A noise reducer and a hair dryer

Abstract

The present invention provides a noise reducer and a hair dryer, which relate to the technical field of hair dryers and solve the problem of relatively large noise in the prior art hair dryers. The present invention includes a ventilation frame and a valve; a first ventilation hole and a second ventilation hole are provided on the frame surface of the ventilation frame; the valve is arranged at one end of the first ventilation hole, and the valve can adjust the opening degree of the first ventilation hole to adjust the ventilation area of the ventilation frame. Compared with the prior art, the present invention combines the valve with the ventilation frame, and adjusts the size of the first ventilation hole of the ventilation frame by opening and closing the valve, so as to change the passing area of the noise, so that the noise is more blocked and reflected before passing, and is absorbed by the structural material, achieving the purpose of noise reduction, and can further reduce the noise of the hair dryer on the existing basis.

Description

Technical Field

[0001] The present invention relates to the technical field of hair dryers, and specifically, to a noise reducer and a hair dryer. Background Art

[0002] The existing hair dryer is powered by a motor inside the air duct to drive the blades to rotate, suck in air from the outside, and blow the sucked air to a heating element in front of the motor for heating and then blowing out. The noise generated when using the hair dryer mainly comes from the motor. Most of the noise generated during the operation of the motor propagates backward through the air inlet net at the tail of the hair dryer air duct and spreads outwards. A small part of the noise collides with the various structures of the hair dryer and is absorbed and weakened. Currently, the hair dryers on the market mainly reduce noise by using low-noise motors and redesigned air duct structures. The noise is generally controlled between 80 - 86 decibels. It is very difficult to further reduce the noise, and there is a problem of relatively high noise, which has a negative impact on the physical health of users and surrounding people.

[0003] In addition, some hair dryers can be equipped with aromatherapy at the front end of the air duct to give the blown air a fragrance to soothe the body and mind. However, the front end of the air duct belongs to a high-temperature area, and the blown temperature is very high. The aromatherapy will quickly evaporate at high temperatures, resulting in a short usage time. At the same time, the aromatherapy located at the front end of the air duct will affect the air flow acting on the hair, reducing the hair drying efficiency of the hair dryer. Summary of the Invention

[0004] One of the purposes of the present invention is to design a noise reducer and a hair dryer to solve the problem of relatively high noise of the hair dryer.

[0005] The present invention is achieved by the following technical solutions:

[0006] The present invention provides a noise reducer, including a ventilation frame and a valve; first ventilation holes and second ventilation holes are provided on the frame surface of the ventilation frame; the valve is arranged at one end of the first ventilation hole, and the valve can adjust the opening degree of the first ventilation hole to adjust the ventilation area of the ventilation frame.

[0007] When adopting the above setting structure, the valve is combined with the ventilation frame, and the size of the first ventilation hole of the ventilation frame can be adjusted by opening and closing the valve. Therefore, this kind of noise reducer can adjust the ventilation area of the entire ventilation frame by adjusting the opening degree of the first ventilation hole, and can change the passing area of the noise in this way, so that the noise is more blocked, reflected and absorbed by the structural material before passing, achieving the purpose of noise reduction, and enabling the noise of the hair dryer to be further reduced on the existing basis. The setting of the second ventilation hole can ensure the most basic air intake of the hair dryer when reducing noise.

[0008] Furthermore, to better implement the present invention, the following setting structure is particularly adopted: the first ventilation hole and the second ventilation hole are arranged in sequence from the inside to the outside on the frame surface of the ventilation frame, and the second ventilation hole is located at a position between the outer frame of the ventilation frame and the outside of the valve.

[0009] When the above setting structure is adopted, the first ventilation hole is located inside the ventilation frame compared with the second ventilation hole, so that the valve can be arranged close to the center of the ventilation frame. Then, when reducing noise, more noise can pass through the ventilation holes on the outer side of the ventilation frame, making the noise passing through each part of the ventilation frame more consistent.

[0010] Furthermore, to better implement the present invention, the following setting structure is particularly adopted: the first ventilation hole is arranged at the center of the frame surface of the ventilation frame, and a plurality of the second ventilation holes are arranged in sequence around the circumference of the first ventilation hole.

