Low-noise hair drier

Abstract

The utility model discloses a low-noise hair drier, which belongs to the technical field of household appliances, solves the problem of poor noise reduction effect, and adopts the technical scheme that the low-noise hair drier mainly comprises a casing, a motor arranged in the casing, fan blades and side air inlet holes formed in the peripheral side surface of the rear end of the casing, a middle support is arranged in the machine shell and fixedly arranged on the periphery of the installation support in a sleeving mode, a first ventilation hole is formed in the circumferential side face of the middle support, an outer sound absorption layer is arranged between the middle support and the machine shell and located on the inner side of the side air inlet hole and the outer side of the first ventilation hole, and a second ventilation hole is formed in the circumferential side face of the installation support. An inner sound absorption layer is arranged between the installation support and the middle support and blocks the inner sides of the first ventilation holes and the outer sides of the second ventilation holes, the hole diameter of the first ventilation holes is smaller than that of the side air inlet holes, and the hole diameter of the second ventilation holes is larger than that of the first ventilation holes. The noise reduction effect of the blower is mainly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to a low-noise hair dryer. Background Art

[0002] A hair dryer is a small personal care appliance used to quickly dry hair. It can also be used to dry items that require quick drying. It consists of a fan unit and a heating element. Airflow enters the device through the fan unit, where it is heated by the heating element and then discharged, quickly drying hair. However, the fan unit generates air flow, and this airflow impinges on the fan unit or the body of the device, generating noise.

[0003] Prior art CN116849442A discloses a method for controlling the constant temperature of a hair dryer, wherein the hair dryer comprises an air outlet and a handle, wherein the air outlet comprises an air outlet, a blower, an air inlet 1, and a temperature sensing mechanism, wherein the temperature sensing mechanism is mounted on one end of the air outlet of the hair dryer near the air outlet, wherein the temperature sensing mechanism comprises a sensor and a sensor lens, wherein the blower is mounted inside the air outlet of the hair dryer near the air inlet 1, wherein a heating wire is mounted on the end of the air outlet of the hair dryer near the air outlet, wherein a circuit board is mounted inside the handle, wherein a filter mechanism is mounted on the surface of the air inlet, wherein the filter mechanism comprises a primary filter plate, a secondary filter plate, and a tertiary filter plate, wherein the tertiary filter plate is mounted on one side of the blower and covers one end of the blower, wherein a micro-perforated plate is arranged around the surface of the tertiary filter plate, wherein the secondary filter plate is mounted on the inner wall of the opening of the air inlet 1 and covers the surface of the micro-perforated plate, wherein the primary filter plate covers the opening of the air inlet 1, and wherein a muffler cavity is disposed between the outer wall of the micro-perforated plate and the inner wall of the air outlet of the hair dryer. By setting up a multi-stage filtering mechanism at the air inlet, the fan can avoid sucking hair directly onto the fan blades during the suction process, which may cause danger. Adding a three-stage filter can effectively prevent hair from being drawn into the inside of the fan and causing danger. By setting a micro-perforated plate on the outside of the three-stage filter and a silencer cavity on the outside of the micro-perforated plate, noise reduction cotton can be added to effectively reduce noise.

[0004] In the prior art, when reducing noise, the hair dryer is arranged by setting a micro-perforated plate on the outside of the three-stage filter, and then setting a silencer cavity on the outside of the micro-perforated plate and adding noise-reducing cotton. The silencer cavity and the noise-reducing cotton are located at the very end of the air inlet. During the use of the hair dryer, the main source of noise is the aerodynamic noise generated by the motor bearings and the fan blades. The silencer cavity on the outside of the micro-perforated plate and the added noise-reducing cotton can only reduce the noise generated by the airflow entering the air inlet, and the overall noise reduction effect is poor. Utility Model Content

