Single-end integrated small molecular sieve oxygen generation assembly convenient for replacing molecular sieve cylinder

Abstract

The utility model discloses a single-end integrated small molecular sieve oxygen generation assembly convenient for replacing a molecular sieve drum, which belongs to the technical field of production of small molecular sieve oxygen generators, and comprises a screen drum assembly, an upper end cover, a lower end cover and a control device, the control device comprises a driving motor, a driving wheel, a driven wheel, a transmission shaft, a rotary valve, a control outer drum and a control seat, the control seat is installed on the upper end cover, the control outer cylinder is installed on the control seat, the driving motor is installed on the control seat and / or the control outer cylinder, a rotating shaft of the driving motor is connected with the transmission shaft through the driving wheel and the driven wheel, and the rotating valve is arranged in the control outer cylinder and located above the control seat. The transmission shaft penetrates through a corresponding through hole in the upper end of the control outer cylinder and then is connected with the rotary valve, and corresponding air channels are arranged among the rotary valve, the control base, the upper end cover and the lower end cover. According to the utility model, a modularized single-end integrated structure is formed, so that the molecular sieve is more convenient and efficient to replace, the efficiency is obviously improved, the cost is reduced, and the application is more convenient.

Description

Technical Field

[0001] This utility model belongs to the field of production technology of small molecular sieve oxygen generators, specifically relating to a small molecular sieve oxygen generator assembly that integrates multiple molecular sieve cylinders together, and more particularly to a single-end integrated small molecular sieve oxygen generator assembly that is easy to replace molecular sieve cylinders. Background Technology

[0002] Using molecular sieves to generate oxygen is currently the mainstream method of oxygen production. An oxygen generator mainly includes a gas source component for generating compressed air (i.e., high-pressure air) and a molecular sieve oxygen generating component (also known as an oxygen concentrator) based on molecular sieve cylinders (also known as molecular sieve beds). The molecular sieve oxygen generating component includes multiple molecular sieve cylinders and a control device for controlling multiple molecular sieve cylinders to perform oxygen generation, nitrogen removal and other processes in turn. It may also include an oxygen storage cylinder or oxygen storage tank.

[0003] To facilitate portability and installation, highly integrated and compact integrated small molecular sieve oxygen generators are increasingly popular among users. Traditional integrated small molecular sieve oxygen generators typically involve mounting control devices on end caps at both ends of the molecular sieve cylinders, with rotary valves installed on each end cap. These two rotary valves are connected by a transmission rod, enabling a single drive motor to synchronously rotate them. This allows multiple molecular sieve cylinders to perform oxygen generation and nitrogen removal processes in turn. For example, utility model patents with patent number "ZL 202221828819.3" entitled "Five-Cylinder VPSA Oxygen Generator Based on Rotary Valve Control Process Conversion" and "202323099210.4" entitled "Highly Integrated Molecular Sieve Component for Oxygen Generation" are examples of this type of traditional integrated small molecular sieve oxygen generator.

[0004] Molecular sieve oxygen production utilizes the pressure swing adsorption (PSA) principle. The molecular sieve inside the sieve cylinder adsorbs nitrogen from high-pressure air, releasing a high-concentration oxygen gas. When the pressure inside the molecular sieve cylinder is released, nitrogen (which also includes carbon dioxide and other impurities; since it's primarily nitrogen, this is generally referred to as nitrogen removal) is released and extracted. This continuous cycle achieves oxygen production. Because molecular sieves are sensitive to water, and currently cannot completely remove moisture from the air, their oxygen production efficiency gradually decreases with use. At this point, the molecular sieve needs to be replaced, requiring the molecular sieve cylinder to be removed.

[0005] The aforementioned traditional integrated small molecular sieve oxygen generating unit has a monolithic structure because the control devices are installed on two end caps and the rotary valves at both ends are connected by a transmission linkage. To remove the molecular sieve cylinder, the entire oxygen generating unit must be disassembled, making the process of replacing the molecular sieve very time-consuming, labor-intensive, and inefficient. Utility Model Content

[0006] The purpose of this invention is to provide a single-end integrated small molecular sieve oxygen generator that is easy to replace molecular sieve cylinders in order to solve the above problems.

[0007] This utility model achieves the above objectives through the following technical solutions:

[0008] A single-end integrated small molecular sieve oxygen generator assembly with easy-to-replace molecular sieve cylinders includes a sieve cylinder assembly, an upper end cover, a lower end cover, and a control device. The sieve cylinder assembly is a multi-vertically penetrating molecular sieve cylinder or an outer cylinder with multiple vertically penetrating molecular sieve cavities inside. The upper end cover and the lower end cover are respectively installed at the upper and lower ends of the sieve cylinder assembly. The control device includes a drive motor, a drive wheel, a driven wheel, a transmission shaft, and a rotary valve. The control device also includes a control outer cylinder and a control seat. The control seat is installed on top of the upper end cover, and the control outer cylinder with an open lower end is installed on top of the control seat. The drive motor is installed on the control seat and / or the control outer cylinder. The shaft of the drive motor is connected to the drive wheel, and the drive wheel is meshed with the driven wheel. The driven wheel is installed at the upper end of the control outer cylinder via a rolling bearing. The driven wheel is connected to the upper end of the vertical transmission shaft. The disc-shaped rotary valve is placed inside the control outer cylinder and located... Above the control base, the lower end of the drive shaft passes through the corresponding through hole at the upper end of the control outer cylinder from top to bottom and connects to the rotary valve, but cannot rotate relative to the rotary valve. The outer wall of the control base is provided with a compressed air inlet, an oxygen outlet, and a nitrogen outlet. The upper end cover is provided with multiple upper end cover inlet / outlet holes and multiple upper end cover oxygen holes. The lower part of the rotary valve is provided with multiple guide grooves. The control base is provided with multiple gas channels that are respectively connected to the compressed air inlet, the oxygen outlet, the nitrogen outlet, the multiple guide grooves, the multiple upper end cover inlet / outlet holes, and the multiple upper end cover oxygen holes. The lower ends of the multiple upper end cover inlet / outlet holes are respectively connected to the upper ends of multiple molecular sieve cylinders or molecular sieve inner cavities of the sieve cylinder assembly. The lower end cover is provided with multiple lower end cover oxygen holes, which are respectively connected to the lower ends of the multiple upper end cover oxygen holes through multiple oxygen channels provided on the sieve cylinder assembly.

