An automatic oxygen concentration adjustment system and method for a ventilator

Abstract

This invention discloses an automatic oxygen concentration adjustment system for a ventilator, comprising an oxygen supply module, an air supply module, a gas mixing module, a gas output module, a detection module, and a control module. The gas mixing module includes an initial mixing unit and a secondary mixing unit. The initial mixing unit is equipped with a first concentration detection device, and the secondary mixing unit is equipped with a second concentration detection device. The initial mixing unit includes an outer shell and an inner shell. An oxygen inlet is provided at the upper part of the inner shell, and an air inlet is provided at the bottom of the outer shell. The inner shell includes an upper mixing section, a middle mixing section, and a lower mixing section that are connected to each other. An air inlet is provided on the upper mixing section, and the air inlets are distributed in a gradually denser manner from top to bottom. The diameter of the upper mixing section is larger than that of the middle mixing section, and the diameter of the lower mixing section is larger than that of the upper mixing section. A first fan is provided at the bottom of the air chamber. The lower mixing section is connected to the secondary mixing unit through a connecting pipe, and a second fan and a first concentration detection device are provided inside the connecting pipe.

Description

Technical Field

[0001] This invention belongs to the field of intelligent oxygen concentration regulation technology for ventilators, and particularly relates to an automatic oxygen concentration regulation system and method for ventilators. Background Technology

[0002] In modern clinical medicine, ventilators, as an effective means of artificially replacing spontaneous ventilation, are widely used for respiratory failure caused by various reasons, anesthetic respiratory management during major surgery, respiratory support therapy, and emergency resuscitation, occupying a very important position in the field of modern medicine. Therapeutic ventilators generally have two gas sources: oxygen and air, which allows for a wider range of oxygen concentration adjustment. Chinese patent CN112370623B discloses an intelligent ventilator adjustment system that adjusts oxygen concentration by controlling the opening and closing of valves based on respiratory efficiency comparisons.

[0003] Chinese patent application CN113244496A discloses a method for controlling the output oxygen concentration of a ventilator. It mainly calculates the final tidal volume and opening time of two proportional valves based on the set overall output tidal volume and oxygen concentration of the ventilator, the oxygen concentration of the two input gases, and the inspiratory time. Then, based on the detection and feedback of the tidal volume, the error between the output tidal volume of different proportional valves and the calculated value is finely adjusted until the output tidal volume of each proportional valve can meet the calculated value, so as to meet the set output oxygen concentration requirements.

[0004] As the aforementioned documents indicate, oxygen concentration adjustment is based on changes in tidal volume, and then the oxygen concentration is mixed according to the exhaled tidal volume. This scheme provides a relatively comprehensive adjustment method, namely, achieving an accurate output gas volume through the control of a proportional valve. However, due to the possibility of uneven gas mixing during the mixing process, it remains difficult to guarantee the precision of oxygen concentration adjustment. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic oxygen concentration adjustment system and method for a ventilator, in order to solve the problem that uneven gas mixing occurs during the gas mixing process in existing ventilators, making it difficult to ensure the accuracy of oxygen concentration adjustment.

[0006] To achieve the objectives of this invention, an automatic oxygen concentration regulation system for a ventilator is disclosed, comprising an oxygen supply module, an air supply module, a gas mixing module, a gas output module, a detection module, and a control module. The control module controls the output volume of the oxygen supply module and the air supply module, and simultaneously controls the mixing of air and oxygen by the gas mixing module, providing positive feedback regulation. The detection module provides negative feedback regulation to the control module by detecting gas elements from the gas output module. The gas mixing module includes an initial mixing unit and a secondary mixing unit. The initial mixing unit is equipped with a first concentration detection device, and the secondary mixing unit is equipped with... The device includes a second concentration detection device. The initial mixing unit comprises an outer shell and an inner shell. An oxygen chamber is formed inside the inner shell, and an air chamber is formed between the outer shell and the inner shell. An oxygen inlet is provided at the upper part of the inner shell, and an air inlet is provided at the bottom of the outer shell. The inner shell includes an upper mixing section, a middle mixing section, and a lower mixing section connected in sequence. The upper mixing section is provided with a plurality of air inlets, which are distributed in increasing density from top to bottom. The diameter of the upper mixing section is larger than that of the middle mixing section, and the diameter of the lower mixing section is larger than that of the upper mixing section. A first fan is provided at the bottom of the air chamber. The lower mixing section is connected to the secondary mixing unit through a connecting pipe. A second fan is provided inside the connecting pipe, and the first concentration detection device is provided inside the connecting pipe.

