Multifunctional fan and multifunctional air supply system

Abstract

The invention provides a multifunctional fan and a multifunctional air supply system, and the multifunctional fan comprises a backward centrifugal fan part, an axial flow fan part and a transmission shaft. The backward centrifugal fan part comprises a bottom disc, a flow guide ring and a plurality of centrifugal fan blades arranged between the bottom disc and the flow guide ring. The axial flow fan part is located among the centrifugal fan blades and comprises a boss and a plurality of axial flow fan blades arranged on the boss; the transmission shaft, the backward centrifugal fan part and the axial flow fan part are coaxially arranged, a first fastening knob is arranged between the bottom disc and the transmission shaft, a second fastening knob is arranged between the boss and the transmission shaft, and the first fastening knob and the second fastening knob can adjust the bottom disc and the boss to be separated from or fixed to the transmission shaft. According to the scheme, diversified air supply modes of the air supply system can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of air supply systems, and particularly to a multifunctional fan and a multifunctional air supply system. Background Art

[0002] From the initial manual fanning to the later electric fans and then to the current air conditioner indoor unit systems, the technology of fans has been continuously developing and progressing.

[0003] Currently, for the air supply systems used in air conditioner indoor unit systems installed in places such as offices and shopping malls, most of them use conventional centrifugal fans or axial flow fans for blowing air for cooling and heating. The air flow form of the axial flow fan is laminar flow, which is characterized by large flow rate and small volume. However, due to its small air volume and low air pressure, it is inadequate for scenarios that require larger air volume and higher air pressure. While the centrifugal fan can generate a stable high-pressure air flow, the amount of air it moves is less.

[0004] Obviously, with the development of technology and the improvement of user requirements, due to the single function of the existing fans, the existing air supply systems can no longer meet the diverse needs. Summary of the Invention

[0005] The present invention provides a multifunctional fan and a multifunctional air supply system to solve the defect of the single function of the fan in the existing air supply system and achieve diverse air supply modes of the air supply system.

[0006] The present invention provides a multifunctional fan, including: a backward centrifugal fan part, including a bottom disc, a guide ring, and a plurality of centrifugal fan blades arranged between the bottom disc and the guide ring; an axial flow fan part, located between the plurality of centrifugal fan blades, the axial flow fan part including a boss and a plurality of axial flow fan blades arranged on the boss; a transmission shaft, coaxially arranged with the backward centrifugal fan part and the axial flow fan part, a first fastening knob is arranged between the bottom disc and the transmission shaft, a second fastening knob is arranged between the boss and the transmission shaft, and the first fastening knob and the second fastening knob can respectively adjust the bottom disc and the boss to be detached from or fixed to the transmission shaft.

[0007] According to the multifunctional fan provided by the present invention, the guide ring has an outer peripheral edge and an inner peripheral edge; the distance between the inner peripheral edge and the bottom disc is greater than the distance between the outer peripheral edge and the bottom disc, and an inwardly concave arc surface is formed between the outer peripheral edge and the inner peripheral edge.

[0008] According to the multifunctional fan provided by the present invention, the ratio of the diameter of the inner peripheral edge to the diameter of the outer peripheral edge is 0.75 to 0.9.

[0009] A multi-functional fan provided by the present invention, wherein a pointed structure is provided at the top of the inner side of the centrifugal fan blade; the ratio of the distance between the pointed structure and the bottom disc to the distance between the inner circumference and the bottom disc is 0.65 to 0.8.

[0010] A multi-functional fan provided by the present invention, wherein the boss includes a conical cover and a top frustum; the wide-angle side of the conical cover faces the bottom disc; the axial flow fan blades are arranged on the conical cover, and ventilation holes are provided on the conical cover between adjacent axial flow fan blades.

[0011] A multi-functional fan provided by the present invention, wherein the ratio of the distance between the top frustum and the bottom disc to the distance between the inner circumference and the bottom disc is 1 / 2 to 2 / 3.

[0012] A multi-functional fan provided by the present invention, wherein the outer diameter of the multiple axial flow fan blades is smaller than the inner diameter of the multiple centrifugal fan blades, and the difference between the two is greater than or equal to 10 millimeters.

