JP2013081638A - Clothes dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an energy-saving property by reducing a variation of a rotation frequency of a compressor and to achieve low noise during operation.SOLUTION: The clothes dryer includes: a heat pump device 5; a rotary drum 1 for accommodating and drying clothes; a motor 3 for driving the rotary drum; a blower fan 11 for supplying warm air heated by the heat pump device to the rotary drum; a circulation air passage 14 for leading drying air to the rotary drum after blowing the drying air sent by the blower fan from a heat absorber 9 to a radiator 7; rotation frequency detection means 18 for detecting a rotation frequency of a compressor 6; coolant temperature detection means 17 for detecting a temperature of a coolant circulating in the radiator; and control means 19 for controlling the compressor and the like and controlling a drying operation. The control means restricts the upper limit of a rotation frequency of the compressor so that the temperature of the coolant does not reach the standard temperature at the time of constant rate driving and controls the compressor so that the rotation frequency becomes stable.

Description

  The present invention relates to a clothes dryer for drying clothes and the like.

  Conventionally, this kind of clothes dryer is considered using the heat pump device (for example, refer to patent documents 1). In addition, it is considered that the rotation speed of the compressor is controlled by the compression capacity variable means (see, for example, Patent Document 2). FIG. 12 shows a configuration of a conventional clothes drying apparatus described in Patent Document 2. As shown in FIG.

  In FIG. 12, a rotating tub 51 used as a drying cabinet is rotatably provided in the main body and is driven to rotate by a motor. The circulation duct 52 is an air path that guides the drying air to circulate to the rotary tank 51. The blower 53 blows air so that the drying air circulates through the rotary tank 51 and the circulation duct 52 and is driven by a motor.

  The heat absorber 54 evaporates the refrigerant and cools and dehumidifies the drying air. The radiator 55 condenses the refrigerant and heats the drying air. 56 is a compressor that compresses the refrigerant. 57 is a pressure reducing refrigerant. A throttle means 58 such as a capillary tube for maintaining the pressure difference of the refrigerant, 58 is a pipe through which the refrigerant passes, and a pipe 58 is provided so that the refrigerant circulates through the compressor 56, the radiator 55, the throttle means 57, and the heat absorber 54. To form a heat pump device.

  Next, the operation will be described. First, when the clothes to be dried are placed in the rotating tub 51 and the motor is rotated, the rotating tub 51 and the blower 53 rotate to generate a flow of drying air (arrow A). The drying air is blown into the rotary tub 51 by the blower 53, takes moisture from the clothes b and becomes humid, and then is carried to the heat absorber 54 of the heat pump device through the circulation duct 52.

  The drying air deprived of heat by the low-temperature refrigerant in the heat absorber 54 is dehumidified and then transported to the radiator 55, and the amount of heat absorbed by the heat absorber 54 is added to the amount of heat from the compressor 56 to increase the temperature. It is heated by the heat released from the refrigerant and is circulated again into the rotating tank 51. By repeating the above, the drying of the clothes i progresses.

  By using the heat pump device, sensible heat and latent heat can be recovered from the drying air after hitting the clothes by the heat absorber 54 and used for the amount of heat for heating the drying air again in the radiator 55. The same amount of clothing can be dried in the same time with less input than heating by the heater.

  Furthermore, the amount of heat that can be output by the electric heater is limited due to the current capacity of the household outlet, but if a heat pump device is used, more output can be obtained with less input, so drying with a larger amount of heating is possible. Thus, the time can be shortened.

  For the purpose of reducing wrinkles of clothing, the compression capacity is set so that the temperature of the air blown into the rotating tub 51 becomes 70 ° C. or less according to the output of the temperature detecting means 59 provided in the circulation duct 52. The variable means 60 controls the rotational speed of the compressor 56. The compressor 56 operates at the maximum capacity at the start of the drying process, but the capacity decreases as the temperature of the air blown into the rotary tank 51 increases, so that the rotation speed of the compressor does not exceed 70 ° C. Is to increase or decrease.

