WO2025113462A1 - Heating device of hair dryer, noise reduction air duct, and hair dryer - Google Patents

Abstract

The present invention provides a heating device of a hair dryer, comprising a heat source body and a first spiral flow guide body, wherein the heat source body is used for providing a heat source; the first spiral flow guide body is connected to the heat source body; the first spiral flow guide body is provided with a first rotating direction from an airflow inlet to an airflow outlet; the first rotating direction is the same as the rotating direction of the fan blades of the hair dryer. The present invention has the beneficial effect that the arrangement of the spiral flow guide body is conducive to reducing the collision wind noise between the rotation momentum of airflow accelerated by rotation and the flow guide body. A provided multi-pitch structure can achieve both the reduction of collision of the rotating airflow of an airflow inlet section and the functional flipping of the rotating airflow of an outlet section on hair. An airflow channel using the heating device has an obvious noise reduction effect, and the systematic noise of the hair dryer using the technology can be reduced by nearly 70%. The outlet airflow has the function of actively flipping the hair, so that the drying time of the hair dryer is reduced to the level of about 1/3.

Description

Hair dryer heating device, noise reduction air duct and hair dryer Technical Field

The present invention belongs to the technical field of fluid channel design, and relates to an airflow duct technology, and specifically to a hair dryer heating device, a noise reduction duct including the heating device, and a hair dryer.

Background Art

Hair dryers are widely used as a small electrical appliance with high popularity and have become a necessity for family life. Early hair dryers were mainly used to dry human and animal hair or objects. The main principle is to increase the evaporation rate of water through high temperature and accelerate the airflow to carry away the water. With the popularization of use and application exploration, hair dryers have gradually extended to secondary categories such as high-speed quick-drying, soft wind, commercial, household, and travel hair dryers, and have been used in derivative applications such as hair styling. Hair dryers have also extended from a single category in the early days to subdivided functional categories of products, which have been widely accepted and activated the innovative development direction of hair dryers.

With the maturity of hair dryer technology and the homogenization of product competition, discovering deeper problems in the application field, or defining a dedicated hair dryer category and developing secondary category products have become effective means to get rid of homogeneous competition and obtain differentiated brand value, and are also one of the main market demands.

Among the numerous hair dryer subcategories, there is currently a market gap in the application of hair dryers for pets, and its products are mainly used directly for human hair dryers. However, human hair dryers are designed for drying human hair, and there are at least the following specific problems: 1. The wind receiving surface is designed to meet the needs of human heads, which is smaller than the needs of some large pets such as dogs; 2. Human hair is relatively heavy and usually falls to the ground for easy cleaning, but pet hair is lighter and easily floats into the air and spreads everywhere during the drying process; 3. The amount of pet hair can be several times that of human hair, and it takes too long for human hair dryers to dry hair; 4. Most pets are sensitive to the noise of hair dryers and show irritability, which is even one of the main causes of depression in most canine pets; 5. Pet hair is relatively dense, and it is generally difficult for human hair dryers to reach the cortex of the hair. In the early stage of drying, the hot air usually stays on the surface of the hair, causing the pet's cortex to be moist for a long time, which is easy to cause colds and other diseases.

Among the factors that contribute to the noise of a hair dryer, the mechanical noise caused by the rotation of the fan and motor and the wind noise caused by the high-speed flow of air account for more than 90% of the noise of a hair dryer. With the maturity of the motor and hair dryer fan propulsion technology, the proportion of mechanical noise is getting smaller and smaller. In traditional hair dryers, the noise caused by the vibration of the resistance wire on the heating element (usually including a barrel-shaped heating resistance wire wound around a bracket) under the impact of high-speed airflow accounts for the vast majority of the wind noise.

Summary of the invention

In order to solve the above-mentioned prior art problems, the present invention provides a hair dryer air duct and a hair dryer, and the optional implementation schemes are as follows:

A hair dryer heating device, characterized in that it comprises:

Heat source;

The first spiral guide body;

Wherein, the heat source body is used to provide a heat source;

Wherein, the first spiral body guide is connected to the heat source body;

Wherein, the first spiral guide body has a first rotation direction from the air flow inlet to the air flow outlet;

Wherein, the first rotation direction is the same as the rotation direction of the fan blades of the hair dryer.

