JPH07179118A - Ventilation duct and flap thereof - Google Patents

Abstract

PURPOSE:To provide a flap for ventilation duct, which can secure the sufficient quantity of ventilation even in the case where pressure difference between the inside and the outside of a cabin is small and which can be opened/closed without generating the bending fatigue and which can be easily manufactured and fitted. CONSTITUTION:A flap 1 of a cabin ventilating duct A is fitted to an opening frame 22 provided in a duct main body 2 so as to be automatically opened/ closed. In this flap 1, a rectangular cover material 11, plural suspending leg parts projected in the upper edge of the cover material 11 with a space, and an umbrella-like insert 13 having a wide part in the lower end thereof and arranged in the tip of the suspending leg part are formed integrally. A long hole 221, of which lateral width is formed smaller than a wide part of an insert 13, is provided in the opening frame 22, and the insert material 13 is passed through the long hole 211 so that it can not be drawn out, and the suspending leg part is loosely inserted into the long hole 221 to form the cover material 11 freely to be oscillated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation duct and a flap for the ventilation duct, which ensures ventilation of a vehicle while the vehicle is running and prevents foreign matter and exhaust gas from entering the vehicle when the vehicle is stopped. . Used for quarter vents, etc.

[0002]

2. Description of the Related Art At the rear of an automobile, there is a ventilation duct for replacing air in the vehicle interior during traveling. Air that has entered from the front of the passenger compartment or the like is exhausted intensively to the outside of the vehicle through the opening of the ventilation duct. By the way, a flap is attached to the opening frame forming the opening, and during traveling, the flap changes its opening degree according to the pressure difference between the inside and outside of the vehicle to adjust the air volume. When the vehicle is stopped, the flap covers the opening to prevent foreign matter from entering the vehicle interior from the outside. Further, when the pressure inside the vehicle is lower than the external pressure, such as when the window is opened during traveling, the flap is in close contact with the opening to prevent intake of exhaust gas.

Such a flap is usually made of an elastic rubber sheet, and the attachment structure to the opening frame has conventionally been as follows. That is, as shown in FIG. 14, the flap 4
15 is inserted into the hole 24 provided in the opening frame 22 to be fitted and killed (prior art 1), or as shown in FIG. 15, the flap 5 is fixed to the opening frame 22 by a thermal caulking method (prior art). 2) It did. And flaps 4, 5
Attaches to the opening frame 22 with the opening 21 covered.
When the vehicle interior pressure increases, the flaps 4 and 5 are elastically deformed (shown by the two-dot chain line) to open the valve.

[0004]

However, the conventional flap has some problems in terms of function and quality. The flaps 4 and 5 have holes 24 and screws 6 at one end.
It is fixed in (Fig. 14, Fig. 15),
When a pressure difference is generated outside, it is bent around the fulcrum to allow ventilation, but when the flaps 4 and 5 are bent, an elastic restoring force acts to suppress the air flow. In order to secure the ventilation volume, it is desirable to open the valve under the condition that the pressure difference inside and outside the vehicle is as small as possible. However, conventional flaps 4, 5
Is the force in the direction in which the elastic restoring force closes the flaps 4 and 5, and the required ventilation volume could not be obtained unless the pressure difference was large to some extent. In addition, if the hinge portion 42 and the bent portion 51 that bend are repeatedly bent, there is a fear that the portion may be broken due to bending fatigue.

The present invention solves the above-mentioned problems, and it is possible to secure a necessary ventilation amount even if the pressure difference between the inside and outside of the vehicle is small.
It is another object of the present invention to provide a ventilation duct that can be opened and closed without bending fatigue, can be easily manufactured, and can be easily assembled, and a flap thereof.

