A gas cylinder mis-filling prevention control system and control method

Abstract

The present invention relates to a control system and a control method for preventing wrong filling of gas cylinders, and relates to the technical field of gas cylinder filling, wherein the control system for preventing wrong filling of gas cylinders comprises: a main filling pipeline, a first filling mechanism, a second filling mechanism, a venting mechanism, a vacuuming mechanism, and a vacuuming detection mechanism. The first filling mechanism and the second filling mechanism are both connected to the main filling pipeline via a filling valve. The first filling mechanism and the second filling mechanism are both connected to the inlet of the venting valve of the venting mechanism via an isolation valve. The vacuuming control valve of the vacuuming mechanism is connected to the outlet of the isolation valve of the second filling mechanism. The vacuuming detection mechanism is connected to the inlet of the venting valve. The technical solution of the present invention can complete the whole process from vacuuming before filling of the gas cylinder to the end of setting the filling pressure, thereby solving the problems of the current gas cylinder filling operation being difficult to implement and unstable operation management.

Description

Technical Field

[0001] The present invention relates to the technical field of gas cylinder filling, and in particular to a gas cylinder mis-filling prevention control system and a control method. Background Art

[0002] The safety of gas use is directly related to the vital interests of people's production and life. Gas cylinders containing gas are high-pressure containers in special equipment. Therefore, the standardized operation of gas cylinder filling process depends on the safety of gas filling and gas cylinder use. Common gas cylinder explosion accidents are generally related to chemical explosions caused by oxidation reactions. The reason is that combustible gas (substances) mixed with oxygen in the gas cylinder form an explosive mixture. When encountering an ignition source or a certain amount of excitation energy, it will cause a violent chemical explosion.

[0003] Solving the problem of evacuating and replacing the remaining gas in the gas cylinder is the key to preventing gas mis-filling and mixed filling, and preventing chemical explosion accidents in gas cylinders. In particular, the evacuation of oxygen cylinders is extremely important for safety in preventing the mixing of combustible gas and oxygen; the evacuation of the remaining gas in pure gas and high-purity gas (99.995% pure argon, 99.999% high-purity nitrogen) cylinders has great economic value in stabilizing product quality, reducing cumbersome processes, and improving efficiency.

[0004] At present, almost all filling stations have clear rules and regulations and supporting operating procedures for the pre-filling inspection of gas cylinder filling operations. However, in actual operation, it is difficult to persevere or cannot be implemented at all due to the "tedious and repetitive" operations, and most of them are just formalities. In particular, the qualitative analysis and evacuation of the remaining gas in the oxygen cylinder are relatively trivial. Many filling units (stations) basically do not have this operation link, which lays the foundation for wrong filling and mixed filling. Summary of the invention

[0005] The present invention provides a gas cylinder mis-filling prevention control system and control method, and the technical solution effectively overcomes the problems of difficult implementation and unstable operation management in current gas cylinder filling operations.

[0006] In a first aspect, the present invention provides a gas cylinder mis-filling prevention control system, comprising: a main gas filling pipeline, a first filling mechanism, a second filling mechanism, a venting mechanism, an evacuation mechanism, and an evacuation detection mechanism. The first filling mechanism and the second filling mechanism are both connected to the main gas filling pipeline via a filling valve. The first filling mechanism and the second filling mechanism are both connected to the inlet of the venting valve of the venting mechanism via an isolation valve. The evacuation control valve of the evacuation mechanism is connected to the outlet of the isolation valve of the second filling mechanism. The evacuation detection mechanism is connected to the inlet of the venting valve.

[0007] Optionally, the connection port of the first filling mechanism and the connection port of the second filling mechanism are connected to the inflation main pipeline through a first pipeline and a second pipeline respectively, and the filling valve is provided on the first pipeline and the second pipeline.

[0008] By adopting the above technical solution, the connection and disconnection between the first filling mechanism, the second filling mechanism and the inflation main pipeline can be controlled as needed, which facilitates the coordinated work of the two groups of filling mechanisms and improves work efficiency.

[0009] Optionally, the connection port of the first filling mechanism and the connection port of the second filling mechanism are connected to the inlet of the vent valve of the vent mechanism through a third pipeline and a fourth pipeline respectively, and the isolation valve is provided on the third pipeline and the fourth pipeline.

[0010] By adopting the above-mentioned technical scheme, the first filling mechanism can be connected to the fourth pipeline, so that the first filling mechanism and the second filling mechanism can share a set of evacuation mechanisms, which effectively simplifies the structure of the gas cylinder anti-misfilling control system of the present invention, reduces the operating difficulty, and improves the operability of the gas cylinder filling operation.

