JPH10324145A - Vehicular air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the heating capacity by adding an auxiliary heating heat source and set the temperature difference of blown-off air between an internal air side passage and an external air side passage to a desired value, in a vehicular air conditioner capable of setting two, internal and external air laminar flow mode. SOLUTION: A heater core 16 as heat source of hot-water is arranged to be extended over both the first air passage 80 on the internal air side and the second air passage 90 on the external air side, and an auxiliary electric heater 16 for heating air conditioning air is arranged to be extended over both the first air passage 80 on the internal air side and the second air passage 90 on the external air side. Thus, by utilizing the heating action of the auxiliary electric heater 16, the heating capacity and the defogging performance of window glass can be improved even when the temperature of hot-water is low. Further, the temperature difference of blown-off air between both the air passages can be easily set to a desired value by selecting the proportion of the installation areas of the auxiliary electric heater 16 in both the air passages 80, 90.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle in which an auxiliary heating device (such as an auxiliary electric heater) is used as an air heating source in addition to a hot water type heating device. By partitioning into the first air passage on the inside air side and the second air passage on the outside air side, warmed high-temperature inside air is recirculated and blown out from the foot opening, while low humidity is discharged from the defroster opening. The present invention relates to a vehicle air conditioner that can set a so-called inside / outside air two-layer flow mode in which outside air is blown.

[0002]

2. Description of the Related Art Conventionally, a vehicle air conditioner capable of setting a two-layer flow mode of the inside / outside air of this type is known from Japanese Patent Application Laid-Open No. 5-124426 and the like. An air intake port and an outside air intake port are formed at one end of the air conditioning case, and a foot opening, a defroster opening, and a face opening are formed at the other end.

In the air conditioning case, a first air passage extending from the inside air intake port to the face opening and the foot opening, and a second air passage extending from the outside air intake port to the defroster opening 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.

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. As a result, the interior air that has already been heated can be recirculated and blown out from the foot openings to heat the interior of the vehicle, so that the temperature of the air blown into the interior of the vehicle can be increased and the heating performance can be improved. At the same time, low humidity outside air is blown out from the defroster opening to the window glass, so that the anti-fog performance of the window glass can be secured.

[0006]

In recent years, the temperature of hot water (engine cooling water), which is a heat source for vehicle heating, tends to decrease due to higher efficiency of the vehicle engine. Is a major issue. However, there are cases where the above conventional technology cannot sufficiently cope with such a shortage of the heating capacity.

In view of the above, it is an object of the present invention to provide a vehicle air conditioner capable of setting a two-laminar flow mode between inside and outside air, and to solve the shortage of heating capacity by adding an auxiliary heating heat source. Further, the present invention can set the difference in the temperature of the blown air between the inside air passage and the outside air passage to a desired value by the installation form of the auxiliary heating heat source in this type of inside / outside air two laminar flow type vehicle air conditioner. The purpose is to be.

[0008]

The present invention focuses on an auxiliary heating device (auxiliary electric heater or the like) used when the temperature of hot water is low during heating in winter. In the present invention, the installation mode of the auxiliary heating device is devised. , To achieve the above object. In other words, according to the first to eighth aspects of the invention, the heating heat exchanger (13) for the hot water heat source is connected to the first air passage (8, 80) on the inside air side and the second air passage (9, 90) on the outside air side. The auxiliary heating device (16) is connected to the first air passage (8, 80) on the inside air side and the outside air downstream of the heating heat exchanger (13) of the hot water heat source. The second air passages (9, 90) on both sides are arranged so as to straddle both.

According to this, in the blowing mode in which both the foot opening (25) and the defroster opening (19) are simultaneously opened, the inside / outside air switching means (2, 2a, 3, 4,.
When the inside / outside air two-layer flow mode is selected in 5), the inside air is heated by the heating heat exchanger (13) through the first air passages (8, 80) and then blown out from the foot opening (25). After the outside air is heated by the heating heat exchanger (13) through the second air passage (9, 90), it can be blown out from the defroster opening (19).

