CN1572959A - Washing machine - Google Patents

Abstract

The present invention relates to washing machines. The object of the present invention is to provide a washing machine capable of evenly spreading high-concentration washing liquid on the clothes to be soaked, thereby improving the washing ability. The washing process of this washing machine is as follows: the detergent is dissolved in a small amount of detergent dissolving water to form a detergent concentration of, for example, 80 to 300 times the high-concentration detergent liquid, and this high-concentration detergent liquid is diluted to 5 20 times the concentration of detergent, spread it and soak it in the washed clothes. Then, there is a pre-washing process of applying mechanical force to the laundry. In this pre-washing process, the stirring impeller (4) is controlled to apply mechanical force to the laundry (38) in the washing and dehydrating cylinder (2). ), so that it moves relative to the washing and dehydrating cylinder (2), so that the laundry (38) swings, and the high-concentration detergent liquid fully soaks the laundry (38), so as to improve its cleaning ability.

Description

washing machine

technical field

The present invention relates to a washing machine, in particular to a washing machine which can improve the cleaning ability by soaking the laundry in the high-concentration detergent liquid in the washing and dehydrating drum, and then performing the washing process of water supply.

Background technique

In the structure of an ordinary fully automatic washing machine, the work is carried out according to the following procedures: detecting the amount of laundry put into the washing and dehydrating drum; putting in the amount of detergent corresponding to the amount of laundry; in the washing process, according to the amount of laundry After supplying a corresponding amount of tap water (washing water), the agitating impeller is rotated in the forward and reverse directions, or the washing and dehydration cylinder is rotated in one direction, or it is rotated in the forward and reverse directions, and mechanical force is applied to the washed clothes. Then, carry out the cleaning process, while supplying tap water (cleaning water), apply mechanical force to the washed clothes in the same way; then, perform the dehydration process by rotating the washing and dehydrating cylinder, and use the method of centrifugal dehydration to make the washed clothes The washing water contained in the dehydration. Afterwards, in the washing and drying machine for drying the washed clothes, a hot air drying process is carried out to dry the clothes with hot air.

In this kind of automatic washing machine and washing and drying machine, the amount of synthetic detergent dissolved in the washing water in the washing process is generally about 20g/30L (detergent amount/washing water amount), and the concentration of detergent in the washing water is 0.07 %about.

When washing with the washing water of this detergent concentration, since the chemical cleaning ability of the detergent is not too large, in order to remove the dirt attached to the washed clothes, it is necessary to increase the rotational force of the agitating impeller of the washing machine. , or the rotational force of the washing and dehydrating drum, or prolong the washing time to strengthen the mechanical force acting on the washed clothes. As a result, there is a reality that there is either a sharp increase in damage to the washed laundry due to mechanical force, or an increase in entanglement of the washed laundry.

Moreover, when the entanglement of the laundry increases, the clumping of the laundry increases, making it difficult to take out the laundry. In addition, in the washing and drying machine, hot air drying in the washing and dehydrating tank becomes difficult due to the occurrence of lumps, or the washed clothes appear wrinkled. In order to perform hot air drying, it is necessary to reduce the mechanical force acting on the laundry, thereby reducing the entanglement of the laundry, and as a result, the decontamination condition deteriorates.

Therefore, in the past, in order to reduce the mechanical force acting on the laundry in the washing process, it has been proposed to add a pre-soaking process in which the washed clothes are immersed in a high-concentration detergent solution before the washing process. Detergent to improve the full-automatic washing machine solution of chemical cleaning ability (for example, please refer to Patent Document 1, Japanese Patent Application Laid-Open No. Hei 7-80182, page 5, Fig. 1).

In the example disclosed in Patent Document 1, as a pre-soaking process, a high-concentration washing liquid is sprinkled on the laundry while the washing and spin-drying drum is rotating. At this time, the high-concentration washing liquid soaks into the laundry due to centrifugal force.

However, the user randomly puts the laundry into the washing and dehydrating tub, and the laundry is not necessarily in a balanced state in the tub. In this way, due to the imbalance of the laundry, the washing and dehydration drum cannot be rotated at a sufficiently high rotational speed in the above-mentioned presoaking process, and sometimes the high-concentration detergent solution does not fully penetrate the laundry.

In addition, since the high-concentration detergent liquid is sprinkled during the rotation of the washing and dehydrating drum, the washing liquid will generate foam. Due to the resistance of this foam, it is also impossible to make the washing and dehydrating drum allow the washing liquid to pass through the clothes. Such a high speed rotation (especially in the case of a large amount of laundry).

Contents of the invention

The present invention is proposed in view of these problems, and its purpose is to provide a washing machine that can evenly sprinkle high-concentration washing liquid on the laundry to soak it, thereby improving its cleaning ability.

To achieve the above object, the washing machine of the present invention is a washing machine that supplies water and carries out the washing process after soaking the washing clothes in the washing and dehydrating cylinder in the high-concentration detergent liquid, and is characterized in that it has the following functions: Control device for process control:

A high-concentration detergent liquid forming process in which detergent is dissolved in washing dissolved water to form a high-concentration detergent liquid;

A soaking process in which the above-mentioned high-concentration detergent liquid is diluted and spread and soaked in the laundry;

A pre-washing process in which mechanical force is applied to the laundry after the above-mentioned soaking process; and

After the above-mentioned pre-washing process, the necessary amount of water is supplied for washing, and the washing process is a washing process in which mechanical force acts on the washed clothes in the formed washing water.

Here, in the pre-washing process, the above-mentioned control device controls the rotation or agitation of the laundry by means of the relative movement between the stirring impeller and the washing and dehydrating cylinder, which exert mechanical force on the laundry in the washing and dehydrating cylinder. . Utilizing this working process, the clothes to be washed can be fully soaked with high-concentration detergent liquid, so as to improve the washing ability of the washing machine.

Description of drawings

Fig. 1 is a schematic view showing a longitudinal section of a washing and drying machine according to an embodiment of the present invention;

Fig. 2 is a plan view of the top cover seen from above after the back panel and the outer cover are removed of the washing and drying machine of the embodiment;

Fig. 3 is a longitudinal sectional view showing the specific structure of the washing and drying machine shown in Fig. 1;

Fig. 4 is a block diagram showing the electrical structure of the washing and drying machine of the embodiment;

Fig. 5 is a flow chart of the control processing of each process executed by the microcomputer of the control device of the washing and drying machine of the embodiment;

Fig. 6 is a comparison diagram showing the cleaning ability of the washing and drying machine of the embodiment (implementing preliminary washing) and the cleaning ability when not implementing preliminary washing;

Fig. 7 is a comparison diagram showing the entanglement rate of the clothes in the washing and drying machine of the embodiment (preparatory washing is performed) and the entanglement of the clothes when the preliminary washing is not performed and when the washing time is prolonged;

Detailed ways

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The present invention relates to a washing machine that effectively utilizes the chemical cleaning ability of a high-concentration detergent solution, but this embodiment describes an embodiment of a washing and drying machine in which a drying function is added to this washing machine.

