A micro-sleeve type multi-tower pressure swing adsorption oxygen production system with a rotary valve

Abstract

The present application relates to air separation oxygen technology field, especially to a kind of micro sleeve type multi-tower pressure swing adsorption oxygen production system with rotary valve, including combination adsorption tower and rotary valve, each combination adsorption tower includes internal adsorption tower and external adsorption tower, and combination adsorption tower is equipped with adsorption tower cover, rotary valve includes valve body with valve cavity, static valve piece and dynamic valve piece are arranged in valve cavity, first through hole, second through hole and desorption through hole are formed in static valve piece, first air inlet groove, second air inlet groove, communication groove, first desorption groove and second desorption groove are formed in dynamic valve piece;The present application uses the external adsorption tower and internal adsorption tower of sleeve structure to carry out adsorption process and desorption process respectively, adsorption process releases heat, desorption process will absorb heat, two processes can heat exchange each other to strengthen adsorption performance and desorption performance, and the gas desorbed enters adsorption tower cover, can reduce noise when desorbing, and desorption gas flow also can carry out heat exchange with external adsorption tower.

Description

Technical Field

[0001] This invention relates to the field of air separation oxygen generation technology, and in particular to a miniature sleeve-type multi-tower pressure swing adsorption oxygen generation system with a rotary valve. Background Technology

[0002] A multi-tower oxygen generator system is a device used to extract pure oxygen from the air. Its principle is based on molecular sieve technology, primarily using molecules of different sizes and polarities to separate nitrogen, oxygen, and other gases from the air, resulting in a higher concentration of oxygen produced. The multi-tower oxygen generator system mainly utilizes PSA (Pressure Swing Adsorption) technology. Its working principle is based on ambient air as raw material. Under normal temperature and low pressure conditions, it leverages the characteristic of molecular sieves that increase the adsorption capacity of nitrogen in the air when pressurized and decrease the adsorption capacity when depressurized, forming a rapid cycle of pressurized adsorption and depressurized desorption. This allows oxygen and nitrogen in the air to be separated. Carbon dioxide, gaseous acids, and other gaseous oxides in the air are all highly polar substances and have difficulty passing through the molecular sieve, thus increasing the purity of the produced oxygen. This type of oxygen generator system is commonly used in medical and industrial fields to provide a high-quality oxygen source. Adsorption towers release heat during adsorption and absorb heat during desorption; however, in current technologies, the adsorption towers are all independently set up, and the heat from the two processes cannot be utilized interchangeably, resulting in low oxygen production efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: in order to overcome the problems of low heat exchange utilization and low oxygen production efficiency in the existing multi-tower oxygen production system, a miniature sleeve-type multi-tower pressure swing adsorption oxygen production system with a rotary valve is provided.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a miniature sleeve-type multi-tower pressure swing adsorption oxygen generation system with a rotary valve includes a combined adsorption tower and a rotary valve for switching the gas inlet circuit and desorption circuit of the combined adsorption tower.

[0005] Each combined adsorption tower is a sleeve structure, which includes an inner adsorption tower and an outer adsorption tower surrounding the inner adsorption tower. The combined adsorption tower is covered with an adsorption tower cover, and a desorption chamber is formed between the inner peripheral wall of the adsorption tower cover and the outer peripheral wall of the outer adsorption tower for the desorption gas flow to enter.

[0006] The rotary valve includes a valve body with a valve cavity, the valve body having an air inlet communicating with the valve cavity, and the valve cavity having a stationary valve plate and a movable valve plate that is opposite to and rotatable.

[0007] The static valve plate has a first through hole communicating with the external adsorption tower, a second through hole communicating with the internal adsorption tower, and a desorption through hole communicating with the desorption chamber.

[0008] The moving valve plate has a first air inlet groove for connecting the air inlet and the first through hole, a second air inlet groove for connecting the air inlet and the second through hole, a connecting groove for connecting the desorption through hole, a first desorption groove for connecting the first through hole and the connecting groove, and a second desorption groove for connecting the second through hole and the connecting groove. The first air inlet groove and the first desorption groove are spaced apart along the circumference of the moving valve plate, and the second air inlet groove and the second desorption groove are also spaced apart along the circumference of the moving valve plate, and the first air inlet groove and the second air inlet groove are staggered.

