Noise reduction fan

Abstract

The utility model provides a noise reduction fan. The noise reduction fan comprises a shell. The fan assembly is arranged in the shell and comprises a volute part and an impeller arranged in the volute part, the volute part comprises a volute tongue and a mounting part, the impeller is mounted on the mounting part, and the volute tongue inclines relative to the normal direction of the mounting part. According to the embodiment of the utility model, the volute tongue is obliquely arranged relative to the volute part, so that interference noise and vortex noise caused by the fact that airflow generated by rotation of the impeller collides with the volute tongue can be reduced, and noise generated when the fan is used is reduced.

Description

Technical Field

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

[0002] Nowadays, in order to meet the needs of using fans in outdoor activities or other life scenarios, various portable fans have emerged on the market, such as hand-held fans, neck-mounted fans, clip-on fans, desktop fans, etc., to provide cool air for users. The neck-mounted fan frees the hands by hanging on the neck and is especially suitable for use during outdoor activities, exercise, or work, enabling users to enjoy cool air more conveniently.

[0003] In the existing neck-mounted fan, a blower is installed inside the fan housing. An air duct corresponding to the blower is provided inside the fan housing. An air outlet is provided on the side wall of the air duct. The air flow formed by the rotation of the fan enters the air duct and is blown out from the air outlet, thereby cooling the neck and nape of the human body. However, when in use, the fan will generate excessive noise, causing discomfort in use. The noise is generated due to the interference of the vortex air flow of the fan. In the narrowest area, these vortices combine to form so-called vortex lines. Then, these turbulences will impact the rotating blades and the volute part of the fan, generating noise. Summary of the Utility Model

[0004] In order to improve at least some of the above-mentioned disadvantages or deficiencies, an embodiment of the utility model provides a volute tongue that is inclined with respect to the mounting portion of the volute part, which can reduce the interference noise and vortex noise caused by the air flow impact on the volute part generated by the rotation of the impeller, so as to reduce the noise during the use of the fan.

[0005] On the one hand, an embodiment of the utility model provides a noise-reducing fan, including: a housing; a blower assembly disposed inside the housing, including a volute part and an impeller disposed inside the volute part. The volute part includes a volute tongue and a mounting portion. The impeller is mounted on the mounting portion, and the volute tongue is inclined with respect to the normal direction of the mounting portion.

[0006] In one embodiment, the volute tongue includes a root connected to the mounting portion and a top away from the mounting portion. Along the direction from the root to the top, the volute tongue gradually gets closer to or farther away from the impeller.

[0007] In one embodiment, the volute tongue includes a root connected to the mounting portion and a top away from the mounting portion. Along the direction from the root to the top, the volute tongue gradually gets closer to or farther away from the air outlet side of the volute part.

[0008] In one embodiment, along the direction from the root to the top, the volute tongue gradually gets farther away from the impeller, and the included angle between the volute tongue and the normal of the mounting portion is 20° to 30°.

[0009] In one embodiment, the scroll tongue is a curved structure.

[0010] In one embodiment, an air inlet grille is provided on the housing corresponding to the fan assembly. The air inlet grille includes a plurality of air inlet holes, and the plurality of air inlet holes are radially arranged from the center to the periphery and are curved; the impeller includes a plurality of blades, the blades are curved structures, and the bending direction of the air inlet holes is opposite to the bending direction of the blades.

[0011] In one embodiment, a cavity is formed between the scroll tongue and the side wall of the housing.

[0012] In one embodiment, an air guiding member is further included. The air guiding member is disposed on the air outlet side of the scroll housing portion and is located on the side of the air outlet side of the scroll housing portion away from the scroll tongue.

[0013] In one embodiment, a heat guiding member, a heat dissipating member, and a refrigerating member are further included. An air duct is formed in the housing, and a refrigerating air outlet and a heat dissipating air outlet communicated with the air duct are provided on the housing. The air outlet side of the scroll housing portion is communicated with the air duct; the refrigerating member is disposed in the air duct, and the refrigerating member includes a cold end and a hot end; the heat guiding member is disposed in the housing and is thermally conductively connected to the cold end; the heat dissipating member is disposed in the housing and is thermally conductively connected to the hot end, and the heat dissipating member faces the heat dissipating air outlet.

[0014] In one embodiment, the housing includes a connecting frame and two wearing arms respectively installed at both ends of the connecting frame. The connecting frame and the two wearing arms together form a wearing space; at least one of the wearing arms is provided with the fan assembly and the refrigerating member.

