Pressure mode configurable printing dedicated air suspension centrifugal fan

Abstract

This invention discloses a pressure-mode configurable air-suspended centrifugal fan for printing, relating to the field of air-suspended fan technology. The fan includes a housing, a blower, an energy storage assembly, and a control valve group. The blower is connected to a pressure relief pipe via an air supply pipe. The core innovation lies in the control valve group's ability to sense the air supply pipe pressure and switch between three states via a first and second valve body. When the pressure is over-pressured, the first valve body opens, recovering surge energy into the tank and simultaneously enhancing the stability of the air film. When the pressure is under-pressured within the start-stop range, the second valve body aligns the channels via a sliding seat, guiding the pressure from the energy storage tank through the elastic tube to compensate for the air film. When the pressure is normal or extremely low, the channel automatically closes to store energy. This invention utilizes a specific arrangement of elastic tubes in the gaps of corrugated foil and a gravity-driven dense nozzle design to achieve energy recycling and reduce air bearing wear, significantly improving equipment lifespan, safety, and energy efficiency.

Description

Technical Field

[0001] This invention relates to the field of air suspension fan technology, specifically to a pressure-mode configurable air suspension centrifugal fan for printing. Background Technology

[0002] In printing production lines, fans are the core power source for drying systems, paper transport, and dust removal systems. Traditional printing processes often use Roots blowers or ordinary multi-stage centrifugal blowers, but these types of equipment generally suffer from high energy consumption, high noise levels, frequent maintenance (requiring regular replacement of lubricating oil and gears), and the risk of paper contamination due to oil leaks.

[0003] In recent years, with the advancement of carbon neutrality goals and the development of precision manufacturing, air-suspended high-speed centrifugal fans have gradually become the mainstream in the industry. This equipment integrates a permanent magnet synchronous motor, air foil bearings, and a three-dimensional flow impeller technology. Its working principle is as follows: a high-frequency inverter drives the permanent magnet motor to rotate the impeller at high speed. Inside the bearings, the dynamic pressure effect generated by the high-speed airflow forms elastic support, allowing the rotor to be completely suspended. This non-mechanical contact operation theoretically eliminates mechanical wear and requires no lubricating oil. The produced compressed air is completely oil-free and clean, and the overall energy saving rate is far higher than [previous standard].

[0004] However, the air volume requirements of the printing process fluctuate with the printing speed. When the required air volume decreases, the air pressure at the fan output increases, resulting in severe backflow and causing the fan to surge. Existing surge prevention solutions mostly use pressure relief valves to discharge the high-pressure gas at the fan output into the atmosphere, which wastes the useful work done by the impeller and reduces the overall energy efficiency of the system. Summary of the Invention

[0005] To solve the above problems, the present invention provides a pressure-mode configurable air-suspended centrifugal fan for printing, comprising: The housing contains an air suspension blower, and the housing is equipped with an air supply pipe connected to the air suspension blower. The housing is also equipped with a pressure relief pipe connected to the air supply pipe. The air suspension blower includes a housing, a rotating shaft, and an air bearing assembly. The air bearing assembly includes a bearing bushing, and a corrugated foil and a top plate coaxially arranged in sequence within the bearing bushing. The top plate is provided with a tangential nozzle for spraying air onto the surface of the rotating shaft. An energy storage assembly is used to collect the high-pressure gas discharged from the pressure relief pipe; A control valve assembly, which is connected to the pressure relief pipe, the energy storage component and the tangential nozzle respectively, is used to sense the pressure status of the air supply pipe, and when the pressure of the air supply pipe is lower than a set threshold, the high-pressure gas collected by the energy storage component is sent into the space between the rotating shaft and the top plate through the tangential nozzle.

[0006] Preferably, the control valve assembly switches between three flow paths based on pressure fluctuations in the air supply duct: When the air supply duct pressure exceeds the first threshold, the passage between the pressure relief pipe and the energy storage component is opened, and the passage between the pressure relief pipe and the tangential nozzle is opened simultaneously. When the air supply duct pressure is between the first threshold and the second threshold, the compensation path between the energy storage component and the tangential nozzle is activated. When the air supply duct pressure is lower than the second threshold, the compensation path between the energy storage component and the tangential nozzle is cut off.

[0007] Preferably, the bearing bushing has an air inlet hole, the control valve assembly is connected to the air inlet hole, and the tangential nozzle is connected to the end of the air inlet hole away from the control valve assembly by an elastic tube, the elastic tube being located in the gap of the corrugated foil.

[0008] Preferably, the spray direction of the tangential nozzle is consistent with the rotation direction of the rotating shaft, and the output end of the tangential nozzle is on the same arc surface as the inner wall of the top plate.

[0009] Preferably, multiple nozzles are provided, and the multiple nozzles are arranged at intervals around the axis of the top plate, with the nozzles closer to the direction of gravity of the rotating shaft being arranged more densely.

