Gas mixing system based on high-pressure proportional valve control

Abstract

The invention relates to the field of gas mixing systems, and discloses a gas mixing system based on high-pressure proportional valve control. The system comprises at least two gas branches, and each gas branch is provided with a high-pressure proportional valve communicated with a gas inlet and a one-way valve located at the downstream of the high-pressure proportional valve. The mixing unit is used for mixing the gas of each gas branch in a high-pressure state; the energy storage unit is communicated with the mixing unit and is used for temporarily storing the mixed high-pressure gas; the detection control unit comprises a gas analyzer communicated with the energy storage unit and a controller electrically connected with the gas analyzer, and the controller adjusts the opening degree of the high-pressure proportional valve in a closed-loop mode according to detection signals of the gas analyzer, so that the target component concentration of the mixed high-pressure gas is maintained within a preset range. The system can directly realize accurate proportioning and dynamic adjustment of multi-component gas on a high-pressure side, reduces lag and energy consumption of a low-pressure mixing scheme, and is suitable for high-pressure laser welding, material testing and other scenes needing quick response and high-precision proportion control.

Description

Technical Field

[0001] This invention relates to the field of gas mixing systems, specifically a gas mixing system based on high-pressure proportional valve control. Background Technology

[0002] In manufacturing scenarios with intense heat input, such as high-temperature laser welding, the shielding gas must not only form a stable gas curtain in a very short time to prevent oxygen and water vapor from entering the molten pool, but also suppress the laser plasma plume, ensure sufficient laser beam energy coupling, and improve the fluidity of the molten pool. Industrially, a mixed gas with nitrogen as the main component and trace amounts of oxygen in the hundreds to thousands of ppm range is commonly used to balance cost, weld mechanical properties, and surface finish quality. Since welding equipment typically supplies gas continuously on high-pressure pipelines at 10–30 MPa, and laser pulse frequencies can reach the kHz level, the shielding gas ratio must have millisecond-level adjustment speed and a concentration error of less than ±0.5 volume fraction percentage. However, currently, obtaining this type of mixed gas mainly relies on the following three technical routes. First, directly replacing premixed high-pressure cylinders, but different ratios require multiple cylinder sets, leading to frequent downtime and failing to meet the process's requirements for dynamic concentration switching. Secondly, the method involves reducing the pressure of each gas source to a low-pressure zone through multiple stages, and then mixing them at atmospheric or low pressure after flow metering by a mass flow controller. This approach results in lengthy pipelines, high energy consumption for secondary compression, and the mechanical inertia of the mass flow controller leading to response times measured in seconds, making it impossible to synchronize with welding power pulses. Furthermore, the low-pressure section is susceptible to backflow of air and adsorption from the pipe walls, causing fluctuations in micro-oxygen content that often exceed ±0.5 volume fractions. Thirdly, manual proportional gas mixing using float flow meters or manual needle valves is highly dependent on operator experience and environmental fluctuations, with long-term errors generally not exceeding ±3 volume fractions, making it difficult to maintain stability on automated welding production lines.

[0003] High-pressure proportional valves are electro-hydraulic (electrical) components that precisely control valve core displacement via electrical signals, directly achieving linear flow or pressure regulation at pressures above 20 MPa. They have been maturely applied in hydraulic servo systems, material fatigue testing, and high-pressure pneumatic actuators, possessing comprehensive advantages such as high precision, rapid response, and high pressure resistance. However, existing public information and industrial practices do not utilize high-pressure proportional valves for gas mixing. On one hand, the low density and high compressibility of the gas medium make it difficult to directly apply calibration methods and closed-loop algorithms used in hydraulic applications; on the other hand, the industry habitually follows a process route of "multi-stage pressure reduction—mass flow controller—low-pressure mixing," lacking mature experience and equipment selection for direct metering on the high-pressure side. Therefore, existing technologies for preparing shielding gases in high-pressure laser welding generally suffer from problems such as large equipment size, high energy consumption, slow response, poor accuracy in controlling trace oxygen content, and high leakage risk due to numerous interfaces, severely restricting high-end welding quality, production efficiency, and on-site safety levels. Summary of the Invention

[0004] The purpose of this invention is to provide a gas mixing system based on high-pressure proportional valve control to solve the technical problems mentioned in the background art.