[0009] Furthermore, the combined adsorption towers consist of four towers, arranged in a symmetrical pairwise structure.

[0010] Furthermore, there are two of each of the first air intake groove and the first desorption groove, which are arc-shaped and together form an outer ring group. There are two of each of the second air intake groove and the second desorption groove, which are arc-shaped and together form an inner ring group. The connecting groove is an annular structure. The connecting groove, the outer ring group and the inner ring group are distributed sequentially from the outside to the inside.

[0011] The desorption through-hole, the first through-hole, and the second through-hole are distributed sequentially from the outside to the inside.

[0012] Furthermore, an air inlet end cap is provided between the valve body and the combined adsorption tower, on which, from the outside to the inside, are sequentially provided a first air inlet hole for connecting the first through hole to the external adsorption tower, a second air inlet hole for connecting the second through hole to the internal adsorption tower, and a desorption hole for connecting the desorption through hole to the desorption chamber.

[0013] Furthermore, the cross-sectional area of ​​the internal adsorption tower is equal to that of the external adsorption tower.

[0014] Furthermore, the top of the combined adsorption tower is equipped with an outlet end cap, which has an external air vent communicating with the external adsorption tower, an internal air vent communicating with the internal adsorption tower, and an oxygen storage hole located in the center. The oxygen storage hole communicates with the external air vent and the internal air vent. An oxygen storage tank is installed at the bottom of the oxygen storage hole. The top of the outlet end cap is covered with an oxygen storage cover plate for sealing the external air vent and the internal air vent. An air outlet communicating with the oxygen storage hole is opened in the center of the oxygen storage cover plate.

[0015] Furthermore, the depths of the second air inlet groove and the first air inlet groove are less than the depths of the second desorption groove and the first desorption groove.

[0016] Furthermore, the wall material of the internal adsorption tower is copper.

[0017] Furthermore, each of the first and second air intake slots has several spaced air intake holes inside.

[0018] Furthermore, the air inlet end cover is provided with a lower mounting groove for installing the adsorption tower cover, the external adsorption tower and the internal adsorption tower, and the air outlet end cover is provided with an upper mounting groove for installing the adsorption tower cover, the external adsorption tower and the internal adsorption tower.

[0019] The beneficial effects of this invention are as follows: This invention utilizes an external adsorption tower and an internal adsorption tower with a sleeve structure to carry out the adsorption and desorption processes respectively. The adsorption process is exothermic, while the desorption process is endothermic. The two processes can exchange heat with each other to enhance the adsorption and desorption performance. Furthermore, an adsorption tower cover is set on the outside of the external adsorption tower, and the desorbed gas enters the adsorption tower cover through the desorption hole on the inlet end cover, reducing noise during desorption. The airflow generated by desorption also exchanges heat with the external adsorption tower, which is beneficial to the adsorption or desorption of the external adsorption tower. This increases the efficiency of adsorption and desorption, promotes the oxygen production efficiency, and significantly improves the overall system performance. In addition, the sleeve-shaped design reduces the volume of the oxygen production system and increases the system integration. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is the front view of the present invention;

[0023] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0024] Figure 4 This is a schematic diagram of the structure of the adsorption tower after the adsorption tower cover has been removed;

[0025] Figure 5 This is a top view of the moving valve plate;

[0026] Figure 6 A three-dimensional schematic diagram of the moving valve plate;

[0027] Figure 7 This is a top view of the stationary valve plate;

[0028] Figure 8 This is a three-dimensional schematic diagram of the static valve plate;

[0029] Figure 9 This is a three-dimensional schematic diagram of the air intake end cap;

[0030] Figure 10 This is a schematic diagram of the assembly of the outlet cap and the oxygen storage tank.

