JP2001310612A - Air conditioning unit for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning unit for a vehicle capable of being compatible with increase in air volume and reduction of noise at the time of a full mode such as a full cool mode, a full hot mode and an air mix mode by reducing air-flow resistance of a heat exchanger for cooling. SOLUTION: A cool air passage 31 wherein air from an air blower 2 detours around a heat exchanger 7 for heating and flows through the heat exchanger 6 for cooling, a hot air passage 34 wherein air detours around the heat exchanger 6 for cooling and flows through the heat exchanger 7 for heating, and an air mix door 24 for adjusting the ratio of the volume of air between the volume of air which passes through the cool air passage 31 and the volume of air which passes through the hot air passage 34 are provided inside a unit case 3. In the cool air passage 31, a cool air introducing part 31a for introducing air to the heat exchanger 6 for cooling is provided. In the heat exchanger 6 for cooling, an air-inflow surface is arranged so as to surround the cool air introducing part 31a. This arrangement can expand area of the air-inflow surface and reduce the air-flow resistance of the heating exchanger 6 for cooling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning unit for a vehicle mainly used in an automobile.

[0002]

2. Description of the Related Art FIG. 14 is a sectional view showing an example of a conventional product. The air conditioning unit a shown in FIG.
No. 268,040, the air from the blower b bypasses the heating heat exchanger c and passes through the cooling heat exchanger d, the cool air passage e, and the air from the blower b cools. And a hot air passage f flowing around the heating heat exchanger c while bypassing the heating heat exchanger d. Further, an air mixing door g is provided for adjusting the ratio of the amount of air blown through the cool air passage e to the amount of air blown through the warm air passage f.

[0003] In the air conditioning unit a, in the full cool mode, the whole amount of air flows through only the cooling heat exchanger d. In the full hot mode, the entire amount of air flows through only the heating heat exchanger c. In the air mix mode, the air blown through the cooling heat exchanger d and the air blown through the heating heat exchanger c are mixed in the air mix chamber h. In FIG. 14, reference numeral d1 indicates a blast inflow surface of the cooling heat exchanger d, and reference numeral e1 indicates a cool air introducing portion of a cool air passage e that guides air to the cooling heat exchanger d.

FIG. 15 is a sectional view schematically showing another example of a conventional product. The air conditioning unit A shown in FIG.
The blast passing through the cooling heat exchanger B flows through the heating heat exchanger C, and the blast passing through the cooling heat exchanger B bypasses the heating heat exchanger C. And a bypass passage E. In addition, an air mixing door F is provided for adjusting the air volume ratio between the air volume passing through the hot air passage D and the air volume passing through the bypass passage E.

[0005] In the air conditioning unit A, in the full cool mode, the entire amount of air flows through only the cooling heat exchanger B. In the full hot mode, the whole amount of air flows through both the heat exchangers B and C for cooling and heating. In the air mix mode, the air blown through the cooling heat exchanger B and the air blown through the heat exchangers B and C are mixed in the air mix chamber G.

[0006]

When the air conditioning unit a and the air conditioning unit A are compared, in the full hot mode, in the air conditioning unit a, the whole amount of air blows only through the heating heat exchanger c. , Air conditioning unit A
In, the whole amount of air passes through both the heat exchangers B and C for cooling and heating. At the time of the air mix mode, in the air conditioning unit a, a part of the blast passes only through the cooling heat exchanger d,
The rest passes only through the heat exchanger c for heating, whereas in the air conditioning unit A, part of the air passes through only the heat exchanger B for cooling, and the rest passes through both heat exchangers B and C.

Therefore, in the air conditioning unit a, the air flow resistance in the full hot mode and the air mixing mode is smaller than that of the air conditioning unit A, and the air volume is increased and the noise is reduced in the full hot mode and the air mixing mode. Can be achieved. However, at the time of the full cool mode, the air conditioning unit a, like the air conditioning unit A,
The entire amount of air flows through only the cooling heat exchanger d. Therefore, even in the case of the air conditioning unit a, the ventilation resistance in the full cool mode is equivalent to that of the air conditioning unit A,
In all modes of the full cool mode, the full hot mode, and the air mix mode, it is impossible to achieve both an increase in the air volume and a reduction in noise.

