Noise reduction type fan

Abstract

The utility model discloses a noise reduction type fan which comprises a shell and a fan body, and the fan body is arranged in the shell. The shell is provided with an air inlet part opposite to the fan body, an air inlet is formed in the air inlet part, and an air outlet is formed in the shell; the inner surface of the air inlet part is a concave face which is concave in the direction away from the fan body, and an air inlet space is formed between the air inlet side of the fan body and the concave face. The air inlet part opposite to the fan body is arranged on the shell, the air inlet is formed in the air inlet part, the inner surface of the air inlet part is matched with the concave surface which is concave in the direction away from the fan body, and the air inlet space is formed between the air inlet side of the fan body and the concave surface, so that the fan has a high air inlet height; therefore, vortexes can be effectively reduced, the vortexes are prevented from impacting rotating blades of the fan to generate noise as much as possible, and the purpose of reducing noise is achieved.

Description

Technical Field

[0001] The utility model relates to the technology of fans, in particular to a noise-reducing fan. Background Art

[0002] With the arrival of the sweltering summer, people often sweat profusely when walking or exercising outdoors, especially in the face or neck area. Some people will use towels for ice application to cool down, or use fans to cool down. However, the above methods are not suitable for outdoor activity people to implement. Therefore, portable fans have emerged on the market, such as neck fans, which are small and portable, do not require both hands, and can bring convenience to users' travel while being able to blow air to cool down. Therefore, they are deeply loved by consumers.

[0003] Current fans usually have air inlets and outlets. When the fan works, air flows in from the air inlet, is cooled by a semiconductor refrigeration component, and then cold air is blown out through the air outlet. During the use of the fan, the airflow generated by the fan will form eddies in a narrow area. These eddies will combine to form eddy lines, and then these eddies will impact the rotating blades of the fan, thereby generating noise and bringing a bad user experience to users. Therefore, it is necessary to improve the existing fans. Summary of the Utility Model

[0004] In view of this, aiming at the deficiencies existing in the prior art, the main purpose of the utility model is to provide a noise-reducing fan, which can effectively solve the problem that the existing fan generates noise during use and brings a bad user experience to users.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A noise-reducing fan includes a housing and a fan main body. The fan main body is arranged in the housing. The housing has an air inlet part opposite to the fan main body. An air inlet is opened on the air inlet part, and the housing is provided with an air outlet. The inner surface of the air inlet part is a concave surface recessed in the direction away from the fan main body, and an air inlet space is formed between the air inlet side of the fan main body and the concave surface.

[0007] As a preferred solution, the outer surface of the air inlet part bulges outwards.

[0008] As a preferred solution, the air inlet part is an arc-shaped air inlet part or a cylindrical air inlet part.

[0009] As a preferred solution, the concave surface is an arc surface.

[0010] As a preferred solution, the height of the air inlet space is one-eighth to two-fifths of the diameter of the air inlet part.

[0011] As a preferred solution, the height of the air inlet space is one quarter of the diameter of the air inlet portion.

[0012] As a preferred solution, the fan body is a centrifugal fan.

[0013] As a preferred solution, the air inlet portion is provided with a through hole for fixing the fan body with screws.

[0014] As a preferred solution, the outer surface of the air inlet portion is provided with a cavity inwardly, and the through hole opens the bottom of the cavity; further comprising a cap, which is arranged in the cavity.

[0015] As a preferred solution, the shell includes a neck-mounted portion and wearing arms located at both ends, the air inlet is located at one end of the wearing arm, and the air outlet is opened on the wearing arm; a refrigeration module is provided in the shell, and the refrigeration module is located between the air inlet and the air outlet.

[0016] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that:

[0017] By arranging an air inlet portion opposite to the fan body on the shell, an air inlet is opened on the air inlet portion, and the inner surface of the air inlet portion is a concave surface that is recessed away from the fan body, an air inlet space is formed between the air inlet side of the fan body and the concave surface, so that it has a higher air inlet height, thereby effectively reducing eddy currents and avoiding as much as possible the eddy currents from hitting the rotating blades of the fan and generating noise, thereby achieving the purpose of reducing noise.

[0018] In order to more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of an assembly perspective view of a preferred embodiment of the present utility model;

[0020] Figure 2 This is a schematic three-dimensional assembly diagram of a preferred embodiment of the present invention from another angle;

[0021] Figure 3 This is a schematic three-dimensional assembly diagram of a preferred embodiment of the present invention from another angle;

[0022] Figure 4 This is an exploded view of a preferred embodiment of the present utility model;

[0023] Figure 5 It is a cross-sectional view of a preferred embodiment of the present utility model.

[0024] Description of the drawing reference numerals:

[0025] 10. Housing; 101. Inner housing

[0026] 102. Outer housing; 11. Air inlet part

[0027] 111. Concave surface; 112. Concave cavity

[0028] 113. Through hole; 114. Avoidance hole

[0029] 12. Air inlet; 13. Air outlet

[0030] 14. Neck-wearing part; 15. Wearing arm

[0031] 16. Air inlet space; 20. Control module

[0032] 30. Fan main body; 40. Refrigeration module

[0033] 50. Cap Detailed implementation manners

[0034] Please refer to Figures 1 to 5 as shown, which shows the specific structure of the preferred embodiment of the present utility model, including a housing 10, a control module 20 and a fan main body 30, and the fan main body 30 is a centrifugal fan.

[0035] The housing 10 has an air inlet part 11 opposite to the fan main body 30, and the inner surface of the air inlet part 11 is a concave surface 111 that is recessed away from the fan main body 30. An air inlet 12 is formed on the air inlet part 11, and the shape of the air inlet 12 is circular. The shape of the air inlet 12 is not limited, and it can also be spiral, strip-shaped, grid-shaped or other shapes, which will not be elaborated here.

