JPS6271717A - Air conditioner for car - Google Patents

Abstract

PURPOSE:To improve the comfortableness in wiping the cloudiness by installing a duct so that warm air is blown out to the vicinity of a driver's feet, bypassing an evaporator, and allowing said warm air to blow out simultaneously from a warm-air blow-out port and a defroster blow-out port in the diff heater mode. CONSTITUTION:In the diff mode, a damper 21 is operated to the L-position, and dampers 20 and 22 are operated to the K and N-positions, respectively, and a heat blow-out port 13 and a defroster blow-out port 15 are opened. Interlocked with the above-described opening, dampers 16-19 are operated to the F, D, and H-positions. An air mixing damper 19 is arbitrarily set within the range free from the contact with the damper 17. Therefore, a portion of the air in a duct 8 is introduced into a bypass duct 11, and the rest is introduced into an evaporator 9. The air in the bypass duct 11 is heated by a heater core 11, and blown out from the heat blow-out port 13. With such constitution, warm air is blown out to the vicinity of a driver's feet even in wiping the cloudiness, and comfortableness can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air conditioner for automobiles that has an improved defrost mode for blowing air toward window glass.

[Conventional technology]

One end of the duct has an inside/outside air switching box, and the other end has a defroster outlet, a heat outlet, and a vent outlet into the vehicle interior.Inside the duct, there is an evaporator that cools the air and makes it into cold air. In a conventional automobile air conditioner equipped with a heater core disposed downstream that heats the air to create warm air, and an air damper that regulates the warm air passing through the heater core, the windshield is normally heated during winter heating. If cloudy weather occurs, the solution is to use dehumidifying heating in defroster mode or heat mode. This is because the air sucked in from the inside/outside air switching box is cooled by an evaporator until it reaches the dew point temperature, and the water vapor contained in the air condenses to form dew and become dry air. The dry air is then heated by the heater core and turned into warm air, which is blown out from the heat outlet and the defroster outlet to lower the dew point temperature in the vehicle interior and remove or prevent fogging.

[Problem that the invention seeks to solve]

However, in the conventional system described above, since the cold outside air in winter is further cooled and dried in an evaporator and then heated in a heater core, the heating capacity during dehumidification is extremely low. In addition, when the outside temperature is even lower, or in the case of a low heat source vehicle such as a diesel car, the heating capacity will be even lower, so in order to ensure visibility, it is necessary to set the defroster mode to the defroster outlet at the expense of heating the occupants. There was a problem in that the air underfoot was extremely cold and uncomfortable due to the large amount of air being blown out.

Therefore, an object of the present invention is to remove or prevent fogging from the window glass while still supplying sufficient warm air to the feet, thereby improving the feeling of heating.

[Means for solving problems]

Therefore, in order to achieve the above object, the present invention provides a first duct that has an air intake port on one end side and at least a defroster outlet that blows air toward the window glass on the other end side; ) an evaporator provided in the first duct to cool the blown air; and (c) a second duct provided to bypass the evaporator and having a heater outlet at its outlet end that opens to the feet of the occupant. a heater core disposed in both the first duct and the second duct to heat the blown air; a heater core that opens and closes the heater outlet and the defroster outlet; an air outlet switching damper means that can set a differential/heater mode for simultaneously blowing air from the air outlet;
A technical measure is adopted in which a second duct opening/closing damper means is provided to open the second duct in the heater mode.

[Action and effect]

According to the above technical means, by providing the second duct that bypasses the evaporator and the damper for opening and closing the second duct, in the differential heater mode, the air introduced into the second duct that bypasses the evaporator is directly transferred to the heater core. It can be heated and blown out from the heat outlet. Because it bypasses the evaporator, it passes through the heater core without being cooled, is heated, and is blown out from the heat outlet, so it is warmer than the warm air that passes through the evaporator, is cooled, is heated by the heater core, and is blown out from the vent outlet or defroster outlet. It is also possible to obtain hot air with a higher temperature than that which is not cooled by the evaporator.

Furthermore, since the air is not dehumidified by the evaporator, humid warm air can be obtained. This humid warm air has the effect of raising the perceived temperature, that is, the sensible temperature, more than the actual temperature, so the feeling is even better.

- Furthermore, since air that has passed through the evaporator 9, been dehumidified and cooled, and further heated by the heater core 10 is blown out from the defroster outlet, it is possible to remove and prevent fogging from the window glass.

As explained above, by simply providing a second duct that bypasses the evaporator and a second duct opening/closing damper, the present invention removes and prevents fogging from window glass, while still providing a sense of temperature at the feet of the occupants that is higher than the actual temperature. You can set a differential heat mode that can supply warm air with temperature and humidity.

FIG. 1 shows an automotive air conditioner according to a first embodiment.

