Molecular sieve cartridge assembly and oxygen concentrator

Abstract

The present invention discloses a molecular sieve cartridge assembly and an oxygen concentrator, comprising a first molecular sieve cartridge, a second molecular sieve cartridge, a first air path plate and a second air path plate, the first molecular sieve cartridge having a first air port and a second air port; the second molecular sieve cartridge having a third air port and a fourth air port; the first air path plate is connected to the first air port and the third air port, the first air path plate is provided with an air source port and an exhaust port, the air source port is used to connect to an air intake source, the exhaust port is used to connect to the atmosphere, one of the first air port and the third air port is connected to the air source port, and the other is connected to the exhaust port; the second air path plate is connected to the second air port and the fourth air port, the second air path plate is provided with an oxygen exhaust port, and the second air port, the fourth air port and the oxygen exhaust port are connected to each other. The two molecular sieve cartridges of the present invention are connected through two air path plates, and the on-off between the air ports is controlled to achieve that one of the two molecular sieve cartridges is in a state of adsorbing nitrogen and the other is in a state of desorbing nitrogen. The structure of the present application is simple and reduces costs.

Description

Technical Field

[0001] The present invention relates to the technical field of oxygen production equipment, in particular to a molecular sieve cartridge assembly and an oxygen generator. Background Art

[0002] The molecular sieve cartridge is the heart of the oxygen concentrator. It houses a molecular oxygen sieve to separate nitrogen and oxygen. In the prior art, to desorb nitrogen from the molecular oxygen sieve, a flushing gas source and flushing pipeline are required, complicating the oxygen concentrator and increasing costs. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a molecular sieve cartridge assembly that can achieve a simple structure.

[0004] According to the molecular sieve cartridge assembly of the first aspect of the present invention, the molecular sieve cartridge assembly includes a first molecular sieve cartridge, a second molecular sieve cartridge, a first air circuit plate and a second air circuit plate, the first molecular sieve cartridge has a first air port and a second air port; the second molecular sieve cartridge has a third air port and a fourth air port; the first air circuit plate is connected to the first air port and the third air port, the first air circuit plate is provided with an air source port and an exhaust port, the air source port is used to connect to an air intake source, the exhaust port is used to connect to the atmosphere, one of the first air port and the third air port is connected to the air source port, and the other is connected to the exhaust port; the second air circuit plate is connected to the second air port and the fourth air port, the second air circuit plate is provided with an oxygen exhaust port, the second air port, the fourth air port and the oxygen exhaust port are connected to each other.

[0005] According to the molecular sieve cartridge assembly of the embodiment of the present invention, there are at least the following beneficial effects: the present invention connects the first molecular sieve cartridge and the second molecular sieve cartridge through the first gas path plate and the second gas path plate, and controls the on-off between multiple gas ports to achieve that one of the first molecular sieve cartridge and the second molecular sieve cartridge is in a state of adsorbing nitrogen and the other is in a state of desorbing nitrogen. For example, part of the oxygen filtered by the first molecular sieve cartridge is stored in the oxygen storage device, and part of the oxygen enters the second molecular sieve cartridge through the second gas path plate to flush the second molecular sieve cartridge, that is, the oxygen with a certain pressure produced by the first molecular sieve cartridge is used to flush the second molecular sieve cartridge. Compared with the existing molecular sieve cartridge assembly that requires an additional flushing gas source and flushing pipeline, the structure of the present application is simple and the cost is reduced.

[0006] According to some embodiments of the present invention, the first air circuit plate is provided with a first valve, a second valve, a third valve and a fourth valve, the first valve is used to control the connection and disconnection between the first air port and the air source port, the second valve is used to control the connection and disconnection between the first air port and the exhaust port, the third valve is used to control the connection and disconnection between the third air port and the air source port, and the fourth valve is used to control the connection and disconnection between the third air port and the exhaust port.

[0007] According to some embodiments of the present invention, a one-way valve is provided at the oxygen exhaust port, and the second air circuit board is provided with a fifth valve. The valve core of the fifth valve is located in the air channel of the second air circuit board, and the valve core can move towards or away from the second air port or the fourth air port.

