KR940006382Y1 - Safety arrangement of washer - Google Patents

Abstract

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Description

Dehydration Safety Device of Washing Machine

1 is a block diagram of a conventional pulsator washing machine.

2 is a block diagram of a conventional drum washing machine.

3 is a view illustrating the internal configuration of a door switch of a conventional drum washing machine.

4 and 5 are views showing the configuration of a washing machine according to the present invention.

4 is a full sectional view.

5 is a cross-sectional view of the drum motor.

6 is a flow chart.

* Explanation of symbols for main parts of the drawings

1: external door 9: drum

36: commutator coil 37: induction coil

38: rotor

The present invention relates to a dehydration safety device that suddenly stops a drum rotating at high speed when the door is opened during dehydration of the washing machine, and more particularly, to a dehydration safety device suitable for a combined washing type washing machine that performs both a drum washing and a pulsator washing.

In the conventional pulsator washing machine, as shown in FIG. 1, the outer tub 52 is fixed to the inside of the washing machine main body 51, and the inner tub 53 is installed inside the outer tub 52. 53, the washing tank 54 is installed inside, the lower portion of the outer tub 52, the motor 55 and the clutch 57 is installed, the washing shaft 58 and the dewatering shaft protruding to the upper portion of the clutch 57 59 are coupled to the washing tank 54 and the inner tube 53, respectively. In addition, the door switch 60 is installed to interlock with the door 56, and the outlet 52 is suspended from several dampers 61.

The conventional pulsator washing machine receives the driving force of the motor 55 during dehydration through the clutch 57 and the washing tank 54 and the inner tub 53 rotate at a high speed, and when the door 56 is opened, the door switch ( 60 is operated to operate the brake for the clutch 57 so that the washing tank 54 and the inner tub 53 are stopped rapidly and the power to the motor 55 is cut off.

3 is a front view of a conventional drum washing machine. As shown in the drawing, a door 72 is mounted on the outside of the outer case 71 and a door switch 73 is disposed on the inside of the outer case 71. It is installed adjacent to. As shown in FIG. 3, the door switch 73 has a movable contact plate 76 attached to the pressure terminal 75, and contacts the pressure terminal 75 and the movable contact plate 76 to form a bimetal 77. And a heater 78 are provided so that the bimetal 77 and the movable contact plate 76 interlock with each other, and the clasp 79 movable up and down is fixed to the movable contact plate 76. A slide plate 81 is provided on the upper side of the switch housing 80, and a locking hole 82 through which the latch 79 is inserted is formed in the slide plate 81, and the door latch 83 is located outside thereof. .

In the conventional drum washing machine, when the door 72 is closed, the door latch 83 moves downward in FIG. 3 so that the slide plate 81 moves in the direction of the arrow, and the door latch 83 is caught by the slide plate 81. do. When the power switch 85 is turned on in this state, electricity is applied through the input terminal 75, and heat is generated in the heater 78 between the input terminal 75 and the heater terminal 86 to deform the bimetal 77. By this deformation, the movable contact plate 76 moves the latch 74 to connect the movable contact 87 and the output contact 84, and the latch 79 is connected to the engaging hole 82 of the slide plate 81. The door 72 cannot be opened by being inserted and fixing the slide plate 81. After washing in such a state, when the power switch 85 is turned off, the power applied to the heater 78 is cut off, the bimetal 77 cools down, and the movable contact plate 76 returns to its original state by elasticity, and the latch is accordingly. The 74 may be removed from the locking hole 82 of the slide plate 81 to move the door latch 83 so that the door 72 may be opened.

However, the pulsator type washing machine of the two washing machines described above is braked from the clutch to the brake when the dehydration safety device opens the door, so a separate clutch braking brake is required, which is a cause of failure and a price increase. The safety device is inconvenient because the customer has to wait two or three minutes to turn off the power and open the door, and there is a defect that causes electric loss by using a heater.

The present invention was devised to solve the above-mentioned defects. In the combined washing machine for drum washing and pulsator washing, when the external door is opened while the washing machine is dewatered, the electronic brake is applied to the drum motor to decelerate and stop. The present invention will be described in detail by the accompanying drawings to Figure 6 as follows.

4 is a cross-sectional view of the washing machine according to the present invention, as shown therein, the tub 8 is supported by several dampers 18 inside the main body case 30 and fixed to the base plate 19, and the tub 8 The rotatable drum 9 is fixed to the spider 25 and the drum shaft 28 is supported on the bearing 29 of the bearing housing 23. The pulsator 26 is installed inside the drum 9, the pulsator shaft 27 is assembled into the drum shaft 28, and the pulsator pulley 17 fixed to the lower end is the pulsator motor 24 and the belt 22. ) Is connected. The drum shaft 28 has a drum pulley 16 fixed to the lower end thereof, and is connected to the drum motor 14 and the belt 15. The drum motor 14 and the pulsator motor 24 are disposed on the outer surface of the tub 8. Attached. An auto balancer 7 is attached to the top of the drum 9, and a tub cover 41 is attached to the top of the tub 8, and the tub door 2 is coupled thereto. The door hook 3 is coupled to the tub door 2 to be caught and closed by the door switch 40, and the door 2 is configured to be pulled open by the handle 4.

