Fan flow guide structure

Abstract

The utility model relates to a fan flow guide structure, which belongs to the technical field of fans and comprises an air duct shell component, an airflow pushing component and a lead component, the air duct shell component comprises an air inlet shell and an air outlet shell which are detachably connected, and an air inlet channel penetrating through two opposite ends of the air inlet shell is arranged in the air inlet shell. An air outlet channel penetrating through the two opposite ends of the air outlet shell is formed in the air outlet shell and communicates with the air inlet channel, and a mounting part is arranged in the air inlet shell; the airflow pushing assembly is arranged on the mounting part and used for pushing air from the air inlet channel to the air outlet channel. The airflow pushing assembly comprises a hub, fan blades evenly distributed on the peripheral wall of the hub and a rotation driving piece used for driving the hub to rotate. The wire assembly comprises a first wire passing part penetrating through the mounting part and a second wire passing part communicating with the inner side and the outer side of the air inlet shell.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan technical field more specifically, relate to a fan flow guide structure. BACKGROUND

[0002] Fan is a kind of device for generating airflow, wind flow is manufactured by rotating fan blade, to bring cool feeling.The origin can be traced back to ancient times, but the mechanical fan and electric fan of true meaning are gradually developed in modern times.Fan is various, according to use occasion and shape characteristics, mainly can be divided into floor fan, table fan, air circulation fan, ceiling fan, wall fan, air conditioner fan and bladeless fan etc.These fans have characteristics, are applicable to different occasions and needs.

[0003] The working principle of fan is mainly that energized coil is forced in magnetic field and rotates, fan blade rotates, air is cut to form airflow, cause the airflow of surrounding air, to bring cool feeling, in this process, electric energy is mainly converted into mechanical energy.

[0004] But the power cord and other connecting lines of the existing fan are often exposed to the outside, appear in disorder, which not only affects the overall aesthetic property of fan, but also may need to spend additional time and effort to arrange these cables. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is that the power cord and other connecting lines of the existing fan are often exposed to the outside, appear in disorder, which not only affects the overall aesthetic property of fan, but also may need to spend additional time and effort to arrange these cables, in view of the above defects of prior art, provide a fan flow guide structure.

[0006] The technical scheme adopted by the utility model to solve its technical problem is:

[0007] A kind of fan flow guide structure is constructed, comprising:

[0008] Air duct shell assembly, the air duct shell assembly includes detachably connected air inlet shell and air outlet shell, the air inlet shell is provided with air inlet channel through opposite ends thereof, the air outlet shell is provided with air outlet channel through opposite ends thereof, the air outlet channel is communicated with the air inlet channel, the air inlet shell is provided with mounting portion;

[0009] Air flow pushing assembly is arranged on the mounting portion and is used to push air from air inlet channel to air outlet channel and then flow out to external space, the air flow pushing assembly includes hub, fan blade evenly distributed on the outer peripheral wall of the hub and rotating drive member for driving the hub to rotate;

[0010] The wire assembly comprises a first wire passing portion penetrating the mounting portion, and a second wire passing portion connecting the inside and outside of the air inlet shell.

[0011] Optionally, the mounting portion comprises a ring-shaped mounting member and an assembly column arranged at the end of the ring-shaped mounting member away from the air outlet shell, the hub is rotationally connected to the assembly column, and the outer peripheral wall of the ring-shaped mounting member is connected to the inner wall of the air inlet shell through a flow guide plate.

[0012] Optionally, the end of the ring-shaped mounting member close to the air outlet shell is connected to a flow guide supercharging column penetrating into the air outlet shell through a detachable connecting assembly, the detachable connecting assembly comprises a plug-in slot arranged at the end of the ring-shaped mounting member close to the air outlet shell and a plug-in block arranged at the bottom of the flow guide supercharging column for plugging into the plug-in slot.

[0013] Optionally, the bottom of the plug-in slot is provided with a plug-in column, the plug-in column is provided with a plug-in hole, and the bottom of the flow guide supercharging column is further provided with a plug-in column which can be plugged into the plug-in hole.

