High-precision gas mixing device and method

Abstract

The invention discloses a high-precision gas mixing device and method, and relates to the technical field of gas mixing devices.The high-precision gas mixing device comprises a mixing tank, a plurality of gas storage tanks, a stirring mechanism, a detection assembly and a controller, the stirring mechanism comprises a first mixing part and a second mixing part, the first mixing part is arranged in a second mixing cavity, and the second mixing part is arranged in a third mixing cavity; the detection assembly comprises a concentration sensor and a gas pressure sensor which are arranged on the discharge pipe. According to the gas mixing device, various gases are sequentially mixed through the first mixing part and the second mixing part, the mixing effect on the various gases is improved, and the mixing proportion of the various gases is conveniently and accurately controlled through the flow regulating valve and the concentration sensor, so that the mixing proportion of the various gases is accurately controlled; the pressure of the mixed gas is monitored in real time through the arranged gas pressure sensor, and the gas pressure adjusting valve is used for adjusting the output pressure of the mixed gas, so that the pressure of the mixed gas is stabilized in a safe range.

Description

Technical Field

[0001] The present invention relates to the technical field of gas mixing devices, and in particular to a high-precision gas mixing device and method. Background Art

[0002] In many industrial and scientific applications, it is necessary to accurately mix a variety of different gases to obtain a mixed gas with a specific composition and concentration. However, existing mixing devices use simple manual adjustment or simple proportional control, which cannot achieve precise control of the gas mixing ratio. With the continuous development of technology and the expansion of application scenarios, the market demand for high-precision gas mixing devices continues to increase. At the same time, competitive pressure is also driving the innovation and progress of related technologies, prompting R&D personnel to seek more efficient and precise mixing devices.

[0003] In view of this, the present invention is proposed to solve the above technical problems. Summary of the invention

[0004] The present invention aims to provide a high-precision gas mixing device and method to solve the technical problem that the existing mixing devices are not convenient for accurately controlling the mixing ratio of multiple gases.

[0005] The first object of the present invention is to provide a high-precision gas mixing device, comprising: A mixing tank, wherein a first mixing chamber, a second mixing chamber and a third mixing chamber are arranged in sequence from left to right in the mixing tank, and the third mixing chamber is connected to a discharge pipe; A plurality of gas storage tanks, each of which is connected to the first mixing chamber, and each gas storage tank is provided with a flow regulating valve; A stirring mechanism, the stirring mechanism comprises a first mixing part and a second mixing part, the first mixing part is arranged in the second mixing chamber, and the second mixing part is arranged in the third mixing chamber; A detection component, the detection component includes a concentration sensor and a gas pressure sensor arranged on the discharge pipe, and a gas pressure regulating valve is also arranged on the discharge pipe; The controller is respectively connected with the concentration sensor and the gas pressure sensor by electrical signals, and is used to control the start and stop of the flow regulating valve and the gas pressure regulating valve.

[0006] Furthermore, the first mixing section includes a guide funnel, the diameter of the guide funnel gradually decreases from left to right, and the maximum diameter of the guide funnel is equal to the inner diameter of the mixing tank.

[0007] Further, the first mixing section further comprises a driving shaft rotatably disposed in the second mixing chamber; The driving shaft is coaxially arranged with the mixing tank; A plurality of stirring blades are evenly arranged on the circumferential side of the driving shaft; The driving shaft is also sleeved with a movable baffle, which is fixed in the mixing tank; One end of the driving shaft away from the guide funnel is connected with a driving motor, and the driving motor is fixedly mounted on the baffle.

[0008] Furthermore, the baffle is a truncated cone structure, and the arc surface of the truncated cone structure is concave toward the side away from the diversion funnel; A plurality of diverter plates are evenly arranged on the arc surface of the truncated cone structure.

[0009] Furthermore, the second mixing part is a circulation fan, and the circulation fan is used to blow the fusion gas out in a spiral shape and stir the mixed gas in the third mixing chamber.

[0010] Further, the two ends of the mixing tank are respectively provided with a front plate and a back plate which are sealed and connected; The exhaust pipe is arranged on the back plate.

[0011] A second object of the present invention is to provide a high-precision gas mixing method, which is applied to any of the above-mentioned high-precision gas mixing devices, comprising the following steps: S1. Gas preparation: according to the type and proportion of the required mixed gas, the required gas tank is opened through the controller; S2, gas input, setting the flow parameters of the gas storage tank through the flow regulating valve so that multiple gases enter the first mixing chamber; S3, gas mixing, the multiple gases are mixed and stirred under the action of the first mixing part and the second mixing part to achieve full mixing of the multiple gases; S4, pressure regulation and concentration detection. After the mixed gas enters the discharge pipe, the concentration sensor and the gas pressure sensor perform pressure detection and concentration detection on the mixed gas, and feed back the detection results to the controller. The controller controls the flow regulating valve and the air pressure regulating valve to adjust the gas input ratio and mixing parameters until the mixed gas meets the standard and the pressure of the mixed gas is balanced. S5. Output qualified mixed gas for subsequent use.

