JPH11198632A - Air passage switching device and vehicular air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress increase in door operating force due to the deformation of a film member by means of wind pressure, in this air passage switching device which uses a film type rotary door. SOLUTION: A bend 92k is installed in at least one end side of both ends in the circumferential direction of a film member 92, and this bend 92k is locked to a rotary door 91, while a bend radius R of this bend 92k should be set up in a range of 6 to 8 mm. Therefore, in proportion as enlarging this bend radius R, load of wind pressure is dispersible in a wide range, and thereby an amount of deformation in a circular angular part 92f of the bent 92k becomes lessened, so door operating force is thus reducible. Accordingly, the bend radius R should be set to more than 6 mm. In addition, in order to secure a sealing effect, an upper limit of the bend radius R should be set to less than 8 mm.

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 and a vehicle air conditioner using the same, and more particularly to an air passage switching device using a film type rotary door.

[0002]

2. Description of the Related Art The present applicant has previously disclosed Japanese Patent Application Laid-Open No. H8-25945.
In Japanese Patent Laid-Open Publication No. H11-264, an air passage switching device that switches a plurality of blow-off air passage openings at a film type rotary door is proposed. In this conventional device, a rotary door having an arc-shaped outer peripheral surface is rotatably provided in a case so as to face a plurality of blow-off air passage openings, and a film member is provided on the outer peripheral portion of the rotary door. In addition, a door vent for applying wind pressure to the film member is opened in the outer peripheral portion of the rotary door. Further, the film member is provided with a film opening which can communicate with the blowing air passage opening.

[0003] Then, by rotating the rotary door and selecting the rotation position, a plurality of blow-off air passage openings are selectively opened and closed. That is, the portion of the film member having no film opening is pressed against the peripheral edge of the blowing air passage opening on the case side by wind pressure, thereby closing the blowing air passage opening with the film member. The opening and the opening of the blow-off air passage are overlapped with each other so that they communicate with each other to open the air passage.

[0004]

However, in the above-mentioned conventional apparatus, when the present inventors actually made a prototype and examined it, it was found that the following problems occurred. That is, in the conventional device, an arc-shaped bent portion is formed at the circumferential end of the film member, and the arc-shaped bent portion is fixed to the circumferential end of the rotary door. Since the member is a thin film member formed of a flexible resin material, the member is relatively easily deformed. Therefore, if the bending radius R of the arc-shaped bent portion is small, wind pressure concentrates on the corner portion of the bent portion, and this corner portion is largely deformed (extends) to the outer peripheral side, and the blow-out air passage opening portion on the case side is formed. The phenomenon of climbing over the partition wall tip (seal portion) occurs. As a result, it has been found that the frictional force at the riding portion increases, which causes a problem of increasing the operating force of the rotary door.

In view of the above, the present invention has been made in view of the above, and in an air passage switching device using a film type rotary door, a door caused by deformation of an arcuate bent portion formed at a circumferential end of a film member. An object is to suppress an increase in operating force.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, at least one of the circumferential ends of the film member (92) has a bent portion (9).
2k), the bent portion (92k) is fixed to the rotary door (91), and the bending radius R of the bent portion (92k) is set in the range of 6 to 8 mm.

According to an experimental study by the present inventor, the bent portion (9
2k), the bend radius (9
It was found that when the wind pressure load was dispersed over a wide range of 2k), the amount of deformation of the corner (92f) of the bent portion (92k) toward the outer peripheral side was reduced, and the door operating force could be reduced (see FIG. 12). . Therefore, by setting the bending radius R to 6 mm or more, an increase in door operating force can be effectively suppressed.

By setting the upper limit of the bending radius R to 8 mm or less, a sealing effect can be ensured when the air passage is closed by the film member (92), and air leakage can be prevented. According to the present invention, as the air passage openings, the blow-off air passage opening for the face (5), the blow-off air passage opening for the foot (6), and the blow-off air passage opening for the defroster ( 7), and the blow-out air passage openings (5, 6, 7) can be suitably implemented in a vehicle air conditioner that opens and closes with a film member (92) and a rotary door (91).

