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

Abstract

The invention discloses a single-end integrated small molecular sieve oxygen generation assembly facilitating replacement of a molecular sieve cylinder, and belongs to the technical field of production of small molecular sieve oxygen generators, the single-end integrated small molecular sieve oxygen generation assembly comprises a screen cylinder 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 cylinder 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. A modularized single-end integrated structure is formed, the molecular sieve is more convenient and efficient to replace, the efficiency is remarkably improved, the cost is reduced, and application is more convenient.

Description

Technical Field

[0001] The present invention belongs to the technical field of production of small molecular sieve oxygen generators, and specifically relates to a small molecular sieve oxygen generator component integrating multiple molecular sieve cartridges, and more particularly to a single-end integrated small molecular sieve oxygen generator component that is convenient for replacing molecular sieve cartridges. Background Art

[0002] The use of molecular sieves to produce oxygen is the current mainstream method of oxygen production. The oxygen generator mainly includes an air source component for generating compressed air (i.e., high-pressure air) and a molecular sieve oxygen production component (also called an oxygen concentrator) based on a molecular sieve cylinder (also called a molecular sieve bed); wherein the molecular sieve oxygen production component includes a plurality of molecular sieve cylinders and a control device that controls the plurality of molecular sieve cylinders to perform oxygen production, nitrogen exhaust and other processes in turn, and may also include an oxygen storage cylinder or an oxygen storage tank.

[0003] In order to facilitate carrying and installation, small integrated molecular sieve oxygen production components with high integration and small size are becoming more and more popular among users. Traditional integrated small molecular sieve oxygen production components are all achieved by installing the control device on the end caps at both ends of the molecular sieve cylinder, and the two end caps are respectively installed with rotary valves, and the two rotary valves are connected by a transmission connecting rod, so as to achieve the function of driving the two rotary valves to rotate synchronously through a driving motor, thereby achieving the purpose of controlling multiple molecular sieve cylinders to perform oxygen production, nitrogen exhaust and other processes in turn. For example, the utility model patent with patent number "ZL 202221828819.3" and the name "Five-cylinder VPSA oxygen production device based on rotary valve control process conversion" and the utility model patent with patent number "202323099210.4" and the name "Highly integrated molecular sieve assembly for oxygen production" are both traditional integrated small molecular sieve oxygen production components of this structure.

[0004] Molecular sieve oxygen production adopts the principle of pressure swing adsorption. The molecular sieve in the molecular sieve cylinder adsorbs the nitrogen in the high-pressure air and the discharged gas is high-concentration oxygen. After the pressure in the molecular sieve cylinder is relieved, the nitrogen (including carbon dioxide and other impurities, because it is mainly nitrogen, it is generally called nitrogen exhaust) is released and extracted, and the purpose of oxygen production is achieved through continuous cycle and alternation. Since the molecular sieve is sensitive to water and it is currently impossible to completely remove moisture from the air, the molecular sieve will cause the oxygen production efficiency to gradually decrease as the use time increases. At this time, the molecular sieve needs to be replaced. To replace the molecular sieve, the molecular sieve cylinder needs to be removed first.

[0005] However, the above-mentioned traditional integrated small molecular sieve oxygen production assembly has a control device installed on two end covers respectively, and the rotary valves at both ends are connected by a transmission connecting rod. Therefore, the entire molecular sieve oxygen production assembly is an integrally connected structure. To remove the molecular sieve cartridge, the entire oxygen production assembly must be disassembled, resulting in a very time-consuming and labor-intensive process of replacing the molecular sieve and low efficiency. Summary of the invention

[0006] The purpose of the present invention is to provide a single-end integrated small molecular sieve oxygen production component that is easy to replace the molecular sieve cartridge in order to solve the above-mentioned problem.

[0007] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0008] A single-end integrated small molecular sieve oxygen-generating assembly that is easy to replace a molecular sieve cylinder, 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 with a plurality of vertically penetrating molecular sieve inner cavities arranged inside, the upper end cover and the lower end cover are respectively mounted on the upper end and the lower end of the sieve cylinder assembly, the control device comprises a driving motor, a driving wheel, a driven wheel, a transmission shaft and a rotary valve, the control device also comprises a control outer cylinder and a control seat, the control seat is mounted on the upper end of the upper end cover, the control outer cylinder with an opening at the lower end is mounted on the control seat, the drive motor is mounted on the control seat and / or the control outer cylinder, the rotating shaft of the drive motor is connected to the driving wheel, the driving wheel is meshedly connected to the driven wheel, the driven wheel is mounted on the upper end of the control outer cylinder through a rolling bearing, the driven wheel is connected to the upper end of the vertical transmission shaft, and the disc-shaped rotary valve is placed in the control outer cylinder and located at Above the control seat, the lower end of the transmission shaft passes through the corresponding through hole at the upper end of the control outer cylinder from top to bottom and is connected to the rotary valve and cannot rotate relative to the rotary valve. The outer wall of the control seat is provided with a compressed air inlet, an oxygen outlet and a nitrogen exhaust outlet. The upper end cover is provided with a plurality of upper end cover inlet and exhaust through holes and a plurality of upper end cover oxygen through holes. A plurality of guide grooves are provided below the rotary valve. A plurality of gas channels are provided in the control seat, which are respectively connected with the compressed air inlet, the oxygen outlet, the nitrogen exhaust outlet, the plurality of guide grooves, the plurality of upper end cover inlet and exhaust through holes and the plurality of upper end cover oxygen through holes. The lower ends of the plurality of upper end cover inlet and exhaust through holes are respectively connected with the upper ends of the plurality of molecular sieve cylinders or the molecular sieve inner cavities of the sieve cylinder assembly. The lower end cover is provided with a plurality of lower end cover oxygen through holes, and the plurality of lower end cover oxygen through holes are respectively connected with the lower ends of the plurality of upper end cover oxygen through holes through a plurality of oxygen channels provided on the sieve cylinder assembly.

