Oxygen concentration adjusting device

Abstract

The utility model relates to an oxygen concentration adjusting device, which belongs to the technical field of oxygen supply equipment and comprises an air inlet bin, an oxygen mixing bin and a numerical control module which are arranged in an outer shell. The air inlet bin is communicated with the oxygen mixing bin, the air inlet and the oxygen inlet are formed in the air inlet bin, the mixed gas outlet is formed in the oxygen mixing bin, a silent fan is arranged in the oxygen mixing bin, and based on digital control, the air inlet flow can be adjusted through the silent fan and the gas flow controller. And the gas flow or concentration of the air and oxygen inlet and the gas flow or concentration of the mixed gas outlet can be obtained respectively, and the working states of the silent fan and the gas flow controller can be adjusted in time, so that the concentration after the oxygen and the air are mixed can be accurately controlled, and the oxygen outlet concentration is stable.

Description

Technical Field

[0001] The utility model belongs to the technical field of oxygen supply equipment, and in particular relates to an oxygen concentration adjustment device. Background Art

[0002] Existing oxygen supply equipment adjusts the oxygen concentration at the oxygen terminal by controlling the oxygen flow at the oxygen supply end. The change in the oxygen concentration at the oxygen terminal is achieved based on changing the mixing ratio of oxygen and air. The oxygen flow is usually adjustable, while the air flow is greatly affected by the external environment and individual differences, making it impossible to accurately control the concentration of oxygen and air after mixing, which affects the use effect of the oxygen terminal and also causes waste of oxygen. Utility Model Content

[0003] In order to solve the above problems existing in the prior art, the utility model provides an oxygen concentration adjustment device. The technical problem to be solved by the utility model is achieved through the following technical solutions:

[0004] The utility model provides an oxygen concentration adjustment device, comprising: an air intake bin, an oxygen mixing bin and a numerical control module arranged in an outer shell; the air intake bin and the oxygen mixing bin are interconnected, and the numerical control module is arranged adjacent to the air intake bin or the oxygen mixing bin; an air inlet and an oxygen inlet are arranged at intervals on the air intake bin, and a gas flow controller and an oxygen flow and concentration sensor are respectively arranged in the air intake bin; the gas flow controller is connected to the air inlet, and the oxygen flow and concentration sensor is connected to the oxygen inlet; the gas flow controller is used to obtain and control the air intake flow of the air inlet; the oxygen flow and concentration sensor is used to obtain the oxygen intake flow and oxygen intake concentration of the oxygen inlet;

[0005] The mixed gas outlet is arranged on the oxygen mixing chamber, and a silent fan and an oxygen concentration sensor are arranged in the oxygen mixing chamber. The silent fan and the oxygen concentration sensor are arranged close to the mixed gas outlet respectively; the oxygen concentration sensor is used to obtain the oxygen outlet concentration of the mixed gas outlet;

[0006] The numerical control module controls the silent fan and the gas flow controller respectively, and the oxygen flow and concentration sensor and the oxygen concentration sensor are electrically connected to the numerical control module respectively; the numerical control module is used to control the silent fan and the gas flow controller according to the air intake flow, oxygen intake flow, oxygen intake concentration and oxygen outlet concentration.

[0007] In one embodiment of the utility model, a first partition and a second partition are arranged in the oxygen mixing chamber, wherein the first partition is arranged away from the silent fan, and the second partition is arranged close to the silent fan.

[0008] In one embodiment of the present invention, a plurality of air guide holes are evenly arranged on the first partition plate and the second partition plate.

[0009] In one embodiment of the present invention, the size of the air guide holes on the first partition plate is greater than the size of the air guide holes on the second partition plate.

[0010] In one embodiment of the present invention, the oxygen concentration sensor is located between the silent fan and the second partition.

[0011] In one embodiment of the utility model, the silent fan is covered with a drainage and silencer pipe, and a plurality of air intake holes are arranged at intervals outside the drainage and silencer pipe.

[0012] In one embodiment of the present invention, the calculation formula of the oxygen outlet concentration is:

[0013]

[0014] Wherein, C0 is the oxygen outlet concentration; C1 is the oxygen inlet concentration; Q1 is the oxygen inlet flow rate; Q2 is the air inlet flow rate; k is the first coefficient, k=0.21.