[0005] The purpose to be achieved by the utility model is to provide a low-noise hair dryer, solve the problem of poor noise reduction effect, and improve the noise reduction effect of the hair dryer.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a low-noise hair dryer, comprising a casing, a motor arranged in the casing, a fan blade and a side air inlet arranged on the outer peripheral side of the rear end of the casing, the motor drives the fan blade to make air flow into the casing through the side air inlet, a mounting bracket is provided behind the motor, an intermediate bracket is provided in the casing, the intermediate bracket is fixed on the outer periphery of the mounting bracket, a first ventilation hole is provided on the circumferential side of the intermediate bracket, an outer sound-absorbing layer is provided between the intermediate bracket and the casing, the outer sound-absorbing layer is located on the inner side of the side air inlet and on the outer side of the first ventilation hole, a second ventilation hole is provided on the circumferential side of the mounting bracket, an inner sound-absorbing layer is provided between the mounting bracket and the intermediate bracket, the inner sound-absorbing layer blocks the inner side of the first ventilation hole and the outer side of the second ventilation hole, the aperture of the first ventilation hole is smaller than the aperture of the side air inlet, and the aperture of the second ventilation hole is larger than the aperture of the first ventilation hole.

[0007] After adopting the above technical solution, the utility model has the following advantages: when the hair dryer is used, the motor drives the fan blades to rotate. When the fan blades rotate, the outside air enters the casing from the side air inlet. When the air entering the casing passes through the outer sound-absorbing layer, the outer sound-absorbing layer absorbs the noise generated by the entering air, thereby preliminarily reducing the noise. After the air passes through the outer sound-absorbing layer, it enters the middle bracket from the first ventilation hole on the middle bracket. The air entering the casing all passes through the outer sound-absorbing layer, reducing the possibility of large noise generated in the process of air entering the casing. The outer sound-absorbing layer absorbs noise energy while filtering impurities in the air, reducing the possibility of impurities in the air entering the casing from the side air inlet, causing greater risks in the use of the hair dryer. The air entering the middle bracket enters the mounting bracket from the second ventilation hole on the mounting bracket. The inner sound-absorbing layer reduces the noise of the air about to enter the second ventilation hole between the first ventilation hole and the second ventilation hole, thereby reducing the noise generated by the air entering the mounting bracket. In addition, the aperture of the first ventilation hole is set to be smaller than the aperture of the side air inlet hole, and the aperture of the second ventilation hole is set to be larger than the aperture of the first ventilation hole, so that a double-layer micro-perforated sound-absorbing body is formed between the inner sound-absorbing layer, the first ventilation hole and the outer sound-absorbing layer, thereby widening the sound absorption frequency of the inner sound-absorbing layer and the outer sound-absorbing layer, and further enhancing the noise reduction effect.

[0008] Furthermore, the total area of the second ventilation holes is S1, the circumferential side area of the inner sound-absorbing layer is S2, and S1 / S2=0.5-0.9.

[0009] By adopting the above-mentioned technical solution, by setting the ratio of the total area of the second ventilation holes to the circumferential side area of the inner sound-absorbing layer to 0.5-0.9, the total area of the second ventilation holes is set as large as possible while the inner sound-absorbing layer can completely cover the second ventilation holes, thereby increasing the contact area of the inner sound-absorbing layer with the noise and improving the sound absorption effect of the inner sound-absorbing layer.

[0010] Furthermore, the second ventilation hole is a rectangular hole, and the length direction of the second ventilation hole extends along the circumference of the mounting bracket.

[0011] By adopting the above-mentioned technical solution, the air passing through the inner sound-absorbing layer enters the fan blade from the second ventilation hole. The second ventilation hole is set as a rectangular hole and the length direction extends along the circumference of the mounting bracket. This does not affect the entry of air while avoiding the reduction of the strength of the mounting bracket, making it easier for the inner sound-absorbing layer to absorb the energy of the generated noise.

[0012] Furthermore, the intermediate bracket includes an end portion and a side portion, the end portion is located at the rear end of the side portion, the side portion is sleeved on the outer periphery of the mounting bracket, the front end of the side portion is fixed on the mounting bracket, and the first ventilation hole is provided on the side portion.

