A continuous and stable pressure swing adsorption (PSA) oxygen production method and apparatus

Abstract

The present invention relates to the field of filtration technology, and more specifically, to a continuous and stable pressure swing adsorption oxygen production method and production device. It comprises a platform and two adsorption tower bodies, a conveying pipeline assembly for realizing pressure swing adsorption of air for oxygen production is arranged between the two adsorption tower bodies, and a molecular sieve assembly for filtering gases other than oxygen in the air is arranged inside the two adsorption tower bodies, and a lifting drive assembly is connected to the top of the molecular sieve assembly. The present invention balances the oxygen accommodating space and the impurity accommodating space, improves the stability of oxygen production, and drives the filter particles filled in the molecular sieve assembly to shake when sliding up and down, so that the filter particles are more fully in contact with the impurities in the air, improves the filtering and adsorption effect, and promotes the rapid discharge of oxygen in the upper space, improves the oxygen transmission efficiency, and is conducive to the continuity of oxygen production.

Description

Technical Field

[0001] The present invention relates to the field of filtration technology, in particular to a continuous and stable pressure swing adsorption oxygen production method and production device. Background Art

[0002] A pressure swing adsorption oxygen generator is a device used to produce high-purity oxygen. It separates oxygen from the air through molecular sieve technology and physical adsorption principles, and provides it to people who need oxygen therapy or other applications. When the current pressure swing adsorption oxygen generator is in use, first, the air is compressed into the pressure swing adsorption oxygen generator. Inside the adsorption tower equipment, the air passes through a series of molecular sieve beds. These molecular sieve beds are made of special adsorption materials and can selectively adsorb nitrogen. Nitrogen is adsorbed on the molecular sieve, and oxygen passes through the molecular sieve bed and is further collected and purified. After the adsorption bed is gradually saturated, it needs to be regenerated. At this time, the supply of compressed air is switched to another adsorption bed, and the compressed air on the bed adsorbed with nitrogen is released at the same time. The pressure between the adsorption beds changes alternately, so that nitrogen discharge and oxygen purification are carried out alternately, thereby achieving continuous output of high-quality oxygen;

[0003] When compressed air enters the adsorption tower and contacts the molecular sieve bed, the molecular sieve bed separates the adsorption tower into two spaces, the upper space containing oxygen after air filtration, and the lower space containing filtered nitrogen and other gases (gases other than oxygen). However, the positions of the molecular sieve beds in current production devices are mostly fixed, and it is not convenient to adjust the sizes of the two spaces according to the content of oxygen and nitrogen in the air, resulting in the inability to effectively and stably balance the atmospheric pressure in the adsorption tower. At the same time, the molecular sieve bed is in a static state, which is not convenient for full contact with the air, resulting in low filtration efficiency. In addition, when the filtered oxygen is in the upper space, it needs to be transported from the top of the adsorption tower to the oxygen tank for storage, which is inconvenient to drive the rapid transmission of oxygen, affecting production efficiency. In view of this, we propose a continuous and stable pressure swing adsorption oxygen production method and production device. Summary of the invention

[0004] The object of the present invention is to provide a continuous and stable pressure swing adsorption oxygen production method and production device to solve the problems raised in the above background technology.

[0005] In order to solve the above-mentioned technical problems, one of the objects of the present invention is to provide a continuous and stable pressure swing adsorption oxygen production device, comprising a platform and two adsorption tower bodies fixed on the top of the platform, a conveying pipeline assembly for realizing pressure swing adsorption of air for oxygen production is provided between the two adsorption tower bodies, and molecular sieve assemblies for filtering gases other than oxygen in the air are provided inside the two adsorption tower bodies, and a lifting drive assembly is connected to the top of the molecular sieve assembly, which operates above the molecular sieve assembly through the lifting drive assembly to drive the molecular sieve assembly to slide upward like a piston, thereby adjusting the size of the upper and lower spaces of the molecular sieve assembly, and squeezing the oxygen in the upper space to accelerate discharge.

[0006] Preferably, the delivery pipeline assembly includes a first adsorption pipeline, a first pressure-equalizing pipeline, a second adsorption pipeline, a second pressure-equalizing pipeline and a collecting pipeline, the first adsorption pipeline is used to transport air to the bottom of the inner cavity of one of the adsorption tower bodies, the first pressure-equalizing pipeline is used to connect the two adsorption tower bodies, when the internal pressure of one of the adsorption tower bodies is relatively high, the oxygen is transmitted to the bottom of the inner cavity of the other adsorption tower body for equal pressure, the second adsorption pipeline is used to transport air to the bottom of the inner cavity of the other adsorption tower body, the second pressure-equalizing pipeline is used to connect the two adsorption tower bodies, when the internal pressure of the other adsorption tower body is relatively high, the oxygen is transmitted to the bottom of the inner cavity of one of the adsorption tower bodies for equal pressure, and the collecting pipeline is used to discharge the oxygen in the space above the two adsorption tower bodies into the oxygen storage tank.

