Outer cover, fan single body and ventilating fan

Abstract

The invention provides an outer cover, a fan single body and a ventilator. The noise reduction structural member is provided with an air inlet, a flat plate part and a peripheral part surrounding the flat plate part. The side wall of the flat plate portion extends in the vertical direction from the peripheral portion. The bottom surface of the flat plate part extends in the horizontal direction from the side wall, and the bottom surface of the flat plate part is a plane. The cover body is arranged on the peripheral part and covers the air inlet.

Description

Technical Field

[0001] The present disclosure relates to an outer cover, a fan unit, and a ventilating fan having the outer cover and the fan unit. Background Art

[0002] Generally speaking, the product characteristics of ventilation fans are mainly related to air volume, noise and power consumption, among which the noise level is the most direct for users to feel. In the innovative products, the increase in air volume within the limited product size comes at the cost of increased noise.

[0003] Therefore, the inventor has proposed a noise reduction mechanism to meet the demand for increasing air volume within the original product size, which can be used in a ventilation fan. Summary of the invention

[0004] According to some embodiments of the present disclosure, an outer cover includes a noise reduction structure and a cover body. The noise reduction structure has an air inlet, a flat plate portion, and a peripheral portion surrounding the flat plate portion. The side wall of the flat plate portion extends vertically from the peripheral portion. The bottom surface of the flat plate portion extends horizontally from the side wall, and the bottom surface of the flat plate portion is a plane. The cover body is disposed on the peripheral portion and covers the air inlet.

[0005] According to some embodiments of the present disclosure, a fan unit includes a motor, an impeller, and a vortex flow channel. The impeller is connected to the motor. The vortex flow channel surrounds the impeller along a circumferential direction of the impeller and has an air outlet. The top of the vortex flow channel includes a curved surface, and the diameter and cross-sectional height of the curved surface increase from the air outlet along the circumferential direction to a region, and the region is passed by a cross section passing through the center of the impeller and parallel to the air outlet.

[0006] According to some embodiments of the present disclosure, a ventilation fan includes a housing, a fan unit and an outer cover. The upper edge of the housing surrounds an opening. The fan unit is located in the housing and includes a motor, an impeller and a vortex flow channel. The impeller is connected to the motor. The vortex flow channel surrounds the impeller along a circumferential direction of the impeller and has an air outlet. The top of the vortex flow channel includes a curved surface, the diameter and cross-sectional height of the curved surface increase from the air outlet along the circumferential direction to an area, and the area passes through a cross section passing through the center of the impeller and parallel to the air outlet. The outer cover is located at the upper edge of the housing and covers the opening. The outer cover includes a noise reduction structural member and a cover body. The noise reduction structural member has an air inlet, a flat plate portion and a surrounding portion surrounding the flat plate portion. A side wall of the flat plate portion extends from the surrounding portion in a vertical direction, the bottom surface of the flat plate portion extends from the side wall in a horizontal direction, and the bottom surface of the flat plate portion is a plane. The cover body is arranged on the surrounding portion and covers the air inlet.

[0007] In the above-mentioned embodiment of the present disclosure, since the outer cover includes a noise reduction structural member, and the noise reduction structural member has an air inlet and a flat plate portion, the noise reduction structural member has a rectifying effect before the airflow enters the fan unit, so that the airflow is concentrated to form an air column, and the airflow can smoothly enter the vortex flow channel of the fan unit. The flat plate portion of the noise reduction structural member is equivalent to an additional sound insulation structure, which can reduce the energy of the noise sound wave. Between the flat plate portion and the cover body and between the flat plate portion and the bottom of the shell, a sound wave path difference generated by two resonance spaces is formed. In this way, the airflow can resonate in the resonance space, so that the sound waves collide repeatedly and diffuse, and the energy is gradually weakened to improve the noise. In addition, since the top of the vortex flow channel of the fan unit includes a curved surface, and the diameter and cross-sectional height of this curved surface increase in the circumferential direction from the air outlet, different sound wave path differences can be generated in the vortex flow channel, so as to achieve the noise reduction effect of reverse synthesis of sound waves. In addition, since the top of the vortex flow channel has a convex feature, the space inside the flow channel is increased, thereby achieving the effect of increasing the air volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] When read together with the accompanying drawings, the aspects of the present disclosure can be best understood from the following embodiments. Note that according to standard practice in this industry, various features are not drawn to scale. In fact, the size and proportion of various features may be arbitrarily increased or reduced for clarity of discussion.

