Low-noise hair drier

Abstract

The utility model relates to the technical field of blowers, in particular to a low-noise blower which comprises a shell and a fan, the shell comprises an air inlet, an air outlet and an air duct communicating the air inlet with the air outlet, the fan is arranged in the air duct, and an air gathering section and an air duct middle section communicating the air gathering section with the air outlet are arranged on the side, located at the air outlet end of the fan, of the air duct. At least part of the inner wall of the air gathering section inclines from the air inlet end of the air gathering section to the center axis of the air channel in the flowing direction of airflow in the air channel so as to guide airflow at the air outlet end of the fan to gather towards the middle section of the air channel. The air flow occupies the middle space near the central axis of the air duct, the situation that the middle air flow speed of the air duct is inconsistent with the peripheral air flow speed is avoided, part of peripheral high-speed air flow is prevented from entering the middle space to form turbulent flow, noise caused by middle air oscillation is eliminated, and the flow speed loss of the high-speed air flow is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of hair dryers, and in particular to a low-noise hair dryer. Background Art

[0002] High-speed hair dryers are not only efficient in drying hair, but also have lower noise than traditional hair dryers. However, there is still room for improvement in noise reduction. High-speed hair dryers use high-speed motors, which derive spiral high-speed airflow from the fan flow channel through the action of fan blades. Therefore, at the outlet end of the high-speed motor, the high-speed airflow flows forward in the outer area of ​​the air duct corresponding to the fan blades, and the middle space near the central axis of the air duct is surrounded by the high-speed airflow. This causes the airflow velocity in the outer area and the middle area of ​​the air duct to be inconsistent in the radial direction, and a low-pressure area is formed in the middle area of ​​the air duct, so that part of the high-speed airflow in the outer area enters the middle area of ​​the air duct to form turbulence, causing the air in the middle to vibrate, thereby generating noise, and at the same time causing the loss of high-speed airflow, reducing the flow rate of high-speed airflow. Summary of the invention

[0003] The present application makes improvements to the problems existing in the above-mentioned prior art, that is, the purpose of the present application is to provide a low-noise hair dryer, comprising a shell and a fan, the shell comprising an air inlet, an air outlet and an air duct connecting the air inlet and the air outlet, the fan is arranged in the air duct, the air duct is located on the side of the air outlet end of the fan and is provided with an air gathering section and a middle section of the air duct connecting the air gathering section and the air outlet, at least a part of the inner wall of the air gathering section is inclined from the air inlet end of the air gathering section along the flow direction of the air flow in the air duct toward the central axis of the air duct, so as to guide the airflow at the air outlet end of the fan to converge to the middle section of the air duct.

[0004] In one embodiment, the cross-sectional area of ​​the wind-collecting section perpendicular to the central axis of the air duct is larger than the cross-sectional area of ​​the middle section of the air duct perpendicular to the central axis of the air duct.

[0005] In one embodiment, the inclined inner walls inclined on any two sides of the wind gathering section are symmetrically arranged on both sides of the central axis of the air duct.

[0006] In one embodiment, among the inclined inner walls of the wind focusing section, the inclination degree of at least one side of the inclined inner walls is smaller than the inclination degree of at least one side of the remaining inclined inner walls.

[0007] In one embodiment, the inner wall surface of the air-collecting section is arranged in a concave-convex structure along the flow direction of the airflow in the air duct.

[0008] In one embodiment, the inner wall surface of the wind-collecting section is in a wave shape with multiple arc surfaces connected along the flow direction of the airflow in the air duct.

[0009] In one embodiment, the inner wall surface of the air-collecting section is in an S-shaped curve shape along the airflow direction in the air duct, with an inner concave arc surface connected to an outer convex arc surface.

[0010] In one embodiment, the angle between the inclined inner wall of the wind focusing section and the central axis of the fan is less than 45°.

[0011] In one embodiment, an air guide plate is provided at the air outlet of the shell, a silencer cavity is formed between the outer peripheral wall of the air guide plate and the shell, and a silencer hole communicating with the silencer cavity is provided at the periphery of the air guide plate.

[0012] In one embodiment, the inner wall of the peripheral edge of the air guide plate is inclined from the outer periphery along the flow direction of the airflow in the air duct toward the central axis of the air duct.

[0013] Beneficial effects:

[0014] 1) In the present application, the air-gathering section guides the airflow at the air outlet of the fan to converge to the middle section of the air duct, so that the airflow occupies the middle space near the central axis of the air duct, thereby avoiding the situation where the air flow velocity in the middle of the air duct is inconsistent with the air flow velocity in the periphery, avoiding part of the high-speed airflow in the periphery from entering the middle space to form turbulence, eliminating the noise caused by the air vibration in the middle and reducing the velocity loss of the high-speed airflow.

[0015] 2) In one embodiment, the cross-sectional area of ​​the air-gathering section perpendicular to the central axis of the air duct is larger than the cross-sectional area of ​​the middle section of the air duct perpendicular to the central axis of the air duct. After the airflow is gathered to the middle section of the air duct, the airflow itself gathers in an area with a smaller cross-sectional area and continues to move forward. The airflow velocity can be further improved, so that the air outlet performance of the hair dryer is further improved.

