JP4665711B2 - Drum washing machine - Google Patents

Description

  The present invention relates to a drum-type washing machine that performs each process such as washing, rinsing, and dewatering in a rotating drum having a rotating shaft in a horizontal direction or an oblique direction.

  A conventional drum type washing machine of this type is configured as shown in FIG. The configuration will be described below.

  FIG. 11 is a cross-sectional view of a drum type washing machine in which the rotating shaft of the rotating drum is in the horizontal direction.

  An outer tub 102 supported by a suspension and a rotating drum 103 rotatably supported in the outer tub 102 are disposed in the drum-type washing machine housing 101. The rotating drum 103 is rotationally driven by a drive motor 104 fixed to the outer bottom portion of the outer tub 102. By opening the door body 105 that can be freely opened and closed on the front side of the housing 101, the laundry can be taken in and out of the rotary drum 103 through the opening 102a of the outer tub 102 and the opening 103a in the rotary drum 103. It is like that.

  A washing process in such a drum type washing machine will be described. When the door body 105 is opened, laundry is put into the rotating drum 103, and a detergent is further put in to start the operation, first, the water supply valve 106 is opened and water is supplied into the outer tub 102 to a predetermined water level. Thereafter, when the rotary drum 103 is driven to rotate at a predetermined rotational speed by the drive motor 104, the laundry stored in the rotary drum 103 is hooked on a plurality of stirring protrusions (baffles) 107 provided on the inner surface of the rotary drum 103. It is lifted in the direction of rotation, dropped from an appropriate height, and washed with its impact force, so-called scrubbing is performed (see, for example, Patent Document 1).

  After this washing process, the dirty washing water is drained, and the rinsing process is performed using newly supplied water. When the rinsing process is completed, a dehydrating process is performed in which the rotating drum 103 is rotated at a high speed. These steps are automatically executed based on predetermined control means.

As a characteristic of this type of drum type washing machine, while the amount of washing water can be reduced, in such a configuration, the washing process is performed in a state where the laundry does not contain enough washing water, and the weight of the laundry is also reduced. There is a problem in that it takes a long time to wash in order to ensure deficiency of washing power, washing unevenness, and a certain degree of washing power by performing tapping washing by dropping.

In order to solve these problems, as a conventional technique, the washing water collected in the outer tub 102 is sucked up by a circulation pump, and returned to the rotating drum, thereby sufficiently supplying the washing water to the laundry and increasing the cleaning power. (See, for example, Patent Document 2).
JP-A-9-215894 JP-A-9-215893

  However, in the conventional configuration, since the amount of water that can be circulated by the circulation pump is affected by the capacity of the circulation pump, a large-scale circulation pump is required to sufficiently supply the washing water to the laundry. On the other hand, there was a problem that the washing machine main body had to be made compact, and as a result, the circulation pump had to be made small, and therefore there was a problem that a sufficient amount of circulating water could not be obtained. Further, since a new configuration called a circulation pump is required, the configuration becomes complicated, and there are problems in terms of productivity and manufacturing cost.

  In addition, if a large amount of detergent foam is generated by circulating washing water, the impact force of tapping washing's own weight drop will be relaxed by the foam, and the problem that the cleaning power will be reduced, There was also a problem that intrusion into parts and the like caused deterioration of insulation.

  The present invention solves the above-described conventional problems, and by returning the washing water in the outer tub to the rotating drum without using a circulation pump or the like, the cleaning power can be improved and the cleaning unevenness can be reduced. Another object of the present invention is to provide a drum type washing machine that suppresses the production cost and reduces the generation of detergent bubbles due to the circulation of washing water, thereby preventing detergency and insulation deterioration.

In order to achieve the above object, the drum-type washing machine of the present invention performs a first washing process in which a washing process is performed by lifting the rotating drum in a rotating direction by rotating the rotating drum and dropping it from an appropriate height for cleaning for a first predetermined time. A shower that causes the laundry to stick to the inner peripheral wall of the rotating drum by centrifugal force and to discharge the washing water from the discharge port by rotating the rotating drum at a second predetermined rotation speed higher than the first predetermined rotation speed. The discharge process is performed for a second predetermined time, and the washing process and the shower discharge process are alternately performed, and while the bubble detection means detects bubbles, the shower discharge process is not performed. The tapping process is performed .

Accordingly, since the washing water is sprinkled on the laundry and circulated, the washing water is easily included in the laundry, so that the cleaning power is improved and the unevenness in washing can be reduced. Further, by alternately performing the tapping washing process and the shower discharging process, the washing can be performed with the washing water sufficiently infiltrated into the laundry in the shower discharging process. Can be reduced. In addition, while the bubble detection means detects bubbles, the washing process of rotating the rotating drum at a low speed is performed without executing the shower discharge process of rotating the rotating drum at a high speed. It is possible to prevent the tank from being filled with bubbles, and it is possible to prevent a decrease in cleaning power.

Drum-type washing machine of the present invention, by circulating the washing water from the outer tub without using a circulation pump or the like to the rotary drum, the washing power is improved, it is possible to reduce uneven cleaning, beat-washing By alternately performing the process and the shower discharge process, the washing can be performed in the shower discharge process with the washing water sufficiently infiltrated into the laundry.
Improves cleaning power and can reduce unevenness in washing. Even if foaming is likely to occur depending on the type and amount of detergent, water temperature and amount, clothing type and amount, etc., the foam fills in the rotating drum or the outer tub. Can be prevented.