[0005] Based on the above ideas, the present invention provides the following technical solution:

[0006] A gas mixing system based on high-pressure proportional valve control, comprising:

[0007] The system comprises a first gas branch, a second gas branch, an energy storage unit, and a detection and control unit.

[0008] The first gas branch has a first gas inlet;

[0009] A first high-pressure proportional valve, the inlet of which is connected to the first gas inlet;

[0010] The first check valve is located downstream of the outlet of the first high-pressure proportional valve and is used to block backflow.

[0011] The second gas branch has a second gas inlet;

[0012] The second high-pressure proportional valve has its inlet connected to the second gas inlet.

[0013] The second check valve is located downstream of the outlet of the second high-pressure proportional valve.

[0014] A regulating valve is located downstream of the second gas branch and is used to finely adjust the instantaneous flow rate of the second gas branch.

[0015] The energy storage unit includes a gas storage cylinder, which is used to temporarily store the output mixed high-pressure gas;

[0016] The detection and control unit includes a gas analyzer, the sampling end of which is connected to the gas storage tank, for real-time detection of the concentration of the target component in the mixed high-pressure gas;

[0017] The control panel includes a controller, which is electrically connected to the gas analyzer and adjusts the opening of the first high-pressure proportional valve and the second high-pressure proportional valve in a closed loop according to the detection signal of the gas analyzer, so as to maintain the concentration of the target component within a preset range.

[0018] The mixer outlet is connected to the discharge end of the gas analyzer and is used to output the proportioned high-pressure mixed gas.

[0019] For the first time, a high-pressure proportional valve, traditionally used in hydraulics, pneumatics, and industrial automation, is introduced into a high-pressure gas mixing scenario. Utilizing its closed-loop drive characteristics, it directly controls the proportional distribution of oxygen and nitrogen. The valve core displacement and channel opening of the high-pressure proportional valve are linearly related, allowing for real-time correction by a PID algorithm, thus achieving low steady-state error near the concentration setpoint. Simultaneously, its sub-millisecond drive response compensates for disturbances caused by pressure pulsations within the gas reservoir, making the purity fluctuations of the mixed gas controllable. Compared to common solutions, this system eliminates the need for a two-stage pressure reducing device and a multi-branch mass flow controller, reducing energy consumption and device size. It also achieves purity locking on the high-pressure side in a single operation, making it suitable for operating conditions with extremely stringent requirements for both high pressure and stability.

[0020] Preferably, the first gas branch, the second gas branch, the energy storage unit, and the detection and control unit are all housed inside the chassis, and the bottom of the chassis is provided with a base.

[0021] By compactly integrating two gas branches and the entire closed-loop detection and control link into a chassis and providing support with a base, an integrated mobile workstation can be formed. This structure shortens the piping and reduces potential leakage points. The base optimizes the distribution of the internal center of gravity, and the rigid frame can absorb external vibration and shock.

[0022] Preferably, the first gas branch also has a first filter, which is located downstream of the first check valve.

[0023] The first filter is located downstream of the first one-way valve, allowing oxygen to undergo particle filtration before entering the three-way connector, effectively blocking particles such as rust and oil mist from inside the oxygen cylinder.

[0024] Preferably, the second gas branch also has a second filter, which is located downstream of the second check valve.

[0025] The second filter acts on the nitrogen branch, ensuring that the oxygen / nitrogen dual-path filtration specifications are at the same level, thus eliminating the impact of differences in gas source cleanliness on the control accuracy of the proportional valve.

