JP3900592B2 - Air conditioner for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle air conditioner that combines an auxiliary heating device (auxiliary electric heater or the like) in addition to a hot water heating device as an air heating source, and in particular, the air passage inside the air conditioning case is a first air passage on the inside air side. And the second air passage on the outside air side so as to recirculate and blow out the heated high-temperature inside air from the foot opening, while blowing out low-humidity outside air from the defroster opening. The present invention relates to a vehicle air conditioner capable of setting a two-layer flow mode.
[0002]
[Prior art]
Conventionally, a vehicular air conditioner capable of setting this kind of inside / outside air two-layer flow mode is known from Japanese Patent Application Laid-Open No. 5-124426, etc. An outline of this prior art will be described. The inside air inlet and the outside air inlet are formed, and a foot opening, a defroster opening, and a face opening are formed on the other end side.
[0003]
A partition that partitions the first air passage from the inside air inlet to the face opening and the foot opening and the second air passage from the outside air inlet to the defroster opening in the air conditioning case. A plate is provided.
Further, in each of the air passages, a heating heat exchanger, a bypass passage that bypasses the heating heat exchanger, and an air mix door are provided.
[0004]
And when any 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 circulation mode, the inside air is introduced into the both air passages, In the outside air introduction mode, outside air is introduced into both the air passages. Further, when the defroster mode is selected as the blowing mode, outside air is introduced into both the air passages.
[0005]
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 already warmed inside air can be recirculated and blown out from the foot opening to heat the vehicle interior, so that the temperature of the air blown into the vehicle interior becomes high and the heating performance can be improved. At the same time, since low humidity outside air is blown out from the opening of the defroster to the window glass, the anti-fogging performance of the window glass can be ensured.
[0006]
[Problems to be solved by the invention]
By the way, in recent years, the temperature of hot water (engine cooling water), which is a heat source for vehicle heating, tends to decrease due to the high efficiency of the vehicle engine, and it is a big problem that the heating capacity is insufficient due to the decrease in the hot water temperature. ing. However, the conventional technology described above may not be able to sufficiently cope with such a lack of heating capacity.
[0007]
Therefore, in view of the above points, the present invention has an object to solve the shortage of heating capacity by adding an auxiliary heating heat source in a vehicle air conditioner capable of setting an inside / outside air two-layer flow mode.
Further, according to the present invention, in this type of inside / outside air two-layer flow type vehicle air conditioner, the difference in temperature of the blown air between the inside air side passage and the outside air side passage can be set to a desired value depending on the installation form of the auxiliary heating heat source. The purpose is to do so.
[0008]
[Means for Solving the Problems]
Focusing on the auxiliary heating device (auxiliary electric heater, etc.) used when the hot water temperature is low during heating in winter, the present invention intends to achieve the above object by devising the installation form of this auxiliary heating device. It is.
That is, in the invention according to claims 1 to 8, the heating heat exchanger (13) of the hot water heat source is divided into the first air passage (8, 80) on the inside air side and the second air passage (9, 90) on the outside air side. And placed across both,
On the air downstream side of the heating heat exchanger (13) of the hot water heat source, the auxiliary heating device (16) 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. It is characterized by being arranged across both.
[0009]
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, 5) is used to change the inside / outside air two-layer flow mode. When selected, the inside air is heated by the heating heat exchanger (13) through the first air passage (8, 80) and then blown out from the foot opening (25), and the outside air is blown out from the second air passage (9, 90) through the defroster opening (19) after heating in the heating heat exchanger (13).
[0010]
In addition, at that time, both the inside air of the first air passage (8, 80) and the outside air of the second air passage (9, 90) can be heated by heat radiation from the auxiliary heating device (16), so that the hot water temperature is low In addition, the heating capacity and the anti-fogging performance of the window glass can be effectively improved.
Furthermore, by arranging the auxiliary heating device (16) across both the first air passage (8, 80) on the inside air side and the second air passage (9, 90) on the outside air side, In both the all outside air mode and all the inside air modes other than the two-layer flow mode, the heating capacity and the defogging performance of the window glass can be improved by the heat radiation from the auxiliary heating device (16), and the auxiliary heating device (16) By selecting the installation area for the first and second air passages, the difference in temperature of the blown air between the first and second air passages can be easily set to a desired value.
