JP2693275B2 - Drum type washer / dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum type drum which doubles as a washing tub and a dehydrating tub and is horizontally supported, and the drum is operated at low rotation for washing and drying and at high rotation for centrifugal dehydration. Regarding washing and drying machines.

[0002]

2. Description of the Related Art Generally, in this type of drum type washing machine, washing, dehydration and drying are performed by changing the number of rotations of the drum. When a motor is used and it is attempted to change the number of rotations during washing, drying and dehydration, the commutator motor has a short life and needs to be replaced within a short period of time.
It is also possible to change the number of revolutions by converting the number of poles of the induction motor, but in that case, the number of revolutions at the time of washing, drying and dehydrating is limited, and it is not possible to limit to the desired number of revolutions Both tasks could not be performed efficiently.

The present invention has been made in view of the above points, and employs a brushless motor to improve the durability of the motor and to set both the drum rotation speed during washing and dehydration to a desired rotation speed. Is.

By adopting a brushless motor, brush wear that can occur in the case of a commutator motor is eliminated, and durability is greatly improved. On the other hand, the current brushless motor has a high torque comparable to that of a commutator motor. It is very expensive to put out. Further, since the maximum rotation speed is lower than that of the commutator motor, if the reduction ratio is increased and the motor is used with high torque, the dehydration rotation speed becomes low and the dehydration performance becomes insufficient.

Therefore, the present invention adopts gear deceleration during low speed rotation of washing and can be used with high torque, while at the time of high speed rotation of dewatering, the gear deceleration is stopped by the clutch for switching motors and the centrifugal clutch to provide sufficient dewatering performance. It is an object of the present invention to provide a drum type washer / dryer capable of operating at a rotation speed that can be secured.

[0006]

The drum type washer / dryer of the present invention includes a main body case, a rotary drum which serves as a washing tub and a dehydrating tub, and is horizontally supported in the main body case.
A drive motor comprising a brushless motor and a rotary power transmission means for transmitting the rotary power of the drive motor to the rotary drum are provided, and the rotary power transmission means is coaxial with the drive shaft of the drive motor and the outer periphery of the drive shaft. An output shaft provided so as to be relatively rotatable, a belt pulley fixed to the output shaft, a belt suspended between the belt pulley and a rotating drum, and a deceleration for decelerating the rotational power from the drive shaft. A gear mechanism, a motor clutch that transmits decelerating rotational power from this reduction gear mechanism to the output shaft only during washing / drying operation, and the drive shaft that is fixed to the drive shaft. Rotational power from the drive shaft is applied to the belt pulley during dehydration operation. The motor includes a centrifugal clutch for switching and transmission, and a motor clutch drive circuit, and a motor after detecting whether the drive circuit can normally drive the motor clutch. It is composed of a control circuit for driving the latch drum type washing and drying machine.

That is, the present invention uses a brushless motor (variable speed motor) as a drive motor for the rotary drum,
During washing / drying operation, the motor clutch operates the reduction gear mechanism to transmit high-torque power due to deceleration, while during dehydration operation, the centrifugal clutch is operated to directly transmit high-speed rotation power from the drive shaft of the brushless motor to the rotating drum. You can Further, the control circuit drives the motor clutch after detecting whether or not the drive circuit can normally drive the motor clutch, so that the washing / drying machine is always safely operated.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 schematically shows the structure of a drum type washer / dryer according to an embodiment of the present invention. First, the schematic structure thereof will be described. 1 is an exterior body as a main body case,
2 is a water tank, 3 is a rotating drum that also serves as a washing tank and a dehydration tank, 4
Reference numerals a and 4b denote drum shafts that support the rotating drum 3, 2a and 2b bearings that respectively support the drum shafts 4a and 4b, and 5 that are fixed to the drum shaft 4b and transmit the rotation of the belt pulley 7 via the belt 6. A drum pulley 8 is a gear mechanism assembly 10a and 1 as a rotational power transmission means for changing the rotation of a brushless motor (variable speed motor) 9.
Reference numeral 0b is a water supply valve and a drain valve for supplying and draining the washing liquid or the tin liquid in the water tank 2.

