KR100961730B1 - Inhalation apparatus having noise reduction structure - Google Patents

Abstract

The present invention relates to a noise reduction filter for reducing noise generated when driving an engine of an automobile and an intake apparatus having the same.

Intake apparatus provided with a noise reduction filter according to an embodiment of the present invention includes an air purification unit having an air purification filter therein; A suction duct connected to the air purifier to suck air; A supply duct connected to the air purifying unit and discharged to supply air to the engine; A main resonator connected to the air purifier by a connection duct to reduce noise generated by driving of the engine; It is provided in the connection duct, it may be configured to include a noise reduction filter made of a ventilation structure having a predetermined volume capable of the flow of air to reduce the noise generated by the driving of the engine.

According to the above configuration, the present invention can be applied to an intake apparatus having a structure for reducing noise inside an engine room that is spatially constrained, such as a small vehicle. It can be obtained, and can be applied without modifying the structure of the existing intake apparatus.

Car, intake, engine, engine room, noise,

Description

Intake device with noise reduction structure {INHALATION APPARATUS HAVING NOISE REDUCTION STRUCTURE}

The present invention relates to a noise reduction filter for reducing noise generated when driving an engine of an automobile and an intake apparatus having the same.

In general, an automobile is provided with an intake apparatus for supplying air required for driving the engine. Air sucked in this way is supplied to the engine together with fuel to enable combustion (explosion stroke) of the engine, and noise generated by combustion (explosion stroke) is discharged through the engine exhaust port together with exhaust gas, and a muffler is used. Therefore, the noise emitted with the exhaust gas is reduced to be discharged to the outside.

On the other hand, the noise reflected by the noise generated by the combustion of the engine is not discharged through the exhaust port due to the time difference is reflected, it is transmitted to the intake apparatus for air purification through the air supply. As such, the noise flowing back to the intake apparatus occupies a large proportion among the various noises generated in the vehicle, and thus it is required to reduce it as much as possible.

As described above, in order to reduce the noise generated by the echo, a resonator is conventionally attached to the air purification unit to reduce the noise. However, since the noise generated by the characteristics of the engine is different from one engine to another, the noise must be designed in consideration of the structural characteristics of each engine and the vehicle. In order to reduce noise in some specific frequency bands, it is advantageous to increase the capacity of the resonator as much as possible. In order to design a noise suitable for a specific frequency band, it is advantageous to arrange each resonator for each frequency band characteristic.

However, the intake apparatus disposed in the engine compartment is limited by the noise design due to the arrangement design of each component. In other words, the resonator cannot be applied to the required amount of capacity, or it is often impossible to apply various plural resonators. Furthermore, in the case of a small vehicle, the vehicle should be designed with an appropriate weight and volume in order to maximize the efficiency of the engine power, in which case the size of the engine compartment is limited. As the size of the engine room becomes smaller, it becomes more difficult to apply a resonator of a required capacity, and in particular, it may become impossible to apply an additional plurality of resonators.

The present invention is made by recognizing at least one of the needs or problems occurring in the conventional noise reduction filter and the intake apparatus having the same.

One object of the present invention is to reduce the noise generated when the engine is driven.

Another object of the present invention is to enable the intake apparatus made of a structure for reducing noise can be applied in a state that is hardly restricted by the space inside the engine room.

Still another object of the present invention is to reduce noise of a wide frequency band even if a resonator for noise reduction is configured with a minimum capacity.

Another object of the present invention is to enable the noise of a specific frequency band to be corrected in decibels below a certain level.

Still another object of the present invention is to reduce noise even when a low specification resonator is applied according to the structural design specification of the engine room.

It is another object of the present invention to reduce noise (sound waves) of a specific frequency band without additionally providing a resonator requiring a separate space or increasing the capacity of the resonator's echo space.

Another object of the present invention is to enable a configuration for efficient noise reduction in the engine room consisting of a narrow space, such as a small vehicle.

Still another object of the present invention is to enable the application of a noise reduction filter without modifying the structure of a conventional intake apparatus.

An intake apparatus having a noise reduction structure related to an embodiment for realizing at least one of the above problems may include the following features.

The present invention is basically composed of a ventilation structure having a certain volume to enable the flow of air is configured to reduce the noise generated by the driving of the engine.

