JPH0237197B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a dewatering machine having a dewatering and rinsing process for rinsing laundry by pouring water into a rotating tank and performing a centrifugal dewatering action caused by the rotation of the water.

[Technical background of the invention]

Conventionally, there have been devices in which the above-mentioned dewatering and rinsing action is obtained on the dehydrator side of a two-tub washing machine or in the rotating tub of a dual-dehydrating washing machine.

Although the present invention can be applied to any of the above-mentioned types of washing machines, for the sake of convenience, the description will be made using a washing machine that also performs dehydration and dehydration as an example with reference to FIG. In FIG. 1A, numeral 1 is a rotary tank rotatably installed inside the water receiving tank, and as is well known, has a large number of dewatering holes in the peripheral wall (possibly only in the upper end), and in the inner bottom. A water injector 3 having a pulsator 2 and a water inlet group formed at the bottom thereof is disposed above the upper opening of the rotating tank 1. To explain the dewatering and rinsing action of the rotary tank 1, after the water is drained at the end of washing, the rotary tank 1 is driven to rotate to perform a dehydration process for removing the detergent solution, and then a so-called dewatering and rinsing is performed. In this dehydration and rinsing, as shown in FIG. 1A, water is poured into the rotating tub 1 from a water injector 3 so as to sprinkle the laundry 4 inside, and then the rotating tub 1 is driven to rotate to perform centrifugal dewatering. This provides a rinsing effect. The dewatering and rinsing modes include a mode in which the rotary tank is intermittently driven with continuous water injection, and a mode in which water injection and driving of the rotary tank are alternately repeated.

[Problems with background technology]

In any of the above modes, after the dehydration process for removing detergent liquid, the laundry 4 in the rotating tub 1 is unevenly distributed as shown in FIG. 1B, or as shown with reference numeral 4a in FIG. 1C. If the laundry is partially present in the center, water injection only during the drive stop period (power cut-off period of the rotary tank drive motor) during the intermittent drive cycle of the rotary tub 1 for dehydration and rinsing will
The laundry in the unevenly concentrated areas and the laundry in the center do not receive enough water, and are therefore centrifugally dehydrated without reaching a complete and sufficient water content. There was a risk that the water would get wet and cause uneven rinsing.

[Purpose of the invention]

The present invention has been made in order to eliminate the above-mentioned drawbacks, and its purpose is to prevent the rinsing process from occurring even if the water content in the laundry distribution becomes insufficient when water is poured into the rotating tank during the dewatering and rinsing process. An object of the present invention is to provide a dehydrator that can reduce the tendency of unevenness.

[Summary of the invention]

The dewatering machine of the present invention includes a long dewatering process by rotating a rotary tank, a long water injection process by turning the rotary tank into a low speed rotation state and injecting water into the rotary tank, and a water injection process that takes longer than the dewatering process. A control means is provided for sequentially executing a dewatering section in which the rotating tank is rotated for a short time and a dewatering rinsing step in which a water injection section is alternately repeated in which water is injected into the rotating tank for a shorter time than the water filling step. .

[Embodiments of the invention]

An embodiment in which the present invention is applied to a dehydrating/washing machine will be described below with reference to the drawings including FIG. 1 described above.

FIG. 2 shows the principle of the control circuit configuration, which is the control means for controlling only the portions that control each step of dewatering, water filling, and dehydrating rinsing. In this Figure 2,
5 and 6 are power supply lines to which AC power voltage is applied; 7 to 9 are timer cam switches (not shown); 10
1 is a water supply valve that controls water supply to the water injector 3, and 11 is a motor for driving the rotating tank.

The standard course program in the dehydrating/washing machine of this embodiment has the steps shown in FIG. In FIG. 4, the primary dehydration step S1 means a dehydration step for removing detergent solution, and the normal rinsing step is a step in which a water stream is formed in the rotary tank 1 for rinsing. On the other hand, FIG. 3 is a time chart showing a partial stroke section of FIG. 4 and the on/off modes of the cam switches 7 to 9 in this section, and the switch-on states are indicated by diagonal lines. Also,
In FIG. 3, the symbol Sa given during the dehydration rinsing process SD indicates the centrifugal dehydration section, and Wa indicates the water injection section.

Next, the functions of the parts directly related to the present invention in the above configuration will be explained. First, after the washing in the rotary tub 1 is completed and the laundry is drained, the laundry is transferred to a primary dewatering step S1 for the purpose of removing detergent contained in the laundry, as in the conventional case. Here, the cam switch 9 is closed, and as a result, the contact pieces ca and a of the cam switch 7 are intermittently turned on and off in the first half, and then continuously turned on.
As in the prior art, the motor 11 is energized intermittently in the first half and then continuously, dehydration is carried out for a long time and the detergent liquid is separated. The next step is the first water injection step WS realized by the present invention.
1, the cam switch 8 is switched on between contacts c and a, the water supply valve 10 is energized, and during this time the motor 11 is cut off by the cam switch 9. However, the rotating tub 1 is not particularly braked and is in an inert rotation state after the completion of the primary dewatering process S1, and therefore water is injected from the water injector 3 into the rotating tub 1, which is in this low-speed rotating state, to hydrate the laundry. . The reason why water is poured while allowing the rotary tub 1 to rotate in this way is to spray water onto the laundry as evenly as possible.