[0009] Figure 1 is a three-dimensional diagram of a ventilating fan according to an embodiment of the present disclosure;

[0010] Figure 2 for Figure 1 A cross-sectional view of the ventilation fan along line segment 2-2;

[0011] Figure 3 for Figure 1 Exploded view of the ventilation fan;

[0012] Figure 4A for Figure 3 a perspective view of the outer cover as viewed from below;

[0013] Figure 4B for Figure 4A An exploded view of the outer cover;

[0014] Figure 5 is a cross-sectional view of a ventilating fan according to another embodiment of the present disclosure;

[0015] Figure 6 for Figure 5 a three-dimensional view of an outer cover;

[0016] Fig. 7A for Figure 6 a perspective view of the outer cover as viewed from below;

[0017] Figure 7B for Fig. 7A An exploded view of the outer cover;

[0018] Figure 8 for Fig. 7A A cross-sectional view of the outer cover along line segment 8-8;

[0019] Fig. 9 for Fig. 7A A cross-sectional view of the outer cover along line segment 9-9;

[0020] Fig.10 for Figure 3 An enlarged view of the fan unit;

[0021] Fig.11 for Fig.10 A cross-sectional view of the fan monomer along line segment 11-11;

[0022] Fig.12 for Fig.10 The diameter of the top of the vortex flow channel changes at different positions;

[0023] Fig.13 for Fig.10 A cross-sectional view of a fan unit;

[0024] Fig.14 for Fig.10 The cross-sectional height of the top of the vortex flow passage varies at different positions;

[0025] Fig.15 for Fig.10 The diameter of the top of the vortex flow channel changes at different positions and the cross-sectional height changes.

[0026]

Explanation of symbols

[0027] 100,100a: Ventilation fan

[0028] 110: Shell

[0029] 120: Fan unit

[0030] 121: Motor

[0031] 122: Impeller

[0032] 123: Vortex flow channel

[0033] 124: Top

[0034] 125: Surface

[0035] 126: Plane

[0036] 127: Tongue

[0037] 130, 130a: outer cover

[0038] 131, 131a: Noise reduction structural parts

[0039] 132, 132a: cover

[0040] 133: Buckle

[0041] 134: Flat plate

[0042] 135: Peripheral

[0043] 136: Side wall

[0044] 137: Bottom surface

[0045] 138: Spring

[0046] 139: Card slot

[0047] 140: Air outlet

[0048] 2-2, 8-8, 9-9, 11-11: Line segments

[0049] A,B,C,D,E,F: Area

[0050] CD: diameter

[0051] CS: Cross Section

[0052] d: Circumferential direction

[0053] F1, F2: Airflow

[0054] AB, BC, CD, DE, EF, FA: diameter

[0055] G: Grille

[0056] H1,H2: vertical distance

[0057] H-AB,H-BC,H-CD,H-DE,H-EF,H-FA,H-FO out : Section height

[0058] H-FA: Section height

[0059] L: Horizontal line

[0060] O: Center of circle

[0061] O1, O2: Open

[0062] O in :Air Inlet

[0063] O out :Air outlet

[0064] P: Spacer

[0065] X, Y, Z: axis direction DETAILED DESCRIPTION

[0066] The following disclosed embodiments provide many different embodiments, or examples, for implementing the different features of the provided subject matter. Specific examples of components and arrangements are described below to simplify the present invention. Of course, these examples are only examples and are not intended to be limiting. In addition, the present invention may repeat element symbols and / or letters in each example. This repetition is for the purpose of simplicity and clarity, and does not itself specify the relationship between the various embodiments and / or configurations discussed.

