Super-efficient axial flow fan

Abstract

The utility model provides a super-efficient axial flow fan which comprises a fan barrel and fan blades, the fan blades are arranged in the fan barrel, one end of the fan barrel is a bottom plate, an air inducing hole is formed in the bottom plate, and an air guiding sleeve is fixed to the position, corresponding to the outside of the air inducing hole, of the bottom plate. The fan blades are located in the air guide sleeve in the axial direction of the air guide sleeve. An extension sleeve is further connected outside the air guide sleeve, a grating baffle is installed on the outer end face of the extension sleeve, and a channel for air circulation is formed in the grating baffle. The extension sleeve is lengthened on the air guide sleeve, on one hand, the inner wall of the extension sleeve is used for effectively guiding the airflow direction, and the situation that the heat exchange efficiency is reduced due to direct rotation and backflow of airflow is avoided. And on the other hand, due to the existence of the extension sleeve, the fan blades are farther away from the position of the external port, the requirement for the protection size of the port can be lowered, and on the premise that the protection requirement is met, blocking of the grating baffle to airflow is further reduced, the airflow diffusivity is improved, and the heat exchange effect is further enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of fan production and design, in particular to a super-efficient axial flow fan. Background Art

[0002] An axial flow fan is a type of fan used for local ventilation and ventilation. Existing axial flow fans generally consist of a motor, blades, and a fan barrel. The fan barrel is a cylindrical structure with a base plate at one end. Air inlets are provided on the base plate. The motor and blades are mounted within the barrel. When the motor is running, it rotates the blades, creating an airflow parallel to the blade axis.

[0003] At present, in existing axial flow fans, the fan blades are usually installed at the end of the fan cylinder away from the base plate. The airflow enters from the air duct and passes through the fan blades before being discharged from the other end of the fan cylinder. When the base plate is installed on the machine body or the wall, the gas in the machine body or the wall can be discharged and diffused to the outside of the machine or the wall through the axial flow fan, thereby achieving an effective heat exchange effect. When the axial flow fan is used for heat exchange, since the fan blades are installed at the end of the fan cylinder, there is no special design for guiding the airflow after passing through the fan blades, although there is a tendency for the airflow to continue to extend axially under the action of the fan blades. However, there is still a part of the airflow that escapes circumferentially after passing through the fan blades and the air guide sleeve, and even rotates and refluxes, and re-converges on the outer wall of the air guide sleeve and the outer wall of the base plate, thereby affecting the use effect of the axial flow fan.

[0004] At the same time, in order to effectively protect the operator from being accidentally injured by the blades during the operation of the axial flow fan, a baffle or grille is usually designed for the end of the blade installation. For example, in 2023, our company applied for a utility model with application number 202321157948.9 for a waterproof and dustproof automobile air-conditioning fan. In the drawings of the specification of the utility model, Figure 1 The fan cover in the figure is a conventional baffle. On the one hand, this baffle and grille need to provide a channel for airflow, and on the other hand, the size of the channel needs to be limited to be smaller than the diameter of the operator's finger to ensure that the finger cannot reach into the channel on the baffle or grille.

[0005] This fan guard design limits the size of the airflow channel. However, for axial flow fans, the smaller the baffle or grille, the greater the airflow obstruction. This protective requirement conflicts with the axial fan's wind flow efficiency. To maintain this protection, the fan's power and efficiency are compromised, resulting in losses. Summary of the Invention

[0006] The technical problem to be solved by the present invention is: in order to overcome the deficiencies of the existing technology, the present invention provides an ultra-high-efficiency axial flow fan which can effectively guide the airflow so that it can continue to move along the axial direction of the fan blade, effectively weaken the rotation ability of the airflow, and improve the heat exchange effect.

[0007] The technical solution adopted by the utility model to solve its technical problems is: an ultra-high-efficiency axial flow fan, including a fan cylinder and fan blades, the fan blades are arranged in the fan cylinder, one end of the fan cylinder is a bottom plate, and an air induction hole is opened on the bottom plate, and an air guide sleeve is fixed outside the bottom plate corresponding to the air induction hole; along the axial direction of the air guide sleeve, the fan blades are located in the air guide sleeve; an extension sleeve is also connected to the outside of the air guide sleeve, and a grille baffle is installed on the outer end surface of the extension sleeve, and the grille baffle has a channel for air circulation.

[0008] In the above scheme, in order to address the situation where the original airflow rotates and refluxes after passing through the fan blades, an extended sleeve is designed outside the air guide sleeve. The inner wall of the extended sleeve can guide the airflow after passing through the fan blades, so that it continues to extend forward along the inner wall of the extended sleeve, effectively weakening the rotation of the airflow, avoiding the airflow from flowing back to the outside of the base plate, and further improving the heat exchange capacity of the axial flow fan.

