Direct blowing type noise reduction hair drier

Abstract

The invention discloses a direct blowing type noise reduction hair drier. An air inlet and an air outlet which are communicated with the interior of an outer shell are formed in the outer shell; a motor flow channel is arranged in the outer shell, the fan motor is arranged in the motor flow channel, and the air inlet, the air outlet and the motor flow channel are located in the same axial position. The inner wall of the outer shell is in clearance fit with the outer wall of the motor runner, and the motor runner is in point connection with the outer shell only through a bolt assembly; an airflow inlet of the motor runner is provided with two groups of flow equalizing nets which are arranged layer by layer along the air inlet direction; and a layer of silencing cotton is arranged between the two groups of flow equalizing nets in the circumferential direction of the inner wall of the motor flow channel. According to the direct blowing type blower, the double-layer flow equalizing net is arranged at the airflow inlet of the flow channel of the motor, so that the flow equalizing net can improve the cleanliness of the incoming flow of the blower, reduce the pre-swirl and vortex of the incoming flow and improve the uniformity of the incoming flow during air intake, and the incoming flow impact noise, blade top gap noise and the like of the direct blowing type blower are further reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of hair dryers and relates to a direct-blowing noise-reducing hair dryer. Background Art

[0002] With the booming development of high-speed brushless DC fan motors, the competition in the whole hair dryer industry is becoming increasingly fierce. Correspondingly, the requirements for large air volume, low noise, high lifespan, and high-efficiency fan motors are also getting higher and higher.

[0003] However, in the prior art, the following problems mainly exist in hair dryer products:

[0004] 1) Traditional household "big-head direct-blow" hair dryers use series-excited fan motors, and the rotor uses a carbon brush contact physical commutator, which is prone to wear and has a low service life;

[0005] 2) To obtain a large air volume, the fan uses a semi-open centrifugal impeller with a large diameter. The air flow enters the fan blades axially and exits radially. Relying on the contracted housing and the flow inclination of the centrifugal impeller hub to squeeze the air flow out of the air duct, the forced flow causes a large loss of air velocity, and the air flow impact noise radiation on the housing is relatively large, resulting in a relatively high overall noise of the hair dryer;

[0006] 3) In order to comply with the advocacy of energy conservation and consumption reduction in all walks of life, traditional whole-machine manufacturers are also actively thinking about replacing traditional fan motors with large air volume, low noise, high lifespan, and high-efficiency fans at the lowest cost and to the greatest extent. In this way, the sharing of most of the shell materials of the whole machine can be realized, the enterprise cost can be reduced, and the product upgrade can be achieved;

[0007] 4) The nozzles of traditional hair dryers are often flat or have circular / round holes at the outlet. In terms of the use experience, due to the dissipation of the air flow, the air flow force blown onto the hair is insufficient / weak. Summary of the Invention

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A direct-blowing noise-reducing hair dryer includes: a hair dryer-style outer housing and a fan motor disposed in the outer housing;

[0010] An air inlet and an air outlet communicating with the inside are provided in the outer housing; a motor flow channel is provided inside the outer housing, the fan motor is disposed in the motor flow channel, and the air inlet and the air outlet are located at the same axial position as the motor flow channel;

[0011] The inner wall of the outer housing and the outer wall of the motor flow channel are in clearance fit, and the motor flow channel is only connected to the outer housing at points through bolt assemblies;

[0012] Two groups of uniform flow meshes are provided at the air inlet of the motor flow channel and are arranged layer by layer along the air inlet direction.

[0013] And a layer of sound-absorbing cotton is provided in the circumferential direction along the inner wall of the motor flow channel between the two groups of current-sharing meshes.

[0014] As a further solution of the present invention: the blower motor adopts a permanent magnet DC brushless motor structure.

[0015] As a further solution of the present invention: the motor fan of the blower motor adopts an axial-flow impeller, and the air flow can flow in and out axially inside the motor flow channel.

[0016] As a further solution of the present invention: the motor flow channel is composed of an inner shell motor bracket for fixing the blower motor and a main flow channel extending towards the air outlet;

[0017] The inner shell motor bracket is formed by buckling two half-opened shell sleeve structures, which fixes and limits the blower motor inside and forms the front section of the motor flow channel.