[0009] Preferably, to achieve more optimized control of oxygen production and nitrogen removal processes, the control seat has a vertically penetrating central through hole, and a control seat protruding ring protruding towards the centerline is provided in the middle section of the hole wall. The control seat protruding ring isolates the upper and lower parts of the central through hole into an air inlet slot and an oxygen outlet slot, respectively. A sealing cap is installed at the lower end of the oxygen outlet slot. Multiple vertically arranged and evenly distributed control seat inlet and outlet holes are provided on the control seat outside its central through hole. An annular control seat nitrogen removal slot is provided on the control seat outside the multiple control seat inlet and outlet holes. Multiple vertically arranged and evenly distributed control... The rotary valve has an oxygen through-hole. An oxygen settling tank is located at the center of the upper part of the rotary valve. The rotary valve has a vertically penetrating central through-hole that extends through the center of the bottom of the oxygen settling tank. An air-guiding central groove is located on the lower part of the rotary valve, outside the central through-hole. The outer walls of the opposite sides of the air-guiding central groove extend outwards to form air-guiding extended grooves. An annular nitrogen-guiding peripheral groove is located on the lower part of the rotary valve, outside the two air-guiding extended grooves. The inner walls of the opposite sides of the nitrogen-guiding peripheral groove extend inwards to form nitrogen-guiding inner grooves. The two air-guiding extended grooves and the two nitrogen-guiding inner grooves are located on the same virtual annulus. The lower part of the rotary valve is located on the... Two arc-shaped or strip-shaped oxygen guide grooves are symmetrically arranged on the outer side of the nitrogen guide peripheral groove. The bottom of each oxygen guide groove has an oxygen flow hole communicating with the oxygen settling groove. The air inlet groove communicates with the compressed air inlet, and the oxygen outlet groove communicates with the oxygen outlet. The control seat nitrogen vent groove communicates with the nitrogen outlet. The control seat nitrogen vent groove and the nitrogen guide peripheral groove are vertically correspondingly connected. The air inlet groove and the air guide center groove are vertically correspondingly connected. The upper ends of multiple control seat inlet and outlet holes are vertically correspondingly connected to two air guide outer extension grooves and two nitrogen guide inner extension grooves, respectively. The lower ends of multiple control seat inlet and outlet holes are vertically correspondingly connected to multiple upper end cap inlet and outlet grooves, respectively. The upper end of the through hole is open, and the upper ends of the multiple oxygen through holes of the control seat are respectively vertically connected to the two oxygen guide grooves. The lower ends of the multiple oxygen through holes of the control seat are respectively connected to the upper ends of the multiple oxygen through holes of the upper end cover. The upper end of the rotary valve is sealed with a rotary valve cover. An oxygen cavity is formed between the bottom of the oxygen settling tank and the rotary valve cover. The lower end of the drive shaft passes through the central through hole of the rotary valve cover and the central through hole of the rotary valve in sequence from top to bottom and is placed in the oxygen outlet groove of the control seat. The drive shaft is sealed with the rotary valve cover, the rotary valve and the convex ring of the control seat. The end of the drive shaft located below the rotary valve cover is provided with a vertical drive shaft blind hole with an open lower end.The blind hole of the drive shaft has a radial through hole at a position corresponding to the oxygen inner cavity. The above structure is largely similar to the structure of the utility model patent with patent number "ZL 202221828819.3" entitled "Five-cylinder VPSA oxygen generator based on rotary valve control process conversion," but because this application is a single-end integrated structure, some structures have been improved. Due to the close interrelationship of the related gas path structures, all structures are described in detail, resulting in a large amount of content. However, the innovative structure only differs from the original.

[0010] Note: The air guide center groove, air guide outer extension groove, nitrogen guide outer peripheral groove, nitrogen guide inner extension groove, and oxygen guide groove mentioned above are part of the multiple guide grooves below the rotary valve. The rotary valve oxygen sealing groove, pressure equalization groove, and oxygen backflush groove mentioned below are another part of the multiple guide grooves below the rotary valve. The multiple independent gas channels between the compressed air inlet, oxygen outlet, nitrogen outlet, air inlet groove, oxygen outlet groove, control seat inlet and outlet through-hole, control seat nitrogen vent groove, and control seat oxygen through-hole mentioned above are part of the multiple gas channels within the control seat. The independent gas channel between the oxygen sealing inlet and the control seat oxygen sealing groove mentioned below are another part of the multiple gas channels within the control seat.

[0011] Preferably, to facilitate assembly and achieve the function of regulating the oxygen pressure inside the oxygen chamber, a vertical mounting cylinder is provided at the upper middle part of the control outer cylinder. The driven wheel is mounted on the upper outer wall of the mounting cylinder. The upper middle part of the rotary valve cover protrudes upward to form a valve cover protrusion. The valve cover protrusion has a vertical central through hole, through which the drive shaft passes and is sealed. The upper part of the valve cover protrusion is placed inside the mounting cylinder. A pressure adjusting nut is installed inside the mounting cylinder above the valve cover protrusion. The outer circumference of the pressure adjusting nut has an external thread and is open to the airflow. The external thread is connected to the corresponding internal thread on the inner circumference of the mounting cylinder. The upper end face of the pressure adjusting nut is provided with a tool slot. The center of the bottom of the tool slot is provided with a vertically penetrating central hole through which the drive shaft passes. A thrust ball bearing is installed between the lower end of the pressure adjusting nut and the upper end of the valve cover protrusion, and the drive shaft passes through the central hole of the thrust ball bearing. A sealing ring is provided between the lower inner wall of the rotary valve cover and the upper outer wall of the rotary valve, and the valve cover can slide vertically. A compression spring is installed between the lower end of the valve cover protrusion and the bottom of the oxygen settling tank.

