JPH0438994A - Hydrating apparatus - Google Patents

Abstract

PURPOSE:To pass over the resonance point so quickly that an outer drum is not effected by the resonance and the vibration of the outer drum during the attenuation period of dehydrating action is diminished, by a method wherein, when the attenuating rotating speed reaches a specified one after hydration is carried out at a normal rotating speed, a controller quickly reduces the rotating speed of the drum. CONSTITUTION:A hydrating process consists of a transit period in which a dehydrating motor 70 is started up and reaches the normal rotating speed, a normal operation period during which the motor is operated at the normal rotating speed, and an attenuating period in which the normal rotating speed drops to zero. As the hydrating motor 70 is off during the attenuating period, the rotating speed falls gradually. During this period, a microcomputer 76 senses the rotating speed of a drum 42, according to the on-off signals of a lead switch 73, and supplies power to a washing motor 68 when the rotating speed becomes less than 200r.p.m. As the washing motor 68 makes the drum 42 rotate at 50r.p.m., the rotating speed of the drum 42 is sharply reduced from 200r.p.m. to 50r.p.m. The sharp drop in the rotating speed allows passing over the resonance point in a moment so that the vibration of the outer drum is reduced.

Description

[Detailed description of the invention] (b) Industrial application field The present invention relates to a drum type dehydrator.

(B) Conventional technology As a conventional example, an outer tank is elastically supported within a frame, a horizontal shaft type drum is rotatably supported within the outer tank, and by rotating the drum, A drum-type washing machine that washes, dehydrates, and dries loaded clothes was first introduced in 1983.
It is shown in Publication No. 34635 (D06F33102).

(C) Problems to be Solved by the Invention In general, in cases where the outer tank is provided with anti-vibration support for the purpose of suppressing vibration of the frame, as in the conventional example, the rotation of the drum is stopped from a stopped state during dewatering operation. In the process of reaching a steady state, or vice versa, in the process of damping, the rotational speed becomes as shown in Figure 13 (in the experimental example shown in the figure, about 16 Or, p,
At the time point m), a resonance phenomenon occurs and the vibration of the outer tank temporarily increases.

In the conventional example, since the rotor passes slowly through the resonance point during damped rotation, the influence of resonance on the outer tank is large, and there is a problem that the outer tank vibrates indefinitely.

The present invention relates to an improvement of a dehydrator and is intended to solve these problems.

(d) Means for Solving the Problems The dehydrator of the present invention includes an outer tank elastically supported within a frame, a drum rotatably supported within the outer tank, and a mechanism for rotating the drum. By rotating the drum at high speed, the clothes in the drum are dehydrated by centrifugal force, and the attenuated rotation after the dehydration is performed at a steady rotation reaches a predetermined rotation speed. A control means is provided for rapidly decelerating the rotation of the drum when the rotation of the drum occurs.

(e) Effect, for example, the number of rotations of the drum during damping rotation is 150
If the resonance phenomenon occurs around r, p, and m,
Conventional drum rotation speed has changed from 200 r, p, m to 5 Or
, p, and m, which took 20 seconds to decay, are forcibly reduced in 5 seconds. As a result, the resonance point is passed instantaneously, and there is no time for the influence of resonance to reach the outer tank.

(f) Example Embodiments of the present invention will be described based on the drawings.

1 is a frame made of sheet metal, 2 is an outer tank made of synthetic resin and formed in the shape of a horizontal drum, 3 is a horizontal support surface formed on the lower surface of the outer tank 2, and 4 is fixed to the support surface 3. The iron mounting is a board.

5... are upper supports for elastically suspending and supporting the outer tank 2 from the upper four corners of the frame 1; 6...
The outer tank 2 is attached to a lower support disposed between the root 4 and the bottom of the frame 1, and 7 is integrally formed by making the upper part of the outer tank 2 protrude upward into a rectangular tube shape. This is a cylindrical body with a cylindrical body, which allows a clothes input port B8 to be provided at the top of the outer tank 2.
is formed. Reference numeral 9 denotes a top plate made of synthetic sugar fixed to the upper end of the frame 1, and the front edge has an operating section 9a for accommodating electronic components, etc., and the rear edge has an accommodating section 9b for accommodating a water supply device, etc. Each has a bulging shape, and a rectangular clothing input port AIO is provided in the center. 11... are various operation keys arranged on the upper surface of the operation section 9a. 12
is a bellows-shaped rubber gasket, which connects the clothes input port AIO and the clothes input port B8 in a watertight manner.

