JP2010012073A - Clothes dryer - Google Patents

Abstract

An object of the present invention is to increase the temperature of an evaporator at the time of drying at a low outside air temperature, to prevent clogging caused by frosting of the evaporator, and to shorten the washing and drying time.
A clothes drying apparatus employs a variable air volume type as a blower 11 for circulating dry air, and when a temperature sensor 30 attached to an evaporator 21 detects a temperature equal to or lower than a predetermined value, the clothes drying apparatus is fixed for a certain period of time. (Time of (DELTA) T1) The ventilation volume of the air blower 11 is decreased, the temperature fall of the evaporator 21 is suppressed, the frost formation to the evaporator 21 is suppressed, and the temperature of the evaporator 21 at the time of low external temperature is set. This increases the drying time of the clothing 4 and the like.
[Selection] Figure 2

Description

  The present invention relates to a drying apparatus for drying clothes, bedding, etc. in a non-dry state after washing.

  In this type of conventional drying apparatus, a drying apparatus having a heat pump device as a drying means is known (see Patent Document 1).

  The configuration and operation of the conventional drying apparatus will be described with reference to FIG.

  FIG. 8 shows a drum-type clothes dryer, and a rotating drum 53 that rotates about a horizontal axis 52 as a central axis is arranged in a casing 51.

  A clothing insertion port 54 formed on the front surface of the rotating drum 53 opens to the front surface of the housing 51 and is opened and closed by a door 55.

  An air circulation path 57 including a drying chamber 56 set inside the rotary drum 53 is configured in the casing 51, and the air circulation path 57 includes a drying chamber 56, a blower chamber 58, a heat exchange chamber 59, and the like on the way. The air in the drying chamber 56 flows from the rotary drum side exhaust port 60 on the back wall to the blower chamber 58, and then passes through the heat exchange chamber 59 and again from the air supply port 61 provided in front of the drying chamber 56. It circulates in this drying chamber 56.

  The motor 62 drives the rotating drum 53 and the fan 65, and the rotation is transmitted to the rotating drum 53 and the fan 65 via belts 63 and 64.

  A fan 65 is disposed in the blower chamber 58, and an evaporator 66 is disposed on the upstream side and a condenser 67 is disposed on the downstream side inside the heat exchange chamber 59.

  The evaporator 66 and the condenser 67 constitute a heat pump together with an expansion mechanism 69 such as a compressor 68 and a capillary tube.

  The operation of the washing and drying machine configured as described above will be described below.

  First, the high-humidity air from the drying chamber 56 is cooled by the evaporator 66 and dehumidified, and then becomes dry air to the condenser 67 where it is heated to become high-temperature and low-humidity air.

The high-temperature and low-humidity air is supplied from the air supply port 61 to the drying chamber 56 and is used for drying the clothing A therein.
JP 7-178289 A

  The heat pump-type clothes drying apparatus dehumidifies the moisture of the garment A wetted by the evaporator 66 to be used as an evaporation source of the refrigeration cycle, adds electric input for driving the compressor 68, and heats the air by the condenser 67. Thus, the operation of evaporating the moisture in the clothing A is repeated.

  However, in the conventional heat pump type clothes drying apparatus, it takes time until the clothes A are warmed and can be used as a condensation source of the refrigeration cycle, and during this time, the pressure of the compressor 68 hardly rises.

  When the temperature of the clothing A is low, especially when the outside air temperature is low, such as in winter, and the temperature of the washing / drying machine itself is low, the air circulating through the evaporator 66 and the condenser 67 constituting the refrigeration cycle is reduced. In order to exchange heat with this air, it is necessary to control the temperature of the refrigerant flowing through the evaporator 66 to be lower than that of the air so as to obtain energy for evaporating the refrigerant from the air.

  For this reason, the temperature of the refrigerant flowing through the evaporator 66 is 0 ° C. or lower until the temperature of the circulating air reaches a certain temperature or more. At this time, moisture condensed by the evaporator 66 forms frost on the surface of the evaporator 66. Or it may become ice and adhere. Such a state becomes resistance of the flow of circulating air and hinders heat exchange between the refrigerant and air. Further, in the condenser 67, since the circulating air is cooled as it goes downstream, the temperature on the downstream side becomes the lowest, from which the growth of frost and ice begins, and the resistance of the circulating air becomes low. And the heat exchange between air and air.

