Multi-channel continuous rotary valve

Abstract

The invention 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, and the fixed valve seat is provided with a plurality of adsorption tower gas inlet connectors and adsorption tower oxygen outlet connectors; the end face, facing the movable valve, of the fixed valve is provided with an air inlet hole set, an oxygen outlet hole set and an oxygen exhaust hole, wherein the air inlet hole set and the oxygen outlet hole set are distributed along the circumference. The movable valve is arranged above the fixed valve and makes contact with the end face of the fixed valve. The end face, facing the fixed valve, of the movable valve is provided with a plurality of groove holes which are annularly distributed and independent in function. Through the cooperation of the slotted holes in the movable valve and the corresponding hole groups in the fixed valve, various operations of at least four adsorption towers can be simultaneously realized by only one set of rotary valve structure, so that the equipment structure is greatly simplified, the number of pipelines and valves is reduced, the difficulty and cost of installation and maintenance are reduced, the processes of complete adsorption, desorption and the like are realized, and continuous, stable and efficient oxygen production is realized; the molecular sieve dosage and cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of gas distribution valves, in particular to a multi-channel continuous rotary valve. Background Art In industrial fields such as pressure swing adsorption oxygen production, the adsorption tower's air intake, pressure equalization, gas production, and nitrogen exhaust processes require periodic cycles through valve switching control. The efficiency and stability of these switching cycles directly impact the system's oxygen purity and energy consumption. Currently, most systems use a combination of multiple solenoid valves or pneumatic valves to switch the adsorption tower's operating conditions through timed valve on-off control. This control method is commonly used in small and medium-sized oxygen production equipment. However, with the increase in equipment processing capacity and the increasing demand for continuity, traditional valve control modes have gradually exposed some technical limitations.

[0002] In the existing technology, when multiple independent valves are used for switching, there are the following obvious deficiencies: First, the intermittent switching action of the valves can easily lead to time delays in switching the working conditions of the adsorption towers, and the connection between the various processes is not smooth enough, which can easily cause pressure fluctuations and affect the stability of the system operation and the oxygen production efficiency; second, in order to realize the complex operation of multiple adsorption towers, a large number of valves and supporting pipelines are required, which not only makes the overall structure bloated and occupies a large space, but also increases the risk of pipeline leakage. At the same time, the increase in the number of valves will significantly increase the difficulty of installation and debugging and the subsequent maintenance costs; in addition, traditional valve control is difficult to accurately and synchronously adjust the key parameters such as the adsorption time and pressure of each adsorption tower, and is prone to problems such as incomplete adsorption or insufficient desorption, resulting in low utilization of the molecular sieve and further increased operating costs. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a multi-channel continuous rotary valve, which is provided with a fixed valve seat, a fixed valve, a movable valve, and a servo drive unit. The movable valve is connected to the fixed valve through a rotating support assembly. The fixed valve seat is provided with a plurality of adsorption tower air inlet interfaces and adsorption tower oxygen outlet interfaces; The fixed valve is fixedly mounted on the fixed valve seat, and its end surface facing the movable valve is provided with an air inlet hole group and an oxygen outlet hole group distributed along the circumference, as well as an oxygen exhaust hole; The movable valve is arranged above the fixed valve and contacts the end surface of the fixed valve. The end surface of the movable valve facing the fixed valve is provided with a plurality of slots distributed in an annular manner and having independent functions. The servo drive unit includes a servo motor, a reducer and a main shaft. The main shaft output end is connected to the movable valve to drive it to rotate continuously. The servo drive unit is installed on the sealing ring through the upper cover, and the sealing ring is fixed on the fixed valve.

[0004] In one embodiment, the plurality of slots on the end surface of the movable valve include: An air inlet slot for periodically connecting to the air inlet interface of the adsorption tower to realize air supply; A lower pressure equalizing slot hole for periodically connecting the air inlet interface of the adsorption tower to achieve lower pressure equalization; Oxygen outlet slot for collecting oxygen produced in the adsorption tower and directing it to the oxygen outlet hole; An upper pressure equalizing slot hole for periodically connecting the oxygen outlet interface of the adsorption tower to achieve upper pressure equalization; A backflushing cleaning slot for periodically connecting to the oxygen outlet interface of the adsorption tower to realize backflushing cleaning; The nitrogen exhaust slot is used to periodically connect the air inlet interface of the adsorption tower to achieve nitrogen exhaust.