[0007] Preferably, the secondary mixing unit includes a mixing chamber and a mixing device disposed within the mixing chamber. The mixing device includes an air outlet plate, a rotating rod disposed within the mixing chamber, a spiral blade disposed on the rotating rod, and a drive motor connected to the rotating rod. The air outlet plate is connected to the rotating rod, the spiral blade is provided with an air passage hole, and the air outlet plate is provided with a plurality of through holes.

[0008] Preferably, the air outlet plate divides the mixing chamber into an upper chamber and a lower chamber, the lower chamber is connected to a connecting pipe, and a secondary oxygen adjustment inlet is provided on the lower chamber.

[0009] Preferably, the vent plate includes a perforated plate body and a closed structure disposed on the perforated plate body, the closed structure being used to adjust the opening of the through hole.

[0010] Preferably, the enclosed structure includes a collection box disposed on a perforated plate and an outer track disposed on the perforated plate. A drive rod is disposed on the perforated plate, one end of which is slidably disposed in the outer track and the other end is disposed on a drive mechanism. A folded sealing cloth is disposed inside the collection box, and the other end of the folded sealing cloth is connected to the drive rod.

[0011] Preferably, the driving mechanism includes an angle drive motor and a turntable disposed at the output end of the angle drive motor, and the drive rod is disposed on the turntable.

[0012] Preferably, the spiral blade, rotating rod, and air outlet plate are all made of non-metallic medical materials, the upper end of the rotating rod is provided with a first magnetic driven plate, and the drive motor is provided with a first magnetic active plate.

[0013] This invention also discloses a method for automatically adjusting the oxygen concentration delivered by a ventilator, comprising the following steps:

[0014] S1. Obtain the required oxygen concentration data; this oxygen concentration acquisition includes the initial selection of values ​​by professionals based on experience and corrections based on actual conditions;

[0015] S2. Based on the required oxygen concentration data, construct a primary oxygen regulation model;

[0016] S3. Concentration is detected by the first concentration detection device. The first concentration detection device uses concentration detection in different sections. By comparing the concentration data of different sections, it is determined whether the mixture is uniform and whether it meets the actual oxygen concentration requirements.

[0017] S4. Analyze the first test results and perform a negative feedback adjustment;

[0018] S5. Based on the final test results, construct a two-stage oxygen regulation model;

[0019] S6. Based on oxygen demand, replenish oxygen from the secondary oxygen inlet and perform concentration detection using a second concentration detection device;

[0020] S7. Perform a second test result analysis and a second negative feedback adjustment;

[0021] S8. The test is qualified, and the mixed gas is output.

[0022] Preferably, the step of performing the first detection result analysis and conducting a negative feedback adjustment includes the following steps:

[0023] S41. Obtain oxygen concentration data for several sections: x1, x2, x3...x i ;

[0024] S42. Perform data homogenization processing: This homogenization process is used to determine the distribution of data, which can then be converted into gas distribution, reflecting whether the mixing is uniform.

[0025] S43. Determine the relationship between d and K. If d > K, proceed to step S44. If d < K, then determine... The relationship between the standard concentration value S and the magnitude of the standard concentration value S, if If <S, then execute S44;

[0026] S44. Stop the second fan, increase the speed of the first fan, mix for a period of time, then start the second fan again and continue with step S41 to determine the operation. The relationship between the size of S and the size of S is determined by... The difference between S and S is used as the parameter for oxygen replenishment in step S6.

[0027] Preferably, the second detection result analysis and secondary negative feedback adjustment includes the following steps:

[0028] S71. Obtain oxygen concentration data for several sections and obtain the corresponding d-values ​​and... value;

[0029] S72, if =S, then execute step S8, if If the value is less than S, the mixed gas will continue to be pumped back to the secondary mixing unit from the return pipe.

