A bladeless fan and a bladeless fan nozzle

Abstract

The application discloses a bladeless fan and a nozzle of the bladeless fan. The shell is internally hollow and is formed by rotating and molding a shell section formed by a horizontal guide surface, a circular-arc surface, an expansion surface, a smooth surface and a diffusion surface. An air outlet is arranged at the end of the circular-arc surface, and gas is shot out from the air outlet at high speed. The gas is driven by the Coanda effect through the Coanda surface, and the airflow at the inner side is increased. Since the convex side of the circular-arc surface is a windward surface and is circular-arc-shaped, the windward surface is consistent with the airflow track and can guide the airflow and reduce the turbulent energy loss. Meanwhile, part of the airflow flows from the windward surface to a leeward surface, low pressure is formed at the leeward surface, and the airflow is converged. Part of the airflow continues to flow outwards along the windward surface of the flow guide device and flows along the circular-arc surface to the air outlet path. Vortex is formed at the leeward surface, low pressure is formed, surrounding airflow is sucked, and the airflow is increased.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of bladeless fan structure, and particularly relates to a bladeless fan and a bladeless fan nozzle. BACKGROUND

[0002] The bladeless fan is also called air doubling machine, which is developed from the air hand dryer. The principle is to force the internal air to pass through the cavity and be shot out from the slit, so that a higher speed can be obtained, and the external airflow is subjected to the Coanda effect, so that the airflow is enhanced by about 15 times.

[0003] The existing bladeless fan nozzle cross-section structure is smooth without protruding structure at the split of the circular arc and the guide surface. When the nozzle structure works, the external airflow directly transitions from the surface, and the airflow is split at the circular arc and the guide surface. Part of the airflow passes through the circular arc surface to the vicinity of the slit and is subjected to the Coanda effect, and the other part of the airflow is directly shot forward by the guide surface. The two airflows form small vortexes at the split, causing the total flow to decrease, so that the bladeless fan reaches the best working state. SUMMARY

[0004] The purpose of the present application is to provide a bladeless fan and a bladeless fan nozzle to overcome the shortcomings of the prior art.

[0005] A bladeless fan nozzle comprises a shell, the shell is in a circular ring structure, the shell is obtained by rotating the shell cross-section as a rotating body around the rotating center, the shell cross-section comprises a horizontal guide surface, one end of the horizontal guide surface is provided with a circular arc surface tangent to the horizontal guide surface, the other end of the horizontal guide surface is sequentially connected with an expansion surface, a smooth surface and a diffusion surface, the end of the diffusion surface is provided with a Coanda surface, the end of the Coanda surface is spaced apart from the end of the circular arc surface to form an exhaust port, and the exhaust direction of the exhaust port is towards the side of the concave surface of the circular arc surface.

[0006] Preferably, a bladeless fan nozzle inlet is formed on one side of the horizontal guide surface of the shell.

[0007] Preferably, a ring of flow guiding devices is arranged on the outer ring of the shell.

[0008] Preferably, the cross-section of the flow guiding device along the circular ring axis of the shell is a flow guiding cross-section, the flow guiding cross-section comprises a windward surface and a leeward surface, the windward surface and the leeward surface are circular arc surfaces with different radii of curvature, one end of the circular arc of the windward surface is tangent to one end of the circular arc surface, one end of the circular arc of the leeward surface is tangent to the bottom of the horizontal guide surface, the other end of the circular arc of the windward surface is connected to the other end of the circular arc of the leeward surface through a connecting circular arc segment, one end of the circular arc of the connecting circular arc segment is tangent to the other end of the circular arc of the windward surface, and the other end of the circular arc of the connecting circular arc segment is tangent to the other end of the circular arc of the leeward surface.

[0009] Preferably, the circular arc surface is a semicircular structure, the characteristic radius of the circular arc surface is R1, the radius of the circular arc of the windward surface is R2, and R2 is 0.4-0.6R1, and the radius of the circular arc of the leeward surface is R3, and R3 is 1.5-2.5R1.

[0010] Preferably, the angle θ corresponding to the arc length of the windward surface is 95-130°, and the angle β corresponding to the arc length of the leeward surface is 40-50°.

[0011] Preferably, the circle corresponding to the windward surface and the circle corresponding to the leeward surface are externally tangent.

[0012] Preferably, the radius of the connecting circular arc segment is less than 0.2 times the radius of the windward surface.

[0013] A bladeless fan nozzle includes the bladeless fan nozzle.

[0014] Preferably, the bladeless fan nozzle is connected to a bladeless fan power seat, the bladeless fan power seat is a hollow structure, a power source is arranged in the bladeless fan power seat, and one end of the bladeless fan power seat is in communication with the inner cavity of the shell.

