JP2005027934A - Laundry dryer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laundry dryer making air to be emitted to a storage chamber high temperature and effectively dissolving stuffiness. <P>SOLUTION: This laundry dryer 100 is provided with the storage chamber 10 storing objects to be washed (objects to be dried) and performing a drying operation of the objects to be washed in the storage chamber 10. This laundry dryer 100 is provided with a refrigerant circuit 20 formed by annularly piping and connecting a compressor 21, a gas cooler 22, an expansion valve 23, and a vaporizer 24 together in this order; an air passage 52 emitting the air heat-exchanged with the gas cooler 22 inside the storage chamber 10 by an air blower 75 and heat-exchanging the air passing through the storage chamber 10 with the vaporizer 24; and a damper 50 as a changeover means changing over between an inside air circulation mode sending the air heat-exchanged with the vaporizer 24 to the gas cooler 22 by the air blower 75, and an outside air introduction mode introducing the outside air to the gas cooler 22 by the air blower 75 and emitting the air heat-exchanged with the vaporizer 24 to the outside. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a dryer that includes a storage chamber for storing a material to be dried and that performs drying of the material to be dried in the storage chamber.

  Conventionally, such a dryer uses an electric heater or a gas combustion heater as a heat source, heats the outside air by the electric heater or the combustion heater to form high-temperature air, and then blows it into a storage chamber in which clothes and other objects to be dried are stored. The material to be dried in the storage chamber is dried. And the hot air in the storage chamber which dried the to-be-dried material was discharged | emitted outside.

  However, in a dryer using such an electric heater or a gas combustion heater, the high-temperature air sent into the storage chamber uses outside air that has low temperature outside the storage chamber and includes humidity. It takes a long time for things to dry. Therefore, there is a problem that the energy consumption for drying the object to be dried increases and the energy cost such as electricity bill and gas bill rises.

  Therefore, the clothes dryer uses a heat pump that is composed of a compressor, a heating coil, an expansion valve, and a cooling coil, and that has a refrigerant circuit that can circulate the heat exchange medium, and is covered with high-temperature air heated by the heating coil. There has also been developed a method of drying a dried product and condensing the moisture evaporated from the material to be dried in a cooling coil (see Patent Document 1 and Patent Document 2).

When drying an object to be dried with such a dryer, air that has been heat-exchanged with the radiator by a blower is discharged into the storage chamber, and the air that has passed through the storage chamber is heat-exchanged with the evaporator, and then again into the radiator. Inside air circulation type that returns and discharges into the storage chamber (see Patent Document 1 and Patent Document 2), air is introduced from the outside of the dryer, heat is exchanged with the radiator and discharged into the storage chamber, and the air passes through the storage chamber There is an outside air introduction type in which the heat is exchanged with the evaporator and then discharged to the outside (see Patent Document 3). Some air circulation systems communicate with the atmosphere (see Patent Document 4).
JP 2001-62194 A JP 2003-53089 A JP 11-99299 A Japanese Patent Laid-Open No. 10-33896

  However, in the case of the former internal air circulation type, if the drying of an object to be dried proceeds and the water contained therein decreases, the latent heat of vaporization of water decreases, so the temperature of the circulating air rises accordingly. That is, a phenomenon in which heat is trapped in the dryer occurs, equipment failure occurs, and the temperature of the air discharged to the object to be dried stored in the storage chamber becomes high, so that the object to be dried changes color, etc. Problems arise. Further, since the temperature of the circulating air becomes high, the temperature of the refrigerant that exchanges heat with the air also rises. As a result, the refrigerant pressure on the high-pressure side abnormally rises and the refrigerant circuit may be overloaded.

  On the other hand, in the case of the latter outside air introduction type, since the temperature of the air discharged into the storage chamber depends on the outside air temperature, it becomes difficult to raise the temperature of the air used for drying particularly at a low outside air temperature, and the object to be dried is dried. There is a problem that takes a long time. Therefore, it is necessary to use a large-capacity electric heater or compressor in order to shorten the drying time, which causes problems such as increased power consumption.

  In addition, in order to solve both problems, even if a part of the air circulation system is communicated with the atmosphere as described above, since the outside air is introduced and discharged through one opening, the replacement of the circulating air is sufficiently performed. Could not do.