[0030] S73. Calculate the oxygen difference and supplement oxygen through the secondary oxygen adjustment inlet;

[0031] S74. Set a standard value A, compare the value of d with A. If d is less than A, the system will operate normally. If d > A, the angle drive motor will be started to drive the turntable to rotate, which in turn drives the folded sealing cloth to complete the sealing of the through hole.

[0032] S75. Repeat steps S71-S74.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] The automatic oxygen concentration adjustment system for ventilator gas delivery of the present invention ensures uniform oxygen distribution in the mixed gas through two mixing and oxygen addition processes, thus ensuring both oxygen concentration and uniform concentration distribution.

[0035] Its secondary mixing unit only includes a connector, which makes it less prone to air leakage. It uses magnetic non-contact transmission, eliminating the need to connect a stirring rod and avoiding the need for the stirring rod to rotate for sealing. In addition, the stirrer uses medical-grade plastic parts, which will not rust.

[0036] In the secondary mixing unit, the gas is first turbulent through the outlet plate, stirred and mixed by the spiral blades, and then turbulent through its air passages to ensure uniform gas mixing.

[0037] The automatic oxygen concentration adjustment method for ventilator delivery of the present invention achieves the target oxygen concentration in the mixed gas through two negative feedback adjustments, while ensuring uniform mixing and making the oxygen concentration the same in each section, thus guaranteeing the accuracy of oxygen concentration adjustment. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the automatic oxygen concentration adjustment system for the ventilator of the present invention;

[0039] Figure 2 This is a schematic diagram of the secondary mixing unit structure of the present invention;

[0040] Figure 3 This is a schematic diagram of the spiral blade structure of the present invention;

[0041] Figure 4 This is a schematic diagram of the air outlet plate structure of the present invention;

[0042] Figure 5 This is a schematic diagram of the working operation of the air outlet plate of the present invention.

[0043] Reference numerals: 10, First concentration detection device; 20, Second concentration detection device; 101, Outer shell; 102, Inner shell; 1021, Upper mixing section; 1022, Middle mixing section; 1023, Lower mixing section; 1024, Air inlet; 103, Oxygen inlet; 104, Air inlet; 105, First fan; 106, Connecting pipe; 107, Second fan; 201, Mixing chamber; 202, Air outlet plate; 203, Rotating rod; 204, Spiral blade; 205, Drive motor; 206, Air passage hole; 207, Through hole; 208, Secondary oxygen adjustment inlet; 209, Perforated plate; 210, Collection box; 211, Outer track; 212, Drive rod; 213, Folded sealing cloth; 215, Turntable; 221, First magnetic driven plate; 222, First magnetic active plate; 23, Return pipe. Detailed Implementation

[0044] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0045] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] Example 1

[0049] like Figure 1 As shown, the automatic oxygen concentration regulation system for the ventilator in this embodiment includes an oxygen supply module, an air supply module, a gas mixing module, a gas output module, a detection module, and a control module. The control module controls the output volume of the oxygen supply module and the air supply module, and simultaneously controls the mixing of air and oxygen by the gas mixing module, performing positive feedback regulation. The detection module provides negative feedback regulation to the control module by detecting gas elements from the gas output module. The gas mixing module includes an initial mixing unit and a secondary mixing unit. The initial mixing unit is equipped with a first concentration detection device 10, and the secondary mixing unit is equipped with a second concentration detection device 20. The initial mixing unit includes an outer shell 101 and an inner shell 102, and oxygen is formed in the inner shell 102. An air cavity is formed between the outer shell 101 and the inner shell 102. An oxygen inlet 103 is provided at the upper part of the inner shell 102, and an air inlet 104 is provided at the bottom of the outer shell 101. The inner shell 102 includes an upper mixing section 1021, a middle mixing section 1022, and a lower mixing section 1023 connected in sequence. The upper mixing section 1021 is provided with a number of air inlets 1024, which are distributed gradually from top to bottom. The diameter of the upper mixing section 1021 is larger than that of the middle mixing section 1022, and the diameter of the lower mixing section 1023 is larger than that of the upper mixing section 1021. A first fan 105 is provided at the bottom of the air cavity. The lower mixing section 1023 is connected to the secondary mixing unit through a connecting pipe 106. A second fan 107 is provided inside the connecting pipe 106, and a first concentration detection device is provided inside the connecting pipe 106.

