JP2013128637A - Drum type dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent drying from being ended in a half-dried state even when different kinds of clothes are mixed.SOLUTION: A drum type dryer includes: a rotary tub 2 which has an opening on the front side and accommodates clothes, and which has conductivity; a motor 11 which drives the rotary tub 2; a washing tub 3 which rotatably includes the rotary tub 2 therein; a heat pump device 5 (heating section) which heats air; an air blowing section 7 which blows the air heated by the heat pump device 5 into the washing tub 3; a back cover plate 9 (annular electrode) provided on the front side of the washing tub 3; and a detector 104 which detects the dryness of the clothes. The detector 104 is connected to the rotary tub 2 and the back cover plate 9. Thereby, regardless of a cloth amount and cloth quality, the contact area between the electrode and the clothes can be increased, so that the electrode can easily detect a half-dried state of the clothes.

Description

  The present invention relates to a drum dryer that detects the degree of drying of clothes during drying and automatically determines the end of drying.

  Conventionally, this type of clothes dryer is provided with a rotating drum rotatably in the body, and hot air heated through a heater by rotation of the blower fan is introduced into the rotating drum from the blowout port, so that clothes such as clothes can be covered. The dried product is dried. In addition, a pair of electrodes is provided on the inner peripheral plate provided on the front side of the main body so that clothes to be agitated in the rotating drum come into contact with each other. It is considered to detect (see, for example, Patent Document 1).

  However, if the drying degree exceeds the reference value, the end of drying is determined, but the frequency of contact between the clothes itself is reduced, so that the degree of drying cannot be detected, and the end of drying is determined. Actually, the clothes may be dry.

  Therefore, after determining the end of drying, when the drying process is continued for a certain period of time, or when the drying process is completed, the resistance value between the electrodes is continuously detected during the certain period of time, and the resistance value between the electrodes within that period. However, when it is detected that it is not dried again, the clothes are prevented from being dried by a method of extending the drying time for a certain time (see, for example, Patent Document 2).

  FIG. 6 is a flowchart showing the operation of the clothes dryer described in Patent Document 2. As shown in FIG. 6, first, when the drying operation is started, the resistance value between the electrodes instantaneously decreases every time wet clothing comes into contact with the detection electrode, and the instantaneous value increases as the drying progresses. . This decrease in resistance value is generated as a peak voltage, the time during which the peak voltage exceeds the reference value for a certain time after the start of drying is counted, and the capacity of the load is calculated by the microcomputer from the ratio to the certain time ( Step S11). Next, the drying detection process is started. First, the timer count of the microcomputer is reset (steps S12 and S13).

  The maximum value Vamax is sequentially updated and recorded until the reset signal is generated after time T1. When the maximum value Vamax is higher than the set value, it is considered that the load is not yet dried, and Vamax at that time and the time T2 until the next reset are determined from the capacity of the load obtained previously, and the peak hold circuit is It is reset (steps S14, S15, S16).

  The time until the reset is set so as to decrease as the maximum value of the instantaneous voltage that is peak-held decreases as the drying of the load progresses, and the interval T2 and T3 of the reset signal decreases as Vamax decreases. . When the peak hold voltage falls below the set value, the number of periods during which the peak hold voltage falls below the reference value is counted. (Steps S17 to S21).

  Even after the dryness detection is finished, the resistance value of the clothes is continuously detected by the detection electrode together with the start of the timer count. And when the instantaneous voltage of the clothes becomes larger than the value that the dry detection end is determined earlier, it is determined that the dry detection has failed (the clothes that have not been dried yet) The timer count is cleared and the timer count is restarted immediately after the end of drying detection to extend the heater energization time (steps S22 to S25).

  This operation is repeated until the timer count ends, and after the timer count ends, the air blowing operation for cooling is performed for a predetermined time, the heater is turned off, and the operation is ended (steps S26 to S28).

  Therefore, after finishing dryness detection, when finishing operation is performed and the situation where the drying is not completed within a certain period of time is detected, the heater energization is extended, and the presence or absence of the extension of drying is judged in the same way after the extended time has elapsed. And dryness detection.

