JP2003182344A - Ventilating device having noise eliminator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilating device having a noise eliminator which can keep a stable noise eliminating performance extending to a long period of time at a low cost. <P>SOLUTION: This ventilating device having a noise eliminator is equipped with a frame main body 1, a sheet-form valve element 3 and the noise eliminator S. In this case, for the frame main body 1, a flange section 12 is extended on the outer periphery of a cylindrical section 11 on which a ventilation port 110 is formed. From the ventilation port, air in an automobile is discharged to the outside. The sheet-form valve element 3 is attached to the frame main body 1 in such a manner that the sheet-form valve element may cover the ventilation port 110, and open the ventilation port 110 in response to the increase of a pressure in the automobile. The noise eliminator S is equipped with a hollow box-forming section 2a and a communicating hole 13 which communicates the cylindrical section 11 with the inside of the hollow box 2. Then, the cylindrical section 11 is made to work as at least one wall surface of the hollow box 2, and the hollow box forming section 2a is integrated with the cylindrical section 11. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilator for a vehicle, which is provided to release the pressure in a vehicle compartment when a door of an automobile or the like is opened and closed, and relates to a ventilator with a muffler integrated with a muffler.

[0002]

2. Description of the Related Art Behind a bumper at the rear of an automobile, there is a ventilation device for releasing the pressure inside the vehicle when the door is opened and closed and for replacing air inside the vehicle while the vehicle is traveling. As shown in FIG. 9, the air that has entered from the front of the vehicle compartment or the like is exhausted intensively to the outside of the vehicle through the ventilation port 60 of the ventilation device. Frame body 6 forming the ventilation port 60
A sheet-like valve body 3 is attached to the seat-like valve body 3 and the sheet-like valve body 3 is opened or closed according to the pressure difference between the inside and outside of the vehicle to adjust the air volume when the door is opened or closed or while the vehicle is running. Here, when the sheet-shaped valve element 3 hits the sealing surface 69 of the frame body 6 during the opening / closing operation, a so-called rattling sound is generated. Since this pattering sound is felt as abnormal noise by rebounding repeatedly, a sound absorbing material 9 made of a porous material such as urethane slab is usually attached to the frame body 6 in a vehicle ventilation device.
If not set on the frame body 6, it has been provided on the body side.

[0003]

However, when the frame body 6 is provided with the sound absorbing material 9, there is a problem that the sound absorbing material 9 absorbs water during car washing, rainy weather, etc. even though it is covered by the bumper. there were. The sound-absorbing material 9 that has absorbed water has a problem that the sound-absorbing performance is drastically lowered, and in the case where the sound-absorbing material 9 is made of urethane foam, it is hydrolyzed. On the other hand, when the sound absorbing material 9 is attached to the body, the sound is diffused because the sound absorbing material 9 is separated from the ventilation port 60 that is the sound source, and the sound absorbing material 9 must be provided in a wide range to reduce the diffused sound. However, the cost increased.

The present invention solves the above problems, and an object of the present invention is to provide a ventilator with a silencer that can maintain stable sound absorption performance for a long time at low cost.

[0005]

[Means for Solving the Problems] In order to achieve the above object,
The gist of the invention according to claim 1 is to provide a frame main body in which a flange portion is provided on the outer periphery of a tubular portion formed with a ventilation port for exhausting vehicle interior air to the outside of the vehicle; A sheet-like valve body attached to the frame main body so as to open the ventilation port in accordance with the increase in temperature, and a communication part that connects the hollow body to the cylindrical portion and communicates the inside of the cylindrical portion with the hollow body. And a silencer, and a ventilation device with a silencer. The gist of the invention according to claim 2 is to provide a frame main body in which a flange portion is provided on the outer periphery of a tubular portion formed with a ventilation port for exhausting vehicle interior air to the outside of the vehicle; Sheet-like valve body attached to the frame main body so as to open the ventilation port in accordance with the increase of the height of the hollow box, and the hollow portion integrated with the tubular portion with the tubular portion supporting at least one wall surface of the hollow box. A ventilator with a muffler, comprising: a muffler including a box forming part and a communication hole that penetrates into the hollow box in the tubular part. The ventilator with a silencer according to claim 3 is the ventilator with a silencer according to claim 2, wherein the silencer is integrated with the tubular portion and the flange portion such that the tubular portion and the flange portion form a wall surface of the hollow box. It is characterized in that the hollow box forming portion and the tubular portion are provided with a communication hole penetrating into the hollow box.