[0067] Spatially relative terms such as "below," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive purposes to describe the relationship of one element or feature to another element or feature as illustrated in the accompanying drawings. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation illustrated in the accompanying drawings. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein should likewise be interpreted accordingly.

[0068] Figure 1 1 is a perspective view of a ventilating fan 100 according to an embodiment of the present disclosure. Figure 2 for Figure 1 A cross-sectional view of the ventilating fan 100 along line 2-2. Figure 1 and Figure 2 The ventilating fan 100 includes a housing 110, a fan unit 120 and an outer cover 130. The outer cover 130 includes a noise reduction structure 131 and a cover body 132. The noise reduction structure 131 has an air inlet O in The cover 132 is disposed on the surrounding portion 135 of the noise reduction structure 131 and covers the air inlet O. in The fan unit 120 includes a motor 121, an impeller 122 and a vortex flow passage 123. The motor 121 and the impeller 122 are located in a space within the fan unit 120. The impeller 122 is connected to the motor 121, and the motor 121 can drive the impeller 122 to rotate to generate an airflow F1.

[0069] In this embodiment, the cover 132 has a spacer column P, and the spacer column P is located on the peripheral portion 135 of the noise reduction structure 131, so that a certain gap is maintained between the cover 132 and the noise reduction structure 131. When the fan unit 120 is running, the airflow F1 can pass through the gap between the cover 132 and the noise reduction structure 131 and the air inlet O of the noise reduction structure 131 in sequence. in The air turns and then enters the vortex flow passage 123. That is, the ventilating fan 100 with the outer cover 130 can achieve lateral air intake.

[0070] Figure 3 for Figure 1 See also Figure 2 and Figure 3 The upper edge of the housing 110 defines an opening O1. The fan unit 120 is located in the housing 110. The outer cover 130 is located at the upper edge of the housing 110 and covers the opening O1. The vortex flow channel 123 of the fan unit 120 surrounds the impeller 122 along the circumferential direction d of the impeller 122 and has an air outlet O1. out When the air flow F1 enters the air inlet at the center of the vortex flow channel 123, it is driven by the impeller 122 and can be discharged from the air outlet O out Exhaust. Air outlet O out The air outlet 140 of the housing 110 is connected to the housing 110 so that the air flow F1 is discharged out of the housing 110 through the air outlet 140 .

[0071] The ventilating fan 100 is installed on the ceiling when used by a consumer. Figure 2 The ventilating fan 100 can be turned 180 degrees and the housing 110 can be buried in the ceiling, so that the cover 132 of the outer cover 130 faces downward. In other words, when the ventilating fan 100 is installed on the ceiling, the positive Z-axis direction points to the ground. The noise reduction structure 131 and the cover 132 of the outer cover 130 can be made of plastic, and the material of the housing 110 can be metal, but it is not limited thereto.

[0072] In the following description, the structure of the outer cover 130 will be described in detail.

[0073] Figure 4A for Figure 3 130 is a perspective view of the outer cover 130 viewed from below. Figure 4B for Figure 4A See also Figure 2 , Figure 4A and Figure 4B , the side wall 136 of the flat plate portion 134 of the noise reduction structural member 131 extends from the peripheral portion 135 in a vertical direction (such as the negative Z-axis direction). The bottom surface 137 of the flat plate portion 134 extends from the side wall 136 in a horizontal direction (such as the positive X-axis direction), and the bottom surface 137 of the flat plate portion 134 is a plane. The flat plate portion 134 is positioned in the housing 110, so that the side wall 136 of the flat plate portion 134 can face the inner side wall of the housing 110. In other words, the bottom surface 137 of the flat plate portion 134 is lower than the upper edge of the housing 110 so that the flat plate portion 134 is located in the housing 110.