13 is a safety cover for opening and closing the clothes input port AIO 1
Reference numeral 4 denotes an upper lid that opens and closes the upper surface of the safety cover 13.

Now, only the rear wall 2a of the outer tub 2 is formed separately, and the rear wall 2a is fixed after a washing drum, which will be described later, is housed through the rear opening of the outer tub 2. Reference numeral 15 designates an introduction opening integrally formed in the center of the rear wall 2a to protrude inward, and reference numeral 16 designates a ventilation duct integrally formed on the outer surface of the rear wall 2a, extending from the upper center to the introduction opening 15. It is formed. 17 is a drum rear bearing fixed within this air duct 16. Further, the air duct 16
A heater casing 18 is formed in the upper part of the heater casing 18, and a sheathed heater A19 is installed therein. Reference numeral 20 denotes an iron plate surrounding the heater A19, and is used to prevent the resin material from catching fire even if a lump or the like ignites.

Reference numeral 21 indicates an overflow port provided at a height of 1/2 of the rear wall 2a, 22 indicates an overflow chamber integrally formed with the rear wall 2a, and is used to drain out water from the overflow port 21; 23.2
3 is a pair of electrodes arranged in the overflow chamber 22 to detect abnormal foaming; 24 is an air trap integrally formed in the lower part of the rear wall 2a; and 24 is an air trap arranged in the housing part 9b It is connected to a water level sensor 25 via a pressure hose 26. A circulation duct 27 is integrally formed at a position above the overflow level of the rear wall 2a, and communicates with the inside of the outer tank 2 through a circulation port 28. Reference numeral 29 is a blower fan disposed in the circulation duct 27, and 30 is a connecting pipe connecting the circulation duct 27 and the blower duct 16.

Reference numeral 31 indicates a drain port provided at the bottom of the outer tank 2, and 32 indicates a drain hose for leading out the waste water from the drain port 31 to the outside of the machine.
2 is connected via an overflow hose 33. 3
Reference numeral 4 designates a drain electric valve that opens and closes the drain port portion 31. As is well known, the valve is opened by winding a wire with the rotational force of the drain motor 35, and the valve is opened by cutting off the rotational force of the motor. It returns to the closed state due to the bias of the spring.

36 is a dual water supply solenoid valve device installed inside the housing portion 9b, one water supply valve A36a is connected to a water supply hose A37.
The other water supply valve B56b is connected to a part of the upper front corner of the outer tank 2 via a water supply hose B39. That is, the water discharged from the water supply hose B39 falls along the inner surface of the front wall of the outer tank 2 and reaches the drain port 31.

40 is a sheathed heater B disposed at the inner bottom of the outer tank 2.
, 41 is a drum front bearing fixed to the center of the front wall of the outer tank 2.

Now, 42 is a horizontal shaft type washing/dehydrating/drying drum made of synthetic resin that is rotatably supported in the outer tank 2, and is attached to a rear open type body part 43 and a rear side of the body part 43. It consists of a fluid balancer 44 and a rear plate 45 fixed to the rear side of the balancer 44.

46, 47, 48 are 12 along the inner circumferential surface of the body 43.
A baffle with a triangular cross section that bulges out at every 0 degrees, 49.
. . . indicates a large number of through holes 50 bored around the body portion 45.
. . . are horizontal ribs A that are integrally provided along the inner circumferential surface of the body portion 43. The horizontal rib A50 is also formed on the upper surface of the baffle.

A suction port 51 that faces the introduction opening 15 is formed protrudingly in the center of the rear plate 45.
A support shaft 52 is fixed to the center of the. Furthermore, an axial fan that also serves as a filter is integrally formed in the suction port 51. 53 is a support shaft fixed to the center of the front plate of the body 43. That is, during drying, drying air flows through the air blower fan 29 - connection pipe 30 - heater A 19 - air duct 16 - suction port 51 - inside of drum 42 - circulation port 2.
8-circulation duct 27-blow fan 29-... Further, during this drying, the water supply valve B56b is driven to supply water along the inner surface of the outer tank 2, and the drying air is cooled and dehumidified by this water supply.

