JPS6216333Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a condensate discharge control device in an on-vehicle air conditioner, particularly in a suction evaporator upstream of a blower unit.

In a vehicle air conditioner, if the evaporator is a suction type evaporator located before the blower unit, the suction action of the blower unit creates negative pressure inside the evaporator case (pressure is lower than atmospheric pressure), causing condensation. The disadvantage is that the water cannot be smoothly drained out of the evaporator case, especially when the blower motor is at maximum rotation.

The object of the invention is therefore to provide an on-vehicle air conditioner that can automatically drain the condensed water accumulated in the case.

In order to achieve the above object, the vehicle air conditioner of the type mentioned at the beginning according to the present invention includes a condensed water sensor installed in the evaporator case, and a condensed water sensor installed in the condenser case. An electric circuit is provided for operating a damper switching actuator in response to a signal from the condensed water sensor when the condensate is detected, and the damper actuator switches the damper so that the evaporator case is connected to the main ventilation passage of the air conditioner. The gist is to move the damper in the direction in which it is removed.

Hereinafter, the present invention will be explained in more detail using examples with reference to the drawings, but these are merely illustrative and it is understood that various modifications and improvements may be made without going beyond the scope of the present invention. Of course.

FIG. 1 is a schematic sectional view of a vehicle air conditioner according to the present invention, and FIG. 2 is a control circuit diagram for the device shown in FIG. In the figure, 1 is the evaporator case, 2 is the evaporator coil, 3 is the blower unit, 4 is the blower motor, 5 is the switching damper, 6 is the drain outlet, 7 is the condensed water sensor, 8 is the damper switching actuator, 9 is a solenoid valve, 10 is an intake manifold, 11 is a resistor, 12 is a blower motor switch, 13 is an air conditioner cut relay, 14 is an air conditioner switch, 15 is an air conditioner relay, 16 is an air conditioner control switch, 1
7 represents a compressor clutch, and 18 represents a power supply.

In the apparatus shown in FIG. 1, when the blower switch 12 and the air conditioner switch 14 are turned on, the air conditioner relay 15 is activated and current is sent to the compressor clutch 17 through the air conditioner control switches 16, and the refrigeration cycle is started. Operate.
Here, while the refrigeration cycle is operating, evaporator case 1
When the condensed water inside reaches a certain height,
Condensed water sensor 7 (sensor that becomes conductive due to water)
is detected, and the circuit shown in Figure 2 turns on the air conditioner, cut, and
The relay 13 operates (the blower motor is operating), and the solenoid valve 9 also operates at the same time, switching the damper switching actuator 8 from the atmospheric pressure state to the negative pressure state (supplied from the engine intake manifold 10). , activate. The switching damper 5 moves from the position shown by the solid line to the position shown by the broken line, and the air that had been passing through the path shown by the double arrow is now passed through the evaporator coil 2 as shown by the double arrow drawn by the broken line. The air is then sent into the passenger compartment through the bypass passage. At this time, the pressure inside the evaporator case 1 approaches atmospheric pressure, and the accumulated condensed water is discharged through the drain outlet 6. Once the water has finished draining, the air conditioner returns to normal operation, and this operation is repeated.

As shown in FIG. 3, an air conditioner having an outside air inlet 19, an outside air switching damper 5, and its actuator 8, which are already installed between the blower unit 3 and the evaporator, also has an air conditioner installed inside the evaporator case 1. It goes without saying that the control circuit shown in FIG. 2 can be applied by providing the condensed water sensor 7.

This type of air conditioner does not require a bypass passage, making it possible to provide a condensed water discharge device at low cost.

As explained above, according to the present invention, condensed water discharge performance can be improved in a suction evaporator, and water leakage can be prevented.

[Brief explanation of the drawing]

1 and 3 are schematic cross-sectional views of on-vehicle air conditioners in two different embodiments of the present invention, and FIG. 2 is a control circuit for the device shown in FIGS. 1 and 3. It is a diagram. 1...Evaporator case, 2...Evaporator coil, 3
...Blower unit, 4...Blower motor,
5...Switching damper, 6...Drain outlet, 7...
Condensed water sensor, 8... Damper switching actuator, 9... Solenoid valve, 10... Intake manifold, 11... Resistor, 12... Blower motor switch, 13... Air conditioner cut relay, 14... ...Air conditioner switch, 15... Air conditioner relay, 16... Air conditioner control switches, 17... Compressor clutch, 18...
Power supply, 19...Outside air inlet.

Claims (1)

[Scope of utility model registration request] In a vehicle air conditioner having a suction type evaporator where the evaporator is located in front of the blower unit, the condensed water sensor installed in the evaporator case and the condensed water sensor detect when condensed water accumulates in the condenser case. An electric circuit is provided for operating a damper switching actuator in response to a signal from the condensed water sensor, and the damper actuator switches the damper so that the evaporator case is connected to the main ventilation passage of the air conditioner. An in-vehicle air conditioner characterized by moving a damper in the direction in which the damper is moved.