[0010] Preferably, the inner diameter of the elastic tube is a frustum shape that gradually narrows from one end of the elastic tube toward one end of the rotating shaft.

[0011] Preferably, the energy storage assembly includes an energy storage tank, and the end of the pressure relief pipe away from the air supply pipe is connected to a first pipeline and a second pipeline. The first pipeline connects the energy storage tank and the pressure relief pipe, and the second pipeline connects the pressure relief pipe to the tangential nozzle. The control valve group includes a first valve, which is disposed on the pressure relief pipe. When the pressure on the side of the first valve closest to the air supply pipe exceeds a first threshold, the first valve opens.

[0012] Preferably, a third pipeline is provided between the air supply pipe and the tangential nozzle, and a fourth pipeline is provided between the third pipeline and the energy storage tank. A second valve is provided at the connection between the fourth pipeline and the third pipeline. When the pressure on the side of the second valve near the air supply pipe is lower than a second threshold, or when the pressure on the side of the second valve near the air supply pipe exceeds a first threshold, the second valve body keeps both the fourth and third pipelines closed. When the pressure on the side of the second valve near the air supply pipe is between the first and second thresholds, the second valve body keeps the third and fourth pipelines connected.

[0013] Preferably, the first valve body is configured as a pressure relief valve, and the second valve body includes a three-way valve seat. The three-way valve seat is disposed at the connection between the third pipeline and the fourth pipeline. A mounting bracket is disposed inside the third pipeline. A mounting column is disposed on the mounting bracket and is coaxially arranged with the third pipeline. A slide block is coaxially slidably disposed on the mounting column. The outer wall of the slide block slidably abuts against the inside of the third pipeline. A reset member is coaxially sleeved on the mounting column. The reset member is used to reset the slide block. A sealing pipe is coaxially connected to the end of the slide block away from the mounting bracket. A through groove is disposed on the side wall of the sealing pipe near the fourth pipeline.

[0014] Preferably, the energy storage tank is provided with a third valve body, which is also configured as a pressure relief valve, and the threshold value set by the third valve body is the same as that of the first valve body.

[0015] This invention provides a pressure-mode configurable air-suspended centrifugal fan for printing applications. It offers the following advantages: 1. In critical situations where the blower surges, causing severe fluctuations in air supply pressure, damage to the air film in the bearing, and a high risk of mechanical contact, the first valve body recovers the harmful high-pressure airflow that would otherwise need to be dissipated and discharged. A portion of this energy is converted into compensating airflow in real time and directly injected into the bearing clearance. This physical pressurization forces the maintenance of the air film's integrity and stability, effectively resisting the instantaneous wear aggravation caused by the surge shock wave. The other portion of the recovered energy is converted into static pressure potential energy and stored in the energy storage tank. During subsequent equipment startup or shutdown, it is released by the control valve group to assist in accelerating the stable establishment of the air film or delaying its collapse in the low-speed range. Through this method of distributing excess energy in real time and with delayed reserves, not only is energy waste during the depressurization process reduced, but the wear of the shaft during dangerous conditions and startup is also minimized, greatly extending the service life of the core components of the air-suspended blower. Second, the inclusion of the elastic tube not only does not affect the function of the corrugated foil, but also, to a certain extent, achieves structural synergy with the corrugated foil through physical filling. The elastic tube in this invention acts as an additional viscoelastic damping element. When the vibration of the shaft causes radial deformation of the corrugated foil, the tube body is compressed and absorbs the vibration energy, significantly improving the damping characteristics of the air bearing. Simultaneously, the high-pressure gas flowing through the tube generates a certain degree of aerodynamic stiffness compensation, which, combined with the mechanical stiffness of the corrugated foil, enhances the support structure's ability to suppress shaft instability, resulting in better operational stability of the bearing during operation. Third, the elastic tube adopts a frustum-shaped contraction structure, which utilizes the Venturi effect to quickly convert the static pressure energy of the airflow into high momentum kinetic energy. Combined with the tangential offset direction of the tangential nozzle, it can make the jet airflow adhere to the surface of the rotating shaft to form a stable wall adhesion effect, thereby further accelerating the formation of the air film or prolonging the disappearance of the air film, which in turn further shortens the time of mutual friction between the rotating shaft and the top plate and further reduces the wear of the rotating shaft. IV. In this invention, all control valve assemblies employ purely mechanical valve bodies, and the valve body's activation and closure rely entirely on air pressure changes, completely eliminating dependence on sensors and frequency converter signals. In extreme environments such as sudden power outages in printing plants, when the air supply duct pressure rapidly disappears, the system instantly switches the flow channel using the mechanical energy of the reset component. This passive triggering mechanism ensures that even in the instant of power interruption, the gas in the energy storage tank can still be accurately injected into the bearing, achieving automatic protection of the system in the event of a fault and avoiding bearing burnout accidents caused by signal delays or control failures. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram of the internal structure of the box in an embodiment of this application; Figure 3 This is a schematic diagram of the connection structure between the energy storage component and the control valve group in the embodiments of this application; Figure 4 This is a schematic diagram of the air bearing assembly in an embodiment of this application; Figure 5 for Figure 4 A schematic diagram of the structure with the pivot shaft hidden in the middle; Figure 6 for Figure 5 Enlarged structural diagram at point A; Figure 7 for Figure 5 A schematic diagram of the structure of the corrugated foil and the top sheet is hidden. Figure 8 for Figure 7 Enlarged structural diagram at point B; Figure 9 This is a cross-sectional view of the air bearing assembly in an embodiment of this application; Figure 10 for Figure 9 Enlarged structural diagram at point C; Figure 11 This is a cross-sectional view of the second valve body in the embodiment of the application.

