JP2011055925A - Drum type washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress noise and vibrations during intermediate dewatering; to save energy; and to improve a laundry rinsing performance. <P>SOLUTION: In a rinsing process, rinsing is performed for two or more times, and intermediate dewatering is performed before rinsing. In the intermediate dewatering, a rotary drum 1 is rotated at a plurality of different steady speeds of rotation and the highest speed of rotation set higher than the plurality of steady speeds of rotation, and the time of driving the rotary drum at the highest speed of rotation is set to be shorter than the sum of the time of driving it at the plurality of steady speed of rotations. Thus, the noise and vibrations during the intermediate dewatering are suppressed, the energy is saved, and the laundry rinsing performance is improved. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a drum-type washing machine in which laundry is put into a rotating drum, and washing is performed by sequentially controlling each process such as washing, rinsing and dehydration.

  Conventionally, this type of drum-type washing machine is configured as shown in FIGS. 6 and 7 (see, for example, Patent Document 1). Hereinafter, the configuration will be described.

  As shown in FIGS. 6 and 7, the rotating drum 51 is provided with a large number of water passage holes 52 in the outer peripheral portion and is rotatably disposed in the water receiving tank 53. A rotating shaft 54 inclined forward and upward is provided at the rotation center of the rotating drum 51, and a motor 55 is connected to the rotating shaft 54 to rotate the rotating drum 51. Several protruding plates 56 are provided on the inner wall surface of the rotating drum 51.

  The water receiving tub 53 is suspended from the washing machine main body 57 so as to be swingable by a spring body 58, one end of the drain hose 59 is connected to the lower part of the water receiving tub 53, and the other end of the drain hose 59 is connected to the drain pump 60. The washing water in the water receiving tank 53 is drained. The water supply valve 61 supplies washing water into the water receiving tank 53. The water level detection means 62 detects the water level in the water receiving tank 53.

  The control device 63 has a control means 64 constituted by a microcomputer, and controls the operation of the motor 55, the drainage pump 60, the water supply valve 61, etc. via the power switching means 65, and a series of washing, rinsing, dehydration and the like. The process is sequentially controlled. The input setting means 66 sets the driving course and the like, and the control means 64 inputs information from the input setting means 66 and displays it on the display means 67 based on the information to notify the user. The storage unit 68 stores data necessary for control by the control unit 64. In addition, 69 is a commercial power source and 70 is a power switch.

  The operation in the above configuration will be described. When laundry and detergent are put into the rotating drum 51, the power switch 70 is turned on, a start button (not shown) is pressed, and the washing process is started, the water supply valve 61 operates. When water is supplied into the water receiving tank 53 and a predetermined water level N101 is detected by the water level detecting means 62, the motor 55 is driven. Further, when a predetermined water level N102 (equal to or higher than N101) is detected, water supply is stopped.

  In the washing process, since water is contained in the laundry, the rotating drum 51 performs normal rotation, stop, inversion, and stop driving at a predetermined number of rotations and a predetermined time while the water is being supplied. The laundry inside is caught by the protruding plate 56 by the agitation, 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 finished, the drainage pump 60 is operated to drain the washing water in the water receiving tank 53.

  In the rinsing process, an intermediate dehydration process is performed in order to discharge the detergent liquid first absorbed in the laundry. First, the motor 55 is continuously rotated at a predetermined rotation speed and a predetermined time, and the rotary drum 51 is driven. The laundry is dehydrated by increasing the number of rotations while the laundry is attached to the inner wall of the rotary drum 51, and the centrifugal force removes moisture in the laundry.

Next, as in the washing step, the rotating drum 51 is agitated by the motor 55 while supplying water, and the laundry in the rotating drum 51 is caught by the protruding plate 56 by the agitation and is lifted and falls onto the water surface. By this operation, the rinsing water is absorbed and discharged by the laundry, and the detergent liquid in the laundry is diluted. When the rinsing process is completed, the drain pump 60 is operated to drain the rinse water in the water receiving tank 53.