The washing and drying machine of this embodiment can carry out the following various processes: after detecting the amount of laundry to be washed, determine the amount of washing water (the water level of the washing water), and determine the detection process of the required amount of powder synthetic detergent; after dissolving the powder synthetic detergent with water A high-concentration detergent liquid forming process to form a high-concentration detergent liquid; a pre-water supply process to add water to the laundry to make it wet; dissolve powder synthetic detergent, dilute the formed high-concentration detergent liquid, and sprinkle it at the same time The soaking process of cloth and soaking the washed clothes that have been soaked; the pre-washing process of applying mechanical force to the washed clothes that have been soaked with high-concentration detergent liquid; the washing process; the rinsing process; the dehydration process; the hot air drying process.

Fig. 1 is a schematic diagram of a longitudinal section of a washing and drying machine according to an embodiment of the present invention, and Fig. 2 is a top cover 9 seen from above after removing the rear panel 11 and the outer cover 31 in the washing and drying machine shown in Fig. 1 3 is a vertical sectional view showing a specific structural example of the washing and drying machine shown in FIG. 1 .

Number 1 in the accompanying drawings is a frame that constitutes the outer contour of the washing and drying machine. The symbol 2 is a washing and dehydrating cylinder arranged in the center of the frame body 1. There is a water hole 2a on the cylinder wall around it, a fluid balancer 3 is arranged on its upper edge, and a free-flowing cylinder is provided on the inner side of its bottom. Rotating impeller 4. The stirring impeller 4 has a water passing hole 4a, and an inner blade 4b is arranged inside it. Reference number 5 is the outer cylinder that surrounds above-mentioned washing and dehydration cylinder 2, and the outside of its bottom, by means of the installation base plate 7 that steel plate is made, is provided with drive unit 6. The washing and dehydrating cylinder 2 supports it in a suspended manner by means of anti-vibration supporting devices 8 on the four corners of the upper end of the frame body 1 .

Stirring impeller 4 has the big diameter (the size of diameter is more than 90% of the inner diameter of washing and dehydrating cylinder 2) that has covered washing and dehydrating cylinder 2 most bottoms, its peripheral part bends upwards and expands gradually to form a bowl shape, its The structure can rotate under the state of receiving and supporting the laundry 38 .

The inside of the driving device 6 is equipped with a driving motor 61 , an electrically operated clutch mechanism 62 and a planetary gear reduction mechanism 63 . By using the electric operating machine 62a to convert the electrically operated clutch mechanism 62, the driving device can have the following optional driving functions: the agitating impeller 4 is rotated (stirring mode) while the washing and dehydrating cylinder 2 is stationary; The combined dehydration cylinder 2 and the stirring impeller 4 rotate in opposite directions respectively (washing mode); the washing and dehydration cylinder 2 and the stirring impeller 4 are rotated together in the same direction (dehydration·drying mode).

The top cover 9 forming the clothes inlet 9a is embedded in the end edge of the inlet, covers the opening on the top of the frame body 1, and is mounted on the frame body 1 together with the front panel 10 and the rear panel 11 with mounting screws.

The clothes inlet 9a formed on the top cover 9 is folded into 2 folds (folded into a gable) when opened, and the outer cover 31 that is installed on the top cover 9 with a hinge 31a can cover it freely. The inner side clothing inlet 28a formed on the outer cylinder upper cover 28 installed on the upper end of the outer cylinder 5 can be covered by the inner cover 32 mounted on the outer cylinder upper cover 28 with a hinge 32a.

The front housing portion formed between the top cover 9 and the front panel 10, that is, the inside of the front panel box 12 is installed with a power switch 13 and an input switch group 14a, and an operation panel 14 with a display element group 14b, an unbalance detection sensor 43, and lid switch 44. The unbalance detection sensor 43 is to detect the imbalance caused by the laundry 38 inside the washing and dehydrating cylinder 2 when the washing and dehydrating cylinder 2 is rotated, whether the vibration of the washing and dehydrating cylinder 2 (outer cylinder 5) exceeds the specified Numerical sensors. In addition, the cover switch 44 detects the open/close state of the outer cover 31 .

The input switch group 4a of operation panel 14 comprises following various switches: the switch of setting washing operation process (standard, strong washing, weak washing, drying, manual operation, quilt etc.); processing, drying, etc.) switch; in the case of continuous washing to drying, setting the switch of the washing and drying operation process (standard, shirt, wool, etc.); setting the washing time and spin time, water volume, rinsing Switching of washing conditions such as the number of times.

The rear accommodating part formed between the top cover 9 and the rear panel 11, that is, the inside of the rear panel box 17, is equipped with a washing water supply device and a high-concentration detergent liquid forming and supplying device arranged side by side, and according to The water level in the outer cylinder 5 is a water level sensor 15 that generates a water level signal, and a control device, that is, a control unit 16 .

The washing water supply device is composed of a main water supply solenoid valve 20. The water inlet of the solenoid valve 20 is connected to the connection port 18 of the faucet. Furthermore, a water supply device made of a bath water pump 81 can also be provided, the water inlet of the bath water pump 81 is connected on the hose interface 82, and after passing through the pipe part 83 and the detergent dissolving container 21, its water outlet is connected with the water injection port 19.

The high-concentration detergent liquid forming and supplying device supplies a small amount of detergent dissolving water to the detergent dissolving container 21 by the auxiliary water supply solenoid valve 22, and synthesizes the powder by stirring the powder put into the detergent dissolving container 21 with an electric-driven stirring impeller. Detergent, at the same time, dissolve it with the above-mentioned detergent dissolving water to form a high-concentration detergent liquid. The detergent dissolving container 21 has an overflow portion 21a connected to the water supply port 19. When the formed high-concentration detergent liquid is supplied with water (diluted water supply) to dilute it and increase the amount of water, it overflows from the overflow portion 21a to supply Give water injection port 19.

