Mixing device and mixing method of gas charging and distributing system

Abstract

The invention relates to the technical field of gas charging and distributing, in particular to a mixing device and a mixing method of a gas charging and distributing system. The invention discloses a mixing device and a mixing method of a gas charging and distributing system. The device comprises a mixing tank, a stirring device, a gas analyzer and a control system, wherein the mixing tank is a stainless steel vertical tank, the stirring device is arranged at the bottom of the mixing tank and comprises fan blades, a magnetic transmission device and a motor, the motor is installed outside the mixing tank, the magnetic transmission device and the fan blades are installed inside the mixing tank, and the magnetic transmission device is connected with the external motor and used for converting rotation of the motor into rotation of the fan blades; the gas analyzer is connected with the mixing tank through an upper group of one-way valves, a middle group of one-way valves, a lower group of one-way valves, electromagnetic valves and pipelines, and is used for monitoring the concentrations of mixed gases at the upper part, the middle part and the lower part; the gas analyzer is connected with the control system through a data acquisition link, and the control system is used for controlling the rotating speed of the stirring device according to the concentration of each mixed gas uploaded by the gas analyzer through a proportional-integral-derivative control algorithm.

Description

Technical Field

[0001] The invention relates to the technical field of gas charging and distributing, and in particular to a mixing device and a mixing method of a gas charging and distributing system. Background Art

[0002] The main task of the gas filling system is to mix different gases (such as nitrogen, helium, oxygen, etc.) in a predetermined ratio, which usually requires a high degree of accuracy to ensure that the gas mixing ratio accuracy and mixing uniformity strictly meet the standards. If the mixing accuracy is not enough, the ratio of nitrogen, helium, oxygen or helium-oxygen mixed gas filled into the gas cylinder cannot meet the requirements for safe use, which will cause very serious casualties.

[0003] At present, the gas mixing method of the gas filling system is usually to tumble the gas cylinder, which uses the principle of centrifugal force to accelerate the gas mixing. This is time-consuming and occupies a large area. In addition, the gas concentration analyzer is often close to the bottle mouth. It is impossible to detect whether the mixing is uniform at a position far away from the bottle mouth, and high mixing accuracy cannot be guaranteed. Summary of the invention

[0004] The embodiments described herein provide a mixing device and a mixing method for a charging gas system and a computer-readable storage medium storing a computer program.

[0005] According to a first aspect of the present invention, a mixing device of a gas filling system is provided, comprising: a mixing tank, a stirring device, a gas analyzer and a control system; the mixing tank is a stainless steel vertical tank, the stirring device is arranged at the bottom of the mixing tank, and comprises fan blades, a magnetic transmission device and a motor, the motor is installed outside the mixing tank, the magnetic transmission device and the fan blades are installed inside the mixing tank, the magnetic transmission device is connected to the external motor, and is used to convert the rotation of the motor into the rotation of the fan blades; the gas analyzer is connected to the mixing tank through three groups of one-way valves, solenoid valves and pipelines at the upper, middle and lower parts, and is used to monitor the concentration of each mixed gas at the upper, middle and lower parts; the gas analyzer is connected to the control system through a data acquisition link, and the control system is used to control the rotation speed of the stirring device according to the concentration of each mixed gas uploaded by the gas analyzer through a proportional integral differential control algorithm.

[0006] In some embodiments of the present disclosure, an inspection port is provided on the tank body of the mixing tank, and a pressure gauge, a safety valve and a solenoid valve are provided on the top.

[0007] In some embodiments of the present disclosure, a motor outside the mixing tank is installed at a position corresponding to the magnetic transmission device. The motor and the magnetic rotating torque device generate a rotational torque through magnetic coupling to drive the fan blades at a 45° angle position at the bottom of the mixing tank to rotate.

[0008] In some embodiments of the present disclosure, the control system connects the solenoid valve and the motor through a PLC controller, and is used to close the solenoid valve on the top of the mixing tank to seal the mixing tank after receiving an instruction that the mixed gas preparation is completed, open the solenoid valve leading to the gas analyzer, and start the stirring device; during the stirring process, the concentration data of the gas analyzer is collected in real time, and the control instruction is output to the stirring device based on the proportional integral differential control algorithm, so that the stirring device rotates at the speed required by the control instruction.

