Multi-pass continuous rotary valve and molecular sieve oxygen generation system

Abstract

The application relates to the technical field of gas distribution valves, in particular to a multi-channel continuous rotary valve which is provided with a fixed valve seat, a fixed valve, a movable valve and a servo driving unit, the fixed valve seat is provided with a plurality of adsorption tower gas inlet interfaces and adsorption tower oxygen outlet interfaces; the end surface of the fixed valve facing the movable valve is provided with a plurality of gas inlet hole groups and oxygen outlet hole groups which are distributed along the circumference, and an oxygen exhaust hole; the movable valve is arranged above the fixed valve and is in contact with the end surface of the fixed valve, the end surface of the movable valve facing the fixed valve is provided with a plurality of groove holes which are annularly distributed and functionally independent; through cooperation of the groove holes arranged on the movable valve and the corresponding hole groups on the fixed valve, at least four adsorption towers can be simultaneously operated by only one set of rotary valve structure, the equipment structure is greatly simplified, the number of pipelines and valves is reduced, the installation and maintenance difficulty and cost are reduced, the processes of complete adsorption and desorption are realized, continuous, stable and efficient oxygen production is achieved, and the molecular sieve consumption and cost are reduced.

Description

Technical Field

[0001] This utility model relates to the field of gas distribution valve technology, and in particular to a multi-channel continuous rotary valve and a molecular sieve oxygen generation system. Background Technology

[0002] In industrial applications such as pressure swing adsorption (PSA) oxygen production, the processes of air intake, pressure equalization, gas production, and nitrogen discharge in the adsorption tower need to be controlled by valve switching to achieve a cyclical process. The switching efficiency and stability directly affect the oxygen purity and energy consumption of the system. Currently, most systems use a combination of multiple solenoid valves or pneumatic valves, controlling the opening and closing of the valves in sequence to switch the operating conditions of the adsorption tower. This control method is commonly used in small and medium-sized oxygen production equipment. However, with the increase in equipment throughput and the growing demand for continuity, the traditional valve control mode has gradually revealed some technical limitations.

[0003] In existing technologies, the use of multiple independent valves for switching has the following significant drawbacks: First, the intermittent opening and closing of the valves can lead to time delays in the switching of adsorption tower operating conditions, resulting in insufficient smoothness in the connection between processes, pressure fluctuations, and impact on the stability of system operation and oxygen production efficiency. Second, to achieve the complex operation of multiple adsorption towers, a large number of valves and supporting pipelines are required, which not only makes the overall structure bulky and occupies a lot of space, but also increases the risk of pipeline leakage. At the same time, the increased number of valves significantly increases the difficulty of installation and commissioning and the cost of subsequent maintenance. In addition, traditional valve control is difficult to accurately and synchronously adjust the key parameters such as adsorption time and pressure of each adsorption tower, which can easily lead to incomplete adsorption or insufficient desorption, resulting in low utilization of molecular sieves and further increasing operating costs. Summary of the Invention

[0004] To address the above problems, this utility model provides a multi-channel continuous rotary valve, which includes a fixed valve seat, a fixed valve, a moving valve, and a servo drive unit.

[0005] The fixed valve seat is equipped with multiple adsorption tower inlet ports and adsorption tower outlet ports.

[0006] The fixed valve is fixedly installed on the fixed valve seat, and its end face facing the moving valve is provided with an air inlet group and an oxygen outlet group distributed along the circumference, as well as an oxygen discharge hole.

[0007] The moving valve is positioned above the fixed valve and in contact with the end face of the fixed valve. The end face of the moving valve facing the fixed valve has multiple annularly distributed and functionally independent slots.

[0008] The servo drive unit includes a servo motor, a reducer, and a spindle. The output end of the spindle is connected to the moving valve to drive it to rotate continuously.

[0009] In one embodiment, the plurality of slots on the end face of the moving valve include:

[0010] An air inlet slot is used to periodically connect the air inlet interface of the adsorption tower to achieve air supply.

[0011] Lower pressure equalization slots are used to periodically connect the air inlet of the adsorption tower to achieve lower pressure equalization.

[0012] Oxygen outlet slot is used to collect oxygen produced by the adsorption tower and guide it to the oxygen discharge port.

[0013] Upper pressure equalization slots are used to periodically connect the oxygen outlet port of the adsorption tower to achieve upper pressure equalization.

