JPS6310153Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) The present invention is equipped with a pulsator having a substantially truncated conical shape with blades on the outer circumferential surface, and by driving this pulsator at a low speed and reversing left and right at a cycle of several seconds, it is possible to The present invention relates to a washing machine that suppresses entanglement rate and variation in cleaning to a small level and exhibits sufficient cleaning performance.

(Prior art) Recently, compared to a whirlpool washing machine equipped with a disk-shaped pulsator, by rotating a substantially truncated cone-shaped pulsator left and right in a short cycle of several seconds,
A washing machine has been proposed that can reduce the tangling rate of laundry and the variation in washing, and can also exhibit sufficient cleaning performance with less damage to the fabric.

In such a washing machine, it is desirable to set the rotational speed of the pulsator to a low speed of 250 rpm or less, and the pulsator is configured to be rotated exclusively by a motor at a low speed via a two-stage reduction mechanism. ing.

On the other hand, the rotation speed of the motor changes depending on the power supply frequency, and when the shape of the pulsator and the reduction ratio of the two-stage reduction mechanism are kept constant, when using 50Hz, the rotation of the pulsator will cause more washing than when using 60Hz. The movement of objects was slow and the cleaning performance inevitably deteriorated. Therefore, in the past, it was possible to obtain the same cleaning performance when using 50Hz as when using 60Hz by changing the shape of the pulsator or changing the reduction ratio of the reduction mechanism.
In the former case, it is necessary to prepare two types of pulsators, which leads to a significant increase in costs due to mold costs, etc.
In the latter case, many parts such as pulleys and belts had to be prepared in two types, and could not be called good in terms of parts management and serviceability.

(Purpose of this proposal) However, this proposal sets the reversal time of the reversing switch that controls the drive motor to 1.2 times when using 50Hz as when using 60Hz, so that the reduction ratio of the pulsator and reduction mechanism can be shared between 50Hz and 60Hz. Tonashi,
This was designed to eliminate the drawbacks of the previous model.

(Example) An example of the present invention shown in the drawings will be described in detail below.

First, in FIGS. 1 to 4, a washing tub 1 is formed in a rectangular or square shape, and has a recess 2 at the center of its inner bottom surface. A bearing holder 3 inside the bearing assembly is attached to the center of the recess 2 of the washing tub 1, and a pulsator shaft 4 is rotatably inserted and supported in the holder 3. Thus, the pulsator shaft 4 is supported within a range of 90±5 degrees with respect to the horizontal plane, thereby suppressing inclination of the pulsator, which will be described later. The pulsator 5 is positioned above the recess 2 of the washing tub 1 by being attached to the upper end of the pulsator shaft 4. This pulsator 5 has a substantially truncated conical shape as shown in FIG _. The height is set gradually higher from the lower end to the upper end so that the height dimension _h1 of the lower end is larger than that of the lower end. And this 2
The blades 6, 6 are spaced apart from each other by 180°. Further, a pulley 7 is attached to the lower end of the pulsator shaft 4, and by linking the pulley 7 to a drive motor 8 via a two-stage reduction mechanism, the pulsator 5 is driven by the motor 8 in a left-right reversal.
Note that the rotational speed of the pulsator 5 is desirably set to a low speed of 250 rpm or less.

The drive motor 8 is elastically supported on a washing machine bottom 9 made of synthetic resin via a vibration-proof rubber 10, and a four-pole motor is used as the motor 8. The two-stage reduction mechanism is composed of a pulley 7, a pulley 11 with a fan attached to the shaft of the motor 8, intermediate pulleys 12, 13, belts 14, 15, etc., and both intermediate pulleys 1
2 and 13 are attached to the same hollow shaft 16, and rotatably supported by the intermediate shaft 17 through the shaft 16. This intermediate shaft 17 is erected and fixed to a tank reinforcing plate 18 with nuts 19, and the tub reinforcing plate 18 is attached to the outer bottom surface of the washing tub 1 to reinforce the bottom of the tub 1.
Thus, belts 14 and 15 are stretched between the pulley 7 and the intermediate pulley 12, and between the fan pulley 11 and the intermediate pulley 13, respectively, thereby constructing a two-stage reduction mechanism. The reduction ratio of this two-stage reduction mechanism is, for example, when the rotation speed of the pulsator 5 is 60Hz.
It is set to 180rpm and 150rpm at 50Hz.

In addition, in the figure, 20 is the outer tub of the washing machine, 21 is the panel part,
22 is a washing timer, 23 is a dehydration timer, 24
indicates a drainage hose.