[0015] In one embodiment of the present invention, the oxygen concentration adjustment device further includes a display module, which is disposed on the outer shell and electrically connected to the numerical control module for displaying the oxygen outlet concentration.

[0016] In one embodiment of the utility model, a sound-absorbing wall is arranged on the inner side of the outer shell, and the material of the sound-absorbing wall is sound-absorbing cotton.

[0017] In one embodiment of the utility model, the oxygen concentration adjustment device also includes a power supply assembly, which is arranged in an air intake chamber or an oxygen mixing chamber, and the power supply assembly is electrically connected to a gas flow controller, an oxygen flow and concentration sensor, a silent fan, an oxygen concentration sensor, a numerical control module and a display module.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The oxygen concentration adjustment device of the utility model is based on digital control, can adjust the air intake flow rate through a silent fan and a gas flow controller, and can respectively obtain the gas flow rate or concentration of the air and oxygen inlet and the mixed gas outlet, and can timely adjust the working state of the silent fan and the gas flow controller, so as to accurately control the concentration of oxygen and air after mixing, so as to stabilize the oxygen outlet concentration.

[0020] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the external structure of an oxygen concentration adjustment device provided by an embodiment of the utility model;

[0022] Figure 2 It is a schematic diagram of the internal (partial) structure of an oxygen concentration adjustment device provided by an embodiment of the utility model;

[0023] Figure 3 It is a schematic diagram of the structure of the partition provided by the embodiment of the utility model;

[0024] Figure 4 It is a schematic diagram of the structure of the drainage silencer pipe and the silencer wall provided in the embodiment of the utility model;

[0025] Figure 5 is a schematic diagram of a display assembly provided by an embodiment of the utility model;

[0026] Figure 6 This is a working flow chart of an oxygen concentration adjustment device provided in an embodiment of the utility model.

[0027] Icons: 100-air inlet chamber; 110-air inlet; 120-oxygen inlet; 130-gas flow controller; 140-oxygen flow and concentration sensor; 200-oxygen mixing chamber; 210-mixed gas outlet; 220-silent fan; 230-oxygen concentration sensor; 240-first partition; 250-second partition; 260-drainage silencer; 300-CNC module; 400-display module; 500-silencer wall; 600-power supply assembly. DETAILED DESCRIPTION

[0028] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the present invention, an oxygen concentration adjustment device proposed according to the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] The above and other technical contents, features and effects of the utility model are clearly presented in the following detailed description of the specific implementation mode in conjunction with the accompanying drawings. Through the description of the specific implementation mode, the technical means and effects adopted by the utility model to achieve the predetermined purpose can be more deeply and specifically understood. However, the attached drawings are only for reference and explanation, and are not used to limit the technical solution of the utility model.

[0030] Embodiment 1

[0031] like Figure 1 and Figure 2 As shown, the utility model provides an oxygen concentration adjustment device, comprising: an air intake chamber 100, an oxygen mixing chamber 200 and a numerical control module 300 arranged in an outer shell; the air intake chamber 100 and the oxygen mixing chamber 200 are interconnected, the air intake chamber 100 is used for air intake and oxygen intake, and the oxygen mixing chamber 200 is used for mixing air and oxygen. The air inlet 110 and the oxygen inlet 120 are arranged on the air intake chamber 100 at intervals, the air inlet 110 is connected to an external oxygen source, the mixed gas outlet 210 is arranged on the oxygen mixing chamber 200, and a silent fan 220 is arranged in the oxygen mixing chamber 200, and the silent fan 220 is used to mix oxygen with air and send out the mixed gas. The numerical control module 300 is arranged adjacent to the air intake chamber 100 or the oxygen mixing chamber 200, and the numerical control module 300 can control the silent fan 220 and adjust its working power.

[0032] Optionally, the outer shell can be made of resin or engineering plastic material, and its outer contour can be a cube.

[0033] Preferably, the operating voltage of the silent fan 220 may be 5V, the rated operating current may be 0.12A, the noise level in the operating state may be ≤32.8dB, and the operating speed and operating power may be adjustable, and the operating speed range may be 4000±10%r / min.

