Movable headrest with noise reduction function and automobile seat

Abstract

The utility model provides a movable headrest with a noise reduction function and an automobile seat.The movable headrest comprises a headrest fixing part fixed to a seat headrest rod and a headrest shell arranged outside the headrest fixing part in a sleeving mode and sliding relative to the headrest fixing part, and an inner cavity of the headrest shell is divided into two mounting cavities by the headrest fixing part; the pneumatic driving device is arranged in the mounting cavity and is variable in volume; the pneumatic driving device is communicated with the air source device through the at least two air guide passages; and the flow dividing gas path is connected to the gas guide channel in parallel, and a first flow dividing part and a second flow dividing part are formed in the positions, communicated with the gas guide channel, of the two ends of the flow dividing gas path correspondingly, so that fluctuation of the gas flow is counteracted through flow dividing of the first flow dividing part and confluence of the second flow dividing part, and noise is reduced. According to the movable headrest provided by the invention, the front-back position adjustment can be realized, and the noise can be effectively reduced in the adjustment process.

Description

Technical Field

[0001] The present disclosure generally relates to the technical field of automotive parts, and particularly relates to a movable headrest with a noise reduction function and an automotive seat. Background Art

[0002] In automotive design, the seat headrest plays a crucial role in ensuring the neck safety and comfort of the occupants. The pneumatic driving device of the headrest is introduced as an innovative design to provide more personalized and comfortable head support for the members.

[0003] The pneumatic driving device of the headrest is a structure that supports different positions of the seat headrest by inflating and deflating an airbag, thereby providing different degrees of head support. However, during the inflation and deflation process of the existing pneumatic driving device of the headrest, the high-speed flowing air generates a large abnormal noise, which affects the riding experience of the members. Summary of the Invention

[0004] In view of the above defects or deficiencies in the prior art, it is desirable to provide a movable headrest with a noise reduction function and an automotive seat to solve the above problems.

[0005] The first aspect of the present application provides a movable headrest with a noise reduction function, including a headrest fixing part and a headrest housing. The headrest fixing part is installed at the top of the seat headrest rod, and the headrest housing is sleeved outside the headrest fixing part. The inner cavity of the headrest housing is divided into two installation cavities arranged along a first direction by the headrest fixing part. The headrest housing is slidably connected with the headrest fixing part along the first direction, and further includes:

[0006] A pneumatic driving device, which is arranged in the installation cavity and whose volume changes when inflating and deflating;

[0007] At least two air guiding passages, which are used to connect the pneumatic driving device with a gas source device;

[0008] A shunt air path, which is connected in parallel to the air guiding passage. At least one shunt air path is correspondingly arranged on one air guiding passage. The two ends of the shunt air path are respectively formed with a first shunt part and a second shunt part at the positions where they are connected to the air guiding passage, so that the fluctuations of the air flow are offset by the shunt of the first shunt part and the confluence of the second shunt part, thereby reducing noise.

[0009] According to the technical solution provided by the embodiment of the present application, the air guiding passage extends from the gas source device into the seat headrest rod and penetrates through the seat headrest rod, and extends into the installation cavity to be connected with the pneumatic driving device.

[0010] According to the technical solution provided by the embodiment of the present application, the shunt air path is connected in parallel to the air guide path between the air source device and the seat headrest rod.

[0011] According to the technical solution provided by the embodiment of the present application, the pipe diameter of the shunt air path is 1.25 to 2.5 times the pipe diameter of the air guide path between the two shunt parts.

[0012] According to the technical solution provided by the embodiment of the present application, an air flow frequency adjustment member is connected in series on the shunt air path.

[0013] According to the technical solution provided by the embodiment of the present application, an air flow frequency adjustment member is connected in series on the air guide path, and the shunt air path is arranged inside the air flow frequency adjustment member and is connected in parallel to the air guide path inside the air flow frequency adjustment member.

[0014] According to the technical solution provided by the embodiment of the present application, the air guide path and the shunt air path are connected through a connecting member, and the number of shunt ports for connecting with the shunt air path on the connecting member is set corresponding to the number of shunt air paths connected in parallel on the air guide path.

[0015] According to the technical solution provided by the embodiment of the present application, the shunt air path is in an arc structure or a square structure.

[0016] According to the technical solution provided by the embodiment of the present application, when the number of shunt air paths connected in parallel on the air guide path is greater than or equal to two, adjacent shunt air paths are arranged in a staggered manner along the extending direction of the air guide path.

