JP2012231829A - Clothing dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clothing dryer that allows compression performance of a compressor to be changed so as to optimally maintain an entire energy balance of the clothing dryer including a heat pump device when drying an object to be dried, thereby allowing drying of the object to be dried with reduced energy irrespective of the state of the object to be dried.SOLUTION: A drum-type washing and drying machine 100 includes a heat pump device 13, an air circulation path 18, a compression performance changing unit 15, a thermistor 16, and a control unit 20. The thermistor 16 detects a surface temperature of a prescribed portion in coolant piping 14 of the heat pump device 13. The control unit 20 controls the compression performance changing unit 15 so as to change the compression performance of a compressor 7 on the basis of the variation of the surface temperature of the coolant piping 14 per unit time detected by the thermistor 16.

Description

  The present invention generally relates to a clothes drying apparatus, and more particularly to a clothes drying apparatus that dries an object to be dried by using a heat pump as a heat source.

  As a heat source for a clothes drying apparatus, a heat pump apparatus using a heat pump in addition to a heater has been known.

  The heat pump device includes a compressor, a condenser, an evaporator, and an expansion valve as a throttle means. A refrigeration cycle is formed in the heat pump device by connecting the compressor, the condenser, the evaporator, and the expansion valve by a pipe for circulating the refrigerant. In the heat pump device, the refrigerant circulates through this refrigeration cycle.

  In a clothes drying apparatus equipped with a heat pump device, the refrigerant gas compressed by the compressor is heated to a high temperature and increased in pressure, and is discharged from the compressor. In the condenser, the refrigerant gas discharged from the compressor exchanges heat with the air passing through the condenser. Thereby, the air which passes a condenser is heated. When the heated air is blown to a drum in which an object to be dried such as clothes is accommodated, evaporation of moisture contained in the object to be dried proceeds.

  On the other hand, the refrigerant gas is cooled in the condenser. The cooled refrigerant gas is liquefied when the pressure is reduced by the expansion valve. The air containing water vapor discharged from the inside of the drum to the heat pump device is heat-exchanged with the liquefied refrigerant when passing through the evaporator. Thereby, the air containing water vapor discharged to the heat pump device is cooled and dehumidified. At this time, the refrigerant evaporates and is returned to the compressor as refrigerant gas.

As drying of the object to be dried proceeds, an amount of heat corresponding to the power consumed by the compressor is accumulated in the air (drying air) circulating through the drum and the heat pump device. Therefore, when the drying air is continuously circulated as it is, the amount of heat of the entire drying air increases, and the amount of heat of the refrigerant circulating in the heat pump device increases to increase the pressure of the refrigerant. In this way, the energy of the heat pump device and the drying air increases. Also, as the refrigerant is increased in pressure and temperature, the power consumption of the compressor increases. When the refrigerant is increased in pressure and temperature, the amount of heat of the drying air increases, but the amount of heat that can be given to the object to be dried does not increase to the same extent. For this reason, the drying efficiency of the clothes drying device is lowered.
As described above, when the drying of the object to be dried proceeds and the amount of heat continues to be accumulated in the drying air, the entire energy related to the drying of the clothes drying apparatus is wasted.

  As a method for suppressing an increase in energy, it has been conventionally known that a part of drying air is discharged to the outside of the clothes drying apparatus. However, when a large amount of high-humidity air is discharged outside the clothes drying apparatus, various problems such as generation of mold around the clothes drying apparatus occur. Moreover, simply discharging the amount of heat corresponding to a part of the electric power consumed by the heat pump apparatus wastes electric power related to the operation of the clothes drying apparatus.

  The clothes drying apparatus according to Japanese Patent No. 3321945 (Patent Document 1) is premised on discharging high-humidity air to the outside of the clothes drying apparatus. However, in the heat pump device of the clothes drying apparatus according to Japanese Patent No. 3321945 (Patent Document 1), by changing the compression capacity of the compressor so that the temperature of the refrigerant in the condenser is kept below the set temperature, Reduces high-humidity air exhausted outside the clothes dryer. Thus, the clothing drying apparatus according to Japanese Patent No. 3321945 (Patent Document 1) suppresses the overall energy increase of the clothing drying apparatus.

  The clothes drying apparatus according to Japanese Patent Application Laid-Open No. 2004-358028 (Patent Document 2) has a variable compression capacity of the compressor so that drying air having a predetermined temperature or less is supplied to the drum when the object to be dried is dried. doing.

  A clothes drying apparatus according to Japanese Patent Application Laid-Open No. 2004-236965 (Patent Document 3) has a short-time drying mode and an energy-saving drying mode as drying operation modes. In the short drying mode, the drying capacity is shortened by increasing the capacity of the compressor. In the energy saving drying mode, energy required for drying the object to be dried is reduced by reducing the capacity of the compressor to a predetermined value. The clothes drying apparatus according to Japanese Patent Application Laid-Open No. 2004-236965 (Patent Document 3) reduces the compression capacity while keeping the temperature of the drying air at the upper limit value in the energy saving drying mode, thereby drying the object to be dried. The overall energy of the garment drying device required is kept to a minimum. In this way, the clothes drying apparatus according to Japanese Patent Application Laid-Open No. 2004-236965 (Patent Document 3) takes into consideration the balance between energy saving and shortening of the drying time, depending on the structure of the clothes drying apparatus, the air volume of the drying air, and the like. Appropriate drying is performed.

Japanese Patent No. 3321945 JP 2004-358028 A JP 2004-236965 A

  However, in the heat pump device of the clothes drying apparatus according to Japanese Patent No. 3321945 (Patent Document 1), it is assumed that high-humidity air is discharged outside the clothes drying apparatus. That is, it cannot be said that the consumption of energy related to the operation of the clothes drying apparatus is suppressed. Moreover, in order to reduce the high humidity air discharged | emitted outside the clothing drying apparatus, even if the compression capacity of the compressor is varied so as to suppress the pressure increase of the refrigerant, the clothing drying apparatus including the heat pump device No consideration is given to changing the compression capacity of the compressor so that the overall energy balance according to the above can be optimally maintained when the object to be dried is dried.

  Similarly, the clothes drying apparatus according to Japanese Patent Application Laid-Open No. 2004-358028 (Patent Document 2) and the clothes drying apparatus according to Japanese Patent Application Laid-Open No. 2004-236965 (Patent Document 3) both relate to a clothes drying apparatus including a heat pump device. No consideration is given to changing the compression capacity of the compressor so that the overall energy balance can be optimally maintained when the object to be dried is dried.

  Therefore, an object of the present invention is to change the compression capacity of the compressor so that the overall energy balance of the clothes drying apparatus including the heat pump device is optimally maintained when the object to be dried is dried. An object of the present invention is to provide a clothing drying apparatus capable of drying an object to be dried with less energy regardless of the state.