[0013] A multi-functional fan provided by the present invention, wherein in the backward centrifugal fan part, the number of centrifugal fan blades is odd; and / or, in the axial flow fan part, the number of axial flow fan blades is odd.

[0014] The present invention also provides a multi-functional air supply system, including a driving motor and the multi-functional fan according to any one of the above embodiments.

[0015] A multi-functional air supply system provided by the present invention, wherein the driving motor is a reversible motor, and the reversible motor has a forward driving mode and a reverse driving mode with opposite driving directions.

[0016] The multi-functional fan provided by the present invention includes a backward centrifugal fan part, an axial flow fan part and a transmission shaft. Through the first fastening knob and the second fastening knob, either or both of the backward centrifugal fan part and the axial flow fan part can be in transmission cooperation with the transmission shaft, so that in different transmission cooperation states, multiple air supply modes of the multi-functional fan can be realized.

[0017] When one of the first fastening knob and the second fastening knob is locked and the other is unlocked, the axial flow fan function or the backward centrifugal fan function can be provided by the multi-functional fan. When both the first fastening knob and the second fastening knob are locked, the axial flow fan part and the backward centrifugal fan part work simultaneously, and a larger air flow can be formed, thereby combining the advantages of the axial flow fan and the backward centrifugal fan to provide a stronger air supply effect.

[0018] The multi-functional air supply system provided by the present invention adopts the above multi-functional fan and can realize diversified air supply modes of the air supply system. Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 One of the structural schematic diagrams of the multi-functional air supply system provided by the present invention;

[0021] Figure 2 The structural schematic diagram of the multi-functional fan provided by the present invention;

[0022] Figure 3 One of the structural schematic diagrams of the backward centrifugal fan part of the multi-functional fan provided by the present invention;

[0023] Figure 4 Another structural schematic diagram of the backward centrifugal fan part of the multi-functional fan provided by the present invention;

[0024] Figure 5 The structural schematic diagram of the axial flow fan part of the multi-functional fan provided by the present invention;

[0025] Figure 6 The structural schematic diagram of the drive motor and the transmission shaft of the multi-functional air supply system provided by the present invention;

[0026] Figure 7 Another structural schematic diagram of the multi-functional air supply system provided by the present invention;

[0027] Reference Signs:

[0028] 110, bottom disc; 120, guide ring; 121, outer peripheral edge; 122, inner peripheral edge; 130, centrifugal fan blade; 131, pointed corner structure; 210, boss; 211, conical cover; 212, top frustum; 213, ventilation hole; 220, axial flow fan blade; 300, transmission shaft; 310, first fastening knob; 320, second fastening knob; 400, drive motor. Detailed Description of the Embodiments

[0029] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0030] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0031] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0032] In the embodiments of the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0033] The following Figures 1-7 describes the specific embodiments of the multi-functional fan and the multi-functional air supply system of the present invention.

[0034] As Figure 1 and Figure 2 shown, the present invention provides a multi-functional fan, including a backward centrifugal fan part, an axial flow fan part and a transmission shaft 300. Among them, as Figure 3 and Figure 4 shown, the backward centrifugal fan part includes a bottom disc 110, a guide ring 120 and a plurality of centrifugal fan blades 130 arranged between the bottom disc 110 and the guide ring 120. The axial flow fan part is located between the plurality of centrifugal fan blades 130, as Figure 5As shown in the figure, the axial flow fan part includes a boss 210 and a plurality of axial flow fan blades 220 arranged on the boss 210. The drive shaft 300 is coaxially arranged with the backward centrifugal fan part and the axial flow fan part. A first fastening knob 310 is arranged between the bottom disc 110 and the drive shaft 300, and a second fastening knob 320 is arranged between the boss 210 and the drive shaft 300. The first fastening knob 310 and the second fastening knob 320 can respectively adjust the bottom disc 110 and the boss 210 to be disengaged from or fixed to the drive shaft 300. This embodiment provides an implementation manner integrating a backward centrifugal fan part, an axial flow fan part and a drive shaft 300, which can realize multiple air supply modes through flexible adjustment methods to meet different usage requirements.

