JPH07205637A - Air flow switching device - Google Patents

Abstract

PURPOSE:To prevent occurrence of abnormal sound following the face change of a film damper during the moving period of the film-damper in an air flow switching device using the film damper having flexibility. CONSTITUTION:A spit hole switching means to switch a spit hole is provided with a film damper 15 having flexibility, a pair of winding axes to fix both the ends of the film damper 15 and an intermediate axis 18 to support the film damper 15 between the winding axes. The intermediate axis 18 is prepared in such a way that the whole intermediate axis 18 is formed in a loose convex shape in the axis direction in advance so that an outer shape to support the film damper 15 becomes in an approximate linear shape when the intermediate axis 18 is flexed because the intermediate axis 18 is flexed by taking a pressure force during the removing period of the film damper 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air flow switching device for switching the flow direction of air by means of a flexible film member.

[0002]

2. Description of the Related Art Conventionally, as an air flow switching device applied to a vehicle air conditioner, a device using a flexible film damper 100 as shown in FIG. 10 is known. The film damper 100 includes two winding shafts 101 (1
01a, 101b) and the intermediate shaft 102, and one winding shaft 101a or the other winding shaft 101a.
The air vents 104 and 105 are selectively opened and closed by moving in parallel along the air vents 104 and 105 formed in the case 103 while being wound around b. In the air flow switching device using the film damper 100, since the film damper 100 has flexibility, the bending angle θ of the film damper 100 can be set relatively freely by the intermediate shaft 102, and the layout of the layout can be improved. It is characterized by a high degree of freedom.

[0003]

In the air flow switching device using the film damper 100 described above, it is desirable that the intermediate shaft 102 has a small diameter in order to improve space efficiency. On the other hand, the winding shaft 101 requires a shaft diameter that is somewhat large,
The diameter is preferably larger than that of the intermediate shaft 102. The reason (the reason for increasing the shaft diameter of the winding shaft 101) will be described in detail below.

When the shaft diameter of the winding shaft 101 is reduced (see FIG. 11), the radius of curvature of the film damper 100 wound on the outer periphery of the winding shaft 101 becomes smaller (the bending angle of the film damper 100 becomes smaller). , Winding shaft 101
The force by which the film damper 100 expands (see FIG. 12).
The force to get into the state like) becomes larger. Therefore,
In order to prevent the state as shown in FIG. 12, it is necessary to always apply a force to the winding shaft 101 in the clockwise direction (the direction indicated by the broken line arrow in FIG. 12). Under such a situation,
When the winding shaft 101 is rotated counterclockwise to move the film damper 100 in the direction shown by the solid arrow in FIG. 12, the clockwise force described above becomes a resistance and the operating force is increased. Will become bigger. Therefore, in order to reduce the operating force, it can be said that the shaft diameter of the winding shaft 101 should be large to some extent.

When the winding shaft 101 has a small diameter, the amount of the film damper 100 wound around the winding shaft 101 increases when the film damper 100 is moved from one end to the other. Therefore, the outer diameter of the winding shaft 101 in a state where the film damper 100 is not wound and the film damper 1
The difference from the winding diameter in the state of winding 00 is large. Now, as shown in FIG. 13, the case 103 and the winding shaft 1
If there is almost no distance from 01, it is good when the film damper 100 is not wound on the winding shaft 101, but when the film damper 100 is wound on the winding shaft 101, The film damper 100 wound around 101 comes into contact with the case 103, and as a result,
When the film damper 100 moves, the film damper 100
Rubbing against the case 103 causes a sliding sound.

On the contrary, as shown in FIG.
When the distance between the take-up shaft 101 and the take-up shaft 101 is large, the above sliding noise is eliminated, but when the film damper 100 is hardly taken up by the take-up shaft 101, the film damper 100 and the case 103 are not wound. Since the interval between and becomes large, the sealing property deteriorates. Considering both the sliding noise and the sealing property, it is better that the difference in the winding diameter when the film damper 100 is moved from one end to the other is smaller. To achieve this, the winding shaft is required. It is desirable to increase the shaft diameter of 101.