[0018] As a further solution of the present invention: a control board for controlling electronic components is provided in the outer shell body, and the control board has an annular structure and is arranged at the inlet section position of the motor flow channel.

[0019] As a further solution of the present invention: an outlet protection net is provided at the outlet position of the motor flow channel, and the outlet protection net is selected from one of an air outlet grille or a porous grid structure.

[0020] As a further solution of the present invention: a rubber sealing ring is provided at the position between the outer side of the outlet section of the inner shell motor bracket and the main flow channel.

[0021] As a further solution of the present invention: a group of Laval nozzles are installed at the air outlet position of the outer shell body; the Laval nozzles are composed of multiple groups of concentrically arranged converging-diverging channels, and each channel is independently and spaced apart.

[0022] As a further solution of the present invention: a plurality of heating wire mica sheets are evenly distributed in the circumferential direction of the main flow channel, and the heating wire mica sheets act as a heating wire bracket to arrange a heating wire at the center position of the main flow channel.

[0023] Advantages of the present invention:

[0024] 1. The blower motor adopts a permanent magnet DC brushless motor structure, the armature magnetic field adopts electronic commutation, the rotor has no mechanical contact, and the overall service life is high.

[0025] 2. The motor fan of the blower motor adopts an axial-flow impeller, and the air flow can flow in and out axially inside the motor flow channel, which is more in line with the main air flow direction of the direct-blow hair dryer and can achieve higher working efficiency.

[0026] 3. The three-layer noise reduction structure is formed by the double-shell structure with clearance fit, and the effect of reducing external wind noise can be achieved.

[0027] 4. By setting up a double-layer flow equalizing net at the air inlet of the motor flow channel, when the air enters, the flow equalizing net can improve the "cleanliness" of the air flow from the blower, reduce the pre-rotation and eddy current of the incoming air flow, improve the uniformity of the incoming air flow, and thus reduce the impact noise of the incoming air flow and the tip clearance noise of the direct blow hair dryer, etc.

[0028] 5. By setting up a Laval nozzle, the effect of equalizing the flow and accelerating the speed at the outlet of the hair dryer is achieved, providing a stronger hair drying force, improving the stiffness of the air flow, and the air flow hitting the scalp is like a finger massage, enhancing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of the present invention.

[0030] Figure 2 It is a schematic structural diagram of the motor flow channel in the present invention.

[0031] Figure 3 It is another schematic structural diagram of the motor flow channel in the present invention.

[0032] Figure 4 It is a streamline diagram of the simulation verification of the present invention.

[0033] Figure 5 It is a streamline diagram of the simulation verification of the flow equalizing structure in the present invention.

[0034] Figure 6 It is a streamline diagram of the simulation verification in the prior art without a Laval nozzle installed.

[0035] Figure 7 It is a streamline diagram of the simulation verification of the Laval nozzle structure in the present invention.

[0036] Figure 8 It is another streamline diagram of the simulation verification of the Laval nozzle structure in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. It should be understood that the present application is not limited by the exemplary embodiments disclosed herein. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 should not be construed as a limitation to the present invention.

[0039] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0040] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] The present invention provides, please refer to Figures 1 to 3 , in the embodiments of the present invention, a direct-blow noise-reducing hair dryer, comprising: a housing 1 in the shape of a hair dryer and a blower motor 3 disposed in the housing 1;

[0042] An air inlet 11 and an air outlet 12 communicating with the inside are provided in the housing 1; a motor flow channel 2 is provided inside the housing 1, the blower motor 3 is disposed in the motor flow channel 2, and the air inlet 11 and the air outlet 12 are located at the same axial position as the motor flow channel 2; during operation, the air flow is introduced from the air inlet 11 through the blower motor 3 and discharged from the air outlet 12 after being guided by the motor flow channel 2;

[0043] Among them, the blower motor 3 adopts a permanent magnet direct current brushless motor structure, the armature magnetic field uses electronic commutation, the rotor has no mechanical contact, and the overall service life is high;