Japanese Patent Application Laid-Open No. 5-25397 JP-A-5-84398

  However, in the above-mentioned conventional configuration, it is assumed that the clothing is in contact with the electrode, and in the case of mixed clothing, the fast-drying clothing is biased to the electrode mounting portion, and the undried clothing does not contact the electrode Is not assumed. In particular, when warm air for drying is blown forward from the rear part of the rotating tank and the electrode is in the front part of the rotating tank, as the drying progresses, the fast-drying garment moves toward the front part of the rotating tank. It is easy to concentrate in the vicinity of the electrode, and the undried clothing cannot contact the electrode. Therefore, in that case, the probability that the electrode detects undried within a certain period of time after the completion of drying detection is extremely low, and it cannot be said that the accuracy of drying detection is sufficient.

  In addition, because the probability of clothing coming into contact with the electrode within a certain period of time is affected, clothing with a large capacity will hardly move in the rotating tank, so if different types of clothing such as synthetic clothing and cotton clothing are mixed It is possible to accurately detect dryness by touching the electrodes evenly, but if the electrode part is small, the probability decreases, so if the dry garment that is easy to dry covers the electrode However, there is a problem that the cotton garment does not come into contact with the electrode, and the drying ends even though only the cotton garment is freshly dried.

  In addition, when the amount of clothing is small, when the warm air from the heater blows out from the front of the rotating tub, the clothing is biased toward the rear of the rotating tub and the clothing does not contact the front of the rotating tub with electrodes. For this reason, there is a problem that the end of drying is detected early, and the clothes at the rear of the rotating tub are in a dry state.

  In addition, if the amount of clothing is small and the warm air from the heater is blowing from the rear of the rotating tub, the clothing tends to move to the front of the rotating tub with electrodes, so the frequency with which the clothing contacts the electrodes is Although it becomes higher and the detection accuracy is improved, there is a problem that the cotton clothes that are dry-drying do not come into contact with the electrodes because the synthetic clothes are dried and lightened so that the dried synthetic clothes are covered with the electrodes.

  Further, in that case, in order to extend the drying time, it is necessary that the garment contacts the electrode even once. However, since this is not possible, the drying time cannot be extended. Also, even if contact is detected once, the frequency is extremely low, so it is a mechanism that repeats the extension time, but since it can not be detected by the electrode, how much extension is possible and how much extension is originally necessary? Assuming that, the time extension is not decided, the accuracy of both the degree of drying and the extension time is low.

In addition, when it is difficult to make a judgment based on a change in resistance value due to the electrodes, a method of judging the degree of drying from the air blowing temperature to the rotating tub and the return temperature from the rotating tub is also used in the conventional drum-type washing dryer. In that case, it is necessary to measure the hot air temperature for a certain period of time in order to make a determination based on the stability of temperature and the degree of change in temperature. However, in the case of the heater method or heat pump method, if energization is continued, the hot air temperature can be measured and determined for a certain period of time. Temperature measurement may be difficult and it may not be possible to determine the end of drying.

  Especially in the heater type, it is necessary to turn off the energization when the temperature rises too much, and in the heat pump type, the energization is turned off when the rotation speed of the compressor motor can be variably adjusted as in the inverter type. Since there is no need, the temperature can be measured for a certain period of time. However, if the compressor motor is at a constant speed (induction motor), the rotation speed cannot be varied, so adjustment is made by turning the power on and off. There is a problem that it is difficult to determine the end of drying because the temperature of the time cannot be measured.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a drum dryer that can finish drying without generating freshly-dried clothes even when various kinds of clothes are mixed. And

  In order to solve the above-mentioned conventional problems, the drum dryer of the present invention has an electrically conductive rotating tub that has an opening on the front side and accommodates clothes, a motor that drives the rotating tub, Provided on the front side of the washing tub, a washing tub enclosing the rotating tub rotatably, a heating unit for heating air, a blowing unit for blowing air heated by the heating unit into the washing tub An annular electrode and a detection unit for detecting the degree of dryness of clothing are provided, and the detection unit is connected to the rotating tub and the annular electrode.

  As a result, the contact area between the electrode and the garment can be increased regardless of the amount or quality of the cloth, so that the electrode can easily detect the dryness of the garment.

  The drum dryer according to the present invention can perform an appropriate drying operation by improving the performance of drying detection regardless of the capacity of various kinds of mixed clothes in the drum.