If the shaft diameter of the winding shaft 101 is reduced,
As described above, since the radius of curvature of the film damper 100 wound around the winding shaft 101 is small, when the film damper 100 has a multilayer structure as shown in FIG. 15, the layers tend to separate from each other. Because the power becomes large,
The durability of the film damper 100 is reduced. Therefore, in order to reduce the force acting between the layers of the film damper 100 and improve the durability of the film damper 100, it is better to increase the shaft diameter of the winding shaft 101.

When the winding shaft 101 is driven to rotate by a servomotor, a potentiometer is used as a position detecting means for the winding shaft 101. However, since the potentiometer cannot usually detect a rotation angle of 360 ° or more, it is desirable to increase the shaft diameter of the winding shaft 101 and reduce the rotation angle of the winding shaft 101. Further, in order to detect the rotation of the winding shaft 101 by 360 ° or more with the potentiometer, a “mechanism for reducing the number of rotations” is required between the winding shaft 101 and the potentiometer. And if the deceleration ratio is increased, the winding shaft 1
The deviation between the actual position of 01 and the detected position of the potentiometer becomes large. From these meanings as well, the winding shaft 10
The larger the shaft diameter of 1, the better.

For the above reasons, the film damper 100
In the air flow switching device using, it is preferable that the shaft diameter of the intermediate shaft is small and the shaft diameter of the winding shaft 101 is large. In this airflow switching device, when the film damper 100 is moved, tension is applied to the film damper 100, so that a pressing force (see FIG. 2) acts on the intermediate shaft 102. Therefore, when the intermediate shaft 102 has a small diameter and the intermediate shaft 102 is bent by the pressing force acting on the intermediate shaft 102,
As shown in FIG.
Has a concave shape.

On the other hand, since the winding shaft 101 having a large shaft diameter is less likely to bend, the film damper 100 on the winding shaft 101 tries to maintain a planar shape (see FIG. 17).
As a result, the film damper 100 undergoes a surface change (concave shape and plane shape) between the winding shaft 101 and the intermediate shaft 102 during its movement, and thus abnormal noise is generated due to the surface change. There's a problem. The present invention has been made based on the above circumstances, and an object thereof is an air flow switching device using a flexible film member, which is accompanied by a surface change of the film member when the film member is moved. It is to prevent the generation of abnormal noise.

[0011]

To achieve the above object, the present invention according to claim 1 provides an air passage, and one winding shaft and the other winding shaft supported in the air passage. ,
A flexible film-shaped member that is stretched in the air passage by these winding shafts and has a ventilation opening, and is supported in the air passage to support the one winding shaft and the other winding shaft. The intermediate support means for supporting the film-shaped member in a bent state between the film-shaped member and the take-up shaft, and the moving means for moving the film-shaped member, wherein the intermediate support means moves the film-shaped member. The outer shape that supports the film-shaped member in the width direction of the film-shaped member orthogonal to the direction is provided so as to form a gentle convex shape as a whole, and the film-shaped member is formed by the pressing force applied when the film-shaped member moves. The technical means is that the outer shape that supports the member is provided so as to bend until it becomes a substantially linear shape.

According to the present invention as set forth in claim 2, the air passage, the one winding shaft and the other winding shaft supported in the air passage, and the winding shaft stretched in the air passage by these winding shafts. And a flexible film-like member having a ventilation opening,
An intermediate supporting unit that is supported in the air passage and that supports the film-shaped member in a bent state between the one winding shaft and the other winding shaft, and moves the film-shaped member. The technical means is that the intermediate support means is supported in a substantially non-deformable state against the pressing force applied when the film-shaped member is moved.

According to a third aspect of the present invention, the intermediate supporting means according to the second aspect is supported at both end portions in the width direction of the film-shaped member orthogonal to the moving direction of the film-shaped member, and both ends thereof. There is at least one support between the sections.

