Component weight calculation system of large-volume gas cylinder

Abstract

The utility model relates to the technical field of metering and weighing, in particular to a component weight calculating system of a large-volume gas cylinder. When the controller controls the gas source switch valve, the first switch valve and the second switch valve to be opened, gas in the gas source gas cylinder flows to the first receiving gas cylinder and the second receiving gas cylinder through the first pipeline and the second pipeline respectively; the first balance is used for recording gas variation in the gas source gas cylinder before and after the controller controls the gas source switching valve, the first switching valve and the second switching valve to be opened; the second balance is used for recording the gas variable quantity in the gas source gas cylinder before and after the controller controls the gas source switch valve, the first switch valve and the second switch valve to be opened, and the controller is used for receiving the gas variable quantity recorded by the first balance and the gas variable quantity recorded by the second balance and calculating the component weight of the large-volume gas cylinder.

Description

Technical Field

[0001] This utility model relates to the field of metrology and weighing technology, and in particular to a component weight calculation system for a large-volume gas cylinder. Background Technology

[0002] Currently, when weighing large-volume gas cylinders (such as 40L cylinders), the Mettler Toledo ICS435 balance is commonly used. This balance has a graduation of 1g and a weighing range of 0-150kg. However, in actual weighing processes, the accuracy and stability of the weighing results are difficult to guarantee due to various factors such as environment and operating techniques. Because large-volume gas cylinders are inherently heavy, the actual error may exceed 5% when performing weighing operations such as adding gas, severely affecting data accuracy and failing to meet high-precision weighing requirements.

[0003] Therefore, there is an urgent need for a component weight calculation system for large-volume gas cylinders to solve the above-mentioned technical problems. Utility Model Content

[0004] This invention provides a component weight calculation system for large-volume gas cylinders, which can accurately calculate the component weight of large-volume gas cylinders.

[0005] This utility model embodiment provides a component weight calculation system for a large-volume gas cylinder, including a gas source cylinder, a first pipeline, a second pipeline, a first receiving gas cylinder, a second receiving gas cylinder, a first balance, a second balance, a gas source switch valve, a first switch valve, a second switch valve, and a controller;

[0006] The gas source cylinder, the first pipeline, and the first receiving cylinder are connected in sequence, and the gas source cylinder, the second pipeline, and the second receiving cylinder are connected in sequence.

[0007] The controller is electrically connected to the first balance, the second balance, the gas source switch valve, the first switch valve, and the second switch valve, respectively.

[0008] The gas source cylinder is set on the first balance, the first receiving cylinder is set on the second balance, the gas source switch valve is set at the outlet of the gas source cylinder, the first switch valve is set at the inlet of the first receiving cylinder, and the second switch valve is set at the inlet of the second receiving cylinder.

[0009] The volume of the first receiving gas cylinder is smaller than the volume of the second receiving gas cylinder.

[0010] Preferably, the controller adopts the RS-485 protocol.

[0011] Preferably, the volume of the first receiving gas cylinder is eight liters, and the volume of the second receiving gas cylinder is forty liters.

[0012] Preferably, the volume of the gas source cylinder is twenty liters.

[0013] Preferably, the first receiving gas cylinder is provided with a metering tube on its exterior, and the metering tube is connected to the first receiving gas cylinder through a shut-off valve, which is used to control the flow of fluid.

[0014] Preferably, the air source switching valve, the first switching valve, and the second switching valve are all pneumatic valves.

[0015] Preferably, the gas source switching valve, the first switching valve, and the second switching valve are all mechanical valves.

[0016] As can be seen from the above scheme, the component weight calculation system for large-volume gas cylinders provided by this utility model, when the controller controls the gas source switch valve, the first switch valve and the second switch valve to be fully opened, the gas in the gas source cylinder flows to the first receiving gas cylinder and the second receiving gas cylinder through the first pipeline and the second pipeline respectively. The first balance is used to record the gas change in the gas source cylinder before and after the controller controls the gas source switch valve, the first switch valve and the second switch valve to be fully opened. The second balance is used to record the gas change in the gas source cylinder before and after the controller controls the gas source switch valve, the first switch valve and the second switch valve to be fully opened. The controller is used to receive the gas change recorded by the first balance and the gas change recorded by the second balance and to calculate the component weight of the large-volume gas cylinder. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of the component weight calculation system provided in this embodiment of the utility model;

[0019] Figure 2 This is a partial schematic diagram of the structure of the component weight calculation system provided in an embodiment of the present invention.