  Further, until the circulating air rises to a certain temperature, the generated frost repeatedly grows and melts on the surface of the evaporator 66, and the melted water is re-iced while flowing down to the lower surface side of the evaporator 66. End up. For this reason, there existed the subject of becoming the resistance of the circulating air and preventing the heat exchange of a refrigerant | coolant and air.

  Furthermore, when frost or ice grows in the evaporator 66 and heat exchange between the air and the refrigerant cannot be sufficiently performed, the refrigerant is not completely evaporated but is sucked into the compressor 68 in a liquid state. There was also a problem of affecting the reliability of the company.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a clothes drying apparatus that suppresses the growth of frost and ice in an evaporator even in a situation where the outside air temperature is low.

  In order to solve the above-described conventional problems, the clothes drying apparatus of the present invention is provided with a temperature detection means in the evaporator, and further provided with an air flow rate control means for controlling the circulation amount of the drying air, and the temperature detection means When a temperature equal to or lower than a predetermined value is detected, the air volume control means is controlled by the control device to reduce the circulation amount of the drying air.

  As a result, when the clothes drying device is operated at a low outside air temperature, the amount of circulating dry air can be reduced, the temperature drop of the evaporator can be blunted, and a condition that makes it difficult for frost to adhere to the evaporator can be formed It is. As a result, when the water evaporated from the clothing adheres to the evaporator, it is possible to suppress the supercooling and attach the water, to suppress a decrease in drying efficiency and to shorten the drying time, It is possible to reduce power consumption.

  The present invention suppresses the temperature drop of the clothes in the rotating drum by preventing the evaporator from freezing even when the evaporator is operated under conditions where the evaporator is easily frozen, such as at low outside air temperature. As a result, the drying time and power consumption can be reduced. In addition, it is possible to suppress the refrigerant evaporating action from being blocked due to freezing clogging of the evaporator, to suppress the return of the liquid refrigerant to the compressor, and to prevent the compressor from being damaged due to the liquid compression. Is.

  The invention according to claim 1 is a main body provided with a bottomed cylindrical water tank, a rotary drum rotatably disposed in the water tank, and a garment or the like placed on the rotary drum. A clothes drying device comprising an opening that enables opening, a lid that opens and closes the opening, and an air circulation device that circulates air in the water tank, wherein the air circulation device cools at least the circulating air A heat source device for heating, a circulation duct provided on both sides of the heat source device, with both ends opened in the main body, and provided in the heat source device or the circulation duct, and circulates air from the heat source device into the water tank The heat source device is composed of a refrigerant circulation circuit including a compressor, a condenser, an expansion valve, and an evaporator, and the heat source device detects the temperature of the evaporator. Provide means Further, an air flow control means for controlling the amount of circulating air flowing in the circulation duct is provided, and when the temperature detection means detects a temperature not more than a predetermined value, the air flow control means causes the air to flow in the circulation duct. This is to reduce the amount of circulating air.

  By adopting such a configuration, the temperature of the evaporator becomes a predetermined temperature or less at the start of operation under conditions where the evaporator is likely to be low, such as at low outside air temperature, or when the clothes drying apparatus is operated. In this case, the amount of circulating air can be reduced to suppress the rapid temperature drop of the evaporator, and the time for the evaporator temperature to be 0 ° C. or less can be shortened as much as possible, thereby causing frost to adhere to the evaporator. Can be difficult. As a result, an increase in ventilation resistance of the circulating air can be suppressed, and a decrease in heat exchange efficiency between the refrigerant and air can be suppressed. Therefore, the moisture evaporated from the clothing is likely to adhere to the evaporator before it becomes frost, and the drying time of the clothing is shortened, and the power consumption required for drying can be reduced. In addition, it is possible to suppress the refrigerant evaporating action from being blocked due to freezing clogging of the evaporator, to suppress the return of the liquid refrigerant to the compressor, and to prevent the compressor from being damaged due to the liquid compression. Is.

