Low-flow oxygen supply simple device capable of adjusting oxygen concentration

Abstract

The utility model discloses a low flow oxygen supply simple device with adjustable oxygen concentration, which comprises a control host and an oxygen supply device, the oxygen supply device is connected with a first air supply pipe, the first air supply pipe comprises a first thick part and a first thin part, and the first thick part and the first thin part are respectively connected with a first pressure sensor and a second pressure sensor. The control host obtains the oxygen flow in the first air supply pipeline according to oxygen pressure values measured by the first pressure sensor and the second pressure sensor; the control host controls the oxygen supply flow of the oxygen supply device to be increased or decreased according to an oxygen demand concentration signal conveyed by the oxygen using end and an oxygen flow signal in the first air supply pipeline. According to the low-flow oxygen supply simple device capable of adjusting the oxygen concentration, the oxygen flow in the first air supply pipeline connected with the oxygen supply device is controlled through the oxygen demand concentration signal, so that the oxygen flow is controlled, namely, the oxygen concentration is controlled, and the oxygen concentration is synchronously controlled during low-flow oxygen supply.

Description

Technical Field

[0001] This utility model relates to the field of medical oxygen supply technology, and in particular to a simple low-flow oxygen supply device with adjustable oxygen concentration. Background Technology

[0002] Oxygen supply devices are commonly used in medical procedures, and with technological advancements, they are also being applied in home healthcare. Low-flow oxygen therapy is primarily used to provide oxygen to patients who require supplemental oxygen but not high-flow oxygen support. Its main functions include increasing blood oxygen levels and arterial oxygen saturation to correct hypoxia. It is suitable for patients with chronic lung diseases, such as COPD, and other patients requiring low-flow oxygen, such as lung cancer patients. Lightweight, portable oxygen supply devices can improve patients' quality of life, enabling them to perform daily activities such as seeing a doctor, going to restaurants, and shopping. These devices can also reduce problems that can arise from high concentrations of oxygen, such as oxygen toxicity, hypercapnia, and respiratory acidosis.

[0003] In the existing technology, the oxygen supply device has a relatively complex structure, and it is difficult to adjust the oxygen concentration at the same time when adjusting the gas supply flow rate, which cannot meet the oxygen supply needs of some occasions. Utility Model Content

[0004] In order to overcome at least one of the defects of the prior art, the present invention provides a simple low-flow oxygen supply device with adjustable oxygen concentration. The oxygen flow rate in the first gas delivery pipe connected to the oxygen supply device is controlled by the oxygen demand concentration signal, thereby realizing oxygen flow rate control, i.e., oxygen concentration control, i.e., realizing simultaneous oxygen concentration control during low-flow oxygen supply.

[0005] The technical solution adopted by this utility model to solve its problem is:

[0006] A simple low-flow oxygen supply device with adjustable oxygen concentration includes a control host, an oxygen supply device, an air supply device, and a mixing device. The mixing device is connected to the oxygen-consuming end and supplies the oxygen-air mixture to the oxygen-consuming end. The oxygen-consuming end is signal-connected to the control host and supplies the required oxygen concentration signal to the control host.

[0007] The oxygen supply device is connected to a first gas supply pipe at its oxygen outlet, and the first gas supply pipe is connected to and in communication with the mixing device.

[0008] A second air supply pipe is connected to the air outlet of the air supply device, and the second air supply pipe is connected to and in communication with the mixing device.

[0009] The first gas delivery pipe includes a first thick section and a first thin section. A first pressure sensor and a second pressure sensor are respectively connected to the first thick section and the first thin section. Both the first pressure sensor and the second pressure sensor are connected to the control host. The control host obtains the oxygen flow rate in the first gas delivery pipe based on the oxygen pressure values ​​measured by the first pressure sensor and the second pressure sensor. The control host controls the oxygen supply device to increase or decrease the oxygen delivery flow rate based on the oxygen demand concentration signal delivered by the oxygen-consuming end and the oxygen flow rate signal in the first gas delivery pipe.