JP 7-178289 A JP 2004-358028 A

  However, in the conventional configuration, since the rotation speed of the compressor is controlled by the compression capacity variable means so that the drying air is below a predetermined temperature, the rotation speed is frequently increased or decreased in order to keep the temperature constant. As a result, there is a problem in that power loss occurs due to increase / decrease in the number of rotations, and the number of rotations of the compressor that coincides with the resonance point of the piping of the heat pump device passes many times, resulting in increased noise.

  The present invention solves the above-mentioned conventional problems, reduces energy fluctuation by reducing fluctuations in the rotational speed of the compressor, and suppresses noise by minimizing the rotational speed that matches the resonance point of the pipe. An object of the present invention is to provide a clothes dryer that can be used.

  In order to solve the above-described conventional problems, a clothes dryer of the present invention includes a heat pump device, a rotating drum for storing and drying clothes, a motor for rotating the rotating drum, and the heat pump in the rotating drum. A blower fan for supplying hot air heated by the apparatus, a circulation air passage for guiding the drying air blown by the blower fan from the heat absorber to the radiator and then leading to the rotating drum, and rotation of the compressor A rotation number detection means for detecting the number, a refrigerant temperature detection means for detecting the temperature of the refrigerant flowing in the radiator, and a control means for controlling the compressor and the like to control the drying operation, the control means, The upper limit value of the rotation speed of the compressor is limited and controlled so that the temperature of the refrigerant does not reach the standard temperature during constant rate drying.

  As a result, power loss due to increase / decrease in the number of rotations of the compressor can be suppressed and energy saving can be improved, and noise can be suppressed by reducing the rotation time at the number of rotations that matches the resonance point of the pipe. be able to.

  The clothes dryer of the present invention can reduce energy fluctuations by reducing fluctuations in the rotational speed of the compressor, and can reduce noise during operation.

1 is a longitudinal sectional view of a clothes dryer according to Embodiment 1 of the present invention. System diagram of the clothes dryer Block diagram of the clothes dryer The figure which shows the change of the temperature of the refrigerant of a heat pump device, and the number of rotations of a compressor at the time of operating the clothes dryer The figure which shows the change of the temperature of the refrigerant | coolant of a heat pump apparatus and the rotation speed of a compressor when driving the clothes dryer of Embodiment 2 of this invention. The figure which shows the change of the temperature of the refrigerant | coolant of a heat pump apparatus and the rotation speed of a compressor when driving the clothes dryer of Embodiment 3 of this invention. System conceptual diagram of a clothes dryer according to a fourth embodiment of the present invention. Block diagram of the clothes dryer The figure which shows the change of the temperature of the refrigerant of a heat pump device, and the number of rotations of a compressor at the time of operating the clothes dryer System conceptual diagram of clothes dryer of Embodiment 5 of the present invention The figure which shows the change of the temperature of the drying air when driving the clothes dryer, the temperature of the refrigerant | coolant of a heat pump apparatus, and the rotation speed of a compressor System diagram of conventional clothes dryer system

  The first invention includes a compressor, a radiator that dissipates heat of the compressed refrigerant, a throttle means for reducing the pressure of the high-pressure refrigerant, and a heat absorber that takes the heat from the surroundings when the reduced-pressure and low-pressure refrigerant A heat pump device connected by a pipe line so that the refrigerant circulates, a rotating drum for storing and drying clothes and the like, a motor for rotationally driving the rotating drum, and the heat pump device being heated by the heat pump device A blower fan for supplying warm air, a circulation air passage for guiding the drying air blown by the blower fan from the heat absorber to the radiator and then leading to the rotating drum, and the rotational speed of the compressor A rotational speed detection means for detecting; a refrigerant temperature detection means for detecting a temperature of the refrigerant flowing through the radiator; and a control means for controlling the compressor and the like to control a drying operation. When dry By controlling the upper limit of the compressor speed so that the refrigerant temperature does not reach the standard temperature, the power loss due to the increase or decrease of the compressor speed is suppressed and energy saving is improved. In addition, it is possible to reduce noise by reducing the time during which the pipe rotates at a rotational speed that coincides with the resonance point of the pipe.