[0014] Optionally, one end of the air inlet shell is provided with a first connecting plate, the four corners of the first connecting plate are provided with a first connecting hole and a positioning hole, one end of the air outlet shell close to the air inlet shell is provided with a second connecting plate, the four corners of the second connecting plate are provided with a positioning plug-in column which can be plugged into the positioning hole and a second connecting hole which is matched with the first connecting hole, and the first connecting hole and the second connecting hole can be fastened and connected through a connecting member.

[0015] Optionally, the first wire passing portion comprises a first wire passing slot penetrating the top and bottom of the ring-shaped mounting member and a second wire passing slot penetrating the plug-in slot and the outer side wall of the ring-shaped mounting member, the first wire passing slot is in communication with the second wire passing slot, and the second wire passing portion comprises a third wire passing slot penetrating the inner side wall and the outer side wall of the air inlet shell.

[0016] Optionally, the wire assembly comprises a wire pressing rod arranged at the end of the air outlet shell close to the air inlet shell for clamping the cables in the second wire passing slot and the third wire passing slot, and the thickness of the wire pressing rod is smaller than the depth of the second wire passing slot and the third wire passing slot.

[0017] Optionally, the hub is provided with a flow guide head at the end away from the assembly column, the outer peripheral wall of the hub is provided with a flow guide inclined surface, and the front end of the fan blade and the tail end of the fan blade are twisted and inclined in the circumferential direction towards opposite directions.

[0018] Optionally, a plurality of flow guide plates are arranged around the ring-shaped mounting member, and the wire pressing rod is opposite to any one of the plurality of flow guide plates.

[0019] Optionally, the inner diameter of the air outlet shell gradually decreases from the direction close to the air inlet shell to the direction away from the air inlet shell, and the cross-sectional area of the flow guide booster column gradually decreases from the direction close to the air inlet shell to the direction away from the air inlet shell.

[0020] The utility model discloses the beneficial effect lies in:

[0021] The utility model discloses a wind channel shell assembly, airflow push subassembly and wire subassembly are provided with, the wind channel shell assembly includes the air inlet shell and the air outlet shell of detachable connection, the air inlet shell is provided with the air inlet channel of through opposite two ends thereof, the air outlet shell is provided with the air outlet channel of through opposite two ends thereof, the air outlet channel is linked together with air inlet channel, the air inlet shell is provided with the mounting portion, airflow push subassembly sets up on mounting portion and is used for propelling air from the air inlet channel to the air outlet channel, airflow push subassembly includes the hub, the fan blade of uniform distribution on the outer peripheral wall of hub and the rotation drive part for driving the hub rotates, wire subassembly includes the first wire through the mounting portion, the second wire of intercommunication air inlet shell inside and outside, when using the utility model, can start airflow push subassembly first, and airflow push subassembly propels the air from the air inlet channel to the air outlet channel after the external air is inhaled, ensures that air is effectively inhaled from the air inlet and is propelled to the air outlet, and airflow push subassembly includes the hub, the fan blade and the rotation drive part, is installed on the mounting portion of air inlet shell, and the uniform distribution of fan blade can maximize the air power efficiency, and the detachable connection of air inlet shell and air outlet shell not only facilitates cleaning but also can conveniently better air inlet shell or air outlet shell, and wire subassembly realizes the intercommunication of air inlet shell inside and outside through the first wire and the second wire, facilitates the connection of rotation drive part and external power supply, so that the power cord and control line can be arranged in the fan interior neatly and safely, and the line is avoided disorderly and hidden danger. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the utility model will be further described below in conjunction with the drawings and embodiments, and the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor:

[0023] Figure 1 It is the overall shaft measurement schematic diagram of the utility model.

[0024] Figure 2 It is the overall side schematic diagram of the utility model.

[0025] Figure 3 It is the section schematic diagram of the utility model along Figure 2 A-A is cut.

[0026] Figure 4 is the overall front view of the utility model.

[0027] Figure 5 is the overall back view of the utility model.

[0028] Figure 6 is the overall explosion view of the utility model.

[0029] Figure 7 is another overall explosion view of the utility model.

[0030] Figure 8 is the back view of the air outlet shell of the utility model.