[0011] Optionally, the evacuation mechanism is connected to the fourth pipeline through a fifth pipeline, and the evacuation control valve is arranged on the fifth pipeline.

[0012] By adopting the above technical solution, the purpose of enabling the first filling mechanism and the second filling mechanism to share a set of evacuation mechanisms is achieved, so that by controlling the on and off of the isolation valves on the third pipeline and the fourth pipeline, the evacuation processes of the first filling mechanism and the second filling mechanism can be quickly switched, which facilitates the coordinated work of the two groups of filling mechanisms and improves work efficiency.

[0013] Optionally, the filling valve, isolation valve, vent valve and evacuation control valve are all solenoid valves, and the solenoid valves are connected to a controller.

[0014] By adopting the above technical solution, it is convenient to use the controller to accurately and automatically control the on and off status and on and off time of each valve, reduce labor intensity, improve efficiency, and help avoid problems such as unstable and difficult to manage operation and control by personnel.

[0015] Optionally, the first filling mechanism and the second filling mechanism both include a gas inlet and outlet pipe and a pressure detector, and the pressure detector is arranged on the gas inlet and outlet pipe. One end of the inlet and outlet pipe is used to connect to the main gas charging pipeline, and the other end of the inlet and outlet pipe is used to connect to the gas cylinder to be processed.

[0016] By adopting the above technical solution, the pressure change in the gas cylinder can be monitored when the gas cylinder is emptied, evacuated or filled / replaced, ensuring that the relevant operation is stopped in time or switched to the next operation after the pressure in the gas cylinder reaches the set requirement, thereby preventing abnormal pressure in the gas cylinder.

[0017] Optionally, the pressure detector is connected to an alarm device via the controller.

[0018] By adopting the above technical solution, it is convenient to perform the filling / replacement operation on the gas cylinder that has been evacuated and qualified. When the pressure detector detects that the pressure in the gas cylinder has reached the set pressure, the alarm device will prompt, stop inflating the gas cylinder, and switch to inflating other gas cylinders to be inflated.

[0019] Optionally, the evacuation mechanism includes a negative pressure device or a vacuum device to discharge the gas in the gas cylinder connected to the first filling mechanism or the second filling mechanism as much as possible, reduce the residual gas therein, especially oxygen, etc., avoid affecting the purity of the subsequently filled gas, or even forming an explosive mixture with oxygen.

[0020] Optionally, the evacuation detection mechanism is a gas concentration detector. By detecting the gas concentration in the gas cylinder after evacuation, it is determined whether the evacuation is qualified. If it is unqualified, evacuation is performed again. If it is qualified, the next process is entered.

[0021] In a second aspect, the present invention provides a gas cylinder mis-filling control method, which adopts the following technical solution:

[0022] A gas cylinder mis-filling prevention control method comprises the following steps:

[0023] S1. Open the isolation valve between the first filling mechanism and the venting valve to vent the remaining gas in the gas cylinder connected to the first filling mechanism.

[0024] S2. After S1 is completed, the venting valve is closed, and the evacuation mechanism and the evacuation control valve are opened to evacuate the evacuated gas cylinder.

[0025] S3. After S2 is completed, the evacuation mechanism and the evacuation control valve are closed, and the evacuation detection mechanism is opened to detect the evacuation condition of the evacuated gas cylinder.

[0026] S4. After the test of S3 is qualified, close the vacuum detection mechanism and the isolation valve, open the filling valve between the main gas pipeline and the first filling mechanism, and fill or replace the gas cylinder that has passed the vacuum. While performing the filling or replacement operation, perform the above-mentioned S1 to S3 operations on the gas cylinder connected to the second filling mechanism. When the gas cylinder completes the above-mentioned operations, perform the above-mentioned filling or replacement operation. At the same time, perform the above-mentioned S1 to S3 operations on the new gas cylinder on the first filling mechanism. This reciprocating cycle allows the first filling mechanism and the second filling mechanism to work simultaneously.

[0027] In a third aspect, the present invention provides a joint for charging and discharging the gas cylinder, which comprises: an upper shell, a lower shell, an adjusting screw, a fixing plate, a vent pipe, a limiting plate, a plug, a spring and a push rod. Wherein: the upper shell has an upper chamber, and the side of the upper chamber has an inlet and outlet for filling or discharging gas. The lower shell has a lower chamber, and the lower port of the lower chamber is open. The upper shell is superimposed on the lower shell and the two are sealed and connected, the lower port of the upper chamber is connected to the upper port of the lower chamber, and a necking port is formed at the connection between the two. The lower end of the adjusting screw passes through the top surface of the upper shell and is located in the upper chamber, and the adjusting screw is threadedly connected to the upper shell to facilitate the adjustment of the length of the adjusting screw entering the upper chamber. The fixing plate is fixed to the lower part of the lower chamber, the lower end of the vent pipe is movably passed through the fixing plate and is located at the lower part of the lower chamber, and the limiting plate is fixed to the lower end side wall of the vent pipe. The plug is fixed on the upper side wall of the vent pipe, the spring is sleeved on the vent pipe and limited between the limit plate and the plug, and the plug is pressed and blocked in the necking opening by the spring. The lower end of the push rod is fixed on the sealed upper end surface of the vent pipe, the upper end of the push rod is limited in the lower end inner cavity of the adjusting screw, and the push rod is rotatably connected to the adjusting screw.