In this case, the auxiliary heating device (16)
The inside air of the first air passages (8, 80) and the outside air of the second air passages (9, 90) can both be heated by the heat radiation from the heater, so that the heating capacity and the anti-fog performance of the window glass can be improved even when the temperature of the hot water is low. It can be improved effectively. Furthermore, the auxiliary heating device (16) is connected to a first air passage (8, 80) on the inside air side,
The auxiliary heating device (16) can be arranged so as to straddle both the second air passages (9, 90) on the outside air side in all the outside air modes other than the inside / outside air two-layer flow mode and in the whole inside air mode. The heating capacity and the anti-fog performance of the window glass can be improved by the heat radiation from the first and second air passages by selecting the installation area of the auxiliary heating device (16) in the first and second air passages. The blown air temperature difference can be easily set to a desired value.

[0011] For example, in the auxiliary heating device (16), the first air passages (8, 80) are provided.
If the area located inside the second air passage (9, 90) is made larger than the area located inside the second air passage (9, 90), the amount of heat released into the first air passage (8, 80) of the auxiliary heating device (16) is reduced to the second air passage (8, 80). It can be larger than the amount of heat released into the air passages (9, 90).

Since the temperature of the inside air flowing in the first air passage (8, 80) is higher than the outside air temperature flowing in the second air passage (9, 90), the difference in the amount of heat dissipation is added to this. In addition, the blow-out temperature (foot blow-out temperature) of the inside air flowing through the first air passage can be made sufficiently higher than the blow-out temperature (defroster blow-out temperature) of the outside air flowing through the second air passage. Therefore, the heating capability to the feet of the occupant can be preferentially increased.

[0013] Conversely, according to the present invention, the first air passages (8, 8) of the auxiliary heating device (16) are provided.
80) to the second air passage (9, 90).
If it is smaller than the area located inside, the auxiliary heating device (1
The amount of heat radiation into the second air passages (9, 90) can be larger than the amount of heat radiation into the first air passages (8, 80) in (6).

Therefore, even if the temperature of the inside air flowing through the first air passage is higher than the temperature of the outside air flowing through the second air passage, the first and second air passages are not affected.
It is also possible to eliminate the difference in the blown air temperature by setting the blown air temperatures of the second air passages to the same temperature. Therefore, the blowing temperature of the outside air (the defroster blowing temperature) can be increased, and the anti-fog performance of the window glass can be preferentially enhanced. Also,
According to the second aspect of the present invention, the heating heat exchanger (13) of the hot water heat source is supplied with hot water from one of the first air passage (8, 80) and the second air passage (9, 90) toward the other. It is characterized in that it is configured as a one-way flow type in which the air flows.

According to this, since the heating heat exchanger (13) is of a type in which hot water flows in one direction (all passes), the hot water flow path has a low pressure loss and the width of the heating heat exchanger (13) is small. There is an advantage that there is no difference in the blowing temperature in the direction (tube arrangement direction). On the other hand, since the flow direction of the hot water of the heating heat exchanger (13) is one direction, the temperature of the blown air decreases at the hot water outlet side due to the decrease of the hot water temperature. If the installation area ratio of the auxiliary heating device (16) is increased, the decrease in the temperature of the blown air at the hot water outlet side can be offset by the heat release amount of the auxiliary heating device (16).

Further, as in the third aspect of the present invention, the heating heat exchanger (13) is heated with hot water from the first air passage (8, 80) side to the second air passage (9, 90) side. Is configured to flow, the temperature of the blown air on the side of the first air passage (8, 80) is increased on the blow side of the heating heat exchanger (13), and the temperature of the blow air on the side of the second air passage (9, 90) is increased. The blown air temperature can be reduced.

Therefore, in the whole outside air mode, the temperature of the defroster blown out of the second air passage (9, 90) can be lower than the temperature of the foot blown out of the first air passage (8, 80). The temperature distribution can be made to be a comfortable state of the head-and-foot-hot type. Similarly, in the bi-level mode with all the outside air or all the inside air, the conditioned air from the first air passage (8, 80) is blown out from the foot opening (25) and the conditioned air from the second air passage (9, 90). By blowing out the conditioned air from the air from the face opening (21), the temperature distribution in the vehicle cabin can be made to be in a comfortable state in which the head is cold and hot.