[0009] Preferably, in order to achieve more optimized process control effects such as oxygen production and nitrogen exhaust, the control seat is provided with a vertically penetrating central through hole and the middle section of the hole wall of the central through hole is provided with a control seat convex ring protruding toward the center line direction, the control seat convex ring separates the upper and lower parts of the central through hole of the control seat into an air inlet groove and an oxygen outlet groove respectively, and a sealing gland is installed at the lower end of the oxygen outlet groove, and the control seat is provided with a plurality of vertical and circumferentially uniformly distributed control seat inlet and exhaust through holes at the position outside the central through hole, and a circular control seat nitrogen exhaust groove is provided at the position outside the plurality of control seat inlet and exhaust through holes, and a plurality of vertical and circumferentially uniformly distributed control seat nitrogen exhaust grooves are provided at the position outside the control seat nitrogen exhaust groove. An oxygen through hole is provided on the seat, an oxygen precipitate is provided in the middle of the upper part of the rotary valve, the rotary valve is provided with a vertically penetrating central through hole and the central through hole passes through the center position of the bottom of the oxygen precipitate, an air guide central groove is provided at the position outside the central through hole below the rotary valve, the outer groove walls on the opposite sides of the air guide central groove are partially extended outward to form air guide epitaxial grooves respectively, an annular nitrogen guide peripheral groove is provided at the position outside the two air guide epitaxial grooves below the rotary valve, the inner groove walls on the opposite sides of the nitrogen guide peripheral groove are partially extended inward to form nitrogen guide inner grooves respectively, the two air guide epitaxial grooves and the two nitrogen guide inner grooves are located on the same virtual ring, the lower part of the rotary valve is located at the Two arc-shaped or strip-shaped oxygen guide grooves are symmetrically arranged at the outer side of the nitrogen guide peripheral groove, the bottom of the oxygen guide groove is provided with an oxygen flow hole connected to the oxygen sedimentation groove, the air inlet groove is connected to the compressed air inlet, the oxygen outlet groove is connected to the oxygen outlet, the control seat nitrogen exhaust groove is connected to the nitrogen outlet, the control seat nitrogen exhaust groove is vertically correspondingly connected to the nitrogen guide peripheral groove, the air inlet groove is vertically correspondingly connected to the air guide central groove, the upper ends of the plurality of control seat air inlet and exhaust through holes can be respectively connected to the two air guide outer extension grooves and the two nitrogen guide inner extension grooves in a vertical correspondence, and the lower ends of the plurality of control seat air inlet and exhaust through holes are respectively connected to the plurality of upper end cover air inlet and exhaust The upper ends of the through holes are connected, the upper ends of the plurality of control seat oxygen through holes can be respectively connected with the two oxygen guide grooves in a vertical direction, the lower ends of the plurality of control seat oxygen through holes are respectively connected with the upper ends of the plurality of upper end cover oxygen through holes, the upper end of the rotary valve is sealed and connected with a rotary valve cover, an oxygen inner cavity is formed between the bottom of the oxygen sedimentation tank and the rotary valve cover, the lower end of the transmission shaft passes through the central through hole of the rotary valve cover and the central through hole of the rotary valve from top to bottom in sequence and is then placed in the oxygen outlet groove of the control seat, the transmission shaft is sealed and connected with the rotary valve cover, the rotary valve and the control seat convex ring respectively, one end of the transmission shaft located below the rotary valve cover is provided with a vertical transmission shaft blind hole with an opening at the lower end,A radial through hole is provided in the hole wall of the blind hole of the transmission shaft at a position corresponding to the oxygen inner cavity. The above structure is similar to the relevant structure of the utility model patent with patent number "ZL 202221828819.3" and name "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. Since the relevant gas path structures are closely related to each other, all structures are described in detail, resulting in more content, but the innovative structure only has the different parts between the two.

[0010] Note: The above-mentioned air guide central groove, air guide epitaxial groove, nitrogen guide peripheral groove, nitrogen guide inner extension groove and oxygen guide groove are part of the multiple guide grooves under the above-mentioned rotary valve, and the rotary valve oxygen sealing groove, pressure equalizing groove and oxygen backflush groove in the following content are another part of the multiple guide grooves under the above-mentioned rotary valve; the multiple corresponding independent gas channels between the above-mentioned compressed air inlet, oxygen outlet, nitrogen exhaust port, air inlet groove, oxygen outlet groove, control seat inlet and exhaust through holes, control seat nitrogen exhaust groove and control seat oxygen through hole are part of the multiple gas channels in the above-mentioned control seat, and the independent gas channel between the oxygen sealing inlet and the control seat oxygen sealing groove in the following content is another part of the multiple gas channels in the above-mentioned control seat.