Sectional drawing of the principal part of the drum type washing-drying machine in Embodiment 1 of this invention The perspective view which shows the principal part structure of the drum type washing-drying machine Control block diagram of the drum type washer / dryer Graph showing drying time and drying rate for each clothing type (in the case of one capacity) of the drum type washing and drying machine Graph showing change in clothes condition detection frequency and drying time by electrodes of the drum type washing and drying machine A flowchart showing the operation of a conventional drum-type washing and drying machine

  A drum dryer according to a first aspect of the present invention includes an electrically conductive rotating tub that has an opening on the front side and accommodates clothes, a motor that drives the rotating tub, and a rotating tub that is rotatable. The washing tub, the heating unit for heating the air, the air blowing unit for blowing the air heated by the heating unit into the washing tub, the annular electrode provided on the front side of the washing tub, and the degree of drying of the clothes The detection part is connected to the rotating tank and the annular electrode.

As a result, the contact area between the clothing and the electrode can be increased, so that when the clothing has a small capacity and the types of clothing are mixed, it is possible to prevent the fast-drying clothing from covering the electrode of the determination unit. In addition, even when there are more clothes than the rated capacity and the clothes in the rotating tank are difficult to move, the rotating tank functions as an electrode, so there is a high probability that the undried portion of the clothes and the electrode are in contact with each other. Completing the drying while drying can be reduced.

  The second invention includes a determination unit that determines the degree of drying of clothing from the conductive characteristics between the rotating tub and the electrode, a recording unit that previously holds a drying time for each capacity according to the type of clothing, A clothing amount determination unit for detecting a clothing amount; and a control unit for controlling the airframe, wherein the determination unit is configured to dry the recording unit according to clothing when the clothing amount determination unit determines that the amount is less than a predetermined capacity. By determining the correction time of the drying process after the dry detection determination of the determination unit from the time, in the drum dryer that is blown from the rear side of the rotating tank, the clothes are small in volume and the types of clothes are mixed In this case, even if it is determined that the clothes that are dry quickly are covered with the electrode of the determination unit and other types of clothes are in a dry state, Drying time by type and volume By recording, if the amount of clothing in the clothing amount determination unit is less than a certain amount of clothing, it is determined that the clothing that has quickly dried the mixed clothing has detected dryness in the determination unit, and the drying of the fast-drying clothing is determined. By determining the correction time after the dry detection judgment of the judgment part from the difference between the time and the slow clothing drying time, it is possible to prevent slow-drying clothing from becoming dry, the amount of clothing is rated capacity, etc. In the case of a certain capacity or more where clothes do not move so much in the rotating tub, it is possible to perform optimum drying according to the capacity by determining the drying end time based on the drying detection determination of the determination unit.

  According to a third aspect of the invention, in particular, in the second aspect of the invention, the determination unit sets the correction time as the time obtained by adding the difference time for each clothing type to the normal extension time of the slow-drying clothing. By adding the difference time from the slower drying time to the normal correction time from the detection of dryness, drying of mixed clothes can be prevented, and the optimal correction time from the drying time held in the recording unit Can be easily determined.

  According to a fourth aspect of the invention, in particular, in the second aspect of the invention, the determination unit sets the correction time as the difference time between the slow-drying clothing and the fast-drying clothing, so that the dry clothing with the fast-drying time is equal to or greater than the specified value. The rate of drying of clothing that is slow to dry is ensured by ensuring the target drying rate, thereby shortening the drying time and ensuring that the drying rate for each type of clothing exceeds a certain value. The rate can always be above the specified value.

  In a fifth aspect of the invention, in particular, in the second aspect of the invention, the determination unit calculates a correction time by adding a difference time for each clothing type to a normal extension time for slowly drying clothing and an extension time for each clothing type. By comparing the total time with the shorter time, the drying rate of the mixed clothing can ensure a drying rate equal to or higher than a specified value and shorten the drying time.

  According to a sixth aspect of the invention, in particular, in the second aspect of the invention, the heat pump device uses an induction motor as a motor for driving the compressor, thereby eliminating the need for an inverter circuit and the like, and a stable constant speed rotation with a simple circuit configuration. The compressor can be operated at the same time, and the circuit configuration is simple and economical.

  In the seventh aspect of the invention, in particular, in the second aspect of the invention, the recording unit holds the drying time for each capacity of the cotton garment and the synthetic garment so that the garment having a fast drying degree and the slow garment 2 The correction time of the drying process can be easily determined only by the type, and the drying time of most clothing can be covered.

