A type of blower with spiral air outlet

Abstract

This utility model belongs to the field of blower technology and discloses a spiral air outlet blower, which includes a housing, an air inlet, an air outlet, and a drive device. The housing has an L-shaped integrated air duct structure, which forms a 90-degree turn from the air inlet to the air outlet, and the air inlet and air outlet are spatially staggered. The air outlet includes a nozzle, a left air duct, and a right air duct. The axis of the left air duct outlet is inclined downward at 45°, and the axis of the right air duct outlet is inclined downward at 50°, forming an arc-shaped cross air curtain. The fan blade assembly includes no less than 9 arc-shaped blades. This utility model reduces the energy loss when the airflow turns 90° by 42% through the L-shaped integrated air duct. Combined with the arc-shaped cross air curtain formed by the left and right air ducts, the measured air curtain coverage angle is adjustable from 60° to 120°, which is 80% higher than the traditional design. In addition, the nozzle is cut at 25° to form a stable spiral air column, which effectively prolongs the airflow effect.

Description

Technical Field

[0001] This utility model relates to the field of blower technology, and in particular to a blower with spiral air outlet. Background Technology

[0002] Traditional blowers generally use a straight-through duct design, with airflow output in a single direction, which has the following technical drawbacks:

[0003] Conventional air outlets have a simple structure, making it difficult to form a wide-angle diffused air curtain, resulting in a narrow effective area. This makes them unsuitable for scenarios requiring three-dimensional coverage (such as industrial dust removal and environmental temperature control). Airflow in straight ducts is prone to turbulence and boundary layer separation. Actual measurements show that the efficiency of traditionally designed ducts is only 55%-65%, resulting in low energy conversion rates.

[0004] High-speed airflow directly impacts the duct wall, generating high-frequency noise. Existing noise reduction filters mostly use homogeneous pore structures, making it difficult to balance noise reduction and air intake efficiency. Ordinary blade designs cannot guide airflow into a spiral motion, resulting in rapid airflow attenuation, short effective distance, and inability to adapt to the airflow distribution requirements of complex spaces. Utility Model Content

[0005] The main objective of this invention is to provide a spiral-discharge blower, aiming to solve the problem that conventional air outlet structures are simple and difficult to form a wide-angle diffusion air curtain, resulting in a narrow effective area, especially in scenarios requiring three-dimensional coverage (such as industrial dust removal and environmental temperature control). Airflow in straight ducts is prone to turbulence and boundary layer separation; actual measurements show that the efficiency of traditional duct designs is only 55%-65%, resulting in low energy conversion rates.

[0006] To achieve the above-mentioned utility model objectives, the first aspect of this utility model proposes a spiral air outlet blower, including a housing, an air inlet, an air outlet and a driving device. The housing is provided with an L-shaped integrated air duct structure. The L-shaped integrated air duct structure has a 90-degree turn from the air inlet to the air outlet, and the air inlet and the air outlet are spatially staggered.

[0007] The air outlet includes a nozzle, a left air duct, and a right air duct. The axis of the left air duct outlet is inclined downward at 45°, and the axis of the right air duct outlet is inclined downward at 50°, forming an arc-shaped cross air curtain.

[0008] The fan blade assembly includes no fewer than nine curved blades.

[0009] Furthermore, the nozzle is angled, with its axis forming an angle of 10°-30° with the direction after the duct turns, so as to guide the airflow to spiral out.

[0010] Furthermore, the flow distribution ratio between the left and right air ducts is 1:1.05-1.15, and the intersection angle of the axes of the two air ducts is 85°-95°.

[0011] Furthermore, the blade mounting angle of the fan blade assembly varies non-linearly along the radial direction.

[0012] Furthermore, the inner wall of the L-shaped integrated air duct structure is provided with guide ribs, which are evenly distributed along the turning point of the L-shaped integrated air duct structure to reduce airflow turbulence.

[0013] Furthermore, the drive device includes a brushless motor, which is linked to the flow rate of the nozzle, left air duct, and right air duct via a speed control module.

[0014] Furthermore, the tilt angle of the arc-shaped blades of the fan blade assembly is consistent with the airflow direction to enhance the spiral airflow effect.

[0015] Furthermore, a noise-reducing filter is provided at the air inlet of the housing, and the pore density of the noise-reducing filter is 20-40 PPI, which is used to reduce airflow noise.

[0016] Furthermore, the inner diameter of the L-shaped integrated air duct structure gradually decreases at the turning point, with a shrinkage ratio of 1:0.8 to 1:0.6, in order to improve the airflow acceleration efficiency.

[0017] Furthermore, the surface of the arc-shaped blades of the fan blade assembly is provided with a nanoscale biomimetic shark skin texture structure.

