Medical intelligent sterilization gas filling system and method

Abstract

The application discloses a medical intelligent sterilization gas filling system and method, which comprises a control system and a filling pipeline. The filling pipeline comprises a gas phase channel and a liquid phase channel. The gas phase channel is used for adjusting the gas pressure of the pipeline, discharging oxygen in the pipeline and recovering excessive filling gas. Control valves controlled by the control system are arranged on the gas phase channel and the liquid phase channel. The gas phase channel is connected to a gas cylinder in sequence after being connected with a gas phase conveying pipeline, a gas phase filling hose, a gas return valve and a first cylinder valve. A pressure monitoring device in communication connection with the control system is further arranged on the gas phase channel and used for monitoring the pressure condition of the pipeline. The liquid phase channel is used for filling sterilization gas EO into the gas cylinder. The liquid phase channel is connected to the gas cylinder in sequence after being connected with a liquid phase filling hose, a liquid inlet valve and a second cylinder valve. The valves of the pipelines are intelligently controlled, the filling safety is ensured, the fault tolerance is improved, and the risk caused by valve leakage to the human body is reduced.

Description

Technical Field

[0001] This invention relates to the field of industrial gas filling technology, specifically to a medical intelligent sterilization gas filling system and method. Background Technology

[0002] Ethylene oxide (EO) is an important organic chemical raw material, crucial for the production of surfactants, lubricants, resins, adhesives, and other products. Its chemical formula is C2H4O. It is a colorless, transparent liquid. In the medical and health field, ethylene oxide is commonly used as a sterilizing gas for instrument disinfection and surgical instruments. However, ethylene oxide has a low boiling point and possesses certain toxicity, corrosiveness, and flammability. It reacts violently with oxygen, posing a health hazard. Therefore, appropriate materials and methods must be selected during its preparation, production, and filling processes to avoid the risks associated with ethylene oxide contact with oxygen. Furthermore, ethylene oxide leakage can affect human health, necessitating reduced manual operation. Consequently, an intelligent filling system for medical sterilizing gases capable of intelligently filling ethylene oxide is needed. Summary of the Invention

[0003] The purpose of this invention is to provide a medical intelligent sterilization gas filling system and filling method, which keeps the pipeline of the filling system oxygen-free, ensures filling safety, and improves the fault tolerance rate and reduces the risk to the human body caused by valve leakage by intelligently controlling the valves of each pipeline.

[0004] To achieve the above objectives, this application provides the following solution: On one hand, this application provides a medical intelligent sterilization gas filling system, including a control system and a filling pipeline. The filling pipeline includes a gas phase channel and a liquid phase channel. The gas phase channel is used to regulate the pipeline pressure, discharge oxygen from the pipeline, and recover excess filling gas. Both the gas phase channel and the liquid phase channel are equipped with control valves that are remotely controlled by the control system. The gas phase channel is connected in sequence to a gas phase delivery pipeline, a gas phase filling hose, a return valve, and a first cylinder valve before connecting to a gas cylinder. The gas phase channel is also equipped with a pressure monitoring device that is communicatively connected to the control system to monitor the pressure of the pipeline. The liquid phase channel is used to fill the gas cylinder with sterilization gas EO. The liquid phase channel is connected in sequence to a liquid phase filling hose, an inlet valve, and a second cylinder valve before connecting to the gas cylinder.

[0005] In some specific embodiments, the gas phase channel includes a gas phase vacuum line, a gas phase venting line, a nitrogen pressurization line, and a mixed gas cylinder filling-return line, all of which are connected to the gas phase delivery pipeline. Each line is equipped with a control valve that is remotely controlled by the control system to control the connection between the line and the gas phase delivery pipeline. The gas phase delivery pipeline is connected in sequence to the gas phase filling hose, the return valve, and the first cylinder valve before being connected to the gas cylinder. A pressure monitoring device is installed on the nitrogen pressurization line.

