A hand-held fan with lateral air intake

Abstract

The utility model discloses a handheld fan of lateral air intake. A handheld fan of lateral air intake, including handle and the fan casing of connecting at handle, be equipped with fan assembly in the fan casing, the fan assembly includes motor and impeller, the axial one end of casing is the air intake end, and the axial other end is the air outlet end, the fan casing is equipped with a plurality of lateral air intake area at the circumference of being close to the air intake end, and the lateral air intake area extends along the peripheral direction of casing, the impeller includes a plurality of fan blade, and the fan blade has coincident area in radial direction with lateral air intake area. The utility model has the advantages of effectively increasing the air intake area, thereby improving the air intake and the air outlet amount.

Description

Technical Field

[0001] This utility model belongs to the field of fan technology, and in particular relates to a handheld fan that can draw air from the side. Background Technology

[0002] With the increasing miniaturization of everyday electronic products, the requirements for the size and portability of fans are also becoming more stringent. Existing handheld fans typically have an air inlet on the rear of the casing and an air outlet on the front, allowing for smooth airflow from back to front.

[0003] However, with the miniaturization of handheld fans, the area of ​​the rear air intake also decreases, resulting in reduced airflow and poor airflow. Increasing the speed to compensate for this would increase operating noise. Therefore, how to improve the airflow of a handheld fan within its limited space is an urgent problem to be solved. Utility Model Content

[0004] To address the shortcomings of existing technologies, a handheld fan with side air intake is provided.

[0005] This utility model is achieved using the following technical solution: a handheld fan with lateral air intake, comprising a handle and a fan housing connected to the handle, wherein a fan assembly is provided inside the fan housing, the fan assembly comprising a motor and an impeller; one axial end of the housing is an air intake end, and the other axial end is an air outlet end; the fan housing has a plurality of lateral air intake areas near the periphery of the air intake end, the lateral air intake areas extending along the circumferential direction of the housing; the impeller comprises a plurality of fan blades, the fan blades and the lateral air intake areas having overlapping areas in the radial direction.

[0006] By setting a lateral air intake area extending circumferentially around the air intake end of the fan housing, the air intake surface is expanded from the traditional end face axial air intake to side wall lateral air intake, which effectively increases the air intake area, thereby increasing the air intake and exhaust volume, while also eliminating the need for a rotation speed and resulting in lower noise.

[0007] By arranging the lateral air intake area near the periphery of the air intake end and making the fan blades and the lateral air intake area overlap radially, the structure is more compact, while allowing the lateral airflow to be directly captured and pressurized by the outer edge of the fan blades.

[0008] Preferably, the impeller further includes a blade holder located at the center, and the fan blades are fixed on the blade holder;

[0009] The fan blade extends axially from the blade frame toward the air inlet end, and the position of the fan blade in the axial direction extends beyond the end face of the blade frame facing the air inlet end.

[0010] By setting the fan blades to extend axially towards the air inlet and beyond the blade frame, the lateral airflow can be directly captured by the fan blades after entering the cylinder without having to go through a long detour, thus shortening the airflow path.

[0011] Preferably, the blade frame includes a straight section and a guide section, the guide section being close to the air inlet end, and the diameter of the guide section gradually increasing along the air outlet direction; the lateral air inlet area only overlaps with the guide section in the radial direction.

[0012] With the above configuration, the lateral airflow is perpendicular to the axis. The guide section provides a smooth ramp. When the airflow hits this ramp, it is redirected and flows along the conical surface towards the outlet. This prevents the airflow from erratically moving within the casing, organizes the disordered lateral airflow into an ordered axial airflow, and reduces flow losses.

[0013] Preferably, the housing includes an outer shell and an inner cylinder, the outer shell is sleeved and fixed to the outside of the inner cylinder, and the lateral air intake area includes a first air intake on the inner cylinder and a second air intake on the outer shell, wherein the opening area of ​​the second air intake is smaller than the opening area of ​​the first air intake.

[0014] A filter screen is held between the outer shell and the inner cylinder. The area of ​​the filter screen is larger than the opening area of ​​the first air inlet and larger than the opening area of ​​the second air inlet.

