Low-noise blower and low-noise heat dryer

Abstract

The invention relates to the technical field of blowers, in particular to a low-noise blower and a low-noise drying machine. The low-noise blower comprises a shell provided with a first air inlet; the inner shell is arranged in the outer shell, the outer shell is in closed connection with the rear end of the inner shell, an air outlet is formed in the rear end of the inner shell, and a flow collecting air inlet is formed in the front end of the inner shell; an air outlet channel is formed between the flow collecting air inlet and the air outlet through the inner wall of the inner shell, and a driving component is arranged in the air outlet channel. A first air inlet channel is formed between the first air inlet and the flow collecting air inlet through an interlayer space between the inner wall of the outer shell and the outer wall of the inner shell, and the first air inlet channel surrounds the driving component. The front end face of the flow collecting air inlet is of a wave-shaped structure. The first air inlet channel wraps the driving component through the double-layer shell structure, noise of turbulent flow gas in the driving component is isolated through laminar flow gas, the end face of the flow collecting air inlet is arranged to be of a wave structure, airflow entering the driving component is combed, and turbulent flow noise generated by airflow steering is reduced.

Description

Technical Field

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

[0002] Hair dryers are small household appliances that are used frequently in people's daily lives. Hair dryers are mainly used for drying and shaping hair. Hair dryers blow out high-speed airflow, which inevitably produces noise. Loud noise not only makes users feel irritated, but also affects the sleep of their family members.

[0003] In addition, when blowing the air of a pet, the high noise can easily cause the pet to have a stress response, making it impossible to blow dry the pet. In the existing technology, drying products for pets usually abandon a certain amount of wind power to reduce the noise as much as possible. However, the pet's hair is large and dense, which requires a very long drying time. Abandoning part of the wind power will further extend the drying time.

[0004] Therefore, two hair dryers with the same wind power can be distinguished as high-end products and low-end products, or even different categories, based on the noise level. Therefore, taking into account both wind power and low noise is the common pursuit of the hair dryer industry, and low-noise hair dryers have a broader market. Summary of the invention

[0005] In order to solve the above-mentioned prior art problems, the present invention provides a low-noise hair dryer, comprising: a housing provided with a first air inlet;

[0006] An inner shell is arranged inside the outer shell, a sandwich space is provided between the outer shell and the inner shell, the outer shell and the inner shell are closed and connected at the rear ends, the sandwich space stops at the closed connection position, the rear end of the inner shell forms an air outlet, and the front end of the inner shell forms a collecting air inlet;

[0007] An air outlet passage is formed between the collecting air inlet and the air outlet through an inner cavity surrounded by the inner wall of the inner shell, and a driving component is arranged in the air outlet passage;

[0008] Wherein, a first air inlet channel is formed between the first air inlet and the collecting air inlet through the interlayer space formed by the inner wall of the outer shell and the outer wall of the inner shell, and the first air inlet channel surrounds the driving component;

[0009] Wherein, the front end surface of the collecting air inlet is a wave-shaped structure.

[0010] Furthermore, a second air inlet is provided at the front end of the housing, and the front end of the collecting air inlet faces the second air inlet;

[0011] Wherein, a second air inlet passage is formed between the second air inlet and the collecting air inlet through the inner wall surface of the shell.

[0012] Furthermore, the inner and outer edges of the wavy structure are both provided with rounded corners; the inner edge of the wavy structure is the edge close to the center of the collecting air inlet; and the outer edge of the wavy structure is the edge away from the center of the collecting air inlet.

[0013] Furthermore, the curvature radius of the convexity at the top of the wavy structure is smaller than the curvature radius of the concaveity at the bottom of the wavy structure, and the curvature radius of the concaveity at the bottom of the wavy structure is greater than 4 mm;

[0014] The vertical distance between the top protrusion of the wavy structure and the bottom depression of the wavy structure is L1; 6mm>L1>4mm.

[0015] Furthermore, the air inlet area of ​​the first air inlet is S1; the air inlet area of ​​the second air inlet is S2;

[0016] 3*S1>S2>2*S1.

[0017] Furthermore, the shell is in the form of a pipe and is bent into two sections of the same length, and the two ends of the shell are located in the same plane, the first air inlet is located at the bent position; the second air inlet and the air outlet are respectively located at the two ends of the shell;

[0018] Wherein, the bending angle of the shell is 60°.

[0019] Furthermore, it also includes a switch button to switch between normal mode and pet mode;

[0020] In the pet mode, the driving component sets the air outlet temperature to less than 50°C.