[0014] Backflush cleaning slots are used to periodically connect the oxygen outlet port of the adsorption tower to achieve backflush cleaning.

[0015] Nitrogen venting slots are used to periodically connect the air inlet of the adsorption tower to achieve nitrogen venting.

[0016] In one embodiment, the upper end face of the moving valve is provided with an air source inlet, which is connected to the air inlet slot, and the side of the moving valve is provided with a nitrogen venting ring groove, which is connected to the nitrogen venting slot.

[0017] In one embodiment, the air inlet group on the fixed valve end face is connected to the air inlet of at least four adsorption towers through the corresponding adsorption tower air inlet interface on the fixed valve seat, and the oxygen outlet group is connected to the oxygen outlet of at least four adsorption towers through the corresponding adsorption tower oxygen outlet interface on the fixed valve seat.

[0018] In one embodiment, the servo drive unit is mounted on a sealing ring via a top cover, the sealing ring is fixed to a fixed valve, the main shaft passes through the sealing ring and is connected to the moving valve, and a first friction plate and a second friction plate are respectively provided on the upper and lower sides of the moving valve.

[0019] In one embodiment, a rotary support assembly is further included, comprising: a positioning shaft fixed to the center of the fixed valve and a deep groove ball bearing mounted on the positioning shaft, wherein the movable valve is supported and positioned by the deep groove ball bearing.

[0020] In one embodiment, the first friction plate is fixed to the fixed valve by a steel sleeve; the second friction plate is fixed to the lower end face of the friction disc; the friction disc is rigidly connected to the sealing ring by fixing screws; the fixed valve is mounted on the fixed valve seat by fixing screws, and the first friction plate is located between the fixed valve and the moving valve.

[0021] In one embodiment, an axial pressing assembly is further included, comprising: a compression spring and a spring seat mounted on the friction disc, the compression spring providing continuous axial pressure to cause the friction disc to drive the second friction plate to axially press the first friction plate.

[0022] This utility model also discloses a molecular sieve oxygen generation system, including at least four adsorption towers and a multi-channel continuous rotary valve as described above. The adsorption tower inlet port of the multi-channel continuous rotary valve is connected to the inlet end of each adsorption tower, and the adsorption tower outlet port is connected to the outlet end of each adsorption tower. The servo motor is connected to a servo driver for speed regulation.

[0023] In one embodiment, the servo driver is configured to adjust the rotational speed of the multi-channel continuous rotary valve to control the adsorption time, adsorption pressure, and nitrogen discharge pressure of each adsorption tower.

[0024] The beneficial effects of this utility model are as follows:

[0025] This utility model discloses a multi-channel continuous rotary valve. By employing a servo drive unit to drive the moving valve to rotate continuously, it replaces the intermittent switching of traditional valves. This allows multiple working processes of each adsorption tower to be seamlessly connected and continuously carried out, significantly improving the overall system's operating efficiency and stability. Through the cooperation of the slots on the moving valve and the corresponding hole groups on the stationary valve, only one rotary valve structure is needed to simultaneously realize multiple operations of at least four adsorption towers. This greatly simplifies the equipment structure, reduces the number of pipelines and valves, and lowers the difficulty and cost of installation and maintenance. Furthermore, the continuous rotation mode reduces mechanical wear and energy loss, extends equipment life, and reduces operating energy consumption. Combined with the servo drive's adjustment of the rotation speed, parameters such as adsorption time and pressure can be reasonably controlled to achieve complete adsorption and desorption processes, resulting in continuous, stable, and efficient oxygen production, while reducing the amount and cost of molecular sieves. Attached Figure Description

[0026] Figure 1 This is an exploded view of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure after the fixed valve seat and the fixed valve are combined.

[0028] Figure 3 This is a top view of the combination of the fixed valve seat and the fixed valve.

[0029] Figure 4 This is a bottom view of the moving valve;

[0030] Figure 5 schematic diagram of the moving valve structure Figure 1 ;

[0031] Figure 6 schematic diagram of the moving valve structure Figure 2 ;

[0032] Figure 7 This is a schematic diagram of the combined states of this application;

[0033] Figure 8 A schematic diagram of the structure after adding pipes;

[0034] Figure 9 This is a cross-sectional view of the present invention.