[0010] Furthermore, the second air delivery pipe includes a second thick section and a second thin section. A third pressure sensor and a fourth pressure sensor are respectively connected to the second thick section and the second thin section. Both the third pressure sensor and the fourth pressure sensor are signal-connected to the control host. The control host obtains the air flow rate in the second air delivery pipe based on the air pressure values ​​measured by the third pressure sensor and the fourth pressure sensor. The control host controls the air supply device to increase or decrease the air flow rate based on the oxygen demand concentration signal delivered by the oxygen-consuming end and the air flow rate signal in the second air delivery pipe.

[0011] Furthermore, the first air supply pipe is equipped with a first flow control valve and a first air pump, both of which are signal-connected to the control host.

[0012] Furthermore, the second air supply pipe is equipped with a second flow control valve and a second air pump, both of which are signal connected to the control host.

[0013] Furthermore: a third gas delivery pipe is provided at the outlet of the mixed gas of the mixing device, and a gas flow meter and a first oxygen concentration sensor are connected to the third gas delivery pipe. Both the gas flow meter and the first oxygen concentration sensor are signal connected to the control host. The control host is provided with a display screen, which displays the oxygen concentration in the third gas delivery pipe measured by the first oxygen concentration sensor.

[0014] Further: The mixing device includes a humidifying bottle, the first air supply pipe and the second air supply pipe are both connected to the humidifying bottle and their openings extend below the liquid surface of the humidifying liquid, a fourth air supply pipe is connected to the humidifying bottle, the inner end of the fourth air supply pipe is located above the liquid surface of the humidifying liquid, and the fourth air supply pipe delivers mixed gas to the oxygen-consuming end.

[0015] Furthermore, the humidifier bottle is connected to a liquid replenishment tube, and a heating component is installed inside the humidifier bottle.

[0016] Furthermore: a gas storage bottle is connected to the rear of the humidifier bottle, and the end of the fourth gas delivery pipe away from the humidifier bottle is connected to and in communication with the gas storage bottle;

[0017] The gas storage cylinder is equipped with a gas distribution mesh plate, and the fourth gas delivery pipe extends into the gas storage cylinder and is placed below the gas distribution mesh plate.

[0018] The third gas supply pipe is connected to and conducts through the gas storage cylinder, and the connection end of the third gas supply pipe to the gas storage cylinder is located above the gas distribution mesh plate.

[0019] Furthermore: the gas storage cylinder is also provided with an exhaust port, the exhaust port is provided with a shut-off valve, and the exhaust port is located above the gas distribution mesh plate;

[0020] The gas storage cylinder is equipped with a temperature and humidity sensor and a second oxygen concentration sensor, both of which are connected to the control host.

[0021] Furthermore: the third air supply pipe is equipped with a third flow control valve.

[0022] In summary, the simple low-flow oxygen supply device with adjustable oxygen concentration provided by this utility model has the following technical effects:

[0023] 1. The control host controls the oxygen supply flow rate of the oxygen supply device to increase or decrease based on the oxygen demand concentration signal transmitted from the oxygen-consuming end and the oxygen flow rate signal in the first gas supply pipeline, thereby controlling the oxygen concentration while controlling the mixed gas flow rate, and achieving low flow rate and high oxygen concentration oxygen supply.

[0024] 2. The first air delivery pipe includes a first thick section and a first thin section. A first pressure sensor and a second pressure sensor are respectively connected to the first thick section and the first thin section. The oxygen flow rate in the first air delivery pipe is calculated and obtained by using the pressure values ​​of the first pressure sensor and the second pressure sensor. The oxygen flow rate is accurately obtained and the feedback is rapid.

[0025] 3. The first gas delivery pipe is equipped with a first flow control valve and a first air pump. The oxygen flow is regulated by both the flow control valve and the air pump, which provides a fast response and precise adjustment. Attached Figure Description

[0026] Figure 1 This is a schematic diagram illustrating the working principle of a simple low-flow oxygen supply device with adjustable oxygen concentration according to this utility model.

[0027] Figure 2 This is a schematic diagram of one embodiment of a simple low-flow oxygen supply device with adjustable oxygen concentration according to the present invention.