[0015] As can be seen from the above, the above technical features of the present invention may have one or more of the following beneficial effects: By providing a scroll tongue inclined with respect to the normal direction of the installation portion of the scroll housing portion, the interference noise and vortex noise caused by the airflow impact on the scroll housing portion generated by the rotation of the impeller can be reduced, so as to achieve the purpose of reducing excessive noise generated by the fan during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram of a noise reduction fan provided by an embodiment of the present invention.

[0018] Figure 2 Schematic exploded view of a noise reduction fan provided by an embodiment of the present utility model.

[0019] Figure 3 is Figure 1 schematic diagram of the structure of the blower assembly in

[0020] Figure 4 is Figure 1 another schematic diagram of the structure of the blower assembly in

[0021] Figure 5 is Figure 1 yet another schematic diagram of the structure of the blower assembly in

[0022] Figure 6 is Figure 3 schematic diagram of the structure of the blower assembly shown in another perspective.

[0023] Figure 7 is Figure 1 cross-sectional view of the wearing arm in

[0024]

Reference Signs

[0025] 10. Housing; 101. Connecting frame; 102. Wearing arm; 1021. Inner plate; 1022. Outer plate; 103. Air inlet grille; 104. Refrigeration air outlet; 105. Heat dissipation air outlet; 20. Blower assembly; 201. Volute part; 202. Impeller; 203. Volute tongue; 204. Installation part; 30. Heat conduction member; 40. Heat dissipation member; 50. Refrigeration member; 501. Cold end; 502. Hot end; 60. Air guiding part; 70. Air guiding member. Detailed Embodiments

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] As Figure 1 , Figure 2 , Figure 3As shown in the figure, a noise-reducing fan includes a housing 10 and a fan assembly 20. The fan assembly 20 is disposed within the housing 10. The fan assembly 20 includes a volute portion 201 and an impeller 202 disposed within the volute portion 201. The volute portion 201 includes a volute tongue 203 and a mounting portion 204. The volute portion 201 forms a receiving space, and the impeller 202 is disposed within the receiving space and mounted on the mounting portion 204. The impeller 202 rotates within the volute portion 201 to generate an air flow. The volute tongue 203 is inclined with respect to the normal direction of the mounting portion 204, that is, the volute tongue 203 is inclined with respect to the axial direction of the impeller 202, so that the air volume per unit area of the air flow passing through the volute tongue 203 is reduced, thereby reducing the pressure of the air flow on the volute tongue 203 and reducing noise. Among them, the volute portion 201 has an air outlet side, for example. The function of the volute portion 201 is to guide and accelerate the air flow generated by the impeller 202 so that the air flow can be discharged through the air outlet side of the volute portion 201. The volute tongue 203 plays a role in guiding and directing air in the structural design of the fan assembly 20. For example, the volute tongue 203 is inclined with respect to the normal direction of the mounting portion 204. A wind guiding portion 60 is connected to the volute tongue 203. The wind guiding portion 60 can further smooth the air flow, ensure that the air flow flows out of the fan assembly 20 evenly, and guide the blowing direction of the air flow.

[0028] Furthermore, the volute portion 201 is disposed within the housing 10, and a cavity is formed between the volute tongue 203 and the side wall of the housing 10, so as to effectively absorb the noise generated by the air flow hitting the volute tongue 203. In this embodiment, the volute portion 201 is a component independent of the housing 10. In other embodiments, the volute portion 201 may also be formed by the inner wall of the housing 10, that is, the inner side wall of the housing is designed in a volute shape, and the mounting portion 204 is the inner wall surface of the portion of the housing 10 where the impeller 202 is mounted, and the volute tongue 203 is formed by the extension of the inner wall of the housing 10. The volute tongue 203 and the wind guiding portion 60 are disposed within the housing 10, and the wind guiding portion 60 extends toward the side wall of the housing 10, so that the air outlet of the volute portion 201 is guided to the air duct within the housing 10 through the wind guiding portion 60 to ensure the air outlet direction.

[0029] During the operation of the fan assembly 20, the periodic air flow generated by the impeller 202 interacts with the volute tongue 203 to generate rotational noise. The volute tongue 203 is set to be inclined, the area of the air flow passing through the volute tongue 203 increases, and the air pressure per unit area received by the volute tongue 203 becomes smaller, thereby dispersing the air pressure and generating less noise. Moreover, the inclined design of the volute tongue 203 can make the air flow leave the volute portion 201 at a more reasonable angle, making the air inlet and outlet transition smoother. This helps to reduce the eddy current generated at the air outlet side of the volute portion 201. Eddy current is one of the main sources of noise, and reducing eddy current can effectively reduce the noise level.