  As described above, the intermediate dehydration is generally performed in the rinsing step. In addition, in the case of laundry having poor water retention or a small amount of laundry, it is considered to shorten the time for intermediate dehydration for the purpose of preventing pain in the laundry (see, for example, Patent Document 2). ).

JP 10-216390 A JP-A-62-142584

  However, in the conventional configuration, in the rinsing process, the washing performance in the rotating drum 51 is given to the laundry in the rotating drum 51 by agitation of the rotating drum 51 to provide the rinsing water to ensure the rinsing performance. For this reason, in a drum-type washing machine with a small amount of water supply, it takes time until the rinse water is uniformly applied to the laundry, causing unevenness in rinsing, reducing the rinsing force, and increasing the time required for rinsing. Had.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems, and to enable efficient rinsing without increasing the time required for rinsing.

  In order to solve the above-described conventional problems, the drum type washing machine of the present invention performs rinsing a plurality of times and performs intermediate dehydration before the rinsing in the rinsing step. Rotating at a plurality of different steady rotation speeds and a maximum rotation speed set higher than the plurality of steady rotation speeds, and driving the rotary drum at the maximum rotation speed at the plurality of steady rotation speeds. It is set to be shorter than the sum of time.

  As a result, a large amount of water from the laundry is drained outside the washing machine due to the rotation time at the steady rotation speed of the plurality of rotation drums until the rotation drum reaches the maximum rotation speed. The amount of drainage after the drum reaches the maximum number of revolutions is small, and it is difficult to improve rinsing performance significantly. Therefore, by making the rotation time at the maximum rotation speed of the rotating drum smaller than the sum of the rotation times at the steady rotation speeds of the plurality of rotating drums, noise and vibration during intermediate dehydration can be suppressed and energy saving can be achieved. Further, since the amount of water remaining in the laundry is slightly increased, the amount of water supplied in the rinsing process can be reduced, and the rinsing performance can be improved by adding a predetermined amount of water and increasing the amount of rinse water.

  The drum type washing machine of the present invention can suppress noise and vibration during intermediate dewatering, save energy, and improve the rinsing performance of the laundry.

Sectional drawing of the drum type washing machine in Embodiment 1 of this invention Block diagram of the drum type washing machine Process diagram showing operation of the drum type washing machine Time chart showing the operation of the drum type washing machine Time chart showing the operation of the drum type washing machine Sectional view of a conventional drum-type washing machine Block diagram of the drum type washing machine

  A first aspect of the present invention relates to a rotating drum rotatably disposed in a water receiving tank, a motor for driving the rotating drum, water supply means for supplying water to the water receiving tank, and washing water in the water receiving tank. And a control means for controlling the driving of the motor and controlling each of the washing process, the rinsing process, and the dehydrating process, and the control means executes rinsing a plurality of times in the rinsing process. The intermediate dehydration is performed before the rinsing, and the intermediate dehydration rotates the rotary drum at a plurality of steady rotation speeds having different rotation speeds and a maximum rotation speed set higher than the plurality of steady rotation speeds. The time for driving the rotary drum at the maximum rotational speed is set to be shorter than the sum of the times for driving at the plurality of steady rotational speeds. In intermediate dewatering, the relationship between the amount of waste water and the intermediate dewatering time shows a saturation curve, and especially when the intermediate dewatering speed reaches the maximum speed, washing becomes longer as the intermediate dewatering time at the maximum speed becomes longer. The amount of wastewater from the object is reduced. In addition, the detergent concentration in the drainage tends to decrease as the rotational speed of the rotating drum increases, and the laundry is dependent on the rotational time at the steady rotational speed of the rotating drums until the rotating drum reaches the maximum rotational speed. Since much of the water from the washing machine is drained outside the washing machine, even if the rotation time at the maximum number of revolutions of the rotating drum is increased, the amount of water discharged from the washing machine to the outside of the washing machine is not significantly increased. Absent. Accordingly, the amount of detergent discharged from the laundry is small for consuming a lot of power due to the high rotation of the rotating drum. The present invention increases the sum of the time for rotating at a plurality of steady rotational speeds in which the detergent is efficiently discharged from the laundry, rather than the holding time at the maximum rotational speed in the intermediate dewatering. In addition to suppressing noise and vibration at the maximum rotation speed, it becomes possible to efficiently discharge detergent with reduced power consumption, and the pain of laundry due to intermediate dehydration can be reduced. Also, since the rotation time at the maximum number of rotations is shortened, the amount of water remaining in the laundry is slightly increased, but since this water has a sufficient ability to hold the detergent that has moved from the laundry, By using it, water supplied for rinsing can be saved, or rinsing water can be added as usual to increase the rinsing water, thereby further improving the rinsing performance. And the time shortened by the maximum rotation speed can improve a rinse performance significantly by utilizing the time for the stirring time after water supply to the predetermined water level where the rinse performance becomes the best.

