Fan blade pressurized air outlet device

Abstract

The utility model relates to fan equipment technical field, especially a fan blade pressurization air outlet equipment, the utility model provides a fan blade pressurization air outlet equipment, which comprises first fan blade, second fan blade, drive part and air outlet cylinder, first fan blade, second fan blade and drive part are all arranged in the air outlet cylinder, first fan blade includes inner hub, outer hub, at least two first blades and at least two second blades, the outer hub is coaxial with the inner hub and is set on the outer periphery of the inner hub, the second channel is formed between the inner hub and the outer hub, the first channel is formed between the outer hub and the air outlet cylinder, at least two first blades are located in the first channel and are spaced apart and connected to the outer periphery of the outer hub, at least two second blades are spaced apart and arranged in the second channel and are connected to the outer hub and the inner hub, the utility model relates to fan equipment technical field, especially a fan blade pressurization air outlet equipment, the utility model provides a fan blade pressurization air outlet equipment, which comprises first fan blade, second fan blade, drive part and air outlet cylinder, first fan blade, second fan blade and drive part are all arranged in the air outlet cylinder, first fan blade includes inner hub, outer hub, at least two first blades and at least two second blades, the outer hub is coaxial with the inner hub and is set on the outer periphery of the inner hub, the second channel is formed,

Description

Technical Field

[0001] This utility model relates to the field of fan equipment technology, and in particular to a fan blade pressurization air outlet device. Background Technology

[0002] Existing fan equipment typically houses the fan blades within the fan's air outlet cavity, allowing the airflow to enter the outlet cavity from the inlet as the blades rotate. The airflow is then agitated and blown out from the outlet at a certain speed and force, achieving the fan's blowing effect.

[0003] In everyday life, common air outlet devices typically use axial flow fan blades. The characteristic of axial flow fan blades is that the airflow path from the inlet to the outlet does not deviate radially; it is essentially equivalent to straight in and straight out. Air enters the axial flow fan blade axially from the inlet and then exits axially from the outlet. This method results in low wind resistance and therefore minimal airflow loss. In other words, to ensure minimal airflow loss, axial flow fan blades are used in the manufacture of axial flow air outlet devices.

[0004] In related technologies, existing axial flow air outlets typically use single-layer fan blades. While this results in low wind resistance and minimal airflow loss, it completely overlooks another technical issue: the low air pressure and short air delivery distance of axial flow air outlets. In other words, although there is no airflow loss, there is no incremental increase to compensate, and the air delivery distance is difficult to guarantee. Users who are even slightly away from the axial flow air outlet will not be able to experience the refreshing feeling of being cooled by the breeze. Utility Model Content

[0005] The main purpose of this invention is to propose a fan blade pressurization and air outlet device, which aims to pressurize and accelerate the intake air to improve the user experience.

[0006] To achieve the above objectives, the fan blade pressurization air outlet device proposed in this utility model includes a first fan blade, a second fan blade, a driving component, and an air outlet duct, wherein the first fan blade, the second fan blade, and the driving component are all disposed inside the air outlet duct;

[0007] The first fan blade includes an inner hub, an outer hub, at least two first blades, and at least two second blades. The outer hub is coaxially arranged with the inner hub and is sleeved on the outer periphery of the inner hub. A second channel is formed between the inner hub and the outer hub, and a first channel is formed between the outer hub and the air outlet. At least two first blades are located in the first channel and are spaced apart and connected to the outer periphery of the outer hub. At least two second blades are spaced apart in the second channel and connect the outer hub and the inner hub.

[0008] The second fan blade includes a connecting hub and at least two third blades. The inner hub is connected to one end of the connecting hub facing the air inlet side of the air outlet. A third channel is formed between the periphery of the connecting hub and the inner wall of the air outlet. At least two third blades are located in the third channel and are connected to the outer periphery of the second fan blade at intervals.

[0009] The air outlet duct is provided with a flow guide seat inside. The flow guide seat includes a fixed part and at least two flow guide blades. A fourth channel is formed between the periphery of the fixed part and the inner wall of the air outlet duct. At least two flow guide blades are located in the fourth channel and are connected to the periphery of the fixed part and the inner wall of the air outlet duct at intervals. The first channel, the second channel, the third channel and the fourth channel are connected and together form the air outlet flow channel of the fan blade pressurized air outlet device.

[0010] The drive component is mounted on the fixed part, and the connecting hub is connected to the rotating part of the drive component. The drive component can drive the first fan blade and the second fan blade to rotate synchronously.

[0011] In one embodiment, each of the first blades is inclined along a first direction from its end near the air inlet side of the air outlet channel to its end near the air outlet side of the air outlet channel; each of the third blades is inclined along the first direction from its end near the air inlet side of the air outlet channel to its end near the air outlet side of the air outlet channel; each of the guide vanes is inclined along a second direction from its end near the air inlet side of the air outlet channel to its end near the air outlet side of the air outlet channel, the second direction being opposite to the first direction.

[0012] In one embodiment, the cross-sectional area of ​​the inner hub gradually increases along the air outlet direction of the air outlet channel, and the cross-sectional area of ​​the second channel gradually decreases along the air outlet direction of the air outlet channel.

[0013] In one embodiment, the connecting hub includes a limiting section located at the end of the second fan blade near the air intake side of the air outlet duct, and the inner hub is sleeved on the outer peripheral surface of the limiting section.

[0014] The cross-sectional area of ​​the limiting section gradually increases along the air outlet direction of the air outlet channel.

[0015] In one embodiment, the connecting hub includes a guide section connected to the limiting section, the limiting section and the guide section are arranged along the air outlet direction of the air outlet channel, and the cross-sectional area of ​​the guide section is larger than the cross-sectional area of ​​the limiting section.