Therefore, according to the present invention, the ventilation resistance of the cooling heat exchanger can be made smaller than that of the conventional product shown in FIG. 14, and as a result, the total heat resistance in the full cool mode, the full hot mode, and the air mix mode can be reduced. It is an object of the present invention to provide an air conditioning unit for a vehicle that can achieve both an increase in air volume and a reduction in noise in a mode.

[0009]

According to the first aspect of the present invention,
Blowers from the blower bypass the heating heat exchanger and flow through the cooling heat exchanger, and blowers from the blower bypass the cooling heat exchanger and flow through the heating heat exchanger. In an air conditioning unit for a vehicle including a hot air passage and an air mixing door that adjusts an air flow ratio between an air flow amount passing through the cold air passage and an air flow amount passing through the hot air passage, the cold air passage is configured to blow air. It is provided with a cool air introduction part which leads to a heat exchanger for cooling, and the heat exchanger for cooling is characterized by being arranged so that a blast inflow surface into which air flows in may surround the cool air introduction part.

According to a second aspect of the present invention, there is provided an air conditioning unit for a vehicle according to the first aspect, wherein the heating heat exchanger comprises:
The cool air introduction unit is disposed downstream of the cooling heat exchanger with respect to the cooling air, and the cold air introduction unit also serves as a hot air introduction unit of a hot air passage that guides air to the heating heat exchanger.

According to a third aspect of the present invention, there is provided the air conditioning unit for a vehicle according to the first or second aspect, wherein the temperature of the hot air passage that guides the air bypassing the cooling heat exchanger to the heating heat exchanger. A dehumidifying and heating passage that guides air that has passed through the cooling heat exchanger to the heating heat exchanger, and a dehumidifying and heating passage that opens at least in the full hot mode and closes the hot air introduction unit as needed at least in the full hot mode. It is characterized by having a heating door.

[0012]

According to the first aspect of the present invention, the cool air passage has a cool air introducing portion for guiding the blow air to the cooling heat exchanger, and the cooling heat exchanger has a blow air inflow surface into which the blow air flows. Since the cooling heat exchanger is arranged so as to surround the introduction part, the cooling heat exchanger is arranged so as to intersect the cold air introduction part in FIG.
Compared with the conventional product shown in the figure, the area of the airflow inflow surface of the cooling heat exchanger can be enlarged to reduce the amount of airflow per unit area of the airflow inflow surface. Therefore, the ventilation resistance of the cooling heat exchanger can be made smaller than that of the conventional product shown in FIG. 14, and as a result, the air volume increases in all modes of the full cool mode, the full hot mode, and the air mix mode. And low noise can be achieved at the same time.

In addition, since the cooling heat exchanger is arranged so that the air blowing inflow surface surrounds the cold air introducing portion,
The cooling heat exchanger can be arranged compactly while increasing the area of the blast inflow surface of the cooling heat exchanger, and both the expansion of the blast inflow area of the cooling heat exchanger and the downsizing of the air conditioning unit can be achieved. You can also plan.

According to the second aspect of the present invention, the heating heat exchanger is arranged on the downstream side of the cooling heat exchanger of the cold air introducing section, and the cold air introducing section directs the blowing air to the heating heat exchanger. Since the hot air passage also serves as the hot air introduction portion of the hot air passage, the cold air passage and the hot air passage can be partially shared and formed, and the air conditioning unit can be further reduced in size.

According to the third aspect of the present invention, in the full hot mode, the dehumidifying / heating passage for guiding the air passing through the cooling heat exchanger to the heating heat exchanger is opened as required,
It is possible to close the hot air inlet of the hot air passage that guides the air that bypasses the cooling heat exchanger to the heating heat exchanger. For this reason, the dry warm air dehumidified by the cooling heat exchanger and heated by the heating heat exchanger can be distributed to the vehicle interior. Therefore, for example, during the rainy season, the defogging effect on the windshield of the automobile can be enhanced.

