Mechanical mixed gas proportioning cabinet

Abstract

The invention discloses a mechanical mixed gas proportioning cabinet, and belongs to the technical field of gas proportioning cabinets. Comprising a cabinet body, a pressure balancing unit, a proportioning regulating valve, a CO2 gas supply pipe group, an Ar gas supply pipe group and a mixed gas output pipeline, wherein a CO2 gas inlet interface, an Ar gas inlet interface and a mixed gas output interface are fixed on a side plate of the cabinet body; the pressure balance unit is installed on the inner side of the cabinet body and comprises a first pressure balance valve, the output end of the first pressure balance valve is connected to the input end of a second pressure balance valve and the pneumatic control end of a fourth pressure balance valve, and the input end of the fourth pressure balance valve is connected with the output end of a third pressure balance valve. The mechanical mixed gas proportioning cabinet disclosed by the invention can eliminate pressure fluctuation of input gas and pressure fluctuation caused by proportioning adjustment of an output side; the interior of the cabinet body is of a pure mechanical structure, the matching precision is high, visual observation can be achieved, the mixed gas proportion is continuously adjustable, and the requirement for the binary gas mixing matching can be met.

Description

Technical Field

[0001] This invention specifically relates to a mechanical gas mixing cabinet, belonging to the technical field of gas mixing cabinets. Background Technology

[0002] The use of mixed gases in industrial production is increasing, as they can meet various process requirements, particularly in welding, chemical engineering, materials science, electronics, casting, and scientific experiments. For example, Chinese Patent Publication No. CN221570255U discloses an argon-carbon dioxide mixing cabinet that integrates the entire mixing equipment into a mixing chamber. Another example is Chinese Patent Publication No. CN114768566A, which discloses an automatic mixing cabinet for mixed gases, including multiple gas mixing channels and a mixing mechanism. This mechanism, through flow detection and control devices, can more intuitively, quickly, and accurately adjust the mixing ratio of the gases. Furthermore, when malfunctions or changes occur, users can quickly identify and resolve them themselves, preventing downtime and production losses during maintenance. However, existing mixing cabinets typically handle large-flow gas mixing... The current system suffers from poor accuracy and a large flow rate, failing to meet the requirements of low flow rate and high accuracy. Furthermore, fluctuations in the input gas pressure, or adjustments to the gas ratio in the mixing cabinet, cause gas pressure fluctuations on the output side, directly affecting the mixing accuracy. Errors in gas accuracy directly impact the processing and production end. For example, when the mixed gas is used as a shielding gas for welding, changes in its ratio directly affect welding quality, arc characteristics, and weld performance. Moreover, when switching welding objects, such as switching from welding thick plates with low requirements for weld appearance to low-carbon steel short-circuit transition welding, high-speed MAG welding, and deep penetration welding, fluctuations caused by the gas ratio change, and the presence of the previous mixed gas ratio in the pipeline after the switch, directly affect the welding quality of the current welding object. In addition, the current mixing cabinet's inlet and outlet are not on the same side, but are generally distributed on the left and right sides, which imposes requirements on the on-site pipeline routing. Moreover, the mixing cabinet's internal space is small, leaving no room for maintenance. Summary of the Invention

[0003] To address the aforementioned issues, this invention proposes a mechanical gas mixing cabinet that can eliminate pressure fluctuations in the input gas and pressure fluctuations caused by adjustments to the output mixing ratio. The cabinet features a purely mechanical internal structure, ensuring high mixing accuracy and allowing for direct observation. The mixed gas ratio is continuously adjustable, meeting the requirements for binary gas mixing ratios.

[0004] The mechanical gas mixing and proportioning cabinet of the present invention includes: The cabinet has a CO2 air inlet, an Ar air inlet, and a mixed gas output interface fixed on its side panel. A pressure balancing unit is installed inside the cabinet. The pressure balancing unit includes a first pressure balancing valve, the output of which is connected to the input of a second pressure balancing valve and the pneumatic control terminal of a fourth pressure balancing valve. The input of the fourth pressure balancing valve is connected to the output of a third pressure balancing valve, and the output of the third pressure balancing valve is also connected to the pneumatic control terminal of the second pressure balancing valve. The pneumatic control terminals of the first and third pressure balancing valves are connected and connected to a reference pressure regulating valve via a control pressure gauge. The input of the reference pressure regulating valve is connected to an Ar inlet port. The input of the first pressure balancing valve is connected to a CO2 inlet port via a CO2 pressure gauge, and the input of the third pressure balancing valve is connected to an Ar inlet port via an Ar pressure gauge. A proportioning regulating valve is fixed inside the cabinet, and the regulating button of the proportioning regulating valve is embedded in the front panel of the cabinet; the output ends of the second pressure balancing valve and the fourth pressure balancing valve are respectively connected to the two air inlets of the proportioning regulating valve; the output end of the proportioning regulating valve is connected to the mixed gas output interface through a mixed gas pressure gauge. The CO2 supply pipeline assembly includes a CO2 pipeline, with both ends of the CO2 pipeline connected to a CO2 gas source and a CO2 inlet port, respectively. A CO2 switch valve, a CO2 pressure regulating valve, and a CO2 filter are connected in series on the CO2 pipeline. Ar gas supply pipeline assembly, the Ar gas supply pipeline assembly includes an Ar pipeline, the two ends of the Ar pipeline are respectively connected to an Ar gas source and an Ar gas inlet, and an Ar switch valve, an Ar pressure regulating valve and an Ar filter are connected in series on the Ar pipeline; A mixed gas output pipeline, the two ends of which are connected to a mixed gas output interface and a gas consumption terminal; a mixed gas switch valve is connected in series on the mixed gas output pipeline.

