JP4239789B2 - Washing machine - Google Patents

Description

  The present invention relates to a washing machine that performs washing, rinsing, and dewatering in a rotating drum having a rotation center axis in a substantially horizontal direction or a substantially inclined direction.

  Conventionally, this type of washing machine has a rotating drum that stores laundry and can rotate around a horizontal axis in a water receiving tub. Is started, the water drum is supplied to a predetermined water level, and then the rotating drum is driven. The laundry stored in the rotating drum by the rotation of the rotating drum is hooked on the stirring protrusion provided on the inner peripheral surface of the rotating drum, lifted in the rotating direction, and dropped from an appropriate height. Washing is done with the action of tapping.

  After this washing process, the washing water is drained, water is newly supplied and a rinsing process is executed. When the rinsing process is completed, a dehydration process is performed in which the rotating drum is rotated at a high speed. Each of these steps is executed based on a predetermined control procedure.

The above configuration is a general configuration of a washing machine having a rotating drum that can rotate around a horizontal axis. In addition to the above configuration, the water stored in the water receiving tub is rotated to improve the cleaning performance. There has been proposed a washing machine in which the washing power is increased by circulatingly supplying the drum and causing the laundry to sufficiently absorb water (for example, see Patent Document 1).
JP 09-215893 (pages 3 to 5, FIG. 1)

  However, such a conventional configuration requires a circulation pump to circulate and supply the water stored in the water receiving tank to the cleaning drum in order to improve the cleaning performance, which complicates the configuration and increases the cost. Had the problem of becoming.

  On the other hand, in order to improve the washing performance and shorten the washing time, as an effective means, a technique is known in which a detergent is dissolved in water and the washing performance is improved using a foamed high-concentration washing liquid.

  The present invention solves the above-described conventional problems, improves the cleaning performance using a foamed high-concentration laundry liquid, enables efficient generation of a high-concentration laundry liquid with a simple configuration, and It is intended to be able to operate safely without vibration and noise when a high-concentration laundry liquid is generated and permeated into the laundry.

Substantially for the present invention to achieve the above object, a water supply step for supplying water to detect a predetermined level lower than the water level to carry out the washing operation with water level detector you detect the level of the water receiving tank, a rotary drum cloth balance process to stick the from rest laundry raised to a first predetermined rotation speed in a rotating drum, a fabric balance determination step determines cloth balance state substantially at a first predetermined rotational speed, the fabric When it is determined that the balance is good in the balance determination process, the rotating drum is raised to the second predetermined rotation speed and maintained for a predetermined time , and the water flow of the washing liquid generated in the rotation direction of the rotating drum is generated by the wall portion. The pre-cleaning step of generating bubbles and adhering to the laundry in the rotating drum is sequentially performed.

  As a result, in the preliminary washing process, the washing performance can be improved by allowing the high-concentration washing liquid to permeate into the laundry in the rotating drum, and the high-concentration washing liquid that has been bubbled with a simple configuration can be improved. When the high-concentration washing liquid can be generated efficiently and penetrated into the laundry in the pre-cleaning process, the pre-cleaning process is performed only when the fabric balance is good, so there is no vibration or noise and it is safe. Can work.

  The washing machine of the present invention can improve washing performance by permeating the laundry in the rotating drum with the foamed high-concentration washing liquid in the preliminary washing process, and the high-concentration foamed with a simple configuration. When a high-concentration washing liquid is generated in the pre-cleaning process and penetrates into the laundry, the pre-cleaning process is performed only when the cloth balance is good. And can operate safely.