  The clothes drying apparatus according to the present invention is a clothes drying apparatus that uses a heat pump device including a compressor, a condenser, a throttle unit, an evaporator, and a refrigerant pipe as a heat source. The compressor compresses the refrigerant and raises the temperature of the refrigerant. The condenser heats air by exchanging heat between the refrigerant compressed by the compressor and the air. The throttle unit reduces the pressure of the refrigerant that has heated the air. The evaporator cools the air by exchanging heat between the decompressed refrigerant and the air. The refrigerant pipe connects the compressor, the condenser, the throttle unit, and the evaporator so that the refrigerant circulates in the order of the compressor, the condenser, the throttle unit, and the evaporator.

  The clothes drying apparatus according to the present invention includes a drying chamber, a blower, an air circulation path, a compression capacity variable unit, a physical quantity detection unit, and a control unit. The drying chamber stores an object to be dried. The drying chamber is supplied with air heated by a condenser. The blower blows air heated by the condenser to the drying chamber. The air circulation path has a first portion and a second portion. The first portion is disposed between the condenser and the drying chamber so that air heated by the condenser is supplied to the drying chamber. The second portion is disposed between the drying chamber and the evaporator so that air used for drying the object to be dried flows in the drying chamber toward the evaporator. The compression capacity variable unit changes the compression capacity of the compressor. The physical quantity detection unit detects at least one physical quantity selected from the group consisting of the temperature at a predetermined location of the heat pump device, the pressure of the refrigerant, and the temperature of the air flowing through the predetermined location of the air circulation path. The control unit controls the compression capacity variable unit so as to change the compression capacity of the compressor based on the change amount per unit time of the physical quantity detected by the physical quantity detection unit.

  As in the present invention, the energy that leaks out of the clothes drying device when the compression capacity variable section changes the compression capacity of the compressor based on the amount of change per unit time of the physical quantity detected by the physical quantity detection section. And the energy exchange amount of a to-be-dried target object and a heat pump apparatus, and the energy added to a compressor can be maintained in a balanced state. Thus, according to the present invention, it is possible to optimally maintain the overall energy balance of the clothing drying apparatus including the heat pump device when the object to be dried is dried.

  Therefore, it can suppress that a refrigerant | coolant becomes high pressure and high temperature, and can suppress the power consumption of a compressor. Further, while the operation of the clothes drying apparatus is continued, the amount of heat that is accumulated in the drying air is suppressed, so that the clothes drying apparatus can be dried regardless of the drying condition of the object to be dried. Sometimes the entire energy involved is not wasted. Thus, according to the present invention, the object to be dried can be dried with smaller energy regardless of the state of the object to be dried.

  In the clothes drying apparatus according to the present invention, the temperature of the predetermined portion of the heat pump device is preferably the temperature of any one of the discharge part of the compressor, the intermediate part of the condenser, or the throttle part.

  According to the configuration of the clothes drying apparatus according to the present invention, by detecting the temperature of any one of the discharge part of the compressor, the intermediate part of the condenser, or the throttle part, regardless of the state of the drying air. The state change of the refrigeration cycle of the heat pump device can be easily detected. Therefore, based on the state change of the refrigeration cycle of the heat pump device, the overall energy balance of the clothing drying device including the heat pump device can be optimally maintained when the object to be dried is dried. Thereby, a to-be-dried target object can be dried with smaller energy.

  In the clothes drying apparatus according to the present invention, the physical quantity detection unit is preferably arranged on the high pressure side of the heat pump device so as to detect the refrigerant pressure at a predetermined location of the heat pump device.

  According to this configuration, the state change of the refrigeration cycle of the heat pump device can be easily detected from the refrigerant pressure regardless of the state of the drying air. Therefore, the object to be dried can be dried with smaller energy.

  In the clothes drying apparatus according to the present invention, the air circulation path is preferably a closed space.

  According to this configuration, the energy balance between the drying air that circulates through the air circulation path that is a closed space and the heat pump device can be optimally maintained when the object to be dried is dried. In addition, according to this configuration, since the drying air is not discharged to the outside of the clothing drying device, it is possible to suppress wasteful energy consumption and prevent generation of mold around the clothing drying device. Can do.

  In the clothes drying apparatus according to the present invention, the temperature of the air flowing through the predetermined portion of the air circulation path is preferably the temperature of the air flowing through the inlet of the drying chamber in the first portion.

  Since the entrance of the drying chamber is in the vicinity of the connection portion between the air circulation path and the drying chamber, the physical quantity detection unit can be easily attached. Further, in the first part including the entrance of the drying chamber, air having a calorific value before being received by the object to be dried out of the air flowing through the air circulation path is circulating. Therefore, according to this configuration, the entire energy balance of the clothing drying apparatus including the heat pump device is optimized when drying the object to be dried, regardless of the state of the object to be dried, based on the state change of the drying air. It is possible to maintain. Thereby, a to-be-dried target object can be dried with smaller energy.

  In the clothes drying apparatus according to the present invention, the control unit controls the physical quantity detection unit to change the compression capacity of the compressor based on the change amount per unit time of the physical quantity detected by the physical quantity detection unit. It is preferable to continue to control the compression capacity variable section so that the detected value is constant.

  When the compression capacity of the compressor is changed, wasteful energy consumption can be suppressed. However, if the compression capacity of the compressor is changed, the evaporation amount from the object to be dried decreases while the object to be dried is dried, and the heat exchange amount in the evaporator decreases. The stability point of the refrigeration cycle changes and the pressure and temperature of the refrigerant decrease. When the pressure of the refrigerant decreases, the power consumption of the compressor is reduced, so that the drying time is extended. On the other hand, according to this configuration, the state reflecting the value detected by the physical quantity detection unit is kept constant, so that it is possible to reduce the time required for drying the object to be dried while suppressing the power consumption of the compressor. it can. Therefore, the object to be dried can be dried with less energy and without increasing the drying time.

  The clothes drying apparatus according to the present invention preferably further includes a first temperature / humidity detection unit, a second temperature / humidity detection unit, and a calculation unit. The first temperature / humidity detection unit preferably detects the first temperature and the first relative humidity of the air flowing through the first portion of the air circulation path. The second temperature / humidity detector preferably detects the second temperature and the second relative humidity of the air flowing through the second portion of the air circulation path.

  The calculation unit is configured to calculate the first absolute humidity of the air flowing through the first portion based on the first temperature and the first relative humidity detected every first unit time by the first temperature and humidity detection unit. Is calculated for each second unit time, and the second temperature is distributed based on the second temperature and the second relative humidity detected for each first unit time by the second temperature / humidity detection unit. The second absolute humidity of air is calculated every second unit time, and the absolute humidity difference between the calculated first absolute humidity and the second absolute humidity is calculated every second unit time. Is preferred. When the absolute humidity difference value calculated last time is larger than the absolute humidity difference value calculated this time, and when the absolute humidity difference value calculated this time is smaller than a predetermined value, the control unit It is preferable to end the process of drying the object to be dried.

