Air supply components and bladeless fans

Abstract

The present invention discloses an air supply component and a bladeless fan, wherein the air supply component includes a volute, and a rear air duct arranged along a tangent direction is provided on the side of the volute; the end of the rear air duct is connected to the volute, and an air guide wall and a front air duct are respectively provided on both sides of the end of the rear air duct; the front air duct is located at the end of the rear air duct away from the volute and has an air outlet; the air guide wall is located at the end of the rear air duct close to the volute to guide the air sucked by the volute to the air outlet. In the air supply component of the present invention, the distance between the air outlet and the air guide wall is increased, and the cavity noise is reduced; the high-speed airflow enters the rear air duct and hits the air guide wall, and the airflow squeezed by the narrow air duct flows out evenly from the air outlet.

Description

Technical Field

[0001] The invention belongs to the field of air supply, and in particular relates to an air supply component and a bladeless fan. Background Art

[0002] Bladeless fans are also called air multipliers. They can produce natural and continuous cool breeze by forcing air to be discharged through the exhaust port of the air duct, thereby increasing the air flow. They are popular among consumers for their safety, cleanliness and beauty.

[0003] The existing bladeless fan includes a base, which is connected to an air duct. A rotatable wind wheel is arranged in the base. When the wind wheel rotates, air enters from an air inlet on the side of the base and is discharged from an air outlet of the air duct, thereby achieving a "bladeless" air outlet effect.

[0004] However, the high noise and low air volume have always been criticized by users, which seriously affects the user experience. This is because the outlet of the existing bladeless fan is placed on the same side as the air outlet, and the high-speed rotating gas directly impacts the outlet grille and swirls in the air duct, generating vortices, which block the airflow in the air duct and generate cavity noise. At the same time, there is an upward velocity component in the airflow of the air outlet of this existing structure, and the upstream airflow speed will be higher and the direction will be deflected upward. The air outlet is deflected, and a reasonable guide structure needs to be arranged in the air duct to achieve uniform air outlet, resulting in a large pressure loss in the air duct, and the air duct has many parts and complex structure. Summary of the invention

[0005] The present invention provides an air supply component and a bladeless fan to solve the technical problem of air outlet noise mentioned in the background technology.

[0006] To achieve the above objectives, the specific technical solutions of the air supply assembly and the bladeless fan of the present invention are as follows:

[0007] An air supply component includes a volute, and a rear air duct arranged along a tangential direction is provided on the side of the volute; the end of the rear air duct is connected to the volute, and an air guide wall and a front air duct are respectively provided on both sides of the end of the rear air duct; the front air duct is located at the side of the end of the rear air duct away from the volute and forms an air outlet; the air guide wall is located at the end of the rear air duct close to the volute to guide the air sucked by the volute to the air outlet.

[0008] Furthermore, a buffer air duct extending in a tangential direction of the volute is formed between the volute and the rear air duct, and the rear air duct is connected to the volute through the buffer air duct.

[0009] Furthermore, the buffer air duct is formed with an inclined extension portion, and the front air duct is connected to the volute through the extension portion.

[0010] Furthermore, two air ducts are provided and are arranged oppositely on the volute; the buffer air duct is provided with a diverter plate, and the diverter plate allows the air in the buffer air duct to evenly enter the two air ducts.

[0011] Furthermore, a rotatable wind wheel is arranged in the volute.

[0012] Furthermore, the diameter D of the wind wheel and the horizontal distance L between the center of the impeller and the adjacent air outlet satisfy 1.3D≦L≦1.6D.

[0013] Furthermore, the diameter D of the wind wheel and the height difference H between the center of the impeller and the adjacent air outlet satisfy 1.5D≦H≦1.8D.

[0014] Furthermore, an air outlet grille is formed on the side of the front air duct away from the rear air duct along the extension direction, and the air outlet is arranged on the air outlet grille.

[0015] Furthermore, the air outlet is arranged along the vertical direction of the air guide wall.