[0009] The reference numerals in parentheses of the above means indicate the correspondence with specific means described in the embodiment described later.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an overall configuration of a ventilation system in an embodiment in which the present invention is applied to a vehicle air conditioner (car air conditioner). A case 10 forms an air passage of the air conditioner. Is usually installed in an instrument panel (not shown) at the front of the passenger compartment. In the case 1, a blower 2 as a blower is disposed in the upper right part (upper part on the front side of the vehicle) in FIG.

The blower 2 is composed of a well-known centrifugal multi-blade fan driven by a motor.
Case 1 through an intake duct (not shown) connected to
Air is sucked into the inside and blown in the direction of arrow A. Here, the intake side duct is provided with an evaporator as cooling means for cooling the blown air, and further provided with an inside air intake and an outside air intake on the air upstream side of the evaporator. An inside / outside air switching door that opens one of the intakes is provided. The evaporator is provided in a refrigeration cycle having a compressor driven by a vehicle engine, and cools the blown air by the latent heat of evaporation of the refrigerant.

As shown in FIG. 1, a heater core 3 as a heating means is disposed in a substantially horizontal direction in a lower portion on the right side of FIG. This heater core 3 is used for cooling water (hot water) of a vehicle engine.
Are circulated by a pump (not shown) to heat the blown air using the engine cooling water as a heat source. And
An air mixing door 4 is provided at an upstream portion of the heater core 3 on the air side. The air mix door 4 controls the temperature of the air blown into the vehicle interior by rotating about the rotation shaft 4a in the direction of arrow X in FIG. 1, and constitutes a temperature control means. The opening of the air mix door 4 is adjusted to a degree corresponding to the air conditioning conditions by a manual operation of an occupant or an automatic temperature control signal of an air conditioning control device.

According to the degree of opening of the air mix door 4,
Of the air blown in the direction of arrow A by the blower 2, the hot air flowing through the heater core 3 through the warm air passage 100 in the direction of arrow B and the cool air flowing through the cool air passage 101 through the heater core 3 in the direction of arrow C without passing through the heater core 3. The air volume ratio is adjusted. In most cases, the cool air and the hot air flowing through the passages 100 and 101 are satisfactorily air-mixed in an arc-shaped rotary door 91 described later.

On the other hand, in the case 1, a plurality of, in this example, three, outlet air passage openings 5, 6, 7 are provided at the upper left portion (upper portion on the rear side of the vehicle) of FIG. The rotary door 91 is provided so as to be adjacently arranged in the rotation direction (circumferential direction) of the rotary door 91 in the rotation area. Therefore, the blow-off air passage opening 5 on the case 1 side,
The distal end portions 8 of the partition walls forming the parts 6 and 7 are formed so as to be located on an arc surface.

An outlet air passage opening 5 located in the middle of the rotary direction of the rotary door 91 is a face outlet (shown in the figure) which is disposed above the instrument panel in the vehicle compartment and blows air toward the upper body of the occupant. No) Face outlet duct 1
It is communicated by 0. In the direction of rotation of the rotary door 91, a blowing air passage opening 6 located on the rearmost side of the vehicle is disposed below the instrument panel of the vehicle interior, and is a foot outlet (shown in the drawing) for blowing air toward the lower body of the occupant. No) is communicated with the foot outlet duct 11.

The opening 7 of the blow-off air passage, which is located closest to the front of the vehicle in the direction of rotation of the rotary door 91, is disposed on the upper surface of the instrument panel in the vehicle interior and close to the glass surface of the vehicle. A defroster outlet (not shown) for blowing out conditioned air toward the inner surface of the glass or side glass is communicated with a defroster duct 12. The three outlet air passage openings 5, 6, 7 described above are:
Each of them is formed in a substantially rectangular shape whose longitudinal direction is the direction perpendicular to the paper surface of FIG.

When the blower 2 is driven, the inside air or the outside air is sucked from the intake side duct and guided into the case 1 through the evaporator, and the inside of the case 1 is further aired as indicated by arrows A, B and C. Flows, and the ratio of the amount of cool air to the amount of warm air is adjusted by the opening of the air mix door 4 to obtain a desired blown air temperature. Then, the blown air is blown out from each blowout port in the vehicle through one of the blowout air passage openings 5, 6, 7. In the present embodiment, five blowout modes described later can be selected by the three blowout air passage openings 5, 6, and 7.