  The invention according to claim 2 is the invention according to claim 1, wherein the air flow control means is a circulation fan capable of air flow control, and when the temperature detection means detects a temperature below a predetermined value, The air volume of the circulating fan is reduced.

  According to such a configuration, the circulation air volume can be controlled by controlling the rotation speed of the circulation fan, and the temperature decrease of the evaporator can be suppressed with a relatively simple configuration.

  The invention according to claim 3 is the invention according to claim 1, wherein the circulation fan is a once-through fan, and the air flow control means is configured to reversely rotate the circulation fan by the controller, When the temperature detecting means detects a temperature equal to or lower than a predetermined value, the circulation fan is rotated in the reverse direction to reduce the air volume.

  By adopting such a configuration, the amount of circulating air is reduced by a simple control that controls the rotation direction of the circulating blower, and the rapid temperature drop of the evaporator is blunted to suppress frost formation on the evaporator. it can. As a result, it is possible to suppress the heat exchange action of the evaporator from being hindered due to freezing of moisture, to suppress a decrease in drying efficiency, to suppress a prolonged drying time, and to reduce power consumption. It can be done.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the air flow rate control means is a damper device that is provided in the circulation duct and whose opening degree is controlled by the control device. When the detecting means detects a temperature below a predetermined value, the damper device is controlled in the closing direction to reduce the circulating air volume.

  By adopting such a configuration, when the temperature of the evaporator becomes a temperature equal to or lower than a predetermined value, the circulation amount of the dry air can be reduced by controlling the opening degree of the damper device provided in the circulation duct. In addition, the temperature drop of the evaporator can be suppressed to suppress the frost formation on the evaporator, and the drying time can be shortened and the power consumption can be reduced.

  Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view of an oblique drum type washing and drying machine in Embodiment 1 of the present invention. FIG. 2 is a schematic diagram showing a system configuration of the oblique drum type washing and drying machine. FIG. 3 is a control pattern diagram showing control contents at the start of operation at the low outside temperature in the oblique drum type washing and drying machine. FIG. 4 is a control pattern diagram showing the control contents during operation at the low outside air temperature in the oblique drum type washing and drying machine.

  As shown in FIG. 1, a bottomed cylindrical water tank 3 elastically supported by a plurality of suspensions 2 is provided inside a main body 1 constituting a washing and drying machine. The vibration is absorbed by the suspension 2.

  Inside the water tank 3, there are provided a plurality of through holes 5 a in the peripheral wall, and a bottomed cylindrical and horizontal axis type rotary drum 5 that accommodates the clothes 4 is rotatably provided. Is done. On the front surface of the main body 1, an opening 1 a for inserting and removing the clothing 4 and a door 7 for opening and closing the same are provided.

  The front side of the water tank 3 and the rotating drum 5 also have similar openings 3a and 5b, respectively. The opening 3a of the water tank 3 is connected to the opening 1a of the main body 1 in a watertight manner by appropriate means such as a bellows 8 or the like. ing. A seal member 12 is provided between the water tank 3 and the rotating drum 5 to partition the opening 3 a side and the bottom side in a space formed by the water tank 3 and the rotating drum 5. The seal member 12 is arranged with a minute interval so as not to contact the rotating drum 5. Further, a drain port 3 b for discharging the washing water in the water tank 3 is provided at the bottom of the water tank 3, and is connected to a drain hose 10 having a drain valve 9.

  The circulation blower 11 constituting the blowing means includes a fan 11a and a motor 11b for driving the fan 11a, and is positioned in a corner space (upper part of the main body 1) formed by the upper surface 1b of the main body 1 and the water tank 3. It is provided to do.

  The motor 11b can change the rotation speed by means such as inverter control, and thus the blower 11 has a configuration in which the air volume is controlled by controlling the rotation speed of the motor 11b.