[0009] In some embodiments of the present disclosure, when the mixed gases in the upper, middle and lower parts of the mixing tank are evenly mixed, the control system is suitable for sending a stop command to the stirring device through the PLC controller, and the stirring device stops running to complete the mixing process.

[0010] In some embodiments of the present disclosure, the control system is used to monitor the pressure of the mixing tank in real time, and determine whether the pressure value during the mixing process exceeds the opening pressure of the mixing tank safety valve or whether the pressure drop value exceeds a preset threshold value. If the opening pressure is exceeded or the drop value exceeds the preset threshold value, a warning message is prompted and all solenoid valves and stirring devices are closed.

[0011] In some embodiments of the present disclosure, the control system is communicatively connected to a remote monitoring platform for recording concentration data, pressure data, and stirring speed into a database, and dynamically adjusting PID parameters by optimizing a PID algorithm.

[0012] According to a second aspect of the present disclosure, a mixing method of a gas charging system is provided, which is performed based on the mixing device of the gas charging system according to the first aspect of the present disclosure, and the method comprises: After receiving the command that the gas preparation is completed, close the solenoid valve on the top of the mixing tank, open the solenoid valve leading to the gas analyzer, and start the stirring device; monitor in real time the gas concentration values ​​at the upper, middle, and lower positions of the mixing tank collected by the gas analyzer and the pressure value of the pressure gauge at the top of the mixing tank; determine whether the gas concentration values ​​of the mixed gases at the upper, middle, and lower positions of the mixing tank reach the preset values. If not, adjust the rotation speed of the stirring device based on the PID control algorithm output control instructions until the gas concentration values ​​reach the preset values; and determine whether the pressure value exceeds the opening pressure of the mixing tank safety valve or the pressure drop value exceeds the preset threshold. If it exceeds the opening pressure or the drop value exceeds the preset threshold, a warning message is prompted and all solenoid valves and stirring devices are closed.

[0013] In some embodiments of the present disclosure, the method further includes: when the mixed gases in the upper, middle and lower parts of the mixing tank are evenly mixed, a stop command is sent to the stirring device through the PLC controller, and the stirring device stops running to complete the mixing process.

[0014] In some embodiments of the present disclosure, the method further includes: recording the concentration data, pressure data, and stirring speed into a database, and dynamically adjusting the PID parameters by optimizing the PID algorithm.

[0015] According to a third aspect of the present disclosure, a computer-readable storage medium storing a computer program is provided, wherein the computer program, when executed by a processor, implements the steps of the mixing method of the charging and discharging system according to the second aspect of the present disclosure.

[0016] In summary, the mixing device and method of the gas charging system provided by the present invention can at least achieve the following technical effects: Through the combination of advanced technologies such as multi-point concentration monitoring, magnetic transmission, PID control algorithm, etc., more precise and intelligent gas mixing control can be achieved, significantly improving the operational safety, efficiency and economy of the system.

[0017] Specifically, combined with the real-time data fed back by the gas analyzer, the control system can accurately adjust the speed of the stirring device and optimize the mixing process through the proportional integral differential (PID) control algorithm. This control method can not only improve the efficiency of gas mixing, but also ensure that different gas components are evenly distributed in the mixing tank, avoiding the problem of uneven gas concentration caused by insufficient or excessive stirring.

[0018] The use of magnetic transmission system can eliminate mechanical friction, reduce wear and energy loss, and avoid direct contact between the motor and the internal environment of the mixing tank, reducing the maintenance requirements of the equipment. The stirring intensity can be adjusted according to different gas composition and concentration requirements to adapt to more complex and variable gas mixing tasks.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below. It should be noted that the drawings described below only relate to some embodiments of the present disclosure, but are not intended to limit the present disclosure, wherein: Figure 1 A schematic structural diagram of a mixing device of a gas charging system according to an embodiment of the present invention is shown; Figure 2 A schematic structural diagram of a mixing device of a gas charging system according to another embodiment of the present invention is shown; Figure 3A schematic flow chart of a mixing method for a gas charging system according to an embodiment of the present disclosure is shown.

[0021] It should be noted that the elements in the drawings are schematic and not drawn to scale. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative work also fall within the scope of protection of the present disclosure.

[0023] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which the subject matter of the present disclosure belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meanings in the context of the specification and the relevant art, and will not be interpreted in an idealized or overly formal form unless otherwise explicitly defined herein. In addition, terms such as "first" and "second" are only used to distinguish one component (or a portion of a component) from another component (or another portion of a component).