Here, in order to form the detergent dissolved water for the high-concentration detergent liquid, when the set amount of water overflowing from the overflow portion 21a of the detergent dissolution container 21 is so small as to not overflow and the dilution water is supplied, in order to dilute to just enough The detergent concentration to saturate the laundry is structured such that the main water supply solenoid valve 20 is also opened to supply increased dilution water to the water injection port 19 .

In order to arrange the detergent dissolving container 21 in the rear panel box 17, its size is preferably about 400 to 500 mL. In the process of dissolving the powder synthetic detergent to form a high-concentration detergent solution, in order not to overflow the water overflow part 21a, the amount of detergent dissolved water should be 150-300mL. The difference in the amount of water dissolved in the detergent is due to the different types (brands) of powder synthetic detergents. During the process of detergent dissolution, the foaming state caused by the involvement of air is different. Detergent with a lot of foaming is easy to overflow due to the increase in apparent volume during the dissolution process, so the amount of water in which the detergent dissolves must be reduced. In fact, there are various types of detergents and foaming states. In order to prevent water overflow, it is best to set the amount of detergent dissolved in about 150-200mL.

The amount of washing water in a washing and drying machine with a washing capacity of 8 kg is about 24 to 68 L. The detergent concentration of the high-concentration detergent liquid formed after dissolving the powder synthetic detergent with detergent dissolved water is equal to the detergent concentration of the washing water. 80 to 500 times. In order for this high-concentration detergent solution to spread and soak into the laundry, it should be diluted 5 to 20 times (ideally about 10 times).

When the detergent dissolving container 21 of the high-concentration detergent liquid forming and supplying device is provided with an auxiliary agent input device, its structure is that an auxiliary agent input chamber 21b is attached in the detergent dissolving container 21. In this auxiliary agent An auxiliary water supply solenoid valve 22a for water supply is provided in the injection chamber 21b. By supplying water from the auxiliary water supply solenoid valve 22a, the softening aid injected into this auxiliary agent injection chamber 21b can be supplied to the above-mentioned water injection port 19 through the overflow from the auxiliary agent injection chamber 21b.

The water injection port 19 passes the bottom of the top cover 9 and the rear portion of the outer cylinder loam cake 28 of the outer cylinder 5, and is opened towards the inner opening of the washing and dehydrating cylinder 2 top opening. The water injection port 19 is formed by a flexible pipe 19a connected between the detergent dissolving container 21 and the outer cylinder upper cover 28, and a sprinkler cover 19b arranged under the outer cylinder upper cover 28. The sprinkling cover 19b is groove-shaped, and forms a space 19d with the upper cover 28 of the outer cylinder, and has many small holes 19c on its lower surface. The water that flows into the sprinkler cover 19b is distributed in the space 19d, and then falls onto the laundry 38 in the washing and dehydrating cylinder 2 in the form of spraying from the small hole 19c.

The hot air circulation drying device has the following various parts: the suction port 5a formed on the side wall near the bottom of the outer cylinder 5 is formed by extending upwards in a vertical state along the outer wall surface of the outer cylinder 5 rear side, and blocks the suction from the above-mentioned suction. The water-cooled dehumidification pipeline 23 of the washing water infiltrated from the outlet 5a; located at the upper part of the water-cooled dehumidification pipeline 23, the cooling sprinkler part 24 that supplies cooling water to this pipeline; at a position higher than the water level of the outer cylinder 5 of the washing process Folding back, the descending air duct 25 extending vertically downward along the outer wall of the outer cylinder 5; arranged in the space below the outer cylinder 5, using the air sucked from the above-mentioned descending air duct 25 to generate a circulating fan 26 for circulating air; The exhaust port of the circulation fan 26 is along the ascending air passage 27 extending vertically upwards on the outer wall surface of the outer cylinder 5; heater) 29; The cooling water sprinkling portion 24 is connected to the sprinkling valve 24a through a pipe 24b.

Above-mentioned water-cooling and dehumidification pipeline 23, descending air passage 25 and ascending air passage 27 are installed on the outer wall surface of outer cylinder 5 rear side, are arranged on the circumferential direction of this outer cylinder 5 and are made into a whole.

A humidity detection device, that is, a humidity sensor 40 and a first temperature sensor 41 is provided in the descending air passage 25 , and a second temperature sensor 42 is provided in the air passage between the downstream side of the heater 29 of the exhaust port 30 . In order to detect with high precision the humidity and temperature of the circulating air that has undergone water cooling and dehumidification in the water cooling and dehumidification pipeline 23, the circulating air after the water cooling and dehumidification can be well mixed to make it uniform, and then combined with the above humidity sensor 40 is in contact with the first temperature sensor 41, therefore, the humidity sensor 40 and the first temperature sensor 41 are to be arranged at the lower part of the descending air duct 25 away from the water-cooled dehumidification pipeline 23, or on the suction port casing 26c of the circulating fan 26 .

In addition, a cotton thread debris collecting device 51 is also provided on the turn-back portion from the water-cooled dehumidification pipeline 23 to the descending air duct 25 .

And this hot air circulation drying device discharges the washing water in the outer cylinder 5 after washing, makes the washing and dehydration cylinder 2 rotate at a high speed, and after dehydration, while making it rotate at a low speed, also by means of the circulation fan 26. Operation, extract the humid air in the outer cylinder 5 and the washing and dehydrating cylinder 2 from the suction port 5a, and make it rise in the water-cooled dehumidification pipeline 23, by means of supplying the air in the water-cooled dehumidification pipeline 23 from the cooling sprinkling part 24 cooling water to cool and dehumidify it. Thereafter, the cooled and dehumidified air descends along the descending air passage 25, is sucked in the circulation fan 26, and is sent to the exhaust port 30 from the circulation fan 26 through the ascending air passage 27 and the heater 29, and is heated by the heater 29. , toward the direction opposite to the rotation direction of the washing and dehydrating cylinder 2, and blow toward the vicinity of the inner wall surface in the washing and dehydrating cylinder 2. Thus, the circulating air blown into the washing and dehydrating tub 2 contacts the laundry 38 in the washing and dehydrating tub 2 to dry it.

A drain port 5 b formed at the bottom of the outer cylinder 5 is connected to a drain hose 34 through a drain solenoid valve 33 . The air trap 5c is connected to the above-mentioned water level sensor 15 through an air tube 35 . On the edge of the lower end of the frame body 1, a base 37 made of synthetic resin is mounted with support posts 36 at four corners.

The driving device 6 has the following components: a driving motor 61, an electrically operated clutch mechanism 62, a planetary gear reduction mechanism 63, a central output shaft 64 and an outer output shaft 65, which are assembled into a whole on the lower surface of the mounting base plate 7 made of steel plate, The above-mentioned installation bottom plate 7 is fixedly installed on the bottom surface of the outer cylinder 5 with screws.

