JPS62166248A - Drain pump control device for air conditioner - Google Patents

Abstract

PURPOSE:To enable the prevention of over-flow of a drain pan to be performed without using any water level sensor by a method wherein a drain pump repeats its operation/stop periodically for a specified period of time in cooperation with an operation of a compressor. CONSTITUTION:When an operation switch 8 is turned On and a thermostat 9 is turned ON, a compressor 9a is operated to start a normal cooling operation. Simultaneously, a drain motor 3a and ON-timer 11a are operated to discharge drain water 5. As a specified period of time is elapsed, the ON-timer 11a is timed up and ON-timer contact point 11 is operated. A relay contact point 10 is operated, the drain timer 3a and the ON timer 11a are turned OFF and the OFF timer is operated. At this time, the drain pump 3 is stopped to interrupt a discharging operation for drain water 5. As this condition is elapsed for a specified period of time, the OFF-timer 12a becomes a timed-up condition, OFF- timer contact point 12 is operated and again the drain motor 3a and the ON- timer 11a are operated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to the operation control of a drain pump device ch that prevents overflow of a drain pan of an air conditioner.

Conventional technology Generally, when an air conditioner is in cooling operation, water droplets are generated in the heat exchanger and these water droplets accumulate in a drain pan installed at the bottom. Therefore, forced discharge using a drain pump has become common as a means of releasing these water droplets. has been done. For example, the configuration was as shown in FIG. 4^ That is, when water droplets are generated in the heat exchanger 1 during cooling operation of the air conditioner, the water droplets begin to accumulate in the drain pan 2 provided at the lower part. When water drops accumulate further and the water level rises, the water level detector 6 installed inside the drain pan 2 operates.
The signal is sent to the controller 4. Furthermore, a @J cropping signal is sent from the controller 4 to the drain pump 3, so that the water droplets in the drain pan 2 are forcibly discharged to the outside by the drain pump 3.
It had become.

Problems to be Solved by the Invention In the conventional structure, it is clear that the drain pump operates reliably by the water level detector 6, but when the water level detector 6 does not need to operate for a long period of time ( For example, in winter, water droplets rarely accumulate in drain pan 2)
There is a possibility that dust, dirt, etc. may adhere to the water level detector 6.

In this state, when the air conditioner is operated again in the summer, there is a problem in that the water level detector 6 will no longer operate reliably due to the influence of the dust, dirt, etc. mentioned above.

Means for Solving the Problems The technical means of the present invention for solving the above problems is to eliminate the need for a water level detector, operate the drain motor for a certain period of time when the compressor is operating, and further operate the drain motor for a certain period of time. It is designed to have a period of stopping.

For production The effect of this technical means is as follows.

That is, since the drain pump repeats operation/stop periodically for a certain period of time in conjunction with the operation of the compressor, water droplets are discharged to the outside for a certain period of time, regardless of the amount of water droplets in the drain pan.

Therefore, it is possible to prevent drain pan overflow in the same manner as in the past without using a water level detector.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3.

FIG. 1 is a diagram showing the configuration of a drain pump control device for an air conditioner according to the present invention. Further, since the configuration is the same as the conventional example, the explanation will be omitted here.

Next, a sequence circuit diagram of the controller 4 is shown in FIG.

In Figure 2, 7 is an AC power supply, 8 is an operation switch,
It is connected to the AC power source 7. Furthermore, 9 is a thermostat, which is connected in series with the operation switch 8. Furthermore, the common side of the thermostat 9 is connected to a relay contact 10.
Relay coil 10a1 is connected to compressor 9a.

Further, a drain motor 3a and an ON timer 11a are connected to the closed contact side of the relay contact 10. Further, the open contact side of the relay contact 10 is connected to an OFF timer 12a. Further, the opposite side of the relay coil 10a is connected in series with an ON timer contact 11 and an OFF timer contact 12. Furthermore, is the drain motor 3a ON-tie? −
11a, OFF timer 12 &, OFF timer contact 1
2. Each opposite terminal side of the compressor 9 & is connected to the opposite terminal side of the AC power source.

The operation of the above configuration will now be explained.

First, turn on the operation switch 8. Next, when the thermostat 9 is turned on, the compressor 9a operates and normal cooling operation starts. At the same time, drain motor 3a and ON timer 11a
At this time, the drain water 5 in the drain pan 2 is forcibly discharged from the drain pump 3 to the outside. When this operation reaches a certain time, the ON timer 11a times up and the ON timer contact 11 operates.

In this state, the relay coil 10a becomes excited, so the relay contact 10 operates and the drain motor 3a and ○N
Furthermore, the timer 11a goes into the OFF state.[The OFF timer goes into the fiIJ operation state. At this time, the drain pump 3 is stopped and the discharge operation of the drain water 5 is interrupted.

When this condition continues for a certain period of time, the OFF timer 12a enters the time amplifier state and the OFF timer contact 12 operates. Therefore, the relay coil 10a is de-energized and the relay contact 10 is turned off.

When this operation occurs, the drain motor 3a and ON timer 11a operate again.

Further, the above series of repeated operations are cleared by turning off the operation switch or turning off the thermostat.

The above operation is shown in the timing chart of FIG.

Therefore, the ON timer 11a is used to operate the drain pump 3 for a certain period of time from the start of cooling operation, and the ON timer 11a is used to stop the drain pump 3 for a certain period of time. By setting the operation time of .1a and the OFF timer 12a, sufficient measures against overflow can be taken.

Although the present invention has been explained using a sequential system, it goes without saying that timer control can be performed using electronic components.

Further, although the drain pump 3 is operated at the same time as the compressor 9a, it is not limited to the same time, and may be started a little later than the compressor 9a.

Effects of the Invention As described above, the present invention has the same effect as the conventional overflow countermeasure using a water level detector by operating/stopping the drain pump at predetermined intervals in conjunction with the cooling operation. Furthermore, since the control eliminates the need for a water level detector, it has the effect of greatly contributing to cost savings.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a drain pump control device for an air conditioner showing an embodiment of the present invention, Fig. 2 is a sequence circuit diagram of a controller that controls the drain pump, and Fig. 3 is an operation of the drain pump. Timing chart diagram showing timing, 4th
The figure is a configuration diagram of a conventional drain pump control device for an air conditioner. 1...Heat exchanger, 2...Drain pan,
3...Drain pump, 3a...Drain morph, 4...Controller, 11a...O
N timer, 12a・river・OFF timer. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
--Replacement attachment 2--Drain pump -1-Drain water 3a-m-Drain motor 7-Buntei Electric Co., Ltd. Figure 3 Drain motor

Claims (1)

[Claims] In an air conditioner having a drain pump for discharging drain water from a drain pan to the outside, the drain pump is operated for a certain period of time in conjunction with the start of cooling operation, and then stopped for a certain period of time at a repeated period. Drain pump control device for air conditioners.