In the case 1, there is provided an air passage switching device 9 for controlling the opening and closing of the three blow-off air passage openings 5, 6, 7 and the opening area thereof. Hereinafter, the air passage switching device 9 according to the present embodiment will be described.
This will be described in detail with reference to FIGS. The air passage switching device 9 includes a rotary door 91 and a film member 92 which constitute a rotary door of the present invention.

The rotary door 91 is made of, for example, resin and has two substantially semicircular end plate portions 91a, 91a and an arc shape having an arc range of approximately 180 ° as shown in FIGS. It has a so-called vertical semi-cylindrical shape integrally formed with the peripheral wall 91b. Further, the end plate portion 91
Rotation shafts 91c, 91c are provided on the a, 91a at the center of curvature of the circular arc of the circumferential wall 91b, and protrude outward in the axial direction.

As shown in FIG. 4 and the like, four axially elongated door vents 91d are formed at substantially equal intervals in the circumferential wall 91b. Thus, the circumferential wall 91b has elongated beams 91e extending in the axial direction at two places at both ends in the circumferential direction and three places between the door ventilation ports 91d, and most of the remaining portions are open. It is in the form of. The semicircular end plate portions 91a, 91a
As shown in FIG. 2, a reinforcing rib 91f is formed so as to protrude from a.

The rotary door 91 has a circumferential wall 91.
A pin member (attachment means) 91g for attaching one end in the circumferential direction of the film member 92 is provided at one end in the circumferential direction (the right end in the drawing) of b. 91g of this pin member
Is a cylindrical shape, and as shown in FIG. 4, a plurality of pins 91g project downward from the lower end of the rotary door 91, and the plurality of pin members 91g are integrally formed on the rotary door 91 in a line in the axial direction. Have been.

A slide wall 91h is provided at the other end (left end in the figure) of the circumferential wall 91b of the rotary door 91 in the circumferential direction. This sliding wall portion 91h
As shown in FIG. 4, the sliding door 91 h projects downward from the lower end of the rotary door 91, and the outer peripheral surface of the sliding wall 91 h is formed in an arc surface along the arc shape formed by the film member 92. A large number of pin members 91i protrude outward from the outer peripheral surface of the wall portion 91h.
Are formed integrally in a line in the axial direction.

On the other hand, the film member 92 is formed of a resin material having flexibility (flexibility), no air permeability, and low frictional resistance. Specifically, in this example, the film member 92 is formed from a PET (polyethylene terephthalate) film. Here, as the film member 92, in this example, a thin PET film having a thickness of about 188 μm is used.

The film member 92 is, as shown in FIG.
The rotary door 91 is formed in a rectangular shape as a whole having a width dimension M substantially equal to the axial dimension of the circumferential wall 91b of the rotary door 91. A film opening 92a is formed at an intermediate position in the length L direction of the film member 92 so as to always communicate with the door ventilation port 91d. In FIG. 2A, reference numeral 92a 'denotes a circumferential opening range of the film opening 92a.

In this embodiment, the film opening 92a is
Each film opening 92a is formed in a slender, substantially hexagonal shape, and the longitudinal direction of the hexagonal shape is oriented in the length L direction. In addition, the film opening 92a is
When the rotary door 2 is attached to the rotary door 91, the maximum length of the rotary door 91 in the rotation direction is substantially equal to the maximum width of the blowout air passage openings 5, 6 for the face and the foot.

Furthermore, the shape and area of all the film openings 92a are the same as those of the blowout air passage openings 5,
It is almost equivalent to 6. However, actually, since there is a partition located between the respective film openings 92a, the film openings 92a are slightly smaller. Thereby, as shown in FIGS.
In the case where 1 opens only the blow-off air passage opening 5 for the face (in the face mode), the opening edges of the blow-off air passage opening 5 for the face and the film opening 92a of the film member 92 coincide (wrap). Therefore, the ventilation resistance in the face mode can be minimized. Note that the same applies to the case where the foot outlet air passage opening 6 is fully opened.