[0016] A bladeless fan comprises the above-mentioned air supply component.

[0017] The air supply assembly and bladeless fan of the present invention have the following advantages: the distance between the air outlet and the air guide wall is increased, thereby reducing cavity noise; the high-speed airflow enters the rear air duct and hits the air guide wall, and the airflow squeezed through the narrow air duct flows out evenly from the air outlet; the structure inside the air duct is simplified, thereby reducing the pressure loss from the upstream to the downstream of the air flow in the air duct, reducing the number of parts, being easier to assemble, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the bladeless fan of the present invention;

[0019] Figure 2 A half-section schematic diagram of a bladeless fan of the present invention;

[0020] Figure 3 A sectional view of a bladeless fan of the present invention;

[0021] Figure 4 This is the spectrum diagram of a traditional bladeless fan;

[0022] Figure 5 It is the spectrum diagram of the bladeless fan of the present invention.

[0023] Description of the markings in the figure:

[0024] 1. Volute; 11. Air inlet; 12. Wind wheel; 2. Buffer air duct; 21. Extension; 22. Diverter plate; 3. Rear air duct; 31. Air guide wall; 32. Air guide curved surface; 4. Front air duct; 41. Air outlet grille; 42. Air outlet. DETAILED DESCRIPTION

[0025] In order to better understand the purpose, structure and function of the present invention, an air supply component and a bladeless fan of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0026] like Figures 1 to 3 As shown, the air supply assembly of the present invention, driven by the centrifugal fan, takes in air from the air inlet 11 along the air duct and discharges air from the air outlet 42.

[0027] Specifically, the air supply assembly includes a volute 1. The volute 1 is generally cylindrical in surface shape, and air inlets 11 are formed at both ends of the volute 1. A wind wheel 12 as a driver is arranged in the volute 1, and the wind wheel 12 is a centrifugal wind wheel 12, so that the wind wheel 12 rotates, sucks air from the air inlet 11, and discharges it to the outside. Generally, the wind wheel 12 is a centrifugal wind wheel 12, and by doing work on the fluid, the velocity energy and pressure potential energy of the fluid are increased, forming a high-speed airflow, and providing sufficient air volume and wind pressure.

[0028] An outlet arranged along the tangential direction is provided on the side of the volute 1, and the outlet is connected to a buffer air duct 2, and two air ducts are connected to the ends of the buffer air duct 2, so that the air duct length of the entire air supply assembly is extended through the buffer air duct 2.

[0029] The end of the buffer duct 2 extends along the tangential direction of the volute 1 to form an air duct. The air duct includes two parts: the rear duct 3 and the front duct 4. Among them, the rear duct 3 is also arranged along the tangential direction of the volute 1, and the end of the rear duct 3 is connected to the outlet of the volute 1 through the buffer duct 2, and the two sides of the end of the rear duct 3 are respectively provided with an air guide wall 31 and a front duct 4. The front duct 4 is located at the end of the rear duct 3 away from the volute 1 and is formed with an air outlet 42. The air guide wall 31 is located at the end of the rear duct 3 close to the volute 1 to guide the air sucked by the volute 1 to the air outlet 42.

[0030] Specifically, the front air duct 4 forms an air outlet grille 41 arranged along the extension direction on the side away from the rear air duct 3, and the air outlet 42 is arranged between the air outlet grilles 41. The air outlet 42 is arranged in the vertical direction of the air guide wall 31. Therefore, the air guidance of the air outlet grille 41 is smoother while ensuring the air outlet pressure and wind speed, which reduces the air outlet deviation phenomenon and achieves the effect of uniform air supply.

[0031] The buffer air duct 2 is formed with an inclined extension portion 21 , and the extension portion 21 is connected to the front air duct 4 to ensure the air volume of the front air duct 4 .

