JPH0741120B2 - Heat pump dryer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat pump type drying device used for, for example, drying clothes after washing.

(Prior Art) As a conventional example of the above-mentioned drying device, for example,
The separate type air conditioner described in JP-A-62-45615 can be mentioned. In the device, a simple drying chamber is formed by surrounding the outdoor unit arranged outdoors with a curtain wall or the like, and the outdoor unit is configured to have a function of dehumidifying the air passing therethrough. There is. That is, two heat exchangers are provided in the outdoor unit, and during the drying operation, the refrigerant from the compressor is circulated through the two heat exchangers, one of which acts as an evaporator and the other of which acts as a condenser. Dehumidification is performed by first cooling the air passing through them, and then the dehumidified air is heated to return to the suction temperature and blown out as dry air.
By circulating this dry air in the drying chamber, clothes after washing, which are suspended in the drying chamber, are dried.

In the above case, the dehumidified air is blown to the clothes by using the heat pump cycle, but the air whose relative humidity is lowered by heating the air and increasing the temperature is blown to the clothes to be dried. It is also possible, in the case of this hot air blowing drying, a drying unit having a drying heat exchanger that acts as a condenser is installed in the drying chamber as a configuration that is substantially the same as the indoor unit and is connected to the outdoor unit. Drying clothes etc. by arranging them and installing a ventilation fan to appropriately discharge hot air containing a large amount of evaporated water to clothes after being heated by the drying heat exchanger It is possible to configure a drying device for doing so.

(Problems to be Solved by the Invention) By the way, the drying speed of clothes and the like in the above-mentioned warm air blowing drying operation is determined by the absolute amount of moisture that can be allowed in the heated air heated by the heat pump cycle and the amount of water before heating into the drying chamber. It is approximately proportional to the difference with the amount of water already contained in the air.

However, in the prior art, since the air in the drying chamber is uniformly heated to the heating upper limit temperature in the heat pump cycle, for example, when the inflowing air temperature to the drying chamber is low in winter, and the air temperature in summer is low. In general, the higher the temperature, the greater the amount of water contained at higher temperatures, resulting in a large difference in the drying time. As a result, for example, in the case of a configuration in which the warm air blowing / drying operation time is set by a timer, it is necessary to perform an operation of changing the operation time according to, for example, a change in the season. It is not easy to obtain the exact coincidence between the end of the drying and the end of the drying, and the operation may be continued after the completion of the drying, or the timer may end in the dry state. As described above, in the conventional case, since the temperature inside the drying chamber is uniformly increased to a constant temperature, a large variation is likely to occur in the drying time, and as a result, for example, the timer cannot be set accurately as described above. However, there are problems that the operability and the comfort of use of the user are impaired, and that the operating cost for connecting unnecessary driving becomes excessive. Furthermore, in the past, it was necessary to take in dry clothes by entering a drying room that is in a high temperature atmosphere at the end of the drying operation, which gives a great discomfort to the user at this time and It also reduces comfort.

The present invention has been made in view of the above, and an object thereof is to provide a heat pump type drying device capable of improving the comfort of use by the user and reducing the operating cost.

(Means for Solving the Problems) Therefore, as shown in FIG. 1, the heat pump type drying apparatus according to the first aspect of the present invention is a heat exchanger 23 for drying and a heat source arranged in the drying chamber 10. The side heat exchanger 15 and the compressor 16 are connected to form a refrigerant circulation circuit, and a ventilation fan 26 for discharging the air in the drying chamber 10 to the outside is provided, and the indoor temperature of the drying chamber 10 is detected. While providing the room temperature detection means 27, while operating the ventilation fan 26 during the dry operation,
A heat pump type drying device comprising an operation control means 13 for controlling the heat pump heating operation so that the drying heat exchanger 23 acts as a condenser to bring the indoor temperature close to a set temperature, and the operation control means 13 is First set temperature changing means 31 for changing the set temperature in the same direction as the high and low temperature direction according to the high and low temperature state of the detected temperature at the start of operation.
When the detected room temperature at the start of operation is below the reference value, only the ventilation fan 26 is operated after the drying operation is completed.On the other hand, when the detected room temperature exceeds the reference value, the drying operation is completed after the completion of the drying operation. It is characterized by having a termination operation control means 36 for performing termination operation for switching the heat exchanger 23 to the refrigerant circulation which acts as an evaporator and lowering the indoor temperature, respectively.

