JPH10181332A - Door device for air passage and air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heighten a passage partitioning effect of a door on the stop position setting side by providing a stepped part where only one of both doors is brought into contact and the other door is not brought into contact in a region in which turning areas of two doors lap each other in a wall surface of an air passage, and and forming a seal surface of the stop position of one door. SOLUTION: The turning areas of both air mix doors 17, 18 partly lap each other like circular arc ranges 17b, 18b, and in the inner wall surface of an air conditioning case 11, a region where the turning areas 17b, 18b lap each other is provided with a stepped part where only an auxiliary air mix door of both air mix doors is brought into contact and the main air mix door 17 is not brought into contact. This stepped part 11b is formed on two opposite case wall surfaces, so that both end parts in the direction of a rotation axis 18a of the auxiliary air mix door 18 are brought into contact with the stepped part 11b. In the auxiliary air mix door 18 part, at the stop position during maximum heating, it is brought into contact with the stepped part 11b to form a seal surface, thereby improving partitioning operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to two flat doors for controlling the air flow in an air passage, which are rotatably provided adjacent to each other, and a part of the rotation area of the two doors is wrapped with each other. The present invention relates to a door device for an air passage and a vehicle air conditioner using the same. In particular, according to the present invention, the passage of the conditioned air is divided into a first air passage on the inside air side and a second air passage on the outside air side, and the heated high-temperature inside air is recirculated and blown out from the foot outlet. By blowing out low-humidity outside air from the defroster outlet, it is suitable for use in a vehicle air conditioner that achieves both improvement in heating capacity and anti-fog properties of window glass.

[0002]

2. Description of the Related Art As a prior art of such a vehicle air conditioner, there is one disclosed in Japanese Patent Application Laid-Open No. 5-124426. To explain the outline of this prior art, an air conditioning case of a vehicle air conditioner has an inside air intake port and an outside air intake port formed at one end side, and a foot outlet, a defroster outlet, and a face outlet at the other end side. Each is formed.

In the air conditioning case, a first air passage extending from the inside air inlet to the face outlet and the foot outlet, and a second air passage extending from the outside air inlet to the defroster outlet are defined. A partition plate to be formed is provided. Further, a heating heat exchanger, a bypass passage that bypasses the heating heat exchanger, and an air mixing door are provided in the air passages. In the air mix door, a door on the first air passage side and a door on the second air passage side are integrally provided on one rotating shaft rotatably provided over both the air passages. It has a configuration.

When one of the face mode, the bi-level mode, and the foot mode is selected as the blowing mode, if the inside / outside air mode at that time is the inside air circulating mode, the inside air is introduced into the two air passages. Introduce,
In the outside air introduction mode, outside air is introduced into both air passages. When the defroster mode is selected as the blowing mode, outside air is introduced into both air passages.

Further, when the foot defroster mode is selected as the blowing mode, a two-layer flow mode is adopted in which inside air is introduced into the first air passage and outside air is introduced into the second air passage. By doing so, already warmed inside air can be blown out from the foot outlet to heat the vehicle interior, so that the heating performance can be improved. At the same time, low-humidity outside air is blown out to the window glass from the defroster outlet,
The anti-fog performance of the window glass can be secured.

[0006]

In recent years, in a vehicle air conditioner, it has been a major problem to reduce the size and simplification of the configuration of an air conditioning unit mounted in a vehicle cabin due to space restrictions and cost restrictions in mounting the vehicle. Has become. However, in the above-described conventional technology, the first air conditioning unit has the first
It is necessary to additionally install a partition plate that separates the air passage and the second air passage, which leads to a complicated configuration, raises costs, and has a physique to avoid interference between the partition plate and doors. It becomes large.

Therefore, the inventors of the present invention pay attention to the fact that the two-layer inside / outside air mode is set at the time of maximum heating (including the time of high heating capacity near the maximum heating), and the air flow ratio of the cool / hot air is set. We are trying to develop a vehicle air-conditioning system that reduces the size and simplification of the air-conditioning unit by configuring the air-mixing door itself that controls the temperature by adjusting the temperature as a movable partition member for the air passage (Japanese Patent Application Hei 8-287016).

In this vehicle air conditioner, two doors, a main air mix door and an auxiliary air mix door, are used as the air mix door, and the auxiliary air mix door is used as an air mix door.
The first air passage on the inside air side and the second air passage on the outside air side are formed as movable partition members. In this case, in order to reduce the size of the air-conditioning unit, it is effective to wrap a part of the rotation area of the two air mix doors with each other. By the way, in the configuration in which a part of the rotation area of the two air mix doors is wrapped with each other, as shown in FIG.
The main air mix door 17 is brought into contact with a sealing surface 11a protruding from the inner wall surface of the air conditioning case 11 to form a movable partition member even if the sealing effect at the stop position of the main air mix door 17 can be ensured. In the auxiliary air mix door 18, a sealing surface cannot be formed at the stop position.

