Flow-controllable pressure swing adsorption nitrogen making equipment

Abstract

The utility model relates to the technical field of nitrogen making equipment, in particular to flow-controllable pressure swing adsorption nitrogen making equipment, which comprises an adsorption cylinder and a storage cylinder, a shell is fixedly communicated and connected between the adsorption cylinder and the storage cylinder, two extension plates are symmetrically distributed on the surface of the shell in the axial direction of the shell, and the two extension plates are arranged on the surface of the shell. Extension openings are symmetrically distributed in the surface of the shell in the direction perpendicular to the axis of the shell, the surface of each extension opening is fixedly connected with an interface flange, a movable wheel is movably arranged in the shell, a rotating shaft is fixedly connected to the center of the movable wheel, and a plurality of first sliding grooves are formed in the surface of the movable wheel in the circumferential direction. A movable plate is slidably connected into each first sliding groove, each movable plate is attached to the inner surface of the shell, the space between the movable wheel and the shell has a containing difference by changing the height of the circle center of the rotating shaft, the movable wheel is made to rotate, and therefore the gas volume at the inlet and outlet position is adjusted, and the flow is adjusted in a disguised mode.

Description

Technical Field

[0001] The utility model relates to the technical field of nitrogen production equipment, in particular to flow-controllable pressure swing adsorption nitrogen production equipment. Background Art

[0002] Nitrogen production equipment uses air as raw material and uses physical methods to separate the oxygen and nitrogen in it. Gases with smaller diameters diffuse faster and enter the molecular sieve solid phase more, so that nitrogen-enriched components can be obtained in the gas phase. After a period of time, the molecular sieve's adsorption of oxygen reaches equilibrium. According to the characteristics of the carbon molecular sieve's different adsorption amounts of adsorbed gas at different pressures, the pressure is reduced to release the carbon molecular sieve's adsorption of oxygen. This process is called regeneration. The pressure swing adsorption method usually uses two towers in parallel, alternating between pressurized adsorption and decompression regeneration to obtain a continuous nitrogen flow. In the prior art, the two towers in the pressure swing adsorption method screen nitrogen through carbon molecular sieves. At the input end of the two towers, the air input needs to maintain stability. During the nitrogen preparation process, the air input amount may change with the adjustment of the upper equipment, causing the input flow of the dual towers to fluctuate.

[0003] Chinese patent application number CN218421917U discloses a flow-adjustable pressure swing adsorption nitrogen generator, which relates to the technical field of nitrogen generators. The device comprises a screening tower, a gas reserve tank mounted on its side, a pressure-stabilizing compartment fixedly connected to its lower end, and a first and second input valves mounted on its side. The screening tower is provided with brown plates at its upper and lower ends, an alumina barrier at its lower end, and a carbon molecular sieve fixedly mounted inside the screening tower. The top of the screening tower is provided with an output valve, and the upper end of the gas reserve tank is provided with an inlet valve.

[0004] However, the above has the following shortcomings:

[0005] 1. The above-mentioned patent requires the installation of a larger buffer gas tank to provide sufficient gas to regulate the stability of the airflow. Although it can achieve the effect of regulating the airflow to a certain extent, the risk of gas leakage increases due to the installation of an additional gas tank, and the stable operation of the pressure stabilization work cannot be guaranteed, which does not meet the use requirements.

[0006] 2. The above patent increases the footprint of the device by providing a gas tank for regulating the air pressure. In addition, in order to meet the conditions of the above patent, additional gas tanks are required, which increases the basic cost of using the device, as well as the subsequent inspection and maintenance costs, and does not meet economic needs. Utility Model Content

[0007] In order to overcome the deficiencies of the prior art, the utility model solves the technical problem of providing an adjustable variable-center runner and changing the eccentric distance of the center of the circle so that the runner controls the amount of gas inlet and outlet, thereby changing the gas flow rate. Moreover, the adjustable variable-center runner is small and does not require an additional tank body, thereby reducing the cost of use and maintenance.

[0008] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a flow-controllable pressure swing adsorption nitrogen production equipment, comprising an adsorption cylinder and a storage cylinder, wherein the adsorption cylinder and the storage cylinder are fixedly connected with a shell, the shell surface is symmetrically distributed with two extension plates in the axial direction of the shell, the shell surface is symmetrically distributed perpendicular to the axial direction of the shell, each of the extension ports is fixedly connected to the surface of the interface flange, a movable wheel is movably provided in the shell, a rotating shaft is fixedly connected at the center of the movable wheel, a plurality of slide grooves are circumferentially distributed on the surface of the movable wheel, a movable plate is slidably connected in each of the slide grooves, and each of the movable plates is in contact with the inner surface of the shell.