Further, the heat pump type drying device according to the second aspect is the device according to the first aspect, further provided with a humidity detecting means 28 for detecting the humidity in the air, and depending on whether the detected humidity at the start of operation is high or low. The operation control means 13 has a second set temperature changing means 32 for changing the set temperature in the same direction as the high and low humidity directions.

Further, a heat pump type drying apparatus according to a third aspect is the apparatus according to the first or second aspect, wherein a fixed temperature fixed operation selection switch is provided, and when the fixed temperature fixed operation is selected, the first or The operation control means 13 has a fixed room temperature setting means 33 for setting the temperature near the upper limit of the setting range by the second setting temperature changing means 31, 32 as the setting temperature.

Further, the heat pump type drying apparatus according to the fourth aspect is the ventilation fan 26 according to the second aspect, when the detected room temperature at the start of operation is equal to or higher than the reference room temperature and the detected humidity is equal to or lower than the reference humidity. The above operation control means 13 has a low humidity operation control means 37 for performing only the dry operation by operating only the above.

(Operation) In the heat pump type drying device according to the first aspect, the room temperature at the start of operation, that is, the air temperature before heating is detected, and the high and low temperature directions are changed according to the high and low temperature state of the detected temperature. Since the heat pump heating operation is performed after changing the set temperature in the same direction, the difference between the allowable moisture content in the air after heating and the moisture content contained in the air before heating is calculated by heating. It is possible to keep the temperature substantially constant even when the previous air temperature changes. As a result, the drying time can be made substantially constant even when there is a large difference in the temperature of the air flowing into the drying chamber 10 such as in summer and winter. Therefore, for example, when a timer operation is performed, it is not necessary to change the operation time according to the change of seasons, and the operability and the comfort of use are improved, and the end of drying and the end of the timer are Since it is easier to match more accurately, unnecessary driving can be suppressed,
It is possible to reduce operating costs. In addition, in the heat pump type drying device, the room temperature lowering operations of the ventilation fan 26 and the heat pump system are automatically selected according to the detected room temperature at the start of the operation. That is, when the temperature of the air flowing into the drying chamber 10 is low, it is possible to quickly lower the room temperature only by operating the ventilation fan 26. As a result, the comfort of the user is improved and the heat pump system is improved. Since the unnecessary operation of is suppressed, the room temperature can be lowered with less operating cost.

Further, in the heat pump type drying device according to the second aspect, the set temperature is changed also depending on the detected humidity at the start of operation. This makes it possible to more accurately grasp the amount of water already contained in the air that has flowed into the drying chamber 10 before heating, so that the drying time can be more accurately fixed when the inflowing air state changes. It is possible to further improve the comfort of use for the user and reduce the operating cost.

In the heat pump type drying device according to the third aspect, the operation is performed by fixing the set temperature in the vicinity of the heating upper limit temperature in the heat pump system according to the user's selection.
As a result, the drying time can be shortened, and the user's comfort of use is further improved.

In the heat pump type drying device according to the fourth aspect, it is determined that the inflowing air state into the drying chamber 10 is a preset high temperature and low humidity state. At this time,
Drying is performed by operating only the ventilation fan 26 without performing the heat pump heating operation. That is, the above high temperature,
The low-humidity air is capable of containing a large amount of evaporated water without heating it, that is, it has a large drying ability, so that the air is dried. As a result, the operating cost can be reduced as compared with the case where the heat pump heating operation is used uniformly.

(Examples) Next, specific examples of the heat pump type drying device of the present invention will be described in detail with reference to the drawings.

