JP5836550B2 - Washing machine - Google Patents

Description

  The present invention relates to a washing machine including a drainage filter that captures dust such as lint.

  The washing machine is configured by supporting a bottomed cylindrical washing tub in a housing in a vertical posture, a horizontal posture or an oblique horizontal posture, and connecting a drainage channel to the bottom of the washing tub. A drainage valve is provided in the drainage channel. As a drain valve, an electromagnetic valve that is normally opened when energized is used from the viewpoint of reducing operating costs. Washing is performed by closing the drain valve, putting the laundry into a washing tub (or a rotating drum if a rotating drum is provided in the washing tub), and rotating the washing tub or the rotating drum in a state where water is stored. Then, after the washing is finished, the drain valve is opened to drain the washing water. Since wastewater contains waste such as lint from laundry, there is a problem that waste is discharged into the sewage together with the wastewater, increasing the environmental load. In order to solve this problem, recent washing machines are equipped with a drainage filter. The drainage filter is detachably provided in the middle of the drainage channel, captures the dust in the drainage flowing through the drainage channel, and prevents the waste from being discharged into the sewage.

  As the washing machine is used, the amount of dust trapped in the drainage filter increases and the drainage filter becomes clogged with waste. The user needs to periodically inspect and clean the drainage filter. However, the user may forget to clean.

Accordingly, a washing machine has been proposed that is configured to detect clogging of the drainage filter and includes means for notifying the clogging when it is detected (for example, Patent Document 1).
This washing machine includes a water level sensor that detects the level of the washing water in the washing tub, and determines whether the drainage filter is clogged based on the amount of change in the water level detected by the water level sensor during drainage. If the drainage filter is clogged, the drainage is interrupted and a “drainage error” is displayed. The user can take out the drainage filter by looking at this display and clean it reliably.

JP 2007-111097 A

  However, when the above-described clogging occurs, sufficient drainage cannot be performed, so that water remains in the drainage channel. Accordingly, when the drainage filter is taken out, there is a problem that drainage overflows outside the machine and the periphery of the washing machine becomes dirty. When the amount of remaining water is large, there are cases where it cannot be dealt with by placing a water receiver or a towel under the opening for taking out the drainage filter.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a washing machine in which drainage is prevented from overflowing outside the machine when the drainage filter is clogged and the drainage filter is removed.

  The washing machine according to the present invention is provided with a housing, a washing tub provided in the housing, a drain passage connected to the washing tub and having a drain valve, and detachably provided upstream from the drain valve. A drainage valve that opens the drainage valve when the clogging determination means determines that the drainage filter is clogged. An opening means is provided.

  In the present invention, when the drainage filter is clogged and the drainage filter is removed, since the drainage valve is open, most of the washing water collected in the drainage channel flows downstream of the drainage channel, and the drainage overflows outside the machine. It is suppressed from taking out.

  The washing machine according to the present invention is characterized by comprising notifying means for notifying clogging of the drainage filter when the drainage valve is opened by the drainage valve opening means.

  In the present invention, when the user is notified that the drainage filter is clogged and prompted to remove the drainage filter, the drainage valve can be opened.

  The washing machine according to the present invention includes detection means for detecting attachment / detachment of the drainage filter, and the drainage valve opening means detects the drainage valve when the detection means detects that the drainage filter has been removed. And a means for closing the drain valve when the detection means detects that the drain filter is attached.

  In the present invention, after the drain valve is opened and cleaned at the timing when the user exactly takes out the drain filter, the drain valve is attached and the drain valve is closed when it is not necessary to open the drain valve. Therefore, the operating cost can be reduced when the drain valve is configured to be opened by energization without unnecessarily opening the drain valve.

  The washing machine according to the present invention includes a water level sensor that detects a water level of the washing water in the washing tub, and the clogging determination unit is clogged with the drainage filter based on the amount of change in the water level detected by the water level sensor. It is characterized by determining the presence or absence of.

  In the present invention, the clogging of the drainage filter can be easily determined using a water level sensor that detects the water level during the washing operation.

  In the washing machine according to the present invention, the drain valve opening means opens the drain valve when the amount of change in the water level detected by the water level sensor is less than a first threshold, and the amount of change in the water level is the first amount. In the case where the drainage filter is greater than or equal to the threshold and less than the second threshold greater than the first threshold, the drainage filter is provided with means for extending the drainage time compared to when the drainage filter is not clogged.

