Micro-flow three-gas mixing control structure with quick and stable response

Abstract

The utility model provides a micro-flow three-gas mixing control structure which is quick and stable in response, and belongs to the technical field of gas flow control. The micro-flow three-gas mixing control structure rapid and stable in response comprises a high-pressure stabilizing valve body assembly and a gas converging assembly. The first gas valve terminal assembly comprises a first gas valve terminal valve body, an electromagnetic valve and a high-precision gas resistor, the gas outlet end of the first gas valve terminal valve body is connected with the gas inlet end of the electromagnetic valve, the gas outlet end of the electromagnetic valve is connected with the gas inlet end of the high-precision gas resistor, and the gas inlet end of the first gas valve terminal valve body is communicated with a proportional valve; the pressure of the high-pressure gas is reduced to a proper pressure through the pressure reducing valve, the proportional valve plays a role in stabilizing the pressure of the gas flow, and then the flow is controlled by permutation and combination of different high-precision gas resistors, so that the flow is accurately controlled from small to large. Stable and accurate control of micro flow and rapid response of micro flow change are achieved.

Description

Technical Field

[0001] This application relates to the field of airflow control, and more specifically, to a micro-flow three-gas mixing control structure that is fast-responding and stable. Background Technology

[0002] Currently, to achieve precise control of minute flow rates and rapid response to flow changes, and for precise control of tidal volumes less than 3 ml, the main minute flow control technologies applied to ventilators include electric turbine flow control and high-pressure gas electronically controlled proportional valve flow control.

[0003] Since both existing technologies control flow through an electronically controlled coil structure, they utilize changes in current to change turbine speed, thereby changing the flow rate, or changes in suction force in a proportional valve to change the opening of the proportional valve, thus indirectly altering the flow rate.

[0004] The characteristics of electrical signals inherently present issues with accuracy and timeliness of response. For example, when the current increases from 1A to 2A, the current change requires a certain amount of time, which constitutes a response time. Around 2A, because the current needs to be adjusted to 2A, the adjustment step size is smaller, thus requiring a certain amount of time, forming a second response time. Therefore, this leads to the problem of insufficiently timely response.

[0005] When the current stabilizes at 2A, a fluctuation error will occur around 2A, which introduces the first accuracy error. Furthermore, the coil's resistance is affected by temperature. When the coil operates for a long time, its temperature will rise, affecting the coil's resistance and causing changes in the current, which introduces the second accuracy error.

[0006] Therefore, both electric turbine flow control and high-pressure gas electro-proportional valve flow control technologies have certain shortcomings in terms of control accuracy and response timeliness. Utility Model Content

[0007] To overcome the above deficiencies, this application provides a micro-flow three-gas mixing control structure that is fast-responding and stable, aiming to improve the shortcomings in the accuracy or timeliness of flow control technology.

[0008] This application provides a micro-flow three-gas mixing control structure with rapid response and stability, including a high-pressure stabilizing valve body assembly and a gas confluence assembly;

[0009] A gas valve island structure is provided after the high-pressure stabilizing valve body assembly. At least three gas valve island structures are provided: a first gas valve island assembly, a second gas valve island assembly, and a third gas valve island assembly. The first gas valve island assembly includes a first gas valve island valve body, a solenoid valve, and a high-precision gas resistor. The outlet end of the first gas valve island valve body is connected to the inlet end of the solenoid valve, and the outlet end of the solenoid valve is connected to the inlet end of the high-precision gas resistor. The inlet end of the first gas valve island valve body is connected to a proportional valve, which is connected to a pressure reducing valve. The inlet end of the pressure reducing valve is connected to a high-pressure inlet. The three gas valve island structures have the same gas path principle. The gas confluence assembly is connected to a three-way flow sensor assembly, which is connected to a three-gas mixing valve block assembly, which is connected to a differential pressure gas resistor valve block assembly, and the differential pressure gas resistor valve block assembly is connected to a total gas path flow sensor.

[0010] In a preferred embodiment of this utility model, the gas confluence assembly is fixedly connected to the high-pressure stabilizing valve body assembly, and any one of the inlet and outlet ports of the gas confluence assembly is connected in series between the flow sensor and the proportional valve for gas confluence.

[0011] In a preferred embodiment of this utility model, the first gas valve island assembly further includes a high-pressure stabilizing valve body, the high-pressure inlet is fixed to the inlet end of the high-pressure stabilizing valve body, the high-pressure stabilizing valve body is equipped with a safety valve, and the safety valve is connected in parallel before the pressure reducing valve.