[0005] First, two different gases (CO2 and Ar) are regulated by CO2 and Ar pressure regulating valves to prevent large-flow gas from entering the cabinet and impacting internal components or causing excessive fluctuations. This ensures that the two gases are relatively stable and their flow rates are limited before entering the cabinet. When the input pressure of the two gases varies within a certain range, the pressure is balanced by the pressure balancing unit, which does not affect the mixing accuracy. After achieving pressure equilibrium through the pressure balancing unit, the two gases are fully mixed according to the required ratio through the mixing valve. The mixed gas is then output after passing through the pressure regulating valve. When the pressure balancing unit is working, the pneumatic control ends of the first and third pressure balancing valves are provided with reference pressure through the reference pressure regulating valve. This ensures that the output sides of the first and third pressure balancing valves receive a precise reference pressure, which controls the second and fourth pressure balancing valves. Simultaneously, the first and fourth balancing valves continuously perform pressure stabilization control. If the output ratio is adjusted, it will... The pressure balance unit affects the output pressures of the second and fourth pressure balancing valves. For example, when the CO2 ratio is reduced and the Ar ratio is increased, since the reference pressures on the output sides of the first and third pressure balancing valves remain unchanged, the resistance on the output side of the second pressure balancing valve increases, while the resistance on the output side of the fourth pressure balancing valve decreases. At this time, the resistance on the input side of the second pressure balancing valve increases simultaneously. The input side of the second pressure balancing valve interferes with the pneumatic control end of the fourth pressure balancing valve, increasing the pneumatic pressure at the fourth pressure balancing valve's control end, thereby controlling the opening of the fourth pressure balancing valve to increase. Since the reference pressure remains unchanged, the input side of the fourth pressure balancing valve interferes with the pneumatic control end of the third pressure balancing valve, decreasing the pneumatic pressure at the second pressure balancing valve's control end, thereby controlling the opening of the third pressure balancing valve to decrease. The pressure balancing unit dynamically controls the two gases to achieve pressure balance. When the input pressure fluctuates, the CO2 pressure regulating valve, the Ar pressure regulating valve, and the four sets of pressure balancing valves are used for balancing control, allowing the input pressures of the two gases to vary within a certain range without affecting the mixing accuracy.

[0006] Furthermore, a sampling tube valve is connected in parallel between the proportioning regulating valve and the mixed gas output interface. By sampling the mixed gas output by the proportioning regulating valve through the sampling tube valve, it is possible to obtain online whether the mixed gas has reached the proportioning accuracy.