  In the present invention, when the amount of clogged drainage filter is small, drainage can be completed longer than when the drainage filter is not clogged, that is, drainage can be continued without stopping operation. , User convenience is good. Since the drainage filter is clogged and the drainage valve is opened when operation is stopped, the drainage can be reliably prevented from overflowing from outside the machine when the drainage filter is removed.

  The washing machine according to the present invention includes a filter case that accommodates the drainage filter so that the drainage filter can be freely inserted into and removed from the housing, and the filter case is arranged so that an outside in a direction in which the drainage filter is pulled out is higher than the other side. It is characterized by being.

  In the present invention, the filter case is arranged so that the outer side in the direction of extracting the drainage filter is higher than the other side, so that the drainage is prevented from overflowing from the outlet of the drainage filter due to the height difference.

  According to the present invention, when the drainage filter is clogged and the drainage filter is removed, the drainage is prevented from overflowing outside the machine.

1 is a perspective view schematically showing an appearance of a washing machine according to an embodiment of the present invention. 1 is a longitudinal sectional view schematically showing an internal configuration of a washing machine according to an embodiment of the present invention. It is an expansion perspective view of a filter case and a drain valve. It is an expanded sectional view of a filter case and a drain valve. It is an expanded sectional view showing the state where the drainage filter was extracted from the filter case. It is a control block diagram of a washing machine. It is a flowchart which shows the procedure of the waste water treatment by an operation control part.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
FIG. 1 is a perspective view schematically showing an appearance of a washing machine 100 according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view schematically showing an internal configuration of the washing machine 100. The washing machine 100 includes a drying air passage and is configured to perform a drying operation. In addition, the washing machine of this invention is not limited when providing a dry air path.

  As shown in FIG. 2, the washing machine 100 includes a washing tub 2 and a rotating drum 3 inside a housing 1 that constitutes an exterior. The washing tub 2 has a large-diameter bottomed cylindrical shape having an opening 20 provided over the entire surface on one end side, and a plurality of support legs 21 (only one) erected on the bottom surface of the housing 1. As shown in the figure, the elastic body is elastically supported in an oblique lateral posture with the opening 20 side facing upward. The washing tub 2 may be supported in a vertical posture or a horizontal posture.

  On the front surface of the housing 1 (left side surface in FIG. 2), a laundry inlet 11 is opened at a position facing the opening 20 of the washing tub 2 so as to be opened and closed by the lid 10. And the opening 20 of the washing tub 2 are sealed in a liquid-tight manner by the bellows 12. As shown in FIG. 1, a door opening button 13 is provided near the lid 10 on the front surface of the housing 1. The lid 10 is opened by operating the door opening button 13.

  The rotating drum 3 has a bottomed cylindrical shape slightly smaller in diameter than the washing tub 2, and a bottom surface is fixed to the end of the output shaft 40 of the drum motor 4 fixed at the center of the bottom of the washing tub 2. The part 30 is supported in a state where it faces the inside of the opening 20 of the washing tub 2. The rotating drum 3 supported in this manner is rotated inside the washing tub 2 by driving of the drum motor 4. A large number of small holes 32 are formed through the entire surface of the peripheral wall of the rotary drum 3, and a plurality of baffles 33 extending in the axial direction are provided on the inner surface of the peripheral wall so as to be evenly spaced in the peripheral direction. Has been. In FIG. 2, a part of the large number of small holes 32 and one baffle 33 are illustrated.

  As shown in FIG. 1, an operation panel 15 including an operation unit for various operations and a display unit for various displays is provided on the upper front of the housing 1. The operation panel 15 is connected to an operation control unit 16 (see FIG. 2) provided inside the upper portion of the housing 1. The washing machine 100 performs a washing operation, a dehydrating operation, and a drying operation by the operation of the operation control unit 16 according to the operation of the operation panel 15.

  As shown in FIG. 1, a connection portion 50 that can be connected to a water supply source such as water supply is provided on the upper surface of the rear portion of the housing 1. As shown in FIG. 2, the connection portion 50 is connected to a water supply valve 51 provided inside the housing 1. The water supply valve 51 is a multiple solenoid valve having a plurality of water supply outlets, and switches between a plurality of switching positions including a closed position in accordance with a command from the operation control unit 16.

