Double-air-outlet structure and bladeless fan

Abstract

The utility model relates to the technical field of bladeless fans, in particular to a double-air-outlet structure and a bladeless fan, the double-air-outlet structure comprises an air outlet frame, an air inlet formed in the bottom of the air outlet frame, a first air outlet formed in the inner side of the air outlet frame and a second air outlet formed in the front portion of the air outlet frame, the first air outlet is a long and thin strip-shaped gap, the second air outlets are a plurality of long-strip-shaped openings, the width of the first air outlet is smaller than that of the second air outlets, and the depth of the first air outlet is larger than that of the second air outlets. A double-air-outlet structure is adopted, air flow is directly blown through the second air outlet in the front portion to provide penetrating power, jet flow of the first air outlet in the rear portion assists in guiding to form a larger air field, high-energy-efficiency air supply is achieved, the comfort degree is improved, and the air supply coverage range is enlarged.

Description

Technical Field

[0001] This utility model relates to the field of bladeless fan technology, specifically to a dual-outlet structure and a bladeless fan. Background Technology

[0002] A bladeless fan typically consists of a housing and an exhaust frame. The housing and exhaust frame are connected by a snap-fit ​​mechanism, and the fan and motor are located inside. Air enters through the air inlet of the housing, and the fan outputs a high-speed airflow to create an airflow that travels through the cavity of the exhaust frame and is then blown out through the outlet.

[0003] In existing technologies, some bladeless fans use a slit-style air outlet at the rear of the air outlet frame. This relies on the high-speed jetting of a small amount of air through the annular slit to trigger the Coanda effect, guiding a large volume of external air to form an airflow. While this method amplifies airflow, it suffers from significant airflow attenuation, short delivery distance, and insufficient penetration, making it unsuitable for long-distance ventilation. Other bladeless fans use a front-discharge method, with several air outlets directly located at the front of the annular air outlet frame. Air is fed into the hollow air outlet frame from the fan system and then ejected directly through the holes. This provides a longer delivery distance but cannot guide entrained air, resulting in weak air diffusion and a harsher wind feel.

[0004] Therefore, it is necessary to provide a dual-outlet structure and a bladeless fan. Utility Model Content

[0005] Based on the aforementioned problems in the existing technology, the purpose of this utility model embodiment is to provide a bladeless fan with a dual-outlet structure. The dual-outlet structure provides penetrating power by directly blowing air through the second air outlet at the front, while the jet flow from the first air outlet at the rear assists in guiding the formation of a larger air field, thereby achieving high-efficiency air delivery, improving comfort, and expanding the air delivery coverage.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: This utility model discloses a dual-outlet structure, including an air outlet frame, an air inlet at the bottom of the air outlet frame, a first air outlet disposed on the inner side of the air outlet frame, and a second air outlet disposed at the front of the air outlet frame. The first air outlet is a long and narrow slit, and the second air outlet is a plurality of long and narrow openings. ， The width of the first air outlet is smaller than the width of the second air outlet. ， The depth of the first air outlet is greater than the depth of the second air outlet.

[0007] Furthermore, the air volume output from the first air outlet accounts for 20% to 30% of the total air volume output from the air inlet.

[0008] Furthermore, the air volume output from the second air outlet accounts for 70% to 80% of the total air volume output from the air inlet.

[0009] Furthermore, the first air outlet is distributed circumferentially along the inner sidewall of the air outlet frame and fits against the curved surface of the inner sidewall of the air outlet frame.

[0010] Furthermore, a tapering arc-shaped guide section is provided at the slit of the first air outlet, and the guide section is involute in shape.

[0011] Furthermore, the width of the first air outlet is 1-5mm, so that the speed of the jet airflow output through the first air outlet meets the standard and thus stimulates the Coanda effect.

[0012] Furthermore, multiple elongated openings of the second air outlet are evenly distributed on the front surface of the air outlet frame, with the opening direction perpendicular to the air supply direction.

[0013] Furthermore, the width of the second air outlet is 3 to 10 mm.

[0014] To achieve the above objectives, the technical solution adopted by this utility model is to provide a bladeless fan, including the dual air outlet structure provided by any of the above solutions.