FIG. 2 shows a cross section of the variable speed mechanism assembly 8 during operation in washing. Reference numeral 11 denotes a motor shaft of a motor 9, which has a sun gear 12 meshing with a planetary gear 13 and has a centrifugal clutch mechanism. Clutch arm 1 on weight 14
The rotational force is transmitted through the motor 5. Reference numeral 16 is a planetary gear support that supports the planetary gear 13 and is fitted with the motor clutch 17. Reference numeral 18 denotes an internal gear that meshes with the planetary gear 13, and is fixed by an outer box 19. The clutch motor 20 has a cam (not shown) built therein, and the lever 1
7 g is reciprocated in the axial direction of the motor 9. At the time of washing, the control plate 17d of the motor clutch 17 is in a state in which the guide pin 17h is pulled out from the roller 17b by the clutch motor 20.

The weight 14 of the centrifugal clutch mechanism does not come into contact with the pulley 7 due to the clutch spring 22 pulled inward because the rotation speed of the motor shaft 11 is low at 600 rpm or less (during washing). 6 is a front view showing the centrifugal clutch mechanism. In FIG.
4a is a lining.

FIG. 3 is a diagram for explaining the operation of the motor clutch at the time of washing, in which the roller (or roller) 17b is integrated with the retainer 17c by a spring and the inclined surface of the outer ring (planetary gear support 16) and the output shaft 23. It is pressed against to bite in between. When the outer ring (planetary gear support 16) is counterclockwise, the roller 17b is used, and when it is clockwise, the roller 17 is rotated.
The driving force is transmitted to each output shaft 23 by b '.
With the above configuration, the rotation of the motor 9 is decelerated by the planetary gear and the belt, that is, the planetary gear support 16, the motor clutch 17, the output shaft 23, the belt pulley 7, and the belt 6 are decelerated to a predetermined speed and transmitted to the drum 3. .

FIG. 4 is a sectional view showing the operation of the variable speed mechanism assembly during dehydration. The control plate 17 of the motor clutch 17 is shown in FIG.
When the clutch motor 20 is moved by the lever 17g, the guide pin 17h causes the roller 17b and the output shaft 23 to move.
The planetary gear support 16 is inserted between the
And the rotation of the output shaft 23 are free. In the clutch weight 14, the rotation speed of the motor shaft 11 is 600 rpm.
Because of the above and high speed rotation (during dehydration), the clutch weight 14
The centrifugal force of the clutch spring is pulled inward 2
The lining 14a comes into pressure contact with the pulley 7 by a force greater than 2. Therefore, the rotation of the motor 9 is released from the deceleration by the planetary gears and only the belt deceleration is transmitted to the drum 3 to transmit the dewatering rotation operation at a predetermined speed.

FIG. 5 is a transverse cross-sectional view of the operation of the motor clutch 17 during dehydration. The clutch motor 20 has a control plate 17d.
2 shows a state in which the outer ring (the planetary gear support 16) and the output shaft 23 are freely rotated by pushing in the guide pin 17h (through the plate when the roller push plate is inserted). In the figure, the guide pin 17h of the control plate 17d has a shape that allows free rotation in only one direction of the roller 17b, but it can be free in both directions.

FIG. 7 is an exploded perspective view of essential parts of the motor clutch 17 and the planetary gear support 16. FIG. 8 is a perspective view illustrating a case where the planetary gear support 16 is connected to the output shaft 23 by the motor clutch 17. 9 is a perspective view showing a case where the planetary gear support 16 is freed with respect to the rotation of the output shaft 23 by the motor clutch 17.