[0028] Furthermore, the upper end of the push rod has a clamping head, which is limited in the lower end inner cavity of the adjusting screw, and the height of the lower end inner cavity is greater than the height of the clamping head, so that when inflating, the adjustment screw can be rotated downward to release the restriction on the blocking component composed of the fixing plate, vent pipe, limit plate, plug, spring and push rod. After the inflation is released, the adjustment screw can be rotated upward to make the blocking component form a reinforced seal on the necking port to prevent the problem of blocking failure caused by spring failure.

[0029] Furthermore, a plurality of ventilation holes are provided on the side wall of the ventilation pipe, and the lower end of the ventilation pipe is open to facilitate sufficient circulation of gas.

[0030] Furthermore, a sealing ring is provided between the upper shell and the side wall of the adjusting screw to increase the sealing performance between the two.

[0031] Furthermore, the lower shell is fixedly connected to the seal head of the gas cylinder, and the lower port of the lower chamber is communicated with the inner cavity of the gas cylinder.

[0032] In summary, the present invention includes at least one of the following beneficial technical effects:

[0033] 1. The gas cylinder mis-filling prevention control system of the present invention sets two groups of charging mechanisms and completes the whole process from venting before filling the gas cylinder to setting the filling pressure through the control of valves set at specific positions, which significantly reduces the operational difficulty of the gas cylinder filling operation, improves the operability of the gas cylinder filling operation, and overcomes the problems of the current gas cylinder filling operation that is difficult to implement and the unstable operation management.

[0034] 2. The gas cylinder mis-filling prevention control system of the present invention can utilize the control of valves at specific positions to enable the two groups of inflation mechanisms and the venting mechanism, the evacuation mechanism, and the evacuation detection mechanism to cooperate with each other, thereby realizing continuous switching of the two groups of inflation mechanisms, thereby continuously performing the entire process from venting before filling the gas cylinder to the end of filling pressure setting, thereby improving work efficiency by more than 40%, with significant results.

[0035] 3. The present invention also provides a joint connected to the sealing head of the gas cylinder for charging and deflating the gas cylinder. This joint not only integrates the functions of charging and deflating, but also can release the restriction on the blocking component by rotating the adjusting screw downward during charging. After charging is released, the adjusting screw can be rotated upward to make the blocking component form a reinforced seal on the necking port, thereby preventing the problem of blocking failure caused by spring failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0037] Figure 1 2 is a schematic diagram of the structure of a gas cylinder mis-filling prevention control system according to an embodiment of the present invention;

[0038] Figure 2 Schematic diagram of the gas cylinder error-filling prevention control system according to the embodiment of the present invention when executing the gas cylinder emptying process;

[0039] Figure 3 Schematic diagram of the gas cylinder anti-mischarge control system according to the embodiment of the present invention when executing the gas cylinder evacuation process;

[0040] Figure 4 Schematic diagram of the gas cylinder error-filling prevention control system according to the embodiment of the present invention when executing the gas cylinder emptying condition detection process;

[0041] Figure 5Schematic diagram of the gas cylinder mis-filling prevention control system according to the embodiment of the present invention when executing a gas filling or replacement process;

[0042] Figure 6 is a schematic structural diagram of a joint for charging and discharging a gas cylinder in an embodiment of the present invention;

[0043] Figure 7 It is a schematic structural diagram of a joint for charging and discharging a gas cylinder after the restriction of the plug is removed in an embodiment of the present invention;

[0044] Figure 8 is a schematic diagram of a joint for charging and discharging a gas cylinder during gas inlet in an embodiment of the present invention;

[0045] Fig. 9 It is a schematic diagram of the joint for charging and discharging gas of a gas cylinder in an embodiment of the present invention when exhausting gas.