[0044] The motor fan of the blower motor 3 adopts an axial flow impeller, and the air flow can flow in and out axially inside the motor flow channel 2, which is more in line with the main air flow direction of the direct-blow hair dryer and can achieve higher working efficiency;

[0045] There is a clearance fit between the inner wall of the outer housing 1 and the outer wall of the motor flow channel 2. The motor flow channel 2 is only connected to the outer housing 1 at the installation position through a bolt assembly to form a point connection; the motor flow channel 2, the outer housing 1, and the clearance between the two form a three-layer noise reduction structure to achieve the effect of reducing external wind noise.

[0046] At the air inlet of the motor flow channel 2, there are two groups of flow equalizing meshes 22 arranged layer by layer along the air inlet direction. When the air enters, the flow equalizing meshes 22 can improve the "cleanliness" of the air flow from the fan, reduce the pre-rotation and eddy current of the incoming flow, improve the uniformity of the incoming flow, and thus reduce the incoming flow impact noise and tip clearance noise of the direct-blow hair dryer, etc.; specifically, refer to Figures 4 - 5 It can be seen from the streamline diagram of the simulation verification in that the incoming flow adjusted by the flow equalizing meshes 22 can enter the fan evenly, achieving the effect of reducing the incoming flow impact noise.

[0047] And there is a layer of sound-absorbing cotton 23 arranged along the circumferential direction of the inner wall of the motor flow channel 2 between the two groups of flow equalizing meshes 22. The sound-absorbing cotton 23 is used to absorb the incoming flow impact noise, better improving the overall noise reduction performance.

[0048] Furthermore, the motor flow channel 2 is composed of an inner shell motor bracket 25 for fixing the fan motor 3 and a main flow channel 26 extending towards the air outlet 12.

[0049] The inner shell motor bracket 25 is formed by buckling two semi-open shell structures, fixing and limiting the fan motor 3 inside, and forming the front section of the motor flow channel 2.

[0050] Even further, a control board 5 for controlling electronic components such as the fan motor 3 and the heating wire is also provided in the outer housing 1. The control board 5 is in a ring structure, arranged at the inlet section position of the motor flow channel 2, and there is an outward convex platform formed on the control board 5, which is threadedly connected to the inlet section position of the motor flow channel 2.

[0051] Even further, an outlet protection net 21 is provided at the outlet position of the motor flow channel 2. The outlet protection net 21 is selected from one of an air outlet grille or a porous grid structure; among them, the air outlet grille can block foreign objects; while the porous grid can improve the uniformity of the outflow while achieving the blocking work.

[0052] The clearance fit between the inner wall of the outer housing 1 and the outer wall of the motor flow channel 2 forms a heat dissipation cavity 6. Refer to Figure 5 the streamline diagram of the simulation verification in . According to the figure, it can be seen that when the fan motor 3 is working, the air flow entrainment effect causes a secondary heat dissipation air flow to be generated in the heat dissipation cavity 6, which is inhaled into the motor flow channel 2 and merges with the main flow, thus achieving the effect of dissipating heat from the control board 5.

[0053] Furthermore, a set of Laval nozzles 4 are installed at the position of the air outlet 12 of the outer shell 1, and the Laval nozzles 4 and the hair dryer are connected in a bidirectional plug-in manner by a connecting piece;

[0054] The Laval nozzle 4 is composed of multiple sets of concentrically arranged converging-diverging channels, and each channel is independently and spaced apart; compared with traditional nozzles, the flow velocity of the air flow increases, improving the stiffness of the air flow. The air flow hitting the scalp is like finger massage, enhancing the user experience. For specific details, please refer to Figures 6 to 8 the streamline diagram verified by simulation of Figure 6 the structure of the hair dryer without the Laval nozzle 4 in the prior art, while Figures 7 - 8 is the structure after installing the Laval nozzle 4. After installing the Laval nozzle 4, the average flow velocity at the outlet of the hair dryer increases significantly. The figure shows the isosurface of the wind speed greater than 30 m / s. It can be seen that the dark gray wind speed isosurface at the outlet is relatively uniform and concentrated within the pull-type nozzle, providing a stronger hair drying force.

