JP2008110002A - Drum type washing-drying machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drum type washing-drying machine suppressing foaming by estimating the foaming according to a detergent concentration, and at the same time, suppressing the entering of foams into a drying air passage in which drying air circulates. <P>SOLUTION: This drum type washing-drying machine includes the air flow passage for drying in which the drying air flowing in the rotary drum circulates, a water draining port which is provided at bottom part on the back side of an external tub, and a water draining passage which communicates with the water draining port through a water draining valve. The drying air flow passage has a feeding-out port section which is provided at the upper part on the front side of the external tub and discharges the drying air to the rotary drum, and a flow-in port section through which the drying air having discharged from the rotary drum flows in. In addition, the drying air flow passage has a dehumidifier, an air blowing fan, a drying filter, and a heater being arranged there. The drying air flow passage also has a first conductivity sensor which is installed in the vicinity of the water draining port and senses the conductivity of washing water, and a second conductivity sensor which is installed in the drying air flow passage at a higher position than the flow-in port section, and senses foams which enter the air flow passage for drying. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drum-type washing / drying machine, and particularly relates to measures against foam generated from washing water.

  A drum-type washing / drying machine that detects bubbles with two conductivity sensors is described in Japanese Patent Application Laid-Open No. 2006-136601 (Patent Document 1).

JP 2006-136601 A

  In the drum type washing and drying machine, the washing water used at the time of washing is much less than about 62 liters of the vertical washing machine, about 25 liters, and the detergent is used in proportion to the amount of laundry, so Since the ratio of the detergent amount is increased and the detergent concentration is increased, bubbles are easily generated during washing and dehydration.

  In the drum-type washing / drying machine disclosed in Patent Document 1, the countermeasure against foaming according to the detergent concentration is insufficient.

  In addition, since there are many types of detergents and the amounts used for ingredients and 1 liter of water are different, depending on the type of detergent, it is difficult to predict the detergent concentration only by the conductivity of the washing water and to suppress foam generation reliably. .

  In addition, the amount of foam generated depends on the components and amount of dirt contained in the laundry, such as when the amount of dirt contained in the laundry is large, the generation of foam is small, and when there is little dirt, the generation of foam increases. In contrast, it was difficult to predict the generation of bubbles only by the conductivity.

  In view of the above problems, the present invention provides a drum-type washing and drying machine that predicts foaming according to detergent concentration and suppresses foaming and suppresses foam from entering a drying air passage through which drying air flows. The purpose is to provide.

  The present invention includes a drying air flow passage through which drying air flowing in a rotating drum circulates, a drain port provided at the rear bottom of the outer tub, a drain valve provided at the drain port, and a drain valve. A drainage passage communicating with the drainage port is provided, and a drying air flow passage is provided at an upper part on the front side of the outer tub, and a discharge port for discharging the drying air to the rotating drum, and drying air discharged from the rotating drum The inlet air flow passage has an inflow port, and the drying air flow passage has a dehumidifying device, a blower fan, a drying filter, and a heater disposed therein, and is provided in the vicinity of the drain outlet, and conducts washing water. A first conductivity sensor for detecting the temperature and a second conductivity sensor which is provided in the drying air flow passage at a position higher than the inlet and detects bubbles entering the drying air flow passage. It is characterized by.

  According to the present invention, it is possible to predict foaming according to detergent concentration and measure foaming suppression. Further, since foaming entering the drying air flow passage can also be detected, it is possible to prevent intrusion to the depth of the drying air flow passage.

  Hereinafter, examples according to embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a drum type washing and drying machine according to an embodiment of the present invention.

  On the upper part of the base 1, an outer frame housing 2 composed of a steel plate and a resin molded product is placed.

  A door 3 for taking in and out the laundry is provided in front of the outer frame housing 2, and an opening / closing operation is performed by a push button switch 4. The door 3 is composed of a resin molded product 39 whose outside is a design part and a heat resistant glass door 40 on the inside.

  A drain hose fixing hole 5 is provided in a side surface portion of the outer frame housing 2. The outer casing 2 is provided with a plurality of handles 6 for carrying and moving the drum type washing and drying machine main body.

  In addition, a detergent tray 7 and a drying filter 8 are attached to the upper surface of the outer frame housing 2 so as to be distributed to the operation unit 9 and the display unit 10 on the left and right sides.

  Further, a drain hose 11 is drawn out from the side surface of the base 1, and legs 12 into which rubber is inserted are arranged at the four corners at the bottom.

