Portable oxygen concentrator and method of using the same

Abstract

The present invention discloses a portable oxygen concentrator and a method for using the same. The oxygen concentrator comprises an air pressurizing mechanism, a compressed air buffer tank, a first adsorption cabin, a second adsorption cabin, an oxygen buffer cabin and an air circuit delay switch group; the compressed air buffer tank is respectively connected to the two adsorption cabins through an adsorption air circuit, and the two adsorption cabins are respectively connected to the oxygen buffer cabin through a flushing air circuit and an exhaust air circuit, and the air circuit delay switch group controls the corresponding adsorption air circuit, flushing air circuit, exhaust air circuit and desorption air circuit to be opened and closed respectively by controlling an air circuit regulating member; the air pressurizing mechanism comprises an air pressurizing cabin, a piston and a roller, and the roller is fixedly connected to a rocker arm, and the reciprocating motion of the piston in the air pressurizing cabin can be realized by the rotation of the rocker arm, so that the air is pressed into the compressed air buffer tank. The oxygen concentrator of the present invention has a simple structure, occupies a small space, can provide power in a variety of ways, and can especially produce oxygen in a purely manual manner without the need for electricity.

Description

Technical Field

[0001] The invention relates to the technical field of molecular sieve pressure swing adsorption oxygen production, and in particular to a portable oxygen generator and a use method thereof. Background Art

[0002] Pressure swing adsorption air separation oxygen production uses zeolite molecular sieve as adsorbent and uses the pressure swing adsorption principle (PSA) at room temperature to separate air to produce high-purity oxygen. The principle is based on the fact that the diffusion rates of oxygen and nitrogen gas molecules on the surface of the molecular sieve are different, and the gas molecules with smaller diameters (O 2 ) diffuse faster and enter more of the carbon molecular sieve micropores. Gas molecules with larger diameters (N 2 ) diffusion rate is slow, and less oxygen enters the micropores of the carbon molecular sieve. The difference in the selective adsorption of nitrogen and oxygen by the carbon molecular sieve leads to the enrichment of oxygen in the adsorption phase and nitrogen in the gas phase in a short time, forming oxygen-nitrogen separation, and obtaining gas-phase enriched oxygen. The pressure swing adsorption oxygen production device has the advantages of simplicity and flexibility, low failure rate, easy maintenance, high degree of automation, convenient operation, and low energy consumption. It is suitable for small and medium-sized air separation oxygen production occasions.

[0003] Existing pressure swing adsorption (PSA) oxygen generators basically use micro air compression pumps and various solenoid valves for air circuit control. These devices are inseparable from power supply. When there is a shortage of electricity or no electricity in the wild, these oxygen generators cannot provide oxygen support in an emergency. In addition, existing oxygen generators all use solenoid valves to control the flow direction and pressure balance time of compressed air. However, with the improvement of quality requirements for oxygen generators, the solenoid valves of the existing technology cannot accurately control the time, pressure and flow of compressed air entering the oxygen generator, making it impossible to improve the efficiency of the oxygen generator. At the same time, the existing solenoid valve control method will produce obvious airflow noise due to changes in the flow direction and speed of compressed air when the valve position is changed. Summary of the invention

[0004] In view of the above-mentioned technical problems, the present invention provides a portable oxygen concentrator and a method for using the same.

[0005] The technical solution of the present invention is:

[0006] A portable oxygen concentrator comprises an air pressurizing mechanism, a compressed air buffer tank, a first adsorption cabin, a second adsorption cabin, an oxygen buffer cabin and an air circuit delay switch group;

[0007] The air pressurizing mechanism is connected to the compressed air buffer tank through a pipeline, and the compressed air buffer tank is connected to the first adsorption cabin and the second adsorption cabin respectively through an adsorption gas path, and oxygen-generating molecular sieves are arranged in the two adsorption cabins, and the two adsorption cabins are connected to the oxygen buffer cabin through a flushing gas path respectively, and the two adsorption cabins are also connected to the oxygen buffer cabin through an exhaust gas path respectively, and the two adsorption cabins are respectively provided with a desorption gas path, and the gas path delay switch group controls the corresponding adsorption gas path, flushing gas path, exhaust gas path and desorption gas path to be opened and closed respectively by controlling the gas path regulating member;