FIG. 2 shows a schematic diagram of the entire configuration of a device that constitutes a drying device according to an embodiment of the present invention and is configured as a multi-function heat pump system having an air conditioning function, a hot water supply heating function, and a bathtub hot water reheating function. ing. In the figure, reference numeral 1 denotes an outdoor unit, and a compressor, an outdoor heat exchanger serving as a heat source side heat exchanger, and the like are housed in the outdoor unit 1. Further, the outdoor unit 1 is connected to the reheating unit 8 having the indoor units 2, 3, 4, the hot water tank 5, and the bath heating heat exchanger 7 for heating hot water in the bathtub 6, respectively. Furthermore, a drying unit 9 having a drying heat exchanger connected in series to the bath heating heat exchanger 7 is arranged on the ceiling of the bathroom. The drying unit 9 may be provided on the ceiling of a dressing room adjacent to the bathroom. Hereinafter, the room in which the drying unit 9 is arranged will be described as a drying room 10. The drying chamber 10 is appropriately provided with a drying rod (not shown) or the like for suspending clothes so as to be used for drying wet clothes after washing. In other words, the living space can be used more effectively by using the bathroom or undressing room that is normally unused except when taking a bath as a clothes drying room.

The above-mentioned compressor is operated by the inverter frequency control with the compression capacity corresponding to the total load of each utilization side heat exchanger. A heat pump operation control device 11 that circulates a refrigerant through each usage-side device that has an operation request while monitoring the entire multifunction heat pump system is provided in the outdoor unit 1. In the following, only the drying operation in which the refrigerant is circulated through the drying unit 9 will be described. This is because the operation start switch of the dry operation remote controller 12 connected to the drying unit 9 is turned on by the user.
It is started when a drying operation request signal is transmitted from the drying operation control device (operation control means) 13 provided in the drying unit 9 to the heat pump operation control device 11 when operated. Details will be described later.

In addition, as described above, the series connection to the bath heating heat exchanger 7 of the drying heat exchanger is based on the assumption that the clothes are not dried and bathed in the drying chamber 10 at the same time. .
That is, when there is no hot water in the bathtub 6 and hot water does not circulate in the reheating unit 8, heat exchange does not occur in the bath heating heat exchanger 7, and the refrigerant passes through the heat exchanger and is supplied to the drying heat exchanger. On the other hand, when the circulation fan attached to the drying heat exchanger is stopped and the refrigerant is circulated in the drying heat exchanger, the drying heat exchanger acts as a mere refrigerant pipe, Only one of the heating heat exchanger 7 and the drying heat exchanger can selectively function as a condenser or an evaporator.

FIG. 3 is a perspective view showing the structure of the drying unit 9. On the lower surface of the drying unit 9, a suction port 21 is formed on the right side and a blowout port 22 is formed on the left side in the drawing, and between the suction port 21 and the blowout port 22, the above-mentioned drying heat exchanger is formed. 23 are erected. Furthermore, this drying heat exchanger
A circulation fan 24 composed of a sirocco fan is arranged adjacent to 23, and the heat exchanger 23 for drying and the circulation fan are provided.
24 is surrounded entirely by a casing 25. By operating the circulation fan 24, the air in the drying chamber 10 passes through the inlet 21 and the heat exchanger 23 for drying, and then is blown out from the outlet 22 to dry the chamber 10 and the drying unit 9.
It is designed to circulate and. Also the above casing
A ventilation fan 26 is further provided on the side wall surface of 25,
By operating this ventilation fan 26, the drying chamber
A part of the air inside 10 is exhausted to the outside through an exhaust duct (not shown) from the opening formed in the side wall surface of the casing 25 to ventilate the inside of the drying chamber 10.

On the inner wall surface communicating with the suction port 21 of the casing 25, a temperature sensor (room temperature detection means) 27 for detecting the air temperature in the drying chamber 10 and a humidity sensor (humidity detection for detecting relative humidity in the air). Means) 28.