[0011] Furthermore, to better implement the present invention, the following setting structure is particularly adopted: the valve includes a driving member, a plurality of blades, and an outer ring member, an inner ring member, and a mounting ring coaxially arranged; the inner ring member is rotatably arranged inside the outer ring member, the mounting ring is fixedly connected to the outer ring member, and the outer ring member is fixedly connected to the ventilation frame; each blade straddles the inner through hole of the inner ring member, the first end of each blade is movably connected to the inner ring member and can move radially along the inner ring member, the second end of each blade is hinged to the mounting ring, and all the blades are sequentially arranged along the circumference of the inner ring member to form a through hole that can be contracted or expanded; the driving member is connected to the inner ring member, and by driving the driving member, the inner ring member can be driven to rotate around its axis, so as to drive the second end of the blade to rotate around its hinge point with the mounting ring, so that all the blades contract or expand in a sequentially staggered form the through hole formed by all the blades to adjust the opening size of the first ventilation hole.

[0012] Furthermore, to better implement the present invention, the following setting structure is particularly adopted: it further includes an aroma diffuser box, the aroma diffuser box is connected to the ventilation frame, the valve is detachably connected to the aroma diffuser box, and a space for placing aromatherapy is formed between the valve and the aroma diffuser box.

[0013] When the above setting structure is adopted, the setting of the aroma diffuser box enables the noise reducer to have the function of placing aromatherapy.

[0014] The present invention also provides a hair dryer, which includes a hair dryer barrel, a motor arranged inside the hair dryer barrel, and the above-mentioned noise reducer, and the noise reducer is connected to the tail of the hair dryer barrel.

[0015] When the above-mentioned setting structure is adopted, the noise reducer is located at the tail of the air duct, so that the aromatherapy in the aromatherapy box can be set on the air inlet side of the hair dryer, which can avoid being affected by high temperature when set on the air outlet side and improve the service life of the aromatherapy.

[0016] Further, to better implement the present invention, the following setting structure is particularly adopted: on the peripheral wall of the air duct, a side air inlet is arranged at a position in front of the noise reducer.

[0017] When the above-mentioned setting structure is adopted, the side air inlet arranged on the peripheral wall of the air duct can ensure that the hair dryer has sufficient air volume during noise reduction, so that the ventilation holes on the ventilation frame can be set smaller, ensuring a better noise reduction effect.

[0018] Further, to better implement the present invention, the following setting structure is particularly adopted: on the peripheral wall of the air duct, a front air inlet is arranged at a position in front of the side air inlet, and the front air inlet extends along the front-back direction of the air duct.

[0019] When the above-mentioned setting structure is adopted, the front air inlet on the peripheral wall of the air duct can ensure that the hair dryer has sufficient air volume during noise reduction, so that the ventilation holes on the ventilation frame can be set smaller, ensuring a better noise reduction effect. At the same time, the front air inlet extending along the front-back direction of the air duct can have a good hidden effect on the air duct, and can have sufficient air intake volume while ensuring a good appearance of the hair dryer.

[0020] Further, to better implement the present invention, the following setting structure is particularly adopted: the front air inlets are arranged on both the left and right sides of the air duct.

[0021] Further, to better implement the present invention, the following setting structure is particularly adopted: the front air inlet is arranged closer to the rear of the air duct than the motor.

[0022] When the above-mentioned setting structure is adopted, the air inlet channels on the hair dryer are all located behind the motor, which can achieve a better noise reduction effect.

[0023] Further, to better implement the present invention, the following setting structure is particularly adopted: a filter screen for filtering air is arranged in the air duct behind the motor.

[0024] The present invention has the following advantages and beneficial effects:

[0025] In the present invention, a valve is combined with a ventilation frame. By opening and closing the valve, the size of the first ventilation holes of the ventilation frame can be adjusted. Therefore, this kind of noise reducer can adjust the ventilation area of the entire ventilation frame by adjusting the opening degree of the first ventilation holes, and thereby change the passing area of the noise, so that the noise is more blocked and reflected before passing through, achieving the purpose of noise reduction, and enabling the noise of the hair dryer to be further reduced on the existing basis. The setting of the second ventilation holes can ensure the most basic air intake of the hair dryer when the noise reducer reduces noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 Shows the rear structure of the hair dryer;

[0028] Figure 2 Is a top view of the hair dryer;

[0029] Figure 3 Is a schematic structural diagram of the ventilation frame;

[0030] Figure 4 Is a schematic structural diagram of the valve;

[0031] Figure 5 Shows the installation structure of the inner ring member and all the blades;

[0032] Figure 6 Shows the structure when only two blades are installed on the inner ring member;

[0033] Figure 7 Is a schematic structural diagram of the aromatherapy box;

[0034] Figure 8 Shows the internal layout diagram of the air duct;

[0035] Figure 9 Shows the front structure of the hair dryer (the outline of the front air inlet in the figure is represented by a thick solid line).