  FIG. 2 relates to an embodiment of the present invention, and shows a longitudinal sectional view of a drum type washing machine.

  An outer tub 20 for storing washing water and rinsing water is provided inside the outer frame housing 2.

  The lower part of the outer tub 20 is supported by a plurality of suspensions 21, and the upper part is supported by two tension springs 22, 23 arranged at the front and rear.

  The suspension 21 supports the entire weight of the outer tub 20 and has a strong structure. Further, a damping mechanism or the like is provided for absorbing the vertical vibration of the outer tub 20 generated during the dehydration operation and preventing abnormal vibration due to resonance of the outer tub 20 at the start of dehydration.

  Further, the tension springs 22 and 23 supported from the upper part of the outer tub 20 are provided to prevent the outer tub 20 from collapsing in the front-rear direction and to reduce vibrations before and after the dehydration, up and down, and left and right. .

  When it is easy to wash, water necessary for easy washing is supplied. Water necessary for rinsing is supplied through a water supply hose 24, a water supply electromagnetic valve 25, a water injection hose 26, and a detergent charging case 27 connected to a water faucet.

  The tap water is supplied or stopped by opening and closing the water supply electromagnetic valve 25.

  The supplied water is stored as washing water at the bottom of the outer tub 20 and as rinsing water at the time of rinsing. In the detergent charging case 27, a detergent necessary for washing is charged, and a softening finish for improving the finish is charged when rinsing.

  At the time of washing, the water supplied from the water injection hose 26 is introduced from the upper part of the outer tub 20 through the flexible hose 28 while dissolving the detergent in the detergent introduction case 27.

  The water supply electromagnetic valve 25a forms a double solenoid valve having the same water supply opening as that of the water supply electromagnetic valve 25. The water supply electromagnetic valve 25 a is provided with a water supply port 15 extending in the axial direction at the upper part of the outer tub 20 for supplying water for eliminating foam, and a plurality of water supply holes 15 a are attached to the lower part of the water supply port 15.

  Since bubbles are generated between the outer tub 20 and the rotary drum 29, a long water supply port 15 is provided in the axial direction in order to efficiently remove the bubbles.

  The rotating drum 29 inside the outer tub 20 has the laundry 30 that is put in by opening the door 3. A fluid balancer 31 for reducing unbalanced vibration caused by the laundry 30 during dehydration is provided on the outer periphery of the opening of the rotary drum 29.

  Around the rotating drum 29, a plurality of dewatering holes 32 for dewatering moisture contained in the laundry 30 at high speed during dehydration are provided on the entire circumference.

  A plurality of lifters 33 are provided inside the rotary drum 29 so that the laundry 30 can be lifted up during washing. The rotating drum 29 is directly connected to a drum driving motor 36 via a main shaft 35 connected to a rotating drum metal flange 34.

  The drum drive motor 36 is attached to a metal flange 37 fixed to the outer tub 20.

  In this embodiment, the drum driving motor 36 is a magnet-embedded inner rotor, and the stator uses a DC brushless motor having concentrated windings.

  A rubber bellows 38 made of an elastic body is attached to the opening of the outer tub 20. The bellows 38 is provided so as to be in contact with the seal portion outer peripheral surface 82 of the glass door 40 among the resin molded product 39 and the heat-resistant glass door 40 constituting the door 3, and the watertightness between the inside of the outer tub 20 and the door 3. Has a role to maintain.

  This prevents water leakage during washing, rinsing and dehydration.

  Since the heat-resistant glass door 40 is sandwiched and fixed by a resin molded product 39, a collar portion 80 is provided on the entire circumference, and the inner end face 83 is disposed so as to wrap around the fluid balancer 31 in the axial direction.

  Further, the outer end face 86 is disposed outside the entrance end face 47 of the outer tub 20.

  In the case of the present embodiment, the outer end face 86 is planar. In addition, the inclination of the outer recessed portion 84 is gentle as compared with the inclination of the outer peripheral surface 82 of the seal portion, but the volume of the recessed portion can be further increased by making it the same level.

  Water that has become unnecessary after being rinsed easily or water that has been dehydrated from the laundry 30 during dehydration is drained from the drainage hose 11 by opening the drain valve 41.

  In drying, the drying air blown by the blower fan section 42 passes through the inner side and outer periphery of the rotary drum 29 containing the laundry 30. For this reason, since lint is contained in the drying air, it is necessary to pass the drying filter 8 without fail.