[0017] In the diagram: 1. Housing; 11. Air supply duct; 12. Pressure relief pipe; 2. Air suspension blower; 21. Housing; 22. Shaft; 23. Air bearing assembly; 231. Bearing bushing; 2311. Air inlet; 232. Corrugated foil; 233. Top plate; 234. Air guide ring; 2341. Air outlet; 3. Energy storage assembly; 31. Energy storage tank; 32. Tangential nozzle; 33. Elastic tube; 34. First pipeline; 35. Second pipeline; 4. Control valve assembly; 41. First valve body; 42. Third pipeline; 43. Fourth pipeline; 44. Second valve body; 441. Three-way valve seat; 442. Mounting bracket; 443. Mounting column; 444. Slide seat; 445. Reset component; 446. Sealing pipe; 4461. Through groove; 45. Third valve body. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0019] like Figures 1-11 As shown, the present invention provides a technical solution: a pressure mode configurable printing-specific air suspension centrifugal fan, including a housing 1, an air suspension blower 2, an energy storage component 3, and a control valve group 4.

[0020] Reference Figure 1 and Figure 2 The housing 1 contains a control center and a cavity for installing the air-bearing blower 2, which is existing technology and will not be described in detail here. The air-bearing blower 2 is fixedly installed inside the housing 1. In this embodiment, the air-bearing blower 2 includes a housing 21, a rotating shaft 22, and an air bearing assembly 23. An air supply pipe 11 is connected to the housing 21, and the end of the air supply pipe 11 away from the housing 21 extends to the outside of the housing 1. The air bearing assembly 23 includes a bearing bushing 231, and a corrugated foil 232 and a top plate 233 coaxially arranged in sequence within the bearing bushing 231. The rotating shaft 22 is coaxially located within the top plate 233. In this example, the top plate 233 is provided with a tangential nozzle 32 for spraying air onto the surface of the rotating shaft 22. In actual use, the air-bearing blower 2 also includes components such as a motor and fan blades, which are existing technologies and will not be described in detail here.

[0021] Reference Figure 2 ,、 Figure 3 , Figure 4 and Figure 7In this embodiment, the energy storage component 3 is used to collect the high-pressure gas discharged from the pressure relief pipe 12. The control valve group 4 is connected to the pressure relief pipe 12, the energy storage component 3, and the tangential nozzle 32. The control valve group 4 senses the pressure state of the air supply pipe 11 and, when the pressure in the air supply pipe 11 is lower than a set threshold, sends the high-pressure gas collected by the energy storage component 3 through the tangential nozzle 32 between the rotating shaft 22 and the top plate 233. Furthermore, the control valve group 4 in this embodiment switches between three flow paths based on the pressure fluctuations in the air supply pipe 11. When the pressure in the air supply pipe 11 exceeds the first threshold, the passage between the pressure relief pipe 12 and the energy storage component 3 is opened, and the passage between the pressure relief pipe 12 and the tangential nozzle 32 is opened simultaneously. When the pressure in the air supply duct 11 is between the first threshold and the second threshold, the compensation path between the energy storage component 3 and the tangential nozzle 32 is opened. When the pressure in the air supply duct 11 is lower than the second threshold, the compensation path between the energy storage component 3 and the tangential nozzle 32 is cut off.