[0020] Figure label:

[0021] 1-Gas source cylinder;

[0022] 2-First receiving gas cylinder;

[0023] 3-Second receiving gas cylinder;

[0024] 4-Controller;

[0025] 5-The second day was flat;

[0026] 6-First Day of Balance;

[0027] 7-First pipeline;

[0028] 8-Second pipeline;

[0029] 9-Quantitative tube;

[0030] 10 - Shut-off valve. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] Please see Figure 1 One embodiment of this utility model provides a component weight calculation system for a large-volume gas cylinder. The system includes a gas source cylinder 1, a first pipeline 7, a second pipeline 8, a first receiving gas cylinder 2, a second receiving gas cylinder 3, a first balance 6, a second balance 5, a gas source switch valve (not shown in the figure), a first switch valve (not shown in the figure), a second switch valve (not shown in the figure), and a controller 4.

[0033] Gas source cylinder 1, first pipeline 7 and first receiving cylinder 2 are connected in sequence, and gas source cylinder 1, second pipeline 8 and second receiving cylinder 3 are connected in sequence.

[0034] Controller 4 is electrically connected to the first level 6, the second level 5, the gas source switch valve, the first switch valve, and the second switch valve, respectively.

[0035] Gas source cylinder 1 is set on the first level 6, first receiving cylinder 2 is set on the second level 5, gas source switch valve is set at the outlet of gas source cylinder 1, first switch valve is set at the inlet of first receiving cylinder 2, and second switch valve is set at the inlet of second receiving cylinder 3.

[0036] The volume of the first receiving gas cylinder 2 is smaller than the volume of the second receiving gas cylinder 3.

[0037] In this embodiment, the controller 4 is used to control the opening and closing of the gas source switch valve, the first switch valve, and the second switch valve. When the controller 4 controls the gas source switch valve, the first switch valve, and the second switch valve to all open, the gas in the gas source cylinder 1 flows to the first receiving cylinder 2 and the second receiving cylinder 3 through the first pipeline 7 and the second pipeline 8, respectively. The first balance 6 is used to record the gas change in the gas source cylinder 1 before and after the controller 4 controls the gas source switch valve, the first switch valve, and the second switch valve to all open. The second balance 5 is used to record the gas change in the gas source cylinder 1 before and after the controller 4 controls the gas source switch valve, the first switch valve, and the second switch valve to all open. The controller 4 is used to receive the gas change recorded by the first balance 6 and the gas change recorded by the second balance 5, and to calculate the component weight of the large-volume cylinder.

[0038] In one embodiment of the present invention, the controller 4 adopts the RS-485 protocol.

[0039] In this embodiment, the controller 4 uses the RS-485 protocol. This protocol, with its significant advantages in data communication, is an ideal choice for data interaction in this system. The RS-485 protocol has strong anti-interference capabilities, effectively resisting various electromagnetic interferences and noise effects in complex industrial environments, ensuring the accuracy and stability of data transmission. Simultaneously, it has a long transmission distance, meeting the long-distance data transmission needs between different devices in the system. This allows the controller 4 to reliably interact with devices such as the first balance 6, the second balance 5, the gas source switching valve, the first switching valve, and the second switching valve, ensuring the efficient and stable operation of the entire large-volume gas cylinder component weight calculation system.

[0040] In one embodiment of the present invention, the volume of the first receiving gas cylinder 2 is eight liters, and the volume of the second receiving gas cylinder 3 is forty liters.

[0041] In this embodiment, a differentiated gas cylinder volume design is adopted. The volume of the first receiving gas cylinder 2 is precisely set to 8 liters, while the volume of the second receiving gas cylinder 3 is 40 liters. The two form a 5:1 volume ratio, which allows for a more accurate determination of the component weights of the larger gas cylinder (the second receiving gas cylinder 3).

