Indoor diffuse oxygen supply oxygen concentration control system and method

Abstract

A method for controlling oxygen concentration of indoor diffuse oxygen supply, characterized in that: a user inputs a set power on / off time range value T0 and an altitude value H of the current area in advance; a central controller calculates a corresponding safe oxygen volume fraction y according to formula 1 based on the altitude value H input by the user; formula 1 is y=8.28%×exp(H / 10.41)+14.69%; then, an upper limit value M1 of oxygen concentration is calculated according to M1=y-a, a is a first correction value whose value range is 1.4%-4.2%; a lower limit value M2 of oxygen concentration is calculated according to M2=M1-b, b is a second correction value whose value range is 0.9%-1.8%; when the current time is in the set power on / off time range value T0, when M exceeds the upper limit value M1 of oxygen concentration, the oxygen generator and the solenoid valve are closed, and when M is lower than the lower limit value M2 of oxygen concentration, the oxygen generator and the solenoid valve are opened.

Description

Technical Field

[0001] The invention relates to an oxygen concentrator, and in particular to an indoor diffuse oxygen supply oxygen concentration control system and method. Background Art

[0002] In modern society, with the improvement of living standards and people's increasing attention to health, diffusion oxygen concentrators are gradually favored by more and more people due to their unique advantages.

[0003] A diffuse oxygen generator is a device that can produce and release pure oxygen. Its working principle is mainly based on molecular sieve technology. First, it will draw air from the surrounding air into the compressor, compressing the gas to a higher pressure to increase the concentration of the gas. Next, the compressed gas may be cooled to reduce the temperature and reduce the presence of moisture and other impurities. The gas then passes through a special molecular sieve filter. The specific molecular sieve can selectively adsorb impurities such as nitrogen and let oxygen pass through. Finally, the oxygen-rich gas is released into the entire space, forming a pure oxygen environment.

[0004] Diffuse oxygen concentrators have a wide range of applications. First, in plateau areas, due to the high altitude, the oxygen content in the air is relatively low, which can easily lead to hypoxia in the human body. At this time, the diffuse oxygen concentrator can effectively alleviate altitude sickness and improve people's comfort and quality of life by increasing the oxygen concentration in the indoor environment. Secondly, in medical places such as hospitals and sanatoriums, diffuse oxygen concentrators can provide patients with a continuous and stable supply of oxygen, which helps to improve the condition and recovery speed. In addition, in homes, schools, hotels, Internet cafes and other places, diffuse oxygen concentrators can also be used to increase the oxygen concentration in the indoor environment, improve people's breathing environment, and promote the benign cycle of the human body's metabolic process.

[0005] At present, most household diffused oxygen generators on the market include an oxygen generator, diffused oxygen supply terminal and oxygen concentration control system. Among them, the oxygen generator is used to absorb and separate pure oxygen and transmit it to the oxygen supply terminal through pipelines. The function of the diffused oxygen supply terminal is mainly to diffuse the oxygen provided by the oxygen generator into the room to increase the indoor oxygen concentration. The oxygen concentration control system includes a central controller, an oxygen concentration sensor and a solenoid valve. The solenoid valve is connected to the pipeline between the oxygen generator and the diffused oxygen supply terminal. That is, the indoor oxygen concentration is monitored by the oxygen concentration sensor. When the concentration rises to a certain threshold, the solenoid valve is closed to stop the diffused oxygen supply terminal from supplying oxygen, thereby avoiding the fire hazard caused by excessive indoor oxygen concentration.

[0006] The existing oxygen concentration control system and method cannot set the machine working time, and when the oxygen concentration reaches the requirement, only the solenoid valve is closed but the oxygen generator is not closed, which is not energy-saving. In addition, the oxygen concentration threshold required for different areas of use is also different, and it needs to be input on-site by the installation and debugging personnel or the user. However, it is not easy for ordinary operators to understand what the oxygen concentration should be set to, and they often set it inappropriately, affecting the oxygen supply effect. Summary of the invention

[0007] The purpose of the present invention is to provide an indoor diffuse oxygen supply oxygen concentration control system and method to save energy and reduce consumption, and to replace the setting of the oxygen concentration threshold with the input of the altitude value H of the current area to ensure the accuracy of the setting and thus ensure the oxygen supply effect.