The drying operation with the above-mentioned device is basically a circulation fan.
While operating 24, by circulating the refrigerant discharged from the compressor of the outdoor unit 1 from the drying heat exchanger 23 to the outdoor heat exchanger, the drying heat exchanger 23 acts as a condenser, This is done by raising the air temperature in the drying chamber 10 to the set temperature by the heat of condensation. At this time, the ventilation fan 26 is also operated at the same time, so that a part of the heated air is discharged from the drying chamber 10 to the outside and the same amount of air as the discharged amount is newly introduced into the drying chamber 10. Be seen. By heating the air flowing into the drying chamber 10 to a set temperature, the allowable amount of moisture contained in the air is increased, and heated air containing a large amount of moisture evaporated from clothes is sequentially exposed to the outside. By discharging it, it is dried.

By the way, in the above embodiment, while performing the above-described drying operation more economically, the set temperature is automatically set according to the detection values of the temperature sensor 27 and the humidity sensor 28 so that the drying time can be made substantially constant. The drying operation control device 13 is provided with a control function and the like that are determined in succession, and the following control will be described with reference to the control flowcharts of FIGS. 5 to 7.

When the user turns on the dry operation switch of the remote controller 12 for dry operation, first the dry operation indicator provided on the remote controller 12 or the operation panel (not shown) of the entire heat pump system installed in the kitchen, etc. The lamp is turned on (step S1) and the operation of the ventilation fan 26 is started (step S2). Next, in step S3, it is determined whether or not the shortening operation is selected by the user, that is, whether or not the shortening operation switch is also turned on when the drying operation switch (fixed temperature fixed operation selection switch) is turned on. Here, the processing in and after step S4 when the shortened operation (fixed temperature fixed operation) is not selected will be described first.

In step S4, the time counting operation of the drying timer is started. In this drying timer, a required drying time in a standard operation mode described below is preset for a standard amount of clothes or the like to be dried. When the amount of dry clothes is significantly different, the user can appropriately change the initial setting value. The next step S5 is a step of waiting for a preset time t1 (for example, 10 minutes) to elapse, and during this time, the ventilation in the drying chamber 10 proceeds only by operating the ventilation fan 26. The purpose of this ventilation operation will be described later. After the lapse of t1 time, as shown in step S6, the room temperature T0 in the drying chamber 10 detected by the temperature sensor 27 and the humidity W0 detected by the humidity sensor 28 are read. Next, in steps S7 and S8, the detected room temperature T0 and the detected humidity W0 are compared with preset temperature T1 (for example, 25 ° C.) and humidity W1 (for example, 60%), and T0 is higher than T1, and
Except when W0 is lower than W1, that is, when the temperature is high or low, the operation moves to the warm air blowing / drying operation of step S9 and thereafter.

In this warm air blowing drying operation, the drying heat exchanger 23 acts as a condenser, and the heat of condensation heats the air circulating in the drying unit 9 to raise the temperature in the drying chamber 10. However, in order to make the drying time by this operation substantially constant, it is necessary to change the target heating temperature, that is, the set temperature Ts, according to the air condition before heating. Although a moist air diagram is schematically shown in FIG. 4, the air flowing into the drying chamber 10 has a temperature of Ta ° C. and a relative humidity of 40% as indicated by point A in FIG. When the air is heated to a temperature of Tm ℃,
The drying speed of clothes and the like hung in 10 is approximately proportional to the difference ΔQ in absolute water content between point A where the relative humidity is 100% at temperature Tm ° C. and point A above. That is, when the inflow air temperature state changes, the heating time is changed so that the above ΔQ is substantially constant, so that the drying time becomes substantially the same. For example, as shown in the point B, the relative humidity of the inflowing air is almost the same as that of the point A, but when the temperature is high, the heating temperature is higher than the temperature Tm ° C.
It is possible to obtain substantially the same ΔQ when the temperature is set to ° C. Further, even if the temperatures are the same, as indicated by point C, even when the relative humidity is high, it is necessary to set the heating temperature to Tp ° C which is higher than Tm ° C.