[0021] Furthermore, it also includes a sound-generating module, which emits pet sounds after switching to the pet mode.

[0022] Furthermore, the air outlet is a narrow slit structure, and the air outlet area is S3;

[0023] 3*S3>S1+S2>2*S3.

[0024] Further, a low-noise heat dryer, based on the above content, the air outlet area of ​​the air outlet is S3;

[0025] S3>S1+S2.

[0026] The beneficial effects of the present invention are reflected in that a low-noise hair dryer / hot dryer provided by the present invention uses a double-shell structure to allow the first air inlet channel to wrap around the driving component, isolates the noise of turbulent gas in the driving component through laminar gas, and sets the end face of the collecting air inlet to a wave structure, so as to comb and disperse the airflow entering the driving component and reduce the turbulent noise generated by the airflow turning. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A cross-sectional view of a low-noise hair dryer provided by the present invention;

[0028] Figure 2 A three-dimensional diagram of a low-noise hair dryer provided by the present invention;

[0029] Figure 3 A three-dimensional diagram of the internal structure of a low-noise hair dryer provided by the present invention;

[0030] Figure 4 A schematic diagram of the internal airflow direction of a low-noise hair dryer;

[0031] Figure 5 A three-dimensional diagram of the internal structure of a low-noise heat drying machine provided by the present invention;

[0032] Figure 6 This is a schematic diagram of a three-dimensional structure of another form of a low-noise hair dryer in Example 1;

[0033] Figure 7 for Figure 6 Cross-sectional view of a medium-low noise hair dryer.

[0034] Figure numerals: 1. outer shell; 11. first air inlet; 111. first air inlet channel; 12. second air inlet; 121. second air inlet channel; 2. inner shell; 21. collecting air inlet; 211. wave-shaped structure; 22. air outlet; 221. air outlet channel; 3. driving component; 4. switching button; 5. conical airflow. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1

[0037] Reference Figure 1 - Figure 4 , Figure 6 - Figure 7 .

[0038] A low-noise hair dryer, comprising: a housing 1 provided with a first air inlet 11;

[0039] An inner shell 2 is arranged in the outer shell 1, and a sandwich space is provided between the outer shell 1 and the inner shell 2. The outer shell 1 and the inner shell 2 are closed and connected at the rear ends, and the sandwich space ends at the closed connection position. The rear end of the inner shell 2 forms an air outlet 22, and the front end of the inner shell 2 forms a collecting air inlet 21;

[0040] An inner cavity surrounded by the inner wall of the inner shell 2 forms an air outlet channel 221 between the collecting air inlet 21 and the air outlet 22, and a driving component 3 is disposed in the air outlet channel 221;

[0041] Wherein, a first air inlet channel 111 is formed between the first air inlet 11 and the collecting air inlet 21 through the interlayer space formed by the inner wall of the outer shell 1 and the outer wall of the inner shell 2, and the first air inlet channel 111 surrounds the driving component 3;

[0042] The front end surface of the collecting air inlet 21 is a wave-shaped structure 211 .

[0043] The driving component 3 is a fan and includes a corresponding heating component;

[0044] There is a sandwich space between the outer shell 1 and the inner shell 2, and the rear ends of the outer shell 1 and the inner shell 2 are closed and connected, which means that the outer shell 1 is sleeved outside the inner shell 2, and there is a gap between the inner shell 2 and the outer shell 1, and the gap space is the sandwich space, and the outer wall of the inner shell 2 and the inner wall of the outer shell 1 are blocked to form a closed connection. The sandwich space is naturally limited to one side of the closed connection, that is, before the rear ends of the inner shell 2 and the outer shell 1.

[0045] For a hair dryer, the noise mainly comes from the turbulence caused by hitting the blades when entering the driving component 3 and hitting the inner wall of the pipe when leaving the driving component 3. Turbulence refers to the irregular and chaotic flow state of the fluid, the interlaced streamlines and the vortex phenomenon. In the turbulent state, the speed and direction of the airflow change dramatically, the sound waves generated are also more complex, and the sound is noisier and sharper. When the airflow is in the pipe, the package with the pipe can easily maintain a laminar state.