The drive motor 61 can use a multi-stage or stepless variable speed motor that can be reversed. In this embodiment, this motor can control the following various speeds at optimum values: when detecting the amount of clothes, the rotating speed of the stirring impeller 4 is rotated; The rotation speed; when the high-concentration detergent solution is sprinkled on the laundry to soak it, the rotation speed of the washing and dehydrating cylinder 2 and/or the stirring impeller 4 is rotated; during pre-washing, the center of the planetary gear reduction mechanism The speed at which the gear rotates; the speed at which the center gear of the planetary gear reduction mechanism rotates during washing; the speed at which the washing and dehydrating cylinder 2 and the stirring impeller 4 rotate together during dehydration; 2. The rotational speed at which the stirring impeller 4 rotates together; and the rotational speed at which the stirring impeller 4 is rotated alone.

In the planetary gear reduction mechanism 63 , the carrier supporting the planetary gears is connected to the center output shaft 64 , the inner gear is connected to the outer output shaft 65 , and the sun gear is directly connected to the drive motor 61 .

In addition, the electric operation clutch mechanism 62 can selectively set the following three operation modes by operating the operation lever 62b with the electric operation machine 62a: stirring mode; washing mode; dehydration and drying mode. In the stirring mode, by combining the internal gear of the planetary gear reduction mechanism 63 on a stationary part, in the state where the static force acts on the washing and dehydrating tub 2, the rotational force of the driving motor 61 is decelerated by the planetary gear. The mechanism 63 and the central output shaft 64 are transmitted to the stirring impeller 4 to make the stirring impeller 4 rotate, and according to the load acting on the stirring impeller 4, the detection of the quantity and the quality of the clothes are carried out. In the washing mode, when the internal gear of the planetary gear reduction mechanism 63 can rotate freely, the drive motor 61 drives the sun gear to rotate, and the rotational force of the drive motor 61 is transmitted to the center output shaft in two opposite directions. 64 and the outside output shaft 65, so that the washing and dehydration cylinder 2 and the stirring impeller 4 are repeatedly rotated positively and negatively in two opposite directions to wash. In addition, in the dehydration and drying mode, the internal gear of the planetary gear reduction mechanism 63 is in a state connected to the drive motor 61, and the drive motor 61 simultaneously drives the central gear and the internal gear to rotate together, so that the central output shaft 64 and the outer output The shaft 65 rotates in the same direction, so that the washing and dehydrating cylinder 2 and the stirring impeller 4 rotate in the same direction at a low speed for pre-water supply, then they are rotated at a high speed for centrifugal dehydration, and finally they are rotated at a low speed. Dry with hot air.

FIG. 4 is a block diagram showing the electrical configuration of such a washing and drying machine.

In FIG. 4, the control part 16 is the control part of the washing and drying machine comprised centering on the microcomputer 16a, and operates with the electric power supplied from the power supply circuit 16b supplied by commercial power supply. The microcomputer 16a is connected to the input switch group 14a and the water level sensor 15, the humidity sensor 40, the first and second temperature sensors 41 and 42, the unbalance detection sensor 43, and the cover switch 44, and it accepts signals of the following various information: The signal of the user's operation button, the signal of the water level in the washing and dehydrating cylinder 2, the temperature and humidity in the descending air duct 25, etc. The signal output from the microcomputer 16a is supplied to the driving circuit 16c, and the commercial power supply is supplied to the following parts, and controls the switch or rotation of these parts: the main electromagnetic water supply valve 20, the auxiliary electromagnetic water supply valves 22 and 22a, the cooling sprinkler solenoid valve 24a, the drain Electromagnetic valve 33, detergent stirring motor 39, circulation fan 26, etc. In addition, in order to let the user understand the operation of the washing and drying machine, it also controls the display element group 14b to display the ongoing operation.

The input switch group 14a of the operation panel 14 has the following various switches: a switch for setting the washing operation course (standard, strong washing, weak washing, drying, manual operation, bedding, etc.); processing, drying, etc.) switch; in the case of continuous washing to drying, setting the switch of the washing and drying operation process (standard, shirt, wool, etc.); setting the washing time and dehydration time, water volume, number of rinses Wait for the switch of washing conditions.

The bridge rectifier circuit 70 connected to the commercial power supply performs full-wave rectification on the commercial power supply, and then inputs it to the DC-DC conversion circuit 72 for improving power factor and boosting voltage. The DC-DC conversion circuit 72 modulates this rectified voltage with semiconductor elements such as IGBTs, and supplies the boosted DC power to the PWM inverter circuit 65 while improving the power factor of the common power supply. This output voltage is variable, and is used to control the load of driving a rectangular wave of the semiconductor element output from the microcomputer 16a. The PWM inverter circuit 65 generates a three-phase RWM rectangular wave voltage from the above-mentioned DC voltage, so as to be applied to the driving motor, ie, the DC brushless motor 61, to make it rotate. Inside the DC brushless motor 61, a Hall element 61a serving as a rotor position detection means is incorporated. After the position of the rotor is detected by the Hall element 61a, it is transmitted to the microcomputer 16a. Then, the microcomputer 16a controls the rotational speed and rotational direction of the DC brushless motor 61 according to the rotor position, rotational speed and other information.

Next, the working process of the above-mentioned various steps of the washing and drying machine having such a structure will be described. FIG. 5 is a flow chart of the above-mentioned respective steps performed by the microcomputer 16 a in the control unit 16 .

When the washing start button switch in the input switch group 14a is pressed, the microcomputer 16a performs the following various control processes.

Step 401

When the user puts the laundry 38 into the washing and dehydrating tub 2, operates the input switch group 14a on the operation panel 14, performs initial setting, and presses the button switch to start washing, the microcomputer 16a starts to perform automatic operation of each process. Operational control processing.

In the above-mentioned initial setting, it is necessary to set the washing operation process suitable for washing clothes, and also set the washing time, dehydration time, water volume, number of times of rinsing, etc. as required. Also, in the case of drying after washing, it is necessary to set the course of washing and drying.