This is because, when the sealing surface is formed so as to protrude at the stop position of the auxiliary air mixing door 18 at the time of maximum heating, the sealing surface is located within the rotation area of the main air mixing door 17, so that the sealing surface is This is because the main air mix door 17 cannot be rotated in a required range because it interferes with the air mix door 17. Since a sealing surface cannot be formed at the stop position of the auxiliary air mix door 18 at the time of maximum heating, a gap is generated between the tip of the auxiliary air mix door 18 and the inner wall surface of the air conditioning case 11. As a result, it has been found that a problem occurs in which the inside air of the first air passage 8 is mixed into the outside air of the second air passage 9 as shown by an arrow E. This second
Mixing of the inside air into the air passage 9 deteriorates the anti-fog property of the window glass.

In view of the above, the present invention provides two flat doors for controlling air flow in an air passage adjacent to each other so as to be rotatable, and a part of a rotation area of the two doors. The purpose of the present invention is to enhance the effect of partitioning the door on the side that sets the stop position in the lap range of the door rotation area in the door device for an air passage in which the doors are wrapped with each other.

[0011]

In order to achieve the above object, according to the present invention, air passages (8, 9) are provided.
One of the two doors (17, 18) is overlapped with a portion of the wall surface of the
8) is provided with a step (11b) that does not contact the other door (17), and the step (11b) forms a sealing surface at the stop position of one door (18). Features.

Thus, one door (1) does not interfere with the other door (17) and the step (11b).
Since a sufficient sealing effect can be exhibited by contacting the step (8) with the step (11b), the door partitioning effect by the door (18) can be favorably exhibited. Therefore, according to the third and fourth aspects of the present invention, the first air passage (8) through which the inside air flows and the second air passage (9) through which the outside air flows through the air passages (8, 9) by the one door (18). ), The separation between the inside air and the outside air is enhanced, and both the anti-fogging property of the window glass and the improvement of the heating effect can be satisfactorily achieved.

In particular, in the invention according to claim 4, since the auxiliary air mixing door itself can also serve as a movable partition member for the inside and outside air, the installation area of the fixed partition member can be reduced, and two Air mix door (1)
7 and 18) can share the rotation space, so that the size and configuration of the air conditioning unit can be reduced.

[0014]

1 and 2 show a first embodiment of the present invention. This embodiment is used for heating such as a vehicle equipped with a diesel engine, an electric vehicle, a hybrid vehicle and the like. The present invention is applied to an air conditioner in a vehicle in which it is difficult to secure a sufficient heat source. FIG. 1 is a schematic diagram showing the entire configuration of an air-conditioner ventilation system in the present embodiment, and FIG. 2 is a longitudinal sectional view of an air-conditioning unit therein.

In FIG. 1, the ventilation system of the air conditioner is roughly divided into two parts, a blower unit 1 and an air conditioning unit 100. First, the blower unit 1 will be described. The blower unit 1 is disposed in the lower part of the instrument panel in the vehicle cabin so as to be offset from the center toward the passenger seat side. First and second inside air introduction ports 2 and 2a for introducing vehicle interior air) and an outside air introduction port 3 for introducing outside air (vehicle outside air) are provided. These inlets 2, 2a, 3 are respectively the first and second
Can be opened and closed by the inside and outside air switching doors 4 and 5.

The inside / outside air switching doors 4 and 5 are respectively operated to rotate about the rotation shafts 4a and 5a, respectively. Operated in conjunction with the air introduction mode control signal. Then, a first (inside air side) fan 6 and a second (outside air side) fan 7 for blowing the air introduced from the inlets 2, 2 a, and 3 are arranged in the blower unit 1. The fans 6 and 7 are composed of a well-known centrifugal multi-blade fan (sirocco fan), and are simultaneously driven to rotate by one common electric motor (not shown).

FIG. 1 shows a state of a two-layer flow mode which will be described later. The first inside / outside air switching door 4 opens the first inside air introduction port 2 and closes the outside air passage 3a from the outside air introduction port 3. Therefore, the inside air is sucked into the suction port 6a of the first (inside air) fan 6, while the second inside / outside air switching door 5 closes the second inside air inlet 2a to open the outside air passage 3b from the outside air inlet 3. , The outside air is sucked into the suction port 7a of the second (outside air side) fan 7.

Therefore, in this state, the first fan 6
The inside air from the inside air inlet 2 is blown to the first (inside air side) passage 8, and the second fan 7 sends the outside air from the outside air inlet 3 to the second
(Outside air side) It is designed to blow air to the passage 9,
The second passages 8 and 9 are partitioned by a partition plate 10 arranged between the first fan 6 and the second fan 7. The partition plate 10 can be integrally formed with a resin scroll casing 10a that houses the fans 6 and 7.

Further, in the present embodiment, in the two-layer flow mode, the inside air volume blown by the first fan 6 in the two-layer flow mode in order to achieve both improvement of the heating capacity and securing of the anti-fog property of the window glass. It is set so that the amount of outside air blown by the second fan 7 is larger than that. That is, in the two-layer flow mode, the ventilation resistance (pressure loss) on the first passage 8 side and the second
In consideration of the ventilation resistance (pressure loss) on the passage 9 side, the blowing capacity of the first fan 6 is set such that the amount of outside air blown by the second fan 7 is larger than the amount of inside air blown by the first fan 6. In addition, the blowing capacity of the second fan 7 is set.