[0016] 3) In one embodiment, the inclined inner walls inclined on any two sides of the wind focusing section are symmetrically arranged on both sides of the central axis of the air duct, and the inclined inner walls on each side of the wind focusing section have substantially the same effect on guiding the airflow, and the flow velocity of the airflow flowing along the inclined inner walls on each side into the middle section of the air duct is substantially the same, thereby reducing the generation of turbulence in the middle section of the air duct to reduce noise.

[0017] 4) In one embodiment, among the inclined inner walls of the wind focusing section, the inclination degree of at least one side of the inclined inner walls is smaller than the inclination degree of at least one side of the remaining inclined inner walls, so as to achieve a balance between the radial narrowing degree of the middle section of the air duct and the avoidance of the middle section of the air duct for other components.

[0018] 5) In one embodiment, the inner wall surface of the wind focusing section is arranged in a concave-convex structure along the flow direction of the airflow in the air duct, thereby increasing the contact area between the inclined inner wall of the wind focusing section and the airflow, reducing the airflow flow and pressure per unit area of ​​the inclined inner wall, and thus reducing the noise generated by the airflow hitting the inclined inner wall.

[0019] 6) In one embodiment, the inner wall surface of the wind gathering section is wavy in shape with multiple arc surfaces connected along the direction of airflow in the air duct, and the multiple arc surfaces of the wavy structure are relatively smooth, with less obstruction to the airflow flow, thereby reducing the loss of airflow velocity. Therefore, it is possible to increase the surface area of ​​the inner wall of the wind gathering section while reducing its weakening effect on the airflow velocity.

[0020] 7) In one embodiment, the inner wall surface of the wind-collecting section is in the shape of an S-shaped curve along the flow direction of the airflow in the air duct, with an inner concave arc surface connected to an outer convex arc surface. The airflow guidance process is relatively gentle, and the Coanda effect is utilized to produce a wall attachment effect, thereby reducing the loss of airflow velocity and reducing noise.

[0021] 8) In one embodiment, the angle between the inclined inner wall of the wind focusing section and the central axis of the fan is less than 45°, which reduces the blocking effect of the inclined inner wall on the airflow and improves its guiding effect on the airflow, reduces the intensity of the airflow hitting the inclined inner wall, reduces the generation of turbulence to reduce noise, and reduces the loss of airflow velocity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the embodiments of the present application, the drawings required for use in the embodiments of the present application are briefly introduced below.

[0023] Figure 1 A cross-sectional view of a low-noise hair dryer of the present application;

[0024] Figure 2 is a three-dimensional cross-sectional view of a low-noise hair dryer;

[0025] Figure 3 A schematic diagram of an embodiment of an inclined inner wall of an air duct air gathering section;

[0026] Figure 4 A schematic diagram of an embodiment of an inclined inner wall of an air duct air gathering section;

[0027] Figure 5 is a three-dimensional schematic diagram of an air guide plate;

[0028] Figure 6 is a cross-sectional view of the air guide plate;

[0029] Figure 7 is a schematic diagram of an annular flange, a magnetic attraction ring and a silencer cavity;

[0030] Figure numerals: 1. shell, 11. air inlet, 12. air outlet, 13. annular flange, 2. fan, 21. fan flow channel, 3. middle section of air duct, 30. wind gathering section, 31. inclined inner wall, 4. button module, 5. air guide plate, 51. silencer hole, 52. peripheral inner wall, 53. peripheral outer wall, 54. air guide port, 6. silencer cavity, 61. partition rib, 7. magnetic ring, 8. silencer assembly. DETAILED DESCRIPTION

[0031] The following specific embodiments are merely explanations of the present application and are not limitations of the present application. After reading this specification, those skilled in the art may make modifications to the embodiments without any creative contribution as needed. However, as long as they are within the scope of the claims of the present application, they are protected by the patent law.