[0031] Reference signs are:

[0032] 100, air duct shell assembly; 110, air inlet channel; 120, air outlet channel; 130, air inlet shell; 131, first connecting plate; 131.1, first connecting hole; 131.2, positioning hole; 140, air outlet shell; 141, second connecting plate; 141.1, positioning insertion column; 141.2, second connecting hole; 150, mounting portion; 151, assembly column; 152, insertion slot; 153, insertion column; 153.1, insertion hole; 154, first wire passing slot; 155, second wire passing slot; 156, third wire passing slot; 157, annular mounting piece; 160, flow guide plate; 161, flat plate-shaped flow guide plate; 162, arc plate-shaped flow guide plate;

[0033] 200, airflow pushing assembly; 210, hub; 220, fan blade; 230, flow guide head; 240, flow guide inclined surface;

[0034] 310, flow guide booster column; 311, insertion column; 312, insertion block; 313, wire pressing rod. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme in the utility model will be described clearly and completely below in combination with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0036] The utility model embodiment such as Figures 1-8As shown in the figure, it relates to a fan flow guide structure, comprising a fan duct housing assembly 100, an air flow pushing assembly 200 and a wire assembly, the fan duct housing assembly 100 comprises a detachable connection of an air inlet shell 130 and an air outlet shell 140, the air inlet shell 130 is provided with an air inlet channel 110 penetrating through the opposite ends, the air outlet shell 140 is provided with an air outlet channel 120 penetrating through the opposite ends, the air outlet channel 120 is communicated with the air inlet channel 110, the air inlet shell 130 is provided with a mounting part 150; the air flow pushing assembly 200 is arranged on the mounting part 150 and is used for pushing air from the air inlet channel to the air outlet channel, the air flow pushing assembly 200 comprises a hub 210, fan blades 220 uniformly distributed on the outer peripheral wall of the hub 210 and a rotating driving member for driving the hub 210 to rotate; the wire assembly comprises a first wire passing part penetrating through the mounting part 150 and a second wire passing part communicating the inside and outside of the air inlet shell 130, further, when the utility model is used, the air flow pushing assembly 200 can be started first, the air flow pushing assembly 200 pushes the external air from the air inlet channel 110 to the air outlet channel 120, ensuring that the air is effectively sucked from the air inlet and pushed to the air outlet, the air flow pushing assembly 200 comprises the hub 210, the fan blades 220 and the rotating driving member, which is mounted on the mounting part 150 of the air inlet shell 130, the uniform distribution of the fan blades 220 can maximize the air power efficiency, further, the detachable connection of the air inlet shell 130 and the air outlet shell 140 not only facilitates cleaning but also facilitates better air inlet shell 130 or air outlet shell 140, the wire assembly realizes the communication of the inside and outside of the air inlet shell 130 through the first wire passing part and the second wire passing part, which facilitates the connection of the rotating driving member and the external power supply, so that the power line and the control line can be arranged neatly and safely inside the fan, avoiding the disorderly and dangerous line, in the embodiment, the rotating driving member is a motor.

[0037] In the embodiment, the mounting part 150 comprises a ring-shaped mounting member 157 and an assembly column 151 arranged at one end of the ring-shaped mounting member 157 away from the air outlet shell 140, the hub 210 is rotationally connected to the assembly column 151, the outer peripheral wall of the ring-shaped mounting member 157 is connected to the inner wall of the air inlet shell 130 through a flow guide plate 160, the assembly column 151 provides a stable support point for the hub 210, ensuring that the hub 210 can rotate smoothly and smoothly, the ring-shaped mounting member 157 and the inner wall of the air inlet shell 130 are connected through the flow guide plate 160, which helps to optimize the distribution of air flow, the flow guide plate 160 can guide the air to enter the air outlet channel 120 more uniformly, reducing the vortex and turbulence of the air flow in the air outlet channel 120, thereby improving the heat dissipation efficiency of the fan, specifically, the ring-shaped mounting member 157 is integrally formed with the assembly column 151 and the air deflector.