[0015] Preferably, the second air inlet has a converging guide slope extending from its opening edge.

[0016] The above settings facilitate airflow guidance during lateral air intake.

[0017] Preferably, the inner cylinder has an outwardly protruding frame edge integrally formed around the periphery of the first air inlet. The frame edge abuts against the outer periphery of the filter screen to circumferentially limit the filter screen.

[0018] Preferably, the air inlet end cover of the fan housing is provided with an air inlet grille, which is fixedly connected to the fan housing; the end face of the air inlet grille abuts against the side of the filter screen to axially limit the filter screen.

[0019] The above configuration allows for a more compact structure, with the lateral air intake area compressed to the end closest to the air intake, resulting in a high degree of axial integration of the air intake grille, filter, and fan assembly. This also shortens the axial dimension of the fan housing, facilitating product miniaturization and portability.

[0020] Preferably, the inner cylinder also has a plurality of spaced abutting protrusions integrally formed around the periphery of the first air inlet, the abutting protrusions rising outward from the outer surface of the inner cylinder;

[0021] The filter screen is attached to the abutting protrusion, and an air intake gap is maintained between the abutting protrusion and the fan housing.

[0022] If the filter screen fits snugly against the inner cylinder, some airflow will directly impact the periphery of the first air inlet, generating noise. This solution creates a buffer chamber by setting an air intake gap, allowing the airflow to transition through a gap area after passing through the filter screen, thereby reducing noise.

[0023] Preferably, there are two sets of lateral air intake areas, which are symmetrically distributed on opposite sides of the fan assembly along the axial centerline of the fan housing.

[0024] By setting up two sets of symmetrical lateral air intake areas, the total air intake area is increased, improving air intake efficiency. On the other hand, the airflow can be evenly drawn in from the opposite sides of the fan assembly, effectively avoiding airflow imbalance and uneven radial force on the impeller caused by unilateral air intake, and reducing operating vibration and noise.

[0025] Preferably, the fan housing is rotatably connected to the handle via a rotating connection to achieve adjustment of the air outlet angle;

[0026] The rotating connection part is located at the lower end of the fan housing, and the two lateral air intake areas are located on the left and right sides of the fan housing respectively;

[0027] The rotation axis of the rotating connection extends in the left-right direction, so that when the fan housing is tilted relative to the handle, the handle always avoids the lateral air intake area.

[0028] Compared with the prior art, the beneficial effects of this utility model are: by setting a lateral air intake area extending circumferentially around the air intake end of the fan housing, the air intake surface is expanded from the traditional end face axial air intake to side wall lateral air intake, which effectively increases the air intake area, thereby increasing the air intake volume and air output volume, while also eliminating the need to provide a rotation speed and reducing noise.

[0029] By arranging the lateral air intake area near the periphery of the air intake end and making the fan blades and the lateral air intake area overlap radially, the structure is more compact, while allowing the lateral airflow to be directly captured and pressurized by the outer edge of the fan blades. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the fan structure;

[0031] Figure 2 A structural schematic diagram of the fan from another perspective;

[0032] Figure 3This is an exploded view of the fan assembly.

[0033] Figure 4 This is a vertical sectional view of the fan assembly;

[0034] Figure 5 This is a cross-sectional view of the fan assembly;

[0035] Figure 6 A schematic diagram of the fan assembly after removing the outer casing;

[0036] Figure 7 for Figure 6 A schematic diagram of the structure after removing the filter screen;

[0037] Figure 8 for Figure 5 A magnified view of the circled area.

[0038] Reference numerals: 1. Fan housing; 11. Inner cylinder; 12. Outer shell; 121. Air inlet grille; 13. Air outlet; 14. Air inlet; 2. Handle; 3. Side air inlet area; 31. First air inlet; 32. Second air inlet; 321. Guide slope; 4. Filter screen; 5. Frame protrusion; 51. Abutting protrusion; 6. Impeller; 61. Blade frame; 62. Fan blade; 621. Straight section; 622. Guide section; 7. Rotating connection part. Detailed Implementation

[0039] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0040] Reference Figures 1 to 7 A handheld fan with side-intake capability includes a handle 2 and a fan housing 1. The fan housing 1 is rotatably connected to the handle 2 via a rotating connection 7 located at the lower end of the fan housing 1, with its rotation axis extending in the left-right direction, allowing the fan housing 1 to be tilted relative to the handle 2. Specifically, the rotatable connection between the rotating connection 7 and the handle 2 can be achieved using an existing damping shaft, allowing the fan housing 1 to rotate to the user's desired tilt angle.

