JP2007289494A - Clothes dryer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately judge the clogging state of a filter and to report it in a clothes dryer for drying clothes by circulating air in a drying chamber through a ventilation path where the evaporator and condenser of a heat pump are disposed by a blowing fan device. <P>SOLUTION: When the fan motor 27 of the blowing fan device is maintained at a fixed rotating speed, driving signals output from a control circuit 53 are compared with initial driving signals (driving signals in the state without clogging) stored beforehand, and when the difference is a fixed value or more, clogging is judged. Thus, including a filter, the evaporator and the condenser present in the ventilation path, lint sticking for reducing a circulating air amount such that a drying performance can not be maintained is detected. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a clothes dryer having a heat pump for drying laundry.

  In a clothes dryer equipped with a heat pump, the air in the drying room that houses the laundry (clothing) is circulated through the ventilation path in which the evaporator and condenser of the heat pump are arranged, and the air is evacuated by the evaporator. After cooling and dehumidifying, the cooled and dehumidified air is heated with a condenser and sent to the drying room, and the air dehumidified from the laundry in the drying room is repeatedly passed through the ventilation path, The laundry is dried.

  By the way, when the laundry is dried, lint (thread waste) comes out of the laundry. This lint is carried by the air flowing out of the drying chamber, enters the ventilation path, adheres to the evaporator and the condenser, and obstructs the air flow. Further, these lints also hinder contact (heat exchange) between the evaporator or condenser and air. Therefore, a filter for capturing lint is generally provided in the ventilation path on the upstream side of the evaporator and the condenser.

  Lint gradually adheres to the filter provided on the upstream side of the evaporator and the condenser. And if the amount of lint adhering to the filter increases, a so-called clogging state occurs and the air flow rate is remarkably reduced, which impedes the drying operation. Therefore, as one method for notifying the cleaning time of the filter, it is conceivable to store the number of times of the drying operation and perform clogging notification when the drying operation is performed a predetermined number of times.

  However, in the method of reporting clogging based on the number of times of drying operation, there is not always a proportional relationship between the number of operations and the amount of lint attached, so clogging is possible even in a state where cleaning is not yet required. Even if the notification is performed or, conversely, clogging actually occurs, there is a problem that the notification is not performed if the number of times of operation is small.

  This invention is made | formed in view of said situation, The objective is to provide the clothes dryer which can perform the determination of a clogging state more correctly.

  The present invention provides a clothes dryer in which air in a drying room is circulated through a ventilation path provided with an evaporator and a condenser of a heat pump by a blower fan device to dry laundry, and the ventilation path includes the air in the ventilation path. A filter disposed upstream of the evaporator and the condenser and detachably disposed so as to capture lint from the air passing through the ventilation path and a fan motor of the blower fan device at a predetermined rotational speed Is compared with an initial drive signal stored in advance, and when the difference is greater than or equal to a certain value, a determination unit that determines clogging, and a notification that performs a notification operation when the determination unit determines clogging Means.

  According to the present invention employing the above-described means, the drive signal at the predetermined rotational speed of the fan motor is compared with the initial drive signal, and when the difference is equal to or greater than a certain value, it is determined that clogging occurs. Can be determined more accurately. Moreover, not only clogging of the filter, but also when the lint adheres to the evaporator or the condenser disposed in the ventilation path and is clogged, this can be detected and notified.

Hereinafter, an embodiment in which the present invention is applied to a washing / drying machine will be described with reference to the drawings. FIG. 2 shows the overall configuration of the drum-type washing and drying machine. A water tank 2 is arranged in the outer box 1, and a rotating tank (drum) 3 is arranged in the water tank 2. The water tank 2 is elastically supported by a plurality of suspensions 4 (only one is shown), and the support form is a horizontal axis in which the axial direction of the water tank 2 (rotating tank 3) is the front-rear direction, and is lifted forward. It is inclined.
Both the water tank 2 and the rotating tank 3 have a cylindrical shape with the front surface portion opened. Among these, the front opening part of the water tank 2 and the laundry entrance / exit 5 formed in the front part of the outer box 1 are connected by a bellows 6. The outer box 1 is provided with a door 7 for opening and closing the entrance 5.

