초록 ▼

An air passage opening/closing system includes a case having a casing opening portion, and a film door having a plurality of door opening portions. The case has a thin portion extending from a peripheral portion of the casing opening portion in a moving direction of the film door. In the system, a d

An air passage opening/closing system includes a case having a casing opening portion, and a film door having a plurality of door opening portions. The case has a thin portion extending from a peripheral portion of the casing opening portion in a moving direction of the film door. In the system, a distance between the peripheral portion of the casing opening portion and the film door is not smaller than 5 mm, the case has a thick portion connected to the thin portion, and the thick portion contacts the film door to have a predetermined friction therebetween during moving the film door. Therefore, air flowing from a door opening portion collides with an inner surface of the thin portion of the case so that a flow rate of air is reduced, and then expands in a space between the thin portion of the case and the film door so that the flow rate of air is further reduced. Thus, it can prevent a whistle noise from being caused when the casing opening portion starts opening, while keeping an excellent airtightness of the system when the casing opening portion is fully closed.

대표청구항 ▼

[ What is claimed is:] [1.] An air passage opening/closing system comprising:a case for forming an air passage, said case having a casing opening portion through which air flows outside; anda film member, disposed under tension to be opposite to said casing opening portion at an upstream air side of

[ What is claimed is:] [1.] An air passage opening/closing system comprising:a case for forming an air passage, said case having a casing opening portion through which air flows outside; anda film member, disposed under tension to be opposite to said casing opening portion at an upstream air side of said casing opening portion, for opening and closing said casing opening portion, said film member having a film opening portion which is tapered at both ends thereof in a longitudinal direction of said film member, wherein:said film member is controlled to move in the longitudinal direction of said film member to open and close said casing opening portion of said case;said case has a first wall member extending from a peripheral end of said casing opening portion by a predetermined length in the longitudinal direction of said film member, said first wall member has an inner surface to which air flowing from said film opening portion crosses;said first wall member is disposed to form a predetermined distance between said peripheral end of said casing opening portion on said inner surface of said first wall member and said film member, said predetermined distance in a vertical direction perpendicular to the longitudinal direction of said film member being 5 mm or more;said case has a contacting inner surface approximately contacting said film member; andsaid inner surface of said first wall member is recessed from said contacting inner surface in said vertical direction.