  The present invention includes a storage chamber for storing a material to be dried, and in a dryer for performing a drying operation of the material to be dried in the storage chamber, a compressor, a radiator, a pressure reducing device, and an evaporator are sequentially piped in a ring. The air that has exchanged heat with the radiator is discharged into the housing chamber by the refrigerant circuit and the air blowing means, and the air path for exchanging heat with the evaporator through the air inside the housing chamber, and the evaporator and the heat by the air blowing means. An inside air circulation mode in which the exchanged air is sent to the radiator, and a switching means for switching to an outside air introduction mode in which the outside air is introduced into the radiator by the blowing means and the air exchanged with the evaporator is discharged to the outside. It is to be prepared.

  According to the invention of claim 2, the switching means is characterized in that the air temperature for drying is air in the air path or the air between the air discharge side of the evaporator and the air inlet side of the radiator is a predetermined protective temperature. In the above case, the outside air introduction mode is set.

  According to a third aspect of the present invention, in the above, the switching means is in a case where the drying air temperature is lower than the protection temperature, and when the drying air temperature is lower than the outside air temperature, the switching means is set to the outside air introduction mode. When it is higher than the outside air temperature, the inside air circulation mode is set.

  According to a fourth aspect of the present invention, in the first aspect of the invention, the switching means is set to the outside air introduction mode when the outside air temperature is equal to or higher than the predetermined temperature, and is set to the inside air circulation mode when the outside temperature is lower than the predetermined temperature.

  According to a fifth aspect of the invention, in the first aspect of the invention, the switching means can be switched manually.

  A dryer according to the present invention includes a storage chamber for storing a material to be dried, and performs a drying operation of the material to be dried in the storage chamber. The compressor, the radiator, the decompression device, and the evaporator are sequentially annular. A refrigerant circuit formed by pipe connection and air blowing means discharges air exchanged with the radiator into the accommodation chamber, and an air path for heat exchange between the air passing through the accommodation chamber and the evaporator and evaporation by the blowing means. Switching to switch between an internal air circulation mode in which air exchanged with the radiator is sent to the radiator, and an outside air introduction mode in which the outside air is introduced into the radiator by the blower and the air exchanged with the evaporator is discharged to the outside In the inside air circulation mode, the temperature of the air discharged into the storage chamber is sufficiently high, and the outside air introduction mode does not overload the refrigerant circuit while shortening the drying time and improving the drying efficiency. It is possible to prevent the.

  According to the second aspect of the present invention, the temperature of the drying air, which is the air in the air path or the air from the air discharge side of the evaporator to the air inlet side of the radiator, is equal to or higher than a predetermined protection temperature by the switching means. In this case, by setting the outside air introduction mode, it is possible to eliminate the accumulation of heat in the dryer and prevent the occurrence of overload of the refrigerant circuit and the occurrence of damage to the equipment and the object to be dried. Become.

  In the invention of claim 3, in addition to the above, the switching means is in a case where the drying air temperature is lower than the protection temperature, and when the drying air temperature is lower than the outside air temperature, the outside air introduction mode is set. When the temperature is higher than the outside air temperature, the inside air circulation mode is set, so that a more efficient mode can be selected according to the outside air temperature.

  In the invention of claim 4, in addition to the invention of claim 1, the switching means is set to the outside air introduction mode when the outside air temperature is equal to or higher than the predetermined temperature, and is set to the inside air circulation mode when the outside temperature is lower than the predetermined temperature. Sometimes, the temperature of the air discharged into the housing chamber is sufficiently increased without being affected by the outside air temperature, so that the drying time can be shortened and the drying efficiency can be improved.

  In the invention of claim 5, since the switching means can be manually switched in addition to the invention of claim 1, the outside air introduction mode and the inside air circulation mode can be arbitrarily changed in accordance with the use form of the user. become. Thereby, the convenience of a dryer improves.

  In order to solve the conventional technical problem, the present invention provides a dryer that can increase the temperature of air discharged into a storage chamber and effectively eliminate heat accumulation. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an example of a dryer to which the present invention is applied. For example, FIG. 2 is an internal configuration diagram viewed from the side of a washing dryer 100 that executes a washing operation and a drying operation after the completion of the washing operation. The figure which shows the flow of the air in the internal air circulation mode of the machine 100, FIG. 3 has each shown the figure which shows the flow of the air in external air introduction mode. The washing / drying machine 100 is used to wash and dry clothes to be washed (clothes to be dried) such as clothes, and the clothes to be washed are delivered to the center of the upper surface of the main body 1 forming the outline. An opening / closing door 3 is attached to the upper surface of the main body 1 on the side of the opening / closing door 3 and an operation panel (not shown) provided with various operation switches and a display unit is provided.

