A negative pressure noise reduction car headrest

Abstract

The utility model provides a kind of negative pressure noise reduction car headrest, it is related to car headrest technical field, comprising: headrest body;Negative pressure pump, it is detachably arranged in the depending surface other side of the headrest body, for providing negative pressure power;And air pipe structure, it is set to the inside of the headrest body, the suction end of the negative pressure pump is communicated with the air pipe structure, the air pipe structure includes multiple air ports, multiple hoses and gas collector, multiple the air port is arranged in the two sides of the headrest body, multiple the hose is communicated with multiple the air port and the gas collector.The utility model has the beneficial effect that: by integrating in the negative pressure suction system of headrest body, under the vehicle high-speed open window driving condition in the sustained negative pressure adsorption area formed in the two sides of headrest, actively guide the separation airflow of vehicle window edge and headrest side and destroy turbulent vortex shedding periodicity, inhibit aerodynamic noise generation from source, realize broadband noise reduction effect, significantly improve in-vehicle acoustic comfort.

Description

Technical Field

[0001] This utility model relates to the field of automotive headrest technology, and in particular to a negative pressure noise reduction automotive headrest. Background Technology

[0002] Current automotive headrests, as key components of the seating system, primarily function to support occupants' heads, ensure collision safety, and provide basic adjustment convenience. While their structural design is becoming increasingly mature, their functional expandability is insufficient. When a vehicle is traveling at high speed, some occupants may open the windows for ventilation. At this time, the high-speed external airflow generates strong shear flow in the A-pillar, rearview mirror, and side window areas, forming a complex three-dimensional separation vortex structure at the window edges and the sides of the headrest. This results in significant aerodynamic noise, severely impacting the in-vehicle acoustic environment and ride comfort.

[0003] However, traditional headrest designs lack active aerodynamic intervention capabilities, and their single-function limitation makes them ineffective in suppressing the aforementioned turbulent noise. Currently, the industry generally reduces wind noise by optimizing the vehicle's shape or adding sound insulation materials, but there is a lack of specific solutions for the localized airflow separation problem on the sides of the headrest under conditions of driving with windows open. When faced with high-speed airflow impact, the surface and side edges of existing headrest structures experience severe pressure pulsations and vortex shedding, resulting in a significant increase in mid-to-high frequency noise. Therefore, there is an urgent need for a new type of headrest structure that can actively guide airflow and suppress vortex-induced vibrations, in order to achieve source control of aerodynamic noise while retaining basic functionality. Utility Model Content

[0004] In view of this, an embodiment of the present invention provides a negative pressure noise reduction car headrest.

[0005] An embodiment of this utility model provides a negative pressure noise reduction car headrest, comprising: headrest body; A negative pressure pump, which is detachably mounted on the other side of the support surface of the headrest body, is used to provide negative pressure power; An air tube structure is provided inside the headrest body. The suction end of the negative pressure pump is connected to the air tube structure. The air tube structure includes multiple air ports, multiple hoses, and an air collection tube. The multiple air ports are located on both sides of the headrest body. The multiple hoses connect the multiple air ports and the air collection tube. The air collection tube is connected to the negative pressure pump. By suctioning the air collection tube through the negative pressure pump, a negative pressure can be formed inside the headrest body, drawing in the gas from the sides of the headrest body. The gas collecting pipe is provided with a one-way structure, which includes a gas core, a valve plug and an elastic element. The valve plug is movably disposed in the gas core and can abut against the inner wall of the gas core to block the gas core. The elastic element is disposed between the gas core and the valve plug and is used to push the valve plug to block the gas core.

[0006] Furthermore, one end of the air core is provided with a guide hole, and the other end of the air core is provided with a sealing hole. The guide hole and the sealing hole are connected. The valve plug is slidably connected to the guide hole. One end of the valve plug extends from the guide hole into the sealing hole, and the end of the valve plug is provided with a sealing part. The diameter of the sealing part is larger than that of the guide hole, and it can seal the air core when it abuts against the connecting part of the sealing hole and the guide hole.

[0007] Furthermore, a spring seat is provided inside the gas collecting pipe, one end of the elastic element is connected to the spring seat, and the other end of the elastic element abuts against the sealing part.

[0008] Furthermore, the valve plug has a countersunk hole at one end facing the guide hole, and the outer wall of the valve plug has multiple air holes communicating with the countersunk hole.

[0009] Furthermore, a sealing ring is provided at one end of the inner wall of the sealing hole that connects to the guide hole, and the sealing part abuts against the sealing ring.

[0010] Furthermore, an electric pulling rod is provided inside the gas collecting pipe. The movable end of the electric pulling rod is connected to the sealing part. The electric pulling rod can pull the sealing part to move and compress the elastic element.

