JPS6141236B2 - - Google Patents

Description

[Detailed description of the invention] The present invention performs washing, rinsing, and dehydration in the same tank, and in the rinsing process in particular, the inner tank is driven intermittently with less water than the rated water amount stored in the inner tank. The present invention relates to a washing machine with a dehydrating function, and more specifically, it is capable of obtaining two different water levels, one during the washing process and the other during the rinsing process, by operating the same pressure switch.

Conventionally, in dehydrating and washing machines that operate the inner tub intermittently by setting the water level to a level lower than the rated water volume during the rinsing process, this pressure switch detects the rated water volume during the washing process and the water volume during the rinsing process. There are some cases where separate devices are provided for each type.

However, in this case, it is necessary to provide two pressure switches, which has the disadvantage of increasing costs.

The present invention solves the above-mentioned conventional drawbacks, and one embodiment thereof will be described below with reference to the accompanying drawings.

In Fig. 1, 1 is the housing of the washing machine, 2 is an inner tub in which washing, rinsing, and dewatering are carried out, with the peripheral wall excluding at least the upper end being a non-porous wall, and a balance ring 3 in the upper opening. However, a flange 4 is also fixed to the bottom. One end of a dewatering shaft 5 is fixed to the flange 4, and a plurality of water passage holes 6 are provided.

Reference numeral 7 denotes a water reservoir case configured watertightly through oil seals 8 and 9 with respect to the flange 4 and dewatering shaft 5, and a water passage hole 10 is bored in a part of the bottom of the case. The hole 10 communicates with a pressure switch 12 via a water pipe 11.

Reference numeral 13 denotes a ring body made of a flexible material, such as a rubber material, and one end of which is connected to the water reservoir case 7.
In addition, the other end is fixed to the outer tank 14 in a watertight manner. A rotating blade 15 is provided at the center of the inner bottom of the inner tub 2, and is fixed to one end of the washing shaft 16.

The washing shaft 16 and the dewatering shaft 5 are arranged coaxially, and are connected to a pulley 18 via a washing and dehydrating switching clutch (not shown) built in a bearing box 17. The rotation of the motor 19 is transmitted to the washing shaft 16 or the dewatering shaft 5 via the motor pulley 20, the V-belt 21, and the pulley 18.

Reference numeral 22 denotes a vibration isolator that connects the outer tank 14, which rotatably houses the inner tank 2, and vibration systems such as the motor 19 to the housing 1.
It is held suspended from the top four corners. 23 is a drain port provided at the bottom of the outer tank 14, and 24 is a drain port provided at the bottom of the housing, which communicates with the drain port 23.

FIG. 2 shows a schematic configuration of the pressure switch 12, in which 25 is a first pressure switch case, 26 is a second pressure switch case, 27 is a flexible material,
For example, a bellows molded from rubber or the like is shown, and an airtight structure is formed between the bellows 27 and the first pressure switch case 25. Bellows 2 via water pipe 11
7, and depending on the magnitude of this pressure, the bellows 27
displacement occurs.

28 is a resin fixture fixed to the bellows 27, and according to the vertical movement of this fixture 28,
Contact point 29 is displaced.

30 is a pressure setting spring; 31 is a spring pressure setting device; 32 is a positioning fitting for setting the position of the spring pressure setting device 31; 33 is a return spring for restoring the spring pressure setting device 31 to its original position; 34 indicates a magnet for displacing the positioning metal fitting 32.

Reference numerals 35 and 36 indicate contacts, and contact 29 and these contacts 35 and 36 require quick-break and quick-on contact switching due to the inrush current of the motor 19, and generally have a structure with a toggle mechanism. are doing. Note that a detailed explanation of this mechanism will be omitted.

In the above configuration, when setting the rated water amount during the washing process, the magnet 34 is not energized, and therefore the spring pressure setting device 31 is located at point A in FIG. At this time, the pressure setting spring 30 has a total spring length of
The contact 29 switches from the contact 35 to _the contact _{36 only when a water pressure P A sufficient} to overcome the spring pressure K _A is generated.

Next, when moving to the rinsing process, magnet 3
4 is energized, the positioning metal fitting 32 is displaced, and accordingly, the spring pressure setting device 31 is located at point B in the figure. At this time, the total spring length of the pressure setting spring 30 is l _B , and the corresponding spring pressure K _B is indicated. Since the total length of the spring is l _A < l _B , the spring pressure is K _A > K _B. Therefore, during the rinsing process, the pressure P _B is smaller than the pressure P _A during the washing process. , the contact 29 switches. That is, the amount of water in the inner tank 2 during the rinsing process is
Although it is less than the rated water amount, the pressure switch 12 is activated by this amount of water.

