System and method for automatically and rapidly preparing submersible mixed gas

Abstract

The invention discloses an automatic rapid preparation system and method for diving mixed gas, and relates to the diving field, the system comprises a gas source supply module, a gas conveying module, a preparation mixing module, a monitoring regulation and control module, a filling output module and a central control module, the gas source supply module is used for providing pure oxygen and inert gas; the gas conveying module is used for conveying gas provided by the gas source module to the preparation unit according to set flow and pressure, and the preparation mixing module is used for receiving oxygen and inert gas from the gas conveying module and carrying out physical stirring and uniform mixing. Automatic gas injection, stirring and feedback adjustment are controlled through the gas weight, preparation of 20 gas cylinders can be completed within 3-4 hours, compared with traditional manual preparation which needs standing for 24 hours or above, the preparation period is greatly shortened, and the method is suitable for large-scale diving emergency tasks and quick response requirements.

Description

Technical Field

[0001] This invention relates to diving technology, and more specifically to an automatic and rapid preparation system and method for diving mixed gases. Background Technology

[0002] Diving gas mixture is an essential breathing gas for deep-sea, large-scale, long-term underwater construction and salvage operations. It has been widely used in military and civilian fields such as seabed construction operations, underwater resource exploration, and marine scientific research.

[0003] Currently, the preparation of diving gas mixtures is usually done by manually filling nitrogen and helium into oxygen cylinders. This method is not only inefficient, but also requires 24-48 hours of settling after preparation to ensure that the nitrogen, helium and oxygen are fully mixed. Furthermore, it needs to be prepared before the diving mission, which is not conducive to dealing with emergencies.

[0004] To address the problems raised in the background art, those skilled in the art have proposed an automatic and rapid preparation system and method for underwater mixed gases. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic and rapid preparation system and method for diving mixed gases, in order to solve the problems that the existing preparation methods are not only inefficient, but also require 24-48 hours of settling after preparation to ensure that nitrogen, helium and oxygen are fully mixed, and need to be prepared before the diving mission, which is not conducive to dealing with emergencies.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an automatic and rapid preparation system for diving mixed gases, comprising a gas supply module, a gas delivery module, a preparation and mixing module, a monitoring and control module, a filling and output module, and a central control module. The gas supply module provides pure oxygen and inert gas. The gas delivery module delivers the gas provided by the gas supply module to the preparation unit at a set flow rate and pressure. The preparation and mixing module receives oxygen and inert gas from the gas delivery module and performs physical stirring and uniform mixing. The monitoring and control module collects the oxygen concentration, pressure, and temperature parameters of the gas in the preparation tank in real time and performs dynamic feedback adjustment according to the set target. The filling and output module pressurizes and fills the uniformly mixed gas into the target gas cylinder and implements temperature control during the filling process. The central control module performs gas volume calculation, process control, parameter monitoring, and feedback adjustment, coordinating the above modules to achieve fully automatic, rapid, and safe preparation of mixed gases.

[0007] Furthermore, the gas supply module includes: an oxygen source, a helium / nitrogen source, a first electronic scale, and a second electronic scale. The first electronic scale is located at the bottom of the oxygen source, which provides pure oxygen and is used to weigh the oxygen source in real time. The second electronic scale is located at the bottom of the helium / nitrogen source, which provides inert gas and is used to weigh the helium / nitrogen source in real time. Both the first and second electronic scales are communicatively connected to the central control module to achieve real-time acquisition and feedback of mass data.

[0008] Furthermore, the gas delivery module includes: a first pipeline pressure and temperature controller, a second pipeline pressure and temperature controller, a first solenoid valve, a second solenoid valve, and a gas pipeline. The first and second pipeline pressure and temperature controllers are respectively installed on the oxygen and inert gas delivery pipelines to regulate the gas pressure and temperature in the pipelines. The first and second solenoid valves are respectively located on the oxygen and inert gas pipelines and are controlled by the central control module to switch the gas delivery on and off. The gas pipeline connects to the gas supply module, the mixing module, and the filling and output module, forming a gas flow channel.

[0009] Furthermore, the preparation and mixing module includes a preparation component, which includes a preparation tank, a stirring motor, and stirring blades. The preparation tank is a closed pressure vessel used to contain and mix gases. The stirring motor is installed at the bottom of the preparation tank, and the stirring blades are located inside the preparation tank and connected to the output shaft of the stirring motor to force the gas to be stirred to accelerate mixing.

