JPH11278038A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce ventilating resistance by uniformly mixing hot air and cold air and to manufacture an air conditioner in simple constitution and at a low cost. SOLUTION: An outlet of a hot air passage 12 or a cold air passage 13 is opened and closed by each of opening and closing plates 15a, 15b of a second mixing damper 6. At the time of the maximum heating or the maximum cooling, the mixing damper 6 is revolved so that the outlet of the hot air passage 12 or the cold air passage 13 is totally opened by each of the opening and closing plates 15a, 15b. Additionally, at the time of controlling temperature to desired temperature, each of the opening and closing plates 15a, 15b is positioned at the outlet of the hot air passage 12 or the cold air passage 13, and hot air and cold air is mixed through the adjacent opening part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner.

[0002]

2. Description of the Related Art Conventionally, as a means for uniformly mixing warm air from a warm air passage and cool air from a cool air passage, an air conditioner for a vehicle having the following structure has been proposed (for example, Japanese Patent Publication No. Hei 4 (1994)). -60843).

That is, in this vehicle air conditioner, FIG.
As shown in FIG. 5, the auxiliary damper 101 provided separately from the mix damper 100 is rotated to a position b shown by a solid line in a state where the mix damper 100 is rotated to a position a shown by a solid line. 102 heater core 103
Hot air obtained by heating in a cold air passage 10 without heating
4 as it is so that it can be mixed with the cold air obtained. The opening area of the opening 105 is formed to be small so that the mixing can be performed uniformly.

[0004] The hot air passage 1 is
When 02 is fully closed, the auxiliary damper 101 is rotated to the position shown by the dashed line in FIG. 8 so that the cool air passes through only the cool air passage 104 and is then blown into the vehicle.

Further, when the cool air passage 104 is completely closed by the mix damper 100, the auxiliary damper 101 is rotated to a position shown by a dashed line in FIG. After being heated by the air, it is blown into the car.

[0006]

By the way, the opening 10
As shown by the solid line in FIG. 9, there is a relationship between the opening area of No. 5 and the air mixing property that the larger the opening area is, the more difficult it is to achieve uniform mixing. On the other hand, the opening area of the opening 105 and the ventilation resistance are, as shown by the dashed line in FIG.
There is a relationship that the ventilation resistance increases as the opening area decreases. In other words, there is a contradictory relationship that the ventilation resistance increases when trying to obtain excellent air mix properties, and the air mix properties deteriorates when trying to reduce the ventilation resistance.

[0007] In the vehicle air conditioner, the same flow path (opening) flows when hot air and cold air are mixed and blown into the vehicle, and when only warm air is blown into the vehicle. In other words, the conventional vehicle air conditioner has a structure in which excellent air mixability and small ventilation resistance cannot be simultaneously satisfied. In this case, it is conceivable that a part of the wall surface forming the opening 105 is formed by a damper. However, it is necessary to link the mix damper 100 and the damper, and the structure becomes complicated and the cost is increased. Is inevitable.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle air conditioner which can be manufactured at a low cost with a simple structure capable of uniformly mixing hot air and cold air and reducing ventilation resistance.

[0009]

According to the present invention, as means for solving the above-mentioned problems, inside air or outside air introduced into an air conditioning unit is cooled and dehumidified by an evaporator, diverted by a mix damper, and one of them is heated. In a vehicle air conditioner, which is heated by a heater core disposed in an air passage and passed through a cold air passage while leaving the other as it is, the two are mixed, and the air is blown into the vehicle through an air distribution chamber. A second mix damper that rotates around the center and includes a pair of open / close plates that opens and closes the outlet of the hot air passage or the cool air passage is provided, and an opening is formed adjacent to each of the open / close plates. is there.

At the time of maximum heating or maximum cooling, the second mix damper is rotated so that the outlet of the warm air passage or the cool air passage is fully opened, whereby the ventilation resistance can be suppressed. Further, when controlling the temperature to a desired temperature, the opening / closing plates of the second mix damper are located at the outlets of the hot air passage and the cold air passage, so that the hot air and the cold air are effectively effected through the adjacent openings. Mix thoroughly.