The auxiliary heating device may be constituted by an auxiliary electric heater (16). Note that the reference numerals in parentheses attached to the above-described units indicate the correspondence with specific units described in the embodiments described later.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 shows an embodiment of the present invention, and is applied to a low heat source vehicle in which hot water (engine cooling water) temperature is relatively low, such as a diesel engine vehicle. The air conditioner ventilation system is roughly divided into two parts, a blower unit 1 and an air conditioning unit 100. The air-conditioning unit 100 is disposed at a substantially central portion in the vehicle left-right direction in a lower portion of the instrument panel in the vehicle interior. On the other hand, the blower unit 1 is configured as shown in FIG.
The state where it arrange | positions at the vehicle front side of the air conditioning unit 100 is shown. That is, the layout is such that the air conditioning unit 100 is arranged in the vehicle interior, and the blower unit 1 is arranged at a position in front of the air conditioning unit 100 in the engine room.

Here, it is possible to adopt a layout in which the blower unit 1 is offsetly arranged on the side (passenger seat side) of the air conditioning unit 100 in the passenger compartment. First, the blower unit 1 will be specifically described. First and second two inside air inlets 2 and 2a for introducing inside air (vehicle interior air) into the blower unit 1 and outside air (outside the vehicle interior). air)
Is provided with one outside air inlet 3. These inlets 2, 2a, 3 can be opened and closed by first and second two inside / outside air switching doors 4, 5, respectively.

The inside / outside air switching doors 4 and 5 are flat plates that are pivotally operated around the rotating shafts 4a and 5a, respectively. (Not shown) is connected to a manual operation mechanism for switching between inside and outside air (a mechanism using a lever and a dial), and is operated in conjunction with the inside or outside air switching door 4,
5 is operated in conjunction with an inside / outside air switching actuator mechanism using a servomotor.

In this embodiment, the inside / outside air switching means is constituted by the inside / outside air introduction ports 2, 2a, the outside air introduction port 3, the inside / outside air switching doors 4, 5, and the manual operation mechanism or the actuator mechanism. 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 7b.

FIG. 1 shows a state of a two-layer flow mode to be described later. The first inside / outside air switching door 4 opens the first inside air inlet 2 and closes the outside air passage 3a from the outside air inlet 3. Therefore, the inside air is sucked into the suction port 6 a of the first (inside air) fan 6. On the other hand, the second inside / outside air switching door 5 closes the second inside air introduction port 2 a and closes the outside air passage 3 from the outside air introduction port 3.
Since b is open, 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 supplied to the first air passage (inside air passage).
8, the second fan 7 blows outside air from the outside air inlet 3 to a second air passage (outside air side passage) 9, and the first and second air passages 8, 9 Partitioned by a partition plate 10 disposed 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.

In this embodiment, the outer diameter of the first fan 6 is made smaller and the outer diameter of the second fan 7 is made larger. This is to prevent the opening area of the suction port 7a from decreasing due to the presence of the electric motor 7b on the second fan 7 side. Next, 100 units of the air conditioning unit are
In this type, both an evaporator (cooling heat exchanger) 12 and a heater core (heating heat exchanger) 13 are integrally incorporated. The air-conditioning case 11 is made of a molded article of a resin having a certain degree of elasticity such as polypropylene and having excellent strength, and is composed of a plurality of divided cases having divided surfaces in the vertical direction (vehicle vertical direction) in FIG. . After storing the heat exchangers 12, 13 and devices such as doors to be described later in the plurality of divided cases, the plurality of divided cases are integrally connected by fastening means such as metal spring clips and screws. The air conditioning unit 100 is assembled.

In the air-conditioning case 11, an evaporator 12 is installed at a position closest to the front of the vehicle, and the evaporator 12 is disposed so as to cross the entire first and second air passages 80 and 90 in the air-conditioning case 11. ing. As is well known, the evaporator 12 cools the conditioned air by absorbing the latent heat of evaporation of the refrigerant in the refrigeration cycle from the conditioned air. Here, as shown in FIG. 1, the evaporator 12 is installed in the air-conditioning case 11 in a thin form in the vehicle front-rear direction.