[0010] Furthermore, the monitoring and control module includes a monitoring component and a second pressure gauge. The monitoring component includes a first oxygen analyzer, a second oxygen analyzer, a third oxygen analyzer, an electronic thermometer, and a first pressure gauge. The first, second, and third oxygen analyzers and the electronic thermometer are all located inside the preparation tank. The first, second, and third oxygen analyzers are respectively installed at the top, middle, and bottom of the preparation tank to monitor the oxygen concentration at different heights inside the tank. The electronic thermometer is located at the top inside the preparation tank. The first pressure gauge is installed on the preparation tank to monitor the pressure and temperature inside the tank. The second pressure gauge is installed on the filling pipeline to monitor the filling pressure. All sensors are communicatively connected to the central control module.

[0011] Furthermore, the filling output module includes a first membrane press, a second membrane press, a third solenoid valve, a preparation gas cylinder, and a refrigeration component. The first and second membrane presses are used to provide filling power, pressurizing and delivering the mixed gas in the preparation tank to the preparation gas cylinder. The third solenoid valve is installed on the filling pipeline to control the start and stop of filling. The preparation gas cylinder is the target output container. The refrigeration component is used to cool the gas cylinder during the filling process.

[0012] Furthermore, the refrigeration assembly includes a refrigeration unit, a spiral refrigeration pipe, a placement plate, and a side protection plate. The refrigeration unit is used to provide a cold source, the side protection plate is used for structural fixation and safety protection, the side protection plate has a placement plate on its side, the placement plate is used to support the gas cylinder, and the upper surface of the placement plate has a spiral refrigeration pipe, which is wound around the surface of the gas cylinder for conduction cooling.

[0013] Furthermore, the central control module is a console, which is connected via circuit lines to a first electronic scale, a second electronic scale, a first pipeline pressure and temperature controller, a second pipeline pressure and temperature controller, a first solenoid valve, a second solenoid valve, a third solenoid valve, a first oxygen analyzer, a second oxygen analyzer, a third oxygen analyzer, an electronic thermometer, a first pressure gauge, a second pressure gauge, a first diaphragm press, a second diaphragm press, a stirring motor, and a refrigeration unit. The console has built-in control logic that can automatically calculate the required oxygen and inert gas mass based on the input target gas parameters, and sequentially control the entire process of evacuation, gas injection, stirring, feedback, correction and replenishment, and filling.

[0014] An automated and rapid preparation method for diving gas mixtures includes the following steps:

[0015] S1. Calculate the required mass of oxygen and inert gas based on the oxygen concentration, cylinder volume, pressure, and quantity of the target mixed gas, and add a pre-defined proportion of preparation redundancy.

[0016] S2. Start the first and second membrane presses to evacuate the preparation tank and remove residual gas from the tank;

[0017] S3. Control the opening of the first and second solenoid valves, and inject oxygen and inert gas into the preparation tank according to the calculated mass, while starting the stirring motor to stir.

[0018] S4. The oxygen concentration at different locations inside the tank is monitored by the first oxygen meter, the second oxygen meter and the third oxygen meter. If the concentration does not meet the standard, the amount of gas to be added is calculated based on the tank volume, pressure and temperature. A small amount of gas is added through the first pipeline pressure and temperature controller and the second pipeline pressure and temperature controller, the first solenoid valve and the second solenoid valve until the concentration at each measuring point is consistent and stable.

[0019] S5. Start the refrigeration unit, and then control the second diaphragm press and the third solenoid valve to fill the well-mixed gas into the preparation gas cylinder.

[0020] Furthermore, the gas replenishment process in S4 employs closed-loop feedback control:

[0021] The control console compares the oxygen analyzer data with the target concentration in real time. If the concentration is lower than the target value, it controls the supplementation of oxygen; if the concentration is higher than the target value, it controls the supplementation of inert gas. The supplementation flow rate is regulated by the pipeline pressure and temperature controller and the solenoid valve in coordination until the concentration reaches the set range and remains stable for more than the set time.

[0022] Compared with the prior art, the automatic rapid preparation system and method for underwater mixed gas provided by the present invention has the following beneficial effects:

[0023] 1. Through automated gas injection, stirring and feedback adjustment, 20 gas cylinders can be prepared in 3 to 4 hours. Compared with the traditional manual preparation which requires more than 24 hours of standing, the preparation cycle is greatly shortened, making it suitable for emergency tasks and rapid response needs.