[0008] To achieve the above object, the method and technical solution adopted by the present invention is: a method for controlling the oxygen concentration of indoor diffuse oxygen supply,

[0009] The power on / off time range value T0 and the altitude value H of the current area are set in advance by input; the central controller calculates the corresponding safe oxygen volume fraction y according to the input altitude value H according to formula 1;

[0010] The formula 1 is: y=8.28% ×exp(H / 10.41)+14.69%

[0011] Then, the upper limit value M1 of oxygen concentration is calculated according to M1=ya, a is the first correction value and its value range is 1.4%-4.2%; the lower limit value M2 of oxygen concentration is calculated according to M2=M1-b, b is the second correction value and its value range is 0.9%-1.8%;

[0012] After booting up, follow the steps below:

[0013] Step S11: monitor the indoor oxygen concentration value M and compare it with the oxygen concentration upper limit value M1;

[0014] Step S12: Determine whether M≥M1; if so, close the oxygen generator and the solenoid valve, and execute step S13; if not, execute step S121;

[0015] Step S121: monitor the indoor oxygen concentration value M and compare it with the oxygen concentration lower limit value M2;

[0016] Step S122: determine whether M≤M2; if so, execute step S123; if not, execute step S11;

[0017] Step S123: compare the current time value T with the set power on / off time range value T0;

[0018] Step S124: determine whether T is within the range of T0; if so, start the oxygen generator and the solenoid valve, and execute step S11; if not, execute step S11;

[0019] Step S13: Compare the current time value T with the set power on / off time range value T0;

[0020] Step S131: determine whether T is within the range of T0; if so, execute step S132; if not, execute step S13;

[0021] Step S132: monitor the indoor oxygen concentration value M and compare it with the oxygen concentration lower limit value M2;

[0022] Step S133: determine whether M≤M2; if so, start the oxygen generator and the solenoid valve, and execute step S11; if not, execute step S13.

[0023] In the above scheme, when the central controller detects that the indoor oxygen concentration M is more than 1% lower than the lower limit value M2 of the oxygen concentration, the central controller sends a command to the oxygen generator, and the oxygen generator adjusts the operating frequency of the compressor to output oxygen at the maximum flow rate; when the central controller detects that the indoor oxygen concentration M rises to within 0.5% lower than the upper limit value M1 of the oxygen concentration, the compressor of the oxygen generator reduces the frequency and outputs at 50% of the maximum flow rate, and when the ambient oxygen concentration is between the upper and lower limits, the central controller adjusts the operating frequency of the oxygen generator in real time according to the rate of increase or decrease of the indoor oxygen concentration M, so as to realize dynamic changes in the output flow rate, so as to achieve both energy saving and high efficiency.

[0024] In the above scheme, the central controller converts the indoor oxygen concentration value M measured by the oxygen concentration sensor into an equivalent altitude by looking up the table, and displays the equivalent altitude on the screen, which more intuitively shows the oxygen concentration improvement effect.

[0025] To achieve the above-mentioned purpose, the system technical solution adopted by the present invention is: an indoor diffuse oxygen supply oxygen concentration control system, the system includes a central controller, an oxygen concentration sensor, a temperature and humidity sensor and a solenoid valve, the solenoid valve is serially connected to the oxygen supply pipeline between the oxygen generator host and the diffuse oxygen supply terminal to control the on-off of the oxygen supply pipeline; the oxygen concentration sensor and the temperature and humidity sensor are both connected to the input end of the central controller via wires, and the solenoid valve is connected to the output end of the central controller via wires; and the output end of the central controller is also connected to the oxygen generator host via wires; and the system adopts the above-mentioned control method.

