JPH10109520A - Vehicular air-conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set the gas quantity ratio between a foot defroster mode and a foot mode for a desired value, in two laminar flow mode which can partition and pour an inner air and an outer air. SOLUTION: In a blow out mode for opening both of foot opening parts 29, 33 and a defroster opening part 25 simultaneously, at the maximum warming time, at least the passage of an airconditioning air is partitioned and formed to the first air passage 8 of an inner air side and the second air passage 9 of an outer air side and the first air passage 8 is communicated with foot openings 29, 32 and the second air passage 9 is communicated with a defroster opening part 25. At the two laminar flow mode time for partitioning and forming the first/second air passages 8, 9, a communication passage 36 for communicating the first/second air passages 8, 9 is formed in the air downstream side of a heat exchanger for warming 13 and a defroster side door means 26 is operated to an opening position in which the outer air amount flowing in a foot opening side through the communication passage 36 becomes bigger at the time when the foot blow out mode is set rather than the time in which the foot defroster blow out mode is set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a passage of air-conditioned air into a first air passage on the inside air side and a second air passage on the outside air side, so that the high temperature inside air warmed from the foot outlet is formed. The present invention relates to an air conditioner for a vehicle that recirculates and blows out air while blowing out low-humidity outside air from a defroster outlet to achieve both improvement in heating capacity and anti-fog property 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]

By the way, when the foot defroster mode is selected as the blowout mode, the flow rate from the foot outlet is generally set to about 50%, and the flow rate from the defroster outlet is set to about 50%. I have. On the other hand, when the foot mode is selected, normally, the amount of air blown out from the foot outlet is about 80%, and the amount of air blown out from the defroster outlet is about 20%.

However, in the two-layer flow mode, the passage of the conditioned air is divided into the first air passage on the inside air side and the second air passage on the outside air side. It is an important issue in the actual design to achieve the condition in the mode. In view of the above, the present invention is to provide a two-layer flow mode in which the inside air and the outside air can be separated and flowed, so that the air flow ratio between the foot defroster blowing mode and the foot blowing mode can be set to a desired value. With the goal.

[0008]

In order to achieve the above object, the present inventors have established a first air passage on the inside air side and an outside air passage on the downstream side of the air in the heating heat exchanger in the two-layer flow mode. A communication passage communicating with the second air passage on the side is provided, and a change in the air flow rate between the foot defroster blowing mode and the foot blowing mode is established by a change in the air flow passing through the communication passage.

That is, in the inventions according to claims 1 to 4,
Foot openings (29, 33) and defroster openings (2
When the maximum heating state is set in the blowing mode in which both of the above 5) are simultaneously opened, at least 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 passage of the conditioned air. The first air passage (8) communicates with the foot openings (29, 33), and the second air passage (9) communicates with the defroster opening (2).
5), and in a two-layer flow mode in which the first air passage (8) and the second air passage (9) are defined, the air is downstream of the heating heat exchanger (13). , A communication path (36) for communicating the first air path (8) and the second air path (9), and further, a foot-side door means for controlling air flow to the foot openings (29, 33). (22, 31), and a defroster side door means (26) for controlling the air flow to the defroster opening (25) and the communication passage (36), and the foot opening is set as the blowing mode in the two-layer flow mode. A foot defroster blowing mode in which the amount of air blown out from the (29, 33) and the amount of air blown out from the defroster opening (25) is substantially equal, and the amount of air blown out from the foot opening (29, 33) is changed to the defroster opening ( 25)) It is possible to set a foot outlet mode that is significantly larger than the amount, and the communication path (36) is more effective when the foot outlet mode is set than when the foot defroster outlet mode is set in the two-layer flow mode. )
The defroster side door means (26) at an opening position where the amount of outside air flowing into the foot opening portions (29, 33) through the opening is large.
Is operated.

As described above, in the two-layer flow mode, the communication path (36) for communicating the inside air flow to the foot side and the outside air flow to the defroster side is formed, and the communication path (36) is formed through the communication path (36). (2) The flow rate of the outside air flowing from the air passage (9) to the first air passage (8) can be adjusted by the opening position of the defroster-side door means (26). Therefore, the air flow ratio between the foot defroster blowing mode and the foot blowing mode can be set to a desired value depending on the opening position of the defroster side door means (26).