[0024] In order to solve the technical problems existing in the tumbling gas mixing method, the embodiments of the present invention provide a mixing device and a mixing method for a fully automatic gas filling system, which have small mixing site requirements, large mixed gas capacity at one time, high mixing efficiency, high mixing accuracy, simple operation, and a fully automatic mixing system. The method of stirring and mixing is carried out inside a mixing tank, and nitrogen, helium, oxygen and other gases are accurately mixed in predetermined proportions through precise flow control valves and gas proportion mixing devices, and the gas concentration is monitored by high-precision sensors to ensure uniform mixing.

[0025] In some embodiments of the present disclosure, the mixing device of the gas filling system includes a mixing tank, a stirring device, a gas analyzer and a control system. The mixing tank is a stainless steel vertical tank, and the stirring device is arranged at the bottom of the mixing tank, including fan blades, a magnetic transmission device and a motor. The motor is installed outside the mixing tank, and the magnetic transmission device and the fan blades are installed inside the mixing tank. The magnetic transmission device is connected to the external motor to convert the rotation of the motor into the rotation of the fan blades. The gas analyzer is connected to the mixing tank through three groups of one-way valves, solenoid valves and pipelines at the upper, middle and lower parts, and is used to monitor the concentration of each mixed gas at the upper, middle and lower parts; the gas analyzer is connected to the control system through a data acquisition link, and the control system controls the rotation speed of the stirring device according to the concentration of each mixed gas uploaded by the gas analyzer through a proportional integral differential control algorithm.

[0026] Figure 1 FIG. 2 shows a schematic diagram of the structure of a mixing device of a gas charging system according to an embodiment of the present invention. Figure 1 As shown, the mixing device is mainly composed of a mixing tank, a stirring device, a gas analyzer, a control system, a safety valve, four solenoid valves, three one-way valves and several pipelines.

[0027] The mixing tank is a stainless steel vertical tank. The stirring device is set at the bottom of the mixing tank. The tank body of the mixing tank is provided with an inspection port to facilitate the inspection of equipment and cleaning of dirt. The top of the tank is provided with a pressure gauge, a safety valve and a solenoid valve to ensure the safe operation of the mixing tank. The gas analyzer is connected to the mixing tank through three sets of check valves, solenoid valves and pipelines at the upper, middle and lower levels. The gas analyzer is connected to the control system through a data acquisition link. The control system is connected to each solenoid valve and stirring device to control the opening or closing of the solenoid valve and stirring device.

[0028] In some embodiments of the present disclosure, the mixing tank is a stainless steel vertical tank with a diameter of 460 mm, a height of 1200 mm, a wall thickness of about 30 mm, a volume of 100 L, and a maximum pressure of 22 MPa. The mixing device using the mixing tank requires a small area, and the floor area of ​​one mixing tank is only 0.17 square meters. The mixing tank does not need to be moved, and no human intervention is required when mixing nitrogen, helium, oxygen or helium-oxygen mixed gases.

[0029] Figure 2 FIG. 2 shows a schematic diagram of a mixing device of a gas charging system according to another embodiment of the present invention. Figure 2 As shown, the mixing device consists of 2 mixing tanks, 2 stirring devices, a gas analyzer, 2 safety valves, a control system, 8 solenoid valves, 6 one-way valves and several pipelines.

[0030] The mixing tank is a stainless steel vertical tank with a stirring device at the bottom. Each mixing tank is equipped with an inspection port for easy maintenance of equipment and cleaning of dirt. A pressure gauge, safety valve and solenoid valve are installed on the top of the tank to ensure the safe operation of the mixing tank. The gas analyzer is connected to the two mixing tanks through three sets of one-way valves, solenoid valves and pipelines at the upper, middle and lower levels. The gas analyzer is connected to the control system through a data acquisition link, and the control system is connected to each solenoid valve and stirring device to control the opening or closing of the solenoid valve and stirring device.

[0031] The mixing tank is a stainless steel vertical tank with a diameter of 460mm, a height of 1200mm, a wall thickness of about 30mm, a volume of 100L, and a maximum pressure of 22MPa. The floor space of two mixing tanks is only 0.34 square meters. The rated pressure of the mixing tank is 20MPa. The gas volume of nitrogen, helium and oxygen or helium and oxygen mixed gas mixed in two mixing tanks at one time is equivalent to 6.6 bottles of 40L, 15MPa mixed gas cylinders used in the tumbling mixing method. The number of mixing tanks can be adjusted according to actual application needs.