[0011]
For example, as in the invention described in claim 5, the area of the auxiliary heating device (16) located in the first air passage (8, 80) is located in the second air passage (9, 90). If it is larger than the area, the heat radiation amount into the first air passage (8, 80) of the auxiliary heating device (16) can be made larger than the heat radiation amount into the second air passage (9, 90).
[0012]
Since the temperature of the inside air flowing in the first air passage (8, 80) is originally higher than the temperature of the outside air flowing in the second air passage (9, 90), the difference in the heat radiation amount is added to the first air passage. The blowing temperature (foot blowing temperature) of the inside air flowing through the air passage can be made sufficiently higher than the blowing temperature (defroster blowing temperature) of the outside air flowing through the second air passage. Therefore, it is possible to preferentially increase the heating capacity to the passenger foot.
[0013]
On the contrary, as in the invention described in claim 6, the area located in the first air passage (8, 80) in the auxiliary heating device (16) is set in the second air passage (9, 90). If it is made smaller than the area located in the area, the heat radiation amount into the second air passage (9, 90) is made larger than the heat radiation amount into the first air passage (8, 80) of the auxiliary heating device (16). Can do.
[0014]
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 blown air temperature of both the first and second air passages is set to the same temperature, and the blown air temperature difference Can be eliminated. Therefore, the blowing temperature (defroster blowing temperature) of the outside air can be increased to preferentially enhance the defogging performance of the window glass.
According to the second aspect of the present invention, the heating heat exchanger (13) of the hot water heat source is directed from one of the first air passage (8, 80) and the second air passage (9, 90) to the other. It is configured as a one-way flow type in which hot water flows.
[0015]
According to this, since the heating heat exchanger (13) is of a unidirectional flow (all paths) type, the hot water flow path has a low pressure loss and the width direction of the heating heat exchanger (13) (tube) There is an advantage that there is no difference in the blowing temperature in the arrangement direction). On the other hand, since the warm water flow direction of the heat exchanger for heating (13) is one direction, the temperature of the blown air decreases due to the decrease of the warm water temperature on the warm water outlet side. If the installation area ratio of the auxiliary heating device (16) is increased, a decrease in the temperature of the blown air at the hot water outlet side can be offset by the amount of heat released from the auxiliary heating device (16).
[0016]
Further, as in the invention described in claim 3, the hot water flows through the heating heat exchanger (13) from the first air passage (8, 80) side toward the second air passage (9, 90) side. If it comprises, in the blowing side of the heat exchanger for heating (13), the blowing air temperature by the side of the 1st air passage (8, 80) is made high, and the blowing air temperature by the side of the 2nd air passage (9, 90) Can be lowered.
[0017]
Accordingly, in the all-outside air mode, the defroster blowing temperature from the second air passage (9, 90) can be made lower than the foot blowing temperature from the first air passage (8, 80). It is possible to achieve a comfortable state of the head cold foot heat form. Similarly, in the bi-level mode with all outside air or all inside air, the conditioned air from the first air passage (8, 80) is blown out from the foot opening (25) and from the second air passage (9, 90). By blowing out the conditioned air from the face opening (21), the temperature distribution in the passenger compartment can be brought to a comfortable state of head-and-head heat.
[0018]
As in the invention described in claim 7, the auxiliary heating device can be constituted by an auxiliary electric heater (16).
In addition, the code | symbol in the parenthesis attached | subjected to each said means shows the correspondence with the specific means of embodiment description later mentioned.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 shows an embodiment of the present invention, which is applied to a low heat source vehicle in which hot water (engine cooling water) temperature is relatively low like a diesel engine vehicle.
The air conditioning system ventilation system is roughly divided into two parts, a blower unit 1 and an air conditioning unit 100. The air conditioning unit 100 part is arranged at a substantially central part in the left-right direction of the vehicle in the lower part of the instrument panel in the passenger compartment. On the other hand, the blower unit 1 in the illustrated form of FIG. The state arrange | positioned in the side is shown in figure. That is, the air conditioning unit 100 is arranged in the vehicle compartment, and the blower unit 1 is arranged in a position in front of the air conditioning unit 100 in the engine room.
[0020]
Here, it is also possible to adopt a layout in which the blower unit 1 is offset from the side of the air conditioning unit 100 (passenger seat side) in the passenger compartment.
First, a part of the blower unit 1 will be described in detail. First and second inside air inlets 2 and 2a for introducing inside air (vehicle compartment air) into the blower unit 1 and outside air (outside the vehicle compartment). One external air inlet 3 for introducing air) is provided. These inlets 2, 2 a and 3 can be opened and closed by first and second inside / outside air switching doors 4 and 5, respectively.