[0015] The beneficial effects of this utility model are as follows: The dual-outlet structure of this utility model includes an air outlet frame, an air inlet at the bottom of the air outlet frame, a first air outlet located inside the air outlet frame, and a second air outlet located at the front of the air outlet frame. The first air outlet is a long and narrow slit, and the second air outlet is multiple long and narrow openings. ， The width of the first air outlet is smaller than the width of the second air outlet. ， The depth of the first air outlet is greater than the depth of the second air outlet. This utility model adopts a dual-outlet structure, which provides penetrating power through the direct airflow from the second air outlet at the front, and the jet flow from the first air outlet at the rear assists in guiding and forming a larger air field, achieving high-efficiency air delivery, improving comfort, and expanding the air delivery coverage area. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the bladeless fan of this utility model;

[0018] Figure 2 This is an exploded view of the bladeless fan of this utility model;

[0019] Figure 3 This is a cross-sectional view of the bladeless fan of this utility model;

[0020] Figure 4 This is a cross-sectional view of the dual-outlet air structure of this utility model.

[0021] The component names and their numbers in the diagram are as follows:

[0022] Bladeless fan 100;

[0023] Base 1, air inlet 11;

[0024] Body housing 2, connection opening 21;

[0025] Fan assembly 3, fan 31, fan motor 32;

[0026] The dual-air outlet structure 4 includes an air outlet frame 41, an air inlet 42, a first air outlet 43, a guide section 431, and a second air outlet 44. Detailed Implementation

[0027] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] It should be noted that when a component is referred to as "connected to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0029] 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 or an electrical connection; they can refer to 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.

[0030] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0031] Throughout this specification, reference to "an embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, a particular feature, structure, or characteristic may be combined in any suitable manner.

[0032] like Figure 1-3 As shown, this embodiment provides a bladeless fan 100, including a base 1, a housing 2 disposed on the base 1, a fan assembly 3 disposed inside the housing 2, and a dual-outlet structure 4 disposed above the housing 2.

[0033] In some embodiments, the base 1 is generally shaped like an upward-opening dome, with multiple air inlets 11 formed on its side wall. These air inlets 11 are elongated and regularly arranged on the side wall of the base 1. The air inlets 11 are used to guide external air into the base 1 and the housing 1, thereby providing an air source for the airflow generation of the bladeless fan 100. The circular structure of the base 1 ensures the stability of the bottom, evenly distributes the weight, and prevents the bladeless fan 100 from tipping over.

[0034] In some other embodiments, the base 1 is provided with a oscillation drive device (not shown in the figure), which is suitable for driving the body housing and the dual air outlet structure 4 to rotate.

[0035] In some embodiments, the bottom of the housing 2 is connected to the base 1, and a connection opening 21 is provided on the top of the housing 2. The connection opening 21 is used to connect the fan assembly 3 and the dual-outlet structure 4, so that the airflow of the fan assembly 3 is input into the dual-outlet structure 4. A cavity is formed inside the housing 2 and the base 1 for installing the fan assembly 3.

[0036] In some embodiments, the fan assembly 3 includes a fan 31 and a fan motor 32. The fan 31 consists of multiple blades arranged radially around a central axis, which efficiently propel airflow when rotating. The fan 31 is driven by the fan motor 32, and the rotating shaft of the fan motor 32 drives the fan 31 to rotate. When the fan motor 32 starts, it provides power to the fan 31, causing the fan 31 to rotate at high speed. At this time, external air enters the cavity formed by the housing 2 and the base 1 through the air inlet 11 on the base 1. The air is drawn in and accelerated by centrifugal force, so that the air obtains a large flow velocity to form an airflow, which is then delivered to the dual air outlet structure 4 through the connection opening 21 on the housing 2.

[0037] In some of these embodiments, such as Figure 4As shown, the dual-outlet structure 4 is located above the housing 2. The dual-outlet structure 4 includes an outlet frame 41, an air inlet 42 at the bottom of the outlet frame 41, a first air outlet 43 located inside the outlet frame 41, and a second air outlet 44 located at the front of the outlet frame 41. The outlet frame 41 is roughly a hollow annular structure, forming a smooth annular air duct wall. The shape of the air inlet 42 matches the shape of the fan 31's outlet. The air inlet 42 at the bottom of the outlet frame 41 is fixedly connected to the outlet of the fan 31, so that the airflow formed after being accelerated by the fan 31 is input into the annular outlet frame 41 through the air inlet 42.

[0038] In some other embodiments, the air outlet frame 41 is generally U-shaped, forming the left and right side air duct walls.