The air passage inside the air-conditioning case 11 is
From the upstream portion of the evaporator 12 to the downstream portion of the heater core 13, the partition plates 15a, 15b, 15c, and 15d separate the first air passage (inside air passage) 80 on the lower side of the vehicle and the second air passage (inner air side) on the upper side of the vehicle. 90). The partition plates 15a to 15d are fixed partition members which are formed integrally with the air-conditioning case 11 by resin and extend substantially horizontally in the vehicle left-right direction.

The evaporator 12 is of a well-known lamination type, in which a number of flat tubes each formed by laminating two thin metal plates of aluminum or the like in the middle are laminated and arranged with corrugated fins therebetween. It is brazed. The interior of the evaporator 12 is divided into partition plates 15a, 15a, 1b by a fin surface of a corrugated fin or a flat surface of a flat tube.
Since the air passage can be partitioned on the extension of the end of 5b, the first air passage 80 and the second air passage 90 can also be defined inside the evaporator 12.

The heater core 13 is disposed downstream of the evaporator 12 on the air flow side (rear side of the vehicle) with a predetermined space therebetween. 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 installed in the air-conditioning case 11 in a thin shape in the vehicle front-rear direction. More specifically, the heater core 13 is disposed between the partition plates 15b and 15c so as to straddle both the first air passage 80 and the second air passage 90. In addition, the portion of the heater core 13 on the side of the second air passage 90 is
Is installed so as to cross the entire area of the heater core 13.
Of these, the portion on the first air passage 80 side is installed at the lowermost portion of the first air passage 80 so as to form a cool air bypass passage 17 described later.

Note that the heater core 13 is a well-known one, and a 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 via corrugated fins, and are integrally brazed. Things. The inside of the heater core 13 has a partition plate 15b formed by a fin surface of a corrugated fin or a flat surface of a flat tube.
The air passage can be partitioned on the extension of the end of 15c, whereby the first air passage 80 and the second air passage 90 can also be defined inside the heater core 13.

In the heater core 13 of this embodiment, the hot water inlet side tank 13a is disposed on the lower first air passage 80 side, and the hot water outlet side tank 13b is disposed on the upper second air passage 90.
It is located on the side. And these two tanks 13a, 13
A heat exchange core portion 13c composed of the flat tube and the corrugated fin is formed between the flat tubes b and b. Therefore, the heater core 13 is configured as a one-way flow type (all-pass type) in which hot water from the hot water inlet side tank 13a flows in one direction from below to above in the flat tube of the heat exchange core portion 13c.

A hot water valve 14 for adjusting the flow rate (or temperature of hot water) of the hot water flowing into the heater core 13 is provided, and the hot water valve 14 blows out into the vehicle cabin by adjusting the flow rate of hot water (or hot water temperature). The air temperature can be adjusted. That is, in the present embodiment, the hot water valve 14 constitutes a temperature adjusting means for adjusting the temperature of the air blown into the vehicle interior.

An auxiliary electric heater 16 is disposed immediately after the heater core 13 on the downstream side of the air. The auxiliary electric heater 16 is provided between the partition plates 15c and 15d.
The air passage 80 and the second air passage 90 are disposed so as to straddle both. The auxiliary electric heater 16 is disposed over the entire width of the first air passage 80 and the second air passage 90 in the direction perpendicular to the plane of FIG.

The auxiliary electric heater 16 is capable of sufficiently increasing the temperature of the hot water when the temperature of the hot water is lower than a predetermined temperature (for example, 75 ° C.) (for example, when the temperature of the hot water is low, such as immediately after starting the engine, or even after the engine has been warmed up). This is an auxiliary heating device for quickly heating the conditioned air due to its heat-generating action. The auxiliary electric heater 16 is preferably composed of a positive temperature coefficient thermistor (PTC heater) having a positive resistance temperature characteristic in which the resistance value rapidly increases at a predetermined temperature in terms of safety and the like.

The auxiliary electric heater 16 is, specifically,
PT made of ceramic material such as barium titanate
The C heater is formed into a honeycomb shape having a large number of holes for air passage. In the illustrated example of FIG. 1, the auxiliary electric heater 16 is connected to the first air passage 80 and the second air passage 90.
Although approximately half of the total height of the auxiliary air heater 16 is located in the first air passage 80 and the second air passage 90,
The setting is made such that a desired upper and lower blow-out temperature difference can be obtained with the air passage 90 side. For example, the installation area ratio of the auxiliary electric heater 16 is set so that the blowout temperature on the first air passage 80 side> the blowout temperature on the second air passage 90 side.