According to a fourth aspect of the present invention, an air passage, one winding shaft and the other winding shaft supported in the air passage, and the winding shaft are stretched in the air passage by these winding shafts. And a flexible film-like member having a ventilation opening,
An intermediate supporting unit that is supported in the air passage and that supports the film-shaped member in a bent state between the one winding shaft and the other winding shaft, and moves the film-shaped member. Moving means, wherein the intermediate supporting means has a film shape in which an outer shape for supporting the film member against a pressing force applied when the film member moves is orthogonal to a moving direction of the film member. The technical means is to have a rigidity capable of maintaining a substantially linear shape in the width direction of the member.

[0015]

According to the present invention as set forth in claim 1, the intermediate supporting means provided in a convex shape having a gentle outer shape for supporting the film-shaped member in the width direction of the film-shaped member applies a pressing force when the film-shaped member is moved. Is provided so that the outer shape forming the convex shape becomes substantially linear.

According to the second aspect of the present invention, the intermediate supporting means for supporting the film-shaped member in a bent state between one winding shaft and the other winding shaft is added when the film-shaped member is moved. It is supported in a state in which it is hardly deformable (does not bend) with respect to the pressing force. According to the present invention as set forth in claim 3, the intermediate supporting means as set forth in claim 2 is supported at both end portions in the width direction of the film-shaped member and is supported at least at one place between the both end portions. It is possible to prevent deformation (deflection) with respect to the pressing force applied when the film member is moved.

According to a fourth aspect of the present invention, intermediate supporting means for supporting the film-shaped member in a bent state between one winding shaft and the other winding shaft is added when the film-shaped member moves. Since the film has rigidity against the pressing force, the outer shape supporting the film member can be kept substantially linear even if the pressing force is applied when the film member is moved.

In the present invention as set forth in claims 1 to 4, the intermediate support means does not exist on a straight line connecting one winding shaft and the other winding shaft, but one winding shaft. And the other winding shaft, the film-shaped member is supported in a bent state. That is, the "bending" here means the moving direction of the film member moving between one winding shaft and the intermediate supporting means, and the film moving between the other winding shaft and the intermediate supporting means. The state in which the film-shaped member is supported by the intermediate support means so that the moving direction of the film-shaped member changes.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a vehicle air conditioner to which the air flow switching device of the present invention is applied will be described with reference to FIGS. FIG. 1 is a schematic view of a vehicle air conditioner. The vehicle air conditioner 1 of the present embodiment includes a unit case 2 that guides blown air into the passenger compartment, a blower (not shown) that introduces air into the unit case 2 and sends the air into the passenger compartment, and cools the blown air. Cooler 3, heater 4 for heating blast air,
A temperature adjusting means (described later), an outlet switching means (described later), etc. are provided.

In the unit case 2 as an air passage,
A defroster outlet 5 for blowing air toward the window glass of the vehicle, a face outlet 6 for blowing air toward the upper body of the occupant, and a foot outlet 7 for blowing air toward the feet of the occupant are provided. Each of the air outlets 5 to 7 is connected to each of the air outlets (not shown) opening into the vehicle compartment via a communication duct (not shown).

In the unit case 2, a cold air bypass port 8 forming a cold air bypass passage for guiding the air cooled by the cooler 3 directly to the defroster outlet 5 and a quantity of cold air passing through the cold air bypass port 8 are provided. A cool air bypass amount adjusting means for adjusting, specifically, a cool air bypass damper 9 is provided. The cold air bypass damper 9 is a plate-like damper having a size capable of closing the cold air bypass port 8, and one end thereof includes the shaft 10.
Is fixed to the shaft 10 and rotates integrally with the shaft 10 about the shaft 10. The shaft 10 is rotatably supported by the unit case 2 and is rotationally driven by a driving unit (not shown), specifically, a servomotor.