[0005] In one embodiment, the upper end surface of the movable valve is provided with an air source inlet, which is communicated with the air inlet slot; the side surface of the movable valve is provided with a nitrogen exhaust ring groove, which is communicated with the nitrogen exhaust slot.

[0006] In one embodiment, the air inlet hole group on the fixed valve end face is connected to the air inlet ends of at least four adsorption towers through the corresponding adsorption tower air inlet interfaces on the fixed valve seat, and the oxygen outlet hole group is connected to the oxygen outlet ends of at least four adsorption towers through the corresponding adsorption tower oxygen outlet interfaces on the fixed valve seat.

[0007] In one embodiment, the servo drive unit is installed on the sealing ring through the upper cover, the sealing ring is fixed on the fixed valve, the main shaft passes through the sealing ring through the sealing ring to connect to the movable valve, and the first friction plate and the second friction plate are respectively provided on the upper and lower sides of the movable valve.

[0008] In one embodiment, the rotary support assembly includes: a positioning shaft fixed to the center of the fixed valve, and a deep groove ball bearing installed on the positioning shaft, and the movable valve is supported and positioned by the deep groove ball bearing.

[0009] In one embodiment, the first friction plate is fixed to the fixed valve by gluing a steel sleeve; the second friction plate is fixed to the lower end surface of the friction disc; the friction disc is rigidly connected to the sealing ring by fixing screws; the fixed valve is installed on the fixed valve seat by fixing screws, and the first friction plate is located between the fixed valve and the movable valve.

[0010] In one embodiment, an axial pressing assembly is further included, including a compression spring and a spring seat installed on the friction disc, wherein the compression spring provides continuous axial pressure so that the friction disc drives the second friction plate to axially press the first friction plate.

[0011] The present invention also discloses a molecular sieve oxygen production system, comprising at least four adsorption towers and the multi-channel continuous rotary valve as described above, wherein the adsorption tower air inlet interface of the multi-channel continuous rotary valve is respectively connected to the air inlet end of each adsorption tower, the adsorption tower oxygen outlet interface is respectively connected to the oxygen outlet end of each adsorption tower, and the servo motor is connected to a servo driver for speed adjustment.

[0012] In one embodiment, 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 exhaust pressure of each adsorption tower.

[0013] The beneficial effects of the present invention are: The present invention provides a multi-channel continuous rotary valve, which replaces the intermittent switching of traditional valves by adopting a servo drive unit to drive the continuous rotation of the movable valve, so that the multiple working processes of each adsorption tower can be seamlessly connected and continuously carried out, greatly improving the operating efficiency and stability of the overall system; through the cooperation of the slots set on the movable valve and the corresponding hole groups on the fixed valve, only one set of rotary valve structure is needed to simultaneously realize multiple operations of at least four adsorption towers, greatly simplifying the equipment structure, reducing the number of pipelines and valves, and reducing the difficulty and cost of installation and maintenance; the continuous rotation mode reduces mechanical wear and energy loss, extends the life of the equipment, and reduces operating energy consumption; combined with the adjustment of the speed by the servo driver, it can reasonably control parameters such as adsorption time and pressure, realize complete adsorption, desorption and other processes, achieve continuous, stable and efficient oxygen production, and reduce the amount and cost of molecular sieves. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an exploded view of the present invention; Figure 2 It is a structural diagram of the combination of the fixed valve seat and the fixed valve; Figure 3 This is a top view of the fixed valve seat and fixed valve after assembly; Figure 4 This is a bottom view of the moving valve; Figure 5 Schematic diagram of the movable valve structure Figure 1 ; Figure 6 Schematic diagram of the movable valve structure Figure 2 ; Figure 7 This is a schematic diagram of the combined state of the present invention; Figure 8 To add a schematic diagram of the structure after the pipeline; Figure 9 It is a cross-sectional view of the present invention.