[0012] In a preferred embodiment of this invention, a first high-pressure sensor is installed at the inlet end of the pressure reducing valve, and a first sealing element is provided at the interface between the high-pressure stabilizing valve body and the high-pressure inlet to provide a sealing function. The first high-pressure sensor is designed before the pressure reducing valve to detect gas pressure, triggering an alarm when the pressure is too high or too low. A safety valve is also designed on one side of the pressure reducing valve; when the pressure reaches the safety valve's design pressure, the high-pressure gas is discharged from here to prevent damage to subsequent components caused by high pressure.

[0013] In a preferred embodiment of this utility model, the high-pressure stabilizing valve body is equipped with a snap-fit ​​structure for positioning and snapping the high-pressure air inlet, and a filter is installed at the snap-fit ​​structure, the filter being disposed inside the air inlet of the high-pressure stabilizing valve body.

[0014] In a preferred embodiment of this invention, the high-pressure inlet is fixedly connected to the high-pressure stabilizing valve body assembly, with one end extending outside the assembly. The proportional valve is equipped with a second high-pressure sensor for detecting gas pressure. After passing through a pressure reducing valve, the high-pressure gas is reduced to a suitable and stable pressure before entering the proportional valve. The proportional valve and the second high-pressure sensor form a closed-loop feedback system. The proportional valve controls the pressure by adjusting its opening, while the second high-pressure sensor monitors the pressure in real time. Any deviation is fed back to the main controller, which adjusts the opening of the proportional valve, thus outputting a stable pressure airflow. The airflow passing through the second high-pressure sensor is finally output through a quick-connect elbow.

[0015] In a preferred embodiment of this utility model, the differential pressure gas resistance valve block assembly includes a second differential pressure gas resistance valve block, a first differential pressure gas resistance valve block, and a gas resistance element. The second differential pressure gas resistance valve block and the first differential pressure gas resistance valve block are connected to form an airflow cavity. The gas resistance element is disposed in the airflow cavity. A first gas connector communicating with the airflow cavity is fixed to the outer wall of the second differential pressure gas resistance valve block. A fourth gas connector communicating with the airflow cavity is fixed to the outer wall of the first differential pressure gas resistance valve block. A concentration sensor for detecting the gas passing through the airflow cavity is fixed to the outer wall of the differential pressure gas resistance valve block assembly.

[0016] In a preferred embodiment of this invention, a second gas connector communicating with the airflow chamber is fixed to the side wall of the second differential pressure resistance valve block, and a third gas connector communicating with the airflow chamber is fixed to the side wall of the first differential pressure resistance valve block. The concentration sensor is fixedly installed at the ports of the second gas connector and the third gas connector. The airflow direction in the differential pressure resistance valve block assembly is as indicated by the arrow; the gas resistance creates a pressure difference, allowing the airflow to enter the sensor, which can then detect the concentration of the airflow.

[0017] In a preferred embodiment of this utility model, the first gas connector and the fourth gas connector are disposed on both sides of the gas resistance component, a third sealing element is provided on the mating surface of the second differential pressure gas resistance valve block and the first differential pressure gas resistance valve block, and a second sealing element is provided between the outer wall of the gas resistance component and the inner wall of the airflow cavity.

[0018] Beneficial Effects: This application provides a rapid and stable micro-flow three-gas mixing control structure. A pressure reducing valve reduces the high-pressure gas to a suitable pressure, while a proportional valve stabilizes the gas flow pressure. Then, by arranging and combining different high-precision gas resistances, the flow rate is controlled, achieving precise control from small to large flow rates. The three gases are mixed in a three-gas mixing valve block assembly and output to a differential pressure gas resistance valve block assembly. The gas in the differential pressure gas resistance valve block assembly passes through a flow sensor to monitor the total flow rate. This achieves stable and accurate control of minute flow rates, as well as rapid response to minute flow rate changes. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a top view schematic diagram of the micro-flow three-gas mixing control structure that provides a rapid and stable response according to the embodiments of this application;

[0021] Figure 2 A schematic diagram of the installation position structure of the first gas valve island valve body provided for an embodiment of this application;

[0022] Figure 3 A side view structural diagram provided for an embodiment of this application;

[0023] Figure 4 Provided for the implementation of this application Figure 2 Schematic diagram of the cross-section at point AA;

[0024] Figure 5 Provided for the implementation of this application Figure 2 Schematic diagram of the cross-section at point BB;

[0025] Figure 6 A schematic diagram of the differential pressure air resistance valve block assembly provided in the embodiments of this application;

[0026] Figure 7 Provided for the implementation of this application Figure 6 Schematic diagram of the cross-section at the CC point.