Step 402

In step 402, detection and control processing of the amount of laundry 38 is performed. This kind of laundry amount detection is to control the electrically operated clutch mechanism 62 of the driving device 6 to the agitation mode in the state of dry clothes before water supply, to energize the drive motor 61 for a short time, to drive the agitation impeller 4 to rotate, and to increase the speed according to the rotation speed. When the acceleration characteristics, or when the power supply to the drive motor 61 is stopped, the deceleration characteristics during inertial rotation are detected. According to this detection result (clothes amount of washing clothes), calculate and determine the water amount of washing water and the amount of detergent for forming the washing water of ideal detergent concentration, and display this amount of detergent by display element group 14b. Referring to the displayed amount of detergent, the user pulls out the detergent tray 73 , adds powdered synthetic detergent, and then pushes the detergent tray, so that the powdered synthetic detergent falls into the detergent dissolving container 21 .

Step 403

In step 403, a high-concentration detergent solution is formed. When detecting that the powder synthetic detergent has been dropped into the detergent dissolving container 21, the auxiliary water supply electromagnetic valve 22 is opened to supply a small amount of tap water (water for dissolving detergent) that will not overflow to the detergent dissolving container 21. Then, power is supplied to the washing stirring motor 39 to drive the stirring impeller to rotate, and while stirring the powder synthetic detergent in the detergent dissolving container 21, it is dissolved to form a high-concentration detergent liquid.

The amount of water for detergent dissolving water varies with the capacity (size) of the detergent dissolving container 21 used and the amount of powder synthetic detergent used for washing, but it must be able to completely dissolve the powder synthetic detergent. The amount of water overflowing from the overflow portion 21a does not occur during the process. For example, when the capacity of the detergent dissolving container 21 is 500 mL (the capacity up to the overflow part is 400 mL), the amount of the detergent dissolving water can be set at 150 to 200 mL. The amount of detergent dissolved in water is controlled by the opening time of the auxiliary water supply electromagnetic valve 22. The concentration of the formed high-concentration detergent solution also varies with the amount of detergent put into the detergent dissolving container 21 (the amount of laundry, the amount of washing water). For example, the amount of washing water of a washing and drying machine with a washing capacity of 8kg is about 24-68L, so the high-concentration detergent liquid should be 80-500 times the detergent concentration of the washing water.

Dissolving time takes 2-3 minutes. Because the dissolution time varies with the type of powder synthetic detergent, but even for a detergent that is not easily soluble, the dissolution rate can reach 95-100% within 2-3 minutes, so in 2-3 minutes It can dissolve most of the detergents.

Step 404

Control the electric operation clutch mechanism 62 of the driving device 6, make it in the dehydration and drying mode, make the driving motor 61 run at a low speed, and open the main water supply solenoid valve 20 while making the washing and dehydration cylinder 2 and the stirring impeller 4 rotate at a low speed. , directly supply tap water to the water supply port 19, and use the tap water as pre-supply water to spread on the laundry 38 in the washing and dehydrating tub 2. The amount of pre-supplied water is at least the amount of water (4-10L) that can moisten the uppermost pieces of laundry. When the high-concentration detergent liquid is dispersed later, the pre-supply water can prevent the possible color shift caused by the fluorescent whitening agent contained in the detergent while promoting the high-concentration detergent liquid to soak into the laundry 38 .

This pre-water supply process is performed in the step 403 of forming a high-concentration detergent solution. This point, as mentioned above, is because it takes 2 to 3 minutes to dissolve the detergent, and the washing time can be shortened by performing the pre-water supply process in the middle.

Step 405

Control the electric operation clutch mechanism 62 of the driving device 6, make it in the dehydration and drying mode, make the driving motor 61 run at a low speed, and open the auxiliary water supply solenoid valve 22 while making the washing and dehydrating cylinder 2 and the stirring impeller 4 rotate at a low speed , by supplying dilution water to the detergent dissolving container 21, the high-concentration detergent liquid is diluted, and is sent into the water injection port 19 by overflowing from the overflow portion 21a. Simultaneously, open the main water supply solenoid valve 20, supply water to the water injection port 19, dilute the high-concentration detergent liquid into an ideal high-concentration detergent liquid (5 to 20 times), and then spray it from the small hole of the water-spray cover 19b 19c sprays this high-concentration detergent liquid on the laundry 38 in the washing and dehydrating tub 2, and soaks it. Since the laundry 38 in the washing and dehydrating tub 2 rotates together with the washing and dehydrating tub 2 , the high-concentration detergent liquid can evenly drop and soak into the laundry 38 .

Because the high-concentration detergent liquid has soaked into the laundry 38, the chemical cleaning ability (permeation, emulsification, dispersion, etc.) of the high-concentration detergent liquid acts on the dirt attached to the laundry, making the dirt easy to remove from the laundry. Clothes on the state of removal.

When spreading high-concentration detergent liquid, the electrically operated clutch mechanism 62 of the driving device 6 is controlled in the washing mode, so that the forward and reverse rotations are repeatedly carried out by means of the driving motor 61, so that the washing and dehydrating cylinder 2 and the stirring impeller 4 are repeatedly rotated. Forward and reverse in the opposite direction, stirring.

The washing clothes 38 are repeatedly reversed along the circumferential direction on the stirring impeller 4 while the high-concentration detergent liquid soaks into it from the top, and gradually become the rotation of the up-down direction. This is because the top of the laundry 38 contains high-concentration detergent liquid, which is heavier, while the lower part is dry and lighter, and the laundry is reversed by the inertial force of the agitating impeller 4 when it reverses. Since the stirring impeller 4 is in the state of carrying all the laundry 38 in the shape of a bowl with a large diameter, the inertial force of the stirring impeller 4 can effectively act when reversing, and the laundry can be switched efficiently. In addition, when the stirring impeller 4 with a small diameter is used for this work process, although the mechanical force of the stirring impeller 4 partially acts on the laundry, there is no need to worry about the possibility of local damage to the clothing.

In such a process, since the washing clothes are reversed, the lighter (dry) part of the lower part is reversed to the upper part, and the high-concentration detergent liquid is sprinkled on the dry part, so that it can be efficiently and evenly distributed. Concentrated detergent solution. Furthermore, due to the agitation, the relative positional relationship of each piece of laundry 38 has changed somewhat, thereby having the same effect as rubbing and washing, and dirt can be peeled off from the laundry 38 .

In addition, immediately after the high-concentration detergent liquid starts to be sprayed, the power-on time to the drive motor 61 can be extended (about 1 to 2 seconds), and the power-off time can be shortened (0.4 to 0.8 seconds). Alternatively, the energizing voltage of the drive motor 61 may be increased. In this way, the activities of the laundry 38 in the circumferential direction and the up-down direction are increased, and the high-concentration detergent liquid can be evenly spread and soaked in the laundry 38 in a short time. When the spreading of the high-concentration detergent liquid continues, so that the laundry 38 becomes very heavy because of containing a lot of washing liquid, the time (about 0.4～0.8 seconds) to the drive motor 61 is shortened, or the power-on time is reduced. Voltage, weak agitation, thereby preventing the entanglement of clothes. However, even with weak stirring, the relative position of the laundry 38 still changes, because the gap between the laundry is constantly changing, so that the effect of high-concentration detergent liquid permeating the laundry evenly can be obtained.