[0006] In some specific implementations, one end of the gas phase vacuuming pipeline is connected to a gas phase vacuuming device, and the other end is connected to a gas phase vacuum automatic control valve and then connected to a gas phase delivery pipeline. One end of the gas phase venting pipeline is connected to a gas phase venting device, and the other end is connected to a first check valve and a gas phase venting automatic control valve in sequence and then connected to a gas phase delivery pipeline. One end of the mixed gas cylinder filling-return pipeline is connected to a return gas device, and the other end is connected to a second check valve and a return gas automatic control valve in sequence and then connected to a gas phase delivery pipeline. An oxygen content analyzer that communicates with the control system is installed on the mixed gas cylinder filling-return pipeline. One end of the nitrogen pressurization pipeline is connected to a gas phase N2 supply system, and the other end is connected to a gas phase nitrogen automatic control valve and a third check valve in sequence and then connected to a gas phase delivery pipeline. The pressure monitoring device is installed on the pipeline at the output end of the third check valve.

[0007] In some specific embodiments, the liquid phase channel includes a liquid phase vacuum pipeline, a liquid phase venting pipeline, a nitrogen supply pipeline, and an EO filling pipeline, all of which are connected to the liquid phase delivery pipeline. Each pipeline is equipped with a control valve that is remotely controlled by the control system to control the connection between the pipeline and the liquid phase delivery pipeline. The liquid phase delivery pipeline is connected in sequence to the liquid phase filling hose, the liquid inlet valve, and the second cylinder valve before being connected to the gas cylinder.

[0008] In some specific embodiments, one end of the nitrogen supply pipeline is connected to the liquid phase N2 supply system, and the other end is connected to the liquid phase nitrogen automatic control valve and the fourth check valve in sequence before being connected to the liquid phase delivery pipeline; one end of the EO filling pipeline is connected to the EO filling equipment, and the other end is connected to the EO filling automatic control valve and the fifth check valve in sequence before being connected to the liquid phase delivery pipeline; one end of the liquid phase vacuuming pipeline is connected to the liquid phase vacuuming equipment, and the other end is connected to the liquid phase vacuum automatic control valve in sequence before being connected to the liquid phase delivery pipeline; one end of the liquid phase venting pipeline is connected to the liquid phase venting equipment, and the other end is connected to the sixth check valve and the liquid phase venting automatic control valve in sequence before being connected to the liquid phase delivery pipeline.

[0009] Secondly, this application provides a method for filling medical intelligent sterilization gas, the filling process including the following steps: S1. Control all valves in the filling pipeline to keep them closed through the control system, place the gas cylinder in the work station, and verify the safety of the gas cylinder. S2. After the safety verification is passed, the gas phase delivery pipeline is vented and evacuated. S3. Vent and vacuum the liquid phase transport pipeline; S4. Open the automatic control valve for gas phase nitrogen, so that the gas phase N2 supply system can replace the nitrogen in the gas phase channel with nitrogen, and then perform venting and vacuuming again. S5. Control the liquid phase N2 supply system to fill the liquid phase channel with nitrogen and then vent it, and then evacuate the inside of the gas cylinder. S6. Control the EO filling automatic control valve to open, and at the same time control the return gas automatic control valve to open, close the valves on other pipelines, and start automatically filling the gas cylinder until the target weight is reached. S7. Control the EO filling automatic control valve and return gas automatic control valve to close, and control the liquid phase nitrogen automatic control valve and gas phase nitrogen automatic control valve to open, so as to send the residual liquid and residual gas in the pipeline to the gas cylinder.

[0010] In some specific implementations, the process of verifying the safety of the gas cylinder in step S1 is as follows: After the gas cylinder is placed at the workstation, the gas cylinder number is received by RFID scanning and uploaded. To find the filling parameters of the gas cylinder corresponding to this cylinder number, the filling parameters include the type of gas last filled into the cylinder and the number of times the cylinder has been used. Determine if the gas type of the last filling is the same as the gas type of this filling and if the number of times the gas cylinder has been used has reached the threshold. If they are the same and the filling threshold has not been reached, then pass the safety verification and update the filling parameters of the gas cylinder.

[0011] In some specific embodiments, step S2 includes the following steps: S21. Open the automatic control valve for gas phase venting, vent the gas phase conveying pipeline through the gas phase venting equipment, and close the automatic control valve for gas phase venting after venting to the target venting pressure. S32. Open the automatic control valve for gas phase vacuum, and use the gas phase vacuum pumping equipment to evacuate the gas phase delivery pipeline until the target vacuum and target pressure are reached, then close the automatic control valve for gas phase vacuum.

