JPH04256784A - Drum type washing/drying machine - Google Patents

Abstract

PURPOSE:To execute the operation by necessary rotating force and at a necessary rotating speed by using a brushless motor, and transferring power of high torque by deceleration at the time of washing/drying operation, and transferring directly high speed rotation power at the time of dehydrating operation. CONSTITUTION:In a variable speed material groove assembly 8 for changing a speed of a rotation of a brushless motor 9, a motor shaft 11 of the motor 9 has a sun gear 12 engaged to a planet gear 13, and also, transfers rotating force through a clutch arm 15 to a weight 14 of a clutch of a centrifugal clutch material groove. A clutch motor 20 allows a lever 17g to execute a reciprocating operation in the axial direction of the motor 9, and at the time of washing, a control plate 17d of a motor clutch 17 is drawn out of a roller 17b, and the roller 17b is pressed so as to bite between the inclined surface of a planet gear supporting body 16 and an output shaft 23 by a spring formed integrally with a retainer. Accordingly, a rotation of the motor 9 is decelerated to a prescribed speed by the planet gear supporting body 16, the motor clutch 17, the output shaft 23, a belt pulley 7 and a belt 6, and transmitted to a drum 3.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention is a drum type in which a drum serving as both a washing tub and a dehydrating tub is horizontally supported, and the drum is operated at low rotation speeds for washing and drying, and high rotation speeds for centrifugal dewatering. Regarding washing and drying machines.

0002

[Prior Art and Problems to be Solved by the Invention] Generally, in this type of drum-type washing machine, washing, dehydration, and drying are performed by changing the number of rotations of the drum, but conventional commutator When using a motor to change the rotation speed during washing, drying, and dehydration, the commutator motor has a short lifespan, so the motor must be replaced within a short period of time. It is also possible to change the number of rotations by changing the number of poles of the induction motor, but in that case, the number of rotations during washing, drying, and dehydration would be limited, and it would not be possible to limit the number of rotations to the desired number. Both parties were unable to perform their tasks efficiently.

[0003] The present invention has been made in view of the above points, and uses a brushless motor to improve the durability of the motor and also allows the drum rotation speed during washing and dehydration to be set to a desired rotation speed. It is.

By the way, by adopting a brushless motor, brush wear that can occur in the case of a commutator motor is eliminated, and durability is greatly improved. It would be very expensive to sell it. Furthermore, since the maximum rotational speed is lower than that of a commutator motor, if the reduction ratio is increased and the motor is used at high torque, the dewatering rotational speed will be low and the dewatering performance will be insufficient.

Therefore, the present invention adopts a gear reduction during low speed rotation for washing, and can be used with high torque.On the other hand, during high speed rotation for spin drying, the gear reduction is stopped using a motor switching clutch and a centrifugal clutch to maintain sufficient spin drying performance. The purpose of the present invention is to provide a drum-type washer/dryer that can be operated at a secure rotation speed.

[0006]

[Means and effects for solving the problems] The drum-type washer/dryer of the present invention includes a main body case, a rotating drum that doubles as a washing tub and a dehydrating tank, and is horizontally supported in the main body case.
The rotary power transmitting means includes a drive motor and a rotary power transmitting means for transmitting the rotary power of the drive motor to the rotating drum, and the rotary power transmitting means is coaxial with the drive shaft of the drive motor and can rotate relative to the outer periphery of the drive shaft. an output shaft provided, a belt pulley fixed to the output shaft, a belt suspended between the belt pulley and the rotating drum, and a reduction gear mechanism that decelerates the rotational power from the drive shaft; A motor clutch that transmits the deceleration rotational power from this reduction gear mechanism to the output shaft only during washing/drying operation, and a centrifugal clutch that is fixed to the drive shaft and switches and transmits the rotational power from the drive shaft to the belt pulley during dehydration operation. The drum-type washer/dryer includes a clutch, and further includes a motor clutch drive circuit, and a control circuit that drives the motor clutch after detecting whether or not the drive circuit can normally drive the motor clutch.