Step 406

When the water level sensor 15 detects that the water level is slightly higher than the stirring impeller 4, it closes the main water supply solenoid valve 20. The water supply at this moment is about 10-20L (different from the amount of laundry), and the high-concentration detergent solution of 5-10 times the concentration scattered in the laundry 38, while soaking through the laundry, also accumulates In the outer cylinder 5, water is supplied through the main water supply valve and diluted to a state of about 3 to 4 times the concentration.

Then, control and control the electric operation clutch mechanism 62 of the driving device 6 to make it in the washing mode, and by means of the repeated forward and reverse rotation of the driving motor 61, the washing and dehydrating cylinder 2 and the stirring impeller 4 are repeatedly turned towards the opposite direction. Forward and reverse rotation is performed to shake (rotate or stir) the laundry 38 to perform the first preliminary washing.

In this first pre-washing process, the time for energizing the drive motor 61 is repeatedly shorter than the washing process (varies with the amount of laundry, for example, 0.4 to 0.8 seconds), and the time for stopping power is longer than that. long inversion. That is, the laundry 38 soaked in high-concentration detergent liquid can be efficiently shaken by stirring weaker than the washing process, and the dirt is floated from the laundry 38 by rubbing and washing.

In addition, there is such an effect that, by utilizing the pumping action of the inner blade 4b of the stirring impeller 4, the high-concentration detergent liquid accumulated at the bottom of the outer cylinder 5 is transferred from the water passage hole 4a of the stirring impeller 4 and the outer peripheral portion The pump is sucked into the washing and dehydrating cylinder 2, and the laundry 38 is supplied to the lower part (close to the stirring impeller 4) where the detergent liquid is difficult to reach when the high-concentration detergent liquid is sprayed.

In addition, the agitating impeller 4 is in the shape of a bowl with a large diameter. In the state where almost all the laundry 38 is placed on the agitating impeller 4, all the laundry 38 can be moved. The relative speed between the agitating impeller 4 and the laundry 38 is suppressed very small, so even with such a small amount of water, damage and entanglement of the laundry will hardly occur.

In addition, even if the electric operation clutch mechanism 62 of the driving device 6 is controlled in the agitation mode, and the agitation impeller 4 is reversed as described above, the same effect can be obtained. However, because the amount of water is small, the reaction force of the rotation of the agitating impeller 4 will cause the outer cylinder 5 to swing greatly and collide with the outer frame 1, which will cause noise. Therefore, it is better to control the electric operation clutch mechanism 62 to wash model.

In the above statement, the main water supply electromagnetic valve 20 is closed, and the first preliminary washing is performed after the water supply is stopped. However, the first preliminary washing can also be performed with the main water supply electromagnetic valve 20 opened. In this way, it is possible to prevent the washing time from extending beyond the necessary time.

However, when the water pressure of the tap water is very high and the water supply flow is very large, the time for the first pre-wash is too short. Therefore, open and close the main water supply solenoid valve 20 repeatedly, and shorten the opening time of the main water supply solenoid valve 20 when the water supply flow is large (the water pressure of the tap water is high), so as to reduce the average water supply. In this way, the time for the first pre-wash can be kept constant regardless of the water pressure of the tap water.

Step 407

The main water supply solenoid valve 20 and the auxiliary water supply solenoid valve 22 are opened to start supplying tap water (wash water). The supply of this washing water is generally carried out up to the amount of water determined in step 402, but is interrupted due to the detection of the amount of laundry 38 (the value of wet cloth) and the texture of the laundry during the water supply. This cutoff water level is a water level corresponding to the detected value of the amount of wet clothes and the clothes texture preset in the microcomputer 16a, and is divided into two stages: the first clothes texture detection water level and the second clothes straightness detection water level. In addition, the auxiliary water supply solenoid valve 22 is opened when the detergent dissolving container 21 is washed. The concentration of the detergent liquid that directly detects the water level of the first laundry is about 2 times.

Step 408

Detecting the first laundry level detects the amount of wet laundry on the water level and the laundry level. The detection of the straightness of the clothes requires the electric operation clutch mechanism 62 of the driving device 6 to be controlled in the stirring mode or the washing mode, to supply power to the driving motor 61 for a short time, to drive the stirring impeller 4 to rotate, and to detect the inertial rotation after power failure First deceleration characteristic (wet laundry amount).

Step 409

Start the water supply again and replenish the water up to the second cut-off water level. The washing water is diluted with water from about twice the detergent concentration, and the water supply is close to the ideal detergent concentration (one time) for washing. Simultaneously with the start of water supply, the electric operation clutch mechanism 62 of the driving device 6 is controlled in the washing mode, and the operation of the forward and reverse directions is repeated by means of the driving motor 61, so that the washing and dehydrating cylinder 2 and the agitating impeller 4 are repeatedly moved to the washing mode. The forward and reverse rotation is performed in the opposite direction, so that the laundry 38 is swung, and the second preliminary washing is performed.

In this second pre-washing, since the amount of water is stirred under the state that the amount of water determined in the second step 402 is less, the cycle of forward and reverse of stirring can be shorter than that of the washing process (that is, for The energization time of the drive motor 61 is shorter than the washing process). In this way, not only can the entanglement of the clothes and the damage of the clothes be reduced, but also the cleaning ability can be improved by utilizing the rubbing and washing effect generated by the swing of the clothes 38 to be washed.

Furthermore, since the laundry 38 is substantially all placed on the large-diameter bowl-shaped impeller 4, the friction between the laundry 38 and the wall surface of the washing and dehydrating tub 2 can also improve its cleaning ability.

In addition, the second pre-washing is a washing method performed by a conventional washing machine in which detergent powder is sprinkled on the laundry as it is. However, in the conventional method, at the time of pre-washing, part of the powdery detergent has not been dissolved, so the concentration of the detergent solution is lower than the concentration calculated by using the amount of detergent put in and the amount of water supplied. Therefore, most of them cannot improve their detergency as expected. On the contrary, in the present invention, the detergent is completely dissolved, and compared with the case where the detergent put into the original state is powder, pre-washing can be carried out with a higher concentration of detergent liquid, and the direct result is that the pre-washing is improved. cleaning ability.