[0031] Figure 11 This is a top view of the vent end cap;

[0032] In the picture:

[0033] 1. Motor; 2. Valve body; 3. Valve chamber; 4. Air inlet; 5. Stationary valve plate; 6. Moving valve plate; 7. First air inlet groove; 8. First desorption groove; 9. Second air inlet groove; 10. Second desorption groove; 11. Connecting groove; 12. Connecting hole; 13. Air inlet through hole; 14. First through hole; 15. Second through hole; 16. Desorption through hole; 17. Desorption hole; 18. Air inlet end cap; 19. First air inlet. 20. Second air inlet; 21. Adsorption tower cover; 22. External adsorption tower; 23. Internal adsorption tower; 24. Air outlet cover; 25. External air vent; 26. Oxygen storage hole; 27. Oxygen storage tank; 28. Oxygen storage cover plate; 29. ​​Air outlet; 30. Diverter plate; 31. Internal air outlet; 32. Desorption chamber; 33. Desorption port; 34. Upper mounting groove; 35. Lower mounting groove; 36. Long groove. Detailed Implementation

[0034] The invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention in a schematic manner. Therefore, they only show the components relevant to the invention, and directions and references, such as up, down, left, right, etc., are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0035] Example 1:

[0036] Figures 1-4 As shown, the present invention is a miniature sleeve-type multi-tower pressure swing adsorption oxygen generation system with a rotary valve, including a combined adsorption tower and a rotary valve for switching the gas inlet circuit and desorption circuit of the combined adsorption tower.

[0037] Each combined adsorption tower is a sleeve-type structure, including an inner adsorption tower 23 and an outer adsorption tower 22 surrounding the inner adsorption tower 23. Both the outer adsorption tower 22 and the inner adsorption tower 23 are filled with molecular sieves, which are pressed together by several flow dividers 30. The combined adsorption tower is covered by an adsorption tower cover 21. A desorption chamber 32 is formed between the inner peripheral wall of the adsorption tower cover 21 and the outer peripheral wall of the outer adsorption tower 22 for the desorption gas flow to enter. Both the inner adsorption tower 23 and the outer adsorption tower 22 are cylindrical structures, while the adsorption tower cover 21 is a square structure.

[0038] The rotary valve includes a valve body 2 with a valve cavity 3. The valve body 2 is provided with an air inlet 4 communicating with the valve cavity 3. The valve cavity 3 is provided with a stationary valve plate 5 and a movable valve plate 6 that is opposite to and rotatable. The rotary valve is driven by a motor 1. The movable valve plate 6 is connected to the output end of the motor 1. An elastic element is provided on the side of the movable valve plate 6 away from the stationary valve plate 5 to keep it in contact with the stationary valve plate 5. The elastic element is a compression spring, one end of which abuts against the movable valve plate 6 and the other end abuts against the cavity wall of the valve cavity 3.

[0039] The static valve plate 5 has a first through hole 14 communicating with the external adsorption tower 22, a second through hole 15 communicating with the internal adsorption tower 23, and a desorption through hole 16 communicating with the desorption chamber 32. Figure 7 and Figure 8 As shown;

[0040] The movable valve plate 6 has a first air inlet groove 7 for connecting the air inlet 4 and the first through hole 14, a second air inlet groove 9 for connecting the air inlet 4 and the second through hole 15, a connecting groove 11 for connecting the desorption through hole 16, a first desorption groove 8 for connecting the first through hole 14 and the connecting groove 11, and a second desorption groove 10 for connecting the second through hole 15 and the connecting groove 11. The first air inlet groove 7 and the first desorption groove 8 are spaced apart along the circumference of the movable valve plate 6, and the second air inlet groove 9 and the second desorption groove 10 are also spaced apart along the circumference of the movable valve plate 6. The first air inlet groove 7 and the second air inlet groove 9 are staggered. A connecting hole 12 is provided between the first desorption groove 8 and the second desorption groove 10 and the connecting groove 11. The connecting hole 12 between the second desorption groove 10 and the connecting groove 11 passes through the first air inlet groove 7 and is not connected to the first air inlet groove 7. Figure 5 and Figure 6 As shown.

[0041] When the air inlet 4, the first air inlet groove 7 and the first through hole 14 are connected in sequence, the external adsorption tower 22 is in the adsorption state.

[0042] When the first through hole 14, the first desorption groove 8, the connecting groove 11, the desorption through hole 16 and the desorption chamber 32 are connected in sequence, the external adsorption tower 22 is in the desorption state.