[0026] Preferably, the system further includes a mixing unit, which includes a three-way connector. The three-way connector has at least two inlets that are respectively connected to the first filter and the regulating valve, and the outlet of the three-way connector is connected to the air storage tank.

[0027] The tee connector enables instantaneous turbulent mixing of two clean, high-pressure gases within a millimeter-level cavity, followed by pressure equalization via a gas storage tank, thus shortening the mixing completion time. The rapid response of the high-pressure proportional valve ensures immediate adjustment of the two branch flow rates even with minor deviations in gas concentration, allowing the mixing ratio output from the tee connector to recover to the target value within milliseconds. This effectively avoids step-like fluctuations, improves the overall system frequency response, and enables closed-loop bandwidth through a controller, meeting the stringent requirements for high-frequency concentration stability, such as in pressure cycling testing machines.

[0028] Preferably, the first gas inlet is an oxygen inlet and the second gas inlet is a nitrogen inlet.

[0029] Preferably, the gas analyzer is a nitrogen analyzer.

[0030] Preferably, the controller receives a concentration signal from the gas analyzer and simultaneously adjusts the opening of the first high-pressure proportional valve (8) and the second high-pressure proportional valve to maintain a preset target concentration of nitrogen.

[0031] The controller uses the nitrogen analyzer output as the sole feedback variable and employs a dual-valve linkage strategy, enabling the first and second high-pressure proportional valves to adjust synchronously based on the same error signal. Thanks to the high opening-flow linearity and fast dynamic response of the high-pressure proportional valves, the system can complete step concentration settings and achieve steady-state convergence without significant oscillations or overshoot. Compared to traditional single-valve or position-based MFC calibration methods, this fully leverages the combined advantages of high precision, rapid response, and high-pressure adaptability of the high-pressure proportional valves.

[0032] The beneficial effects of this invention are:

[0033] The high-pressure proportional valve can directly adjust the flow rate of the oxygen and nitrogen branches, eliminating the need for multi-stage pressure reduction and low-pressure proportioning, and avoiding recompression losses and the risk of secondary pollution.

[0034] The displacement of the high-pressure proportional valve spool is linearly related to the channel opening, and closed-loop bandwidth can be achieved by combining it with PID / fuzzy algorithms. When the load changes abruptly or the target concentration changes stepwise, the dual-valve coordinated regulation can achieve convergence without overshoot. Compared with the traditional MFC regulation scheme, the dynamic response time is shortened and the concentration fluctuation amplitude is reduced, meeting the extremely demanding requirements of material fatigue testing machines, high-pressure cyclic testing, and other applications with stringent frequency response requirements.

[0035] The high-pressure proportional valve adopts a thickened valve sleeve and hard diaphragm sealing structure, which can withstand operating pressure for a long time without leakage or jamming. Only one-way valves and particulate filters are needed before and after the valve to meet the cleanliness requirements, reducing the number of pipeline nodes in the whole unit and simultaneously reducing potential leakage points and maintenance positions. The wear resistance of the valve body is improved, and the calibration curve drifts by less than 3% after long-term high-pressure cycling, enabling the system to operate stably in high-impact and high-vibration environments such as mobile rescue stations and emergency gas supply in the field, significantly extending the maintenance cycle and ensuring the safety of personnel and equipment. Attached Figure Description

[0036] Figure 1 This is a front view of an embodiment 1 of a gas mixing system based on high-pressure proportional valve control according to the present invention.

[0037] Figure 2 This is a left view of Embodiment 1 of a gas mixing system based on high-pressure proportional valve control according to the present invention.

[0038] Figure 3 This is a right view of Embodiment 1 of a gas mixing system based on high-pressure proportional valve control according to the present invention.

[0039] Figure 4 This is a side view of an embodiment 2 of a gas mixing system based on high-pressure proportional valve control according to the present invention.

[0040] Figure 5 This is a perspective view of a second embodiment of a gas mixing system based on high-pressure proportional valve control according to the present invention.