[0016]

FIG. 1 is a perspective view showing a first embodiment which is an example of an embodiment of the present invention. FIG. 2 shows FIG.
FIG. 2 is a cross-sectional view schematically showing what is shown in FIG. FIG. 3 shows FIG.
2 is a sectional view taken along line XX of FIG. FIG. 4 is a perspective view showing a main part of the one shown in FIG.

The air conditioning unit 1 shown in FIGS.
The air conditioner is mounted on a vehicle and includes a blower 2 for introducing outside air outside the vehicle or inside air inside the vehicle compartment into the unit case. A sirocco fan 2a adopted as a blower fan is mounted on the blower 2, and the sirocco fan 2a
Are arranged at the top in the unit case 3.

The unit case 3 contains a sirocco fan 2
An outside air inlet 11 into which outside air flows and an inside air inlet 12 into which inside air flows are provided at a portion facing a. At the branch between the outside air inlet 11 and the inside air inlet 12 in the unit case 3, the outside air inlet 11 is opened and the inside air inlet 12 is opened.
Or a slide-type inside / outside air switching door 21 for closing the outside air inlet 11 and opening the inside air inlet 12 is disposed. In the unit case 3, a substantially U-shaped air passage 4 through which air from the air blower 2 flows is formed.

An air passage 4 located at the bottom of the unit case 3 has a filter 5 for removing dust in the air, and a pair of cooling heat exchangers 6 and 6 for cooling the air passing through the filter 5. And a heating heat exchanger 7 for heating the air blown through the filter 5. The two cooling heat exchangers 6 and 6 are disposed in a cool air passage 31 in which air blows bypassing the heating heat exchanger 7, and the cool air passage 31 transfers the air that has passed through the filter 5 to the cooling heat exchanger 6. And a cool air introduction part 31a for guiding the air to the outside.

The two cooling heat exchangers 6 and 6 are arranged such that the blast inflow surface 6a into which the blast flows surrounds the cool air introduction portion 31a and the blast inflow surface 6a of each cooling heat exchanger 6 defines the cold air introduction portion 31a. They are arranged to face each other. Cold air introduction part 31a
Is formed by a partition plate 32 which closes the space between the cooling heat exchangers 6 and 6 with the cooling heat exchangers 6 and 6.
The floor of the cool air introducing portion 31a is formed by the inner wall 3a of the unit case 3 that partitions the cool air introducing portion 31a and the drain reservoir 33.

The drain sump 33 is provided with two heat exchangers 6 for cooling.
The condensed water dehumidified and condensed by the cooling heat exchangers 6 and 6 is located below the cooling heat exchangers 6 and 6. The condensed water is supplied to a drain port (not shown) provided in the unit case 3.
It is designed to be drained from. In the cool air passage 31, the air blown through the cooling heat exchangers 6 flows from the air outlet surface 6b side of each cooling heat exchanger 6 toward the upper part of each cooling heat exchanger 6, and It is formed so as to merge above the exchangers 6,6. At the junction, a pivotable cold air door 22 that opens and closes the cold air passage 31 is arranged.

The heating heat exchanger 7 is disposed in the hot air passage 34 in which the air flows bypassing the cooling heat exchangers 6 and 6, and the cooling heat exchanger 6 and the cooling heat exchanger 6 in the cold air introduction part 31a. 6 is located downstream of the air flow. Therefore, the air flowing through the cool air introducing portion 31a of the cool air passage 31 is supplied to both the cooling heat exchangers 6,
6 is passed to the heating heat exchanger 7, and the cold air introduction part 31 a is connected to both cooling heat exchangers 6.
Hot air passage 3 that guides the air circulating around 6 to the heat exchanger 7 for heating
4 also serves as the warm air introduction part 34a. Heat exchanger 7 for heating
Is a blast inflow surface 7 against the blast flowing through the warm air introduction portion 34a.
a are arranged so as to be orthogonal.