[0050] like Figure 2 and Figure 3As shown, the secondary mixing unit includes a mixing chamber 201 and a mixing device disposed within the mixing chamber 201. The mixing device includes an outlet plate 202, a rotating rod 203 disposed within the mixing chamber 201, a spiral blade 204 disposed on the rotating rod 203, and a drive motor 205 connected to the rotating rod 203. The outlet plate 202 is connected to the rotating rod 203. The spiral blade 204 is provided with air passage holes 206, and the outlet plate 202 is provided with several through holes 207. The air passage holes 206 on the spiral blade 204 create turbulence in the gas to facilitate mixing. The size and spacing of the air passage holes 206 on each spiral blade 204 can be set differently, all of which are schemes to improve the mixing effect. They are not shown in the figure here but can be set according to requirements. The outlet plate 202 divides the mixing chamber 201 into an upper chamber and a lower chamber. The lower chamber is connected to the connecting pipe 106, and a secondary oxygen adjustment inlet 208 is provided on the lower chamber.

[0051] like Figure 4 and Figure 5 As shown, the vent plate 202 includes a perforated plate body 209 and a closed structure disposed on the perforated plate body 209. The closed structure is used to adjust the opening of the through hole 207. The closed structure includes a collection box 210 disposed on the perforated plate body 209 and an outer track 211 disposed on the perforated plate body 209. A drive rod 212 is disposed on the perforated plate body 209. One end of the drive rod 212 is slidably disposed in the outer track 211, and the other end is disposed on the drive mechanism. A folded sealing cloth 213 is disposed in the collection box 210, and the other end of the folded sealing cloth 213 is connected to the drive rod 212. The collection box 210 is used to store the folded sealing fabric 213. The collection box 210 is equipped with a tightening device, similar to a spring or other structure, so that the folded sealing fabric 213 automatically returns to its original position when no force is applied. The drive mechanism includes an angle drive motor and a turntable 215 located at the output end of the angle drive motor. A drive rod 212 is mounted on the turntable 215. The angle drive motor drives the turntable 215 to rotate, causing the drive rod 212 to follow, thereby opening the folded sealing fabric 213 and completing the closure of the through hole 207.

[0052] The spiral blade 204, rotating rod 203, and air outlet plate 202 are all non-metallic medical materials. Since the mixed gas contains moisture, metal objects are prone to rusting; therefore, the use of metal objects is avoided. A first magnetic driven plate 221 is provided at the upper end of the rotating rod 203, and a first magnetic driving plate 222 is provided on the drive motor 205. Another improvement of this invention is indirect transmission, which avoids the situation where the transmission component extends into the cavity, making it difficult to guarantee a seal. The first magnetic driven plate 221 can be rotated by the first magnetic driving plate 222. Indirect transmission avoids the sealing process and simplifies installation.

[0053] In this embodiment, oxygen and air are supplied from oxygen inlet 103 and air inlet 104 respectively, according to given parameters. This supply is executed according to the parameter ratio and enters the initial mixing unit for mixing. Under the action of the first fan 105, the air moves through 1024 into the inner shell and reacts with the oxygen. The mixed gas sequentially passes through the upper mixing section 1021, the middle mixing section 1022, and then into the lower mixing section 1023. The change in orifice size ensures that the air and oxygen are fully mixed. The residence time has a certain impact on the mixing effect. The mixed gas awaits detection in the lower mixing section 1023. The mixture is then processed by the second... The blower 107 pumps the mixed gas into the secondary mixing unit. Inside the pipeline, the oxygen concentration in the mixed gas is detected to determine the mixing level. If the mixed gas is within acceptable limits, it passes directly through the outlet plate 202, is mixed by the spiral blades 204, and discharged from the upper outlet. A second concentration detection device 20 is installed at the upper outlet to further check the concentration. If it is within acceptable limits, it can be discharged. If it is not within acceptable limits, it re-enters the secondary mixing unit through the return pipe 23. The reason for the failure is insufficient oxygen concentration, requiring continued oxygen supply through the secondary oxygen inlet 208. After oxygen supply, the mixture is discharged. This completes the oxygen concentration adjustment.