[0007] Furthermore, a gas mixing safety unit is connected in series between the gas mixing output interface and the gas mixing output pipeline. The gas mixing safety unit includes a cylindrical vortex mixing chamber. A spiral guide vane is fixed to the input side of the vortex mixing chamber, and a guide column is fixed to the center of the vortex mixing chamber. A flange is fixed to the output side of the vortex mixing chamber, and a micro-orifice plate is fixed inside the flange. A CO2 transmitter and an Ar transmitter are fixed inside the flange on the output side of the micro-orifice plate. The CO2 transmitter and Ar transmitter are installed inside the flange and positioned on the output side of the micro-orifice plate, enabling monitoring of the slowly flowing gas mixture and ensuring monitoring accuracy. The flange is connected to the gas mixing output pipeline via a flange. The CO2 and Ar transmitters are connected to an alarm via a controller. When the CO2 and Ar transmitters detect an imbalance in the gas-mixture ratio, the controller sends a signal to the alarm, which then issues an alarm to prevent operation under imbalanced gas-mixture conditions. A circular grating ruler is fixed to the adjustment button of the proportioning valve, and this grating ruler is connected to the controller. The flange is connected to the gas-mixture output pipeline via a three-way valve. The middle end of the three-way valve is connected to the venting unit. The circular grating ruler monitors the rotation angle of the rotary button in real time, and the zero point is pre-calibrated before monitoring. The rotation step of the rotary button is correlated with the unit proportion adjustment of the proportioning valve, thereby allowing the controller to obtain the information. The current CO2 and Ar ratio can be determined by measuring the rotation angle. The mixed gas output interface delivers the pre-mixed gas, which enters the vortex mixing chamber. The cylindrical structure of the vortex mixing chamber facilitates the formation of a stable vortex within the chamber, reducing dead zones and ensuring thorough mixing. The chamber is made of high-strength metal materials, such as stainless steel, to ensure it can withstand certain pressures and provides excellent sealing to prevent gas leakage. Spiral guide vanes are installed within the vortex mixing chamber. When the mixed gas enters the chamber, it first encounters these vanes, and guided by them, it begins a spiral motion, forming an initial vortex. A vortex is then positioned in the center of the vortex mixing chamber. A central guide column, with a smooth surface and a cylindrical or conical shape, further alters the gas flow path and enhances the turbulence of the vortex. As the gas rotates around the central guide column, intense collisions and mixing occur between different gases, resulting in more thorough mixing. Simultaneously, the central guide column stabilizes the airflow, preventing turbulence within the cavity. A microporous plate is installed on the output side of the vortex mixing chamber. This microporous plate is made of corrosion-resistant, high-strength materials such as polytetrafluoroethylene (PTFE) or special ceramics. These materials possess excellent chemical stability, preventing chemical reactions with the mixed gas and ensuring that the microporous mixing plate will not deform or be damaged during long-term use.The micropores of the microporous plate are uniformly distributed across the entire plate surface. The diameter and distribution density of the micropores are set according to the properties of the mixed gas and the mixing requirements, causing strong turbulence and diffusion as the gas passes through the micropores, further improving the mixing uniformity. The high distribution density of the micropores ensures that the gas can pass through the mixing plate uniformly, avoiding localized uneven mixing. The gas first forms a strong vortex in the vortex mixing chamber through the action of the spiral guide vanes and the central guide column. The two gases collide and mix in the vortex, achieving initial uniform mixing. Then, the mixed gas reaches the outlet of the vortex mixing chamber and passes through the microporous plate. As it passes through the micropores, the gas is confined and segmented, generating even stronger turbulence and diffusion, making the mixing even more uniform.

[0008] Furthermore, the venting unit is an electrically controlled venting valve connected to the controller; when the proportioning regulating valve is adjusted, the generated fluctuating mixed gas and the mixed gas in the mixed gas output pipeline are discharged through the three-way valve.

[0009] Furthermore, an electrically controlled shut-off valve is connected in series with the sampling tube valve at the mixed gas output interface; the sampling tube valve is connected to the return gas tank through a sampling control valve, and the venting unit is a buffer tank; the buffer tank is connected to the return gas tank through an air pump; the return gas tank is connected to the input terminals of the CO2 switch valve and the Ar switch valve through two sets of bypass valves respectively; During each ratio adjustment, the buffer tank receives fluctuating mixed gas. An air pump evacuates the buffer tank to ensure it is in a vacuum state before the next ratio adjustment, allowing it to receive fluctuating mixed gas during ratio switching. The air pump repeatedly pumps this fluctuating mixed gas into the return gas tank. Once the required number of evacuations is reached, and during idle periods of gas supply, the gas reuse mixing process can begin. Specifically, the controller uses a circular grating ruler (or rotary encoder) to obtain the rotation angle of the adjustment button on the ratio control valve, thus determining the required ratio. The controller controls the opening of the corresponding bypass valve according to the two mixing ratio requirements (CO2 or Ar increases compared to the previous cycle), intermittently injecting CO2 or Ar, and forming a closed loop through the gas pump, buffer tank, reuse tank and mixing safety unit. The reuse modulation stops when the CO2 transmitter and Ar transmitter of the mixing safety unit detect that the mixed gas meets the standard. In the next gas supply, the gas supply from the reuse tank is prioritized. When the gas pressure in the reuse tank is lower than the set value, the electrically controlled shut-off valve opens and the sampling control valve closes, switching to the cabinet for mixed gas supply.

[0010] Furthermore, an electrically controlled valve is installed at the output end of the mixed gas output pipeline at the output end of the mixed gas switching valve; a pressure transmitter is installed at the output end of the electrically controlled valve on the mixed gas output pipeline; the pressure transmitter is connected to the controller; when the switch of the gas terminal is closed, the pressure transmitter detects pressure fluctuations and triggers the gas recycling mixing process. At this time, the electrically controlled valve is closed, and the electrically controlled valve and the gas terminal form a closed loop at one end. The mixed gas in the mixed gas output pipeline upstream of the electrically controlled valve is recovered and modulated; when the switch of the gas terminal is opened, the gas pressure in the closed loop is released. After the pressure transmitter detects the change in gas pressure, the controller controls the gas recycling mixing process to stop immediately and controls the electrically controlled shut-off valve to open. Then, the electrically controlled valve opens, and the mixed gas is supplied to the gas terminal through the electrically controlled valve.