On the other hand, a plurality of mounting holes 92b are formed at the right end of both ends (left and right edges in FIG. 5) of the film member 92. This mounting hole 9
Specifically, 2b is formed by a circular hole fitted into the pin member 91g. A plurality of slide holes 92c are formed at the left end. This slide hole 9
Reference numeral 2c denotes an elongated hole into which the pin member 91i of the slide wall 91h is movably fitted. Here, since the longitudinal direction of the slide hole 92c is oriented in the length L direction, when the film member 92 is attached to the rotary door 91 in an arc shape, the arc-shaped circle is formed. The longitudinal direction of the long hole faces in the circumferential direction. The longitudinal dimension of the elongated hole forming the slide hole 92c is set to a size that can sufficiently absorb the dimensional variation of the film member 92 and the case 1.

In mounting the film member 92 in an arc shape on the outer peripheral side of the circumferential wall 91b of the rotary door 91, first, as shown in FIG. A predetermined length including the mounting hole 92b is bent toward the inner diameter side to form a bent portion 92k. Then, in this state, the film member 92 is
And a circular mounting hole 92b at one end of the film member 92 is fitted to the pin member 91g. On the other hand, the elongated slide hole 92c on the other end side of the film member 92 is fitted to the pin member 91i of the slide wall portion 91h.

Thereafter, the head of the resin-made pin member 91g is heat-heated to enlarge the head of the pin member 91g into a rivet shape. Thus, the bent portion 92k on one end side of the film member 92 can be prevented from coming off, and the bent portion 92k can be fixed to one circumferential end of the circumferential wall 91b of the rotary door 91. Therefore, the bent portion 92k on one end side of the film member 92 is a fixed end.

Similarly, the head of the resin pin member 91i of the sliding wall portion 91h is heat-sealed and expanded in the form of a rivet to prevent the film member 92 from falling off at the other end in the circumferential direction. Do. At this time, the heat caulking portion of the head of the pin member 91i has a small amount of deformation in the pin axis direction, thereby providing a gap between the film member 92 and the outer peripheral surface of the sliding wall portion 91h (FIGS. 2, 3). Reference). As a result, the other end in the circumferential direction of the film member 92 is not fixed to the outer peripheral surface of the slide wall portion 91h of the rotary door 91, and extends in the circumferential direction within the longitudinal dimension of the slide hole 92c. Can move freely. Therefore, the other end in the circumferential direction of the film member 92 is a movable free end 92d.

As described above, by making the other end of the film member 92 in the circumferential direction a movable free end 92d,
In order to prevent the film member 92 from being excessively bent by wind pressure and vibration, it is necessary to select a material having relatively high rigidity as the film member 92. The length L (circumferential length) of the film member 92 is, as understood from FIG.
An arc surface on which 6 and 7 are formed (an arc surface having a radius of curvature larger by a predetermined amount than the circumferential wall 91b of the rotary door 91)
And the virtual circumferential length determined in the range where the extension of the plane opening 91j of the rotary door 91 intersects,
The length is set to be slightly longer than the sum of the bent portion for attaching one end and the portion forming the elongated slide hole 92c at the other end.

Thus, the film member 92 is formed into an arc shape along the arc surface on which the blow-out air passage openings 5, 6, 7 on the case 1 side are formed by its own rigidity and the wind pressure received from the inner peripheral side. Will be retained. Here, the film member 9
As for 2, instead of bending the flat plate-shaped member shown in FIG. 5 into an arc shape, a member previously formed into an arc shape can be used. This arc-shaped film member 9
2 improves the sealing function for closing the blow-off air passage openings 5, 6, 7.

