JP5104838B2 - Clothes drying apparatus and washing dryer equipped with the apparatus - Google Patents

Description

  The present invention relates to a clothes dryer used in a general household and a clothes dryer installed in a clothes dryer that performs only drying.

  In recent years, products equipped with a heat pump are becoming mainstream in household drum-type washing and drying machines. Compared to conventional heater heating / water-cooled dehumidification, this system has been evaluated for its superior features such as overwhelming energy saving (power consumption approximately halved), low-temperature drying that does not damage clothes, shortening drying time, and zero water consumption. Conceivable. In recent years, eco-friendly consumer promotion measures at the national level to achieve CO2 emission reductions and generalization of social issues such as natural destruction and global warming that are being recognized as familiar things Interest and awareness are increasing rapidly. Despite these changes in the times, energy savings are also advancing in drum-type washing and drying machines, but electrical appliances still have high absolute power consumption, and further reductions in power consumption are required.

  When washing / drying is performed in a drum-type washing / drying machine, the power consumption for drying occupies the majority, and during the drying, the driving of the compressor accounts for more than half. In order to achieve further energy saving, it is essential to improve this part.

  Also, a clothes drying device that includes refrigerant pressure detecting means for detecting the pressure of the refrigerant, and controls the motor efficiency not to be maximized in order to increase the amount of heat generated from the motor when the refrigerant pressure is lower than a predetermined value. Is known (see Patent Document 1).

JP 2008-183298 A

  However, drying is a task of removing a predetermined amount of moisture from clothing, and unless at least a predetermined compressor rotation speed is maintained, the dehumidifying ability is insufficient, and drying becomes significantly longer or cannot be completed. For this reason, it is not possible to easily reduce the compressor speed for energy saving purposes. Improvements in performance such as the contact efficiency between clothing and air and the increase in circulating airflow are being advanced, and there is a tradeoff with the size and cost of the product.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a clothing drying apparatus that can reduce the power consumption of a compressor driven with a high contribution without increasing the cost. .

In order to solve the above conventional problems, a clothes drying apparatus of the present invention includes a motor, a compressor driven by the motor, a radiator that radiates heat of the compressed refrigerant, and a pressure of the high-pressure refrigerant. a throttle means for reducing the pressure, a heat absorber taking heat from the surrounding by the refrigerant which becomes low pressure is depressurized, the heat pump apparatus in which the refrigerant is constituted by connecting in line to circulate a drying cabinet for accommodating the clothing A blowing means for blowing drying air, a circulation air path for guiding the drying air to the heat absorber through the radiator and the drying cabinet, and returning the heat to the heat radiator again, and a control means for controlling the operation of the motor And a timer , the heating air is heated by the radiator from the start of the drying operation, and the motor current phase is advanced at a predetermined timing until the temperature of the drying air reaches a predetermined temperature. is intended to change the

  This realizes a clothes drying apparatus that reduces the power consumption required during the drying operation without increasing the cost by controlling with the optimum current phase that matches the refrigerant pressure, that is, the load torque applied to the motor. Can do.

  The clothes drying apparatus of the present invention can reduce the compressor driving power consumption during the drying operation without increasing the cost, and can improve the energy saving performance of the clothes drying apparatus.

Side sectional view of the washing and drying machine in Embodiment 1 of the present invention Operation principle diagram of heat pump type dryer in the present invention Characteristics diagram of motor current phase and motor efficiency contained in the compressor installed in the washer / dryer

The first invention includes a motor, a compressor driven by the motor, a radiator that dissipates the heat of the compressed refrigerant, a throttle means that depressurizes the pressure of the high-pressure refrigerant, and is decompressed to a low pressure. a heat sink removing heat from the surroundings in refrigerant, and blowing means for blowing the heat pump apparatus constituted by connecting in line as the refrigerant circulates, a drying chamber for accommodating the clothing, the dry air, the A circulation air passage that guides drying air to the heat absorber via the radiator and the drying cabinet and returns the air to the radiator again, a control means for controlling the operation of the motor, and a timer, from the start of the drying operation The drying air is heated by the radiator, and the motor current phase is changed in a direction to advance at a predetermined timing until the temperature of the drying air reaches a predetermined temperature . Predetermined drying operation sequence Previously determined tables assuming an increase in the refrigerant pressure in the case of operation in advance, achieve clothes drying device with reduced power consumption without the cost by controlling the current phase of the motor in accordance with the elapsed time can do.