According to a first aspect of the present invention, there is provided a rotating drum having a rotation center axis in a substantially horizontal direction or a substantially inclined direction, a water receiving tub that is elastically supported by a washing machine body and encloses the rotating drum, and a lower portion of the inner surface of the water receiving tub A wall portion formed in a direction intersecting the rotation direction of the rotating drum, water supply means for supplying water into the water receiving tank, water level detecting means for detecting the water level in the water receiving tank, and driving the rotating drum An inverter having a switching element for supplying electric power to the motor, and a control means for controlling the driving of the motor by controlling the switching element of the inverter, wherein the control means is the water level detection means. a water supply step for supplying water to detect a predetermined level lower than the level for implementing the washing operation, the rotary drum from a substantially stationary state launched the first predetermined rotational speed laundry in the rotary drum Cloth balance process to stick, cloth balance determination step determines cloth balance state the first at a predetermined rotational speed substantially, the second predetermined rotational speed to the rotary drum and it is determined that a good balance in the laundry balance determining stroke A pre-washing step in which the washing liquid generated in the rotation direction of the rotating drum generates bubbles by turbulent flow generated by the wall and adheres to the laundry in the rotating drum. by the kite to perform successively, water containing water detergent in water receiving tank may flow is generated in the rotation direction of the rotary drum, the water flow wall portion formed in a direction crossing the direction of rotation of the rotating drum Turbulent flow is generated by the water, and the water in the water receiving tank contains a detergent in a small amount of water supply, so it becomes a highly concentrated washing liquid and foams vigorously. The foamed high concentration washing liquid is circulated from the water receiving tank. Enters the rotary drum through an opening of the drum, uniformly adheres to the laundry being agitated by the rotation of the rotary drum. Since the high-concentration detergent solution permeates into the laundry to which this high-concentration laundry solution has adhered, the washing performance in the washing operation after the preliminary washing process can be improved. A high-concentration washing liquid with a simple configuration can be efficiently generated, and when a high-concentration washing liquid is generated in the pre-cleaning process and penetrates into the laundry, the pre-cleaning is performed only when the cloth balance is good. Since the process is performed, there is no vibration and noise, and it can operate safely.

  According to a second invention, in the first invention, the control means supplies water while rotating the rotating drum at a third predetermined number of rotations in the water supply process, and the entire laundry is evenly washed. Therefore, it is possible to improve the balance of the laundry when the rotary drum is raised to the first rotation speed and the second rotation speed.

  In a third aspect based on the third aspect, the control means is configured such that the rotation direction of the rotating drum in the water supply stroke is opposite to the rotation direction of the rotating drum after the cloth balancing step. It is possible to suppress tangling of the cloth by rotating only in the direction, and to improve the balance of the laundry when the rotating drum is raised to the first rotation speed and the second rotation speed.

  In a fourth aspect based on the first aspect, when the control means determines that the cloth balance state is poor in the cloth balance determination step, the control means starts over from the cloth balance step, and the rotating drum is temporarily stopped. After the laundry is peeled off, the laundry balance can be changed by gradually sticking the laundry to the inner wall of the rotating drum again in the cloth balancing process. Since the pre-cleaning process in which the detergent solution of the concentration is permeated can be performed, abnormal vibrations of the rotating drum and the water receiving tank due to the unbalance of the laundry can be eliminated, and the safety of the product can be improved.

  According to a fifth aspect of the present invention, in the fourth aspect of the invention, the control means is configured not to perform the preliminary cleaning process when the number of times that the cloth balance state is determined to be bad in the cloth balance determination process reaches a predetermined number of times. As long as the balance state of the laundry is not improved even after performing the cloth balancing process a predetermined number of times, the subsequent cleaning process can be performed without performing the preliminary cleaning process, and the washing time becomes too long meaninglessly. This eliminates problems such as user dissatisfaction.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

  As shown in FIG. 2, the rotating drum 1 is formed in a bottomed cylindrical shape, and a large number of water passage holes 2 are provided on the entire surface of the rotating drum 1. The rotating drum 1 is rotatably disposed in the water receiving tank 3. A rotation axis (rotation center axis) 4 is provided at the rotation center of the rotary drum 1 in a substantially inclined direction, and the axial center direction of the rotary drum 1 is inclined downward from the front side toward the back side. A motor 5 attached to the back surface of the water receiving tank 3 is connected to the rotating shaft 4 to drive the rotating drum 1 to rotate in the forward and reverse directions. Several protruding plates 6 are provided on the inner wall surface of the rotating drum 1.