By changing the heating target set temperature in accordance with changes in the temperature and humidity of the inflowing air as described above, it is possible to make the drying time substantially constant. Therefore, the temperature sensors 27 that detect the humidity together with the temperature, respectively. Although the humidity sensor 28 and the humidity sensor 28 are provided at the suction port 21 of the drying unit 9, immediately after the drying operation switch is turned on, the humidity sensor 28
Then, there is a possibility that a humidity different from that of the air flowing into the drying chamber 10 may be detected during the warm air blowing drying operation. That is, when the above-mentioned drying operation switch is turned on, wet clothes are brought into the drying chamber 10, whereby air having a higher relative humidity is retained. Therefore, in step S5, the ventilation operation for t1 hours is performed, and as a result of the continuation of this ventilation operation, the air staying in the drying chamber 10 up to that time is discharged to the outside, and in the drying chamber 10 during the warm air drying operation described later. It will be replaced with the same air condition as the air flowing into the. Then, the room temperature T0 and the humidity W0 detected in this new air state are read in step S6.

In order to determine the set temperature Ts based on the above T0 and W0, first, in step S9 of FIG. 5, the humidity correction of T0 is performed. In other words, the correction temperature T01 is T01 = T0 + Ai However, when W0 ≧ 80% Ai = 2 ° C. 60% ≦ W0 <80% Ai = 1 ° C. 50% ≦ W0 <80% Ai = 0 W0 <50% At that time, Ai = -1 ° C is obtained, and the change according to the level of humidity is made by first correcting the detected temperature. Next, in step S10, the set temperature Ts is determined from the corrected temperature T01 based on the following calculation formula. That is, Ts = Tsh when T01 ≧ Th Ts = Tsd when T01 <Td Ts = T01 × Ai + Tm when Td ≦ T01 <Th However, Th = 20 ° C., Tsh = 42 ° C., Td = 8 ° C., Tsd = 30 ℃, Ai
= 1, Tm = 22 ° C.

Set temperature based on detected temperature T0 and detected temperature W0 as described above
After determining Ts, the process proceeds to step S11 in FIG.

Step S11 is a step of starting the operation of the circulation fan 24, whereby the air in the drying chamber 10 circulates in the drying unit 9 and a part of it is exhausted to the outside by the ventilation fan 26, Ventilation is also performed at the same time. Steps S12 to S16 are processing steps for performing the warm air blowing drying operation. That is, in step S12, thereafter, the room temperature Ti in the drying chamber 10 detected by the temperature sensor 27 is sequentially read, and the difference between the set temperature Ts and the detected room temperature Ti is obtained as a deviation ΔT (step S13 ),
Next, the deviation ΔT signal and the heating operation request signal are sent to the heat pump operation control device provided in the outdoor unit 1.
Send to 11 (step S14). As a result, by the heat pump operation control device 11, as described above, the heating operation for raising the air temperature in the drying chamber 10 to the set temperature Ts by the heat of condensation when the drying heat exchanger 23 acts as a condenser. Is started. Note that step S15 is a step of determining the presence or absence of mode butting. For example, during an indoor cooling operation that requires the outdoor heat exchanger to act as a condenser, the warm air blowing / drying operation cannot be performed at the same time. At this time, the indoor cooling operation is prioritized, and the operation standby signal is output from the heat pump operation control device 11 to the drying operation control device 13. As a result, the process proceeds from step S15 to S17, the time counting operation of the drying timer is interrupted, and the release of the mode butting state is waited for in step S18. Then, when the mode butting is released, step S19
In, the time measurement operation of the drying timer is restarted, the above steps S12 to S16 are repeated, and the warm air blowing / drying operation is continued. As shown in step S16, this operation is configured to end with the remaining time of the drying timer set to a preset time t2 (for example, 10 minutes). That is, the initial setting time of the drying timer is set as the time at which the drying of the clothes or the like can be completed t2 hours before the end. After that, the process proceeds from step S16 to step S20 in FIG.
A heating operation stop signal is transmitted to, and thereby the warm air blowing drying operation for circulating the refrigerant in the drying heat exchanger 23 is stopped.