[0022] When the required air volume at the output end of the printing equipment decreases, the air pressure at the output end of the air suspension blower 2 (i.e., inside the air supply pipe 11) will suddenly increase because it cannot be discharged. At this time, the pressure inside the air supply pipe 11 exceeds the first threshold, and the passage between the pressure relief pipe 12 and the energy storage component 3 is in a conductive state. At this time, the excess air in the air supply pipe 11 will enter the energy storage component 3 for storage. At the same time, even if the pressure at the air supply pipe 11 is restored by pressure relief, the impeller and shaft 22 inside the blower will still be affected by the pressure fluctuation at the air supply pipe 11, resulting in vibration. The vibration of the shaft 22 can easily cause the air film between the shaft 22 and the top plate 233 to become unbalanced or disappear, resulting in friction between the shaft 22 and the top plate 233. In this embodiment, when the pressure in the air supply pipe 11 exceeds the first threshold, not only are the passages between the pressure relief pipe 12 and the energy storage component 3 connected, but the passage between the pressure relief pipe 12 and the tangential nozzle 32 is also connected. Therefore, at this time, part of the high-pressure gas discharged from the air supply pipe 11 enters the middle of the energy storage component 3 for storage, while another part of the high-pressure gas enters the gap between the rotating shaft 22 and the top plate 233 through the nozzle. This replenishes the gas film between the rotating shaft 22 and the top plate 233 that is about to become unbalanced or disappear, thereby ensuring the stability of the gas film as much as possible. This avoids friction between the rotating shaft 22 and the top plate 233 as much as possible, greatly reducing the wear probability of the rotating shaft 22 and the top plate 233 and improving the service life of the rotating shaft 22 and the top plate 233.

[0023] In addition, when the equipment is in the shutdown stage, the speed of the impeller and the rotating shaft 22 will gradually decrease. When the speed of the impeller and the rotating shaft 22 decreases to a certain value, the air film between the rotating shaft 22 and the top plate 233 will disappear. At this time, the rotating shaft 22 will come into direct contact with the top plate 233 under the action of gravity. Since the rotating shaft 22 will continue to rotate due to inertia, friction will occur between the rotating shaft 22 and the top plate 233. In this embodiment, as the rotational speed of the impeller and the shaft 22 gradually decreases, the air pressure at the blower also gradually decreases. Therefore, when the pressure in the air supply pipe 11 decreases to between the first threshold and the second threshold, the compensation path between the energy storage component 3 and the tangential nozzle 32 is in a conductive state. The high-pressure gas stored in the energy storage component 3 enters the gap between the shaft 22 and the top plate 233 from the tangential nozzle 32. At this time, the gas ejected from the tangential nozzle 32 can delay the disappearance of the gas film between the shaft 22 and the top plate 233, thereby reducing the friction time between the shaft 22 and the top plate 233, and further reducing the wear of the shaft 22 and the top plate 233 and improving the service life of the shaft 22 and the top plate 233.

[0024] Similarly, during the startup phase of the equipment, the rotational speed of the impeller and the shaft 22 gradually increases. When the rotational speed of the shaft 22 has not yet increased to a certain value, the air film between the shaft 22 and the top plate 233 cannot be formed. Therefore, there is also friction between the shaft 22 and the top plate 233 at this time. The air pressure in the air supply pipe 11 is proportional to the rotational speed of the impeller and the shaft 22. Therefore, as the rotational speed increases, when the air pressure in the air supply pipe 11 rises to the second threshold, the compensation path between the energy storage component 3 and the tangential nozzle 32 is in a conductive state. At this time, the high-pressure gas stored in the energy storage component 3 enters the gap between the shaft 22 and the top plate 233 from the tangential nozzle 32, thereby accelerating the stable formation of the air film, reducing the wear of the shaft 22 and the top plate 233, and further improving the service life of the shaft 22 and the top plate 233.

[0025] When the equipment is not in operation, that is, when the equipment changes from a stopped state to a completely stopped state, when the speed of the impeller and the shaft 22 drops to a certain value, the air pressure in the air supply pipe 11 will also drop to a certain value. This value is set as the second threshold. Therefore, when the pressure in the air supply pipe 11 drops to the second threshold, the compensation passage between the energy storage component 3 and the tangential nozzle 32 is closed. At this time, the gas in the energy storage component 3 cannot flow out. Therefore, the remaining high-pressure gas in the energy storage component 3 continues to be stored for use when the equipment is started next time.

[0026] In general, the energy storage component 3 and control valve group 4 in this embodiment can automatically utilize and store excess high-pressure gas at the air supply pipe 11 by sensing the air pressure of the air supply pipe 11. This allows the device to not only avoid surge caused by backflow of air, but also reduce wear between the rotating shaft 22 and the top plate 233 by utilizing the discharged excess high-pressure gas, thereby greatly improving energy utilization and extending the service life of the device.

[0027] It should be noted that in this embodiment, the output end of the tangential nozzle 32 is on the same arc surface as the inner wall of the top plate 233, thereby avoiding scratches or more severe wear on the surface of the rotating shaft 22.