  A water supply case 9 containing a water supply valve 8 shown in FIG. 1 is disposed inside the outer box 1. The water supply valve 8 is connected to a water tap through a hose, and supplies tap water into the water tank 2 during washing. The water supplied into the water tank 2 enters the rotary tank 3 through a large number of small holes 3a formed in the peripheral side portion of the rotary tank 3 and a plurality of relatively large vent holes 10 formed in the rear end surface portion. Supplied.

A drain port 11 is formed at the bottom of the water tank 2, a drain valve 12 is connected to the drain port 11, and a drain hose 13 is connected to the drain valve 12. Then, at the end of washing and at the time of dehydration, washing water and water dehydrated from the laundry are discharged to the outside through the drainage port 11 and the drainage hose 13.
A washing machine motor 14 is attached to the outside of the rear end surface of the water tank 2. The washing machine motor 14 is composed of a three-phase brushless DC motor, and its rotating shaft 14 a is connected to the rotating tub 3.

  Now, the warm air outlet 15 is formed in the front upper part of the water tank 2, and the warm air inlet 16 is formed in the rear end surface upper part. The hot air outlet 15 and the hot air inlet 16 are connected by a ventilation path 17. The ventilation path 17 is mainly a ventilation duct 19 disposed on the base plate 18 on the bottom surface of the outer box 1 and extending in the front-rear direction, and a return air duct 20 provided in communication with the warm air outlet 15 at the front surface of the water tank 2. , A connection hose 21 that connects one end (front end) side of the ventilation duct 19 and the return air duct 20, an air supply duct 22 that is provided outside the rear end surface of the water tank 2 in communication with the hot air inlet 16, and a ventilation duct It is comprised from the connection hose 23 which connects between the other end (rear end) side of 19 and the air supply duct 22. FIG.

  In the ventilation path 17, a blower fan device 25 is disposed on the discharge port 24 side which is the other end side of the ventilation duct 19. The blower fan device 25 includes a fan 26 and a fan motor 27 including a three-phase brushless DC motor that drives the fan 26. When the fan 26 is rotated, the air in the water tank 2 is discharged from the hot air. 15 is sucked into the ventilation path 17 and is circulated in the ventilation path 17 from the front side to the rear side of the outer box 1 so as to be returned from the warm air inlet 16 into the water tank 2. The air circulation as described above is indicated by an arrow A in FIG.

  Further, in the ventilation duct 19 in the ventilation path 17, an evaporator 28 is disposed on the front side that is the upstream side, and a condenser 29 is disposed on the rear side that is the downstream side. Both the evaporator 28 and the condenser 29 are of a finned tube type in which a large number of heat transfer fins 28b and 29b are arranged in parallel at a fine pitch on the refrigerant flow pipes 28a and 29a. The air exchanges heat with the circulating air. And these evaporator 28 and the condenser 29 comprise the heat pump 32 with the compressor 30 and the throttle valve 31, as the cycle block diagram of FIG. 4 shows.

  In order to prevent lint from adhering to the evaporator 28 and the condenser 29 disposed in the ventilation path 17, particularly in the ventilation duct 19, for example, the ventilation side upstream of the evaporator 28 and the condenser 29. A filter 34 is disposed at the suction port 33 portion of the duct 19. As shown in FIG. 3, the filter 34 is formed by stretching a mesh-like filter element 34 a inside the frame 35 and providing a handle 36 on the frame 35, and is formed on the front surface of the outer box 1. The filter element 34 a portion can be inserted into the suction port 33 portion of the air duct 19 through the attachment / detachment port 37. Note that the handle portion 36 is hollow, and when the filter 34 is taken out, as shown by a two-dot chain line in FIG. 3, the upper handle portion 36a can be hooked.

