JP2015042208A - Clothes dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clothes dryer capable of preventing deterioration of drying performance corresponding to decrease in a refrigerant flow rate, in the one using a capillary tube as a throttle of a heat pump.SOLUTION: A clothes dryer includes: first temperature detection means for detecting temperature of a refrigerant on an evaporator inlet side; and second temperature detection means for detecting temperature of the refrigerant on the evaporator outlet side. Also, on the basis of a difference Te of the detection temperature between the first and the second temperature detection means and a difference from a predetermined threshold value, it modifies rotational speed of a compressor and operation time for drying as well as rotational speed of a blower for circulation.

Description

  Embodiments described herein relate generally to a clothes dryer.

  Recent clothes dryers such as a washing dryer have a heater method and a heat pump method according to a drying method. Among them, the heater method supplies air heated by an electric heater to a drying room containing clothes to evaporate moisture from the clothes, thereby exhausting high-temperature and high-humidity air from the drying room and dehumidifying it with a dehumidifier. The clothes are dried by repeatedly heating the dehumidified air with the electric heater and supplying it to the drying chamber. Since the dehumidifying capacity is not sufficient, the heating temperature is set to about 90 ° C. It needs to be high, clothing is likely to shrink and be damaged, and power consumption is not small.

  On the other hand, in the heat pump system, the air in the drying room containing the clothing is passed through the ventilation path of the heat pump in which the compressor and the throttle are cycle-connected to the evaporator and the condenser. The air is cooled and dehumidified, the air is heated by a condenser, and the clothes are dried by repeating the sequential feeding into the washing tub. The heating temperature is 60 [° C. compared to the heater system. ] The degree is low, and it is difficult to cause shrinkage and damage of clothing, and power consumption is small.

A refrigerant is enclosed in the heat pump, and the refrigerant is compressed by a compressor, liquefied by a condenser, heated through the ventilation path, depressurized by a throttle, and then evaporated by an evaporator. By evaporating, the air passing through the ventilation path is cooled and dehumidified.
For this reason, in the heat pump, the flow rate of the refrigerant is an important factor, and when it decreases, the amount of refrigerant liquefied in the condenser decreases, and consequently the amount of heating of air passing through the ventilation path decreases. Further, when the flow rate of the refrigerant in the heat pump decreases, the amount of refrigerant evaporated in the evaporator decreases, and consequently the amount of dehumidification of the air passing through the ventilation path decreases. By these, the drying performance in a clothes dryer falls.

There are several factors in the reduction of the refrigerant flow rate in the heat pump, but in the case where a capillary tube is used as the throttle, this capillary tube is clogged. The capillary tube of the heat pump is a capillary tube having an inner diameter of about 1 [mm], and is easily clogged with foreign matters. Examples of the foreign matter that clogs the capillary tube include metal (copper) powder generated in the manufacturing process of the tube, and impurities generated due to aging of the tube.
In any case, when such a capillary tube is clogged, the flow rate of the refrigerant in the heat pump decreases, and the drying performance in the clothes dryer decreases.

  On the other hand, in the clothes dryer of which the drying method is a heat pump system, a temperature detecting means for detecting the temperature of the refrigerant at the inlet side of the refrigerant and a temperature detecting means for detecting the temperature of the refrigerant at the outlet side of the refrigerant are provided, When judging an abnormal decrease in the air volume (the amount of air circulated through the ventilation path) from the detected temperature difference, the compression capacity of the compressor is reduced, the degree of decompression of the expansion valve (squeezer) is increased, Furthermore, there is one that has been considered to notify the abnormality and prevent a decrease in drying performance (see, for example, Patent Document 1).

JP 2008-220448 A

  However, what was thought as described above does not detect a decrease in the refrigerant flow rate in the heat pump, and it does not use a capillary tube for the restrictor, and therefore uses a capillary tube for the restrictor of the heat pump. It was not possible to prevent a decrease in drying performance corresponding to the decrease in the refrigerant flow rate.

  In view of this, a clothes dryer is provided that can prevent a decrease in drying performance in response to a decrease in the flow rate of refrigerant in a heat pump using a capillary tube.