Intake apparatus according to an embodiment of the present invention includes an air purifying unit provided with an air purification filter therein to filter foreign matter; A suction duct connected to the air purifying unit and sucking air supplied to the engine; A supply duct connected to the air purifying unit and discharged to supply the air from which the foreign matter is removed by the air purification filter to the engine; A main resonator provided to connect the flow path by the air purifying unit and the connection duct to reduce noise generated by driving of the engine; It is provided in the connection duct, it may be configured to include a noise reduction filter made of a ventilation structure having a predetermined volume capable of the flow of air to reduce the noise generated by the driving of the engine.

In this case, the noise reduction filter may be configured such that the movement time of the sound wave is delayed so that sound waves (noise) and extinction interference reflected from the main resonator are generated.

On the other hand, the noise reduction filter may be configured so that the noise is converted into thermal energy to reduce the noise.

On the other hand, the noise reduction filter is to delay the passing time of the sound waves (noise), so that the sound waves and extinction interference reflected from the main resonator is generated, and the noise passing through the noise reduction filter composed of the ventilation structure is converted into thermal energy due to transmission loss. It may be configured to be switched so that noise can be reduced.

In this case, the noise reduction filter may be formed in an annular plate structure in which a flow path is formed in the center, or alternatively, may be formed in a cylindrical structure in which a flow path is formed in the center.

On the other hand, the noise reduction filter of the cylindrical structure may be configured to be further provided with an expansion portion is formed in a progressively larger diameter in the end direction from the center of the flow path so that the diameter of one end position of the flow path is formed larger than the diameter of the other end position. .

On the other hand, the noise reduction filter may be configured to be provided with a support portion to fix the position mounted in the interior of the connection duct to the body and the rim of the body consisting of an annular plate structure is formed in the center.

On the other hand, the noise reduction filter and the mounting member coupled to the connection duct; Coupled to the mounting member, the center is formed of an annular plate structure formed with a flow path, it may be configured to be made of a body consisting of a ventilation structure having a certain volume capable of the flow of air.

In addition, the suction duct may include a first sub-resonator or a branch resonator, or both the first sub-resonator and the branch resonator. In this case, a noise reduction filter may be further provided in the first sub-resonator or the branch resonator.

On the other hand, the supply duct may be provided with a second sub-resonator. In this case, the second sub-resonator may further include a noise reduction filter.

As described above, according to the present invention, it is possible to efficiently reduce the noise generated when the engine is driven.

In addition, according to the present invention, the intake apparatus made of a structure for reducing noise can be applied in a state that is hardly restricted by the space inside the engine room.

In addition, according to the present invention, even when a low specification resonator is applied according to the structural design specification of the engine room, the noise can be sufficiently reduced.

In addition, according to the present invention, it is possible to reduce the noise of a specific frequency band without additionally providing a resonator requiring a separate space or increasing the capacity of the resonator's echo space.

In addition, according to the present invention, it is possible to configure for efficient noise reduction in the engine room consisting of a narrow space, such as a small vehicle.

Further, according to the present invention, it is possible to apply the noise reduction filter without modifying the structure of the conventional intake apparatus.

In order to help the understanding of the features of the present invention as described above, it will be described in detail with respect to the intake apparatus having a noise reduction structure related to the embodiment of the present invention.

Hereinafter, exemplary embodiments will be described based on embodiments best suited for understanding the technical characteristics of the present invention, and the technical features of the present invention are not limited by the illustrated embodiments, It is to be understood that the present invention may be implemented as illustrated embodiments. Accordingly, the present invention may be modified in various ways within the technical scope of the present invention through the embodiments described below, and such modified embodiments fall within the technical scope of the present invention. In order to facilitate understanding of the embodiments to be described below, in the reference numerals shown in the accompanying drawings, among the constituent elements which perform the same function in each embodiment, the related constituent elements are indicated by the same or an extension line number.

Embodiments related to the present invention are based on a ventilation structure having a constant volume capable of allowing air to flow to reduce noise generated by driving of the engine.

1 shows an intake apparatus 100 having a noise reduction structure according to an embodiment of the present invention.

The intake apparatus 100 is basically provided with an air purifying unit 110 to remove foreign substances in the air supplied for the combustion process (explosion stroke) of the engine (not shown). The air purifier 110 is provided with an air purifying filter 111 in the inner accommodating part 110a such that air introduced into the accommodating part 110a of the air purifying part 110 is the air purifying filter 111. It is configured to be filtered by and supplied to the engine.

