JPH09156352A - Mounted structure of butterfly valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily mount a butterfly valve at high sealability and reduce the cost thereof. SOLUTION: A butterfly valve 2 has a projection 20 at one end and an inlet at a position a predetermined distance away from the root of the projection 20, and is designed so that while a cylindrical loop part 22 is formed at one end by passing the projection 20 through the inlet, the projection 20 projecting out of the inlet is locked into a mounting hole 15 in a duct 1. Since the loop part 22 is pressed into contact with the periphery of the mounting hole 15 and a flange base part 10, the mounting hole 15 is sealed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a ventilation system of an automobile, etc., and enables the ventilation by opening an opening by swinging a butterfly valve having elasticity such as rubber.
The present invention relates to a butterfly valve mounting structure that closes an opening to prevent foreign matter from entering from the outside. According to the present invention, the number of parts and the number of parts can be reduced, and the butterfly valve can be easily attached to the duct with high sealing performance.

[0002]

2. Description of the Related Art In automobiles, a ventilation device is provided for promptly discharging the air outside the passenger compartment when the air inside the passenger compartment is contaminated by cigarette smoke or the like. As this ventilation device, for example, as shown in FIG. 6 and FIG.
It is known that a duct 200 made of resin having an opening and a butterfly valve 100 made of rubber mounted so as to be swingable from one side so as to cover the opening 201 of the duct 200 are known.

In this ventilation device, when the atmospheric pressure in the vehicle compartment becomes slightly higher than the outside air pressure, the butterfly valve 100 swings to open the opening 201, so that the air in the vehicle compartment can be easily discharged to the outside. On the other hand, even if dust or water comes into contact with the ventilation device when the wind is strong or when the vehicle is washed, the butterfly valve 100 is pressed by the duct 200 due to the wind pressure or the water pressure to open the opening 2.
Since 01 is closed, foreign matter is prevented from entering the vehicle interior.

In order to swingably attach one end of the butterfly valve to the duct in this way, for example, as shown in FIG. 6, a projection 202 projecting from the duct 200 is passed through a mounting hole 101 of the butterfly valve 100, and the mounting hole 101 is attached. There is known a method in which the projection 202 protruding from is deformed into a shape larger than the mounting hole shape by caulking by heat or the like, and the butterfly valve 100 is sandwiched between the projection 202 and the duct 200 main body and mounted.

Further, for example, as shown in FIG.
There is also known a sandwiching method in which 3 is fixed to an engagement protrusion 205 protruding from the outer 204, and the butterfly valve 100 is sandwiched between the inner 203 and the outer 204.

[0006]

However, in the caulking method, there is a problem that the man-hours for penetrating each protrusion into the mounting hole of the butterfly valve and then deforming each protrusion become large,
The sandwiching method requires two parts, an inner part and an outer part, and has a problem that the number of parts is large. Therefore, either method causes cost increase, and development of a butterfly valve mounting structure that can be mounted at low cost is required.

Therefore, it is conceivable to engage and fix the protrusion provided on the butterfly valve with the mounting hole provided on the duct, for example. However, in this case, by providing the mounting hole in the duct, the sealing performance is deteriorated, and water or dust may pass through the mounting hole and enter the vehicle interior. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a butterfly valve mounting structure that has a high sealing property, can be easily mounted, and is low in cost.

[0008]

The butterfly valve mounting structure of the present invention which solves the above-mentioned problems is characterized by a duct having an opening and an elastic member swingably mounted on the duct so as to cover the opening from one side. In a butterfly valve mounting structure comprising a butterfly valve having a duct, the duct has a mounting hole in the vicinity of the opening, and the butterfly valve has a protrusion engaging with the mounting hole at one end and is located at a position separated from the root of the protrusion by a predetermined distance. With the insertion hole, the projection protruding through the insertion hole engages with the mounting hole when the projection is inserted into the insertion hole and the tubular loop portion is formed at one end of the butterfly valve. Is to seal.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION As a material for a butterfly valve, a soft elastic body such as rubber or thermoplastic elastomer is used. That is, in the mounting structure of the present invention, the elastic loop portion makes elastic contact with the periphery of the mounting hole or the peripheral wall of the duct, so that the mounting hole is sealed by the loop portion.

