KR950011604B1 - Clutching confirmation method for washing machine - Google Patents

Abstract

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Description

How to check clutching of automatic washing machine

1 is an overall configuration diagram of a washing machine to which the present invention is applied.

2 is a detailed view of the clutch portion in FIG.

FIG. 3A is a structural diagram of an engagement tooth, and FIG. 3B is an explanatory diagram of an engagement operation.

4 is a block diagram of a motor drive control unit.

5 is a rotation speed graph when the motor is started.

6 is a rotation speed graph when the motor off.

FIG. 7A is an output waveform diagram of the speed detector when the pulsator and the dehydration tank rotate together, and FIG. 7B is an output waveform diagram of the speed detector when only the pulsator is rotated.

8 is a signal flow chart of a method for confirming clutching by using the time of rotation of the power during motor stop.

9 is a signal flow diagram of a method for checking clutching using a time for reaching a constant speed when driving a motor in another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: outer tank 2: washing and dehydrating tank

3: rotor 3-1: rotor tightening screw

4: motor 4-1: rotor

4-2: Stator 4-3: End Bracket

5: motor shaft 6-1, 6-2: bearing

7: sealer 8-11: teeth

12, 13 bushing 14: washer

15: Motor tightening screw 16: Air chamber

17: rib 18: outer case

19: microcomputer 20: inverter

21: speed detector

The present invention relates to a technology for smoothing the clutching action of the automatic washing machine, in particular, by using buoyancy during water supply to ensure that the clutch is smoothly performed when the combined use dehydration tank rises and to make sure that the engagement teeth are engaged. The present invention relates to a clutch checking method of a fully automatic washing machine.

In the general automatic washing machine, even if the clutching state is not correct in the washing or rinsing mode and the dehydration mode, there is a problem in that the teeth are easily worn and the reliability of the operation cannot be guaranteed because it is not equipped with a function for correcting and correcting them. .

The present invention is to check the clutching using the difference in the speed change due to the inertial force in order to solve such a problem, and to check the presence of the clutching by using the rotation time of the force due to the inertial force to make the clutch smoothly performed One, it will be described in detail by the accompanying drawings.

1 is an overall configuration diagram of a washing machine to which the clutch checking method of the present invention is applied, and as shown therein, the outer tub 1 is suspended and supported inside the washing machine main body 18, and a variable speed in the center of the outer tub 1 is shown. The possible motor 4 is fixed, and the rotor 4-1 exists inside the motor 4, and the motor shaft 5 inserted in the rotor 4-1 is the rotor 4-1. It is supported by the upper and lower bearings 6-1 and 6-2, and the upper bearing 6-2 is supported by the end bracket 4-3 of the motor 4, and this end bracket 4 -3) is fixed to the lower center of the outer tub 1, and has the structure which fixes the motor 4 to the lower center of the outer tub 1, and supports the motor shaft 5. As shown in FIG.

The rotor 3 is mounted on the upper portion of the motor shaft 5, and the washing / dehydrating tank 2 is disposed between the lower portion of the rotor 3 and the outer tub 1 in the outer tub 1. The sliding bearings 6-1 and 6-2 are inserted or pressed in the center of the lower portion of the washing / dehydrating tank 2 so as to be moved up and down along the rotational support, and the rotor 3 is circumferentially supported. The interlocking tooth 1 (9) having a tooth shape is fixed, and the interlocking tooth 2 (8) paired with the interlocking tooth 1 (9) is fixed to the upper center of the lower center of the washing / dehydrating tank (2), and the outer tank (1). An engagement tooth 4 (11) having teeth in the circumferential direction is fixed at the center of the inside, and an engagement tooth 3 (10) paired with the engagement tooth 4 (11) is fixed to the lower center lower part of the washing / use dehydrating tank (2) Meshing pairs that are paired with each other are fixed to the upper and lower ends of the central lower part of the washing / drying dehydration tank (2), and the shape of the interlocking teeth As shown in Fig. 3a, the teeth having a plurality of teeth around the circumference are attached up and down at the center bottom of the washing / dehydrating tank 2, and the engaging teeth having a plurality of teeth on the inner circumference are provided. It is attached to the lower part of the rotor 3 and the outer tank 1.

The lower part of the combined use dehydration tank (2) has a structure in which the rib 17 is radially configured to have an air chamber (16) so that the air is filled with water when washing, the air chamber (16) It forms a plurality of holes that can be drained when draining water in a part of the) to be drained through the dehydration hole of the dehydration tank (2) of the combined use dehydration tank (2).