[0028] Furthermore, refer to Figure 4 , Figure 5 , Figure 6 and Figure 7 In this embodiment, multiple tangential nozzles 32 are provided. The multiple tangential nozzles 32 are arranged at intervals around the axis of the top plate 233. The nozzles closer to the direction of gravity of the rotating shaft 22 are arranged more densely. The number of tangential nozzles 32 depends on the specific situation. This design not only accelerates the formation of the gas film or prolongs its disappearance, but also allows the tangential nozzle 32 to exert a greater upward lifting force on the rotating shaft 22. Therefore, when the rotating shaft 22 is in the start-up phase, it is rotating, and the upward lifting force can accelerate the separation of the lowest point of the rotating shaft 22 from the lowest point of the top plate 233, thereby shortening the friction time between the rotating shaft 22 and the top plate 233. When the rotating shaft 22 is in the stop phase, it changes from rotating to stopping, delaying the contact time between the rotating shaft 22 and the top plate 233, and trying to make the rotating shaft 22 contact the top plate 233 after it stops rotating, thereby reducing the friction time between the rotating shaft 22 and the top plate 233, and further reducing the wear of the rotating shaft 22 and the top plate 233 as a whole.

[0029] Reference Figure 2 and Figure 3In this embodiment, the energy storage component 3 includes an energy storage tank 31, which is fixedly installed inside the housing 1. The upper end of the energy storage tank 31 is close to the upper cavity wall of the cavity inside the housing 1. In this embodiment, the end of the pressure relief pipe 12 away from the air supply pipe 11 is connected to both the first pipe 34 and the second pipe 35. The end of the first pipe 34 away from the pressure relief pipe 12 is connected to the energy storage tank 31, and the end of the second pipe 35 away from the pressure relief pipe 12 is connected to each tangential nozzle 32. In this embodiment, the control valve group 4 includes a first valve body 41, which is disposed on the pressure relief pipe 12. When the pressure on the side of the first valve body 41 near the air supply pipe 11 exceeds the first threshold, the first valve body 41 opens. That is, when the air pressure in the air supply pipe 11 exceeds the first threshold, the excess high-pressure gas in the air supply pipe 11 enters the energy storage pipe from the first pipeline 34 for storage, and the other part of the high-pressure gas enters each tangential nozzle 32 from the second pipeline 35, and then enters the space between the rotating shaft 22 and the top plate 233 from the output end of the tangential nozzle 32 to accelerate the formation of the gas film or delay the disappearance of the gas film.

[0030] Reference Figure 8 , Figure 9 and Figure 10For ease of connection, a guide ring 234 is coaxially fixedly fitted onto the bearing bushing 231 in this embodiment. The guide ring 234 in this embodiment has a hollow structure. Multiple air inlets 2311 are radially opened on the outer wall of the bearing bushing 231 in this embodiment, each air inlet 2311 penetrating the bearing bushing 231. All the multiple air inlets 2311 in this embodiment are located inside the guide ring 234, and each of the multiple air inlets 2311 corresponds one-to-one with a multiple tangential nozzle 32. The axis of the air inlet 2311 is aligned with the axis of the input end of the tangential nozzle 32. Along the same diameter, each tangential nozzle 32 in this embodiment is connected to an elastic tube 33. The elastic tube 33 in this embodiment is specifically made of rubber material. One end of the elastic tube 33 is elastically inserted into the input end of the tangential nozzle 32, and the other end of the elastic tube 33 is elastically inserted into the corresponding air inlet 2311. The end of the second pipe 35 away from the pressure relief pipe 12 is connected to the outer wall of the air guide ring 234. Therefore, when high-pressure gas flows into the second pipe 35, the air guide ring 234 can relatively evenly send the high-pressure gas in the second pipe 35 into each tangential nozzle 32. In addition, in this embodiment, the inner diameter of the tangential nozzle 32 gradually narrows into a frustum shape from the end away from the rotating shaft 22 toward the end of the rotating shaft 22. The static pressure energy of the airflow is quickly converted into high momentum kinetic energy. In this embodiment, the injection direction of the tangential nozzle 32 is consistent with the rotation direction of the rotating shaft 22. The high momentum kinetic energy airflow, combined with the tangential offset direction of the nozzle, enables the injected airflow to adhere to the surface of the rotating shaft 22 to form a stable wall adhesion effect, thereby further accelerating the formation of the gas film or prolonging the disappearance of the gas film, and further shortening the time of mutual friction between the rotating shaft 22 and the top plate 233 and further reducing the wear of the rotating shaft 22.