[0035] Specifically, the bottom disc 110 of the backward centrifugal fan part is the installation base during its transmission cooperation with the drive shaft 300, and the guide ring 120 helps to guide the air flow in the correct direction. A plurality of centrifugal fan blades 130 are arranged between the bottom disc 110 and the guide ring 120, forming a centrifugal fan structure capable of radially entering or releasing air. The axial flow fan part is located between the plurality of centrifugal fan blades 130 and includes a boss 210 and a plurality of axial flow fan blades 220 arranged on the boss 210. When the axial flow fan rotates forward, it can provide a directional air flow toward one side of the guide ring 120. The drive shaft 300 is coaxially arranged with the backward centrifugal fan part and the axial flow fan part. A first fastening knob 310 is arranged between the bottom disc 110 and the drive shaft 300, and a second fastening knob 320 is arranged between the boss 210 and the drive shaft 300. The first fastening knob 310 and the second fastening knob 320 can respectively adjust the bottom disc 110 and the boss 210 to be disengaged from or fixed to the drive shaft 300. This design enables users to choose to use only the backward centrifugal fan, or only the axial flow fan, or both at the same time according to needs. During use, in the face of a complex application environment, the multi-functional fan improves the air supply capacity with lower cost and smaller space, realizing a diversified air supply mode of the air supply system.

[0036] Among them, the diameter size of the bottom disc 110 can be set according to the usage requirements, and the sizes of the structures of the remaining components can be adjusted accordingly according to the size of the bottom disc 110. The bottom disc 110 and the boss 210 are preferably both provided with reserved holes, and the hole diameter size of the reserved holes is at least larger than the diameter of the drive shaft 300 to allow the drive shaft 300 to pass through. The first fastening knob 310 and the second fastening knob 320 are respectively arranged between the reserved holes of the bottom disc 110 and the boss 210 and the drive shaft 300, and can be installed on the bottom disc 110 and the boss 210 to move toward the center to clamp the drive shaft 300, or arranged on the drive shaft 300 to move toward the periphery to be fixed to the reserved holes.

[0037] When one of the first fastening knob 310 and the second fastening knob 320 is locked and the other is unlocked, the multi-functional fan can provide an axial flow fan function or a backward centrifugal fan function. When both the first fastening knob 310 and the second fastening knob 320 are locked, while the axial flow fan part rotates to supply air, the backward centrifugal fan draws in the surrounding air to help form a larger air flow. This design combines the advantages of the axial flow fan and the backward centrifugal fan to provide a more powerful air supply effect. It can be understood that when the transmission shaft 300 cooperates with the driving device, the multi-functional fan can not only rotate forward but also rotate backward. Through different rotation direction controls and in combination with the adjustment of the locking states of the first fastening knob 310 and the second fastening knob 320, more application modes of the multi-functional fan can be achieved.

[0038] The first fastening knob 310 and the second fastening knob 320 can be controlled and adjusted through the cooperation of the driving device and the transmission device, or can also be directly adjusted manually. The first fastening knob 310 and the second fastening knob 320 can adopt the following structural forms to achieve the locking and unlocking functions: Rotary fastening knob, by rotating the fastening knob to adjust the contact force between it and the transmission shaft 300, thus achieving the locking and unlocking functions. For example, rotating the fastening knob clockwise to disengage it from the transmission shaft 300 to achieve unlocking; rotating the fastening knob counterclockwise to make it contact with the transmission shaft 300 to achieve locking. Sliding fastening knob, by sliding the fastening knob to adjust the contact force between it and the transmission shaft 300, thus achieving the locking and unlocking functions. For example, sliding the fastening knob to the left to disengage it from the transmission shaft 300 to achieve unlocking; sliding the fastening knob to the right to make it contact with the transmission shaft 300 to achieve locking. Spring-type fastening knob, by setting a spring to adjust the contact force between the fastening knob and the transmission shaft 300, thus achieving the locking and unlocking functions. For example, when the spring is in a compressed state, the fastening knob contacts the transmission shaft 300 to achieve locking; when the spring is in a relaxed state, the fastening knob disengages from the transmission shaft 300 to achieve unlocking. Snap-type fastening knob, by setting a snap to adjust the contact force between the fastening knob and the transmission shaft 300, thus achieving the locking and unlocking functions. For example, inserting the snap into the corresponding hole position to make the fastening knob contact the transmission shaft 300 to achieve locking; pulling out the snap from the hole position to make the fastening knob disengage from the transmission shaft 300 to achieve unlocking.