[0034] In an optional embodiment, the outlet side of the silent fan 220 is arranged opposite to the inlet side, and the outlet side is connected to the first side of the mixed gas outlet 210. The second side of the mixed gas outlet 210 is connected to the oxygen terminal through a variable diameter oxygen supply pipe. The variable diameter oxygen supply pipe can be made of plastic material or mostly of plastic material, with a diameter of 50 mm and a length of 20 cm to 200 cm, and can be adapted according to the connection size of the oxygen terminal.

[0035] The principle is that the oxygen inlet 120 inputs oxygen into the air intake chamber 100 through a connected external oxygen generator or other oxygen source to achieve oxygen intake. The common oxygen intake concentration is 93% or 99.5%. Due to the different oxygen concentration requirements of the oxygen-using terminals, after the oxygen is taken in, it needs to be mixed with air in the oxygen mixing chamber 200 to obtain a mixed gas of oxygen and air of appropriate concentration.

[0036] Air intake is achieved through the air inlet 110. Since the air intake chamber 100 and the oxygen mixing chamber 200 are interconnected, oxygen and air can enter the oxygen mixing chamber 200 from the air intake chamber 100, and driven by the silent fan 220 disposed in the oxygen mixing chamber 200, the air enters the air intake chamber 100 from the air inlet 110. Furthermore, the numerical control module 300 can change the air intake flow rate entering from the air inlet 110 by adjusting the working power of the silent fan 220, thereby changing the intake flow rate ratio of air and oxygen, that is, accurately controlling the concentration of oxygen and air after mixing, so that the oxygen outlet concentration remains stable.

[0037] like Figure 2 As shown, in order to further ensure the concentration of oxygen after mixing with air, a gas flow controller 130 and an oxygen flow and concentration sensor 140 are respectively provided in the air inlet chamber 100, and an oxygen concentration sensor 230 is provided in the oxygen mixing chamber 200, that is, the gas flow controller 130, the oxygen flow and concentration sensor 140 and the oxygen concentration sensor 230 correspond to the air inlet 110, the oxygen inlet 120 and the mixed gas outlet 210, respectively.

[0038] Specifically, the gas flow controller 130 is connected to the air inlet 110, and the oxygen flow and concentration sensor 140 is connected to the oxygen inlet 120; the gas flow controller 130 is used to obtain and control the air intake flow of the air inlet 110; the oxygen flow and concentration sensor 140 is used to obtain the oxygen intake flow and oxygen intake concentration of the oxygen inlet 120; the oxygen concentration sensor 230 is arranged near the mixed gas outlet 210, specifically, the oxygen concentration sensor 230 is arranged near the air intake side of the silent fan 220, and is used to obtain the oxygen outlet concentration of the mixed gas outlet 210.

[0039] It should be noted that the interior of the air intake chamber 100 and the oxygen mixing chamber 200 are sealed relative to the outside (except for the air inlet 110, the oxygen inlet 120 and the mixed gas outlet 210), so that the external air can be inhaled through the negative pressure formed by the silent fan 220, and the data obtained by each sensor is more accurate.

[0040] In an optional embodiment, a solenoid valve and a gas flow sensor are provided in a gas flow controller (Mass Flow Controller, MFC) 130, and air enters through the air inlet 110. The air intake flow rate is adjusted by adjusting the opening and closing degree of the solenoid valve, and the gas flow sensor can obtain the air intake flow rate.

[0041] like Figure 2 and Figure 3 As shown, in order to evenly mix oxygen and air, a first partition 240 and a second partition 250 are arranged in the oxygen mixing chamber 200, wherein the first partition 240 is arranged away from the silent fan 220, and the second partition 250 is arranged close to the silent fan 220. Specifically, a plurality of air guide holes are evenly arranged on the first partition 240 and the second partition 250, and the size of the air guide holes on the first partition 240 is larger than the size of the air guide holes on the second partition 250.

[0042] In an optional embodiment, the oxygen concentration sensor 230 is located between the silent fan 220 and the second partition plate 250 .