[0035] Explanation of symbols in the diagram:

[0036] 1. Fixed valve seat; 11. Adsorption tower inlet port; 12. Adsorption tower oxygen outlet port;

[0037] 2. Fixed valve; 21. Air inlet assembly; 22. Oxygen outlet assembly; 23. Oxygen vent;

[0038] 3. Dynamic valve;

[0039] 31. Air inlet slot; 311. Air source inlet; 312. Air inlet pipe;

[0040] 32. Lower equalization tank hole; 33. Oxygen outlet tank hole; 34. Upper equalization tank hole; 35. Backflush cleaning tank hole;

[0041] 36. Nitrogen purging groove; 361. Nitrogen purging ring groove; 362. Nitrogen purging pipe;

[0042] 37. First friction plate; 38. Second friction plate;

[0043] 4. Servo drive unit; 41. Servo motor; 42. Reducer; 43. Spindle; 44. Top cover; 45. Sealing ring;

[0044] 5. Rotary support assembly; 51. Positioning shaft; 52. Deep groove ball bearing;

[0045] 6. Axial clamping assembly; 61. Friction disc; 62. Compression spring; 63. Spring seat. Detailed Implementation

[0046] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0047] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0048] like Figure 1-3 As shown, a multi-channel continuous rotary valve is provided with a fixed valve seat 1, a fixed valve 2, a moving valve 3, and a servo drive unit 4.

[0049] The fixed valve seat 1 is provided with multiple adsorption tower inlet ports 11 and adsorption tower oxygen outlet ports 12.

[0050] The fixed valve 2 is fixedly installed on the fixed valve seat 1. Its end face facing the moving valve 3 is provided with an air inlet group 21 and an oxygen outlet group 22 distributed along the circumference, as well as an oxygen discharge hole 23.

[0051] The moving valve 3 is positioned above the fixed valve 2 and in contact with the end face of the fixed valve 2. The end face of the moving valve 3 facing the fixed valve 2 has multiple annularly distributed and functionally independent slots.

[0052] The servo drive unit 4 includes a servo motor 41, a reducer 42 and a spindle 43. The output end of the spindle 43 is connected to the moving valve 3 to drive it to rotate continuously.

[0053] Specifically, the fixed valve seat 1 serves as the basic component, providing installation support for the entire device. The fixed valve 2 is fixedly mounted on the fixed valve seat 1. Multiple adsorption tower inlet ports 11 and adsorption tower oxygen outlet ports 12 on the fixed valve seat 1 are used to connect to the adsorption towers. The moving valve 3 is positioned above the fixed valve 2 in a face-to-face contact manner, forming a dynamic mating structure. In the servo drive unit 4, the servo motor 41 provides power, which is reduced in speed by the reducer 42 and then transmitted to the moving valve 3 via the main shaft 43. This enables the moving valve 3 to achieve continuous and stable rotational motion around its own axis, thus forming a complete drive and transmission link. The inlet port group 21 and oxygen outlet port group 22 on the end face of the fixed valve 2 are distributed circumferentially, while the multiple slots on the end face of the moving valve 3 are distributed in a ring and each has an independent function. The adsorption tower inlet port 11 can be circular or elliptical, ensuring sufficient air intake while reducing the overall height. When the servo drive unit 4 drives the moving valve 3 to rotate continuously, the slot on the moving valve 3 will periodically connect or disconnect with the air inlet group 21, oxygen outlet group 22 and oxygen exhaust hole 23 on the fixed valve 2 according to the rotation cycle, thereby controlling the gas flow direction and thus coordinating the continuous switching of multiple key processes required by at least four adsorption towers, such as air inlet distribution (providing raw material gas for adsorption towers), pressure equalization (balancing the pressure between different adsorption towers), oxygen collection and output (concentrated delivery of produced oxygen), backflushing and cleaning (cleaning up residual impurities in adsorption towers), and nitrogen removal and desorption (discharging nitrogen to regenerate adsorbent). In this application, by using a servo drive unit 4 to drive the moving valve 3 to rotate continuously, the intermittent switching of the traditional valve is replaced. This allows multiple working processes of each adsorption tower to be seamlessly connected and continuously carried out, greatly improving the overall system's operating efficiency and stability. Through the cooperation between the slots on the moving valve 3 and the corresponding hole groups on the fixed valve 2, only one set of rotary valve structure is needed to realize multiple operations of at least four adsorption towers simultaneously. This greatly simplifies the equipment structure, reduces the number of pipelines and valves, and lowers the difficulty and cost of installation and maintenance. Moreover, the continuous rotation mode reduces mechanical wear and energy loss, extends equipment life, and reduces operating energy consumption. Combined with the servo drive's adjustment of the rotation speed, parameters such as adsorption time and pressure can be reasonably controlled to achieve complete adsorption and desorption processes, achieving continuous, stable, and efficient oxygen production, and reducing the amount and cost of molecular sieves.