[0008] The air pressurization mechanism includes an air pressurization cabin and a piston arranged therein, wherein a roller running chamber and a roller are arranged in the piston, wherein the roller contacts the inner wall of the roller running chamber, and the roller is fixedly connected to a rocker arm, and the rotation of the rocker arm can realize the reciprocating motion of the piston in the air pressurization cabin, thereby compressing the air into a compressed air buffer tank.

[0009] Preferably, the air circuit delay switch group includes a cam group drive shaft and a plurality of rotating cams fixed thereon, the cam group drive shaft is connected to a power mechanism, the rotating cam includes a cam body and at least one protrusion arranged on the outer peripheral surface of the cam body, each of the rotating cams cooperates with at least one air circuit regulating member, and during the rotation of the rotating cam, when the air circuit regulating member abuts against the protrusion, the air circuit is closed, and when the air circuit regulating member is misaligned with the protrusion, the air circuit is opened.

[0010] Preferably, the gas path regulating member comprises a contact and a valve body connected thereto, and during the rotation of the cam, the opening and closing of the valve body are regulated by the contact contacting different positions of the outer side of the cam.

[0011] Preferably, the rocker arm is connected to a piston drive shaft, and the piston drive shaft is transmission-connected to a power mechanism.

[0012] Preferably, the power mechanism includes a main drive shaft and a first speed gear and a second speed gear arranged thereon, the piston drive shaft is provided with a piston drive shaft gear meshing with the first speed gear, and the cam group drive shaft is provided with an air circuit switch group gear meshing with the second speed gear.

[0013] Preferably, the main drive shaft is connected to a hand wheel, and in the absence of electricity, the main drive shaft is driven to rotate by manually operating the hand wheel.

[0014] Preferably, the main drive shaft is connected to a motor, and the motor is powered by a battery, which is a variety of portable batteries, such as a lithium battery, a hydrogen fuel cell, etc.

[0015] Preferably, the longitudinal cross-sectional shape of the roller running cavity is elliptical or approximately elliptical, and the curvature of the curved surface of the shape determines the running speed of the piston; and the major axis direction of the shape is perpendicular to the movement direction of the piston, and the length of the major axis of the shape is the diameter of the rocker arm; the minor axis length of the shape and the diameter of the rocker arm jointly determine the stroke of the piston.

[0016] Preferably, a first outside air one-way valve is provided at the top of the air compression cabin, and the top of the air compression cabin is connected to the compressed air buffer tank through a first connecting pipe, and the first connecting pipe is provided with a first compressed air one-way valve; a second outside air one-way valve is provided at the bottom of the air compression cabin, and the bottom of the air compression cabin is connected to the compressed air buffer tank through a second connecting pipe, and the second connecting pipe is provided with a second compressed air one-way valve.

[0017] Oxygen-generating molecular sieves are ultra-efficient lithium-type molecular sieve particles, or lithium-type molecular sieve composite materials fused with special polymer materials.

[0018] A method for using a portable oxygen concentrator comprises the following steps:

[0019] S1. Use a hand wheel or motor as the power of the power mechanism to drive the main drive shaft so that the power mechanism rotates at a certain speed;

[0020] S2, the power mechanism drives the piston drive shaft through the gear, so that the rocker arm fixed on the piston drive shaft rotates, and the rotation of the rocker arm drives the piston to reciprocate up and down in the air compression cabin, and compresses the air into the compressed air buffer tank;

[0021] S3. At the same time as S2, the power mechanism drives the cam group drive shaft through the gears, so that the rotating cam fixed on the cam group drive shaft starts to work, and controls the corresponding adsorption gas path, flushing gas path, exhaust gas path and desorption gas path to be opened and closed respectively by controlling the gas path regulating member, so that the first adsorption cabin and the second adsorption cabin perform adsorption, flushing, pressure equalization, exhaust and desorption operations in sequence to achieve continuous oxygen production.