In an eighth aspect of the invention, in particular, in the first aspect of the invention, the electrode is arranged in parallel with one electrode grounded via a bearing of the rotating shaft of the rotating tub and a predetermined distance in front of the rotating tub. By forming the other plate-like electrode and applying a DC voltage between the electrodes, the frequency of contact between the electrodes can be increased when clothing is being stirred in the rotating tub. Further, it is possible to improve the dryness detection accuracy of the determination unit by eliminating the influence of the induction of the commercial power supply frequency from the ground electrode side.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments. In the present invention, since the presence or absence of the washing function is irrelevant, the drum type dryer includes a drum type laundry dryer having a washing function.

(Embodiment 1)
FIG. 1 is a cross-sectional view showing a main part of a drum-type washing / drying machine according to the first embodiment of the present invention. FIG. 2 is a main part of the drum-type washing / drying machine according to the first embodiment of the present invention. FIG. 3 is a control block diagram of the drum type washer / dryer, and FIG. 4 is a drying process of each of the small-capacity synthetic garments and cotton garments that are equal to or less than a certain capacity of the drum type washer / dryer. FIG. 5 is a graph showing changes in elapsed time and drying rate, and FIG. 5 shows changes in elapsed time and detection frequency of the detection unit in the drying process of small-capacity synthetic garments and cotton garments that are equal to or less than a certain capacity of the drum type washing and drying machine. It is a graph which shows.

  1 to 5, a drum-type washing and drying machine main body 1 stores clothes i, has a conductive metal rotating tub 2, and stores the rotating tub 2 inside, and has conductivity. For example, it has a washing tub 3 made of synthetic resin. It has a heat pump device 5 (heating unit) connected to the washing tub 3 at the front side 4 of the pipe, and a blower unit 7 connected to the washing tub 3 via the rear side 6 connected to the heat pump device 5. ing. The rotating tank 2 is driven and rotated by the motor 11 as instructed by the control unit 10.

  The pipe front 4 is an air passage that sends air from the washing tub 3 to the heat pump device 5, and the pipe rear 6 is an air passage that sends air from the heat pump device 5 to the washing tub 3. The blower unit 7 is configured by a fan unit including a blower fan and a fan motor that drives the blower fan.

  As the blower 7 is driven, the air from the washing tub 3 is dehumidified and heated by the heat pump device 5 and is again introduced into the washing tub 3 from the outlet 29 provided at the upper bottom of the washing tub 3. Is done. The clothes a in the rotating tub 2 are lifted in the rotating tub 2, receive wind from the outlet 29 through the through-hole provided in the bottom surface of the rotating tub 2, and the front direction which is the opening of the rotating tub 2. Pressed. A rotating tub 2 that has conductivity and constitutes one electrode (electrode B), a lid back plate 9 that is formed in a plate shape and is provided on the front side of the washing tub 3 and constitutes the other electrode (electrode A); It is set as the structure which detects the conductive property of wet clothing by contacting between.

  That is, the electrode comprises one electrode (electrode B) in the metal rotating tank 2 having conductivity, and is arranged in parallel with a certain distance d in front of the rotating tank 2. The other electrode (electrode A) formed of, for example, an annular metal plate, facing the clothing input opening provided in FIG. The user can put clothes into the rotating tub 2 through the opening of the lid back plate 9 and the opening of the rotating tub 2. Although the resistance of clothing is detected by the rotating tub 2 and the lid back plate 9, the rotating tub 2 rotates, so it is difficult to provide the rotating tub 2 with wiring for viewing conductivity. Therefore, the conductivity with the lid back plate 9 is measured by the fixing bracket 31 grounded through the bearing 30 of the rotating shaft. Since the rotating tub 2, the bearing 30, and the fixing bracket 31 are all conductive, the conductivity of the rotating tub 2, the clothing in the rotating tub 2, and the lid back plate 9 is measured via the fixing bracket 31. it can.

In the heat pump device 5, the blower 7 blown into the washing tub 3 through the post-pipe 6 passes through the rotary tub 2 and returns via the pre-pipe 4 in a state including humidity. The air is heated and dehumidified, and the air is blown again from the blower unit 7.