[0011] Furthermore, the plurality of air ports are rectangular in shape and connected to the hose via connectors.

[0012] Furthermore, a mounting plate is provided on the rear side of the headrest body, the negative pressure pump is mounted on the mounting plate, and the air collection pipe is a three-way pipe, with one end passing through the mounting plate and communicating with the negative pressure pump.

[0013] The beneficial effects of the technical solution provided by the embodiments of this utility model are as follows: The negative pressure noise reduction car headrest of this utility model, through the negative pressure suction system integrated into the headrest body, forms a continuous negative pressure adsorption zone on both sides of the headrest when the vehicle is driving at high speed with the windows open. It actively guides the separation of airflow between the edge of the window and the side of the headrest and destroys the periodicity of turbulent vortex shedding, thereby suppressing the generation of aerodynamic noise from the source, achieving a wide-band noise reduction effect, and significantly improving the acoustic comfort inside the vehicle; the electric tow bar is connected to the vehicle CAN bus for control, and can intelligently adjust the opening and closing sequence of the one-way valve and the working condition of the negative pressure pump according to the real-time vehicle speed and the window opening and closing status. While ensuring the noise reduction requirements when the window is open at high speed, it automatically reduces energy consumption during low speed or window-closed periods, achieving a balance and optimization between noise reduction efficiency and overall vehicle energy consumption. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the negative pressure noise reduction car headrest of this utility model; Figure 2 This is a schematic diagram of the air duct structure of the negative pressure noise reduction car headrest of this utility model; Figure 3 This is a schematic diagram of the air collection pipe structure of the negative pressure noise reduction car headrest of this utility model.

[0015] In the diagram: 1. Headrest body; 2. Mounting plate; 3. Negative pressure pump; 4. Air inlet; 5. Connector; 6. Hose; 7. Air collection pipe; 8. Air core; 81. Guide hole; 82. Sealing hole; 9. Valve plug; 10. Air hole; 11. Sealing part; 12. Spring seat; 13. Elastic element; 14. Electric traction rod. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be further described below with reference to the accompanying drawings. The following description presents a preferred embodiment of several possible embodiments of this utility model, intended to provide a basic understanding of the utility model, but not intended to identify the key or decisive elements of the utility model or to limit the scope of protection sought.

[0017] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0018] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures. Also, it should be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale.

[0020] In the description of this utility model, it should be noted that the circuits, electronic components and modules involved in this utility model are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated. The content protected by this utility model does not involve any improvement to the internal structure and method.

[0021] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Please refer to Figure 1 The present invention provides a negative pressure noise reduction car headrest comprising a headrest body 1, a negative pressure pump 3, and an air tube structure built into the headrest body 1.

[0023] The headrest body 1 adopts a conventional automotive seat headrest frame structure, with an internal injection-molded ABS plastic frame covered by polyurethane foam filling, and the outermost layer being a fabric or leather cover. The headrest body 1 has a support surface facing the occupant's head and an opposite back surface. Four rectangular air vent mounting holes, each 30mm x 5mm, are provided on each of the left and right sides of the headrest body 1 (i.e., the lateral sides in the vehicle's direction of travel).

[0024] Air inlet 4 is a rectangular suction nozzle made of aluminum alloy or high-strength plastic. The outer diameter of the small end is interference-fitted with the mounting hole and sealed with a sealing ring (not shown). The large end faces outward and can also be equipped with a protective grille to prevent foreign objects from being sucked in. The four air inlets 4 on each side are arranged in a rectangular array along the height of the headrest, with a longitudinal spacing of 30mm and a lateral staggered arrangement to cover the airflow separation area on the side of the headrest.

[0025] The tracheal structure includes flexible tubes 6 and a gas collection tube 7. Flexible tubes 6 are silicone rubber corrugated tubes with an inner diameter of 6mm. One end of each flexible tube 6 is sealed to the small end of the corresponding air port 4 via a connector 5, and the other end is collected into the gas collection tube 7. The gas collection tube 7 is a PVC tee pipe. The horizontal section runs through the pre-set channel of the ABS frame along the width of the headrest. Its two horizontal interfaces are respectively connected to four flexible tubes 6 on the left and right sides via pagoda connectors for compression and fixation. The vertical section extends towards the back.

