JPH057698A - Dehydrating machine - Google Patents

Abstract

PURPOSE:To recognize the abnormality of a braking device without fail by measuring time to the stop of a motor according to the detected information of a turning speed detecting means to detect the turning speed of the motor and operating an alarming means when it is judged that the measured time is longer than prescribed time. CONSTITUTION:When it is judged that a lid is opened during a dehydrating operation according to an input from a lid switch 27, power supply to a motor 6 is stopped and the braking device is operated so as to stop the dehydrating operation. Next, according to an input from a turning speed detection circuit 22, an operation control circuit 21 measures the time to the stop of the motor 6 receiving the braking force of the braking device. When it is judged that the measured time is longer than the prescribed time, an alarm 32 is operated. Thus, the reduction of the braking force of the braking device can be recognized without fail and safety is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dehydrator capable of detecting an abnormality in a brake device.

[0002]

2. Description of the Related Art Conventionally, in a dehydrator (generally, a dehydrating washing machine and a dehydrating function portion of a two-tub type washing machine at present), a lid is attached during a dehydrating operation in which a dehydrating tank is rotationally driven by a motor. When released, for safety, the motor is immediately turned off, and at the same time, the brake device is operated to brake the dehydration tub.

According to the standard, the time until the dehydration tub is stopped when the brake is suddenly applied is 15 seconds or less, but when the braking force of the brake device is reduced, the time until the dehydration tub is stopped is long. As a result, there is a risk that the user will be accidentally caught in a finger or the like.

Therefore, conventionally, a label is attached to the main body to instruct the user to request a repair if the time required for stopping the dehydration tank during the sudden braking exceeds the standard time. It calls attention.

[0005]

However, the above-mentioned label alone is reliant on the user, is not sure, and leaves a danger.

The present invention has been made in view of the above circumstances, and therefore an object thereof is to be able to more reliably know the decrease in the braking force of a brake device and to improve safety. To provide a dehydrator.

[0007]

In order to achieve the above object, in the dehydrator of the present invention, a dehydration tub is driven to rotate by a motor for dehydrating laundry, and the dehydration tub is faced. A lid that opens and closes the laundry entrance and exit, a brake device that brakes the dehydration tub, and a rotation speed detection unit that detects the rotation speed of the motor, and a notification unit that notifies an abnormality of the brake device; When the lid is opened, the time taken until the motor is braked by the brake device and stopped is measured from the detection result by the rotation speed detection means, and the notification means is activated when the measured time is determined to be a predetermined time or more. It is characterized by comprising a control means for controlling the operation.

[0008]

When the braking force of the brake device decreases, the time required to stop the motor along with the dehydration tub also increases. Therefore,
By measuring the time until the motor is stopped from the detection information by the rotation speed detection means for detecting the rotation speed of the motor, and activating the notification means when it is determined that the measurement time is equal to or longer than the predetermined time, The user can know the abnormality of the brake device with a more reliable operation of the notification means.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a washing machine combined with dehydration will be described below with reference to the drawings.

First, FIG. 2 shows an outer box 1 of the entire washing machine for combined use of dehydration.
, And the tanks 2 and 3 are arranged in double inside and outside. Of these, the inner tub 2 functions both as a washing tub and as a dewatering tub. A large number of dewatering holes 4 are formed in the peripheral wall of the inner tub 2, and an agitator 5 is provided in the inner bottom portion.
Also, the outer tank 3 functions as a water receiving tank.
In addition to the motor 6, a belt transmission mechanism 7 for transmitting the rotational force thereof, a clutch mechanism 8 for switching the transmission of the rotational force to the inner tank 2 and the agitator 5, and braking and release of braking of the inner tank 2 are provided on the outer bottom portion. A mechanical unit 10 having a brake device 9 and the like is provided, and a drain valve 11 and a drain hose 12 are also provided. Here, the drain valve 11 and the clutch mechanism 8
The brake device 9 is driven by a single drive source, whereby the stirring body 5 receives the rotational force of the motor 6 while the drain valve 11 is closed and the inner tub 2 is stopped during washing. The rotational force of the motor 6 is transmitted to the inner tank 2 and the stirring body 5 which are transmitted and the drain valve 11 is opened and released during dehydration.

On the other hand, a top cover 13 is mounted on the outer box 1, and there is a laundry inlet / outlet (not shown) facing the inner tub 2, and a lid 14 for opening / closing the same is pivoted. It is set up.

Next, the electric circuit shown in FIG. 3 will be described. A direct current constant voltage circuit 16 is connected to the alternating current power source 15 and its direct current output is given to each circuit described below by lines La and Lb. ing. A rectifying / smoothing circuit 17 is also connected to the AC power supply 15, and a DC output of the rectifying / smoothing circuit 17 is supplied to an inverter main circuit 19 forming a part of the motor drive control device 18. In this case, the voltage is applied to the motor 6, which is a three-phase DC motor, at the energization timing corresponding to each phase of the coil. This applied voltage is determined by the PWM control for the output voltage of the rectifying / smoothing circuit 17, and the PWM control is performed by the inverter control circuit 20 that constitutes the motor drive control device 18 together with the inverter main circuit 19. It is supposed to be done. Further, the inverter control circuit 20 receives signals from the three position detection elements 6a, 6b, 6c that detect the rotational position of the rotor magnet of the motor 6, specifies the energization timing based on the signals, and controls the microcomputer. The applied voltage is specified on the basis of a command from the operation control circuit 21, which is a control means including the above.

