CN114399989A - Automatic noise reduction device, seat and vehicle - Google Patents

Abstract

The embodiment of the application discloses automatic device, seat and vehicle of making an uproar falls relates to the technical field of making an uproar, simple structure, and cost of maintenance is low, can eliminate the noise elimination frequency under the different operating modes automatically, reduces driver and crew's sense of pressure ear, improves the travelling comfort. The automatic noise reduction device comprises a shell, a partition plate, a vent pipe and a driving assembly, wherein an accommodating cavity extending along a first direction is formed in the shell, the partition plate is arranged in the accommodating cavity and extends along a plane vertical to the first direction, and the edge of the partition plate is in sealed sliding connection with the inner wall of the accommodating cavity; the vent pipe is arranged on the shell and communicated with the accommodating cavity, the partition board and the accommodating cavity are enclosed to form a cavity, the vent pipe is a silencing cavity, and the vent pipe is used for communicating the silencing cavity with the outside; and the driving assembly is fixed on the shell and is used for driving the partition plate to slide in the silencing cavity along the first direction so as to change the volume of the silencing cavity. The automatic noise reduction device is used for eliminating or reducing the frequency of noise.

Description

An automatic noise reduction device, seat and vehicle

technical field

The present application relates to, but is not limited to, the technical field of noise reduction, and in particular, to an automatic noise reduction device, a seat, and a vehicle.

Background technique

Rest and sleep are necessary conditions for people to eliminate fatigue, restore physical strength and maintain health, but noise makes people restless and difficult to rest and fall asleep. When people toss and turn and cannot fall asleep, symptoms such as nervousness, shortness of breath, increased pulse beat, and constant brain excitement will occur, which will cause people to feel tired or weak the next day, which will affect work and study. Neurasthenia, manifested as insomnia, tinnitus, etc.

In particular, people who work in noise sources are most seriously affected. For example, when they get off an airplane or come out of a forging workshop, their ears are always buzzing, and they can't even hear the voice of the other party. They will recover after a while. The phenomenon is called auditory fatigue, which is a protective response of the human auditory organs to the external environment. If people are exposed to noise for a long time, it will cause tinnitus, hearing loss, etc. It takes several hours or even a dozen hours to return to normal after leaving the noise environment. In the long run, it will lead to organic damage to the auditory organs, resulting in hearing loss.

Referring to FIG. 1 , an existing noise reduction device uses a noise reduction system, such as an ANC system 01, to emit reverse sound waves to ambient noise through a speaker 02 to neutralize the noise, thereby achieving a noise reduction effect. The existing noise reduction device needs to be equipped with a noise reduction system, which is expensive and difficult to design, and the reverse acoustic wave control has a delay. With long-term use, it has the risk of failure, which indirectly increases the maintenance cost of the vehicle. To this end, the present application provides an automatic noise reduction device, a seat and a vehicle.

SUMMARY OF THE INVENTION

The embodiments of the present application provide an automatic noise reduction device, a seat and a vehicle, which have a simple structure, low maintenance cost, and can automatically adjust the muffler frequency under different working conditions, thereby achieving the effect of adaptive muffling and reducing the number of drivers and passengers. The pressure on the ear can improve the comfort.

In order to achieve the above purpose, the technical solutions of the embodiments of the present application are implemented as follows:

In a first aspect, an automatic noise reduction device provided by the present application includes a casing, a baffle, a vent pipe and a drive assembly, wherein a accommodating cavity extending along a first direction is formed in the casing, and the baffle is arranged in the accommodating cavity and The partition plate extends along a plane perpendicular to the first direction, and the edge of the partition plate is in sealing and sliding connection with the inner wall of the accommodating cavity. The anechoic cavity is provided with the vent pipe, and the vent pipe is used to communicate the anechoic cavity with the outside world; the driving component, the driving component is fixed on the outer casing, and the driving component is used to drive the partition plate to slide in the anechoic cavity along the first direction, so as to change the anechoic cavity. volume of the sound cavity.

