JPS637526Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to an air conditioner for an automobile that can improve temperature control characteristics.

(Prior Art) Automotive air conditioners generally consist of an intake unit with a fan, a cooler unit with an evaporator, and a heater unit with a heater core. By adjusting the amount of air that passes through the cooler unit and is cooled, it changes the amount of air that passes through the heater core and becomes warm air, and the amount of air that remains cold without passing through the heater core. The air is mixed in a mixing chamber and the air at a desired temperature is discharged into the vehicle interior.

The opening degree of the mixer door is adjusted by the passenger operating a template lever provided on the instrument panel. The relationship between the operating position of the template lever and the temperature of the air discharged into the vehicle interior is ideally as shown by the broken line a in FIG. However, in reality, it often changes as shown by solid lines b or c in FIG. This is because the shape of a heater unit etc. attached to the vehicle body is subject to certain restrictions. Therefore, in order to obtain the ideal temperature control characteristics shown in Figure 1, conventionally a wind shield plate was installed between the outlet of the cooler unit and the inlet of the heater unit, and the amount of air directed toward the heater core and the amount of other air were separated. The ratio of In addition, FIG. 2 shows the wind shielding plate P, which is conventionally used to achieve ideal temperature control characteristics when the characteristics shown by c in FIG. 1 are obtained.
FIG. The temperature control characteristics are corrected by blocking the flow of air in the hatched areas in FIG.

(Problems to be Solved by the Invention) However, in such a conventional structure, since the cross-sectional area of the inlet of the heater unit is narrowed, there is a problem in that the ventilation resistance of the heater unit is increased.

The present invention aims to solve the problems of the prior art described above and to improve temperature control characteristics without increasing ventilation resistance.

"Structure of the invention" (Means for solving the problem) The structure of the invention to achieve this purpose is as follows:
An air conditioner for an automobile comprising an intake unit having a fan and a heater unit having a heater core, and a mix door is attached to the heater unit for controlling at least the amount of air passing through the heater core out of the air flowing into the heater unit. In this case, a wind direction plate is attached to the inlet of the heater unit, which is horizontal during maximum cooling and maximum heating, and tilts during other harmonic cooling and heating.

(Function) The wind direction plate is horizontal during maximum cooling and maximum heating, and is tilted during other harmonic cooling and harmonic heating. As a result, in the harmonic heating state where hot air and cold air are mixed,
Since the wind direction plate is inclined, ideal temperature control characteristics can be obtained. Furthermore, since the cross-sectional area of the air circulation portion is not narrowed, ventilation resistance is not increased.

(Example) Next, an example of the present invention shown in FIG. 3 will be described.

As shown in FIG. 3, the air conditioner for an automobile according to the present invention is comprised of an intake unit 1, a cooler unit 2, and a heater unit 3. The intake unit 1 has a built-in fan 5 driven by a motor 4, and further includes an inside air inlet 6 into which the circulation flow into the vehicle interior flows, an outside air intake 7 into which outside air flows, and an inside air inlet 6 and an outside air intake 7. The intake unit 1 is provided with an outlet 8 through which air sucked in from one or both of the two is sent out by the fan 5. Further, an intake door 9 is installed inside the intake unit 1 in order to control the air flowing into the intake unit 1 through the inside air inlet 6 and the air flowing through the outside air intake 7. The intake door 9 is in the A position where the inside air inlet 6 is closed, and the outside air intake 7 is closed.
Move to position B to close.

The cooler unit 2 into which the air from the intake unit 1 flows is formed with an inlet 10 connected to the outlet 8 of the intake unit 1, and the refrigerant from the refrigerant conduit 11 of the cooling circuit passes through the expansion valve 11a. An evaporator 12 is built into the refrigerant, and heat is exchanged between the air from the intake unit 1 and the refrigerant in this evaporator 12. The outlet 13 of the cooler unit 2 is connected to the inlet 14 of the heater unit 3, and the air cooled within the cooler unit 2 flows into the heater unit 3.

Inside the heater unit 3 is a heater core 15 through which engine cooling water flows through a valve (not shown) in order to heat the air that has flowed into the heater unit.
A mixer door 16 is installed in the heater unit 3 upstream of the heater core 15 to adjust the amount of air flowing into the heater core 15 and the amount of air bypassing the heater core. This mixer door 16 is in the open position (D position),
By actuating the closed position (C position) or any intermediate position between these, such as the E position,
All the air that has flowed into the heater unit 3 is sent into the vehicle interior through the heater core 15,
Either air is sent directly into the vehicle interior without passing through it, or some air is passed through the heater core 15 and other air is allowed to flow down without passing through the heater core 15, and then both of these airs are mixed and sent into the vehicle interior. The air is sent into the passenger compartment from different outlets without mixing or mixing.