[0036] The labels in the figure are:

[0037] 1. Noise reducer;

[0038] 11. Ventilation frame; 111. First ventilation hole; 112. Second ventilation hole; 113. Bracket;

[0039] 12. Valve; 121. Outer ring member; 122. Inner ring member; 122a. Through groove; 123. Driving member; 124. Mounting ring; 125. Blade; 125a. Cylindrical slider; 125b. Pin shaft

[0040] 13. Aroma diffuser box; 131. Aroma mounting bracket

[0041] 2. Air duct; 21. Side air inlet; 22. Front air inlet

[0042] 3. Motor

[0043] 4. Filter Detailed implementation mode

[0044] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts shall fall within the scope protected by the present invention

[0045] In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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 construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance

[0046] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" 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 mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. 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

[0047] Embodiment 1:

[0048] A noise reducer that can make the noise of the air outlet fan relatively low, such as Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7As shown, it is specifically configured into the following structure:

[0049] In this embodiment, this kind of noise reducer 1 is used for a hair dryer and is mainly installed at the tail of the air duct 2 of the hair dryer for use to adjust the ventilation area at the tail of the air duct 2.

[0050] As Figure 1 shown, the noise reducer 1 includes a ventilation frame 11 and a valve 12. The valve 12 is connected to the ventilation frame 11 to form a component and is installed at the tail of the air duct 2.

[0051] As Figure 3 shown, the ventilation frame 11 is an approximately circular frame that matches the shape of the tail of the air duct 2. On the frame surface of the ventilation frame 11, there are first ventilation holes 111 and second ventilation holes 112 that penetrate along its thickness direction. The first ventilation holes 111 are located at the central position of the ventilation frame 11, and the second ventilation holes 112 are located on the periphery of the first ventilation holes 111 and are arranged equidistantly in sequence around the circumference of the first ventilation holes 111 in a plurality of U-shaped second ventilation holes 112. Inside the first ventilation holes 111, there is a support 113 for installing the valve 12. The outer frame of the ventilation frame 11 is provided with a clamping structure for connecting with the air duct 2.

[0052] In this embodiment, as Figure 1 shown, the valve 12 is arranged at one end of the first ventilation holes 111. The valve 12 is connected to the inner frame forming the first ventilation holes 111 to achieve sealing, so that air will not pass through the joint between the valve 12 and the first ventilation holes 111 to ensure the noise reduction effect. The second ventilation holes 112 are located at the position between the outer frame of the ventilation frame 11 and the outside of the valve 12 and are not blocked by the valve 12 to ensure good ventilation.

[0053] In this embodiment, the valve 12 draws on the structure of a camera shutter to adjust the opening degree of the first ventilation holes 111 for the purpose of stepless adjustment.

[0054] Specifically, as Figures 4 - 6 shown, the valve 12 is mainly composed of an outer ring part 121 made of aluminum alloy, an inner ring part 122 made of aluminum alloy, a driving part 123, an installation ring 124 made of aluminum alloy, and blades 125 made of stainless steel. The outer ring part 121, the inner ring part 122, and the installation ring 124 are coaxially arranged. The inner ring part 122 is integrally arranged in the inner through hole of the outer ring part 121. The installation ring 124 is detachably fixedly installed on one end face of the outer ring part 121 and cooperates with the outer ring part 121 to limit the inner ring part 122 within the outer ring part 121. The inner ring part 122 can freely rotate around its axis within the outer ring part 121.