The clothes dryer of the present embodiment includes a drying chamber, an air circulation device that circulates the air in the drying chamber back to the drying chamber through a ventilation path provided outside the drying chamber by operation of the circulation fan, and the air circulation A refrigeration cycle in which an evaporator and a condenser are disposed in the ventilation path of the apparatus, and the refrigerant is circulated through the compressor, the condenser, the capillary tube, and the evaporator by connecting the compressor and the capillary tube to the evaporator and the condenser. In which the clothes are dried by the operation of the air circulation device and the heat pump,
First, the apparatus includes first temperature detection means for detecting the temperature of the refrigerant on the evaporator inlet side, and second temperature detection means for detecting the temperature of the refrigerant on the evaporator outlet side. Control means for correcting the rotational speed of the circulation fan is provided on the basis of the difference between the detected temperature of the first and second temperature detecting means and a preset threshold value.

  Secondly, the clothes dryer of the present embodiment includes a first temperature detecting means for detecting the temperature of the refrigerant on the evaporator inlet side, and a second temperature detection for detecting the temperature of the refrigerant on the evaporator outlet side. And a control means for correcting the rotational speed of the compressor based on a difference between the detected temperature of the first and second temperature detecting means and a preset threshold value. It is characterized by that.

  Thirdly, in the clothes dryer of the present embodiment, the first temperature detecting means for detecting the temperature of the refrigerant on the evaporator inlet side and the second temperature detection for detecting the temperature of the refrigerant on the evaporator outlet side. And a control means for correcting the drying operation time based on the difference between the detected temperatures of the first and second temperature detecting means and a preset threshold value. It is characterized by.

The figure which shows the control content of one Embodiment Schematic longitudinal side view of the entire clothes dryer (washing dryer) with a part broken Schematic longitudinal rear view of the entire clothes dryer (washing dryer) with a part broken away Schematic configuration diagram of air circulation device and heat pump Electrical configuration block diagram The figure which shows the temperature change of each part at the time of normal of an air circulation device and a heat pump The figure which shows the temperature change of each part at the time of abnormality of an air circulation device and a heat pump

Hereinafter, the present invention is applied to a washing / drying machine, and an embodiment thereof will be described with reference to the drawings.
First, FIG. 2 and FIG. 3 show the overall configuration of a washing / drying machine, especially a drum type (horizontal axis) washing / drying machine. A rotating tub (drum) 3 is disposed inside. In the present embodiment, the outer tub 2 and the rotating tub 3 constitute a drying room that also serves as a washing room. The rotating tub 3 has a porous shape having holes 4 in the entire area of the peripheral side wall.

  Both the outer tub 2 and the rotating tub 3 form a horizontal-axis cylindrical shape in which the axial direction is front and rear (left and right in FIG. 2), and is elastically supported by a suspension (not shown) so as to rise upward. The outer tub 2 and the rotating tub 3 are both open at the front, whereas the front of the outer box 1 and the upper inclined portion of the outer box 1 are opened and closed by a door 5 (illustrated). The clothing doorway and the opening on the front surface of the outer tub 2 are connected by a bellows (not shown).

A motor 6 is attached to the back surface of the outer tub 2. The motor 6 is, for example, an outer rotor type brushless motor, and is configured to directly rotate the rotating tub 3. Therefore, the motor 6 functions as a driving device that rotationally drives the rotating tub 3.
In addition, a drainage pipe 8 having an electric drain valve 7 is connected to the bottom of the bottom, which is the lowermost part of the outer tub 2, and the water in the outer tub 2 is removed from the machine by this drainage pipe 8. To be discharged.

  A ventilation duct 9 is disposed below the outer tub 2 (the bottom of the outer box 1). As shown in FIG. 3, the ventilation duct 9 is a box that is long to the left and right, and one end portion of the intake duct 11 through a flexible bellows-like flexible duct joint 10 at the upper end of one end portion (left side portion in FIG. 3). Is connected. The intake duct 11 is piped from the lower side to the upper side in the inner part of the outer case 1 (left side in FIG. 3) and forward as shown in FIG. 2, and the other end (upper front end) is connected to the front side. The filter device 12 is connected.

  The filter device 12 exclusively captures lint that scatters out of the laundry, and can be cleaned by attaching and detaching at the front portion of the upper surface portion of the outer box 1. Is connected to a hot air outlet 14 formed in the upper part of the front portion of the outer tub 2. That is, the hot air outlet 14 of the outer tub 2 is connected to the upper part of one end of the ventilation duct 9 via the flexible connection hose 13, the filter device 12, the intake duct 11, and the flexible duct joint 10. It is.

  On the other hand, a circulation fan 15 is provided at the other end of the ventilation duct 9 (right side in FIG. 3). More specifically, the circulation blower 15 houses a blower impeller 15b inside a casing 15a, and is driven to rotate by a motor 15c attached to the outside of the casing 15a. The other end portion is communicated with the inlet portion of the casing 15a.