[0028] The meanings of the reference numerals in the attached figures are as follows:

[0029] 1. Oxygen supply device; 2. First gas supply pipe; 21. First thick section; 22. First thin section; 23. First pressure sensor; 24. Second pressure sensor; 25. First flow control valve; 26. First air pump; 3. Second gas supply pipe; 31. Second thick section; 32. Second thin section; 33. Third pressure sensor; 34. Fourth pressure sensor; 35. Second flow control valve; 36. Second air pump; 4. Humidifier bottle; 41. Heating assembly; 42. Liquid replenishment pipe; 5. Fourth gas supply pipe; 6. Third gas supply pipe; 61. Third flow control valve; 62. First oxygen concentration sensor; 63. Gas flow meter; 7. Gas storage cylinder; 71. Gas distribution mesh plate; 72. Exhaust port; 73. Shut-off valve; 74. Temperature and humidity sensor; 75. Second oxygen concentration sensor; 8. Oxygen consumption end; 9. Battery; 10. Control host; 20. Box body. Detailed Implementation

[0030] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0031] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 utility model.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0033] See Figure 1 and Figure 2 This utility model discloses a simple low-flow oxygen supply device with adjustable oxygen concentration.

[0034] A simple low-flow oxygen supply device with adjustable oxygen concentration includes a control unit 10, an oxygen supply device 1, an air supply device, and a mixing device. The mixing device is connected to the oxygen-consuming end 8 and supplies a mixture of oxygen and air to the oxygen-consuming end 8. The oxygen-consuming end 8 is signal-connected to the control unit 10 and supplies a signal indicating the required oxygen concentration to the control unit 10.

[0035] The oxygen supply device 1 is connected to a first gas delivery pipe 2 at its oxygen outlet, and the first gas delivery pipe 2 is connected to and in communication with the mixing device.

[0036] The air outlet of the air supply device is connected to a second air supply pipe 3, which is connected to and in communication with the mixing device.

[0037] The first air supply pipe 2 includes a first thick section 21 and a first thin section 22. A first pressure sensor 23 and a second pressure sensor 24 are respectively connected to the first thick section 21 and the first thin section 22. Both the first pressure sensor 23 and the second pressure sensor 24 are connected to the control host 10. The control host 10 obtains the oxygen flow rate in the first air supply pipe 2 based on the oxygen pressure values ​​measured by the first pressure sensor 23 and the second pressure sensor 24. The control host 10 controls the oxygen supply device 1 to increase or decrease the oxygen supply flow rate based on the oxygen demand concentration signal delivered by the oxygen-consuming end and the oxygen flow rate signal in the first air supply pipe 2.

[0038] This oxygen supply device is a low-flow oxygen supply device with adjustable oxygen concentration. That is, in most cases, its output mixed gas flow rate is relatively small. Of course, it can also achieve a larger flow rate of oxygen supply.

[0039] In the above scheme, since the gas mixture mainly consists of air and oxygen, and normal air also contains some oxygen, the oxygen supply device 1 is used to supplement the air with some oxygen. Therefore, the oxygen concentration in the gas mixture is relatively low, and the oxygen flow rate output by the oxygen supply device 1 is usually quite small. That is, the above scheme implicitly discloses that the control host 10 controls the air supply device to output air based on the required gas mixture flow rate (Qmixed). At this time, the air flow rate (Qair) output by the air supply device is the required gas mixture flow rate (Qmixed) minus the oxygen flow rate (Qoxygen) to be output by the oxygen supply device 1. Therefore, the control host 10 synchronously controls the oxygen supply device 1 to output the required oxygen concentration.

[0040] Therefore, the simple low-flow oxygen supply device with adjustable oxygen concentration in this technical solution can adjust the oxygen concentration while adjusting the flow rate, thus satisfying both low-flow oxygen supply and low-flow high-oxygen-concentration oxygen supply, and meeting the oxygen supply needs of some special occasions.

[0041] In the above scheme, by setting a first thick part 21 and a first thin part 22 in the first air supply pipe 2, a first pressure sensor 23 and a second pressure sensor 24 are respectively connected to the first thick part 21 and the first thin part 22. The oxygen flow rate in the first air supply pipe 2 is calculated and obtained by using the pressure values ​​of the first pressure sensor 23 and the second pressure sensor 24. The oxygen flow rate is accurately obtained and the feedback is rapid.

