JPH0236024Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a butterfly-type damper device used to open and close an opening of an air duct in an air conditioner for an automobile or the like.

(Prior art) This type of damper device has a rotating shaft provided in the middle of the door body, and this rotating shaft is rotatably inserted into an insertion hole formed in the air duct body. The door body rotates around the axis of movement. Then, the peripheries of the door portions on both sides of the rotation shaft come into close contact with the periphery of the opening formed in the air duct to close the opening. It is well known to fix a seal member to the door portion in order to ensure sealing performance when the door is closed, as shown in, for example, Japanese Utility Model Application Publication No. 54-27558.

(Problem to be solved by the invention) However, in the past, an axial gap was provided between the end of the door body and the air duct, and this gap ensured smooth rotation of the door body with respect to the air duct. was. Therefore, when it is closed, the above-mentioned sealing member comes into close contact with the air duct to ensure sealing performance except for the area around the rotation axis, but a gap remains in the area around the rotation axis. There was a problem that air leaked from this gap.

Therefore, the object of this invention is to provide a damper device that can ensure smooth rotation of the door body and provide a more complete seal when the door is closed.

(Means for solving the problem) However, the gist of this invention is that a rotating shaft is provided in the middle of the door body, and both sides of this rotating shaft are door parts. The shaft is rotatably inserted into the insertion hole formed in the air duct, and the sealing member fixed to the door part of the door body tightly fits around the opening formed in the air duct to provide a seal when closed. In the butterfly type damper device, a protruding portion protruding from the door portion is formed near the rotation axis of the sealing member, and the tip of the protruding portion is attached to the elastic portion of the sheet member around the insertion hole of the air duct. The reason is that they are made to fit closely together.

(Function) Therefore, since the tip of the protrusion formed on the sealing member of the door body comes into close contact with the air duct around the insertion shaft, when the door is closed, this protrusion allows the The axial gap between the air duct and the door body is sealed, so that the above object can be achieved.

(Embodiment) An embodiment of this invention is shown in FIGS. 1 to 3, in which a door body 1 is made of, for example, synthetic resin, and a rotation shaft 2 is integrally formed in the middle of the door body 1. ing. Door portions 3a and 3b are formed on both upper and lower sides of the rotating shaft 2, and the door portions 3a and 3b are formed parallel to each other and offset in the diametrical direction of the rotating shaft 2. The rotation shaft 2 protrudes from both left and right sides of the door body 1, and extends through an insertion hole 5 for an air duct 4 as described below.
a, 5b, and the door body 1 is inserted into the air duct 4.
It is supported so that it can rotate freely.

The air duct 4 is, for example, an air conditioner for an automobile. U-shaped flanges 6a and 6b are formed on the inner wall of the air duct 4, and an opening 7a is formed inside the flanges 6a and 6b. , 7b are formed. The insertion holes 5a, 5b are formed on both sides of the portion where the flange portions 6a, 6b face each other,
The peripheral edge portions of the insertion holes 5a, 5b protrude inward to form thrust receiving portions 8a, 8b, and the end surfaces of the thrust receiving portions 8a, 8b and the door portion 3
A predetermined thrust gap is provided between the side ends of the doors a and 3b to ensure smooth rotation of the door body 1.

The seal members 9a and 9b are made of rubber having a large number of pores, for example, and are formed in a U-shape so as to correspond to the flange portions 6a and 6b of the air duct 4, excluding the portion of the rotation shaft 2. , door parts 3a, 3b
The sealing members 9a, 9b are tightly attached to the flange portions 6a, 6b to close the openings 7a, 7b.

The overhanging parts 10a and 10b are the seal members 9a and 9b.
It is formed so as to protrude from the door parts 3a, 3b on both left and right sides near the rotation axis. This overhang 10
The protrusion width of a and 10b is formed to be slightly larger than the above-mentioned thrust gap, so that the protruding parts 10a and 10b are elastically deformed and their tips abut against the thrust receiving parts 8a and 8b of the air duct 4. There is.

Therefore, when the door body 1 is closed,
The sealing members 9a and 9b of the door body 1 are in close contact with the flanges 6a and 6b of the air duct 4, sealing in the thickness direction of the door body 1 except around the rotation axis, and sealing around the rotation axis. Since the projecting parts 10a and 10b of the members 9a and 9b closely contact the thrust receiving parts 8a and 8b of the air duct 4 and seal them in the thrust direction, it is possible to almost eliminate the gap between the door body 1 and the air duct 4. can. In order to open the door body 1, the rotation shaft 2 may be rotated counterclockwise in FIG. 2 manually or mechanically by an actuator. move away from In this case, the overhang 10
Although the parts a and 10b remain in close contact with the thrust receiving parts 8a and 8b, the thrust clearance between the door parts 3a and 3b and the thrust receiving parts 8a and 8b is secured, so that the door body 1 can rotate smoothly. be exposed.

In addition, in the above embodiment, the overhanging portions 10a, 1
0b is provided on both the left and right sides, but when the door body 1 is biased to one side, that is, when the thrust gap on one side is set to zero, the overhang portion can be formed on only one side.

(Effects of the invention) As described above, according to this invention, a protrusion is formed near the rotation axis of the sealing member, and the protrusion is used to seal the vicinity of the rotation axis. Therefore, air leakage from around the rotating shaft can be prevented. Further, since the projecting portion is made to have elasticity and come into close contact with the air duct, it is possible to reduce the increase in friction and ensure smooth rotation of the door body. Furthermore, since the projecting portion is formed integrally with the sealing member, it is possible to reduce the cost without increasing the number of parts.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a door body used in an embodiment of the invention, FIG. 2 is a sectional view showing the entire embodiment of the same, and FIG. 3 is a right side view of the same. 1...Door body, 2...Rotation shaft, 3a, 3b...
... Door part, 4 ... Air duct, 5a, 5b ... Insertion hole, 9a, 9b ... Seal member, 10a, 10
b...Protruding part.

Claims (1)

[Scope of utility model registration request] A rotating shaft is provided in the middle of the door body, and both sides of this rotating shaft serve as door parts, and the rotating shaft is rotatably inserted into an insertion hole formed in the air duct, and the door body In a butterfly type damper device, a sealing member fixed to a door portion of the air duct is in close contact with the periphery of an opening formed in the air duct to provide a seal when the air duct is closed. A damper device comprising: a projecting portion projecting from a door portion; and a tip of the projecting portion being brought into close contact around an insertion hole of the air duct with the elasticity of the sheet member.