According to a second aspect of the present invention, the control means according to the first aspect of the invention provides a clothes drying method that can be stably operated without suddenly changing the current phase of the motor by changing the current phase of the motor stepwise. An apparatus can be realized.

In the third aspect of the invention, the control means in the first or second aspect of the invention sets the current phase according to the rotational speed of the motor, and the higher the rotational speed of the compressor, the easier the refrigerant pressure increases. By controlling the motor current phase to match this, it is possible to realize a clothes drying apparatus that reduces power consumption without increasing costs .

According to a fourth aspect of the present invention, in any one of the first to third aspects, the clogging detecting means for the lint filter disposed in the circulation air passage is provided, and the current of the motor is determined according to the clogging of the lint filter. The degree of phase change is changed. When drying is performed, fine fiber litter of clothing accumulates in the lint filter, and if the cleaning is neglected, the circulating air volume is reduced and the refrigerant pressure is more likely to rise. Therefore, by controlling the motor current phase in accordance with the degree of clogging of the lint filter, it is possible to realize a clothes drying apparatus with reduced power consumption without increasing costs.

A fifth invention is Oite in any one invention of the first to 3 comprises an ambient temperature measurement means, thereby changing the degree of change in the current phase of the motor in accordance with the ambient temperature. Depending on where the clothes drying device is installed, exposure to high or low temperatures can be considered. For example, in a low-temperature environment, the refrigerant temperature rises slowly due to the operation of the aircraft. That is, the refrigerant pressure is less likely to increase. Therefore, the motor current phase is controlled in accordance with the ambient temperature . As a result, it is possible to realize a clothes drying apparatus that reduces power consumption without increasing costs.

A sixth invention is Oite in any one invention of the first to 3 comprises a clothes weight detection means, thereby changing the degree of change in the current phase of the motor in accordance with the garment by weight. When the amount of clothes to be dried is small, for example, it becomes difficult for the heat absorber to dehumidify and absorb heat, and the rise in the refrigerant temperature becomes more gradual. Therefore, the motor current phase is controlled in accordance with the clothing weight . As a result, it is possible to realize a clothes drying apparatus that reduces power consumption without increasing costs.

A seventh invention is the first to sixth washing and drying machine provided with a clothes drying apparatus of any one of the invention, without the cost, with reduced power consumption required during the drying operation washing A dryer can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 is a side sectional view of a washing / drying machine equipped with a clothes drying apparatus according to the first embodiment of the present invention, and FIG. 2 is an operation principle diagram of a heat pump type drying machine according to the present invention. The configuration is described below with reference to FIGS.

  In the washing / drying machine main body 1 (hereinafter referred to as “main body 1”) of the washing / drying machine in the present embodiment, there is a washing tub 2 and a drum motor 3 is attached. The washing tub 2 is held by suspensions 4 on both sides and attached to the main body 1. A rotary drum 6 serving as a drying cabinet for storing the clothes 5 is directly connected to the drum motor 3 via a shaft and is rotatably mounted in the washing tub 2. At the front opening of the washing tub 2 and the rotating drum 6, a door 7 is provided for putting clothes 5. A gap between the main body 1 and the washing tub 2 is substantially sealed by a bellows 8 and a door packing 9 so that air does not leak into the main body 1 or outside the machine. A plurality of drum holes 10 through which washing water and drying air enter and exit are provided on the side wall of the rotary drum 6, and a drum opening 11 is provided on the bottom surface.

  The washing tub opening 12 is provided on the inner wall of the side surface of the washing tub 2, and the filter case 14 and the dehumidifying / drying unit 15 constituting the lint filter 13 communicate with each other through an air passage. The washing tub opening 16 is provided on the bottom surface of the washing tub 2, and the dehumidifying and drying units 15 are also communicated with each other via an air passage. A blower 17 is integrally provided at the outlet of the washing tub opening 16 connection side of the dehumidifying and drying unit 15, and blows air toward the washing tub opening 16. The blower 17 allows the air in the washing tub 2 and the rotating drum 6 to circulate in the closed space while passing through the dehumidifying and drying unit 15 through the air path.

  The dehumidifying and drying unit 15 includes a compressor 18 that compresses the vaporized refrigerant, a radiator 19 that radiates heat of the compressed high-temperature and high-pressure refrigerant, and a throttle means that includes a capillary tube for reducing the pressure of the high-pressure refrigerant. 20 and a heat absorber 21 that draws heat from the surroundings of the refrigerant that has been depressurized to a low pressure are connected in order, and are connected by a conduit 22 so that the refrigerant circulates again to the compressor 18. The compressor 18 includes an IPM motor (not shown). The laundry drainage channel 23 is a channel for draining wastewater during washing. Condensed water generated in the heat absorber 21 during drying is connected to the washing drainage channel 23 by a drain pump (not shown).

