CN210786749U - Upper cover of molecular sieve tower - Google Patents

Abstract

The utility model discloses an upper cover of a molecular sieve tower, which solves the technical problems of complicated gas circuit connection and inconvenient maintenance and disassembly of the existing oxygenerator by improving the air passage connection mode of the existing oxygenerator; the inner cavity of the upper cover body is divided into: the first cover cavity, the second cover cavity, the third cover cavity, the first air passage, the second air passage and the third air passage; the first cover cavity is communicated with the first air passage; the second cover cavity is communicated with a second air channel; the third cover cavity is communicated with a third air passage; the first air passage and the third air passage are respectively communicated with the second air passage through one-way valves; the utility model discloses a molecular sieve tower upper cover can reduce and set up numerous and diverse connecting tube, reduces the volume of oxygenerator molecular sieve, improves the structural strength of molecular sieve tower and the gas tightness of molecular sieve tower.

Description

Upper cover of molecular sieve tower

Technical Field

The utility model relates to an oxygen making equipment makes technical field, especially relates to a molecular sieve tower upper cover.

Background

The molecular sieve tower is the core of oxygenerator, if realize its complete function, need connect the air inlet source with the source of giving vent to anger with it, the inside complicated pipeline that also has of molecular sieve tower, if complete connection, the pipeline of molecular sieve is very complicated, conventional design uses traditional threaded connection, establish ties through hose or stainless steel pipe and realize its function, but the shortcoming is that the installation is not convenient, complex operation, the pipeline is crisscross, lead to the volume very big, and the pipeline is fragile, the gas tightness and the quality of machine all can't be guaranteed. Specifically, in order to meet the need of backwashing, six hoses are usually required to be arranged above an upper cover of a molecular sieve tower in the prior art to establish connection of backwashing pipelines; correspondingly, six corresponding pipeline joints are also required to be arranged on the upper cover; the complex pipeline connection often becomes an unavoidable core problem in the overhauling operation of the oxygen generator; in addition, because the gas flows in the oxygen generator pipeline and usually does not carry impurities capable of blocking the pipeline, the pipeline applied to the oxygen generator does not usually involve pipeline dredging operation, but when the inside of the molecular sieve tower is overhauled and maintained, the upper cover is disassembled one of inevitable steps, so that the service life of the connecting hose can be shortened due to frequent disassembly of the pipeline joint caused by the disassembly, and the service life of the joint can also be adversely affected. Under the structure, poor sealing of the joint can become a key factor for limiting the service life of the connecting hose, the labor intensity of daily maintenance of the molecular sieve tower is increased to a certain extent, and the use cost of the molecular sieve tower is further increased.

Therefore, it is an urgent need for those skilled in the art to provide an upper cover of a molecular sieve tower to solve at least one of the above technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a molecular sieve tower upper cover solves current oxygenerator gas circuit through improving current oxygenerator air flue connected mode and connects too complicacy, the technical problem of inconvenient maintenance dismantlement.

In order to achieve the above object:

on the one hand, the utility model provides a molecular sieve tower upper cover, the inner chamber of upper cover body is separated for: the first cover cavity, the second cover cavity, the third cover cavity, the first air passage, the second air passage and the third air passage; the first cover cavity is communicated with the first air passage; the second cover cavity is communicated with a second air channel; the third cover cavity is communicated with a third air passage; the first air passage and the third air passage are respectively communicated with the second air passage through one-way valves.

Preferably, the device further comprises a solenoid valve; a back flushing air passage which is independently communicated is arranged between the first air passage and the third air passage; the electromagnetic valve is arranged in the second air passage and used for controlling the back flushing air passage to be opened and closed.

Preferably, the first air passage and the third air passage are respectively communicated with the second air passage through an umbrella-shaped reverse flow valve.