  The opening provided in the upward inclined surface on the front side of the water receiving tub 3 is covered with a lid 7 so that it can be opened and closed. By opening the lid 7, the laundry can be taken in and out of the rotary drum 1 through the clothing entrance 8. ing. Since the lid body 7 is provided on the upward inclined surface, the laundry can be carried out without bending the waist.

  The water receiving tub 3 is suspended from the washing machine main body 9 by a spring body (not shown) so as to be swingable. One end of the drainage passage 10 is connected to the lower portion of the water receiving tub 3 and the other end of the drainage passage 10 is connected to the water receiving tub 3. The washing water in the water receiving tank 3 is drained by connecting to the drain valve 11. The water supply valve 12 supplies water into the water receiving tank 3 through the water supply path 13.

  A drainage groove 14 is formed in the lowermost part of the water receiving tub 3 in a direction orthogonal to the rotation direction of the rotary drum 1, and the side wall (wall part) 14 a of the drainage groove 14 has a water flow as shown in FIG. It is formed in a direction that intersects the direction.

  In the present embodiment, the rotation shaft 4 is provided in a substantially inclined direction at the rotation center of the rotary drum 1 and the axial center direction of the rotary drum 1 is inclined downward from the front side to the back side. However, the rotating shaft 4 may be provided in the substantially horizontal direction at the rotation center of the rotating drum 1, and the axial center direction of the rotating drum 1 may be disposed in the substantially horizontal direction.

  The control device 15 is configured as shown in FIG. 1 and includes a microcomputer that controls operations of the motor 5, the drain valve 11, the water supply valve 12, and the like, and sequentially controls a series of steps of washing, rinsing, and dewatering. Control means 16 is provided. The control means 16 inputs information from the input setting means 17 for setting the driving course and the like, and displays the information on the display means 18 based on the information to inform the user, and starts the operation by the input setting means 17. Is set, the data from the water level detecting means 19 for detecting the water level in the water receiving tank 3 is input, and the operations of the drain valve 11 and the water supply valve 12 are controlled via the load driving means 20, Perform washing operation.

  At this time, the control means 16 controls the rotation of the motor 5 by controlling the inverter 23 via the drive circuit 22 based on the information from the position detection means 21 that detects the position of the rotor of the motor 5. Yes. Although the motor 5 is a direct current brushless motor, although not shown, it is composed of a stator having a three-phase winding and a rotor having a two-pole permanent magnet disposed on the ring, and the stator has a three-phase winding. The first winding 5a, the second winding 5b, and the third winding 5c to be configured are wound around an iron core provided with a slot.

  The inverter 23 is composed of a switching element composed of a parallel circuit of a power transistor (IGBT) and a reverse conducting diode. A series circuit of a first switching element 23a and a second switching element 23b, a series circuit of a third switching element 23c and a fourth switching element 23d, and a fifth switching element 23e and a sixth switching element 23f A series circuit is configured, and the series circuit of each switching element is connected in parallel.

  Here, both ends of the series circuit of the switching elements are input terminals, connected to a DC power source, and output terminals are respectively connected to connection points of two switching elements constituting the series circuit of the switching elements. The output terminal is connected to the U terminal, V terminal, and W terminal of the three-phase winding, and the U terminal, V terminal, and W terminal are connected by the on / off combination of two switching elements constituting the series circuit of the switching element. The three states are positive voltage, zero voltage, and release, respectively.

  On / off of the switching element is controlled by the control means 16 on the basis of information from the three position detection means 21a, 21b, and 21c made of the Hall IC. The position detection means 21a, 21b, and 21c are disposed on the stator so as to face the permanent magnets of the rotor at an electrical angle of 120 degrees.