[0009] Furthermore, one end of a spring is fixedly connected in each slide groove, and the other end of each spring is fixedly connected to the spring surface that is slidably connected in the corresponding slide groove, and a rubber head is fixedly connected to the contact surface between the movable plate and the shell.

[0010] Furthermore, the surfaces of the two extension plates are fixedly connected with outer plates, each of the outer plates is slidably connected with a movable block inside the extension plate, each of the movable blocks is rotatably connected with a movable wheel, the length and width of the movable block are both larger than the diameter of the shell, and two slide grooves are opened on the surfaces of the two outer plates, and the rotating shaft passes through and is slidably connected in the two slide grooves.

[0011] Furthermore, a sealing groove 1 is provided on the surface of each movable block, and a sealing strip is fixedly connected to the sealing groove 1 on the surface of the movable block at the corresponding position in each extension plate. Sealing grooves 2 are symmetrically distributed on the surface of the movable wheel at the position of each movable block, and a sealing ring is fixedly connected to the sealing groove 2 on the surface of the corresponding movable wheel of each movable block.

[0012] Furthermore, the surfaces of the two outer plates are fixedly connected with fixed block one, the lower ends of the two fixed blocks are fixedly connected with the cylinder body of the hydraulic cylinder, the telescopic ends of the two hydraulic cylinders are respectively fixedly connected with fixed block two and fixed block three, and the rotating shaft rotates to connect fixed block two and fixed block three.

[0013] Furthermore, the rotating shaft passes through and rotatably connects to the fixed block three, the surface of the fixed block three is rotatably connected to a coupling sleeve, the coupling sleeve is rotatably connected to the detection end of the detector, the rotating shaft is transmission-connected to the detection end of the detector, and the detector is fixedly connected to the three surfaces of the fixed block with three fixed plates distributed circumferentially.

[0014] Furthermore, the two interface flange surfaces are fixedly connected to two transport pipes, which are respectively fixedly connected to the lower ends of the adsorption cylinder and the storage cylinder. The adsorption cylinder and the storage cylinder surfaces are respectively fixedly connected to two support seats.

[0015] In summary, compared with the prior art, the beneficial effects of the present invention are:

[0016] (1) A variable-center wheel that can change the eccentric distance of the center of the circle is used to change the gas flow rate by intuitively changing the volume of gas entering and exiting, thereby achieving the purpose of controlling the airflow. The use of small equipment reduces the risk of leakage in large airtight regulating tanks, ensures stable operation, and meets usage requirements.

[0017] (2) The use of small equipment reduces the footprint of the entire device, lowering the basic operating costs and subsequent maintenance costs of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the overall three-dimensional schematic diagram of this patent.

[0019] Figure 2 This is a three-dimensional schematic diagram of the main part of this patent.

[0020] Figure 3 for Figure 2 Side view of the main part of the patent.

[0021] Figure 4 for Figure 3 Stereoscopic cross-sectional view at AA in the middle.

[0022] Figure 5 This is an exploded view of the side planing structure.

[0023] Figure 6 This is a side-section exploded stereoscopic view of the internal structure of the main part of this patent.

[0024] Figure 7 This is a three-dimensional half-section exploded view of the moving part.

[0025] Explanation of the reference numerals: housing 10; extension plate 11; extension opening 12; interface flange 13; outer plate 14; fixed block 15; hydraulic cylinder 16; fixed block 2 17; fixed block 3 18; coupling sleeve 19; detector 20; fixed plate 21; movable wheel 22; slide 1 23; spring 24; movable plate 25; rubber head 26; rotating shaft 27; slide 2 28; movable block 29; sealing groove 1 30; sealing strip 31; sealing groove 2 32; sealing ring 33; support seat 34; adsorption cylinder 35; storage cylinder 36; transport pipe 37. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0027] like Figure 1 As shown, a flow-controllable pressure swing adsorption nitrogen production equipment includes an adsorption cylinder 35 and a storage cylinder 36. A support base 34 is fixed to the lower end of the adsorption cylinder 35 and the storage cylinder 36 respectively. The center of the lower surface of the adsorption cylinder 35 and the storage cylinder 36 are respectively connected and fixedly connected with a transport pipe 37. The two transport pipes 37 are connected and fixedly connected with a shell 10. The surface of the shell 10 is symmetrically distributed and fixedly connected with extension plates 11 along the axial direction. The surface of the shell 10 is symmetrically distributed and fixedly connected with two extension ports 12 at the midpoint between the two extension plates 11 perpendicular to the axis. The surface of each extension port 12 is connected and fixedly connected with an interface flange 13, and the surface of each interface flange 13 is fixedly connected with a transport pipe 37.