[0054] like Figure 4 , 5 As shown, the plurality of slots on the end face of the moving valve 3 include:

[0055] Inlet slot 31 is used for supplying gas to the inlet interface of the periodic adsorption tower.

[0056] Lower pressure equalization slot 32 is used to achieve lower pressure equalization at the air inlet of the periodic interconnected adsorption tower.

[0057] Oxygen outlet slot 33 is used to collect oxygen produced by the adsorption tower and guide it to the oxygen outlet 23.

[0058] Upper pressure equalization slot 34 is used to achieve upper pressure equalization at the oxygen outlet of the periodic interconnection adsorption tower.

[0059] Backflush cleaning slot 35 is used for backflush cleaning of the oxygen outlet interface of the periodic adsorption tower.

[0060] Nitrogen venting slot 36 is used for nitrogen venting at the air inlet of the periodic adsorption tower.

[0061] Specifically, the air inlet slot 31, lower pressure equalization slot 32, and nitrogen discharge slot 36 on the end face of the moving valve 3 periodically connect with the air inlet group 21 on the fixed valve 2 during rotation, distributing air to the adsorption tower through the adsorption tower air inlet interface 11 of the fixed valve seat 1 to achieve pressure equalization or nitrogen discharge; the oxygen outlet slot 33 continuously collects the oxygen generated by the adsorption tower and guides it to the oxygen discharge port 23 of the fixed valve 2; the upper pressure equalization slot 34 and the backflush cleaning slot 35 are connected to the oxygen outlet end of the adsorption tower through the adsorption tower oxygen outlet interface 12 on the fixed valve seat 1, respectively realizing the functions of upper pressure equalization and backflush cleaning. Every time the moving valve 3 rotates once, each slot sequentially completes one on / off cycle with the corresponding hole group of the fixed valve 2, so that at least four adsorption towers simultaneously complete the processes of air intake adsorption, pressure equalization, nitrogen discharge desorption, and backflush cleaning, forming a continuous oxygen production cycle. The inlet slot 31, lower pressure equalization slot 32, nitrogen venting slot 36, oxygen outlet slot 33, upper pressure equalization slot 34, and backflushing cleaning slot 35 each correspond to the core processes of the adsorption tower operation, such as inlet, lower pressure equalization, nitrogen venting, oxygen outlet, upper pressure equalization, and backflushing cleaning. This ensures that the processes of inlet distribution, pressure equalization, oxygen collection, impurity removal, and nitrogen venting regeneration in the adsorption tower are switched in an orderly manner during the continuous rotation of the moving valve 3. This allows the complex operating process of at least four adsorption towers to form a closed loop, ensuring seamless connection between each stage. The periodic connection or disconnection design of each slot, combined with the continuous rotation of the moving valve 3, enables rapid response to the operating conditions of the adsorption tower. The upper pressure equalization slot 34 and lower pressure equalization slot 32 equalize pressure from the oxygen outlet and inlet ends of the adsorption tower, respectively, reducing the impact of pressure fluctuations on adsorbent performance and lowering energy consumption. The backflushing cleaning slot 35 periodically removes impurities, maintaining the adsorption efficiency of the adsorption tower. The nitrogen venting slot 36 discharges nitrogen, accelerating adsorbent regeneration and improving the continuity and stability of oxygen production. The multiple slots on the end face of the actuator valve 3 adopt a function-oriented design. Their specific shapes (including but not limited to the arc length, width, depth, transition curvature and edge chamfer of the slots) can be adaptively adjusted according to the actual working conditions. For example, the cross-sectional area of ​​the slots can be increased or decreased to match different adsorption tower volumes, and the flow channel profile can be adjusted to optimize high and low pressure differential conditions. Such geometric variations are all conventional design choices made by those skilled in the art based on the same functional logic (i.e., the periodic on / off control of the slots and the fixed valve orifice group), and should be covered within the scope of protection of this patent.