[0030] That is, the noise reduction fan provided by the present application can reduce the interference noise and eddy current noise caused by the airflow impact of the impeller 202 on the volute tongue 203 by setting the volute tongue 203 to be inclined with respect to the normal direction of the mounting portion 204 (i.e., the axial direction of the impeller 202), achieving the purpose of reducing excessive noise generated by the fan during use. Such a fan assembly 20 can be applied to portable fans such as neck fans and hand-held fans that use centrifugal impellers, performing the function of reducing noise.

[0031] Further, as Figure 3 and Figure 4 shown, the volute tongue 203 includes a root connected to the mounting portion and a top away from the mounting portion. Along the direction from the root to the top, the volute tongue 203 gradually moves closer to or away from the impeller 202. The volute tongue 203 has a smooth transition from the root to the top, and it gradually moves away from or closer to the impeller 202, making the volute tongue 203 inclined, thereby reducing the airflow interference between the volute tongue 203 and the impeller 202. As another implementation manner, along the direction from the root to the top, the volute tongue 203 gradually moves closer to or away from the air outlet side of the volute casing portion 201. After the volute tongue 203 is inclined, the airflow on the air outlet side remains unchanged, and the airflow pressure received per unit area of the volute tongue 203 becomes smaller, thereby reducing noise. The air outlet side of the volute casing portion 201 is also the side where the airflow flows out of the volute casing portion 201.

[0032] Preferably, as Figure 6 shown, as the best embodiment, the volute tongue 203 gradually moves further away from the impeller 202 along the direction from the root to the top, and the included angle of the volute tongue 203 with respect to the normal of the mounting portion 204 is 20° to 30°. For example, the included angle b between the volute tongue 203 and the Figure 6 dashed line A in is 20° to 30°, and the dashed line A is the normal of the mounting portion 204. And the included angle of the volute tongue with respect to the normal of the mounting portion is 20° to 30°. With such a design, while ensuring the air volume at the air outlet, the airflow interference between the volute tongue 203 and the impeller 202 can be reduced, and the noise can be reduced.

[0033] As Figure 5 shown, in one embodiment, the volute tongue 203 is a curved structure, and the volute tongue 203 is curved with respect to the volute casing portion 201 in the direction towards the air outlet side of the volute casing portion 201, or the volute tongue 203 is curved with respect to the volute casing portion 201 in the direction away from the air outlet side of the volute casing portion 201. The design of the volute tongue 203 as an arc can reduce the sharp change of the airflow at the connection, thereby reducing noise and improving the uniformity of the airflow.

[0034] As Figure 1As shown, in one embodiment, an air inlet grille 103 is provided on the housing 10 corresponding to the fan assembly 20. The air inlet grille 103 includes a plurality of air inlet holes which are radially arranged from the center to the periphery and are curved; the impeller 202 includes a plurality of blades which are of a curved structure, and the bending direction of the air inlet holes is opposite to the bending direction of the blades. It can reverse the pre-rotation of the gas entering the fan assembly 20, change the movement mode of the air flow, increase the flow rate of the fan assembly 20, reduce the eddy current in the fan assembly 20, thereby improving the efficiency of the fan assembly 20 and reducing the noise.

[0035] In one embodiment, the neck fan further includes an air guiding member 70 which is arranged on the air outlet side of the volute portion 201 and is located on the side of the air outlet side of the volute portion 201 away from the volute tongue 203. The air guiding member 70 can guide the air flow generated by the impeller 202 so that the air flow flows out of the air outlet of the volute portion 201.

[0036] As Figure 2 , Figure 7 As shown, in one embodiment, the noise reduction fan further includes a heat conducting member 30, a heat dissipating member 40 and a refrigerating member 50. The heat conducting member 30 is, for example, a heat conducting silica gel sheet or a heat conducting metal, and the heat dissipating member is, for example, a heat dissipating fin. A wind channel (not shown in the figure) is formed in the housing 10, and a refrigerating air outlet 104 and a heat dissipating air outlet 105 communicating with the wind channel are provided on the housing 10, and the air outlet side of the volute portion 201 communicates with the wind channel. The refrigerating member 50 is arranged in the wind channel and includes a cold end 501 and a hot end 502. The heat conducting member 30 is arranged in the housing 10 and is thermally conductively connected to the cold end 501. The heat dissipating member 40 is arranged in the housing 10 and is thermally conductively connected to the hot end 502, and the heat dissipating member 40 faces the heat dissipating air outlet 105.

