An oxygen concentrator

Abstract

The present invention discloses an oxygen concentrator, comprising a housing, a nitrogen-oxygen separation tower, a positive- and negative-pressure air compressor, an oxygen storage tank, and a control unit. The positive- and negative-pressure air compressor, the nitrogen-oxygen separation tower, the oxygen storage tank, the ultrasonic flowmeter, the electromagnetic proportional valve, and the oxygen outlet of the housing are sequentially connected. The oxygen storage tank, the housing, and the oxygen outlet of the housing are respectively equipped with a first pressure sensor, a second pressure sensor, and a pulsating pressure sensor electrically connected to the control unit. The control unit controls the motor speed of the positive- and negative-pressure air compressors to achieve continuous high-oxygen-concentration oxygen output based on a comparison between a pressure detection value of the first pressure sensor or the second pressure sensor and a preset value. The control unit adjusts the opening state of the electromagnetic proportional valve according to the respiratory pressure difference detection value of the pulsating pressure sensor, thereby adjusting the oxygen output flow rate. The present invention has the advantages of maintaining continuous oxygen supply at high oxygen concentrations in high-altitude areas, dynamically adjusting the oxygen output flow rate according to differences in human vital capacity, and ensuring high oxygen absorption efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of oxygen production equipment, and in particular relates to an oxygen concentrator. Background Art

[0002] Oxygen concentrator is a commonly used oxygen collection device. Its working principle is to use zeolite molecular sieve as adsorbent, and utilize the principle of pressurized adsorption and reduced pressure desorption to adsorb and release nitrogen in the air, thereby completing oxygen collection and concentration increase.

[0003] Existing oxygen concentrators have the following defects: they are unable to efficiently maintain high oxygen concentration and continuous oxygen supply under different altitude conditions, especially in high-altitude and low-pressure environments; and they are unable to dynamically adjust oxygen supply according to the oxygen inhalation needs of different users.

[0004] In addition, existing oxygen concentrators generally use PSA technology with high-pressure adsorption and normal-pressure desorption. In order to ensure sufficient oxygen output flow, the pressure of the entire system needs to be increased. The increase in pressure leads to greater compression of the compressor, increased power consumption, and shortened battery operating time. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems in the background technology and propose an oxygen concentrator that can efficiently maintain an oxygen concentration of 90% and continuously supply oxygen in high-altitude areas. It dynamically adjusts the oxygen output flow rate according to the differences in human lung capacity to ensure high oxygen absorption efficiency, and adopts positive pressure adsorption and negative pressure desorption technology to reduce energy consumption.

[0006] To achieve the above objectives, the present invention provides an oxygen concentrator comprising a housing, a nitrogen-oxygen separation tower mounted within the housing, a positive- and negative-pressure air compressor, an oxygen storage tank, and a control unit. The air inlet and nitrogen outlet of the nitrogen-oxygen separation tower are connected to the positive- and negative-pressure air compressors, the oxygen outlet of the nitrogen-oxygen separation tower is connected to the oxygen storage tank, the air outlet of the oxygen storage tank is connected to the air inlet of an ultrasonic flowmeter, the air outlet of the ultrasonic flowmeter, an electromagnetic proportional valve, and an oxygen outlet on the housing are sequentially connected. The oxygen storage tank and the housing are respectively mounted with a first pressure sensor for detecting the oxygen pressure within the tank and a second pressure sensor for detecting the external atmospheric pressure. The oxygen outlet is provided with a pulsating pressure sensor. The first pressure sensor, the second pressure sensor, and the pulsating pressure sensor are all connected to the control unit. The control unit controls the motor speed of the positive- and negative-pressure air compressors based on a comparison of a pressure detection value fed back by the first or second pressure sensor with a preset value to achieve continuous high-oxygen-concentration oxygen output at the oxygen outlet. The control unit dynamically adjusts the opening state of the electromagnetic proportional valve based on a respiratory pressure differential detection value fed back by the pulsating pressure sensor, thereby adjusting the oxygen output flow rate.