[0008] According to some embodiments of the present invention, two fifth valves are provided, wherein one of the fifth valves is located at one side of the second gas port, and the other of the fifth valves is located at one side of the fourth gas port.

[0009] According to some embodiments of the present invention, the first gas circuit board is provided with a pressure detection port.

[0010] According to some embodiments of the present invention, the first valve, the second valve, the third valve, the fourth valve, and the fifth valve are all solenoid valves.

[0011] According to some embodiments of the present invention, the second air circuit plate has a first plate and a second plate, the first plate and the second plate are detachably fixedly connected, a sealing gasket is provided between the first plate and the second plate, the second air port is connected to the fourth air port through the second plate, the second air port is connected to the oxygen exhaust port through the first plate, and the fourth air port is connected to the oxygen exhaust port through the first plate.

[0012] According to some embodiments of the present invention, the first air circuit plate is provided with a fifth air port, a sixth air port, a seventh air port and an eighth air port, the fifth air port and the sixth air port are both communicated with the first air port, the fifth air port is communicated with the air source port, the sixth air port is communicated with the exhaust port, the seventh air port and the eighth air port are both communicated with the third air port, the seventh air port is communicated with the air source port, and the eighth air port is communicated with the exhaust port; the second air circuit plate is provided with a ninth air port, a tenth air port, an eleventh air port and a twelfth air port that are communicated with each other, the ninth air port and the tenth air port are both communicated with the second air port, the eleventh air port and the twelfth air port are both communicated with the fourth air port, and two oxygen exhaust ports are provided, and the two oxygen exhaust ports are located between the ninth air port and the eleventh air port.

[0013] According to some embodiments of the present invention, an oxygen reservoir is further included, wherein the oxygen reservoir is located between the first molecular sieve cartridge and the second molecular sieve cartridge, and an air inlet of the oxygen reservoir is communicated with the oxygen exhaust port.

[0014] An oxygen concentrator according to a second embodiment of the present invention includes the molecular sieve cartridge assembly according to the first embodiment of the present invention.

[0015] The slide rail according to the embodiment of the present invention has at least the following beneficial effects: by adopting the above-mentioned molecular sieve cartridge assembly, the structure is simple and the cost is low.

[0016] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0018] Figure 1 1 is a perspective schematic diagram of a molecular sieve cartridge assembly provided in an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 An exploded schematic diagram of a molecular sieve cartridge assembly is shown;

[0020] Figure 3 yes Figure 1 The structural diagram of the first gas circuit board shown;

[0021] Figure 4 yes Figure 1 A first cross-sectional schematic diagram of the second gas path plate shown;

[0022] Figure 5 yes Figure 3 A first cross-sectional schematic diagram of the first gas circuit board shown;

[0023] Figure 6 yes Figure 3 A second cross-sectional schematic diagram of the first gas circuit board shown;

[0024] Figure 7 yes Figure 3 A third cross-sectional schematic diagram of the first gas circuit board shown;

[0025] Figure 8 yes Figure 3 The fourth cross-sectional schematic diagram of the first gas circuit board shown;

[0026] Figure 9 yes Figure 4 A second cross-sectional schematic diagram of the second gas circuit board shown;

[0027] Figure 10 yes Figure 4 The third cross-sectional schematic diagram of the second gas circuit plate is shown.

[0028] Reference numerals:

[0029] First molecular sieve cartridge 100, first gas port 110, second gas port 120, second molecular sieve cartridge 200, third gas port 210, fourth gas port 220, first gas manifold plate 300, gas source port 310, fifth gas port 330, sixth gas port 340, seventh gas port 350, eighth gas port 360, pressure detection port 370, second gas manifold plate 400, oxygen exhaust port 410, ninth gas port 420, tenth gas port 430, eleventh gas port 440, twelfth gas port 450, first plate 460, second plate 470, sealing gasket 480, molecular oxygen generator 500, first valve 610, second valve 620, third valve 630, fourth valve 640, fifth valve 650, oxygen reservoir 700, oxygen outlet solenoid valve 710, sealing ring 800, and one-way valve 900. DETAILED DESCRIPTION