[0039] In some embodiments, the first air outlet 43 is located on the inner rear side of the air outlet frame 41, i.e., on the inner side of the duct wall. The first air outlet 43 is a narrow, elongated slit. A tapered arc-shaped guide portion 431 with an involute shape is provided at the slit of the first air outlet 43 to reduce turbulence. The first air outlet 43 is distributed circumferentially along the inner sidewall of the air outlet frame 41 and fits against the curved surface of the inner sidewall of the air outlet frame 41 to guide the airflow to flow tightly against the duct wall of the air outlet frame 41. The width of the first air outlet 43 is 1 to 5 mm, preferably 2 mm. The length of the first air outlet 43 is determined by calculation or simulation experiments, thereby ensuring that the velocity of the jet airflow output through the first air outlet 41 meets the standard and thus stimulates the Coanda effect.

[0040] Furthermore, the first air outlet 43 stimulates the Coanda effect by outputting a high-speed jet of air (≥10~16m / s), disrupting the boundary layer on the inner wall of the air outlet frame 41, guiding the airflow along the curved surface of the inner wall, entraining surrounding air, expanding the wind field coverage, and softening the wind feel. Moreover, the airflow output from the first air outlet 43 only accounts for 20%~30% of the total airflow output from the air inlet 42, resulting in low energy consumption; it is mainly used for airflow guidance rather than providing the main airflow.

[0041] In some other embodiments, when the air outlet frame 41 is generally U-shaped, the first air outlet 43 is symmetrically distributed on the left and right sides along the inner sidewall of the air outlet frame 41 and fits against the inner sidewall of the air outlet frame 41 to guide the airflow to flow closely against the duct wall.

[0042] In some embodiments, the second air outlet 44 is located at the front of the air outlet frame 41, that is, on the side facing the air delivery direction. The second air outlet 44 consists of multiple elongated openings, and its width is 3-10 mm, preferably 6-8 mm. The width of the second air outlet 44 is greater than that of the first air outlet 43, and the depth of the first air outlet 43 is greater than that of the second air outlet 44. Therefore, the path of the second air outlet 44 is shorter than that of the first air outlet 43, resulting in less flow resistance and facilitating the direct ejection of high-speed airflow. The multiple elongated openings of the second air outlet 44 are evenly distributed on the front surface of the air outlet frame 41, with the opening direction perpendicular to the air delivery direction, forming a direct airflow.

[0043] Furthermore, the second air outlet 44 serves as the main air supply channel, and its output air volume accounts for 70% to 80% of the total output air volume of the air inlet 42. It directly ejects high-speed airflow, which can improve the air supply distance and penetration, meeting the needs of long-distance ventilation. By using the second air outlet 44 as the main air supply channel, the air volume attenuation problem of traditional slit solutions can be avoided, and the wind speed stability is ensured through direct airflow.

[0044] In some embodiments, the target and principle for airflow distribution between the first air outlet 43 and the second air outlet 44 is that the jet slit velocity output from the first air outlet 43 reaches the threshold for boundary layer disruption, i.e., 10-16 m / s. The airflow output from the first air outlet 43 accounts for 20%-30% of the total airflow, with the remaining airflow mainly output through the second air outlet 44. Natural flow distribution is achieved by controlling the flow resistance within the air outlet frame 41 and the lengths and cross-sectional areas of the first and second air outlets 43 and 44. The first air outlet 43 is a long, narrow slit, while the second air outlet 44 consists of multiple long, narrow openings. Compared to the first air outlet 43, the second air outlet 44 has a larger opening area, a shorter path, and lower flow resistance.

[0045] Furthermore, CFD simulation or wind tunnel testing was used to quantitatively calculate the first air outlet 43 and the second air outlet 44 to obtain the actual air volume distribution ratio and verify whether it meets the design target. The experimental results are as follows.

[0046] Table 1.

[0047]

[0048] In some embodiments, the parameters of the first air outlet 43 are calculated, and the width of the first air outlet 43 is set to 1-5 mm; preferably, the width of the first air outlet 43 is 2 mm to reduce energy consumption. The wind speed and pressure of the air inlet 42 at the bottom of the air outlet frame 41 are set, wherein the wind speed v in and pressure p inThe performance of fan 31 determines the output jet velocity v of the first air outlet 43. Using the length L of the first air outlet 43 as a variable, the output jet velocity v of the first air outlet 43 is obtained through CFD simulation / experiment. L When v L When the speed is ≥16m / s, the corresponding length L of the first air outlet 43 is the critical value L of the required length of the first air outlet 43. critical To avoid the length L>>L of the first air outlet 43 critical This leads to energy waste.