[0022] The beneficial effects of the present invention are:

[0023] (1) The oxygen concentrator of the present invention meets the requirements of portability and has a simple structure, using only a single air compression cabin and a single piston, and occupies little space;

[0024] (2) The present invention only has one power mechanism, which occupies a small space. The power mechanism can be used to drive the rocker arm to rotate, thereby driving the air pressurizing mechanism to work, and can also drive the cam group drive shaft to rotate, thereby driving the air circuit delay switch group to work. The power mechanism can provide power in various ways such as a motor and a hand wheel to produce oxygen, especially without electricity, and can produce oxygen in a purely manual way;

[0025] (3) The present invention adopts a cam-type gas circuit delay switch group, and multiple rotating cams are installed on the same axis to realize multi-gas circuit joint timing switch control, and the cam-type gas circuit delay switch group can accurately control the time, pressure and flow of compressed air entering the oxygen generator, which helps to ensure the efficiency of the oxygen generator. During use, the first adsorption cabin and the second adsorption cabin are sequentially adsorbed, flushed, pressure-equalized, exhausted, desorbed, etc. through the gas circuit delay switch group to realize continuous oxygen production;

[0026] (4) The oxygen production efficiency of the oxygen generator of the present invention is 1-100L per minute. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2A It is a side schematic diagram of the air pressurizing mechanism of the present invention;

[0030] Figure 2B It is a front schematic diagram of the air pressurizing mechanism of the present invention;

[0031] Figure 3A It is a side view schematic diagram of another working state of the air pressurizing mechanism of the present invention;

[0032] Figure 3B It is a front view schematic diagram of another working state of the air pressurizing mechanism of the present invention;

[0033] Figure 4 It is a structural schematic diagram of the gas circuit delay switch group of the present invention;

[0034] Figure 5 It is a schematic diagram of the cam controlling the opening and closing of a gas path of the present invention;

[0035] Figure 6 Another schematic diagram of the cam controlling the opening and closing of a gas path of the present invention;

[0036] Figure 7 It is a schematic diagram of the cam controlling the opening and closing of multiple gas paths of the present invention;

[0037] Figure 8 This is a control timing diagram of the gas circuit delay switch group of the present invention controlling the opening and closing of multiple gas circuits.

[0038] The markings in the figure are: 1. hand wheel; 2. first speed change gear; 3. air circuit switch group gear; 4. piston drive shaft gear; 5. second speed change gear; 6. air circuit delay switch group; 7. rocker arm; 8. air pressurization cabin; 9. piston drive shaft; 10. first outside air one-way valve; 11. second outside air one-way valve; 12. first compressed air one-way valve; 13. second compressed air one-way valve; 14. compressed air buffer tank; 15. first adsorption valve; 16. second adsorption valve; 17. first desorption valve; 18. second desorption valve; 19. first adsorption cabin; 20. second adsorption cabin; 21. equalizing valve; 22. first flushing valve; 23. second flushing valve; 24. oxygen buffer cabin; 25. first exhaust valve; 26. oxygen outlet; 27. second exhaust valve; 28. piston; 29. ​​roller; 30. roller running chamber; 31. main drive shaft; 32. cam group drive shaft. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0040] like Figure 1 As shown, a portable oxygen generator includes an air pressurizing mechanism, a compressed air buffer tank 14, a first adsorption cabin 19, a second adsorption cabin 20, an oxygen buffer cabin 24 and an air circuit delay switch group 6, and oxygen generating molecular sieves are provided in both adsorption cabins.

[0041] The compressed air buffer tank 14 is connected to the first adsorption cabin 19 through a first adsorption gas path, the first adsorption gas path is provided with a first adsorption valve 15, the first adsorption cabin 19 is connected to a first desorption gas path, the first desorption gas path is provided with a first desorption valve 17; the compressed air buffer tank 14 is connected to the second adsorption cabin 20 through a second adsorption gas path, the second adsorption gas path is provided with a second adsorption valve 16, the second adsorption cabin 20 is connected to a second desorption gas path, and the second desorption gas path is provided with a second desorption valve 18.