  When drying an object to be dried using a heater as a heat source, water is used to dehumidify the steam contained in the drying air, making it difficult to detect changes in the humidity of the drying air. The drying end time was determined based on the temperature change of the air. On the other hand, in a clothes drying device using a heat pump device, the temperature change of the drying air at the end of drying is small compared to a clothing drying device using a heater as a heat source, and it is difficult to accurately determine the timing of the end of drying. Met. Therefore, a situation occurs in which the drying time is excessively extended, or the drying is finished while the object to be dried is not sufficiently dried.

  However, according to this configuration, it is possible to appropriately determine the end timing of drying of the object to be dried based on the first temperature and the first relative humidity, and the second temperature and the second relative humidity. . Therefore, the drying performance of the clothes drying apparatus can be improved. Moreover, the clothing drying apparatus according to the present invention can dry an object to be dried with smaller energy regardless of the state of the object to be dried. That is, the clothing drying apparatus capable of drying an object to be dried with smaller energy regardless of the state of the object to be dried is, by appropriately determining the end time of drying of the object to be dried, It is possible to further suppress the overall energy consumption related to the drying of the object to be dried.

  In the clothes drying apparatus according to the present invention, it is preferable that an exhaust port is formed in a part of the air circulation path. Moreover, it is preferable that the clothing drying apparatus according to the present invention further includes an opening / closing part that opens and closes the exhaust port. Furthermore, it is preferable that the control unit further controls the opening degree of the opening / closing unit based on the absolute humidity difference between the first absolute humidity and the second absolute humidity calculated every second unit time by the calculation unit. .

  Exhausting the drying air to the outside of the clothes drying device is effective only when it is executed in the second half of the drying process. It needs to be adjusted.

  On the other hand, according to this configuration, the timing for discharging the drying air is determined based on the absolute humidity difference between the first absolute humidity and the second absolute humidity calculated every second unit time by the calculation unit. be able to. At this time, the opening degree of the opening / closing part is adjusted based on the determined timing of discharging the drying air, so that the drying air can be discharged at an appropriate time, and the effect is maximized. Can do. Therefore, the drying performance of the clothes drying apparatus can be improved.

  As described above, according to the present invention, by changing the compression capacity of the compressor so as to optimally maintain the overall energy balance of the clothes drying apparatus including the heat pump device when drying the object to be dried, It is possible to provide a clothes drying apparatus capable of drying an object to be dried with less energy regardless of the state of the object.

It is the schematic which shows the structure of the drum type washing-drying machine which is an example of the clothing drying apparatus according to this invention. In one embodiment of the drum type washing and drying machine which is an example of the clothes drying apparatus according to the present invention, the temperature of the discharge part of the compressor as the temperature of the predetermined part of the heat pump device, the temperature of the intermediate part of the condenser, And it is a graph which shows the relationship between the temperature of a throttle part, and drying time. In a comparative example of one embodiment of a drum-type washing / drying machine which is an example of a clothes drying apparatus according to the present invention, the temperature of the discharge part of the compressor as the temperature of a predetermined part of the heat pump device, the middle part of the condenser It is a graph which shows the relationship between the temperature of this, and the temperature of a throttle part, and drying time. In another embodiment of the drum-type washing / drying machine as an example of the clothes drying apparatus according to the present invention, the relationship between the pressure of the refrigerant in the refrigerant pipe and the drying time, and the air flowing through the inlet of the drying chamber It is a graph which shows the relationship between temperature and drying time. In a comparative example of another embodiment of the drum type washing and drying machine which is an example of the clothes drying apparatus according to the present invention, the relationship between the pressure of the refrigerant in the refrigerant pipe and the drying time, and the inlet of the drying chamber are circulated It is a graph which shows the relationship between the temperature of the air to perform, and drying time. It is the schematic which shows the structure of the drum type washing-drying machine which is another example of the clothing drying apparatus according to this invention. In another example of the clothes drying apparatus according to the present invention, it is a flowchart of control of judgment for ending the drying process. In another example of a garment drying apparatus according to the present invention, the change of the first temperature and the first relative humidity of the air flowing through the first part with respect to the drying time and the first of the air flowing through the second part. It is a graph which shows an example with the change with respect to the drying time of temperature of 2 and 2nd relative humidity. It is a graph which shows an example of the relationship between the 1st absolute humidity of the air which distribute | circulates a 1st part, and drying time in another example of the clothing drying apparatus according to this invention. It is a graph which shows an example of the relationship between the 2nd absolute humidity of the air which distribute | circulates a 2nd part, and drying time in another example of the clothing drying apparatus according to this invention. It is a graph which shows an example of the relationship between the absolute humidity difference of 1st absolute humidity and 2nd absolute humidity, and drying time in another example of the clothing drying apparatus according to this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment A)
FIG. 1 shows a drum-type washing / drying machine 100 as an example of a clothes drying apparatus according to the present invention. As shown in FIG. 1, the drum type washing and drying machine 100 includes an outer box 1. The outer box 1 forms the outer shape of the main body of the drum type washing and drying machine 100. The outer box 1 has a substantially rectangular parallelepiped shape. The drum type washing and drying machine 100 includes a water tank 2, a rotating drum 3, and a motor 4 as a drive unit.

  The rotating drum 3 rotates around a rotation axis extending in the horizontal direction or in a direction inclined from the horizontal direction. As the material of the rotating drum 3, a stainless steel plate is generally used. A plurality of small holes (not shown) for water supply, drainage and ventilation are formed in the peripheral wall 3a and the bottom 3b of the rotary drum 3. The peripheral wall 3 a is a cylindrical part of the rotary drum 3. In the drum type washing and drying machine 100, the peripheral wall 3a has a substantially cylindrical shape. The peripheral wall 3a extends in a direction parallel to the direction in which the rotation axis extends.

  A plurality of baffles (not shown) are arranged on the peripheral wall 3a. The baffle extends substantially parallel to the rotation axis. Further, the baffle protrudes from the peripheral wall 3a inward in the radial direction of a circle centered on the rotation axis.

  The water tank 2 has a bottomed cylindrical shape. The rotating drum 3 is accommodated in the space inside the water tank 2. A counterweight (not shown) is attached to the lower part of the water tank 2. A plurality of counterweights may be attached to the water tank 2 in order to balance the entire water tank 2. The counterweight may be attached to the upper part of the water tank 2. A liquid balancer (not shown) is attached outside the edge of the opening of the rotary drum 3.

  The rotating drum 3 stores the laundry 5 as an object to be dried. A drive shaft 41 is fixed to the outer surface of the bottom 3 b of the rotary drum 3. The motor 4 is attached to the outer surface of the bottom 3 b of the water tank 2. The motor 4 is connected to the drive shaft 41.