[0017] The second aspect of the present application provides an automobile seat, including a seat backrest, a seat headrest rod, and a movable headrest with a noise reduction function as described above.

[0018] Compared with the prior art, the beneficial effects of the present application are as follows: The headrest outer shell is slidably connected to the headrest fixing part. The headrest fixing part divides the inner cavity of the headrest outer shell into two installation cavities. Pneumatic driving devices are respectively installed in the two installation cavities. The pneumatic driving devices are connected to the air source device through an air guide path, so that the two pneumatic driving devices are respectively inflated and deflated through the air source device. When the pneumatic driving devices are inflated and deflated, the extrusion with the headrest fixing part and the headrest outer shell drives the headrest outer shell to slide relative to the headrest fixing part, thereby realizing the adjustable position of the headrest; By connecting a shunt air path in parallel on the air guide path, when the pneumatic driving device is inflated and deflated, the air flow in the air guide path is shunted at the first shunt part, and the shunted air flow converges at the second shunt part after passing through the air guide path and the shunt air path. The noise generated by the air flow fluctuation is offset by the shunting at the first shunt part and the confluence at the second shunt part of the air flow fluctuation, so as to reduce the noise generated by the air flow fluctuation and achieve the purpose of improving the riding experience of the occupants. Description of the Drawings

[0019] Other features, objectives, and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0020] Figure 1 Schematic structural diagram of a mobile headrest with noise reduction function provided for Embodiment 1;

[0021] Figure 2 For Figure 1 Schematic cross-sectional structure diagram along the A-A direction at position a in

[0022] Figure 3 For Figure 1 Schematic internal structure diagram of the mobile headrest in

[0023] Figure 4 For Figure 3 Enlarged structural diagram at position b in

[0024] Figure 5 For Figure 1 Exploded view of the mobile headrest shown in

[0025] Figure 6 Schematic diagram of the diameter difference between the air guide passage and the shunt air passage;

[0026] Figure 7 Schematic diagram of a mobile headrest with a square-shaped shunt air passage;

[0027] Figure 8 For Figure 1 Schematic structural diagram of the mobile headrest shown in with an air flow frequency adjustment member added;

[0028] Figure 9 Schematic structural diagram of a mobile headrest with noise reduction function provided for Embodiment 2;

[0029] Figure 10 For Figure 9 Enlarged structural diagram at position c in

[0030] Figure 11 Schematic diagram of the connection between the shunt air passage and the air guide passage in Embodiment 3.

[0031] Reference numerals in the drawings: 1, headrest fixing part; 2, seat headrest rod; 3, headrest housing; 4, pneumatic driving device; 5, air guide passage; 6, shunt air passage; 7, guide column; 8, through hole; 9, guide chute; 10, guide rail; 11, guide rib column; 12, limiting part; 13, non-woven fabric structure; 14, headrest housing cover; 15-1, first shunt part; 15-2, second shunt part; 16, air flow frequency adjustment member; 17, connecting member. Detailed implementation manners

[0032] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention, rather than limiting the invention. Additionally, it should be noted that for the convenience of description, only the parts related to the invention are shown in the drawings.

[0033] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0034] Embodiment 1

[0035] Please refer to Figures 1-8 , this embodiment provides a mobile headrest with a noise reduction function, including a headrest fixing part 1 and a headrest housing 3. The headrest fixing part 1 is installed at the top of the seat headrest rod 2, and the headrest housing 3 is sleeved outside the headrest fixing part 1. The inner cavity of the headrest housing 3 is divided into two installation cavities arranged along a first direction by the headrest fixing part 1. The headrest housing 3 is slidably connected with the headrest fixing part 1 along the first direction, and further includes:

[0036] A pneumatic driving device 4, which is arranged in the installation cavity, and the volume of the pneumatic driving device 4 changes when it is inflated and deflated;

[0037] An air guide passage 5, which connects the pneumatic driving device 4 with a gas source device;

[0038] A shunt air path 6, which is connected in parallel to the air guide passage 5. At least one shunt air path 6 is correspondingly arranged on one air guide passage 5. The positions where the two ends of the shunt air path 6 are connected to the air guide passage 5 respectively form a first shunt part 15-1 and a second shunt part 15-2, so that the fluctuations of the air flow are offset by the shunting of the first shunt part 15-1 and the confluence of the second shunt part 15-2, thereby reducing noise.

