JPH11254942A - Air-conditoning device for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air-conditioning device for an automobile which can prevent condensate in an evaporator from splashing, and in which the evaporator and the heater core are horizontally laid so that the air volume is increased, and noises can be reduced. SOLUTION: An air-mix door 6 having a slide door arrangement in which the door can be slide horizontally, is formed into an arcuate shape in which the door bulges out in the upward direction toward the downstream of ventilation. The distance between a heater core 4 and an evaporator 3 is regulated to a relatively long value so as to lower the wind velocity downstream of the evaporator 3 in order to prevent the condensate from splashing. Cooling fins of the evaporator 3 are arranged substantially in parallel with an air stream from a blower connecting port 2, and accordingly, the resistance to the ventilation is decreased, thereby it is possible to lower noise.

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 Some air conditioners for automobiles are disclosed, for example, in Japanese Patent Application Laid-Open No. 9-123748.
The evaporator and the heater core are horizontally arranged in order from the upstream side of the airflow introduced from the lower side into the case, and the air mix door disposed between the evaporator and the heater core is slid horizontally. There is known an air-conditioning unit that is made compact by making it possible to slide in an up-down direction.

[0003]

By configuring the air mix door as a slide door that slides horizontally as described above, the space between the evaporator and the heater core between the evaporator and the heater core can be reduced because the installation space in the vertical direction of the slide door can be reduced. As a result, the air conditioner unit can be made more compact in the vertical direction.However, when the space between the evaporator and the heater core is narrowed in this way, the slide door closes the heater core side and the bypass passage is fully opened. At the time of the cool mode, the main flow of the air passing through the evaporator tends to gather on one side of the evaporator that is biased toward the bypass passage, and the wind speed downstream of the evaporator tends to increase. Can cause.

In the above-mentioned evaporator, a plurality of refrigerant tubes for circulating the refrigerant are disposed so as to extend in the same direction as the air flow introduced from the lower side of the case. The provided cooling fin will be in a direction orthogonal to the air flow introduced from the lower side of the case, and the air flow blows against the cooling fin when flowing between the refrigerant tubes, thereby increasing the ventilation resistance, There is a possibility that the air volume of the air conditioning unit decreases and the noise increases.

SUMMARY OF THE INVENTION The present invention provides an evaporator and a heater core horizontal type air conditioner for a vehicle which can suppress water splash to the downstream side of the evaporator, increase the air volume and reduce noise.

[0006]

According to the first aspect of the present invention, the evaporator and the heater core are disposed horizontally in the case in order from the upstream side of the airflow introduced from the lower side of the case. In a structure in which an air mixing door for distributing cold air passing through the evaporator between the evaporator and the heater core to the heater core side and a bypass passage provided on a side portion of the heater core is provided, the air mixing door includes an evaporator. The slide door is formed in an arc shape bulging toward the downstream side of the passed cool air, and is slidable laterally to a position for closing the heater core side and a position for closing the bypass passage side, A cooling fin laid across a plurality of refrigerant tubes for flowing the refrigerant through the evaporator is used for airflow introduced from the lower side of the case. It is characterized in that it has arranged substantially in parallel for.

According to a second aspect of the present invention, the evaporator according to the first aspect is characterized in that the refrigerant tank is disposed in such a direction as to face the front wall of the case.

[0008] In the invention of claim 3, claims 1 and 2
Is characterized in that the evaporator described in (1) is arranged to be inclined in the front-rear direction of the case.

[0009]

According to the first aspect of the present invention, the air mix door, which is a slide door slidable in the lateral direction, is formed in an arc shape that bulges toward the downstream side of the cool air that has passed through the evaporator. Therefore, the distance between the evaporator and the heater core disposed above the evaporator can be regulated to be wider, and as a result, the main flow of the air passing through the evaporator in the full cool mode in which the bypass passage is fully opened is reduced. It is possible to prevent the wind speed downstream of the evaporator from increasing by avoiding bias toward the bypass passage side of the evaporator,
The splash of condensed water on the surface of the evaporator can be prevented.

Further, by forming the air mixing door into an arc shape bulging toward the downstream side of the cool air passing through the evaporator as described above, the cool air passing through the evaporator can be directed to the bypass passage side by this arc shape. Since the gas can be smoothly circulated to the heater core side, the airflow resistance can be reduced.