[0026] In the above scheme, the central controller includes a central processing unit, an oxygen concentration detection unit, a temperature and humidity detection unit, a liquid crystal display unit, a clock unit, a relay unit, and a power supply unit; the liquid crystal display unit includes a liquid crystal screen and a liquid crystal screen drive controller.

[0027] In the above solution, the central controller also includes an infrared receiving unit to have an infrared remote control function.

[0028] In the above solution, the central controller also includes a key unit, which includes a key capacitive touch chip BS814A-2, and can input parameters such as time.

[0029] In the above scheme, the central controller also includes an RS485 communication unit. The power supply unit and the RS485 communication unit are specifically a power supply and RS485 communication interface circuit. The power supply and RS485 communication interface circuit includes a primary transformer chip U10, a secondary transformer chip L7805 module and a communication chip 485ECHT module. The input end of the primary transformer chip U10 is connected to the 220V mains power and supplies power to the solenoid valve through an interface CN5. The output end of the primary transformer chip U10 supplies power to the communication chip 485ECHT module through the secondary transformer chip L7805 module. The communication chip 485ECHT module is connected to the oxygen generator host through the communication interface CN1, and provides a signal to the oxygen generator host for adjusting the speed of the host compressor.

[0030] In the above scheme, the clock unit includes a clock chip, pin 2 of the clock chip is connected to the power supply terminal VDD via the first resistor R18, and pin 13 of the clock chip is connected to the power supply terminal VDD via the second resistor R17, the first clock terminal SCL is connected to the pin 2, and the second clock terminal SDA is connected to the pin 13 of the clock chip; pin 6 of the clock chip is connected to the power supply terminal VDD via the first diode D7, and the pin 6 of the clock chip is also connected to the ground via the second diode D6 and the third resistor R14 and the battery B1, and the pin 6 of the clock chip is also connected to the ground after being connected to the capacitor C5 to generate year, month, day, hour, minute and second values ​​for date display and internal timing of the system.

[0031] In the above scheme, the relay unit includes relay KM1 and relay KM2. One end of the relay KM1 is connected to VCC, and the other end is grounded through field effect tube Q2. One end of the relay KM2 is connected to VCC, and the other end is grounded through field effect tube Q3. The central processor is respectively connected to the control ends of the field effect tube Q2 and the field effect tube Q3 to control the on and off of the circuits of the relay KM1 and the relay KM2. The output terminal interface A of the relay KM1 is connected to the solenoid valve, and the output terminal interface B of the relay KM2 is connected to the oxygen generator host.

[0032] The present invention has the following effects:

[0033] 1. When the indoor oxygen concentration reaches the set upper limit, the present invention can not only close the solenoid valve on the oxygen supply pipeline but also close the oxygen generator, which is beneficial to energy saving and consumption reduction;

[0034] 2. Because the required oxygen concentration of oxygen supply is directly related to the local altitude, and it is not easy for ordinary debugging operators to determine the upper and lower limits of oxygen concentration, but they certainly know the local altitude value. As long as the local altitude is entered into the system, the most recommended upper and lower limits of oxygen concentration can be automatically calculated to avoid incorrect parameter settings affecting the oxygen supply effect.

[0035] 3. The present invention combines the set working time period with the set upper and lower limits of the indoor oxygen concentration to jointly control the operation of the oxygen generator and the solenoid valve, which is more conducive to energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the structure of the indoor diffuse oxygen supply and oxygen concentration control system of the present invention;

[0037] Figure 2 A schematic diagram of a central controller of an indoor diffuse oxygen supply and oxygen concentration control system of the present invention;

[0038] Figure 3 This is the pin diagram of the central processor ATMEGA8 single-chip microcomputer of the indoor diffuse oxygen supply and oxygen concentration control system of the present invention;