  In the second invention, in particular, the control means of the first invention makes the time for driving the rotating drum at the maximum number of rotations shorter than the shortest time of each driving time set at a plurality of steady rotation speeds. Since the amount of detergent discharged from the laundry is small and the rinsing efficiency is not so good, the holding time at the maximum rotation speed in the intermediate dehydration is further shortened. In addition to suppressing vibration, it is possible to efficiently discharge detergent with reduced power consumption, and to reduce the pain of laundry due to intermediate dehydration. Further, since the intermediate dehydration time is further shortened, the amount of power consumption can be reduced in the rinsing process. Furthermore, since the rotation time at the maximum number of rotations is shortened, the amount of water remaining in the laundry is slightly increased, but since this water has a sufficient ability to hold the detergent that has moved from the laundry, By using it, the water supplied for rinsing can be saved, or the rinsing water can be added as usual to increase the rinsing water to further improve the rinsing performance. Further, the rinsing performance can be further improved by using the time shortened by the intermediate dehydration more than the first invention by increasing the stirring time after the water supply to a predetermined water level where the rinsing performance is the best. it can.

  In the third aspect of the invention, in particular, the control means of the first or second aspect of the invention sets the steady rotational speed of the plurality of rotating drums to a rotational speed that avoids the resonant rotational speed. The driving time can avoid the resonance of the water receiving tub and the washing machine body, so that vibration and noise during intermediate dehydration can be reduced.

  In the fourth aspect of the invention, in particular, the control means of any one of the first to third aspects sets the time for driving the rotating drum at the maximum number of rotations during the intermediate dehydration of the second rinse in the rinse step. By setting it to be shorter than the time to drive the rotating drum at the maximum rotation speed during intermediate dehydration of the rinse, the amount of laundry detergent is greatly reduced during the second intermediate dehydration, so the rinsing performance is improved. The rinsing time can be shortened without lowering.

  In the fifth aspect of the invention, in particular, the control means of any one of the first to fourth aspects of the invention is set so that rinsing is performed twice in the rinsing step, and stirring after supplying water to a predetermined water level in the second rinsing. By setting the time to be shorter than the stirring time after water supply to the predetermined water level of the first rinse, the amount of detergent contained in the laundry is greatly reduced in the second rinse, so the rinse performance The rinsing time can be shortened without lowering.

  In the sixth aspect of the invention, in particular, the rotation shaft of the rotary drum of any one of the first to fifth aspects can be inclined forward so as to improve the contact with the laundry with a small amount of rinse water. And the rinsing effect can be enhanced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a sectional view of a drum type washing machine according to a first embodiment of the present invention, FIG. 2 is a block circuit diagram of the drum type washing machine, and FIG. 3 is a process showing the operation of the drum type washing machine. 4, 4 and 5 are time charts showing the operation of the drum type washing machine.