[0042] The formula for calculating the oxygen flow rate (Q_oxygen) in the first air supply pipe 2 based on the pressure values ​​fed back by the first pressure sensor 23 and the second pressure sensor 24 is as follows:

[0043]

[0044] In the above formula, Q1 represents oxygen, A2 is the cross-sectional area of ​​the first fine part 22, P1 is the oxygen pressure value of the first thick part 21, P2 is the oxygen pressure value of the first fine part 22, and ρ1 is the density of oxygen. Generally, at room temperature (20℃, 293.15K) and standard atmospheric pressure, the density of oxygen is approximately 1.429 kg / m³. 3 .

[0045] Therefore, it can be seen that the oxygen concentration obtained by measuring the oxygen pressure in the first gas supply pipe 2 is simple to calculate and the oxygen concentration is accurately obtained.

[0046] The first air supply pipe 2 mentioned above includes a first thick part 21 and a first thin part 22, that is, the first air supply pipe 2 is a Venturi tube or a Venturi-like tube, and its working principle is the same as that of a Venturi tube. The oxygen pressure test in the first air supply pipe 2 is the same as that of a Venturi tube.

[0047] In the above scheme, the oxygen supply device 1 can generally be an oxygen generator, a high-pressure gas cylinder 7, a high-pressure oxygen storage tank, etc., which can deliver pure oxygen or high-concentration oxygen to the outside through the first gas delivery pipe 2. The content of other gases in the oxygen can be ignored.

[0048] In the above solution, the air supply device can generally be a compressor, a blower, or an air purifier. Air is supplied externally through the second air supply pipe 3. This air supply device typically includes a filter and a disinfection device to filter and disinfect the air, removing dust and moisture, and sterilizing it. This ensures that the air supplied through the second air supply pipe 3 is clean and can be directly supplied to the oxygen-generating location without causing infection to the person using the oxygen. The air supply device can be a compressor, blower, or air purifier with filtration and disinfection functions found in existing technology. The end of the second air supply pipe 3 furthest from the mixing device is connected to the air outlet of the air supply device.

[0049] In the above technical solution, the control host 10 also adopts existing equipment, which can generally be an LPC controller or a microcontroller unit (MCU). During its operation, it is mainly used to receive signals from various sensors, compare and judge the high and low levels of the signal information, and perform simple calculations on the signal information. In the field of existing controllers, it does not require creative labor for those skilled in the art and belongs to conventional and existing technologies. Therefore, the control host 10 does not involve creative improvements to the software and belongs to existing technologies.

[0050] In this technical solution, the second air supply pipe 3 includes a second thick section 31 and a second thin section 32. A third pressure sensor 33 and a fourth pressure sensor 34 are respectively connected to the second thick section 31 and the second thin section 32. Both the third pressure sensor 33 and the fourth pressure sensor 34 are signal-connected to the control host 10. The control host 10 obtains the air flow rate within the second air supply pipe 3 based on the air pressure values ​​measured by the third pressure sensor 33 and the fourth pressure sensor 34. The control host 10 controls the air supply device to increase or decrease the air flow rate based on the oxygen demand concentration signal delivered from the oxygen-consuming end and the air flow rate signal within the second air supply pipe 3.

[0051] Similarly, the second air supply pipe 3 is also a Venturi tube or a Venturi-like tube, and its working principle is the same as that of a Venturi tube. The air pressure test in the second air supply pipe 3 is the same as that of a Venturi tube.

[0052] The formula for calculating the air flow rate (Q_air) in the second air supply pipe 3 based on the pressure values ​​fed back by the third pressure sensor 33 and the fourth pressure sensor 34 is as follows:

[0053]

[0054] In the above formula, Q2 represents Q_air, A4 is the cross-sectional area of ​​the second detailed part 32, P3 is the air pressure value of the second coarse part 31, P4 is the air pressure value of the second detailed part 32, and ρ2 is the density of air. Generally, at room temperature (20℃, 293.15K) and standard atmospheric pressure, the density of air is approximately 1.2 kg / m³. 3 .

