JP4300967B2 - Washing machine - Google Patents

Description

  The present invention relates to a washing machine for supplying water to a predetermined water level and washing it in a water receiving tank containing a rotating drum.

  Conventionally, this type of washing machine is configured as shown in FIGS. Hereinafter, the configuration will be described.

  As shown in FIGS. 8 and 9, the rotating drum 81 is provided with a large number of water passage holes 82 on the entire outer periphery thereof and is rotatably disposed in the water receiving tank 83. A rotating shaft 84 is provided in a substantially horizontal direction at the rotation center of the rotating drum 81, and a motor 85 is connected to the rotating shaft 84 to rotate the rotating drum 81. Several protruding plates 86 are provided on the inner wall surface of the rotating drum 81.

  The water receiving tub 83 is suspended from the washing machine main body 87 so as to be swingable by a spring body 88. One end of a drain hose 89 is connected to the lower part of the water receiving tub 83, and the other end of the hose 89 is connected to the drain pump 90. The washing water in the water receiving tank 83 is drained by connection. The water supply valve 91 supplies water into the water receiving tank 83. The water level detection means 92 detects the water level in the water receiving tank 83.

  The control device 93 has a control means 94 constituted by a microcomputer, and controls the operation of the motor 85, the drainage pump 90, the water supply valve 91, etc. via the power switching means 95, and a series of washing, rinsing, dehydration and the like. Control the process sequentially. The input setting means 96 sets a driving course and the like. The control means 94 inputs information from the input setting means 96 and displays a display means 97 based on the information to notify the user. The storage means 98 stores data necessary for control by the control means 94. In addition, 99 is a commercial power source, 100 is a power switch (for example, refer patent document 1).

  The operation of the washing process in the above configuration will be described. When the laundry and the detergent are put into the rotating drum 81, the power source and the start button (not shown) are pressed, and the washing process is started, the water supply valve 91 operates to supply water. When the predetermined water level N1 is detected by the water level detection means 92, the operation of the water supply valve 91 is stopped and the motor 85 is driven. Further, when a predetermined water level N2 (equal to or higher than N1) is detected, water supply is stopped.

In the washing process, since the laundry contains water, the rotating drum 81 is driven to rotate forward, stop, reverse, and stop at a predetermined number of rotations and a predetermined time by the motor 85 while supplying water. The laundry is caught by the protruding plate 86, lifted, and dropped onto the water surface. By this operation, the detergent is gradually dissolved to become washing water, which acts on the dirt of the laundry. When the washing process is completed, the drainage pump 90 is operated to drain the washing water in the water receiving tub 83.
JP-A-10-272284

  In such a conventional configuration, when water is supplied, when the predetermined water level N1 is detected by the water level detecting means 92 and the operation of the water supply valve is stopped, the laundry put into the rotary drum 81 contains the supplied water. In this state, when the motor 85 is driven and the rotating drum 81 is rotated, the laundry in the rotating drum 81 sucks the water in the rotating drum 81, and the water level detected by the water level detecting means 92 decreases. There was a problem that the replenishing water to be supplied by stopping the motor 85 was frequently used.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and it is an object of the present invention to make it easier to suck water into the laundry in the rotating drum at the time of water supply, reduce the amount of makeup water after the end of water supply, and improve the water level detection accuracy. .

In order to achieve the above object, the present invention encloses a rotating drum having a rotation center axis in a substantially horizontal direction or a substantially inclined direction in a water receiving tank, and drives the rotating drum by a motor to supply water into the water receiving tank The water level in the water receiving tank is detected by the water level detection means, and the motor and the water supply means are controlled by the control means for inputting the output of the water level detection means . Is supplied while rotating at a rotational speed that sticks to the inner wall of the rotating drum, and the water level is detected every first predetermined time by the water level detecting means during the rotation of the rotating drum, which is an integral multiple of the rotation period of the rotating drum. A moving average of the water level is calculated every second predetermined time, and the calculated moving average value is used as the water level in the water receiving tank.

  As a result, by driving the rotating drum when water is supplied, water can be easily sucked into the laundry in the rotating drum, and the amount of makeup water after the water supply is completed can be reduced. The water level can be detected.