[0043] When the air inlet 4, the second air inlet groove 9 and the second through hole 15 are connected in sequence, the internal adsorption tower 23 is in the adsorption state.

[0044] When the second through hole 15, the second desorption groove 10, the connecting groove 11, the desorption through hole 16 and the desorption chamber 32 are connected in sequence, the internal adsorption tower 23 is in the desorption state.

[0045] Air enters through inlet 4 and, through the rotation of valve plate 6, flows into the internal adsorption tower 23 and the external adsorption tower 22. The internal adsorption tower 23 operates in one cycle, while the external adsorption tower 22 operates in another. When the external adsorption tower 22 adsorbs, the internal adsorption tower 23 desorbs; when the external adsorption tower 22 desorbs, the internal adsorption tower 23 adsorbs. The internal adsorption tower 23 releases heat during adsorption, while the external adsorption tower absorbs heat during desorption. This mutual heat exchange enhances the adsorption and desorption performance, resulting in a lower temperature than traditional adsorption processes and a higher temperature than traditional desorption processes. Furthermore, the desorbed gas enters the adsorption tower hood 21 through the desorption through-hole 16, reducing noise during oxygen production. The airflow generated during desorption also exchanges heat with the external adsorption tower 22, which is beneficial for the adsorption or desorption of the external adsorption tower 22. Simultaneously, the switching of the above gas paths is achieved through a rotary valve, resulting in high system integration, good oxygen production performance, and a sleeve-shaped design that reduces the size of the oxygen production system and improves system integration.

[0046] In some examples, there are four combined adsorption towers, arranged in a symmetrical pairwise structure to form an eight-tower structure. When two of the symmetrical external adsorption towers 22 are adsorbing, the two corresponding internal adsorption towers 23 are desorbing, and at the same time, the other two external adsorption towers 22 are desorbing, while the two corresponding internal adsorption towers 23 are adsorbing.

[0047] In some examples, there are two of the first air intake groove 7 and the first desorption groove 8, which are arc-shaped and form an outer ring group. There are two of the second air intake groove 9 and the second desorption groove 10, which are arc-shaped and form an inner ring group. The arc-shaped structure facilitates air circulation and reduces high-pressure impact. The connecting groove 11 is a ring structure. The connecting groove 11, the outer ring group and the inner ring group are distributed from the outside to the inside.

[0048] The desorption through-hole 16, the first through-hole 14 and the second through-hole 15 are distributed from the outside to the inside, and there are four of each. The desorption through-hole 16 corresponds to the connecting groove 11, the first through-hole 14 corresponds to the outer ring group, and the second through-hole 15 corresponds to the inner ring group.

[0049] In some examples, such as Figure 9 As shown, an air inlet cap 18 is provided between the valve body 2 and the combined adsorption tower. From the outside to the inside, the cap 18 is provided with a first air inlet 19 for connecting the first through hole 14 to the external adsorption tower 22, a second air inlet 20 for connecting the second through hole 15 to the internal adsorption tower 23, and a desorption hole 17 for connecting the desorption through hole 16 to the desorption chamber 32. There are four first air inlets 19 and four desorption holes 17.

[0050] In some examples, the cross-sectional area of ​​the inner adsorption tower 23 is equal to that of the outer adsorption tower 22, so that they achieve equal volume and thus sufficient heat exchange.

[0051] In some examples, such as Figure 10 and Figure 11 As shown, the combined adsorption tower is equipped with an outlet end cap 24 on top. The outlet end cap 24 has an external air passage 25 communicating with the external adsorption tower 22, an internal air passage 31 communicating with the internal adsorption tower 23, a desorption port 33 communicating with the desorption chamber 32 for the desorption gas flow to be discharged, and an oxygen storage hole 26 located in the center. The oxygen storage hole 26 is connected to the external air passage 25 and the internal air passage 31 through a long groove 36. An oxygen storage tank 27 is installed at the bottom of the oxygen storage hole 26. The top of the outlet end cap 24 is covered with an oxygen storage cover plate 28 for sealing the external air passage 25 and the internal air passage 31. An air outlet 29 communicating with the oxygen storage hole 26 is opened in the center of the oxygen storage cover plate 28.