[0012] In some specific implementations, step S3 is performed as follows: S31. Open the automatic control valve for liquid phase venting, vent the liquid phase conveying pipeline through the liquid phase venting equipment, and close the automatic control valve for liquid phase venting after a 10-second delay after venting to the target venting pressure. S32. Open the automatic control valve for liquid phase vacuum, and use the liquid phase vacuum pumping equipment to evacuate the liquid phase delivery pipeline until the target vacuum and target pressure are reached, then close the automatic control valve for liquid phase vacuum.

[0013] In some specific implementations, step S4 is performed as follows: S41. Control the gas phase nitrogen automatic control valve to open, so that the gas phase N2 supply system replaces nitrogen in the gas phase channel with nitrogen. After the nitrogen replacement filling reaches the target pressure, control the gas phase nitrogen automatic control valve to close. S42. Open the automatic control valve for gas phase venting, vent the gas phase conveying pipeline through the gas phase venting equipment, and close the automatic control valve for gas phase venting after venting to the target venting pressure. S43. Vacuum the gas phase delivery pipeline, open the gas phase vacuum automatic control valve, and use the gas phase vacuum equipment to vacuum the gas phase delivery pipeline until the target vacuum and target pressure are reached, then close the gas phase vacuum automatic control valve.

[0014] The beneficial effects of this invention are as follows: This application uses RFID identification to match gas cylinder information with cloud data to monitor gas cylinder safety. Vacuum pumping equipment and nitrogen supply pipelines are installed in both the liquid phase channel and the gas phase pipeline. Vacuum pumping can speed up gas filling. Nitrogen circulation is used to cool the pump area, which reduces liquid vaporization and reduces damage to the pipeline. The pipeline in this application uses a remote pneumatic valve, which can remotely control the opening and closing of the valve and detect the pressure in the pipeline through the control system. No manual operation is required during the filling process, which improves the fault tolerance rate and reduces potential risks. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the pipeline connection of a medical intelligent sterilization gas filling system provided in an embodiment of the present invention; Figure 2 A flowchart illustrating the medical intelligent sterilization gas filling method provided in this embodiment of the invention.

[0016] Explanation of reference numerals in the attached figures: 1-Gas phase vacuum pumping equipment; 2-Gas phase venting equipment; 3-Gas return equipment; 4-Gas phase N2 supply system; 5-Liquid phase N2 supply system; 6-EO filling equipment; 7-Liquid phase vacuum pumping equipment; 8-Liquid phase venting equipment; 9-Gas phase vacuum automatic control valve; 10-Gas phase venting automatic control valve; 11-First check valve; 12-Gas return automatic control valve; 13-Second check valve; 14-Gas phase nitrogen automatic control valve; 15-Third check valve. 16-Automatic control valve for liquid phase nitrogen, 17-Fourth check valve, 18-Automatic control valve for EO filling, 19-Fifth check valve, 20-Automatic control valve for liquid phase vacuum, 21-Sixth check valve, 22-Automatic control valve for liquid phase venting, 23-Pressure monitoring equipment, 24-Liquid phase filling hose, 25-Gas phase filling hose, 26-Return valve, 27-Liquid supply valve, 28-First cylinder valve, 29-Second cylinder valve, 30-Gas cylinder, 31-Weighing equipment. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0019] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0020] Furthermore, for clarity and brevity, descriptions of well-known structures, functions, and configurations may have been omitted. Those skilled in the art will recognize that various changes and modifications can be made to the examples described herein without departing from the spirit and scope of this disclosure.

[0021] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0022] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0023] Example 1 like Figure 1 As shown, this embodiment provides a medical intelligent sterilization gas filling system, including a control system and a filling pipeline. The filling pipeline includes a gas phase channel and a liquid phase channel. The gas phase channel is used to regulate the pipeline pressure, discharge oxygen from the pipeline, and recover excess filling gas. Both the gas phase channel and the liquid phase channel are equipped with control valves that are remotely controlled by the control system. The gas phase channel is connected in sequence to a gas phase delivery pipeline, a gas phase filling hose 25, a return gas valve 26, and a first bottle valve 28 before connecting to a gas cylinder 30. The gas phase channel is also equipped with a pressure monitoring device 23 that is communicatively connected to the control system for monitoring the pipeline pressure. The liquid phase channel is used to fill the gas cylinder 30 with sterilization gas EO. The liquid phase channel is connected in sequence to a liquid phase filling hose 24, an inlet valve, and a second bottle valve 29 before connecting to the gas cylinder 30.