[0021]
Both the inside / outside air switching doors 4 and 5 are plate-like ones that are rotated around the rotation shafts 4a and 5a, respectively, and are connected to an air conditioning operation panel (not shown) via a link mechanism, a cable, etc. (not shown). The internal / external air switching manual operation mechanism (mechanism using levers and dials) is operated in conjunction with each other, or both the internal / external air switching doors 4 and 5 are actuator mechanisms using a servo motor. Interlock operation with.
[0022]
In this example, the inside / outside air switching means is constituted by the inside 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 actuator mechanism.
A first (inside air side) fan 6 and a second (outside air side) fan 7 for blowing the introduced air from the introduction ports 2, 2 a, 3 are arranged in the blower unit 1. Both the fans 6 and 7 are well-known centrifugal multiblade fans (sirocco fans), and are simultaneously driven to rotate by one common electric motor 7b.
[0023]
FIG. 1 shows a state of a two-layer flow mode to be described later, and 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. Inside air is sucked into the inlet 6 a of the first (inside air side) fan 6. On the other hand, since 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, the suction port 7a of the second (outside air side) fan 7 is opened. Outside air is inhaled.
[0024]
Therefore, in this state, the first fan 6 blows the inside air from the inside air introduction port 2 to the first air passage (inside air side passage) 8, and the second fan 7 draws the outside air from the outside air introduction port 3 to the second air. An air passage (outside air side passage) 9 is blown, and the first and second air passages 8 and 9 are partitioned by a partition plate 10 disposed between the first fan 6 and the second fan 7. It has been. The partition plate 10 can be integrally formed with a resin scroll casing 10 a that houses the fans 6 and 7.
[0025]
In the present embodiment, the outer diameter of the first fan 6 is reduced and the outer diameter of the second fan 7 is increased. This is to prevent the opening area of the suction port 7a from being reduced due to the presence of the electric motor 7b on the second fan 7 side.
Next, 100 parts of the air conditioning unit is of a type in which both an evaporator (cooling heat exchanger) 12 and a heater core (heating heat exchanger) 13 are integrally incorporated in the air conditioning case 11. The air conditioning case 11 is made of a resin molded product having a certain degree of elasticity and excellent strength, such as polypropylene, and a plurality of divided cases having a dividing surface in the vertical direction (vehicle vertical direction) in FIG. . By housing the heat exchangers 12 and 13 and devices such as doors, which will be described later, in the plurality of divided cases, by joining the plurality of divided cases together by fastening means such as metal spring clips and screws, 100 parts of the air conditioning unit are assembled.
[0026]
In the air conditioning case 11, the evaporator 12 is installed at the most front portion of the vehicle, and the evaporator 12 is disposed so as to cross the entire area of the first and second air passages 80 and 90 in the air conditioning case 11. As is well known, this evaporator 12 absorbs the latent heat of evaporation of the refrigerant in the refrigeration cycle from the conditioned air and cools the conditioned air. Here, as shown in FIG. 1, the evaporator 12 is installed in the air conditioning case 11 in a thin shape in the vehicle front-rear direction.
[0027]
Further, the air passage inside the air conditioning case 11 extends from the upstream portion of the evaporator 12 to the downstream portion of the heater core 13 by a partition plate 15a, 15b, 15c, 15d on the vehicle lower side first air passage (inside air passage). 80 and a second air passage (outside air passage) 90 on the vehicle upper side. The partition plates 15a to 15d are fixed partition members that are integrally formed with the air conditioning case 11 with resin and extend substantially horizontally in the vehicle left-right direction.
[0028]
Note that the evaporator 12 is a well-known laminated type, and a large number of flat tubes formed by laminating two metal thin plates such as aluminum in the middle are laminated and corrugated with corrugated fins. Is. Since the inside of the evaporator 12 can partition the air passage on the extension line of the end portions of the partition plates 15a and 15b by the flat surface of the corrugated fin or the flat surface of the flat tube, the first air passage 80 and the inside of the evaporator 12 can be separated. The second air passage 90 can be partitioned.