In the automatic noise reduction device provided by the embodiments of the present application, since an accommodation cavity extending along the first direction is formed in the casing, the partition plate is arranged in the accommodation cavity, and the edge of the baffle plate and the accommodation cavity are sealedly connected to form a closed area to form a muffler cavity , the vent pipe is arranged on the housing, and the vent pipe is communicated with the muffler cavity. The drive assembly can drive the partition plate to slide along the inner wall of the muffler cavity in the first direction, resulting in a change in the volume of the muffler cavity. The frequency of the sound is controlled by the driving component to drive the partition plate to slide along the inner wall of the muffler cavity in the first direction to eliminate sounds of different frequencies, thereby reducing the roaring sound under different working conditions. The noise reduction device in the related art uses a noise reduction system, which has a high maintenance cost and is prone to delay during long-term use. Compared with the noise reduction device mentioned in the related art, the present application uses a simple mechanical structure. The noise reduction effect can be achieved by changing the volume of the muffler cavity, and the noise reduction device is simple in design, easy to implement, low in maintenance cost, and easy to use. The noise reduction device has a simple structure and low maintenance cost, and can automatically eliminate the muffling frequency under different working conditions, which has the effect of muffling the noise, reduces the ear pressure of the driver and passengers, and improves the comfort.

In a possible implementation manner of the present application, the driving component includes a controller and an electromagnet, and the controller is used to control the electromagnet to generate an electromagnetic force according to an external environment, so that the electromagnet drives the partition plate to slide on the inner wall of the muffler cavity along the first direction .

In the automatic noise reduction device provided by the embodiment of the present application, since the magnetism of the electromagnet is controlled by the on-off of the current, when the current is turned off, the magnetism of the electromagnet will disappear immediately, and when it is turned on, the magnetism of the electromagnet will be generated immediately, and the response speed Fast, therefore, the driving component includes a control part and an electromagnet. When the external environment signal is introduced into the controller, the controller generates a current, and the electromagnet generates an electromagnetic force. With the change of the signal strength, the current changes, causing the change of the magnetism of the electromagnet. , so that the electromagnet drives the diaphragm to slide on the inner wall of the muffler cavity along the first direction.

In a possible implementation of the present application, the separator is made of a metal magnetically conductive material

The automatic noise reduction device provided by the embodiment of the present application has many kinds of metal materials and is easy to obtain, and the partition plate is made of metal magnetic conductive material, which is lower in cost and easy to obtain compared with other magnetic conductive materials.

In a possible implementation manner of the present application, the separator is a permanent magnet, and the controller is used to control the electromagnet to generate an electromagnetic force according to the external environment, so as to attract or repel the separator.

In the automatic noise reduction device provided by the embodiment of the present application, the permanent magnet can provide a constant magnetic field intensity, coercive force, and the residual magnetic induction intensity and the maximum magnetic energy level are relatively large, and can provide a strong magnetic field and electromagnetic force in a small volume to attract or exclusion.

In a possible implementation manner of the present application, the automatic noise reduction device further includes a restoring component, and the restoring component is used to make the baffle be located at the initial position in the accommodating cavity.

In the automatic noise reduction device provided by the embodiment of the present application, when the automatic noise reduction device is not working, the partition plate is located in the accommodating cavity, when the partition plate is perpendicular to the ground, the partition plate is not affected by gravity, and when the partition plate is parallel to the ground or When it exists at other angles, it is necessary to overcome the influence of gravity, so the automatic noise reduction device is provided with a recovery component, which is used to overcome the effect of the gravity of the baffle, so that the baffle is located in the initial position of the accommodating cavity.

In a possible implementation manner of the present application, the recovery component includes an elastic member, the elastic member is located in the muffler cavity, the first end of the elastic member is fixed on the partition plate, and the second end is fixed on the inner wall of the muffler cavity away from the partition plate.

In the automatic noise reduction device provided by the embodiment of the present application, the baffle plate needs to slide on the inner wall of the muffler cavity. Therefore, the restoring component needs to overcome the influence of the gravity of the baffle plate, and also needs to slide on the inner wall of the muffler cavity with the baffle plate. The assembly includes an elastic piece, the elastic piece is located in the muffler cavity, the first end of the elastic piece is fixed on the partition plate, and the second end is fixed on the inner wall of the muffler cavity away from the partition board, and is extended and compressed with the elastic piece.

In a possible implementation manner of the present application, the elastic member is a spring.

In the automatic noise reduction device provided in the embodiment of the present application, the elastic member is selected as a spring, and the elastic force of the spring is easy to calculate, and is only related to the stiffness coefficient and the elongation length of the spring. In the process of calculating the force, it is easy to select the size and type.

In a possible implementation manner of the present application, there are multiple springs, and the springs are evenly distributed in the muffler cavity.