[0015] Explanation of symbols in the figure: 1. Fixed valve seat; 11. Adsorption tower air inlet interface; 12. Adsorption tower oxygen outlet interface; 2. Fixed valve; 21. Air inlet group; 22. Oxygen outlet group; 23. Oxygen exhaust hole; 3. Moving valve; 31. Air inlet slot; 311. Air source inlet; 312. Air inlet pipe; 32. Lower pressure equalizing slot; 33. Oxygen outlet slot; 34. Upper pressure equalizing slot; 35. Backflush cleaning slot; 36, nitrogen exhaust slot; 361, nitrogen exhaust ring groove; 362, nitrogen exhaust pipe; 37. First friction plate; 38. Second friction plate; 4. Servo drive unit; 41. Servo motor; 42. Reducer; 43. Spindle; 44. Upper cover; 45. Sealing ring; 5. Rotating support assembly; 51. Positioning shaft; 52. Deep groove ball bearing; 6. Axial compression assembly; 61. Friction disc; 62. Compression spring; 63. Spring seat. DETAILED DESCRIPTION

[0016] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0017] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0018] 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 movable valve 3, and a servo drive unit 4. The movable valve 3 is connected to the fixed valve 2 through a rotating support assembly 5. The fixed valve seat 1 is provided with a plurality of adsorption tower air inlet interfaces 11 and adsorption tower oxygen outlet interfaces 12; The fixed valve 2 is fixedly mounted on the fixed valve seat 1, and its end surface facing the movable valve 3 is provided with an air inlet hole group 21 and an oxygen outlet hole group 22, as well as an oxygen exhaust hole 23, which are distributed along the circumference. The movable valve 3 is arranged above the fixed valve 2 and contacts the end surface of the fixed valve 2. The end surface of the movable valve 3 facing the fixed valve 2 is provided with a plurality of slots distributed in an annular manner and having independent functions. The servo drive unit 4 includes a servo motor 41, a reducer 42 and a main shaft 43. The output end of the main shaft 43 is connected to the movable valve 3 to drive it to rotate continuously. The servo drive unit 4 is installed on the sealing ring 45 through the upper cover 44, and the sealing ring 45 is fixed on the fixed valve 2.

[0019] Specifically, the fixed valve seat 1 serves as a basic component, providing mounting support for the entire device. The fixed valve 2 is fixedly mounted on the fixed valve seat 1. The multiple adsorption tower air inlet interfaces 11 and the adsorption tower oxygen outlet interfaces 12 on the fixed valve seat 1 are used to connect the adsorption tower. The dynamic valve 3 is placed above the fixed valve 2 in the form of end-face contact, forming a dynamic matching structure. In the servo drive unit 4, the servo motor 41 provides power, which is decelerated by the reducer 42 and then transmitted to the dynamic valve 3 through the main shaft 43, so that the dynamic valve 3 can achieve continuous and stable rotational motion around its own axis, thereby forming a complete drive and transmission chain. The air inlet hole group 21 and the oxygen outlet hole group 22 on the end face of the fixed valve 2 are distributed along the circumference, while the multiple slots on the end face of the dynamic valve 3 are distributed in an annular shape and each has independent function. The adsorption tower air inlet interface 11 can be circular or elliptical, which can reduce the overall height while ensuring the air intake. When the servo drive unit 4 drives the movable valve 3 to rotate continuously, the slots on the movable valve 3 will form a periodic connection or disconnection state with the air inlet hole group 21, the oxygen outlet hole group 22, and the oxygen exhaust hole 23 on the fixed valve 2 in turn according to the rotation cycle, thereby controlling the gas flow direction, and then collaboratively completing the continuous switching of multiple key processes required by at least four adsorption towers, including air intake distribution (providing raw gas for the adsorption tower), pressure equalization (balancing the pressure between different adsorption towers), oxygen collection and derivation (centrally transporting the produced oxygen), backflush cleaning (cleaning residual impurities in the adsorption tower), and nitrogen desorption (exhausting nitrogen to achieve adsorbent regeneration). In the present application, the servo drive unit 4 is used to drive the dynamic valve 3 to rotate continuously, thereby replacing the intermittent switching of the traditional valve, so that the multiple working processes of each adsorption tower can be seamlessly connected and carried out continuously, greatly improving the operating efficiency and stability of the overall system; through the cooperation of the slots set on the dynamic valve 3 and the corresponding hole groups on the fixed valve 2, only one set of rotary valve structure is needed to simultaneously realize multiple operations of at least four adsorption towers, which greatly simplifies the equipment structure, reduces the number of pipelines and valves, and reduces the difficulty and cost of installation and maintenance. The continuous rotation mode reduces mechanical wear and energy loss, extends the life of the equipment, and reduces operating energy consumption. Combined with the adjustment of the speed by the servo drive, the adsorption time, pressure and other parameters can be reasonably controlled to realize complete adsorption, desorption and other processes, achieve continuous, stable and efficient oxygen production, and reduce the amount and cost of molecular sieves.