Now, 54 is a recess formed by reducing the diameter of a circular arc portion with a central angle of about 120 degrees in the body 43, and 58 is a rectangular clothes slot C opened at the bottom of this recess 54. , is provided near one end of the bottom surface 57 of the recess 54, and its size occupies the area of the bottom of the recess 54. 59.60 is the recess 5
The slide groove formed on the front and rear edges of the bottom of 4, the rear 59
is constructed by attaching a separate slide cover 61.

Reference numeral 62 denotes a synthetic resin lid for opening and closing the input port C58, and it slides within the recess 54 by being supported within the slide grooves 59 and 60. Reference numeral 63 denotes a locking/disengaging mechanism formed between one side edge of the lid 62 and the mouth edge of the input port C58, and 64 and 65 denote a storage recessed integrally in the center of the upper surface of the lid 62. This is the place where laundry treatment agents such as detergent, bleach, and fabric softener are stored in advance.

The drum 42 is connected to the drum rear bearing 17 and the drum front bearing 4 with its support shafts 52 and 53.
1 is rotatably supported. At this time, the support shaft 5
3 protrudes from the front wall 2b of the outer tank 2, and a drive pulley 67 is fixed thereto.

Now, 68 is the washing motor which is fixed to the plate 4 through the metal fitting A69, and 70 is the washing motor which is attached to the plate 4.
The washing motor 68 and the dewatering motor 70 are connected to each other via a pulley and a belt, respectively.

72 is a magnet attached to the drive pulley 67; 73 is a reed switch disposed in the outer tank 2 at a position closest to and facing the magnet 72;
As the magnet 72 rotates, the magnet 72 closes when it approaches,
If you separate it, it will open up. That is, when the reed switch 73 opens and closes once, the drum 42 rotates once, so it is used as a means for detecting the rotational speed of the drum 42 and also as a means for detecting the rotational position of the drum 42. be done.

Reference numeral 74 denotes a first negative characteristic thermistor disposed within the heater casing 18, and constitutes a part of a first temperature detection circuit to be described later. Reference numeral 75 denotes a second negative characteristic thermistor disposed near the bottom of the outer tank 2, and constitutes a part of a second temperature detection circuit to be described later.

Next, a specific circuit of the washing/dehydrating/drying machine of this embodiment will be explained based on FIGS. 7 and 8.

76 is a microcomputer (for example, LC6523 model manufactured by Sanyo Electric Co., Ltd., hereinafter referred to as a microcomputer) which is the central part of the control, and its configuration is as well known as CPU 77
(central processing unit)
, RAM 78 (random access m
memory), ROM79 (read only me
80, a system bus 81, and input/output devices 82 and 83.

The CPU 77 is composed of a control section 84 and a calculation section 85. The control section 84 takes out and executes instructions, and the calculation section 85 executes operations according to control signals from the control section 84 during the instruction execution stage. It is used to store operational data such as binary addition, logical operation, increase/decrease, and comparison for data given from an input device or memory, and the R
The OM 79 is used to load in advance the means for operating the device, the settings for conditions for judgment, the rules for processing various types of information, and the like.

The microcomputer 76 includes the various operation keys 11.
... an input key circuit 86, the water level sensor 25, a safety switch 87 that opens and closes in conjunction with the opening and closing of the top lid 14, the reed switch 73, the reference pulse generation circuit 88, and the electrode for detecting abnormal bubbling. 23, 23, the signals from the first temperature detection circuit 89 and the second temperature detection circuit 90 are input, and the microcomputer 76 controls the forward and reverse rotation of the washing motor 68, the dewatering motor 70,
The water supply solenoid valve A36a, the water supply solenoid valve B56b, the drain valve motor 35, the ventilation fan 29, the drying heater A19, the heater B40, the buzzer sounding circuit 91
, LE consisting of various light emitting diodes (LEDs)
Drive signals are sent to the D drive circuits 92, respectively. In addition, the microcomputer 76 and each load are bidirectional cyrisks 93 to 10.
1, and the microcomputer 76 sends out ON and OFF signals for the bidirectional cyrisks 93 to 101.