[0032] In some embodiments of the present disclosure, the motor outside the mixing tank is installed at a position corresponding to the magnetic transmission device. The motor and the magnetic rotating torque device generate a rotational torque through magnetic coupling to drive the fan blades at a 45° angle position at the bottom of the mixing tank to rotate. The magnetic coupling principle enables the stirring device to transmit rotational torque without physical contact, avoiding excessive wear of the mechanical device and eliminating the need for traditional mechanical seals, which effectively solves the problem of dynamic sealing under high pressure environments. The fan blades rotate in the mixing tank, which can quickly and evenly mix the nitrogen, helium and oxygen or helium-oxygen mixed gases, greatly improving the mixing efficiency. The highest mixing efficiency can reach 80 times that of the existing tumbling mixing method. By controlling the stirring device (motor), the start and stop of the mixing process can be accurately controlled.

[0033] According to some embodiments of the present disclosure, the gas filling and dispensing system mixes the gas in a mixing tank. When the gas preparation is completed, the control system automatically executes the intelligent program through the PLC. The intelligent program is embedded in the PLC and is responsible for performing PID control based on the data provided by the analyzer, controlling the speed of the stirring device, and ensuring uniform mixing. The gas analyzer monitors the gas concentration at three locations through the one-way valves and solenoid valves at the upper, middle, and lower parts of the mixing tank. By monitoring the gas concentration at different locations in real time, the gas analyzer ensures that the gas composition during the mixing process is balanced between the upper, middle, and lower layers.

[0034] The control system connects the solenoid valve and the motor through the PLC controller. After receiving the mixed gas preparation completion instruction, it closes the solenoid valve on the top of the mixing tank to seal the mixing tank, opens the solenoid valve leading to the gas analyzer, and starts the stirring device; collects the concentration data of the gas analyzer using the proportional integral differential control algorithm (PID), and outputs the control instruction to the stirring device after calculation. The speed of the stirring device rotates according to the requirements of the control instruction. When the mixed gas in the upper, middle and lower parts of the mixing tank is evenly mixed, the intelligent program sends a stirring device stop instruction through the PLC, and the stirring device stops running, completing the mixing process to control the opening or closing of the solenoid valve and the motor.

[0035] Among them, the PID control algorithm fine-tunes the stirring device according to the concentration data fed back by the gas analyzer. If the gas concentration is uneven, the PID algorithm will adjust the speed of the stirring device until the gas concentration in the mixing tank reaches a predetermined uniform state. Proportional (P) is used to respond to concentration deviations. Integral (I) is used to eliminate long-term deviations. Differential (D) is used to deal with the speed of concentration changes. When performing a mixing uniformity analysis, the concentration data of each position point is compared. If the concentration difference between different position points is small, it means that the gas mixing is relatively uniform; if the difference is large, it means that the mixing is uneven, and further adjustment of the stirring or mixing conditions may be required. When the concentration of the mixed gas reaches a uniform state, the PLC sends a stop command to stop the operation of the stirring device, thereby completing the mixing process.

[0036] By optimizing the PID algorithm, the control system can dynamically adjust the PID parameters under various operating conditions (such as the initial mixing stage and the later fine-tuning stage) to better adapt to different mixing requirements.

[0037] In some embodiments of the present disclosure, the control system is also used to monitor the pressure of the mixing tank in real time, and to determine whether the pressure value during the mixing process exceeds the opening pressure of the mixing tank safety valve or whether the pressure drop value exceeds a preset threshold, such as 1Mpa. If the opening pressure is exceeded or the drop value exceeds the preset threshold, a warning message is prompted, and all solenoid valves and stirring devices are closed to avoid equipment damage or safety hazards.

[0038] By recording key parameters such as concentration data, pressure data, stirring speed, etc. into the database, it is convenient for subsequent analysis, debugging and optimization. Integrating the system into the remote monitoring platform allows operators to remotely view the equipment status and adjust the control parameters, further improving the intelligence and flexibility of the system.

[0039] The mixing device provided in the embodiments of the present disclosure is suitable for scenarios where precise gas mixing is required under high-pressure environments, such as gas preparation, gas chemical reactions, high-pressure reactors, gas storage and transportation equipment, etc. The system can be further integrated into an automated control system to support remote monitoring and adjustment, making the mixing process more controllable and intelligent.