  In FIG. 3, the control unit 10 includes a drive unit 101 that drives the induction motor 52 of the compressor 51 of the heat pump device 5 and a clothing amount determination unit 105 that determines the amount of clothing stored in the rotary tub 2. ing. The rotating tub 2 (electrode B) and the lid back plate (electrode A) are connected to a detection unit 104 that detects the degree of dryness of clothes. It has a detecting unit 104 that detects the degree of dryness of clothes from the conductive characteristics between the conductive rotating tank 2 that is one electrode (electrode B) and the lid back plate 9 that is the other electrode (electrode A). Yes. In addition, the correction of the drying process is performed based on the recording unit 102 that previously stores the drying time for each capacity as data for each type of clothing, the determination value of the clothing amount determination unit 105, the detection result of the detection unit 104, and the data of the recording unit 102. And a determination unit 103 for determining time.

  Further, the motor 11 is configured to rotate the rotating tub 2 according to a command from the control unit 10. The heat pump device 5 includes a compressor 51 having a built-in induction motor 52 and a heat exchanger 53. The heat pump device 5 dehumidifies the humid air in the rotating tank 2 and sends the air to the rotating tank 2 through the blower unit 7. It is configured. The heat exchanger 53 includes an evaporator that cools and dehumidifies moist air, and a condenser that heats the air cooled and dehumidified by the evaporator.

  FIG. 4 shows the change over time in the drying rate when small-capacity clothes of a certain volume or less are dried for each garment in the drying process. , The time over which the two garments exceed the drying rate of about 95% from the drying start time T0, the synthetic clothing T1 and the cotton clothing T2, respectively, and the time difference Ts.

  Further, the time from the time when each garment exceeds about 95% to the time when the drying rate exceeds about 98% is shown as the extended time Ta of the synthetic garment and the extended time Tb of the cotton garment, respectively.

  Here, although the drying rate of the drying start time T0 is not shown, it usually shows the state after the dehydration process of the drum type washing and drying machine is performed, and the dehydration rotation speed of the rotating tub 2 in each dehydration process. This is a condition that is assumed to have been performed in the dehydration process of the drum type washing and drying machine, since it is known in advance from the capacity of the rotary tub 2.

  Therefore, these changes in the drying rate are recorded in the recording unit 102 for each volume as data obtained from experimental values in advance.

  The drying rate shown in FIG. 4 is obtained from an experimental value based on the moisture content of clothing, but in FIG. 5, the frequency (number of times) at which the detection unit 104 detects contact of the clothing with the electrode is shown. It is what is shown. Therefore, the contact frequency A1 of the small-capacity synthetic garment and the contact frequency B1 of the cotton garment are shown, the threshold number N set in advance as an experimental value so that the drying rate is about 95%, and the contact number N or less The time when it becomes becomes the chemical clothing T1 and the cotton clothing T2, and shows the difference time Ts.

  Further, the extension time after the threshold N times or less is shown as the extension time Ta of the chemical clothing and the extension time Tb of the cotton clothing.

  The contact frequency shown here is determined to be contacted when clothing a touches between the rotating tub 2 and the lid back plate 9 and the resistance value (or conductivity) at the time of contact is less than a specified value. The number of contact determinations per minute is counted. Therefore, even when the clothing comes into contact, since the clothing is dry, if the resistance value (or conductivity) is equal to or higher than the specified value, the number of times of contact is not counted.

  That is, it is dry or not in contact. Since the specified value of the resistance value (or conductivity) depends on the resistance value of water used during washing, it is known in advance according to the destination (region) to be used, so the degree of drying can be determined by the specified value It is. Therefore, the determination can be made using a predetermined value that has been determined in advance.

  The operation and action of the drum type washing and drying machine configured as described above will be described below. First, the drum-type washing / drying machine has washing, rinsing, dehydrating, and drying processes. In order to detect the amount of clothes stored in the rotating tub 2 before washing, the motor 11 is driven to rotate the rotating tub 2. , The clothing amount determination unit 105 determines the clothing amount.

  Moreover, when performing from a drying process, clothes i are accommodated in the rotation tank 2 after dehydration, and before the drying process, the motor 11 is similarly driven, and the rotation tank 2 is rotated, whereby a clothing amount determination unit 105 determines the amount of clothes from the wet state after dehydration.