[0016] The cross-sectional area of ​​the guide section gradually increases along the air outlet direction of the air outlet channel.

[0017] In one embodiment, the cross-sectional area of ​​the inner hub is the same as that of the guide section at the joint, and the outer surface of the inner hub is connected to the outer surface of the guide section.

[0018] In one embodiment, the connecting hub includes a rectifier section connected to the guide section, and the guide section and the rectifier section are arranged along the air outlet direction of the air outlet channel;

[0019] The outer surface of the rectifier section is arranged parallel to the inner surface of the air outlet, and the third blade is located in the rectifier section.

[0020] In one embodiment, the cross-sectional area of ​​the third channel between the outer wall of the rectifier section and the inner wall of the air outlet is less than or equal to the cross-sectional area of ​​the fourth channel between the outer wall of the guide seat and the inner wall of the air outlet.

[0021] In one embodiment, each of the guide vanes includes a first guide section and a second guide section, the second guide section being connected to the fixing part, the first guide section being located at the end of the second guide section near the third vane, and the first guide section extending into the third channel;

[0022] The cross-sectional area of ​​the first guide section gradually decreases along the air outlet direction of the air outlet channel, so as to form a clearance gap between the first guide section and the connecting hub.

[0023] In one embodiment, the fixing part is provided with a mounting part on the end face of the air inlet side facing the air outlet channel;

[0024] The driving component is an external rotor motor, which includes a fixed shaft, an inner stator, and an external rotor. The fixed shaft is inserted into the mounting part and connects the inner hub and the connecting hub. The inner stator is fixedly sleeved on the outer surface of the mounting part. The external rotor is connected to the inner wall of the connecting hub and is arranged around the inner stator.

[0025] The outer surface of the mounting part is arranged parallel to the inner surface of the air outlet duct.

[0026] In the technical solution of this utility model, firstly, a double-hub structure of the first blade is used to construct two independent and complementary airflow processing channels: the second channel and the first channel. When the airflow enters the equipment, part of the airflow in the second channel is pressurized by the rotation of the second blade, while the other part of the airflow in the first channel is accelerated by the high-speed drive of the first blade. This dual-path synergy solves the core defect of traditional equipment lacking an airflow pressurization stage from the source. Next, by setting a second blade connected to the rotating part of the drive component, a third blade is used in the third channel to further process the airflow entering the third channel. The system rectifies the airflow by eliminating the rotational component and reducing energy loss during airflow transmission, thus preventing further reduction in air pressure and delivery efficiency due to airflow turbulence. Finally, the guide vanes in the air outlet duct guide seat directionally constrain the rectified airflow in the fourth channel, preventing airflow diffusion at the outlet end and ensuring concentrated axial output, further improving outlet air pressure and directionality. Through the three-stage progressive airflow treatment structure of "pressurization-rectification-guidance", a complete air pressure enhancement and air delivery optimization system is formed, effectively solving the technical problems of low air pressure and short delivery distance of traditional axial flow fan-type pressurized air outlet equipment. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 Exploded view of an embodiment of the fan blade pressurization air outlet device provided by this utility model;

[0029] Figure 2 A cross-sectional view of an embodiment of the fan blade pressurization and air outlet device provided by this utility model;

[0030] Figure 3 for Figure 1 A diagram showing the flow direction of the internal airflow in an embodiment of a fan blade pressurized air outlet device;

[0031] Figure 4 A schematic diagram of the structure of an embodiment of the first fan blade provided by this utility model;

[0032] Figure 5 A schematic diagram of the structure of an embodiment of the second fan blade provided by this utility model;

[0033] Figure 6 A schematic diagram of the structure of an embodiment of the air outlet duct provided by this utility model;

[0034] Figure 7 for Figure 6 The back view.

[0035] Explanation of icon numbers:

[0036] 1000. Pressurized air outlet device; 10. First fan blade; 11. Inner hub; 12. Outer hub; 13. First blade; 14. Second blade; 10a. First channel; 10b. Second channel; 20. Second fan blade; 21. Connecting hub; 211. Limiting section; 212. Guide section; 213. Rectifying section; 20a. Third channel; 22. Third blade; 30. Air outlet duct; 30a. Four channels; 30b, second wire passage hole; 31, flow guide seat; 31a, clearance notch; 311, fixing part; 311a, first wire passage hole; 312, flow guide blade; 312a, wire passage groove; 3121, first flow guide section; 3122, second flow guide section; 313, mounting part; 313a, heat dissipation cavity; 40, external rotor motor; 401, fixed shaft; 402, inner stator; 403, external rotor.

[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0039] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0040] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0041] Please see Figure 1 , Figure 4 , Figure 5 as well as Figure 6The fan blade pressurized air outlet device 1000 proposed in this utility model includes a first fan blade 10, a second fan blade 20, a driving component, and an air outlet duct 30. The first fan blade 10, the second fan blade 20, and the driving component are all disposed inside the air outlet duct 30. The first fan blade 10 includes an inner hub 11, an outer hub 12, at least two first blades 13, and at least two second blades 14. The outer hub 12 is coaxially arranged with the inner hub 11 and is sleeved on the outer periphery of the inner hub 11. The inner hub 11 and the outer hub 12 are connected. A second channel 10b is formed between the hubs 12, and a first channel 10a is formed between the outer hub 12 and the air outlet duct 30. At least two first blades 13 are located in the first channel 10a and are spaced apart and connected to the outer periphery of the outer hub 12. At least two second blades 14 are spaced apart in the second channel 10b and connect the outer hub 12 and the inner hub 11. The second fan blade 20 includes a connecting hub 21 and at least two third blades 22. The inner hub 11 is connected to the end of the connecting hub 21 facing the air inlet side of the air outlet duct 30. A third channel 20a is formed between the periphery of the connecting hub 21 and the inner wall of the air outlet duct 30. At least two third blades 22 are located in the third channel 20a and are spaced apart and connected to the outer periphery of the second fan blade 20. The air outlet duct 30 is provided with a guide seat 31. The guide seat 31 includes a fixing part 311 and at least two guide blades 312. A fourth channel 30a is formed between the periphery of the fixing part 311 and the inner wall of the air outlet duct 30. At least two... The guide vane 312 is located in the fourth channel 30a and is spaced apart and connected to the periphery of the fixed part 311 and the inner wall of the air outlet duct 30. The first channel 10a, the second channel 10b, the third channel 20a and the fourth channel 30a are connected and together form the air outlet flow channel of the fan blade pressurized air outlet device 1000. The drive component is installed in the fixed part 311 and the connecting hub 21 is connected to the rotating part of the drive component. The drive component can drive the first fan blade 10 and the second fan blade 20 to rotate synchronously.