[0043] Further, if Figure 2 As shown, the numerical control module 300 controls the silent fan 220 and the gas flow controller 130 respectively, and the oxygen flow and concentration sensor 140 and the oxygen concentration sensor 230 are electrically connected to the numerical control module 300 respectively, that is, the numerical control module 300 is used to control the silent fan 220 and the gas flow controller 130 according to the air intake flow, oxygen intake flow, oxygen intake concentration and oxygen outlet concentration, so as to make the adjustment of the air intake flow more accurate.

[0044] Preferably, the numerical control module 300 may adopt a STM32F103C8T6 single chip microcomputer, whose operating voltage may be 3.3V and operating power may be 0.1 to 0.2W.

[0045] In an optional embodiment, the oxygen concentration adjustment device further includes a power supply assembly 600, and the power supply assembly 600 is disposed in the air intake chamber 100 or the oxygen mixing chamber 200. Figure 2 As shown, the power supply assembly 600 is disposed in the air intake chamber 100 .

[0046] Specifically, the power supply component 600 is electrically connected to the gas flow controller 130, the oxygen flow and concentration sensor 140, the silent fan 220, the oxygen concentration sensor 230, and the numerical control module 300, respectively. That is, the gas flow controller 130, the oxygen flow and concentration sensor 140, the silent fan 220, the oxygen concentration sensor 230, and the numerical control module 300 are powered by the power supply component 600.

[0047] Preferably, the power supply assembly 600 may be a rechargeable battery with a capacity of 20,000 mAh and a charging time of 8 to 10 hours, which can theoretically allow the oxygen concentration regulating device to operate for 120 to 150 hours.

[0048] Common oxygen intake concentrations are 93% or 99.5%, and oxygen outlet concentrations are 30% to 99.5%. Correspondingly, when the oxygen intake concentration is 93%, the oxygen outlet concentration is 30% to 93%, and when the oxygen intake concentration is 99.5%, the oxygen outlet concentration is 30% to 99.5%, that is, the highest oxygen outlet concentration needs to be set according to the oxygen intake concentration and cannot exceed the maximum value of the oxygen intake concentration. However, the oxygen intake concentration can be set according to the use needs of the oxygen terminal within a range lower than the maximum value of the oxygen intake concentration.

[0049] The principle of changing the oxygen outlet concentration by adjusting the air intake flow rate is:

[0050] The calculation formula for oxygen outlet concentration is:

[0051]

[0052] Wherein, C0 is the oxygen outlet concentration; C1 is the oxygen inlet concentration; Q1 is the oxygen inlet flow rate; Q2 is the air inlet flow rate; k is the first coefficient, k=0.21.

[0053] For example, the oxygen outlet flow rate is set to 10 L / min, and the oxygen outlet concentrations are 99.5% and 93.5% respectively. Formula (1) is used for calculation to obtain the relationship between the oxygen outlet concentration and the required air intake flow rate. In the case of other oxygen outlet flow rates or oxygen outlet concentrations, the calculation method is no different.

[0054] It should be noted that after the required oxygen outlet concentration is set, the numerical control module 300 can automatically calculate the required air intake flow rate based on the obtained air intake flow rate, oxygen intake flow rate, oxygen intake concentration and oxygen outlet concentration, and correspondingly control the working state of the gas flow controller 130 and the silent fan 220 to change the air intake flow rate. Specifically, by adjusting the opening and closing degree of the electromagnetic valve of the gas flow controller 130 and controlling the working power of the silent fan 220, the change in the working power of the silent fan 220 is also correspondingly manifested as a change in its working speed.

[0055] Table 1 Comparison table of oxygen outlet concentration and required air inlet flow rate

[0056]

[0057] like Figure 1 and Figure 5As shown, in an optional embodiment, the oxygen concentration adjustment device further includes a display module 400, which is disposed on the outer shell and has buttons and a display area thereon for displaying the oxygen outlet concentration.

[0058] In an optional embodiment, the numerical control module 300 is disposed above the air intake chamber 100 and the oxygen mixing chamber 200, and is disposed in the outer shell; the display module 400 is disposed on the numerical control module 300, and the display module 400 is at least partially exposed from the outer shell for easy observation and operation.