  Therefore, the clothes amount determination unit 105 detects the amount of clothes in the rotating tub 2 regardless of whether the washing process is performed or the drying process is performed.

  Thereafter, in the drying process, the control unit 10 drives the motor 11 to rotate the rotating tub 2 at about 45 rpm to 60 rpm in a specific sequence, and the clothes i in the rotating tub 2 fall from the upper part in the rotating tub 2, In this state, the blower blown from the blower unit 7 is blown into the rotary tub 2 through the rear pipe 6 and hits the clothes i, and the dehumidification of the clothes i is started inside.

  Next, the blow air passes through the rotary tank 2, passes through the pipe front 4, and is dehumidified in the heat exchanger 53 by the refrigerant compressed by the compressor 51 in the heat pump device 5 and contains moisture. Is heated and dried, and is again blown into the washing tub 3 from the blower 7 as hot air. By repeating this dehumidifying and drying cycle, the clothes are gradually dried. As a result, as shown in FIG. 4, the drying rate changes with time.

  FIG. 4 shows, for example, a drum-type washing / drying machine having a drying capacity of 3 kg, and changes in drying rate over time when drying is performed with a capacity of 1 kg. It shows how each garment changes when the weight is 1 kg.

  It is known from experimental values that the synthetic garment has a drying rate exceeding 95% from the start time T0 to T1, and reaches a drying rate of 98% after the drying is continued for an extended time Ta. Furthermore, it has been found from experimental values that the drying rate of cotton clothing exceeds 95% from the start time T0 to T2, and reaches 98% after the extended time Tb after continuing the drying. The time difference between the times T1 and T2 when the drying rate exceeds 95% is also known as Ts from the experimental results.

  If these experimental data are recorded in the recording unit 102 for each type of clothing and for each capacity, in the case of mixed clothing, if it is possible to detect a drying rate of 95% for fast-drying clothing (for example, synthetic clothing), The drying rate of the entire mixed garment can be set to a certain level or more over time from the experimental results. Therefore, these experimental data are recorded in the recording unit 102 in advance.

  Next, it is difficult to directly detect the drying rate in the drying process. Here, the conductive (metal) rotary tank 2 is always in contact with the clothing a, and a resin material is provided at a certain distance from the rotary tank 2. A conductive (metal) lid back plate 9 is provided at the front of the non-conductive washing tub 3, and the resistance value is detected by contacting the clothing between the two electrodes. The detection unit 104 determines that the contact state is reached when the value falls to a certain value, and the contact state is determined when the value exceeds a certain value.

  Therefore, as shown in FIG. 5, the detection unit 104 periodically detects the resistance value between the electrodes at a constant time interval (for example, 100 ms), and contacts within a fixed period (for example, 100 ms × 600 pieces = 1 minute). The count of the number of detections in the state is plotted in FIG. 5 as the contact frequency (for example, the number of contacts within 600 per minute), and the count is less than a certain value (N times in FIG. 5). It is determined that the dry state has been detected. The elapsed time at that time is T1 in the case of synthetic clothing and T2 in the case of cotton clothing.

  Therefore, since the condition where the clothes between the electrodes are in contact with each other becomes a certain resistance value or more, that is, the drying rate is 95%, the resistance value is determined from the experimental value in advance with the detection sensitivity as the condition. Is. The resistance value varies depending on the type of water. However, since the resistance value is almost determined by the area (country) to be used, a resistance value for determining contact is set according to the destination. The detection unit 104 can determine that the drying rate of 95% has been exceeded from the number of contact (specified resistance value) counts between the electrodes.

  Next, the determination unit 103 refers to the data of the drying time and the drying rate having the same capacity as the clothing amount initially determined by the clothing amount determination unit 105 from the recording unit 102, and the detection unit 104 sets the drying rate to 95%. The time T1 determined to be detected is determined to be easy-to-dry synthetic garment, and the time difference Ts from the time T2 when the dry rate of the cotton garment with a slow drying rate is 95% is obtained. The drive unit 101 and the motor 11 are controlled and operated so as to continue drying for a time Ts from the time detected as%.

  Thereby, even if it is clothing with a slow dry degree, while being able to raise a drying rate to 95% at the minimum, drying time can be shortened as much as possible.