One of the optional solutions is characterized in that

The first spiral guide body has a first pitch and a second pitch;

Among them, the air flow inlet is the first pitch a1;

Wherein, the airflow outlet is the second pitch a2;

Among them, a1＜a2.

One of the optional solutions is characterized in that

The first spiral guide body has a first pitch and a second pitch;

Among them, the air flow inlet is the first pitch a1;

Wherein, the airflow outlet is the second pitch a2;

Among them, a1＞a2.

One of the optional solutions is characterized in that,

2*a4≤a1≤5*a4;

Wherein, a4 is the average airflow rotation pitch formed when the hair dryer is at medium speed.

One of the optional solutions is characterized in that,

1mm≤d1≤3mm;

Wherein, d1 is the thickness of the end M1 of the first spiral guide body located at the air flow inlet.

One of the optional solutions is characterized in that

The end M1 is an arc-shaped surface or a streamlined surface.

The noise reduction air duct is characterized by comprising:

An air inlet channel having a first air inlet port and a second air inlet port;

An air outlet channel having a first air outlet port and a second air outlet port;

Wherein, the first air inlet port is connected to the air flow inlet;

Wherein, the first air outlet port is connected to the air flow outlet;

Wherein, in the working state, the second air inlet port is connected with the second air outlet port;

Wherein, the air outlet channel is provided with the hair dryer heating device.

One of the optional solutions is characterized in that

The air inlet channel is arranged around the air outlet channel.

One of the optional solutions is characterized in that

0.8*S1≤S2≤1.3*S1;

Wherein, S1 is the minimum cross-sectional area of the air outlet channel perpendicular to the air flow axis;

Wherein, S2 is the minimum cross-sectional area of the air inlet channel perpendicular to the air flow axis.

A hair dryer, characterized in that it comprises:

The hair dryer noise reduction air duct.

The beneficial effect of the present invention is that the heat source body provided with the first spiral guide body heats the high-speed airflow flowing through; at the same time, the setting of the spiral guide body is conducive to reducing the collision wind noise between the rotational momentum of the airflow (with about 10-30% of the rotating airflow) that has been accelerated by rotation and the guide body. The multi-pitch structure can take into account both the reduction of the collision of the rotating airflow at the airflow inlet section and the functional flipping of the hair by the rotating airflow at the outlet section. The airflow channel using the heating device has a significant low-noise effect, and the hair dryer using this technology can reduce its systemic noise by nearly 70%. Combined with the function of the outlet airflow to actively flip the hair, the air-drying time of the hair dryer product is reduced to about 1/3.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the three-dimensional structure of a heating device for a hair dryer provided by the present invention;

FIG2 is a schematic diagram of a three-dimensional cross-sectional structure of a hair dryer heating device provided by the present invention;

FIG3 is a schematic front cross-sectional view of a hair dryer heating device provided by the present invention;

FIG4 is a schematic cross-sectional three-dimensional structural diagram of a noise reduction air duct provided by the present invention;

FIG5 is a schematic cross-sectional view of the noise reduction air duct S1 provided by the present invention;

FIG6 is a schematic cross-sectional view of the noise reduction air duct S2 provided by the present invention.

Reference numerals:

1. First spiral guide body; 2. Heat source body; 3. Air inlet channel; 31. First air inlet port; 32. Second air inlet port; 4. Air outlet channel; 41. First air outlet port; 42. Second air outlet port.

DETAILED DESCRIPTION

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.

Embodiment 1:

As shown in Figures 1 to 3,

A hair dryer heating device, comprising:

Heat source 2;

The first spiral guide body 1;

Wherein, the heat source body 2 is used to provide a heat source;

Wherein, the first spiral guide body 1 is connected to the heat source body 2;

The first spiral guide body 1 has a first rotation direction from the air flow inlet to the air flow outlet;

Wherein, the first rotation direction is the same as the rotation direction of the fan blades of the hair dryer.