[0015] Compared with the prior art, the present application has the following beneficial technical effects:

[0016] The present application provides a bladeless fan nozzle, which is formed by rotating a shell cross section formed by a horizontal guide surface, a circular arc surface, an expansion surface, a smooth surface and a diffusion surface, and has an internal cavity structure. An air outlet is arranged at the end of the circular arc surface, and gas is ejected at high speed from the air outlet. Due to the Coanda effect, the airflow on the inside is driven, thereby increasing the airflow. Since the convex side of the circular arc surface is the windward surface and has a circular arc shape, it conforms to the airflow trajectory and can guide the airflow, thereby reducing the turbulent energy loss. Meanwhile, part of the airflow flows from the windward surface to the leeward surface, and forms a low pressure on the leeward surface, thereby achieving the effect of suction and gathering the airflow, thereby increasing the airflow.

[0017] Preferably, a guide device is arranged on the outer ring of the shell. Part of the airflow flows to the inside along the circular arc surface and is subjected to the Coanda effect together with the airflow on the inside. Part of the airflow continues to flow to the outside along the windward surface of the guide device, flows along the circular angle to the air outlet, forms a vortex on the leeward surface, forms a low pressure, and drives the surrounding airflow to flow, thereby increasing the airflow. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a cross-sectional view of a bladeless fan nozzle according to an embodiment of the present application.

[0019] Figure 2 FIG. 4 is a schematic view of the arrangement of a guide device in a bladeless fan nozzle according to an embodiment of the present application.

[0020] Figure 3 It is a schematic view of the nozzle guide vane structure of the bladeless fan in the embodiment of the present application.

[0021] Figure 4 It is a schematic view of the nozzle inlet opening structure of the nozzle of the bladeless fan in the embodiment of the present application.

[0022] Figure 5 It is a schematic view of the bladeless fan structure in the embodiment of the present application.

[0023] Figure 6 It is a partial structure sectional view of the bladeless fan in the embodiment of the present application.

[0024] In the figure, 1, a circular arc surface; 2, an air outlet; 3, a Coanda surface; 4, a diffusion surface; 5, a smooth surface; 6, an expansion surface; 7, a horizontal guide surface; 8, a guide device; 8a, a windward surface; 8b, a connecting circular arc segment; 8c, a leeward surface; 9, an air outlet path; 10, a vortex; 11, a housing; 12, a housing cross section; 13, a characteristic radius of the circular arc surface is R1; 14, a circular arc radius of the windward surface is R2; 15, an angle θ corresponding to the arc length of the windward surface; 16, a circular arc radius of the leeward surface is R3; 17, an angle β corresponding to the arc length of the leeward surface; 18, a bladeless fan nozzle inlet; 19, a bladeless fan power seat. DETAILED DESCRIPTION

[0025] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0026] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0027] The present application provides a bladeless fan nozzle, such as Figure 2 , Figure 3As shown, including the shell 11, the shell 11 is circular structure, the shell 11 along the circular axis of the shell 11 is the shell section 12, that is, the shell 11 is obtained by rotating the shell section 12 around the rotation center, the shell section 12 includes a horizontal guide surface 7, one end of the horizontal guide surface 7 is provided with a circular arc surface 1 tangent to the horizontal guide surface 7, the other end of the horizontal guide surface 7 is sequentially connected with an expansion surface 6, a smooth surface 5 and a diffusion surface 4, the end of the diffusion surface 4 is provided with a coanda surface 3, the end of the coanda surface 3 is spaced apart from the end of the circular arc surface 1, and the end of the coanda surface 3 and the end of the circular arc surface 1 form an exhaust port 2, the exhaust direction of the exhaust port 2 is towards the concave side of the circular arc surface 1, and the shell 11 is provided with a bladeless fan nozzle inlet 18 on the side of the horizontal guide surface 7; a power source for connecting the bladeless fan; the shell 11 with an internal cavity structure obtained by rotating the shell section 12 formed by the horizontal guide surface 7, the circular arc surface 1, the expansion surface 6, the smooth surface 5 and the diffusion surface 4, the exhaust port 2 is arranged at the end of the circular arc surface 1, the gas is shot out from the exhaust port 2 at high speed, and the coanda effect of the coanda surface 3 drives the airflow on the inside, which increases the airflow. Since the convex side of the circular arc surface 12 is the windward surface, it is in the form of a circular arc, which conforms to the airflow trajectory and can guide the airflow, reducing the turbulent energy loss; at the same time, part of the airflow flows from the windward surface to the leeward surface, forming low pressure on the leeward surface, which plays a role of suction, can converge the airflow, and plays a role of increasing the airflow.