[0009] Furthermore, during the installation of the air guide sleeve and the extension sleeve, the outer end of the air guide sleeve has a flange, and the inner end face of the extension sleeve also has a flange. The flange of the air guide sleeve and the flange of the extension sleeve are fixed by bolts.

[0010] Preferably, the axial length of the extension sleeve is in the range of 250 to 350 mm. This length setting ensures that there is enough space for the airflow to be guided to climb along the inner wall.

[0011] Furthermore, the grille baffle includes a central circular plate and several protective rings with diameters ranging from small to large and distributed concentrically with the central circular plate. There is a gap between two adjacent protective rings, which serves as a channel for air circulation, and the width of the gap is not wide enough for the operator's wrist to penetrate. Based on the length of the extension sleeve, the size restriction of the airflow channel can be relaxed, and it is only required to prevent the wrist from passing through. Because the extension sleeve has a length that is much longer than the length of an average person's palm, even if the operator accidentally inserts his fingers or palm through the channel, the wrist is restricted by the size of the channel, that is, the part of the forearm behind the wrist cannot enter the extension sleeve. The design of the extension sleeve's length ensures that the front end of the finger will not touch the fan blade, and thus will not be injured by the fan blade, playing an effective protective role. The widening of the range of this channel / gap reduces the obstruction of the airflow in axial movement, further improves the diffusion capacity of the airflow, and further enhances the heat exchange effect of the axial flow fan.

[0012] Furthermore, the grille baffle includes a plurality of reinforcing ribs, one end of the reinforcing rib is fixed to the central circular plate, and the other end has a mounting ring and is connected to the end face of the extension sleeve through the mounting ring.

[0013] Furthermore, the reinforcing ribs are radially distributed at equal angles with the center of the central circular plate as the center.

[0014] The beneficial effects of the present invention are that the ultra-high-efficiency axial flow fan provided by the present invention has a rational structural design. The extension sleeve is designed to extend the air guide sleeve. On the one hand, the inner wall of the extension sleeve effectively guides the airflow direction, preventing direct airflow rotation and backflow that would reduce heat exchange efficiency. On the other hand, the presence of the extension sleeve further distances the fan blades from the external port, reducing the size requirements for port protection. While meeting the protection requirements, the grille baffle further reduces airflow obstruction, improves airflow diffusion capacity, and further enhances heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram of the airflow direction of an existing axial flow fan (the direction of the arrow is the airflow direction).

[0018] Figure 3 Schematic diagram of the airflow direction of the embodiment of the present invention (the direction of the arrow is the direction of the airflow).

[0019] In the figure, 1 is the center circular plate 2, the mounting ring 3, the reinforcing rib 4, the protective ring 5, the fan blade 6, the extension sleeve 7, the air guide sleeve 8, and the bottom plate. DETAILED DESCRIPTION

[0020] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating the basic structure of the present invention only in a schematic manner. They therefore only show components relevant to the present invention, and directions and references (e.g., up, down, left, right, etc.) may be used solely to facilitate the description of features in the drawings. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents. Example 1

[0021] like Figure 1 The ultra-high efficiency axial flow fan shown is the first embodiment of the present utility model.

[0022] This ultra-high-efficiency axial flow fan includes a fan cylinder and blades 5. The blades 5 are mounted within the cylinder, which includes a base plate 8 and an air guide sleeve 7 integrally formed with the base plate 8. One end of the fan cylinder is the air induction end. This end is the base plate 8, which has air induction holes formed therein. The air guide sleeve 7 is fixed to the outside of the base plate 8 corresponding to the air induction holes. The axial flow fan's motor and blades 5 are mounted within the air guide sleeve 7. The blades 5 are positioned within the air guide sleeve 7 along its axial direction.

[0023] During installation, the base plate 8 is fixed to the corresponding machine body and chamber requiring heat exchange, with the air guide sleeve 7 positioned outside the machine body and chamber. In this embodiment, to effectively prevent airflow from circulating after exiting the fan blades 5, an extension sleeve 6 is attached to the outside of the air guide sleeve 7. During installation, the air guide sleeve 7 and the extension sleeve 6 have a flange on their outer end and a flange on their inner end. The flanges of the air guide sleeve 7 and the extension sleeve 6 are secured together with bolts.

[0024] The axial length of the extension sleeve 6 is preferably in the range of 250 to 350 mm. The setting of this length ensures that there is enough space for the airflow to be guided to climb along the inner wall.