[0007] Preferably, the nitrogen and oxygen separation tower includes a stepper motor, a molecular sieve cylinder, an air separation valve assembly and an oxygen separation valve assembly installed at the upper and lower ends of the molecular sieve cylinder, a compressed air path, an oxygen path and a nitrogen path are formed between the air separation valve assembly, the molecular sieve cylinder and the oxygen separation valve assembly, the molecular sieve cylinder is provided with an air inlet, a nitrogen outlet and an oxygen outlet, the air separation valve assembly and the oxygen separation valve assembly are connected by a central shaft, the stepper motor is installed on one side of the molecular sieve cylinder and is connected to the upper end of the central shaft by a gear set transmission mechanism, after the stepper motor drives the central shaft to rotate, the air separation valve assembly and the oxygen separation valve assembly rotate synchronously to change the on-off between the compressed air path, the oxygen path and the nitrogen path, thereby realizing intermittent cyclic air supply or oxygen discharge or desorption state switching of the nitrogen and oxygen separation tower.

[0008] Preferably, the air separation valve assembly includes an upper distribution valve and an intake valve plate, the upper distribution valve is provided with a compressed air channel and a nitrogen channel, the intake valve plate is provided with a compressed air hole connected to the air inlet and a nitrogen hole connected to the nitrogen outlet, the oxygen separation valve assembly includes an exhaust valve plate and a lower distribution valve, the lower distribution valve is provided with a pressure equalizing hole, a backflush hole and an oxygen channel, the exhaust valve plate is provided with a vent connected to the oxygen outlet, and after the upper distribution valve and the lower distribution valve rotate around the central axis under the action of the driving force, the compressed air channel and the compressed air hole, the nitrogen channel and the nitrogen hole, and the vent and the oxygen channel are connected or disconnected with each other, thereby realizing intermittent cyclic air supply or oxygen discharge or desorption state switching of the nitrogen and oxygen separation tower.

[0009] Preferably, the positive and negative pressure air compressor includes a permanent magnet brushless motor, an air compressor and a vacuum pump. The air compressor and the vacuum pump are respectively connected to the bidirectional output ends of the permanent magnet brushless motor in a one-to-one correspondence. The air compressor and the vacuum pump are respectively connected to the air inlet and the nitrogen outlet of the nitrogen and oxygen separation tower by air pipes. The permanent magnet brushless motor is equipped with a Hall sensor for detecting the speed, and the Hall sensor is connected to the control unit.

[0010] Preferably, the vacuum pump is connected to an exhaust pipe, and the exhaust pipe is provided with a muffler.

[0011] Preferably, an air cooling channel is provided on the housing of the permanent magnet brushless motor, and balancing blocks are installed on both bidirectional output ends of the permanent magnet brushless motor.

[0012] Preferably, the oxygen concentrator further comprises a power supply, a display operation panel, an integrated drive panel, and a power control panel installed on the outer shell. The outer shell is provided with a power supply positioning seat and a charging socket. The power supply is installed on the power supply positioning seat. The display operation panel, the integrated drive panel, and the power control panel are all connected to the control unit.

[0013] Preferably, the housing includes a control unit housing and a host housing, the control unit housing and the host housing are connected by a ring and a shock-absorbing ring, and the housing is made of fiber material.

[0014] Preferably, a temperature sensor for detecting the internal oxygen temperature is installed inside the ultrasonic flowmeter. The temperature sensor is connected to a control unit. The control unit adjusts the opening state of the electromagnetic proportional valve according to the change of the oxygen temperature detection value of the temperature sensor so that the measurement value of the ultrasonic flowmeter is maintained at a predetermined value.

[0015] Preferably, the oxygen storage tank is installed closely to the side wall of the positive and negative pressure air compressor, and the opening of the electromagnetic proportional valve adopts feedforward control.

[0016] The beneficial effects of the present invention are as follows: by arranging a pulsating pressure sensor at the oxygen outlet of the housing, the control unit dynamically adjusts the opening state of the electromagnetic proportional valve according to the respiratory pressure difference detection value fed back by the pulsating pressure sensor, thereby adjusting the oxygen output flow rate, so that the oxygen concentrator dynamically adjusts the oxygen output flow rate according to different human vital capacities to ensure high oxygen absorption efficiency.