A drum-type washing machine according to a first aspect of the present invention includes a housing, a bottomed cylindrical outer tub that is included in the housing and has a first opening for clothes in and out, and is rotatably included in the outer tub. a bottomed cylindrical rotary drum having a rotary axis inclined from the second opening and a horizontal or horizontally to open in response to the first opening, and a drive motor for rotating the rotary drum, the outer A water supply means for supplying water into the tub, a water intake port that is provided in the outer tub and in which washing water that rotates in the outer tub with rotation of the rotating drum enters, a circulation water channel that communicates with one end of the water intake port, A foam detection means comprising a discharge port that communicates with the other end of the circulating water channel and discharges washing water into the rotating drum, and a pair of electrodes provided at least one above the water level during operation in the outer tub; Control and wash the drive motor, water supply means, etc. Technique, and a control means for executing the steps of dehydration, etc., the control means, by rotating the rotary drum at a first predetermined rotational speed, the laundry in the rotational direction by the rotation of the rotary drum A washing process of lifting and dropping from an appropriate height for washing is performed for a first predetermined time, and the rotating drum is rotated at a second predetermined rotational speed higher than the first predetermined rotational speed, thereby washing things shower discharge step of discharging the wash water from the discharge port causes stick to the inner peripheral wall of the rotary drum by centrifugal force to perform a second predetermined time, executing the bashing washing step and the shower discharge step are alternately At the same time, while the bubble detecting means is detecting bubbles, the whip washing step is executed without executing the shower discharge step.

According to this configuration, the washing water in the outer tub rotating with the rotation of the rotating drum is taken into the water intake provided in the outer tub, and the washing water taken from the water intake is discharged from the outlet to the rotating drum. Thus, the washing water is sprinkled on the laundry and circulated. Thereby, since wash water becomes easy to be included in the laundry, the cleaning power can be improved and cleaning unevenness can be reduced. Further, by alternately performing the tapping washing process and the shower discharging process, the washing can be performed with the washing water sufficiently infiltrated into the laundry in the shower discharging process. Can be reduced. In addition, depending on conditions such as detergent type and amount, water temperature and quantity, clothing type and amount, foaming may occur easily. While the foam detection means detects foam, the rotating drum rotates at high speed. Since the washing process of rotating the rotating drum at a low speed without executing the shower discharge process is performed, there is no reduction in cleaning power, and it is possible to prevent bubbles from being filled in the rotating drum or the outer tub.

  According to a second aspect of the present invention, in the first aspect of the present invention, when the bubble detecting means detects bubbles during execution of the shower discharge process, the control means immediately stops the shower discharge process and starts the washing process. In addition to the transition, the washing process after the transition is a washing sequence in which the washing is performed with a weaker stirring force than that when the foam detection means does not detect foam.

  According to this configuration, if the shower discharge process is continuously executed under the condition that bubbles are easily generated, the bubbles grow rapidly.When the bubble detecting means detects the bubbles, the shower discharge process is immediately stopped, In order to prevent the foam from filling up in the rotating drum and the outer tub, and to make the washing sequence with a weak stirring force, such as setting the rotational speed of the rotating drum lower than that of the usual washing, Can suppress and defoam.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the control means sets the rotating drum at a third predetermined rotational speed higher than the first predetermined rotational speed before the scrubbing step and the shower discharge step. It has a foam generation process that foams washing water in the outer tub by rotating, and when the foam detection means detects foam during the foam generation process, the foam generation process is immediately stopped, It moves to the water supply process of a process.

  The purpose of foam generation is to make a small amount of washing water in the form of foam with a large volume and adhere to the laundry in the rotating drum. This is because the unevenness of washing is reduced and the cleaning power is improved. However, when the amount is too large, the bubble has a buffering effect, which deteriorates the washing performance.

  According to the above configuration, if the foam generation process is continuously performed under conditions that are liable to foam, the foam grows rapidly. Therefore, when the foam detection means detects the foam, the foam generation process is immediately stopped. In particular, it is possible to prevent the foam from being filled in the rotating drum or the outer tub. At this time, since the amount of foam generated is large, the necessary amount is sufficient, so there is no problem even if the foam generation process is stopped and the process proceeds to the next process.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, before the foam generation step, the control means rotates the rotating drum at a fourth predetermined rotational speed that is higher than the first predetermined rotational speed of the scrubbing step. It has a detergent dissolution process that dissolves the detergent in the outer tub by rotating, and when the foam detection means detects foam during execution of the detergent dissolution process, it immediately stops the detergent dissolution process and The foam generation process of the process is also stopped, and the process proceeds to the next water supply process.

  According to this configuration, if the detergent dissolution process is continuously performed under conditions where foaming is likely to occur, the foam grows rapidly. When the foam detection means detects the foam, the detergent dissolution process is immediately stopped. It is possible to prevent bubbles from being filled in the rotating drum or the outer tub. In addition, since there is much foam generation amount at this time, while canceling | dissolving a detergent melt | dissolution process, the foam production | generation process of the next process is stopped, and there is no problem even if it transfers to the following process.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, when the foam detecting means detects bubbles during the execution of the detergent dissolving step or the foam generating step, the second means of the shower discharge step is used. The rotational speed is changed to be low or the second predetermined time is changed to be short.