[0031] It should be noted that, in practical applications, in this embodiment, the end of the second pipe 35 furthest from the pressure relief pipe 12 passes through the bottom of the housing 21 and connects to the bottom of the air guide ring 234. Therefore, the gas entering the air guide ring 234 will preferentially enter the tangential nozzle 32 at the bottom of the rotating shaft 22, thereby ensuring that the bottom of the rotating shaft 22 separates from the top plate 233 earlier when the equipment starts up or contacts the top plate 233 later when the equipment stops. In addition, in this embodiment, the corrugated foil 232 and the bearing bushing 231 are fixedly connected by a snap-fit ​​method, and the top plate 233 and the foil are fixedly connected by welding. These are all existing technologies and will not be described in detail here. In this embodiment, all nozzles and their corresponding elastic tubes 33 are located in the gap between the corrugated foil 232 and the bearing bushing 231. Therefore, the nozzles and elastic tubes 33 will not affect the normal installation of the corrugated foil 232 and the top plate 233. When installing the corrugated foil 232 and the top plate 233, the elastic tube 33 is first inserted into the corresponding tangential nozzle 32, and then the connector of the corrugated foil 232 and the top plate 233 is placed into the bearing bushing 231. At this time, the elastic tube 33 corresponds to the air inlet 2311 on the bearing bushing 231. Press the top plate 233 so that the end of the elastic tube 33 away from the tangential nozzle 32 is squeezed into the air inlet 2311. This design ensures that the air inlet 2311 and the nozzle are always in a stable communication state. In this embodiment, the corrugation gap of the corrugated foil 232 can be designed to be slightly larger. Although this will reduce the elasticity of the corrugated foil 232, the elasticity of the elastic tube 33 itself can supplement the elasticity of the corrugated foil 232, thereby ensuring the normal operation of the rotating shaft 22.

[0032] Reference Figure 2 , Figure 3 and Figure 11 In this embodiment, a third pipe 42 is provided between the air supply pipe 11 and the air guide ring 234, and a fourth pipe 43 is provided between the energy storage tank 31 and the third pipe 42. The end of the fourth pipe 43 away from the third pipe 42 is also connected to the outer wall of the air guide ring 234. A second valve body 44 is provided at the connection between the third pipe 42 and the fourth pipe 43. When the pressure on the side of the second valve body 44 near the air supply pipe 11 is lower than the second threshold, or when the pressure on the side of the second valve body 44 near the air supply pipe 11 exceeds the first threshold, the second valve body 44 keeps both the fourth pipe 43 and the third pipe 42 in a closed state. When the pressure on the side of the second valve body 44 near the air supply pipe 11 is between the first threshold and the second threshold, the second valve body 44 keeps the third pipe 42 and the fourth pipe 43 in a connected state.

[0033] Therefore, when the equipment transitions from the running state to the shutdown state, the rotational speed of the shaft 22 will gradually decrease, and the air pressure in the air supply duct 11 will also gradually decrease. When the air pressure in the air supply duct 11 decreases to the first threshold and the second threshold, the third pipe 42 and the fourth pipe 43 are connected. The air pressure stored in the energy storage tank 31 enters the air guide ring 234 through the third pipe 42 and the fourth pipe 43, and then enters the gap between the top plate 233 and the shaft 22 from each tangential nozzle 32, thereby compensating for the air film between the shaft 22 and the top plate 233 and delaying the disappearance of the air film.

[0034] When the equipment enters the running state from the shutdown state, the rotation speed of the rotating shaft 22 will gradually increase, and the air pressure in the air supply pipe 11 will also gradually increase. When the air pressure in the air supply pipe 11 rises to the second threshold and the first threshold, the third pipe 42 and the fourth pipe 43 are also connected. The air pressure stored in the energy storage tank 31 can also enter the gap between the top plate 233 and the rotating shaft 22 from each tangential nozzle 32, thereby accelerating the formation of the air film between the rotating shaft 22 and the top plate 233.

[0035] It should be noted that when the air pressure in the air supply pipe 11 is lower than the second threshold, the rotation speed of the corresponding rotating shaft 22 is also extremely low, or the rotating shaft 22 is stationary. At this time, it can be determined that the equipment is in a shutdown state. Therefore, the second valve body 44 closes the third pipe 42 and the fourth pipe 43. At this time, the gas in the energy storage tank 31 cannot flow out, and the energy storage tank 31 performs the function of storing gas so that it can supply gas to the tangential nozzle 32 when the equipment is started next time.

[0036] Furthermore, in this embodiment, the energy storage tank 31 has an opening at its upper end that extends to the outside of the housing 1, and a third valve body 45 is installed at this opening. In this embodiment, the first valve body 41 and the third valve body 45 are identical and both are pressure relief valves. Their function is to open the valve body when the pressure on one side reaches a certain threshold. This is existing technology and will not be elaborated upon further. The third valve body 45 helps prevent the energy storage tank 31 from exploding due to storing too much gas.