  The washing machine of the present invention can easily suck water into the laundry in the rotating drum at the time of water supply, can reduce the replenishing water after the water supply is completed, and can detect the water level accurately even when the rotating drum is rotating. be able to.

A first invention is a rotating drum having a rotation center axis in a substantially horizontal direction or a substantially inclined direction, a water receiving tank containing the rotating drum, a motor for driving the rotating drum, and water supply in the water receiving tank. Water supply means, water level detection means for detecting the water level in the water receiving tank, and control means for inputting the output of the water level detection means and controlling the motor and water supply means, the control means comprising the rotation Water is supplied while rotating the drum at a rotational speed at which the laundry sticks to the inner wall of the rotating drum, and the water level is detected by the water level detecting means during the first predetermined time while the rotating drum is rotating. a moving average of the water level calculated for each second predetermined time is an integer multiple of the rotation period, is in the calculated moving average value obtained by the water level of the water receiving tank, the laundry rotating drum rotate in the water at By driving at a rotational speed that sticks to the inner wall of the ram (for example, 100 r / min), water is supplied while rotating the laundry while sticking to the inner wall of the rotating drum, so it is easy to suck water into the laundry in the rotating drum. Yes, when the water supply is completed, the laundry can be uniformly sucked into the laundry, the amount of makeup water after the water supply ends can be reduced, and the amount of water suitable for the amount of laundry can be quickly supplied. The washing time can be shortened, the washing liquid can be applied to the laundry, and the washing performance can be improved. Even if the rotating drum is rotating, the first predetermined time can be obtained. By detecting the water level every time, and making the moving average value obtained every second predetermined time as the water level in the water receiving tank, the fluctuation of the water level due to the rotation of the rotating drum can be removed, Accurate Position can be detected.

According to a second invention, in the first invention, the control means detects the water level by the water level detection means after the third predetermined time has elapsed when the motor is started, and the rotating drum is rotating. When the water level is detected, the fluctuation of the water level due to the rotation of the rotating drum is large when the motor is started, that is, when the rotating drum is started. Therefore, the water level detection accuracy can be improved by removing this.

According to a third aspect of the present invention, in the first or second aspect of the invention, the control means is configured so that the water level is not detected by the water level detection means when the motor is stopped. Since water contained in the laundry comes out at the time of stoppage, the water level detected by the water level detection means becomes high, and this increased water level becomes an error with respect to the water level during rotation of the rotating drum. The water level detection accuracy can be improved by not detecting the water level when rising due to the contained water.

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

(Embodiment 1)
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 is connected to the rotary shaft 4 to drive the rotary 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 water receiving tank 3 is suspended from the washing machine body 7 by a spring body 8 so as to be swingable. One end of the drain hose 9 is connected to the lower part of the water receiving tank 3 and the other end of the drain hose 9 is connected to the drain pump 10. The washing water in the water receiving tub 3 is connected and drained. A water supply valve (water supply means) 11 supplies water into the water receiving tank 3. The water level detection means 12 detects the water level in the water receiving tank 3.

  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 water level detection means 12 has a tire diaphragm that moves up and down by pressure from an air trap (not shown) provided in the water receiving tank 3. A ferrite core is installed on the diaphragm, and the inductance is generated by the movement of the ferrite core. A changing coil is provided, and an LC oscillation circuit using a CMOS inverter is configured using this coil, and the water level in the water receiving tank 3 is detected by a change in the oscillation frequency of the LC oscillation circuit due to a change in inductance due to the movement of the ferrite core. is doing.

  As shown in FIG. 1, the control device 13 controls the operation of the motor 5, the drain pump 10, the water supply valve 11, etc., and the control means 14 comprising a microcomputer that sequentially controls a series of processes such as washing, rinsing and dehydration. Etc. The control means 14 inputs information from the input setting means 15 for setting the driving course and the like, and displays the information on the display means 16 based on the information to notify the user, and starts the operation by the input setting means 15. Is set, the data from the water level detection means 12 and the like are input, and the washing operation is performed by controlling the operations of the drainage pump 10 and the water supply valve 11 via the load driving means 17.