[0039] Specifically, as Figure 1 and Figure 3As shown, the seat headrest rod 2 is a U-shaped headrest rod. The seat headrest rod 2 is installed on the seat backrest. The headrest fixing part 1 is provided with a U-shaped fixing hole corresponding to the seat headrest rod 2. The headrest fixing part 1 is connected to the seat headrest rod 2 by inserting the seat headrest rod 2 into the U-shaped fixing hole. The headrest outer shell 3 is sleeved outside the headrest fixing part 1. The headrest outer shell 3 is slidable relative to the headrest fixing part 1, so as to realize the adjustment of the position of the headrest in the front-back direction of the occupant when the occupant is sitting. The headrest fixing part 1 and the headrest outer shell 3 form a seat headrest. The pneumatic driving devices 4 are fixed on the front and rear sides of the headrest fixing part 1 by means of buckles, adhesives or welding. The pneumatic driving devices 4 are made of flexible materials and are hollow inside. The pneumatic driving devices 4 have elasticity. The two pneumatic driving devices 4 are respectively communicated with the air source device through separate air guiding passages 5, so as to realize the inflation and deflation control through the air source device. The air source device is arranged inside the seat backrest. Optionally, the air source device is an air pump, and the pneumatic driving device 4 is an air bag. The headrest outer shell 3 is hollow inside. The headrest fixing part 1 divides the inner cavity of the headrest outer shell 3 into two installation cavities. The two installation cavities are arranged one in front of the other. The two pneumatic driving devices 4 are respectively arranged in the two installation cavities. When the inflation amount of the pneumatic driving device 4 in the front installation cavity is greater than the inflation amount of the pneumatic driving device 4 in the rear installation cavity, the headrest outer shell 3 adjusts its position forward. On the contrary, when the inflation amount of the pneumatic driving device 4 in the rear installation cavity is greater than the inflation amount of the pneumatic driving device 4 in the rear installation cavity, the headrest outer shell 3 adjusts its position backward. The inflation amounts of the two pneumatic driving devices 4 are different, and the position of the headrest outer shell 3 relative to the headrest fixing part 1 is also different. It should be noted that the front-back direction mentioned here is relative to the front-back direction of the vehicle. The front-back direction in the following text is the same, and the left-right direction in the following text is also relative to the left-right direction of the vehicle.

[0040] Since the pneumatic driving device 4 needs to be quickly inflated and deflated when adjusting the position of the headrest outer shell 3, air flow fluctuations are generated when the air flow quickly circulates in the air guiding passage 5, and thus noise will be generated. In this embodiment, a shunt air path 6 is connected in parallel to the air guiding passage 5. The positions where the shunt air path 6 is communicated with the air guiding passage 5 respectively form a first shunt part 15-1 and a second shunt part 15-2. Among them, the side relatively close to the air flow direction is used as the first shunt part 15-1, and the side relatively close to the air flow destination is used as the second shunt part 15-2; as Figure 1 and Figure 3As shown in the figure, taking the example of when air flow enters the pneumatic driving device 4 from the air source device, the air flow is divided at the first shunt part 15-1 when flowing in the air guiding passage 5, and converges at the second shunt part 15-2. The air flow also generates air flow fluctuations when flowing in the shunt air path 6. Since the lengths and pipe diameters of the shunt air path 6 and the air guiding passage 5 are different, the air flow fluctuations generated in the shunt air path 6 and the air guiding passage 5 are different. The purpose of setting the shunt air path 6 is to utilize the differences in air flow fluctuations in the shunt air path 6 and the air guiding passage 5. The air flow fluctuations in the shunt air path 6 and the air guiding passage 5 cancel each other out at the second shunt part 15-2, and by using the principle similar to the Helmholtz effect, the effect of noise reduction is achieved.

[0041] Furthermore, a headrest outer shell cover 14 is formed on the side wall of the headrest outer shell 3, and the headrest outer shell cover 14 is detachably connected to the headrest outer shell 3.

[0042] Specifically, as Figure 2 shown, headrest outer shell covers 14 detachably connected to the headrest outer shell 3 are formed on the front and rear side walls of the headrest outer shell 3. Optionally, mounting holes are provided on the headrest outer shell cover 14, and the headrest outer shell cover 14 and the headrest outer shell 3 are connected by screws.