At one position of the air purifier 110, an intake duct 120 having a flow path 120a formed therein is connected to allow the outside air to flow therein so that the air may be filtered by the air purification filter 111. In order to be introduced into the interior of the receiving portion (110a), and to the other position of the air purification unit 110, the air filtered by the air purification filter 111 is supplied to the engine flow path (130a) therein Supply duct 130 is formed is connected.

On the other hand, the primary noise generated by the explosion stroke of the engine is discharged to the outside through the exhaust of the engine. On the other hand, the secondary noise (noise due to reverberation) generated by the reverberation of the primary noise generated by the explosion stroke of the engine is present inside the engine even after the explosion stroke due to time difference. Noise is emitted to the outside along the flow path of air for the next explosion stroke. That is, the secondary noise is discharged to the air purification unit 110 through the flow path 130a of the supply duct 130.

In order to reduce the secondary noise discharged to the outside as described above, the air purifier 110 is provided such that a main resonator 140 is connected by a connection duct 141 in which a flow path 141a is formed. .

Noise transmitted from the engine to the air purification unit 110 using air as a medium flows into the main resonator 140. An echo space 140a is formed in the main resonator 140 so that sound waves of noise are echoed so that extinction interference between traveling waves and reflected waves can occur. The echo space 140a may be designed by measuring the frequency of the generated noise in consideration of the amount (strength) of the noise flowing into the main resonator 140. That is, the volume of the internal reflection space 140a of the main resonator 140 may be determined according to the amount (intensity) of the noise and / or the band of the frequency.

The noise reduction filter 150 may be further provided in one moving space of the air flowing into the main resonator 140. The noise reduction filter 150 may be configured to reduce noise in a frequency band that is not reduced by the main resonator 140 and / or that the amount of reduction is not sufficient.

As an example of such a configuration, as illustrated in FIG. 2, the flow path of the connection duct 141 connecting the space of the receiving portion 110a of the air purification unit 110 and the echo space 140a of the main resonator 140 is shown. The noise reduction filter 150 may be disposed at 141a.

The noise reduction filter 150 is formed of an aerenchyma such that noise from the interior of the accommodating part 110a is transmitted to the echo space 140a of the main resonator 140. It may be. The ventilation structure may be formed of a structure in which a complex micro-channel may be formed, and may be configured to allow the interference of sound waves and extinction interference by acting to delay the movement speed of noise (sound waves) passing through the ventilation tissue. . In this case, when the space of the engine compartment of the vehicle is not enough or the capacity of the echo space 140a of the main resonator 140 due to a structural problem, the ventilation structure by the action of the noise reduction filter 150 Sound waves passing through can be converted into a state where extinction interference is possible. On the other hand, if the specification of the main resonator 140 can reduce the main noise, but the additional noise can not be reduced, the sound wave that is the additional noise passes through the noise reduction filter 150, the echo space 140a It is also possible to make the sound wave and extinction interference reflected from the transition into a state possible.

The noise reduction filter 150 may be configured so that the sound waves passing through the ventilation tissue is converted into thermal energy by the ventilation tissue to reduce the noise. For example, while the sound wave transmitted as air as a medium passes through the ventilation system, the sound wave may be rubbed with the surface of the noise reduction filter 150 forming the ventilation system, and converted into thermal energy to reduce noise.

As described above, the noise reduction filter 150 configured to have a ventilation structure may be made of a material such as a nonwoven fabric made of paper and / or fiber.

3A to 3C show examples of various configurations of the structure of the noise reduction filter 150. The structure of the noise reduction filter 150 is not limited to the examples of the illustrated structure, but the frequency band and / or intensity of the generated noise (sound wave), and the specification of the echo space 140a of the main resonator 140. It can be made in a variety of sizes and structures.

Referring to the structural characteristics of the noise filter 150 shown as an example, as shown in Figure 3a, the noise reduction filter 150 is a body 150 made of an annular plate structure in which a flow path 152 is formed in the center It may be composed of). In this case, the body 151 of the noise reduction filter 150 may be made of a ventilation structure capable of changing the traveling speed of the sound waves and / or the thermal energy as mentioned above.

The noise reduction filter 150 having the annular plate structure may be disposed in the flow path 141a of the connection duct 141 through which sound waves flow into the echo space 140a of the main resonator 140. In this case, the fixing part 141b is provided inside the flow path 141a so that the position where the noise reduction filter 150 is disposed may not be changed due to vibration and / or shock caused by driving of the vehicle. You may. In this case, the noise reduction filter 150 whose position is fixed by the fixing unit 141b is integrated into the flow path 141a of the connection duct 141 by the insert injection method. Alternatively, the connection duct 141 and the noise reduction filter 150 may be manufactured by mounting the assembly after manufacturing.