[0017] By providing a first pressure sensor for detecting the oxygen pressure in the tank and a second pressure sensor for detecting the external atmospheric pressure, the control unit controls the motor speed of the positive and negative pressure air compressors based on the pressure detection value fed back by the first pressure sensor or the second pressure sensor and compared with a preset value to achieve continuous high oxygen concentration oxygen output at the oxygen outlet. This allows the positive and negative pressure air compressor speeds to be at an optimal level under different altitude conditions and oxygen supply volumes, and the oxygen concentrator can efficiently maintain an oxygen concentration of 90% and continuously supply oxygen in high-altitude areas.

[0018] The air inlet and nitrogen outlet of the nitrogen-oxygen separation tower are connected to the positive and negative pressure air compressors, which use positive pressure adsorption and negative pressure desorption technology to reduce the energy consumption of the oxygen concentrator.

[0019] The features and advantages of the present invention will be described in detail through embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional schematic diagram of an embodiment of the present invention.

[0021] Figure 2 It is a schematic diagram of the working principle of an embodiment of the present invention.

[0022] Figure 3 Schematic diagram of a nitrogen-oxygen separation tower according to an embodiment of the present invention.

[0023] Figure 4 2 is a schematic cross-sectional view of a nitrogen-oxygen separation tower according to an embodiment of the present invention.

[0024] Figure 5 It is a partial schematic diagram of a nitrogen and oxygen separation tower according to an embodiment of the present invention.

[0025] Figure 6It is a partial cross-sectional schematic diagram of a nitrogen and oxygen separation tower according to an embodiment of the present invention.

[0026] Figure 7 Schematic diagram of a positive and negative pressure air compressor according to an embodiment of the present invention.

[0027] Figure 8 Schematic diagram of a permanent magnet brushless motor according to an embodiment of the present invention.

[0028] Figure 9 2 is a schematic cross-sectional view of a permanent magnet brushless motor according to an embodiment of the present invention.

[0029] Figure 10 Schematic diagram of an ultrasonic flowmeter according to an embodiment of the present invention.

[0030] Figure 11 Schematic diagram of the upper distribution valve according to an embodiment of the present invention.

[0031] Figure 12 Schematic diagram of an air intake valve plate according to an embodiment of the present invention.

[0032] Figure 13 Schematic diagram of the lower distribution valve according to an embodiment of the present invention.

[0033] Figure 14 Schematic diagram of an exhaust valve plate according to an embodiment of the present invention.

[0034] In the figure: 1-housing, 2-nitrogen and oxygen separation tower, 3-positive and negative pressure air compressor, 4-control unit, 5-ultrasonic flow meter, 6-electromagnetic proportional valve, 11-charging socket, 12-power positioning seat, 20-stepping motor, 21-air separation valve assembly, 22-oxygen separation valve assembly, 23-molecular sieve cartridge, 24-center shaft, 31-air compressor, 32-permanent magnet brushless motor, 33-vacuum pump, 34-air inlet, 35-balance block, 36-air cooling vent Channel, 211-upper distribution valve, 212-intake valve plate, 213-compressed air channel, 214-nitrogen channel, 215-compressed air hole, 216-nitrogen hole, 221-exhaust valve plate, 222-lower distribution valve, 223-vent, 224-oxygen channel, 225-flushing hole, 226-backflush hole, 231-upper end cover, 232-cylinder, 233-lower end cover, 234-air inlet, 235-nitrogen outlet, 236-oxygen outlet. DETAILED DESCRIPTION