[0052] In some examples, the depths of the second air intake groove 9 and the first air intake groove 7 are less than the depths of the second desorption groove 10 and the first desorption groove 8, so that the two first desorption grooves 8 are interconnected and connected to the connecting groove 11, and the two second desorption grooves 10 are interconnected and connected to the connecting groove 11.

[0053] In some examples, the inner adsorption tower 23 has a copper wall material with a wall thickness of 0.5mm ± 0.2mm. The copper tube has a high thermal conductivity, which facilitates sufficient heat exchange between the inner and outer adsorption towers.

[0054] In some examples, each of the first air intake slots 7 and the second air intake slots 9 has a number of spaced air intake holes 13. The number of air intake holes 13 can be two, three or four, etc. In this embodiment, the number of air intake holes 13 in each of the first air intake slots 7 and the second air intake slots 9 is four.

[0055] In some examples, the air inlet end cap 18 is provided with a lower mounting groove 35 for installing the adsorption tower cover 21, the external adsorption tower 22 and the internal adsorption tower 23, and the air outlet end cap 24 is provided with an upper mounting groove 34 for installing the adsorption tower cover 21, the external adsorption tower 22 and the internal adsorption tower 23, with the adsorption tower cover 21, the external adsorption tower 22 and the internal adsorption tower 23 being engaged between the upper mounting groove 34 and the lower mounting groove 35.

[0056] Working principle:

[0057] Air enters valve chamber 3 through inlet 4. Motor 1 drives valve plate 6 to rotate, switching between the intake and desorption circuits. The internal adsorption tower 23 performs one cycle, and the external adsorption tower 22 performs another. Taking one of the combined adsorption towers as an example, air enters the first intake slot 7 through inlet hole 13, passes through the first through hole 14 on the static valve plate 5 and the first intake hole 19 on the intake end cover 18, and is sent to the external adsorption tower 22 for adsorption. The oxygen obtained after adsorption is sent to the oxygen storage tank 27 through the outlet air vent 25 on the outlet end cover 24. The final oxygen can be sent out through outlet 29. At the same time, the internal adsorption tower 23 performs desorption, and the adsorption is divided into... The gas enters the desorption chamber 32 sequentially through the second air inlet 20, the second through hole 15, the second desorption groove 10, the connecting groove 11, the desorption through hole 16, and the desorption hole 17, and is discharged through the desorption port 33. During this process, when the external adsorption tower 22 adsorbs, the internal adsorption tower 23 desorbs. Adsorption releases heat, and desorption absorbs heat, thus exchanging heat with each other to enhance the adsorption and desorption performance. The temperature is lower than that of the traditional adsorption process and higher than that of the traditional desorption process. Furthermore, the desorbed gas enters the adsorption tower cover 21 through the desorption through hole 16, reducing the noise during the oxygen production process. The airflow generated by desorption also exchanges heat with the external adsorption tower 22, which is beneficial to the adsorption or desorption of the external adsorption tower 22.

[0058] The above description, based on the preferred embodiments of the present invention, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A miniature sleeve-type multi-tower pressure swing adsorption oxygen generation system with a rotary valve, characterized in that: Includes a combined adsorption tower and a rotary valve for switching the inlet circuit and desorption circuit of the combined adsorption tower; Each combined adsorption tower is a sleeve structure, which includes an inner adsorption tower (23) and an outer adsorption tower (22) surrounding the inner adsorption tower (23). The combined adsorption tower is covered with an adsorption tower cover (21). A desorption chamber (32) is formed between the inner peripheral wall of the adsorption tower cover (21) and the outer peripheral wall of the outer adsorption tower (22) for the desorption gas flow to enter. The rotary valve includes a valve body (2) having a valve cavity (3), the valve body (2) having an air inlet (4) communicating with the valve cavity (3), and the valve cavity (3) having a stationary valve plate (5) and a movable valve plate (6) that is opposite to and rotatable. The static valve plate (5) is provided with a first through hole (14) communicating with the external adsorption tower (22), a second through hole (15) communicating with the internal adsorption tower (23), and a desorption through hole (16) communicating with the desorption chamber (32). The moving valve plate (6) is provided with a first air inlet groove (7) for connecting the air inlet (4) and the first through hole (14), a second air inlet groove (9) for connecting the air inlet (4) and the second through hole (15), a connecting groove (11) for connecting the desorption through hole (16), a first desorption groove (8) for connecting the first through hole (14) and the connecting groove (11), and a second desorption groove (10) for connecting the second through hole (15) and the connecting groove (11). The first air inlet groove (7) and the first desorption groove (8) are spaced apart along the circumference of the moving valve plate (6), and the second air inlet groove (9) and the second desorption groove (10) are also spaced apart along the circumference of the moving valve plate (6). The first air inlet groove (7) and the second air inlet groove (9) are staggered.