The opening 92a of the film member 92
FIG. 1 shows three ventilation holes 91 d of the rotary door 91.
In addition, in FIG. 3, the film wraps around the door vent 91d which is located second in the clockwise direction from the left end in the circumferential direction, and the inner and outer peripheral portions of the rotary door are opened at the film opening 92a. . In the rotary door 91 configured as described above, the rotation shaft 91c of the both end plate portions 91a is aligned with the center of curvature of the arc-shaped inner wall surface on which the blowing air passage openings 5, 6, and 7 on the case 1 side are aligned. In this case, a lever 21 is fixed to one of the rotating shafts 91a as shown in FIG.
Are connected at one end. This control cable 2
The other end of 2 is connected to a blowing mode switching lever (blowing mode switching operating means) provided on an air conditioning control panel (not shown) in the vehicle compartment. Thereby, the rotary door 9
Reference numeral 1 is adapted to be rotationally displaced in the rotational direction (the direction of arrows D and E in FIG. 1) based on a manual operation of the blowout mode switching lever.

Next, the operation of the above configuration will be described.
When the blower 2 is operated, the inside of the case 1 is indicated by arrows A,
Air flows as indicated by B and C, and the blown air reaches the inner peripheral side of the rotary door 91 from the flat opening 91j of the rotary door 91, where the cool air and the hot air are mixed. Then
The blown air passes through the ventilation opening 91d of the rotary door 91 and the opening 92a of the film member 92, and any one of the blowout air passage openings 5, 6, 7 on the case 1 wrapped with the film opening 92a or From multiple outlets to each outlet, blows out into the passenger compartment.

At this time, the film member 92 is extended so as to expand toward the outer peripheral side by the wind pressure, and comes into pressure contact with the distal end portion 8 of the partition wall of the blow-off air passage openings 5, 6, 7 to be closed. 8 can be sealed.
Therefore, the opening to be closed can be reliably closed without air leakage. Further, since the circumferential wall 91b of the rotary door 91 has an arc range of approximately 180 degrees, the opening area of the planar opening 91j, which is the air intake of the door, is maximized, which contributes to reducing the ventilation resistance. .

In this embodiment, when the user manually operates the air outlet mode switching lever in the vehicle, the operating force is directly transmitted to the rotary door 91 via the control cable 22 and the lever 21 and the rotary door 9 is operated.
1 rotates in the direction of arrow D or E. At this time, specifically, the rotary door 91 is rotationally displaced to each of the predetermined positions shown in FIGS. 3 and 6 to 9, and one of the five blowing modes is selected.

Further, the blow mode switching lever in the present embodiment is movable in the width direction of the vehicle, and by moving the same amount in order from the left side to the right side of the vehicle,
As the predetermined blowing mode, a face mode, a bi-level mode, a foot mode, a foot differential mode, and a defroster mode can be selected in this order. That is, the rotary door 9 is proportional to the operation amount of the blow mode switching lever.
1 will rotate.

Next, the above-described blowing mode will be described. First, in the case of the FACE mode, FIG.
It will be described based on. When the blow mode switching lever is located at the leftmost position in the width direction of the vehicle and the face mode is selected, the rotary door 91 is rotated together with the film member 92 to the position shown in FIG. The opening 92a of 92 completely wraps around the blow-off air passage opening 5 for the face. And in this state,
The portion of the film member 92 where the opening 92a is not provided is protruded to the outer peripheral side by wind pressure, so that the foot blowing air passage opening 6 and the defroster blowing air passage opening 7 have the partition wall tip 8 at the end. The two openings 6 and 7 are securely closed by pressure contact.

Thus, the air in the case 1 is taken into the door from the flat opening 91j of the rotary door 91, and is sent from the blow-out air passage opening 5 for the face through the door ventilation opening 91d and the film opening 92a. It flows into the face duct 10 and is blown out from the face outlet into the vehicle interior. Next, the bi-level (B / L) mode will be described with reference to FIG. In the bi-level mode, the rotary door 91 is rotated counterclockwise by a predetermined angle from the state of the face mode in FIG. 3 so that the opening 92a of the film member 92 closes the face air outlet 5a. Of the foot air outlet opening 6 for the foot.

At this time, the blowout air passage opening 7 for the defroster is formed by the opening 92 of the film member 92.
It is surely closed by the portion where a is not provided. As a result, the air in the case 1 is taken into the inside of the door from the flat opening 91j of the rotary door 91, and the blow-out air passage opening 5 for the face and the foot air opening 5d through the door ventilation opening 91d and the film opening 92a. The air flows into the blow-off air passage opening 6 and is simultaneously blown into the vehicle compartment from both the face outlet and the foot outlet.

