Silent fan

Abstract

The utility model provides a silent type fan which comprises a shell, a wind wheel is rotationally installed in an inner cavity of the shell, the wind wheel is connected with a motor installed on the outer side of the shell, the wind wheel comprises a wind wheel shell and a hub, a plurality of main blades are arranged on the peripheral face of the hub at intervals in the circumferential direction, one end of each main blade is fixed to the outer wall of the hub, and the other end of each main blade is fixed to the outer wall of the hub. The other ends of the main blades are fixed to the inner wall of the wind wheel shell, the main blades are bent in the direction opposite to the rotating direction of the wind wheel, and auxiliary blades are arranged between the adjacent pair of main blades. Air flowing to the outer edges of the main blades is guided by the auxiliary blades which are alternately arranged in the opposite direction, and therefore noise generated by concentration of the air at the outer edges of the main blades and collision between the air and the inner wall of the wind wheel shell can be reduced; meanwhile, the air is guided to flow in the opposite direction through the auxiliary blades, the air is prevented from being concentrated on the outer edges of the main blades, and the effect of promoting air flowing to improve the air flowing performance is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan technical field, concretely relates to a mute type fan. BACKGROUND

[0002] The fan is a kind of machinery that relies on input mechanical energy to improve gas pressure and discharge gas, it is a driven fluid machinery.The fan is local ventilation equipment when being used in factory building and indoor, mainly used to discharge indoor turbid gas, inhale fresh air, to achieve the effect of ventilation.

[0003] In the related prior art, the blade shape of the impeller in the axial fan is usually a single shape, such as a forward-swept blade or a backward-swept blade.Forward-swept blades are curved towards the direction of rotation of the impeller, and backward-swept blades are curved towards the opposite direction of rotation of the impeller.For axial fans with forward-swept blades, they have higher efficiency in low-speed mode, but when the speed is 4500RPM or higher, the efficiency of axial fans with forward-swept blades is affected and reduced;Therefore, in high-speed mode, axial fans with backward-swept blades are usually used.However, for axial fans equipped with backward-swept blades, there is a large air resistance at the gap between the front end edge of the blade and the inner wall of the fan housing, which consumes a lot of energy, and because the blade needs to overcome air resistance when rotating, it produces a lot of noise. SUMMARY

[0004] In view of the defects in the prior art, the purpose of the utility model is to provide a mute type fan to solve the problem of poor air flow performance caused by the single shape of the impeller blades in the existing fan.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] The utility model provides a mute type fan, characterized by comprising a shell, an air inlet and an air outlet are respectively arranged on the adjacent two sides of the shell, an impeller is rotatably installed in the inner cavity of the shell, and the impeller is connected with a motor installed on the outer side of the shell.

[0007] The impeller comprises an impeller shell and a hub, a plurality of main blades are arranged on the outer circumferential surface of the hub in the circumferential direction, one end of the main blade is fixed to the outer wall of the hub, the other end of the main blade is fixed to the inner wall of the impeller shell, the main blade is curved in the direction opposite to the rotation direction of the impeller, a pair of adjacent main blades are provided with a secondary blade, one end of the secondary blade is fixedly installed on the inner wall of the impeller shell, the other end of the secondary blade extends towards the center of the impeller shell, and the secondary blade is curved in the same direction as the rotation direction of the impeller.

[0008] Furthermore, the rear and front sides of the auxiliary blades gradually bend from the outer edge to the inner edge, and the bending direction is in the same direction as the rotation direction of the wind turbine housing.

[0009] Furthermore, the degree of curvature of the front side of the secondary blade is greater than the degree of curvature of the rear side.

[0010] Furthermore, air guide rings are installed at the air inlet and air outlet respectively.

[0011] Furthermore, a motor mounting base is installed on the outer side of the housing. The motor mounting base includes a connecting part and a motor mounting part. The connecting part and the motor mounting part form a through mounting hole. The connecting part is fixedly installed on the outer side of the housing, and the motor is fixedly installed on the motor mounting part. The output shaft of the motor is accommodated in the mounting hole.

[0012] Furthermore, the external dimensions of the connecting part are larger than the external dimensions of the motor mounting part.