[0011] Preferably, in order to facilitate assembly and realize the function of regulating the oxygen pressure in the oxygen inner cavity, a vertical mounting cylinder is provided in the middle of the upper end of the control outer cylinder, the driven wheel is mounted on the upper outer wall of the mounting cylinder, the middle of the upper end of the rotary valve cover protrudes upward to form a valve cover boss, the valve cover boss is provided with a vertical center through hole and the transmission shaft passes through the center through hole and is sealed and connected, the upper part of the valve cover boss is placed in the mounting cylinder, and a pressure regulating nut is installed in the mounting cylinder at a position above the valve cover boss, the circumferential outer wall of the pressure regulating nut is provided with an external thread and is through-threaded. The external thread is connected with the corresponding internal thread on the circumferential inner wall of the mounting cylinder, the upper end face of the pressure regulating nut is provided with a knife groove, the center position of the bottom of the knife groove is provided with a vertically penetrating central through hole and the transmission shaft passes through the central through hole, a thrust ball bearing is installed between the lower end of the pressure regulating nut and the upper end of the valve cover boss and the transmission 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 and can slide vertically, and a compression spring is installed between the lower end of the valve cover boss and the bottom of the oxygen sedimentation tank.

[0012] Preferably, in order to more reliably realize the function of the transmission shaft driving the rotary valve and the rotary valve cover to rotate synchronously, a plurality of outwardly protruding bumps are provided at positions on the circumferential outer wall of the transmission shaft corresponding to the central through hole of the rotary valve, a plurality of downwardly recessed grooves are provided in the middle of the bottom of the oxygen sedimentation tank, and the plurality of bumps are respectively placed in the plurality of grooves, a plurality of outwardly protruding vertical strips are provided at positions on the circumferential outer wall of the transmission shaft corresponding to the valve cover boss, a plurality of strip grooves are provided on the hole wall through which the center of the valve cover boss passes, and the plurality of strip grooves are respectively placed in the plurality of strip grooves.

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

[0014] Preferably, in order to achieve better airtightness between the nitrogen exhaust channel and the oxygen outlet channel, thereby avoiding the problem of excessive oxygen leakage due to the pressure difference between the nitrogen exhaust channel and the oxygen outlet channel, an oxygen sealing air inlet is provided on the outer wall of the control seat, and an annular control seat oxygen sealing groove is provided on the control seat at a position outside the control seat nitrogen exhaust groove and inside a plurality of control seat oxygen through holes, and the control seat oxygen sealing groove is communicated with the oxygen sealing air inlet, and an annular rotary valve oxygen sealing groove is provided below the rotary valve at a position outside the nitrogen guide peripheral groove and inside the two oxygen guide grooves, and the control seat oxygen sealing groove and the rotary valve oxygen sealing groove are vertically correspondingly connected.

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

[0016] Preferably, in order to realize the oxygen backflush function during nitrogen discharge to improve the nitrogen discharge effect, two arc-shaped or strip-shaped and symmetrically arranged oxygen backflush grooves are provided below the rotary valve and located outside the nitrogen guide peripheral groove. The bottom of the oxygen backflush groove is provided with an oxygen backflush hole connected to the oxygen sedimentation tank, and the two oxygen backflush grooves and the two oxygen guide grooves are located on the same virtual ring.

[0017] Preferably, in order to achieve a better sealing connection function, a ceramic plate and a sealing gasket are further provided between the control outer cylinder and the control seat, and 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 function between the driven wheel and the transmission shaft, a central through hole is provided in the middle of the driven wheel and latch grooves are provided on opposite sides of the upper part of the hole wall of the central through hole, a radially through latch hole is provided near the upper end of the transmission shaft and the latch passes through the latch hole, both ends of the latch are placed in the two latch grooves, an external thread is provided on the circumferential outer wall of the transmission shaft at a position above the latch, and a nut is sleeved on the outside of the upper end of the transmission shaft and is threadedly connected to and tightens the latch.

[0019] The beneficial effects of the present invention are:

[0020] The present invention centrally installs the control device on the upper end cover (or the lower end cover), and adds a control outer cylinder and a control seat to integrate and 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 and connected accordingly (sealing rings can be installed at the butt joint to achieve sealing connection), so as to form a modular single-end integrated structure. When replacing the molecular sieve, it is only necessary to disassemble the control device from the upper end cover, or disassemble the upper end cover from the sieve cylinder assembly, and then connect them accordingly after replacing the molecular sieve, thereby achieving the purpose of conveniently and efficiently completing the molecular sieve replacement work, significantly improving efficiency, reducing costs, and avoiding the problem that the transmission rod in the traditional structure connects the control components on the two end covers together and needs to be completely disassembled; and the single-end integrated structure adopted by the present invention has higher overall integration, smaller volume, and is more convenient in application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a stereoscopic diagram of a single-end integrated small molecular sieve oxygen production assembly for easy replacement of molecular sieve cartridges according to the present invention, in which the control device is not connected to the upper end cover;

[0022] Figure 2 It is a front cross-sectional view of the assembled single-end integrated small molecular sieve oxygen production component for easy replacement of molecular sieve cartridges according to the present invention;

[0023] Figure 3 It is a stereoscopic diagram of the drive shaft, rotary valve cover, compression spring, drive shaft gland and rotary valve of the single-end integrated small molecular sieve oxygen production assembly for easy replacement of the molecular sieve cartridge of the present invention before assembly;

[0024] Figure 4 It is a bottom view of the rotary valve of the single-end integrated small molecular sieve oxygen production assembly for easy replacement of the molecular sieve cartridge according to the present invention;

[0025] Figure 5 It is a stereoscopic diagram of the control device of the single-end integrated small molecular sieve oxygen production assembly for easy replacement of the molecular sieve cartridge according to the present invention after assembly;

[0026] Figure 6 It is a top perspective view of the control seat of the single-end integrated small molecular sieve oxygen production assembly for easy replacement of the molecular sieve cartridge according to the present invention;