  According to this configuration, when it is determined that the amount of foam generated is large in the initial detergent dissolution process or foam generation process of the washing process, the rotation speed of the shower discharge process of the next process should be reduced or the operation time should be shortened. Therefore, it is possible to reduce the stirring force and suppress the amount of foam generated, and since it is not necessary to detect bubbles in a mischievous manner and make the subsequent washing wash a weaker washing sequence than a normal washing wash, it is possible to ensure the washing power, The laundry time does not have to be extended unnecessarily.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the present invention is not limited by this execution mode.

(Embodiment)
FIG. 1 shows a cross-sectional view of a drum type washing machine in an embodiment of the present invention. In FIG. 1, a bottomed cylindrical outer tub 6 is inclined downward from the front side to the back side of the casing 1 by a suspension configuration (not shown) in the casing 1 of the drum type washing machine. It is supported by anti-vibration. The outer tub 6 is composed of the outer tub main body 2 and the outer tub cover 3, and is connected and fixed in a watertight manner via the first packing member 4 at the connecting portion. The outer tub 6 rotatably supports a rotating drum 5 formed in a cylindrical shape with a bottom on the inner side so that the rotating shaft is inclined downward from the front side to the back side of the housing 1. .

On the front side of the housing 1 is formed a housing opening 1a for taking in and out the laundry,
Furthermore, a door body 8 that covers the housing opening 1a so as to be freely opened and closed is provided.

  The outer tank cover 3 is provided with an outer tank cover opening (first opening) 3a at a position corresponding to the housing opening 1a, and the rotating drum 5 is provided with the housing opening 1a and the outer tank cover opening. A rotary drum opening 5a (second opening) is provided at a position corresponding to the portion 3a. The laundry is put into and out of the rotating drum 5 from the outside of the casing 1 through the casing opening 1a, the outer tub cover opening 3a, and the rotating drum opening 5a.

  The rotary drum 5 includes a rotary drum front surface portion 5b provided with a rotary drum opening 5a, a bottomed cylindrical barrel portion, and a rotary drum barrel portion 5c having a plurality of drain holes 5g and a bottom portion. The drive motor 7 is composed of a rotating drum bottom portion 5d, and a plurality of stirring protrusions 5e are provided on the inner surface of the rotating drum body portion 5c. The drive motor 7 is attached to the outer side of the outer tank body bottom portion 2c of the outer tank body 2. The rotational speed and direction of rotation are variable.

  One end of the first water supply hose 10a is connected to the first water supply valve (first water supply means) 9, and the other end of the first water supply hose 10a is connected to the water injection cap 10b. The water injection cap portion 10 b is opened in a slit shape so that water to be injected is injected into the rotating drum 5 while spreading in a substantially horizontal direction, and water is injected so as to spread into the rotating drum 5.

  One end of a second water supply hose 13a is connected to the second water supply valve (second water supply means) 11, and the other end of the second water supply hose 13a is connected to a detergent case 13c that houses the detergent 13b. One end of the third water supply hose 13d is connected to the lower part of the case 13c, and the other end of the third water supply hose 13d is connected to the outer tub 6 so that water can be supplied into the outer tub 6.

  The upper surface of the detergent case 13c is provided with a plurality of water injection holes 13e for pouring water supplied by the second water supply hose 13a into the detergent case 13c in a shower shape, and the shower-like water coming out of the water injection holes 13e is detergent. It falls onto 13b and flows into the outer tub 6 together with the detergent 13b. The washing water that has flowed down into the outer tub 6 is drained out of the outer tub 6 by opening the drain valve 43 provided in the middle of the drain pipe 42 during the draining process after the washing process and the rinsing process.

  Further, the drum type washing machine in the present embodiment has a drying function for drying the laundry in the rotary drum 5. FIG. 2 is a side cross-sectional view showing a circulation air blowing path for blowing air into the outer tub 6 of the drum type washing machine in the embodiment of the present invention.

  As shown in FIG. 2, a fan case 46 in which a heater 44 and a blower fan 45 are housed is provided above the housing 1. By rotating the blower fan 45, an air flow is generated in the circulation blower path, and the air in the rotary drum 5 passes through the water passage hole 5 g provided in the side wall of the rotary drum 5, and the body of the outer tub 6. One end is exhausted from a hot air intake 47 provided in the section to a heat exchange path 48 communicating with the hot air intake 47. The air containing moisture is dehumidified in the heat exchange path 48 and further sent to the fan case 46 via the first bellows hose 49 communicating with the other end of the heat exchange path 48.

  The air heated by the heater 44 in the fan case 46 passes through the hot air blowing path 51 via the second bellows hose 50 that communicates with the fan case 46 at the blowing fan 45, and further on the back of the outer tub 6. Air is blown into the outer tub 6 from the hot air blowing port 52 that is provided and communicates with the other end of the hot air blowing path 51, and further blown into the rotating drum 5 through the water passage hole 5 g of the rotating drum 5. The laundry is dried by repeating the air circulation as described above for a predetermined time.

In addition, a bubble detection means 53 is provided which includes one electrode 53a provided in the lower front portion of the outer tub 6 and the other electrode 53b provided in the vicinity of the hot air blowing port 52 in the hot air blowing passage 51. The amount of foam caused by the detergent generated in the outer tub 6 is detected from the electrical resistance value, potential difference, and the like.