  A cylindrical resin-made outer tub drum 2 capable of storing water is provided in the main body 1, and the outer tub drum 2 is disposed with a cylindrical shaft in the left-right direction. A cylindrical stainless steel inner tub drum 5 serving as a washing tub and a dewatering tub is provided inside the outer tub drum 2. The inside of the inner tub drum 5 is a storage chamber 10 for storing the laundry, and this is also arranged with a cylindrical shaft in the left-right direction, and this shaft is on the side wall (the back side in FIG. 1) of the main body 1. It is connected to the shaft 8 of the mounted drive motor M, and is held rotatably around the shaft 8 in the outer tub drum 2.

  A watertight opening / closing lid (not shown) is provided on the upper part of the outer tub drum 2 in correspondence with the opening / closing door 3 to deliver laundry. In addition, a large number of through-holes 7 through which air and water can circulate are formed in the entire peripheral wall of the inner tank drum 5. In addition, the stop position of the inner layer drum 5 is defined, and an opening / closing cover (not shown) for delivering the laundry is provided at a position (upper surface) corresponding to the opening / closing cover of the outer tub drum 2 at the time of the stop. is doing.

  On the other hand, a water supply passage 15 as water supply means for supplying water into the inner tank drum 5 is provided at the upper part of the main body 1, and one end of the water supply passage 15 is a water supply valve 35 which also constitutes the water supply means. It is connected to a water supply source such as tap water. The water supply valve 35 is controlled to be opened and closed by a control device 110 described later. Further, the other end of the water supply passage 15 is connected to the inside of the outer tub drum 2 and communicated with the inside, and provided in the outer tub drum 2 when the water supply valve 35 is opened by the control device 110. Water (tap water) is supplied to the storage chamber 10 in the inner tank drum 5 from a water supply source.

  Further, a drainage passage 12 as a drainage means for discharging the water in the storage chamber 10 in the inner tank drum 5 is provided at the lower part of the main body 1, and one end of the drainage passage 12 is connected to the control device 110. Is communicated with the bottom of the outer drum 2 through a drain valve 13 whose opening and closing is controlled by (which also constitutes drainage means). Further, the other end of the drainage passage 12 is led out of the washing / drying machine 100 and reaches a drainage groove or the like.

  On the other hand, in the washer / dryer 100, a machine room 70 is formed from the lower side and / or rear side of the outer tub drum 2 in the main body 1 to the side.

  An air path 50 is provided in the main body 1. This air path 50 discharges the air heat-exchanged with the gas cooler 22 as a heat radiator by the blower 75 as a blower means into the storage chamber 10, and causes the air passing through the storage chamber 10 to exchange heat with the evaporator 24. This is the air passage.

  A blower 75 is provided at one end of the air passage 50, and the air is blown from the inlet of the air passage 50 to the accommodation chamber 10 of the inner tank drum 5 through the gas cooler 22 and the hollow portion 9 of the shaft 8. That is, the washing / drying machine 100 heats the air by heat exchange with the gas cooler 22 provided in the vicinity of the inlet of the air path 50 by the blower 75 during the drying operation, and then discharges the air into the storage chamber 10 in the inner tank drum 5. . Then, the air after circulating in the storage chamber 10 and drying the laundry is heat-exchanged with the evaporator 24 provided in the vicinity of the outlet of the air path 50 to cool and dehumidify. Yes.

  Both ends of the air path 50 are connected to a communication path 54 described later. The communication path 54 is a path for guiding the air that has exited the evaporator 24 to the gas cooler 22, and one end (upper end) of the communication path 54 is communicated with the inlet side of the air path 50, and the other end (lower end) is connected. It communicates with the outlet side of the evaporator 24. Further, an opening 56 communicating with the outside of the washing / drying machine 100 is formed at one end of the communication passage 54. The opening 56 can be opened and closed by a damper 50 as switching means. Here, the damper 50 sends an air circulation mode in which air exchanged with the evaporator 24 by the blower 75 is sent to the gas cooler 22, and introduces outside air into the gas cooler 22 by the blower 75 and exhausts the air exchanged with the evaporator 24. The damper 50 is switched to the outside air introduction mode for discharging to the outside from the opening 58, and the damper 50 is switched by a motor or a solenoid controlled by the control device 110.