[0027] Figure 7 It is a bottom-up stereoscopic view of a control seat of a single-end integrated small-sized molecular sieve oxygen production assembly for easy replacement of a molecular sieve cartridge according to the present invention. DETAILED DESCRIPTION

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

[0029] like Figure 1-Figure 7 As shown, the single-end integrated small molecular sieve oxygen production assembly for easy replacement of the molecular sieve cylinder of the present invention comprises 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 a plurality of vertically penetrating molecular sieve cylinders) with a plurality of vertically penetrating molecular sieve inner cavities 41 therein. Figure 2The sieve drum assembly 12 in the figure is a simple schematic diagram, and the internal molecular sieve inner cavity 41 only shows one and only a simple schematic structure. The structure of the sieve drum assembly 12 itself is not the innovation of the present invention, so it is not the focus, and only a simple schematic structure is shown; the upper end cover 9 and the lower end cover 13 are respectively installed at the upper end and the lower end of the sieve drum assembly 12, and the control device includes a driving motor 53, a driving wheel 1 (the gear teeth on the circumferential outer wall are not shown in the figure), a driven wheel 2 (the gear teeth on the circumferential outer wall are not shown in the figure), a transmission shaft 3, and a rotary valve 25, control outer cylinder 6 and control seat 8, control seat 8 is installed on the upper end cover 9 by screws, control outer cylinder 6 with lower opening is installed on the control seat 8, drive motor 53 is installed on control seat 8 and / or control outer cylinder 6 (control seat 8 in the figure), the rotating shaft of drive motor 53 is connected with driving wheel 1, driving wheel 1 is meshed with driven wheel 2, driven wheel 2 is installed on the upper end of control outer cylinder 6 through rolling bearing 16, driven wheel 2 is connected with the upper end of vertical transmission shaft 3, disc-shaped rotary valve 25 is placed on control outer cylinder The control seat 8 is provided with a plurality of guide grooves below the rotary valve 25, and the ... The nitrogen exhaust port 51, the plurality of guide grooves, the plurality of upper end cover air inlet and exhaust through holes 10 and the plurality of upper end cover oxygen through holes 11 are correspondingly connected to the plurality of gas passages, the lower ends of the plurality of upper end cover air inlet and exhaust through holes 10 are respectively connected to the upper ends of the plurality of molecular sieve inner cavities 41 (or molecular sieve cylinders) of the sieve drum assembly 12, the lower end cover 13 is provided with a plurality of lower end cover oxygen through holes 43, and the plurality of lower end cover oxygen through holes 43 are respectively connected to the lower ends of the plurality of upper end cover oxygen through holes 11 through a plurality of oxygen channels 42 provided on the sieve drum assembly 12.

[0030] like Figure 1-Figure 7 As shown, the present invention also discloses the following more optimized specific structures:

[0031] In order to achieve more optimized process control effects such as oxygen production and nitrogen exhaust, the control seat 8 is provided with a vertically penetrating central through hole and the middle section of the hole wall of the central through hole (the lower middle part in the figure) is provided with a control seat convex ring 40 protruding toward the center line direction, and the control seat convex ring 40 separates 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, and a sealing gland 37 is installed at the lower end of the oxygen outlet groove 36. The control seat 8 is provided with a plurality of vertical and circumferentially evenly distributed control seat inlet and exhaust through holes 38 at the outside of the central through hole, and a circular control seat nitrogen exhaust groove 33 is provided at the outside of the plurality of control seat inlet and exhaust through holes 38 on the control seat 8, and a plurality of control seat nitrogen exhaust grooves 33 are provided at the outside of the control seat nitrogen exhaust groove 33 on the control seat 8. A control seat oxygen through hole 39 is vertically and evenly distributed along the circumference, an oxygen precipitation groove is provided in the middle of the upper part of the rotary valve 25 (not separately marked in the figure, consistent with the marked position of the oxygen inner cavity 23 described below), the rotary valve 25 is provided with a vertically penetrating central through hole and the central through hole passes through the center position of the bottom of the oxygen precipitation groove, an air guide central groove 34 is provided at the position outside the central through hole below the rotary valve 25, and the outer groove walls on the opposite sides of the air guide central groove 34 are partially extended outward to form air guide epitaxial grooves 32 respectively, and an annular nitrogen guide peripheral groove 30 is provided at the position outside the two air guide epitaxial grooves 32 below the rotary valve 25, and the inner groove walls on the opposite sides of the nitrogen guide peripheral groove 30 are partially extended inward to form nitrogen guide peripheral grooves 30 respectively. The air guide inner extension groove 48, the two air guide outer extension grooves 32 and the two nitrogen guide inner extension grooves 48 are located on the same virtual ring, and the lower part of the rotary valve 25 is located outside the nitrogen guide outer peripheral groove 30. There are two arc-shaped or strip-shaped and symmetrically arranged oxygen guide grooves 27, and the bottom of the oxygen guide groove 27 is provided with an oxygen flow hole 47 connected to the oxygen sedimentation tank, the air inlet groove 35 is connected to the compressed air inlet port 52, the oxygen outlet groove 36 is connected to the oxygen outlet port 55, the control seat nitrogen exhaust groove 33 is connected to the nitrogen exhaust port 51, the control seat nitrogen exhaust groove 33 is connected to the nitrogen guide outer peripheral groove 30 in vertical correspondence, the air inlet groove 35 is connected to the air guide central groove 34 in vertical correspondence, and the upper ends of the multiple control seat air inlet and exhaust through holes 38 are divided into The control seat 8 is vertically connected to the two air guide outer grooves 32 and the two nitrogen guide inner grooves 48, respectively. The lower ends of the multiple control seat air inlet and exhaust through holes 38 are respectively connected to the upper ends of the multiple upper end cover air inlet and exhaust through holes 10. The upper ends of the multiple control seat oxygen through holes 39 can be vertically connected to the two oxygen guide grooves 27, respectively. The lower ends of the multiple control seat oxygen through holes 39 are respectively connected to the upper ends of the multiple upper end cover oxygen through holes 11. The upper end of the rotary valve 25 is sealed and connected with the rotary valve cover 21. The bottom of the oxygen sedimentation tank and the rotary valve cover 21 form an oxygen inner cavity 23. The lower end of the transmission 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 in sequence and is then placed in the oxygen outlet groove 36 of the control seat 8.The transmission shaft 3 is sealedly connected to the rotary valve cover 21, the rotary valve 25 and the control seat convex ring 40 respectively. A vertical transmission shaft blind hole 19 with an open lower end is provided at one end of the transmission shaft 3 located below the rotary valve cover 21. A radial through hole 20 is provided in the hole wall of the transmission shaft blind hole 19 at a position corresponding to the oxygen inner cavity 23. Note: The above-mentioned air guide central groove 34, air guide outer groove 32, nitrogen guide outer peripheral groove 30, nitrogen guide inner groove 48 and oxygen guide groove 27 are part of the multiple guide grooves under the above-mentioned rotary valve 25, and the rotary valve oxygen sealing groove 29, pressure equalizing groove 28 and oxygen backflush groove 49 in the following content are another part of the multiple guide grooves under the above-mentioned rotary valve 25; the multiple corresponding independent gas channels between the above-mentioned compressed air inlet 52, oxygen outlet 55, nitrogen outlet 51, air inlet groove 35, oxygen outlet groove 36, control seat air inlet and exhaust through hole 38, control seat nitrogen exhaust groove 33 and control seat oxygen through hole 39 are part of the multiple gas channels in the above-mentioned control seat 8, and the independent gas channel between the oxygen sealing inlet 54 and the control seat oxygen sealing groove 31 in the following content is another part of the multiple gas channels in the above-mentioned control seat 8.