Reference numeral 1 denotes an inside/outside air switching box which has an inside/outside air switching damper 2 built therein, and the damper 2 is used to selectively open and close an inside air intake port 3 and an outside air intake port 4. A blower 5 includes a blower casing 6 that is integrally assembled to the lower part of the inside/outside air switching box 1, a motor 7a, and a syringe blower b driven by the motor 7a. 8 is a main duct which is the first duct, and has the above-mentioned internal/external air switching box l and the blower 5 at one end, a vent outlet and a defroster outlet at the other end, and a car engine in the middle. The refrigeration cycle evaporator 9 has a built-in compressor driven by a refrigeration cycle.

A bypass duct 11 is a second duct provided in parallel with the main duct 8 and bypassing the evaporator 9. The bypass duct 8 and the evaporator 9 are communicated at an upstream portion thereof through an opening 11a. This opening 11a is provided with a damper 16 that is set at positions E and F in the figure and opens and closes the opening txa4.

Note that the bypass duct 11 and the main duct 8 are connected to the partition wall 1.
2a and 12b. Bypass duct 11
The upstream end has the opening 11a, and the downstream end has a heater outlet.

10 is a heater core whose heat source is the cooling suction of an automobile engine, and is provided so as to be located in a part of the main duct 8 and in both roads in the bypass duct 11, and dampers 17 and 18 are provided on the heat exchange surface. Auxiliary partition walls 23 and 24 are provided for setting the position and for ensuring reliable isolation between the main duct 8 and the bypass duct 11.

Reference numeral 13 denotes a heat outlet that blows air toward the occupant's feet, and is provided so as to open on the driver's seat side and the passenger seat side. This heat outlet 13 is an outlet switching damper, and is opened and closed by a damper 20 set at position J in the figure.

Reference numeral 14 denotes a vent outlet, which blows air toward the upper body of the occupant through a three-way branch duct (not shown), and is usually provided at three locations in the center of the upper part of the instrument panel of an automobile, and on the left and right sides. This vent outlet is opened and closed by a damper 21 set at position M in the figure. Reference numeral 15 denotes a defroster outlet, which blows air toward the front windshield of the automobile through a defroster duct (not shown).Normally, it is installed at several locations on the top surface of the instrument panel and adjacent to the windshield. There is. This defroster outlet is an outlet switching damper, and is opened and closed by dampers 22 set at positions N and O in the figure.

Furthermore, the dampers 17 and 18 are dampers for opening and closing the second duct, and are used to connect the main duct 8 upstream and downstream of the heater core 10.
and a fulcrum 17 along one partition wall 12 of the bypass duct 11
a, 18a are provided and rotate to open and close the bypass duct 11. The damper 17 is set at rotational positions C and D in the figure by the auxiliary partition wall 23. Damper 1
8 can be fixed at positions G, H, and J in the figure within the rotation range.

Furthermore, an air mix damper 19 is provided at the end of the air inflow side of the heater core 10 downstream of the evaporator 9 in the duct 8 to adjust the proportion of air flow passing through the heater core 10. By adjusting the temperature within the range of A and B in the diagram, the temperature of the air blown into the vehicle interior can be adjusted as desired.

FIG. 2 shows an air conditioning control panel 30 installed in or around the instrument panel of an automobile, where 31 is an inside/outside air selection switch, and the inside/outside air switching damper 2 is connected to the outside air indicated by the dashed line in FIG. It is operated to the intake position (FRESH) and the internal air intake position (RECIRC) shown by the solid line in FIG. 32 is the temperature adjustment knob, air mix damper 19
The maximum cooling position (Co
.

L) and the maximum heating position (HOT) indicated by the broken line C in FIG. 33 is a blowout mode setting switch, and the various dampers 16, 17, . . . shown in FIG.
1B, 19, 20, 21. An actuator mechanism (not shown) for opening and closing 22, such as a combination of a diaphragm, a negative pressure source, and a solenoid valve provided in the negative pressure supply device,
Alternatively, the following five blowing modes can be set by controlling using a servo motor.

That is, (1) pie level (B, -L) mode, (2
) Vent (V,,t) mode, (3) Heat (H,
,1) mode, (4) defroster (Dir) mode,
(5) Daf-Ha-) (Daf-Ha□). These are set by a mode setting switch 33.

34 is a blower control switch, which is a fan drive motor 7a.
The blower can be stopped (OF
F), low speed (Lo), medium speed (Me), and high speed (Hi). Reference numeral 35 denotes a compressor operation switch called a general air conditioner switch, which turns off and on electricity to the electromagnetic clutch for the compressor of the refrigeration cycle, thereby turning on and off the operation of the compressor.

Therefore, when this switch 35 is turned on and the compressor is operated, the cooling effect by the evaporator 9 is obtained.

Next, the operation of this embodiment will be explained. When the mode setting switch in FIG. 2 is set to the vent (Vll, L'') mode, the damper 21 is operated to the dotted line position M in FIG. 1, and the vent outlet 14 is opened.