According to the first aspect of the present invention, when a silencer having a communicating portion for connecting the hollow body to the tubular portion and for communicating the inside of the tubular portion with the hollow body is attached to the ventilation device, the principle of Helmholtz resonance is utilized. Then, desired frequency noise can be reduced.
According to a second aspect of the present invention, the muffler has a hollow box forming portion which is integrated with the hollow box so that the hollow part bears at least one wall surface of the hollow box, and a communication hole which penetrates the hollow box into the hollow box. With the above structure, the tube portion is shared by the silencer and the ventilation device, and the cost can be reduced.
Since the resonance type silencer is formed by the hollow box and the communication hole, it has a sound absorbing effect by itself and can exhibit stable sound absorbing performance unlike a sound absorbing material or the like. When the hollow box forming portion integrated with the tubular portion and the flange portion is used such that the tubular portion and the flange portion form the wall surface of the hollow box, the shape of the hollow box forming portion is used. Can be further simplified and cost reduction can be further promoted.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A ventilation device with a silencer according to the present invention will be described in detail below. 1 to 8 show an embodiment of a ventilator with a silencer according to the present invention. FIG. 1 is a perspective view thereof, FIG. 2 is a view taken along the line AA of FIG. 1, and FIG. 3 is a silencer attached to a frame body. FIG. 4 is a vertical cross-sectional view showing a state, FIG. 4 is a perspective view of a ventilation device with a silencer of another form, FIG. 5 is a vertical cross-sectional view in which the ventilation device with a silencer of FIG. 4 is attached to a vehicle body panel, and FIG. FIG. 7 is a perspective view of a ventilator with a muffler according to another embodiment, FIG. 7 is an explanatory diagram of the noise measuring device, and FIG. 8 is a graph of noise measurement values.

(1) Embodiment 1 This embodiment is a ventilator P with a silencer as shown in FIGS. 1 to 3, which comprises a frame body 1, a silencer S, a sheet-like valve element 3 and a sealing member 4. To do. A silencer S is integrated with a conventional ventilator in which a sheet-shaped valve element 3 is attached to the frame body 1. With a silencer in which a tubular portion 11 forming the ventilator forms a part of the silencer S It is a ventilation device P. In the ventilator P with a silencer, the tubular portion 11 of the frame body 1 and the silencer S are inserted into the body opening 50 of the vehicle body panel 5 provided at the rear part of the vehicle, and the frame body 1 is inserted from the vehicle outer side 51 with the seal member 4 interposed.
Is pressed against the passenger compartment side 52, and the claw projection 15 is attached to the body opening 50.
The ventilation device P with a silencer is assembled and fixed to the vehicle body panel 5 by passing through and being locked to the vehicle compartment side inner wall 52 of the vehicle body panel 5 (FIGS. 1 and 2).

The frame main body 1 is a synthetic resin molded product having a tubular portion 11 and a flange portion 12, both of which are integrally molded.
The tubular portion 11 has a rectangular tubular shape that can be inserted into the body opening 50, and the inside of the tubular portion 11 exhausts air inside the vehicle to the outside of the vehicle.
Becomes 10. A communication hole 13 is formed in the upper cylinder wall 11a of the cylinder portion 11.
Is provided. This communication hole 13 is provided with a silencer S which will be described later.
The inside of the hollow box O penetrates, and the inside of the body opening 50 communicates with the inside O of the hollow box. At the ventilation port 110, collar-shaped valve seal portions 112 to 114 project into the tubular portion 11,
The valve seal portions 112 to 114 form a descending inclined surface from the upper wall end of the tubular portion 11 on the vehicle interior side toward the lower wall end of the tubular portion 11 on the vehicle exterior side. Reference numeral 111 is a rib for partitioning the ventilation port 110, and reference numeral 14 is a drainer.