[0032] The present application provides a low-noise hair dryer 2, comprising a shell 1 and a fan 2, the shell 1 comprising an air inlet 11, an air outlet 12 and an air duct connecting the air inlet 11 and the air outlet 12, the fan 2 is arranged in the air duct, when the fan 2 is running, the air enters the shell 1 from the air inlet 11 and flows in the air duct, and is finally discharged from the air outlet 12 of the shell 1, wherein the airflow in the air duct reaches the air outlet end of the fan 2 after passing through the fan 2, and the airflow is discharged from the fan flow channel 21 under the action of the fan blades of the fan 2, forming a spiral high-speed airflow close to the inner wall of the air duct, the airflow is mainly located in the outer radial area of ​​the air duct, and the middle area of ​​the air duct near the central axis of the air duct is surrounded by the airflow. The air duct described in the present application is provided with a gathering section 30 and a middle section 3 of the air duct connecting the gathering section 30 and the air outlet 12 on one side of the air outlet end of the fan 2. At least part of the inner wall of the gathering section 30 is inclined from the air inlet end of the gathering section 30 along the air flow direction in the air duct toward the central axis of the air duct, forming an inclined inner wall 31 of the gathering section 30 to guide the airflow at the air outlet end of the fan 2 to converge to the middle section 3 of the air duct. The inclined inner wall 31 of the gathering section 30 reduces the space of the air duct located at the air outlet end of the fan 2, forcing the airflow to converge to the middle section 3 of the air duct and continue to flow. In the middle section 3 of the air duct, the airflow occupies the middle space near the central axis of the air duct, thereby avoiding the situation where the air velocity in the middle of the air duct and the peripheral air velocity are inconsistent, avoiding part of the peripheral high-speed airflow from entering the middle space to form turbulence, eliminating the noise caused by the air vibration in the middle and reducing the velocity loss of the high-speed airflow. After the air gathering section 30 guides the airflow to the middle section of the air duct, the airflow can occupy the middle space of the middle section 3 of the air duct. In the process of guiding the airflow by the air gathering section 30, part of the middle space near the central axis of the air gathering section 30 is still not occupied by the airflow, and part of the peripheral airflow still enters the middle space to form turbulence. However, the inclined inner wall 31 of the air gathering section 30 reduces the space of the air gathering section 30, and the airflow gradually converges to the middle, so that the middle space not occupied by the airflow in the air gathering section 30 is smaller, thereby reducing the generation of noise in the air gathering section 30 and the loss of airflow velocity. At the same time, the air gathering section 30 guides the airflow through its inclined inner wall 31. After encountering the obstruction of the inclined inner wall 31, the airflow will turn to flow along the inclined inner wall 31. The guiding process is relatively smooth, which can reduce the intensity of the airflow hitting the inclined inner wall 31, so as to reduce the airflow loss and the turbulence caused by the hitting, thereby reducing both the noise and the flow velocity loss.

[0033] In the present application, the airflow is guided to the middle section 3 of the air duct by the air gathering section 30, so that the airflow entering the middle section 3 of the air duct occupies the middle space near its own central axis in the middle section 3 of the air duct, so as to eliminate the space surrounded by the airflow in the middle section 3 of the air duct, thereby reducing noise. In one embodiment, the cross-sectional area of ​​the air gathering section 30 perpendicular to the central axis of the air duct is larger than the cross-sectional area of ​​the middle section 3 of the air duct perpendicular to the central axis of the air duct, so that the radial dimension of the middle section 3 of the air duct is smaller than the radial dimension of the air gathering section 30, so that the space in the middle section 3 of the air duct is occupied by the airflow, eliminating the air oscillation space near the central axis of the middle section 3 of the air duct to reduce noise, and after the airflow is gathered to the middle section 3 of the air duct, the airflow gathers in an area with a smaller cross-sectional area and continues to move, and the airflow velocity can be further improved, so that the air outlet performance of the hair dryer is further improved.

[0034] The air duct in the present application includes an air gathering section 30 and an air duct middle section 3. The air gathering section 30 guides the airflow to converge to the air duct middle section 3. The cross-sectional area of ​​the air duct changes from the air gathering section 30 to the air duct middle section 3. The central axis of the air duct middle section 3 may deviate from the position of the initial air duct central axis. The air gathering section 30 is the part of the air duct where the cross-sectional area begins to change. Therefore, it is considered that the central axis of the air gathering section 30 remains consistent with the central axis of the air duct, that is, the initial central axis of the air duct, while the central axis of the air duct middle section 3 may be coaxial with or non-coaxial with the central axis of the air duct. In one embodiment, the inclined inner walls 31 arranged obliquely on any two sides of the air gathering section 30 are symmetrically arranged on both sides of the central axis of the air duct, that is, for the inclined inner walls 31 on any two sides, there is a plane passing through the central axis of the air duct, so that the inclined inner walls 31 on any two sides are symmetrical about the plane. Therefore, even if the distance between the inclined inner walls 31 on any two sides in the circumferential direction of the air gathering section 30 is very close, in this embodiment, it can be considered that the inclined inner walls 31 on any two sides are symmetrically arranged on both sides of the central axis of the air duct; therefore, in this embodiment, when there are inclined inner walls 31 on two sides, the two are symmetrically arranged on both sides of the central axis of the air duct, and the inclination degree and length of the two are consistent. When there are three or more inclined inner walls 31 on the When the inclined inner walls 31 are provided on three or more sides, the inclined inner walls 31 on any two sides of the inclined inner walls 31 are symmetrically arranged on both sides of the central axis of the air duct, and the inclination degree and length of the inclined inner walls 31 on any two sides are consistent. Generally speaking, the inclined inner walls 31 on three or more sides are arranged around the central axis of the air duct; therefore, in this embodiment, the central axis of the middle section 3 of the air duct connected from the air outlet end of the air focusing section 30 is coaxial with the central axis of the air duct, and the guiding effect of the inclined inner walls 31 on each side of the air focusing section 30 on the airflow is substantially consistent, and the flow velocity of the airflow flowing along the inclined inner walls 31 on each side and entering the middle section 3 of the air duct is substantially consistent, thereby reducing the generation of turbulence in the middle section 3 of the air duct to reduce noise.In another embodiment, among the inclined inner walls 31 of the wind gathering section 30, the inclination degree of at least one side of the inclined inner walls 31 is smaller than the inclination degree of at least one side of the remaining inclined inner walls 31, so that the center of the air outlet end of the wind gathering section 30 is eccentric with the central axis of the air duct, so that the central axis of the middle section 3 of the air duct connected to the air outlet end of the wind gathering section 30 is not coaxial with the central axis of the air duct; this embodiment mainly considers the radial narrowing degree of the middle section 3 of the air duct and the avoidance of the middle section 3 of the air duct for other components, and the middle section 3 of the air duct is The inclined inner wall 31 of the wind gathering section 30 is extended from the air outlet end thereof to gradually narrow the cross-sectional area of ​​the wind duct to the middle section 3 of the wind duct, so that the airflow can occupy the middle space near the central axis of the middle section 3 of the wind duct after entering the middle section 3 of the wind duct to eliminate the turbulent space. Therefore, the inclined inner wall 31 of the wind gathering section 30 is arranged to narrow the middle section 3 of the wind duct in the radial direction to enable the airflow to completely occupy the internal space, and at the same time, the outer space of the middle section 3 of the wind duct becomes the avoidance space of the wind duct, and a space can be set in the avoidance space. The remaining components are arranged. For example, when the middle section 3 of the air duct is located on the handle included in the shell, the avoidance space can be extended into by the button module 4; the avoidance space corresponds to the inclined inner wall 31 of the air collecting section 30 along the central axis of the air duct, so under the premise that the length of the inclined inner wall 31 of the air collecting section 30 is certain, its inclination determines the width of the avoidance space along the radial direction of the air duct. In this embodiment, the inclination of the inclined inner wall 31 on at least one side is smaller than the inclination of the remaining inclined inner walls 31 on at least one side. In specific implementation, the inclination of the corresponding inclined inner wall 31 on one side can be adjusted according to the width of the button module 4 extending into the handle, so that the avoidance space corresponding to the inclined inner wall 31 on this side is sufficient to accommodate the extended part of the button module 4, and then the inclination of the inclined inner walls 31 on the remaining sides is adjusted, so that the radial size of the air outlet end of the final air collecting section 30 meets the narrowing degree requirement for the cross-sectional area size of the middle section 3 of the air duct, and finally achieves the consideration of the radial narrowing degree of the middle section 3 of the air duct and the avoidance of the middle section 3 of the air duct for the remaining components.