Next, a foot (FOOT) will be described with reference to FIG.
The mode will be described. In this case, the rotary door 9
1 further rotates by a predetermined angle in the counterclockwise direction from the state of the bi-level mode of FIG. 6, so that the film opening 92a completely wraps around the foot air outlet opening 6 and the face opening 92a. Is completely closed. On the other hand, in the present embodiment, the blowout air passage opening 7 for the defroster does not completely close, but as shown in FIG. A predetermined amount of gap is opened to allow a slight amount of air in the case 1 to leak from the blower air passage opening 7 for the defroster so that the effect of preventing fogging of the window glass can be exhibited.

Next, referring to FIG. 8, a foot differential (F /
D) Mode will be described. In this case, the rotary door 91 is further rotated by a predetermined angle in the counterclockwise direction from the state of the foot mode of FIG. 7 so that the film opening 92a is substantially wrapped around the foot air outlet opening 6 by half. At the same time, the end of the rotary door 91 on the pin member 91g side is connected to the blowing air passage opening 7 for the defroster.
About half of the opening.

At this time, the blow-off air passage opening 5 for the face is fully closed by the portion of the film member 92 where the opening 92a is not provided. As a result, the blast air
The airflow flowing directly into the blower air passage opening 7 for the defroster bypassing the rotary door 91 and the door vent 9
1d, the air flow flowing into the foot air outlet opening 6 through the film opening 92a and the film opening 9
2a, after flowing into the inside of the door through the door vent 91d, the air flow again flows into the foot outlet air passage opening 6 through the door vent 91d and the film opening 92a.

Finally, based on FIG. 9, the defroster (DE
The F) mode will be described. In the defroster mode, the rotor door 91 is further rotated by a predetermined angle in the counterclockwise direction from the state of the foot differential mode in FIG. Thus, the end of the rotary door 91 on the pin member 91g side fully opens the blowout air passage opening 7 for the defroster. At the same time, the blowout air passage openings 5 and 6 for the face and the foot are
Are completely closed by a portion where the opening 92a is not provided.

As a result, the blast air in the case 1 flows only into the blow-off air passage opening 7 for the defroster, blows out from the defroster outlet through the defroster duct 12 toward the inner surface of the window glass, and prevents fogging of the window glass. I do. As is clear from the description of the blowing mode switching operation in FIGS. 3 and 6 to 9 described above, the free end 92d of the film member 92 is
The (end on the side of the slide hole 92c) is always set to the end on the side located outside the opening range of the plurality of outlet air passage openings 5, 6, 7 in the rotation area of the rotary door 91. Therefore, even if the sliding wall portion 91 h of the rotary door 91 and the resin pin member 91 i are arranged on the free end 92 d side of the film member 92, these members 91 h and 91 i are formed by the blowout air passage openings 5 and 6 of the case 1. , 7 does not hinder the rotation of the rotary door 91 at all.

Further, since one end of the film member 92 in the circumferential direction is a free end 92d which is movable on the sliding wall portion 91h of the rotary door 91, the film member 92 is free.
Alternatively, even if dimensional variations occur in the blow-out air passage openings 5, 6, and 7 of the case 1, the free end 92d of the film member 92 may slide on the slide wall 91h in a direction to offset the dimensional variations. it can.

Therefore, for example, if the circumferential length of the film member 92 is shorter than the design dimension, the film member 9
2 free end 92d is located on the upper side of FIG.
By sliding inward (inward in the circumferential direction), the film member 92 can reliably press against the inner wall surface of the case 1 by receiving the wind pressure, thereby avoiding poor sealing. When the circumferential length of the film member 92 is longer than the design dimension, the free end 92d of the film member 92 slides downward (outward in the circumferential direction of the rotary door 91) in FIG. In addition, it is possible to prevent wrinkles from being formed in the film member 92, and thus it is possible to prevent the wrinkles from causing problems such as generation of noise and poor sealing.