  That is, in the inside air circulation mode, as shown in FIG. 2, the control device 110 closes the opening 56 of the communication path 54 with the damper 50 and makes the air path 52 and the communication path 54 communicate with each other. On the other hand, in the outside air introduction mode, the control device 110 opens the opening 56 by the damper 50 and closes the communication path 54 so that the air from the evaporator 24 does not flow to the gas cooler 22.

  The exhaust port 58 is formed in the vicinity of the evaporator 24 and is always open. However, in the inside air circulation mode, the opening 56 is closed, and the air path 52 and the communication path 54 are connected. Because of the communication, there is almost no air going in and out from here.

  Further, a temperature sensor 60 for detecting the temperature of the drying air that is the air in the air path 52 is installed on the outlet side of the evaporator 24 in the air path 52. In addition, an outside air temperature sensor 62 for detecting a temperature (outside air temperature) outside the washing / drying machine 100 is installed on the side wall or the back surface of the main body 1 of the washing / drying machine 100. The outputs of the temperature sensor 60 and the outside air temperature sensor 62 are connected to the control device 110.

  The drying air in the present invention means air in the air path 52 or air from the evaporator 24 outlet side to the gas cooler 22 inlet side, that is, air in the communication passage 54.

Next, 20 is the above-described refrigerant circuit, and the refrigerant circuit 20 is configured by sequentially connecting a compressor 21, a gas cooler 22 as a radiator, an expansion valve 23 as a pressure reducing device, an evaporator 24, and the like in an annular manner. Yes. The refrigerant circuit 20 is filled with a predetermined amount of carbon dioxide (CO ₂ ) as a refrigerant. Here, the compressor 21 used in the present embodiment is an internal intermediate pressure multistage compression rotary compressor, and includes an electric element in a hermetic container (not shown) and a first rotary compression element (1) driven by the electric element. Stage) and a second rotary compression element (second stage).

  Then, the low-pressure refrigerant is introduced from the refrigerant introduction pipe 30 to the first rotary compression element of the compressor 21, and the high-temperature and high-pressure refrigerant compressed by the second rotary compression element is discharged from the refrigerant discharge pipe 32 to the outside of the compressor 21. It is configured.

  The refrigerant discharge pipe 32 of the compressor 21 is connected to the inlet of an air heating gas cooler 22 provided on the inlet side of the air path 52. The piping exiting the gas cooler 22 is connected to the inlet of the expansion valve 23. The piping exiting the expansion valve 23 reaches the inlet of the evaporator 24 provided on the outlet side of the air path 52, and the outlet of the evaporator 24 is connected to the refrigerant introduction pipe 30 and reaches the compressor 21. The operation of the compressor 21 and the expansion valve 23 are controlled by the control device 110.

  The control device 110 described above is a control unit that controls the washing / drying machine 100, and operates the drive motor M, opens / closes the water supply valve 35 of the water supply passage 15, opens / closes the drain valve 13 of the drainage passage 12, and operates the compressor 21. The throttle adjustment of the expansion valve 23 and the air volume of the blower 75 are controlled. The control device 110 also controls the temperature of the air that has passed through the gas cooler 22 so that the laundry accommodated in the inner tub drum 5 is not discolored and damaged.

  Further, the control device 110 controls the damper 50 based on the outputs of the temperature sensor 60 and the outside air temperature sensor 62 so as to enter the inside air circulation mode or the outside air introduction mode.

  Next, the operation of the washing / drying machine 100 having the above configuration will be described. When a predetermined amount of detergent according to the amount of laundry and the amount of the laundry to be washed is put in the storage chamber 10 in the inner tub drum 5, and the power switch and the start switch among the operation switches described above are operated, the control is performed. The device 110 starts the washing operation. Then, the control device 110 opens the water supply valve 15 of the water supply passage 15 to open the water supply passage 15. Thereby, water is supplied from the water supply source into the storage chamber 10 of the inner layer drum 5 in the outer tub drum 2. At this time, the drain valve 13 of the drain passage 12 is closed by the control device 110.

  When a predetermined amount of warm water accumulates in the storage chamber 10 in the inner tank drum 5, the control device 110 closes the water supply valve 35 and closes the water supply passage 15. Thereby, the supply of water from the water supply source is stopped.

  Next, the drive motor M formed on the side surface of the main body 1 is energized and activated by the control device 110 to rotate the shaft 8, whereby the inner tank drum 5 attached to the shaft 8 rotates in the outer tank drum 2. The washing process of the washing operation is started.