  At this time, the rotation control means 18 controls the rotation of the motor 5 by controlling the inverter 21 via the drive circuit 20 based on information from the position detection means 19 that detects the position of the rotor of the motor 5. ing. 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 21 is constituted by a switching element (switching means) composed of a parallel circuit of a power transistor (IGBT) and a reverse conducting diode. A series circuit of a first switching element 21a and a second switching element 21b, a series circuit of a third switching element 21c and a fourth switching element 21d, and a fifth switching element 21e and a sixth switching element 21f 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 rotation control means 18 based on information from the three position detection means 19a, 19b, 19c made of the Hall IC. The position detection means 19a, 19b, 19c are arranged 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 19a, 19b, 19c each output a pulse at an electrical angle of 120 degrees. The rotation control means 18 detects when the signal state of any of the three position detection means 19a, 19b, 19c changes, and based on the signals of the position detection means 19a, 19b, 19c, the switching elements 21a-21f 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, The third winding 5c is energized to create a magnetic field and rotate the rotor.

  The switching elements 21a, 21c, and 21e are each controlled by pulse width modulation (PWM). For example, the rotational speed of the rotor is controlled by controlling the energization ratio of high and low at a repetition frequency of 10 kHz. The rotation control means 18 detects the period each time the signal state of any of the three position detection means 19a, 19b, 19c changes, calculates the rotor speed from that period, and sets it to the set speed. In addition, the switching elements 21a, 21c, and 21e are PWM-controlled.

  The resistor 22 detects current, and the input current value of the inverter 21 is detected by the voltage across the resistor 22. The commercial power source 23 is connected to the inverter 21 via a DC power source conversion device including a diode bridge 24, a choke coil 25, and a smoothing capacitor 26. However, this is an example, and the configuration of the DC brushless motor 5, the configuration of the inverter 21, and the like are not limited thereto.

  Here, when supplying water into the water receiving tub 3 by the water supply valve 11, the control means 14 drives the rotating drum 1 at a rotation speed (for example, 100 r / min) at which the laundry sticks to the inner wall of the rotating drum 1, and rotates. While the drum 1 is rotating, the water level detecting means 12 detects the water level every first predetermined time (for example, 0.3 seconds), and the moving average obtained every second predetermined time (for example, 1.2 seconds). The value is detected as the water level in the water receiving tank 3.

  At this time, the second predetermined time (1.2 seconds) is an integral multiple (2 times) of the rotation cycle of the rotary drum 1 (rotation cycle when the rotary drum 1 is rotated at 100 r / min is 0.6 seconds). ).

  The operation of the washing process in the above configuration will be described with reference to FIGS. When the laundry is put into the rotating drum 1, the detergent is put in a detergent case (not shown), and the washing process is started in step 31 of FIG. 3, the control means 14 moves the rotating drum 1 to the right in step 32. The laundry is driven at a rotation speed (100 r / min) that sticks to the inner wall of the rotating drum 1, the water supply valve 11 is operated in step 33 to start water supply, passes through the detergent case, and is supplied to the water receiving tub 3 together with the detergent. To do.

In step 34, a counter n (not shown) in the control means 14 is set to 0, and in step 35, a timer A (not shown) in the control means 14 is started. First in step 36
In step 37, the timer A is cleared and returned to 0 if 0.3 seconds have elapsed. In step 38, the timer A is started again, and in step 39, the water level Hn of the water supplied into the water receiving tank 3 by the water level detecting means 12 is measured.

  Here, the change in the water level in the water receiving tank 3 will be described. If the water receiving tank 3 is continuously supplied with water, the water level gradually increases, the inductance of the coil constituting the water level detection means 12 increases, and the water level frequency (the oscillation frequency of the LC oscillation circuit constituting the water level detection means 12) is Decrease gradually. When the water level rises, the water comes into contact with the outer peripheral portion of the rotating drum 1 rotating at 100 r / min in the water receiving tank 3. A large number of water passage holes 2 are provided on the entire surface of the outer periphery of the rotating drum 1, and when water is further supplied, water enters the rotating drum 1 through the water passage holes 2.