[0042] Please see details. Figure 1 The first fan blade 10, the second fan blade 20, and the driving component are all built into the air outlet duct 30. The first fan blade 10, the second fan blade 20, and the driving component can be arranged sequentially along the axial direction of the air outlet duct 30, i.e., the air outlet direction of the airflow channel. The rotating part of the driving component is connected to both the first fan blade 10 and the second fan blade 20. Thus, when the driving component is in operation, it can drive both the first fan blade 10 and the second fan blade 20 to rotate. Alternatively, it can be arranged as follows: Figure 2 As shown, the first fan blade 10 and the second fan blade 20 are arranged along the axial direction of the air outlet duct 30. The second fan blade 20 is sleeved on the outer periphery of the driving component. The first fan blade 10 is connected to the second fan blade 20. In this way, when the driving component is in working condition, it can drive the first fan blade 10 and the second fan blade 20 to rotate. At the same time, it can compress the axial dimension of the air outlet duct 30.

[0043] For details, please see Figure 4The first fan blade 10 includes an inner hub 11, an outer hub 12, at least two first blades 13, and at least two second blades 14. A second channel 10b is formed between the coaxially arranged outer hub 12 and inner hub 11. Multiple first blades 13 are arranged around the outer periphery of the outer hub 12, and multiple second blades 14 are arranged around the inner wall of the outer hub 12 and the outer wall of the inner hub 11, connecting the outer hub 12 and inner hub 11. This allows the first fan blade 10 to adopt a combined airflow structure for better airflow performance. The first blades 13 can be axial flow blades or oblique flow blades, and the second blades 14 can be centrifugal blades. Since the number of centrifugal blades is not affected by the hub size or hub ratio, it meets the design requirements of small hubs and multiple blades. This allows the inner hub 11 to adopt a smaller structural design. Furthermore, compared to a fan blade structure with only axial flow blades, the number of second blades 14 can be increased by using centrifugal blades, which is beneficial for increasing the airflow volume of the first fan blade 10. At this time, by forming a first channel 10a between the outer hub 12 and the inner hub 11, the inner wall of the outer hub 12 can guide the airflow turbulent by the second blade 14 under centrifugal force, so that the airflow generated by the second blade 14 is axially discharged along the axial direction of the first blade 10. At this time, the rotation of the first blade 13 can generate axial or oblique airflow, and the airflow generated by the first blade 13 and the airflow generated by the second blade 14 can be combined and discharged from the air outlet cavity. This allows the fan blade to generate a larger air volume, further improving the intake air volume of the fan blade pressurized air outlet device 1000, which is conducive to better reducing the operating power of the fan and improving the practicality and reliability of the blowing device. Among them, the second blade 14, which adopts the centrifugal blade form, can generate airflow with higher air pressure. By mixing the airflow generated by the first blade 13 and the airflow generated by the second blade 14, the airflow generated by the fan blade can have higher air pressure and flow rate, thus improving the air outlet effect of the blowing device. Since the linear velocity inside the first blade 13 is less than that outside, the airflow generated by the axial flow blade has the characteristic of low velocity inside and high velocity outside. Therefore, when the first blade 13 is an axial flow blade, by setting the second blade 14 between the inner hub 11 and the outer hub 12, the airflow generated by the second blade 14 can make up for the deficiency of insufficient linear velocity inside the first blade 13, so that the first fan blade 10 can blow out a more uniform airflow, better achieve the large air volume intake effect of the blower, and further improve the structural stability and reliability of the blower.

[0044] Because the airflow from the first channel 10a and the second channel 10b has certain differences in wind speed and wind pressure, it is necessary to rectify the two airflows to overcome this difference. Therefore, a second fan blade 20 is provided on the outlet side of the first fan blade 10 along the outlet direction of the air outlet channel. The second fan blade 20 includes a connecting hub 21 and a third blade 22. The connecting hub 21 and the third blade 22 can be formed into an integral structure by injection molding, or they can be formed into a detachable structure by assembly methods such as plug-in, snap-fit, and screw connection. Based on the high-speed rotation of the fan blade pressurized air outlet device 1000, preferably, the connecting hub 21 and the third blade 22 are an integral structure. Please see details. Figure 2 and Figure 5 In the embodiment shown, the connecting hub 21 is a cylindrical hollow structure. The outer diameter of its end near the inner hub 11 matches the inner diameter of the inner hub 11, and the inner diameter of the connecting hub 21 matches the outer diameter of the rotating part of the drive component. This allows for the fixed installation of the inner hub 11, the connecting hub 21, and the drive component. The third blades 22 are evenly spaced along the circumference of the outer peripheral wall of the connecting hub 21, employing an axial airfoil adapted to airflow rectification requirements. Please see [link to details]. Figure 3 When the fan blade pressurized air outlet device 1000 is started, the drive unit drives the second fan blade 20 to rotate synchronously with the first fan blade 10. The airflow enters the first fan blade 10 from the air inlet side of the air outlet duct 30, and then splits into the first channel 10a and the second channel 10b respectively. The first channel 10a of the first fan blade 10 forms an airflow with a high velocity, low wind pressure and a difference in internal and external velocity. The second channel 10b forms an airflow with a high wind pressure and low velocity. The two airflows enter the third channel 20a of the second fan blade 20. Under the disturbance of the third blade 22, the two airflows in the third channel 20a are finally rectified and present a stable axial flow state, smoothly entering the fourth channel 30a of the guide seat 31. Under the constraint of the guide blade 312, the airflow is concentrated and output along the axial direction of the air outlet duct 30. At the same time, since the third blade 22 is an axial flow blade, the airflow resistance is small, which effectively reduces the operating noise of the equipment.