[0041] 1. Control panel; 2. First check valve; 3. First filter; 4. Regulating valve; 5. Second check valve; 6. Second filter; 7. Base; 8. First high-pressure proportional valve; 9. Gas storage tank; 10. Second high-pressure proportional valve; 11. Gas analyzer; 12. First gas inlet; 13. Second gas inlet; 14. Mixer outlet; 15. First mixing outlet; 16. Second mixing outlet. Detailed Implementation

[0042] Example 1

[0043] Please see Figure 1-3 This invention provides a technical solution: a gas mixing system based on high-pressure proportional valve control, comprising:

[0044] The system comprises a first gas branch, a second gas branch, an energy storage unit, and a detection and control unit.

[0045] The first gas branch has a first gas inlet 12;

[0046] The first high-pressure proportional valve 8 has its inlet connected to the first gas inlet 1.

[0047] The first check valve 2 is located downstream of the outlet of the first high-pressure proportional valve 8 and is used to block backflow.

[0048] The second gas branch has a second gas inlet 13;

[0049] The second high-pressure proportional valve 10 has its inlet connected to the second gas inlet 13;

[0050] The second check valve 5 is located downstream of the outlet of the second high-pressure proportional valve 10.

[0051] The regulating valve 4 is located downstream of the second gas branch and is used to finely adjust the instantaneous flow rate of the second gas branch.

[0052] The energy storage unit includes a gas storage cylinder 9, which is used to temporarily store the output mixed high-pressure gas.

[0053] The detection and control unit includes a gas analyzer 11, whose sampling end is connected to the gas storage tank 9, for real-time detection of the concentration of the target component in the mixed high-pressure gas;

[0054] Control panel 1 includes a controller, which is electrically connected to the gas analyzer 11 and adjusts the opening of the first high-pressure proportional valve 8 and the second high-pressure proportional valve 10 in a closed loop according to the detection signal of the gas analyzer 11 so that the concentration of the target component is maintained within a preset range.

[0055] Mixer outlet 14 is connected to the discharge end of the gas analyzer 11 and is used to output the proportioned high-pressure mixed gas.

[0056] For the first time, a high-pressure proportional valve, traditionally used in hydraulics, pneumatics, and industrial automation, is introduced into a high-pressure gas mixing scenario. Utilizing its closed-loop drive characteristics, it directly controls the proportional distribution of oxygen and nitrogen. The valve core displacement and channel opening of the high-pressure proportional valve are linearly related, allowing for real-time correction by a PID algorithm, thus achieving low steady-state error near the concentration setpoint. Simultaneously, its sub-millisecond drive response compensates for disturbances caused by pressure pulsations within the gas reservoir, making the purity fluctuations of the mixed gas controllable. Compared to common solutions, this system eliminates the need for a two-stage pressure reducing device and a multi-branch mass flow controller, reducing energy consumption and device size. It also achieves purity locking on the high-pressure side in a single operation, making it suitable for operating conditions with extremely stringent requirements for both high pressure and stability.

[0057] Specifically, the first gas branch, the second gas branch, the energy storage unit, and the detection and control unit are all housed inside the chassis, and the bottom of the chassis is provided with a base 7.

[0058] By compactly integrating two gas branches and the entire closed-loop detection and control link into a chassis and providing support with a base, an integrated mobile workstation can be formed. This structure shortens the piping and reduces potential leakage points. The base optimizes the distribution of the internal center of gravity, and the rigid frame can absorb external vibration and shock.

[0059] Specifically, the first gas branch also has a first filter 3, which is located downstream of the first one-way valve 2.

[0060] The first filter is located downstream of the first one-way valve, allowing oxygen to undergo particle filtration before entering the three-way connector, effectively blocking particles such as rust and oil mist from inside the oxygen cylinder.

[0061] Specifically, the second gas branch also has a second filter 6, which is located downstream of the second check valve 5.