[0028] By connecting the adsorption cylinder 35 and the storage cylinder 36 to the housing 10 , the airflow in the adsorption cylinder 35 and the storage cylinder 36 can be regulated through the housing 10 .

[0029] like Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, the surface of each extension plate 11 is fixedly connected to the outer plate 14, and a movable block 29 is slidably connected between each extension plate 11 and the outer plate 14. A movable wheel 22 is rotatably connected to the center of each movable block 29, and a rotating shaft 27 is fixedly connected to the center of the movable wheel 22. A sealing groove 23 is provided on the surface of the movable wheel 22. A sealing ring 33 is fixedly connected to the corresponding sealing groove 232 at the center of each movable block 29. A sealing groove 130 is provided on the surface of each movable block 29. A sealing strip 31 is fixedly connected to the inner surface of each extension plate 11 at the corresponding sealing groove 130. A sliding groove 28 rotatably and slidably connected to the rotating shaft 27 is provided on the surface of each outer plate 14.

[0030] By sliding the movable block 29 inside the extension plate 11 and the outer plate 14, the rotating shaft 27 moves with the movable wheel 22, so that the eccentric distance between the movable wheel 22 and the shell 10 changes, thereby achieving the purpose of changing the gas flow rate. The sealing strip 31 and the sealing ring 33 are provided to prevent the device from leaking during movement.

[0031] like Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown, a plurality of slide grooves 23 are distributed circumferentially on the surface of the movable wheel 22. One end of a spring 24 is fixedly connected at the center of each slide groove 23. The other end of each spring 24 is fixedly connected to a movable plate 25. A rubber head 26 is fixedly connected to the joint between each movable plate 25 and the inner surface of the shell 10. Both sides of each movable plate 25 are tightly fitted to the surface of the movable block 29 at the corresponding position.

[0032] Through the eccentrically arranged movable wheel 22, after the gas enters the shell 10, the air pressure imbalance on the upper and lower surfaces causes the movable wheel 22 to rotate, so that a fixed amount of airflow pushes the movable plate 25 on the surface of the movable wheel 22, and rotates until it leaves the shell 10 to control the passage of a specified amount of gas, thereby achieving the purpose of controlling the gas flow rate.

[0033] like Figure 2 and Figure 5 As shown. The surfaces of the two outer plates 14 are respectively fixedly connected to fixed blocks 15 above the rotating shaft 27. The lower ends of the two fixed blocks 15 are respectively fixedly connected to the cylinder body of a hydraulic cylinder 16. The telescopic ends of the two hydraulic cylinders 16 are respectively fixedly connected to fixed blocks 3 18 and fixed blocks 2 17. The rotating shaft 27 is rotatably connected within the fixed block 2 17. The fixed block 2 17 is slidably connected to the surface of the outer plate 14. The rotating shaft 27 passes through and is rotatably connected to the fixed block 3 18. One end of the rotating shaft 27 passing through the fixed block 3 18 is transmission-connected to a coupling sleeve 19. The detection end of a detector 20 is transmission-connected to the coupling sleeve 19. Three fixed plates 21 are fixedly connected to the surface of the detector 20 distributed circumferentially. The three fixed plates 21 fix the detector 20 at a height concentric with the rotating shaft 27.

[0034] In this embodiment, initially, the hydraulic cylinder 16 is in a fully retracted state, so that the rotating shaft 27 is at a concentric height within the housing 10, and each spring 24 is compressed to accumulate elasticity.