A mixing chamber 17 is formed downstream of the heater core 15, and the mixing chamber 17 includes a differential duct 18 for guiding air from the heater unit 3 and blowing it out along the inner surface of the windshield, and a differential duct 18 for blowing air out from the heater unit 3 along the inner surface of the windshield. A floor duct 19 for blowing air toward the driver's seat and a vent duct 20 for sending air into the vehicle interior from a center ventilator (not shown) assembled to the instrument panel in front of the driver's seat are open. Furthermore, as shown in FIG. 4, there is a differential door 21 for controlling the air distribution to the differential duct 18, a vent door 22 for controlling the air distribution to the vent duct 20, and a floor duct 19 for controlling the air distribution. floor door 2
3 are installed in the heater unit 3, respectively.

The air conditioner is set to each mode by opening and closing these various doors. That is, in the vent mode, the vent door 22 is fully opened, and the differential door 21 and floor door 23 are fully closed.
In the bi-level mode, the vent door 22 and floor door 23 are half-opened, and the differential door 21 is fully closed. Furthermore, in the heater mode, the vent door 2
2 is fully closed, the floor door 23 is fully open, and the differential door 21 is half open. Further, in the differential mode, the vent door 22 and the floor door 23 are fully closed, and the differential door 21 is fully opened. A wind direction plate 24 is rotatably attached to the inlet portion 3a of the heater unit 3, and the tip of this wind direction plate 24 reaches close to the evaporator 12.

By changing the inclination of the wind direction plate 24, the air that has passed through the evaporator 12 is directed to the heater core 15.
or heater core 1.
It becomes possible to provide guidance to avoid 5.

When the mix door 16 is in the C position, that is, at maximum heating where all the air flowing into the heater unit 3 is guided to the heater core 15, or when the mix door 16 is in the D position.
In the maximum cooling position, in which all the air flowing into the heater unit 3 is directly guided into the vehicle interior without passing through the heater core 15, the wind direction plate 24 is oriented horizontally as shown by the broken line in FIG. As a result, the air leaving the evaporator 12 flows into the heater unit 3 almost horizontally. Therefore, there is no air resistance and no reduction in air volume. Next, when the mixer door 16 is in a position other than the maximum cooling position, that is, in a harmonized cooling state in which hot air and cold air need to be mixed, the air direction plate 24 is tilted. At this time, when each door is set to the vent mode state in which air is discharged from the vent duct 20 into the vehicle interior, a large amount of air can be directed to the heater core 15 by tilting the wind direction plate 24 as shown by the solid line in FIG. can be guided by. As a result, ideal temperature control characteristics as shown by the broken line a in FIG. 1 can be obtained.

Even when the mixer door 16 is set to a position other than the maximum heating position in the heater mode state in which air is discharged from the floor duct 19 into the vehicle interior, that is, each door is set to a harmonized heating state in which hot air and cold air need to be mixed. By tilting the wind direction plate 24 as shown by the solid line in FIG. 3, ideal temperature control characteristics can be obtained.

In addition, when each door is set to the bilevel mode, it is generally better to separate the cold air from the vent duct 20 and the warm air from the floor duct 19 and blow them into the passenger compartment, so the wind direction plate is horizontal. Good direction. In order to do this, it is linked to each mode state, and in the vent mode state and heater mode state, when the mixer door 16 is at the maximum cooling position and the maximum heating position, the wind direction plate is horizontal, and when the mixer door 16 is in the maximum cooling position or maximum heating position, the wind direction plate is horizontal, and when the mixer door 16 is in the maximum cooling position or the maximum heating position, Tilt in heating conditions. In other modes,
The wind direction plate 24 is kept in a horizontal position.

In FIG. 3, when the wind direction plate 24 is tilted upward as shown by the solid line to improve the temperature control characteristics, this is the case where the temperature control characteristics are improved as shown by the solid line c in FIG. . On the other hand, in the case where the temperature control characteristic is as shown by the solid line b in FIG. 1, in order to improve the temperature control characteristic, in FIG.
so that it is tilted. The angle of inclination of the wind direction plate 24 is determined in consideration of temperature control characteristics so as to have ideal characteristics.

As described above, according to the present invention, the intake unit includes an intake unit having a fan, a cooler unit having an evaporator, and a heater unit having a heater core. In an automobile air conditioner in which a mix door is attached to the heater unit, the air direction plate is horizontal during maximum cooling and maximum heating, and is inclined at other times such as harmonized cooling and heating. By installing the heater unit, it is possible to improve the temperature control characteristics without increasing the ventilation resistance of the heater unit.

[Brief explanation of the drawing]

Figure 1 is a graph showing the temperature control characteristics of an automotive air conditioner, Figure 2 is a front view of a conventional wind shield,
FIG. 3 is a sectional view showing an embodiment of the present invention, and FIG. 4 is a sectional view taken along the - line in FIG. 1... Intake unit, 2... Cooler unit, 3... Heater unit, 12... Evaporator, 16... Mix door, 24... Wind direction plate.

Claims (1)

[Scope of utility model registration request] An air conditioner for an automobile, comprising an intake part having a fan and a heater unit having a heater core, and a mix door for controlling at least the amount of air passing through the heater core out of the air flowing into the heater unit is attached to the heater unit. An air conditioner for an automobile comprising a wind direction plate attached to the inlet of a heater unit, which is horizontal during maximum cooling and maximum heating, and tilted during other conditioned cooling and heating.