The hot air passage 34 is formed so that the air passing through the heating heat exchanger 7 flows upward from the air outlet surface 7b of the heating heat exchanger 7 to the upper side of the heating heat exchanger 7. I have. In the hot air passage 34, a rotatable hot air door 23 that opens and closes the hot air passage 34 is disposed above the heating heat exchanger 7. The hot air door 23 and the cold air door 22 constitute an air mixing door 24 that adjusts the air volume ratio between the air volume passing through the hot air channel 34 and the air volume passing through the cold air channel 31.

When the air mix door 24 is in the full cool mode, the cool air door 22 opens the cool air passage 31,
The operation of the hot air door 23 is controlled so as to close the hot air passage 34. In the full hot mode, the operation is controlled such that the cool air door 22 closes the cool air passage 31 and the warm air door 23 opens the warm air passage 34. In the air mix mode, the operation is controlled so that the cold air door 22 makes the cold air passage 31 half open and the hot air door 23 makes the hot air passage 34 half open.

In the air passage 4 of the air-conditioning unit 1, both the cooling heat exchangers 6,
A dehumidifying and heating passage 35 for guiding the air passing through 6 to the heating heat exchanger 7 is also formed. The dehumidifying and heating passage 35 is provided on the air outlet surface 6 of each cooling heat exchanger 6 in the cold air passage 31.
It extends from the portion located on the side b to the air inflow surface 7a of the heat exchanger 7 for heating.

At the junction of the warm air passage 34a and the dehumidifying and heating passage 35 in the warm air passage 34, the dehumidifying and heating passage 35 is provided as needed in the full hot mode and the air mix mode.
Dehumidifying and heating door 25 that opens and closes the hot air introduction section 34a
Is arranged. The dehumidifying / heating door 25 normally closes the dehumidifying / heating passage 35 and opens the hot air introducing portion 34a.

The air passage 4 above the air mix door 24
Is an air mixing chamber 36 for mixing the air blown through the cool air passage 31 and the air blown through the warm air passage 34. The air passage 4 downstream of the air mix chamber 36
Is a defroster passage 37 having a defroster outlet 13
And a vent passage 38 having a vent outlet 14 and a foot passage 39 having a foot outlet 15.

In the defroster passage 37, a rotatable defroster door 26 for opening and closing the defroster passage 37 is arranged. A rotary vent door 27 that opens and closes the vent passage 38 is disposed in the vent passage 38. The foot passage 39 is provided with a pivotable foot door 28 for opening and closing the foot passage 39.

FIG. 5 is a cross-sectional view schematically showing the state shown in FIG. 1 in the full cool vent mode. FIG.
FIG. 6 is a sectional view taken along line XX of FIG. As shown in FIGS. 5 and 6, in the full cool vent mode, in the air mixing door 24, the cold air door 22 opens the cold air passage 31 and the hot air door 23 closes the hot air passage 34.
The defroster door 26 closes the defroster passage 37, the vent door 27 opens the vent passage 38, and the foot door 2
8 closes the foot passage 39.

For this reason, in the full-cool vent mode, the air blown through the filter 5 bypasses the heating heat exchanger 7 and passes through both cooling heat exchangers 6, 6, and passes through the cold air passage 31.
And the air is distributed from the vent outlet 14 to the upper body of the passenger in the passenger compartment. In the full-cool mode, the dehumidifying and heating door 25 closes the dehumidifying and heating passage 35 and opens the warm air introduction portion 34a of the warm air passage 34.

