An integrated fan module and variable boost ratio regulation system

Abstract

This application relates to an integrated fan module and a variable boost ratio adjustment system, belonging to the field of magnetic drive fan technology. The integrated fan module includes an end cover, an impeller housing, a shaft, an impeller, an inner magnetic assembly, and a shield. The end cover is connected to a delivery pipe, and the two ends of the shaft are connected to the impeller and the inner magnetic assembly, respectively. The shaft has an airflow channel connecting the delivery pipe and the internal space of the shield. The internal space of the shield is connected to the air cavity inside the impeller housing to form a continuous air exchange and cooling path. The variable boost ratio adjustment system includes two integrated fan modules with different impeller sizes, a second motor, an outer magnetic assembly, and a switching drive assembly. The switching drive assembly allows one of the outer magnetic assemblies to be magnetically coupled to one of the two inner magnetic assemblies. This application features a compact structure, stable heat dissipation, easy disassembly and maintenance, and adaptability to different flow rates and boost ratios.

Description

Technical Field

[0001] This application relates to the field of magnetically driven fan technology, and in particular to an integrated fan module and a variable boost ratio adjustment system. Background Technology

[0002] In scenarios involving the transport of corrosive gases, toxic gases, or other gases requiring closed-loop transport, some fans employ magnetic coupling to transmit power and prevent contact between the transported gas and the drive motor. These fans typically house the inner magnetic assembly connected to the impeller within a shield, while the outer magnetic assembly connected to the motor is located outside the shield. The impeller is driven to rotate through the magnetic coupling between the inner and outer magnetic assemblies, with the shield isolating the drive motor and the transported gas.

[0003] However, during high-speed operation, magnetic coupling structures are prone to heat generation due to factors such as relative slippage of magnets, induction heating, and bearing friction. Since the inner magnetic components are located inside a relatively enclosed shield, the gas inside the shield is not easily exchanged with the outside, and heat tends to accumulate near the inner magnetic components and the shield, thus affecting the operational stability and service life of the magnetic coupling structure.

[0004] For example, US Patent 4207485A discloses a magnetic coupling device in which an axially extending hole is provided in the driven shaft, and a radial hole is provided near the impeller. When the driven shaft rotates, the process medium is discharged from the axial hole and the radial hole into the process medium area between the support wall and the impeller under centrifugal force, and the process medium is correspondingly drawn in through the fluid bearing, the internal magnetic coupling element, the internal magnet and the sealing wall before entering the axial hole, thereby forming a circulating flow path for lubricating the bearing and cooling the magnetic coupling structure.

[0005] The aforementioned structure primarily utilizes the centrifugal pumping effect generated by the rotation of the shaft to create a localized circulation of the process medium around the magnetic coupling structure and the fluid bearing. However, when applied to a fan that continuously transports gas, the areas where the cooling medium enters the cooling path and exits through the radial holes are concentrated in the adjacent space between the support wall and the impeller. The gas exiting through the radial holes may re-enter the cooling path from nearby areas, causing some gas to circulate repeatedly within a localized area, which is detrimental to the continuous renewal of the gas inside the shield.

[0006] Furthermore, in existing magnetically driven fans, the impeller, shaft support structure, magnetic coupling structure, and air intake structure are typically mounted on different casings or support components, and an independent connection structure is also required between the fan and the delivery pipeline. When it is necessary to inspect or replace the impeller, shaft, or magnetic coupling structure, multiple components often need to be disassembled sequentially, making the installation and maintenance process cumbersome and hindering the compactness and modularity of the fan structure. Summary of the Invention

[0007] To address the aforementioned issues, this application provides an integrated fan module and a variable boost ratio adjustment system.

[0008] The integrated fan module provided in this application adopts the following technical solution: An integrated fan module includes an end cover and an impeller housing, wherein the end cover is connectable to the end of a delivery pipe and is rotatably connected to a rotating shaft; The two ends of the rotating shaft are respectively connected to an impeller and an inner magnetic assembly. A shielding cover is provided on the side of the end cover away from the conveying pipe, and the shielding cover is placed on the outer periphery of the inner magnetic assembly. The rotating shaft is rotatably connected to the impeller housing; The end cover is provided with a main air intake channel, the impeller housing is provided with an air chamber, the impeller housing is provided with a first air intake port, and the first air intake port of the main air intake channel is connected to the air chamber; The impeller can draw gas from the air chamber and discharge it from the impeller housing; The rotating shaft has an air passage, the air inlet of the air passage is connected to the delivery pipe, the air outlet of the air passage is connected to the internal space of the shield, and the internal space of the shield is connected to the air cavity.

[0009] By adopting the above technical solution, the impeller can continuously draw gas from the air chamber during operation, allowing gas in the main intake channel to enter the air chamber through the first intake port and be discharged into the delivery pipe by the impeller. Simultaneously, since the internal space of the shield is connected to the air chamber, gas in the internal space of the shield can enter the air chamber under the suction of the impeller, and gas in the delivery pipe can be replenished into the internal space of the shield through the air passage of the rotating shaft, thus forming a continuous ventilation path from the delivery pipe through the air passage, the internal space of the shield, and the air chamber to the impeller. This allows for continuous gas renewal inside the shield, carrying away heat generated by the internal magnetic components and near the shield, reducing the stagnation or localized recirculation of hot gas inside the shield, and improving the stability of the magnetic drive structure. Furthermore, the rotating shaft, impeller, internal magnetic components, shield, and impeller housing are all directly or indirectly integrated into the end cover. After the end cover is connected to the end of the delivery pipe, the entire fan module can be installed. When the end cover is removed, the above components can be removed as a whole, making the fan structure more compact and improving the convenience of installation, maintenance, and replacement.

[0010] Optionally, it also includes a pressure cap, wherein the end cap has a stepped hole, the rotating shaft passes through the stepped hole, and a first bearing sleeved on the outer periphery of the rotating shaft is provided in the stepped hole; The pressure cap is connected to the end cap and extends into the stepped hole, and the first bearing is axially positioned between the stepped surface of the stepped hole and the pressure cap along the axis of the rotating shaft. The pressure cap is sleeved on the outer periphery of the rotating shaft, and a return channel communicating with the air cavity is formed between the inner peripheral surface of the pressure cap and the outer peripheral surface of the rotating shaft. The pressure cap has at least one first flow channel, and the end cap has at least one second flow channel. One end of the first flow channel is connected to the return channel, and the other end of the first flow channel is connected to the second flow channel. The end of the second flow channel away from the first flow channel is connected to the internal space of the shield.

[0011] By adopting the above technical solution, the stepped surface of the stepped hole cooperates with the pressure cap to axially limit the first bearing, so that the rotating shaft is stably supported within the end cap. Simultaneously, a return flow channel is formed between the pressure cap and the rotating shaft. The internal space of the shielding cover is sequentially connected to the air chamber through the second flow channel on the end cap, the first flow channel on the pressure cap, and the return flow channel, thus providing a specific communication structure between the internal space of the shielding cover and the air chamber. The pressure cap participates in both the installation and limiting of the first bearing and in forming the gas return path, integrating the rotating shaft support structure with the ventilation structure. This reduces independent flow channel components and connecting structures, making the fan module structure more compact.

[0012] Optionally, the impeller housing has a second air inlet communicating with the air chamber, and the end cover has a secondary air inlet channel. The secondary air inlet channel is used to communicate with the return pipe at the exhaust end of the conveying pipe, and the secondary air inlet channel is connected to the air chamber through the second air inlet. It also includes a flow regulation component, which can adjust the flow area of ​​the first air inlet and the second air inlet.