That is, the present invention uses a brushless motor (variable speed motor) as a drive motor for a rotating drum,
During washing/drying operations, the motor clutch operates the reduction gear mechanism to provide high torque power through deceleration, while during dehydration operations, the centrifugal clutch is activated to directly transmit high-speed rotational power from the brushless motor's drive shaft to the rotating drum. Can be done. 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 washer/dryer is always operated safely.

[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, and the general structure will first be explained. 1 is the exterior body as the main body case,
2 is a water tank, 3 is a rotating drum that doubles as a washing tank and a dehydration tank, 4
a and 4b are drum shafts that support the rotating drum 3; 2a and 2b are bearings that support the drum shafts 4a and 4b, respectively; and 5 is fixed to the drum shaft 4b and transmits the rotation of a belt pulley 7 via a belt 6. A drum pulley, 8, is a transmission mechanism assembly, 10a and 1, serving as a rotary power transmission means for changing the rotation speed of a brushless motor (variable speed motor) 9.
Reference numeral 0b denotes a water supply valve and a drain valve for supplying and discharging the washing liquid or tin liquid in the water tank 2.

FIG. 2 shows a cross section of the variable speed mechanism assembly 8 during washing, and 11 is a motor shaft of the motor 9, which has a sun gear 12 that meshes with a planetary gear 13, and a centrifugal clutch mechanism. Clutch arm 1 to weight 14
The rotational force is transmitted through 5. A planetary gear support 16 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 built-in cam (not shown), and the clutch motor 20 has a built-in cam (not shown).
7g is reciprocated in the axial direction of the motor 9. During washing, the control plate 17d of the motor clutch 17 is in a state where the clutch motor 20 pulls out the guide pin 17h from the roller 17b.

The weight 14 of the centrifugal clutch mechanism is used when the motor shaft 11 rotates at a low speed of 600 rpm or less.
(during washing), the clutch spring 22 pulling inward does not make contact with the pulley 7. In addition, Figure 6
is a front view showing a centrifugal clutch mechanism, and in FIG. 6, 14a is a lining.

FIG. 3 is an explanatory diagram of the operation of the motor clutch during washing, in which the roller (or roller) 17b is connected to the inclined surface of the outer ring (planetary gear support 16) and the output shaft 23 by a spring integrated with the retainer 17c. It's pressed so that it's wedged between them. Note that when the outer ring (planetary gear support 16) rotates counterclockwise, the roller 17b is used, and when the outer ring (planetary gear support 16) rotates clockwise, the roller 17b'
The driving force is transmitted to the output shaft 23, respectively. With the above configuration, the rotation of the motor 9 is reduced to a predetermined speed 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, and is transmitted to the drum 3. .

FIG. 4 shows a cross section of the variable speed mechanism assembly during dewatering, and shows the control plate 17 of the motor clutch 17.
When the clutch motor 20 moves the lever 17g, the guide pin 17h moves between the roller 17b and the output shaft 23.
Because it is inserted between the planetary gear support 16
The rotation of the output shaft 23 and the rotation of the output shaft 23 become free. The clutch weight 14 has a rotation speed of the motor shaft 11 of 600 rpm.
Clutch weight 1 due to high speed rotation (during dehydration)
The centrifugal force 4 is greater than the force of the clutch spring 22 pulling inward, and the lining 14a comes into pressure contact with the pulley 7. Therefore, the rotation of the motor 9 is freed from deceleration by the planetary gear and is only decelerated by the belt, thereby transmitting the dewatering rotation operation at a predetermined speed to the drum 3.