FIG. 7 is a sectional view schematically showing a normal state in the full hot differential foot mode shown in FIG. FIG. 8 is a sectional view taken along line XX of FIG.
As shown in FIGS. 7 and 8, in the normal state in the full hot differential foot mode, in the air mixing door 24, the cold air door 22 closes the cold air passage 31 and the hot air door 23 opens the hot air passage 34. are doing. The dehumidifying / heating door 25 closes the dehumidifying / heating passage 35 and opens the warm air introducing portion 34 a of the warm air passage 34. The defroster door 26 is connected to the defroster passage 3
7 is half-open, the vent door 27 closes the vent passage 38, and the foot door 28 half-opens the foot passage 39.

Therefore, the air passing through the filter 5 is
It bypasses the cooling heat exchangers 6 and 6, passes through the heating heat exchanger 7, flows through the hot air passage 34, and partially passes through the defroster outlet 1.
3 is distributed to the windshield of the vehicle, and the remainder is distributed to the foot of the passenger in the vehicle cabin from the foot outlet 15.

FIG. 9 is a sectional view schematically showing a dehumidifying and heating state in the full hot defroster mode of FIG. FIG. 10 is a sectional view taken along line XX of FIG. As shown in FIGS. 9 and 10, in the dehumidifying and heating state in the full hot / defroster mode, the air mix door 2
In 4, the cold air door 22 closes the cold air passage 31 and the warm air door 23 opens the hot air passage 34. Dehumidifying heating door 25
Open the dehumidifying and heating passage 35 and close the warm air introducing portion 34 a of the warm air passage 34. The defroster door 26 opens the defroster passage 37, the vent door 27 closes the vent passage 38, and the foot door 28 closes the foot passage 39.

Therefore, the air passing through the filter 5 is
After passing through both cooling heat exchangers 6, 6, the dehumidifying heating passage 3
5, the air flows through the heating heat exchanger 7, flows through the hot air passage 34, and is distributed from the defroster outlet 13 to the windshield of the automobile via the air mix chamber 36 and the defroster passage 37. Therefore, for example, in the rainy season, the dry hot air dehumidified by the cooling heat exchangers 6 and 6 and heated by the heating heat exchanger 7 can be blown to the windshield, and the defrosting effect on the windshield can be reduced. Can be enhanced.

FIG. 11 is a cross-sectional view schematically showing a normal state in the air mix / bi-level mode shown in FIG. FIG. 12 is a sectional view taken along line XX of FIG. As shown in FIG. 11 and FIG.
In the normal state at the time of the bi-level mode, in the air mix door 24, the cold air door 22 makes the cold air passage 31 half open, and the warm air door 23 opens the hot air passage 34. The dehumidifying / heating door 25 closes the dehumidifying / heating passage 35 and opens the warm air introducing portion 34 a of the warm air passage 34. The defroster door 26 closes the defroster passage 37, the vent door 27 half-opens the vent passage 38, and the foot door 28 closes the foot passage 3.
9 is half open.

Therefore, the air passing through the filter 5 is
A part bypasses the heat exchanger for heating 7 and both heat exchangers for cooling 6,
6 flows through the cold air passage 31, and the remainder bypasses the cooling heat exchangers 6 and 6, passes through the heating heat exchanger 7, and flows through the hot air passage 34. Then, the cool air that has passed through the cool air passage 31 and the warm air that has passed through the warm air passage 34 are mixed in the air mixing chamber 3.
The mixture is mixed at 6 to form an air-conditioned wind. Part of the conditioned air is distributed from the vent outlet 14 to the upper body of the occupant, and the remainder is distributed from the foot outlet 15 to the feet of the occupant. Note that, even in the air mix mode, it is of course possible to open the dehumidifying / heating passage 35 in the dehumidifying / heating door 25 and close the hot air introducing portion 34a.

By the way, in the conventional product shown in FIG. 14, the cooling heat exchanger d is arranged such that the blowing air inflow surface d1 intersects the cooling air introducing portion e1 of the cooling air passage e for guiding the blowing to the cooling heat exchanger d. Are located in On the other hand, in the first embodiment, the cooling heat exchanger 6 is arranged such that the blow-in surface 6a surrounds the cool air introduction portion 31a of the cool air passage 31.