Next, steps S21 to S32 are processing steps at the end of the drying operation for lowering the temperature in the drying chamber 10. That is, by the above-mentioned warm air blowing drying operation, the inside of the drying chamber 10 is in a high temperature state, for example, exceeding 30 ° C.,
As a result, the user who enters the room for taking in clothes after the drying operation is uncomfortable will feel uncomfortable.
Therefore, it is decided to reduce the temperature in order to eliminate such discomfort at the time of intake, and when doing this, based on the detected room temperature T0 immediately after the ventilation operation performed at the start of the drying operation, the ventilation operation and The cooling operation by the heat pump cycle is automatically switched. That is, when the above T0 is low, it is possible to rapidly lower the temperature with the low temperature air newly flowing into the drying chamber 10 by continuing the ventilation operation, and at this time, the ventilation operation in which only the ventilation fan 26 is operated. Select and do. On the other hand, when T0 is high, the temperature cannot be rapidly lowered in the ventilation operation, so the cooling operation by the heat pump cycle is selected. That is, in step S21, the above T0 is compared with a preset temperature T2 (for example, 10 ° C.), and if T0 is lower than this T2, step S22
Then, the circulation fan 24 is stopped, and the ventilation operation is performed in which only the ventilation fan 26 is operated. Then, in step S23, the ventilation operation is continued until the drying timer becomes 0, and the temperature inside the drying chamber 10 is lowered. Then step S24
Then, the ventilation fan 26 is stopped, and the drying operation is completed. On the other hand, when T0 is T2 or more, steps S21 to S
25, and the ventilation fan 26 is stopped. Next, Tsc preset to the target set temperature Ts for cooling operation (for example, 15
(° C) is set (step S26), and thereafter, the detected room temperature Ti is read (step S27), the deviation ΔT is calculated (step S28), and the cooling operation request signal and the above are approximately the same as in the warm air blowing / drying operation described above. Heat pump operation controller 11 with ΔT signal
(Step S29) is repeated until the remaining time of the drying timer reaches 0 in step S30. The drying heat exchanger 23 performs a cooling motion that acts as an evaporator. Then, when the remaining time of the drying timer becomes 0, the cooling operation stop signal is transmitted to the heat pump operation control device 11 (step S31), so that the circulation of the refrigerant to the drying heat exchanger 23 is stopped, and in step S32. The cooling operation is stopped by stopping the circulation fan 24. Finally, in step S33, the drying operation display lamp is turned off to end the control of the drying operation.

The control in the standard motion mode for automatically determining the heating target set temperature Ts according to the temperature T0 and the humidity W0 in the drying chamber 10 and raising the temperature in the drying chamber 10 to this Ts has been described above. ,
In the above-described embodiment, there is a function of switching to a drying operation that can further improve the economy depending on the state of the air flowing into the drying chamber 10 and an operation that can shorten the drying time depending on the user's selection. First, the shortening operation is performed by the user turning on the shortening operation switch provided on the drying operation operation remote controller 12 and then turning on the drying operation switch, thereby shifting from step S3 to step S40 in FIG. Be seen. As a result of shifting to step S40, step S
As shown by 43, the heating target set temperature Ts is uniformly set to the heating upper limit temperature Tsh (for example, 42 ° C.) in the heat pump system. Then, at this Tsh, the drying operation of step S10 and subsequent steps described above is performed to raise the temperature in the drying chamber 10.
Therefore, as compared with the standard operation mode in which the temperature is set to the temperature below Tsh, it is possible to complete the drying in a shorter time in this shortened operation. Note that the step
In S40, the room temperature T0 in the drying chamber 10 is immediately read without performing the ventilation operation for the t1 hour, and then in step S41.
In the above, for the magnitude of the difference between the set temperature Ts automatically determined in the standard operation mode based on this T0 and the Tsh, a correction for subtracting the shortened time stored in advance from the initial value of the drying timer is performed. Then, the time counting operation of the timer is started (step S42). Therefore, at this time, the previous t1
The warm air blowing / drying operation of step S11 and thereafter is immediately started without performing the ventilation operation of time.