  In the second aspect of the invention, in particular, the control means of the first aspect of the invention sets the rotational speed of the compressor to a rotational speed higher than the rotational speed of the compressor at the time of constant rate drying at the start of the drying operation. Further, by reducing the upper limit value of the rotation speed of the compressor to the rotation speed during constant rate drying, energy savings can be improved, noise can be reduced, and drying time can also be shortened.

  In the third aspect of the invention, in particular, the control means of the first or second aspect of the invention sets the rotational speed of the compressor at the start of the drying operation to be higher than the rotational speed of the compressor at the constant rate drying. By reducing the upper limit value of the rotational speed of the compressor to the rotational speed at the constant rate drying step by step before the rate drying, energy saving can be improved and the noise can be reduced.

  In the fourth invention, in particular, the control means according to any one of the first to third inventions limits the upper limit value of the rotation speed of the compressor so that the temperature of the refrigerant does not reach the standard temperature, and the rate reduction drying. Sometimes, the compressor is controlled so as to stabilize the rotational speed, so that energy saving can be improved and noise can be reduced.

  In the fifth aspect of the invention, in particular, the control means of any one of the first to fourth aspects of the invention is configured to maintain the standard temperature by reducing the rotational speed of the compressor when the temperature of the refrigerant exceeds the standard temperature. As a result, energy savings can be improved and noise can be reduced.

  In a sixth aspect of the invention, in particular, in any one of the first to fifth aspects of the present invention, a dryness detection means for detecting the dryness of the clothes in the rotating drum is provided, and the control means is detected by the dryness detection means. By setting the number of rotations of the compressor at the start of the drying operation according to the dryness of the clothing, it is possible to perform the optimal drying operation according to the wetness of the clothing and improve energy saving Can be reduced in noise.

  According to a seventh aspect of the invention, in particular, in any one of the first to sixth aspects of the invention, a cloth amount detecting means for detecting the amount of clothing in the rotating drum is provided, and the control means is detected by the cloth amount detecting means. By setting the number of rotations of the compressor at the start of the drying operation according to the amount of clothing, it is possible to perform the optimal drying operation according to the amount of clothing, improve energy savings, and reduce noise Can be

  In an eighth aspect of the invention, in particular, in any one of the first to seventh aspects of the invention, there is provided hot air temperature detecting means for detecting the temperature of the drying air supplied to the rotating drum, and the control means is configured to control the hot air temperature. By controlling the rotation speed of the compressor based on the temperature of the hot air detected by the detecting means, energy saving performance can be improved and noise can be reduced.

  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.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a clothes dryer according to a first embodiment of the present invention, FIG. 2 is a system conceptual diagram of the clothes dryer, FIG. 3 is a block diagram of the clothes dryer, and FIG. It is a figure which shows the change of the temperature of the refrigerant | coolant of a heat pump apparatus and the rotation speed of a compressor when driving the clothes dryer.

  In FIG. 1 to FIG. 4, a rotary drum 1 that accommodates and dries clothes A is rotatably provided in a body 2 of a clothes dryer, and is rotated by a motor 3 via a drum belt 4. The heat pump device 5 includes a compressor 6 that compresses the refrigerant, a radiator 7 that radiates the heat of the compressed high-temperature and high-pressure refrigerant, and a capillary that reduces the pressure of the high-pressure refrigerant and maintains the pressure difference of the refrigerant. It comprises a throttle means 8 such as a tube, a heat absorber 9 from which the refrigerant whose pressure has been reduced to a low pressure takes heat from the surroundings, and a pipe line 10 connecting them so that the refrigerant circulates.

  The drying air is blown from the rear of the rotating drum 1 toward the clothing a by rotating the blower fan 11 by the motor 3. In the drying air that has evaporated moisture from the clothing a and contains a lot of moisture, the lint and dust generated from the clothing a is collected by the filter 13 attached to the inside of the door 12 and passes through the circulation air passage 14. Then, it is led to the heat absorber 9 and the heat radiator 7 of the heat pump device 5. The heat absorber 9 cools and dehumidifies the drying air, the radiator 7 reheats the drying air, and is sent to the rotary drum 1 by the blower fan 11.

