JP2000225825A - Air duct switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the sizes of banks on case sides abutted on a lip seal of a rotary door and to increase opening area of an air duct to be opened/closed by the rotary door. SOLUTION: A substantially U-shaped lip seal 10 fixed to both rotating tips of a door substrate 9 constituting a rotary door 8 is arranged by being offset at the outside of a surface (reference to A) passing a door rotary shaft 11. As a result, a seal surface is capable of reducing case side banks on both sides. By providing the banks in parallel to the lip seal 10, shut amount of the lip seal 10 (bending amount of the lip seal 10 at the time of abutting the banks) can be properly kept from the door rotary shaft 11 side to an outer periphery.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air passage switching device using a rotary door.

[0002]

2. Description of the Related Art There is an air passage switching device in which a lip seal made of an elastic body is provided around a plate door to improve the sealing performance (not a known technique).

[0003]

When the above-mentioned lip seal is applied to a rotary door, as shown in FIGS. 2 and 3, when the rotary door is switched, the bank on the case side having the sealing surfaces on both sides is the door. It will be at the center of the rotation range. Similarly to the lip seal of a plate door, when a bank is designed with a lip seal disposed on a surface passing through a door rotation axis in a rotary door, a large V-shaped bank α is obtained as shown by a two-dot chain line in FIG. There is a problem that the opening area of the air passage is closed by the bank α and halved.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to reduce the size of a case-side bank contacting a lip seal of a rotary door and to provide an air passage opened and closed by the rotary door. It is an object of the present invention to provide an air passage switching device capable of increasing the opening area of the opening.

[0005]

Since the lip seal is offset from the surface passing through the door rotating shaft, the size of the bank on the case side having the sealing surfaces on both sides can be reduced. As described above, since the size of the bank provided on the case side can be reduced, the opening area of the air passage opened and closed by the rotary door can be increased.

Further, the lip seal is offset from the surface passing through the door rotation axis, and a bank is provided in parallel with the lip seal, so that the shut amount of the lip seal (the lip seal in a state in which it is in contact with the bank). (Bending amount) can be appropriately maintained from the rotation shaft side to the outer periphery of the door.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 is a side view of the rotary door, FIG. 2 is a cross-sectional view of the blower unit in the inside air mode, FIG. 3 is a cross-sectional view of the blower unit in the outside air mode, FIG. Is an explanatory diagram of a bank.

The air passage switching device shown in this embodiment is
The blower unit applied to the inside / outside air switching means 1 of the blower unit in the automotive air conditioner will be described with reference to FIGS. The blower unit includes a blower device 2 and a filter 3 in addition to the inside / outside air switching means 1. The blower device 2 includes a fan 4, a scroll case 5, and a motor 6.

The inside / outside air switching means 1 includes an inside / outside air switching box 7 (corresponding to a case) provided with an inside air introduction port 7A and an outside air introduction port 7B, a rotary door 8, and a driving means for driving the rotary door 8. (Not shown, for example, a servomotor or the like). Rotary door 8
Is attached to an inelastic door substrate 9 by an elastic lip seal 10.
Are provided integrally. The door substrate 9 has an outer peripheral wall surface extending in the door rotating direction, and has high rigidity in which axially opposite side portions of the outer peripheral wall surface and a rotating shaft are connected by a fan-shaped side plate. It is formed by polypropylene.

The lip seal 10 is a substantially U-shaped elastic sealing material fixed to both ends of the door substrate 9 in the rotating direction. The lip seal 10 is made of a synthetic resin-based elastomer compatible with the door substrate 9 (for example, a thermoplastic elastomer). It was formed. The two lip seals 10 are shown in FIG.
As shown in FIG. 1, the surfaces passing through the door rotation shaft 11 (FIG. 1)
Outside of the dashed line A) is offset by the dimension a. Specifically, each lip seal 10
Is offset from the center of the door rotation shaft 11 to the outside of the door substrate 9 by the dimension a in FIG.

A bank 12 which comes into contact with the lip seal 10 when the rotary door 8 is opened and closed is provided on the inner surface of the inside / outside air switching box 7.
Is provided. This bank 12 has a lip seal 1
0 is inclined at a predetermined angle (for example, 45 °) and is provided in parallel with the lip seal 10 that is offset, and the two lip seals 10 are offset outward. Therefore, as shown in FIG. 5, the banks 12 having the sealing surfaces on both sides can be reduced to a necessary minimum (when not offset to the outside, 2
The bank α is large, as shown by the dotted line). As described above, since the size of the bank 12 provided on the case side can be reduced, the opening area of the air passages (the inside air inlet 7A and the outside air inlet 7B) opened and closed by the rotary door 8 can be increased.

The lip seal 10 is offset from the surface passing through the door rotation shaft 11 and the bank 12 is provided in parallel with the lip seal 10, so that the shut amount of the lip seal 10 can be reduced. It is properly maintained from the 11th side to the outer periphery of the door. In addition, by changing the shape of the bank 12 between the door rotation shaft 11 side and the outer peripheral side, the shut amount can be changed inside and outside the rotary door 8.

In the above embodiment, an example is shown in which the present invention is applied to the inside / outside air switching means 1. However, the present invention may be applied to other parts of the vehicle air conditioning unit. It may be applied to a passage switching device.

[Brief description of the drawings]

FIG. 1 is a side view of a rotary door.

FIG. 2 is a cross-sectional view of the blower unit showing a inside air mode.

FIG. 3 is a cross-sectional view of the blower unit showing an outside air mode.

FIG. 4 is an explanatory diagram of an offset amount.

FIG. 5 is an explanatory diagram of a bank.

[Explanation of symbols]

 7 Inside / outside air switching box (case in which a bank is provided) 8 Rotary door 9 Door board 10 Lip seal 11 Door rotation axis 12 Bank

Claims (1)

[Claims] 1. An air passage switching device for opening and closing an air passage by a rotary door, wherein a lip seal made of an elastic body is provided at both ends in a rotation direction of a door substrate constituting the rotary door, and A bank that contacts the lip seal when the rotary door is opened and closed is provided on the case side that forms the passage, and the lip seal is offset from a plane passing through the door rotation axis. Air passage switching device.