  The drum-type washing / drying machine 100 is a clothes drying apparatus that uses a heat pump device 13 including a compressor 7, a condenser 8, an evaporator 10, and a throttle 9 as an expansion valve as a heat source. The compressor 7 compresses the refrigerant and raises the temperature of the refrigerant. The condenser 8 heats the air by exchanging heat between the refrigerant compressed by the compressor 7 and the air. The throttle unit 9 reduces the pressure of the refrigerant that heated the air. The evaporator 10 cools the air by exchanging heat between the decompressed refrigerant and the air. Further, the heat pump device 13 includes a refrigerant pipe 14. The refrigerant pipe 14 connects the compressor 7, the condenser 8, the throttle unit 9, and the evaporator 10 so that the refrigerant circulates in the order of the compressor 7, the condenser 8, the throttle unit 9, and the evaporator 10. .

  The drum type washing and drying machine 100 includes a drying chamber 32, a blower 11, an air circulation path 18, a compression capacity variable unit 15, a thermistor 16, and a control unit 20. A space inside the rotating drum 3 functions as a drying chamber 32. In addition, the air heated by the condenser 8 is supplied to the drying chamber 32. The blower 11 blows the air heated by the condenser 8 to the drying chamber 32. The air circulation path 18 has an outward path 12 as a first part and a return path 6 as a second part. The forward path 12 is disposed between the condenser 8 and the drying chamber 32 so that the air heated by the condenser 8 is supplied to the drying chamber 32. The return path 6 is arranged between the drying chamber 32 and the evaporator 10 so that the air used for drying the laundry 5 in the drying chamber 32 flows toward the evaporator 10. In the drum type washing and drying machine 100, the air circulation path 18 is a closed space.

  The compression capacity variable unit 15 changes the compression capacity of the compressor 7. The physical quantity detection unit detects the temperature of the discharge part of the compressor 7, the intermediate part of the condenser 8, or the throttle part 9 as the temperature at a predetermined location of the heat pump device 13. The drum type washing and drying machine 100 includes a thermistor 16 as an example of a physical quantity detection unit that detects a discharge unit of the compressor 7. The thermistor 16 detects the temperature of the discharge part of the compressor 7 as the surface temperature of the refrigerant pipe 14.

  The condenser 8 and the evaporator 10 are fin tube type heat exchangers. Inside the heat pump device 13, drying air flows through the evaporator 10 and the condenser 8 in this order. The compression capacity variable unit 15 includes an inverter circuit that controls a voltage for driving the compressor 7.

  In the drum type washing and drying machine 100, the calculation unit 21 calculates the amount of change per unit time of the temperature of the discharge unit of the compressor 7 detected by the thermistor 16. For example, the calculation unit 21 has a timer function (not shown). The controller 20 controls the compression capacity variable section 15 so as to change the compression capacity of the compressor 7 based on the amount of change per unit time in the temperature of the discharge section of the compressor 7 detected by the thermistor 16.

  The drying operation of the drum type laundry dryer 100 configured as described above will be described. When the motor 4 is driven, the rotary drum 3 is rotated, and driving of the blower 11 and the heat pump device 13 is started. The drying air flows through the air circulation path 18 as indicated by the white arrow by the airflow generated by the blower 11. In addition, the white arrow shown in FIG. 1 shows the direction in which an airflow flows roughly, and does not show the speed or scale of an airflow.

  The air flowing into the drying chamber 32 by the air flow generated by the blower 11 obtains moisture from the laundry 5 stirred in the drying chamber 32 and flows through the return path 6 toward the heat pump device 13. The air that has flowed into the heat pump device 13 from the return path 6 is dehumidified below the dew point by the evaporator 10. The air after being dehumidified is heated by the condenser 8 so as to have a high temperature and a low humidity, and flows again into the rotary drum 3 as drying air. By repeating such an air flow, the laundry 5 is dried.

  Next, heat exchange between the refrigeration cycle of the heat pump device 13 and the drying air will be described. The gaseous refrigerant (R134a) that has been heated to high pressure by the compressor 7 is sent to the condenser 8. In the condenser 8, the amount of heat of the refrigerant is radiated to the drying air, so that the liquefaction of the refrigerant proceeds. The refrigerant that has passed through the condenser 8 is decompressed by the throttle unit 9. In the throttle unit 9, the refrigerant whose pressure reduction and flow rate are controlled releases heat and changes to a low-temperature and low-pressure liquid. In the evaporator 10, gasification of the refrigerant proceeds by absorbing heat from the air returned from the drying chamber 32 to the heat pump device 13.

  Here, when an increase or decrease in the amount of heat of the refrigerant circulating in the heat pump device 13 is observed, the amount of heat taken by the drying air from the condenser 8 while the laundry 5 is dried returns from the drying chamber 32 to the heat pump device 13. The amount of heat consumed by the evaporator 10 from the air is larger by the amount corresponding to the power consumption of the compressor 7. Therefore, when the drying air is continuously circulated as it is, the amount of heat of the entire drying air increases, and the amount of heat of the refrigerant circulating in the heat pump device increases to increase the pressure of the refrigerant. Also, as the refrigerant is increased in pressure and temperature, the power consumption of the compressor increases. When the refrigerant is increased in pressure and temperature, the amount of heat of the drying air increases, but the amount of heat that can be given to the laundry 5 does not increase to the same extent, so that the drying efficiency for the laundry 5 decreases. .

  In the drum type washing and drying machine 100, the heat pump device 13 can be operated safely by the control unit 20 controlling the compression capacity variable section 15 so as to change the compression capacity of the compressor 7. Further, in the drum type washing and drying machine 100, the control unit 20 controls the compression capacity variable unit 15 based on the amount of change per unit time of the value detected by the thermistor 16. Specifically, when drying of the laundry 5 is started, the rotation speed of the compressor 7 is 2400 rpm.

  Based on the temperature detected by the thermistor 16, the calculation unit 21 calculates the amount of change in temperature per unit time. The unit time is, for example, 1 minute. When it is determined that the amount of change in the surface temperature of the refrigerant pipe 14 per unit time is less than 0.1 ° C., the control unit 20 so that the compression capacity variable section 15 changes the compression capacity of the compressor 7. Controls the compression capacity variable section 15.

  In the drum type washing / drying machine 100, the control unit 20 determines the control necessary for the operation of the drum type washing / drying machine 100.

  As described above, in the drum type washing and drying machine 100, the compression capacity variable unit 15 changes the compression capacity of the compressor 7 based on the amount of change per unit time in the surface temperature of the refrigerant pipe 14 detected by the thermistor 16. Thus, it is possible to maintain a state in which the energy leaked to the outside of the drum-type washing / drying machine 100, the energy exchange amount between the laundry 5 and the heat pump device 13, and the energy applied to the compressor 7 are balanced. Thus, according to the drum type washing / drying machine 100, the overall energy balance of the drum type washing / drying machine 100 including the heat pump device 13 can be optimally maintained when the laundry 5 is dried.