In the drum type washing machine having the above structure,
Drum rotation speed during washing is 50 rpm, drum load torque is 3
00Kg-cm, drum rotation speed at dewatering start is 80rpm, drum load torque is 150Kg-cm, drum rotation speed at dewatering
It was found that the operation was smooth when set to 1000 rpm and drum load torque of 30 kg / cm. The variable speed range is 20 (1000/50) when set with this specification. If the variable speed range of the brushless motor is set to 4 in consideration of the motor price, the gear shift is 5 (20/4). Also, from the torque characteristics of the motor used, the speed reduction ratio of the drum rotation to the pulley rotation was set to 1 / 1.5. With the above settings, the motor speed is 375 rpm during washing (gear deceleration 1/5, belt deceleration 1 / 1.5) and 600 rpm during dewatering start (gear deceleration 1/5, belt deceleration 1/1.
5) 1500 rpm (belt deceleration 1 / 1.5) when dehydrated, and the motor load torque is 40 Kg-cm (300 x gear deceleration 1/5 x belt deceleration 1 when washing.
/1.5) 20Kg ・ cm (150 × gear deceleration 1/5 × belt deceleration when starting dehydration
(1 / 1.5) It became 20 kg · cm (30 cm x belt deceleration 1 / 1.5) when dehydrated.

It will be understood that the motor rotation speed at which the centrifugal clutch operates can be set to 600 rpm or more and 1500 rpm or less from the above motor rotation. At that time, it is necessary to switch the clutch 17 by the clutch motor 20 and keep the output shaft 23 free from gear rotation.

FIG. 10 is an electric circuit diagram of a main part of the embodiment shown in FIG. 1, where MC is a control circuit incorporating a microcomputer, DP is an indicator for displaying various items, and KB is various washing / drying conditions. It is a control panel to input. LS is a limit switch built in the clutch motor 20, and when the lever 17g reciprocates by the clutch motor 20, the limit switch is switched according to the operation. e is an AC power supply, TR1 and TR2 are switches LS
It is a triac in which an AC power source is connected to the clutch motor 20 via. That is, when the triac TR1 is energized, the clutch motor 20 rotates and the guide pin 1
When 7h is pulled out from the roller 17b, and the pulling-out operation is completed, the limit switch LS is switched to the TR2 side, so that the clutch motor 20 is stopped. When the triac TR2 is energized, the clutch motor 20 rotates to insert the guide pin 17h into the roller 17b, and when the inserting operation is completed, the limit switch LS is switched to the triac TR1 side.
0 stops. CT is a current transformer that detects a motor current to confirm whether or not the clutch motor 20 is broken, and PC is a photo for detecting whether a normal voltage is applied to the clutch motor 20 from the AC power supply e. The coupler R is a current limiting resistance of the photocoupler PC. The control circuit MC receives outputs from the control panel CP, the current transformer CT, and the photocoupler PC, and outputs them to the display DP, the water supply valve 10a, the drain valve 10b, the motor 9, and the triacs TR1 and TR2. There is.