In the automatic noise reduction device provided by the embodiment of the present application, when the volume of the partition plate is large and the gravity is large, one spring may not be able to support it. Therefore, multiple springs can be provided, and the springs are evenly distributed in the muffler cavity.

In a possible implementation manner of the present application, the ventilation pipe is an elongated cylindrical structure outside the casing.

In the automatic noise reduction device provided by the embodiment of the present application, the shape and length of the ventilation pipe and the volume of the muffler cavity are related to the muffling frequency. For the convenience of calculation, the ventilation pipe is set as an elongated cylindrical structure outside the casing.

In a possible implementation manner of the present application, the controller is used to control the magnitude of the electromagnetic force generated by the electromagnet according to the silencing frequency required by the external environment, wherein the calculation formula of the silencing frequency is as follows:

Among them, f represents the anechoic frequency; A represents the cross-sectional area of the ventilation pipe; L represents the length of the ventilation pipe; V represents the volume of the muffler cavity.

In a second aspect, an embodiment of the present application provides a seat, which includes the automatic noise reduction device provided in the first aspect, and the automatic noise reduction device is arranged in the seat.

The embodiment of the present application provides a seat, which has the same technical effect because it includes the automatic noise reduction device provided in the first aspect, that is, the structure is simple, the maintenance cost is low, and the noise reduction under different working conditions can be automatically eliminated. frequency, play the effect of noise reduction, reduce the pressure on the ears of the driver and passenger, and improve the comfort.

In a possible implementation manner of the present application, the seat includes a base, a backrest and a headrest, and the automatic noise reduction device is arranged in one or more of the base, the backrest and the headrest.

In a third aspect, an embodiment of the present application provides a vehicle, including a frame and the seat provided in the second aspect, and the seat is disposed inside the frame.

The embodiment of the present application provides a vehicle, which has the same technical effect because it includes the seat provided in the second aspect, that is, the structure is simple, the maintenance cost is low, and the muffling frequency under different working conditions can be automatically eliminated, It has the effect of noise reduction, reduces the pressure on the ears of the driver and passengers, and improves the comfort.

In a possible implementation manner of the present application, the frame includes an outer frame column, and the automatic noise reduction device is provided in the outer frame column.

In a possible implementation manner of the present application, the vehicle further includes wheels, and an automatic noise reduction device is arranged in the wheels.

Description of drawings

1 is a schematic diagram of a noise reduction device provided in the related art;

2 is a schematic diagram of a seat provided by an embodiment of the present application;

3 is a schematic diagram of a headrest provided in an embodiment of the present application;

4 is a schematic diagram of placing the automatic noise reduction device provided in an embodiment of the present application in a headrest;

5 is a schematic diagram of an automatic noise reduction device provided by an embodiment of the present application;

FIG. 6 is a schematic diagram of an automatic noise reduction device provided by an embodiment of the present application;

FIG. 7 is a schematic diagram of the automatic noise reduction device provided by the embodiment of the present application when the baffles are located in multiple positions;

FIG. 8 is a comparative graph of the roaring sound of the headrest provided with the automatic noise reduction device and the headrest without the noise reduction device according to the embodiment of the present application.

reference number

01-noise reduction system; 02-speaker; 1-housing; 11-accommodating cavity; 12-anechoic cavity; 2-partition plate; 21-first position; 22-second position; 23-third position; 3-pass Trachea; 4-drive assembly; 41-controller; 42-electromagnet; 5-spring; 6-seat; 61-base; 62-back; 63-headrest.

Detailed ways

It should be noted that the embodiments in this application and the technical features in the embodiments can be combined with each other without conflict. Improper restrictions on this application.

In order to make the purposes, technical solutions and advantages of the embodiments of the present application more clear, the specific technical solutions of the present application will be described in further detail below with reference to the accompanying drawings in the embodiments of the present application. The following examples are used to illustrate the present application, but are not intended to limit the scope of the present application.

In the embodiments of the present application, the terms "first" and "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

In addition, in the embodiments of the present application, orientation terms such as "upper", "lower", "left" and "right" are defined relative to the orientations in which the components in the drawings are schematically placed, and it should be understood that these orientations Sexual terms are relative concepts, they are used for relative description and clarification, which may vary according to the orientation in which components are placed in the figures.

In the embodiments of the present application, unless otherwise expressly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" may be a fixed connection, a detachable connection, or an integrated body; it may be a direct connection , or indirectly through an intermediary.