[0074] The peripheral portion 135 of the noise reduction structural member 131 has an opening O2. The outer cover 130 also includes a spring member 138. The spring member 138 is connected to the cover body 132 and passes through the opening O2 of the peripheral portion 135. In addition, one end of the spring member 138 away from the cover body 132 can be fixed inside the shell 110 or outside the vortex flow channel 123. The peripheral portion 135 of the noise reduction structural member 131 extends outward from the outer side wall of the shell 110. The outer edge of the cover body 132 is closer to the outside than the outer edge of the peripheral portion 135 of the noise reduction structural member 131. In this embodiment, the top 124 of the vortex flow channel 123 includes a curved surface 125, and there are different and gradual vertical distances between the flat plate portion 134 of the noise reduction structural member 131 and the top 124 of the vortex flow channel 123, for example, the vertical distance H1 is smaller than the vertical distance H2. In other embodiments, the housing 110 may accommodate a vortex flow passage with a flat top, so that the flat plate portion 134 of the noise reduction structure 131 and the top of the vortex flow passage have the same vertical distance.

[0075] Specifically, since the outer cover 130 includes a noise reduction structure 131, and the noise reduction structure 131 has an air inlet O in With the flat plate portion 134, the noise reduction structural member 131 has a rectifying effect before the airflow F1 enters the fan unit 120, so that the airflow F1 is concentrated to form an air column, allowing the airflow F1 to smoothly enter the vortex flow channel 123 of the fan unit 120. The flat plate portion 134 of the noise reduction structural member 131 is equivalent to an additional sound insulation structure, which can reduce the energy of the noise sound wave. The sound wave path difference generated by two resonance spaces is formed between the flat plate portion 134 and the cover body 132 and between the flat plate portion 134 and the bottom of the shell 110. In this way, the airflow F1 can resonate in the resonance space, causing the sound waves to collide repeatedly and diffuse, and the energy is gradually weakened to improve the noise. In addition, since the top 124 of the vortex flow channel 123 of the fan unit 120 includes a curved surface 125, different sound wave path differences can be generated in the vortex flow channel 123, thereby achieving the noise reduction effect of reverse synthesis of sound waves. In addition, since the top 124 of the vortex flow channel 123 has a convex feature, the space inside the flow channel is increased, thereby achieving an effect of increasing the air volume.

[0076] In the following description, other types of outer covers will be described.

[0077] Figure 5 is a cross-sectional view of a ventilating fan 100a according to another embodiment of the present disclosure. Figure 6 for Figure 5 See also Figure 5 and Figure 6 The ventilation fan 100a includes a housing 110, a fan unit 120 and an outer cover 130a. The outer cover 130a includes a noise reduction structure 131a and a cover body 132a. Figure 2The difference between the embodiments is that the cover body 132a of the outer cover 130a has a grille G for the airflow F2 to pass through. Figure 2 The spacer P is used to form a gap between the noise reduction structure 131a. When the fan unit 120 is in operation, the air flow F2 can pass through the grille G of the cover 132a and the air inlet O of the noise reduction structure 131a in sequence. in Without being turned, the air then enters the vortex flow passage 123. That is, the ventilating fan 100a with the outer cover 130a can achieve positive air intake.

[0078] Fig. 7A for Figure 6 A perspective view of the outer cover 130a viewed from below. Figure 7B for Fig. 7A Exploded view of the outer cover 130a. Figure 8 for Fig. 7A A cross-sectional view of the outer cover 130a along line 8-8. Fig. 7A , Figure 7B and Figure 8 In this embodiment, the bottom surface of the cover 132a is lower than the bottom surface of the surrounding portion 135 of the noise reduction structure 131a to prevent the noise reduction structure 131a from being exposed. When the ventilating fan 100a is turned 180 degrees and installed on the ceiling, the cover 132a faces downward and shields the noise reduction structure 131a, the housing 110 and the fan unit 120, which is beneficial to the aesthetic design of the ventilating fan 100a.