[0045] The air outlet duct 30 has a guide seat 31 at the air outlet end of the air outlet channel. The guide seat 31 is located inside the air outlet duct 30 and is coaxially arranged with the second fan blade 20. The guide seat 31 is located on the air outlet side of the second fan blade 20 along the air outlet direction of the air outlet channel. The guide seat 31 is used to guide the airflow after rectification by the second fan blade 20. Please see details. Figure 2 and Figure 6The guide vane 31 comprises a fixing part 311 and at least two guide vanes 312. The fixing part 311 serves the dual function of fixing the guide vanes 312 and installing the driving component. Its structure is adapted to the installation requirements of the driving component and can provide stable support for the driving component. The fixing part 311 is connected to the inner wall of the air outlet duct 30 through the guide vanes 312 to ensure that the guide vane 31 does not shift during equipment operation. At least a plurality of guide vanes 312 are spaced apart along the circumferential direction of the fixing part 311. The vanes are generally arc-shaped or streamlined to adapt to the airflow trajectory. One end of the guide vane 312 is fixedly connected to the outer peripheral wall of the fixing part 311, and the other end is connected to the inner wall of the air outlet duct 30. The connection part is smoothly transitioned to avoid airflow generation. Vortex; When the fan-blade pressurized air outlet device 1000 is running, the airflow, which is in a stable axial flow state after being rectified by the second fan blade 20, will continuously enter the guiding range of the guide seat 31. At this time, the guide blade 312 plays a guiding role, constraining the airflow through its own arc or streamlined structure, preventing the airflow from spreading radially during transmission to the air outlet end of the air outlet duct 30. At the same time, when the airflow flows along the surface of the guide blade 312, the blade can further sort out the small turbulence in the airflow, making the airflow direction more in line with the axis of the air outlet duct 30. Finally, the airflow is output from the air outlet end of the air outlet duct 30 in a concentrated and stable state, effectively improving the air delivery distance and directionality of the fan-blade pressurized air outlet device 1000, and further optimizing the user's blowing experience.

[0046] In the technical solution of this utility model, firstly, through the double-hub structure of the first fan blade 10, two independent and complementary airflow processing channels, the second channel 10b and the first channel 10a, are constructed. When the airflow enters the equipment, part of the airflow in the second channel 10b is pressurized by the rotation of the second blade 14, while the other part of the airflow in the first channel 10a is accelerated by the high-speed drive of the first blade 13. The dual-path synergy solves the core defect of traditional equipment lacking an airflow pressurization link from the source. Next, by setting the second fan blade 20 connected to the rotating part of the drive component, the third blade 22 is used to pressurize the airflow entering the third channel 20a. The airflow in channel 20a is combed to counteract the rotational component of the airflow, reduce energy loss during airflow transmission, and prevent further reduction in air pressure and air delivery efficiency due to airflow turbulence. Finally, the guide vanes 312 of the guide seat 31 inside the outlet duct 30 are used to directionally constrain the rectified airflow in the fourth channel 30a to prevent the airflow from spreading at the outlet end and ensure that the airflow is concentrated along the axial direction, further improving the outlet air pressure and directionality. Through the three-stage progressive airflow treatment structure of "pressurization-rectification-guided flow", a complete air pressure enhancement and air delivery optimization system is formed, which ultimately effectively solves the technical problems of low air pressure and short air delivery distance of traditional axial flow fan blade pressurized air outlet equipment.

[0047] Furthermore, each first blade 13 is inclined along a first direction from the end near the air inlet side of the air outlet channel to the end near the air outlet side of the air outlet channel; each third blade 22 is inclined along a first direction from the end near the air inlet side of the air outlet channel to the end near the air outlet side of the air outlet channel; each guide blade 312 is inclined along a second direction from the end near the air inlet side of the air outlet channel to the end near the air outlet side of the air outlet channel, and the second direction is opposite to the first direction.

[0048] In this embodiment, please refer to Figure 1 In the embodiment shown, along the air outlet direction of the air outlet duct, the ends of the first blade 13 and the third blade near the air inlet side of the air outlet duct 30 deflect clockwise (i.e., the first direction) as they extend to the ends near the air outlet side of the air outlet duct 30. Thus, when the first blade 10 and the second blade 20 rotate synchronously, the circumferential velocity components applied to the airflow are in the same direction, both clockwise. This maintains a relatively small clockwise tangential velocity in the airflow within the third channel 20a, avoiding vortex noise and energy loss caused by "reverse shearing" between the two stages of moving blades. Along the air outlet direction of the air outlet duct... The end of the guide vane 312 near the air inlet side of the air outlet duct 30 deflects in a counterclockwise direction (i.e., the second direction) as it extends to the end near the air outlet side of the air outlet duct 30. Thus, the tilt direction of the guide vane 312 is opposite to the tilt direction of the third vane 22. When the airflow flows out from the third channel 20a, the rotational energy it carries is converted into more stable axial flow energy under the action of the reverse bending arc surface of the guide vane 312, reducing the airflow dispersion caused by excessive rotation, and making the airflow flow more concentrated along the preset path of the fourth channel 30a, thereby improving the stability of the pressurization effect.