  Since water starts to come into contact with the outer peripheral portion of the rotating drum 1, the water surface is fluctuated up and down because it is repeatedly scraped up by the outer peripheral portion of the rotating rotating drum 1 and dropped due to the gravity of the water itself. The water level frequency fw varies as shown in FIG. 4, and the water level Hn detected by the water level detection means 12 varies vertically. For this reason, detection variation increases due to the influence of the water level fluctuation. Therefore, by obtaining the moving average value fi of the water level frequency fw, the moving average value of the water level Hn is obtained, and the water level detection with little influence of the water level fluctuation is performed.

  In step 40, it is determined whether the counter n is 3 or more. When the counter n is less than 3, the counter n is incremented by 1 at step 41 and counted up. If the counter n is 3 or more at step 40, a moving average value of four data of the water level Hn is calculated at step 42.

By repeating step 36 to step 41, the water level Hn is detected every 0.3 seconds from the start of water supply, the water level H ₀ after 0.3 seconds, the water level H ₁ after 0.6 seconds, 0.9 seconds later The water level H ₃ becomes the water level H ₄ after 1.2 seconds. In step 42, the moving average value In of the four data of the water level Hn is calculated by the following equation.

_{In = (H n + H n} -1 + H n-2 + H n-3) / 4
For example, the moving average value I ₃ of the water level after 1.2 seconds is
I ₃ = (H ₃ + H ₂ + H ₁ + H ₀ ) / 4
The moving average value I ₄ of the water level after 1.5 seconds is
I ₄ = (H ₄ + H ₃ + H ₂ + H ₁ ) / 4
It becomes. Thus, in this embodiment, the water level Hn is detected every first predetermined time (0.3 seconds) T1, and the moving average value during the second predetermined time (1.2 seconds) T2 is calculated. The effect of fluctuations in water level can be reduced.

  The time for obtaining the moving average value is 1.2 seconds. When the rotating drum 1 is rotated at 100 r / min, the rotation period of the rotating drum 1 is 0.6 seconds. Since it is almost the same as the cycle (the time for water to be dropped by gravity after being swung up by the rotary drum 1), the water level can be calculated by calculating the moving average at a cycle of 0.6 seconds or more. This is because the influence of fluctuation is reduced. In the present embodiment, the target water level is detected by a moving average of 1.2 seconds that is twice (integer multiple) 0.6 seconds (the rotation period of the rotating drum 1).

  If the moving average In of the water level is 38.5 kHz or less (corresponding to the target water level 115 mm) in step 43, the water supply is stopped in step 44. If the moving average In of the water level is 38.5 kHz or more (not reaching the target water level 115 mm), the water supply is continued, the counter n is counted up in step 41, and the steps 36 to 43 are repeated.

If two minutes have elapsed from the start of rotation of the rotating drum 1 in step 45, the rotating drum 1 is stopped in step 46, and the process proceeds to the next step of step 47 (stirring step of rotating the rotating drum 1 at 35 r / min). If two minutes have not elapsed, the rotating drum 1 continues to rotate until it elapses.

  As described above, in the present embodiment, the control unit 14 detects the water level every first predetermined time (0.3 seconds) by the water level detection unit 12 while the rotary drum 1 is rotating, and the second level Since the moving average value obtained every predetermined time (1.2 seconds) is the water level in the water receiving tub 3, the rotating drum 1 is rotated at the number of rotations (100 r / min) at which the laundry is stuck to the inner wall of the rotating drum when water is supplied. By driving, water is supplied while rotating while the laundry is stuck to the inner wall of the rotating drum 1, so that it is easy to suck water into the laundry in the rotating drum 1, and when the water supply is finished, the laundry is universal. Water can be sucked in, and the amount of makeup water after the end of water supply can be reduced, the amount of water suitable for the amount of laundry can be quickly supplied, washing time can be shortened and washing Let the washing liquid act on things In addition, the cleaning performance can be improved, and even when the rotating drum 1 is rotating, the moving average value obtained every second predetermined time by detecting the water level every first predetermined time. By setting the water level in the water receiving tank, fluctuations in the water level due to the rotation of the rotary drum 1 can be removed, and the water level can be detected with high accuracy.