[0049] In some embodiments, parameters of the second air outlet 44 are calculated to maximize the airflow per unit time while ensuring a certain air velocity (e.g., 6 m / s) at the second air outlet 44. The air velocity v at the air inlet 42 at the bottom of the air outlet frame 41 is set. in Pressure p in And the target air velocity at the second air outlet 44 (e.g., wind speed of 1 m / s at a distance of 3 meters from the second air outlet). Using the width D of the second air outlet 44 as a variable, test 3 from large to small, and record the wind speed and air volume for each width D value; select the width D value of the second air outlet 44 that satisfies the wind speed condition and has the largest air volume. max As a preferred value.

[0050] Furthermore, the width of the second air outlet 44 is 3 to 10 mm, preferably 6 to 8 mm.

[0051] In some embodiments, when the bladeless fan 100 is in high or medium speed mode, the width of the first air outlet 43 is set to 2mm and the width of the second air outlet 44 is set to 6-8mm, thereby ensuring that the jet wind speed v output by the first air outlet 43 is [missing information]. L ≥16m / s, triggering the Coanda effect, achieving airflow along the wall and entrainment. When the bladeless fan 100's wind speed mode is at a low setting, due to the smaller overall air volume, the jet wind speed output from the first air outlet 43 is allowed to be <16m / s, and no more energy is consumed to maintain the wall-mounted flow. In this embodiment, the dual air inlet structure 4 of the bladeless fan 100 utilizes a static structure for natural adaptation, eliminating the need for a dynamic damper structure and reducing production costs.

[0052] The bladeless fan 100 of this utility model includes a base 1, a body shell 2 disposed on the base 1, a fan assembly 3 disposed inside the body shell 2, and a dual air outlet structure 4 disposed above the body shell 2. The dual air outlet structure 4 includes an air outlet frame 41, an air inlet 42 opened at the bottom of the air outlet frame 41, a first air outlet 43 disposed inside the air outlet frame 41, and a second air outlet 44 disposed at the front of the air outlet frame 41. The first air outlet 43 is a long and narrow strip-shaped slit, and the first air outlet 43 stimulates the Coanda effect by outputting high-speed jet airflow. The second air outlet 44 has multiple long strip-shaped openings to facilitate the direct ejection of high-speed airflow. This invention achieves high-efficiency air delivery by using most of the airflow for direct front blowing, increasing wind speed and distance, and using a small portion of the airflow for the rear slit to stimulate a suction effect. Airflow distribution is achieved through a static dual-outlet structure 4, eliminating the need for dynamic structures such as dampers and valves, thus reducing structural complexity. It also reduces the jet airflow flow, lowering motor load and noise. The direct front airflow provides penetration, while the rear jet assists in guiding the formation of a larger air field, improving comfort and expanding the air delivery coverage.

[0053] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A dual-outlet structure, characterized in that, The system includes an air outlet frame, an air inlet at the bottom of the air outlet frame, a first air outlet located inside the air outlet frame, and a second air outlet located at the front of the air outlet frame. The first air outlet is a long, narrow slit, and the second air outlet consists of multiple long, narrow openings. ， The width of the first air outlet is smaller than the width of the second air outlet. ， The depth of the first air outlet is greater than the depth of the second air outlet.

2. The dual-outlet structure according to claim 1, characterized in that, The air volume output from the first air outlet accounts for 20% to 30% of the total air volume output from the air inlet.

3. The dual-outlet structure according to claim 1, characterized in that, The air volume output from the second air outlet accounts for 70% to 80% of the total air volume output from the air inlet.

4. The dual-outlet structure according to claim 1, characterized in that, The first air outlet is distributed circumferentially along the inner sidewall of the air outlet frame and fits against the curved surface of the inner sidewall of the air outlet frame.

5. The dual-outlet structure according to claim 1, characterized in that, A tapering arc-shaped airflow guide is provided at the slit of the first air outlet, and the airflow guide is involute in shape.

6. The dual-outlet structure according to claim 2, characterized in that, The width of the first air outlet is 1 to 5 mm, so that the speed of the jet airflow output through the first air outlet meets the standard and thus stimulates the Coanda effect.

7. The dual-outlet structure according to claim 1, characterized in that, Multiple elongated openings of the second air outlet are evenly distributed on the front surface of the air outlet frame, with the opening direction perpendicular to the air supply direction.

8. The dual-outlet structure according to claim 1, characterized in that, The width of the second air outlet is 3-10mm.

9. A bladeless fan, comprising the dual-outlet structure as described in any one of claims 1 to 8.

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