  And the one end part of the air supply duct 17 is connected to the exit part of the casing 15a of the air blower 15 for circulation through the flexible duct couplings 16, such as a bellows shape. The air supply duct 17 is piped with the other side (right side in FIG. 3) in the outer box 1 bypassing the motor 6 portion upward from the lower part, and the other end (upper end) is connected to the outside It is connected to a hot air inlet 18 (see FIG. 2) formed in the upper part of the rear part of the tank 2.

  As a result, the flexible connecting hose 13, the filter device 12, the intake duct 11, the flexible duct joint 10, the ventilation duct 9, the casing 15 a of the circulation fan 15, the flexible duct joint 16, and the air supply duct 17 The hot air outlet 14 and the hot air inlet 18 of the outer tub 2 are connected, and a ventilation path 19 is provided outside the outer tub 2.

As shown by arrows in FIGS. 2 and 3, the circulation fan 15 circulates the air in the rotating tub 3 from the outer tub 2 to the outside of the outer tub 2 through the ventilation path 19 and then into the outer tub 2. And the circulation which returns to the inside of the rotation tank 3 is performed, Therefore, the air circulation apparatus 20 which circulates the air in the rotation tank 3 with the ventilation path 19 and the air blower 15 for circulation is comprised.
The motor 15c of the circulation fan 15 is supplied with a drive power having a set frequency by an inverter power supply (corresponding to the fan drive means), whereby the motor 15c has a rotation speed corresponding to the supplied frequency. And the circulation fan 15 is driven with a variable setting output.

  An evaporator 21 is disposed on the upstream side (left side in FIG. 3) and a condenser 22 is disposed on the downstream side (right side in FIG. 3) inside the ventilation duct 9 in the ventilation path 19. ing. The evaporator 21 and the condenser 22 constitute a heat pump 25 with the compressor 23 and the capillary tube 24 shown in FIG. 4. In the heat pump 25, the compressor 23 and the condenser 22 are connected by a connection pipe 26. The capillary tube 24, the evaporator 21, and the compressor 23 are cycle-connected in this order (refrigeration cycle), and the refrigerant sealed in the cycle is circulated by operating the compressor 23. .

  Although not shown in detail, the compressor 23 is, for example, a rotary type, and further includes a compression mechanism part and a motor part (not shown in detail). As with the blower 15, a drive power having a set frequency is supplied by an inverter power supply (corresponding to a compressor drive means). Thereby, the motor unit rotates at a rotation speed corresponding to the supplied frequency, and drives the compressor 23 with a variable setting output.

  FIG. 4 also schematically shows the outer tub 2 and the air circulation device 20 (the intake duct 11, the ventilation duct 9, the circulation fan 15, and the air supply duct 17) together with the heat pump 25. As a temperature detection means provided for the heat pump 25, a temperature sensor 27 for detecting the temperature (refrigerant temperature) on the outlet side of the compressor 23, a temperature sensor 28 for detecting the temperature of the condenser 22, and an inlet side of the evaporator 21 A temperature sensor (first temperature detection means) 29 for detecting the temperature (refrigerant temperature), a temperature sensor (second temperature detection means) 30 for detecting the temperature (refrigerant temperature) on the outlet side of the evaporator 21, are shown. The temperature sensor 31 for detecting the temperature (air temperature) on the inlet side (in the air supply duct 17) of the outer tub 2 (drying chamber) and the outlet side of the outer tub 2 (drying chamber) (evaporation of the ventilation duct 9) Temperature upstream of vessel 21 (empty) The temperature sensor 32 for detecting the air temperature) is shown.

  Here, although not shown in detail, the evaporator 21 and the condenser 22 are both provided with a pipe through which the refrigerant passes in a meandering shape in the vertical direction (vertical direction), and a pipe provided in the meandering shape in the vertical direction. It is arranged side by side in multiple rows in the horizontal direction (left and right direction), and heat transfer fins are arranged in the pipe in the horizontal direction (front and back direction) at small intervals of about 1.4 mm, for example. The arrangement of the heat transfer fins is orthogonal to the flow of the circulating air, and the circulating air passes between the heat transfer fins.

  A drain pan 33 shown in FIG. 2 and FIG. 3 is provided in a portion below the evaporator 21 and the condenser 22 of the ventilation duct 9, and frost attached to the evaporator 21 is dissolved and removed by the drain pan 33. A drain pump 34 for collecting the defrost water dripped from the evaporator 21 and pumping up the collected defrost water and discharging it through the drain pipe 8 is attached to the ventilation duct 9 as shown in FIG. ing.