In this embodiment, the heat source 2 is used to provide a heat source for the hair dryer, and the heat source can be an electric heat resistance wire, an electric heating element, or other forms of heat energy, such as a cavity for placing an external heat source with a high heat storage capacity. It should be understood that the connection between the first spiral guide body 1 and the heat source body 2 indicates that they are in a connected state, and should not be limited to being understood as an integrated structure or a disassembled and assembled structure.

In addition, the spiral can be distributed throughout the streamline of the air outlet channel 4, or it can exist in a part of the air outlet channel 4. The first rotation direction of the spiral can be understood as a rotation direction that the airflow includes after entering from the second air outlet port 42 of the air outlet channel 4, in addition to the axial movement direction pointing to the first air outlet port 41. In the structure of this embodiment, the fan blades accelerate the airflow through rotation and form a high-speed airflow. At the same time, the axial high-speed airflow formed due to the rotation of the fan also has a certain rotation direction speed. When a design scheme with the same rotation direction as the fan blade is adopted, the collision with the air outlet channel 4 caused by the momentum of the airflow in the rotation direction can be further reduced, thereby reducing wind noise.

Embodiment 2:

As shown in Figures 1 and 2,

In one optional embodiment, the first spiral guide body 1 has a first pitch and a second pitch;

Among them, the air flow inlet is the first pitch a1;

Wherein, the airflow outlet is the second pitch a2;

Among them, a1＜a2.

Embodiment 3:

An alternative implementation scheme,

The first spiral guide body 1 has a first pitch and a second pitch;

Among them, the air flow inlet is the first pitch a1;

Wherein, the airflow outlet is the second pitch a2;

Among them, a1＞a2.

In Examples 2 and 3, the spiral structure is applied to the air outlet channel 4 of the hair dryer, which can reduce the collision noise with the channel caused by the momentum of the high-speed airflow in the rotation direction, and also maintain a certain rotation momentum of the air outlet at the outlet end of the air outlet channel 4. When the rotation momentum of the air outlet port is applied to drying pet hair, it provides high-temperature and high-speed drying while also providing a certain airflow to flip the hair in the covered area, so that the hair can be flipped and stroked while being air-dried, which will greatly improve the air-drying efficiency and reduce the drying time.

When the solutions of Example 2 and Example 3 are preferably adopted, the two sets of effects, hair flipping function and rotating wind direction noise reduction, can be independently customized by adjusting the front and rear end pitches of the spiral, and the change of the mid-end pitch of the spiral with different pitches with smooth transition has little effect on wind noise.

As an optional solution, the first spiral guide body 1 may also include a third pitch a3. The guide body segment set to the third pitch a3 is located in the middle of the first pitch a1 guide body segment and the second pitch a2 guide body segment. Among them, the first pitch a1 guide body segment is used to connect with the outlet end of the fan blade to realize the airflow into the guide body channel; the second pitch a2 guide body segment is used for output, so that the output airflow meets the functional requirements of hair flipping. The third pitch a3 guide body end is appropriately smaller than the first pitch a1, and smaller than the second pitch a2, and the beneficial effect is that the airflow channel is longer, the heat exchange time between the airflow and the heat source body 2 is longer, and/or the heat exchange area is larger.

On this basis, an optional solution can also be set to concentrate the thermal power of the heat source body 2 in the middle section (a3 pitch section), such as the thermal power of this section is 60-90% of the total power.

One of the reasons for setting this form is that the heat source body 2 structure of the traditional electric heating wire has a large wind resistance surface, and the heating wire is very easy to vibrate and cause wind noise. After adopting this structure, the wind resistance can be reduced, and the directional wind noise caused by the partial rotation of the airflow caused by the accelerated rotation of the fan can be effectively reduced. At the same time, the heat exchange area is increased without significantly increasing the wind noise by the a3 pitch segment, thereby compensating for the poor heating effect of the heat source body 2 after the heating wire structure is replaced.

Embodiment 4:

As shown in Figure 2,

An alternative implementation scheme,

2*a4≤a1≤5*a4;

Wherein, a4 is the average airflow rotation pitch formed when the hair dryer is at medium speed.

In a hair dryer with a fan that accelerates the airflow, about 10-30% of the airflow rotates and follows after the airflow is accelerated. Setting the first pitch a1 with a pitch of 2-5 times the airflow rotation pitch can basically completely suppress the wind noise caused by the airflow rotation factor and maintain the smoothness of the axial flow of the airflow.

