valve (16). The other end of the one-way valve (16) is connected to an exhaust gas pool for collecting exhaust gas in the system pipeline.

4. The intelligent weighing system for gas cylinders for intelligent preparation of standard gas according to claim 3 is characterized in that: A pneumatic valve 3 (14) and a vacuum pump (15) are sequentially connected in series on the right side branch of the parallel branch.

5. The intelligent weighing system for gas cylinders for intelligent preparation of standard gas according to claim 3 is characterized in that: A second safety valve (18) is installed on the left branch of the parallel branch.

6. The intelligent weighing system for gas cylinders for intelligent preparation of standard gas according to claim 3 is characterized in that: A pneumatic valve four (17) is installed on the middle part of the parallel branch.

7. The intelligent weighing system for gas cylinders for intelligent preparation of standard gas according to claim 3 is characterized in that: The safety valve 1 (13), the one-way valve (16) and the parallel branch are interconnected.

8. The intelligent weighing system for gas cylinders for intelligent preparation of standard gas according to claim 1 is characterized in that: The intelligent weighing system also includes an industrial computer, wherein the industrial computer is electrically connected to the pressure sensor (10) for transmitting detected air pressure information, the industrial computer is electrically connected to the flow sensor (8) for transmitting detected component gas flow information, and the industrial computer is electrically connected to the vacuum gauge sensor (12) for transmitting the detected vacuum degree inside the gas path (5).

9. The intelligent weighing system for gas cylinders for intelligent preparation of standard gas according to claim 8, characterized in that: The industrial computer is electrically connected to the pneumatic valve 1 (4), the bottle valve (7), the pneumatic valve 2 (11), the pneumatic valve 3 (14), the pneumatic valve 4 (17), and the vacuum pump (15).

Images