  The refrigerant temperature detecting means 24 is provided close to the pipe line 22 that is in the middle of the radiator 19 and detects the temperature of the refrigerant. The drying air temperature detection means 25 is installed in front of the washing tub opening 16 in the circulation air passage and detects the temperature of the drying air. Control means (not shown) controls the operation of the motor included in the compressor 18.

The operation and action of the washing / drying machine configured as described above will be described below.
In the washing process from washing, rinsing, and dehydration, when water is stored, the drainage valve 26 closes the washing drainage channel 23 side, water is supplied to the washing tub 2 from a water supply valve (not shown), Can be stored. The rotating drum 6 rotates continuously or intermittently at a programmed number of rotations, and cleaning and rinsing are performed. During this time, the garment 5 is lifted and dropped by the rotation of the rotating drum 6. When draining, the drainage valve 26 opens the washing drainage channel 23 side, and the water in the washing tub 2 passes through the washing drainage channel 23 and the drainage valve 26 and is drained out of the machine from the drainage pipe.

  In the drying process, the drainage valve 26 closes the washing drainage channel 23 side, and the motor 3 that drives the compressor 18, the blower 17, and the rotary drum 6 is operated. The air in the washing tub 2 and the rotating drum 6 is circulated in the closed space while passing through the dehumidifying and drying unit 15 through the air path by the operation of the air blowing means 17. The clothing 5 is agitated by a rotating drum 6 that rotates continuously or intermittently at a preset number of rotations.

  The refrigerant circulates in the pipe line 22 by the operation of the compressor 18, and the heat of the high-temperature and high-pressure refrigerant is radiated by the radiator 19 to heat the circulating drying air. The heated drying air is sent into the washing tub 2 by the blowing means 17, passes through the opening 11 provided on the bottom surface of the rotating drum 6, hits the garment 5, takes moisture from the garment 5, and is humid air. Then, it passes through a large number of holes 10 provided in the side wall of the rotating drum 6 and returns to the dehumidifying and drying unit 15 through the opening 12 of the washing tub 2. The humid air is cooled and dehumidified by a heat absorber 21 as a dehumidifying means provided in the dehumidifying / drying unit 15. The dehumidified drying air is sent to the radiator 36 and heated, and again sent into the washing tub 2 by the blowing means 17. During the drying operation, the operation of the motor is controlled by control means (not shown) so that the temperature of the drying air becomes constant at the predetermined temperature T.

  When the drying operation is started in a state in which the main body 1 is adapted to the room temperature, the dehumidifying and drying unit 15 is also at the room temperature. Therefore, the refrigerant is heated by the electric power input to the motor included in the compressor 18, and the energy is based on the energy. However, if the temperature of the refrigerant is low, the pressure of the refrigerant is low, and therefore the torque required by the motor is also reduced. Further, after the temperature of the drying air reaches the predetermined temperature T, the rotation speed of the motor is controlled so as to keep the temperature constant. For example, when rotating at a certain rotation speed R, if the temperature of the drying air becomes higher than the predetermined temperature T, the rotation speed is lowered, and conversely, the temperature of the drying air becomes lower than the predetermined temperature T. Controls to increase the rotation speed.

  The compressor 18 of the present embodiment employs an IPM motor, and the motor torque is a combined torque of the magnet torque and the reactance torque, and both are functions of the advance value. Here, the advance value of the motor current phase, which is the minimum loss, differs depending on the load torque. Therefore, by setting the optimum advance value according to the refrigerant pressure fluctuation (that is, fluctuation of the load torque) in the dry operation, the motor drive Efficiency can be increased and power consumption can be reduced.

  This relationship is shown in FIG. It can be seen that when the motor speed is constant (45 rps), the maximum efficiency advance angle increases as the load torque increases. That is, even in an actual drying operation, it is possible to always perform an operation with optimum efficiency by setting the advance angle variably in accordance with the value of the refrigerant pressure corresponding to the load torque. For example, the higher the rotation speed of the compressor, the higher the refrigerant pressure. The refrigerant pressure is more likely to increase. As the air volume, that is, the lint filter becomes clogged, the refrigerant pressure is more likely to increase. Further, for example, in a low temperature environment, an increase in the refrigerant temperature due to the operation of the airframe, that is, the refrigerant pressure is less likely to increase. Furthermore, when the amount of clothes is small, for example, it is difficult for the heat absorber to absorb heat by dehumidification, and the rise in refrigerant temperature, that is, the rise in refrigerant pressure becomes more gradual. In order to show such a tendency according to various conditions, control suitable for this is performed by the control means.