[0011] Furthermore, the CO2 gas source and Ar gas source are either a pressure pipeline network supplying CO2 or Ar gas, or a gas tank storing CO2 or Ar pressurized gas; the pressure gas source is provided through the pressure pipeline network and gas tank, and after subsequent pressure adjustment, the gas source pressure entering the cabinet meets the requirements for the mixed gas ratio.

[0012] Furthermore, the CO2 inlet, Ar inlet, and mixed gas outlet are all fixed on the same side of the cabinet, and the inlet and outlet of the mixing cabinet are on the same side. By changing the position of the inlet and outlet of the existing cabinet, the inlet and outlet are both on one side, changing the traditional layout of opposite sides of the inlet and outlet, and is no longer constrained by the position of the on-site pipeline.

[0013] Furthermore, the control pressure gauge, CO2 pressure gauge, Ar pressure gauge, and mixed gas pressure gauge are fitted and fixed to the front panel of the cabinet; by integrating the control pressure gauge, CO2 pressure gauge, Ar pressure gauge, and mixed gas pressure gauge on the front panel of the cabinet, the CO2 intake pressure, Ar intake pressure, reference pressure controlled by the pressure balance unit, and mixed gas output pressure of the cabinet can be directly observed.

[0014] Compared with the prior art, the mechanical gas mixing and proportioning cabinet of the present invention has the following advantages: 1. The pressure balancing unit can eliminate fluctuations in CO2 and Ar supply on the input side, ensuring stable pressure and flow rate of CO2 and Ar before entering the proportioning valve; and when the proportioning valve is adjusted, the pressure balancing unit can eliminate output pressure fluctuations, ensuring the accuracy of the mixed gas proportion; the proportioning valve can achieve continuous adjustment of the mixed gas ratio, meeting the requirements of binary gas mixing proportion.

[0015] 2. The cabinet has a purely mechanical internal structure, and with the help of a mechanical pressure gauge, it can be directly observed, which can greatly reduce the failure rate of the mixing cabinet. The mixing cabinet can complete gas mixing for a long time and provide the working end with high-precision mixed gas.

[0016] 3. It can perform secondary mixing of the intake air and monitor the mixed gas in real time during mixing to avoid abrupt changes in the mixed gas.

[0017] 4. The cabinet externally bypasses the mixed gas left in the mixed gas output pipeline before mixing, as well as the mixed gas generated during the mixing process, to recover the mixed gas. The high-precision gas that has been mixed is then sent to the output side of the mixed gas output pipeline, avoiding gas waste caused by external discharge. At the same time, the corresponding high-precision mixed gas can be quickly obtained using the gas terminal, avoiding mismatch between the mixed gas and the gas required for the operation in the early stage of the operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the cabinet front of the present invention.

[0019] Figure 2 This is a schematic diagram of the overall internal structure of the cabinet according to the present invention.

[0020] Figure 3 This is a schematic diagram of the overall structure of Embodiment 1 of the mechanical gas mixing and proportioning cabinet of the present invention.

[0021] Figure 4 This is a schematic diagram of the overall structure of Embodiment 2 of the mechanical gas mixing cabinet of the present invention.

[0022] Figure 5 This is a schematic diagram of the overall structure of Embodiment 3 of the mechanical gas mixing and proportioning cabinet of the present invention.

[0023] Figure 6 This is a schematic diagram of the overall structure of Embodiment 4 of the mechanical gas mixing and proportioning cabinet of the present invention.

[0024] Attached reference numerals: 1. Cabinet; 2. CO2 inlet port; 3. Ar inlet port; 4. Mixed gas outlet port; 5. First pressure balancing valve; 6. Second pressure balancing valve; 7. Fourth pressure balancing valve; 8. Third pressure balancing valve; 9. Control pressure gauge; 10. Reference pressure regulating valve; 11. CO2 pressure gauge; 12. Ar pressure gauge; 13. Proportioning valve; 14. Adjustment button; 15. Mixed gas pressure gauge; 16. CO2 pipeline; 17. CO2 on / off valve; 18. CO2 pressure regulating valve; 19. CO2 filter; 20. Ar pipeline; 21. A 21. Ar pressure regulating valve, 22. Ar filter, 23. Mixed gas output line, 24. Mixed gas switching valve, 25. Sampling pipe valve, 26. Vortex mixing chamber, 27. Spiral guide vane, 28. Guide column, 39. Flange cover, 30. Micro-orifice plate, 31. CO2 transmitter, 32. Ar transmitter, 33. Electrically controlled vent valve, 34. Electrically controlled shut-off valve, 35. Sampling control valve, 36. Return gas tank, 37. Gas charging pump, 38. Buffer tank, 49. Bypass valve, 40. Electrically controlled valve, 41. Pressure transmitter, 42. Pressure balancing unit. Detailed Implementation