  Therefore, it can suppress that a refrigerant | coolant becomes high pressure and high temperature, and can suppress the power consumption of the compressor 7. FIG. Further, while the operation of the drum-type washing / drying machine 100 is continued, it is suppressed that the amount of heat continues to be accumulated in the drying air, so that the drum-type washing / drying is performed regardless of how the laundry 5 is dried. The entire energy related to the drying of the machine 100 is not wasted. In this way, according to the drum type laundry dryer 100, the laundry 5 can be dried with less energy regardless of the state of the laundry 5.

  In the drum type laundry dryer 100, the energy balance between the drying air flowing through the air circulation path 18 that is a closed space and the heat pump device 13 can be optimally maintained when the laundry 5 is dried. Further, since the air circulation path 18 is a closed space, the drying air is not discharged to the outside of the drum type washing and drying machine 100, so that wasteful energy consumption is suppressed and the periphery of the drum type washing and drying machine 100 is reduced. Generation of mold and the like can be prevented.

  Note that the physical quantity detection unit of the drum type washing and drying machine 100 does not detect the temperature of the discharge unit of the compressor 7 as the surface temperature of the refrigerant pipe 14, but the temperature of the middle part of the condenser 8 or the throttle unit 9. It may be detected or measured. Further, the physical quantity detection unit may be a pressure gauge that detects or measures the refrigerant pressure on the high pressure side of the heat pump device 13. The pressure gauge is arrange | positioned at the high voltage | pressure side of the heat pump apparatus 13, for example.

  Furthermore, the physical quantity detection unit of the drum type washing and drying machine 100 may measure or detect the temperature of the air flowing through a predetermined portion of the air circulation path 18. An example of the predetermined part of the air circulation path 18 is the inlet 33 of the drying chamber 32 in the forward path 12. An inlet 33 of the drying chamber 32 is formed at the bottom 2 b of the water tank 2. As described above, the physical quantity detection unit of the drum type washing and drying machine 100 uses the temperature of the air before flowing into the drying chamber 32, the surface temperature of the refrigerant pipe 14 on the high pressure side, or the refrigerant as the physical quantity on the high pressure side of the refrigeration cycle. Pressure is detected.

  In the drum type washing / drying machine 100, the time when the compression function of the compressor 7 is varied is the temperature of the discharge portion of the compressor 7, the intermediate portion of the condenser 8, the temperature of the refrigerant pipe 14 before the throttle portion 9, or Further, it may be determined based on the amount of change per unit time in the temperature of other refrigerant pipes 14. Further, the timing for changing the compression function force of the compressor 7 may be determined based on the amount of change in the pressure of the refrigerant in the refrigerant pipe 14 per unit time, and the air flowing through the inlet 33 of the drying chamber 32 may be determined. The temperature may be determined based on the amount of change per unit time. Note that the amount of change per unit time of these temperatures may be, for example, less than 0.1 ° C./minute, for example, as in the case where the temperature of the discharge section of the compressor 7 is used, or other amount of change. It may be.

  In the drum-type washing / drying machine 100, the thermistor 16 detects or measures the temperature of the discharge portion of the compressor 7 as the temperature of a predetermined portion of the heat pump device 13, thereby easily changing the state of the refrigeration cycle of the heat pump device 13. Can be detected. Further, when the drum type washing and drying machine 100 includes a physical quantity detection unit that detects the temperature of the intermediate part of the condenser 8, the heat pump device 13 is based on the surface temperature of the refrigerant pipe 14 in the intermediate part of the condenser 8. The change in the state of the refrigeration cycle can be easily detected. When the drum-type washing and drying machine 100 includes a physical quantity detection unit that detects the temperature of the throttle unit 9, the state change of the refrigeration cycle of the heat pump device 13 is based on the surface temperature of the refrigerant pipe 14 in front of the throttle unit 9. Can be easily detected. Therefore, according to the drum-type washing / drying machine 100, the overall energy balance of the drum-type washing / drying machine 100 including the heat pump device 13 is optimally maintained when the laundry 5 is dried based on the change in the state of the refrigeration cycle of the heat pump device 13. Is possible. Thereby, the laundry 5 can be dried with smaller energy.

  Moreover, when the pressure gauge is arrange | positioned at the high voltage | pressure side of the heat pump apparatus 13 so that the refrigerant | coolant pressure of the predetermined location of the heat pump apparatus 13 may be detected, it is freezing of the heat pump apparatus 13 irrespective of the state of drying air. A change in the state of the cycle can be easily detected from the refrigerant pressure. Therefore, the laundry 5 can be dried with smaller energy.

  On the other hand, in the drum-type washing / drying machine 100, when the thermistor 16 detects the temperature of the air flowing through the inlet 33 of the drying chamber 32 as the temperature of the air flowing through a predetermined portion of the air circulation path 18, the drying chamber Since the inlet 33 of 32 is in the vicinity of the connection part of the air circulation path 18 and the drying chamber 32, the thermistor 16 can be attached easily. Further, in the forward path 12 including the inlet 33 of the drying chamber 32, air having a heat amount before being received by the laundry 5 circulates among the air flowing through the air circulation path 18. Therefore, when the thermistor 16 detects the temperature of the air flowing through the inlet 33 of the drying chamber 32, the drum type laundry including the heat pump device 13 based on the state change of the drying air, regardless of the state of the laundry 5. It is possible to optimally maintain the overall energy balance of the dryer 100 when the laundry 5 is dried. Thereby, the laundry 5 can be dried with smaller energy.

  As described above, according to the drum type washer / dryer 100 according to the embodiment A, the drum type washer / dryer 100 including the heat pump device 13 is compressed so that the entire energy balance is optimally maintained when the laundry 5 is dried. By changing the compression capacity of the machine 7, it is possible to dry the laundry 5 with less energy regardless of the state of the laundry 5.

  In the drum type washing and drying machine 100, the control unit 20 changes the compression capacity of the compressor 7 based on the amount of change per unit time in the temperature of the discharge unit of the compressor 7 detected by the thermistor 16. After the control, the compression capacity variable unit 15 may continue to be controlled so that the value detected by the thermistor 16 is constant.

  Specifically, when it is determined that the amount of change per unit time in the temperature of the discharge portion of the compressor 7 detected by the thermistor 16 is less than a predetermined value, the compression capacity varying unit 15 causes the compressor 7 to change. The control unit 20 controls the compression capability variable unit 15 so as to change the compression capability. When drying of the laundry 5 is started, the rotational speed of the compressor 7 is 2400 rpm, for example. The predetermined value is, for example, 0.1 ° C. per minute. The rotation speed of the compressor 7 when changing the compression capacity of the compressor 7 is, for example, 2150 rpm.