[0035] See Figure 1 、 Figure 2 and Figure 10This embodiment provides an oxygen concentrator, including a housing 1, a nitrogen-oxygen separation tower 2 installed inside the housing 1, a positive and negative pressure air compressor 3, an oxygen storage tank, and a control unit 4. The air inlet 234 and the nitrogen outlet 235 of the nitrogen-oxygen separation tower 2 are connected to the positive and negative pressure air compressor 3, and the oxygen outlet 236 of the nitrogen-oxygen separation tower 2 is connected to the oxygen storage tank. The air outlet end of the oxygen storage tank is connected to the air inlet end of the ultrasonic flowmeter 5. The air outlet end of the ultrasonic flowmeter 5, the electromagnetic proportional valve 6, and the oxygen outlet on the housing 1 are connected in sequence. The oxygen storage tank and the housing 1 are respectively installed with a first pressure sensor for detecting the oxygen pressure in the tank and a second pressure sensor for detecting the external atmospheric pressure. The oxygen outlet is provided with a pulsating pressure sensor. The first pressure sensor, the second pressure sensor, and the pulsating pressure sensor are all electrically connected to the control unit 4. The control unit 4 adopts PI D control method controls the motor speed of the positive and negative pressure air compressor 3 after comparing the pressure detection values ​​fed back by the first pressure sensor and the second pressure sensor with the preset values ​​stored in the control unit to achieve continuous oxygen output at an oxygen concentration higher than 90% at the oxygen outlet. The preset value includes a preset external atmospheric pressure value or a preset oxygen pressure value. The control unit 4 dynamically adjusts the opening state of the electromagnetic proportional valve 6 according to the respiratory pressure difference detection value fed back by the pulsating pressure sensor to adjust the oxygen output flow rate. The control unit 4 includes an MCU chip, and a buzzer connected to the control unit 4 is installed inside the shell 1. The control unit 4 is electrically connected to each electrical component on the oxygen concentrator and controls the working conditions of each electrical component. The oxygen outlet is provided with a filter, and the shell 1 is provided with a shoulder strap. The opening state of the electromagnetic proportional valve 6 includes the opening time and opening degree of the electromagnetic proportional valve 6.

[0036] See 3 to Figure 6 as well as Figures 11 to 14The nitrogen and oxygen separation tower 2 includes a stepper motor 20, a molecular sieve cylinder 23, an air separation valve assembly 21 and an oxygen separation valve assembly 22 installed at the upper and lower ends of the molecular sieve cylinder 23, a compressed air gas path, an oxygen gas path, and a nitrogen gas path are formed between the air separation valve assembly 21, the molecular sieve cylinder 23, and the oxygen separation valve assembly 22, the molecular sieve cylinder 23 is provided with an air inlet 234 connected to the compressed air gas path, a nitrogen outlet 235 connected to the nitrogen gas path, and an oxygen outlet 236 connected to the nitrogen gas path. The air separation valve assembly 21 and the oxygen separation valve assembly 22 are connected by a central shaft 24, the stepper motor 20 is installed on one side of the molecular sieve cylinder 23 and is connected to the upper end of the central shaft 24 by a gear train transmission mechanism, and the stepper motor 20 drives the central shaft 24 to rotate, and then the air separation valve The component 21 and the oxygen separation valve component 22 rotate synchronously to change the on-off state between the compressed air path, the oxygen path, and the nitrogen path, thereby realizing the intermittent cyclic air supply or oxygen discharge or desorption state switching of the nitrogen and oxygen separation tower 2. The gear set transmission mechanism includes a driving gear, an intermediate gear, and an involute gear that mesh with each other in sequence. The involute gear and the driving gear are respectively connected to the central shaft 24 and the output end of the stepper motor 20. The stepper motor 20 is electrically connected to the control unit. The control unit controls the speed of the stepper motor 20 to further control the oxygen output, compressed air intake, and nitrogen discharge of the nitrogen and oxygen separation tower 2. The stepper motor 20 controls the rotation of the air separation valve component 21 to realize compressed air intake, negative pressure nitrogen discharge, and oxygen output switching, so that the overall volume of the nitrogen and oxygen separation tower 2 is small and the failure rate is low.