In the embodiments of the present application, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, but also Include other elements not expressly listed, or which are inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or illustrations. Any embodiment or design described in the embodiments of the present application as "exemplary" or "such as" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present the related concepts in a specific manner.

The embodiments of the present application provide a vehicle, which in a narrow sense refers to all man-made devices used for human travel or transportation, and the vehicles are divided into land vehicles, water vehicles and air vehicles. Land vehicles can be Bicycles, motorcycles, buses, cars, trolleybuses or subways, etc.; water vehicles can be boats, cruise ships, sailboats, hovercraft, etc.; and air vehicles can be civil aviation aircraft, jets, turboprops, etc., this application The embodiment does not specifically limit the specific form of the above-mentioned vehicle.

In the following embodiments, for the convenience of description, an automobile is used as an example for illustration.

Cars will produce various sounds during driving, which will affect people's mood and, over time, their health. The noise of the car during driving mainly comes from the following aspects. First, the noise generated by the friction between the tire and the road during the driving process may be transmitted to our car through the glass at any time, affecting the The driving experience of the driver; secondly, when the car is running, the high-speed rotating engine will make noise, and the sound when the engine is running at a high speed is unavoidable; thirdly, the car is driving The relative speed between the vehicle body and the outside air is too fast, that is, the air noise caused by the excessive wind resistance coefficient. This part of the noise cannot be avoided. Therefore, the embodiment of the present application provides an automatic noise reduction device, which can be adjusted by changing the volume of the muffler cavity. Reduce or eliminate frequency sounds and reduce roaring sound under certain conditions.

A car usually consists of an engine, chassis, body and electrical equipment. The engine is generally the power unit of the automobile, which can burn the fuel in it to generate power. It is generally composed of the body and the crank connecting rod mechanism, the valve mechanism, the fuel supply system, the cooling system, the lubrication system, the ignition system and the starting system; the chassis is generally composed of It is composed of power train, driving system, steering system and braking system; the body is the structure that forms the space for the driver and passengers, and it is also a tool for storing luggage or other items; the most important component of the car is electrical equipment, which is generally composed of power supply, Engine ignition system (gasoline engine) and starting system, lighting and signaling devices, air conditioning instruments and alarm systems, and auxiliary electrical appliances. Referring to Figure 2, the car can also be divided into a frame and a seat 6. The frame can include an outer frame column, such as A /B-pillar, the frame can also include wheels, etc. The friction between the wheel and the road will generate noise. An automatic noise reduction device can be placed inside the wheel to reduce or eliminate part of the noise generated by friction by changing the volume of the muffler cavity. The frequency is reduced to the frequency range that cannot be transmitted to our car through the glass, or to the frequency range that the sound through the glass is acceptable to the human body; the automatic noise reduction device can also be set on the outer frame column, when the car body When a collision occurs in a dangerous situation or a bumpy road hits the outer frame cylinder, a loud sound will occur, causing damage to human ears. Placing the automatic noise reduction device on the outer frame cylinder can reduce or eliminate part of the sound frequency and make it more suitable for the human body. The damage to the human ear is minimized. It should be added that the automatic noise reduction device can be installed in any place inside the car where noise can be generated, and different numbers of automatic noise reduction devices can be selected according to the size of the noise generated and the degree of harm of the noise to the human body. Automatic noise reduction devices are not limited to the automotive field.

As shown in FIG. 2, FIG. 3 and FIG. 4, the seat 6 is the place with the largest contact area between the car and the human body, and whether the seat 6 is comfortable is the most intuitive feeling of the human body. In general, the seat 6 includes a base 61 , the backrest 62 and the headrest 63, so these three places are also the main sources of noise. During the process of getting up or sitting down or moving, the human body will generate noise with the seat 6, and the noise is directly transmitted to the ears of people, affecting people Therefore, the automatic noise reduction device can be installed on the seat 6, in any one of the base 61, the backrest 62 or the headrest 63, or in the base 61, the backrest 62 and the headrest 63. All automatic noise reduction devices can be installed, either one automatic noise reduction device can be installed in one place, or multiple noise reduction devices can be installed in one place. The specific number and the specific location of the placement are determined according to the actual situation, which is not limited in this application.