Incidentally, the film member 92 as described above is used.
In the switching device for switching the plurality of air passage openings 5, 6, and 7 by the rotary door 91 in combination with the above, the film member 92 is a flexible thin-film resin member, and the film member 92 is a case. Since the slide member slides while being pressed against the front end portion 8 of the first partition wall 8, the door operating force may be greatly increased due to a change in the shape of the film member 92.

The inventors of the present invention have studied and investigated various factors for increasing the door operating force. As a result, the bending of the bent portion 92k bent at one end of the film member 92 in the circumferential direction (length L direction) was performed. It has been found that the door operating force is greatly affected by the radius R. Then, next, this bent part 92
10 and 11 are enlarged views of a main part showing a state immediately before shifting to the above-described defroster mode (FIG. 9). FIG. FIG. 11 shows a case where the bending radius R of the bent portion 92k is large, and FIG. 11 shows a case where the bending radius R of the bent portion 92k is large.

As shown in FIG. 10, the bending radius R of the bent portion 92k is calculated.
Is smaller, the door vent 91d of the rotary door 91 is
When the air flows toward the inner peripheral surface of the film member 92 through the through hole, if the bending radius R of the bent portion 92k is small, the area of the plane portion of the inner peripheral surface of the film member 92 increases,
The air flow is guided by this plane portion and concentrates on the corner portion 92e having a small bending radius R as shown by an arrow F. Therefore, a large load acts on the corner 92e, and as a result,
A corner portion 92 having a small bending radius R in the film member 92;
The portion e is greatly deformed to the outer peripheral side as shown by the broken line G.

However, since FIG. 10 shows a state immediately before the defroster mode position shown in FIG. 9, to reach the defroster mode position, the rotary door 91 is further rotated leftward in FIG. 10 from the state shown in FIG. At this time, the corner portion 92e greatly deformed (protruding) to the outer peripheral side as shown by the broken line G rides on the partition wall front end portion 8 on the case 1 side, so that the rotary operation of the rotary door 91 is performed. This leads to a sudden increase in power.

On the other hand, in the present embodiment, the bending radius R of the bending portion 92k is increased as shown in FIG.
A gentle arc corner 92f is formed over a wide range. Therefore, the area of the plane portion of the inner peripheral surface of the film member 92 becomes narrower than in the case of FIG. 10, and the load of the wind pressure is distributed over the entire area of the gentle arc corner 92f. As a result, the amount of deformation of the corner portion 92f to the outer peripheral side becomes very small as indicated by the broken line H, so that the rotary door 91 further rotates leftward in FIG. 11 from the state of FIG. When reaching the mode position, the relatively small-sized deformed portion of the corner portion 92f merely rides on the partition wall front end 8 on the case 1 side. Therefore, an increase in the rotational operation force of the rotary door 91 can be suppressed to a small value.

FIG. 12 shows the experimental results of the present inventor. The bending radius R of the bent portion 92k and the rotary door 9 are shown.
1 shows the relationship with the rotation operation force (N) of FIG.
Indicates a turning operation force (unit: N) when the blower 2 is stopped (blowing amount = 0), and indicates a blowing amount = 390 m ³ /
h shows the rotational operation force. As can be understood from FIG. 12, when the blowing amount = 0, the turning operation force hardly changes due to the bending radius R, but the blowing amount = 390.
At m ³ / h, it can be seen that the turning operation force can be reduced as the bending radius R of the bent portion 92k increases. From the experimental results of FIG. 12, the present invention shows that the bent portion 92k
Has a bending radius R of 6 mm or more.

However, if the bending radius R of the bent portion 92k is too large, when the rotary door 91 reaches the defroster mode position in FIG. 9, the arc portion of the corner portion 92f faces the leading end portion 8 of the partition wall. As a result, a gap is generated between the leading end portion 8 of the partition wall and the film member 92, and air leakage (defective sealing) to the face blow air passage opening 5 occurs. According to experimental studies by the inventor, in order to avoid this sealing failure, the bending radius R of the bent portion 92k is set to 8
It was found that it was necessary to set the thickness to less than mm.