[0038] Referring toFigures 4-7 In the embodiment, the ring-shaped mounting member 157 is connected with the flow guide booster column 310 penetrating into the air outlet shell 140 through a detachable connecting assembly at one end close to the air outlet shell 140, the detachable connecting assembly comprises a plug-in groove 152 arranged at the one end of the ring-shaped mounting member 157 close to the air outlet shell 140 and a plug-in block 312 arranged at the bottom of the flow guide booster column 310 for plugging into the plug-in groove 152 for plugging, further, when the air flows through the flow guide booster column 310, the air is effectively compressed and accelerated in the air outlet shell 140 through the cooperation of the flow guide booster column 310 and the air outlet shell 140, thereby improving the airflow pressure at the air outlet channel 120 and the air outlet, and the flow guide booster column 310 can also guide the airflow to flow in a specific direction, reduce airflow turbulence and energy loss, thereby improving the heat dissipation efficiency, and since the plug-in groove 152 and the plug-in block 312 are plugged into each other through cooperation, when the fan needs to be cleaned or the flow guide booster column 310 needs to be replaced, only the plug-in block 312 needs to be simply removed, without the need for complex disassembly work, in the embodiment, the plug-in block 312 is in a circular arc shape and is provided with a plurality of plug-in blocks, the cooperation of the plug-in groove 152 and the plug-in block 312 and the hollow plug-in column 153 and the plug-in column 311 makes the connection and disconnection of the flow guide booster column 310 and the mounting portion 150 more rapid and simple, without the need for complex installation steps and tools, and without the need to damage the structure of the air duct shell, thereby reducing the maintenance cost and time cost, in the embodiment, the flow guide booster column 310 is in a conical shape and can effectively guide the airflow flow path in the air duct, reducing airflow turbulence and energy loss.

[0039] Referring to Figures 4-7 In the embodiment, the bottom of the plug-in groove 152 is provided with a plug-in column 153, the plug-in column 153 is provided with a plug-in hole 153.1, the bottom of the flow guide booster column 310 is further provided with a plug-in column 311 which can be plugged into the plug-in hole 153.1 for plugging, through the plugging cooperation of the plug-in column 153 and the plug-in column 311, the tight connection between the flow guide booster column 310 and the ring-shaped mounting member 157 can be achieved, and the positioning during assembly can also be achieved, thereby reducing the assembly difficulty between the flow guide booster column 310 and the ring-shaped mounting member 157.

[0040] Referring to Figures 5-7In the embodiment, one end of the air inlet shell 130 is provided with a first connecting plate 131, four corners of the first connecting plate 131 are provided with first connecting holes 131.1 and positioning holes 131.2, one end of the air outlet shell 140 close to the air inlet shell 130 is provided with a second connecting plate 141, four corners of the second connecting plate 141 are provided with positioning inserting columns 141.1 which can be inserted into the positioning holes 131.2 and second connecting holes 141.2 which are matched with the first connecting holes 131.1, the first connecting holes 131.1 and the second connecting holes 141.2 can be fastened by connecting pieces, when the air inlet shell 130 and the air outlet shell 140 need to be assembled, only need to insert the positioning inserting columns 141.1 into the positioning holes 131.2, then fasten the first connecting holes 131.1 and the second connecting holes 141.2 by the connecting pieces, when the air inlet shell 130 and the air outlet shell 140 need to be disassembled, only need to disengage the connecting pieces from the second connecting holes 141.2, then pull out the positioning inserting columns 141.1 from the positioning holes 131.2, in the embodiment, the positioning holes 131.2 are two and diagonally distributed on the first connecting plate 131, the second connecting holes 141.2 are also two and diagonally distributed on the first connecting plate 131, in the embodiment, the connecting holes are threaded holes and the connecting pieces are bolts.

[0041] Referring to Figures 4-8 In the embodiment, the first wire passing part includes a first wire passing groove 154 which penetrates the top and bottom of the ring-shaped mounting piece 157 and a second wire passing groove 155 which penetrates the outer side wall of the ring-shaped mounting piece 157 and the inserting groove 152, the first wire passing groove 154 and the second wire passing groove 155 are communicated, the second wire passing part includes a third wire passing groove 156 which penetrates the inner side wall and the outer side wall of the air inlet shell 130, further, the first wire passing groove 154 and the second wire passing groove 155 can make the power lines, control lines and other wires of the rotating driving piece pass through the ring-shaped mounting piece 157 in order, avoid the situation that the lines are in disorder, at the same time, the third wire passing groove 156 provides a convenient assembly channel for the wires between the inner side and the outer side of the air inlet shell 130, further ensure that the wiring inside the whole fan flow guiding structure is neat and orderly, and it is convenient for external equipment to provide power for the fan, control the rotating speed of the fan and start and stop the fan.