The control unit 20 has a variable compression capability so that the temperature at the time point when the change amount per unit time of the temperature of the discharge unit of the compressor 7 detected by the thermistor 16 is determined to be less than a predetermined value is constant. Continue to control section 15 until the end of drying. For example, in the example shown in FIG. 2 to be described later, the temperature Th ₂ when it is determined that the temperature change amount per unit time (1 minute) of the discharge unit of the compressor 7 is less than 0.1 ° C. is 60 .1 ° C. The control unit 20 continues to control the compression capacity variable unit 15 until the drying is finished so that the temperature Th ₂ is constant. During this time, the rotational speed of the compressor 7 changes, for example, between 2150 and 2400 rpm.

  When the compression capacity of the compressor 7 is changed, useless energy consumption can be suppressed. However, if the compression capacity of the compressor 7 is changed, the evaporation amount from the laundry 5 decreases while the laundry 5 is being dried, and the heat exchange amount in the evaporator 10 decreases. The stability point of the refrigeration cycle changes and the pressure and temperature of the refrigerant decrease. When the pressure of the refrigerant decreases, the power consumption of the compressor 7 decreases, so that the drying time is extended. On the other hand, since the state reflecting the value detected by the physical quantity detection unit is kept constant as in the drum-type washing / drying machine 100, the time required for drying the laundry 5 is reduced while suppressing the power consumption of the compressor 7. can do. Therefore, the laundry 5 can be dried with less energy and without increasing the drying time.

  The change in compression capacity is not limited to reducing the compression capacity of the compressor 7. Further, the method or means for reducing the compression capacity of the compressor 7 is not limited to reducing the rotational speed of the compressor 7, and the compression capacity of the compressor 7 is reduced using other methods or means. It may be. For example, the compression capacity of the compressor 7 may be reduced by reducing the volume of the compression unit of the compressor 7. When the heat pump device 13 includes a plurality of compressors as the compressor 7, the cylinder of the compression unit of one of the compressors is stopped, or the refrigerant is prevented from flowing into any one of the compressors. By configuring the flow path, the compression capacity can be reduced.

  In addition, the position where the control part 20 is arrange | positioned in the drum type washing-drying machine 100 is not specifically limited. The control unit 20 shown in FIG. 1 is schematically shown as long as it has a desired function as described above.

(Example A)
In Example A, the drying process of the laundry 5 was performed in the standard test environment (temperature: 20 ° C., 65% RH) using the drum-type washing dryer 100 according to Embodiment A (see FIG. 1). . In Example A, in the drum type washing and drying machine 100, the compression capacity of the compressor 7 was changed based on the change amount per unit time of the predetermined physical quantity detected by the physical quantity detection unit.

(Example A1)
In Example A1, in the drum type washing and drying machine 100, when it is determined that the amount of change per minute of the temperature of the discharge portion of the compressor 7 detected by the thermistor 16 is less than 0.1 ° C., The compression capacity of the compressor 7 was changed. FIG. 2 shows the relationship between the temperature of the discharge portion of the compressor 7 and the drying time, the relationship between the temperature of the intermediate portion of the condenser 8 and the drying time, and the temperature of the throttle portion 9 as an expansion valve in Example A1. It is a graph which shows the relationship between and drying time.

In the example illustrated in FIG. 2, for example, around the point P ₁ , the amount of change in temperature per unit time (1 minute) of the discharge unit of the compressor 7 is 0.1 ° C. or more. On the other hand, around the point P _2, the amount of change in temperature per unit time (1 minute) of the discharge part of the compressor 7 is less than 0.1 ° C. In Example A1, based on the amount of change in this respect P _2, changing the compression capacity of the compressor 7. Specifically, the rotation speed of the compressor 7 was decreased from 2400 rpm to 2150 rpm.

  On the other hand, as Comparative Example A1, in the drying process, it was determined that the amount of change per minute of the surface temperature of the refrigerant pipe 14 of the discharge portion of the compressor 7 detected by the thermistor 16 was less than 0.1 ° C. Even in this case, the capacity of the compressor 7 was not changed. FIG. 3 shows the relationship between the temperature of the discharge portion of the compressor 7 and the drying time, the relationship between the temperature of the intermediate portion of the condenser 8 and the drying time, and the temperature of the throttle portion 9 as an expansion valve in Comparative Example A1. It is a graph which shows the relationship between and drying time.

  As shown in FIG. 3, when the capacity of the compressor 7 is not changed, the temperature of the discharge part of the compressor 7, the temperature of the intermediate part of the condenser 8 and the throttle part 9 are increased as the drying time advances. The temperature of the refrigerant pipe 14 before the temperature rises.

Based on the comparison between FIG. 2 and FIG. 3, the refrigerant temperature is suppressed from rising on the right side of the point P _{2 in} FIG. 2. Thus, in the drum type washing / drying machine 100, the power consumption of the compressor 7 can be suppressed. Further, while the operation of the drum-type washing / drying machine 100 is continued, it is suppressed that the amount of heat continues to be accumulated in the drying air. The entire energy related to the drying of the machine 100 is not wasted. In this way, according to the drum type laundry dryer 100, the laundry 5 can be dried with less energy regardless of the state of the laundry 5.

  Note that the amount of change per minute of the temperature of the discharge portion of the compressor 7, which is a determination target when changing the compression capacity of the compressor 7, is defined based on experiments. For example, when the amount of change per minute is zero, when changing the compression capacity of the compressor 7, the timing may not be appropriate. Moreover, it can be said that the amount of change in a range smaller than the range of the minimum error of measurement or detection of the thermistor 16 is not preferable as a judgment target.

  In Example A1, the timing for changing the compression capacity of the compressor 7 is determined based on the amount of change in the temperature of the discharge section of the compressor 7 per unit time. However, the determination may be made using the amount of change per unit time of the temperature of the refrigerant pipe 14 in front of the intermediate part of the condenser 8 or the throttle part 9 or the temperature of the other refrigerant pipes 14.

(Example A2)
In Example A2, in the drum type washing and drying machine 100, when the amount of change per minute in the pressure of the refrigerant in the refrigerant pipe 14 is less than 0.005 MPa, the compression capacity of the compressor 7 is changed. FIG. 4 shows the relationship between the refrigerant pressure on the high-pressure side (that is, the condenser 8 side) of the refrigerant pipe 14 and the drying time and the inlet 33 of the drying chamber 32 (that is, the air flows into the rotary drum 3 in Example 2). It is a graph which shows the relationship between the temperature of the air which distribute | circulates the opening for), and drying time.

As shown in FIG. 4, for example, around the point P ₃ , the amount of change in the refrigerant pressure per unit time (1 minute) is 0.005 MPa or more. On the other hand, around the point P _4, the amount of change in the refrigerant pressure per unit time (1 minute) is less than 0.005 MPa. Based on the amount of change at this point P ₄ , the compression capacity of the compressor 7 was changed. Specifically, the rotation speed of the compressor 7 was decreased from 2400 rpm to 2150 rpm.