[0012] Preferably, in order to more reliably achieve the function of synchronously rotating the rotary valve and the rotary valve cover by driving the drive shaft, a plurality of outwardly protruding protrusions are provided on the outer circumference of the drive shaft at the position corresponding to the central through hole of the rotary valve, and a plurality of downwardly recessed grooves are provided in the middle of the bottom of the oxygen settling tank, with the plurality of protrusions respectively placed in the plurality of grooves. A plurality of outwardly protruding vertical strips are provided on the outer circumference of the drive shaft at the position corresponding to the valve cover protrusion, and a plurality of strip-shaped grooves are provided on the wall of the hole through which the center of the valve cover protrusion passes, with the plurality of protrusions respectively placed in the plurality of strip-shaped grooves.

[0013] Preferably, in order to facilitate better axial positioning of the drive shaft and easy installation of the compression spring, a drive shaft cover is provided above the bottom of the oxygen settling tank. The drive shaft passes through the central through hole of the drive shaft cover. The outer periphery of the drive shaft cover has protruding lugs on opposite sides. The circumferential wall of the oxygen settling tank has positioning grooves on opposite sides. The two lugs are respectively placed in the two positioning grooves. The lower end of the compression spring is located in the compression spring positioning groove on the drive shaft cover.

[0014] Preferably, in order to achieve better airtightness between the nitrogen venting channel and the oxygen outlet channel, thereby avoiding excessive oxygen leakage due to the pressure difference between the nitrogen venting channel and the oxygen outlet channel, the outer wall of the control seat is provided with an oxygen sealing inlet. The control seat is provided with an annular control seat oxygen sealing groove located outside the control seat nitrogen venting groove and inside the multiple control seat oxygen through holes. The control seat oxygen sealing groove is connected to the oxygen sealing inlet. The rotary valve is provided with an annular rotary valve oxygen sealing groove located outside the nitrogen guide peripheral groove and inside the two oxygen guide grooves. The control seat oxygen sealing groove and the rotary valve oxygen sealing groove are vertically corresponding and connected.

[0015] Preferably, in order to achieve the pressure equalization function, a plurality of arc-shaped pressure equalization grooves are provided on the bottom of the rotary valve at a position outside the oxygen sealing groove of the rotary valve and inside the two oxygen guide grooves. The plurality of pressure equalization grooves are located on the same virtual ring, and the two ends of each pressure equalization groove extend outward and are located on the same virtual ring with the two oxygen guide grooves.

[0016] Preferably, in order to achieve oxygen backflushing during nitrogen removal and improve the nitrogen removal effect, two arc-shaped or strip-shaped oxygen backflushing grooves are provided below the rotary valve at the position outside the outer periphery of the nitrogen guide groove and are arranged symmetrically. The bottom of the oxygen backflushing groove is provided with an oxygen backflushing hole that communicates with the oxygen settling groove. The two oxygen backflushing grooves and the two oxygen guide grooves are located on the same virtual ring.

[0017] Preferably, in order to achieve a better sealing connection, a ceramic plate and a sealing gasket are provided between the control outer cylinder and the control seat. The ceramic plate and the sealing gasket are respectively provided with a plurality of vertical through holes for corresponding communication between the rotary valve and the control seat.

[0018] Preferably, in order to facilitate the transmission connection between the driven wheel and the drive shaft, the driven wheel has a central through hole in the middle, and the upper part of the central through hole has pin slots on opposite sides. The drive shaft has a radially penetrating pin hole near the upper end, and the pin passes through the pin hole. The two ends of the pin are placed in the two pin slots. The outer circumference of the drive shaft has an external thread above the pin. A nut is fitted on the upper end of the drive shaft and threadedly connected to and presses the pin.

[0019] The beneficial effects of this utility model are as follows:

[0020] This invention integrates the control device by centrally mounting it on the upper end cover (or lower end cover) and adding a control outer cylinder and control base to assemble the various components of the control device. The assembled control device is then connected to the upper end cover, and the corresponding gas channels only need to be sealed together (by installing sealing rings at the joints). This forms a modular, single-end integrated structure. When replacing the molecular sieve, simply disassemble the control device from the upper end cover, or disassemble the upper end cover from the sieve cylinder assembly, replace the molecular sieve, and then reconnect them. This achieves convenient and efficient molecular sieve replacement, significantly improving efficiency and reducing costs. It avoids the problem of needing to completely disassemble the control components on the two end covers in traditional structures where the transmission rod connects them together. Moreover, the single-end integrated structure of this invention has a higher overall integration level, a smaller size, and is more convenient to use. Attached Figure Description

[0021] Figure 1 This is a perspective view of the single-end integrated small molecular sieve oxygen generator assembly described in this utility model, which is easy to replace the molecular sieve cylinder. The control device in the figure is not connected to the upper end cover.

[0022] Figure 2 This is a front sectional view of the assembled single-end integrated small molecular sieve oxygen generator assembly described in this utility model, which facilitates the replacement of molecular sieve cylinders.

[0023] Figure 3 This is a perspective view of the drive shaft, rotary valve cover, compression spring, drive shaft cover and rotary valve before assembly of the single-end integrated small molecular sieve oxygen generator assembly with easy replacement of molecular sieve cylinders as described in this utility model.

[0024] Figure 4This is a bottom view of the rotary valve of the single-end integrated small molecular sieve oxygen generator assembly with easy replacement of molecular sieve cylinders as described in this utility model.