Preferably, the side of upper cover body is provided with the air flue link, the air flue link is provided with: a left air outlet, a right air outlet and an air collecting port; the left air outlet is an external interface of the first air passage; the right air outlet is an external interface of the third air passage; the air collecting port is an external interface of the second cover cavity; the connection structural component between the electromagnetic valve and the second air channel comprises: the air passage gasket sealing ring, the upper cover gasket, the umbrella-shaped reverse flow valve and the air passage side sealing ring are arranged on the air passage side sealing cover; an upper cover side seal is buckled on the electromagnetic valve outer cover; a left air outlet cavity and a right air outlet cavity are arranged on one side of the upper cover gasket and are connected with the air passage connecting end in a sealing mode through the air passage gasket sealing ring; the left air outlet is only communicated with the left air outlet cavity, and the right air outlet is only communicated with the right air outlet cavity; the left air outlet cavity and the right air outlet cavity are respectively communicated with the other side of the upper cover gasket in a one-way mode through the umbrella-shaped reverse flow valve; the left air outlet cavity and the right air outlet cavity are connected through a back flushing air passage which is independently communicated, and the electromagnetic valve is used for controlling the opening and closing of the back flushing air passage; the upper cover gasket is provided with an air inlet through hole at the position close to the air collecting port; the upper cover side seal fixedly connects the air passage gasket sealing ring, the upper cover gasket, the umbrella-shaped reverse flow valve, the air passage side seal sealing ring and the electromagnetic valve to the air passage connecting end in an extrusion sealing mode.

Preferably, the end surface shapes of the first cover cavity and the third cover cavity are respectively matched with the upper end surface shape of the molecular sieve cavity; the end surface of the second cover cavity is matched with the upper end surface of the gas collection cavity in shape.

Preferably, the shape of the upper cover body is matched with the shape of the upper end face of the molecular sieve shell or the bracket.

Preferably, the upper cover body is provided with a bolt connecting hole.

Preferably, the inner cavity of the upper cover body is provided with a rib plate.

Preferably, the lower end surfaces of the first cover cavity, the second cover cavity and the third cover cavity are respectively provided with a sealing ring.

The utility model discloses a molecular sieve tower upper cover can reduce and set up numerous and diverse connecting tube, reduces the volume of oxygenerator molecular sieve, improves the structural strength of molecular sieve tower and the gas tightness of molecular sieve tower. Particularly, the hose for connection is omitted, and the structural design space of related equipment is remarkably saved; the improved molecular sieve tower upper cover can reduce the damage probability of the pipeline, prolong the service life of related equipment and bring great convenience for future after-sale maintenance; further, the utility model provides a pipeline connection mode that the molecular sieve upper cover adopted compares and has high gas tightness before improving, can reduce gaseous kinetic energy loss, improves the production efficiency of oxygen. Furthermore, the utility model provides a make the molecular sieve tower obtain further optimization on the assembly and disassembly mode after the molecular sieve tower upper cover adopts above-mentioned structure, can save the equipment time of product by a wide margin, improve the production efficiency of stick product.

Drawings

FIG. 1 is a schematic structural diagram of an upper cover of a molecular sieve column in an embodiment of the present application;

FIG. 2 is an exploded view of the structure of the upper cover of the molecular sieve column in the embodiment of the present application;

FIG. 3 is a perspective view of the structure of FIG. 2 showing the manner in which the air holes of the upper gasket are provided;

FIG. 4 is a schematic view of the arrangement of the air holes of the upper gasket in FIG. 2;

FIG. 5 is a schematic structural diagram of a molecular sieve column employing an upper cover of the molecular sieve column of the present application;

FIG. 6 is a schematic diagram of the left side air intake mode of the molecular sieve column in the embodiment of the present application;

FIG. 7 is a schematic diagram of a left side air intake backwash mode in the embodiment of the present application;

FIG. 8 is a schematic diagram of the air inlet mode of the right side of the molecular sieve column in the embodiment of the present application;

FIG. 9 is a schematic diagram of a right side intake backwash method in the embodiment of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an upper cover of a molecular sieve column provided in this embodiment. In a specific embodiment, the utility model provides a molecular sieve tower upper cover, the inner chamber of upper cover body is separated: a first cap cavity 100, a second cap cavity 200, a third cap cavity 300, a first air passage 400, a second air passage 500, and a third air passage 600; the first cover chamber 100 communicates with a first air passage 400; the second cap cavity 200 communicates with the second air duct 500; the third cover chamber 300 is in communication 600 with a third air passage; the first air passage 400 and the third air passage 600 are respectively communicated with the second air passage 500 through one-way valves.

Specifically, as shown in fig. 1, a side cover is disposed on a side surface of the upper cover of the molecular sieve column, and a sealed cavity 700 is enclosed by the side cover and the side wall of the upper cover of the molecular sieve column, and the check valve is disposed at the outlet of the first air duct 400 and the outlet of the second air duct 500, and is communicated with the second air duct 500 by means of the cavity 700.