[0007] Preferably, the first adsorption pipeline includes an air intake pipeline connected to the output end of the air compressor, the end of the air intake pipeline is connected to a flow dividing pipeline, the end of the flow dividing pipeline is connected to a first input pipeline, and the end of the first input pipeline is connected to the bottom of the inner cavity of one of the adsorption tower bodies;

[0008] The second adsorption pipeline includes a second input pipeline connected to the diversion pipeline, and the second input pipeline is connected to the bottom of the inner cavity of another adsorption tower body;

[0009] The air intake pipe, the flow dividing pipe, the first input pipe and the second input pipe are all connected and provided with a solenoid valve.

[0010] Preferably, the first pressure-equalizing pipeline includes a first pressure-equalizing pipeline connected to an inner cavity near the top of one of the adsorption tower bodies, the end of the first pressure-equalizing pipeline is connected to the diversion pipeline and the second input pipeline in sequence, and a solenoid valve is provided inside the first pressure-equalizing pipeline;

[0011] The second pressure-equalizing pipeline includes a second pressure-equalizing pipe connected to the inner cavity of another adsorption tower body near the top, the end of the second pressure-equalizing pipe is connected to the diversion pipe and the first input pipe in sequence, and a solenoid valve is provided inside the second pressure-equalizing pipe.

[0012] Preferably, the collecting pipeline includes an output pipe connected to the top of one of the adsorption tower bodies and a gathering pipe connected to the top of another adsorption tower body, the gathering pipe is connected to the output pipe, and solenoid valves are also provided inside the gathering pipe and the output pipe.

[0013] Preferably, the conveying pipeline assembly also includes an exhaust pipe respectively connected to the inside of the first input pipe and the second input pipe, and the end of the exhaust pipe is connected to a filter exhaust tower for filtering and exhausting impurities, and the filter exhaust tower is supported on the top of the platform by a bracket, and the ends of the exhaust pipe close to the first input pipe and the second input pipe are connected to solenoid valves.

[0014] Preferably, the molecular sieve assembly at least comprises a piston frame sealingly sliding inside the adsorption tower body, a sieve frame is inserted inside the piston frame, a net bag is provided inside the sieve frame, and the inner cavity of the net bag is filled with a zeolite molecular sieve for filtering impurities, wherein:

[0015] A dynamic groove is formed on the inner wall of the piston frame, and a convex plate is provided on the top of the screen frame. The convex plate seals and slides inside the dynamic groove, and a plurality of elastic members are fixedly connected between the upper and lower surfaces of the convex plate and the inner end of the dynamic groove.

[0016] Preferably, a connecting frame is provided on the top of the piston frame, and the lifting drive assembly includes at least two rotating rods rotating in the inner cavity of the adsorption tower body, the lower ends of the two rotating rods are movably connected with connecting rods, the ends of the connecting rods are movably connected to the center of the connecting frame in an outwardly opened manner, and the upper ends of the two rotating rods are fixedly connected with connecting rods, the ends of the two connecting rods are rotatable and extend out of the interior of the adsorption tower body, and two mutually meshing gear plates are fixedly connected between the two connecting rods, and one end of the gear plates is connected to the motor output shaft.

[0017] Preferably, the adsorption tower body includes but is not limited to an upper shell, the lower end of the upper shell is threadedly connected to a lower shell, and the lower shell is supported on the top of the platform by a bracket.

[0018] The second object of the present invention is to provide a continuous stable pressure swing adsorption oxygen production method, which is applied to any one of the continuous stable pressure swing adsorption oxygen production devices described above, comprising the following steps:

[0019] S1. After the outside air is dried by an air compressor, it is sequentially input into the two adsorption tower bodies through the conveying pipeline assembly, so that the air enters from the bottom of the adsorption tower body, and is filtered by the molecular sieve assembly, so that oxygen is gathered in the upper space of the molecular sieve assembly, and impurities are gathered in the lower space of the molecular sieve assembly;

[0020] S2. During the filtration process, the molecular sieve assembly is driven to slide upward by the lifting drive assembly, thereby increasing the lower space and reducing the upper space, so that the upper space for oxygen and the lower space for impurities are balanced;

[0021] S3, after the oxygen is filtered out from the inside of one of the adsorption tower bodies, the oxygen is again transmitted to the inside of another adsorption tower body through the delivery pipeline assembly for pressure equalization;

[0022] S4. The oxygen accumulated in the space on the two adsorption tower bodies is also transported to the oxygen storage tank for storage with the help of the transport pipeline assembly to complete the oxygen production.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. In the continuous stable pressure swing adsorption oxygen production method and production device, the interior of the adsorption tower body is divided into an upper space and a lower space by a molecular sieve assembly, so that air enters from the bottom of the adsorption tower body and is filtered by the molecular sieve assembly, so that oxygen is gathered in the upper space of the molecular sieve assembly and impurities are gathered in the lower space of the molecular sieve assembly. When there are more impurities in the air, the molecular sieve assembly is driven to slide upward by the lifting drive assembly to increase the lower space and reduce the upper space, so that the oxygen accommodating space and the impurity accommodating space are balanced, thereby improving the stability of oxygen production and being suitable for producing oxygen from different air.