[0024] 2. The entire process is automatically executed by the central control module, requiring only one person to operate and monitor, while the traditional method requires at least three people to work together intensively, significantly reducing reliance on manpower and operational intensity;

[0025] 3. The preparation tank is equipped with three oxygen concentration monitoring points at the top, middle and bottom. Combined with real-time stirring and closed-loop feedback gas replenishment mechanism, it ensures uniform gas mixing, stable oxygen concentration at the target value, small error and good repeatability.

[0026] 4. The system adopts a fully enclosed pipeline and automatic control, which reduces the risk of direct manual operation of high-pressure gas. The cooling components are activated during the filling process to prevent the gas cylinder from overheating, thereby improving filling safety and the service life of the gas cylinder. Once the configuration is completed and the temperature is suitable, it can be used immediately, improving timeliness. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0028] Figure 1 A schematic diagram of the overall system structure is provided for embodiments of the present invention;

[0029] Figure 2 This is a schematic diagram of the preparation components in this invention;

[0030] Figure 3 This is a schematic diagram of the structure of the refrigeration component in this invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. First electronic scale; 2. Oxygen source; 3. Second electronic scale; 4. Helium / nitrogen source; 5. First pipeline pressure and temperature controller; 6. Second pipeline pressure and temperature controller; 7. First solenoid valve; 8. Second solenoid valve; 9. Preparation assembly; 901. Preparation tank; 902. First oxygen analyzer; 903. Second oxygen analyzer; 904. Third oxygen analyzer; 905. Stirring motor; 906. Stirring blades; 907. Electronic thermometer; 908. First pressure surface; 10. First diaphragm press; 11. Second diaphragm press; 12. Third solenoid valve; 13. Preparation gas cylinder; 14. Second pressure gauge; 15. Control console; 16. Gas pipeline; 17. Electrical wiring; 18. Refrigeration assembly; 1801. Refrigeration unit; 1802. Side protective plate; 1803. Placement plate; 1804. Spiral refrigeration pipe. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] As attached Figure 1 To be continued Figure 3 As shown:

[0035] Example 1:

[0036] This invention provides an automatic and rapid mixing system for diving mixed gases, including a gas supply module, a gas delivery module, a mixing module, a monitoring and control module, a filling and output module, and a central control module. The gas supply module provides pure oxygen and inert gas. The gas delivery module delivers the gas provided by the gas supply module to the mixing unit at a set flow rate and pressure. The mixing module receives the oxygen and inert gas from the gas delivery module and performs physical stirring and uniform mixing. The monitoring and control module collects the oxygen concentration, pressure, and temperature parameters of the gas in the mixing tank 901 in real time and performs dynamic feedback adjustment according to the set target. The filling and output module pressurizes and fills the uniformly mixed gas into the target gas cylinder and implements temperature control during the filling process. The central control module performs gas volume calculation, process control, parameter monitoring, and feedback adjustment, coordinating the above modules to achieve fully automatic, rapid, and safe mixing of mixed gases.

[0037] In one embodiment of the present invention, the gas supply module includes: an oxygen source 2, a helium / nitrogen source 4, a first electronic scale 1, and a second electronic scale 3. The first electronic scale 1 is located at the bottom of the oxygen source 2, which provides pure oxygen, and the first electronic scale 1 is used to weigh the oxygen source 2 in real time. The second electronic scale 3 is located at the bottom of the helium / nitrogen source 4, which provides inert gas, and the second electronic scale 3 is used to weigh the helium / nitrogen source 4 in real time. Both the first electronic scale 1 and the second electronic scale 3 are communicatively connected to the central control module to realize real-time acquisition and feedback of mass data. Both electronic scales communicate with the control console 15 through the circuit line 17 to transmit mass data to the central control module in real time, which serves as the basis for judging whether the gas injection process has reached the calculated mass.