On the other hand, as shown in Figure 3b, the noise reduction filter 150 may be composed of a body 151 having a cylindrical structure in which the flow path 152 is formed in the center. Even in this case, the body 151 of the noise reduction filter 150 may be formed of a ventilation structure capable of changing the speed of sound wave and / or switching of thermal energy.

The noise reduction filter 150 having the cylindrical structure may be disposed in the flow path 141a of the connection duct 141 through which sound waves flow into the echo space 140a of the main resonator 140. In this case, the noise reduction filter 150 may be coupled to the flow path 141a of the connection duct 141 so that the noise reduction filter 150 may be caused by vibrations and / or shocks according to driving of the vehicle. It can also be comprised so that attachment | positioning may not change. On the other hand, the noise reduction filter 150 may be mounted to be fixed to the flow path (141a) by a bonding member (not shown).

On the other hand, as shown in Figure 3c, the noise reduction filter 150 may be composed of a body 151 made of a cylindrical structure in which a flow path 152 is formed in the center. In this case, the flow path 152 of the noise reduction filter 150 has an expanded portion 152a in which a cross-sectional area of the flow path 152 is gradually enlarged in a direction toward the end so that one end may have a diameter wider than the other end. May be further provided. In this case, the expansion unit 152a may be disposed to face the direction in which sound waves are introduced into the echo space 140a, or may be disposed to face the direction in which sound waves are echoed and emitted from the echo space 140a.

And, even in this case, the body 151 of the noise reduction filter 150 may be made of a ventilation structure capable of changing the speed of sound wave and / or the conversion of thermal energy. In addition, the noise reduction filter 150 is to be coupled to the flow path 141a of the connection duct 141, so that the noise reduction filter 150 is disposed by vibration and / or impact according to the driving of the vehicle. It may be configured to be mountable so that the position to be changed does not change. On the other hand, the noise reduction filter 150 may be mounted to be fixed to the flow path (141a) by a bonding member (not shown).

As another structural configuration of the noise reduction filter 150, as shown in FIGS. 4A and 4B, a body 150 having an annular plate structure in which a flow path 152 is formed in the center is provided. It may be made of a structure in which the support portion 153 is further provided in the border region of the body 150. Even in this case, the body 151 of the noise reduction filter 150 may be made of a ventilation structure capable of changing the traveling speed of the sound wave and / or the conversion of thermal energy as mentioned above.

In addition, the support part 153 provided at the edge position of the body 150 may be in contact with the inner surface of the flow path 141a when disposed in the flow path 141a of the connection duct 141, for example, as a flange structure. It can be made of a structure having a constant area. On the other hand, the support 153 may be made of a ventilation structure capable of changing the traveling speed of the sound waves and / or thermal energy, such as the body 150, or simply the body 151 is fixed to the interior of the flow path (141a) It may be made of a material having a structure so as to enable a simple supporting action. On the other hand, the support 153 may be configured integrally with the body 151, or may be made of a separate component from the body 151 to be combined.

As another example of the structural configuration of the noise reduction filter 150, as shown in Figures 5a and 5b, it may be made of a structure detachable to the connection duct 141. In this case, the noise reduction filter 150 is provided with a body 150 having an annular plate structure in which a flow path 152 is formed in the center, and the body 150 is disposed at one end of the connection duct 141. It may be configured to be provided in the mounting member 155 is made to be detachable. Even in this case, the body 151 of the noise reduction filter 150 may be made of a ventilation structure capable of changing the traveling speed of the sound wave and / or the conversion of thermal energy as mentioned above.

In the embodiments related to the noise reduction filter 150, the flow path 152 is formed in the body 151 formed of a ventilation structure capable of changing the speed of sound wave and / or switching the thermal energy, but it is described as an example. The body 151 of the noise reduction filter 150 may not form a separate flow path according to a frequency band of noise to be reduced because the body 151 itself is made of a ventilation structure.

6 shows a configuration of an intake apparatus 100 according to another embodiment of the present invention. Also in this case, as in the embodiment shown in FIG. 1, the intake apparatus 100 includes a main in which an air intake unit 110 includes an intake duct 120, a supply duct 130, and a noise reduction filter 150. Resonator 140 is provided. In addition, the noise reduction filter 150 may be configured to reduce noise introduced into the main resonator 140 as configured as described above.

