JP2001088532A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an occupant from feeling uncomfortable due to the nonuniformity of blowoff temperature by mixing cold air and warm air into a uniform temperature in a shorter distance even in case of multilayer structure in which cold air and warm air flow alternately in multiple layers. SOLUTION: Cold air independent layers 51, 54 allowing the flow of only cold air, and warm air independent layers 52, 53 allowing the flow of only warm air, are provided, and cold air and warm air layers 53 allowing the flow of both cold air and warm air are provided at the rate of one stage out of at least three stages of a multilayer type ventilation flue 6 allowing cold air and warm air to flow alternately in multiple layers. Cold air flowing into the cold air and warm air layers 53 from a cold air lead-in passage 41 thereby collides with warm air flowing into the cold air and warm air layers 53 from a warm air lead-in passage 42. The nonuniformity of temperature distribution in the cold air independent layers 51, 54 and warm air independent layers 52, 55 which divide cold air and warm air completely in multiple layers can be dissolved by the temperature distribution of the cold air and warm air layers 53 which do not divide cold air and warm air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle provided with a multi-layered ventilation path composed of a plurality of air layers in which cold air and warm air are alternately flowed in a multilayer.

[0002]

2. Description of the Related Art As a conventional technique, Japanese Patent Laid-Open Publication No.
There is an air conditioner for a vehicle described in Japanese Patent Publication No. 0. This air conditioner for a vehicle is provided with a cold air bypass door that guides the cold air and the warm air so as to flow alternately in a multilayered manner close to each other, so that when the cold air bypass door is open, the downstream of the cold air bypass door is provided. In the mixing section on the side, the cool air and the warm air are quickly mixed over a short distance.

[0003]

However, in a conventional vehicle air conditioner, the cold air and the warm air are mixed with each other quickly by alternately flowing the cool air and the warm air in a multilayered manner. However, since the cold air and the warm air are completely alternately divided into a multilayer shape, as shown in the schematic diagram of FIG. 6, the cold air and the warm air intersect three-dimensionally, thereby biasing the temperature distribution. Will occur. Therefore, there is a problem in that the cool air and the warm air do not mix at a uniform temperature in the mixing portion, and as shown in the graph of FIG.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a multilayer structure in which cool air and warm air are alternately flowed in a multilayer structure so that the temperature distribution between the cool air and the warm air is not deviated, and the temperature is reduced to a uniform value over a shorter distance. Accordingly, it is an object of the present invention to provide a vehicle air conditioner that does not give an occupant an uncomfortable feeling due to a non-uniform blowout temperature.

[0005]

According to the first aspect of the present invention, warm air passing through the heat exchanger for heating and cold air bypassing the heat exchanger for heating alternately flow in a multilayered manner. By providing a cool air warm air layer in which both the cool air and the warm air flow every several stages in the air layers of the plurality of air layers, it is possible to prevent the cool air and the warm air from being completely alternately divided into a multilayer shape. .

[0006] Thus, the bias of the temperature distribution in the single layer of the cold air and the single layer of the warm air, which completely separates the cool air and the warm air into a multilayer, can be reduced by the cold air and the warm air layer in which both the cool air and the warm air flow. Can be eliminated by the temperature distribution. Therefore, the cool air and the warm air can be mixed at a uniform temperature over a shorter distance, and the passenger does not feel uncomfortable due to the uneven outlet temperature.

According to the second aspect of the present invention, by providing a partition in the cold wind warm air layer through which both the cold wind and the warm wind flows, the cold wind through which the cold wind crosses the warm wind two-dimensionally. By partitioning the passage and the warm air passage through which the warm air flows after crossing the cool air two-dimensionally, the cool air and the warm air flowing out of the ventilation passage are more likely to collide with each other, and the bias of the temperature distribution is further eliminated. be able to.