[0025] 2. In the continuous stable pressure swing adsorption oxygen production method and production device, when the air is compressed into the adsorption tower body, the molecular sieve assembly is driven to slide up and down by the lifting drive assembly, driving the filter particles filled in the molecular sieve assembly to shake, so that the filter particles can more fully contact the impurities in the air, thereby improving the filtering and adsorption effect.

[0026] 3. In the continuous stable pressure swing adsorption oxygen production method and production device, after the oxygen is filtered out in the upper space of the molecular sieve assembly, the lifting drive assembly drives the molecular sieve assembly to move upward again, and the outer wall of the molecular sieve assembly is sealed and pressed against the inner wall of the adsorption tower body, which can promote the rapid discharge of oxygen in the upper space, improve the oxygen transmission efficiency, and facilitate the continuity of oxygen production. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure assembly of the present invention;

[0028] Figure 2 It is a cross-sectional view of the structural assembly of the adsorption tower body, molecular sieve assembly and lifting drive assembly of the present invention;

[0029] Figure 3 It is a schematic diagram of the assembly structure of the molecular sieve assembly and the lifting drive assembly of the present invention;

[0030] Figure 4 For the present invention Figure 3 Schematic diagram of the structure at B;

[0031] Figure 5 For the present invention Figure 2 Schematic diagram of the structure at A;

[0032] Figure 6 It is a schematic diagram of the decomposition of the adsorption tower body structure of the present invention;

[0033] Figure 7 This is a schematic diagram for demonstrating the first adsorption pipeline of the present invention;

[0034] Figure 8 This is a schematic diagram showing the first pressure equalizing pipeline of the present invention;

[0035] Fig. 9 This is a schematic diagram for demonstrating the second adsorption pipeline of the present invention;

[0036] Fig.10 This is a schematic diagram for demonstrating the second pressure equalizing pipeline of the present invention;

[0037] Fig.11 It is a schematic diagram demonstrating the collection pipeline of the present invention.

[0038] The meaning of each number in the figure is:

[0039] 100, platform; 110, adsorption tower body; 111, upper shell; 112, lower shell; 120, delivery pipeline assembly; 121, air intake pipeline; 122, diversion pipeline; 123, first input pipeline; 124, first pressure equalizing pipeline; 125, second pressure equalizing pipeline; 126, second input pipeline; 127, discharge pipeline; 128, gathering pipeline; 129, output pipeline; 130, filter exhaust tower;

[0040] 200, molecular sieve assembly; 210, piston frame; 211, moving groove; 212, connecting frame; 220, sieve frame; 221, net bag; 222, convex plate; 223, elastic member;

[0041] 300, lifting drive assembly; 310, rotating rod; 311, connecting rod; 312, gear plate; 313, motor; 320, connecting rod. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] like Figure 1-Figure 11 As shown, one of the purposes of the present invention is to provide a continuous and stable pressure swing adsorption oxygen production device, including a platform 100 and two adsorption tower bodies 110 fixed on the top of the platform 100, a conveying pipeline assembly 120 for realizing pressure swing adsorption of air for oxygen production is provided between the two adsorption tower bodies 110, and molecular sieve assemblies 200 for filtering gases other than oxygen in the air are provided inside the two adsorption tower bodies 110, and a lifting drive assembly 300 is connected to the top of the molecular sieve assembly 200, and the lifting drive assembly 300 operates above the molecular sieve assembly 200 to drive the molecular sieve assembly 200 to slide upward like a piston, thereby adjusting the size of the upper and lower spaces of the molecular sieve assembly 200, and squeezing the oxygen in the upper space to accelerate discharge.