[0013] Using the aforementioned technical solution, when installing the intermediate bracket, the front end of the side portion is fixed to the mounting bracket, and the first ventilation hole is provided on the side portion. This facilitates connection between the mounting bracket and the intermediate bracket while not affecting the air intake of the first ventilation hole, thereby not affecting the use of the hair dryer. The end portion can also support the side portion, improving the structural stability of the intermediate bracket.

[0014] Furthermore, the intermediate bracket is a filter screen, and a plurality of support ribs are formed at the rear end of the mounting bracket. The support ribs are used to support the sides and ends of the intermediate bracket, and hollow holes for ventilation are formed between adjacent support ribs.

[0015] Using the above-mentioned technical solution, since the filter is a thin-walled structure, when installing the intermediate bracket, the intermediate bracket support is placed on the support ribs to ensure the stability of the filter structure and reduce the possibility of the intermediate bracket detaching from the installation bracket. By forming hollow through holes in adjacent support ribs, the influence of the support ribs on the airflow is reduced.

[0016] Furthermore, a rear air inlet is provided on the rear end surface of the casing, and a third ventilation hole for rear air intake is provided at the end of the middle bracket.

[0017] By adopting the above-mentioned technical solution, when the hair dryer is in use, air is taken in by the side air inlet and the rear air inlet at the same time, thereby improving the air intake efficiency of the hair dryer. The air entering from the rear air inlet enters between the mounting bracket and the middle bracket through the third ventilation hole, and the air intake is smooth.

[0018] Furthermore, the diameter of the first ventilation hole is 0.1 mm to 0.5 mm.

[0019] By adopting the above-mentioned technical solution, by setting the aperture of the first ventilation hole to 0.1mm~0.5mm, the aperture of the first ventilation hole is made smaller, which facilitates the first ventilation hole to form a double-layer micro-perforated sound absorber with the inner sound absorbing layer and the outer sound absorbing layer, widens the sound absorption frequency, and improves the noise reduction effect of the inner sound absorbing layer and the outer sound absorbing layer.

[0020] Furthermore, the thickness of the outer sound-absorbing layer is not less than 3 mm.

[0021] By adopting the above-mentioned technical solution, the thickness of the outer sound-absorbing layer is set to no less than 3mm, ensuring the sound-absorbing effect of the outer sound-absorbing layer and ensuring the strength of the outer sound-absorbing layer, reducing the possibility that the strength of the outer sound-absorbing layer is too low and affects the service life of the hair dryer.

[0022] Furthermore, the mounting bracket is provided with a positioning groove on the outer side of the second ventilation hole, and the inner sound-absorbing layer is provided in the positioning groove and protrudes out of the positioning groove.

[0023] By adopting the above technical solution, a positioning groove is set on the outer side of the second ventilation hole of the mounting bracket, and the inner sound-absorbing layer is set in the positioning groove in a protruding form, which facilitates the installation and positioning of the inner sound-absorbing layer, reduces the possibility of the inner sound-absorbing layer detaching from the mounting bracket, and ensures the noise reduction effect of long-term use.

[0024] Furthermore, the inner sound-absorbing layer is made of polyester fiber, glass fiber, rock wool, foam plastic, polyurethane foam or wool felt; and / or the outer sound-absorbing layer is made of polyurethane foam or glass fiber.

[0025] Using the above-mentioned technical solution, the inner sound-absorbing layer can be made of polyester fiber, glass fiber, rock wool, foam plastic, polyurethane foam or wool felt, and the outer sound-absorbing layer is made of polyurethane foam or glass fiber, ensuring the noise reduction effect of the inner and outer sound-absorbing layers, and reducing the possibility of excessive noise transmitted to the outside during the use of the hair dryer. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings:

[0027] Figure 1 This is an overall schematic diagram of a low-noise hair dryer of the utility model;

[0028] Figure 2 This is a schematic diagram of the installation of the inner sound-absorbing layer and the outer sound-absorbing layer in the present invention;

[0029] Figure 3 For this utility model Figure 2 Enlarged view of point A in the middle;

[0030] Figure 4 This is an exploded schematic diagram of the mounting bracket and the intermediate bracket in the present utility model;

[0031] Figure 5 This is an exploded schematic diagram of the support ribs and the intermediate bracket in the utility model. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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.