[0042] Referring to Figures 5-8In the embodiment, the wire assembly includes a wire pressing rod 313 arranged at one end of the air outlet shell 140 close to the air inlet shell 130 for clamping the cables in the second wire slot 155 and the third wire slot 156. The thickness of the wire pressing rod 313 is less than the depth of the second wire slot 155 and the third wire slot 156. Further, the wire pressing rod 313 is designed to effectively clamp the cables in the second wire slot 155 and the third wire slot 156, avoiding the wires from shaking or falling off under the action of air flow. Compared with the traditional binding or pasting method, the method is more reliable, can ensure that the wires remain in a stable connection state during long-term use, and can also make the wires more orderly arranged inside the air duct system, reducing the crossing and entanglement between the wires. The thickness of the wire pressing rod 313 is less than the depth of the wire slot, so that the cables can still maintain a certain degree of freedom after being clamped, which helps to optimize the wiring space and allows more cables to be arranged neatly in the wire slot without mutual pressing or interference.

[0043] Referring to Figures 5-8 In the embodiment, the hub 210 is provided with a flow guide head 230 at the end away from the assembly column 151. The outer peripheral wall of the hub 210 is provided with a flow guide slope 240. The front end of the fan blade 220 and the tail end of the fan blade 220 are twisted and inclined in the circumferential direction towards opposite directions. Further, the presence of the flow guide head 230 can guide the air flow to enter the fan blade 220 area more smoothly, reducing the vortex and turbulence of the air flow at the hub 210, thereby improving the air supply efficiency and heat dissipation performance of the fan. The presence of the flow guide slope 240 can further accelerate the flow of the air flow and make it more uniformly distributed on the fan blade 220. The front end and the tail end of the fan blade 220 are twisted and inclined in the circumferential direction towards opposite directions, which can make the fan blade 220 generate greater lift when rotating, thereby improving the air supply capacity of the fan.

[0044] Referring to Figures 1-7 In the embodiment, the flow guide plate 160 is provided with a plurality of flow guide plates 160 around the annular mounting member 157. The wire pressing rod 313 is opposite to any one of the plurality of flow guide plates 160. The wire pressing rod 313 is opposite to any one of the plurality of flow guide plates 160. The wire pressing rod 313 opposite to the flow guide plate 160 can make the wire pressing rod 313 not affect the air flow in the air duct shell assembly 100100, and also can ensure that the wire pressing rod 313 remains in a stable connection state inside the air duct system, preventing the wires from shaking, and avoiding the wires from falling out of the wire slot due to shaking. In some embodiments, the flow guide plate 160 is provided with two types, one is a flat plate-shaped flow guide plate 161, and the other is an arc-shaped plate-shaped flow guide plate 162.

[0045] In the embodiment, the inner diameter of the air outlet shell 140 gradually decreases from the direction close to the air inlet shell 130 to the direction away from the air inlet shell 130, and the cross-sectional area of the flow guide plenum 310 gradually decreases from the direction close to the air inlet shell 130 to the direction away from the air inlet shell 130. The tapered air duct can accelerate the flow speed of the airflow, increase the pressure and flow rate of the airflow, thereby enhancing the plenum effect. The tapered air duct can further cooperate with the flow guide plenum 310 to further enhance the plenum effect, so that the air pressure at the air outlet of the air outlet passage 120 is increased.

[0046] It should be understood that, for those skilled in the art, improvements or changes can be made according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the utility model.

