Automatic grading and filling system for gas cylinders

Abstract

The utility model belongs to gas filling technical field, concretely relates to a kind of gas cylinder automatic grading filling system.The gas cylinder automatic grading filling system, including cylinder, with the gas inlet unit and purging unit of cylinder connection, the gas inlet unit includes gas inlet pipeline A, gas inlet pipeline B, gas inlet pipeline A inlet is connected with gas storage tank A, gas inlet pipeline B inlet is connected with gas storage tank B, gas inlet pipeline B is connected with gas inlet pipeline A inlet end by reflux pipeline, one-way valve is provided on reflux pipeline;Gas inlet pipeline A outlet is connected with cylinder A, gas inlet pipeline B outlet is connected with cylinder B, and the bottom of cylinder A and cylinder B is provided with platform scale.The gas cylinder automatic grading filling system of the utility model, by the design to gas filling pipeline and purging pipeline, material grading, automatic replacement, filling and stop are simultaneously realized in gas filling process, further improve filling efficiency, precision and safety, and the quality of filling gas is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of gas filling technology, specifically relating to an automatic graded filling system for gas cylinders. Background Technology

[0002] In existing gas filling systems, the filling areas for steel cylinders are mostly open. This open filling environment has significant shortcomings, resulting in a poor filling environment for the steel cylinders. Consequently, the particulate matter index in the cylinder test data is high, affecting the filling quality. In addition, existing systems are mostly designed for filling gas materials of the same purity, and there are many technical bottlenecks in material classification control, automated replacement, and precise filling stop.

[0003] CN22176327U discloses a high-purity boron trifluoride dispensing system. It divides the main pipeline into a vacuum treatment zone and a product filling zone using valves. The raw material gas cylinders and filling gas cylinders in the product filling zone are connected to the main pipeline via valves. The vacuum treatment zone is equipped with a circulating water vacuum pump, a mechanical vacuum pump, and a nitrogen source. The product filling zone is also equipped with a tail gas treatment mechanism, a negative pressure recovery gas cylinder, and a weighing scale. During dispensing, evacuation, product filling, cylinder replacement, and residual gas treatment are performed, ensuring high-purity boron trifluoride while preventing leakage and environmental pollution from the pipeline. However, it primarily focuses on the impact of residual gas in the pipeline on the final purity of the gas in the cylinder, neglecting the influence of the external environment. Furthermore, the operation can only achieve single-cylinder simple filling, resulting in poor integration and low filling efficiency.

[0004] Given the common problems of existing technologies, there is an urgent need to design a system that can accurately fill materials of multiple purities (4N6, 5N) to meet the filling requirements of gases of multiple purities. Utility Model Content

[0005] To overcome the aforementioned deficiencies in the existing technology, the automatic grading and filling system for gas cylinders provided by this utility model, through the design of the filling pipeline and purging pipeline, simultaneously realizes material grading, automatic replacement, filling and stopping during the gas filling process, further improving filling efficiency, accuracy and safety, and ensuring the quality of the filled gas.

[0006] The automatic grading and filling system for gas cylinders of this utility model includes a gas cylinder, an inlet unit and a purging unit connected to the gas cylinder. The inlet unit includes an inlet pipe A and an inlet pipe B. The inlet of inlet pipe A is connected to a gas storage tank A, and the inlet of inlet pipe B is connected to a gas storage tank B. Inlet pipe B is connected to the inlet end of inlet pipe A through a return pipe. A one-way valve is installed on the return pipe to prevent mixing of gases of different concentrations. The outlet of inlet pipe A is connected to gas cylinder A, and the outlet of inlet pipe B is connected to gas cylinder B. A platform scale is installed at the bottom of both gas cylinder A and gas cylinder B.

[0007] The purging unit includes a helium pipeline and a venting pipeline. The helium pipeline connects to the inlet pipeline A via a first helium branch and then to cylinder A. A three-way valve is installed on the inlet pipeline of cylinder A, with one end connected to the venting pipeline for venting gas. The helium pipeline also has a branch connecting to the inlet pipeline B. Gas particle filters are installed on the pipelines where the helium pipeline connects to inlet pipeline A and inlet pipeline B to filter out all particulate impurities in the gas and ensure gas purity.

[0008] Preferably, both cylinder A and cylinder B are placed in an air intake chamber, which is equipped with a pipeline connected to an exhaust system to achieve sealed filling and further clean the filling environment of the cylinders through the exhaust system, ensuring the safety of filling.

[0009] Preferably, the purging unit further includes a vacuum line connected to a venting line, the venting line also having a branch line connected to the exhaust gas treatment device, and the tail end of the venting line having a line connected to the exhaust gas analyzer.