[0043] Furthermore, the air guiding passage 5 extends from the air source device into the seat headrest rod 2 and penetrates through the seat headrest rod 2, and extends into the headrest outer shell 3 to communicate with the pneumatic driving device 4.

[0044] Specifically, the inside of the seat headrest rod 2 is hollow. One end of the air guiding passage 5 is communicated with the air source device, and the other end extends into the inside of the seat headrest rod 2 from the bottom end of the seat headrest rod 2, and penetrates through the side wall of the seat headrest rod 2 and extends to the installation cavity to communicate with the pneumatic driving device 4, so that the air guiding passage 5 is placed inside the seat headrest rod 2 at the position between the seat backrest and the seat headrest, thereby hiding the air pipe of the air guiding passage 5 and preventing the air pipe of the air guiding passage 5 from being placed outside the seat and affecting the aesthetics. The air pipes of the two air guiding passages 5 extend in through both ends of the seat headrest rod 2 respectively.

[0045] Furthermore, the shunt air path 6 is connected in parallel to the air guiding passage 5 between the air source device and the seat headrest rod 2.

[0046] Specifically, since the internal spaces of the headrest outer shell 3 and the seat headrest rod 2 are limited, the shunt air path 6 is connected in parallel to the air guiding passage 5 between the air source device and the seat headrest rod 2, and the air pipe of the shunt air path 6 is placed inside the seat backrest.

[0047] Further, the diameter of the shunt gas path 6 is 1.25 to 2.5 times the diameter of the gas guiding path 5 disposed between the two shunt portions 15.

[0048] Specifically, as Figure 6 shown, the diameter of the shunt gas path 6 is set to be 1.25 to 2.5 times the diameter of the gas guiding path 5, so that the air flow fluctuations in the shunt gas path 6 can better match the air flow fluctuations in the gas guiding path 5, so as to achieve the purpose of mutual cancellation.

[0049] Further, an air flow frequency adjusting member 16 is connected in series on the shunt gas path 6.

[0050] Specifically, referring to Figure 8 , an air flow frequency adjusting cavity for adjusting the air flow frequency is formed inside the air flow frequency adjusting member 16, and the vibration frequency of the air flow is adjusted in the air flow frequency adjusting cavity, so that the air flow fluctuations in the gas guiding path 5 and the shunt gas path 6 can be more efficiently cancelled out with each other. The air flow frequency adjusting member 16 can be used as a silencer; by connecting the air flow frequency adjusting member 16 in series on the shunt gas path 6, the noise generated by the air flow in the shunt gas path 6 can be further reduced.

[0051] Further, the gas guiding path 5 and the shunt gas path 6 are connected through a connecting member 17, and the number of shunt ports on the connecting member 17 for communicating with the shunt gas path 6 is set corresponding to the number of the shunt gas paths 6 connected in parallel on the gas guiding path 5.

[0052] Specifically, referring to Figure 1 、 Figure 3 and Figure 5 , a pair of diversion ports for communicating with the gas guiding path 5 and at least a pair of shunt ports for communicating with the shunt gas path 6 are provided on the connecting member 17, and the first shunt portion 15-1 and the second shunt portion 15-2 are formed inside the connecting member 17. Multiple shunt gas paths 6 can be connected in parallel on each gas guiding path 5 to improve the noise reduction effect. When multiple shunt gas paths 6 are connected in parallel on the gas guiding path 5, the connecting member 17 is correspondingly replaced with a model including multiple pairs of shunt ports, so as to achieve the purpose of connecting multiple shunt gas paths 6 in parallel on the gas guiding path 5 through one connecting member 17.

[0053] Further, the shunt gas path 6 is in an arc structure or a square structure.

[0054] Specifically, the shunt gas path 6 can be extended in an arc gas path as shown in Figure 1 or extended in a square gas path as shown in Figure 7 .

[0055] Furthermore, guide posts 7 extending along the first aspect are provided on the inner wall of the headrest housing 3, and through holes 8 for the guide posts 7 to pass through are provided on the headrest fixing part 1.

[0056] Specifically, as Figure 4 and Figure 5 shown, the guide posts 7 are provided on the headrest housing cover 14 at the rear side, the guide posts 7 extend in the front-rear direction, the guide posts 7 penetrate through the through holes 8 on the headrest fixing part 1. Since the position of the headrest fixing part 1 is fixed, by providing the guide posts 7 and the through holes 8, the headrest housing 3 can slide relative to the headrest fixing part 1 in the front-rear direction while maintaining the stability of the headrest housing 3.