[0046] Explanation of the accompanying reference numerals: 1. main inflation pipeline; 2. first filling mechanism; 3. second filling mechanism; 4. venting mechanism; 5. vacuum mechanism; 6. vacuum detection mechanism; 7. filling valve; 8. isolation valve; 9. venting valve; 10. vacuum control valve; 11. first pipeline; 12. second pipeline; 13. third pipeline; 14. fourth pipeline; 15. fifth pipeline; 16. upper shell; 1601. upper chamber; 1602. inlet and outlet; 17. lower shell; 1701. lower chamber; 1702. necking mouth; 18. adjusting screw; 19. fixing plate; 20. vent pipe; 21. limit plate; 22. plug; 23. spring; 24. ejector rod; 2401. clamp; 25. sealing ring; 26. gas cylinder. DETAILED DESCRIPTION

[0047] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. For example, the words "upper", "lower", "left" and "right" appearing in the present invention only indicate that they are consistent with the upper, lower, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the equipment or components referred to need to have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0048] The gas cylinder mis-filling prevention control system and control method of the present invention are further described in conjunction with the accompanying drawings and specific implementation methods of the specification.

[0049] refer to Figure 1 , an example of a gas cylinder anti-misfilling control system is provided, comprising: a filling main pipeline 1, a first filling mechanism 2, a second filling mechanism 3, a venting mechanism 4, a vacuuming mechanism 5, and a vacuuming detection mechanism 6.

[0050] The main inflation pipe 1 is a pipe used to fill or replace gas into the gas cylinders correspondingly connected to the first filling mechanism 2 and the second filling mechanism 3. Therefore, one end of the main inflation pipe 1 needs to be connected to a gas source. It should be noted that the gas source can be the same gas as the original gas in the gas cylinder, or it can be different. When the gas source and the original gas in the gas cylinder are the same, the process of filling the gas source into the gas cylinder is called filling. When the gas source and the original gas in the gas cylinder are different, the process of filling the gas source into the gas cylinder is called replacement, that is, filling the gas cylinder with another gas.

[0051] Therefore, in order to ensure the purity of the gas filled in the gas cylinder and avoid mixing with other impurity gases, especially oxygen which is easy to form explosive gas after mixing with combustible gas, when the gas cylinder is filled or replaced by the gas filling main pipeline 1, the residual gas in the gas cylinder needs to be removed as much as possible by the above-mentioned venting mechanism 4 and evacuation mechanism 5, and the evacuation detection mechanism 6 needs to detect whether the original gas remaining in the gas cylinder has been removed to the set requirements.

[0052] In order to fill the gas in the gas source into the gas cylinder, the main gas charging pipeline 1 may be provided with a power mechanism, such as but not limited to a cryogenic liquid pump, which is mainly used to transport cryogenic liquids such as liquid oxygen, liquid nitrogen, liquid argon, liquid hydrocarbons, and liquefied natural gas. Furthermore, a pressure detection device such as a pressure gauge may be provided on the main gas charging pipeline 1 to monitor whether the pressure in the main gas charging pipeline 1 is normal.

[0053] The first filling mechanism 2 and the second filling mechanism 3 are two sets of mechanisms arranged in parallel for connecting the gas cylinders to be processed. In this embodiment, the filling mechanism includes a pressure pipe and an interface connected to one end of the pressure pipe for connecting with the gas cylinder. The pressure pipe is used to fill the gas cylinder with gas and to remove the remaining gas in the gas cylinder. It also includes a pressure detection device such as a pressure gauge arranged on the pressure pipe to detect the gas pressure in the gas cylinder when the gas cylinder is filled or replaced. When the set pressure is reached, the filling or replacement operation needs to be stopped.

[0054] The other end of the pressure pipe of the first filling mechanism 2 is connected to the outlet of the main gas-charging pipe 1 through the first pipe 11, and the first pipe 11 is provided with the filling valve 7. Similarly, the other end of the pressure pipe of the second filling mechanism 3 is connected to the outlet of the main gas-charging pipe 1 through the second pipe 12, and the second pipe 12 is also provided with the filling valve 7. The filling valve 7 is usually a valve for controlling the on-off of liquid or gas in the pipe, and is used for on-off control between the corresponding filling mechanism and the main gas-charging pipe 1, so that after the gas cylinder connected to the first filling mechanism 2 or the second filling mechanism 3 is evacuated and qualified, the corresponding filling valve 7 is opened to connect the main gas-charging pipe 1 with the filling mechanism for filling or replacement of gas. At the same time, by controlling the on-off of the two filling valves 7 at different times, one of the first filling mechanism 2 and the second filling mechanism 3 performs the filling or replacement of the gas in the corresponding gas cylinder, while the other performs the remaining venting, evacuation, and evacuation detection steps on its gas cylinder, thereby enabling the two groups of filling mechanisms to work together, realize the continuous switching of the two groups of gas filling mechanisms, and continuously perform the entire process from venting before filling the gas cylinder to the end of setting the filling pressure. The test results show that the above process improves the work efficiency by more than 40%, with significant effects.