  FIG. 3 is a block diagram showing a circuit configuration of the drum-type washing machine control device 15 according to the embodiment of the present invention. The control device 15 includes a control unit 16, a setting unit 17, a storage unit 18, a power switching unit 19, and the like. The control means 16 constituted by a microcomputer or the like detects the amount of laundry from a setting input such as selection of a driving course input from the setting means 17 and a load change received by the drive motor 7 in accordance with the amount of laundry. The control program stored in the storage means 18 is input according to the input from the cloth amount detection means 12, the input from the water level detection means 14 for detecting the water level of the washing water in the outer tub 6, and the input from the foam detection means 53. The control command is output to the power switching means 19 by using it. The power switching means 19 is configured using a switching element such as an SCR (thyristor), and in response to a control command from the control means 16, the drive motor 7, the first water supply valve 9, the second water supply valve 11, and the drainage. The operation of the valve 43, the heater 44, the blower fan 45, etc. is controlled, and a series of processes such as washing, rinsing and dehydration are controlled.

  The drive motor 7 is constituted by, for example, a direct current brushless motor or the like, and is controlled by the control means 16 and the power switching means 19 so that the forward / reverse rotation and the rotation speed are variable.

  FIG. 4 is a perspective view of the outer tub main body 2 of the drum type washing machine in the embodiment of the present invention.

  FIG. 5 is a perspective view of the outer tub cover 3. The configuration of the circulating water channel will be described below with reference to FIGS.

  The outer tank main body 2 is a bottomed cylindrical type having an outer tank main body opening 2a, an outer tank main body body 2b, and an outer tank main body bottom 2c.

  An outer tank body bottom groove 2d formed in a substantially concave shape is formed on the inner surface of the outer tank body bottom 2c, in the vicinity of the boundary between the outer tank body bottom 2c and the outer tank body body 2b, and the outer tank body body 2b. It is provided in a substantially concentric circular arc shape. The outer tub main body bottom groove 2d has an outer tub main body groove lid 23 having a shape corresponding to the outer tub main body bottom groove 2d from the inner surface side through the second packing member 24 provided in the vicinity of the outer periphery. The outer tub main body bottom groove 2d and the outer tub main body groove lid 23 form a first circulation water channel 22 which is fixed by screws 25.

  The water intake 20 which is one end of the first circulating water channel 22 communicates with the guide recess 21 whose bottom surface gradually changes from the bottom surface of the outer tank main body bottom groove 2d to the inner surface of the outer tank main body bottom 2c. The outer tub main body 2 is integrally formed with a pipe-like second circulation water channel 26 communicating from the outer tub main body opening 2a to the outer tub main body bottom 2c outside the outer tub main body 2b. The end of the second circulating water channel 26 on the outer tub main body bottom 2 c side communicates with the other end of the first circulating water channel 22.

  The configuration of the outer tub cover 3 will be described with reference to FIG.

  The outer tank cover 3 is formed in a substantially cylindrical shape having an outer tank cover front surface portion 3b provided with an outer tank cover opening 3a, an outer tank cover body portion 3c, and an outer tank cover rear opening 3d.

  The outer tub cover 3 is connected to a position corresponding to the second circulation water channel 26 on the outside of the outer tub cover body portion 3c, and communicates from the outer tub cover rear opening 3d to the outer tub cover front surface portion 3b. A circulating water channel 27 is formed integrally.

On the inner surface of the outer tub cover front surface portion 3b, an outer tub cover front surface groove portion 3e formed in a substantially concave shape is bifurcated in the middle as it approaches the outer tub cover opening portion 3a from the outer peripheral side of the outer tub cover front surface portion 3b. It is provided in a substantially Y shape. An outer tub cover groove cover 29 having a shape corresponding to the shape of the outer tub cover front groove 3e is formed on the outer tub cover front groove 3e via the third packing member 30 provided in the vicinity of the outer periphery thereof. The outer periphery is fixed with screws 31. The outer tub cover front groove 3e and the outer tub cover groove lid 29 form a substantially Y-shaped fourth circulation water channel 28.

  One end, which is the substantially Y-shaped lower end of the fourth circulating water channel 28, communicates with the end of the third circulating water channel 27 on the outer tank cover front surface portion 3 b side. The outer tub cover groove lid 29 is provided with a circulation nozzle 34 having a discharge port 32 for discharging washing water in the vicinity of the bifurcated tip portion.

  With this configuration, as shown in FIG. 1, the discharge port 32 is disposed in the vicinity of the outer periphery of the outer tank cover opening 3a and so as to face the rotary drum opening 5a.

  Further, in a state where the outer tub body 2 and the outer tub cover 3 are connected and fixed and supported by the housing 1 as the outer tub 6, the discharge port 32 is located below the outer tub cover opening 3 a and the intake port 20. The lower position is provided.

  Further, when the outer tub main body 2 and the outer tub cover 3 are connected and fixed, the second circulating water channel 26 and the third circulating water channel 27 are connected and fixed to the outer tub main body 2 and the outer tub cover 3 described above. In the same manner as above, it is connected and fixed in a watertight manner via the first packing member 4.

  6A is a front view of the circulation nozzle 34, FIG. 6B is a plan view of the circulation nozzle 34, and FIG. 6C is a side cross-sectional view of the circulation nozzle 34 according to the embodiment of the present invention. FIG.