[0033] The terms "first," "second," and so on (if any) in the specification and claims of this utility model are used to distinguish similar objects, not to describe a specific order or precedence. Even if "second" is used before a technical feature to distinguish it, it does not necessarily imply the presence of "first." It should be understood that in this utility model, "including," "having," and any variations thereof are intended to cover non-exclusive inclusions. It should be understood that in this utility model, "plurality" refers to two or more. "And / or" is merely a description of an association between related objects, indicating that three relationships can exist. For example, "X and / or Y" can mean: X exists alone, X and Y exist simultaneously, or Y exists alone. The character " / " generally indicates that the related objects are in an "or" relationship. "Including X, Y, and Z" means that all three of X, Y, and Z are included. "Including X, Y, or Z" means that one of X, Y, and Z is included. "Including X, Y, and / or Z" means that any one, any two, or any three of X, Y, and Z are included.

[0034] The following specific embodiments are used to describe the technical solution of the present invention in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0035] like Figure 1 and Figure 2 As shown, the utility model provides a low-noise hair dryer, comprising a casing 1, a motor 2 arranged in the casing 1, a fan blade 3 and a side air inlet 11 arranged on the outer peripheral side of the rear end of the casing 1. The motor 2 drives the fan blade 3 to allow air to enter the casing 1 through the side air inlet 11. When the hair dryer is used, the motor 2 is started, and the motor 2 drives the fan blade 3 to rotate. During the rotation of the fan blade 3, the air on the outer side of the rear end of the casing 1 enters the interior of the casing 1 from the side air inlet 11, and is blown out driven by the fan blade 3 for drying.

[0036] In this embodiment, if Figure 2 、 Figure 3 and Figure 4As shown, a mounting bracket 4 is provided behind the motor 2, and an intermediate bracket 5 is provided within the housing 1. The intermediate bracket 5 is secured around the outer periphery of the mounting bracket 4. A first ventilation hole 521 is provided on the circumferential side of the intermediate bracket 5. An outer sound-absorbing layer 6 is provided between the intermediate bracket 5 and the housing 1. The outer sound-absorbing layer 6 is located inside the side air inlet 11 and outside the first ventilation hole 521. The outer sound-absorbing layer 6 absorbs noise energy generated by air entering through the side air inlet 11, reducing the possibility of excessive noise being transmitted during use. The outer sound-absorbing layer 6 also filters impurities in the air, reducing the possibility of impurities entering the housing 1 and affecting the service life of the hair dryer. A second ventilation hole 41 is provided on the circumferential side of the mounting bracket 4. An inner sound-absorbing layer 7 is provided between the mounting bracket 4 and the intermediate bracket 5. The inner sound-absorbing layer 7 blocks the inside of the first ventilation hole 521 and outside of the second ventilation hole 41. The inner sound-absorbing layer 7 absorbs noise energy generated by air passing through the first ventilation hole 521 and the second ventilation hole 41, reducing the possibility of excessive noise being transmitted during use of the hair dryer. The aperture of the first ventilation hole 521 is smaller than that of the side air inlet hole 11, and the aperture of the second ventilation hole 41 is larger than that of the first ventilation hole 521, so that a double-layer micro-perforated sound-absorbing body is formed between the inner sound-absorbing layer 7, the first ventilation hole 521 and the outer sound-absorbing layer 6, thereby widening the sound absorption band and improving the noise reduction effect, thereby reducing the possibility of excessive noise being transmitted to the outside during use of the hair dryer.