  An evaporator (heat absorber) 21 and a condenser (heat radiator) 23, which are fin-tube heat exchangers constituting the heat pump device 20 (FIG. 2), are arranged close to each other at the lower part of the back surface 1c of the main body 1. And the accommodated heat exchange air path 25 is arrange | positioned.

  Inside the heat exchange air passage 25, there are provided a heat absorber air passage 22 through which air flows from the direction of arrow b to the evaporator 21, and a radiator air passage 24 through which air flows from the condenser 23 in the direction of arrow c. It has been.

  Further, the heat absorber air passage 22 is connected to a discharge duct 26 communicating with the discharge side of the circulation fan 11, and the radiator air passage 24 is connected to an air supply duct 27 opened in the water tank 3. .

  The suction side of the water tank 3 and the circulating blower 11 is connected by an exhaust duct 28, and a filter 29 that captures washing waste, yarn waste, etc. that scatters during drying is removable in the middle of the exhaust duct 28. Is provided.

  Here, the heat exchange air passage 25, the discharge duct 26, the air supply duct 27, and the exhaust duct 28 correspond to the circulation duct of the present invention.

  Accordingly, the drying air blown by the circulation blower 11 flows from the discharge duct 26 to the heat absorber air passage 22 as shown by an arrow a, passes through the evaporator 21 and the condenser 23, and the radiant air air passage 24. From the air supply duct 27 through the air supply port (not shown) provided in the water tank 3 as shown by the arrow d.

  And it flows to the peripheral wall side of the rotating drum 5, is blocked by the sealing member 12, flows into the rotating drum 5 from a large number of through holes 5a as indicated by an arrow e, and is provided outside the water tank 3 as indicated by an arrow f. From the exhaust port (not shown) through the exhaust duct 28, the flow returns to the suction side of the circulation fan 11, and the above flow is performed for a predetermined time.

  Further, the evaporator 21 disposed in the heat exchange circuit 25 is provided with a temperature sensor 30 which is a temperature detecting means for detecting the temperature of the evaporator 21. This temperature sensor 30 may detect the temperature of the air around the evaporator 21.

  As shown in FIG. 2, the heat pump device 20 includes a compressor 31, a condenser 23, and an electric expansion valve whose degree of pressure reduction can be adjusted. 32 and the evaporator 21 are connected in a ring shape.

  The control device 33 controls the capacity of the compressor 31 and the blower 11 and the degree of pressure reduction of the electric expansion valve 32 in accordance with the temperature detected by the temperature sensor 30. At the start of operation of the washing / drying machine, the temperature sensor 30 is controlled. Has a timer function that switches the operation of the blower 11 to a specific operation only for a predetermined time ΔT1 when a temperature equal to or lower than a predetermined value is detected.

  Next, main operations of the washing / drying machine having the above-described configuration will be described. Here, the operation described below is a case where the operation is performed under a condition that the outside air temperature (ambient temperature of the washing and drying machine) is relatively high and frost formation is unlikely to occur in the evaporator 21.

  In the washing (washing) process, water is supplied into the water tank 3 by opening a water supply valve (not shown) with the drain valve 9 closed. Water is supplied into the water tank 3 until a predetermined water level is reached, and the drive motor 6 is driven to rotate the clothes 4 and the rotating drum 5 containing the washing water to perform washing.

  When the washing is completed, the drain valve 9 is opened to drain the water in the water tank 3 from the drain hose 10 to the outside of the washing dryer.

  Also, in the rinsing step after the next washing, water is supplied into the water tub 3 in the same manner as the above-described washing step, and then the garment 4 is rinsed by rotating the rotating drum 5. Open and drain the water in the water tank 3 from the drain hose 10 to the outside of the washing and drying machine.

  In the next dewatering step, the drain valve 9 is opened to drain the water in the water tank 3 from the drain hose 10 to the outside of the washing and drying machine, and then the rotating drum 5 containing the clothes 4 is fastened in one direction by the drive motor 6. It spins and dehydrates by its centrifugal force.