[0042] The first adsorption cabin 19 is connected to the oxygen buffer cabin 24 through a first flushing gas circuit and a first exhaust gas circuit, the first flushing gas circuit is provided with a first flushing valve 22, and the first exhaust gas circuit is provided with a first exhaust valve 25; the second adsorption cabin 20 is connected to the oxygen buffer cabin 24 through a second flushing gas circuit and a second exhaust gas circuit, the second flushing gas circuit is provided with a second flushing valve 23, and the second exhaust gas circuit is provided with a second exhaust valve 27; the first flushing gas circuit, the first exhaust gas circuit, the second flushing gas circuit and the second exhaust gas circuit are connected through a pressure equalizing gas circuit, and the pressure equalizing gas circuit is provided with a pressure equalizing valve 21.

[0043] The oxygen buffer compartment 24 is provided with an oxygen outlet 26 for supplying oxygen.

[0044] The gas circuit delay switch group 6 controls the opening and closing of the corresponding adsorption gas circuit, flushing gas circuit, exhaust gas circuit and desorption gas circuit respectively by controlling the gas circuit regulating member.

[0045] The air pressurization mechanism includes an air pressurization cabin 8, a first outside air one-way valve 10 is provided on the top of the air pressurization cabin 8, and the top of the air pressurization cabin 8 is connected to the compressed air buffer tank 14 through a first connecting pipe, and the first connecting pipe is provided with a first compressed air one-way valve 12; a second outside air one-way valve 11 is provided at the bottom of the air pressurization cabin 8, and the bottom of the air pressurization cabin 8 is connected to the compressed air buffer tank 14 through a second connecting pipe, and the second connecting pipe is provided with a second compressed air one-way valve 13.

[0046] A piston 28 is provided in the air compression chamber 8, and a roller running chamber 30 is provided in the piston 28. The longitudinal cross section of the roller running chamber 30 is elliptical, and the long axis direction of the ellipse is perpendicular to the movement direction of the piston 28. A roller 29 is provided in the roller running chamber 30, and the roller 29 contacts the inner wall of the roller running chamber 30. The roller 29 is fixedly connected to the rocker arm 7, and the rocker arm 7 is connected to the piston drive shaft 9, and the piston drive shaft 9 is connected to the power mechanism. The reciprocating motion of the piston 28 in the air compression chamber 8 can be realized by the rotation of the rocker arm 7. Figure 2A and 2B As shown, the piston 28 moves upward under the drive of the rocker arm 7, and the air above the piston 28 is pressed into the compressed air buffer tank 14, as shown in FIG. Figure 3A and 3B As shown, the piston 28 moves under the drive of the rocker arm 7, and the air below the piston 28 is compressed into the compressed air buffer tank 14. During the reciprocating motion of the piston 28, the roller 29 is always in contact with the inner wall of the roller running chamber 30.

[0047] like Figure 4 As shown, the air circuit delay switch group 6 includes a cam group drive shaft 32, and the cam group drive shaft 32 is connected to the power mechanism. The cam group drive shaft 32 is provided with a plurality of rotating cams, and the rotating cam includes a cam body and a raised portion provided on the outer peripheral surface of the cam body. Each rotating cam cooperates with at least one air circuit regulating member. During the rotation of the rotating cam, when the air circuit regulating member abuts against the raised portion, the air circuit is closed, and when the air circuit regulating member is misaligned with the raised portion, the air circuit is opened. Specifically, the air circuit regulating member includes a contact and a valve body. During the rotation of the cam, the opening and closing of the valve body are adjusted by the contact contacting different positions of the outer side of the cam. For a cam with only one raised portion, the cam cooperates with an air circuit regulating member, and the time required for the opening and closing of the air circuit channel within a rotation cycle can be adjusted by controlling the ratio of the length of the raised portion to the corresponding circumference. For example Figure 5As shown in the figure, the length of the raised part is half of the corresponding circumference, so in one cycle, 50% of the time is closed and 50% of the time is open. If one rotation takes 10 seconds, the gas path is controlled to be open for 5 seconds and closed for 5 seconds; or Figure 6 As shown in the figure, the length of the protrusion is 25% of the corresponding circumference, so in one cycle, 25% of the time is closed and 75% of the time is open. If it takes 10 seconds to rotate one circle, the control is open for 7.5 seconds, closed for 2.5 seconds, and open for 4.5 seconds. In addition, Figure 7 As shown, a single rotating cam can cooperate with multiple gas circuit control components, so that the opening and closing of multiple gas circuits can be controlled by a single cam. The cam-type gas circuit delay switch group can accurately control the time, pressure and flow of compressed air entering the oxygen concentrator, which helps to ensure the efficiency of the oxygen concentrator.