  In addition, a water supply valve 35 shown in FIG. 3 is provided in the inner upper portion of the outer box 1, and the water supply valve 35 is connected to a water faucet via a connection hose (not shown) at the inlet, Is connected to the outer tub 2 via a connection hose 36 so that tap water is supplied into the outer tub 2.

  FIG. 5 shows a control device 37, which is arranged inside the outer box 1 and is composed of, for example, a microcomputer, and controls the overall operation of the washing / drying machine. It functions as a control means. The control device 37 receives various operation signals from an operation unit 38 including various operation switches on an operation panel (not shown) for a user to perform operations related to the operation of the washing / drying machine, and the outer tub A water level detection signal is input from a water level sensor 39 provided so as to detect the water level in 2, and each temperature detection signal is input from the temperature sensors 27 to 32.

  Thus, the control device 37, based on those inputs and a previously stored control program, the water supply valve 35, the motor 6, the drain valve 7, the circulation fan 15 (motor 15c), and the compression The machine 23 is driven and controlled via the drive circuit 40.

Next, the operation of the washing / drying machine having the above configuration will be described.
First, when an operation panel (not shown) is operated by the user to set a course of driving and an instruction to start driving is given, the control device 37 performs a washing operation, a drying operation, or the like according to the set driving course. A washing / drying operation is performed in which both operations are performed. As one of them, when the execution of the washing and drying operation is started, the washing process, the dehydrating process, and the drying process are executed in order.

In the washing process, water is supplied into the outer tub 2 through the connection hose 36 by opening the water supply valve 35, and thereafter, the operation of rotating the rotating tub 3 alternately in both forward and reverse directions at a low speed is performed.
In the dehydration process, after the drain valve 7 is opened and the water in the outer tub 2 is discharged through the drain pipe 8, the rotation tank 3 is rotated in one direction at a high speed.
In the drying process, an operation of supplying hot air into the rotating tank 3 is performed while the rotating tank 3 is alternately rotated in both forward and reverse directions at a low speed.

  Specifically, the operation of supplying the warm air into the rotary tank 3 is performed by driving the circulation fan 15 and driving the compressor 23 of the heat pump 25. By driving the circulation fan 15, the air in the rotating tub 3 flows from the outer tub 2 into the ventilation duct 9 through the intake duct 11 of the ventilation path 19.

  On the other hand, when the compressor 23 of the heat pump 25 is driven, the refrigerant sealed in the heat pump 25 is compressed by the compressor 23 to become a high-temperature and high-pressure refrigerant, and the high-temperature and high-pressure refrigerant flows through the pipe of the condenser 22 and Heat is exchanged with the air in the ventilation duct 9 through the heat transfer fins. As a result, the air in the ventilation duct 9 is heated, and conversely, the refrigerant in the pipe of the condenser 22 is liquefied at a reduced temperature. The liquefied refrigerant is then depressurized through the capillary tube 24 and then flows through the pipe of the evaporator 21 to be vaporized. Thereby, the evaporator 21 cools the air in the ventilation duct 9 through a pipe and a heat-transfer fin. The refrigerant that has passed through the pipe of the evaporator 21 returns to the compressor 23.

  As a result, the air that has flowed into the ventilation duct 9 from the outer tub 2 is cooled by the evaporator 21 and dehumidified, and then heated by the condenser 22 and warmed. Then, the warm air is supplied into the outer tank 2 through the air supply duct 17 and further supplied into the rotary tank 3.

  The hot air supplied into the rotating tub 3 takes away moisture from the clothes in the rotating tub 3 and then flows into the ventilation duct 9 from the outer tub 2 through the intake duct 11. Thus, the air in the rotating tub 3 circulates between the ventilation duct 9 having the evaporator 21 and the condenser 22 and the rotating tub 3, whereby the clothes in the rotating tub 3 are dried. Accordingly, at this time, the outer tub 2 and the rotating tub 3 function as a drying chamber.

  FIG. 6 shows a change in the temperature of the condenser 22 (detected by the temperature sensor 28) when a drying operation (driving fan 15 and driving of the compressor 23 of the heat pump 25) is performed in the drying process. Change in temperature on the inlet side of the outer tub 2 (detected by the temperature sensor 31), change in temperature on the outlet side of the outer tub 2 (detected by the temperature sensor 32), change in temperature on the inlet side of the evaporator 21 (temperature sensor 29) ) And the change in temperature on the outlet side of the evaporator 21 (detected by the temperature sensor 30).