[0042] In one embodiment of the present invention, the volume of the gas source cylinder 1 is twenty liters.

[0043] In this embodiment, the gas source cylinder 1 is selected with a volume of 20 liters. This capacity setting can provide sufficient gas source for the synchronous filling of the first receiving gas cylinder 2 (8 liters) and the second receiving gas cylinder 3 (40 liters), and can also accurately measure the gas output through its weight change.

[0044] In one embodiment of the present invention, a metering tube 9 is provided on the outside of the first receiving gas cylinder 2. The metering tube 9 is connected to the first receiving gas cylinder 2 through a shut-off valve 10, which is used to control the flow of fluid.

[0045] like Figure 2 As shown, in this embodiment, to achieve more precise gas metering control, a metering tube 9 is installed outside the first receiving gas cylinder 2. It is connected to the first receiving gas cylinder 2 via a shut-off valve 10. The shut-off valve 10 can precisely control the flow of fluid. When a predetermined amount of gas needs to be supplied to the first receiving gas cylinder 2, the shut-off valve can be opened, allowing gas to flow into the first receiving gas cylinder 2 from the metering tube 9; and when the predetermined gas volume is reached, the shut-off valve is closed in time to effectively prevent further inflow or outflow of gas, thereby ensuring the accuracy and stability of the gas volume in the first receiving gas cylinder 2.

[0046] In one embodiment of the present invention, the air source switching valve, the first switching valve, and the second switching valve are all pneumatic valves.

[0047] In this embodiment, the gas source switching valve, the first switching valve, and the second switching valve are all pneumatic valves. These valves, driven by compressed air, possess characteristics such as fast response speed, high control precision, and strong anti-interference capability. They can achieve millisecond-level opening and closing actions under controller commands, effectively ensuring the stability of flow and pressure during gas delivery, while simultaneously meeting the system's automation and high-precision measurement requirements.

[0048] In one embodiment of the present invention, the gas source switching valve, the first switching valve, and the second switching valve are all mechanical valves.

[0049] In this embodiment, to ensure the stability and reliability of the system operation, mechanical valves are selected for the air source switching valve, the first switching valve, and the second switching valve. Mechanical valves are known for their simple structure and durability, achieving precise control of the air path through physical mechanical movement. Compared to electronic or pneumatic valves, mechanical valves are less susceptible to electromagnetic interference and air pressure fluctuations, and can maintain stable performance in complex industrial environments.

[0050] In one embodiment of the present invention, the second preset length ratio of the first pipe 7 and the second pipe 8 is determined by the following steps:

[0051] Step S1: Based on the volumes of the first receiving gas cylinder 2 and the second receiving gas cylinder 3, determine the first preset length ratio of the first pipeline 7 and the second pipeline 8;

[0052] Step S2: Determine the total volume of the first pipe 7 and the second pipe 8 based on the first preset length ratio;

[0053] Step S3: Control the gas source switch valve, the first switch valve and the second switch valve to open simultaneously. After a preset time, control the gas source switch valve, the first switch valve and the second switch valve to close simultaneously. Then, use the first day balance 6 and the second day balance 5 to determine the gas change of the gas source cylinder 1 and the first receiving cylinder 2 at this time.

[0054] Step S4: Based on the total volume, the gas change of the gas source cylinder 1 and the first receiving cylinder 2, determine the gas change of the second receiving cylinder 3.

[0055] Step S5: Based on the gas change of the first receiving gas cylinder 2 and the second receiving gas cylinder 3, determine the second preset length ratio of the first pipeline 7 and the second pipeline 8.

