JPS6216332Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner, particularly a control device for periodically discharging condensed water from an evaporator in a vehicle air conditioner.

Water that condenses in the evaporator of an in-vehicle air conditioner accumulates as water droplets or a water film due to surface tension on or between the fins, which adversely affects heat exchange and reduces cooling capacity. In addition, in the case of a forced-type evaporator with a structure in which the blower unit is installed in front of the evaporator, the pressure inside the evaporator case is high and condensed water is said to be discharged well, but the blower motor rotates at maximum speed. Sometimes condensed water that adheres between the fins is blown sideways by wind speeds that are greater than the force of the water trying to fall toward the drain port, causing water splashing and water leaks.

In conventional evaporators, measures have been taken to reduce the negative effects of condensed water, such as structuring the evaporator coil and applying surface treatments, but they have not yet been sufficiently effective. It has not been done.

The purpose of this invention is to reduce the above-mentioned adverse effect on heat exchange by periodically forcibly discharging the condensed water that has adhered to the fins, etc., and also to reduce the above-mentioned water splashing.
It also removes water leaks, etc.

In order to achieve this object, the present invention operates a timer circuit by means of a blower motor switch, which switches a damper in front of the blower unit to change the direction of air from the blower unit relative to the evaporator coil. It is characterized by being configured to discharge condensed water from the coil.

The present invention will be described below with reference to an embodiment shown in the drawings. The figure shows an embodiment in which the present invention is applied to a vehicle air conditioner. In the figure, 1 is the evaporator case, 2 is the evaporator coil, 3 is the blower unit, and 4 is the evaporator case.
is a damper, 5 is a damper switching actuator, 6 is an intake manifold, 7 is a solenoid valve, 8 is a blower motor, 9 and 11 are resistors, 10 is a blower motor switch, 12 is an air conditioner switch, 13
is the air conditioner relay, 14 is the discharge operation relay, 1
5 is a thermostat, 16 is a pressure switch, 17
is the compressor clutch, 18 is the timer, 1
9 is a timer motor, 20 is a discharge port, and 21 is a power source.

When the blower switch 10 is set to the position and the air conditioner switch 12 is turned on, the air conditioner
Relay 13 is activated, energizing compressor clutch 17 via air conditioner control thermostat 15 and pressure switch 16, and the refrigeration cycle is started.

At this time, the blower motor 8 is energized via the resistor 11 and the normally closed contact b of the discharge operation relay 14.
The blower unit 3 is driven and the damper 4 is at position A. Air from the blower unit 3 is therefore sent to the evaporator coil 2 for heat exchange.

The timer 18 is driven by a timer motor 19, and is in an on state only for a predetermined period of time, and is in an off state most of the other time. As is clear from the figure, the motor 19 is energized at the same time as the air conditioner relay 13 is activated, and when the timer 18 is turned on, the relay 14 is energized, so its normally open contact a is turned on, and the motor 8 is connected to the resistor 11. The current will be applied without going through it. In this way, the blower switch 9 is set to a position other than the OFF position.
When the timer 18 is in the on position, the blower motor 8 rotates at a higher rotational speed than when it is in the off state, so the amount of air blown from the blower unit 3 increases.

Furthermore, when the timer 18 is turned on, the solenoid valve 7 is operated to switch the actuator 5 from the atmospheric pressure state to the negative pressure state supplied from the engine intake manifold 6 and operate the damper 4 from the position A to the position B. I come to.

At this time, the increased air sent from the blower unit 3 exchanges heat and at the same time changes its direction downward with respect to the evaporator coil 2 as shown by the arrow 22, so the pressure rises and the condensed water there is forced to the outlet 20.
to be discharged.

Since the timer 18 is turned on periodically for a predetermined period of time, the condensed water is reliably discharged. Also, at this time, the rotation speed of the blower motor increases, so the actual air volume for heat exchange does not change (because the ventilation resistance of the evaporator coil 2 changes depending on the positions A and B of the damper 4, This difference is accommodated by a resistor 11), which does not cause discomfort to the occupants.

As explained above, according to the present invention, it is possible to reduce the adverse effects of condensed water as in the prior art, and to eliminate water splashing, water leakage, etc.

[Brief explanation of the drawing]

The figure is a schematic diagram showing the configuration of an embodiment of the present invention. 2...Evaporator coil, 3...Blower unit,
4... Damper, 8... Blower motor, 10... Blower motor switch, 12... Air conditioner switch, 18... Timer, 19... Timer motor, 20... Discharge port.

Claims (1)

[Claims for Utility Model Registration] (1) A timer circuit is activated by a blower motor switch, and the timer circuit switches a damper in front of the blower unit to change the direction of the air from the blower unit relative to the evaporator coil. An air conditioner characterized in that the air conditioner is configured to discharge condensed water from the coil. (2) The air conditioner according to claim (1), wherein the number of revolutions of a blower motor that drives the blower unit is increased by the operation of the timer circuit.