The controller 42 is attached to the upper part of the main body case 30, the outer door 1 is attached, and the door switch 5 is turned off when the outer door 1 is opened. Also, the tub 8 may be erected upright as shown on the tub shafts 13 at both sides of the circumferential wall, or may be laid horizontally by rotating 90 ° left, and a worm gear motor fixed to the tub 8 It is rotated by the power of 10). A worm 11 engaged with the worm wheel 12 is fixed to the shaft end of the worm gear motor 10, and micro switches 43 and 44 are fixed to both ends of the worm wheel 12, respectively.

In FIG. 4, reference numeral 6 denotes a water inlet, 20 denotes a pump, and 21 denotes a drain hose.

5 is a cross-sectional view showing the configuration of the drum motor, as shown in the figure, the motor shaft 32 and the rotor 38 are supported by the bearing 39 and rotatably installed in the motor casing. The commutator coil 36 and the induction coil 37 are fixed around it, and the commutator 34 and the brush 35 for commutator motors are provided. The motor pulley 31 is fixed to the end of the motor shaft 32.

The drum motor 14 applies power to the induction coil 37 at the time of washing, rotates at a low speed at 1500 to 1600 rpm with a four-pole induction motor, and rectifies the power to the coil 36 at the time of dehydration. And the rectifier 34 rotate at high speed at 12000 to 13000 rpm.

In addition, when the external door (1) is opened during dehydration, power is applied to the induction coil (37) which cuts off the power and rotates at low speed for several seconds to reduce the speed of the drum. have.

6 is a flow chart illustrating the operation of the combined washing machine according to the present invention. Hereinafter, the effects of FIG. 4 to FIG. 6 will be described.

When opening the outer door (1) first, the door switch (5) is turned off and is not in operation. The door is paused. Pulling the tub door (2) with the handle (4) removes the door hook (3) from the door switch (40). Is opened.

After opening the outer door 1 and the tub door 2, the laundry is placed in the drum 9, the tub door 2 and the outer door 1 are closed, and operated by the controller 42. If the selected program is drum washing (heat washing), the tub (8) is operated by the gear motor (10) and rotates 90 ° left, and by connecting the micro switch 44 attached to the left side of the worm wheel (12) Will stop.

In this state, the washing and rinsing proceeds, and when the washing and rinsing is finished, the tub 2 is reversed again and turned upright and stopped by connecting the micro switch 43. Thus, the tub 2 is dehydrated while standing upright. .

When washing the drum, the drum motor 14 rotates, the drum pulley 16, the drum shaft 28 and the spider 25 are rotated, and the drum 9 continues to rotate while being washed, and the drum motor 14 when dewatered. Is rotated at high speed.

However, if the program is selected for pulsator washing, the pulsator motor 24 is operated with the tub 2 straight, the pulsator pulley 7 and the pulsator shaft 27 rotate and the pulsator 26 is rotated. It is linked and washed while rotating left and right. And during dehydration after washing and rinsing, the drum motor 14 is rotated at high speed to be dehydrated.

When the external door 1 is opened and the tub door 2 is opened during the dehydration during the washing and dehydration process as described above, the drum 9 continues for a few minutes due to inertia even when the drum motor 14 is turned off. High speed turns into a dangerous state. The present invention is to prevent this by using a motor capable of two speeds, such as the drum motor 14 of FIG. 5, the door switch (5) is turned off at the moment of opening the external door (1) when dehydration Is transmitted to the microcomputer controller 42, the power supply to the commutator coil 36 of the drum motor 14 is immediately cut off by the control of the microcomputer controller 42, and the power supply to the induction coil 37 is several seconds (2 to 3 seconds). When the drum 9 rotates at a high speed, the drum 9 continues to be driven by inertia, but a strong electromagnetic brake is applied by the induction coil 37 to rapidly rotate at a low speed of the induction motor. At this time, since the speed of the motor pulley 31 and the drum pulley 16 is reduced, the drum 9 rotates at a low speed of 50 to 55 rpm. When the power of the induction coil 37 of the drum motor 14 is also cut off, the drum 9 It's safe to stop soon.

The present invention, such as drum washing (heat washing) and pulsator washing in the combined washing machine to open the external door during dehydration when the power is applied to the induction coil for several seconds while the power is cut off the commutator coil to rotate at high speed for dehydration It is designed to reduce the speed, and it can safely brake the drum because there is no separate mechanical clutch or brake, so it can reduce cost and trouble, and do not have to wait for a long time until the drum stops, saving electricity consumption. Is a must.

Claims (1)

When the motor 38 installed inside the motor casing, the commutator coil 36 for rotating at high speed when dewatering, the induction coil 37 for rotating at low speed during washing, and the outer door 1 at the time of dehydration, the commutation is performed. Dehydration safety device for a washing machine, characterized in that it comprises a control means for reducing the power of the drum (9) by forming a magnetic brake by turning off the power to 36 and applying power to the induction coil (37).