[0025] Figure 5 This is a three-dimensional view of the assembled control device of the single-end integrated small molecular sieve oxygen generator assembly described in this utility model, which facilitates the replacement of molecular sieve cylinders.

[0026] Figure 6 This is a top perspective view of the control seat of the single-end integrated small molecular sieve oxygen generator assembly with easy replacement of molecular sieve cylinders as described in this utility model.

[0027] Figure 7 This is a bottom perspective view of the control seat of the single-end integrated small molecular sieve oxygen generator assembly, which facilitates the replacement of molecular sieve cylinders, as described in this utility model. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings:

[0029] like Figures 1-7 As shown, the single-end integrated small molecular sieve oxygen generator assembly of this utility model, which facilitates the replacement of molecular sieve cylinders, includes a sieve cylinder assembly 12, an upper end cover 9, a lower end cover 13, and a control device. The sieve cylinder assembly 12 is an outer cylinder (or multiple vertically penetrating molecular sieve cylinders) with multiple vertically penetrating molecular sieve cavities 41 inside. Figure 2The sieve cylinder assembly 12 is shown as a simplified schematic diagram. Only one molecular sieve cavity 41 is shown, and it is merely a simplified schematic structure. The structure of the sieve cylinder assembly 12 itself is not the innovation of this utility model, so it is not the focus and is only shown as a simplified schematic structure. The upper end cover 9 and the lower end cover 13 are respectively installed at the upper and lower ends of the sieve cylinder assembly 12. The control device includes a drive motor 53, a driving wheel 1 (teeth on the outer circumference are not shown in the figure), a driven wheel 2 (teeth on the outer circumference are not shown in the figure), a transmission shaft 3, and a rotary... The control system comprises a rotary valve 25, a control outer cylinder 6, and a control base 8. The control base 8 is mounted on the upper end cover 9 with screws. The control outer cylinder 6, with its lower opening, is mounted on the control base 8. A drive motor 53 is mounted on the control base 8 and / or the control outer cylinder 6 (the control base 8 is shown in the figure). The shaft of the drive motor 53 is connected to the drive wheel 1, which meshes with the driven wheel 2. The driven wheel 2 is mounted on the upper end of the control outer cylinder 6 via a rolling bearing 16. The driven wheel 2 is connected to the upper end of the vertical transmission shaft 3. The disc-shaped rotary valve 25 is placed within the control... The outer cylinder 6 is located inside and above the control base 8. The lower end of the drive shaft 3 passes through the corresponding through hole at the upper end of the control outer cylinder 6 from top to bottom and is connected to the rotary valve 25, but cannot rotate relative to the rotary valve 25. The outer wall of the control base 8 is provided with a compressed air inlet 52, an oxygen outlet 55, and a nitrogen outlet 51. The upper end cover 9 is provided with multiple upper end cover inlet and outlet through holes 10 and multiple upper end cover oxygen through holes 11. The lower part of the rotary valve 25 is provided with multiple guide grooves. The control base 8 is provided with holes respectively connected to the compressed air inlet 52, oxygen outlet 55, and... The nitrogen outlet 51, multiple guide grooves, multiple upper end cap inlet and outlet holes 10 and multiple upper end cap oxygen passage holes 11 are connected to multiple gas channels. The lower ends of the multiple upper end cap inlet and outlet holes 10 are respectively connected to the upper ends of multiple molecular sieve inner cavities 41 (or molecular sieve cylinders) of the sieve cylinder assembly 12. The lower end cap 13 is provided with multiple lower end cap oxygen passage holes 43. The multiple lower end cap oxygen passage holes 43 are respectively connected to the lower ends of the multiple upper end cap oxygen passage holes 11 through multiple oxygen channels 42 provided on the sieve cylinder assembly 12.

[0030] like Figures 1-7 As shown, this utility model also discloses the following more optimized specific structures:

[0031] To achieve optimized control of oxygen production and nitrogen removal processes, the control seat 8 has a vertically penetrating central through-hole. A control seat protrusion ring 40 protrudes towards the centerline in the middle section of the hole wall (lower part in the figure). The protrusion ring 40 isolates the upper and lower parts of the central through-hole of the control seat 8 into an air inlet groove 35 and an oxygen outlet groove 36, respectively. A sealing cap 37 is installed at the lower end of the oxygen outlet groove 36. Multiple vertically arranged and evenly distributed control seat air inlet and outlet through-holes 38 are located outside the central through-hole of the control seat 8. An annular control seat nitrogen removal groove 33 is located outside the multiple control seat air inlet and outlet through-holes 38 on the control seat 8. Multiple... A vertically oriented oxygen through-hole 39 is evenly distributed around the circumference of the control seat. An oxygen settling trough (not separately marked in the figure, but consistent with the marking position of the oxygen inner cavity 23 described below) is provided in the upper center of the rotary valve 25. The rotary valve 25 has a vertically penetrating central through-hole that passes through the center of the bottom of the oxygen settling trough. An air-guiding central groove 34 is provided below the rotary valve 25, located outside its central through-hole. The outer walls of the air-guiding central groove 34 on both sides extend outwards to form air-guiding extension grooves 32. An annular nitrogen-guiding peripheral groove 30 is provided below the rotary valve 25, located outside the two air-guiding extension grooves 32. The inner walls of the nitrogen-guiding peripheral groove 30 on both sides extend inwards to form nitrogen... The air-guided inner groove 48, two air-guided outer grooves 32, and two nitrogen-guided inner grooves 48 are located on the same virtual ring. Below the rotary valve 25, outside the nitrogen-guided outer peripheral groove 30, are two arc-shaped or strip-shaped oxygen-guided grooves 27 arranged symmetrically. The bottom of the oxygen-guided grooves 27 has oxygen flow holes 47 communicating with the oxygen sink. The air inlet groove 35 communicates with the compressed air inlet 52, the oxygen outlet groove 36 communicates with the oxygen outlet 55, the control seat nitrogen discharge groove 33 communicates with the nitrogen outlet 51, and the control seat nitrogen discharge groove 33 is vertically connected to the nitrogen-guided outer peripheral groove 30. The air inlet groove 35 is vertically connected to the air-guided center groove 34. The upper ends of the multiple control seat inlet and outlet holes 38 are... The control seat 8 is vertically connected to two air-guided outer grooves 32 and two nitrogen-guided inner grooves 48. The lower ends of multiple control seat inlet and outlet holes 38 are connected to the upper ends of multiple upper end cover inlet and outlet holes 10. The upper ends of multiple control seat oxygen holes 39 are vertically connected to two oxygen guide grooves 27. The lower ends of multiple control seat oxygen holes 39 are connected to the upper ends of multiple upper end cover oxygen holes 11. The upper end of the rotary valve 25 is sealed with a rotary valve cover 21. An oxygen cavity 23 is formed between the bottom of the oxygen settling tank and the rotary valve cover 21. The lower end of the drive shaft 3 passes through the central through hole of the rotary valve cover 21 and the central through hole of the rotary valve 25 from top to bottom and is placed in the oxygen outlet groove 36 of the control seat 8.The drive shaft 3 is sealed to the rotary valve cover 21, the rotary valve 25 and the control seat protrusion ring 40 respectively. The drive shaft 3 has a vertical drive shaft blind hole 19 with an open bottom end at one end located below the rotary valve cover 21. The drive shaft blind hole 19 has a radial through hole 20 at the position corresponding to the oxygen inner cavity 23 in the hole wall. Explanation: The air guide center groove 34, air guide outer extension groove 32, nitrogen guide outer peripheral groove 30, nitrogen guide inner extension groove 48, and oxygen guide groove 27 mentioned above are part of the plurality of guide grooves below the rotary valve 25. The rotary valve oxygen sealing groove 29, pressure equalization groove 28, and oxygen backflush groove 49 mentioned below are another part of the plurality of guide grooves below the rotary valve 25. The plurality of corresponding independent gas channels between the compressed air inlet 52, oxygen outlet 55, nitrogen outlet 51, air inlet groove 35, oxygen outlet groove 36, control seat inlet / outlet through hole 38, control seat nitrogen vent groove 33, and control seat oxygen through hole 39 mentioned above are part of the plurality of gas channels within the control seat 8. The independent gas channel between the oxygen sealing inlet 54 and the control seat oxygen sealing groove 31 mentioned below is another part of the plurality of gas channels within the control seat 8.

[0032] To facilitate assembly and enable the regulation of oxygen pressure within the oxygen chamber 23, a vertical mounting cylinder 18 is provided at the upper center of the control outer cylinder 6. The driven wheel 2 is mounted on the upper outer wall of the mounting cylinder 18. The upper center of the rotating valve cover 21 protrudes upward to form a valve cover protrusion 17. The valve cover protrusion 17 has a vertical central through hole through which the drive shaft 3 passes and is sealed. The upper part of the valve cover protrusion 17 is placed inside the mounting cylinder 18. A pressure adjusting nut 15 is installed inside the mounting cylinder 18 above the valve cover protrusion 17. The outer circumference of the pressure adjusting nut 15 has an external thread, which connects to the valve cover. The mounting cylinder 18 has a corresponding internal thread connection on its inner circumference. The upper end face of the pressure adjusting nut 15 is provided with a tool slot (not visible in the figure). The center of the bottom of the tool slot is provided with a vertical through hole through which the drive shaft 3 passes. A thrust ball bearing 16 is installed between the lower end of the pressure adjusting nut 15 and the upper end of the valve cover protrusion 17, and the drive shaft 3 passes through the center through hole of the thrust ball bearing 16. A sealing ring is provided between the lower inner wall of the rotary valve cover 21 and the upper outer wall of the rotary valve 25, and the valve cover protrusion 17 is able to slide vertically. A compression spring 22 is installed between the lower end of the valve cover protrusion 17 and the bottom of the oxygen settling tank.

[0033] To more reliably achieve the function of synchronously rotating the rotary valve 25 and the rotary valve cover 21 driven by the drive shaft, multiple protrusions 26 are provided on the outer circumference of the drive shaft 3 at the position corresponding to the central through hole of the rotary valve 25. Multiple recessed grooves 46 are provided in the middle of the bottom of the oxygen settling tank. The multiple protrusions 26 are respectively placed in the multiple grooves 46. Multiple vertical protrusions 45 are provided on the outer circumference of the drive shaft 3 at the position corresponding to the valve cover protrusion 17. Multiple strip-shaped grooves (not visible in the figure) are provided on the wall of the hole through the center of the valve cover protrusion 17. The multiple protrusions 45 are respectively placed in the multiple strip-shaped grooves.

[0034] To facilitate better axial positioning of the drive shaft 3 and easy installation of the compression spring 22, a drive shaft cover 24 is provided above the bottom of the oxygen settling tank. The drive shaft 3 passes through the central through hole of the drive shaft cover 24. The outer periphery of the drive shaft cover 24 has protruding lugs (not marked in the figure) on opposite sides. The circumferential wall of the oxygen settling tank has positioning grooves (not marked in the figure) on opposite sides. The two lugs are placed in the two positioning grooves respectively. The lower end of the compression spring 22 is located in the compression spring positioning groove (not marked in the figure) on the drive shaft cover 24, and the upper end of the compression spring 22 is fitted outside the protrusion below the valve cover protrusion 17.