Specifically, the second passage 9 side is made larger than the passage sectional area of the first passage 8 side, and the ventilation resistance (pressure loss) of the second passage 9 side is made smaller than that of the first passage 8 side. Or the air blowing capacity of the second fan 7 is made larger than that of the first fan 6 in a state of a single fan, or both the ventilation resistance and the air blowing capacity are combined so that the air volume is smaller than the internal air volume in the two-layer flow mode. Increase the ratio of outside air volume.

According to the experimental study of the present inventors, the ratio of the inside air amount to the outside air amount in the two-layer flow mode is specifically,
A ratio of about 4.5 to 5.5 is preferable for achieving both the above-mentioned heating capacity and anti-fog property of window glass. Next, the air-conditioning unit 100 includes an evaporator (cooling heat exchanger) 1 in one air-conditioning case 11.
2 and a heater core (heating heat exchanger) 13 are both integrated. Hereinafter, a specific structure of the air conditioning unit 100 will be described in detail with reference to FIG.

The air-conditioning case 11 is made of a molded article of a resin having a certain degree of elasticity and excellent strength, such as polypropylene, and is divided into right and left parts having a dividing surface in the vertical direction (vehicle vertical direction) in FIG. It consists of the case. The left and right two-part case accommodates the heat exchangers 12 and 13 and devices such as doors to be described later, and is then integrally connected by fastening means such as metal spring clips and screws to form the air conditioning case 11.

The air-conditioning unit 100 is disposed substantially at the center in the vehicle left-right direction in the lower part of the instrument panel in the vehicle interior. An air inlet 14 is provided, and the conditioned air blown from the blower unit 1 flows into the air inlet 14. The air inlet 14 is open on the side of the air-conditioning case 11 on the passenger seat side to connect to the air outlet of the blower unit 1 disposed at the front part of the passenger seat.

In the air conditioning case 11, the air inlet 1
The evaporator 12 is provided with the first and second air passages 8 and 7 just after
It is arranged so as to cross the whole area. This evaporator 12
As is well known, the latent heat of evaporation of the refrigerant in the refrigeration cycle is absorbed from the conditioned air to cool the conditioned air. Here, as shown in FIG. 2, the evaporator 12 is installed in the air-conditioning case 11 so as to be thin in the vehicle front-rear direction and oriented in the vehicle vertical direction in the longitudinal direction.

The air passage from the air inlet 14 to the evaporator 12 is divided by a partition plate 15 into a first air passage 8 on the lower side of the vehicle and a second air passage 9 on the upper side of the vehicle. The partition plate 15 is a fixed partition member formed integrally with the air-conditioning case 11 with resin and extending in the horizontal direction.
The downstream side of the air flow of the evaporator 12 (the rear side of the vehicle)
The heater cores 13 are adjacently arranged at a predetermined interval. The heater core 13 reheats the cold air that has passed through the evaporator 12, in which high-temperature engine cooling water (hot water) flows, and heats the air using the cooling water as a heat source. Like the evaporator 12, the heater core 13 is thin in the vehicle front-rear direction and installed in the air-conditioning case 11 so as to be oriented in the vehicle vertical direction in the longitudinal direction. However, the heater core 13 is arranged to be inclined toward the vehicle front side by a slight angle from the vertical.

In the air conditioning case 11, the heater core 1
A cool air bypass passage 16 through which air (cool air) flows bypassing the heater core 13 is formed in an upper portion of the heater 3. In the air-conditioning case 11, between the heater core 13 and the evaporator 12, the ratio of the amount of hot air heated by the heater core 13 and the amount of cool air bypassing the heater core 13 (that is, the cool air flowing through the cool air bypass passage 16) is adjusted. A flat main mix door 17 and an auxiliary air mix door 18 are arranged adjacent to each other. Here, the air mixing doors 17 and 18 are integrally connected to rotating shafts 17a and 18a arranged in the horizontal direction, respectively, and are rotatable in the vehicle vertical direction together with the rotating shafts 17a and 18a. I have.

The rotating shafts 17a and 18a are
, And one end of each of the rotating shafts 17a, 18a protrudes outside the air conditioning case 11, and is connected to a link mechanism (not shown). Both air mix doors 17,
Reference numeral 18 is operated in conjunction with the air temperature control signal of the air conditioner via the link mechanism and an actuator such as a servomotor.

The rotating shaft 17a of the main air mixing door 17 is arranged above the rotating shaft 18a of the auxiliary air mixing door 18 at a predetermined interval, and the main and auxiliary air mixing doors 17, 18 interfere with each other. It is operable to an arbitrary rotation position so as not to be performed. At the time of maximum cooling, both the air mix doors 17 and 18 are rotated to the positions where they wrap each other as shown by the two-dot chain line in FIG. By doing so, the air inflow path to the heater core 13 is completely closed.

On the other hand, at the time of maximum heating, both the air mixing doors 17 and 18 are rotated to the solid line positions in FIG.
At the same time that the end of the auxiliary air mix door 18 is completely closed and the tip of the auxiliary air mix door 18 is located immediately after the evaporator 12 and in the vicinity of the extension line A of the partition plate 15, the auxiliary air mix door 18 The air passage between the heater core 13 and the first air passage 8 and the second air passage 9 serve as a movable partitioning member.