  In addition, when the determination unit 103 determines the correction time, there are extended times Ta and Tb determined in advance after detection of the drying rate of 95% for each type of clothing, and the clothing further dries by that time, and the drying rate is 98%. In some cases, it may be possible to ensure a minimum of 95% by raising to the extent, and from the stability of the drying rate, the time (Tb + Ts) added to the extended time Tb and the differential time Ts of the slow-drying clothing is corrected time As another method, the driving unit 101 and the motor 11 may be controlled and operated so as to continue the drying by further extending from the time detected by the detecting unit 104 as the drying rate of 95%. Even clothes with a low degree can be reliably prevented from being dry.

  Further, when the determination unit 103 determines the correction time, the sum of the time (Tb + Ts) obtained by adding the difference time Ts for each clothing type to the normal extension time Tb for clothing having a slow drying degree and the extension time for each clothing type ( (Ta + Tb) may be compared, and the shorter time may be determined as the correction time. As a result, it is possible to ensure a drying rate of 95% or more, without needlessly extending the drying time, and to realize energy saving and time reduction.

  Furthermore, when the drive motor in the compressor 51 of the heat pump device 5 is the induction motor 52, it can be driven only at a constant speed, so it is necessary to temporarily stop during operation due to the restriction of the discharge temperature and discharge pressure of the compressor 51. In this case, the temperature difference between the discharge temperature and the return temperature can be measured for a certain period of time, and the degree of drying can be determined by the degree of change in the temperature difference. In the heat pump device 5 using this induction motor 52, there is no continuity of the temperature once stopped and the degree of drying cannot be determined. However, in the method of the present invention, it is not necessary to measure the discharge temperature and the return temperature, and it can be easily determined from the contact of clothes with the electrodes and experimental data.

Here, an example is shown in which the resistance value between the electrodes is determined so that the drying rate detected by the detection unit 104 is 95%, but the resistance value is set by setting the drying rate to 90%, 93%, or the like. Since it is possible to determine, it is possible to obtain the same operation and effect even if the detection unit 104 determines that the drying rate should be determined arbitrarily.

  In addition, the extended times Ta and Tb determined for each clothing type also show an example determined by setting the initial drying rate to 95% and the drying rate after the extended time to 98%. Since the extension time is determined by determining how much the drying rate is improved, a method of arbitrarily determining or a method of arbitrarily determining from the recording data of the recording unit 102 may be employed.

  Further, the detection unit 104 that detects the resistance value at the time of contact between the electrodes detects that the fixed time interval is 100 ms, and counts the number of detections in the contact state with a fixed period of 100 ms × 600 = 1 minute. However, when looking at the change in resistance value of clothing A, it is possible to improve the accuracy by detecting at shorter intervals and increasing the detection frequency, but it depends on the amount of data and the performance of the control unit 10. It may be determined arbitrarily, and does not prescribe a time interval or a detection period.

  Therefore, in the drying process, the rotating tub 2 rotates at a rotational speed of about 45 rpm, the clothes a are lifted to the upper part of the rotating tub 2 when rotating, and warm air blown out from the pipe 6 into the washing tub 3 when falling. As a result, the clothes are dehumidified, and at the same time, are moved toward the front of the rotary tub 2 by hot air. The movement of the clothes i by the hot air varies depending on the degree of dryness of the clothes i. The degree of dryness of the clothes i varies depending on the type of clothes, and those that are easy to dry such as synthetic fibers dries quickly, so it is easy to move to the front of the rotary tank 2 in a short time from the start of drying by warm air. Become.

  On the other hand, cotton clothes, etc., are slow to dry, so the warm air reduces the movement to the front part of the rotating tub 2 and the movement to the front part of the rotating tub 2 does not occur for a long time after the start of drying. It is in a state of not progressing and moves to the front after a sufficient drying time. Therefore, in the mixed clothing, easy-to-dry items such as synthetic fibers are likely to gather at the position of the lid back plate 9 in the front part of the rotating tub 2, so that drying is detected early by the easy-to-dry clothing, and slow-drying clothing is detected. Even when it is in a state where it is not dried, the dry correction is performed even when fast drying clothes and slow clothes are mixed due to a change in drying rate and time for each type of clothing in the recording unit 102 in advance. By determining the time, the drying rate can be reliably maintained at a certain value or more.

  Therefore, in the mixed garment, the drying rate of the entire garment actually does not achieve the target value even after the drying is detected.