[0037] In this embodiment, the second valve body 44 includes a three-way valve seat 441, which is disposed at the connection between the third pipe 42 and the fourth pipe 43. A mounting bracket 442 is disposed inside the third pipe 42. In this embodiment, the mounting bracket 442 is configured as a cross shape. A mounting post 443 is disposed on the mounting bracket 442 and is coaxially fixedly connected to the third pipe 42. A slide block 444 is coaxially slidably disposed on the mounting post 443. The outer wall of the slide block 444 slides against the inside of the third pipe 42. In this embodiment, the slide block 444 blocks the third pipe 42 near the air supply pipe 11 to prevent gas in the air supply pipe 11 from entering the third pipe 42. A reset element 445 is coaxially sleeved on the mounting column 443. In this embodiment, the reset element 445 is set as a spring. The end of the slide 444 away from the mounting bracket 442 is coaxially connected to a sealing tube 446. The sealing tube 446 is provided with a through groove 4461 on the side wall near the fourth pipe 43. In the initial state, the spring is in a relaxed state. The through groove 4461 is located in the third pipe 42 near the air supply pipe 11. The wall of the sealing tube 446 on the right side of the through groove 4461 seals the connection between the third pipe 42 and the fourth pipe 43.

[0038] When the equipment starts, the air pressure in the air supply duct 11 gradually increases. At this time, the air pressure on the side of the slide 444 near the air supply duct 11 gradually increases, causing the slide 444 and the sealing pipe 446 to move away from the air supply duct 11. The spring begins to be gradually stretched. When the air pressure in the air supply duct 11 rises to the second threshold, the through groove 4461 on the sealing pipe 446 moves to the connection point of the third pipe 42 and the fourth pipe 43. At this point, the third pipe 42 and the fourth pipe 43 are connected. As the sealing pipe 446 continues to move, the connection area between the third pipe 42 and the fourth pipe 43 increases, allowing more gas to flow from the storage... The energy flows from tank 31 to tangential nozzle 32; as the air pressure in air supply pipe 11 rises to the first threshold, the through groove 4461 on the sealing pipe 446 passes completely through the connection between the third pipe 42 and the fourth pipe 43. At this time, the third pipe 42 and the fourth pipe 43 are in a non-conductive state, and the equipment has reached a stable operating state. The air film between the rotating shaft 22 and the top plate 233 is also stably formed, and no air replenishment is required. Similarly, when the equipment is shut down, the air pressure at air supply pipe 11 gradually decreases, and the spring reset drives the slide 444 and the sealing pipe 446 to move back. The third pipe 42 and the fourth pipe 43 first enter the conductive state and finally enter the non-conductive state.

[0039] Working principle: When the fan starts to accelerate or decelerates and stops (the pressure in the air supply pipe 11 is between the second threshold and the first threshold), the pressure in the air supply pipe 11 acts on the slide 444 of the second valve body 44, overcoming the force of the return spring and causing the slide 444 to move axially, which in turn moves the through groove 4461 on the sealing pipe 446 to the connection point between the third pipe 42 and the fourth pipe 43. At this time, the gas in the energy storage tank 31 is distributed by the air guide ring 234 and, through the elastic tube 33 that shuttles through the gaps in the corrugated foil 232, is shot at high speed from the tangential nozzles 32 that are densely distributed in the direction of gravity on the top plate 233 towards the surface of the rotating shaft 22, establishing static pressure support.

[0040] When the fan is operating normally (pressure exceeds the first threshold but does not reach the surge point), the high pressure further pushes the slide 444, causing the through slot 4461 to cross the connection port. The third pipe 42 and the fourth pipe 43 are blocked again by the wall of the slide 444, stopping air consumption. Once surge occurs (pressure surge triggers the first threshold), the first valve body 41 is opened under pressure. Part of the depressurized airflow enters the energy storage tank 31 for energy storage, and the other part enters the nozzle directly through the second pipe 35 to forcibly reinforce the airflow film. When the fan stops completely (pressure is below the second threshold), the slide 444 is fully reset under the action of the spring force, the through slot 4461 is misaligned, and the energy storage tank 31 achieves long-term sealed energy storage.

[0041] Therefore, this equipment achieves closed-loop energy management without the need for external air sources and electrical control intervention, which greatly improves energy utilization and ensures high reliability of the printing blower under frequent start-stop conditions.

[0042] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A pressure-mode configurable air-suspended centrifugal fan for printing, characterized in that, include: The box (1) is equipped with an air suspension blower (2) inside the box (1), and an air supply pipe (11) connected to the air suspension blower (2) is provided on the box (1). The box (1) is also equipped with a pressure relief pipe (12) connected to the air supply pipe (11). The air suspension blower (2) includes a housing (21), a rotating shaft (22) and an air bearing assembly (23). The air bearing assembly (23) includes a bearing bushing (231), and a corrugated foil (232) and a top plate (233) coaxially disposed in the bearing bushing (231). The top plate (233) is provided with a tangential nozzle (32) for spraying air onto the surface of the rotating shaft (22). Energy storage component (3) is used to collect the high-pressure gas discharged from the pressure relief pipe (12); The control valve assembly (4) is connected to the pressure relief pipe (12), the energy storage assembly (3) and the tangential nozzle (32) respectively, to sense the pressure state of the air supply pipe (11), and when the pressure of the air supply pipe (11) is lower than the set threshold, the high-pressure gas collected by the energy storage assembly (3) is sent through the tangential nozzle (32) between the rotating shaft (22) and the top plate (233).