In particular, in this embodiment, the auxiliary air mix door 1
8 is set so as to shift a predetermined amount toward the second air passage 9 side from the extension line A of the partition plate 15. Here, as shown in the arc ranges 17b and 18b of FIGS. 1 and 2, a part of the rotation area of the air mixing doors 17 and 18 is wrapped with each other, thereby sharing the rotation area. Therefore, the installation space for both air mix doors 17 and 18 is reduced.

As described above, the two air mix doors 17, 1
In the layout in which a part of the rotation regions 17b and 18b of the 8 are wrapped with each other, the following measures are taken in order to improve the passage partitioning action by the auxiliary air mix door 18. That is, among the inner wall surfaces of the air-conditioning case 11 (the wall surfaces of the air passages 8 and 9), the rotation areas 17b and 18 are provided.
A step 11b is provided at the portion where the air mixture b overlaps, in which only the auxiliary air mix door 18 of the two air mix doors abuts and the main air mix door 17 does not abut.

As shown in FIG. 10A, the step 11b is formed integrally with the air-conditioning case 11 made of resin. The step 11b is formed by enlarging the rotation area 17b of the door 17 from the wall surface to the outside of the case. Since the step 11b is formed on two opposing case walls in the direction perpendicular to the paper surface of FIG. 2 (the left-right direction of the vehicle), both ends of the auxiliary air mix door 18 in the direction of the rotating shaft 18a correspond to the step 11b. They are in contact.

The step 11b is formed so as to be in contact with the auxiliary air mix door 18 over the entire length from the end of the auxiliary air mix door 18 on the rotating shaft 18a side to the end on the side opposite to the rotating shaft 18a. ing. The step 11b forms a sealing surface at the stop position of the auxiliary air mix door 18 at the time of maximum heating.

In FIG. 10A, the sealing surface 11a with which the main air mixing door 17 contacts at the time of the maximum heating is formed so as to protrude from the inner wall surface of the air-conditioning case 11 at the periphery of the inlet hole 16a of the cool air bypass passage 16. . The sealing effect at the stop position of the main air mix door 17 at the time of maximum heating is ensured by the sealing surface 11a. The evaporator 12 is of a well-known lamination type, in which a number of flat tubes formed by laminating two thin metal plates made of aluminum or the like are laminated and arranged via corrugated fins, and are integrally brazed. The inside of the evaporator 12 can partition the air passage on the extension line A by the fin surface of the corrugated fin or the flat surface of the flat tube, whereby the first air passage 8 and the second air passage 9 can also be formed inside the evaporator 12. Can be sectioned.

In the air-conditioning case 11, a partition wall 19 extending in the vertical direction at a predetermined interval from the heater core 13 is provided downstream of the heater core 13 (a portion on the vehicle rear side). The partition wall 19 forms a first hot air passage 19a that is upward from immediately after the heater core 13. The downstream side (upper side) of the first hot air passage 19a merges with the cold air bypass passage 16 at an upper portion of the heater core 13, and
A cold / hot air mixing space 20 for mixing cold and hot air is formed.

A hot air bypass inlet 21 is opened at the lower end of the partition wall 19 so as to face the downstream surface of the heater core 13. It is opened and closed by the wind bypass door 22.
The hot air bypass door 22 is connected to a rotating shaft 23 rotatably disposed at an upper end of the hot air bypass inlet 21,
The rotary shaft 23 is rotated integrally between the solid line position and the two-dot chain line position in FIG.

In this embodiment, the hot-air bypass door 22 is operated through an actuator such as a link mechanism and a servomotor in accordance with the blow-out air temperature control signal and the blow-out mode control signal of the air conditioner. . When the maximum heating state is set (two-layer flow mode) in a foot blow mode and a foot defroster blow mode, which will be described later, the hot air bypass door 22 is positioned in the solid line position (near the partition line B of the heater core 13) in FIG. Position) to act as a movable partitioning member for partitioning the first warm air passage 19a immediately after the heater core 13 into the first air passage 8 and the second air passage 9. The stop position of the hot air bypass door 22 in the two-layer flow mode is set such that the tip of the door 22 is shifted by a predetermined amount from the partition line B toward the second air passage 9 similarly to the auxiliary air mix door 18. It is.

The heater core 13 is of a well-known type, and a large number of flat tubes formed by joining thin metal plates of aluminum or the like to have a flat cross section by welding or the like are laminated and arranged with corrugated fins interposed therebetween, and are integrally brazed. Things. The inside of the heater core 13 can partition the air passage on the partition line B by the fin surface of the corrugated fin or the flat surface of the flat tube.
The first air passage 8 and the second air passage 9 can also be formed in the interior 3.