[0028] The coanda surface 3 is a circular arc surface, and one end of the circular arc surface of the coanda surface 3 is tangent to the diffusion surface 4.

[0029] The shell 11 is obtained by rotating the shell section 12 around the rotation center, and the rotation center is the axis of the shell 11.

[0030] The outer ring of the shell 11 is provided with a ring of flow guiding device 8, the cross section of the flow guiding device 8 along the circular ring axis of the shell 11 is a flow guiding cross section, the flow guiding cross section comprises a windward face 8a and a leeward face 8c, the windward face 8a and the leeward face 8c are circular arc faces with different radii of curvature, one end of the circular arc of the windward face 8a is tangent to one end of the circular arc face 1, and the other end of the circular arc of the windward face 8a is tangent to the bottom of the horizontal guide face 7, one end of the circular arc of the leeward face 8c is tangent to the bottom of the horizontal guide face 7, and the other end of the circular arc of the windward face 8a is connected to the other end of the circular arc of the leeward face 8c through a connecting circular arc segment 8b, one end of the circular arc of the connecting circular arc segment 8b is tangent to the other end of the circular arc of the windward face 8a, and the other end of the circular arc of the connecting circular arc segment 8b is tangent to the other end of the circular arc of the leeward face 8c. When the gas is ejected at high speed from the air outlet 2, the airflow on the outside is affected by the flow of the internal airflow, part of the airflow flows to the inside along the circular arc face 1 and is affected by the Coanda effect together with the internal airflow, part of the airflow continues to flow to the outside along the windward face 8a of the flow guiding device and flows to the air outlet path 9 along the circular arc 8b, and a vortex 10 is formed on the leeward face 8c to form low pressure and suck the surrounding airflow to flow, thereby increasing the airflow.

[0031] The flow guiding device 8 of the present application is obtained by rotating the flow guiding cross section around the rotation center.

[0032] The circular arc face 1 is a semicircular structure, the characteristic radius of the circular arc face 1 is R1, the radius R2 of the circular arc of the windward face 8a is 0.4-0.6R1, and the radius R3 of the circular arc of the leeward face 8c is 1.5-2.5R1. The angle θ corresponding to the arc length of the windward face 8a is 95-130°, the angle β corresponding to the arc length of the leeward face 8c is 40-50°, and the circle corresponding to the windward face 8a and the circle corresponding to the leeward face 8c are tangent to each other.

[0033] Preferably, the radius R2 of the circular arc of the windward face 8a is 0.5R1, the shell 11 is obtained by rotating the shell cross section 12, the radius R3 of the circular arc of the leeward face 8c is 2R1, the angle θ corresponding to the arc length of the windward face 8a is 105°, the angle β corresponding to the arc length of the leeward face 8c is 45°, and the inlet included angle δ corresponding to the size of the bladeless fan nozzle inlet 18 formed on the shell 11 is 60°.

[0034] Preferably, in order to avoid the influence of sharp corners, the radius of the connecting circular arc segment 8b is less than 0.2 times the radius of the circular arc of the windward face 8a.

[0035] As shown in Figure 4 The inlet included angle δ corresponding to the size of the bladeless fan nozzle inlet 18 formed on the shell 11 is 10°-60°.

[0036] The present application provides a bladeless fan, as shown in Figure 4As shown, the no blade fan nozzle includes the no blade fan nozzle housing 11, the no blade fan nozzle housing 11 is provided with a no blade fan nozzle inlet 18 on one side of the horizontal guide surface 7, the no blade fan nozzle inlet 18 is connected with a no blade fan power seat 19, the no blade fan power seat 19 is a hollow structure, the no blade fan power seat 19 is provided with a power source, one end of the no blade fan power seat 19 is communicated with the inner cavity of the no blade fan nozzle housing 11, the gas enters the inner cavity of the no blade fan nozzle housing 11 from the no blade fan power seat 19, and other gases are shot out from the air outlet 2 at high speed, the airflow first passes through the coanda surface 3 and is driven by the coanda effect, so that the airflow on the inner side is increased, meanwhile, the airflow on the outer side is driven by the airflow on the inner side, part of the airflow flows to the inner side along the circular arc surface 1 and is driven by the coanda effect together with the airflow on the inner side. Part of the airflow continues to flow to the outer side along the windward surface 8a and flows to the air outlet path 9 along the circular corner 8b, and the vortex 10 is formed on the leeward surface 8c to form low pressure and suck the surrounding airflow to flow, so that the airflow is increased.