[0037] like Figure 4 As shown, the intermediate bracket 5 includes an end portion 51 and a side portion 52. The end portion 51 is located at the rear end of the side portion 52 and supports the side portion 52, thereby improving the structural stability of the intermediate bracket 5. The side portion 52 is sleeved on the outer periphery of the mounting bracket 4, and the front end of the side portion 52 is fixed on the mounting bracket 4, thereby firmly mounting the intermediate bracket 5 on the mounting bracket 4. The first ventilation hole 521 is provided on the side portion 52. When the intermediate bracket 5 is installed, the side portion 52 is sleeved on the outer periphery of the mounting bracket 4, thereby improving the stability of the intermediate bracket 5.

[0038] In order to avoid the influence of the middle bracket 5 on the air intake of the hair dryer, Figure 5 As shown, the intermediate bracket 5 is configured as a filter. Since the filter is a thin-walled structure, support ribs 43 are formed at the rear end of the mounting bracket 4 to ensure its structural stability. These ribs support the side portions 52 and end portions 51 of the intermediate bracket 5, thereby ensuring structural stability after installation and reducing the possibility of the intermediate bracket 5 detaching from the mounting bracket 4. Ventilation holes 431 are formed between adjacent support ribs 43. After the intermediate bracket 5 is installed on the mounting bracket 4, air enters through the filter and enters the interior of the mounting bracket 4 through the ventilation holes 431 formed between adjacent support ribs 43. These holes 431 reduce the impact of the support ribs 43 on airflow.

[0039] In order to facilitate the air intake of the hair dryer, Figure 2 and Figure 5 As shown, the rear end face of the casing 1 is provided with a rear air inlet 12, and the end 51 of the intermediate bracket 5 is provided with a third ventilation hole 522 for rear air intake. When the motor 2 drives the fan blade 3 to run, in addition to the side air inlet 11 taking in air, the rear air inlet 12 also takes in air, thereby improving the air intake efficiency of the hair dryer. The air entering from the rear air inlet 12 flows into the fan blade 3 from the third ventilation hole 522, and the air intake is smooth.

[0040] To improve the sound absorption effect of the inner sound-absorbing layer 7, the total area of the second ventilation holes 41 is S1, the circumferential side area of the inner sound-absorbing layer 7 is S2, and S1 / S2=0.5-0.9. This ensures that the total area of the second through holes 41 exceeds at least half of the circumferential side area of the inner sound-absorbing layer 7 and can be completely covered by the inner sound-absorbing layer 7, thereby increasing the contact area between the inner sound-absorbing layer 7 and the noise, thereby improving the sound absorption effect of the inner sound-absorbing layer 7.

[0041] like Figure 5 As shown, in order to facilitate ventilation of the second ventilation hole 41, the second ventilation hole 41 is a rectangular hole, and the length direction of the second ventilation hole 41 extends along the circumference of the mounting bracket 4, thereby increasing the circumferential size of the second ventilation hole 41 on the mounting bracket 4, thereby improving the air intake effect of the second ventilation hole 41, and at the same time improving the effect of the inner sound-absorbing layer 7 in absorbing noise energy.

[0042] like Figure 3 As shown, in order to facilitate the outer sound absorbing layer 6, the first ventilation holes 521 and the inner sound absorbing layer 7 to form a double-layer micro-perforated sound absorber, the aperture of the first ventilation hole 521 is 0.1 mm to 0.5 mm, so that the aperture of the first ventilation hole 521 is smaller than that of the first ventilation hole 521 and the second ventilation hole 41, so as to widen the sound absorption band and improve the noise reduction effect.

[0043] like Figure 3 As shown, in order to improve the stability of the installation of the inner sound-absorbing layer 7, the mounting bracket 4 is provided with a positioning groove 42 on the outer side of the second ventilation hole 41. The inner sound-absorbing layer 7 is arranged in the positioning groove 42 and protrudes out of the positioning groove 42, which facilitates the installation and positioning of the inner sound-absorbing layer 7, reduces the possibility of the inner sound-absorbing layer 7 detaching from the mounting bracket 4, and ensures the noise reduction effect during long-term use.