  For this reason, it blows to the heater part 43 through the drying filter 8, and the heated drying air is blown into the rotary drum 29 from the opening 44 provided in the upper part of the outer tub.

  The hot air for drying passes through the laundry 30, passes through the ventilation port 46 of the dehumidifier 45 provided at the bottom of the outer tub 20 from the rear part of the rotary drum 29, and is dehumidified by the dehumidifier 45 and circulated by the blower fan unit 42. Is repeated to dry the laundry 30.

  When the laundry 30 is full in the rotary drum 29, warm air for drying air passes between the rotary drum 29 and the outer tub 20, so that the outer periphery of the rotary drum 29 is easily dried.

  The drying air flowing through the rotating drum 29 is circulated through the drying air flow passage and flows into the rotating drum 29 again. The drying air flow passage includes a dehumidifying device 45, a blower fan 42, a drying filter 8, and a heater 43.

  The drying air flow passage has an outlet portion 44 and an inlet portion 46 into which the drying air discharged from the rotary drum 29 flows. The drying air that has flowed through the drying air flow passage is discharged from the delivery port 44 toward the front upper portion of the rotary drum 29.

  Then, the drying air that flows through the rotary drum 29 and is discharged from the rear portion of the rotary drum 29 flows into the drying air flow passage from the inflow port portion 46 that faces the position near the rear lower portion of the rotary drum 29.

  The drainage port 300 is provided at the bottom on the rear side of the outer tub 20 inclined so that the rear side is on the lower side. The drain valve 41 is provided at the drain port 300. The drainage port 300 communicates with the drainage hose 11 of the drainage channel via the drainage valve 41.

  The first conductivity sensor 48 is disposed in the vicinity of the drain valve 41 inside the outer tub 20. The reason why the first conductivity sensor 48 is provided at this position is that this portion is at the lowest position, the washing water remains until the end, and the water level is stable.

  The first conductivity sensor 48 can detect washing water, rinsing water, and dewatering in the outer tub 20 up to a slight residual water.

  The second conductivity sensor 49 is disposed on an upper portion of the dehumidifying device 45 provided in the drying air flow passage.

  The position where the second conductivity sensor 49 is provided is higher than the inlet 46 of the drying air flow passage. Further, it is also an intermediate position between the main shaft 35 of the washing drum tank 29 and the upper surface (upper part) of the outer tank 20.

  The second conductivity sensor 49 functions to detect generated bubbles. If it is provided in the vicinity of the inlet 46 of the air flow passage for drying, the second conductivity sensor 49 detects the bubbles as soon as the bubbles generated due to dehydration enter the inlet 46, which may cause a malfunction.

  Conversely, when the second conductivity sensor 49 is provided at the upper surface (upper) position of the outer tub 20, there is a problem that the bubble detection is delayed.

  That is, when the second conductivity sensor 49 is provided at the rear upper surface (upper) position of the outer tub 20, detection is performed in a state where an abnormally large amount of bubbles are generated. Even if the amount of generation increases and is detected, it will not be in time.

  In particular, during the dehydration, the rotating drum 29 is rotated so that there is a large inertia until the rotation is stopped. For this reason, if there is no allowance for foam detection, the generated foam enters into the blower fan 42, and the insulation of the electrical components is lowered.

  As a position satisfying these conditions, it is possible to detect bubbles with a margin and perform bubble extinguishing by disposing them at a substantially intermediate position between the rear upper surface portion of the outer tub 20 and the main shaft 35.

  A water supply pipe 16 for performing water-cooled dehumidification is provided on the inner upper surface of the dehumidifier 45, and is usually supplied as cooling water during drying.

  As this cooling water, the remaining hot water of the bath and tap water are used.

  FIG. 3 relates to the embodiment of the present invention, and is a block diagram showing an operation process of the drum type washing machine.

  This operation process removes dirt adhering to the laundry 30 and rinses away the detergent due to rinsing. In addition, a general automatic washing course that automatically performs a series of processes such as dehydrating moisture contained in the laundry 30 by centrifugal force generated by the high-speed rotation of the rotary drum 29 and draining the moisture. It is shown in the block diagram.

  Each step will be described below based on the block diagram.

  Water supply 50 is performed by operating the water supply electromagnetic valve 25. In the washing step 51, when water necessary for washing is supplied into the outer tub 20, the drum driving motor 36 rotates and the rotating drum 29 is rotated.