In addition, as shown in FIG. 7A, the suction device 100 may further include a first sub-resonator 160 in the suction duct 120. The first sub-resonator 160 is suctioned by a connection duct 161 having a flow path 161a which is connected to the flow path 120a of the suction duct 120 so that noise may flow from the suction duct 120. It may be configured to be connected with the duct 120. In addition, the first sub-resonator 160 may be configured such that a reflection space 160a is provided therein so that noise introduced into the interior may be extinguished by offset interference. In this case, the echo space 160a provided by the first subregulator 160 has a specific frequency at which the noise is not reduced or is not sufficiently reduced by the main resonator 140 and the noise reduction filter 150. It may be provided to reduce the noise of the band, if the noise can be reduced to the desired specifications by the main resonator 140 and the noise reduction filter 150, the first sub-resonator 160 is The suction duct 120 may not be provided.

On the other hand, the suction duct 120 may be further provided with a branch resonator (branch resonator; 170). The branch resonator 170 is configured such that the echo space 170a itself provided therein is directly connected to the flow path 161a of the suction duct 120 to reduce noise of a specific frequency band. The echo space 170a of the branch resonator 170 may be configured such that the internal space is formed in a zigzag form unlike other resonators. The branch resonator 170 may also be provided by the main resonator 140 and the noise reduction filter 150 to reduce noise of a specific frequency band in which noise is not reduced or a sufficient reduction is not achieved. If the noise can be reduced to a desired specification by the main resonator 140 and the noise reduction filter 150, the branch resonator 170 may not be provided in the suction duct 120.

The branch resonator 170 may be provided together with the first sub-resonator 160 or only one of the branch resonators 170 according to the frequency band of the generated noise.

On the other hand, as shown in Figure 7b, the suction device 100 may further include a second sub-resonator (180) at any one position of the supply duct 130. The second sub-resonator 180 is suctioned by a connection duct 181 in which a flow path 181a is formed to be connected to the flow path 130a of the supply duct 130 so that noise may flow from the supply duct 130. It may be configured to be connected with the duct 120. In addition, the second sub-resonator 180 may be configured such that the echo space 180a is provided therein so that the noise introduced into the second sub-resonator 180 may be extinguished by the offset interference.

At least one or more of the resonators 160, 170 and 180, which may be configured as described above, may further include a noise reduction filter 150 as described above. That is, when the noise of any particular frequency band is not reduced by the resonator (140, 160, 170, 180) or the reduction efficiency is not enough, it may be configured to reduce the noise by applying the noise reduction filter 150. On the other hand, if the space to which the resonator should be provided is restricted in order to reduce the noise of a specific frequency band and the installation of the resonator is not sufficient, for example, the echo space may not be made of sufficient capacity (volume) or at all. In the case where it is impossible to install a specific resonator, the noise reduction filter 150 may be applied to reduce noise.

The intake apparatus 100 shown in FIG. 6 may be configured to be as shown in FIGS. 8A and 8B. That is, the suction duct 120 provided to introduce the air required for the explosion stroke of the engine may be detachably connected to the air purifier 110, and in this case, the suction connected to the air purifier 110. An end portion of the duct 120 may further include an insertion portion 121 positioned at the accommodation portion 110a to allow the flow of air flowing in from the outside to uniformly pass through the air purification filter 111.

The air purifier 110 may include a lower case 110-1 and an upper case 110-2 so that the accommodating part 110 a can be formed therein. In this case, the lower case 110 is provided. -1) and the receiving portion (110a) formed by the upper case (110-2) may be provided to replace the air purification filter 111.

In addition, the supply duct 130 may be connected to another position of the air purifying unit 110 so as to be capable of supplying air in which foreign matter is filtered by the air purifying filter 111 to the engine. In this case, the end of the supply duct 130 connected to the air purification unit 110 is further provided with an insertion unit 131 located in the receiving unit 110a to filter foreign matter by the air purification filter 111. It is also possible to configure so that the flow of air is made uniform.

In addition, the connection duct 141 provided between the air purification unit 110 and the main resonator 140 may be detachably provided or may be integrally formed. In addition, when the noise reduction filter 150 described above is detachably configured at one end of the connection duct 141, the connection duct 141 is disposed between the air purification unit 110 and the main resonator 140. It may be detachably provided to facilitate the mounting of the noise reduction filter 150. In addition, the second sub resonator 180 provided in the supply duct 130 may be configured such that the supply duct 130 and the second sub resonator 180 are connected to each other by a detachable connection duct 181. Alternatively, the supply duct 130 and the second sub-resonator 180 may be connected in a single structure.