The water level sensor 25 detects a change in the water level in the outer tank 2 as a pressure change in the air trap 24, moves a magnetic body within the coil according to this pressure, and as a result changes the water level as a change in the inductance of the coil. detected as,
Furthermore, this inductance change is detected as a change in oscillation frequency and is input to the microcomputer 76. Thereby, the microcomputer 76 continuously detects the water level in the outer tank 2 over a wide range based on the change in the oscillation frequency.

Further, the microcomputer 76 counts the open/close signal from the reed switch 73 every time it is input, and determines the number of rotations (r, p, m) of the drum per unit time.

The reference pulse generation circuit 88 is composed of a transistor, various resistors, and a capacitor, and receives a full-wave rectified signal of the secondary voltage of a transformer (not shown) at its input terminal.
From its output terminal, a pulse synchronized with the zero-crossing point of the commercial power supply voltage is input to the microcomputer 76.

Based on this reference pulse, the microcomputer 76 appropriately controls ON and OFF of the bidirectional cyrisks 99 to 101 for driving the washing motor 68 and the dehydration motor 70 in units of half cycles of the AC power supply voltage. . That is,
As shown in Fig. 9, if the power supply voltage is energized at a rate of n times per m times in units of half cycles, the rotational speed of the motor will be approximately n/m compared to continuous energization. (referred to as m-pulse cut control).

Further, by performing 1/2 pulse cut control and applying a half wave to the motor, a braking force can be applied to the motor (this is called DC braking).

Thus, the washing machine of this embodiment performs washing, intermediate dewatering, first rinsing, intermediate dehydration, and second washing under the control of the microcomputer 76.
The steps of rinsing, final dehydration, and drying are performed in sequence.

During the washing process, the washing motor 68
The drum 42 is slowly reversed at a low speed (approximately 5 Or, p, m), and the laundry in the drum 42 is swept up by the baffles and falls from above to below, which is the so-called beating washing process. , are rubbed by the horizontal ribs A50... Furthermore, during this time, the washing water flows through the heater B4.
0 to improve cleaning efficiency.

Further, during the dewatering process, the drum 42 is rotated in one direction at a high speed (approximately 80 Or, p, m) by the dehydrating motor 70, and the laundry in the drum 42 is dehydrated by centrifugal force.

Further, during the drying process, the drum 42 is repeatedly reversed at low speed by the washing motor 68, and drying air heated by the heater B40 is introduced into the drum 42 from the air duct 16 and the suction port 51. heat exchange with the laundry in the drum 42.

The operation based on such a configuration will be explained with reference to FIG.

The dewatering step includes a transient period until the dehydrating motor 70 starts to rotate at a steady rate, a steady period during which the dehydrating motor 70 is driven at a steady rotation,
It consists of a damping period in which the rotational speed is damped until it reaches zero.

During the damping period, the dehydration motor 70 is turned off, so the rotation speed gradually decreases.

Between 2 and 0, the microcomputer 76 switches the lead switch 73
The rotation speed of the drum 42 is detected based on the opening/closing signal (S-1), and when the rotation speed becomes 20 Or, p, m or less, the washing motor 68 is energized (S-2). This washing motor 68 rotates the drum 42 by 50r, p, m.
Since the drum 42 is rotated at 20
The speed will be rapidly decelerated from 0 r, p, m to 5 or, p, m.

That is, the washing machine of this embodiment has 200 r, p, m and 50
A resonance phenomenon occurs when the rotation speed reaches approximately 16 Or, p, m, which is between r, p, and m, but in this way, the rotation speed is increased from 20 Or, p, m to 5 Or, p, m By rapidly decelerating, the resonance point is passed instantaneously, and vibration of the outer tank 2 due to the influence of resonance is reduced.

The washing motor 68 is energized for 3 seconds, after which it is naturally decelerated (S-3).

Figure 11 is a graph showing the difference from the conventional example.The conventional example, which is naturally decelerated (solid line A), passes through the resonance point P slowly, so the influence time due to resonance (for example, in the figure width X) becomes longer, and as a result, the vibration time of the outer tank 2 becomes longer.

On the other hand, in this example (solid line B), the rotation speed is 20
At the point when Or, p, m is reached (point Q), rapidly 50r, p
, m (point R), it quickly passes through the resonance point P and the time affected by resonance (width Y in the figure) can be shortened, and as a result, the vibration time of the outer WI2 can be shortened. .