[0038] In one embodiment of the present invention, the gas delivery module includes: a first pipeline pressure and temperature controller 5, a second pipeline pressure and temperature controller 6, a first solenoid valve 7, a second solenoid valve 8, and a gas pipeline 16. The first pipeline pressure and temperature controller 5 and the second pipeline pressure and temperature controller 6 are respectively installed on the oxygen and inert gas delivery pipelines to regulate the gas pressure and temperature in the pipelines. The first solenoid valve 7 and the second solenoid valve 8 are respectively installed on the oxygen and inert gas pipelines 16 and are controlled by the central control module to switch the gas delivery on and off. The gas pipeline 16 connects the gas source supply module, the mixing module, and the filling and output module to form a gas flow channel. The first pipeline pressure and temperature controller 5 and the first solenoid valve 7 are connected in series in the oxygen delivery pipeline to precisely regulate the oxygen delivery pressure and temperature and control the on / off state. The second pipeline pressure and temperature controller 6 and the second solenoid valve 8 are connected in series in the helium / nitrogen source 4 delivery pipeline and have the same function. The gas pipeline 16 connects each module to form a complete gas passage.

[0039] In one embodiment of the present invention, the preparation and mixing module includes a preparation component 9, which includes a preparation tank 901, a stirring motor 905, and a stirring blade 906. The preparation tank 901 is a sealed pressure vessel used to contain and mix gases. The stirring motor 905 is installed at the bottom of the preparation tank 901. The stirring blade 906 is located inside the preparation tank 901 and connected to the output shaft of the stirring motor 905, used to force the gas to be stirred to accelerate mixing. The preparation tank 901 is a pressure-resistant sealed container, and the stirring motor 905 is installed at its bottom to drive the stirring blade 906 inside the tank to rotate, thereby forcibly stirring the injected oxygen and helium / nitrogen, breaking the stratification that may occur due to the density difference of the gas, and significantly shortening the mixing time.

[0040] In one embodiment of the present invention, the monitoring and control module includes a monitoring component and a second pressure gauge 14. The monitoring component includes a first oxygen analyzer 902, a second oxygen analyzer 903, a third oxygen analyzer 904, an electronic thermometer 907, and a first pressure gauge. The first oxygen analyzer 902, the second oxygen analyzer 903, the third oxygen analyzer 904, and the electronic thermometer 907 are all located inside the preparation tank 901. The first oxygen analyzer 902, the second oxygen analyzer 903, and the third oxygen analyzer 904 are respectively installed at the upper, middle, and lower positions of the preparation tank 901 to monitor the oxygen concentration at different heights inside the tank. The electronic thermometer 907 is located at the top inside the preparation tank 901. The first pressure gauge is installed on the preparation tank 901 to monitor the pressure and temperature inside the tank. The second pressure gauge 14 is installed on the filling pipeline to monitor the filling pressure. All sensors are communicatively connected to the central control module.

[0041] In one embodiment of the present invention, the filling output module includes a first membrane press 10, a second membrane press 11, a third solenoid valve 12, a preparation gas cylinder 13, and a cooling component 18. The first membrane press 10 and the second membrane press 11 are used to provide filling power, pressurize the mixed gas in the preparation tank 901 and deliver it to the preparation gas cylinder 13. The third solenoid valve 12 is set on the filling pipeline and is used to control the start and stop of filling. The preparation gas cylinder 13 is the target output container. The cooling component 18 is used to cool the gas cylinder during the filling process.

[0042] In one embodiment of the present invention, the refrigeration assembly 18 includes a refrigeration unit 1801, a spiral refrigeration pipe 1804, a placement plate 1803, and a side protection plate 1802. The refrigeration unit 1801 is used to provide a cold source, the side protection plate 1802 is used for structural fixation and safety protection, and the placement plate 1803 is provided on the side of the side protection plate 1802. The placement plate 1803 is used to support the preparation gas cylinder 13, and the spiral refrigeration pipe 1804 is provided on the upper surface of the placement plate 1803. The spiral refrigeration pipe 1804 is wound around the surface of the preparation gas cylinder 13 for conducting cooling.

[0043] In one embodiment of the present invention, the central control module is a console 15. The console 15 is connected to a first electronic scale 1, a second electronic scale 3, a first pipeline pressure and temperature controller 5, a second pipeline pressure and temperature controller 6, a first solenoid valve 7, a second solenoid valve 8, a third solenoid valve 12, a first oxygen analyzer 902, a second oxygen analyzer 903, a third oxygen analyzer 904, an electronic thermometer 907, a first pressure gauge, a second pressure gauge 14, a first membrane press 10, a second membrane press 11, a stirring motor 905, and a refrigerator 1801 via a circuit line 17. The console 15 has built-in control logic, which can automatically calculate the required oxygen and inert gas mass according to the input target gas parameters, and sequentially control the entire process of evacuation, gas injection, stirring, feedback, correction and replenishment, and filling.