  When a predetermined time has elapsed from the start of the washing process, the drive motor M is stopped by the control device 110, the drain valve 13 of the drain passage 12 is opened, and the inside of the storage chamber 10 of the inner tub drum 2 (that is, the outer tub drum 5). Water (washing water) will be discharged.

  When the water in the storage chamber 10 of the inner tub drum 5 is discharged, the control device 110 operates the drive motor M again to dehydrate the laundry. After performing this dehydration for a predetermined time, the control device 110 closes the drain valve 13 of the drain passage 12.

  Next, the control device 110 proceeds to the rinsing process, and opens the water supply valve 35 of the water supply passage 15 to open the water supply passage 15. Thereby, water is again supplied from the water supply source to the storage chamber 10 in the inner tank drum 5.

  When a predetermined amount of water is supplied to the storage chamber 10 in the inner tank drum 5, the control device 110 closes the water supply valve 35 and closes the water supply passage 15. Thereby, the supply of water from the water supply source is stopped.

  Then, after rinsing by repeating the rotation operation of the drive motor M for a predetermined time, the control device 110 stops the drive motor M and opens the drain valve 13 of the drain passage 12 to drain the rinse water in the storage chamber 10. Drain into the passage 12. When the rinsing water in the storage chamber 10 is discharged, the control device 110 operates the drive motor M again, rotates the inner tub drum 5 as described above, and shifts to a dehydration process in which the laundry is dehydrated.

  Then, after performing this dehydration process for a predetermined time, the control device 110 closes the drain valve 13. The control device 110 starts the operation of the blower 75 and activates the electric element of the compressor 21 to shift to the drying operation.

  At this time, the control device 110 is the case where the drying air temperature detected by the temperature sensor 60 is lower than a preset protection temperature (for example, + 50 ° C.), and the outside air temperature detected by the outside air temperature sensor 62. If it is higher, the inside air circulation mode is set. That is, as shown in FIG. 2, the opening 56 is closed by the damper 50, and the air path 52 and the communication path 54 are communicated.

When the compressor 21 is started, refrigerant (CO ₂ ) is sucked into the first rotary compression element of the compressor 21 and compressed. The refrigerant compressed to the intermediate pressure by the first rotary compression element is discharged into the closed container, and the refrigerant discharged into the closed container is sucked into the second rotary compression element and the second stage compression is performed. As a result, the refrigerant gas becomes a high-temperature and high-pressure refrigerant gas and is discharged from the refrigerant discharge pipe 32 to the outside.

  The refrigerant gas discharged from the refrigerant discharge pipe 32 flows into the gas cooler 22. Here, the high-temperature and high-pressure refrigerant compressed by the compressor 21 is not condensed and is operated in a supercritical state. The refrigerant when flowing into the gas cooler 22 has risen to about + 130 ° C., and the high-temperature and high-pressure refrigerant gas dissipates heat in the gas cooler 22. The refrigerant that has exited the gas cooler 22 is depressurized by the expansion valve 23, then flows into the evaporator 24 where it absorbs heat from the surroundings, evaporates, and is sucked into the first rotary compression element of the compressor 21 from the refrigerant introduction pipe 30. Start to circulate.

  In addition, the air in the air passage 52 heated by the heat radiation of the high-temperature and high-pressure refrigerant in the gas cooler 22 by the operation of the blower 75 is discharged into the storage chamber 10 of the inner tank drum 5 through the hollow portion 9.

  The heated air (+ 80 ° C. to + 110 ° C. at this time) discharged into the storage chamber 10 warms the laundry stored in the inner tub drum 5 (storage chamber 10), evaporates the moisture, and dries the laundry. Let Air containing moisture by drying the laundry (the air temperature is about + 50 ° C. to + 90 ° C.) goes out of the inner drum 5 from the through hole 7 through the storage chamber 10 and passes through the evaporator 24. Since the temperature of the evaporator 24 is lowered to about 0 ° C. to + 30 ° C. from the evaporation temperature of the refrigerant, moisture in the air condenses on the surface of the evaporator 24 in the process of passing through the evaporator 24 and becomes water droplets. Fall. The dropped water droplets are discharged from the drainage passage to an external drainage groove or the like via a drain pipe (not shown).