  The main body 2 and the rotating drum 1 seal the front and rear of the rotating drum 1 with a sealing member 15 such as felt so that drying air does not leak. The dehumidified water generated when the drying air is cooled and dehumidified by the heat absorber 9 is discharged to a dehumidification tank (not shown) by a drain pump (not shown).

  The dryness detection means 16 is provided in the front part of the drying chamber formed in the rotary drum 1 and detects the dryness of the clothes i from the resistance value of the electrode that contacts the clothes agitated in the rotary drum 1. To do. The refrigerant temperature detection means 17 is provided in the pipe line 10 of the radiator 7 and detects the temperature of the refrigerant flowing through the radiator 7.

  The control means 19 provided with the rotation speed detection means 18 for detecting the rotation speed of the compressor 6 is based on information such as the dryness detection means 16 and the refrigerant temperature detection means 17, and the motor 3, the compressor 6, and the blower fan. 11 etc. are controlled and the drying operation which dries drying objects, such as clothing a, is performed. The arrow B indicates the flow of drying air.

  About the clothes dryer comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. First, the clothes to be dried are put into the rotating drum 1 by opening and closing the door 12. Next, when the drying operation is started, the motor 3 rotates, the rotating drum 1 and the blower fan 11 rotate, and a flow of drying air (arrow B) is generated. The drying air takes moisture from the clothes i in the rotary drum 1 and becomes humid, passes through the filter 13, passes through the circulation air passage 14, and is guided to the heat absorber 9 of the heat pump device 5. The rotary drum 1 is rotationally driven by the motor 3 via the drum belt 4, and the clothes are stirred up and down in the rotary drum 1.

  When the compressor 6 of the heat pump device 5 is actuated, the refrigerant is compressed and circulates through the radiator 7, the throttle means 8, and the heat absorber 9 by this pressure. In the radiator 7, the heat of the refrigerant is released in a high pressure state, and in the heat absorber 9, the pressure is reduced by the expansion means 8 to be in a low pressure state, and the heat is absorbed by the refrigerant. At this time, the blower 11 is activated, and the drying air flowing through the circulation air passage 14 is heated by the heat radiation of the radiator 7.

  The hot air blown into the rotary drum 1 takes moisture when passing between the clothes and becomes humid, and then the filter 13 removes foreign matters such as lint, and the heat pump passes through the circulation air passage 14. It is led to the heat absorber 9 of the device 5. When the humid drying air passes through the heat absorber 9, sensible heat and latent heat are taken away and dehumidified, and separated into dry air and dehumidified water.

  This dry air is heated again by the radiator 7 and becomes warm air and is blown into the rotary drum 1 again by the blower fan 11. On the other hand, the dehumidified water condensed by the heat absorber 9 is discharged to a dehumidification tank (not shown) by a drain pump (not shown).

  As shown in FIG. 4, the control means 19 controls the rotational speed of the compressor 6 according to the output of the refrigerant temperature detection means 17 so that the refrigerant temperature does not reach the standard temperature t. The upper limit value of the rotational speed is limited step by step from r1 to r2.

  In the initial stage of drying, the upper limit is set to r1 and the compressor 6 is driven. However, when the refrigerant temperature rises, the upper limit rotational speed is lowered step by step, and the refrigerant temperature becomes the standard temperature t. The rotational speed r2 is decreased to a stable rotational speed r2 in a state where it does not reach. Thereby, since the temperature of the refrigerant has not reached the standard temperature t, the rotational speed of the compressor 6 becomes stable at r2.

  In this way, by limiting the upper limit value of the rotational speed of the compressor 6 by reducing it stepwise so that the temperature of the refrigerant does not reach the standard temperature t, the compressor 6 can be used during constant rate drying in the drying process. The rotation speed of the compressor 6 can be made stable, and the power loss associated with the increase or decrease of the rotation speed of the compressor 6 can be suppressed to reduce the power consumption. In addition, the number of rotations that coincides with the resonance point of the pipe line 10 of the heat pump device 5 as the number of rotations increases or decreases can be minimized, and noise reduction during the drying operation can be realized.