[0013] By adopting the above technical solution, a portion of the gas at the exhaust end of the conveying pipeline can re-enter the gas chamber through the return pipeline, the auxiliary intake channel, and the second intake port, thus forming a return flow path between the exhaust end of the conveying pipeline and the intake side of the impeller. The flow regulation component can adjust the main intake volume entering the gas chamber through the main intake channel and the return flow volume entering the gas chamber through the auxiliary intake channel by adjusting the flow area of ​​the first and second intake ports, thereby changing the flow distribution between the main intake and the return flow according to the actual operating conditions. When the required external conveying flow is small, the return flow volume can be increased to allow some of the discharged gas to re-participate in the impeller circulation, thereby reducing the external output flow while maintaining the required gas flow inside the impeller. This is beneficial for improving the stability of the fan under different flow conditions and expanding the fan's flow regulation range.

[0014] Optionally, the impeller housing and the end cover are spaced apart along the axial direction of the rotating shaft and together form an installation space; The flow regulating assembly includes an annular regulating plate, which is rotatably disposed within the installation space and sleeved on the outer periphery of the rotating shaft. The outer periphery of the annular regulating plate is provided with driven teeth. The end cover is equipped with a first motor, and the output end of the first motor is connected to a drive gear, which meshes with the driven gear. The annular adjusting plate has a first adjusting port and a second adjusting port. When the annular adjusting plate rotates, the overlapping area of ​​the first adjusting port and the first air inlet increases, while the overlapping area of ​​the second adjusting port and the second air inlet decreases.

[0015] By adopting the above technical solution, the first motor can drive the annular regulating plate to rotate through the meshing of the driving gear and the driven gear. This causes the overlapping areas of the first regulating port and the first air inlet, as well as the overlapping areas of the second regulating port and the second air inlet, to change in opposite directions. Thus, the flow areas of the main air inlet channel and the auxiliary air inlet channel are simultaneously adjusted by a single annular regulating plate, achieving a coordinated distribution between the main air intake volume and the return air volume. This eliminates the need for separate regulating valves and drive mechanisms, improving the consistency and response efficiency of flow regulation. Furthermore, the annular regulating plate is positioned within the installation space between the impeller housing and the end cover, while the first motor and transmission structure are mounted on the end cover. This integrates the flow regulation structure with the fan module, reducing the need for external valves, pipes, and mounting brackets, resulting in a more compact overall structure and facilitating overall installation, disassembly, and maintenance along with the end cover.

[0016] Optionally, the impeller housing includes a volute and a rear cover and a front cover respectively connected to the two axial ends of the volute. An annular partition is provided inside the volute, which divides the internal space of the volute into an air chamber and an impeller chamber arranged axially along the shaft. The air chamber is located on the side of the annular partition closer to the rear cover, and the impeller chamber is located on the side of the annular partition closer to the front cover. Both the first air inlet and the second air inlet are located on the rear cover. The inner circumference of the annular partition forms an air extraction port that connects the air chamber and the impeller chamber. The rotating shaft passes through the air chamber and the air extraction port and extends into the impeller chamber. The impeller is disposed in the impeller chamber. The end of the rotating shaft away from the rear cover extends into the front cover, and a second bearing is fitted onto the end of the rotating shaft that extends into the front cover; The front cover is connected to an end cap, and the second bearing is positioned between the front cover and the end cap along the axial direction of the rotating shaft. The end cap has an air inlet hole, through which gas can enter the air passage in sequence.

[0017] By adopting the above technical solution, the rear cover, volute, annular baffle, and front cover together form an air chamber and impeller chamber arranged axially along the rotating shaft. The gas input from the main intake channel and the auxiliary intake channel first enters the air chamber, then enters the impeller chamber through the suction port on the inner circumference of the annular baffle and is discharged by the impeller, thus forming a main gas delivery path with a clear direction. The annular baffle can not only separate the air chamber and the impeller chamber, but also concentrate and guide the gas, so that the gas entering the air chamber flows relatively stably to the intake area of ​​the impeller.

[0018] Meanwhile, the front end of the shaft is rotatably supported by the front cover via a second bearing. The second bearing is axially limited by the front cover and the end cap, which helps improve the support stability of the shaft and impeller during rotation. The air inlet on the end cap cooperates with the air passage of the shaft, allowing gas in the conveying pipeline to enter the air passage through the air inlet and then replenish the internal space of the shield. Therefore, while forming the main gas delivery path, the impeller housing also integrates the front support structure of the shaft and the air inlet structure for cooling gas of the shield, making the impeller, shaft support, and ventilation and cooling structure centrally located, resulting in a more compact overall structure that is easier to assemble and maintain.

[0019] Optionally, the rear cover has an installation opening, and one end of the pressure cap extends into the installation opening; The outer periphery of the pressure cap is provided with a shoulder, and the rear cover has a receiving groove on the side facing the end cover. The receiving groove, the pressure cap, and the end cover together form the installation space. A third bearing is fitted around the outer periphery of the pressure cap. The third bearing is axially positioned between the rear cover and the shoulder along the shaft. The annular adjusting plate is fitted around the outer periphery of the third bearing.

[0020] By adopting the above technical solution, the rear cover, pressure cover, and end cover together form an installation space for mounting the annular regulating plate. This allows the annular regulating plate and its rotating support structure to be integrated between the impeller housing and the end cover, reducing the need for additional independent mounting seats or support frames and making the flow regulation structure more compact. The third bearing is sleeved on the outer circumference of the pressure cover and is limited axially by the rear cover and the shaft shoulder, enabling the annular regulating plate to rotate stably relative to the pressure cover via the third bearing, thereby reducing the frictional resistance and radial sway during the rotation of the annular regulating plate. At the same time, the pressure cover participates in the installation of the rotating shaft and the first bearing, and also serves as the rotating support base for the annular regulating plate, which helps to improve the integration between the various structures and facilitates overall assembly and disassembly.

[0021] Optionally, the volute has a gradually increasing flow guide portion surrounding the impeller, the gradually increasing flow guide portion having an inner flow guide surface facing the impeller and an outer flow guide surface facing the inner wall of the conveying pipe; along the rotation direction of the impeller, the distance between the inner flow guide surface and the outer edge of the impeller gradually increases, the distance between the outer flow guide surface and the inner wall of the conveying pipe gradually decreases, and the gas is discharged from the circumference of the gradually increasing flow guide portion.

[0022] By adopting the above technical solution, the distance between the inner guide surface and the outer edge of the impeller gradually increases along the impeller's rotation direction. This allows the gas discharged radially from the impeller to gather within the gradually expanding impeller cavity and be discharged along the circumference of the gradually changing guide section. This helps reduce sudden airflow collisions and backflows, and converts some of the gas's kinetic energy into pressure energy, achieving a similar flow collection and pressurization effect to a traditional volute. Simultaneously, the distance between the outer guide surface and the inner wall of the delivery pipe gradually decreases. This causes the gradually changing guide section to form a gradually expanding flow channel on its inner side, while its outer contour gradually converges towards the axis of rotation. This allows for the formation of a volute-type guide structure without significantly increasing the radial dimensions of the fan module. Furthermore, the gradually changing guide section works in conjunction with the delivery pipe to guide the radially discharged gas from the impeller into the delivery pipe, improving the structural compactness of the fan module and the stability of gas delivery.

[0023] Optionally, the shielding cover has an annular flange extending radially outward at one end near the end cover, and the end cover is connected to a flange cover, which presses against the annular flange on the side away from the end cover. The end cap has at least one sealing ring groove for accommodating a sealing ring on the side facing the annular flange.

[0024] By adopting the above technical solution, the flange gland can press the annular flange of the shielding cover tightly against the end cover, thereby achieving a stable connection between the shielding cover and the end cover. The sealing ring set in the sealing ring groove can form a seal between the annular flange and the end cover, reducing the leakage of the transported gas from the connection between the shielding cover and the end cover. After the flange gland is removed, the compression on the annular flange can be released, which facilitates the installation, maintenance and replacement of the shielding cover and its internal magnetic components.