  A first water supply outlet of the water supply valve 51 is connected to a water supply opening that opens on the upper peripheral surface of the washing tub 2 via a water supply pipe 52. When the water supply valve 51 is switched to the first water supply outlet, the water from the water supply source is fed into the washing tub 2 through the water supply pipe 52. The water supply pipe 52 extends forward along the upper part of the washing tub 2, is connected to a known detergent case, and is configured to send an appropriate amount of detergent stored in the detergent case into the washing tub 2 together with water supply. May be.

  The second water supply outlet of the water supply valve 51 is connected to the front lower part of the washing tub 2 via the cooling water pipe 55. In the washing tub 2, a concave groove 22 extending in the axial length direction is formed on the lower peripheral surface, and a cooling plate 23 is installed so as to cover the upper portion of the concave groove 22. The cooling plate 23 is inclined with the rear part at the bottom, and a plurality of recesses are arranged in parallel on the upper surface.

  A drain port 24 is provided at the rear end of the groove 22, that is, the lowest part of the washing tub 2, and one end of a drain pipe 81 is connected to the drain port 24 via a drain unit 80. Yes. The drain pipe 81 extends in the front-rear direction of the housing 1, and the other end of the drain pipe 81 is connected to a connection portion 82 a provided at a substantially central portion of the filter case 82. A recess 17 is provided at the front lower portion of the housing 1 in a tilted state with the front side up, and the filter case 82 has an end abutting against the back surface of the bottom surface of the recess 17 and is inclined with the front side up. It is being fixed to the bottom front part of the housing | casing 1 in the state. In the filter case 82, a drainage filter 83 that captures dust such as lint is accommodated in the recess 17 so as to be removable from the machine. Note that the present invention is not limited to the case where the filter case 82 is provided in an inclined state.

A drain valve 84 is connected to the rear end of the filter case 82. The drain valve 84 is fixed to the bottom front portion of the housing 1. One end of a drain hose 85 is connected to the lower side of the drain valve 84. The drainage hose 85 extends along the front and back of the bottom surface of the housing 1, and the other end projects from the housing 1 and is connected to a drainage groove (not shown) connected to the sewer pipe.
A circulation pump 86 is connected to the lower side of the substantially central portion of the filter case 82. A return pipe 91 is connected to the circulation pump 86, and the return pipe 91 extends upward along the front portion of the washing tub 2 and is connected to a nozzle 92 provided at the peripheral edge of the opening 20 of the washing tub 2. The washing water in the filter case 82 is fed to the upper part of the washing tub 2 through the return pipe 91 by the driving of the circulation pump 86, and is jetted into the rotating drum 3 from the nozzle 92.
A filter sensor 93 that detects insertion / removal of the drainage filter 83 is attached to the front upper end of the filter case 82. The filter sensor 93 is, for example, a limit switch, and is configured such that the switch is turned off / on according to the insertion / extraction of the drainage filter 83 and a signal is sent to the operation control unit 16.

An air trap 88 is connected to the drainage section 80, and a water level sensor 89 is attached to the air trap 88. When the drain valve 84 is closed and the washing water fills the filter case 82 and the drain pipe 81, air remains in the air trap 88. When the water is supplied from the water supply pipe 52, the pressure of the air increases according to the increase in the level of the washing water in the washing tub 2. The water level sensor 89 detects the air pressure in the air trap 88 and sends a detection signal corresponding to the air pressure to the operation control unit 16. The operation control unit 16 recognizes the water level of the washing water based on the detection signal of the water level sensor 89.
When the drain valve 84 is opened, the washing water in the washing tub 2 is discharged to the drain hose 85 through the drain pipe 81 and the filter case 82.