[0044] Working principle:

[0045] The operator inputs the target parameters into the human-machine interface of console 15. The built-in algorithm of console 1515 automatically calculates based on the ideal gas law. Then, oxygen source 2, helium / nitrogen source 4, and preparation gas cylinder 13 are prepared. After confirming that the gas sources are in place, the operator starts the automatic preparation program. Console 15 first performs a system self-check, and then issues a command to start the first membrane press 10 and the second membrane press 11 to perform a vacuum operation on the preparation tank 901 and related pipelines to remove residual gas or impurities from the previous preparation, ensuring the purity of the current preparation. After the vacuum is completed, the membrane press stops. At the same time, the control console 15 sequentially opens the first solenoid valve 7 and the second solenoid valve 8. Oxygen and helium / nitrogen begin to be injected into the preparation tank 901 under the regulation of their respective pipeline pressure and temperature controllers. At the same time, the stirring motor 905 immediately starts, driving the stirring blades 906 to rotate at high speed. The control console 15 reads the data of the first electronic scale 11 and the second electronic scale 3 in real time. When the oxygen consumption and helium consumption are close to the calculated values, the solenoid valves are gradually closed for fine adjustment until the target injection quality is achieved, and then the valves are completely closed. The entire gas injection process is carried out under stirring to achieve preliminary mixing.

[0046] After the gas injection stops, stirring continues. The control console 15 continuously reads the values ​​from the first oxygen meter 902, the second oxygen meter 903, and the third oxygen meter 904. The sign of uniform mixing is that the oxygen concentration readings at the three different locations are consistent and stable. If the readings are inconsistent, stirring continues until they are consistent. Subsequently, the system compares the stable average oxygen concentration with the target value. If it is lower than the target value, the control console 15 activates the first pipeline pressure and temperature controller 5 and the first solenoid valve 7 to replenish a small amount of oxygen. If it is higher than the target value, the second pipeline pressure and temperature controller 6 and the second solenoid valve 8 activate to replenish a small amount of helium / nitrogen. The replenishment process uses small-flow PID regulation, while stirring continues. This closed-loop feedback continues until the oxygen concentration in the tank stabilizes within the range of ±0.1% of the target value and remains stable for more than 10 minutes. At this point, the gas in the tank is considered to be fully mixed and uniform and meets the standard.

[0047] After the mixed gas meets the standard, the filling stage begins. The control console 15 first starts the refrigeration unit 1801 of the refrigeration component 18. The refrigerant circulates in the spiral refrigeration pipe 1804 to pre-cool the empty preparation gas cylinder 13 placed on the placement plate 1803. Then, the control console 15 opens the second diaphragm press 11 and the third solenoid valve 12 to pressurize and fill the mixed gas in the preparation tank 901 into the gas cylinder. During the filling process, the second pressure gauge 14 monitors the pressure, and the refrigeration component 18 continues to work to prevent the gas cylinder from overheating, ensuring that the gas is filled to the target pressure at a safe temperature. After filling one cylinder, the third solenoid valve 12 is closed, and the next gas cylinder is replaced and the operation is repeated until all preparation gas cylinders 13 are filled.

[0048] Example 2:

[0049] This embodiment provides an automatic and rapid preparation method for diving gas mixtures, including the following steps:

[0050] S1. Calculate the required mass of oxygen and inert gas based on the oxygen concentration, cylinder volume, pressure, and quantity of the target mixed gas, and add a pre-defined proportion of preparation redundancy.

[0051] S2. Start the first membrane press 10 and the second membrane press 11 to evacuate the preparation tank 901 and remove the residual gas in the tank;

[0052] S3. Control the opening of the first solenoid valve 7 and the second solenoid valve 8, and inject oxygen and inert gas into the preparation tank 901 according to the calculated mass, while starting the stirring motor 905 to stir.

[0053] S4. The oxygen concentration at different locations inside the tank is monitored by the first oxygen meter 902, the second oxygen meter 903 and the third oxygen meter 904. If the concentration does not meet the standard, the amount of gas to be added is calculated based on the tank's volume, pressure and temperature. A small amount of gas is added through the first pipeline pressure and temperature controller 5 and the second pipeline pressure and temperature controller 6, the first solenoid valve 7 and the second solenoid valve 8, until the concentration at each measuring point is consistent and stable.