  The basic operation sequence for drying is determined in advance, and fluctuations in the refrigerant pressure during normal use can be estimated in advance, so control is not performed in response to pressure or temperature feedback. Even in control that advances the angle, a sufficient power consumption reduction effect can be expected. For example, immediately after the start of the drying operation, the advance angle is 18 degrees near the refrigerant pressure of 0.60 MPa, 50 minutes after the start of the operation, the advance angle is 20 degrees near the refrigerant pressure of 1.20 MPa, and 80 minutes after the operation starts, the refrigerant pressure is around 1.80 MPa. For example, the advance angle is 22 degrees.

  Further, when changing the current phase, if it is changed in a short time, the motor may step out and the operation of the compressor 18 may be stopped. The change in this case may be performed step by step without sudden change.

  As described above, according to the present embodiment, the control unit controls the current phase of the motor in accordance with the value of the refrigerant pressure detected by the refrigerant pressure detection unit, for example, so that the refrigerant pressure, that is, the load torque applied to the motor. By controlling at the optimum current phase suitable for the clothes, it is possible to provide a clothes drying apparatus that reduces the amount of power consumption required during the drying operation without increasing the cost.

  In this embodiment, the temperature of the drying air is detected and controlled to be constant at the predetermined temperature T. However, since the temperature of the drying air and the temperature of the refrigerant are highly correlated, Even if the temperature is detected and controlled to be constant at the second predetermined temperature T2, the same effect can be obtained. Further, since the refrigerant temperature has a high correlation with the refrigerant pressure, the refrigerant pressure detection means can be configured easily and inexpensively using the drying air temperature detection means 25 and the refrigerant temperature detection means 24.

  In the present embodiment, the washing / drying machine has been described as an example, but it goes without saying that the same effect can be obtained in a clothes drying machine that only dries clothes.

  As described above, the clothes drying apparatus according to the present invention can reduce the power consumption required during the drying operation without increasing the cost, and the washing and drying used in a general household are the same. It can be widely applied to a washing machine with a drying function performed in a tank and a clothes dryer performing only drying.

2 Laundry tub 5 Clothes 6 Rotating drum (dryer)
DESCRIPTION OF SYMBOLS 15 Dehumidification drying unit 17 Blasting means 18 Compressor 19 Radiator 20 Throttle means 21 Heat absorber 22 Pipe line 24 Refrigerant temperature detection means (refrigerant pressure detection means)
25 Air temperature detection means for drying (refrigerant pressure detection means)

Claims (7)

A motor, a compressor driven by the motor, a radiator for dissipating heat of the compressed refrigerant, a throttle means for reducing the pressure of the high-pressure refrigerant, and heat from the surroundings by the reduced-pressure refrigerant. a heat sink to take the, the heat pump apparatus constructed by connecting in line as the refrigerant circulates, a drying chamber for accommodating the clothing, and blowing means for blowing drying air, the heat radiation of the drying air A circulation air passage that leads to the heat absorber through the chiller and the drying cabinet, and returns to the radiator again, a control means for controlling the operation of the motor, and a timer. A clothes drying apparatus , wherein the air is heated and the motor current phase is changed at a predetermined timing until the temperature of the drying air reaches a predetermined temperature . The clothes drying apparatus according to claim 1, wherein the control means changes the current phase of the motor in a stepwise manner . The clothes drying apparatus according to claim 1 or 2, wherein the control means sets a current phase according to the number of rotations of the motor. The clogging detection means of the lint filter arrange | positioned in the said circulation air path is provided, The change degree of the electric current phase of the said motor is changed according to clogging of a lint filter. The clothes drying apparatus as described in. The clothing drying apparatus according to any one of claims 1 to 3 , further comprising an atmospheric temperature measuring unit, wherein the degree of change in the current phase of the motor is changed according to the atmospheric temperature . The clothing drying apparatus according to any one of claims 1 to 3 , further comprising clothing weight detection means, wherein the degree of change in the current phase of the motor is changed in accordance with the clothing weight . 請 Motomeko 1 washing and drying machine characterized by comprising a clothes drying apparatus according to any one of 6.