  Further, since the upper limit rotational speed r1 of the compressor 6 at the initial stage of drying (preheating drying area) is set higher than the rotational speed r2 at the time of constant rate drying, the temperature of the refrigerant rises more than when the drying is performed at r2 from the initial stage of drying. Can be shortened and drying time can be shortened.

  In this way, by setting the upper limit number of rotations of the compressor 6 at the initial stage of drying to a number of rotations r1 higher than the number of rotations r2 during constant rate drying, drying operation can be shortened and energy saving can be improved. Can be reduced in noise.

  Further, in the latter half of the drying process, it becomes a reduced rate drying area in which the amount of water evaporated from the clothes is reduced. At the time of this reduced rate drying, since the amount of moisture contained in the drying air is small, when the rotation speed of the compressor 6 is the same, the temperature is the same or slightly lower than the temperature of the refrigerant at the constant rate drying. For this reason, by maintaining the upper limit rotation speed of the compressor 6 at r2, the temperature of the refrigerant becomes stable without reaching the standard temperature t.

  The upper limit value of the rotation speed of the compressor 6 may be set slightly higher than r2 so that the refrigerant temperature does not reach the standard temperature t.

  As described above, the upper limit value of the rotational speed of the compressor 6 is limited so that the refrigerant temperature does not reach the standard temperature t, so that the rotational speed of the compressor 6 is stabilized even during the rate-decreasing drying. As a result, it is possible to improve energy saving and reduce noise during the drying operation.

(Embodiment 2)
FIG. 5 is a diagram showing changes in the refrigerant temperature and the rotation speed of the compressor of the heat pump apparatus when the clothes dryer according to the second embodiment of the present invention is operated. The feature of this embodiment is that when the temperature of the refrigerant exceeds the standard temperature, the rotational speed of the compressor 6 is lowered to maintain the standard temperature. Other configurations are the same as those of the first embodiment, the same reference numerals are given to the same configurations, and the detailed description of the first embodiment is used.

  The drying air is dehumidified and heated by the heat pump device 5 and blown into the rotary drum 1 by the blower fan 11. Then, it exchanges heat with the clothing A, passes through the filter 13 and is guided to the heat pump device 5 again. At this time, foreign matters such as lint generated from the clothing A are collected by the filter 13.

  The filter 13 is preferably cleaned every time it is used. However, when the user forgets to clean the filter 13, if the filter 13 has a lot of lint or the like generated from the clothing A, the airway pressure loss increases and the air volume increases. May decrease. At this time, even if the upper limit number of rotations of the compressor 6 is set to r2, the refrigerant temperature may reach the standard temperature t. When the temperature of the refrigerant reaches the standard temperature t, the rotational speed of the compressor 6 is increased or decreased so as to maintain the standard temperature t by decreasing the rotational speed of the compressor 6. Since the upper limit rotational speed of the compressor 6 is set to r2, the increase / decrease range of the rotational speed can be suppressed as compared with the case where r2 is not set.

  As described above, when the temperature of the refrigerant exceeds the standard temperature t, the rotation speed of the compressor 6 is decreased and the standard temperature t is maintained, so that energy saving can be improved.

(Embodiment 3)
FIG. 6 is a diagram showing changes in the refrigerant temperature and the rotation speed of the compressor of the heat pump device when the clothes dryer according to the third embodiment of the present invention is operated. A feature of the present embodiment is that a dryness detecting means 16 for detecting the dryness of the clothes i in the rotary drum 1 is provided, and the control means 19 corresponds to the dryness of the clothes i detected by the dryness detecting means 16. That is, the rotational speed of the compressor 6 at the start of the drying operation is set. Other configurations are the same as those of the first embodiment, the same reference numerals are given to the same configurations, and the detailed description of the first embodiment is used.

  The dryness detection means 16 is provided in the front part of the drying chamber formed in the rotating drum 1, and is disposed at a position in contact with the clothes agitated in the rotating drum 1. The dryness detection means 16 is composed of an electrode sensor, and detects the dryness of the clothes i based on the resistance value of the clothes i in contact.