[0055] In the above scheme, the air flow rate in the second air supply pipe 3 can be controlled by the control host 10. By controlling the air flow rate in the second air supply pipe 3, the flow rate of the mixed gas can be controlled. Simultaneously, combined with the control of the oxygen flow rate, the oxygen concentration in the mixed gas can be adjusted. That is, in this scheme, there are multiple ways to adjust the oxygen concentration in the mixed gas. Based on the required oxygen concentration and flow rate, different oxygen concentrations and different mixed gas flow rates can be adjusted, increasing the range of adjustable flow rate and concentration of the mixed gas, and increasing the means of adjusting the concentration and flow rate of the mixed gas.

[0056] In this technical solution, the first air supply pipe 2 is equipped with a first flow control valve 25 and a first air pump 26, both of which are signal-connected to the control host 10. The oxygen flow rate in the first air supply pipe 2 can be adjusted by regulating either the first flow control valve 25 or the first air pump 26. Alternatively, both the first flow control valve 25 and the first air pump 26 can be adjusted simultaneously to regulate the oxygen flow rate in the first air supply pipe 2.

[0057] Generally, adjusting the gas flow rate using a flow control valve allows for quick response and regulation, while adjusting the gas flow rate using an air pump enables very precise flow control. Therefore, in the above scheme, the oxygen flow rate in the first gas delivery pipe 2 is controlled simultaneously by the first flow control valve 25 and the first air pump 26, satisfying the dual objectives of fast response and precise regulation.

[0058] In this technical solution, a second flow control valve 35 and a second air pump 36 are provided on the second air supply pipe 3. Both the second flow control valve 35 and the second air pump 36 are connected to the control host 10 via signal.

[0059] Similarly, the second flow control valve 35 and the second air pump 36 are used to simultaneously control the air flow in the second air supply pipe 3, achieving the dual goals of rapid response and precise adjustment.

[0060] In this technical solution, a third gas delivery pipe 6 is provided at the outlet of the mixed gas in the mixing device. A gas flow meter 63 and a first oxygen concentration sensor 62 are connected to the third gas delivery pipe 6. Both the gas flow meter 63 and the first oxygen concentration sensor 62 are signal-connected to the control host 10. The control host 10 is equipped with a display screen, which displays the oxygen concentration in the third gas delivery pipe 6 measured by the first oxygen concentration sensor 62.

[0061] The concentration of the mixed gas in the third gas supply pipe 6 is displayed on the screen of the control host 10, allowing users or monitors to understand the concentration of the supplied mixed gas in real time and make timely adjustments to the oxygen concentration. Here, a gas flow meter 63 is directly used on the third gas supply pipe 6 to obtain the flow rate of the mixed gas within it. The measurement is intuitive, and the gas flow rate in the third gas supply pipe 6 is already controlled by the gas flow rates in the aforementioned first and second gas supply pipes 2 and 3. This additional measurement is not for adjusting the gas flow rate in the third gas supply pipe 6; therefore, a gas supply pipe with a uniform diameter is used in the third gas supply pipe 6. The thicker and thinner sections on the aforementioned first and second gas supply pipes 2 and 3 are mainly for more accurate acquisition of the gas pressure within the supply pipes, thereby obtaining the gas flow rate.

[0062] In this technical solution, the mixing device includes a humidifying bottle 4, the first air supply pipe 2 and the second air supply pipe 3 are both connected to the humidifying bottle 4 and their openings extend below the liquid surface of the humidifying liquid. A fourth air supply pipe 5 is connected to the humidifying bottle 4, and the inner end of the fourth air supply pipe 5 is located above the liquid surface of the humidifying liquid. The fourth air supply pipe 5 delivers mixed gas to the oxygen-consuming end.

[0063] By setting up humidifier bottle 4, air and oxygen are mixed to obtain a mixed gas, and the mixed gas is humidified to meet the oxygen demand standards for some occasions.

[0064] In this technical solution, a liquid replenishment pipe 42 is connected to the humidification bottle 4, and a heating component 41 is installed inside the humidification bottle 4. The heating component 41 heats the humidifying liquid inside the humidification bottle 4, increasing the temperature of the humidifying liquid. On the one hand, this provides a temperature for the mixed gas, and on the other hand, as the humidifying liquid rises steadily, the amount of water vapor evaporated also increases. Therefore, increasing the temperature of the humidifying liquid can further increase the humidity of the mixed gas.