[0046] Taking advantage of this, the present application provides an inner shell 2 and an outer shell 1, wherein the outer shell 1 is provided with a first air inlet 11, and the front end of the inner shell 2 is provided with a collecting air inlet 21 and the rear end is provided with an air outlet 22. An air outlet channel 221 is formed between the collecting air inlet 21 and the air outlet 22, and a driving component 3 is provided in the air outlet channel 221. A first air inlet channel 111 is formed between the first air inlet 11 and the collecting air inlet 21 through the interlayer between the outer shell 1 and the inner shell 2, and the first air inlet channel 111 surrounds the driving component 3. The laminar air in the first air inlet channel 111 isolates the airflow from the blades of the driving component 3 and the noise generated by the turbulent flow when leaving the driving component 3. The mechanism of action includes at least: the noise transmission path passes through multiple medium layers such as solid, gas, and solid, and each medium surface has a strong noise energy weakening effect; and the dynamic airflow with a lower flow rate in the air inlet channel has a better sound wave energy absorption effect, and the overall low noise effect is obvious.

[0047] However, the first air inlet channel 111 will go through a turn when connected to the collecting air inlet 21. During the turning process, turbulence will still be generated, and the turning angle position is located at the edge of the first air inlet channel 111, and there is almost no laminar gas wrapped in the first air inlet channel 111. Therefore, a large noise will be generated here and it cannot be isolated and reduced.

[0048] In this regard, in the present application, the front end of the collecting air inlet 21 is set as a wavy structure 211. Normally, in the end plane of the pipeline, the diameter of the first air inlet channel 111 is larger than the diameter of the air outlet channel 221. This causes the airflow to squeeze each other when passing through the first air inlet channel 111 and entering the air outlet channel 221, making it difficult for the airflow to smoothly return to a laminar state. The present application provides a wavy structure 211. The wavy structure 211 is characterized in that it has a top protrusion and a bottom depression. The top protrusion is farther from the collecting air inlet 21, and the bottom depression is closer to the collecting air inlet 21. Therefore, the airflow around the collecting air inlet 21 enters the collecting air inlet 21 first near the bottom depression of the wavy structure 211, and the airflow near the top protrusion of the wavy structure 211 enters the collecting air inlet 21 last. The wavy structure 211 has a combing effect on the airflow, and the airflow is divided into multiple layers along the axial direction of the collecting air inlet 21. Each layer of airflow is not a complete circular ring, but is divided into multiple segments of circular rings. Therefore, the airflow can diffuse freely in the area where the circular ring is disconnected without being squeezed, thereby ensuring that the airflow no longer generates turbulence due to squeezing and collision, and ultimately produces a noise reduction effect.

[0049] Another feature of the wave-shaped structure 211 is that the top protrusion and the bottom depression are smoothly transitioned through a curve, so there are no sharp corners, which effectively avoids the airflow generated by the corner tearing the airflow.

[0050] Furthermore, both the inner and outer edges of the wavy structure 211 are provided with rounded corners; the inner edge of the wavy structure 211 is the edge close to the center of the collecting air inlet 21; the outer edge of the wavy structure 211 is the edge away from the center of the collecting air inlet 21. The inner and outer edges of the wavy structure 211 are provided with rounded corners, so that the airflow can pass through the wavy structure 211 more smoothly, and the wavy structure 211 is prevented from tearing the airflow.

[0051] Example 2

[0052] Reference Figure 1 - Figure 4 .

[0053] The front end of the housing 1 is provided with a second air inlet 12, and the front end of the collecting air inlet 21 faces the second air inlet 12;

[0054] A second air inlet channel 121 is formed between the second air inlet 12 and the collecting air inlet 21 through the inner wall surface of the housing 1 .

[0055] The first air inlet channel 111 is composed of the outer wall of the inner shell 2 and the inner wall of the outer shell 1. At the same time, the inner diameter of the inner shell 2 determines the air volume. Therefore, if you want to meet the blowing effect of a normal hair dryer, the inner diameter of the inner shell 2 needs to be determined first. If you want to expand the air inlet area of ​​the first air inlet channel 111, you can only do so by expanding the diameter of the outer shell 1. The outer shell 1 determines the external volume of the hair dryer. Obviously, the volume of the hair dryer cannot be expanded infinitely. The hair dryer is swung with one hand, and users obviously will not consider using a bulky and heavy hair dryer. Therefore, it is difficult to increase the air inlet area of ​​the first air inlet channel 111. If you want to increase the air volume, you can only increase the power of the driving component 3. Increasing the power of the driving component 3 means increasing the air flow velocity. The faster the air flow velocity, the greater the noise generated, which will conflict with the fundamental purpose of noise reduction in this application.