[0044] Specific as Figure 1-2 As shown, the present invention takes into account that when compressed air enters the adsorption tower and contacts the molecular sieve bed, the molecular sieve bed separates the adsorption tower into two spaces, the upper space contains oxygen after air filtration, and the lower space contains nitrogen and other gases other than oxygen filtered out. However, the position of the molecular sieve bed in the current production device is mostly fixed, and it is inconvenient to adjust the size of the two spaces according to the content of oxygen and nitrogen in the air, resulting in the inability to effectively and stably balance the atmospheric pressure in the adsorption tower. Therefore, the interior of the adsorption tower body 110 is divided into an upper space and a lower space by a molecular sieve assembly 200, so that air enters from the bottom of the adsorption tower body 110, and the air is filtered by the molecular sieve assembly 200, so that oxygen is gathered in the upper space of the molecular sieve assembly 200. Miscellaneous gas refers to gases other than oxygen, such as nitrogen, etc., and miscellaneous gas is used to represent the gas gathered in the lower space of the molecular sieve assembly 200 in the following. When there are more miscellaneous gases in the air, the molecular sieve assembly 200 is driven to slide upward by the lifting drive assembly 300 to increase the lower space and reduce the upper space, so that the oxygen accommodating space and the miscellaneous gas accommodating space are balanced, the stability of oxygen production is improved, and it is suitable for different air to produce oxygen at the same time;

[0045] As for how to determine whether to adjust the position of the molecular sieve assembly 200, the upper space and the lower space of the molecular sieve assembly 200 can be connected with a pressure gauge, and the gas pressure in the upper space and the lower space can be determined by the pressure gauge. If the gas pressure in the upper space and the lower space is uneven, the molecular sieve assembly 200 needs to be moved to the space with a smaller gas pressure, so as to finally achieve a balance between the upper space and the lower space;

[0046] At the same time, the molecular sieve bed is in a static state, which is not convenient for full contact with the air, resulting in low filtration efficiency. Therefore, when the air is compressed into the adsorption tower body 110, the molecular sieve assembly 200 is driven to slide up and down by the lifting drive assembly 300, driving the filter particles filled in the molecular sieve assembly 200 to shake, so that the filter particles can be more fully contacted with the impurities in the air, thereby improving the filtration and adsorption effect;

[0047] Moreover, when the filtered oxygen is in the upper space, it needs to be transported from the top of the adsorption tower to the oxygen tank for storage, which is inconvenient to drive the rapid transmission of oxygen and affects the production efficiency. Therefore, after the oxygen is filtered out in the upper space of the molecular sieve assembly 200, the lifting drive assembly 300 drives the molecular sieve assembly 200 to move upward again. The outer wall of the molecular sieve assembly 200 is sealed and pressed against the inner wall of the adsorption tower body 110, which can promote the rapid discharge of oxygen in the upper space, thereby improving the oxygen transmission efficiency and facilitating the continuity of oxygen production.

[0048] On the basis of the above, the specific structure needs to be disclosed in detail:

[0049] First, it is necessary to realize that the delivery pipeline assembly 120 can assist the production of oxygen by pressure swing adsorption, so that air can be transported between the two adsorption tower bodies 110. The structure of the delivery pipeline assembly 120 is further disclosed, such as Figure 7-Figure 11 As shown, the delivery pipeline assembly 120 includes a first adsorption pipeline, a first pressure-equalizing pipeline, a second adsorption pipeline, a second pressure-equalizing pipeline and a collection pipeline. The first adsorption pipeline is used to deliver air to the bottom of the inner cavity of one of the adsorption tower bodies 110, so that the outside space enters the bottom of the inner cavity of one of the adsorption tower bodies 110 through the air compressor, so that it passes through the corresponding molecular sieve assembly 200 for filtering operation. The first pressure-equalizing pipeline is used to connect the two adsorption tower bodies 110. When the internal pressure of one of the adsorption tower bodies 110 is relatively large, the oxygen pressure is transmitted to the bottom of the inner cavity of the other adsorption tower body 110 to achieve oxygen filtering through the molecular sieve assembly 200 in one of the adsorption tower bodies 110. It can evenly enter the bottom of the inner cavity of the other adsorption tower body 110 after being filtered by the molecular sieve assembly 200, so that the other adsorption tower body 110 can filter the oxygen again, which is beneficial to improve the purity of oxygen production. The second adsorption pipeline is used to deliver air to the bottom of the inner cavity of the other adsorption tower body 110, so that the outside space enters ... The space enters the bottom of the inner cavity of another adsorption tower body 110 through the air compressor, so that it passes through the corresponding molecular sieve component 200 for filtering operation, and different materials can be used for the above-mentioned molecular sieve component 200, so as to adsorb different impurities in the air and improve production quality. The second equalizing pressure pipeline is used to connect the two adsorption tower bodies 110. When the internal pressure of the other adsorption tower body 110 is relatively large, the oxygen equalizing pressure is transmitted to the bottom of the inner cavity of one of the adsorption tower bodies 110, so that the oxygen filtered by the molecular sieve component 200 in the other adsorption tower body 110 can evenly enter the bottom of the inner cavity of one of the adsorption tower bodies 110, so that the other adsorption tower body 110 can filter the oxygen again, which is beneficial to improve the purity of oxygen production and balance the pressure at the same time. The collecting pipeline is used to discharge the oxygen in the space above the two adsorption tower bodies 110 into the oxygen storage tank, so that the oxygen produced by filtering the two adsorption tower bodies 110 is discharged from the collecting pipeline to meet the oxygen production.