[0049] In one implementation, please refer to Figure 2 The cross-sectional area of ​​the inner hub 11 gradually increases along the air outlet direction of the air outlet channel, while the cross-sectional area of ​​the second channel 10b gradually decreases along the air outlet direction of the air outlet channel.

[0050] In this embodiment, the cross-sectional area of ​​the inner hub 11 gradually increases along the air outlet direction of the air outlet channel. Correspondingly, the flow cross-section of the second channel 10b formed by the inner hub 11 and the outer hub 12 gradually decreases along the air outlet direction of the air outlet channel. Because the airflow in the second channel 10b is driven by the second blade 14 (centrifugal blade) and has the initial characteristic of "high pressure and low speed", expanding the cross-sectional area of ​​the inner hub 11 along the air outlet direction can form a "gradually narrowing flow channel" by reducing the flow cross-section of the second channel 10b. The reduction of the flow cross-section can force the airflow to accelerate within the second channel 10b. At the same time, the gradually narrowing structure can compress the airflow, further increasing the airflow pressure and compensating for the insufficient air pressure of traditional axial flow equipment. Moreover, this structure complements the first blade 13. The high-speed airflow in the first channel 10a is driven by the high-pressure airflow in the second channel 10b, which is treated by the tapering structure, and merges with it to achieve a combination of "high velocity + high pressure". When the airflow enters the second channel 10b, as the cross-sectional area of ​​the inner hub 11 gradually increases, the flow space in the second channel 10b continuously shrinks. Under the dual action of the rotation drive of the second blade 14 and the compression of the tapering channel, the pressure and velocity of the airflow increase simultaneously. The tapering structure can guide the airflow to flow smoothly along the inner wall of the channel, reducing the eddies caused by the sudden change in the flow channel. Subsequently, the high-pressure accelerated airflow flows out from the second channel 10b and merges with the high-speed airflow driven by the first blade 13 in the first channel 10a, which is inclined in the first direction. Then, it is rectified by the third blade 22, which is inclined in the first direction, to eliminate the velocity difference between the two airflows.

[0051] In one implementation, please refer to Figure 2 and Figure 5 The connecting hub 21 includes a limiting section 211, which is located at the end of the second fan blade 20 near the air intake side of the air outlet channel. The inner hub 11 is fitted onto the outer circumferential surface of the limiting section 211. The cross-sectional area of ​​the limiting section 211 gradually increases along the air outlet direction of the air outlet channel.

[0052] In this embodiment, the limiting section 211 is located at the end of the second fan blade 20 near the air intake side of the air outlet duct. Its core function is to provide an assembly reference for the inner hub 11. When the inner hub 11 is fitted onto the outer circumferential surface of the limiting section 211, the axial length of the limiting section 211 matches the axial assembly requirements of the inner hub 11, directly limiting the axial assembly position of the inner hub 11 and avoiding relative positional deviations between the first fan blade 10 and the second fan blade 20 due to excessively deep or shallow assembly, thus ensuring coaxiality of the two during rotation. Simultaneously, the cross-sectional area of ​​the limiting section 211 gradually increases along the air outlet direction of the air outlet duct, forming a "gradually expanding" outer circumferential surface structure. This design creates a "guide-clamping" assembly effect for the inner hub 11 during the fitting process—in the initial assembly stage, the smaller cross-sectional area of ​​the limiting section 211 facilitates the quick fitting of the inner hub 11, serving as a guide and reducing... The assembly alignment is simplified. As the inner hub 11 advances along the air outlet direction, the cross-sectional area of ​​the limiting section 211 gradually increases, and the fit clearance with the inner wall of the inner hub 11 gradually decreases, eventually forming a tight interference fit. Initial positioning can be achieved without additional complex fixing structures, and subsequent fixation can be completed with simple screw tightening or snap-fit ​​connection. This simplifies the assembly process and improves connection stability. In addition, this gradually expanding structure can disperse the stress at the connection between the inner hub 11 and the limiting section 211, avoiding component deformation caused by localized stress concentration in traditional straight-tube fits. Especially when the equipment operates at high speed for a long time, it can reduce assembly loosening caused by vibration, ensure the synchronous rotation accuracy of the first fan blade 10 and the second fan blade 20, reduce the risk of airflow turbulence caused by component misalignment from the assembly source, and improve the overall assembly efficiency and operational reliability of the equipment.

[0053] In one implementation, please refer to Figure 2 and Figure 5 The connecting hub 21 includes a guide section 212 connected to the limiting section 211. The limiting section 211 and the guide section 212 are arranged along the air outlet direction of the air outlet channel. The cross-sectional area of ​​the guide section 212 is larger than the cross-sectional area of ​​the limiting section 211. The cross-sectional area of ​​the guide section 212 gradually increases along the air outlet direction of the air outlet channel.