[0057] Furthermore, guide chutes 9 extending along the first aspect are provided on both sides of the headrest fixing part 1, and guide rails 10 slidably connected to the guide chutes 9 are provided on the inner wall of the headrest housing 3, and the sliding direction is the first direction.

[0058] Specifically, as Figure 4 and Figure 5 shown, guide chutes 9 are respectively provided on the left and right sides of the headrest fixing part 1, the guide chutes 9 extend in the front-rear direction, the guide rails 10 are provided on the left and right inner walls of the headrest housing 3, the guide rails 10 are clamped with the guide chutes 9 and can slide in the front-rear direction. The provision of the guide rails 10 and the guide chutes 9 is on the one hand convenient for the relative sliding of the headrest housing 3 and the headrest fixing part 1, and on the other hand can further improve the stability of the left and right sides between the headrest housing 3 and the headrest fixing part 1.

[0059] Furthermore, guide rib columns 11 are provided on the inner top wall and inner bottom wall of the headrest housing 3, and at least one limiting part 12 is provided on the guide rib columns 11, and the limiting part 12 extends along the first direction and abuts against the headrest fixing part 1.

[0060] Specifically, as Figure 4 shown, guide rib columns 11 are provided on the upper and lower inner walls of the headrest housing 3, at least one limiting part 12 is provided on the side of the guide rib columns 11 close to the headrest fixing part 1, the limiting part 12 is a long strip-shaped protrusion formed on the guide rib columns 11, the limiting part 12 extends in the front-rear direction, and the limiting part 12 is used to improve the stability of the headrest housing 3 in the up-down direction when sliding in the front-rear direction, and setting the limiting part 12 as a long strip can also avoid affecting the sliding of the headrest housing 3 in the front-rear direction.

[0061] Further, a non-woven fabric structure 13 is provided between the headrest fixing portion 1 and the abutting portion, and the non-woven fabric structure 13 is installed on the headrest fixing portion 1.

[0062] Specifically, the non-woven fabric structure 13 is disposed on the top and bottom surfaces of the headrest fixing portion 1, and the non-woven fabric structure 13 is filled between the limiting portion 12 and the headrest fixing portion 1. The function of the non-woven fabric structure 13 is to achieve buffering and vibration reduction by using a soft layer, and at the same time reduce the gap between the headrest outer shell 3 and the headrest fixing portion 1, so as to prevent the problem of shaking of the headrest outer shell 3 caused by unstable inflation and deflation of the pneumatic driving device 4.

[0063] Further, a lubricating grease is coated on the guiding slide rail 10 and the guiding column 7.

[0064] Specifically, by coating a lubricating grease on the guiding slide rail 10 and the guiding column 7, the relative sliding between the headrest outer shell 3 and the headrest fixing portion 1 is made smoother, and the abnormal noise generated during sliding is reduced.

[0065] Embodiment 2

[0066] Please refer to Figure 9 and Figure 10 , this embodiment provides another mobile headrest with a noise reduction function. The same content as in Embodiment 1 will not be described in detail. The differences are as follows:

[0067] An air flow frequency adjusting member 16 is connected in series on the air guiding path 5, and the shunt air path 6 is disposed inside the air flow frequency adjusting member 16 and is connected in parallel to the air guiding path 5 disposed inside the air flow frequency adjusting member 16.

[0068] Specifically, in this embodiment, the air flow frequency adjusting member 16 is connected in series on the air guiding path 5 to reduce the noise generated by the air flow in the air guiding path 5; a section of the air guiding path 5 is formed inside the air flow frequency adjusting member 16. In this embodiment, the shunt air path 6 is formed inside the air flow frequency adjusting member 16 and is connected in parallel to the air guiding path 5 inside the air flow frequency adjusting member 16. The shunt air path 6 in this embodiment further reduces noise on the basis of the air flow frequency adjusting member 16.

[0069] Embodiment 3

[0070] This embodiment provides another mobile headrest with a noise reduction function. The same content as in Embodiment 1 will not be described in detail. The differences are as follows:

[0071] When the number of the shunt air paths 6 connected in parallel on the air guiding path 5 is greater than or equal to two, adjacent shunt air paths 6 are arranged in a staggered manner along the extending direction of the air guiding path 5.