[0026] The negative pressure pump 3 is a miniature 12V DC brushless vacuum pump with a rated flow rate of 8L / min and a noise level below 40dB(A). A 2mm thick steel plate stamped mounting plate 2 is bolted to the back of the headrest body 1. A cylindrical connecting seat with internal threads is welded to the center of the mounting plate 2. The bottom of the pump body of the negative pressure pump 3 has an external thread interface, forming a detachable threaded connection with the connecting seat. A rubber shock-absorbing pad is sandwiched between the two to reduce vibration transmission. The suction end of the negative pressure pump 3 is a pagoda-shaped air inlet, which is interference-fitted with the vertical section of the air collecting pipe 7 through an airtight rubber sleeve with a matching inner diameter and locked with a stainless steel clamp to ensure airtightness and detachability. Thus, when the negative pressure pump 3 is working, it draws airflow sequentially from both sides of the headrest body 1 through the air collecting pipe 7, the hose 6, and the air port 4.

[0027] Noise reduction principle: When the vehicle is traveling at high speed and the side windows are open, the external airflow forms a turbulent vortex street on the side of the headrest. The negative pressure pump 3 maintains a negative pressure of -5kPa to -8kPa at the air inlet 4, generating a directional adsorption force that draws the turbulent vortex in the separation zone toward the air inlet 4, disrupting the vortex shedding periodicity and reducing broadband noise.

[0028] Second embodiment (one-way anti-backflow type) Based on the first embodiment, this embodiment adds a one-way structure inside the air collection pipe 7 to prevent the airflow from flowing in reverse when the negative pressure pump 3 stops, thus preventing secondary pollution and noise.

[0029] The junction of the gas collection pipe 7 and the three-way valve is integrally injection molded into a one-way valve mounting cavity. The one-way structure includes a gas core 8, a valve plug 9, and an elastic element 13.

[0030] The air core 8 is a stepped brass cylinder with a guide hole 81 at one end and a sealing hole 82 at the other end, which are coaxially connected to form an airflow channel. The outer wall of the air core 8 is threaded to the mounting cavity, and the connection is wrapped with polytetrafluoroethylene sealing tape.

[0031] The valve plug 9 is clearance-fitted with the guide hole 81. The end of the valve plug 9 facing the sealing hole 82 has an integrally formed frustum-shaped sealing part 11, the size of which is larger than the diameter of the guide hole 81. An EPDM rubber sealing layer is vulcanized and bonded to the end face of the sealing part 11.

[0032] The elastic element 13 is a stainless steel compression spring. A cross-shaped spring seat 12 is integrally formed on the inner wall of the gas collecting pipe 7, and a positioning boss is set at the center of the spring seat 12. One end of the spring is fitted onto the boss, and the other end abuts against the bottom surface of the countersunk hole of the sealing part 11 to provide closing force.

[0033] The air hole 10 is a radial through hole, which is opened on the side wall of the valve plug 9 near the guide hole 81 and communicates with the central countersunk hole of the valve plug 9 to ensure that the airflow can enter the interior of the valve plug 9 through this hole.

[0034] Working principle: When the negative pressure pump 3 starts, a negative pressure is generated in the air collecting pipe 7. The pressure difference across the valve plug 9 overcomes the spring force, causing the sealing part 11 to disengage from the sealing hole 82. The airflow flows from the air port 4 through the hose 6, air collecting pipe 7, guide hole 81, air hole 10, and countersunk hole to the negative pressure pump 3. When the pump stops, the spring force pushes the valve plug 9 back to its original position, and the sealing part 11 abuts against the sealing ring (fluororubber O-ring) embedded in the sealing hole 82 to prevent reverse airflow.

[0035] Third embodiment (active control type) Based on the second embodiment, this embodiment adds an electric towing rod 14 to realize active control of the one-way valve, so as to adapt to the noise reduction requirements at different vehicle speeds.

[0036] The electric tow bar 14 is a linear actuator driven by a miniature stepper motor. Its housing is fixed to the inner wall of the air collection pipe 7, and the motor axis coincides with the axis of the valve plug 9. The telescopic end of the electric tow bar 14 is equipped with a hook, which is connected to the hanging ring on the end face of the sealing part 11. The stepper motor is connected to the vehicle CAN bus controller via a wiring harness, and the controller receives the vehicle speed signal.

[0037] Control logic: When the vehicle speed exceeds 60km / h and the window opening signal is triggered, the controller drives the electric pull rod 14 to shorten, forcibly opening the one-way valve; when the vehicle speed is below 30km / h or the window is closed, the one-way valve closes under the elastic force of the elastic element 13, avoiding the negative pressure system from operating ineffectively and generating additional energy consumption. In an optional embodiment, the connection structure between the air port 4 and the hose 6 is optimized to improve assembly efficiency and sealing reliability.