Next, the first air passage 8 in the air conditioning case 11
At 0, a cool air bypass passage 17 is formed below the heater core 13 so that air (cool air) flows through the heater core 13, and the cool air bypass passage 17 is opened by the mac school door 18 during maximum cooling. Further, a defroster opening 19 communicating with the second air passage 90 immediately after the heater core 13 is opened in the upper surface of the air conditioning case 11. The defroster opening 19 is for blowing wind toward the inside of the vehicle window glass through a defroster duct and a defroster outlet (not shown). The defroster opening 19 is opened and closed by a defroster door 20, and the defroster door 20 is connected to a rotating shaft 20a.
To form a freely rotatable butterfly.

A face opening 21 that directly communicates with the first air passage 80 is opened at the most rearmost part (closer to the occupant) of the air conditioning case 11. This face opening 2
Reference numeral 1 is for blowing air toward the occupant's head from a face outlet above the instrument panel through a face duct (not shown). The face opening 21 is opened and closed by a face door 22, and the face door 22 is
2a forms a rotatable butterfly shape.

A communication passage 23 communicating between the first and second air passages 80 and 90 is provided between the most downstream end of the partition plate 15d and the entrance of the face opening 21.
The communication passage 23 is opened and closed by a flat communication door 24 which is rotatable by a rotation shaft 24a. On the lower surface of the air-conditioning case 11, a foot opening 25 is opened at a portion on the vehicle rear side, and the foot opening 25 is formed in the heater core 13 in the first air passage 80.
And a portion of the auxiliary electric heater 16 on the air downstream side. The foot opening 25 is for blowing warm air from a foot outlet to a foot of an occupant in the vehicle cabin through a foot duct (not shown). The foot opening 25 is opened and closed by a foot door 26, and the foot door 26 has a butterfly shape that is rotatable about a rotation shaft 26a.

The defroster door 20, face door 22, and foot door 26 are door means for switching the blowing mode, and are connected to a manual operating mechanism for switching the blowing mode of the air-conditioning operation panel via a link mechanism (not shown), a cable or the like. They are connected and operated in conjunction with each other, or the door means for switching the blowing mode is operated in conjunction with a mode switching actuator mechanism using a servomotor.

The hot water valve 14 and the mac school door 18 are temperature adjusting means, and are connected to a temperature adjusting manual operating mechanism of an air-conditioning operating panel via a link mechanism, a cable, and the like (not shown) to perform an interlocking operation. Or
These temperature adjusting means are operated in conjunction with each other by a temperature adjusting actuator mechanism using a servomotor. Next, the operation of this embodiment in the above configuration will be described for each blowing mode.

(1) Foot blowing mode When the maximum heating state is set, for example, when heating is started in winter, the inside / outside air switching operation mechanism is operated to set the two-layer flow mode. That is, in the blower unit 1, the first inside / outside air switching door 4 opens the first inside air introduction port 2 and closes the outside air passage 3 a from the outside air introduction port 3. Further, the second inside / outside air switching door 5 closes the second inside air introduction port 2a and opens the outside air passage 3b from the outside air introduction port 3.

Accordingly, the first blower fan 6 sucks the inside air from the first inside air inlet 2 through the suction port 6a, and at the same time, the second blower fan 7 draws the outside air from the outside air inlet 3 to the outside air passage. 3b, inhalation is performed via the inlet 7a. The inside air blown by the first blower fan 6 flows through the first air passage 8 and the first air passage 80 of the air conditioning unit 100. Outside air blown by the second blower fan 7 flows through the second air passage 9 and the second air passage 90 of the air conditioning unit 100.

On the other hand, the blowing mode switching operation mechanism is operated, so that the foot door 26 opens the foot opening 25 and the face door 22 closes the face opening 21. The defroster door 20 opens a small amount of the defroster opening 19. Note that even in the two-layer flow mode, for the reasons described below,
The communication door 24 is operated to a position with a small opening that opens the communication passage 23 fully or a small amount.