The sealer 7 is fixed to the center of the upper end bracket 4-3 of the motor 4, and the sealer 7 is assembled to the bottom of the outer tub 1 of the end bracket 4-3 to which the sealer 7 is fixed. The sealer 7 is in close contact with the groove in the lower central portion of the outer tank 1 to prevent water leakage.

And, looking at the peripheral portion of the microcomputer 19 for driving the motor 4, as shown in Figure 4, the speed detector for detecting the speed of the inverter 20 and the motor 4 for driving the motor 4 ( 21).

When described in detail with reference to Figures 2 and 3, 5 to 9 attached to the operation and effects of the present invention configured as described above.

In the operation of the present invention, as in the conventional operation, the outer tub 1 is supported by the support rod by hanging on the main body of the washing machine, and the washing / drying dehydration tank 2 therein is stopped and left and right of the rotor 3. The washing mode for washing the laundry by stirring and the dehydration mode in which the combined-use dehydration tank (2) and the rotor (3) rotate at the same speed are divided into the washing and dehydration modes.

In the initial mode of the washing machine, however, the washing / dehydrating tank (2) is lowered in the same state as the left dehydrating mode of FIG. 1, so that the engagement teeth (2) and the washing / dehydrating tank (2) of the lower part of the rotor (3) are lowered. Interlocking teeth 1 (8) are connected to each other, the interlocking teeth 4 (11) fixed to the outer tank (1) at the bottom and the interlocking teeth 3 (10) fixed to the washable dehydration tank (2) are separated from each other When the motor 4 rotates, the dehydration mode is performed.

First, when the washing mode is described, water is supplied in the initial state of the washing machine. Since the initial state is the dehydration mode, the rotor 3 and the combined washing / dehydrating tank 2 rotate together, and when water is supplied to a certain degree, Air is filled in the air chamber 16 under the dehydration tank 2, and buoyancy acts on the volume of the combined washing dehydration tank 2 as much as water is filled.

F = ρgV (F: Buoyancy, ρ: Density of water, V: Volume of washing and dehydrating tank 2 submerged in water [including air chamber], g: Gravity acceleration)

When the size of the buoyancy acting here becomes larger than the magnitude of gravity acting on the washing dewatering tank 2, the washing dewatering tank 2 is a sliding bearing 6-1, 6 supported on the motor shaft 5; Sliding through the -2) to rise, and the engaging teeth 2 (9), the engaging teeth 3 (10) fixed to the upper and lower ends of the combined wash dehydration tank (2) is also injured together.

At this time, the teeth of the combined washing dehydration tank 2 and the rotor 3 become like the washing mode of b through FIG. 3a.

That is, the interlocking teeth 1 (8) of the lower part of the rotor (3) and the interlocking teeth 2 (9) fixed to the washing and dehydrating tank (2) are separated from each other and the interlocking teeth 3 (10) fixed to the outer tank (1) of the lower part. And the teeth 4 (11) fixed to the dehydration tank (2) are interlocked with each other so that the combined use dehydration tank (2) is fixed to the outer tub (1) so that only the rotor (3) rotates.

However, in this series of clutching process, when the dehydration tank 2 starts to float due to buoyancy, separation of the engaging teeth 1 (8) and the engaging teeth 2 (9) can be performed smoothly, but the engaging teeth 3 (10) and The engagement (or clutching) of the teeth 4 (11) is not always in a position where the gear-type engagement teeth and grooves can be engaged, so when the water level reaches a certain level after the start of water supply, the motor 4 is intermittently stirred left and right. When the dehydration tank (2) is injured, the gear-type engagement teeth 3, 4 (10), so as to find the position of the projection and groove of the (11) to smoothly perform the clutching.

Subsequently, when the water level reaches the predetermined level while simultaneously driving the motor 4 together with the water supply, the washing process should proceed. If the clutch is not carried out by the disturbance and proceeds straight to the washing mode, the dehydration tank 2 ) Rotates with the motor 4 to perform washing in a state in which washing is impossible, and in this case, the engagement teeth 1, 2 (8) and (9) are separated from each other and the teeth 3, 4 (10) and (11) Check if they are coupled to each other, and if it is not normal, the water level should be raised so that buoyancy can be generated sufficiently so that the engagement teeth are in the normal clutching state.

Therefore, when the water level reaches a certain level, a clutching process is required.

Hereinafter, the clutching confirmation process will be described in detail.

First, as shown in FIG. 4, when the voltage command is kept constant and the rotation speed of the motor 4 is sensed while the motor 4 is driven, the rotation speed change curve as shown in FIG. 5 can be seen. have.

The curve in Fig. 5 is the speed change curve when only the pulsator rotates, and the speed increases rapidly because the inertia force of the pulsator is very small. (The mechanical time constant is small.)