[0025] This application also provides a variable boost ratio adjustment system using the following technical solution. A variable boost ratio regulation system, using the aforementioned integrated fan module, includes a second motor, an external magnetic assembly, a switching drive assembly, and two integrated fan modules, wherein the impellers of the two integrated fan modules have different sizes; The external magnetic component is connected to the output end of the second motor, and the switching drive component is used to drive the second motor to move so that the external magnetic component is selectively magnetically coupled to the internal magnetic components of the two integrated fan modules.

[0026] By adopting the above technical solution, the switching drive component can move the second motor and the external magnetic component between the two integrated fan modules, allowing the external magnetic component to selectively couple with the internal magnetic component of one of the integrated fan modules. This enables the same second motor to selectively drive impellers of different sizes. Impellers of different sizes can adapt to different flow rates and pressure ratios during gas delivery. Therefore, there is no need to configure separate drive motors for different operating conditions; switching between different fan modules is possible. This expands the system's flow rate and pressure ratio adjustment range and reduces the number of drive devices and the space occupied by the equipment.

[0027] Optionally, the two integrated fan modules are arranged opposite each other, and the internal magnetic components of the two integrated fan modules are arranged facing each other; The second motor is a dual-output shaft motor and is located between the two integrated fan modules. There are two external magnetic components, which are respectively located at the two output ends of the dual-output shaft motor. The switching drive component includes a servo drive unit, which drives the motor to move along the arrangement direction of the two integrated fan modules, so that when one of the external magnetic components is magnetically coupled to the corresponding internal magnetic component, the other external magnetic component is decoupled from the corresponding internal magnetic component.

[0028] By adopting the above technical solution, a dual-output shaft motor is positioned between two integrated fan modules, and its two output terminals are connected to external magnetic components. When the second motor moves towards one of the integrated fan modules, the corresponding external magnetic component magnetically couples with the corresponding internal magnetic component, while the external magnetic component on the other side decouples from the corresponding internal magnetic component, thus achieving rapid switching between the two integrated fan modules. The two internal magnetic components are arranged facing each other, allowing the second motor to complete the switching simply by moving linearly along the arrangement direction of the two integrated fan modules, shortening the travel distance of the second motor and the external magnetic components. The servo drive can accurately control the movement position of the second motor, ensuring the axial and radial alignment between the external magnetic component and the corresponding internal magnetic component, improving the stability and reliability of magnetic coupling switching, and allowing the two integrated fan modules to share the same second motor, resulting in a more compact overall structure.

[0029] In summary, this application includes at least one of the following beneficial technical effects: 1. By sequentially connecting the conveying pipe, the air passage in the rotating shaft, the internal space of the shield, and the air chamber on the impeller inlet side, a continuous ventilation path can be formed under the suction action of the impeller. This allows the conveying gas to continuously replenish the internal space of the shield and carry away the heat of the inner magnetic components and the vicinity of the shield, reducing the retention of hot gas and local repeated circulation, and improving the stability of the magnetic drive structure operation. 2. The shaft, impeller, impeller housing, internal magnetic components, shielding cover, bearing support structure and flow regulation structure are all directly or indirectly integrated into the end cover. After the end cover is connected to the conveying pipeline, the overall installation of the fan module can be completed. When the end cover is removed, the relevant components can be removed as a whole, thereby improving the compactness of the fan structure and the convenience of installation, maintenance and replacement. 3. By setting up two integrated fan modules with different impeller sizes and using a switching drive component to move the motor and external magnetic component, the external magnetic component can be selectively magnetically coupled to the internal magnetic component of one of the integrated fan modules. This allows the same motor to selectively drive impellers of different specifications to adapt to different flow rates and pressure ratios, thereby expanding the system's operating condition adjustment range and reducing the number of drive devices and the space occupied by the equipment. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0031] Figure 2 This is a schematic diagram illustrating the structure of the flow regulation component in an embodiment of this application.

[0032] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle.

[0033] Figure 4 yes Figure 2 Enlarged diagram of part B.

[0034] Figure 5 This is a schematic diagram illustrating the structure of the annular adjustment plate in an embodiment of this application.

[0035] Figure 6 This is a schematic diagram illustrating the structure of the second motor and the external magnetic assembly in an embodiment of this application. Figure 7 This is a schematic diagram illustrating the structure of the second motor and the external magnetic assembly in an embodiment of this application.

[0036] Figure 8 This is a schematic diagram illustrating the structure of the switching drive component in an embodiment of this application.

[0037] Explanation of reference numerals in the attached drawings: 1. End cap; 11. Stepped hole; 12. First bearing; 13. Main intake channel; 14. Return channel; 15. Second flow channel; 16. Secondary intake channel; 17. Sealing ring groove; 2. Impeller housing; 21. Volute; 211. Gradient guide section; 2111. Outer guide surface; 2112. Inner guide surface; 22. Rear cover; 221. First intake port; 222. Second intake port; 223. Receiving groove; 224. Mounting port; 23. Front cover; 24. End cap; 241. Air supply hole; 25. Annular baffle; 26. Air chamber; 27. Impeller cavity; 2 8. Exhaust port; 29. ​​Second bearing; 3. Rotating shaft; 31. Air passage; 4. Impeller; 51. Inner magnetic assembly; 52. Shielding cover; 521. Annular flange; 53. Flange cover; 54. Hollow bolt; 6. Cover; 61. First flow channel; 62. Shoulder; 63. Third bearing; 7. Flow regulating assembly; 71. Annular regulating plate; 711. Driven gear; 712. First regulating port; 713. Second regulating port; 72. First motor; 73. Drive gear; 81. Second motor; 82. Outer magnetic assembly; 9. Switching drive assembly; 91. Servo drive component. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0039] This embodiment provides an integrated fan module and a variable boost ratio adjustment system using the integrated fan module.

[0040] like Figure 1 and Figure 2 The integrated fan module includes an end cover 1, an impeller housing 2, a rotating shaft 3, an impeller 4, an internal magnetic assembly 51, a shielding cover 52, and a pressure cap 6. The end cover 1 is detachably connected to the end of the conveying pipe. In this embodiment, the end cover 1 is connected to the end of the conveying pipe via a flange and bolts. A seal is provided between the end cover 1 and the conveying pipe to prevent leakage of the conveyed gas from the connection point. The end cover 1 is connected to the impeller housing 2, allowing the impeller housing 2, rotating shaft 3, impeller 4, internal magnetic assembly 51, and shielding cover 52 to be installed as a whole in the conveying pipe or removed from the conveying pipe.

[0041] The rotating shaft 3 is arranged along the axial direction of the conveying pipe, and its two ends are connected to the impeller 4 and the inner magnetic assembly 51, respectively. A shielding cover 52 is provided on the side of the end cover 1 facing away from the conveying pipe. The shielding cover 52 covers the outer periphery of the inner magnetic assembly 51, and a ventilation gap for gas flow is left between the inner magnetic assembly 51 and the inner wall of the shielding cover 52. The shielding cover 52 isolates the inner magnetic assembly 51 from the external drive structure, preventing the conveyed gas from directly contacting the external drive structure.

[0042] In this embodiment, the inner magnetic component 51 is sleeved on the end of the rotating shaft 3 near the shield 52. The inner magnetic component 51 has a connecting hole that extends axially along the rotating shaft 3. A hollow bolt 54 passes through the connecting hole and is threadedly connected to the rotating shaft 3 to axially press and fix the inner magnetic component 51 to the rotating shaft 3. The hollow bolt 54 has a through hole along its axial direction. One end of the through hole communicates with the ventilation channel 31 inside the rotating shaft 3, and the other end of the through hole communicates with the internal space of the shield 52, allowing the gas in the ventilation channel 31 to enter the internal space of the shield 52 through the hollow bolt 54. Thus, the hollow bolt 54 can both achieve a fixed connection between the inner magnetic component 51 and the rotating shaft 3 and form an extension of the ventilation channel 31, preventing the inner magnetic component 51 from obstructing the path of gas entering the internal space of the shield 52.