[0020] like Figure 4 、 5 As shown, the multiple slots on the end surface of the movable valve 3 include: An air inlet slot 31 for periodically connecting to the air inlet interface of the adsorption tower to realize air supply; A lower pressure equalizing slot 32 for periodically connecting the adsorption tower air inlet interface to achieve lower pressure equalization; The oxygen outlet slot 33 is used to collect the oxygen produced by the adsorption tower and guide it to the oxygen outlet hole 23; The upper pressure equalizing slot 34 is used to periodically connect the oxygen outlet interface of the adsorption tower to achieve upper pressure equalization; Backflush cleaning slot 35 for periodically connecting to the oxygen outlet interface of the adsorption tower to realize backflush cleaning; The nitrogen exhaust slot 36 is used to periodically connect to the air inlet interface of the adsorption tower to exhaust nitrogen.

[0021] Specifically, the air inlet slot 31, the lower pressure equalizing slot 32, and the nitrogen exhaust slot 36 on the end face of the movable valve 3 are periodically connected with the air inlet hole group 21 on the fixed valve 2 during the rotation process, and air is distributed to the adsorption tower through the adsorption tower air inlet interface 11 of the fixed valve seat 1 to achieve pressure equalization or discharge nitrogen; the oxygen outlet slot 33 continuously collects the oxygen produced by the adsorption tower and guides it to the oxygen exhaust hole 23 of the fixed valve 2; the upper pressure equalizing slot 34 and the backwash cleaning slot 35 are connected with 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 upper pressure equalization and backwash cleaning functions. Every time the movable valve 3 rotates one circle, each slot completes an on-off cycle with the corresponding hole group of the fixed valve 2 in turn, so that at least four adsorption towers synchronously complete the processes of air intake adsorption, pressure equalization, nitrogen exhaust desorption, backwash cleaning, etc., forming a continuous oxygen production cycle. The air inlet slot 31, the lower pressure-equalizing slot 32, the nitrogen exhaust slot 36, the oxygen outlet slot 33, the upper pressure-equalizing slot 34, and the backwash cleaning slot 35 respectively correspond to the core links of the adsorption tower operation, such as air intake, lower pressure-equalizing, nitrogen exhaust, oxygen exhaust, upper pressure-equalizing, and backwash cleaning, ensuring that the air intake distribution, pressure-equalizing balance, oxygen collection, impurity cleaning, and nitrogen exhaust regeneration processes of the adsorption tower are switched in an orderly manner during the continuous rotation of the dynamic valve 3, so that the complex operation process of at least four adsorption towers forms a closed loop, ensuring that each link is seamlessly connected. Each slot is designed to be periodically connected or disconnected, and in conjunction with the continuous rotation of the dynamic valve 3, it can quickly respond to the working conditions of the adsorption tower. The upper pressure-equalizing slot 34 and the lower pressure-equalizing slot 32 respectively perform pressure equalization from the oxygen outlet and air inlet ends of the adsorption tower, reducing the impact of pressure fluctuations on the adsorbent performance and reducing energy consumption; the backwash cleaning slot 35 regularly cleans impurities to maintain the adsorption efficiency of the adsorption tower; the nitrogen exhaust slot 36 discharges nitrogen, accelerates the regeneration of the adsorbent, and improves the continuity and stability of oxygen production. The multiple slots on the end face of the movable valve 3 are designed with function-oriented design, and their specific shapes (including but not limited to the slot arc length, width, depth, transition curvature and edge chamfer) 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 the volumes of different adsorption towers, and the flow channel profile can be adjusted to optimize high and low pressure difference working conditions; such geometric variations are all conventional design choices made by technical personnel in this field based on the same functional logic (i.e., periodic on-off control of the slots and fixed valve hole groups), and should be covered within the scope of protection of this patent.