[0054] Example 2

[0055] This embodiment discloses a method for automatically adjusting the oxygen concentration delivered by a ventilator, including the following steps:

[0056] S1. Obtain the required oxygen concentration data; this acquisition includes initial value selection by professionals based on experience and correction based on actual conditions; actual conditions involve adjustments based on different needs, and can be set with reference to existing technologies that adjust concentration based on changes in breathing efficiency. Once the settings are complete, the required output oxygen concentration value is obtained.

[0057] S2. Based on the required oxygen concentration data, construct a primary oxygen regulation model; supply the corresponding amount of oxygen and air according to the required concentration, and mix them in the initial mixing unit; this process involves supplying gas according to the required output oxygen concentration value, feeding the gas into the initial mixing unit. Because the gas may not be mixed evenly or may leak, it is difficult to guarantee that the actual value is the same as the theoretical value.

[0058] S3. Concentration is detected by the first concentration detection device. The first concentration detection device uses concentration detection in different sections. By comparing the concentration data of different sections, it is determined whether the mixture is uniform and whether it meets the actual oxygen concentration requirements.

[0059] S4. Analyze the first test results and perform a negative feedback adjustment;

[0060] S41. Obtain oxygen concentration data for several sections: x1, x2, x3...x i ;

[0061] S42. Perform data homogenization processing: , This is the average oxygen concentration data;

[0062] S43. Determine the relationship between d and K. If d > K, it indicates a large gas concentration difference and uneven mixing, then proceed to step S44. If d < K, it indicates relatively uniform mixing, then proceed to step S44. The relationship between the standard concentration value S and the magnitude of the standard concentration value S, if If the result is less than S, then proceed to step S44. Although the mixture is relatively uniform, the oxygen concentration is insufficient. This could be due to some gas not being mixed properly, a leak, or other reasons. No oxygenation is needed here; we must first consider the possibility of uneven mixing. Therefore, the next step is to continue mixing until the mixture is uniform.

[0063] S44. Stop the second fan 107 and increase the speed of the first fan 105. This increases the fluidity of the mixed gas, increasing the probability of collisions and resulting in more uniform mixing. After mixing for a period of time, restart the second fan 107, allowing the mixed gas to enter the secondary mixing unit through the connecting pipe, and continue with step S41. At this point, the oxygen concentration in the mixed gas is detected, and a judgment is made... The relationship between the size of S and the size of S is determined by... The difference between S and S is used as a parameter for oxygen replenishment in the secondary mixing unit.

[0064] S5. Based on the final test results, construct a two-stage oxygen regulation model; this step involves calculating the required oxygenation level. The required oxygenation level can be obtained based on the current concentration and the desired value.

[0065] S6. Based on oxygen demand, replenish oxygen from the secondary oxygen inlet and perform concentration detection using a second concentration detection device; this step is the incremental oxygen input.

[0066] S7. Analyze the second test results and perform a second negative feedback adjustment; after the theoretical increase in oxygen, it cannot be guaranteed that it will reach the expected value, so it needs to be adjusted again.

[0067] S71. Obtain oxygen concentration data for several sections and obtain the corresponding d-values ​​and... Value; this step is calculated in the same way as step S4.

[0068] S72, if =S, then execute step S8, where S is the standard value, which is also the expected value. The value represents only the average and does not guarantee the complete accuracy of the actual output value. However, the breathing process involves multiple segments of breathing, so this error is negligible. Therefore, when When the concentration is equal to S, the oxygen concentration in the gas is considered to be within acceptable limits. If... If the oxygen concentration is less than S, the mixed gas will be pumped back to the secondary mixing unit from the return pipe. This situation occurs because the oxygen concentration is insufficient. The cause of this situation may be uneven mixing or other reasons, so it is necessary to mix again.

[0069] S73. Calculate the oxygen difference and supplement oxygen through the secondary oxygen inlet. Here, oxygen is supplemented first and then mixed. Of course, the oxygen increment here is increased in small amounts multiple times, which can completely avoid the situation of excessive oxygen concentration.