[0043] The impeller housing 2 includes a volute 21 and a rear cover 22 and a front cover 23 respectively connected to the two axial ends of the volute 21. The rear cover 22 is located at the end of the volute 21 closer to the end cover 1, and the front cover 23 is located at the end of the volute 21 away from the end cover 1. An annular baffle 25 is provided inside the volute 21, which divides the internal space of the volute 21 into an air chamber 26 and an impeller chamber 27 arranged sequentially along the axial direction of the rotating shaft 3. The air chamber 26 is located on the side of the annular baffle 25 closer to the rear cover 22, and the impeller chamber 27 is located on the side of the annular baffle 25 closer to the front cover 23.

[0044] An air extraction port 28 is formed on the inner circumference of the annular baffle 25, connecting the air chamber 26 and the impeller chamber 27. The rotating shaft 3 passes sequentially through the air chamber 26, the air extraction port 28, and the impeller chamber 27. The impeller 4 is located within the impeller chamber 27 and is fixedly connected to the rotating shaft 3. When the impeller 4 rotates, it draws gas from the air chamber 26, causing the gas to enter the impeller chamber 27 through the air extraction port 28, and then exit radially from the impeller 4.

[0045] like Figure 1 , Figure 2 and Figure 3 The end cap 1 has a stepped hole 11, through which the rotating shaft 3 passes. A first bearing 12 is installed inside the stepped hole 11, sleeved on the outer circumference of the rotating shaft 3. The outer ring of the first bearing 12 mates with the inner wall of the stepped hole 11, and the inner ring of the first bearing 12 mates with the rotating shaft 3. A pressure cap 6 is connected to the end cap 1 and extends into the stepped hole 11. The first bearing 12 is positioned axially along the rotating shaft 3 between the stepped surface of the stepped hole 11 and the pressure cap 6, so that the end of the rotating shaft 3 closest to the end cap 1 is rotatably supported on the end cap 1 by the first bearing 12.

[0046] One end of the rotating shaft 3, away from the rear cover 22, extends into the front cover 23. A second bearing 29 is fitted onto the end of the rotating shaft 3 extending into the front cover 23. The front cover 23 is connected to an end cap 24. The second bearing 29 is axially positioned between the front cover 23 and the end cap 24, so that the end of the rotating shaft 3 away from the end cover 1 is rotatably supported on the front cover 23 by the second bearing 29. By supporting both ends of the rotating shaft 3 with the first bearing 12 and the second bearing 29 respectively, the stability of the rotating shaft 3 and the impeller 4 during high-speed rotation can be improved.

[0047] The end cover 1 has a main air intake channel 13, and the rear cover 22 has a first air inlet 221 that communicates with the air chamber 26. The main air intake channel 13 is connected to the air chamber 26 through the first air inlet 221. The conveying gas can continuously enter the air chamber 26 from the main air intake channel 13 through the first air inlet 221, and under the suction action of the impeller 4, it enters the impeller chamber 27 through the suction port 28. Then, it is pressurized by the impeller 4 and discharged into the conveying pipeline.

[0048] An air passage 31 extending axially is provided inside the rotating shaft 3. The air inlet of the air passage 31 is located at the end of the rotating shaft 3 near the end cap 24, and the air outlet of the air passage 31 is located at the end of the rotating shaft 3 near the inner magnetic assembly 51. An air replenishment hole 241 is provided on the end cap 24, and an air replenishment space communicating with the air replenishment hole 241 is formed between the end cap 24 and the end of the rotating shaft 3. The air inlet of the air passage 31 is connected to the air replenishment space. Since the end cap 24 is located inside the conveying pipe, part of the gas in the conveying pipe can enter the internal space of the shield 52 in sequence through the air replenishment hole 241, the air replenishment space, and the air passage 31.

[0049] The pressure cap 6 is fitted onto the outer circumference of the rotating shaft 3. An annular gap is left between the inner circumferential surface of the pressure cap 6 and the outer circumferential surface of the rotating shaft 3, forming a return channel 14 that communicates with the air chamber 26. Several first flow channels 61 are formed inside the pressure cap 6, and several second flow channels 15 are formed inside the end cap 1. The several first flow channels 61 and several second flow channels 15 are connected in a one-to-one correspondence. One end of the first flow channel 61 is connected to the return channel 14, and the other end of the first flow channel 61 is connected to the corresponding second flow channel 15. The end of the second flow channel 15 away from the first flow channel 61 is connected to the internal space of the shield 52.

[0050] Thus, the internal space of the shield 52 is connected to the air chamber 26 sequentially through the second flow channel 15, the first flow channel 61, and the return channel 14. When the impeller 4 continuously draws in the gas from the air chamber 26, the gas is discharged to the shield 52 via the end of the rotating shaft 3, then passes through the space between the inner magnetic component 51 and the shield 52, and then sequentially passes through the second flow channel 15, the first flow channel 61, and the return channel 14 to replenish the air chamber 26, thereby reducing the pressure inside the shield 52. The gas in the conveying pipe is then continuously replenished into the internal space of the shield 52 through the air replenishment hole 241, the air replenishment space, and the air passage 31 within the rotating shaft 3, thus forming the following continuous ventilation path: The gas in the conveying pipeline passes through the air inlet 241, the air passage 31, the internal space of the shield 52, the second flow channel 15, the first flow channel 61 and the return channel 14 in sequence before entering the gas chamber 26. Then, it is drawn in by the impeller 4 and discharged back into the conveying pipeline.

[0051] During this process, the gas replenishing the internal space of the shield 52 flows through the ventilation gap between the inner magnetic component 51 and the inner wall of the shield 52, which can carry away the heat generated near the inner magnetic component 51 and the shield 52. Compared with the gas circulating locally near the inner magnetic component 51, this embodiment can continuously replenish the internal space of the shield 52 with new delivery gas and draw the gas after heat exchange into the gas chamber 26, thereby reducing the retention or repeated circulation of hot gas in the internal space of the shield 52.

[0052] The rear cover 22 is also provided with a second air inlet 222 that communicates with the air chamber 26, and the end cover 1 is provided with a secondary air inlet channel 16. One end of the secondary air inlet channel 16 is connected to the air chamber 26 through the second air inlet 222, and the other end of the secondary air inlet channel 16 is connected to the return pipe. The end of the return pipe away from the secondary air inlet channel 16 is connected to the exhaust end of the conveying pipe, so that part of the gas at the exhaust end of the conveying pipe can re-enter the air chamber 26 through the return pipe, the secondary air inlet channel 16 and the second air inlet 222 in sequence, thereby forming a return air supply path from the exhaust end of the conveying pipe back to the intake side of the impeller 4.

[0053] like Figure 2 , Figure 4 and Figure 5 The integrated fan module also includes a flow regulation component 7, which is used to adjust the flow area of ​​the first air inlet 221 and the second air inlet 222. In this embodiment, the rear cover 22 and the end cover 1 are spaced apart along the axial direction of the rotating shaft 3. The rear cover 22 has a receiving groove 223 surrounding the rotating shaft 3 on the side facing the end cover 1. One end of the pressure cap 6 extends into the mounting opening 224 on the rear cover 22. The receiving groove 223, the pressure cap 6, and the end cover 1 together form an installation space.

[0054] The outer periphery of the pressure cap 6 is provided with a shoulder 62, and a third bearing 63 is sleeved on the outer periphery of the pressure cap 6. The third bearing 63 is axially positioned between the rear cover 22 and the shoulder 62 along the rotating shaft 3. The flow regulating assembly 7 includes an annular regulating plate 71, which is sleeved on the outer periphery of the third bearing 63 so that the annular regulating plate 71 is rotatably supported on the pressure cap 6 by the third bearing 63 and can rotate relative to the end cover 1 and the rear cover 22.