[0056] In response to the above problem, in this embodiment, a second air inlet 12 is arranged at the front end of the shell 1, and the second air inlet 12 is arranged in front of the collecting air inlet 21. A second air inlet channel 121 is formed between the second air inlet 12 and the collecting air inlet 21 through the inner wall surface of the shell 1, that is, the second air inlet channel 121 is a straight channel, and the airflow can directly enter the collecting air inlet 21 along a straight line. The inner diameter of the shell 1 determines the air inlet area of ​​the second air inlet channel 121, which is much larger than the area of ​​the first air inlet channel 111. Therefore, in this embodiment, the second air inlet channel 121 can be used as the main air inlet channel to provide sufficient air; the first air inlet channel 111 is used as an auxiliary air inlet channel, which only provides part of the air and mainly plays a role in noise reduction.

[0057] At the same time, the airflow passing through the first air inlet channel 111 will be retracted when entering the collecting air inlet 21 to form a Figure 4 The conical airflow 5 shown in the figure, the airflow of the conical structure can gather and guide the straight airflow (the airflow in the second channel is named as the straight airflow) to prevent the straight airflow from colliding with the end face of the collecting air inlet 21 when flowing to the driving component 3. At the same time, the fan blade area in the driving component 3 is annular, and components such as the motor and the heating component are arranged in the middle. Therefore, the airflow will not pass through the center of the driving component 3, and the airflow needs to enter the annular fan blade area, and the second air inlet channel 121 is a cylindrical cavity, so the end of the straight airflow close to the driving component 3 cannot always be in a complete circular surface, and an annular surface needs to be formed in time to prevent the central area of ​​the straight airflow from colliding with the central area of ​​the driving component 3, and then the fan blades will laterally pull this part of the airflow that has been decelerated by the impact into the fan blade area. This process will inevitably produce strong turbulence and even affect the stability of the fan blade rotation, thereby generating greater noise. In the present embodiment, the straight airflow needs to pass through a section of the wavy structure 211 before approaching the driving component 3. The conical airflow 5 formed at this position can attract the straight airflow in advance and transform the circular end face of the straight airflow into a ring shape, thereby avoiding the straight airflow from hitting the central area of ​​the driving component 3 to the greatest extent, thereby reducing the occurrence of noise.

[0058] Furthermore, the curvature radius of the convexity at the top of the wavy structure 211 is smaller than the curvature radius of the concaveity at the bottom of the wavy structure 211, and the curvature radius of the concaveity at the bottom of the wavy structure 211 is greater than 4 mm;

[0059] The vertical distance between the top protrusion of the wavy structure 211 and the bottom depression of the wavy structure 211 is L1; 6mm>L1>4mm.

[0060] When the radius of curvature of the bottom depression of the wavy structure 211 is larger, the area will be larger in the same height range, which means a larger air intake. The curvature of the bottom depression and the top protrusion of the wavy structure 211 determines the entry speed of the airflow in different height intervals (layers). The closer to the lowest point of the bottom depression of the wavy structure, the faster the airflow velocity, and the slower the airflow gradually approaches the highest point of the top protrusion. The radius of curvature of the bottom depression is enlarged to avoid airflow extrusion and turbulence. The reduction of the bottom protrusion is combined with the vertical distance between the top protrusion of the wavy structure 211 and the bottom depression of the wavy structure 211 is L1; 6mm>L1>4mm, which prevents the airflow from completely passing through the top protrusion and directly entering the driving component 3, ensuring that the airflow passes through the highest point of the top protrusion or at least close to the top protrusion, and then enters the driving component 3. At this time, the airflow can form a conical airflow 5 to guide the straight airflow of the second air inlet channel 121, avoiding the airflow in the opposite direction of the first air inlet channel 111 from generating a collision and causing obvious turbulence.

[0061] Furthermore, the air inlet area of ​​the first air inlet 11 is S1; the air inlet area of ​​the second air inlet 12 is S2;

[0062] 3*S1>S2>2*S1.

[0063] The air inlet area refers to the hollow area of ​​the air inlet position. The first air inlet 11 and the second air inlet 12 can be provided with a plurality of small holes, and the air inlet area is the sum of the areas of the respective small holes.

[0064] In this embodiment, the second air inlet channel 121 is a straight channel, and the driving component 3 can easily inhale air through the second air inlet channel 121. Therefore, the second air inlet channel 121 serves as the main air inlet channel, and the air inlet area of ​​the second air inlet channel 121 is much larger than the air inlet area of ​​the first air inlet channel 111. The air inlet area of ​​the corresponding second air inlet 12 should also be larger than the air inlet area of ​​the first air inlet 11. The air inlet area of ​​the second air inlet 12 is 2 to 3 times the air inlet area of ​​the first air inlet 11, so that a sufficient amount of airflow from the first air inlet 11 flows to the collecting air inlet 21.