[0044] In this embodiment, inner sound-absorbing layer 7 is made of polyester fiber, glass fiber, rock wool, foam plastic, polyurethane foam, or wool felt, making it relatively soft. Upon contact with second vents 41, the soft inner sound-absorbing layer 7 partially embeds within second vents 41 and extends into mounting bracket 4. This allows inner sound-absorbing layer 7 to absorb not only noise passing through second vents 41 but also noise near the inner wall of mounting bracket 4, thereby enhancing the sound absorption performance of inner sound-absorbing layer 7. Outer sound-absorbing layer 6 is made of polyurethane foam or glass fiber.

[0045] In order to ensure the strength of the outer sound absorbing layer 6, the thickness of the outer sound absorbing layer 6 is not less than 3 mm, ensuring the sound absorption effect of the outer sound absorbing layer 6 and ensuring the strength of the outer sound absorbing layer 6, reducing the possibility that the outer sound absorbing layer 6 affects the service life of the hair dryer due to too low strength.

[0046] In addition to the above-mentioned preferred embodiments, the present invention has other implementation methods. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A low-noise hair dryer, comprising a housing, a motor disposed within the housing, a fan blade, and a side air inlet provided on the outer peripheral side of the rear end of the housing. The motor drives the fan blade to allow air to flow into the housing through the side air inlet. A mounting bracket is provided behind the motor, characterized in that: An intermediate bracket is provided in the casing, and the intermediate bracket is fixed on the outer circumference of the mounting bracket. A first ventilation hole is provided on the circumferential side of the intermediate bracket, and an outer sound-absorbing layer is provided between the intermediate bracket and the casing. The outer sound-absorbing layer is located on the inner side of the side air inlet and the outer side of the first ventilation hole. A second ventilation hole is provided on the circumferential side of the mounting bracket, and an inner sound-absorbing layer is provided between the mounting bracket and the intermediate bracket. The inner sound-absorbing layer blocks the inner side of the first ventilation hole and the outer side of the second ventilation hole. The aperture of the first ventilation hole is smaller than the aperture of the side air inlet, and the aperture of the second ventilation hole is larger than the aperture of the first ventilation hole.

2. The low-noise hair dryer according to claim 1, characterized in that: The total area of the second ventilation holes is S1, the circumferential side area of the inner sound-absorbing layer is S2, and S1 / S2=0.5-0.

9.

3. The low-noise hair dryer according to claim 1, characterized in that: The second ventilation hole is a rectangular hole, and the length direction of the second ventilation hole extends along the circumference of the mounting bracket.

4. The low-noise hair dryer according to claim 1, characterized in that: The intermediate bracket includes an end portion and a side portion, the end portion is located at the rear end of the side portion, the side portion is sleeved on the outer periphery of the mounting bracket, the front end of the side portion is fixed on the mounting bracket, and the first ventilation hole is provided on the side portion.

5. The low-noise hair dryer according to claim 4, characterized in that: The middle bracket is a filter screen, and a plurality of supporting ribs are formed at the rear end of the mounting bracket. The supporting ribs are used to support the sides and ends of the middle bracket, and hollow through holes for ventilation are formed between adjacent supporting ribs.

6. The low-noise hair dryer according to claim 4, characterized in that: The rear end surface of the housing is provided with a rear air inlet, and the end of the middle bracket is provided with a third ventilation hole for rear air intake.

7. The low-noise hair dryer according to claim 1, characterized in that: The diameter of the first ventilation hole is 0.1 mm to 0.5 mm.

8. The low-noise hair dryer according to claim 1, characterized in that: The thickness of the outer sound absorbing layer is not less than 3 mm.

9. The low-noise hair dryer according to claim 1, characterized in that: The mounting bracket is provided with a positioning groove on the outer side of the second ventilation hole, and the inner sound absorbing layer is arranged in the positioning groove and protrudes out of the positioning groove.

10. The low-noise hair dryer according to claim 1, characterized in that: The inner sound-absorbing layer is made of polyester fiber, glass fiber, rock wool, foam plastic, polyurethane foam or wool felt; and / or the outer sound-absorbing layer is made of polyurethane foam or glass fiber.

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