In this way, after the water injection operation is performed for a long time in the first water injection process SW1, the process moves to the dewatering and rinsing process SD, and as shown by symbols Sa and Wa, the movable contact piece c of the cam switch 7 is changed to the fixed contact piece. By alternately switching between a and b, the centrifugal dewatering operation and the water injection operation are alternately and intermittently performed, thereby performing a so-called dewatering rinse. In this case, as is clear from FIG. 3, the dewatering section Sa that performs the same operation as the primary dehydrating step S1 is set to a shorter time than the primary dehydrating step S1, and the water filling section Sa that performs the same operation as the first water filling step WS1. Although Sb is set to a shorter time than the first water pouring step WS1, the laundry that has been sufficiently hydrated in the first water pouring step WS1 is washed with the remaining detergent by the start of this dehydration rinse step SD. Dehydrated. When the dewatering and rinsing process SD is completed, the process moves to the second water injection process WS2, and here, as in the previous first water injection process SW1, sufficient water content is achieved in the laundry by only water injection for a long time, and in this state. The process moves to the next intermediate dehydration step S2, where dehydration and rinsing are completed. Note that this intermediate dehydration step S2
When the motor 11 is de-energized at the end of the process, the rotary tank 1 is braked as in the conventional case, thereby preventing redundancy in stroke time.

In the above operation, the first water injection process WS1 is interposed between the dehydration rinse process SD and the primary dehydration process S1 preceding this to ensure a long water injection time. Even if the laundry 4 is in a distribution state where it is difficult to have uniform water content, such as in Figure 1 B and C, a sufficient amount of water is sprinkled on the laundry to make it fully hydrated, and then it is dehydrated and rinsed. As the process is shifted to SD, the tendency for uneven rinsing is significantly alleviated.

The dewatering and rinsing process SD as described above is performed by pouring water into the rotating tank 1 up to a specified water level at the top thereof and then rotating the pulsator 2.
Alternatively, compared to overflow rinsing in which water injection is continued thereafter, water can be saved by repeatedly injecting a small amount of water and dewatering. For this purpose, the first water injection process WS1 can be functionally called a part of it.

For reference, here are the results of a performance test in accordance with JIS standards: using tap water with a conductivity of 80μV/cm,
In addition, as a result of measuring the conductivity of the rinse water at the end of the rinsing process under the condition that the water injection amount is 25 liters, the results of Fig. 1 A, B, and C when the first and second water injection processes WS1 and WS2 are not included. are 95μV/
cm, 120 μV/cm, and 140 μV/cm, whereas in the case where water injection steps WS1 and WS2 were provided, the values were 90 μV/cm, 95 μV/cm, and 100 μV/cm, respectively, in the above order.

Note that the present invention is not limited to the above-mentioned embodiment, and as shown by the dotted line in FIG. 2, the manual switch 12 is connected in parallel with the contacts c and b of the cam switch 7, and It may be possible to switch the water injection mode to either intermittent water injection or continuous water injection. Also, the second water injection process WS
2 may be provided as necessary, and it goes without saying that the present invention is not limited to a washing machine that also performs dehydration and washing.

〔Effect of the invention〕

As described above, the present invention provides a dehydrator that can reduce the tendency of uneven rinsing even if the laundry distribution is such that water content tends to be insufficient if only water is poured into the rotating tank during the dehydration and rinsing process. It is possible.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the dehydration and rinsing status of a washing machine that also serves as a dehydrator, Fig. 2 is a wiring diagram showing the main parts of the control circuit of an embodiment of the present invention, Fig. 3 is a time chart of Fig. 2, and Fig. 4 is a process explanatory diagram. In the figure, 1 is a rotating tank, 3 is a water injector, 7 to 9 are timer cam switches, 10 is a water supply valve, and 11 is a motor.

Claims (1)

[Scope of Claims] 1. A dehydrator characterized by comprising a control means for sequentially executing steps (a) to (c) described below. (a) Long dehydration process by rotating a rotary tank. (b) A long water injection process in which the rotating tank is rotated at a low speed and water is poured into the rotating tank. (c) A dehydration rinsing process in which a dehydration section in which the rotary tank is rotated for a shorter time than the dehydration step and a water injection section in which water is injected into the rotary tank for a shorter time than the water injection step are alternately repeated.