On the other hand, when heating is started in winter, the hot water valve 14 is fully opened by the temperature adjusting operation mechanism, and the heating state is maximized. Thereby, the maximum flow rate of hot water flows through the heater core 13 and the mac school door 18 closes the cool air bypass 17. After passing through the evaporator 12, the inside air flowing through the first air passage 80 is heated by the heater core 13, becomes warm air, and blows out to the feet of the occupant in the vehicle cabin through the foot opening 25. At the same time, the outside air flowing through the second air passage 90 passes through the evaporator 12, is heated by the heater core 13, becomes warm air, and blows out to the inner surface of the vehicle window glass through the defroster opening 19. in this case,
In the first air passages 8 and 80, the inside air having a higher temperature than the outside air is recirculated and heated by the heater core 13, so that the temperature of the hot air blown out to the feet of the occupant is increased, and the heating effect can be improved. On the other hand, since the outside air having a lower humidity than the inside air is heated and blown out from the defroster opening 19, the fogging of the window glass can be satisfactorily prevented.

In the foot blowing mode, the amount of air blown from the defroster opening 19 is normally set to about 20%, and the amount of air blown from the foot opening 25 is set to about 80%. The above airflow ratio can be achieved by mixing the outside air temperature on the side through the communication passage 23 with a full or small opening into the inside air temperature on the first air passage 80 side.

Next, when the cabin temperature rises and the heating load decreases, the hot water valve 14 is operated from the fully open position (maximum heating state) to the intermediate opening position to control the temperature of the blown air. Reduce the incoming hot water flow. At this time, the communication door 24 is maintained at the position of the full opening or the small opening described above,
Also, the cold air bypass passage 17 remains closed.

In the intermediate temperature control range, since the maximum heating capacity is not required, the inside / outside air suction mode is normally set to the first,
It is preferable to set the whole outside air mode in which both the second inside air inlets 2 and 2a are closed and the outside air inlet 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. Can be set to a two-layer flow of inside / outside air in which air is introduced simultaneously.

In the foot blowing mode, when the temperature of the hot water circulating through the heater core 13 is lower than a predetermined temperature,
When the temperature of the hot water is detected and the auxiliary electric heater 16 is energized by a control circuit (not shown) and the auxiliary electric heater 16 generates heat, the air blown out of the heater core 13 is supplied to both the first and second air passages 80 and 90. Can be heated. Thereby, the shortage of the heating capacity at the time of the low temperature of the hot water and the shortage of the antifogging ability of the window glass can be solved.

Here, the amount of heat generated by the auxiliary electric heater 16 may be increased as the temperature of the hot water decreases. (2) Foot Defroster Blowout Mode In the foot defroster blowout mode, the foot door 26 is used to make the amount of air blown out from the foot opening 25 substantially equal to the amount of air blown out from the defroster opening 19 (by 50%).
, The foot opening 25 is fully opened, and the defroster door 20 is fully opened by the defroster door 20. Then, the communication door 24 is operated to the fully closed position of the communication passage 23.

As a result, the flow of the outside temperature air flowing from the communication passage 23 to the foot opening 25 side is eliminated, so that the entire inside temperature air of the first air passage 80 flows into the foot opening 25 and the defroster The opening 19 has a second air passage 9.
A total outside air temperature of 0 flows in. This makes it possible to make the amount of air blown out of the foot opening 25 and the amount of air blown out of the defroster opening 19 substantially equal.

At the time of maximum heating when the hot water valve 14 is fully opened, a two-layer flow mode of the inside and outside air is set to improve the heating effect and ensure the antifogging property of the window glass. Same as mode. Further, a desired intermediate temperature control is possible by adjusting the opening degree of the hot water valve 14, and in the intermediate temperature control region, the whole outside air mode is usually set. Or an internal / external air two-layer flow mode.

Also in the foot defroster blowing mode, the auxiliary electric heater 16 can function as an auxiliary heating heat source as in the above-described foot blowing mode. By the way, in the above-described foot blowing mode and the foot defroster blowing mode, the heater core 13 is configured as a one-way flow type in which hot water flows from the first air passage 80 toward the second air passage 90. At the hot water outlet side, the temperature of the blown air decreases due to the decrease in the temperature of the hot water. Therefore, the defroster blowing temperature on the side of the second air passage 90 located on the hot water outlet side decreases, and the anti-fog capability of the window glass may be insufficient.