[0018] Beneficial effects:

[0019] 1. The L-shaped integrated airflow reduces energy loss by 42% when the airflow turns 90°. Combined with the left and right air ducts, it forms an arc-shaped cross air curtain. The measured air curtain coverage angle is adjustable from 60° to 120°, which is 80% better than the traditional design. In addition, the nozzle is cut at 25° to form a stable spiral air column, which effectively prolongs the airflow effect.

[0020] 2. By using a fan blade assembly with a duct contraction ratio of 1:0.625, the airflow acceleration efficiency is increased by 35%, and the overall energy efficiency ratio reaches 82%, saving 18%-22% more energy than similar products. The PID linkage control of the brushless motor and flow sensor matches the speed and duct opening in real time, reducing flow fluctuations.

[0021] 3. A three-layer composite noise-reducing filter lowers intake noise while maintaining an intake efficiency of over 95%. Simultaneously, the biomimetic sharkskin texture on the fan blade surface reduces airflow stripping noise, and combined with the L-shaped air duct guide design, the overall operating noise is ≤65dB(A). Attached Figure Description

[0022] Figure 1This is a schematic diagram of a spiral air outlet blower structure according to an embodiment of the present invention;

[0023] Figure 2 These are the velocity streamline diagrams of the air duct after modification and before modification in the prior art;

[0024] Figure 3 This is a velocity vector diagram of the air duct after modification and before modification in the prior art;

[0025] Figure 4 This is a comparison of the modified air duct velocity cloud map in this utility model with the original air duct velocity cloud map in the prior art.

[0026] in:

[0027] 1. Housing; 2. Air inlet; 31. Left air duct; 32. Right air duct; 4. Nozzle; 5. Fan blade assembly.

[0028] 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

[0029] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly and specifically defined.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] Reference Figures 1-4 An embodiment of this utility model provides a spiral air outlet blower, including a housing 1, an air inlet 2, an air outlet, and a driving device, characterized in that:

[0034] The housing 1 is provided with an L-shaped integrated air duct structure. The L-shaped integrated air duct structure has a 90-degree turn from the air inlet 2 to the air outlet, and the air inlet 2 and the air outlet are spatially staggered.

[0035] The air outlet includes a nozzle 4, a left air duct 31 and a right air duct 32. The air outlet axis of the left air duct 31 is inclined downward at 45°, and the air outlet axis of the right air duct 32 is inclined downward at 50°, forming an arc-shaped cross air curtain.

[0036] The fan blade assembly 5 includes no fewer than nine arc-shaped blades. The inner diameter of the L-shaped integrated air duct structure gradually decreases at the turning point, with a contraction ratio of 1:0.8 to 1:0.6, to improve airflow acceleration efficiency.

[0037] In this embodiment, the blower housing 1 is preferably made of ABS engineering plastic injection molding, and is divided into two parts: a front housing and a rear housing, which are connected by a combination of clips and screws. The interior of housing 1 forms an L-shaped integrated air duct structure, with the air inlet 2 located on the side of housing 1 and the air outlet located at the top, achieving a 90° spatial bend. The axis of the air inlet 2 is vertically offset from the plane of the air outlet by more than 30mm. The inner diameter of the air duct at the bend gradually decreases from 80mm at the inlet end to 50mm at the outlet end, with a shrinkage ratio of 1:0.625. Six trapezoidal cross-section guide ribs are evenly distributed on the inner wall, with a height of 2mm and a spacing of 15°, effectively reducing airflow separation.

[0038] Optionally, the nozzle 4 is angled, with its axis forming an angle of 10°-30° with the direction after the duct bend, to guide the airflow spiral outward. The nozzle 4 adopts a 30° oblique cut design, with its axis forming a 25° angle with the direction of the main duct, and a spiral guide grid is provided at the outlet.

[0039] The flow distribution ratio between the left air duct 31 and the right air duct 32 is 1:1.05-1.15, and the intersection angle of the two air duct axes is 85°-95°. The left air duct 31 and the right air duct 32 adopt a gradually narrowing flow channel structure. The outlet axis of the left air duct 31 is inclined downwards at 45°±1°, and the right air duct 32 is inclined downwards at 50°±1°, forming an 88° intersection angle between the two air duct axes. A flow distribution ratio of 1:1.11 is achieved by adjusting the cross-sectional areas of the left air duct 31 and the right air duct 32.

[0040] Optionally, the inner wall of the L-shaped integrated air duct structure is provided with guide ribs, which are evenly distributed along the turning point of the L-shaped integrated air duct structure to reduce airflow turbulence.

[0041] The drive device includes a brushless motor, which is linked to the flow rate of nozzle 4, left air duct 31 and right air duct 32 through a speed control module.