[0062] like Figure 6 , 7As shown in Figures 8 and 9, the upper end face of the moving valve 3 is provided with an air source inlet 311, which is connected to the air inlet slot 31. The side of the moving valve 3 is provided with a nitrogen discharge ring groove 361, which is connected to the nitrogen discharge slot 361.

[0063] Specifically, the gas source inlet 311 is connected to the gas source via the inlet pipe 312, and the nitrogen venting ring groove 361 is connected to the vacuum equipment via the nitrogen venting pipe 362 to vent nitrogen. The nitrogen venting ring groove 361 on the side of the moving valve 3 is sealed on both the upper and lower sides to prevent nitrogen leakage. When the equipment is running, external compressed air is used as the air source, entering through the inlet pipe 312 and flowing through the gas source inlet 311 on the upper end face of the moving valve 3 into the inlet slot 31. During the rotation of the moving valve 3, the inlet slot 31 periodically connects with the inlet hole group 21 on the fixed valve 2, and the air enters the adsorption tower through the adsorption tower inlet port 11 of the fixed valve seat 1. The air completes nitrogen adsorption in the adsorption tower, and the produced oxygen is collected at the oxygen outlet end of the adsorption tower, continuously collected by the oxygen outlet slot 33 of the moving valve, and guided to the oxygen vent 23 of the fixed valve 2, and finally transported to the outside through the oxygen outlet pipe. Once an adsorption tower has produced over 90% of its oxygen, it enters the pressure equalization stage. The purpose of this stage is to utilize impure oxygen to reduce energy consumption and improve extraction efficiency. Lower pressure equalization, or pressure equalization at the inlet end, occurs when the lower pressure equalization slot 32 of the dynamic valve 3 periodically connects to the inlet port group 21 of the fixed valve 2. Through the adsorption tower inlet port 11, the remaining impure oxygen in the current adsorption tower is pressure equalized to the inlet end of another adsorption tower that is under negative pressure. Upper pressure equalization, i.e., pressure equalization at the oxygen outlet, is achieved by connecting the upper pressure equalization slot 34 of the moving valve 3 to the oxygen outlet of the adsorption tower via the oxygen outlet port 12 of the fixed valve seat 1, thereby balancing the pressure at the current oxygen outlet of the adsorption tower to the oxygen outlet of the other adsorption tower. When the moving valve 3 rotates to the nitrogen removal stage, the nitrogen removal slot 36 periodically connects to the air inlet group 21 of the fixed valve 2, allowing the nitrogen adsorbed by the molecular sieve in the adsorption tower to be discharged through the air inlet port 11 of the adsorption tower. During the nitrogen removal process, the nitrogen is discharged only through the nitrogen removal slot 36, the nitrogen removal ring groove 361, and the nitrogen removal pipe 362 to avoid leakage. Simply evacuating cannot completely remove the residual nitrogen in the molecular sieve. The backflushing cleaning slot 35 of the moving valve 3 connects to the oxygen outlet of the adsorption tower via the oxygen outlet port 12 of the fixed valve seat 1, allowing the high-concentration oxygen collected in the oxygen outlet slot 33 to be sent back into the adsorption tower to backflush the molecular sieve and remove residual impurities. Each rotation of the moving valve 3 completes one on / off cycle with the corresponding hole group of the fixed valve 2, forming a continuous oxygen production cycle, ensuring seamless connection of each link and stable oxygen production.

[0064] like Figure 2 , 3As shown, the air inlet group 21 on the end face of the fixed valve 2 is connected to the air inlet end of at least four adsorption towers through the corresponding adsorption tower air inlet interface 11 on the fixed valve seat 1, and the oxygen outlet group 22 is connected to the oxygen outlet end of at least four adsorption towers through the corresponding adsorption tower oxygen outlet interface 12 on the fixed valve seat 1.

[0065] Specifically, the air inlet group 21 on the end face of the fixed valve 2 is connected to the air inlet of at least four adsorption towers through the adsorption tower air inlet interface 11 of the fixed valve seat 1, and the oxygen outlet group 22 is connected to the oxygen outlet of the corresponding adsorption tower through the adsorption tower oxygen outlet interface 12 of the fixed valve seat 1. This achieves precise correspondence and centralized control of the gas path, ensuring stable entry of raw material gas into each adsorption tower and efficient oxygen export, while also making the gas path connection of multiple adsorption towers more orderly, simplifying the overall pipeline layout, facilitating the coordinated switching of various processes in conjunction with the slot of the moving valve 3, and improving the coordination and reliability of system operation.