3 and 4 show electrical circuit diagrams and timer programs. In FIG. 3, 37 is a water supply valve, 38 is a timer drive motor, 39 is a braking magnet, and 40 is a capacitor for starting and operating the motor 19. _T1 ... _T8 are contacts of the time switch, which are opened and closed by a cam (not shown) operated by the timer drive motor 30.

FIG. 4 shows the operations of the time switch contacts T _{1 .} . . T ₈ during a series of processes such as washing, rinsing, and dehydration.

According to the above configuration, when water is supplied during the washing process, the contact _T1 is in the on state, and the pressure switch 1 is turned on.
Since the contact point T2 is on the NC side (contact 35 side in Figure 2) and the contact point _T3 for the water supply valve 37 is on the a side, the water supply valve 37 operates and water is supplied into the inner tank 2.
When the rated water volume is reached, the contacts of the pressure switch 12 are
Switches to the NO side (contact 36 side in Figure 2). As a result, the timer drive motor 38 is activated, and at the same time, the washing/rinsing (spin-drying) switching contact T ₄
is on the a side, and the motor 19 rotates in forward and reverse directions by switching the contact T ₆ for a short time to reverse the motor 19. At this time, the movement of the motor 19 is transmitted to the rotary blade 19 via the washing shaft 20 by the action of a washing/dehydration switching clutch built in the bearing box 17.

Next, when moving to the drain/dewatering process, contact T ₃
is on the b side, contact _T4 is also on the b side, and at the same time, the working contact _T5 of the braking magnet 39 is turned on, the brake mechanism (not shown) that was fixing the inner tank 2 is released, and the inner tank 2 is rotatable.

On the other hand, contact T ₇ is on the b side, so motor 1
9 rotates at high speed in only one direction, and the movement of this motor 19 is transmitted to the inner tank 2 via the spindle shaft by the action of the washing/spindle switching clutch, and the water impregnated in the clothes is absorbed by the centrifugal force. dehydrated by
Water is drained from the upper opening of the inner tank 2.

Next, the case where the process moves to the rinsing process will be explained. When water is supplied during the rinsing process, the pressure switch 12
The contact _T2 which operates the magnet 34 to change the water pressure is turned on. Therefore, as explained above, the pressure setting spring 30 of the pressure switch 12
The spring pressure is smaller, and the amount of water supplied during the rinsing process is less than that during the washing process.

On the other hand, the contact T ₃ has been switched to the a side, the water supply valve 37 is activated, and water is supplied into the inner tank 2 . At the same time, contact T ₄ has moved to the b side, contact T ₅ has moved to the ON state, contact T ₇ has moved to the a side, and contact T ₈ is configured to repeat short on-off operations. has been done.

The water supply operation progresses and the pressure switch 12 is set to NC.
When switching from the NO side to the NO side, the motor 19 intermittently repeats short unidirectional rotations. The rotation period of the motor 19 at this time is determined by the on-off time of the contact _T8 . This intermittent rotational movement of the motor 19 is transmitted to the inner tub 2 by the action of the braking magnet 39 and the washing/spindle switching clutch.
Therefore, the inner tank 2 performs intermittent rotation.

The intermittent rotation period of the motor 19 is configured so that the water in the inner tank 2 does not overflow from the upper opening of the inner tank 2 due to centrifugal force.

After the above-mentioned rinsing process is completed, the same operations as the above-mentioned draining/spin-drying process are performed, and a series of washing processes is completed.

As is clear from the above embodiments, according to the present invention,
By using one pressure switch, different water levels can be set during the washing process and the rinsing process, resulting in very low costs and a reduction in assembly man-hours.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a washing machine with a dehydrating function according to an embodiment of the present invention, Fig. 2 is a schematic cross-sectional view of a pressure switch used in the washing machine, and Fig. 3 is an electrical circuit diagram of the washing machine. Figure 4 is a diagram of the timer program. 2...Inner tank, 12...Pressure switch, 30...
Pressure setting spring, 34...Magnet.

Claims (1)

[Claims] 1. An inner tank whose circumferential wall except at least the upper end is a non-porous wall and which performs dehydration and washing, a pressure switch that detects the water pressure of this inner tank and makes it possible to set multiple water volumes, and a motor that rotationally drives this inner tank. , a water level setting magnet for the pressure switch and a timer for controlling energization of the motor, and the pressure switch has a pressure setting spring that changes the operating pressure depending on the overall length, and a pressure setting spring that changes the operating pressure depending on the overall length of the pressure switch. The timer is configured with a variable magnet that allows multiple water flow settings, and during the rinsing process, the timer causes the magnet to set the water flow setting of the pressure switch to a water flow less than the rated water flow during the wash process. The washing machine also serves as a dewatering/dehydrating washing machine, in which the motor is driven and the motor is energized so as to drive the inner tub intermittently.