[0054] S5. Start the refrigeration unit 18, and then control the second diaphragm press 11 and the third solenoid valve 12 to fill the uniformly mixed gas into the preparation gas cylinder 13.

[0055] In one embodiment of the present invention, the gas replenishment process in S4 employs closed-loop feedback control:

[0056] The control panel 15 compares the oxygen analyzer data with the target concentration in real time. If the concentration is lower than the target value, it controls the supplementation of oxygen; if the concentration is higher than the target value, it controls the supplementation of inert gas. The supplementation flow rate is regulated by the pipeline pressure and temperature controller and the solenoid valve in coordination until the concentration reaches the set range and remains stable for more than the set time.

[0057] Specifically, for example, if you need to prepare 5 bottles of 40L helium-oxygen mixture at 20MPa and 18% oxygen concentration, the calculation shows that (one "unit of gas volume" = the amount of gaseous substance contained in one bottle of pure gas (40L, 20MPa)). .

[0058] At constant temperature, the gas constants R and T are the same, therefore the amount of substance is directly proportional to PV;

[0059] The total amount of gas (amount of substance) in a bottle of pure gas (40L, 20MPa) is recorded as 1 unit;

[0060] The total gas volume of a 40L, 20MPa mixed gas cylinder = The corresponding n is also exactly equal to 1 unit of gas volume (because the pure gas cylinder is also 40L 20MPa).

[0061] This means that when transferring from a pure gas cylinder to a mixed gas cylinder, if the mixed gas cylinder is ultimately 20MPa, the total amount of gas required is the same as the total amount of gas in a pure gas cylinder (1 unit).

[0062] So, in this unit of total gas volume:

[0063] Oxygen constitutes 18% of the gas volume (amount of substance) ⇒ Oxygen content = 0.18 units

[0064] Helium constitutes 82% of the gas volume ⇒ Helium volume = 0.82 units

[0065] Total oxygen content = 5 × 0.18 = 0.90 units, approximately 9298g

[0066] Total helium volume = 5 × 0.82 = 4.10 units, approximately 5298g

[0067] With an additional 15% redundancy, the actual supply is 5 bottles of helium and 2 bottles of oxygen.

[0068] Prepare 5 bottles of helium and 2 bottles of oxygen. Start the membrane press 2 to evacuate residual gas and impurities from the preparation tank 901 (for first-time use). Begin injecting gas into the tank while simultaneously starting the stirring motor 905. Set the control panel 15 to 9298g of oxygen and 5298g of helium according to the electronic scale data. After the gas is injected, stir thoroughly to ensure even mixing until the oxygen concentration values ​​at the three locations are the same and stabilize for more than 10 minutes. If the oxygen concentration display does not reach 18%, the required gas flow rate can be calculated based on the tank's internal volume (500L), pressure, and temperature.

[0069] (For example, if the tank temperature is 15℃, the pressure is 15MPa, and the oxygen concentration is 18.5%, the calculation module on the control panel will calculate:)

[0070] 1. Initial total number of moles of gas in the tank

[0071] Using the ideal gas law:

[0072] Note the units: , :

[0073] 2. Initial number of moles of oxygen:

[0074] Number of moles of helium:

[0075] 3. The number of moles of oxygen remains unchanged after adding pure helium.

[0076] Let the number of moles of helium added be . mol.

[0077] Final total number of moles:

[0078] The number of moles of oxygen remains unchanged:

[0079] Substitute:

[0080] 4. What is the volumetric flow rate of the replenished helium?

[0081] The problem asks "how much flow rate of helium needs to be added", but flow rate is the amount per unit time. Here, we only need to know the total amount to be added (number of moles or standard volume). The problem might be asking: Given a standard volume flow rate... Additional information: How many bid volumes are needed?

[0082] Under standard conditions (0°C, 1 atm): 1 mol of gas ≈ 22.414 L or 0.022414 m³ (standard volume).

[0083] so:

[0084] (Nm³ refers to standard cubic meters)

[0085] If you need the "flow rate," this only refers to the total amount; if you need the flow rate value, you need to add more time. Here, it can be understood as the volume of the added pure helium gas under standard conditions being... Converted to an ambient temperature of 15℃ and standard atmospheric pressure, the volume is 2.059 cubic meters.