[0027] In the diagram: 1. High-pressure stabilizing valve body assembly; 2. Gas manifold assembly; 3. First gas valve island assembly; 4. Three-way flow sensor assembly; 5. Three-gas mixing valve block assembly; 6. Differential pressure gas resistance valve block assembly; 7. Total gas path flow sensor; 8. Second gas valve island assembly; 9. Third gas valve island assembly; 10. Snap-fit ​​structure; 11. Pressure reducing valve; 12. Safety valve; 13. First high-pressure sensor; 14. High-pressure stabilizing valve body; 15. First seal; 16. Filter; 7. High-pressure air inlet; 18. Second high-pressure sensor; 19. Proportional valve; 20. First gas valve island body; 21. Solenoid valve; 22. High-precision gas resistance; 23. Flow sensor; 24. First gas connector; 25. Second differential pressure gas resistance valve block; 26. Second gas connector; 27. Third gas connector; 28. First differential pressure gas resistance valve block; 29. ​​Fourth gas connector; 30. Second seal; 31. Gas resistance element; 32. Third seal; 33. Concentration sensor. Detailed Implementation

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0031] Please see Figures 1-7 This utility model provides a micro-flow three-gas mixing control structure that is fast-responding and stable, including a high-pressure stabilizing valve body assembly 1 and a gas confluence assembly 2;

[0032] A gas valve island structure is provided after the high-pressure stabilizing valve body assembly 1. At least three gas valve island structures are provided: a first gas valve island assembly 3, a second gas valve island assembly 8, and a third gas valve island assembly 9. The first gas valve island assembly 3 includes a first gas valve island valve body 20, a solenoid valve 21, and a high-precision gas resistor 22. The outlet end of the first gas valve island valve body 20 is connected to the inlet end of the solenoid valve 21, and the outlet end of the solenoid valve 21 is connected to the inlet end of the high-precision gas resistor 22. The inlet end of the first gas valve island valve body 20 is connected to a proportional valve 19, which is connected to a pressure reducing valve 11. The inlet end of the pressure reducing valve 11 is connected to a high-pressure inlet 17. The three gas valve island structures have the same gas path principle. The gas mixing component 2 is connected to a three-way flow sensor component 4, which is connected to a three-gas mixing valve block component 5. The three-gas mixing valve block component 5 is connected to a differential pressure gas resistance valve block component 6, which is connected to a total gas path flow sensor 7.

[0033] like Figures 1 to 4 As shown, the high-pressure gas pressure is reduced to a suitable pressure by the pressure reducing valve 11, and the proportional valve 19 plays the role of stabilizing the airflow pressure. Then, the flow rate is controlled by arranging and combining different high-precision air resistances 22, thereby achieving precise control of the flow rate from small to large. The principle of the three-way gas is similar.

[0034] In a specific embodiment of this utility model, the gas confluence component 2 is fixedly connected to the high-pressure stabilizing valve body component 1, and any one of the inlet and outlet ports of the gas confluence component 2 is connected in series between the flow sensor and the proportional valve 19 for gas confluence.

[0035] like Figure 4 As shown, in a specific embodiment of this utility model, the first gas valve island assembly 3 further includes a high-pressure stabilizing valve body 14, the high-pressure air inlet 17 is fixed to the air inlet end of the high-pressure stabilizing valve body 14, the high-pressure stabilizing valve body 14 is equipped with a safety valve 12, and the safety valve 12 is connected in parallel before the pressure reducing valve 11.

[0036] In a specific embodiment of this utility model, a first high-pressure sensor 13 is installed at the air inlet end of the pressure reducing valve 11, and a first sealing element 15 is provided at the interface between the high-pressure stabilizing valve body 14 and the high-pressure air inlet 17 to provide a sealing function. The first high-pressure sensor 13 is designed before the pressure reducing valve 11 to detect gas pressure, triggering an alarm when the pressure is too high or too low. A safety valve 12 is designed on one side of the pressure reducing valve 11; when the pressure reaches the design pressure of the safety valve 12, the high-pressure gas is discharged from here to prevent damage to subsequent components caused by high pressure.

