JPS6343129Y2 - - 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 is designed to improve temperature control characteristics.

(Prior Art) In general, an air conditioner for an automobile includes an intake unit 1, a cooler unit 2, as shown in FIGS.
It is composed of a heater unit 3. The intake unit 1 has a built-in fan 5 driven by a motor 4, and is further provided with an inside air inlet 6 through which a circulation flow into the vehicle interior flows and an outside air intake 7 through which outside air flows. Also, inside the intake unit 1, there is a position A that closes the inside air inlet 6 and an outside air intake 7.
An intake door 8 is attached which opens and closes between the closed position B and the closed position B.

The cooler unit 2 into which air from the intake unit 1 flows has a built-in evaporator 11 into which the refrigerant from the refrigerant conduit 9 of the cooling circuit is depressurized through an expansion valve 10 and flows into it. Heat is exchanged with the refrigerant. A heater core 12 is built into the heater unit 3, into which engine cooling water flows through a valve (not shown) in order to heat the incoming air. A mix door 13 is installed to adjust the ratio between the amount of air and the amount of air passing through the bypass passage 24 that bypasses the heater core 12 and guides the air. This mix door 13 is in the open position (C position),
By actuating the closed position (D position) or any intermediate position between these, e.g. E position,
All of the air that has flowed into the heater unit 3 is sent into the vehicle interior through the heater core 12, or some of the air is passed through the heater core 12 and other air is passed through the bypass passage 24, and then mixed and sent into the vehicle interior. Alternatively, the air is sent into the passenger compartment from several outlets without mixing.

A mixing chamber 14 is provided downstream of the heater core 12.
The mixing chamber 14 includes a differential duct outlet 15 that blows air from the heater unit 3 through a differential duct (not shown) along the inner surface of the windshield, and a differential duct outlet 15 that blows air toward the feet of the passenger. A foot duct air outlet 16 and a vent duct air outlet 18 for sending air into the vehicle interior through a vent duct 30 from a ventilator provided in an instrument panel in front of the driver's seat are open. This vent duct 30 has the first to
As shown by the two-dot chain line in Figure 2, the air outlet 18
After extending upward from there, it branches into left and right sides 30a and 30b, and is connected to the respective ventilators on the driver's seat side and the passenger's seat side in the vehicle interior. or,
A differential door 19 that controls the air distribution of the air outlet 15 for the differential duct, a vent door 20 that controls air distribution of the air outlet 18 for the vent duct, and an air outlet 16 for the foot duct
A foot door 21 is installed inside the heater unit 3 to control the air distribution.

As shown in FIG. 1, such an air conditioner for an automobile has a differential duct outlet 15 at the top.
There is one in which a foot duct outlet 16 is provided at the bottom.

In this type of automobile air conditioner, when performing a differential foot mode (defogging footwell heating) that heats the feet of the occupants and leaks a portion of the warm air to defog the windshield. ,
The mixer door 13 is mainly moved to an intermediate position from the C position to the E position.

In this case, most of the warm air that has passed through the heater core 12 flows into the foot duct outlet 16 located at the bottom, creating an excessive temperature difference between the differential and the foot (according to experiments, this temperature difference is about 40 to 50 degrees Celsius). ) and the driver's upper body becomes cold or DEMIST
(Defogging) Problems such as lack of effectiveness had arisen.

As a countermeasure against such a problem, it has been proposed to provide a hot air guide duct 23 in the heater unit 3 as shown in FIG. 1 (see Japanese Utility Model Application Laid-Open Publication No. 58-99114).

The hot air guide path 23 in this automotive air conditioner is configured to guide a part of the warm air that has passed through the heater core 12 to the def duct outlet 15. The opening 25 is located near the warm air blowing part of the heater core 12, and the blowing outlet 26 is located near the warm air blowing part of the heater core 12.
They each open near the air outlet 15 for the def duct.

(Problem to be solved by the invention) However, in such an air conditioner for an automobile, in the differential foot mode, part of the warm air that has passed through the heater core 12 is guided to the differential duct outlet 15, This can compensate for the excessive temperature difference between the differential and foot, but on the other hand,
There are some inconveniences in modes other than foot mode.