[0037] The air separation valve assembly 21 includes an upper distribution valve 211 and an intake valve plate 212. The involute gear is integrally arranged on the outer side of the upper distribution valve 211. The upper distribution valve 211 is provided with a compressed air channel 213 and a nitrogen channel 214. The intake valve plate 212 is provided with a compressed air hole 215 connected to the air inlet 234 and a nitrogen hole 216 connected to the nitrogen outlet 235. The oxygen separation valve assembly 22 includes an exhaust valve plate 221 and a lower distribution valve 222. The lower distribution valve 222 is provided with a backflush hole 226, a flushing hole 225 and an oxygen channel 224. The exhaust valve plate 221 is provided with a vent hole 223 connected to the oxygen outlet 236. The stepper motor 20 drives the upper distribution valve 211 and the lower distribution valve After 222 rotates around the central axis 24, the compressed air channel 213 and the compressed air hole 215, the nitrogen channel 214 and the nitrogen hole 216, and the vent hole 223 and the oxygen channel 224 are connected or disconnected with each other, thereby changing the connection and disconnection between the compressed air path, the oxygen path, and the nitrogen path, thereby realizing the intermittent cyclic air supply or oxygen discharge or desorption state switching of the nitrogen and oxygen separation tower 2. The air separation valve assembly 21 and the oxygen separation valve assembly 22 continuously rotate to realize compressed air intake, negative pressure nitrogen discharge, oxygen collection and output. The rotation and switching of the air separation valve assembly 21 and the oxygen separation valve assembly 22 are smooth and the pressure fluctuation is small. The design of the backflush hole 226 and the flushing hole 225 effectively increases the oxygen concentration.

[0038] The air separation valve assembly 21 and the oxygen separation valve assembly 22 are both made of PEEK material added with self-lubricating material to achieve long-term oil-free operation.

[0039] The molecular sieve cartridge 23 includes a barrel 232, an upper end cover 231 and a lower end cover 233 installed on the upper and lower ends of the barrel 232, an air inlet 234 and a nitrogen outlet 235 are provided on the upper end cover 231, an oxygen outlet 236 is provided on the lower end cover 233, an air separation valve assembly 21 is installed on the upper end of the upper end cover 231, and an oxygen separation valve assembly 22 is installed on the lower end of the lower end cover 233. The interior of the barrel 232 is filled with a zeolite molecular sieve.

[0040] See Figures 7 to 9 The positive and negative pressure air compressor 3 includes a permanent magnet brushless motor 32, an air compressor 31 and a vacuum pump 33. The air compressor 31 and the vacuum pump 33 are respectively connected to the bidirectional output ends of the permanent magnet brushless motor 32 in a one-to-one correspondence. The air compressor 31 and the vacuum pump 33 are respectively connected to the air inlet 234 and the nitrogen outlet 235 of the nitrogen and oxygen separation tower 2 by air pipes. The permanent magnet brushless motor 32 is equipped with a Hall sensor 34 for detecting the motor speed. The Hall sensor 34 and the permanent magnet brushless motor 32 are connected to the control unit 4. The operating speed of the permanent magnet brushless motor 32 is 1000 to 6000 rpm. The inner wall of the air compressor 31 is provided with a temperature sensor electrically connected to the control unit 4. The temperature sensor detects the temperature of the compressed air. An air filter is installed at the air inlet end of the air compressor 31.

[0041] The vacuum pump 33 is connected to an exhaust pipe, which is provided with a muffler and a filter. The outlet of the exhaust pipe is connected to the outside of the housing 1 to reduce exhaust noise so that the nitrogen sucked from the nitrogen-oxygen separation tower 2 can be effectively discharged outside the oxygen concentrator.

[0042] An air cooling channel 36 is provided on the shell of the permanent magnet brushless motor 32, and a balancing block 35 is installed at the bidirectional output end of the permanent magnet brushless motor 32. The air cooling design is adopted, and the air flow directly cools the motor coil through the gap between the stator and rotor of the permanent magnet brushless motor 32 to ensure that the operating temperature of the motor is at a reasonable level. The balancing block 35 is provided to ensure the rotation balance of the output end of the permanent magnet brushless motor 32.