  FIG. 1 shows the electrical configuration of the washing / drying machine, and two rectifier circuits 39 and 40 are connected to a commercial AC power supply 38 of 100V. Smoothing capacitors 41a, 41b and 42a, 42b are connected between the output terminals of these rectifier circuits 39 and 40. Then, by connecting the common connection point of the smoothing capacitors 41a and 41b and the common connection point of the smoothing capacitors 42a and 42b to one terminal of the commercial AC power supply 38, the rectifier circuit 39 and the smoothing capacitors 41a and 41b are connected to each other. A first DC power supply circuit 43 that is a voltage doubler rectifier circuit is configured, and a second DC power supply circuit 44 that is a second voltage doubler rectifier circuit is configured by the rectifier circuit 40 and the smoothing capacitors 42a and 42b. .

  The first DC power supply circuit 43 is for driving the washing machine motor 14 with an inverter, and its output terminal is connected to the inverter main circuit 45. The washing machine motor 14 is connected to the output terminal of the inverter main circuit 45. The second DC power supply circuit 44 is for driving the fan motor 27 with an inverter, and its output terminal is connected to the inverter main circuit 46. A fan motor 27 is connected to the output terminal of the inverter main circuit 46. The inverter main circuits 45 and 46 are configured by a three-phase bridge circuit composed of switching elements such as switching transistors.

  The washing machine motor 14 and the fan motor 27 are controlled by a pulse width modulation (PWM) method. That is, PWM forming circuits 49 and 50 are connected to the drive circuits 47 and 48 that drive the switching transistors of the inverter main circuits 45 and 46 of the washing machine motor 14 and the fan motor 27. The washing machine motor 14 and the fan motor 27 are connected to frequency generators 51 and 52 as speed detecting means for detecting the rotational speed, and the speed detection signals of these frequency generators 51 and 52 are as follows. , Input to the control circuit 53 as a control means.

  The control circuit 53 compares the rotational speeds of the washing machine motor 14 and the fan motor 27 detected by the frequency generators 51 and 52 with the command speed to determine a speed deviation, and a voltage signal corresponding to the speed deviation. Is sent to the PWM forming circuits 49 and 50 (drive signal generating means). Then, the PWM forming circuits 49 and 50 form a PWM signal with a duty corresponding to the input drive signal and output it to the drive circuits 47 and 48. Drive circuits 47 and 48 perform on / off control of switching transistors of inverter main circuits 45 and 46 based on the input PWM signal. Thereby, the input voltage of the washing machine motor 14 and the fan motor 27 is controlled, and the washing machine motor 14 and the fan motor 27 are controlled to rotate at the command speed. Therefore, the inverter main circuits 45 and 46 function as input voltage control means.

  By the way, in order to accurately control the rotation speed of the fan motor 27 in accordance with the command speed, it is necessary to consider the voltage fluctuation of the commercial AC power supply 38. That is, if the voltage of the commercial AC power supply 38 is higher than 100V, the output voltage of the second DC power supply circuit 44 that is the DC power supply of the fan motor 27 becomes higher than 280V that is the normal voltage. Then, even if the inverter main circuit 46 is controlled by the PWM signal having the same duty, the rotational speed of the fan motor 27 is increased. On the contrary, if the voltage of the commercial AC power supply 38 is lower than 100V, the rotational speed of the fan motor 27 is lowered even if the inverter main circuit 46 is controlled by the PWM signal having the same duty.

  Therefore, as a power supply voltage detecting means for detecting the output voltage of the commercial AC power supply 38, a voltage dividing resistor circuit 54 is connected between a pair of output terminals of the first DC power supply circuit 43, and the two resistors 54a and 54b are common. The voltage at the connection point is input to the control circuit 53. Then, the control circuit 53 obtains the output voltage (the power supply voltage of the fan motor 27) of the first DC power supply circuit 43 and, consequently, the second DC power supply circuit 44 by the voltage signal from the voltage dividing resistor circuit 54. Yes. The voltage of the commercial AC power supply 38 is detected, and the output voltage of the second DC power supply circuit 44 is obtained therefrom.