[0056] In this embodiment, firstly, based on the volume parameters of the first receiving gas cylinder 2 and the second receiving gas cylinder 3, a first preset length ratio between the first pipeline 7 and the second pipeline 8 is determined. Then, based on this ratio and combined with the pipeline's geometric characteristics, the total volume of the first pipeline 7 and the second pipeline 8 is further calculated. Next, the controller 4 synchronously controls the opening of the gas source switch valve, the first switch valve, and the second switch valve, allowing the gas to flow stably in the pipeline system. After a preset time is reached, the valves are quickly closed. At this time, relying on the first balance 6 and the second balance 5 electrically connected to the controller 4, the gas mass change of the gas source cylinder 1 and the first receiving gas cylinder 2 is collected and recorded in real time. Then, based on the acquired total pipeline volume, the gas change data of the gas source cylinder 1 and the first receiving gas cylinder 2, and combined with the law of conservation of mass, the gas change of the second receiving gas cylinder 3 is calculated. Since the first preset length ratio only considers the influence of volume parameters on the pipe length ratio, in the actual experimental environment, the pipe length ratio will also be affected by various factors such as gas flow rate, temperature, and pipe inner wall roughness. Therefore, it is necessary to further calculate the second preset length ratio of the first pipe 7 and the second pipe 8 based on the gas change of the first and second receiving gas cylinders 3 to obtain a more realistic second preset length ratio.

[0057] In one embodiment of the present invention, step S2 includes:

[0058] Step S21: Evacuate the gas source cylinder 1, the first receiving cylinder 2, and the second receiving cylinder 3;

[0059] Step S22: Open the first switch valve and fill the first receiving gas cylinder 2 with nitrogen gas;

[0060] Step S23: When the pressure in the first receiving gas cylinder 2 reaches the preset pressure, stop filling with nitrogen and close the first switch valve;

[0061] Step S24: Close the second switch valve and the gas source switch valve, open the first switch valve, and after the second preset time, close the first switch valve to purge the gas in the first pipeline 7 and the second pipeline 8, and use the second day's balance 5 to measure the first weight of the first receiving gas cylinder 2.

[0062] Step S25: Open the first switch valve, record the pressure in the first pipeline 7 and the second pipeline 8 after the third preset time, close the first switch valve, empty the gas in the first pipeline 7 and the second pipeline 8, and use the second day balance 5 to measure the second weight of the first receiving gas cylinder 2.

[0063] Step S26: Determine the weight difference based on the first weight and the second weight;

[0064] Step S28: Determine the total volume of the first pipe 7 and the second pipe 8 based on the weight difference and the pressure in the first pipe 7 and the second pipe 8.

[0065] In this embodiment, step S2 is specifically detailed as follows: Vacuuming is performed on the gas source cylinder 1, the first receiving cylinder 2, and the second receiving cylinder 3 to ensure that the inside of each cylinder is in a near-vacuum, pure state, laying the foundation for subsequent accurate gas filling and measurement. The first valve is opened to begin filling the first receiving cylinder 2 with nitrogen. During this process, close monitoring of the gas filling is necessary to ensure that the gas enters the cylinder stably and uniformly. When the pressure inside the first receiving gas cylinder 2 reaches the preset pressure value, the nitrogen filling operation is immediately stopped, and the first switch valve, the second switch valve, and the gas source switch valve are quickly closed. The first switch valve is then opened to allow the nitrogen from the first receiving gas cylinder 2 to flow into the first pipeline 7 and the second pipeline 8. After a second preset time, the first switch valve is closed to purge the gas from the first pipeline 7 and the second pipeline 8, and the first weight of the first receiving gas cylinder 2 is measured using the second day's balance 5. The first switch valve is then opened to allow the refilled nitrogen from the first receiving gas cylinder 2 to flow into the first pipeline 7 and the second pipeline 8. After a third preset time, the pressure in the first pipeline 7 and the second pipeline 8 is recorded. The first switch valve is then closed to purge the gas from the first pipeline 7 and the second pipeline 8, and the second weight of the first receiving gas cylinder 2 is measured using the second day's balance 5. Based on the calculated weight difference and the pressure in the first pipeline 7 and the second pipeline 8, the total volume of the first pipeline 7 and the second pipeline 8 is finally determined.

[0066] In one embodiment of the present invention, after determining the weight difference based on the first weight and the second weight, the method further includes:

[0067] Repeat steps S21 to S26 to obtain multiple weight differences;

[0068] The average weight difference is obtained by averaging the multiple weight differences.