[0065] Furthermore, the air outlet 22 is a narrow slit structure, and the air outlet area is S3;

[0066] 3*S3>S1+S2>2*S3.

[0067] When the total air inlet area is determined, the power of the driving component 3 is constant, and the air inlet volume can be roughly determined. When the area of ​​the air outlet 22 is smaller than the area of ​​the air inlet, the pressure inside the pipe will be greater, and the wind speed and wind force of the corresponding air outlet 22 will be greater. For a hair dryer, sufficient wind speed is required to ensure the drying efficiency. At the same time, the air outlet 22 of the present application is a narrow slit structure, rather than a hole-shaped structure of a traditional hair dryer. The characteristic of the narrow slit structure is that the length is much greater than the width, which is of great help for drying a large area. Under the same air outlet area, the air outlet 22 of the narrow slit structure can directly form a large rectangular drying area when moving compared to the air outlet 22 of the hole-shaped structure. At the same time, the low-noise hair dryer of the present application can blow air for pets. After the pet takes a bath, it needs to blow air all over the body, especially for large long-haired cats and dogs, such as golden retrievers and Maine Coons, which need sufficient wind force to blow up the long hair. At the same time, the area required for blowing is very large, and the air outlet 22 of the narrow slit structure can be used for horizontal scanning blowing, which greatly improves the efficiency of drying the pet.

[0068] At the same time, the air outlet area cannot be too small. If the air outlet area is too smaller than the air inlet area, the heat in the air inlet duct cannot be discharged in time, causing the hair dryer to overheat or even burn. In this embodiment, the air outlet area and the air inlet area adopt a ratio of 3*S3>S1+S2>2*S3 to have both wind force and heat dissipation efficiency.

[0069] Example 3

[0070] Reference Figure 1 .

[0071] The housing 1 is in the form of a pipe and is bent into two sections of the same length, and the two ends of the housing 1 are located in the same plane. The first air inlet 11 is located at the bent position; the second air inlet 11 and the air outlet 22 are respectively located at the two ends of the housing 1;

[0072] The shell 1 is bent at an angle of 60°.

[0073] The outer shell 1 is configured in a pipe form (the corresponding inner shell 2 is also configured in a pipe form), and the outer shell 1 is bent into two sections of the same length. The section provided with the second air inlet 12 is the air inlet section, and the air inlet section can be directly used as a grip. The bending angle of the shell is 60°, that is, the angle between the air outlet channel 221, the air outlet direction and the grip is 60°. At this angle, the user can blow air directly toward the back, and can dry the long hair on the back.

[0074] At the same time, both ends of the shell 1 are located in the same plane, which can be used as a placement surface to place the hair dryer directly on the table. Compared with traditional hair dryers that must be hung up, it is more beautiful and convenient.

[0075] Example 4

[0076] Reference Figure 1 - Figure 4 .

[0077] It also includes a switch button 4 for switching between normal mode and pet mode;

[0078] In the pet mode, the driving component 3 sets the air outlet temperature to be less than 50°C.

[0079] Hair dryers usually have multiple gears to control wind speed and temperature. The low-noise hair dryer in this embodiment is mainly designed for pets. A switch button 4 is separately set. Click the switch button 4 to switch between normal mode and pet mode. In pet mode, the heating component of the driving component 3 sets the air outlet temperature to less than 50°C to avoid stress reactions in pets. For humans, low noise of hair dryers is only an advantage and does not affect the use of hair dryer functions. However, low noise is an indispensable condition for pet hair dryers. Therefore, loud noise will cause stress reactions in pets, especially for cats. Pets will be frightened and run away, making it impossible for the owner to dry the pets.

[0080] Furthermore, the low-noise hair dryer of this embodiment is also equipped with a sound module. When the sound module is switched to the pet mode, it will emit a simulated pet cry to attract the pet's attention. In this way, when the owner blows the hair for the pet, the pet can remain quiet, which is convenient for operation.

[0081] Example 5

[0082] Reference Figure 5 .

[0083] A low-noise hot dryer, based on the above embodiment, the air outlet area of ​​the air outlet 22 is S3; S3>S1+S2.