[0024] Specifically, the gas phase channel includes a gas phase vacuum pipeline, a gas phase venting pipeline, a nitrogen pressurization pipeline, and a mixed gas cylinder filling-return pipeline, all of which are connected to the gas phase delivery pipeline. Each pipeline is equipped with a control valve that is remotely controlled by the control system to control the connection between the pipeline and the gas phase delivery pipeline. The gas phase delivery pipeline is connected in sequence to the gas phase filling hose 25, the return valve 26, and the first cylinder valve 28 before being connected to the gas cylinder 30. A pressure monitoring device 23 is installed on the nitrogen pressurization pipeline.

[0025] The gas phase vacuuming pipeline is connected to a gas phase vacuuming device 1 at one end and to a gas phase vacuum automatic control valve 9 at the other end, which is then connected to the gas phase delivery pipeline. The gas phase venting pipeline is connected to a gas phase venting device 2 at one end and to a first check valve 11 and a gas phase venting automatic control valve 10 at the other end, which is then connected to the gas phase delivery pipeline. The mixed gas cylinder filling-return pipeline is connected to a return gas device 3 at one end and to a second check valve 13 and a return gas automatic control valve 12 at the other end, which is then connected to the gas phase delivery pipeline. An oxygen content analyzer that communicates with the control system is installed on the mixed gas cylinder filling-return pipeline. The nitrogen pressurization pipeline is connected to a gas phase N2 supply system 4 at one end and to a gas phase nitrogen automatic control valve 14 and a third check valve 15 at the other end, which is then connected to the gas phase delivery pipeline. The pressure monitoring device 23 is installed on the pipeline at the output end of the third check valve 15.

[0026] Specifically, the liquid phase channel includes a liquid phase vacuum pipeline, a liquid phase venting pipeline, a nitrogen supply pipeline, and an EO filling pipeline, all of which are connected to the liquid phase delivery pipeline. Each pipeline is equipped with a control valve that is remotely controlled by the control system to control the connection between the pipeline and the liquid phase delivery pipeline. The liquid phase delivery pipeline is connected in sequence to the liquid phase filling hose 24, the liquid inlet valve, and the second cylinder valve 29 before being connected to the gas cylinder 30.

[0027] Among them, one end of the nitrogen supply pipeline is connected to the liquid phase N2 supply system 5, and the other end is connected to the liquid phase nitrogen automatic control valve 16 and the fourth one-way valve 17 in sequence before being connected to the liquid phase delivery pipeline; one end of the EO filling pipeline is connected to the EO filling equipment 6, and the other end is connected to the EO filling automatic control valve 18 and the fifth one-way valve 19 in sequence before being connected to the liquid phase delivery pipeline; one end of the liquid phase vacuuming pipeline is connected to the liquid phase vacuuming equipment 7, and the other end is connected to the liquid phase vacuum automatic control valve 20 in sequence before being connected to the liquid phase delivery pipeline; one end of the liquid phase venting pipeline is connected to the liquid phase venting equipment 8, and the other end is connected to the sixth one-way valve 21 and the liquid phase venting automatic control valve 22 in sequence before being connected to the liquid phase delivery pipeline.

[0028] Based on the aforementioned medical intelligent sterilization gas filling system, its filling process can be summarized as follows: Preliminary preparation (checking initial state, connecting tubing, selecting formula, opening bottle valve) → venting the gas phase channel to the target pressure → evacuating the gas phase channel to the target pressure → venting the liquid phase channel to the target pressure → evacuating the liquid phase channel to the target pressure → nitrogen purging (filling device replaces nitrogen to the target pressure state → venting the purging nitrogen gas phase to the target pressure → evacuating the purging nitrogen gas phase pipeline to the target pressure) → filling (EO liquid inlet and gas return simultaneously → EO liquid inlet reaches the target weight → liquid phase pipeline nitrogen purging reaches a 5-second delay → gas phase pipeline nitrogen pressurization to the target pressure) → filling completion (closing bottle valve → confirming venting to the target pressure → disconnecting tubing → end). Each specific step is as follows: (1) Preliminary preparations: S1. By controlling the control system to keep all valves in the filling pipeline closed, the gas cylinder 30 is placed in the work station, and the safety verification of the gas cylinder 30 is carried out. The safety verification process is as follows: S11. After the gas cylinder 30 is placed at the workstation, it is scanned using RFID technology, and the gas cylinder 30 number obtained by RFID scanning is uploaded to the control system. S12. Query the filling parameters of the gas cylinder 30 corresponding to the number of the gas cylinder 30. The filling parameters include the type of gas last filled in the gas cylinder 30 and the number of times the gas cylinder 30 has been used. The control system confirms the gas last filled in the gas cylinder 30 and checks the service life of the gas cylinder 30 through cloud data. Once the filling parameters are confirmed to be valid, the filling process is started to ensure the stability of the filling process. S13. Determine whether the gas type filled last time is the same as the gas type filled this time and whether the number of times the gas cylinder 30 has been used has reached the threshold. If they are the same and the filling threshold has not been reached, then pass the safety verification and update the filling parameters of the gas cylinder 30.