[0035] To achieve better airtightness between the nitrogen venting channel and the oxygen outlet channel, thereby avoiding excessive oxygen leakage due to the pressure difference between the nitrogen venting channel and the oxygen outlet channel, the outer wall of the control seat 8 is provided with an oxygen sealing inlet 54. An annular control seat oxygen sealing groove 31 is provided on the control seat 8 at the position outside the control seat nitrogen venting groove 33 and inside the multiple control seat oxygen through holes 39. The control seat oxygen sealing groove 31 is connected to the oxygen sealing inlet 54. An annular rotary valve oxygen sealing groove 29 is provided below the rotary valve 25 at the position outside the nitrogen guide peripheral groove 30 and inside the two oxygen guide grooves 27. The control seat oxygen sealing groove 29 and the rotary valve oxygen sealing groove 31 are vertically connected and corresponding.

[0036] To achieve the pressure equalization function, multiple arc-shaped pressure equalization grooves 28 are provided on the bottom of the rotary valve 25, located outside the rotary valve oxygen sealing groove 29 and inside the two oxygen guide grooves 27. The multiple pressure equalization grooves 28 are located on the same virtual ring, and the two ends of each pressure equalization groove 28 extend outward and are located on the same virtual ring with the two oxygen guide grooves 27.

[0037] In order to achieve the oxygen backflush function during nitrogen purging and improve the nitrogen purging effect, two arc-shaped or strip-shaped oxygen backflush grooves 49 are provided below the rotary valve 25 on the outer side of the nitrogen guide peripheral groove 30 and are arranged symmetrically. The bottom of the oxygen backflush groove 49 is provided with an oxygen backflush hole 50 that communicates with the oxygen settling groove. The two oxygen backflush grooves 49 and the two oxygen guide grooves 27 are located on the same virtual ring.

[0038] To achieve a better sealing connection, a ceramic plate 7 and a sealing gasket (not marked in the figure) are provided between the control outer cylinder 6 and the control seat 8. The ceramic plate 7 and the sealing gasket are respectively provided with multiple vertical through holes (not marked in the figure) for corresponding communication between the rotary valve 25 and the control seat 8.

[0039] To facilitate the transmission connection between the driven wheel 2 and the drive shaft 3, the driven wheel 2 has a central through hole in the middle, and the upper sides of the central through hole have pin slots (not marked in the figure) on opposite sides. The drive shaft 3 has a radially penetrating pin through hole 44 near the upper end, and the pin 4 passes through the pin through hole 44. The two ends of the pin 4 are placed in the two pin slots. The outer circumference of the drive shaft 3 has an external thread above the pin 4. The nut 5 is fitted on the upper end of the drive shaft 3 and threadedly connected to and presses the pin 4.

[0040] like Figures 1-7As shown, in use, the compressed air inlet 52 and the oxygen sealed inlet 54 are connected to the air compressor outlet of the air source assembly (not shown in the figure), the oxygen outlet 55 is connected to the oxygen storage tank (not shown in the figure), and the nitrogen outlet 51 is connected to the vacuum pump (not shown in the figure). Each molecular sieve cavity 41 completes at least two processes in sequence: oxygen production and nitrogen removal (also known as desorption). In actual work, these processes are further divided into a more specific pressure equalization process, a pressure building adsorption process, an oxygen inlet and outlet process (corresponding to the oxygen production process), a vacuum desorption process (corresponding to the nitrogen removal process), and a backflushing desorption process. Among these, the pressure equalization process, the pressure building adsorption process, and the oxygen inlet and outlet process can be combined into an oxygen production process, and the vacuum desorption process and the backflushing desorption process can be combined into a nitrogen removal process. The specific process depends on the actual needs. For example, to achieve higher oxygen production efficiency, five molecular sieve cavities 41 can be used to complete five processes, or two molecular sieve cavities 41 can be used to complete two processes. This application uses the former, that is, five molecular sieve cavities 41 are used. The conversion between each process is achieved by the drive motor 53 driving the drive wheel 1, the driven wheel 2, the transmission shaft 3, and the rotary valve 25 to rotate, and by switching the channel between the guide groove on the rotary valve 25 and the control seat 8. The working principle is explained below using only the two main processes of one molecular sieve inner cavity 41, namely the oxygen generation process and the nitrogen removal process. The working principle of other molecular sieve inner cavities 41 can be referred to this molecular sieve inner cavity 41. For other more specific processes, please refer to the relevant content in the utility model patent with patent number "ZL 202221828819.3" and title "Five-cylinder VPSA oxygen generation device based on rotary valve control process conversion", which will not be repeated here.

[0041] When oxygen is generated in the inner cavity 41 of a certain molecular sieve, compressed air (i.e., high-pressure air) enters the molecular sieve inside the inner cavity 41 through the compressed air inlet 52, air inlet groove 35, air guide center groove 34, air guide extension groove 32, control seat inlet and outlet through hole 38, and upper end cover inlet and outlet through hole 10 in sequence. Under high pressure, nitrogen, carbon dioxide and other impurities in the air are adsorbed by the molecular sieve. The remaining high-concentration oxygen in the air passes through the molecular sieve and then enters the oxygen storage tank through the lower end cover oxygen through hole 43, oxygen channel 42, upper end cover oxygen through hole 11, control seat oxygen through hole 39, oxygen guide groove 27, oxygen flow hole 47, oxygen inner cavity 23, radial through hole 20, drive shaft blind hole 19, oxygen outlet groove 36 and oxygen outlet 55 in sequence, thereby realizing the oxygen generation function.

[0042] When nitrogen is purged from the inner cavity 41 of a molecular sieve, compressed air stops entering the compressed air inlet 52. Under the action of the vacuum pump, the nitrogen, carbon dioxide, and other impurities in the molecular sieve 41 are sequentially discharged into the air through the upper end cover inlet / outlet 10, the control seat inlet / outlet 38, the nitrogen guide inner groove 48, the nitrogen guide outer peripheral groove 30, the nitrogen outlet 51, and the vacuum pump, thus achieving the nitrogen purging function. During the nitrogen purging process, the oxygen in the oxygen inner cavity 23 sequentially enters the molecular sieve through the oxygen backflush hole 50, the oxygen backflush groove 49, the control seat oxygen throughlet 39, the upper end cover oxygen throughlet 11, the oxygen channel 42, and the lower end cover oxygen throughlet 43, and is extracted together with the nitrogen, carbon dioxide, and other impurities, achieving the purpose of oxygen backflush and realizing a better nitrogen purging effect.