Therefore, in the first embodiment, as compared with the conventional product shown in FIG. 14, the area of the blow-in surface 6a of the cooling heat exchanger 6 is enlarged to reduce the amount of air flow per unit area of the blow-in surface 6a. be able to. Therefore, the ventilation resistance of the cooling heat exchanger 6 can be made smaller than that of the conventional product shown in FIG. 14, and as a result, the air volume increases in all modes of the full cool mode, the full hot mode, and the air mix mode. And low noise can be achieved at the same time.

In addition, since the cooling heat exchanger 6 is arranged so that the air inlet surface 6a surrounds the cold air inlet 31a, the cooling heat exchanger 6 can be cooled while increasing the area of the air inlet surface 6a of the cooling heat exchanger 6. Heat exchanger 6 can be arranged compactly. Therefore, it is also possible to achieve both an increase in the area of the air inlet surface 6a of the cooling heat exchanger 6 and a reduction in the size of the air conditioning unit 1.

In the first embodiment, the cold air introducing portion 31a of the cold air passage 31 also serves as the hot air introducing portion 34a of the hot air passage 34 that guides air to the heating heat exchanger 7. For this reason, the cold air passage 31 and the hot air passage 34 can be partially shared and formed. In this respect, the size of the air conditioning unit 1 can be reduced.

Further, in the first embodiment, a dehumidifying / heating passage 35 is formed in the air passage 4 for guiding the air passing through the cooling heat exchangers 6, 6 to the heating heat exchanger 7. A dehumidifying and heating door 25 is provided in the dehumidifying and heating door 35 for opening the dehumidifying and heating passage 35 and closing the hot air introduction part 34a as required in the full hot mode and the air mix mode. For this reason, for example, in the rainy season, the dry hot air dehumidified by the cooling heat exchangers 6 and 6 and heated by the heating heat exchanger 7 can be blown onto the windshield of the automobile, thereby extinguishing the windshield. It can also enhance the fogging effect.

FIG. 13 is a perspective view showing a main part of a second embodiment which is another example of the embodiment of the present invention. In the following description of the second embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the description overlapping with the description of the first embodiment will be omitted.

In the first embodiment, the pair of cooling heat exchangers 6 and 6 are arranged opposite to each other with the cold air introducing portion 31 a of the cold air passage 31 interposed therebetween. For this reason, the side wall 3b of the unit case 3 located on the side of the air outflow surface 6b of each cooling heat exchanger 6
In order to form the cool air passage 31 between the cooling heat exchanger 6 and the cooling heat exchanger 6, the side wall 3b must be separated from the cooling heat exchanger 6 by a predetermined distance.

On the other hand, in the second embodiment, the pair of cooling heat exchangers 6 and 6
The top of each cooling heat exchanger 6 is arranged closer to the bottom than the bottom. For this reason, in the second embodiment, even when the side wall 3b of the unit case 3 is disposed close to the bottom of the cooling heat exchanger 6, the cool air passage 31 is formed between the side wall 3b and the cooling heat exchanger 6. be able to. Therefore, the distance between the side walls 3b, 3b can be reduced as compared with the first embodiment, and as a result, the air conditioning unit 1
Can be reduced in size.

In the first and second embodiments described above, a pair of cooling heat exchangers 6 and 6 are arranged so as to surround the cool air introducing portion 31a of the cool air passage 31. However, the number of cooling heat exchangers 6 to be arranged is not limited to two, and may be plural such as three or four.
This is because a plurality of cooling heat exchangers 6 may be arranged so as to surround the cool air introducing portion 31a of the cool air passage 31.

Alternatively, for example, the cooling heat exchanger 6 is formed in an inverted V-shape, an inverted U-shape, a tubular shape, a V-shape, or a U-shape so as to surround the cool air introducing portion 31a of the cool air passage 31. It is also possible to dispose one cooling heat exchanger 6 in the first embodiment. When one cooling heat exchanger 6 having an inverted V-shape or the like is arranged so as to surround the cold air introduction part 31a, a refrigerant pipe required when at least two cooling heat exchangers 6 are arranged. Branching to each cooling heat exchanger 6 becomes unnecessary, and the number of assembly steps can be reduced.