Meanwhile, the first sub-resonator 160 and / or the branch resonator 170 provided in the suction duct 120 may be configured to be integrally formed in the suction duct 120. For example, by way of injection molding or the like, the first sub-resonator 160 and the branch resonator 170 may be formed of a single structure, as shown.

9A to 9C are measured values of noise level generated when the engine is driven by the conventional intake apparatus 100 and measured values of noise level generated when the engine is driven by the intake apparatus 100 according to the embodiments of the present invention. A graph showing is shown.

In these graphs, the horizontal axis represents the drive RPM of the engine, and the vertical axis represents the decibel of the noise generated. And these graphs show the value which measured the noise according to the drive of a four cylinder engine. In this case, the 2nd, 4th, 6th, and 8th lines are lines representing noise generated by primary, secondary, tertiary, and quaternary echoes according to engine driving, respectively. Each of these noises must be suppressed to have decibels lower than the allowable value, and the noise structure must be designed so that the total noise summed up these noises retains the decibels lower than the total target order.

In this test, when the decibels that are higher than the allowable value are greatly increased, a noise design is needed to reduce the noise.However, when the decibels are close to the allowable value and there is no significant difference, the decibel which adds up the total noise is the total allowable value. Unless exceeded, it was accepted as acceptable.

As shown in Figure 9a, the line (2nd) indicating the noise generated by the first reflection is about 2,500 RPM and 4,200 RPM, when the engine is driven, it can be seen that the noise of decibels higher than the allowable value occurs, 4 The line 8th, which represents the noise generated by the differential echo, shows that when the engine is driven in the range of about 4,200 to 4,900 RPM, noise of decibels higher than the allowable value is generated. In addition, the line OA of the sum of these total noises is about 4,200 RPM, and when the engine is driven, it can be seen that the noise of decibels higher than the total allowable value is generated.

On the other hand, Figure 9b is a graph measuring the noise generated when driving the engine to which the intake apparatus 100 having a noise reduction structure (cylindrical structure) according to an embodiment of the present invention. As shown in Fig. 9B, the line 2nd representing the noise generated by the first reflection exceeds the allowable value at about 1,700 RPM, and the line 6th representing the noise generated by the third reflection is about 5,500. You can see that the RPM exceeds the allowable value. However, these noises can be seen that the number of times exceeding the allowable value is lower than that in the case of the general intake apparatus, and also it can be seen that the magnitude beyond the allowable value is small. Furthermore, it can be seen that the line OA of the total noise sum does not exceed the total allowable value.

On the other hand, Figure 9c is a graph measuring the noise generated when driving the engine is applied to the intake apparatus 100 having a noise reduction structure (cylindrical structure having an extension) according to another embodiment of the present invention. . As shown in FIG. 9C, it can be seen that the lines representing the noise generated by all the echoes are acceptable for the allowable value, and the line OA of the sum of the total noise not only exceeds the total allowable value, but also the tongue. It can be seen that it is significantly lower than the dissolved value.

It is understood that the application of the noise reduction filter 150 as described above enables a design to reduce noise without separately providing a resonator suitable for each noise source or increasing the capacity (volume) of the main resonator. Can be. That is, the noise reduction filter having the various structures described above may be appropriately applied to the noise of a specific frequency band to enable a design for noise reduction.

Not limited to the embodiment of the intake apparatus having the noise reduction structure described as described above, the embodiments may be configured by selectively combining all or part of the embodiments so that various modifications can be made. have.

1 is a configuration example schematically showing a structure of an intake apparatus having a noise reduction structure according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view schematically illustrating a state in which a main resonator including the noise reduction filter of FIG. 1 is connected to an air purifying unit.

3A is a perspective view schematically illustrating an example of a structure of the noise reduction filter provided in the connection duct and a cross-sectional view of an example schematically illustrating a state in which the noise reduction filter is disposed in the connection duct provided in the main resonator of FIG. 1.

3B is a perspective view schematically illustrating another example of a structure of the noise reduction filter provided in the connection duct and a cross-sectional view of another example schematically illustrating a state in which the noise reduction filter is disposed in the connection duct provided in the main resonator of FIG. 1; to be.