The cooler 3 is a refrigerant evaporator of the refrigeration cycle and is arranged in the unit case 2 at the lee side of the blower, and cools the air sent from the blower by heat exchange with a low-temperature low-pressure refrigerant. The heater 4 is a heater core interposed in a hot water circuit in which engine cooling water circulates, and is arranged in a leeward of the refrigerant evaporator in the unit case 2, and heats the air passing through the refrigerant evaporator with the engine cooling water. Heat by replacement. The heater 4 is arranged so that the detour 11 is formed in the unit case 2. Detour 11
Is a passage through which the air passing through the cooler 3 can bypass the heater 4 and flow. In this embodiment, a first bypass 11a and a second bypass 11b are formed on both sides of the heater 4. ing.

Temperature control means (air flow switching device of the present invention)
Is for adjusting the ratio of the amount of air flowing through the detour 11 and the amount of air passing through the heater 4. The film member having flexibility, specifically, the film damper 12, and the film damper 12 are wound. It comprises a pair of winding shafts 13 and 14 for winding, and a servomotor (not shown) for rotationally driving one winding shaft 14.

The film damper 12 comprises two winding shafts 1.
As shown in FIG. 1, both ends of the first and second detour circuits 11a and 11b are fixed to the first detour circuit 11a and the second detour circuit 11b while being supported by the side wall 4a of the heater 4 while being fixed to both ends of the heater 3 and 14 by the windward side of the heater 4. It is arranged so as to block the. This film damper 12
An opening 12a for passing the blown air is provided, and the opening 12a is moved as the film damper 12 moves.
Is displaced, and the ratio between the amount of air passing through the heater 4 and the amount of air passing through the bypass 11 is determined according to the position of the opening 12a.

The winding shafts 13 and 14 are rotatably supported by the unit case 2, and when one winding shaft 13 is rotationally driven by a servomotor, the other winding shaft 14 can be interlocked. The winding shafts 13 and 14 are connected to each other by a wire (not shown). The take-up shafts 13 and 14 have rigidity against the pressing force applied to the take-up shafts 13 and 14 when the film damper 12 moves. In other words, the shaft diameter is set so that the winding shafts 13 and 14 hardly bend even when a pressing force is applied thereto.

The servomotor rotationally drives the winding shaft 13 by a predetermined rotation angle according to the output of an air conditioner control device (not shown). In this embodiment, the moving means of the present invention is composed of the servo motor and the wire. As the moving means, the winding shafts 13 and 14 may be provided with driving means such as a servo motor and a step motor, respectively.
Alternatively, as in the present embodiment, a drive means is provided on one winding shaft 13 to transmit the movement of the one winding shaft 13 to the other winding shaft 14 (for example, shown in this embodiment. Wire) may be provided.

Air outlet switching means (airflow switching device of the present invention)
Is to selectively open and close each of the air outlets 5 to 7 provided in the unit case 2, and has a flexible film member, specifically, the film damper 15, and a film damper 15 for winding the film damper 15. It comprises a pair of take-up shafts 16 and 17, a servomotor (not shown) that rotationally drives one take-up shaft 16, and an intermediate shaft 18 that supports the film damper 15 between the take-up shafts 16 and 17.

The film damper 15 comprises two winding shafts 1.
Both ends are fixed to 6 and 17, and as shown in FIG. 1, they are arranged so that each of the outlets 5 to 7 can be closed. The film damper 15 is provided with an opening 15a for allowing blown air to pass through, and the position of the opening 15a is displaced as the film damper 15 moves, and the opening 15a is moved.
The outlets 5 to 7 are selectively opened and closed according to the position of a.

The winding shafts 16 and 17 are rotatably supported by the unit case 2, so that when one winding shaft 16 is rotationally driven by a servomotor, the other winding shaft 17 can be interlocked. The winding shafts 16 and 17 are connected to each other by a wire (not shown). The take-up shafts 16 and 17 have rigidity against the pressing force applied to the take-up shafts 16 and 17 when the film damper 15 moves. That is, the shaft diameter is set so that the winding shafts 16 and 17 are hardly bent even when a pressing force is applied to them.