  Further, the air that has been dried by removing moisture by the evaporator 24 (the temperature drops to 0 ° C. to + 45 ° C.) has the opening 56 closed by the damper 50 as described above, and communicates with the air path 52. 54, since the air is sucked into the blower 75 provided at the inlet of the air passage 52 through the communication passage 54 and heated again by the gas cooler 22, as shown by the arrow in FIG. Is discharged into the storage chamber 10 of the inner tub drum 5 through the hollow portion 9 and is repeatedly circulated to remove moisture from the laundry in the inner tub drum 5 and dry it.

  On the other hand, when the drying air temperature detected by the temperature sensor 60 is lower than the protection temperature, the drying air temperature detected by the temperature sensor 60 is higher than the outside air temperature detected by the outside air temperature sensor 62. If it is low, the control device 110 closes the communication path 54 with the damper 50 and opens the opening 56 as shown in FIG. As a result, the air path 52 communicates with the outside of the washing / drying machine 100, and external air is introduced into the air path 52 of the washing / drying machine 100 (indicated by an arrow in FIG. 3).

  That is, air (outside air) outside the washing / drying machine 100 is introduced into the air path 52 from the opening 56 by the operation of the blower 75. The introduced air is heated by the heat radiation of the high-temperature and high-pressure refrigerant in the gas cooler 22 and becomes high temperature, and is discharged into the storage chamber 10 of the inner tank drum 5 through the hollow portion 9.

  The heated air discharged from the storage chamber 102 warms the laundry housed in the inner tub drum 5 to evaporate moisture and dry the laundry. The air containing moisture by drying the laundry is discharged out of the inner tank drum 5 from the through hole 7 through the storage chamber 10 and passes through the evaporator 24. Moisture in the air condenses on the surface of the evaporator 24 in the process of passing through the evaporator 24 and falls as water droplets. The dropped water droplets are discharged from the drainage passage 12 to an external drainage groove or the like via a drain pipe (not shown).

  Further, the air that has been dried by removing moisture by the evaporator 24 is discharged to the outside through the exhaust port 58 because the communication path 54 is closed by the damper 50.

  As described above, when the drying air temperature is lower than the protection temperature, the control device 110 controls the damper 50 so as to blow the higher air of the drying air temperature and the outside air temperature to the gas cooler 22. Therefore, the damper 50 is switched according to the outside air temperature, and the temperature of the air discharged into the storage chamber 10 can be made sufficiently high. Thereby, the drying time of the laundry can be shortened, and the driving efficiency can be improved.

  In particular, when an outside-air-introducing type washing and drying machine is used as in the prior art, since the outside air having a low temperature is introduced into the gas cooler, the air discharged into the storage chamber cannot be sufficiently heated. However, it takes a long time to dry the laundry, but when the drying air temperature is lower than the outside air temperature in the controller 110 as in the present invention, the outside air introduction mode is set, and the drying air temperature is the outside air temperature. If it is higher, the inside air circulation mode is set, so that hotter air can be discharged into the storage chamber 10. Thereby, the drying time of the laundry can be shortened, and the driving efficiency can be improved.

  On the other hand, when the drying air temperature detected by the temperature sensor 60 is equal to or higher than the protection temperature, the control device 110 closes the communication path 54 with the damper 50 and opens the opening 56 regardless of the outside air temperature. Set to introduction mode. As a result, the air path 52 communicates with the outside of the washing / drying machine 100, and air is introduced from the outside of the washing / drying machine 100.

  As described above, when the drying air temperature is equal to or higher than the preset protection temperature, the control device 110 controls the damper 50 so as to enter the outside air introduction mode as shown in FIG. When a conventional inside-air circulation type washing dryer is used, for example, if the laundry in the storage room is dried and the moisture in the laundry decreases, the latent heat of vaporization of water decreases. As a result, the temperature of the laundry dryer increased, the laundry dryer became hot, and the laundry dryer failed, or very hot air was discharged into the storage room, causing problems such as discoloration of the laundry. .

  In addition, when the temperature of the circulating air rises, the refrigerant temperature in the refrigerant circuit 20 also rises, and the refrigerant pressure on the high-pressure side abnormally rises.

  However, in the present invention, when the drying air temperature becomes equal to or higher than the protection temperature, the control device 110 exchanges (ventilates) the circulating air as the outside air introduction mode as shown in FIG. Will be able to. Thereby, it becomes possible to eliminate the heat accumulation as described above.