[0029]
The heater core 13 is arranged adjacent to the downstream side of the air flow (the vehicle rear side) of the evaporator 12 at a predetermined interval. The heater core 13 reheats the cold air that has passed through the evaporator 12, and hot engine cooling water (hot water) flows through the heater core 13 to heat the air using the cooling water as a heat source. Similar to the evaporator 12, the heater core 13 is also installed in the air conditioning case 11 in a thin shape in the vehicle longitudinal direction. More specifically, the heater core 13 is disposed across both the first air passage 80 and the second air passage 90 between the partition plates 15b and 15c. Moreover, a portion of the heater core 13 on the second air passage 90 side is installed so as to cross the entire area of the second air passage 90, while a portion of the heater core 13 on the first air passage 80 side is the first air passage 90 side. A cold air bypass passage 17 (described later) is installed at the lowermost portion of the air passage 80.
[0030]
The heater core 13 is well-known, and is formed by laminating a large number of flat tubes formed by joining thin metal plates such as aluminum in a cross-sectional flat shape by welding or the like with corrugated fins and integrally brazing them. . The inside of the heater core 13 can partition the air passage on the extension line of the end portions of the partition plates 15b and 15c by the flat surface of the corrugated fin or the flat surface of the flat tube. The two air passages 90 can be partitioned.
[0031]
In the heater core 13 of this example, 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 side. And between these tanks 13a and 13b, the heat exchange core part 13c which consists of the said flat tube and a corrugated fin is comprised. 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 the flat tube of the heat exchange core portion 13c.
[0032]
And the hot water valve 14 which adjusts the flow volume (or temperature of warm water) which flows into the heater core 13 is provided, and the temperature of the air blown into the passenger compartment is adjusted by the adjustment of the warm water flow rate (or warm water temperature) of the warm water valve 14. It can be adjusted. That is, in this example, the hot water valve 14 constitutes a temperature adjusting means for adjusting the temperature of the air blown into the vehicle interior.
[0033]
An auxiliary electric heater 16 is disposed at a position immediately after the air downstream side of the heater core 13. The auxiliary electric heater 16 is disposed across both the first air passage 80 and the second air passage 90 between the partition plates 15c and 15d. Further, the auxiliary electric heater 16 is disposed over the entire length in the width direction of the first air passage 80 and the second air passage 90 in the direction perpendicular to the sheet of FIG.
[0034]
The auxiliary electric heater 16 is used when the hot water temperature is not higher than a predetermined temperature (for example, 75 ° C.) (when the hot water temperature is low, such as immediately after starting the engine, or when the hot water temperature does not rise sufficiently even after the engine warm-up is finished). In addition, it is an auxiliary heating device for heating air-conditioned air quickly and effectively by its heat generation 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.
[0035]
Specifically, the auxiliary electric heater 16 is formed by forming a PTC heater made of a ceramic material such as barium titanate into a honeycomb shape having a large number of holes for air passage.
In the illustrated example of FIG. 1, approximately half of the total height of the auxiliary electric heater 16 is positioned with respect to the first air passage 80 and the second air passage 90. The installation area ratio of the auxiliary electric heater 16 to the passage 90 is set so that a desired upper and lower blowing temperature difference is obtained between the first air passage 80 side and the second air passage 90 side. For example, the installation area ratio of the auxiliary electric heater 16 is set so that the blowing temperature on the first air passage 80 side> the blowing temperature on the second air passage 90 side.
[0036]
Next, in the first air passage 80 in the air conditioning case 11, a cold air bypass passage 17 that bypasses the heater core 13 and flows air (cold air) is formed on the lower side of the heater core 13. It is opened by the max cool door 18 during cooling.
Further, a defroster opening 19 communicating with the second air passage 90 immediately after the heater core 13 is opened on the upper surface of the air conditioning case 11. The defroster opening 19 is for blowing wind toward the inner surface of the vehicle window glass via 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 has a butterfly shape that is rotatable by a rotating shaft 20a.
[0037]
A face opening portion 21 that directly communicates with the first air passage 80 is opened at a portion of the air conditioning case 11 closest to the vehicle rear side (close to the passenger). The face opening 21 is for blowing air from a face outlet at the upper part of the instrument panel toward the passenger's head through a face duct (not shown). The face opening 21 is opened and closed by a face door 22, and the face door 22 has a butterfly shape that can be rotated by a rotating shaft 22a.
[0038]
A communication passage 23 that communicates between the first and second air passages 80 and 90 is provided between the most downstream end portion of the partition plate 15 d and the inlet portion of the face opening 21. The communication path 23 is opened and closed by a flat communication door 24 that is rotatable by a rotating shaft 24a.