  1 to 5, the rotating drum 1 is provided with a large number of water passage holes 2 on the outer peripheral portion and is rotatably disposed in the water receiving tank 3. A rotating shaft 4 is provided at the center of rotation of the rotating drum 1 so as to incline forward from the horizontal direction. A motor 5 is connected to the rotating shaft 4 so that the rotating drum 1 is driven to rotate forward and backward. Several protruding plates 6 are provided on the inner wall surface of the rotating drum 1.

  The water receiving tub 3 is suspended from the washing machine body 7 by a spring body 8 so as to be swingable. One end of a drain hose 9 is connected to the lower part of the water receiving tub 3 and the other end of the drain hose 9 is connected to a drain means. The washing water in the water receiving tub 3 is drained by connecting to the drainage pump 10 to be configured. The water supply valve 11 constituting the water supply means supplies the washing water and the rinsing water into the water receiving tank 3. The water level detection means 12 detects the water level of the wash water and the rinse water in the water receiving tub 3.

  The control device 13 has a control means 14 composed of a microcomputer, controls the operation of the motor 5, the drainage pump 10, the water supply valve 11 and the like via the power switching means 15, and performs a series of washing, rinsing, dehydration and the like. The process is sequentially controlled.

  The input setting means 16 sets the driving course and the like, and the control means 14 inputs information from the input setting means 16 and displays it on the display means 17 based on the information to notify the user. The storage means 18 stores data necessary for control by the control means 14. In addition, 19 is a commercial power source and 20 is a power switch.

  Reference numeral 21 denotes a rotational speed detection / steady time measuring means for detecting the rotational speed of the rotary drum 1 and measuring each steady time when the rotational speed of the rotary drum 1 is steady. Information of the measuring means 21 is sent to the control means 14, and the rotational speed of the rotating drum 1 is controlled via the power switching means 15.

Next, the operation of the drum type washing machine of the present invention will be described. In the washing step of the washing step shown in FIG. 3, the control means 14 operates the water supply valve 11, supplies the washing water into the water receiving tub 3, wets the laundry in the rotating drum 1, and dissolves the detergent. . Further, the control means 14 drives the motor 5 to rotate the rotary drum 1.

  As a result, the laundry in the rotating drum 1 is caught on the projection plate 6 and dropped onto the water surface where the detergent is dissolved, so that the washing is performed for a predetermined time, and the detergent permeates and discharges the laundry. To clean the laundry. When the washing of the laundry is completed, the control means 14 operates the drain pump 10 to drain the washing water in the water receiving tub 3.

  After the washing process, the process proceeds to the rinsing process, and the first rinsing is performed in which the steps of intermediate dehydration, water supply stirring, stirring after water supply to a predetermined water level, and draining are sequentially performed. As shown in FIG. 4, the control means 14 sends a signal to the motor 5 to start a balance control operation for the laundry in the rotary drum 1 necessary for performing intermediate dehydration. This balance control operation is performed using a general vibration detection sensor (not shown) or the like in order to reduce vibration when the rotary drum 1 is rotated at a high speed, and the rotation speed is, for example, about 50 r / min.

  After the balance control operation is completed, the control means 14 gradually increases the rotational speed of the motor 5 to increase the rotational speed of the rotary drum 1, thereby dehydrating the washing water from the laundry. In this intermediate dehydration, the control means 14 passes the resonance rotational speed (about 120, 240, 360 r / min) of the water receiving tank 3 at a high speed, avoids vibration and noise due to resonance, and, for example, about 130, 330, The rotating drum 1 is rotated for a predetermined time at each rotation speed of 400 r / min, and the rotation speed detection / steady time measuring means 21 measures predetermined rotation times t1, t2, t3 at each steady rotation speed, and at that time Is checked by a general vibration detection sensor (not shown).

  If the vibration detected by the vibration detection sensor is less than or equal to a predetermined value, the rotational speed of the rotary drum 1 is increased to a set maximum rotational speed (for example, 900 r / min), and after rotating at this maximum rotational speed for t4 hours, The control means 14 stops the rotating drum 1 via the power switching means 15. At this time, the time t4 is smaller than the total time (t1 + t2 + t3) of t1, t2, and t3. For example, t1 is set to 1 minute, t2 and t3 are set to 0.5 minutes, and t4 is set to 0.5 minutes. (1 minute + 0.5 minutes + 0.5 minutes) = 2 minutes> 0.5 minutes.