[0040] Figure 3 A schematic flow chart of a hybrid method for a gas charging system according to an embodiment of the present disclosure is shown. Figure 3 As shown, after receiving the gas preparation completion instruction, the control system closes the solenoid valve on the top of the mixing tank through the PLC controller, opens the solenoid valve leading to the gas analyzer, and starts the stirring device.

[0041] During the mixing process, the gas concentration values ​​at the upper, middle and lower positions of the mixing tank and the pressure value of the pressure gauge at the top of the mixing tank collected by the gas analyzer are monitored in real time.

[0042] On the one hand, it is determined whether the concentration values ​​of the mixed gases at the upper, middle and lower positions of the mixing tank have reached the preset values. If not, the control instructions are output based on the PID control algorithm to adjust the speed of the stirring device until the concentration values ​​of the gases reach the preset values. When the concentration values ​​of the gases reach the preset values, that is, the mixed gases at the upper, middle and lower positions of the mixing tank are evenly mixed, a stop instruction is sent to the stirring device and the solenoid valve through the PLC controller, and the stirring device stops running, indicating that the mixing process is completed.

[0043] On the other hand, it is determined whether the pressure value exceeds the opening pressure of the mixing tank safety valve or whether the pressure drop value exceeds the preset threshold. If it exceeds the opening pressure or the drop value exceeds the preset threshold, an early warning message is prompted for timely maintenance and all solenoid valves and stirring devices are closed.

[0044] It is also possible to communicate with the remote monitoring platform to record concentration data, pressure data, and stirring speed into the database, and dynamically adjust PID parameters by optimizing the PID algorithm, so that the mixing device can cope with different mixing requirements and has greater flexibility and adaptability.

[0045] In other embodiments of the present disclosure, a computer-readable storage medium storing a computer program is further provided, wherein the computer program can achieve the following when executed by a processor: Figure 3 The steps of the mixing method of the charging system are shown.

[0046] In summary, the mixing device and mixing method of the gas charging system provided by the present invention can at least achieve the following technical effects: Through the combination of advanced technologies such as multi-point concentration monitoring, magnetic transmission, PID control algorithm, etc., more precise and intelligent gas mixing control can be achieved, significantly improving the operational safety, efficiency and economy of the system.

[0047] Specifically, combined with the real-time data fed back by the gas analyzer, the control system can accurately adjust the speed of the stirring device and optimize the mixing process through the proportional integral differential (PID) control algorithm. This control method can not only improve the efficiency of gas mixing, but also ensure that different gas components are evenly distributed in the mixing tank, avoiding the problem of uneven gas concentration caused by insufficient or excessive stirring.

[0048] The use of magnetic transmission system can eliminate mechanical friction, reduce wear and energy loss, and avoid direct contact between the motor and the internal environment of the mixing tank, reducing the maintenance requirements of the equipment. The stirring intensity can be adjusted according to different gas composition and concentration requirements to adapt to more complex and variable gas mixing tasks.

[0049] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0050] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the following intention: that the claimed invention requires more features than the features explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0051] Those skilled in the art will appreciate that the modules or units or components of the devices in the examples disclosed herein may be arranged in the devices described in the embodiment, or alternatively may be located in one or more devices different from the devices in the examples. The modules in the foregoing examples may be combined into one module or may be divided into multiple submodules.

[0052] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and further may be divided into a plurality of submodules or subunits or subcomponents. All features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device so disclosed may be combined in any combination, except that at least some of such features and / or processes or units are mutually exclusive. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0053] In addition, some of the embodiments are described herein as methods or combinations of method elements that can be implemented by a processor of a computer system or by other devices that perform the functions. Therefore, a processor with necessary instructions for implementing the method or method elements forms a device for implementing the method or method elements. In addition, the elements described herein of the device embodiments are examples of devices for implementing the functions performed by the elements for the purpose of implementing the invention.

[0054] Although the present invention has been described according to a limited number of embodiments, it will be apparent to those skilled in the art, with the benefit of the above description, that other embodiments may be envisioned within the scope of the invention thus described. In addition, it should be noted that the language used in this specification is selected primarily for readability and teaching purposes, rather than for explaining or defining the subject matter of the present invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is illustrative and not restrictive with respect to the scope of the present invention, and the scope of the present invention is defined by the appended claims.