  During one rotation of the rotor, the three position detecting means 21a, 21b, and 21c each output a pulse at an electrical angle of 120 degrees. The control means 16 detects when the signal state of any of the three position detection means 21a, 21b, 21c changes, and based on the signals of the position detection means 21a, 21b, 21c, the switching elements 23a-23f By changing the on / off state, the U terminal, the V terminal, and the W terminal are brought into three states of positive voltage, zero voltage, and release, and the first winding 5a, the second winding 5b, and the third winding of the stator. The coil 5c is energized to create a magnetic field and rotate the rotor.

  Further, the switching elements 23a, 23c, and 23e are each controlled by pulse width modulation (PWM), for example, by controlling the energization ratio of high and low at a repetition frequency of 10 kHz to control the rotational speed of the rotor, The control means 16 detects the cycle whenever the signal state of any of the three position detection means 21a, 21b, 21c changes, calculates the rotor rotation speed from the cycle, and sets the rotation speed to the set rotation speed. The switching elements 23a, 23c, and 23e are PWM-controlled.

  The torque detection means 24 comprises a resistor 25 connected to one input terminal of the inverter 23 and a current detection circuit 26 connected to the resistor 25, and detects the input current value of the inverter 23 and converts it into a voltage signal. The voltage signal is input to the control means 16. Further, the control means 16 performs A / D conversion on the input voltage signal and performs arithmetic processing as digital data. When the motor 5 is a direct current brushless motor, the torque is substantially proportional to the input current. Therefore, the torque of the motor 5 is detected by detecting the input current value of the inverter 23 by the current detection circuit 26 connected to the resistor 25. be able to.

The cloth amount detecting means 27 detects the amount of laundry in the rotating drum 1 and is rotated by a signal from the torque detecting means 24 when the rotating drum 1 is raised to a predetermined rotational speed (for example, 200 r / min). The amount of laundry in the drum 1 is detected.

  The commercial power source 28 is connected to the inverter 23 via a DC power source conversion device including a diode bridge 29, a choke coil 30, and a smoothing capacitor 31. However, this is an example, and the configuration of the DC brushless motor 5, the configuration of the inverter 23, and the like are not limited thereto.

  As shown in FIG. 4, the input setting means 17 includes a washing time setting switch 17a for setting the washing time, a rinsing frequency setting switch 17b for setting the rinsing frequency, a dehydration time setting switch 17c for setting the dehydration time, and a course setting switch 17d. , A start / pause switch 17e, a power-on switch 17f, a power-off switch 17g, etc., and the display means 18 includes a washing time display section 18a, a rinse count display section 18b, a dehydration time display section 18c, and a course setting display section 18d. And a detergent amount display portion 18e, a remaining time display portion 18f, a number display portion 18g, and the like.

  Here, the control means 16 supplies water until the water level detection means 19 detects a predetermined water level (for example, a water column of 100 mm) and the rotating drum 1 from a substantially stationary state to a first predetermined rotation speed (for example, 90 r / min) and a fabric balance determination step of determining a fabric balance state at a substantially first predetermined rotation speed, and a second predetermined rotation speed (for example, , 150 r / min), and a preliminary cleaning step of maintaining for a predetermined time is sequentially performed.

  Further, the control means 16 supplies the water while rotating the rotary drum 1 at a third predetermined rotation speed (for example, 35 r / min) in the water supply stroke, and changes the rotation direction of the rotary drum 1 in the water supply stroke after the cloth balance stroke. The direction of rotation of the rotating drum 1 is opposite to that of the rotating drum 1.

  In addition, when the control means 16 determines that the cloth balance state is bad in the cloth balance determination process, the control means 16 starts over from the cloth balance process, and the number of times determined that the cloth balance state is bad in the cloth balance determination process is a predetermined number of times (for example, 4 times), the preliminary cleaning process is not performed.

  The operation of the above configuration will be described with reference to FIG. The laundry is put into the rotating drum 1, the power-on switch 17f is turned on, the course setting switch 17d is used to select and input the operation course according to the type of laundry, and the start / pause switch 17e is turned on to operate. First, the control unit 16 rotates the rotary drum 1 and detects the amount of laundry in the rotary drum 1 by the cloth amount detection unit 27. Then, the detergent amount is displayed on the detergent amount display unit 18e and the number display unit 18g according to the detected amount of laundry. The displayed detergent amount is put into a detergent inlet (not shown) provided in the water supply path 13, and then the remaining time until the end is displayed on the remaining time display part 18f and the number display part 18g.