The control circuit 53 is mainly composed of a microcomputer (not shown). The control circuit 53 includes an operation unit 55 including a plurality of switches for inputting operation details of the washing / drying machine, An indicator 56 for displaying the stroke during operation and the like, a water level switch 57 for detecting the water level in the water tank 2 are connected, and the water supply valve 8, the drain valve 12, and the compressor 30 of the heat pump 32. Etc. are connected via a drive circuit 58. The control circuit 53 has, for example, an EEPROM 59 as storage means. The operation unit 55 and the display 56 are provided on the upper front side of the outer box 1.
The first DC power supply circuit 43 functions as a DC power supply for the washing machine motor 14, and is connected to the control circuit 53, the display 56, and the like via a step-down circuit (not shown) to serve as the DC power supply. Also works.

Next, the operation of the above configuration will be described. When the washing operation is completed and the drying operation is started, the control circuit 53 drives the compressor 30 and the fan motor 27 of the heat pump 32 while driving the washing machine motor 14. Then, the air in the water tank 2 is sucked into the ventilation duct 19 from the hot air outlet 15 through the return air duct 20 and the connection hose 21 as indicated by an arrow A in FIG.
Further, the refrigerant is compressed by the compressor 30 of the heat pump 32, becomes a high-temperature and high-pressure refrigerant, flows into the condenser 29, and exchanges heat with the air flowing in the ventilation duct 19. As a result, the air flowing through the ventilation duct 19 is heated, and conversely, the refrigerant is cooled and liquefied. The liquefied refrigerant flows into the evaporator 28 through the throttle valve 31, where it is vaporized and sucked into the compressor 30. Thereby, the evaporator 28 cools the air flowing through the ventilation duct 19.

  As described above, the air flowing into the ventilation path 17 from the water tank 2 is cooled by the evaporator 28 and dehumidified, and then heated by the condenser 29 to be warmed. Then, the warm air is supplied from the warm air inlet 16 into the water tank 2 through the connection hose 23 and the air supply duct 22, and further flows into the rotary tank 3 through the small holes 3 a and the ventilation holes 10. The warm air that has flowed into the rotary tub 3 takes moisture from the clothing, and then flows into the ventilation duct 19 from the warm air outlet 15 via the return air duct 20 and the connection hose 21. Thus, the air in the rotating tub 3 is circulated between the ventilation duct 19 in which the evaporator 28 and the condenser 29 are arranged, and the laundry in the rotating tub 3 is dried. The drying rate detecting means for detecting the drying rate of the laundry, for example, the drying rate detecting means for detecting the moisture content of the laundry contacting the pair of electrodes (not shown) by the electrical resistance of the laundry is a predetermined value or more. When the drying rate is detected, the drying operation ends. During such a drying operation, the inside of the rotary tank 3 functions as a drying chamber.

  Now, in the above-described drying operation, the lint spattered from the laundry is carried to the air coming out of the rotating tub 3 and flows into the return air duct 20 and the connection hose 21, and at the suction port 33 portion of the ventilation duct 19, Captured by the filter 34. Therefore, the lint adheres to the evaporator 28 and the condenser 29 in the ventilation duct 19 and obstructs the flow of air, and prevents the evaporator 28 and the condenser 29 from contacting air (heat exchange). It is prevented as much as possible.

  If lint is trapped in the filter 34 and is accumulated, it becomes an obstacle to the flow of air, and the amount of circulating air through the ventilation path 17 decreases. However, in order to maintain good drying performance, a reduction in the circulating air volume through the ventilation path 17 must be avoided. The reason is that when the air is warmed by the condenser 29, the heat generation temperature of the condenser 29 is lower than that of the electric heater, so that it is difficult to make the air as hot as in the case of the electric heater heating method. However, even if the temperature is not so high, if the amount of circulating air is increased, good drying performance can be exerted. Therefore, in the case of the condenser heating method as in this embodiment, the circulating air volume is reduced. I try to do more.