  The circulation nozzle 34 has one end communicating with the fourth circulation water channel 28 and the other end protruding toward the inner surface of the rotary drum 5. The lower half is the lower half of the end protruding from the nozzle 34 a. The upper half is inclined away from the tip of the nozzle 34a as it goes toward the inner surface of the rotary drum 5, and the upper end of the upper half is substantially the same height as the upper end of the nozzle 34a. And a substantially disc-shaped adjusting plate 33 formed in the above. The discharge port 32 is formed by separating the upper half of the adjustment plate 33 from the nozzle 34a. Further, by adjusting the inclination angle of the adjustment plate 33, the discharge angle of the washing water that has passed through the first to fourth circulation water channels 22, 26, 27, and 28 can be adjusted.

  7 is a plan view from the outside of the bottom of the rotating drum 5 of the rotating drum 5 of the drum type washing machine in the embodiment of the present invention (as viewed from the drive motor 7 in FIG. 1), and FIG. 3 is a longitudinal sectional view of a main part of a rotating drum 5. FIG.

  Hereinafter, the configuration of the rotating drum 5 that functions as a pump for circulating the wash water in the circulation channel will be described with reference to FIGS.

  The rotating drum bottom 5d is formed in a substantially concave shape by providing a flange portion 5f protruding outward on the outer periphery thereof, and the rear end portion of the rotating drum body 5c and the flange portion 5f are connected by caulking or welding or the like. is doing.

  Inside the flange portion 5f on the outer surface side of the rotating drum bottom portion 5d, there are provided a drum fixing member 35 made of aluminum die cast having three extending portions 35a substantially radially, and between the three extending portions 35a. In addition, a substantially arc-shaped box-shaped rib mounting member 37 formed along the outer periphery of the rotating drum bottom 5d is provided.

As shown in FIG. 7, the drum fixing member 35 fixes the rotating drum 5 with a screw 36 from the outer peripheral direction and a rib mounting member 37 with a mounting screw 39 a from the plane direction. Is connected at the central portion thereof, and transmits the rotation of the drive motor 7 to the rotary drum 5. In FIG. 7, the direction of arrow B is clockwise rotation when viewed from the front side of the housing 1.

  The rib mounting member 37 is formed to have a substantially concave cross section by providing an outer wall 40 and an inner wall 41 protruding rearward on the outer periphery, and a plurality of ribs 38 connecting the outer wall 40 and the inner wall 41 are formed in the inner wall 40 and the outer wall 40. The flow direction of the washing water that is inclined at a predetermined angle toward the flow direction of the washing water rotating in the outer tub 6 as it goes to the outer peripheral side at the same height as the inner wall 41 and rotating in the outer tub 6 It is curved to be convex in the opposite direction.

  About the drum type washing machine comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. FIGS. 9 and 10 are flowcharts of the control means of the drum type washing machine in the embodiment of the present invention and show the control of the washing process. FIG. 9 is a flowchart from the cloth amount determination process to the foam generation process. FIG. 10 is a flowchart from the second water supply process to the shower discharge process, continued from FIG. 9.

(Cloth amount judgment process)
In S100, when the laundry is put into the rotating drum 5 and the operation start is input, the control means 16 reads the control program from the storage means 18 and performs the control operation described below. In S <b> 101, the amount of laundry is detected by rotating the rotary drum 5 by the cloth amount detection unit 12, and the detected amount of laundry is stored in the storage unit 18.

(First water supply process)
Next, in S102, the first water supply valve 9 is opened, water is injected into the rotary drum 5 from the water injection cap portion 10b through the first water supply hose 10a, and the casing is formed at a fifth predetermined rotation speed (for example, 35 r / min). Rotate counterclockwise as viewed from the front side of 1. As described above, since the water injection cap 10b is opened in a slit shape, the injected water spreads in a substantially horizontal direction and sprinkles on the laundry in the rotating drum 5 and penetrates into the laundry. When water is supplied for a fifth predetermined time (for example, 60 seconds) (S103), the first water supply valve 9 is closed and the water supply is stopped in S104.

  Next, in S105, the rotation of the rotating drum 5 is left as it is, the second water supply valve 11 is opened, and water is poured into the detergent case 13c through the second water supply hose 13a. The water flowing into the detergent case 13c passes through the plurality of water injection holes 13e provided on the upper surface of the detergent case 13c, and flows down onto the detergent 13b in a shower-like manner. Thereafter, water flows into the outer tub 6 through the third water supply hose 13d connected to the lower portion of the detergent case 13c together with the detergent 13b.

  In S106, when the water level detection means 14 detects that water has been supplied up to the first water level, in S107, the second water supply valve 11 is closed to stop water supply, and the rotation of the rotary drum 5 is stopped.

(Detergent dissolution process)
Next, in S108, the rotating drum 5 is rotated from the stationary state to the right, and the fourth predetermined rotating speed (the rotating speed at which the laundry is stuck to the inner peripheral surface of the rotating drum 5 by the centrifugal force accompanying the rotation of the rotating drum 5). For example, by gradually accelerating to 80 r / min), the laundry is stuck to the inner peripheral surface of the rotating drum 5 such that the centrifugal force is greater than the gravity acting on the laundry. Then, by rotating the rotating drum 5 for a fourth predetermined time (for example, 30 seconds), the washing water in the outer tub 6 is agitated to dissolve the detergent 13b. By dissolving the detergent in the detergent dissolving step, when the washing water in the outer tub 6 is circulated in the rotating drum 5 in the subsequent step, the detergent 13b is not dissolved in the washing water and is washed into the laundry. It can prevent adhering.