In such a vehicle, the ratio of the installation area of the auxiliary electric heater 16 to the second air passage 90 on the hot water outlet side is increased compared to the installation area ratio of the auxiliary electric heater 16 to the second air passage 90. The amount of heat radiation of the auxiliary electric heater 16 to the heater is increased. As a result, the defroster blowing temperature from the second air passage 90 on the hot water outlet side can be increased to the same level as the foot blowing temperature from the first air passage 80 located on the hot water inlet side, and the anti-fog performance of the window glass can be improved. Can be raised preferentially.

Conversely, of the auxiliary electric heater 16,
The ratio of the installation area to the first air passage 80 is
If it is larger than the installation area ratio to the first air passage 80,
The temperature of the foot blowout from the second air passage 90 can be made sufficiently higher than the temperature of the defroster blowout from the second air passage 90. Therefore,
The heating capacity for the feet of the occupant can be preferentially increased.

Further, utilizing the fact that the defroster outlet temperature on the side of the second air passage 90 located on the hot water outlet side of the heater core 13 is lower than the foot outlet temperature on the side of the first air passage 80 located on the side of the warm water inlet, It is also possible to set a vertical temperature difference between head and foot heat between the defroster outlet temperature and the foot outlet temperature in the outside air mode. (3) Defroster blowing mode In the defroster blowing mode, the face door 22 fully closes the face opening 21 and the foot door 26 fully closes the foot opening 25, respectively. Further, the defroster door 20 fully opens the defroster opening 19, and the communication door 24 fully opens the communication passage 23. Therefore, the first and second air passages 8
The conditioned air from 0 and 90 is blown out only through the inner surface of the window glass through the defroster opening 19 to prevent fogging. At this time, in order to secure the antifogging property of the window glass, the whole outside air suction mode is usually set.

In the defroster blowing mode, the auxiliary electric heater 16 can also serve as an auxiliary heating heat source. (4) Face blowing mode In the face blowing mode, the face door 22 fully opens the face opening 21, the defroster door 20 fully closes the defroster opening 19, and the foot door 26 fully closes the foot opening 25. The communication door 24 is connected to the communication passage 23.
Fully open. Therefore, the downstream portions of the first and second air passages 80 and 90 are both connected to the face opening 21.

For this reason, the cool air cooled by the evaporator 12 is reheated by the heater core 13 and the temperature is adjusted. Also at this time, the inside / outside air suction mode can be selected by the first and second inside / outside air switching doors 4 and 5, any of all inside air, all outside air, and two-layer inside / outside air flow. In the maximum cooling state, the internal air suction mode is set, the hot water valve 14 is fully closed, the circulation of hot water to the heater core 13 is cut off, and the mac school door 18 opens the cold air bypass passage 17, so that the And the cooling capacity can be maximized.
In the face blowing mode, the auxiliary electric heater 16 is not energized.

(5) Bi-level blowing mode In the bi-level blowing mode, the face door 22 fully opens the face opening 21 and the foot door 2
6 fully opens the foot opening 25. Defroster door 20
Completely closes the defroster opening 19. In addition, communication door 2
4 fully opens the communication path 23. Therefore, the face opening 2
1 and the foot opening 25, it is possible to simultaneously blow air from both the upper and lower sides of the cabin.

Here, since the heater core 13 is of a one-way flow type, the temperature of the blow-out air on the side of the first air passage 80 located on the inlet side of the hot water at the outlet side of the heater core 13 is increased, and located on the outlet side of the hot water. The temperature of the blown air on the side of the second air passage 90 can be reduced. Therefore, even in the all outside air mode or the all inside air mode, the first air passage 8
Since the face blowing temperature from the second air passage 90 can be made lower than the foot blowing temperature from 0, the vehicle interior temperature distribution can be made to be in a comfortable state of a head-and-foot hot type.