3 is an enlarged perspective view of the filter case 82 and the drain valve 84, FIG. 4 is an enlarged sectional view of the filter case 82 and the drain valve 84, and FIG. 5 is an enlarged sectional view showing a state in which the drain filter 83 is extracted from the filter case 82. is there.
The filter case 82 is made of synthetic resin. A main body 821 of the filter case 82 has a rectangular tube shape, and a cylindrical portion 82 e having a cross-sectional dimension larger than that of the main body 821 is connected to an end of the main body 821. A rectangular plate-like flange portion 82f is provided outside the cylindrical portion 82e.
The filter case 82 is fixed to the bottom surface of the housing 1 in an oblique posture as described above by the support legs 82c and 82d provided side by side in the longitudinal direction of the side surface of the main body 821. The connecting portion 82a protrudes from the center of the upper surface of the main body 821, and the drain pipe 81 is connected to the connecting portion 82a. A connecting portion 82b protrudes below the center of the side surface of the main body 821, and a circulation pump 86 is connected to the connecting portion 82b.

The drainage filter 83 is made of synthetic resin, and has a handle 83a having a larger diameter than that of the main body 831 connected to the end of a cylindrical main body 831 having a large number of meshes. The filter case 82 has an inner surface shape into which the drainage filter 83 can be fitted.
Since it is configured as described above, the user can insert his / her drain filter 83 from the filter case 82 by holding his / her handle portion 83 a and inserting his / her hand into the recess 17. The recess 17 is provided with a lid, and the user opens and closes the drainage filter 83 by opening the lid.

The drain valve 84 is fixed to the bottom surface of the housing 1 in a state of projecting laterally from the filter case 82 (in a state orthogonal to the filter case 82) by support legs 84d and support legs 84e arranged in parallel in the longitudinal direction. . A connecting portion 84 a provided on the left side of the columnar main body 841 is connected to the rear end portion of the side surface of the main body 821 of the drainage filter 82 via the connecting pipe 90. A connecting portion 84f is provided on the upper side of the main body 841, and an overflow pipe (not shown) for sending the washing water overflowing from the washing tub 2 is connected to the connecting portion 84f. A connecting portion 84c is provided on the lower side of the main body 841, and the drainage hose 85 is connected to the connecting portion 84c.
A connecting portion 84b is provided on the right side of the main body 841, and a solenoid actuator (not shown) is connected to the connecting portion 84b. The drain valve 84 is an electromagnetic valve that is energized by a solenoid actuator and generates a magnetic field to open the valve.

  The washing machine 100 according to the present embodiment includes a drying air path for circulating the drying air (see FIG. 2). The drying air path extends along the bottom surface of the washing tub 2 and has a lead-out duct 60 and an introduction duct 61 that are integrally formed with the washing tub 2. The lower end portion of the lead-out duct 60 communicates with a lead-out port 62 that opens into the washing tub 2 at the rear position of the cooling plate 23. The upper end portion of the outlet duct 60 communicates with the outlet pipe 63 that protrudes upward from the upper peripheral surface of the washing tub 2.

  An upper end portion of the introduction duct 61 communicates with an introduction pipe 64 that protrudes upward from the upper peripheral surface of the washing tub 2. Further, the output shaft 40 of the drum motor 4 protrudes at the lower end portion of the introduction duct 61, and an introduction port 65 having a circular cross section that opens toward the inside of the washing tub 2 is opened coaxially with the protrusion portion. .

On the upper part of the washing tub 2, a blower fan 70 for raising dry air is disposed. The blower fan 70 is unitized with a filter 71 on the suction side and a heater 72 on the discharge side, and is fixedly supported inside the housing 1. The end of the outlet pipe 63 protruding from the upper part of the washing tub 2 is connected to the suction side of the blower fan 70, and the end of the introduction pipe 64 is connected to the discharge side of the blower fan 70.
In addition, you may decide to provide the said unit with the ion generator for generating ion with dry air.

FIG. 6 is a control block diagram of the washing machine 100 configured as described above.
The operation control unit 16 includes a CPU (Central Processing Unit) 161, a ROM 162 that stores a control program for controlling the entire washing machine 100, and a microcomputer (microcomputer) that includes a RAM 163 as a work area. The CPU 161 reads the control program stored in the ROM 162 onto the RAM 163, and executes the control program while temporarily storing the data being processed in the RAM 163.

  The operation control unit 16 receives a detection signal from the water level sensor 89 and the filter sensor 93 and a signal from an operation key on the operation panel 15. In addition to the display signal for the operation panel 15, the operation control unit 16 outputs drive signals for the drum motor 4, the blower fan 70, the heater 72, the drain valve 84, the water supply valve 51, the circulation pump 86, and the buzzer 95. . As will be described later, the operation control unit 16 is configured to sound a buzzer 95 when it is determined that the drainage filter 83 is in a severely clogged state.