  Here, the rotating drum 5 is rotated at a fourth predetermined rotational speed (for example, 80 r / min) which is a slightly higher rotational speed under conditions where foaming easily occurs depending on the type and amount of detergent, water temperature and amount, and the type and amount of clothing. If it is made, the detergent foam may grow and enter the hot air blowing path 51. When many detergent bubbles enter, the other electrode 53b of the bubble detecting means 53 provided in the hot air blowing path 51 is reached and the bubbles are detected (S109). At this time, detergent foam is frequently generated and the detergent 13b is judged to be sufficiently dissolved, and the remaining detergent dissolving process and the next foam generating process are stopped, and the process proceeds to the next second water supply process (S115). To do.

(Bubble generation process)
Next, in S111, the rotating drum 5 is rotated to the right, and the rotation speed is changed from the fourth predetermined rotation speed to the third predetermined rotation speed (rotation speed higher than the fourth predetermined rotation speed, for example, 120 r / min). The washing power in the outer tub 6 is made to foam by increasing the stirring power to generate detergent foam. At this time, as shown in FIG. 7, the rib 38 formed on the rotating drum bottom 5d is inclined in the clockwise direction, so that the rotating drum 5 rotates clockwise (the arrow B is viewed from the front side of the housing 1). By rotating to the right, the washing water can be scraped more and the washing water can be further foamed. The detergent foam generated in a large amount in this manner fills the space between the outer tub 6 and the rotating drum 5, rises toward the rotating drum opening 5a, and flows into the rotating drum 5 from the rotating drum opening 5a.

  Further, the washing water containing detergent bubbles in the outer tub 6 is stirred and scraped up by the ribs 38, so that the washing water rotates in the vicinity of the boundary between the outer tub main body body 2b and the outer tub main body bottom 2c. It is guided to the guide recess 21 provided in the bottom portion 2 c and taken into the water intake 20, and is discharged from the discharge port 32 into the rotary drum 5 through the first to fourth circulation water channels 22, 26, 27, and 28. As a result, a large amount of washing water containing detergent bubbles can be circulated in the rotating drum 5, and a high concentration detergent solution can be soaked into the laundry.

  In this manner, in S113, the rotating drum 5 is rotated at the third predetermined rotation speed (for example, 120 r / min) for the third predetermined time (for example, 30 seconds) to generate detergent bubbles, and the detergent bubbles are generated in the rotating drum 5. When full, the process proceeds to S114 and the rotating drum 5 is stopped.

  As described above, in the foam generation step (S111 to S114), the detergent component easily acts on the dirt by making the washing water into a foam with a large volume and adhering and penetrating into the laundry in the rotating drum 5, thereby increasing the concentration. This makes it easier for the detergent solution to soak in and prevents uneven washing, improving the cleaning power. In addition, since the washing power can be increased as the washing water containing the detergent foam penetrates into the laundry at an early stage, it is desirable to perform this foam generation process as early as possible.

  Here, when the detergent bubbles are likely to grow and the detergent bubbles enter the hot air blowing path 51 frequently, the detergent bubbles reach the other electrode 53b of the bubble detecting means provided in the hot air blowing path 51 to detect the bubbles. (S112). At this time, it is determined that there are a lot of detergent bubbles, the foam generation process is stopped, and the process proceeds to the next second water supply process (S115).

(Second water supply process)
Next, in S115, the first water supply valve 9 is opened and water is supplied into the rotary drum 5 from the water injection cap 10b through the first water supply hose 10a, and the rotary drum 5 is supplied to the first predetermined rotational speed (into the rotary drum 5). When the stored laundry is lifted in the rotational direction by the rotation of the rotating drum 5 and moves to a height position where the weight of the laundry is higher than the inertia and centrifugal force associated with the rotation, it falls onto the lower inner peripheral surface of the rotating drum 5. When water is supplied to the second predetermined water level while rotating repeatedly in the order of right rotation / pause / left rotation / pause at the first predetermined rotation speed at a rotation speed indicating the behavior (for example, 45 r / min), the first predetermined level is obtained at S117. The water supply valve 9 is closed and water supply is stopped.

(Tapping process)
If the generation of bubbles is not detected in S118, the process proceeds to S119, the first water supply valve 9 is opened, the first water supply hose 10a is opened and water is supplied from the water injection cap portion 10b to the inside of the rotary drum 5 to the first predetermined water level. 5 is repeatedly rotated in the order of right rotation / pause and left rotation / pause at the first predetermined rotation speed at a first predetermined rotation speed (for example, 45 r / min). When water is supplied to the second predetermined water level, the first water supply valve 9 is closed in S121 to stop water supply.

  At this time, by rotating the rotating drum 5 at a first predetermined rotation speed (for example, 45 r / min), the stirring protrusions 5 e provided at a plurality of positions on the inner peripheral surface of the rotating drum 5 are allowed to wash the laundry in the rotating drum 5. Hook and lift in the direction of rotation. Since the lifted laundry is lifted and dropped one after another, the positions are changed one after another, and the laundry is washed with the impact force when dropped while the detergent bubbles penetrate into the laundry as needed. When the rotating drum 5 is rotated for a first predetermined time (for example, 3 minutes and 30 seconds), the process proceeds to the next shower discharge process (S126 to S128).