On the upstream side of the heater core 13 in the air,
The partition line B and the rotation axis 1 of the auxiliary air mix door 18
8a is fixed to the air-conditioning case 11
It is integrally molded with. On the upper surface of the air conditioning case 11, a defroster opening 25 is opened at a portion on the vehicle front side. The defroster opening 25 receives temperature-controlled conditioned air from the cold / hot air mixing space 20, and blows air toward the inner surface of the vehicle window glass through a defroster duct and a defroster outlet (not shown).
Inlet hole 2 provided in the passage leading to defroster opening 25
5a is opened and closed by a defroster door 26. The defroster door 26 is rotatable about a rotation shaft 27.

On the upper surface of the air-conditioning case 11, a face opening 28 is opened at a position on the vehicle rear side (closer to the occupant) than the defroster opening 25. The face opening 28 also receives temperature-controlled conditioned air from the cold / hot air mixing space 20 through the communication passage 36. The occupant's head is opened through a face duct (not shown) from a face outlet at the upper part of the instrument panel. Blow the wind towards the club.

In the air-conditioning case 11, a front seat foot opening 29 is formed on the upper side of the side surface on the vehicle rear side. The front-seat foot opening 29 allows the temperature-controlled conditioned air from the cold / hot air mixing space 20 to flow in through the communication passage 36, and at the time of maximum heating, the opening of the hot-air bypass inlet 21 allows the bypass inlet to be opened. The warm air from 21 flows in through the second warm air passage 30. Then, the front seat foot opening 29 blows warm air from the front seat foot outlet through the front seat foot duct (not shown) to the feet of the occupant on the front seat side.

The entrance hole 29a of the front seat foot opening 29.
And a face opening portion 28, a foot / face switching door 31 is installed rotatably about a rotation shaft 32,
The entrance hole 2 of the front seat foot opening 29 is formed by the door 31.
9a and the face opening 28 are switched open and closed. In the air-conditioning case 11, a rear seat foot opening 33 is opened at the lower portion of the side surface on the vehicle rear side (closer to the occupant) so as to face immediately after the hot-air bypass inlet 21. Hot air from the hot air bypass inlet 21 and the second hot air passage 30 flows into the rear seat foot opening 33, and this hot air is blown through the rear seat foot duct (not shown). Warm air is blown from the exit to the rear passengers' feet.

At the lower end of the hot air bypass inlet 21, a hot air guide plate 34 for guiding the hot air toward the second hot air passage 30 is provided. In the present embodiment, at the time of the two-layer flow mode in the foot blowing mode, the hot air bypass door 22 is operated at the solid line position on the downstream side of the air from the heater core 13 to partition the first and second air passages 8, 7.
When the defroster door 26 opens the communication passage 36, the first and second air passages 8 and 7 are connected through the communication passage 36.
Communicate with each other at a position near the front seat foot opening 29.

The defroster door 26 and the foot / face switching door 31 are door means for switching the blowing mode, are connected to a link mechanism (not shown), and control the blowing mode of the air conditioner by an actuator such as a servomotor. It is operated in conjunction with a signal.
Each of the doors 4, 5, 17, 18, 22, 22,
6, 31 have the same structure in a single state,
Each rotating shaft 4a, 5a, 17a, 18a, 23, 27, 3
2 has a resin or metal door substrate integrally joined thereto, and has a structure in which an elastic sealing material such as urethane foam is adhered to both front and back surfaces of the substrate.

In the present embodiment, the hot air bypass door 22 and the foot / face switching door 31 constitute foot side door means. Next, the operation of the present embodiment in the above configuration will be described. As is well known, a vehicle air conditioner is provided with operation signals from various operation members provided on an air conditioning operation panel and sensors from various sensors for air conditioning control. An electronic control unit (not shown) to which a signal is input is provided, and each door 4, 5, 1, 1
The positions of 7, 18, 22, 26, 31 are controlled.

FIG. 3 shows a state in which the maximum heating state is set and the two-layer flow mode is set in the foot blowing mode, and FIGS. 1 and 2 show the same state. In this state, in the blower unit 1, the first inside air introduction port 2 communicates with the suction port 6 a of the first (inside air side) fan 6, and the outside air introduction port 3 connects with the second (outside air side) fan 7. 7
communicate with a. Therefore, in this state, the first fan 6
Sends the inside air from the inside air inlet 2 to the first (inside air side) passage 8, and the second fan 7 sends outside air from the outside air inlet 3 to the second (outside air side) passage 9.

In the air-conditioning unit 100, both the air mixing doors 17 and 18 are rotated to the solid line positions shown in the drawing, so that the main air mixing door 17 fully closes the inlet hole 16a of the cool air bypass passage 16, and at the same time, The distal end of the auxiliary air mix door 18 is set at a position immediately after the evaporator 12 and shifted by a predetermined amount toward the second air passage 9 from the extension line A of the partition plate 15. As a result, the auxiliary air mix door 18 functions as a movable partition member that partitions the air passage between the evaporator 12 and the heater core 13 into the first air passage 8 and the second air passage 9.

The hot-air bypass door 22 is operated at a position indicated by a solid line in the figure to partition the first hot-air passage 19a immediately after the heater core 13 into a first air passage 8 and a second air passage 9. And opens the hot air bypass inlet 21. Also, the defroster door 26
Is operated at an intermediate position between the communication passage 36 and the entrance hole 25a of the defroster opening 25, and both the openings 25a and 36 are opened. The foot / face switching door 31 closes the face opening 28 and opens the front seat foot opening 29.