[0035] In the present application, at least part of the inner wall of the air focusing section 30 is inclined from the air inlet end of the air focusing section 30 along the flow direction of the air flow in the air duct toward the central axis of the air duct, forming an inclined inner wall 31 of the air focusing section 30. The inclined inner wall 31 is generally inclined to guide the airflow toward the middle section 3 of the air duct and determine the overall guiding direction of the airflow. The surface shape of the inclined inner wall 31 determines the local guiding effect and affects the overall guiding effect. In one embodiment, the inner wall surface of the air gathering section 30 is arranged in a concave-convex structure along the flow direction of the airflow in the air duct to increase the surface area of ​​the inner wall of the air gathering section 30. The inner wall of the air gathering section 30 includes an inclined inner wall 31 arranged obliquely from the air inlet end of the air gathering section 30 along the flow direction of the airflow in the air duct toward the central axis of the air duct, thereby increasing the contact area between the inclined inner wall 31 of the air gathering section 30 and the airflow. When the flow rate and pressure of the airflow at the air outlet end of the fan 2 are determined, the airflow flow rate and pressure per unit area of ​​the inclined inner wall 31 are reduced, thereby reducing the noise generated by the airflow hitting the surface of the inclined inner wall 31. However, the concave-convex structure of the inner wall of the air gathering section 30 may cause a certain loss in the airflow velocity.

[0036] Therefore, further improvements are made. In one embodiment, the inner wall surface of the wind gathering section 30 is wavy with multiple arc surfaces connected along the flow direction of the airflow in the air duct, so that the concave-convex structure of the inner wall surface of the wind gathering section 30 is wavy. The wavy structure includes multiple connected arc surfaces, which increases the contact area with the airflow, and the arc surface of the wavy structure is relatively smooth, thereby reducing the obstruction to the flow of airflow and reducing the loss of the airflow velocity. Therefore, it is possible to reduce the weakening effect on the airflow velocity while increasing the surface area of ​​the inner wall of the wind gathering section 30. In this embodiment, the wavy structure of the inner wall surface of the wind gathering section 30 includes multiple connected arc surfaces, which specifically include two implementation methods, one is that multiple convex arc surfaces are connected in sequence, and the other is that multiple convex arc surfaces and multiple concave arc surfaces are staggered and connected, wherein the latter also has a certain Coanda effect for guiding the airflow, and the guiding effect is better.