[0037] In an embodiment of the present application, in order to verify the flow effect of the structure at the inlet, the same power input is adopted, and the flow at the inlet of the existing no blade fan nozzle and the flow at the inlet of the no blade fan nozzle adopting the structure of the present application are compared. The characteristic radius R1 of the circular arc surface 1 is adopted, the circular arc radius R2 of the windward surface 8a is 0.5R1, R1 is 20mm, the no blade fan nozzle housing 11 is obtained by rotating the housing cross section 12, the rotation radius is 155mm, the circular arc radius R3 of the leeward surface 8c is 2R1, the angle θ corresponding to the arc length of the windward surface 8a is 105°, the angle β corresponding to the arc length of the leeward surface 8c is 45°, and the size of the no blade fan nozzle inlet 18 provided on the no blade fan nozzle housing 11 corresponds to the inlet included angle δ of 60°.

[0038] The comparison results are shown in Table 1.

[0039] Table 1 Comparison results of the flow at the inlet of the existing no blade fan nozzle and the flow at the inlet of the no blade fan nozzle adopting the structure of the present application

[0040]

[0041]

[0042] As can be seen from Table 1, under the same input flow, the no blade fan nozzle structure of the present application and the existing no blade fan nozzle structure are measured respectively, the air volume flow and mass flow under the same distance condition, it can be seen that the no blade fan nozzle structure of the present application can effectively improve the total flow and increase the airflow.

[0043] Finally, it should be noted that the above embodiments are merely intended for illustration, but not to limit the technical solutions of the present application. Although the present application has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that the present application can still be modified or equivalently replaced without departing from the spirit and scope of the present application, and the appended claims are intended to cover these modifications and equivalent replacements falling within the spirit and scope of the present application.

Claims

1. A bladeless fan nozzle characterized by, The application relates to a shell (11) which is in a circular ring structure and is obtained by rotating a shell section (12) around a rotation center, the shell section (12) comprises a horizontal guide surface (7), one end of the horizontal guide surface (7) is provided with a circular arc surface (1) tangent to the horizontal guide surface (7), the other end of the horizontal guide surface (7) is sequentially connected with an expansion surface (6), a smooth surface (5) and a diffusion surface (4), the end of the diffusion surface (4) is provided with a coanda surface (3), the end of the coanda surface (3) is spaced apart from the end of the circular arc surface (1) to form an air outlet (2), the air outlet direction of the air outlet (2) is towards the side of the concave surface of the circular arc surface (1), the outer ring of the shell (11) is provided with a ring of flow guide devices (8), the cross section of the flow guide devices (8) along the circular ring axis of the shell (11) is a flow guide cross section, the flow guide cross section comprises a windward surface (8a) and a leeward surface (8c), the windward surface (8a) and the leeward surface (8c) are circular arc surfaces with different radii of curvature, one end of the circular arc of the windward surface (8a) is tangent to one end of the circular arc surface (1), one end of the circular arc of the leeward surface (8c) is tangent to the bottom of the horizontal guide surface (7), the other end of the circular arc of the windward surface (8a) is connected with the other end of the circular arc of the leeward surface (8c) through a connecting circular arc segment (8b), one end of the circular arc of the connecting circular arc segment (8b) is tangent to the other end of the circular arc of the windward surface (8a), the other end of the circular arc of the connecting circular arc segment (8b) is tangent to the other end of the circular arc of the leeward surface (8c), the circular arc surface (1) is in a semicircular structure, the characteristic radius of the circular arc surface (1) is R1, the radius R2 of the circular arc of the windward surface (8a) is 0.4-0.6 R1, the radius R3 of the circular arc of the leeward surface (8c) is 1.5-2.5 R1, the angle theta corresponding to the arc length of the windward surface (8a) is 95-130 DEG, and the angle beta corresponding to the arc length of the leeward surface (8c) is 40-50 DEG.

2. A bladeless fan nozzle according to claim 1, wherein, A bladeless fan nozzle inlet (18) is formed on one side of the horizontal guide surface (7) of the shell (11).

3. A bladeless fan nozzle according to claim 1, wherein, The circle corresponding to the windward surface (8a) is circumscribed to the circle corresponding to the leeward surface (8c).

4. A bladeless fan nozzle according to claim 1, wherein, The radius of the connecting circular arc segment (8b) is smaller than 0.2 times the radius of the circular arc of the windward surface (8a).

5. A bladeless fan, comprising: The application further relates to a bladeless fan nozzle comprising the bladeless fan nozzle of any one of claims 1-4.

6. A bladeless fan as claimed in claim 5, wherein, The bladeless fan nozzle inlet (18) is connected with a bladeless fan power seat (19), the bladeless fan power seat (19) is in a hollow structure, a power source is arranged in the bladeless fan power seat (19), and one end of the bladeless fan power seat (19) is in communication with the inner cavity of the shell (11).

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