[0010] Preferably, a three-way valve is provided on the inlet pipe of the gas cylinder B. One end of the three-way valve is connected to the gas inlet pipe B, and the other end is provided with a branch. This branch is connected to the exhaust gas treatment device, the exhaust gas analyzer and the vacuum pipe respectively. This branch has the same function as the venting pipe, which is used to vent the gas.

[0011] Preferably, the intake pipe A and intake pipe B are provided with branches that connect to the intake gas analyzer.

[0012] Preferably, pressure gauges are installed on the inlet pipes of cylinder A and cylinder B to monitor the system pressure.

[0013] Specifically, the automatic grading and filling system for gas cylinders has the following working process: First, the cylinders A (compatible with 4N6 purity gas for gas storage tank A) and B (compatible with 5N purity gas for gas storage tank B) to be filled are placed on the platform scale in the air inlet chamber. The air inlet chamber door is closed to form a sealed environment. At the same time, the exhaust system is turned on to continuously purify the filling space through the connecting pipeline, reducing the impact of external particulate matter on the filling quality.

[0014] The system piping and cylinders are pre-treated. The vacuum line in the purging unit is activated to evacuate cylinders A and B, as well as their connected inlet lines A and B. Once the vacuum level is reached, the helium line valve is opened, allowing helium to enter inlet line A and cylinder A, replacing any residual air in the piping. During the purging process, the three-way valve at the inlet of cylinder A is switched to the vent line. The replaced mixed gas is treated by the exhaust gas treatment device before being discharged. A gas analyzer at the end of the vent line monitors the composition of the emitted gas in real time to ensure that impurities in the piping are thoroughly removed. The pre-treatment process for cylinder B is the same as for cylinder A, using the same purging logic to prepare the piping and cylinders for cleanliness. After helium purging, vacuuming is performed again. This process is repeated multiple times before the system can be used. Gas filling is carried out; in addition, the purity of the output gas from gas storage tanks A and B needs to be tested by an inlet gas analyzer. 4N6 and 5N purity gases are matched to cylinders A and B respectively to avoid the risk of mixed filling; after the gas testing is completed, the pipeline is purged again with filling gas before gas filling. The purging uses 5N purity gas. One path of 5N purity gas enters the cylinder B filling unit through the inlet pipeline B for purging, and the other path enters the inlet pipeline A through the return pipeline to purge the cylinder A filling unit. The exhaust gas generated during purging is monitored by an exhaust gas analyzer. Only after the monitoring is qualified can gas filling be carried out. The exhaust gas generated during this purging stage is treated by the exhaust gas treatment device and can be recycled to the upstream device for testing and continued to be used for product filling after passing the test.

[0015] After pretreatment, the system enters the automatic graded filling process. For cylinder A, the valve of the inlet pipe A is opened, and the 4N6 purity gas in the gas storage tank A is transported to cylinder A through the pipe. The bottom platform scale monitors the weight change of the cylinder in real time. When the preset filling amount is reached, the system automatically closes the valve of the inlet pipe A to achieve precise filling stop. Similarly, cylinder B receives 5N purity gas from gas storage tank B through the inlet pipe B, and the platform scale monitors and triggers a stop command simultaneously. When the pressure in the low purity gas pipeline (inlet pipe A) rises sharply due to filling demand or when the supply from the low purity gas storage tank A is insufficient, gas can be replenished directionally from the high purity gas storage tank B through the return pipe (because the purity of 5N is higher than that of 4N6, the purity requirement of cylinder A can still be met after replenishment), realizing dynamic gas regulation. A one-way valve is installed on the return pipe to allow only high purity gas to be transported to low purity gas.

[0016] After a batch of cylinders A and B is filled, the cylinder replacement process begins. At this time, the relevant pipelines need to be cleaned and purged again through the return pipeline. The process is the same as the pretreatment steps, and only 5N gas is used to purge the pipelines.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] The automatic grading and filling system for gas cylinders described in this utility model forms a closed environment through the air intake and exhaust systems. Combined with helium purging, vacuuming, and exhaust gas treatment, it blocks external impurities, reduces particulate matter levels, avoids cross-contamination, and improves gas purity and stability. Independent pipelines and analyzers enable precise grading and filling of 4N6 and 5N purity gases. The platform scale automatically controls the filling volume, and the return pipeline directional adjustment ensures pressure balance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the automatic graded filling system for gas cylinders described in this utility model.