[0069] The final total volume of the first pipe 7 and the second pipe 8 is determined based on the average weight difference.

[0070] In this embodiment, after obtaining the difference between the first weight and the second weight (i.e., the weight difference), to further improve the accuracy and reliability of the measurement results, an optimization strategy of averaging multiple measurements is adopted: First, steps S21 to S26 are executed repeatedly, and multiple weight differences are obtained by repeatedly performing operations such as vacuuming, nitrogen filling, pressure adjustment, gas venting, and weight measurement; then, the multiple weight differences are statistically analyzed, and the average weight difference is obtained by arithmetic average calculation; finally, based on the average weight difference, combined with the gas state equation and related physical parameters, the final total volume of the first pipeline 7 and the second pipeline 8 is accurately calculated, thereby reducing the impact of single measurement error on the results and achieving high-precision measurement of the total pipeline volume.

[0071] In this embodiment, the 8L (first receiving gas cylinder 2), 20L first receiving gas cylinder 2 (gas source cylinder 1), and 40L (first receiving gas cylinder 2) are first connected to the gas distribution equipment. Next, the vacuum valve is opened, and the air in the pipeline is completely evacuated using a vacuum pump. The vacuum valve is then closed to ensure a relatively pure environment within the pipeline, reducing interference from external air in subsequent experiments. Subsequently, the valve of the 8L gas cylinder is opened, and nitrogen is simultaneously introduced into the 8L gas cylinder via the nitrogen valve. When the pressure inside the cylinder reaches 10MPa (this pressure value can be adjusted flexibly according to actual measurement needs; the key is to ensure sufficient gas for measurement), the nitrogen valve and the 8L gas source valve are promptly closed to precisely control the gas volume and pressure within the cylinder. After filling, the pressure in the pipeline is released through the vent valve, restoring the pipeline to its initial state. At this point, the 8L gas cylinder is weighed using a high-precision weighing device, and its weight is recorded as 8511.20g. Afterward, the 8L gas cylinder is reconnected to the gas distribution equipment, and the pipeline evacuation process is repeated. The pressure in the system was increased to 1 kg by controlling the 8L gas source switch valve, and then the 8L gas source switch valve was closed to release the pressure in the pipeline again. The 8L gas cylinder was weighed again and the weight was recorded as 8510.91g. The weight difference between the two weighings was calculated as 8511.2 - 8510.91 = 0.29g. Based on the ideal gas law, the corresponding volume V = 0.232L was calculated accurately. To improve the accuracy and reliability of the measurement results, multiple measurements and calculations were performed under different pipeline pressure conditions following the above procedure. Finally, all measurement results were statistically analyzed, and the average value was found to be 0.2315L.

[0072] In one embodiment of the present invention, the total volume is determined by the following formula:

[0073] V = mRTMP

[0074] In the formula, V is the total volume, m is the weight difference, M is the molar mass, R is the universal gas constant, T is the thermodynamic temperature of the gas, and P is the pressure in the first pipe 7 and the second pipe 8.

[0075] In one embodiment of the present invention, step S1 includes:

[0076] Based on the volumes of the first receiving gas cylinder 2 and the second receiving gas cylinder 3, a first flow rate ratio between the first receiving gas cylinder 2 and the second receiving gas cylinder 3 is determined.

[0077] Based on the first flow rate ratio, a first preset length ratio between the first pipeline 7 and the second pipeline 8 is determined.

[0078] In this embodiment, when the lengths of the first pipeline 7 and the second pipeline 8 are equal, a first flow rate ratio between the first receiving gas cylinder 2 and the second receiving gas cylinder 3 is calculated based on their volume parameters. This ratio reflects the flow rate difference characteristics of gas flowing into gas cylinders of different volumes under the same pipeline length conditions. Then, based on the aforementioned first flow rate ratio, a first preset length ratio that the first pipeline 7 and the second pipeline 8 should satisfy under the condition that the flow rates of the first receiving gas cylinder 2 and the second receiving gas cylinder 3 are the same is determined, thereby providing key parameter basis for subsequent precise control of gas distribution and pipeline design.