Further, in one of the preferable technical solutions of this embodiment, the apparatus further includes an electromagnetic valve; a back flushing air passage which is independently communicated is arranged between the first air passage and the third air passage; the electromagnetic valve is arranged in the second air passage and used for controlling the back flushing air passage to be opened and closed. Preferably, in one preferred technical solution of the present embodiment, the solenoid valve and the backwash air duct may be disposed in the cavity 700.

It should be noted that the structure of the solenoid valve 700 is prior art, and therefore, the details of the structure are not further illustrated and described herein.

Further, in one preferable technical solution of this embodiment, the first air passage and the third air passage are respectively communicated with the second air passage through an umbrella-shaped backflow valve.

Further, in one preferred technical solution of this embodiment, the end surface profiles of the first cover cavity and the third cover cavity are respectively adapted to the upper end surface profile of the molecular sieve cavity; the end surface of the second cover cavity is matched with the upper end surface of the gas collection cavity in shape.

Further, in one preferable technical solution of this embodiment, the shape of the upper cover body is matched with the shape of the upper end surface of the molecular sieve casing or the support.

Further, in one preferable technical solution of this embodiment, the upper cover body is provided with a bolt connection hole.

Further, in one preferable technical solution of this embodiment, an inner cavity of the upper cover body is provided with a rib plate.

Further, in one of the preferable technical solutions of this embodiment, the lower end surfaces of the first cover cavity, the second cover cavity and the third cover cavity are respectively provided with a sealing ring.

Specifically, the structural explosion diagram of the upper cover of the molecular sieve tower is shown in fig. 2, an air passage connecting end L is arranged on the side surface of the upper cover body B, and the air passage connecting end L is provided with: left outlet port 110, right outlet port 310, and air collection port 210; the left air outlet 110 is an external interface of the first air duct 400; the right air outlet 310 is an external interface of the third air passage 600; the air collecting port 210 is an external interface of the second cover cavity 200; the connection structural components between the electromagnetic valve 705 and the second air passage 500 include: an air channel gasket sealing ring 701, an upper cover gasket 702, an umbrella-shaped reverse flow valve 703 and an air channel side sealing ring 704; an upper cover side seal 706 is buckled on the outer cover of the electromagnetic valve 705;

as shown in fig. 2 to 4, a left air outlet cavity P and a right air outlet cavity Q are arranged on one side of the upper cover gasket 702, and are connected with the air passage connecting end L in a sealing manner through the air passage gasket sealing ring 701; the left air outlet 110 is only communicated with the left air outlet cavity P, and the right air outlet 310 is only communicated with the right air outlet cavity Q; the left air outlet cavity P and the right air outlet cavity Q are respectively communicated with the other side of the upper cover gasket 702 in one direction through the umbrella-shaped reverse-flow valve 703 (the hole 713 shown in fig. 4 is used for assembling the umbrella-shaped reverse-flow valve 703); the left air outlet cavity and the right air outlet cavity are connected through a back flushing air passage which is independently communicated (the back flushing air passage is an independent external pipeline which is not shown in the figure, and a hole 711 shown in figure 4 is used for being externally connected with the back flushing air passage), and the electromagnetic valve 705 is used for controlling the opening and closing of the back flushing air passage; the upper cover gasket 702 is provided with an air inlet through hole 714 at a position close to the air collecting port; the upper cover side seal 706 fixedly connects the airway gasket sealing ring 701, the upper cover gasket 702, the umbrella-shaped reverse flow valve 703, the airway side seal sealing ring 704 and the electromagnetic valve 705 to the airway connection end L in a squeezing sealing manner.

Further, as shown in fig. 4, the arrangement of the air holes 710 on the top head gasket 702 includes: a back flush channel hole 711, a pressure equalizing hole 712, and an outlet hole 713.

It should be noted that, in the above structure, the air outlet 713 is provided to cooperate with the umbrella-shaped reverse flow valve 703 to form a one-way airflow channel; the upper cover gasket 702 and the upper cover side seal 706 seal the air inlet passage through the air passage side seal sealing ring 704; the first cover cavity 100 and the second cover cavity 200 are respectively communicated with the air inlet channel in a one-way mode through the umbrella-shaped reverse flow valve 703 (air can only flow into the air inlet channel and cannot flow back to the first cover cavity or the second cover cavity); the gas in the gas inlet channel enters the second cover cavity 200 through the gas collecting hole 714 shown in fig. 3 to realize the gas collecting function.