  And when the above-mentioned dehydration process is completed, it will move to a drying process. In this drying process, the compressor 31 of the heat pump apparatus 20 is operated. As a result, the refrigerant is compressed, and circulates through the condenser 23, the electric expansion valve 32 which is a decompression means, and the evaporator 21 by the pressure. In the condenser 23, heat is released by the compression of the refrigerant, and in the evaporator 21, the heat is absorbed by the refrigerant that has been decompressed by the electric expansion valve 32 and becomes a low pressure. In parallel with this, the circulating blower 11 is operated, and warm air heated by the heat radiation of the condenser 23 is blown into the water tank 3 through the air supply duct 27 from the air supply port. At this time, the rotary drum 5 is rotationally driven by the drive motor 6, and the garment 4 is stirred up and down.

  Therefore, the drying air heated by the condenser 23 is blown into the rotary drum 5 from the air supply port by the circulation fan 11. The hot air supplied into the rotating drum 5 takes moisture when passing through the gaps of the clothes 4, passes through the exhaust duct 28 from the exhaust duct 28 through the exhaust port 28 of the water tank 3 in a moist state, and passes through the blower 11 for circulation. To the heat exchange air passage 25 to reach the evaporator 21.

  When the wet warm air passes through the evaporator 21, sensible heat and latent heat are taken away and dehumidified, and separated into dry air and condensed water.

  When the dried air subsequently passes through the condenser 23, it is heated again by the condenser 23 to become hot air, and is supplied again into the water tank 3 and the rotating drum 5, and the above-described circulation is repeated thereafter.

  On the other hand, when the condensed water adheres to the evaporator 21 and saturates and falls, the condensed water is stored in a water storage chamber (not shown) provided at the lower portion and pumped up by a drain pump (not shown) and drained hose. 10 is discharged outside the machine.

  In this way, by using the heat pump device 20 for drying the clothing 4 and the like, the heat absorbed by the evaporator 21 is recovered by the refrigerant and radiated again by the condenser 23, and the amount of heat more than the input energy of the compressor 31 is obtained. Since it can give to the clothing 4, a drying efficiency can be improved. Therefore, shortening of drying time and energy saving can be realized.

  On the other hand, when the outside air temperature is equal to or lower than a predetermined value, when the heat pump device 20 is operated at the same degree of decompression at a so-called low outside air temperature, the evaporator 21 becomes transiently low in temperature, and as a result, contains moisture such as clothing 4. When the dry air passes through the evaporator 21, the moisture becomes frost and adheres to the evaporator 21, and if the operation is continued in that state, the evaporator 21 freezes and moisture cannot be condensed. .

  Next, the drying operation in the case where the temperature around the evaporator 21 is in a low outside air temperature state, for example, 5 ° C. or less will be described. Here, since the washing process to the dehydration process are the same as described above, the description thereof will be omitted and the drying process will be described here. The compressor 31 and the blower 11 are controlled by an inverter control device (not shown) so that the number of rotations (capacity) is well known.

  At the beginning of operation, the temperature sensor 30 detects the temperature of the evaporator 21 (or the vicinity thereof), and the circulation fan 11 and the compressor 31 are activated in synchronization (FIG. 3).

  When the compressor 31 is operated, the refrigerant flows through the condenser 23, the electric expansion valve 32, and the evaporator 21, and returns to the compressor 31. Due to the continuation of the refrigerant flow, the temperature of the condenser 23 gradually increases, and the temperature of the evaporator 21 gradually decreases.

  However, as shown in FIG. 3, since the rotation speed of the circulation fan 11 is controlled to be kept low for a predetermined time ΔT1 by the timer function of the control device 33, the evaporator 21 The heat exchange effect is small and the temperature drop is slow. Accordingly, the evaporator 21 is suppressed in time for which the temperature is 0 ° C. or lower, and therefore moisture frosting and freezing are also suppressed. As a result, the heat exchange action with the circulating air in the evaporator 21 is continued, and the adverse effect of sucking the liquid refrigerant into the compressor 31 due to gasification of the refrigerant is also suppressed.

  In other words, the temperature of the evaporator 21 for circulation continues to operate at a temperature slightly lower than the circulating air temperature, but the decrease is slow, while condensing due to the input energy of the compressor 31. The temperature of the vessel 23 gradually increases, and the temperature of the circulating dry air tends to gradually increase.