[0055] The other end of the pressure pipeline of the first filling mechanism 2 is also connected to the vent valve 9 of the venting mechanism 4 through the third pipeline 13. The other end of the pressure pipeline of the second filling mechanism 3 is connected to the vent valve 9 of the venting mechanism 4 through the fourth pipeline 14. Isolation valves 8 are provided on the third pipeline 13 and the fourth pipeline 14. The isolation valve 8 is usually also a valve that controls the on-off of liquid or gas in the pipeline, and is used to control the on-off of the third pipeline 13 and the fourth pipeline 14. Optionally, the other end of the pressure pipeline is connected to a three-way joint or a structure with similar functions, so as to meet the technical requirement that the port of the pressure pipeline needs to be connected to two pipelines at the same time. Other places in this embodiment that are similar to the technical requirements can also be implemented in the above manner.

[0056] The above-mentioned venting mechanism 4 is mainly used to release the residual gas in the gas cylinder. When the filling valve 7, the isolation valve 8 and the venting valve 9 are opened, the gas cylinder can be connected to the venting mechanism 4, and the gas in the gas cylinder can be discharged through the corresponding pipes and valves. Figure 1 When the gas cylinder on the first filling mechanism 2 needs to be emptied first, the filling valve 7 on the first pipeline 11 and the isolation valve 8 on the third pipeline 13 are opened, and the venting valve 9 is opened at the same time, so that the residual gas in the gas cylinder on the first filling mechanism 2 can be discharged. Optionally, the venting mechanism 4 is composed of a discharge pipeline provided with the venting valve 9, and one end of the discharge pipeline has a four-way pipe, and its four interfaces are respectively connected to the discharge pipeline, the third pipeline 13, the fourth pipeline 14, and the vacuum detection mechanism 6.

[0057] Furthermore, since the venting cannot completely exhaust the gas remaining in the gas cylinder, additional measures need to be taken to overcome the above problem. Therefore, the evacuation mechanism 5 is also provided, and the evacuation mechanism 5 is connected to the fourth pipeline 14 through the fifth pipeline 15. Optionally, the evacuation mechanism includes a negative pressure device or a vacuum device, so as to exhaust the gas in the gas cylinder connected to the first filling mechanism 2 or the second filling mechanism 3 as much as possible, reduce the residual gas therein, especially the residual oxygen, etc., to avoid affecting the purity of the subsequent filling gas, or even forming an explosive mixed gas with oxygen.

[0058] It should be noted that, through the setting of the above connection relationship, the first filling mechanism 2 and the second filling mechanism 3 can share a set of evacuation mechanisms 5, so that by controlling the on and off of the isolation valve 8 on the third pipeline 13 and the fourth pipeline 14, the first filling mechanism 2 and the second filling mechanism 3 can be quickly switched to facilitate the coordinated work of the two groups of filling mechanisms and improve work efficiency. At the same time, the structure of the gas cylinder anti-mischarge control system is greatly simplified, the difficulty of operation is reduced, and the operability of the gas cylinder filling operation is improved.

[0059] The fifth pipeline 15 is provided with an evacuation control valve 10 so as to block the fourth pipeline 14 and the evacuation mechanism 5 when the gas cylinder on the second filling mechanism 3 is emptied through the fourth pipeline 14 .

[0060] After the evacuation of the gas cylinder is completed, it is also necessary to detect the evacuation effect to ensure that the residual gas in the gas cylinder meets the standard. For this purpose, the evacuation detection mechanism 6 is also set up. The evacuation detection mechanism is a gas concentration detector, such as an oxygen concentration detector, which is used to detect the oxygen concentration in the gas cylinder to avoid the residual oxygen concentration in the gas cylinder being too high, which affects the purity of the gas in the gas cylinder after subsequent filling. The evacuation detection mechanism 6 is connected to the intersection of the discharge pipe, the third pipe 13, and the fourth pipe 14, so that the control and coordination of other pipes and valves can be used to conveniently and quickly perform evacuation detection, eliminating the complexity of the structure of the gas cylinder anti-misfilling control system and the hysteresis of the detection caused by setting up additional pipes and other structures, which helps to reduce the difficulty of operation, improve the operability of the gas cylinder filling operation, and improve the efficiency of the filling operation.

[0061] In another embodiment, the filling valve 7, isolation valve 8, vent valve 9, and evacuation control valve 10 in the gas cylinder mis-filling prevention control system are all automated valves that can be controlled by a controller, such as solenoid valves. By adopting the above technical solution, it is convenient to use the controller to accurately and automatically control the on-off state and on-off time of each valve, reduce the labor intensity of gas cylinder filling operations, improve efficiency, and help avoid the problem of unstable and difficult management of personnel operation control.