Next, in FIG. 6, the driving motor 8 of the pulsator 5 is driven by a washing timer 22 to reverse the left and right directions at intervals of several seconds. The timer motor TM is connected in parallel to the series circuit consisting of the reversing switch RS and the motor 8. Therefore, such a washing timer 22 is prepared for 60 Hz and 50 Hz, and is selected and installed according to the power frequency.
The reversal times of the reversing switches R and S are made different. For example, the reversing switch RS of a 60Hz timer
, A contact ON for 1.5 seconds, neutral (pause) for 0.5 seconds, B contact
It reverses at a cycle of 1.5 seconds ON and 0.5 seconds neutral (pause), and in contrast, the 50Hz timer's reversal switch
RS is 1.8 seconds ON, 0.6 seconds neutral, 1.8 seconds ON, 0.6 seconds neutral, and the time is 1.2 times longer. By varying the reversal time of the reversing switch RS in this way, the pulsator 5 rotates 4.5 times each time the motor 8 is operated, regardless of whether the frequency is 60Hz or 50Hz.
The same movement can be applied to the laundry, and there is almost no difference in cleaning performance when using 60Hz and 50Hz.

(Operation of the Embodiment) In the above configuration, when the washing timer 22 is set to a desired washing time and the washing operation is started, the reversing switch RS is switched at a predetermined cycle to drive the motor 8 in reverse from left to right. As a result, the pulsator 5 repeats horizontal reversal at a frequency of 50 Hz or 60 Hz, and the washing operation is effectively performed as described below.

Now, for example, when the pulsator 5 rotates clockwise and stops, the laundry continues to rotate clockwise due to inertia along with the water.
While this rotation continues, the pulsator 5 pauses and starts rotating to the left, so the blades 6, 6 of the pulsator 5 rotating to the left collide with the laundry rotating to the right to reverse the laundry. This is where the high massaging effect is demonstrated. Moreover, since the pulsator 5 has two blades 6, 6 spaced apart from each other by 180 degrees, the collision area between the laundry and each blade 6, 6 is increased compared to the case where many blades are spaced apart from each other. This will further promote the above-mentioned massaging effect.

In addition, in the case where the pulsator 5 is driven to rotate horizontally in a short period of several seconds, if the washing tub 1 is simply made circular, the water flow and the movement of the laundry obtained are extremely simple, and the degree of cleaning is low, but the actual If the washing tub 1 is made rectangular or square as in the embodiment, a complicated water flow will be obtained due to the action of each corner, and the movement of the laundry will also be complicated. Therefore, although the water flow obtained is a weak water flow by horizontally reversing the pulsator 5 in a short period, an extremely high degree of cleaning can be obtained due to the interaction between the complex movement of the laundry and the above-mentioned massaging effect. Of course, there is less damage to the fabric.

Furthermore, each blade 6, 6 of the pulsator 5 is set so that the height _h2 of the upper end is larger than the height _h1 of the lower end so that the upper part acts more strongly on the laundry than the lower part, so that the laundry is twisted. In combination with the horizontal reversal drive in a short cycle, the rate of entanglement of laundry can be significantly reduced, and variations in the degree of washing can be suppressed to a small level. In other words, when the height of the blades 6 of the pulsator 5 in the shape of a truncated cone is made constant vertically, the pulsator 5 acts on itself and the laundry in the lower part where the distance to the side wall of the washing tub 1 is small and it approaches the bottom wall. This problem can be solved by changing the height of the blade 6 in this embodiment. are doing.

For the above reasons, the washing operation can be performed with less variation in the tangling rate and cleaning degree of the laundry, with high cleaning degree and less damage to the fabric. Moreover, such an effective washing operation can be obtained in the same way whether the washing machine is used at 50 Hz or 60 Hz, by changing the reversal time.

(Effect of the present proposal) According to the structure of the present proposal, the reversing time of the reversing switch when using 50 Hz is the same as when using 60 Hz.
By setting it to 1.2 times, 50Hz, 60Hz can be achieved without changing the shape of the pulsator or the reduction ratio of the reduction mechanism.
Similar cleaning performance can be expected for both Hz and the previous drawbacks can be overcome.

[Brief explanation of the drawing]

Fig. 1 is an external view showing the washing machine of the present invention, Fig. 2 is a plan view showing the main parts of the same, Fig. 3 is a schematic cross-sectional configuration diagram taken along line A-A in Fig. 2, and Fig. 4 is B in Fig. 3. -B sectional view, Figure 5 is a perspective view showing the same pulsator, Figure 6 is a perspective view showing the same pulsator.
The figure is an electrical circuit diagram of the same as above. 1: Washing tub, 5: Pulsator, 6: Blade, 7:
Pulley, 8: Drive motor, 9: Washing machine bottom stand, 1
1: Pulley with fan, 12/13: Intermediate pulley,
14/15: Belt, 17: Intermediate shaft.

Claims (1)

[Scope of utility model registration request] A pulsator in the shape of a substantially truncated cone with blades on the outer circumferential surface is provided at the inner bottom of the washing tub, and this pulsator is rotated at low speed by a drive motor via a deceleration mechanism, and the drive motor is rotated for several seconds by a reversing switch. In devices that drive left and right inverted periodically,
A washing machine characterized in that the reversing cycle of the reversing switch is set to 1.2 times when using 50 Hz than when using 60 Hz.