  The rotation speed of the rotating drum 29 at this time is 40 to 50 rotations per minute, and the laundry 30 is lifted up by the lifter 33 in the rotating drum 29 by performing a right rotation and a left rotation every few minutes with a pause. While washing by tapping.

  When the washing process 51 is completed, the dirt attached to the laundry 30 is removed by washing, and the process proceeds to a draining process 52 for discharging dirty washing water to the outside of the washing machine.

  After the drainage is completed, the process proceeds to a dehydration step 53 for dehydrating the detergent contained in the laundry 30. In the dewatering step 53, the rotating drum 29 is rotated at a high speed, and the laundry 30 is dewatered from the plurality of dewatering holes 32 provided on the inner wall of the rotating drum 29 by centrifugal force.

  The number of rotations at this time is 800 to 1500 rotations per minute. When the dehydration process 53 is completed, the detergent contained in the laundry 30 is rinsed and the process proceeds to the rinsing process 54.

  Before entering the rinsing step 54, fresh water necessary for supplying fresh water is supplied into the outer tub 20 in the water supply step 50 for supplying fresh water in the same manner as the washing step 51. In this embodiment, 25 to 30 liters of fresh water necessary for rinsing is supplied as in the case of washing.

  When a specified amount of fresh water is supplied, the process automatically proceeds to the rinsing process 54, and the detergent contained in the laundry 30 while the rotating drum 29 rotates at a low speed (around 45 rotations per minute) as in the washing process. Remove minutes.

  In this embodiment, the rinsing is performed twice, but the number of times of the rinsing step 54 is two to three. After the rinsing step 54 is completed, drainage is performed and the final dehydration step 55 is entered to sufficiently dehydrate the moisture contained in the laundry 30.

  The dewatering time of the final dewatering step 55 is generally 5 minutes or longer, and the rotating drum 29 is rotated at a high speed to remove the moisture of the laundry 30 by centrifugal force. The dehydration rate at this time is 60 to 65%.

  In the drum type washing and drying machine, warm air is circulated in the tank by the heater 43 as a heat source, and the process automatically proceeds from washing to drying.

  In this case, after the final dehydration process 55 is completed, the process automatically proceeds to the drying process 56. In the drying step 56, after the moisture of the laundry 30 is sufficiently removed, the rotary drum 29 is reversed or rotated in one direction at 40 to 55 revolutions per minute while blowing warm air to the laundry 30 by the heater unit 43. The moisture of the laundry 30 is removed and dried.

  In order to shorten the drying time, it is necessary to increase the number of revolutions in the final dehydration step 55 to increase the dehydration rate, and the maximum is 1500 revolutions per minute. Thereby, although it depends on the diameter of the rotating drum 29, the dehydration rate is about 70%.

  FIG. 4 relates to an embodiment of the present invention, and shows a circuit for driving a drum type washing machine.

  The commercial power supply 60 of AC100V enters the filter circuit 64 through the outlet 63 through the fuse 63 arranged in parallel with the power switch 62. From the back of the filter circuit 64, power is directly supplied to various electrical components and the rectifier circuit 65.

  A switching power supply 66 and an inverter circuit 67 for supplying a low-voltage DC power supply are connected from the rectifier circuit 65. In addition, a voltage detection circuit 68 and a fuse 69 are connected between them. The inverter drive circuit 70 controls the inverter drive circuit 67 by the signal of the rotational position sensor 71 attached to the drum drive motor 36 to rotate the drum drive motor 36.

  The entire drum type washing machine is controlled by the microcomputer 72. The electric parts directly driven by the commercial power source 60 include the water supply electromagnetic valve 25 and the drain valve 41, which are performed by controlling the current flowing through the relay winding 74 by the microcomputer 72 through the relay contacts 73 connected in series with each other. .

  Further, the blower fan 42 used in the drying process and the circulation pump motor 76 used at the time of washing and rinsing use the same inverter circuit 77 with the changeover switch 78 being used. For this reason, a circuit can be shared and cost can be reduced. The heater 43 is connected in parallel with heaters of the same capacity, and the power source is taken from the front of the filter circuit 64.

  This is because the heater 43 is a pure resistor, so that it is not necessary to pass through the filter circuit 64, and the heater 43 has a large current, so that it is used before the filter circuit 64 to reduce the inductance capacity.