[0006]

The ventilation duct according to the first aspect of the present invention is a ventilation duct attached to a vehicle, and an opening frame having an opening for discharging air inside the vehicle to the outside of the vehicle. It is provided outside the car of the opening frame so that the lid covers the opening,
There is a plate-like flap that opens only in the direction toward the outside of the vehicle due to the pressure difference between the inside and outside of the vehicle, and an umbrella-shaped insert is provided at the upper edge of the lid related to this flap via the hanging foot of the constricted portion. On the other hand, it is characterized in that the opening frame is provided with a long hole that engages with the insert body, and the insert body is penetrated through the long hole so that the lid body cannot be pulled out and the lid body is swingable. The flap of the ventilation duct according to the second aspect of the present invention is a flap of the ventilation duct that is attached to an opening frame provided in the duct body so as to be automatically opened and closed, and has a rectangular lid body and an interval between the upper edge of the lid body. Punching or press-molding a plurality of suspension foot portions that are opened with a hole and an umbrella-shaped insert body that has a wide portion on the lower side and is arranged at the tip of the suspension foot portion so as to be bound by this suspension foot portion. , Integrally formed by injection molding or the like, and the opening frame is provided with a long hole having a width smaller than that of the wide portion of the insert, and the insert is pierced through the long hole so that the insert cannot be removed. It is characterized in that the legs are freely inserted into the elongated holes so that the lid can swing. Here, the "umbrella-shaped insert" means that the joint with the suspension foot is wider than the suspension foot and is tapered toward the upper end. Includes goose neck, arrowhead, and arrow shapes.

[0007]

According to the ventilation duct and the flap thereof according to the present invention, the insertion member is locked in the opening frame at its wide portion only by penetrating the insertion member into the elongated hole of the opening frame, so that the flap is opened. Cannot be removed from the frame. Since the suspension foot portion is formed to have a small width so that the suspension foot portion can be constricted, the suspension foot portion is loosely inserted in the elongated hole. Therefore, when the flap is opened, the lower edge of the insert body comes into contact with the opening frame around the elongated hole and the entire flap is tilted, so that even if the flap is opened, no elastic restoring force is generated. In this way, even if the pressure difference between the inside and outside of the vehicle is small, the flap is opened widely, and a desired ventilation amount is secured. Further, since the flap has a plate-like structure, it can be easily manufactured by punching, injection molding, press molding or the like.

[0008]

EXAMPLES The present invention will be described in detail below based on examples. (1) Embodiment 1 Configuration of Flap FIGS. 1 to 7 show an embodiment of a flap of a ventilation duct according to the present invention. 1 is a plan view of the flap, FIG. 2 is a perspective view showing a state in which the flap is attached to the opening frame of the duct body, and FIG. 3 is an enlarged perspective view in which the flap is attached to the opening frame.
4 to 6 are sectional views of FIG. 3, and FIG. 7 is an overall view of a ventilation duct to which a flap is attached.

Reference numeral 1 is a flap of a ventilation duct, which is composed of a lid body 11, a suspension foot portion 12, and an insert body 13. The material of flap 1 is ethylene propylene diene copolymer rubber (E
PDM) having a hardness of 50 degrees (JIS A hardness) is used. The flap 1 is obtained by punching a sheet plate having a thickness of 0.5 mm into a predetermined shape by press molding.

The lid 11 has a rectangular shape and is large enough to cover the opening 21 provided in the duct body 2 of the ventilation duct A. A plurality of suspension legs 12 are integrally formed on the upper edge of the lid 11 at regular intervals so as to project.
The suspension foot portion 12 is a tongue-shaped member and is punched to have a width (about 7 mm) smaller than the length of the lower side of the next insert body 13. Therefore, the suspension foot portion 12 has the long hole 2 provided in the opening frame 22 of the duct body 2.
When it is inserted into 21 (about 8 mm x 1.0 to 1.5 mm), it is in a loosely inserted state.

The insert 13 has an umbrella shape by forming a substantially isosceles triangle with a sharp tip (FIG. 3). The insert 13 has a wide portion 131 on the lower side so that the suspension foot 12 can be bound,
It is arranged at the tip of the suspension foot portion 12. The wide portion 131 (about 10 mm) of the insert 13 is slightly longer than the long hole 221.
However, since the tip of the insert 13 has a sharp wedge shape, it can be pushed into the elongated hole 221 with a slight force (FIG. 2). Then, once the insertion body 13 penetrates the elongated hole 221, the wide portion 131 exerts a returning function, and the insertion body 13 cannot be removed from the elongated hole 221. Thus flap 1
Has a configuration in which the lid 11 is hung while the insert 13 is placed on the opening frame 22 around the elongated hole 221 (FIG. 3).