The flange portion 12 is an outward flange in which the outer peripheral edge of the cylinder portion 11 on the vehicle outer side is extended outward by a predetermined width. When the silencer ventilation device P is assembled to the vehicle body panel 5, the flange portion 12 is arranged outside the vehicle body panel 5 with the seal member 4 interposed.

The muffler S is a resonator provided with a communication portion (communication hole) for connecting the hollow body to the cylindrical portion 11 and communicating the inside of the cylindrical portion 11 with the hollow body. The hollow body may have any shape such as a hollow cylinder or a hollow prism. The hollow body is connected to the tubular portion 11 via the communication portion to form a resonator utilizing the Helmholtz resonance principle. The hollow body can be formed separately from the tubular portion 11 and can be connected to the tubular portion 11 via a communicating portion such as a communicating pipe. However, in the muffler S of the present embodiment, the hollow box forming portion 2a that is integrated with the tubular portion 11 by causing the tubular portion 11 to carry at least one wall surface of the hollow box 2 and the tubular portion 11 to the inside O of the hollow box. A resonance type resonator having a communication hole 13 penetrating therethrough. In the present embodiment, the hollow box forming portion 2a is a rectangular body having an opening on one side, and the opening surface is the cylindrical portion 1a.
The hollow box 2 which is the box body of the silencer S is formed by covering the upper cylindrical wall 11a of the unit No. 1 with the cylindrical unit 11. The box shape of the hollow box 2 is not limited to the hollow body such as a hollow prism like the hollow body. For example, the hollow box forming portion 2a having a bowl shape with one surface opened, and the opening surface may be covered with the upper cylindrical wall 11a of the cylindrical portion 11 to form the hemispherical hollow box 2 integrally with the cylindrical portion 11. The upper cylindrical wall 11a extends forward from the valve seal portion 112 like a visor as shown in FIG. 2 and has a larger area than other portions.
A larger hollow box 2 can be made using 1a. In FIG. 2, the lower surface opening of the rectangular box-shaped hollow box forming portion 2a is closed by the upper cylinder wall 11a to form a hexahedral hollow box 2. Hollow box 2 whose upper cylinder wall 11a is a hexahedron
Constitutes one wall surface of. After the opening peripheral edge Y of the hollow box forming portion 2a is brought into contact with the upper cylindrical wall 11a, the opening peripheral edge Y
Is ultrasonically vibrated by the ultrasonic horn 7 as shown in FIG. 3 and welded to the upper cylindrical wall 11a. The vibration energy generated from the ultrasonic vibrator and transmitted to the horn 7 is applied to the hollow box forming portion 2a, and the opening peripheral edge Y is thermally melted and welded to the upper cylinder wall 11a. The method of integrating the opening peripheral edge Y of the hollow box 2 with the upper cylinder wall 11a may be hot plate welding, vibration welding, or simply bonding with an adhesive, in addition to the ultrasonic welding. Since these are all post-processes, from the viewpoint of cost reduction, it is more preferable to use DIS (die slide injection) molding in which two parts are welded in the mold. DIS molding is an injection molding method developed by Japan Steel Works, Ltd.