  As apparent from FIG. 6, when the drying operation is started, the circulating air is gradually heated as the temperature of the condenser 22 rises, so that the temperature on the inlet side of the outer tub 2 and the outer tub are increased. Both the temperatures on the outlet side of 2 rise. In addition, the temperature on the inlet side of the evaporator 21 and the temperature on the outlet side of the evaporator 21 are temporarily lowered due to the cooling ability of the evaporator 21 at a stage where the temperature of the circulating air is low. It rises with increasing temperature.

  At this time, the inner diameter and length of the capillary tube 24 are set so that the temperature on the inlet side of the evaporator 21 and the temperature on the outlet side of the evaporator 21 change at substantially the same temperature. However, as described above, if metal powder generated in the tube manufacturing process or impurities generated due to aging of the tube stay in the capillary tube 24, the flow of the refrigerant is inhibited. As it progresses and the capillary tube 24 becomes clogged, the flow rate of the refrigerant decreases and the amount of refrigerant evaporated in the evaporator 21 decreases, so that the temperature on the inlet side of the evaporator 21 and the temperature on the outlet side of the evaporator 21 decrease. The difference with temperature will increase.

  That is, when the flow rate of the refrigerant decreases, the amount of refrigerant evaporated in the evaporator 21 decreases, so that the temperature on the outlet side of the evaporator 21 gradually becomes higher than the temperature on the inlet side as shown in FIG. The temperature rise of the condenser 22 is accelerated. Further, in that case, the dehumidification in the evaporator 21 is insufficient, so that the rise in the temperature on the inlet side and the temperature on the outlet side of the outer tub 2 is delayed, and as a result, drying in the washing dryer (clothing dryer) is performed. Performance decreases.

  Therefore, in this drying process, the control device 37 detects the temperature on the inlet side of the evaporator 21 with the temperature sensor 29, detects the temperature on the outlet side of the evaporator 21 with the temperature sensor 30, and detects the detected temperature. The difference (exit side temperature−inlet side temperature) Te is compared with a preset threshold value (set temperature difference). As a result, when the detected temperature difference Te is larger than the threshold value and this state is constant, it is determined that the refrigerant flow rate is abnormal (capillary tube 24 clogged), and the control content of the drying operation is corrected.

FIG. 1 shows the contents of correction control of the drying operation, and the rotational speed of the circulation fan 15 is corrected according to the detected temperature difference Te. In this case, the rotational speed of the compressor 23 is corrected according to the detected temperature difference Te, and further, the drying operation time is corrected according to the detected temperature difference Te.
In this case, a plurality of threshold values are provided, and the correction is performed in a plurality of stages according to each detected temperature difference Te based on the difference between each threshold value and the detected temperature difference Te. For example, if the detected temperature difference Te is “8”, the rotational speed of the circulation fan 15 is reduced by “5 [Hz]” at the drive power supply frequency, and the rotational speed of the compressor 23 is reduced by “200 [rpm]”. The drying operation time is increased by “10 minutes”.

If the detected temperature difference Te is “12”, the rotational speed of the circulation fan 15 is reduced by “10 [Hz]” at the drive power supply frequency, and the rotational speed of the compressor 23 is reduced by “400 [rpm]”. The drying operation time is increased by “20 minutes”.
Further, if the detected temperature difference Te is “16”, the rotational speed of the circulation fan 15 is reduced by “15 [Hz]” at the drive power supply frequency, and the rotational speed of the compressor 23 is reduced by “600 [rpm]”. The drying operation time is increased by “30 [min]”.

By doing in this way, both the rotation speed of the circulation fan 15 and the rotation speed of the compressor 23 can be set to appropriate rotation speeds according to the decrease in the refrigerant flow rate. The correction accuracy of the rotational speed of the blower 15 and the rotational speed of the compressor 23 can be improved, and insufficient drying can be compensated.
Further, in this case, the correction accuracy can be further improved by having a plurality of threshold values and performing the correction in a plurality of stages based on the difference between each threshold value and the detected temperature difference Te.

  Although not shown, if the detected temperature difference Te continues to be larger than a predetermined value, it is determined that the correction cannot be made, and an abnormality notification is performed such as displaying a predetermined error on the operation panel. Therefore, it is possible to prompt the user to notify the user of the abnormality and to request repair.