Further, in this embodiment, the rotational speed of the drum 42 needs only to be suddenly reduced, and the washing motor 68 is energized in (S-2), but as another means, the washing motor 68 may be
Alternatively, the dewatering motor 70 may be subjected to DC braking or pulse cut control may be performed.

Next, a second embodiment of the present invention will be described.

In the first embodiment, two motors, the washing motor 68 and the dewatering motor 70, are used to drive the drum 42, but in order to share these motors, the first
As shown in FIGS. 3 and 14, a so-called inverter motor 1 whose rotation speed can be changed depending on the applied frequency
02 may be adopted. In the figure, reference numeral 103 denotes a frequency conversion circuit that converts the commercial power frequency to an arbitrary frequency according to a command from the microcomputer 76 and applies the frequency to the inverter motor 102. Incidentally, since the inverter motor and the frequency conversion circuit are conventionally well known, a detailed structural explanation thereof will be omitted.

The following table shows the relationship between the frequency applied to this inverter motor and the rotational speed of the drum at that time. For example, if it is desired to set the rotational speed of the drum 42 to approximately 20 Or, p, m, a frequency of 50) 1z may be applied.

In this embodiment, the number of revolutions of the drum 42 is 803 and 5 r during the decay period of the dewatering process.
, p, m to 214. The microcomputer 76 instructs the frequency conversion circuit 103 to apply a frequency from 187° 5 Hz to 50.0 Hz to the inverter motor 102 in stages so that the frequency decreases to Or, p, and m in 30 seconds.

In other words, the inverter motor 102 is controlled every 2 Hz, which is 1/6 of the fundamental frequency (the frequency in the washing process, which is 12.5 Hz in the previous table, but is assumed to be 12 Hz here for the sake of explanation). It is possible.

Now, if you try to slow down from 100Hz to 50Hz,
The frequency can be lowered step by step in the order of 100-98 to 96--54-52-50. And 1
If you want to decelerate from 00Hz to 50Hz in 25 seconds, there are 25 frequencies from 100)1z to 50Hz, so you can reduce the frequency by 2Hz every second.

As mentioned above, the same control is performed to lower the frequency stepwise from 187.5 Hz to 50.0 Hz.

After that, the number of rotations of the drum 42 is increased to 5 per second.
12.5H2 to decrease to 3,5 r, p, m
The frequency conversion circuit 103 is instructed to apply frequencies up to 100% to the inverter motor 102 in stages.

In this second embodiment, the motor 102 is
Since the rotational force of the motor 102 is constantly transmitted to the drum 42, the damping characteristics are extremely good, and as shown by the solid line C in FIG. The vibration time of 2 can be greatly shortened.

(G) Effects of the Invention The dewatering machine of the present invention can reduce the vibration of the outer tank during the damping period of the dewatering operation.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the washing machine according to the present invention, Fig. 2 is a side sectional view, Fig. 3 is a longitudinal sectional view, Fig. 4 is a rear view with the main parts cut away, and Fig. 5 is the same main parts. A cross-sectional front view, Figure 6 is an exploded perspective view of the body, Figure 7 is an electrical circuit diagram,
Figure 8 is a configuration diagram of the microcomputer, Figure 9 is an explanatory diagram of pulse cut control, Figure 10 is a flowchart showing the operation during the decay period of the dehydration process, Figure 11 is a characteristic graph of the decay period, and Figure 12 is the dehydration process. Characteristic graph showing rotational resonance phenomenon, 13th
This figure is a diagram corresponding to FIG. 5 in the second embodiment, and FIG. 14 is a block diagram of the main parts. 1. Frame, 2. Outer tank, 42. Drum, 68.
- Washing motor, 70... Dehydration motor, 76... Microcomputer (control means), 102... Inverter motor (68, 70, 102: drive means).

Claims (1)

[Claims] (1) An outer tank elastically supported within a frame, a drum rotatably supported within the outer tank, and a driving means for rotating the drum, the drum being rotated at high speed. By this, the clothes in the drum are dehydrated by centrifugal force, and when the attenuated rotation after dehydrating with steady rotation reaches a predetermined rotation speed, the rotation of the drum is rapidly and forcibly stopped. A dehydrator characterized by being equipped with a control means for decelerating the speed.