[0079] Fig. 9 for Fig. 7A A cross-sectional view of the outer cover 130a along line segment 9-9. Fig. 7A and Fig. 9 The cover 132 further has a buckle 133, and the peripheral portion 135 of the noise reduction structure 131a may have a slot 139. The buckle 133 of the cover 132a may be coupled with the slot 139 of the peripheral portion 135 of the noise reduction structure 131a, thereby positioning the cover 132a on the noise reduction structure 131a.

[0080] It should be understood that the components with the same reference numerals have the same connection relationship, materials and functions, and will not be described in detail. In the following description, the design of the vortex flow channel 123 of the fan unit 120 is further described.

[0081] Fig.10 for Figure 3 The vortex flow channel 123 is a gradually expanding flow channel with a gradually changing diameter and height, and has a out In this embodiment, the diameter and cross-sectional height of the curved surface 125 of the top 124 of the vortex flow channel 123 are from the outlet Oout The area increases along the circumferential direction d to a region (such as region E), and the region is from the center O of the impeller 122 and parallel to the air outlet O out The section CS passes through. Among them, the section CS is Fig.10 The top 124 of the vortex flow channel 123 may include regions A, B, C, D, E, and F in sequence along the circumferential direction d, the cross section CS is located between region E and region F, and the tongue 127 is located between region F and region A. In some embodiments, the top 124 of the vortex flow channel 123 may be circular, approximately circular, or polygonal in top view.

[0082] Fig.11 for Fig.10 A cross-sectional view of the fan unit 120 along line 11-11. Fig.10 and Fig.11 , the horizontal line L is the air outlet O out The top 124 of the vortex flow channel 123 has a diameter where the horizontal line L passes. For example, the top 124 of the vortex flow channel 123 has a diameter FA between the area F and the area A, and a diameter CD between the area C and the area D. Fig.11 As shown, diameter CD is greater than diameter FA. Similarly, diameter AB between regions A and B is greater than diameter FA, diameter BC between regions B and C is greater than diameter AB between regions A and B, and diameter CD between regions C and D is greater than diameter BC between regions B and C.

[0083] Fig.12 for Fig.10 The top 124 of the vortex flow passage 123 changes in diameter at different positions. In this article, "different positions" refers to the top 124 of the vortex flow passage 123 along the Fig.10 In the circumferential direction d. See also Fig.10 and Fig.12 , Fig.12 The horizontal axis represents the position between two adjacent regions along the circumferential direction d, and the vertical axis represents the corresponding diameter. Fig.12 From left to right, the top 124 of the vortex flow channel 123 has a diameter FA between region F and region A, a diameter AB between region A and region B, a diameter BC between region B and region C, a diameter CD between region C and region D, a diameter DE between region D and region E, and a diameter EF between region E and region F. Fig.12It can be seen from the diameter change that the diameter of the top 124 of the vortex flow channel 123 gradually increases from area A along the circumferential direction d to area E, and the diameter of the curved surface 125 of the vortex flow channel 123 between area D and area E and between area E and area F are substantially the same. The maximum diameter of the curved surface 125 of the vortex flow channel 123 is in the area passed by the cross section CS, such as the area between area E and area F.

[0084] Fig.13 for Fig.10 A cross-sectional view of the fan unit 120 is shown. Fig.10 and Fig.13 The top 124 of the vortex flow channel 123 includes a portion near the air outlet O out The plane 126, for example, the plane 126 may be in the partial region F. The top 124 of the vortex flow channel 123 has a cross-sectional height between the horizontal line L. For example, the top 124 of the vortex flow channel 123 has a cross-sectional height H-FA between the region F and the region A, and a cross-sectional height H-CD between the region C and the region D. Fig.13 As shown, the cross-sectional height H-CD is greater than the cross-sectional height H-FA, and the cross-sectional height H-FA approaches zero due to the intersection of the plane 126 of the region F and the curved surface 125 of the region A. Similarly, the cross-sectional height H-AB between the region A and the region B is greater than the cross-sectional height H-FA, the cross-sectional height H-BC between the region B and the region C is greater than the cross-sectional height H-AB between the region A and the region B, and the cross-sectional height H-CD between the region C and the region D is greater than the cross-sectional height H-BC between the region B and the region C.