[0039] Such as Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, a multifunctional fan provided according to the present invention, the flow guide ring 120 has an outer peripheral edge 121 and an inner peripheral edge 122; the distance between the inner peripheral edge 122 and the bottom disc 110 is greater than the distance between the outer peripheral edge 121 and the bottom disc 110, and a concave arc surface is formed between the outer peripheral edge 121 and the inner peripheral edge 122. Specifically, this embodiment provides an implementation manner of the shape design of the flow guide ring 120. A concave arc surface is formed between the outer peripheral edge 121 and the inner peripheral edge 122 of the flow guide ring 120, so that an arc-shaped flow guide structure capable of providing air flow guiding between the axial direction and the radial direction of the backward centrifugal fan part is formed inside the flow guide ring 120. Preferably, the ratio of the diameter of the inner peripheral edge 122 to the diameter of the outer peripheral edge 121 of the above-mentioned flow guide ring 120 is 0.75 to 0.9, which can play a certain pressurizing effect on the axially output air flow while playing the role of air flow guiding.

[0040] The shape of the centrifugal fan blade 130 of the above-mentioned backward centrifugal fan part is preferably a thin and curved design, similar to the airfoil of an airplane. This design enables the centrifugal fan blade 130 to generate a greater air flow when rotating, thereby improving the working efficiency of the backward centrifugal fan part. The shape of the centrifugal fan blade 130 is preferably symmetrical, with a thicker center part and gradually thinning towards the edge, forming a smooth curve. In addition, the edge of the fan blade can be provided with a certain arc to reduce the resistance of the air flow.

[0041] As Figure 1 and Figure 3 As shown, a multifunctional fan provided according to the present invention, a pointed corner structure 131 is preferably provided at the top of the inner side of the centrifugal fan blade 130 to improve the air breaking performance. Preferably, the ratio of the distance between the pointed corner structure 131 and the bottom disc 110 to the distance between the inner peripheral edge 122 and the bottom disc 110 is 0.65 to 0.8, which not only increases the action range of the centrifugal fan blade 130 through the pointed corner structure 131, but also forms a protection above the centrifugal fan blade 130 through the flow guide ring 120, improving the performance and reliability of the equipment.

[0042] The axial flow fan part can be columnar, or preferably as Figure 2 and Figure 5 As shown, a multifunctional fan provided according to the present invention, the boss 210 includes a conical cover 211 and a top frustum 212. Among them, the wide-angle side of the conical cover 211 faces the bottom disc 110, and the axial flow fan blade 220 is arranged on the conical cover 211. Through the outer surface of the conical cover 211, air flow guiding can be provided between the radial direction and the axial direction of the backward centrifugal fan part. Specifically, when air flows between the centrifugal fan blade 130 and the inner peripheral edge 122 of the flow guide ring 120, the outer surface of the conical cover 211 can help the air flow to turn. By combining the conical cover 211 and the arc-shaped flow guide structure of the above-mentioned flow guide ring 120, the resistance received by the air when turning can be effectively reduced.

[0043] Further, between adjacent axial flow fan blades 220, the conical cover 211 is preferably provided with ventilation holes 213. The ventilation holes 213 can communicate the inside and outside of the boss 210. Inside the boss 210, there is a gap between the reserved hole of the bottom disc 110 of the backward centrifugal fan part and the transmission shaft 300. Thus, when the backward centrifugal fan part and / or the axial flow fan part is driven to operate, the air on the back side of the bottom disc 110 can also be induced, thereby increasing the air circulation volume between the backward centrifugal fan part and the axial flow fan part. Especially when the axial flow fan part is blowing air, the air output can be increased. On the other hand, when the drive motor 400 is arranged on the back side of the bottom disc 110, the air flowing through the ventilation holes 213 and the reserved holes of the bottom disc 110 can help the drive motor 400 dissipate heat. Preferably, the diameter of the ventilation holes 213 is not less than 20 mm.