[0036] The housing 10 is provided with an air outlet 13; the fan main body 30 is arranged inside the housing 10, and the air inlet side of the fan main body 30 corresponds to the air inlet 12. Air flows into the housing 10 from the air inlet and is blown out from the air outlet 13 by the fan main body 30.

[0037] The inner surface of the air inlet part 11 is a concave surface 111 that is recessed away from the fan main body 30, and the air inlet side of the fan main body 30 and the concave surface 111 form an air inlet space 16. The air inlet space enables the air inlet side of the fan main body 30 to have a relatively high air inlet height, and as much as possible avoids the eddy current generated at the air inlet 12 from hitting the rotating blades of the fan, thereby reducing noise.

[0038] In this embodiment, the height of the air inlet space 16 is one-eighth to two-fifths of the diameter of the air inlet portion 11. Specifically, the height of the air inlet space 16 is one-fourth of the diameter of the air inlet portion 11, and this distance is the best distance for noise reduction effect, with the least noise reduction.

[0039] In this embodiment, the outer surface of the air inlet portion 11 bulges outward to form the air inlet space 16, and the thickness of the housing 10 can be ensured. Specifically, the air inlet portion 11 is an air inlet portion 11 with an arc-shaped surface or a cylindrical air inlet portion 11, corresponding to the circle of the fan main body 30; and the range of the air inlet portion 11 is greater than or equal to the fan main body 30 to ensure its air inlet area. When the air inlet portion 11 is an arc-shaped surface, it is connected to the housing 10 in an arc shape; when the air inlet portion 11 is cylindrical, its outer circumference is a cylindrical surface, and the top surface can be an arc surface or a flat straight surface. And the concave surface 111 is an arc surface.

[0040] In addition, through holes 113 for screw-fixing the fan main body 20 are provided on the outer surface of the air inlet portion 11, and screws pass through the through holes 113 to fix the fan main body 20 on the housing. At the same time, the air inlet portion 11 may optionally be provided with avoidance holes for avoiding the rotation shaft of the fan main body 20.

[0041] Further, a concave cavity 112 is recessed inward on the outer surface of the air inlet portion 11, and the through holes 113 and the avoidance holes are provided on the bottom surface of the concave cavity 112. A cap 50 is also provided on the housing 10, and the cap 50 is disposed in the concave cavity 112 for covering the screws and the through holes for fixing the fan main body 20 to keep the appearance of the air inlet portion 11 flat.

[0042] Moreover, the housing 10 has a neck-wearing portion 14, and wearing arms 15 are extended at both ends of the neck-wearing portion 14. The air inlet portion 11 is located at one end of the wearing arm 15, and the air outlet 13 is opened on the wearing arm 15; a refrigeration module 40 is provided in the housing 10, and the refrigeration module 40 is located between the air inlet 12 and the air outlet 13. The refrigeration module 40 is a semiconductor refrigeration module; the housing 10 includes an inner housing 101 and an outer housing 102, and the inner housing 101 and the outer housing 102 are fixedly joined to each other, and the inner housing 101 and the outer housing 102 are both provided with the aforementioned air inlet portion 11. The control module 20 is disposed in the housing 10, and the control module 20 is connected to the refrigeration module 40. The fan main body 30 is disposed in the housing 10 and is connected to the control module 20.

[0043] The design focus of the present utility model is that an air inlet portion opposite to the fan body is provided on the shell, an air inlet is opened on the air inlet portion, and the inner surface of the air inlet portion is a concave surface that is recessed away from the fan body. An air inlet space is formed between the air inlet side of the fan body and the concave surface, so that it has a higher air inlet height, thereby effectively reducing eddy currents and avoiding as much as possible the eddy currents from hitting the rotating blades of the fan and generating noise, thereby achieving the purpose of reducing noise.

[0044] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A noise-reducing fan, characterized in that: It includes a housing and a fan body, and the fan body is arranged inside the housing; the housing has an air inlet part opposite to the fan body, an air inlet is formed in the air inlet part, and the housing is provided with an air outlet; the inner surface of the air inlet part is a concave surface recessed in a direction away from the fan body, and an air inlet space is formed between the air inlet side of the fan body and the concave surface.

2. The noise reduction type fan according to claim 1, wherein: The outer surface of the air inlet part bulges outwards.

3. The noise reduction type fan according to claim 2, characterized in that: The air inlet part is an arc-shaped air inlet part or a cylindrical air inlet part.

4. The noise reduction type fan according to claim 1, characterized in that: The concave surface is an arc surface.

5. The noise-reducing fan according to claim 1, wherein: The height of the air inlet space is one-eighth to two-fifths of the diameter of the air inlet part.

6. The noise reduction type fan according to claim 5, characterized in that: The height of the air inlet space is one-fourth of the diameter of the air inlet part.

7. The noise reduction type fan according to claim 1, wherein: The fan body is a centrifugal fan.

8. The noise reduction type fan according to claim 1, wherein: The air inlet part is provided with through holes for screwing and fixing the fan body.

9. The noise-reducing fan according to claim 8, wherein: The outer surface of the air inlet part is recessed inwards to form a concave cavity, and the through holes are opened at the bottom of the concave cavity; further included is a cap, and the cap is arranged in the concave cavity.

10. The noise reduction type fan according to any one of claims 1-9, characterized in that: The housing includes a neck-wearing part and wearing arms at both ends of the neck-wearing part, the air inlet part is located at one end of the wearing arm, and the air outlet is opened on the wearing arm; a refrigeration module is arranged inside the housing, and the refrigeration module is located between the air inlet and the air outlet.

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