[0048] like Figure 1 As shown, the power mechanism includes a main drive shaft 31, the main drive shaft 31 is provided with a first speed gear 2 and a second speed gear 5, the piston drive shaft 9 is provided with a piston drive shaft gear 4 meshing with the first speed gear 2, and the cam group drive shaft 32 is provided with an air circuit switch group gear 3 meshing with the second speed gear 5. The piston drive shaft 9 is driven to rotate by the first speed gear 2 meshing with the piston drive shaft gear 4, and then the roller 29 is driven to roll. The cam group drive shaft 32 is driven to rotate by the second speed gear 5 meshing with the air circuit switch group gear 3. The main drive shaft 31 is connected to the hand wheel 1. In the absence of electricity, the main drive shaft 31 is driven to rotate by manually operating the hand wheel 1. The main drive shaft 31 can also be connected to a motor, and the motor is powered by a battery, which is a variety of portable batteries, such as lithium batteries, hydrogen fuel cells, etc. This embodiment only has one power mechanism, which occupies a small space. The power mechanism can be used to drive the rocker arm 7 to rotate, thereby driving the air pressurizing mechanism to work, and can also drive the cam group drive shaft 32 to rotate, thereby driving the air circuit delay switch group 6 to work. The power mechanism can provide power through a variety of methods such as a motor and a hand wheel 1 to produce oxygen.

[0049] In a preferred embodiment of the present application, 9 rotating cams are provided on the cam group drive shaft 32, and each rotating cam cooperates with an air circuit adjustment component to respectively control the air circuit opening and closing of the first adsorption valve 15, the second adsorption valve 16, the first desorption valve 17, the second desorption valve 18, the pressure equalizing valve 21, the first flushing valve 22, the second flushing valve 23, the first exhaust valve 25 and the second exhaust valve 27.

[0050] The portable oxygen concentrator of this embodiment uses the principle of pressure swing adsorption to separate air and produce high-purity oxygen. The oxygen-producing molecular sieve used is ultra-efficient lithium molecular sieve particles, or lithium molecular sieve composite materials fused with special polymer materials. In this embodiment, the first adsorption cabin 19 is used as the A unit, the second adsorption cabin 20 is used as the B unit, and the air circuit delay switch group 6 is used to control the opening and closing of multiple air circuits. The process of controlling according to the time sequence is as follows: Figure 8 As shown. The oxygen concentrator of this embodiment meets the portability requirement and has a simple structure. It only uses a single air pressurization cabin 8 and a single piston 28, and occupies a small space. This embodiment adopts a cam-type gas circuit delay switch group 6, and multiple rotating cams are installed on the same axis to realize multi-gas circuit joint timing switch control. During use, the gas circuit delay switch group 6 enables the first adsorption cabin 19 and the second adsorption cabin 20 to perform adsorption, flushing, pressure equalization, exhaust, desorption and other operations in turn to achieve continuous oxygen production. The oxygen production efficiency of the oxygen concentrator of this embodiment is 1-100L per minute. The portable oxygen concentrator of this embodiment is used as follows:

[0051] S1, using the hand wheel 1 or the motor as the power to drive the main drive shaft 31, so that the power mechanism rotates at a certain speed;