It is preferable that the guide wall is extended from the edge of the opening formed in the second mix damper, because the spread of the passing air is suppressed and the mixing of the hot air and the cold air can be more effectively performed.

[0012] At least a part or all of the wall surfaces forming the outlets of the hot air passage or the cold air passage may be constituted by a bypass damper.

In addition, a bypass passage communicating with at least one of the outlets of the hot air passage and the cool air passage is formed, and the outlet of the bypass passage is disposed in the air distribution chamber. It may be opened and closed by a damper.

With these configurations, even if the second mix damper that uniformly mixes hot air and cold air is employed,
For example, when it is necessary to make the blast temperature different between the head and feet of the occupant, as in the bi-level mode, warm air or cool air can be directly blown into the vehicle by a bypass damper or a bypass passage.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a vehicle air conditioner according to the present embodiment. In this vehicle air conditioner, the intake door 2, the blower fan 3, the evaporator 4, the first mix damper 5, the second mix damper 6, and the intake door 2 are arranged in order from the upstream side in the air conditioning unit 1 disposed in the front panel in the vehicle. A heater core 7 is provided, and a downstream side thereof is an air distribution chamber 8.

The structure on the air distribution chamber side shown in FIG. 1 is a schematic one, and is actually configured as shown in FIG.

The intake door 2 is capable of introducing outside air or inside air into the air conditioning unit 1 by closing either the inside air introduction port 9 or the outside air introduction port 10 depending on its rotation position.

The blower fan 3 is supplied with electric power from an alternator (not shown) or a battery to supply air to the blower motor 11.
Is driven to rotate.

The evaporator 4 cools and dehumidifies the air passing through the outside (total air flowing in the air conditioning unit) by vaporizing the refrigerant circulating in a refrigeration cycle (not shown) when flowing inside. .

The first mix damper 5 changes the ratio of the air cooled and dehumidified by the evaporator 4 passing through the hot air passage 12 or the cold air passage 13 depending on the rotation position.

The heater core 7 is disposed in the hot air passage 12 and heats the air passing through the external hot air passage 12 when the engine cooling water flows inside.

As shown in FIG. 2, the second mix damper 6 integrates the first and second opening / closing plates 15a, 15b so as to form a predetermined angle with the shaft portion 14, and the opening / closing plates 15a, 15b
The openings 16a and 16a are adjacent to each other with the shaft 14 interposed therebetween.
16b are respectively formed. Each opening 16
Guide walls 17 are provided on the upper and lower edges of a and 16b. The space sandwiched by the guide walls 17 from the openings 16a and 16b facilitates mixing of hot air and cold air flowing through the openings 16a and 16b, and serves to increase the rigidity of the second mix damper 6. Also plays. As shown in FIG. 3, the second mix damper 6 includes the first opening / closing plate 1.
5a, the hot air outlet 18 formed at the boundary between the hot air passage 12 and the air distribution chamber 8 is opened and closed.
A cold air outlet 19 formed at the boundary between the air flow chamber 3 and the air distribution chamber 8 is opened and closed. The first opening / closing plate 15a is a hot air outlet 18
When the second opening / closing plate 15b is located at the cool air outlet 19, warm air and cold air can be mixed by the adjacent first and second openings 16a and 16b. Although the guide wall 17 is constituted by a pair of wall surfaces facing each other in the up-down direction, if the guide wall is provided also on the side edge, it is possible to further enhance the air mix property.

In the air distribution chamber 8, a heat outlet 20, a vent outlet 21 and a differential outlet 22 are provided, and a heat damper 23, a vent damper 24 and a differential damper 25 are provided, respectively.
The degree of opening is adjusted by means of.

Next, the operation of the vehicle air conditioner having the above-described configuration will be described.

The blower motor 11 drives the blower fan 3 to rotate, so that inside air or outside air is introduced into the air conditioning unit 1. The introduced air is cooled and dehumidified by the evaporator 4 and diverted by the first mix damper 5.