[0050] Specific as Figure 7 and Fig. 9 As shown, in order to meet the filtering operation of the outside air, it is necessary to disclose the first adsorption pipeline and the second adsorption pipeline, the first adsorption pipeline includes an air intake pipeline 121 connected to the output end of the air compressor, the end of the air intake pipeline 121 is connected to a shunt pipeline 122, the end of the shunt pipeline 122 is connected to a first input pipeline 123, and the end of the first input pipeline 123 is connected to the bottom of the inner cavity of one of the adsorption tower bodies 110;

[0051] The second adsorption pipeline includes a second input pipeline 126 connected to the diversion pipeline 122, and the second input pipeline 126 is connected to the bottom of the inner cavity of another adsorption tower body 110;

[0052] The air intake pipe 121, the flow dividing pipe 122, the first input pipe 123 and the second input pipe 126 are all connected and provided with a solenoid valve;

[0053] When air is introduced into the bottom of the inner cavity of one of the adsorption tower bodies 110, only the solenoid valves in the air intake pipe 121, the shunt pipe 122 and the first input pipe 123 are opened to make them internally connected, and the air compressor drives the external air into the first input pipe 123 first, and then enters into one of the adsorption tower bodies 110 through the shunt pipe 122 and the first input pipe 123, so that the air enters into one of the adsorption tower bodies 110 for filtering operation;

[0054] When introducing air into the bottom of the inner cavity of another adsorption tower body 110, only the solenoid valves in the air intake pipe 121, the bypass pipe 122 and the second input pipe 126 are opened to connect them internally. The air compressor first drives the outside air into the first input pipe 123, and then enters into the other adsorption tower body 110 through the bypass pipe 122 and the second input pipe 126, so that the air enters the other adsorption tower body 110 for filtering operation.

[0055] Specific as Figure 8 and Fig.10As shown, in order to satisfy the pressure equalization function of the two adsorption tower bodies 110, it is necessary to disclose the first pressure equalization pipeline and the second pressure equalization pipeline, so that the first pressure equalization pipeline includes a first pressure equalization pipeline 124 connected to the inner cavity near the top of one of the adsorption tower bodies 110, and the ends of the first pressure equalization pipeline 124 are connected to the shunt pipeline 122 and the second input pipeline 126 in sequence, and a solenoid valve is arranged inside the first pressure equalization pipeline 124. When one of the adsorption tower bodies 110 needs to filter air under pressure, only the solenoid valves of the first pressure equalization pipeline 124, the shunt pipeline 122 and the second input pipeline 126 are opened to connect them internally, so that the oxygen in one of the adsorption tower bodies 110 passes through the first pressure equalization pipeline 124, the shunt pipeline 122 and the second input pipeline 126 in sequence under pressure, and is input into the other adsorption tower body 110 for secondary filtration, which not only realizes pressure equalization, but also improves production quality;

[0056] The second pressure-equalizing pipeline includes a second pressure-equalizing pipe 125 connected to the inner cavity near the top of another adsorption tower body 110, and the end of the second pressure-equalizing pipe 125 is connected to the shunt pipe 122 and the first input pipe 123 in sequence, and a solenoid valve is provided inside the second pressure-equalizing pipe 125. When the other adsorption tower body 110 needs to filter air with equal pressure, only the solenoid valves of the second pressure-equalizing pipe 125, the shunt pipe 122 and the first input pipe 123 are opened to connect them internally, so that the oxygen in the other adsorption tower body 110 passes through the second pressure-equalizing pipe 125, the shunt pipe 122 and the first input pipe 123 in sequence under the action of pressure, and is input into one of the adsorption tower bodies 110 for secondary filtration, which not only achieves equal pressure but also improves production quality.

[0057] Specific as Fig.11 As shown, the oxygen filtered in the space above the inner cavity of the two adsorption tower bodies 110 needs to be discharged for storage, and a collection pipeline is specifically disclosed. The collection pipeline includes an output pipeline 129 connected to the top of one of the adsorption tower bodies 110 and a gathering pipeline 128 connected to the top of the other adsorption tower body 110. The gathering pipeline 128 is connected to the output pipeline 129, and solenoid valves are also provided inside the gathering pipeline 128 and the output pipeline 129. When collecting the filtered oxygen, only the solenoid valves in the gathering pipeline 128 and the output pipeline 129 are opened to make the end of the output pipeline 129 connected to the oxygen storage tank, and the oxygen in the space above the two adsorption tower bodies 110 is sucked in and stored through the air pump in the oxygen storage tank to ensure the structural integrity.