[0038] Connector 5 is a rectangular polycarbonate module with four copper air nozzle connectors pre-embedded on it. The spacing between the connectors matches the diameter of the hose 6. The smaller end of the air port 4 is inserted into the connector and locked with a snap ring. The end of the hose 6 is sleeved on the outer edge of the connector, and then sealed with heat shrink tubing to form a modular air port assembly. This assembly is embedded in a pre-set rectangular groove in the headrest body 1 frame, facilitating rapid assembly on the production line and after-sales replacement.

[0039] In an optional embodiment, the negative pressure pump 3 is embodied with a detachable connection structure to improve maintenance convenience.

[0040] The inner wall of the connector of mounting plate 2 has a double-ended trapezoidal internal thread. The external thread interface at the bottom of the negative pressure pump 3 is made of stainless steel. During installation, the interface is screwed into the connector. The locking ring is a nylon ring with knurled outer surface and a single-ended trapezoidal thread on its inner wall, which can be quickly screwed to the end of the interface and pressed against the end face of the connector to achieve double locking. During disassembly, simply loosen the locking ring and rotate the negative pressure pump 3 in the opposite direction about 1.5 turns to separate it, without tools.

[0041] In this document, the directional terms such as front, back, top, and bottom are defined based on the position of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that these are relative concepts and can vary depending on different methods of use and placement; the use of these directional terms should not limit the scope of protection claimed in this application.

[0042] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A negative pressure noise-reducing car headrest, characterized in that, include: Headrest body (1); A negative pressure pump (3), which is detachably mounted on the other side of the support surface of the headrest body (1), is used to provide negative pressure power; The airway structure is located inside the headrest body (1). The suction end of the negative pressure pump (3) is connected to the airway structure. The airway structure includes multiple air ports (4), multiple hoses (6), and an air collection tube (7). The multiple air ports (4) are located on both sides of the headrest body (1). The multiple hoses (6) connect the multiple air ports (4) and the air collection tube (7). The air collection tube (7) is connected to the negative pressure pump (3). By suctioning the air collection tube (7) by the negative pressure pump (3), a negative pressure can be formed inside the headrest body (1), and the gas on the side of the headrest body (1) can be sucked in. The gas collecting pipe (7) is provided with a one-way structure, which includes a gas core (8), a valve plug (9) and an elastic element (13). The valve plug (9) is movably disposed in the gas core (8) and can abut against the inner wall of the gas core (8) to block the gas core (8). The elastic element (13) is disposed between the gas core (8) and the valve plug (9) to push the valve plug (9) to block the gas core (8).

2. The negative pressure noise reduction car headrest as described in claim 1, characterized in that: One end of the air core (8) is provided with a guide hole (81), and the other end of the air core (8) is provided with a sealing hole (82). The guide hole (81) is connected to the sealing hole (82). The valve plug (9) is slidably connected to the guide hole (81). One end of the valve plug (9) extends from the guide hole (81) into the sealing hole (82), and the end of the valve plug (9) is provided with a sealing part (11). The diameter of the sealing part (11) is larger than that of the guide hole (81), and it can seal the air core (8) when it abuts against the connecting part of the sealing hole (82) and the guide hole (81).

3. The negative pressure noise reduction car headrest as described in claim 2, characterized in that: The gas collecting pipe (7) is provided with a spring seat (12) inside. One end of the elastic element (13) is connected to the spring seat (12), and the other end of the elastic element (13) abuts against the sealing part (11).

4. The negative pressure noise reduction car headrest as described in claim 3, characterized in that: The valve plug (9) has a countersunk hole at one end facing the guide hole (81), and the outer wall of the valve plug (9) has a plurality of air holes (10) that communicate with the countersunk hole.

5. The negative pressure noise reduction car headrest as described in claim 2, characterized in that: The inner wall of the sealing hole (82) is connected to one end of the guide hole (81) and a sealing ring is provided. The sealing part (11) abuts against the sealing ring.

6. The negative pressure noise reduction car headrest as described in claim 5, characterized in that: An electric pull rod (14) is provided inside the gas collection pipe (7). The movable end of the electric pull rod (14) is connected to the sealing part (11). The electric pull rod (14) can pull the sealing part (11) to move and compress the elastic element (13).

7. The negative pressure noise reduction car headrest as described in claim 1, characterized in that: The multiple air ports (4) are rectangular and connected to the hose (6) via connectors (5).

8. The negative pressure noise reduction car headrest as described in claim 1, characterized in that: The headrest body (1) is provided with a mounting plate (2) on its rear side. The negative pressure pump (3) is mounted on the mounting plate (2). The air collection pipe (7) is a three-way pipe, with one end passing through the mounting plate (2) and connecting to the negative pressure pump (3).

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