[0022] like Figure 6 、7 As shown in , 8 and 9 , the upper end surface of the movable valve 3 is provided with an air source inlet 311 , and the air source inlet 311 is communicated with the air inlet slot 31 , and the side surface of the movable valve 3 is provided with a nitrogen exhaust ring groove 361 , and the nitrogen exhaust slot 36 is communicated with the nitrogen exhaust ring groove 361 .

[0023] Specifically, the gas source inlet 311 is connected to the gas source through the gas inlet pipe 312, and the nitrogen exhaust ring groove 361 is connected to the vacuum equipment through the nitrogen exhaust pipe 362 to discharge nitrogen. The nitrogen exhaust ring groove 361 on the side of the dynamic valve 3 is sealed on both the upper and lower sides to prevent nitrogen leakage. When the equipment is running, external compressed air as the air source enters through the gas inlet pipe 312, flows through the gas source inlet 311 on the upper end face of the dynamic valve 3 and enters the gas inlet slot 31; during the rotation of the dynamic valve 3, the gas inlet slot 31 is periodically connected to the gas inlet hole group 21 on the fixed valve 2, and the air enters the adsorption tower through the adsorption tower inlet interface 11 of the fixed valve seat 1. The air completes nitrogen adsorption in the adsorption tower, and the produced oxygen is collected through the oxygen outlet end of the adsorption tower, continuously collected by the oxygen outlet slot 33 of the dynamic valve, and guided to the oxygen exhaust hole 23 of the fixed valve 2, and finally transported to the outside through the oxygen outlet pipe. After an adsorption tower has produced more than 90% of its oxygen, it enters the pressure equalization phase, which utilizes impure oxygen to reduce energy consumption and improve extraction efficiency. Lower pressure equalization, or inlet-end pressure equalization, involves periodically connecting the lower pressure equalization slots 32 of the dynamic valve 3 to the inlet hole group 21 of the fixed valve 2. This equalizes the remaining impure oxygen in the current adsorption tower through the adsorption tower inlet port 11 to the inlet end of the other adsorption tower, which is currently under negative pressure. The upper pressure equalization, that is, the pressure equalization at the oxygen outlet end, the upper pressure equalization slot 34 of the movable valve 3 is connected to the oxygen outlet end of the adsorption tower through the adsorption tower oxygen outlet interface 12 of the fixed valve seat 1, balancing the pressure of the current adsorption tower oxygen outlet end to the oxygen outlet end of the other adsorption tower; when the movable valve 3 rotates to the nitrogen discharge stage, the nitrogen discharge slot 36 is periodically connected to the air inlet group 21 of the fixed valve 2, and the nitrogen adsorbed by the molecular sieve in the adsorption tower is discharged through the adsorption tower air inlet interface 11. During the nitrogen discharge process, nitrogen is only discharged through the nitrogen discharge slot 36, the nitrogen discharge ring groove 361, and the nitrogen discharge pipe 362 to avoid leakage. Simple vacuuming cannot completely remove the residual nitrogen in the molecular sieve. The backwash cleaning slot 35 of the movable valve 3 is connected to the oxygen outlet end of the adsorption tower through the adsorption tower oxygen outlet interface 12 of the fixed valve seat 1, and the high-concentration oxygen collected by the oxygen outlet slot 33 is reversely sent to the adsorption tower to backwash the molecular sieve and remove residual impurities. Every time the movable valve 3 rotates one circle, the air inlet slot 31, the lower pressure equalizing slot 32, the nitrogen exhaust slot 36, the oxygen outlet slot 33, the upper pressure equalizing slot 34, and the backflush cleaning slot 35 complete an on-off cycle in sequence 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.