  The first conductivity sensor 48 and the second conductivity sensor 49 shown in FIG. 4 are formed by pairs of two metal plate electrodes having good corrosion resistance. In this embodiment, the electrodes are constructed by keeping the stainless steel plates parallel with a spatial distance of about 5 mm.

  The first conductivity sensor 48 and the second conductivity sensor 49 are connected to the insulating transformer 80 via the changeover switch 79. Switching is performed via the microcomputer 72. The foam detection circuit 81 connected in series with the insulating transformer converts the resistance between the metal plates into a frequency, takes it into the microcomputer 72 and compares it with a preset threshold value to determine the presence of foam and the detergent concentration. is doing.

  FIG. 5 relates to an embodiment of the present invention, and shows an operation flow of the first conductivity sensor in washing.

  When washing, the conductivity of the washing water is detected by the first conductivity sensor 48, and if the detection value of the threshold detection 100 is between A1 and B1, it is determined that the amount of detergent is appropriate for washing. The washing process is performed.

  If the detection value of threshold detection 100 is greater than B1, it indicates that the detergent concentration is high. Indicates that washing is performed using more than the specified amount of detergent.

On the contrary, when the detection value of the threshold value detection 100 is smaller than the value of A1, it indicates that the detergent concentration is low. When the detergent concentration is low, an abnormal foaming phenomenon at the time of washing does not occur and the process proceeds according to a normal operation course. However, in the threshold detection 100, if the detection value becomes B1 or more, the water supply process 101 further increases. After forcibly supplying water into the outer tub 20, the conductivity value of the washing water in the outer tub 20 is confirmed again by the first conductivity sensor 48, and the detected value of the threshold detection 107 is still B1 or more. If so, the amount of detergent is more than the specified amount. For this reason, the wash water previously supplied is forcibly drained 102 and the fresh water is supplied 103, and an appropriate amount of detergent is reintroduced. Wash 104 and proceed to the next step.

  In the threshold detection 100, when the detected value is equal to or less than A1 or between A1 and B1, the washing operation 101 is performed, and the second electric conductivity sensor 49 detects the state of foaming at the time of washing.

  When the detected value is B2 or more in the threshold detection 105, the process proceeds to the process of the drainage 102 forcibly even during the washing 104, the water supply 103 is performed, and the washing operation 104 is performed again with fresh water. When the step of the washing operation 104 is completed, the process proceeds to the next step 106.

  FIG. 6 relates to an embodiment of the present invention, and shows an operation flow of the conductivity sensor in dehydration after washing and rinsing.

  At this time, since the drainage operation is performed and then the process proceeds to dehydration, the process proceeds to the bubble erasing process based on information from the second conductivity sensor 49.

  When the detection value of the threshold value detection 109 is large, the dehydration operation stop 110 is performed, the drain valve is closed 104, the water supply electromagnetic valve ON111 for operating the water supply electromagnetic valve 25a is performed, and water is supplied from the water supply port 15 to The bubbles accumulated between the tank 20 and the rotating drum 29 are efficiently removed.

  Further, the bubbles in the dehumidifying device 45 are floated on the surface of the water only by the washing water supplied, so that the bubbles cannot be removed easily, and the bubbles rise as the water level rises.

  For this reason, water is supplied from the water supply pipe 16 positioned above the second conductivity sensor 49 to remove bubbles in the dehumidifying device 45 and bubbles attached to the electrodes of the second conductivity sensor. As a result, the second conductivity sensor 49 can be restarted.

  Thereafter, when the defoaming water level 112 is reached, the rotating drum 29 is dehydrated 114 by the low speed operation 113 having a lower rotational speed than washing and rinsing.

  When the detection value of the threshold value detection 109 of the second conductivity sensor 49 is small, the continuous operation 115 that continues the dehydration operation until the end is performed.

  FIG. 7 relates to an embodiment of the present invention, and shows an operation flow of the conductivity sensor in rinsing.

  The main purpose of the conductivity sensor in rinsing is to reduce the concentration of detergent contained in the laundry.

  For this reason, the first conductivity sensor 48 is used as the conductivity sensor. When the detection value of the threshold detection 116 is large, the drain valve 41 is opened and drainage 117 is performed, dewatering 118 is performed after drainage, water supply 119 is performed, water is supplied to the rinse water level 120, and the rinse operation 121 is performed.