[0020] In the diagram: 1. Gas storage tank A; 2. Gas storage tank B; 3. Inlet gas analyzer; 4. Inlet room; 5. Cylinder B; 6. Platform scale; 7. Tail gas analyzer; 8. Helium pipeline; 9. Vacuum pipeline; 10. Tail gas treatment device; 11. Exhaust system; 12. Cylinder A; 13. Three-way valve; 14. Inlet pipeline A; 15. Inlet pipeline B; 16. Return pipeline; 17. Venting pipeline; 18. First helium branch; 19. Check valve; 20. Gas particulate filter. Detailed Implementation

[0021] The specific technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0022] like Figure 1 As shown, the automatic grading and filling system for gas cylinders includes gas cylinders, an air intake unit connected to the gas cylinders, and a purging unit. The air intake unit includes an air intake pipe A14 and an air intake pipe B15. The inlet of the air intake pipe A14 is connected to the gas storage tank A1; the outlet of the air intake pipe A14 is connected to the gas cylinder A12; the outlet of the air intake pipe B15 is connected to the gas cylinder B5; and the inlet of the air intake pipe B15 is connected to the gas storage tank B2. A platform scale 6 is installed at the bottom of both the gas cylinders A12 and B5.

[0023] The purging unit includes a helium pipeline 8 and a venting pipeline 17. The helium pipeline 8 is connected to the inlet pipeline A14 via a first helium branch 18, and a gas particle filter 20 is installed after the connection point. The venting pipeline 17 is connected to the inlet pipeline of the gas cylinder A12, and a three-way valve 13 is installed at the connection point.

[0024] The intake pipe B15 is provided with a return pipe 16 connected to the inlet end of the intake pipe A14, and a one-way valve 19 is provided on the return pipe 16.

[0025] The helium pipeline 8 is also provided with a branch line connected to the inlet pipeline B15, and a gas particle filter 20 is provided on the inlet pipeline B15 after the connection point.

[0026] Both cylinder A12 and cylinder B5 are placed in the air inlet chamber 4, which is equipped with a pipeline connected to the exhaust system 11.

[0027] The purging unit also includes a vacuum line 9, which is connected to a venting line 17. The venting line 17 is also provided with a branch line connected to the exhaust gas treatment device 10.

[0028] The tail end of the venting pipe 17 is provided with a pipe that connects to the exhaust gas analyzer 7.

[0029] A three-way valve 13 is installed on the inlet pipe of the gas cylinder B5. One end of the three-way valve 13 is connected to the gas inlet pipe B15, and the other end is provided with a branch line, which is connected to the exhaust gas treatment device 10, the exhaust gas analyzer 7 and the vacuum pipe 9 respectively.

[0030] The intake pipes A14 and B15 are provided with branches that connect to the intake gas analyzer 3.

[0031] The above-mentioned automatic graded filling system for gas cylinders is used to fill 4N6 and 5N grade nitrogen trifluoride gas. The working process is as follows: First, the cylinders A12 (4N6 purity gas suitable for gas storage tank A1) and B5 (5N purity gas suitable for gas storage tank B2) to be filled are placed on the scale 6 in the air inlet chamber 4, the door of the air inlet chamber 4 is closed to form a sealed environment, and the exhaust system 11 is turned on to continuously purify the filling space through the connecting pipeline, thereby reducing the impact of external particulate matter on the filling quality.

[0032] The system pipelines and cylinders are pre-treated. The vacuum line 9 in the purging unit is started to evacuate cylinders A12 and B5 and the connected inlet lines A14 and B15. After the vacuum level reaches the standard, the valve of the helium line 8 is opened, and helium enters the inlet line A14 and cylinder A12 to replace the residual air in the pipeline. During the purging process, the three-way valve 13 at the inlet of cylinder A12 is switched to the vent line 17. The replaced mixed gas is treated by the tail gas treatment device 10 and then discharged. The tail gas analyzer 7 at the end of the vent line 17 monitors the composition of the discharged gas in real time to ensure that impurities in the pipeline are fully removed. The pre-treatment process of cylinder B5 is the same as that of cylinder A12. The cleanliness of the pipeline and cylinder is prepared by the same purging logic. After the helium purging is completed, the vacuum treatment is performed again. The gas filling can only be carried out after the purging is repeated multiple times.

[0033] In addition, the purity of the output gas from gas storage tanks A1 and B2 needs to be tested by the inlet gas analyzer 3. Gases with 4N6 and 5N purity are matched with steel cylinders A12 and B5 respectively to avoid the risk of mixing.