[0010] According to the third aspect of the present invention, by providing the cold-air / hot-air layer through which both the cool air and the warm air are flown at a ratio of one stage per three stages, at least one stage per three stages. It is possible to provide a layer that does not separate cold and warm air, that is, a layer that causes cold and warm air to collide. As a result, the bias of the temperature distribution in the cold air single layer and the warm air single layer, which completely separates the cool air and the warm air into multiple layers, is reduced by the temperature distribution in the cold air warm air layer in which both the cold air and the warm air flow. Can be efficiently eliminated.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Configuration of First Embodiment] FIGS. 1 to 4 show a first embodiment of the present invention, and FIG. 1 is a configuration diagram showing a schematic configuration of a vehicle air conditioner. , FIG. 2 and FIG. 3 are schematic views showing a multi-layer ventilation path of the air conditioning unit.

The vehicle air conditioner according to the present embodiment includes an air conditioning unit for air conditioning a vehicle cabin of a vehicle. This air conditioning unit has an air conditioning duct 1 for guiding air into the vehicle interior. On the upstream side of the air conditioning duct 1, an inside / outside air switching means and a centrifugal blower are provided.

The inside / outside air switching means includes an inside / outside air switching box 13 having an inside air suction port 11 for sucking vehicle interior air (inside air) and an outside air suction port 12 for sucking vehicle interior air (outside air). It comprises an inside / outside air switching door 14 for selectively opening and closing the inside air suction port 11 and the outside air suction port 12.

The centrifugal blower generates an airflow toward the passenger compartment. The blower case 15 is integrally formed on the downstream side of the inside / outside air switching box 13 and is rotatably accommodated in the blower case 15. It comprises a centrifugal fan 16 and a blower motor 17 for driving the centrifugal fan 16 to rotate.

On the downstream side of the air-conditioning duct 1, an air outlet switching means is provided. The outlet switching means includes a defroster (DEF) opening 18 and a face (FACE) opening 1
9 and a foot (FOOT) opening portion 20 are formed. The outlet switching box 21 is provided with the mode switching doors 22 and 23 for switching the outlet mode.

The DEF opening 18 is provided with a defroster (DE
F) Windshield 25 of the vehicle via duct 24
Is connected to a defroster (DEF) outlet 26 for blowing air-conditioned air (mainly warm air) to the inner surface of the air conditioner. Also, FAC
The E opening 19 communicates through a face (FACE) duct 27 with a face (FACE) outlet 28 for blowing out conditioned air (mainly cold air) to the occupant's head and chest (upper body).

Further, the FOOT opening 20 is provided with a foot (F) through which a conditioned air (mainly warm air) is blown out to the foot (lower body) of the occupant through a foot (FOOT) duct 29.
OOT) It communicates with the outlet 30. The mode switching door 22 selectively opens and closes the DEF opening 18 or the FACE opening 19. Further, the mode switching door 23 selectively opens and closes the FOOT opening 20.

Here, between the centrifugal blower and the outlet switching means, an evaporator 2 as a cooling heat exchanger for cooling the air flowing in the air conditioning duct 1 and heating the air flowing in the air conditioning duct 1. A heater core 3 as a heat exchanger for heating, an air mix (A / M) door 5 for adjusting the amount of cold air and the amount of warm air, a multilayer ventilation path 6 for flowing cool air and warm air in a multilayer, and a cooling air passage. A mixing unit 7 for mixing the warm air is provided.

The evaporator 2 is disposed so as to cover the entire air passage in the air conditioning duct 1, and exchanges heat between air blown by a centrifugal blower and the refrigerant flowing therein to evaporate and evaporate the refrigerant. Evaporator is one of the components that make up the refrigeration cycle. In the refrigerating cycle, a compressor (refrigerant compressor), a condenser (refrigerant condenser), a receiver (gas-liquid separator), an expansion valve, and an evaporator 2 are connected so that the refrigerant circulates.

