JPS6233609Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner for an automobile, and more particularly to improving the temperature characteristics of the blowing air in a heater unit in which a differential duct is provided in the upper part and a floor duct is provided in the lower part.

As a conventional air conditioner for automobiles,
55-129810 and as shown in FIGS. 1 and 2. The illustrated automobile air conditioner includes an intake unit 1 and a cooler unit 2.
and a heater unit 3. The intake unit 1 includes a fan 5 driven by a motor 4.
is built-in, and is further provided with an inside air inlet 6 through which the circulation flow in the vehicle interior flows and an outside air intake 7 through which outside air flows. An intake door 9 is installed within the intake unit to switch and control air flowing into the intake unit 1 through the inside air inlet 6 and air flowing through the outside air intake 7. This intake door 9 is an inside air inlet 6
position A, which closes the outside air intake port 7; position C, which closes the outside air intake port 7;
Then, it moves to position B between these.

The cooler unit 2 into which air from the intake unit 1 flows has a built-in evaporator 12 in which refrigerant is circulated through a refrigerant conduit 11.
Intake unit 1 inside this cooler unit 2
After the air introduced from the heater unit 3 is cooled,
flow inside.

Inside this heater unit 3 is a cooler unit 2.
A heater core 16 is installed in which engine cooling water is circulated by a conduit 15 in order to heat the air passing through it. A mixer door 17 is attached to the entire surface of the heater core 16, and by setting the mixer door 17 to any position between the F position and the D position (for example, the E position), the air that has passed through the cooler unit 2 is directed away from the heater core 16. Alternatively, some of the air from the cooler unit 2 may pass through the heater core 16 and other air may avoid the heater core, and then the air may be mixed to produce air at an appropriate temperature. and send it to the inside of the car.

The heater unit 3 includes a defrost duct 19 for blowing air from inside the heater unit 3 along the inner surface of the windshield, and a floor duct 20 for blowing air toward the feet of the tower occupants inside the vehicle. and an instrument duct 21 for blowing air into the vehicle interior from a vent outlet provided in the instrument panel. A differential door 22, a floor door 23, and a vent door 24 are each attached. In particular, in this heater unit 3, the differential duct 19 is located at the upper part, and the floor duct 2 is located at the upper part.
0 is provided at the bottom.

However, these various doors 17, 22, 2
3 and 24 are controlled according to the position of the mode setting lever and template lever of the controller provided on the instrument panel in front of the driver's seat.
This is done via operating force transmission cables, negative pressure actuators, etc., and depending on the opening/closing status of each door 22, 23, 24, hot air is divided by the mixture door 17 and heated by the heater core 16, and cold air is bypassed. are mixed in the air mixture chamber 18 or not, and the mixture is mixed in the air mixture chamber 18,
Speech from 21 as appropriate.

However, in such conventional automobile air conditioners, the differential duct is provided in the upper part near the cold air path of the heater unit, and the floor duct is provided in the lower part near the hot air path of the heater unit. When in bilevel mode, which provides heating for cold heads and feet, hot air flows more easily into the floor duct, and as shown in Figure 3, the temperature characteristics of the air blown from the floor duct and the temperature of the air blown from the vent duct are improved. However, when in heat mode, hot air flows excessively into the floor duct and cold air flows into the differential duct.
As shown in Figure 4, the temperature of the air blown from the floor duct tends to increase, while the temperature of the air blown from the def duct tends to decrease, causing a problem in that the defrosting effect in heat mode decreases. .

The present invention has been made in view of these conventional problems, and aims to solve the above problems by providing a hot air guide path for replenishing hot air in the def duct.

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

FIGS. 6 and 7 are views showing one embodiment of the present invention, and in particular only the heater unit thereof is shown. Inside this heater unit 3, a heater core 16 that heats the air is installed across the front and back direction, and a mix door 17 that controls the amount of air passing through the two heater cores and the amount of air that bypasses this is also installed inside the heater unit 3. It is being Also,
Inside the heater unit 3, there is a mixing device for mixing the warm air that passes through the heater core 16 and is blown out to the bottom of the heater unit 3 with the cold air that is blown out to the top of the heater unit 3 without passing through the heater core 16. A mixture chamber 18 is formed.