The automatic noise reduction device provided by the embodiments of the present application is mentioned above. Next, the automatic noise reduction device will be described in detail. As shown in FIG. 4. The housing 1 has an accommodating cavity 11 extending in the first direction, the partition 2 is arranged in the accommodating cavity 11 and the partition 2 extends along a plane perpendicular to the first direction, and the edge of the partition 2 is connected to the accommodating cavity. The inner wall of 11 is sealed and slidingly connected; the ventilation pipe 3 is arranged on the casing 1 and communicates with the accommodating cavity 11. In the cavity enclosed by the partition 2 and the accommodating cavity 11, the ventilation pipe 3 is provided with the muffler cavity 12, and the ventilation pipe 3 Used to communicate the muffler cavity 12 with the outside world; the drive assembly 4, the drive assembly 4 is fixed on the housing 1, and the drive assembly 4 is used to drive the partition plate 2 to slide in the muffler cavity 12 along the first direction to change the muffler cavity 12. volume.

Referring to FIG. 5 , since an accommodating cavity 11 extending along the first direction is formed in the housing 1 , the partition plate 2 is arranged in the accommodating cavity 11 , and the edge of the partition plate 2 is sealedly connected with the accommodating cavity 11 to form a closed area and form a muffler cavity 12 , the ventilation pipe 3 is arranged on the casing 1, and the ventilation pipe 3 is communicated with the muffler cavity 12. The drive assembly 4 can drive the partition plate 2 to slide along the inner wall of the muffler cavity 12 in the first direction, causing the volume of the muffler cavity 12 to change, driving The assembly 4 can control the drive assembly 4 to drive the partition 2 to slide along the inner wall of the muffler cavity 12 in the first direction according to the external environment or the frequency to be muffled to eliminate sounds of different frequencies, thereby reducing the roaring sound under different working conditions.

In some embodiments provided in this application, referring to FIG. 5 , the drive assembly 4 can be selected as a rack and pinion drive, a belt drive can also be selected, and a lead screw assembly drive can also be selected. When the drive assembly 4 selects a rack and pinion drive, The drive assembly 4 includes the main gear, the auxiliary gear and the rack. The main gear and the auxiliary gear are wound around the rack, and the auxiliary gear is connected to the partition plate 2. The main gear can be rotated according to the external environment or the frequency to be silenced and driven by the rack. The auxiliary gear rotates to drive the partition plate 2 to slide along the inner wall of the muffler cavity 12 in the first direction to eliminate sounds of different frequencies; when the drive assembly 4 is a belt drive, the drive assembly 4 includes the main pulley, the auxiliary pulley and the conveyor belt. The pulley and the auxiliary pulley are wound on the conveyor belt, and the auxiliary pulley is connected with the partition plate 2. The main pulley can rotate according to the external environment or the frequency to be silenced. The conveyor belt drives the auxiliary pulley to rotate and then drives the partition plate 2 along the first The inner wall of the muffler cavity 12 slides in the direction of the direction to eliminate the sound of different frequencies; when the drive assembly 4 is driven by the screw assembly, the partition plate 2 is connected with the ball screw, and the receiver makes the ball screw according to the external environment or the frequency to be muffled. The rotation drives the partition plate 2 to slide along the inner wall of the muffler cavity 12 in the first direction.

The present application provides a preferred solution. Referring to FIG. 5 and FIG. 6 , since the magnetism of the electromagnet 42 is controlled by the on-off of the current, when the current is turned off, the magnetism of the electromagnet 42 will disappear immediately. The magnetism of 42 is generated immediately, and the response speed is fast. The driving component 4 includes a controller 41 and an electromagnet 42. The controller 41 can drive the electromagnet 42 to generate a magnetic force according to the external environment, so that the electromagnet 42 drives the diaphragm 2 along the first direction. The inner wall of the muffler cavity 12 slides. When the external environment or the frequency to be muffled is introduced into the controller 41, the controller 41 generates current, and the electromagnet 42 generates electromagnetic force. The electromagnet 42 drives the diaphragm 2 to slide on the inner wall of the muffler cavity 12 along the first direction, so that the volume of the muffler cavity 12 changes, so as to achieve the purpose of muffling.

It should be explained that, as shown in FIG. 5 , the accommodating cavity 11 can be either open or closed, and the muffling cavity 12 is a part of the accommodating cavity 11 . The accommodating cavity 11 is provided with an exhaust hole to reduce the influence of the pressure during the sliding process of the partition plate 2. In order to save the space occupied by the device, the electromagnet 42 is made into the same shape as the muffler cavity 12 and the accommodating cavity 11. It is arranged on the accommodating cavity 11 so that the accommodating cavity 11 forms a closed space, and an exhaust hole is arranged in the accommodating cavity 11 not located in the part of the muffler cavity 12 to reduce the influence of the pressure of the baffle 2 during the sliding process.