However, in the curve (2), when the dehydrating tank (2) having a very high inertia force and the pulsator are engaged, the speed rise is very slow at the same voltage command (mechanical time constant is large).

Therefore, since the time t1 and t2 reaching a constant speed ωo show a very large difference, the presence or absence of clutching can be confirmed by the difference in speed due to the inertia force when the motor 4 is started.

Another engagement clutch check method using the inertial force of the pulsator and the dehydrating tank (2) is to rotate only the pulsator due to the difference in inertia force when the motor 4 is rotated at a constant speed ω o and then turned off, as shown in FIG. In the case of ① curve, the rotation time of the force is very short. On the contrary, when the dehydrating tank (2) and the pulsator are engaged at the same time, the rotation time of the inertia force becomes very long and the time until the stop time becomes longer. You can judge.

Then, when clutching is confirmed, after water supply to a certain level, when the motor 4 is in reverse rotation, the rotor 5 fastened to the upper portion of the motor shaft 5 is stirred while washing.

At this time, according to the rotation of the rotor (3), due to the inertia of the water and the laundry, the force for the washing combined dehydration tank (2) is generated, the engagement teeth fixed to the lower portion of the outer tub (1) combined washing dehydration tank ( 2) meshes with the interlocking tooth mounted on the tooth to correct the rotation of the combined use dehydration tank (2).

In other words, it serves to hold the rotation of the rotor (3) by the inertial force in the opposite direction of rotation to perform the function of preventing the reverse rotation.

When the washing stroke proceeds and becomes a dehydration stroke, the drain valve in the lower part of the outer tank 1 is opened by the solenoid or the drain motor 4, and the water in the outer tank 1 comes out.

If a certain amount of water is drained, the opposite phenomenon occurs when the washing combined dehydration tank 2 is washed.

That is, as the water decreases, the submerged parts of the combined use dehydration tank (2) are reduced together, so that the buoyancy gradually decreases accordingly, and thus becomes smaller than the size of gravity, thereby causing the combined use of the washing dehydration tank (2). Slides along the motor shaft 5 through the sliding bearings 6-1 and 6-2 and descends.

Engaging teeth 2, 3 (9), and (10) attached to the upper and lower ends of the combined washing and dehydrating tank (2) are also lowered, and the engaging teeth fixed to the lower part of the rotor (3) as shown in the dehydration mode of FIG. 2 (9) is meshed with each other, the engaging teeth 4 (11) attached to the lower outer tank (1) and the engaging teeth 3 (10) of the bottom of the dehydration tank (2) are separated from each other.

Therefore, the rotor 3 and the combined washing and dehydrating tank 2 transmit the rotational torque to each other through the engagement teeth, and dehydration is performed while rotating at a high speed in one direction.

In this case, the engagement teeth may not be coupled to each other at the correct position. Therefore, the motor 4 should be briefly rotated left and right to align with each other. If the clutch to be engaged by left and right stirring is a short distance, but the cast iron (2) is free fall can act as a large impact.

Accordingly, the alignment of the engagement teeth during drainage causes the motor 4 to be briefly rotated to the left and right in a state in which water is not completely drained and is somewhat remaining, so that the impact is alleviated by the water.

As described in detail above, the present invention smoothly performs clutching by allowing the motor to be intermittently stirred from side to side when the water level reaches a certain level after the start of water supply so as to locate the projections and grooves of the gear-type engaging teeth when the dehydration tank is injured. There is an effect that can be made, and the alignment of the engagement teeth during drainage has the effect of reducing the impact by the water by rotating the motor shortly to the left and right in a state that the water is not completely drained and remaining to some extent.

Claims (2)

After water supply to the reference level, the motor 4 is driven at the reference speed, and then the driving stop time is checked while comparing the reference time with the power off of the motor 4, and as a result, only the pulsator is lower than the reference time. It is determined that the normal clutching is driven, and after the first step of proceeding with washing and draining to the reference level, the motor driving process from the first step to the comparison of the reference time is performed, and when the pulsator and the washing tank are over the reference time, Determination of the clutching of the fully automatic washing machine, characterized in that the second step of proceeding with the dehydration process determined by the normal clutching driven at the same time. After supplying water to the standard water level, the motor 4 is driven to the reference speed to check the time required, and the checked time is compared with the reference time to determine the normal clutching state in which only the pulsator is driven when the time is less than the reference time. After the eleventh step and the drainage to the reference water level, the motor driving process from the eleventh step to the reference time comparison process are performed, and when the reference time is longer than the standard time, the pulsator and the washing tank are driven at the same time and dehydrated. Clutching confirmation method of a full automatic washing machine comprising the twelfth step of proceeding the process.