Claims

1. A mixing device for a gas filling system, characterized in that: include: A mixing tank, a stirring device, a gas analyzer and a control system; the mixing tank is a stainless steel vertical tank, the stirring device is arranged at the bottom of the mixing tank, and includes fan blades, a magnetic transmission device and a motor, the motor is installed on the outside of the mixing tank, the magnetic transmission device and the fan blades are installed inside the mixing tank, the magnetic transmission device is connected to the external motor, and is used to convert the rotation of the motor into the rotation of the fan blades; the gas analyzer is connected to the mixing tank through three groups of one-way valves, solenoid valves and pipelines at the upper, middle and lower parts, and is used to monitor the concentrations of each mixed gas at the upper, middle and lower parts; the gas analyzer is connected to the control system through a data acquisition link, and the control system is used to control the rotation speed of the stirring device according to the concentrations of each mixed gas uploaded by the gas analyzer through a proportional integral differential control algorithm.

2. The mixing device according to claim 1, characterized in that The tank body of the mixing tank is provided with an inspection port, and the top is provided with a pressure gauge, a safety valve and a solenoid valve.

3. The mixing device according to claim 1, characterized in that The motor outside the mixing tank is installed at a position corresponding to the magnetic transmission device. The motor and the magnetic rotating torque device generate a rotating torque through magnetic coupling to drive the fan blades at a 45° angle position at the bottom of the mixing tank to rotate.

4. The mixing device according to claim 1, characterized in that The control system is connected to the solenoid valve and the motor through a PLC controller, and is used to close the solenoid valve on the top of the mixing tank to seal the mixing tank after receiving an instruction on the completion of mixed gas preparation, open the solenoid valve leading to the gas analyzer, and start the stirring device; during the stirring process, concentration data of the gas analyzer is collected in real time, and a control instruction is output to the stirring device based on a proportional-integral-differential control algorithm, so that the stirring device rotates at a speed required by the control instruction.

5. The mixing device according to claim 4, characterized in that When the mixed gases in the upper, middle and lower parts of the mixing tank are evenly mixed, the control system is suitable for sending a stop instruction to the stirring device through the PLC controller, and the stirring device stops running, completing the mixing process.

6. The mixing device according to claim 4, characterized in that The control system is used to monitor the pressure of the mixing tank in real time, and determine whether the pressure value during the mixing process exceeds the opening pressure of the mixing tank safety valve or whether the pressure drop value exceeds a preset threshold. If it exceeds the opening pressure or the drop value exceeds the preset threshold, an early warning message is prompted and all solenoid valves and the stirring device are closed.

7. The mixing device according to claim 4, characterized in that The control system is connected to the remote monitoring platform for communication, and is used to record the concentration data, pressure data, and stirring speed into a database, and dynamically adjust the PID parameters by optimizing the PID algorithm.

8. A mixing method for a gas filling system, performed based on the mixing device described in any one of claims 1 to 7, characterized in that: include: After receiving the gas preparation completion instruction, close the solenoid valve on the top of the mixing tank, open the solenoid valve leading to the gas analyzer, and start the stirring device; Real-time monitoring of the gas concentration values ​​at the top, middle and bottom of the mixing tank collected by the gas analyzer and the pressure value of the pressure gauge at the top of the mixing tank; Determine whether the concentration values ​​of the mixed gases at the upper, middle and lower positions of the mixing tank have reached a preset value. If not, adjust the speed of the stirring device based on the PID control algorithm output control instructions until the concentration values ​​of the gases reach the preset value. as well as Determine whether the pressure value exceeds the opening pressure of the mixing tank safety valve or whether the pressure drop value exceeds the preset threshold. If it exceeds the opening pressure or the drop value exceeds the preset threshold, a warning message will be prompted and all solenoid valves and stirring devices will be closed.

9. The control method of the mixing device of the charging and distributing system according to claim 8, characterized in that: The method further comprises: when the mixed gases in the upper, middle and lower parts of the mixing tank are evenly mixed, a stop instruction is sent to the stirring device through a PLC controller, and the stirring device stops running, thus completing the mixing process.

10. The control method of the mixing device of the charging and distributing system according to claim 8, characterized in that: The method further comprises: The concentration data, pressure data, and stirring speed are recorded in the database, and the PID parameters are dynamically adjusted by optimizing the PID algorithm.

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