  When the time ΔT1 elapses, the control device 33 releases the low-speed maintenance operation of the circulation fan 11 and starts the normal operation. Since this state is set to a value at which the heat pump device 20 can exhibit high efficiency, both the heat radiation amount and the heat absorption amount by the heat pump device 20 increase, and the drying efficiency can be increased by reducing the humidity of the dry air. .

  In this state, when the temperature of the circulating dry air (temperature of the evaporator 21) decreases again, as shown in FIG. 4, the control device 33 again reduces the rotational speed (frequency) of the circulating blower 11. By controlling, it is possible to suppress frosting and freezing of the moisture contained in the circulating dry air on the evaporator 21. As a result, it is possible to prevent the drying operation from being significantly reduced. In this case, it is preferable to reduce the rotation speed (capacity) of the compressor 31 or to stop the operation of the compressor 31 as indicated by the broken line in the rotation speed characteristics of the compressor 31 of FIG. Such a control can be expected to have an effect of suppressing breakage of the compressor 31 due to liquid compression by suppressing the return of the liquid refrigerant to the compressor 31, especially when the compressor 31 capable of capacity control is used. .

  Further, in the actual use of the washing / drying machine, it has been in a low outside air temperature state from the start of operation, and when the control is performed as shown in FIG. 3 to shift to the normal control, as shown in FIG. In the case where the temperature of the evaporator 21 is 0 ° C. or less and the case where the control shown in FIG. 4 is accompanied after the control shown in FIG. 3, the temperature of the evaporator 21 is detected in either case. By doing so, it is possible to cope with it, and it is possible to suppress a decrease in drying efficiency due to frosting and freezing of the evaporator 21.

  In the first embodiment, the circulation fan 11 is provided in the exhaust duct 28. However, the circulation fan 11 is arranged in the air supply duct 27 as shown by the broken line in FIG. It is also possible.

  Further, the compressor 31 has been described as being controlled in rotation speed (capacity) by an inverter control device or the like. However, the compressor 31 may be a constant speed compressor and may control only the air flow rate of the blower 11 in the same manner as described above. It ’s good.

(Embodiment 2)
Next, a second embodiment will be described. FIG. 5 is a control pattern diagram showing the control contents at the low outside air temperature of the oblique drum type washing and drying machine in the second embodiment of the present invention. Here, since the configuration of the washing and drying machine is the same as that of the first embodiment, FIGS. 1 and 2 are used for the respective configuration requirements, and the control content of the drying process which is different from that of the first embodiment is mainly used. Explained. The circulation blower 11c uses a once-through blower represented by a crossflow fan, and the number of revolutions is controlled by means such as inverter control as in the first embodiment, and the air volume is controlled. It has become.

  By the drying operation start operation, the compressor 31 is started with a frequency conversion operation, and the blower 11c is also started with air volume control. Therefore, the heat pump device 20 starts a predetermined heat exchange action. When the temperature of the air flowing through the heat exchange air passage 25 is low, the temperature sensor 30 detects the temperature of the evaporator 21 and detects a temperature lower than a predetermined value (for example, 5 ° C.). Switches the rotation of the circulating blower 11c to the reverse rotation for the predetermined time ΔT1 by the timer function of the control device 33, and continuously operates the compressor 31. When the predetermined time ΔT1 elapses, the rotation of the circulation fan 11c is switched to the normal rotation again.

  As is well known, the once-through type fan (fan) has characteristics set in accordance with the forward rotation, and in the case of reverse rotation, the blowing direction does not change and the blowing capacity is reduced.

  Therefore, after the time ΔT1 has elapsed, normal operation is performed. Since this state is set to a value at which the heat pump device 20 can exhibit high efficiency, both the heat radiation amount and the heat absorption amount by the heat pump device 20 increase, and the drying efficiency can be increased by reducing the humidity of the dry air. .