[0055] Furthermore, a plurality of heating wire mica sheets 28 are evenly distributed in the circumferential direction of the main flow channel 26, and the heating wire 29 is arranged at the center position of the main flow channel 26 by using the heating wire mica sheet 28 as a heating wire support. When the air flow enters the main flow channel 26, the hot air effect is achieved through the heating wire. At the same time, the inner liner of the heating wire 29 and the heating wire mica sheet 28 will divide the main flow channel 26 into a plurality of air flow channels, achieving the effect of shunting and guiding the air flow to the Laval nozzle 4.

[0056] Furthermore, a rubber sealing ring 24 is provided between the outer side of the outlet section of the inner shell motor bracket 25 and the main flow channel 26 (heating wire). On the one hand, it reduces / regulates the flow rate of the secondary heat dissipation air flow between the motor flow channel 2 and the outer shell 1, isolating the air flow passing through the heating wire from flowing back to the air inlet of the fan, causing energy loss. On the other hand, it provides circumferential support and limitation for the inner shell motor bracket 25, improving the stability of the bracket. In addition, it increases the turbulence of the air flow entering the outlet of the inner shell motor bracket 25 through the fan motor 3, increasing the vibration at the end of the bracket. The rubber sealing ring 24 has a certain vibration absorption and noise reduction effect.

[0057] It should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0058] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A direct blow type noise reduction hair dryer, characterized in that, Comprising: A hair dryer-style outer housing and a blower motor disposed in the outer housing; An air inlet and an air outlet communicating with the interior are provided in the outer housing; a motor flow channel is provided inside the outer housing, the blower motor is disposed in the motor flow channel, and the air inlet and the air outlet are located at the same axial position as the motor flow channel; There is a clearance fit between the inner wall of the outer housing and the outer wall of the motor flow channel, and the motor flow channel is only connected to the outer housing at points through bolt assemblies; Two sets of flow equalizing nets arranged layer by layer along the air inlet direction are provided at the air inlet of the motor flow channel; And a layer of sound-absorbing cotton is provided in the circumferential direction along the inner wall of the motor flow channel between the two sets of flow equalizing nets.

2. The direct-blow noise-reducing hair dryer according to claim 1, characterized in that, The blower motor adopts a permanent magnet direct current brushless motor structure.

3. The direct-blow noise-reducing hair dryer according to claim 1, wherein The motor fan of the blower motor adopts an axial flow impeller, and air can flow in and out axially inside the motor flow channel.

4. The direct blow noise reduction hair dryer according to claim 1, wherein, The motor flow channel is composed of an inner housing motor bracket for fixing the blower motor and a main flow channel extending towards the air outlet; The inner housing motor bracket is formed by buckling two semi-open shell sleeve structures, fixes and limits the blower motor therein, and forms the front section of the motor flow channel.

5. A direct-blow noise-reducing hair dryer according to any one of claims 1 or 4, characterized in that, A control board for controlling electronic components is provided in the outer housing, and the control board is in a ring structure and is disposed at the inlet section position of the motor flow channel.

6. A direct-blow noise-reducing hair dryer according to any one of claims 1 or 4, characterized in that An outlet protection net is provided at the outlet position of the motor flow channel, and the outlet protection net is selected from one of an air outlet grille or a porous grid structure.

7. The direct-blow noise-reducing hair dryer according to claim 4, wherein, A rubber sealing ring is provided at the position between the outer side of the outlet section of the inner housing motor bracket and the main flow channel.

8. The direct-blow noise-reducing hair dryer according to claim 1, characterized in that, A set of Laval nozzles is installed at the air outlet position of the outer housing; the Laval nozzles are composed of multiple sets of concentrically arranged converging-diverging channels, and the channels are independently spaced from each other.

9. The direct blow type noise reduction hair dryer according to claim 4, wherein, A plurality of heating wire mica sheets are evenly distributed in the circumferential direction of the main flow channel, and a heating wire is arranged at the center position of the main flow channel by using the heating wire mica sheets as a heating wire support.

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