[0062] The second filter acts on the nitrogen branch, ensuring that the oxygen / nitrogen dual-path filtration specifications are at the same level, thus eliminating the impact of differences in gas source cleanliness on the control accuracy of the proportional valve.

[0063] Specifically, it also includes a mixing unit, which includes a three-way connector. The three-way connector has at least two inlets that are connected to the first filter 3 and the regulating valve 4, respectively, and the outlet of the three-way connector is connected to the air storage tank 9.

[0064] The tee connector enables instantaneous turbulent mixing of two clean, high-pressure gases within a millimeter-level cavity, followed by pressure equalization via a gas storage tank, thus shortening the mixing completion time. The rapid response of the high-pressure proportional valve ensures immediate adjustment of the two branch flow rates even with minor deviations in gas concentration, allowing the mixing ratio output from the tee connector to recover to the target value within milliseconds. This effectively avoids step-like fluctuations, improves the overall system frequency response, and enables closed-loop bandwidth through a controller, meeting the stringent requirements for high-frequency concentration stability, such as in pressure cycling testing machines.

[0065] Specifically, the first gas inlet 12 is an oxygen inlet, and the second gas inlet 13 is a nitrogen inlet.

[0066] Specifically, the gas analyzer 11 is a nitrogen analyzer.

[0067] Specifically, the controller receives a concentration signal from the gas analyzer 12 and simultaneously adjusts the opening of the first high-pressure proportional valve 8 and the second high-pressure proportional valve 10 to maintain a preset target concentration of nitrogen.

[0068] The controller uses the nitrogen analyzer output as the sole feedback variable and employs a dual-valve linkage strategy, enabling the first and second high-pressure proportional valves to adjust synchronously based on the same error signal. Thanks to the high opening-flow linearity and fast dynamic response of the high-pressure proportional valves, the system can complete step concentration settings and achieve steady-state convergence without significant oscillations or overshoot. Compared to traditional single-valve or position-based MFC calibration methods, this fully leverages the combined advantages of high precision, rapid response, and high-pressure adaptability of the high-pressure proportional valves.

[0069] The entire device is installed in a pressure-resistant chassis, which is welded from 304 stainless steel plate, with a detachable vibration-damping base welded to the bottom. The first gas inlet is connected to the nitrogen manifold via an M24×1.5 high-pressure connector; the second gas inlet is connected to the industrial pure oxygen manifold via a similar connector. The nitrogen branch is connected in series with the first high-pressure proportional valve, the first check valve, and the first filter; the oxygen branch is connected in series with the second high-pressure proportional valve, the second check valve, the second filter, and the regulating valve. The downstream of the two filters merges through a tee connector and enters the gas storage tank. The outlet of the gas storage tank is connected to the sampling port of the gas analyzer and finally output to the welding torch from the mixer outlet. All pipe sections are made of Φ6 mm×1 mm 316L seamless stainless steel pipe, sealed with tapered thread ferrule fittings. The first and second high-pressure proportional valves are electro-hydraulic servo proportional valves with a rated pressure of 35 MPa and a maximum Cv of 0.04; the valve core stroke of 0-1 mm corresponds to a PWM drive duty cycle of 5-95%, and the linearity is calibrated to R²≥0.985. The one-way valve has an opening pressure of 0.05 MPa, and the filter element has a filter accuracy of 3 µm and is removable and replaceable.