[0025] Example 1: like Figures 1 to 3 The mechanical gas mixing cabinet shown includes: Cabinet 1, with a CO2 inlet port 2, an Ar inlet port 3 and a mixed gas outlet port 4 fixed on the side panel of cabinet 1; the CO2 inlet port 2, Ar inlet port 3 and mixed gas outlet port 4 are all fixed on the same side of cabinet 1, and the air inlet and outlet of the mixing cabinet are on the same side. By changing the air inlet and exhaust positions of the existing cabinet 1, the air inlet and exhaust are both on one side, changing the traditional layout of air inlet and exhaust opposite sides, and is no longer constrained by the position of on-site pipelines. A pressure balancing unit 43 is installed inside the cabinet 1. The pressure balancing unit 43 includes a first pressure balancing valve 5, the output of which is connected to the input of a second pressure balancing valve 6 and the pneumatic control terminal of a fourth pressure balancing valve 7. The input of the fourth pressure balancing valve 7 is connected to the output of a third pressure balancing valve 8, and the output of the third pressure balancing valve 8 is also connected to the pneumatic control terminal of the second pressure balancing valve 6. The pneumatic control terminals of the first and third pressure balancing valves are connected and connected to a reference pressure regulating valve 10 via a control pressure gauge 9. The input of the reference pressure regulating valve 10 is connected to an Ar inlet port 3. The input of the first pressure balancing valve 5 is connected to a CO2 inlet port 2 via a CO2 pressure gauge 11, and the input of the third pressure balancing valve 8 is connected to an Ar inlet port 3 via an Ar pressure gauge 12. A proportioning regulating valve 13 is fixed inside the cabinet 1, and the regulating button 14 of the proportioning regulating valve 13 is embedded in the front panel of the cabinet 1; the output end of the second pressure balancing valve 6 and the output end of the fourth pressure balancing valve 7 are respectively connected to the two air inlets of the proportioning regulating valve 13; the output end of the proportioning regulating valve 13 is connected to the mixed gas output interface 4 through the mixed gas pressure gauge 15. The CO2 supply pipeline assembly includes a CO2 pipeline 16, with both ends of the CO2 pipeline 16 connected to a CO2 gas source and a CO2 inlet port 2, respectively. A CO2 switch valve 17, a CO2 pressure regulating valve 18, and a CO2 filter 19 are connected in series on the CO2 pipeline 16. Ar gas supply pipeline assembly, the Ar gas supply pipeline assembly includes an Ar pipeline 20, the two ends of the Ar pipeline 20 are respectively connected to an Ar gas source and an Ar gas inlet 3, and an Ar switch valve 21, an Ar pressure regulating valve 22 and an Ar filter 23 are connected in series on the Ar pipeline 20. A mixed gas output pipeline 24 is provided, with both ends of the mixed gas output pipeline 24 connected to a mixed gas output interface 4 and a gas terminal; a mixed gas switch valve 25 is connected in series on the mixed gas output pipeline 24.

[0026] The control pressure gauge 9, CO2 pressure gauge 11, Ar pressure gauge 12, and mixed gas pressure gauge 15 are fitted and fixed on the front panel of the cabinet 1. By integrating the control pressure gauge 9, CO2 pressure gauge 11, Ar pressure gauge 12, and mixed gas pressure gauge 15 on the front panel of the cabinet 1, the CO2 inlet pressure, Ar inlet pressure, the reference pressure controlled by the pressure balance unit 43, and the mixed gas output pressure of the cabinet 1 can be directly observed.