[0054] In this embodiment, since the second channel 10b serves as the flow channel enclosed by the inner hub 11 and the outer hub 12, the airflow exiting it is pressurized by the second blade 14 (centrifugal blade) and initially flows close to the outer wall of the inner hub 11. Meanwhile, the airflow exiting the first channel 10a, driven by the first blade 13, flows along the outer wall of the outer hub 12 towards the outlet direction. The two airflows have a radial distance, and without guidance, they are prone to merging delays or turbulence. Therefore, a guide section 212 is provided on the side of the limiting section 211 facing away from the air inlet side of the outlet flow channel, along the outlet direction of the airflow channel. The cross-sectional area of ​​the guide section 212 is larger than that of the limiting section 211. Thus, the cross-sectional area of ​​the third channel 20a between the guide section 212 and the inner wall of the outlet duct 30 gradually decreases along the outlet direction of the airflow channel. The airflow exiting the second channel 10b is accelerated in this part of the channel. This allows the airflow to merge with the airflow of the first channel 10a. Simultaneously, the rate of change of the cross-sectional area of ​​the guide section 212 is greater than that of the limiting section 211, meaning the guide section 212 is steeper than the limiting section 211. Its rapidly expanding cross-sectional area causes the flow cross-section of the third channel 20a formed by the guide section 212 and the inner wall of the outlet duct 30 to shrink rapidly. This rapid contraction of the flow cross-section accelerates the airflow in the second channel 10b. The steep structure also forces the airflow trajectory to shift rapidly outwards. This steep design allows for the acceleration and expansion of the airflow within a shorter axial distance, avoiding energy loss due to excessively long guide distances. This enables the airflow in the second channel 10b to effectively overlap with the airflow in the first channel 10a in spatial position before entering the rectification area of ​​the third blade 22, creating favorable conditions for the subsequent rectification and fusion of the third blade 22.

[0055] In one implementation, please refer to Figure 2 and Figure 5 The cross-sectional area of ​​the inner hub 11 is the same as that of the guide section 212 at the joint, and the outer surface of the inner hub 11 is connected to the outer surface of the guide section 212.

[0056] In this embodiment, the air outlet face of the inner hub 11 and the air inlet face of the guide section 212 are designed to be joined with equal diameters, and their cross-sectional areas at the joint are completely identical, forming a continuous, stepless conformal surface. Specifically, the profile of the outer wall of the inner hub 11 and the profile of the outer wall of the guide section 212 have the same diameter at the joint. Thus, when the high-pressure, low-speed airflow in the second channel 10b flows out along the outer wall of the inner hub 11, it can seamlessly adhere to the outer wall of the guide section 212 and continue flowing, completely eliminating airflow stripping, eddies, and secondary backflow phenomena caused by abrupt changes in cross-section or steps. At the same time, the continuous and smooth outer surface ensures that the airflow boundary layer is not interrupted, significantly reducing the local drag coefficient and turbulent noise.

[0057] In one implementation, please refer to Figure 2 and Figure 5The connecting hub 21 includes a rectifier section 213 connected to the guide section 212. The guide section 212 and the rectifier section 213 are arranged along the air outlet direction of the air outlet duct. The outer surface of the rectifier section 213 is parallel to the inner surface of the air outlet duct 30, and the third blade 22 is located in the rectifier section 213.

[0058] In this embodiment, the rectifying section 213 is designed as a cylindrical surface of equal diameter, with its outer wall maintaining a uniform distance from the inner wall of the outlet duct 30, forming a straight annular flow channel; the third blade 22 is located on this straight flow channel. When the two airflows converge in the guide section 212 and enter this "straight cylinder" area, the flow channel no longer contracts or expands. The blades only need to perform pure flow direction sorting on the airflow, smoothing out the residual rotational component little by little, so that it completely turns into axial motion. The straight wall surface avoids any additional disturbances, allowing the rectifying function of the third blade 22 to be maximized; at the same time, the rectifying section 213 itself also serves as the positioning reference for the third blade 22, ensuring that the gap between the outer edge of all blades and the inner wall of the outlet duct 30 is consistent, so that the airflow will not be deflected or generate additional vortices when passing through. Thus, the airflow reaches a uniform and straight state when leaving the third blade 22, providing a clean and stable foundation for the directional delivery of the subsequent guide seat 31.

[0059] In one embodiment, the cross-sectional area of ​​the third channel 20a between the outer wall of the rectifier section 213 and the inner wall of the air outlet duct 30 is less than or equal to the cross-sectional area of ​​the fourth channel 30a between the outer wall of the guide seat 31 and the inner wall of the air outlet duct 30.

[0060] In this embodiment, the rectifying section 213 is designed as a cylindrical surface of equal diameter, forming an annular gap of constant width between it and the inner wall of the air outlet duct 30; the outer wall of the guide seat 31 is also cylindrical, and the cross-sectional area of ​​the fourth channel 30a formed between it and the inner wall of the air outlet duct 30 is equal to or slightly larger than the cross-sectional area of ​​the corresponding third channel 20a of the rectifying section 213. Looking along the air outlet direction of the air outlet channel, the air outlet channel first presents the "equal width" third channel 20a, and then connects to the "unchanged or slightly expanded" fourth channel 30a. The airflow has been straightened by the third blade 22 in the third channel 20a, but the remaining small-scale vortices still need a certain back pressure to be "flattened". At this point, the cross-section remains narrow or unchanged, which is equivalent to continuously applying circumferential constraints to the airflow. The vortex is repeatedly "rubbed" and broken up by the wall, resulting in a more orderly flow direction. When the airflow enters the fourth channel 30a, the flow area even slightly increases, the local static pressure rises, the flow velocity slows down, and the airflow's adhesion to the wall is enhanced. The originally tightly attached boundary layer is even more difficult to separate. The guide vane 312 is located precisely in this area, which can easily cut and guide the slowed and oriented airflow piece by piece without expending energy to overcome rotation or vortices.