To construct the mounting structure of the present invention,
First, the protrusion of the butterfly valve is inserted into the insertion hole of the butterfly valve, and a loop portion is formed at one end. Since the butterfly valve has elasticity, the loop portion can be easily formed. Next, a butterfly valve having a loop portion is made to face the opening of the duct, and a projection protruding from the insertion hole is engaged with the attachment hole of the duct. For example, if the protrusion is composed of a neck and a head, and the width of the head is made larger than the length of the mounting hole, the head engages with the periphery of the mounting hole when it comes out of the mounting hole and does not come out of the mounting hole. To be prevented. Thereby, the butterfly valve is swingably attached so as to cover the opening of the duct.

As described above, according to the present invention, the butterfly valve can be easily attached to the duct simply by engaging the protrusion protruding from the insertion hole with the attachment hole of the duct. No need for inners,
It can be installed with a small number of steps without increasing the number of parts. When the pressure on the side opposite to the butterfly valve across the opening becomes high, the butterfly valve swings to open the opening, and when the pressure on the butterfly valve side becomes high, the butterfly valve is pressed against the peripheral edge of the opening to close the opening. At this time, since the loop portion directly or indirectly seals the attachment hole, the problem that foreign matter passes through the attachment hole is prevented.

The size of the loop portion and the number and shape of the projections can be freely set according to the shapes of the duct and the mounting hole.

[0013]

The present invention will be described below in detail with reference to examples. FIG. 1 shows a butterfly valve mounting structure according to an embodiment of the present invention. This mounting structure is a ventilation device provided as a quarter bend of an automobile, and includes a duct 1 made of resin and four plate-shaped butterfly valves 2 made of rubber.

As shown in FIG. 2, the duct 1 is composed of a flange base portion 10 connected to the vehicle body and a vertical cylindrical portion 11 formed integrally with the flange base portion 10. The vertical cylinder portion 11 constitutes an inside air inflow passage 12, and four openings 13 serving as inside air discharge ports are formed on the outlet side of the inside air inflow passage 12. The end surface of the opening 13 is an inclined surface 14 that is inclined by 30 degrees with respect to the axial direction of the vertical tubular portion 11. Further, a mounting hole 15 penetrating the front and back is formed at the upper edge of each opening 13. Three mounting holes 15 are provided in each opening 13.

The butterfly valve 2 has a larger area than the opening 13 and is formed in a plate shape having a thickness of 0.5 mm. In the as-manufactured state, three protrusions 20 are formed at one end as shown in FIG.
Three insertion holes 21 are formed at positions separated from the root of 0, respectively. The protrusion 20 is formed in an arrow shape including a neck portion 20a having a small width and a head portion 20b having a large width. The width of the neck portion 20a is substantially equal to the length of the insertion hole 21, and the width of the head portion 20b is the insertion hole 21. Is greater than the length of. Further, the insertion hole 21 and the attachment hole 15 of the duct 1 are formed to have the same size.

This butterfly valve 2 has one end bent in the direction of the arrow shown by the alternate long and short dash line in FIG.
1 and a loop portion 2 at one end as shown in FIG.
2 are formed. Since the head portion 20b engages with the peripheral portion of the insertion hole 21 on the side opposite to the insertion hole 21, the loop portion 22 maintains its shape. Butterfly valve 2 with loop 22
Is disposed on the side of the inclined surface 14 of the opening 13 of the duct 1, and the projection 20 protruding from the insertion hole 21 is inserted into the mounting hole 15. At this time, the head portion 20b is inserted while being deformed, and the head portion 20b is inserted from the mounting hole 15 toward the vertical cylindrical portion 11 side and restored to the original shape, thereby engaging with the peripheral edge portion of the mounting hole 15, whereby the butterfly valve 2 is ducted. It is attached to 1 so that it can swing. The loop portion 22 elastically contacts the peripheral edge portion of the mounting hole 15 and also the inner peripheral surface of the flange base portion 10, and a compressive stress acts on the loop portion 22 in the radial direction. As a result, an elastic reaction force is generated in the loop portion 22 to make a strong elastic contact with the peripheral edge portion of the mounting hole 15, so that the mounting hole 15 is sealed and the butterfly valve 2 is swingably mounted to the duct 1.