Embodiment 5:

As shown in Figure 2,

An alternative implementation scheme,

1mm≤d1≤3mm;

Wherein, d1 is the thickness of the end M1 of the first spiral guide body 1 located at the air flow inlet.

Embodiment 6:

As shown in Figure 2,

An alternative implementation scheme,

The end M1 is an arc-shaped surface or a streamlined surface.

There is usually a thinner structure at the end of the spiral guide body. Tests have found that this part will generate a certain amount of wind noise. By setting the thickness of the end M1 to 1-3mm, this part of the wind noise is effectively controlled. In addition, when the heat source is installed on the hair dryer to form an air outlet channel, the cross-section of the formed channel perpendicular to the direction of the blowing axis is larger at the end away from the air outlet. That is, the heat source can be set to a cone-like structure with one end larger and the other end smaller. The transition between the large and small structures can be a smooth curved surface, and the end away from the hair dryer outlet is the small end, and the hair dryer outlet is the large end. This design is effective in reducing the collision between the high-speed airflow at the fan end and the heat source.

Embodiment 7:

As shown in Figure 4,

The noise reduction air duct is characterized by comprising:

An air inlet channel 3 having a first air inlet port 31 and a second air inlet port 32;

An air outlet channel 4 having a first air outlet port 41 and a second air outlet port 42;

Wherein, the first air inlet port 31 is connected to the air flow inlet;

Wherein, the first air outlet port 41 is connected to the air flow outlet;

Wherein, in the working state, the second air inlet port 32 is connected with the second air outlet port 42;

Wherein, the air outlet channel 4 is provided with the hair dryer heating device.

Embodiment 8:

As shown in Figure 4,

One of the options is

The air inlet channel 3 is disposed around the air outlet channel 4 .

In this embodiment, the air inlet channel 3 is arranged around the air outlet channel 4, and a sandwich air inlet structure is formed in the product structure. For a hair dryer, the air flow velocity of the air outlet channel 4 is usually much higher than that of the air inlet channel 3, and a heating component is usually arranged in the air outlet channel 4. After the heating component is filled in the air outlet channel 4, it will form more air flow collisions with the air outlet channel 4, and the wind noise of the hair dryer usually comes from this. Generally speaking, in addition to the mechanical noise (mainly from the rotation of the fan motor and the air flow impact of the fan blades), the main noise source of the hair dryer is the wind noise of the air outlet channel 4. Under the structure of this embodiment, the path of wind noise and mechanical noise transmitted to the external space in the use state is the channel wall of the air outlet channel 4, the air inlet channel 3, the channel outer wall of the air inlet channel 3 and/or the hair dryer housing. It can be seen that the propagation path of the noise includes at least 4 layers of medium interface, and the medium interface can attenuate the sound wave energy to a large extent. Therefore, when the air duct of the hair dryer in this embodiment is used, the noise is low. For the reduction of wind noise, the air flow flowing in the air inlet channel 3 also has a certain noise energy absorption effect. Under this combined effect, the structure of this embodiment can reduce wind noise energy by at least 40%, thereby reducing the noise during use of the hair dryer.

For the pet hair dryer used in this embodiment, the wind noise reduction technology also has special meaning. For human hair dryers, it is sufficient to control the mechanical noise of the motor to a certain extent, and the acceptance of wind noise is relatively high. However, pets (such as dogs) are highly sensitive to the noise of hair dryers. Surveys have shown that hair dryers are the main cause of depression in pet dogs. In American cities, the average depression rate of canine pets is nearly 70%. Therefore, reducing the noise of pet hair dryers and increasing the friendliness of hair dryer products to pets is very likely to become an effective measure to cure pet depression. The multiple noise reduction effects in this application will also be superimposed on the market acceptance effect of pet hair dryers.

It should be understood that the “working state” in this embodiment is not a limitation on the protection scope of this application, but merely expresses a state of this embodiment, that is, even if the second air inlet port 32 and the second air outlet port 42 are not connected (such as semi-finished products in the factory processing process, or products of a supplier when multiple suppliers collaborate to complete, or an assemblable split structure that is suspected of being deliberately made to avoid infringement, which may manifest as such a disconnected state), it obviously cannot be used as a basis for non-infringement.