[0032] In order to facilitate assembly and realize the function of regulating the oxygen pressure in the oxygen inner cavity 23, a vertical mounting cylinder 18 is provided in the middle of the upper end of the control outer cylinder 6, and the driven wheel 2 is installed on the upper outer wall of the mounting cylinder 18. The middle of the upper end of the rotary valve cover 21 protrudes upward to form a valve cover boss 17. The valve cover boss 17 is provided with a vertical central through hole and the transmission shaft 3 passes through the central through hole and is sealed and connected. The upper part of the valve cover boss 17 is placed in the mounting cylinder 18, and a pressure regulating nut 15 is installed at a position above the valve cover boss 17 in the mounting cylinder 18. The circumferential outer wall of the pressure regulating nut 15 is provided with an external thread and is connected with the valve cover boss 17 through the external thread. The corresponding internal thread connection is arranged on the circumferential inner wall of the mounting cylinder 18, and the upper end face of the pressure regulating nut 15 is provided with a knife groove (not visible in the figure), and a vertically penetrating central through hole is provided at the center position of the bottom of the knife groove, and the transmission shaft 3 passes through the central through hole, and a thrust ball bearing 16 is installed between the lower end of the pressure regulating nut 15 and the upper end of the valve cover boss 17, and the transmission shaft 3 passes through the central 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 can slide vertically, and a compression spring 22 is installed between the lower end of the valve cover boss 17 and the bottom of the oxygen sedimentation tank.

[0033] In order to more reliably realize the function of the transmission shaft driving the rotary valve 25 and the rotary valve cover 21 to rotate synchronously, a plurality of outwardly protruding bumps 26 are provided at positions on the circumferential outer wall of the transmission shaft 3 corresponding to the central through hole of the rotary valve 25, a plurality of downwardly recessed grooves 46 are provided in the middle of the bottom of the oxygen sedimentation tank, and the plurality of bumps 26 are respectively placed in the plurality of said grooves 46, a plurality of outwardly protruding vertical convex strips 45 are provided at positions on the circumferential outer wall of the transmission shaft 3 corresponding to the valve cover boss 17, a plurality of strip grooves (not visible in the figure) are provided on the hole wall through which the center of the valve cover boss 17 passes, and the plurality of strip grooves 45 are respectively placed in the plurality of said strip grooves.

[0034] In order to facilitate better axial positioning of the drive shaft 3 and to facilitate the installation of the compression spring 22, a drive shaft pressure cover 24 is provided above the bottom of the oxygen sedimentation tank, and the drive shaft 3 passes through the central through hole of the drive shaft pressure cover 24. The outer periphery of the drive shaft pressure cover 24 is provided with outwardly protruding lugs (not marked in the figure) on opposite sides, and the circumferential groove wall of the oxygen sedimentation tank is provided with positioning grooves (not marked in the figure) on opposite sides. The two lugs are respectively placed in the two positioning grooves, and the lower end of the compression spring 22 is located in the compression spring positioning groove (not marked in the figure) above the drive shaft pressure cover 24, and the upper end of the compression spring 22 is sleeved on the outside of the raised portion below the valve cover boss 17.