The reference numerals in parentheses attached to the respective means indicate the correspondence with specific means described in the embodiments described later.

[0012]

1 and 2 show one embodiment of the present invention. This embodiment is sufficiently 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 rotation shafts 4a and 5a, respectively. The inside and outside of the air conditioner are controlled by actuators such as a link mechanism and a servo motor (not shown). 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 inlet 2 and closes the outside air passage 3 a from the outside air inlet 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.

Accordingly, 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 4 and the second fan 5. The partition plate 10 can be integrally formed with a resin scroll casing 10a that houses the fans 6 and 7.

Further, in this 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 improve the heating capacity and ensure the anti-fog properties of the window glass at the same time. 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.

More specifically, the second passage 9 side is made larger than the passage cross-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 between the inside air amount and 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 is of a type in which an evaporator (cooling heat exchanger) 12 and a heater core (heating heat exchanger) 13 are both integrated in an air-conditioning case 11. Hereinafter, the air conditioning unit 10
The specific structure of part 0 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 at a substantially central portion in the lateral direction of the vehicle in a lower portion of the instrument panel in the vehicle compartment. 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 9 immediately after the evaporator 12.
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 extending 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 main air mix door 17 and an auxiliary air mix door 18 are arranged. 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 disposed 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. The air mixing doors 17 and 18 are turned to the position where they wrap each other as shown by the two-dot chain line in FIG. Both air mix doors 17 and 18 are pressed against the protruding ribs on the air conditioning case 11 side, and 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 mix 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.

Particularly, 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. In addition,
The evaporator 12 is of a well-known lamination type, and is formed by laminating a large number of flat tubes formed by laminating two thin metal plates made of aluminum or the like with corrugated fins therebetween and brazing integrally. 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 vertically in the air downstream of the heater core 13 (portion on the rear side of the vehicle) with a predetermined interval between the heater core 13 and the heater core 13. The partition wall 19 forms a warm air passage 19a extending upward from immediately after the heater core 13. The downstream side (upper side) of the hot air passage 19a merges with the cool air bypass passage 16 above the heater core 13 to form a cool / hot air mixing space 20 for mixing the cool air and the hot air.

A warm air bypass inlet 21 is opened at the lower end of the partition wall 19 so as to face the air 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 according to a blow-out air temperature control signal and a blow-out mode control signal of the air conditioner through an unillustrated link mechanism and an actuator such as a servomotor. ing. When the maximum heating state is set (two-layer flow mode) in a foot blow mode and a foot defroster blow mode described later, this hot air bypass door 22
(The position near the partition line B of the heater core 13)
To act as a movable partition member for partitioning the hot 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 the auxiliary air mix door 1
8, the tip of the door 22 is the second
It is set so as to shift by a predetermined amount to the air passage 9 side.

The heater core 13 is a well-known one, 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 air upstream side of the heater core 13,
The partition line B and the rotation axis 1 of the auxiliary air mix door 18
7a 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 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.

Inlet hole 29a of 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 hot air passage 30 flows into the rear seat foot opening 33, and the hot air flows from the rear seat foot outlet through a rear seat foot duct (not shown). Warm air is blown to the feet of the rear passengers.

At the lower end of the hot-air bypass inlet 21, a hot-air guide plate 34 for guiding hot air toward the hot-air passage 30 is provided. In the present embodiment, the heater core 13 is in the two-layer flow mode in the foot blowing mode.
On the downstream side of the air, the hot air bypass door 22 is operated to the solid line position to partition the first and second air passages 8 and 9, and the defroster door 26 opens the communication passage 36, whereby the communication passage 36 is opened. The first and second air passages 8 and 9 communicate with each other in the vicinity of the front seat foot opening 29 through the opening.