[0044] According to a multi-functional fan provided by the present invention, the ratio of the distance between the top frustum 212 of the boss 210 and the bottom disc 110 to the distance between the inner peripheral edge 122 and the bottom disc 110 is 1 / 2 to 2 / 3. That is to say, the maximum height of the axial flow fan part is not higher than the guide ring 120, so that the entire axial flow fan part is hidden inside the backward centrifugal fan part, and its height has little influence on the air circulation volume at the center of the guide ring 120.

[0045] The shape of the axial flow fan blades 220 of the axial flow fan part can adopt a streamline design to minimize the air flow resistance to the greatest extent, so as to improve the fan efficiency. Preferably, the axial flow fan blades 220 are propeller-type fan blades. The size of the blades will also affect the air volume and air speed. Generally, the larger the blades, the greater the air volume.

[0046] As Figure 2 shown, according to a multi-functional fan provided by the present invention, the outer diameter of multiple axial flow fan blades 220 is smaller than the inner diameter of multiple centrifugal fan blades 130, and the difference between the two is preferably greater than or equal to 10 mm to prevent the two fan blades from contacting and rubbing.

[0047] According to a multi-functional fan provided by the present invention, in the backward centrifugal fan part, the number of centrifugal fan blades 130 is odd; and / or, in the axial flow fan part, the number of axial flow fan blades 220 is odd. In order to optimize the performance, setting the number of blades to an odd number can more easily correct the rotation center during dynamic balance correction and reduce the manufacturing difficulty of the multi-functional fan. According to a preferred embodiment of the present invention, the number of centrifugal fan blades 130 and / or the number of axial flow fan blades 220 is set to 7.

[0048] Based on the above various embodiments, the present invention further provides a multi-functional air supply system, including a driving motor 400 and the multi-functional fan of any one of the above embodiments. As Figure 6 and Figure 7 shown, the driving motor 400 is in adjustable transmission cooperation with the axial flow fan part and the backward centrifugal fan part through a transmission shaft 300. By the first fastening knob 310 and the second fastening knob 320, the bottom disc 110 and the boss 210 can be respectively adjusted to be disengaged from or fixed to the transmission shaft 300, so that the multi-functional air supply system can, according to needs, choose to use only the backward centrifugal fan, or only the axial flow fan, or use both at the same time, thereby realizing diversified air supply modes.

[0049] According to a multi-functional air supply system provided by the present invention, the driving motor 400 is preferably a reversible motor, and the reversible motor has a forward rotation driving mode and a reverse rotation driving mode with opposite driving directions, and can drive the axial flow fan part and / or the backward centrifugal fan part to rotate clockwise or counterclockwise according to different needs.

[0050] Specifically, the multi-functional air supply system controls different switches through a controller to achieve different air supply requirements. The rotation direction of the driving motor 400 (i.e., the reversible motor) is based on Figure 2 the product angle shown, and has two directions: clockwise and counterclockwise. The specific control methods at least include the following:

[0051] 1. The first fastening knob 310 is locked, the second fastening knob 320 is unlocked, the rotation direction is set to counterclockwise, the multi-functional air supply system starts the radial air outlet mode, the backward centrifugal fan part rotates counterclockwise, and the multi-functional air supply system blows air out radially.

[0052] 2. The second fastening knob 320 is locked, the first fastening knob 310 is unlocked, the rotation direction is set to counterclockwise, the multi-functional air supply system starts the axial air inlet mode, the axial flow fan part rotates counterclockwise, and the multi-functional air supply system sucks air in axially (through the flow guide ring 120).

[0053] 3. The first fastening knob 310 is locked, the second fastening knob 320 is locked, the rotation direction is set to counterclockwise, the air supply system starts the strong radial air outlet mode, sucks air in axially (through the flow guide ring 120), and blows out strong air radially.

[0054] 4. The first fastening knob 310 is locked, the second fastening knob 320 is unlocked, the rotation direction is set to clockwise, the air supply system starts the radial air inlet mode, and introduces air through the rotation of the backward centrifugal fan part.

[0055] 5. The first fastening knob 310 is unlocked, the second fastening knob 320 is locked, the rotation direction is set to clockwise, the air supply system starts the axial air outlet mode, and air is sent out through the rotation of the axial flow fan part and the guide ring 120.