2. The miniature sleeve-type multi-tower pressure swing adsorption oxygen generation system with a rotary valve according to claim 1, characterized in that: The combined adsorption towers consist of four towers, arranged in a symmetrical pairwise structure.

3. A miniature sleeve-type multi-tower pressure swing adsorption oxygen generation system with a rotary valve according to claim 2, characterized in that: There are two of the first air inlet groove (7) and the first desorption groove (8) in an arc shape, which together form a first ring group. There are two of the second air inlet groove (9) and the second desorption groove (10) in an arc shape, which together form a second ring group. The connecting groove (11) is a ring structure. The connecting groove (11), the second ring group and the first ring group are distributed from the outside to the inside. The desorption through-hole (16), the second through-hole (15) and the first through-hole (14) are distributed from the outside to the inside.

4. A miniature sleeve-type multi-tower pressure swing adsorption oxygen generation system with a rotary valve according to claim 2, characterized in that: The valve body (2) is provided with an air inlet end cap (18) between it and the combined adsorption tower. From the outside to the inside, the valve body (2) is provided with a first air inlet (19) for connecting the first through hole (14) and the external adsorption tower (22), a second air inlet (20) for connecting the second through hole (15) and the internal adsorption tower (23), and a desorption hole (17) for connecting the desorption through hole (16) and the desorption chamber (32).

5. A miniature sleeve-type multi-tower pressure swing adsorption oxygen generation system with a rotary valve according to claim 1, characterized in that: The cross-sectional area of ​​the internal adsorption tower (23) is equal to that of the external adsorption tower (22).

6. A miniature sleeve-type multi-tower pressure swing adsorption oxygen generation system with a rotary valve according to claim 4, characterized in that: The combined adsorption tower is equipped with an outlet end cap (24) at the top. The outlet end cap (24) is provided with an external air passage (25) communicating with the external adsorption tower (22), an internal air passage (31) communicating with the internal adsorption tower (23), and an oxygen storage hole (26) located in the center. The oxygen storage hole (26) is connected to the external air passage (25) and the internal air passage (31). An oxygen storage tank (27) is installed at the bottom of the oxygen storage hole (26). The top of the outlet end cap (24) is covered with an oxygen storage cover plate (28) for sealing the external air passage (25) and the internal air passage (31). An outlet (29) communicating with the oxygen storage hole (26) is opened in the center of the oxygen storage cover plate (28).

7. A miniature sleeve-type multi-tower pressure swing adsorption oxygen generation system with a rotary valve according to claim 3, characterized in that: The depths of the second air inlet groove (9) and the first air inlet groove (7) are less than the depths of the second desorption groove (10) and the first desorption groove (8).

8. A miniature sleeve-type multi-tower pressure swing adsorption oxygen generation system with a rotary valve according to claim 1, characterized in that: The wall material of the internal adsorption tower (23) is copper.

9. A miniature sleeve-type multi-tower pressure swing adsorption oxygen generation system with a rotary valve according to claim 1, characterized in that: Each of the first air intake slot (7) and the second air intake slot (9) has several spaced air intake holes (13).

10. A miniature sleeve-type multi-tower pressure swing adsorption oxygen generation system with a rotary valve according to claim 6, characterized in that: The inlet end cap (18) is provided with a lower mounting groove (35) for installing the adsorption tower cover (21), the external adsorption tower (22) and the internal adsorption tower (23), and the outlet end cap (24) is provided with an upper mounting groove (34) for installing the adsorption tower cover (21), the external adsorption tower (22) and the internal adsorption tower (23).

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