  Next, the washing process is started in step 100 of FIG. 5, and after the data is initialized (N = 1) in step 101, the motor 5 is driven in step 102 to rotate the rotary drum 1 to the third. While rotating in the reverse direction at a predetermined rotation speed (35 r / min), the water supply valve 12 is turned on in step 103, and water is supplied into the water receiving tank 3 while dissolving the detergent supplied from the detergent inlet through the water supply path 13.

At the same time, since the rotating drum 1 is rotating at the third predetermined number of rotations, the laundry in the rotating drum 1 is lifted in the rotating direction by the protruding plate 6 provided on the inner wall surface of the rotating drum 1. When it moves to a height position where its own weight is greater than the inertia and centrifugal force accompanying rotation, it falls onto the lower inner peripheral surface of the rotating drum 1. On the other hand, the water supplied into the water receiving tank 3 also enters the rotating drum 1 through a large number of water passage holes 2 provided on the outer peripheral portion of the rotating drum 1. Therefore, the laundry that is repeatedly lifted and dropped by the rotating drum 1 that rotates at the third predetermined number of revolutions is repeatedly wetted with water when dropped.

  Next, when the water level detected by the water level detection means 19 at step 104 reaches a predetermined water level (water column 100 mm), the routine proceeds to step 105 where the water supply valve 12 is turned off to stop water supply and the rotating drum 1 is stopped. The predetermined water level at this time is a water level lower than the water level at which the washing operation is performed.

  Thereafter, in step 106, the balance stroke is entered, and the rotating drum 1 is rotated forward to start up from the substantially stationary state to the first predetermined rotation speed (90 r / min), and the laundry is stuck in the rotating drum 1. That is, by rotating the rotating drum 1 gradually from a substantially stationary state to a first predetermined rotational speed (90 r / min), the laundry is rotated so that the centrifugal force is greater than the gravity acting on the laundry. Stick in the drum 1. For example, after the rotational speed of the rotating drum 1 is controlled to be constant at 35 r / min for the first 5 seconds, the rotational speed of the rotating drum 1 is controlled to 90 r / min by accelerating by 3 r / min per second.

  Subsequently, in the cloth balance determination process in step 107, the balance state of the laundry in the rotary drum 1 is determined at approximately the first predetermined rotation speed (90 r / min). That is, the rotation speed variation is measured with the voltage applied to the motor 5 fixed so that the rotation speed of the rotating drum 1 can be kept constant at 90 r / min, and when the rotation speed fluctuation is large, the laundry is stuck. It is determined that the balance is bad.

  If it is determined in step 107 that the balance state is poor, the rotary drum 1 is stopped in step 109 through step 108, 1 is added to N in step 110, and the flow returns to step 106 to start over from the cloth balancing process. The operations from Step 106 to Step 110 are repeated. Here, when the number of times that the cloth balance state is determined to be bad in the cloth balance determination process reaches a predetermined number (4 times), that is, when N = 4 in Step 108, the process proceeds to Step 114, and the rotary drum 1 is stopped. And avoid the pre-cleaning process.

  If it is determined in step 107 that the balance state is good, the preliminary cleaning process is started, the rotational speed of the rotary drum 1 is increased to a second predetermined rotational speed (150 r / min) in step 111, and a timer is processed in step 112. 1 is cleared and maintained at step 113 for a predetermined time (1 minute).

  In the preliminary washing process, water is supplied into the water receiving tank 2 to a predetermined water level lower than the water level at which the washing operation is performed, and the rotating drum 1 is rotated at the second predetermined rotation speed (150 r / min). The washing liquid containing the detergent supplied therein generates a water flow in the rotation direction of the rotary drum 1. This water flow generates a turbulent flow by the wall portion 14a formed in a direction intersecting the rotation direction of the rotary drum 1, and the water in the water receiving tub 3 contains a detergent in a small amount of water supply, so that it becomes a high concentration washing liquid. Because it is, it will be in a state of violent bubbles.