Therefore, when the molecular sieve tower is in the left path air inlet, air firstly flows through the umbrella-shaped backflow valve 703 impacting the left side of the first air duct 400 shown in fig. 1 and enters the air inlet channel sealed by the upper cover gasket 702 and the upper cover side seal 706 through the air duct side seal sealing ring 704; then enters the second cover cavity 200 through the gas collecting hole 714 shown in fig. 3 to realize the gas collecting function; at the moment, the electromagnetic valve 140 is not electrified, and the backwashing gas circuit keeps a closed state; when the back flushing operation needs to be performed on the right molecular sieve tower, the electromagnetic valve 140 is electrified, and the back flushing gas circuit is opened, so that part of oxygen generated by the molecular sieve tower can enter the third cover cavity through the back flushing gas circuit, and the back flushing operation is performed.

On the contrary, when the molecular sieve tower is in the right path for air intake, firstly, the air flows through the umbrella-shaped backflow valve 703 impacting the right side of the third air duct 600 shown in fig. 1 and enters the air intake channel sealed by the upper cover gasket 702 and the upper cover side seal 706 through the air duct side seal sealing ring 704; then enters the second cover cavity 200 through the gas collecting hole 714 shown in fig. 3 to realize the gas collecting function; at the moment, the electromagnetic valve 140 is not electrified, and the backwashing gas circuit keeps a closed state; when the back flushing operation needs to be performed on the left molecular sieve tower, the electromagnetic valve 140 is powered on, and the back flushing gas circuit is opened, so that part of oxygen generated by the molecular sieve tower can enter the first cover cavity through the back flushing gas circuit, and the back flushing operation is performed.

The operation can achieve the technical effect of back flushing of the left molecular sieve cavity and the right molecular sieve cavity alternately in cycles.

In the molecular sieve tower using the upper cover of the molecular sieve tower of the present application, the molecular sieves are filled in the left and right molecular sieve cavities, and the upper and lower ends of the molecular sieve cavities are respectively provided with a mesh screen for ventilating and fixing the molecular sieve particles in the middle of the cavities to ensure that the molecular sieve particles are not blown away by the compressed air; the spring is installed to the upper end of mesh screen, for molecular sieve granule exerts pressure, reduces the clearance between the molecular sieve granule, improves the efficiency of producing oxygen. The three cavities of the left molecular sieve cavity, the middle gas collection cavity and the right molecular sieve cavity are matched through the installation of the upper cover and the lower cover, and the fixation and the air tightness are realized under the action of the sealing ring, so that a complete molecular sieve tower is formed. After the upper cover is selected as the upper cover of the molecular sieve tower, complicated connecting pipelines can be reduced, the size of the molecular sieve of the oxygen generator is reduced, and the structural strength of the molecular sieve tower and the air tightness of the molecular sieve tower are improved.

The hose for connection is omitted, and the structural design space of related equipment is remarkably saved; the improved molecular sieve tower upper cover can reduce the damage probability of the pipeline, prolong the service life of related equipment and bring great convenience for future after-sale maintenance; further, the utility model provides a pipeline connection mode that the molecular sieve upper cover adopted compares and has high gas tightness before improving, can reduce gaseous kinetic energy loss, improves the production efficiency of oxygen. Furthermore, the utility model provides a make the molecular sieve tower obtain further optimization on the assembly and disassembly mode after the molecular sieve tower upper cover adopts above-mentioned structure, can save the equipment time of product by a wide margin, improve the production efficiency of stick product.

Further, after adopting above-mentioned molecular sieve tower upper cover of this application, after compressed air passed the molecular sieve tower, can produce the oxygen of certain concentration, its relevant system oxygen concrete work flow as follows:

as shown in FIG. 6, compressed air enters from the lower end of the left molecular sieve cavity, after passing through the inside molecular sieve particles, the air passes through the mesh screen, oxygen is generated at the upper part of the left molecular sieve cavity, the oxygen is accumulated to reach the upper cover of the molecular sieve tower, the oxygen enters the middle gas collecting cavity through the gas passage inside the upper cover of the molecular sieve tower, meanwhile, during the right molecular sieve cavity is in the analysis process, a small part of oxygen (not shown in the figure) enters the upper part of the right molecular sieve cavity through the small hole arranged on the gas passage gasket of the upper cover for pressure balance at the upper part of the right molecular sieve cavity in the analysis process, when the right molecular sieve cavity is completely analyzed, as shown in FIG. 7, the electromagnetic valve integrated on the side seal of the gas passage of the upper cover is opened, so that the back flushing gas passage is formed, and the oxygen generated by the left molecular sieve cavity directly enters the middle gas collecting cavity, and the other part of oxygen, and flushing the right molecular sieve cavity with oxygen to completely resolve part of nitrogen remained in the molecular sieve in the right molecular sieve cavity in the process of just naturally deflating and resolving.