3C is a cross-sectional view of another example schematically illustrating a state in which a noise reduction filter is disposed in a connection duct provided in the main resonator of FIG. 1 and another example of a structure of the noise reduction filter provided in the connection duct. It is a perspective view showing.

Figure 4a is a perspective view schematically showing a structure of another noise reduction filter according to an embodiment of the present invention.

4B is a cross-sectional view of FIG. 4A.

Figure 5a is a perspective view schematically showing a structure of another noise reduction filter according to an embodiment of the present invention.

5B is an exploded cross-sectional view schematically illustrating a state in which the noise reduction filter of FIG. 5A is coupled to a connection duct.

6 is a configuration example schematically showing a structure of an intake apparatus having a noise reduction structure according to another embodiment of the present invention.

FIG. 7A is a cross-sectional view schematically illustrating a state in which the first sub-resonator and the branch resonator of FIG. 6 are connected to the suction duct.

FIG. 7B is a cross-sectional view schematically illustrating a state in which the second sub-resonator of FIG. 6 is connected to the air purifying unit.

8A is an exploded perspective view schematically illustrating the structure of the intake apparatus of FIG. 6.

FIG. 8B is a partial cross-sectional plan view schematically illustrating the structure of the intake apparatus of FIG. 6 assembled; FIG.

9A is a graph showing the degree of noise tested using a general intake apparatus.

Figure 9b is a graph showing the degree of noise tested using the intake apparatus with a noise reduction filter according to an embodiment of the present invention.

Figure 9c is a graph showing the noise level tested using an intake apparatus equipped with a noise reduction filter according to another embodiment of the present invention.

* Description of the main parts of the drawings *

100 ... intake 110 ... air purifier

110a ... Receptacle 111 ... Filter for air purification

120 ... suction duct

120a, 130a, 141a, 152,161a, 181a ... Euro

130 ... supply duct 140 ... main resonator

140a, 160a, 170a, 180a ... echo space 141,161,181 ... connection duct

150 ... noise reduction filter 151 ... body

152a ... extension 153 ... support

155 ... mounting member 155 b ... fixing part

160 ... First Sub Resonator 170 ... Branch Resonator

180 ... second sub-resonator

Claims (12)

An air purifying unit provided with an air purifying filter therein to filter foreign matters; A suction duct connected to the air purifier to suck air supplied to the engine; A supply duct connected to the air purifying unit and discharged to supply the air from which foreign substances have been removed by the air purifying filter to the engine; A main resonator provided to connect the flow path by the air purifying unit and a connection duct to reduce noise generated by driving of the engine; A noise reduction filter provided inside the connection duct and formed of a ventilation structure having a predetermined volume capable of flowing air, and configured to reduce noise by converting noise generated by driving of the engine into thermal energy; Intake apparatus, characterized in that configured to include. The intake apparatus according to claim 1, wherein the noise reduction filter is configured to delay a passing time of sound waves (noise) and to generate sound interference (noise) and extinction interference reflected from the main resonator. delete delete The intake apparatus according to claim 1, wherein the noise reduction filter has an annular plate structure having a flow path formed at the center thereof or a cylindrical structure having a flow path formed at the center thereof. The noise reduction filter of claim 5, wherein the cylindrical noise reduction filter further includes an expansion part having a diameter gradually increased in the end direction from the center of the flow path such that the diameter of one end position of the flow path is larger than the diameter of the other end position. Intake apparatus, characterized in that provided. The intake apparatus according to claim 1, wherein the noise reduction filter includes a support having a body formed of an annular plate structure having a flow path formed at the center thereof, and a support portion fixed to a position of the connection duct at the edge of the body. . The method of claim 1, wherein the noise reduction filter A mounting member coupled to the connection duct; The intake device is coupled to the mounting member, consisting of an annular plate structure having a flow path formed in the center, characterized in that made of a body consisting of a ventilation structure having a predetermined volume capable of the flow of air. The intake apparatus according to claim 1, wherein the suction duct is provided with a first sub-resonator or a branch resonator or with both a first sub-resonator and a branch resonator. 10. The intake apparatus of claim 9, wherein a noise reduction filter is further provided in the first sub-resonator or the branch resonator. The intake apparatus according to claim 1, wherein the supply duct is provided with a second sub-resonator. 12. The intake apparatus according to claim 11, wherein the second sub-resonator is further provided with a noise reduction filter.

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