[0037] In another embodiment, the inner wall surface of the air gathering section is in an S-shaped curve with an inner concave arc surface connected to an outer convex arc surface along the flow direction of the airflow in the air duct. The inner wall of the air gathering section 30 includes an inclined inner wall 31 which is inclined from the air inlet end of the air gathering section 30 toward the central axis of the air duct along the flow direction of the airflow in the air duct; the inner concave arc surface is concave inward relative to the inclined inner wall 31, and is located near one end of the fan 2, which expands part of the space for the air outlet end of the fan 2, so the airflow discharged from the fan flow channel 21 first enters the space vacated by the inner concave arc surface, and then moves along the inner concave arc surface to gradually turn, so that the airflow gradually moves toward the central axis of the air duct; the outer convex arc The surface protrudes outward relative to the inclined inner wall 31 and is located at the end away from the fan 2. It is connected to the inner concave arc surface, roughly forming an S-shaped curve. When the airflow completes the path of the inner concave arc surface, it continues to move along the outer convex arc surface. At this time, the airflow is guided by the outer convex arc surface to turn in the opposite direction, so that the direction of the airflow gradually changes from pointing to the central axis of the air duct back to pointing away from the fan 2. When the airflow completes the outer convex arc surface, the airflow has reached the middle section 3 of the air duct and the direction is roughly consistent with the subsequent flow direction. In this embodiment, the S-shaped curved surface of the inclined inner wall 31 is formed by the inner concave arc surface and the outer convex arc surface connected in sequence. Although the process of the airflow flowing along the inclined inner wall 31 of the wind gathering section 30 in this embodiment is accompanied by the change of flow direction, the guiding process is relatively gentle; when the airflow discharged from the fan flow channel 21 enters the space vacated by the inner concave arc surface, the inner concave arc surface does not directly block the airflow with strong pressure, but first allows most of the airflow to easily enter the space vacated by the inner concave arc surface, so that the flow direction of the airflow is first tangent to the inner concave arc surface, and then the inner concave arc surface is used to gently guide the airflow to move and gradually turn, so that most of the airflow can always move along the inner concave arc surface. , effectively reducing the intensity of the airflow hitting the wall, the loss of airflow and the generation of turbulence, thereby reducing the noise and the loss of airflow velocity; and when the airflow travels to the junction of the inner concave arc surface and the outer convex arc surface, the Coanda effect is used to produce a wall attachment effect, so that the airflow continues to travel along the outer convex arc surface and turns in the opposite direction. The guiding process is also relatively gentle, and when the airflow completes the path of the outer convex arc surface, it not only reaches the middle section 3 of the air duct, but its flow direction is also roughly consistent with the subsequent travel direction, which can reduce the local turbulence caused by the interweaving and mixing of multiple airflows traveling along different inclined inner walls 31 when converging to the middle section 3 of the air duct, thereby further reducing the noise and the loss of airflow velocity. Furthermore, this embodiment is further improved, and the concave arc surface of the inner wall of the wind collecting section 30 is preferably tangent to the convex arc surface, the end of the concave arc surface away from the convex arc surface is tangent to the inner wall of the flow channel of the fan 2, and the end of the convex arc surface away from the concave arc surface is tangent to the inner wall of the middle section 3 of the air duct, thereby further improving the softness of the inner wall of the wind collecting section 30 in guiding the airflow and further reducing the loss of noise and airflow velocity.

[0038] In one embodiment, the cross-sectional area of ​​the air concentrating section 30 gradually decreases from the air inlet end of the air concentrating section 30 along the air flow direction in the air duct, and the change in the cross-sectional area of ​​the air concentrating section 30 along the air flow direction in the air duct is mainly determined by the change in the shape of the inclined inner wall along the air flow direction in the air duct; the cross-sectional area of ​​the air concentrating section 30 gradually decreases from the air inlet end of the air concentrating section 30 along the air flow direction in the air duct, that is, the inclined inner wall 31 of the air concentrating section 30 continues to extend toward the central axis of the air duct from the air inlet end of the air concentrating section 30 along the air flow direction in the air duct, and there is no local portion extending away from the central axis of the air duct, so that the airflow always moves toward the central axis of the air duct during the process of flowing along the inclined inner wall 31 of the air concentrating section 30, thereby improving the smoothness of the airflow guidance, reducing the loss of airflow velocity, and reducing noise at the same time. Specifically, in one embodiment, the inner wall surface of the air collecting section 30 is straight along the air flow direction in the air duct, and the inner wall of the air collecting section 30 includes an inclined inner wall 31 which is inclined from the air inlet end of the air collecting section 30 along the air flow direction in the air duct toward the central axis of the air duct. The surface of the inclined inner wall 31 is straight, so that the cross-sectional area of ​​the air collecting section 30 is uniformly reduced, thereby improving the smoothness of the air flow guidance, thereby reducing the loss of air flow velocity.

[0039] The shell 1 of the present application includes a body and a handle. Usually, a button module 4 for operation is also provided on the handle. The button module 4 has a certain volume, and part of it extends outside the handle and part of it extends into the handle. The part that extends deep into the handle will occupy part of the outer space in the air duct, causing obstruction to the airflow. When the airflow hits these button modules 4, it will cause airflow loss and turbulence. Both the hitting process and the turbulence will generate noise. The loss of airflow will cause a loss of airflow velocity, so it is necessary to avoid the button module 4 from obstructing the airflow as much as possible. In one embodiment, a button module 4 is provided on the handle, and the button module 4 at least partially extends into the handle, and the button module 4 is within the projection range of the inclined inner wall 31 of the wind collecting section 30 along the axial direction of the fan 2, and the axial direction of the fan is consistent with the flow direction of the airflow in the air duct, so in the direction of the airflow, the part of the button module 4 extending into the shell 1 is completely blocked by the inclined inner wall 31 of the wind collecting section 30, avoiding the button module 4 extending into the air duct to cause obstruction to the airflow, and after the airflow is guided by the inclined inner wall 31, its travel path avoids the button module 4, avoiding the button module 4 from causing obstruction to the airflow, thereby avoiding the loss of airflow velocity and reducing noise.