  In this state, when the temperature of the circulating dry air (the temperature of the evaporator 21) decreases again, the rotational speed (frequency) of the circulating fan 11c is decreased again by the control device 33 as shown by the broken line in FIG. By controlling in such a manner, the amount of circulated air is reduced, and frosting and freezing of moisture contained in the dry air to the evaporator 21 can be suppressed. As a result, it is possible to prevent the drying operation from being significantly reduced. In this case, it is preferable to reduce the rotational speed (capacity) of the compressor 31 as shown by the broken line in the rotational speed characteristics of the compressor 31 in FIG. 5 or to stop the operation of the compressor 31.

  According to such control, the amount of circulating air is reduced by controlling the direction of rotation of the circulating blower 11c, the rapid temperature drop of the evaporator 21 is blunted, making it difficult for the temperature to become negative, and the rotating drum 5 The water evaporated from the inner garment 4 can be easily attached to the evaporator 21 as water droplets. Therefore, the drying time can be shortened and the power consumption can be reduced. Moreover, inhibition of the evaporating action of the refrigerant due to freezing clogging or the like of the evaporator 21 is suppressed, and the return of the liquid refrigerant to the compressor 31 is suppressed, so that damage to the compressor 31 due to liquid compression is suppressed. It is something that can be done.

  In addition, although the compressor 31 was demonstrated as what controls rotation speed (ability) by an inverter control apparatus etc., it is set as a constant speed compressor and it is good also as a structure which controls only the ventilation volume of the air blower 11 similarly to the above-mentioned. It ’s good.

(Embodiment 3)
Next, Embodiment 3 will be described. FIG. 6 is a schematic diagram showing a system configuration of the oblique drum type washing and drying machine according to the third embodiment of the present invention. FIG. 7 is a control pattern diagram showing control contents at a low outside air temperature in the oblique drum type washing and drying machine. Here, since the configuration of the washing / drying machine is the same as that of the first embodiment, FIG. 1 is used for the respective configuration requirements, and the configuration and the control content of the drying process are different from those of the first and second embodiments. Explain to the subject. The circulation fan 11 will be described as being at a constant speed where the air volume cannot be varied, but a fan whose air volume can be varied may be used as in the first embodiment.

  In the third embodiment, the configuration in which the electric damper device 34 controlled by the control device 33 is provided in the air supply duct 27 is different from the first and second embodiments. The damper device 34 is normally in a fully open state, and its opening degree is adjusted by the control device 33.

  In such a configuration, when the drying operation is started, the compressor 31 is started with a frequency conversion operation, and the blower 11 is also driven. Therefore, the heat pump device 20 starts a predetermined heat exchange action.

  When the circulating air temperature for drying flowing through the heat exchange air passage 25 is low, the temperature sensor 30 detects the temperature of the evaporator 21 and detects a temperature lower than a predetermined value (for example, 5 ° C.). Then, the control device 33 drives and controls the damper device 34 in a predetermined time ΔT1 closing direction (not fully blocked) by the timer function of the control device 33 as shown in FIG. As a result, the amount of circulating air flowing through the air supply duct 27 is reduced, the pressure difference between the condenser 23 and the evaporator 21 is reduced, and the temperature drop of the evaporator 21 is blunted.

  If necessary, such control as shown by a broken line can be added with control for restricting the upper limit rotational speed of the compressor 31 for a predetermined time ΔT1 (FIG. 7).

  Further, during the predetermined time ΔT1, the temperature of the condenser 23 also rises, and the circulating air temperature tends to rise relatively. Therefore, when the damper device 34 returns to the fully opened state after the lapse of the predetermined time ΔT1, the circulating air for drying is in a heated state and is included in the dry air due to the temperature drop of the evaporator 21. It is also suppressed that moisture forms on the evaporator 21.

  Therefore, the evaporator 21 has a shorter time of 0 ° C. or less, and the moisture adhering to the evaporator 21 is also suppressed from becoming frost, thereby suppressing a decrease in drying efficiency. Electric power can be reduced. Moreover, inhibition of the evaporating action of the refrigerant due to freezing clogging or the like of the evaporator 21 is suppressed, and the return of the liquid refrigerant to the compressor 31 is suppressed, so that damage to the compressor 31 due to liquid compression is suppressed. It is something that can be done.