[0027] First, two different gases (CO2 and Ar) are pressure-regulated by CO2 pressure regulating valve 18 and Ar pressure regulating valve 22 to prevent large-flow gas from entering the cabinet 1 and causing excessive impact or fluctuations to the internal components. This ensures that the two gases are relatively stable and their flow rates are limited before entering the cabinet 1. When the input pressure of the two gases varies within a certain range, the pressure is balanced by pressure balancing unit 43, which does not affect the mixing accuracy. After pressure equalization is achieved by pressure balancing unit 43, the two gases are fully mixed according to the required ratio through the mixing valve. The mixed gas is then output after passing through the pressure regulating valve. When pressure balancing unit 43 is working, the pneumatic control ends of the first pressure balancing valve 5 and the third pressure balancing valve 8 are both provided with reference pressure through reference pressure regulating valve 10, so that the output sides of the first pressure balancing valve 5 and the third pressure balancing valve 8 both receive a precise reference pressure. The reference pressure controls the second pressure balancing valve 6 and the fourth pressure balancing valve 7. At the same time, the first and fourth balancing valves continuously perform pressure stabilization control. For example, when the output ratio is adjusted... This will affect the output pressure of the second pressure balancing valve 6 and the fourth pressure balancing valve 7. For example, when the CO2 ratio is reduced and the Ar ratio is increased, since the reference pressure on the output side of the first pressure balancing valve and the third pressure balancing valve 8 remains unchanged, the resistance on the output side of the second pressure balancing valve 6 increases and the resistance on the output side of the fourth pressure balancing valve 7 decreases. At this time, the resistance on the input side of the second pressure balancing valve 6 increases synchronously. The input side of the second pressure balancing valve 6 interferes with the pneumatic control end of the fourth pressure balancing valve 7, and the pneumatic control end pressure of the fourth pressure balancing valve 7 increases, thereby controlling the opening of the fourth pressure balancing valve 7 to increase. Since the reference pressure remains unchanged, the input side of the fourth pressure balancing valve 7 interferes with the pneumatic control end of the third pressure balancing valve 8, and the pneumatic control end pressure of the second pressure balancing valve 6 decreases, thereby controlling the opening of the third pressure balancing valve 8 to decrease. The pressure balancing unit 43 dynamically controls the two gases to achieve pressure balance. When the input pressure fluctuates, the CO2 pressure regulating valve 18, the Ar pressure regulating valve 22 and the four sets of pressure balancing valves are used for balancing control, which can make the input pressure of the two gases change within a certain range without affecting the proportioning accuracy.

[0028] A sampling tube valve 26 is connected in parallel between the proportioning regulating valve 13 and the mixed gas output interface 4. The mixed gas output by the proportioning regulating valve 13 is collected through the sampling tube valve 26, and it is possible to obtain online whether the mixed gas has reached the proportioning accuracy.

[0029] Example 2: like Figure 4The mechanical gas mixing cabinet shown has a gas mixing safety unit connected in series between the gas mixing output port 4 and the gas mixing output pipeline 24. The gas mixing safety unit includes a cylindrical vortex mixing chamber 27. A spiral guide vane 28 is fixed on the input side of the vortex mixing chamber 27, and a guide column 29 is fixed at the center of the vortex mixing chamber 27. A flange cover 30 is fixed on the output side of the vortex mixing chamber 27. A micro-orifice plate 31 is fixed on the inside of the flange cover 30. A CO2 transmitter 32 and an Ar transmitter 33 are fixed on the output side of the micro-orifice plate 31 inside the flange cover 30. The CO2 transmitter 32 and the Ar transmitter 33 are installed inside the flange cover 30. The flange 30 is located on the output side of the microporous plate 31, enabling monitoring of the slow-flowing mixed gas and ensuring monitoring accuracy. The flange 30 is connected to the mixed gas output pipeline 24 via a flange. The CO2 transmitter 32 and Ar transmitter 33 are connected to an alarm via a controller. When the CO2 transmitter 32 and Ar transmitter 33 detect an imbalance in the mixed gas ratio, the controller sends a signal to the alarm, which then issues an alarm to prevent operation under imbalanced mixed gas ratio conditions. A circular grating ruler is fixed at the adjustment button 14 of the proportioning valve 13, and this circular grating ruler is connected to the controller. The flange 30 is connected to the mixed gas output pipeline 24 via a three-way valve. The three-way valve is connected to the venting unit at its middle end; a circular grating ruler monitors the rotation angle of the rotary button in real time, and the zero point is calibrated before monitoring. The rotation step of the rotary button is correlated with the unit proportional adjustment of the proportioning valve 13, allowing the controller to determine the current CO2 and Ar ratio by acquiring the rotation angle; the mixed gas output interface 4 delivers the properly proportioned mixed gas, which enters the vortex mixing chamber 27. The vortex mixing chamber 27 has a cylindrical structure, which facilitates the formation of a stable vortex within the chamber, reduces dead zones in the airflow, and ensures thorough mixing of the gas. The chamber is made of high-strength metal materials, such as stainless steel, to ensure it can withstand certain pressures. The pressure is controlled while maintaining good sealing performance to prevent gas leakage. A spiral guide vane 28 is installed inside the vortex mixing chamber 27. When the mixed gas enters the vortex mixing chamber 27, it first encounters the spiral guide vane 28. Guided by the vane, the gas begins to spiral, forming a preliminary vortex. A central guide column 29 is set in the center of the vortex mixing chamber 27. Its surface is smooth, and its shape can be cylindrical or conical. The central guide column 29 further changes the gas flow path and enhances the turbulence of the vortex. During the rotation of the gas around the central guide column 29, different gases will collide and mix violently, making the mixing more thorough.Meanwhile, the central guide column 29 also stabilizes the airflow, preventing turbulence within the cavity. A microporous plate 31 is installed on the output side of the vortex mixing chamber 27. The microporous plate 31 is made of corrosion-resistant, high-strength materials, such as polytetrafluoroethylene (PTFE) or special ceramics. These materials possess excellent chemical stability and will not react chemically with the mixed gas, ensuring that the microporous mixing plate will not deform or be damaged during long-term use. The micropores of the microporous plate 31 are uniformly distributed across the entire plate surface. The diameter and distribution density of the micropores are set according to the properties of the mixed gas and the mixing requirements, ensuring strong airflow as the gas passes through the micropores. Intense turbulence and diffusion further enhance mixing uniformity; the high distribution density of micropores ensures that the gas can pass through the mixing plate uniformly, avoiding localized uneven mixing; the gas first forms a strong vortex within the vortex mixing chamber 27 through the action of the spiral guide vanes 28 and the central guide column 29. The two gases collide and mix in the vortex, achieving initial uniform mixing. Then, the mixed gas reaches the outlet of the vortex mixing chamber 27 and passes through the micro-perforated plate 31. When passing through the micropores, the gas is restricted and segmented by the micropores, generating even stronger turbulence and diffusion, making the mixing more uniform.