  In addition, although not shown, detection of the temperature on the inlet side and the temperature on the outlet side of the evaporator 21 is performed when a predetermined time of, for example, 30 minutes has passed since the operation of the heat pump is stabilized after the start of the drying operation. As a result, the temperature can be detected with high accuracy, and the accuracy of the correction of the control content of the drying operation can be further increased accordingly.

  In addition, in the manufacturing process of the washing and drying machine, the difference between the temperature on the inlet side and the temperature on the outlet side of the evaporator 21 is displayed on the operation panel by an operation method under a predetermined condition. When it is determined that the value is equal to or greater than the threshold value, an abnormality is notified, so that it is possible to know whether there is an abnormality such as occurrence of a defect in the manufacturing process, especially clogging of the capillary tube 24 due to, for example, poor welding. be able to.

  As mentioned above, although one embodiment was described, it is not restricted to it, and especially as a whole clothes dryer, it is not restricted to a drum type, and it applies similarly to a vertical washing machine which has a water tub and a rotation tub in the shape of a vertical axis. It does not have to have a washing and dehydrating function.

  In addition, the embodiments of the present invention are presented as examples, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 2 is an outer tub (drying chamber), 3 is a rotating tub (drying chamber), 15 is a circulation fan, 19 is a ventilation path, 20 is an air circulation device, 21 is an evaporator, 22 is a condenser, and 23 is Compressor, 24 is a capillary tube, 25 is a heat pump, 29 is a temperature sensor (first temperature detection means), 30 is a temperature sensor (second temperature detection means), and 37 is a control device (control means).

Claims (5)

A drying chamber;
An air circulation device that circulates the air in the drying chamber back to the drying chamber through a ventilation path provided outside the drying chamber by operation of the circulation fan;
By arranging an evaporator and a condenser in the ventilation path of this air circulation device and connecting them with a compressor and a capillary tube, the refrigerant is circulated through the compressor, the condenser, the capillary tube and the evaporator. Comprising a heat pump constituting a refrigeration cycle
In what dry clothes by operation of the air circulation device and the heat pump,
First temperature detecting means for detecting the temperature of the refrigerant on the evaporator inlet side;
And a second temperature detecting means for detecting the temperature of the refrigerant on the evaporator outlet side,
A garment comprising control means for correcting the rotational speed of the circulation fan based on the difference between the detected temperature of the first and second temperature detecting means and a preset threshold value Dryer. A drying chamber;
An air circulation device that circulates the air in the drying chamber back to the drying chamber through a ventilation path provided outside the drying chamber by operation of the circulation fan;
By arranging an evaporator and a condenser in the ventilation path of this air circulation device and connecting them with a compressor and a capillary tube, the refrigerant is circulated through the compressor, the condenser, the capillary tube and the evaporator. Comprising a heat pump constituting a refrigeration cycle
In what dry clothes by operation of the air circulation device and the heat pump,
First temperature detecting means for detecting the temperature of the refrigerant on the evaporator inlet side;
And a second temperature detecting means for detecting the temperature of the refrigerant on the evaporator outlet side,
Clothes drying characterized by comprising control means for correcting the rotational speed of the compressor based on the difference between the detected temperature of the first and second temperature detecting means and a preset threshold value Machine. A drying chamber;
An air circulation device that circulates the air in the drying chamber back to the drying chamber through a ventilation path provided outside the drying chamber by operation of the circulation fan;
By arranging an evaporator and a condenser in the ventilation path of this air circulation device and connecting them with a compressor and a capillary tube, the refrigerant is circulated through the compressor, the condenser, the capillary tube and the evaporator. Comprising a heat pump constituting a refrigeration cycle
In what dry clothes by operation of the air circulation device and the heat pump,
First temperature detecting means for detecting the temperature of the refrigerant on the evaporator inlet side;
And a second temperature detecting means for detecting the temperature of the refrigerant on the evaporator outlet side,
A clothes dryer comprising a control means for correcting the drying operation time based on a difference between detected temperatures of the first and second temperature detecting means and a preset threshold value. .   The control means has a plurality of the threshold values, and performs the correction in a plurality of stages based on a difference between each threshold value and a difference between detected temperatures of the first and second temperature detecting means. The clothes dryer according to any one of claims 1 to 3, wherein the clothes dryer is provided.   5. The apparatus according to claim 1, wherein when the difference between the detected temperatures of the first and second temperature detecting means continues to be greater than a predetermined value, the control means performs abnormality notification. The clothes dryer according to one item.

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