[0059] Specifically, the display module 400 is electrically connected to the power supply assembly 600 and the numerical control module 300, that is, the display module 400 is powered by the power supply assembly 600, and the oxygen outlet concentration is read by the numerical control module 300 and displayed on the display module 400. Similarly, the oxygen intake flow rate and oxygen intake concentration can also be read by the numerical control module 300 and displayed on the display module 400.

[0060] In addition, the display module 400 can also input parameters. For example, the required oxygen outlet concentration is set through the display module 400, and the required air intake flow is calculated and automatically controlled through the numerical control module 300. Setting parameter display data through the display module 400 can make the use of the numerical control module 300 more flexible, and at the same time, the visualization of the oxygen concentration adjustment device can be realized.

[0061] Optional, such as Figure 5 As shown, the display module 400 can also display the air intake flow rate or the oxygen intake flow rate or the oxygen intake concentration, and can also be provided with a concentration setting adjustment button and a start-stop button.

[0062] like Figure 4 As shown, in an optional embodiment, in order to reduce the working noise of the silent fan 220, a drainage muffler 260 is coated outside the silent fan 220 for silencing and vibration reduction. Preferably, the wall thickness of the drainage muffler 260 can be 2 mm, and a plurality of air ducting holes are arranged outside the drainage muffler 260 at intervals to guide the mixed gas to make the gas more uniform.

[0063] Furthermore, a sound-absorbing wall 500 is provided on the inner side of the outer shell. The material of the sound-absorbing wall 500 may be sound-absorbing cotton, which can effectively absorb and reduce noise.

[0064] It should be noted that, in order to ensure the heat dissipation capability of the power supply assembly 600 , the location near the power supply assembly 600 is not covered by the silencer wall 500 .

[0065] The working principle of the oxygen concentration adjustment device of this embodiment is as follows: Figure 6As shown, the oxygen outlet concentration is set on the display module 400, the numerical control module 300 obtains the oxygen intake flow rate and the oxygen intake concentration through the oxygen flow rate and concentration sensor 140, and calculates the required air intake flow rate, and the numerical control module 300 controls the gas flow controller 130 and the silent fan 220 according to the required air intake flow rate, thereby controlling the air intake flow rate.

[0066] When the oxygen outlet concentration is set to 99.5% or 93% (corresponding to the oxygen source concentration), air intake is not required; when the oxygen outlet concentration is set to 30% to 80%, the air intake flow rate needs to be controlled. Specifically, air enters the air intake bin 100 through the air inlet 110, and oxygen enters the air intake bin 100 through the oxygen inlet 120. The oxygen and air are mixed in the oxygen mixing bin 200 and discharged from the mixed gas outlet 210.

[0067] At the beginning of air intake, due to the high oxygen concentration and the low air flow rate, the oxygen outlet concentration is high. The oxygen concentration sensor 230 arranged near the mixed gas outlet 210 detects the oxygen concentration in real time and transmits it to the numerical control module 300. In the numerical control module 300, the oxygen concentration obtained by real-time detection and the set oxygen outlet concentration are compared in real time. If the real-time detected oxygen concentration is less than the set oxygen outlet concentration, the working power of the silent fan 220 is continued to be increased or the opening and closing degree of the electromagnetic valve of the gas flow controller 130 is increased. If the real-time detected oxygen concentration is greater than the set oxygen outlet concentration, the working power of the silent fan 220 is controlled to be constant, and the opening and closing degree of the electromagnetic valve of the gas flow controller 130 is maintained, and the oxygen outlet concentration is waited to be stable. If the oxygen outlet concentration still does not reach the set oxygen outlet concentration after stabilization, similar adjustments are made until the oxygen outlet concentration stabilizes at the set oxygen outlet concentration.

[0068] The oxygen concentration adjustment device of the utility model is based on digital control, can adjust the air intake flow rate through a silent fan and a gas flow controller, and can respectively obtain the gas flow rate or concentration of the air and oxygen inlet and the mixed gas outlet, and can timely adjust the working state of the silent fan and the gas flow controller, so as to accurately control the concentration of oxygen and air after mixing, so as to stabilize the oxygen outlet concentration.