[0086] 5. Final tank pressure

[0087] With constant temperature and volume, the total number of moles increases from... Increase to :

[0088]

[0089] The final pressure is approximately 15.42 MPa (absolute pressure);

[0090] After calculation, the pipeline pressure and temperature controller and solenoid valve are activated to control the flow rate and slowly replenish the gas. The replenishment is continuously adjusted based on feedback data of oxygen concentration and preset pressure until the ideal concentration is reached. The entire process can be automated or manually controlled. During gas filling, the refrigeration unit 1801 is activated to prevent the bottle from overheating and resulting in insufficient filling.

[0091] Start the pipeline pressure and temperature controller and solenoid valve to control the flow of gas and replenish it. The gas is continuously replenished based on the oxygen concentration data until the ideal concentration is reached. The whole process can be automatically controlled or manually intervened. During the filling process, the refrigeration unit 1801 is started to prevent the bottle from overheating and causing insufficient filling.

[0092] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An automatic and rapid preparation system for diving mixed gases, characterized in that, The system includes a gas supply module, a gas delivery module, a mixing module, a monitoring and control module, a filling and output module, and a central control module. The gas supply module provides pure oxygen and inert gas. The gas delivery module delivers the gas provided by the gas supply module to the mixing unit at a set flow rate and pressure. The mixing module receives oxygen and inert gas from the gas delivery module and performs physical stirring and uniform mixing. The monitoring and control module collects the oxygen concentration, pressure, and temperature parameters of the gas in the mixing tank (901) in real time and performs dynamic feedback adjustment according to the set target. The filling and output module pressurizes and fills the uniformly mixed gas into the target gas cylinder and implements temperature control during the filling process. The central control module performs gas volume calculation, process control, parameter monitoring and feedback adjustment, and coordinates the above modules to achieve fully automatic, fast, and safe mixed gas preparation.

2. The automatic rapid preparation system for underwater mixed gas according to claim 1, characterized in that, The gas supply module includes: an oxygen source (2), a helium / nitrogen source (4), a first electronic scale (1), and a second electronic scale (3). The first electronic scale (1) is located at the bottom of the oxygen source (2), which is used to provide pure oxygen. The first electronic scale (1) is used to weigh the oxygen source (2) in real time. The second electronic scale (3) is located at the bottom of the helium / nitrogen source (4), which is used to provide inert gas. The second electronic scale (3) is used to weigh the helium / nitrogen source (4) in real time. Both the first electronic scale (1) and the second electronic scale (3) are connected to the central control module to realize the real-time acquisition and feedback of quality data.

3. The automatic rapid preparation system for underwater mixed gas according to claim 2, characterized in that, The gas delivery module includes: a first pipeline pressure and temperature controller (5), a second pipeline pressure and temperature controller (6), a first solenoid valve (7), a second solenoid valve (8), and a gas pipeline (16). The first pipeline pressure and temperature controller (5) and the second pipeline pressure and temperature controller (6) are respectively installed on the oxygen and inert gas delivery pipelines to regulate the gas pressure and temperature in the pipelines. The first solenoid valve (7) and the second solenoid valve (8) are respectively installed on the oxygen and inert gas pipelines and are controlled by the central control module to switch the gas delivery on and off. The gas pipeline (16) is connected to the gas supply module, the mixing module, and the filling and output module to form a gas flow channel.

4. The automatic rapid preparation system for diving mixed gas according to claim 3, characterized in that, The preparation and mixing module includes a preparation component (9), which includes a preparation tank (901), a stirring motor (905), and stirring blades (906). The preparation tank (901) is a closed pressure vessel used to contain and mix gases. The stirring motor (905) is installed at the bottom of the preparation tank (901). The stirring blades (906) are located inside the preparation tank (901) and connected to the output shaft of the stirring motor (905) to force the gas to be stirred to accelerate mixing.

5. The automatic rapid preparation system for diving mixed gas according to claim 4, characterized in that, The monitoring and control module includes a monitoring component and a second pressure gauge (14). The monitoring component includes a first oxygen analyzer (902), a second oxygen analyzer (903), a third oxygen analyzer (904), an electronic thermometer (907), and a first pressure gauge (908). The first oxygen analyzer (902), the second oxygen analyzer (903), the third oxygen analyzer (904), and the electronic thermometer (907) are all located inside the preparation tank (901). The first oxygen analyzer (902), the second oxygen analyzer (903), and the third oxygen analyzer (904) are respectively installed at the top, middle, and bottom of the preparation tank (901) to monitor the oxygen concentration at different heights inside the tank. The electronic thermometer (907) is located at the top inside the preparation tank (901). The first pressure gauge (908) is installed on the preparation tank (901) to monitor the pressure and temperature inside the tank. The second pressure gauge (14) is installed on the filling pipeline to monitor the filling pressure. All sensors are communicatively connected to the central control module.