[0084] The biggest difference between a hot dryer and a hair dryer is the wind speed and wind force. The hot dryer has a gentle airflow, while the hair dryer has a rapid airflow. By expanding the air outlet area of ​​the air outlet 22 of the low-noise hair dryer in the above embodiment to be larger than the total air inlet area, the wind speed of the air outlet is reduced. In addition, the dryer of this embodiment is combined with the feature that the angle of the housing 1 is bent at 60°, so that the user can directly heat the back, shoulders and neck.

[0085] In addition, refer to Figure 1 - Figure 4 , provides a low-noise hair dryer in one form, and having a front end surface of a collecting air inlet 21 with a wavy structure 211. Figure 5 , providing a low-noise heat dryer that is further improved based on the aforementioned low-noise hair dryer. Figure 6 - Figure 7 , another form of a low-noise hair dryer is provided, which has a collecting air inlet 21 and a front end surface with a wavy structure 211.

[0086] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "center", "top", "bottom", "top", "bottom", "inside", "outside", "inner side", "outer side" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Among them, "inside" refers to an internal or enclosed area or space. "Periphery" refers to the area surrounding a specific component or a specific area.

[0087] In the description of the embodiments of the present invention, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0088] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "assemble" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0089] In the description of the embodiments of the present invention, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0090] In the description of the embodiments of the present invention, it is to be understood that “-” and “” represent a range with the same two values, and the range includes the endpoints. For example, “AB” represents a range greater than or equal to A and less than or equal to B. “A~B” represents a range greater than or equal to A and less than or equal to B.

[0091] In the description of the embodiments of the present invention, the term "and / or" herein is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "" herein generally indicates that the associated objects before and after are in an "or" relationship.

[0092] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-noise hair dryer, characterized in that: It includes a housing provided with a first air inlet; An inner shell is arranged inside the outer shell, a sandwich space is provided between the outer shell and the inner shell, the outer shell and the inner shell are closed and connected at the rear ends, the sandwich space stops at the closed connection position, the rear end of the inner shell forms an air outlet, and the front end of the inner shell forms a collecting air inlet; An air outlet passage is formed between the collecting air inlet and the air outlet through an inner cavity surrounded by the inner wall of the inner shell, and a driving component is arranged in the air outlet passage; Wherein, a first air inlet channel is formed between the first air inlet and the collecting air inlet through the interlayer space formed by the inner wall of the outer shell and the outer wall of the inner shell, and the first air inlet channel surrounds the driving component; Wherein, the front end surface of the collecting air inlet is a wave-shaped structure.

2. A low-noise hair dryer according to claim 1, characterized in that: A second air inlet is disposed at the front end of the housing, and the front end of the collecting air inlet faces the second air inlet; Wherein, a second air inlet passage is formed between the second air inlet and the collecting air inlet through the inner wall surface of the shell.

3. A low-noise hair dryer according to claim 2, characterized in that: The inner and outer edges of the wavy structure are both provided with rounded corners; the inner edge of the wavy structure is the edge close to the center of the collecting air inlet; the outer edge of the wavy structure is the edge away from the center of the collecting air inlet.

4. A low-noise hair dryer according to claim 3, characterized in that: The curvature radius of the convexity at the top of the wavy structure is smaller than the curvature radius of the concaveness at the bottom of the wavy structure, and the curvature radius of the concaveness at the bottom of the wavy structure is greater than 4 mm; The vertical distance between the top protrusion of the wavy structure and the bottom depression of the wavy structure is L1; 6mm>L1>4mm.

5. A low-noise hair dryer according to claim 4, characterized in that: The air inlet area of ​​the first air inlet is S1; the air inlet area of ​​the second air inlet is S2; 3*S1>S2>2*S1.

6. A low-noise hair dryer according to claim 5, characterized in that: The shell is in the form of a pipe and is bent into two sections of the same length, and the two ends of the shell are located in the same plane, the first air inlet is located at the bent position; the second air inlet and the air outlet are respectively located at the two ends of the shell; Wherein, the bending angle of the shell is 60°.

7. A low noise hair dryer according to claim 6, characterized in that: It also includes a switch button to switch between normal mode and pet mode; In the pet mode, the driving component sets the air outlet temperature to less than 50°C.

8. A low-noise hair dryer according to claim 7, characterized in that: It also includes a sound-generating module, which emits pet sounds after switching to the pet mode.

9. A low-noise hair dryer according to claim 8, characterized in that: The air outlet is a narrow slit structure, and the air outlet area is S3; 3*S3>S1+S2>2*S3.

10. A low noise heat drying machine, based on any one of claims 1 to 8, characterized in that: The air outlet area of ​​the air outlet is S3; S3>S1+S2.

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