[0055] Refer to Figure 4 and Figure 6A driver 123, a 304 stainless steel bolt, is fixedly connected to the outer circumference of the inner ring 122. The distal end of the driver 123 extends from a circumferentially extending operating hole on the outer circumference of the outer ring 121 to the outside of the outer ring 121 for manual operation by the user. Twelve radially extending through slots 122a are equidistantly spaced along the circumference of one end surface of the inner ring 122. Each of the through slots 122a houses a cylindrical slider 125a that is movable along the slots 122a. The first end of the blade 125 is connected to a cylindrical slider 125a through a golden pure copper rivet so that it can move radially along the inner ring 122. The blade 125 spans the inner through hole of the inner ring 122. The second end of the blade 125 is connected to a pin shaft 125b extending along the axis of the inner ring 122. The pin shaft 125b can be rotatably inserted into the pin hole provided on the mounting ring 124 to hinge the second end of the blade 125 to the mounting ring 124; the 12 blades 125 correspond one-to-one to the 12 through grooves 122a and the 12 pin holes and are staggered in sequence along the circumference of the inner ring 122. All the blades 125 form a contractible or expandable through hole at their center position.

[0056] Two protrusions are provided on the wall of the operating hole, located midway between them. These protrusions are arranged sequentially along the circumference of the outer ring 121. When the driver 123 reaches a protrusion, it can be slightly blocked to increase the driving force before passing over it. When the driver 123 passes over a protrusion and lies between two protrusions, it can be better maintained between the two protrusions without moving, thereby keeping the blades 125 of the valve 12 in a semi-open state, and the through-holes formed by all the blades 125 in a semi-open state.

[0057] The valve 12 can adjust the opening size of the first ventilation hole 111 to adjust the ventilation area of the ventilation frame 11. Specifically, during adjustment, the inner ring member 122 can be driven to rotate around its axis by manually moving the driving member 123 along the direction of the operating hole, so as to drive the second end of the blade 125 to rotate around the hinge point with the mounting ring 124, so that all the blades 125 can shrink or expand the through hole formed by all the blades 125 in a staggered manner in sequence to adjust the opening size of the first ventilation hole 111.

[0058] Of course, the valve 12 may also be a common product that can control the opening of the first ventilation hole 111, such as a gate, a plug, a ball valve, etc.

[0059] In this embodiment, the outer ring 121 is directly connected and fixed to the ventilation frame 11 .

[0060] In this embodiment, the valve 12 is combined with the ventilation frame 11. The size of the first ventilation hole 111 of the ventilation frame 11 can be adjusted by opening and closing the valve 12. Therefore, this noise reducer can adjust the ventilation area of the entire ventilation frame 11 by adjusting the opening of the first ventilation hole 111. This can change the passage area of the noise, so that the noise is more blocked and reflected before passing through, and absorbed by the structural material, thereby achieving the purpose of noise reduction. The provision of the second ventilation hole 112 can ensure that the noise reducer guarantees the minimum air intake volume of the hair dryer when reducing noise. The first ventilation hole 111 is located on the inner side of the ventilation frame 11 compared to the second ventilation hole 112, so that the valve 12 can be set close to the center of the ventilation frame 11, so that when reducing noise, more noise can pass through the ventilation holes located on the outer side of the ventilation frame 11, making the noise passing through various parts of the ventilation frame 11 more consistent.

[0061] When the first vent 111 of the valve 12 is fully opened, more air can enter the air intake of the motor 3 of the hair dryer, thereby ensuring sufficient air output from the motor 3. However, there is usually an upper limit to the air intake requirements of different models of motors 3. Through experiments, we have found that as long as the air intake of the motor 3 is sufficient, sufficient air output can be obtained without fully opening the first vent 111 of the valve 12. Even if the opening of the first vent 111 is increased, the effect on the air volume blown out by the hair dryer is limited. However, a wider opening of the first vent 111 will allow more noise to be directly transmitted. Therefore, when selecting a motor 3, it is generally necessary to meet the requirement of reaching the maximum air output when the first vent 111 is not fully opened, so as to consider a certain noise reduction effect while also achieving the maximum air output.

[0062] Example 2:

[0063] This embodiment is a further optimization based on the above embodiment. To better implement the present invention, the following configuration structure is particularly adopted:

[0064] In this embodiment, the noise reducer 1 has the function of installing an aromatherapy device.

[0065] Specifically, the noise reducer 1 further includes an aromatherapy box 13 based on the embodiment 1.

[0066] like Figure 7 As shown, the aromatherapy box 13 has a through hole in the center, an aromatherapy mounting frame 131 is provided in the through hole, and a plug is provided on one side of the aromatherapy mounting frame 131 to align with the socket provided on the bracket 113 .

[0067] The aromatherapy box 13 is detachably mounted on the ventilation frame 11 by inserting a plug into the socket.