In addition, a foot opening 25 is opened at the rear side of the air conditioning case 11 at the rear side of the vehicle. The foot opening 25 is on the air downstream side of the heater core 13 and the auxiliary electric heater 16 in the first air passage 80. It communicates with the part of. The foot opening 25 is for blowing warm air from a foot outlet through a foot duct (not shown) to the feet of passengers in the passenger compartment. The foot opening 25 is opened and closed by a foot door 26. The foot door 26 has a butterfly shape that can be rotated by a rotating shaft 26a.
[0039]
The defroster door 20, the face door 22, and the foot door 26 are door means for blowing mode switching, and are connected to the blowing mode switching manual operation mechanism of the air conditioning operation panel via a link mechanism, a cable, etc. (not shown). The door unit for switching the blowing mode is operated in conjunction with the mode switching actuator mechanism using a servo motor.
[0040]
Further, the hot water valve 14 and the max cool door 18 are temperature adjusting means, and are linked to a temperature adjusting manual operation mechanism of the air conditioning operation panel via a link mechanism, a cable, etc. (not shown), or operated in conjunction with each other, or These temperature adjusting means are operated in conjunction by a temperature adjusting actuator mechanism using a servo motor.
Next, the operation of the present embodiment in the above configuration will be described for each blowing mode.
[0041]
(1) Foot blow mode When setting the maximum heating state as in the heating start in winter, the operation mechanism for switching between the inside and outside air 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 2 a and opens the outside air passage 3 b from the outside air introduction port 3.
[0042]
As a result, the first blower fan 6 sucks the inside air from the first inside air introduction port 2 through the suction port 6a, and at the same time, the second blower fan 7 sucks the outside air from the outside air introduction port 3 to the outside air passage 3b. Inhale through mouth 7a. The inside air blown by the first blower fan 6 flows through the first air passage 80 of the air conditioning unit 100 through the first air passage 8. In addition, the outside air blown by the second blower fan 7 flows through the second air passage 90 of the air conditioning unit 100 through the second air passage 9.
[0043]
On the other hand, the blowing mode switching operation mechanism is operated, 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. Even in the two-layer flow mode, the communication door 24 is operated to a position of a small opening degree that opens the communication passage 23 fully or for a small amount for reasons described later.
[0044]
On the other hand, at the start of heating in winter, the warm water valve 14 is fully opened by the temperature adjusting operation mechanism, and the maximum heating state is reached. As a result, the maximum flow of hot water flows through the heater core 13, and the max cool door 18 closes the cold air bypass 17.
Then, 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 passenger's feet in the passenger compartment 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, on the first air passages 8 and 80 side, the high-temperature inside air is recirculated and heated by the heater core 13 as compared with the outside air, so that the temperature of the hot air blown out to the occupant's feet becomes high and the heating effect is increased. It can be improved. On the other hand, since the outside air having a low humidity is heated and blown out from the defroster opening 19 as compared with the inside air, the window glass can be well-fogged.
[0045]
In the foot blowing mode, normally, the blown air volume from the defroster opening 19 is set to about 20%, and the blown air volume from the foot opening 25 is set to about 80%. The air volume ratio can be achieved by mixing the temperature air into the internal air temperature air on the first air passage 80 side through the fully open or small opening communication passage 23.
[0046]
Next, when the passenger compartment 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 blown air temperature, and the hot water flowing into the heater core 13 is controlled. Reduce the flow rate. At this time, the communication door 24 remains maintained at the fully opened or small opening position, and the max cool door 18 also keeps the cold air bypass passage 17 closed.
[0047]
Since the maximum heating capacity is not required in the intermediate temperature control region, the inside / outside air intake mode is normally an all outside air mode in which both the first and second inside air introduction ports 2 and 2a are closed and the outside air introduction port 3 is opened. It is good to set to. However, by setting by the occupant's manual operation, the outside air introduction port 3 is closed and the first and second inside air introduction ports 2 and 2a are both opened. It is also possible to adopt a two-layer flow mode in which the inside and outside air are introduced simultaneously.
[0048]
In this foot blowing mode, when the temperature of the hot water circulating through the heater core 13 is below a predetermined temperature, 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 from the heater core 13 can be heated in both the first and second air passages 80 and 90. Thereby, the lack of heating capacity at the time of low temperature of hot water and the lack of anti-fogging ability of the window glass can be solved.