FIG. 5 shows a cross-sectional view of the operation of the motor clutch 17 during dewatering. The clutch motor 20 is connected to the control plate 17d.
This shows a state in which the output shaft 23 rotates freely between the outer ring (planetary gear support 16) and the output shaft 23 by pushing in the guide pin 17h (via the roller push plate if inserted). In addition, the guide pin 17h of the control plate 17d in the figure is connected to the roller 1.
Although the shape allows free rotation in only one direction of 7b, it is also possible to make it free in both directions.

FIG. 7 is an exploded perspective view of the main parts of the motor clutch 17 and the planetary gear support 16, and FIG. 8 is a perspective view illustrating the case where the planetary gear support 16 is coupled 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 from rotation of the output shaft 23 by the motor clutch 17.

[0015] In the drum type washing machine having the above configuration,
Drum rotation speed during washing is 50rpm, drum load torque is 300Kg・cm, and drum rotation speed when starting spin-drying is 80r.
pm, drum load torque 150Kg・cm, drum rotation speed during dewatering 1000rpm, drum load torque 30K
It was found that driving was smoother when set to g.cm. Note that when set with this specification, the variable speed width is 20 (1
000/50). If the variable speed range used for the brushless motor is set to 4, taking into account the motor price, the gear shift will be 5.
(20/4). Also, due to the torque characteristics of the motor used, the reduction ratio of the drum rotation to the pulley rotation was set to 1/1.5.
It was set to With the above settings, the motor rotation speed is 375 rpm during washing (gear reduction 1/5, belt reduction 1/1.5) and 600 rpm (gear reduction 1
/5, belt deceleration 1 /1.5) 1500 rpm during dehydration (belt deceleration 1 /1.5)
And the motor load torque is 40Kg・cm (300 x gear reduction 1/5) during washing.
x belt reduction 1/1.5) 20Kg・cm at start of dewatering (150 x gear reduction 1/5)
x Belt reduction 1/1.5) 20Kg・cm during dehydration (30cm x Belt reduction 1/1)
．． 5).

From the above motor rotation, it can be seen that the motor rotation speed at which the centrifugal clutch operates should be set at 600 rpm or more and 1500 rpm or less. At this time, it is necessary to switch the clutch 17 using the clutch motor 20 to free the output shaft 23 from gear rotation.

FIG. 10 is an electrical circuit diagram of the main part of the embodiment shown in FIG. 1, where MC is a control circuit with a built-in microcomputer, DP is a display that displays various items, and KB is a display that displays various washing and drying conditions. Control panel for input. LS is a limit switch built into the clutch motor 20, and is switched in response to the movement of the lever 17g when the clutch motor 20 reciprocates. e is an AC power supply, and TR1 and TR2 are triacs that connect the AC power to the clutch motor 20 via a switch LS. In other words, when the triac TR1 is energized, the clutch motor 20 rotates and the guide pin 17
When the roller h is pulled out from the roller 17b and the pulling operation is completed, the limit switch LS is switched to the TR2 side, and the clutch motor 20 is stopped. Furthermore, when the triac TR2 is energized, the clutch motor 20 rotates and inserts the guide pin 17h into the roller 17b, and when the insertion operation is completed, the limit switch LS is switched to the triac TR1 side, so the clutch motor 20 rotates and inserts the guide pin 17h into the roller 17b.
stops. CT is a current transformer that detects the motor current to check whether the clutch motor 20 is disconnected, and PC is a photodetector that detects whether a normal voltage is applied to the clutch motor 20 from the AC power supply e. The coupler R is a current limiting resistor of the photocoupler PC. The control circuit MC receives outputs from the control panel CP, current transformer CT, and photocoupler PC, and outputs them to the display device DP, water supply valve 10a, drain valve 10b, motor 9, and triacs TR1 and TR2. There is.