In the second process, as shown in FIG. 8, compressed air enters from the lower end of the right molecular sieve tower, and after the air passes through the internal molecular sieve, oxygen is generated at the upper part of the right molecular sieve cavity, the oxygen firstly enters the middle gas collection cavity through the air passage inside the upper cover, meanwhile, in the analysis process of the left molecular sieve cavity, a small amount of oxygen (not shown in the figure) enters the upper part of the left molecular sieve cavity through the small holes arranged on the upper cover gas channel for balancing the pressure at the upper part of the tower in the analysis process of the left molecular sieve cavity, when the right cavity is resolved, as shown in fig. 9, the electromagnetic valve integrated on the upper cover gas passage is opened to form a passage for the back flushing gas passage, so that the oxygen generated by the right molecular sieve cavity directly enters the middle gas collection cavity, and the other most oxygen directly enters the left molecular sieve cavity, and flushing the left molecular sieve cavity with oxygen to completely resolve part of nitrogen remained in the molecular sieve in the left molecular sieve cavity in the process of just naturally deflating and resolving.

The left tower and the right tower are switched to work back and forth, and oxygen is continuously and stably generated by matching with the back washing process.

It should be noted that, in the above working procedure, there are several prerequisites for ensuring that this function is realized:

the structure design of the molecular sieve upper cover. The upper cover is divided into three parts: the upper cover comprises an upper cover main body, an upper cover air passage gasket and an upper cover air passage side seal. The upper cover main part is connected with the three cavities and is respectively as follows: a left molecular sieve cavity, a middle gas collection cavity and a right molecular sieve cavity. The upper part of the upper cover main body is provided with three bulges which are independent spaces and are used for enabling the left molecular sieve cavity and the right molecular sieve cavity to generate oxygen to be converged into the air passage positioned in the middle bulge. The upper cover air channel gasket, the air channel side seal and the upper cover main body are in an assembly relation and form a complete air channel together with the upper cover main body. Under the cooperation of the electromagnetic valve, the path of oxygen can be changed, and the switching between the oxygen collection and the back washing can be realized.

And (3) designing the air tightness of the molecular sieve tower. The entire molecular sieve column involves 8 main assemblies,

1) the upper cover is airtight. Three parts of an upper cover: the upper cover main body, the upper cover air channel gasket and the upper cover air channel side seal are provided with sealing ring mounting grooves in different shapes in pairs, and the three parts use special-shaped sealing rings and are sealed through fixing screws.

2) The upper cover, the left molecular sieve cavity, the middle gas collection cavity and the right molecular sieve cavity are realized by inserting structures and matching with sealing rings.

The upper cover is airtight with the left molecular sieve cavity and the right molecular sieve cavity. Firstly, the upper cover is designed with two protruding ring-shaped structures, the structures gradually shrink from the bottom to the top, the side parts are provided with recesses for fixing the sealing rings, in the assembly process, the ring-shaped structures of the upper cover are inserted into the left and right molecular sieve cavities, and the sealing rings form an airtight body with the upper cover and the cavities due to extrusion. The lower cover is the same as the upper cover, and the lower cover is also inserted into the cavity body and fixed by adopting a circular ring structure.

It should be noted that, in this embodiment, the air tightness between the upper cover and the gas collecting chamber is realized by using a surrounding-shaped sealing ring, the shape of the sealing ring is consistent with the shape of the cross section of the middle gas collecting chamber, and the sealing ring can be wrapped at the upper and lower ends of the gas collecting chamber.

The top appearance structure of the molecular sieve in this embodiment is designed to be rectangular, so that modular assembly can be conveniently realized. The molecular sieve towers with different numbers can be placed transversely or longitudinally in parallel, and the anti-skid protrusions are arranged on the two sides of the upper cover, so that a user can conveniently lift the molecular sieve towers. The modularized convenient installation or replacement is realized.