[0030] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0033] Reference below Figures 1 to 10A molecular sieve cartridge assembly according to an embodiment of the first aspect of the present invention is described. The molecular sieve cartridge assembly includes a first molecular sieve cartridge 100, a second molecular sieve cartridge 200, a first air path plate 300, and a second air path plate 400. The first molecular sieve cartridge 100 has a first air port 110 and a second air port 120; the second molecular sieve cartridge 200 has a third air port 210 and a fourth air port 220; the first air path plate 300 is connected to the first air port 110 and the third air port 210, and the first air path plate 300 is provided with an air source port 310 and an exhaust port (not shown in the figure). The air source port 310 is used to connect to an air intake source, and the exhaust port is used to connect to the atmosphere. One of the first air port 110 and the third air port 210 is connected to the air source port 310, and the other is connected to the exhaust port; the second air path plate 400 is connected to the second air port 120 and the fourth air port 220, and the second air path plate 400 is provided with an oxygen exhaust port 410. The second air port 120, the fourth air port 220, and the oxygen exhaust port 410 are connected to each other.

[0034] Molecular oxygen sieve 500 is provided in both the first molecular sieve cartridge 100 and the second molecular sieve cartridge 200 . The first gas port 110 and the second gas port 120 are respectively located at the upper and lower sides of the molecular oxygen sieve 500 . The third gas port 210 and the fourth gas port 220 are respectively located at the upper and lower sides of the molecular oxygen sieve 500 .

[0035] The first gas circuit plate 300 is provided with a fifth gas port 330, a sixth gas port 340, a seventh gas port 350 and an eighth gas port 360. The fifth gas port 330 and the sixth gas port 340 are both connected to the first gas port 110, the fifth gas port 330 is connected to the gas source port 310, the sixth gas port 340 is connected to the exhaust port, the seventh gas port 350 and the eighth gas port 360 are both connected to the third gas port 210, the seventh gas port 350 is connected to the gas source port 310, and the eighth gas port 360 is connected to the exhaust port.

[0036] The second gas circuit plate 400 is provided with a ninth gas port 420, a tenth gas port 430, an eleventh gas port 440 and a twelfth gas port 450 that are interconnected. The ninth gas port 420 and the tenth gas port 430 are both connected to the second gas port 120, and the eleventh gas port 440 and the twelfth gas port 450 are both connected to the fourth gas port 220. Two oxygen exhaust ports 410 are provided, and the two oxygen exhaust ports 410 are located between the ninth gas port 420 and the eleventh gas port 440.

[0037] Multiple air passages are provided in the first air passage plate 300 and the second air passage plate 400, and the ends of some air passages are closed with plugs. The present invention connects the first molecular sieve cartridge 100 and the second molecular sieve cartridge 200 through the first air passage plate 300 and the second air passage plate 400, and controls the on-off between multiple air ports to achieve that one of the first molecular sieve cartridge 100 and the second molecular sieve cartridge 200 is in a state of adsorbing nitrogen and the other is in a state of desorbing nitrogen. For example, if the first air port 110 of the first molecular sieve cartridge 100 is connected to the air source port 310, the first molecular sieve cartridge 100 is in a working state of adsorbing nitrogen, and if the third air port 210 of the second molecular sieve cartridge 200 is connected to the exhaust port, the second molecular sieve cartridge 200 is in a state of desorbing nitrogen. After being filtered by the first molecular sieve cartridge 100, part of the oxygen is stored in the oxygen storage device 700, and part of the oxygen enters the second molecular sieve cartridge 200 through the second gas path plate 400 to flush the second molecular sieve cartridge 200, that is, the oxygen with a certain pressure produced by the first molecular sieve cartridge 100 is used to flush the second molecular sieve cartridge 200, and the mixed gas of nitrogen and oxygen in the second molecular sieve cartridge 200 is finally discharged to the atmosphere from the exhaust port. Compared with the existing molecular sieve cartridge assembly that requires an additional flushing gas source and flushing pipeline, the structure of the present application is simple and the cost is reduced.