The servo motor rotationally drives the winding shaft 16 by a predetermined rotation angle in accordance with the output of the air conditioner controller. In this embodiment, the moving means of the present invention is composed of the servo motor and the wire. As the moving means, the winding shafts 16 and 17 may be provided with driving means such as a servo motor and a step motor, respectively. Alternatively, as in this embodiment, one winding shaft 16 is provided with a driving means,
You may provide the transmission means (for example, the wire shown in this Example) which transmits the movement of the one winding shaft 16 to the other winding shaft 17.

The intermediate shaft 18 constituting the intermediate supporting means is supported in a state in which the film damper 15 is bent between the winding shafts 16 and 17 so that the film damper 15 can selectively open and close the outlets 5 to 7. However, the film damper 15 is provided so as to follow the inner shape of the unit case 2. Both ends of the intermediate shaft 18 are rotatably supported by the unit case 2, and are bent when a pressing force (shown by an arrow in FIG. 2) is applied when the film damper 15 moves. Therefore, in this embodiment, the intermediate shaft 1 is pressed by the pressing force.
8 is bent so that the outer shape in the axial direction supporting the film damper 15 becomes a substantially linear shape, the intermediate shaft 18 as a whole has a gentle convex shape in advance in the axial direction (the axial direction from both ends to the central part). It is provided so as to form a medium-thick shape whose diameter gradually increases (see FIG. 3).

The film dampers 12 and 15 used in the above-mentioned temperature adjusting means and outlet switching means are, for example, P
Ny cloth is adhered to both sides of the PS film, and the surface of the Ny cloth is coated with Si rubber to form a multi-layer structure, which has a total film thickness of about 200 μm.

Next, the operation of this embodiment will be described. The air sent from the blower to the unit case 2 is cooled by the cooler 3 and then passes through the bypass 11 or the heater 4 according to the air volume ratio determined by the temperature adjusting means. In the temperature adjusting means, the opening 1 provided in the film damper 12 is used.
The opening ratios of the bypass 11 and the heater 4 (ventilation surface) are determined according to the position of 2a. The film damper 12
The servo motor rotationally drives the take-up shaft 13 in response to the output of the air conditioner control device, so that the take-up shaft 13 moves between the take-up shafts 13 and 14 according to the rotation angle of the take-up shaft 13.

According to the opening ratios of the bypass 11 and the heater 4, the cold air flowing through the bypass 11 and the hot air heated by passing through the heater 4 are mixed downstream of the heater 4 and then blown out from the outlet. It is blown out from the air outlet opened by the switching means, for example, the face air outlet 6, and is blown out into the vehicle compartment through the communication duct. The blower outlet switching means is a film damper 15.
Depending on the position of the opening 15a provided in the
Open and close ~ 7 selectively. In the film damper 15, the servo motor receives the output of the air conditioner control device and the servo motor takes up the winding shaft 16.
By rotating the winding shaft 16, the winding shaft 16 moves between the winding shafts 16 and 17 in accordance with the rotation angle of the winding shaft 16.

In the above-described operation, in the blowout port switching means, the pressing force F as shown by the arrow in FIG. 2 acts on the intermediate shaft 18 when the film damper 15 moves, so that both ends are supported by the unit case 2. The intermediate shaft 18 is bent by the pressing force F. Here, the intermediate shaft 1 of the present embodiment
8 is provided so as to form a gentle convex shape in the axial direction as a whole, and when the pressing force F is applied to bend the external shape, the external shape for supporting the film damper 15 is the axial direction, as shown in FIG. Has a substantially linear shape.