[0012] By adopting the above technical solution, the present invention has the following beneficial effects: The multiple gases are mixed in sequence by the first mixing section and the second mixing section, thereby improving the mixing effect of the multiple gases. The flow regulating valve and the concentration sensor are used to accurately control the mixing ratio of the multiple gases, thereby accurately controlling the mixing ratio of the multiple gases. The pressure of the mixed gas is also monitored in real time by the gas pressure sensor. The gas pressure regulating valve is used to adjust the output pressure of the mixed gas so that the pressure of the mixed gas is stabilized within a safe range. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are part of this application and are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings: Figure 1 A schematic diagram of the structure of a high-precision gas mixing device provided in this embodiment of the present application; Figure 2 A cross-sectional view of a high-precision gas mixing device provided in this embodiment of the present application; Figure 3 This is a schematic diagram of the structure of the stirring mechanism of the high-precision gas mixing device provided in this embodiment of the present application.

[0014] Figure numerals: 1. mixing tank; 2. gas storage tank; 3. front plate; 4. back plate; 5. flow control valve; 6. discharge pipe; 7. concentration sensor; 8. air pressure regulating valve; 9. guide funnel; 10. baffle; 11. drive motor; 12. drive shaft; 13. stirring blade; 14. diverter plate; 15. second mixing section.

[0015] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0016] The specific implementation modes of the present invention are further described in detail with reference to the accompanying drawings.

[0017] See also Figures 1 to 3As shown, the embodiment of the present application provides a high-precision gas mixing device, including: a mixing tank 1, multiple gas storage tanks 2, a stirring mechanism, a detection component and a controller. Different types of gases are stored in the multiple gas storage tanks 2 respectively. The mixing tank 1 adopts a cylindrical stainless steel cavity. The mixing tank 1 is provided with a first mixing chamber, a second mixing chamber and a third mixing chamber that are connected from left to right. The third mixing chamber is connected to a discharge pipe 6. The multiple gas storage tanks 2 are respectively connected to the first mixing chamber. Each gas storage tank 2 is provided with a flow regulating valve 5. Each gas storage tank 2 is also provided with a flow regulating valve 6. The sensor is used to monitor the output gas flow rate. The stirring mechanism includes a first mixing part and a second mixing part 15. The first mixing part is arranged in the second mixing chamber, and the second mixing part 15 is arranged in the third mixing chamber. The detection component includes a concentration sensor 7 and a gas pressure sensor arranged on the discharge pipe 6. The discharge pipe 6 is also provided with an air pressure regulating valve 8. A gas composition analyzer is also provided on the right side of the air pressure regulating valve 8. The controller is electrically connected to the concentration sensor 7 and the gas pressure sensor respectively. The controller is used to control the start and stop of the flow regulating valve 5 and the air pressure regulating valve 8.

[0018] In the above scheme, the multiple gases are mixed in sequence by the first mixing section and the second mixing section 15, thereby improving the mixing effect of the multiple gases, and the flow regulating valve 5 and the concentration sensor 7 are provided to facilitate accurate control of the mixing ratio of the multiple gases, thereby accurately controlling the mixing ratio of the multiple gases, and the pressure of the mixed gas is monitored in real time by the provided gas pressure sensor, and the gas pressure regulating valve 8 is used to adjust the output pressure of the mixed gas so that the pressure of the mixed gas is stabilized within a safe range.

[0019] In some possible implementations, see Figure 2 and Figure 3 As shown, the first mixing section includes a guide funnel 9, the diameter of which gradually decreases from left to right, and the maximum diameter of the guide funnel 9 is equal to the inner diameter of the mixing tank 1. The outer circular edge of the guide funnel 9 is fixedly connected to the inner wall of the mixing tank 1. The guide funnel 9 is used to converge the various gases in the first mixing section to facilitate subsequent uniform mixing of the various gases.

[0020] In some possible implementations, see Figure 2 and Figure 3As shown, the first mixing part also includes a driving shaft 12 rotatably arranged in the second mixing chamber, the driving shaft 12 is coaxially arranged with the mixing tank 1, and a plurality of stirring blades 13 are evenly arranged on the circumferential side of the driving shaft 12. A movably connected baffle 10 is also sleeved on the driving shaft 12, and the baffle 10 is fixedly arranged in the mixing tank 1. The bottom of the baffle 10 is fixedly arranged in the mixing tank 1 through a mounting seat. The end of the driving shaft 12 away from the guide funnel 9 is connected to a driving motor 11, and the driving motor 11 is fixedly mounted on the baffle 10. The driving motor 11 is connected to the controller electrical signal, and the plurality of stirring blades 13 are all inclined to facilitate the formation of negative pressure in the second mixing chamber, thereby facilitating the various gases in the first mixing chamber to enter the second mixing chamber.