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

[0036] In order to achieve the pressure equalizing function, a plurality of arc-shaped pressure equalizing grooves 28 are provided below the rotary valve 25, at a position outside the rotary valve oxygen sealing groove 29 and inside the two oxygen guide grooves 27. The plurality of pressure equalizing grooves 28 are located on the same virtual ring, and both ends of each pressure equalizing groove 28 extend outwards respectively and are located on the same virtual ring with the two oxygen guide grooves 27.

[0037] In order to realize the oxygen backflush function during nitrogen discharge to improve the nitrogen discharge effect, two arc-shaped or strip-shaped and symmetrically arranged oxygen backflush grooves 49 are provided below the rotary valve 25 and outside the nitrogen guide peripheral groove 30. The bottom of the oxygen backflush groove 49 is provided with an oxygen backflush hole 50 connected to the oxygen sedimentation tank. The two oxygen backflush grooves 49 and the two oxygen guide grooves 27 are located on the same virtual ring.

[0038] In order to achieve a better sealing connection function, a ceramic plate 7 and a sealing gasket (not marked in the figure) are further provided between the control outer tube 6 and the control seat 8. The ceramic plate 7 and the sealing gasket are respectively provided with a plurality of vertical through holes (not marked in the figure) for corresponding communication between the rotary valve 25 and the control seat 8.

[0039] In order to facilitate the transmission connection function between the driven wheel 2 and the transmission shaft 3, a central through hole is provided in the middle of the driven wheel 2 and latch grooves (not marked in the figure) are provided on the opposite sides of the upper part of the hole wall of the central through hole, a radially through latch through hole 44 is provided near the upper end of the transmission shaft 3 and the latch 4 passes through the latch through hole 44, both ends of the latch 4 are placed in the two latch grooves, an external thread is provided on the circumferential outer wall of the transmission shaft 3 at a position above the latch 4, and the nut 5 is sleeved on the outside of the upper end of the transmission shaft 3 and is threadedly connected and presses the latch 4.

[0040] like Figure 1-Figure 7As shown, when in use, the compressed air inlet 52 and the oxygen sealed inlet 54 are respectively 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 exhaust port 51 is connected to the vacuum pump (not shown in the figure). Each molecular sieve inner cavity 41 completes at least two processes of oxygen production and nitrogen exhaust (also called analysis) in sequence, and is divided into more specific pressure equalization process, pressure building adsorption process, air intake and oxygen exhaust process (corresponding to oxygen production process), vacuum desorption process (corresponding to nitrogen exhaust process) and back-blowing desorption process in actual work, wherein the pressure equalization process, pressure building adsorption process and air intake and oxygen exhaust process can be combined into an oxygen production process, and the vacuum desorption process and back-blowing desorption process can be combined into a nitrogen exhaust process. The specific process depends on actual needs. For example, in order to achieve more efficient oxygen production, five molecular sieve inner cavities 41 can be used to complete five processes, or two molecular sieve inner cavities 41 can be used to complete two processes. The present application adopts the former, that is, five molecular sieve inner cavities 41 are used; the conversion between the processes is achieved by driving the driving motor 53 to drive the driving wheel 1, the driven wheel 2, the transmission shaft 3, and the rotary valve 25 to rotate, and the channel switching between the guide groove on the rotary valve 25 and the control seat 8 is used. The following only uses the two main processes of a molecular sieve inner cavity 41, namely the oxygen production process and the nitrogen exhaust process, to illustrate the working principle. The working principles of other molecular sieve inner cavities 41 can refer to the molecular sieve inner cavity 41, and other more specific processes can refer to the relevant content in the utility model patent with patent number "ZL 202221828819.3" and name "Five-cylinder VPSA oxygen production device based on rotary valve control process conversion", which will not be repeated here.

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

[0042] When a molecular sieve inner cavity 41 discharges nitrogen, 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 in the molecular sieve inner cavity 41 are discharged into the air through the upper end cover inlet and outlet holes 10, the control seat inlet and outlet holes 38, the nitrogen guide inner extension groove 48, the nitrogen guide outer peripheral groove 30, the nitrogen discharge port 51, and the vacuum pump in turn, thereby realizing the nitrogen discharge function. In the nitrogen discharge process, the oxygen in the oxygen inner cavity 23 passes through the oxygen backflush hole 50, the oxygen backflush groove 49, the control seat oxygen through hole 39, the upper end cover oxygen through hole 11, the oxygen channel 42, and the lower end cover oxygen through hole 43 in turn, and then enters the molecular sieve and is extracted together with nitrogen, carbon dioxide and other impurities, achieving the purpose of oxygen backflush and achieving a better nitrogen discharge effect.

[0043] When replacing the molecular sieve, it is only necessary to disassemble the control seat 8 and the upper end cover 9 in the control device, or to disassemble the upper end cover 9 and the sieve cylinder assembly 12, and then connect them accordingly after replacing the molecular sieve, thereby achieving the purpose of convenient and efficient molecular sieve replacement, significantly improving efficiency and reducing costs.

[0044] Note: The above-mentioned control device can also be installed on the lower end cover 13, then the upper and lower relationships in the relevant structure are opposite, and this structure is substantially the same as the above-mentioned structure; similarly, if the axial direction of the screen drum assembly is changed to other non-vertical directions, the corresponding structural orientation relationship will also change, which is also substantially the same as the above-mentioned structure.