As a result, even if the intermediate shaft 18 bends during the movement of the film damper 15, the film damper 15 can maintain its planar shape (see FIG. 4) on the intermediate shaft 18. On the other hand, the winding shafts 16 and 17 can wind the film damper 15 in a flat state with almost no bending when the film damper 15 is moved. Therefore, each winding shaft 1
The surface change does not occur in the film damper 15 between the Nos. 6 and 17 and the intermediate shaft 18, and no abnormal noise is generated due to the surface change.

In the temperature adjusting means, since the film damper 12 is supported by the side wall 4a of the heater 4 between the winding shafts 13 and 14, the film damper 12 is pushed against the side wall 4a of the heater 4 when the film damper 12 moves. Although the pressure F acts, the side wall 4a is not deformed (flexed) by the pressing force F, and the film damper 12 can be supported in a flat state. Therefore, in the temperature adjusting means, the film damper 12 does not change its surface as the film damper 12 moves, and no abnormal noise is generated.

Next, a second embodiment of the present invention will be described. FIG. 5 is a sectional view of the outlet switching means according to the second embodiment. The outlet switching means of this embodiment supports the film damper 15 between the winding shafts 16 and 17 by the frame 19. The frame 19 shown in FIG. 5 does not have a cross-sectional shape but a side surface shape of the frame 19.

The frame 19 constituting the intermediate supporting means is
Two intermediate frames 19a that directly support the film damper 15 and both side frames 19b that support the intermediate frame 19a by fixing both ends of the intermediate frame 19a.
(See FIG. 6 and a sectional view taken along line AA in FIG. 5). The intermediate frame 19a is bent by the force pressing the intermediate frame 19a when the film damper 15 moves. Therefore, the intermediate frame 19a is preliminarily provided with a gentle convexity in the width direction of the film damper 15 (left-right direction in FIG. 6) so that the outer shape that supports the film damper 15 becomes substantially linear when the intermediate frame 19a is bent. It is provided so as to form a shape.

As a result, even if the intermediate frame 19a bends when the film damper 15 moves, as shown in FIG.
Since the film damper 15 can be supported in a planar shape on the intermediate frame 19a, the film damper 15 does not change its surface between the take-up shafts 16 and 17 and the intermediate frame 19a. It is possible to prevent the generation of abnormal noise.

Next, a third embodiment of the present invention will be described. FIG. 8 is a sectional view of the outlet switching means according to the third embodiment. The outlet switching means of this embodiment supports both ends of the intermediate shaft 18 by the unit case 2 and at least one place (two places in FIG. 8) between the ends by the case, the rib 20 and the like. To do. As a result, the film damper 15
Since the rigidity of the intermediate shaft 18 is improved with respect to the pressing force F applied during the movement of the intermediate shaft 18, the intermediate shaft 18 when the pressing force F is applied.
The deformation (flexure) of the film damper 15 is suppressed, and the generation of abnormal noise due to the surface change of the film damper 15 can be prevented. In addition,
In the case of the present embodiment, as shown in FIG. 9, the same effect can be obtained even if the intermediate shaft 18 is divided and used in the axial direction.

[Modification] In the first embodiment, both ends of the intermediate shaft 18 are rotatably supported by the unit case 2, but the intermediate shaft 18 does not necessarily have to be rotatably supported. Alternatively, it may be fixed to the unit case 2. In this case, the intermediate shaft 18 may have a medium-thickness shape as in the above-described embodiment, but since the intermediate shaft 18 does not rotate, only the side supporting the film damper 15 may have a gentle convex shape in the axial direction. Further, the intermediate shaft 18 may be made of a material (for example, metal) that is rigid with respect to the pressing force F so that the intermediate shaft 18 does not bend even if the pressing force F is applied when the film damper 15 moves.

[0043]

In the air flow switching device of the present invention, the intermediate support means for supporting the film member between the one winding shaft and the other winding shaft moves the film member when the film member moves. It can be supported in a planar shape. Thus, the film member does not change its surface between the take-up shafts and the intermediate support means when the film member moves, and thus it is possible to prevent the generation of abnormal noise due to the surface change.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a vehicle air conditioner according to a first embodiment.