[0049]
Here, you may make it increase the emitted-heat amount of the auxiliary | assistant electric heater 16 according to the fall of warm water temperature.
(2) Foot defroster blowing mode In the foot defroster blowing mode, the foot door 26 opens the foot opening portion in order to make the blowing air amount from the foot opening portion 25 and the blowing air amount from the defroster opening portion 19 approximately equal (by 50%). The defroster opening 19 is fully opened by the defroster door 20. Then, the communication door 24 is operated to the fully closed position of the communication path 23.
[0050]
As a result, the flow of the outside air temperature flowing from the communication passage 23 toward the foot opening 25 is eliminated, so that the entire amount of the inside air temperature in the first air passage 80 flows into the foot opening 25 and the defroster opening 19 The entire amount of the outside air temperature in the second air passage 90 flows into the air. As a result, the amount of air blown from the foot opening 25 and the amount of air blown from the defroster opening 19 can be made substantially equal.
[0051]
At the time of maximum heating when the hot water valve 14 is fully opened, the two-layer flow mode of the inside and outside air is set, and it is the same as the foot blowing mode that the heating effect can be improved and the anti-fogging property of the window glass can be ensured. It is. Further, the 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 all outside air mode is usually set, but the all inside air mode is set by the manual operation of the occupant. Or an internal / external air two-layer flow mode.
[0052]
Further, also in the foot defroster blowing mode, the auxiliary electric heater 16 can serve as an auxiliary heating heat source as in the above-described foot blowing mode.
By the way, in the foot blowing mode and the foot defroster blowing mode described above, the heater core 13 is configured as a one-way flow type in which hot water flows from the first air passage 80 side toward the second air passage 90 side. On the hot water outlet side, the temperature of the blown air decreases due to the decrease of the hot water temperature. Therefore, the defroster blowing temperature on the second air passage 90 side located on the hot water outlet side is lowered, and the window glass may have insufficient anti-fogging ability.
[0053]
In such a vehicle, the installation area ratio of the auxiliary electric heater 16 to the second air passage 90 on the hot water outlet side is increased more than the installation area ratio to the first air passage 80 to assist the second air passage 90. The heat radiation amount of the electric heater 16 is increased. Thereby, 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-fogging performance of the window glass can be improved. Priority can be increased.
[0054]
On the contrary, if the installation area ratio of the auxiliary electric heater 16 to the first air passage 80 is larger than the installation area ratio of the second air passage 90, the foot blowing temperature from the first air passage 80 is set to the first temperature. The defroster blowing temperature from the two air passages 90 can be made sufficiently higher. Therefore, it is possible to preferentially increase the heating capacity to the passenger foot.
[0055]
Further, by utilizing the fact that the defroster blowing temperature on the second air passage 90 side located on the warm water outlet side of the heater core 13 is lower than the foot blowing temperature on the first air passage 80 side located on the warm water inlet side, It is also possible to set the upper and lower temperature difference of head cold foot heat between the defroster blowing temperature and the foot blowing temperature.
(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. Further, the defroster door 20 fully opens the defroster opening 19, and the communication door 24 fully opens the communication path 23. Therefore, the conditioned air from the first and second air passages 80 and 90 is blown out only to the inner surface of the window glass through the defroster opening 19 to prevent fogging. At this time, in order to ensure the anti-fogging property of the window glass, the whole outside air suction mode is usually set.
[0056]
Further, even in the defroster blowing mode, the auxiliary electric heater 16 can 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 fully opens the communication path 23. Accordingly, the downstream portions of the first and second air passages 80 and 90 both communicate with the face opening 21.
[0057]
Therefore, after the cold air cooled by the evaporator 12 is reheated by the heater core 13 and the temperature is adjusted, all the air is blown out to the face opening 21 side.
At this time, the inside / outside air intake mode can be selected from the whole inside air, the whole outside air, and the inside / outside air two-layer flow by the first and second inside / outside air switching doors 4 and 5.
In the maximum cooling state, the mode is the all-air intake mode, the hot water valve 14 is fully closed, the hot water circulation to the heater core 13 is blocked, and the max cool door 18 opens the cold air bypass passage 17. The air flow rate can be increased, and the cooling capacity is maximized. Further, in the face blowing mode, the auxiliary electric heater 16 is not energized.