[0030] The venting unit is an electrically controlled venting valve 34 connected to the controller; when the proportioning regulating valve 13 is adjusted, the generated fluctuating mixed gas and the mixed gas in the mixed gas output pipeline 24 are discharged through the three-way valve.

[0031] Example 3: like Figure 5 The mechanical gas mixing cabinet shown has an electrically controlled shut-off valve 35 connected in series with the sampling tube valve 26 at the gas output port 4. The sampling tube valve 26 is connected to the return gas tank 37 through the sampling control valve 36. The venting unit is a buffer tank 39. The buffer tank 39 is connected to the return gas tank 37 through the air pump 38. The return gas tank 37 is connected to the input terminals of the CO2 switch valve 17 and the Ar switch valve 21 through two sets of bypass valves 40. During each ratio adjustment, the buffer tank 39 receives the fluctuating mixed gas. The air pump 38 evacuates the gas from the buffer tank 39 to ensure that the buffer tank 39 is in a vacuum state when the ratio is adjusted next time, so that it can receive the fluctuating mixed gas brought in during the ratio switching process. The air pump 38 repeatedly introduces the fluctuating mixed gas into the return gas tank 37. When the number of evacuations is reached, and during the gas supply idle period, the gas reuse mixing process can be carried out. Specifically, the controller obtains the rotation angle of the adjustment button 14 of the current ratio adjustment valve 13 through the circumferential grating ruler (or rotary encoder) to obtain the ratio requirement. The controller controls the opening of the corresponding bypass valve 40 according to the two mixing ratio requirements (CO2 or Ar increases compared to the previous cycle), intermittently injecting CO2 or Ar, and forming a closed loop through the gas pump 38, buffer tank 39, reuse tank and mixing safety unit until the CO2 transmitter 32 and Ar transmitter 33 of the mixing safety unit detect that the mixed gas meets the standard, then the reuse modulation stops, and the reuse tank is given priority to supply gas during the next gas supply. When the gas pressure in the reuse tank is lower than the set value, the electric shut-off valve 35 opens and the sampling control valve 36 closes, switching to cabinet 1 to supply mixed gas.

[0032] Example 4: like Figure 6 The mechanical gas mixing cabinet shown has an electrically controlled valve 41 installed at the output end of the gas mixing switch valve 25 on the gas mixing output line 24; a pressure transmitter 42 is installed at the output end of the electrically controlled valve 41 on the gas mixing output line 24; the pressure transmitter 42 is connected to the controller; when the gas terminal switch is closed, the pressure transmitter 42 detects pressure fluctuations and triggers the gas recycling mixing process. At this time, the electrically controlled valve 41 is closed, and the electrically controlled valve 41 and the gas terminal form a closed loop at one end. The mixed gas in the gas mixing output line 24 before the electrically controlled valve 41 is recovered and modulated; when the gas terminal switch is opened, the gas pressure in the closed loop is released. After the pressure transmitter 42 detects the gas pressure change, the controller controls the gas recycling mixing process to stop immediately and controls the electrically controlled shut-off valve 35 to open. Then, the electrically controlled valve 41 opens, and the mixed gas is supplied to the gas terminal through the electrically controlled valve 41.

[0033] The CO2 and Ar gas sources are either pressure pipelines supplying CO2 or Ar, or gas tanks storing CO2 or Ar pressurized gas. Pressure gas sources are provided through pressure pipelines and gas tanks, and after subsequent pressure adjustment, the pressure of the gas source entering cabinet 1 meets the requirements for the mixed gas ratio.

[0034] The above embodiments are merely preferred embodiments of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention are included within the scope of the present invention.