Therefore, by operating the fans 6 and 7, the inside air from the inside air inlet 2 and the outside air from the outside air inlet 3 are separated by the partition members 10, 15, 18, and 22, and the first air passage is formed. 8 and the second air passage 9 flow while being divided. All of the inside air and outside air pass through the heater core 13 and are heated to the maximum. Inside air is heater core 1
After being heated at 3, the air passes through the warm air bypass outlet 23 and the second warm air passage 30 to reach the front seat and rear seat foot openings 29 and 33. On the other hand, the outside air is heated by the heater core 13, passes through the first hot air passage 19 a above the hot air bypass door 22, reaches the cold / hot air mixing space 20, and from there, the outside air flows into two flows. After branching, one of the outside air flows into the defroster opening 25, and the remaining outside air flows into the front seat foot opening 29 through the communication passage 36.

As a result, the warm air heated from the low-humidity outside air flows through the defroster opening 25, and the low-humidity warm air blows out to the inner surface of the windowpane, so that the antifogging property of the windowpane is sufficiently secured. it can. In addition, a high-temperature hot air that has heated the inside air is blown out to the front and rear seat foot openings 29 and 33, so that the heating effect can be improved. In FIG. 2, an arrow C indicates a flow of inside air, and an arrow D indicates a flow of outside air.

At this time, the ratio between the amount of air blown out to the defroster opening 25 and the amount of air blown out to the foot openings 29 and 33 is determined by operating the defroster door 26 to an intermediate position to reduce the outside air on the second air passage 9 side. By flowing into the front seat foot opening 29 side, the amount of air blown out to the foot openings 29 and 33 can be set to about 80%, and the amount of air blown out to the defroster opening 25 can be set to about 20%.

Further, in the two-layer flow mode, it should be noted that despite the formation of the communication passage 36 that connects the first air passage 8 and the second air passage 9 downstream of the heater core 13. The point is that inside air is effectively prevented from entering the defroster opening 25 side. That is, as described above, in the two-layer flow mode, the ratio of the outside air amount is larger than the inside air amount (specifically, 4.5 to 5.5).
In addition, the outside air is guided by the defroster door 26 so that the dynamic pressure of the outside air that has reached the position of the cold / hot air mixing space 20 is directed to the communication passage 36, and the defroster opening 25 side Since the ventilation resistance of the front seat and rear seat foot openings 29 and 33 is sufficiently smaller than the ventilation resistance of the air passage of the inside, the dynamic pressure of the inside air reaching the front seat foot opening 29 is reduced. Is reduced by slipping into the front seat foot opening 29, so that the inside air does not flow backward through the communication passage 36 and enter the outside air on the defroster opening 25 side.

In addition, in the auxiliary air mix door 18, the first air passage 8 and the second air are in contact with the step 11b at the stop position at the time of maximum heating and the sealing surface is formed by the step 11b. The partitioning action with the passage 9 is improved, and also in this respect, the separation between the outside air and the inside air can be improved. Thereby, it is possible to prevent the inside air from leaking to the outside air layer region from the gap at the distal end portion of the hot air bypass door 22.

Next, in the foot blowing mode, when the air mixing doors 17 and 18 are operated from the maximum heating state to the intermediate opening position for controlling the blowing air temperature, the air conditioning unit 100 is in the normal mode shown in FIG. Becomes In the normal mode state, both the air mix doors 17 and 18 are operated to the intermediate opening position, and the main air mix door 17 opens the cool air bypass passage 16. Directly to the cold / hot air mixing space 20.

In conjunction with the operation of the two air mixing doors 17 and 18, the hot air bypass door 22 is operated to the position indicated by the solid line in FIG. The partitioning action on the warm air passage 19a is extinguished. Therefore, all the warm air heated by passing through the heater core 13 rises in the first warm air passage 19a and then mixes with the cool air from the cool air bypass passage 16 in the space 20 to reach a desired temperature. Most of the warm air passes through the communication passage 36, and the front and rear foot openings 2 are formed.
It reaches the 9 and 33 sides and blows out to the occupant's feet.

The remaining hot air in the space 20 reaches the defroster opening 25 and blows out to the inner surface of the window glass. In the foot blowing mode in the temperature control region shown in FIG. 4, since the maximum heating capacity is not required, the inside / outside air introduction mode is
Usually, the first and second inside air introduction ports 2 and 2a are both closed, and the whole outside air mode is set in which only the outside air introduction port 3 is opened. However, by setting by manual operation of the occupant, the outside air inlet 3 is closed and the first and second inside air inlets 2 and 2a are both opened to set a full inside air mode. May be introduced into the inside / outside air mixing mode.

In the foot blowing mode in this temperature control area, the amount of air blown to the front seat and rear seat foot openings 29 and 33 tends to decrease due to the blockage of the hot air bypass inlet 21. FIG. 4 shows the position of the door 26.
In the mode, the opening area of the communication passage 36 is changed to a position where the opening area is larger than that in FIG.