[0024] like Figure 2 、 3As shown, the air inlet hole 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 hole 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.

[0025] Specifically, the air inlet hole group 21 on the end face of the fixed valve 2 is connected to the air inlet ends of at least four adsorption towers through the adsorption tower air inlet interface 11 of the fixed valve seat 1, and the oxygen outlet hole group 22 is connected to the oxygen outlet ends of the corresponding adsorption towers through the adsorption tower oxygen outlet interface 12 of the fixed valve seat 1, thereby realizing precise correspondence and centralized control of the gas pathways, ensuring that the raw gas stably enters each adsorption tower and oxygen is efficiently extracted, and making the gas path connections of multiple adsorption towers more orderly, simplifying the overall pipeline layout, and facilitating the coordinated switching of various processes in conjunction with the slots of the dynamic valve 3, thereby improving the coordination and reliability of the system operation.

[0026] like Figure 1 As shown, the main shaft 43 passes through the sealing ring 45 and is connected to the movable valve 3. The first friction plate 37 and the second friction plate 38 are respectively provided on the upper and lower sides of the movable valve 3.

[0027] Specifically, the servo drive unit 4 is installed 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 to connect to the movable valve 3 and is equipped with a sealing ring, and the first friction plate 37 and the second friction plate 38 are provided on the upper and lower sides of the movable valve 3. The sealing ring 45 and the sealing ring enhance the overall sealing performance to prevent gas leakage. The friction plate is provided to reduce the end face wear of the movable valve 3 during rotation. At the same time, the fixed structure of the upper cover 44 and the sealing ring 45 ensures the installation stability between the servo drive unit 4 and the movable valve 3 and the fixed valve 2, thereby ensuring that the drive transmission is accurate and efficient, and improving the reliability and service life of the equipment operation.

[0028] like Figure 1 As shown, the rotary support assembly 5 includes: a positioning shaft 51 fixed to the center of the fixed valve 2, and a deep groove ball bearing 52 installed on the positioning shaft 51. The movable valve 3 is supported and positioned by the deep groove ball bearing 52.

[0029] Specifically, in the rotating support assembly 5, the positioning shaft 51 fixed to the center of the fixed valve 2 is matched with the deep groove ball bearing 52 to support and position the movable valve 3, providing a stable structural support for the continuous rotation of the movable valve 3, reducing the radial shaking during the rotation process, ensuring the tightness and matching accuracy of the contact between the movable valve 3 and the end face of the fixed valve 2, and reducing the friction resistance during the rotation of the movable valve 3, improving the smoothness and stability of the rotation, thereby ensuring the accuracy of the on-off switching of each slot hole and the corresponding hole group, and enhancing the reliability of the overall operation of the equipment.

[0030] like Figure 1As shown, the first friction plate 37 is fixed to the fixed valve 2 by gluing a steel sleeve; the second friction plate 38 is fixed to the lower end surface 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 mounted on the fixed valve seat 1 by fixing screws, and the first friction plate 37 is located between the fixed valve 2 and the movable valve 3.

[0031] Specifically, the first friction plate 37 is fixed to the fixed valve 2 by gluing the steel sleeve and is located between the fixed valve 2 and the movable valve 3. The second friction plate 38 is fixed to the lower end surface of the friction disk 61 rigidly connected to the sealing ring 45. The fixed valve 2 is installed on the fixed valve seat 1 by fixing screws, which reduces the direct wear of the movable valve 3 and the fixed valve 2 during relative rotation, extends the service life of the components, and ensures the stability of the position of each component through rigid connection and fixed installation, ensures the accuracy of the cooperation between the movable valve 3 and the fixed valve 2, and improves the reliability of the overall operation.