[0040] There is an angle between the inclined inner wall 31 of the wind gathering section 30 and the central axis of the fan 2. The greater the inclination of the inclined inner wall 31, the larger the angle with the central axis of the fan 2, and the better the effect of reducing the partial turbulent space near the central axis of the wind gathering section; but the function of the inclined inner wall 31 is to smoothly guide the airflow to converge to the middle section 3 of the air duct. It forces the airflow to turn by obliquely blocking the airflow. The blocking process will inevitably bring about the loss of airflow velocity and the generation of turbulence. The greater the inclination of the inclined inner wall 31, the greater the blocking effect on the airflow, and the weaker the guiding effect, the more violent the airflow hits the inclined inner wall 31, the more the airflow velocity is lost and the turbulence is generated, and the greater the noise. Therefore, although an excessively large inclination of the inclined inner wall 31 can effectively reduce the middle turbulent space near the central axis of the wind gathering section 30, it will cause excessive loss of airflow, which will not only cause a large loss of airflow velocity, but also cause a large amount of turbulence to be squeezed in the sufficiently reduced wind gathering section 30, thereby increasing noise and the load on the fan 2. Therefore, it is necessary to take into account both the reduction of the turbulent space in the middle of the wind gathering section 30 by the inclined inner wall 31 and the blocking and guiding effects of the inclined inner wall 31 on the airflow. Therefore, in one embodiment, the angle between the inclined inner wall 31 of the wind gathering section 30 and the central axis of the fan 2 is less than 45°, which reduces the blocking effect of the inclined inner wall 31 on the airflow and improves its guiding effect on the airflow, reduces the intensity of the airflow hitting the inclined inner wall 31, reduces the generation of turbulence to reduce noise, and reduces the loss of airflow velocity, so that most of the airflow can smoothly converge toward the middle section 3 of the air duct along the inclined inner wall 31, avoids the airflow compression of the wind gathering section 30 and causes excessive load on the fan, and at the same time, the velocity component of the airflow along the inclined inner wall 31 is larger, which reduces the velocity loss of the airflow to increase the flow rate. For embodiments in which the inclined inner wall surface of the wind gathering section 30 is in different shapes, the angle between the inclined inner wall 31 and the central axis of the air duct includes the angle between the line connecting the end point of the inclined inner wall 31 close to the fan and the end point away from the fan along the flow direction of the airflow in the air duct and the central axis of the air duct.

[0041] The airflow is gathered by the wind gathering section 30 to the middle section 3 of the air duct and then continues to move forward, and is finally discharged from the air outlet 12 of the shell 1 through the air guide plate 5. The air guide plate 5 is provided with an air guide port 54 for discharging the airflow. The existing product improves the air outlet effect of the high-speed hair dryer 2 and improves the user experience through the design of the air guide port 54. For the airflow that has already traveled to the air outlet 12 of the shell 1 in the air duct, only the part of the airflow that directly corresponds to the air guide port 54 can be discharged directly, and the remaining part of the airflow that does not directly correspond to the air guide port 54 will first hit the inner wall of the air guide plate 5, and then be discharged after changing direction to the air guide port 54. The hitting process and the turbulence generated after the hitting will generate noise. The wind guide plate 5 of the existing high-speed hair dryer 2 is arranged at the air outlet 12 of the shell 1. Usually, the periphery of the wind guide plate 5 is related to the installation, and the air guide port 54 will not be arranged at the periphery of the wind guide plate 5. The airflow often fills the entire air duct, so it is inevitable that part of the airflow will first hit the inner wall 52 of the periphery of the wind guide plate 5 to be turned, and then move to the air guide port 54 until it is discharged. Therefore, in one embodiment, the wind guide plate 5 is provided at the air outlet 12 of the shell 1, and the outer wall 53 of the periphery of the wind guide plate 5 and the shell 1 form a silencer chamber 6. The periphery of the wind guide plate 5 is provided with a silencer hole 51 connected to the silencer chamber 6. When part of the airflow moves toward the inner wall 52 of the periphery of the wind guide plate 5, most of this part of the airflow will enter the silencer chamber 6 through the silencer hole 51. The silencer chamber 6 is sealed except for the silencer hole 51. After entering the silencer chamber 6, the airflow will be reflected in the silencer chamber 6 for consumption, and converted into heat energy, etc. The noise sound waves in the silencer chamber 6 will disappear, and the noise sound waves in the silencer chamber 6 will experience multiple reflections and refractions, causing interference of the sound waves, dispersing the energy of the sound waves, thereby reducing the noise. Since part of the airflow in the air duct is still continuously entering the silencer chamber 6, it is difficult for the airflow to escape in the opposite direction through the silencer hole 51 as long as it enters the silencer chamber 6; although this process will cause the loss of part of the airflow, it can effectively reduce the airflow hitting the inner wall 52 of the periphery of the air guide plate 5, which can reduce both the noise generated by the striking process and the noise caused by the turbulence generated by the striking. In the present application, the air guide plate 5 is located at the air outlet 12 of the housing 1. In some embodiments, the air guide plate 5 is integrated on the air guide cover and is located at the end of the air guide cover close to the air outlet 12 of the housing 1.