[0034] After gas testing is completed, the pipeline is purged again with filling gas before gas filling. The purging uses 5N purity gas. One 5N purity gas enters the B5 filling unit of the cylinder through the inlet pipe B15 for purging, and the other enters the inlet pipe A14 through the return pipe 16 to purge the A12 filling unit of the cylinder. The exhaust gas generated during purging is monitored by the exhaust gas analyzer 7. Only after the monitoring is qualified can gas filling be carried out. The exhaust gas generated in this purging stage is treated by the exhaust gas treatment device 10 and can be recycled to the upstream device for testing and continued to be used for product filling after passing the test.

[0035] After pretreatment, the system enters the automatic tiered filling process. For cylinder A12, the valve of the inlet pipe A14 is opened, and the 4N6 purity gas in gas storage tank A1 is transported to cylinder A12 through the pipe. The bottom scale 6 monitors the weight change of the cylinder in real time. When the preset filling amount is reached, the system automatically closes the valve of the inlet pipe A14 to achieve precise filling stop. Similarly, cylinder B5 receives 5N purity gas from gas storage tank B2 through the inlet pipe B15. The scale 6... Synchronous monitoring and triggering of stop commands; when the pressure of the low-purity gas pipeline (inlet pipeline A14) suddenly increases due to filling demand or when the supply of low-purity gas tank A1 is insufficient, gas can be directionally replenished from high-purity gas tank B2 through return pipeline 16 (because the purity of 5N is higher than that of 4N6, the purity requirement of cylinder A12 can still be met after replenishment), realizing dynamic adjustment of gas, and a one-way valve 19 is installed on return pipeline 16 to allow only high-purity gas to be transported to low-purity gas.

[0036] After a batch of cylinders A12 and B5 are filled, the cylinder replacement process begins. At this time, the relevant pipelines need to be cleaned and purged again through the return pipeline 16. The process is the same as the pretreatment steps, and only 5N gas is used to purge the pipelines.

Claims

1. An automatic grading and filling system for gas cylinders, comprising a gas cylinder, an inlet unit connected to the gas cylinder, and a purging unit, characterized in that, The air intake unit includes an air intake pipe A (14) and an air intake pipe B (15). The inlet of the air intake pipe A (14) is connected to the gas storage tank A (1). The outlet of the air intake pipe A (14) is connected to the gas cylinder A (12). The outlet of the air intake pipe B (15) is connected to the gas cylinder B (5). The inlet of the air intake pipe B (15) is connected to the gas storage tank B (2). A platform scale (6) is provided at the bottom of both the gas cylinder A (12) and the gas cylinder B (5). The purging unit includes a helium pipeline (8) and a venting pipeline (17). The helium pipeline (8) is connected to the inlet pipeline A (14) through the first helium branch (18), and a gas particle filter (20) is installed after the connection point. The venting pipeline (17) is connected to the inlet pipeline of the gas cylinder A (12), and a three-way valve (13) is installed at the connection point.

2. The automatic grading and filling system for gas cylinders according to claim 1, characterized in that, The intake pipe B (15) is provided with a return pipe (16) connected to the inlet end of the intake pipe A (14), and a one-way valve (19) is provided on the return pipe (16).

3. The automatic grading and filling system for gas cylinders according to claim 1, characterized in that, The helium pipeline (8) is also provided with a branch connected to the inlet pipeline B (15), and a gas particle filter (20) is provided on the inlet pipeline B (15) after the connection point.

4. The automatic grading and filling system for gas cylinders according to claim 1, characterized in that, Both cylinder A (12) and cylinder B (5) are placed in the air intake chamber (4), which is equipped with a pipeline connected to the exhaust system (11).

5. The automatic grading and filling system for gas cylinders according to claim 1, characterized in that, The purging unit also includes a vacuum line (9), which is connected to a venting line (17). The venting line (17) is also provided with a branch line connected to the exhaust gas treatment device (10).

6. The automatic grading and filling system for gas cylinders according to claim 5, characterized in that, The tail end of the venting pipe (17) is provided with a pipe that connects to the exhaust gas analyzer (7).

7. The automatic grading and filling system for gas cylinders according to claim 6, characterized in that, A three-way valve (13) is installed on the inlet pipe of the gas cylinder B (5). One end of the three-way valve (13) is connected to the gas inlet pipe B (15), and the other end is provided with a branch line, which is connected to the exhaust gas treatment device (10), the exhaust gas analyzer (7) and the vacuum pipe (9) respectively.

8. The automatic grading and filling system for gas cylinders according to claim 1, characterized in that, The intake pipes A (14) and B (15) are provided with branches that connect to the intake gas analyzer (3).

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