  In the washing operation, the user opens the lid 10, puts the laundry into the rotary drum 3 through the openings 20 and 30 located inside the insertion slot 11, closes the lid 10, and then the operation control unit 16. Is started by switching the water supply valve 51 to the first water supply outlet and supplying water from the water supply pipe 52 to the inside of the washing tub 2.

During the water supply, the drain valve 84 is closed, and the wash water supplied to the inside of the washing tub 2 enters the filter case 82 through the drain pipe 81, fills the filter case 82 and the drain pipe 81, and then performs washing. It collects inside the tank 2. The water level sensor 89 detects the air pressure in the air trap 88 as described above, and sends a detection signal corresponding to the air pressure to the operation control unit 16. The operation control unit 16 recognizes the water level of the washing water based on the detection signal of the water level sensor 89.
When the operation control unit 16 determines that the water level of the washing water has reached a predetermined value, the operation control unit 16 drives the drum motor 4 to rotate the rotating drum 3. As described above, the rotating drum 3 includes a large number of small holes 32 and a plurality of baffles 33, and water enters the rotating drum 3 through the small holes 32. The laundry in the rotating drum 3 is washed by being repeatedly lifted and dropped by the baffle 33.

  The circulation pump 86 connected to the filter case 82 is driven continuously or intermittently during the washing operation. By this driving, the washing water in the filter case 82 is sucked into the circulation pump 86 and pressurized, and is fed to the upper part of the washing tub 2 through the return pipe 91 and from the nozzle 92 connected to the tip of the return pipe 91. Sprayed onto the laundry in the rotating drum 3. As described above, the washing water is circulated from the washing tub 2 through the filter case 82 and back into the rotary drum 3, so that washing is performed efficiently with a small amount of water. Waste such as lint contained in the circulating washing water is captured and removed by the drainage filter 83 accommodated in the filter case 82, and clean washing water is poured into the drum 3 through the return pipe 91. It is.

After the above washing operation, the operation control unit 16 stops the rotation of the rotary drum 3 and opens the drain valve 84 provided at the lower part of the filter case 82. By opening the drain valve 84, the washing water in the washing tub 2 is discharged to the drain hose 85 through the drain pipe 81 and the filter case 82. During this drainage, the waste contained in the wash water is captured by the drainage filter 83 in the filter case 82, so that there is no possibility that the waste will be discharged outside the machine via the drainage hose 85, and the environmental load can be reduced. It is illustrated.
After the drainage is completed, the operation control unit 16 rotates the rotary drum 3 to perform the dehydration operation. The water contained in the laundry is spun off by the centrifugal force due to the rotation of the rotating drum 3, flows out of the washing tub 2, and is discharged to the drain hose 85 through the drain pipe 81 and the filter case 82.

  After dehydration, the operation control unit 16 drives the blower fan 70, operates the heater 72, drives the drum motor 4, and repeatedly rotates the rotating drum 3 at a low speed to perform a drying operation. At this time, the water supply valve 51 is switched to the second water supply outlet, and the cooling water flows on the cooling plate 23. By driving the blower fan 70, the drying air is sucked and pressurized from the outlet pipe 63 connected to the suction side, heated by the heater 72, and passed to the introduction duct 61 through the introduction pipe 64 connected to the discharge side. Sent out. The drying air sent into the introduction duct 61 flows from the outer periphery of the washing tub 2 toward the center, reaches the introduction port 65, and is introduced into the rotary drum 3. The drying air introduced into the rotary drum 3 flows out into the washing tub 2 through a large number of small holes 32 formed in the peripheral wall, is led out into the lead-out duct 60 through the lead-out port 62, and is sent to the blower fan 70. It is sucked again.