[0021] In the above scheme, when multiple gases are mixed, the drive motor 11 is controlled to start. The drive motor 11 starts to drive the drive shaft 12 to rotate through its output shaft. The rotation of the drive shaft 12 drives the multiple stirring blades 13 to rotate, forming a negative pressure in the second mixing chamber, thereby facilitating the multiple gases in the first mixing chamber to enter the second mixing chamber.

[0022] In some possible implementations, see Figure 2 and Figure 3 As shown, the baffle 10 is a truncated cone structure, and the arc surface of the truncated cone structure is concave toward the side away from the guide funnel 9, and a plurality of diverter plates 14 are evenly arranged on the arc surface of the truncated cone structure.

[0023] In the above scheme, after the multiple gases rotate into the second mixing chamber through the multiple stirring blades 13, they are dispersed on the baffle 10 and diverted by the multiple diverter plates 14, thereby entering the third mixing chamber.

[0024] In some possible implementations, see Figure 2 and Figure 3 As shown, the second mixing part 15 is a circulating fan, which is used to blow the fusion gas out in a spiral shape and stir the mixed gas in the third mixing chamber to mix the multiple gases again, thereby improving the mixing efficiency and mixing effect of the multiple gases.

[0025] In some possible implementations, see Figure 1 and Figure 2 As shown, the two ends of the mixing tank 1 are respectively provided with a front plate 3 and a back plate 4 which are sealed and connected, and a discharge pipe 6 is arranged on the back plate 4 .

[0026] It should be noted that a first mixing chamber is formed between the front plate 3 and the guide funnel 9 , a second mixing chamber is formed between the guide funnel 9 and the second mixing portion 15 , and a third mixing chamber is formed between the second mixing portion 15 and the back plate 4 .

[0027] A high-precision gas mixing method, applied to the above-mentioned high-precision gas mixing device, comprises the following steps: S1, gas preparation, according to the type and proportion of the required mixed gas, open the required gas tank 2 through the controller; S2, gas input, setting the flow parameters of the gas storage tank 2 through the flow regulating valve 5, so that multiple gases enter the first mixing chamber; S3, gas mixing, the multiple gases are mixed and stirred under the action of the first mixing part and the second mixing part 15 to achieve full mixing of the multiple gases; S4, pressure regulation and concentration detection. After the mixed gas enters the discharge pipe 6, the concentration sensor 7 and the gas pressure sensor perform pressure detection and concentration detection on the mixed gas, and feed back the detection results to the controller. The controller controls the flow regulating valve 5 and the air pressure regulating valve 8 to adjust the gas input ratio and mixing parameters until the mixed gas meets the standard and the pressure of the mixed gas is balanced. S5. Output qualified mixed gas for subsequent use.

[0028] Example 1: Mixing of oxygen and nitrogen Preset requirements: Prepare an oxygen-nitrogen mixed gas with an oxygen volume fraction of 30% and a total flow rate of 100 liters / minute.

[0029] Gas input: The flow rate of the oxygen input channel was set to 30 L / min, and the flow rate of the nitrogen input channel was set to 70 L / min.

[0030] Flow monitoring: The actual flow rate monitored by the oxygen flow sensor is 29.5 liters / minute, and the actual flow rate monitored by the nitrogen flow sensor is 70.5 liters / minute.

[0031] Control and adjustment: The controller fine-tunes the oxygen flow regulating valve 5 according to the monitoring data to increase the oxygen flow to 30 liters / minute, and fine-tunes the nitrogen flow regulating valve 5 to reduce the nitrogen flow to 70 liters / minute.

[0032] Mixing and detection: After being fully mixed by the stirring mechanism and after the pressure is adjusted by the gas pressure regulating valve 8, the gas composition analyzer detects that the oxygen volume fraction is 29.8%.

[0033] Feedback and adjustment: The detection results are fed back to the controller, and the controller fine-tunes the oxygen flow control valve 5 again to increase the oxygen input, and finally the oxygen volume fraction in the mixed gas reaches 30%.

[0034] Example 2: Mixture of carbon dioxide, argon and helium Preset requirements: Prepare a mixed gas with a carbon dioxide volume fraction of 15%, an argon volume fraction of 35%, and a helium volume fraction of 50%, with a total flow rate of 200 liters / minute.

[0035] Gas input: The flow rate of the carbon dioxide input channel was set to 30 L / min, the flow rate of the argon input channel was set to 70 L / min, and the flow rate of the helium input channel was set to 100 L / min.