[0055] The annular adjusting plate 71 has a driven toothed portion 711 on its outer periphery. A first motor 72 is mounted on the end cover 1, and the output end of the first motor 72 is connected to a driving gear 73. The driving gear 73 meshes with the driven toothed portion 711 on the outer periphery of the annular adjusting plate 71. When the first motor 72 drives the driving gear 73 to rotate, the driving gear 73 drives the annular adjusting plate 71 to rotate around the rotating shaft 3 through the driven toothed portion 711.

[0056] The annular adjusting plate 71 has a first adjusting port 712 and a second adjusting port 713. The first adjusting port 712 corresponds to the first air inlet 221, and the second adjusting port 713 corresponds to the second air inlet 222. The first adjusting port 712 and the second adjusting port 713 are arranged circumferentially offset along the annular adjusting plate 71, and the adjusting sides used to control the flow area are located on opposite circumferential sides of the corresponding air inlets. Therefore, when the annular adjusting plate 71 rotates, the overlapping area of ​​the first adjusting port 712 and the first air inlet 221 increases, and the overlapping area of ​​the second adjusting port 713 and the second air inlet 222 decreases accordingly; or, the overlapping area of ​​the first adjusting port 712 and the first air inlet 221 decreases, and the overlapping area of ​​the second adjusting port 713 and the second air inlet 222 increases accordingly.

[0057] Therefore, the flow area of ​​the main intake channel 13 and the auxiliary intake channel 16 supplying gas to the air chamber 26 can be changed simultaneously by a ring-shaped regulating plate 71. When the external required flow rate is large, the flow area of ​​the first intake port 221 can be increased and the flow area of ​​the second intake port 222 can be decreased, so that more gas enters the air chamber 26 from the main intake channel 13; when the external required flow rate is small, the flow area of ​​the first intake port 221 can be decreased and the flow area of ​​the second intake port 222 can be increased, so that part of the gas at the exhaust end of the delivery pipe re-enters the air chamber 26 through the return pipe, thereby reducing the net output flow rate of the system while maintaining the required gas flow rate inside the impeller 4.

[0058] like Figure 1 The volute 21 has a gradually increasing guide section 211 surrounding the impeller 4. The gradually increasing guide section 211 has an inner guide surface 2112 facing the impeller 4 and an outer guide surface 2111 facing the inner wall of the conveying pipe. Along the rotation direction of the impeller 4, the first distance between the inner guide surface 2112 and the outer edge of the impeller 4 gradually increases, so that the gas radially discharged from the impeller 4 can be collected in the gradually expanding impeller cavity 27.

[0059] Meanwhile, along the rotation direction of the impeller 4, the second distance between the outer guide surface 2111 and the inner wall of the conveying pipe gradually decreases. In other words, while the gradually changing guide section 211 moves away from the impeller 4 on its inner side, its outer side gradually retracts towards the axis of the rotating shaft 3. The circumferential region with a larger first distance corresponds to the circumferential region with a smaller second distance, and the circumferential region with a smaller first distance corresponds to the circumferential region with a larger second distance.

[0060] With the above structure, the inner side of the gradually expanding flow collection space of the gradually expanding flow guide 211 is formed, similar to that of a conventional volute 21, while the outer side of the gradually expanding flow guide 211 gradually narrows to fit the circular inner wall of the conveying pipe. The gas radially discharged from the impeller 4 is discharged into the conveying pipe through the circumference of the gradually expanding flow guide 211, and gradually transforms into an airflow flowing along the axial direction of the conveying pipe under the constraint and guidance of the conveying pipe. Thus, the volute 21-type flow collection and guiding effect can be formed without significantly increasing the radial dimension of the fan module.

[0061] like Figure 3 The shield 52 has an annular flange 521 extending radially outward at one end near the end cap 1. The end cap 1 is connected to a flange cover 53 surrounding the shield 52 on the side opposite to the conveying pipe. The flange cover 53 presses against the side of the annular flange 521 opposite to the end cap 1, pressing the annular flange 521 tightly between the flange cover 53 and the end cap 1.

[0062] At least one sealing ring groove 17 is provided on the side of the end cap 1 facing the annular flange 521. A sealing ring is installed in the sealing ring groove 17, and the sealing ring seals against the annular flange 521. When the flange cover 53 applies an axial clamping force to the annular flange 521, the sealing ring is compressed between the annular flange 521 and the end cap 1 to achieve a seal at the connection between the shield 52 and the end cap 1. After removing the flange cover 53, the clamping force on the annular flange 521 can be released, so that the shield 52 can be removed and the inner magnetic assembly 51 can be inspected or replaced.

[0063] like Figure 6 and Figure 8 This embodiment also provides a variable boost ratio adjustment system. The system includes two integrated fan modules as described above, a second motor 81, two external magnetic components 82, and a switching drive component 9. The two integrated fan modules are arranged opposite each other and spaced apart, with their internal magnetic components 51 facing each other. The two integrated fan modules are designed for different gas delivery conditions; one integrated fan module is used for low boost ratio and high flow rate conditions, while the other is used for high boost ratio and low flow rate conditions. The two integrated fan modules use impellers 4 of different sizes.

[0064] The second motor 81 is a dual-output shaft motor and is located between the two integrated fan modules. Two external magnetic components 82 are respectively connected to the two output ends of the second motor 81. Each external magnetic component 82 can move to the outer periphery of the corresponding shield 52 and form magnetic coupling with the internal magnetic component 51 inside the shield 52.

[0065] The switching drive assembly 9 includes a frame, guide rail, movable seat, lead screw, and servo drive 91. The guide rail is mounted on the frame along the arrangement direction of the two integrated fan modules. The movable seat is slidably connected to the guide rail, and the second motor 81 is fixedly mounted on the movable seat. The lead screw is rotatably connected to the frame and threadedly engaged with the movable seat. The servo drive 91 is connected to the lead screw via a transmission connection.

[0066] When the servo drive 91 drives the lead screw to rotate, the moving base drives the second motor 81 and the two external magnetic components 82 to move along the arrangement direction of the two integrated fan modules. When the second motor 81 moves toward one of the integrated fan modules, the external magnetic component 82 close to that integrated fan module moves to the outer periphery of the corresponding shield 52 and forms magnetic coupling with the internal magnetic component 51 of that integrated fan module; at the same time, the external magnetic component 82 at the other output end of the second motor 81 moves away from the internal magnetic component 51 of the other integrated fan module and decouples from magnetic coupling.

[0067] When the second motor 81 moves in the reverse direction, the outer magnetic component 82, which was previously in a magnetically coupled state, is decoupled from the corresponding inner magnetic component 51, while the other outer magnetic component 82 forms a magnetic coupling with the inner magnetic component 51 of the other integrated fan module. Therefore, the second motor 81 can selectively drive one of the two integrated fan modules, enabling the system to switch between low boost ratio, high flow rate conditions and high boost ratio, low flow rate conditions.

[0068] In actual operation, the appropriate integrated fan module is selected based on the required gas flow rate and pressure ratio. The switching drive component 9 first drives the second motor 81 to move to the position corresponding to the target integrated fan module, causing the corresponding external magnetic component 82 to form magnetic coupling with the internal magnetic component 51 of the target integrated fan module. After the second motor 81 starts, it drives the rotating shaft 3 and impeller 4 to rotate through the magnetic coupling between the external magnetic component 82 and the internal magnetic component 51.

[0069] After the impeller 4 rotates, the gas in the main intake channel 13 enters the air chamber 26 through the first intake port 221, then enters the impeller chamber 27 through the exhaust port 28, and is discharged into the conveying pipe by the impeller 4. At the same time, part of the gas in the conveying pipe enters the air chamber 26 sequentially through the replenishment port 241, the air passage 31, the internal space of the shield 52, the second flow channel 15, the first flow channel 61, and the return channel 14, thereby continuously ventilating and cooling the internal magnetic component 51 and the shield 52. The first motor 72 can also adjust the position of the annular regulating plate 71 according to the actual net output flow requirements, changing the ratio between the main intake volume and the return flow volume, so that the integrated fan module can maintain stable operation within the corresponding flow range.