  Such control is not limited to the time when the operation of the drying process is started, and can be similarly controlled even when the temperature of the evaporator 21 falls below a predetermined value during the drying operation.

  In the third embodiment, the circulation fan 11 is provided in the exhaust duct 28. However, the circulation fan 11 is arranged in the air supply duct 27 as shown by the broken line in FIG. It is also possible.

  The damper device 34 is not limited to the air supply duct 27 but can be provided in any one of the discharge duct 26, the heat exchange air passage 25, and the exhaust duct 28 constituting the circulation duct.

  As described above, the garment drying apparatus according to the present invention reduces the amount of dry air passing through the evaporator when the temperature of the circulated dry air is equal to or lower than a predetermined value, such as at a low outside air temperature. In addition to drying clothes, it can be used for drying grain and the like.

Sectional drawing of the diagonal drum type washing-drying machine in Embodiment 1 of this invention Schematic diagram showing the system configuration of the oblique drum type washing and drying machine The control pattern figure which shows the control contents at the time of the start of operation at the time of low outside temperature in the diagonal drum type washing and drying machine The control pattern figure which shows the control contents in the middle of the operation at the time of low outside temperature in the diagonal drum type washing / drying machine The control pattern figure which shows the control content at the time of the low outside temperature of the diagonal drum type washing-drying machine in Embodiment 2 of this invention The schematic diagram which shows the system configuration | structure of the diagonal drum type washing-drying machine in Embodiment 3 of this invention. The control pattern figure which shows the control contents at the time of the low outside temperature in the same drum type washing / drying machine Sectional view of a drum-type clothes dryer showing a conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 1a Opening part 3 Water tank 4 Clothes 5 Rotating drum 7 Door (lid body)
11 Blower (circulating fan)
11c Blower (circulating fan)
20 Heat pump device (heat source device)
21 Evaporator 23 Condenser 25 Heat exchange air passage (circulation duct)
26 Discharge duct (circulation duct)
27 Air supply duct (circulation duct)
28 Exhaust duct (circulation duct)
30 Temperature sensor (temperature detection means)
31 Compressor 32 Electric expansion valve 33 Control device 34 Damper device

Claims (4)

  A main body provided with a bottomed cylindrical water tank, a rotating drum rotatably disposed in the water tank, an opening provided in the main body and allowing clothes or the like to be put into the rotating drum, A clothes drying apparatus comprising a lid that opens and closes an opening, and an air circulation device that circulates air in the water tank, wherein the air circulation device includes at least a heat source device that cools and heats the circulating air, and the heat source. The heat source comprises: a circulation duct provided on both sides of the apparatus, and both ends opened in the main body; and a circulation fan provided in the heat source device or the circulation duct and circulating air from the heat source device into the water tank. The apparatus is composed of a refrigerant circulation circuit including a compressor, a condenser, an expansion valve, and an evaporator, and further provided with temperature detecting means for detecting the temperature of the evaporator in the heat source device, and the circulation duct Inside Air flow control means for controlling the flow rate of circulating air is provided, and when the temperature detection means detects a temperature equal to or lower than a predetermined value, the air flow control means reduces the amount of circulating air flowing through the circulation duct. Clothing drying device provided with a device.   2. The clothes drying according to claim 1, wherein the air flow control means is a circulation blower capable of air flow control, and the air flow of the circulation blower is reduced when the temperature detection means detects a temperature equal to or lower than a predetermined value. apparatus.   The circulation fan is a once-through fan, and the air flow control means is configured to reversely rotate the circulation fan by the control device, and when the temperature detection means detects a temperature of a predetermined value or less, the circulation fan The clothes drying apparatus according to claim 1, wherein the air volume is decreased by reversely rotating.   The air flow rate control means is a damper device provided in the circulation duct and the opening degree of which is controlled by the control device, and when the temperature detection means detects a temperature below a predetermined value, the damper device is The clothes drying apparatus according to claim 1, wherein the air flow is reduced by controlling in the closing direction.

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