[0037] Specifically, the outside air flow enters from the air inlet grille 103, and the impeller 202 rotates to make the air flow flow from the air outlet side of the volute portion 201 to the cold end 501 of the refrigerating member 50, and the outside air flow becomes cold air flow and then flows out through the refrigerating air outlet 104, and the user can experience the cold air flow. At the same time, the rotation of the impeller 202 will also make the outside air flow flow from the air outlet side of the volute portion 201 to the hot end 502 of the refrigerating member 50, and the hot air flow generated by the hot end 502 of the refrigerating member 50 flows out through the heat dissipating air outlet 105, effectively discharging heat.

[0038] Among them, a wind channel is formed in the housing 10, and the wind channel is used to guide the flow of the air flow. The air outlet side of the volute portion 201, the refrigerating air outlet 104 and the heat dissipating air outlet 105 are all communicated with the wind channel, and the refrigerating member 50 is arranged in the wind channel. The air guiding portion 60 and the air guiding member 70 guide the air flow flowing out of the fan assembly 20 into the housing 10 and flow to the refrigerating member 50, and the air flow flows out of the housing 10 after passing through the heat conducting member 30 at the cold end 501 and the heat dissipating member 40 at the hot end 502 respectively.

[0039] Furthermore, the cold conduction member 30 conducts the cold quantity of the cold end 501 of the refrigeration member 50 to cool down the human body, so that the user's body feeling temperature can be improved by the cooperation of the refrigeration member 50 and the cold conduction member 30. That is, in addition to blowing cold air for refrigeration by the air flow blown out by the fan assembly 20 passing through the cold conduction member 30 at the cold end 501, the noise reduction fan can also achieve refrigeration by the cold conduction member 30 contacting the human neck. The two functions can be used separately or simultaneously, with diverse functions and improved cooling effect.

[0040] Furthermore, the air flow blown out by the fan assembly 20 passes through the heat dissipation member 40 to take away the heat of the hot end 502. By setting the heat dissipation member, the heat exchange area between the air flow blown out by the fan assembly 20 and the hot end 502 is increased, thereby improving the heat dissipation efficiency.

[0041] Among them, the refrigeration air outlet 104 is a strip-shaped hole air outlet, that is, the length of the refrigeration air outlet 104 is greater than its width. The strip-shaped air outlet is closer to the natural wind, making the human body more comfortable. It can not only increase the air outlet speed of the cold air, but also prevent the internal structure of the housing 10 from being exposed through the refrigeration air outlet 104. Moreover, due to its small opening, dust is not easily introduced into the interior of the housing 10 through the refrigeration air outlet 104. A plurality of refrigeration air outlets 104 are arranged at equal intervals, with uniform air outlet, giving users a better use experience. The heat dissipation air outlet 105 includes, for example, a plurality of heat dissipation holes or at least one heat dissipation opening in the shape of a long strip.

[0042] As Figure 1 shown, in one embodiment, the housing 10 includes a connecting frame 101 and two wearing arms 102 respectively installed at both ends of the connecting frame 101. The connecting frame 101 and the two wearing arms 102 jointly form a wearing space; at least one wearing arm 102 is provided with a fan assembly 20 and a refrigeration member 50. Preferably, for example, the fan assembly 20 and the refrigeration member 50 can be provided in both wearing arms 102, so as to increase the temperature adjustment efficiency of the noise reduction fan. In a specific implementation manner, for example, the fan assembly 20 and the refrigeration member 50 can also be provided in the connecting frame 101, and the present application does not specifically limit this. Among them, the side of the cold conduction member 30 away from the refrigeration member 50 faces the wearing space, so that when the fan is used, the cold conduction member 30 will contact the human skin to achieve cooling.

[0043] See again Figure 1, the wearing arm 102 includes an inner plate 1021 and an outer plate 1022. The refrigeration air outlet 104 is provided on the inner plate 1021 or between the inner plate 1021 and the outer plate 1022, and the heat dissipation air outlet 105 is provided on the outer plate 1022. The structures of the two wearing arms 102 are the same and are respectively bent and extended outward from both ends of the connecting frame 101. When the device is worn on the human neck, the connecting frame 101 is supported at the back of the human neck, and the two wearing arms 102 respectively extend to the left and right sides of the neck. The refrigeration air outlet 104 is provided on the inner plate 1021 close to the human body, and the heat dissipation air outlet 105 is provided on the outer plate 1022 away from the human body. That is, the air exhaust direction of the refrigeration air outlet 104 is set towards one direction of the human body, and the air exhaust direction of the heat dissipation air outlet 105 is set towards one direction away from the human body. The air blown out by the fan assembly 20 becomes cold air after passing through the cold end 501 of the refrigeration element 50 and finally blows towards the human body from the refrigeration air outlet 104. The air blown out by the fan assembly 20 passes through the hot end 502 of the refrigeration element 50, and the generated hot air flow is finally discharged from the heat dissipation air outlet 105.