The heater core 3 is disposed downstream of the evaporator 2, and heats the passing air using the cooling water of the engine as a heat source for heating. The heater core 3 is provided at a biased position so that air flowing in the air conditioning duct 1 forms a bypass passage 4 that flows around the heater core 3.

The A / M door 5 corresponds to the cool air / hot air distribution means of the present invention. The A / M door 5 is rotatably supported on the upstream side of the heater core 3 so that the warm air passing through the heater core 3 and the bypass passage 4 are provided. The ratio of the amount of warm air that has passed through the heater core 3 and the amount of cool air that has passed through the bypass passage 4 is adjusted by sorting the cool air that has passed through the heater core 3.

As shown in FIGS. 2 and 3, the multilayer ventilation passage 6 is formed in a temperature control case 9 provided integrally between the heater core 3 and the bypass passage 4 and the outlet switching box 21. Have been. On the upstream side of the multilayer ventilation path 6,
A cool air introduction passage 41 into which the cool air passing through the bypass passage 4 is introduced, and a warm air introduction passage 42 into which the warm air passing through the heater core 3 is introduced.

On the downstream side of the multilayer ventilation path 6, there are provided a plurality of (for example, five) air layers (multilayer regions) in which cool air and warm air alternately flow in a multilayered manner. The air layers of the plurality of stages are formed by a single layer of cold air (eg, 50 mm × 10
mm) 51 and 54, warm air single layers (for example, about 50 mm × 10 mm) for flowing only warm wind, and cold and warm air layers (for example, 50 mm × 1) for flowing both cool wind and warm wind.
53 (approximately 0 mm). Note that the cool air / warm air layer 53 is provided at a ratio of at least one of three air layers among a plurality of air layers.

The single layer 51 of the cool air and the single layer 52 of the warm air are partitioned in the vertical direction in the drawing (the laminating direction of the air layers) by a partition plate 43 arranged along the flow direction of the air. In addition, between the warm wind independent layer 52 and the cool wind warm wind layer 53,
It is partitioned in the vertical direction in the figure by a partition plate 44 arranged along the direction of air flow.

Then, the cool air warm air layer 53 and the cool air single layer 54
Is partitioned in the vertical direction in the figure by a partition plate 45 arranged along the flow direction of air. In addition, the cold air single layer 54 and the warm air single layer 55 are partitioned in the vertical direction in the figure by a partition plate 46 arranged along the air flow direction.

Here, the upstream side of the cool air single layers 51 and 54 communicates only with the cool air introduction passage 41 so that the cool air passing through the evaporator 2 flows into the inside through the bypass passage 4 and the cool air introduction passage 41. A mouth (not shown) is provided. As shown in FIG. 3, the cool air flows in the cool air single layers 51 and 54 toward the right side in the drawing.

On the upstream side of the warm air single layers 52 and 55, communication ports are provided only on the warm air introducing passage 42 side so that the warm air passing through the heater core 3 flows into the inside through the warm air introducing passage 42. (Not shown) is provided. As shown in FIG. 3, the warm air flows in the warm air single layers 52 and 55 toward the left side in the drawing.

On the upstream side of the cool air / warm air layer 53, communication ports (both on both the cold air introduction passage 41 side and the warm air introduction passage 42 side are provided so that both the cool air and the warm air flow into the inside. (Not shown). This cold and warm wind layer 5
In FIG. 3, since the cold wind and the warm wind intersect so as to collide with each other on the upstream side, as shown in FIG. 3, the cold wind flows toward the left side in the drawing and the warm wind flows toward the right side in the opposite direction to the other layers as shown in FIG. Flows.

The mixing section 7 is connected to each outlet of the multilayer ventilation passage 6
Provided between the EF opening 18, the FACE opening 19 and the FOOT opening 20, the cool air and the warm air flowing out of each outlet of the multilayer ventilation path 6 are efficiently mixed to make the outlet temperature uniform. An air chamber for converting

[Operation of the First Embodiment] Next, the operation of the air conditioning unit of the vehicle air conditioner of the present embodiment will be briefly described with reference to FIGS.