In the case of maximum heating in which the first mix damper 5 is turned to the position shown by the solid line in FIG. 3 and the cold air passage 13 is completely closed, the second mix damper 6 is turned to the position shown by the solid line in FIG. Then, the warm air outlet 18 is fully opened. Further, the heat damper 23 rotates, and only the heat outlet 20 is opened.
As a result, all the air dehumidified by the evaporator 4 passes through the warm air passage 12 and is heated by the heater core 7, and is blown into the vehicle from the air distribution chamber 8 through the heat outlet 20. Also in this case, a desired cross-sectional area can be ensured over the entire flow path, so that it is possible to heat the inside of the vehicle with a desired airflow while suppressing ventilation resistance.

In the case of the maximum cooling in which the first mix damper 5 is rotated to the position shown by the two-dot chain line in FIG. 3 to completely close the hot air passage 12, the second mix damper 6 is similar to the case of the maximum heating. 3 to the position indicated by the solid line in FIG.
Is fully opened. Further, the vent damper 24 rotates, and only the vent outlet 21 is opened. Thereby, all the air cooled and dehumidified by the evaporator 4 passes through the air distribution chamber 8 from the cold air passage 13 and is blown into the vehicle through the vent outlet 21. In this case, since the cold air outlet 19 is fully open and a desired cross-sectional area can be secured over the entire flow path,
It is possible to cool the inside of the vehicle with a desired amount of air while suppressing ventilation resistance.

Further, when the first mix damper 5 is located, for example, at the position shown by the solid line in FIG. 4, that is, when the temperature is adjusted to a desired temperature and is blown into the vehicle, the hot air outlet 18 and the cold air outlet 19 Each open / close plate 15 of the second mix damper 6
a and 15b are respectively located. Thereby, the warm air passage 12 and the cool air passage 13 and the air distribution chamber 8
a, 16b. Each opening 16a, 16b
Are provided adjacent to each other, so that the warm air from the warm air passage 12 and the cool air from the cool air passage 13 are uniformly mixed and blown into the vehicle through the corresponding outlet.

Therefore, for example, when air is blown into the vehicle from a plurality of openings (not shown) through the vent outlet 21 in the vent mode, air at a uniform temperature can be blown out from each of the openings. This solves the problem that the occupant feels uncomfortable, such as a difference in air temperature between the driver's seat and the passenger's seat.

The openings 16a, 1 having a small opening area are provided.
6b, the ventilation resistance increases. However, adjusting the ventilation temperature by changing the rotation position of the first mix damper 5 is performed by performing maximum cooling or maximum heating, and comparing the vehicle interior temperature with the target temperature. This is after the amount of air is reduced by reducing the difference. In other words, when the temperature-controlled air is blown into the vehicle, the amount of air to be blown is not so much required, so that a decrease in the amount of air blown due to an increase in ventilation resistance does not pose a problem.

Incidentally, the wall surface forming the hot air outlet 18 and the cold air outlet 19 may be constituted by a bypass damper 26 as shown in FIG. The bypass damper 26 is configured to change the rotation position according to the air blowing mode. For example, when the wall constituting the cold air outlet 19 is constituted by the bypass damper 26, the second mix damper 6 is located at the hot air outlet 18 and the cold air outlet 19,
If both the vent outlet 21 and the heat outlet 20 are open in the bi-level mode, by rotating the bypass damper 26, the cool air passing through the cool air passage 13 can be blown directly from the vent outlet 21. . Thereby, it is possible to make a difference in the blowing temperature between the heat outlet 20 and the vent outlet 21 (see the dashed line in FIG. 5), and to supply the cool air to the occupant's head and the warm air to the feet. And a comfortable air-conditioning state can be obtained.

The bypass damper 26 may be formed on a part of the wall surface, may be formed on the entire wall surface, or may be formed on only one of the wall surfaces.