  Open the door 12 and put the clothes to be dried into the rotating drum 1. Next, when the drying operation is started, the motor 3 is rotated, the rotating drum 1 is rotated, and the clothes are stirred. At this time, the clothes A come into contact with the dryness detection means 16. The control means 19 drives the compressor 6 by setting the upper limit rotation speed of the compressor 6 at the start of the drying operation according to the output of the dryness detection means 16.

  That is, the upper limit number of revolutions is set to r1 when the amount of wetness of the clothing A is large, and the compressor 6 is driven with the upper limit number of revolutions set to r3 when the degree of wetness is small. Since the drying time is shortened when the amount of wetness of the clothes i is small, the energy saving performance can be further improved and the noise can be reduced by setting the compressor 6 at a high rotational speed and drying.

(Embodiment 4)
FIG. 7 is a system conceptual diagram of a clothes dryer according to a fourth embodiment of the present invention, FIG. 8 is a block diagram of the clothes dryer, and FIG. 9 is a diagram of a heat pump apparatus when the clothes dryer is operated. It is a figure which shows the change of the temperature of a refrigerant | coolant, and the rotation speed of a compressor. A feature of the present embodiment is that cloth amount detecting means 20 for detecting the amount of clothes in the rotary drum 1 is provided, and the control means 19 performs a drying operation according to the amount of clothes detected by the cloth amount detecting means 20. That is, the rotation speed of the compressor 6 at the start is set. Other configurations are the same as those of the first embodiment, the same reference numerals are given to the same configurations, and the detailed description of the first embodiment is used.

  The cloth amount detection means 20 is provided on the front surface of the drying chamber formed in the rotary drum 1 and is disposed at a position in contact with the clothes agitated in the rotary drum 1. The cloth amount detection means 20 comes into contact with the clothes when the clothes are being stirred in the rotary drum 1 by the rotation of the motor 3. The amount of clothing a in the rotary drum 1 is detected based on the number of times that the clothing a contacts the fabric amount detection means 20. When the amount of clothes i is small, the number of times per unit time that contacts the cloth amount detection means 20 is small, and when the amount of clothes i is large, the number of times is large.

  The amount of clothes A is determined by the cloth amount detection means 20, the upper limit number of rotations of the compressor 6 at the start of the drying operation is set, and the compressor 6 is driven. That is, when the amount of clothes i is large, the upper limit rotational speed is set high (r1), and when the amount of clothes i is small, the upper limit rotational speed is set low (r4) and the compressor 6 is driven. When the amount of clothes is small, the drying time is shortened. Therefore, energy saving can be further improved and noise can be reduced by setting the number of revolutions of the compressor 6 to be high and drying.

(Embodiment 5)
FIG. 10 is a system conceptual diagram of a clothes dryer according to the fifth embodiment of the present invention, and FIG. 11 is a temperature of drying air when the clothes dryer is operated, a temperature of refrigerant of a heat pump device, and a compressor. It is a figure which shows the change of the rotation speed. The present embodiment is characterized in that a hot air temperature detecting means 21 for detecting the temperature of the drying air supplied to the rotary drum 1 is provided, and the control means 19 is based on the temperature of the hot air detected by the hot air temperature detecting means 21. That is, the rotational speed of the compressor 6 is controlled. Other configurations are the same as those of the first embodiment, the same reference numerals are given to the same configurations, and the detailed description of the first embodiment is used.

  As shown in FIG. 10, a hot air temperature detecting means 21 for detecting the temperature of the drying air flowing through the circulation air passage 14 is provided on the downstream side of the radiator 7 and between the rotating drum 1. The control means 19 controls the rotation of the compressor 6 based on information from the hot air temperature detection means 21. Further, as shown in FIG. 11, there is a correlation between the temperature of the drying air and the temperature of the refrigerant, and by detecting the temperature of the drying air by the hot air temperature detecting means 21, as in the first embodiment, The upper limit value of the rotation speed of the compressor 6 can be limited from r1 to r2 step by step so that the temperature of the refrigerant does not reach the standard temperature t.