5 , specifically, the controller 41 is used to control the magnitude of the electromagnetic force generated by the electromagnet 42 according to the silencing frequency required by the external environment, wherein the calculation formula of the silencing frequency is as follows:

Wherein, f represents the silencing frequency; A represents the cross-sectional area of the ventilation pipe 3 ; L represents the length of the ventilation pipe 3 ; V represents the volume of the muffler cavity 12 .

5 , it can be seen from the above that the size of the muffling frequency is related to the cross-sectional area and length of the ventilation pipe 3 and the volume of the muffling cavity 12. When the cross-sectional area and length of the ventilation pipe 3 are constant, the larger the volume of the muffling cavity 12, The smaller the muffling frequency, when the volume of the muffling cavity 12 is constant, the larger the cross-sectional area and the smaller the length of the ventilation pipe 3, the higher the muffling frequency. When the automatic noise reduction device is determined, the cross-sectional area and length of the ventilation pipe 3 are determined. Therefore, there is a quantitative relationship between the volume of the muffler cavity 12 and the muffler frequency. Knowing the frequency to be muffled can determine that the baffle 2 is located in the accommodating cavity The position of 11 determines the volume of the muffler cavity 12. Similarly, it is known that the position of the partition 2 is located in the accommodating cavity 11, and the volume of the muffler cavity 12 can be determined to determine the size of the frequency to be muffled.

Referring to FIG. 7 , it can be known from the calculation formula of the muffler frequency that the size of the muffler frequency is related to the cross-sectional area and length of the ventilation pipe 3 and the volume of the muffler cavity 12. Therefore, for the convenience of calculation, the accommodating cavity 11, muffler cavity 12 and The ventilation pipes 3 are all set to a regular shape, the shape of the accommodating cavity 11 and the muffler cavity 12 are consistent, and the muffler cavity 12 can be set to a cube or a cuboid, or a shape with a triangular bottom surface, or a cylinder. Similarly, , the ventilation pipe 3 can also be set as a cube or a rectangular parallelepiped, can also be set as a shape with a triangular bottom surface, and can also be set as a cylinder. Since the partition plate 2 slides along the first direction of the accommodating cavity 11, the shape of the partition plate 2 is also consistent with the shapes of the accommodating cavity 11 and the muffler cavity 12, and the shapes of the muffler cavity 12 and the ventilation pipe 3 can be combined arbitrarily, and this does not matter. Restriction, the present application provides a reference solution, the accommodating cavity 11 , the anechoic cavity 12 and the partition plate 2 are arranged in a cube or cuboid structure, and the ventilation pipe 3 is selected as a cylindrical structure extending to the outside of the housing 1 .

In other embodiments provided in this application, referring to FIGS. 6 and 7 , the placement direction of the automatic noise reduction device also determines the number of parts of the automatic noise reduction device. When the partition plate 2 in the automatic noise reduction device is perpendicular to the ground , the partition plate 2 is not affected by gravity during the movement process, the partition plate 2 can be sealed and slidable along the first direction of the accommodating cavity 11, and the muffler frequency can be reduced by changing the volume of the muffler cavity 12. However, when the partition 2 is not perpendicular to the ground, there will be gravity during the movement of the partition 2. The current generated by the electromagnet 42 needs to overcome the gravity first, and then the partition 2 can be driven to slide along the inner wall of the accommodating cavity 11, resulting in Part of the invalid work is eliminated, and the relationship between the muffler frequency and the volume of the muffler cavity 12 is inconvenient to calculate. In order to overcome gravity and reduce the influence of gravity on the automatic noise reduction device, a recovery assembly is arranged in the automatic noise reduction device, so that the partition plate 2 is located at the position of the accommodating cavity 11 .