  The laundry inside the rotating drum 3 is repeatedly lifted and dropped by the rotation of the rotating drum 3. The drying air introduced into the rotary drum 3 hits the laundry in the rotary drum 3, deprives the laundry of moisture, flows out into the washing tub 2, and opens to the bottom bottom of the laundry tub 2. It flows toward. The drying air flowing in this manner is cooled in contact with the cooling water on the cooling plate 23, reaches the outlet 62 as the low-humidity drying air from which the contained water is condensed and removed, and is sent out into the outlet duct 60. The drain valve 84 is open during the drying operation, and the condensed and removed water flows on the cooling plate 23 together with the cooling water to the rear side, reaches the rear end portion, flows down into the concave groove 22, and drains 81 and The water is drained into the drainage hose 85 through the filter case 82.

  The low-humidity dry air rises in the lead-out duct 60, is sucked into the blower fan 70 through the lead-out pipe 63, is pressurized, is heated again by the heater 72, and descends in the lead-in duct 61 as high-temperature and low-humidity hot air. Then, it is introduced into the rotary drum 3. Since the laundry in the rotary drum 3 is repeatedly lifted and dropped by the rotation of the rotary drum 3 as described above, the contact with the drying air circulating with cooling and heating is repeated, and the laundry is efficiently dried. .

Hereinafter, drainage will be described in detail.
FIG. 7 is a flowchart showing the procedure of wastewater treatment by the operation control unit 16. The operation control unit 16 includes a timer (not shown).
First, the operation control unit 16 starts counting the timer from the start point of the wastewater treatment, and opens the drainage valve 84 (S1).
And the operation control part 16 acquires the water level data of washing water with a predetermined sampling period by the water level sensor 89 (S2).
Next, the operation control unit 16 calculates a water level change amount (drainage speed) per hour based on the acquired plurality of water level data (S3). Examples of the water level change amount include an average value of a plurality of water level change amounts obtained based on a difference in water level data at successive sampling points, a water level change amount at a predetermined number of sampling points, and the like.

  The operation control unit 16 determines whether or not the calculated water level change amount is greater than or equal to the second threshold value a (S4). If the operation control unit 16 determines that the water level change amount is equal to or greater than the second threshold value a (S4: YES), the drainage is proceeding smoothly, and the process proceeds to step S5. In step S5, the operation control unit 16 determines whether or not a preset drainage time has elapsed (S5). This drainage time is obtained by adding a predetermined additional time to the time required from the start to the end of drainage when the drainage filter 83 is not clogged at all. When it is determined that the drainage time has not elapsed (S5: NO), the operation control unit 16 repeats the determination process. When it is determined that the drainage time has elapsed (S5: YES), the operation control unit 16 closes the drainage valve 84 (S6) and ends the drainage process.

  When the operation control unit 16 determines in step S4 that the calculated water level change amount is not greater than or equal to the second threshold value a, that is, less than the second threshold value a (S4: NO), the water level change amount is greater than or equal to the first threshold value b. It is determined whether or not there is (S7). The first threshold value b is smaller than the second threshold value a. When the operation control unit 16 determines that the amount of change in the water level is equal to or greater than the first threshold value b (S7: YES), it indicates that the drainage filter 83 is clogged in the operation panel 15 (here, it is in a slightly clogged state). Display (S8). Since the clogging is slight, the user does not need to remove the drainage filter 83 and clean it, and it is sufficient if the set drainage time is lengthened, and the drainage time is corrected by adding a predetermined time to the drainage time ( S9), the process proceeds to step S5. In this case, in step S5, it is determined whether or not the corrected drainage time has elapsed.

  When the operation control unit 16 determines that the water level change amount is not equal to or greater than the first threshold value b, that is, less than the first threshold value b (S7: NO), the operation is stopped and the drainage filter 83 is clogged in the operation panel 15. (In this case, it is a severely clogged state) is displayed and a buzzer 95 is sounded to give an alarm (S10). Since the operation is stopped, the drain valve 84, which is an electromagnetic valve, is closed. When the user recognizes the alarm, in order to clean the drainage filter 83, the user inserts his hand into the recess 17, holds the handle 83a, and pulls out the drainage filter 83 to the outside.

  The operation control unit 16 determines whether or not the drainage filter 83 has been extracted, that is, whether or not a detection signal corresponding to extraction of the drainage filter 83 has been input by the filter sensor 93 (S11). If the operation control unit 16 determines that the drainage filter 83 has not been extracted (S11: NO), the determination process is repeated. If it is determined that the drainage filter 83 has been extracted (S11: YES), the operation control unit 16 opens the drainage valve 84 (S12).