Next, FIG. 5 shows the maximum heating in the foot defroster blowing mode in which the amount of air blown out from the front and rear foot openings 29 and 33 is substantially equal to the amount of air blown out from the defroster opening 25. The state is set and the two-layer flow mode is set. In the two-layer flow mode in the foot defroster blowing mode, the position of the defroster door 26 is operated to a position that closes the communication passage 36 as understood from the comparison with FIG.

As a result, there is no air flow from the communication passage 36 to the front seat foot opening 29 side, so that the amount of air blown out from the front seat and rear seat foot openings 29 and 33 is reduced.
It is possible to make the amount of air blown from the defroster opening 25 substantially equal. The other points are the same as the two-layer flow mode in the foot blowing mode. The air conditioning unit 100
Since the ventilation resistance of each part in varies in each product, in the two-layer flow mode in the foot defroster blowing mode,
Of course, the defroster door 26 may be operated to a position where the communication passage 36 is slightly opened. In this way, in the two-layer flow mode, not only in the foot blowing mode but also in the foot defroster blowing mode, outside air flows into the front seat foot opening 29 through the communication passage 36 from the second air passage 9 side. Become.

Next, FIG. 6 shows a normal mode state in which the air mixing doors 17 and 18 are operated from the maximum heating state to the intermediate opening position for controlling the blown air temperature in the foot defroster blowing mode. In this normal mode state, in conjunction with the operation of both air mix doors 17 and 18,
The hot air bypass door 22 is operated to the solid line position in FIG. 6 to close the hot air bypass inlet 21. Therefore, in order to secure an air flow passage to the front and rear seat foot openings 29 and 33, the defroster door 26 is operated to the intermediate position shown in FIG. And the amount of air blown out to the defroster opening 25 side is substantially equalized.

FIG. 7 shows the state of the face blowing mode, in which the doors 22, 26 and 31 are respectively operated to the solid line positions to open only the air passage to the face opening 28. Both air mix doors 17 and 18 are provided with heater core 13.
The maximum cooling state in which the air inflow path to the air conditioner is fully closed is shown.
Therefore, all the cool air cooled by the evaporator 12 passes through the bypass passage 16 and blows out to the face opening 28 side.

By rotating both air mix doors 17 and 18 from the maximum cooling state to the maximum heating side, the blown air temperature in the face blowout mode can be arbitrarily adjusted. FIG. 8 shows a state of the bi-level blowing mode. In the face blowing mode, the foot / face switching door 31 is operated to the intermediate position, and the air passage to the face opening 28 and the foot opening 29 are operated. , 33 at the same time. Thereby, the cool air from the cool air bypass passage 16 mainly flows to the face opening 28 side, and the warm air from the first warm air passage 19a mainly flows to the foot openings 29 and 33. Is lower than the blowing temperature on the side of the foot openings 29 and 33, and a blowing temperature distribution of head cold foot heat is obtained. FIG. 9 shows the state of the defroster blowing mode, in which the doors 22, 2
6 and 31 are respectively operated to the solid line positions to open only the air passage to the defroster opening 25. The two air mixing doors 17 and 18 show the maximum heating state in which the cold air bypass passage 16 is fully closed.
By rotating 7, 8 from the maximum heating state to the maximum cooling side, it is possible to arbitrarily adjust the blow-out air temperature in the defroster blow-out mode.

In the defroster blowing mode, the hot air bypass door 22 is operated to close the hot air bypass inlet 21 to prevent the hot air from flowing out to the second hot air passage 30 side. (Other Embodiments) In the above embodiment, each door 4, 5, 1
The case where the operations of 7, 18, 22, 26, and 31 are performed by an actuator such as a servomotor via a link mechanism has been described, but the inside / outside air introduction setting lever, temperature control lever, and blowing mode provided on the air conditioning operation panel are described. Each of the doors may be operated by a manual operation force applied to a manual operation member such as a lever.

In the above embodiment, the case where the hot air bypass door 22 is driven by the actuator mechanism independent of the air mix doors 17 and 18 has been described.
The rotating shaft 23 of the hot air bypass door 22 may be connected to the link mechanism of the air mixing doors 17 and 18 so that the hot air bypass door 22 and the air mixing doors 17 and 18 can be driven by a common actuator.

In this case, even in a mode other than the foot blowing mode and the foot defroster blowing mode, for example, in the defroster blowing mode, even if both the air mix doors 17 and 18 are in the maximum heating state, the hot air bypass door 22 is still in the hot air bypass door. The closed position of the inlet 21 (the position indicated by the two-dot chain line in FIG. 2) is maintained. That is, in the maximum heating in the foot blowing mode and the foot defroster blowing mode, and in the maximum heating in the other blowing modes,
What is necessary is just to change the rotation amount of the servo motor for driving the air mixing door.

The present invention can of course be similarly applied to an air conditioner in which the evaporator (cooling heat exchanger) 12 is not provided in the air conditioning unit 100. The maximum heating time when the two-layer flow mode is set is not strictly limited when the air mix doors 17 and 18 are operated to the positions where the cool air bypass is completely prevented. This also includes the case of the air mix door position that allows the bypass of the cool air.