For example, in the vent mode which requires air mixing, a problem as shown in FIG. 8 occurs. This figure is a conceptual diagram showing the state of inflow of cold air and hot air into the vent duct outlet in vent mode and the harmonious state of cold air and hot air in the vent duct.The thickness of the arrow on the figure indicates the air volume. It represents the amount of

That is, a portion H1 of the hot air H that has passed through the heater core 12 is guided upward into the heater unit 3 through the hot air guide path 23, and is evenly vented from the upper part of the vent duct outlet 18. is guided into the duct 30, while the vent duct outlet 1
8, only the remaining warm air (H2+H3) that does not pass through the hot air guide path 23 contributes to the air mix. Since the air guide path 23 is formed along the side wall surface of the heater unit 3, it acts as a ventilation resistance for the hot air H2 that tends to flow into the vent duct outlet 18, particularly to the right side in the figure. Therefore, the remaining hot air (H2 + H3) that does not pass through the hot air guide path 23 is formed on the left and right sides of the lower part of the vent duct outlet 18, with a large amount of hot air H3 on the left side in the figure and a small amount on the right side. warm air H2
will flow. In this way, when an imbalance occurs in the amount of inflowing hot air on the left and right sides of the lower part of the vent duct outlet 18, the right side in the figure where the amount of inflowing hot air is smaller becomes negative pressure compared to the left side, and this pressure difference is alleviated. Therefore, a situation arises in which a large amount of the cold air C2 that passes through the upper part of the heater unit case 3 and attempts to flow into the upper part of the vent duct outlet 18 flows into the negative pressure part. Then, when passing through the vent duct 30, a difference occurs in the mixing ratio of the air volume between the cold air C and the hot air H on the left and right sides of the vent duct, and in this state, the driver's seat side vent duct 30a and the passenger seat side Since the vent duct 30b branches into the side vent duct 30b, the temperature of the air blown from the left and right sides of the ventilator provided in the instrument panel becomes uneven.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide an air conditioner for an automobile that has excellent temperature control characteristics in any mode.

[Structure of the invention] (Means for solving the problem) In order to achieve the above object, the invention provides a mix door that switches and controls the air passing through the heater core in the heater unit and the air bypassing the heater core. provided on the upstream side of the heater core, a defer duct outlet at the upper part of the downstream side of the heater core, a foot duct outlet at the lower part near the downstream side of the heater core, and the defer duct outlet and the foot duct outlet on the downstream side of the heater core. In an air conditioner for an automobile, a vent duct outlet is provided in the middle of the vent duct, and a hot air guide path is provided that communicates the differential duct outlet with a vicinity of the downstream side of the heater core. A bypass port for blowing out hot air is provided in the warm air guide path, and a door for opening and closing the outlet of the warm air guide path is connected to a differential door that opens and closes the outlet for the def duct. It is something.

(Function) By doing this, the temperature difference between the differential and the foot will not become excessive during the differential/foot mode.
Not only does this solve problems such as the driver's upper body and knees getting cold, but warm air can be blown from the bypass port installed in the hot air guide path to the vent duct outlet, making it possible to This ensures uniformity of the air blown into the passenger compartment from the ventilator.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a schematic longitudinal sectional view of an air conditioner for an automobile according to the present invention, FIG. 4 is a sectional view taken along the line -- in FIG. 3, and FIG. 5 is a schematic perspective view showing a hot air guide path according to the present invention. , FIG. 6 is a perspective view of an internal wall forming a hot air guide path according to the present invention, and the same members as those shown in FIGS. 1 and 2 are given the same reference numerals.

As shown in FIG. 3, the hot air guide path 23a according to the present invention is different from the conventional hot air guide path 23a shown in FIG.
Similarly, the suction port 25 is located near the warm air blowout part of the heater core 12, and the blowout port 26 is located near the blowout port 1 for the def duct.
Each opening is near 5.