[0070] Reference Figure 6In other embodiments, both integrated fan modules can employ a single air intake structure. Specifically, each integrated fan module can only have a main air intake channel 13 and a first air intake port 221. The main air intake channel 13 is connected to the air chamber 26 through the first air intake port 221, so that gas enters the air chamber 26 through the main air intake channel 13 and the first air intake port 221, and is then drawn in by the impeller 4 and discharged into the delivery pipeline. In this embodiment, the integrated fan module may not have a second air intake port 222, an auxiliary air intake channel 16, or a flow regulation component 7, i.e., there is no return air supply path from the exhaust end of the delivery pipeline to the air chamber 26, and no linkage regulation between the main air intake volume and the return air volume. The two integrated fan modules form different flow rates and pressure ratios through impellers 4 of different sizes. The switching drive component 9 drives the second motor 81 and the external magnetic component 82 to move, so as to select one of the integrated fan modules to operate, thereby still achieving switching between different flow rate and pressure ratio operating conditions.

[0071] It should be noted that the end cover 1 and the impeller housing 2 are not necessarily directly fixedly connected. In the above embodiments, the impeller housing 2 is directly or indirectly connected to the end cover 1 so that the impeller housing 2 can be assembled and disassembled as a whole with the end cover 1. In other embodiments, the end cover 1 and the impeller housing 2 can also be connected to the conveying pipeline respectively, or the end cover 1 and the end of the conveying pipeline can jointly clamp the impeller housing 2, thereby defining the position of the impeller housing 2 relative to the end cover 1 and the conveying pipeline. A positioning boss, positioning groove, connecting sleeve, support rod or other intermediate connection structure can also be provided between the end cover 1 and the impeller housing 2. As long as the impeller housing 2 can maintain a predetermined position relative to the end cover 1 and the conveying pipeline after the fan module is installed, the usage requirements can be met.

[0072] In the above embodiments, the rotating shaft 3 is rotatably supported on the end cover 1 and the front cover 23 by the first bearing 12 and the second bearing 29, respectively. In other embodiments, the rotating shaft 3 may also have two spaced bearings at only one end of the impeller housing 2, or it may be rotatably connected to the impeller housing 2 by bearing seats, support sleeves, sliding bearings, oil-impregnated bushings, and other rotating support structures. The number, type, and installation position of the bearings can be adjusted according to the length of the rotating shaft 3, the size of the impeller 4, and the operating speed, and are not limited to the two-end support structure shown in this embodiment.

[0073] The main air intake channel 13 provided on the end cover 1 can be a channel penetrating the end cover 1, or it can be formed by a groove on the end cover 1 and the adjacent surfaces of the cover plate, impeller housing 2, or conveying pipe. The main air intake channel 13 can also be connected to an external air source through an air intake connector, air intake pipe, or connecting sleeve installed on the end cover 1. The first air intake port 221 does not necessarily have to be located on the rear cover 22; it can also be located on the volute 21, the annular partition 25, or other housing parts that communicate with the air chamber 26, as long as the main air intake channel 13 can deliver gas to the air chamber 26 through the first air intake port 221.

[0074] In the above embodiments, the air passage 31 extends axially along the shaft 3 to the end of the shaft 3 near the end cap 24, and is connected to the conveying pipeline through the air inlet hole 241 on the end cap 24. In other embodiments, the end cap 24 may not be provided, and the end of the shaft 3 near the impeller 4 may directly extend into the conveying pipeline, with the air inlet end of the air passage 31 directly opened on the end face of the shaft 3. The air inlet end of the air passage 31 may also be opened on the outer circumferential surface of the shaft 3, and is connected to the conveying pipeline through an annular air intake space formed by the front cover 23, bearing seat, or other fixed components. The air inlet end of the air passage 31 may also include an axial hole, a radial hole, an oblique hole, or a combination of the above-mentioned holes, and is not limited to axial air intake on the end face.

[0075] In the above embodiments, the exhaust end of the air passage 31 extends to the end face of the rotating shaft 3 connected to the inner magnetic component 51, so that gas enters the internal space of the shield 52 from the end of the rotating shaft 3. In other embodiments, when the end of the rotating shaft 3 is supported on the shield 52 by a bearing, support sleeve, or other structure, the exhaust end of the air passage 31 can be opened on the outer peripheral surface of the rotating shaft 3 located inside the shield 52, or communicate with the internal space of the shield 52 through radial holes or oblique holes. The air passage 31 can also be provided with multiple exhaust ends, so that gas is discharged from one end of the inner magnetic component 51 or dispersed into the internal space of the shield 52 along the circumference of the inner magnetic component 51.

[0076] In the above embodiments, the internal space of the shield 52 is connected to the air chamber 26 sequentially through the second flow channel 15 in the end cap 1, the first flow channel 61 in the pressure cap 6, and the return channel 14 between the pressure cap 6 and the rotating shaft 3. In other embodiments, the internal space of the shield 52 and the air chamber 26 can be directly connected through one or more flow channels formed on the end cap 1, the impeller housing 2, the pressure cap 6, or the shield 52, or through connecting pipes, annular cavities, or through holes provided between the above components. For example, in embodiments where no bearing or pressure cap 6 is provided between the rotating shaft 3 and the impeller housing 2, a through flow channel connecting the internal space of the shield 52 and the air chamber 26 can be directly formed on the end cap 1 or the impeller housing 2, without the need for the structure in which the first flow channel 61, the second flow channel 15, and the return channel 14 are sequentially connected.

[0077] In the above embodiment, the pressure cap 6 extends into the stepped hole 11 of the end cap 1 and, together with the stepped surface of the stepped hole 11, axially limits the first bearing 12. The pressure cap 6 can be fixed to the end cap 1 by bolts, threads, retaining rings, pressure plates, or other detachable connection methods, or it can be integrally formed with the end cap 1. The pressure cap 6 can be an integral ring structure, or it can be formed by assembling two or more separate parts.

[0078] The return channel 14 between the pressure cap 6 and the rotating shaft 3 can be a continuous annular gap, or it can be formed by one or more axial grooves formed on the inner circumferential surface of the pressure cap 6 or the outer circumferential surface of the rotating shaft 3. One or more first flow channels 61 and second flow channels 15 can be provided respectively, and can be axial holes, radial holes, oblique holes, arc-shaped holes, or annular grooves. Multiple first flow channels 61 and multiple second flow channels 15 can be connected one-to-one, or they can be connected together through an annular confluence groove provided between the pressure cap 6 and the end cap 1. Therefore, the number, shape, and correspondence of the first flow channels 61 and the second flow channels 15 are not limited by the above embodiments.

[0079] The return pipe connected to the secondary intake passage 16 can be connected to the exhaust end of the conveying pipeline, or to other locations downstream of the impeller 4 exhaust side, as long as it can redirect some of the gas discharged from the impeller 4 back to the gas chamber 26. The return pipe can be an independent pipe located outside the conveying pipeline, or it can be a built-in flow channel formed in the pipe wall of the conveying pipeline, the equipment housing, or the mounting base.

[0080] In the above embodiments, the first air inlet 221 and the second air inlet 222 are linked and adjusted through the same annular adjusting plate 71. In other embodiments, the flow regulating component 7 may include two independent control valves respectively corresponding to the first air inlet 221 and the second air inlet 222. The two independent control valves may be solenoid valves, electric valves, pneumatic valves, butterfly valves, gate valves, or other flow regulating structures. The two control valves can be controlled independently, or they can be controlled synchronously or in reverse linkage according to a preset control program. Therefore, the flow regulating component 7 is not limited to the flow areas of the two air inlets always changing in opposite directions.