Further, as shown in FIG. 7 , the function of the recovery component is to overcome the influence of the gravity of the partition plate 2 on the automatic noise reduction device, but the partition plate 2 itself also needs to slide along the inner wall of the accommodating cavity 11. Therefore, the recovery component requires both To overcome the influence of the gravity of the partition plate 2 on the calculation result, it is also necessary to slide the partition plate 2 along the first direction on the inner wall of the accommodating cavity 11. Therefore, the recovery component can be an elastic piece, and the elastic piece is arranged in the muffler cavity 12. The first end of the elastic member is fixed on the partition plate 2 , and the second end is fixed on the side of the muffler cavity 12 away from the partition plate 2 . Of course, if the accommodating cavity 11 is in a closed state, the elastic member can also be arranged in the accommodating cavity 11 that is not located in the muffler cavity 12, the first end of the elastic piece is fixed on the partition 2, and the second end is fixed away from the muffler cavity. On the inner wall of the accommodating cavity 11 of 12 , both methods can be satisfied, and the elastic member extends and compresses along with the partition plate 2 .

7 , the elastic member can be elastically deformed, and the elastic member can be any component with a telescopic function, such as a spring 5, a damper, a reed, rubber, etc. When the elastic member is a spring 5, the elastic force of the spring 5 is easy to calculate , only related to the stiffness coefficient and the elongation length of the spring 5. In the process of calculating the force, it is easy to select the size and type of the spring 5, and there are many types of the spring 5, for example, the torsion spring 5, the torsion spring 5, the compression spring 5 Spring 5 etc.

As shown in FIG. 7 , when the elastic force of the spring 5 is equal to the gravity of the partition plate 2, the partition plate 2 is in a balanced state. At this time, the partition plate 2 is in the initial position. When the controller 41 receives the signal from the external environment, the electromagnetic The iron 42 generates electromagnetic force to drive the partition 2 to slide along the inner wall in the first direction of the accommodating cavity 11. According to the different external environmental signals, it can slide to the first position 21, or to the second position 22, or to the second position 22. Slide to the third position 23, this time. The partition 2 is still in a state of balance, and the partition 2 changes from the previous balance of gravity and elasticity to a balance between gravity, elasticity and elasticity. The gravity is generated by the partition 2 itself, and the elastic force only needs to be based on the extension of the spring The length or compression can be calculated, so the magnitude of the required electromagnetic force can also be calculated.

Referring to FIG. 7 , if the volume of the muffler cavity 12 and the accommodating cavity 11 is too large, the volume of the partition plate 2 will also increase accordingly, resulting in a corresponding increase in the number of springs 5 . In order to maintain the force balance of the partition plate 2 And the sliding is more stable. When the number of springs 5 is multiple, the springs 5 should be evenly distributed in the muffler cavity 12 .

In other embodiments provided in this application, referring to FIG. 7 , the driving device includes a controller 41 and an electromagnet 42 , the controller 41 generates current according to the external environment or the signal of the frequency to be silenced, and drives the electromagnet 42 to generate electromagnetic force Drive the baffle 2 to slide along the first direction of the accommodating cavity 11. The baffle 2 needs to be able to induce electromagnetic force, so the baffle 2 needs to be made of magnetically permeable material. Among them, the nature can be divided into paramagnetic substances according to their different magnetic properties , diamagnetic substances, ferromagnetic substances, antiferromagnetic substances and ferrimagnetic substances. Among them, ferromagnetic substances and ferrimagnetic substances belong to ferromagnetic substances, and the two types of substances are collectively referred to as magnetic materials. Therefore, the separator 2 is made of ferromagnetic substances and metal magnetic conductive materials. The separator 2 can also be set as a permanent magnet, the permanent magnet can provide constant magnetic field strength, coercive force, and the residual magnetic induction intensity and the maximum magnetic energy level are large, which can provide a strong magnetic field and electromagnetic force with a small volume for attraction. or exclusion.

To this end, the present application also provides a specific example. In the process of vehicle model development, the driver subjectively evaluates a feeling of pressure on the ear under certain rotational speeds under acceleration conditions. After empirical analysis, this phenomenon is the second-order excitation of the engine. The second-order excitation frequency formula of the engine is as follows:

Among them, n is the rotational speed of the engine.

It can be known from the above formula that the engine speed increases from 700rpm to 6000rpm, and the corresponding second-order excitation frequency is 23.3Hz to 200Hz. The mode of the acoustic cavity of the passenger compartment is determined by the size of the passenger compartment, usually 40Hz to 200Hz for passenger cars. 80Hz.