In conjunction with this, dampers 16.17, 18, 20.22
are operated to positions E, C, G, and O in Figure 1, respectively,
Close the defroster outlet 15 and heat outlet 13.

Therefore, the air blown by the blower 5 is blown into the duct 8, passes through the evaporator 9, and then flows into the heater core 10, which opens the air mix damper 19 which is linked to the temperature control lever 32 of the control panel 30 in FIG. The air becomes air at an appropriate temperature determined by the temperature, and flows into the vent outlet 14.

Note that the air mix damper 19 is in position A during maximum cooling. The air introduced into the vent outlet 14 is blown out from a vehicle interior vent outlet (not shown) toward the upper body of the passenger in the vehicle interior, thereby performing cooling or ventilation.

Next, in the heat (H,,t) mode, the damper 2
1 is operated to the position L in FIG. 1, and the vent outlet 14 is opened.
At the same time, the damper 22 is operated to the position O in FIG. 1, and the defroster outlet 15 is closed. and damper 2
0 is operated to the position K in FIG. 1 to open the heat outlet 13. In conjunction with this, the dampers 16, 17, and 18 are operated to positions E, C, and 1. Therefore, the air blown into the duct 8 passes through the evaporator 9 and the heater core lO
The heated air is blown out from the heater outlet 13 to the passenger's feet from a heat outlet (not shown) in the vehicle interior, thereby performing a heating effect.

The air outlet temperature can be controlled by moving the temperature control lever 32 of the control panel shown in FIG. Note that it is in position B at maximum heating.

Next, in the defroster (Dir) mode, damper 2
0 and 21 are operated to the positions J and 21 in FIG. 1, respectively, to close the heat outlet 13 and the vent outlet 14. The damper 22 is then operated to the N position in FIG. 1 to open the defroster outlet 15. In conjunction with this, damper 16.
17 and 18 are respectively operated to positions E, C, and G in Fig. 1, and the air that has been core mixed to the appropriate temperature by the air mix damper 19 is blown out from the defroster outlet 15, as in the heater mode and vent mode. Further, the air is blown toward the window glass from a defroster outlet (not shown) in the vehicle interior, and has the effect of defogging the window glass.

Next, the pie level (Bi-L) mode will be explained. The damper 22 is operated to the position O in FIG. 1 to close the defrost outlet. Then, the dampers 20 and 21 are operated to the position M in FIG. 1 to open the heat outlet 13 and the vent outlet 14.

In conjunction with that, damper 16.1? , 18 and 19 are respectively operated to positions E, C, and H in FIG. Air that has passed through the upper part of the heater core IO in the figure is introduced into the heater outlet 13.

For this reason, air at the same or lower temperature than the heater outlet in the vehicle interior is blown out from the interior pen and outlet (not shown), and warm air is blown at the feet of the occupants, and warm air above them is blown out at a lower temperature than the feet. It is also possible to obtain a comfortable blown air temperature distribution.

In addition, the damper 18 is not fixed at the H position in FIG. 1, but any position in G-1 can be selected, and the H, 1) mode to the heater outlet 13 and the vent outlet 14 will be explained. . In the differential heat mode, the damper 21 is operated to the L position in FIG. 1, and the dampers 20 and 22 are respectively operated to the N position in FIG. 1, so that the heat outlet 13 and the defroster outlet 15 are both opened at the same time. In conjunction with this, damper 16,1? , 18°1
9 are operated to positions F, D, and H in FIG. 1, respectively.

At this time, the air mix damper 19 can be set arbitrarily within a range that does not hit the damper 17.

Part of the air blown into the duct 8 by the blower 5 is introduced into the bypass duct 11, and the rest is introduced into the evaporator 9.
pass through. The air introduced into the bypass duct 11 is
The air passes through a part of the heater core 10 and is heated to become warm air, which is then blown out from the heater outlet 13 and blown out to the occupant's feet from the vehicle interior heater outlet (not shown).

What is important here is that air sucked in by the blower 5 from the internal/external switching box bypasses the evaporator 9, is introduced into the bypass duct 11 as it is, and is heated by the heater core 10.

Further, the air blown into the duct 8 is dehumidified and cooled by the evaporator 9 when the air conditioner switch shown at 35 in FIG. 2 is turned on to remove and prevent fogging. The dehumidified and cooled air passes through the Hitacore IO except for a portion disposed in the bypass duct 11, becomes air at an appropriate temperature determined by the opening degree of the air mix damper 19, and is blown out from the defrost outlet 15.

In this example, the ratio of air volume between the heat outlet and the defrost outlet in the differential heat mode is approximately 5:5, which is the same.