[0070] S74. Set a standard value A, which is a data setting based on years of experience by medical experts or experts in this field. Compare the d value with A. If d < A, normal operation is maintained, meaning no adjustment is made. Execute according to the original state. If d > A, it indicates uneven mixing, resulting in large errors in different sections. Then, start the angle drive motor to rotate the turntable, which in turn rotates the folded sealing cloth to complete the sealing of the through hole 207. This actually reduces the gas intake to change the intensity of the original turbulence, making the gas mixing more uniform.

[0071] S75. Repeat steps S71-S74, repeatedly check and repeatedly increase the oxygen level.

[0072] S8. Once the final test is passed, the mixed gas can be output. The above description is merely an embodiment of the present invention; common knowledge regarding specific structures and characteristics is not described in detail here. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description, and therefore all changes falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An automatic oxygen concentration regulation system for a ventilator, comprising an oxygen supply module, an air supply module, a gas mixing module, a gas output module, a detection module, and a control module, wherein the control module controls the output volume of the oxygen supply module and the air supply module, and simultaneously controls the mixing of air and oxygen by the gas mixing module, performing positive feedback regulation; the detection module provides negative feedback regulation to the control module by detecting gas elements of the gas output module; the gas mixing module comprises an initial mixing unit and a secondary mixing unit, wherein the initial mixing unit is provided with a first concentration detection device (10), and the secondary mixing unit is provided with a second concentration detection device (20); the initial mixing unit comprises an outer shell (101) and an inner shell (102), wherein an oxygen inlet (103) is provided at the upper part of the inner shell (102), and an air inlet (104) is provided at the bottom of the outer shell (101), characterized in that, An oxygen chamber is formed inside the inner shell (102), and an air chamber is formed between the outer shell (101) and the inner shell (102). The inner shell (102) includes an upper mixing section (1021), a middle mixing section (1022), and a lower mixing section (1023) connected in sequence. The upper mixing section (1021) is provided with a plurality of air inlets (1024), which are distributed gradually from top to bottom. The diameter of the upper mixing section (1021) is larger than that of the middle mixing section (1022), and the diameter of the lower mixing section (1023) is larger than that of the upper mixing section (1021). A first fan (105) is provided at the bottom of the air chamber, and the lower mixing section (1023) is connected to the air chamber via a connecting pipe (106). The secondary mixing unit is connected to the connecting pipe (106), and a second fan (107) is provided inside the connecting pipe (106). The first concentration detection device is provided inside the connecting pipe (106). The secondary mixing unit includes a mixing chamber (201) and a mixing device provided inside the mixing chamber (201). The mixing device includes an air outlet plate (202). The air outlet plate (202) divides the mixing chamber (201) into an upper chamber and a lower chamber. The lower chamber is connected to the connecting pipe (106). A secondary oxygen adjustment inlet (208) is provided on the lower chamber. The air outlet plate (202) includes a perforated plate (209) and a closed structure provided on the perforated plate (209). The closed structure is used to adjust the opening of the through hole (207). In use, given parameters are used to supply oxygen and air into the initial mixing unit through the oxygen inlet (103) and air inlet (104) respectively, where they are mixed. The mixture moves under the action of the first fan (105). Air enters the inner shell through the air inlet (1024) and reacts with oxygen. The mixed gas passes sequentially through the upper mixing section (1021), the middle mixing section (1022), and then into the lower mixing section (1023). The change in orifice size ensures complete mixing of air and oxygen. The mixed gas awaits detection in the lower mixing section (1023) and is then processed by the second fan. The machine (107) pumps gas to pump the mixed gas into the secondary mixing unit. In the pipeline, the first concentration detection device (10) detects the oxygen concentration in the mixed gas passing through the pipeline to obtain the mixed gas level. If the mixed gas is qualified, the mixed gas is directly discharged from the upper outlet through the spiral blade (204) via the gas outlet plate (202). The second concentration detection device (20) detects whether it is qualified. If it is qualified, it is discharged. If it is not qualified, it enters the secondary mixing unit again through the return gas pipe (23) and is supplied with oxygen through the secondary oxygen adjustment inlet (208). After oxygen supply, it is discharged through mixing.