[0032] like Figure 1 As shown, it also includes an axial pressing assembly 6, including: a compression spring 62 and a spring seat 63 installed on the friction disc 61, the compression spring 62 provides continuous axial pressure, so that the friction disc 61 drives the second friction plate 38 to axially press the first friction plate 37.

[0033] Specifically, the compression spring 62 and the spring seat 63 of the axial clamping assembly 6 are installed 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 movable valve 3 and the fixed valve 2 always maintain close contact, effectively avoiding gas leakage, ensuring the sealing and accuracy of the on-off coordination of each slot hole and the corresponding hole group, and at the same time compensating for the gap caused by component wear, maintaining stable contact pressure, and improving the long-term operation reliability of the equipment.

[0034] A molecular sieve oxygen production system comprises at least four adsorption towers and a multi-channel continuous rotary valve according to any one of claims 1 to 7, wherein the adsorption tower air inlet interface 11 of the multi-channel continuous rotary valve is respectively connected to the air inlet end of each adsorption tower, the adsorption tower oxygen outlet interface 12 is respectively connected to the oxygen outlet end of each adsorption tower, and the servo motor 41 is connected to a servo driver for speed adjustment.

[0035] Specifically, the air inlet interface 11 and the oxygen outlet interface 12 of the adsorption tower are respectively connected to the air inlet end and the oxygen outlet end of each adsorption tower through the multi-channel continuous rotary valve, and the servo motor 41 is connected to the servo driver for speed adjustment. With the help of the multi-channel continuous rotary valve, continuous switching of the processes such as air intake distribution, pressure equalization, and oxygen collection and derivation of each adsorption tower is realized. Combined with the precise control of the speed by the servo driver, it can flexibly adapt to different working conditions, which 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.

[0036] 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 exhaust pressure of each adsorption tower.

[0037] Specifically, the servo drive precisely controls the adsorption time, adsorption pressure, and nitrogen exhaust 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, and further improve the oxygen purity and output. At the same time, it allows the system to maintain optimal operating status under different working conditions, enhancing overall controllability and adaptability.

[0038] The present application discloses a multi-channel continuous rotary valve. The air inlet hole group 21 and the oxygen outlet hole group 22 on the end face of the fixed valve 2 are distributed along the circumference, while the multiple slots on the end face of the movable valve 3 are distributed in an annular shape and each has independent functions. When the servo drive unit 4 drives the movable valve 3 to rotate continuously, the slots on the movable valve 3 will form a periodic connection or disconnection state with the air inlet hole group 21, the oxygen outlet hole group 22, and the oxygen discharge hole 23 on the fixed valve 2 in turn according to the rotation cycle, accurately controlling the gas flow direction, and then collaboratively completing the continuous switching of multiple key processes required by at least four adsorption towers, including air intake distribution (providing raw gas to the adsorption tower), pressure equalization (balancing the pressure between different adsorption towers), oxygen collection and derivation (centrally transporting the produced oxygen), backflushing and cleaning (cleaning residual impurities in the adsorption tower), and nitrogen desorption (discharging nitrogen to regenerate the adsorbent). In the present application, the servo drive unit 4 is used to drive the dynamic valve 3 to rotate continuously, thereby replacing the intermittent switching of the traditional valve, so that the multiple working processes of each adsorption tower can be seamlessly connected and carried out continuously, greatly improving the operating efficiency and stability of the overall system; through the cooperation of the slots set on the dynamic valve 3 and the corresponding hole groups on the fixed valve 2, only one set of rotary valve structure is needed to simultaneously realize multiple operations of at least four adsorption towers, which greatly simplifies the equipment structure, reduces the number of pipelines and valves, and reduces the difficulty and cost of installation and maintenance. The continuous rotation mode reduces mechanical wear and energy loss, extends the life of the equipment, and reduces operating energy consumption. Combined with the adjustment of the speed by the servo drive, the adsorption time, pressure and other parameters can be reasonably controlled to realize complete adsorption, desorption and other processes, achieve continuous, stable and efficient oxygen production, and reduce the amount and cost of molecular sieves.