Next, a description will be given of a drying operation that can further improve economic efficiency according to the state of air flowing into the drying chamber 10.

This is the room temperature detected in steps S7 and S8 of FIG.
T0 is higher than T1 (eg 25 ℃), and the detected temperature W0 is W1
It is the operation that is automatically selected when the temperature is low and the temperature is low (for example, 60%). At this time,
The process moves from step S8 to step S23 in FIG.
As a result, the drying operation in which only the ventilation fan 26 is operated is performed until the remaining time of the drying timer becomes zero. That is, when the air flowing into the drying chamber 10 by the ventilation operation has high temperature and low humidity, this air itself can contain a large amount of evaporated water, that is, it has a large drying capacity. Therefore, the clothes can be dried relatively quickly without further heating. Therefore, when the inflowing air condition is within the preset range as described above,
It is designed to automatically select the dry operation using only ventilation. As a result, it is possible to reduce the operating cost as compared with the case where the heating operation by the heat pump system is uniformly used together in the past.

The above embodiment is not intended to limit the present invention, and various modifications can be made within the scope of the present invention. For example, in the above embodiment, the ventilation fan 26 is provided integrally with the drying unit 9. , A ventilation fan is separately attached to the side wall surface of the drying chamber, and the humidity sensor is not provided inside the drying unit 9 so that the ventilation operation for t1 hours at the start of the operation can be omitted. It is also possible to adopt a configuration in which it is arranged at a location.

Further, in the above, the configuration is such that the operation is terminated by the drying timer, but it is also possible to adopt a configuration in which the operation is stopped by determining the end of drying from the tendency of the detection level of the humidity sensor to decrease. Also, by automatically changing the heating target set temperature based on the state of the air flowing into the drying chamber and controlling the drying time to be substantially constant, the user can predict the drying end time in advance, The comfort of use is improved.

Further, in the above embodiment, the first set temperature changing means 31 is moved to step S10 in the control flow chart of FIGS. 5 to 7, the second set temperature changing means 32 is moved to step S9, and steps S3 to S40 are executed. The fixed room temperature setting means 33 in the processing steps up to S43, the end fan control means 34 in steps S22 to S24, the end cooling operation control means 35 in steps S25 to S35, and the end operation control means 36 in steps S21 to S32. Then, and in step S7, S8, S23 is configured a low-humidity operation control means 37, respectively, and has a device configuration having all the control means 31 to 37, but a configuration provided by selecting each means as necessary. can do.

(Effect of the invention) As described above, in the heat pump type drying apparatus according to the first aspect of the present invention, by automatically changing the heating target set temperature according to the temperature of the air flowing into the drying chamber,
It is possible to make the drying time substantially constant, and for example, it becomes possible to eliminate the need for the user to change the initial value of the drying timer for each seasonal change, so that the comfort of use can be improved. At the same time, it becomes easier to match the end time of the timer and the end time of drying more accurately than before, and as a result, operating costs can be reduced. Moreover, in the heat pump type drying device, the ventilation operation and the cooling operation by the heat pump system are automatically selected according to the temperature of the air flowing into the drying chamber. In addition, the room temperature can be rapidly lowered, and unnecessary operation of the heat pump system can be suppressed, so that the comfort at the time of loading can be provided with less operating cost.

Further, as in the heat pump type drying device according to the second aspect, by controlling the heating target set temperature even in accordance with the humidity of the air flowing into the drying chamber, it is possible to control the operation so that the drying time becomes constant more accurately. This makes it possible to further improve the comfort of use and reduce operating costs.

Further, in the case where the heat pump type drying apparatus according to the third aspect is configured such that the drying operation in which the heating upper limit temperature in the heat pump system is the set temperature can be selected, the shortened drying is performed in accordance with the user's request. It is also possible to do this, which also improves the comfort of use.