  On the other hand, as Comparative Example A2, the capacity of the compressor 7 is not changed even when it is determined that the amount of change per minute in the pressure of the refrigerant in the refrigerant pipe 14 is less than 0.005 MPa in the drying process. It was. FIG. 5 shows the relationship between the refrigerant pressure on the high pressure side (that is, the condenser 8 side) of the refrigerant pipe 14 and the drying time and the inlet 33 of the drying chamber 32 (that is, the air flows into the rotary drum 3 in Comparative Example 2). It is a graph which shows the relationship between the temperature of the air which distribute | circulates the opening for), and drying time.

  As shown in FIG. 5, when the capacity of the compressor 7 is not changed, the pressure of the refrigerant in the high-pressure side refrigerant pipe 14 increases as the drying time advances.

Based on a comparison between FIG. 4 and FIG. 5, an increase in the refrigerant pressure is suppressed on the right side of the point P _{4 in} FIG. 4. In this way, according to the drum type laundry dryer 100, the laundry 5 can be dried with less energy regardless of the state of the laundry 5.

  In addition, the amount of change per minute of the pressure of the refrigerant in the refrigerant pipe 14, which is a determination target when changing the compression capacity of the compressor 7, is defined based on experiments. For example, when the amount of change per minute is zero, when changing the compression capacity of the compressor 7, the timing may not be appropriate. Moreover, it can be said that the amount of change in a range smaller than the range of the minimum error of measurement or detection of a device or the like that measures the pressure of the refrigerant is not preferable as a judgment target.

  In Example A2, the timing for changing the compression capacity of the compressor 7 is determined based on the amount of change in the pressure of the refrigerant in the refrigerant pipe 14 per unit time. However, it may be determined using the amount of change per unit time of the temperature of the air flowing through the inlet 33 of the drying chamber 32.

  As the rotation speed of the compressor 7, 2150 rpm is approximately 90% of 2400 rpm. As shown in FIG. 2 or FIG. 4, extremely good results could be obtained by reducing the rotational speed at the initial stage of drying to about 90% as in Example A1 and Example A2.

(Embodiment B)
Below, the drum type washing-drying machine 300 which concerns on Embodiment B is demonstrated. In addition, below, the same code | symbol is attached | subjected to the thing of the same structure as the drum type washing-drying machine 100 which concerns on Embodiment A, and the description is abbreviate | omitted.

  As shown in FIG. 6, the drum type washing and drying machine 300 further includes a temperature / humidity detection unit 61 as a first temperature / humidity detection unit and a temperature / humidity detection unit 62 as a second temperature / humidity detection unit. Yes. The temperature / humidity detector 61 detects the first temperature and the first relative humidity of the air circulating in the forward path 12 in the air circulation path 18. The temperature / humidity detector 62 detects the second temperature and the second relative humidity of the air circulating in the return path 6 in the air circulation path 18.

  In the drum-type washing / drying machine 300, an exhaust port 12 h is formed in a part of the air circulation path 18. The exhaust port 12 h is formed in a part of the forward path 12. The drum-type washing and drying machine 300 includes an opening / closing part 22 that opens and closes the exhaust port 12h. The opening / closing unit 22 is connected to the control unit 20, for example, electromagnetically or electronically.

  The arrangement of the temperature / humidity detection unit 61 and the temperature / humidity detection unit 62 is not particularly limited. The temperature / humidity detection unit 61 and the temperature / humidity detection unit 62 may be disposed outside or inside the tubular member forming the air circulation path 18.

  Hereinafter, control of determination for ending the drying process in the drum type washing and drying machine 300 will be described with reference to FIG.

As shown in FIG. 7, in step S01, in the drum type washing / drying machine 300, a washing process, a rinsing process, and a dehydrating process are performed based on a predetermined process. In step S02, in the drying process, the temperature / humidity detector 61 detects the first temperature T ₁ and the first relative humidity H ₁ every first unit time, and the temperature / humidity detector 62 detects the second temperature. The temperature T ₂ and the second relative humidity H ₂ are detected every first unit time.

Subsequently, in step S03, calculation unit 21, based on the first temperature T ₁ of the first and relative humidity H _1, the first absolute humidity of the air flowing through the forward path 12 numerical A ₁ second Calculate every unit time. Further, the calculation unit 21 calculates a numerical value A ₂ of the second absolute humidity of the air flowing through the return path 6 every second unit time based on the second temperature T ₂ and the second relative humidity H _2. To do.

In step S04, the calculation unit 21 calculates the absolute humidity difference A ₃ between the first absolute humidity value A ₁ and the second absolute humidity value A ₂ calculated in step S03 for each second unit time. calculate.

In step S05, the absolute humidity difference value A ₃ ′ calculated last time is compared with the absolute humidity difference value A ₃ calculated this time. In step S05, a numerical A ₃ of this calculated absolute humidity difference and a predetermined value At it is compared. The numerical value of the predetermined value At is a value when a dryness of 100.0% or more is achieved as the dryness of the laundry in the experimental system including the clothes drying apparatus, and is defined based on the experiment. ing.

In step S05, when the absolute humidity difference value A ₃ ′ calculated last time is larger than the absolute humidity difference value A ₃ calculated this time, and the absolute humidity difference value A ₃ calculated this time is predetermined. If the value is smaller than At, the process proceeds to step S07. If NO is determined in step S05, the process proceeds to step S06.

In step S06, the opening degree of the opening / closing part 22 is adjusted. In step S06, the control unit 20 predicts the degree of progress of the drying of the laundry 5 based on numerical A ₃ of absolute humidity difference, controls the opening and closing and opening of the opening and closing section 22.

  In step S07, a delayed operation is performed based on a predetermined process. Subsequently, in step S08, drying termination control is performed based on a predetermined process. After step S08, the drying process ends.

As described above, according to the drum-type washing and drying machine 300, washing is performed based on the first temperature T ₁ and the first relative humidity H ₁ and the second temperature T ₂ and the second relative humidity H _2. The end time of drying of the object 5 can be determined appropriately. Therefore, the drying performance of the drum type laundry dryer 300 can be improved. Further, similarly to the drum type laundry dryer 100 according to the embodiment A, the drum type laundry dryer 300 can dry the laundry 5 with less energy regardless of the state of the laundry 5. That is, the drum-type laundry dryer 300 that can dry the laundry 5 with less energy regardless of the state of the laundry 5 appropriately determines the end time of drying of the laundry 5, thereby washing the laundry 5. The overall energy consumption related to the drying of the object 5 can be further suppressed.

According to the drum type washing and drying machine 300, the numerical value of the absolute humidity difference by the calculating unit 21 first absolute humidity numerical A ₁ and the calculated every second time unit a numerical value A ₂ of the second absolute humidity Based on A ₃ , it is possible to determine the timing of discharging the drying air. At this time, the opening degree of the opening / closing part 22 is adjusted based on the determined timing of discharging the drying air, whereby the drying air can be discharged at an appropriate time, and the effect is maximized. be able to. Therefore, the drying performance of the drum type laundry dryer 300 can be improved.