However, unlike the conventional hot air guide path 23 described above, the hot air guide path 23a has a bypass port 28 in the middle of the path that blows out hot air to the vent duct outlet 18. As shown in FIG. 4, the bypass port 28 is opened and closed by the lower one of the pair of vent doors 20, 20.

Here, since the vent doors 20, 20 are closed in the heater mode and the differential mode, and are opened in directions away from each other in the vent mode, the bypass provided corresponding to the lower vent door 20 The mouth 28 will also be opened and closed accordingly.

Further, the outlet 26 of the hot air guide path 23a is provided with a door 19a connected to a differential door 19 that opens and closes the outlet 15 for the differential duct.

Furthermore, the shape of the internal wall 27a for forming the warm air guide path 23a is designed to minimize the ventilation resistance of the air flowing inside the heater unit 3, as shown in FIGS. It is formed in a shape that makes the volume as large as possible. That is, the shape of the internal wall 27a is such that, as shown in FIGS. 5 and 6, a portion of the warm air that has passed through the heater core 12 is sucked in through the suction port 25 provided on the bottom surface of the heater unit 3, and the warm air is Along the side wall surface of the heater unit 3, passing near the vent door 20, the air outlet 26 near the differential air outlet 15 provided on the upper surface of the heater unit 3 is connected.
It has a convenient shape for blowing out. Moreover, the shape of the internal wall 27a is formed into a smooth curved surface so that the ventilation resistance of the air flowing between the inside and the outside thereof is as small as possible. In particular, the curved surface portion 29 is made as smooth as possible,
This is to prevent cold air bypassing the heater core 12 from colliding with the internal duct 27a and increasing ventilation resistance.

Next, the operation of this embodiment will be explained.

When the above-mentioned automobile air conditioner is set to the differential foot mode, the vent door 20 is closed, and the differential door 19 and the foot door 21 are opened, a portion of the warm air that has passed through the heater core 12 is discharged from the suction port 25. The hot air flows into the hot air guide path 23a, passes through the hot air guide path 23a, is blown out from the outlet 26, and is discharged from the def duct outlet 15 together with the air that has bypassed the heater core 12. Further, the remainder of the warm air that has passed through the heater core 12 is mixed with the detour air described above and passes through the opening of the opened foot door 21 to the air outlet 1 for the foot duct.
It is discharged from 6.

According to experiments, the temperature of the air discharged from the foot duct is lower than the temperature discharged from the def duct.
The temperature is 10 to 20 degrees higher. Furthermore, compared to the temperature difference of the conventional system mentioned above (approximately 40 to 50 degrees Celsius), the temperature difference can be significantly reduced, allowing the driver of the car to enjoy a comfortable differential foot mode. .

FIG. 7 is a characteristic diagram of the automotive air conditioner according to the present invention, in which the horizontal axis represents the opening state of the mixer door 13, and the vertical axis represents the approximate temperature of the air blown out from the foot duct or the differential duct. There is. In the figure, F/C indicates a fully cooled state, and the third
This corresponds to the state in which the mix door 13 is set at position D in the figure, F/H indicates a full hot state, and the mix door 13 is set in position C in Fig. 3.
This corresponds to the state where 3 is set.

In this figure, the relationship between the mix door setting position and temperature when the automotive air conditioner according to the present invention is set to differential foot mode is shown by a solid line, and the conventional example when a hot air guide path is not provided is shown. is shown by the dotted line. As is clear from this figure, according to the present invention, it is possible to correct an excessive temperature difference between the differential and the foot in the differential foot mode.