[0013] The beneficial effects of this utility model are as follows:

[0014] The impeller of the wind turbine has main blades and secondary blades arranged at intervals. The main blades adopt a backward-sweeped blade structure, and the secondary blades adopt a forward-sweeped blade structure. The air flowing to the outer edge of the main blades is guided in the opposite direction by the alternately arranged secondary blades. Therefore, it can reduce the concentration of air at the outer edge of the main blades and the noise generated by the collision between the air and the inner wall of the impeller casing. At the same time, by guiding the air to flow in the opposite direction through the secondary blades, the air is prevented from concentrating at the outer edge of the main blades, thereby promoting airflow and improving airflow performance. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the silent fan in the embodiments of this application.

[0016] Figure 2 This is a three-dimensional structural diagram of the silent fan in another angle direction in the embodiments of this application.

[0017] Figure 3 This is a three-dimensional structural diagram of the motor mounting base in an embodiment of this application.

[0018] Figure 4 This is a schematic diagram of the wind turbine structure in an embodiment of this application.

[0019] Figure 5 for Figure 4 A magnified schematic diagram of the structure at point A in the diagram.

[0020] In the picture:

[0021] 10-Silent type fan;

[0022] 100 - Outer casing, 101 - Air inlet, 102 - Air outlet;

[0023] 200-Air guide ring;

[0024] 300-Wind rotor, 301-Wind rotor casing, 302-Hub, 303-Main blade, 304-Secondary blade, 3041-Front side, 3042-Rear side, 3043-Outer edge, 3044-Inner edge;

[0025] 400-Motor;

[0026] 500 - Motor mounting base, 501 - Connecting part, 502 - Motor mounting part, 503 - Mounting hole. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] See appendix Figure 1 To be continued Figure 2 As shown, this embodiment provides a silent fan 10, including a housing 100. An air inlet 101 and an air outlet 102 are respectively provided on two adjacent sides of the housing 100. For example, an air inlet 101 is provided on the front side of the housing 100, and an air outlet 102 is provided on the right side of the housing 100. External air enters the inner cavity of the housing 100 through the air inlet 101 and flows out of the inner cavity of the housing 100 through the air outlet 102. The air inlet 101 and the air outlet 102 are connected to the inner cavity of the housing 100. To improve airflow at the air outlet 102 and the air inlet 101, air guide rings 200 are installed at the air inlet 101 and the air outlet 102.

[0029] A fan wheel 300 is installed inside the cavity of the outer casing 100. The fan wheel 300 can rotate relative to the cavity of the outer casing 100. The fan wheel 300 is used to generate suction in the cavity of the outer casing 100 so as to draw outside (outdoor) air from the air inlet 101 into the cavity of the outer casing 100 and exhaust it from the air outlet 102, thus injecting fresh air into the room where the fan is located. A motor 400 is installed on the rear side of the outer casing 100. The motor 400 is used to provide power for the rotation of the fan wheel 300.

[0030] Combined with reference to the appendix Figure 4 and attached Figure 5As shown, in this embodiment, the wind turbine 300 includes a turbine housing 301 and a hub 302. The turbine housing 301 has a cylindrical shape, and the hub 302 is installed at the center of the inner cavity of the turbine housing 301. The hub 302 is connected to the output shaft of the motor 400. Multiple main blades 303 are arranged between the inner wall of the turbine housing 301 and the outer circumferential surface of the hub 302. The main blades 303 are evenly spaced along the circumferential direction, and auxiliary blades 304 are installed between adjacent pairs of main blades 303.

[0031] One end of the main blade 303 is fixedly mounted on the outer circumferential surface of the hub 302, and the other end of the main blade 303 extends towards the inner wall of the wind turbine housing 301, and is fixed to the inner wall of the wind turbine housing 301. Thus, when the motor 400 drives the hub 302 to rotate, the rotating hub 302 will synchronously drive the wind turbine housing 301 to rotate. The main blade 303 is bent in the opposite direction to the rotation of the wind turbine, meaning the main blade 303 is a back-swept blade structure.