[0035] During use, the staff connects and fixes the shell 10 to the transport pipe 37 that is connected and fixed to the lower end of the adsorption cylinder 35 and the storage cylinder 36 through each interface flange 13. At this time, the staff injects gas into the adsorption cylinder 35, so that a large air pressure difference is generated in the adsorption cylinder 35, causing the carbon molecular sieve in the adsorption cylinder 35 to filter oxygen molecules, so that a large amount of nitrogen molecules are deposited in the adsorption cylinder 35. At this time, since the rotating shaft 27 is at the same height as the center of the circle in the shell 10, the gas pressure on the surface of the movable plate 25 is equal, and the movable wheel 22 will not rotate due to the movable plate 25, so that the adsorption cylinder 35 continues to filter oxygen molecules and filters out a large amount of nitrogen molecules.

[0036] When the nitrogen molecules reach a predetermined value, the hydraulic cylinder 16 drives the fixed block 2 17 and the fixed block 3 18 to move downward, so that there is a height difference between the rotating shaft 27 and the center of the circle in the shell 10, so that the movable wheel 22 is eccentric to the extension plate 11. When the movable wheel 22 moves downward, the rubber head 26 on the top of the movable plate 25 at the uppermost end of the movable wheel 22 in the shell 10 does not fit the surface of the shell 10, so that the spring 24 at the lower end of the movable plate 25 releases its elasticity, pushing up the movable plate 25, so that the rubber head 26 on the surface of the movable plate 25 fits the inner surface of the shell 10 again, achieving good airtightness.

[0037] Since the movable wheel 22 moves, causing the movable wheel 22 to be eccentric with the shell 10, each movable plate 25 extends out of the surface of the movable wheel 22 by a different distance, and the volume of gas that can be accommodated between each three movable plates 25 is different, so that the pressure on the surface of the movable plate 25 is different, so that the upper movable plate 25 rotates along the gas inlet direction, and the lower movable plate 25 rotates along the gas outlet direction, so that the movable wheel 22 rotates, so that the gas volume input and output of the two interface flanges 13 of the inlet and outlet are changed, thereby achieving the effect of regulating the airflow.

[0038] After changing the volume of the airflow passing through the housing 10 , nitrogen molecules are allowed to enter the storage cylinder 36 at a set flow rate.

[0039] When the nitrogen production process is completed, a large number of oxygen molecules are attached to the surface of the carbon molecular sieve, and a large number of nitrogen molecules are squeezed into the storage cylinder 36. At this time, the hydraulic cylinder 16 contracts to drive the fixed block 2 17 and the fixed block 3 18 to rise, so that the rotating shaft 27 reaches a concentric height with the shell 10, so that the movable plate 25 at the upper end of the surface of the movable wheel 22 is restricted by the inner surface of the shell 10, compressing the spring 24 inward, so that the spring 24 accumulates elasticity, and at this time the exposed area of each movable plate 25 is consistent, so that the gas volume between every three movable plates 25 in the shell 10 is consistent, so that the air pressure difference is 0, so that the movable wheel 22 is not subjected to force and stops rotating. At this time, gas no longer passes through the two interface flanges 13, and the nitrogen used in the storage cylinder 36 is extracted at this time, achieving the purpose of pressure swing adsorption collection and nitrogen production.

[0040] After the collection is completed, the storage cylinder 36 is opened so that the storage cylinder 36 is at normal atmospheric pressure. At this time, the hydraulic cylinder 16 is relaxed to drive the fixed block 2 17 and the fixed block 3 18 to move downward, so that the movable wheel 22 rotates eccentrically, so that the oxygen on the carbon molecular sieve in the adsorption cylinder 35 is separated because the carbon molecular sieve cannot reach the adsorption pressure, so that the carbon molecular sieve function is regenerated, which is convenient for the next pressure swing adsorption nitrogen production work.

[0041] When the carbon molecular sieve is regenerated, the hydraulic cylinder 16 contracts and drives the device in the housing 10 to return to its initial state, so as to facilitate the next nitrogen production operation.

[0042] Since fluctuations are likely to occur during nitrogen production, the output of nitrogen molecules is unstable, resulting in excessive nitrogen molecules deposited in the adsorption cylinder 35 and explosion. A detector 20 is fixedly connected to the surface of the sub-fixing block 18, so that the output speed of the device in the shell 10 can be detected, and the drive of the hydraulic cylinder 16 can be adjusted in real time to ensure the stability of the device during nitrogen production.

[0043] The hydraulic cylinder 16 , detector 20 , adsorption cylinder 35 , and storage cylinder 36 are all existing mature technologies and will not be described in detail herein.