[0066] like Figure 1 As shown, the servo drive unit 4 is mounted on the sealing ring 45 via the upper cover 44. The sealing ring 45 is fixed to the fixed valve 2. The main shaft 43 passes through the sealing ring 45 and is connected to the moving valve 3. The moving valve 3 is provided with a first friction plate 37 and a second friction plate 38 on its upper and lower sides, respectively.

[0067] Specifically, the servo drive unit 4 is mounted on the sealing ring 45 via the upper cover 44. The sealing ring 45 is fixed to the stationary valve 2. The main shaft 43 passes through the sealing ring 45 and connects to the moving valve 3, which is equipped with a sealing ring. The moving valve 3 has a first friction plate 37 and a second friction plate 38 on its upper and lower sides. The sealing ring 45 and the sealing ring enhance the overall sealing performance and prevent gas leakage. The friction plates reduce the wear on the end face of the moving valve 3 during rotation. At the same time, the fixing structure of the upper cover 44 and the sealing ring 45 ensures the installation stability between the servo drive unit 4 and the moving valve 3 and the stationary valve 2, ensuring precise and efficient drive transmission and improving the reliability and service life of the equipment.

[0068] like Figure 1 As shown, it also includes a rotary support assembly 5, comprising: a positioning shaft 51 fixed to the center of the fixed valve 2, and a deep groove ball bearing 52 mounted on the positioning shaft 51, wherein the moving valve 3 is supported and positioned by the deep groove ball bearing 52.

[0069] Specifically, in the rotating support assembly 5, the positioning shaft 51 fixed to the center of the stationary valve 2, together with the deep groove ball bearing 52, supports and positions the moving valve 3, providing stable structural support for the continuous rotation of the moving valve 3, reducing radial sway during rotation, ensuring the tightness and fitting accuracy of the contact between the moving valve 3 and the end face of the stationary valve 2, reducing the frictional resistance of the moving valve 3 during rotation, improving the smoothness and stability of rotation, and thus ensuring the accuracy of the switching of each slot and corresponding hole group, enhancing the overall reliability of the equipment operation.

[0070] like Figure 1 As shown, the first friction plate 37 is fixed to the fixed valve 2 by a steel sleeve; the second friction plate 38 is fixed to the lower end face of the friction disc 61; the friction disc 61 is rigidly connected to the sealing ring 45 by fixing screws; the fixed valve 2 is installed on the fixed valve seat 1 by fixing screws, and the first friction plate 37 is located between the fixed valve 2 and the moving valve 3.

[0071] Specifically, the first friction plate 37 is fixed to the stationary valve 2 by a steel sleeve and is located between the stationary valve 2 and the moving valve 3. The second friction plate 38 is fixed to the lower end face of the friction disc 61, which is rigidly connected to the sealing ring 45. The stationary valve 2 is installed on the stationary valve seat 1 by fixing screws. This reduces the direct wear when the moving valve 3 and the stationary valve 2 rotate relative to each other, extends the service life of the components, and ensures the stability of the position of each component through rigid connection and fixed installation. This ensures the accuracy of the cooperation between the moving valve 3 and the stationary valve 2 and improves the overall reliability of operation.

[0072] like Figure 1 As shown, it also includes an axial pressing assembly 6, which includes a compression spring 62 and a spring seat 63 mounted on the friction disc 61. The compression spring 62 provides continuous axial pressure, causing the friction disc 61 to drive the second friction plate 38 to axially press the first friction plate 37.

[0073] Specifically, the compression spring 62 and spring seat 63 of the axial pressing assembly 6 are mounted on the friction disc 61. The continuous axial pressure provided by the compression spring 62 causes the friction disc 61 to drive the second friction plate 38 to press the first friction plate 37, ensuring that the moving valve 3 and the fixed valve 2 always maintain close contact, effectively preventing gas leakage, ensuring the sealing and accuracy of the on / off cooperation between each slot and the corresponding hole group, and compensating for the gap caused by component wear, maintaining stable contact pressure, and improving the reliability of long-term operation of the equipment.

