JPS6216795A - Washing machine with drain pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a washing machine with a drain pump that has an improved operation control configuration for a drain pump motor.

[Technical Background of the Invention] Conventionally, in this type of washing machine with a drain pump, the drain pump motor is operated for an operating time set by a manually operated mechanical timer or a microcomputer-controlled electronic timer. Control is provided.

[Problems with back slip technology] By the way, in this type of washing machine, as the water drains and the water in the tank decreases, a vortex is created between the water surface and the drain port, and this vortex causes air to flow into the drain pump. This may cause the drain pump to idle. If such a idling state occurs, drainage becomes almost impossible, but in the conventional configuration, the drain pump motor is controlled by a timer, so the idling state of the drain pump occurs.

Regardless of whether this happens or not, the υ1 water pump motor will be stopped after the set time. Therefore, in the conventional configuration, when the drain pump becomes idling, there is a drawback that the draining process ends with water remaining in the tank.

[Purpose of the Invention] The present invention has been made in view of the above points, and its purpose is to detect the idling state of the drain pump, and to completely drain the water in the tank even if the drain pump is idling. To provide a washing machine with a drain pump that can drain the waste water.

[Summary of the Invention] The present invention includes an idling detection means for detecting an idling state of a certain drainage pump based on a current flowing through a drainage pump motor, and a idling detection means that detects idling of the υ1 water pump. The present invention is characterized in that a control means for controlling the drainage pump motor is provided.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a drain pump motor that drives a drain pump (not shown), 2 is an AC power source, and 3 is a relay switch. These are connected in series, and the relay switch 3 can control the drain pump motor 1 to turn on or off. It looks like this. Reference numeral 4 denotes a current value detection section, which receives a detected current from a current transformer 5 that detects the current flowing through the drain pump motor 1, and outputs a current value signal 3a corresponding to the current flowing through the drain pump motor 1. Reference numeral 6 denotes a reference current value generating section that outputs a reference current value signal sb. By the way, as is clear from the characteristic diagram between the current of the drain pump motor 1 and the load shown in Fig. 2, a current I of Ia≦■≦Ib flows through the drain pump motor 1 during drainage operation, and the load is low during idle operation. As a result, a current I with I<Ia flows to the drain pump motor 1.

Therefore, the reference current value signal sb is set to a value corresponding to this current value ■a. Reference numeral 7 denotes a current value comparison/judgment section, which receives the current value signal 3a and the reference current value signal sb and compares these signals 3a and 3b.
It outputs a comparison determination signal SC which becomes low level when a≧sb and becomes high level when 3a<3b. These current value detection sections 4. The reference current value generation section 6 and the current value comparison/determination section 7 constitute a slip detection means 8. Reference numeral 9 denotes a control unit which is a control means for controlling the drain pump motor 1, and this controls the relay switch 3 when the comparison judgment signal SC is at a low level.
By opening the drain pump motor 1, the drain pump motor 1 is operated and the drain operating state is displayed on the display section 10. On the other hand, when the comparison judgment signal SC is at a high level, the relay switch 3 is opened to stop the operation of the water pump motor 1 for a predetermined period of time, and the operation stop state is displayed on the display section 10, and then the relay switch 3 is opened. When the drain pump motor 1 is closed, the drain pump motor 1 is restarted and the display unit 10 displays the drain operation status.

For example, when the comparison judgment signal SC is at a high level for the second time, the drain pump motor 1 is stopped by opening the relay switch 3 to complete the draining process of the washing machine, and the display section 10 displays the drain water. It is configured to display the stroke end status.

Next, the operation of the above structure will be described according to a flowchart not shown in FIG.