2. The pressure mode configurable air suspension centrifugal fan for printing as described in claim 1, characterized in that: The control valve group (4) switches between three flow paths based on the pressure fluctuations of the air supply pipe (11): When the pressure in the air supply pipe (11) exceeds the first threshold, the passage between the pressure relief pipe (12) and the energy storage component (3) is opened, and the passage between the pressure relief pipe (12) and the tangential nozzle (32) is opened simultaneously. When the pressure in the air supply duct (11) is between the first threshold and the second threshold, the compensation path between the energy storage component (3) and the tangential nozzle (32) is opened; When the pressure in the air supply pipe (11) is lower than the second threshold, the compensation path between the energy storage component (3) and the tangential nozzle (32) is cut off.

3. A pressure-mode configurable air-suspended centrifugal fan for printing as described in claim 1, characterized in that: An air inlet (2311) is provided on the bearing bushing (231), the control valve group (4) is connected to the air inlet (2311), and the end of the tangential nozzle (32) away from the control valve group (4) is connected to an elastic tube (33), which is located in the gap of the corrugated foil (232).

4. A pressure-mode configurable air-suspended centrifugal fan for printing as described in claim 3, characterized in that: The spray direction of the tangential nozzle (32) is consistent with the rotation direction of the rotating shaft (22), and the output end of the tangential nozzle (32) is on the same arc surface as the inner wall of the top plate (233).

5. A pressure-mode configurable air-suspended centrifugal fan for printing as described in claim 4, characterized in that: The nozzles are arranged in multiple ways, and the multiple nozzles are arranged at intervals around the axis of the top plate (233). The nozzles closer to the gravity direction of the rotating shaft (22) are arranged more densely.

6. A pressure-mode configurable air-suspended centrifugal fan for printing as described in claim 3, characterized in that: The inner diameter of the elastic tube (33) gradually narrows from one end of the elastic tube (33) toward one end of the rotating shaft (22) into a frustum shape.

7. A pressure-mode configurable air-suspended centrifugal fan for printing as described in claim 2, characterized in that: The energy storage assembly (3) includes an energy storage tank (31). The end of the pressure relief pipe (12) away from the air supply pipe (11) is connected to a first pipe (34) and a second pipe (35). The first pipe (34) connects the energy storage tank (31) and the pressure relief pipe (12). The second pipe (35) connects the pressure relief pipe (12) to the tangential nozzle (32). The control valve assembly (4) includes a first valve body (41). The first valve body (41) is disposed on the pressure relief pipe (12). When the pressure on the side of the first valve body (41) near the air supply pipe (11) exceeds a first threshold, the first valve body (41) opens.

8. A pressure-mode configurable air-suspended centrifugal fan for printing as described in claim 7, characterized in that: A third pipe (42) is provided between the air supply pipe (11) and the tangential nozzle (32), and a fourth pipe (43) is provided between the third pipe (42) and the energy storage tank (31). A second valve body (44) is provided at the connection between the fourth pipe (43) and the third pipe (42). When the pressure on the side of the second valve body (44) near the air supply pipe (11) is lower than the second threshold, or when the pressure on the side of the second valve body (44) near the air supply pipe (11) exceeds the first threshold, the second valve body (44) keeps both the fourth pipe (43) and the third pipe (42) in a closed state. When the pressure on the side of the second valve body (44) near the air supply pipe (11) is between the first threshold and the second threshold, the second valve body (44) keeps the third pipe (42) and the fourth pipe (43) in a connected state.

9. A pressure-mode configurable air-suspended centrifugal fan for printing as described in claim 8, characterized in that: The first valve body (41) is configured as a pressure relief valve, and the second valve body (44) includes a three-way valve seat (441). The three-way valve seat (441) is located at the connection between the third pipeline (42) and the fourth pipeline (43). A mounting bracket (442) is provided inside the third pipeline (42), and a mounting post (443) is provided on the mounting bracket (442) and coaxially arranged with the third pipeline (42). A mounting post (443) is slidably mounted on the mounting post (443) on the mounting post (443). A sliding block (444) is provided, which is in a sealed sliding fit with the third pipeline (42). A reset member (445) is coaxially sleeved on the mounting column (443). The reset member (445) is used to reset the sliding block (444). A sealing tube (446) is coaxially connected to one end of the sliding block (444) away from the mounting bracket (442). A through groove (4461) is provided on the side wall of the sealing tube (446) near the fourth pipeline (43).

10. A pressure-mode configurable air-suspended centrifugal fan for printing as described in claim 7, characterized in that: The energy storage tank (31) is provided with a third valve body (45), which is also configured as a pressure relief valve, and the threshold value set by the third valve body (45) is the same as that of the first valve body (41).

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