  In general, detergent molecules consist of hydrophilic groups and lipophilic groups. In washing liquids that dissolve in water, latent molecules are aligned at the interface (water surface), and detergent molecules that cannot be arranged are present individually or as micelles (groups) in water. To do. As soon as the interfacial detergent molecules are removed, the detergent molecules in the water move to the interface and are replenished. When bubbles generated by turbulent flow are sent to the washing liquid, the bubbles rise and reach the interface, and bubbles in a form in which detergent molecules aligned with the interface are held in the bubble film as they are are generated. Since the foam has as many detergent molecules as possible, the detergent concentration is also high. Since the detergent molecules in the liquid move to replenish the detergent molecules removed as bubbles, bubbles are created one after another when bubbles are sent one after another.

  The foam generated in large quantities fills and rises in the water tub 3 together with the high-concentration washing liquid, and enters the rotary drum 1 one after another from the open front side opening and adheres to the laundry. The laundry is in a state of being stuck on the inner peripheral surface of the rotating drum 1 that rotates at the second predetermined number of rotations. Adhere to things. The laundry is in a state of being evenly wetted by the rotation of the rotary drum 1 at the third predetermined rotation speed (35 r / min), and the laundry becomes wet when a high-concentration washing liquid adheres to the laundry. It becomes easy for detergent components to penetrate inside.

  When the foamed high-concentration washing liquid permeates the surface or the inside of the soiled laundry, the lipophilic group is bonded to the oil soil and the particle soil adhered to the oil and carried away. Also, if the foamed high-concentration washing liquid breaks through the laundry, the high-concentration washing liquid will soak into the laundry, making it easy to remove dirt, allowing the laundry to be washed. It becomes. By adhering and penetrating the high-concentration washing liquid thus foamed into the laundry in the rotating drum 1, the detergent component easily acts on the dirt, and the high-concentration washing liquid is easily infiltrated and uneven washing is suppressed. The washing time can be improved and the washing time can be shortened.

  When a predetermined time (1 minute) elapses in step 113, the process proceeds to step 114, the rotation of the rotary drum 1 is stopped, and the process proceeds to the next process in step 115.

  As described above, in the present embodiment, the control unit 16 sets the water supply stroke for supplying water until the predetermined water level is detected by the water level detection unit 19 and the rotary drum 1 from the substantially stationary state to the first predetermined rotation speed. The cloth balance process for raising and laminating the laundry in the rotating drum 1, the cloth balance determining process for determining the cloth balance state at approximately the first predetermined rotation speed, and the second predetermined rotation speed for raising the predetermined time Since the preliminary washing process to be maintained is performed sequentially, the washing performance can be improved by allowing the high-concentration washing liquid to permeate into the laundry in the rotating drum in the preliminary washing process. A simple construction in which a wall portion 14a is formed in a direction intersecting with the rotation direction of the rotary drum 1 at the lower inner surface of the tank 3 can efficiently produce a high-concentration washing liquid and is highly effective in a preliminary cleaning process. concentration When infiltrating produce the washing solution was laundry, since the pre-cleaning step only if the cloth balance is good, vibrations, no noise can operate safely.

  Further, since the control means 16 supplies the water while rotating the rotary drum 1 at the third predetermined number of rotations in the water supply stroke, the entire laundry is uniformly wetted with the washing liquid. It is possible to improve the balance of the laundry when starting up at the first rotation speed and the second rotation speed.

  Further, since the rotation direction of the rotary drum 1 in the water supply stroke is set to be opposite to the rotation direction of the rotary drum 1 after the cloth balancing stroke, the control means 16 picks up the cloth from the laundry by rotating the laundry in only one direction. Therefore, it is possible to improve the balance of the laundry when the rotary drum 1 is raised to the first rotation speed and the second rotation speed.