[0039] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings 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 movable valve (3), and a servo drive unit (4), wherein the movable valve (3) is connected to the fixed valve (2) via a rotary support assembly (5), and is characterized in that: The fixed valve seat (1) is provided with a plurality of adsorption tower air inlet interfaces (11) and adsorption tower oxygen outlet interfaces (12); The fixed valve (2) is fixedly mounted on the fixed valve seat (1), and its end surface facing the movable valve (3) is provided with an air inlet hole group (21) and an oxygen outlet hole group (22) distributed along a circumference, as well as an oxygen exhaust hole (23); The movable valve (3) is arranged above the fixed valve (2) and contacts the end surface of the fixed valve (2); the end surface of the movable valve (3) facing the fixed valve (2) is provided with a plurality of slots distributed in an annular manner and having independent functions; The servo drive unit (4) comprises a servo motor (41), a reducer (42) and a main shaft (43). The output end of the main shaft (43) is connected to the movable valve (3) to drive the movable valve to rotate continuously. The servo drive unit (4) is mounted on a sealing ring (45) through an upper cover (44). The sealing ring (45) is fixed on the fixed valve (2).

2. A multi-channel continuous rotary valve according to claim 1, characterized in that: The plurality of slots on the end surface of the movable valve (3) include: An air inlet slot (31) for periodically connecting to the adsorption tower air inlet interface (11) to realize air supply; A lower pressure equalizing slot (32) for periodically connecting to the adsorption tower air inlet interface (11) to achieve lower pressure equalization; An oxygen outlet slot (33) for collecting oxygen produced in the adsorption tower and directing it to the oxygen outlet hole (23); An upper pressure equalizing slot (34) for periodically connecting the adsorption tower oxygen outlet interface (12) to achieve upper pressure equalization; A backflushing cleaning slot (35) for periodically connecting to the adsorption tower oxygen outlet interface (12) to achieve backflushing cleaning; A nitrogen discharge slot (36) is used for periodically communicating with the adsorption tower air inlet interface (11) to discharge nitrogen.

3. A multi-channel continuous rotary valve according to claim 2, characterized in that: An air source inlet (311) is provided on the upper end surface of the movable valve (3), and the air source inlet (311) is communicated with the air inlet slot (31). A nitrogen exhaust ring groove (361) is provided on the side surface of the movable valve (3), and the nitrogen exhaust slot (36) is communicated with the nitrogen exhaust ring groove (361).

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

5. The multi-channel continuous rotary valve according to claim 1, characterized in that: The main shaft (43) passes through a sealing ring (45) and is connected to the movable valve (3). The movable valve (3) is provided with a first friction plate (37) and a second friction plate (38) on the upper and lower sides, respectively.

6. The multi-channel continuous rotary valve according to claim 1, characterized in that: The rotary support assembly (5) comprises: 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); the movable valve (3) is supported and positioned by the deep groove ball bearing (52).

7. The multi-channel continuous rotary valve according to claim 5, characterized in that: The first friction plate (37) is fixed to the fixed valve (2) by gluing a steel sleeve; the second friction plate (38) is fixed to the lower end surface 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 mounted on the fixed valve seat (1) by fixing screws, and the first friction plate (37) is located between the fixed valve (2) and the movable valve (3).

8. The multi-channel continuous rotary valve according to claim 7, characterized in that: The invention also includes an axial pressing assembly (6), comprising a compression spring (62) and a spring seat (63) mounted on the friction disc (61), wherein the compression spring (62) provides 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 production system, characterized in that: The invention comprises at least four adsorption towers and a multi-channel continuous rotary valve according to any one of claims 1 to 8, wherein the adsorption tower air inlet interface (11) of the multi-channel continuous rotary valve is respectively connected to the air inlet end of each adsorption tower, the adsorption tower oxygen outlet interface (12) is respectively connected to the oxygen outlet end of each adsorption tower, and the servo motor (41) is connected to a servo driver for speed regulation.

10. The molecular sieve oxygen production 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 exhaust pressure of each adsorption tower.

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