2. The automatic oxygen concentration adjustment system for a ventilator according to claim 1, characterized in that: The mixing device includes a rotating rod (203) disposed in the mixing chamber (201), a spiral blade (204) disposed on the rotating rod (203), and a drive motor (205) connected to the rotating rod (203). The air outlet plate (202) is connected to the rotating rod (203). The spiral blade (204) is provided with an air passage hole (206), and the air outlet plate (202) is provided with a plurality of through holes (207).

3. The automatic oxygen concentration adjustment system for a ventilator according to claim 2, characterized in that: The enclosed structure includes a collection box (210) disposed on a perforated plate (209) and an outer track (211) disposed on the perforated plate (209). A drive rod (212) is disposed on the perforated plate (209). One end of the drive rod (212) is slidably disposed in the outer track (211), and the other end is disposed on the drive mechanism. A folded sealing cloth (213) is disposed inside the collection box (210), and the other end of the folded sealing cloth (213) is connected to the drive rod (212).

4. The automatic oxygen concentration adjustment system for a ventilator according to claim 3, characterized in that: The driving mechanism includes an angle drive motor and a turntable (215) disposed at the output end of the angle drive motor, and the drive rod (212) is disposed on the turntable (215).

5. The automatic oxygen concentration adjustment system for a ventilator according to claim 4, characterized in that: The spiral blade (204), rotating rod (203) and air outlet plate (202) are all non-metallic medical materials. The upper end of the rotating rod (203) is provided with a first magnetic driven piece (221), and the drive motor (205) is provided with a first magnetic active piece (222).

6. A method for automatically adjusting the oxygen concentration in a ventilator based on the automatic oxygen concentration adjustment system for a ventilator according to claim 5, characterized in that, Includes the following steps: S1. Obtain the required oxygen concentration data; this oxygen concentration acquisition includes the initial selection of values ​​by professionals based on experience and corrections based on actual conditions; S2. Based on the required oxygen concentration data, construct a primary oxygen regulation model; S3. Concentration is detected by the first concentration detection device. The first concentration detection device uses concentration detection in different sections. By comparing the concentration data of different sections, it is determined whether the mixture is uniform and whether it meets the actual oxygen concentration requirements. S4. Analyze the first test results and perform a negative feedback adjustment; S5. Based on the final test results, construct a two-stage oxygen regulation model; S6. Based on oxygen demand, replenish oxygen from the secondary oxygen inlet and perform concentration detection using a second concentration detection device; S7. Perform a second test result analysis and a second negative feedback adjustment; S8. The test is qualified, and the mixed gas is output.

7. The method for automatically adjusting the oxygen concentration delivered by a ventilator according to claim 6, characterized in that, The analysis of the first detection result and the subsequent negative feedback adjustment include the following steps: S41. Obtain oxygen concentration data for several sections: x1, x2, x3...x i ; S42. Perform data homogenization processing: ; S43. Determine the relationship between d and K. If d > K, proceed to step S44. If d < K, then determine... The relationship between the standard concentration value S and the magnitude of the standard concentration value S, if If <S, then execute S44; S44. Stop the second fan (107) from working, increase the speed of the first fan (105), mix for a period of time, then start the second fan (107) again, and continue to execute step S41 to determine... The relationship between the size of S and the size of S is determined by... The difference between S and S is used as the parameter for oxygen replenishment in step S6.

8. The method for automatically adjusting the oxygen concentration delivered by a ventilator according to claim 7, characterized in that, The process of analyzing the second detection result and performing secondary negative feedback adjustment includes the following steps: S71. Obtain oxygen concentration data for several sections and obtain the corresponding d-values ​​and... value; S72, if =S, then execute step S8, if If the value is less than S, the mixed gas will continue to be pumped back to the secondary mixing unit from the return pipe. S73. Calculate the oxygen difference and supplement oxygen through the secondary oxygen adjustment inlet; S74. Set a standard value A, compare the value of d with A. If d is less than A, the machine will run normally. If d > A, start the angle drive motor to drive the turntable to rotate, and then drive the folded sealing cloth to complete the sealing of the through hole (207). S75. Repeat steps S71-S74.

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