Under the acceleration condition, as the engine speed increases, the second-order excitation of the engine will always sweep through the acoustic cavity mode of the passenger compartment, resulting in the generation of the first roar. state resonance, resulting in the generation of a second roaring sound. Referring to FIGS. 3 and 7 , in order to improve the invention, the automatic noise reduction device provided by the embodiment of the present application is placed in the muffler headrest 63 of the automobile, and the muffler frequency is set to the first position 21 and the second position according to the vehicle speed. 22. Figure 8 shows the change curve of the roaring sound when the automatic noise reduction device is placed in the headrest and without the automatic noise reduction device. Curve 1 is the curve diagram of the roaring sound without the noise reduction device; The curve diagram of the roaring sound of the automatic noise reduction device, wherein, when the partition 2 is in the first position 21, the frequency of the first roaring sound is significantly reduced, and when the partition 2 is in the second position 22, the second roaring sound is in the second position 22. The frequency is significantly reduced, and the automatic noise reduction device provided in the embodiment of the present application can not only be used to solve the roaring sound problem, but also can be used as a rapid verification method for the roaring sound frequency, automatically adjust the position of the partition 2, and change the frequency of the muffler cavity 12. Evaluate the pressure on the ear of the roaring sound.

The above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

Claims (15)

1. an automatic noise reduction device, is characterized in that, comprises: a housing, wherein a receiving cavity extending along the first direction is formed in the housing; a partition, the partition is arranged in the accommodating cavity, the partition extends along a plane perpendicular to the first direction, and the edge of the partition is in sealing and sliding connection with the inner wall of the accommodating cavity; A vent pipe is arranged on the housing and communicates with the accommodating cavity. In the cavity enclosed by the baffle and the accommodating cavity, the vent pipe is arranged as a muffler cavity, and the vent pipe is used to The muffling cavity is communicated with the outside world; A driving assembly, the driving assembly is fixed on the casing, and the driving assembly is used to drive the partition plate to slide in the muffler cavity along the first direction, so as to change the volume of the muffler cavity. 2 . The automatic noise reduction device according to claim 1 , wherein the driving component comprises a controller and an electromagnet, and the controller is used to control the electromagnet to generate electromagnetic force according to an external environment, so that the The electromagnet drives the baffle to slide in the muffler cavity along the first direction. 3 . The automatic noise reduction device according to claim 2 , wherein the partition plate is made of a metal magnetic conductive material. 4 . 4 . The automatic noise reduction device according to claim 2 , wherein the partition is a permanent magnet, and the controller is used to control the electromagnet to generate an electromagnetic force according to an external environment, so as to attract or repel the partition. 5 . plate. 5 . The automatic noise reduction device according to claim 2 , wherein the automatic noise reduction device further comprises a restoring component, and the restoring component is used to make the baffle be located at an initial position in the accommodating cavity. 6 . 6 . The automatic noise reduction device according to claim 5 , wherein the restoring component comprises an elastic member, the elastic member is located in the muffler cavity, and the first end of the elastic member is fixed on the insulating spacer. 7 . On the plate, the second end is fixed on the inner wall of the muffler cavity away from the partition plate. 7. The automatic noise reduction device according to claim 6, wherein the elastic member is a spring. 8 . The automatic noise reduction device according to claim 7 , wherein there are multiple springs, and the springs are evenly distributed in the muffler cavity. 9 . 9 . The automatic noise reduction device according to claim 2 , wherein the ventilation pipe is a cylindrical structure elongated outside the outer casing. 10 . 10 . The automatic noise reduction device according to claim 9 , wherein the controller is configured to control the magnitude of the electromagnetic force generated by the electromagnet according to the noise reduction frequency required by the external environment, wherein the noise reduction frequency The calculation formula is as follows:

Wherein, f represents the anechoic frequency; A represents the cross-sectional area of the ventilation pipe; L represents the length of the ventilation pipe; and V represents the volume of the muffler cavity. 11. A seat, characterized by comprising the automatic noise reduction device according to any one of claims 1 to 10, the automatic noise reduction device being arranged in the seat. 12 . The seat according to claim 11 , wherein the seat comprises a base, a backrest and a headrest, and the automatic noise reduction device is provided in the base, the backrest and the headrest. 13 . one or more of them. 13. A vehicle, characterized in that, comprising: frame; The seat of any one of claims 11 or 12, which is provided within the frame. 14 . The vehicle according to claim 13 , wherein the frame comprises an outer frame cylinder, and the automatic noise reduction device is arranged in the outer frame cylinder. 15 . 15. The vehicle according to claim 13, characterized in that it comprises a wheel, and the automatic noise reduction device is arranged in the wheel.

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