[0039] Figure 4 This is a schematic diagram of the interface of the temperature and humidity detection unit of the indoor diffuse oxygen supply and oxygen concentration control system of the present invention;

[0040] Figure 5 This is a schematic diagram of the interface of the oxygen concentration detection unit of the indoor diffuse oxygen supply oxygen concentration control system of the present invention;

[0041] Figure 6 This is the pin diagram of the LCD screen drive controller HT16C23 of the indoor diffuse oxygen supply oxygen concentration control system of the present invention;

[0042] Figure 7 The clock unit circuit diagram of the indoor diffuse oxygen supply oxygen concentration control system of the present invention;

[0043] Figure 8 It is the power supply and RS485 communication interface circuit diagram of the indoor diffuse oxygen supply oxygen concentration control system of the present invention;

[0044] Fig. 9 This is a circuit diagram of an infrared receiving unit of an indoor diffuse oxygen supply and oxygen concentration control system of the present invention;

[0045] Fig.10 It is a circuit diagram of the control interface between the solenoid valve and the oxygen generator host of the indoor diffuse oxygen supply and oxygen concentration control system of the present invention;

[0046] Fig.11 This is a circuit diagram of a key unit of an indoor diffuse oxygen supply and oxygen concentration control system of the present invention;

[0047] Fig.12 It is the central controller operation interface of the indoor diffuse oxygen supply and oxygen concentration control system of the present invention;

[0048] Fig.13 The present invention is a flow chart of the method for controlling oxygen concentration of indoor diffuse oxygen supply. DETAILED DESCRIPTION

[0049] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Example

[0050] A method for controlling the oxygen concentration of indoor diffuse oxygen supply, wherein a field commissioning personnel or a user inputs a setting start / stop time range value T0 and an altitude value H of the current area in advance; a central controller calculates the corresponding safe oxygen volume fraction y according to the input altitude value H according to formula 1;

[0051] The formula 1 is: y=8.28% ×exp(H / 10.41)+14.69%

[0052] Then, the upper limit value M1 of oxygen concentration is calculated according to M1=ya, a is the first correction value and its value range is 1.4%-4.2%; the lower limit value M2 of oxygen concentration is calculated according to M2=M1-b, b is the second correction value and its value range is 0.9%-1.8%;

[0053] After booting up, follow the steps below: Fig.13 As shown,

[0054] Step S11: monitor the indoor oxygen concentration value M and compare it with the oxygen concentration upper limit value M1;

[0055] Step S12: Determine whether M≥M1? If so, close the oxygen generator and the solenoid valve, and execute step S13; if not, execute step S121;

[0056] Step S121: monitor the indoor oxygen concentration value M and compare it with the oxygen concentration lower limit value M2;

[0057] Step S122: Determine whether M≤M2? If so, execute step S123; if not, execute step S11;

[0058] Step S123: compare the current time value T with the set power on / off time range value T0;

[0059] Step S124: Determine whether T is within the range of T0. If so, turn on the oxygen generator and the solenoid valve, and execute step S11; if not, execute step S11;

[0060] Step S13: Compare the current time value T with the set power on / off time range value T0;

[0061] Step S131: Determine whether T is within the range of T0. If yes, execute step S132; if no, execute step S13;

[0062] Step S132: monitor the indoor oxygen concentration value M and compare it with the oxygen concentration lower limit value M2;

[0063] Step S133: Determine whether M≤M2. If so, start the oxygen generator and the solenoid valve, and execute step S11; if not, execute step S13.

[0064] In this way, the operation of the oxygen generator and the solenoid valve are controlled in accordance with the set working time period and the upper and lower limits of the indoor oxygen concentration, thereby further saving energy and reducing consumption.