  After completion of the intermediate dehydration, the laundry is in a state of sticking to the inner peripheral wall surface of the rotating drum 1 to some extent. Next, the control means 14 opens the water supply valve 11 and accumulates rinsing water in the water receiving tank 3 while rotating the rotary drum 1 in a fixed direction via the power switching means 15. The rotation speed of the rotating drum 1 at this time is, for example, 80 r / min, and the laundry is maintained in a state of being stuck to the inner peripheral wall surface of the rotating drum 1.

  When the rinse water accumulates in the water receiving tank 3 and the water level detecting means 12 detects the predetermined water level N1, the control means 14 stops water supply and the rotational speed of the rotating drum 1 from 80 r / min to the predetermined rotational speed. When the predetermined time T1 is reached, the control means 14 reduces the number of rotations of the rotating drum 1 and resumes water supply, and tumbles the rotating drum 1 to drive the stirring. By this operation, the laundry stuck to the inner peripheral wall surface of the rotating drum 1 is peeled off, and the laundry in the rinsing water collected in the water receiving tub 3 is stirred and rinsed.

When the water level detection means 12 detects a predetermined water level N2, the control means 14 stops water supply and starts measuring the stirring time after water supply to the predetermined water level of the rotary drum 1. The stirring time t5 is set longer than the time t4 at the maximum rotation speed, and when the stirring time t5 is reached, the control means 14 stops the operation of the rotating drum 1. Thereafter, the control means 14 operates the drain pump 10 to discharge the rinse water out of the washing machine body 7 and complete the first rinse.

  The stirring time t5 is generally set to 5 because the restriction on the time until completion of washing and after a certain amount of rinsing has been performed, the rinsing effect is difficult to improve even if the stirring time t5 is increased. Is less than a minute.

  Next, the second rinsing process of the rinsing process is performed, and, similarly to the first rinsing process, the steps of water supply agitation, agitation after water supply to a predetermined water level, and drainage are sequentially performed following the intermediate dehydration. In the second rinsing, after the balance control operation of the laundry in the rotating drum 1 is performed, the operation until the rotating speed of the rotating drum 1 is increased to a set maximum rotating speed (for example, 900 r / min) is This is the same as the first rinse, and the detailed explanation here uses the first rinse.

  In the second rinsing, the control means 14 stops the rotating drum 1 via the power switching means 15 after a predetermined time t6 rotation at this maximum rotation speed. At this time, the time t6 is a value smaller than the total time (t1 + t2 + t3) of t1, t2, and t3, and similarly to the first rinse, t1 is 1 minute, t2 and t3 are 0.5 minutes, and t6 Is set to 0.3 minutes.

  After completion of the intermediate dehydration, the laundry is in a state of sticking to the inner peripheral wall surface of the rotating drum 1 to some extent. Next, the control means 14 opens the water supply valve 11 and accumulates rinse water in the water receiving tub 3, and the rotating drum 1 performs a stirring operation via the power switching means 15, and the laundry stuck to the rotating drum 1. Is removed from the rotating drum 1 and the laundry in the rinse water accumulated in the water receiving tub 3 is stirred to perform rinsing.

  When the rinsing water accumulates in the water receiving tank 3 and the water level detection means 12 detects the water level N3 (less than the first rinsing N2), the control means 14 stops the water supply and after the water supply to the predetermined water level of the rotary drum 1 Measurement of the stirring time t7 is started.

  The stirring time t7 is set longer than the rotation time t6 at the maximum rotation speed of intermediate dewatering. When the stirring time t7 has elapsed, the control means 14 stops the operation of the rotary drum 1. The stirring time t7 is set to 5 minutes or less similarly to the first rinsing and is shorter than the first rinsing stirring time t5. Thereafter, the control means 14 operates the drain pump 10 to discharge the rinsing water out of the washing machine body 7, completes the second rinsing, and ends the rinsing process.