[0056] 6. The first fastening knob 310 is locked, the second fastening knob 320 is locked, the rotation direction is set to clockwise, the air supply system starts the strong axial air outlet mode, and through the cooperation between the two fans, air is introduced radially and strong air is sent out axially (through the guide ring 120).

[0057] The multifunctional air supply system according to the present invention can be applied to a variety of application scenarios, such as the indoor unit system of air conditioners and fresh air systems installed in places such as offices and shopping malls. The multifunctional fan and the multifunctional air supply system have diverse uses and functions. By controlling signals to control the operation of different parts, different usage environment purposes can be achieved. At the same output power, due to the combination of the advantages of axial flow fans and centrifugal fans, the air volume of the multifunctional air supply system is further improved compared with traditional fans. Without increasing power and noise, the air volume of the fan is increased, thereby improving the overall capacity of the indoor unit system of the air conditioner or the fresh air system. The multifunctional fan and the multifunctional air supply system of the present invention are easy to install and have low costs. The fan combination installation method is simple. Different components can be adjusted through the knob buckle, which is convenient for control and operation. At the same time, a single motor can drive different fans to operate, saving the motor cost.

[0058] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-functional fan, characterized in that, Comprising: A backward centrifugal fan section, including a bottom disc (110), a guide ring (120), and a plurality of centrifugal fan blades (130) disposed between the bottom disc (110) and the guide ring (120); An axial flow fan section, located between the plurality of centrifugal fan blades (130), the axial flow fan section including a boss (210) and a plurality of axial flow fan blades (220) disposed on the boss (210); A transmission shaft (300), coaxially arranged with the backward centrifugal fan section and the axial flow fan section, a first fastening knob (310) is disposed between the bottom disc (110) and the transmission shaft (300), a second fastening knob (320) is disposed between the boss (210) and the transmission shaft (300), and the first fastening knob (310) and the second fastening knob (320) can respectively adjust the bottom disc (110) and the boss (210) to disengage from or be fixed to the transmission shaft (300).

2. The multi-functional fan according to claim 1, characterized in that, The guide ring (120) has an outer peripheral edge (121) and an inner peripheral edge (122); The distance between the inner peripheral edge (122) and the bottom disc (110) is greater than the distance between the outer peripheral edge (121) and the bottom disc (110), and an inwardly concave arc surface is formed between the outer peripheral edge (121) and the inner peripheral edge (122).

3. The multi-functional fan according to claim 2, characterized in that, The ratio of the diameter of the inner peripheral edge (122) to the diameter of the outer peripheral edge (121) is 0.75 to 0.

9.

4. The multi-functional fan according to claim 2, characterized in that, A pointed corner structure (131) is provided at the top of the inner side of the centrifugal fan blade (130); The ratio of the distance between the pointed corner structure (131) and the bottom disc (110) to the distance between the inner peripheral edge (122) and the bottom disc (110) is 0.65 to 0.

8.

5. The multi-functional fan according to claim 2, characterized in that, The boss (210) includes a conical cover (211) and a top frustum (212); The wide-angle side of the conical cover (211) faces the bottom disc (110); The axial flow fan blades (220) are disposed on the conical cover (211), and ventilation holes (213) are provided on the conical cover (211) between adjacent axial flow fan blades (220).

6. The multi-functional fan according to claim 5, characterized in that, The ratio of the distance between the top frustum (212) and the bottom disc (110) to the distance between the inner peripheral edge (122) and the bottom disc (110) is 1 / 2 to 2 / 3.

7. The multi-functional fan according to claim 5, characterized in that, The outer diameter of the plurality of axial flow fan blades (220) is smaller than the inner diameter of the plurality of centrifugal fan blades (130), and the difference between the two is greater than or equal to 10 millimeters.

8. The multi-functional fan according to any one of claims 1-7, characterized in that, In the backward centrifugal fan section, the number of the centrifugal fan blades (130) is odd; And / or, in the axial flow fan section, the number of the axial flow fan blades (220) is odd.

9. A multi-functional air supply system, characterized in that, Including a drive motor (400) and the multifunctional fan according to any one of claims 1-8.

10. The multi-functional air supply system according to claim 9, characterized in that, The drive motor (400) is a reversible motor, and the reversible motor has a forward drive mode and a reverse drive mode with opposite drive directions.

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