Hollow box forming portion 2a and upper cylinder wall 11a
The hollow box 2 is completed almost at the center of the upper cylinder wall 11a by the integration with the above, and the communication hole 13 formed in the upper cylinder wall 11a penetrates into the hollow box O to form the resonance silencer S. . The so-called patter sound generated by the sheet-shaped valve body 3 hitting the valve seal portions 112 to 114 can be silenced even by the silencer S of the small-capacity hollow box 2 provided at the center of the upper cylindrical wall 11a by adjusting the diameter of the communication hole 13. The claw projections 15 located on the upper side are arranged on both sides of the hollow box 2. Although the number of the communication holes 13 in the present embodiment is one, the number and size of the communication holes 13 and the size of the hollow box 2 are determined according to the frequency at which sound is to be absorbed. The communication hole 13 may be formed in the upper cylinder wall 11a by post-processing, but the cost can be reduced by forming the communication hole 13 so as to correspond to the mold slide when the frame body 1 is molded. In addition,
Since the hollow box 2 is formed in the center of the upper tubular wall 11a, when the ventilation device P with a silencer is attached to the vehicle body panel 5, the hollow box 2 must also pass through the body opening 50 together with the tubular portion 11. No, body opening 50
As shown in FIG. 1, a portion 501 through which the hollow box 2 passes is deeply cut into a convex shape.

The sheet-like valve element 3 is attached to the frame body 1 such that the ventilation port 110 is covered and the ventilation port 110 is opened according to the increase of the pressure in the vehicle compartment. Or a thermoplastic elastomer sheet plate). Here, after the pin 18 standing on the upper valve seal portion 112 is set through a through hole formed in the vicinity of the upper edge of the sheet-like valve body 3, the pin head is attached to the frame body 1 by thermal caulking or the like. Attach (Fig. 2). The lid 32 is the ventilation port 1
The sheet-like valve element 3 covers the ventilation port 110 of the tubular portion 11 with the lid portion 32 when the vehicle is stopped or the like. The peripheral edge of the sheet-shaped valve element 3 is the valve seal portions 112 to 11.
4 to prevent foreign matter and the like from entering the vehicle interior from the outside. When the vehicle interior pressure becomes higher than the vehicle exterior pressure due to traveling or the like, the sheet-shaped valve body 3 tilts around the attachment portion of the pin 18 as a fulcrum and moves away from the ventilation port 110, so that ventilation in the vehicle interior can be performed. (See Figure 9). Sheet valve body 3
The method of attaching the same to the frame main body 1 is not limited to this, and may be, for example, a method of suspending by adopting the flap-shaped sheet-like valve body 3 of JP-A-7-179118. Alternatively, as disclosed in Japanese Patent Laid-Open No. 5-185491, mounting holes are provided in the upper seal portion at a predetermined interval, and mounting holes are also provided in the sheet-shaped valve body 3 corresponding to the mounting holes, so that the mounting boss serves as the sheet-shaped valve body. After being inserted into the mounting hole of No. 3 and further into the mounting hole of the upper sealing portion, the portion of the upper sealing portion exposed to the vehicle compartment side is mounted and fixed to the frame body 1 by thermal caulking or the like. You can also

The seal member 4 has a ventilation panel of a vehicle body panel 5.
Is a gasket that is attached to the passenger compartment side of the flange portion 12 of the frame body 1 when assembled and fixed. The seal member 4 is larger than the ventilation port 110 and has a flange portion 12.
It is a quadrangular frame-like body that is slightly smaller than the outer shape of. The sealing member 4 is made of foamed material such as rubber, urethane, polyethylene, etc., which has a high cushioning property in order to exert a sealing function. The seal member 4 is inserted into the body opening 50 of the vehicle body panel 5 from the outside of the vehicle.
The frame body 1 is pressed toward the vehicle compartment side so as to compress the seal member 4 with the intervening clearance, and as described above, the claw projection 15 passes through the body opening 50 and the vehicle compartment side inner wall 52 of the vehicle body panel 5.
The ventilation device P with a silencer is assembled and fixed to the vehicle body panel 5 by being locked.