[0038] In some specific embodiments of the present invention, reference Figure 2-10 The first gas circuit board 300 is provided with a first valve 610, a second valve 620, a third valve 630 and a fourth valve 640. The first valve 610 is used to control the on-off of the first gas port 110 and the gas source port 310, the second valve 620 is used to control the on-off of the first gas port 110 and the exhaust port, the third valve 630 is used to control the on-off of the third gas port 210 and the gas source port 310, and the fourth valve 640 is used to control the on-off of the third gas port 210 and the exhaust port. The on-off between multiple gas ports is controlled by valves, the structure is simple, the control method is also simple, and the cost is low.

[0039] In some specific embodiments of the present invention, reference Figure 2-10The oxygen exhaust port 410 is equipped with a one-way valve 900, and the second air manifold plate 400 is equipped with a fifth valve 650. The valve core of the fifth valve 650 is located in the air passage of the second air manifold plate 400 and can move toward or away from the second air port 120 or the fourth air port 220. By adding the fifth valve 650, the valve core of the fifth valve 650 is equivalent to the piston of a cylinder, and the valve body of the fifth valve 650 is equivalent to the cylinder body. The valve core of the fifth valve 650 can change the volume of the air passage where the valve core of the fifth valve 650 is located, thereby changing the air pressure in the air passage where the valve core of the fifth valve 650 is located. This not only compresses the oxygen in the second air manifold plate 400, increasing the oxygen pressure and enhancing the flushing effect, but also ensures that all oxygen in the second air manifold plate 400 is discharged, improving the oxygen production effect. The oxygen exhaust port 410 is equipped with a one-way valve to prevent oxygen backflow.

[0040] In some specific embodiments of the present invention, reference Figure 2-10 There are two fifth valves 650, one of which is located on the side of the second gas port 120, and the other is located on the side of the fourth gas port 220, to further improve the flushing effect and oxygen production effect.

[0041] In some specific embodiments of the present invention, reference Figure 2-10 The first gas circuit board 300 is provided with a pressure detection port 370 for obtaining the gas pressure state inside the first gas circuit board 300 .

[0042] In some specific embodiments of the present invention, the first valve 610 , the second valve 620 , the third valve 630 , the fourth valve 640 and the fifth valve 650 are all solenoid valves, which facilitate remote control of the working status of the valves.

[0043] In some specific embodiments of the present invention, reference Figure 2 The first and second molecular sieve cartridges 100 and 200 are both sealed to the first gas manifold plate 300, and the first and second molecular sieve cartridges 100 and 200 are both sealed to the second gas manifold plate 400 to prevent air leakage that could affect oxygen production efficiency. Specifically, sealing rings 800 are provided at the upper and lower ends of the first and second molecular sieve cartridges 100 and 200, respectively.

[0044] In some specific embodiments of the present invention, reference Figure 1-2 The first molecular sieve cartridge 100 and the second molecular sieve cartridge 200 are arranged in parallel, the first gas path plate 300 is fixedly installed at the bottom of the first molecular sieve cartridge 100 and the second molecular sieve cartridge 200, and the second gas path plate 400 is fixedly installed at the top of the first molecular sieve cartridge 100 and the second molecular sieve cartridge 200. The structure is compact and the occupied space is reduced.

[0045] In some specific embodiments of the present invention, reference Figure 1-2The second gas circuit plate 400 has a first plate 460 and a second plate 470, which are detachably fixedly connected. A sealing gasket 480 is provided between the first plate 460 and the second plate 470. The second gas port 120 is connected to the fourth gas port 220 through the second plate 470, the second gas port 120 is connected to the oxygen exhaust port 410 through the first plate 460, and the fourth gas port 220 is connected to the oxygen exhaust port 410 through the first plate 460. The second gas circuit plate 400 is configured as two plates for easy manufacturing and maintenance.

[0046] In some specific embodiments of the present invention, reference Figure 2 , also includes an oxygen storage device 700, which is located between the first molecular sieve cartridge 100 and the second molecular sieve cartridge 200. The air inlet of the oxygen storage device 700 is connected to the oxygen outlet 410 through a one-way valve 900, thereby reducing the oxygen transportation distance and preventing the oxygen in the oxygen storage device 700 from flowing back.