In a normal state, the lid body 11 hangs down by its own weight and covers the opening 21. Then, when the vehicle interior pressure becomes higher than the external pressure, the flap 1 with the lower edge of the insert 13 as a fulcrum.
The whole is tilted and separated from the opening frame 22, and ventilation is performed in the vehicle interior (FIG. 4). By the way, the long hole 221 of the duct body 2
Around the periphery, an inclined surface 23 is formed that is wider than the insert 13 and is notched. This is because the insert 13 does not contact the duct body 2 and the flap 1 can be smoothly tilted.

On the other hand, when the vehicle interior pressure becomes lower than the external pressure,
The lid 11 in the hanging state is attracted to and closely adheres to the opening 21. Here, it is preferable to use ethylene propylene diene copolymer rubber as a material of the flap 1 in which ferrite is mixed, and to use plastic magnets in the opening frame 22 in which a magnetic material is dispersed in resin. Flap 1
This is because the function of maintaining close contact with the opening frame 22 of the flap 1 can be improved during the close contact of the flap 1. As the "magnetic material", ferrite, sendust, pure iron, silicon steel or the like is appropriately selected. However, if the magnetic force is too strong, it will cause resistance when opening the valve, so adjust and mix.

Ventilation resistance test Reference numeral A is a ventilation duct obtained by attaching the flap 1 manufactured as described above to the opening 21 of the duct body 2 (FIG. 7). A ventilation resistance test was conducted on this ventilation duct, which will be described below. This test investigates the relationship between the ventilation amount and the ventilation resistance of the flap 1 (pressure inside the vehicle-external pressure). The measurement was performed using a measuring device 3 as shown in FIG. The device 3 has an opening 32 on the opposite side surface of the device body 31,
33, the fan 34 is attached to one side, and the ventilation duct A to be tested is attached to the other side.

The cylindrical tube 3 covers the fan 34.
5 is fixed to the main body 31 of the apparatus, and a nozzle 351 is provided in the cylindrical tube 35. By connecting the nozzle 351 and the manometer 36 with the tube 37, the static pressure P ₂ in the cylindrical tube 35 can be measured. Further, a nozzle 311 is also provided on the upper part of the device body 31, and a static pressure P in the device body 31 is measured by a manometer 39 connected through a tube 38.
_I can measure one.

The following measurement of ventilation resistance was performed using the above apparatus. First, the ventilation duct A of this example was attached to the opening 33. Next, the fan 34 is activated, and air is blown from the outside (one opening of the tubular pipe 35) to the device main body 31.
The air was blown into the room and ventilated so as to be discharged from the ventilation duct A. The static pressures of the manometers 36 and 39 were measured, and the ventilation volume was obtained from the conversion table (Bellmouth pressure VS air volume). On the other hand, the ventilation resistance (P ₁ −P ₀ ) was obtained by subtracting the external pressure P ₀ from the measured value of the static pressure P ₁ of the manometer 37. The ventilation amount of the fan 34 was adjusted, the five cases were actually measured, and a curve (G line) of the ventilation resistance value with respect to the ventilation amount of the ventilation duct A as shown in FIG. 9 was obtained. Further, the same test as described above was conducted using the ventilation duct replaced with the flap 5 (conventional technique 2) attached by the thermal caulking method, and a curve (B line) of the ventilation resistance value with respect to the ventilation amount was obtained.

(2) Example 2 This example shows a flap 1 made by injection molding as shown in FIG. Except for the shape around the insert body 13, the shape is the same as that of the first embodiment. The flap 1 of FIG. 10 is a portion corresponding to the sectional view taken along the line LL of FIG. Since the overhanging portion 132 located at the lower edge of the insert 13 seals the gap between the elongated hole 221 and the flap 1, the escape of air from this gap is prevented. Therefore, there is no problem that exhaust gas is sucked into the vehicle when the vehicle internal pressure becomes lower than the external pressure. The thickness of the overhang 132 is preferably 0.2 to 0.3 mm larger than the opening width of the elongated hole 221. In this embodiment, the lid 11 is hung while the wide portion 131 of the insert 13 and the overhanging portion 132 are placed on the opening frame 22 around the elongated hole 221. Then, when the vehicle interior pressure becomes higher than the outside air pressure, the entire flap 1 tilts around the lower edge of the insert 13 as a fulcrum and moves away from the opening 21 (two-dot chain line).