[0029] S2. After the safety verification is passed, connect the hose and begin testing the system status. S21. As prompted, confirm that the return valve, supply valve 27, first bottle valve 28 and second bottle valve 29 are closed, and connect the gas phase filling hose 25 and the liquid phase filling hose 24.

[0030] S22. Then open the return valve, supply valve 27, first bottle valve 28 and second bottle valve 29. The control program obtains the oxygen content uploaded by the oxygen content analyzer and the pressure status in the system to determine whether there is oxygen in the gas phase channel and liquid phase channel. If oxygen is present, deoxygenation treatment needs to be performed in the system to ensure an oxygen-free environment in the system.

[0031] (2) Venting and vacuuming of the gas phase channel S3. Vent and evacuate the gas phase delivery pipeline and receive the pressure status inside the delivery pipeline in real time. S31. Vent the gas phase conveying pipeline, control the gas phase venting automatic control valve 10 to open, vent the gas phase conveying pipeline through the gas phase venting device 2, and close the gas phase venting automatic control valve 10 after venting to the venting target pressure. S32. Vacuum the gas phase delivery pipeline, open the gas phase vacuum automatic control valve 9, and vacuum the gas phase delivery pipeline through the gas phase vacuum pumping equipment 1 until the target vacuum and target pressure are reached, then close the gas phase vacuum automatic control valve 9. (3) Venting and vacuuming of the liquid phase channel S4. Vent and evacuate the liquid phase delivery pipeline and receive the pressure status inside the pipeline in real time. S41. Vent the liquid phase conveying pipeline, control the liquid phase venting automatic control valve 22 to open, vent the liquid phase conveying pipeline through the liquid phase venting device 8, and vent to the venting target pressure and then delay for 10 seconds to close the liquid phase venting automatic control valve 22. S42. Vacuum the liquid phase conveying pipeline, open the liquid phase vacuum automatic control valve 20, and vacuum the liquid phase conveying pipeline through the liquid phase vacuum pumping equipment 7 until the target vacuum and target pressure are reached, then close the liquid phase vacuum automatic control valve 20. (4) Replace the liquid phase channel and the gas phase channel with nitrogen to ensure an oxygen-free environment in the system; S5. Fill the gas phase transmission pipeline with nitrogen to perform nitrogen purging. S51. Control the gas phase nitrogen automatic control valve 14 to open, so that the gas phase N2 supply system 4 replaces nitrogen in the gas phase channel with nitrogen. After the replacement nitrogen filling reaches the target pressure, control the gas phase nitrogen automatic control valve 14 to close. S52. The gas phase venting automatic control valve 10 is opened, and the gas phase conveying pipeline is vented through the gas phase venting device 2. After venting to the venting target pressure, the gas phase venting automatic control valve 10 is closed. S53. Vacuum the gas phase delivery pipeline, open the gas phase vacuum automatic control valve 9, and vacuum the gas phase delivery pipeline through the gas phase vacuum pumping equipment 1 until the target vacuum and target pressure are reached, then close the gas phase vacuum automatic control valve 9. S6. Fill the liquid phase delivery pipeline with nitrogen and simultaneously evacuate the inside of the gas cylinder. S61. Control the liquid phase nitrogen automatic control valve 16 to open, so that the liquid phase N2 supply system 5 can replace nitrogen in the liquid phase channel with nitrogen. After the replacement nitrogen filling reaches the target pressure, control the gas phase nitrogen automatic control valve 14 to close. S62, open the automatic control valve 22 for liquid phase venting, and vent the gas inside the liquid phase conveying pipeline and gas cylinder 30 through the liquid phase venting device 8. Vent until the target venting pressure is reached and close the automatic control valve 22 for liquid phase venting. S63. Vacuum the liquid phase conveying pipeline, open the liquid phase vacuum automatic control valve 20, and vacuum the liquid phase conveying pipeline through the liquid phase vacuum pumping equipment 7 until the target vacuum target pressure (below -0.5Mpa) is reached, then close the liquid phase vacuum automatic control valve 20. (5) Fill the system with medical sterilization gas EO. S7. Open the control valve on the liquid phase pipeline EO filling pipeline and simultaneously open the liquid phase nitrogen supply pipeline and the gas phase return pipeline to purge and return the EO filling pipeline with nitrogen. Close the valves on other pipelines and start automatic filling until the target weight is reached. S71. Control the EO filling automatic control valve 18 to open, so that the EO filling equipment 6 inputs EO into the liquid phase delivery pipeline; S72. While EO is being injected, the gas phase pipeline is being returned to gas. The automatic return control valve 12 on the mixed gas cylinder filling-return pipeline is opened to allow the return equipment 3 to process the return gas in the pipeline. S73. Real-time detection of whether the EO filling in the gas cylinder has reached the target weight. After reaching the target weight, control the EO filling automatic control valve 18 to close and stop filling (during the filling process, the gas phase flows back into the gas cylinder, and the starting weight is when the gas cylinder is completely evacuated). S8. Use nitrogen to treat the residual liquid and gas in the system, and pressurize the residual liquid and gas in the gas phase channel and liquid phase channel to the gas cylinder. Since EO has low pressure and low density, there is still residual EO in the liquid phase delivery pipeline of the system after filling to the target weight. Therefore, it is necessary to use nitrogen to purge the liquid phase delivery pipeline and pressurize it by filling the gas phase pipeline with nitrogen to push the vaporized EO gas into the pipeline. S81. After reaching the target weight, control the EO filling automatic control valve 18 and the return gas automatic control valve 12 to close, and then control the liquid phase nitrogen automatic control valve 16 to open, so that the liquid phase N2 supply system 5 purges nitrogen into the liquid phase channel, and sweeps the internal residual liquid back into the gas cylinder. After purging nitrogen for 5 seconds, delay for 5 seconds, and then control the liquid phase nitrogen automatic control valve 16 to close. S82. The gas phase nitrogen automatic control valve 14 is opened, so that the gas phase N2 supply system 4 fills the gas phase channel with nitrogen to pressurize it, and sends the residual gas pressure inside the pipeline to the gas cylinder 30. After the nitrogen in the gas phase pipeline is pressurized to the target pressure, the gas phase nitrogen automatic control valve 14 is closed.