[0047] An oxygen concentrator (not shown in the figures) according to an embodiment of the second aspect of the present invention comprises a molecular sieve cartridge assembly according to any embodiment of the first aspect of the present invention.

[0048] The oxygen concentrator according to the embodiment of the present invention adopts the above-mentioned molecular sieve cartridge assembly, so it has a simple structure and low cost.

[0049] The working principle of the molecular sieve cartridge assembly of the present invention is described below: the first valve 610 is controlled to open, the second valve 620 is closed, the third valve 630 is closed, and the fourth valve 640 is opened, and then compressed air is introduced into the gas source port 310 of the first gas circuit board 300, such as Figure 5-6 , the first gas port 110 is connected to the gas source port 310, as shown Figure 7 All the compressed air enters the flushed first molecular sieve cartridge 100 through the first air port 110. After the compressed air passes through the molecular oxygen sieve 500 of the first molecular sieve cartridge 100, the nitrogen is adsorbed onto the molecular oxygen sieve 500 of the first molecular sieve cartridge 100, and the filtered oxygen enters the second air path plate 400 through the second air port 120, the ninth air port 420 and the tenth air port 430. Then, a portion of the oxygen enters the oxygen storage 700 through the oxygen exhaust port 410 and the one-way valve. Figure 9 , is stored for future use, and the other part of the oxygen enters the second molecular sieve cartridge 200 through the eleventh gas port 440, the twelfth gas port 450 and the fourth gas port 220. Figure 10 , and flush the second molecular sieve cartridge 200, the nitrogen on the molecular oxygen sieve 500 of the second molecular sieve cartridge 200 is desorbed (i.e., nitrogen desorbs the molecular oxygen sieve 500), and the mixed gas of desorbed nitrogen and oxygen enters the first gas path plate 300 through the second gas port 120, as shown Figure 8, and then discharged into the atmosphere through the exhaust port. At the same time, in order to pressurize the oxygen in the second gas manifold plate 400, the valve cores of the two fifth valves 650 move toward the second gas port 120 and the fourth gas port 220 to compress the oxygen in the second gas manifold plate 400, so as to fully flush the second molecular sieve cartridge 200 and empty the oxygen in the second gas manifold plate 400, thereby realizing the oxygen production of the first molecular sieve cartridge 100 and the flushing of the second molecular sieve cartridge 200. After a period of time (for example, a few seconds), the molecular oxygen sieve 500 of the first molecular sieve cartridge 100 adsorbs nitrogen to a saturated state, the first valve 610 is controlled to be closed, the second valve 620 is opened, the third valve 630 is opened, and the fourth valve 640 is closed, and the compressed air all enters the flushed second molecular sieve cartridge 200 through the third gas port 210. After the compressed air passes through the molecular oxygen sieve 500 of the second molecular sieve cartridge 200, the nitrogen is adsorbed onto the molecular oxygen sieve 500 of the second molecular sieve cartridge 200, and the filtered oxygen enters the second gas path plate 400 through the fourth gas port 220, the eleventh gas port 440, and the twelfth gas port 450, and then a part of the oxygen enters the oxygen storage 700 through the oxygen exhaust port 410 and the one-way valve, and is stored for standby use, and the other part of the oxygen enters the first molecular sieve cartridge 100 through the eighth gas port 360, the ninth gas port 420, and the second gas port 120, and flushes The first molecular sieve cartridge 100 is washed, and the nitrogen on the molecular oxygen generating sieve 500 of the first molecular sieve cartridge 100 is desorbed (i.e., nitrogen desorbs the molecular oxygen generating sieve 500). The mixed gas of the desorbed nitrogen and oxygen enters the first gas manifold plate 300 through the first gas port 110 and is then discharged into the atmosphere through the exhaust port. At the same time, in order to pressurize the oxygen in the second gas manifold plate 400, the valve cores of the two fifth valves 650 are moved toward the second gas port 120 and the fourth gas port 220 to compress the oxygen in the second gas manifold plate 400, so as to fully flush the first molecular sieve cartridge 100 and empty the oxygen in the second gas manifold plate 400, thereby achieving the flushing of the first molecular sieve cartridge 100 and the oxygen production of the second molecular sieve cartridge 200. The above steps are repeated continuously to continuously extract oxygen to the oxygen storage 700 and flush the molecular sieve cartridges. Finally, the oxygen outlet solenoid valve 710 at the gas outlet of the oxygen storage 700 is controlled to open to discharge oxygen for use by the user.