[0032] One end of the auxiliary blade 304 is fixedly installed on the inner wall of the wind turbine housing 301, and the other end of the auxiliary blade 304 extends toward the center of the wind turbine housing 301. The auxiliary blade 304 is bent in the same direction as the wind turbine rotation direction, that is, the auxiliary blade 304 is a forward-swept blade structure.

[0033] When the wind turbine rotates, the air flowing to the outer edge of the main blade 303 is guided in the opposite direction by the alternately arranged secondary blades 304. This can reduce the noise generated by the concentration of air at the outer edge of the main blade 303 and the collision between the air and the inner wall of the wind turbine housing 301. At the same time, by guiding the air to flow in the opposite direction through the secondary blades 304, the air is prevented from concentrating at the outer edge of the main blade 303, thereby promoting airflow and improving airflow performance.

[0034] Continue to refer to the appendix Figure 4 and attached Figure 5 As shown, the rear side 3042 and the front side 3041 of the auxiliary blade 304 gradually bend from the outer edge 3043 to the inner edge 3044, respectively. The bending direction is the same as the rotation direction of the wind turbine housing 301, and the bending degree of the front side 3041 of the auxiliary blade 304 is greater than that of the rear side 3042. Through this shape structure design, the auxiliary blade 304 has a better effect on promoting the flow of air accumulated at the outer edge of the main blade 303, that is, it accelerates the flow of air that converges at the outer edge of the main blade 303 and the inner wall of the wind turbine housing 301.

[0035] See attached document Figure 2 and attached Figure 3As shown, to facilitate the installation of the motor 400 on the housing 100, a motor mounting base 500 is detachably and fixedly installed on the rear side of the housing 100. The motor mounting base 500 includes a connecting portion 501 and a motor mounting portion 502. Both the connecting portion 501 and the motor mounting portion 502 form a through mounting hole 503. The connecting portion 501 is fixedly installed on the outside of the housing 100. For example, screw holes are correspondingly formed on the connecting portion 501 and the rear side of the housing 100. The connecting portion 501 is fixed to the housing 100 by installing screws into the screw holes; or it can be fixed to the housing 100 by welding. The motor 400 is fixedly installed on the motor mounting portion 502, and the output shaft of the motor 400 is accommodated within the mounting hole 503. In some embodiments, the external dimensions of the connecting portion 501 are larger than the external dimensions of the motor mounting portion 502, which further facilitates the installation of the motor mounting base 500 on the housing 100, thus facilitating the operator's installation operation.

[0036] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A silent fan, characterized in that, The device includes an outer casing, with an air inlet and an air outlet respectively opened on adjacent sides of the outer casing. A fan wheel is rotatably installed in the inner cavity of the outer casing, and the fan wheel is connected to a motor installed on the outer side of the outer casing. The wind turbine includes a turbine housing and a hub. Multiple main blades are spaced apart on the outer circumferential surface of the hub. One end of each main blade is fixed to the outer wall of the hub, and the other end is fixed to the inner wall of the turbine housing. The main blades are bent in the opposite direction to the rotation direction of the wind turbine. A secondary blade is provided between adjacent pairs of main blades. One end of each secondary blade is fixedly installed on the inner wall of the turbine housing, and the other end extends toward the center of the turbine housing. The secondary blades are bent in the same direction as the rotation direction of the wind turbine.

2. The silent fan according to claim 1, characterized in that, The rear and front sides of the auxiliary blades gradually bend from the outer edge to the inner edge, respectively, and the bending direction is in the same direction as the rotation direction of the wind turbine housing.

3. The silent fan according to claim 2, characterized in that, The degree of curvature on the front side of the secondary blade is greater than that on the rear side.

4. A silent fan according to any one of claims 1 to 3, characterized in that, Air guide rings are installed at the air inlet and air outlet respectively.

5. A silent fan according to any one of claims 1 to 3, characterized in that, A motor mounting base is installed on the outer side of the housing. The motor mounting base includes a connecting part and a motor mounting part. The connecting part and the motor mounting part form a through mounting hole. The connecting part is fixedly installed on the outer side of the housing. The motor is fixedly installed on the motor mounting part. The output shaft of the motor is accommodated in the mounting hole.

6. A silent fan according to claim 5, characterized in that, The external dimensions of the connecting part are larger than the external dimensions of the motor mounting part.

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