  According to the present embodiment, since the first conductivity sensor 48 is mounted in the outer tub 20 at the position where the washing water level is the lowest, the water level is low in a drum type washing / drying machine having a low water level and a small amount of rinsing water. Even if fluctuates, the conductivity can be stably operated.

  Further, since the first conductivity sensor 48 is located on the outer peripheral side of the rotating drum 29, the electrode of the conductivity sensor is well washed by a strong flow of washing water that is generated during washing or dehydration.

  The second conductivity sensor 49 for detecting bubbles is disposed on the upper side in the air blowing path of the dehumidifying device 45. Since this position is generally an intermediate position between the main shaft and the rear upper surface of the outer tub 20, the dehydration operation is detected by the second conductivity sensor 49 even if bubbles generated during dehydration enter the air flow passage for drying. Is stopped.

  For this reason, bubbles do not enter the back side of the air flow passage for drying where the blower fan 42 and the electrical parts are placed, and the insulation of the electrical parts is prevented from being lowered.

  The first electrical conductivity sensor 48 detects the detergent concentration and eliminates bubbles. The detection of detergent concentration alone cannot cope with the relationship between foam and conductivity, which varies greatly depending on the type of detergent. However, when the second conductivity sensor 49 and the first conductivity sensor 48 are used in combination, the insulation deterioration of the electrical components can be prevented against bubbles generated beyond the detergent concentration adjustment by the first conductivity sensor 48. Is planned.

  Since the first and second conductivity sensors having a pair of metal plate electrodes and one bubble detection circuit are switched by the changeover switch 79, the detection is made in time, and the configuration is simple and inexpensive. become.

1 is a perspective view of a drum type washing and drying machine according to an embodiment of the present invention. The longitudinal cross-sectional view of the drum type washing-drying machine which concerns on the Example of this invention is shown. It is a block diagram which concerns on the Example of this invention and shows the driving | operation process of a drum type washing machine. The circuit which drives a drum-type washing machine according to the embodiment of the present invention is shown. The operation flow of the conductivity sensor in washing according to the embodiment of the present invention is shown. The operation flow of the conductivity sensor according to the embodiment of the present invention in dehydration after washing and rinsing drainage is shown. It concerns on the Example of this invention, The operation | movement flow of the conductivity sensor in a rinse is shown.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 8 ... Drying filter, 20 ... Outer tub, 29 ... Rotary drum, 30 ... Laundry, 42 ... Blower fan, 43 ... Heater, 45 ... Dehumidifier, 48 ... First conductivity sensor, 49 ... Second conductivity Degree sensor, 51 ... washing step, 53 ... dehydration step, 54 ... rinsing step, 56 ... drying step, 79 ... switch, 81 ... foam detection circuit.

Claims (4)

A rotating drum in which a rotating shaft center line rotating or rotating in a washing process, a rinsing process, a dehydrating process and a drying process is stored horizontally, and an outer tub in which the rotating drum is placed to store washing water ,
The drying air flow passage through which the drying air flowing in the rotating drum circulates, the drain port provided in the rear bottom of the outer tub, the drain valve provided in the drain port, and the drain valve A drainage channel communicating with the drainage port;
The drying air flow passage is provided in an upper part on the front side of the outer tub, is located near the lower part on the rear side of the rotating drum, and is provided in the vicinity of the lower part on the rear side of the rotating drum. Having an inflow port through which the dried drying air flows,
Further, the drying air flow path includes a dehumidifying device, a blower fan, a drying filter, and a heater arranged here,
A drum-type laundry drying system comprising: a first conductivity sensor provided in the vicinity of the drain outlet; and a second conductivity sensor provided in the drying air flow passage at a position higher than the inlet portion. Machine. The drum type washing and drying machine according to claim 1,
The first conductivity sensor has a detection function of detecting the detergent concentration of the washing water in the washing process and the rinsing process, and the second conductivity sensor performs the drying in the washing process, the rinsing process, and the dehydrating process. A drum-type washer-dryer having a detection function of detecting a gun entering the air flow passage for a vehicle. In the drum type washing and drying machine according to claim 1 or 2,
A drum-type washing and drying machine comprising: a foam detection circuit; and a changeover switch for selectively switching and connecting the first conductivity sensor and the second conductivity sensor. In the drum type washing and drying machine according to any one of claims 1 to 3,
The drum-type washing and drying machine, wherein the second conductivity sensor is provided at a substantially intermediate position between the main shaft supporting the rotating drum and the rear upper part of the outer tub.

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