[0032] S83, Close the return gas valve 26, the liquid supply valve 27, the first bottle valve 28, and the second bottle valve 29; (6) Remove the system after filling is completed. S9. Confirm that all valves in the system are closed, confirm that all residual gas and liquid in the system have been released and the target release pressure has been reached, remove the hose, and the filling is complete.

[0033] During the filling process, the filling material vaporizes due to prolonged pump operation; therefore, nitrogen is used to cool the pump. Furthermore, because EO gas has low pressure and low density, pressure detection is inconvenient. Therefore, this application includes nitrogen lines in both the gas phase channel and the liquid phase channel. The nitrogen pressurization line in the gas phase channel is used to increase the pressure inside the pipeline during EO gas filling, allowing the EO gas to be completely forced into the gas cylinder 30. The nitrogen supply line in the liquid phase channel can backflush the residual gas in the liquid phase delivery pipeline, using high-pressure nitrogen to push the residual EO liquid gas in the pipeline into the gas cylinder 30. The gas cylinder 30 is placed on the weighing device 31, and filling is stopped if the target weight is reached.

[0034] Understandably, since EO liquid cannot directly contact oxygen during filling, it is necessary to ensure an oxygen-free environment within the system and use nitrogen for protection. If oxygen is detected in the filling system, nitrogen is automatically purged into the system via pumps in the pipeline, pressurized to 0.5 MPa, allowed to stand for 3 hours, and then vented to atmospheric pressure via a program-controlled valve. This allows the oxygen and nitrogen in the pipeline to completely replace each other. After the oxygen and nitrogen in the system pipeline are completely replaced, the gas inside the cylinder is vented, and the initial pressure inside the cylinder is detected. If the initial pressure is higher than -0.5 MPa, the cylinder is evacuated to reduce the internal pressure to -0.5 MPa. After this process, the cylinder can be automatically filled, and the return gas line is opened until the target weight is reached. To avoid residual EO liquid when disassembling the system pipeline later, nitrogen is refilled to send the remaining liquid and gas pressure inside the pipeline back into the cylinder.