[0061] In one embodiment, each guide vane 312 includes a first guide section 3121 and a second guide section 3122. The second guide section 3122 is connected to the fixing part 311. The first guide section 3121 is located at the end of the second guide section 3122 near the third vane 22. The first guide section 3121 extends into the third channel 20a. The cross-sectional area of ​​the first guide section 3121 gradually decreases along the air outlet direction of the air outlet channel so that an avoidance gap 31a is formed between the first guide section 3121 and the connecting hub 21.

[0062] In this embodiment, each guide vane 312 includes a first guide section 3121 and a second guide section 3122. The first guide section 3121 is located at the end of the second guide section 3122 near the third vane 22. The second guide section 3122 is used to connect the fixing part 311. The first guide section 3121 extends into the third channel 20a. Thus, the first guide section 3121 acts as a bridge between the third channel 20a and the fourth channel 30a. When the airflow in the third channel 20a detaches from the third vane 22, it can quickly contact the arc surface of the first guide section 3121 and be guided into the fourth channel 30a. In section 0a, the second guide section 3122 guides the airflow to prevent turbulence in the transition area between the third channel 20a and the fourth channel 30a. At the same time, the cross-sectional area of ​​the first guide section 3121 gradually decreases along the air outlet direction of the air outlet channel, so that a clearance notch 31a is formed between the first guide section 3121 and the connecting hub 21. In this way, when the connecting hub 21 and the guide seat 31 are assembled, the end of the connecting hub 21 can be prevented from colliding with the guide blade 312. At the same time, for the guide blade 312, the clearance notch 31a facilitates the integral demolding of the fixing part 311 and the air outlet duct 30.

[0063] In one implementation, please refer to Figure 2 The mounting part 313 is provided on the end face of the fixed part 311 facing the air intake side of the air outlet channel; the driving component is an external rotor motor 40, which includes a fixed shaft 401, an inner stator 402 and an external rotor 403. The fixed shaft 401 is inserted into the mounting part 313 and connected to the inner hub 11 and the connecting hub 21. The inner stator 402 is fixedly sleeved on the outer surface of the mounting part 313. The external rotor is connected to the inner wall of the connecting hub and is arranged around the inner stator.

[0064] In this embodiment, a mounting portion 313 is provided on the end face of the drive component fixing portion 311 facing the air intake side of the air outlet duct to facilitate assembly. The drive component is fixed on the mounting portion 313. Specifically, the drive component is an external rotor motor 40, which includes a fixed shaft 401, an inner stator 402, and an external rotor 403, achieving efficient transmission connection with the first fan blade 10 and the second fan blade 20. The fixed shaft 401 is inserted into the mounting portion 313 and passes through the connecting hub 21 of the second fan blade 20 and the inner hub 11 of the first fan blade 10, providing a stable axial positioning for the entire external rotor motor 40. The inner stator 402 is fixedly sleeved on the outer surface of the mounting portion 313, forming a magnetic field base as the stationary part of the motor. The external rotor 403 rotatably surrounds the outer periphery of the inner stator 402, achieving rotational motion through electromagnetic induction. Since the connecting hub 21 is fixedly connected to the outer rotor 403, and the inner hub 11 is connected to the connecting hub 21, when the outer rotor 403 rotates under the action of electromagnetic force, it can directly drive the connecting hub 21 and the inner hub 11 to rotate synchronously, reducing energy loss in the transmission link and improving drive efficiency. This structural design makes the connection between the fan and the fan blades more compact, not only reducing the overall axial dimension, but also reducing the radial runout of the fan blades when rotating at high speed through the stable support of the mounting part 313, ensuring the stability of the airflow in the outlet channel; at the same time, the outer surface of the mounting part 313 is parallel to the inner surface of the air outlet duct 30, so the demolding direction of the mounting part 313 is consistent with the demolding direction of the air outlet duct 30, which is conducive to the integral demolding of the air outlet duct 30 and reduces the number of demolding times.

[0065] Further, please refer to Figure 7The outer rotor motor 40 and the second fan blade 20 are spaced apart from the guide seat 31 near the end of the guide seat 31 to form a heat dissipation cavity 313a with a connecting clearance notch 31a. The end face of the guide seat 31 facing the air inlet side of the air outlet channel is provided with a first wire passage hole 311a, a third blade 22 is provided with a wire passage groove 312a, and the outer wall of the air outlet duct 30 is provided with a second wire passage hole 30b. The heat dissipation cavity 313a, the first wire passage hole 311a, the wire passage groove 312a, and the second wire passage hole 30b are connected in sequence. In this way, no matter what kind of vibration or displacement occurs in the fan blade pressurized air outlet device 1000 during operation, the wire can remain stably threaded under the guidance of the wire passage groove 312a, avoiding the risk of electrical connection failure or short circuit due to loosening or friction. The heat dissipation cavity 313a connects the clearance notch 31a and the first wire passage hole 311a. A small amount of airflow in the third channel 20a can enter the heat dissipation cavity 313a through the clearance notch 31a. This part of the airflow flows sequentially along the first wire passage hole 311a, the wire passage groove 312a, and the second wire passage hole 30b in the heat dissipation cavity 313a, which can carry away the heat generated by the driving component. At the same time, the orientation of the second wire passage hole 30b on the outer peripheral wall of the air outlet duct 30 has a certain angle or even a 90-degree angle with the orientation of the air outlet end of the air outlet channel. In this way, the hot airflow coming out of the second wire passage hole 30b will not interfere with or mix with the airflow coming out of the air outlet channel, thereby avoiding the adverse effects of hot air backflow on the temperature, pressure, and directional stability of the air outlet airflow.