  Under such circumstances, it is necessary to clean the filter 34 when a certain amount of lint adheres to the filter 34. Therefore, in the present embodiment, it is determined by the energization signal when the fan motor 27 is controlled to a predetermined rotational speed that it is time to clean the filter 34 (this determination is referred to as clogging detection). I have to.

  That is, the fan motor 27 is driven simultaneously with the start of the drying operation, and is controlled so as to increase the rotational speed by a constant speed per unit time as shown by a solid line in FIG. When the rotational speed reaches a predetermined rotational speed Fs, the fan motor 27 is controlled to rotate at a constant speed so as to maintain the rotational speed (hereinafter, steady rotational speed) Fs. In the constant speed rotation control of the fan motor 27, the control circuit 53 compares the steady rotation speed Fs with the actual rotation speed of the fan motor 27, and outputs a drive signal corresponding to the speed deviation to the fan motor 27. By controlling the input voltage, the rotation speed is controlled to be constant.

  When the amount of lint captured by the filter 34 increases or when a large amount of lint adheres to the heat transfer fins 28b and 29b of the evaporator 28 and the condenser 29, the ventilation resistance of the ventilation path 17 increases, The load depends on the draft resistance. When the load increases, the fan motor 27 decreases the rotation speed in accordance with the increase in the load. However, in the constant speed rotation control, the control circuit 53 maintains the fan motor 27 at a constant steady rotation speed Fs. As shown in FIG. 6, as indicated by a two-dot chain line, a drive signal (command voltage) is output so as to increase the input voltage of the fan motor 27 in accordance with the speed deviation. Therefore, if the magnitude of the drive signal for the fan motor 27 is detected, the ventilation resistance of the ventilation path 17, that is, the clogging of the filter 34 can be detected. Since the drive signal is actually output as a voltage, it is hereinafter referred to as a command voltage.

  From the above, in this embodiment, the magnitude of the command voltage Vsp in the case of constant speed rotation control to the steady rotation speed Fs is set to the filter 34, the evaporator 28, and the condenser 29 at the time of factory shipment of the washing dryer. It is compared with the initial command voltage Vsp0 in a clean state in which no lint is adhered, and when the difference is equal to or greater than a predetermined value α, it is determined that clogging has occurred. The initial command voltage Vsp0 is for controlling the fan motor 27 to the steady rotational speed Fs with the normal output voltage (280V) of the second DC power supply circuit 44 in the clean state, and is stored in the EEPROM 59 in advance. .

  Here, the clogging detection operation of the present embodiment will be described with reference to the flowchart of FIG. First, when the fan motor 27 is activated by the start of the drying operation and the rotation speed detected by the frequency generator 52 reaches the steady rotation speed Fs, the control circuit 53 uses the voltage dividing resistance from the voltage dividing resistance circuit 54 to perform the first operation. The output voltage of the DC power supply circuit 43 (power supply voltage of the fan motor 27) Vdc is detected (step S1). Next, the control circuit 53 detects the command voltage Vsp (step S2), and corrects the command voltage Vsp according to the output voltage of the first DC power supply circuit 43 (step S3; correction means).

  In this correction of the command voltage Vsp, since the output voltage of the second DC power supply circuit 44 fluctuates due to voltage fluctuations of the commercial AC power supply 38, the fluctuation is corrected and the output voltage of the second DC power supply circuit 44 is correct. This is for conversion to a command voltage at 280V. When the corrected command voltage is represented by a corrected command voltage VspF, the correction formula in step S3 is VspF = Vsp + η × (Vdc−Vdc0).