[0070] The control panel integrates a 32-bit STM32 series MCU, a 16-bit Δ-Σ A / D acquisition module, and a 20kHz PWM output module. The gas analyzer uses a laser paramagnetic-zirconia integrated sensor, with a detection range of 0-1 vol %O2, a resolution of 10 ppm, and a response time of 200 ms. The MCU reads the analyzer concentration C(t) and the target setpoint C every 10 ms. s The calculation error e(t) = C s -C(t), the control quantity u(t) is obtained through a proportional-integral-derivative (PID) circuit. The PID parameters are empirically tuned to P=1.8, I=0.7 s⁻¹, D=0.02 s; the control quantity is first processed by the static opening conversion function f. n (u), f o (u) The target opening θ of the first and second high-pressure proportional valves is allocated. n θ o (satisfies θ) n +θ o =θ max (constraints), plus additional inlet valve pressure Pn P o The adaptive compensation Δθp, where Δθp = k·(P_ref - P n,o k is set to 0.003% / bar, obtained through offline calibration of the valve pressure-flow relationship. The final opening command drives the proportional valve coil using a PWM signal. Simultaneously, the MCU samples the gas reservoir pressure P at 50 Hz. s and valve back pressure P n P o , such as P s >22 MPa or P s <10 MPa triggers an audible and visual alarm and shuts off the gas supply solenoid valve.

[0071] Before starting the system, follow these steps in sequence:

[0072] S1. Open the exhaust valve and purge with low pressure for 30 seconds to remove air;

[0073] S2. Open the nitrogen and oxygen manifold valves in sequence and observe that the inlet pressure gauge is stable at 18-22 MPa.

[0074] S3. The control panel executes a "self-test" procedure to calibrate the analyzer's zero point and span;

[0075] S4, MCU: Set both proportional valves to 10% opening, and slowly increase the pressure to the working pressure;

[0076] S5. When the pressure in the gas storage tank is stable and the analyzer displays O2 < 0.02%, it enters closed-loop operation.

[0077] During operation, you can select a "process template" via the touchscreen.

[0078] Example template: Arc initiation phase C s =0.5%O2, heat preservation for 2 seconds; filling stage C s =0.1%O2, hold for 8 seconds; C during arc termination phase s =0.3% O2, hold for 1 second, repeat cycle. The MCU controls C during stage switching. s For step adjustments, a concentration deviation |e(t)| < 0.002% within 1 second in the closed-loop system satisfies the steady-state criterion. If |e(t)| > 0.05% is detected for 3 consecutive seconds or the analyzer loses a signal, the MCU will simultaneously close both proportional valves to 5% opening and display an alarm message according to the set fault logic. During system online debugging, the regulating valve 4 is mechanically locked after being turned to the target flow resistance by the engineer. This is used to fine-tune the instantaneous peak flow rate of the oxygen branch, preventing mixing ratio shocks caused by large changes in the proportional valve opening.

[0079] This embodiment is only used to illustrate the technical solution of the present invention. Depending on the different welding power, gas ratio or pressure level, a high-pressure proportional valve with a larger flow rate or higher pressure resistance, an analyzer with a higher range and corresponding software parameters can be selected and adjusted, all of which fall within the protection scope of the present invention.

[0080] Example 2

[0081] A dual-outlet gas mixing system based on high-pressure proportional valve control, comprising:

[0082] Oxygen inlet;

[0083] Hydrogen inlet;

[0084] An oxygen high-pressure proportional valve, the inlet of which is connected to the oxygen inlet;

[0085] A high-pressure proportional valve for hydrogen, the inlet of which is connected to the hydrogen inlet;

[0086] The first check valve is located downstream of the outlet of the oxygen high-pressure proportional valve;

[0087] The second check valve is located downstream of the outlet of the hydrogen high-pressure proportional valve.

[0088] A mixing manifold, wherein at least two inlets are respectively connected to the outlet of the first check valve and the outlet of the second check valve;

[0089] The first mixed-use branch includes:

[0090] The first branch regulating valve is connected to the mixing manifold and is used to finely adjust the instantaneous flow rate or ratio of the first mixing branch.

[0091] The first gas analyzer has its sampling end located downstream of the first branch regulating valve, and is used to detect the concentration of the target component in the mixed gas of the first mixing branch in real time.

[0092] First mixed batch export 15;

[0093] The second mixing branch has a structure corresponding to the first mixing branch, including a second branch regulating valve, a second gas analyzer, and a second mixing outlet 16.