  In the initial stage of drying, the upper limit is set to r1 and the compressor 6 is driven. However, when the refrigerant temperature rises, the upper limit rotational speed is lowered step by step, and the refrigerant temperature becomes the standard temperature t. The rotational speed r2 is decreased to a stable rotational speed r2 in a state where it does not reach. Thereby, since the temperature of the refrigerant has not reached the standard temperature t, the rotational speed of the compressor 6 becomes stable at r2.

  In this way, by limiting the upper limit value of the rotation speed of the compressor 6 by reducing it stepwise so that the refrigerant temperature does not reach the standard temperature t, the rotation of the compressor 6 during constant rate drying in the drying process. The number can be made stable, the power loss accompanying the increase or decrease of the rotation speed of the compressor 6 can be suppressed, and the power consumption can be reduced. Further, the number of rotations that coincides with the resonance point of the pipe line 10 of the heat pump device 5 due to the increase / decrease in the number of rotations can be minimized, and noise can be reduced.

  As described above, the clothes dryer according to the present invention is useful as a clothes dryer because it can reduce the fluctuation in the rotation speed of the compressor to improve energy saving and reduce noise during operation. is there.

DESCRIPTION OF SYMBOLS 1 Rotating drum 3 Motor 5 Heat pump apparatus 6 Compressor 7 Radiator 8 Throttle means 9 Heat absorber 10 Pipe line 11 Blower fan 14 Circulating air path 17 Refrigerant temperature detection means 18 Rotation speed detection means 19 Control means

Claims (8)

The refrigerant circulates between the compressor and the radiator that radiates the heat of the compressed refrigerant, the throttle means for reducing the pressure of the high-pressure refrigerant, and the heat absorber that takes the heat from the surroundings when the reduced-pressure refrigerant becomes low-pressure. A heat pump device connected by a pipe line, a rotating drum for storing and drying clothes, a motor for rotationally driving the rotating drum, and a blower for supplying hot air heated by the heat pump device into the rotating drum A fan, a circulation air passage for leading the drying air blown by the blower fan from the heat absorber to the radiator and then leading to the rotating drum, and a rotation speed detecting means for detecting the rotation speed of the compressor And a refrigerant temperature detecting means for detecting the temperature of the refrigerant flowing through the radiator, and a control means for controlling the compressor and the like to control the drying operation, wherein the control means has a temperature of the refrigerant during constant rate drying. Clothes dryer to control by limiting the upper limit rotational speed of said compressor so as not to reach the reference temperature. The control means sets the rotation speed of the compressor at the start of the drying operation to a rotation speed higher than the rotation speed of the compressor at the constant rate drying, and sets the upper limit value of the compressor rotation rate to the constant rate before the constant rate drying. 2. The clothes dryer according to claim 1, wherein the number of rotations is lowered to the time of drying. The control means sets the rotation speed of the compressor at the start of the drying operation to a rotation speed higher than the rotation speed of the compressor at the constant rate drying, and sets the upper limit value of the compressor rotation rate to the constant rate before the constant rate drying. The clothes dryer according to claim 1 or 2, wherein the rotational speed is lowered step by step until the rotational speed during drying. The control means limits the upper limit value of the rotation speed of the compressor so that the refrigerant temperature does not reach the standard temperature, and controls so that the rotation speed of the compressor becomes stable during the reduction rate drying. The clothes dryer of any one of -3. The clothes dryer according to any one of claims 1 to 4, wherein when the temperature of the refrigerant exceeds the standard temperature, the control means reduces the rotation speed of the compressor to maintain the standard temperature. A dryness detecting means for detecting the dryness of the clothes in the rotating drum is provided, and the control means sets the number of rotations of the compressor at the start of the drying operation according to the dryness of the clothes detected by the dryness detecting means. The clothes dryer according to any one of claims 1 to 5. A cloth amount detecting means for detecting the amount of clothes in the rotating drum is provided, and the control means sets the number of rotations of the compressor at the start of the drying operation according to the amount of clothes detected by the cloth amount detecting means. The clothes dryer according to any one of claims 1 to 6. A hot air temperature detecting means for detecting the temperature of the drying air supplied to the rotating drum is provided, and the control means controls the rotational speed of the compressor based on the temperature of the hot air detected by the hot air temperature detecting means. The clothes dryer according to any one of claims 1 to 7.

Images