  After calculating the correction command voltage VspF, the control circuit 53 compares the correction command voltage VspF with the initial command voltage Vsp0 to calculate the difference (| VspF−Vsp0 |) (step S4), and the difference is a predetermined value. It is determined whether or not α is greater than or equal to (step S5: determination means). If | VspF−Vsp0 | is less than the predetermined value α, the control circuit 53 determines that the filter 34 is not clogged (“NO” in step S5), and writes the correction command voltage VspF in the EEPROM 59. At the same time, the clogging detection count EN stored in advance in the EEPROM 59 is cleared to 0 (step S6). Thereafter, the control circuit 53 continues the drying operation as it is (step S7), and ends when the end of drying is detected ("YES" in step S8).

  Incidentally, when the amount of lint attached to the filter 34 increases, the ventilation resistance of the ventilation path 17 increases, so that the correction command voltage VspF increases. Then, in step S5 in which the correction command voltage VspF is compared with the initial command voltage Vsp0, if | VspF−Vsp0 | is equal to or greater than a predetermined value α, the control circuit 53 determines that the filter 34 is clogged (step “YES” in S5), the correction command voltage VspF is set as a clogging detection voltage VspE (step S9), and the clogging detection voltage VspE exceeds a predetermined value γ or the number of clogging detections stored in the EEPROM 59. It is determined whether EN has exceeded a predetermined number of times β (step S10: abnormal clogging determination means).

  When the clogging detection voltage VspE does not exceed the predetermined value γ, and the clogging detection number EN stored in the EEPROM 59 does not exceed the predetermined number β, the control circuit 53 uses the eyes stored in the EEPROM 59 in advance. The clogging detection voltage VspE is rewritten to the current clogging detection voltage, and 1 is added to the clogging detection number EN, and the value is stored as a new clogging detection number EN (step S11). After that, the control circuit 53 continues the drying operation as it is (step S12), and when the end of drying is detected (“YES” in step S13), the display unit 56 serving as notification means displays that the filter 34 is clogged. (Notification operation) is performed (step S14), and the end is reached.

  After the drying operation is completed, if the user notices that the filter 34 is clogged by the display on the display 56 and cleans the filter 34, the control circuit 53 at step S5 determines “NO” in the next drying operation. Then, the clogging detection count EN is cleared to 0, and thereafter, no clogging is displayed on the display unit 56 at the end of the drying operation.

  On the other hand, even if the clogging is displayed, if the notification is made without cleaning the filter 34, the control circuit 53 executes step S10 at the start of the subsequent drying operation, and the clogging detection voltage is detected. If it is determined that VspE exceeds the predetermined value γ or the clogging detection count EN stored in the EEPROM 59 exceeds the predetermined number β, the control circuit 53 assumes that the clogging has progressed abnormally, In step S10, “YES” is set, and the clogging detection voltage stored in the EEPROM 59 is rewritten to the current clogging detection voltage VspE, and the clogging detection number EN is rewritten to a value obtained by adding 1 to the current value (step). S15). Then, the control circuit 53 interrupts the drying operation (step S16) and displays a clogging on the display 56 (step S17).

  When the user who notices that the filter 34 is clogged by looking at the clogging display on the display 56 takes out the filter 34 and cleans it, and restarts the drying operation, the control circuit 53 performs the drying operation. Then, when the fan motor 27 has reached a predetermined rotational speed, the process after step S1 is executed. As described above, the control circuit 53 determines “NO” in step S5, Then, the clogging detection count EN is cleared to 0, and thereafter, no clogging is displayed on the display 56 when the drying operation ends.

  By the way, if used for a long period of time, lint may also adhere to the heat transfer fins of the evaporator 28 and the condenser 29, which may hinder ventilation. Then, the control circuit 53 detects clogging of the filter 34 and displays clogging at the end of the drying operation. In such a case, even if the filter 34 is taken out and the lint adherence state is observed, the lint is not so much adhered. From this, the user suspects that the lint adheres to the evaporator 28 or the condenser 29, and the service is suspected. A man will be called for inspection.