[0065] When the central controller detects that the indoor oxygen concentration M is more than 1% lower than the lower limit of oxygen concentration M2, the central controller sends a command to the oxygen generator, and the oxygen generator adjusts the operating frequency of the compressor to output oxygen at the maximum flow rate; when the central controller detects that the indoor oxygen concentration M rises to within 0.5% lower than the upper limit of oxygen concentration M1, the compressor of the oxygen generator runs at a reduced frequency and outputs at 50% of the maximum flow rate. In addition, when the ambient oxygen concentration is between the upper and lower limits, the central controller will adjust the operating frequency of the oxygen generator in real time according to the rate of increase or decrease of the indoor oxygen concentration M, so as to achieve dynamic changes in the output flow rate, so as to achieve both energy saving and high efficiency.

[0066] The central processing unit converts the indoor oxygen concentration value M measured by the oxygen concentration sensor into an equivalent altitude through a corresponding lookup table, and displays the equivalent altitude on the screen, showing the oxygen concentration improvement effect more intuitively.

[0067] When the indoor oxygen concentration reaches the set upper limit, the present embodiment of the invention can not only close the solenoid valve on the oxygen supply pipeline but also close the oxygen generator, which is beneficial to energy saving and consumption reduction. In addition, because the required oxygen concentration of the oxygen supply is directly related to the local altitude, the user may not know what the upper and lower limits of the oxygen concentration should be, but he certainly knows the local altitude value. As long as the local altitude is input into the system, the recommended upper and lower limit setting parameters of the oxygen concentration can be automatically given to avoid incorrect settings affecting the oxygen supply effect.

[0068] Example 2: See Figure 1-12 :

[0069] An indoor diffuse oxygen supply oxygen concentration control system, see Figure 1 As shown, the system includes a central controller, an oxygen concentration sensor, a temperature and humidity sensor, and a solenoid valve; the solenoid valve is connected in series to the oxygen supply pipeline between the oxygen generator and the diffuse oxygen supply terminal to control the on-off of the oxygen supply pipeline.

[0070] See also Figure 1 As shown, the oxygen concentration sensor and the temperature and humidity sensor are connected to the input end of the central controller via wires, and the solenoid valve is connected to the output end of the central controller via wires; and the output end of the central controller is also connected to the oxygen generator via wires to control the start and stop of the oxygen generator.

[0071] See also Figure 2 As shown, the central controller includes a central processing unit, an oxygen concentration detection unit, a temperature and humidity detection unit, a liquid crystal display unit, a clock unit, a relay unit, and a power supply unit; the liquid crystal display unit includes a liquid crystal screen and a liquid crystal screen drive controller.

[0072] The central controller also includes an infrared receiving unit and a key unit to have an infrared remote control function, and the user can input parameters such as time.

[0073] The central controller also includes an RS485 communication unit.

[0074] The temperature and humidity sensor and the oxygen concentration sensor are installed on the mainboard of the central controller, and the oxygen generator and the solenoid valve are connected to the central controller via a signal line.

[0075] Specific as Figure 3 The central processor is composed of ATMEGA8 single-chip microcomputer and peripheral circuits. The central processor is responsible for data transmission and processing between various sensors and other input and output units.

[0076] like Figure 4 The temperature and humidity sensor uses the AM2320 chip, which is soldered on the U8 interface of the central controller motherboard and can collect indoor temperature and humidity data in real time.

[0077] like Figure 5 The oxygen concentration detection unit is installed on the central controller mainboard through the connector U1, and can detect the indoor oxygen concentration in real time.

[0078] like Figure 6 The liquid crystal display unit specifically adopts a HT16C23 LCD driver controller, which can control the character display of the liquid crystal panel.

[0079] like Figure 7 The core of the clock unit is a R8025 clock chip. Specifically, the 2nd pin of the clock chip R8025 is connected to the power supply terminal VDD through the first resistor R18, and the 13th pin of the clock chip is connected to the power supply terminal VDD through the second resistor R17. The 2nd pin is connected to the first clock terminal SCL, and the 13th pin is connected to the second clock terminal SDA; the 6th pin is connected to the power supply terminal VDD through the first diode D7, and the 6th pin is also connected to the ground through the second diode D6 and the third resistor R14 and the battery B1. The 6th pin is also connected to the ground after being connected to the capacitor C5.