[0043] When replacing the molecular sieve, simply disconnect the control seat 8 and the upper cover 9 in the control device, or disconnect the upper cover 9 and the sieve cylinder assembly 12, and then reconnect them after replacing the molecular sieve. This achieves the goal of conveniently and efficiently completing the molecular sieve replacement work, significantly improving efficiency and reducing costs.

[0044] Note: The control device described above can also be installed on the lower end cover 13, in which case the vertical relationship in the relevant structure is reversed, and this structure is substantially the same as the structure described above. Similarly, if the axial direction of the screen cylinder assembly is changed to a non-vertical direction, the corresponding structural orientation will also change, and it is also substantially the same as the structure described above.

[0045] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A single-end integrated small molecular sieve oxygen generator assembly with easily replaceable molecular sieve cylinders, comprising a sieve cylinder assembly, an upper end cover, a lower end cover, and a control device, wherein the sieve cylinder assembly is a plurality of vertically penetrating molecular sieve cylinders or an outer cylinder having a plurality of vertically penetrating molecular sieve inner cavities inside, the upper end cover and the lower end cover are respectively installed at the upper and lower ends of the sieve cylinder assembly, and the control device comprises a drive motor, a drive wheel, a driven wheel, a transmission shaft, and a rotary valve, characterized in that: The control device further includes a control outer cylinder and a control base. The control base is mounted on top of the upper end cover, and the control outer cylinder, which has an open lower end, is mounted on top of the control base. The drive motor is mounted on the control base and / or the control outer cylinder. The drive motor's shaft is connected to the driving wheel, which meshes with the driven wheel. The driven wheel is mounted on the upper end of the control outer cylinder via a rolling bearing. The driven wheel is connected to the upper end of the vertical transmission shaft. The disc-shaped rotary valve is placed inside the control outer cylinder and located above the control base. The lower end of the transmission shaft passes through a corresponding through hole at the upper end of the control outer cylinder from top to bottom and is connected to the rotary valve, but cannot rotate relative to the rotary valve. The outer wall of the control base is provided with compressed air. The system includes an air inlet, an oxygen outlet, and a nitrogen outlet. The upper cover has multiple upper cover air inlet / outlet holes and multiple upper cover oxygen outlet holes. The rotary valve has multiple guide grooves below it. The control seat has multiple gas channels that are respectively connected to the compressed air inlet, the oxygen outlet, the nitrogen outlet, the multiple guide grooves, the multiple upper cover air inlet / outlet holes, and the multiple upper cover oxygen outlet holes. The lower ends of the multiple upper cover air inlet / outlet holes are respectively connected to the upper ends of multiple molecular sieve cylinders or molecular sieve inner cavities of the sieve cylinder assembly. The lower cover has multiple lower cover oxygen outlet holes, which are respectively connected to the lower ends of the multiple upper cover oxygen outlet holes through multiple oxygen channels provided on the sieve cylinder assembly.

2. The single-end integrated small molecular sieve oxygen generator assembly with easy replacement of molecular sieve cylinders as described in claim 1, characterized in that: The control seat has a vertically penetrating central through hole, and a control seat protruding ring protruding towards the center line is provided in the middle section of the hole wall. The control seat protruding ring isolates the upper and lower parts of the central through hole into an air inlet slot and an oxygen outlet slot, respectively. A sealing cap is installed at the lower end of the oxygen outlet slot. Multiple vertically arranged and evenly distributed control seat inlet and outlet holes are provided on the control seat outside its central through hole. An annular control seat nitrogen venting slot is provided on the control seat outside the multiple control seat inlet and outlet holes. Multiple vertically arranged and evenly distributed control seat oxygen through holes are provided on the control seat outside the control seat nitrogen venting slot. An oxygen settling groove is provided in the middle of the upper part of the rotary valve. The rotary valve has a vertically penetrating central through-hole that extends through the center of the bottom of the oxygen settling tank. Below the rotary valve, outside the central through-hole, is an air-guiding central groove. The outer walls of the air-guiding central groove extend outwards on opposite sides to form air-guiding extension grooves. Below the rotary valve, outside the two air-guiding extension grooves, is an annular nitrogen-guiding peripheral groove. The inner walls of the nitrogen-guiding peripheral groove extend inwards on opposite sides to form nitrogen-guiding inner extension grooves. The two air-guiding extension grooves and the two nitrogen-guiding inner extension grooves are located on the same virtual annulus. Below the rotary valve, outside the nitrogen-guiding peripheral groove, are two symmetrically arranged arc-shaped or strip-shaped oxygen... The oxygen guide groove has an oxygen flow hole at its bottom that communicates with the oxygen settling groove. The air inlet groove is connected to the compressed air inlet, and the oxygen outlet groove is connected to the oxygen outlet. The nitrogen venting groove of the control seat is connected to the nitrogen outlet. The nitrogen venting groove of the control seat is vertically connected to the outer peripheral groove of the nitrogen guide groove. The air inlet groove is vertically connected to the central air guide groove. The upper ends of the plurality of control seat inlet and outlet holes are vertically connected to two outer air guide grooves and two inner nitrogen guide grooves, respectively. The lower ends of the plurality of control seat inlet and outlet holes are vertically connected to the upper ends of the plurality of upper end cap inlet and outlet holes, respectively. The upper ends of the plurality of control seat oxygen through holes are vertically connected to two… The oxygen guide grooves are vertically connected, and the lower ends of the oxygen through holes of the multiple control seats are respectively connected to the upper ends of the oxygen through holes of the multiple upper end caps. The upper end of the rotary valve is sealed with a rotary valve cover. An oxygen cavity is formed between the bottom of the oxygen settling tank and the rotary valve cover. The lower end of the drive shaft passes through the central through hole of the rotary valve cover and the central through hole of the rotary valve in sequence from top to bottom and is placed in the oxygen outlet groove of the control seat. The drive shaft is sealed with the rotary valve cover, the rotary valve and the convex ring of the control seat respectively. The drive shaft has a vertical blind hole with an open lower end at one end located below the rotary valve cover. A radial through hole is provided in the wall of the blind hole of the drive shaft at a position corresponding to the oxygen cavity.