Furthermore, in the heat pump type drying device according to the fourth aspect, it is determined that the state of the air flowing into the drying chamber has sufficient drying capacity, and at this time, only the ventilation fan is dried. Therefore, unnecessary heat pump heating operation can be suppressed, and the operating cost can be further reduced.

[Brief description of drawings]

FIG. 1 is a functional block diagram of a heat pump type drying apparatus of the present invention, FIG. 2 is a schematic diagram showing an overall configuration of a heat pump system configured by applying the present invention, and FIG. 3 is a perspective view of a drying unit in the heat pump system. FIG. 4 and FIG. 4 are moist air diagrams for explaining the factors that influence the drying time, and FIGS. 5, 6, and 7 are control flowcharts of the drying operation in the heat pump system. 10 ... Drying chamber, 13 ... Drying operation control device (operation control means), 15 ... Heat source side heat converter, 16 ... Compressor, 23 ... Drying heat exchanger, 26 ... Ventilation fan, 27 ...... Temperature sensor (room temperature detecting means), 28 ...... Humidity sensor (humidity detecting means), 31 ...... First set temperature changing means, 32 ...... Second set temperature changing means, 33 ...... Fixed room temperature setting means, 34 ...... End fan control means, 35 …… End cooling operation control means, 36 ……
End operation control means, 37 ... Operation control means at low humidity.

Front Page Continuation (72) Keiya Sato, Keiya Sato, 1000 Otani, Okamoto Town, Kusatsu City, Shiga Prefecture Daikin Industry Co., Ltd. Shiga Works (72) Inventor, Takayuki Sugimoto, 1000, Otani, Okamoto Town, Kusatsu City, Shiga Prefecture Daikin Industry Co., Ltd. Shiga Works (56) References JP 60-30985 (JP, A) JP 59-26867 (JP, B2) JP 60-17673 (JP, Y2)

Claims (4)

[Claims] 1. A refrigerant circulation circuit is constructed by connecting a drying heat exchanger (23) and a heat source side heat exchanger (15) arranged in a drying chamber (10) to a compressor (16). , Above drying room (10)
A ventilation fan (26) for discharging the air of the room is provided, and a room temperature detecting means (27) for detecting the room temperature of the drying room (10) is provided, and the ventilation fan (26) is operated during the drying operation. However, the operation control means (1) for controlling the heat pump heating operation so that the drying heat exchanger (23) acts as a condenser to bring the indoor temperature close to the set temperature.
In the heat pump type drying device provided with 3), the operation control means (13) changes the set temperature in the same direction as the high and low temperature direction according to the high and low temperature state of the detected temperature at the start of operation. The first set temperature changing means (31) and the detected room temperature at the start of operation are equal to or lower than the reference value, only the ventilation fan (26) is operated after the completion of the drying operation, while the detected room temperature exceeds the reference value. When it exceeds, it has an end operation control means (36) for performing an end operation for switching the refrigerant circulation in which the drying heat exchanger (23) acts as an evaporator after the completion of the drying operation to lower the indoor temperature. The heat pump type drying device characterized in that 2. A humidity detecting means (28) for detecting the humidity in the air is further provided, and the set temperature is changed in the same direction as the high and low humidity direction according to the detected humidity at the start of operation. Set the temperature change means (32) to the operation control means (1
3) The heat pump type drying device according to claim 1, characterized in that it has. 3. A set temperature fixed operation selection switch is provided, and when the set temperature fixed operation is selected, the first or second operation is performed.
The first feature is that the operation control means (13) has a fixed room temperature setting means (33) for setting the temperature near the upper limit of the setting range by the setting temperature changing means (31) (32) as the setting temperature. The heat pump type drying device according to claim 2. 4. The detected temperature at the start of operation is equal to or higher than the reference room temperature,
When the detected humidity is lower than the reference humidity, the operation control means (13) has a low humidity operation control means (37) for operating only the ventilation fan (26) to perform a dry operation. The heat pump type drying device according to claim 2.