[0080] like Figure 8 The main body of the power supply unit is the RH1201 power supply module, which can convert the input AC 220V voltage into DC 12V voltage. The RS485 communication unit uses the RSM485ECHT isolation transceiver chip to provide 485 communication function for the central controller. The CN1 terminal is connected to the oxygen host control board. Specifically as follows: the power supply unit and the RS485 communication unit are specifically a power supply and RS485 communication interface circuit, which includes a primary transformer chip U10, a secondary transformer chip L7805 module and a communication chip 485ECHT module. The input end of the primary transformer chip U10 is connected to the 220V mains, and supplies power to the solenoid valve through an interface CN5. The output end of the primary transformer chip U10 supplies power to the communication chip 485ECHT module through the secondary transformer chip L7805 module. The communication chip 485ECHT module is connected to the oxygen generator host through the communication interface CN1, and sends a signal to the oxygen generator host for adjusting the speed of the host compressor. In this way, it has RS485 communication function and can send a signal to the oxygen generator host for adjusting the speed of the host compressor.

[0081] like Fig. 9 The infrared receiving unit adopts 1838 infrared receiving head, which can provide infrared remote control function for the central controller.

[0082] like Fig.10 The relay unit is divided into two parts. The output terminal of relay KM1 is CN2, which is connected to the solenoid valve. The output terminal of relay KM2 is CN3, which is connected to the oxygen generator. The relay unit includes relay KM1 and relay KM2. One end of the relay KM1 is connected to VCC, and the other end is grounded through the field effect tube Q2. One end of the relay KM2 is connected to VCC, and the other end is grounded through the field effect tube Q3. The central processor is respectively connected to the control end of the field effect tube Q2 and the field effect tube Q3, which is used to control the circuit on and off of the relay KM1 and the relay KM2. The output terminal interface A of the relay KM1 is connected to the solenoid valve, and the output terminal interface B of the relay KM2 is connected to the oxygen generator.

[0083] like Fig.11 The specific core of the key unit is a key capacitive touch chip BS814A-2, which is responsible for the control of the 4 touch keys of the key unit. Specifically, pin 1 of the key capacitive touch chip BS814A-2 is connected to the SET key, pin 2 is connected to the UP key, pin 3 is connected to the ON / OFF key, and pin 4 is connected to the DOWN key.

[0084] like Fig.12 The central controller screen displays the content, the first row of characters displays the current date and time, the second row displays the current ambient oxygen concentration, the third row displays the current equivalent altitude, the fourth row displays the set oxygen generator start time and shutdown time, the fifth row displays the current indoor temperature and humidity, and the sixth row displays the current working status of the solenoid valve and the oxygen generator.

[0085] The user's operation instructions during the actual working process of this embodiment are as follows:

[0086] 1. Turn on the machine;

[0087] The control system is connected to AC220V / 50Hz mains power. The user presses the switch to "I" to turn on the control system. At this time, the backlight of the display is on, the screen shows the current date and time, and the letter "OFF" is displayed in the oxygen concentration display area. Touch the ON / OFF key, and the "Altitude" area displays a countdown of 178 seconds. At this time, the oxygen concentration value cannot correctly reflect the ambient indoor oxygen concentration value. After 3 minutes, it starts to correctly measure the indoor oxygen concentration.

[0088] When the indoor oxygen concentration M is higher than the upper limit of oxygen concentration M1, the solenoid valve and the oxygen generator are closed, and the diffuse oxygen supply terminal stops supplying oxygen; when the indoor oxygen concentration M is lower than the lower limit of oxygen concentration M2, the solenoid valve and the oxygen generator are opened, and the diffuse oxygen supply terminal starts supplying oxygen.