  In addition, since the second predetermined time (1.2 seconds) is an integral multiple of the rotation period (0.6 seconds) of the rotating drum 1, the second predetermined time is an integral multiple of the rotation period of the rotating drum 1. Therefore, by obtaining the moving average value of the water level every second predetermined time, the fluctuation of the water level due to the rotation of the rotating drum 1 can be removed, and the water level can be detected accurately. it can.

(Embodiment 2)
The control means 14 shown in FIG. 1 supplies water to a predetermined water level in the water receiving tank 3 and then enters a stirring process, and drives the motor 5 to rotate the rotating drum 1 to the right at 35 r / min for 13 seconds. After that, the operation is stopped for 2 seconds, and the operation of rotating to the left at 35 r / min for 13 seconds and then stopping for 2 seconds is repeated. Here, when the motor 5 is started, the water level is detected by the water level detection means 12 after a third predetermined time (for example, 2 seconds) has elapsed, and when the motor 5 is stopped, the water level is not detected by the water level detection means 12. I am doing so. Other configurations are the same as those of the first embodiment.

  The operation of the washing process in the above configuration will be described with reference to FIGS. The operation from step 34 to step 42 is the same as the operation of the first embodiment, and a description thereof will be omitted.

  When the agitation process is started in step 51 of FIG. 5, the control means 14 starts the timer B in step 52, drives the rotating drum 1 to the right at 35 r / min in step 53, and in step 54 for a third predetermined time. It is determined whether (2 seconds) has passed. If 2 seconds have passed, the counter n (not shown) in the control means 14 is set to 0 in step 34, and the water level Hn is moved from step 34 to step 42. Find the average value.

  Here, when the motor 5 is started, that is, when the rotary drum 1 is started, as shown in FIG. 7, the fluctuation of the water level due to the rotation of the rotary drum 1 is large, so the third predetermined time (2 seconds) T3. By detecting the water level after the passage, it can be removed and the water level detection accuracy can be improved.

  In step 55, it is determined whether or not it is within 13 seconds. If it is within 13 seconds, if the moving average In of the water level Hn is 38.5 kHz or less in step 56, the counter n is incremented in step 41, and steps 36 to 42 are performed. Steps 55 and 56 are repeated. If the moving average In of the water level Hn is 38.5 kHz or more in step 56, the process proceeds to step 57 and makeup water is started.

  When 13 seconds elapse in step 55, the process proceeds to step 58 in FIG. 6 and the rotating drum 1 is stopped for 2 seconds. When the rotary drum 1 is stopped, water contained in the laundry comes out, so that the water level detected by the water level detection means 12 is high (the water level frequency is low as shown in FIG. 7). Since it becomes an error with respect to the water level when the drum 1 rotates, the water level detection accuracy can be improved by not detecting the water level when the rotating drum 1 is raised by the water contained in the laundry when the rotating drum 1 is stopped. it can.

  When 2 seconds elapses in step 58, the process proceeds to step 59, where the control means 14 drives the rotary drum 1 to the left at 35 r / min, and determines in step 60 whether a third predetermined time (2 seconds) has elapsed. If seconds have elapsed, a moving average value of the water level Hn is obtained in steps 34 to 42.

  In step 61, it is determined whether or not it is within 13 seconds. If it is within 13 seconds, if the moving average In of the water level Hn is 38.5 kHz or less in step 62, the counter n is incremented in step 41, and steps 36 to 42 are performed. , Steps 61 and 62 are repeated. In step 62, if the moving average In of the water level Hn is 38.5 kHz or more, the process proceeds to step 63 and makeup water is started.

  When 13 seconds elapse in step 61, the process proceeds to step 64, where the rotary drum 1 is stopped for 2 seconds. In step 65, it is determined whether the washing time of 15 minutes has elapsed, and if 15 minutes have not elapsed, the process proceeds to step 53 in FIG. Returning, the above operation is repeated, and if 15 minutes have elapsed, the process proceeds to step 66, the timer B is cleared, and the process proceeds to the next step of step 67.