The defroster door 26 and the foot / face switching door 31 are door means for switching the blowing mode. The door means is connected to a link mechanism (not shown), and the blowing mode control of the air conditioner is controlled 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. 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, the air mixing doors 17 and 18 are rotated to the positions indicated by solid lines in the drawing, so that the main air mixing door 17 completely 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 to the position indicated by the solid line in FIG.
a acts as a movable partition member for partitioning the first air passage 8 into the first air passage 8 and the second air passage 9, and opens the hot air bypass inlet 21. Further, 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 opens both of them 25a and 36. 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 reaches the front and rear seat foot openings 29 and 33 through the hot air bypass inlet 23 and the hot air passage 30. On the other hand, the outside air is the heater core 1
After being heated in 3, the hot air passes through a hot air passage 19 a above the hot air bypass door 22 to reach a cold / hot air mixing space 20, from which outside air branches into two flows, one of which is a defroster. The remaining outside air flows into the opening 25 and flows into the front seat foot opening 29 through the communication passage 36.

As a result, warm air heated from low-humidity outside air flows through the defroster opening 25, and the warm air of low humidity 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 of 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 the 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.

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 air mix 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 passage 19a is extinguished. Therefore, all the warm air heated by passing through the heater core 13 rises in the 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 reaches the front seat and rear seat foot openings 29 and 33, and blows out to the feet of the occupant.

The remaining warm 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 region, 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, so that the defroster 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 from the front and rear foot openings 29 and 33 and the amount of air blown from the defroster opening 25 are substantially equal. 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 flowing from the communication passage 36 into 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 blow-out air temperature in the face blow-out mode can be arbitrarily adjusted. FIG. 8 shows the state of the bi-level blowing mode. In the face blowing mode, the foot / face switching door 32 is operated to the intermediate position, and the air passage toward the face opening 28 and the foot opening 29 are opened. , 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 warm air passage 19a mainly flows to the foot opening 2.
Since the air flows to the sides 9 and 33, the outlet temperature at the face opening 28 side becomes lower than the outlet temperature at the foot openings 29 and 33 side, and the outlet temperature distribution of head and foot heat is obtained.

FIG. 9 shows the state of the defroster 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 defroster opening 25. The air mixing doors 17 and 18 are in the maximum heating state in which the cold air bypass passage 16 is fully closed. However, by rotating the air mixing doors 17 and 18 from the maximum heating state to the maximum cooling side, the defroster blows out. The outlet air temperature in the mode can be adjusted arbitrarily.

In the defroster blowing mode, the hot-air bypass door 22 is operated at a position to close the hot-air bypass inlet 21 to prevent the hot air from flowing out to the 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.

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.

In the above embodiment, the heater core 13
The air mixing doors 17 and 18 for adjusting the ratio of the amount of cold air to the amount of hot air are used as temperature adjusting means for adjusting the air temperature by adjusting the heating amount of the conditioned air by the air mixing doors 17 and 18. Instead, an air conditioner of a type that uses a hot water valve that adjusts the flow rate or temperature of hot water flowing into the heater core 13 and adjusts the air temperature by adjusting the hot water flow rate (or hot water temperature) of the hot water valve. Similarly, the present invention can be applied.

In the above embodiment, the case where the hot air bypass door 22 is driven by a drive mechanism provided independently of the drive mechanism (link mechanism and drive servomotor) of the air mix doors 17 and 18 has been described. It is also possible to drive the hot air bypass door 22 using a common drive mechanism with the air mix doors 17 and 18. For example,
The rotating shaft 23 of the hot air bypass door 22 is connected to the output shaft of the servo motor for driving the air mixing doors 17 and 18 via an appropriate link mechanism, and a mode other than the foot blowing mode and the foot defroster blowing mode, for example, In the defroster blowing mode, both air mix doors 1
Even when the heaters 7 and 18 are in the maximum heating state, the hot-air bypass door 22 is in the closed position of the hot-air bypass inlet 21 (2 in FIG. 2).
(Dashed line position), and the hot air bypass door 22 is opened only during the maximum heating in the foot blowing mode and the foot defroster blowing mode.
From the closed position to the partitioning position of the first air passage 8 and the second air passage 9.

For this purpose, during the maximum heating in the foot blowing mode and the foot defroster blowing mode, the rotation amount of the servo motor for driving the air mix door is increased more than during the maximum heating in the other blowing modes, and the rotation of the servo motor is increased. Due to the increase in volume, both air mix doors 1
With the warm air bypass door 22 closed from the closed position of the warm air bypass inlet 21 while the air conditioners 7 and 18 are maintained in the maximum heating state,
What is necessary is just to switch to the partition position of the air passage 8 and the 2nd air passage 9.