6. The automatic rapid preparation system for underwater mixed gas according to claim 5, characterized in that, The filling output module includes: a first membrane press (10), a second membrane press (11), a third solenoid valve (12), a preparation gas cylinder (13), and a refrigeration component (18). The first membrane press (10) and the second membrane press (11) are used to provide filling power and pressurize and deliver the mixed gas in the preparation tank (901) to the preparation gas cylinder (13). The third solenoid valve (12) is set on the filling pipeline and is used to control the start and stop of filling. The preparation gas cylinder (13) is the target output container. The refrigeration component (18) is used to cool the gas cylinder during the filling process.

7. The automatic rapid preparation system for underwater mixed gas according to claim 6, characterized in that, The refrigeration assembly (18) includes: a refrigeration unit (1801), a spiral refrigeration pipe (1804), a placement plate (1803), and a side protection plate (1802). The refrigeration unit (1801) is used to provide a cold source. The side protection plate (1802) is used for structural fixation and safety protection. The side of the side protection plate (1802) is provided with a placement plate (1803). The placement plate (1803) is used to support the preparation gas cylinder (13). The upper surface of the placement plate (1803) is provided with a spiral refrigeration pipe (1804). The spiral refrigeration pipe (1804) is wound around the surface of the preparation gas cylinder (13) for conducting cooling.

8. The automatic rapid preparation system for underwater mixed gas according to claim 7, characterized in that, The central control module is a console (15). The console (15) is connected to the first electronic scale (1), the second electronic scale (3), the first pipeline pressure and temperature controller (5), the second pipeline pressure and temperature controller (6), the first solenoid valve (7), the second solenoid valve (8), the third solenoid valve (12), the first oxygen analyzer (902), the second oxygen analyzer (903), the third oxygen analyzer (904), the electronic thermometer (907), the first pressure gauge (908), the second pressure gauge (14), the first membrane press (10), the second membrane press (11), the stirring motor (906), and the refrigerator (1801) via circuit lines (17). The console (15) has built-in control logic, which can automatically calculate the required oxygen and inert gas mass according to the input target gas parameters, and control the evacuation, gas injection, stirring, feedback, correction and replenishment, and filling in sequence.

9. An automatic and rapid preparation method for diving mixed gas, applied to the automatic and rapid preparation system for diving mixed gas according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Calculate the required mass of oxygen and inert gas based on the oxygen concentration, cylinder volume, pressure, and quantity of the target mixed gas, and add a pre-defined proportion of preparation redundancy. S2. Start the first membrane press (10) and the second membrane press (11) to evacuate the preparation tank (901) and remove the residual gas in the tank; S3. Control the opening of the first solenoid valve (7) and the second solenoid valve (8), and inject oxygen and inert gas into the preparation tank (901) according to the calculated mass, while starting the stirring motor (905) to stir. S4. The oxygen concentration at different locations inside the tank is monitored by the first oxygen meter (902), the second oxygen meter (903) and the third oxygen meter (904). If the concentration does not meet the standard, the amount of gas to be added is calculated based on the tank volume, pressure and temperature. A small amount of gas is added through the first pipeline pressure and temperature controller (5) and the second pipeline pressure and temperature controller (6), the first solenoid valve (7) and the second solenoid valve (8) until the concentration at each measuring point is consistent and stable. S5. Start the refrigeration unit (18), and then control the second diaphragm press (11) and the third solenoid valve (12) to fill the uniformly mixed gas into the preparation gas cylinder (13).

10. The automatic and rapid preparation method for a diving mixed gas according to claim 9, characterized in that, The gas replenishment process in S4 employs closed-loop feedback control: The control panel (15) compares the oxygen meter data with the target concentration in real time. If the concentration is lower than the target value, it controls the supplementation of oxygen; if the concentration is higher than the target value, it controls the supplementation of inert gas. The supplementation flow rate is regulated by the pipeline pressure and temperature controller and the solenoid valve in coordination until the concentration reaches the set range and remains stable for more than the set time.

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