Furthermore, when the mode is set to a mode other than the differential/foot mode, for example, the vent mode, the differential door 19 and the foot door 21 are closed, so the conventional warm air guide path 23 does not perform its original function; When the mixer door 13 is moved to an intermediate position, it obstructs the flow of warm air flowing out from the lower right side of the vent duct outlet 18 through the heater core 12, and the temperature at the opening surface of the vent duct outlet 18 becomes obstructed. This deteriorates the uniformity of the distribution in the left-right direction, and in turn deteriorates the uniformity of the temperature blown out from the ventilator of the instrument panel (air mix). In the present invention, a bypass port 28 is provided in the hot air guide path 23a, and when the vent door 20 is opened, the bypass port 28 is also opened, so that a part of the warm air that has passed through the heater core 12 is transferred to the suction port 25. Since the hot air enters through the hot air guide path 23a and flows out from the bypass port 28 to the lower right side of the vent duct outlet 18, the hot air guide path 23a itself is similar to the conventional hot air guide path 23 and flows out from the heater core 12. The flow of warm air flowing out from the lower right side of the vent outlet 18 through the vent outlet 18 is not obstructed, and it is possible to maintain the uniformity of the temperature distribution in the left-right direction on the opening surface of the vent duct outlet.

Furthermore, when the bilevel mode (head cold, foot heat heating) is selected, the differential door 19 is closed, so
The outlet 26 of the hot air guide path 23a is closed by the door 19a, and all the warm air introduced into the hot air guide path 23a flows from the bypass port 28 to the vent duct outlet 18. In this case as well, it is possible to maintain the uniformity of the temperature distribution in the left-right direction on the opening surface of the vent duct outlet, as in the case described above.

In addition, an internal wall 27 forming a hot air guide path 23a
Since the shape of "a" uses a curved surface as much as possible, the ventilation resistance of the air flowing inside the heater unit 3 is not increased.

[Effects of the invention] As described above, according to the invention, a bypass port for blowing hot air to the vent outlet is provided in the hot air guide path that communicates the def duct outlet and the vicinity of the downstream side of the heater core, and Since the differential door that opens and closes the outlet for the differential duct is connected to the door that opens and closes the outlet of the hot air guide path, the temperature difference between the differential and the foot does not become excessive during the differential/foot mode, and the driver Problems such as coldness of the upper body and knees are resolved, and a comfortable air blowing condition is maintained except when in the differential foot mode.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a conventional automobile air conditioner, FIG. 2 is a sectional view taken along the line - in FIG. 1,
FIG. 3 is a schematic cross-sectional view of an air conditioner for an automobile according to the present invention, FIG. 4 is a cross-sectional view taken along the line -- in FIG. 3, and FIG. 5 is a schematic perspective view showing a hot air guide path according to the present invention. FIG. 6 is a perspective view of an internal wall forming a hot air guide path according to the present invention, FIG. 7 is a characteristic diagram of an automotive air conditioner according to the present invention, and FIG. 8 is an automotive air conditioner according to a conventional example. It is a conceptual diagram explaining the flow of air of a conditioner. DESCRIPTION OF SYMBOLS 1...Intake unit, 2...Cooler unit, 3...Heater unit, 12...Heater core, 13...Mix door, 15...Diff duct outlet, 19...Differential door, 19a...Door,
20...Vent door, 21...Foot door, 23
a... Hot air guide path, 25... Inlet, 26... Outlet, 27a... Internal wall, 28... Bypass port.

Claims (1)

[Claims for Utility Model Registration] (1) A mix door for switching and controlling the air passing through the heater core in the heater unit and the air bypassing it is provided on the upstream side of the heater core, and a differential air blower is provided on the upper downstream side of the heater core. A foot duct outlet is provided at a lower part near the downstream side of the heater core, and a vent outlet is provided between the differential duct outlet and the foot duct outlet on the downstream side of the heater core. In an air conditioner for an automobile, the air conditioner is provided with a warm air guide path that communicates with the vicinity of the downstream side of the heater core, and a bypass port for blowing hot air to the vent duct outlet is provided in the hot air guide path; . An air conditioner for an automobile, characterized in that a door for opening and closing the outlet of the warm air guide path is connected to the differential door that opens and closes the outlet for the differential duct. (2) The air conditioner for an automobile according to claim 1, wherein the bypass port is opened and closed by a vent door that opens and closes the vent duct air outlet. (3) Utility model registration claim 1, in which the internal wall forming the hot air guide path is shaped to have as many curved surfaces as possible so as to reduce the flow resistance of the air flowing inside the heater unit. The automotive air conditioner described in .