[0043] The oxygen concentrator also includes a power supply, a display operation panel, an integrated drive board, and a power control board mounted on the housing 1. The housing 1 is provided with a power positioning seat 12 and a charging socket 11. The charging socket 11 is an aviation socket. The power supply is mounted on the power positioning seat 12. The display operation panel, the integrated drive board, and the power control board are all electrically connected to the control unit. The integrated drive board is electrically connected to the stepper motor 20 and the permanent magnet brushless motor 32. The power supply includes a lithium rechargeable battery. The lithium rechargeable battery has a built-in temperature sensor. The temperature sensor is electrically connected to the control unit 4 to monitor the battery temperature in real time, thereby improving the safety of the entire device and extending the battery life.

[0044] The housing 1 includes a control unit housing and a main unit housing, which are connected by a ring and a shock-absorbing ring. The housing 1 is made of fiber material. The entire oxygen concentrator weighs no more than 6 kg and has high strength. The shock-absorbing ring design helps reduce resonance and noise during use of the oxygen concentrator. The housing 1 is removable to facilitate maintenance and replacement of internal components.

[0045] A temperature sensor for detecting the internal oxygen temperature is installed inside the ultrasonic flowmeter 5. The temperature sensor is connected to the control unit 4. Since the oxygen temperature changes and the oxygen output volume changes, the control unit 4 adjusts the opening state of the electromagnetic proportional valve 6 according to the current oxygen temperature feedback value of the temperature sensor, and compensates the measurement value of the ultrasonic flowmeter 5 to ensure the stability of each oxygen output volume flow rate and the measurement accuracy of the ultrasonic flowmeter 5.

[0046] The oxygen storage tank is installed closely to the side wall of the positive and negative pressure air compressor 3, so that the heat generated by the positive and negative pressure air compressor 3 after operation is transferred to the oxygen storage tank to heat the oxygen in the tank, reducing the stimulation of low-temperature oxygen to the human respiratory system.

[0047] The opening of the electromagnetic proportional valve 6 adopts a feedforward control technology so that the user can optimize the oxygen supply in the first 30 milliseconds of inhalation and improve the oxygen absorption efficiency.

[0048] Working process of the present invention:

[0049] During operation, the oxygen concentrator has a continuous oxygen output mode and an intermittent oxygen output mode. It immediately enters the continuous oxygen output mode upon power-up. The user selects the oxygen output mode via the display control panel. After selecting the intermittent oxygen output mode, if no change signal from the pulsating pressure sensor is detected within a predetermined time, the concentrator automatically switches to the continuous oxygen output mode. The electromagnetic proportional valve 6 first opens to a preset opening, and the ultrasonic flowmeter 5 detects the actual output oxygen flow rate and adjusts the oxygen output flow rate in real time based on the actual flow rate. When the user's breathing stabilizes, the control unit prioritizes opening the electromagnetic proportional valve every 10 milliseconds. Due to differences in breathing volume among different users, the detection value of the pulsating pressure sensor will also vary. The control unit 4 optimizes the opening time and speed of the electromagnetic proportional valve 6 based on the detection data of the pulsating pressure sensor to meet the actual needs of different users and provide reasonable oxygen supply.

[0050] The detection values ​​of the first pressure sensor and the second pressure sensor serve as input information for adjusting the speed of the permanent magnet brushless motor and the stepper motor. When the altitude increases, the atmospheric pressure in the environment decreases. The second pressure sensor converts the actual atmospheric pressure detection value into a voltage signal and transmits it to the control unit 4. The control unit 4 outputs a control signal to the permanent magnet brushless motor 32 to increase its speed, thereby increasing the flow of compressed air entering the nitrogen and oxygen separation tower 2 to ensure sufficient oxygen output; when the oxygen demand increases, the pressure in the tank detected by the first pressure sensor decreases, and the oxygen pressure detection value is converted into a voltage signal and transmitted to the control unit 4. The control unit 4 outputs a control signal to the permanent magnet brushless motor 32 to increase its speed, thereby increasing the flow of compressed air entering the nitrogen and oxygen separation tower to ensure sufficient oxygen output and the pressure of the oxygen storage tank. Conversely, when the oxygen demand decreases, the control unit outputs a control signal to the permanent magnet brushless motor to reduce its speed.