[0052] S2, the power mechanism drives the piston drive shaft 9 to rotate the rocker arm 7 fixed on the piston drive shaft 9, and then the rotation of the rocker arm 7 drives the piston 28 to reciprocate up and down in the air compression cabin 8, and compresses the air into the compressed air buffer tank 14;

[0053] S3. At the same time as S2, the power mechanism drives the cam group drive shaft 32 to rotate, thereby driving the gas circuit delay switch group 6 to start working, and controls the corresponding adsorption gas circuit, flushing gas circuit, exhaust gas circuit and desorption gas circuit to be opened and closed respectively by controlling the gas circuit adjustment member, so that the first adsorption cabin 19 and the second adsorption cabin 20 perform adsorption, flushing, pressure equalization, exhaust and desorption operations in sequence, with 10s as a cycle. The specific process is as follows:

[0054] At 0-2.5s, the first adsorption valve 15 and the first exhaust valve 25 are opened, the second desorption valve 18 is also opened, and the other valves are closed. The pressure in the first adsorption cabin 19 is increased to perform adsorption operation, and the desorption operation is performed in the second adsorption cabin 20;

[0055] At 2.5-4s, the first adsorption valve 15 and the first exhaust valve 25 continue to be opened, the second flushing valve 23 and the second desorption valve 18 are also opened, and the other valves are closed, the adsorption operation continues in the first adsorption cabin 19, and the desorption operation and flushing operation are carried out in the second adsorption cabin 20;

[0056] At 4-5s, in the first 0.5s, the pressure equalizing valve 21 is opened, and the other valves are closed. In the last 0.5s, the pressure equalizing valve 21 is closed, and the second exhaust valve 27 and the first desorption valve 17 are opened, so that the pressure equalization operation is performed, the pressure in the first adsorption cabin 19 is reduced, and the pressure in the second adsorption cabin 20 is increased;

[0057] At 5-7.5s, the second adsorption valve 16 and the second exhaust valve 27 are opened, the first adsorption valve 15 is also opened, and the other valves are closed. The pressure in the second adsorption cabin 20 is increased to perform adsorption operation, and the first adsorption cabin 19 performs desorption operation;

[0058] At 7.5-9s, the second adsorption valve 16 and the second exhaust valve 27 continue to be opened, the first flushing valve 22 and the first desorption valve 17 are also opened, and the other valves are closed, the adsorption operation continues in the second adsorption cabin 20, and the desorption operation and flushing operation are carried out in the first adsorption cabin 19;

[0059] At 9-10 seconds, in the first 0.5 seconds, the pressure equalizing valve 21 is opened, and the other valves are closed. In the last 0.5 seconds, the pressure equalizing valve 21 is closed, and the first exhaust valve 25 and the second desorption valve 18 are opened to perform pressure equalization. The pressure in the second adsorption cabin 20 is reduced, and the pressure in the first adsorption cabin 19 is increased.

[0060] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A portable oxygen concentrator, It is characterized in that It comprises an air pressurizing mechanism, a compressed air buffer tank (14), a first adsorption chamber (19), a second adsorption chamber (20), an oxygen buffer chamber (24) and an air circuit delay switch group (6); The air pressurizing mechanism is connected to the compressed air buffer tank (14) through a pipeline, and the compressed air buffer tank (14) is connected to the first adsorption chamber (19) and the second adsorption chamber (20) through an adsorption gas path. The two adsorption chambers are provided with oxygen-generating molecular sieves. The two adsorption chambers are connected to the oxygen buffer chamber (24) through a flushing gas path. The two adsorption chambers are also connected to the oxygen buffer chamber (24) through an exhaust gas path. The two adsorption chambers are provided with desorption gas paths. The gas path delay switch group (6) controls the corresponding adsorption gas path, flushing gas path, exhaust gas path and desorption gas path to be opened and closed respectively by controlling the gas path regulating element. The air path delay switch group (6) comprises a cam group drive shaft (32) and a plurality of rotating cams fixed thereon, the cam group drive shaft (32) is connected to the power mechanism, the rotating cam comprises a cam body and at least one protrusion provided on the outer peripheral surface of the cam body, each rotating cam cooperates with at least one of the air path regulating members, and during the rotation of the rotating cam, when the air path regulating member abuts against the protrusion, the air path is closed, and when the air path regulating member is misaligned with the protrusion, the air path is opened; The air pressurizing mechanism comprises an air pressurizing chamber (8) and a piston (28) arranged therein; a roller running chamber (30) and a roller (29) are arranged in the piston (28); the roller (29) contacts the inner wall of the roller running chamber (30); the roller (29) is fixedly connected to the rocker arm (7); the rotation of the rocker arm (7) can realize the reciprocating motion of the piston (28) in the air pressurizing chamber (8), thereby compressing the air into the compressed air buffer tank (14).