[0032] The diameter D of the wind wheel 12 and the horizontal distance L between the center of the impeller and the adjacent air outlet 42 satisfy 1.3D≦L≦1.6D; the diameter D of the wind wheel 12 and the height difference H between the center of the impeller and the adjacent air outlet 42 satisfy 1.5D≦H≦1.8D. This ensures the length of the buffer air duct 2, extending the airflow in the air duct, and ensuring that the airflow accelerated by the wind wheel 12 can impact the air guide wall 31, avoiding the airflow from directly impacting the air outlet grille 41, thereby reducing cavity noise and improving user experience.

[0033] Moreover, an air guiding curved surface 32 is formed at one end of the rear air duct 3 away from the volute 1 , and the air guiding curved surface 32 extends along an arc from the end of the air guiding wall 31 to the end of the front air duct 4 .

[0034] Generally, two air ducts are arranged opposite to each other, so the two air ducts are arranged opposite to each other and connected in parallel to the buffer air duct 2. Correspondingly, the buffer air duct 2 is provided with a diverter plate 22, which is in an inverted cone shape and symmetrically arranged between the two air ducts, so as to divert the high-speed airflow by 22, and evenly divert the wind into the two air ducts, which is conducive to improving the consistency of the air outlet effect of the two air ducts, and at the same time can reduce the noise generated by the wind in the air duct, thereby reducing the working noise of the bladeless fan.

[0035] In addition, the buffer air duct 2 may not be provided, and the rear air duct 3 and the front air duct 4 may be directly installed on the volute 1, which can also achieve a certain noise reduction effect.

[0036] The present invention also discloses a bladeless fan, comprising the above-mentioned air supply assembly. In addition to being applied to bladeless air ducts, the air supply assembly can also be used on other devices that drive fluid flow.

[0037] The noise effect of this application, such as Figure 4 As shown in the figure, it can be seen that when the speed is 1500rpm, the traditional bladeless fan has an obvious peak near the frequency of 1000Hz, and the maximum noise value is 26.11dB. Figure 5 As shown, the peak value of the bladeless fan of the patent at a frequency of 1000Hz is lower than that of the traditional bladeless fan, and the maximum noise value is 21.9dB. The bladeless fan of the present application has a significant noise reduction effect.

[0038] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. An air supply assembly, comprising a volute, characterized in that: A rear air duct is arranged along the tangent direction on the side of the volute; the end of the rear air duct is connected to the volute, and an air guide wall and a front air duct are respectively arranged on both sides of the end of the rear air duct; the front air duct is located at the end of the rear air duct on the side away from the volute and forms an air outlet; the air guide wall is located at the end of the rear air duct on the side close to the volute to guide the air sucked by the volute to the air outlet; A buffer air duct extending in the tangential direction of the volute is formed between the volute and the rear air duct, and the rear air duct is connected to the volute through the buffer air duct; The diameter D of the wind wheel and the horizontal distance L between the center of the impeller and the adjacent air outlet shall satisfy 1.3D≦L≦1.6D; The wind wheel diameter D, and the height difference H between the impeller center and the adjacent air outlet satisfy 1.5D≦H≦1.8D.

2. The air supply assembly according to claim 1, characterized in that: The buffer air duct is formed with an inclined extension portion, and the front air duct is communicated with the volute through the extension portion.

3. The air supply assembly according to claim 1, characterized in that: Two air ducts are provided and are arranged oppositely on the volute; the buffer air duct is provided with a diverter plate, and the diverter plate allows the air of the buffer air duct to enter the two air ducts evenly.

4. The air supply assembly according to claim 1, characterized in that: A rotatable wind wheel is arranged in the volute.

5. The air supply assembly according to claim 1, characterized in that: The front air duct forms an air outlet grille arranged along the extension direction at a side away from the rear air duct, and the air outlet is arranged on the air outlet grille.

6. The air supply assembly according to claim 5, characterized in that: The air outlet is arranged along the vertical direction of the air guide wall.

7. A bladeless fan, characterized in that: It comprises an air supply assembly as described in any one of claims 1-6.

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