[0044] In summary, the fan provided by the present application can reduce the interference noise and eddy current noise caused by the airflow impact of the volute part 201 generated by the rotation of the impeller 202 by setting the volute tongue 203 inclined relative to the installation part 204 of the volute part 201, so as to achieve the purpose of reducing excessive noise generated by the fan during use.

[0045] In addition, it can be understood that the foregoing various embodiments are only exemplary descriptions of the present utility model. On the premise that the technical features do not conflict, the structures do not contradict, and the invention purpose of the present utility model is not violated, the technical solutions of the various embodiments can be arbitrarily combined and used.

[0046] In several embodiments provided by the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point, the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces, and the indirect coupling or communication connection of the device or unit can be in an electrical, mechanical or other form.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A noise reduction fan, characterized in that: include: Housing (10); A fan assembly (20) is arranged in the housing (10), comprising a volute portion (201) and an impeller (202) arranged in the volute portion (201), wherein the volute portion (201) comprises a volute tongue (203) and a mounting portion (204), wherein the impeller (202) is mounted on the mounting portion (204), and the volute tongue (203) is inclined relative to a normal direction of the mounting portion (204).

2. The noise reduction fan according to claim 1, characterized in that: The volute tongue (203) comprises a root portion connected to the mounting portion (204) and a top portion away from the mounting portion (204); along the direction from the root portion to the top portion, the volute tongue (203) gradually gets closer to or farther away from the impeller (202).

3. The noise reduction fan according to claim 1, characterized in that: The volute tongue (203) comprises a root portion connected to the mounting portion (204) and a top portion away from the mounting portion (204); along the direction from the root portion to the top portion, the volute tongue (203) gradually moves closer to or farther away from the air outlet side of the volute portion (201).

4. The noise reduction fan according to claim 2, characterized in that: Along the direction from the root to the top, the volute tongue (203) gradually moves away from the impeller (202), and an angle between the volute tongue (203) and the normal line of the mounting portion (204) is 20° to 30°.

5. The noise reduction fan according to claim 2, characterized in that: The volute tongue (203) is a curved structure.

6. The noise reduction fan according to any one of claims 1 to 5, characterized in that: An air inlet grille (103) is provided on the shell (10) at a position corresponding to the fan assembly (20), and the air inlet grille (103) includes a plurality of air inlet holes, and the plurality of air inlet holes are radially arranged from the center to the surroundings, and the air inlet holes are arranged in a curved manner; the impeller (202) includes a plurality of blades, and the blades are of a curved structure, and the curvature direction of the air inlet holes is opposite to the curvature direction of the blades.

7. The noise reduction fan according to any one of claims 1 to 5, characterized in that: A cavity is formed between the volute tongue (203) and the side wall of the housing (10).

8. The noise reduction fan according to claim 7, characterized in that: It also includes an air induction member (70), which is arranged on the air outlet side of the volute portion (201) and is located on the air outlet side of the volute portion (201) away from the volute tongue (203).

9. The noise reduction fan according to any one of claims 1 to 5, characterized in that: The invention also comprises a cooling member (30), a heat dissipation member (40) and a refrigeration member (50); an air duct is formed in the shell (10); a cooling air outlet (104) and a heat dissipation air outlet (105) which are in communication with the air duct are arranged on the shell (10); the air outlet side of the volute (201) is in communication with the air duct; the refrigeration member (50) is arranged in the air duct; the refrigeration member (50) comprises a cold end (501) and a hot end (502); the cooling member (30) is arranged in the shell (10) and is thermally connected to the cold end (501); the heat dissipation member (40) is arranged in the shell (10) and is thermally connected to the hot end (502); the heat dissipation member (40) is arranged towards the heat dissipation air outlet (105).

10. The noise reduction fan according to claim 9, characterized in that: The shell (10) comprises a connecting frame (101) and two wearing arms (102) respectively mounted at two ends of the connecting frame (101); the connecting frame (101) and the two wearing arms (102) together form a wearing space; and the fan assembly (20) and the refrigeration component (50) are arranged in at least one of the wearing arms (102).

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