Each position detecting element 6a, 6b, 6 of the motor 6
From c, a rotation speed detection circuit 2 which is rotation speed detection means
2 is also given a signal, and the rotation speed detection circuit 22 detects the rotation speed of the motor 6 based on the signal, and transfers the detection signal to the operation control circuit 21 for feedback control. It has become.

The operation control circuit 21 receives inputs from the initialization circuit 23 and the oscillation circuit 24, and also receives inputs from the various operation switches 25.
Further, inputs are provided from a water level sensor 26 that detects the water level in the outer tub 3 and a lid switch 27 that responds to the opening and closing of the lid 14, and based on these inputs, the operation control circuit 21 , A motor 2 as a drive source for the drain valve 11, the clutch mechanism 8 and the brake device 9 described above.
8 is connected between the AC power supply 15 and the AC power supply 15 to control ON / OFF of the triac 29 that controls the power supply and disconnection, and is also connected between the AC power supply 15 and the electromagnet 30 that is the drive source for the water supply valve. Triac 3 who is in charge of the disconnection
1 is turned on and off, and an annunciator 32 such as a light emitting diode which is an announcing means for announcing the abnormality of the brake device 9 is also turned on and off.

Therefore, the contents of control by the operation control circuit 21 will be described below.

As shown in FIG. 1, the operation control circuit 21 includes
At the stage of starting the dehydration (step S1), the inner tub 2 and the agitator 5 whose braking by the brake device 9 is released are rotated by the motor 6 to dehydrate the laundry. It is judged whether or not the lid 14 is opened by the input from 27 (step S2).

If it is determined that the lid 14 has been opened, the motor 6 is de-energized and the brake device 9 is operated to stop the dehydration operation (step S3). The time t until the motor 6 which receives the braking force of the brake device 9 is stopped together with the inner tank 2 by the input is measured (step S4). Then, next, it is judged whether or not the measured time t is a predetermined time T (for example, 15 seconds) or more (step S5), and if it is judged that it is the predetermined time T or more, the alarm 32 is operated. (Step S6).

If it is determined in step S5 that the time is not longer than the predetermined time T, it is next determined whether or not the lid 14 is closed by the input from the lid switch 27 (step S7), and the lid is closed. When it is determined that it has been performed, the process returns to the previous step 1.

If it is determined in step S2 that the lid 14 is not opened, then it is determined whether or not the dehydration time is over (step S8), and it is determined that it is over. By the way, when the motor 6 is cut off and the rotation of the motor 6 is sufficiently lowered, the brake device 9 is operated,
The dehydration operation ends (step S9).

As described above, in the present structure, the rotation speed detection circuit 2 for detecting the rotation speed of the motor 6 until the motor 6 stops when the lid 14 is opened during dehydration.
The notification device 32 is operated when the measurement time is determined from the detection information of 2, and the measurement time is determined to be a predetermined time or more, and the user can operate the notification device 32 more reliably. Since it is possible to know the abnormality of the brake device 9 (reduction of braking force), the safety can be greatly improved as compared with the conventional label only.

In addition to the above, particularly in the above embodiment, the rotation speed detection circuit 22 is provided as a means for changing the rotation speed of the motor 6, and the rotation speed detection circuit 22 is connected to the brake. Since it can be used as it is for the abnormality notification of the device 9, the cost can be kept low.

However, the present invention is not limited to the embodiment described above and shown in the drawings. Therefore, the rotation speed detection circuit 22 may be provided exclusively for informing the abnormality of the brake device 9, and , The whole is not a washing machine for both dehydration and
The present invention can be similarly applied to the two-tub type washing machine, and in addition, the specific parts of the notification means and the like can be appropriately changed and implemented within a range not departing from the gist.

[0023]

As is clear from the above description, the dehydrator of the present invention is for dehydrating laundry by rotationally driving the dehydration tub by a motor, and the laundry inlet / outlet facing the dehydration tub. A lid that opens and closes, a brake device that brakes the dehydration tub, and a rotation speed detection unit that detects the rotation speed of the motor are provided. The notification unit notifies the abnormality of the brake device, and the lid is opened during the dehydration. Occasionally, the time until the motor is stopped by being braked by the brake device is measured from the detection result by the rotation speed detection means, and the control for activating the notification means when it is determined that the measured time is a predetermined time or more It is provided with a control means for enabling the user to activate the notification means,
This is more reliable, and has an excellent effect that the abnormality of the brake device can be known and the safety can be greatly improved.

[Brief description of drawings]

FIG. 1 is a flowchart for explaining the operation of an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of the washing machine for combined use of dehydration.

FIG. 3 is a schematic electrical configuration diagram.

[Explanation of symbols]

2 is an inner tank (dehydration tank), 6 is a motor, 9 is a brake device,
Reference numeral 14 is a lid, 21 is an operation control circuit (control means), 22 is a rotation speed detection circuit (rotation speed detection means), and 32 is an alarm (notification means).

Claims (1)

Claim: What is claimed is: 1. A dehydration tub is rotationally driven by a motor for dehydrating laundry, and a lid for opening and closing a laundry entrance and exit facing the dehydration tub, and a dehydration tub. A brake device for braking the rotation speed of the motor, and a rotation speed detection means for detecting the rotation speed of the motor; and an informing means for informing an abnormality of the brake device, and the rotation speed detection means when the lid is opened during the dehydration. A control means is provided for measuring the time from the detection result until the motor is stopped by being braked by the brake device, and for activating the notification means when the measured time is determined to be a predetermined time or more. A dehydrator characterized by.