Next, the operation control unit 16 determines whether or not the drainage filter 83 is inserted by the filter sensor 93, that is, whether or not a detection signal corresponding to insertion of the drainage filter 83 is input by the filter sensor 93 (S13). ). When it is determined that the drainage filter 83 is not inserted (S13: NO), the operation control unit 16 repeats the determination process.
When it is determined that the drainage filter 83 is inserted (S13: YES), the operation control unit 16 cancels the operation stop (S14), advances the process to step S6, closes the drain valve 84, and ends the drainage process.

  In the washing machine 100 according to the present embodiment configured as described above, it is determined that the drainage filter 83 is severely clogged, the user is prompted to extract the drainage filter 83 by an alarm, and the user removes the drainage filter 83 from the outside of the machine. Since the drain valve 84 is opened when the water is extracted, most of the washing water accumulated in the drain pipe 81 and the filter case 82 flows to the drain hose 85 side, and the washing water is prevented from overflowing from the concave portion 17 of the housing 1. Has been. In addition, since the filter case 82 is provided in an inclined state with the outside facing up, the overflow of the washing water from the recess 17 is further suppressed.

  In the present embodiment, when it is detected that the drainage filter 83 has been extracted, the drainage valve 84 is opened, and after the user has cleaned the drainage filter 83, it is detected that the drainage filter 83 has been inserted. When it is no longer necessary to open the drain valve 84, the drain valve 84 is closed, so that the time for energization to open the drain valve 84 can be shortened, and the operating cost can be reduced. Alternatively, the drain valve 84 may be opened at the time when a warning is given that the state is severely clogged, so that the drainage does not overflow from the recess 17 when the drainage filter 83 is extracted.

  Further, in this embodiment, when the drainage filter 83 is small and does not need to be cleaned, the drainage time can be made longer than when the drainage filter 83 is not clogged so that drainage can be completed. The user's convenience is good without unnecessarily interrupting drainage.

  The embodiment disclosed this time is to be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Case 2 Washing tub 3 Rotating drum 4 Drum motor 24 Drain port 52 Water supply pipe 60 Derivation duct 61 Introduction duct 70 Blower fan 71 Filter 72 Heater 80 Drain part 81 Drain pipe 82 Filter case 821, 831, 841 Main body 82a, 82b, 84a, 84b, 84c, 84f Connection part 82c, 82d, 84d, 84e Support leg 83 Drainage filter 83a Handle part 84 Drain valve 85 Drain hose 86 Circulation pump 88 Air trap 89 Water level sensor 90 Connection pipe 93 Filter sensor 100 Washing machine

Claims (6)

A housing, a washing tub provided in the housing, a drainage channel connected to the washing tub and having a drainage valve, a drainage filter provided detachably upstream of the drainage valve, and the drainage filter In a washing machine comprising clogging determining means for determining the presence or absence of clogging,
A washing machine comprising drainage valve opening means for opening the drainage valve when the clogging determination means determines that the drainage filter is clogged.   The washing machine according to claim 1, further comprising a notification unit that notifies clogging of the drainage filter when the drainage valve is opened by the drainage valve opening unit. Comprising detection means for detecting attachment and detachment of the drainage filter;
The drain valve opening means opens the drain valve when the detection means detects that the drain filter is removed,
The washing machine according to claim 1 or 2, further comprising means for closing the drain valve when the detection means detects that the drain filter is attached. A water level sensor for detecting the level of washing water in the washing tub;
The said clogging determination means determines the presence or absence of clogging of the said drainage filter based on the variation | change_quantity of the said water level detected by the said water level sensor, Washing | cleaning of any one of Claim 1 to 3 characterized by the above-mentioned. Machine. The drain valve opening means opens the drain valve when the amount of change in the water level detected by the water level sensor is less than a first threshold,
When the amount of change in the water level is greater than or equal to the first threshold value and less than a second threshold value greater than the first threshold value, a means for extending the drainage time than when the drainage filter is not clogged is provided. The washing machine according to claim 4. A filter case for detachably storing the drainage filter outside the housing;
The washing machine according to any one of claims 1 to 5, wherein the filter case is arranged so that an outer side in a direction of extracting the drainage filter is higher than the other side.

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