In this case, it is preferable to form the mounting hole 15 near the flange base 10 as shown in FIG. Since the loop portion 22 has a constant tubular shape whose inner diameter is the distance from the base of the protrusion 20 to the insertion hole 21, the loop portion 22 is pressed by the flange base portion 10 and the butterfly valve 2 of the butterfly valve 2 is configured as described above. As the plate-shaped portion 23 is further wound, the loop portion 22 and the overlapping portion 24 of the plate-shaped portion 23 are formed. Further, in the loop portion 22, the compression stress in the radial direction is further increased due to the presence of the overlapping portion 24, and in the overlapping portion 24, the elasticity of the loop portion 22 causes the loop portion 22 and the plate portion 23 to be strongly pressed against each other. Therefore, the insertion hole 21 is sufficiently sealed and the outside air or water is prevented from entering the mounting hole 15 through the insertion hole 21, so that higher sealing performance can be secured.

In this ventilator, the butterfly valve 2 in the normal state has the inclined surface 14 due to its own weight and elasticity of the loop portion 22.
, And the opening 13 is closed. When the pressure in the passenger compartment is slightly higher than the outside air, the pressure is increased to the inside air inflow passage 12
Is transmitted to the butterfly valve 2 via the, and the butterfly valve 2 swings in a direction away from the inclined surface 14 to open the opening 13. As a result, the inside of the vehicle is communicated with the outside, and the inside air is smoothly discharged from the inside air inflow passage 12 through the opening 13 to the outside.

On the other hand, when water pressure or wind pressure acts on the butterfly valve 2 from the outside during a car wash or a strong wind, the butterfly valve 2 is pressed against the inclined surface 14 by the pressure and closes the opening 13. This prevents water and outside air from entering the vehicle interior. Since the loop portion 22 is elastically contacted with the peripheral edge of the mounting hole 15, the mounting hole 15 is sealed and the mounting hole 15
Water and outside air are prevented from entering through.

That is, in the butterfly valve mounting structure of the present embodiment, the butterfly valve 2 can be mounted on the duct 1 simply by inserting the projection 20 into both the insertion hole 21 and the mounting hole 15, and the man-hours are small and easy. It can be installed with high sealing performance.

[0021]

According to the butterfly valve mounting structure of the present invention, the butterfly valve can be mounted on the duct with a small number of parts, a small number of steps, and a high sealing property. Therefore, cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a butterfly valve mounting structure according to an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of a duct used in a butterfly valve mounting structure according to an embodiment of the present invention.

FIG. 3 is a perspective view of a butterfly valve used in a butterfly valve mounting structure according to an embodiment of the present invention immediately after being manufactured.

FIG. 4 is a perspective view of a butterfly valve used in a butterfly valve mounting structure according to an embodiment of the present invention immediately before mounting.

FIG. 5 is an enlarged cross-sectional view of a main part showing a more desirable mode of the butterfly valve mounting structure according to the embodiment of the present invention.

FIG. 6 is a sectional view showing a conventional butterfly valve mounting structure.

FIG. 7 is a cross-sectional view showing a conventional butterfly valve mounting structure.

[Explanation of symbols]

1: Duct 2: Butterfly valve 1
3: Opening 15: Mounting hole 20: Protrusion 2
1: Insert hole 22: Loop part

Claims (1)

[Claims] 1. A butterfly valve mounting structure comprising a duct having an opening and an elastic butterfly valve swingably mounted to the duct so as to cover the opening from one side, wherein the duct is the opening. Has a mounting hole in the vicinity of, and the butterfly valve has a protrusion at one end that engages with the mounting hole, and has an insertion hole at a position separated from the root of the protrusion by a predetermined distance. The protrusion protruding from the insertion hole engages with the attachment hole in a state where a tubular loop portion is formed at one end of the butterfly valve by being inserted, and the loop portion seals the attachment hole. A butterfly valve mounting structure featuring.