[0050] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0051] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A molecular sieve cartridge assembly, characterized in that: include: a first molecular sieve cartridge having a first gas port and a second gas port; a second molecular sieve cartridge having a third gas port and a fourth gas port; a first gas manifold plate, connected to the first gas port and the third gas port, the first gas manifold plate being provided with a gas source port and an exhaust port, the gas source port being used to connect to an air source, the exhaust port being used to connect to the atmosphere, one of the first gas port and the third gas port being connected to the gas source port, and the other being connected to the exhaust port; a second gas circuit board, connected to the second gas port and the fourth gas port, the second gas circuit board is provided with an oxygen exhaust port, and the second gas port, the fourth gas port and the oxygen exhaust port are connected to each other; the first gas circuit board is provided with a first valve, a second valve, a third valve and a fourth valve, the first valve is used to control the connection and disconnection between the first gas port and the gas source port, the second valve is used to control the connection and disconnection between the first gas port and the exhaust port, the third valve is used to control the connection and disconnection between the third gas port and the gas source port, and the fourth valve is used to control the connection and disconnection between the third gas port and the exhaust port; The oxygen exhaust port is provided with a one-way valve; The second air manifold is provided with a fifth valve, the valve core of the fifth valve being located in the air passage of the second air manifold. The valve core can move in a direction close to or away from the second air port or the fourth air port. The valve core of the fifth valve is equivalent to the piston of the cylinder, and the valve body of the fifth valve is equivalent to the cylinder body of the cylinder. The valve core of the fifth valve can change the volume of the air passage where the valve core of the fifth valve is located, thereby changing the air pressure of the air passage where the valve core of the fifth valve is located. It can not only compress the oxygen in the second air manifold, increase the pressure of the oxygen, and enhance the flushing effect, but also discharge all the oxygen in the second air manifold, thereby improving the oxygen production effect. Two fifth valves are provided, one of which is located on the side of the second air port, and the other is located on the side of the fourth air port. The first gas circuit board is provided with a pressure detection port; The second gas circuit plate comprises a first plate and a second plate, the first plate and the second plate are detachably fixedly connected, a sealing gasket is provided between the first plate and the second plate, the second gas port and the fourth gas port are communicated through the second plate, the second gas port and the oxygen exhaust port are communicated through the first plate, and the fourth gas port and the oxygen exhaust port are communicated through the first plate; The first air circuit plate is provided with a fifth air port, a sixth air port, a seventh air port and an eighth air port, the fifth air port and the sixth air port are both communicated with the first air port, the fifth air port is communicated with the air source port, the sixth air port is communicated with the exhaust port, the seventh air port and the eighth air port are both communicated with the third air port, the seventh air port is communicated with the air source port, and the eighth air port is communicated with the exhaust port; the second air circuit plate is provided with a ninth air port, a tenth air port, an eleventh air port and a twelfth air port which are communicated with each other, the ninth air port and the tenth air port are both communicated with the second air port, the eleventh air port and the twelfth air port are both communicated with the fourth air port, two oxygen exhaust ports are provided, and the two oxygen exhaust ports are located between the ninth air port and the eleventh air port.

2. The molecular sieve cartridge assembly according to claim 1, characterized in that: The first valve, the second valve, the third valve, the fourth valve and the fifth valve are all solenoid valves.

3. The molecular sieve cartridge assembly according to claim 2, characterized in that: An oxygen storage is also included. The oxygen storage is located between the first molecular sieve cartridge and the second molecular sieve cartridge. The air inlet of the oxygen storage is communicated with the oxygen outlet.

4. An oxygen concentrator, characterized in that: The molecular sieve cartridge assembly comprises the molecular sieve cartridge assembly according to any one of claims 1 to 3.

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