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. In the above-described embodiment, one hot-air bypass door 22 has a function as a movable partition member in the two-layer flow mode and the hot-air bypass inlet 2.
1, which also serves as a movable partition member in a two-layer flow mode in accordance with a change in the configuration of the hot air passage 30 in the air conditioning unit. , Hot air bypass inlet 21
May be divided into two doors, one for opening and closing.

[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.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Blower unit, 2, 2a ... Inside air introduction port, 3 ... Outside air introduction port, 4, 5 ... 1st, 2nd inside / outside air switching door, 6, 7 ...
1st, 2nd fan, 8, 9 ... 1st, 2nd air passage, 11
... air-conditioning case, 12 ... evaporator, 13 ... heater core, 16
... Cool air bypass passage, 17 ... Main air mixing door, 18
... Auxiliary air mix door, 21 ... Inlet of hot air bypass,
22: hot air bypass door, 25: defroster opening, 2
6: Defroster door, 28: Face opening, 29: Front seat foot opening, 30: Hot air passage, 31: Foot face switching door, 33: Rear seat foot opening, 100 ...
Air conditioning unit.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Tetsuya Takechi 1-1-1, Showa-cho, Kariya-shi, Aichi Pref.

Claims (4)

[Claims] A heating heat exchanger (1) for heating conditioned air.
3) and temperature adjusting means (17, 1) for adjusting the heating temperature of the conditioned air by the heating heat exchanger (13) to adjust the air temperature.
8), a foot opening (29, 33) connected to a foot outlet for blowing air toward the passenger's feet, and a defroster connected to a defroster outlet for blowing wind toward the inner surface of the vehicle window glass. An opening (25), and in the blowing mode in which both the foot opening (29, 33) and the defroster opening (25) are simultaneously opened, the temperature adjusting means ( When the maximum heating state in which the air conditioners 17 and 18) are operated is set, at least the air-conditioned air passage is divided into a first air passage (8) through which inside air flows and a second air passage (9) through which outside air flows. Forming the first air passage (8) with the foot opening (29, 3);
3) and the second air passage (9) is communicated with the defroster opening (25). The first air passage (8) and the second air passage (9) In the two-layer flow mode in which the first air passage (8) and the second air passage (9) are communicated downstream of the heating heat exchanger (13) in the two-layer flow mode, ), And further, foot-side door means (22, 31) for controlling the air flow to the foot openings (29, 33), and the defroster opening (25) and the communication passage (36).
Door means on the defroster side for controlling the flow of air to the air (26)
A foot defroster blowing mode in which a blowing air amount from the foot openings (29, 33) is substantially equal to a blowing air amount from the defroster opening (25) as the blowing mode in the two-layer flow mode. And the foot openings (29, 3
3) The amount of air blown out from the defroster opening (25)
It is possible to set a foot blowing mode that is significantly larger than the amount of air blown out from the controller. When the foot blowing mode is set, the foot defroster blowing mode is set in the two-layer flow mode. However, the defroster side door means (26) is operated at an opening position where the amount of outside air flowing into the foot openings (29, 33) through the communication passage (36) becomes large. A vehicle air conditioner characterized by the above-mentioned. 2. When the foot defroster blowing mode is set in the two-layer flow mode, the defroster side door means (26) is operated at a position to close the communication passage (36). The vehicle air conditioner according to claim 1, wherein: 3. The foot-side door means opens the foot air in the first air passage (8) heated through the heating heat exchanger (13) in the two-layer flow mode. The first foot door means (22) for flowing into the section (29, 33) side and the second foot door means (31) for opening the communication passage (36) when the foot blowing mode is set. 2. The device according to claim 1, wherein
Or the vehicle air conditioner according to 2. 4. A face opening (28) connected to a face outlet for blowing air toward an occupant's head, wherein the second foot door means (31) is provided in the foot defroster blowing mode and the foot blowing. The vehicle air conditioner according to claim 3, wherein when the mode is set, the communication path (36) is opened, and the face opening (28) is closed.