[0045] The above embodiments are only preferred embodiments of the present invention and are not limitations of the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A single-end integrated small molecular sieve oxygen production assembly that is easy to replace a molecular sieve cartridge, comprising a sieve cartridge assembly, an upper end cover, a lower end cover and a control device, wherein the sieve cartridge assembly is a plurality of vertically penetrating molecular sieve cartridges or an outer cylinder with a plurality of vertically penetrating molecular sieve inner cavities, the upper end cover and the lower end cover are respectively mounted on the upper end and the lower end of the sieve cartridge assembly, the control device comprises a driving motor, a driving wheel, a driven wheel, a transmission shaft and a rotary valve, characterized in that: The control device also includes a control outer cylinder and a control seat, wherein the control seat is mounted on the upper end cover, the control outer cylinder with an opening at the lower end is mounted on the control seat, the drive motor is mounted on the control seat and / or the control outer cylinder, the rotating shaft of the drive motor is connected to the driving wheel, the driving wheel is meshedly connected to the driven wheel, the driven wheel is mounted on the upper end of the control outer cylinder through a rolling bearing, the driven wheel is connected to the upper end of the vertical transmission shaft, the disc-shaped rotary valve is placed in the control outer cylinder and located above the control seat, the lower end of the transmission shaft passes through the corresponding through hole at the upper end of the control outer cylinder from top to bottom and is connected to the rotary valve and cannot rotate relative to the rotary valve, and the outer wall of the control seat is provided with a compressed air An air inlet, an oxygen outlet and a nitrogen exhaust outlet, the upper end cover is provided with a plurality of upper end cover inlet and exhaust through holes and a plurality of upper end cover oxygen through holes, a plurality of guide grooves are provided under the rotary valve, a plurality of gas channels are provided in the control seat, which are respectively connected with the compressed air inlet, the oxygen outlet, the nitrogen exhaust outlet, the plurality of guide grooves, the plurality of upper end cover inlet and exhaust through holes and the plurality of upper end cover oxygen through holes, the lower ends of the plurality of upper end cover inlet and exhaust through holes are respectively connected with the upper ends of the plurality of molecular sieve cylinders or the molecular sieve inner cavities of the sieve cylinder assembly, the lower end cover is provided with a plurality of lower end cover oxygen through holes, and the plurality of lower end cover oxygen through holes are respectively connected with the lower ends of the plurality of upper end cover oxygen through holes through a plurality of oxygen channels provided on the sieve cylinder assembly.

2. The single-end integrated small molecular sieve oxygen production component that is easy to replace the molecular sieve cartridge according to claim 1 is characterized in that: The control seat is provided with a central through hole running vertically, and a control seat convex ring convex toward the center line is provided in the middle section of the hole wall of the central through hole, the control seat convex ring separates the upper and lower parts of the central through hole of the control seat into an air inlet groove and an oxygen outlet groove respectively, and a sealing gland is installed at the lower end of the oxygen outlet groove, a plurality of control seat inlet and exhaust through holes are provided vertically and evenly distributed along the circumference at the position outside the central through hole of the control seat, a circular control seat nitrogen exhaust groove is provided at the position outside the plurality of control seat inlet and exhaust through holes, a plurality of control seat oxygen through holes are provided vertically and evenly distributed along the circumference at the position outside the control seat nitrogen exhaust groove, an oxygen sedimentation groove is provided in the middle of the upper part of the rotary valve, and the rotary valve A vertically penetrating central through hole is provided, and the central through hole passes through the center position of the bottom of the oxygen sedimentation tank. An air guide central groove is provided below the rotary valve at a position outside the central through hole. The outer groove walls on the opposite sides of the air guide central groove are partially extended outward to form air guide epitaxial grooves respectively. An annular nitrogen guide peripheral groove is provided below the rotary valve at a position outside the two air guide epitaxial grooves. The inner groove walls on the opposite sides of the nitrogen guide peripheral groove are partially extended inward to form nitrogen guide inner grooves respectively. The two air guide epitaxial grooves and the two nitrogen guide inner grooves are located on the same virtual ring. Two arc-shaped or strip-shaped oxygen guide grooves are symmetrically arranged below the rotary valve at a position outside the nitrogen guide peripheral grooves. The air guide groove, the bottom of the oxygen guide groove is provided with an oxygen flow hole connected to the oxygen sedimentation groove, the air inlet groove is connected to the compressed air inlet, the oxygen outlet groove is connected to the oxygen outlet, the control seat nitrogen exhaust groove is connected to the nitrogen exhaust port, the control seat nitrogen exhaust groove is vertically correspondingly connected to the nitrogen guide peripheral groove, the air inlet groove is vertically correspondingly connected to the air guide central groove, the upper ends of the plurality of control seat air inlet and exhaust through holes can be respectively connected to the two air guide outer extension grooves and the two nitrogen guide inner extension grooves in vertical correspondence, the lower ends of the plurality of control seat air inlet and exhaust through holes are respectively connected to the upper ends of the plurality of upper end cover air inlet and exhaust through holes, and the upper ends of the plurality of control seat oxygen through holes can be respectively connected to the two The oxygen guide grooves are connected in a vertical direction, and the lower ends of the plurality of oxygen through holes of the control seat are respectively connected in a corresponding manner with the upper ends of the plurality of oxygen through holes of the upper end cover. The upper end of the rotary valve is sealed with a rotary valve cover, and an oxygen inner cavity is formed between the bottom of the oxygen sedimentation tank and the rotary valve cover. The lower end of the transmission shaft passes through the central through hole of the rotary valve cover and the central through hole of the rotary valve from top to bottom in sequence and is then placed in the oxygen outlet groove of the control seat. The transmission shaft is sealedly connected with the rotary valve cover, the rotary valve and the control seat convex ring respectively. A vertical transmission shaft blind hole with an open lower end is provided at one end of the transmission shaft located below the rotary valve cover, and a radial through hole is provided at a position corresponding to the oxygen inner cavity in the hole wall of the transmission shaft blind hole.