  Further, overloading of the refrigerant circuit 20 can be prevented beforehand. In general, the durability and reliability of the washer / dryer 100 can be improved.

  In this embodiment, the temperature sensor 60 is provided on the outlet side of the evaporator 24. However, the temperature sensor 60 is not limited thereto, and the drying air temperature on the inlet side and the outlet side of the gas cooler 22 and the drying air temperature in the storage chamber 10 Control is possible by detecting the drying air temperature in any of a series of paths from the air path 50 to the communication path 54, such as the drying air temperature on the inlet side of the evaporator 24. However, the temperature of the drying air at the outlet side of the evaporator 24, the inlet side of the gas cooler 22 and the storage chamber 10 as in the embodiment, that is, the inlet side of the evaporator 24 (shown by broken lines in each figure). If so, it is possible to accurately grasp the heat accumulation in the washing / drying machine 100.

  In the embodiment, the control device 110 controls the damper 50 as the switching means based on the outputs of the temperature sensor 60 and the outside air temperature sensor 62 to switch between the inside air circulation mode and the outside air introduction mode. Not limited to this, the damper 50 may be switched manually. In this case, it becomes possible to switch between the inside air circulation mode and the outside air introduction mode in accordance with the usage mode of the user of the washing / drying machine 100, and the convenience can be improved.

  Further, the switching means is not limited to the damper 50 used in the present embodiment, and other switching means may be used as long as the air flow can be switched.

  Further, the compressor 21 used in each of the above embodiments is an internal intermediate pressure type multi-stage (two-stage) compression type rotary compressor having the first and second rotary compression elements. However, the compressor 21 usable in the present invention is as follows. It is not limited to this.

In each of the above embodiments, carbon dioxide (CO ₂ ) is used as a refrigerant and the high pressure side pressure is operated as a supercritical pressure. However, the refrigerant that can be used in the dryer of the present invention is not limited to this, Even when an HFC (hydrocarbon fluoride) -based refrigerant is used, it is effective.

It is an internal block diagram of the washing-drying machine of the Example of this invention. It is a figure which shows the flow of the air in the case of the internal air circulation mode of the washing-drying machine of the Example of this invention. It is a figure which shows the flow of the air in the case of the external air introduction mode of the washing / drying machine of the Example of this invention. It is a figure which shows transition of the air temperature for drying in the washing-drying machine of the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Outer tank drum 3 Opening / closing door 5 Inner tank drum 8 Shaft 9 Hollow part 10 Accommodating chamber 12 Drainage passage 13 Drainage valve 15 Water supply passage 20 Refrigerant circuit 21 Compressor 22 Gas cooler 23 Expansion valve 24 Evaporator 30 Refrigerant introduction pipe 32 Refrigerant discharge Pipe 35 Water supply valve 50 Damper 52 Air path 54 Communication path 56 Opening portion 58 Exhaust port 60 Temperature sensor 62 Outside air temperature sensor 75 Blower 100 Washer / dryer 110 Controller

Claims (5)

In a drier that includes a storage chamber that stores a material to be dried, and performs a drying operation of the material to be dried in the storage chamber.
A refrigerant circuit in which a compressor, a radiator, a pressure reducing device, and an evaporator are sequentially connected in a pipe;
An air path for discharging air that has exchanged heat with the radiator into the housing chamber by a blower, and for exchanging heat with the evaporator through air that has passed through the housing chamber;
An inside air circulation mode in which air exchanged with the evaporator by the blowing means is sent to the radiator, and outside air is introduced into the radiator by the blowing means, and the air exchanged with the evaporator is discharged to the outside. And a switching means for switching to the outside air introduction mode.   When the air temperature for drying which is the air in the air path or the air from the air discharge side of the evaporator to the air inlet side of the radiator is equal to or higher than a predetermined protection temperature, the switching means is 2. The dryer according to claim 1, wherein an outside air introduction mode is set.   The switching means is when the drying air temperature is lower than the protection temperature, and when the drying air temperature is lower than the outside air temperature, the outside air introduction mode is set, and the drying air temperature is higher than the outside air temperature. 3. The dryer according to claim 2, wherein the inside air circulation mode is set.   2. The dryer according to claim 1, wherein the switching means is set to the outside air introduction mode when the outside air temperature is equal to or higher than a predetermined temperature, and is set to the inside air circulation mode when the outside air temperature is lower than the predetermined temperature.   2. The dryer according to claim 1, wherein the switching means can be switched manually.

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