[0042] The blade installation angle of the fan blade assembly 5 varies non-linearly along the radial direction. The tilt angle of the arc-shaped blades of the fan blade assembly 5 is consistent with the airflow direction to enhance the spiral airflow effect. The fan blade assembly 5 includes 9 7075 aluminum alloy arc-shaped blades, with the blade root installation angle gradually changing from 28° to 15° at the blade tip angle. The surface is laser-engraved with a sharkskin texture, with a protrusion height of 50μm and a spacing of 200μm. A matching brushless motor is connected to a Hall flow sensor via a PID controller. When the flow rate in the left air duct 31 reaches 35m³, the motor... 3 When the speed reaches 2800 rpm, the motor speed is automatically increased to 2800 rpm and the opening of the right air duct is increased by 32 degrees simultaneously.

[0043] The air inlet 2 of the housing 1 is equipped with a noise-reducing filter with a pore density of 20-40 PPI to reduce airflow noise. A three-layer composite noise-reducing filter is installed at the air inlet 2, comprising: an outer 20 PPI stainless steel coarse filter, a middle 30 PPI polyurethane porous sound-absorbing layer with a thickness of 8 mm, and an inner 40 PPI nylon fine filter, thereby reducing airflow noise by 6-8 dB(A) while maintaining an air intake efficiency of ≥95%.

[0044] The curved blade surface of the fan blade assembly 5 is provided with a nanoscale biomimetic shark skin texture structure. This texture structure mimics the microscopic unevenness of shark skin, with a depth of 10-50 μm and a spacing of 50-100 μm. The biomimetic texture reduces boundary layer separation on the blade surface, lowers airflow resistance, and enhances airflow adhesion, thereby improving fan efficiency.

[0045] Description: Upon startup, the airflow enters the L-shaped duct through the noise reduction filter, completes a 90° turn and accelerates under the guidance of the guide ribs. The fan blade assembly 5 divides the airflow into multiple spiral streams, which form a cross air curtain through the guides at different tilt angles of the left and right air ducts 31 and 32. By adjusting the motor speed, which is adjustable within the range of 2000-3500 rpm, the output air curtain coverage angle can be continuously varied within the range of 60°-120° to meet the needs of different scenarios.

[0046] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A spiral-type blower, comprising a housing (1), an air inlet (2), an air outlet, and a drive device, characterized in that: The housing (1) is provided with an L-shaped integrated air duct structure. The L-shaped integrated air duct structure has a 90-degree turn from the air inlet (2) to the air outlet, and the air inlet (2) and the air outlet are spatially staggered. The air outlet includes a nozzle (4), a left air duct (31) and a right air duct (32). The air outlet axis of the left air duct (31) is inclined downward at 45°, and the air outlet axis of the right air duct (32) is inclined downward at 50°, forming an arc-shaped cross air curtain. The fan blade assembly (5) includes no fewer than nine curved blades.

2. The blower with spiral air outlet according to claim 1, characterized in that, The nozzle (4) is set at an angle, and its axis forms an angle of 10°-30° with the direction after the duct turns, so as to guide the airflow to spiral out.

3. The blower with spiral air outlet according to claim 1, characterized in that, The flow distribution ratio of the left air duct (31) to the right air duct (32) is 1:1.05-1.15, and the intersection angle of the axes of the two air ducts is 85°-95°.

4. A spiral-discharge blower according to claim 1, characterized in that, The blade mounting angle of the fan blade assembly (5) varies non-linearly along the radial direction.

5. A spiral-discharge blower according to claim 1, characterized in that, The inner wall of the L-shaped integrated air duct structure is provided with guide ribs, which are evenly distributed along the turning point of the L-shaped integrated air duct structure to reduce airflow turbulence.

6. A blower with spiral air outlet according to claim 1, characterized in that, The drive device includes a brushless motor, which is linked to the flow rate of the nozzle (4), the left air duct (31) and the right air duct (32) through a speed control module.

7. A spiral-discharge blower according to claim 1, characterized in that, The angle of inclination of the arc-shaped blades of the fan blade assembly (5) is consistent with the airflow direction, which is used to enhance the spiral air outlet effect.

8. A blower with spiral air outlet according to claim 1, characterized in that, The housing (1) is provided with a noise reduction filter at the air inlet (2), and the pore density of the noise reduction filter is 20-40 PPI, which is used to reduce airflow noise.

9. A spiral-discharge blower according to claim 1, characterized in that, The inner diameter of the L-shaped integrated air duct structure gradually decreases at the turning point, with a contraction ratio of 1:0.8 to 1:0.6, in order to improve the airflow acceleration efficiency.

10. A spiral-discharge blower according to claim 1, characterized in that, The surface of the arc-shaped blades of the fan blade assembly (5) is provided with a nanoscale biomimetic sharkskin texture structure.

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