[0069] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant is intended to cover non-exclusive inclusion, so that the article or device including a series of elements includes not only those elements, but also other elements that are not explicitly listed. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or device including the elements. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The orientation or position relationship indicated by "up", "down", "left", "right", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the utility model.

[0070] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An oxygen concentration adjustment device, characterized in that: include: An air intake chamber (100), an oxygen mixing chamber (200) and a numerical control module (300) are arranged in the outer shell; The air intake chamber (100) and the oxygen mixing chamber (200) are in communication with each other, and the numerical control module (300) is disposed adjacent to the air intake chamber (100) or the oxygen mixing chamber (200); The air inlet (110) and the oxygen inlet (120) are arranged at intervals on the air inlet bin (100), and a gas flow controller (130) and an oxygen flow and concentration sensor (140) are respectively arranged in the air inlet bin (100); the gas flow controller (130) is connected to the air inlet (110), and the oxygen flow and concentration sensor (140) is connected to the oxygen inlet (120); the gas flow controller (130) is used to obtain and control the air intake flow of the air inlet (110); the oxygen flow and concentration sensor (140) is used to obtain the oxygen intake flow and oxygen intake concentration of the oxygen inlet (120); The mixed gas outlet (210) is arranged on the oxygen mixing chamber (200), and a silent fan (220) and an oxygen concentration sensor (230) are arranged in the oxygen mixing chamber (200), and the silent fan (220) and the oxygen concentration sensor (230) are respectively arranged close to the mixed gas outlet (210); the oxygen concentration sensor (230) is used to obtain the oxygen outlet concentration of the mixed gas outlet (210); The numerical control module (300) controls and connects the silent fan (220) and the gas flow controller (130) respectively, and the oxygen flow and concentration sensor (140) and the oxygen concentration sensor (230) are electrically connected to the numerical control module (300) respectively; the numerical control module (300) is used to control the silent fan (220) and the gas flow controller (130) according to the air intake flow, the oxygen intake flow, the oxygen intake concentration and the oxygen outlet concentration.

2. The oxygen concentration adjustment device according to claim 1, characterized in that: A first partition (240) and a second partition (250) are arranged in the oxygen mixing chamber (200), wherein the first partition (240) is arranged away from the silent fan (220), and the second partition (250) is arranged close to the silent fan (220).

3. The oxygen concentration adjustment device according to claim 2, characterized in that: A plurality of air guide holes are evenly arranged on the first partition plate (240) and the second partition plate (250).

4. The oxygen concentration adjustment device according to claim 3, characterized in that: The size of the air guide holes on the first partition plate (240) is greater than the size of the air guide holes on the second partition plate (250).

5. The oxygen concentration adjustment device according to claim 2, characterized in that: The oxygen concentration sensor (230) is located between the silent fan (220) and the second partition plate (250).

6. The oxygen concentration adjustment device according to claim 1, characterized in that: The silent fan (220) is coated with a drainage silencer pipe (260), and a plurality of air intake holes are arranged at intervals outside the drainage silencer pipe (260).

7. The oxygen concentration adjustment device according to claim 1, characterized in that: The calculation formula of the oxygen outlet concentration is: Wherein, C0 is the oxygen outlet concentration; C1 is the oxygen inlet concentration; Q1 is the oxygen inlet flow rate; Q2 is the air inlet flow rate; k is the first coefficient, k=0.

21.

8. The oxygen concentration adjustment device according to claim 1, characterized in that: It also includes a display module (400), which is arranged on the outer shell and electrically connected to the numerical control module (300) and is used to display the oxygen outlet concentration.

9. The oxygen concentration adjustment device according to claim 1, characterized in that: A sound-absorbing wall surface (500) is arranged on the inner side of the outer shell, and the material of the sound-absorbing wall surface (500) is sound-absorbing cotton.

10. The oxygen concentration adjustment device according to claim 8, characterized in that: The invention also comprises a power supply component (600), wherein the power supply component (600) is arranged in the air intake chamber (100) or the oxygen mixing chamber (200), and the power supply component (600) is respectively electrically connected to the gas flow controller (130), the oxygen flow and concentration sensor (140), the silent fan (220), the oxygen concentration sensor (230), the numerical control module (300) and the display module (400).

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