  Thereafter, the process proceeds to the dehydration process, and the control means 14 sends a signal to the motor 5 to start the balance control operation of the laundry in the rotating drum 1 necessary for the final dehydration in the dehydration process. This balance control operation is performed using a general vibration detection sensor (not shown) or the like in order to reduce vibration when the rotating drum 1 is rotated at high speed.

  After completion of the balance control operation, the rotational speed of the rotary drum 1 is gradually increased via the motor 5 and controlled to 900 r / min, for example. By this operation, the rinsing water is dehydrated from the laundry, and after the predetermined time has elapsed, the control means 14 stops the rotating drum 1 via the power switching means 15 and the dehydration process is completed, whereby the washing process is completed, and the control means 14 turns off the power of the washing machine body 7.

In the intermediate dehydration performed in the first and second rinses in the rinsing process, the amount of drainage shows a saturation curve with respect to the elapsed time, and the amount of drainage discharged from the laundry with the passage of the intermediate dehydration time is Less. Also, the detergent concentration of the drainage tends to decrease as the rotational speed of the rotary drum 1 increases, and the washing time depends on the rotational time at the steady rotational speed of the plurality of rotary drums until the rotational drum reaches the maximum rotational speed. Since much of the water from the laundry is drained outside the washing machine, a significant increase in the amount of water discharged from the laundry to the washing machine is recognized even if the rotation time at the maximum rotation speed of the rotating drum is increased. Not.

  Thus, even if the rotation time at the maximum rotation speed in the intermediate dehydration is long, the amount of detergent discharged from the washing machine body 7 tends to be very small compared to the case where the rotation time at the maximum rotation speed is short. In other words, with regard to the discharge of the detergent from the laundry in the intermediate dehydration, the discharge amount at the rotation times t1, t2, and t3 is increased at the above-described steady rotation speed, and the times t4 and t6 at the maximum rotation speed are lengthened. However, the amount of detergent discharged from laundry does not improve greatly.

  In addition, as described above, the concentration of the detergent in the water discharged from the laundry by intermediate dehydration becomes thinner as the intermediate dehydration time becomes longer, so that water that can be effectively used for rinsing to discharge less detergent is washed. It is supposed to be thrown out of the machine 7.

  From the above, by making the rotation times t4 and t6 at the maximum rotation speed in the intermediate dehydration smaller than the sum of the rotation times t1, t2 and t3 at the steady rotation speed, that is, (t1 + t2 + t3), Since the rotation time at the maximum rotation speed of intermediate dehydration with large vibration and energy consumption is shortened, the generation time of noise and vibration can be shortened and the energy consumption can be greatly reduced.

  In addition, since the rotation time at the maximum rotation speed of the intermediate dehydration is shortened, the pain of the laundry due to the intermediate dehydration can be reduced. Furthermore, with regard to the rinsing performance, by reducing the rotation time at the maximum rotation speed of intermediate dehydration, the detergent concentration remaining in the laundry is higher than that at the rotation speed at the steady rotation speed indicated by rotation times t1, t2, and t3. Low water remains and can be used to save water supplied for rinsing, and rinsing water can be added as usual to increase rinsing performance. Can be made.

  Further, the intermediate dehydration time is shortened by making the rotation times t4 and t6 at the maximum rotation speed of the intermediate dehydration smaller than the sum of the rotation times t1, t2 and t3, that is, (t1 + t2 + t3) at the steady rotation speed. However, if the time of the rinsing process is the sum of the drainage, the intermediate dehydration time, the feed water stirring time, and the stirring time after water supply to the predetermined water level, the amount of reduction in the intermediate dehydration time is set to By adding to the agitation time after the water supply, the agitation is performed in a state where the rinse water is the most, so that the rinsing performance can be greatly improved.