[0041] like Figure 3 and Figure 4 As shown, the fan housing 1 includes an outer shell 12 and an inner cylinder 11. The inner cylinder 11 serves as the core frame supporting the fan assembly, with one axial end being the air inlet 14 and the other end being the air outlet 13. The outer shell 12 is fitted onto and fixed to the outside of the inner cylinder 11, forming a sandwich space between them. Specifically, in this embodiment, the outer shell 12 and the inner cylinder 11 are fastened using existing snap-fit ​​methods, or they can be fixed using screws, glue, or other methods.

[0042] like Figures 1 to 7As shown, two sets of lateral air intake regions 3 are provided on the periphery of the fan housing 1 near the air inlet end 14. The two sets of lateral air intake regions 3 are symmetrically distributed on opposite sides of the fan assembly along the axial center line, specifically distributed on the left and right sides of the fan housing 1, and are arc-shaped extending in the circumferential direction of the fan housing 1. Specifically, the lateral air intake region 3 includes a first air inlet 31 located on the inner cylinder 11 and a second air inlet 32 ​​located on the outer shell 12. The opening area of ​​the second air inlet 32 ​​is smaller than the opening area of ​​the first air inlet 31, and a converging guide slope 321 extends from the opening edge of the second air inlet 32 ​​(specifically as shown in the figure). Figure 5 and Figure 8 As shown, the second air inlet 32 ​​has a size that gradually decreases from the outside to the inside near its outer opening, in order to pre-accelerate and guide the incoming airflow.

[0043] like Figures 3 to 5 and Figure 8 As shown, the fan assembly is located inside the inner cylinder 11 and includes a motor (not shown) and an impeller 6. The impeller 6 includes a centrally located blade frame 61 and multiple fan blades 62. To maximize the capture of lateral airflow, the fan blades 62 extend axially from the blade frame 61 toward the air inlet end 14, and the position of the fan blades 62 in the axial direction extends beyond the end face of the blade frame 61 toward the air inlet end 14 (i.e., forward-extending fan blade design); the fan blades 62 and the lateral air inlet area 3 have an overlapping area in the radial direction.

[0044] The blade carrier 61 includes an integrally formed straight section 621 and a guide section 622, with the guide section 622 located near the air inlet end 14. Specifically, the diameter of the guide section 622 gradually increases along the air outlet direction and eventually smoothly connects with the straight section 621, serving to smoothly guide the lateral airflow axially. The lateral air inlet region 3 only overlaps with the guide section 622 in the radial direction. This guide section 622 not only provides a mounting base for the fan blade 62 but also smoothly guides the laterally inflowing airflow to the air outlet end 13.

[0045] like Figures 4 to 7 As shown, a filter screen 4 is sandwiched between the outer shell 12 and the inner cylinder 11. The area of ​​the filter screen 4 is larger than the opening area of ​​the first air inlet 31 and the second air inlet 32 ​​to ensure full-coverage filtration. The inner cylinder 11 has several spaced-apart abutment protrusions 51 integrally formed around the periphery of the first air inlet 31. The filter screen 4 is attached to the abutment protrusions 51, thus maintaining an air intake gap between the outer wall of the inner cylinder 11 and the filter screen 4. Simultaneously, the inner cylinder 11 also has an outwardly protruding frame edge 5, which abuts against the outer periphery of the filter screen 4, circumferentially limiting the filter screen 4.

[0046] like Figure 6 and Figure 7As shown, the air inlet end 14 of the fan housing 1 is covered with an air inlet grille 121. The air inlet grille 121 is fixedly connected to the fan housing 1, and its end face abuts against the side of the filter screen 4 to axially limit the filter screen 4.