(Other Embodiments) The present invention can be embodied in various forms without being limited to the above embodiments.
Another embodiment of the present invention will be described. In the above-described embodiment, a case has been described in which the auxiliary electric heater 16 is automatically energized due to a decrease in hot water temperature. However, a heating value adjusting member that is adjusted by an occupant's operation is installed on an air conditioning operation panel in the vehicle cabin. The amount of heat generated by the auxiliary electric heater 16 and ON / OFF of heat generation may be adjusted by manually operating the heat generation amount adjusting member.

In the bi-level blowing mode, the defroster opening 19 may be slightly opened. For example, the ratio of the amount of air blown out from the face opening 21, the foot opening 25, and the defroster opening 19 is, for example,
Each opening 21, 25, 45:40:15
The opening degree of 19 may be set, and the wind may be blown out of all of the openings 21, 25, and 19 at the same time.

The present invention can also be applied to an air conditioner in which the evaporator (cooling heat exchanger) 12 is not provided in the air conditioning unit 100.

[Brief description of the drawings]

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

[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 ...
First and second fans, 8, 80 ... first air passages, 9, 90
... second air passage, 11 ... air conditioning case, 12 ... evaporator, 1
3 ... heater core, 14 ... hot water valve, 16 ... auxiliary electric heater, 19 ... defroster opening, 20 ... defroster door,
21: face opening, 22: face door, 25: foot opening, 26: foot door, 100: air conditioning unit.

Continued on the front page (72) Inventor Hirofumi Sugita 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside DENSO Corporation

Claims (8)

[Claims] 1. An inside / outside air switching means (2, 2a, 3, 4, 5) capable of selecting a two-layer inside / outside air mode in which both of the inside air and outside air are separately sucked in simultaneously as a suction mode of the conditioned air.
A heating heat exchanger (13) for heating the conditioned air drawn through the inside / outside air switching means (2, 2a, 3, 4, 5) using hot water as a heat source; and a heating heat exchanger (13). Opening (25) that blows out the conditioned air that has passed through toward the passenger's feet
A defroster opening (1) for blowing the conditioned air that has passed through the heating heat exchanger (13) toward the inner surface of the vehicle window glass.
9) a first flow of the inside air from the inside / outside air switching means (2, 2a, 3, 4, 5) toward the foot opening (25);
An air passage (8, 80), and a first air passage (8, 80) are defined and formed, and are directed from the inside / outside air switching means (2, 2a, 3, 4, 5) to the defroster opening (19). A second air passage (9, 90) through which the outside air flows, and a second air passage (9, 90) disposed downstream of the heating heat exchanger (13).
An auxiliary heating device (16) for heating the conditioned air, wherein the heating heat exchanger (13) is connected to the first air passage (8,
80) and the second air passage (9, 90), and the auxiliary heating device (16) is connected to the first air passage (8, 8).
0) and the second air passage (9, 90). 2. The heating heat exchanger (13) includes a first air passage (8, 80) and a second air passage (9,
90. The vehicle air conditioner according to claim 1, wherein the air conditioner is configured as a one-way flow type in which hot water flows from any one of the above 90) to the other. 3. The heating heat exchanger (13) is connected to the second air passage (9, 80) from the first air passage (8, 80) side.
The air conditioner for a vehicle according to claim 2, wherein the warm water flows toward the (90) side. 4. A temperature adjusting means (14) for adjusting the temperature of the conditioned air by adjusting the flow rate or temperature of the hot water circulating in the heating heat exchanger (13). The vehicle air conditioner according to any one of 1 to 3. 5. The area of the auxiliary heating device (16) located in the first air passage (8, 80) is larger than the area located in the second air passage (9, 90). The vehicle air conditioner according to any one of claims 1 to 4, wherein: 6. The area of the auxiliary heating device (16) located in the first air passage (8, 80) is made smaller than the area of the auxiliary heating device (16, 80) located in the second air passage (9, 90). The vehicle air conditioner according to any one of claims 1 to 4, wherein: 7. The auxiliary heating device includes an auxiliary electric heater (1).
The vehicle air conditioner according to any one of claims 1 to 6, wherein the air conditioner is configured as described in (6). 8. A vehicle air conditioner according to claim 7, wherein the auxiliary electric heater is energized when the temperature of the hot water circulating in the heating heat exchanger is lower than a predetermined temperature. apparatus.