Further, it goes without saying that the present invention can be similarly applied to an air conditioner in which the rear seat foot opening 33 in the above embodiment is eliminated. Further, in the above-described embodiment, the case where the step 11b which forms the sealing surface of the auxiliary air mix door 18 is provided for the air mix doors 17 and 18 in which the rotation areas 17b and 18b overlap with each other has been described. Air mix door 1
The present invention is not limited to the case where the rotation regions 7 and 18 are provided. For example, doors such as the blowout mode doors 26 and 31 may be provided when the rotation regions overlap.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a ventilation system according to an embodiment of the present invention.

FIG. 2 is a sectional view of the air conditioning unit of FIG.

FIG. 3 is a cross-sectional view showing a state of a two-layer flow mode in a foot blowing mode of the embodiment.

FIG. 4 is a sectional view showing a state of a normal mode in a foot blowing mode of the embodiment.

FIG. 5 is a sectional view showing a state of a two-layer flow mode in a foot defroster blowing mode of the embodiment.

FIG. 6 is a sectional view showing a state of a normal mode in a foot defroster blowing mode of the embodiment.

FIG. 7 is a cross-sectional view showing a face mode state of the embodiment.

FIG. 8 is a cross-sectional view showing a state in a bilevel mode of the embodiment.

FIG. 9 is a cross-sectional view showing a state of a defroster blowing mode of the embodiment.

10 is a cross-sectional view taken along the line XX of FIG. 2, wherein (a) shows the configuration of the same embodiment, and (b) shows the configuration of a comparative example.

[Explanation of symbols]

8, 9: first and second air passages, 11: air conditioning case, 11
b: step, 12: evaporator, 13: heater core, 16: cold air bypass passage, 17: main air mixing door, 18: auxiliary air mixing door, 17b, 18b: rotating area, 25
... defroster opening, 26 ... defroster door, 28 ... face opening, 29 ... front seat foot opening, 31 ... foot face switching door, 33 ... rear seat foot opening, 1
00 ... air conditioning unit.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshihiko Muraki 1-1-1, Showa-cho, Kariya-shi, Aichi Pref.

Claims (4)

[Claims] 1. Two flat doors (17, 18) for controlling an air flow in air passages (8, 9) are provided adjacent to each other and rotatable, and the two flat doors (17, 18) are provided. 17 and 18) are partially overlapped with each other, and one of the two doors (17 and 18) is provided at a portion of the wall of the air passage (8 and 9) where the rotation area overlaps. A step (11b) is provided in which only one of the doors (18) comes into contact and the other door (17) does not come into contact, and the step (11b) forms a sealing surface at the stop position of the one door (18). A door device for an air passage characterized by the above-mentioned. 2. The step (11b) extends over the entire length of the one door (18) from the end on the rotation center side to the end on the side opposite to the rotation center of the one door (18). 2. The door device for an air passage according to claim 1, wherein the door device is formed so as to contact with the door. 3. An air passage door device according to claim 1, wherein said one door (18) is connected to said step (1).
1b), when the door is operated to the stop position, the one door (18) moves through the air passages (8, 9).
An air conditioner for a vehicle, wherein a first air passage (8) through which inside air flows and a second air passage (9) through which outside air flows are defined. 4. A heating heat exchanger (1) for heating conditioned air.
3), a cool air bypass passage (16) for bypassing the heating heat exchanger (13) and allowing conditioned air to flow, and an air volume passing through the heating heat exchanger (13) and the cold air bypass passage (16). An air mix door (17, 18) for adjusting a ratio of an air volume to an air volume passing through the vehicle; a foot opening (29, 33) connected to a foot outlet for blowing air toward the feet of an occupant in the vehicle; A defroster opening (25) connected to a defroster outlet for blowing air toward the inner surface of the window glass; and a blowout opening both the foot opening (29, 33) and the defroster opening (25) simultaneously. In the mode, at the time of maximum heating in which the air mix doors (17, 18) are operated to a position where the cool air bypass passage (16) is fully closed, at least the inside air passage is allowed to pass through the passage of the conditioned air. First air passage (8) and partitioned formed a second air passage through which outside air (9), the foot opening said first air passage (8) to (29,3
An air conditioner for a vehicle that communicates with the third air passage (3) and the second air passage (9) with the defroster opening (25). A main air mixing door (17) and an auxiliary air mixing door (18), which are disposed on the upstream side of the air flow of the vessel (13) and operated to rotate in conjunction with each other. 17) and a part of the rotation area of the auxiliary air mixing door (18) is wrapped, and the auxiliary air mixing door is provided at a portion of the wall surface of the air passages (8, 9) where the rotation area overlaps. A step (11b) is provided in which only the main air mixing door (17) abuts, and the main air mixing door (17) does not abut. In the two-layer flow mode in which the first air passage (8) and the second air passage (9) are defined, the cool air bypass passage is formed by the main air mixing door (17). (16) and the auxiliary air mix door (18)
Abuts against the step (11b) to partition and form the upstream portion of the air flow of the heating heat exchanger (13) into the first air passage (8) and the second air passage (9). A vehicle air conditioner characterized by the above-mentioned.