[0081] In the embodiment employing the annular adjusting plate 71, the first adjusting port 712 and the second adjusting port 713 can be circular holes, arc-shaped holes, fan-shaped holes, waist-shaped holes, or windows of other shapes. Through the matching of their shapes, circumferential positions, and the orientation of their adjusting edges, the two adjusting ports cause the overlapping area of ​​the first adjusting port 712 and the first air inlet 221 to increase, while the overlapping area of ​​the second adjusting port 713 and the second air inlet 222 decreases, when the annular adjusting plate 71 rotates. The driven teeth 711 on the outer periphery of the annular adjusting plate 71 can be provided along its entire outer periphery or only on a portion of its outer periphery; the driven teeth 711 can also be formed by an independent toothed ring fixed to the outer periphery of the annular adjusting plate 71.

[0082] The installation space between the impeller housing 2 and the end cover 1 can be formed directly by the two spaced axially, or it can be formed by the receiving groove 223, clearance groove, annular groove, or spacer provided on the end cover 1 or the impeller housing 2. The annular adjusting plate 71 can be set in the installation space by a rolling bearing, sliding bearing, bushing, turntable bearing, or other rotating support structure, and is not limited to being sleeved on the outer periphery of the third bearing 63.

[0083] In the above embodiments, the impeller housing 2 is formed by connecting the volute 21, the front cover 23, and the rear cover 22 after they have been machined separately. In other embodiments, at least two of the volute 21, the front cover 23, and the rear cover 22 can be integrally formed, or the impeller housing 2 can be integrally formed by casting, injection molding, welding, or additive manufacturing. The annular baffle 25 can be integrally formed with the volute 21, or it can be installed as an independent component inside the volute 21.

[0084] The second bearing 29 can be directly installed in the front cover 23, or it can be installed on the front cover 23 through a bearing housing, mounting sleeve, or support sleeve. The end cap 24 can be fixed to the front cover 23 by threaded connection, bolt connection, snap-fit ​​connection, or compression connection. The end cap 24 is not a necessary structure; the air passage 31 of the rotating shaft 3 can be directly connected to the conveying pipe through the opening on the end face or outer circumference of the rotating shaft 3.

[0085] In the above embodiment, the inner ring of the third bearing 63 is fitted around the outer periphery of the pressure cover 6, and the annular adjusting plate 71 is fitted around the outer ring of the third bearing 63, so that the pressure cover 6 simultaneously serves as a limiting component of the first bearing 12 and a rotational support base for the annular adjusting plate 71. In other embodiments, the annular adjusting plate 71 can also be rotatably supported on the end cover 1, the rear cover 22, or an independently provided annular support seat; its axial limiting can be achieved by the shoulder 62, the retaining ring, the pressure ring, the cover plate, or the mounting groove.

[0086] The gradual flow guide section 211 does not need to form a completely independent and enclosed volute 21 as in traditional fans. The inner flow guide surface 2112 of the gradual flow guide section 211 and the outer edge of the impeller 4 together define a gradual flow collection space, and the outer flow guide surface 2111 of the gradual flow guide section 211 forms a correspondingly changing outer space with the inner wall of the conveying pipe, so that the impeller housing 2 can be set inside the conveying pipe, and the inner wall of the conveying pipe participates in defining the flow space after the gas is discharged.

[0087] The distance between the inner guide surface 2112 and the outer edge of the impeller 4, and the distance between the outer guide surface 2111 and the inner wall of the conveying pipe, can change continuously and smoothly, or they can form an approximately gradual relationship by multiple successively changing curved sections, inclined sections, or stepped sections. The outer guide surface 2111 and the inner wall of the conveying pipe can always maintain a gap, or they can be close to or abut against each other in some circumferential areas. As long as the overall flow collection space outside the impeller 4 increases along the rotation direction of the impeller 4, and the outer contour of the gradually changing guide section 211 is adapted to the internal space of the conveying pipe, a flow collection and guiding function similar to that of the volute 21 can be achieved.

[0088] In the above embodiments, the flange cover 53 fixes the shielding cover 52 to the end cover 1 by pressing against the annular flange 521 of the shielding cover 52. In other embodiments, the shielding cover 52 can also be fixed to the end cover 1 by threaded connection, snap ring connection, clamp connection, direct bolt connection or other detachable connection methods. The flange cover 53 can be a complete annular structure or it can be composed of multiple arc-shaped pressure plates.

[0089] The sealing ring groove 17 can be provided on the end cover 1, or on the annular flange 521, flange gland 53, or the opposite surface of the above components. One or more sealing ring grooves 17 can be provided, and the sealing element can be an O-ring, a flat gasket, a lip seal, or other sealing structures suitable for the corresponding conveying medium.

[0090] The two integrated fan modules have different impeller dimensions, meaning that at least one of the following is different: outer diameter, axial width, blade height, or flow channel dimensions. The two impellers 4 can also have different numbers of blades, blade angles, or other aerodynamic parameters to adapt to different flow rate and pressure ratio conditions.

[0091] The two integrated fan modules can be set relative to each other, side by side, or at an angle. The switching drive component 9 can drive the second motor 81 to move linearly, arc, swing, or in combination, as long as the outer magnetic component 82 can be selectively moved to a magnetic coupling position corresponding to one of the inner magnetic components 51.

[0092] The switching drive assembly 9 can employ either an electrically operated switching structure or a manually operated switching structure where force is applied by the operator. In other embodiments, the switching drive assembly 9 includes a guide structure arranged along the arrangement direction of the two integrated fan modules, a movable seat slidably disposed on the guide structure, an operating component connected to the movable seat, and a positioning locking component for locking the position of the movable seat. A second motor 81 is mounted on the movable seat. The operator pushes or pulls the operating component, causing the movable seat to move, driving the second motor 81 and the external magnetic assembly 82. When the external magnetic assembly 82 moves to a magnetic coupling position corresponding to one of the internal magnetic assemblies 51, the positioning locking component locks the movable seat, thereby keeping the second motor 81 in the corresponding working position. The operating component can be a handle, a lever, or a handwheel, and the positioning locking component can be a positioning pin, a locking bolt, a spring pin, or an eccentric clamping component. When a handwheel is used, the handwheel can also drive the movable seat to move via a lead screw and nut pair.

[0093] One external magnetic component 82 can be provided, driven by the second motor 81 to switch between the two internal magnetic components 51; alternatively, two external magnetic components 82 can be provided, each connected to a different output terminal of the second motor 81. The external magnetic component 82 and the internal magnetic component 51 can adopt a radially nested magnetic coupling structure or an axially opposite magnetic coupling structure. They are isolated by a shield 52 or other isolation components, and no mechanical contact is required.

[0094] "Decoupling the external magnetic assembly 82 from the internal magnetic assembly 51" does not require the complete absence of magnetic force between them, but rather that the distance or relative position between them is such that they cannot transmit sufficient torque to the corresponding rotating shaft 3 to drive the impeller 4. During the switching process, there may also be an intermediate position where neither of the two external magnetic assemblies 82 has formed an effective magnetic coupling with the corresponding internal magnetic assembly 51.

[0095] In the above embodiment, the second motor 81 is a dual-output shaft motor, and the two external magnetic components 82 are directly connected to the two output terminals respectively. In other embodiments, the external magnetic components 82 can also be connected to the output terminals of the second motor 81 through a coupling, connecting shaft, reduction mechanism or other transmission components.