[0074] A molecular sieve oxygen generation system includes at least four adsorption towers and a multi-channel continuous rotary valve. The adsorption tower inlet 11 of the multi-channel continuous rotary valve is connected to the inlet end of each adsorption tower, and the adsorption tower outlet 12 is connected to the outlet end of each adsorption tower. The servo motor 41 is connected to a servo driver for speed regulation.

[0075] Specifically, the inlet port 11 and outlet port 12 of the adsorption tower are connected to the inlet and outlet ports of each adsorption tower respectively through the multi-channel continuous rotary valve. The servo motor 41 is connected to the servo driver for speed regulation. The multi-channel continuous rotary valve realizes the continuous switching of processes such as air distribution, pressure equalization, and oxygen collection and discharge of each adsorption tower. With the precise control of speed by the servo driver, it can flexibly adapt to different working conditions. It not only ensures the continuity and efficiency of the oxygen production process, but also improves the stability and adaptability of the system operation. At the same time, the integrated design simplifies the overall structure and reduces maintenance costs.

[0076] like Figure 1 As shown, the servo driver is configured to adjust the rotation speed of the multi-channel continuous rotary valve to control the adsorption time, adsorption pressure and nitrogen discharge pressure of each adsorption tower.

[0077] Specifically, the servo drive precisely controls the adsorption time, adsorption pressure, and nitrogen discharge pressure of each adsorption tower by adjusting the rotation speed of the multi-channel continuous rotary valve. It can flexibly adjust process parameters according to actual oxygen production needs, optimize the adsorption and regeneration efficiency of the adsorbent, further improve oxygen purity and yield, and at the same time ensure that the system can maintain the best operating state under different working conditions, thus enhancing the overall controllability and adaptability.

[0078] This utility model discloses a multi-channel continuous rotary valve. The inlet hole group 21 and the oxygen outlet hole group 22 on the end face of the fixed valve 2 are distributed circumferentially, while the multiple slots on the end face of the moving valve 3 are distributed in a ring and each has an independent function. When the servo drive unit 4 drives the moving valve 3 to rotate continuously, the slots on the moving valve 3 will periodically connect or disconnect with the inlet hole group 21, the oxygen outlet hole group 22, and the oxygen exhaust hole 23 on the fixed valve 2 according to the rotation cycle. This precisely controls the gas flow direction and thus coordinates the continuous switching of multiple key processes required by at least four adsorption towers, such as gas distribution (providing raw gas to the adsorption towers), pressure equalization (balancing the pressure between different adsorption towers), oxygen collection and discharge (concentrated delivery of produced oxygen), backflushing and cleaning (cleaning up residual impurities in the adsorption towers), and nitrogen removal and desorption (discharging nitrogen to regenerate the adsorbent). In this application, by using a servo drive unit 4 to drive the moving valve 3 to rotate continuously, the intermittent switching of the traditional valve is replaced. This allows multiple working processes of each adsorption tower to be seamlessly connected and continuously carried out, greatly improving the overall system's operating efficiency and stability. Through the cooperation between the slots on the moving valve 3 and the corresponding hole groups on the fixed valve 2, only one set of rotary valve structure is needed to realize multiple operations of at least four adsorption towers simultaneously. This greatly simplifies the equipment structure, reduces the number of pipelines and valves, and lowers the difficulty and cost of installation and maintenance. Moreover, the continuous rotation mode reduces mechanical wear and energy loss, extends equipment life, and reduces operating energy consumption. Combined with the servo drive's adjustment of the rotation speed, parameters such as adsorption time and pressure can be reasonably controlled to achieve complete adsorption and desorption processes, achieving continuous, stable, and efficient oxygen production, and reducing the amount and cost of molecular sieves.

[0079] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

[0080] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

Claims

1. A multi-channel continuous rotary valve, comprising a fixed valve seat (1), a fixed valve (2), a moving valve (3), and a servo drive unit (4), characterized in that: The fixed valve seat (1) is provided with multiple adsorption tower inlet ports (11) and adsorption tower oxygen outlet ports (12). The fixed valve (2) is fixedly installed on the fixed valve seat (1), and its end face facing the moving valve (3) is provided with an air inlet group (21) and an oxygen outlet group (22) distributed along the circumference, as well as an oxygen discharge hole (23). The moving valve (3) is positioned above the fixed valve (2) and in contact with the end face of the fixed valve (2). The end face of the moving valve (3) facing the fixed valve (2) is provided with multiple annularly distributed and functionally independent slots. The servo drive unit (4) includes a servo motor (41), a reducer (42) and a spindle (43). The output end of the spindle (43) is connected to the moving valve (3) to drive it to rotate continuously.