The technical effect that can reach after adopting this application above-mentioned structure is as follows:

1. the innovative air flue design integrates all pipelines in the structure of the molecular sieve tower, reduces the probability of pipeline damage, and prolongs the service life of the oxygen generator.

2. The assembly structure between the cavities of the molecular sieve tower is optimized, and good air tightness between the cavities is realized.

3. The integrated modularization can form the oxygenerator with different specifications.

The above embodiments are merely preferred embodiments of the present invention, and all changes and modifications based on the technical solutions of the present invention should not be excluded from the protection scope of the present invention.

Claims (8)

1. The molecular sieve tower upper cover is characterized in that an inner cavity of an upper cover body is divided into: the first cover cavity, the second cover cavity, the third cover cavity, the first air passage, the second air passage and the third air passage; the first cover cavity is communicated with the first air passage; the second cover cavity is communicated with a second air channel; the third cover cavity is communicated with a third air passage; the first air passage and the third air passage are respectively communicated with the second air passage through one-way valves, and the air conditioner further comprises an electromagnetic valve; a back flushing air passage which is independently communicated is arranged between the first air passage and the third air passage, and the electromagnetic valve is arranged in the second air passage and used for controlling the opening and closing of the back flushing air passage;

the top appearance structure of the molecular sieve is designed to be rectangular, so that modular assembly can be conveniently realized; the molecular sieve towers with different numbers can be placed transversely or longitudinally in parallel, and the anti-skid protrusions are arranged on the two sides of the upper cover, so that a user can conveniently lift the molecular sieve towers, and the modular convenient installation or replacement is realized.

2. The molecular sieve column upper cover according to claim 1, wherein the first gas passage and the third gas passage are respectively communicated with the second gas passage through an umbrella-shaped reverse flow valve.

3. The molecular sieve tower upper cover according to claim 2, wherein the side of the upper cover body is provided with an air passage connection end, and the air passage connection end is provided with: a left air outlet, a right air outlet and an air collecting port; the left air outlet is an external interface of the first air passage; the right air outlet is an external interface of the third air passage; the air collecting port is an external interface of the second cover cavity;

the connection structural component between the electromagnetic valve and the second air channel comprises: the air passage gasket sealing ring, the upper cover gasket, the umbrella-shaped reverse flow valve and the air passage side sealing ring are arranged on the air passage side sealing cover; an upper cover side seal is buckled on the electromagnetic valve outer cover;

a left air outlet cavity and a right air outlet cavity are arranged on one side of the upper cover gasket and are connected with the air passage connecting end in a sealing mode through the air passage gasket sealing ring; the left air outlet is only communicated with the left air outlet cavity, and the right air outlet is only communicated with the right air outlet cavity; the left air outlet cavity and the right air outlet cavity are respectively communicated with the other side of the upper cover gasket in a one-way mode through the umbrella-shaped reverse flow valve; the left air outlet cavity and the right air outlet cavity are connected through a back flushing air passage which is independently communicated, and the electromagnetic valve is used for controlling the opening and closing of the back flushing air passage; the upper cover gasket is provided with an air inlet through hole at the position close to the air collecting port; the upper cover side seal fixedly connects the air passage gasket sealing ring, the upper cover gasket, the umbrella-shaped reverse flow valve, the air passage side seal sealing ring and the electromagnetic valve to the air passage connecting end in an extrusion sealing mode.

4. The upper cover of the molecular sieve tower according to claim 1, wherein the end surface profiles of the first cover cavity and the third cover cavity are respectively matched with the upper end surface profile of the molecular sieve cavity; the end surface of the second cover cavity is matched with the upper end surface of the gas collection cavity in shape.

5. The molecular sieve tower upper cover according to claim 1, wherein the upper cover body has an outer shape that is adapted to an outer shape of an upper end surface of the molecular sieve casing or the support.

6. The upper cover of molecular sieve tower according to claim 1, wherein the upper cover body is provided with bolt connection holes.

7. The molecular sieve tower upper cover according to claim 1, wherein the inner cavity of the upper cover body is provided with ribs.

8. The upper cover of the molecular sieve tower according to claim 1, wherein the lower end surfaces of the first cover cavity, the second cover cavity and the third cover cavity are respectively provided with a sealing ring.

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