[0096] The servo drive 91 can be a linear drive structure using a servo motor and a lead screw, or it can be a servo cylinder, a linear motor, a rack and pinion drive mechanism, or a synchronous belt drive mechanism. The second motor 81 can be fixed to a movable base, which is guided by a guide rail, slide rail, or roller structure. Preferably, the two integrated fan modules are coaxially opposite each other, so that the second motor 81 can move linearly to complete the switching between the two working positions; in other embodiments, the axes of the two modules can also be parallel or at a predetermined angle, and magnetic coupling switching can be completed through corresponding moving or turning mechanisms.

[0097] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An integrated fan module, characterized in that: It includes an end cap (1) and an impeller housing (2), the end cap (1) being able to be connected to the end of the conveying pipe, and the end cap (1) being rotatably connected to a rotating shaft (3); The two ends of the rotating shaft (3) are respectively connected to an impeller (4) and an inner magnetic assembly (51). The end cover (1) is provided with a shield (52) on the side away from the conveying pipe. The shield (52) covers the outer periphery of the inner magnetic assembly (51). The rotating shaft (3) is rotatably connected to the impeller housing (2); The end cap (1) has a main air intake channel (13), the impeller housing (2) has an air chamber (26), the impeller housing (2) has a first air inlet (221), and the main air intake channel (13) is connected to the air chamber (26) through the first air inlet (221). The impeller (4) can draw gas from the gas chamber (26) and discharge it from the impeller housing (2); The rotating shaft (3) has an air passage (31), the air inlet of the air passage (31) is connected to the conveying pipe, the exhaust end of the air passage (31) is connected to the internal space of the shield (52), and the internal space of the shield (52) is connected to the air cavity (26).

2. The integrated fan module according to claim 1, characterized in that: It also includes a pressure cap (6), the end cap (1) has a stepped hole (11), the rotating shaft (3) passes through the stepped hole (11), and a first bearing (12) is provided in the stepped hole (11) and sleeved on the outer periphery of the rotating shaft (3); The pressure cap (6) is connected to the end cap (1) and extends into the stepped hole (11). The first bearing (12) is located between the stepped surface of the stepped hole (11) and the pressure cap (6) along the axial direction of the rotating shaft (3). The pressure cap (6) is sleeved on the outer periphery of the rotating shaft (3), and a return channel (14) communicating with the air cavity (26) is formed between the inner peripheral surface of the pressure cap (6) and the outer peripheral surface of the rotating shaft (3); The pressure cap (6) has at least one first flow channel (61), and the end cap (1) has at least one second flow channel (15). One end of the first flow channel (61) is connected to the return channel (14), and the other end of the first flow channel (61) is connected to the second flow channel (15). The end of the second flow channel (15) away from the first flow channel (61) is connected to the internal space of the shield (52).

3. The integrated fan module according to claim 2, characterized in that: The impeller housing (2) has a second air inlet (222) that communicates with the air chamber (26), and the end cover (1) has a secondary air inlet channel (16) that is used to communicate with the return pipe at the exhaust end of the conveying pipe. The secondary air inlet channel (16) is connected to the air chamber (26) through the second air inlet (222). It also includes a flow regulating component (7), which is capable of adjusting the flow area of ​​the first air inlet (221) and the second air inlet (222).

4. The integrated fan module according to claim 3, characterized in that: The impeller housing (2) and the end cover (1) are spaced apart along the axial direction of the rotating shaft (3) and together form an installation space; The flow regulating component (7) includes an annular regulating plate (71), which is rotatably disposed in the installation space and sleeved on the outer periphery of the rotating shaft (3). The outer periphery of the annular regulating plate (71) is provided with a driven tooth (711). The end cap (1) is equipped with a first motor (72), and the output end of the first motor (72) is connected to a drive gear (73), which meshes with the driven gear (711). The annular adjustment plate (71) has a first adjustment port (712) and a second adjustment port (713). When the annular adjustment plate (71) rotates, the overlapping area of ​​the first adjustment port (712) and the first air inlet (221) increases, and the overlapping area of ​​the second adjustment port (713) and the second air inlet (222) decreases.

5. The integrated fan module according to claim 4, characterized in that: The impeller housing (2) includes a volute (21) and a rear cover (22) and a front cover (23) respectively connected to the two axial ends of the volute (21). An annular partition (25) is provided inside the volute (21). The annular partition (25) divides the internal space of the volute (21) into an air chamber (26) and an impeller chamber (27) arranged along the axial direction of the rotating shaft (3). The air chamber (26) is located on the side of the annular partition (25) closer to the rear cover (22), and the impeller chamber (27) is located on the side of the annular partition (25) closer to the front cover (23). The first air inlet (221) and the second air inlet (222) are both opened on the rear cover (22). The inner circumference of the annular partition (25) forms an air extraction port (28) that connects the air chamber (26) and the impeller chamber (27). The rotating shaft (3) passes through the air chamber (26) and the air extraction port (28) and extends into the impeller chamber (27). The impeller (4) is disposed in the impeller chamber (27). The end of the rotating shaft (3) away from the rear cover (22) extends into the front cover (23), and a second bearing (29) is sleeved on the end of the rotating shaft (3) that extends into the front cover (23); The front cover (23) is connected to an end cap (24). The second bearing (29) is positioned between the front cover (23) and the end cap (24) along the axial direction of the rotating shaft (3). The end cap (24) has an air inlet (241) through which gas can enter the air passage (31).

6. The integrated fan module according to claim 5, characterized in that: The rear cover (22) has an installation opening (224), and one end of the pressure cap (6) extends into the installation opening (224); The outer periphery of the pressure cap (6) is provided with a shoulder (62), and the rear cover (22) is provided with a receiving groove (223) on the side facing the end cover (1). The receiving groove (223), the pressure cap (6) and the end cover (1) together form the installation space. The outer periphery of the pressure cap (6) is fitted with a third bearing (63), which is located between the rear cover (22) and the shoulder (62) along the axial direction of the rotating shaft (3). The annular adjusting plate (71) is fitted around the outer periphery of the third bearing (63).

7. The integrated fan module according to claim 5, characterized in that: The volute (21) has a gradient guide section (211) arranged around the impeller (4). The gradient guide section (211) has an inner guide surface (2112) facing the impeller (4) and an outer guide surface (2111) facing the inner wall of the conveying pipe. Along the rotation direction of the impeller (4), the distance between the inner guide surface (2112) and the outer edge of the impeller (4) gradually increases, and the distance between the outer guide surface (2111) and the inner wall of the conveying pipe gradually decreases. Gas is discharged from the circumference of the gradient guide section (211).

8. The integrated fan module according to claim 5, characterized in that: The shield (52) has an annular flange (521) extending radially outward at one end near the end cap (1). The end cap (1) is connected to a flange cover (53), which presses against the side of the annular flange (521) away from the end cap (1). The end cap (1) has at least one sealing ring groove (17) for accommodating a sealing ring on the side facing the annular flange (521).

9. A variable boost ratio regulation system, characterized in that: The integrated fan module according to any one of claims 1-8 includes a second motor (81), an external magnetic assembly (82), a switching drive assembly (9), and two integrated fan modules, wherein the impellers (4) of the two integrated fan modules have different sizes; The external magnetic component (82) is connected to the output end of the second motor (81), and the switching drive component (9) is used to drive the second motor (81) to move so that the external magnetic component (82) is selectively magnetically coupled to the internal magnetic components (51) of the two integrated fan modules.

10. The variable boost ratio adjustment system according to claim 9, characterized in that: The two integrated fan modules are arranged opposite each other, and the internal magnetic components (51) of the two integrated fan modules are arranged facing each other; The second motor (81) is a dual-output shaft motor and is located between the two integrated fan modules. There are two external magnetic components (82), which are respectively located at the two output ends of the dual-output shaft motor. The switching drive component (9) includes a servo drive (91) for driving the second motor (81) to move along the arrangement direction of the two integrated fan modules, so that when one of the external magnetic components (82) is magnetically coupled to the corresponding internal magnetic component (51), the other external magnetic component (82) is decoupled from the corresponding internal magnetic component (51).

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