2. The multi-channel continuous rotary valve according to claim 1, characterized in that, The plurality of slots on the end face of the moving valve (3) include: An air inlet slot (31) is used to periodically connect the air inlet port (11) of the adsorption tower to achieve air supply. Lower pressure equalization slot (32) is used to periodically connect the air inlet (11) of the adsorption tower to achieve lower pressure equalization. Oxygen outlet slot (33) used to collect oxygen produced by the adsorption tower and guide it to the oxygen outlet hole (23). Upper pressure equalization slot (34) is used to periodically connect the oxygen outlet port (12) of the adsorption tower to achieve upper pressure equalization. Backflush cleaning slots (35) are used to periodically connect the oxygen outlet port (12) of the adsorption tower to achieve backflush cleaning. Nitrogen venting slots (36) are used to periodically connect the adsorption tower inlet (11) to achieve nitrogen venting.

3. A multi-channel continuous rotary valve according to claim 2, characterized in that, The upper end face of the moving valve (3) is provided with an air source inlet (311), the air source inlet (311) is connected to the air inlet slot (31), and the side of the moving valve (3) is provided with a nitrogen discharge ring groove (361), the nitrogen discharge slot (36) is connected to the nitrogen discharge ring groove (361).

4. A multi-pass continuous rotary valve according to claim 2, characterized in that, The air inlet group (21) on the end face of the fixed valve (2) is connected to the air inlet of at least four adsorption towers through the corresponding adsorption tower air inlet interface (11) on the fixed valve seat (1), and the oxygen outlet group (22) is connected to the oxygen outlet of at least four adsorption towers through the corresponding adsorption tower oxygen outlet interface (12) on the fixed valve seat (1).

5. A multi-pass continuous rotary valve according to claim 1, characterized in that, The servo drive unit (4) is mounted on the sealing ring (45) through the upper cover (44). The sealing ring (45) is fixed on the fixed valve (2). The main shaft (43) passes through the sealing ring (45) and connects to the moving valve (3). The moving valve (3) has a first friction plate (37) and a second friction plate (38) on its upper and lower sides respectively.

6. A multi-pass continuous rotary valve according to claim 1, characterized in that, It also includes a rotary support assembly (5), comprising: a positioning shaft (51) fixed to the center of the fixed valve (2) and a deep groove ball bearing (52) mounted on the positioning shaft (51), wherein the moving valve (3) is supported and positioned by the deep groove ball bearing (52).

7. A multi-pass continuous rotary valve according to claim 5, characterized in that, The first friction plate (37) is fixed to the fixed valve (2) by a steel sleeve; the second friction plate (38) is fixed to the lower end face of the friction disc (61); the friction disc (61) is rigidly connected to the sealing ring (45) by a fixing screw; the fixed valve (2) is installed on the fixed valve seat (1) by a fixing screw, and the first friction plate (37) is located between the fixed valve (2) and the moving valve (3).

8. A multi-pass continuous rotary valve according to claim 7, characterized in that, It also includes an axial pressing assembly (6), comprising a compression spring (62) and a spring seat (63) mounted on the friction disc (61), the compression spring (62) providing continuous axial pressure so that the friction disc (61) drives the second friction plate (38) to axially press the first friction plate (37).

9. A molecular sieve oxygen generation system, characterized in that, It includes at least four adsorption towers and a multi-channel continuous rotary valve as described in any one of claims 1 to 7, wherein the adsorption tower inlet port (11) of the multi-channel continuous rotary valve is connected to the inlet end of each adsorption tower, the adsorption tower outlet port (12) is connected to the outlet end of each adsorption tower, and the servo motor (41) is connected to a servo driver for speed regulation.

10. A molecular sieve oxygen generation system according to claim 9, characterized in that, The servo driver is configured to adjust the rotation speed of the multi-channel continuous rotary valve to control the adsorption time, adsorption pressure, and nitrogen discharge pressure of each adsorption tower.

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