[0051] During the operation of the nitrogen-oxygen separation tower 2, after the stepper motor 20 is started, the upper distribution valve 211 is driven to rotate through the gear transmission. After the upper distribution valve 211 rotates, the lower distribution valve 222 is driven to rotate synchronously through the central shaft 24. The compressed air flows into the upper end cover 231 from the air inlet 34. When the upper distribution valve 211 and the lower distribution valve 222 rotate to a certain angle, the compressed air channel 213 is connected with the compressed air hole 215, the vent hole 223 and the oxygen channel 224. The compressed air enters the molecular sieve cylinder 23. The zeolite molecular sieve in the molecular sieve cylinder 23 first adsorbs the nitrogen in the compressed air so that the gas flowing out of the bottom of the molecular sieve cylinder 23 is mainly oxygen. The oxygen is discharged through the vent hole 223 in turn. , oxygen channel 224 and vent hole 223, and then flows out from oxygen outlet 236. When the upper distribution valve 211 and the lower distribution valve 222 continue to rotate a certain angle, the compressed air channel 213 is disconnected from the compressed air hole 215, the vent hole 223 and the oxygen channel 224, and the nitrogen hole 216 is connected to the nitrogen channel 214. Under the continuous suction action of the vacuum pump 33, the nitrogen adsorbed by the zeolite molecular sieve in the molecular sieve cylinder 23 is depressurized and desorbed. The desorbed nitrogen flows out from nitrogen outlet 235 along the nitrogen hole 216, the nitrogen channel 214 and the nitrogen hole 216 in turn. The upper distribution valve 211 and the lower distribution valve 222 are continuously rotated to realize intermittent cyclic oxygen supply and desorption state switching.

[0052] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. An oxygen concentrator, characterized in that: The invention comprises a shell, a nitrogen and oxygen separation tower installed inside the shell, a positive and negative pressure air compressor, an oxygen storage tank, and a control unit. The air inlet and nitrogen outlet of the nitrogen and oxygen separation tower are connected to the positive and negative pressure air compressor, the oxygen outlet of the nitrogen and oxygen separation tower is connected to the oxygen storage tank, the air outlet end of the oxygen storage tank is connected to the air inlet end of the ultrasonic flow meter, the air outlet end of the ultrasonic flow meter, the electromagnetic proportional valve, and the oxygen outlet on the shell are connected in sequence, the oxygen storage tank and the shell are respectively equipped with a first pressure sensor for detecting the oxygen pressure in the tank and a second pressure sensor for detecting the external atmospheric pressure, the oxygen outlet is provided with a pulsating pressure sensor, the first pressure sensor, the second pressure sensor, and the pulsating pressure sensor are all connected to the control unit, the control unit controls the motor speed of the positive and negative pressure air compressor after comparing the pressure detection value fed back by the first pressure sensor or the second pressure sensor with the preset value to achieve continuous high oxygen concentration oxygen output at the oxygen outlet, and the control unit dynamically detects the respiratory pressure difference according to the feedback of the pulsating pressure sensor The opening state of the electromagnetic proportional valve is adjusted to thereby adjust the oxygen output flow rate. A temperature sensor for detecting the internal oxygen temperature is installed inside the ultrasonic flowmeter. The temperature sensor is connected to the control unit. The control unit adjusts the opening state of the electromagnetic proportional valve according to the change in the oxygen temperature detection value of the temperature sensor so that the measurement value of the ultrasonic flowmeter is maintained at a predetermined value. The ultrasonic flowmeter detects the actual output oxygen flow rate and corrects the oxygen output flow rate in real time according to the actual flow value. When the altitude increases or decreases, the second pressure sensor detects that the atmospheric pressure in the environment decreases or increases accordingly. The control unit outputs a control signal to increase or decrease the speed of the positive and negative air compressor motors to adjust the compressed air flow entering the nitrogen and oxygen separation tower. When the first pressure sensor detects that the pressure in the oxygen storage tank decreases or increases, the control unit outputs a control signal to increase or decrease the speed of the positive and negative air compressors to adjust the compressed air flow entering the nitrogen and oxygen separation tower, thereby ensuring sufficient oxygen output and the pressure of the oxygen storage tank.