[0042] Regarding the formation of the silencer chamber 6, in one embodiment, the air outlet 12 of the housing 1 is provided with an annular flange 13 extending from the periphery to the center, the outer wall 53 of the periphery of the air guide plate 5 is inclined from the periphery along the flow direction of the airflow in the air duct toward the central axis of the air duct, the air guide plate 5 abuts against the annular flange 13 to form the silencer chamber 6, or the air guide plate 5 abuts against the magnetic ring 7 provided at the annular flange 13 to form the silencer chamber 6. The outer wall 53 of the periphery of the air guide plate 5 and the annular flange 13 extend in different directions, and there is an angle between the two, so as long as the air guide plate 5 abuts against the annular flange 13, the silencer chamber 6 can be formed between the outer wall 53 of the periphery of the air guide plate 5, the annular flange 13 and the inner wall of the housing 1, the structure is simple, and when the airflow entering the silencer chamber 6 hits the annular flange 13 and reflects back, it will hit the inclined outer wall 53 of the periphery of the air guide plate 5, thereby reducing the severity of the hit and reducing the noise. In one implementation of the present embodiment, the extension length of the annular flange 13 is sufficient to cover the peripheral outer wall 53 of the air guide plate 5, and the air guide plate 5 abuts against the annular flange 13 to form a silencer chamber 6 surrounded by the peripheral outer wall 53 of the air guide plate 5, the annular flange 13 and the shell 1. In another implementation of the present embodiment, considering that the high-speed hair dryer 2 is usually also equipped with a nozzle, the nozzle needs to be detachably connected to the air outlet 12 of the shell 1. In the previous implementation of the present embodiment, the nozzle needs to be detachably connected through a structural snap-on design, etc., which is inconvenient. Currently, a magnetic attraction method is commonly used to achieve detachable connection between the nozzle and the air outlet 12 of the shell 1. Therefore, in the present embodiment, an annular magnetic ring 7 is provided at the annular flange 13, and the outer edge of the magnetic ring 7 is abutted and sealed with the annular flange 13, and the inner edge of the magnetic ring 7 is abutted and sealed with the outer wall 53 of the peripheral edge of the air guide plate 5. The annular flange 13 and the magnetic ring 7 jointly close one side of the silencer chamber 6, and the magnetic ring 7 blocks the airflow toward the side of the silencer chamber 6, and the magnetic ring 7 is exposed away from the side of the silencer chamber 6 to achieve magnetic fixation with the nozzle. The magnetic ring 7 can be magnetic or non-magnetic, as long as one of the magnetic ring 7 and the nozzle is magnetic and the other has a metal material that can be magnetically attracted.

[0043] In the airflow corresponding to the peripheral inner wall 52 of the air guide plate 5 in the air duct, part of it enters the silencer chamber 6 through the silencer hole 51, while part of it will still hit the peripheral inner wall 52 of the air guide plate 5 and move toward the air guide port 54. Therefore, in one embodiment, the peripheral inner wall 52 of the air guide plate 5 is preferably inclined from the periphery along the flow direction of the airflow in the air duct toward the central axis of the air duct. In this way, not only can the peripheral inner wall 52 of the air guide plate 5 guide the airflow, so that the airflow hitting the peripheral inner wall 52 of the air guide plate 5 can move along the peripheral inner wall 52 of the air guide plate 5 toward the air guide port 54, so that this part of the airflow is accelerated to enter the air guide port 54, thereby increasing the wind speed, but also the airflow velocity loss and turbulence caused by the airflow hitting the peripheral inner wall 52 of the air guide plate 5 can be reduced, thereby increasing the wind speed and reducing the noise.

[0044] The airflow is only discharged from the air guide port 54 on the air guide plate 5 to achieve high-speed blowing. In the embodiment of the present application in which the silencer chamber 6 is formed between the peripheral outer wall 53 of the air guide plate 5 and the shell 1, part of the airflow will also enter the silencer chamber 6 through the silencer hole 51. Once the silencer chamber 6 has a poor sealing problem in other parts except the silencer hole 51, the airflow will be discharged outward, resulting in pressure relief, which will not only cause the silencer chamber 6 to fail, but also seriously affect the high-speed blowing performance of the hair dryer 2. The silencer chamber 6 is surrounded by the air guide plate 5 and the shell 1, which is a weak link. If the hair dryer 2 is accidentally dropped by the user, this part is prone to loosening, causing air leakage and pressure relief. Therefore, in one embodiment, a plurality of partition ribs 61 are provided in the circumferential direction of the silencer chamber 6 to divide the silencer chamber 6 into a plurality of independent parts. In this way, even if air leakage occurs due to local looseness, it only occurs in the local area of ​​the silencer chamber 6, and the remaining independent areas of the silencer chamber 6 will not be affected, thereby controlling the two negative effects of silencer failure and pressure relief and air leakage within the small range of the local area of ​​the silencer chamber 6, avoiding silencer failure and pressure relief and air leakage in the entire silencer chamber 6, and fully reducing the adverse effects on the noise reduction effect and high-speed blowing performance of the high-speed hair dryer 2.