[0089] 2. "Power on time" setting

[0090] The user long presses the panel "SET" button or the remote control function setting button until the function setting symbol is displayed. At this time, the power-on time hour value starts to flash. Use the "▲", "▼" keys on the operation panel or the "+", "-" keys on the remote control to adjust the hour value until the target value is displayed. When the hour value is adjusted, press the panel "SET" button or the remote control function setting button. At this time, the minute value starts to flash. Use the "▲", "▼" keys on the operation panel or the "+", "-" keys on the remote control to adjust the minute value until the target value is displayed.

[0091] 3. "Shutdown time" setting

[0092] When the minute value of "On Time" is adjusted, press the "SET" button on the panel or the function setting button on the remote control. The hour value of the Off Time starts flashing. Use the "▲", "▼" buttons on the operation panel or the "+", "-" buttons on the remote control to adjust the hour value until the target value is displayed. When the hour value is adjusted, press the "SET" button on the panel or the function setting button on the remote control. The minute value starts flashing. Use the "▲", "▼" buttons on the operation panel or the "+", "-" buttons on the remote control to adjust the minute value until the target value is displayed.

[0093] 4. "Scheduled power on / off" settings

[0094] When the minute value of "off time" is adjusted, press the "SET" button on the panel or the function setting button on the remote control. At this time, "on time" and "off time" begin to flash. Use the "▲", "▼" buttons on the operation panel or the "+", "-" buttons on the remote control to adjust the on / off time value until "--:--" is displayed. At this time, the timer on / off function is turned off and oxygen will continue to be supplied. If you need to turn on the timer on / off function, repeat this operation.

[0095] The embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling oxygen concentration of indoor diffuse oxygen supply, characterized in that: The power on / off time range value T0 and the altitude value H of the current area are input in advance; the central processor calculates the corresponding safe oxygen volume fraction y according to the input altitude value H according to formula 1; The formula 1 is: y=8.28% ×exp(H / 10.41)+14.69% Then, the upper limit value M1 of oxygen concentration is calculated according to M1=ya, a is the first correction value and its value range is 1.4%-4.2%; the lower limit value M2 of oxygen concentration is calculated according to M2=M1-b, b is the second correction value and its value range is 0.9%-1.8%; After booting up, follow the steps below: Step S11: monitor the indoor oxygen concentration value M and compare it with the upper limit value M1 of the oxygen concentration; Step S12: Determine whether M≥M1; if so, shut down the oxygen generator and the solenoid valve on the oxygen supply pipeline, and execute step S13; if not, execute step S121; Step S121: monitor the indoor oxygen concentration value M and compare it with the oxygen concentration lower limit value M2; Step S122: determine whether M≤M2; if so, execute step S123; if not, execute step S11; Step S123: compare the current time value T with the set power on / off time range value T0; Step S124: determine whether T is within the range of T0; if so, start the oxygen generator and the solenoid valve on the oxygen supply pipeline, and execute step S11; If not, execute step S11; Step S13: Compare the current time value T with the set power on / off time range value T0; Step S131: determine whether T is within the range of T0; if so, execute step S132; if not, execute step S13; Step S132: monitor the indoor oxygen concentration value M and compare it with the oxygen concentration lower limit value M2; Step S133: Determine whether M≤M2; if so, start the oxygen generator and the solenoid valve on the oxygen supply pipeline, and execute step S11; if not, execute step S13.

2. The method for controlling oxygen concentration of indoor diffuse oxygen supply according to claim 1, characterized in that: When the indoor oxygen concentration M is monitored to be more than 1% lower than the lower limit of oxygen concentration M2, the central processor sends a command to the oxygen generator host, and the oxygen generator host adjusts the operating frequency of the compressor to output oxygen at the maximum flow rate; when the indoor oxygen concentration M is monitored to rise to within 0.5% lower than the upper limit of oxygen concentration M1, the central processor sends a command to control the compressor of the oxygen generator host to reduce the frequency and output at 50% of the maximum flow rate.