[0058]
(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 26 fully opens the foot opening 25. The defroster door 20 fully closes the defroster opening 19. The communication door 24 fully opens the communication path 23. Therefore, the wind can be blown out from both the upper and lower sides of the passenger compartment through the face opening 21 and the foot opening 25 at the same time.
[0059]
Here, since the heater core 13 is a one-way flow type, on the outlet side of the heater core 13, the outlet air temperature on the first air passage 80 side located on the hot water inlet side is increased, and the second air located on the hot water outlet side. The temperature of the blown air on the side of the passage 90 can be lowered.
Accordingly, even in the all outside air mode or the all inside air mode, the face blowing temperature from the second air passage 90 can be made lower than the foot blowing temperature from the first air passage 80, so that the vehicle interior temperature distribution Can be made into a comfortable state of a head cold foot heat form.
[0060]
(Other embodiments)
The present invention is not limited to the above-described embodiment, and the present invention can be implemented in various forms. Other embodiments of the present invention will be described below.
(1) In the above embodiment, the case where the auxiliary electric heater 16 is automatically energized due to the decrease in the hot water temperature has been described. However, the heat generation amount adjusting member adjusted by the occupant's operation on the air conditioning operation panel in the passenger compartment And the heat generation amount of the auxiliary electric heater 16 and ON / OFF of the heat generation can be adjusted by manual operation of the heat generation amount adjustment member.
[0061]
(2) In the bi-level blowing mode, the defroster opening 19 may be opened slightly. For example, the opening degree of each opening part 21, 25, 19 is set so that the ratio of the blowing air volume from the face opening part 21, the foot opening part 25, and the defroster opening part 19 is 45:40:15, for example. And you may make it blow off wind from all the opening parts 21, 25, and 19 simultaneously.
[0062]
(3) The present invention can also be applied to a type of 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 ... first and second inside / outside air switching doors, 6, 7 ... first and second fans,
8, 80 ... 1st air passage, 9, 90 ... 2nd air passage, 11 ... Air-conditioning case,
12 ... Evaporator, 13 ... 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.

Claims (8)

An inside / outside air switching means (2, 2a, 3, 4, 5) capable of selecting an inside / outside air two-layer flow mode in which both inside and outside air are classified and sucked at the same time as the conditioned air suction mode;
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;
A foot opening (25) that blows out the conditioned air that has passed through the heating heat exchanger (13) toward the feet of the passengers in the vehicle interior;
A defroster opening (19) for blowing out the conditioned air that has passed through the heat exchanger for heating (13) toward the inner surface of the vehicle window glass;
A first air passage (8, 80) through which the inside air flows from the inside / outside air switching means (2, 2a, 3, 4, 5) toward the foot opening (25);
A second air passage that is partitioned from the first air passage (8, 80) and through which the outside air flows from the inside / outside air switching means (2, 2a, 3, 4, 5) toward the defroster opening (19). (9, 90),
An auxiliary heating device (16) that is disposed on the air downstream side of the heating heat exchanger (13) and heats the conditioned air,
The heating heat exchanger (13) is disposed across both the first air passage (8, 80) and the second air passage (9, 90), and
The vehicle air conditioner characterized in that the auxiliary heating device (16) is disposed across both the first air passage (8, 80) and the second air passage (9, 90). The heating heat exchanger (13) is configured as a one-way flow type in which warm water flows from one of the first air passage (8, 80) and the second air passage (9, 90) to the other. The vehicle air conditioner according to claim 1, wherein the vehicle air conditioner is provided. The heating heat exchanger (13) is configured such that warm water flows from the first air passage (8, 80) side toward the second air passage (9, 90) side. The vehicle air conditioner according to claim 2. The 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) is provided. The vehicle air conditioner according to claim 1. Of the auxiliary heating device (16), an area located in the first air passage (8, 80) is made larger than an area located in the second air passage (9, 90). The vehicle air conditioner according to any one of claims 1 to 4. Of the auxiliary heating device (16), an area located in the first air passage (8, 80) is smaller than an area located in the second air passage (9, 90). The vehicle air conditioner according to any one of claims 1 to 4. The vehicular air conditioner according to any one of claims 1 to 6, wherein the auxiliary heating device includes an auxiliary electric heater (16). The vehicle air conditioner according to claim 7, wherein the auxiliary electric heater (16) is energized when the temperature of the hot water circulating through the heating heat exchanger (13) is equal to or lower than a predetermined temperature.

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