As described above, in the present invention, the bending radius R of the bent portion 92k is set in the range of 6 to 8 mm. (Other Embodiments) In the above-described embodiment, one end (bent portion 92k) in the circumferential direction of the film member 92 is an immovable fixed end and the other end is a free end 92d. As in the conventional apparatus described in Japanese Patent Application Laid-Open No. 8-25945, bending portions 92k are provided at both ends in the circumferential direction of the film member 92.
May be formed and fixed to the rotary door 91. In this case, the bending radius R of the bent portions 92k at both ends may be set in the above range.

In the above-described embodiment, the film member 92 is disposed with a gap between the outer peripheral surface of the peripheral wall 91b of the rotary door 91 and the beam 91e of the peripheral wall 91b of the rotary door 91. Between the member 92,
As described in Japanese Patent Application Laid-Open No. H8-25945, an elongated elastic member such as urethane foam extending in the axial direction is provided to improve the sealing performance of the film member 92 by maintaining a good arc shape of the film member 92. And noise reduction.

In the above embodiment, the film opening 92a is constituted by a plurality of openings. However, the film opening 92a is not limited to a plurality and may be a single opening. Also, the drive structure of the rotary door 91 is not limited to a structure in which the control cable 22 is directly driven by a manually operated blowout mode switching lever. For example, an electric switch and a motor driven based on the switch operation may be used. May be configured to rotate the rotary door 91 with the driving source.

In addition, the present invention is not limited to the vehicle air conditioner described in the above embodiment, but can be widely applied to various devices for opening and closing the air passage.

[Brief description of the drawings]

FIG. 1 shows one embodiment of the present invention, and is a schematic cross-sectional view of a main part of a vehicle air conditioner.

2A is a side view of a rotary door portion shown in FIG. 1, and FIG. 2B is a front view of a main part of FIG.

FIG. 3 is an enlarged sectional view of a main part of FIG.

FIG. 4 is an exploded perspective view of a rotary door portion.

FIG. 5 is a developed plan view of a film member.

FIG. 6 is a cross-sectional view showing an operation state of the air passage switching device in a bi-level mode.

FIG. 7 is a sectional view showing an operation state of the air passage switching device in a foot mode.

FIG. 8 is a sectional view showing an operation state of the air passage switching device in a foot differential mode.

FIG. 9 is a sectional view showing an operation state of the air passage switching device in a defroster mode.

FIG. 10 is an enlarged sectional view of a main part of a rotary door portion of a comparative example of the present invention.

FIG. 11 is an enlarged sectional view of a main part of a rotary door according to an embodiment of the present invention.

FIG. 12 is a graph showing experimental results.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Case, 2 ... Blower, 5, 6, 7 ... Blowing air passage opening part, 9 ... Air passage switching device, 91 ... Rotary door, 9
1b: circumferential wall, 91d: door vent, 91g, 91j ...
Pin member, 92: film member, 92a: film opening, 92k: bent portion.

Claims (2)

[Claims] 1. A case (1) forming an air passage, and a rotary door (91) rotatably disposed in the case (1) and having an arc-shaped circumferential wall (91b).
A door vent (91d) opened in a circumferential wall (91b) of the rotary door (91); and in the case (1), the rotary door (9).
An air passage opening (5, 6, 7) opened in a region where the circumferential wall (91b) of (1) rotates; and an outer peripheral side of the circumferential wall (91b) of the rotary door (91), A flexible film member (92) that rotates together with the rotary door (91), and the film vent (91)
d) and a film opening (92a) opened so as to be always in communication with the film opening (92). By rotating the rotary door (91), the film opening (92a) and the air passage opening (5, 6. An air passage switching device for selecting communication or shutoff with the film member (6, 7), wherein a bent portion (92k) is provided on at least one end side of both circumferential ends of the film member (92); The bent portion (92k) is fixed to the rotary door (91), and a bending radius R of the bent portion (92k) is set.
Is set in the range of 6 to 8 mm. 2. The air passage switching device (9) according to claim 1, wherein the air passage openings include a face air opening (5) and a foot air passage opening (6). And a blower air passage opening (7) for a defroster. These blower air passage openings (5, 6, 7) are opened and closed by the film member (92) and the rotary door (91). Characteristic vehicle air conditioner.