[0036] Flow monitoring: The actual flow rate monitored by the carbon dioxide flow sensor is 29 liters / minute, the actual flow rate monitored by the argon flow sensor is 69 liters / minute, and the actual flow rate monitored by the helium flow sensor is 102 liters / minute.

[0037] Control and adjustment: The controller fine-tunes the flow regulating valve 5 of each gas input channel respectively, so that the carbon dioxide flow rate increases to 30 liters / minute, the argon flow rate increases to 70 liters / minute, and the helium flow rate decreases to 100 liters / minute.

[0038] Mixing and detection: After sufficient mixing, after the pressure is adjusted by the gas pressure regulating valve 8, the gas composition analyzer detects that the volume fraction of carbon dioxide is 14.5%, the volume fraction of argon gas is 34.8%, and the volume fraction of helium gas is 50.7%.

[0039] Feedback and adjustment: The detection results are fed back to the controller, which further fine-tunes the flow control valve 5 on each gas input channel, ultimately making the volume fraction of each gas in the mixed gas reach 15%, 35% and 50% respectively.

[0040] This specific embodiment is merely an explanation of the invention and is not a limitation of the invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as they are within the scope of protection of the invention, they are protected by patent law.

Claims

1. A high-precision gas mixing device, characterized in that: include: A mixing tank (1), wherein a first mixing chamber, a second mixing chamber and a third mixing chamber are arranged in sequence from left to right in the mixing tank (1), and the third mixing chamber is connected to a discharge pipe (6); A plurality of gas storage tanks (2), wherein the plurality of gas storage tanks (2) are respectively connected to the first mixing chamber, and each gas storage tank (2) is provided with a flow regulating valve (5); a stirring mechanism, the stirring mechanism comprising a first mixing part and a second mixing part (15), the first mixing part being arranged in the second mixing chamber, and the second mixing part (15) being arranged in the third mixing chamber; A detection component, the detection component comprising a concentration sensor (7) and a gas pressure sensor arranged on the discharge pipe (6); the discharge pipe (6) is also provided with a gas pressure regulating valve (8); A controller, the controller being electrically connected to the concentration sensor (7) and the gas pressure sensor respectively, and the controller being used to control the start and stop of the flow regulating valve (5) and the gas pressure regulating valve (8).

2. The high-precision gas mixing device according to claim 1, characterized in that: The first mixing section comprises a guide funnel (9), the diameter of the guide funnel (9) gradually decreases from left to right, and the maximum diameter of the guide funnel (9) is equal to the inner diameter of the mixing tank (1).

3. The high-precision gas mixing device according to claim 2, characterized in that: The first mixing section further comprises a driving shaft (12) rotatably arranged in the second mixing chamber; The driving shaft (12) is coaxially arranged with the mixing tank (1); A plurality of stirring blades (13) are evenly arranged on the circumferential side of the driving shaft (12); The driving shaft (12) is also sleeved with a movably connected baffle (10), and the baffle (10) is fixedly arranged in the mixing tank (1); The end of the driving shaft (12) facing away from the diversion funnel (9) is connected to a driving motor (11), and the driving motor (11) is fixedly mounted on the baffle (10).

4. The high-precision gas mixing device according to claim 3, characterized in that: The baffle (10) is a truncated cone structure, and the arc surface of the truncated cone structure is recessed toward the side away from the diversion funnel (9); A plurality of flow divider plates (14) are evenly arranged on the arc surface of the truncated cone structure.

5. The high-precision gas mixing device according to claim 1, characterized in that: The second mixing part (15) is a circulating fan, which is used to blow the fusion gas out in a spiral shape and stir the mixed gas in the third mixing chamber.

6. The high-precision gas mixing device according to claim 1, characterized in that: The mixing tank (1) has a front plate (3) and a back plate (4) respectively at two ends thereof which are sealed and connected; The discharge pipe (6) is arranged on the back plate (4).

7. A high-precision gas mixing method, applied to the high-precision gas mixing device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, gas preparation, opening the required gas storage tank (2) through the controller according to the type and proportion of the required mixed gas; S2, gas input, setting the flow parameters of the gas storage tank (2) through the flow regulating valve (5) so that multiple gases enter the first mixing chamber; S3, gas mixing, the multiple gases are mixed and stirred under the action of the first mixing part and the second mixing part (15), so as to achieve full mixing of the multiple gases; S4, pressure regulation and concentration detection. After the mixed gas enters the discharge pipe (6), the concentration sensor (7) and the gas pressure sensor perform pressure detection and concentration detection on the mixed gas, and feed back the detection results to the controller. The controller controls the flow control valve (5) and the gas pressure control valve (8) to adjust the gas input ratio and mixing parameters until the mixed gas meets the standard and the pressure of the mixed gas is balanced. S5. Output qualified mixed gas for subsequent use.

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