JPS6326242Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an air conditioner for an automobile that air-conditions the interior of an automobile.

Conventional configuration and its problems As shown in Figure 1, the conventional air conditioner cools and dehumidifies the air from the blower 1 in the evaporator 2 of the refrigeration cycle, and then cools and dehumidifies the air into the engine cooling water. is reheated in a heater 3 through which
At this time, the engine cooling water flow rate was varied by the flow rate control valve 4 to adjust the amount of reheating, and the air was sent to each of the air blowing passages 5 and 6 at a desired air temperature. In such a configuration, the occupant's desires, i.e.,
Cold air is blown out from the chest outlet passage 5, and warm air is blown out from the foot outlet passage 6.
There were problems in terms of functionality and air conditioning comfort, such as the inability to use the so-called bi-level mode for cold head and warm feet.

Purpose of the invention The present invention eliminates the above-mentioned drawbacks of the conventional system and aims to improve functionality and air conditioning comfort.

Structure of the invention The present invention includes: a blower for feeding air; an evaporator provided downstream of the air blower to cool and dehumidify the air; and an evaporator provided downstream of the air of the evaporator. a heater that reheats the air and adjusts the amount of heating by changing the amount of engine cooling water;
In the heater, a group of closely spaced air-side heat transfer fins corresponding to the upstream side of the engine cooling water;
Similarly, a group of coarsely spaced air-side heat transfer fins corresponding to the downstream side is provided on the air downstream side of the boundary between the air-side heat transfer fin groups, and the air which has passed through both the air-side heat transfer fin groups is provided. It is composed of a barrier that prevents mixing and each air blowing duct provided on the downstream side of the barrier, and is extremely advantageous in practice in that it can enable a bilevel mode, thereby improving the air conditioning comfort of the occupants. It is something.

DESCRIPTION OF EMBODIMENTS Examples of the present invention will be described below with reference to FIGS. 2 to 4. In the figure, reference numeral 7 denotes a blower for supplying air, and air from inside and outside the vehicle is sucked in by rotation of the intake damper 8. Reference numeral 9 denotes an evaporator that cools and dehumidifies the air.The air is cooled here and has low humidity, making it difficult for dew to form inside the vehicle. The air that has passed through the evaporator 9 is reheated by engine cooling water (hot water) that flows through the flow control valve 10 to the heater 11 . The amount of reheating in the heater 11 is adjusted as appropriate by the flow rate regulating valve 10, and the air is brought to a desired temperature, and the air is discharged into the chest blow-off ducts 12 and 12 depending on the operation mode.
It is blown into the vehicle interior from the footwell blow-off duct 13 and the defrost blow-off duct 14 (damper is omitted). The air-side heat transfer fin group 11a corresponding to the engine cooling water upstream side of the heater 11 has a close interval (pitch), and the air-side heat transfer fin group 11b corresponding to the downstream side also has a coarse interval. Heater 1
The temperature of the engine cooling water flowing inside the engine is high on the inlet side (upstream side) and becomes lower toward the downstream side. Therefore, the temperature of the air that has passed through the dense air-side heat transfer fin group 11a on the upstream side is high, and the temperature of the air that has passed through the coarse air-side heat transfer fin group 11b on the downstream side is low due to a decrease in engine cooling water. It becomes lower due to the reduction in the amount of heat transfer due to the coarse air side heat transfer fin group 11b. In bi-level mode, chest damper 15
is set to the position indicated by the dotted line in the figure, and by opening the foot damper 16, the dense air side heat transfer fin group 11
The warm air that has been sufficiently reheated in step a flows out from the foot blow-off duct 13 to the passenger's feet, and the relatively cool air that has passed through the coarse air-side heat transfer fin group 11b flows from the chest blow-off duct 12 to the passenger's chest. It will be leaked. At this time, the dense air side heat transfer fin group 11a
The barrier 17 provided on the downstream side of the air at the boundary between the coarse air-side heat transfer fin group 11b prevents mixing of warm air and cool air. In addition, in the case of cooling mode, the foot damper 16 is closed and ventilation only comes from the chest blow-off duct 12, and the position of the chest damper 15 is set near the solid line in the figure to create a dense air-side heat transfer fin. The air that has passed through the group 11a also flows into the chest blow-off duct 12, and cool air at a desired temperature is blown out by the action of the flow rate regulating valve 10. The same operation as described above is performed in other heating modes and defrost modes. Note that air flows from arrow A, and hot water flows from arrow B.

In the apparatus having the above configuration, the chest damper 15 is connected to the dense air-side heat transfer fins against the barrier 17 provided on the air downstream side at the boundary between the dense air-side heat transfer fin group 11a and the coarse air-side heat transfer fin group 11b. By rotatably providing the air flow from the group 11a to the chest blow-off duct 12, it is possible to effectively separate warm air and cool air in the bi-level mode, and in the cooling mode. By setting the chest damper 15, the air from the dense air-side heat transfer fin group 11a is allowed to flow into the chest blow-off duct 12, and the temperature of the cold air blown out can be controlled freely using the flow rate control valve 10.

Further, in the embodiment of the present invention, the heater 11 is of the fin and tube type shown in FIG. 3, but it goes without saying that it may be of the serpentine type shown in FIG. 4.

Effects of the invention As described above, the present invention provides a heater having a closely spaced air-side heat transfer fin portion and a coarse air-side heat transfer fin portion on the air downstream side of the evaporator. Since there is a barrier on the side that prevents the mixing of the airflows that have passed through the heat transfer fins, it is possible to achieve bi-level mode with a simple configuration, greatly improving air conditioning comfort for the occupants. be able to. Furthermore, since the configuration of the heater is simple, it also has the advantage of being easy to manufacture.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional air conditioner, Fig. 2 is a sectional view of an automotive air conditioner according to an embodiment of the present invention, Fig. 3 is a partially enlarged perspective view of the heater, and Fig. 4. is a partially enlarged perspective view of another embodiment of the heater. 7... Blower, 9... Evaporator, 11... Heater, 11a... Dense air side heat transfer fin group, 11b
... Coarse air side heat transfer fin group, 12, 13, 14
... Each air blowing duct, 17... Barrier.

Claims (1)

[Scope of utility model registration request] an air blower that supplies air; an evaporator that is installed downstream of the air blower to cool and dehumidify the air; and an evaporator that is installed downstream of the evaporator that reheats the air. a heater that adjusts the amount of heating by changing the flow rate of engine cooling water; and in the heater, a group of air-side heat transfer fins closely spaced corresponding to the upstream side of the engine cooling water, and a group of closely spaced air-side heat transfer fins corresponding to the downstream side. a group of coarse air-side heat transfer fins,
a barrier provided on the air downstream side of the boundary between the air side heat transfer fin groups and preventing mixing of the air that has passed through the air heat transfer fin groups; and a barrier provided on the air downstream side of the barrier. An air conditioner for automobiles consisting of an air blowing duct.