[0085] Fig.14 for Fig.10 The top 124 of the vortex flow passage 123 has a cross-sectional height variation at different positions. Fig.10 and Fig.14 , Fig.14 The horizontal axis represents the position between two adjacent regions along the circumferential direction d, and the vertical axis represents the corresponding cross-sectional height. Fig.14 From left to right, the top 124 of the vortex flow channel 123 is in the cross-sectional height H-FA between region F and region A, the cross-sectional height H-AB between region A and region B, the cross-sectional height H-BC between region B and region C, the cross-sectional height H-CD between region C and region D, the cross-sectional height H-DE between region D and region E, the cross-sectional height H-EF between region E and region F, and the cross-sectional height H-EF between region F and the air outlet O. out Section height H-FO out .Depend on Fig.14It can be seen from the cross-sectional height that the cross-sectional height of the top 124 of the vortex flow channel 123 gradually increases from area A along the circumferential direction d to area E, and the cross-sectional height of the curved surface 125 of the vortex flow channel 123 between area D and area E and between area E and area F are substantially the same. The maximum cross-sectional height of the curved surface 125 of the vortex flow channel 123 is in the area where the cross section CS passes, such as the area between area E and area F.

[0086] In addition, in this embodiment, the vortex flow passage 123 extends from the area through the cross section CS to the air outlet O. out The top 124 of the curved surface 125 may be a part of the curved surface 125, but the cross-sectional height of the above-mentioned part of the curved surface 125 is the height from the area through which the cross section CS passes (the area between the area E and the area F) along the circumferential direction d to the air outlet O out Decreasing.

[0087] Fig.15 for Fig.10 The diameter change and cross-sectional height change of the top 124 of the vortex flow channel 123 at different positions are as follows: Fig.12 and Fig.14 See also Fig.10 and Fig.15 ,Depend on Fig.15 It can be seen that the diameter and cross-sectional height of the curved surface 125 of the top 124 of the vortex flow channel 123 increase from the starting point of region A along the circumferential direction d to the starting point of region E, and the diameter and cross-sectional height of the curved surface 125 of the top 124 of the vortex flow channel 123 can be maintained the same in region E. The cross-sectional height of the curved surface 125 of the top 124 of the vortex flow channel 123 increases from the starting point of region F (i.e., the area through which the cross section CS passes) to the end point of region F (i.e., adjacent to the air outlet O out In this embodiment, the starting point of region A is the boundary between plane 126 and curved surface 125, so the cross-sectional height gradually increases from zero. The ending point of region F is plane 126 (i.e., outlet O out upper edge), so the section height decreases to zero.

[0088] The foregoing summarizes the features of several embodiments so that those skilled in the art can better understand the embodiments of the present disclosure. Those skilled in the art will appreciate that they can easily use the present disclosure as a basis for designing or modifying other processes and structures to achieve the same purposes and / or achieve the same advantages as the embodiments described herein. Those skilled in the art will also appreciate that such equivalent constructions do not depart from the spirit and scope of the present disclosure, and that they may make various changes, substitutions and modifications herein without departing from the spirit and scope of the present disclosure.

Claims

1. An outer cover, comprising: A noise reduction structural member, comprising an air inlet, a flat plate portion, and a peripheral portion surrounding the flat plate portion, wherein a side wall of the flat plate portion extends vertically from the peripheral portion, a bottom surface of the flat plate portion extends horizontally from the side wall, and the bottom surface of the flat plate portion is a plane; and The cover body is arranged on the peripheral portion and covers the air inlet. The outer cover according to claim 1 , wherein the flat plate portion is configured to be positioned within a housing.