Embodiment 9:

As shown in Figures 5 and 6,

One of the options is

0.8*S1≤S2≤1.3*S1;

Wherein, S1 is the minimum cross-sectional area of the air outlet channel 4 perpendicular to the air flow axis;

Wherein, S2 is the minimum cross-sectional area of the air inlet channel 3 perpendicular to the air flow axis.

Based on the scheme of this embodiment, the minimum airflow channels of the air outlet channel 4 and the air inlet channel 3 are relatively balanced. In general human hair dryers, the air inlet channel 3 is relatively short and the air inlet is relatively large, which has the effect of sufficient inlet airflow. When adjusted to the scheme of this application, the air inlet channel 3 is relatively long. If the proportion of the air inlet channel 3 is not considered based on the idea of designing a human hair dryer, it is easy for the front and rear loads of the fan blades to be unbalanced, resulting in obvious vibration of the fan blades, which in turn leads to problems such as sharp noise in addition to the weakening of structural durability. Structures outside the proportion will also cause extremely narrow high-speed airflow in the air inlet channel 3 or the air outlet channel 4, which is easy to form strong wind noise.

Embodiment 10:

A hair dryer, characterized in that it comprises:

The hair dryer noise reduction air duct.

When the hair dryer of this embodiment is used to dry the hair of a dog or pet, the hair drying time can be shortened to about 1/3 of the time of the original hair dryer, and the air drying speed is significantly improved. In addition, the overall noise is reduced by nearly 70%.

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.

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.

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.

In the description of the embodiments of the present invention, the term "and/or" herein is merely 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.

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 (10)

A hair dryer heating device, characterized in that it comprises: Heat source; The first spiral guide body; Wherein, the heat source body is used to provide a heat source; Wherein, the first spiral body guide is connected to the heat source body; Wherein, the first spiral guide body has a first rotation direction from the air flow inlet to the air flow outlet; Wherein, the first rotation direction is the same as the rotation direction of the fan blades of the hair dryer. The hair dryer heating device according to claim 1, characterized in that: The first spiral guide body has a first pitch and a second pitch; Among them, the air flow inlet is the first pitch a1; Wherein, the airflow outlet is the second pitch a2; Among them, a1＜a2. The hair dryer heating device according to claim 1, characterized in that: The first spiral guide body has a first pitch and a second pitch; Among them, the air flow inlet is the first pitch a1; Wherein, the airflow outlet is the second pitch a2; Among them, a1＞a2. The hair dryer heating device according to claim 2 or 3, characterized in that: 2*a4≤a1≤5*a4; Wherein, a4 is the average airflow rotation pitch formed when the hair dryer is at medium speed. The hair dryer heating device according to claim 2 or 3, characterized in that: 1mm≤d1≤3mm; Wherein, d1 is the thickness of the end M1 of the first spiral guide body located at the air flow inlet. The hair dryer heating device according to claim 5 is characterized in that: The end M1 is an arc-shaped surface or a streamlined surface. The noise reduction air duct is characterized by comprising: An air inlet channel having a first air inlet port and a second air inlet port; An air outlet channel having a first air outlet port and a second air outlet port; Wherein, the first air inlet port is connected to the air flow inlet; Wherein, the first air outlet port is connected to the air flow outlet; Wherein, in the working state, the second air inlet port is connected with the second air outlet port; Wherein, the air outlet channel is provided with a hair dryer heating device as described in any one of claims 1-6. The noise reduction air duct according to claim 7 is characterized in that: The air inlet channel is arranged around the air outlet channel. The noise reduction air duct according to claim 7 or 8 is characterized in that: 0.8*S1≤S2≤1.3*S1; Wherein, S1 is the minimum cross-sectional area of the air outlet channel perpendicular to the air flow axis; Wherein, S2 is the minimum cross-sectional area of the air inlet channel perpendicular to the air flow axis. A hair dryer, characterized in that it comprises: The noise reduction air duct of the hair dryer as described in any one of claims 7 to 9.