FIG. 2 is an explanatory diagram showing a force acting on an intermediate shaft when the film damper moves.

FIG. 3 is a cross-sectional view showing the shape of an intermediate shaft (first embodiment).

FIG. 4 is a cross-sectional view showing a state in which the intermediate shaft is bent (first
Example).

FIG. 5 is a cross-sectional view of an outlet switching unit according to the second embodiment.

FIG. 6 is a cross-sectional view showing the shape of the intermediate frame (second)
Example).

FIG. 7 is a sectional view showing the shape of the intermediate frame when the film damper is moved (second embodiment).

FIG. 8 is a sectional view of an outlet switching unit according to a third embodiment.

FIG. 9 is a sectional view showing a modification of the intermediate shaft according to the third embodiment.

FIG. 10 is a cross-sectional view of an airflow switching device according to the related art.

FIG. 11 is a view showing a state in which the film damper is wound around a winding shaft having a small diameter.

FIG. 12 is a diagram showing a state in which the film damper wound on the winding shaft is about to expand.

FIG. 13 is a cross-sectional view when the distance between the winding shaft and the case is small.

FIG. 14 is a cross-sectional view when the distance between the winding shaft and the case is large.

FIG. 15 is a cross-sectional view of a film damper having a multilayer structure.

FIG. 16 is a cross-sectional view showing a state where the intermediate shaft is bent (prior art).

FIG. 17 is a cross-sectional view of a winding shaft that winds a film damper (prior art).

[Explanation of symbols]

 2 unit case (air passage) 4a side wall (intermediate supporting means) 12 film damper (membrane member) 12a opening (ventilation opening) 13 one winding shaft 14 the other winding shaft 15 film damper (membrane member) 15a Opening (opening for ventilation) 16 One winding shaft 17 The other winding shaft 18 Intermediate shaft (intermediate supporting means) 19a Intermediate frame (intermediate supporting means)

Claims (4)

[Claims] 1. An air passage, one winding shaft and the other winding shaft supported in the air passage, and the winding shaft stretched in the air passage by these winding shafts to form a ventilation opening. The formed flexible film-like member, and being supported in the air passage, supports the film-like member in a bent state between the one winding shaft and the other winding shaft. An intermediate supporting means and a moving means for moving the film member, wherein the intermediate supporting means supports the film member in a width direction of the film member orthogonal to a moving direction of the film member. The shape is provided so as to form a gentle convex shape, and the pressing force applied when the film-shaped member is moved is bent so that the outer shape supporting the film-shaped member becomes substantially linear. Air flow switching device. 2. An air passage, one winding shaft and the other winding shaft supported in the air passage, and the winding shaft stretched in the air passage by these winding shafts, and an opening for ventilation is provided. The formed flexible film-like member, and being supported in the air passage, supports the film-like member in a bent state between the one winding shaft and the other winding shaft. An intermediate support means and a moving means for moving the film-shaped member are provided, and the intermediate support means is supported in an almost undeformable state against a pressing force applied when the film-shaped member is moved. Air flow switching device. 3. The air flow switching device according to claim 2, wherein the intermediate support means is supported at both end portions in the width direction of the film member orthogonal to the moving direction of the film member, and both ends thereof. It is characterized in that it is supported at least at one place between the parts. 4. An air passage, one take-up shaft and the other take-up shaft supported in the air passage, and the take-up shaft stretches the air passage by the take-up shaft to form a ventilation opening. The formed flexible film-like member, and being supported in the air passage, supports the film-like member in a bent state between the one winding shaft and the other winding shaft. An intermediate support means and a moving means for moving the film-shaped member, wherein the intermediate support means has an outer shape for supporting the film-shaped member against a pressing force applied when the film-shaped member is moved, An air flow switching device having a rigidity capable of maintaining a substantially linear shape in a width direction of the film-shaped member orthogonal to a moving direction of the film-shaped member.