[0037] In a specific embodiment of this utility model, the high-pressure stabilizing valve body 14 is equipped with a snap-fit ​​structure 10 for positioning and snapping the high-pressure air inlet 17, and a filter 16 is installed at the snap-fit ​​structure 10. The filter 16 is disposed inside the air inlet of the high-pressure stabilizing valve body 14.

[0038] like Figure 5 As shown in the specific embodiment of this utility model, the high-pressure air inlet 17 is fixedly connected to the high-pressure stabilizing valve body assembly 1, and one end of the high-pressure air inlet 17 extends to the outside of the high-pressure stabilizing valve body assembly 1; the proportional valve 19 is equipped with a second high-pressure sensor 18 for detecting air pressure. After the high-pressure gas passes through the pressure reducing valve 11 and is reduced to a suitable and stable pressure, it enters the proportional valve 19. The proportional valve 19 and the second high-pressure sensor 18 form a closed-loop feedback system. The proportional valve 19 controls the pressure by adjusting its opening, while the second high-pressure sensor 18 monitors the pressure in real time. When a deviation occurs, it feeds back to the main controller, thereby adjusting the opening of the proportional valve 19, thus outputting a stable pressure airflow. The airflow passing through the second high-pressure sensor 18 is finally output through a quick-connect elbow.

[0039] like Figure 7 As shown, in a specific embodiment of this utility model, the differential pressure gas resistance valve block assembly 6 includes a second differential pressure gas resistance valve block 25, a first differential pressure gas resistance valve block 28, and a gas resistance element 31. The second differential pressure gas resistance valve block 25 and the first differential pressure gas resistance valve block 28 are connected to form an airflow cavity. The gas resistance element 31 is disposed in the airflow cavity. A first gas connector 24 communicating with the airflow cavity is fixed on the outer wall of the second differential pressure gas resistance valve block 25. A fourth gas connector 29 communicating with the airflow cavity is fixed on the outer wall of the first differential pressure gas resistance valve block 28. A concentration sensor 33 for detecting the gas passing through the airflow cavity is fixed on the outer wall of the differential pressure gas resistance valve block assembly 6.

[0040] In a specific embodiment of this utility model, a second gas connector 26 communicating with the airflow cavity is fixed to the side wall of the second differential pressure gas resistance valve block 25, and a third gas connector 27 communicating with the airflow cavity is fixed to the side wall of the first differential pressure gas resistance valve block 28. The concentration sensor 33 is fixedly installed at the ports of the second gas connector 26 and the third gas connector 27. The airflow direction in the differential pressure gas resistance valve block assembly 6 is as indicated by the arrow. The gas resistance generates a pressure difference, allowing the airflow to enter the sensor, which can then detect the concentration of the airflow.

[0041] In a specific embodiment of this utility model, the first gas connector 24 and the fourth gas connector 29 are disposed on both sides of the gas resistance member 31, the second differential pressure gas resistance valve block 25 and the first differential pressure gas resistance valve block 28 are provided with a third sealing member 32, and a second sealing member 30 is provided between the outer wall of the gas resistance member 31 and the inner wall of the airflow cavity.

[0042] The working principle of this rapid and stable micro-flow three-gas mixing control structure is as follows: In use, the example shown here is the first valve island assembly 3, which only demonstrates one gas path. The second and third gas island assemblies 8 and 9, respectively, consist of multiple paths. The gas flows from different paths can be arranged and combined to achieve the required gas volume, which then enters the gas merging chamber, where multiple gas paths merge into one output. High-pressure gas exits from the quick-connect elbow and enters the first gas island assembly 20, passing through the solenoid valve 21. The solenoid valve 21's on / off state controls the flow of gas. After passing through the solenoid valve 21, the gas passes through the high-precision gas resistor 22 to achieve the required gas flow rate. Then, the flow sensor 23 monitors the flow rate in real time, forming a closed-loop control system with the solenoid valve 21. The three gas paths are then mixed in the three-gas mixing valve block assembly 5 and output to the differential pressure gas resistor valve block assembly 6. Finally, the gas in the differential pressure gas resistor valve block assembly 6 passes through the flow sensor 23 for total flow monitoring. It achieves stable and accurate control of minute flow rates, as well as rapid response to minute flow rate changes.