(Embodiment 2)
The feature of the present embodiment is that, in the rinsing step, the time t6 for driving the rotating drum 1 at the maximum number of rotations during the intermediate dewatering of the second rinsing is driven, and the rotating drum is driven at the maximum number of rotations during the first rinsing of the intermediate The time is set to be shorter than the time t4. Other configurations are the same as those of the first embodiment, and those in the first embodiment are used for the detailed description.

  According to the above configuration, in the second rinsing, the amount of detergent contained in the laundry is greatly reduced, so that the rinsing time can be shortened without reducing the rinsing performance.

(Embodiment 3)
The feature of the present embodiment is that the rinsing process is set so that the rinsing is performed twice, and the stirring time t7 after supplying water to the predetermined water level of the second rinsing is the stirring after supplying water to the predetermined water level of the first rinsing. This is set to be shorter than time t5. Other configurations are the same as those of the first embodiment, and those in the first embodiment are used for the detailed description.

According to the above configuration, in the second rinsing, the amount of detergent contained in the laundry is greatly reduced, so that the rinsing time can be shortened without reducing the rinsing performance.

  In the embodiment of the present invention, in the water supply stirring in the rinsing step, the rinse water can be supplied to the laundry in the rotary drum 1 in a shower shape. In this case, the rinsing water supplied from the water supply valve 11 to the water receiving tub 3 is circulated into the rotary drum 1 so that the rinsing water can quickly permeate the laundry and act effectively. The rinsing performance can be further improved. In the present invention, the water supply configuration for the laundry is not limited.

  Further, in the embodiment of the present invention, the detection of the rotational speed of the rotating drum 1 and the measurement of the time at each steady rotational speed when the rotational speed of the rotating drum 1 is steady are the rotational speed detection and steady time measurement. Although configured as a means, the outputs of the means for detecting the rotational speed and the means for measuring the time at the steady rotational speed can be input to the control means 14.

  As described above, the drum-type washing machine according to the present invention is useful as a drum-type washing machine because it can suppress noise and vibration during intermediate dehydration, and can save energy and improve the rinsing performance of the laundry. It is.

1 Rotating drum 3 Water receiving tank 5 Motor 10 Drain pump (drainage means)
11 Water supply valve (water supply means)
14 Control means

Claims (6)

A rotating drum rotatably disposed in the water receiving tank, a motor for driving the rotating drum, a water supply means for supplying water into the water receiving tank, and a draining means for draining the washing water in the water receiving tank. Control means for controlling the driving of the motor and controlling each of the washing process, the rinsing process, and the dehydrating process, and the control means executes the rinsing a plurality of times before the rinsing in the rinsing process. The intermediate dehydration is performed by rotating the rotating drum at a plurality of steady rotation speeds having different rotation speeds and a maximum rotation speed set higher than the plurality of steady rotation speeds, and at the maximum rotation speed. A drum-type washing machine in which a time for driving the rotating drum is set to be shorter than a sum of times for driving at the plurality of steady rotational speeds. 2. The drum type washing machine according to claim 1, wherein the control means sets the time for driving the rotating drum at the maximum number of rotations to be shorter than the shortest time for each of the driving times set at a plurality of steady rotation speeds. The drum type washing machine according to claim 1 or 2, wherein the control means sets the steady rotational speed of the plurality of rotating drums to a rotational speed that avoids the resonant rotational speed. In the rinsing process, the control means makes the time for driving the rotating drum at the maximum rotation speed during the second intermediate dewatering shorter than the time for driving the rotating drum at the maximum rotation speed during the first intermediate dehydration. The drum type washing machine according to any one of claims 1 to 3, wherein The control means is set so that the rinsing is performed twice in the rinsing step, and the stirring time after supplying water to the predetermined water level of the second rinsing is shorter than the stirring time after supplying water to the predetermined water level of the first rinsing. The drum type washing machine according to any one of claims 1 to 4, wherein The drum type washing machine according to any one of claims 1 to 5, wherein a rotating shaft of the rotating drum is inclined forwardly upward.

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