Claims

1. A mechanical gas mixing and proportioning cabinet, characterized in that: include: The cabinet has a CO2 air inlet, an Ar air inlet, and a mixed gas output interface fixed on its side panel. A pressure balancing unit is installed inside the cabinet. The pressure balancing unit includes a first pressure balancing valve, the output of which is connected to the input of a second pressure balancing valve and the pneumatic control terminal of a fourth pressure balancing valve. The input of the fourth pressure balancing valve is connected to the output of a third pressure balancing valve, and the output of the third pressure balancing valve is also connected to the pneumatic control terminal of the second pressure balancing valve. The pneumatic control terminals of the first and third pressure balancing valves are connected and connected to a reference pressure regulating valve via a control pressure gauge. The input of the reference pressure regulating valve is connected to an Ar inlet port. The input of the first pressure balancing valve is connected to a CO2 inlet port via a CO2 pressure gauge, and the input of the third pressure balancing valve is connected to an Ar inlet port via an Ar pressure gauge. A proportioning regulating valve is fixed inside the cabinet, and the regulating button of the proportioning regulating valve is embedded in the front panel of the cabinet; the output ends of the second pressure balancing valve and the fourth pressure balancing valve are respectively connected to the two air inlets of the proportioning regulating valve; the output end of the proportioning regulating valve is connected to the mixed gas output interface through a mixed gas pressure gauge. The CO2 supply pipeline assembly includes a CO2 pipeline, with both ends of the CO2 pipeline connected to a CO2 gas source and a CO2 inlet port, respectively. A CO2 switch valve, a CO2 pressure regulating valve, and a CO2 filter are connected in series on the CO2 pipeline. Ar gas supply pipeline assembly, the Ar gas supply pipeline assembly includes an Ar pipeline, the two ends of the Ar pipeline are respectively connected to an Ar gas source and an Ar gas inlet, and an Ar switch valve, an Ar pressure regulating valve and an Ar filter are connected in series on the Ar pipeline; A mixed gas output pipeline, the two ends of which are connected to a mixed gas output interface and a gas consumption terminal; a mixed gas switch valve is connected in series on the mixed gas output pipeline.

2. The mechanical gas mixing and proportioning cabinet according to claim 1, characterized in that: A sampling tube valve is connected in parallel between the proportioning regulating valve and the mixed gas output interface.

3. The mechanical gas mixing and proportioning cabinet according to claim 1, characterized in that: A gas mixing safety unit is connected in series between the gas mixing output interface and the gas mixing output pipeline. The gas mixing safety unit includes a cylindrical vortex mixing chamber. A spiral guide vane is fixed on the input side of the vortex mixing chamber, and a guide column is fixed at the center of the vortex mixing chamber. A flange is fixed on the output side of the vortex mixing chamber. A micro-orifice plate is fixed on the inside of the flange. A CO2 transmitter and an Ar transmitter are fixed on the output side of the micro-orifice plate on the inside of the flange. The flange is connected to the gas mixing output pipeline via a flange. The CO2 transmitter and the Ar transmitter are connected to an alarm via a controller. A circumferential grating ruler is fixed at the adjustment button of the proportioning valve and is connected to the controller. The flange is connected to the gas mixing output pipeline via a three-way valve. The middle end of the three-way valve is connected to the venting unit.

4. The mechanical gas mixing and proportioning cabinet according to claim 3, characterized in that: The venting unit is an electrically controlled venting valve connected to the controller.

5. The mechanical gas mixing and proportioning cabinet according to claim 3, characterized in that: The mixed gas output interface is connected in series with an electrically controlled shut-off valve in front of the sampling tube valve; the sampling tube valve is connected to the return gas tank through a sampling control valve, and the venting unit is a buffer tank; the buffer tank is connected to the return gas tank through an air pump; the return gas tank is connected to the input terminals of the CO2 switch valve and the Ar switch valve through two sets of bypass valves respectively.

6. The mechanical gas mixing and proportioning cabinet according to claim 5, characterized in that: The gas mixture output pipeline is equipped with an electrically controlled valve at the output end of the gas mixture switch valve; the gas mixture output pipeline is equipped with a pressure transmitter at the output end of the electrically controlled valve; the pressure transmitter is connected to the controller.

7. The mechanical gas mixing and proportioning cabinet according to claim 1, characterized in that: The CO2 gas source and Ar gas source are either a pressure pipeline network supplying CO2 or Ar gas, or a gas tank storing CO2 or Ar pressurized gas.

8. The mechanical gas mixing and proportioning cabinet according to claim 1, characterized in that: The CO2 intake port, Ar intake port, and mixed gas output port are all fixed on the same side of the cabinet.

9. The mechanical gas mixing and proportioning cabinet according to claim 1, characterized in that: The control pressure gauge, CO2 pressure gauge, Ar pressure gauge and mixed gas pressure gauge are fitted and fixed to the front panel of the cabinet.

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