[0025] In this embodiment, the airflow after passing through the fan blades 5 is further guided by the extended sleeve 6, allowing it to continue climbing forward along the inner wall of the extended sleeve 6. Driven by the subsequent airflow, it will not turn back from the inner wall of the extended sleeve 6. Even if the airflow does turn around at the outer end of the extended sleeve 6, this turning ability is gradually weakened during the climb along the inner wall, and the ability to converge toward the outside of the base plate 8 is reduced. This effectively prevents the airflow from flowing back and converging outside the base plate 8, further improving the heat exchange capacity of the axial flow fan. Example 2

[0026] like Figure 1 The illustrated ultra-high-efficiency axial flow fan is the second embodiment of the present invention. Based on the axial length restrictions on the extension sleeve 6 in the first embodiment, the second embodiment further relaxes the density and size requirements of the grille baffles or protective grilles while ensuring effective protection. This reduces the wind resistance of the grille baffles and grilles, thereby improving the heat exchange efficiency of the axial flow fan.

[0027] The axial length of the extension sleeve 6 is preferably 250-350 mm. This length is much longer than the length of an average person's palm. Even if an operator accidentally inserts their fingers or palm through the channel, the wrist is restricted by the channel size, meaning that the forearm beyond the wrist cannot enter the extension sleeve 6. Therefore, the length of the extension sleeve 6 ensures that the front end of the fingers will not touch the fan blades 5, thereby preventing them from being injured by the fan blades 5, providing effective protection.

[0028] The outer end face of the extension sleeve 6 is provided with a grille baffle having a passage for air circulation. On the basis of the length of the extension sleeve 6, the protection of the outer end port can be relaxed. Only requiring it to prevent the wrist from passing through.

[0029] Specifically, the grille baffle includes a central circular plate 1, a plurality of protective rings 4, and reinforcing ribs 3 distributed at equal angles in a cross-shaped pattern. One end of the reinforcing rib 3 is fixed to the central circular plate 1, and the other end has a mounting ring 2, which is connected to the end face of the extension sleeve 6 through the mounting ring 2. The plurality of diameters range from small to large and are concentrically distributed with the central circular plate 1. There is a gap between two adjacent protective rings 4, which serves as a channel for air circulation, and the width of the gap is not wide enough for the operator's wrist to penetrate. The widening of the range of this channel / gap reduces the obstruction of the airflow in the axial movement, further improves the diffusion capacity of the airflow, and further enhances the heat exchange effect of the axial flow fan.

[0030] In conventional designs, the gap needs to be smaller than the thickness of a finger, while a person's wrist is thicker than a finger. Therefore, the gap in the second embodiment can be larger than the conventional design, thereby achieving the effect of reducing obstruction at the grille baffle position.

[0031] In actual gap parameter design, the design is typically based on the average thickness of an average person's wrist. Thin fingers are generally over 1 cm thick, and wrists are over 3 cm thick. In this embodiment, the gap between adjacent metal rings can be set to 3 cm. Compared to a 1 cm gap, this creates less obstruction to airflow and improves the cooling effect of the axial fan.

[0032] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. An ultra-high efficiency axial flow fan, comprising a fan barrel and fan blades (5), wherein the fan blades (5) are arranged in the fan barrel, and characterized in that: One end of the fan cylinder is a bottom plate (8), which is provided with an air induction hole. An air guide sleeve (7) is fixed outside the bottom plate (8) corresponding to the air induction hole. Along the axial direction of the air guide sleeve (7), the fan blade (5) is located inside the air guide sleeve (7). The air guide sleeve (7) is further connected to an extension sleeve (6), and a grille baffle is installed on the outer end surface of the extension sleeve (6), and the grille baffle has a channel for air circulation.

2. The ultra-high efficiency axial flow fan according to claim 1, wherein: The outer end of the air guide sleeve (7) has a flange, and the inner end surface of the extension sleeve (6) also has a flange. The flange of the air guide sleeve (7) and the flange of the extension sleeve (6) are fixed by bolts.

3. The ultra-high efficiency axial flow fan according to claim 1, wherein: The axial length of the extension sleeve (6) is in the range of 250 to 350 mm.

4. The ultra-high efficiency axial flow fan according to claim 3, wherein: The grille baffle comprises a central circular plate (1) and a plurality of protective rings (4) with diameters ranging from small to large and concentrically distributed with the central circular plate (1). A gap is provided between two adjacent protective rings (4), the gap being a passage for air circulation, and the width of the gap is not wide enough for an operator's wrist to penetrate.

5. The ultra-high efficiency axial flow fan according to claim 4, characterized in that: The grille baffle comprises a plurality of reinforcing ribs (3), one end of the reinforcing rib (3) is fixed to the central circular plate (1), and the other end has a mounting ring (2) and is connected to the end face of the extension sleeve (6) through the mounting ring (2).

6. The ultra-high efficiency axial flow fan according to claim 5, characterized in that: The reinforcing ribs (3) are radially distributed at equal angles with the center of the central circular plate (1) as the center.

Images