Therefore, in the case of introducing outside air, outside air with a low absolute temperature in winter is dehumidified and cooled by passing through the evaporator 9, and the absolute temperature is further lowered, heated by the heater core 10, and blown out from the defrost outlet 15. .

Since the outside air introduced into the bypass duct 11 bypassing the evaporator 9 is not dehumidified by the evaporator 9, hot air with a high sensible temperature is blown out from the heater outlet 13 while retaining humidity.

Next, in the case of introducing inside air, the absolute temperature of the inside air is higher than that of outside air, but as in the case of introducing outside air, dry warm air comes from the defrost outlet and moist air comes from the heater outlet. Warm air blows out. In this case of introducing inside air, the warm air once heated by the heater core IO is reheated by introducing inside air again, so there is an advantage that the heating efficiency is improved.

In this example, the defroster mode and the defroster/heat mode are separated, but this mode does not require warm air at the feet, as is the case during the rainy season in Japan, but only dehumidifies, and is useful for removing fog from window glass. This is because it is possible to prevent moisture from remaining in the vehicle interior more than necessary if prevention is to be carried out.

However, depending on the case, the defroster mode may be eliminated and only the differential/heat mode may be used.

FIG. 3 shows a second embodiment. The blower 5 in FIG. 1 is an automotive air conditioner configured to suck in only either inside air or outside air. In winter, inside air has higher humidity than outside air, so when the air conditioner is operated with inside air circulation, more moisture remains in the vehicle interior than when outside air is introduced and dehumidified. Therefore, in the second embodiment, when the damper 17 is operated to the position E in FIG. 3, an auxiliary blower 25 is provided which operates in conjunction with the damper 17.

This auxiliary blower 25 sucks in only the inside air and blows it out from the heat outlet. The main blower 5 sucks in outside air, turns it into dry air, and blows it out from the defroster outlet.

By doing so, it is possible to blow out slightly moister warm air from the heat outlet than from the defrost outlet, and furthermore, it is possible to prevent moisture from accumulating in the vehicle interior.

Next, a third embodiment is shown in FIG. FIG. 4 shows an example using a reheat type heater core 10.
The temperature of the blown air is controlled by changing the amount of heat released from the heater core 10 by adjusting the flow rate of the engine cooling suction flowing into the heater core 10 using the hot water valve 40. Even in an air conditioner, a differential heater mode can be set as shown in FIG. 4, and the present invention can be implemented.

Further, in the first and second embodiments, when the evaporator 9 is in the pi-level mode, the damper 16 is operated to the position F in FIG. 1, and the damper 17 is operated to the position D in FIG. In FIG. 3, by operating the damper 17 to the position D, the auxiliary blower 25 may be activated, so that hot air with humidity can be emitted from the heat outlet 13, bypassing the evaporator 9.

Furthermore, in the heater motor 1 of the first and second embodiments,
By operating the damper 16 to the F position, the damper 17 to the D position, and the damper 18 to the I position in FIG.
Air is also blown into the bypass duct 11, but since it does not pass through the evaporator 9, the pressure loss is reduced, so even if the amount of air passing through the main duct 8 and the bypass duct 11 is increased and the heating capacity is increased. good.

In addition, in the above three embodiments, the heater core lO is connected to the duct 8.
Although the heater core is shared by both the bypass duct 11 and the bypass duct 11, separate heater cores may be used.

Furthermore, in the above-mentioned 1st, 2nd and 3rd references, a so-called push-in type was explained in which the blower is placed upstream of the duct and air is sent into the duct, but it is not possible to place the blower downstream of the heater core. Of course.

Furthermore, a link mechanism may be used as the actuator for operating each damper in relation to the blowout mode position.

FIG.

1...Internal and external air switching box, 2...Internal and external air switching damper, 3
... Inside air inlet, 4... Outside air inlet, 5... Blower, 8... First duct, 9... Evaporator, 1
0... Heater core, 11... Bypass duct (second
ducts).

12...Partition wall, 13...Heat blowout 0.14...
・Vent blowout 0.15...Defroster blowout 0.16.
17... Second duct opening/closing damper, 19... Air mix damper, 20... Heat outlet damper (air outlet switching damper), 21... Vent outlet damper, 22
...Defroster outlet damper (outlet switching damper).

Claims (1)

[Scope of Claims] (a) a first duct having an air intake port at one end and at least a defroster outlet for blowing air toward the window glass at the other end; (b) the first duct; (c) a second duct that is provided to bypass the evaporator and has a heater outlet at its outlet end that opens at the feet of the passenger; (d) ) A heater core that is disposed in both the first duct and the second duct and heats the blown air; (e) A heater core that opens and closes the heater outlet and the defroster outlet and simultaneously blows air from both the outlet. (f) an air outlet switching damper means that can set a differential/heater mode for blowing out the air;
An air conditioner for an automobile, comprising a second duct opening/closing damper means provided to open the second duct in a heater mode.