  In addition, when the control means 16 determines that the cloth balance state is bad in the cloth balance determination process, the control means 16 restarts the cloth balance process. The cloth balance state can be changed by gradually sticking the laundry to the inner wall of the rotating drum in the cloth balance process, and only when the cloth balance is good, a pre-cleaning process that allows the detergent to permeate the laundry at a high concentration is performed. Therefore, the abnormal vibration of the rotating drum 1 and the water receiving tub 3 due to the unbalance of the laundry can be eliminated, and the safety of the product can be improved.

  Further, the control means 16 does not perform the preliminary washing process when the number of times that the cloth balance state is determined to be bad in the cloth balance determination process reaches a predetermined number of times. Only when the balance state is not improved, the subsequent cleaning process can be performed without performing the preliminary cleaning process, and the problem that the user feels dissatisfied because the washing time becomes meaninglessly long is eliminated. be able to.

  In addition, in this Embodiment, although it does not have a drying function which dries the laundry in the rotating drum 1, you may make it have a function which blows and dries warm air in the water receiving tank 3, Similar actions and effects can be obtained.

  The washing machine according to the present invention can improve washing performance by impregnating the laundry in the rotating drum with a high-concentration washing liquid in the preliminary washing process, and can also improve the washing performance with a simple configuration. When the washing liquid with high concentration can be efficiently generated and the washing liquid with high concentration is generated in the pre-washing process and penetrated into the laundry, the pre-washing process is performed only when the cloth balance is good. Since there is no noise and it can operate safely, it is useful as a washing machine for washing, rinsing and dewatering in a rotating drum having a rotation center axis in a substantially horizontal direction or a substantially inclined direction.

FIG. 1 is a partial block diagram of a washing machine of an embodiment of the present invention Longitudinal section of the washing machine Cross section of the main part of the washing machine Enlarged front view of input setting means and display means of the washing machine Operation flowchart of the washing machine

Explanation of symbols

1 Rotating drum 3 Water receiving tank 4 Rotating axis (Rotating center axis)
5 Motor 9 Washing machine body 12 Water supply valve (water supply means)
14a Side wall (wall) of drainage groove
16 Control means 19 Water level detection means 23 Inverter 23a-23f Switching element

Claims (5)

A rotating drum having a rotation center axis in a substantially horizontal direction or a substantially inclined direction, a water receiving tank elastically supported by a washing machine body and enclosing the rotating drum, and rotation of the rotating drum at the lower part of the inner surface of the water receiving tank A wall formed in a direction crossing the direction, water supply means for supplying water into the water receiving tank, water level detecting means for detecting the water level in the water receiving tank, a motor for driving the rotating drum, and the motor And an inverter having a switching element for supplying power to the inverter, and a control means for controlling the drive of the motor by controlling the switching element of the inverter, the control means performing a washing operation with the water level detection means a water supply step for supplying water to detect a lower predetermined level, to stick the laundry in the rotary drum the rotary drum from a substantially stationary state launched the first predetermined rotational speed Balance process, a cloth balance determination step determines cloth balance state the first at a predetermined rotational speed substantially, the rotary drum and it is determined that a good balance in the laundry balance determining stroke raised to a second predetermined rotational speed A pre-washing process is performed in which the washing liquid generated in the rotating direction of the rotating drum is maintained for a predetermined time, and bubbles are generated by the turbulent flow generated by the wall portion to adhere to the laundry in the rotating drum. Washing machine. The washing machine according to claim 1, wherein the control means supplies water while rotating the rotating drum at a third predetermined number of rotations in a water supply process. The washing machine according to claim 2, wherein the control means sets the rotation direction of the rotary drum in the water supply stroke to be opposite to the rotation direction of the rotary drum after the cloth balance stroke. The washing machine according to claim 1, wherein the control means starts over from the cloth balance process when it is determined that the cloth balance state is bad in the cloth balance determination process. The washing machine according to claim 4, wherein the control means does not perform the preliminary washing process when the number of times that the cloth balance state is determined to be bad in the cloth balance determination process reaches a predetermined number.

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