  In the drum-type washing / drying machine 300, the first unit time and the second unit time may be the same time or different times.

  In the drum type washing and drying machine 300, the control unit 20 controls the physical quantity detection unit to change the compression capacity of the compressor 7 based on the change amount per unit time of the physical quantity detected by the physical quantity detection unit. The compression capacity variable unit 15 may continue to be controlled so that the value detected by is constant.

(Example B)
In Example B, the drying process of the laundry 5 was performed using the drum-type washing dryer 300 according to Embodiment B (see FIG. 6). In Example B, the rotational speed of the fan as a blower was rotated at 5000 rpm using laundry having a dry weight of 6 kg and a weight of 7.35 kg when water was included.

  In Example B, the temperature and humidity detector 61 is used to detect the first temperature and the first relative humidity every minute, and the temperature and humidity detector 62 is used to detect the second temperature and the second relative humidity. Humidity was detected every minute. FIG. 8 shows changes in the first temperature and the first relative humidity of the air flowing in the forward path 12 with respect to the drying time, and changes in the second temperature and the second relative humidity of the air in the return path 6 with respect to the drying time. It is a graph which shows. As shown in FIG. 8, the temperature change of the air flowing through the forward path 12 is relatively small from about 30 minutes after the start of drying to the end of drying.

  In Example B, the first absolute humidity is calculated every minute based on the first temperature and the first relative humidity, and based on the second temperature and the second relative humidity. The second absolute humidity was calculated every minute. FIG. 9 is a graph showing the relationship between the first absolute humidity of the air flowing through the forward path 12 and the drying time. FIG. 10 is a graph showing the relationship between the second absolute humidity of the air flowing through the return path 6 and the drying time.

  Furthermore, in Example B, the absolute humidity difference between the calculated first absolute humidity and the second absolute humidity was calculated every minute. FIG. 11 shows the absolute humidity difference per minute calculated from the first absolute humidity shown in FIG. 9 and the second absolute humidity shown in FIG.

  As shown in FIG. 11, the value of the absolute humidity difference for each drying time calculated from the first absolute humidity and the second absolute humidity gradually decreases significantly in the latter half of the drying process. As described above, in the drum-type washing / drying machine 300, the drying end time is determined based on the absolute humidity difference per unit time calculated from the first absolute humidity and the second absolute humidity. In the example shown in FIG. 11, it is determined that the drying is finished when about 130 minutes have elapsed from the start of the drying.

  The embodiment disclosed above should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above embodiments but by the scope of claims, and includes all modifications and variations within the meaning and scope equivalent to the scope of claims.

6: return path, 7: compressor, 8: condenser, 9: throttle unit, 10: evaporator, 11: blower, 12: forward path, 12h: exhaust port, 13: heat pump device, 14: refrigerant piping, 15: compression Capability variable section, 16: thermistor, 18: air circulation path, 20: control section, 21: calculation section, 22: opening / closing section, 32: drying chamber, 33: inlet, 61: temperature / humidity detection section, 62: temperature / humidity detection Part, 100: drum-type washing and drying machine

Claims (8)

A compressor that compresses the refrigerant to raise the temperature of the refrigerant, a condenser that heats the air by exchanging heat between the refrigerant compressed by the compressor and air, and a pressure reduction of the refrigerant that heated the air The refrigerant that circulates in the order of the throttle section, the evaporator that cools the air by exchanging heat between the decompressed refrigerant and the air, the compressor, the condenser, the throttle section, and the evaporator. And a refrigerant pipe connecting the compressor, the condenser, the throttle unit, and the evaporator, and a heat pump device,
A drying chamber for storing an object to be dried and supplied with air heated by the condenser;
A blower for blowing air heated by the condenser to the drying chamber;
A first portion disposed between the condenser and the drying chamber so that air heated by the condenser is supplied to the drying chamber, and drying of an object to be dried in the drying chamber. An air circulation path having a second portion disposed between the drying chamber and the evaporator such that utilized air flows toward the evaporator;
A compression capacity variable section for changing the compression capacity of the compressor;
A physical quantity detector that detects at least one physical quantity selected from the group consisting of a temperature at a predetermined location of the heat pump device, a pressure of the refrigerant, and a temperature of air flowing through the predetermined location of the air circulation path;
A clothes drying apparatus comprising: a control unit that controls the compression capacity variable section so as to change the compression capacity of the compressor based on a change amount per unit time of the physical quantity detected by the physical quantity detection section. The temperature of the predetermined portion of the heat pump device is the temperature of any one of the discharge section of the compressor, the intermediate section of the condenser, or the throttle section.
The clothing drying apparatus according to claim 1. The physical quantity detector is disposed on the high pressure side of the heat pump device so as to detect the refrigerant pressure at the predetermined location of the heat pump device.
The clothing drying apparatus according to claim 1. The air circulation path is a closed space;
The clothes drying apparatus according to any one of claims 1 to 3. The temperature of the air flowing through the predetermined portion of the air circulation path is the temperature of the air flowing through the inlet of the drying chamber in the first portion.
The clothing drying apparatus according to claim 1. The control unit is configured to change the compression capacity so that a value detected by the physical quantity detection unit is constant after controlling the compression capacity of the compressor to change based on a change amount of the physical quantity per unit time. Continue to control the department,
The clothes drying apparatus according to any one of claims 1 to 5. Of the air circulation path, a first temperature and humidity detector for detecting a first temperature and a first relative humidity of air flowing through the first portion;
A second temperature / humidity detector for detecting a second temperature and a second relative humidity of the air flowing through the second portion of the air circulation path;
The first absolute humidity of the air flowing through the first portion based on the first temperature and the first relative humidity detected every first unit time by the first temperature / humidity detection unit. For each second unit time, and based on the second temperature and the second relative humidity detected for each first unit time by the second temperature / humidity detection unit, The second absolute humidity of the air flowing through the portion is calculated every second unit time, and the absolute humidity difference between the calculated first absolute humidity and the second absolute humidity is calculated as the second absolute humidity. A calculation unit for calculating every unit time,
When the absolute humidity difference value calculated last time is greater than the absolute humidity difference value calculated this time and the absolute humidity difference value calculated this time is smaller than a predetermined value, the control unit To finish the process of drying the object to be dried,
The clothes drying apparatus according to any one of claims 1 to 6. An exhaust port is formed in a part of the air circulation path,
An opening / closing part for opening and closing the exhaust port;
The control unit further controls the opening degree of the opening / closing unit based on the absolute humidity difference between the first absolute humidity and the second absolute humidity calculated by the calculation unit every second unit time.
The clothes drying apparatus according to claim 7.

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