[0062] In another embodiment, in the above-mentioned gas cylinder mis-filling prevention control system, the pressure detectors provided on the pressure pipes of the first filling mechanism 2 and the second filling mechanism 3 are connected to the alarm device through a controller. By adopting the above-mentioned technical solution, when the filling / replacement operation is performed on the gas cylinder that has passed the evacuation, when the pressure detector detects that the pressure in the gas cylinder has reached the set pressure, the alarm device will give a prompt, and stop inflating the gas cylinder, and switch to inflating other gas cylinders to be inflated.

[0063] In another embodiment, the control system for preventing wrong filling of gas cylinders in the control method exemplified in the above-mentioned embodiment is used as an actuator, and an example of a control method for preventing wrong filling of gas cylinders is given. This method realizes the continuous switching of the two groups of gas filling mechanisms by utilizing the control of valves in specific positions to enable the two groups of gas filling mechanisms and the venting mechanism, the vacuum mechanism, and the vacuum detection mechanism to cooperate with each other, thereby continuously performing the entire process from venting before filling the gas cylinder to the end of setting the filling pressure, thereby greatly improving work efficiency, simplifying the process of gas cylinder filling operations, and improving the operability of gas cylinder filling operations, effectively overcoming the problems of difficult implementation and unstable operation management in current gas cylinder filling operations.

[0064] Specifically, refer to Figures 2 to 5 , wherein the arrow indicates the flow direction of the gas, the control method comprises the following steps:

[0065] First, the isolation valve 8 between the first filling mechanism 2 and the venting valve 9 is opened, that is, the isolation valve 8 on the third pipeline 13 is opened, and the venting valve 9 is opened at the same time, so that the first filling mechanism 2 is connected to the venting mechanism 5, so that the gas in the gas cylinder connected to the pressure pipeline of the first filling mechanism 2 is discharged by itself using the residual pressure. When the pressure gauge on the pressure pipeline detects that the pressure in the gas cylinder has returned to normal pressure, the venting process can be stopped. At this time, the pressure inside and outside the gas cylinder is equal, and the residual gas in the gas cylinder cannot be discharged naturally.

[0066] Then, the vent valve 9 is closed, the evacuation mechanism 5 and the evacuation control valve 10 are opened, and the evacuated gas cylinder is evacuated, and the residual gas in the gas cylinder is discharged using the negative pressure condition provided by the evacuation mechanism 5. After the pressure gauge on the pressure pipe detects that the pressure in the gas cylinder reaches the set value, the evacuation mechanism 5 stops the evacuation process and the evacuation control valve 10 is closed.

[0067] At the same time, the evacuation detection mechanism 6 is turned on to detect the evacuation status of the evacuated gas cylinder. If the detection fails, the evacuation process is repeated. If the detection passes, the evacuation detection mechanism 6 and the isolation valve 8 are closed, and the filling valve 7 on the first pipeline 11 between the main gas filling pipeline 1 and the first filling mechanism 2 is opened to fill or replace the gas cylinder that has passed the evacuation.

[0068] refer to Figure 5While performing the filling or replacement operation, the gas cylinder connected to the second filling mechanism 3 is emptied, evacuated, and tested. When the gas cylinder completes the above operations, the filling or replacement operation is performed. At the same time, the new gas cylinder on the first filling mechanism 2 is emptied, evacuated, and tested. This reciprocating cycle allows the first filling mechanism 2 and the second filling mechanism 3 to work simultaneously.

[0069] refer to Figure 6 In this embodiment, a joint for charging and discharging the above-mentioned gas cylinder is provided, which includes: an upper shell 16, a lower shell 17, an adjusting screw 18, a fixing plate 19, a vent pipe 20, a limiting plate 21, a plug 22, a spring 23 and a push rod 24. Among them:

[0070] The upper shell 16 has an upper chamber 1601 therein, and the side of the upper chamber 1601 has an inlet and outlet 1602, which is used to connect to the gas charging and discharging pipelines so as to charge or discharge the gas.

[0071] The lower shell 17 has a lower chamber 1701, and the lower end of the lower chamber 1701 is open. When in use, the lower shell 17 is fixedly connected to the end cap of the gas cylinder 26, and the lower end of the lower chamber 1701 is communicated with the inner cavity of the gas cylinder 26.

[0072] The upper shell 16 is superimposed on the lower shell 17 and the two are sealed and connected. The lower port of the upper chamber 1601 is connected to the upper port of the lower chamber 1701, and a necking opening 1702 is formed at the connection between the two, so that the above-mentioned plug 22 can form a pressurized seal on the necking opening 1702.