[0079] In this embodiment, the gas source switching valves (covering brands such as Sanan, Huqiwei, GCE, and Rodales) and the panel valves on the gas distribution equipment (Swagelok brand) all have a uniform nominal diameter of 4mm. The gas distribution equipment uses 1 / 4-inch stainless steel internally polished tubing with an inner diameter accurate to 6.35mm; the pneumatic valves have an inner diameter of 2.5mm. Both the first pipeline 7 and the second pipeline 8 use stainless steel internally polished tubing of the same manufacturer and model, with an inner diameter of 1.755mm. This size constitutes the minimum inner diameter constraint in the entire gas passage. Based on the characteristics of the external pipelines, it is assumed that the friction coefficient and inner diameter of the two pipelines are completely identical. When simultaneously filling 40L and 8L gas cylinders, to ensure that the pressure rise rate of both is consistent (i.e., the derivative of pressure with respect to time, dP / dt, is equal), and assuming that the temperature remains constant during the filling process, [further details are needed]. According to the ideal gas law PV=nRT, since pressure P is directly proportional to the amount of gas n, we can derive dn / dt=(P / (RT))*dv / dt. Given that the volume v of the gas cylinder is a fixed value during filling, the pressure change rate dP / dt directly depends on the change rate of the amount of gas n dn / dt. Simultaneously, the gas flow rate Q can be further converted to mass flow rate for analysis. Theoretical analysis shows that larger-volume gas cylinders require higher gas flow rates to achieve the same pressure change rate as smaller-volume cylinders. Taking a 40L cylinder and an 8L cylinder as examples, the relationship Q8 / V8=Q40 / V40 must be satisfied. From this, we derive the required flow rate ratio Q8 / Q40=V8 / V40=8 / 40=1 / 5, meaning the gas flow rate required for the 40L cylinder should be 5 times that of the 8L cylinder to ensure the same pressure increase rate. Given that the two pipelines are connected to the same gas source and have the same target pressure difference, calculations using relevant fluid mechanics formulas show that the length ratio of the two pipelines needs to be 25:1. Specifically, if the pipeline length corresponding to a 40L gas cylinder is set to 1 meter, then the pipeline length corresponding to an 8L gas cylinder should be 25 meters to achieve precise inflation control.

[0080] In one embodiment of the present invention, step S5 includes:

[0081] Based on the gas change in the first receiving gas cylinder 2 and the second receiving gas cylinder 3, a second flow ratio between the first receiving gas cylinder 2 and the second receiving gas cylinder 3 is determined.

[0082] Based on the second flow ratio, a second preset length ratio between the first pipeline 7 and the second pipeline 8 is determined.