[0094] The control panel has a built-in controller, which is electrically connected to both the first gas analyzer and the second gas analyzer.

[0095] The controller adjusts the opening of the oxygen high-pressure proportional valve, the hydrogen high-pressure proportional valve and the first branch regulating valve in a closed loop according to the detection signal of the first gas analyzer, so that the mixed gas output from the first mixing branch reaches the first preset concentration range.

[0096] The controller adjusts the opening of the oxygen high-pressure proportional valve, the hydrogen high-pressure proportional valve, and the second branch regulating valve in a closed loop based on the detection signal of the second gas analyzer, so that the mixed gas output from the second mixing branch reaches the second preset concentration range.

[0097] The first mixing branch and the second mixing branch are each equipped with an independent gas storage tank to buffer pressure fluctuations in their respective branches.

[0098] The first branch regulating valve and the second branch regulating valve are electric servo needle valves.

[0099] In the dual-outlet gas mixing system, both the oxygen high-pressure proportional valve and the hydrogen high-pressure proportional valve are proportional valves with a rated pressure resistance of not less than 30 MPa, and each is equipped with a position feedback sensor.

[0100] The dual-outlet gas mixing system is characterized in that a first filter is further provided downstream of the first one-way valve, and a second filter is further provided downstream of the second one-way valve, for removing particulate impurities.

[0101] The dual-outlet gas mixing system is provided with a controller having a first PID control channel and a second PID control channel, corresponding to the first mixing branch and the second mixing branch, respectively.

[0102] The dual-outlet gas mixing system described above uses a symmetrical flow channel structure in the mixing manifold to ensure that the two mixing branches obtain the same total pressure at the inlet.

[0103] The dual-outlet gas mixing system, wherein the oxygen inlet, the hydrogen inlet, the mixing manifold and the two mixing branches are all integrated and installed in the same chassis, and the chassis is provided with a base at the bottom.

Claims

1. A gas mixing system based on high-pressure proportional valve control, characterized in that, include: At least two gas branches, each gas branch having a gas inlet and a high-pressure proportional valve connected to that gas inlet; A check valve is installed downstream of the high-pressure proportional valve outlet in each gas branch; At least one mixing unit for mixing gases from the at least two gas branches under high pressure; At least one energy storage unit is connected to the outlet of the mixing unit for temporarily storing the output mixed high-pressure gas; At least one detection and control unit, including a gas analyzer, whose sampling end is connected to the energy storage unit, is used to detect the concentration of the target component in the mixed high-pressure gas in real time; The controller is electrically connected to the gas analyzer and adjusts the opening of the high-pressure proportional valve in a closed loop according to the detection signal of the gas analyzer, so as to maintain the concentration of the target component of the mixed high-pressure gas within a preset range. At least one mixing outlet is connected to the discharge end of the gas analyzer for outputting a pre-mixed high-pressure gas mixture.

2. The gas mixing system based on high-pressure proportional valve control according to claim 1, characterized in that, The gas branch, the energy storage unit, and the detection and control unit are all housed inside the chassis, and the bottom of the chassis is provided with a base.

3. A gas mixing system based on high-pressure proportional valve control according to claim 2, characterized in that, The gas branch is equipped with a filter downstream of the one-way valve.

4. A gas mixing system based on high-pressure proportional valve control according to claim 3, characterized in that, The mixing unit includes a mixing connector with at least two inlets, each inlet being connected to a gas branch equipped with a filter or regulating valve, and the outlet of the mixing connector being connected to an energy storage unit.

5. A gas mixing system based on high-pressure proportional valve control according to claim 4, characterized in that, At least one of the gas inlets is a first gas inlet, and the other gas inlet is a second gas inlet. The first gas and the second gas are different types of gases.

6. A gas mixing system based on high-pressure proportional valve control according to claim 1, characterized in that, The controller receives the concentration signal from the gas analyzer and simultaneously adjusts the opening of each high-pressure proportional valve to maintain the preset concentration of the target component.

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