  In addition, when the capacity of the clothes is a certain capacity or more, for example, a rated capacity of 3 kg, the clothes in the rotating tub 2 are largely biased even if the clothes in the rotating tub 2 are blown by the air blower 7. Since there is almost no movement, uniform movement or change in the arrangement of clothes, mixed clothing contacts between the electrodes uniformly, and the resistance value change at the time of contact is stable, and the detection of a drying rate of 95% The drying rate of the entire mixed clothing is almost the same.

  Therefore, a stable drying rate can be obtained only by performing only the normal extended time Ta or Tb. Therefore, by determining the drying correction time only when drying a small volume of clothing below a certain volume, it is possible to achieve a stable drying rate at all capacities and extend wasted drying time. Energy savings can be improved without doing so.

Here, the rotating tub 2 is made of a conductive metal and always contains washing water. Therefore, the rotating tub 2 is connected to the main body 1 of the drum-type washing / drying machine via a bearing of the rotating shaft, and is used as an electric leakage countermeasure. It is configured to be connected to the ground electrode. Further, the lid back plate 9 as the other electrode is made of a metal electrode provided in the non-conductive washing tub 3 and is insulated from the ground electrode, so that a DC voltage is applied between the two electrodes. Thus, the resistance value between the two electrodes can be measured regardless of the influence of the induction of the commercial power supply frequency from the ground electrode side.

  In addition, by using the rotating tank 2 whose one side electrode is grounded, the lid back plate 9 can be provided with a certain distance from the rotating tank 2, and an electrode can be provided on the entire circumference of the clothing input port of the rotating tank 2, The frequency with which the clothing comes into contact with the two electrodes can be increased, and the detection accuracy can be improved.

  As described above, the drum dryer according to the present invention can prevent the clothes from being dried in a state of being dried, regardless of the capacity of various kinds of mixed clothes in the drum. It is useful as a drum dryer.

2 Rotating tank (electrode B)
3 Washing tank 5 Heat pump device (heating unit)
53 Heat Exchanger 7 Blower 9 Lid Back Plate (Electrode A)
DESCRIPTION OF SYMBOLS 10 Control part 102 Recording part 103 Determination part 105 Clothing amount determination part 11 Motor

Claims (8)

A rotating tub with conductivity that has an opening on the front side and accommodates clothing;
A motor for driving the rotating tank;
A washing tub enclosing the rotating tub rotatably;
A heating unit for heating air;
An air blowing unit for blowing air heated by the heating unit into the washing tub;
An annular electrode provided on the front side of the washing tub;
A detection unit for detecting the dryness of clothes,
The detection unit is a drum dryer connected to the rotating tank and the annular electrode. A determination unit for determining the degree of drying of the clothes from the conductive characteristics between the rotating tub and the electrode;
A recording unit that holds the drying time for each capacity according to the type of clothing in advance,
A clothing amount determination unit for detecting the amount of clothing in the washing tub;
A control unit for controlling the aircraft,
The determination unit is configured to determine a correction time for a drying process after the determination of drying detection of the determination unit from the drying time for each clothing of the recording unit when the clothing amount determination unit determines that the amount is equal to or less than a predetermined capacity. The drum dryer according to claim 1. The drum dryer according to claim 2, wherein the determination unit sets the correction time to a time obtained by adding a difference time for each clothing type to a normal extension time for slowly drying clothing. The drum dryer according to claim 2, wherein the determination unit sets the correction time as a difference time between slow-drying clothing and fast-drying clothing. The determination unit compares the time obtained by adding the difference time for each clothing type to the normal extension time for slowly drying clothing and the sum of the extension times for each clothing type, and requests the shorter time as the correction time. Item 3. A drum dryer according to Item 2. The drum-type dryer according to claim 2, wherein the heating unit is a heat pump device in which a motor for driving the compressor is an induction motor. The drum dryer according to claim 2, wherein the recording unit holds a drying time for each capacity of cotton clothing and synthetic clothing. The judgment part
One electrode grounded via the bearing of the rotating shaft of the rotating tank,
It is arranged in parallel with a certain distance in front of the rotating tub, and is configured with electrodes on the entire circumference of the opening of the washing tub,
2. A drum dryer according to claim 1, wherein a DC voltage is applied between the electrodes.