[0045] The shell 1 is usually required to have equal wall thickness during manufacturing to ensure the structural performance of the shell 1. Since the inclined inner wall 31 of the wind-collecting section 30 is inclined from the end close to the fan 2 toward the center of the air duct, the outer wall of the wind-collecting section 30 also needs to be in the same inclined state as the inner wall, so that the wind-collecting section 30 has equal wall thickness. This will cause the shell 1 to be concave inward at the corresponding inclined outer wall of the wind-collecting section 30, which is a structurally weak area. Therefore, in one embodiment, the outer wall of the shell 1 corresponding to the inclined inner wall 31 of the wind-collecting section 30 is inclined from the end close to the fan 2 toward the central axis of the air duct, and the inclined outer wall of the shell 1 is provided with reinforcing ribs to strengthen the structural strength of the outer wall of the shell 1 corresponding to the wind-collecting section 30. The extension direction of the reinforcing ribs is preferably consistent with the axial direction of the fan 2, and the supporting effect is better. In one embodiment, the shell 1 is an inner shell, and an outer shell is also provided outside the inner shell to cover the inclined outer wall and reinforcing ribs on the inner shell to improve the appearance. The housing 1 of the present application includes a handle and a wind tube, and the fan 2 can be arranged in the handle or in the wind tube.

[0046] Furthermore, in one embodiment, the muffler hole 51 at the air outlet 12 of the shell 1 and the muffler cavity 6 use the Helmholtz resonance principle to muffle the sound. Specifically, the depth and size of the muffler hole 51 and the volume of the muffler cavity 6 are adjusted to affect the propagation path and speed of the sound wave, and change the phase and amplitude of the sound wave. When the natural frequency of the muffler cavity 6 matches the frequency of the external sound source, the resonance effect is excited, and the energy of the sound wave is absorbed and dissipated, thereby improving the muffler effect. Further, in one embodiment, a muffler component 8 is provided at the air inlet end of the fan 2. The muffler component 8 includes an annular bracket and a sound-absorbing material arranged on the periphery of the annular bracket. The annular bracket is provided with a sound-absorbing hole. The sound wave enters the sound-absorbing material through the sound-absorbing hole and is absorbed. The space formed between the annular bracket and the inner wall of the shell 1 cooperates with the sound-absorbing hole to muffle the sound using the Helmholtz resonance principle, thereby improving the noise reduction effect.

[0047] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A low-noise hair dryer, comprising a housing and a blower, wherein the housing comprises an air inlet, an air outlet and an air duct connecting the air inlet and the air outlet, and the blower is arranged in the air duct, characterized in that: The air duct is provided with an air gathering section and a middle section of the air duct connecting the air gathering section and the air outlet on one side of the air outlet end of the fan. At least a portion of the inner wall of the air gathering section is inclined from the air inlet end of the air gathering section along the air flow direction in the air duct toward the central axis of the air duct to guide the airflow at the air outlet end of the fan to converge toward the middle section of the air duct.

2. A low noise hair dryer according to claim 1, characterized in that: The cross-sectional area of ​​the wind-collecting section perpendicular to the central axis of the air duct is greater than the cross-sectional area of ​​the middle section of the air duct perpendicular to the central axis of the air duct.

3. A low noise hair dryer according to claim 1, characterized in that: The inclined inner walls inclinedly arranged on any two sides of the wind gathering section are symmetrically arranged on both sides of the central axis of the air duct.

4. A low noise hair dryer according to claim 1, characterized in that: Among the inclined inner walls of the wind gathering section that are inclined, the inclination degree of at least one side of the inclined inner walls is smaller than the inclination degree of at least one side of the remaining inclined inner walls.

5. A low noise hair dryer according to claim 1, characterized in that: The inner wall surface of the wind gathering section is arranged in a concave-convex structure along the flow direction of the airflow in the air duct.

6. A low noise hair dryer according to claim 5, characterized in that: The inner wall surface of the wind gathering section is in a wave shape with multiple arc surfaces connected along the flow direction of the airflow in the air duct.

7. A low noise hair dryer according to claim 5, characterized in that: The inner wall surface of the wind gathering section is in an S-shaped curve shape along the flow direction of the airflow in the air duct, with an inner concave arc surface connected to an outer convex arc surface.

8. A low noise hair dryer according to claim 1, characterized in that: The angle between the inclined inner wall of the wind gathering section and the central axis of the fan is less than 45°.

9. A low noise hair dryer according to claim 1, characterized in that: An air guide plate is provided at the air outlet of the shell, a silencer cavity is formed between the outer wall of the periphery of the air guide plate and the shell, and a silencer hole communicating with the silencer cavity is provided at the periphery of the air guide plate.

10. A low noise hair dryer according to claim 9, characterized in that: The inner wall of the peripheral edge of the air guide plate is inclined from the outer periphery along the flow direction of the air flow in the air duct toward the central axis of the air duct.

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