The air sucked into the air conditioning duct 1 by the rotation of the centrifugal fan 16 of the centrifugal blower is cooled when passing through the evaporator 2 to become cool air. And
When the position of the A / M door 5 is the position shown in FIG. 1, part of the cool air blown out from the evaporator 2 is
, And flows into the cool air introduction passage 41. Then, the cool air flowing into the cool air introduction passage 41 passes through the cool air single layer 51, the cool air warm air layer 53, and the cool air single layer 54, and flows into the mixing unit 7.

On the other hand, the remainder of the cool air blown from the evaporator 2 is heated when passing through the heater core 3 to become warm air. Then, the warm air blown out from the heater core 3 flows into the warm air introduction passage 42. Then, the warm air flowing into the warm air introduction passage 42 passes through the warm air single layer 52, the cool wind warm air layer 53, and the warm air single layer 55, and flows into the mixing unit 7.

Then, the cool air single layer 51 and the cool air warm air layer 53
And the cold and warm air single layer 52, the cold and warm air layer 53, and the warm air only layer 55 that flowed into the mixing section 7 from the cool air single layer 54.
The warm air flowing into the mixing section 7 is instantaneously mixed.
In particular, in the cool air warm air layer 53, the temperature is equalized by the collision of the cool air flowing from the cool air introducing passage 41 and the warm air flowing from the warm air introducing passage 42 and mixing.

[Effects of the First Embodiment] As described above, in the air-conditioning unit of the present embodiment, the cool-air single layers 51 and 54 that allow only the cool air to flow and the warm-air single layers 52 and 55 that allow only the warm air to flow. In the multilayer ventilation path 6 in which the cool air and the warm air are alternately caused to flow in a multilayered manner, a cool air / warm air layer 53 through which both the cool air and the warm air flow is provided at a rate of at least one stage per three stages. The provision prevents the cold wind and the warm wind from being completely divided into multiple layers.

Accordingly, the cool air flowing through the bypass passage 4 and flowing into the cool air warm air layer 53 from the cool air introducing passage 41 and the warm air flowing through the heater core 3 and flowing into the cool air warm air layer 53 from the warm air introducing passage 42 are provided. And two-dimensionally intersect and collide with each other, whereby the bias of the temperature distribution in the cool air single layers 51 and 54 and the warm air single layers 52 and 55, which completely separate the cold wind and the warm wind into a multilayer, This can be solved by the temperature distribution in the cold wind warm air layer 53 in which the cold wind and the warm wind are not separated.

Therefore, in the mixing section 7 on the downstream side of the multilayer ventilation path 6, the cool air and the warm air can be mixed at a uniform air temperature over a shorter distance, so that each outlet (for example, FACE in the cooling mode) can be used. There is no discomfort to the occupant due to the uneven outlet temperature of the air blown into the vehicle interior from the DEF outlet 26 or the FOOT outlet 30) in the air outlet 28 or the heating mode.

[Experimental Results of First Embodiment] Next, FAC
By installing a plurality of temperature sensors in the E outlet 28, A / M
A description will be given of an experiment in which various door positions are variously changed to investigate how each outlet temperature changes.

In the first experiment, the A / M door position of the type in which the cool air warm air layer 53 for flowing both the warm air and the cool air in the multilayer ventilation path 6 as in the present embodiment is changed, It was investigated how each outlet temperature changes, and the experimental results are shown in the graph of FIG.

A second experiment was conducted to change the A / M door position of a type in which cold air and warm air were completely separated as in the prior art, and how each outlet temperature changes. The results of the experiment were shown in the graph of FIG.

Therefore, the graph of FIG.
As can be confirmed from the graph, the maximum temperature difference of the outlet temperature of the conventional technology is 58 ° C., whereas the maximum temperature difference of the outlet temperature of the present embodiment is 14 ° C. In this embodiment, the outlet temperature can be made more uniform.