2. The portable oxygen concentrator according to claim 1, It is characterized in that The gas path regulating member comprises a contact and a valve body connected thereto. During the rotation of the cam, the opening and closing of the valve body are regulated by the contact contacting different positions of the outer side of the cam.

3. The portable oxygen concentrator according to claim 1, It is characterized in that The rocker arm (7) is connected to a piston drive shaft (9), and the piston drive shaft (9) is transmission-connected to the power mechanism.

4. The portable oxygen concentrator according to claim 3, It is characterized in that The power mechanism comprises a main drive shaft (31) and a first speed change gear (2) and a second speed change gear (5) arranged thereon; the piston drive shaft (9) is provided with a piston drive shaft gear (4) meshing with the first speed change gear (2); and the cam group drive shaft is provided with an air circuit switch group gear (3) meshing with the second speed change gear (5).

5. The portable oxygen concentrator according to claim 4, It is characterized in that The main drive shaft (31) is connected to the hand wheel (1), and in the absence of electricity, the main drive shaft is driven to rotate by manually operating the hand wheel.

6. The portable oxygen concentrator according to claim 4, It is characterized in that The main drive shaft (31) is connected to a motor, and the motor is powered by a battery.

7. The portable oxygen concentrator according to claim 1, It is characterized in that The longitudinal cross-section of the roller running chamber (30) is elliptical or approximately elliptical, and the curvature of the curved surface of the shape determines the running speed of the piston (28); the major axis direction of the shape is perpendicular to the moving direction of the piston (28), and the length of the major axis of the shape is the diameter of the rocker arm (7); the minor axis length of the shape and the diameter of the rocker arm (7) together determine the stroke of the piston.

8. The portable oxygen concentrator according to claim 1, It is characterized in that A first outside air check valve (10) is provided at the top of the air compression cabin (8), and the top of the air compression cabin (8) is connected to a compressed air buffer tank (14) via a first connecting pipe, and the first connecting pipe is provided with a first compressed air check valve (12); a second outside air check valve (11) is provided at the bottom of the air compression cabin (8), and the bottom of the air compression cabin (8) is connected to the compressed air buffer tank (14) via a second connecting pipe, and the second connecting pipe is provided with a second compressed air check valve (13).

9. A method for using a portable oxygen concentrator according to any one of claims 4 to 6, It is characterized in that The steps include: S1. Use a hand wheel or motor as the power of the power mechanism to drive the main drive shaft so that the power mechanism rotates at a certain speed; S2, the power mechanism drives the piston drive shaft through the gear, so that the rocker arm fixed on the piston drive shaft rotates, and the rotation of the rocker arm drives the piston to reciprocate up and down in the air compression cabin, and compresses the air into the compressed air buffer tank; S3. At the same time as S2, the power mechanism drives the cam group drive shaft through the gears, so that the rotating cam fixed on the cam group drive shaft starts to work, and controls the corresponding adsorption gas path, flushing gas path, exhaust gas path and desorption gas path to be opened and closed respectively by controlling the gas path regulating member, so that the first adsorption cabin and the second adsorption cabin perform adsorption, flushing, pressure equalization, exhaust and desorption operations in sequence to achieve continuous oxygen production.

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