After the start of the drainage process, first in process A, the count value N of a counter that stores the number of times the idle state of the drainage pump motor 1 has been detected is cleared to zero. Then, by closing the switch 3, the process B of operating the drain pump motor 1 is executed, and the water in the tank is discharged. Next, in the determination section C, the current value signal 3a and the reference current value signal Sb are compared, and when Sa≧sb, the process returns to process B and the operation of the drain pump motor 1 is continued. On the other hand, when air flows into the drain pump and Sa<Sb, that is, the drain pump motor 1 becomes idle, processing is executed. In this process, the count value N of the counter is increased by 1 to step up the count value N. After executing this process, the judgment unit E compares the count values N of the counters, and finds that N<
2. In other words, once the first idling state of the drain pump motor 1 is detected, the process of stopping the pump motor 1 for a predetermined period of time is executed.In this case, the air inside the drain pump is naturally exhausted, and the drain pump is stopped. The inside is filled with the water in the tank. After a predetermined period of time has passed, the process returns to process B and the drain pump motor 1 is operated again to discharge the remaining water in the tank one by one. In this way, the remaining water in the tank is The water will be completely drained,
The second idling state of the drain pump motor 1 is detected, and since N≧2 is determined in the judgment section E, a process G for stopping the drain pump motor 1 is executed, and the draining process is ended.

If J: is applied to this embodiment of this J: configuration, the following effects can be obtained. That is, the idling detection means 8 detects the idling state of the drain pump motor 1, and when the drain pump motor 1 is idling, the control unit 9 stops the drain pump motor 1 for a predetermined period of time. The air in the pump is discharged, and the water remaining in the tank can be completely removed by restarting the pump. Furthermore, as soon as the second idling state of the drain pump motor 1 is detected in the complete drain state, the control unit 9 stops the drain pump motor 1, so that the drain can be completed reliably. . As a result, the water in the tank is discharged as in the conventional system controlled by a timer. Unlike the drain pump that continues to operate for a set period of time by timer control regardless of whether the tank is empty or not, the drain pump may stop while leaving water in the tank, or even if the water in the tank has been completely drained. This is extremely rational as it can prevent the drain pump from being operated unnecessarily.

In the above embodiment, when the second idling state of the drain pump motor 1 is detected, it is assumed that the tank has been completely drained and the draining process is terminated. The drainage process may be ended at the end of the process.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings; for example, when idling of the drain pump motor 1 is detected, the rotation speed of the drain pump motor 1 is controlled to be reduced, etc. Of course, modifications may be made as appropriate without departing from the above.

[Effects of the Invention] As is clear from the above description, the present invention includes a drainage pump idle detection means based on the current flowing through the drainage pump motor;
U] Since we have provided a control means that controls the drain pump motor when the idling state of the water pump is detected, it is possible to detect the idling state of the υl water pump and take measures to prevent the water in the tank from idling. It has the excellent effect of completely discharging the waste.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is a block diagram showing the electrical configuration, Fig. 2 is a characteristic diagram of the drainage pump motor, and Fig. 3 is a flowchart l'l-l for explaining the operation. It is ~. In the drawing, 1 is a drainage pump motor, 4 is a current value detection unit, and 6 is a drain pump motor.
Reference numeral 7 indicates a reference current value generation section, 7 indicates a current value comparison/judgment section, 8 indicates an idling detection means, and 9 indicates a control section (control means). Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1. In a device equipped with a drainage pump for discharging water in a tank, an idling detection means for detecting the idling state of the drainage pump based on the current flowing through the drainage pump motor; A washing machine with a drain pump, comprising: a control means for controlling the drain pump motor when idling of the drain pump is detected. 2. The control means for controlling the drain pump motor is configured to stop the drain pump motor for a predetermined period of time when an idling state of the drain pump is detected, and restart the drain pump motor after that. A washing machine with a drain pump according to item 1. 3. The control means for controlling the drain pump motor is configured to stop the drain pump motor for a predetermined period of time and restart the drain pump motor after repeating the operation control for a predetermined number of times when an idling state of the drain pump is detected, and then terminates the drain stroke. A washing machine with a drain pump according to claim 1, characterized in that the washing machine is configured as follows.