  Here, in S118, when the detergent bubbles are likely to grow and the detergent bubbles frequently enter the hot air blowing path 51, the bubbles reach the electrode 53b of the bubble detection means provided in the hot air blowing path 51, and the bubbles Detect. At this time, it is determined that there are a lot of detergent bubbles, and the rotation is repeated at the sixth predetermined rotation speed (for example, 30 r / min) at S122 in the right rotation / pause / left rotation / pause at the sixth predetermined rotation speed. The sequence is to rotate. By operating at a very low rotational speed in this manner, the growth of detergent bubbles can be suppressed, and after the sixth predetermined time (for example, 1 minute) has elapsed in S123, the process returns to S124 for the first predetermined time (for example, 3 minutes and 30). If the second) has not elapsed, the bubble detection means 53 detects the bubble entry again. When the first predetermined time (for example, 3 minutes 30 seconds) elapses in S124, the entry of the detergent bubbles is detected by the foam detection means 53 in S125. When the detergent bubbles are detected, the shower discharge process is skipped, and the process proceeds to S129. Since the predetermined time (for example, 25 minutes) has not elapsed, the process returns to S118 and the tapping process is started again.

  Accordingly, when there are many detergent bubbles, the bubble detection means detects the bubbles, and control is performed so that the washing drum is washed without performing the shower discharge process in which the rotating drum 5 rotates at high speed, thereby suppressing the growth of the detergent bubbles. be able to.

  When the detergent foam is not detected in S125, the process proceeds to the next shower discharge process.

(Shower discharge process)
When the rotating drum 5 is rotated to the right at the second predetermined rotation speed (for example, 120 r / min) in S126, the washing water in the outer tub 6 is scraped up by the rib 38 and taken into the water intake 20, The four circulation water passages 22, 26, 27 and 28 are discharged from the discharge port 32 into the rotary drum 5 and circulated in the rotary drum 5. By circulating the washing water, the washing water can penetrate more into the laundry.

  When the rotating drum 5 is rotated for a second predetermined time (for example, 30 seconds), if the seventh required time (for example, 25 minutes) has not elapsed in S129, the process returns to S118 and the tapping process is started again. Thereby, the washing process can be performed in a state where the washing water is sufficiently infiltrated into the laundry in the shower discharge process. As described above, the washing process and the shower discharge process are repeated until a seventh predetermined time (for example, 25 minutes) elapses, and when the seventh predetermined time elapses, the process proceeds to the next rinsing step of S130.

Here, in S127, when the detergent bubbles are likely to grow and when the detergent bubbles are frequently entered into the hot air blowing path 51, the detergent bubbles reach the electrode 53b of the bubble detecting means 53 provided in the hot air blowing path 51. Detect bubbles. At this time, it is determined that there are a lot of detergent bubbles, the shower discharge process is stopped, and the process proceeds to the tapping process of S118. Further, since the bubble is detected in S118, S122
This is a washing sequence with a weak stirring force at the sixth predetermined rotation speed (for example, 30 r / min) of the low-speed rotation.

  Although not described in the operation flowcharts of FIGS. 9 and 10, when the bubble detection means 53 detects bubbles during the execution of the detergent dissolution step or the bubble generation step, the second rotational speed of the shower discharge step. (In this case, for example, 120 r / min), the rotation speed may be lower, for example, 100 r / min, or the second predetermined time (in this case, for example, 30 seconds) may be shortened to, for example, 20 seconds. According to this configuration, it is possible to suppress the amount of foam generated in the shower discharge process, and it is not necessary to detect bubbles in a mischievous manner, and the subsequent washing sequence does not have to be a washing sequence with a lower agitation force than normal washing. Power can be secured and the washing time does not have to be extended unnecessarily.

  After performing the above washing process (S100-S129), a rinse process and a dehydration process are performed.

  As described above, in the drum type washing machine of the present invention, the washing water and the shower discharge process are repeatedly performed, so that the washing water can be circulated and more washing water can penetrate into the laundry. Washing can be performed in a state where water is sufficiently infiltrated, so that the cleaning power can be improved and washing unevenness can be reduced as compared to the case where the washing water is insufficiently penetrated. Can do.

  In addition, the washing power can be increased without increasing the water level in the outer tub 6 by circulating the washing water. Furthermore, the time for obtaining the same cleaning effect is shortened, and the cleaning time can be shortened.

  Further, when excessive detergent bubbles are generated in the outer tub 6, the detergent bubbles are detected when the detergent bubbles enter the hot air blowing path 51 and reach the position of the electrode 53 b of the bubble detecting means 53. By detecting the foam, the control for suppressing the generation of the foam as described above not only prevents the cleaning effect of the tapping washing from being deteriorated, but also generates a detergent foam and from the position of the electrode 53b of the foam detection means 53 Furthermore, it is possible to prevent the detergent bubbles from entering into the hot air blowing path 51 and adhering to the electric parts such as the blower fan 45 and the heater 44 and causing problems such as deterioration of insulation and failure. it can.

  In this embodiment, the detergent dissolution process, the foam generation process, the tapping washing process, and the shower discharge process are performed in the washing process, but the tapping washing process and the shower discharge process may be performed without performing the foam generation process. In the shower discharge process, the washing water in the outer tub 6 is circulated into the rotary drum 5 through the discharge port 32, and the washing power is improved by thoroughly washing the washing water into the laundry. You can also.