[0043] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

Claims

1. A micro-flow three-gas mixing control structure with rapid response and stability, characterized in that, include A high-pressure stabilizing valve body assembly (1) is provided with a gas valve island structure. The gas valve island structure is provided with at least three gas valve island assemblies, namely a first gas valve island assembly (3), a second gas valve island assembly (8), and a third gas valve island assembly (9). The first gas valve island assembly (3) includes a first gas valve island valve body (20), a solenoid valve (21), and a high-precision gas resistor (22). The outlet end of the first gas valve island valve body (20) is connected to the inlet end of the solenoid valve (21), and the outlet end of the solenoid valve (21) is connected to the inlet end of the high-precision gas resistor (22). The inlet end of the first gas valve island valve body (20) is connected to a proportional valve (19), and the proportional valve (19) is connected to a pressure reducing valve (11). The inlet end of the pressure reducing valve (11) is connected to a high-pressure inlet (17). The gas circuit principle of the three gas valve island structures is the same. Gas merging assembly (2), the gas merging assembly (2) is connected to a three-way flow sensor assembly (4), the three-way flow sensor assembly (4) is connected to a three-gas mixing valve block assembly (5), the three-gas mixing valve block assembly (5) is connected to a differential pressure gas resistance valve block assembly (6), the differential pressure gas resistance valve block assembly (6) is connected to a total gas path flow sensor (7).

2. The micro-flow three-gas mixing control structure with rapid response and stability according to claim 1, characterized in that, The differential pressure gas resistance valve block assembly (6) includes a second differential pressure gas resistance valve block (25), a first differential pressure gas resistance valve block (28), and a gas resistance element (31). The second differential pressure gas resistance valve block (25) and the first differential pressure gas resistance valve block (28) are connected to form an airflow cavity. The gas resistance element (31) is disposed in the airflow cavity. The outer wall of the second differential pressure gas resistance valve block (25) is fixed with a first gas connector (24) communicating with the airflow cavity. The outer wall of the first differential pressure gas resistance valve block (28) is fixed with a fourth gas connector (29) communicating with the airflow cavity.

3. The micro-flow three-gas mixing control structure with rapid response and stability according to claim 1, characterized in that, The first gas valve island assembly (3) also includes a high pressure stabilizing valve body (14), the high pressure inlet (17) is fixed to the inlet end of the high pressure stabilizing valve body (14), the high pressure stabilizing valve body (14) is equipped with a safety valve (12), and the safety valve (12) is connected in parallel before the pressure reducing valve (11).

4. The micro-flow three-gas mixing control structure with rapid response and stability according to claim 1, characterized in that, The pressure reducing valve (11) is equipped with a first high pressure sensor (13) at the air inlet end, and the high pressure stabilizing valve body (14) is connected to the high pressure air inlet (17) with a first sealing element (15) that plays a sealing role.

5. The micro-flow three-gas mixing control structure with rapid response and stability according to claim 1, characterized in that, The high-pressure stabilizing valve body (14) is equipped with a snap-fit ​​structure (10) for positioning and snapping the high-pressure air inlet (17). A filter (16) is installed at the snap-fit ​​structure (10), and the filter (16) is located inside the air inlet of the high-pressure stabilizing valve body (14).

6. The micro-flow three-gas mixing control structure with rapid response and stability according to claim 1, characterized in that, The high-pressure air inlet (17) is fixedly connected to the high-pressure stabilizing valve body assembly (1), and one end of the high-pressure air inlet (17) extends to the outside of the high-pressure stabilizing valve body assembly (1).

7. The micro-flow three-gas mixing control structure with rapid response and stability according to claim 2, characterized in that, The outer wall of the differential pressure gas resistance valve block assembly (6) is fixed with a concentration sensor (33) for detecting the gas concentration passing through the gas flow chamber. The gas converging assembly (2) is fixedly connected to the high pressure stabilizing valve body assembly (1). Any inlet or outlet port of the gas converging assembly (2) is connected in series between the flow sensor and the proportional valve (19) for gas converging.

8. The micro-flow three-gas mixing control structure with rapid response and stability according to claim 7, characterized in that, The second differential pressure gas resistance valve block (25) has a second gas connector (26) that communicates with the airflow cavity fixed on its side wall, and the first differential pressure gas resistance valve block (28) has a third gas connector (27) that communicates with the airflow cavity fixed on its side wall. The concentration sensor (33) is fixedly installed at the ports of the second gas connector (26) and the third gas connector (27).

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