A def duct 19 and a floor duct 20 are provided in the heater unit 3 so as to communicate with the upper part of the mixing chamber 18, and the floor duct 20 with the lower part of the mixing chamber 18, respectively. A hot air guide path 25 is integrally formed in the heater unit 3, and the suction port 25A of the hot air guide path 25 is near the hot air blowing surface of the heater core 16, and the blowing outlet 25B is connected to the defer duct 19. They each open near the suction port. An air guide passage opening/closing part 26 for opening and closing the warm air guide passage 25 is integrally extended at one end of the differential door 22 having a butterfly damper structure. When the inlet of the def duct 19 is closed, the outlet 25 of the hot air guide path 25
It is designed to open when B is closed and opened.

Next, the effects will be explained.

In the heat mode, the floor door 23 opens the floor duct 20, and the differential door 22 opens the differential duct 19.
to open. Therefore, the air guide path opening/closing section 26 also opens the hot air guide path 25. A portion of the hot air heated by passing through the heater core 16 flows into the floor duct 20 and a portion of it flows into the differential duct 19 through the air mix chamber 18, but the hot air guide path 25 is also opened. Therefore, a part of the air flows into this air guide path 25 from the suction port 25A. The warm air in the air guide path 25 is blown out from the outlet 25B toward the differential duct 19, merges with the warm air that has arrived here through the air mix chamber 18, and flows into the differential duct 19.

In this way, since the hot air guided by the air guide path 25 is supplementally supplied to the differential duct 19, the temperature of the air blown from the differential duct 19 increases by the amount of the supplemented air. On the other hand, since the hot air flowing into the floor duct 20 is reduced by the amount collected in the air guide path 25, the temperature of the air blown from the floor duct 20 is suppressed by this reduction. Therefore, the temperature characteristics of the air blown from both ducts 19 and 20 are as follows:
As shown in the figure, the temperature difference between the two is improved to a maximum of 10°C to 15°C. The temperature characteristics shown in FIG. 7 are approximately equal to the ideal temperature characteristics.

Since the differential door 22 is closed in the bilevel mode, the air guide path opening/closing section 26 also closes the hot air guide path 25. Therefore, the hot air that has passed through the heater core 16 does not flow into the air guide path 25, and the amounts of hot air that flow into the floor duct 20 and the vent duct 21 are the same as in the conventional case. This results in
Air blowing from floor duct 20 and vent duct 2
The temperature characteristics with respect to the air blown out from No. 1 are the same as in the conventional case as shown in FIG. 3, and almost ideal temperature characteristics can be maintained.

As explained above, according to the present invention, a hot air guide path is provided to supplementally guide hot air to the differential duct, and the opening and closing of this air guide path is linked to the opening and closing of the differential duct. The effect is that the temperature characteristics of the defrost in the differential mode can be improved while maintaining the effect of keeping the head cold and feet warm.

[Brief explanation of the drawing]

Figures 1 and 2 are a partially cutaway front view and cross-sectional view of a conventional example, Figure 3 is a temperature characteristic diagram of outlet air in bi-level mode, and Figure 4 is a temperature characteristic diagram of outlet air in heat mode. Diagram, 5th
7 to 7 show one embodiment of the present invention, FIG. 5 is a front cross-sectional view showing a heater unit of the automobile air conditioner, and FIG. 6 is a side cross-sectional view taken along the - line in FIG. 7 are blowout air temperature characteristic diagrams in the heat mode. 3... Heater unit, 16... Heater core,
17...Mix door, 18...Air mix chamber, 19...Diff duct, 20...Floor duct, 21...Vent duct, 22...Diff door, 23...Floor door, 24...Vent door,
25... Warm air guide path, 26... Air guide path opening/closing part.

Claims (1)

[Scope of utility model registration request] A heater core that heats the air across the heater unit in the front-rear direction, and a mix door that controls the amount of air passing through the heater core and the amount of air bypassing the heater core are provided. A mixing chamber is formed in the heater unit to mix hot air blown out with cold air blown out onto the upper part of the heater unit without passing through the heater core, and an upper part of the mixing chamber is formed above the heater unit. In an air conditioner for an automobile, a floor duct is provided in a lower part of the heater unit to communicate with the lower part of the mixing chamber, and a floor duct is provided in the lower part of the heater unit to communicate with the lower part of the mixing chamber. A hot air guide path communicating with the differential duct is provided in the heater unit, and an air guide path opening/closing part for closing the air guide path when the differential duct is closed is provided in the differential door for opening and closing the defer duct. Features of automotive air conditioning equipment.