The hot air passage 12 or the cold air passage 13
The upstream and downstream sides of the outlet may be communicated with each other by a bypass passage 27 as shown in FIG. In this case, the outlet 27a of the bypass passage 27 can be opened and closed by a sub damper 28 integrated with any of the dampers provided in the air distribution chamber 8. For example, the sub damper 2 is
When the sub-damper 8 is provided, an opening 28a is formed in the sub-damper 28, and the outlet 27a of the bypass passage 27 is opened and closed by the opening 28a. In the case of the bi-level mode, the opening degree of the heat outlet 20 by the heat damper 23 becomes 1/2, and the opening 28a is located at the outlet 27a.
The cool air passing through 3 is blown into the vehicle directly from the vent outlet 21 through the bypass passage 27. Thereby, it is possible to make a difference in the blowing temperature between the heat outlet 20 and the vent outlet 21. In the case of the vent mode, the heat damper 23 closes the heat outlet 20. In the case of the heat mode, the heat damper 23 fully opens the heat outlet 20. In any case, the outlet 27a is connected to the sub damper 2.
8 closed.

[0035]

As is clear from the above description, according to the air conditioner for a vehicle according to the present invention, the second mix damper having the adjacent opening is provided, so that the cool air and the hot air are generated at the opening. The air can be uniformly mixed, and at the time of maximum cooling or maximum heating, the outlet of the cool air passage or the warm air passage is fully opened to suppress the ventilation resistance and obtain a desired air flow.

Further, since the guide wall is extended from the edge of the opening, a space area in which the cold air and the hot air can be mixed can be increased, and the mixing can be performed more uniformly. Alternatively, it serves as reinforcement to increase rigidity.

In addition, since the wall surfaces forming the outlets of the hot air passage and the cool air passage are formed by bypass dampers, or bypass passages communicating the upstream and downstream sides of each outlet are formed, it is necessary to blow air into the vehicle from a plurality of locations. In some cases, the blowing temperature from each outlet can be different. Thus, for example, in the case of the bi-level mode, it is possible to supply cold air to the occupant's head and supply warm air to the feet.

[Brief description of the drawings]

FIG. 1 is a schematic plan sectional view showing an air conditioning unit of a vehicle air conditioner according to the present embodiment.

FIG. 2 is a perspective view of a second mix damper of FIG. 1;

FIG. 3 is a sectional view showing the vicinity of an air distribution chamber.

FIG. 4 is a sectional view showing the vicinity of an air distribution chamber.

FIG. 5 is a graph showing a relationship between an air conditioning mode and a blowing temperature.

FIG. 6 is a perspective view of the vicinity of a second mix damper according to another embodiment.

FIG. 7 is a perspective view of the vicinity of a second mix damper according to another embodiment.

FIG. 8 is a sectional view showing an air conditioning unit of a vehicle air conditioner according to a conventional example.

FIG. 9 is a graph showing a relationship between a flow path area and air mixability or ventilation resistance.

[Explanation of symbols]

 1: Air conditioning unit 4: Evaporator 5: First mix damper 6: Second mix damper 7: Heater core 12: Hot air passage 13: Cold air passage 15: Opening / closing plate 16: Opening 17: Guide wall 18: Hot air outlet 19: Cold air outlet 26: Bypass damper 27: Bypass passage 28: Sub damper

Claims (4)

[Claims] 1. Inside air or outside air introduced into an air conditioning unit is cooled and dehumidified by an evaporator, divided by a mix damper, and heated by a heater core provided in a hot air passage.
After passing through the cold air passage while leaving the other as it is, in a vehicle air conditioner that mixes the two and blows the inside of the vehicle through the air distribution room, a pair of the opening and closing the outlet of the hot air passage or the cold air passage An air conditioner for a vehicle, wherein a second mix damper including an opening / closing plate is provided, and an opening is formed adjacent to each of the opening / closing plates. 2. The vehicle air conditioner according to claim 1, wherein a guide wall extends from an edge of an opening formed in each of the open / close plates of the second mix damper. 3. The device according to claim 1, wherein at least a part or all of a wall surface constituting each outlet of the hot air passage or the cool air passage is constituted by a bypass damper. Vehicle air conditioners. 4. A bypass passage communicating at least one of the outlets of the hot air passage and the cool air passage with the upstream and downstream sides thereof, and the outlet of the bypass passage is disposed in the air distribution chamber. The vehicle air conditioner according to claim 1, wherein the vehicle air conditioner can be opened and closed by a damper.