3. The method for controlling oxygen concentration of indoor diffuse oxygen supply according to claim 1, characterized in that: The central processor converts the indoor oxygen concentration value M measured by the oxygen concentration sensor into an equivalent altitude by looking up the corresponding table, and displays the equivalent altitude on the screen.

4. An indoor diffuse oxygen supply oxygen concentration control system, characterized in that: The system includes a central controller, an oxygen concentration sensor, a temperature and humidity sensor, and a solenoid valve. The solenoid valve is connected in series to the oxygen supply pipeline between the oxygen generator and the diffuse oxygen supply terminal to control the on-off of the oxygen supply pipeline. The oxygen concentration sensor and the temperature and humidity sensor are both connected to the input end of the central controller via wires, and the solenoid valve is connected to the output end of the central controller via wires. Moreover, the output end of the central controller is also connected to the oxygen generator via wires. Moreover, the system adopts the control method of one of the above claims 1-3.

5. The indoor diffuse oxygen supply and oxygen concentration control system according to claim 4 is characterized in that: The central controller includes a central processing unit, an oxygen concentration detection unit, a temperature and humidity detection unit, a liquid crystal display unit, a clock unit, a relay unit, and a power supply unit; the liquid crystal display unit includes a liquid crystal screen and a liquid crystal screen driving controller.

6. The indoor diffuse oxygen supply and oxygen concentration control system according to claim 5, characterized in that: The central controller also includes an infrared receiving unit.

7. The indoor diffuse oxygen supply and oxygen concentration control system according to claim 5, characterized in that: The central controller also includes a key unit, which includes a key capacitive touch chip BS814A-2.

8. The indoor diffuse oxygen supply and oxygen concentration control system according to claim 5, characterized in that: The central controller also includes an RS485 communication unit. The power supply unit and the RS485 communication unit are specifically a power supply and RS485 communication interface circuit. The power supply and RS485 communication interface circuit includes a primary transformer chip U10, a secondary transformer chip L7805 module and a communication chip 485ECHT module. The input end of the primary transformer chip U10 is connected to the 220V mains power and supplies power to the solenoid valve through an interface CN5. The output end of the primary transformer chip U10 supplies power to the communication chip 485ECHT module through the secondary transformer chip L7805 module. The communication chip 485ECHT module is connected to the oxygen generator host through the communication interface CN1, and provides a signal to the oxygen generator host for adjusting the speed of the host compressor.

9. The indoor diffuse oxygen supply and oxygen concentration control system according to claim 5, characterized in that: The clock unit includes a clock chip, wherein pin 2 of the clock chip is connected to the power supply terminal VDD via a first resistor R18, and pin 13 of the clock chip is connected to the power supply terminal VDD via a second resistor R17, pin 2 of the clock chip is connected to a first clock terminal SCL, and pin 13 of the clock chip is connected to a second clock terminal SDA; pin 6 of the clock chip is connected to the power supply terminal VDD via a first diode D7, and pin 6 of the clock chip is also connected to ground via a second diode D6, a third resistor R14, and a battery B1, and pin 6 of the clock chip is also connected to ground via a capacitor C5.

10. The indoor diffuse oxygen supply and oxygen concentration control system according to claim 5, characterized in that: The relay unit includes a relay KM1 and a relay KM2. One end of the relay KM1 is connected to VCC, and the other end is grounded through a field effect tube Q2. One end of the relay KM2 is connected to VCC, and the other end is grounded through a field effect tube Q3. The central processor is respectively connected to the control ends of the field effect tube Q2 and the field effect tube Q3 to control the on and off of the circuits of the relay KM1 and the relay KM2. The output terminal interface A of the relay KM1 is connected to the solenoid valve, and the output terminal interface B of the relay KM2 is connected to the oxygen generator host.

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