3. The single-end integrated small molecular sieve oxygen production component that is easy to replace the molecular sieve cartridge according to claim 2 is characterized in that: A vertical mounting cylinder is provided in the middle of the upper end of the control outer cylinder, the driven wheel is installed on the upper outer wall of the mounting cylinder, the middle of the upper end of the rotary valve cover is raised upward to form a valve cover boss, the valve cover boss is provided with a vertical central through hole and the transmission shaft passes through the central through hole and is sealed and connected, the upper part of the valve cover boss is placed in the mounting cylinder, and a pressure regulating nut is installed in the mounting cylinder at a position above the valve cover boss, the circumferential outer wall of the pressure regulating nut is provided with an external thread and is connected to the circumferential inner wall of the mounting cylinder through the external thread. Corresponding internal thread connection, the upper end face of the pressure-adjusting nut is provided with a knife groove, the center position of the bottom of the knife groove is provided with a vertically penetrating central through hole and the transmission shaft passes through the central through hole, a thrust ball bearing is installed between the lower end of the pressure-adjusting nut and the upper end of the valve cover boss and the transmission 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 and can slide vertically, and a compression spring is installed between the lower end of the valve cover boss and the bottom of the oxygen sedimentation tank.

4. The single-end integrated small molecular sieve oxygen production assembly that is easy to replace the molecular sieve cartridge according to claim 3 is characterized in that: A plurality of outwardly protruding bumps are provided on the circumferential outer wall of the transmission shaft at positions corresponding to the central through hole of the rotary valve, a plurality of downwardly recessed grooves are provided in the middle of the bottom of the oxygen sedimentation tank, and the plurality of bumps are respectively placed in the plurality of grooves, a plurality of outwardly protruding vertical convex strips are provided on the circumferential outer wall of the transmission shaft at positions corresponding to the valve cover boss, a plurality of strip grooves are provided on the hole wall through which the center of the valve cover boss passes, and the plurality of strip grooves are respectively placed in the plurality of strip grooves.

5. The single-end integrated small molecular sieve oxygen production component that is easy to replace the molecular sieve cartridge according to claim 4 is characterized in that: A transmission shaft pressure cover is provided above the bottom of the oxygen sedimentation tank, and the transmission shaft passes through the central through hole of the transmission shaft pressure cover. Outwardly protruding lugs are provided on opposite sides of the outer circumference of the transmission shaft pressure cover, and positioning grooves are provided on opposite sides of the circumferential groove wall of the oxygen sedimentation tank. The two lugs are respectively placed in the two positioning grooves, and the lower end of the compression spring is located in the compression spring positioning groove on the transmission shaft pressure cover.

6. The single-end integrated small molecular sieve oxygen production assembly for easy replacement of molecular sieve cartridges according to any one of claims 2 to 5, characterized in that: An oxygen sealing air inlet is provided on the outer wall of the control seat, and an annular control seat oxygen sealing groove is provided on the control seat at a position outside the control seat nitrogen exhaust groove and inside a plurality of control seat oxygen through holes, and the control seat oxygen sealing groove is communicated with the oxygen sealing air inlet, and an annular rotary valve oxygen sealing groove is provided below the rotary valve at a position outside the nitrogen guide peripheral groove and inside the two oxygen guide grooves, and the control seat oxygen sealing groove and the rotary valve oxygen sealing groove are vertically correspondingly communicated and connected.

7. The single-end integrated small molecular sieve oxygen production assembly that is easy to replace the molecular sieve cartridge according to claim 6, characterized in that: A plurality of arc-shaped pressure equalizing grooves are provided below the rotary valve, at positions outside the oxygen sealing groove of the rotary valve and inside the two oxygen guide grooves. The plurality of pressure equalizing grooves are located on the same virtual ring, and both ends of each of the pressure equalizing grooves extend outwards respectively and are located on the same virtual ring with the two oxygen guide grooves.

8. The single-end integrated small molecular sieve oxygen production assembly for easy replacement of molecular sieve cartridges according to any one of claims 2 to 5, characterized in that: Two arc-shaped or strip-shaped oxygen backflush grooves which are symmetrically arranged are provided below the rotary valve and outside the nitrogen guide peripheral groove. The bottom of the oxygen backflush groove is provided with an oxygen backflush hole which is connected to the oxygen sedimentation groove. The two oxygen backflush grooves and the two oxygen guide grooves are located on the same virtual ring.

9. The single-end integrated small molecular sieve oxygen production assembly for easy replacement of molecular sieve cartridges according to any one of claims 2 to 5, characterized in that: A ceramic plate and a sealing gasket are further 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.

10. The single-end integrated small molecular sieve oxygen production component for easy replacement of molecular sieve cartridges according to any one of claims 1 to 5, characterized in that: A central through hole is provided in the middle of the driven wheel and latch grooves are provided on opposite sides of the upper part of the hole wall of the central through hole, a radially penetrating latch through hole is provided near the upper end of the transmission shaft and the latch passes through the latch through hole, both ends of the latch are placed in the two latch grooves, an external thread is provided on the circumferential outer wall of the transmission shaft at a position above the latch, and a nut is sleeved on the outer side of the upper end of the transmission shaft and is threadedly connected to and tightens the latch.

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