[0058] After filtering the air inside the adsorption tower body 110 to enrich the oxygen in the upper space, the impurities in the lower space need to be discharged. Therefore, the conveying pipeline assembly 120 also includes a discharge pipe 127 connected to the inside of the first input pipe 123 and the second input pipe 126 respectively. The end of the discharge pipe 127 is connected to a filter exhaust tower 130 for filtering and discharging impurities. The filter exhaust tower 130 is supported on the top of the platform 100 by a bracket, and the ends of the discharge pipe 127 close to the first input pipe 123 and the second input pipe 126 are connected to electromagnetic valves. When it is necessary to clear the impurities in the lower space of the inner cavity of the adsorption tower body 110, only the electromagnetic valve on the discharge pipe 127 is opened to connect the filter exhaust tower 130 with the bottom of the inner cavity of the adsorption tower body 110, and the impurities are led out through the discharge pipe 127 by the pump body in the filter exhaust tower 130 to meet the discharge of impurities. When the impurities are discharged, multiple filter layers can be provided in the filter exhaust tower 130 to adsorb and filter the impurities to avoid air pollution.

[0059] It is worth noting that in order to realize that the molecular sieve assembly 200 can filter the space entering the adsorption tower body 110 to generate oxygen, it is necessary to further disclose the structure of the molecular sieve assembly 200, please refer to Figure 2-Figure 3 As shown, the molecular sieve assembly 200 at least includes a piston frame 210 that is sealed and slidable inside the adsorption tower body 110, a sieve frame 220 is inserted inside the piston frame 210, a net bag 221 is provided inside the sieve frame 220, and the inner cavity of the net bag 221 is filled with a zeolite molecular sieve for filtering impurities. After dry air enters the adsorption tower body 110, the air is adsorbed by the zeolite molecular sieve in the net bag 221. The zeolite molecular sieve has a strong adsorption capacity for nitrogen, and oxygen is less adsorbed, so that the impurities are located in the lower space of the piston frame 210, and the oxygen is enriched in the upper space of the piston frame 210, so that the production of oxygen is realized, and the oxygen flows out from the top of the adsorption tower to complete the collection, wherein:

[0060] Since the net bag 221 moves up and down with the piston frame 210, the zeolite molecular sieve inside can be disturbed, but the disturbance effect is limited. Therefore, in order to further improve the filtering effect, Figure 4 As shown, a movable groove 211 is opened on the inner wall of the piston frame 210, and a convex plate 222 is provided on the top of the screen frame 220. The convex plate 222 slides in a sealed manner inside the movable groove 211, and a plurality of elastic members 223 are fixedly connected between the upper and lower surfaces of the convex plate 222 and the inner cavity end of the movable groove 211. As the piston frame 210 moves up and down, the screen frame 220 compresses and stretches the elastic members 223 under the action of inertia, driving the convex plate 222 to vibrate inside the movable groove 211, further disturbing the zeolite molecular sieve in the net bag 221, thereby improving the contact effect with the air.

[0061] Further, the lifting drive assembly 300 can drive the piston frame 210 to move up and down inside the adsorption tower body 110, thereby changing the size of the upper space and the lower space, and can drive the piston frame 210 to assist in oxygen collection efficiency, see Figure 3 and Figure 5 As shown, the structure of the lifting drive assembly 300 is further disclosed. A connecting frame 212 is provided on the top of the piston frame 210. The lifting drive assembly 300 at least includes two rotating rods 310 rotating in the inner cavity of the adsorption tower body 110, and the lower ends of the two rotating rods 310 are movably connected to the connecting rod 320. The ends of the connecting rod 320 are movably connected to the center of the connecting frame 212 in an outwardly open manner, and the upper ends of the two rotating rods 310 are fixedly connected to the connecting rod 311. The ends of the two connecting rods 311 are rotated to extend out of the adsorption tower body 110, and two mutually meshing gear plates 312 are fixedly connected between the two connecting rods 311, and one end of the gear plate 312 is connected to the output shaft of the motor 313, and the gear plate 312 is driven by the output shaft of the motor 313 to mesh and rotate, thereby driving the connecting rod 311 to rotate inside the adsorption tower body 110, so that the rotating rod 310 rotates accordingly, pulling the lower end of the connecting rod 320 to move up and down (when the motor drives the connecting rod 311 to rotate, it will drive the rotating rod 310 The connecting rod 311 is flipped around its axis to raise the end of the rotating rod 310. Since the two ends of the connecting rod 320 are movably connected to the end of the rotating rod 310 and the connecting frame 212 respectively, the connecting rod 320 is adaptively raised along with the end of the rotating rod 310 to pull the connecting rod 320 upward. Conversely, when the rotating rod 310 rotates in the opposite direction, the connecting rod 320 is pushed downward), thereby driving the piston frame 210 to move up and down, so that the net bag 221 can move up and down, changing the upper space and lower space with the inner cavity of the adsorption tower body 110. In addition, the piston frame 210 slides in a sealed manner in the inner cavity of the adsorption tower body 110, and the oxygen produced by squeezing can be quickly discharged as the adsorption tower body 110 moves upward, thereby improving the collection efficiency.