[0066] The above are merely exemplary embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the technical concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A fan blade pressurization air outlet device, characterized in that, The fan blade pressurized air outlet device includes a first fan blade (10), a second fan blade (20), a driving component, and an air outlet duct (30). The first fan blade (10), the second fan blade (20), and the driving component are all located inside the air outlet duct (30). The first fan blade (10) includes an inner hub (11), an outer hub (12), at least two first blades (13) and at least two second blades (14). The outer hub (12) is coaxially arranged with the inner hub (11) and sleeved on the outer periphery of the inner hub (11). A first channel (10a) is formed between the outer hub (12) and the air outlet (30). At least two first blades (13) are located in the first channel (10a) and are spaced apart and connected to the outer periphery of the outer hub (12). A second channel (10b) is formed between the inner hub (11) and the outer hub (12). At least two second blades (14) are spaced apart in the second channel (10b) and connect the outer hub (12) and the inner hub (11). The second fan blade (20) includes a connecting hub (21) and at least two third blades (22). The inner hub (11) is connected to one end of the connecting hub (21) facing the air inlet side of the air outlet. A third channel (20a) is formed between the periphery of the connecting hub (21) and the inner wall of the air outlet (30). At least two of the third blades (22) are located in the third channel (20a) and are connected at intervals to the outer periphery of the second fan blade (20). The air outlet duct (30) is provided with a flow guide seat (31) inside. The flow guide seat (31) includes a fixing part (311) and at least two flow guide blades (312). A fourth channel (30a) is formed between the periphery of the fixing part (311) and the inner wall of the air outlet duct (30). At least two flow guide blades (312) are located in the fourth channel (30a) and are spaced apart and connected to the periphery of the fixing part (311) and the inner wall of the air outlet duct (30). The first channel (10a), the second channel (10b), the third channel (20a) and the fourth channel (30a) are connected and together form the air outlet flow channel of the fan blade pressurized air outlet device. The drive component is mounted on the fixed part (311), and the connecting hub (21) is connected to the rotating part of the drive component. The drive component can drive the first fan blade (10) and the second fan blade (20) to rotate synchronously.

2. The fan blade pressurization air outlet device as described in claim 1, characterized in that, Each of the first blades (13) is inclined along a first direction from the end near the air inlet side of the air outlet channel to the end near the air outlet side of the air outlet channel; each of the third blades (22) is inclined along the first direction from the end near the air inlet side of the air outlet channel to the end near the air outlet side of the air outlet channel; each of the guide blades (312) is inclined along a second direction from the end near the air inlet side of the air outlet channel to the end near the air outlet side of the air outlet channel, the second direction being opposite to the first direction.

3. The fan blade pressurization air outlet device as described in claim 1, characterized in that, The cross-sectional area of ​​the inner hub gradually increases along the air outlet direction of the air outlet channel, while the cross-sectional area of ​​the second channel (10b) gradually decreases along the air outlet direction of the air outlet channel.

4. The fan blade pressurization air outlet device as described in any one of claims 1 to 3, characterized in that, The connecting hub (21) includes a limiting section (211), which is located at the end of the second fan blade (20) near the air intake side of the air outlet channel, and the inner hub (11) is sleeved on the outer peripheral surface of the limiting section (211). The cross-sectional area of ​​the limiting section (211) gradually increases along the air outlet direction of the air outlet channel.

5. The fan blade pressurization air outlet device as described in claim 4, characterized in that, The connecting hub (21) includes a guide section (212) connected to the limiting section (211). The limiting section (211) and the guide section (212) are arranged along the air outlet direction of the air outlet channel. The cross-sectional area of ​​the guide section (212) is larger than the cross-sectional area of ​​the limiting section (211). The cross-sectional area of ​​the guide section (212) gradually increases along the air outlet direction of the air outlet channel.

6. The fan blade pressurization and air outlet device as described in claim 5, characterized in that, The cross-sectional area of ​​the inner hub (11) is the same as that of the guide section (212) at the joint, and the outer surface of the inner hub (11) is connected to the outer surface of the guide section (212).

7. The fan blade pressurization and air outlet device as described in claim 5, characterized in that, The connecting hub (21) includes a rectifier section (213) connected to the guide section (212), and the guide section (212) and the rectifier section (213) are arranged along the air outlet direction of the air outlet channel; The outer surface of the rectifier section (213) is arranged parallel to the inner surface of the air outlet (30), and the third blade (22) is located in the rectifier section (213).

8. The fan blade pressurization air outlet device as described in claim 7, characterized in that, The cross-sectional area of ​​the third channel (20a) between the outer wall of the rectifier section (213) and the inner wall of the air outlet (30) is less than or equal to the cross-sectional area of ​​the fourth channel (30a) between the outer wall of the guide seat (31) and the inner wall of the air outlet (30).

9. The fan blade pressurization air outlet device as described in any one of claims 1 to 3, characterized in that, Each of the aforementioned guide vanes (312) includes a first guide section (3121) and a second guide section (3122), the second guide section (3122) being connected to the fixing part (311), the first guide section (3121) being located at the end of the second guide section (3122) near the third vane (22), and the first guide section (3121) extending into the third channel (20a); The cross-sectional area of ​​the first guide section (3121) gradually decreases along the air outlet direction of the air outlet channel, so that an avoidance gap (31a) is formed between the first guide section (3121) and the connecting hub (21).

10. The fan blade pressurization air outlet device as described in claim 9, characterized in that, The fixing part (311) has a mounting part (313) on the end face of the air inlet side facing the air outlet channel; The driving component is an external rotor motor (40), which includes a fixed shaft (401), an inner stator (402), and an external rotor (403). The fixed shaft (401) is inserted into the mounting part (313) and connects the inner hub (11) and the connecting hub (21). The inner stator (402) is fixedly sleeved on the outer surface of the mounting part (313). The external rotor (403) is connected to the inner wall of the connecting hub (21) and is arranged around the inner stator (402).

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