[0065] Of course, in some cases, such as when the gas mixture does not need to be humidified, humidifying liquid can be left out of the humidifying bottle 4. In this case, the humidifying bottle will only be used as a gas mixing bottle and will no longer have a humidifying function.

[0066] In this technical solution, the rear of the humidifier bottle 4 is connected to a gas storage bottle 7, and the end of the fourth gas delivery pipe 5 away from the humidifier bottle 4 is connected to and in communication with the gas storage bottle 7.

[0067] The gas storage cylinder 7 is provided with a gas distribution mesh plate 71, and the fourth gas delivery pipe 5 extends into the gas storage cylinder 7 and is placed below the gas distribution mesh plate 71.

[0068] The third gas supply pipe 6 is connected to and conducts through the gas storage cylinder 7, and the connection end of the third gas supply pipe 6 and the gas storage cylinder 7 is located above the gas distribution mesh plate 71.

[0069] The mixed gas passes through the gas distribution mesh plate 71, further realizing the mixing of air and oxygen in the mixed gas.

[0070] The gas storage cylinder 7 temporarily stores the mixed gas, while air and oxygen are further mixed within it to obtain a more homogeneous mixture. The oxygen concentration measured on the third gas delivery pipe 6 is then more accurate. A heating device can be added to the gas storage cylinder 7 to heat the mixture. Combined with the humidifier bottle 4, this allows for individual or simultaneous adjustment of the temperature and humidity of the mixed gas. For example, if a higher temperature but lower humidity mixture is needed, the temperature of the humidifying liquid in the humidifier bottle 4 can be lowered to reduce the humidity of the mixture. The mixture is then reheated within the gas storage cylinder 7 by the heating device to achieve the desired higher temperature and lower humidity. This multi-state adjustment of the mixed gas is simple to operate and low in cost.

[0071] In this technical solution, the gas storage cylinder 7 is also provided with an exhaust port 72, and the exhaust port 72 is provided with a shut-off valve 73. The exhaust port 72 is located above the gas distribution mesh plate 71.

[0072] The gas storage cylinder 7 is equipped with a temperature and humidity sensor 74 and a second oxygen concentration sensor 75. Both the temperature and humidity sensor 74 and the second oxygen concentration sensor 75 are connected to the control host 10 via signal.

[0073] The exhaust port 72 operates during the startup phase of this simple low-flow oxygen supply device with adjustable oxygen concentration, directly discharging the mixed gas in the gas storage cylinder 7 that does not meet the required oxygen concentration. The exhaust port 72 can also be used during the oxygen supply process. If a large change in concentration is required during oxygen supply, a portion of the mixed gas in the gas storage cylinder 7 can be discharged through the exhaust port 72, allowing the gas storage cylinder 7 to quickly obtain the required oxygen concentration, accelerating the adjustment of the oxygen concentration in the mixed gas, and achieving rapid oxygen supply.

[0074] In this technical solution, the third gas supply pipe 6 is characterized by being equipped with a third flow control valve 61. The third flow control valve 61 regulates the flow rate of the mixed gas in the third gas supply pipe 6, thereby further regulating the oxygen flow rate.

[0075] like Figure 2 The diagram shown is a structural schematic of an embodiment of a simple low-flow oxygen supply device with adjustable oxygen concentration according to this utility model. For ease of use and connection of the gas supply pipes, the mixing device, the first gas supply pipe 2, the second gas supply pipe 3, and the third gas supply pipe 6 are all integrated into a box 20. To ensure that the box 20 is upright during use, the box 20 is designed to be wider at the bottom and narrower at the top. In addition, a battery 9 is installed inside the box 20 to supply power to the control host 10 and other components.