Claims

1. A medical intelligent sterilization gas filling system, characterized in that, The system includes a control system and a filling pipeline. The filling pipeline includes a gas phase channel and a liquid phase channel. The gas phase channel is used to regulate the pipeline pressure, discharge oxygen from the pipeline, and recover excess filling gas. Both the gas phase channel and the liquid phase channel are equipped with control valves that are remotely controlled by the control system. The gas phase channel is connected in sequence to the gas phase delivery pipeline, the gas phase filling hose (25), the return valve (26), and the first bottle valve (28) before connecting to the gas cylinder (30). The gas phase channel is also equipped with a pressure monitoring device (23) that is connected to the control system to monitor the pressure of the pipeline. The liquid phase channel is used to fill the gas cylinder (30) with sterilizing gas EO. The liquid phase channel is connected in sequence to the liquid phase filling hose (24), the inlet valve, and the second bottle valve (29) before connecting to the gas cylinder (30). The gas phase channel includes a gas phase vacuum pipeline, a gas phase venting pipeline, a nitrogen pressurization pipeline, and a mixed gas cylinder filling-return pipeline, all of which are connected to the gas phase delivery pipeline. Each pipeline is equipped with a control valve that is remotely controlled by the control system to control the connection between the pipeline and the gas phase delivery pipeline. The gas phase delivery pipeline is connected in sequence to the gas phase filling hose (25), the return valve (26), and the first cylinder valve (28) before being connected to the gas cylinder (30). The pressure monitoring device (23) is installed on the nitrogen pressurization pipeline. The liquid phase channel includes a liquid phase vacuum pipeline, a liquid phase venting pipeline, a nitrogen supply pipeline, and an EO filling pipeline, all of which are connected to the liquid phase delivery pipeline. Each pipeline is equipped with a control valve that is remotely controlled by the control system to control the connection between the pipeline and the liquid phase delivery pipeline. The liquid phase delivery pipeline is connected in sequence to the liquid phase filling hose (24), the liquid inlet valve, and the second cylinder valve (29) before being connected to the gas cylinder (30).

2. The medical intelligent sterilization gas filling system according to claim 1, characterized in that, One end of the gas phase vacuum pipeline is connected to the gas phase vacuum equipment (1), and the other end is connected to the gas phase vacuum automatic control valve (9) and then connected to the gas phase delivery pipeline. One end of the gas phase venting pipeline is connected to the gas phase venting equipment (2), and the other end is connected to the first check valve (11) and the gas phase venting automatic control valve (10) in sequence and then connected to the gas phase delivery pipeline. One end of the mixed gas cylinder filling-return pipeline is connected to the return gas equipment (3), and the other end is connected to the second check valve (13) and the return gas automatic control valve (12) in sequence and then connected to the gas phase delivery pipeline. An oxygen content analyzer that communicates with the control system is installed on the mixed gas cylinder filling-return pipeline. One end of the nitrogen pressurization pipeline is connected to the gas phase N2 supply system (4), and the other end is connected to the gas phase nitrogen automatic control valve (14) and the third check valve (15) in sequence and then connected to the gas phase delivery pipeline. The pressure monitoring equipment (23) is set on the pipeline at the output end of the third check valve (15).

3. The medical intelligent sterilization gas filling system according to claim 2, characterized in that, One end of the nitrogen supply pipeline is connected to the liquid phase N2 supply system (5), and the other end is connected to the liquid phase nitrogen automatic control valve (16) and the fourth check valve (17) in sequence, and then connected to the liquid phase delivery pipeline; one end of the EO filling pipeline is connected to the EO filling equipment (6), and the other end is connected to the EO filling automatic control valve (18) and the fifth check valve (19) in sequence, and then connected to the liquid phase delivery pipeline; one end of the liquid phase vacuum pipeline is connected to the liquid phase vacuum equipment (7), and the other end is connected to the liquid phase vacuum automatic control valve (20) in sequence, and then connected to the liquid phase delivery pipeline; one end of the liquid phase venting pipeline is connected to the liquid phase venting equipment (8), and the other end is connected to the sixth check valve (21) and the liquid phase venting automatic control valve (22) in sequence, and then connected to the liquid phase delivery pipeline.