2. The oxygen concentrator according to claim 1, wherein: The nitrogen and oxygen separation tower includes a stepper motor, a molecular sieve cartridge, an air separation valve assembly and an oxygen separation valve assembly installed at the upper and lower ends of the molecular sieve cartridge, wherein a compressed air path, an oxygen path, and a nitrogen path are formed between the air separation valve assembly, the molecular sieve cartridge, and the oxygen separation valve assembly, the molecular sieve cartridge being provided with an air inlet, a nitrogen outlet, and an oxygen outlet, the air separation valve assembly and the oxygen separation valve assembly being connected by a central shaft, the stepper motor being installed on one side of the molecular sieve cartridge and connected to the upper end of the central shaft by a gear train transmission mechanism, and after the stepper motor drives the central shaft to rotate, the air separation valve assembly and the oxygen separation valve assembly rotate synchronously to change the on-off state between the compressed air path, the oxygen path, and the nitrogen path, thereby realizing intermittent cyclic air supply, oxygen discharge, or desorption state switching of the nitrogen and oxygen separation tower.

3. The oxygen concentrator according to claim 2, wherein: The air separation valve assembly includes an upper distribution valve and an intake valve plate. The upper distribution valve is provided with a compressed air channel and a nitrogen channel. The intake valve plate is provided with a compressed air hole connected to the air inlet and a nitrogen hole connected to the nitrogen outlet. The oxygen separation valve assembly includes an exhaust valve plate and a lower distribution valve. The lower distribution valve is provided with a backflush hole, a flushing hole and an oxygen channel. The exhaust valve plate is provided with a vent connected to the oxygen outlet. Under the action of a driving force, after the upper distribution valve and the lower distribution valve rotate around the central axis, the compressed air channel and the compressed air hole, the nitrogen channel and the nitrogen hole, and the vent and the oxygen channel are connected or disconnected with each other, thereby realizing intermittent cyclic air supply, oxygen discharge or desorption state switching of the nitrogen and oxygen separation tower.

4. The oxygen concentrator according to claim 1, wherein: The positive and negative pressure air compressor includes a permanent magnet brushless motor, an air compressor and a vacuum pump. The air compressor and the vacuum pump are respectively connected to the bidirectional output ends of the permanent magnet brushless motor in a one-to-one correspondence. The air compressor and the vacuum pump are respectively connected to the air inlet and the nitrogen outlet of the nitrogen and oxygen separation tower via air pipes. The permanent magnet brushless motor is equipped with a Hall sensor for detecting the rotational speed, and the Hall sensor is connected to the control unit.

5. The oxygen concentrator according to claim 4, wherein: The vacuum pump is connected to an exhaust pipe, and the exhaust pipe is provided with a muffler.

6. The oxygen concentrator according to claim 4, wherein: An air cooling channel is provided on the housing of the permanent magnet brushless motor, and balancing blocks are installed on both bidirectional output ends of the permanent magnet brushless motor.

7. The oxygen concentrator according to claim 1, wherein: It also includes a power supply, a display operation panel, an integrated drive panel, and a power control panel installed on the shell. The shell is provided with a power positioning seat and a charging socket. The power supply is installed on the power positioning seat. The display operation panel, the integrated drive panel, and the power control panel are all connected to the control unit.

8. The oxygen concentrator according to claim 1 or 7, wherein: The housing comprises a control unit housing and a host housing, the control unit housing and the host housing are connected by a ring and a shock-absorbing ring, and the housing is made of fiber material.

9. The oxygen concentrator according to claim 1, wherein: The oxygen storage tank is closely mounted on the side wall of the positive and negative pressure air compressor, and the opening of the electromagnetic proportional valve adopts feedforward control.

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