[0047] Working principle:

[0048] During use, the motor drives the impeller 6 to rotate at high speed. External airflow mainly enters the interlayer space through the second air inlet 32 ​​on the outer casing 12 and is filtered through the filter screen 4. As the filter screen 4 is lifted by the abutment protrusion 51, the airflow is buffered and stabilized in the air intake gap, and then enters the interior of the inner cylinder 11 through the first air inlet 31 on the inner cylinder 11. Thanks to the forward-protruding design of the fan blade 62 and its radial overlap with the side air intake area 3, the airflow is directly captured and pressurized by the outer edge of the fan blade 62, and finally blown out from the air outlet 13. During this process, since the rotating connection part 7 is located at the lower end and the side air intake area 3 is located on the left and right sides, the handle 2 and the user's palm will not block the air intake no matter how the fan casing 1 is tilted.

Claims

1. A handheld fan with side-intake capability, comprising a handle and a fan housing connected to the handle, wherein a fan assembly is disposed within the fan housing, the fan assembly comprising a motor and an impeller; characterized in that: One axial end of the housing is the air inlet end, and the other axial end is the air outlet end. The fan housing has several lateral air inlet areas near the periphery of the air inlet end, and the lateral air inlet areas extend along the circumferential direction of the housing. The impeller includes multiple fan blades, and the fan blades and the lateral air inlet areas have overlapping areas in the radial direction. The impeller also includes a blade frame located at the center, and the fan blades are fixed on the blade frame; the fan blades extend axially from the blade frame toward the air inlet end, and the position of the fan blades in the axial direction extends beyond the end face of the blade frame facing the air inlet end; The blade frame includes a straight section and a guide section. The guide section is close to the air inlet end, and the diameter of the guide section gradually increases along the air outlet direction. The lateral air inlet area only overlaps with the guide section in the radial direction.

2. The handheld fan with lateral air intake according to claim 1, characterized in that: The housing includes an outer shell and an inner cylinder. The outer shell is fitted and fixed to the outside of the inner cylinder. The lateral air intake area includes a first air inlet on the inner cylinder and a second air inlet on the outer shell. The opening area of ​​the second air inlet is smaller than the opening area of ​​the first air inlet. A filter screen is held between the outer shell and the inner cylinder. The area of ​​the filter screen is larger than the opening area of ​​the first air inlet and larger than the opening area of ​​the second air inlet.

3. The handheld fan with lateral air intake according to claim 2, characterized in that: The second air inlet has a converging guide slope extending from its opening edge.

4. The handheld fan with lateral air intake according to claim 2, characterized in that: The inner cylinder has an outwardly protruding frame edge integrally formed around the periphery of the first air inlet. The frame edge abuts against the outer periphery of the filter screen to circumferentially limit the filter screen.

5. The handheld fan with lateral air intake according to claim 4, characterized in that: The air inlet end cover of the fan housing is provided with an air inlet grille, which is fixedly connected to the fan housing; the end face of the air inlet grille abuts against the side of the filter screen to axially limit the filter screen.

6. The handheld fan with lateral air intake according to claim 2, characterized in that: The inner cylinder also has a plurality of spaced abutting protrusions integrally formed around the periphery of the first air inlet, the abutting protrusions rising outward from the outer surface of the inner cylinder; The filter screen is attached to the abutting protrusion, and an air intake gap is maintained between the abutting protrusion and the fan housing.

7. The handheld fan with lateral air intake according to claim 1, characterized in that: The number of lateral air intake areas is two sets, and the two sets of lateral air intake areas are symmetrically distributed on opposite sides of the fan assembly along the axial center line of the fan housing.

8. The handheld fan with lateral air intake according to claim 7, characterized in that: The fan housing is rotatably connected to the handle via a rotating connection to allow for adjustment of the airflow angle; The rotating connection part is located at the lower end of the fan housing, and the two lateral air intake areas are located on the left and right sides of the fan housing respectively; The rotation axis of the rotating connection extends in the left-right direction, so that when the fan housing is tilted relative to the handle, the handle always avoids the lateral air intake area.

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