  In the present embodiment, the case where the other electrode 53b of the foam detection means 53 is provided in the hot air blowing path 51 has been described. However, the position where the foam detection means 53 is provided is the amount of washing foam in the outer tub 6. As long as the position can be detected, the rotation direction of the rotary drum 5 in each step may be determined according to the position. Further, the rotation direction of the rotary drum 5 in each step may be determined regardless of the bubble detection means 53.

  In this embodiment, a drum type washing machine having a drying function has been described. However, a drum type washing machine having no drying function can achieve the same effect.

  Further, the shape of the rib 38 is not limited to the shape described in the present embodiment, and it is desirable that the shape of the washing water is scraped, but the washing water can be circulated without providing the rib 38. For example, the rib 38 may not be provided.

  Further, the water intake 20, the first to fourth circulation water channels 22, 26, 27, 28 and the discharge port 32 are not limited to the configuration described in the first embodiment, and the water intake 20 is the washing water in the outer tub 6. The first to fourth circulation channels 22, 26, 27, and 28 can flow the wash water taken from the water intake 20 to the discharge port 32, and the discharge port 32 is the laundry taken from the water intake 20. Any configuration is possible as long as water can be discharged into the rotating drum 5.

  As described above, the drum type washing machine according to the present invention can perform washing by shower discharge without using a circulation pump, so that it is possible to improve washing power and reduce washing unevenness. In addition, the generation of detergent foam due to the circulation of washing water is reduced to prevent the detergency from deteriorating, and the influence of foam deterioration on the electrical components is eliminated, so that the rotating drum is rotated not only in the washing machine. However, it can be widely applied to various devices and apparatuses that perform cleaning.

Sectional drawing of the drum-type washing machine in embodiment of this invention Side cross-sectional view showing a circulation ventilation path for blowing air into the outer tub Block diagram showing the circuit configuration of the control device Perspective view of the outer tank body Perspective view of the outer tank cover (A) Front view of the circulation nozzle (b) Plan view of the circulation nozzle (c) Side sectional view of the circulation nozzle Plan view from the outside of the bottom of the rotating drum Longitudinal sectional view of the main part Operation flowchart of the control means The operation flowchart of the control means following FIG. Sectional drawing which shows the structure of the conventional drum type washing machine

DESCRIPTION OF SYMBOLS 1 Housing | casing 3a 1st opening part 5 Rotary drum 5a 2nd opening part 6 Outer tank 7 Drive motor 9 Water supply means 16 Control means 20 Water intake 22 1st circulation water path 26 2nd circulation water path 27 3rd circulation water path 28 Fourth circulating water channel 32 Discharge port 53b Bubble detection means

Claims (5)

A casing, a bottomed cylindrical outer tub enclosed in the casing and having a first opening for entering and exiting clothing, and a first opening that corresponds to the first opening and is rotatably included in the outer tub. A bottomed cylindrical rotary drum having two openings and a horizontal axis or a rotary shaft inclined from the horizontal direction , a drive motor for rotating the rotary drum, water supply means for supplying water into the outer tub, and the outer A water intake provided in a tub, into which washing water that rotates in the outer tub as the rotary drum rotates enters, a circulation water channel that communicates with one end of the water intake, and the other end of the circulation water channel communicate with the rotation. A discharge port for discharging washing water into the drum, foam detection means comprising at least one of the electrodes provided above the water level during operation in the outer tub, the drive motor, the water supply means, etc. Control hand to execute each process such as washing, rinsing With the door, the control means, by rotating the rotary drum at a first predetermined rotational speed, and washed by dropping from lift appropriate height in the direction of rotation of the laundry due to the rotation of said rotary drum The tapping process is performed for a first predetermined time, and the laundry is rotated at a second predetermined rotation speed higher than the first predetermined rotation speed, whereby the laundry is centrifugally applied to the inner peripheral wall of the rotation drum. shower discharge step of discharging the wash water from the discharge port causes stick performs a second predetermined time, and executes the bashing washing step and the shower discharge process alternately, the bubble detecting means detects the bubble The drum-type washing machine is configured to execute the tapping process without performing the shower discharge process. When the bubble detection means detects bubbles during the shower discharge process, the control means immediately stops the shower discharge process and shifts to the tapping process, and the tapping process after the transfer detects the bubbles. The drum-type washing machine according to claim 1, wherein the washing sequence is a washing sequence in which the stirring force is weaker than that when the means detects no bubbles. The control means includes a foam generating step of foaming the washing water in the outer tub by rotating the rotating drum at a third predetermined rotational speed higher than the first predetermined rotational speed before the tapping process and the shower discharging step. And when the bubble detection means detects bubbles during execution of the bubble generation step, the bubble generation step is immediately stopped and the process proceeds to the water supply step of the next step. Drum type washing machine. The control means has a detergent dissolution step for dissolving the detergent in the outer tub by rotating the rotary drum at a fourth predetermined rotation speed higher than the first predetermined rotation speed of the tapping process before the foam generation step. When the foam detection means detects foam during the execution of the detergent dissolution process, the detergent dissolution process is immediately stopped and the foam generation process of the next process is also stopped and the process proceeds to the next water supply process. The drum type washing machine according to any one of claims 1 to 3. When the foam detection means detects the foam during the detergent dissolution process or the foam generation process, the control means is configured to change the second rotational speed of the shower discharge process to a low value or to shorten the second predetermined time. The drum type washing machine according to any one of claims 1 to 4.