On the other hand, in the evaporator, the cooling fins between the refrigerant tubes are arranged so as to be substantially parallel to the air flow introduced from the lower side of the case. When flowing through the cooling fins, it is possible to avoid blowing against the cooling fins, thereby significantly reducing the airflow resistance. Therefore, it is possible to increase the air volume in combination with the effect of suppressing the increase in the airflow resistance in the air mix door portion. Accordingly, the output of the blower unit can be reduced as much as possible, and noise can be reduced.

According to the invention described in claim 2, according to claim 1,
In addition to the effects of the invention, since the evaporator is disposed in such a direction that the refrigerant tank is on the front wall side of the case, a piping connector can be provided directly on the refrigerant tank similarly to a general-purpose evaporator, and the refrigerant can be provided. The piping does not become long, and the piping layout can be easily performed.

According to the third aspect of the invention, in addition to the effects of the first and second aspects, the evaporator is disposed inclined in the front-rear direction of the case, so that the condensed water adhered to the evaporator. Can be caused to flow downward, and the effect of preventing condensed water from splashing can be further improved.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a case of an air conditioning unit, and a blower connection port 2 to which a blower unit (not shown) is connected is formed in a lower portion of one side wall.

In the case 1, an evaporator 3 is provided from the upstream side of the air introduced from the blower connection port 2.
And the heater core 4 are arranged horizontally in this order.

In this embodiment, the heater core 4 is disposed substantially horizontally on the front side in the case 1, the rear side of the heater core 4 is used as a bypass passage 5, and the evaporator 3 is inclined backward and downward. It is arranged.

Between the evaporator 3 and the heater core 4, the cool air that has passed through the evaporator 3 is selectively passed to the front side where it is directed to the heater core 4 or to the rear side that is directed to the bypass passage 5. An air mix door 6 for distributing air at an appropriate ratio is provided for both, and a downstream portion of the heater core 4 and the bypass passage 5 is provided as an air mix chamber 7. Is blown out from a vent outlet 8 provided on the upper wall of the case 1, a defroster outlet 9 adjacent to the front side of the vent outlet 8, or a foot outlet 10 provided on both side walls of the case 1.

The vent outlet 8, the defroster outlet 9, and the foot outlet 10 are separated by a partition 11.
The openings 12 and 13 are provided so as to communicate with each other.

A switching door 14 for controlling the opening and closing of the vent outlet 8 and the opening 12 is provided between the vent outlet 8 and the opening 12, while the defroster outlet 9 and the opening 1 are provided.
3, a switching door 15 for controlling the opening and closing of the defroster outlet 9 and the opening 13 is provided.

The switching door 14 is opened at the time of the vent mode.
And the vent outlet 8 is fully opened to rotate to the intermediate position between the vent outlet 8 and the opening 12 in the bi-level mode, and the vent outlet 8 is closed and closed in the foot mode and the defroster mode. The operation is controlled so that is fully opened.

The other switching door 15 rotates the defroster outlet 9 to a fully closed position or a position near the fully closed position in the foot mode to fully open the opening 13, and in the defroster mode, the opening 13 is fully closed to open the defroster outlet 9. The operation is controlled to open fully.

Here, the air mix door 6 is constituted by a slide door which can be slid laterally between a position where the front heater core 4 is closed and a position where the rear bypass passage 5 is closed.

The air mix door 6 is provided with the evaporator 3
A pair of front and rear pairs of guide pins 16 formed on the left and right side walls of the case 1 are formed in a circular arc shape swelling upward toward the downstream side of the cool air that has passed through, and provided on the left and right side walls of the case 1. The guide pin 16 and the guide rail 17 are slidably engaged with the arc-shaped guide rail 17.

Gears 18 are provided on the lower surfaces of both right and left edges of the air mix door 6. Gears 19 provided on a drive shaft 20 which penetrates and supports the left and right side walls of the case 1 mesh with the gears 18. Then, the drive shaft 20 is slid by rotation.

On the other hand, the evaporator 3 is disposed such that the refrigerant flow direction of the plurality of refrigerant tubes 21 and 21 for flowing the refrigerant is in the vehicle front-rear direction, that is, in the front-rear direction of the case 1. , 21 are arranged so as to be substantially parallel to the air flow introduced from the blower connection port 2 on the side wall of the case 1.