[0068] On the inner side wall of the aromatherapy box 13, there are protrusions provided. On the outer circular surface of the outer ring member 121, there are clamping grooves that cooperate with the protrusions in addition to the operation holes. The aromatherapy box 13 is inserted into the clamping grooves through the protrusions, so that the valve 12 is detachably fixed inside the aromatherapy box 13. After the aromatherapy box 13 and the valve 12 are assembled, in the axial direction, a space for placing aromatherapy is formed between the valve 12 and the aromatherapy box 13, and the aromatherapy mounting rack 131 is located in this space. When it is necessary to place aromatherapy, it is only necessary to remove the valve 12, place the aromatherapy on the aromatherapy mounting rack 131, and then install the valve 12, or adjust the opening degree of the valve 12 to the maximum and then put in an aromatherapy sheet of a suitable size.

[0069] In this embodiment, the setting of the aromatherapy box 13 enables the noise reducer to have the function of placing aromatherapy. Moreover, the aromatherapy sheet located at the rear end of the air duct 2 will not block the air flow of the outgoing air and will not affect the hair drying efficiency of the hair dryer.

[0070] As an optimal implementation manner of this embodiment, the valve 12 has a minimum opening degree. At the minimum opening degree, all the blades 125 will maintain a through hole with a diameter of 1.5 mm, so that the perfume in the aromatherapy can be brought into the air duct 2 by a small amount of air flow passing through the through hole with a diameter of 1.5 mm, so as to provide an aromatherapy air flow while ensuring a good noise reduction effect. Of course, when the valve 12 is at the minimum opening degree, the diameter of the through hole formed by all the blades 125 can also be other sizes such as 1.6 mm or 1.4 mm.

[0071] Embodiment 3:

[0072] On the basis of any of the above embodiments, this embodiment further provides a hair dryer, especially adopting the following setting structure:

[0073] As shown in Figures 1 - 9 In this embodiment, this kind of hair dryer includes an air duct 2, a motor 3 arranged in the air duct 2, and the noise reducer 1 in any of the above embodiments. A handle is integrally formed on the air duct 2. The noise reducer 1 is detachably and fixedly connected to the tail of the air duct 2 through a clamping structure arranged on the outer frame of the ventilation frame 11. The valve 12 in the noise reducer 1 is centered at the ventilation opening at the tail of the air duct 2. When the noise reducer 1 in Embodiment 2 is adopted, since the noise reducer 1 is located at the tail of the air duct 2, the aromatherapy in the aromatherapy box 13 is located at the tail of the air duct 2, so that the aromatherapy can be arranged on the air inlet side of the hair dryer, which can avoid being affected by high temperature when arranged on the air outlet side and improve the service life of the aromatherapy.

[0074] A filter screen 4 is arranged in the air duct 2. The filter screen 4 is located behind the motor 3 and is used to filter the air that will pass through the motor 3.

[0075] When operating the noise reducer 1, if the through holes formed by contracting all the blades 125 can reduce noise, the air volume will be affected to a certain extent. Subsequently, when expanding the through holes formed by all the blades 125, the air volume will increase, but the noise will also increase.

[0076] Embodiment 4:

[0077] This embodiment is further optimized on the basis of the above embodiments. In order to better implement the present invention, the following setting structure is particularly adopted:

[0078] In this embodiment, the hair dryer is provided with additional ventilation openings on the peripheral wall of the air duct 2.

[0079] As Figure 1 、 Figure 2 、 Figure 8 and Figure 9 shown, side air inlets 21 are symmetrically arranged on the left and right sides of the peripheral wall of the air duct 2. At the same time, a wind screen for decorating the side air inlets 21 is installed on the peripheral wall of the air duct 2. The side air inlets 21 are integrally located at the front side of the noise reducer 1.

[0080] As Figure 2 and Figure 9 shown, front air inlets 22 are symmetrically arranged on the left and right sides of the peripheral wall of the air duct 2. The front air inlets 22 extend along the front-back direction of the air duct 2 so that the air flow enters the air duct 2 from the front to the back and then turns. The front air inlets 22 are formed at the groove steps provided on the peripheral wall of the air duct 2 for easy hiding. The front air inlets 22 are integrally located at the front side of the side air inlets 21, so that there are three ventilation openings arranged on the air duct 2 from front to back.