[0073] The lower end of the adjusting screw 18 passes through the top surface of the upper shell 16 and is located in the upper chamber 1601, and the adjusting screw 18 is threadedly connected to the upper shell 1, so as to adjust the length of the adjusting screw 18 entering the upper chamber 1601. In a more preferred embodiment, a rubber sealing ring 25 is provided between the upper shell 16 and the side wall of the adjusting screw 18 to increase the sealing between the two.

[0074] The fixing plate 19 is fixed horizontally at the lower part of the lower chamber 1701. The side wall of the vent pipe 20 has a plurality of vent holes, and the lower end of the vent pipe 20 is open to facilitate the full circulation of gas; the upper end of the vent pipe 20 is closed. The lower end of the vent pipe 20 is located at the lower part of the lower chamber 1701 after passing through the fixing plate 19, and the limit plate 21 is fixed on the lower end side wall of the vent pipe 20.

[0075] The plug 22 is made of rubber or other materials, and is fixed on the upper side wall of the vent pipe 20. The spring 23 is sleeved on the vent pipe 20 and limited between the limit plate 21 and the plug 22, and the plug 22 is pressed by the spring 2 to be blocked in the neck opening 1702. By setting the vent pipe 20 and the fixing plate 19 in a movable connection, and the spring 23 providing elastic support to the vent pipe 20, the neck opening 1702 can be blocked or opened by the up / down movement, and the gas flow can be achieved at the same time.

[0076] The lower end of the push rod 24 is fixed on the sealed upper end surface of the vent pipe 20, and the upper end of the push rod 24 has a clamp 2401, which is located in the lower end inner cavity of the adjusting screw 18, and the clamp 2401 is limited in the lower end inner cavity of the adjusting screw 18, and the push rod 24 is rotatably connected with the adjusting screw 18. The height of the lower end inner cavity is greater than the height of the clamp 2401, so that when inflating, the adjustment screw 18 can be rotated downward to release the restriction on the blocking component composed of the 18, the fixing plate 19, the vent pipe 20, the limiting plate 21, the plug 22, the spring 23 and the push rod 24. After the inflation is released, the adjustment screw 18 can be rotated upward to make the blocking component form a reinforced seal on the necking port 1702 to prevent the problem of blocking failure caused by the failure of the spring 23.

[0077] When the above-mentioned joint for charging and discharging gas of the gas cylinder 26 is used, refer to Figure 6 As shown in the arrow, at this time, the adjusting screw 18 rises a certain distance to form a lifting effect on the push rod 24, and the plug 22 is tightly sealed at the necking opening 1702 under the dual action of the spring 23 and the adjusting screw 18. Moreover, since the adjusting screw 18 has a limiting effect, even if the spring 23 fails due to aging, breakage, etc., the plug 22 can still be tightly sealed at the necking opening 1702, avoiding the problem of leakage caused by the failure of the spring 23. When it is necessary to inflate the joint, refer to Figure 7 , Figure 8 and the arrow therein, the adjusting screw 18 is adjusted downward to release the restriction on the plug 22, and when the high-pressure gas enters the upper chamber 1601 from the inlet and outlet 1602, the plug 22 is pressed downward to release the blockage of the neck opening 1702, and the gas enters the lower chamber 1701 and then is discharged through the vent pipe 20 and enters the gas cylinder 26 to complete the inflation. After the inflation is completed, the plug 22 automatically returns to Figure 7 The state shown in FIG. 1 can be further strengthened by adjusting the adjusting screw 18 upward. When the gas in the gas cylinder 26 needs to be released, refer to Fig. 9As shown by the arrow, adjust the adjusting screw 18 downward until the plug 22 is withdrawn from the necking opening 1702, and the gas in the gas cylinder 26 can be discharged through the above-mentioned vent pipe 20, the necking opening 1702, the upper chamber 1601, and the inlet and outlet 1602.

[0078] Finally, it should be noted that any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the above describes the specific implementation of the present invention in conjunction with the drawings, it is not a limitation on the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, various modifications, deformations, equivalent deformations, etc. that can be made by those skilled in the art without creative labor are still within the protection scope of the present invention.