[Second Embodiment] FIG. 5 shows a second embodiment of the present invention, and is a schematic view showing a multi-layer ventilation passage of an air conditioning unit.

In this embodiment, the cold air passage 56 through which the cold air flows two-dimensionally after crossing the warm air and the cold air two-dimensionally crosses the inside of the cold air warm air layer 53 of the multilayer ventilation path 6. A partition plate (corresponding to a partition portion of the present invention) 49 is provided in the warm air passage 57 through which the warm air flows to partition in the illustrated left-right direction (the direction orthogonal to the lamination direction of the air layer).

As described above, by providing the partition plate 49 for partitioning the inside of the cool air warm layer 53 into the cool air passage 56 and the warm air passage 57, the cool air and the warm air introduced from the cool air introducing passage 41 into the cool air passage 56 are provided. The warm air flowing into the warm air passage 57 from the passage 42 collides efficiently. Thereby, the bias of the temperature distribution can be further eliminated, and the outlet temperature of the air blown out from the outlet can be made more uniform.

[Other Embodiments] In this embodiment, five single layers of cold air are used as multilayer air passages (multi-stage air layers, multi-stage air layers) 6 in which cool air and warm air are alternately flowed in a multilayer. 5
1, warm air single layer 52, cold air warm air layer 53, cold air single layer 5
4. Although the warm air single layer 55 is provided, six or more air layers may be provided as a plurality of air layers in which cold air and warm air are alternately flown in a multilayered manner. Further, two or more cool air / warm air layers through which both the cool air and the warm air flow may be provided in a plurality of air layers.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a schematic configuration of a vehicle air conditioner (first embodiment).

FIG. 2 is a schematic diagram illustrating a multilayer ventilation path of the air conditioning unit (first embodiment).

FIG. 3 is a schematic diagram illustrating a multilayer ventilation path of the air conditioning unit (first embodiment).

FIG. 4 is a graph showing a relationship between an A / M door position and an outlet temperature (first embodiment).

FIG. 5 is a schematic diagram illustrating a multilayer ventilation path of an air conditioning unit (second embodiment).

FIG. 6 is a schematic diagram showing a multilayer ventilation path of an air conditioning unit (prior art).

FIG. 7 is a graph showing the relationship between the A / M door position and the outlet temperature (prior art).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air-conditioning duct 2 Evaporator (cooling heat exchanger) 3 Heater core (heating heat exchanger) 5 A / M door (cold air / hot air distribution means) 6 Multi-layer ventilation path (multi-stage air layer) 7 Mixing part 49 Partition plate (partition part) 51 Cold air single layer 52 Warm air single layer 53 Cold air warm air layer 54 Cold air single layer 55 Warm air single layer 56 Cold air passage 57 Hot air passage

Claims (3)

[Claims] An air-conditioning duct for sending air toward a vehicle interior; a heating heat exchanger disposed in the air-conditioning duct to heat air flowing in the air-conditioning duct; An air conditioning system for a vehicle, comprising: a cold air / hot air distribution unit arranged to distribute hot air passing through the heating heat exchanger and cold air bypassing the heating heat exchanger. Has a single layer of cold air that flows only the cool air bypassing the heat exchanger for heating, and a single layer of warm air that flows only the warm air that has passed through the heat exchanger for heating. A plurality of air layers are provided so as to flow in a multilayer shape, and the plurality of air layers are provided with a cool air warm air layer through which both a cool air and a warm air flow every several stages. A vehicle air conditioner, 2. The vehicle air conditioner according to claim 1, wherein the cold air flows two-dimensionally intersect with the cool air passage and the cool air in the cool air warm air layer. An air conditioner for a vehicle, comprising: a partition for partitioning a warm air passage through which a warm air flows. 3. The air conditioner for a vehicle according to claim 1, wherein said cool air warm air layer is provided in at least one of three stages. .