[0081] As Figure 8 and Figure 9 shown, the front air inlets 22 are arranged closer to the rear of the air duct 2 than the motor 3. The ventilation openings for air intake on the hair dryer are all located behind the motor 3, so that a better noise reduction effect can be achieved.

[0082] In this embodiment, the side air inlets 21 and the front air inlets 22 provided on the peripheral wall of the air duct 2 can allow air to enter the air duct 2 and then turn into the suction port of the motor 3, and will not be blocked by the noise reducer 1 to reduce the air output of the hair dryer. It can ensure that the hair dryer has sufficient air volume during noise reduction, so that the heat can be quickly carried out by sufficient air volume to ensure the drying effect. At the same time, the setting of the side air inlets 21 and the front air inlets 22 can make the ventilation holes on the ventilation frame 11 smaller while ensuring the air volume, ensuring a better noise reduction effect. At the same time, the front air inlets 22 extending along the front-back direction of the air duct 2 can have a good hiding effect on the air duct 2, and can have sufficient air intake while ensuring a good appearance of the hair dryer.

[0083] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention.

Claims

1. A noise reducer, characterized in that: Comprising: A ventilation frame (11), on the frame surface of the ventilation frame (11), a first ventilation hole (111) and a second ventilation hole (112) are provided; A valve (12), the valve (12) is arranged at one end of the first ventilation hole (111), and the valve (12) can adjust the opening degree of the first ventilation hole (111) to adjust the ventilation area of the ventilation frame (11); The valve (12) comprises a driving member (123), a plurality of blades (125), and an outer ring member (121), an inner ring member (122), and a mounting ring (124) arranged coaxially; The inner ring member (122) is rotatably arranged inside the outer ring member (121), the mounting ring (124) is fixedly connected to the outer ring member (121), and the outer ring member (121) is fixedly connected to the ventilation frame (11); Each of the blades (125) straddles the inner through hole of the inner ring member (122), the first end of each blade (125) is movably connected to the inner ring member (122) and can move radially along the inner ring member (122), the second end of each blade (125) is hinged to the mounting ring (124), and all the blades (125) are sequentially arranged along the circumferential direction of the inner ring member (122) to form a through hole that can be contracted or expanded; The driving member (123) is connected to the inner ring member (122), and by driving the driving member (123), the inner ring member (122) can be driven to rotate around its axis, so as to drive the second end of the blade (125) to rotate around its hinge point with the mounting ring (124), so that all the blades (125) contract or expand in a sequentially staggered form the through hole formed by all the blades (125) to adjust the opening degree of the first ventilation hole (111).

2. The noise reducer according to claim 1, wherein: The first ventilation hole (111) and the second ventilation hole (112) are sequentially arranged from the inside to the outside on the frame surface of the ventilation frame (11), and the second ventilation hole (112) is located at the position between the outer frame of the ventilation frame (11) and the outside of the valve (12).

3. A noise reducer according to claim 1, characterized in that: The first ventilation hole (111) is arranged at the center of the frame surface of the ventilation frame (11), and a plurality of the second ventilation holes (112) are sequentially arranged around the circumference of the first ventilation hole (111).

4. A noise reducer according to claim 1, characterized in that: It further comprises an aromatherapy box (13), the aromatherapy box (13) is connected to the ventilation frame (11), the valve (12) is detachably connected to the aromatherapy box (13), and a space capable of placing aromatherapy is formed between the valve (12) and the aromatherapy box (13).

5. A hair dryer, characterized in that: Comprising a wind tube (2), a motor (3) arranged inside the wind tube (2), and the noise reducer (1) according to any one of claims 1-4, the noise reducer (1) is connected to the tail of the wind tube (2).

6. The hair dryer according to claim 5, wherein: On the peripheral wall of the wind tube (2), a side air inlet (21) is arranged at the front side position of the noise reducer (1).

7. The hair dryer according to claim 6, characterized in that: On the peripheral wall of the air duct (2), an air inlet (22) is provided at the front side position of the side air inlet (21), and the air inlet (22) extends along the front-back direction of the air duct (2).

8. A hair dryer according to claim 7, characterized in that: The air inlet (22) is provided on both the left and right sides of the air duct (2).

9. The hair dryer according to claim 7, characterized in that: The air inlet (22) is arranged closer to the rear of the air duct (2) than the motor (3).

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