The evaporator 3 is arranged such that the refrigerant tank 23 at one end of the refrigerant tubes 21 and 21 faces the front wall of the case 1, and a piping connector 24 is protruded from the refrigerant tank 3. The piping connector 24 is arranged to protrude forward of the case 1.

According to the structure of the above embodiment, case 1
The air flow introduced from the blower connection port 2 in the lower part of the side wall is cooled by passing through the evaporator 3 from below to above, and the cool air passing through the evaporator 3 is driven by the air mix door 6 to the heater core 4 and the bypass passage 5. The air is distributed according to the mode, the temperature is adjusted in the air mixing chamber 7, and the air outlets 8,
Blow out selectively from 9 and 10.

Here, the air mixing door 6 is a sliding door slidable in the horizontal direction.
Since the air mix door 6 is formed in an arc shape swelling toward the downstream side of the cool air passing through the evaporator 3,
The evaporator 3 and a heater core 4 disposed above the evaporator 3
Can be broadly regulated, and as a result,
In the full cool mode in which the bypass passage 5 is fully opened, the main flow of the air passing through the evaporator 3 is prevented from deviating to the bypass passage 5 side of the evaporator 3 to suppress an increase in the wind speed downstream of the evaporator 3; The splash of condensed water on the surface of the evaporator 3 can be prevented.

Further, as described above, since the air mixing door 6 is formed in an arc shape bulging toward the downstream side of the cool air passing through the evaporator 3, the cool air passing through the evaporator 3 is formed by this arc shape. Since the fluid can be smoothly flown to the bypass passage 5 side or the heater core 4 side, the ventilation resistance can be reduced.

On the other hand, the evaporator 3 is arranged such that the cooling fins 22 between the refrigerant tubes 21 and 21 are substantially parallel to the air flow a introduced from the blower connection port 2 of the case 1 as shown in FIG. This arrangement prevents the introduced air flow from hitting the cooling fins 22 when flowing between the refrigerant tubes 21 and 21, thereby significantly reducing the airflow resistance. The air volume can be increased in combination with the effect of suppressing the increase in the ventilation resistance in the portion, and accordingly, the output of a blower unit (not shown) can be reduced as much as possible to reduce noise. .

Further, since the refrigerant tank 23 of the evaporator 3 is disposed in a direction facing the front wall of the case 1, a piping connector 24 is provided directly on the refrigerant tank 23 similarly to a general-purpose evaporator. The piping connector 24 can be passed through the dash panel 25 to connect the refrigerant piping on the engine room side (not shown). Therefore, the refrigerant piping does not become long and the piping layout can be easily performed.

Further, since the evaporator 3 is piped downward and inclined in the front-rear direction of the case 1, condensed water adhering to the evaporator 3 can flow downward, thereby preventing the condensed water from splashing. The effect can be further improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a cooling fin arrangement structure of the evaporator used in the embodiment.

[Explanation of symbols]

 Reference Signs List 1 case 3 evaporator 4 heater core 5 bypass passage 6 air mix door 21 refrigerant tube 22 cooling fin 23 refrigerant tank

Claims (3)

[Claims] An evaporator (3) and a heater core (4) are arranged horizontally in order from an upstream side of an air flow introduced from a lower side of the case (1), and the evaporator (3) An air mixing door (6) for distributing the cool air that has passed through the evaporator (3) between the heater core (4) and the heater core (4) and to a bypass passage (5) provided on the side of the heater core (4). ), The air mix door (6) is formed in an arc shape that bulges toward the downstream side of the cool air that has passed through the evaporator (3), and closes the heater core (4). When,
The evaporator (3) is formed by a slide door that can slide laterally to a position where the bypass passage (5) is closed, and the evaporator (3) is straddled between a plurality of refrigerant tubes (21) and (21) through which the refrigerant flows. The installed cooling fin (22)
Are arranged so as to be substantially parallel to the airflow introduced from the lower side of the case (1). 2. An air conditioner for an automobile according to claim 1, wherein the evaporator (3) is disposed so that its refrigerant tank (23) faces the front wall of the case (1). 3. The vehicle air conditioner according to claim 1, wherein the evaporator (3) is arranged to be inclined in the front-rear direction of the case (1).