[0076] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A simple low-flow oxygen supply device with adjustable oxygen concentration, characterized in that: It includes a control host, an oxygen supply device, an air supply device, and a mixing device. The mixing device is connected to the oxygen-consuming end and supplies the oxygen-air mixture to the oxygen-consuming end. The oxygen-consuming end is signal-connected to the control host and supplies the required oxygen concentration signal to the control host. The oxygen supply device is connected to a first gas supply pipe at its oxygen outlet, and the first gas supply pipe is connected to and in communication with the mixing device. A second air supply pipe is connected to the air outlet of the air supply device, and the second air supply pipe is connected to and in communication with the mixing device. The first gas delivery pipe includes a first thick section and a first thin section. A first pressure sensor and a second pressure sensor are respectively connected to the first thick section and the first thin section. Both the first pressure sensor and the second pressure sensor are connected to the control host. The control host obtains the oxygen flow rate in the first gas delivery pipe based on the oxygen pressure values ​​measured by the first pressure sensor and the second pressure sensor. The control host controls the oxygen supply device to increase or decrease the oxygen delivery flow rate based on the oxygen demand concentration signal delivered by the oxygen-consuming end and the oxygen flow rate signal in the first gas delivery pipe.

2. The simple low-flow oxygen supply device with adjustable oxygen concentration according to claim 1, characterized in that: The second air delivery pipe includes a second thick section and a second thin section. A third pressure sensor and a fourth pressure sensor are respectively connected to the second thick section and the second thin section. Both the third pressure sensor and the fourth pressure sensor are connected to the control host. The control host obtains the air flow rate in the second air delivery pipe based on the air pressure values ​​measured by the third pressure sensor and the fourth pressure sensor. The control host controls the air supply device to increase or decrease the air flow rate based on the oxygen demand concentration signal delivered by the oxygen-consuming end and the air flow rate signal in the second air delivery pipe.

3. The simple low-flow oxygen supply device with adjustable oxygen concentration according to claim 1 or 2, characterized in that: The first air supply pipe is equipped with a first flow control valve and a first air pump, both of which are signal connected to the control host.

4. The simple low-flow oxygen supply device with adjustable oxygen concentration according to claim 1 or 2, characterized in that: The second air supply pipe is equipped with a second flow control valve and a second air pump, both of which are signal connected to the control host.

5. The simple low-flow oxygen supply device with adjustable oxygen concentration according to claim 1 or 2, characterized in that: The mixing device is provided with a third gas delivery pipe at the gas outlet. A gas flow meter and a first oxygen concentration sensor are connected to the third gas delivery pipe. Both the gas flow meter and the first oxygen concentration sensor are connected to the control host. The control host is provided with a display screen, which displays the oxygen concentration in the third gas delivery pipe measured by the first oxygen concentration sensor.

6. The simple low-flow oxygen supply device with adjustable oxygen concentration according to claim 1, characterized in that: The mixing device includes a humidifying bottle, and the first and second air supply pipes are both connected to the humidifying bottle and their openings extend below the surface of the humidifying liquid. A fourth air supply pipe is connected to the humidifying bottle, and the inner end of the fourth air supply pipe is located above the surface of the humidifying liquid. The fourth air supply pipe supplies mixed gas to the oxygen-consuming end.

7. The simple low-flow oxygen supply device with adjustable oxygen concentration according to claim 6, characterized in that: The humidifier bottle is connected to a liquid replenishment tube, and a heating element is installed inside the humidifier bottle.

8. The simple low-flow oxygen supply device with adjustable oxygen concentration according to claim 6, characterized in that: The rear of the humidifier bottle is connected to a gas storage bottle, and the end of the fourth gas delivery pipe away from the humidifier bottle is connected to and in communication with the gas storage bottle; The gas storage cylinder is equipped with a gas distribution mesh plate, and the fourth gas delivery pipe extends into the gas storage cylinder and is placed below the gas distribution mesh plate. The third gas supply pipe is connected to and conducts through the gas storage cylinder, and the connection end of the third gas supply pipe to the gas storage cylinder is located above the gas distribution mesh plate.

9. The simple low-flow oxygen supply device with adjustable oxygen concentration according to claim 8, characterized in that: The gas storage cylinder is also provided with an exhaust port, and the exhaust port is provided with a shut-off valve. The exhaust port is located above the gas distribution mesh plate. The gas storage cylinder is equipped with a temperature and humidity sensor and a second oxygen concentration sensor, both of which are connected to the control host.

10. The simple low-flow oxygen supply device with adjustable oxygen concentration according to claim 1, 8, or 9, characterized in that: The third air supply pipe is equipped with a third flow control valve.

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