  When makeup water is started in step 57 in FIG. 5, a moving average value of the water level Hn is obtained in steps 34 to 42. In step 68, it is determined whether or not it is within 13 seconds. If within 13 seconds, if the moving average In of the water level Hn is 38.5 kHz or more in step 69, the counter n is incremented in step 41, and steps 36 to 42 are performed. , Steps 68 and 69 are repeated. If the moving average In of the water level Hn is 38.5 kHz or less in Step 69, the process proceeds to Step 70, the makeup water is stopped, and the process returns to Step 34 after Step 54.

  When makeup water is started in step 63, a moving average value of the water level Hn is obtained in steps 34 to 42. In step 71, it is determined whether or not it is within 13 seconds. If it is within 13 seconds, if the moving average In of the water level Hn is 38.5 kHz or more in step 72, the counter n is incremented in step 41, and steps 36 to 42 are performed. Steps 71 and 72 are repeated. If the moving average In of the water level Hn is 38.5 kHz or less at step 72, the process proceeds to step 73, the makeup water is stopped, and the process returns to step 34 after step 60.

  As described above, in the present embodiment, the control means 14 detects the water level by the water level detection means 12 after the third predetermined time (2 seconds) has elapsed when the motor 5 is started. When the water level is detected while the drum 1 is rotating, when the motor 5 is activated, that is, when the rotating drum 1 is activated, the water level is greatly changed due to the rotation of the rotating drum 1, and thus the water level is detected by removing this. Accuracy can be improved.

  Further, since the control means 14 does not detect the water level by the water level detection means 12 when the motor 5 is stopped, the water contained in the laundry is discharged when the motor 5 is stopped, that is, when the rotary drum 1 is stopped. Therefore, the water level detected by the water level detection means 12 becomes higher, and this increased water level becomes an error with respect to the water level at the time of rotation of the rotary drum 1, so that the water level when the water level rises due to the water contained in the laundry. By not detecting the water level, the water level detection accuracy can be improved.

  The washing machine according to the present invention can easily suck water into the laundry in the rotating drum at the time of water supply, can reduce the replenishment water after the water supply is completed, and can accurately detect the water level even when the rotating drum is rotating. Therefore, it is useful as a washing machine for supplying water to a predetermined water level in a water receiving tank containing a rotating drum and washing it.

FIG. 2 is a partial block diagram of the washing machine according to the first embodiment of the present invention. Cross section of the washing machine Flowchart of water washing operation in the washing machine Time chart showing changes in water level frequency when water is supplied during the washing process of the washing machine Operation flowchart of washing process of washing machine of embodiment 2 of the present invention Operation flow chart following FIG. 5 of the washing process of the washing machine Time chart showing changes in water level frequency during the washing process of the washing machine Cross section of a conventional washing machine Block diagram of a conventional washing machine

Explanation of symbols

1 Rotating drum 3 Water receiving tank 4 Rotating axis (Rotating center axis)
5 Motor 11 Water supply valve (Water supply means)
12 Water level detection means 13 Control means

Claims (3)

A rotating drum having a rotation center axis in a substantially horizontal direction or a substantially inclined direction, a water receiving tank containing the rotating drum, a motor for driving the rotating drum, a water supply means for supplying water into the water receiving tank, A water level detecting means for detecting a water level in the water receiving tank; and a control means for controlling the motor and the water supply means by inputting an output of the water level detecting means, wherein the control means is configured such that the rotating drum is the laundry. While supplying water while rotating at a rotation speed that sticks to the inner wall of the rotating drum, the water level detecting means detects the water level at every first predetermined time while the rotating drum is rotating, and is an integral multiple of the rotation period of the rotating drum. there second moving average water level calculated for each predetermined time, washing machine and the water level of the water receiving tank to calculate the moving average. Control means, when starting the motor, the washing machine according to claim 1, wherein which is adapted to detect the water level by the third water level detection means after the predetermined time has elapsed. The washing machine according to claim 1 or 2 , wherein the control means does not detect the water level by the water level detection means when the motor is stopped .

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