FIG. 11 shows another type of flap 1 made by injection molding. The flap 1 of FIG. 11 is also the LL of FIG.
This is a portion corresponding to a sectional view taken along the arrow. Although the periphery of the insert 13 is shown, the shapes of the other parts are the same as those in the first embodiment.
The same action and effect as the flap 1 of FIG. 10 are obtained.

(3) Embodiment 3 FIGS. 12 and 13 show an embodiment of a ventilation duct according to the present invention. The flap 1 is the same as that of the first embodiment. The overall shape of the ventilation duct A is as shown in FIG. 12 is a vertical sectional view of the ventilation duct, and FIG. 13 is FIG.
2 is a partially enlarged view of FIG. The duct body 2 of the ventilation duct A shown in FIG. 12 corresponds to the cross-sectional view taken along the line U-U of FIG. 7. The upper opening edge 25 forming the elongated hole 221 has an edge shape in which the cross section is cut out upward. Then, when the flap 1 covers the opening 21, the edge tip of the upper opening edge 25 abuts the surface of the flap 1 (FIG. 1).
3). With such a configuration, when the vehicle exterior pressure becomes higher than the vehicle interior pressure, the outside air flow presses the lid 11 (see FIG. 12).
Solid line arrow), the opening portion 21 is sealed, and the suspension foot portion 1
2 also comes into contact with the upper opening edge 25, so that the outside air becomes
Prevent entry from 1 into the passenger compartment. On the other hand, when the vehicle interior pressure becomes higher than the vehicle exterior pressure, a gap is formed in the long hole 221, but the wind that expels the vehicle interior air from the vehicle interior to the vehicle exterior (see FIG.
There is no problem because it is the two-dot chain line arrow 2). Further, with the above configuration, when the insertion body 13 of the flap 1 is inserted into the elongated hole 221 (two-dot chain line in FIG. 13), the opening width W of the elongated hole 221 becomes wider than the flap thickness t, so that the flap 1 Can be easily engaged with the duct body 2. The other components are the same as those in the first embodiment. Reference numeral 26 indicates a drain, and reference numeral 27 indicates a mounting hole. Note that FIG. 13 corresponds to FIG.

(4) Effect of Example From the measurement results of FIG. 9, the flap 1 of Example 1 had a ventilation resistance that was about 30% lower than that of the conventional product, and an equivalent ventilation amount was secured. It was also found that the initial opening / closing resistance could be halved. Although the setting varies depending on the vehicle type and the like, a ventilation amount of 100 to 120 m ³ / h is generally required. The flap 1 of the present invention can achieve the amount even if the ventilation resistance is small, and in view of the air displacement in the passenger compartment, the antifogging property, etc., the flap 1 is convenient for a vehicle requiring comfort. Further, since the required air flow can be obtained even if the opening area is made small, the parts can be made small and it is economical. When the ventilation resistance (P ₁ -P ₀ ) was negative pressure, the same sealing performance as the conventional product was secured and there was no problem. Further, since the valve opening by the flap 1 tilts with the lower edge of the insertion body 13 as a fulcrum so as to swing without bending, the flap 1 at the time of valve opening has no elastic restoring force.

On the other hand, when the ventilation duct A is assembled,
The ventilation duct A could be easily obtained only by inserting the insert body 13 of the flap 1 into the elongated hole 221. When the duct body 2 and the flap 1 are integrated, the long hole 2
Since the 21 and the insert 13 overlap each other by 2 mm, the state in which they cannot be pulled out was maintained. When such a flap 1 was manufactured by punching from a flat plate, the manufacturing cost could be kept low (Example 1). Furthermore, in the flap 1 of the second embodiment formed of an injection molded product, in addition to the effect of the first embodiment, the long hole 22
By filling the gap between the flap 1 and the flap 1 with the overhanging portion 132, it was possible to regulate the wind passing through this gap. Therefore, the air could be exhausted to the outside of the vehicle intensively only through the opening 21 of the ventilation duct. Further, the configuration of the ventilation duct A as in the third embodiment facilitates the insertion of the insert body 13 of the flap 1 into the elongated hole 221.
Assembly of ventilation duct A has become easier. The assembled ventilation duct not only reliably opens the flap 1 against a small pressure difference inside and outside the vehicle, but also when the flap 1 is closed, the lid 11 covers the opening 21. In addition, since the upper opening edge 25 abuts the suspension foot portion 12 and seals the elongated hole 221, it is possible to completely shut out the invasion of outside air into the vehicle interior.

