Air passage switching system for air conditioner

Details Air passage switching system for air conditioner Air passage switching system for air conditioner

1998-12-10

2000-04-11

Joyce, Harold

Valves and valve actuation

Rotary valves

Butterfly

251306, 454 69, F16K 122

Patent

active

060479515

ABSTRACT:
An air passage switching system includes a case forming an air passage, and a butterfly door for opening and closing the air passage. The door includes a door body, a rotation shaft for rotating the door body, and a seal member attached to the door body. A link member is connected to a first end of the rotation shaft, and the first end of the rotation shaft is rotatably held in a shaft receiving portion of the case through the link member. A first cylindrical portion is formed in the door body concentrically with the rotation shaft at an outer peripheral side of the first end, and a second cylindrical portion protruding to a side of the door body is formed in the case. The first cylindrical portion and the second cylindrical portion are engaged so that a small gap is formed between an outer peripheral surface of the second cylindrical portion, and an inner peripheral surface of the first cylindrical portion and an end of the seal member. Further, the first and second cylindrical portions are overlapped in a longitudinal direction of the rotation shaft by a predetermined length. Thus, the door is air-tightly connected to the case around the rotation shaft, while it can prevent an operation force of the door from increasing.

REFERENCES:
patent: 4032108 (1977-06-01), Kintner
patent: 4402486 (1983-09-01), Jacquet
patent: 4492361 (1985-01-01), Jacquet et al.

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