[0062] In addition, since the molecular sieve assembly 200 is inside the adsorption tower body 110 and filters impurities in the air for a long time, the zeolite molecular sieve in the net bag 221 will reduce the filtering function. Therefore, the zeolite molecular sieve needs to be replaced regularly. In order to facilitate the disassembly of the adsorption tower body 110, Figure 6As shown, the adsorption tower body 110 includes but is not limited to the upper shell 111, and the lower end of the upper shell 111 is threadedly connected to the lower shell 112, and the lower shell 112 is supported on the top of the platform 100 by a bracket. When the zeolite molecular sieve in the net bag 221 needs to be replaced or repaired, the lower shell 112 or the upper shell 111 can be rotated to separate the threads of the two, thereby exposing the space inside the adsorption tower body 110, and as the lifting drive assembly 300 drives the molecular sieve assembly 200 to move downward, the molecular sieve assembly 200 extends out of the lower shell 112, which is further conducive to more convenient replacement.

[0063] The second object of the present invention is to provide a continuous stable pressure swing adsorption oxygen production method, which is applied to any one of the above-mentioned continuous stable pressure swing adsorption oxygen production devices, comprising the following steps:

[0064] S1. After the outside air is dried by an air compressor, it is sequentially input into the two adsorption tower bodies 110 through the delivery pipeline assembly 120, so that the air enters from the bottom of the adsorption tower body 110, and is filtered through the molecular sieve assembly 200, so that oxygen is gathered in the upper space of the molecular sieve assembly 200, and impurities are gathered in the lower space of the molecular sieve assembly 200;

[0065] S2. During the filtration process, the molecular sieve assembly 200 is driven to slide upward by the lifting drive assembly 300, thereby increasing the lower space and reducing the upper space, so that the upper space for oxygen and the lower space for impurities are balanced;

[0066] S3, after the oxygen is filtered out from the inside of one of the adsorption tower bodies 110, the oxygen is again transmitted to the inside of the other adsorption tower body 110 through the delivery pipeline assembly 120 for pressure equalization;

[0067] S4. The oxygen accumulated in the space above the two adsorption tower bodies 110 is also transported to the oxygen storage tank for storage by means of the transport pipeline assembly 120, thereby completing the oxygen production.

[0068] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A continuous stable pressure swing adsorption oxygen production device, comprising a platform (100) and two adsorption tower bodies (110) fixed on the top of the platform (100), characterized in that: A conveying pipeline assembly (120) for realizing oxygen production by pressure swing adsorption of air is provided between the two adsorption tower bodies (110); a molecular sieve assembly (200) for filtering gases other than oxygen in the air is provided inside the two adsorption tower bodies (110); a lifting drive assembly (300) is connected to the top of the molecular sieve assembly (200); the lifting drive assembly (300) operates above the molecular sieve assembly (200) to drive the molecular sieve assembly (200) to slide upward in a piston-like manner, thereby adjusting the size of the upper space and the lower space of the molecular sieve assembly (200), and squeezing the oxygen in the upper space to accelerate discharge; The molecular sieve assembly (200) comprises at least a piston frame (210) sealingly sliding inside the adsorption tower body (110), a sieve frame (220) being inserted inside the piston frame (210), a net bag (221) being provided inside the sieve frame (220), and an inner cavity of the net bag (221) being filled with a zeolite molecular sieve for filtering impurities, wherein: A movable groove (211) is formed on the inner wall of the piston frame (210), a convex plate (222) is formed on the top of the screen frame (220), the convex plate (222) is sealingly slidable inside the movable groove (211), and a plurality of elastic members (223) are fixedly connected between the upper and lower surfaces of the convex plate (222) and the inner end of the movable groove (211); A connecting frame (212) is provided at the top of the piston frame (210), and the lifting drive assembly (300) comprises at least two rotating rods (310) rotating in the inner cavity of the adsorption tower body (110), the lower ends of the two rotating rods (310) are movably connected to connecting rods (320), the ends of the connecting rods (320) are movably connected to the center of the connecting frame (212) in an outwardly splayed manner, and the upper ends of the two rotating rods (310) are fixedly connected to connecting rods (311), the ends of the two connecting rods (311) are rotatably extended out of the adsorption tower body (110), and two mutually meshing gear plates (312) are fixedly connected between the two connecting rods (311), and the end of one of the gear plates (312) is connected to the output shaft of the motor (313).