4. A method for filling medical intelligent sterilization gas, characterized in that, The filling process, applied to the medical intelligent sterilization gas filling system as described in claim 3, includes the following steps: S1. Control all valves in the filling pipeline to keep them closed by the control system, put the gas cylinder (30) into the work station, and verify the safety of the gas cylinder (30); S2. After the safety verification is passed, the gas phase delivery pipeline is vented and evacuated. S3. Vent and vacuum the liquid phase transport pipeline; S4. Control the gas phase nitrogen automatic control valve (14) to open, so that the gas phase N2 supply system (4) fills the gas phase channel with nitrogen, and then performs venting and vacuuming again; S5. Control the liquid phase N2 supply system (5) to fill the liquid phase channel with nitrogen and then vent it, and then evacuate the inside of the gas cylinder. S6. Control the EO filling automatic control valve (18) to open, and at the same time control the return gas automatic control valve (12) to open, close the valves on other pipelines, and start automatically filling the gas cylinder until the target weight is reached. S7. Control the EO filling automatic control valve (18) and return gas automatic control valve (12) to close, and control the liquid phase nitrogen automatic control valve (16) and gas phase nitrogen automatic control valve (14) to open, so as to send the remaining liquid and gas in the pipeline to the gas cylinder (30).

5. A medical intelligent sterilization gas filling method according to claim 4, characterized in that, The process of verifying the safety of gas cylinder (30) in step S1 is as follows: After the gas cylinder (30) is placed at the workstation, the gas cylinder (30) number is received by RFID scanning and uploaded; Query the filling parameters of the gas cylinder (30) corresponding to the number of the gas cylinder (30). The filling parameters include the type of gas last filled into the gas cylinder (30) and the number of times the gas cylinder (30) has been used. Determine whether the gas type of the last filling is the same as the gas type of this filling and whether the number of times the gas cylinder (30) has been used has reached the threshold. If they are the same and the filling threshold has not been reached, then pass the safety verification and update the filling parameters of the gas cylinder (30).

6. The medical intelligent sterilization gas filling method according to claim 4, characterized in that, The specific steps of step S2 include: S21. Open the automatic control valve (10) for gas phase venting and vent the gas phase conveying pipeline through the gas phase venting device (2). After venting to the target venting pressure, close the automatic control valve (10) for gas phase venting. S32. Open the gas phase vacuum automatic control valve (9) and use the gas phase vacuum pumping equipment (1) to perform vacuuming on the gas phase delivery pipeline until the target vacuum and target pressure are reached, then close the gas phase vacuum automatic control valve (9).

7. A medical intelligent sterilization gas filling method according to claim 4, characterized in that, The specific process of step S3 is as follows: S31. The liquid phase venting automatic control valve (22) is opened, and the liquid phase conveying pipeline is vented through the liquid phase venting device (8). After venting to the venting target pressure, the liquid phase venting automatic control valve (22) is closed after a delay of 10 seconds. S32. Open the automatic control valve (20) for liquid phase vacuum, and use the liquid phase vacuum pumping equipment (7) to perform vacuuming on the liquid phase conveying pipeline until the target vacuum and target pressure are reached, then close the automatic control valve (20).

8. A medical intelligent sterilization gas filling method according to claim 4, characterized in that, The specific process of step S4 is as follows: S41. Control the gas phase nitrogen automatic control valve (14) to open, so that the gas phase N2 supply system (4) replaces nitrogen in the gas phase channel with nitrogen. After the replacement nitrogen filling reaches the target pressure, control the gas phase nitrogen automatic control valve (14) to close. S42. Open the automatic control valve (10) for gas phase venting and vent the gas phase conveying pipeline through the gas phase venting device (2). After venting to the target venting pressure, close the automatic control valve (10) for gas phase venting. S43. Vacuum the gas phase delivery pipeline, open the gas phase vacuum automatic control valve (9), and vacuum the gas phase delivery pipeline through the gas phase vacuum pumping equipment (1) until the target vacuum and target pressure are reached, then close the gas phase vacuum automatic control valve (9).

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