The present invention is not limited to those shown in the above embodiments, but can be variously modified within the scope of the present invention depending on the purpose, application and the like. For example, the shape, the material, the thickness, the size, etc. of the lid body 11, the suspension foot portion 12, and the insert body 13 are not limited to the present embodiment, and can be variously changed according to the purpose and the like. Even when the flap 1 is compounded with ferrite, the compounding amount can be selected in accordance with the measure against the dance on the contact surface of the opening frame 22, the vehicle type, and the like. Further, the opening frame 22 constitutes a part of the duct body 2 and does not matter whether it is integrated as a whole.

[0023]

As described above, the ventilation duct and its flap according to the present invention are easy to assemble and can be easily manufactured, and moreover, sufficient ventilation can be secured, so that productivity is improved and cost is reduced. It also contributes to the car and has an excellent effect on ensuring the comfort of the passenger compartment.

[Brief description of drawings]

FIG. 1 is a plan view of a flap according to an embodiment.

FIG. 2 is a perspective view showing a state in which a flap is attached to an opening frame of a duct body.

FIG. 3 is an enlarged perspective view in which a flap is attached to an opening frame.

FIG. 4 is a sectional view taken along line XX of FIG.

5 is a cross-sectional view taken along line YY of FIG.

6 is a sectional view taken along line ZZ in FIG.

FIG. 7 is an overall explanatory view of a ventilation duct to which a flap is attached.

FIG. 8 is a schematic view of a ventilation test measuring device used in this example.

FIG. 9 is a graph showing the relationship between the ventilation amount and the ventilation resistance of the flap.

FIG. 10 is a partially enlarged view of the flap of the second embodiment.

FIG. 11 is a partially enlarged view of the flap of another embodiment in the second embodiment.

FIG. 12 is a vertical sectional view of a ventilation duct according to a third embodiment.

13 is a partially enlarged view of FIG.

FIG. 14 is an explanatory cross-sectional view of Prior Art 1.

FIG. 15 is an explanatory cross-sectional view of Prior Art 2.

[Explanation of symbols]

 1 Flap 11 Lid 12 Suspended Foot 13 Insert 131 Wide Part 2 Duct Body 22 Opening Frame 221 Long Hole A Ventilation Duct

Claims (2)

[Claims] 1. An opening frame (22) in a ventilation duct attached to a vehicle, the opening frame (22) having an opening (21) for exhausting air inside the vehicle, and the opening outside the vehicle. A plate-like flap (1) which is provided with a lid (11) so as to cover the portion, and is opened only in the direction toward the outside of the vehicle due to the pressure difference between the inside and outside of the vehicle
And an umbrella-shaped insert body (13) is formed on the upper edge of the lid body related to the flap via the hanging foot portion (12) of the constricted portion, while the insert body is engaged with the insert frame in the opening frame. Mating slot (22
A ventilation duct in which 1) is provided, and the insertion body is made to penetrate the elongated hole so that the insertion body cannot be removed and the lid body is swingable. 2. A flap of a ventilation duct which is attached to an opening frame provided in a duct main body so as to be automatically opened and closed, wherein a rectangular lid (11) and a plurality of upper lids are spaced apart from each other. A projecting suspension foot portion (12) and an umbrella-shaped insert (13) having a wide portion on the lower side and arranged at the tip of the suspension foot portion so as to be bound by the suspension foot portion are integrally formed. The opening frame is provided with an elongated hole having a width smaller than that of the wide portion of the insert body, the insert body is penetrated through the elongated hole to make it impossible to remove, and the suspension foot portion is loosely inserted into the elongated hole. The flap of the ventilation duct is characterized in that the lid is swingable in the state.