[0044] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of the components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0045] It should be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or system. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the product or system comprising the element.

[0046] The above description shows and describes several preferred embodiments of the present application. However, as previously mentioned, it should be understood that the present application is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present application can be used in various other combinations, modifications, and environments and can be modified within the scope of the application concept described herein through the above teachings or technology or knowledge in the relevant field. Modifications and changes made by those skilled in the art that do not depart from the spirit and scope of the present application should be protected by the claims appended hereto.

Claims

1. A flow-controllable pressure swing adsorption nitrogen production device, comprising an adsorption cylinder (35) and a storage cylinder (36), characterized in that: The adsorption cylinder (35) and the storage cylinder (36) are fixedly connected with a shell (10), and the surface of the shell (10) is symmetrically provided with two extension plates (11) in the axial direction of the shell (10), and the surface of the shell (10) is symmetrically provided with extension openings (12) perpendicular to the axial direction of the shell (10), and each of the extension openings (12) is fixedly connected with an interface flange (13), and a movable wheel (22) is movably provided in the shell (10), and a rotating shaft (27) is fixedly connected at the center of the movable wheel (22), and a plurality of slide grooves (23) are circumferentially distributed on the surface of the movable wheel (22), and a movable plate (25) is slidably connected in each of the slide grooves (23), and each of the movable plates (25) is attached to the inner surface of the shell (10).

2. The flow-controllable pressure swing adsorption nitrogen production equipment according to claim 1, characterized in that: One end of a spring (24) is fixedly connected in each of the slide grooves (23), and the other end of each of the springs (24) is fixedly connected to the surface of the spring (24) slidably connected in the corresponding slide groove (23). A rubber head (26) is fixedly connected at the contact surface between the movable plate (25) and the shell (10).

3. The flow-controllable pressure swing adsorption nitrogen production equipment according to claim 2, characterized in that: The surfaces of the two extension plates (11) are fixedly connected with outer plates (14), and each outer plate (14) is slidably connected with a movable block (29) inside the extension plate (11). Each movable block (29) is rotatably connected with a movable wheel (22). The length and width of the movable block (29) are both greater than the diameter of the shell (10). The surfaces of the two outer plates (14) are provided with two slide grooves (28), and the rotating shaft (27) passes through and is slidably connected in the two slide grooves (28).

4. The flow-controllable pressure swing adsorption nitrogen production equipment according to claim 3, characterized in that: A sealing groove (30) is provided on the surface of each movable block (29); a sealing strip (31) is fixedly connected to the position of the sealing groove (30) on the surface of the corresponding movable block (29) in each extension plate (11); sealing grooves (32) are symmetrically distributed on the surface of the movable wheel (22) at the position of each movable block (29); and a sealing ring (33) is fixedly connected to the sealing groove (32) on the surface of the corresponding movable wheel (22) of each movable block (29).

5. The flow-controllable pressure swing adsorption nitrogen production equipment according to claim 4, characterized in that: The surfaces of the two outer plates (14) are fixedly connected with fixed blocks 1 (15), the lower ends of the two fixed blocks 1 (15) are fixedly connected with the cylinder body of the hydraulic cylinder (16), the telescopic ends of the two hydraulic cylinders (16) are respectively fixedly connected with fixed blocks 2 (17) and fixed blocks 3 (18), and the rotating shaft (27) is rotatably connected to fixed blocks 2 (17) and fixed blocks 3 (18).

6. The flow-controllable pressure swing adsorption nitrogen production equipment according to claim 5, characterized in that: The rotating shaft (27) passes through and is rotatably connected to the fixed block three (18); the surface of the fixed block three (18) is rotatably connected to a coupling sleeve (19); the detection end of the detector (20) is rotatably connected inside the coupling sleeve (19); the rotating shaft (27) is transmission-connected to the detection end of the detector (20); the detector (20) and the surface of the fixed block three (18) are fixedly connected with three fixed plates (21) distributed circumferentially.

7. The flow-controllable pressure swing adsorption nitrogen production equipment according to claim 1, characterized in that: Two transport pipes (37) are fixedly connected to the surfaces of the two interface flanges (13), and the two transport pipes (37) are fixedly connected to the lower ends of the adsorption cylinder (35) and the storage cylinder (36), respectively. Two support seats (34) are fixedly connected to the surfaces of the adsorption cylinder (35) and the storage cylinder (36), respectively.

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