In addition, the water supply flow rate is controlled according to the water pressure of the tap water (when the water pressure of the tap water is high, intermittent water supply is performed to reduce the flow rate of the water supply), so that the time for the second pre-wash can be kept constant. In this way, almost the same detergency can be obtained regardless of the water pressure of the tap water.

In addition, the second preliminary washing may be performed after step 408 with the water supply stopped. In this way, prewashing can be performed at a higher concentration, and the cleaning ability can be improved.

The second pre-wash is completed at the latest some time before the second laundry detection level is reached. This is because, during pre-washing, the water level in the outer tub 5 fluctuates, and the water level sensor 15 cannot detect the correct water level.

Step 410

When the second laundry level is reached, the main water supply solenoid valve 20 is closed to detect the amount of wet laundry and the texture of the laundry. The second deceleration characteristic (the amount of wet laundry) is detected by the same detection method as in step 408 .

According to the difference between the first deceleration characteristic and the second deceleration characteristic, the clothes of the laundry 38 are detected to be straight. Then, according to the amount of laundry and the texture of the laundry, the time of the washing and rinsing process, the water flow (strength of mechanical agitation), the dehydration time, and the control constant for the drying operation are determined. When step 408 and the clothes straight detection control in this step are not required according to the initial setting, these steps can be omitted.

Step 411

Tap water is supplied until the water quantity (water level) determined in step 402 is reached. By the above-mentioned water supply, the washing water reaches the detergent concentration (one time) suitable for washing. In this way, the laundry 38 is immersed in the washing water having a predetermined detergent concentration (one time) in the washing and dehydrating tub 2 .

Step 412

The driving device 6 is controlled so as to perform the washing process of the washing water flow and washing time set in step 408 . In this washing process, the driving device 6 controls the electrically operated clutch mechanism 62 to be in the washing mode, and the washing and dehydrating cylinder 2 and the stirring impeller 4 are repeatedly performed in the opposite direction by means of the repeated forward and reverse rotation of the driving motor 61. Forward and reverse rotation. In the washing process, in order to let the dirt attached to the laundry 38 fall off, the washing and dehydration cylinder 2 and the stirring impeller 4 are repeatedly rotated forward and reverse in the opposite direction, and the mechanical force is applied to the laundry. 38 on. In addition, due to the process of spreading and soaking high-concentration detergent liquid in step 405, and the pre-washing process of steps 406 and 409, the chemical cleaning ability and rubbing washing effect of the detergent have been used, so that the dirt on the laundry 38 is removed from the It floats out of the laundry, so even if the mechanical force is small during washing, sufficient cleaning power can still be obtained.

Here, the comparison of the cleaning ability and the clothes entanglement rate of the present invention with the conventional cleaning method will be described. The conditions of the test are: use a washing and drying machine with a washing capacity of 8kg; the amount of laundry to be washed is 4.8kg; the detergent is a commercially available powder synthetic detergent (the detergent recommended by the detergent manufacturer is 20g/30L); the water temperature is 20 °C, the hardness of water is 50ppm (converted to CaCO ₃ ); the washing time is 7 minutes.

Fig. 6 shows a comparison of detergency. If the cleaning ability without pre-washing 1 and pre-washing 2 is 1, then performing pre-washing 1 can increase the cleaning ability by 8%, and performing pre-washing 2 can increase the cleaning ability by 13%. When both 1 and prewash 2 are performed, the detergency can be increased by 20%. The following situation can be used as a reference. To increase the cleaning capacity by 20% by prolonging the washing time (only relying on mechanical force), the washing time needs to be extended to three times.

Fig. 7 shows a comparison of the entanglement rate of clothes. If the entanglement rate of the clothes without pre-washing is set as 1, the entanglement rate of the clothes increases by about 10% when both the pre-wash 1 and the pre-wash 2 are performed. However, in order to obtain the same cleaning ability, in the case of prolonging the washing time by 20 minutes, the entanglement rate of the clothes should be increased by about 60%.

In this way, pre-washing can be performed after impregnating the laundry with a high-concentration detergent solution, which can reduce the entanglement rate of the laundry and improve the cleaning ability.

Step 413

Open the drain solenoid valve 33 to discharge the washing water out of the machine.

Step 414

Open the main water supply solenoid valve 20 and the auxiliary water supply solenoid valve 22 to supply rinse water (tap water) up to the set water volume. At this moment (when performing multiple rinsing, water supply for the last rinsing), the auxiliary water supply solenoid valve 22a can be opened as required, and the softening aid can be dropped into.

Step 415

The driving device 6 is controlled to perform a rinsing process.

Step 416

Open the drain solenoid valve 33 to discharge the rinse water out of the machine.

Step 417

Under the condition that the drain solenoid valve 33 is opened, the electrically operated clutch mechanism 62 of the driving device 6 is controlled to be in the dehydration and drying mode. A whole rotates at a high speed, and the moisture in the laundry 38 is centrifugally dehydrated. In the state where the above-mentioned centrifugal dehydration is completed, the laundry 38 is attached to the side wall of the washing and dehydrating tub 2 .

Step 418

Control the electric operation clutch mechanism 62 of driving device 6, make it be in dehydration and drying mode, make drive motor 61 carry out low-speed operation, when making washing and dehydration cylinder 2 and stirring impeller 4 rotate with low speed, also make air blower 26 operation, The air inside the outer cylinder 5 is sucked out from the exhaust port 5a, cooled and dehumidified by the cooling water supplied from the cooling water distribution part 24 to the water-cooled dehumidification pipeline 23 during the ascent process in the water-cooled dehumidification pipeline 23, and then passed through the descending air duct 25, inhaled in the circulation fan 26, and then from this circulation fan 26 through the ascending air duct 27 and the heater 29, and then sent to the exhaust port 30, after being heated by the heater 29, it will produce the opposite rotation direction of the washing and dehydrating cylinder 2 Direction, the circulating air sent to the vicinity of the inner wall surface of the washing and dehydrating tub 2 makes the laundry in the washing and dehydrating tub 2 dry.

When the hot air drying is carried out on the original laundry 38 attached to the side wall of the washing and dehydrating cylinder 2 through centrifugal dehydration, in order not to make these laundry 38 wrinkle, in the drying process, the agitating impeller should be periodically activated. 4. Perform forward and reverse rotation so that the laundry 38 is agitated while drying.

As described above, since an increase in entanglement of laundry due to pre-washing is suppressed, it is possible to prevent uneven drying spots and generation of wrinkles at the time of drying due to entanglement of washed laundry.