Claims

1. A gas cylinder mis-filling prevention control system, characterized in that: include: An inflation main pipeline, a first filling mechanism, a second filling mechanism, a venting mechanism, an evacuation mechanism, and an evacuation detection mechanism; wherein the first filling mechanism and the second filling mechanism are both connected to the inflation main pipeline through a filling valve; the first filling mechanism and the second filling mechanism are both connected to the inlet of the evacuation valve of the evacuation mechanism through an isolation valve; the evacuation control valve of the evacuation mechanism is connected to the outlet of the isolation valve of the second filling mechanism; the evacuation detection mechanism is connected to the inlet of the evacuation valve; It also includes a joint for charging and discharging the gas cylinder, which includes: an upper shell, a lower shell, an adjusting screw, a fixing plate, a vent pipe, a limit plate, a plug, a spring and a push rod; wherein: the upper shell has an upper chamber, and the side of the upper chamber has an inlet and outlet; the lower shell has a lower chamber, and the lower port of the lower chamber is open; the upper shell is superimposed on the lower shell and the two are sealed and connected, the lower port of the upper chamber is connected to the upper port of the lower chamber, and a neck is formed at the connection between the two; the lower end of the adjusting screw passes through the top surface of the upper shell and is located in the upper chamber, and the adjusting screw The rod is threadedly connected to the upper shell; the fixing plate is fixed to the lower part of the lower chamber, the lower end of the ventilation pipe is movable through the fixing plate and is located at the lower part of the lower chamber, and the limiting plate is fixed to the lower end side wall of the ventilation pipe; the plug is fixed to the upper end side wall of the ventilation pipe, the spring is sleeved on the ventilation pipe and limited between the limiting plate and the plug, and the plug is pressed and sealed in the necking mouth by the spring; the lower end of the push rod is fixed to the closed upper end surface of the ventilation pipe, the upper end of the push rod is limited in the lower end inner cavity of the adjusting screw, and the push rod is rotationally connected to the adjusting screw; The upper end of the push rod has a clamping head, and the clamping head is limited in the inner cavity of the lower end of the adjusting screw, and the height of the inner cavity of the lower end is greater than the height of the clamping head; The side wall of the ventilation pipe is provided with a plurality of ventilation holes, and the lower end of the ventilation pipe is open; A sealing ring is provided between the upper housing and the side wall of the adjusting screw; The lower shell is fixedly connected to the sealing head of the gas cylinder, and the lower port of the lower chamber is communicated with the inner cavity of the gas cylinder.

2. The gas cylinder mis-filling prevention control system according to claim 1, characterized in that: The connection port of the first filling mechanism and the connection port of the second filling mechanism are connected to the main inflation pipeline through the first pipeline and the second pipeline respectively, and the first pipeline and the second pipeline are both provided with the filling valve.

3. The gas cylinder mis-filling prevention control system according to claim 2, characterized in that: The connection port of the first filling mechanism and the connection port of the second filling mechanism are connected to the inlet of the vent valve of the vent mechanism through the third pipeline and the fourth pipeline respectively, and the isolation valve is arranged on the third pipeline and the fourth pipeline.

4. The gas cylinder mis-filling prevention control system according to claim 3, characterized in that: The evacuation mechanism is connected to the fourth pipeline through a fifth pipeline, and the evacuation control valve is arranged on the fifth pipeline.

5. The gas cylinder mis-filling prevention control system according to claim 1, characterized in that: The first filling mechanism and the second filling mechanism both include a gas inlet and outlet pipe and a pressure detector, wherein the pressure detector is arranged on the gas inlet and outlet pipe; one end of the inlet and outlet pipe is used to connect to the main gas filling pipe, and the other end of the inlet and outlet pipe is used to connect to the gas cylinder; The pressure detector is connected to the alarm device through a controller.

6. The gas cylinder mis-filling prevention control system according to any one of claims 1 to 5, characterized in that: The evacuation mechanism includes a negative pressure device or a vacuum device; The evacuation detection mechanism is a gas concentration detector; The charging valve, the isolating valve, the venting valve and the evacuation control valve are all solenoid valves, and the solenoid valves are connected to a controller.

7. A gas cylinder mis-filling control method, characterized in that: The gas cylinder mis-filling prevention control system according to any one of claims 1 to 6 is used as an actuator, and the control method includes: S1. Open the isolation valve between the first filling mechanism and the venting valve to vent the remaining gas in the gas cylinder connected to the first filling mechanism; S2, after S1 is completed, close the vent valve, open the evacuation mechanism and the evacuation control valve, and evacuate the evacuated gas cylinder; S3, after the completion of S2, the evacuation mechanism and the evacuation control valve are closed, and the evacuation detection mechanism is opened to detect the evacuation condition of the evacuated gas cylinder; S4, after the test of S3 is passed, the evacuation detection mechanism and the isolation valve are closed, the filling valve between the inflation main pipeline and the first filling mechanism is opened, and the gas cylinder that has passed the evacuation is filled with gas or replaced with gas; While executing the filling or replacement operation, the above-mentioned operations S1 to S3 are performed on the gas cylinder connected to the second filling mechanism. When the above-mentioned operations are completed on the gas cylinder, the above-mentioned filling or replacement operation is performed; at the same time, the above-mentioned operations S1 to S3 are performed on the new gas cylinder on the first filling mechanism; and this reciprocating cycle is repeated so that the first filling mechanism and the second filling mechanism work simultaneously.

Images