3. The outer cover according to claim 1, wherein the peripheral portion of the noise reduction structure has an opening, and the outer cover further comprises: A spring component is connected to the cover body and passes through the opening of the peripheral portion, and one end of the spring component away from the cover body is configured to be fixed to the shell. 4 . The outer cover according to claim 1 , wherein the cover body has a spacer column, and the spacer column is located on the peripheral portion of the noise reduction structure so that there is a gap between the cover body and the noise reduction structure. 5 . The outer cover according to claim 1 , wherein an outer edge of the cover body is located outside an outer edge of the peripheral portion of the noise reduction structure. 6 . The outer cover according to claim 1 , wherein the peripheral portion of the noise reduction structural member has a slot, the cover body has a buckle, and the buckle is coupled to the slot. The outer cover according to claim 1 , wherein a bottom surface of the cover body is lower than a bottom surface of the peripheral portion.

8. A fan unit, comprising: motor; an impeller connected to the motor; as well as A vortex flow channel surrounds the impeller along the circumferential direction of the impeller and has an air outlet, wherein the top of the vortex flow channel includes a curved surface, the diameter and cross-sectional height of the curved surface increase from the air outlet along the circumferential direction to a region, and the region passes through a cross section passing through the center of the impeller and parallel to the air outlet. 9 . The fan unit according to claim 8 , wherein a cross-sectional height of the curved surface decreases from the region along the circumferential direction to the air outlet. 10 . The fan unit according to claim 8 , wherein the scroll flow passage has a tongue portion close to the air outlet, and the top portion of the scroll flow passage includes a plane close to the air outlet. 11 . The fan unit according to claim 8 , wherein a maximum diameter of the curved surface of the scroll flow passage is at the region. 12 . The fan unit according to claim 8 , wherein a maximum cross-sectional height of the curved surface of the scroll flow passage is located in the region. 13 . The fan unit according to claim 8 , wherein the vortex flow passage from the region to the top of the air outlet is a part of the curved surface.

14. A ventilating fan, comprising: a shell, the upper edge of which surrounds the opening; The fan unit is located in the housing and includes: motor; an impeller connected to the motor; and a vortex flow channel, surrounding the impeller along the circumferential direction of the impeller and having an air outlet, wherein the top of the vortex flow channel comprises a curved surface, the diameter and cross-sectional height of the curved surface increase from the air outlet along the circumferential direction to a region, and the region is passed by a cross section passing through the center of the impeller and parallel to the air outlet; and An outer cover, located at the upper edge of the shell and covering the opening, the outer cover comprising: A noise reduction structural member, comprising an air inlet, a flat plate portion, and a peripheral portion surrounding the flat plate portion, wherein a side wall of the flat plate portion extends vertically from the peripheral portion, a bottom surface of the flat plate portion extends horizontally from the side wall, and the bottom surface of the flat plate portion is a plane; and The cover body is arranged on the peripheral portion and covers the air inlet. 15 . The ventilating fan according to claim 14 , wherein the bottom surface of the flat plate portion is lower than the upper edge of the housing so that the flat plate portion is located inside the housing.

16. The ventilating fan according to claim 14, wherein the peripheral portion of the noise reduction structural member has an opening, and the outer cover further comprises: A spring element is connected to the cover body and fixed to the housing through the opening of the peripheral portion. 17 . The ventilating fan according to claim 14 , wherein the peripheral portion of the noise reduction structural member extends outwardly from an outer side wall of the housing. 18 . The ventilating fan according to claim 14 , wherein the side wall of the flat plate portion of the noise reduction structure faces an inner side wall of the housing.

19. The ventilating fan according to claim 14, wherein the flat plate portion of the noise reduction structure has different vertical distances from the top of the scroll flow passage. 20 . The ventilating fan according to claim 14 , wherein a cross-sectional height of the curved surface decreases from the region along the circumferential direction to the air outlet.

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