In both the first and second embodiments, the dehumidifying / heating door 25 is disposed at one place where the dehumidifying / heating passage 35 and the hot air introducing portion 34a of the hot air passage 34 meet.
However, it is of course possible to dispose the dehumidifying and heating door 25 in each of the dehumidifying and heating passage 35 and the warm air introducing portion 34a. However, it is preferable to dispose the dehumidifying and heating door 25 at one location where the dehumidifying and heating passage 35 and the hot air introducing portion 34a meet, because the number of components is reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view schematically showing what is shown in FIG.

FIG. 3 is a sectional view taken along line XX of FIG.

FIG. 4 is a perspective view showing a main part of the one shown in FIG.

FIG. 5 is a cross-sectional view schematically showing the state shown in FIG. 1 in a full cool vent mode.

FIG. 6 is a sectional view taken along line XX of FIG.

FIG. 7 is a cross-sectional view schematically showing a normal state in a full hot differential foot mode shown in FIG. 1;

FIG. 8 is a sectional view taken along line XX of FIG.

FIG. 9 is a cross-sectional view schematically showing a dehumidifying and heating state in the full hot defroster mode shown in FIG.

FIG. 10 is a sectional view taken along line XX of FIG.

FIG. 11 is a cross-sectional view schematically showing a normal state in the air mix / bi-level mode of FIG.

FIG. 12 is a sectional view taken along line XX of FIG.

FIG. 13 is a perspective view showing a main part of a second embodiment of the present invention.

FIG. 14 is a sectional view showing an example of a conventional product.

FIG. 15 is a cross-sectional view schematically showing another example of a conventional product.

[Explanation of symbols]

 2 Blower 6 Cooling heat exchanger 6a Blow-in surface of cooling heat exchanger 7 Heating heat exchanger 24 Air mix door 25 Dehumidification heating door 31 Cold air passage 31a Cold air introduction part 34 Hot air passage 34a Hot air introduction part 35 Dehumidification Heating aisle

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masato Ohno 5-24-15 Minamidai, Nakano-ku, Tokyo

Claims (3)

[Claims] 1. A cooling air passage (31) through which a blown air from a blower (2) bypasses a heating heat exchanger (7) and passes through a cooling heat exchanger (6). Blowing air bypasses the cooling heat exchanger (6) and passes through the heating heat exchanger (7). The hot air passage (34) flows through the cold air passage (31). ), The air-conditioning unit for a vehicle including an air mixing door (24) for adjusting an air volume ratio with an air volume passing through the cold air passage (31). Cooling heat exchanger (6) including a cool air introduction part (31a) for guiding
Is an air conditioning unit for a vehicle, characterized in that a blast inflow surface (6a) into which a blast flows is arranged so as to surround a cool air introduction part (31a). 2. The air conditioning unit for a vehicle according to claim 1, wherein the heating heat exchanger (7) is located downstream of the cooling heat exchanger (6) of the cold air introduction part (31a). The air for a vehicle is arranged, and the cold air introduction part (31a) also serves as a hot air introduction part (34a) of a hot air passage (34) that guides air to the heating heat exchanger (7). Harmony unit. 3. The air conditioning unit for a vehicle according to claim 1, wherein a hot air passage (34) that guides an air flow bypassing the cooling heat exchanger (6) to the heating heat exchanger (7). ) Warm air introduction part (34a)
A dehumidifying / heating passage (35) for guiding the blast passing through the cooling heat exchanger (6) to the heating heat exchanger (7); and a dehumidifying / heating passage (3) as required at least in the full hot mode.
5) An air conditioning unit for a vehicle, comprising: a dehumidifying / heating door (25) for opening the warm air introduction section (34a) and closing the warm air introduction section (34a).