3. The single-end integrated small molecular sieve oxygen generator assembly with easy replacement of molecular sieve cylinders as described in claim 2, characterized in that: The upper middle part of the control outer cylinder is provided with a vertical mounting cylinder. The driven wheel is mounted on the upper outer wall of the mounting cylinder. The upper middle part of the rotary valve cover protrudes upward to form a valve cover protrusion. The valve cover protrusion has a vertical central through hole, through which the drive shaft passes and is sealed. The upper part of the valve cover protrusion is placed inside the mounting cylinder. A pressure adjusting nut is installed inside the mounting cylinder above the valve cover protrusion. The outer circumference of the pressure adjusting nut is provided with an external thread, which connects to the inner circumference of the mounting cylinder. The corresponding internal thread connection includes a cutter groove on the upper end face of the pressure adjusting nut, a vertically penetrating central through hole at the center of the bottom of the cutter groove, through which the drive shaft passes. A thrust ball bearing is installed between the lower end of the pressure adjusting nut and the upper end of the valve cover protrusion, and the drive shaft passes through the central through hole of the thrust ball bearing. A sealing ring is provided between the lower inner wall of the rotary valve cover and the upper outer wall of the rotary valve, allowing vertical sliding. A compression spring is installed between the lower end of the valve cover protrusion and the bottom of the oxygen settling tank.

4. The single-end integrated small molecular sieve oxygen generator assembly with easy replacement of molecular sieve cylinders according to claim 3, characterized in that: The outer circumference of the drive shaft has multiple outwardly protruding bumps at positions corresponding to the central through hole of the rotary valve. The bottom of the oxygen settling tank has multiple downwardly recessed grooves, and the multiple protruding bumps are respectively placed in the multiple grooves. The outer circumference of the drive shaft has multiple outwardly protruding vertical strips at positions corresponding to the valve cover protrusion. The center of the valve cover protrusion has multiple strip-shaped grooves on the wall of the hole, and the multiple protruding strips are respectively placed in the multiple strip-shaped grooves.

5. The single-end integrated small molecular sieve oxygen generator assembly with easy replacement of molecular sieve cylinders according to claim 4, characterized in that: The oxygen settling tank has a drive shaft cover above the bottom of the tank. The drive shaft passes through the central through hole of the drive shaft cover. The outer periphery of the drive shaft cover has protruding lugs on opposite sides. The circumferential wall of the oxygen settling tank has positioning grooves on opposite sides. The two lugs are placed in the two positioning grooves respectively. The lower end of the compression spring is located in the compression spring positioning groove on the drive shaft cover.

6. The single-end integrated miniature molecular sieve oxygen generator assembly with easy replacement of molecular sieve cylinders according to any one of claims 2-5, characterized in that: The outer wall of the control seat is provided with an oxygen sealing inlet. The control seat is provided with an annular control seat oxygen sealing groove located outside the control seat nitrogen venting groove and inside the multiple control seat oxygen through holes. The control seat oxygen sealing groove is connected to the oxygen sealing inlet. The rotary valve is provided with an annular rotary valve oxygen sealing groove located outside the nitrogen guide peripheral groove and inside the two oxygen guide grooves. The control seat oxygen sealing groove and the rotary valve oxygen sealing groove are vertically connected and corresponding.

7. The single-end integrated small molecular sieve oxygen generator assembly with easy replacement of molecular sieve cylinders as described in claim 6, characterized in that: Below the rotary valve, located outside the oxygen sealing groove and inside the two oxygen guide grooves, there are multiple arc-shaped pressure equalization grooves. The multiple pressure equalization grooves are located on the same virtual ring, and the two ends of each pressure equalization groove extend outward and are located on the same virtual ring with the two oxygen guide grooves.

8. The single-end integrated small molecular sieve oxygen generator assembly with easy replacement of molecular sieve cylinders according to any one of claims 2-5, characterized in that: Below the rotary valve, located outside the nitrogen guide groove, are two arc-shaped or strip-shaped oxygen backflush grooves arranged symmetrically. The bottom of the oxygen backflush grooves is provided with oxygen backflush holes that communicate with the oxygen settling groove. The two oxygen backflush grooves and the two oxygen guide grooves are located on the same virtual ring.

9. The single-end integrated miniature molecular sieve oxygen generator assembly with easy replacement of molecular sieve cylinders according to any one of claims 2-5, characterized in that: A ceramic plate and a sealing gasket are provided between the control outer cylinder and the control base. The ceramic plate and the sealing gasket are respectively provided with a plurality of vertical through holes for corresponding communication between the rotary valve and the control base.

10. The single-end integrated miniature molecular sieve oxygen generator assembly with easy replacement of molecular sieve cylinders according to any one of claims 1-5, characterized in that: The driven wheel has a central through hole in the middle, and the upper part of the central through hole has pin slots on opposite sides. The drive shaft has a radially penetrating pin through hole near the upper end, and the pin passes through the pin through hole. The two ends of the pin are placed in the two pin slots. The outer circumference of the drive shaft has an external thread above the pin. The nut is fitted on the upper end of the drive shaft and threadedly connected to and presses the pin.

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