In this example, the water supply flow rate in the pre-water supply process of making the laundry hydrated and moist is used to dissolve powder synthetic detergent to make it into a high-concentration detergent liquid for dissolving detergent, and is used to dilute high The dilute water supply flow rate and water volume of the concentrated detergent liquid, and the water supply flow rate during pre-washing are the water flow rate (the area of the water flow channel) and the water supply time through the main water supply solenoid valve 20 and the auxiliary water supply solenoid valve 22 for these water supplies. However, the actual water supply flow will vary with the water pressure of the water source (tap water pipe). Therefore, the water flow of the main water supply solenoid valve 20 and the auxiliary water supply solenoid valve 22 should be set on the basis of the water flow flow under the lowest water pressure that can be expected, monitor the water level sensor 15, and measure the flow rate when the water is supplied up to the specified water level. For the actual water supply time, the water pressure of the water source is obtained and stored in advance through calculation processing based on the measured water supply time. When the above-mentioned wet water supply, detergent dissolved water supply, and diluted water supply are performed, the main water supply solenoid is intermittently switched on and off. The valve 20 and the auxiliary water supply solenoid valve 22 perform intermittent water supply to control the flow rate so that the average value thereof reaches a prescribed flow rate.

Though the embodiment described above is a fully automatic washing and drying machine, when implemented as a washing machine without drying function, as long as the hot air circulation drying device and its control process of the above embodiment are omitted, it can also be implemented in the same way. That is, as long as the hot air circulation drying device is omitted in the above-mentioned embodiment, and the drying control processing step 418 performed by the control unit 16 of the control device is omitted, a fully automatic washing machine without a drying function can be realized.

In addition, the washing and rinsing involved in the washing machine and the washing and drying machine of the present invention may be performed in different ways.

Also, in the above-described embodiment, the washing and dehydration cylinder 2 of the vertical shape is illustrated as an example, but it can also be applied to the washing and dehydration cylinder of the horizontal shape, which is generally called a drum type.

In addition, the agitating impeller 4 that is located in the central part of the washing and dehydrating cylinder to agitate the laundry from the forward and reverse directions can also use a vibrating impeller with blades on the disc, or let The large blades are rotated forward and reverse in the range of 360° for washing, which is called agitator-type impeller. In addition, it is also possible to agitate the washing clothes at the bottom of the washing and dehydrating cylinder, and make the agitating impeller in the shape of a vibrator, and design it as an integral structure with the washing and dehydrating cylinder.

In addition, the powder synthetic detergent used can also be changed to a liquid synthetic detergent having the same detergent ingredients.

In summary, the present invention forms high-concentration detergent liquid (for example, is 80～500 times of the detergent concentration of washing water) after dissolving detergent in a small amount of detergent dissolving water, and dilutes this At the same time of high-concentration detergent liquid (for example, 5 to 20 times the detergent concentration of washing water), make it spread and soak in the laundry, and then use the stirring impeller to apply mechanical force to the laundry, so the washing The detergent liquid can evenly saturate the laundry. And, in the present invention, because when water level is low, promptly in the detergent liquid that the concentration of detergent is very high, by making agitating impeller and washing and dehydrating cylinder do relative motion to make washing clothes swing, carry out pre-washing, so While effectively exerting the chemical cleaning ability of the detergent, the mechanical force generated by the stirring impeller can also be applied to the laundry. In this way, it is not necessary to increase the mechanical force acting on the laundry during the washing process, thereby improving the cleaning ability and reducing the entanglement of the laundry.

Claims (8)

1. A washing machine, after soaking the washing clothes in the washing and dehydrating cylinder in the high-concentration detergent liquid, then supplying water and carrying out the washing process in the washing machine, it is characterized in that it has the functions of controlling the following various processes The control device: A high-concentration detergent liquid forming process in which detergent is dissolved in washing dissolved water to form a high-concentration detergent liquid; A soaking process in which the above-mentioned high-concentration detergent liquid is diluted and spread and soaked in the laundry; A pre-washing process in which mechanical force is applied to the laundry after the above-mentioned soaking process; and After the above-mentioned pre-washing process, the necessary amount of water is supplied for washing, and the washing process is a washing process in which mechanical force acts on the washed clothes in the formed washing water. 2. A washing machine, after soaking the washing clothes in the washing and dehydrating cylinder in the high-concentration detergent liquid, then supplying water and carrying out the washing process in the washing machine, it is characterized in that it has the function of mechanical force acting on the above-mentioned washing It is also the stirring impeller on the laundry in the dehydration drum, and the control device for controlling the following various processes: A high-concentration detergent liquid forming process in which detergent is dissolved in washing dissolved water to form a high-concentration detergent liquid; A soaking process in which the above-mentioned high-concentration detergent liquid is diluted and spread and soaked in the laundry; A pre-washing process in which mechanical force is applied to the laundry after the above-mentioned soaking process; The water supply process of supplying the amount of water required for washing to the above-mentioned washing and dehydrating drum; and A washing process in which a mechanical force is applied to the laundry in the washing water formed in the above-mentioned water supply process; In addition, the control device rotates and agitates the laundry by moving the agitating impeller relative to the washing and dehydrating tub in the washing step. 3. The washing machine according to claim 2, wherein: The control device can perform the water supply process and the pre-washing process simultaneously. 4. The washing machine according to claim 2, wherein: There is a water supply valve for water supply in the washing and dehydration tub, and the control device can operate the water supply valve intermittently to keep the water supply flow rate constant when the water pressure of the tap water increases during the water supply process. 5. The washing machine according to claim 2, wherein: The control device can alternately perform the water supply process and the pre-washing process. 6. The washing machine according to claim 2, wherein: The control device can make the mechanical force acting on the laundry in the pre-washing step smaller than the mechanical force in the washing step. 7. The washing machine according to claim 2, wherein: It also has a driving device for driving the above-mentioned washing and dehydrating cylinder and the above-mentioned stirring impeller. The above-mentioned driving device is composed of a driving motor, a clutch mechanism and a speed reduction mechanism. The clutch mechanism has the following various operating modes: Stirring mode in which the above-mentioned agitating impeller is rotated under the state; the washing mode in which the above-mentioned washing and dehydrating cylinder and the above-mentioned agitating impeller are rotated in opposite directions respectively; ; The control device sets the clutch mechanism to a washing mode in the pre-washing step. 8. The washing machine according to claim 2, wherein: The outer diameter of the stirring impeller is 90% or more of the inner diameter of the washing and dehydrating tub.

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