[0083] In this embodiment, since the first preset length ratio is the ideal length ratio, the actual pipe length ratio deviates due to factors such as the degree of pipe bending, the inconsistency between the actual pipe friction and the actual pipe inner diameter, temperature changes during the inflation process, and the pressure drop of the gas source during inflation. Therefore, the optimal length ratio needs to be confirmed through relevant experiments. Thus, a second preset length ratio also needs to be determined. Nitrogen is simultaneously injected into the 8L and 40L gas cylinders. When the pressure inside the cylinders reaches a specific value, the first and second switch valves are closed. Subsequently, the gas flow rate in the two cylinders is determined by weighing the weight changes of the 8L and 40L cylinders, and the appropriate pipe length ratio is calculated according to relevant formulas. Before the experiment, the cylinders that have been vacuumed are accurately weighed. The 20L aluminum alloy cylinder weighs 19800.5g and is weighed using an Intec SIWADCP-1-35-S balance, which has a weighing range of 0-35000g and a graduation of 0.5g. After filling the 20L cylinder with nitrogen at approximately 15MPa, its weight was measured again to be 23550.5g. The 8L cylinder, after being evacuated, weighed 7501.52g and was weighed using a Mettler Toledo MSI2002TS / 02 balance (graduation 0.01g, range 0-12200g). The 8L, 20L, and 40L cylinders were connected to the system. The evacuation valve was opened, and the air in the pipeline was completely evacuated using a vacuum pump, then the evacuation valve was closed. Next, the valves of the 8L and 40L cylinders were opened, and the first and second switching valves were closed. Then, the valve of the 20L cylinder was opened. The first and second switching valves were simultaneously opened via controller 4. When the balance reading for the 8L cylinder changed by 200g, the first and second switching valves were quickly closed simultaneously, followed by closing the valves of the 8L, 40L, and 20L cylinders. Next, the first and second valves were opened again, and the pressure in the pipeline was recorded as 78.3 kg / cm². The pressure in the pipeline was then released, and the 8L cylinder was weighed again: 7702.33 g (weight difference of 200.81 g); the 20L cylinder was weighed: 22301.0 g (weight difference of 1249.5 g). The weight of the gas in the pipeline was calculated using the ideal gas law PV = nRT. The calculation yields 78.3 × 0.2315 = m × 22.4 ÷ 28, solving for m gives m = 22.658 g. Therefore, the weight change of the 40L cylinder is calculated as 1249.5 - 22.658 - 200.81 = 1026.032 g. Calculations show that the flow rate ratio between the 40L and 8L gas cylinders is 1026.032 ÷ 200.81 = 5.1094, or Q40 / Q8 = 5.1094. If the pipe length corresponding to the 40L cylinder is fixed at 1 meter, the flow rate ratio can be adjusted to meet the requirement of Q40 / Q8 = 5 by adjusting the pipe length corresponding to the 8L cylinder. Calculations show that the pipe length L corresponding to the 8L cylinder should be 23.94 meters.

[0084] It should be noted that in this invention, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0085] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is used only to illustrate the technical solution of this utility model, and is not intended to limit the protection scope of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model are included within the protection scope of this utility model.

Claims

1. A component weight calculation system for a large-volume gas cylinder, characterized in that, It includes a gas source cylinder (1), a first pipeline (7), a second pipeline (8), a first receiving gas cylinder (2), a second receiving gas cylinder (3), a first level (6), a second level (5), a gas source switch valve, a first switch valve, a second switch valve, and a controller (4); The gas source cylinder (1), the first pipeline (7) and the first receiving cylinder (2) are connected in sequence, and the gas source cylinder (1), the second pipeline (8) and the second receiving cylinder (3) are connected in sequence. The controller (4) is electrically connected to the first balance (6), the second balance (5), the gas source switch valve, the first switch valve and the second switch valve respectively; The gas source cylinder (1) is set on the first balance (6), the first receiving cylinder (2) is set on the second balance (5), the gas source switch valve is set at the outlet of the gas source cylinder (1), the first switch valve is set at the inlet of the first receiving cylinder (2), and the second switch valve is set at the inlet of the second receiving cylinder (3). The volume of the first receiving gas cylinder (2) is smaller than the volume of the second receiving gas cylinder (3).

2. The component weight calculation system for large-volume gas cylinders according to claim 1, characterized in that, The controller (4) adopts the RS-485 protocol.

3. The component weight calculation system for large-volume gas cylinders according to claim 1, characterized in that, The volume of the first receiving gas cylinder (2) is eight liters, and the volume of the second receiving gas cylinder (3) is forty liters.

4. The component weight calculation system for large-volume gas cylinders according to claim 3, wherein the volume of the gas source cylinder (1) is twenty liters.

5. The component weight calculation system for large-volume gas cylinders according to claim 3, characterized in that, The first receiving gas cylinder (2) is provided with a metering tube (9) on its outside. The metering tube (9) is connected to the first receiving gas cylinder (2) through a shut-off valve (10). The shut-off valve (10) is used to control the flow of fluid.

6. In the component weight calculation system for large-volume gas cylinders according to claim 1, the gas source switch valve, the first switch valve, and the second switch valve are all pneumatic valves.

7. The component weight calculation system for a large-volume gas cylinder according to claim 1, wherein the gas source switch valve, the first switch valve, and the second switch valve are all mechanical valves.

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