(2) Embodiment 2 This embodiment is a ventilator P with a silencer as shown in FIGS. The hollow box forming portion 2a has a box shape in which two surfaces of the rectangular hexahedron are cut off, and more specifically, it has a shape without one side wall of the rectangular box. The hollow box forming portion 2a is configured such that the wall portion of the hollow box 2 is supported by the cylinder portion 11 and the flange portion 12, and thus the cylinder portion 11 is formed.
And the flange portion 12. The opening surface of the hollow box forming portion 2a is provided with an upper cylindrical wall 11a and a flange portion 12
The hollow box 2 is made by abutting and integrating them toward the. Then, the upper cylinder wall 11a of the cylinder portion 11
A communication hole 13 penetrating to the inside O of the hollow box is provided to form the resonance silencer S. In the second embodiment, two communication holes 13 are provided. The rest of the configuration is the same as that of the first embodiment, and its explanation is omitted.
The same reference numerals as those in the first embodiment indicate the same or corresponding parts. In addition, FIG. 6 is a ventilation device P with a silencer according to another embodiment in place of FIG.
2 is a perspective view showing the case where the hollow box 2 is manufactured by adopting the DSI (die slide injection) welding method. The hollow box forming portion 2a in which the two faces of the rectangular hexahedron are missing is used in the same manner, but a part of the hollow box 2 is mounted on the upper edge 123 of the flange portion 12. In this case, through holes 121 are provided at the four corners of the flange portion 12, the body opening 50 is covered with the silencer ventilation device P, and then the through hole 121 is used to provide a silencer ventilation device with a tapping clip or the like not shown. P will be fixed to the vehicle body panel 5. In the ventilator P with a silencer of FIG. 6, the drainer 14 is omitted.

(3) Noise Comparison Test Next, regarding the ventilator P with the silencer of the first embodiment and the ventilator with the silencer S removed therefrom, the sheet-shaped valve body 3
Since the sound pressure of so-called rattling sound accompanying the opening and closing operation of was measured comparatively, this will be described. The noise is measured by rotating the sheet-shaped valve element 3 in the front-back direction so as to open and close the ventilation port 110 to generate a rattling noise (FIG. 7), and ventilating the microphone so that the wind pressure during the valve element operation does not affect. The sound pressure was measured at a distance of about 10 cm from the device. Since mechanical sound is generated when rotating with a jig, it was done manually. Also, in order to prevent the variation due to manual work, the sound pressure measurement value is 10
The maximum value measured for 2 seconds was taken, the number of measurements n was performed 3 times, and the average value thereof was used as data. The result is shown in the graph of FIG.

The muffling characteristic of the perforated muffler S is obtained by the equation (1). f = (c / 2π) {P / (t + 0.8d) L} ^1/2 [Hz] (1) where, c is the speed of sound in the air, L is the air layer, and t is the silencer S.
The plate thickness, d is the diameter of the communication hole 13, and P is the aperture ratio of the perforated plate. In this comparative test, each value was set using the formula (1) in order to reduce noise below 200 Hz, and the measurement result also showed the resonator effect in the F zone in the vicinity thereof (FIG. 8). Regarding the noise in the passenger compartment, in recent years, it has become more beneficial to reduce the low frequency around 200 Hz because high frequency can be sufficiently reduced by an indoor sound absorbing material such as carpet. Also,
The conventional product with only a ventilation system has an overall value of 79.3 dB.
On the other hand, the product of the present invention of the ventilator P with a silencer also obtained a low noise effect with an overall value of 77.9 dB. It is difficult to directly suppress the vibration noise generated when the sheet-shaped valve element 3 hits the valve seal portions 112 to 114 of the frame body 1. According to the ventilator P with a muffler of the present invention, it is estimated that the sound pressure energy generated there is absorbed from the communication hole 13 and is diffusely reflected by the inside O of the hollow box to attenuate the sound pressure energy and reduce noise. It