Claims

1. A fan flow guiding structure, characterized by, The application relates to an air duct shell assembly (100) comprising a detachably connected air inlet shell (130) and an air outlet shell (140), wherein the air inlet shell (130) is provided with an air inlet channel (110) penetrating through opposite ends thereof, the air outlet shell (140) is provided with an air outlet channel (120) penetrating through opposite ends thereof, the air outlet channel (120) is communicated with the air inlet channel (110), and the air inlet shell (130) is provided with a mounting portion (150). The air flow pushing assembly (200) is arranged on the mounting portion (150) and used for pushing air from the air inlet channel (110) to the air outlet channel (120) and then flowing out to an external space, wherein the air flow pushing assembly (200) comprises a hub (210), fan blades (220) uniformly distributed on the outer peripheral wall of the hub (210), and a rotating driving member used for driving the hub (210) to rotate. The wire assembly comprises a first wire passing portion penetrating through the mounting portion (150) and a second wire passing portion communicating the inside and outside of the air inlet shell (130). The mounting portion (150) comprises a ring-shaped mounting member (157) and an assembly column (151) arranged at one end of the ring-shaped mounting member (157) away from the air outlet shell (140), the hub (210) is rotationally connected to the assembly column (151), and the outer peripheral wall of the ring-shaped mounting member (157) is connected to the inner wall of the air inlet shell (130) through a flow guide plate (160).

2. The fan flow guiding structure according to claim 1, wherein One end of the ring-shaped mounting member (157) close to the air outlet shell (140) is connected to a flow guide supercharging column (310) penetrating into the air outlet shell (140) through a detachable connecting assembly, the detachable connecting assembly comprises a plug-in groove (152) arranged at one end of the ring-shaped mounting member (157) close to the air outlet shell (140) and a plug-in block (312) arranged at the bottom of the flow guide supercharging column (310) and used for plugging into the plug-in groove (152).

3. The fan flow guiding structure according to claim 2, wherein The bottom of the plug-in groove (152) is provided with a plug-in column (153), the plug-in column (153) is provided with a plug-in hole (153.1), and the bottom of the flow guide supercharging column (310) is further provided with a plug-in column (311) which can be plugged into the plug-in hole (153.1).

4. The fan flow guiding structure according to claim 3, wherein One end of the air inlet shell (130) is provided with a first connecting plate (131), the four corners of the first connecting plate (131) are provided with a first connecting hole (131.1) and a positioning hole (131.2), one end of the air outlet shell (140) close to the air inlet shell (130) is provided with a second connecting plate (141), the four corners of the second connecting plate (141) are provided with a positioning plug-in column (141.1) which can be plugged into the positioning hole (131.2) and a second connecting hole (141.2) matched with the first connecting hole (131.1), and a connecting member can be fastened and connected by penetrating through the first connecting hole (131.1) and the second connecting hole (141.2).

5. The fan flow guiding structure according to claim 1, wherein ​ 6. The fan flow guiding structure according to claim 3, wherein The first wire passing part comprises a first wire passing groove (154) passing through the top and bottom of the ring-shaped mounting member (157) and a second wire passing groove (155) passing through the plug-in groove (152) and the outer sidewall of the ring-shaped mounting member (157), the first wire passing groove (154) and the second wire passing groove (155) being in communication, the second wire passing part comprises a third wire passing groove (156) passing through the inner and outer sidewalls of the air inlet shell (130).

7. A fan flow guiding structure according to claim 6, wherein The wire assembly comprises a wire pressing rod (313) arranged at one end of the air outlet shell (140) close to the air inlet shell (130) for clamping cables in the second wire passing groove (155) and the third wire passing groove (156), the thickness of the wire pressing rod (313) being less than the depth of the second wire passing groove (155) and the third wire passing groove (156).

8. The fan flow guiding structure according to claim 2, wherein The hub (210) is provided with a flow guide head (230) at one end away from the assembly column (151), the outer peripheral wall of the hub (210) is provided with a flow guide slope (240), and the front end of the fan blade (220) and the tail end of the fan blade (220) are twisted and inclined in the circumferential direction towards opposite directions.

9. The fan flow guiding structure of claim 2, wherein, The flow guide plate (160) is provided with a plurality of flow guide plates (160) around the ring-shaped mounting member (157), and the wire pressing rod (313) is opposite to any one of the plurality of flow guide plates (160).

10. The fan flow guiding structure according to claim 3, wherein The inner diameter of the air outlet shell (140) gradually decreases from the direction close to the air inlet shell (130) to the direction away from the air inlet shell (130), and the cross-sectional area of the flow guide supercharging column (310) gradually decreases from the direction close to the air inlet shell (130) to the direction away from the air inlet shell (130).

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