  In other words, the clogging detection in this embodiment can detect clogging between the heat transfer fins 28b and 29b of the evaporator 28 and the condenser 29 as well as the filter 34. In the inspection by the service person, since the command voltage VspE is stored in the EEPROM 59 as data when clogging is detected, the service person can read out the stored data of the EEPROM 59 and use it as a reference for the inspection work.

As described above, according to the present embodiment, clogging of the evaporator 28 and the condenser 29 as well as the filter 34 can be detected. In this case, the clogging detection is performed by comparing the voltage command value when the fan motor 27 reaches a predetermined rotational speed with the initial voltage command value, and the difference becomes equal to or greater than the predetermined value. When it becomes clogged, this can be detected and reported more accurately. Therefore, in the condenser 29 heating method in which a large amount of circulating air is set, a decrease in the circulating air volume can be detected and dealt with quickly, which is effective in maintaining good drying efficiency.
Further, in the present embodiment, the drying operation is continued until the end of drying without being interrupted until the number of continuous clogging detections reaches the predetermined number β, so that the drying operation is interrupted immediately when clogging is detected. The trouble of this can be eliminated.

The present invention is not limited to the embodiments described above and shown in the drawings, and can be expanded or changed as follows.
The drive signal for detecting clogging is not limited to the speed deviation signal output from the control circuit 53, and may be a duty generated based on the speed deviation signal by the PWM forming circuit 50. It may be an input voltage.
The predetermined rotation speed for detecting clogging is not limited to the steady rotation speed Fs. It may be a rotational speed on the way to the steady rotational speed Fs, and a drive signal for maintaining the rotational speed may be compared with an initial drive signal when there is no ventilation resistance.
The clogging notification may be performed by a buzzer.
You may apply to the clothes dryer provided only with the clothes drying function.

The circuit block diagram which shows one Embodiment of this invention Longitudinal side view of washer / dryer Enlarged sectional view of the filter part Cycle diagram of heat pump Flowchart for filter clogging detection Graph showing fan motor speed control mode

Explanation of symbols

  In the drawings, 2 is a water tank, 3 is a rotating tank (drying chamber), 14 is a washing machine motor, 15 is a hot air outlet, 16 is a hot air inlet, 17 is a ventilation path, 19 is a ventilation duct, 25 is a blower fan device, 26 is a fan, 27 is a fan motor, 28 is an evaporator, 29 is a condenser, 30 is a compressor, 32 is a heat pump, 34 is a filter, 43 and 44 are first and second DC power supply circuits, and 45 and 46 are Inverter main circuit, 47 and 48 are drive circuits, 49 and 50 are PWM forming circuits, 51 and 52 are frequency power generation circuits (rotation speed detection means), 54 is a voltage dividing resistor circuit (power supply voltage detection means), and 56 is a display. (Notification means), 59 is an EEPROM (storage means).

Claims (4)

In a clothes dryer in which air in a drying room is circulated through a ventilation path provided with an evaporator and a condenser of a heat pump by a blower fan device to dry the laundry,
A filter that is detachably disposed in the ventilation path on the upstream side of the evaporator and the condenser, and that captures lint from the air passing through the ventilation path;
A determination means for comparing a drive signal when the fan motor of the blower fan device is at a predetermined rotational speed with an initial drive signal stored in advance, and determining that the difference is equal to or greater than a predetermined value;
A clothes dryer comprising: an informing means for executing an informing operation when the judging means judges clogging.   2. The clothes dryer according to claim 1, further comprising a storage unit that stores at least a driving signal at that time when the determination unit determines that the blockage is clogged.   The drying operation is continued without interruption until the determination of clogging by the determination means exceeds a predetermined number of times, and the drying operation is interrupted when the determination of clogging continues for a predetermined number of times. The clothes dryer according to claim 1 or 2, wherein Power supply voltage detection means for detecting the power supply voltage of the fan motor;
4. The determination unit according to claim 1, wherein the determination unit compares the power supply voltage detected by the power supply voltage detection unit with a normal power supply voltage, and corrects the drive signal of the fan motor according to the difference. The clothes dryer according to crab.

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