2. The continuous stable pressure swing adsorption oxygen production device according to claim 1 is characterized in that: The delivery pipeline assembly (120) comprises a first adsorption pipeline, a first pressure-equalizing pipeline, a second adsorption pipeline, a second pressure-equalizing pipeline and a collection pipeline. The first adsorption pipeline is used to deliver air to the bottom of the inner cavity of one of the adsorption tower bodies (110). The first pressure-equalizing pipeline is used to connect the two adsorption tower bodies (110). When the internal pressure of one of the adsorption tower bodies (110) is relatively high, oxygen is transmitted to the bottom of the inner cavity of the other adsorption tower body (110) for equal pressure. The second adsorption pipeline is used to deliver air to the bottom of the inner cavity of the other adsorption tower body (110). The second pressure-equalizing pipeline is used to connect the two adsorption tower bodies (110). When the internal pressure of the other adsorption tower body (110) is relatively high, oxygen is transmitted to the bottom of the inner cavity of one of the adsorption tower bodies (110) for equal pressure. The collection pipeline is used to discharge oxygen in the space above the two adsorption tower bodies (110) into an oxygen storage tank.

3. The continuous stable pressure swing adsorption oxygen production device according to claim 2 is characterized in that: The first adsorption pipeline comprises an air intake pipeline (121) connected to the output end of the air compressor, the end of the air intake pipeline (121) is connected to a flow distribution pipeline (122), the end of the flow distribution pipeline (122) is connected to a first input pipeline (123), and the end of the first input pipeline (123) is connected to the bottom of the inner cavity of one of the adsorption tower bodies (110); The second adsorption pipeline comprises a second input pipeline (126) connected to the flow diversion pipeline (122), and the second input pipeline (126) is connected to the bottom of the inner cavity of another adsorption tower body (110); The air intake pipe (121), the flow diversion pipe (122), the first input pipe (123) and the second input pipe (126) are all connected and provided with a solenoid valve.

4. The continuous stable pressure swing adsorption oxygen production device according to claim 3 is characterized in that: The first pressure-equalizing pipeline comprises a first pressure-equalizing pipeline (124) connected to an inner cavity near the top of one of the adsorption tower bodies (110), the end of the first pressure-equalizing pipeline (124) being connected to the flow-dividing pipeline (122) and the second input pipeline (126) in sequence, and a solenoid valve is provided inside the first pressure-equalizing pipeline (124); The second pressure-equalizing pipeline comprises a second pressure-equalizing pipe (125) connected to the inner cavity of another adsorption tower body (110) near the top, the end of the second pressure-equalizing pipe (125) being connected to the branch pipe (122) and the first input pipe (123) in sequence, and a solenoid valve is provided inside the second pressure-equalizing pipe (125).

5. The continuous stable pressure swing adsorption oxygen production device according to claim 4, characterized in that: The collecting pipeline comprises an output pipe (129) connected to the top of one of the adsorption tower bodies (110) and a gathering pipe (128) connected to the top of another of the adsorption tower bodies (110); the gathering pipe (128) is connected to the output pipe (129), and electromagnetic valves are also provided inside the gathering pipe (128) and the output pipe (129).

6. The continuous stable pressure swing adsorption oxygen production device according to claim 5, characterized in that: The delivery pipeline assembly (120) further comprises an exhaust pipe (127) which is connected to the inside of the first input pipe (123) and the second input pipe (126) respectively; the end of the exhaust pipe (127) is connected to a filter exhaust tower (130) for filtering and exhausting impurities; the filter exhaust tower (130) is supported on the top of the platform (100) by means of a bracket; and the ends of the exhaust pipe (127) close to the first input pipe (123) and the second input pipe (126) are both connected to solenoid valves.

7. The continuous stable pressure swing adsorption oxygen production device according to claim 6, characterized in that: The adsorption tower body (110) comprises an upper shell (111), the lower end of the upper shell (111) being threadedly connected to a lower shell (112), and the lower shell (112) being supported on the top of the platform (100) by means of a bracket.

8. A method for realizing continuous stable pressure swing adsorption oxygen production, applied to the continuous stable pressure swing adsorption oxygen production device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, drying the outside air with the aid of an air compressor, and then sequentially inputting the air into the two adsorption tower bodies (110) through the delivery pipeline assembly (120), so that the air enters from the bottom of the adsorption tower body (110), and is filtered through the molecular sieve assembly (200), so that oxygen is accumulated in the upper space of the molecular sieve assembly (200), and impurities are accumulated in the lower space of the molecular sieve assembly (200); S2. During the filtration process, the molecular sieve assembly (200) is driven to slide upward by the lifting drive assembly (300), thereby increasing the lower space and reducing the upper space, so that the upper space for accommodating oxygen and the lower space for accommodating impurities are balanced; S3, after the oxygen is filtered out from the inside of one of the adsorption tower bodies (110), the oxygen is again transmitted to the inside of the other adsorption tower body (110) through the transmission pipeline assembly (120) for pressure equalization; S4. The oxygen accumulated in the spaces above the two adsorption tower bodies (110) is also transported to the oxygen storage tank for storage by means of the transport pipeline assembly (120), thereby completing oxygen production.

Images