FIG. 11 is a flow chart showing the operation of shifting from the washing process of the embodiment shown in FIG. 1 to the dehydration process. In FIG. 11, at the start of washing, as described above, since the guide pin 17h is pulled out from the roller 17b, the rotating drum 3 rotates at a low speed, whereby the washing process is executed (step 101). . Next, at the start of dehydration, the control circuit MC keeps the triac TR2 for a short time (several meters).
s) is conducted, and whether or not a normal voltage is applied to the clutch motor 20 from the power source e from the output of the current transformer CT and the output of the photocoupler PC,
Then, it is confirmed whether or not the clutch motor 20 is disconnected (step 102). Clutch motor 2
When it is determined that the normal voltage is applied to 0 and there is no disconnection, the control circuit MC outputs the triac TR2.
To drive the clutch motor 20 to insert the guide pin 17h into the roller 17b (step 10).
3). When the insertion is completed, the limit switch LS is switched to the triac TR1 side. Then, the motor 9 is rotated at high speed, the rotational force thereof is transmitted to the rotating drum 3 via the centrifugal clutch mechanism as described above, the rotating drum 3 is rotated at high speed, and the dehydration process is executed (step 104). When the dehydration process is completed, the stop of the rotary drum 3 is confirmed by a sensor (not shown) (switch 105), and TR1 of the triac is turned on for a short time (several ms) to output the current transformer CT and the photocoupler PC. From the output, it is determined whether or not a normal voltage is applied to the clutch motor 20 from the power source e, and the clutch motor 2
Check whether 0 is not broken (step 10)
6). When it is confirmed that the clutch motor 20 is operating normally, the control circuit MC determines that the triac T
R1 is energized to drive the clutch motor 20 to pull out the guide pin 17h from the roller 17b (step 10
8) The operation ends. Note that steps 102 and 1
When it is determined in 06 that the clutch motor 20 is not normally driven, the clutch motor 20 is not driven and "failure" is displayed on the display DP.

The washing / dewatering process is executed in this manner, and in particular, at the time of transition from the washing to the dehydration process,
When the low speed rotation of the rotary drum 3 is switched to the high speed rotation, the clutch motor 20 that drives the motor clutch 7
Is trying to confirm whether or not it can operate normally.
Therefore, due to the malfunction of the clutch motor 20, the motor rotational force that is decelerated by the motor 9 rotating at a high speed and the motor rotational force that is not decelerated while the motor clutch 7 is not operating are simultaneously transmitted to the belt pulley, and the motor 9 is in the locked state. Accidents that will be prevented will be prevented.

[0020]

According to the present invention, it is possible to safely obtain the drum rotating force and rotating speed required for washing and dehydration by using a small motor.

[Brief description of the drawings]

FIG. 1 is a schematic configuration explanatory view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view for explaining a washing operation of the variable speed mechanism.

FIG. 3 is an operation explanatory view of the motor clutch at the time of washing.

FIG. 4 is a view corresponding to FIG. 2 when the variable speed mechanism is dehydrated.

FIG. 5 is a view corresponding to FIG. 3 when the motor clutch is dehydrated.

FIG. 6 is a front view of a centrifugal clutch.

FIG. 7 is an exploded perspective view of a motor clutch and a planetary gear support.

FIG. 8 is a perspective view showing one operating state of a motor clutch.

FIG. 9 is a perspective view showing another operating state of the motor clutch.

10 is an electric circuit diagram showing a control unit of the embodiment shown in FIG.

11 is a flowchart showing a main part of the operation of the embodiment shown in FIG.

[Explanation of symbols]

 1 Exterior Body (Main Body Case) 3 Rotating Drum 5 Drum Pulley 6 Belt 7 Pulley 8 Transmission Mechanism Assembly (Rotation Power Transmission Means) 9 Brushless Motor

Claims (1)

(57) [Claims] And 1. A main body case, also serves as a washing tub and drying tub, a rotary drum which is horizontally supported on the body case, blanking
A drive motor composed of a brushless motor and a rotary power transmission means for transmitting the rotary power of the drive motor to the rotary drum are provided. The rotary power transmission means is coaxial with the drive shaft of the drive motor and the outer periphery of the drive shaft. An output shaft rotatably provided, and a belt pulley fixed to the output shaft,
A belt hung between the belt pulley and the rotary drum, a reduction gear mechanism for reducing the rotational power from the drive shaft, and a deceleration rotational power from the reduction gear mechanism for the output shaft only during a washing / drying operation. And a centrifugal clutch that is fixed to the drive shaft and that switches the rotational power from the drive shaft to the belt pulley during dewatering operation, and the motor clutch drive circuit and the drive circuit are normal. A drum type washer / dryer having a control circuit for driving the motor clutch after detecting whether or not the motor clutch can be driven.