FIG. 11 is a flowchart showing the transition operation from the washing process to the dehydration process in the embodiment shown in FIG. In FIG. 11, at the start of washing, as described above, the guide pin 17h is in the state of being pulled out from the roller 17b, so the rotary drum 3 rotates at a low speed, thereby executing the washing process (step 101). . Next, at the start of dehydration, the control circuit MC operates the triac TR2 for a short time (several meters).
s) is made conductive, and whether a normal voltage is applied from the power supply e to the clutch motor 20 from the output of the current transformer CT and the output of the photocoupler PC.
Then, it is checked whether the clutch motor 20 is disconnected (step 102). Clutch motor 2
If it is determined that a normal voltage is applied to TR2 and that there is no disconnection, the control circuit MC switches on the triac TR2.
Electrify to drive the clutch motor 20 and insert the guide pin 17h into the roller 17b (step 103)
. 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, and its rotational force is transmitted to the rotating drum 3 via the centrifugal clutch mechanism as described above, and the rotating drum 3 is rotated at a high speed to execute the dewatering process (step 104). When the dewatering process is completed, a sensor (not shown) confirms that the rotating drum 3 has stopped (switch 105), and then TR1 of the triac is made conductive for a short time (several ms), and the output of the current transformer CT and the photocoupler PC are From the output,
Check whether a normal voltage is being applied to the clutch motor 20 from the power source e and whether the clutch motor 20 is disconnected (step 106).
. When it is confirmed that the clutch motor 20 is in a state of normal operation, the control circuit MC starts the triac TR1.
Electrify to drive the clutch motor 20 and pull out the guide pin 17h from the roller 17b (step 108).
, end driving. Note that steps 102 and 106
If it is determined that the clutch motor 20 does not drive normally, the clutch motor 20 is not driven and "failure" is displayed on the display DP.

[0019] In this way, the washing/dehydration process is carried out, but in particular, at the time of transition from washing to the dehydration process,
When switching from low-speed rotation to high-speed rotation of the rotating drum 3, it is checked whether the clutch motor 20 that drives the motor clutch 7 can operate normally. Therefore, due to malfunction of the clutch motor 20, the motor 9 rotates at high speed without the motor clutch 7 operating, and the decelerated motor rotational force and the undecelerated motor rotational force are simultaneously transmitted to the belt pulley, and the motor 9 is in a locked state. Accidents such as this can be prevented.

[0020]

According to the present invention, it is possible to safely obtain the drum rotational force and rotational speed necessary for washing and dewatering using a small motor.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration explanatory diagram showing one embodiment of the present invention.

FIG. 2 is a sectional view illustrating the operation of the variable speed mechanism during washing.

FIG. 3 is an explanatory diagram of the operation of the motor clutch during washing.

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

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

FIG. 6 is a front view of the 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 the motor clutch.

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

FIG. 10 is an electric circuit diagram showing a control section of the embodiment shown in FIG. 1.

FIG. 11 is a flowchart showing a main part of the operation of the embodiment shown in FIG. 1;

[Explanation of symbols]

1 Exterior body (main body case) 3 Rotating drum 5 Drum pulley 6 Belt 7 Pulley 8 Transmission mechanism assembly (rotary power transmission means) 9
brushless motor

Claims (1)

[Claims] Claim 1: A main body case, a rotating drum that doubles as a washing tub and a dehydrating tank and is supported horizontally in the main body case, a drive motor, and a rotational power transmission that transmits the rotational power of the drive motor to the rotating drum. The rotary power transmission means includes a drive shaft of the drive motor, an output shaft coaxially provided on the outer periphery of the drive shaft so as to be relatively rotatable, a belt pulley fixed to the output shaft, and a belt pulley fixed to the output shaft. A belt suspended between the belt pulley and the rotating drum, a reduction gear mechanism that decelerates the rotational power from the drive shaft, and the reduction rotational power from this reduction gear mechanism is sent to the output shaft only during washing and drying operations. It consists of a motor clutch for transmitting data, and a centrifugal clutch that is fixed to the drive shaft and that switches and transmits the rotational power from the drive shaft to the belt pulley during dewatering operation. A drum-type washer/dryer comprising a control circuit that drives the motor clutch after detecting whether or not the motor clutch can be driven.