(4) Effects The muffler-equipped ventilation device P configured as described above has the cylindrical portion 11
A hollow box 2 is formed by utilizing the upper cylindrical wall 11a of the above and the flange portion 12, and the ventilation port 1 is provided in the hollow box O.
Since the muffler S is provided with the communication hole 13 penetrating from the 10 side, noise countermeasures can be taken at low cost. It is sufficient to add the hollow box forming portion 2a to the conventional ventilation device and provide the communication hole 13. The hollow box 2 and the communication hole 13 form a resonance type silencer S to reduce noise. Therefore, the resonance type silencer S itself is provided with a sound absorbing action, and unlike the case where the sound absorbing material 9 is used, the influence of rainwater is reduced. Stable sound absorption performance can be maintained for a long time without worrying about deterioration. If the upper cylinder wall 11a is provided with the communication hole 13 as in the above-described embodiment, it is difficult for water to infiltrate even in the case of rainwater or car washing, and even if water is inundated, it is smoothly discharged, so that sound absorption is not lowered. Although the method of fixing the sound absorbing material 9 depends on tape adhesion or the like and there is a risk of peeling, there is no such concern. Furthermore, although the sound absorbing material 9 cannot adjust the target frequency, the ventilator P with a muffler has a communication hole 13
It can be easily handled by selecting the hole diameter. If a plurality of silencers S are provided, noise can be reduced by aiming at a plurality of frequencies.

The present invention is not limited to those shown in the above-mentioned embodiment, but can be variously modified within the scope of the present invention depending on the purpose and application. The shape, size, number, material and the like of the frame body 1, the silencer S, the hollow box 2, the hollow box forming portion 2a, the sheet-like valve body 3, the sealing member 4, etc. can be appropriately selected according to the application. In the embodiment, the upper tubular wall 11 of the tubular portion 11 is used.
Although the hollow box 2 is made using only a, the hollow box 2 can be made using the side wall 11b of the tubular portion 11 in addition to the upper tubular wall 11a.

[0020]

As described above, the ventilator with a muffler according to the present invention is provided with a muffler having a muffling function, which is different from the case where a sound absorbing material is used, to provide stable sound absorbing performance for a long time. It is possible to maintain, and it is easy to form the hollow box and the communication hole that constitute the silencer, and it exhibits an excellent effect.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a ventilator with a muffler of the present invention.

FIG. 2 is a view taken along the line AA of FIG.

FIG. 3 is a vertical sectional view showing how the silencer is assembled to the frame body.

FIG. 4 is a perspective view of a ventilator with a muffler according to another embodiment.

FIG. 5 is a vertical cross-sectional view in which the silencer ventilation device of FIG. 4 is attached to a vehicle body panel.

FIG. 6 is a perspective view of a muffler-equipped ventilation device that is different from FIG. 4.

FIG. 7 is an explanatory diagram of a noise measuring device.

FIG. 8 is a graph of noise measurement values.

FIG. 9 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

1 frame body 11 tube 110 ventilation 12 Flange 13 communication holes 2 hollow box 2a Hollow box forming part 3 sheet-shaped valve O Inside hollow box (space) P Ventilator with silencer S silencer

Claims (3)

[Claims] 1. A frame main body in which a flange portion is provided on an outer periphery of a tubular portion formed with a ventilation port for discharging air inside the vehicle to the outside of the vehicle, and the ventilation port is covered to ventilate according to an increase in vehicle interior pressure. A sheet-shaped valve body attached to the frame main body with its mouth open, and a muffler provided with a communication part that connects the hollow body to the tubular part and connects the inside of the tubular part with the hollow body. A ventilator with a muffler characterized by being provided. 2. A frame main body having a flange portion extending on the outer periphery of a tubular portion formed with a ventilation opening for exhausting vehicle interior air to the outside of the vehicle, and a ventilation opening provided with a lid to ventilate according to a rise in vehicle interior pressure. A sheet-like valve body attached to the frame body with its mouth open, a hollow box forming part that is integrated with the tubular part by causing the tubular part to carry at least one wall surface of the hollow box, and the tube. And a silencer having a communication hole penetrating into the hollow box at a portion thereof. 3. The hollow box forming portion, wherein the silencer is integrated with the tubular portion and the flange portion so that the tubular portion and the flange portion form a wall surface of the hollow box, and the hollow box in the tubular portion. The ventilation device with a muffler according to claim 2, further comprising a communication hole penetrating inward.