[0072] Specifically, as Figure 11 shown, taking the number of the shunt air paths 6 as two as an example, the two shunt air paths 6 are arranged in a staggered manner, and the two shunt air paths 6 are communicated with the air guiding path 5 through separate connectors 17; the first shunt part 15-1 at one end of one of the shunt air paths 6 is disposed between the first shunt part 15-1 and the second shunt part 15-2 of the other shunt air path 6.

[0073] Embodiment 4

[0074] This embodiment provides an automobile seat, including a seat backrest, a seat headrest rod 2, and a movable headrest with a noise reduction function as described in Embodiment 1 or Embodiment 2 or Embodiment 3.

[0075] Specifically, the automobile seat provided in this embodiment can realize the front-back adjustment of the seat headrest. The adjustment process is realized by charging and discharging the pneumatic driving device 4. The structure is simple. By setting the shunt air path 6, the noise generated by the airflow during the headrest adjustment can be reduced, and the riding experience of the members can be improved; moreover, the seat headrest structure is stable, and the shaking of the seat headrest caused by the unstable charging and discharging of the pneumatic driving device 4 can be prevented.

[0076] The above description is only the preferred embodiments of the present application and the description of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A mobile headrest with a noise reduction function, comprising a headrest fixing portion (1) and a headrest shell (3), wherein the headrest fixing portion (1) is mounted on the top of a seat headrest rod (2), the headrest shell (3) is sleeved on the outside of the headrest fixing portion (1), the inner cavity of the headrest shell (3) is divided by the headrest fixing portion (1) into two mounting cavities arranged along a first direction, the headrest shell (3) is slidably connected to the headrest fixing portion (1) along the first direction, and is characterized in that: Also includes: A pneumatic drive device (4), the pneumatic drive device (4) being arranged in the installation cavity, the volume of the pneumatic drive device (4) changing when inflating or deflating; at least two air-conducting passages (5), the air-conducting passages (5) being used to connect the pneumatic drive device (4) with an air source device; A shunt gas path (6), the shunt gas path (6) being connected in parallel to the air guide path (5), at least one shunt gas path (6) being correspondingly arranged on one of the air guide paths (5), and positions at both ends of the shunt gas path (6) communicating with the air guide path (5) forming a first shunt portion (15-1) and a second shunt portion (15-2), respectively, so that fluctuations of the air flow are offset by the shunt of the first shunt portion (15-1) and the confluence of the second shunt portion (15-2), thereby reducing noise.

2. The mobile headrest with noise reduction function according to claim 1, characterized in that: The air guide passage (5) extends from the air source device into the seat headrest rod (2) and penetrates the seat headrest rod (2), and extends into the installation cavity to communicate with the pneumatic drive device (4).

3. The mobile headrest with noise reduction function according to claim 2, characterized in that: The split air path (6) is connected in parallel to the air guide path (5) between the air source device and the seat headrest rod (2).

4. The mobile headrest with noise reduction function according to claim 3, characterized in that: The diameter of the diverter gas path (6) is 1.25 to 2.5 times the diameter of the gas guide path (5) disposed between the two diverter portions (15).

5. The movable headrest with noise reduction function according to claim 3, characterized in that: An airflow frequency adjustment component (16) is connected in series to the branch air path (6).

6. The movable headrest with noise reduction function according to claim 3, characterized in that: An airflow frequency regulating component (16) is connected in series to the air guide passage (5), and the branch air passage (6) is arranged inside the airflow frequency regulating component (16) and is connected in parallel to the air guide passage (5) disposed inside the airflow frequency regulating component (16).

7. The movable headrest with noise reduction function according to any one of claims 1 to 6, characterized in that: The air guide passage (5) and the diverter air passage (6) are connected via a connector (17); the number of diverter ports on the connector (17) for communicating with the diverter air passage (6) is arranged to correspond to the number of diverter air passages (6) connected in parallel on the air guide passage (5).

8. The movable headrest with noise reduction function according to any one of claims 1 to 6, characterized in that: The split flow path (6) is an arc-shaped structure or a square structure.

9. The movable headrest with noise reduction function according to any one of claims 1 to 6, characterized in that: When the number of the shunt gas paths (6) connected in parallel on the air guiding path (5) is greater than or equal to two, adjacent shunt gas paths (6) are staggered along the extension direction of the air guiding path (5).

10. A car seat, characterized in that: It comprises a seat back, a seat headrest rod (2) and a movable headrest with noise reduction function as claimed in any one of claims 1 to 9.

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